fs/reiserfs/journal.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Write ahead logging implementation copyright Chris Mason 2000
   4  *
   5  * The background commits make this code very interrelated, and
   6  * overly complex.  I need to rethink things a bit....The major players:
   7  *
   8  * journal_begin -- call with the number of blocks you expect to log.
   9  *                  If the current transaction is too
  10  *                  old, it will block until the current transaction is
  11  *                  finished, and then start a new one.
  12  *                  Usually, your transaction will get joined in with
  13  *                  previous ones for speed.
  14  *
  15  * journal_join  -- same as journal_begin, but won't block on the current
  16  *                  transaction regardless of age.  Don't ever call
  17  *                  this.  Ever.  There are only two places it should be
  18  *                  called from, and they are both inside this file.
  19  *
  20  * journal_mark_dirty -- adds blocks into this transaction.  clears any flags
  21  *                       that might make them get sent to disk
  22  *                       and then marks them BH_JDirty.  Puts the buffer head
  23  *                       into the current transaction hash.
  24  *
  25  * journal_end -- if the current transaction is batchable, it does nothing
  26  *                   otherwise, it could do an async/synchronous commit, or
  27  *                   a full flush of all log and real blocks in the
  28  *                   transaction.
  29  *
  30  * flush_old_commits -- if the current transaction is too old, it is ended and
  31  *                      commit blocks are sent to disk.  Forces commit blocks
  32  *                      to disk for all backgrounded commits that have been
  33  *                      around too long.
  34  *                   -- Note, if you call this as an immediate flush from
  35  *                      within kupdate, it will ignore the immediate flag
  36  */
  37
  38 #include <linux/time.h>
  39 #include <linux/semaphore.h>
  40 #include <linux/vmalloc.h>
  41 #include "reiserfs.h"
  42 #include <linux/kernel.h>
  43 #include <linux/errno.h>
  44 #include <linux/fcntl.h>
  45 #include <linux/stat.h>
  46 #include <linux/string.h>
  47 #include <linux/buffer_head.h>
  48 #include <linux/workqueue.h>
  49 #include <linux/writeback.h>
  50 #include <linux/blkdev.h>
  51 #include <linux/backing-dev.h>
  52 #include <linux/uaccess.h>
  53 #include <linux/slab.h>
  54
  55
  56 /* gets a struct reiserfs_journal_list * from a list head */
  57 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
  58                                j_list))
  59
  60 /* must be correct to keep the desc and commit structs at 4k */
  61 #define JOURNAL_TRANS_HALF 1018
  62 #define BUFNR 64                /*read ahead */
  63
  64 /* cnode stat bits.  Move these into reiserfs_fs.h */
  65
  66 /* this block was freed, and can't be written.  */
  67 #define BLOCK_FREED 2
  68 /* this block was freed during this transaction, and can't be written */
  69 #define BLOCK_FREED_HOLDER 3
  70
  71 /* used in flush_journal_list */
  72 #define BLOCK_NEEDS_FLUSH 4
  73 #define BLOCK_DIRTIED 5
  74
  75 /* journal list state bits */
  76 #define LIST_TOUCHED 1
  77 #define LIST_DIRTY   2
  78 #define LIST_COMMIT_PENDING  4  /* someone will commit this list */
  79
  80 /* flags for do_journal_end */
  81 #define FLUSH_ALL   1           /* flush commit and real blocks */
  82 #define COMMIT_NOW  2           /* end and commit this transaction */
  83 #define WAIT        4           /* wait for the log blocks to hit the disk */
  84
  85 static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
  86 static int flush_journal_list(struct super_block *s,
  87                               struct reiserfs_journal_list *jl, int flushall);
  88 static int flush_commit_list(struct super_block *s,
  89                              struct reiserfs_journal_list *jl, int flushall);
  90 static int can_dirty(struct reiserfs_journal_cnode *cn);
  91 static int journal_join(struct reiserfs_transaction_handle *th,
  92                         struct super_block *sb);
  93 static void release_journal_dev(struct super_block *super,
  94                                struct reiserfs_journal *journal);
  95 static void dirty_one_transaction(struct super_block *s,
  96                                  struct reiserfs_journal_list *jl);
  97 static void flush_async_commits(struct work_struct *work);
  98 static void queue_log_writer(struct super_block *s);
  99
 100 /* values for join in do_journal_begin_r */
 101 enum {
 102         JBEGIN_REG = 0,         /* regular journal begin */
 103         /* join the running transaction if at all possible */
 104         JBEGIN_JOIN = 1,
 105         /* called from cleanup code, ignores aborted flag */
 106         JBEGIN_ABORT = 2,
 107 };
 108
 109 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
 110                               struct super_block *sb,
 111                               unsigned long nblocks, int join);
 112
 113 static void init_journal_hash(struct super_block *sb)
 114 {
 115         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 116         memset(journal->j_hash_table, 0,
 117                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
 118 }
 119
 120 /*
 121  * clears BH_Dirty and sticks the buffer on the clean list.  Called because
 122  * I can't allow refile_buffer to make schedule happen after I've freed a
 123  * block.  Look at remove_from_transaction and journal_mark_freed for
 124  * more details.
 125  */
 126 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
 127 {
 128         if (bh) {
 129                 clear_buffer_dirty(bh);
 130                 clear_buffer_journal_test(bh);
 131         }
 132         return 0;
 133 }
 134
 135 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
 136                                                          *sb)
 137 {
 138         struct reiserfs_bitmap_node *bn;
 139         static int id;
 140
 141         bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
 142         if (!bn) {
 143                 return NULL;
 144         }
 145         bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
 146         if (!bn->data) {
 147                 kfree(bn);
 148                 return NULL;
 149         }
 150         bn->id = id++;
 151         INIT_LIST_HEAD(&bn->list);
 152         return bn;
 153 }
 154
 155 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
 156 {
 157         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 158         struct reiserfs_bitmap_node *bn = NULL;
 159         struct list_head *entry = journal->j_bitmap_nodes.next;
 160
 161         journal->j_used_bitmap_nodes++;
 162 repeat:
 163
 164         if (entry != &journal->j_bitmap_nodes) {
 165                 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
 166                 list_del(entry);
 167                 memset(bn->data, 0, sb->s_blocksize);
 168                 journal->j_free_bitmap_nodes--;
 169                 return bn;
 170         }
 171         bn = allocate_bitmap_node(sb);
 172         if (!bn) {
 173                 yield();
 174                 goto repeat;
 175         }
 176         return bn;
 177 }
 178 static inline void free_bitmap_node(struct super_block *sb,
 179                                     struct reiserfs_bitmap_node *bn)
 180 {
 181         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 182         journal->j_used_bitmap_nodes--;
 183         if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
 184                 kfree(bn->data);
 185                 kfree(bn);
 186         } else {
 187                 list_add(&bn->list, &journal->j_bitmap_nodes);
 188                 journal->j_free_bitmap_nodes++;
 189         }
 190 }
 191
 192 static void allocate_bitmap_nodes(struct super_block *sb)
 193 {
 194         int i;
 195         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 196         struct reiserfs_bitmap_node *bn = NULL;
 197         for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
 198                 bn = allocate_bitmap_node(sb);
 199                 if (bn) {
 200                         list_add(&bn->list, &journal->j_bitmap_nodes);
 201                         journal->j_free_bitmap_nodes++;
 202                 } else {
 203                         /* this is ok, we'll try again when more are needed */
 204                         break;
 205                 }
 206         }
 207 }
 208
 209 static int set_bit_in_list_bitmap(struct super_block *sb,
 210                                   b_blocknr_t block,
 211                                   struct reiserfs_list_bitmap *jb)
 212 {
 213         unsigned int bmap_nr = block / (sb->s_blocksize << 3);
 214         unsigned int bit_nr = block % (sb->s_blocksize << 3);
 215
 216         if (!jb->bitmaps[bmap_nr]) {
 217                 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
 218         }
 219         set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
 220         return 0;
 221 }
 222
 223 static void cleanup_bitmap_list(struct super_block *sb,
 224                                 struct reiserfs_list_bitmap *jb)
 225 {
 226         int i;
 227         if (jb->bitmaps == NULL)
 228                 return;
 229
 230         for (i = 0; i < reiserfs_bmap_count(sb); i++) {
 231                 if (jb->bitmaps[i]) {
 232                         free_bitmap_node(sb, jb->bitmaps[i]);
 233                         jb->bitmaps[i] = NULL;
 234                 }
 235         }
 236 }
 237
 238 /*
 239  * only call this on FS unmount.
 240  */
 241 static int free_list_bitmaps(struct super_block *sb,
 242                              struct reiserfs_list_bitmap *jb_array)
 243 {
 244         int i;
 245         struct reiserfs_list_bitmap *jb;
 246         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 247                 jb = jb_array + i;
 248                 jb->journal_list = NULL;
 249                 cleanup_bitmap_list(sb, jb);
 250                 vfree(jb->bitmaps);
 251                 jb->bitmaps = NULL;
 252         }
 253         return 0;
 254 }
 255
 256 static int free_bitmap_nodes(struct super_block *sb)
 257 {
 258         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 259         struct list_head *next = journal->j_bitmap_nodes.next;
 260         struct reiserfs_bitmap_node *bn;
 261
 262         while (next != &journal->j_bitmap_nodes) {
 263                 bn = list_entry(next, struct reiserfs_bitmap_node, list);
 264                 list_del(next);
 265                 kfree(bn->data);
 266                 kfree(bn);
 267                 next = journal->j_bitmap_nodes.next;
 268                 journal->j_free_bitmap_nodes--;
 269         }
 270
 271         return 0;
 272 }
 273
 274 /*
 275  * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
 276  * jb_array is the array to be filled in.
 277  */
 278 int reiserfs_allocate_list_bitmaps(struct super_block *sb,
 279                                    struct reiserfs_list_bitmap *jb_array,
 280                                    unsigned int bmap_nr)
 281 {
 282         int i;
 283         int failed = 0;
 284         struct reiserfs_list_bitmap *jb;
 285         int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
 286
 287         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 288                 jb = jb_array + i;
 289                 jb->journal_list = NULL;
 290                 jb->bitmaps = vzalloc(mem);
 291                 if (!jb->bitmaps) {
 292                         reiserfs_warning(sb, "clm-2000", "unable to "
 293                                          "allocate bitmaps for journal lists");
 294                         failed = 1;
 295                         break;
 296                 }
 297         }
 298         if (failed) {
 299                 free_list_bitmaps(sb, jb_array);
 300                 return -1;
 301         }
 302         return 0;
 303 }
 304
 305 /*
 306  * find an available list bitmap.  If you can't find one, flush a commit list
 307  * and try again
 308  */
 309 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
 310                                                     struct reiserfs_journal_list
 311                                                     *jl)
 312 {
 313         int i, j;
 314         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 315         struct reiserfs_list_bitmap *jb = NULL;
 316
 317         for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
 318                 i = journal->j_list_bitmap_index;
 319                 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
 320                 jb = journal->j_list_bitmap + i;
 321                 if (journal->j_list_bitmap[i].journal_list) {
 322                         flush_commit_list(sb,
 323                                           journal->j_list_bitmap[i].
 324                                           journal_list, 1);
 325                         if (!journal->j_list_bitmap[i].journal_list) {
 326                                 break;
 327                         }
 328                 } else {
 329                         break;
 330                 }
 331         }
 332         /* double check to make sure if flushed correctly */
 333         if (jb->journal_list)
 334                 return NULL;
 335         jb->journal_list = jl;
 336         return jb;
 337 }
 338
 339 /*
 340  * allocates a new chunk of X nodes, and links them all together as a list.
 341  * Uses the cnode->next and cnode->prev pointers
 342  * returns NULL on failure
 343  */
 344 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
 345 {
 346         struct reiserfs_journal_cnode *head;
 347         int i;
 348         if (num_cnodes <= 0) {
 349                 return NULL;
 350         }
 351         head = vzalloc(array_size(num_cnodes,
 352                                   sizeof(struct reiserfs_journal_cnode)));
 353         if (!head) {
 354                 return NULL;
 355         }
 356         head[0].prev = NULL;
 357         head[0].next = head + 1;
 358         for (i = 1; i < num_cnodes; i++) {
 359                 head[i].prev = head + (i - 1);
 360                 head[i].next = head + (i + 1);  /* if last one, overwrite it after the if */
 361         }
 362         head[num_cnodes - 1].next = NULL;
 363         return head;
 364 }
 365
 366 /* pulls a cnode off the free list, or returns NULL on failure */
 367 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
 368 {
 369         struct reiserfs_journal_cnode *cn;
 370         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 371
 372         reiserfs_check_lock_depth(sb, "get_cnode");
 373
 374         if (journal->j_cnode_free <= 0) {
 375                 return NULL;
 376         }
 377         journal->j_cnode_used++;
 378         journal->j_cnode_free--;
 379         cn = journal->j_cnode_free_list;
 380         if (!cn) {
 381                 return cn;
 382         }
 383         if (cn->next) {
 384                 cn->next->prev = NULL;
 385         }
 386         journal->j_cnode_free_list = cn->next;
 387         memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
 388         return cn;
 389 }
 390
 391 /*
 392  * returns a cnode to the free list
 393  */
 394 static void free_cnode(struct super_block *sb,
 395                        struct reiserfs_journal_cnode *cn)
 396 {
 397         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 398
 399         reiserfs_check_lock_depth(sb, "free_cnode");
 400
 401         journal->j_cnode_used--;
 402         journal->j_cnode_free++;
 403         /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
 404         cn->next = journal->j_cnode_free_list;
 405         if (journal->j_cnode_free_list) {
 406                 journal->j_cnode_free_list->prev = cn;
 407         }
 408         cn->prev = NULL;        /* not needed with the memset, but I might kill the memset, and forget to do this */
 409         journal->j_cnode_free_list = cn;
 410 }
 411
 412 static void clear_prepared_bits(struct buffer_head *bh)
 413 {
 414         clear_buffer_journal_prepared(bh);
 415         clear_buffer_journal_restore_dirty(bh);
 416 }
 417
 418 /*
 419  * return a cnode with same dev, block number and size in table,
 420  * or null if not found
 421  */
 422 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
 423                                                                   super_block
 424                                                                   *sb,
 425                                                                   struct
 426                                                                   reiserfs_journal_cnode
 427                                                                   **table,
 428                                                                   long bl)
 429 {
 430         struct reiserfs_journal_cnode *cn;
 431         cn = journal_hash(table, sb, bl);
 432         while (cn) {
 433                 if (cn->blocknr == bl && cn->sb == sb)
 434                         return cn;
 435                 cn = cn->hnext;
 436         }
 437         return (struct reiserfs_journal_cnode *)0;
 438 }
 439
 440 /*
 441  * this actually means 'can this block be reallocated yet?'.  If you set
 442  * search_all, a block can only be allocated if it is not in the current
 443  * transaction, was not freed by the current transaction, and has no chance
 444  * of ever being overwritten by a replay after crashing.
 445  *
 446  * If you don't set search_all, a block can only be allocated if it is not
 447  * in the current transaction.  Since deleting a block removes it from the
 448  * current transaction, this case should never happen.  If you don't set
 449  * search_all, make sure you never write the block without logging it.
 450  *
 451  * next_zero_bit is a suggestion about the next block to try for find_forward.
 452  * when bl is rejected because it is set in a journal list bitmap, we search
 453  * for the next zero bit in the bitmap that rejected bl.  Then, we return
 454  * that through next_zero_bit for find_forward to try.
 455  *
 456  * Just because we return something in next_zero_bit does not mean we won't
 457  * reject it on the next call to reiserfs_in_journal
 458  */
 459 int reiserfs_in_journal(struct super_block *sb,
 460                         unsigned int bmap_nr, int bit_nr, int search_all,
 461                         b_blocknr_t * next_zero_bit)
 462 {
 463         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 464         struct reiserfs_list_bitmap *jb;
 465         int i;
 466         unsigned long bl;
 467
 468         *next_zero_bit = 0;     /* always start this at zero. */
 469
 470         PROC_INFO_INC(sb, journal.in_journal);
 471         /*
 472          * If we aren't doing a search_all, this is a metablock, and it
 473          * will be logged before use.  if we crash before the transaction
 474          * that freed it commits,  this transaction won't have committed
 475          * either, and the block will never be written
 476          */
 477         if (search_all) {
 478                 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 479                         PROC_INFO_INC(sb, journal.in_journal_bitmap);
 480                         jb = journal->j_list_bitmap + i;
 481                         if (jb->journal_list && jb->bitmaps[bmap_nr] &&
 482                             test_bit(bit_nr,
 483                                      (unsigned long *)jb->bitmaps[bmap_nr]->
 484                                      data)) {
 485                                 *next_zero_bit =
 486                                     find_next_zero_bit((unsigned long *)
 487                                                        (jb->bitmaps[bmap_nr]->
 488                                                         data),
 489                                                        sb->s_blocksize << 3,
 490                                                        bit_nr + 1);
 491                                 return 1;
 492                         }
 493                 }
 494         }
 495
 496         bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
 497         /* is it in any old transactions? */
 498         if (search_all
 499             && (get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
 500                 return 1;
 501         }
 502
 503         /* is it in the current transaction.  This should never happen */
 504         if ((get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
 505                 BUG();
 506                 return 1;
 507         }
 508
 509         PROC_INFO_INC(sb, journal.in_journal_reusable);
 510         /* safe for reuse */
 511         return 0;
 512 }
 513
 514 /* insert cn into table */
 515 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
 516                                        struct reiserfs_journal_cnode *cn)
 517 {
 518         struct reiserfs_journal_cnode *cn_orig;
 519
 520         cn_orig = journal_hash(table, cn->sb, cn->blocknr);
 521         cn->hnext = cn_orig;
 522         cn->hprev = NULL;
 523         if (cn_orig) {
 524                 cn_orig->hprev = cn;
 525         }
 526         journal_hash(table, cn->sb, cn->blocknr) = cn;
 527 }
 528
 529 /* lock the current transaction */
 530 static inline void lock_journal(struct super_block *sb)
 531 {
 532         PROC_INFO_INC(sb, journal.lock_journal);
 533
 534         reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
 535 }
 536
 537 /* unlock the current transaction */
 538 static inline void unlock_journal(struct super_block *sb)
 539 {
 540         mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
 541 }
 542
 543 static inline void get_journal_list(struct reiserfs_journal_list *jl)
 544 {
 545         jl->j_refcount++;
 546 }
 547
 548 static inline void put_journal_list(struct super_block *s,
 549                                     struct reiserfs_journal_list *jl)
 550 {
 551         if (jl->j_refcount < 1) {
 552                 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
 553                                jl->j_trans_id, jl->j_refcount);
 554         }
 555         if (--jl->j_refcount == 0)
 556                 kfree(jl);
 557 }
 558
 559 /*
 560  * this used to be much more involved, and I'm keeping it just in case
 561  * things get ugly again.  it gets called by flush_commit_list, and
 562  * cleans up any data stored about blocks freed during a transaction.
