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 #include <cluster/masklog.h>
  42
  43 #include "ocfs2.h"
  44
  45 #include "alloc.h"
  46 #include "aops.h"
  47 #include "dir.h"
  48 #include "dlmglue.h"
  49 #include "extent_map.h"
  50 #include "file.h"
  51 #include "sysfile.h"
  52 #include "inode.h"
  53 #include "ioctl.h"
  54 #include "journal.h"
  55 #include "locks.h"
  56 #include "mmap.h"
  57 #include "suballoc.h"
  58 #include "super.h"
  59 #include "xattr.h"
  60 #include "acl.h"
  61 #include "quota.h"
  62 #include "refcounttree.h"
  63 #include "ocfs2_trace.h"
  64
  65 #include "buffer_head_io.h"
  66
  67 static int ocfs2_init_file_private(struct inode *inode, struct file *file)
  68 {
  69         struct ocfs2_file_private *fp;
  70
  71         fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
  72         if (!fp)
  73                 return -ENOMEM;
  74
  75         fp->fp_file = file;
  76         mutex_init(&fp->fp_mutex);
  77         ocfs2_file_lock_res_init(&fp->fp_flock, fp);
  78         file->private_data = fp;
  79
  80         return 0;
  81 }
  82
  83 static void ocfs2_free_file_private(struct inode *inode, struct file *file)
  84 {
  85         struct ocfs2_file_private *fp = file->private_data;
  86         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  87
  88         if (fp) {
  89                 ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
  90                 ocfs2_lock_res_free(&fp->fp_flock);
  91                 kfree(fp);
  92                 file->private_data = NULL;
  93         }
  94 }
  95
  96 static int ocfs2_file_open(struct inode *inode, struct file *file)
  97 {
  98         int status;
  99         int mode = file->f_flags;
 100         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 101
 102         trace_ocfs2_file_open(inode, file, file->f_path.dentry,
 103                               (unsigned long long)OCFS2_I(inode)->ip_blkno,
 104                               file->f_path.dentry->d_name.len,
 105                               file->f_path.dentry->d_name.name, mode);
 106
 107         if (file->f_mode & FMODE_WRITE)
 108                 dquot_initialize(inode);
 109
 110         spin_lock(&oi->ip_lock);
 111
 112         /* Check that the inode hasn't been wiped from disk by another
 113          * node. If it hasn't then we're safe as long as we hold the
 114          * spin lock until our increment of open count. */
 115         if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
 116                 spin_unlock(&oi->ip_lock);
 117
 118                 status = -ENOENT;
 119                 goto leave;
 120         }
 121
 122         if (mode & O_DIRECT)
 123                 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
 124
 125         oi->ip_open_count++;
 126         spin_unlock(&oi->ip_lock);
 127
 128         status = ocfs2_init_file_private(inode, file);
 129         if (status) {
 130                 /*
 131                  * We want to set open count back if we're failing the
 132                  * open.
 133                  */
 134                 spin_lock(&oi->ip_lock);
 135                 oi->ip_open_count--;
 136                 spin_unlock(&oi->ip_lock);
 137         }
 138
 139 leave:
 140         return status;
 141 }
 142
 143 static int ocfs2_file_release(struct inode *inode, struct file *file)
 144 {
 145         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 146
 147         spin_lock(&oi->ip_lock);
 148         if (!--oi->ip_open_count)
 149                 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
 150
 151         trace_ocfs2_file_release(inode, file, file->f_path.dentry,
 152                                  oi->ip_blkno,
 153                                  file->f_path.dentry->d_name.len,
 154                                  file->f_path.dentry->d_name.name,
 155                                  oi->ip_open_count);
 156         spin_unlock(&oi->ip_lock);
 157
 158         ocfs2_free_file_private(inode, file);
 159
 160         return 0;
 161 }
 162
 163 static int ocfs2_dir_open(struct inode *inode, struct file *file)
 164 {
 165         return ocfs2_init_file_private(inode, file);
 166 }
 167
 168 static int ocfs2_dir_release(struct inode *inode, struct file *file)
 169 {
 170         ocfs2_free_file_private(inode, file);
 171         return 0;
 172 }
 173
 174 static int ocfs2_sync_file(struct file *file, loff_t start, loff_t end,
 175                            int datasync)
 176 {
 177         int err = 0;
 178         journal_t *journal;
 179         struct inode *inode = file->f_mapping->host;
 180         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 181
 182         trace_ocfs2_sync_file(inode, file, file->f_path.dentry,
 183                               OCFS2_I(inode)->ip_blkno,
 184                               file->f_path.dentry->d_name.len,
 185                               file->f_path.dentry->d_name.name,
 186                               (unsigned long long)datasync);
 187
 188         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 189                 return -EROFS;
 190
 191         err = filemap_write_and_wait_range(inode->i_mapping, start, end);
 192         if (err)
 193                 return err;
 194
 195         /*
 196          * Probably don't need the i_mutex at all in here, just putting it here
 197          * to be consistent with how fsync used to be called, someone more
 198          * familiar with the fs could possibly remove it.
 199          */
 200         mutex_lock(&inode->i_mutex);
 201         if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) {
 202                 /*
 203                  * We still have to flush drive's caches to get data to the
 204                  * platter
 205                  */
 206                 if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
 207                         blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
 208                 goto bail;
 209         }
 210
 211         journal = osb->journal->j_journal;
 212         err = jbd2_journal_force_commit(journal);
 213
 214 bail:
 215         if (err)
 216                 mlog_errno(err);
 217         mutex_unlock(&inode->i_mutex);
 218
 219         return (err < 0) ? -EIO : 0;
 220 }
 221
 222 int ocfs2_should_update_atime(struct inode *inode,
 223                               struct vfsmount *vfsmnt)
 224 {
 225         struct timespec now;
 226         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 227
 228         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 229                 return 0;
 230
 231         if ((inode->i_flags & S_NOATIME) ||
 232             ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
 233                 return 0;
 234
 235         /*
 236          * We can be called with no vfsmnt structure - NFSD will
 237          * sometimes do this.
 238          *
 239          * Note that our action here is different than touch_atime() -
 240          * if we can't tell whether this is a noatime mount, then we
 241          * don't know whether to trust the value of s_atime_quantum.
 242          */
 243         if (vfsmnt == NULL)
 244                 return 0;
 245
 246         if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
 247             ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 248                 return 0;
 249
 250         if (vfsmnt->mnt_flags & MNT_RELATIME) {
 251                 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
 252                     (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
 253                         return 1;
 254
 255                 return 0;
 256         }
 257
 258         now = CURRENT_TIME;
 259         if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
 260                 return 0;
 261         else
 262                 return 1;
 263 }
 264
 265 int ocfs2_update_inode_atime(struct inode *inode,
 266                              struct buffer_head *bh)
 267 {
 268         int ret;
 269         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 270         handle_t *handle;
 271         struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
 272
 273         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 274         if (IS_ERR(handle)) {
 275                 ret = PTR_ERR(handle);
 276                 mlog_errno(ret);
 277                 goto out;
 278         }
 279
 280         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 281                                       OCFS2_JOURNAL_ACCESS_WRITE);
 282         if (ret) {
 283                 mlog_errno(ret);
 284                 goto out_commit;
 285         }
 286
 287         /*
 288          * Don't use ocfs2_mark_inode_dirty() here as we don't always
 289          * have i_mutex to guard against concurrent changes to other
 290          * inode fields.
 291          */
 292         inode->i_atime = CURRENT_TIME;
 293         di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 294         di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 295         ocfs2_journal_dirty(handle, bh);
 296
 297 out_commit:
 298         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 299 out:
 300         return ret;
 301 }
 302
 303 static int ocfs2_set_inode_size(handle_t *handle,
 304                                 struct inode *inode,
 305                                 struct buffer_head *fe_bh,
 306                                 u64 new_i_size)
 307 {
 308         int status;
 309
 310         i_size_write(inode, new_i_size);
 311         inode->i_blocks = ocfs2_inode_sector_count(inode);
 312         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 313
 314         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 315         if (status < 0) {
 316                 mlog_errno(status);
 317                 goto bail;
 318         }
 319
 320 bail:
 321         return status;
 322 }
 323
 324 int ocfs2_simple_size_update(struct inode *inode,
 325                              struct buffer_head *di_bh,
 326                              u64 new_i_size)
 327 {
 328         int ret;
 329         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 330         handle_t *handle = NULL;
 331
 332         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 333         if (IS_ERR(handle)) {
 334                 ret = PTR_ERR(handle);
 335                 mlog_errno(ret);
 336                 goto out;
 337         }
 338
 339         ret = ocfs2_set_inode_size(handle, inode, di_bh,
 340                                    new_i_size);
 341         if (ret < 0)
 342                 mlog_errno(ret);
 343
 344         ocfs2_commit_trans(osb, handle);
 345 out:
 346         return ret;
 347 }
 348
 349 static int ocfs2_cow_file_pos(struct inode *inode,
 350                               struct buffer_head *fe_bh,
 351                               u64 offset)
 352 {
 353         int status;
 354         u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 355         unsigned int num_clusters = 0;
 356         unsigned int ext_flags = 0;
 357
 358         /*
 359          * If the new offset is aligned to the range of the cluster, there is
 360          * no space for ocfs2_zero_range_for_truncate to fill, so no need to
 361          * CoW either.
 362          */
 363         if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
 364                 return 0;
 365
 366         status = ocfs2_get_clusters(inode, cpos, &phys,
 367                                     &num_clusters, &ext_flags);
 368         if (status) {
 369                 mlog_errno(status);
 370                 goto out;
 371         }
 372
 373         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
 374                 goto out;
 375
 376         return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1);
 377
 378 out:
 379         return status;
 380 }
 381
 382 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
 383                                      struct inode *inode,
 384                                      struct buffer_head *fe_bh,
 385                                      u64 new_i_size)
 386 {
 387         int status;
 388         handle_t *handle;
 389         struct ocfs2_dinode *di;
 390         u64 cluster_bytes;
 391
 392         /*
 393          * We need to CoW the cluster contains the offset if it is reflinked
 394          * since we will call ocfs2_zero_range_for_truncate later which will
 395          * write "0" from offset to the end of the cluster.
