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 #define MLOG_MASK_PREFIX ML_INODE
  42 #include <cluster/masklog.h>
  43
  44 #include "ocfs2.h"
  45
  46 #include "alloc.h"
  47 #include "aops.h"
  48 #include "dir.h"
  49 #include "dlmglue.h"
  50 #include "extent_map.h"
  51 #include "file.h"
  52 #include "sysfile.h"
  53 #include "inode.h"
  54 #include "ioctl.h"
  55 #include "journal.h"
  56 #include "locks.h"
  57 #include "mmap.h"
  58 #include "suballoc.h"
  59 #include "super.h"
  60 #include "xattr.h"
  61 #include "acl.h"
  62 #include "quota.h"
  63 #include "refcounttree.h"
  64
  65 #include "buffer_head_io.h"
  66
  67 static int ocfs2_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         mlog(0, "(0x%p, 0x%p, '%.*s')\n", inode, file,
 103              file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name);
 104
 105         if (file->f_mode & FMODE_WRITE)
 106                 dquot_initialize(inode);
 107
 108         spin_lock(&oi->ip_lock);
 109
 110         /* Check that the inode hasn't been wiped from disk by another
 111          * node. If it hasn't then we're safe as long as we hold the
 112          * spin lock until our increment of open count. */
 113         if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
 114                 spin_unlock(&oi->ip_lock);
 115
 116                 status = -ENOENT;
 117                 goto leave;
 118         }
 119
 120         if (mode & O_DIRECT)
 121                 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
 122
 123         oi->ip_open_count++;
 124         spin_unlock(&oi->ip_lock);
 125
 126         status = ocfs2_init_file_private(inode, file);
 127         if (status) {
 128                 /*
 129                  * We want to set open count back if we're failing the
 130                  * open.
 131                  */
 132                 spin_lock(&oi->ip_lock);
 133                 oi->ip_open_count--;
 134                 spin_unlock(&oi->ip_lock);
 135         }
 136
 137 leave:
 138         mlog_exit(status);
 139         return status;
 140 }
 141
 142 static int ocfs2_file_release(struct inode *inode, struct file *file)
 143 {
 144         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 145
 146         mlog(0, "(0x%p, 0x%p, '%.*s')\n", inode, file,
 147              file->f_path.dentry->d_name.len,
 148              file->f_path.dentry->d_name.name);
 149
 150         spin_lock(&oi->ip_lock);
 151         if (!--oi->ip_open_count)
 152                 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
 153         spin_unlock(&oi->ip_lock);
 154
 155         ocfs2_free_file_private(inode, file);
 156
 157         mlog_exit(0);
 158
 159         return 0;
 160 }
 161
 162 static int ocfs2_dir_open(struct inode *inode, struct file *file)
 163 {
 164         return ocfs2_init_file_private(inode, file);
 165 }
 166
 167 static int ocfs2_dir_release(struct inode *inode, struct file *file)
 168 {
 169         ocfs2_free_file_private(inode, file);
 170         return 0;
 171 }
 172
 173 static int ocfs2_sync_file(struct file *file, int datasync)
 174 {
 175         int err = 0;
 176         journal_t *journal;
 177         struct inode *inode = file->f_mapping->host;
 178         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 179
 180         mlog(0, "(0x%p, %d, 0x%p, '%.*s')\n", file, datasync,
 181              file->f_path.dentry, file->f_path.dentry->d_name.len,
 182              file->f_path.dentry->d_name.name);
 183
 184         if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) {
 185                 /*
 186                  * We still have to flush drive's caches to get data to the
 187                  * platter
 188                  */
 189                 if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
 190                         blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
 191                 goto bail;
 192         }
 193
 194         journal = osb->journal->j_journal;
 195         err = jbd2_journal_force_commit(journal);
 196
 197 bail:
 198         mlog_exit(err);
 199
 200         return (err < 0) ? -EIO : 0;
 201 }
 202
 203 int ocfs2_should_update_atime(struct inode *inode,
 204                               struct vfsmount *vfsmnt)
 205 {
 206         struct timespec now;
 207         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 208
 209         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 210                 return 0;
 211
 212         if ((inode->i_flags & S_NOATIME) ||
 213             ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
 214                 return 0;
 215
 216         /*
 217          * We can be called with no vfsmnt structure - NFSD will
 218          * sometimes do this.
 219          *
 220          * Note that our action here is different than touch_atime() -
 221          * if we can't tell whether this is a noatime mount, then we
 222          * don't know whether to trust the value of s_atime_quantum.