 563  */
 564 static void cleanup_freed_for_journal_list(struct super_block *sb,
 565                                            struct reiserfs_journal_list *jl)
 566 {
 567
 568         struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
 569         if (jb) {
 570                 cleanup_bitmap_list(sb, jb);
 571         }
 572         jl->j_list_bitmap->journal_list = NULL;
 573         jl->j_list_bitmap = NULL;
 574 }
 575
 576 static int journal_list_still_alive(struct super_block *s,
 577                                     unsigned int trans_id)
 578 {
 579         struct reiserfs_journal *journal = SB_JOURNAL(s);
 580         struct list_head *entry = &journal->j_journal_list;
 581         struct reiserfs_journal_list *jl;
 582
 583         if (!list_empty(entry)) {
 584                 jl = JOURNAL_LIST_ENTRY(entry->next);
 585                 if (jl->j_trans_id <= trans_id) {
 586                         return 1;
 587                 }
 588         }
 589         return 0;
 590 }
 591
 592 /*
 593  * If page->mapping was null, we failed to truncate this page for
 594  * some reason.  Most likely because it was truncated after being
 595  * logged via data=journal.
 596  *
 597  * This does a check to see if the buffer belongs to one of these
 598  * lost pages before doing the final put_bh.  If page->mapping was
 599  * null, it tries to free buffers on the page, which should make the
 600  * final put_page drop the page from the lru.
 601  */
 602 static void release_buffer_page(struct buffer_head *bh)
 603 {
 604         struct folio *folio = bh->b_folio;
 605         if (!folio->mapping && folio_trylock(folio)) {
 606                 folio_get(folio);
 607                 put_bh(bh);
 608                 if (!folio->mapping)
 609                         try_to_free_buffers(folio);
 610                 folio_unlock(folio);
 611                 folio_put(folio);
 612         } else {
 613                 put_bh(bh);
 614         }
 615 }
 616
 617 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
 618 {
 619         if (buffer_journaled(bh)) {
 620                 reiserfs_warning(NULL, "clm-2084",
 621                                  "pinned buffer %lu:%pg sent to disk",
 622                                  bh->b_blocknr, bh->b_bdev);
 623         }
 624         if (uptodate)
 625                 set_buffer_uptodate(bh);
 626         else
 627                 clear_buffer_uptodate(bh);
 628
 629         unlock_buffer(bh);
 630         release_buffer_page(bh);
 631 }
 632
 633 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
 634 {
 635         if (uptodate)
 636                 set_buffer_uptodate(bh);
 637         else
 638                 clear_buffer_uptodate(bh);
 639         unlock_buffer(bh);
 640         put_bh(bh);
 641 }
 642
 643 static void submit_logged_buffer(struct buffer_head *bh)
 644 {
 645         get_bh(bh);
 646         bh->b_end_io = reiserfs_end_buffer_io_sync;
 647         clear_buffer_journal_new(bh);
 648         clear_buffer_dirty(bh);
 649         if (!test_clear_buffer_journal_test(bh))
 650                 BUG();
 651         if (!buffer_uptodate(bh))
 652                 BUG();
 653         submit_bh(REQ_OP_WRITE, bh);
 654 }
 655
 656 static void submit_ordered_buffer(struct buffer_head *bh)
 657 {
 658         get_bh(bh);
 659         bh->b_end_io = reiserfs_end_ordered_io;
 660         clear_buffer_dirty(bh);
 661         if (!buffer_uptodate(bh))
 662                 BUG();
 663         submit_bh(REQ_OP_WRITE, bh);
 664 }
 665
 666 #define CHUNK_SIZE 32
 667 struct buffer_chunk {
 668         struct buffer_head *bh[CHUNK_SIZE];
 669         int nr;
 670 };
 671
 672 static void write_chunk(struct buffer_chunk *chunk)
 673 {
 674         int i;
 675         for (i = 0; i < chunk->nr; i++) {
 676                 submit_logged_buffer(chunk->bh[i]);
 677         }
 678         chunk->nr = 0;
 679 }
 680
 681 static void write_ordered_chunk(struct buffer_chunk *chunk)
 682 {
 683         int i;
 684         for (i = 0; i < chunk->nr; i++) {
 685                 submit_ordered_buffer(chunk->bh[i]);
 686         }
 687         chunk->nr = 0;
 688 }
 689
 690 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
 691                         spinlock_t * lock, void (fn) (struct buffer_chunk *))
 692 {
 693         int ret = 0;
 694         BUG_ON(chunk->nr >= CHUNK_SIZE);
 695         chunk->bh[chunk->nr++] = bh;
 696         if (chunk->nr >= CHUNK_SIZE) {
 697                 ret = 1;
 698                 if (lock) {
 699                         spin_unlock(lock);
 700                         fn(chunk);
 701                         spin_lock(lock);
 702                 } else {
 703                         fn(chunk);
 704                 }
 705         }
 706         return ret;
 707 }
 708
 709 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
 710 static struct reiserfs_jh *alloc_jh(void)
 711 {
 712         struct reiserfs_jh *jh;
 713         while (1) {
 714                 jh = kmalloc(sizeof(*jh), GFP_NOFS);
 715                 if (jh) {
 716                         atomic_inc(&nr_reiserfs_jh);
 717                         return jh;
 718                 }
 719                 yield();
 720         }
 721 }
 722
 723 /*
 724  * we want to free the jh when the buffer has been written
 725  * and waited on
 726  */
 727 void reiserfs_free_jh(struct buffer_head *bh)
 728 {
 729         struct reiserfs_jh *jh;
 730
 731         jh = bh->b_private;
 732         if (jh) {
 733                 bh->b_private = NULL;
 734                 jh->bh = NULL;
 735                 list_del_init(&jh->list);
 736                 kfree(jh);
 737                 if (atomic_read(&nr_reiserfs_jh) <= 0)
 738                         BUG();
 739                 atomic_dec(&nr_reiserfs_jh);
 740                 put_bh(bh);
 741         }
 742 }
 743
 744 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
 745                            int tail)
 746 {
 747         struct reiserfs_jh *jh;
 748
 749         if (bh->b_private) {
 750                 spin_lock(&j->j_dirty_buffers_lock);
 751                 if (!bh->b_private) {
 752                         spin_unlock(&j->j_dirty_buffers_lock);
 753                         goto no_jh;
 754                 }
 755                 jh = bh->b_private;
 756                 list_del_init(&jh->list);
 757         } else {
 758 no_jh:
 759                 get_bh(bh);
 760                 jh = alloc_jh();
 761                 spin_lock(&j->j_dirty_buffers_lock);
 762                 /*
 763                  * buffer must be locked for __add_jh, should be able to have
 764                  * two adds at the same time
 765                  */
 766                 BUG_ON(bh->b_private);
 767                 jh->bh = bh;
 768                 bh->b_private = jh;
 769         }
 770         jh->jl = j->j_current_jl;
 771         if (tail)
 772                 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
 773         else {
 774                 list_add_tail(&jh->list, &jh->jl->j_bh_list);
 775         }
 776         spin_unlock(&j->j_dirty_buffers_lock);
 777         return 0;
 778 }
 779
 780 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
 781 {
 782         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
 783 }
 784 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
 785 {
 786         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
 787 }
 788
 789 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
 790 static int write_ordered_buffers(spinlock_t * lock,
 791                                  struct reiserfs_journal *j,
 792                                  struct reiserfs_journal_list *jl,
 793                                  struct list_head *list)
 794 {
 795         struct buffer_head *bh;
 796         struct reiserfs_jh *jh;
 797         int ret = j->j_errno;
 798         struct buffer_chunk chunk;
 799         struct list_head tmp;
 800         INIT_LIST_HEAD(&tmp);
 801
 802         chunk.nr = 0;
 803         spin_lock(lock);
 804         while (!list_empty(list)) {
 805                 jh = JH_ENTRY(list->next);
 806                 bh = jh->bh;
 807                 get_bh(bh);
 808                 if (!trylock_buffer(bh)) {
 809                         if (!buffer_dirty(bh)) {
 810                                 list_move(&jh->list, &tmp);
 811                                 goto loop_next;
 812                         }
 813                         spin_unlock(lock);
 814                         if (chunk.nr)
 815                                 write_ordered_chunk(&chunk);
 816                         wait_on_buffer(bh);
 817                         cond_resched();
 818                         spin_lock(lock);
 819                         goto loop_next;
 820                 }
 821                 /*
 822                  * in theory, dirty non-uptodate buffers should never get here,
 823                  * but the upper layer io error paths still have a few quirks.
 824                  * Handle them here as gracefully as we can
 825                  */
 826                 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
 827                         clear_buffer_dirty(bh);
 828                         ret = -EIO;
 829                 }
 830                 if (buffer_dirty(bh)) {
 831                         list_move(&jh->list, &tmp);
 832                         add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
 833                 } else {
 834                         reiserfs_free_jh(bh);
 835                         unlock_buffer(bh);
 836                 }
 837 loop_next:
 838                 put_bh(bh);
 839                 cond_resched_lock(lock);
 840         }
 841         if (chunk.nr) {
 842                 spin_unlock(lock);
 843                 write_ordered_chunk(&chunk);
 844                 spin_lock(lock);
 845         }
 846         while (!list_empty(&tmp)) {
 847                 jh = JH_ENTRY(tmp.prev);
 848                 bh = jh->bh;
 849                 get_bh(bh);
 850                 reiserfs_free_jh(bh);
 851
 852                 if (buffer_locked(bh)) {
 853                         spin_unlock(lock);
 854                         wait_on_buffer(bh);
 855                         spin_lock(lock);
 856                 }
 857                 if (!buffer_uptodate(bh)) {
 858                         ret = -EIO;
 859                 }
 860                 /*
 861                  * ugly interaction with invalidate_folio here.
 862                  * reiserfs_invalidate_folio will pin any buffer that has a
 863                  * valid journal head from an older transaction.  If someone
 864                  * else sets our buffer dirty after we write it in the first
 865                  * loop, and then someone truncates the page away, nobody
 866                  * will ever write the buffer. We're safe if we write the
 867                  * page one last time after freeing the journal header.
 868                  */
 869                 if (buffer_dirty(bh) && unlikely(bh->b_folio->mapping == NULL)) {
 870                         spin_unlock(lock);
 871                         write_dirty_buffer(bh, 0);
 872                         spin_lock(lock);
 873                 }
 874                 put_bh(bh);
 875                 cond_resched_lock(lock);
 876         }
 877         spin_unlock(lock);
 878         return ret;
 879 }
 880
 881 static int flush_older_commits(struct super_block *s,
 882                                struct reiserfs_journal_list *jl)
 883 {
 884         struct reiserfs_journal *journal = SB_JOURNAL(s);
 885         struct reiserfs_journal_list *other_jl;
 886         struct reiserfs_journal_list *first_jl;
 887         struct list_head *entry;
 888         unsigned int trans_id = jl->j_trans_id;
 889         unsigned int other_trans_id;
 890
 891 find_first:
 892         /*
 893          * first we walk backwards to find the oldest uncommitted transation
 894          */
 895         first_jl = jl;
 896         entry = jl->j_list.prev;
 897         while (1) {
 898                 other_jl = JOURNAL_LIST_ENTRY(entry);
 899                 if (entry == &journal->j_journal_list ||
 900                     atomic_read(&other_jl->j_older_commits_done))
 901                         break;
 902
 903                 first_jl = other_jl;
 904                 entry = other_jl->j_list.prev;
 905         }
 906
 907         /* if we didn't find any older uncommitted transactions, return now */
 908         if (first_jl == jl) {
 909                 return 0;
 910         }
 911
 912         entry = &first_jl->j_list;
 913         while (1) {
 914                 other_jl = JOURNAL_LIST_ENTRY(entry);
 915                 other_trans_id = other_jl->j_trans_id;
 916
 917                 if (other_trans_id < trans_id) {
 918                         if (atomic_read(&other_jl->j_commit_left) != 0) {
 919                                 flush_commit_list(s, other_jl, 0);
 920
 921                                 /* list we were called with is gone, return */
 922                                 if (!journal_list_still_alive(s, trans_id))
 923                                         return 1;
 924
 925                                 /*
 926                                  * the one we just flushed is gone, this means
 927                                  * all older lists are also gone, so first_jl
 928                                  * is no longer valid either.  Go back to the
 929                                  * beginning.
 930                                  */
 931                                 if (!journal_list_still_alive
 932                                     (s, other_trans_id)) {
 933                                         goto find_first;
 934                                 }
 935                         }
 936                         entry = entry->next;
 937                         if (entry == &journal->j_journal_list)
 938                                 return 0;
 939                 } else {
 940                         return 0;
 941                 }
 942         }
 943         return 0;
 944 }
 945
 946 static int reiserfs_async_progress_wait(struct super_block *s)
 947 {
 948         struct reiserfs_journal *j = SB_JOURNAL(s);
 949
 950         if (atomic_read(&j->j_async_throttle)) {
 951                 int depth;
 952
 953                 depth = reiserfs_write_unlock_nested(s);
 954                 wait_var_event_timeout(&j->j_async_throttle,
 955                                        atomic_read(&j->j_async_throttle) == 0,
 956                                        HZ / 10);
 957                 reiserfs_write_lock_nested(s, depth);
 958         }
 959
 960         return 0;
 961 }
 962
 963 /*
 964  * if this journal list still has commit blocks unflushed, send them to disk.
 965  *
 966  * log areas must be flushed in order (transaction 2 can't commit before
 967  * transaction 1) Before the commit block can by written, every other log
 968  * block must be safely on disk
 969  */
 970 static int flush_commit_list(struct super_block *s,
 971                              struct reiserfs_journal_list *jl, int flushall)
 972 {
 973         int i;
 974         b_blocknr_t bn;
 975         struct buffer_head *tbh = NULL;
 976         unsigned int trans_id = jl->j_trans_id;
 977         struct reiserfs_journal *journal = SB_JOURNAL(s);
 978         int retval = 0;
 979         int write_len;
 980         int depth;
 981
 982         reiserfs_check_lock_depth(s, "flush_commit_list");
 983
 984         if (atomic_read(&jl->j_older_commits_done)) {
 985                 return 0;
 986         }
 987
 988         /*
 989          * before we can put our commit blocks on disk, we have to make
 990          * sure everyone older than us is on disk too
 991          */
 992         BUG_ON(jl->j_len <= 0);
 993         BUG_ON(trans_id == journal->j_trans_id);
 994
 995         get_journal_list(jl);
 996         if (flushall) {
 997                 if (flush_older_commits(s, jl) == 1) {
 998                         /*
 999                          * list disappeared during flush_older_commits.
1000                          * return
1001                          */
1002                         goto put_jl;
1003                 }
1004         }
1005
1006         /* make sure nobody is trying to flush this one at the same time */
1007         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1008
1009         if (!journal_list_still_alive(s, trans_id)) {
1010                 mutex_unlock(&jl->j_commit_mutex);
1011                 goto put_jl;
1012         }
1013         BUG_ON(jl->j_trans_id == 0);
1014
1015         /* this commit is done, exit */
1016         if (atomic_read(&jl->j_commit_left) <= 0) {
1017                 if (flushall) {
1018                         atomic_set(&jl->j_older_commits_done, 1);
1019                 }
1020                 mutex_unlock(&jl->j_commit_mutex);
1021                 goto put_jl;
1022         }
1023
1024         if (!list_empty(&jl->j_bh_list)) {
1025                 int ret;
1026
1027                 /*
1028                  * We might sleep in numerous places inside
1029                  * write_ordered_buffers. Relax the write lock.
1030                  */
1031                 depth = reiserfs_write_unlock_nested(s);
1032                 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1033                                             journal, jl, &jl->j_bh_list);
1034                 if (ret < 0 && retval == 0)
1035                         retval = ret;
1036                 reiserfs_write_lock_nested(s, depth);
1037         }
1038         BUG_ON(!list_empty(&jl->j_bh_list));
1039         /*
1040          * for the description block and all the log blocks, submit any buffers
1041          * that haven't already reached the disk.  Try to write at least 256
1042          * log blocks. later on, we will only wait on blocks that correspond
1043          * to this transaction, but while we're unplugging we might as well
1044          * get a chunk of data on there.
1045          */
1046         atomic_inc(&journal->j_async_throttle);
1047         write_len = jl->j_len + 1;
1048         if (write_len < 256)
1049                 write_len = 256;
1050         for (i = 0 ; i < write_len ; i++) {
1051                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1052                     SB_ONDISK_JOURNAL_SIZE(s);
1053                 tbh = journal_find_get_block(s, bn);
1054                 if (tbh) {
1055                         if (buffer_dirty(tbh)) {
1056                             depth = reiserfs_write_unlock_nested(s);
1057                             write_dirty_buffer(tbh, 0);
1058                             reiserfs_write_lock_nested(s, depth);
1059                         }
1060                         put_bh(tbh) ;
1061                 }
1062         }
1063         if (atomic_dec_and_test(&journal->j_async_throttle))
1064                 wake_up_var(&journal->j_async_throttle);
1065
1066         for (i = 0; i < (jl->j_len + 1); i++) {
1067                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1068                     (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1069                 tbh = journal_find_get_block(s, bn);
1070
1071                 depth = reiserfs_write_unlock_nested(s);
1072                 __wait_on_buffer(tbh);
1073                 reiserfs_write_lock_nested(s, depth);
1074                 /*
1075                  * since we're using ll_rw_blk above, it might have skipped
1076                  * over a locked buffer.  Double check here
1077                  */
1078                 /* redundant, sync_dirty_buffer() checks */
1079                 if (buffer_dirty(tbh)) {
1080                         depth = reiserfs_write_unlock_nested(s);
1081                         sync_dirty_buffer(tbh);
1082                         reiserfs_write_lock_nested(s, depth);
1083                 }
1084                 if (unlikely(!buffer_uptodate(tbh))) {
1085 #ifdef CONFIG_REISERFS_CHECK
1086                         reiserfs_warning(s, "journal-601",
1087                                          "buffer write failed");
1088 #endif
1089                         retval = -EIO;
1090                 }
1091                 /* once for journal_find_get_block */
1092                 put_bh(tbh);
1093                 /* once due to original getblk in do_journal_end */
1094                 put_bh(tbh);
1095                 atomic_dec(&jl->j_commit_left);
1096         }
1097
1098         BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1099
1100         /*
1101          * If there was a write error in the journal - we can't commit
1102          * this transaction - it will be invalid and, if successful,
1103          * will just end up propagating the write error out to
1104          * the file system.
1105          */
1106         if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1107                 if (buffer_dirty(jl->j_commit_bh))
1108                         BUG();
1109                 mark_buffer_dirty(jl->j_commit_bh) ;
1110                 depth = reiserfs_write_unlock_nested(s);
1111                 if (reiserfs_barrier_flush(s))
1112                         __sync_dirty_buffer(jl->j_commit_bh,
1113                                         REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1114                 else
1115                         sync_dirty_buffer(jl->j_commit_bh);
1116                 reiserfs_write_lock_nested(s, depth);
1117         }
1118
1119         /*
1120          * If there was a write error in the journal - we can't commit this
1121          * transaction - it will be invalid and, if successful, will just end
1122          * up propagating the write error out to the filesystem.
