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         err = filemap_write_and_wait_range(inode->i_mapping, start, end);
 189         if (err)
 190                 return err;
 191
 192         /*
 193          * Probably don't need the i_mutex at all in here, just putting it here
 194          * to be consistent with how fsync used to be called, someone more
 195          * familiar with the fs could possibly remove it.
 196          */
 197         mutex_lock(&inode->i_mutex);
 198         if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) {
 199                 /*
 200                  * We still have to flush drive's caches to get data to the
 201                  * platter
 202                  */
 203                 if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
 204                         blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
 205                 goto bail;
 206         }
 207
 208         journal = osb->journal->j_journal;
 209         err = jbd2_journal_force_commit(journal);
 210
 211 bail:
 212         if (err)
 213                 mlog_errno(err);
 214         mutex_unlock(&inode->i_mutex);
 215
 216         return (err < 0) ? -EIO : 0;
 217 }
 218
 219 int ocfs2_should_update_atime(struct inode *inode,
 220                               struct vfsmount *vfsmnt)
 221 {
 222         struct timespec now;
 223         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 224
 225         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 226                 return 0;
 227
 228         if ((inode->i_flags & S_NOATIME) ||
 229             ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
 230                 return 0;
 231
 232         /*
 233          * We can be called with no vfsmnt structure - NFSD will
 234          * sometimes do this.
 235          *
 236          * Note that our action here is different than touch_atime() -
 237          * if we can't tell whether this is a noatime mount, then we
 238          * don't know whether to trust the value of s_atime_quantum.
 239          */
 240         if (vfsmnt == NULL)
 241                 return 0;
 242
 243         if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
 244             ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 245                 return 0;
 246
 247         if (vfsmnt->mnt_flags & MNT_RELATIME) {
 248                 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
 249                     (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
 250                         return 1;
 251
 252                 return 0;
 253         }
 254
 255         now = CURRENT_TIME;
 256         if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
 257                 return 0;
 258         else
 259                 return 1;
 260 }
 261
 262 int ocfs2_update_inode_atime(struct inode *inode,
 263                              struct buffer_head *bh)
 264 {
 265         int ret;
 266         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 267         handle_t *handle;
 268         struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
 269
 270         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 271         if (IS_ERR(handle)) {
 272                 ret = PTR_ERR(handle);
 273                 mlog_errno(ret);
 274                 goto out;
 275         }
 276
 277         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 278                                       OCFS2_JOURNAL_ACCESS_WRITE);
 279         if (ret) {
 280                 mlog_errno(ret);
 281                 goto out_commit;
 282         }
 283
 284         /*
 285          * Don't use ocfs2_mark_inode_dirty() here as we don't always
 286          * have i_mutex to guard against concurrent changes to other
 287          * inode fields.
 288          */
 289         inode->i_atime = CURRENT_TIME;
 290         di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 291         di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 292         ocfs2_journal_dirty(handle, bh);
 293
 294 out_commit:
 295         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 296 out:
 297         return ret;
 298 }
 299
 300 static int ocfs2_set_inode_size(handle_t *handle,
 301                                 struct inode *inode,
 302                                 struct buffer_head *fe_bh,
 303                                 u64 new_i_size)
 304 {
 305         int status;
 306
 307         i_size_write(inode, new_i_size);
 308         inode->i_blocks = ocfs2_inode_sector_count(inode);
 309         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 310
 311         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 312         if (status < 0) {
 313                 mlog_errno(status);
 314                 goto bail;
 315         }
 316
 317 bail:
 318         return status;
 319 }
 320
 321 int ocfs2_simple_size_update(struct inode *inode,
 322                              struct buffer_head *di_bh,
 323                              u64 new_i_size)
 324 {
 325         int ret;
 326         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 327         handle_t *handle = NULL;
 328
 329         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 330         if (IS_ERR(handle)) {
 331                 ret = PTR_ERR(handle);
 332                 mlog_errno(ret);
 333                 goto out;
 334         }
 335
 336         ret = ocfs2_set_inode_size(handle, inode, di_bh,
 337                                    new_i_size);
 338         if (ret < 0)
 339                 mlog_errno(ret);
 340
 341         ocfs2_commit_trans(osb, handle);
 342 out:
 343         return ret;
 344 }
 345
 346 static int ocfs2_cow_file_pos(struct inode *inode,
 347                               struct buffer_head *fe_bh,
 348                               u64 offset)
 349 {
 350         int status;
 351         u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 352         unsigned int num_clusters = 0;
 353         unsigned int ext_flags = 0;
 354
 355         /*
 356          * If the new offset is aligned to the range of the cluster, there is
 357          * no space for ocfs2_zero_range_for_truncate to fill, so no need to
 358          * CoW either.
 359          */
 360         if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
 361                 return 0;
 362
 363         status = ocfs2_get_clusters(inode, cpos, &phys,
 364                                     &num_clusters, &ext_flags);
 365         if (status) {
 366                 mlog_errno(status);
 367                 goto out;
 368         }
 369
 370         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
 371                 goto out;
 372
 373         return ocfs2_refcount_cow(inode, NULL, fe_bh, cpos, 1, cpos+1);
 374
 375 out:
 376         return status;
 377 }
 378
 379 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
 380                                      struct inode *inode,
 381                                      struct buffer_head *fe_bh,
 382                                      u64 new_i_size)
 383 {
 384         int status;
 385         handle_t *handle;
 386         struct ocfs2_dinode *di;
 387         u64 cluster_bytes;
 388
 389         /*
 390          * We need to CoW the cluster contains the offset if it is reflinked
 391          * since we will call ocfs2_zero_range_for_truncate later which will
 392          * write "0" from offset to the end of the cluster.
 393          */
 394         status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
 395         if (status) {
 396                 mlog_errno(status);
 397                 return status;
 398         }
 399
 400         /* TODO: This needs to actually orphan the inode in this
 401          * transaction. */
 402
 403         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 404         if (IS_ERR(handle)) {
 405                 status = PTR_ERR(handle);
 406                 mlog_errno(status);
 407                 goto out;
 408         }
 409
 410         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 411                                          OCFS2_JOURNAL_ACCESS_WRITE);
 412         if (status < 0) {
 413                 mlog_errno(status);
 414                 goto out_commit;
 415         }
 416
 417         /*
 418          * Do this before setting i_size.
 419          */
 420         cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
 421         status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
 422                                                cluster_bytes);
 423         if (status) {
 424                 mlog_errno(status);
 425                 goto out_commit;
 426         }
 427
 428         i_size_write(inode, new_i_size);
 429         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 430
 431         di = (struct ocfs2_dinode *) fe_bh->b_data;
 432         di->i_size = cpu_to_le64(new_i_size);
 433         di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
 434         di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 435
 436         ocfs2_journal_dirty(handle, fe_bh);
 437
 438 out_commit:
 439         ocfs2_commit_trans(osb, handle);
 440 out:
 441         return status;
 442 }
 443
 444 static int ocfs2_truncate_file(struct inode *inode,
 445                                struct buffer_head *di_bh,
 446                                u64 new_i_size)
 447 {
 448         int status = 0;
 449         struct ocfs2_dinode *fe = NULL;
 450         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 451
 452         /* We trust di_bh because it comes from ocfs2_inode_lock(), which
 453          * already validated it */
 454         fe = (struct ocfs2_dinode *) di_bh->b_data;
 455
 456         trace_ocfs2_truncate_file((unsigned long long)OCFS2_I(inode)->ip_blkno,
 457                                   (unsigned long long)le64_to_cpu(fe->i_size),
 458                                   (unsigned long long)new_i_size);
 459
 460         mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
 461                         "Inode %llu, inode i_size = %lld != di "
 462                         "i_size = %llu, i_flags = 0x%x\n",
 463                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 464                         i_size_read(inode),
 465                         (unsigned long long)le64_to_cpu(fe->i_size),
 466                         le32_to_cpu(fe->i_flags));
 467
 468         if (new_i_size > le64_to_cpu(fe->i_size)) {
 469                 trace_ocfs2_truncate_file_error(
 470                         (unsigned long long)le64_to_cpu(fe->i_size),
 471                         (unsigned long long)new_i_size);
 472                 status = -EINVAL;
 473                 mlog_errno(status);
 474                 goto bail;
 475         }
 476
 477         /* lets handle the simple truncate cases before doing any more
 478          * cluster locking. */
 479         if (new_i_size == le64_to_cpu(fe->i_size))
 480                 goto bail;
 481
 482         down_write(&OCFS2_I(inode)->ip_alloc_sem);
 483
 484         ocfs2_resv_discard(&osb->osb_la_resmap,
 485                            &OCFS2_I(inode)->ip_la_data_resv);
 486
 487         /*
 488          * The inode lock forced other nodes to sync and drop their
 489          * pages, which (correctly) happens even if we have a truncate
 490          * without allocation change - ocfs2 cluster sizes can be much
 491          * greater than page size, so we have to truncate them
 492          * anyway.
 493          */
 494         unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
 495         truncate_inode_pages(inode->i_mapping, new_i_size);
 496
 497         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
 498                 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
 499                                                i_size_read(inode), 1);
 500                 if (status)
 501                         mlog_errno(status);
 502
 503                 goto bail_unlock_sem;
 504         }
 505
 506         /* alright, we're going to need to do a full blown alloc size
 507          * change. Orphan the inode so that recovery can complete the
 508          * truncate if necessary. This does the task of marking
 509          * i_size. */
 510         status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
 511         if (status < 0) {
 512                 mlog_errno(status);
 513                 goto bail_unlock_sem;
 514         }
 515
 516         status = ocfs2_commit_truncate(osb, inode, di_bh);
 517         if (status < 0) {
 518                 mlog_errno(status);
 519                 goto bail_unlock_sem;
 520         }
 521
 522         /* TODO: orphan dir cleanup here. */
 523 bail_unlock_sem:
 524         up_write(&OCFS2_I(inode)->ip_alloc_sem);
 525
 526 bail:
 527         if (!status && OCFS2_I(inode)->ip_clusters == 0)
 528                 status = ocfs2_try_remove_refcount_tree(inode, di_bh);
 529
 530         return status;
 531 }
 532
 533 /*
 534  * extend file allocation only here.
