fs/ocfs2/file.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* -*- mode: c; c-basic-offset: 8; -*-
   3  * vim: noexpandtab sw=8 ts=8 sts=0:
   4  *
   5  * file.c
   6  *
   7  * File open, close, extend, truncate
   8  *
   9  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
  10  */
  11
  12 #include <linux/capability.h>
  13 #include <linux/fs.h>
  14 #include <linux/types.h>
  15 #include <linux/slab.h>
  16 #include <linux/highmem.h>
  17 #include <linux/pagemap.h>
  18 #include <linux/uio.h>
  19 #include <linux/sched.h>
  20 #include <linux/splice.h>
  21 #include <linux/mount.h>
  22 #include <linux/writeback.h>
  23 #include <linux/falloc.h>
  24 #include <linux/quotaops.h>
  25 #include <linux/blkdev.h>
  26 #include <linux/backing-dev.h>
  27
  28 #include <cluster/masklog.h>
  29
  30 #include "ocfs2.h"
  31
  32 #include "alloc.h"
  33 #include "aops.h"
  34 #include "dir.h"
  35 #include "dlmglue.h"
  36 #include "extent_map.h"
  37 #include "file.h"
  38 #include "sysfile.h"
  39 #include "inode.h"
  40 #include "ioctl.h"
  41 #include "journal.h"
  42 #include "locks.h"
  43 #include "mmap.h"
  44 #include "suballoc.h"
  45 #include "super.h"
  46 #include "xattr.h"
  47 #include "acl.h"
  48 #include "quota.h"
  49 #include "refcounttree.h"
  50 #include "ocfs2_trace.h"
  51
  52 #include "buffer_head_io.h"
  53
  54 static int ocfs2_init_file_private(struct inode *inode, struct file *file)
  55 {
  56         struct ocfs2_file_private *fp;
  57
  58         fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
  59         if (!fp)
  60                 return -ENOMEM;
  61
  62         fp->fp_file = file;
  63         mutex_init(&fp->fp_mutex);
  64         ocfs2_file_lock_res_init(&fp->fp_flock, fp);
  65         file->private_data = fp;
  66
  67         return 0;
  68 }
  69
  70 static void ocfs2_free_file_private(struct inode *inode, struct file *file)
  71 {
  72         struct ocfs2_file_private *fp = file->private_data;
  73         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  74
  75         if (fp) {
  76                 ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
  77                 ocfs2_lock_res_free(&fp->fp_flock);
  78                 kfree(fp);
  79                 file->private_data = NULL;
  80         }
  81 }
  82
  83 static int ocfs2_file_open(struct inode *inode, struct file *file)
  84 {
  85         int status;
  86         int mode = file->f_flags;
  87         struct ocfs2_inode_info *oi = OCFS2_I(inode);
  88
  89         trace_ocfs2_file_open(inode, file, file->f_path.dentry,
  90                               (unsigned long long)oi->ip_blkno,
  91                               file->f_path.dentry->d_name.len,
  92                               file->f_path.dentry->d_name.name, mode);
  93
  94         if (file->f_mode & FMODE_WRITE) {
  95                 status = dquot_initialize(inode);
  96                 if (status)
  97                         goto leave;
  98         }
  99
 100         spin_lock(&oi->ip_lock);
 101
 102         /* Check that the inode hasn't been wiped from disk by another
 103          * node. If it hasn't then we're safe as long as we hold the
 104          * spin lock until our increment of open count. */
 105         if (oi->ip_flags & OCFS2_INODE_DELETED) {
 106                 spin_unlock(&oi->ip_lock);
 107
 108                 status = -ENOENT;
 109                 goto leave;
 110         }
 111
 112         if (mode & O_DIRECT)
 113                 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
 114
 115         oi->ip_open_count++;
 116         spin_unlock(&oi->ip_lock);
 117
 118         status = ocfs2_init_file_private(inode, file);
 119         if (status) {
 120                 /*
 121                  * We want to set open count back if we're failing the
 122                  * open.
 123                  */
 124                 spin_lock(&oi->ip_lock);
 125                 oi->ip_open_count--;
 126                 spin_unlock(&oi->ip_lock);
 127         }
 128
 129         file->f_mode |= FMODE_NOWAIT;
 130
 131 leave:
 132         return status;
 133 }
 134
 135 static int ocfs2_file_release(struct inode *inode, struct file *file)
 136 {
 137         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 138
 139         spin_lock(&oi->ip_lock);
 140         if (!--oi->ip_open_count)
 141                 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
 142
 143         trace_ocfs2_file_release(inode, file, file->f_path.dentry,
 144                                  oi->ip_blkno,
 145                                  file->f_path.dentry->d_name.len,
 146                                  file->f_path.dentry->d_name.name,
 147                                  oi->ip_open_count);
 148         spin_unlock(&oi->ip_lock);
 149
 150         ocfs2_free_file_private(inode, file);
 151
 152         return 0;
 153 }
 154
 155 static int ocfs2_dir_open(struct inode *inode, struct file *file)
 156 {
 157         return ocfs2_init_file_private(inode, file);
 158 }
 159
 160 static int ocfs2_dir_release(struct inode *inode, struct file *file)
 161 {
 162         ocfs2_free_file_private(inode, file);
 163         return 0;
 164 }
 165
 166 static int ocfs2_sync_file(struct file *file, loff_t start, loff_t end,
 167                            int datasync)
 168 {
 169         int err = 0;
 170         struct inode *inode = file->f_mapping->host;
 171         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 172         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 173         journal_t *journal = osb->journal->j_journal;
 174         int ret;
 175         tid_t commit_tid;
 176         bool needs_barrier = false;
 177
 178         trace_ocfs2_sync_file(inode, file, file->f_path.dentry,
 179                               oi->ip_blkno,
 180                               file->f_path.dentry->d_name.len,
 181                               file->f_path.dentry->d_name.name,
 182                               (unsigned long long)datasync);
 183
 184         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 185                 return -EROFS;
 186
 187         err = file_write_and_wait_range(file, start, end);
 188         if (err)
 189                 return err;
 190
 191         commit_tid = datasync ? oi->i_datasync_tid : oi->i_sync_tid;
 192         if (journal->j_flags & JBD2_BARRIER &&
 193             !jbd2_trans_will_send_data_barrier(journal, commit_tid))
 194                 needs_barrier = true;
 195         err = jbd2_complete_transaction(journal, commit_tid);
 196         if (needs_barrier) {
 197                 ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
 198                 if (!err)
 199                         err = ret;
 200         }
 201
 202         if (err)
 203                 mlog_errno(err);
 204
 205         return (err < 0) ? -EIO : 0;
 206 }
 207
 208 int ocfs2_should_update_atime(struct inode *inode,
 209                               struct vfsmount *vfsmnt)
 210 {
 211         struct timespec64 now;
 212         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 213
 214         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 215                 return 0;
 216
 217         if ((inode->i_flags & S_NOATIME) ||
 218             ((inode->i_sb->s_flags & SB_NODIRATIME) && S_ISDIR(inode->i_mode)))
 219                 return 0;
 220
 221         /*
 222          * We can be called with no vfsmnt structure - NFSD will
 223          * sometimes do this.
 224          *
 225          * Note that our action here is different than touch_atime() -
 226          * if we can't tell whether this is a noatime mount, then we
 227          * don't know whether to trust the value of s_atime_quantum.
 228          */
 229         if (vfsmnt == NULL)
 230                 return 0;
 231
 232         if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
 233             ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 234                 return 0;
 235
 236         if (vfsmnt->mnt_flags & MNT_RELATIME) {
 237                 if ((timespec64_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
 238                     (timespec64_compare(&inode->i_atime, &inode->i_ctime) <= 0))
 239                         return 1;
 240
 241                 return 0;
 242         }
 243
 244         now = current_time(inode);
 245         if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
 246                 return 0;
 247         else
 248                 return 1;
 249 }
 250
 251 int ocfs2_update_inode_atime(struct inode *inode,
 252                              struct buffer_head *bh)
 253 {
 254         int ret;
 255         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 256         handle_t *handle;
 257         struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
 258
 259         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 260         if (IS_ERR(handle)) {
 261                 ret = PTR_ERR(handle);
 262                 mlog_errno(ret);
 263                 goto out;
 264         }
 265
 266         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 267                                       OCFS2_JOURNAL_ACCESS_WRITE);
 268         if (ret) {
 269                 mlog_errno(ret);
 270                 goto out_commit;
 271         }
 272
 273         /*
 274          * Don't use ocfs2_mark_inode_dirty() here as we don't always
 275          * have i_mutex to guard against concurrent changes to other
 276          * inode fields.
 277          */
 278         inode->i_atime = current_time(inode);
 279         di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 280         di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 281         ocfs2_update_inode_fsync_trans(handle, inode, 0);
 282         ocfs2_journal_dirty(handle, bh);
 283
 284 out_commit:
 285         ocfs2_commit_trans(osb, handle);
 286 out:
 287         return ret;
 288 }
 289
 290 int ocfs2_set_inode_size(handle_t *handle,
 291                                 struct inode *inode,
 292                                 struct buffer_head *fe_bh,
 293                                 u64 new_i_size)
 294 {
 295         int status;
 296
 297         i_size_write(inode, new_i_size);
 298         inode->i_blocks = ocfs2_inode_sector_count(inode);
 299         inode->i_ctime = inode->i_mtime = current_time(inode);
 300
 301         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 302         if (status < 0) {
 303                 mlog_errno(status);
 304                 goto bail;
 305         }
 306
 307 bail:
 308         return status;
 309 }
 310
 311 int ocfs2_simple_size_update(struct inode *inode,
 312                              struct buffer_head *di_bh,
 313                              u64 new_i_size)
 314 {
 315         int ret;
 316         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 317         handle_t *handle = NULL;
 318
 319         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 320         if (IS_ERR(handle)) {
 321                 ret = PTR_ERR(handle);
 322                 mlog_errno(ret);
 323                 goto out;
 324         }
 325
 326         ret = ocfs2_set_inode_size(handle, inode, di_bh,
 327                                    new_i_size);
 328         if (ret < 0)
 329                 mlog_errno(ret);
 330
 331         ocfs2_update_inode_fsync_trans(handle, inode, 0);
 332         ocfs2_commit_trans(osb, handle);
 333 out:
 334         return ret;
 335 }
 336
 337 static int ocfs2_cow_file_pos(struct inode *inode,
 338                               struct buffer_head *fe_bh,
 339                               u64 offset)
 340 {
 341         int status;
 342         u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 343         unsigned int num_clusters = 0;
 344         unsigned int ext_flags = 0;
 345
 346         /*
 347          * If the new offset is aligned to the range of the cluster, there is
 348          * no space for ocfs2_zero_range_for_truncate to fill, so no need to
 349          * CoW either.