 223          */
 224         if (vfsmnt == NULL)
 225                 return 0;
 226
 227         if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
 228             ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 229                 return 0;
 230
 231         if (vfsmnt->mnt_flags & MNT_RELATIME) {
 232                 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
 233                     (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
 234                         return 1;
 235
 236                 return 0;
 237         }
 238
 239         now = CURRENT_TIME;
 240         if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
 241                 return 0;
 242         else
 243                 return 1;
 244 }
 245
 246 int ocfs2_update_inode_atime(struct inode *inode,
 247                              struct buffer_head *bh)
 248 {
 249         int ret;
 250         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 251         handle_t *handle;
 252         struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
 253
 254         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 255         if (IS_ERR(handle)) {
 256                 ret = PTR_ERR(handle);
 257                 mlog_errno(ret);
 258                 goto out;
 259         }
 260
 261         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 262                                       OCFS2_JOURNAL_ACCESS_WRITE);
 263         if (ret) {
 264                 mlog_errno(ret);
 265                 goto out_commit;
 266         }
 267
 268         /*
 269          * Don't use ocfs2_mark_inode_dirty() here as we don't always
 270          * have i_mutex to guard against concurrent changes to other
 271          * inode fields.
 272          */
 273         inode->i_atime = CURRENT_TIME;
 274         di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 275         di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 276         ocfs2_journal_dirty(handle, bh);
 277
 278 out_commit:
 279         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 280 out:
 281         mlog_exit(ret);
 282         return ret;
 283 }
 284
 285 static int ocfs2_set_inode_size(handle_t *handle,
 286                                 struct inode *inode,
 287                                 struct buffer_head *fe_bh,
 288                                 u64 new_i_size)
 289 {
 290         int status;
 291
 292         i_size_write(inode, new_i_size);
 293         inode->i_blocks = ocfs2_inode_sector_count(inode);
 294         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 295
 296         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 297         if (status < 0) {
 298                 mlog_errno(status);
 299                 goto bail;
 300         }
 301
 302 bail:
 303         mlog_exit(status);
 304         return status;
 305 }
 306
 307 int ocfs2_simple_size_update(struct inode *inode,
 308                              struct buffer_head *di_bh,
 309                              u64 new_i_size)
 310 {
 311         int ret;
 312         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 313         handle_t *handle = NULL;
 314
 315         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 316         if (IS_ERR(handle)) {
 317                 ret = PTR_ERR(handle);
 318                 mlog_errno(ret);
 319                 goto out;
 320         }
 321
 322         ret = ocfs2_set_inode_size(handle, inode, di_bh,
 323                                    new_i_size);
 324         if (ret < 0)
 325                 mlog_errno(ret);
 326
 327         ocfs2_commit_trans(osb, handle);
 328 out:
 329         return ret;
 330 }
 331
 332 static int ocfs2_cow_file_pos(struct inode *inode,
 333                               struct buffer_head *fe_bh,
 334                               u64 offset)
 335 {
 336         int status;
 337         u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 338         unsigned int num_clusters = 0;
 339         unsigned int ext_flags = 0;
 340
 341         /*
 342          * If the new offset is aligned to the range of the cluster, there is
 343          * no space for ocfs2_zero_range_for_truncate to fill, so no need to
 344          * CoW either.
 345          */
 346         if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
 347                 return 0;
 348
 349         status = ocfs2_get_clusters(inode, cpos, &phys,
 350                                     &num_clusters, &ext_flags);
 351         if (status) {
 352                 mlog_errno(status);
 353                 goto out;
 354         }
 355
 356         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
 357                 goto out;
 358
 359         return ocfs2_refcount_cow(inode, NULL, fe_bh, cpos, 1, cpos+1);
 360
 361 out:
 362         return status;
 363 }
 364
 365 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
 366                                      struct inode *inode,
 367                                      struct buffer_head *fe_bh,
 368                                      u64 new_i_size)
 369 {
 370         int status;
 371         handle_t *handle;
 372         struct ocfs2_dinode *di;
 373         u64 cluster_bytes;
 374
 375         /*
 376          * We need to CoW the cluster contains the offset if it is reflinked
 377          * since we will call ocfs2_zero_range_for_truncate later which will
 378          * write "0" from offset to the end of the cluster.
 379          */
 380         status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
 381         if (status) {
 382                 mlog_errno(status);
 383                 return status;
 384         }
 385
 386         /* TODO: This needs to actually orphan the inode in this
 387          * transaction. */
 388
 389         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 390         if (IS_ERR(handle)) {
 391                 status = PTR_ERR(handle);
 392                 mlog_errno(status);
 393                 goto out;
 394         }
 395
 396         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 397                                          OCFS2_JOURNAL_ACCESS_WRITE);
 398         if (status < 0) {
 399                 mlog_errno(status);
 400                 goto out_commit;
 401         }
 402
 403         /*
 404          * Do this before setting i_size.
