Pileus Git - ~andy/linux/blob - fs/ocfs2/file.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * file.c
   5  *
   6  * File open, close, extend, truncate
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #include <linux/capability.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/highmem.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/uio.h>
  33 #include <linux/sched.h>
  34 #include <linux/splice.h>
  35 #include <linux/mount.h>
  36 #include <linux/writeback.h>
  37 #include <linux/falloc.h>
  38 #include <linux/quotaops.h>
  39 #include <linux/blkdev.h>
  40
  41 #include <cluster/masklog.h>
  42
  43 #include "ocfs2.h"
  44
  45 #include "alloc.h"
  46 #include "aops.h"
  47 #include "dir.h"
  48 #include "dlmglue.h"
  49 #include "extent_map.h"
  50 #include "file.h"
  51 #include "sysfile.h"
  52 #include "inode.h"
  53 #include "ioctl.h"
  54 #include "journal.h"
  55 #include "locks.h"
  56 #include "mmap.h"
  57 #include "suballoc.h"
  58 #include "super.h"
  59 #include "xattr.h"
  60 #include "acl.h"
  61 #include "quota.h"
  62 #include "refcounttree.h"
  63 #include "ocfs2_trace.h"
  64
  65 #include "buffer_head_io.h"
  66
  67 static int ocfs2_init_file_private(struct inode *inode, struct file *file)
  68 {
  69         struct ocfs2_file_private *fp;
  70
  71         fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
  72         if (!fp)
  73                 return -ENOMEM;
  74
  75         fp->fp_file = file;
  76         mutex_init(&fp->fp_mutex);
  77         ocfs2_file_lock_res_init(&fp->fp_flock, fp);
  78         file->private_data = fp;
  79
  80         return 0;
  81 }
  82
  83 static void ocfs2_free_file_private(struct inode *inode, struct file *file)
  84 {
  85         struct ocfs2_file_private *fp = file->private_data;
  86         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  87
  88         if (fp) {
  89                 ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
  90                 ocfs2_lock_res_free(&fp->fp_flock);
  91                 kfree(fp);
  92                 file->private_data = NULL;
  93         }
  94 }
  95
  96 static int ocfs2_file_open(struct inode *inode, struct file *file)
  97 {
  98         int status;
  99         int mode = file->f_flags;
 100         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 101
 102         trace_ocfs2_file_open(inode, file, file->f_path.dentry,
 103                               (unsigned long long)OCFS2_I(inode)->ip_blkno,
 104                               file->f_path.dentry->d_name.len,
 105                               file->f_path.dentry->d_name.name, mode);
 106
 107         if (file->f_mode & FMODE_WRITE)
 108                 dquot_initialize(inode);
 109
 110         spin_lock(&oi->ip_lock);
 111
 112         /* Check that the inode hasn't been wiped from disk by another
 113          * node. If it hasn't then we're safe as long as we hold the
 114          * spin lock until our increment of open count. */
 115         if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
 116                 spin_unlock(&oi->ip_lock);
 117
 118                 status = -ENOENT;
 119                 goto leave;
 120         }
 121
 122         if (mode & O_DIRECT)
 123                 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
 124
 125         oi->ip_open_count++;
 126         spin_unlock(&oi->ip_lock);
 127
 128         status = ocfs2_init_file_private(inode, file);
 129         if (status) {
 130                 /*
 131                  * We want to set open count back if we're failing the
 132                  * open.
 133                  */
 134                 spin_lock(&oi->ip_lock);
 135                 oi->ip_open_count--;
 136                 spin_unlock(&oi->ip_lock);
 137         }
 138
 139 leave:
 140         return status;
 141 }
 142
 143 static int ocfs2_file_release(struct inode *inode, struct file *file)
 144 {
 145         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 146
 147         spin_lock(&oi->ip_lock);
 148         if (!--oi->ip_open_count)
 149                 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
 150
 151         trace_ocfs2_file_release(inode, file, file->f_path.dentry,
 152                                  oi->ip_blkno,
 153                                  file->f_path.dentry->d_name.len,
 154                                  file->f_path.dentry->d_name.name,
 155                                  oi->ip_open_count);
 156         spin_unlock(&oi->ip_lock);
 157
 158         ocfs2_free_file_private(inode, file);
 159
 160         return 0;
 161 }
 162
 163 static int ocfs2_dir_open(struct inode *inode, struct file *file)
 164 {
 165         return ocfs2_init_file_private(inode, file);
 166 }
 167
 168 static int ocfs2_dir_release(struct inode *inode, struct file *file)
 169 {
 170         ocfs2_free_file_private(inode, file);
 171         return 0;
 172 }
 173
 174 static int ocfs2_sync_file(struct file *file, loff_t start, loff_t end,
 175                            int datasync)
 176 {
 177         int err = 0;
 178         journal_t *journal;
 179         struct inode *inode = file->f_mapping->host;
 180         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 181
 182         trace_ocfs2_sync_file(inode, file, file->f_path.dentry,
 183                               OCFS2_I(inode)->ip_blkno,
 184                               file->f_path.dentry->d_name.len,
 185                               file->f_path.dentry->d_name.name,
 186                               (unsigned long long)datasync);
 187
 188         err = filemap_write_and_wait_range(inode->i_mapping, start, end);
 189         if (err)
 190                 return err;
 191
 192         /*
 193          * Probably don't need the i_mutex at all in here, just putting it here
 194          * to be consistent with how fsync used to be called, someone more
 195          * familiar with the fs could possibly remove it.
 196          */
 197         mutex_lock(&inode->i_mutex);
 198         if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) {
 199                 /*
 200                  * We still have to flush drive's caches to get data to the
 201                  * platter
 202                  */
 203                 if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
 204                         blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
 205                 goto bail;
 206         }
 207
 208         journal = osb->journal->j_journal;
 209         err = jbd2_journal_force_commit(journal);
 210
 211 bail:
 212         if (err)
 213                 mlog_errno(err);
 214         mutex_unlock(&inode->i_mutex);
 215
 216         return (err < 0) ? -EIO : 0;
 217 }
 218
 219 int ocfs2_should_update_atime(struct inode *inode,
 220                               struct vfsmount *vfsmnt)
 221 {
 222         struct timespec now;
 223         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 224
 225         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 226                 return 0;
 227
 228         if ((inode->i_flags & S_NOATIME) ||
 229             ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
 230                 return 0;
 231
 232         /*
 233          * We can be called with no vfsmnt structure - NFSD will
 234          * sometimes do this.
 235          *
 236          * Note that our action here is different than touch_atime() -
 237          * if we can't tell whether this is a noatime mount, then we
 238          * don't know whether to trust the value of s_atime_quantum.
 239          */
 240         if (vfsmnt == NULL)
 241                 return 0;
 242
 243         if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
 244             ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 245                 return 0;
 246
 247         if (vfsmnt->mnt_flags & MNT_RELATIME) {
 248                 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
 249                     (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
 250                         return 1;
 251
 252                 return 0;
 253         }
 254
 255         now = CURRENT_TIME;
 256         if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
 257                 return 0;
 258         else
 259                 return 1;
 260 }
 261
 262 int ocfs2_update_inode_atime(struct inode *inode,
 263                              struct buffer_head *bh)
 264 {
 265         int ret;
 266         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 267         handle_t *handle;
 268         struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
 269
 270         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 271         if (IS_ERR(handle)) {
 272                 ret = PTR_ERR(handle);
 273                 mlog_errno(ret);
 274                 goto out;
 275         }
 276
 277         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 278                                       OCFS2_JOURNAL_ACCESS_WRITE);
 279         if (ret) {
 280                 mlog_errno(ret);
 281                 goto out_commit;
 282         }
 283
 284         /*
 285          * Don't use ocfs2_mark_inode_dirty() here as we don't always
 286          * have i_mutex to guard against concurrent changes to other
 287          * inode fields.
 288          */
 289         inode->i_atime = CURRENT_TIME;
 290         di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 291         di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 292         ocfs2_journal_dirty(handle, bh);
 293
 294 out_commit:
 295         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 296 out:
 297         return ret;
 298 }
 299
 300 static int ocfs2_set_inode_size(handle_t *handle,
 301                                 struct inode *inode,
 302                                 struct buffer_head *fe_bh,
 303                                 u64 new_i_size)
 304 {
 305         int status;
 306
 307         i_size_write(inode, new_i_size);
 308         inode->i_blocks = ocfs2_inode_sector_count(inode);
 309         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 310
 311         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 312         if (status < 0) {
 313                 mlog_errno(status);
 314                 goto bail;
 315         }
 316
 317 bail:
 318         return status;
 319 }
 320
 321 int ocfs2_simple_size_update(struct inode *inode,
 322                              struct buffer_head *di_bh,
 323                              u64 new_i_size)
 324 {
 325         int ret;
 326         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 327         handle_t *handle = NULL;
 328
 329         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 330         if (IS_ERR(handle)) {
 331                 ret = PTR_ERR(handle);
 332                 mlog_errno(ret);
 333                 goto out;
 334         }
 335
 336         ret = ocfs2_set_inode_size(handle, inode, di_bh,
 337                                    new_i_size);
 338         if (ret < 0)
 339                 mlog_errno(ret);
 340
 341         ocfs2_commit_trans(osb, handle);
 342 out:
 343         return ret;
 344 }
 345
 346 static int ocfs2_cow_file_pos(struct inode *inode,
 347                               struct buffer_head *fe_bh,
 348                               u64 offset)
 349 {
 350         int status;
 351         u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 352         unsigned int num_clusters = 0;
 353         unsigned int ext_flags = 0;
 354
 355         /*
 356          * If the new offset is aligned to the range of the cluster, there is
 357          * no space for ocfs2_zero_range_for_truncate to fill, so no need to
 358          * CoW either.
 359          */
 360         if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
 361                 return 0;
 362
 363         status = ocfs2_get_clusters(inode, cpos, &phys,
 364                                     &num_clusters, &ext_flags);
 365         if (status) {
 366                 mlog_errno(status);
 367                 goto out;
 368         }
 369
 370         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
 371                 goto out;
 372
 373         return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1);
 374
 375 out:
 376         return status;
 377 }
 378
 379 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
 380                                      struct inode *inode,
 381                                      struct buffer_head *fe_bh,
 382                                      u64 new_i_size)
 383 {
 384         int status;
 385         handle_t *handle;
 386         struct ocfs2_dinode *di;
 387         u64 cluster_bytes;
 388
 389         /*
 390          * We need to CoW the cluster contains the offset if it is reflinked
 391          * since we will call ocfs2_zero_range_for_truncate later which will
 392          * write "0" from offset to the end of the cluster.