 396          */
 397         status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
 398         if (status) {
 399                 mlog_errno(status);
 400                 return status;
 401         }
 402
 403         /* TODO: This needs to actually orphan the inode in this
 404          * transaction. */
 405
 406         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 407         if (IS_ERR(handle)) {
 408                 status = PTR_ERR(handle);
 409                 mlog_errno(status);
 410                 goto out;
 411         }
 412
 413         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 414                                          OCFS2_JOURNAL_ACCESS_WRITE);
 415         if (status < 0) {
 416                 mlog_errno(status);
 417                 goto out_commit;
 418         }
 419
 420         /*
 421          * Do this before setting i_size.
 422          */
 423         cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
 424         status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
 425                                                cluster_bytes);
 426         if (status) {
 427                 mlog_errno(status);
 428                 goto out_commit;
 429         }
 430
 431         i_size_write(inode, new_i_size);
 432         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 433
 434         di = (struct ocfs2_dinode *) fe_bh->b_data;
 435         di->i_size = cpu_to_le64(new_i_size);
 436         di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
 437         di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 438
 439         ocfs2_journal_dirty(handle, fe_bh);
 440
 441 out_commit:
 442         ocfs2_commit_trans(osb, handle);
 443 out:
 444         return status;
 445 }
 446
 447 static int ocfs2_truncate_file(struct inode *inode,
 448                                struct buffer_head *di_bh,
 449                                u64 new_i_size)
 450 {
 451         int status = 0;
 452         struct ocfs2_dinode *fe = NULL;
 453         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 454
 455         /* We trust di_bh because it comes from ocfs2_inode_lock(), which
 456          * already validated it */
 457         fe = (struct ocfs2_dinode *) di_bh->b_data;
 458
 459         trace_ocfs2_truncate_file((unsigned long long)OCFS2_I(inode)->ip_blkno,
 460                                   (unsigned long long)le64_to_cpu(fe->i_size),
 461                                   (unsigned long long)new_i_size);
 462
 463         mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
 464                         "Inode %llu, inode i_size = %lld != di "
 465                         "i_size = %llu, i_flags = 0x%x\n",
 466                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 467                         i_size_read(inode),
 468                         (unsigned long long)le64_to_cpu(fe->i_size),
 469                         le32_to_cpu(fe->i_flags));
 470
 471         if (new_i_size > le64_to_cpu(fe->i_size)) {
 472                 trace_ocfs2_truncate_file_error(
 473                         (unsigned long long)le64_to_cpu(fe->i_size),
 474                         (unsigned long long)new_i_size);
 475                 status = -EINVAL;
 476                 mlog_errno(status);
 477                 goto bail;
 478         }
 479
 480         /* lets handle the simple truncate cases before doing any more
 481          * cluster locking. */
 482         if (new_i_size == le64_to_cpu(fe->i_size))
 483                 goto bail;
 484
 485         down_write(&OCFS2_I(inode)->ip_alloc_sem);
 486
 487         ocfs2_resv_discard(&osb->osb_la_resmap,
 488                            &OCFS2_I(inode)->ip_la_data_resv);
 489
 490         /*
 491          * The inode lock forced other nodes to sync and drop their
 492          * pages, which (correctly) happens even if we have a truncate
 493          * without allocation change - ocfs2 cluster sizes can be much
 494          * greater than page size, so we have to truncate them
 495          * anyway.
 496          */
 497         unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
 498         truncate_inode_pages(inode->i_mapping, new_i_size);
 499
 500         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
 501                 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
 502                                                i_size_read(inode), 1);
 503                 if (status)
 504                         mlog_errno(status);
 505
 506                 goto bail_unlock_sem;
 507         }
 508
 509         /* alright, we're going to need to do a full blown alloc size
 510          * change. Orphan the inode so that recovery can complete the
 511          * truncate if necessary. This does the task of marking
 512          * i_size. */
 513         status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
 514         if (status < 0) {
 515                 mlog_errno(status);
 516                 goto bail_unlock_sem;
 517         }
 518
 519         status = ocfs2_commit_truncate(osb, inode, di_bh);
 520         if (status < 0) {
 521                 mlog_errno(status);
 522                 goto bail_unlock_sem;
 523         }
 524
 525         /* TODO: orphan dir cleanup here. */
 526 bail_unlock_sem:
 527         up_write(&OCFS2_I(inode)->ip_alloc_sem);
 528
 529 bail:
 530         if (!status && OCFS2_I(inode)->ip_clusters == 0)
 531                 status = ocfs2_try_remove_refcount_tree(inode, di_bh);
 532
 533         return status;
 534 }
 535
 536 /*
 537  * extend file allocation only here.
 538  * we'll update all the disk stuff, and oip->alloc_size
 539  *
 540  * expect stuff to be locked, a transaction started and enough data /
 541  * metadata reservations in the contexts.
 542  *
 543  * Will return -EAGAIN, and a reason if a restart is needed.
 544  * If passed in, *reason will always be set, even in error.
 545  */
 546 int ocfs2_add_inode_data(struct ocfs2_super *osb,
 547                          struct inode *inode,
 548                          u32 *logical_offset,
 549                          u32 clusters_to_add,
 550                          int mark_unwritten,
 551                          struct buffer_head *fe_bh,
 552                          handle_t *handle,
 553                          struct ocfs2_alloc_context *data_ac,
 554                          struct ocfs2_alloc_context *meta_ac,
 555                          enum ocfs2_alloc_restarted *reason_ret)
 556 {
 557         int ret;
 558         struct ocfs2_extent_tree et;
 559
 560         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
 561         ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
 562                                           clusters_to_add, mark_unwritten,
 563                                           data_ac, meta_ac, reason_ret);
 564
 565         return ret;
 566 }
 567
 568 static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
 569                                      u32 clusters_to_add, int mark_unwritten)
 570 {
 571         int status = 0;
 572         int restart_func = 0;
 573         int credits;
 574         u32 prev_clusters;
 575         struct buffer_head *bh = NULL;
 576         struct ocfs2_dinode *fe = NULL;
 577         handle_t *handle = NULL;
 578         struct ocfs2_alloc_context *data_ac = NULL;
 579         struct ocfs2_alloc_context *meta_ac = NULL;
 580         enum ocfs2_alloc_restarted why;
 581         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 582         struct ocfs2_extent_tree et;
 583         int did_quota = 0;
 584
 585         /*
 586          * Unwritten extent only exists for file systems which
 587          * support holes.
 588          */
 589         BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
 590
 591         status = ocfs2_read_inode_block(inode, &bh);
 592         if (status < 0) {
 593                 mlog_errno(status);
 594                 goto leave;
 595         }
 596         fe = (struct ocfs2_dinode *) bh->b_data;
 597
 598 restart_all:
 599         BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
 600
 601         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
 602         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 603                                        &data_ac, &meta_ac);
 604         if (status) {
 605                 mlog_errno(status);
 606                 goto leave;
 607         }
 608
 609         credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list);
 610         handle = ocfs2_start_trans(osb, credits);
 611         if (IS_ERR(handle)) {
 612                 status = PTR_ERR(handle);
 613                 handle = NULL;
 614                 mlog_errno(status);
 615                 goto leave;
 616         }
 617
 618 restarted_transaction:
 619         trace_ocfs2_extend_allocation(
 620                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
 621                 (unsigned long long)i_size_read(inode),
 622                 le32_to_cpu(fe->i_clusters), clusters_to_add,
 623                 why, restart_func);
 624
 625         status = dquot_alloc_space_nodirty(inode,
 626                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 627         if (status)
 628                 goto leave;
 629         did_quota = 1;
 630
 631         /* reserve a write to the file entry early on - that we if we
 632          * run out of credits in the allocation path, we can still
 633          * update i_size. */
 634         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 635                                          OCFS2_JOURNAL_ACCESS_WRITE);
 636         if (status < 0) {
 637                 mlog_errno(status);
 638                 goto leave;
 639         }
 640
 641         prev_clusters = OCFS2_I(inode)->ip_clusters;
 642
 643         status = ocfs2_add_inode_data(osb,
 644                                       inode,
 645                                       &logical_start,
 646                                       clusters_to_add,
 647                                       mark_unwritten,
 648                                       bh,
 649                                       handle,
 650                                       data_ac,
 651                                       meta_ac,
 652                                       &why);
 653         if ((status < 0) && (status != -EAGAIN)) {
 654                 if (status != -ENOSPC)
 655                         mlog_errno(status);
 656                 goto leave;
 657         }
 658
 659         ocfs2_journal_dirty(handle, bh);
 660
 661         spin_lock(&OCFS2_I(inode)->ip_lock);
 662         clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
 663         spin_unlock(&OCFS2_I(inode)->ip_lock);
 664         /* Release unused quota reservation */
 665         dquot_free_space(inode,
 666                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 667         did_quota = 0;
 668
 669         if (why != RESTART_NONE && clusters_to_add) {
 670                 if (why == RESTART_META) {
 671                         restart_func = 1;
 672                         status = 0;
 673                 } else {
 674                         BUG_ON(why != RESTART_TRANS);
 675
 676                         status = ocfs2_allocate_extend_trans(handle, 1);
 677                         if (status < 0) {
 678                                 /* handle still has to be committed at
 679                                  * this point. */
 680                                 status = -ENOMEM;
 681                                 mlog_errno(status);
 682                                 goto leave;
 683                         }
 684                         goto restarted_transaction;
 685                 }
 686         }
 687
 688         trace_ocfs2_extend_allocation_end(OCFS2_I(inode)->ip_blkno,
 689              le32_to_cpu(fe->i_clusters),
 690              (unsigned long long)le64_to_cpu(fe->i_size),
 691              OCFS2_I(inode)->ip_clusters,
 692              (unsigned long long)i_size_read(inode));
 693
 694 leave:
 695         if (status < 0 && did_quota)
 696                 dquot_free_space(inode,
 697                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 698         if (handle) {
 699                 ocfs2_commit_trans(osb, handle);
 700                 handle = NULL;
 701         }
 702         if (data_ac) {
 703                 ocfs2_free_alloc_context(data_ac);
 704                 data_ac = NULL;
 705         }
 706         if (meta_ac) {
 707                 ocfs2_free_alloc_context(meta_ac);
 708                 meta_ac = NULL;
 709         }
 710         if ((!status) && restart_func) {
 711                 restart_func = 0;
 712                 goto restart_all;
 713         }
 714         brelse(bh);
 715         bh = NULL;
 716
 717         return status;
 718 }
 719
 720 /*
 721  * While a write will already be ordering the data, a truncate will not.