 405          */
 406         cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
 407         status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
 408                                                cluster_bytes);
 409         if (status) {
 410                 mlog_errno(status);
 411                 goto out_commit;
 412         }
 413
 414         i_size_write(inode, new_i_size);
 415         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 416
 417         di = (struct ocfs2_dinode *) fe_bh->b_data;
 418         di->i_size = cpu_to_le64(new_i_size);
 419         di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
 420         di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 421
 422         ocfs2_journal_dirty(handle, fe_bh);
 423
 424 out_commit:
 425         ocfs2_commit_trans(osb, handle);
 426 out:
 427
 428         mlog_exit(status);
 429         return status;
 430 }
 431
 432 static int ocfs2_truncate_file(struct inode *inode,
 433                                struct buffer_head *di_bh,
 434                                u64 new_i_size)
 435 {
 436         int status = 0;
 437         struct ocfs2_dinode *fe = NULL;
 438         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 439
 440         mlog(0, "(inode = %llu, new_i_size = %llu\n",
 441              (unsigned long long)OCFS2_I(inode)->ip_blkno,
 442              (unsigned long long)new_i_size);
 443
 444         /* We trust di_bh because it comes from ocfs2_inode_lock(), which
 445          * already validated it */
 446         fe = (struct ocfs2_dinode *) di_bh->b_data;
 447
 448         mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
 449                         "Inode %llu, inode i_size = %lld != di "
 450                         "i_size = %llu, i_flags = 0x%x\n",
 451                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 452                         i_size_read(inode),
 453                         (unsigned long long)le64_to_cpu(fe->i_size),
 454                         le32_to_cpu(fe->i_flags));
 455
 456         if (new_i_size > le64_to_cpu(fe->i_size)) {
 457                 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
 458                      (unsigned long long)le64_to_cpu(fe->i_size),
 459                      (unsigned long long)new_i_size);
 460                 status = -EINVAL;
 461                 mlog_errno(status);
 462                 goto bail;
 463         }
 464
 465         mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
 466              (unsigned long long)le64_to_cpu(fe->i_blkno),
 467              (unsigned long long)le64_to_cpu(fe->i_size),
 468              (unsigned long long)new_i_size);
 469
 470         /* lets handle the simple truncate cases before doing any more
 471          * cluster locking. */
 472         if (new_i_size == le64_to_cpu(fe->i_size))
 473                 goto bail;
 474
 475         down_write(&OCFS2_I(inode)->ip_alloc_sem);
 476
 477         ocfs2_resv_discard(&osb->osb_la_resmap,
 478                            &OCFS2_I(inode)->ip_la_data_resv);
 479
 480         /*
 481          * The inode lock forced other nodes to sync and drop their
 482          * pages, which (correctly) happens even if we have a truncate
 483          * without allocation change - ocfs2 cluster sizes can be much
 484          * greater than page size, so we have to truncate them
 485          * anyway.
 486          */
 487         unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
 488         truncate_inode_pages(inode->i_mapping, new_i_size);
 489
 490         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
 491                 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
 492                                                i_size_read(inode), 1);
 493                 if (status)
 494                         mlog_errno(status);
 495
 496                 goto bail_unlock_sem;
 497         }
 498
 499         /* alright, we're going to need to do a full blown alloc size
 500          * change. Orphan the inode so that recovery can complete the
 501          * truncate if necessary. This does the task of marking
 502          * i_size. */
 503         status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
 504         if (status < 0) {
 505                 mlog_errno(status);
 506                 goto bail_unlock_sem;
 507         }
 508
 509         status = ocfs2_commit_truncate(osb, inode, di_bh);
 510         if (status < 0) {
 511                 mlog_errno(status);
 512                 goto bail_unlock_sem;
 513         }
 514
 515         /* TODO: orphan dir cleanup here. */
 516 bail_unlock_sem:
 517         up_write(&OCFS2_I(inode)->ip_alloc_sem);
 518
 519 bail:
 520         if (!status && OCFS2_I(inode)->ip_clusters == 0)
 521                 status = ocfs2_try_remove_refcount_tree(inode, di_bh);
 522
 523         mlog_exit(status);
 524         return status;
 525 }
 526
 527 /*
 528  * extend file allocation only here.
 529  * we'll update all the disk stuff, and oip->alloc_size
 530  *
 531  * expect stuff to be locked, a transaction started and enough data /
 532  * metadata reservations in the contexts.
 533  *
 534  * Will return -EAGAIN, and a reason if a restart is needed.
 535  * If passed in, *reason will always be set, even in error.