1123          */
1124         if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1125 #ifdef CONFIG_REISERFS_CHECK
1126                 reiserfs_warning(s, "journal-615", "buffer write failed");
1127 #endif
1128                 retval = -EIO;
1129         }
1130         bforget(jl->j_commit_bh);
1131         if (journal->j_last_commit_id != 0 &&
1132             (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1133                 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1134                                  journal->j_last_commit_id, jl->j_trans_id);
1135         }
1136         journal->j_last_commit_id = jl->j_trans_id;
1137
1138         /*
1139          * now, every commit block is on the disk.  It is safe to allow
1140          * blocks freed during this transaction to be reallocated
1141          */
1142         cleanup_freed_for_journal_list(s, jl);
1143
1144         retval = retval ? retval : journal->j_errno;
1145
1146         /* mark the metadata dirty */
1147         if (!retval)
1148                 dirty_one_transaction(s, jl);
1149         atomic_dec(&jl->j_commit_left);
1150
1151         if (flushall) {
1152                 atomic_set(&jl->j_older_commits_done, 1);
1153         }
1154         mutex_unlock(&jl->j_commit_mutex);
1155 put_jl:
1156         put_journal_list(s, jl);
1157
1158         if (retval)
1159                 reiserfs_abort(s, retval, "Journal write error in %s",
1160                                __func__);
1161         return retval;
1162 }
1163
1164 /*
1165  * flush_journal_list frequently needs to find a newer transaction for a
1166  * given block.  This does that, or returns NULL if it can't find anything
1167  */
1168 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1169                                                           reiserfs_journal_cnode
1170                                                           *cn)
1171 {
1172         struct super_block *sb = cn->sb;
1173         b_blocknr_t blocknr = cn->blocknr;
1174
1175         cn = cn->hprev;
1176         while (cn) {
1177                 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1178                         return cn->jlist;
1179                 }
1180                 cn = cn->hprev;
1181         }
1182         return NULL;
1183 }
1184
1185 static void remove_journal_hash(struct super_block *,
1186                                 struct reiserfs_journal_cnode **,
1187                                 struct reiserfs_journal_list *, unsigned long,
1188                                 int);
1189
1190 /*
1191  * once all the real blocks have been flushed, it is safe to remove them
1192  * from the journal list for this transaction.  Aside from freeing the
1193  * cnode, this also allows the block to be reallocated for data blocks
1194  * if it had been deleted.
1195  */
1196 static void remove_all_from_journal_list(struct super_block *sb,
1197                                          struct reiserfs_journal_list *jl,
1198                                          int debug)
1199 {
1200         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1201         struct reiserfs_journal_cnode *cn, *last;
1202         cn = jl->j_realblock;
1203
1204         /*
1205          * which is better, to lock once around the whole loop, or
1206          * to lock for each call to remove_journal_hash?
1207          */
1208         while (cn) {
1209                 if (cn->blocknr != 0) {
1210                         if (debug) {
1211                                 reiserfs_warning(sb, "reiserfs-2201",
1212                                                  "block %u, bh is %d, state %ld",
1213                                                  cn->blocknr, cn->bh ? 1 : 0,
1214                                                  cn->state);
1215                         }
1216                         cn->state = 0;
1217                         remove_journal_hash(sb, journal->j_list_hash_table,
1218                                             jl, cn->blocknr, 1);
1219                 }
1220                 last = cn;
1221                 cn = cn->next;
1222                 free_cnode(sb, last);
1223         }
1224         jl->j_realblock = NULL;
1225 }
1226
1227 /*
1228  * if this timestamp is greater than the timestamp we wrote last to the
1229  * header block, write it to the header block.  once this is done, I can
1230  * safely say the log area for this transaction won't ever be replayed,
1231  * and I can start releasing blocks in this transaction for reuse as data
1232  * blocks.  called by flush_journal_list, before it calls
1233  * remove_all_from_journal_list
1234  */
1235 static int _update_journal_header_block(struct super_block *sb,
1236                                         unsigned long offset,
1237                                         unsigned int trans_id)
1238 {
1239         struct reiserfs_journal_header *jh;
1240         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1241         int depth;
1242
1243         if (reiserfs_is_journal_aborted(journal))
1244                 return -EIO;
1245
1246         if (trans_id >= journal->j_last_flush_trans_id) {
1247                 if (buffer_locked((journal->j_header_bh))) {
1248                         depth = reiserfs_write_unlock_nested(sb);
1249                         __wait_on_buffer(journal->j_header_bh);
1250                         reiserfs_write_lock_nested(sb, depth);
1251                         if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1252 #ifdef CONFIG_REISERFS_CHECK
1253                                 reiserfs_warning(sb, "journal-699",
1254                                                  "buffer write failed");
1255 #endif
1256                                 return -EIO;
1257                         }
1258                 }
1259                 journal->j_last_flush_trans_id = trans_id;
1260                 journal->j_first_unflushed_offset = offset;
1261                 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1262                                                         b_data);
1263                 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1264                 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1265                 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1266
1267                 set_buffer_dirty(journal->j_header_bh);
1268                 depth = reiserfs_write_unlock_nested(sb);
1269
1270                 if (reiserfs_barrier_flush(sb))
1271                         __sync_dirty_buffer(journal->j_header_bh,
1272                                         REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1273                 else
1274                         sync_dirty_buffer(journal->j_header_bh);
1275
1276                 reiserfs_write_lock_nested(sb, depth);
1277                 if (!buffer_uptodate(journal->j_header_bh)) {
1278                         reiserfs_warning(sb, "journal-837",
1279                                          "IO error during journal replay");
1280                         return -EIO;
1281                 }
1282         }
1283         return 0;
1284 }
1285
1286 static int update_journal_header_block(struct super_block *sb,
1287                                        unsigned long offset,
1288                                        unsigned int trans_id)
1289 {
1290         return _update_journal_header_block(sb, offset, trans_id);
1291 }
1292
1293 /*
1294 ** flush any and all journal lists older than you are
1295 ** can only be called from flush_journal_list
1296 */
1297 static int flush_older_journal_lists(struct super_block *sb,
1298                                      struct reiserfs_journal_list *jl)
1299 {
1300         struct list_head *entry;
1301         struct reiserfs_journal_list *other_jl;
1302         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1303         unsigned int trans_id = jl->j_trans_id;
1304
1305         /*
1306          * we know we are the only ones flushing things, no extra race
1307          * protection is required.
1308          */
1309 restart:
1310         entry = journal->j_journal_list.next;
1311         /* Did we wrap? */
1312         if (entry == &journal->j_journal_list)
1313                 return 0;
1314         other_jl = JOURNAL_LIST_ENTRY(entry);
1315         if (other_jl->j_trans_id < trans_id) {
1316                 BUG_ON(other_jl->j_refcount <= 0);
1317                 /* do not flush all */
1318                 flush_journal_list(sb, other_jl, 0);
1319
1320                 /* other_jl is now deleted from the list */
1321                 goto restart;
1322         }
1323         return 0;
1324 }
1325
1326 static void del_from_work_list(struct super_block *s,
1327                                struct reiserfs_journal_list *jl)
1328 {
1329         struct reiserfs_journal *journal = SB_JOURNAL(s);
1330         if (!list_empty(&jl->j_working_list)) {
1331                 list_del_init(&jl->j_working_list);
1332                 journal->j_num_work_lists--;
1333         }
1334 }
1335
1336 /*
1337  * flush a journal list, both commit and real blocks
1338  *
1339  * always set flushall to 1, unless you are calling from inside
1340  * flush_journal_list
1341  *
1342  * IMPORTANT.  This can only be called while there are no journal writers,
1343  * and the journal is locked.  That means it can only be called from
1344  * do_journal_end, or by journal_release
1345  */
1346 static int flush_journal_list(struct super_block *s,
1347                               struct reiserfs_journal_list *jl, int flushall)
1348 {
1349         struct reiserfs_journal_list *pjl;
1350         struct reiserfs_journal_cnode *cn;
1351         int count;
1352         int was_jwait = 0;
1353         int was_dirty = 0;
1354         struct buffer_head *saved_bh;
1355         unsigned long j_len_saved = jl->j_len;
1356         struct reiserfs_journal *journal = SB_JOURNAL(s);
1357         int err = 0;
1358         int depth;
1359
1360         BUG_ON(j_len_saved <= 0);
1361
1362         if (atomic_read(&journal->j_wcount) != 0) {
1363                 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1364                                  atomic_read(&journal->j_wcount));
1365         }
1366
1367         /* if flushall == 0, the lock is already held */
1368         if (flushall) {
1369                 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1370         } else if (mutex_trylock(&journal->j_flush_mutex)) {
1371                 BUG();
1372         }
1373
1374         count = 0;
1375         if (j_len_saved > journal->j_trans_max) {
1376                 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1377                                j_len_saved, jl->j_trans_id);
1378                 return 0;
1379         }
1380
1381         /* if all the work is already done, get out of here */
1382         if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1383             atomic_read(&jl->j_commit_left) <= 0) {
1384                 goto flush_older_and_return;
1385         }
1386
1387         /*
1388          * start by putting the commit list on disk.  This will also flush
1389          * the commit lists of any olders transactions
1390          */
1391         flush_commit_list(s, jl, 1);
1392
1393         if (!(jl->j_state & LIST_DIRTY)
1394             && !reiserfs_is_journal_aborted(journal))
1395                 BUG();
1396
1397         /* are we done now? */
1398         if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1399             atomic_read(&jl->j_commit_left) <= 0) {
1400                 goto flush_older_and_return;
1401         }
1402
1403         /*
1404          * loop through each cnode, see if we need to write it,
1405          * or wait on a more recent transaction, or just ignore it
1406          */
1407         if (atomic_read(&journal->j_wcount) != 0) {
1408                 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1409                                "wcount is not 0");
1410         }
1411         cn = jl->j_realblock;
1412         while (cn) {
1413                 was_jwait = 0;
1414                 was_dirty = 0;
1415                 saved_bh = NULL;
1416                 /* blocknr of 0 is no longer in the hash, ignore it */
1417                 if (cn->blocknr == 0) {
1418                         goto free_cnode;
1419                 }
1420
1421                 /*
1422                  * This transaction failed commit.
1423                  * Don't write out to the disk
1424                  */
1425                 if (!(jl->j_state & LIST_DIRTY))
1426                         goto free_cnode;
1427
1428                 pjl = find_newer_jl_for_cn(cn);
1429                 /*
1430                  * the order is important here.  We check pjl to make sure we
1431                  * don't clear BH_JDirty_wait if we aren't the one writing this
1432                  * block to disk
1433                  */
1434                 if (!pjl && cn->bh) {
1435                         saved_bh = cn->bh;
1436
1437                         /*
1438                          * we do this to make sure nobody releases the
1439                          * buffer while we are working with it
1440                          */
1441                         get_bh(saved_bh);
1442
1443                         if (buffer_journal_dirty(saved_bh)) {
1444                                 BUG_ON(!can_dirty(cn));
1445                                 was_jwait = 1;
1446                                 was_dirty = 1;
1447                         } else if (can_dirty(cn)) {
1448                                 /*
1449                                  * everything with !pjl && jwait
1450                                  * should be writable
1451                                  */
1452                                 BUG();
1453                         }
1454                 }
1455
1456                 /*
1457                  * if someone has this block in a newer transaction, just make
1458                  * sure they are committed, and don't try writing it to disk
1459                  */
1460                 if (pjl) {
1461                         if (atomic_read(&pjl->j_commit_left))
1462                                 flush_commit_list(s, pjl, 1);
1463                         goto free_cnode;
1464                 }
1465
1466                 /*
1467                  * bh == NULL when the block got to disk on its own, OR,
1468                  * the block got freed in a future transaction
1469                  */
1470                 if (saved_bh == NULL) {
1471                         goto free_cnode;
1472                 }
1473
1474                 /*
1475                  * this should never happen.  kupdate_one_transaction has
1476                  * this list locked while it works, so we should never see a
1477                  * buffer here that is not marked JDirty_wait
1478                  */
1479                 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1480                         reiserfs_warning(s, "journal-813",
1481                                          "BAD! buffer %llu %cdirty %cjwait, "
1482                                          "not in a newer transaction",
1483                                          (unsigned long long)saved_bh->
1484                                          b_blocknr, was_dirty ? ' ' : '!',
1485                                          was_jwait ? ' ' : '!');
1486                 }
1487                 if (was_dirty) {
1488                         /*
1489                          * we inc again because saved_bh gets decremented
1490                          * at free_cnode
1491                          */
1492                         get_bh(saved_bh);
1493                         set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1494                         lock_buffer(saved_bh);
1495                         BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1496                         if (buffer_dirty(saved_bh))
1497                                 submit_logged_buffer(saved_bh);
1498                         else
1499                                 unlock_buffer(saved_bh);
1500                         count++;
1501                 } else {
1502                         reiserfs_warning(s, "clm-2082",
1503                                          "Unable to flush buffer %llu in %s",
1504                                          (unsigned long long)saved_bh->
1505                                          b_blocknr, __func__);
1506                 }
1507 free_cnode:
1508                 cn = cn->next;
1509                 if (saved_bh) {
1510                         /*
1511                          * we incremented this to keep others from
1512                          * taking the buffer head away
1513                          */
1514                         put_bh(saved_bh);
1515                         if (atomic_read(&saved_bh->b_count) < 0) {
1516                                 reiserfs_warning(s, "journal-945",
1517                                                  "saved_bh->b_count < 0");
1518                         }
1519                 }
1520         }
1521         if (count > 0) {
1522                 cn = jl->j_realblock;
1523                 while (cn) {
1524                         if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1525                                 if (!cn->bh) {
1526                                         reiserfs_panic(s, "journal-1011",
1527                                                        "cn->bh is NULL");
1528                                 }
1529
1530                                 depth = reiserfs_write_unlock_nested(s);
1531                                 __wait_on_buffer(cn->bh);
1532                                 reiserfs_write_lock_nested(s, depth);
1533
1534                                 if (!cn->bh) {
1535                                         reiserfs_panic(s, "journal-1012",
1536                                                        "cn->bh is NULL");
1537                                 }
1538                                 if (unlikely(!buffer_uptodate(cn->bh))) {
1539 #ifdef CONFIG_REISERFS_CHECK
1540                                         reiserfs_warning(s, "journal-949",
1541                                                          "buffer write failed");
1542 #endif
1543                                         err = -EIO;
1544                                 }
1545                                 /*
1546                                  * note, we must clear the JDirty_wait bit
1547                                  * after the up to date check, otherwise we
1548                                  * race against our flushpage routine
1549                                  */
1550                                 BUG_ON(!test_clear_buffer_journal_dirty
1551                                        (cn->bh));
1552
1553                                 /* drop one ref for us */
1554                                 put_bh(cn->bh);
1555                                 /* drop one ref for journal_mark_dirty */
1556                                 release_buffer_page(cn->bh);
1557                         }
1558                         cn = cn->next;
1559                 }
1560         }
1561
1562         if (err)
1563                 reiserfs_abort(s, -EIO,
1564                                "Write error while pushing transaction to disk in %s",
1565                                __func__);
1566 flush_older_and_return:
1567
1568         /*
1569          * before we can update the journal header block, we _must_ flush all
1570          * real blocks from all older transactions to disk.  This is because
1571          * once the header block is updated, this transaction will not be
1572          * replayed after a crash
1573          */
1574         if (flushall) {
1575                 flush_older_journal_lists(s, jl);
1576         }
1577
1578         err = journal->j_errno;
1579         /*
1580          * before we can remove everything from the hash tables for this
1581          * transaction, we must make sure it can never be replayed
1582          *
1583          * since we are only called from do_journal_end, we know for sure there
1584          * are no allocations going on while we are flushing journal lists.  So,
1585          * we only need to update the journal header block for the last list
1586          * being flushed
1587          */
1588         if (!err && flushall) {
1589                 err =
1590                     update_journal_header_block(s,
1591                                                 (jl->j_start + jl->j_len +
1592                                                  2) % SB_ONDISK_JOURNAL_SIZE(s),
1593                                                 jl->j_trans_id);
1594                 if (err)
1595                         reiserfs_abort(s, -EIO,
1596                                        "Write error while updating journal header in %s",
1597                                        __func__);
1598         }
1599         remove_all_from_journal_list(s, jl, 0);
1600         list_del_init(&jl->j_list);
1601         journal->j_num_lists--;
1602         del_from_work_list(s, jl);
1603
1604         if (journal->j_last_flush_id != 0 &&
1605             (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1606                 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1607                                  journal->j_last_flush_id, jl->j_trans_id);
1608         }
1609         journal->j_last_flush_id = jl->j_trans_id;
1610
1611         /*
1612          * not strictly required since we are freeing the list, but it should
1613          * help find code using dead lists later on
1614          */
1615         jl->j_len = 0;
1616         atomic_set(&jl->j_nonzerolen, 0);
1617         jl->j_start = 0;
1618         jl->j_realblock = NULL;
1619         jl->j_commit_bh = NULL;
1620         jl->j_trans_id = 0;
1621         jl->j_state = 0;
1622         put_journal_list(s, jl);
1623         if (flushall)
1624                 mutex_unlock(&journal->j_flush_mutex);
1625         return err;
1626 }
1627
1628 static int write_one_transaction(struct super_block *s,
1629                                  struct reiserfs_journal_list *jl,
1630                                  struct buffer_chunk *chunk)
1631 {
1632         struct reiserfs_journal_cnode *cn;
1633         int ret = 0;
1634
1635         jl->j_state |= LIST_TOUCHED;
1636         del_from_work_list(s, jl);
1637         if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1638                 return 0;
1639         }
1640
1641         cn = jl->j_realblock;
1642         while (cn) {
1643                 /*
1644                  * if the blocknr == 0, this has been cleared from the hash,
1645                  * skip it
1646                  */
1647                 if (cn->blocknr == 0) {
1648                         goto next;
1649                 }
1650                 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1651                         struct buffer_head *tmp_bh;
1652                         /*
1653                          * we can race against journal_mark_freed when we try
1654                          * to lock_buffer(cn->bh), so we have to inc the buffer
1655                          * count, and recheck things after locking
1656                          */
1657                         tmp_bh = cn->bh;
1658                         get_bh(tmp_bh);
1659                         lock_buffer(tmp_bh);
1660                         if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1661                                 if (!buffer_journal_dirty(tmp_bh) ||
1662                                     buffer_journal_prepared(tmp_bh))
1663                                         BUG();
1664                                 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1665                                 ret++;
1666                         } else {
1667                                 /* note, cn->bh might be null now */
1668                                 unlock_buffer(tmp_bh);
1669                         }
1670                         put_bh(tmp_bh);
1671                 }
1672 next:
1673                 cn = cn->next;
1674                 cond_resched();
1675         }
1676         return ret;
1677 }
1678
1679 /* used by flush_commit_list */
1680 static void dirty_one_transaction(struct super_block *s,
1681                                  struct reiserfs_journal_list *jl)
1682 {
1683         struct reiserfs_journal_cnode *cn;
1684         struct reiserfs_journal_list *pjl;
1685
1686         jl->j_state |= LIST_DIRTY;
1687         cn = jl->j_realblock;
1688         while (cn) {
1689                 /*
1690                  * look for a more recent transaction that logged this
1691                  * buffer.  Only the most recent transaction with a buffer in
1692                  * it is allowed to send that buffer to disk
1693                  */
1694                 pjl = find_newer_jl_for_cn(cn);
1695                 if (!pjl && cn->blocknr && cn->bh
1696                     && buffer_journal_dirty(cn->bh)) {
1697                         BUG_ON(!can_dirty(cn));
1698                         /*
1699                          * if the buffer is prepared, it will either be logged
1700                          * or restored.  If restored, we need to make sure
1701                          * it actually gets marked dirty
1702                          */
1703                         clear_buffer_journal_new(cn->bh);
1704                         if (buffer_journal_prepared(cn->bh)) {
1705                                 set_buffer_journal_restore_dirty(cn->bh);
1706                         } else {
1707                                 set_buffer_journal_test(cn->bh);
1708                                 mark_buffer_dirty(cn->bh);
1709                         }
1710                 }
1711                 cn = cn->next;
1712         }
1713 }
1714
1715 static int kupdate_transactions(struct super_block *s,
1716                                 struct reiserfs_journal_list *jl,
1717                                 struct reiserfs_journal_list **next_jl,
1718                                 unsigned int *next_trans_id,
1719                                 int num_blocks, int num_trans)
1720 {
1721         int ret = 0;
1722         int written = 0;
1723         int transactions_flushed = 0;
1724         unsigned int orig_trans_id = jl->j_trans_id;
1725         struct buffer_chunk chunk;
1726         struct list_head *entry;
1727         struct reiserfs_journal *journal = SB_JOURNAL(s);
1728         chunk.nr = 0;
1729
1730         reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1731         if (!journal_list_still_alive(s, orig_trans_id)) {
1732                 goto done;
1733         }
1734
1735         /*
1736          * we've got j_flush_mutex held, nobody is going to delete any
1737          * of these lists out from underneath us
1738          */
1739         while ((num_trans && transactions_flushed < num_trans) ||
1740                (!num_trans && written < num_blocks)) {
1741
1742                 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1743                     atomic_read(&jl->j_commit_left)
1744                     || !(jl->j_state & LIST_DIRTY)) {
1745                         del_from_work_list(s, jl);
1746                         break;
1747                 }
1748                 ret = write_one_transaction(s, jl, &chunk);
1749
1750                 if (ret < 0)
1751                         goto done;
1752                 transactions_flushed++;
1753                 written += ret;
1754                 entry = jl->j_list.next;
1755
1756                 /* did we wrap? */
1757                 if (entry == &journal->j_journal_list) {
1758                         break;
1759                 }
1760                 jl = JOURNAL_LIST_ENTRY(entry);
1761
1762                 /* don't bother with older transactions */
1763                 if (jl->j_trans_id <= orig_trans_id)
1764                         break;
1765         }
1766         if (chunk.nr) {
1767                 write_chunk(&chunk);
1768         }
1769
1770 done:
1771         mutex_unlock(&journal->j_flush_mutex);
1772         return ret;
1773 }
1774
1775 /*
1776  * for o_sync and fsync heavy applications, they tend to use
1777  * all the journa list slots with tiny transactions.  These
1778  * trigger lots and lots of calls to update the header block, which
1779  * adds seeks and slows things down.
