fs/ocfs2/file.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * file.c
   5  *
   6  * File open, close, extend, truncate
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #include <linux/capability.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/highmem.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/uio.h>
  33 #include <linux/sched.h>
  34 #include <linux/splice.h>
  35 #include <linux/mount.h>
  36 #include <linux/writeback.h>
  37 #include <linux/falloc.h>
  38 #include <linux/quotaops.h>
  39 #include <linux/blkdev.h>
  40
  41 #define MLOG_MASK_PREFIX ML_INODE
  42 #include <cluster/masklog.h>
  43
  44 #include "ocfs2.h"
  45
  46 #include "alloc.h"
  47 #include "aops.h"
  48 #include "dir.h"
  49 #include "dlmglue.h"
  50 #include "extent_map.h"
  51 #include "file.h"
  52 #include "sysfile.h"
  53 #include "inode.h"
  54 #include "ioctl.h"
  55 #include "journal.h"
  56 #include "locks.h"
  57 #include "mmap.h"
  58 #include "suballoc.h"
  59 #include "super.h"
  60 #include "xattr.h"
  61 #include "acl.h"
  62 #include "quota.h"
  63 #include "refcounttree.h"
  64
  65 #include "buffer_head_io.h"
  66
  67 static int ocfs2_sync_inode(struct inode *inode)
  68 {
  69         filemap_fdatawrite(inode->i_mapping);
  70         return sync_mapping_buffers(inode->i_mapping);
  71 }
  72
  73 static int ocfs2_init_file_private(struct inode *inode, struct file *file)
  74 {
  75         struct ocfs2_file_private *fp;
  76
  77         fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
  78         if (!fp)
  79                 return -ENOMEM;
  80
  81         fp->fp_file = file;
  82         mutex_init(&fp->fp_mutex);
  83         ocfs2_file_lock_res_init(&fp->fp_flock, fp);
  84         file->private_data = fp;
  85
  86         return 0;
  87 }
  88
  89 static void ocfs2_free_file_private(struct inode *inode, struct file *file)
  90 {
  91         struct ocfs2_file_private *fp = file->private_data;
  92         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  93
  94         if (fp) {
  95                 ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
  96                 ocfs2_lock_res_free(&fp->fp_flock);
  97                 kfree(fp);
  98                 file->private_data = NULL;
  99         }
 100 }
 101
 102 static int ocfs2_file_open(struct inode *inode, struct file *file)
 103 {
 104         int status;
 105         int mode = file->f_flags;
 106         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 107
 108         mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
 109                    file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name);
 110
 111         if (file->f_mode & FMODE_WRITE)
 112                 dquot_initialize(inode);
 113
 114         spin_lock(&oi->ip_lock);
 115
 116         /* Check that the inode hasn't been wiped from disk by another
 117          * node. If it hasn't then we're safe as long as we hold the
 118          * spin lock until our increment of open count. */
 119         if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
 120                 spin_unlock(&oi->ip_lock);
 121
 122                 status = -ENOENT;
 123                 goto leave;
 124         }
 125
 126         if (mode & O_DIRECT)
 127                 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
 128
 129         oi->ip_open_count++;
 130         spin_unlock(&oi->ip_lock);
 131
 132         status = ocfs2_init_file_private(inode, file);
 133         if (status) {
 134                 /*
 135                  * We want to set open count back if we're failing the
 136                  * open.
 137                  */
 138                 spin_lock(&oi->ip_lock);
 139                 oi->ip_open_count--;
 140                 spin_unlock(&oi->ip_lock);
 141         }
 142
 143 leave:
 144         mlog_exit(status);
 145         return status;
 146 }
 147
 148 static int ocfs2_file_release(struct inode *inode, struct file *file)
 149 {
 150         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 151
 152         mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
 153                        file->f_path.dentry->d_name.len,
 154                        file->f_path.dentry->d_name.name);
 155
 156         spin_lock(&oi->ip_lock);
 157         if (!--oi->ip_open_count)
 158                 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
 159         spin_unlock(&oi->ip_lock);
 160
 161         ocfs2_free_file_private(inode, file);
 162
 163         mlog_exit(0);
 164
 165         return 0;
 166 }
 167
 168 static int ocfs2_dir_open(struct inode *inode, struct file *file)
 169 {
 170         return ocfs2_init_file_private(inode, file);
 171 }
 172
 173 static int ocfs2_dir_release(struct inode *inode, struct file *file)
 174 {
 175         ocfs2_free_file_private(inode, file);
 176         return 0;
 177 }
 178
 179 static int ocfs2_sync_file(struct file *file, int datasync)
 180 {
 181         int err = 0;
 182         journal_t *journal;
 183         struct dentry *dentry = file->f_path.dentry;
 184         struct inode *inode = file->f_mapping->host;
 185         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 186
 187         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync,
 188                    dentry->d_name.len, dentry->d_name.name);
 189
 190         err = ocfs2_sync_inode(dentry->d_inode);
 191         if (err)
 192                 goto bail;
 193
 194         if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) {
 195                 /*
 196                  * We still have to flush drive's caches to get data to the
 197                  * platter
 198                  */
 199                 if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
 200                         blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL,
 201                                            NULL, BLKDEV_IFL_WAIT);
 202                 goto bail;
 203         }
 204
 205         journal = osb->journal->j_journal;
 206         err = jbd2_journal_force_commit(journal);
 207
 208 bail:
 209         mlog_exit(err);
 210
 211         return (err < 0) ? -EIO : 0;
 212 }
 213
 214 int ocfs2_should_update_atime(struct inode *inode,
 215                               struct vfsmount *vfsmnt)
 216 {
 217         struct timespec now;
 218         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 219
 220         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 221                 return 0;
 222
 223         if ((inode->i_flags & S_NOATIME) ||
 224             ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
 225                 return 0;
 226
 227         /*
 228          * We can be called with no vfsmnt structure - NFSD will
 229          * sometimes do this.
 230          *
 231          * Note that our action here is different than touch_atime() -
 232          * if we can't tell whether this is a noatime mount, then we
 233          * don't know whether to trust the value of s_atime_quantum.
 234          */
 235         if (vfsmnt == NULL)
 236                 return 0;
 237
 238         if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
 239             ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 240                 return 0;
 241
 242         if (vfsmnt->mnt_flags & MNT_RELATIME) {
 243                 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
 244                     (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
 245                         return 1;
 246
 247                 return 0;
 248         }
 249
 250         now = CURRENT_TIME;
 251         if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
 252                 return 0;
 253         else
 254                 return 1;
 255 }
 256
 257 int ocfs2_update_inode_atime(struct inode *inode,
 258                              struct buffer_head *bh)
 259 {
 260         int ret;
 261         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 262         handle_t *handle;
 263         struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
 264
 265         mlog_entry_void();
 266
 267         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 268         if (IS_ERR(handle)) {
 269                 ret = PTR_ERR(handle);
 270                 mlog_errno(ret);
 271                 goto out;
 272         }
 273
 274         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 275                                       OCFS2_JOURNAL_ACCESS_WRITE);
 276         if (ret) {
 277                 mlog_errno(ret);
 278                 goto out_commit;
 279         }
 280
 281         /*
 282          * Don't use ocfs2_mark_inode_dirty() here as we don't always
 283          * have i_mutex to guard against concurrent changes to other
 284          * inode fields.
 285          */
 286         inode->i_atime = CURRENT_TIME;
 287         di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 288         di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 289         ocfs2_journal_dirty(handle, bh);
 290
 291 out_commit:
 292         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 293 out:
 294         mlog_exit(ret);
 295         return ret;
 296 }
 297
 298 static int ocfs2_set_inode_size(handle_t *handle,
 299                                 struct inode *inode,
 300                                 struct buffer_head *fe_bh,
 301                                 u64 new_i_size)
 302 {
 303         int status;
 304
 305         mlog_entry_void();
 306         i_size_write(inode, new_i_size);
 307         inode->i_blocks = ocfs2_inode_sector_count(inode);
 308         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 309
 310         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 311         if (status < 0) {
 312                 mlog_errno(status);
 313                 goto bail;
 314         }
 315
 316 bail:
 317         mlog_exit(status);
 318         return status;
 319 }
 320
 321 int ocfs2_simple_size_update(struct inode *inode,
 322                              struct buffer_head *di_bh,
 323                              u64 new_i_size)
 324 {
 325         int ret;
 326         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 327         handle_t *handle = NULL;
 328
 329         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 330         if (IS_ERR(handle)) {
 331                 ret = PTR_ERR(handle);
 332                 mlog_errno(ret);
 333                 goto out;
 334         }
 335
 336         ret = ocfs2_set_inode_size(handle, inode, di_bh,
 337                                    new_i_size);
 338         if (ret < 0)
 339                 mlog_errno(ret);
 340
 341         ocfs2_commit_trans(osb, handle);
 342 out:
 343         return ret;
 344 }
 345
 346 static int ocfs2_cow_file_pos(struct inode *inode,
 347                               struct buffer_head *fe_bh,
 348                               u64 offset)
 349 {
 350         int status;
 351         u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 352         unsigned int num_clusters = 0;
 353         unsigned int ext_flags = 0;
 354
 355         /*
 356          * If the new offset is aligned to the range of the cluster, there is
 357          * no space for ocfs2_zero_range_for_truncate to fill, so no need to
 358          * CoW either.
 359          */
 360         if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
 361                 return 0;
 362
 363         status = ocfs2_get_clusters(inode, cpos, &phys,
 364                                     &num_clusters, &ext_flags);
 365         if (status) {
 366                 mlog_errno(status);
 367                 goto out;
 368         }
 369
 370         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
 371                 goto out;
 372
 373         return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1);
 374
 375 out:
 376         return status;
 377 }
 378
 379 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
 380                                      struct inode *inode,
 381                                      struct buffer_head *fe_bh,
 382                                      u64 new_i_size)
 383 {
 384         int status;
 385         handle_t *handle;
 386         struct ocfs2_dinode *di;
 387         u64 cluster_bytes;
 388
 389         mlog_entry_void();
 390
 391         /*
 392          * We need to CoW the cluster contains the offset if it is reflinked
 393          * since we will call ocfs2_zero_range_for_truncate later which will
 394          * write "0" from offset to the end of the cluster.