 536  */
 537 int ocfs2_add_inode_data(struct ocfs2_super *osb,
 538                          struct inode *inode,
 539                          u32 *logical_offset,
 540                          u32 clusters_to_add,
 541                          int mark_unwritten,
 542                          struct buffer_head *fe_bh,
 543                          handle_t *handle,
 544                          struct ocfs2_alloc_context *data_ac,
 545                          struct ocfs2_alloc_context *meta_ac,
 546                          enum ocfs2_alloc_restarted *reason_ret)
 547 {
 548         int ret;
 549         struct ocfs2_extent_tree et;
 550
 551         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
 552         ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
 553                                           clusters_to_add, mark_unwritten,
 554                                           data_ac, meta_ac, reason_ret);
 555
 556         return ret;
 557 }
 558
 559 static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
 560                                      u32 clusters_to_add, int mark_unwritten)
 561 {
 562         int status = 0;
 563         int restart_func = 0;
 564         int credits;
 565         u32 prev_clusters;
 566         struct buffer_head *bh = NULL;
 567         struct ocfs2_dinode *fe = NULL;
 568         handle_t *handle = NULL;
 569         struct ocfs2_alloc_context *data_ac = NULL;
 570         struct ocfs2_alloc_context *meta_ac = NULL;
 571         enum ocfs2_alloc_restarted why;
 572         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 573         struct ocfs2_extent_tree et;
 574         int did_quota = 0;
 575
 576         mlog(0, "(clusters_to_add = %u)\n", clusters_to_add);
 577
 578         /*
 579          * This function only exists for file systems which don't
 580          * support holes.
 581          */
 582         BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
 583
 584         status = ocfs2_read_inode_block(inode, &bh);
 585         if (status < 0) {
 586                 mlog_errno(status);
 587                 goto leave;
 588         }
 589         fe = (struct ocfs2_dinode *) bh->b_data;
 590
 591 restart_all:
 592         BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
 593
 594         mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
 595              "clusters_to_add = %u\n",
 596              (unsigned long long)OCFS2_I(inode)->ip_blkno,
 597              (long long)i_size_read(inode), le32_to_cpu(fe->i_clusters),
 598              clusters_to_add);
 599         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
 600         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 601                                        &data_ac, &meta_ac);
 602         if (status) {
 603                 mlog_errno(status);
 604                 goto leave;
 605         }
 606
 607         credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list,
 608                                             clusters_to_add);
 609         handle = ocfs2_start_trans(osb, credits);
 610         if (IS_ERR(handle)) {
 611                 status = PTR_ERR(handle);
 612                 handle = NULL;
 613                 mlog_errno(status);
 614                 goto leave;
 615         }
 616
 617 restarted_transaction:
 618         status = dquot_alloc_space_nodirty(inode,
 619                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 620         if (status)
 621                 goto leave;
 622         did_quota = 1;
 623
 624         /* reserve a write to the file entry early on - that we if we
 625          * run out of credits in the allocation path, we can still
 626          * update i_size. */
 627         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 628                                          OCFS2_JOURNAL_ACCESS_WRITE);
 629         if (status < 0) {
 630                 mlog_errno(status);
 631                 goto leave;
 632         }
 633
 634         prev_clusters = OCFS2_I(inode)->ip_clusters;
 635
 636         status = ocfs2_add_inode_data(osb,
 637                                       inode,
 638                                       &logical_start,
 639                                       clusters_to_add,
 640                                       mark_unwritten,
 641                                       bh,
 642                                       handle,
 643                                       data_ac,
 644                                       meta_ac,
 645                                       &why);
 646         if ((status < 0) && (status != -EAGAIN)) {
 647                 if (status != -ENOSPC)
 648                         mlog_errno(status);
 649                 goto leave;
 650         }
 651
 652         ocfs2_journal_dirty(handle, bh);
 653
 654         spin_lock(&OCFS2_I(inode)->ip_lock);
 655         clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
 656         spin_unlock(&OCFS2_I(inode)->ip_lock);
 657         /* Release unused quota reservation */
 658         dquot_free_space(inode,
 659                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 660         did_quota = 0;
 661
 662         if (why != RESTART_NONE && clusters_to_add) {
 663                 if (why == RESTART_META) {
 664                         mlog(0, "restarting function.\n");
 665                         restart_func = 1;
 666                         status = 0;
 667                 } else {
 668                         BUG_ON(why != RESTART_TRANS);
 669
 670                         mlog(0, "restarting transaction.\n");
 671                         /* TODO: This can be more intelligent. */
 672                         credits = ocfs2_calc_extend_credits(osb->sb,
 673                                                             &fe->id2.i_list,
 674                                                             clusters_to_add);
 675                         status = ocfs2_extend_trans(handle, credits);
 676                         if (status < 0) {
 677                                 /* handle still has to be committed at
 678                                  * this point. */
 679                                 status = -ENOMEM;
 680                                 mlog_errno(status);
 681                                 goto leave;
 682                         }
 683                         goto restarted_transaction;
 684                 }
 685         }
 686
 687         mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
 688              le32_to_cpu(fe->i_clusters),
 689              (unsigned long long)le64_to_cpu(fe->i_size));
 690         mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
 691              OCFS2_I(inode)->ip_clusters, (long long)i_size_read(inode));
 692
 693 leave:
 694         if (status < 0 && did_quota)
 695                 dquot_free_space(inode,
 696                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 697         if (handle) {
 698                 ocfs2_commit_trans(osb, handle);
 699                 handle = NULL;
 700         }
 701         if (data_ac) {
 702                 ocfs2_free_alloc_context(data_ac);
 703                 data_ac = NULL;
 704         }
 705         if (meta_ac) {
 706                 ocfs2_free_alloc_context(meta_ac);
 707                 meta_ac = NULL;
 708         }
 709         if ((!status) && restart_func) {
 710                 restart_func = 0;
 711                 goto restart_all;
 712         }
 713         brelse(bh);
 714         bh = NULL;
 715
 716         mlog_exit(status);
 717         return status;
 718 }
 719
 720 /*
 721  * While a write will already be ordering the data, a truncate will not.