 393          */
 394         status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
 395         if (status) {
 396                 mlog_errno(status);
 397                 return status;
 398         }
 399
 400         /* TODO: This needs to actually orphan the inode in this
 401          * transaction. */
 402
 403         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 404         if (IS_ERR(handle)) {
 405                 status = PTR_ERR(handle);
 406                 mlog_errno(status);
 407                 goto out;
 408         }
 409
 410         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 411                                          OCFS2_JOURNAL_ACCESS_WRITE);
 412         if (status < 0) {
 413                 mlog_errno(status);
 414                 goto out_commit;
 415         }
 416
 417         /*
 418          * Do this before setting i_size.
 419          */
 420         cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
 421         status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
 422                                                cluster_bytes);
 423         if (status) {
 424                 mlog_errno(status);
 425                 goto out_commit;
 426         }
 427
 428         i_size_write(inode, new_i_size);
 429         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 430
 431         di = (struct ocfs2_dinode *) fe_bh->b_data;
 432         di->i_size = cpu_to_le64(new_i_size);
 433         di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
 434         di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 435
 436         ocfs2_journal_dirty(handle, fe_bh);
 437
 438 out_commit:
 439         ocfs2_commit_trans(osb, handle);
 440 out:
 441         return status;
 442 }
 443
 444 static int ocfs2_truncate_file(struct inode *inode,
 445                                struct buffer_head *di_bh,
 446                                u64 new_i_size)
 447 {
 448         int status = 0;
 449         struct ocfs2_dinode *fe = NULL;
 450         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 451
 452         /* We trust di_bh because it comes from ocfs2_inode_lock(), which
 453          * already validated it */
 454         fe = (struct ocfs2_dinode *) di_bh->b_data;
 455
 456         trace_ocfs2_truncate_file((unsigned long long)OCFS2_I(inode)->ip_blkno,
 457                                   (unsigned long long)le64_to_cpu(fe->i_size),
 458                                   (unsigned long long)new_i_size);
 459
 460         mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
 461                         "Inode %llu, inode i_size = %lld != di "
 462                         "i_size = %llu, i_flags = 0x%x\n",
 463                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 464                         i_size_read(inode),
 465                         (unsigned long long)le64_to_cpu(fe->i_size),
 466                         le32_to_cpu(fe->i_flags));
 467
 468         if (new_i_size > le64_to_cpu(fe->i_size)) {
 469                 trace_ocfs2_truncate_file_error(
 470                         (unsigned long long)le64_to_cpu(fe->i_size),
 471                         (unsigned long long)new_i_size);
 472                 status = -EINVAL;
 473                 mlog_errno(status);
 474                 goto bail;
 475         }
 476
 477         /* lets handle the simple truncate cases before doing any more
 478          * cluster locking. */
 479         if (new_i_size == le64_to_cpu(fe->i_size))
 480                 goto bail;
 481
 482         down_write(&OCFS2_I(inode)->ip_alloc_sem);
 483
 484         ocfs2_resv_discard(&osb->osb_la_resmap,
 485                            &OCFS2_I(inode)->ip_la_data_resv);
 486
 487         /*
 488          * The inode lock forced other nodes to sync and drop their
 489          * pages, which (correctly) happens even if we have a truncate
 490          * without allocation change - ocfs2 cluster sizes can be much
 491          * greater than page size, so we have to truncate them
 492          * anyway.
 493          */
 494         unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
 495         truncate_inode_pages(inode->i_mapping, new_i_size);
 496
 497         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
 498                 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
 499                                                i_size_read(inode), 1);
 500                 if (status)
 501                         mlog_errno(status);
 502
 503                 goto bail_unlock_sem;
 504         }
 505
 506         /* alright, we're going to need to do a full blown alloc size
 507          * change. Orphan the inode so that recovery can complete the
 508          * truncate if necessary. This does the task of marking
 509          * i_size. */
 510         status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
 511         if (status < 0) {
 512                 mlog_errno(status);
 513                 goto bail_unlock_sem;
 514         }
 515
 516         status = ocfs2_commit_truncate(osb, inode, di_bh);
 517         if (status < 0) {
 518                 mlog_errno(status);
 519                 goto bail_unlock_sem;
 520         }
 521
 522         /* TODO: orphan dir cleanup here. */
 523 bail_unlock_sem:
 524         up_write(&OCFS2_I(inode)->ip_alloc_sem);
 525
 526 bail:
 527         if (!status && OCFS2_I(inode)->ip_clusters == 0)
 528                 status = ocfs2_try_remove_refcount_tree(inode, di_bh);
 529
 530         return status;
 531 }
 532
 533 /*
 534  * extend file allocation only here.
 535  * we'll update all the disk stuff, and oip->alloc_size
 536  *
 537  * expect stuff to be locked, a transaction started and enough data /
 538  * metadata reservations in the contexts.
 539  *
 540  * Will return -EAGAIN, and a reason if a restart is needed.
 541  * If passed in, *reason will always be set, even in error.
 542  */
 543 int ocfs2_add_inode_data(struct ocfs2_super *osb,
 544                          struct inode *inode,
 545                          u32 *logical_offset,
 546                          u32 clusters_to_add,
 547                          int mark_unwritten,
 548                          struct buffer_head *fe_bh,
 549                          handle_t *handle,
 550                          struct ocfs2_alloc_context *data_ac,
 551                          struct ocfs2_alloc_context *meta_ac,
 552                          enum ocfs2_alloc_restarted *reason_ret)
 553 {
 554         int ret;
 555         struct ocfs2_extent_tree et;
 556
 557         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
 558         ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
 559                                           clusters_to_add, mark_unwritten,
 560                                           data_ac, meta_ac, reason_ret);
 561
 562         return ret;
 563 }
 564
 565 static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
 566                                      u32 clusters_to_add, int mark_unwritten)
 567 {
 568         int status = 0;
 569         int restart_func = 0;
 570         int credits;
 571         u32 prev_clusters;
 572         struct buffer_head *bh = NULL;
 573         struct ocfs2_dinode *fe = NULL;
 574         handle_t *handle = NULL;
 575         struct ocfs2_alloc_context *data_ac = NULL;
 576         struct ocfs2_alloc_context *meta_ac = NULL;
 577         enum ocfs2_alloc_restarted why;
 578         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 579         struct ocfs2_extent_tree et;
 580         int did_quota = 0;
 581
 582         /*
 583          * Unwritten extent only exists for file systems which
 584          * support holes.
 585          */
 586         BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
 587
 588         status = ocfs2_read_inode_block(inode, &bh);
 589         if (status < 0) {
 590                 mlog_errno(status);
 591                 goto leave;
 592         }
 593         fe = (struct ocfs2_dinode *) bh->b_data;
 594
 595 restart_all:
 596         BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
 597
 598         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
 599         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 600                                        &data_ac, &meta_ac);
 601         if (status) {
 602                 mlog_errno(status);
 603                 goto leave;
 604         }
 605
 606         credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list);
 607         handle = ocfs2_start_trans(osb, credits);
 608         if (IS_ERR(handle)) {
 609                 status = PTR_ERR(handle);
 610                 handle = NULL;
 611                 mlog_errno(status);
 612                 goto leave;
 613         }
 614
 615 restarted_transaction:
 616         trace_ocfs2_extend_allocation(
 617                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
 618                 (unsigned long long)i_size_read(inode),
 619                 le32_to_cpu(fe->i_clusters), clusters_to_add,
 620                 why, restart_func);
 621
 622         status = dquot_alloc_space_nodirty(inode,
 623                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 624         if (status)
 625                 goto leave;
 626         did_quota = 1;
 627
 628         /* reserve a write to the file entry early on - that we if we
 629          * run out of credits in the allocation path, we can still
 630          * update i_size. */
 631         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 632                                          OCFS2_JOURNAL_ACCESS_WRITE);
 633         if (status < 0) {
 634                 mlog_errno(status);
 635                 goto leave;
 636         }
 637
 638         prev_clusters = OCFS2_I(inode)->ip_clusters;
 639
 640         status = ocfs2_add_inode_data(osb,
 641                                       inode,
 642                                       &logical_start,
 643                                       clusters_to_add,
 644                                       mark_unwritten,
 645                                       bh,
 646                                       handle,
 647                                       data_ac,
 648                                       meta_ac,
 649                                       &why);
 650         if ((status < 0) && (status != -EAGAIN)) {
 651                 if (status != -ENOSPC)
 652                         mlog_errno(status);
 653                 goto leave;
 654         }
 655
 656         ocfs2_journal_dirty(handle, bh);
 657
 658         spin_lock(&OCFS2_I(inode)->ip_lock);
 659         clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
 660         spin_unlock(&OCFS2_I(inode)->ip_lock);
 661         /* Release unused quota reservation */
 662         dquot_free_space(inode,
 663                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 664         did_quota = 0;
 665
 666         if (why != RESTART_NONE && clusters_to_add) {
 667                 if (why == RESTART_META) {
 668                         restart_func = 1;
 669                         status = 0;
 670                 } else {
 671                         BUG_ON(why != RESTART_TRANS);
 672
 673                         status = ocfs2_allocate_extend_trans(handle, 1);
 674                         if (status < 0) {
 675                                 /* handle still has to be committed at
 676                                  * this point. */
 677                                 status = -ENOMEM;
 678                                 mlog_errno(status);
 679                                 goto leave;
 680                         }
 681                         goto restarted_transaction;
 682                 }
 683         }
 684
 685         trace_ocfs2_extend_allocation_end(OCFS2_I(inode)->ip_blkno,
 686              le32_to_cpu(fe->i_clusters),
 687              (unsigned long long)le64_to_cpu(fe->i_size),
 688              OCFS2_I(inode)->ip_clusters,
 689              (unsigned long long)i_size_read(inode));
 690
 691 leave:
 692         if (status < 0 && did_quota)
 693                 dquot_free_space(inode,
 694                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 695         if (handle) {
 696                 ocfs2_commit_trans(osb, handle);
 697                 handle = NULL;
 698         }
 699         if (data_ac) {
 700                 ocfs2_free_alloc_context(data_ac);
 701                 data_ac = NULL;
 702         }
 703         if (meta_ac) {
 704                 ocfs2_free_alloc_context(meta_ac);
 705                 meta_ac = NULL;
 706         }
 707         if ((!status) && restart_func) {
 708                 restart_func = 0;
 709                 goto restart_all;
 710         }
 711         brelse(bh);
 712         bh = NULL;
 713
 714         return status;
 715 }
 716
 717 /*
 718  * While a write will already be ordering the data, a truncate will not.