 535  * we'll update all the disk stuff, and oip->alloc_size
 536  *
 537  * expect stuff to be locked, a transaction started and enough data /
 538  * metadata reservations in the contexts.
 539  *
 540  * Will return -EAGAIN, and a reason if a restart is needed.
 541  * If passed in, *reason will always be set, even in error.
 542  */
 543 int ocfs2_add_inode_data(struct ocfs2_super *osb,
 544                          struct inode *inode,
 545                          u32 *logical_offset,
 546                          u32 clusters_to_add,
 547                          int mark_unwritten,
 548                          struct buffer_head *fe_bh,
 549                          handle_t *handle,
 550                          struct ocfs2_alloc_context *data_ac,
 551                          struct ocfs2_alloc_context *meta_ac,
 552                          enum ocfs2_alloc_restarted *reason_ret)
 553 {
 554         int ret;
 555         struct ocfs2_extent_tree et;
 556
 557         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
 558         ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
 559                                           clusters_to_add, mark_unwritten,
 560                                           data_ac, meta_ac, reason_ret);
 561
 562         return ret;
 563 }
 564
 565 static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
 566                                      u32 clusters_to_add, int mark_unwritten)
 567 {
 568         int status = 0;
 569         int restart_func = 0;
 570         int credits;
 571         u32 prev_clusters;
 572         struct buffer_head *bh = NULL;
 573         struct ocfs2_dinode *fe = NULL;
 574         handle_t *handle = NULL;
 575         struct ocfs2_alloc_context *data_ac = NULL;
 576         struct ocfs2_alloc_context *meta_ac = NULL;
 577         enum ocfs2_alloc_restarted why;
 578         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 579         struct ocfs2_extent_tree et;
 580         int did_quota = 0;
 581
 582         /*
 583          * This function only exists for file systems which don't
 584          * support holes.
 585          */
 586         BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
 587
 588         status = ocfs2_read_inode_block(inode, &bh);
 589         if (status < 0) {
 590                 mlog_errno(status);
 591                 goto leave;
 592         }
 593         fe = (struct ocfs2_dinode *) bh->b_data;
 594
 595 restart_all:
 596         BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
 597
 598         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
 599         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 600                                        &data_ac, &meta_ac);
 601         if (status) {
 602                 mlog_errno(status);
 603                 goto leave;
 604         }
 605
 606         credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list,
 607                                             clusters_to_add);
 608         handle = ocfs2_start_trans(osb, credits);
 609         if (IS_ERR(handle)) {
 610                 status = PTR_ERR(handle);
 611                 handle = NULL;
 612                 mlog_errno(status);
 613                 goto leave;
 614         }
 615
 616 restarted_transaction:
 617         trace_ocfs2_extend_allocation(
 618                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
 619                 (unsigned long long)i_size_read(inode),
 620                 le32_to_cpu(fe->i_clusters), clusters_to_add,
 621                 why, restart_func);
 622
 623         status = dquot_alloc_space_nodirty(inode,
 624                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 625         if (status)
 626                 goto leave;
 627         did_quota = 1;
 628
 629         /* reserve a write to the file entry early on - that we if we
 630          * run out of credits in the allocation path, we can still
 631          * update i_size. */
 632         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 633                                          OCFS2_JOURNAL_ACCESS_WRITE);
 634         if (status < 0) {
 635                 mlog_errno(status);
 636                 goto leave;
 637         }
 638
 639         prev_clusters = OCFS2_I(inode)->ip_clusters;
 640
 641         status = ocfs2_add_inode_data(osb,
 642                                       inode,
 643                                       &logical_start,
 644                                       clusters_to_add,
 645                                       mark_unwritten,
 646                                       bh,
 647                                       handle,
 648                                       data_ac,
 649                                       meta_ac,
 650                                       &why);
 651         if ((status < 0) && (status != -EAGAIN)) {
 652                 if (status != -ENOSPC)
 653                         mlog_errno(status);
 654                 goto leave;
 655         }
 656
 657         ocfs2_journal_dirty(handle, bh);
 658
 659         spin_lock(&OCFS2_I(inode)->ip_lock);
 660         clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
 661         spin_unlock(&OCFS2_I(inode)->ip_lock);
 662         /* Release unused quota reservation */
 663         dquot_free_space(inode,
 664                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 665         did_quota = 0;
 666
 667         if (why != RESTART_NONE && clusters_to_add) {
 668                 if (why == RESTART_META) {
 669                         restart_func = 1;
 670                         status = 0;
 671                 } else {
 672                         BUG_ON(why != RESTART_TRANS);
 673
 674                         /* TODO: This can be more intelligent. */
 675                         credits = ocfs2_calc_extend_credits(osb->sb,
 676                                                             &fe->id2.i_list,
 677                                                             clusters_to_add);
 678                         status = ocfs2_extend_trans(handle, credits);
 679                         if (status < 0) {
 680                                 /* handle still has to be committed at
 681                                  * this point. */
 682                                 status = -ENOMEM;
 683                                 mlog_errno(status);
 684                                 goto leave;
 685                         }
 686                         goto restarted_transaction;
 687                 }
 688         }
 689
 690         trace_ocfs2_extend_allocation_end(OCFS2_I(inode)->ip_blkno,
 691              le32_to_cpu(fe->i_clusters),
 692              (unsigned long long)le64_to_cpu(fe->i_size),
 693              OCFS2_I(inode)->ip_clusters,
 694              (unsigned long long)i_size_read(inode));
 695
 696 leave:
 697         if (status < 0 && did_quota)
 698                 dquot_free_space(inode,
 699                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 700         if (handle) {
 701                 ocfs2_commit_trans(osb, handle);
 702                 handle = NULL;
 703         }
 704         if (data_ac) {
 705                 ocfs2_free_alloc_context(data_ac);
 706                 data_ac = NULL;
 707         }
 708         if (meta_ac) {
 709                 ocfs2_free_alloc_context(meta_ac);
 710                 meta_ac = NULL;
 711         }
 712         if ((!status) && restart_func) {
 713                 restart_func = 0;
 714                 goto restart_all;
 715         }
 716         brelse(bh);
 717         bh = NULL;
 718
 719         return status;
 720 }
 721
 722 /*
 723  * While a write will already be ordering the data, a truncate will not.
 724  * Thus, we need to explicitly order the zeroed pages.
 725  */
 726 static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode)
 727 {
 728         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 729         handle_t *handle = NULL;
 730         int ret = 0;
 731
 732         if (!ocfs2_should_order_data(inode))
 733                 goto out;
 734
 735         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 736         if (IS_ERR(handle)) {
 737                 ret = -ENOMEM;
 738                 mlog_errno(ret);
 739                 goto out;
 740         }
 741
 742         ret = ocfs2_jbd2_file_inode(handle, inode);
 743         if (ret < 0)
 744                 mlog_errno(ret);
 745
 746 out:
 747         if (ret) {
 748                 if (!IS_ERR(handle))
 749                         ocfs2_commit_trans(osb, handle);
 750                 handle = ERR_PTR(ret);
 751         }
 752         return handle;
 753 }
 754
 755 /* Some parts of this taken from generic_cont_expand, which turned out
 756  * to be too fragile to do exactly what we need without us having to
 757  * worry about recursive locking in ->write_begin() and ->write_end(). */
 758 static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
 759                                  u64 abs_to)
 760 {
 761         struct address_space *mapping = inode->i_mapping;
 762         struct page *page;
 763         unsigned long index = abs_from >> PAGE_CACHE_SHIFT;
 764         handle_t *handle = NULL;
 765         int ret = 0;
 766         unsigned zero_from, zero_to, block_start, block_end;
 767
 768         BUG_ON(abs_from >= abs_to);
 769         BUG_ON(abs_to > (((u64)index + 1) << PAGE_CACHE_SHIFT));
 770         BUG_ON(abs_from & (inode->i_blkbits - 1));
 771
 772         page = find_or_create_page(mapping, index, GFP_NOFS);
 773         if (!page) {
 774                 ret = -ENOMEM;
 775                 mlog_errno(ret);
 776                 goto out;
 777         }
 778
 779         /* Get the offsets within the page that we want to zero */
 780         zero_from = abs_from & (PAGE_CACHE_SIZE - 1);
 781         zero_to = abs_to & (PAGE_CACHE_SIZE - 1);
 782         if (!zero_to)
 783                 zero_to = PAGE_CACHE_SIZE;
 784
 785         trace_ocfs2_write_zero_page(
 786                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 787                         (unsigned long long)abs_from,
 788                         (unsigned long long)abs_to,
 789                         index, zero_from, zero_to);
 790
 791         /* We know that zero_from is block aligned */
 792         for (block_start = zero_from; block_start < zero_to;
 793              block_start = block_end) {
 794                 block_end = block_start + (1 << inode->i_blkbits);
 795
 796                 /*
 797                  * block_start is block-aligned.  Bump it by one to force
 798                  * __block_write_begin and block_commit_write to zero the
 799                  * whole block.