 395          */
 396         status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
 397         if (status) {
 398                 mlog_errno(status);
 399                 return status;
 400         }
 401
 402         /* TODO: This needs to actually orphan the inode in this
 403          * transaction. */
 404
 405         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 406         if (IS_ERR(handle)) {
 407                 status = PTR_ERR(handle);
 408                 mlog_errno(status);
 409                 goto out;
 410         }
 411
 412         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 413                                          OCFS2_JOURNAL_ACCESS_WRITE);
 414         if (status < 0) {
 415                 mlog_errno(status);
 416                 goto out_commit;
 417         }
 418
 419         /*
 420          * Do this before setting i_size.
 421          */
 422         cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
 423         status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
 424                                                cluster_bytes);
 425         if (status) {
 426                 mlog_errno(status);
 427                 goto out_commit;
 428         }
 429
 430         i_size_write(inode, new_i_size);
 431         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 432
 433         di = (struct ocfs2_dinode *) fe_bh->b_data;
 434         di->i_size = cpu_to_le64(new_i_size);
 435         di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
 436         di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 437
 438         ocfs2_journal_dirty(handle, fe_bh);
 439
 440 out_commit:
 441         ocfs2_commit_trans(osb, handle);
 442 out:
 443
 444         mlog_exit(status);
 445         return status;
 446 }
 447
 448 static int ocfs2_truncate_file(struct inode *inode,
 449                                struct buffer_head *di_bh,
 450                                u64 new_i_size)
 451 {
 452         int status = 0;
 453         struct ocfs2_dinode *fe = NULL;
 454         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 455
 456         mlog_entry("(inode = %llu, new_i_size = %llu\n",
 457                    (unsigned long long)OCFS2_I(inode)->ip_blkno,
 458                    (unsigned long long)new_i_size);
 459
 460         /* We trust di_bh because it comes from ocfs2_inode_lock(), which
 461          * already validated it */
 462         fe = (struct ocfs2_dinode *) di_bh->b_data;
 463
 464         mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
 465                         "Inode %llu, inode i_size = %lld != di "
 466                         "i_size = %llu, i_flags = 0x%x\n",
 467                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 468                         i_size_read(inode),
 469                         (unsigned long long)le64_to_cpu(fe->i_size),
 470                         le32_to_cpu(fe->i_flags));
 471
 472         if (new_i_size > le64_to_cpu(fe->i_size)) {
 473                 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
 474                      (unsigned long long)le64_to_cpu(fe->i_size),
 475                      (unsigned long long)new_i_size);
 476                 status = -EINVAL;
 477                 mlog_errno(status);
 478                 goto bail;
 479         }
 480
 481         mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
 482              (unsigned long long)le64_to_cpu(fe->i_blkno),
 483              (unsigned long long)le64_to_cpu(fe->i_size),
 484              (unsigned long long)new_i_size);
 485
 486         /* lets handle the simple truncate cases before doing any more
 487          * cluster locking. */
 488         if (new_i_size == le64_to_cpu(fe->i_size))
 489                 goto bail;
 490
 491         down_write(&OCFS2_I(inode)->ip_alloc_sem);
 492
 493         ocfs2_resv_discard(&osb->osb_la_resmap,
 494                            &OCFS2_I(inode)->ip_la_data_resv);
 495
 496         /*
 497          * The inode lock forced other nodes to sync and drop their
 498          * pages, which (correctly) happens even if we have a truncate
 499          * without allocation change - ocfs2 cluster sizes can be much
 500          * greater than page size, so we have to truncate them
 501          * anyway.
 502          */
 503         unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
 504         truncate_inode_pages(inode->i_mapping, new_i_size);
 505
 506         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
 507                 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
 508                                                i_size_read(inode), 1);
 509                 if (status)
 510                         mlog_errno(status);
 511
 512                 goto bail_unlock_sem;
 513         }
 514
 515         /* alright, we're going to need to do a full blown alloc size
 516          * change. Orphan the inode so that recovery can complete the
 517          * truncate if necessary. This does the task of marking
 518          * i_size. */
 519         status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
 520         if (status < 0) {
 521                 mlog_errno(status);
 522                 goto bail_unlock_sem;
 523         }
 524
 525         status = ocfs2_commit_truncate(osb, inode, di_bh);
 526         if (status < 0) {
 527                 mlog_errno(status);
 528                 goto bail_unlock_sem;
 529         }
 530
 531         /* TODO: orphan dir cleanup here. */
 532 bail_unlock_sem:
 533         up_write(&OCFS2_I(inode)->ip_alloc_sem);
 534
 535 bail:
 536         if (!status && OCFS2_I(inode)->ip_clusters == 0)
 537                 status = ocfs2_try_remove_refcount_tree(inode, di_bh);
 538
 539         mlog_exit(status);
 540         return status;
 541 }
 542
 543 /*
 544  * extend file allocation only here.
 545  * we'll update all the disk stuff, and oip->alloc_size
 546  *
 547  * expect stuff to be locked, a transaction started and enough data /
 548  * metadata reservations in the contexts.
 549  *
 550  * Will return -EAGAIN, and a reason if a restart is needed.
 551  * If passed in, *reason will always be set, even in error.
 552  */
 553 int ocfs2_add_inode_data(struct ocfs2_super *osb,
 554                          struct inode *inode,
 555                          u32 *logical_offset,
 556                          u32 clusters_to_add,
 557                          int mark_unwritten,
 558                          struct buffer_head *fe_bh,
 559                          handle_t *handle,
 560                          struct ocfs2_alloc_context *data_ac,
 561                          struct ocfs2_alloc_context *meta_ac,
 562                          enum ocfs2_alloc_restarted *reason_ret)
 563 {
 564         int ret;
 565         struct ocfs2_extent_tree et;
 566
 567         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
 568         ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
 569                                           clusters_to_add, mark_unwritten,
 570                                           data_ac, meta_ac, reason_ret);
 571
 572         return ret;
 573 }
 574
 575 static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
 576                                      u32 clusters_to_add, int mark_unwritten)
 577 {
 578         int status = 0;
 579         int restart_func = 0;
 580         int credits;
 581         u32 prev_clusters;
 582         struct buffer_head *bh = NULL;
 583         struct ocfs2_dinode *fe = NULL;
 584         handle_t *handle = NULL;
 585         struct ocfs2_alloc_context *data_ac = NULL;
 586         struct ocfs2_alloc_context *meta_ac = NULL;
 587         enum ocfs2_alloc_restarted why;
 588         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 589         struct ocfs2_extent_tree et;
 590         int did_quota = 0;
 591
 592         mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
 593
 594         /*
 595          * This function only exists for file systems which don't
 596          * support holes.
 597          */
 598         BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
 599
 600         status = ocfs2_read_inode_block(inode, &bh);
 601         if (status < 0) {
 602                 mlog_errno(status);
 603                 goto leave;
 604         }
 605         fe = (struct ocfs2_dinode *) bh->b_data;
 606
 607 restart_all:
 608         BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
 609
 610         mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
 611              "clusters_to_add = %u\n",
 612              (unsigned long long)OCFS2_I(inode)->ip_blkno,
 613              (long long)i_size_read(inode), le32_to_cpu(fe->i_clusters),
 614              clusters_to_add);
 615         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
 616         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 617                                        &data_ac, &meta_ac);
 618         if (status) {
 619                 mlog_errno(status);
 620                 goto leave;
 621         }
 622
 623         credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list,
 624                                             clusters_to_add);
 625         handle = ocfs2_start_trans(osb, credits);
 626         if (IS_ERR(handle)) {
 627                 status = PTR_ERR(handle);
 628                 handle = NULL;
 629                 mlog_errno(status);
 630                 goto leave;
 631         }
 632
 633 restarted_transaction:
 634         status = dquot_alloc_space_nodirty(inode,
 635                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 636         if (status)
 637                 goto leave;
 638         did_quota = 1;
 639
 640         /* reserve a write to the file entry early on - that we if we
 641          * run out of credits in the allocation path, we can still
 642          * update i_size. */
 643         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 644                                          OCFS2_JOURNAL_ACCESS_WRITE);
 645         if (status < 0) {
 646                 mlog_errno(status);
 647                 goto leave;
 648         }
 649
 650         prev_clusters = OCFS2_I(inode)->ip_clusters;
 651
 652         status = ocfs2_add_inode_data(osb,
 653                                       inode,
 654                                       &logical_start,
 655                                       clusters_to_add,
 656                                       mark_unwritten,
 657                                       bh,
 658                                       handle,
 659                                       data_ac,
 660                                       meta_ac,
 661                                       &why);
 662         if ((status < 0) && (status != -EAGAIN)) {
 663                 if (status != -ENOSPC)
 664                         mlog_errno(status);
 665                 goto leave;
 666         }
 667
 668         ocfs2_journal_dirty(handle, bh);
 669
 670         spin_lock(&OCFS2_I(inode)->ip_lock);
 671         clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
 672         spin_unlock(&OCFS2_I(inode)->ip_lock);
 673         /* Release unused quota reservation */
 674         dquot_free_space(inode,
 675                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 676         did_quota = 0;
 677
 678         if (why != RESTART_NONE && clusters_to_add) {
 679                 if (why == RESTART_META) {
 680                         mlog(0, "restarting function.\n");
 681                         restart_func = 1;
 682                         status = 0;
 683                 } else {
 684                         BUG_ON(why != RESTART_TRANS);
 685
 686                         mlog(0, "restarting transaction.\n");
 687                         /* TODO: This can be more intelligent. */
 688                         credits = ocfs2_calc_extend_credits(osb->sb,
 689                                                             &fe->id2.i_list,
 690                                                             clusters_to_add);
 691                         status = ocfs2_extend_trans(handle, credits);
 692                         if (status < 0) {
 693                                 /* handle still has to be committed at
 694                                  * this point. */
 695                                 status = -ENOMEM;
 696                                 mlog_errno(status);
 697                                 goto leave;
 698                         }
 699                         goto restarted_transaction;
 700                 }
 701         }
 702
 703         mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
 704              le32_to_cpu(fe->i_clusters),
 705              (unsigned long long)le64_to_cpu(fe->i_size));
 706         mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
 707              OCFS2_I(inode)->ip_clusters, (long long)i_size_read(inode));
 708
 709 leave:
 710         if (status < 0 && did_quota)
 711                 dquot_free_space(inode,
 712                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 713         if (handle) {
 714                 ocfs2_commit_trans(osb, handle);
 715                 handle = NULL;
 716         }
 717         if (data_ac) {
 718                 ocfs2_free_alloc_context(data_ac);
 719                 data_ac = NULL;
 720         }
 721         if (meta_ac) {
 722                 ocfs2_free_alloc_context(meta_ac);
 723                 meta_ac = NULL;
 724         }
 725         if ((!status) && restart_func) {
 726                 restart_func = 0;
 727                 goto restart_all;
 728         }
 729         brelse(bh);
 730         bh = NULL;
 731
 732         mlog_exit(status);
 733         return status;
 734 }
 735
 736 /*
 737  * While a write will already be ordering the data, a truncate will not.