 719  * Thus, we need to explicitly order the zeroed pages.
 720  */
 721 static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode)
 722 {
 723         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 724         handle_t *handle = NULL;
 725         int ret = 0;
 726
 727         if (!ocfs2_should_order_data(inode))
 728                 goto out;
 729
 730         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 731         if (IS_ERR(handle)) {
 732                 ret = -ENOMEM;
 733                 mlog_errno(ret);
 734                 goto out;
 735         }
 736
 737         ret = ocfs2_jbd2_file_inode(handle, inode);
 738         if (ret < 0)
 739                 mlog_errno(ret);
 740
 741 out:
 742         if (ret) {
 743                 if (!IS_ERR(handle))
 744                         ocfs2_commit_trans(osb, handle);
 745                 handle = ERR_PTR(ret);
 746         }
 747         return handle;
 748 }
 749
 750 /* Some parts of this taken from generic_cont_expand, which turned out
 751  * to be too fragile to do exactly what we need without us having to
 752  * worry about recursive locking in ->write_begin() and ->write_end(). */
 753 static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
 754                                  u64 abs_to)
 755 {
 756         struct address_space *mapping = inode->i_mapping;
 757         struct page *page;
 758         unsigned long index = abs_from >> PAGE_CACHE_SHIFT;
 759         handle_t *handle = NULL;
 760         int ret = 0;
 761         unsigned zero_from, zero_to, block_start, block_end;
 762
 763         BUG_ON(abs_from >= abs_to);
 764         BUG_ON(abs_to > (((u64)index + 1) << PAGE_CACHE_SHIFT));
 765         BUG_ON(abs_from & (inode->i_blkbits - 1));
 766
 767         page = find_or_create_page(mapping, index, GFP_NOFS);
 768         if (!page) {
 769                 ret = -ENOMEM;
 770                 mlog_errno(ret);
 771                 goto out;
 772         }
 773
 774         /* Get the offsets within the page that we want to zero */
 775         zero_from = abs_from & (PAGE_CACHE_SIZE - 1);
 776         zero_to = abs_to & (PAGE_CACHE_SIZE - 1);
 777         if (!zero_to)
 778                 zero_to = PAGE_CACHE_SIZE;
 779
 780         trace_ocfs2_write_zero_page(
 781                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 782                         (unsigned long long)abs_from,
 783                         (unsigned long long)abs_to,
 784                         index, zero_from, zero_to);
 785
 786         /* We know that zero_from is block aligned */
 787         for (block_start = zero_from; block_start < zero_to;
 788              block_start = block_end) {
 789                 block_end = block_start + (1 << inode->i_blkbits);
 790
 791                 /*
 792                  * block_start is block-aligned.  Bump it by one to force
 793                  * __block_write_begin and block_commit_write to zero the
 794                  * whole block.
 795                  */
 796                 ret = __block_write_begin(page, block_start + 1, 0,
 797                                           ocfs2_get_block);
 798                 if (ret < 0) {
 799                         mlog_errno(ret);
 800                         goto out_unlock;
 801                 }
 802
 803                 if (!handle) {
 804                         handle = ocfs2_zero_start_ordered_transaction(inode);
 805                         if (IS_ERR(handle)) {
 806                                 ret = PTR_ERR(handle);
 807                                 handle = NULL;
 808                                 break;
 809                         }
 810                 }
 811
 812                 /* must not update i_size! */
 813                 ret = block_commit_write(page, block_start + 1,
 814                                          block_start + 1);
 815                 if (ret < 0)
 816                         mlog_errno(ret);
 817                 else
 818                         ret = 0;
 819         }
 820
 821         if (handle)
 822                 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 823
 824 out_unlock:
 825         unlock_page(page);
 826         page_cache_release(page);
 827 out:
 828         return ret;
 829 }
 830
 831 /*
 832  * Find the next range to zero.  We do this in terms of bytes because
 833  * that's what ocfs2_zero_extend() wants, and it is dealing with the
 834  * pagecache.  We may return multiple extents.
 835  *
 836  * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
 837  * needs to be zeroed.  range_start and range_end return the next zeroing
 838  * range.  A subsequent call should pass the previous range_end as its
 839  * zero_start.  If range_end is 0, there's nothing to do.
 840  *
 841  * Unwritten extents are skipped over.  Refcounted extents are CoWd.
 842  */
 843 static int ocfs2_zero_extend_get_range(struct inode *inode,
 844                                        struct buffer_head *di_bh,
 845                                        u64 zero_start, u64 zero_end,
 846                                        u64 *range_start, u64 *range_end)
 847 {
 848         int rc = 0, needs_cow = 0;
 849         u32 p_cpos, zero_clusters = 0;
 850         u32 zero_cpos =
 851                 zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 852         u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
 853         unsigned int num_clusters = 0;
 854         unsigned int ext_flags = 0;
 855
 856         while (zero_cpos < last_cpos) {
 857                 rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
 858                                         &num_clusters, &ext_flags);
 859                 if (rc) {
 860                         mlog_errno(rc);
 861                         goto out;
 862                 }
 863
 864                 if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
 865                         zero_clusters = num_clusters;
 866                         if (ext_flags & OCFS2_EXT_REFCOUNTED)
 867                                 needs_cow = 1;
 868                         break;
 869                 }
 870
 871                 zero_cpos += num_clusters;
 872         }
 873         if (!zero_clusters) {
 874                 *range_end = 0;
 875                 goto out;
 876         }
 877
 878         while ((zero_cpos + zero_clusters) < last_cpos) {
 879                 rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
 880                                         &p_cpos, &num_clusters,
 881                                         &ext_flags);
 882                 if (rc) {
 883                         mlog_errno(rc);
 884                         goto out;
 885                 }
 886
 887                 if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
 888                         break;
 889                 if (ext_flags & OCFS2_EXT_REFCOUNTED)
 890                         needs_cow = 1;
 891                 zero_clusters += num_clusters;
 892         }
 893         if ((zero_cpos + zero_clusters) > last_cpos)
 894                 zero_clusters = last_cpos - zero_cpos;
 895
 896         if (needs_cow) {
 897                 rc = ocfs2_refcount_cow(inode, di_bh, zero_cpos,
 898                                         zero_clusters, UINT_MAX);
 899                 if (rc) {
 900                         mlog_errno(rc);
 901                         goto out;
 902                 }
 903         }
 904
 905         *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
 906         *range_end = ocfs2_clusters_to_bytes(inode->i_sb,
 907                                              zero_cpos + zero_clusters);
 908
 909 out:
 910         return rc;
 911 }
 912
 913 /*
 914  * Zero one range returned from ocfs2_zero_extend_get_range().  The caller
 915  * has made sure that the entire range needs zeroing.
 916  */
 917 static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
 918                                    u64 range_end)
 919 {
 920         int rc = 0;
 921         u64 next_pos;
 922         u64 zero_pos = range_start;
 923
 924         trace_ocfs2_zero_extend_range(
 925                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 926                         (unsigned long long)range_start,
 927                         (unsigned long long)range_end);
 928         BUG_ON(range_start >= range_end);
 929
 930         while (zero_pos < range_end) {
 931                 next_pos = (zero_pos & PAGE_CACHE_MASK) + PAGE_CACHE_SIZE;
 932                 if (next_pos > range_end)
 933                         next_pos = range_end;
 934                 rc = ocfs2_write_zero_page(inode, zero_pos, next_pos);
 935                 if (rc < 0) {
 936                         mlog_errno(rc);
 937                         break;
 938                 }
 939                 zero_pos = next_pos;
 940
 941                 /*
 942                  * Very large extends have the potential to lock up
 943                  * the cpu for extended periods of time.
 944                  */
 945                 cond_resched();
 946         }
 947
 948         return rc;
 949 }
 950
 951 int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
 952                       loff_t zero_to_size)
 953 {
 954         int ret = 0;
 955         u64 zero_start, range_start = 0, range_end = 0;
 956         struct super_block *sb = inode->i_sb;
 957
 958         zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
 959         trace_ocfs2_zero_extend((unsigned long long)OCFS2_I(inode)->ip_blkno,
 960                                 (unsigned long long)zero_start,
 961                                 (unsigned long long)i_size_read(inode));
 962         while (zero_start < zero_to_size) {
 963                 ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
 964                                                   zero_to_size,
 965                                                   &range_start,
 966                                                   &range_end);
 967                 if (ret) {
 968                         mlog_errno(ret);
 969                         break;
 970                 }
 971                 if (!range_end)
 972                         break;
 973                 /* Trim the ends */
 974                 if (range_start < zero_start)
 975                         range_start = zero_start;
 976                 if (range_end > zero_to_size)
 977                         range_end = zero_to_size;
 978
 979                 ret = ocfs2_zero_extend_range(inode, range_start,
 980                                               range_end);
 981                 if (ret) {
 982                         mlog_errno(ret);
 983                         break;
 984                 }
 985                 zero_start = range_end;
 986         }
 987
 988         return ret;
 989 }
 990
 991 int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
 992                           u64 new_i_size, u64 zero_to)
 993 {
 994         int ret;
 995         u32 clusters_to_add;
 996         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 997
 998         /*
 999          * Only quota files call this without a bh, and they can't be
1000          * refcounted.
1001          */
1002         BUG_ON(!di_bh && (oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
1003         BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
1004
1005         clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
1006         if (clusters_to_add < oi->ip_clusters)
1007                 clusters_to_add = 0;
1008         else
1009                 clusters_to_add -= oi->ip_clusters;
1010
1011         if (clusters_to_add) {
1012                 ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
1013                                                 clusters_to_add, 0);
1014                 if (ret) {
1015                         mlog_errno(ret);
1016                         goto out;
1017                 }
1018         }
1019
1020         /*
1021          * Call this even if we don't add any clusters to the tree. We
1022          * still need to zero the area between the old i_size and the
1023          * new i_size.
1024          */
1025         ret = ocfs2_zero_extend(inode, di_bh, zero_to);
1026         if (ret < 0)
1027                 mlog_errno(ret);
1028
1029 out:
1030         return ret;
1031 }
1032
1033 static int ocfs2_extend_file(struct inode *inode,
1034                              struct buffer_head *di_bh,
1035                              u64 new_i_size)
1036 {
1037         int ret = 0;
1038         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1039
1040         BUG_ON(!di_bh);
1041
1042         /* setattr sometimes calls us like this. */
1043         if (new_i_size == 0)
1044                 goto out;
1045
1046         if (i_size_read(inode) == new_i_size)
1047                 goto out;
1048         BUG_ON(new_i_size < i_size_read(inode));
1049
1050         /*
1051          * The alloc sem blocks people in read/write from reading our
1052          * allocation until we're done changing it. We depend on
1053          * i_mutex to block other extend/truncate calls while we're
1054          * here.  We even have to hold it for sparse files because there
1055          * might be some tail zeroing.