 800                  */
 801                 ret = __block_write_begin(page, block_start + 1, 0,
 802                                           ocfs2_get_block);
 803                 if (ret < 0) {
 804                         mlog_errno(ret);
 805                         goto out_unlock;
 806                 }
 807
 808                 if (!handle) {
 809                         handle = ocfs2_zero_start_ordered_transaction(inode);
 810                         if (IS_ERR(handle)) {
 811                                 ret = PTR_ERR(handle);
 812                                 handle = NULL;
 813                                 break;
 814                         }
 815                 }
 816
 817                 /* must not update i_size! */
 818                 ret = block_commit_write(page, block_start + 1,
 819                                          block_start + 1);
 820                 if (ret < 0)
 821                         mlog_errno(ret);
 822                 else
 823                         ret = 0;
 824         }
 825
 826         if (handle)
 827                 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 828
 829 out_unlock:
 830         unlock_page(page);
 831         page_cache_release(page);
 832 out:
 833         return ret;
 834 }
 835
 836 /*
 837  * Find the next range to zero.  We do this in terms of bytes because
 838  * that's what ocfs2_zero_extend() wants, and it is dealing with the
 839  * pagecache.  We may return multiple extents.
 840  *
 841  * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
 842  * needs to be zeroed.  range_start and range_end return the next zeroing
 843  * range.  A subsequent call should pass the previous range_end as its
 844  * zero_start.  If range_end is 0, there's nothing to do.
 845  *
 846  * Unwritten extents are skipped over.  Refcounted extents are CoWd.
 847  */
 848 static int ocfs2_zero_extend_get_range(struct inode *inode,
 849                                        struct buffer_head *di_bh,
 850                                        u64 zero_start, u64 zero_end,
 851                                        u64 *range_start, u64 *range_end)
 852 {
 853         int rc = 0, needs_cow = 0;
 854         u32 p_cpos, zero_clusters = 0;
 855         u32 zero_cpos =
 856                 zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 857         u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
 858         unsigned int num_clusters = 0;
 859         unsigned int ext_flags = 0;
 860
 861         while (zero_cpos < last_cpos) {
 862                 rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
 863                                         &num_clusters, &ext_flags);
 864                 if (rc) {
 865                         mlog_errno(rc);
 866                         goto out;
 867                 }
 868
 869                 if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
 870                         zero_clusters = num_clusters;
 871                         if (ext_flags & OCFS2_EXT_REFCOUNTED)
 872                                 needs_cow = 1;
 873                         break;
 874                 }
 875
 876                 zero_cpos += num_clusters;
 877         }
 878         if (!zero_clusters) {
 879                 *range_end = 0;
 880                 goto out;
 881         }
 882
 883         while ((zero_cpos + zero_clusters) < last_cpos) {
 884                 rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
 885                                         &p_cpos, &num_clusters,
 886                                         &ext_flags);
 887                 if (rc) {
 888                         mlog_errno(rc);
 889                         goto out;
 890                 }
 891
 892                 if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
 893                         break;
 894                 if (ext_flags & OCFS2_EXT_REFCOUNTED)
 895                         needs_cow = 1;
 896                 zero_clusters += num_clusters;
 897         }
 898         if ((zero_cpos + zero_clusters) > last_cpos)
 899                 zero_clusters = last_cpos - zero_cpos;
 900
 901         if (needs_cow) {
 902                 rc = ocfs2_refcount_cow(inode, NULL, di_bh, zero_cpos,
 903                                         zero_clusters, UINT_MAX);
 904                 if (rc) {
 905                         mlog_errno(rc);
 906                         goto out;
 907                 }
 908         }
 909
 910         *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
 911         *range_end = ocfs2_clusters_to_bytes(inode->i_sb,
 912                                              zero_cpos + zero_clusters);
 913
 914 out:
 915         return rc;
 916 }
 917
 918 /*
 919  * Zero one range returned from ocfs2_zero_extend_get_range().  The caller
 920  * has made sure that the entire range needs zeroing.
 921  */
 922 static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
 923                                    u64 range_end)
 924 {
 925         int rc = 0;
 926         u64 next_pos;
 927         u64 zero_pos = range_start;
 928
 929         trace_ocfs2_zero_extend_range(
 930                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 931                         (unsigned long long)range_start,
 932                         (unsigned long long)range_end);
 933         BUG_ON(range_start >= range_end);
 934
 935         while (zero_pos < range_end) {
 936                 next_pos = (zero_pos & PAGE_CACHE_MASK) + PAGE_CACHE_SIZE;
 937                 if (next_pos > range_end)
 938                         next_pos = range_end;
 939                 rc = ocfs2_write_zero_page(inode, zero_pos, next_pos);
 940                 if (rc < 0) {
 941                         mlog_errno(rc);
 942                         break;
 943                 }
 944                 zero_pos = next_pos;
 945
 946                 /*
 947                  * Very large extends have the potential to lock up
 948                  * the cpu for extended periods of time.
 949                  */
 950                 cond_resched();
 951         }
 952
 953         return rc;
 954 }
 955
 956 int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
 957                       loff_t zero_to_size)
 958 {
 959         int ret = 0;
 960         u64 zero_start, range_start = 0, range_end = 0;
 961         struct super_block *sb = inode->i_sb;
 962
 963         zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
 964         trace_ocfs2_zero_extend((unsigned long long)OCFS2_I(inode)->ip_blkno,
 965                                 (unsigned long long)zero_start,
 966                                 (unsigned long long)i_size_read(inode));
 967         while (zero_start < zero_to_size) {
 968                 ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
 969                                                   zero_to_size,
 970                                                   &range_start,
 971                                                   &range_end);
 972                 if (ret) {
 973                         mlog_errno(ret);
 974                         break;
 975                 }
 976                 if (!range_end)
 977                         break;
 978                 /* Trim the ends */
 979                 if (range_start < zero_start)
 980                         range_start = zero_start;
 981                 if (range_end > zero_to_size)
 982                         range_end = zero_to_size;
 983
 984                 ret = ocfs2_zero_extend_range(inode, range_start,
 985                                               range_end);
 986                 if (ret) {
 987                         mlog_errno(ret);
 988                         break;
 989                 }
 990                 zero_start = range_end;
 991         }
 992
 993         return ret;
 994 }
 995
 996 int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
 997                           u64 new_i_size, u64 zero_to)
 998 {
 999         int ret;
1000         u32 clusters_to_add;
1001         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1002
1003         /*
1004          * Only quota files call this without a bh, and they can't be
1005          * refcounted.
1006          */
1007         BUG_ON(!di_bh && (oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
1008         BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
1009
1010         clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
1011         if (clusters_to_add < oi->ip_clusters)
1012                 clusters_to_add = 0;
1013         else
1014                 clusters_to_add -= oi->ip_clusters;
1015
1016         if (clusters_to_add) {
1017                 ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
1018                                                 clusters_to_add, 0);
1019                 if (ret) {
1020                         mlog_errno(ret);
1021                         goto out;
1022                 }
1023         }
1024
1025         /*
1026          * Call this even if we don't add any clusters to the tree. We
1027          * still need to zero the area between the old i_size and the
1028          * new i_size.
1029          */
1030         ret = ocfs2_zero_extend(inode, di_bh, zero_to);
1031         if (ret < 0)
1032                 mlog_errno(ret);
1033
1034 out:
1035         return ret;
1036 }
1037
1038 static int ocfs2_extend_file(struct inode *inode,
1039                              struct buffer_head *di_bh,
1040                              u64 new_i_size)
1041 {
1042         int ret = 0;
1043         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1044
1045         BUG_ON(!di_bh);
1046
1047         /* setattr sometimes calls us like this. */
1048         if (new_i_size == 0)
1049                 goto out;
1050
1051         if (i_size_read(inode) == new_i_size)
1052                 goto out;
1053         BUG_ON(new_i_size < i_size_read(inode));
1054
1055         /*
1056          * The alloc sem blocks people in read/write from reading our
1057          * allocation until we're done changing it. We depend on
1058          * i_mutex to block other extend/truncate calls while we're
1059          * here.  We even have to hold it for sparse files because there
1060          * might be some tail zeroing.
1061          */
1062         down_write(&oi->ip_alloc_sem);
1063
1064         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1065                 /*
1066                  * We can optimize small extends by keeping the inodes
1067                  * inline data.