 722  * Thus, we need to explicitly order the zeroed pages.
 723  */
 724 static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode)
 725 {
 726         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 727         handle_t *handle = NULL;
 728         int ret = 0;
 729
 730         if (!ocfs2_should_order_data(inode))
 731                 goto out;
 732
 733         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 734         if (IS_ERR(handle)) {
 735                 ret = -ENOMEM;
 736                 mlog_errno(ret);
 737                 goto out;
 738         }
 739
 740         ret = ocfs2_jbd2_file_inode(handle, inode);
 741         if (ret < 0)
 742                 mlog_errno(ret);
 743
 744 out:
 745         if (ret) {
 746                 if (!IS_ERR(handle))
 747                         ocfs2_commit_trans(osb, handle);
 748                 handle = ERR_PTR(ret);
 749         }
 750         return handle;
 751 }
 752
 753 /* Some parts of this taken from generic_cont_expand, which turned out
 754  * to be too fragile to do exactly what we need without us having to
 755  * worry about recursive locking in ->write_begin() and ->write_end(). */
 756 static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
 757                                  u64 abs_to)
 758 {
 759         struct address_space *mapping = inode->i_mapping;
 760         struct page *page;
 761         unsigned long index = abs_from >> PAGE_CACHE_SHIFT;
 762         handle_t *handle = NULL;
 763         int ret = 0;
 764         unsigned zero_from, zero_to, block_start, block_end;
 765
 766         BUG_ON(abs_from >= abs_to);
 767         BUG_ON(abs_to > (((u64)index + 1) << PAGE_CACHE_SHIFT));
 768         BUG_ON(abs_from & (inode->i_blkbits - 1));
 769
 770         page = find_or_create_page(mapping, index, GFP_NOFS);
 771         if (!page) {
 772                 ret = -ENOMEM;
 773                 mlog_errno(ret);
 774                 goto out;
 775         }
 776
 777         /* Get the offsets within the page that we want to zero */
 778         zero_from = abs_from & (PAGE_CACHE_SIZE - 1);
 779         zero_to = abs_to & (PAGE_CACHE_SIZE - 1);
 780         if (!zero_to)
 781                 zero_to = PAGE_CACHE_SIZE;
 782
 783         trace_ocfs2_write_zero_page(
 784                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 785                         (unsigned long long)abs_from,
 786                         (unsigned long long)abs_to,
 787                         index, zero_from, zero_to);
 788
 789         /* We know that zero_from is block aligned */
 790         for (block_start = zero_from; block_start < zero_to;
 791              block_start = block_end) {
 792                 block_end = block_start + (1 << inode->i_blkbits);
 793
 794                 /*
 795                  * block_start is block-aligned.  Bump it by one to force
 796                  * __block_write_begin and block_commit_write to zero the
 797                  * whole block.
 798                  */
 799                 ret = __block_write_begin(page, block_start + 1, 0,
 800                                           ocfs2_get_block);
 801                 if (ret < 0) {
 802                         mlog_errno(ret);
 803                         goto out_unlock;
 804                 }
 805
 806                 if (!handle) {
 807                         handle = ocfs2_zero_start_ordered_transaction(inode);
 808                         if (IS_ERR(handle)) {
 809                                 ret = PTR_ERR(handle);
 810                                 handle = NULL;
 811                                 break;
 812                         }
 813                 }
 814
 815                 /* must not update i_size! */
 816                 ret = block_commit_write(page, block_start + 1,
 817                                          block_start + 1);
 818                 if (ret < 0)
 819                         mlog_errno(ret);
 820                 else
 821                         ret = 0;
 822         }
 823
 824         if (handle)
 825                 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 826
 827 out_unlock:
 828         unlock_page(page);
 829         page_cache_release(page);
 830 out:
 831         return ret;
 832 }
 833
 834 /*
 835  * Find the next range to zero.  We do this in terms of bytes because
 836  * that's what ocfs2_zero_extend() wants, and it is dealing with the
 837  * pagecache.  We may return multiple extents.
 838  *
 839  * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
 840  * needs to be zeroed.  range_start and range_end return the next zeroing
 841  * range.  A subsequent call should pass the previous range_end as its
 842  * zero_start.  If range_end is 0, there's nothing to do.
 843  *
 844  * Unwritten extents are skipped over.  Refcounted extents are CoWd.
 845  */
 846 static int ocfs2_zero_extend_get_range(struct inode *inode,
 847                                        struct buffer_head *di_bh,
 848                                        u64 zero_start, u64 zero_end,
 849                                        u64 *range_start, u64 *range_end)
 850 {
 851         int rc = 0, needs_cow = 0;
 852         u32 p_cpos, zero_clusters = 0;
 853         u32 zero_cpos =
 854                 zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 855         u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
 856         unsigned int num_clusters = 0;
 857         unsigned int ext_flags = 0;
 858
 859         while (zero_cpos < last_cpos) {
 860                 rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
 861                                         &num_clusters, &ext_flags);
 862                 if (rc) {
 863                         mlog_errno(rc);
 864                         goto out;
 865                 }
 866
 867                 if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
 868                         zero_clusters = num_clusters;
 869                         if (ext_flags & OCFS2_EXT_REFCOUNTED)
 870                                 needs_cow = 1;
 871                         break;
 872                 }
 873
 874                 zero_cpos += num_clusters;
 875         }
 876         if (!zero_clusters) {
 877                 *range_end = 0;
 878                 goto out;
 879         }
 880
 881         while ((zero_cpos + zero_clusters) < last_cpos) {
 882                 rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
 883                                         &p_cpos, &num_clusters,
 884                                         &ext_flags);
 885                 if (rc) {
 886                         mlog_errno(rc);
 887                         goto out;
 888                 }
 889
 890                 if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
 891                         break;
 892                 if (ext_flags & OCFS2_EXT_REFCOUNTED)
 893                         needs_cow = 1;
 894                 zero_clusters += num_clusters;
 895         }
 896         if ((zero_cpos + zero_clusters) > last_cpos)
 897                 zero_clusters = last_cpos - zero_cpos;
 898
 899         if (needs_cow) {
 900                 rc = ocfs2_refcount_cow(inode, di_bh, zero_cpos,
 901                                         zero_clusters, UINT_MAX);
 902                 if (rc) {
 903                         mlog_errno(rc);
 904                         goto out;
 905                 }
 906         }
 907
 908         *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
 909         *range_end = ocfs2_clusters_to_bytes(inode->i_sb,
 910                                              zero_cpos + zero_clusters);
 911
 912 out:
 913         return rc;
 914 }
 915
 916 /*
 917  * Zero one range returned from ocfs2_zero_extend_get_range().  The caller
 918  * has made sure that the entire range needs zeroing.
 919  */
 920 static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
 921                                    u64 range_end)
 922 {
 923         int rc = 0;
 924         u64 next_pos;
 925         u64 zero_pos = range_start;
 926
 927         trace_ocfs2_zero_extend_range(
 928                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 929                         (unsigned long long)range_start,
 930                         (unsigned long long)range_end);
 931         BUG_ON(range_start >= range_end);
 932
 933         while (zero_pos < range_end) {
 934                 next_pos = (zero_pos & PAGE_CACHE_MASK) + PAGE_CACHE_SIZE;
 935                 if (next_pos > range_end)
 936                         next_pos = range_end;
 937                 rc = ocfs2_write_zero_page(inode, zero_pos, next_pos);
 938                 if (rc < 0) {
 939                         mlog_errno(rc);
 940                         break;
 941                 }
 942                 zero_pos = next_pos;
 943
 944                 /*
 945                  * Very large extends have the potential to lock up
 946                  * the cpu for extended periods of time.
 947                  */
 948                 cond_resched();
 949         }
 950
 951         return rc;
 952 }
 953
 954 int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
 955                       loff_t zero_to_size)
 956 {
 957         int ret = 0;
 958         u64 zero_start, range_start = 0, range_end = 0;
 959         struct super_block *sb = inode->i_sb;
 960
 961         zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
 962         trace_ocfs2_zero_extend((unsigned long long)OCFS2_I(inode)->ip_blkno,
 963                                 (unsigned long long)zero_start,
 964                                 (unsigned long long)i_size_read(inode));
 965         while (zero_start < zero_to_size) {
 966                 ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
 967                                                   zero_to_size,
 968                                                   &range_start,
 969                                                   &range_end);
 970                 if (ret) {
 971                         mlog_errno(ret);
 972                         break;
 973                 }
 974                 if (!range_end)
 975                         break;
 976                 /* Trim the ends */
 977                 if (range_start < zero_start)
 978                         range_start = zero_start;
 979                 if (range_end > zero_to_size)
 980                         range_end = zero_to_size;
 981
 982                 ret = ocfs2_zero_extend_range(inode, range_start,
 983                                               range_end);
 984                 if (ret) {
 985                         mlog_errno(ret);
 986                         break;
 987                 }
 988                 zero_start = range_end;
 989         }
 990
 991         return ret;
 992 }
 993
 994 int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
 995                           u64 new_i_size, u64 zero_to)
 996 {
 997         int ret;
 998         u32 clusters_to_add;
 999         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1000
1001         /*
1002          * Only quota files call this without a bh, and they can't be
1003          * refcounted.
1004          */
1005         BUG_ON(!di_bh && (oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
1006         BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
1007
1008         clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
1009         if (clusters_to_add < oi->ip_clusters)
1010                 clusters_to_add = 0;
1011         else
1012                 clusters_to_add -= oi->ip_clusters;
1013
1014         if (clusters_to_add) {
1015                 ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
1016                                                 clusters_to_add, 0);
1017                 if (ret) {
1018                         mlog_errno(ret);
1019                         goto out;
1020                 }
1021         }
1022
1023         /*
1024          * Call this even if we don't add any clusters to the tree. We
1025          * still need to zero the area between the old i_size and the
1026          * new i_size.