1780  *
1781  * This function tries to clear out a large chunk of the journal lists
1782  * at once, which makes everything faster since only the newest journal
1783  * list updates the header block
1784  */
1785 static int flush_used_journal_lists(struct super_block *s,
1786                                     struct reiserfs_journal_list *jl)
1787 {
1788         unsigned long len = 0;
1789         unsigned long cur_len;
1790         int i;
1791         int limit = 256;
1792         struct reiserfs_journal_list *tjl;
1793         struct reiserfs_journal_list *flush_jl;
1794         unsigned int trans_id;
1795         struct reiserfs_journal *journal = SB_JOURNAL(s);
1796
1797         flush_jl = tjl = jl;
1798
1799         /* in data logging mode, try harder to flush a lot of blocks */
1800         if (reiserfs_data_log(s))
1801                 limit = 1024;
1802         /* flush for 256 transactions or limit blocks, whichever comes first */
1803         for (i = 0; i < 256 && len < limit; i++) {
1804                 if (atomic_read(&tjl->j_commit_left) ||
1805                     tjl->j_trans_id < jl->j_trans_id) {
1806                         break;
1807                 }
1808                 cur_len = atomic_read(&tjl->j_nonzerolen);
1809                 if (cur_len > 0) {
1810                         tjl->j_state &= ~LIST_TOUCHED;
1811                 }
1812                 len += cur_len;
1813                 flush_jl = tjl;
1814                 if (tjl->j_list.next == &journal->j_journal_list)
1815                         break;
1816                 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1817         }
1818         get_journal_list(jl);
1819         get_journal_list(flush_jl);
1820
1821         /*
1822          * try to find a group of blocks we can flush across all the
1823          * transactions, but only bother if we've actually spanned
1824          * across multiple lists
1825          */
1826         if (flush_jl != jl)
1827                 kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1828
1829         flush_journal_list(s, flush_jl, 1);
1830         put_journal_list(s, flush_jl);
1831         put_journal_list(s, jl);
1832         return 0;
1833 }
1834
1835 /*
1836  * removes any nodes in table with name block and dev as bh.
1837  * only touchs the hnext and hprev pointers.
1838  */
1839 static void remove_journal_hash(struct super_block *sb,
1840                          struct reiserfs_journal_cnode **table,
1841                          struct reiserfs_journal_list *jl,
1842                          unsigned long block, int remove_freed)
1843 {
1844         struct reiserfs_journal_cnode *cur;
1845         struct reiserfs_journal_cnode **head;
1846
1847         head = &(journal_hash(table, sb, block));
1848         if (!head) {
1849                 return;
1850         }
1851         cur = *head;
1852         while (cur) {
1853                 if (cur->blocknr == block && cur->sb == sb
1854                     && (jl == NULL || jl == cur->jlist)
1855                     && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1856                         if (cur->hnext) {
1857                                 cur->hnext->hprev = cur->hprev;
1858                         }
1859                         if (cur->hprev) {
1860                                 cur->hprev->hnext = cur->hnext;
1861                         } else {
1862                                 *head = cur->hnext;
1863                         }
1864                         cur->blocknr = 0;
1865                         cur->sb = NULL;
1866                         cur->state = 0;
1867                         /*
1868                          * anybody who clears the cur->bh will also
1869                          * dec the nonzerolen
1870                          */
1871                         if (cur->bh && cur->jlist)
1872                                 atomic_dec(&cur->jlist->j_nonzerolen);
1873                         cur->bh = NULL;
1874                         cur->jlist = NULL;
1875                 }
1876                 cur = cur->hnext;
1877         }
1878 }
1879
1880 static void free_journal_ram(struct super_block *sb)
1881 {
1882         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1883         kfree(journal->j_current_jl);
1884         journal->j_num_lists--;
1885
1886         vfree(journal->j_cnode_free_orig);
1887         free_list_bitmaps(sb, journal->j_list_bitmap);
1888         free_bitmap_nodes(sb);  /* must be after free_list_bitmaps */
1889         if (journal->j_header_bh) {
1890                 brelse(journal->j_header_bh);
1891         }
1892         /*
1893          * j_header_bh is on the journal dev, make sure
1894          * not to release the journal dev until we brelse j_header_bh
1895          */
1896         release_journal_dev(sb, journal);
1897         vfree(journal);
1898 }
1899
1900 /*
1901  * call on unmount.  Only set error to 1 if you haven't made your way out
1902  * of read_super() yet.  Any other caller must keep error at 0.
1903  */
1904 static int do_journal_release(struct reiserfs_transaction_handle *th,
1905                               struct super_block *sb, int error)
1906 {
1907         struct reiserfs_transaction_handle myth;
1908         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1909
1910         /*
1911          * we only want to flush out transactions if we were
1912          * called with error == 0
1913          */
1914         if (!error && !sb_rdonly(sb)) {
1915                 /* end the current trans */
1916                 BUG_ON(!th->t_trans_id);
1917                 do_journal_end(th, FLUSH_ALL);
1918
1919                 /*
1920                  * make sure something gets logged to force
1921                  * our way into the flush code
1922                  */
1923                 if (!journal_join(&myth, sb)) {
1924                         reiserfs_prepare_for_journal(sb,
1925                                                      SB_BUFFER_WITH_SB(sb),
1926                                                      1);
1927                         journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1928                         do_journal_end(&myth, FLUSH_ALL);
1929                 }
1930         }
1931
1932         /* this also catches errors during the do_journal_end above */
1933         if (!error && reiserfs_is_journal_aborted(journal)) {
1934                 memset(&myth, 0, sizeof(myth));
1935                 if (!journal_join_abort(&myth, sb)) {
1936                         reiserfs_prepare_for_journal(sb,
1937                                                      SB_BUFFER_WITH_SB(sb),
1938                                                      1);
1939                         journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1940                         do_journal_end(&myth, FLUSH_ALL);
1941                 }
1942         }
1943
1944
1945         /*
1946          * We must release the write lock here because
1947          * the workqueue job (flush_async_commit) needs this lock
1948          */
1949         reiserfs_write_unlock(sb);
1950
1951         /*
1952          * Cancel flushing of old commits. Note that neither of these works
1953          * will be requeued because superblock is being shutdown and doesn't
1954          * have SB_ACTIVE set.
1955          */
1956         reiserfs_cancel_old_flush(sb);
1957         /* wait for all commits to finish */
1958         cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1959
1960         free_journal_ram(sb);
1961
1962         reiserfs_write_lock(sb);
1963
1964         return 0;
1965 }
1966
1967 /* * call on unmount.  flush all journal trans, release all alloc'd ram */
1968 int journal_release(struct reiserfs_transaction_handle *th,
1969                     struct super_block *sb)
1970 {
1971         return do_journal_release(th, sb, 0);
1972 }
1973
1974 /* only call from an error condition inside reiserfs_read_super!  */
1975 int journal_release_error(struct reiserfs_transaction_handle *th,
1976                           struct super_block *sb)
1977 {
1978         return do_journal_release(th, sb, 1);
1979 }
1980
1981 /*
1982  * compares description block with commit block.
1983  * returns 1 if they differ, 0 if they are the same
1984  */
1985 static int journal_compare_desc_commit(struct super_block *sb,
1986                                        struct reiserfs_journal_desc *desc,
1987                                        struct reiserfs_journal_commit *commit)
1988 {
1989         if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1990             get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1991             get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1992             get_commit_trans_len(commit) <= 0) {
1993                 return 1;
1994         }
1995         return 0;
1996 }
1997
1998 /*
1999  * returns 0 if it did not find a description block
2000  * returns -1 if it found a corrupt commit block
2001  * returns 1 if both desc and commit were valid
2002  * NOTE: only called during fs mount
2003  */
2004 static int journal_transaction_is_valid(struct super_block *sb,
2005                                         struct buffer_head *d_bh,
2006                                         unsigned int *oldest_invalid_trans_id,
2007                                         unsigned long *newest_mount_id)
2008 {
2009         struct reiserfs_journal_desc *desc;
2010         struct reiserfs_journal_commit *commit;
2011         struct buffer_head *c_bh;
2012         unsigned long offset;
2013
2014         if (!d_bh)
2015                 return 0;
2016
2017         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2018         if (get_desc_trans_len(desc) > 0
2019             && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2020                 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2021                     && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2022                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2023                                        "journal-986: transaction "
2024                                        "is valid returning because trans_id %d is greater than "
2025                                        "oldest_invalid %lu",
2026                                        get_desc_trans_id(desc),
2027                                        *oldest_invalid_trans_id);
2028                         return 0;
2029                 }
2030                 if (newest_mount_id
2031                     && *newest_mount_id > get_desc_mount_id(desc)) {
2032                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2033                                        "journal-1087: transaction "
2034                                        "is valid returning because mount_id %d is less than "
2035                                        "newest_mount_id %lu",
2036                                        get_desc_mount_id(desc),
2037                                        *newest_mount_id);
2038                         return -1;
2039                 }
2040                 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2041                         reiserfs_warning(sb, "journal-2018",
2042                                          "Bad transaction length %d "
2043                                          "encountered, ignoring transaction",
2044                                          get_desc_trans_len(desc));
2045                         return -1;
2046                 }
2047                 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2048
2049                 /*
2050                  * ok, we have a journal description block,
2051                  * let's see if the transaction was valid
2052                  */
2053                 c_bh =
2054                     journal_bread(sb,
2055                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2056                                   ((offset + get_desc_trans_len(desc) +
2057                                     1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2058                 if (!c_bh)
2059                         return 0;
2060                 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2061                 if (journal_compare_desc_commit(sb, desc, commit)) {
2062                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2063                                        "journal_transaction_is_valid, commit offset %ld had bad "
2064                                        "time %d or length %d",
2065                                        c_bh->b_blocknr -
2066                                        SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2067                                        get_commit_trans_id(commit),
2068                                        get_commit_trans_len(commit));
2069                         brelse(c_bh);
2070                         if (oldest_invalid_trans_id) {
2071                                 *oldest_invalid_trans_id =
2072                                     get_desc_trans_id(desc);
2073                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2074                                                "journal-1004: "
2075                                                "transaction_is_valid setting oldest invalid trans_id "
2076                                                "to %d",
2077                                                get_desc_trans_id(desc));
2078                         }
2079                         return -1;
2080                 }
2081                 brelse(c_bh);
2082                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2083                                "journal-1006: found valid "
2084                                "transaction start offset %llu, len %d id %d",
2085                                d_bh->b_blocknr -
2086                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2087                                get_desc_trans_len(desc),
2088                                get_desc_trans_id(desc));
2089                 return 1;
2090         } else {
2091                 return 0;
2092         }
2093 }
2094
2095 static void brelse_array(struct buffer_head **heads, int num)
2096 {
2097         int i;
2098         for (i = 0; i < num; i++) {
2099                 brelse(heads[i]);
2100         }
2101 }
2102
2103 /*
2104  * given the start, and values for the oldest acceptable transactions,
2105  * this either reads in a replays a transaction, or returns because the
2106  * transaction is invalid, or too old.
2107  * NOTE: only called during fs mount
2108  */
2109 static int journal_read_transaction(struct super_block *sb,
2110                                     unsigned long cur_dblock,
2111                                     unsigned long oldest_start,
2112                                     unsigned int oldest_trans_id,
2113                                     unsigned long newest_mount_id)
2114 {
2115         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2116         struct reiserfs_journal_desc *desc;
2117         struct reiserfs_journal_commit *commit;
2118         unsigned int trans_id = 0;
2119         struct buffer_head *c_bh;
2120         struct buffer_head *d_bh;
2121         struct buffer_head **log_blocks = NULL;
2122         struct buffer_head **real_blocks = NULL;
2123         unsigned int trans_offset;
2124         int i;
2125         int trans_half;
2126
2127         d_bh = journal_bread(sb, cur_dblock);
2128         if (!d_bh)
2129                 return 1;
2130         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2131         trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2132         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2133                        "journal_read_transaction, offset %llu, len %d mount_id %d",
2134                        d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2135                        get_desc_trans_len(desc), get_desc_mount_id(desc));
2136         if (get_desc_trans_id(desc) < oldest_trans_id) {
2137                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2138                                "journal_read_trans skipping because %lu is too old",
2139                                cur_dblock -
2140                                SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2141                 brelse(d_bh);
2142                 return 1;
2143         }
2144         if (get_desc_mount_id(desc) != newest_mount_id) {
2145                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2146                                "journal_read_trans skipping because %d is != "
2147                                "newest_mount_id %lu", get_desc_mount_id(desc),
2148                                newest_mount_id);
2149                 brelse(d_bh);
2150                 return 1;
2151         }
2152         c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2153                              ((trans_offset + get_desc_trans_len(desc) + 1) %
2154                               SB_ONDISK_JOURNAL_SIZE(sb)));
2155         if (!c_bh) {
2156                 brelse(d_bh);
2157                 return 1;
2158         }
2159         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2160         if (journal_compare_desc_commit(sb, desc, commit)) {
2161                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2162                                "journal_read_transaction, "
2163                                "commit offset %llu had bad time %d or length %d",
2164                                c_bh->b_blocknr -
2165                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2166                                get_commit_trans_id(commit),
2167                                get_commit_trans_len(commit));
2168                 brelse(c_bh);
2169                 brelse(d_bh);
2170                 return 1;
2171         }
2172
2173         if (bdev_read_only(sb->s_bdev)) {
2174                 reiserfs_warning(sb, "clm-2076",
2175                                  "device is readonly, unable to replay log");
2176                 brelse(c_bh);
2177                 brelse(d_bh);
2178                 return -EROFS;
2179         }
2180
2181         trans_id = get_desc_trans_id(desc);
2182         /*
2183          * now we know we've got a good transaction, and it was
2184          * inside the valid time ranges
2185          */
2186         log_blocks = kmalloc_array(get_desc_trans_len(desc),
2187                                    sizeof(struct buffer_head *),
2188                                    GFP_NOFS);
2189         real_blocks = kmalloc_array(get_desc_trans_len(desc),
2190                                     sizeof(struct buffer_head *),
2191                                     GFP_NOFS);
2192         if (!log_blocks || !real_blocks) {
2193                 brelse(c_bh);
2194                 brelse(d_bh);
2195                 kfree(log_blocks);
2196                 kfree(real_blocks);
2197                 reiserfs_warning(sb, "journal-1169",
2198                                  "kmalloc failed, unable to mount FS");
2199                 return -1;
2200         }
2201         /* get all the buffer heads */
2202         trans_half = journal_trans_half(sb->s_blocksize);
2203         for (i = 0; i < get_desc_trans_len(desc); i++) {
2204                 log_blocks[i] =
2205                     journal_getblk(sb,
2206                                    SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2207                                    (trans_offset + 1 +
2208                                     i) % SB_ONDISK_JOURNAL_SIZE(sb));
2209                 if (i < trans_half) {
2210                         real_blocks[i] =
2211                             sb_getblk(sb,
2212                                       le32_to_cpu(desc->j_realblock[i]));
2213                 } else {
2214                         real_blocks[i] =
2215                             sb_getblk(sb,
2216                                       le32_to_cpu(commit->
2217                                                   j_realblock[i - trans_half]));
2218                 }
2219                 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2220                         reiserfs_warning(sb, "journal-1207",
2221                                          "REPLAY FAILURE fsck required! "
2222                                          "Block to replay is outside of "
2223                                          "filesystem");
2224                         goto abort_replay;
2225                 }
2226                 /* make sure we don't try to replay onto log or reserved area */
2227                 if (is_block_in_log_or_reserved_area
2228                     (sb, real_blocks[i]->b_blocknr)) {
2229                         reiserfs_warning(sb, "journal-1204",
2230                                          "REPLAY FAILURE fsck required! "
2231                                          "Trying to replay onto a log block");
2232 abort_replay:
2233                         brelse_array(log_blocks, i);
2234                         brelse_array(real_blocks, i);
2235                         brelse(c_bh);
2236                         brelse(d_bh);
2237                         kfree(log_blocks);
2238                         kfree(real_blocks);
2239                         return -1;
2240                 }
2241         }
2242         /* read in the log blocks, memcpy to the corresponding real block */
2243         bh_read_batch(get_desc_trans_len(desc), log_blocks);
2244         for (i = 0; i < get_desc_trans_len(desc); i++) {
2245
2246                 wait_on_buffer(log_blocks[i]);
2247                 if (!buffer_uptodate(log_blocks[i])) {
2248                         reiserfs_warning(sb, "journal-1212",
2249                                          "REPLAY FAILURE fsck required! "
2250                                          "buffer write failed");
2251                         brelse_array(log_blocks + i,
2252                                      get_desc_trans_len(desc) - i);
2253                         brelse_array(real_blocks, get_desc_trans_len(desc));
2254                         brelse(c_bh);
2255                         brelse(d_bh);
2256                         kfree(log_blocks);
2257                         kfree(real_blocks);
2258                         return -1;
2259                 }
2260                 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2261                        real_blocks[i]->b_size);
2262                 set_buffer_uptodate(real_blocks[i]);
2263                 brelse(log_blocks[i]);
2264         }
2265         /* flush out the real blocks */
2266         for (i = 0; i < get_desc_trans_len(desc); i++) {
2267                 set_buffer_dirty(real_blocks[i]);
2268                 write_dirty_buffer(real_blocks[i], 0);
2269         }
2270         for (i = 0; i < get_desc_trans_len(desc); i++) {
2271                 wait_on_buffer(real_blocks[i]);
2272                 if (!buffer_uptodate(real_blocks[i])) {
2273                         reiserfs_warning(sb, "journal-1226",
2274                                          "REPLAY FAILURE, fsck required! "
2275                                          "buffer write failed");
2276                         brelse_array(real_blocks + i,
2277                                      get_desc_trans_len(desc) - i);
2278                         brelse(c_bh);
2279                         brelse(d_bh);
2280                         kfree(log_blocks);
2281                         kfree(real_blocks);
2282                         return -1;
2283                 }
2284                 brelse(real_blocks[i]);
2285         }
2286         cur_dblock =
2287             SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2288             ((trans_offset + get_desc_trans_len(desc) +
2289               2) % SB_ONDISK_JOURNAL_SIZE(sb));
2290         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2291                        "journal-1095: setting journal " "start to offset %ld",
2292                        cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2293
2294         /*
2295          * init starting values for the first transaction, in case
2296          * this is the last transaction to be replayed.