1068                  */
1069                 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1070                         up_write(&oi->ip_alloc_sem);
1071                         goto out_update_size;
1072                 }
1073
1074                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1075                 if (ret) {
1076                         up_write(&oi->ip_alloc_sem);
1077                         mlog_errno(ret);
1078                         goto out;
1079                 }
1080         }
1081
1082         if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1083                 ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1084         else
1085                 ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1086                                             new_i_size);
1087
1088         up_write(&oi->ip_alloc_sem);
1089
1090         if (ret < 0) {
1091                 mlog_errno(ret);
1092                 goto out;
1093         }
1094
1095 out_update_size:
1096         ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1097         if (ret < 0)
1098                 mlog_errno(ret);
1099
1100 out:
1101         return ret;
1102 }
1103
1104 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1105 {
1106         int status = 0, size_change;
1107         struct inode *inode = dentry->d_inode;
1108         struct super_block *sb = inode->i_sb;
1109         struct ocfs2_super *osb = OCFS2_SB(sb);
1110         struct buffer_head *bh = NULL;
1111         handle_t *handle = NULL;
1112         struct dquot *transfer_to[MAXQUOTAS] = { };
1113         int qtype;
1114
1115         trace_ocfs2_setattr(inode, dentry,
1116                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
1117                             dentry->d_name.len, dentry->d_name.name,
1118                             attr->ia_valid, attr->ia_mode,
1119                             attr->ia_uid, attr->ia_gid);
1120
1121         /* ensuring we don't even attempt to truncate a symlink */
1122         if (S_ISLNK(inode->i_mode))
1123                 attr->ia_valid &= ~ATTR_SIZE;
1124
1125 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1126                            | ATTR_GID | ATTR_UID | ATTR_MODE)
1127         if (!(attr->ia_valid & OCFS2_VALID_ATTRS))
1128                 return 0;
1129
1130         status = inode_change_ok(inode, attr);
1131         if (status)
1132                 return status;
1133
1134         if (is_quota_modification(inode, attr))
1135                 dquot_initialize(inode);
1136         size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1137         if (size_change) {
1138                 status = ocfs2_rw_lock(inode, 1);
1139                 if (status < 0) {
1140                         mlog_errno(status);
1141                         goto bail;
1142                 }
1143         }
1144
1145         status = ocfs2_inode_lock(inode, &bh, 1);
1146         if (status < 0) {
1147                 if (status != -ENOENT)
1148                         mlog_errno(status);
1149                 goto bail_unlock_rw;
1150         }
1151
1152         if (size_change && attr->ia_size != i_size_read(inode)) {
1153                 status = inode_newsize_ok(inode, attr->ia_size);
1154                 if (status)
1155                         goto bail_unlock;
1156
1157                 inode_dio_wait(inode);
1158
1159                 if (i_size_read(inode) > attr->ia_size) {
1160                         if (ocfs2_should_order_data(inode)) {
1161                                 status = ocfs2_begin_ordered_truncate(inode,
1162                                                                       attr->ia_size);
1163                                 if (status)
1164                                         goto bail_unlock;
1165                         }
1166                         status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1167                 } else
1168                         status = ocfs2_extend_file(inode, bh, attr->ia_size);
1169                 if (status < 0) {
1170                         if (status != -ENOSPC)
1171                                 mlog_errno(status);
1172                         status = -ENOSPC;
1173                         goto bail_unlock;
1174                 }
1175         }
1176
1177         if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
1178             (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
1179                 /*
1180                  * Gather pointers to quota structures so that allocation /
1181                  * freeing of quota structures happens here and not inside
1182                  * dquot_transfer() where we have problems with lock ordering
1183                  */
1184                 if (attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid
1185                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1186                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1187                         transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(attr->ia_uid));
1188                         if (!transfer_to[USRQUOTA]) {
1189                                 status = -ESRCH;
1190                                 goto bail_unlock;
1191                         }
1192                 }
1193                 if (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid
1194                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1195                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1196                         transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(attr->ia_gid));
1197                         if (!transfer_to[GRPQUOTA]) {
1198                                 status = -ESRCH;
1199                                 goto bail_unlock;
1200                         }
1201                 }
1202                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1203                                            2 * ocfs2_quota_trans_credits(sb));
1204                 if (IS_ERR(handle)) {
1205                         status = PTR_ERR(handle);
1206                         mlog_errno(status);
1207                         goto bail_unlock;
1208                 }
1209                 status = __dquot_transfer(inode, transfer_to);
1210                 if (status < 0)
1211                         goto bail_commit;
1212         } else {
1213                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1214                 if (IS_ERR(handle)) {
1215                         status = PTR_ERR(handle);
1216                         mlog_errno(status);
1217                         goto bail_unlock;
1218                 }
1219         }
1220
1221         setattr_copy(inode, attr);
1222         mark_inode_dirty(inode);
1223
1224         status = ocfs2_mark_inode_dirty(handle, inode, bh);
1225         if (status < 0)
1226                 mlog_errno(status);
1227
1228 bail_commit:
1229         ocfs2_commit_trans(osb, handle);
1230 bail_unlock:
1231         ocfs2_inode_unlock(inode, 1);
1232 bail_unlock_rw:
1233         if (size_change)
1234                 ocfs2_rw_unlock(inode, 1);
1235 bail:
1236         brelse(bh);
1237
1238         /* Release quota pointers in case we acquired them */
1239         for (qtype = 0; qtype < MAXQUOTAS; qtype++)
1240                 dqput(transfer_to[qtype]);
1241
1242         if (!status && attr->ia_valid & ATTR_MODE) {
1243                 status = ocfs2_acl_chmod(inode);
1244                 if (status < 0)
1245                         mlog_errno(status);
1246         }
1247
1248         return status;
1249 }
1250
1251 int ocfs2_getattr(struct vfsmount *mnt,
1252                   struct dentry *dentry,
1253                   struct kstat *stat)
1254 {
1255         struct inode *inode = dentry->d_inode;
1256         struct super_block *sb = dentry->d_inode->i_sb;
1257         struct ocfs2_super *osb = sb->s_fs_info;
1258         int err;
1259
1260         err = ocfs2_inode_revalidate(dentry);
1261         if (err) {
1262                 if (err != -ENOENT)
1263                         mlog_errno(err);
1264                 goto bail;
1265         }
1266
1267         generic_fillattr(inode, stat);
1268
1269         /* We set the blksize from the cluster size for performance */
1270         stat->blksize = osb->s_clustersize;
1271
1272 bail:
1273         return err;
1274 }
1275
1276 int ocfs2_permission(struct inode *inode, int mask)
1277 {
1278         int ret;
1279
1280         if (mask & MAY_NOT_BLOCK)
1281                 return -ECHILD;
1282
1283         ret = ocfs2_inode_lock(inode, NULL, 0);
1284         if (ret) {
1285                 if (ret != -ENOENT)
1286                         mlog_errno(ret);
1287                 goto out;
1288         }
1289
1290         ret = generic_permission(inode, mask);
1291
1292         ocfs2_inode_unlock(inode, 0);
1293 out:
1294         return ret;
1295 }
1296
1297 static int __ocfs2_write_remove_suid(struct inode *inode,
1298                                      struct buffer_head *bh)
1299 {
1300         int ret;
1301         handle_t *handle;
1302         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1303         struct ocfs2_dinode *di;
1304
1305         trace_ocfs2_write_remove_suid(
1306                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1307                         inode->i_mode);
1308
1309         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1310         if (IS_ERR(handle)) {
1311                 ret = PTR_ERR(handle);
1312                 mlog_errno(ret);
1313                 goto out;
1314         }
1315
1316         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1317                                       OCFS2_JOURNAL_ACCESS_WRITE);
1318         if (ret < 0) {
1319                 mlog_errno(ret);
1320                 goto out_trans;
1321         }
1322
1323         inode->i_mode &= ~S_ISUID;
1324         if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1325                 inode->i_mode &= ~S_ISGID;
1326
1327         di = (struct ocfs2_dinode *) bh->b_data;
1328         di->i_mode = cpu_to_le16(inode->i_mode);
1329
1330         ocfs2_journal_dirty(handle, bh);
1331
1332 out_trans:
1333         ocfs2_commit_trans(osb, handle);
1334 out:
1335         return ret;
1336 }
1337
1338 /*
1339  * Will look for holes and unwritten extents in the range starting at
1340  * pos for count bytes (inclusive).
1341  */
1342 static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1343                                        size_t count)
1344 {
1345         int ret = 0;
1346         unsigned int extent_flags;
1347         u32 cpos, clusters, extent_len, phys_cpos;
1348         struct super_block *sb = inode->i_sb;
1349
1350         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1351         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1352
1353         while (clusters) {
1354                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1355                                          &extent_flags);
1356                 if (ret < 0) {
1357                         mlog_errno(ret);
1358                         goto out;
1359                 }
1360
1361                 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1362                         ret = 1;
1363                         break;
1364                 }
1365
1366                 if (extent_len > clusters)
1367                         extent_len = clusters;
1368
1369                 clusters -= extent_len;
1370                 cpos += extent_len;
1371         }
1372 out:
1373         return ret;
1374 }
1375
1376 static int ocfs2_write_remove_suid(struct inode *inode)
1377 {
1378         int ret;
1379         struct buffer_head *bh = NULL;
1380
1381         ret = ocfs2_read_inode_block(inode, &bh);
1382         if (ret < 0) {
1383                 mlog_errno(ret);
1384                 goto out;
1385         }
1386
1387         ret =  __ocfs2_write_remove_suid(inode, bh);
1388 out:
1389         brelse(bh);
1390         return ret;
1391 }
1392
1393 /*
1394  * Allocate enough extents to cover the region starting at byte offset
1395  * start for len bytes. Existing extents are skipped, any extents
1396  * added are marked as "unwritten".
1397  */
1398 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1399                                             u64 start, u64 len)
1400 {
1401         int ret;
1402         u32 cpos, phys_cpos, clusters, alloc_size;
1403         u64 end = start + len;
1404         struct buffer_head *di_bh = NULL;
1405
1406         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1407                 ret = ocfs2_read_inode_block(inode, &di_bh);
1408                 if (ret) {
1409                         mlog_errno(ret);
1410                         goto out;
1411                 }
1412
1413                 /*
1414                  * Nothing to do if the requested reservation range
1415                  * fits within the inode.
1416                  */
1417                 if (ocfs2_size_fits_inline_data(di_bh, end))
1418                         goto out;
1419
1420                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1421                 if (ret) {
1422                         mlog_errno(ret);
1423                         goto out;
1424                 }
1425         }
1426
1427         /*
1428          * We consider both start and len to be inclusive.
1429          */
1430         cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1431         clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1432         clusters -= cpos;
1433
1434         while (clusters) {
1435                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1436                                          &alloc_size, NULL);
1437                 if (ret) {
1438                         mlog_errno(ret);
1439                         goto out;
1440                 }
1441
1442                 /*
1443                  * Hole or existing extent len can be arbitrary, so
1444                  * cap it to our own allocation request.
1445                  */
1446                 if (alloc_size > clusters)
1447                         alloc_size = clusters;
1448
1449                 if (phys_cpos) {
1450                         /*
1451                          * We already have an allocation at this
1452                          * region so we can safely skip it.
1453                          */
1454                         goto next;
1455                 }
1456
1457                 ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1458                 if (ret) {
1459                         if (ret != -ENOSPC)
1460                                 mlog_errno(ret);
1461                         goto out;
1462                 }
1463
1464 next:
1465                 cpos += alloc_size;
1466                 clusters -= alloc_size;
1467         }
1468
1469         ret = 0;
1470 out:
1471
1472         brelse(di_bh);
1473         return ret;
1474 }
1475
1476 /*
1477  * Truncate a byte range, avoiding pages within partial clusters. This
1478  * preserves those pages for the zeroing code to write to.