1027          */
1028         ret = ocfs2_zero_extend(inode, di_bh, zero_to);
1029         if (ret < 0)
1030                 mlog_errno(ret);
1031
1032 out:
1033         return ret;
1034 }
1035
1036 static int ocfs2_extend_file(struct inode *inode,
1037                              struct buffer_head *di_bh,
1038                              u64 new_i_size)
1039 {
1040         int ret = 0;
1041         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1042
1043         BUG_ON(!di_bh);
1044
1045         /* setattr sometimes calls us like this. */
1046         if (new_i_size == 0)
1047                 goto out;
1048
1049         if (i_size_read(inode) == new_i_size)
1050                 goto out;
1051         BUG_ON(new_i_size < i_size_read(inode));
1052
1053         /*
1054          * The alloc sem blocks people in read/write from reading our
1055          * allocation until we're done changing it. We depend on
1056          * i_mutex to block other extend/truncate calls while we're
1057          * here.  We even have to hold it for sparse files because there
1058          * might be some tail zeroing.
1059          */
1060         down_write(&oi->ip_alloc_sem);
1061
1062         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1063                 /*
1064                  * We can optimize small extends by keeping the inodes
1065                  * inline data.
1066                  */
1067                 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1068                         up_write(&oi->ip_alloc_sem);
1069                         goto out_update_size;
1070                 }
1071
1072                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1073                 if (ret) {
1074                         up_write(&oi->ip_alloc_sem);
1075                         mlog_errno(ret);
1076                         goto out;
1077                 }
1078         }
1079
1080         if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1081                 ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1082         else
1083                 ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1084                                             new_i_size);
1085
1086         up_write(&oi->ip_alloc_sem);
1087
1088         if (ret < 0) {
1089                 mlog_errno(ret);
1090                 goto out;
1091         }
1092
1093 out_update_size:
1094         ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1095         if (ret < 0)
1096                 mlog_errno(ret);
1097
1098 out:
1099         return ret;
1100 }
1101
1102 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1103 {
1104         int status = 0, size_change;
1105         struct inode *inode = dentry->d_inode;
1106         struct super_block *sb = inode->i_sb;
1107         struct ocfs2_super *osb = OCFS2_SB(sb);
1108         struct buffer_head *bh = NULL;
1109         handle_t *handle = NULL;
1110         struct dquot *transfer_to[MAXQUOTAS] = { };
1111         int qtype;
1112
1113         trace_ocfs2_setattr(inode, dentry,
1114                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
1115                             dentry->d_name.len, dentry->d_name.name,
1116                             attr->ia_valid, attr->ia_mode,
1117                             from_kuid(&init_user_ns, attr->ia_uid),
1118                             from_kgid(&init_user_ns, attr->ia_gid));
1119
1120         /* ensuring we don't even attempt to truncate a symlink */
1121         if (S_ISLNK(inode->i_mode))
1122                 attr->ia_valid &= ~ATTR_SIZE;
1123
1124 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1125                            | ATTR_GID | ATTR_UID | ATTR_MODE)
1126         if (!(attr->ia_valid & OCFS2_VALID_ATTRS))
1127                 return 0;
1128
1129         status = inode_change_ok(inode, attr);
1130         if (status)
1131                 return status;
1132
1133         if (is_quota_modification(inode, attr))
1134                 dquot_initialize(inode);
1135         size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1136         if (size_change) {
1137                 status = ocfs2_rw_lock(inode, 1);
1138                 if (status < 0) {
1139                         mlog_errno(status);
1140                         goto bail;
1141                 }
1142         }
1143
1144         status = ocfs2_inode_lock(inode, &bh, 1);
1145         if (status < 0) {
1146                 if (status != -ENOENT)
1147                         mlog_errno(status);
1148                 goto bail_unlock_rw;
1149         }
1150
1151         if (size_change && attr->ia_size != i_size_read(inode)) {
1152                 status = inode_newsize_ok(inode, attr->ia_size);
1153                 if (status)
1154                         goto bail_unlock;
1155
1156                 inode_dio_wait(inode);
1157
1158                 if (i_size_read(inode) > attr->ia_size) {
1159                         if (ocfs2_should_order_data(inode)) {
1160                                 status = ocfs2_begin_ordered_truncate(inode,
1161                                                                       attr->ia_size);
1162                                 if (status)
1163                                         goto bail_unlock;
1164                         }
1165                         status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1166                 } else
1167                         status = ocfs2_extend_file(inode, bh, attr->ia_size);
1168                 if (status < 0) {
1169                         if (status != -ENOSPC)
1170                                 mlog_errno(status);
1171                         status = -ENOSPC;
1172                         goto bail_unlock;
1173                 }
1174         }
1175
1176         if ((attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
1177             (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
1178                 /*
1179                  * Gather pointers to quota structures so that allocation /
1180                  * freeing of quota structures happens here and not inside
1181                  * dquot_transfer() where we have problems with lock ordering
1182                  */
1183                 if (attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)
1184                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1185                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1186                         transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(attr->ia_uid));
1187                         if (!transfer_to[USRQUOTA]) {
1188                                 status = -ESRCH;
1189                                 goto bail_unlock;
1190                         }
1191                 }
1192                 if (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid)
1193                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1194                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1195                         transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(attr->ia_gid));
1196                         if (!transfer_to[GRPQUOTA]) {
1197                                 status = -ESRCH;
1198                                 goto bail_unlock;
1199                         }
1200                 }
1201                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1202                                            2 * ocfs2_quota_trans_credits(sb));
1203                 if (IS_ERR(handle)) {
1204                         status = PTR_ERR(handle);
1205                         mlog_errno(status);
1206                         goto bail_unlock;
1207                 }
1208                 status = __dquot_transfer(inode, transfer_to);
1209                 if (status < 0)
1210                         goto bail_commit;
1211         } else {
1212                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1213                 if (IS_ERR(handle)) {
1214                         status = PTR_ERR(handle);
1215                         mlog_errno(status);
1216                         goto bail_unlock;
1217                 }
1218         }
1219
1220         setattr_copy(inode, attr);
1221         mark_inode_dirty(inode);
1222
1223         status = ocfs2_mark_inode_dirty(handle, inode, bh);
1224         if (status < 0)
1225                 mlog_errno(status);
1226
1227 bail_commit:
1228         ocfs2_commit_trans(osb, handle);
1229 bail_unlock:
1230         ocfs2_inode_unlock(inode, 1);
1231 bail_unlock_rw:
1232         if (size_change)
1233                 ocfs2_rw_unlock(inode, 1);
1234 bail:
1235         brelse(bh);
1236
1237         /* Release quota pointers in case we acquired them */
1238         for (qtype = 0; qtype < MAXQUOTAS; qtype++)
1239                 dqput(transfer_to[qtype]);
1240
1241         if (!status && attr->ia_valid & ATTR_MODE) {
1242                 status = posix_acl_chmod(inode, inode->i_mode);
1243                 if (status < 0)
1244                         mlog_errno(status);
1245         }
1246
1247         return status;
1248 }
1249
1250 int ocfs2_getattr(struct vfsmount *mnt,
1251                   struct dentry *dentry,
1252                   struct kstat *stat)
1253 {
1254         struct inode *inode = dentry->d_inode;
1255         struct super_block *sb = dentry->d_inode->i_sb;
1256         struct ocfs2_super *osb = sb->s_fs_info;
1257         int err;
1258
1259         err = ocfs2_inode_revalidate(dentry);
1260         if (err) {
1261                 if (err != -ENOENT)
1262                         mlog_errno(err);
1263                 goto bail;
1264         }
1265
1266         generic_fillattr(inode, stat);
1267
1268         /* We set the blksize from the cluster size for performance */
1269         stat->blksize = osb->s_clustersize;
1270
1271 bail:
1272         return err;
1273 }
1274
1275 int ocfs2_permission(struct inode *inode, int mask)
1276 {
1277         int ret;
1278
1279         if (mask & MAY_NOT_BLOCK)
1280                 return -ECHILD;
1281
1282         ret = ocfs2_inode_lock(inode, NULL, 0);
1283         if (ret) {
1284                 if (ret != -ENOENT)
1285                         mlog_errno(ret);
1286                 goto out;
1287         }
1288
1289         ret = generic_permission(inode, mask);
1290
1291         ocfs2_inode_unlock(inode, 0);
1292 out:
1293         return ret;
1294 }
1295
1296 static int __ocfs2_write_remove_suid(struct inode *inode,
1297                                      struct buffer_head *bh)
1298 {
1299         int ret;
1300         handle_t *handle;
1301         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1302         struct ocfs2_dinode *di;
1303
1304         trace_ocfs2_write_remove_suid(
1305                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1306                         inode->i_mode);
1307
1308         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1309         if (IS_ERR(handle)) {
1310                 ret = PTR_ERR(handle);
1311                 mlog_errno(ret);
1312                 goto out;
1313         }
1314
1315         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1316                                       OCFS2_JOURNAL_ACCESS_WRITE);
1317         if (ret < 0) {
1318                 mlog_errno(ret);
1319                 goto out_trans;
1320         }
1321
1322         inode->i_mode &= ~S_ISUID;
1323         if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1324                 inode->i_mode &= ~S_ISGID;
1325
1326         di = (struct ocfs2_dinode *) bh->b_data;
1327         di->i_mode = cpu_to_le16(inode->i_mode);
1328
1329         ocfs2_journal_dirty(handle, bh);
1330
1331 out_trans:
1332         ocfs2_commit_trans(osb, handle);
1333 out:
1334         return ret;
1335 }
1336
1337 /*
1338  * Will look for holes and unwritten extents in the range starting at
1339  * pos for count bytes (inclusive).
1340  */
1341 static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1342                                        size_t count)
1343 {
1344         int ret = 0;
1345         unsigned int extent_flags;
1346         u32 cpos, clusters, extent_len, phys_cpos;
1347         struct super_block *sb = inode->i_sb;
1348
1349         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1350         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1351
1352         while (clusters) {
1353                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1354                                          &extent_flags);
1355                 if (ret < 0) {
1356                         mlog_errno(ret);
1357                         goto out;
1358                 }
1359
1360                 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1361                         ret = 1;
1362                         break;
1363                 }
1364
1365                 if (extent_len > clusters)
1366                         extent_len = clusters;
1367
1368                 clusters -= extent_len;
1369                 cpos += extent_len;
1370         }
1371 out:
1372         return ret;
1373 }
1374
1375 static int ocfs2_write_remove_suid(struct inode *inode)
1376 {
1377         int ret;
1378         struct buffer_head *bh = NULL;
1379
1380         ret = ocfs2_read_inode_block(inode, &bh);
1381         if (ret < 0) {
1382                 mlog_errno(ret);
1383                 goto out;
1384         }
1385
1386         ret =  __ocfs2_write_remove_suid(inode, bh);
1387 out:
1388         brelse(bh);
1389         return ret;
1390 }
1391
1392 /*
1393  * Allocate enough extents to cover the region starting at byte offset
1394  * start for len bytes. Existing extents are skipped, any extents
1395  * added are marked as "unwritten".