2297          */
2298         journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2299         journal->j_last_flush_trans_id = trans_id;
2300         journal->j_trans_id = trans_id + 1;
2301         /* check for trans_id overflow */
2302         if (journal->j_trans_id == 0)
2303                 journal->j_trans_id = 10;
2304         brelse(c_bh);
2305         brelse(d_bh);
2306         kfree(log_blocks);
2307         kfree(real_blocks);
2308         return 0;
2309 }
2310
2311 /*
2312  * This function reads blocks starting from block and to max_block of bufsize
2313  * size (but no more than BUFNR blocks at a time). This proved to improve
2314  * mounting speed on self-rebuilding raid5 arrays at least.
2315  * Right now it is only used from journal code. But later we might use it
2316  * from other places.
2317  * Note: Do not use journal_getblk/sb_getblk functions here!
2318  */
2319 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2320                                            b_blocknr_t block, int bufsize,
2321                                            b_blocknr_t max_block)
2322 {
2323         struct buffer_head *bhlist[BUFNR];
2324         unsigned int blocks = BUFNR;
2325         struct buffer_head *bh;
2326         int i, j;
2327
2328         bh = __getblk(dev, block, bufsize);
2329         if (buffer_uptodate(bh))
2330                 return (bh);
2331
2332         if (block + BUFNR > max_block) {
2333                 blocks = max_block - block;
2334         }
2335         bhlist[0] = bh;
2336         j = 1;
2337         for (i = 1; i < blocks; i++) {
2338                 bh = __getblk(dev, block + i, bufsize);
2339                 if (buffer_uptodate(bh)) {
2340                         brelse(bh);
2341                         break;
2342                 } else
2343                         bhlist[j++] = bh;
2344         }
2345         bh = bhlist[0];
2346         bh_read_nowait(bh, 0);
2347         bh_readahead_batch(j - 1, &bhlist[1], 0);
2348         for (i = 1; i < j; i++)
2349                 brelse(bhlist[i]);
2350         wait_on_buffer(bh);
2351         if (buffer_uptodate(bh))
2352                 return bh;
2353         brelse(bh);
2354         return NULL;
2355 }
2356
2357 /*
2358  * read and replay the log
2359  * on a clean unmount, the journal header's next unflushed pointer will be
2360  * to an invalid transaction.  This tests that before finding all the
2361  * transactions in the log, which makes normal mount times fast.
2362  *
2363  * After a crash, this starts with the next unflushed transaction, and
2364  * replays until it finds one too old, or invalid.
2365  *
2366  * On exit, it sets things up so the first transaction will work correctly.
2367  * NOTE: only called during fs mount
2368  */
2369 static int journal_read(struct super_block *sb)
2370 {
2371         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2372         struct reiserfs_journal_desc *desc;
2373         unsigned int oldest_trans_id = 0;
2374         unsigned int oldest_invalid_trans_id = 0;
2375         time64_t start;
2376         unsigned long oldest_start = 0;
2377         unsigned long cur_dblock = 0;
2378         unsigned long newest_mount_id = 9;
2379         struct buffer_head *d_bh;
2380         struct reiserfs_journal_header *jh;
2381         int valid_journal_header = 0;
2382         int replay_count = 0;
2383         int continue_replay = 1;
2384         int ret;
2385
2386         cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2387         reiserfs_info(sb, "checking transaction log (%pg)\n",
2388                       journal->j_dev_bd);
2389         start = ktime_get_seconds();
2390
2391         /*
2392          * step 1, read in the journal header block.  Check the transaction
2393          * it says is the first unflushed, and if that transaction is not
2394          * valid, replay is done
2395          */
2396         journal->j_header_bh = journal_bread(sb,
2397                                              SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2398                                              + SB_ONDISK_JOURNAL_SIZE(sb));
2399         if (!journal->j_header_bh) {
2400                 return 1;
2401         }
2402         jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2403         if (le32_to_cpu(jh->j_first_unflushed_offset) <
2404             SB_ONDISK_JOURNAL_SIZE(sb)
2405             && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2406                 oldest_start =
2407                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2408                     le32_to_cpu(jh->j_first_unflushed_offset);
2409                 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2410                 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2411                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2412                                "journal-1153: found in "
2413                                "header: first_unflushed_offset %d, last_flushed_trans_id "
2414                                "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2415                                le32_to_cpu(jh->j_last_flush_trans_id));
2416                 valid_journal_header = 1;
2417
2418                 /*
2419                  * now, we try to read the first unflushed offset.  If it
2420                  * is not valid, there is nothing more we can do, and it
2421                  * makes no sense to read through the whole log.
2422                  */
2423                 d_bh =
2424                     journal_bread(sb,
2425                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2426                                   le32_to_cpu(jh->j_first_unflushed_offset));
2427                 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2428                 if (!ret) {
2429                         continue_replay = 0;
2430                 }
2431                 brelse(d_bh);
2432                 goto start_log_replay;
2433         }
2434
2435         /*
2436          * ok, there are transactions that need to be replayed.  start
2437          * with the first log block, find all the valid transactions, and
2438          * pick out the oldest.
2439          */
2440         while (continue_replay
2441                && cur_dblock <
2442                (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2443                 SB_ONDISK_JOURNAL_SIZE(sb))) {
2444                 /*
2445                  * Note that it is required for blocksize of primary fs
2446                  * device and journal device to be the same
2447                  */
2448                 d_bh =
2449                     reiserfs_breada(journal->j_dev_bd, cur_dblock,
2450                                     sb->s_blocksize,
2451                                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2452                                     SB_ONDISK_JOURNAL_SIZE(sb));
2453                 ret =
2454                     journal_transaction_is_valid(sb, d_bh,
2455                                                  &oldest_invalid_trans_id,
2456                                                  &newest_mount_id);
2457                 if (ret == 1) {
2458                         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2459                         if (oldest_start == 0) {        /* init all oldest_ values */
2460                                 oldest_trans_id = get_desc_trans_id(desc);
2461                                 oldest_start = d_bh->b_blocknr;
2462                                 newest_mount_id = get_desc_mount_id(desc);
2463                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2464                                                "journal-1179: Setting "
2465                                                "oldest_start to offset %llu, trans_id %lu",
2466                                                oldest_start -
2467                                                SB_ONDISK_JOURNAL_1st_BLOCK
2468                                                (sb), oldest_trans_id);
2469                         } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2470                                 /* one we just read was older */
2471                                 oldest_trans_id = get_desc_trans_id(desc);
2472                                 oldest_start = d_bh->b_blocknr;
2473                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2474                                                "journal-1180: Resetting "
2475                                                "oldest_start to offset %lu, trans_id %lu",
2476                                                oldest_start -
2477                                                SB_ONDISK_JOURNAL_1st_BLOCK
2478                                                (sb), oldest_trans_id);
2479                         }
2480                         if (newest_mount_id < get_desc_mount_id(desc)) {
2481                                 newest_mount_id = get_desc_mount_id(desc);
2482                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2483                                                "journal-1299: Setting "
2484                                                "newest_mount_id to %d",
2485                                                get_desc_mount_id(desc));
2486                         }
2487                         cur_dblock += get_desc_trans_len(desc) + 2;
2488                 } else {
2489                         cur_dblock++;
2490                 }
2491                 brelse(d_bh);
2492         }
2493
2494 start_log_replay:
2495         cur_dblock = oldest_start;
2496         if (oldest_trans_id) {
2497                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2498                                "journal-1206: Starting replay "
2499                                "from offset %llu, trans_id %lu",
2500                                cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2501                                oldest_trans_id);
2502
2503         }
2504         replay_count = 0;
2505         while (continue_replay && oldest_trans_id > 0) {
2506                 ret =
2507                     journal_read_transaction(sb, cur_dblock, oldest_start,
2508                                              oldest_trans_id, newest_mount_id);
2509                 if (ret < 0) {
2510                         return ret;
2511                 } else if (ret != 0) {
2512                         break;
2513                 }
2514                 cur_dblock =
2515                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2516                 replay_count++;
2517                 if (cur_dblock == oldest_start)
2518                         break;
2519         }
2520
2521         if (oldest_trans_id == 0) {
2522                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2523                                "journal-1225: No valid " "transactions found");
2524         }
2525         /*
2526          * j_start does not get set correctly if we don't replay any
2527          * transactions.  if we had a valid journal_header, set j_start
2528          * to the first unflushed transaction value, copy the trans_id
2529          * from the header
2530          */
2531         if (valid_journal_header && replay_count == 0) {
2532                 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2533                 journal->j_trans_id =
2534                     le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2535                 /* check for trans_id overflow */
2536                 if (journal->j_trans_id == 0)
2537                         journal->j_trans_id = 10;
2538                 journal->j_last_flush_trans_id =
2539                     le32_to_cpu(jh->j_last_flush_trans_id);
2540                 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2541         } else {
2542                 journal->j_mount_id = newest_mount_id + 1;
2543         }
2544         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2545                        "newest_mount_id to %lu", journal->j_mount_id);
2546         journal->j_first_unflushed_offset = journal->j_start;
2547         if (replay_count > 0) {
2548                 reiserfs_info(sb,
2549                               "replayed %d transactions in %lu seconds\n",
2550                               replay_count, ktime_get_seconds() - start);
2551         }
2552         /* needed to satisfy the locking in _update_journal_header_block */
2553         reiserfs_write_lock(sb);
2554         if (!bdev_read_only(sb->s_bdev) &&
2555             _update_journal_header_block(sb, journal->j_start,
2556                                          journal->j_last_flush_trans_id)) {
2557                 reiserfs_write_unlock(sb);
2558                 /*
2559                  * replay failed, caller must call free_journal_ram and abort
2560                  * the mount
2561                  */
2562                 return -1;
2563         }
2564         reiserfs_write_unlock(sb);
2565         return 0;
2566 }
2567
2568 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2569 {
2570         struct reiserfs_journal_list *jl;
2571         jl = kzalloc(sizeof(struct reiserfs_journal_list),
2572                      GFP_NOFS | __GFP_NOFAIL);
2573         INIT_LIST_HEAD(&jl->j_list);
2574         INIT_LIST_HEAD(&jl->j_working_list);
2575         INIT_LIST_HEAD(&jl->j_tail_bh_list);
2576         INIT_LIST_HEAD(&jl->j_bh_list);
2577         mutex_init(&jl->j_commit_mutex);
2578         SB_JOURNAL(s)->j_num_lists++;
2579         get_journal_list(jl);
2580         return jl;
2581 }
2582
2583 static void journal_list_init(struct super_block *sb)
2584 {
2585         SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2586 }
2587
2588 static void release_journal_dev(struct super_block *super,
2589                                struct reiserfs_journal *journal)
2590 {
2591         if (journal->j_dev_bd != NULL) {
2592                 void *holder = NULL;
2593
2594                 if (journal->j_dev_bd->bd_dev != super->s_dev)
2595                         holder = journal;
2596
2597                 blkdev_put(journal->j_dev_bd, holder);
2598                 journal->j_dev_bd = NULL;
2599         }
2600 }
2601
2602 static int journal_init_dev(struct super_block *super,
2603                             struct reiserfs_journal *journal,
2604                             const char *jdev_name)
2605 {
2606         blk_mode_t blkdev_mode = BLK_OPEN_READ;
2607         void *holder = journal;
2608         int result;
2609         dev_t jdev;
2610
2611         result = 0;
2612
2613         journal->j_dev_bd = NULL;
2614         jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2615             new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2616
2617         if (!bdev_read_only(super->s_bdev))
2618                 blkdev_mode |= BLK_OPEN_WRITE;
2619
2620         /* there is no "jdev" option and journal is on separate device */
2621         if ((!jdev_name || !jdev_name[0])) {
2622                 if (jdev == super->s_dev)
2623                         holder = NULL;
2624                 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode, holder,
2625                                                       NULL);
2626                 if (IS_ERR(journal->j_dev_bd)) {
2627                         result = PTR_ERR(journal->j_dev_bd);
2628                         journal->j_dev_bd = NULL;
2629                         reiserfs_warning(super, "sh-458",
2630                                          "cannot init journal device unknown-block(%u,%u): %i",
2631                                          MAJOR(jdev), MINOR(jdev), result);
2632                         return result;
2633                 } else if (jdev != super->s_dev)
2634                         set_blocksize(journal->j_dev_bd, super->s_blocksize);
2635
2636                 return 0;
2637         }
2638
2639         journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, holder,
2640                                                NULL);
2641         if (IS_ERR(journal->j_dev_bd)) {
2642                 result = PTR_ERR(journal->j_dev_bd);
2643                 journal->j_dev_bd = NULL;
2644                 reiserfs_warning(super, "sh-457",
2645                                  "journal_init_dev: Cannot open '%s': %i",
2646                                  jdev_name, result);
2647                 return result;
2648         }
2649
2650         set_blocksize(journal->j_dev_bd, super->s_blocksize);
2651         reiserfs_info(super,
2652                       "journal_init_dev: journal device: %pg\n",
2653                       journal->j_dev_bd);
2654         return 0;
2655 }
2656
2657 /*
2658  * When creating/tuning a file system user can assign some
2659  * journal params within boundaries which depend on the ratio
2660  * blocksize/standard_blocksize.
2661  *
2662  * For blocks >= standard_blocksize transaction size should
2663  * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2664  * then JOURNAL_TRANS_MAX_DEFAULT.
2665  *
2666  * For blocks < standard_blocksize these boundaries should be
2667  * decreased proportionally.
2668  */
2669 #define REISERFS_STANDARD_BLKSIZE (4096)
2670
2671 static int check_advise_trans_params(struct super_block *sb,
2672                                      struct reiserfs_journal *journal)
2673 {
2674         if (journal->j_trans_max) {
2675                 /* Non-default journal params.  Do sanity check for them. */
2676                 int ratio = 1;
2677                 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2678                         ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2679
2680                 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2681                     journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2682                     SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2683                     JOURNAL_MIN_RATIO) {
2684                         reiserfs_warning(sb, "sh-462",
2685                                          "bad transaction max size (%u). "
2686                                          "FSCK?", journal->j_trans_max);
2687                         return 1;
2688                 }
2689                 if (journal->j_max_batch != (journal->j_trans_max) *
2690                         JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2691                         reiserfs_warning(sb, "sh-463",
2692                                          "bad transaction max batch (%u). "
2693                                          "FSCK?", journal->j_max_batch);
2694                         return 1;
2695                 }
2696         } else {
2697                 /*
2698                  * Default journal params.
2699                  * The file system was created by old version
2700                  * of mkreiserfs, so some fields contain zeros,
2701                  * and we need to advise proper values for them
2702                  */
2703                 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2704                         reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2705                                          sb->s_blocksize);
2706                         return 1;
2707                 }
2708                 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2709                 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2710                 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2711         }
2712         return 0;
2713 }
2714
2715 /* must be called once on fs mount.  calls journal_read for you */
2716 int journal_init(struct super_block *sb, const char *j_dev_name,
2717                  int old_format, unsigned int commit_max_age)
2718 {
2719         int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2720         struct buffer_head *bhjh;
2721         struct reiserfs_super_block *rs;
2722         struct reiserfs_journal_header *jh;
2723         struct reiserfs_journal *journal;
2724         struct reiserfs_journal_list *jl;
2725         int ret;
2726
2727         journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2728         if (!journal) {
2729                 reiserfs_warning(sb, "journal-1256",
2730                                  "unable to get memory for journal structure");
2731                 return 1;
2732         }
2733         INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2734         INIT_LIST_HEAD(&journal->j_prealloc_list);
2735         INIT_LIST_HEAD(&journal->j_working_list);
2736         INIT_LIST_HEAD(&journal->j_journal_list);
2737         journal->j_persistent_trans = 0;
2738         if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2739                                            reiserfs_bmap_count(sb)))
2740                 goto free_and_return;
2741
2742         allocate_bitmap_nodes(sb);
2743
2744         /* reserved for journal area support */
2745         SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2746                                                  REISERFS_OLD_DISK_OFFSET_IN_BYTES
2747                                                  / sb->s_blocksize +
2748                                                  reiserfs_bmap_count(sb) +
2749                                                  1 :
2750                                                  REISERFS_DISK_OFFSET_IN_BYTES /
2751                                                  sb->s_blocksize + 2);
2752
2753         /*
2754          * Sanity check to see is the standard journal fitting
2755          * within first bitmap (actual for small blocksizes)
2756          */
2757         if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2758             (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2759              SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2760                 reiserfs_warning(sb, "journal-1393",
2761                                  "journal does not fit for area addressed "
2762                                  "by first of bitmap blocks. It starts at "
2763                                  "%u and its size is %u. Block size %ld",
2764                                  SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2765                                  SB_ONDISK_JOURNAL_SIZE(sb),
2766                                  sb->s_blocksize);
2767                 goto free_and_return;
2768         }
2769
2770         /*
2771          * Sanity check to see if journal first block is correct.