1479  */
1480 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1481                                          u64 byte_len)
1482 {
1483         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1484         loff_t start, end;
1485         struct address_space *mapping = inode->i_mapping;
1486
1487         start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1488         end = byte_start + byte_len;
1489         end = end & ~(osb->s_clustersize - 1);
1490
1491         if (start < end) {
1492                 unmap_mapping_range(mapping, start, end - start, 0);
1493                 truncate_inode_pages_range(mapping, start, end - 1);
1494         }
1495 }
1496
1497 static int ocfs2_zero_partial_clusters(struct inode *inode,
1498                                        u64 start, u64 len)
1499 {
1500         int ret = 0;
1501         u64 tmpend, end = start + len;
1502         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1503         unsigned int csize = osb->s_clustersize;
1504         handle_t *handle;
1505
1506         /*
1507          * The "start" and "end" values are NOT necessarily part of
1508          * the range whose allocation is being deleted. Rather, this
1509          * is what the user passed in with the request. We must zero
1510          * partial clusters here. There's no need to worry about
1511          * physical allocation - the zeroing code knows to skip holes.
1512          */
1513         trace_ocfs2_zero_partial_clusters(
1514                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1515                 (unsigned long long)start, (unsigned long long)end);
1516
1517         /*
1518          * If both edges are on a cluster boundary then there's no
1519          * zeroing required as the region is part of the allocation to
1520          * be truncated.
1521          */
1522         if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1523                 goto out;
1524
1525         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1526         if (IS_ERR(handle)) {
1527                 ret = PTR_ERR(handle);
1528                 mlog_errno(ret);
1529                 goto out;
1530         }
1531
1532         /*
1533          * We want to get the byte offset of the end of the 1st cluster.
1534          */
1535         tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1536         if (tmpend > end)
1537                 tmpend = end;
1538
1539         trace_ocfs2_zero_partial_clusters_range1((unsigned long long)start,
1540                                                  (unsigned long long)tmpend);
1541
1542         ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1543         if (ret)
1544                 mlog_errno(ret);
1545
1546         if (tmpend < end) {
1547                 /*
1548                  * This may make start and end equal, but the zeroing
1549                  * code will skip any work in that case so there's no
1550                  * need to catch it up here.
1551                  */
1552                 start = end & ~(osb->s_clustersize - 1);
1553
1554                 trace_ocfs2_zero_partial_clusters_range2(
1555                         (unsigned long long)start, (unsigned long long)end);
1556
1557                 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1558                 if (ret)
1559                         mlog_errno(ret);
1560         }
1561
1562         ocfs2_commit_trans(osb, handle);
1563 out:
1564         return ret;
1565 }
1566
1567 static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1568 {
1569         int i;
1570         struct ocfs2_extent_rec *rec = NULL;
1571
1572         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1573
1574                 rec = &el->l_recs[i];
1575
1576                 if (le32_to_cpu(rec->e_cpos) < pos)
1577                         break;
1578         }
1579
1580         return i;
1581 }
1582
1583 /*
1584  * Helper to calculate the punching pos and length in one run, we handle the
1585  * following three cases in order:
1586  *
1587  * - remove the entire record
1588  * - remove a partial record
1589  * - no record needs to be removed (hole-punching completed)
1590 */
1591 static void ocfs2_calc_trunc_pos(struct inode *inode,
1592                                  struct ocfs2_extent_list *el,
1593                                  struct ocfs2_extent_rec *rec,
1594                                  u32 trunc_start, u32 *trunc_cpos,
1595                                  u32 *trunc_len, u32 *trunc_end,
1596                                  u64 *blkno, int *done)
1597 {
1598         int ret = 0;
1599         u32 coff, range;
1600
1601         range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1602
1603         if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1604                 /*
1605                  * remove an entire extent record.
1606                  */
1607                 *trunc_cpos = le32_to_cpu(rec->e_cpos);
1608                 /*
1609                  * Skip holes if any.
1610                  */
1611                 if (range < *trunc_end)
1612                         *trunc_end = range;
1613                 *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1614                 *blkno = le64_to_cpu(rec->e_blkno);
1615                 *trunc_end = le32_to_cpu(rec->e_cpos);
1616         } else if (range > trunc_start) {
1617                 /*
1618                  * remove a partial extent record, which means we're
1619                  * removing the last extent record.
1620                  */
1621                 *trunc_cpos = trunc_start;
1622                 /*
1623                  * skip hole if any.
1624                  */
1625                 if (range < *trunc_end)
1626                         *trunc_end = range;
1627                 *trunc_len = *trunc_end - trunc_start;
1628                 coff = trunc_start - le32_to_cpu(rec->e_cpos);
1629                 *blkno = le64_to_cpu(rec->e_blkno) +
1630                                 ocfs2_clusters_to_blocks(inode->i_sb, coff);
1631                 *trunc_end = trunc_start;
1632         } else {
1633                 /*
1634                  * It may have two following possibilities:
1635                  *
1636                  * - last record has been removed
1637                  * - trunc_start was within a hole
1638                  *
1639                  * both two cases mean the completion of hole punching.
1640                  */
1641                 ret = 1;
1642         }
1643
1644         *done = ret;
1645 }
1646
1647 static int ocfs2_remove_inode_range(struct inode *inode,
1648                                     struct buffer_head *di_bh, u64 byte_start,
1649                                     u64 byte_len)
1650 {
1651         int ret = 0, flags = 0, done = 0, i;
1652         u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1653         u32 cluster_in_el;
1654         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1655         struct ocfs2_cached_dealloc_ctxt dealloc;
1656         struct address_space *mapping = inode->i_mapping;
1657         struct ocfs2_extent_tree et;
1658         struct ocfs2_path *path = NULL;
1659         struct ocfs2_extent_list *el = NULL;
1660         struct ocfs2_extent_rec *rec = NULL;
1661         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1662         u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1663
1664         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1665         ocfs2_init_dealloc_ctxt(&dealloc);
1666
1667         trace_ocfs2_remove_inode_range(
1668                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1669                         (unsigned long long)byte_start,
1670                         (unsigned long long)byte_len);
1671
1672         if (byte_len == 0)
1673                 return 0;
1674
1675         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1676                 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1677                                             byte_start + byte_len, 0);
1678                 if (ret) {
1679                         mlog_errno(ret);
1680                         goto out;
1681                 }
1682                 /*
1683                  * There's no need to get fancy with the page cache
1684                  * truncate of an inline-data inode. We're talking
1685                  * about less than a page here, which will be cached
1686                  * in the dinode buffer anyway.
1687                  */
1688                 unmap_mapping_range(mapping, 0, 0, 0);
1689                 truncate_inode_pages(mapping, 0);
1690                 goto out;
1691         }
1692
1693         /*
1694          * For reflinks, we may need to CoW 2 clusters which might be
1695          * partially zero'd later, if hole's start and end offset were
1696          * within one cluster(means is not exactly aligned to clustersize).
1697          */
1698
1699         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
1700
1701                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1702                 if (ret) {
1703                         mlog_errno(ret);
1704                         goto out;
1705                 }
1706
1707                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1708                 if (ret) {
1709                         mlog_errno(ret);
1710                         goto out;
1711                 }
1712         }
1713
1714         trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1715         trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1716         cluster_in_el = trunc_end;
1717
1718         ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1719         if (ret) {
1720                 mlog_errno(ret);
1721                 goto out;
1722         }
1723
1724         path = ocfs2_new_path_from_et(&et);
1725         if (!path) {
1726                 ret = -ENOMEM;
1727                 mlog_errno(ret);
1728                 goto out;
1729         }
1730
1731         while (trunc_end > trunc_start) {
1732
1733                 ret = ocfs2_find_path(INODE_CACHE(inode), path,
1734                                       cluster_in_el);
1735                 if (ret) {
1736                         mlog_errno(ret);
1737                         goto out;
1738                 }
1739
1740                 el = path_leaf_el(path);
1741
1742                 i = ocfs2_find_rec(el, trunc_end);
1743                 /*
1744                  * Need to go to previous extent block.
1745                  */
1746                 if (i < 0) {
1747                         if (path->p_tree_depth == 0)
1748                                 break;
1749
1750                         ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1751                                                             path,
1752                                                             &cluster_in_el);
1753                         if (ret) {
1754                                 mlog_errno(ret);
1755                                 goto out;
1756                         }
1757
1758                         /*
1759                          * We've reached the leftmost extent block,
1760                          * it's safe to leave.
1761                          */
1762                         if (cluster_in_el == 0)
1763                                 break;
1764
1765                         /*
1766                          * The 'pos' searched for previous extent block is
1767                          * always one cluster less than actual trunc_end.
1768                          */
1769                         trunc_end = cluster_in_el + 1;
1770
1771                         ocfs2_reinit_path(path, 1);
1772
1773                         continue;
1774
1775                 } else
1776                         rec = &el->l_recs[i];
1777
1778                 ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1779                                      &trunc_len, &trunc_end, &blkno, &done);
1780                 if (done)
1781                         break;
1782
1783                 flags = rec->e_flags;
1784                 phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1785
1786                 ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1787                                                phys_cpos, trunc_len, flags,
1788                                                &dealloc, refcount_loc);
1789                 if (ret < 0) {
1790                         mlog_errno(ret);
1791                         goto out;
1792                 }
1793
1794                 cluster_in_el = trunc_end;
1795
1796                 ocfs2_reinit_path(path, 1);
1797         }
1798
1799         ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1800
1801 out:
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                 if (sr->l_len <= 0) {
1877                         ret = -EINVAL;
1878                         goto out_inode_unlock;
1879                 }
1880         }
1881
1882         if (file && should_remove_suid(file->f_path.dentry)) {
1883                 ret = __ocfs2_write_remove_suid(inode, di_bh);
1884                 if (ret) {
1885                         mlog_errno(ret);
1886                         goto out_inode_unlock;
1887                 }
1888         }
1889
1890         down_write(&OCFS2_I(inode)->ip_alloc_sem);
1891         switch (cmd) {
1892         case OCFS2_IOC_RESVSP:
1893         case OCFS2_IOC_RESVSP64:
1894                 /*
1895                  * This takes unsigned offsets, but the signed ones we
1896                  * pass have been checked against overflow above.