 738  * Thus, we need to explicitly order the zeroed pages.
 739  */
 740 static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode)
 741 {
 742         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 743         handle_t *handle = NULL;
 744         int ret = 0;
 745
 746         if (!ocfs2_should_order_data(inode))
 747                 goto out;
 748
 749         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 750         if (IS_ERR(handle)) {
 751                 ret = -ENOMEM;
 752                 mlog_errno(ret);
 753                 goto out;
 754         }
 755
 756         ret = ocfs2_jbd2_file_inode(handle, inode);
 757         if (ret < 0)
 758                 mlog_errno(ret);
 759
 760 out:
 761         if (ret) {
 762                 if (!IS_ERR(handle))
 763                         ocfs2_commit_trans(osb, handle);
 764                 handle = ERR_PTR(ret);
 765         }
 766         return handle;
 767 }
 768
 769 /* Some parts of this taken from generic_cont_expand, which turned out
 770  * to be too fragile to do exactly what we need without us having to
 771  * worry about recursive locking in ->write_begin() and ->write_end(). */
 772 static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
 773                                  u64 abs_to)
 774 {
 775         struct address_space *mapping = inode->i_mapping;
 776         struct page *page;
 777         unsigned long index = abs_from >> PAGE_CACHE_SHIFT;
 778         handle_t *handle = NULL;
 779         int ret = 0;
 780         unsigned zero_from, zero_to, block_start, block_end;
 781
 782         BUG_ON(abs_from >= abs_to);
 783         BUG_ON(abs_to > (((u64)index + 1) << PAGE_CACHE_SHIFT));
 784         BUG_ON(abs_from & (inode->i_blkbits - 1));
 785
 786         page = find_or_create_page(mapping, index, GFP_NOFS);
 787         if (!page) {
 788                 ret = -ENOMEM;
 789                 mlog_errno(ret);
 790                 goto out;
 791         }
 792
 793         /* Get the offsets within the page that we want to zero */
 794         zero_from = abs_from & (PAGE_CACHE_SIZE - 1);
 795         zero_to = abs_to & (PAGE_CACHE_SIZE - 1);
 796         if (!zero_to)
 797                 zero_to = PAGE_CACHE_SIZE;
 798
 799         mlog(0,
 800              "abs_from = %llu, abs_to = %llu, index = %lu, zero_from = %u, zero_to = %u\n",
 801              (unsigned long long)abs_from, (unsigned long long)abs_to,
 802              index, zero_from, zero_to);
 803
 804         /* We know that zero_from is block aligned */
 805         for (block_start = zero_from; block_start < zero_to;
 806              block_start = block_end) {
 807                 block_end = block_start + (1 << inode->i_blkbits);
 808
 809                 /*
 810                  * block_start is block-aligned.  Bump it by one to
 811                  * force ocfs2_{prepare,commit}_write() to zero the
 812                  * whole block.
 813                  */
 814                 ret = ocfs2_prepare_write_nolock(inode, page,
 815                                                  block_start + 1,
 816                                                  block_start + 1);
 817                 if (ret < 0) {
 818                         mlog_errno(ret);
 819                         goto out_unlock;
 820                 }
 821
 822                 if (!handle) {
 823                         handle = ocfs2_zero_start_ordered_transaction(inode);
 824                         if (IS_ERR(handle)) {
 825                                 ret = PTR_ERR(handle);
 826                                 handle = NULL;
 827                                 break;
 828                         }
 829                 }
 830
 831                 /* must not update i_size! */
 832                 ret = block_commit_write(page, block_start + 1,
 833                                          block_start + 1);
 834                 if (ret < 0)
 835                         mlog_errno(ret);
 836                 else
 837                         ret = 0;
 838         }
 839
 840         if (handle)
 841                 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 842
 843 out_unlock:
 844         unlock_page(page);
 845         page_cache_release(page);
 846 out:
 847         return ret;
 848 }
 849
 850 /*
 851  * Find the next range to zero.  We do this in terms of bytes because
 852  * that's what ocfs2_zero_extend() wants, and it is dealing with the
 853  * pagecache.  We may return multiple extents.
 854  *
 855  * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
 856  * needs to be zeroed.  range_start and range_end return the next zeroing
 857  * range.  A subsequent call should pass the previous range_end as its
 858  * zero_start.  If range_end is 0, there's nothing to do.
 859  *
 860  * Unwritten extents are skipped over.  Refcounted extents are CoWd.
 861  */
 862 static int ocfs2_zero_extend_get_range(struct inode *inode,
 863                                        struct buffer_head *di_bh,
 864                                        u64 zero_start, u64 zero_end,
 865                                        u64 *range_start, u64 *range_end)
 866 {
 867         int rc = 0, needs_cow = 0;
 868         u32 p_cpos, zero_clusters = 0;
 869         u32 zero_cpos =
 870                 zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 871         u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
 872         unsigned int num_clusters = 0;
 873         unsigned int ext_flags = 0;
 874
 875         while (zero_cpos < last_cpos) {
 876                 rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
 877                                         &num_clusters, &ext_flags);
 878                 if (rc) {
 879                         mlog_errno(rc);
 880                         goto out;
 881                 }
 882
 883                 if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
 884                         zero_clusters = num_clusters;
 885                         if (ext_flags & OCFS2_EXT_REFCOUNTED)
 886                                 needs_cow = 1;
 887                         break;
 888                 }
 889
 890                 zero_cpos += num_clusters;
 891         }
 892         if (!zero_clusters) {
 893                 *range_end = 0;
 894                 goto out;
 895         }
 896
 897         while ((zero_cpos + zero_clusters) < last_cpos) {
 898                 rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
 899                                         &p_cpos, &num_clusters,
 900                                         &ext_flags);
 901                 if (rc) {
 902                         mlog_errno(rc);
 903                         goto out;
 904                 }
 905
 906                 if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
 907                         break;
 908                 if (ext_flags & OCFS2_EXT_REFCOUNTED)
 909                         needs_cow = 1;
 910                 zero_clusters += num_clusters;
 911         }
 912         if ((zero_cpos + zero_clusters) > last_cpos)
 913                 zero_clusters = last_cpos - zero_cpos;
 914
 915         if (needs_cow) {
 916                 rc = ocfs2_refcount_cow(inode, di_bh, zero_cpos, zero_clusters,
 917                                         UINT_MAX);
 918                 if (rc) {
 919                         mlog_errno(rc);
 920                         goto out;
 921                 }
 922         }
 923
 924         *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
 925         *range_end = ocfs2_clusters_to_bytes(inode->i_sb,
 926                                              zero_cpos + zero_clusters);
 927
 928 out:
 929         return rc;
 930 }
 931
 932 /*
 933  * Zero one range returned from ocfs2_zero_extend_get_range().  The caller
 934  * has made sure that the entire range needs zeroing.
 935  */
 936 static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
 937                                    u64 range_end)
 938 {
 939         int rc = 0;
 940         u64 next_pos;
 941         u64 zero_pos = range_start;
 942
 943         mlog(0, "range_start = %llu, range_end = %llu\n",
 944              (unsigned long long)range_start,
 945              (unsigned long long)range_end);
 946         BUG_ON(range_start >= range_end);
 947
 948         while (zero_pos < range_end) {
 949                 next_pos = (zero_pos & PAGE_CACHE_MASK) + PAGE_CACHE_SIZE;
 950                 if (next_pos > range_end)
 951                         next_pos = range_end;
 952                 rc = ocfs2_write_zero_page(inode, zero_pos, next_pos);
 953                 if (rc < 0) {
 954                         mlog_errno(rc);
 955                         break;
 956                 }
 957                 zero_pos = next_pos;
 958
 959                 /*
 960                  * Very large extends have the potential to lock up
 961                  * the cpu for extended periods of time.
 962                  */
 963                 cond_resched();
 964         }
 965
 966         return rc;
 967 }
 968
 969 int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
 970                       loff_t zero_to_size)
 971 {
 972         int ret = 0;
 973         u64 zero_start, range_start = 0, range_end = 0;
 974         struct super_block *sb = inode->i_sb;
 975
 976         zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
 977         mlog(0, "zero_start %llu for i_size %llu\n",
 978              (unsigned long long)zero_start,
 979              (unsigned long long)i_size_read(inode));
 980         while (zero_start < zero_to_size) {
 981                 ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
 982                                                   zero_to_size,
 983                                                   &range_start,
 984                                                   &range_end);
 985                 if (ret) {
 986                         mlog_errno(ret);
 987                         break;
 988                 }
 989                 if (!range_end)
 990                         break;
 991                 /* Trim the ends */
 992                 if (range_start < zero_start)
 993                         range_start = zero_start;
 994                 if (range_end > zero_to_size)
 995                         range_end = zero_to_size;
 996
 997                 ret = ocfs2_zero_extend_range(inode, range_start,
 998                                               range_end);
 999                 if (ret) {
1000                         mlog_errno(ret);
1001                         break;
1002                 }
1003                 zero_start = range_end;
1004         }
1005
1006         return ret;
1007 }
1008
1009 int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
1010                           u64 new_i_size, u64 zero_to)
1011 {
1012         int ret;
1013         u32 clusters_to_add;
1014         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1015
1016         /*
1017          * Only quota files call this without a bh, and they can't be
1018          * refcounted.