1056          */
1057         down_write(&oi->ip_alloc_sem);
1058
1059         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1060                 /*
1061                  * We can optimize small extends by keeping the inodes
1062                  * inline data.
1063                  */
1064                 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1065                         up_write(&oi->ip_alloc_sem);
1066                         goto out_update_size;
1067                 }
1068
1069                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1070                 if (ret) {
1071                         up_write(&oi->ip_alloc_sem);
1072                         mlog_errno(ret);
1073                         goto out;
1074                 }
1075         }
1076
1077         if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1078                 ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1079         else
1080                 ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1081                                             new_i_size);
1082
1083         up_write(&oi->ip_alloc_sem);
1084
1085         if (ret < 0) {
1086                 mlog_errno(ret);
1087                 goto out;
1088         }
1089
1090 out_update_size:
1091         ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1092         if (ret < 0)
1093                 mlog_errno(ret);
1094
1095 out:
1096         return ret;
1097 }
1098
1099 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1100 {
1101         int status = 0, size_change;
1102         struct inode *inode = dentry->d_inode;
1103         struct super_block *sb = inode->i_sb;
1104         struct ocfs2_super *osb = OCFS2_SB(sb);
1105         struct buffer_head *bh = NULL;
1106         handle_t *handle = NULL;
1107         struct dquot *transfer_to[MAXQUOTAS] = { };
1108         int qtype;
1109
1110         trace_ocfs2_setattr(inode, dentry,
1111                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
1112                             dentry->d_name.len, dentry->d_name.name,
1113                             attr->ia_valid, attr->ia_mode,
1114                             from_kuid(&init_user_ns, attr->ia_uid),
1115                             from_kgid(&init_user_ns, attr->ia_gid));
1116
1117         /* ensuring we don't even attempt to truncate a symlink */
1118         if (S_ISLNK(inode->i_mode))
1119                 attr->ia_valid &= ~ATTR_SIZE;
1120
1121 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1122                            | ATTR_GID | ATTR_UID | ATTR_MODE)
1123         if (!(attr->ia_valid & OCFS2_VALID_ATTRS))
1124                 return 0;
1125
1126         status = inode_change_ok(inode, attr);
1127         if (status)
1128                 return status;
1129
1130         if (is_quota_modification(inode, attr))
1131                 dquot_initialize(inode);
1132         size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1133         if (size_change) {
1134                 status = ocfs2_rw_lock(inode, 1);
1135                 if (status < 0) {
1136                         mlog_errno(status);
1137                         goto bail;
1138                 }
1139         }
1140
1141         status = ocfs2_inode_lock(inode, &bh, 1);
1142         if (status < 0) {
1143                 if (status != -ENOENT)
1144                         mlog_errno(status);
1145                 goto bail_unlock_rw;
1146         }
1147
1148         if (size_change && attr->ia_size != i_size_read(inode)) {
1149                 status = inode_newsize_ok(inode, attr->ia_size);
1150                 if (status)
1151                         goto bail_unlock;
1152
1153                 inode_dio_wait(inode);
1154
1155                 if (i_size_read(inode) > attr->ia_size) {
1156                         if (ocfs2_should_order_data(inode)) {
1157                                 status = ocfs2_begin_ordered_truncate(inode,
1158                                                                       attr->ia_size);
1159                                 if (status)
1160                                         goto bail_unlock;
1161                         }
1162                         status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1163                 } else
1164                         status = ocfs2_extend_file(inode, bh, attr->ia_size);
1165                 if (status < 0) {
1166                         if (status != -ENOSPC)
1167                                 mlog_errno(status);
1168                         status = -ENOSPC;
1169                         goto bail_unlock;
1170                 }
1171         }
1172
1173         if ((attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
1174             (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
1175                 /*
1176                  * Gather pointers to quota structures so that allocation /
1177                  * freeing of quota structures happens here and not inside
1178                  * dquot_transfer() where we have problems with lock ordering
1179                  */
1180                 if (attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)
1181                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1182                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1183                         transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(attr->ia_uid));
1184                         if (!transfer_to[USRQUOTA]) {
1185                                 status = -ESRCH;
1186                                 goto bail_unlock;
1187                         }
1188                 }
1189                 if (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid)
1190                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1191                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1192                         transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(attr->ia_gid));
1193                         if (!transfer_to[GRPQUOTA]) {
1194                                 status = -ESRCH;
1195                                 goto bail_unlock;
1196                         }
1197                 }
1198                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1199                                            2 * ocfs2_quota_trans_credits(sb));
1200                 if (IS_ERR(handle)) {
1201                         status = PTR_ERR(handle);
1202                         mlog_errno(status);
1203                         goto bail_unlock;
1204                 }
1205                 status = __dquot_transfer(inode, transfer_to);
1206                 if (status < 0)
1207                         goto bail_commit;
1208         } else {
1209                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1210                 if (IS_ERR(handle)) {
1211                         status = PTR_ERR(handle);
1212                         mlog_errno(status);
1213                         goto bail_unlock;
1214                 }
1215         }
1216
1217         setattr_copy(inode, attr);
1218         mark_inode_dirty(inode);
1219
1220         status = ocfs2_mark_inode_dirty(handle, inode, bh);
1221         if (status < 0)
1222                 mlog_errno(status);
1223
1224 bail_commit:
1225         ocfs2_commit_trans(osb, handle);
1226 bail_unlock:
1227         ocfs2_inode_unlock(inode, 1);
1228 bail_unlock_rw:
1229         if (size_change)
1230                 ocfs2_rw_unlock(inode, 1);
1231 bail:
1232         brelse(bh);
1233
1234         /* Release quota pointers in case we acquired them */
1235         for (qtype = 0; qtype < MAXQUOTAS; qtype++)
1236                 dqput(transfer_to[qtype]);
1237
1238         if (!status && attr->ia_valid & ATTR_MODE) {
1239                 status = posix_acl_chmod(inode, inode->i_mode);
1240                 if (status < 0)
1241                         mlog_errno(status);
1242         }
1243
1244         return status;
1245 }
1246
1247 int ocfs2_getattr(struct vfsmount *mnt,
1248                   struct dentry *dentry,
1249                   struct kstat *stat)
1250 {
1251         struct inode *inode = dentry->d_inode;
1252         struct super_block *sb = dentry->d_inode->i_sb;
1253         struct ocfs2_super *osb = sb->s_fs_info;
1254         int err;
1255
1256         err = ocfs2_inode_revalidate(dentry);
1257         if (err) {
1258                 if (err != -ENOENT)
1259                         mlog_errno(err);
1260                 goto bail;
1261         }
1262
1263         generic_fillattr(inode, stat);
1264
1265         /* We set the blksize from the cluster size for performance */
1266         stat->blksize = osb->s_clustersize;
1267
1268 bail:
1269         return err;
1270 }
1271
1272 int ocfs2_permission(struct inode *inode, int mask)
1273 {
1274         int ret;
1275
1276         if (mask & MAY_NOT_BLOCK)
1277                 return -ECHILD;
1278
1279         ret = ocfs2_inode_lock(inode, NULL, 0);
1280         if (ret) {
1281                 if (ret != -ENOENT)
1282                         mlog_errno(ret);
1283                 goto out;
1284         }
1285
1286         ret = generic_permission(inode, mask);
1287
1288         ocfs2_inode_unlock(inode, 0);
1289 out:
1290         return ret;
1291 }
1292
1293 static int __ocfs2_write_remove_suid(struct inode *inode,
1294                                      struct buffer_head *bh)
1295 {
1296         int ret;
1297         handle_t *handle;
1298         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1299         struct ocfs2_dinode *di;
1300
1301         trace_ocfs2_write_remove_suid(
1302                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1303                         inode->i_mode);
1304
1305         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1306         if (IS_ERR(handle)) {
1307                 ret = PTR_ERR(handle);
1308                 mlog_errno(ret);
1309                 goto out;
1310         }
1311
1312         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1313                                       OCFS2_JOURNAL_ACCESS_WRITE);
1314         if (ret < 0) {
1315                 mlog_errno(ret);
1316                 goto out_trans;
1317         }
1318
1319         inode->i_mode &= ~S_ISUID;
1320         if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1321                 inode->i_mode &= ~S_ISGID;
1322
1323         di = (struct ocfs2_dinode *) bh->b_data;
1324         di->i_mode = cpu_to_le16(inode->i_mode);
1325
1326         ocfs2_journal_dirty(handle, bh);
1327
1328 out_trans:
1329         ocfs2_commit_trans(osb, handle);
1330 out:
1331         return ret;
1332 }
1333
1334 /*
1335  * Will look for holes and unwritten extents in the range starting at
1336  * pos for count bytes (inclusive).
1337  */
1338 static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1339                                        size_t count)
1340 {
1341         int ret = 0;
1342         unsigned int extent_flags;
1343         u32 cpos, clusters, extent_len, phys_cpos;
1344         struct super_block *sb = inode->i_sb;
1345
1346         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1347         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1348
1349         while (clusters) {
1350                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1351                                          &extent_flags);
1352                 if (ret < 0) {
1353                         mlog_errno(ret);
1354                         goto out;
1355                 }
1356
1357                 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1358                         ret = 1;
1359                         break;
1360                 }
1361
1362                 if (extent_len > clusters)
1363                         extent_len = clusters;
1364
1365                 clusters -= extent_len;
1366                 cpos += extent_len;
1367         }
1368 out:
1369         return ret;
1370 }
1371
1372 static int ocfs2_write_remove_suid(struct inode *inode)
1373 {
1374         int ret;
1375         struct buffer_head *bh = NULL;
1376
1377         ret = ocfs2_read_inode_block(inode, &bh);
1378         if (ret < 0) {
1379                 mlog_errno(ret);
1380                 goto out;
1381         }
1382
1383         ret =  __ocfs2_write_remove_suid(inode, bh);
1384 out:
1385         brelse(bh);
1386         return ret;
1387 }
1388
1389 /*
1390  * Allocate enough extents to cover the region starting at byte offset
1391  * start for len bytes. Existing extents are skipped, any extents
1392  * added are marked as "unwritten".