1897                  */
1898                 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1899                                                        sr->l_len);
1900                 break;
1901         case OCFS2_IOC_UNRESVSP:
1902         case OCFS2_IOC_UNRESVSP64:
1903                 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1904                                                sr->l_len);
1905                 break;
1906         default:
1907                 ret = -EINVAL;
1908         }
1909         up_write(&OCFS2_I(inode)->ip_alloc_sem);
1910         if (ret) {
1911                 mlog_errno(ret);
1912                 goto out_inode_unlock;
1913         }
1914
1915         /*
1916          * We update c/mtime for these changes
1917          */
1918         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1919         if (IS_ERR(handle)) {
1920                 ret = PTR_ERR(handle);
1921                 mlog_errno(ret);
1922                 goto out_inode_unlock;
1923         }
1924
1925         if (change_size && i_size_read(inode) < size)
1926                 i_size_write(inode, size);
1927
1928         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1929         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1930         if (ret < 0)
1931                 mlog_errno(ret);
1932
1933         if (file && (file->f_flags & O_SYNC))
1934                 handle->h_sync = 1;
1935
1936         ocfs2_commit_trans(osb, handle);
1937
1938 out_inode_unlock:
1939         brelse(di_bh);
1940         ocfs2_inode_unlock(inode, 1);
1941 out_rw_unlock:
1942         ocfs2_rw_unlock(inode, 1);
1943
1944 out:
1945         mutex_unlock(&inode->i_mutex);
1946         return ret;
1947 }
1948
1949 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1950                             struct ocfs2_space_resv *sr)
1951 {
1952         struct inode *inode = file->f_path.dentry->d_inode;
1953         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1954         int ret;
1955
1956         if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1957             !ocfs2_writes_unwritten_extents(osb))
1958                 return -ENOTTY;
1959         else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1960                  !ocfs2_sparse_alloc(osb))
1961                 return -ENOTTY;
1962
1963         if (!S_ISREG(inode->i_mode))
1964                 return -EINVAL;
1965
1966         if (!(file->f_mode & FMODE_WRITE))
1967                 return -EBADF;
1968
1969         ret = mnt_want_write_file(file);
1970         if (ret)
1971                 return ret;
1972         ret = __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1973         mnt_drop_write_file(file);
1974         return ret;
1975 }
1976
1977 static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
1978                             loff_t len)
1979 {
1980         struct inode *inode = file->f_path.dentry->d_inode;
1981         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1982         struct ocfs2_space_resv sr;
1983         int change_size = 1;
1984         int cmd = OCFS2_IOC_RESVSP64;
1985
1986         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1987                 return -EOPNOTSUPP;
1988         if (!ocfs2_writes_unwritten_extents(osb))
1989                 return -EOPNOTSUPP;
1990
1991         if (mode & FALLOC_FL_KEEP_SIZE)
1992                 change_size = 0;
1993
1994         if (mode & FALLOC_FL_PUNCH_HOLE)
1995                 cmd = OCFS2_IOC_UNRESVSP64;
1996
1997         sr.l_whence = 0;
1998         sr.l_start = (s64)offset;
1999         sr.l_len = (s64)len;
2000
2001         return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
2002                                          change_size);
2003 }
2004
2005 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2006                                    size_t count)
2007 {
2008         int ret = 0;
2009         unsigned int extent_flags;
2010         u32 cpos, clusters, extent_len, phys_cpos;
2011         struct super_block *sb = inode->i_sb;
2012
2013         if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2014             !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
2015             OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2016                 return 0;
2017
2018         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2019         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2020
2021         while (clusters) {
2022                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2023                                          &extent_flags);
2024                 if (ret < 0) {
2025                         mlog_errno(ret);
2026                         goto out;
2027                 }
2028
2029                 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2030                         ret = 1;
2031                         break;
2032                 }
2033
2034                 if (extent_len > clusters)
2035                         extent_len = clusters;
2036
2037                 clusters -= extent_len;
2038                 cpos += extent_len;
2039         }
2040 out:
2041         return ret;
2042 }
2043
2044 static void ocfs2_aiodio_wait(struct inode *inode)
2045 {
2046         wait_queue_head_t *wq = ocfs2_ioend_wq(inode);
2047
2048         wait_event(*wq, (atomic_read(&OCFS2_I(inode)->ip_unaligned_aio) == 0));
2049 }
2050
2051 static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
2052 {
2053         int blockmask = inode->i_sb->s_blocksize - 1;
2054         loff_t final_size = pos + count;
2055
2056         if ((pos & blockmask) || (final_size & blockmask))
2057                 return 1;
2058         return 0;
2059 }
2060
2061 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
2062                                             struct file *file,
2063                                             loff_t pos, size_t count,
2064                                             int *meta_level)
2065 {
2066         int ret;
2067         struct buffer_head *di_bh = NULL;
2068         u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2069         u32 clusters =
2070                 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2071
2072         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2073         if (ret) {
2074                 mlog_errno(ret);
2075                 goto out;
2076         }
2077
2078         *meta_level = 1;
2079
2080         ret = ocfs2_refcount_cow(inode, file, di_bh, cpos, clusters, UINT_MAX);
2081         if (ret)
2082                 mlog_errno(ret);
2083 out:
2084         brelse(di_bh);
2085         return ret;
2086 }
2087
2088 static int ocfs2_prepare_inode_for_write(struct file *file,
2089                                          loff_t *ppos,
2090                                          size_t count,
2091                                          int appending,
2092                                          int *direct_io,
2093                                          int *has_refcount)
2094 {
2095         int ret = 0, meta_level = 0;
2096         struct dentry *dentry = file->f_path.dentry;
2097         struct inode *inode = dentry->d_inode;
2098         loff_t saved_pos = 0, end;
2099
2100         /*
2101          * We start with a read level meta lock and only jump to an ex
2102          * if we need to make modifications here.
2103          */
2104         for(;;) {
2105                 ret = ocfs2_inode_lock(inode, NULL, meta_level);
2106                 if (ret < 0) {
2107                         meta_level = -1;
2108                         mlog_errno(ret);
2109                         goto out;
2110                 }
2111
2112                 /* Clear suid / sgid if necessary. We do this here
2113                  * instead of later in the write path because
2114                  * remove_suid() calls ->setattr without any hint that
2115                  * we may have already done our cluster locking. Since
2116                  * ocfs2_setattr() *must* take cluster locks to
2117                  * proceed, this will lead us to recursively lock the
2118                  * inode. There's also the dinode i_size state which
2119                  * can be lost via setattr during extending writes (we
2120                  * set inode->i_size at the end of a write. */
2121                 if (should_remove_suid(dentry)) {
2122                         if (meta_level == 0) {
2123                                 ocfs2_inode_unlock(inode, meta_level);
2124                                 meta_level = 1;
2125                                 continue;
2126                         }
2127
2128                         ret = ocfs2_write_remove_suid(inode);
2129                         if (ret < 0) {
2130                                 mlog_errno(ret);
2131                                 goto out_unlock;
2132                         }
2133                 }
2134
2135                 /* work on a copy of ppos until we're sure that we won't have
2136                  * to recalculate it due to relocking. */
2137                 if (appending)
2138                         saved_pos = i_size_read(inode);
2139                 else
2140                         saved_pos = *ppos;
2141
2142                 end = saved_pos + count;
2143
2144                 ret = ocfs2_check_range_for_refcount(inode, saved_pos, count);
2145                 if (ret == 1) {
2146                         ocfs2_inode_unlock(inode, meta_level);
2147                         meta_level = -1;
2148
2149                         ret = ocfs2_prepare_inode_for_refcount(inode,
2150                                                                file,
2151                                                                saved_pos,
2152                                                                count,
2153                                                                &meta_level);
2154                         if (has_refcount)
2155                                 *has_refcount = 1;
2156                         if (direct_io)
2157                                 *direct_io = 0;
2158                 }
2159
2160                 if (ret < 0) {
2161                         mlog_errno(ret);
2162                         goto out_unlock;
2163                 }
2164
2165                 /*
2166                  * Skip the O_DIRECT checks if we don't need
2167                  * them.
2168                  */
2169                 if (!direct_io || !(*direct_io))
2170                         break;
2171
2172                 /*
2173                  * There's no sane way to do direct writes to an inode
2174                  * with inline data.
2175                  */
2176                 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2177                         *direct_io = 0;
2178                         break;
2179                 }
2180
2181                 /*
2182                  * Allowing concurrent direct writes means
2183                  * i_size changes wouldn't be synchronized, so
2184                  * one node could wind up truncating another
2185                  * nodes writes.
2186                  */
2187                 if (end > i_size_read(inode)) {
2188                         *direct_io = 0;
2189                         break;
2190                 }
2191
2192                 /*
2193                  * We don't fill holes during direct io, so
2194                  * check for them here. If any are found, the
2195                  * caller will have to retake some cluster
2196                  * locks and initiate the io as buffered.