 722  * Thus, we need to explicitly order the zeroed pages.
 723  */
 724 static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode)
 725 {
 726         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 727         handle_t *handle = NULL;
 728         int ret = 0;
 729
 730         if (!ocfs2_should_order_data(inode))
 731                 goto out;
 732
 733         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 734         if (IS_ERR(handle)) {
 735                 ret = -ENOMEM;
 736                 mlog_errno(ret);
 737                 goto out;
 738         }
 739
 740         ret = ocfs2_jbd2_file_inode(handle, inode);
 741         if (ret < 0)
 742                 mlog_errno(ret);
 743
 744 out:
 745         if (ret) {
 746                 if (!IS_ERR(handle))
 747                         ocfs2_commit_trans(osb, handle);
 748                 handle = ERR_PTR(ret);
 749         }
 750         return handle;
 751 }
 752
 753 /* Some parts of this taken from generic_cont_expand, which turned out
 754  * to be too fragile to do exactly what we need without us having to
 755  * worry about recursive locking in ->write_begin() and ->write_end(). */
 756 static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
 757                                  u64 abs_to)
 758 {
 759         struct address_space *mapping = inode->i_mapping;
 760         struct page *page;
 761         unsigned long index = abs_from >> PAGE_CACHE_SHIFT;
 762         handle_t *handle = NULL;
 763         int ret = 0;
 764         unsigned zero_from, zero_to, block_start, block_end;
 765
 766         BUG_ON(abs_from >= abs_to);
 767         BUG_ON(abs_to > (((u64)index + 1) << PAGE_CACHE_SHIFT));
 768         BUG_ON(abs_from & (inode->i_blkbits - 1));
 769
 770         page = find_or_create_page(mapping, index, GFP_NOFS);
 771         if (!page) {
 772                 ret = -ENOMEM;
 773                 mlog_errno(ret);
 774                 goto out;
 775         }
 776
 777         /* Get the offsets within the page that we want to zero */
 778         zero_from = abs_from & (PAGE_CACHE_SIZE - 1);
 779         zero_to = abs_to & (PAGE_CACHE_SIZE - 1);
 780         if (!zero_to)
 781                 zero_to = PAGE_CACHE_SIZE;
 782
 783         mlog(0,
 784              "abs_from = %llu, abs_to = %llu, index = %lu, zero_from = %u, zero_to = %u\n",
 785              (unsigned long long)abs_from, (unsigned long long)abs_to,
 786              index, zero_from, zero_to);
 787
 788         /* We know that zero_from is block aligned */
 789         for (block_start = zero_from; block_start < zero_to;
 790              block_start = block_end) {
 791                 block_end = block_start + (1 << inode->i_blkbits);
 792
 793                 /*
 794                  * block_start is block-aligned.  Bump it by one to force
 795                  * __block_write_begin and block_commit_write to zero the
 796                  * whole block.
 797                  */
 798                 ret = __block_write_begin(page, block_start + 1, 0,
 799                                           ocfs2_get_block);
 800                 if (ret < 0) {
 801                         mlog_errno(ret);
 802                         goto out_unlock;
 803                 }
 804
 805                 if (!handle) {
 806                         handle = ocfs2_zero_start_ordered_transaction(inode);
 807                         if (IS_ERR(handle)) {
 808                                 ret = PTR_ERR(handle);
 809                                 handle = NULL;
 810                                 break;
 811                         }
 812                 }
 813
 814                 /* must not update i_size! */
 815                 ret = block_commit_write(page, block_start + 1,
 816                                          block_start + 1);
 817                 if (ret < 0)
 818                         mlog_errno(ret);
 819                 else
 820                         ret = 0;
 821         }
 822
 823         if (handle)
 824                 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 825
 826 out_unlock:
 827         unlock_page(page);
 828         page_cache_release(page);
 829 out:
 830         return ret;
 831 }
 832
 833 /*
 834  * Find the next range to zero.  We do this in terms of bytes because
 835  * that's what ocfs2_zero_extend() wants, and it is dealing with the
 836  * pagecache.  We may return multiple extents.