1393  */
1394 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1395                                             u64 start, u64 len)
1396 {
1397         int ret;
1398         u32 cpos, phys_cpos, clusters, alloc_size;
1399         u64 end = start + len;
1400         struct buffer_head *di_bh = NULL;
1401
1402         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1403                 ret = ocfs2_read_inode_block(inode, &di_bh);
1404                 if (ret) {
1405                         mlog_errno(ret);
1406                         goto out;
1407                 }
1408
1409                 /*
1410                  * Nothing to do if the requested reservation range
1411                  * fits within the inode.
1412                  */
1413                 if (ocfs2_size_fits_inline_data(di_bh, end))
1414                         goto out;
1415
1416                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1417                 if (ret) {
1418                         mlog_errno(ret);
1419                         goto out;
1420                 }
1421         }
1422
1423         /*
1424          * We consider both start and len to be inclusive.
1425          */
1426         cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1427         clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1428         clusters -= cpos;
1429
1430         while (clusters) {
1431                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1432                                          &alloc_size, NULL);
1433                 if (ret) {
1434                         mlog_errno(ret);
1435                         goto out;
1436                 }
1437
1438                 /*
1439                  * Hole or existing extent len can be arbitrary, so
1440                  * cap it to our own allocation request.
1441                  */
1442                 if (alloc_size > clusters)
1443                         alloc_size = clusters;
1444
1445                 if (phys_cpos) {
1446                         /*
1447                          * We already have an allocation at this
1448                          * region so we can safely skip it.
1449                          */
1450                         goto next;
1451                 }
1452
1453                 ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1454                 if (ret) {
1455                         if (ret != -ENOSPC)
1456                                 mlog_errno(ret);
1457                         goto out;
1458                 }
1459
1460 next:
1461                 cpos += alloc_size;
1462                 clusters -= alloc_size;
1463         }
1464
1465         ret = 0;
1466 out:
1467
1468         brelse(di_bh);
1469         return ret;
1470 }
1471
1472 /*
1473  * Truncate a byte range, avoiding pages within partial clusters. This
1474  * preserves those pages for the zeroing code to write to.
1475  */
1476 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1477                                          u64 byte_len)
1478 {
1479         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1480         loff_t start, end;
1481         struct address_space *mapping = inode->i_mapping;
1482
1483         start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1484         end = byte_start + byte_len;
1485         end = end & ~(osb->s_clustersize - 1);
1486
1487         if (start < end) {
1488                 unmap_mapping_range(mapping, start, end - start, 0);
1489                 truncate_inode_pages_range(mapping, start, end - 1);
1490         }
1491 }
1492
1493 static int ocfs2_zero_partial_clusters(struct inode *inode,
1494                                        u64 start, u64 len)
1495 {
1496         int ret = 0;
1497         u64 tmpend, end = start + len;
1498         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1499         unsigned int csize = osb->s_clustersize;
1500         handle_t *handle;
1501
1502         /*
1503          * The "start" and "end" values are NOT necessarily part of
1504          * the range whose allocation is being deleted. Rather, this
1505          * is what the user passed in with the request. We must zero
1506          * partial clusters here. There's no need to worry about
1507          * physical allocation - the zeroing code knows to skip holes.
1508          */
1509         trace_ocfs2_zero_partial_clusters(
1510                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1511                 (unsigned long long)start, (unsigned long long)end);
1512
1513         /*
1514          * If both edges are on a cluster boundary then there's no
1515          * zeroing required as the region is part of the allocation to
1516          * be truncated.
1517          */
1518         if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1519                 goto out;
1520
1521         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1522         if (IS_ERR(handle)) {
1523                 ret = PTR_ERR(handle);
1524                 mlog_errno(ret);
1525                 goto out;
1526         }
1527
1528         /*
1529          * We want to get the byte offset of the end of the 1st cluster.
1530          */
1531         tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1532         if (tmpend > end)
1533                 tmpend = end;
1534
1535         trace_ocfs2_zero_partial_clusters_range1((unsigned long long)start,
1536                                                  (unsigned long long)tmpend);
1537
1538         ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1539         if (ret)
1540                 mlog_errno(ret);
1541
1542         if (tmpend < end) {
1543                 /*
1544                  * This may make start and end equal, but the zeroing
1545                  * code will skip any work in that case so there's no
1546                  * need to catch it up here.
1547                  */
1548                 start = end & ~(osb->s_clustersize - 1);
1549
1550                 trace_ocfs2_zero_partial_clusters_range2(
1551                         (unsigned long long)start, (unsigned long long)end);
1552
1553                 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1554                 if (ret)
1555                         mlog_errno(ret);
1556         }
1557
1558         ocfs2_commit_trans(osb, handle);
1559 out:
1560         return ret;
1561 }
1562
1563 static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1564 {
1565         int i;
1566         struct ocfs2_extent_rec *rec = NULL;
1567
1568         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1569
1570                 rec = &el->l_recs[i];
1571
1572                 if (le32_to_cpu(rec->e_cpos) < pos)
1573                         break;
1574         }
1575
1576         return i;
1577 }
1578
1579 /*
1580  * Helper to calculate the punching pos and length in one run, we handle the
1581  * following three cases in order:
1582  *
1583  * - remove the entire record
1584  * - remove a partial record
1585  * - no record needs to be removed (hole-punching completed)
1586 */
1587 static void ocfs2_calc_trunc_pos(struct inode *inode,
1588                                  struct ocfs2_extent_list *el,
1589                                  struct ocfs2_extent_rec *rec,
1590                                  u32 trunc_start, u32 *trunc_cpos,
1591                                  u32 *trunc_len, u32 *trunc_end,
1592                                  u64 *blkno, int *done)
1593 {
1594         int ret = 0;
1595         u32 coff, range;
1596
1597         range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1598
1599         if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1600                 /*
1601                  * remove an entire extent record.
1602                  */
1603                 *trunc_cpos = le32_to_cpu(rec->e_cpos);
1604                 /*
1605                  * Skip holes if any.
1606                  */
1607                 if (range < *trunc_end)
1608                         *trunc_end = range;
1609                 *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1610                 *blkno = le64_to_cpu(rec->e_blkno);
1611                 *trunc_end = le32_to_cpu(rec->e_cpos);
1612         } else if (range > trunc_start) {
1613                 /*
1614                  * remove a partial extent record, which means we're
1615                  * removing the last extent record.
1616                  */
1617                 *trunc_cpos = trunc_start;
1618                 /*
1619                  * skip hole if any.
1620                  */
1621                 if (range < *trunc_end)
1622                         *trunc_end = range;
1623                 *trunc_len = *trunc_end - trunc_start;
1624                 coff = trunc_start - le32_to_cpu(rec->e_cpos);
1625                 *blkno = le64_to_cpu(rec->e_blkno) +
1626                                 ocfs2_clusters_to_blocks(inode->i_sb, coff);
1627                 *trunc_end = trunc_start;
1628         } else {
1629                 /*
1630                  * It may have two following possibilities:
1631                  *
1632                  * - last record has been removed
1633                  * - trunc_start was within a hole
1634                  *
1635                  * both two cases mean the completion of hole punching.
1636                  */
1637                 ret = 1;
1638         }
1639
1640         *done = ret;
1641 }
1642
1643 static int ocfs2_remove_inode_range(struct inode *inode,
1644                                     struct buffer_head *di_bh, u64 byte_start,
1645                                     u64 byte_len)
1646 {
1647         int ret = 0, flags = 0, done = 0, i;
1648         u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1649         u32 cluster_in_el;
1650         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1651         struct ocfs2_cached_dealloc_ctxt dealloc;
1652         struct address_space *mapping = inode->i_mapping;
1653         struct ocfs2_extent_tree et;
1654         struct ocfs2_path *path = NULL;
1655         struct ocfs2_extent_list *el = NULL;
1656         struct ocfs2_extent_rec *rec = NULL;
1657         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1658         u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1659
1660         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1661         ocfs2_init_dealloc_ctxt(&dealloc);
1662
1663         trace_ocfs2_remove_inode_range(
1664                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1665                         (unsigned long long)byte_start,
1666                         (unsigned long long)byte_len);
1667
1668         if (byte_len == 0)
1669                 return 0;
1670
1671         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1672                 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1673                                             byte_start + byte_len, 0);
1674                 if (ret) {
1675                         mlog_errno(ret);
1676                         goto out;
1677                 }
1678                 /*
1679                  * There's no need to get fancy with the page cache
1680                  * truncate of an inline-data inode. We're talking
1681                  * about less than a page here, which will be cached
1682                  * in the dinode buffer anyway.
1683                  */
1684                 unmap_mapping_range(mapping, 0, 0, 0);
1685                 truncate_inode_pages(mapping, 0);
1686                 goto out;
1687         }
1688
1689         /*
1690          * For reflinks, we may need to CoW 2 clusters which might be
1691          * partially zero'd later, if hole's start and end offset were
1692          * within one cluster(means is not exactly aligned to clustersize).
1693          */
1694
1695         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
1696
1697                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1698                 if (ret) {
1699                         mlog_errno(ret);
1700                         goto out;
1701                 }
1702
1703                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1704                 if (ret) {
1705                         mlog_errno(ret);
1706                         goto out;
1707                 }
1708         }
1709
1710         trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1711         trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1712         cluster_in_el = trunc_end;
1713
1714         ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1715         if (ret) {
1716                 mlog_errno(ret);
1717                 goto out;
1718         }
1719
1720         path = ocfs2_new_path_from_et(&et);
1721         if (!path) {
1722                 ret = -ENOMEM;
1723                 mlog_errno(ret);
1724                 goto out;
1725         }
1726
1727         while (trunc_end > trunc_start) {
1728
1729                 ret = ocfs2_find_path(INODE_CACHE(inode), path,
1730                                       cluster_in_el);
1731                 if (ret) {
1732                         mlog_errno(ret);
1733                         goto out;
1734                 }
1735
1736                 el = path_leaf_el(path);
1737
1738                 i = ocfs2_find_rec(el, trunc_end);
1739                 /*
1740                  * Need to go to previous extent block.
1741                  */
1742                 if (i < 0) {
1743                         if (path->p_tree_depth == 0)
1744                                 break;
1745
1746                         ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1747                                                             path,
1748                                                             &cluster_in_el);
1749                         if (ret) {
1750                                 mlog_errno(ret);
1751                                 goto out;
1752                         }
1753
1754                         /*
1755                          * We've reached the leftmost extent block,
1756                          * it's safe to leave.
1757                          */
1758                         if (cluster_in_el == 0)
1759                                 break;
1760
1761                         /*
1762                          * The 'pos' searched for previous extent block is
1763                          * always one cluster less than actual trunc_end.