1396  */
1397 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1398                                             u64 start, u64 len)
1399 {
1400         int ret;
1401         u32 cpos, phys_cpos, clusters, alloc_size;
1402         u64 end = start + len;
1403         struct buffer_head *di_bh = NULL;
1404
1405         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1406                 ret = ocfs2_read_inode_block(inode, &di_bh);
1407                 if (ret) {
1408                         mlog_errno(ret);
1409                         goto out;
1410                 }
1411
1412                 /*
1413                  * Nothing to do if the requested reservation range
1414                  * fits within the inode.
1415                  */
1416                 if (ocfs2_size_fits_inline_data(di_bh, end))
1417                         goto out;
1418
1419                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1420                 if (ret) {
1421                         mlog_errno(ret);
1422                         goto out;
1423                 }
1424         }
1425
1426         /*
1427          * We consider both start and len to be inclusive.
1428          */
1429         cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1430         clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1431         clusters -= cpos;
1432
1433         while (clusters) {
1434                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1435                                          &alloc_size, NULL);
1436                 if (ret) {
1437                         mlog_errno(ret);
1438                         goto out;
1439                 }
1440
1441                 /*
1442                  * Hole or existing extent len can be arbitrary, so
1443                  * cap it to our own allocation request.
1444                  */
1445                 if (alloc_size > clusters)
1446                         alloc_size = clusters;
1447
1448                 if (phys_cpos) {
1449                         /*
1450                          * We already have an allocation at this
1451                          * region so we can safely skip it.
1452                          */
1453                         goto next;
1454                 }
1455
1456                 ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1457                 if (ret) {
1458                         if (ret != -ENOSPC)
1459                                 mlog_errno(ret);
1460                         goto out;
1461                 }
1462
1463 next:
1464                 cpos += alloc_size;
1465                 clusters -= alloc_size;
1466         }
1467
1468         ret = 0;
1469 out:
1470
1471         brelse(di_bh);
1472         return ret;
1473 }
1474
1475 /*
1476  * Truncate a byte range, avoiding pages within partial clusters. This
1477  * preserves those pages for the zeroing code to write to.
1478  */
1479 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1480                                          u64 byte_len)
1481 {
1482         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1483         loff_t start, end;
1484         struct address_space *mapping = inode->i_mapping;
1485
1486         start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1487         end = byte_start + byte_len;
1488         end = end & ~(osb->s_clustersize - 1);
1489
1490         if (start < end) {
1491                 unmap_mapping_range(mapping, start, end - start, 0);
1492                 truncate_inode_pages_range(mapping, start, end - 1);
1493         }
1494 }
1495
1496 static int ocfs2_zero_partial_clusters(struct inode *inode,
1497                                        u64 start, u64 len)
1498 {
1499         int ret = 0;
1500         u64 tmpend, end = start + len;
1501         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1502         unsigned int csize = osb->s_clustersize;
1503         handle_t *handle;
1504
1505         /*
1506          * The "start" and "end" values are NOT necessarily part of
1507          * the range whose allocation is being deleted. Rather, this
1508          * is what the user passed in with the request. We must zero
1509          * partial clusters here. There's no need to worry about
1510          * physical allocation - the zeroing code knows to skip holes.
1511          */
1512         trace_ocfs2_zero_partial_clusters(
1513                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1514                 (unsigned long long)start, (unsigned long long)end);
1515
1516         /*
1517          * If both edges are on a cluster boundary then there's no
1518          * zeroing required as the region is part of the allocation to
1519          * be truncated.
1520          */
1521         if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1522                 goto out;
1523
1524         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1525         if (IS_ERR(handle)) {
1526                 ret = PTR_ERR(handle);
1527                 mlog_errno(ret);
1528                 goto out;
1529         }
1530
1531         /*
1532          * We want to get the byte offset of the end of the 1st cluster.
1533          */
1534         tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1535         if (tmpend > end)
1536                 tmpend = end;
1537
1538         trace_ocfs2_zero_partial_clusters_range1((unsigned long long)start,
1539                                                  (unsigned long long)tmpend);
1540
1541         ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1542         if (ret)
1543                 mlog_errno(ret);
1544
1545         if (tmpend < end) {
1546                 /*
1547                  * This may make start and end equal, but the zeroing
1548                  * code will skip any work in that case so there's no
1549                  * need to catch it up here.
1550                  */
1551                 start = end & ~(osb->s_clustersize - 1);
1552
1553                 trace_ocfs2_zero_partial_clusters_range2(
1554                         (unsigned long long)start, (unsigned long long)end);
1555
1556                 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1557                 if (ret)
1558                         mlog_errno(ret);
1559         }
1560
1561         ocfs2_commit_trans(osb, handle);
1562 out:
1563         return ret;
1564 }
1565
1566 static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1567 {
1568         int i;
1569         struct ocfs2_extent_rec *rec = NULL;
1570
1571         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1572
1573                 rec = &el->l_recs[i];
1574
1575                 if (le32_to_cpu(rec->e_cpos) < pos)
1576                         break;
1577         }
1578
1579         return i;
1580 }
1581
1582 /*
1583  * Helper to calculate the punching pos and length in one run, we handle the
1584  * following three cases in order:
1585  *
1586  * - remove the entire record
1587  * - remove a partial record
1588  * - no record needs to be removed (hole-punching completed)
1589 */
1590 static void ocfs2_calc_trunc_pos(struct inode *inode,
1591                                  struct ocfs2_extent_list *el,
1592                                  struct ocfs2_extent_rec *rec,
1593                                  u32 trunc_start, u32 *trunc_cpos,
1594                                  u32 *trunc_len, u32 *trunc_end,
1595                                  u64 *blkno, int *done)
1596 {
1597         int ret = 0;
1598         u32 coff, range;
1599
1600         range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1601
1602         if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1603                 /*
1604                  * remove an entire extent record.
1605                  */
1606                 *trunc_cpos = le32_to_cpu(rec->e_cpos);
1607                 /*
1608                  * Skip holes if any.
1609                  */
1610                 if (range < *trunc_end)
1611                         *trunc_end = range;
1612                 *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1613                 *blkno = le64_to_cpu(rec->e_blkno);
1614                 *trunc_end = le32_to_cpu(rec->e_cpos);
1615         } else if (range > trunc_start) {
1616                 /*
1617                  * remove a partial extent record, which means we're
1618                  * removing the last extent record.
1619                  */
1620                 *trunc_cpos = trunc_start;
1621                 /*
1622                  * skip hole if any.
1623                  */
1624                 if (range < *trunc_end)
1625                         *trunc_end = range;
1626                 *trunc_len = *trunc_end - trunc_start;
1627                 coff = trunc_start - le32_to_cpu(rec->e_cpos);
1628                 *blkno = le64_to_cpu(rec->e_blkno) +
1629                                 ocfs2_clusters_to_blocks(inode->i_sb, coff);
1630                 *trunc_end = trunc_start;
1631         } else {
1632                 /*
1633                  * It may have two following possibilities:
1634                  *
1635                  * - last record has been removed
1636                  * - trunc_start was within a hole
1637                  *
1638                  * both two cases mean the completion of hole punching.
1639                  */
1640                 ret = 1;
1641         }
1642
1643         *done = ret;
1644 }
1645
1646 static int ocfs2_remove_inode_range(struct inode *inode,
1647                                     struct buffer_head *di_bh, u64 byte_start,
1648                                     u64 byte_len)
1649 {
1650         int ret = 0, flags = 0, done = 0, i;
1651         u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1652         u32 cluster_in_el;
1653         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1654         struct ocfs2_cached_dealloc_ctxt dealloc;
1655         struct address_space *mapping = inode->i_mapping;
1656         struct ocfs2_extent_tree et;
1657         struct ocfs2_path *path = NULL;
1658         struct ocfs2_extent_list *el = NULL;
1659         struct ocfs2_extent_rec *rec = NULL;
1660         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1661         u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1662
1663         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1664         ocfs2_init_dealloc_ctxt(&dealloc);
1665
1666         trace_ocfs2_remove_inode_range(
1667                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1668                         (unsigned long long)byte_start,
1669                         (unsigned long long)byte_len);
1670
1671         if (byte_len == 0)
1672                 return 0;
1673
1674         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1675                 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1676                                             byte_start + byte_len, 0);
1677                 if (ret) {
1678                         mlog_errno(ret);
1679                         goto out;
1680                 }
1681                 /*
1682                  * There's no need to get fancy with the page cache
1683                  * truncate of an inline-data inode. We're talking
1684                  * about less than a page here, which will be cached
1685                  * in the dinode buffer anyway.
1686                  */
1687                 unmap_mapping_range(mapping, 0, 0, 0);
1688                 truncate_inode_pages(mapping, 0);
1689                 goto out;
1690         }
1691
1692         /*
1693          * For reflinks, we may need to CoW 2 clusters which might be
1694          * partially zero'd later, if hole's start and end offset were
1695          * within one cluster(means is not exactly aligned to clustersize).
1696          */
1697
1698         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
1699
1700                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1701                 if (ret) {
1702                         mlog_errno(ret);
1703                         goto out;
1704                 }
1705
1706                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1707                 if (ret) {
1708                         mlog_errno(ret);
1709                         goto out;
1710                 }
1711         }
1712
1713         trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1714         trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1715         cluster_in_el = trunc_end;
1716
1717         ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1718         if (ret) {
1719                 mlog_errno(ret);
1720                 goto out;
1721         }
1722
1723         path = ocfs2_new_path_from_et(&et);
1724         if (!path) {
1725                 ret = -ENOMEM;
1726                 mlog_errno(ret);
1727                 goto out;
1728         }
1729
1730         while (trunc_end > trunc_start) {
1731
1732                 ret = ocfs2_find_path(INODE_CACHE(inode), path,
1733                                       cluster_in_el);
1734                 if (ret) {
1735                         mlog_errno(ret);
1736                         goto out;
1737                 }
1738
1739                 el = path_leaf_el(path);
1740
1741                 i = ocfs2_find_rec(el, trunc_end);
1742                 /*
1743                  * Need to go to previous extent block.