2772          * If journal first block is invalid it can cause
2773          * zeroing important superblock members.
2774          */
2775         if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2776             SB_ONDISK_JOURNAL_1st_BLOCK(sb) < SB_JOURNAL_1st_RESERVED_BLOCK(sb)) {
2777                 reiserfs_warning(sb, "journal-1393",
2778                                  "journal 1st super block is invalid: 1st reserved block %d, but actual 1st block is %d",
2779                                  SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2780                                  SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2781                 goto free_and_return;
2782         }
2783
2784         if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2785                 reiserfs_warning(sb, "sh-462",
2786                                  "unable to initialize journal device");
2787                 goto free_and_return;
2788         }
2789
2790         rs = SB_DISK_SUPER_BLOCK(sb);
2791
2792         /* read journal header */
2793         bhjh = journal_bread(sb,
2794                              SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2795                              SB_ONDISK_JOURNAL_SIZE(sb));
2796         if (!bhjh) {
2797                 reiserfs_warning(sb, "sh-459",
2798                                  "unable to read journal header");
2799                 goto free_and_return;
2800         }
2801         jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2802
2803         /* make sure that journal matches to the super block */
2804         if (is_reiserfs_jr(rs)
2805             && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2806                 sb_jp_journal_magic(rs))) {
2807                 reiserfs_warning(sb, "sh-460",
2808                                  "journal header magic %x (device %pg) does "
2809                                  "not match to magic found in super block %x",
2810                                  jh->jh_journal.jp_journal_magic,
2811                                  journal->j_dev_bd,
2812                                  sb_jp_journal_magic(rs));
2813                 brelse(bhjh);
2814                 goto free_and_return;
2815         }
2816
2817         journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2818         journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2819         journal->j_max_commit_age =
2820             le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2821         journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2822
2823         if (check_advise_trans_params(sb, journal) != 0)
2824                 goto free_and_return;
2825         journal->j_default_max_commit_age = journal->j_max_commit_age;
2826
2827         if (commit_max_age != 0) {
2828                 journal->j_max_commit_age = commit_max_age;
2829                 journal->j_max_trans_age = commit_max_age;
2830         }
2831
2832         reiserfs_info(sb, "journal params: device %pg, size %u, "
2833                       "journal first block %u, max trans len %u, max batch %u, "
2834                       "max commit age %u, max trans age %u\n",
2835                       journal->j_dev_bd,
2836                       SB_ONDISK_JOURNAL_SIZE(sb),
2837                       SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2838                       journal->j_trans_max,
2839                       journal->j_max_batch,
2840                       journal->j_max_commit_age, journal->j_max_trans_age);
2841
2842         brelse(bhjh);
2843
2844         journal->j_list_bitmap_index = 0;
2845         journal_list_init(sb);
2846
2847         memset(journal->j_list_hash_table, 0,
2848                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2849
2850         INIT_LIST_HEAD(&journal->j_dirty_buffers);
2851         spin_lock_init(&journal->j_dirty_buffers_lock);
2852
2853         journal->j_start = 0;
2854         journal->j_len = 0;
2855         journal->j_len_alloc = 0;
2856         atomic_set(&journal->j_wcount, 0);
2857         atomic_set(&journal->j_async_throttle, 0);
2858         journal->j_bcount = 0;
2859         journal->j_trans_start_time = 0;
2860         journal->j_last = NULL;
2861         journal->j_first = NULL;
2862         init_waitqueue_head(&journal->j_join_wait);
2863         mutex_init(&journal->j_mutex);
2864         mutex_init(&journal->j_flush_mutex);
2865
2866         journal->j_trans_id = 10;
2867         journal->j_mount_id = 10;
2868         journal->j_state = 0;
2869         atomic_set(&journal->j_jlock, 0);
2870         journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2871         journal->j_cnode_free_orig = journal->j_cnode_free_list;
2872         journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2873         journal->j_cnode_used = 0;
2874         journal->j_must_wait = 0;
2875
2876         if (journal->j_cnode_free == 0) {
2877                 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2878                                  "allocation failed (%ld bytes). Journal is "
2879                                  "too large for available memory. Usually "
2880                                  "this is due to a journal that is too large.",
2881                                  sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2882                 goto free_and_return;
2883         }
2884
2885         init_journal_hash(sb);
2886         jl = journal->j_current_jl;
2887
2888         /*
2889          * get_list_bitmap() may call flush_commit_list() which
2890          * requires the lock. Calling flush_commit_list() shouldn't happen
2891          * this early but I like to be paranoid.
2892          */
2893         reiserfs_write_lock(sb);
2894         jl->j_list_bitmap = get_list_bitmap(sb, jl);
2895         reiserfs_write_unlock(sb);
2896         if (!jl->j_list_bitmap) {
2897                 reiserfs_warning(sb, "journal-2005",
2898                                  "get_list_bitmap failed for journal list 0");
2899                 goto free_and_return;
2900         }
2901
2902         ret = journal_read(sb);
2903         if (ret < 0) {
2904                 reiserfs_warning(sb, "reiserfs-2006",
2905                                  "Replay Failure, unable to mount");
2906                 goto free_and_return;
2907         }
2908
2909         INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2910         journal->j_work_sb = sb;
2911         return 0;
2912 free_and_return:
2913         free_journal_ram(sb);
2914         return 1;
2915 }
2916
2917 /*
2918  * test for a polite end of the current transaction.  Used by file_write,
2919  * and should be used by delete to make sure they don't write more than
2920  * can fit inside a single transaction
2921  */
2922 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2923                                    int new_alloc)
2924 {
2925         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2926         time64_t now = ktime_get_seconds();
2927         /* cannot restart while nested */
2928         BUG_ON(!th->t_trans_id);
2929         if (th->t_refcount > 1)
2930                 return 0;
2931         if (journal->j_must_wait > 0 ||
2932             (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2933             atomic_read(&journal->j_jlock) ||
2934             (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2935             journal->j_cnode_free < (journal->j_trans_max * 3)) {
2936                 return 1;
2937         }
2938
2939         journal->j_len_alloc += new_alloc;
2940         th->t_blocks_allocated += new_alloc ;
2941         return 0;
2942 }
2943
2944 /* this must be called inside a transaction */
2945 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2946 {
2947         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2948         BUG_ON(!th->t_trans_id);
2949         journal->j_must_wait = 1;
2950         set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2951         return;
2952 }
2953
2954 /* this must be called without a transaction started */
2955 void reiserfs_allow_writes(struct super_block *s)
2956 {
2957         struct reiserfs_journal *journal = SB_JOURNAL(s);
2958         clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2959         wake_up(&journal->j_join_wait);
2960 }
2961
2962 /* this must be called without a transaction started */
2963 void reiserfs_wait_on_write_block(struct super_block *s)
2964 {
2965         struct reiserfs_journal *journal = SB_JOURNAL(s);
2966         wait_event(journal->j_join_wait,
2967                    !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2968 }
2969
2970 static void queue_log_writer(struct super_block *s)
2971 {
2972         wait_queue_entry_t wait;
2973         struct reiserfs_journal *journal = SB_JOURNAL(s);
2974         set_bit(J_WRITERS_QUEUED, &journal->j_state);
2975
2976         /*
2977          * we don't want to use wait_event here because
2978          * we only want to wait once.
2979          */
2980         init_waitqueue_entry(&wait, current);
2981         add_wait_queue(&journal->j_join_wait, &wait);
2982         set_current_state(TASK_UNINTERRUPTIBLE);
2983         if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2984                 int depth = reiserfs_write_unlock_nested(s);
2985                 schedule();
2986                 reiserfs_write_lock_nested(s, depth);
2987         }
2988         __set_current_state(TASK_RUNNING);
2989         remove_wait_queue(&journal->j_join_wait, &wait);
2990 }
2991
2992 static void wake_queued_writers(struct super_block *s)
2993 {
2994         struct reiserfs_journal *journal = SB_JOURNAL(s);
2995         if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2996                 wake_up(&journal->j_join_wait);
2997 }
2998
2999 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
3000 {
3001         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3002         unsigned long bcount = journal->j_bcount;
3003         while (1) {
3004                 int depth;
3005
3006                 depth = reiserfs_write_unlock_nested(sb);
3007                 schedule_timeout_uninterruptible(1);
3008                 reiserfs_write_lock_nested(sb, depth);
3009
3010                 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
3011                 while ((atomic_read(&journal->j_wcount) > 0 ||
3012                         atomic_read(&journal->j_jlock)) &&
3013                        journal->j_trans_id == trans_id) {
3014                         queue_log_writer(sb);
3015                 }
3016                 if (journal->j_trans_id != trans_id)
3017                         break;
3018                 if (bcount == journal->j_bcount)
3019                         break;
3020                 bcount = journal->j_bcount;
3021         }
3022 }
3023
3024 /*
3025  * join == true if you must join an existing transaction.
3026  * join == false if you can deal with waiting for others to finish
3027  *
3028  * this will block until the transaction is joinable.  send the number of
3029  * blocks you expect to use in nblocks.
3030 */
3031 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3032                               struct super_block *sb, unsigned long nblocks,
3033                               int join)
3034 {
3035         time64_t now = ktime_get_seconds();
3036         unsigned int old_trans_id;
3037         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3038         struct reiserfs_transaction_handle myth;
3039         int retval;
3040         int depth;
3041
3042         reiserfs_check_lock_depth(sb, "journal_begin");
3043         BUG_ON(nblocks > journal->j_trans_max);
3044
3045         PROC_INFO_INC(sb, journal.journal_being);
3046         /* set here for journal_join */
3047         th->t_refcount = 1;
3048         th->t_super = sb;
3049
3050 relock:
3051         lock_journal(sb);
3052         if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3053                 unlock_journal(sb);
3054                 retval = journal->j_errno;
3055                 goto out_fail;
3056         }
3057         journal->j_bcount++;
3058
3059         if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3060                 unlock_journal(sb);
3061                 depth = reiserfs_write_unlock_nested(sb);
3062                 reiserfs_wait_on_write_block(sb);
3063                 reiserfs_write_lock_nested(sb, depth);
3064                 PROC_INFO_INC(sb, journal.journal_relock_writers);
3065                 goto relock;
3066         }
3067         now = ktime_get_seconds();
3068
3069         /*
3070          * if there is no room in the journal OR
3071          * if this transaction is too old, and we weren't called joinable,
3072          * wait for it to finish before beginning we don't sleep if there
3073          * aren't other writers
3074          */
3075
3076         if ((!join && journal->j_must_wait > 0) ||
3077             (!join
3078              && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3079             || (!join && atomic_read(&journal->j_wcount) > 0
3080                 && journal->j_trans_start_time > 0
3081                 && (now - journal->j_trans_start_time) >
3082                 journal->j_max_trans_age) || (!join
3083                                               && atomic_read(&journal->j_jlock))
3084             || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3085
3086                 old_trans_id = journal->j_trans_id;
3087                 /* allow others to finish this transaction */
3088                 unlock_journal(sb);
3089
3090                 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3091                     journal->j_max_batch &&
3092                     ((journal->j_len + nblocks + 2) * 100) <
3093                     (journal->j_len_alloc * 75)) {
3094                         if (atomic_read(&journal->j_wcount) > 10) {
3095                                 queue_log_writer(sb);
3096                                 goto relock;
3097                         }
3098                 }
3099                 /*
3100                  * don't mess with joining the transaction if all we
3101                  * have to do is wait for someone else to do a commit
3102                  */
3103                 if (atomic_read(&journal->j_jlock)) {
3104                         while (journal->j_trans_id == old_trans_id &&
3105                                atomic_read(&journal->j_jlock)) {
3106                                 queue_log_writer(sb);
3107                         }
3108                         goto relock;
3109                 }
3110                 retval = journal_join(&myth, sb);
3111                 if (retval)
3112                         goto out_fail;
3113
3114                 /* someone might have ended the transaction while we joined */
3115                 if (old_trans_id != journal->j_trans_id) {
3116                         retval = do_journal_end(&myth, 0);
3117                 } else {
3118                         retval = do_journal_end(&myth, COMMIT_NOW);
3119                 }
3120
3121                 if (retval)
3122                         goto out_fail;
3123
3124                 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3125                 goto relock;
3126         }
3127         /* we are the first writer, set trans_id */
3128         if (journal->j_trans_start_time == 0) {
3129                 journal->j_trans_start_time = ktime_get_seconds();
3130         }
3131         atomic_inc(&journal->j_wcount);
3132         journal->j_len_alloc += nblocks;
3133         th->t_blocks_logged = 0;
3134         th->t_blocks_allocated = nblocks;
3135         th->t_trans_id = journal->j_trans_id;
3136         unlock_journal(sb);
3137         INIT_LIST_HEAD(&th->t_list);
3138         return 0;
3139
3140 out_fail:
3141         memset(th, 0, sizeof(*th));
3142         /*
3143          * Re-set th->t_super, so we can properly keep track of how many
3144          * persistent transactions there are. We need to do this so if this
3145          * call is part of a failed restart_transaction, we can free it later
3146          */
3147         th->t_super = sb;
3148         return retval;
3149 }
3150
3151 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3152                                                                     super_block
3153                                                                     *s,
3154                                                                     int nblocks)
3155 {
3156         int ret;
3157         struct reiserfs_transaction_handle *th;
3158
3159         /*
3160          * if we're nesting into an existing transaction.  It will be
3161          * persistent on its own
3162          */
3163         if (reiserfs_transaction_running(s)) {
3164                 th = current->journal_info;
3165                 th->t_refcount++;
3166                 BUG_ON(th->t_refcount < 2);
3167
3168                 return th;
3169         }
3170         th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3171         if (!th)
3172                 return NULL;
3173         ret = journal_begin(th, s, nblocks);
3174         if (ret) {
3175                 kfree(th);
3176                 return NULL;
3177         }
3178
3179         SB_JOURNAL(s)->j_persistent_trans++;
3180         return th;
3181 }
3182
3183 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3184 {
3185         struct super_block *s = th->t_super;
3186         int ret = 0;
3187         if (th->t_trans_id)
3188                 ret = journal_end(th);
3189         else
3190                 ret = -EIO;
3191         if (th->t_refcount == 0) {
3192                 SB_JOURNAL(s)->j_persistent_trans--;
3193                 kfree(th);
3194         }
3195         return ret;
3196 }
3197
3198 static int journal_join(struct reiserfs_transaction_handle *th,
3199                         struct super_block *sb)
3200 {
3201         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3202
3203         /*
3204          * this keeps do_journal_end from NULLing out the
3205          * current->journal_info pointer
3206          */
3207         th->t_handle_save = cur_th;
3208         BUG_ON(cur_th && cur_th->t_refcount > 1);
3209         return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3210 }
3211
3212 int journal_join_abort(struct reiserfs_transaction_handle *th,
3213                        struct super_block *sb)
3214 {
3215         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3216
3217         /*
3218          * this keeps do_journal_end from NULLing out the
3219          * current->journal_info pointer
3220          */
3221         th->t_handle_save = cur_th;
3222         BUG_ON(cur_th && cur_th->t_refcount > 1);
3223         return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3224 }
3225
3226 int journal_begin(struct reiserfs_transaction_handle *th,
3227                   struct super_block *sb, unsigned long nblocks)
3228 {
3229         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3230         int ret;
3231
3232         th->t_handle_save = NULL;
3233         if (cur_th) {
3234                 /* we are nesting into the current transaction */
3235                 if (cur_th->t_super == sb) {
3236                         BUG_ON(!cur_th->t_refcount);
3237                         cur_th->t_refcount++;
3238                         memcpy(th, cur_th, sizeof(*th));
3239                         if (th->t_refcount <= 1)
3240                                 reiserfs_warning(sb, "reiserfs-2005",
3241                                                  "BAD: refcount <= 1, but "
3242                                                  "journal_info != 0");
3243                         return 0;
3244                 } else {
3245                         /*
3246                          * we've ended up with a handle from a different
3247                          * filesystem.  save it and restore on journal_end.
3248                          * This should never really happen...
3249                          */
3250                         reiserfs_warning(sb, "clm-2100",
3251                                          "nesting info a different FS");
3252                         th->t_handle_save = current->journal_info;
3253                         current->journal_info = th;
3254                 }
3255         } else {
3256                 current->journal_info = th;
3257         }
3258         ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3259         BUG_ON(current->journal_info != th);
3260
3261         /*
3262          * I guess this boils down to being the reciprocal of clm-2100 above.
3263          * If do_journal_begin_r fails, we need to put it back, since
3264          * journal_end won't be called to do it. */
3265         if (ret)
3266                 current->journal_info = th->t_handle_save;
3267         else
3268                 BUG_ON(!th->t_refcount);
3269
3270         return ret;
3271 }
3272
3273 /*
3274  * puts bh into the current transaction.  If it was already there, reorders
3275  * removes the old pointers from the hash, and puts new ones in (to make
3276  * sure replay happen in the right order).
3277  *
3278  * if it was dirty, cleans and files onto the clean list.  I can't let it
3279  * be dirty again until the transaction is committed.
3280  *
3281  * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3282  */
3283 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3284                        struct buffer_head *bh)
3285 {
3286         struct super_block *sb = th->t_super;
3287         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3288         struct reiserfs_journal_cnode *cn = NULL;
3289         int count_already_incd = 0;
3290         int prepared = 0;
3291         BUG_ON(!th->t_trans_id);
3292
3293         PROC_INFO_INC(sb, journal.mark_dirty);
3294         if (th->t_trans_id != journal->j_trans_id) {
3295                 reiserfs_panic(th->t_super, "journal-1577",
3296                                "handle trans id %ld != current trans id %ld",
3297                                th->t_trans_id, journal->j_trans_id);
3298         }
3299
3300         prepared = test_clear_buffer_journal_prepared(bh);
3301         clear_buffer_journal_restore_dirty(bh);
3302         /* already in this transaction, we are done */
3303         if (buffer_journaled(bh)) {
3304                 PROC_INFO_INC(sb, journal.mark_dirty_already);
3305                 return 0;
3306         }
3307
3308         /*
3309          * this must be turned into a panic instead of a warning.  We can't
3310          * allow a dirty or journal_dirty or locked buffer to be logged, as
3311          * some changes could get to disk too early.  NOT GOOD.