 350          */
 351         if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
 352                 return 0;
 353
 354         status = ocfs2_get_clusters(inode, cpos, &phys,
 355                                     &num_clusters, &ext_flags);
 356         if (status) {
 357                 mlog_errno(status);
 358                 goto out;
 359         }
 360
 361         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
 362                 goto out;
 363
 364         return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1);
 365
 366 out:
 367         return status;
 368 }
 369
 370 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
 371                                      struct inode *inode,
 372                                      struct buffer_head *fe_bh,
 373                                      u64 new_i_size)
 374 {
 375         int status;
 376         handle_t *handle;
 377         struct ocfs2_dinode *di;
 378         u64 cluster_bytes;
 379
 380         /*
 381          * We need to CoW the cluster contains the offset if it is reflinked
 382          * since we will call ocfs2_zero_range_for_truncate later which will
 383          * write "0" from offset to the end of the cluster.
 384          */
 385         status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
 386         if (status) {
 387                 mlog_errno(status);
 388                 return status;
 389         }
 390
 391         /* TODO: This needs to actually orphan the inode in this
 392          * transaction. */
 393
 394         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 395         if (IS_ERR(handle)) {
 396                 status = PTR_ERR(handle);
 397                 mlog_errno(status);
 398                 goto out;
 399         }
 400
 401         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 402                                          OCFS2_JOURNAL_ACCESS_WRITE);
 403         if (status < 0) {
 404                 mlog_errno(status);
 405                 goto out_commit;
 406         }
 407
 408         /*
 409          * Do this before setting i_size.
 410          */
 411         cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
 412         status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
 413                                                cluster_bytes);
 414         if (status) {
 415                 mlog_errno(status);
 416                 goto out_commit;
 417         }
 418
 419         i_size_write(inode, new_i_size);
 420         inode->i_ctime = inode->i_mtime = current_time(inode);
 421
 422         di = (struct ocfs2_dinode *) fe_bh->b_data;
 423         di->i_size = cpu_to_le64(new_i_size);
 424         di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
 425         di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 426         ocfs2_update_inode_fsync_trans(handle, inode, 0);
 427
 428         ocfs2_journal_dirty(handle, fe_bh);
 429
 430 out_commit:
 431         ocfs2_commit_trans(osb, handle);
 432 out:
 433         return status;
 434 }
 435
 436 int ocfs2_truncate_file(struct inode *inode,
 437                                struct buffer_head *di_bh,
 438                                u64 new_i_size)
 439 {
 440         int status = 0;
 441         struct ocfs2_dinode *fe = NULL;
 442         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 443
 444         /* We trust di_bh because it comes from ocfs2_inode_lock(), which
 445          * already validated it */
 446         fe = (struct ocfs2_dinode *) di_bh->b_data;
 447
 448         trace_ocfs2_truncate_file((unsigned long long)OCFS2_I(inode)->ip_blkno,
 449                                   (unsigned long long)le64_to_cpu(fe->i_size),
 450                                   (unsigned long long)new_i_size);
 451
 452         mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
 453                         "Inode %llu, inode i_size = %lld != di "
 454                         "i_size = %llu, i_flags = 0x%x\n",
 455                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 456                         i_size_read(inode),
 457                         (unsigned long long)le64_to_cpu(fe->i_size),
 458                         le32_to_cpu(fe->i_flags));
 459
 460         if (new_i_size > le64_to_cpu(fe->i_size)) {
 461                 trace_ocfs2_truncate_file_error(
 462                         (unsigned long long)le64_to_cpu(fe->i_size),
 463                         (unsigned long long)new_i_size);
 464                 status = -EINVAL;
 465                 mlog_errno(status);
 466                 goto bail;
 467         }
 468
 469         down_write(&OCFS2_I(inode)->ip_alloc_sem);
 470
 471         ocfs2_resv_discard(&osb->osb_la_resmap,
 472                            &OCFS2_I(inode)->ip_la_data_resv);
 473
 474         /*
 475          * The inode lock forced other nodes to sync and drop their
 476          * pages, which (correctly) happens even if we have a truncate
 477          * without allocation change - ocfs2 cluster sizes can be much
 478          * greater than page size, so we have to truncate them
 479          * anyway.
 480          */
 481         unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
 482         truncate_inode_pages(inode->i_mapping, new_i_size);
 483
 484         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
 485                 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
 486                                                i_size_read(inode), 1);
 487                 if (status)
 488                         mlog_errno(status);
 489
 490                 goto bail_unlock_sem;
 491         }
 492
 493         /* alright, we're going to need to do a full blown alloc size
 494          * change. Orphan the inode so that recovery can complete the
 495          * truncate if necessary. This does the task of marking
 496          * i_size. */
 497         status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
 498         if (status < 0) {
 499                 mlog_errno(status);
 500                 goto bail_unlock_sem;
 501         }
 502
 503         status = ocfs2_commit_truncate(osb, inode, di_bh);
 504         if (status < 0) {
 505                 mlog_errno(status);
 506                 goto bail_unlock_sem;
 507         }
 508
 509         /* TODO: orphan dir cleanup here. */
 510 bail_unlock_sem:
 511         up_write(&OCFS2_I(inode)->ip_alloc_sem);
 512
 513 bail:
 514         if (!status && OCFS2_I(inode)->ip_clusters == 0)
 515                 status = ocfs2_try_remove_refcount_tree(inode, di_bh);
 516
 517         return status;
 518 }
 519
 520 /*
 521  * extend file allocation only here.
 522  * we'll update all the disk stuff, and oip->alloc_size
 523  *
 524  * expect stuff to be locked, a transaction started and enough data /
 525  * metadata reservations in the contexts.
 526  *
 527  * Will return -EAGAIN, and a reason if a restart is needed.
 528  * If passed in, *reason will always be set, even in error.
 529  */
 530 int ocfs2_add_inode_data(struct ocfs2_super *osb,
 531                          struct inode *inode,
 532                          u32 *logical_offset,
 533                          u32 clusters_to_add,
 534                          int mark_unwritten,
 535                          struct buffer_head *fe_bh,
 536                          handle_t *handle,
 537                          struct ocfs2_alloc_context *data_ac,
 538                          struct ocfs2_alloc_context *meta_ac,
 539                          enum ocfs2_alloc_restarted *reason_ret)
 540 {
 541         int ret;
 542         struct ocfs2_extent_tree et;
 543
 544         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
 545         ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
 546                                           clusters_to_add, mark_unwritten,
 547                                           data_ac, meta_ac, reason_ret);
 548
 549         return ret;
 550 }
 551
 552 static int ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
 553                                    u32 clusters_to_add, int mark_unwritten)
 554 {
 555         int status = 0;
 556         int restart_func = 0;
 557         int credits;
 558         u32 prev_clusters;
 559         struct buffer_head *bh = NULL;
 560         struct ocfs2_dinode *fe = NULL;
 561         handle_t *handle = NULL;
 562         struct ocfs2_alloc_context *data_ac = NULL;
 563         struct ocfs2_alloc_context *meta_ac = NULL;
 564         enum ocfs2_alloc_restarted why = RESTART_NONE;
 565         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 566         struct ocfs2_extent_tree et;
 567         int did_quota = 0;
 568
 569         /*
 570          * Unwritten extent only exists for file systems which
 571          * support holes.
 572          */
 573         BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
 574
 575         status = ocfs2_read_inode_block(inode, &bh);
 576         if (status < 0) {
 577                 mlog_errno(status);
 578                 goto leave;
 579         }
 580         fe = (struct ocfs2_dinode *) bh->b_data;
 581
 582 restart_all:
 583         BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
 584
 585         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
 586         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 587                                        &data_ac, &meta_ac);
 588         if (status) {
 589                 mlog_errno(status);
 590                 goto leave;
 591         }
 592
 593         credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list);
 594         handle = ocfs2_start_trans(osb, credits);
 595         if (IS_ERR(handle)) {
 596                 status = PTR_ERR(handle);
 597                 handle = NULL;
 598                 mlog_errno(status);
 599                 goto leave;
 600         }
 601
 602 restarted_transaction:
 603         trace_ocfs2_extend_allocation(
 604                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
 605                 (unsigned long long)i_size_read(inode),
 606                 le32_to_cpu(fe->i_clusters), clusters_to_add,
 607                 why, restart_func);
 608
 609         status = dquot_alloc_space_nodirty(inode,
 610                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 611         if (status)
 612                 goto leave;
 613         did_quota = 1;
 614
 615         /* reserve a write to the file entry early on - that we if we
 616          * run out of credits in the allocation path, we can still
 617          * update i_size. */
 618         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 619                                          OCFS2_JOURNAL_ACCESS_WRITE);
 620         if (status < 0) {
 621                 mlog_errno(status);
 622                 goto leave;
 623         }
 624
 625         prev_clusters = OCFS2_I(inode)->ip_clusters;
 626
 627         status = ocfs2_add_inode_data(osb,
 628                                       inode,
 629                                       &logical_start,
 630                                       clusters_to_add,
 631                                       mark_unwritten,
 632                                       bh,
 633                                       handle,
 634                                       data_ac,
 635                                       meta_ac,
 636                                       &why);
 637         if ((status < 0) && (status != -EAGAIN)) {
 638                 if (status != -ENOSPC)
 639                         mlog_errno(status);
 640                 goto leave;
 641         }
 642         ocfs2_update_inode_fsync_trans(handle, inode, 1);
 643         ocfs2_journal_dirty(handle, bh);
 644
 645         spin_lock(&OCFS2_I(inode)->ip_lock);
 646         clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
 647         spin_unlock(&OCFS2_I(inode)->ip_lock);
 648         /* Release unused quota reservation */
 649         dquot_free_space(inode,
 650                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 651         did_quota = 0;
 652
 653         if (why != RESTART_NONE && clusters_to_add) {
 654                 if (why == RESTART_META) {
 655                         restart_func = 1;
 656                         status = 0;
 657                 } else {
 658                         BUG_ON(why != RESTART_TRANS);
 659
 660                         status = ocfs2_allocate_extend_trans(handle, 1);
 661                         if (status < 0) {
 662                                 /* handle still has to be committed at
 663                                  * this point. */
 664                                 status = -ENOMEM;
 665                                 mlog_errno(status);
 666                                 goto leave;
 667                         }
 668                         goto restarted_transaction;
 669                 }
 670         }
 671
 672         trace_ocfs2_extend_allocation_end(OCFS2_I(inode)->ip_blkno,
 673              le32_to_cpu(fe->i_clusters),
 674              (unsigned long long)le64_to_cpu(fe->i_size),
 675              OCFS2_I(inode)->ip_clusters,
 676              (unsigned long long)i_size_read(inode));
 677
 678 leave:
 679         if (status < 0 && did_quota)
 680                 dquot_free_space(inode,
 681                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 682         if (handle) {
 683                 ocfs2_commit_trans(osb, handle);
 684                 handle = NULL;
 685         }
 686         if (data_ac) {
 687                 ocfs2_free_alloc_context(data_ac);
 688                 data_ac = NULL;
 689         }
 690         if (meta_ac) {
 691                 ocfs2_free_alloc_context(meta_ac);
 692                 meta_ac = NULL;
 693         }
 694         if ((!status) && restart_func) {
 695                 restart_func = 0;
 696                 goto restart_all;
 697         }
 698         brelse(bh);
 699         bh = NULL;
 700
 701         return status;
 702 }
 703
 704 /*
 705  * While a write will already be ordering the data, a truncate will not.