1744                  */
1745                 if (i < 0) {
1746                         if (path->p_tree_depth == 0)
1747                                 break;
1748
1749                         ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1750                                                             path,
1751                                                             &cluster_in_el);
1752                         if (ret) {
1753                                 mlog_errno(ret);
1754                                 goto out;
1755                         }
1756
1757                         /*
1758                          * We've reached the leftmost extent block,
1759                          * it's safe to leave.
1760                          */
1761                         if (cluster_in_el == 0)
1762                                 break;
1763
1764                         /*
1765                          * The 'pos' searched for previous extent block is
1766                          * always one cluster less than actual trunc_end.
1767                          */
1768                         trunc_end = cluster_in_el + 1;
1769
1770                         ocfs2_reinit_path(path, 1);
1771
1772                         continue;
1773
1774                 } else
1775                         rec = &el->l_recs[i];
1776
1777                 ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1778                                      &trunc_len, &trunc_end, &blkno, &done);
1779                 if (done)
1780                         break;
1781
1782                 flags = rec->e_flags;
1783                 phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1784
1785                 ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1786                                                phys_cpos, trunc_len, flags,
1787                                                &dealloc, refcount_loc);
1788                 if (ret < 0) {
1789                         mlog_errno(ret);
1790                         goto out;
1791                 }
1792
1793                 cluster_in_el = trunc_end;
1794
1795                 ocfs2_reinit_path(path, 1);
1796         }
1797
1798         ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1799
1800 out:
1801         ocfs2_free_path(path);
1802         ocfs2_schedule_truncate_log_flush(osb, 1);
1803         ocfs2_run_deallocs(osb, &dealloc);
1804
1805         return ret;
1806 }
1807
1808 /*
1809  * Parts of this function taken from xfs_change_file_space()
1810  */
1811 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1812                                      loff_t f_pos, unsigned int cmd,
1813                                      struct ocfs2_space_resv *sr,
1814                                      int change_size)
1815 {
1816         int ret;
1817         s64 llen;
1818         loff_t size;
1819         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1820         struct buffer_head *di_bh = NULL;
1821         handle_t *handle;
1822         unsigned long long max_off = inode->i_sb->s_maxbytes;
1823
1824         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1825                 return -EROFS;
1826
1827         mutex_lock(&inode->i_mutex);
1828
1829         /*
1830          * This prevents concurrent writes on other nodes
1831          */
1832         ret = ocfs2_rw_lock(inode, 1);
1833         if (ret) {
1834                 mlog_errno(ret);
1835                 goto out;
1836         }
1837
1838         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1839         if (ret) {
1840                 mlog_errno(ret);
1841                 goto out_rw_unlock;
1842         }
1843
1844         if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1845                 ret = -EPERM;
1846                 goto out_inode_unlock;
1847         }
1848
1849         switch (sr->l_whence) {
1850         case 0: /*SEEK_SET*/
1851                 break;
1852         case 1: /*SEEK_CUR*/
1853                 sr->l_start += f_pos;
1854                 break;
1855         case 2: /*SEEK_END*/
1856                 sr->l_start += i_size_read(inode);
1857                 break;
1858         default:
1859                 ret = -EINVAL;
1860                 goto out_inode_unlock;
1861         }
1862         sr->l_whence = 0;
1863
1864         llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1865
1866         if (sr->l_start < 0
1867             || sr->l_start > max_off
1868             || (sr->l_start + llen) < 0
1869             || (sr->l_start + llen) > max_off) {
1870                 ret = -EINVAL;
1871                 goto out_inode_unlock;
1872         }
1873         size = sr->l_start + sr->l_len;
1874
1875         if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64 ||
1876             cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) {
1877                 if (sr->l_len <= 0) {
1878                         ret = -EINVAL;
1879                         goto out_inode_unlock;
1880                 }
1881         }
1882
1883         if (file && should_remove_suid(file->f_path.dentry)) {
1884                 ret = __ocfs2_write_remove_suid(inode, di_bh);
1885                 if (ret) {
1886                         mlog_errno(ret);
1887                         goto out_inode_unlock;
1888                 }
1889         }
1890
1891         down_write(&OCFS2_I(inode)->ip_alloc_sem);
1892         switch (cmd) {
1893         case OCFS2_IOC_RESVSP:
1894         case OCFS2_IOC_RESVSP64:
1895                 /*
1896                  * This takes unsigned offsets, but the signed ones we
1897                  * pass have been checked against overflow above.
1898                  */
1899                 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1900                                                        sr->l_len);
1901                 break;
1902         case OCFS2_IOC_UNRESVSP:
1903         case OCFS2_IOC_UNRESVSP64:
1904                 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1905                                                sr->l_len);
1906                 break;
1907         default:
1908                 ret = -EINVAL;
1909         }
1910         up_write(&OCFS2_I(inode)->ip_alloc_sem);
1911         if (ret) {
1912                 mlog_errno(ret);
1913                 goto out_inode_unlock;
1914         }
1915
1916         /*
1917          * We update c/mtime for these changes
1918          */
1919         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1920         if (IS_ERR(handle)) {
1921                 ret = PTR_ERR(handle);
1922                 mlog_errno(ret);
1923                 goto out_inode_unlock;
1924         }
1925
1926         if (change_size && i_size_read(inode) < size)
1927                 i_size_write(inode, size);
1928
1929         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1930         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1931         if (ret < 0)
1932                 mlog_errno(ret);
1933
1934         if (file && (file->f_flags & O_SYNC))
1935                 handle->h_sync = 1;
1936
1937         ocfs2_commit_trans(osb, handle);
1938
1939 out_inode_unlock:
1940         brelse(di_bh);
1941         ocfs2_inode_unlock(inode, 1);
1942 out_rw_unlock:
1943         ocfs2_rw_unlock(inode, 1);
1944
1945 out:
1946         mutex_unlock(&inode->i_mutex);
1947         return ret;
1948 }
1949
1950 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1951                             struct ocfs2_space_resv *sr)
1952 {
1953         struct inode *inode = file_inode(file);
1954         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1955         int ret;
1956
1957         if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1958             !ocfs2_writes_unwritten_extents(osb))
1959                 return -ENOTTY;
1960         else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1961                  !ocfs2_sparse_alloc(osb))
1962                 return -ENOTTY;
1963
1964         if (!S_ISREG(inode->i_mode))
1965                 return -EINVAL;
1966
1967         if (!(file->f_mode & FMODE_WRITE))
1968                 return -EBADF;
1969
1970         ret = mnt_want_write_file(file);
1971         if (ret)
1972                 return ret;
1973         ret = __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1974         mnt_drop_write_file(file);
1975         return ret;
1976 }
1977
1978 static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
1979                             loff_t len)
1980 {
1981         struct inode *inode = file_inode(file);
1982         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1983         struct ocfs2_space_resv sr;
1984         int change_size = 1;
1985         int cmd = OCFS2_IOC_RESVSP64;
1986
1987         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1988                 return -EOPNOTSUPP;
1989         if (!ocfs2_writes_unwritten_extents(osb))
1990                 return -EOPNOTSUPP;
1991
1992         if (mode & FALLOC_FL_KEEP_SIZE)
1993                 change_size = 0;
1994
1995         if (mode & FALLOC_FL_PUNCH_HOLE)
1996                 cmd = OCFS2_IOC_UNRESVSP64;
1997
1998         sr.l_whence = 0;
1999         sr.l_start = (s64)offset;
2000         sr.l_len = (s64)len;
2001
2002         return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
2003                                          change_size);
2004 }
2005
2006 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2007                                    size_t count)
2008 {
2009         int ret = 0;
2010         unsigned int extent_flags;
2011         u32 cpos, clusters, extent_len, phys_cpos;
2012         struct super_block *sb = inode->i_sb;
2013
2014         if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2015             !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
2016             OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2017                 return 0;
2018
2019         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2020         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2021
2022         while (clusters) {
2023                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2024                                          &extent_flags);
2025                 if (ret < 0) {
2026                         mlog_errno(ret);
2027                         goto out;
2028                 }
2029
2030                 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2031                         ret = 1;
2032                         break;
2033                 }
2034
2035                 if (extent_len > clusters)
2036                         extent_len = clusters;
2037
2038                 clusters -= extent_len;
2039                 cpos += extent_len;
2040         }
2041 out:
2042         return ret;
2043 }
2044
2045 static void ocfs2_aiodio_wait(struct inode *inode)
2046 {
2047         wait_queue_head_t *wq = ocfs2_ioend_wq(inode);
2048
2049         wait_event(*wq, (atomic_read(&OCFS2_I(inode)->ip_unaligned_aio) == 0));
2050 }
2051
2052 static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
2053 {
2054         int blockmask = inode->i_sb->s_blocksize - 1;
2055         loff_t final_size = pos + count;
2056
2057         if ((pos & blockmask) || (final_size & blockmask))
2058                 return 1;
2059         return 0;
2060 }
2061
2062 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
2063                                             struct file *file,
2064                                             loff_t pos, size_t count,
2065                                             int *meta_level)
2066 {
2067         int ret;
2068         struct buffer_head *di_bh = NULL;
2069         u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2070         u32 clusters =
2071                 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2072
2073         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2074         if (ret) {
2075                 mlog_errno(ret);
2076                 goto out;
2077         }
2078
2079         *meta_level = 1;
2080
2081         ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
2082         if (ret)
2083                 mlog_errno(ret);
2084 out:
2085         brelse(di_bh);
2086         return ret;
2087 }
2088
2089 static int ocfs2_prepare_inode_for_write(struct file *file,
2090                                          loff_t *ppos,
2091                                          size_t count,
2092                                          int appending,
2093                                          int *direct_io,
2094                                          int *has_refcount)
2095 {
2096         int ret = 0, meta_level = 0;
2097         struct dentry *dentry = file->f_path.dentry;
2098         struct inode *inode = dentry->d_inode;
2099         loff_t saved_pos = 0, 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                  * proceed, 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                 else
2141                         saved_pos = *ppos;
2142
2143                 end = saved_pos + count;
2144
2145                 ret = ocfs2_check_range_for_refcount(inode, saved_pos, count);
2146                 if (ret == 1) {
2147                         ocfs2_inode_unlock(inode, meta_level);
2148                         meta_level = -1;
2149
2150                         ret = ocfs2_prepare_inode_for_refcount(inode,
2151                                                                file,
2152                                                                saved_pos,
2153                                                                count,
2154                                                                &meta_level);
2155                         if (has_refcount)
2156                                 *has_refcount = 1;
2157                         if (direct_io)
2158                                 *direct_io = 0;
2159                 }
2160
2161                 if (ret < 0) {
2162                         mlog_errno(ret);
2163                         goto out_unlock;
2164                 }
2165
2166                 /*
2167                  * Skip the O_DIRECT checks if we don't need
2168                  * them.
