fs/affs/inode.c

   1 /*
   2  *  linux/fs/affs/inode.c
   3  *
   4  *  (c) 1996  Hans-Joachim Widmaier - Rewritten
   5  *
   6  *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
   7  *
   8  *  (C) 1992  Eric Youngdale Modified for ISO9660 filesystem.
   9  *
  10  *  (C) 1991  Linus Torvalds - minix filesystem
  11  */
  12 #include <linux/sched.h>
  13 #include <linux/gfp.h>
  14 #include "affs.h"
  15
  16 extern const struct inode_operations affs_symlink_inode_operations;
  17 extern struct timezone sys_tz;
  18
  19 struct inode *affs_iget(struct super_block *sb, unsigned long ino)
  20 {
  21         struct affs_sb_info     *sbi = AFFS_SB(sb);
  22         struct buffer_head      *bh;
  23         struct affs_head        *head;
  24         struct affs_tail        *tail;
  25         struct inode            *inode;
  26         u32                      block;
  27         u32                      size;
  28         u32                      prot;
  29         u16                      id;
  30
  31         inode = iget_locked(sb, ino);
  32         if (!inode)
  33                 return ERR_PTR(-ENOMEM);
  34         if (!(inode->i_state & I_NEW))
  35                 return inode;
  36
  37         pr_debug("AFFS: affs_iget(%lu)\n", inode->i_ino);
  38
  39         block = inode->i_ino;
  40         bh = affs_bread(sb, block);
  41         if (!bh) {
  42                 affs_warning(sb, "read_inode", "Cannot read block %d", block);
  43                 goto bad_inode;
  44         }
  45         if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
  46                 affs_warning(sb,"read_inode",
  47                            "Checksum or type (ptype=%d) error on inode %d",
  48                            AFFS_HEAD(bh)->ptype, block);
  49                 goto bad_inode;
  50         }
  51
  52         head = AFFS_HEAD(bh);
  53         tail = AFFS_TAIL(sb, bh);
  54         prot = be32_to_cpu(tail->protect);
  55
  56         inode->i_size = 0;
  57         set_nlink(inode, 1);
  58         inode->i_mode = 0;
  59         AFFS_I(inode)->i_extcnt = 1;
  60         AFFS_I(inode)->i_ext_last = ~1;
  61         AFFS_I(inode)->i_protect = prot;
  62         atomic_set(&AFFS_I(inode)->i_opencnt, 0);
  63         AFFS_I(inode)->i_blkcnt = 0;
  64         AFFS_I(inode)->i_lc = NULL;
  65         AFFS_I(inode)->i_lc_size = 0;
  66         AFFS_I(inode)->i_lc_shift = 0;
  67         AFFS_I(inode)->i_lc_mask = 0;
  68         AFFS_I(inode)->i_ac = NULL;
  69         AFFS_I(inode)->i_ext_bh = NULL;
  70         AFFS_I(inode)->mmu_private = 0;
  71         AFFS_I(inode)->i_lastalloc = 0;
  72         AFFS_I(inode)->i_pa_cnt = 0;
  73
  74         if (sbi->s_flags & SF_SETMODE)
  75                 inode->i_mode = sbi->s_mode;
  76         else
  77                 inode->i_mode = prot_to_mode(prot);
  78
  79         id = be16_to_cpu(tail->uid);
  80         if (id == 0 || sbi->s_flags & SF_SETUID)
  81                 inode->i_uid = sbi->s_uid;
  82         else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
  83                 inode->i_uid = 0;
  84         else
  85                 inode->i_uid = id;
  86
  87         id = be16_to_cpu(tail->gid);
  88         if (id == 0 || sbi->s_flags & SF_SETGID)
  89                 inode->i_gid = sbi->s_gid;
  90         else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
  91                 inode->i_gid = 0;
  92         else
  93                 inode->i_gid = id;
  94
  95         switch (be32_to_cpu(tail->stype)) {
  96         case ST_ROOT:
  97                 inode->i_uid = sbi->s_uid;
  98                 inode->i_gid = sbi->s_gid;
  99                 /* fall through */
 100         case ST_USERDIR:
 101                 if (be32_to_cpu(tail->stype) == ST_USERDIR ||
 102                     sbi->s_flags & SF_SETMODE) {
 103                         if (inode->i_mode & S_IRUSR)
 104                                 inode->i_mode |= S_IXUSR;
 105                         if (inode->i_mode & S_IRGRP)