 706  * Thus, we need to explicitly order the zeroed pages.
 707  */
 708 static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode,
 709                                                       struct buffer_head *di_bh,
 710                                                       loff_t start_byte,
 711                                                       loff_t length)
 712 {
 713         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 714         handle_t *handle = NULL;
 715         int ret = 0;
 716
 717         if (!ocfs2_should_order_data(inode))
 718                 goto out;
 719
 720         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 721         if (IS_ERR(handle)) {
 722                 ret = -ENOMEM;
 723                 mlog_errno(ret);
 724                 goto out;
 725         }
 726
 727         ret = ocfs2_jbd2_inode_add_write(handle, inode, start_byte, length);
 728         if (ret < 0) {
 729                 mlog_errno(ret);
 730                 goto out;
 731         }
 732
 733         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
 734                                       OCFS2_JOURNAL_ACCESS_WRITE);
 735         if (ret)
 736                 mlog_errno(ret);
 737         ocfs2_update_inode_fsync_trans(handle, inode, 1);
 738
 739 out:
 740         if (ret) {
 741                 if (!IS_ERR(handle))
 742                         ocfs2_commit_trans(osb, handle);
 743                 handle = ERR_PTR(ret);
 744         }
 745         return handle;
 746 }
 747
 748 /* Some parts of this taken from generic_cont_expand, which turned out
 749  * to be too fragile to do exactly what we need without us having to
 750  * worry about recursive locking in ->write_begin() and ->write_end(). */
 751 static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
 752                                  u64 abs_to, struct buffer_head *di_bh)
 753 {
 754         struct address_space *mapping = inode->i_mapping;
 755         struct page *page;
 756         unsigned long index = abs_from >> PAGE_SHIFT;
 757         handle_t *handle;
 758         int ret = 0;
 759         unsigned zero_from, zero_to, block_start, block_end;
 760         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
 761
 762         BUG_ON(abs_from >= abs_to);
 763         BUG_ON(abs_to > (((u64)index + 1) << PAGE_SHIFT));
 764         BUG_ON(abs_from & (inode->i_blkbits - 1));
 765
 766         handle = ocfs2_zero_start_ordered_transaction(inode, di_bh,
 767                                                       abs_from,
 768                                                       abs_to - abs_from);
 769         if (IS_ERR(handle)) {
 770                 ret = PTR_ERR(handle);
 771                 goto out;
 772         }
 773
 774         page = find_or_create_page(mapping, index, GFP_NOFS);
 775         if (!page) {
 776                 ret = -ENOMEM;
 777                 mlog_errno(ret);
 778                 goto out_commit_trans;
 779         }
 780
 781         /* Get the offsets within the page that we want to zero */
 782         zero_from = abs_from & (PAGE_SIZE - 1);
 783         zero_to = abs_to & (PAGE_SIZE - 1);
 784         if (!zero_to)
 785                 zero_to = PAGE_SIZE;
 786
 787         trace_ocfs2_write_zero_page(
 788                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 789                         (unsigned long long)abs_from,
 790                         (unsigned long long)abs_to,
 791                         index, zero_from, zero_to);
 792
 793         /* We know that zero_from is block aligned */
 794         for (block_start = zero_from; block_start < zero_to;
 795              block_start = block_end) {
 796                 block_end = block_start + i_blocksize(inode);
 797
 798                 /*
 799                  * block_start is block-aligned.  Bump it by one to force
 800                  * __block_write_begin and block_commit_write to zero the
 801                  * whole block.
 802                  */
 803                 ret = __block_write_begin(page, block_start + 1, 0,
 804                                           ocfs2_get_block);
 805                 if (ret < 0) {
 806                         mlog_errno(ret);
 807                         goto out_unlock;
 808                 }
 809
 810
 811                 /* must not update i_size! */
 812                 ret = block_commit_write(page, block_start + 1,
 813                                          block_start + 1);
 814                 if (ret < 0)
 815                         mlog_errno(ret);
 816                 else
 817                         ret = 0;
 818         }
 819
 820         /*
 821          * fs-writeback will release the dirty pages without page lock
 822          * whose offset are over inode size, the release happens at
 823          * block_write_full_page().
 824          */
 825         i_size_write(inode, abs_to);
 826         inode->i_blocks = ocfs2_inode_sector_count(inode);
 827         di->i_size = cpu_to_le64((u64)i_size_read(inode));
 828         inode->i_mtime = inode->i_ctime = current_time(inode);
 829         di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
 830         di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 831         di->i_mtime_nsec = di->i_ctime_nsec;
 832         if (handle) {
 833                 ocfs2_journal_dirty(handle, di_bh);
 834                 ocfs2_update_inode_fsync_trans(handle, inode, 1);
 835         }
 836
 837 out_unlock:
 838         unlock_page(page);
 839         put_page(page);
 840 out_commit_trans:
 841         if (handle)
 842                 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 843 out:
 844         return ret;
 845 }
 846
 847 /*
 848  * Find the next range to zero.  We do this in terms of bytes because
 849  * that's what ocfs2_zero_extend() wants, and it is dealing with the
 850  * pagecache.  We may return multiple extents.
 851  *
 852  * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
 853  * needs to be zeroed.  range_start and range_end return the next zeroing
 854  * range.  A subsequent call should pass the previous range_end as its
 855  * zero_start.  If range_end is 0, there's nothing to do.
 856  *
 857  * Unwritten extents are skipped over.  Refcounted extents are CoWd.
 858  */
 859 static int ocfs2_zero_extend_get_range(struct inode *inode,
 860                                        struct buffer_head *di_bh,
 861                                        u64 zero_start, u64 zero_end,
 862                                        u64 *range_start, u64 *range_end)
 863 {
 864         int rc = 0, needs_cow = 0;
 865         u32 p_cpos, zero_clusters = 0;
 866         u32 zero_cpos =
 867                 zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 868         u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
 869         unsigned int num_clusters = 0;
 870         unsigned int ext_flags = 0;
 871
 872         while (zero_cpos < last_cpos) {
 873                 rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
 874                                         &num_clusters, &ext_flags);
 875                 if (rc) {
 876                         mlog_errno(rc);
 877                         goto out;
 878                 }
 879
 880                 if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
 881                         zero_clusters = num_clusters;
 882                         if (ext_flags & OCFS2_EXT_REFCOUNTED)
 883                                 needs_cow = 1;
 884                         break;
 885                 }
 886
 887                 zero_cpos += num_clusters;
 888         }
 889         if (!zero_clusters) {
 890                 *range_end = 0;
 891                 goto out;
 892         }
 893
 894         while ((zero_cpos + zero_clusters) < last_cpos) {
 895                 rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
 896                                         &p_cpos, &num_clusters,
 897                                         &ext_flags);
 898                 if (rc) {
 899                         mlog_errno(rc);
 900                         goto out;
 901                 }
 902
 903                 if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
 904                         break;
 905                 if (ext_flags & OCFS2_EXT_REFCOUNTED)
 906                         needs_cow = 1;
 907                 zero_clusters += num_clusters;
 908         }
 909         if ((zero_cpos + zero_clusters) > last_cpos)
 910                 zero_clusters = last_cpos - zero_cpos;
 911
 912         if (needs_cow) {
 913                 rc = ocfs2_refcount_cow(inode, di_bh, zero_cpos,
 914                                         zero_clusters, UINT_MAX);
 915                 if (rc) {
 916                         mlog_errno(rc);
 917                         goto out;
 918                 }
 919         }
 920
 921         *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
 922         *range_end = ocfs2_clusters_to_bytes(inode->i_sb,
 923                                              zero_cpos + zero_clusters);
 924
 925 out:
 926         return rc;
 927 }
 928
 929 /*
 930  * Zero one range returned from ocfs2_zero_extend_get_range().  The caller
 931  * has made sure that the entire range needs zeroing.
 932  */
 933 static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
 934                                    u64 range_end, struct buffer_head *di_bh)
 935 {
 936         int rc = 0;
 937         u64 next_pos;
 938         u64 zero_pos = range_start;
 939
 940         trace_ocfs2_zero_extend_range(
 941                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 942                         (unsigned long long)range_start,
 943                         (unsigned long long)range_end);
 944         BUG_ON(range_start >= range_end);
 945
 946         while (zero_pos < range_end) {
 947                 next_pos = (zero_pos & PAGE_MASK) + PAGE_SIZE;
 948                 if (next_pos > range_end)
 949                         next_pos = range_end;
 950                 rc = ocfs2_write_zero_page(inode, zero_pos, next_pos, di_bh);
 951                 if (rc < 0) {
 952                         mlog_errno(rc);
 953                         break;
 954                 }
 955                 zero_pos = next_pos;
 956
 957                 /*
 958                  * Very large extends have the potential to lock up
 959                  * the cpu for extended periods of time.
 960                  */
 961                 cond_resched();
 962         }
 963
 964         return rc;
 965 }
 966
 967 int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
 968                       loff_t zero_to_size)
 969 {
 970         int ret = 0;
 971         u64 zero_start, range_start = 0, range_end = 0;
 972         struct super_block *sb = inode->i_sb;
 973
 974         zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
 975         trace_ocfs2_zero_extend((unsigned long long)OCFS2_I(inode)->ip_blkno,
 976                                 (unsigned long long)zero_start,
 977                                 (unsigned long long)i_size_read(inode));
 978         while (zero_start < zero_to_size) {
 979                 ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
 980                                                   zero_to_size,
 981                                                   &range_start,
 982                                                   &range_end);
 983                 if (ret) {
 984                         mlog_errno(ret);
 985                         break;
 986                 }
 987                 if (!range_end)
 988                         break;
 989                 /* Trim the ends */
 990                 if (range_start < zero_start)
 991                         range_start = zero_start;
 992                 if (range_end > zero_to_size)
 993                         range_end = zero_to_size;
 994
 995                 ret = ocfs2_zero_extend_range(inode, range_start,
 996                                               range_end, di_bh);
 997                 if (ret) {
 998                         mlog_errno(ret);
 999                         break;
1000                 }
1001                 zero_start = range_end;
1002         }
1003
1004         return ret;
1005 }
1006
1007 int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
1008                           u64 new_i_size, u64 zero_to)
1009 {
1010         int ret;
1011         u32 clusters_to_add;
1012         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1013
1014         /*
1015          * Only quota files call this without a bh, and they can't be
1016          * refcounted.