2169                  */
2170                 if (!direct_io || !(*direct_io))
2171                         break;
2172
2173                 /*
2174                  * There's no sane way to do direct writes to an inode
2175                  * with inline data.
2176                  */
2177                 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2178                         *direct_io = 0;
2179                         break;
2180                 }
2181
2182                 /*
2183                  * Allowing concurrent direct writes means
2184                  * i_size changes wouldn't be synchronized, so
2185                  * one node could wind up truncating another
2186                  * nodes writes.
2187                  */
2188                 if (end > i_size_read(inode)) {
2189                         *direct_io = 0;
2190                         break;
2191                 }
2192
2193                 /*
2194                  * We don't fill holes during direct io, so
2195                  * check for them here. If any are found, the
2196                  * caller will have to retake some cluster
2197                  * locks and initiate the io as buffered.
2198                  */
2199                 ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
2200                 if (ret == 1) {
2201                         *direct_io = 0;
2202                         ret = 0;
2203                 } else if (ret < 0)
2204                         mlog_errno(ret);
2205                 break;
2206         }
2207
2208         if (appending)
2209                 *ppos = saved_pos;
2210
2211 out_unlock:
2212         trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
2213                                             saved_pos, appending, count,
2214                                             direct_io, has_refcount);
2215
2216         if (meta_level >= 0)
2217                 ocfs2_inode_unlock(inode, meta_level);
2218
2219 out:
2220         return ret;
2221 }
2222
2223 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
2224                                     const struct iovec *iov,
2225                                     unsigned long nr_segs,
2226                                     loff_t pos)
2227 {
2228         int ret, direct_io, appending, rw_level, have_alloc_sem  = 0;
2229         int can_do_direct, has_refcount = 0;
2230         ssize_t written = 0;
2231         size_t ocount;          /* original count */
2232         size_t count;           /* after file limit checks */
2233         loff_t old_size, *ppos = &iocb->ki_pos;
2234         u32 old_clusters;
2235         struct file *file = iocb->ki_filp;
2236         struct inode *inode = file_inode(file);
2237         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2238         int full_coherency = !(osb->s_mount_opt &
2239                                OCFS2_MOUNT_COHERENCY_BUFFERED);
2240         int unaligned_dio = 0;
2241
2242         trace_ocfs2_file_aio_write(inode, file, file->f_path.dentry,
2243                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
2244                 file->f_path.dentry->d_name.len,
2245                 file->f_path.dentry->d_name.name,
2246                 (unsigned int)nr_segs);
2247
2248         if (iocb->ki_nbytes == 0)
2249                 return 0;
2250
2251         appending = file->f_flags & O_APPEND ? 1 : 0;
2252         direct_io = file->f_flags & O_DIRECT ? 1 : 0;
2253
2254         mutex_lock(&inode->i_mutex);
2255
2256         ocfs2_iocb_clear_sem_locked(iocb);
2257
2258 relock:
2259         /* to match setattr's i_mutex -> rw_lock ordering */
2260         if (direct_io) {
2261                 have_alloc_sem = 1;
2262                 /* communicate with ocfs2_dio_end_io */
2263                 ocfs2_iocb_set_sem_locked(iocb);
2264         }
2265
2266         /*
2267          * Concurrent O_DIRECT writes are allowed with
2268          * mount_option "coherency=buffered".
2269          */
2270         rw_level = (!direct_io || full_coherency);
2271
2272         ret = ocfs2_rw_lock(inode, rw_level);
2273         if (ret < 0) {
2274                 mlog_errno(ret);
2275                 goto out_sems;
2276         }
2277
2278         /*
2279          * O_DIRECT writes with "coherency=full" need to take EX cluster
2280          * inode_lock to guarantee coherency.
2281          */
2282         if (direct_io && full_coherency) {
2283                 /*
2284                  * We need to take and drop the inode lock to force
2285                  * other nodes to drop their caches.  Buffered I/O
2286                  * already does this in write_begin().
2287                  */
2288                 ret = ocfs2_inode_lock(inode, NULL, 1);
2289                 if (ret < 0) {
2290                         mlog_errno(ret);
2291                         goto out;
2292                 }
2293
2294                 ocfs2_inode_unlock(inode, 1);
2295         }
2296
2297         can_do_direct = direct_io;
2298         ret = ocfs2_prepare_inode_for_write(file, ppos,
2299                                             iocb->ki_nbytes, appending,
2300                                             &can_do_direct, &has_refcount);
2301         if (ret < 0) {
2302                 mlog_errno(ret);
2303                 goto out;
2304         }
2305
2306         if (direct_io && !is_sync_kiocb(iocb))
2307                 unaligned_dio = ocfs2_is_io_unaligned(inode, iocb->ki_nbytes,
2308                                                       *ppos);
2309
2310         /*
2311          * We can't complete the direct I/O as requested, fall back to
2312          * buffered I/O.
2313          */
2314         if (direct_io && !can_do_direct) {
2315                 ocfs2_rw_unlock(inode, rw_level);
2316
2317                 have_alloc_sem = 0;
2318                 rw_level = -1;
2319
2320                 direct_io = 0;
2321                 goto relock;
2322         }
2323
2324         if (unaligned_dio) {
2325                 /*
2326                  * Wait on previous unaligned aio to complete before
2327                  * proceeding.
2328                  */
2329                 ocfs2_aiodio_wait(inode);
2330
2331                 /* Mark the iocb as needing a decrement in ocfs2_dio_end_io */
2332                 atomic_inc(&OCFS2_I(inode)->ip_unaligned_aio);
2333                 ocfs2_iocb_set_unaligned_aio(iocb);
2334         }
2335
2336         /*
2337          * To later detect whether a journal commit for sync writes is
2338          * necessary, we sample i_size, and cluster count here.
2339          */
2340         old_size = i_size_read(inode);
2341         old_clusters = OCFS2_I(inode)->ip_clusters;
2342
2343         /* communicate with ocfs2_dio_end_io */
2344         ocfs2_iocb_set_rw_locked(iocb, rw_level);
2345
2346         ret = generic_segment_checks(iov, &nr_segs, &ocount,
2347                                      VERIFY_READ);
2348         if (ret)
2349                 goto out_dio;
2350
2351         count = ocount;
2352         ret = generic_write_checks(file, ppos, &count,
2353                                    S_ISBLK(inode->i_mode));
2354         if (ret)
2355                 goto out_dio;
2356
2357         if (direct_io) {
2358                 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
2359                                                     ppos, count, ocount);
2360                 if (written < 0) {
2361                         ret = written;
2362                         goto out_dio;
2363                 }
2364         } else {
2365                 current->backing_dev_info = file->f_mapping->backing_dev_info;
2366                 written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos,
2367                                                       ppos, count, 0);
2368                 current->backing_dev_info = NULL;
2369         }
2370
2371 out_dio:
2372         /* buffered aio wouldn't have proper lock coverage today */
2373         BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2374
2375         if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
2376             ((file->f_flags & O_DIRECT) && !direct_io)) {
2377                 ret = filemap_fdatawrite_range(file->f_mapping, pos,
2378                                                pos + count - 1);
2379                 if (ret < 0)
2380                         written = ret;
2381
2382                 if (!ret && ((old_size != i_size_read(inode)) ||
2383                              (old_clusters != OCFS2_I(inode)->ip_clusters) ||
2384                              has_refcount)) {
2385                         ret = jbd2_journal_force_commit(osb->journal->j_journal);
2386                         if (ret < 0)
2387                                 written = ret;
2388                 }
2389
2390                 if (!ret)
2391                         ret = filemap_fdatawait_range(file->f_mapping, pos,
2392                                                       pos + count - 1);
2393         }
2394
2395         /*
2396          * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2397          * function pointer which is called when o_direct io completes so that
2398          * it can unlock our rw lock.
2399          * Unfortunately there are error cases which call end_io and others
2400          * that don't.  so we don't have to unlock the rw_lock if either an
2401          * async dio is going to do it in the future or an end_io after an
2402          * error has already done it.