 106                                 inode->i_mode |= S_IXGRP;
 107                         if (inode->i_mode & S_IROTH)
 108                                 inode->i_mode |= S_IXOTH;
 109                         inode->i_mode |= S_IFDIR;
 110                 } else
 111                         inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
 112                 /* Maybe it should be controlled by mount parameter? */
 113                 //inode->i_mode |= S_ISVTX;
 114                 inode->i_op = &affs_dir_inode_operations;
 115                 inode->i_fop = &affs_dir_operations;
 116                 break;
 117         case ST_LINKDIR:
 118 #if 0
 119                 affs_warning(sb, "read_inode", "inode is LINKDIR");
 120                 goto bad_inode;
 121 #else
 122                 inode->i_mode |= S_IFDIR;
 123                 /* ... and leave ->i_op and ->i_fop pointing to empty */
 124                 break;
 125 #endif
 126         case ST_LINKFILE:
 127                 affs_warning(sb, "read_inode", "inode is LINKFILE");
 128                 goto bad_inode;
 129         case ST_FILE:
 130                 size = be32_to_cpu(tail->size);
 131                 inode->i_mode |= S_IFREG;
 132                 AFFS_I(inode)->mmu_private = inode->i_size = size;
 133                 if (inode->i_size) {
 134                         AFFS_I(inode)->i_blkcnt = (size - 1) /
 135                                                sbi->s_data_blksize + 1;
 136                         AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
 137                                                sbi->s_hashsize + 1;
 138                 }
 139                 if (tail->link_chain)
 140                         set_nlink(inode, 2);
 141                 inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
 142                 inode->i_op = &affs_file_inode_operations;
 143                 inode->i_fop = &affs_file_operations;
 144                 break;
 145         case ST_SOFTLINK:
 146                 inode->i_mode |= S_IFLNK;
 147                 inode->i_op = &affs_symlink_inode_operations;
 148                 inode->i_data.a_ops = &affs_symlink_aops;
 149                 break;
 150         }
 151
 152         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
 153                        = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
 154                          be32_to_cpu(tail->change.mins) * 60 +
 155                          be32_to_cpu(tail->change.ticks) / 50 +
 156                          ((8 * 365 + 2) * 24 * 60 * 60)) +
 157                          sys_tz.tz_minuteswest * 60;
 158         inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
 159         affs_brelse(bh);
 160         unlock_new_inode(inode);
 161         return inode;
 162
 163 bad_inode:
 164         affs_brelse(bh);
 165         iget_failed(inode);
 166         return ERR_PTR(-EIO);
 167 }
 168
 169 int
 170 affs_write_inode(struct inode *inode, struct writeback_control *wbc)
 171 {
 172         struct super_block      *sb = inode->i_sb;
 173         struct buffer_head      *bh;
 174         struct affs_tail        *tail;
 175         uid_t                    uid;
 176         gid_t                    gid;
 177
 178         pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino);
 179
 180         if (!inode->i_nlink)
 181                 // possibly free block
 182                 return 0;
 183         bh = affs_bread(sb, inode->i_ino);
 184         if (!bh) {
 185                 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
 186                 return -EIO;
 187         }
 188         tail = AFFS_TAIL(sb, bh);
 189         if (tail->stype == cpu_to_be32(ST_ROOT)) {
 190                 secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
 191         } else {
 192                 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
 193                 tail->size = cpu_to_be32(inode->i_size);
 194                 secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