1764                          */
1765                         trunc_end = cluster_in_el + 1;
1766
1767                         ocfs2_reinit_path(path, 1);
1768
1769                         continue;
1770
1771                 } else
1772                         rec = &el->l_recs[i];
1773
1774                 ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1775                                      &trunc_len, &trunc_end, &blkno, &done);
1776                 if (done)
1777                         break;
1778
1779                 flags = rec->e_flags;
1780                 phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1781
1782                 ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1783                                                phys_cpos, trunc_len, flags,
1784                                                &dealloc, refcount_loc);
1785                 if (ret < 0) {
1786                         mlog_errno(ret);
1787                         goto out;
1788                 }
1789
1790                 cluster_in_el = trunc_end;
1791
1792                 ocfs2_reinit_path(path, 1);
1793         }
1794
1795         ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1796
1797 out:
1798         ocfs2_free_path(path);
1799         ocfs2_schedule_truncate_log_flush(osb, 1);
1800         ocfs2_run_deallocs(osb, &dealloc);
1801
1802         return ret;
1803 }
1804
1805 /*
1806  * Parts of this function taken from xfs_change_file_space()
1807  */
1808 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1809                                      loff_t f_pos, unsigned int cmd,
1810                                      struct ocfs2_space_resv *sr,
1811                                      int change_size)
1812 {
1813         int ret;
1814         s64 llen;
1815         loff_t size;
1816         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1817         struct buffer_head *di_bh = NULL;
1818         handle_t *handle;
1819         unsigned long long max_off = inode->i_sb->s_maxbytes;
1820
1821         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1822                 return -EROFS;
1823
1824         mutex_lock(&inode->i_mutex);
1825
1826         /*
1827          * This prevents concurrent writes on other nodes
1828          */
1829         ret = ocfs2_rw_lock(inode, 1);
1830         if (ret) {
1831                 mlog_errno(ret);
1832                 goto out;
1833         }
1834
1835         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1836         if (ret) {
1837                 mlog_errno(ret);
1838                 goto out_rw_unlock;
1839         }
1840
1841         if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1842                 ret = -EPERM;
1843                 goto out_inode_unlock;
1844         }
1845
1846         switch (sr->l_whence) {
1847         case 0: /*SEEK_SET*/
1848                 break;
1849         case 1: /*SEEK_CUR*/
1850                 sr->l_start += f_pos;
1851                 break;
1852         case 2: /*SEEK_END*/
1853                 sr->l_start += i_size_read(inode);
1854                 break;
1855         default:
1856                 ret = -EINVAL;
1857                 goto out_inode_unlock;
1858         }
1859         sr->l_whence = 0;
1860
1861         llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1862
1863         if (sr->l_start < 0
1864             || sr->l_start > max_off
1865             || (sr->l_start + llen) < 0
1866             || (sr->l_start + llen) > max_off) {
1867                 ret = -EINVAL;
1868                 goto out_inode_unlock;
1869         }
1870         size = sr->l_start + sr->l_len;
1871
1872         if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64 ||
1873             cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) {
1874                 if (sr->l_len <= 0) {
1875                         ret = -EINVAL;
1876                         goto out_inode_unlock;
1877                 }
1878         }
1879
1880         if (file && should_remove_suid(file->f_path.dentry)) {
1881                 ret = __ocfs2_write_remove_suid(inode, di_bh);
1882                 if (ret) {
1883                         mlog_errno(ret);
1884                         goto out_inode_unlock;
1885                 }
1886         }
1887
1888         down_write(&OCFS2_I(inode)->ip_alloc_sem);
1889         switch (cmd) {
1890         case OCFS2_IOC_RESVSP:
1891         case OCFS2_IOC_RESVSP64:
1892                 /*
1893                  * This takes unsigned offsets, but the signed ones we
1894                  * pass have been checked against overflow above.
1895                  */
1896                 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1897                                                        sr->l_len);
1898                 break;
1899         case OCFS2_IOC_UNRESVSP:
1900         case OCFS2_IOC_UNRESVSP64:
1901                 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1902                                                sr->l_len);
1903                 break;
1904         default:
1905                 ret = -EINVAL;
1906         }
1907         up_write(&OCFS2_I(inode)->ip_alloc_sem);
1908         if (ret) {
1909                 mlog_errno(ret);
1910                 goto out_inode_unlock;
1911         }
1912
1913         /*
1914          * We update c/mtime for these changes
1915          */
1916         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1917         if (IS_ERR(handle)) {
1918                 ret = PTR_ERR(handle);
1919                 mlog_errno(ret);
1920                 goto out_inode_unlock;
1921         }
1922
1923         if (change_size && i_size_read(inode) < size)
1924                 i_size_write(inode, size);
1925
1926         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1927         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1928         if (ret < 0)
1929                 mlog_errno(ret);
1930
1931         if (file && (file->f_flags & O_SYNC))
1932                 handle->h_sync = 1;
1933
1934         ocfs2_commit_trans(osb, handle);
1935
1936 out_inode_unlock:
1937         brelse(di_bh);
1938         ocfs2_inode_unlock(inode, 1);
1939 out_rw_unlock:
1940         ocfs2_rw_unlock(inode, 1);
1941
1942 out:
1943         mutex_unlock(&inode->i_mutex);
1944         return ret;
1945 }
1946
1947 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1948                             struct ocfs2_space_resv *sr)
1949 {
1950         struct inode *inode = file_inode(file);
1951         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1952         int ret;
1953
1954         if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1955             !ocfs2_writes_unwritten_extents(osb))
1956                 return -ENOTTY;
1957         else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1958                  !ocfs2_sparse_alloc(osb))
1959                 return -ENOTTY;
1960
1961         if (!S_ISREG(inode->i_mode))
1962                 return -EINVAL;
1963
1964         if (!(file->f_mode & FMODE_WRITE))
1965                 return -EBADF;
1966
1967         ret = mnt_want_write_file(file);
1968         if (ret)
1969                 return ret;
1970         ret = __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1971         mnt_drop_write_file(file);
1972         return ret;
1973 }
1974
1975 static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
1976                             loff_t len)
1977 {
1978         struct inode *inode = file_inode(file);
1979         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1980         struct ocfs2_space_resv sr;
1981         int change_size = 1;
1982         int cmd = OCFS2_IOC_RESVSP64;
1983
1984         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1985                 return -EOPNOTSUPP;
1986         if (!ocfs2_writes_unwritten_extents(osb))
1987                 return -EOPNOTSUPP;
1988
1989         if (mode & FALLOC_FL_KEEP_SIZE)
1990                 change_size = 0;
1991
1992         if (mode & FALLOC_FL_PUNCH_HOLE)
1993                 cmd = OCFS2_IOC_UNRESVSP64;
1994
1995         sr.l_whence = 0;
1996         sr.l_start = (s64)offset;
1997         sr.l_len = (s64)len;
1998
1999         return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
2000                                          change_size);
2001 }
2002
2003 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2004                                    size_t count)
2005 {
2006         int ret = 0;
2007         unsigned int extent_flags;
2008         u32 cpos, clusters, extent_len, phys_cpos;
2009         struct super_block *sb = inode->i_sb;
2010
2011         if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2012             !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
2013             OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2014                 return 0;
2015
2016         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2017         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2018
2019         while (clusters) {
2020                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2021                                          &extent_flags);
2022                 if (ret < 0) {
2023                         mlog_errno(ret);
2024                         goto out;
2025                 }
2026
2027                 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2028                         ret = 1;
2029                         break;
2030                 }
2031
2032                 if (extent_len > clusters)
2033                         extent_len = clusters;
2034
2035                 clusters -= extent_len;
2036                 cpos += extent_len;
2037         }
2038 out:
2039         return ret;
2040 }
2041
2042 static void ocfs2_aiodio_wait(struct inode *inode)
2043 {
2044         wait_queue_head_t *wq = ocfs2_ioend_wq(inode);
2045
2046         wait_event(*wq, (atomic_read(&OCFS2_I(inode)->ip_unaligned_aio) == 0));
2047 }
2048
2049 static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
2050 {
2051         int blockmask = inode->i_sb->s_blocksize - 1;
2052         loff_t final_size = pos + count;
2053
2054         if ((pos & blockmask) || (final_size & blockmask))
2055                 return 1;
2056         return 0;
2057 }
2058
2059 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
2060                                             struct file *file,
2061                                             loff_t pos, size_t count,
2062                                             int *meta_level)
2063 {
2064         int ret;
2065         struct buffer_head *di_bh = NULL;
2066         u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2067         u32 clusters =
2068                 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2069
2070         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2071         if (ret) {
2072                 mlog_errno(ret);
2073                 goto out;
2074         }
2075
2076         *meta_level = 1;
2077
2078         ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
2079         if (ret)
2080                 mlog_errno(ret);
2081 out:
2082         brelse(di_bh);
2083         return ret;
2084 }
2085
2086 static int ocfs2_prepare_inode_for_write(struct file *file,
2087                                          loff_t *ppos,
2088                                          size_t count,
2089                                          int appending,
2090                                          int *direct_io,
2091                                          int *has_refcount)
2092 {
2093         int ret = 0, meta_level = 0;
2094         struct dentry *dentry = file->f_path.dentry;
2095         struct inode *inode = dentry->d_inode;
2096         loff_t saved_pos = 0, end;
2097
2098         /*
2099          * We start with a read level meta lock and only jump to an ex
2100          * if we need to make modifications here.
2101          */
2102         for(;;) {
2103                 ret = ocfs2_inode_lock(inode, NULL, meta_level);
2104                 if (ret < 0) {
2105                         meta_level = -1;
2106                         mlog_errno(ret);
2107                         goto out;
2108                 }
2109
2110                 /* Clear suid / sgid if necessary. We do this here
2111                  * instead of later in the write path because
2112                  * remove_suid() calls ->setattr without any hint that
2113                  * we may have already done our cluster locking. Since
2114                  * ocfs2_setattr() *must* take cluster locks to
2115                  * proceed, this will lead us to recursively lock the
2116                  * inode. There's also the dinode i_size state which
2117                  * can be lost via setattr during extending writes (we
2118                  * set inode->i_size at the end of a write. */
2119                 if (should_remove_suid(dentry)) {
2120                         if (meta_level == 0) {
2121                                 ocfs2_inode_unlock(inode, meta_level);
2122                                 meta_level = 1;
2123                                 continue;
2124                         }
2125
2126                         ret = ocfs2_write_remove_suid(inode);
2127                         if (ret < 0) {
2128                                 mlog_errno(ret);
2129                                 goto out_unlock;
2130                         }
2131                 }
2132
2133                 /* work on a copy of ppos until we're sure that we won't have
2134                  * to recalculate it due to relocking. */
2135                 if (appending)
2136                         saved_pos = i_size_read(inode);
2137                 else
2138                         saved_pos = *ppos;
2139
2140                 end = saved_pos + count;
2141
2142                 ret = ocfs2_check_range_for_refcount(inode, saved_pos, count);
2143                 if (ret == 1) {
2144                         ocfs2_inode_unlock(inode, meta_level);
2145                         meta_level = -1;
2146
2147                         ret = ocfs2_prepare_inode_for_refcount(inode,
2148                                                                file,
2149                                                                saved_pos,
2150                                                                count,
2151                                                                &meta_level);
2152                         if (has_refcount)
2153                                 *has_refcount = 1;
2154                         if (direct_io)
2155                                 *direct_io = 0;
2156                 }
2157
2158                 if (ret < 0) {
2159                         mlog_errno(ret);
2160                         goto out_unlock;
2161                 }
2162
2163                 /*
2164                  * Skip the O_DIRECT checks if we don't need
2165                  * them.