2197                  */
2198                 ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
2199                 if (ret == 1) {
2200                         *direct_io = 0;
2201                         ret = 0;
2202                 } else if (ret < 0)
2203                         mlog_errno(ret);
2204                 break;
2205         }
2206
2207         if (appending)
2208                 *ppos = saved_pos;
2209
2210 out_unlock:
2211         trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
2212                                             saved_pos, appending, count,
2213                                             direct_io, has_refcount);
2214
2215         if (meta_level >= 0)
2216                 ocfs2_inode_unlock(inode, meta_level);
2217
2218 out:
2219         return ret;
2220 }
2221
2222 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
2223                                     const struct iovec *iov,
2224                                     unsigned long nr_segs,
2225                                     loff_t pos)
2226 {
2227         int ret, direct_io, appending, rw_level, have_alloc_sem  = 0;
2228         int can_do_direct, has_refcount = 0;
2229         ssize_t written = 0;
2230         size_t ocount;          /* original count */
2231         size_t count;           /* after file limit checks */
2232         loff_t old_size, *ppos = &iocb->ki_pos;
2233         u32 old_clusters;
2234         struct file *file = iocb->ki_filp;
2235         struct inode *inode = file->f_path.dentry->d_inode;
2236         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2237         int full_coherency = !(osb->s_mount_opt &
2238                                OCFS2_MOUNT_COHERENCY_BUFFERED);
2239         int unaligned_dio = 0;
2240
2241         trace_ocfs2_file_aio_write(inode, file, file->f_path.dentry,
2242                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
2243                 file->f_path.dentry->d_name.len,
2244                 file->f_path.dentry->d_name.name,
2245                 (unsigned int)nr_segs);
2246
2247         if (iocb->ki_left == 0)
2248                 return 0;
2249
2250         sb_start_write(inode->i_sb);
2251
2252         appending = file->f_flags & O_APPEND ? 1 : 0;
2253         direct_io = file->f_flags & O_DIRECT ? 1 : 0;
2254
2255         mutex_lock(&inode->i_mutex);
2256
2257         ocfs2_iocb_clear_sem_locked(iocb);
2258
2259 relock:
2260         /* to match setattr's i_mutex -> rw_lock ordering */
2261         if (direct_io) {
2262                 have_alloc_sem = 1;
2263                 /* communicate with ocfs2_dio_end_io */
2264                 ocfs2_iocb_set_sem_locked(iocb);
2265         }
2266
2267         /*
2268          * Concurrent O_DIRECT writes are allowed with
2269          * mount_option "coherency=buffered".
2270          */
2271         rw_level = (!direct_io || full_coherency);
2272
2273         ret = ocfs2_rw_lock(inode, rw_level);
2274         if (ret < 0) {
2275                 mlog_errno(ret);
2276                 goto out_sems;
2277         }
2278
2279         /*
2280          * O_DIRECT writes with "coherency=full" need to take EX cluster
2281          * inode_lock to guarantee coherency.
2282          */
2283         if (direct_io && full_coherency) {
2284                 /*
2285                  * We need to take and drop the inode lock to force
2286                  * other nodes to drop their caches.  Buffered I/O
2287                  * already does this in write_begin().
2288                  */
2289                 ret = ocfs2_inode_lock(inode, NULL, 1);
2290                 if (ret < 0) {
2291                         mlog_errno(ret);
2292                         goto out_sems;
2293                 }
2294
2295                 ocfs2_inode_unlock(inode, 1);
2296         }
2297
2298         can_do_direct = direct_io;
2299         ret = ocfs2_prepare_inode_for_write(file, ppos,
2300                                             iocb->ki_left, appending,
2301                                             &can_do_direct, &has_refcount);
2302         if (ret < 0) {
2303                 mlog_errno(ret);
2304                 goto out;
2305         }
2306
2307         if (direct_io && !is_sync_kiocb(iocb))
2308                 unaligned_dio = ocfs2_is_io_unaligned(inode, iocb->ki_left,
2309                                                       *ppos);
2310
2311         /*
2312          * We can't complete the direct I/O as requested, fall back to
2313          * buffered I/O.
2314          */
2315         if (direct_io && !can_do_direct) {
2316                 ocfs2_rw_unlock(inode, rw_level);
2317
2318                 have_alloc_sem = 0;
2319                 rw_level = -1;
2320
2321                 direct_io = 0;
2322                 goto relock;
2323         }
2324
2325         if (unaligned_dio) {
2326                 /*
2327                  * Wait on previous unaligned aio to complete before
2328                  * proceeding.
2329                  */
2330                 ocfs2_aiodio_wait(inode);
2331
2332                 /* Mark the iocb as needing a decrement in ocfs2_dio_end_io */
2333                 atomic_inc(&OCFS2_I(inode)->ip_unaligned_aio);
2334                 ocfs2_iocb_set_unaligned_aio(iocb);
2335         }
2336
2337         /*
2338          * To later detect whether a journal commit for sync writes is
2339          * necessary, we sample i_size, and cluster count here.
2340          */
2341         old_size = i_size_read(inode);
2342         old_clusters = OCFS2_I(inode)->ip_clusters;
2343
2344         /* communicate with ocfs2_dio_end_io */
2345         ocfs2_iocb_set_rw_locked(iocb, rw_level);
2346
2347         ret = generic_segment_checks(iov, &nr_segs, &ocount,
2348                                      VERIFY_READ);
2349         if (ret)
2350                 goto out_dio;
2351
2352         count = ocount;
2353         ret = generic_write_checks(file, ppos, &count,
2354                                    S_ISBLK(inode->i_mode));
2355         if (ret)
2356                 goto out_dio;
2357
2358         if (direct_io) {
2359                 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
2360                                                     ppos, count, ocount);
2361                 if (written < 0) {
2362                         ret = written;
2363                         goto out_dio;
2364                 }
2365         } else {
2366                 current->backing_dev_info = file->f_mapping->backing_dev_info;
2367                 written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos,
2368                                                       ppos, count, 0);
2369                 current->backing_dev_info = NULL;
2370         }
2371
2372 out_dio:
2373         /* buffered aio wouldn't have proper lock coverage today */
2374         BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2375
2376         if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
2377             ((file->f_flags & O_DIRECT) && !direct_io)) {
2378                 ret = filemap_fdatawrite_range(file->f_mapping, pos,
2379                                                pos + count - 1);
2380                 if (ret < 0)
2381                         written = ret;
2382
2383                 if (!ret && ((old_size != i_size_read(inode)) ||
2384                              (old_clusters != OCFS2_I(inode)->ip_clusters) ||
2385                              has_refcount)) {
2386                         ret = jbd2_journal_force_commit(osb->journal->j_journal);
2387                         if (ret < 0)
2388                                 written = ret;
2389                 }
2390
2391                 if (!ret)
2392                         ret = filemap_fdatawait_range(file->f_mapping, pos,
2393                                                       pos + count - 1);
2394         }
2395
2396         /*
2397          * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2398          * function pointer which is called when o_direct io completes so that
2399          * it can unlock our rw lock.
2400          * Unfortunately there are error cases which call end_io and others
2401          * that don't.  so we don't have to unlock the rw_lock if either an
2402          * async dio is going to do it in the future or an end_io after an
2403          * error has already done it.
2404          */
2405         if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2406                 rw_level = -1;
2407                 have_alloc_sem = 0;
2408                 unaligned_dio = 0;
2409         }
2410
2411         if (unaligned_dio) {
2412                 ocfs2_iocb_clear_unaligned_aio(iocb);
2413                 atomic_dec(&OCFS2_I(inode)->ip_unaligned_aio);
2414         }
2415
2416 out:
2417         if (rw_level != -1)
2418                 ocfs2_rw_unlock(inode, rw_level);
2419
2420 out_sems:
2421         if (have_alloc_sem)
2422                 ocfs2_iocb_clear_sem_locked(iocb);
2423
2424         mutex_unlock(&inode->i_mutex);
2425         sb_end_write(inode->i_sb);
2426
2427         if (written)
2428                 ret = written;
2429         return ret;
2430 }
2431
2432 static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
2433                                 struct file *out,
2434                                 struct splice_desc *sd)
2435 {
2436         int ret;
2437
2438         ret = ocfs2_prepare_inode_for_write(out, &sd->pos,
2439                                             sd->total_len, 0, NULL, NULL);
2440         if (ret < 0) {
2441                 mlog_errno(ret);
2442                 return ret;
2443         }
2444
2445         return splice_from_pipe_feed(pipe, sd, pipe_to_file);
2446 }
2447
2448 static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2449                                        struct file *out,
2450                                        loff_t *ppos,
2451                                        size_t len,
2452                                        unsigned int flags)
2453 {
2454         int ret;
2455         struct address_space *mapping = out->f_mapping;
2456         struct inode *inode = mapping->host;
2457         struct splice_desc sd = {
2458                 .total_len = len,
2459                 .flags = flags,
2460                 .pos = *ppos,
2461                 .u.file = out,
2462         };
2463
2464
2465         trace_ocfs2_file_splice_write(inode, out, out->f_path.dentry,
2466                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2467                         out->f_path.dentry->d_name.len,
2468                         out->f_path.dentry->d_name.name, len);
2469
2470         if (pipe->inode)
2471                 mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT);
2472
2473         splice_from_pipe_begin(&sd);
2474         do {
2475                 ret = splice_from_pipe_next(pipe, &sd);
2476                 if (ret <= 0)
2477                         break;
2478
2479                 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2480                 ret = ocfs2_rw_lock(inode, 1);
2481                 if (ret < 0)
2482                         mlog_errno(ret);
2483                 else {
2484                         ret = ocfs2_splice_to_file(pipe, out, &sd);
2485                         ocfs2_rw_unlock(inode, 1);
2486                 }
2487                 mutex_unlock(&inode->i_mutex);
2488         } while (ret > 0);
2489         splice_from_pipe_end(pipe, &sd);
2490
2491         if (pipe->inode)
2492                 mutex_unlock(&pipe->inode->i_mutex);
2493
2494         if (sd.num_spliced)
2495                 ret = sd.num_spliced;
2496
2497         if (ret > 0) {
2498                 int err;
2499
2500                 err = generic_write_sync(out, *ppos, ret);
2501                 if (err)
2502                         ret = err;
2503                 else
2504                         *ppos += ret;
2505
2506                 balance_dirty_pages_ratelimited(mapping);
2507         }
2508
2509         return ret;
2510 }
2511
2512 static ssize_t ocfs2_file_splice_read(struct file *in,
2513                                       loff_t *ppos,
2514                                       struct pipe_inode_info *pipe,
2515                                       size_t len,
2516                                       unsigned int flags)
2517 {
2518         int ret = 0, lock_level = 0;
2519         struct inode *inode = in->f_path.dentry->d_inode;
2520
2521         trace_ocfs2_file_splice_read(inode, in, in->f_path.dentry,
2522                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2523                         in->f_path.dentry->d_name.len,
2524                         in->f_path.dentry->d_name.name, len);
2525
2526         /*
2527          * See the comment in ocfs2_file_aio_read()
2528          */
2529         ret = ocfs2_inode_lock_atime(inode, in->f_vfsmnt, &lock_level);
2530         if (ret < 0) {
2531                 mlog_errno(ret);
2532                 goto bail;
2533         }
2534         ocfs2_inode_unlock(inode, lock_level);
2535
2536         ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2537
2538 bail:
2539         return ret;
2540 }
2541
2542 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2543                                    const struct iovec *iov,
2544                                    unsigned long nr_segs,
2545                                    loff_t pos)
2546 {
2547         int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2548         struct file *filp = iocb->ki_filp;
2549         struct inode *inode = filp->f_path.dentry->d_inode;
2550
2551         trace_ocfs2_file_aio_read(inode, filp, filp->f_path.dentry,
2552                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2553                         filp->f_path.dentry->d_name.len,
2554                         filp->f_path.dentry->d_name.name, nr_segs);
2555
2556
2557         if (!inode) {
2558                 ret = -EINVAL;
2559                 mlog_errno(ret);
2560                 goto bail;
2561         }
2562
2563         ocfs2_iocb_clear_sem_locked(iocb);
2564
2565         /*
2566          * buffered reads protect themselves in ->readpage().  O_DIRECT reads
2567          * need locks to protect pending reads from racing with truncate.