3312          */
3313         if (!prepared || buffer_dirty(bh)) {
3314                 reiserfs_warning(sb, "journal-1777",
3315                                  "buffer %llu bad state "
3316                                  "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3317                                  (unsigned long long)bh->b_blocknr,
3318                                  prepared ? ' ' : '!',
3319                                  buffer_locked(bh) ? ' ' : '!',
3320                                  buffer_dirty(bh) ? ' ' : '!',
3321                                  buffer_journal_dirty(bh) ? ' ' : '!');
3322         }
3323
3324         if (atomic_read(&journal->j_wcount) <= 0) {
3325                 reiserfs_warning(sb, "journal-1409",
3326                                  "returning because j_wcount was %d",
3327                                  atomic_read(&journal->j_wcount));
3328                 return 1;
3329         }
3330         /*
3331          * this error means I've screwed up, and we've overflowed
3332          * the transaction.  Nothing can be done here, except make the
3333          * FS readonly or panic.
3334          */
3335         if (journal->j_len >= journal->j_trans_max) {
3336                 reiserfs_panic(th->t_super, "journal-1413",
3337                                "j_len (%lu) is too big",
3338                                journal->j_len);
3339         }
3340
3341         if (buffer_journal_dirty(bh)) {
3342                 count_already_incd = 1;
3343                 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3344                 clear_buffer_journal_dirty(bh);
3345         }
3346
3347         if (journal->j_len > journal->j_len_alloc) {
3348                 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3349         }
3350
3351         set_buffer_journaled(bh);
3352
3353         /* now put this guy on the end */
3354         if (!cn) {
3355                 cn = get_cnode(sb);
3356                 if (!cn) {
3357                         reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3358                 }
3359
3360                 if (th->t_blocks_logged == th->t_blocks_allocated) {
3361                         th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3362                         journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3363                 }
3364                 th->t_blocks_logged++;
3365                 journal->j_len++;
3366
3367                 cn->bh = bh;
3368                 cn->blocknr = bh->b_blocknr;
3369                 cn->sb = sb;
3370                 cn->jlist = NULL;
3371                 insert_journal_hash(journal->j_hash_table, cn);
3372                 if (!count_already_incd) {
3373                         get_bh(bh);
3374                 }
3375         }
3376         cn->next = NULL;
3377         cn->prev = journal->j_last;
3378         cn->bh = bh;
3379         if (journal->j_last) {
3380                 journal->j_last->next = cn;
3381                 journal->j_last = cn;
3382         } else {
3383                 journal->j_first = cn;
3384                 journal->j_last = cn;
3385         }
3386         reiserfs_schedule_old_flush(sb);
3387         return 0;
3388 }
3389
3390 int journal_end(struct reiserfs_transaction_handle *th)
3391 {
3392         struct super_block *sb = th->t_super;
3393         if (!current->journal_info && th->t_refcount > 1)
3394                 reiserfs_warning(sb, "REISER-NESTING",
3395                                  "th NULL, refcount %d", th->t_refcount);
3396
3397         if (!th->t_trans_id) {
3398                 WARN_ON(1);
3399                 return -EIO;
3400         }
3401
3402         th->t_refcount--;
3403         if (th->t_refcount > 0) {
3404                 struct reiserfs_transaction_handle *cur_th =
3405                     current->journal_info;
3406
3407                 /*
3408                  * we aren't allowed to close a nested transaction on a
3409                  * different filesystem from the one in the task struct
3410                  */
3411                 BUG_ON(cur_th->t_super != th->t_super);
3412
3413                 if (th != cur_th) {
3414                         memcpy(current->journal_info, th, sizeof(*th));
3415                         th->t_trans_id = 0;
3416                 }
3417                 return 0;
3418         } else {
3419                 return do_journal_end(th, 0);
3420         }
3421 }
3422
3423 /*
3424  * removes from the current transaction, relsing and descrementing any counters.
3425  * also files the removed buffer directly onto the clean list
3426  *
3427  * called by journal_mark_freed when a block has been deleted
3428  *
3429  * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3430  */
3431 static int remove_from_transaction(struct super_block *sb,
3432                                    b_blocknr_t blocknr, int already_cleaned)
3433 {
3434         struct buffer_head *bh;
3435         struct reiserfs_journal_cnode *cn;
3436         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3437         int ret = 0;
3438
3439         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3440         if (!cn || !cn->bh) {
3441                 return ret;
3442         }
3443         bh = cn->bh;
3444         if (cn->prev) {
3445                 cn->prev->next = cn->next;
3446         }
3447         if (cn->next) {
3448                 cn->next->prev = cn->prev;
3449         }
3450         if (cn == journal->j_first) {
3451                 journal->j_first = cn->next;
3452         }
3453         if (cn == journal->j_last) {
3454                 journal->j_last = cn->prev;
3455         }
3456         remove_journal_hash(sb, journal->j_hash_table, NULL,
3457                             bh->b_blocknr, 0);
3458         clear_buffer_journaled(bh);     /* don't log this one */
3459
3460         if (!already_cleaned) {
3461                 clear_buffer_journal_dirty(bh);
3462                 clear_buffer_dirty(bh);
3463                 clear_buffer_journal_test(bh);
3464                 put_bh(bh);
3465                 if (atomic_read(&bh->b_count) < 0) {
3466                         reiserfs_warning(sb, "journal-1752",
3467                                          "b_count < 0");
3468                 }
3469                 ret = 1;
3470         }
3471         journal->j_len--;
3472         journal->j_len_alloc--;
3473         free_cnode(sb, cn);
3474         return ret;
3475 }
3476
3477 /*
3478  * for any cnode in a journal list, it can only be dirtied of all the
3479  * transactions that include it are committed to disk.
3480  * this checks through each transaction, and returns 1 if you are allowed
3481  * to dirty, and 0 if you aren't
3482  *
3483  * it is called by dirty_journal_list, which is called after
3484  * flush_commit_list has gotten all the log blocks for a given
3485  * transaction on disk
3486  *
3487  */
3488 static int can_dirty(struct reiserfs_journal_cnode *cn)
3489 {
3490         struct super_block *sb = cn->sb;
3491         b_blocknr_t blocknr = cn->blocknr;
3492         struct reiserfs_journal_cnode *cur = cn->hprev;
3493         int can_dirty = 1;
3494
3495         /*
3496          * first test hprev.  These are all newer than cn, so any node here
3497          * with the same block number and dev means this node can't be sent
3498          * to disk right now.
3499          */
3500         while (cur && can_dirty) {
3501                 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3502                     cur->blocknr == blocknr) {
3503                         can_dirty = 0;
3504                 }
3505                 cur = cur->hprev;
3506         }
3507         /*
3508          * then test hnext.  These are all older than cn.  As long as they
3509          * are committed to the log, it is safe to write cn to disk
3510          */
3511         cur = cn->hnext;
3512         while (cur && can_dirty) {
3513                 if (cur->jlist && cur->jlist->j_len > 0 &&
3514                     atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3515                     cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3516                         can_dirty = 0;
3517                 }
3518                 cur = cur->hnext;
3519         }
3520         return can_dirty;
3521 }
3522
3523 /*
3524  * syncs the commit blocks, but does not force the real buffers to disk
3525  * will wait until the current transaction is done/committed before returning
3526  */
3527 int journal_end_sync(struct reiserfs_transaction_handle *th)
3528 {
3529         struct super_block *sb = th->t_super;
3530         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3531
3532         BUG_ON(!th->t_trans_id);
3533         /* you can sync while nested, very, very bad */
3534         BUG_ON(th->t_refcount > 1);
3535         if (journal->j_len == 0) {
3536                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3537                                              1);
3538                 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3539         }
3540         return do_journal_end(th, COMMIT_NOW | WAIT);
3541 }
3542
3543 /* writeback the pending async commits to disk */
3544 static void flush_async_commits(struct work_struct *work)
3545 {
3546         struct reiserfs_journal *journal =
3547                 container_of(work, struct reiserfs_journal, j_work.work);
3548         struct super_block *sb = journal->j_work_sb;
3549         struct reiserfs_journal_list *jl;
3550         struct list_head *entry;
3551
3552         reiserfs_write_lock(sb);
3553         if (!list_empty(&journal->j_journal_list)) {
3554                 /* last entry is the youngest, commit it and you get everything */
3555                 entry = journal->j_journal_list.prev;
3556                 jl = JOURNAL_LIST_ENTRY(entry);
3557                 flush_commit_list(sb, jl, 1);
3558         }
3559         reiserfs_write_unlock(sb);
3560 }
3561
3562 /*
3563  * flushes any old transactions to disk
3564  * ends the current transaction if it is too old
3565  */
3566 void reiserfs_flush_old_commits(struct super_block *sb)
3567 {
3568         time64_t now;
3569         struct reiserfs_transaction_handle th;
3570         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3571
3572         now = ktime_get_seconds();
3573         /*
3574          * safety check so we don't flush while we are replaying the log during
3575          * mount
3576          */
3577         if (list_empty(&journal->j_journal_list))
3578                 return;
3579
3580         /*
3581          * check the current transaction.  If there are no writers, and it is
3582          * too old, finish it, and force the commit blocks to disk
3583          */
3584         if (atomic_read(&journal->j_wcount) <= 0 &&
3585             journal->j_trans_start_time > 0 &&
3586             journal->j_len > 0 &&
3587             (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3588                 if (!journal_join(&th, sb)) {
3589                         reiserfs_prepare_for_journal(sb,
3590                                                      SB_BUFFER_WITH_SB(sb),
3591                                                      1);
3592                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3593
3594                         /*
3595                          * we're only being called from kreiserfsd, it makes
3596                          * no sense to do an async commit so that kreiserfsd
3597                          * can do it later
3598                          */
3599                         do_journal_end(&th, COMMIT_NOW | WAIT);
3600                 }
3601         }
3602 }
3603
3604 /*
3605  * returns 0 if do_journal_end should return right away, returns 1 if
3606  * do_journal_end should finish the commit
3607  *
3608  * if the current transaction is too old, but still has writers, this will
3609  * wait on j_join_wait until all the writers are done.  By the time it
3610  * wakes up, the transaction it was called has already ended, so it just
3611  * flushes the commit list and returns 0.
3612  *
3613  * Won't batch when flush or commit_now is set.  Also won't batch when
3614  * others are waiting on j_join_wait.
3615  *
3616  * Note, we can't allow the journal_end to proceed while there are still
3617  * writers in the log.
3618  */
3619 static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3620 {
3621
3622         time64_t now;
3623         int flush = flags & FLUSH_ALL;
3624         int commit_now = flags & COMMIT_NOW;
3625         int wait_on_commit = flags & WAIT;
3626         struct reiserfs_journal_list *jl;
3627         struct super_block *sb = th->t_super;
3628         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3629
3630         BUG_ON(!th->t_trans_id);
3631
3632         if (th->t_trans_id != journal->j_trans_id) {
3633                 reiserfs_panic(th->t_super, "journal-1577",
3634                                "handle trans id %ld != current trans id %ld",
3635                                th->t_trans_id, journal->j_trans_id);
3636         }
3637
3638         journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3639         /* <= 0 is allowed.  unmounting might not call begin */
3640         if (atomic_read(&journal->j_wcount) > 0)
3641                 atomic_dec(&journal->j_wcount);
3642
3643         /*
3644          * BUG, deal with case where j_len is 0, but people previously
3645          * freed blocks need to be released will be dealt with by next
3646          * transaction that actually writes something, but should be taken
3647          * care of in this trans
3648          */
3649         BUG_ON(journal->j_len == 0);
3650
3651         /*
3652          * if wcount > 0, and we are called to with flush or commit_now,
3653          * we wait on j_join_wait.  We will wake up when the last writer has
3654          * finished the transaction, and started it on its way to the disk.
3655          * Then, we flush the commit or journal list, and just return 0
3656          * because the rest of journal end was already done for this
3657          * transaction.
3658          */
3659         if (atomic_read(&journal->j_wcount) > 0) {
3660                 if (flush || commit_now) {
3661                         unsigned trans_id;
3662
3663                         jl = journal->j_current_jl;
3664                         trans_id = jl->j_trans_id;
3665                         if (wait_on_commit)
3666                                 jl->j_state |= LIST_COMMIT_PENDING;
3667                         atomic_set(&journal->j_jlock, 1);
3668                         if (flush) {
3669                                 journal->j_next_full_flush = 1;
3670                         }
3671                         unlock_journal(sb);
3672
3673                         /*
3674                          * sleep while the current transaction is
3675                          * still j_jlocked
3676                          */
3677                         while (journal->j_trans_id == trans_id) {
3678                                 if (atomic_read(&journal->j_jlock)) {
3679                                         queue_log_writer(sb);
3680                                 } else {
3681                                         lock_journal(sb);
3682                                         if (journal->j_trans_id == trans_id) {
3683                                                 atomic_set(&journal->j_jlock,
3684                                                            1);
3685                                         }
3686                                         unlock_journal(sb);
3687                                 }
3688                         }
3689                         BUG_ON(journal->j_trans_id == trans_id);
3690
3691                         if (commit_now
3692                             && journal_list_still_alive(sb, trans_id)
3693                             && wait_on_commit) {
3694                                 flush_commit_list(sb, jl, 1);
3695                         }
3696                         return 0;
3697                 }
3698                 unlock_journal(sb);
3699                 return 0;
3700         }
3701
3702         /* deal with old transactions where we are the last writers */
3703         now = ktime_get_seconds();
3704         if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3705                 commit_now = 1;
3706                 journal->j_next_async_flush = 1;
3707         }
3708         /* don't batch when someone is waiting on j_join_wait */
3709         /* don't batch when syncing the commit or flushing the whole trans */
3710         if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3711             && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3712             && journal->j_len_alloc < journal->j_max_batch
3713             && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3714                 journal->j_bcount++;
3715                 unlock_journal(sb);
3716                 return 0;
3717         }
3718
3719         if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3720                 reiserfs_panic(sb, "journal-003",
3721                                "j_start (%ld) is too high",
3722                                journal->j_start);
3723         }
3724         return 1;
3725 }
3726
3727 /*
3728  * Does all the work that makes deleting blocks safe.
3729  * when deleting a block mark BH_JNew, just remove it from the current
3730  * transaction, clean it's buffer_head and move on.
3731  *
3732  * otherwise:
3733  * set a bit for the block in the journal bitmap.  That will prevent it from
3734  * being allocated for unformatted nodes before this transaction has finished.
3735  *
3736  * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3737  * That will prevent any old transactions with this block from trying to flush
3738  * to the real location.  Since we aren't removing the cnode from the
3739  * journal_list_hash, *the block can't be reallocated yet.
3740  *
3741  * Then remove it from the current transaction, decrementing any counters and
3742  * filing it on the clean list.
3743  */
3744 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3745                        struct super_block *sb, b_blocknr_t blocknr)
3746 {
3747         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3748         struct reiserfs_journal_cnode *cn = NULL;
3749         struct buffer_head *bh = NULL;
3750         struct reiserfs_list_bitmap *jb = NULL;
3751         int cleaned = 0;
3752         BUG_ON(!th->t_trans_id);
3753
3754         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3755         if (cn && cn->bh) {
3756                 bh = cn->bh;
3757                 get_bh(bh);
3758         }
3759         /* if it is journal new, we just remove it from this transaction */
3760         if (bh && buffer_journal_new(bh)) {
3761                 clear_buffer_journal_new(bh);
3762                 clear_prepared_bits(bh);
3763                 reiserfs_clean_and_file_buffer(bh);
3764                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3765         } else {
3766                 /*
3767                  * set the bit for this block in the journal bitmap
3768                  * for this transaction
3769                  */
3770                 jb = journal->j_current_jl->j_list_bitmap;
3771                 if (!jb) {
3772                         reiserfs_panic(sb, "journal-1702",
3773                                        "journal_list_bitmap is NULL");
3774                 }
3775                 set_bit_in_list_bitmap(sb, blocknr, jb);
3776
3777                 /* Note, the entire while loop is not allowed to schedule.  */
3778
3779                 if (bh) {
3780                         clear_prepared_bits(bh);
3781                         reiserfs_clean_and_file_buffer(bh);
3782                 }
3783                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3784
3785                 /*
3786                  * find all older transactions with this block,
3787                  * make sure they don't try to write it out
3788                  */
3789                 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3790                                           blocknr);
3791                 while (cn) {
3792                         if (sb == cn->sb && blocknr == cn->blocknr) {
3793                                 set_bit(BLOCK_FREED, &cn->state);
3794                                 if (cn->bh) {
3795                                         /*
3796                                          * remove_from_transaction will brelse
3797                                          * the buffer if it was in the current
3798                                          * trans
3799                                          */
3800                                         if (!cleaned) {
3801                                                 clear_buffer_journal_dirty(cn->
3802                                                                            bh);
3803                                                 clear_buffer_dirty(cn->bh);
3804                                                 clear_buffer_journal_test(cn->
3805                                                                           bh);
3806                                                 cleaned = 1;
3807                                                 put_bh(cn->bh);
3808                                                 if (atomic_read
3809                                                     (&cn->bh->b_count) < 0) {
3810                                                         reiserfs_warning(sb,
3811                                                                  "journal-2138",
3812                                                                  "cn->bh->b_count < 0");
3813                                                 }
3814                                         }
3815                                         /*
3816                                          * since we are clearing the bh,
3817                                          * we MUST dec nonzerolen
3818                                          */
3819                                         if (cn->jlist) {
3820                                                 atomic_dec(&cn->jlist->
3821                                                            j_nonzerolen);
3822                                         }
3823                                         cn->bh = NULL;
3824                                 }
3825                         }
3826                         cn = cn->hnext;
3827                 }
3828         }
3829
3830         if (bh)
3831                 release_buffer_page(bh); /* get_hash grabs the buffer */
3832         return 0;
3833 }
3834
3835 void reiserfs_update_inode_transaction(struct inode *inode)
3836 {
3837         struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3838         REISERFS_I(inode)->i_jl = journal->j_current_jl;
3839         REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3840 }
3841
3842 /*
3843  * returns -1 on error, 0 if no commits/barriers were done and 1
3844  * if a transaction was actually committed and the barrier was done
3845  */
3846 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3847                              struct reiserfs_journal_list *jl)
3848 {
3849         struct reiserfs_transaction_handle th;
3850         struct super_block *sb = inode->i_sb;
3851         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3852         int ret = 0;
3853
3854         /*
3855          * is it from the current transaction,
3856          * or from an unknown transaction?
3857          */
3858         if (id == journal->j_trans_id) {
3859                 jl = journal->j_current_jl;
3860                 /*
3861                  * try to let other writers come in and
3862                  * grow this transaction
3863                  */
3864                 let_transaction_grow(sb, id);
3865                 if (journal->j_trans_id != id) {
3866                         goto flush_commit_only;
3867                 }
3868
3869                 ret = journal_begin(&th, sb, 1);
3870                 if (ret)
3871                         return ret;
3872
3873                 /* someone might have ended this transaction while we joined */
3874                 if (journal->j_trans_id != id) {
3875                         reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3876                                                      1);
3877                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3878                         ret = journal_end(&th);
3879                         goto flush_commit_only;
3880                 }
3881
3882                 ret = journal_end_sync(&th);
3883                 if (!ret)
3884                         ret = 1;
3885
3886         } else {
3887                 /*
3888                  * this gets tricky, we have to make sure the journal list in
3889                  * the inode still exists.  We know the list is still around
3890                  * if we've got a larger transaction id than the oldest list
3891                  */
3892 flush_commit_only:
3893                 if (journal_list_still_alive(inode->i_sb, id)) {
3894                         /*
3895                          * we only set ret to 1 when we know for sure
3896                          * the barrier hasn't been started yet on the commit
3897                          * block.