1017          */
1018         BUG_ON(!di_bh && ocfs2_is_refcount_inode(inode));
1019         BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
1020
1021         clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
1022         if (clusters_to_add < oi->ip_clusters)
1023                 clusters_to_add = 0;
1024         else
1025                 clusters_to_add -= oi->ip_clusters;
1026
1027         if (clusters_to_add) {
1028                 ret = ocfs2_extend_allocation(inode, oi->ip_clusters,
1029                                               clusters_to_add, 0);
1030                 if (ret) {
1031                         mlog_errno(ret);
1032                         goto out;
1033                 }
1034         }
1035
1036         /*
1037          * Call this even if we don't add any clusters to the tree. We
1038          * still need to zero the area between the old i_size and the
1039          * new i_size.
1040          */
1041         ret = ocfs2_zero_extend(inode, di_bh, zero_to);
1042         if (ret < 0)
1043                 mlog_errno(ret);
1044
1045 out:
1046         return ret;
1047 }
1048
1049 static int ocfs2_extend_file(struct inode *inode,
1050                              struct buffer_head *di_bh,
1051                              u64 new_i_size)
1052 {
1053         int ret = 0;
1054         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1055
1056         BUG_ON(!di_bh);
1057
1058         /* setattr sometimes calls us like this. */
1059         if (new_i_size == 0)
1060                 goto out;
1061
1062         if (i_size_read(inode) == new_i_size)
1063                 goto out;
1064         BUG_ON(new_i_size < i_size_read(inode));
1065
1066         /*
1067          * The alloc sem blocks people in read/write from reading our
1068          * allocation until we're done changing it. We depend on
1069          * i_mutex to block other extend/truncate calls while we're
1070          * here.  We even have to hold it for sparse files because there
1071          * might be some tail zeroing.
1072          */
1073         down_write(&oi->ip_alloc_sem);
1074
1075         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1076                 /*
1077                  * We can optimize small extends by keeping the inodes
1078                  * inline data.
1079                  */
1080                 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1081                         up_write(&oi->ip_alloc_sem);
1082                         goto out_update_size;
1083                 }
1084
1085                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1086                 if (ret) {
1087                         up_write(&oi->ip_alloc_sem);
1088                         mlog_errno(ret);
1089                         goto out;
1090                 }
1091         }
1092
1093         if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1094                 ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1095         else
1096                 ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1097                                             new_i_size);
1098
1099         up_write(&oi->ip_alloc_sem);
1100
1101         if (ret < 0) {
1102                 mlog_errno(ret);
1103                 goto out;
1104         }
1105
1106 out_update_size:
1107         ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1108         if (ret < 0)
1109                 mlog_errno(ret);
1110
1111 out:
1112         return ret;
1113 }
1114
1115 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1116 {
1117         int status = 0, size_change;
1118         int inode_locked = 0;
1119         struct inode *inode = d_inode(dentry);
1120         struct super_block *sb = inode->i_sb;
1121         struct ocfs2_super *osb = OCFS2_SB(sb);
1122         struct buffer_head *bh = NULL;
1123         handle_t *handle = NULL;
1124         struct dquot *transfer_to[MAXQUOTAS] = { };
1125         int qtype;
1126         int had_lock;
1127         struct ocfs2_lock_holder oh;
1128
1129         trace_ocfs2_setattr(inode, dentry,
1130                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
1131                             dentry->d_name.len, dentry->d_name.name,
1132                             attr->ia_valid, attr->ia_mode,
1133                             from_kuid(&init_user_ns, attr->ia_uid),
1134                             from_kgid(&init_user_ns, attr->ia_gid));
1135
1136         /* ensuring we don't even attempt to truncate a symlink */
1137         if (S_ISLNK(inode->i_mode))
1138                 attr->ia_valid &= ~ATTR_SIZE;
1139
1140 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1141                            | ATTR_GID | ATTR_UID | ATTR_MODE)
1142         if (!(attr->ia_valid & OCFS2_VALID_ATTRS))
1143                 return 0;
1144
1145         status = setattr_prepare(dentry, attr);
1146         if (status)
1147                 return status;
1148
1149         if (is_quota_modification(inode, attr)) {
1150                 status = dquot_initialize(inode);
1151                 if (status)
1152                         return status;
1153         }
1154         size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1155         if (size_change) {
1156                 /*
1157                  * Here we should wait dio to finish before inode lock
1158                  * to avoid a deadlock between ocfs2_setattr() and
1159                  * ocfs2_dio_end_io_write()
1160                  */
1161                 inode_dio_wait(inode);
1162
1163                 status = ocfs2_rw_lock(inode, 1);
1164                 if (status < 0) {
1165                         mlog_errno(status);
1166                         goto bail;
1167                 }
1168         }
1169
1170         had_lock = ocfs2_inode_lock_tracker(inode, &bh, 1, &oh);
1171         if (had_lock < 0) {
1172                 status = had_lock;
1173                 goto bail_unlock_rw;
1174         } else if (had_lock) {
1175                 /*
1176                  * As far as we know, ocfs2_setattr() could only be the first
1177                  * VFS entry point in the call chain of recursive cluster
1178                  * locking issue.
1179                  *
1180                  * For instance:
1181                  * chmod_common()
1182                  *  notify_change()
1183                  *   ocfs2_setattr()
1184                  *    posix_acl_chmod()
1185                  *     ocfs2_iop_get_acl()
1186                  *
1187                  * But, we're not 100% sure if it's always true, because the
1188                  * ordering of the VFS entry points in the call chain is out
1189                  * of our control. So, we'd better dump the stack here to
1190                  * catch the other cases of recursive locking.
1191                  */
1192                 mlog(ML_ERROR, "Another case of recursive locking:\n");
1193                 dump_stack();
1194         }
1195         inode_locked = 1;
1196
1197         if (size_change) {
1198                 status = inode_newsize_ok(inode, attr->ia_size);
1199                 if (status)
1200                         goto bail_unlock;
1201
1202                 if (i_size_read(inode) >= attr->ia_size) {
1203                         if (ocfs2_should_order_data(inode)) {
1204                                 status = ocfs2_begin_ordered_truncate(inode,
1205                                                                       attr->ia_size);
1206                                 if (status)
1207                                         goto bail_unlock;
1208                         }
1209                         status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1210                 } else
1211                         status = ocfs2_extend_file(inode, bh, attr->ia_size);
1212                 if (status < 0) {
1213                         if (status != -ENOSPC)
1214                                 mlog_errno(status);
1215                         status = -ENOSPC;
1216                         goto bail_unlock;
1217                 }
1218         }
1219
1220         if ((attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
1221             (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
1222                 /*
1223                  * Gather pointers to quota structures so that allocation /
1224                  * freeing of quota structures happens here and not inside
1225                  * dquot_transfer() where we have problems with lock ordering
1226                  */
1227                 if (attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)
1228                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1229                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1230                         transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(attr->ia_uid));
1231                         if (IS_ERR(transfer_to[USRQUOTA])) {
1232                                 status = PTR_ERR(transfer_to[USRQUOTA]);
1233                                 goto bail_unlock;
1234                         }
1235                 }
1236                 if (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid)
1237                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1238                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1239                         transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(attr->ia_gid));
1240                         if (IS_ERR(transfer_to[GRPQUOTA])) {
1241                                 status = PTR_ERR(transfer_to[GRPQUOTA]);
1242                                 goto bail_unlock;
1243                         }
1244                 }
1245                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1246                                            2 * ocfs2_quota_trans_credits(sb));
1247                 if (IS_ERR(handle)) {
1248                         status = PTR_ERR(handle);
1249                         mlog_errno(status);
1250                         goto bail_unlock;
1251                 }
1252                 status = __dquot_transfer(inode, transfer_to);
1253                 if (status < 0)
1254                         goto bail_commit;
1255         } else {
1256                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1257                 if (IS_ERR(handle)) {
1258                         status = PTR_ERR(handle);
1259                         mlog_errno(status);
1260                         goto bail_unlock;
1261                 }
1262         }
1263
1264         setattr_copy(inode, attr);
1265         mark_inode_dirty(inode);
1266
1267         status = ocfs2_mark_inode_dirty(handle, inode, bh);
1268         if (status < 0)
1269                 mlog_errno(status);
1270
1271 bail_commit:
1272         ocfs2_commit_trans(osb, handle);
1273 bail_unlock:
1274         if (status && inode_locked) {
1275                 ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
1276                 inode_locked = 0;
1277         }
1278 bail_unlock_rw:
1279         if (size_change)
1280                 ocfs2_rw_unlock(inode, 1);
1281 bail:
1282
1283         /* Release quota pointers in case we acquired them */
1284         for (qtype = 0; qtype < OCFS2_MAXQUOTAS; qtype++)
1285                 dqput(transfer_to[qtype]);
1286
1287         if (!status && attr->ia_valid & ATTR_MODE) {
1288                 status = ocfs2_acl_chmod(inode, bh);
1289                 if (status < 0)
1290                         mlog_errno(status);
1291         }
1292         if (inode_locked)
1293                 ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
1294
1295         brelse(bh);
1296         return status;
1297 }
1298
1299 int ocfs2_getattr(const struct path *path, struct kstat *stat,
1300                   u32 request_mask, unsigned int flags)
1301 {
1302         struct inode *inode = d_inode(path->dentry);
1303         struct super_block *sb = path->dentry->d_sb;
1304         struct ocfs2_super *osb = sb->s_fs_info;
1305         int err;
1306
1307         err = ocfs2_inode_revalidate(path->dentry);
1308         if (err) {
1309                 if (err != -ENOENT)
1310                         mlog_errno(err);
1311                 goto bail;
1312         }
1313
1314         generic_fillattr(inode, stat);
1315         /*
1316          * If there is inline data in the inode, the inode will normally not
1317          * have data blocks allocated (it may have an external xattr block).
1318          * Report at least one sector for such files, so tools like tar, rsync,
1319          * others don't incorrectly think the file is completely sparse.
1320          */
1321         if (unlikely(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1322                 stat->blocks += (stat->size + 511)>>9;
1323
1324         /* We set the blksize from the cluster size for performance */
1325         stat->blksize = osb->s_clustersize;
1326
1327 bail:
1328         return err;
1329 }
1330
1331 int ocfs2_permission(struct inode *inode, int mask)
1332 {
1333         int ret, had_lock;
1334         struct ocfs2_lock_holder oh;
1335
1336         if (mask & MAY_NOT_BLOCK)
1337                 return -ECHILD;
1338
1339         had_lock = ocfs2_inode_lock_tracker(inode, NULL, 0, &oh);
1340         if (had_lock < 0) {
1341                 ret = had_lock;
1342                 goto out;
1343         } else if (had_lock) {
1344                 /* See comments in ocfs2_setattr() for details.