1019          */
1020         BUG_ON(!di_bh && (oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
1021         BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
1022
1023         clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
1024         if (clusters_to_add < oi->ip_clusters)
1025                 clusters_to_add = 0;
1026         else
1027                 clusters_to_add -= oi->ip_clusters;
1028
1029         if (clusters_to_add) {
1030                 ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
1031                                                 clusters_to_add, 0);
1032                 if (ret) {
1033                         mlog_errno(ret);
1034                         goto out;
1035                 }
1036         }
1037
1038         /*
1039          * Call this even if we don't add any clusters to the tree. We
1040          * still need to zero the area between the old i_size and the
1041          * new i_size.
1042          */
1043         ret = ocfs2_zero_extend(inode, di_bh, zero_to);
1044         if (ret < 0)
1045                 mlog_errno(ret);
1046
1047 out:
1048         return ret;
1049 }
1050
1051 static int ocfs2_extend_file(struct inode *inode,
1052                              struct buffer_head *di_bh,
1053                              u64 new_i_size)
1054 {
1055         int ret = 0;
1056         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1057
1058         BUG_ON(!di_bh);
1059
1060         /* setattr sometimes calls us like this. */
1061         if (new_i_size == 0)
1062                 goto out;
1063
1064         if (i_size_read(inode) == new_i_size)
1065                 goto out;
1066         BUG_ON(new_i_size < i_size_read(inode));
1067
1068         /*
1069          * The alloc sem blocks people in read/write from reading our
1070          * allocation until we're done changing it. We depend on
1071          * i_mutex to block other extend/truncate calls while we're
1072          * here.  We even have to hold it for sparse files because there
1073          * might be some tail zeroing.
1074          */
1075         down_write(&oi->ip_alloc_sem);
1076
1077         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1078                 /*
1079                  * We can optimize small extends by keeping the inodes
1080                  * inline data.
1081                  */
1082                 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1083                         up_write(&oi->ip_alloc_sem);
1084                         goto out_update_size;
1085                 }
1086
1087                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1088                 if (ret) {
1089                         up_write(&oi->ip_alloc_sem);
1090                         mlog_errno(ret);
1091                         goto out;
1092                 }
1093         }
1094
1095         if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1096                 ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1097         else
1098                 ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1099                                             new_i_size);
1100
1101         up_write(&oi->ip_alloc_sem);
1102
1103         if (ret < 0) {
1104                 mlog_errno(ret);
1105                 goto out;
1106         }
1107
1108 out_update_size:
1109         ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1110         if (ret < 0)
1111                 mlog_errno(ret);
1112
1113 out:
1114         return ret;
1115 }
1116
1117 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1118 {
1119         int status = 0, size_change;
1120         struct inode *inode = dentry->d_inode;
1121         struct super_block *sb = inode->i_sb;
1122         struct ocfs2_super *osb = OCFS2_SB(sb);
1123         struct buffer_head *bh = NULL;
1124         handle_t *handle = NULL;
1125         struct dquot *transfer_to[MAXQUOTAS] = { };
1126         int qtype;
1127
1128         mlog_entry("(0x%p, '%.*s')\n", dentry,
1129                    dentry->d_name.len, dentry->d_name.name);
1130
1131         /* ensuring we don't even attempt to truncate a symlink */
1132         if (S_ISLNK(inode->i_mode))
1133                 attr->ia_valid &= ~ATTR_SIZE;
1134
1135         if (attr->ia_valid & ATTR_MODE)
1136                 mlog(0, "mode change: %d\n", attr->ia_mode);
1137         if (attr->ia_valid & ATTR_UID)
1138                 mlog(0, "uid change: %d\n", attr->ia_uid);
1139         if (attr->ia_valid & ATTR_GID)
1140                 mlog(0, "gid change: %d\n", attr->ia_gid);
1141         if (attr->ia_valid & ATTR_SIZE)
1142                 mlog(0, "size change...\n");
1143         if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
1144                 mlog(0, "time change...\n");
1145
1146 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1147                            | ATTR_GID | ATTR_UID | ATTR_MODE)
1148         if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
1149                 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
1150                 return 0;
1151         }
1152
1153         status = inode_change_ok(inode, attr);
1154         if (status)
1155                 return status;
1156
1157         if (is_quota_modification(inode, attr))
1158                 dquot_initialize(inode);
1159         size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1160         if (size_change) {
1161                 status = ocfs2_rw_lock(inode, 1);
1162                 if (status < 0) {
1163                         mlog_errno(status);
1164                         goto bail;
1165                 }
1166         }
1167
1168         status = ocfs2_inode_lock(inode, &bh, 1);
1169         if (status < 0) {
1170                 if (status != -ENOENT)
1171                         mlog_errno(status);
1172                 goto bail_unlock_rw;
1173         }
1174
1175         if (size_change && attr->ia_size != i_size_read(inode)) {
1176                 status = inode_newsize_ok(inode, attr->ia_size);
1177                 if (status)
1178                         goto bail_unlock;
1179
1180                 if (i_size_read(inode) > attr->ia_size) {
1181                         if (ocfs2_should_order_data(inode)) {
1182                                 status = ocfs2_begin_ordered_truncate(inode,
1183                                                                       attr->ia_size);
1184                                 if (status)
1185                                         goto bail_unlock;
1186                         }
1187                         status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1188                 } else
1189                         status = ocfs2_extend_file(inode, bh, attr->ia_size);
1190                 if (status < 0) {
1191                         if (status != -ENOSPC)
1192                                 mlog_errno(status);
1193                         status = -ENOSPC;
1194                         goto bail_unlock;
1195                 }
1196         }
1197
1198         if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
1199             (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
1200                 /*
1201                  * Gather pointers to quota structures so that allocation /
1202                  * freeing of quota structures happens here and not inside
1203                  * dquot_transfer() where we have problems with lock ordering
1204                  */
1205                 if (attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid
1206                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1207                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1208                         transfer_to[USRQUOTA] = dqget(sb, attr->ia_uid,
1209                                                       USRQUOTA);
1210                         if (!transfer_to[USRQUOTA]) {
1211                                 status = -ESRCH;
1212                                 goto bail_unlock;
1213                         }
1214                 }
1215                 if (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid
1216                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1217                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1218                         transfer_to[GRPQUOTA] = dqget(sb, attr->ia_gid,
1219                                                       GRPQUOTA);
1220                         if (!transfer_to[GRPQUOTA]) {
1221                                 status = -ESRCH;
1222                                 goto bail_unlock;
1223                         }
1224                 }
1225                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1226                                            2 * ocfs2_quota_trans_credits(sb));
1227                 if (IS_ERR(handle)) {
1228                         status = PTR_ERR(handle);
1229                         mlog_errno(status);
1230                         goto bail_unlock;
1231                 }
1232                 status = __dquot_transfer(inode, transfer_to);
1233                 if (status < 0)
1234                         goto bail_commit;
1235         } else {
1236                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1237                 if (IS_ERR(handle)) {
1238                         status = PTR_ERR(handle);
1239                         mlog_errno(status);
1240                         goto bail_unlock;
1241                 }
1242         }
1243
1244         /*
1245          * This will intentionally not wind up calling truncate_setsize(),
1246          * since all the work for a size change has been done above.
1247          * Otherwise, we could get into problems with truncate as
1248          * ip_alloc_sem is used there to protect against i_size
1249          * changes.
1250          *
1251          * XXX: this means the conditional below can probably be removed.
1252          */
1253         if ((attr->ia_valid & ATTR_SIZE) &&
1254             attr->ia_size != i_size_read(inode)) {
1255                 status = vmtruncate(inode, attr->ia_size);
1256                 if (status) {
1257                         mlog_errno(status);
1258                         goto bail_commit;
1259                 }
1260         }
1261
1262         setattr_copy(inode, attr);
1263         mark_inode_dirty(inode);
1264
1265         status = ocfs2_mark_inode_dirty(handle, inode, bh);
1266         if (status < 0)
1267                 mlog_errno(status);
1268
1269 bail_commit:
1270         ocfs2_commit_trans(osb, handle);
1271 bail_unlock:
1272         ocfs2_inode_unlock(inode, 1);
1273 bail_unlock_rw:
1274         if (size_change)
1275                 ocfs2_rw_unlock(inode, 1);
1276 bail:
1277         brelse(bh);
1278
1279         /* Release quota pointers in case we acquired them */
1280         for (qtype = 0; qtype < MAXQUOTAS; qtype++)
1281                 dqput(transfer_to[qtype]);
1282
1283         if (!status && attr->ia_valid & ATTR_MODE) {
1284                 status = ocfs2_acl_chmod(inode);
1285                 if (status < 0)
1286                         mlog_errno(status);
1287         }
1288
1289         mlog_exit(status);
1290         return status;
1291 }
1292
1293 int ocfs2_getattr(struct vfsmount *mnt,
1294                   struct dentry *dentry,
1295                   struct kstat *stat)
1296 {
1297         struct inode *inode = dentry->d_inode;
1298         struct super_block *sb = dentry->d_inode->i_sb;
1299         struct ocfs2_super *osb = sb->s_fs_info;
1300         int err;
1301
1302         mlog_entry_void();
1303
1304         err = ocfs2_inode_revalidate(dentry);
1305         if (err) {
1306                 if (err != -ENOENT)
1307                         mlog_errno(err);
1308                 goto bail;
1309         }
1310
1311         generic_fillattr(inode, stat);
1312
1313         /* We set the blksize from the cluster size for performance */
1314         stat->blksize = osb->s_clustersize;
1315
1316 bail:
1317         mlog_exit(err);
1318
1319         return err;
1320 }
1321
1322 int ocfs2_permission(struct inode *inode, int mask)
1323 {
1324         int ret;
1325
1326         mlog_entry_void();
1327
1328         ret = ocfs2_inode_lock(inode, NULL, 0);
1329         if (ret) {
1330                 if (ret != -ENOENT)
1331                         mlog_errno(ret);
1332                 goto out;
1333         }
1334
1335         ret = generic_permission(inode, mask, ocfs2_check_acl);
1336
1337         ocfs2_inode_unlock(inode, 0);
1338 out:
1339         mlog_exit(ret);
1340         return ret;
1341 }
1342
1343 static int __ocfs2_write_remove_suid(struct inode *inode,
1344                                      struct buffer_head *bh)
1345 {
1346         int ret;
1347         handle_t *handle;
1348         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1349         struct ocfs2_dinode *di;
1350
1351         mlog_entry("(Inode %llu, mode 0%o)\n",
1352                    (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
1353
1354         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1355         if (IS_ERR(handle)) {
1356                 ret = PTR_ERR(handle);
1357                 mlog_errno(ret);
1358                 goto out;
1359         }
1360
1361         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1362                                       OCFS2_JOURNAL_ACCESS_WRITE);
1363         if (ret < 0) {
1364                 mlog_errno(ret);
1365                 goto out_trans;
1366         }
1367
1368         inode->i_mode &= ~S_ISUID;
1369         if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1370                 inode->i_mode &= ~S_ISGID;
1371
1372         di = (struct ocfs2_dinode *) bh->b_data;
1373         di->i_mode = cpu_to_le16(inode->i_mode);
1374
1375         ocfs2_journal_dirty(handle, bh);
1376
1377 out_trans:
1378         ocfs2_commit_trans(osb, handle);
1379 out:
1380         mlog_exit(ret);
1381         return ret;
1382 }
1383
1384 /*
1385  * Will look for holes and unwritten extents in the range starting at
1386  * pos for count bytes (inclusive).