3898                          */
3899                         if (atomic_read(&jl->j_commit_left) > 1)
3900                                 ret = 1;
3901                         flush_commit_list(sb, jl, 1);
3902                         if (journal->j_errno)
3903                                 ret = journal->j_errno;
3904                 }
3905         }
3906         /* otherwise the list is gone, and long since committed */
3907         return ret;
3908 }
3909
3910 int reiserfs_commit_for_inode(struct inode *inode)
3911 {
3912         unsigned int id = REISERFS_I(inode)->i_trans_id;
3913         struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3914
3915         /*
3916          * for the whole inode, assume unset id means it was
3917          * changed in the current transaction.  More conservative
3918          */
3919         if (!id || !jl) {
3920                 reiserfs_update_inode_transaction(inode);
3921                 id = REISERFS_I(inode)->i_trans_id;
3922                 /* jl will be updated in __commit_trans_jl */
3923         }
3924
3925         return __commit_trans_jl(inode, id, jl);
3926 }
3927
3928 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3929                                       struct buffer_head *bh)
3930 {
3931         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3932         PROC_INFO_INC(sb, journal.restore_prepared);
3933         if (!bh) {
3934                 return;
3935         }
3936         if (test_clear_buffer_journal_restore_dirty(bh) &&
3937             buffer_journal_dirty(bh)) {
3938                 struct reiserfs_journal_cnode *cn;
3939                 reiserfs_write_lock(sb);
3940                 cn = get_journal_hash_dev(sb,
3941                                           journal->j_list_hash_table,
3942                                           bh->b_blocknr);
3943                 if (cn && can_dirty(cn)) {
3944                         set_buffer_journal_test(bh);
3945                         mark_buffer_dirty(bh);
3946                 }
3947                 reiserfs_write_unlock(sb);
3948         }
3949         clear_buffer_journal_prepared(bh);
3950 }
3951
3952 extern struct tree_balance *cur_tb;
3953 /*
3954  * before we can change a metadata block, we have to make sure it won't
3955  * be written to disk while we are altering it.  So, we must:
3956  * clean it
3957  * wait on it.
3958  */
3959 int reiserfs_prepare_for_journal(struct super_block *sb,
3960                                  struct buffer_head *bh, int wait)
3961 {
3962         PROC_INFO_INC(sb, journal.prepare);
3963
3964         if (!trylock_buffer(bh)) {
3965                 if (!wait)
3966                         return 0;
3967                 lock_buffer(bh);
3968         }
3969         set_buffer_journal_prepared(bh);
3970         if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3971                 clear_buffer_journal_test(bh);
3972                 set_buffer_journal_restore_dirty(bh);
3973         }
3974         unlock_buffer(bh);
3975         return 1;
3976 }
3977
3978 /*
3979  * long and ugly.  If flush, will not return until all commit
3980  * blocks and all real buffers in the trans are on disk.
3981  * If no_async, won't return until all commit blocks are on disk.
3982  *
3983  * keep reading, there are comments as you go along
3984  *
3985  * If the journal is aborted, we just clean up. Things like flushing
3986  * journal lists, etc just won't happen.
3987  */
3988 static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3989 {
3990         struct super_block *sb = th->t_super;
3991         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3992         struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3993         struct reiserfs_journal_cnode *last_cn = NULL;
3994         struct reiserfs_journal_desc *desc;
3995         struct reiserfs_journal_commit *commit;
3996         struct buffer_head *c_bh;       /* commit bh */
3997         struct buffer_head *d_bh;       /* desc bh */
3998         int cur_write_start = 0;        /* start index of current log write */
3999         int i;
4000         int flush;
4001         int wait_on_commit;
4002         struct reiserfs_journal_list *jl, *temp_jl;
4003         struct list_head *entry, *safe;
4004         unsigned long jindex;
4005         unsigned int commit_trans_id;
4006         int trans_half;
4007         int depth;
4008
4009         BUG_ON(th->t_refcount > 1);
4010         BUG_ON(!th->t_trans_id);
4011         BUG_ON(!th->t_super);
4012
4013         /*
4014          * protect flush_older_commits from doing mistakes if the
4015          * transaction ID counter gets overflowed.
4016          */
4017         if (th->t_trans_id == ~0U)
4018                 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4019         flush = flags & FLUSH_ALL;
4020         wait_on_commit = flags & WAIT;
4021
4022         current->journal_info = th->t_handle_save;
4023         reiserfs_check_lock_depth(sb, "journal end");
4024         if (journal->j_len == 0) {
4025                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4026                                              1);
4027                 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4028         }
4029
4030         lock_journal(sb);
4031         if (journal->j_next_full_flush) {
4032                 flags |= FLUSH_ALL;
4033                 flush = 1;
4034         }
4035         if (journal->j_next_async_flush) {
4036                 flags |= COMMIT_NOW | WAIT;
4037                 wait_on_commit = 1;
4038         }
4039
4040         /*
4041          * check_journal_end locks the journal, and unlocks if it does
4042          * not return 1 it tells us if we should continue with the
4043          * journal_end, or just return
4044          */
4045         if (!check_journal_end(th, flags)) {
4046                 reiserfs_schedule_old_flush(sb);
4047                 wake_queued_writers(sb);
4048                 reiserfs_async_progress_wait(sb);
4049                 goto out;
4050         }
4051
4052         /* check_journal_end might set these, check again */
4053         if (journal->j_next_full_flush) {
4054                 flush = 1;
4055         }
4056
4057         /*
4058          * j must wait means we have to flush the log blocks, and the
4059          * real blocks for this transaction
4060          */
4061         if (journal->j_must_wait > 0) {
4062                 flush = 1;
4063         }
4064 #ifdef REISERFS_PREALLOCATE
4065         /*
4066          * quota ops might need to nest, setup the journal_info pointer
4067          * for them and raise the refcount so that it is > 0.
4068          */
4069         current->journal_info = th;
4070         th->t_refcount++;
4071
4072         /* it should not involve new blocks into the transaction */
4073         reiserfs_discard_all_prealloc(th);
4074
4075         th->t_refcount--;
4076         current->journal_info = th->t_handle_save;
4077 #endif
4078
4079         /* setup description block */
4080         d_bh =
4081             journal_getblk(sb,
4082                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4083                            journal->j_start);
4084         set_buffer_uptodate(d_bh);
4085         desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4086         memset(d_bh->b_data, 0, d_bh->b_size);
4087         memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4088         set_desc_trans_id(desc, journal->j_trans_id);
4089
4090         /*
4091          * setup commit block.  Don't write (keep it clean too) this one
4092          * until after everyone else is written
4093          */
4094         c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4095                               ((journal->j_start + journal->j_len +
4096                                 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4097         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4098         memset(c_bh->b_data, 0, c_bh->b_size);
4099         set_commit_trans_id(commit, journal->j_trans_id);
4100         set_buffer_uptodate(c_bh);
4101
4102         /* init this journal list */
4103         jl = journal->j_current_jl;
4104
4105         /*
4106          * we lock the commit before doing anything because
4107          * we want to make sure nobody tries to run flush_commit_list until
4108          * the new transaction is fully setup, and we've already flushed the
4109          * ordered bh list
4110          */
4111         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4112
4113         /* save the transaction id in case we need to commit it later */
4114         commit_trans_id = jl->j_trans_id;
4115
4116         atomic_set(&jl->j_older_commits_done, 0);
4117         jl->j_trans_id = journal->j_trans_id;
4118         jl->j_timestamp = journal->j_trans_start_time;
4119         jl->j_commit_bh = c_bh;
4120         jl->j_start = journal->j_start;
4121         jl->j_len = journal->j_len;
4122         atomic_set(&jl->j_nonzerolen, journal->j_len);
4123         atomic_set(&jl->j_commit_left, journal->j_len + 2);
4124         jl->j_realblock = NULL;
4125
4126         /*
4127          * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4128          * for each real block, add it to the journal list hash,
4129          * copy into real block index array in the commit or desc block
4130          */
4131         trans_half = journal_trans_half(sb->s_blocksize);
4132         for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4133                 if (buffer_journaled(cn->bh)) {
4134                         jl_cn = get_cnode(sb);
4135                         if (!jl_cn) {
4136                                 reiserfs_panic(sb, "journal-1676",
4137                                                "get_cnode returned NULL");
4138                         }
4139                         if (i == 0) {
4140                                 jl->j_realblock = jl_cn;
4141                         }
4142                         jl_cn->prev = last_cn;
4143                         jl_cn->next = NULL;
4144                         if (last_cn) {
4145                                 last_cn->next = jl_cn;
4146                         }
4147                         last_cn = jl_cn;
4148                         /*
4149                          * make sure the block we are trying to log
4150                          * is not a block of journal or reserved area
4151                          */
4152                         if (is_block_in_log_or_reserved_area
4153                             (sb, cn->bh->b_blocknr)) {
4154                                 reiserfs_panic(sb, "journal-2332",
4155                                                "Trying to log block %lu, "
4156                                                "which is a log block",
4157                                                cn->bh->b_blocknr);
4158                         }
4159                         jl_cn->blocknr = cn->bh->b_blocknr;
4160                         jl_cn->state = 0;
4161                         jl_cn->sb = sb;
4162                         jl_cn->bh = cn->bh;
4163                         jl_cn->jlist = jl;
4164                         insert_journal_hash(journal->j_list_hash_table, jl_cn);
4165                         if (i < trans_half) {
4166                                 desc->j_realblock[i] =
4167                                     cpu_to_le32(cn->bh->b_blocknr);
4168                         } else {
4169                                 commit->j_realblock[i - trans_half] =
4170                                     cpu_to_le32(cn->bh->b_blocknr);
4171                         }
4172                 } else {
4173                         i--;
4174                 }
4175         }
4176         set_desc_trans_len(desc, journal->j_len);
4177         set_desc_mount_id(desc, journal->j_mount_id);
4178         set_desc_trans_id(desc, journal->j_trans_id);
4179         set_commit_trans_len(commit, journal->j_len);
4180
4181         /*
4182          * special check in case all buffers in the journal
4183          * were marked for not logging
4184          */
4185         BUG_ON(journal->j_len == 0);
4186
4187         /*
4188          * we're about to dirty all the log blocks, mark the description block
4189          * dirty now too.  Don't mark the commit block dirty until all the
4190          * others are on disk
4191          */
4192         mark_buffer_dirty(d_bh);
4193
4194         /*
4195          * first data block is j_start + 1, so add one to
4196          * cur_write_start wherever you use it
4197          */
4198         cur_write_start = journal->j_start;
4199         cn = journal->j_first;
4200         jindex = 1;     /* start at one so we don't get the desc again */
4201         while (cn) {
4202                 clear_buffer_journal_new(cn->bh);
4203                 /* copy all the real blocks into log area.  dirty log blocks */
4204                 if (buffer_journaled(cn->bh)) {
4205                         struct buffer_head *tmp_bh;
4206                         char *addr;
4207                         struct page *page;
4208                         tmp_bh =
4209                             journal_getblk(sb,
4210                                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4211                                            ((cur_write_start +
4212                                              jindex) %
4213                                             SB_ONDISK_JOURNAL_SIZE(sb)));
4214                         set_buffer_uptodate(tmp_bh);
4215                         page = cn->bh->b_page;
4216                         addr = kmap(page);
4217                         memcpy(tmp_bh->b_data,
4218                                addr + offset_in_page(cn->bh->b_data),
4219                                cn->bh->b_size);
4220                         kunmap(page);
4221                         mark_buffer_dirty(tmp_bh);
4222                         jindex++;
4223                         set_buffer_journal_dirty(cn->bh);
4224                         clear_buffer_journaled(cn->bh);
4225                 } else {
4226                         /*
4227                          * JDirty cleared sometime during transaction.
4228                          * don't log this one
4229                          */
4230                         reiserfs_warning(sb, "journal-2048",
4231                                          "BAD, buffer in journal hash, "
4232                                          "but not JDirty!");
4233                         brelse(cn->bh);
4234                 }
4235                 next = cn->next;
4236                 free_cnode(sb, cn);
4237                 cn = next;
4238                 reiserfs_cond_resched(sb);
4239         }
4240
4241         /*
4242          * we are done with both the c_bh and d_bh, but
4243          * c_bh must be written after all other commit blocks,
4244          * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4245          */
4246
4247         journal->j_current_jl = alloc_journal_list(sb);
4248
4249         /* now it is safe to insert this transaction on the main list */
4250         list_add_tail(&jl->j_list, &journal->j_journal_list);
4251         list_add_tail(&jl->j_working_list, &journal->j_working_list);
4252         journal->j_num_work_lists++;
4253
4254         /* reset journal values for the next transaction */
4255         journal->j_start =
4256             (journal->j_start + journal->j_len +
4257              2) % SB_ONDISK_JOURNAL_SIZE(sb);
4258         atomic_set(&journal->j_wcount, 0);
4259         journal->j_bcount = 0;
4260         journal->j_last = NULL;
4261         journal->j_first = NULL;
4262         journal->j_len = 0;
4263         journal->j_trans_start_time = 0;
4264         /* check for trans_id overflow */
4265         if (++journal->j_trans_id == 0)
4266                 journal->j_trans_id = 10;
4267         journal->j_current_jl->j_trans_id = journal->j_trans_id;
4268         journal->j_must_wait = 0;
4269         journal->j_len_alloc = 0;
4270         journal->j_next_full_flush = 0;
4271         journal->j_next_async_flush = 0;
4272         init_journal_hash(sb);
4273
4274         /*
4275          * make sure reiserfs_add_jh sees the new current_jl before we
4276          * write out the tails
4277          */
4278         smp_mb();
4279
4280         /*
4281          * tail conversion targets have to hit the disk before we end the
4282          * transaction.  Otherwise a later transaction might repack the tail
4283          * before this transaction commits, leaving the data block unflushed
4284          * and clean, if we crash before the later transaction commits, the
4285          * data block is lost.
4286          */
4287         if (!list_empty(&jl->j_tail_bh_list)) {
4288                 depth = reiserfs_write_unlock_nested(sb);
4289                 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4290                                       journal, jl, &jl->j_tail_bh_list);
4291                 reiserfs_write_lock_nested(sb, depth);
4292         }
4293         BUG_ON(!list_empty(&jl->j_tail_bh_list));
4294         mutex_unlock(&jl->j_commit_mutex);
4295
4296         /*
4297          * honor the flush wishes from the caller, simple commits can
4298          * be done outside the journal lock, they are done below
4299          *
4300          * if we don't flush the commit list right now, we put it into
4301          * the work queue so the people waiting on the async progress work
4302          * queue don't wait for this proc to flush journal lists and such.
4303          */
4304         if (flush) {
4305                 flush_commit_list(sb, jl, 1);
4306                 flush_journal_list(sb, jl, 1);
4307         } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4308                 /*
4309                  * Avoid queueing work when sb is being shut down. Transaction
4310                  * will be flushed on journal shutdown.
4311                  */
4312                 if (sb->s_flags & SB_ACTIVE)
4313                         queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4314                                            &journal->j_work, HZ / 10);
4315         }
4316
4317         /*
4318          * if the next transaction has any chance of wrapping, flush
4319          * transactions that might get overwritten.  If any journal lists
4320          * are very old flush them as well.
4321          */
4322 first_jl:
4323         list_for_each_safe(entry, safe, &journal->j_journal_list) {
4324                 temp_jl = JOURNAL_LIST_ENTRY(entry);
4325                 if (journal->j_start <= temp_jl->j_start) {
4326                         if ((journal->j_start + journal->j_trans_max + 1) >=
4327                             temp_jl->j_start) {
4328                                 flush_used_journal_lists(sb, temp_jl);
4329                                 goto first_jl;
4330                         } else if ((journal->j_start +
4331                                     journal->j_trans_max + 1) <
4332                                    SB_ONDISK_JOURNAL_SIZE(sb)) {
4333                                 /*
4334                                  * if we don't cross into the next
4335                                  * transaction and we don't wrap, there is
4336                                  * no way we can overlap any later transactions
4337                                  * break now
4338                                  */
4339                                 break;
4340                         }
4341                 } else if ((journal->j_start +
4342                             journal->j_trans_max + 1) >
4343                            SB_ONDISK_JOURNAL_SIZE(sb)) {
4344                         if (((journal->j_start + journal->j_trans_max + 1) %
4345                              SB_ONDISK_JOURNAL_SIZE(sb)) >=
4346                             temp_jl->j_start) {
4347                                 flush_used_journal_lists(sb, temp_jl);
4348                                 goto first_jl;
4349                         } else {
4350                                 /*
4351                                 * we don't overlap anything from out start
4352                                 * to the end of the log, and our wrapped
4353                                 * portion doesn't overlap anything at
4354                                 * the start of the log.  We can break
4355                                 */
4356                                 break;
4357                         }
4358                 }
4359         }
4360
4361         journal->j_current_jl->j_list_bitmap =
4362             get_list_bitmap(sb, journal->j_current_jl);
4363
4364         if (!(journal->j_current_jl->j_list_bitmap)) {
4365                 reiserfs_panic(sb, "journal-1996",
4366                                "could not get a list bitmap");
4367         }
4368
4369         atomic_set(&journal->j_jlock, 0);
4370         unlock_journal(sb);
4371         /* wake up any body waiting to join. */
4372         clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4373         wake_up(&journal->j_join_wait);
4374
4375         if (!flush && wait_on_commit &&
4376             journal_list_still_alive(sb, commit_trans_id)) {
4377                 flush_commit_list(sb, jl, 1);
4378         }
4379 out:
4380         reiserfs_check_lock_depth(sb, "journal end2");
4381
4382         memset(th, 0, sizeof(*th));
4383         /*
4384          * Re-set th->t_super, so we can properly keep track of how many
4385          * persistent transactions there are. We need to do this so if this
4386          * call is part of a failed restart_transaction, we can free it later
4387          */
4388         th->t_super = sb;
4389
4390         return journal->j_errno;
4391 }
4392
4393 /* Send the file system read only and refuse new transactions */
4394 void reiserfs_abort_journal(struct super_block *sb, int errno)
4395 {
4396         struct reiserfs_journal *journal = SB_JOURNAL(sb);
4397         if (test_bit(J_ABORTED, &journal->j_state))
4398                 return;
4399
4400         if (!journal->j_errno)
4401                 journal->j_errno = errno;
4402
4403         sb->s_flags |= SB_RDONLY;
4404         set_bit(J_ABORTED, &journal->j_state);
4405
4406 #ifdef CONFIG_REISERFS_CHECK
4407         dump_stack();
4408 #endif
4409 }