 837  *
 838  * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
 839  * needs to be zeroed.  range_start and range_end return the next zeroing
 840  * range.  A subsequent call should pass the previous range_end as its
 841  * zero_start.  If range_end is 0, there's nothing to do.
 842  *
 843  * Unwritten extents are skipped over.  Refcounted extents are CoWd.
 844  */
 845 static int ocfs2_zero_extend_get_range(struct inode *inode,
 846                                        struct buffer_head *di_bh,
 847                                        u64 zero_start, u64 zero_end,
 848                                        u64 *range_start, u64 *range_end)
 849 {
 850         int rc = 0, needs_cow = 0;
 851         u32 p_cpos, zero_clusters = 0;
 852         u32 zero_cpos =
 853                 zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 854         u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
 855         unsigned int num_clusters = 0;
 856         unsigned int ext_flags = 0;
 857
 858         while (zero_cpos < last_cpos) {
 859                 rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
 860                                         &num_clusters, &ext_flags);
 861                 if (rc) {
 862                         mlog_errno(rc);
 863                         goto out;
 864                 }
 865
 866                 if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
 867                         zero_clusters = num_clusters;
 868                         if (ext_flags & OCFS2_EXT_REFCOUNTED)
 869                                 needs_cow = 1;
 870                         break;
 871                 }
 872
 873                 zero_cpos += num_clusters;
 874         }
 875         if (!zero_clusters) {
 876                 *range_end = 0;
 877                 goto out;
 878         }
 879
 880         while ((zero_cpos + zero_clusters) < last_cpos) {
 881                 rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
 882                                         &p_cpos, &num_clusters,
 883                                         &ext_flags);
 884                 if (rc) {
 885                         mlog_errno(rc);
 886                         goto out;
 887                 }
 888
 889                 if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
 890                         break;
 891                 if (ext_flags & OCFS2_EXT_REFCOUNTED)
 892                         needs_cow = 1;
 893                 zero_clusters += num_clusters;
 894         }
 895         if ((zero_cpos + zero_clusters) > last_cpos)
 896                 zero_clusters = last_cpos - zero_cpos;
 897
 898         if (needs_cow) {
 899                 rc = ocfs2_refcount_cow(inode, NULL, di_bh, zero_cpos,
 900                                         zero_clusters, UINT_MAX);
 901                 if (rc) {
 902                         mlog_errno(rc);
 903                         goto out;
 904                 }
 905         }
 906
 907         *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
 908         *range_end = ocfs2_clusters_to_bytes(inode->i_sb,
 909                                              zero_cpos + zero_clusters);
 910
 911 out:
 912         return rc;
 913 }
 914
 915 /*
 916  * Zero one range returned from ocfs2_zero_extend_get_range().  The caller
 917  * has made sure that the entire range needs zeroing.
 918  */
 919 static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
 920                                    u64 range_end)
 921 {
 922         int rc = 0;
 923         u64 next_pos;
 924         u64 zero_pos = range_start;
 925
 926         mlog(0, "range_start = %llu, range_end = %llu\n",
 927              (unsigned long long)range_start,
 928              (unsigned long long)range_end);
 929         BUG_ON(range_start >= range_end);
 930
 931         while (zero_pos < range_end) {
 932                 next_pos = (zero_pos & PAGE_CACHE_MASK) + PAGE_CACHE_SIZE;
 933                 if (next_pos > range_end)
 934                         next_pos = range_end;
 935                 rc = ocfs2_write_zero_page(inode, zero_pos, next_pos);
 936                 if (rc < 0) {
 937                         mlog_errno(rc);
 938                         break;
 939                 }
 940                 zero_pos = next_pos;
 941
 942                 /*
 943                  * Very large extends have the potential to lock up
 944                  * the cpu for extended periods of time.
 945                  */
 946                 cond_resched();
 947         }
 948
 949         return rc;
 950 }
 951
 952 int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
 953                       loff_t zero_to_size)
 954 {
 955         int ret = 0;
 956         u64 zero_start, range_start = 0, range_end = 0;
 957         struct super_block *sb = inode->i_sb;
 958
 959         zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
 960         mlog(0, "zero_start %llu for i_size %llu\n",
 961              (unsigned long long)zero_start,
 962              (unsigned long long)i_size_read(inode));
 963         while (zero_start < zero_to_size) {
 964                 ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
 965                                                   zero_to_size,
 966                                                   &range_start,
 967                                                   &range_end);
 968                 if (ret) {
 969                         mlog_errno(ret);
 970                         break;
 971                 }
 972                 if (!range_end)
 973                         break;
 974                 /* Trim the ends */
 975                 if (range_start < zero_start)
 976                         range_start = zero_start;
 977                 if (range_end > zero_to_size)
 978                         range_end = zero_to_size;
 979
 980                 ret = ocfs2_zero_extend_range(inode, range_start,
 981                                               range_end);
 982                 if (ret) {
 983                         mlog_errno(ret);
 984                         break;
 985                 }
 986                 zero_start = range_end;
 987         }
 988
 989         return ret;
 990 }
 991
 992 int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
 993                           u64 new_i_size, u64 zero_to)
 994 {
 995         int ret;
 996         u32 clusters_to_add;
 997         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 998
 999         /*
1000          * Only quota files call this without a bh, and they can't be
1001          * refcounted.