1387  */
1388 static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1389                                        size_t count)
1390 {
1391         int ret = 0;
1392         unsigned int extent_flags;
1393         u32 cpos, clusters, extent_len, phys_cpos;
1394         struct super_block *sb = inode->i_sb;
1395
1396         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1397         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1398
1399         while (clusters) {
1400                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1401                                          &extent_flags);
1402                 if (ret < 0) {
1403                         mlog_errno(ret);
1404                         goto out;
1405                 }
1406
1407                 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1408                         ret = 1;
1409                         break;
1410                 }
1411
1412                 if (extent_len > clusters)
1413                         extent_len = clusters;
1414
1415                 clusters -= extent_len;
1416                 cpos += extent_len;
1417         }
1418 out:
1419         return ret;
1420 }
1421
1422 static int ocfs2_write_remove_suid(struct inode *inode)
1423 {
1424         int ret;
1425         struct buffer_head *bh = NULL;
1426
1427         ret = ocfs2_read_inode_block(inode, &bh);
1428         if (ret < 0) {
1429                 mlog_errno(ret);
1430                 goto out;
1431         }
1432
1433         ret =  __ocfs2_write_remove_suid(inode, bh);
1434 out:
1435         brelse(bh);
1436         return ret;
1437 }
1438
1439 /*
1440  * Allocate enough extents to cover the region starting at byte offset
1441  * start for len bytes. Existing extents are skipped, any extents
1442  * added are marked as "unwritten".
1443  */
1444 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1445                                             u64 start, u64 len)
1446 {
1447         int ret;
1448         u32 cpos, phys_cpos, clusters, alloc_size;
1449         u64 end = start + len;
1450         struct buffer_head *di_bh = NULL;
1451
1452         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1453                 ret = ocfs2_read_inode_block(inode, &di_bh);
1454                 if (ret) {
1455                         mlog_errno(ret);
1456                         goto out;
1457                 }
1458
1459                 /*
1460                  * Nothing to do if the requested reservation range
1461                  * fits within the inode.
1462                  */
1463                 if (ocfs2_size_fits_inline_data(di_bh, end))
1464                         goto out;
1465
1466                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1467                 if (ret) {
1468                         mlog_errno(ret);
1469                         goto out;
1470                 }
1471         }
1472
1473         /*
1474          * We consider both start and len to be inclusive.
1475          */
1476         cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1477         clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1478         clusters -= cpos;
1479
1480         while (clusters) {
1481                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1482                                          &alloc_size, NULL);
1483                 if (ret) {
1484                         mlog_errno(ret);
1485                         goto out;
1486                 }
1487
1488                 /*
1489                  * Hole or existing extent len can be arbitrary, so
1490                  * cap it to our own allocation request.
1491                  */
1492                 if (alloc_size > clusters)
1493                         alloc_size = clusters;
1494
1495                 if (phys_cpos) {
1496                         /*
1497                          * We already have an allocation at this
1498                          * region so we can safely skip it.
1499                          */
1500                         goto next;
1501                 }
1502
1503                 ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1504                 if (ret) {
1505                         if (ret != -ENOSPC)
1506                                 mlog_errno(ret);
1507                         goto out;
1508                 }
1509
1510 next:
1511                 cpos += alloc_size;
1512                 clusters -= alloc_size;
1513         }
1514
1515         ret = 0;
1516 out:
1517
1518         brelse(di_bh);
1519         return ret;
1520 }
1521
1522 /*
1523  * Truncate a byte range, avoiding pages within partial clusters. This
1524  * preserves those pages for the zeroing code to write to.
1525  */
1526 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1527                                          u64 byte_len)
1528 {
1529         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1530         loff_t start, end;
1531         struct address_space *mapping = inode->i_mapping;
1532
1533         start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1534         end = byte_start + byte_len;
1535         end = end & ~(osb->s_clustersize - 1);
1536
1537         if (start < end) {
1538                 unmap_mapping_range(mapping, start, end - start, 0);
1539                 truncate_inode_pages_range(mapping, start, end - 1);
1540         }
1541 }
1542
1543 static int ocfs2_zero_partial_clusters(struct inode *inode,
1544                                        u64 start, u64 len)
1545 {
1546         int ret = 0;
1547         u64 tmpend, end = start + len;
1548         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1549         unsigned int csize = osb->s_clustersize;
1550         handle_t *handle;
1551
1552         /*
1553          * The "start" and "end" values are NOT necessarily part of
1554          * the range whose allocation is being deleted. Rather, this
1555          * is what the user passed in with the request. We must zero
1556          * partial clusters here. There's no need to worry about
1557          * physical allocation - the zeroing code knows to skip holes.
1558          */
1559         mlog(0, "byte start: %llu, end: %llu\n",
1560              (unsigned long long)start, (unsigned long long)end);
1561
1562         /*
1563          * If both edges are on a cluster boundary then there's no
1564          * zeroing required as the region is part of the allocation to
1565          * be truncated.
1566          */
1567         if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1568                 goto out;
1569
1570         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1571         if (IS_ERR(handle)) {
1572                 ret = PTR_ERR(handle);
1573                 mlog_errno(ret);
1574                 goto out;
1575         }
1576
1577         /*
1578          * We want to get the byte offset of the end of the 1st cluster.
1579          */
1580         tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1581         if (tmpend > end)
1582                 tmpend = end;
1583
1584         mlog(0, "1st range: start: %llu, tmpend: %llu\n",
1585              (unsigned long long)start, (unsigned long long)tmpend);
1586
1587         ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1588         if (ret)
1589                 mlog_errno(ret);
1590
1591         if (tmpend < end) {
1592                 /*
1593                  * This may make start and end equal, but the zeroing
1594                  * code will skip any work in that case so there's no
1595                  * need to catch it up here.
1596                  */
1597                 start = end & ~(osb->s_clustersize - 1);
1598
1599                 mlog(0, "2nd range: start: %llu, end: %llu\n",
1600                      (unsigned long long)start, (unsigned long long)end);
1601
1602                 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1603                 if (ret)
1604                         mlog_errno(ret);
1605         }
1606
1607         ocfs2_commit_trans(osb, handle);
1608 out:
1609         return ret;
1610 }
1611
1612 static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1613 {
1614         int i;
1615         struct ocfs2_extent_rec *rec = NULL;
1616
1617         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1618
1619                 rec = &el->l_recs[i];
1620
1621                 if (le32_to_cpu(rec->e_cpos) < pos)
1622                         break;
1623         }
1624
1625         return i;
1626 }
1627
1628 /*
1629  * Helper to calculate the punching pos and length in one run, we handle the
1630  * following three cases in order:
1631  *
1632  * - remove the entire record
1633  * - remove a partial record
1634  * - no record needs to be removed (hole-punching completed)
1635 */
1636 static void ocfs2_calc_trunc_pos(struct inode *inode,
1637                                  struct ocfs2_extent_list *el,
1638                                  struct ocfs2_extent_rec *rec,
1639                                  u32 trunc_start, u32 *trunc_cpos,
1640                                  u32 *trunc_len, u32 *trunc_end,
1641                                  u64 *blkno, int *done)
1642 {
1643         int ret = 0;
1644         u32 coff, range;
1645
1646         range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1647
1648         if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1649                 *trunc_cpos = le32_to_cpu(rec->e_cpos);
1650                 /*
1651                  * Skip holes if any.
1652                  */
1653                 if (range < *trunc_end)
1654                         *trunc_end = range;
1655                 *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1656                 *blkno = le64_to_cpu(rec->e_blkno);
1657                 *trunc_end = le32_to_cpu(rec->e_cpos);
1658         } else if (range > trunc_start) {
1659                 *trunc_cpos = trunc_start;
1660                 *trunc_len = *trunc_end - trunc_start;
1661                 coff = trunc_start - le32_to_cpu(rec->e_cpos);
1662                 *blkno = le64_to_cpu(rec->e_blkno) +
1663                                 ocfs2_clusters_to_blocks(inode->i_sb, coff);
1664                 *trunc_end = trunc_start;
1665         } else {
1666                 /*
1667                  * It may have two following possibilities:
1668                  *
1669                  * - last record has been removed
1670                  * - trunc_start was within a hole
1671                  *
1672                  * both two cases mean the completion of hole punching.
1673                  */
1674                 ret = 1;
1675         }
1676
1677         *done = ret;
1678 }
1679
1680 static int ocfs2_remove_inode_range(struct inode *inode,
1681                                     struct buffer_head *di_bh, u64 byte_start,
1682                                     u64 byte_len)
1683 {
1684         int ret = 0, flags = 0, done = 0, i;
1685         u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1686         u32 cluster_in_el;
1687         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1688         struct ocfs2_cached_dealloc_ctxt dealloc;
1689         struct address_space *mapping = inode->i_mapping;
1690         struct ocfs2_extent_tree et;
1691         struct ocfs2_path *path = NULL;
1692         struct ocfs2_extent_list *el = NULL;
1693         struct ocfs2_extent_rec *rec = NULL;
1694         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1695         u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1696
1697         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1698         ocfs2_init_dealloc_ctxt(&dealloc);
1699
1700         if (byte_len == 0)
1701                 return 0;
1702
1703         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1704                 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1705                                             byte_start + byte_len, 0);
1706                 if (ret) {
1707                         mlog_errno(ret);
1708                         goto out;
1709                 }
1710                 /*
1711                  * There's no need to get fancy with the page cache
1712                  * truncate of an inline-data inode. We're talking
1713                  * about less than a page here, which will be cached
1714                  * in the dinode buffer anyway.