1345                  * The call chain of this case could be:
1346                  * do_sys_open()
1347                  *  may_open()
1348                  *   inode_permission()
1349                  *    ocfs2_permission()
1350                  *     ocfs2_iop_get_acl()
1351                  */
1352                 mlog(ML_ERROR, "Another case of recursive locking:\n");
1353                 dump_stack();
1354         }
1355
1356         ret = generic_permission(inode, mask);
1357
1358         ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock);
1359 out:
1360         return ret;
1361 }
1362
1363 static int __ocfs2_write_remove_suid(struct inode *inode,
1364                                      struct buffer_head *bh)
1365 {
1366         int ret;
1367         handle_t *handle;
1368         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1369         struct ocfs2_dinode *di;
1370
1371         trace_ocfs2_write_remove_suid(
1372                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1373                         inode->i_mode);
1374
1375         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1376         if (IS_ERR(handle)) {
1377                 ret = PTR_ERR(handle);
1378                 mlog_errno(ret);
1379                 goto out;
1380         }
1381
1382         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1383                                       OCFS2_JOURNAL_ACCESS_WRITE);
1384         if (ret < 0) {
1385                 mlog_errno(ret);
1386                 goto out_trans;
1387         }
1388
1389         inode->i_mode &= ~S_ISUID;
1390         if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1391                 inode->i_mode &= ~S_ISGID;
1392
1393         di = (struct ocfs2_dinode *) bh->b_data;
1394         di->i_mode = cpu_to_le16(inode->i_mode);
1395         ocfs2_update_inode_fsync_trans(handle, inode, 0);
1396
1397         ocfs2_journal_dirty(handle, bh);
1398
1399 out_trans:
1400         ocfs2_commit_trans(osb, handle);
1401 out:
1402         return ret;
1403 }
1404
1405 static int ocfs2_write_remove_suid(struct inode *inode)
1406 {
1407         int ret;
1408         struct buffer_head *bh = NULL;
1409
1410         ret = ocfs2_read_inode_block(inode, &bh);
1411         if (ret < 0) {
1412                 mlog_errno(ret);
1413                 goto out;
1414         }
1415
1416         ret =  __ocfs2_write_remove_suid(inode, bh);
1417 out:
1418         brelse(bh);
1419         return ret;
1420 }
1421
1422 /*
1423  * Allocate enough extents to cover the region starting at byte offset
1424  * start for len bytes. Existing extents are skipped, any extents
1425  * added are marked as "unwritten".
1426  */
1427 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1428                                             u64 start, u64 len)
1429 {
1430         int ret;
1431         u32 cpos, phys_cpos, clusters, alloc_size;
1432         u64 end = start + len;
1433         struct buffer_head *di_bh = NULL;
1434
1435         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1436                 ret = ocfs2_read_inode_block(inode, &di_bh);
1437                 if (ret) {
1438                         mlog_errno(ret);
1439                         goto out;
1440                 }
1441
1442                 /*
1443                  * Nothing to do if the requested reservation range
1444                  * fits within the inode.
1445                  */
1446                 if (ocfs2_size_fits_inline_data(di_bh, end))
1447                         goto out;
1448
1449                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1450                 if (ret) {
1451                         mlog_errno(ret);
1452                         goto out;
1453                 }
1454         }
1455
1456         /*
1457          * We consider both start and len to be inclusive.
1458          */
1459         cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1460         clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1461         clusters -= cpos;
1462
1463         while (clusters) {
1464                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1465                                          &alloc_size, NULL);
1466                 if (ret) {
1467                         mlog_errno(ret);
1468                         goto out;
1469                 }
1470
1471                 /*
1472                  * Hole or existing extent len can be arbitrary, so
1473                  * cap it to our own allocation request.
1474                  */
1475                 if (alloc_size > clusters)
1476                         alloc_size = clusters;
1477
1478                 if (phys_cpos) {
1479                         /*
1480                          * We already have an allocation at this
1481                          * region so we can safely skip it.
1482                          */
1483                         goto next;
1484                 }
1485
1486                 ret = ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1487                 if (ret) {
1488                         if (ret != -ENOSPC)
1489                                 mlog_errno(ret);
1490                         goto out;
1491                 }
1492
1493 next:
1494                 cpos += alloc_size;
1495                 clusters -= alloc_size;
1496         }
1497
1498         ret = 0;
1499 out:
1500
1501         brelse(di_bh);
1502         return ret;
1503 }
1504
1505 /*
1506  * Truncate a byte range, avoiding pages within partial clusters. This
1507  * preserves those pages for the zeroing code to write to.
1508  */
1509 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1510                                          u64 byte_len)
1511 {
1512         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1513         loff_t start, end;
1514         struct address_space *mapping = inode->i_mapping;
1515
1516         start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1517         end = byte_start + byte_len;
1518         end = end & ~(osb->s_clustersize - 1);
1519
1520         if (start < end) {
1521                 unmap_mapping_range(mapping, start, end - start, 0);
1522                 truncate_inode_pages_range(mapping, start, end - 1);
1523         }
1524 }
1525
1526 static int ocfs2_zero_partial_clusters(struct inode *inode,
1527                                        u64 start, u64 len)
1528 {
1529         int ret = 0;
1530         u64 tmpend = 0;
1531         u64 end = start + len;
1532         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1533         unsigned int csize = osb->s_clustersize;
1534         handle_t *handle;
1535
1536         /*
1537          * The "start" and "end" values are NOT necessarily part of
1538          * the range whose allocation is being deleted. Rather, this
1539          * is what the user passed in with the request. We must zero
1540          * partial clusters here. There's no need to worry about
1541          * physical allocation - the zeroing code knows to skip holes.
1542          */
1543         trace_ocfs2_zero_partial_clusters(
1544                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1545                 (unsigned long long)start, (unsigned long long)end);
1546
1547         /*
1548          * If both edges are on a cluster boundary then there's no
1549          * zeroing required as the region is part of the allocation to
1550          * be truncated.
1551          */
1552         if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1553                 goto out;
1554
1555         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1556         if (IS_ERR(handle)) {
1557                 ret = PTR_ERR(handle);
1558                 mlog_errno(ret);
1559                 goto out;
1560         }
1561
1562         /*
1563          * If start is on a cluster boundary and end is somewhere in another
1564          * cluster, we have not COWed the cluster starting at start, unless
1565          * end is also within the same cluster. So, in this case, we skip this
1566          * first call to ocfs2_zero_range_for_truncate() truncate and move on
1567          * to the next one.
1568          */
1569         if ((start & (csize - 1)) != 0) {
1570                 /*
1571                  * We want to get the byte offset of the end of the 1st
1572                  * cluster.
1573                  */
1574                 tmpend = (u64)osb->s_clustersize +
1575                         (start & ~(osb->s_clustersize - 1));
1576                 if (tmpend > end)
1577                         tmpend = end;
1578
1579                 trace_ocfs2_zero_partial_clusters_range1(
1580                         (unsigned long long)start,
1581                         (unsigned long long)tmpend);
1582
1583                 ret = ocfs2_zero_range_for_truncate(inode, handle, start,
1584                                                     tmpend);
1585                 if (ret)
1586                         mlog_errno(ret);
1587         }
1588
1589         if (tmpend < end) {
1590                 /*
1591                  * This may make start and end equal, but the zeroing
1592                  * code will skip any work in that case so there's no
1593                  * need to catch it up here.
1594                  */
1595                 start = end & ~(osb->s_clustersize - 1);
1596
1597                 trace_ocfs2_zero_partial_clusters_range2(
1598                         (unsigned long long)start, (unsigned long long)end);
1599
1600                 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1601                 if (ret)
1602                         mlog_errno(ret);
1603         }
1604         ocfs2_update_inode_fsync_trans(handle, inode, 1);
1605
1606         ocfs2_commit_trans(osb, handle);
1607 out:
1608         return ret;
1609 }
1610
1611 static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1612 {
1613         int i;
1614         struct ocfs2_extent_rec *rec = NULL;
1615
1616         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1617
1618                 rec = &el->l_recs[i];
1619
1620                 if (le32_to_cpu(rec->e_cpos) < pos)
1621                         break;
1622         }
1623
1624         return i;
1625 }
1626
1627 /*
1628  * Helper to calculate the punching pos and length in one run, we handle the
1629  * following three cases in order:
1630  *
1631  * - remove the entire record
1632  * - remove a partial record
1633  * - no record needs to be removed (hole-punching completed)
1634 */
1635 static void ocfs2_calc_trunc_pos(struct inode *inode,
1636                                  struct ocfs2_extent_list *el,
1637                                  struct ocfs2_extent_rec *rec,
1638                                  u32 trunc_start, u32 *trunc_cpos,
1639                                  u32 *trunc_len, u32 *trunc_end,
1640                                  u64 *blkno, int *done)
1641 {
1642         int ret = 0;
1643         u32 coff, range;
1644
1645         range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1646
1647         if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1648                 /*
1649                  * remove an entire extent record.
1650                  */
1651                 *trunc_cpos = le32_to_cpu(rec->e_cpos);
1652                 /*
1653                  * Skip holes if any.
1654                  */
1655                 if (range < *trunc_end)
1656                         *trunc_end = range;
1657                 *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1658                 *blkno = le64_to_cpu(rec->e_blkno);
1659                 *trunc_end = le32_to_cpu(rec->e_cpos);
1660         } else if (range > trunc_start) {
1661                 /*
1662                  * remove a partial extent record, which means we're
1663                  * removing the last extent record.
1664                  */
1665                 *trunc_cpos = trunc_start;
1666                 /*
1667                  * skip hole if any.
1668                  */
1669                 if (range < *trunc_end)
1670                         *trunc_end = range;
1671                 *trunc_len = *trunc_end - trunc_start;
1672                 coff = trunc_start - le32_to_cpu(rec->e_cpos);
1673                 *blkno = le64_to_cpu(rec->e_blkno) +
1674                                 ocfs2_clusters_to_blocks(inode->i_sb, coff);
1675                 *trunc_end = trunc_start;
1676         } else {
1677                 /*
1678                  * It may have two following possibilities:
1679                  *
1680                  * - last record has been removed
1681                  * - trunc_start was within a hole
1682                  *
1683                  * both two cases mean the completion of hole punching.