2166                  */
2167                 if (!direct_io || !(*direct_io))
2168                         break;
2169
2170                 /*
2171                  * There's no sane way to do direct writes to an inode
2172                  * with inline data.
2173                  */
2174                 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2175                         *direct_io = 0;
2176                         break;
2177                 }
2178
2179                 /*
2180                  * Allowing concurrent direct writes means
2181                  * i_size changes wouldn't be synchronized, so
2182                  * one node could wind up truncating another
2183                  * nodes writes.
2184                  */
2185                 if (end > i_size_read(inode)) {
2186                         *direct_io = 0;
2187                         break;
2188                 }
2189
2190                 /*
2191                  * We don't fill holes during direct io, so
2192                  * check for them here. If any are found, the
2193                  * caller will have to retake some cluster
2194                  * locks and initiate the io as buffered.
2195                  */
2196                 ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
2197                 if (ret == 1) {
2198                         *direct_io = 0;
2199                         ret = 0;
2200                 } else if (ret < 0)
2201                         mlog_errno(ret);
2202                 break;
2203         }
2204
2205         if (appending)
2206                 *ppos = saved_pos;
2207
2208 out_unlock:
2209         trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
2210                                             saved_pos, appending, count,
2211                                             direct_io, has_refcount);
2212
2213         if (meta_level >= 0)
2214                 ocfs2_inode_unlock(inode, meta_level);
2215
2216 out:
2217         return ret;
2218 }
2219
2220 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
2221                                     const struct iovec *iov,
2222                                     unsigned long nr_segs,
2223                                     loff_t pos)
2224 {
2225         int ret, direct_io, appending, rw_level, have_alloc_sem  = 0;
2226         int can_do_direct, has_refcount = 0;
2227         ssize_t written = 0;
2228         size_t ocount;          /* original count */
2229         size_t count;           /* after file limit checks */
2230         loff_t old_size, *ppos = &iocb->ki_pos;
2231         u32 old_clusters;
2232         struct file *file = iocb->ki_filp;
2233         struct inode *inode = file_inode(file);
2234         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2235         int full_coherency = !(osb->s_mount_opt &
2236                                OCFS2_MOUNT_COHERENCY_BUFFERED);
2237         int unaligned_dio = 0;
2238
2239         trace_ocfs2_file_aio_write(inode, file, file->f_path.dentry,
2240                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
2241                 file->f_path.dentry->d_name.len,
2242                 file->f_path.dentry->d_name.name,
2243                 (unsigned int)nr_segs);
2244
2245         if (iocb->ki_nbytes == 0)
2246                 return 0;
2247
2248         appending = file->f_flags & O_APPEND ? 1 : 0;
2249         direct_io = file->f_flags & O_DIRECT ? 1 : 0;
2250
2251         mutex_lock(&inode->i_mutex);
2252
2253         ocfs2_iocb_clear_sem_locked(iocb);
2254
2255 relock:
2256         /* to match setattr's i_mutex -> rw_lock ordering */
2257         if (direct_io) {
2258                 have_alloc_sem = 1;
2259                 /* communicate with ocfs2_dio_end_io */
2260                 ocfs2_iocb_set_sem_locked(iocb);
2261         }
2262
2263         /*
2264          * Concurrent O_DIRECT writes are allowed with
2265          * mount_option "coherency=buffered".
2266          */
2267         rw_level = (!direct_io || full_coherency);
2268
2269         ret = ocfs2_rw_lock(inode, rw_level);
2270         if (ret < 0) {
2271                 mlog_errno(ret);
2272                 goto out_sems;
2273         }
2274
2275         /*
2276          * O_DIRECT writes with "coherency=full" need to take EX cluster
2277          * inode_lock to guarantee coherency.
2278          */
2279         if (direct_io && full_coherency) {
2280                 /*
2281                  * We need to take and drop the inode lock to force
2282                  * other nodes to drop their caches.  Buffered I/O
2283                  * already does this in write_begin().
2284                  */
2285                 ret = ocfs2_inode_lock(inode, NULL, 1);
2286                 if (ret < 0) {
2287                         mlog_errno(ret);
2288                         goto out;
2289                 }
2290
2291                 ocfs2_inode_unlock(inode, 1);
2292         }
2293
2294         can_do_direct = direct_io;
2295         ret = ocfs2_prepare_inode_for_write(file, ppos,
2296                                             iocb->ki_nbytes, appending,
2297                                             &can_do_direct, &has_refcount);
2298         if (ret < 0) {
2299                 mlog_errno(ret);
2300                 goto out;
2301         }
2302
2303         if (direct_io && !is_sync_kiocb(iocb))
2304                 unaligned_dio = ocfs2_is_io_unaligned(inode, iocb->ki_nbytes,
2305                                                       *ppos);
2306
2307         /*
2308          * We can't complete the direct I/O as requested, fall back to
2309          * buffered I/O.
2310          */
2311         if (direct_io && !can_do_direct) {
2312                 ocfs2_rw_unlock(inode, rw_level);
2313
2314                 have_alloc_sem = 0;
2315                 rw_level = -1;
2316
2317                 direct_io = 0;
2318                 goto relock;
2319         }
2320
2321         if (unaligned_dio) {
2322                 /*
2323                  * Wait on previous unaligned aio to complete before
2324                  * proceeding.
2325                  */
2326                 ocfs2_aiodio_wait(inode);
2327
2328                 /* Mark the iocb as needing a decrement in ocfs2_dio_end_io */
2329                 atomic_inc(&OCFS2_I(inode)->ip_unaligned_aio);
2330                 ocfs2_iocb_set_unaligned_aio(iocb);
2331         }
2332
2333         /*
2334          * To later detect whether a journal commit for sync writes is
2335          * necessary, we sample i_size, and cluster count here.
2336          */
2337         old_size = i_size_read(inode);
2338         old_clusters = OCFS2_I(inode)->ip_clusters;
2339
2340         /* communicate with ocfs2_dio_end_io */
2341         ocfs2_iocb_set_rw_locked(iocb, rw_level);
2342
2343         ret = generic_segment_checks(iov, &nr_segs, &ocount,
2344                                      VERIFY_READ);
2345         if (ret)
2346                 goto out_dio;
2347
2348         count = ocount;
2349         ret = generic_write_checks(file, ppos, &count,
2350                                    S_ISBLK(inode->i_mode));
2351         if (ret)
2352                 goto out_dio;
2353
2354         if (direct_io) {
2355                 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
2356                                                     ppos, count, ocount);
2357                 if (written < 0) {
2358                         ret = written;
2359                         goto out_dio;
2360                 }
2361         } else {
2362                 current->backing_dev_info = file->f_mapping->backing_dev_info;
2363                 written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos,
2364                                                       ppos, count, 0);
2365                 current->backing_dev_info = NULL;
2366         }
2367
2368 out_dio:
2369         /* buffered aio wouldn't have proper lock coverage today */
2370         BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2371
2372         if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
2373             ((file->f_flags & O_DIRECT) && !direct_io)) {
2374                 ret = filemap_fdatawrite_range(file->f_mapping, pos,
2375                                                pos + count - 1);
2376                 if (ret < 0)
2377                         written = ret;
2378
2379                 if (!ret && ((old_size != i_size_read(inode)) ||
2380                              (old_clusters != OCFS2_I(inode)->ip_clusters) ||
2381                              has_refcount)) {
2382                         ret = jbd2_journal_force_commit(osb->journal->j_journal);
2383                         if (ret < 0)
2384                                 written = ret;
2385                 }
2386
2387                 if (!ret)
2388                         ret = filemap_fdatawait_range(file->f_mapping, pos,
2389                                                       pos + count - 1);
2390         }
2391
2392         /*
2393          * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2394          * function pointer which is called when o_direct io completes so that
2395          * it can unlock our rw lock.
2396          * Unfortunately there are error cases which call end_io and others
2397          * that don't.  so we don't have to unlock the rw_lock if either an
2398          * async dio is going to do it in the future or an end_io after an
2399          * error has already done it.