1715                  */
1716                 unmap_mapping_range(mapping, 0, 0, 0);
1717                 truncate_inode_pages(mapping, 0);
1718                 goto out;
1719         }
1720
1721         /*
1722          * For reflinks, we may need to CoW 2 clusters which might be
1723          * partially zero'd later, if hole's start and end offset were
1724          * within one cluster(means is not exactly aligned to clustersize).
1725          */
1726
1727         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
1728
1729                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1730                 if (ret) {
1731                         mlog_errno(ret);
1732                         goto out;
1733                 }
1734
1735                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1736                 if (ret) {
1737                         mlog_errno(ret);
1738                         goto out;
1739                 }
1740         }
1741
1742         trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1743         trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1744         cluster_in_el = trunc_end;
1745
1746         mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, cend: %u\n",
1747              (unsigned long long)OCFS2_I(inode)->ip_blkno,
1748              (unsigned long long)byte_start,
1749              (unsigned long long)byte_len, trunc_start, trunc_end);
1750
1751         ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1752         if (ret) {
1753                 mlog_errno(ret);
1754                 goto out;
1755         }
1756
1757         path = ocfs2_new_path_from_et(&et);
1758         if (!path) {
1759                 ret = -ENOMEM;
1760                 mlog_errno(ret);
1761                 goto out;
1762         }
1763
1764         while (trunc_end > trunc_start) {
1765
1766                 ret = ocfs2_find_path(INODE_CACHE(inode), path,
1767                                       cluster_in_el);
1768                 if (ret) {
1769                         mlog_errno(ret);
1770                         goto out;
1771                 }
1772
1773                 el = path_leaf_el(path);
1774
1775                 i = ocfs2_find_rec(el, trunc_end);
1776                 /*
1777                  * Need to go to previous extent block.
1778                  */
1779                 if (i < 0) {
1780                         if (path->p_tree_depth == 0)
1781                                 break;
1782
1783                         ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1784                                                             path,
1785                                                             &cluster_in_el);
1786                         if (ret) {
1787                                 mlog_errno(ret);
1788                                 goto out;
1789                         }
1790
1791                         /*
1792                          * We've reached the leftmost extent block,
1793                          * it's safe to leave.
1794                          */
1795                         if (cluster_in_el == 0)
1796                                 break;
1797
1798                         /*
1799                          * The 'pos' searched for previous extent block is
1800                          * always one cluster less than actual trunc_end.
1801                          */
1802                         trunc_end = cluster_in_el + 1;
1803
1804                         ocfs2_reinit_path(path, 1);
1805
1806                         continue;
1807
1808                 } else
1809                         rec = &el->l_recs[i];
1810
1811                 ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1812                                      &trunc_len, &trunc_end, &blkno, &done);
1813                 if (done)
1814                         break;
1815
1816                 flags = rec->e_flags;
1817                 phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1818
1819                 ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1820                                                phys_cpos, trunc_len, flags,
1821                                                &dealloc, refcount_loc);
1822                 if (ret < 0) {
1823                         mlog_errno(ret);
1824                         goto out;
1825                 }
1826
1827                 cluster_in_el = trunc_end;
1828
1829                 ocfs2_reinit_path(path, 1);
1830         }
1831
1832         ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1833
1834 out:
1835         ocfs2_schedule_truncate_log_flush(osb, 1);
1836         ocfs2_run_deallocs(osb, &dealloc);
1837
1838         return ret;
1839 }
1840
1841 /*
1842  * Parts of this function taken from xfs_change_file_space()
1843  */
1844 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1845                                      loff_t f_pos, unsigned int cmd,
1846                                      struct ocfs2_space_resv *sr,
1847                                      int change_size)
1848 {
1849         int ret;
1850         s64 llen;
1851         loff_t size;
1852         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1853         struct buffer_head *di_bh = NULL;
1854         handle_t *handle;
1855         unsigned long long max_off = inode->i_sb->s_maxbytes;
1856
1857         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1858                 return -EROFS;
1859
1860         mutex_lock(&inode->i_mutex);
1861
1862         /*
1863          * This prevents concurrent writes on other nodes
1864          */
1865         ret = ocfs2_rw_lock(inode, 1);
1866         if (ret) {
1867                 mlog_errno(ret);
1868                 goto out;
1869         }
1870
1871         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1872         if (ret) {
1873                 mlog_errno(ret);
1874                 goto out_rw_unlock;
1875         }
1876
1877         if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1878                 ret = -EPERM;
1879                 goto out_inode_unlock;
1880         }
1881
1882         switch (sr->l_whence) {
1883         case 0: /*SEEK_SET*/
1884                 break;
1885         case 1: /*SEEK_CUR*/
1886                 sr->l_start += f_pos;
1887                 break;
1888         case 2: /*SEEK_END*/
1889                 sr->l_start += i_size_read(inode);
1890                 break;
1891         default:
1892                 ret = -EINVAL;
1893                 goto out_inode_unlock;
1894         }
1895         sr->l_whence = 0;
1896
1897         llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1898
1899         if (sr->l_start < 0
1900             || sr->l_start > max_off
1901             || (sr->l_start + llen) < 0
1902             || (sr->l_start + llen) > max_off) {
1903                 ret = -EINVAL;
1904                 goto out_inode_unlock;
1905         }
1906         size = sr->l_start + sr->l_len;
1907
1908         if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
1909                 if (sr->l_len <= 0) {
1910                         ret = -EINVAL;
1911                         goto out_inode_unlock;
1912                 }
1913         }
1914
1915         if (file && should_remove_suid(file->f_path.dentry)) {
1916                 ret = __ocfs2_write_remove_suid(inode, di_bh);
1917                 if (ret) {
1918                         mlog_errno(ret);
1919                         goto out_inode_unlock;
1920                 }
1921         }
1922
1923         down_write(&OCFS2_I(inode)->ip_alloc_sem);
1924         switch (cmd) {
1925         case OCFS2_IOC_RESVSP:
1926         case OCFS2_IOC_RESVSP64:
1927                 /*
1928                  * This takes unsigned offsets, but the signed ones we
1929                  * pass have been checked against overflow above.
1930                  */
1931                 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1932                                                        sr->l_len);
1933                 break;
1934         case OCFS2_IOC_UNRESVSP:
1935         case OCFS2_IOC_UNRESVSP64:
1936                 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1937                                                sr->l_len);
1938                 break;
1939         default:
1940                 ret = -EINVAL;
1941         }
1942         up_write(&OCFS2_I(inode)->ip_alloc_sem);
1943         if (ret) {
1944                 mlog_errno(ret);
1945                 goto out_inode_unlock;
1946         }
1947
1948         /*
1949          * We update c/mtime for these changes
1950          */
1951         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1952         if (IS_ERR(handle)) {
1953                 ret = PTR_ERR(handle);
1954                 mlog_errno(ret);
1955                 goto out_inode_unlock;
1956         }
1957
1958         if (change_size && i_size_read(inode) < size)
1959                 i_size_write(inode, size);
1960
1961         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1962         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1963         if (ret < 0)
1964                 mlog_errno(ret);
1965
1966         ocfs2_commit_trans(osb, handle);
1967
1968 out_inode_unlock:
1969         brelse(di_bh);
1970         ocfs2_inode_unlock(inode, 1);
1971 out_rw_unlock:
1972         ocfs2_rw_unlock(inode, 1);
1973
1974 out:
1975         mutex_unlock(&inode->i_mutex);
1976         return ret;
1977 }
1978
1979 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1980                             struct ocfs2_space_resv *sr)
1981 {
1982         struct inode *inode = file->f_path.dentry->d_inode;
1983         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1984
1985         if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1986             !ocfs2_writes_unwritten_extents(osb))
1987                 return -ENOTTY;
1988         else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1989                  !ocfs2_sparse_alloc(osb))
1990                 return -ENOTTY;
1991
1992         if (!S_ISREG(inode->i_mode))
1993                 return -EINVAL;
1994
1995         if (!(file->f_mode & FMODE_WRITE))
1996                 return -EBADF;
1997
1998         return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1999 }
2000
2001 static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset,
2002                             loff_t len)
2003 {
2004         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2005         struct ocfs2_space_resv sr;
2006         int change_size = 1;
2007
2008         if (!ocfs2_writes_unwritten_extents(osb))
2009                 return -EOPNOTSUPP;
2010
2011         if (S_ISDIR(inode->i_mode))
2012                 return -ENODEV;
2013
2014         if (mode & FALLOC_FL_KEEP_SIZE)
2015                 change_size = 0;
2016
2017         sr.l_whence = 0;
2018         sr.l_start = (s64)offset;
2019         sr.l_len = (s64)len;
2020
2021         return __ocfs2_change_file_space(NULL, inode, offset,
2022                                          OCFS2_IOC_RESVSP64, &sr, change_size);
2023 }
2024
2025 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2026                                    size_t count)
2027 {
2028         int ret = 0;
2029         unsigned int extent_flags;
2030         u32 cpos, clusters, extent_len, phys_cpos;
2031         struct super_block *sb = inode->i_sb;
2032
2033         if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2034             !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
2035             OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2036                 return 0;
2037
2038         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2039         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2040
2041         while (clusters) {
2042                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2043                                          &extent_flags);
2044                 if (ret < 0) {
2045                         mlog_errno(ret);
2046                         goto out;
2047                 }
2048
2049                 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2050                         ret = 1;
2051                         break;
2052                 }
2053
2054                 if (extent_len > clusters)
2055                         extent_len = clusters;
2056
2057                 clusters -= extent_len;
2058                 cpos += extent_len;
2059         }
2060 out:
2061         return ret;
2062 }
2063
2064 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
2065                                             loff_t pos, size_t count,
2066                                             int *meta_level)
2067 {
2068         int ret;
2069         struct buffer_head *di_bh = NULL;
2070         u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2071         u32 clusters =
2072                 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2073
2074         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2075         if (ret) {
2076                 mlog_errno(ret);
2077                 goto out;
2078         }
2079
2080         *meta_level = 1;
2081
2082         ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
2083         if (ret)
2084                 mlog_errno(ret);
2085 out:
2086         brelse(di_bh);
2087         return ret;
2088 }
2089
2090 static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
2091                                          loff_t *ppos,
2092                                          size_t count,
2093                                          int appending,
2094                                          int *direct_io,
2095                                          int *has_refcount)
2096 {
2097         int ret = 0, meta_level = 0;
2098         struct inode *inode = dentry->d_inode;
2099         loff_t saved_pos, end;
2100
2101         /*
2102          * We start with a read level meta lock and only jump to an ex
2103          * if we need to make modifications here.