 195                 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
 196                         uid = inode->i_uid;
 197                         gid = inode->i_gid;
 198                         if (AFFS_SB(sb)->s_flags & SF_MUFS) {
 199                                 if (inode->i_uid == 0 || inode->i_uid == 0xFFFF)
 200                                         uid = inode->i_uid ^ ~0;
 201                                 if (inode->i_gid == 0 || inode->i_gid == 0xFFFF)
 202                                         gid = inode->i_gid ^ ~0;
 203                         }
 204                         if (!(AFFS_SB(sb)->s_flags & SF_SETUID))
 205                                 tail->uid = cpu_to_be16(uid);
 206                         if (!(AFFS_SB(sb)->s_flags & SF_SETGID))
 207                                 tail->gid = cpu_to_be16(gid);
 208                 }
 209         }
 210         affs_fix_checksum(sb, bh);
 211         mark_buffer_dirty_inode(bh, inode);
 212         affs_brelse(bh);
 213         affs_free_prealloc(inode);
 214         return 0;
 215 }
 216
 217 int
 218 affs_notify_change(struct dentry *dentry, struct iattr *attr)
 219 {
 220         struct inode *inode = dentry->d_inode;
 221         int error;
 222
 223         pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
 224
 225         error = inode_change_ok(inode,attr);
 226         if (error)
 227                 goto out;
 228
 229         if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) ||
 230             ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) ||
 231             ((attr->ia_valid & ATTR_MODE) &&
 232              (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
 233                 if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET))
 234                         error = -EPERM;
 235                 goto out;
 236         }
 237
 238         if ((attr->ia_valid & ATTR_SIZE) &&
 239             attr->ia_size != i_size_read(inode)) {
 240                 error = vmtruncate(inode, attr->ia_size);
 241                 if (error)
 242                         return error;
 243         }
 244
 245         setattr_copy(inode, attr);
 246         mark_inode_dirty(inode);
 247
 248         if (attr->ia_valid & ATTR_MODE)
 249                 mode_to_prot(inode);
 250 out:
 251         return error;
 252 }
 253
 254 void
 255 affs_evict_inode(struct inode *inode)
 256 {
 257         unsigned long cache_page;
 258         pr_debug("AFFS: evict_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
 259         truncate_inode_pages(&inode->i_data, 0);
 260
 261         if (!inode->i_nlink) {
 262                 inode->i_size = 0;
 263                 affs_truncate(inode);
 264         }
 265
 266         invalidate_inode_buffers(inode);
 267         end_writeback(inode);
 268         affs_free_prealloc(inode);
 269         cache_page = (unsigned long)AFFS_I(inode)->i_lc;
 270         if (cache_page) {
 271                 pr_debug("AFFS: freeing ext cache\n");
 272                 AFFS_I(inode)->i_lc = NULL;
 273                 AFFS_I(inode)->i_ac = NULL;
 274                 free_page(cache_page);
 275         }
 276         affs_brelse(AFFS_I(inode)->i_ext_bh);
 277         AFFS_I(inode)->i_ext_last = ~1;
 278         AFFS_I(inode)->i_ext_bh = NULL;
 279
 280         if (!inode->i_nlink)
 281                 affs_free_block(inode->i_sb, inode->i_ino);
 282 }
 283
 284 struct inode *
 285 affs_new_inode(struct inode *dir)
 286 {
 287         struct super_block      *sb = dir->i_sb;
 288         struct inode            *inode;
 289         u32                      block;
 290         struct buffer_head      *bh;
 291
 292         if (!(inode = new_inode(sb)))
 293                 goto err_inode;
 294
 295         if (!(block = affs_alloc_block(dir, dir->i_ino)))
 296                 goto err_block;
 297
 298         bh = affs_getzeroblk(sb, block);
 299         if (!bh)
 300                 goto err_bh;