1002          */
1003         BUG_ON(!di_bh && (oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
1004         BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
1005
1006         clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
1007         if (clusters_to_add < oi->ip_clusters)
1008                 clusters_to_add = 0;
1009         else
1010                 clusters_to_add -= oi->ip_clusters;
1011
1012         if (clusters_to_add) {
1013                 ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
1014                                                 clusters_to_add, 0);
1015                 if (ret) {
1016                         mlog_errno(ret);
1017                         goto out;
1018                 }
1019         }
1020
1021         /*
1022          * Call this even if we don't add any clusters to the tree. We
1023          * still need to zero the area between the old i_size and the
1024          * new i_size.
1025          */
1026         ret = ocfs2_zero_extend(inode, di_bh, zero_to);
1027         if (ret < 0)
1028                 mlog_errno(ret);
1029
1030 out:
1031         return ret;
1032 }
1033
1034 static int ocfs2_extend_file(struct inode *inode,
1035                              struct buffer_head *di_bh,
1036                              u64 new_i_size)
1037 {
1038         int ret = 0;
1039         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1040
1041         BUG_ON(!di_bh);
1042
1043         /* setattr sometimes calls us like this. */
1044         if (new_i_size == 0)
1045                 goto out;
1046
1047         if (i_size_read(inode) == new_i_size)
1048                 goto out;
1049         BUG_ON(new_i_size < i_size_read(inode));
1050
1051         /*
1052          * The alloc sem blocks people in read/write from reading our
1053          * allocation until we're done changing it. We depend on
1054          * i_mutex to block other extend/truncate calls while we're
1055          * here.  We even have to hold it for sparse files because there
1056          * might be some tail zeroing.
1057          */
1058         down_write(&oi->ip_alloc_sem);
1059
1060         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1061                 /*
1062                  * We can optimize small extends by keeping the inodes
1063                  * inline data.
1064                  */
1065                 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1066                         up_write(&oi->ip_alloc_sem);
1067                         goto out_update_size;
1068                 }
1069
1070                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1071                 if (ret) {
1072                         up_write(&oi->ip_alloc_sem);
1073                         mlog_errno(ret);
1074                         goto out;
1075                 }
1076         }
1077
1078         if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1079                 ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1080         else
1081                 ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1082                                             new_i_size);
1083
1084         up_write(&oi->ip_alloc_sem);
1085
1086         if (ret < 0) {
1087                 mlog_errno(ret);
1088                 goto out;
1089         }
1090
1091 out_update_size:
1092         ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1093         if (ret < 0)
1094                 mlog_errno(ret);
1095
1096 out:
1097         return ret;
1098 }
1099
1100 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1101 {
1102         int status = 0, size_change;
1103         struct inode *inode = dentry->d_inode;
1104         struct super_block *sb = inode->i_sb;
1105         struct ocfs2_super *osb = OCFS2_SB(sb);
1106         struct buffer_head *bh = NULL;
1107         handle_t *handle = NULL;
1108         struct dquot *transfer_to[MAXQUOTAS] = { };
1109         int qtype;
1110
1111         mlog(0, "(0x%p, '%.*s')\n", dentry,
1112              dentry->d_name.len, dentry->d_name.name);
1113
1114         /* ensuring we don't even attempt to truncate a symlink */
1115         if (S_ISLNK(inode->i_mode))
1116                 attr->ia_valid &= ~ATTR_SIZE;
1117
1118         if (attr->ia_valid & ATTR_MODE)
1119                 mlog(0, "mode change: %d\n", attr->ia_mode);
1120         if (attr->ia_valid & ATTR_UID)
1121                 mlog(0, "uid change: %d\n", attr->ia_uid);
1122         if (attr->ia_valid & ATTR_GID)
1123                 mlog(0, "gid change: %d\n", attr->ia_gid);
1124         if (attr->ia_valid & ATTR_SIZE)
1125                 mlog(0, "size change...\n");
1126         if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
1127                 mlog(0, "time change...\n");
1128
1129 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1130                            | ATTR_GID | ATTR_UID | ATTR_MODE)
1131         if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
1132                 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
1133                 return 0;
1134         }
1135
1136         status = inode_change_ok(inode, attr);
1137         if (status)
1138                 return status;
1139
1140         if (is_quota_modification(inode, attr))
1141                 dquot_initialize(inode);
1142         size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1143         if (size_change) {
1144                 status = ocfs2_rw_lock(inode, 1);
1145                 if (status < 0) {
1146                         mlog_errno(status);
1147                         goto bail;
1148                 }
1149         }
1150
1151         status = ocfs2_inode_lock(inode, &bh, 1);
1152         if (status < 0) {