2568          */
2569         if (filp->f_flags & O_DIRECT) {
2570                 have_alloc_sem = 1;
2571                 ocfs2_iocb_set_sem_locked(iocb);
2572
2573                 ret = ocfs2_rw_lock(inode, 0);
2574                 if (ret < 0) {
2575                         mlog_errno(ret);
2576                         goto bail;
2577                 }
2578                 rw_level = 0;
2579                 /* communicate with ocfs2_dio_end_io */
2580                 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2581         }
2582
2583         /*
2584          * We're fine letting folks race truncates and extending
2585          * writes with read across the cluster, just like they can
2586          * locally. Hence no rw_lock during read.
2587          *
2588          * Take and drop the meta data lock to update inode fields
2589          * like i_size. This allows the checks down below
2590          * generic_file_aio_read() a chance of actually working.
2591          */
2592         ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2593         if (ret < 0) {
2594                 mlog_errno(ret);
2595                 goto bail;
2596         }
2597         ocfs2_inode_unlock(inode, lock_level);
2598
2599         ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2600         trace_generic_file_aio_read_ret(ret);
2601
2602         /* buffered aio wouldn't have proper lock coverage today */
2603         BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2604
2605         /* see ocfs2_file_aio_write */
2606         if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2607                 rw_level = -1;
2608                 have_alloc_sem = 0;
2609         }
2610
2611 bail:
2612         if (have_alloc_sem)
2613                 ocfs2_iocb_clear_sem_locked(iocb);
2614
2615         if (rw_level != -1)
2616                 ocfs2_rw_unlock(inode, rw_level);
2617
2618         return ret;
2619 }
2620
2621 /* Refer generic_file_llseek_unlocked() */
2622 static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int whence)
2623 {
2624         struct inode *inode = file->f_mapping->host;
2625         int ret = 0;
2626
2627         mutex_lock(&inode->i_mutex);
2628
2629         switch (whence) {
2630         case SEEK_SET:
2631                 break;
2632         case SEEK_END:
2633                 offset += inode->i_size;
2634                 break;
2635         case SEEK_CUR:
2636                 if (offset == 0) {
2637                         offset = file->f_pos;
2638                         goto out;
2639                 }
2640                 offset += file->f_pos;
2641                 break;
2642         case SEEK_DATA:
2643         case SEEK_HOLE:
2644                 ret = ocfs2_seek_data_hole_offset(file, &offset, whence);
2645                 if (ret)
2646                         goto out;
2647                 break;
2648         default:
2649                 ret = -EINVAL;
2650                 goto out;
2651         }
2652
2653         if (offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET))
2654                 ret = -EINVAL;
2655         if (!ret && offset > inode->i_sb->s_maxbytes)
2656                 ret = -EINVAL;
2657         if (ret)
2658                 goto out;
2659
2660         if (offset != file->f_pos) {
2661                 file->f_pos = offset;
2662                 file->f_version = 0;
2663         }
2664
2665 out:
2666         mutex_unlock(&inode->i_mutex);
2667         if (ret)
2668                 return ret;
2669         return offset;
2670 }
2671
2672 const struct inode_operations ocfs2_file_iops = {
2673         .setattr        = ocfs2_setattr,
2674         .getattr        = ocfs2_getattr,
2675         .permission     = ocfs2_permission,
2676         .setxattr       = generic_setxattr,
2677         .getxattr       = generic_getxattr,
2678         .listxattr      = ocfs2_listxattr,
2679         .removexattr    = generic_removexattr,
2680         .fiemap         = ocfs2_fiemap,
2681         .get_acl        = ocfs2_iop_get_acl,
2682 };
2683
2684 const struct inode_operations ocfs2_special_file_iops = {
2685         .setattr        = ocfs2_setattr,
2686         .getattr        = ocfs2_getattr,
2687         .permission     = ocfs2_permission,
2688         .get_acl        = ocfs2_iop_get_acl,
2689 };
2690
2691 /*
2692  * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2693  * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2694  */
2695 const struct file_operations ocfs2_fops = {
2696         .llseek         = ocfs2_file_llseek,
2697         .read           = do_sync_read,
2698         .write          = do_sync_write,
2699         .mmap           = ocfs2_mmap,
2700         .fsync          = ocfs2_sync_file,
2701         .release        = ocfs2_file_release,
2702         .open           = ocfs2_file_open,
2703         .aio_read       = ocfs2_file_aio_read,
2704         .aio_write      = ocfs2_file_aio_write,
2705         .unlocked_ioctl = ocfs2_ioctl,
2706 #ifdef CONFIG_COMPAT
2707         .compat_ioctl   = ocfs2_compat_ioctl,
2708 #endif
2709         .lock           = ocfs2_lock,
2710         .flock          = ocfs2_flock,
2711         .splice_read    = ocfs2_file_splice_read,
2712         .splice_write   = ocfs2_file_splice_write,
2713         .fallocate      = ocfs2_fallocate,
2714 };
2715
2716 const struct file_operations ocfs2_dops = {
2717         .llseek         = generic_file_llseek,
2718         .read           = generic_read_dir,
2719         .readdir        = ocfs2_readdir,
2720         .fsync          = ocfs2_sync_file,
2721         .release        = ocfs2_dir_release,
2722         .open           = ocfs2_dir_open,
2723         .unlocked_ioctl = ocfs2_ioctl,
2724 #ifdef CONFIG_COMPAT
2725         .compat_ioctl   = ocfs2_compat_ioctl,
2726 #endif
2727         .lock           = ocfs2_lock,
2728         .flock          = ocfs2_flock,
2729 };
2730
2731 /*
2732  * POSIX-lockless variants of our file_operations.
2733  *
2734  * These will be used if the underlying cluster stack does not support
2735  * posix file locking, if the user passes the "localflocks" mount
2736  * option, or if we have a local-only fs.
2737  *
2738  * ocfs2_flock is in here because all stacks handle UNIX file locks,
2739  * so we still want it in the case of no stack support for
2740  * plocks. Internally, it will do the right thing when asked to ignore
2741  * the cluster.
2742  */
2743 const struct file_operations ocfs2_fops_no_plocks = {
2744         .llseek         = ocfs2_file_llseek,
2745         .read           = do_sync_read,
2746         .write          = do_sync_write,
2747         .mmap           = ocfs2_mmap,
2748         .fsync          = ocfs2_sync_file,
2749         .release        = ocfs2_file_release,
2750         .open           = ocfs2_file_open,
2751         .aio_read       = ocfs2_file_aio_read,
2752         .aio_write      = ocfs2_file_aio_write,
2753         .unlocked_ioctl = ocfs2_ioctl,
2754 #ifdef CONFIG_COMPAT
2755         .compat_ioctl   = ocfs2_compat_ioctl,
2756 #endif
2757         .flock          = ocfs2_flock,
2758         .splice_read    = ocfs2_file_splice_read,
2759         .splice_write   = ocfs2_file_splice_write,
2760         .fallocate      = ocfs2_fallocate,
2761 };
2762
2763 const struct file_operations ocfs2_dops_no_plocks = {
2764         .llseek         = generic_file_llseek,
2765         .read           = generic_read_dir,
2766         .readdir        = ocfs2_readdir,
2767         .fsync          = ocfs2_sync_file,
2768         .release        = ocfs2_dir_release,
2769         .open           = ocfs2_dir_open,
2770         .unlocked_ioctl = ocfs2_ioctl,
2771 #ifdef CONFIG_COMPAT
2772         .compat_ioctl   = ocfs2_compat_ioctl,
2773 #endif
2774         .flock          = ocfs2_flock,
2775 };