2403          */
2404         if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2405                 rw_level = -1;
2406                 have_alloc_sem = 0;
2407                 unaligned_dio = 0;
2408         }
2409
2410         if (unaligned_dio) {
2411                 ocfs2_iocb_clear_unaligned_aio(iocb);
2412                 atomic_dec(&OCFS2_I(inode)->ip_unaligned_aio);
2413         }
2414
2415 out:
2416         if (rw_level != -1)
2417                 ocfs2_rw_unlock(inode, rw_level);
2418
2419 out_sems:
2420         if (have_alloc_sem)
2421                 ocfs2_iocb_clear_sem_locked(iocb);
2422
2423         mutex_unlock(&inode->i_mutex);
2424
2425         if (written)
2426                 ret = written;
2427         return ret;
2428 }
2429
2430 static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
2431                                 struct file *out,
2432                                 struct splice_desc *sd)
2433 {
2434         int ret;
2435
2436         ret = ocfs2_prepare_inode_for_write(out, &sd->pos,
2437                                             sd->total_len, 0, NULL, NULL);
2438         if (ret < 0) {
2439                 mlog_errno(ret);
2440                 return ret;
2441         }
2442
2443         return splice_from_pipe_feed(pipe, sd, pipe_to_file);
2444 }
2445
2446 static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2447                                        struct file *out,
2448                                        loff_t *ppos,
2449                                        size_t len,
2450                                        unsigned int flags)
2451 {
2452         int ret;
2453         struct address_space *mapping = out->f_mapping;
2454         struct inode *inode = mapping->host;
2455         struct splice_desc sd = {
2456                 .total_len = len,
2457                 .flags = flags,
2458                 .pos = *ppos,
2459                 .u.file = out,
2460         };
2461
2462
2463         trace_ocfs2_file_splice_write(inode, out, out->f_path.dentry,
2464                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2465                         out->f_path.dentry->d_name.len,
2466                         out->f_path.dentry->d_name.name, len);
2467
2468         pipe_lock(pipe);
2469
2470         splice_from_pipe_begin(&sd);
2471         do {
2472                 ret = splice_from_pipe_next(pipe, &sd);
2473                 if (ret <= 0)
2474                         break;
2475
2476                 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2477                 ret = ocfs2_rw_lock(inode, 1);
2478                 if (ret < 0)
2479                         mlog_errno(ret);
2480                 else {
2481                         ret = ocfs2_splice_to_file(pipe, out, &sd);
2482                         ocfs2_rw_unlock(inode, 1);
2483                 }
2484                 mutex_unlock(&inode->i_mutex);
2485         } while (ret > 0);
2486         splice_from_pipe_end(pipe, &sd);
2487
2488         pipe_unlock(pipe);
2489
2490         if (sd.num_spliced)
2491                 ret = sd.num_spliced;
2492
2493         if (ret > 0) {
2494                 int err;
2495
2496                 err = generic_write_sync(out, *ppos, ret);
2497                 if (err)
2498                         ret = err;
2499                 else
2500                         *ppos += ret;
2501
2502                 balance_dirty_pages_ratelimited(mapping);
2503         }
2504
2505         return ret;
2506 }
2507
2508 static ssize_t ocfs2_file_splice_read(struct file *in,
2509                                       loff_t *ppos,
2510                                       struct pipe_inode_info *pipe,
2511                                       size_t len,
2512                                       unsigned int flags)
2513 {
2514         int ret = 0, lock_level = 0;
2515         struct inode *inode = file_inode(in);
2516
2517         trace_ocfs2_file_splice_read(inode, in, in->f_path.dentry,
2518                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2519                         in->f_path.dentry->d_name.len,
2520                         in->f_path.dentry->d_name.name, len);
2521
2522         /*
2523          * See the comment in ocfs2_file_aio_read()
2524          */
2525         ret = ocfs2_inode_lock_atime(inode, in->f_path.mnt, &lock_level);
2526         if (ret < 0) {
2527                 mlog_errno(ret);
2528                 goto bail;
2529         }
2530         ocfs2_inode_unlock(inode, lock_level);
2531
2532         ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2533
2534 bail:
2535         return ret;
2536 }
2537
2538 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2539                                    const struct iovec *iov,
2540                                    unsigned long nr_segs,
2541                                    loff_t pos)
2542 {
2543         int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2544         struct file *filp = iocb->ki_filp;
2545         struct inode *inode = file_inode(filp);
2546
2547         trace_ocfs2_file_aio_read(inode, filp, filp->f_path.dentry,
2548                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2549                         filp->f_path.dentry->d_name.len,
2550                         filp->f_path.dentry->d_name.name, nr_segs);
2551
2552
2553         if (!inode) {
2554                 ret = -EINVAL;
2555                 mlog_errno(ret);
2556                 goto bail;
2557         }
2558
2559         ocfs2_iocb_clear_sem_locked(iocb);
2560
2561         /*
2562          * buffered reads protect themselves in ->readpage().  O_DIRECT reads
2563          * need locks to protect pending reads from racing with truncate.
2564          */
2565         if (filp->f_flags & O_DIRECT) {
2566                 have_alloc_sem = 1;
2567                 ocfs2_iocb_set_sem_locked(iocb);
2568
2569                 ret = ocfs2_rw_lock(inode, 0);
2570                 if (ret < 0) {
2571                         mlog_errno(ret);
2572                         goto bail;
2573                 }
2574                 rw_level = 0;
2575                 /* communicate with ocfs2_dio_end_io */
2576                 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2577         }
2578
2579         /*
2580          * We're fine letting folks race truncates and extending
2581          * writes with read across the cluster, just like they can
2582          * locally. Hence no rw_lock during read.
2583          *
2584          * Take and drop the meta data lock to update inode fields
2585          * like i_size. This allows the checks down below
2586          * generic_file_aio_read() a chance of actually working.
2587          */
2588         ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level);
2589         if (ret < 0) {
2590                 mlog_errno(ret);
2591                 goto bail;
2592         }
2593         ocfs2_inode_unlock(inode, lock_level);
2594
2595         ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2596         trace_generic_file_aio_read_ret(ret);
2597
2598         /* buffered aio wouldn't have proper lock coverage today */
2599         BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2600
2601         /* see ocfs2_file_aio_write */
2602         if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2603                 rw_level = -1;
2604                 have_alloc_sem = 0;
2605         }
2606
2607 bail:
2608         if (have_alloc_sem)
2609                 ocfs2_iocb_clear_sem_locked(iocb);
2610
2611         if (rw_level != -1)
2612                 ocfs2_rw_unlock(inode, rw_level);
2613
2614         return ret;
2615 }
2616
2617 /* Refer generic_file_llseek_unlocked() */
2618 static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int whence)
2619 {
2620         struct inode *inode = file->f_mapping->host;
2621         int ret = 0;
2622
2623         mutex_lock(&inode->i_mutex);
2624
2625         switch (whence) {
2626         case SEEK_SET:
2627                 break;
2628         case SEEK_END:
2629                 offset += inode->i_size;
2630                 break;
2631         case SEEK_CUR:
2632                 if (offset == 0) {
2633                         offset = file->f_pos;
2634                         goto out;
2635                 }
2636                 offset += file->f_pos;
2637                 break;
2638         case SEEK_DATA:
2639         case SEEK_HOLE:
2640                 ret = ocfs2_seek_data_hole_offset(file, &offset, whence);
2641                 if (ret)
2642                         goto out;
2643                 break;
2644         default:
2645                 ret = -EINVAL;
2646                 goto out;
2647         }
2648
2649         offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
2650
2651 out:
2652         mutex_unlock(&inode->i_mutex);
2653         if (ret)
2654                 return ret;
2655         return offset;
2656 }
2657
2658 const struct inode_operations ocfs2_file_iops = {
2659         .setattr        = ocfs2_setattr,
2660         .getattr        = ocfs2_getattr,
2661         .permission     = ocfs2_permission,
2662         .setxattr       = generic_setxattr,
2663         .getxattr       = generic_getxattr,
2664         .listxattr      = ocfs2_listxattr,
2665         .removexattr    = generic_removexattr,
2666         .fiemap         = ocfs2_fiemap,
2667         .get_acl        = ocfs2_iop_get_acl,
2668         .set_acl        = ocfs2_iop_set_acl,
2669 };
2670
2671 const struct inode_operations ocfs2_special_file_iops = {
2672         .setattr        = ocfs2_setattr,
2673         .getattr        = ocfs2_getattr,
2674         .permission     = ocfs2_permission,
2675         .get_acl        = ocfs2_iop_get_acl,
2676         .set_acl        = ocfs2_iop_set_acl,
2677 };
2678
2679 /*
2680  * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2681  * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2682  */
2683 const struct file_operations ocfs2_fops = {
2684         .llseek         = ocfs2_file_llseek,
2685         .read           = do_sync_read,
2686         .write          = do_sync_write,
2687         .mmap           = ocfs2_mmap,
2688         .fsync          = ocfs2_sync_file,
2689         .release        = ocfs2_file_release,
2690         .open           = ocfs2_file_open,
2691         .aio_read       = ocfs2_file_aio_read,
2692         .aio_write      = ocfs2_file_aio_write,
2693         .unlocked_ioctl = ocfs2_ioctl,
2694 #ifdef CONFIG_COMPAT
2695         .compat_ioctl   = ocfs2_compat_ioctl,
2696 #endif
2697         .lock           = ocfs2_lock,
2698         .flock          = ocfs2_flock,
2699         .splice_read    = ocfs2_file_splice_read,
2700         .splice_write   = ocfs2_file_splice_write,
2701         .fallocate      = ocfs2_fallocate,
2702 };
2703
2704 const struct file_operations ocfs2_dops = {
2705         .llseek         = generic_file_llseek,
2706         .read           = generic_read_dir,
2707         .iterate        = ocfs2_readdir,
2708         .fsync          = ocfs2_sync_file,
2709         .release        = ocfs2_dir_release,
2710         .open           = ocfs2_dir_open,
2711         .unlocked_ioctl = ocfs2_ioctl,
2712 #ifdef CONFIG_COMPAT
2713         .compat_ioctl   = ocfs2_compat_ioctl,
2714 #endif
2715         .lock           = ocfs2_lock,
2716         .flock          = ocfs2_flock,
2717 };
2718
2719 /*
2720  * POSIX-lockless variants of our file_operations.
2721  *
2722  * These will be used if the underlying cluster stack does not support
2723  * posix file locking, if the user passes the "localflocks" mount
2724  * option, or if we have a local-only fs.
2725  *
2726  * ocfs2_flock is in here because all stacks handle UNIX file locks,
2727  * so we still want it in the case of no stack support for
2728  * plocks. Internally, it will do the right thing when asked to ignore
2729  * the cluster.
2730  */
2731 const struct file_operations ocfs2_fops_no_plocks = {
2732         .llseek         = ocfs2_file_llseek,
2733         .read           = do_sync_read,
2734         .write          = do_sync_write,
2735         .mmap           = ocfs2_mmap,
2736         .fsync          = ocfs2_sync_file,
2737         .release        = ocfs2_file_release,
2738         .open           = ocfs2_file_open,
2739         .aio_read       = ocfs2_file_aio_read,
2740         .aio_write      = ocfs2_file_aio_write,
2741         .unlocked_ioctl = ocfs2_ioctl,
2742 #ifdef CONFIG_COMPAT
2743         .compat_ioctl   = ocfs2_compat_ioctl,
2744 #endif
2745         .flock          = ocfs2_flock,
2746         .splice_read    = ocfs2_file_splice_read,
2747         .splice_write   = ocfs2_file_splice_write,
2748         .fallocate      = ocfs2_fallocate,
2749 };
2750
2751 const struct file_operations ocfs2_dops_no_plocks = {
2752         .llseek         = generic_file_llseek,
2753         .read           = generic_read_dir,
2754         .iterate        = ocfs2_readdir,
2755         .fsync          = ocfs2_sync_file,
2756         .release        = ocfs2_dir_release,
2757         .open           = ocfs2_dir_open,
2758         .unlocked_ioctl = ocfs2_ioctl,
2759 #ifdef CONFIG_COMPAT
2760         .compat_ioctl   = ocfs2_compat_ioctl,
2761 #endif
2762         .flock          = ocfs2_flock,
2763 };