 301         mark_buffer_dirty_inode(bh, inode);
 302         affs_brelse(bh);
 303
 304         inode->i_uid     = current_fsuid();
 305         inode->i_gid     = current_fsgid();
 306         inode->i_ino     = block;
 307         set_nlink(inode, 1);
 308         inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
 309         atomic_set(&AFFS_I(inode)->i_opencnt, 0);
 310         AFFS_I(inode)->i_blkcnt = 0;
 311         AFFS_I(inode)->i_lc = NULL;
 312         AFFS_I(inode)->i_lc_size = 0;
 313         AFFS_I(inode)->i_lc_shift = 0;
 314         AFFS_I(inode)->i_lc_mask = 0;
 315         AFFS_I(inode)->i_ac = NULL;
 316         AFFS_I(inode)->i_ext_bh = NULL;
 317         AFFS_I(inode)->mmu_private = 0;
 318         AFFS_I(inode)->i_protect = 0;
 319         AFFS_I(inode)->i_lastalloc = 0;
 320         AFFS_I(inode)->i_pa_cnt = 0;
 321         AFFS_I(inode)->i_extcnt = 1;
 322         AFFS_I(inode)->i_ext_last = ~1;
 323
 324         insert_inode_hash(inode);
 325
 326         return inode;
 327
 328 err_bh:
 329         affs_free_block(sb, block);
 330 err_block:
 331         iput(inode);
 332 err_inode:
 333         return NULL;
 334 }
 335
 336 /*
 337  * Add an entry to a directory. Create the header block
 338  * and insert it into the hash table.
 339  */
 340
 341 int
 342 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
 343 {
 344         struct super_block *sb = dir->i_sb;
 345         struct buffer_head *inode_bh = NULL;
 346         struct buffer_head *bh = NULL;
 347         u32 block = 0;
 348         int retval;
 349
 350         pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino,
 351                  (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type);
 352
 353         retval = -EIO;
 354         bh = affs_bread(sb, inode->i_ino);
 355         if (!bh)
 356                 goto done;
 357
 358         affs_lock_link(inode);
 359         switch (type) {
 360         case ST_LINKFILE:
 361         case ST_LINKDIR:
 362                 retval = -ENOSPC;
 363                 block = affs_alloc_block(dir, dir->i_ino);
 364                 if (!block)
 365                         goto err;
 366                 retval = -EIO;
 367                 inode_bh = bh;
 368                 bh = affs_getzeroblk(sb, block);
 369                 if (!bh)
 370                         goto err;
 371                 break;
 372         default:
 373                 break;
 374         }
 375
 376         AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
 377         AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
 378         affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
 379         AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
 380         AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
 381
 382         if (inode_bh) {
 383                 __be32 chain;
 384                 chain = AFFS_TAIL(sb, inode_bh)->link_chain;
 385                 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
 386                 AFFS_TAIL(sb, bh)->link_chain = chain;
 387                 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
 388                 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
 389                 mark_buffer_dirty_inode(inode_bh, inode);
 390                 set_nlink(inode, 2);
 391                 ihold(inode);
 392         }
 393         affs_fix_checksum(sb, bh);
 394         mark_buffer_dirty_inode(bh, inode);
 395         dentry->d_fsdata = (void *)(long)bh->b_blocknr;
 396
 397         affs_lock_dir(dir);
 398         retval = affs_insert_hash(dir, bh);
 399         mark_buffer_dirty_inode(bh, inode);
 400         affs_unlock_dir(dir);
 401         affs_unlock_link(inode);
 402
 403         d_instantiate(dentry, inode);
 404 done:
 405         affs_brelse(inode_bh);
 406         affs_brelse(bh);
 407         return retval;
 408 err:
 409         if (block)
 410                 affs_free_block(sb, block);
 411         affs_unlock_link(inode);
 412         goto done;
 413 }