2104          */
2105         for(;;) {
2106                 ret = ocfs2_inode_lock(inode, NULL, meta_level);
2107                 if (ret < 0) {
2108                         meta_level = -1;
2109                         mlog_errno(ret);
2110                         goto out;
2111                 }
2112
2113                 /* Clear suid / sgid if necessary. We do this here
2114                  * instead of later in the write path because
2115                  * remove_suid() calls ->setattr without any hint that
2116                  * we may have already done our cluster locking. Since
2117                  * ocfs2_setattr() *must* take cluster locks to
2118                  * proceeed, this will lead us to recursively lock the
2119                  * inode. There's also the dinode i_size state which
2120                  * can be lost via setattr during extending writes (we
2121                  * set inode->i_size at the end of a write. */
2122                 if (should_remove_suid(dentry)) {
2123                         if (meta_level == 0) {
2124                                 ocfs2_inode_unlock(inode, meta_level);
2125                                 meta_level = 1;
2126                                 continue;
2127                         }
2128
2129                         ret = ocfs2_write_remove_suid(inode);
2130                         if (ret < 0) {
2131                                 mlog_errno(ret);
2132                                 goto out_unlock;
2133                         }
2134                 }
2135
2136                 /* work on a copy of ppos until we're sure that we won't have
2137                  * to recalculate it due to relocking. */
2138                 if (appending) {
2139                         saved_pos = i_size_read(inode);
2140                         mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
2141                 } else {
2142                         saved_pos = *ppos;
2143                 }
2144
2145                 end = saved_pos + count;
2146
2147                 ret = ocfs2_check_range_for_refcount(inode, saved_pos, count);
2148                 if (ret == 1) {
2149                         ocfs2_inode_unlock(inode, meta_level);
2150                         meta_level = -1;
2151
2152                         ret = ocfs2_prepare_inode_for_refcount(inode,
2153                                                                saved_pos,
2154                                                                count,
2155                                                                &meta_level);
2156                         if (has_refcount)
2157                                 *has_refcount = 1;
2158                         if (direct_io)
2159                                 *direct_io = 0;
2160                 }
2161
2162                 if (ret < 0) {
2163                         mlog_errno(ret);
2164                         goto out_unlock;
2165                 }
2166
2167                 /*
2168                  * Skip the O_DIRECT checks if we don't need
2169                  * them.
2170                  */
2171                 if (!direct_io || !(*direct_io))
2172                         break;
2173
2174                 /*
2175                  * There's no sane way to do direct writes to an inode
2176                  * with inline data.
2177                  */
2178                 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2179                         *direct_io = 0;
2180                         break;
2181                 }
2182
2183                 /*
2184                  * Allowing concurrent direct writes means
2185                  * i_size changes wouldn't be synchronized, so
2186                  * one node could wind up truncating another
2187                  * nodes writes.
2188                  */
2189                 if (end > i_size_read(inode)) {
2190                         *direct_io = 0;
2191                         break;
2192                 }
2193
2194                 /*
2195                  * We don't fill holes during direct io, so
2196                  * check for them here. If any are found, the
2197                  * caller will have to retake some cluster
2198                  * locks and initiate the io as buffered.
2199                  */
2200                 ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
2201                 if (ret == 1) {
2202                         *direct_io = 0;
2203                         ret = 0;
2204                 } else if (ret < 0)
2205                         mlog_errno(ret);
2206                 break;
2207         }
2208
2209         if (appending)
2210                 *ppos = saved_pos;
2211
2212 out_unlock:
2213         if (meta_level >= 0)
2214                 ocfs2_inode_unlock(inode, meta_level);
2215
2216 out:
2217         return ret;
2218 }
2219
2220 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
2221                                     const struct iovec *iov,
2222                                     unsigned long nr_segs,
2223                                     loff_t pos)
2224 {
2225         int ret, direct_io, appending, rw_level, have_alloc_sem  = 0;
2226         int can_do_direct, has_refcount = 0;
2227         ssize_t written = 0;
2228         size_t ocount;          /* original count */
2229         size_t count;           /* after file limit checks */
2230         loff_t old_size, *ppos = &iocb->ki_pos;
2231         u32 old_clusters;
2232         struct file *file = iocb->ki_filp;
2233         struct inode *inode = file->f_path.dentry->d_inode;
2234         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2235
2236         mlog_entry("(0x%p, %u, '%.*s')\n", file,
2237                    (unsigned int)nr_segs,
2238                    file->f_path.dentry->d_name.len,
2239                    file->f_path.dentry->d_name.name);
2240
2241         if (iocb->ki_left == 0)
2242                 return 0;
2243
2244         vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
2245
2246         appending = file->f_flags & O_APPEND ? 1 : 0;
2247         direct_io = file->f_flags & O_DIRECT ? 1 : 0;
2248
2249         mutex_lock(&inode->i_mutex);
2250
2251 relock:
2252         /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
2253         if (direct_io) {
2254                 down_read(&inode->i_alloc_sem);
2255                 have_alloc_sem = 1;
2256         }
2257
2258         /* concurrent O_DIRECT writes are allowed */
2259         rw_level = !direct_io;
2260         ret = ocfs2_rw_lock(inode, rw_level);
2261         if (ret < 0) {
2262                 mlog_errno(ret);
2263                 goto out_sems;
2264         }
2265
2266         can_do_direct = direct_io;
2267         ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos,
2268                                             iocb->ki_left, appending,
2269                                             &can_do_direct, &has_refcount);
2270         if (ret < 0) {
2271                 mlog_errno(ret);
2272                 goto out;
2273         }
2274
2275         /*
2276          * We can't complete the direct I/O as requested, fall back to
2277          * buffered I/O.
2278          */
2279         if (direct_io && !can_do_direct) {
2280                 ocfs2_rw_unlock(inode, rw_level);
2281                 up_read(&inode->i_alloc_sem);
2282
2283                 have_alloc_sem = 0;
2284                 rw_level = -1;
2285
2286                 direct_io = 0;
2287                 goto relock;
2288         }
2289
2290         /*
2291          * To later detect whether a journal commit for sync writes is
2292          * necessary, we sample i_size, and cluster count here.
2293          */
2294         old_size = i_size_read(inode);
2295         old_clusters = OCFS2_I(inode)->ip_clusters;
2296
2297         /* communicate with ocfs2_dio_end_io */
2298         ocfs2_iocb_set_rw_locked(iocb, rw_level);
2299
2300         ret = generic_segment_checks(iov, &nr_segs, &ocount,
2301                                      VERIFY_READ);
2302         if (ret)
2303                 goto out_dio;
2304
2305         count = ocount;
2306         ret = generic_write_checks(file, ppos, &count,
2307                                    S_ISBLK(inode->i_mode));
2308         if (ret)
2309                 goto out_dio;
2310
2311         if (direct_io) {
2312                 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
2313                                                     ppos, count, ocount);
2314                 if (written < 0) {
2315                         /*
2316                          * direct write may have instantiated a few
2317                          * blocks outside i_size. Trim these off again.
2318                          * Don't need i_size_read because we hold i_mutex.
2319                          *
2320                          * XXX(truncate): this looks buggy because ocfs2 did not
2321                          * actually implement ->truncate.  Take a look at
2322                          * the new truncate sequence and update this accordingly
2323                          */
2324                         if (*ppos + count > inode->i_size)
2325                                 truncate_setsize(inode, inode->i_size);
2326                         ret = written;
2327                         goto out_dio;
2328                 }
2329         } else {
2330                 current->backing_dev_info = file->f_mapping->backing_dev_info;
2331                 written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos,
2332                                                       ppos, count, 0);
2333                 current->backing_dev_info = NULL;
2334         }
2335
2336 out_dio:
2337         /* buffered aio wouldn't have proper lock coverage today */
2338         BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2339
2340         if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
2341             ((file->f_flags & O_DIRECT) && !direct_io)) {
2342                 ret = filemap_fdatawrite_range(file->f_mapping, pos,
2343                                                pos + count - 1);
2344                 if (ret < 0)
2345                         written = ret;
2346
2347                 if (!ret && ((old_size != i_size_read(inode)) ||
2348                              (old_clusters != OCFS2_I(inode)->ip_clusters) ||
2349                              has_refcount)) {
2350                         ret = jbd2_journal_force_commit(osb->journal->j_journal);
2351                         if (ret < 0)
2352                                 written = ret;
2353                 }
2354
2355                 if (!ret)
2356                         ret = filemap_fdatawait_range(file->f_mapping, pos,
2357                                                       pos + count - 1);
2358         }
2359
2360         /*
2361          * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2362          * function pointer which is called when o_direct io completes so that
2363          * it can unlock our rw lock.  (it's the clustered equivalent of
2364          * i_alloc_sem; protects truncate from racing with pending ios).
2365          * Unfortunately there are error cases which call end_io and others
2366          * that don't.  so we don't have to unlock the rw_lock if either an
2367          * async dio is going to do it in the future or an end_io after an
2368          * error has already done it.