2400          */
2401         if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2402                 rw_level = -1;
2403                 have_alloc_sem = 0;
2404                 unaligned_dio = 0;
2405         }
2406
2407         if (unaligned_dio) {
2408                 ocfs2_iocb_clear_unaligned_aio(iocb);
2409                 atomic_dec(&OCFS2_I(inode)->ip_unaligned_aio);
2410         }
2411
2412 out:
2413         if (rw_level != -1)
2414                 ocfs2_rw_unlock(inode, rw_level);
2415
2416 out_sems:
2417         if (have_alloc_sem)
2418                 ocfs2_iocb_clear_sem_locked(iocb);
2419
2420         mutex_unlock(&inode->i_mutex);
2421
2422         if (written)
2423                 ret = written;
2424         return ret;
2425 }
2426
2427 static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
2428                                 struct file *out,
2429                                 struct splice_desc *sd)
2430 {
2431         int ret;
2432
2433         ret = ocfs2_prepare_inode_for_write(out, &sd->pos,
2434                                             sd->total_len, 0, NULL, NULL);
2435         if (ret < 0) {
2436                 mlog_errno(ret);
2437                 return ret;
2438         }
2439
2440         return splice_from_pipe_feed(pipe, sd, pipe_to_file);
2441 }
2442
2443 static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2444                                        struct file *out,
2445                                        loff_t *ppos,
2446                                        size_t len,
2447                                        unsigned int flags)
2448 {
2449         int ret;
2450         struct address_space *mapping = out->f_mapping;
2451         struct inode *inode = mapping->host;
2452         struct splice_desc sd = {
2453                 .total_len = len,
2454                 .flags = flags,
2455                 .pos = *ppos,
2456                 .u.file = out,
2457         };
2458
2459
2460         trace_ocfs2_file_splice_write(inode, out, out->f_path.dentry,
2461                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2462                         out->f_path.dentry->d_name.len,
2463                         out->f_path.dentry->d_name.name, len);
2464
2465         pipe_lock(pipe);
2466
2467         splice_from_pipe_begin(&sd);
2468         do {
2469                 ret = splice_from_pipe_next(pipe, &sd);
2470                 if (ret <= 0)
2471                         break;
2472
2473                 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2474                 ret = ocfs2_rw_lock(inode, 1);
2475                 if (ret < 0)
2476                         mlog_errno(ret);
2477                 else {
2478                         ret = ocfs2_splice_to_file(pipe, out, &sd);
2479                         ocfs2_rw_unlock(inode, 1);
2480                 }
2481                 mutex_unlock(&inode->i_mutex);
2482         } while (ret > 0);
2483         splice_from_pipe_end(pipe, &sd);
2484
2485         pipe_unlock(pipe);
2486
2487         if (sd.num_spliced)
2488                 ret = sd.num_spliced;
2489
2490         if (ret > 0) {
2491                 int err;
2492
2493                 err = generic_write_sync(out, *ppos, ret);
2494                 if (err)
2495                         ret = err;
2496                 else
2497                         *ppos += ret;
2498
2499                 balance_dirty_pages_ratelimited(mapping);
2500         }
2501
2502         return ret;
2503 }
2504
2505 static ssize_t ocfs2_file_splice_read(struct file *in,
2506                                       loff_t *ppos,
2507                                       struct pipe_inode_info *pipe,
2508                                       size_t len,
2509                                       unsigned int flags)
2510 {
2511         int ret = 0, lock_level = 0;
2512         struct inode *inode = file_inode(in);
2513
2514         trace_ocfs2_file_splice_read(inode, in, in->f_path.dentry,
2515                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2516                         in->f_path.dentry->d_name.len,
2517                         in->f_path.dentry->d_name.name, len);
2518
2519         /*
2520          * See the comment in ocfs2_file_aio_read()
2521          */
2522         ret = ocfs2_inode_lock_atime(inode, in->f_path.mnt, &lock_level);
2523         if (ret < 0) {
2524                 mlog_errno(ret);
2525                 goto bail;
2526         }
2527         ocfs2_inode_unlock(inode, lock_level);
2528
2529         ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2530
2531 bail:
2532         return ret;
2533 }
2534
2535 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2536                                    const struct iovec *iov,
2537                                    unsigned long nr_segs,
2538                                    loff_t pos)
2539 {
2540         int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2541         struct file *filp = iocb->ki_filp;
2542         struct inode *inode = file_inode(filp);
2543
2544         trace_ocfs2_file_aio_read(inode, filp, filp->f_path.dentry,
2545                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2546                         filp->f_path.dentry->d_name.len,
2547                         filp->f_path.dentry->d_name.name, nr_segs);
2548
2549
2550         if (!inode) {
2551                 ret = -EINVAL;
2552                 mlog_errno(ret);
2553                 goto bail;
2554         }
2555
2556         ocfs2_iocb_clear_sem_locked(iocb);
2557
2558         /*
2559          * buffered reads protect themselves in ->readpage().  O_DIRECT reads
2560          * need locks to protect pending reads from racing with truncate.
2561          */
2562         if (filp->f_flags & O_DIRECT) {
2563                 have_alloc_sem = 1;
2564                 ocfs2_iocb_set_sem_locked(iocb);
2565
2566                 ret = ocfs2_rw_lock(inode, 0);
2567                 if (ret < 0) {
2568                         mlog_errno(ret);
2569                         goto bail;
2570                 }
2571                 rw_level = 0;
2572                 /* communicate with ocfs2_dio_end_io */
2573                 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2574         }
2575
2576         /*
2577          * We're fine letting folks race truncates and extending
2578          * writes with read across the cluster, just like they can
2579          * locally. Hence no rw_lock during read.
2580          *
2581          * Take and drop the meta data lock to update inode fields
2582          * like i_size. This allows the checks down below
2583          * generic_file_aio_read() a chance of actually working.
2584          */
2585         ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level);
2586         if (ret < 0) {
2587                 mlog_errno(ret);
2588                 goto bail;
2589         }
2590         ocfs2_inode_unlock(inode, lock_level);
2591
2592         ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2593         trace_generic_file_aio_read_ret(ret);
2594
2595         /* buffered aio wouldn't have proper lock coverage today */
2596         BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2597
2598         /* see ocfs2_file_aio_write */
2599         if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2600                 rw_level = -1;
2601                 have_alloc_sem = 0;
2602         }
2603
2604 bail:
2605         if (have_alloc_sem)
2606                 ocfs2_iocb_clear_sem_locked(iocb);
2607
2608         if (rw_level != -1)
2609                 ocfs2_rw_unlock(inode, rw_level);
2610
2611         return ret;
2612 }
2613
2614 /* Refer generic_file_llseek_unlocked() */
2615 static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int whence)
2616 {
2617         struct inode *inode = file->f_mapping->host;
2618         int ret = 0;
2619
2620         mutex_lock(&inode->i_mutex);
2621
2622         switch (whence) {
2623         case SEEK_SET:
2624                 break;
2625         case SEEK_END:
2626                 offset += inode->i_size;
2627                 break;
2628         case SEEK_CUR:
2629                 if (offset == 0) {
2630                         offset = file->f_pos;
2631                         goto out;
2632                 }
2633                 offset += file->f_pos;
2634                 break;
2635         case SEEK_DATA:
2636         case SEEK_HOLE:
2637                 ret = ocfs2_seek_data_hole_offset(file, &offset, whence);
2638                 if (ret)
2639                         goto out;
2640                 break;
2641         default:
2642                 ret = -EINVAL;
2643                 goto out;
2644         }
2645
2646         offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
2647
2648 out:
2649         mutex_unlock(&inode->i_mutex);
2650         if (ret)
2651                 return ret;
2652         return offset;
2653 }
2654
2655 const struct inode_operations ocfs2_file_iops = {
2656         .setattr        = ocfs2_setattr,
2657         .getattr        = ocfs2_getattr,
2658         .permission     = ocfs2_permission,
2659         .setxattr       = generic_setxattr,
2660         .getxattr       = generic_getxattr,
2661         .listxattr      = ocfs2_listxattr,
2662         .removexattr    = generic_removexattr,
2663         .fiemap         = ocfs2_fiemap,
2664         .get_acl        = ocfs2_iop_get_acl,
2665         .set_acl        = ocfs2_iop_set_acl,
2666 };
2667
2668 const struct inode_operations ocfs2_special_file_iops = {
2669         .setattr        = ocfs2_setattr,
2670         .getattr        = ocfs2_getattr,
2671         .permission     = ocfs2_permission,
2672         .get_acl        = ocfs2_iop_get_acl,
2673         .set_acl        = ocfs2_iop_set_acl,
2674 };
2675
2676 /*
2677  * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2678  * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2679  */
2680 const struct file_operations ocfs2_fops = {
2681         .llseek         = ocfs2_file_llseek,
2682         .read           = do_sync_read,
2683         .write          = do_sync_write,
2684         .mmap           = ocfs2_mmap,
2685         .fsync          = ocfs2_sync_file,
2686         .release        = ocfs2_file_release,
2687         .open           = ocfs2_file_open,
2688         .aio_read       = ocfs2_file_aio_read,
2689         .aio_write      = ocfs2_file_aio_write,
2690         .unlocked_ioctl = ocfs2_ioctl,
2691 #ifdef CONFIG_COMPAT
2692         .compat_ioctl   = ocfs2_compat_ioctl,
2693 #endif
2694         .lock           = ocfs2_lock,
2695         .flock          = ocfs2_flock,
2696         .splice_read    = ocfs2_file_splice_read,
2697         .splice_write   = ocfs2_file_splice_write,
2698         .fallocate      = ocfs2_fallocate,
2699 };
2700
2701 const struct file_operations ocfs2_dops = {
2702         .llseek         = generic_file_llseek,
2703         .read           = generic_read_dir,
2704         .iterate        = ocfs2_readdir,
2705         .fsync          = ocfs2_sync_file,
2706         .release        = ocfs2_dir_release,
2707         .open           = ocfs2_dir_open,
2708         .unlocked_ioctl = ocfs2_ioctl,
2709 #ifdef CONFIG_COMPAT
2710         .compat_ioctl   = ocfs2_compat_ioctl,
2711 #endif
2712         .lock           = ocfs2_lock,
2713         .flock          = ocfs2_flock,
2714 };
2715
2716 /*
2717  * POSIX-lockless variants of our file_operations.
2718  *
2719  * These will be used if the underlying cluster stack does not support
2720  * posix file locking, if the user passes the "localflocks" mount
2721  * option, or if we have a local-only fs.
2722  *
2723  * ocfs2_flock is in here because all stacks handle UNIX file locks,
2724  * so we still want it in the case of no stack support for
2725  * plocks. Internally, it will do the right thing when asked to ignore
2726  * the cluster.
2727  */
2728 const struct file_operations ocfs2_fops_no_plocks = {
2729         .llseek         = ocfs2_file_llseek,
2730         .read           = do_sync_read,
2731         .write          = do_sync_write,
2732         .mmap           = ocfs2_mmap,
2733         .fsync          = ocfs2_sync_file,
2734         .release        = ocfs2_file_release,
2735         .open           = ocfs2_file_open,
2736         .aio_read       = ocfs2_file_aio_read,
2737         .aio_write      = ocfs2_file_aio_write,
2738         .unlocked_ioctl = ocfs2_ioctl,
2739 #ifdef CONFIG_COMPAT
2740         .compat_ioctl   = ocfs2_compat_ioctl,
2741 #endif
2742         .flock          = ocfs2_flock,
2743         .splice_read    = ocfs2_file_splice_read,
2744         .splice_write   = ocfs2_file_splice_write,
2745         .fallocate      = ocfs2_fallocate,
2746 };
2747
2748 const struct file_operations ocfs2_dops_no_plocks = {
2749         .llseek         = generic_file_llseek,
2750         .read           = generic_read_dir,
2751         .iterate        = ocfs2_readdir,
2752         .fsync          = ocfs2_sync_file,
2753         .release        = ocfs2_dir_release,
2754         .open           = ocfs2_dir_open,
2755         .unlocked_ioctl = ocfs2_ioctl,
2756 #ifdef CONFIG_COMPAT
2757         .compat_ioctl   = ocfs2_compat_ioctl,
2758 #endif
2759         .flock          = ocfs2_flock,
2760 };