1684                  */
1685                 ret = 1;
1686         }
1687
1688         *done = ret;
1689 }
1690
1691 int ocfs2_remove_inode_range(struct inode *inode,
1692                              struct buffer_head *di_bh, u64 byte_start,
1693                              u64 byte_len)
1694 {
1695         int ret = 0, flags = 0, done = 0, i;
1696         u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1697         u32 cluster_in_el;
1698         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1699         struct ocfs2_cached_dealloc_ctxt dealloc;
1700         struct address_space *mapping = inode->i_mapping;
1701         struct ocfs2_extent_tree et;
1702         struct ocfs2_path *path = NULL;
1703         struct ocfs2_extent_list *el = NULL;
1704         struct ocfs2_extent_rec *rec = NULL;
1705         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1706         u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1707
1708         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1709         ocfs2_init_dealloc_ctxt(&dealloc);
1710
1711         trace_ocfs2_remove_inode_range(
1712                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1713                         (unsigned long long)byte_start,
1714                         (unsigned long long)byte_len);
1715
1716         if (byte_len == 0)
1717                 return 0;
1718
1719         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1720                 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1721                                             byte_start + byte_len, 0);
1722                 if (ret) {
1723                         mlog_errno(ret);
1724                         goto out;
1725                 }
1726                 /*
1727                  * There's no need to get fancy with the page cache
1728                  * truncate of an inline-data inode. We're talking
1729                  * about less than a page here, which will be cached
1730                  * in the dinode buffer anyway.
1731                  */
1732                 unmap_mapping_range(mapping, 0, 0, 0);
1733                 truncate_inode_pages(mapping, 0);
1734                 goto out;
1735         }
1736
1737         /*
1738          * For reflinks, we may need to CoW 2 clusters which might be
1739          * partially zero'd later, if hole's start and end offset were
1740          * within one cluster(means is not exactly aligned to clustersize).
1741          */
1742
1743         if (ocfs2_is_refcount_inode(inode)) {
1744                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1745                 if (ret) {
1746                         mlog_errno(ret);
1747                         goto out;
1748                 }
1749
1750                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1751                 if (ret) {
1752                         mlog_errno(ret);
1753                         goto out;
1754                 }
1755         }
1756
1757         trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1758         trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1759         cluster_in_el = trunc_end;
1760
1761         ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1762         if (ret) {
1763                 mlog_errno(ret);
1764                 goto out;
1765         }
1766
1767         path = ocfs2_new_path_from_et(&et);
1768         if (!path) {
1769                 ret = -ENOMEM;
1770                 mlog_errno(ret);
1771                 goto out;
1772         }
1773
1774         while (trunc_end > trunc_start) {
1775
1776                 ret = ocfs2_find_path(INODE_CACHE(inode), path,
1777                                       cluster_in_el);
1778                 if (ret) {
1779                         mlog_errno(ret);
1780                         goto out;
1781                 }
1782
1783                 el = path_leaf_el(path);
1784
1785                 i = ocfs2_find_rec(el, trunc_end);
1786                 /*
1787                  * Need to go to previous extent block.
1788                  */
1789                 if (i < 0) {
1790                         if (path->p_tree_depth == 0)
1791                                 break;
1792
1793                         ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1794                                                             path,
1795                                                             &cluster_in_el);
1796                         if (ret) {
1797                                 mlog_errno(ret);
1798                                 goto out;
1799                         }
1800
1801                         /*
1802                          * We've reached the leftmost extent block,
1803                          * it's safe to leave.
1804                          */
1805                         if (cluster_in_el == 0)
1806                                 break;
1807
1808                         /*
1809                          * The 'pos' searched for previous extent block is
1810                          * always one cluster less than actual trunc_end.
1811                          */
1812                         trunc_end = cluster_in_el + 1;
1813
1814                         ocfs2_reinit_path(path, 1);
1815
1816                         continue;
1817
1818                 } else
1819                         rec = &el->l_recs[i];
1820
1821                 ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1822                                      &trunc_len, &trunc_end, &blkno, &done);
1823                 if (done)
1824                         break;
1825
1826                 flags = rec->e_flags;
1827                 phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1828
1829                 ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1830                                                phys_cpos, trunc_len, flags,
1831                                                &dealloc, refcount_loc, false);
1832                 if (ret < 0) {
1833                         mlog_errno(ret);
1834                         goto out;
1835                 }
1836
1837                 cluster_in_el = trunc_end;
1838
1839                 ocfs2_reinit_path(path, 1);
1840         }
1841
1842         ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1843
1844 out:
1845         ocfs2_free_path(path);
1846         ocfs2_schedule_truncate_log_flush(osb, 1);
1847         ocfs2_run_deallocs(osb, &dealloc);
1848
1849         return ret;
1850 }
1851
1852 /*
1853  * Parts of this function taken from xfs_change_file_space()
1854  */
1855 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1856                                      loff_t f_pos, unsigned int cmd,
1857                                      struct ocfs2_space_resv *sr,
1858                                      int change_size)
1859 {
1860         int ret;
1861         s64 llen;
1862         loff_t size;
1863         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1864         struct buffer_head *di_bh = NULL;
1865         handle_t *handle;
1866         unsigned long long max_off = inode->i_sb->s_maxbytes;
1867
1868         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1869                 return -EROFS;
1870
1871         inode_lock(inode);
1872
1873         /*
1874          * This prevents concurrent writes on other nodes
1875          */
1876         ret = ocfs2_rw_lock(inode, 1);
1877         if (ret) {
1878                 mlog_errno(ret);
1879                 goto out;
1880         }
1881
1882         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1883         if (ret) {
1884                 mlog_errno(ret);
1885                 goto out_rw_unlock;
1886         }
1887
1888         if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1889                 ret = -EPERM;
1890                 goto out_inode_unlock;
1891         }
1892
1893         switch (sr->l_whence) {
1894         case 0: /*SEEK_SET*/
1895                 break;
1896         case 1: /*SEEK_CUR*/
1897                 sr->l_start += f_pos;
1898                 break;
1899         case 2: /*SEEK_END*/
1900                 sr->l_start += i_size_read(inode);
1901                 break;
1902         default:
1903                 ret = -EINVAL;
1904                 goto out_inode_unlock;
1905         }
1906         sr->l_whence = 0;
1907
1908         llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1909
1910         if (sr->l_start < 0
1911             || sr->l_start > max_off
1912             || (sr->l_start + llen) < 0
1913             || (sr->l_start + llen) > max_off) {
1914                 ret = -EINVAL;
1915                 goto out_inode_unlock;
1916         }
1917         size = sr->l_start + sr->l_len;
1918
1919         if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64 ||
1920             cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) {
1921                 if (sr->l_len <= 0) {
1922                         ret = -EINVAL;
1923                         goto out_inode_unlock;
1924                 }
1925         }
1926
1927         if (file && should_remove_suid(file->f_path.dentry)) {
1928                 ret = __ocfs2_write_remove_suid(inode, di_bh);
1929                 if (ret) {
1930                         mlog_errno(ret);
1931                         goto out_inode_unlock;
1932                 }
1933         }
1934
1935         down_write(&OCFS2_I(inode)->ip_alloc_sem);
1936         switch (cmd) {
1937         case OCFS2_IOC_RESVSP:
1938         case OCFS2_IOC_RESVSP64:
1939                 /*
1940                  * This takes unsigned offsets, but the signed ones we
1941                  * pass have been checked against overflow above.
1942                  */
1943                 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1944                                                        sr->l_len);
1945                 break;
1946         case OCFS2_IOC_UNRESVSP:
1947         case OCFS2_IOC_UNRESVSP64:
1948                 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1949                                                sr->l_len);
1950                 break;
1951         default:
1952                 ret = -EINVAL;
1953         }
1954         up_write(&OCFS2_I(inode)->ip_alloc_sem);
1955         if (ret) {
1956                 mlog_errno(ret);
1957                 goto out_inode_unlock;
1958         }
1959
1960         /*
1961          * We update c/mtime for these changes
1962          */
1963         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1964         if (IS_ERR(handle)) {
1965                 ret = PTR_ERR(handle);
1966                 mlog_errno(ret);
1967                 goto out_inode_unlock;
1968         }
1969
1970         if (change_size && i_size_read(inode) < size)
1971                 i_size_write(inode, size);
1972
1973         inode->i_ctime = inode->i_mtime = current_time(inode);
1974         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1975         if (ret < 0)
1976                 mlog_errno(ret);
1977
1978         if (file && (file->f_flags & O_SYNC))
1979                 handle->h_sync = 1;
1980
1981         ocfs2_commit_trans(osb, handle);
1982
1983 out_inode_unlock:
1984         brelse(di_bh);
1985         ocfs2_inode_unlock(inode, 1);
1986 out_rw_unlock:
1987         ocfs2_rw_unlock(inode, 1);
1988
1989 out:
1990         inode_unlock(inode);
1991         return ret;
1992 }
1993
1994 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1995                             struct ocfs2_space_resv *sr)
1996 {
1997         struct inode *inode = file_inode(file);
1998         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1999         int ret;
2000
2001         if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
2002             !ocfs2_writes_unwritten_extents(osb))
2003                 return -ENOTTY;
2004         else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
2005                  !ocfs2_sparse_alloc(osb))
2006                 return -ENOTTY;
2007
2008         if (!S_ISREG(inode->i_mode))
2009                 return -EINVAL;
2010
2011         if (!(file->f_mode & FMODE_WRITE))
2012                 return -EBADF;
2013
2014         ret = mnt_want_write_file(file);
2015         if (ret)
2016                 return ret;
2017         ret = __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
2018         mnt_drop_write_file(file);
2019         return ret;
2020 }
2021
2022 static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
2023                             loff_t len)
2024 {
2025         struct inode *inode = file_inode(file);
2026         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2027         struct ocfs2_space_resv sr;
2028         int change_size = 1;
2029         int cmd = OCFS2_IOC_RESVSP64;
2030
2031         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2032                 return -EOPNOTSUPP;
2033         if (!ocfs2_writes_unwritten_extents(osb))
2034                 return -EOPNOTSUPP;
2035
2036         if (mode & FALLOC_FL_KEEP_SIZE)
2037                 change_size = 0;
2038
2039         if (mode & FALLOC_FL_PUNCH_HOLE)
2040                 cmd = OCFS2_IOC_UNRESVSP64;
2041
2042         sr.l_whence = 0;
2043         sr.l_start = (s64)offset;
2044         sr.l_len = (s64)len;
2045
2046         return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
2047                                          change_size);
2048 }
2049
2050 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2051                                    size_t count)
2052 {
2053         int ret = 0;
2054         unsigned int extent_flags;
2055         u32 cpos, clusters, extent_len, phys_cpos;
2056         struct super_block *sb = inode->i_sb;
2057
2058         if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2059             !ocfs2_is_refcount_inode(inode) ||
2060             OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2061                 return 0;
2062
2063         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2064         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2065
2066         while (clusters) {
2067                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2068                                          &extent_flags);
2069                 if (ret < 0) {
2070                         mlog_errno(ret);
2071                         goto out;
2072                 }
2073
2074                 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2075                         ret = 1;
2076                         break;
2077                 }
2078
2079                 if (extent_len > clusters)
2080                         extent_len = clusters;
2081
2082                 clusters -= extent_len;
2083                 cpos += extent_len;
2084         }
2085 out:
2086         return ret;
2087 }
2088
2089 static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
2090 {
2091         int blockmask = inode->i_sb->s_blocksize - 1;
2092         loff_t final_size = pos + count;
2093
2094         if ((pos & blockmask) || (final_size & blockmask))
2095                 return 1;
2096         return 0;
2097 }
2098
2099 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
2100                                             struct file *file,
2101                                             loff_t pos, size_t count,
2102                                             int *meta_level)
2103 {
2104         int ret;
2105         struct buffer_head *di_bh = NULL;
2106         u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2107         u32 clusters =
2108                 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2109
2110         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2111         if (ret) {
2112                 mlog_errno(ret);
2113                 goto out;
2114         }
2115
2116         *meta_level = 1;
2117
2118         ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
2119         if (ret)
2120                 mlog_errno(ret);
2121 out:
2122         brelse(di_bh);
2123         return ret;
2124 }
2125
2126 static int ocfs2_prepare_inode_for_write(struct file *file,
2127                                          loff_t pos, size_t count, int wait)
2128 {
2129         int ret = 0, meta_level = 0, overwrite_io = 0;
2130         struct dentry *dentry = file->f_path.dentry;
2131         struct inode *inode = d_inode(dentry);
2132         struct buffer_head *di_bh = NULL;
2133
2134         /*
2135          * We start with a read level meta lock and only jump to an ex
2136          * if we need to make modifications here.