2369          */
2370         if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2371                 rw_level = -1;
2372                 have_alloc_sem = 0;
2373         }
2374
2375 out:
2376         if (rw_level != -1)
2377                 ocfs2_rw_unlock(inode, rw_level);
2378
2379 out_sems:
2380         if (have_alloc_sem)
2381                 up_read(&inode->i_alloc_sem);
2382
2383         mutex_unlock(&inode->i_mutex);
2384
2385         if (written)
2386                 ret = written;
2387         mlog_exit(ret);
2388         return ret;
2389 }
2390
2391 static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
2392                                 struct file *out,
2393                                 struct splice_desc *sd)
2394 {
2395         int ret;
2396
2397         ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, &sd->pos,
2398                                             sd->total_len, 0, NULL, NULL);
2399         if (ret < 0) {
2400                 mlog_errno(ret);
2401                 return ret;
2402         }
2403
2404         return splice_from_pipe_feed(pipe, sd, pipe_to_file);
2405 }
2406
2407 static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2408                                        struct file *out,
2409                                        loff_t *ppos,
2410                                        size_t len,
2411                                        unsigned int flags)
2412 {
2413         int ret;
2414         struct address_space *mapping = out->f_mapping;
2415         struct inode *inode = mapping->host;
2416         struct splice_desc sd = {
2417                 .total_len = len,
2418                 .flags = flags,
2419                 .pos = *ppos,
2420                 .u.file = out,
2421         };
2422
2423         mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
2424                    (unsigned int)len,
2425                    out->f_path.dentry->d_name.len,
2426                    out->f_path.dentry->d_name.name);
2427
2428         if (pipe->inode)
2429                 mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT);
2430
2431         splice_from_pipe_begin(&sd);
2432         do {
2433                 ret = splice_from_pipe_next(pipe, &sd);
2434                 if (ret <= 0)
2435                         break;
2436
2437                 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2438                 ret = ocfs2_rw_lock(inode, 1);
2439                 if (ret < 0)
2440                         mlog_errno(ret);
2441                 else {
2442                         ret = ocfs2_splice_to_file(pipe, out, &sd);
2443                         ocfs2_rw_unlock(inode, 1);
2444                 }
2445                 mutex_unlock(&inode->i_mutex);
2446         } while (ret > 0);
2447         splice_from_pipe_end(pipe, &sd);
2448
2449         if (pipe->inode)
2450                 mutex_unlock(&pipe->inode->i_mutex);
2451
2452         if (sd.num_spliced)
2453                 ret = sd.num_spliced;
2454
2455         if (ret > 0) {
2456                 unsigned long nr_pages;
2457                 int err;
2458
2459                 nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
2460
2461                 err = generic_write_sync(out, *ppos, ret);
2462                 if (err)
2463                         ret = err;
2464                 else
2465                         *ppos += ret;
2466
2467                 balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
2468         }
2469
2470         mlog_exit(ret);
2471         return ret;
2472 }
2473
2474 static ssize_t ocfs2_file_splice_read(struct file *in,
2475                                       loff_t *ppos,
2476                                       struct pipe_inode_info *pipe,
2477                                       size_t len,
2478                                       unsigned int flags)
2479 {
2480         int ret = 0, lock_level = 0;
2481         struct inode *inode = in->f_path.dentry->d_inode;
2482
2483         mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
2484                    (unsigned int)len,
2485                    in->f_path.dentry->d_name.len,
2486                    in->f_path.dentry->d_name.name);
2487
2488         /*
2489          * See the comment in ocfs2_file_aio_read()
2490          */
2491         ret = ocfs2_inode_lock_atime(inode, in->f_vfsmnt, &lock_level);
2492         if (ret < 0) {
2493                 mlog_errno(ret);
2494                 goto bail;
2495         }
2496         ocfs2_inode_unlock(inode, lock_level);
2497
2498         ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2499
2500 bail:
2501         mlog_exit(ret);
2502         return ret;
2503 }
2504
2505 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2506                                    const struct iovec *iov,
2507                                    unsigned long nr_segs,
2508                                    loff_t pos)
2509 {
2510         int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2511         struct file *filp = iocb->ki_filp;
2512         struct inode *inode = filp->f_path.dentry->d_inode;
2513
2514         mlog_entry("(0x%p, %u, '%.*s')\n", filp,
2515                    (unsigned int)nr_segs,
2516                    filp->f_path.dentry->d_name.len,
2517                    filp->f_path.dentry->d_name.name);
2518
2519         if (!inode) {
2520                 ret = -EINVAL;
2521                 mlog_errno(ret);
2522                 goto bail;
2523         }
2524
2525         /*
2526          * buffered reads protect themselves in ->readpage().  O_DIRECT reads
2527          * need locks to protect pending reads from racing with truncate.
2528          */
2529         if (filp->f_flags & O_DIRECT) {
2530                 down_read(&inode->i_alloc_sem);
2531                 have_alloc_sem = 1;
2532
2533                 ret = ocfs2_rw_lock(inode, 0);
2534                 if (ret < 0) {
2535                         mlog_errno(ret);
2536                         goto bail;
2537                 }
2538                 rw_level = 0;
2539                 /* communicate with ocfs2_dio_end_io */
2540                 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2541         }
2542
2543         /*
2544          * We're fine letting folks race truncates and extending
2545          * writes with read across the cluster, just like they can
2546          * locally. Hence no rw_lock during read.
2547          *
2548          * Take and drop the meta data lock to update inode fields
2549          * like i_size. This allows the checks down below
2550          * generic_file_aio_read() a chance of actually working.
2551          */
2552         ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2553         if (ret < 0) {
2554                 mlog_errno(ret);
2555                 goto bail;
2556         }
2557         ocfs2_inode_unlock(inode, lock_level);
2558
2559         ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2560         if (ret == -EINVAL)
2561                 mlog(0, "generic_file_aio_read returned -EINVAL\n");
2562
2563         /* buffered aio wouldn't have proper lock coverage today */
2564         BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2565
2566         /* see ocfs2_file_aio_write */
2567         if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2568                 rw_level = -1;
2569                 have_alloc_sem = 0;
2570         }
2571
2572 bail:
2573         if (have_alloc_sem)
2574                 up_read(&inode->i_alloc_sem);
2575         if (rw_level != -1)
2576                 ocfs2_rw_unlock(inode, rw_level);
2577         mlog_exit(ret);
2578
2579         return ret;
2580 }
2581
2582 const struct inode_operations ocfs2_file_iops = {
2583         .setattr        = ocfs2_setattr,
2584         .getattr        = ocfs2_getattr,
2585         .permission     = ocfs2_permission,
2586         .setxattr       = generic_setxattr,
2587         .getxattr       = generic_getxattr,
2588         .listxattr      = ocfs2_listxattr,
2589         .removexattr    = generic_removexattr,
2590         .fallocate      = ocfs2_fallocate,
2591         .fiemap         = ocfs2_fiemap,
2592 };
2593
2594 const struct inode_operations ocfs2_special_file_iops = {
2595         .setattr        = ocfs2_setattr,
2596         .getattr        = ocfs2_getattr,
2597         .permission     = ocfs2_permission,
2598 };
2599
2600 /*
2601  * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2602  * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2603  */
2604 const struct file_operations ocfs2_fops = {
2605         .llseek         = generic_file_llseek,
2606         .read           = do_sync_read,
2607         .write          = do_sync_write,
2608         .mmap           = ocfs2_mmap,
2609         .fsync          = ocfs2_sync_file,
2610         .release        = ocfs2_file_release,
2611         .open           = ocfs2_file_open,
2612         .aio_read       = ocfs2_file_aio_read,
2613         .aio_write      = ocfs2_file_aio_write,
2614         .unlocked_ioctl = ocfs2_ioctl,
2615 #ifdef CONFIG_COMPAT
2616         .compat_ioctl   = ocfs2_compat_ioctl,
2617 #endif
2618         .lock           = ocfs2_lock,
2619         .flock          = ocfs2_flock,
2620         .splice_read    = ocfs2_file_splice_read,
2621         .splice_write   = ocfs2_file_splice_write,
2622 };
2623
2624 const struct file_operations ocfs2_dops = {
2625         .llseek         = generic_file_llseek,
2626         .read           = generic_read_dir,
2627         .readdir        = ocfs2_readdir,
2628         .fsync          = ocfs2_sync_file,
2629         .release        = ocfs2_dir_release,
2630         .open           = ocfs2_dir_open,
2631         .unlocked_ioctl = ocfs2_ioctl,
2632 #ifdef CONFIG_COMPAT
2633         .compat_ioctl   = ocfs2_compat_ioctl,
2634 #endif
2635         .lock           = ocfs2_lock,
2636         .flock          = ocfs2_flock,
2637 };
2638
2639 /*
2640  * POSIX-lockless variants of our file_operations.
2641  *
2642  * These will be used if the underlying cluster stack does not support
2643  * posix file locking, if the user passes the "localflocks" mount
2644  * option, or if we have a local-only fs.
2645  *
2646  * ocfs2_flock is in here because all stacks handle UNIX file locks,
2647  * so we still want it in the case of no stack support for
2648  * plocks. Internally, it will do the right thing when asked to ignore
2649  * the cluster.
2650  */
2651 const struct file_operations ocfs2_fops_no_plocks = {
2652         .llseek         = generic_file_llseek,
2653         .read           = do_sync_read,
2654         .write          = do_sync_write,
2655         .mmap           = ocfs2_mmap,
2656         .fsync          = ocfs2_sync_file,
2657         .release        = ocfs2_file_release,
2658         .open           = ocfs2_file_open,
2659         .aio_read       = ocfs2_file_aio_read,
2660         .aio_write      = ocfs2_file_aio_write,
2661         .unlocked_ioctl = ocfs2_ioctl,
2662 #ifdef CONFIG_COMPAT
2663         .compat_ioctl   = ocfs2_compat_ioctl,
2664 #endif
2665         .flock          = ocfs2_flock,
2666         .splice_read    = ocfs2_file_splice_read,
2667         .splice_write   = ocfs2_file_splice_write,
2668 };
2669
2670 const struct file_operations ocfs2_dops_no_plocks = {
2671         .llseek         = generic_file_llseek,
2672         .read           = generic_read_dir,
2673         .readdir        = ocfs2_readdir,
2674         .fsync          = ocfs2_sync_file,
2675         .release        = ocfs2_dir_release,
2676         .open           = ocfs2_dir_open,
2677         .unlocked_ioctl = ocfs2_ioctl,
2678 #ifdef CONFIG_COMPAT
2679         .compat_ioctl   = ocfs2_compat_ioctl,
2680 #endif
2681         .flock          = ocfs2_flock,
2682 };