2137          */
2138         for(;;) {
2139                 if (wait)
2140                         ret = ocfs2_inode_lock(inode, NULL, meta_level);
2141                 else
2142                         ret = ocfs2_try_inode_lock(inode,
2143                                 overwrite_io ? NULL : &di_bh, meta_level);
2144                 if (ret < 0) {
2145                         meta_level = -1;
2146                         if (ret != -EAGAIN)
2147                                 mlog_errno(ret);
2148                         goto out;
2149                 }
2150
2151                 /*
2152                  * Check if IO will overwrite allocated blocks in case
2153                  * IOCB_NOWAIT flag is set.
2154                  */
2155                 if (!wait && !overwrite_io) {
2156                         overwrite_io = 1;
2157                         if (!down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem)) {
2158                                 ret = -EAGAIN;
2159                                 goto out_unlock;
2160                         }
2161
2162                         ret = ocfs2_overwrite_io(inode, di_bh, pos, count);
2163                         brelse(di_bh);
2164                         di_bh = NULL;
2165                         up_read(&OCFS2_I(inode)->ip_alloc_sem);
2166                         if (ret < 0) {
2167                                 if (ret != -EAGAIN)
2168                                         mlog_errno(ret);
2169                                 goto out_unlock;
2170                         }
2171                 }
2172
2173                 /* Clear suid / sgid if necessary. We do this here
2174                  * instead of later in the write path because
2175                  * remove_suid() calls ->setattr without any hint that
2176                  * we may have already done our cluster locking. Since
2177                  * ocfs2_setattr() *must* take cluster locks to
2178                  * proceed, this will lead us to recursively lock the
2179                  * inode. There's also the dinode i_size state which
2180                  * can be lost via setattr during extending writes (we
2181                  * set inode->i_size at the end of a write. */
2182                 if (should_remove_suid(dentry)) {
2183                         if (meta_level == 0) {
2184                                 ocfs2_inode_unlock(inode, meta_level);
2185                                 meta_level = 1;
2186                                 continue;
2187                         }
2188
2189                         ret = ocfs2_write_remove_suid(inode);
2190                         if (ret < 0) {
2191                                 mlog_errno(ret);
2192                                 goto out_unlock;
2193                         }
2194                 }
2195
2196                 ret = ocfs2_check_range_for_refcount(inode, pos, count);
2197                 if (ret == 1) {
2198                         ocfs2_inode_unlock(inode, meta_level);
2199                         meta_level = -1;
2200
2201                         ret = ocfs2_prepare_inode_for_refcount(inode,
2202                                                                file,
2203                                                                pos,
2204                                                                count,
2205                                                                &meta_level);
2206                 }
2207
2208                 if (ret < 0) {
2209                         mlog_errno(ret);
2210                         goto out_unlock;
2211                 }
2212
2213                 break;
2214         }
2215
2216 out_unlock:
2217         trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
2218                                             pos, count, wait);
2219
2220         brelse(di_bh);
2221
2222         if (meta_level >= 0)
2223                 ocfs2_inode_unlock(inode, meta_level);
2224
2225 out:
2226         return ret;
2227 }
2228
2229 static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
2230                                     struct iov_iter *from)
2231 {
2232         int rw_level;
2233         ssize_t written = 0;
2234         ssize_t ret;
2235         size_t count = iov_iter_count(from);
2236         struct file *file = iocb->ki_filp;
2237         struct inode *inode = file_inode(file);
2238         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2239         int full_coherency = !(osb->s_mount_opt &
2240                                OCFS2_MOUNT_COHERENCY_BUFFERED);
2241         void *saved_ki_complete = NULL;
2242         int append_write = ((iocb->ki_pos + count) >=
2243                         i_size_read(inode) ? 1 : 0);
2244         int direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
2245         int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
2246
2247         trace_ocfs2_file_write_iter(inode, file, file->f_path.dentry,
2248                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
2249                 file->f_path.dentry->d_name.len,
2250                 file->f_path.dentry->d_name.name,
2251                 (unsigned int)from->nr_segs);   /* GRRRRR */
2252
2253         if (!direct_io && nowait)
2254                 return -EOPNOTSUPP;
2255
2256         if (count == 0)
2257                 return 0;
2258
2259         if (nowait) {
2260                 if (!inode_trylock(inode))
2261                         return -EAGAIN;
2262         } else
2263                 inode_lock(inode);
2264
2265         /*
2266          * Concurrent O_DIRECT writes are allowed with
2267          * mount_option "coherency=buffered".
2268          * For append write, we must take rw EX.
2269          */
2270         rw_level = (!direct_io || full_coherency || append_write);
2271
2272         if (nowait)
2273                 ret = ocfs2_try_rw_lock(inode, rw_level);
2274         else
2275                 ret = ocfs2_rw_lock(inode, rw_level);
2276         if (ret < 0) {
2277                 if (ret != -EAGAIN)
2278                         mlog_errno(ret);
2279                 goto out_mutex;
2280         }
2281
2282         /*
2283          * O_DIRECT writes with "coherency=full" need to take EX cluster
2284          * inode_lock to guarantee coherency.
2285          */
2286         if (direct_io && full_coherency) {
2287                 /*
2288                  * We need to take and drop the inode lock to force
2289                  * other nodes to drop their caches.  Buffered I/O
2290                  * already does this in write_begin().
2291                  */
2292                 if (nowait)
2293                         ret = ocfs2_try_inode_lock(inode, NULL, 1);
2294                 else
2295                         ret = ocfs2_inode_lock(inode, NULL, 1);
2296                 if (ret < 0) {
2297                         if (ret != -EAGAIN)
2298                                 mlog_errno(ret);
2299                         goto out;
2300                 }
2301
2302                 ocfs2_inode_unlock(inode, 1);
2303         }
2304
2305         ret = generic_write_checks(iocb, from);
2306         if (ret <= 0) {
2307                 if (ret)
2308                         mlog_errno(ret);
2309                 goto out;
2310         }
2311         count = ret;
2312
2313         ret = ocfs2_prepare_inode_for_write(file, iocb->ki_pos, count, !nowait);
2314         if (ret < 0) {
2315                 if (ret != -EAGAIN)
2316                         mlog_errno(ret);
2317                 goto out;
2318         }
2319
2320         if (direct_io && !is_sync_kiocb(iocb) &&
2321             ocfs2_is_io_unaligned(inode, count, iocb->ki_pos)) {
2322                 /*
2323                  * Make it a sync io if it's an unaligned aio.
2324                  */
2325                 saved_ki_complete = xchg(&iocb->ki_complete, NULL);
2326         }
2327
2328         /* communicate with ocfs2_dio_end_io */
2329         ocfs2_iocb_set_rw_locked(iocb, rw_level);
2330
2331         written = __generic_file_write_iter(iocb, from);
2332         /* buffered aio wouldn't have proper lock coverage today */
2333         BUG_ON(written == -EIOCBQUEUED && !direct_io);
2334
2335         /*
2336          * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2337          * function pointer which is called when o_direct io completes so that
2338          * it can unlock our rw lock.
2339          * Unfortunately there are error cases which call end_io and others
2340          * that don't.  so we don't have to unlock the rw_lock if either an
2341          * async dio is going to do it in the future or an end_io after an
2342          * error has already done it.
2343          */
2344         if ((written == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2345                 rw_level = -1;
2346         }
2347
2348         if (unlikely(written <= 0))
2349                 goto out;
2350
2351         if (((file->f_flags & O_DSYNC) && !direct_io) ||
2352             IS_SYNC(inode)) {
2353                 ret = filemap_fdatawrite_range(file->f_mapping,
2354                                                iocb->ki_pos - written,
2355                                                iocb->ki_pos - 1);
2356                 if (ret < 0)
2357                         written = ret;
2358
2359                 if (!ret) {
2360                         ret = jbd2_journal_force_commit(osb->journal->j_journal);
2361                         if (ret < 0)
2362                                 written = ret;
2363                 }
2364
2365                 if (!ret)
2366                         ret = filemap_fdatawait_range(file->f_mapping,
2367                                                       iocb->ki_pos - written,
2368                                                       iocb->ki_pos - 1);
2369         }
2370
2371 out:
2372         if (saved_ki_complete)
2373                 xchg(&iocb->ki_complete, saved_ki_complete);
2374
2375         if (rw_level != -1)
2376                 ocfs2_rw_unlock(inode, rw_level);
2377
2378 out_mutex:
2379         inode_unlock(inode);
2380
2381         if (written)
2382                 ret = written;
2383         return ret;
2384 }
2385
2386 static ssize_t ocfs2_file_read_iter(struct kiocb *iocb,
2387                                    struct iov_iter *to)
2388 {
2389         int ret = 0, rw_level = -1, lock_level = 0;
2390         struct file *filp = iocb->ki_filp;
2391         struct inode *inode = file_inode(filp);
2392         int direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
2393         int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
2394
2395         trace_ocfs2_file_read_iter(inode, filp, filp->f_path.dentry,
2396                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2397                         filp->f_path.dentry->d_name.len,
2398                         filp->f_path.dentry->d_name.name,
2399                         to->nr_segs);   /* GRRRRR */
2400
2401
2402         if (!inode) {
2403                 ret = -EINVAL;
2404                 mlog_errno(ret);
2405                 goto bail;
2406         }
2407
2408         if (!direct_io && nowait)
2409                 return -EOPNOTSUPP;
2410
2411         /*
2412          * buffered reads protect themselves in ->readpage().  O_DIRECT reads
2413          * need locks to protect pending reads from racing with truncate.
2414          */
2415         if (direct_io) {
2416                 if (nowait)
2417                         ret = ocfs2_try_rw_lock(inode, 0);
2418                 else
2419                         ret = ocfs2_rw_lock(inode, 0);
2420
2421                 if (ret < 0) {
2422                         if (ret != -EAGAIN)
2423                                 mlog_errno(ret);
2424                         goto bail;
2425                 }
2426                 rw_level = 0;
2427                 /* communicate with ocfs2_dio_end_io */
2428                 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2429         }
2430
2431         /*
2432          * We're fine letting folks race truncates and extending
2433          * writes with read across the cluster, just like they can
2434          * locally. Hence no rw_lock during read.
2435          *
2436          * Take and drop the meta data lock to update inode fields
2437          * like i_size. This allows the checks down below
2438          * generic_file_read_iter() a chance of actually working.
2439          */
2440         ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level,
2441                                      !nowait);
2442         if (ret < 0) {
2443                 if (ret != -EAGAIN)
2444                         mlog_errno(ret);
2445                 goto bail;
2446         }
2447         ocfs2_inode_unlock(inode, lock_level);
2448
2449         ret = generic_file_read_iter(iocb, to);
2450         trace_generic_file_read_iter_ret(ret);
2451
2452         /* buffered aio wouldn't have proper lock coverage today */
2453         BUG_ON(ret == -EIOCBQUEUED && !direct_io);
2454
2455         /* see ocfs2_file_write_iter */
2456         if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2457                 rw_level = -1;
2458         }
2459
2460 bail:
2461         if (rw_level != -1)
2462                 ocfs2_rw_unlock(inode, rw_level);
2463
2464         return ret;
2465 }
2466
2467 /* Refer generic_file_llseek_unlocked() */
2468 static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int whence)
2469 {
2470         struct inode *inode = file->f_mapping->host;
2471         int ret = 0;
2472
2473         inode_lock(inode);
2474
2475         switch (whence) {
2476         case SEEK_SET:
2477                 break;
2478         case SEEK_END:
2479                 /* SEEK_END requires the OCFS2 inode lock for the file
2480                  * because it references the file's size.
2481                  */
2482                 ret = ocfs2_inode_lock(inode, NULL, 0);
2483                 if (ret < 0) {
2484                         mlog_errno(ret);
2485                         goto out;
2486                 }
2487                 offset += i_size_read(inode);
2488                 ocfs2_inode_unlock(inode, 0);
2489                 break;
2490         case SEEK_CUR:
2491                 if (offset == 0) {
2492                         offset = file->f_pos;
2493                         goto out;
2494                 }
2495                 offset += file->f_pos;
2496                 break;
2497         case SEEK_DATA:
2498         case SEEK_HOLE:
2499                 ret = ocfs2_seek_data_hole_offset(file, &offset, whence);
2500                 if (ret)
2501                         goto out;
2502                 break;
2503         default:
2504                 ret = -EINVAL;
2505                 goto out;
2506         }
2507
2508         offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
2509
2510 out:
2511         inode_unlock(inode);
2512         if (ret)
2513                 return ret;
2514         return offset;
2515 }
2516
2517 static loff_t ocfs2_remap_file_range(struct file *file_in, loff_t pos_in,
2518                                      struct file *file_out, loff_t pos_out,
2519                                      loff_t len, unsigned int remap_flags)
2520 {
2521         struct inode *inode_in = file_inode(file_in);
2522         struct inode *inode_out = file_inode(file_out);
2523         struct ocfs2_super *osb = OCFS2_SB(inode_in->i_sb);
2524         struct buffer_head *in_bh = NULL, *out_bh = NULL;
2525         bool same_inode = (inode_in == inode_out);
2526         loff_t remapped = 0;
2527         ssize_t ret;
2528
2529         if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
2530                 return -EINVAL;
2531         if (!ocfs2_refcount_tree(osb))
2532                 return -EOPNOTSUPP;
2533         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
2534                 return -EROFS;
2535
2536         /* Lock both files against IO */
2537         ret = ocfs2_reflink_inodes_lock(inode_in, &in_bh, inode_out, &out_bh);
2538         if (ret)
2539                 return ret;
2540
2541         /* Check file eligibility and prepare for block sharing. */
2542         ret = -EINVAL;
2543         if ((OCFS2_I(inode_in)->ip_flags & OCFS2_INODE_SYSTEM_FILE) ||
2544             (OCFS2_I(inode_out)->ip_flags & OCFS2_INODE_SYSTEM_FILE))
2545                 goto out_unlock;
2546
2547         ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out,
2548                         &len, remap_flags);
2549         if (ret < 0 || len == 0)
2550                 goto out_unlock;
2551
2552         /* Lock out changes to the allocation maps and remap. */
2553         down_write(&OCFS2_I(inode_in)->ip_alloc_sem);
2554         if (!same_inode)
2555                 down_write_nested(&OCFS2_I(inode_out)->ip_alloc_sem,
2556                                   SINGLE_DEPTH_NESTING);
2557
2558         /* Zap any page cache for the destination file's range. */
2559         truncate_inode_pages_range(&inode_out->i_data,
2560                                    round_down(pos_out, PAGE_SIZE),
2561                                    round_up(pos_out + len, PAGE_SIZE) - 1);
2562
2563         remapped = ocfs2_reflink_remap_blocks(inode_in, in_bh, pos_in,
2564                         inode_out, out_bh, pos_out, len);
2565         up_write(&OCFS2_I(inode_in)->ip_alloc_sem);
2566         if (!same_inode)
2567                 up_write(&OCFS2_I(inode_out)->ip_alloc_sem);
2568         if (remapped < 0) {
2569                 ret = remapped;
2570                 mlog_errno(ret);
2571                 goto out_unlock;
2572         }
2573
2574         /*
2575          * Empty the extent map so that we may get the right extent
2576          * record from the disk.
2577          */
2578         ocfs2_extent_map_trunc(inode_in, 0);
2579         ocfs2_extent_map_trunc(inode_out, 0);
2580
2581         ret = ocfs2_reflink_update_dest(inode_out, out_bh, pos_out + len);
2582         if (ret) {
2583                 mlog_errno(ret);
2584                 goto out_unlock;
2585         }
2586
2587 out_unlock:
2588         ocfs2_reflink_inodes_unlock(inode_in, in_bh, inode_out, out_bh);
2589         return remapped > 0 ? remapped : ret;
2590 }
2591
2592 const struct inode_operations ocfs2_file_iops = {
2593         .setattr        = ocfs2_setattr,
2594         .getattr        = ocfs2_getattr,
2595         .permission     = ocfs2_permission,
2596         .listxattr      = ocfs2_listxattr,
2597         .fiemap         = ocfs2_fiemap,
2598         .get_acl        = ocfs2_iop_get_acl,
2599         .set_acl        = ocfs2_iop_set_acl,
2600 };
2601
2602 const struct inode_operations ocfs2_special_file_iops = {
2603         .setattr        = ocfs2_setattr,
2604         .getattr        = ocfs2_getattr,
2605         .permission     = ocfs2_permission,
2606         .get_acl        = ocfs2_iop_get_acl,
2607         .set_acl        = ocfs2_iop_set_acl,
2608 };
2609
2610 /*
2611  * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2612  * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2613  */
2614 const struct file_operations ocfs2_fops = {
2615         .llseek         = ocfs2_file_llseek,
2616         .mmap           = ocfs2_mmap,
2617         .fsync          = ocfs2_sync_file,
2618         .release        = ocfs2_file_release,
2619         .open           = ocfs2_file_open,
2620         .read_iter      = ocfs2_file_read_iter,
2621         .write_iter     = ocfs2_file_write_iter,
2622         .unlocked_ioctl = ocfs2_ioctl,
2623 #ifdef CONFIG_COMPAT
2624         .compat_ioctl   = ocfs2_compat_ioctl,
2625 #endif
2626         .lock           = ocfs2_lock,
2627         .flock          = ocfs2_flock,
2628         .splice_read    = generic_file_splice_read,
2629         .splice_write   = iter_file_splice_write,
2630         .fallocate      = ocfs2_fallocate,
2631         .remap_file_range = ocfs2_remap_file_range,
2632 };
2633
2634 const struct file_operations ocfs2_dops = {
2635         .llseek         = generic_file_llseek,
2636         .read           = generic_read_dir,
2637         .iterate        = ocfs2_readdir,
2638         .fsync          = ocfs2_sync_file,
2639         .release        = ocfs2_dir_release,
2640         .open           = ocfs2_dir_open,
2641         .unlocked_ioctl = ocfs2_ioctl,
2642 #ifdef CONFIG_COMPAT
2643         .compat_ioctl   = ocfs2_compat_ioctl,
2644 #endif
2645         .lock           = ocfs2_lock,
2646         .flock          = ocfs2_flock,
2647 };
2648
2649 /*
2650  * POSIX-lockless variants of our file_operations.
2651  *
2652  * These will be used if the underlying cluster stack does not support
2653  * posix file locking, if the user passes the "localflocks" mount
2654  * option, or if we have a local-only fs.
2655  *
2656  * ocfs2_flock is in here because all stacks handle UNIX file locks,
2657  * so we still want it in the case of no stack support for
2658  * plocks. Internally, it will do the right thing when asked to ignore
2659  * the cluster.
2660  */
2661 const struct file_operations ocfs2_fops_no_plocks = {
2662         .llseek         = ocfs2_file_llseek,
2663         .mmap           = ocfs2_mmap,
2664         .fsync          = ocfs2_sync_file,
2665         .release        = ocfs2_file_release,
2666         .open           = ocfs2_file_open,
2667         .read_iter      = ocfs2_file_read_iter,
2668         .write_iter     = ocfs2_file_write_iter,
2669         .unlocked_ioctl = ocfs2_ioctl,
2670 #ifdef CONFIG_COMPAT
2671         .compat_ioctl   = ocfs2_compat_ioctl,
2672 #endif
2673         .flock          = ocfs2_flock,
2674         .splice_read    = generic_file_splice_read,
2675         .splice_write   = iter_file_splice_write,
2676         .fallocate      = ocfs2_fallocate,
2677         .remap_file_range = ocfs2_remap_file_range,
2678 };
2679
2680 const struct file_operations ocfs2_dops_no_plocks = {
2681         .llseek         = generic_file_llseek,
2682         .read           = generic_read_dir,
2683         .iterate        = ocfs2_readdir,
2684         .fsync          = ocfs2_sync_file,
2685         .release        = ocfs2_dir_release,
2686         .open           = ocfs2_dir_open,
2687         .unlocked_ioctl = ocfs2_ioctl,
2688 #ifdef CONFIG_COMPAT
2689         .compat_ioctl   = ocfs2_compat_ioctl,
2690 #endif
2691         .flock          = ocfs2_flock,
2692 };