1153                 if (status != -ENOENT)
1154                         mlog_errno(status);
1155                 goto bail_unlock_rw;
1156         }
1157
1158         if (size_change && attr->ia_size != i_size_read(inode)) {
1159                 status = inode_newsize_ok(inode, attr->ia_size);
1160                 if (status)
1161                         goto bail_unlock;
1162
1163                 if (i_size_read(inode) > attr->ia_size) {
1164                         if (ocfs2_should_order_data(inode)) {
1165                                 status = ocfs2_begin_ordered_truncate(inode,
1166                                                                       attr->ia_size);
1167                                 if (status)
1168                                         goto bail_unlock;
1169                         }
1170                         status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1171                 } else
1172                         status = ocfs2_extend_file(inode, bh, attr->ia_size);
1173                 if (status < 0) {
1174                         if (status != -ENOSPC)
1175                                 mlog_errno(status);
1176                         status = -ENOSPC;
1177                         goto bail_unlock;
1178                 }
1179         }
1180
1181         if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
1182             (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
1183                 /*
1184                  * Gather pointers to quota structures so that allocation /
1185                  * freeing of quota structures happens here and not inside
1186                  * dquot_transfer() where we have problems with lock ordering
1187                  */
1188                 if (attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid
1189                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1190                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1191                         transfer_to[USRQUOTA] = dqget(sb, attr->ia_uid,
1192                                                       USRQUOTA);
1193                         if (!transfer_to[USRQUOTA]) {
1194                                 status = -ESRCH;
1195                                 goto bail_unlock;
1196                         }
1197                 }
1198                 if (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid
1199                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1200                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1201                         transfer_to[GRPQUOTA] = dqget(sb, attr->ia_gid,
1202                                                       GRPQUOTA);
1203                         if (!transfer_to[GRPQUOTA]) {
1204                                 status = -ESRCH;
1205                                 goto bail_unlock;
1206                         }
1207                 }
1208                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1209                                            2 * ocfs2_quota_trans_credits(sb));
1210                 if (IS_ERR(handle)) {
1211                         status = PTR_ERR(handle);
1212                         mlog_errno(status);
1213                         goto bail_unlock;
1214                 }
1215                 status = __dquot_transfer(inode, transfer_to);
1216                 if (status < 0)
1217                         goto bail_commit;
1218         } else {
1219                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1220                 if (IS_ERR(handle)) {
1221                         status = PTR_ERR(handle);
1222                         mlog_errno(status);
1223                         goto bail_unlock;
1224                 }
1225         }
1226
1227         /*
1228          * This will intentionally not wind up calling truncate_setsize(),
1229          * since all the work for a size change has been done above.
1230          * Otherwise, we could get into problems with truncate as
1231          * ip_alloc_sem is used there to protect against i_size
1232          * changes.
1233          *
1234          * XXX: this means the conditional below can probably be removed.
1235          */
1236         if ((attr->ia_valid & ATTR_SIZE) &&
1237             attr->ia_size != i_size_read(inode)) {
1238                 status = vmtruncate(inode, attr->ia_size);
1239                 if (status) {
1240                         mlog_errno(status);
1241                         goto bail_commit;
1242                 }
1243         }
1244
1245         setattr_copy(inode, attr);
1246         mark_inode_dirty(inode);
1247
1248         status = ocfs2_mark_inode_dirty(handle, inode, bh);
1249         if (status < 0)
1250                 mlog_errno(status);
1251
1252 bail_commit:
1253         ocfs2_commit_trans(osb, handle);
1254 bail_unlock:
1255         ocfs2_inode_unlock(inode, 1);
1256 bail_unlock_rw:
1257         if (size_change)
1258                 ocfs2_rw_unlock(inode, 1);
1259 bail:
1260         brelse(bh);
1261
1262         /* Release quota pointers in case we acquired them */
1263         for (qtype = 0; qtype < MAXQUOTAS; qtype++)
1264                 dqput(transfer_to[qtype]);
1265
1266         if (!status && attr->ia_valid & ATTR_MODE) {
1267                 status = ocfs2_acl_chmod(inode);
1268                 if (status < 0)
1269                         mlog_errno(status);
1270         }
1271
1272         mlog_exit(status);
1273         return status;
1274 }
1275
1276 int ocfs2_getattr(struct vfsmount *mnt,
1277                   struct dentry *dentry,
1278                   struct kstat *stat)
1279 {
1280         struct inode *inode = dentry->d_inode;
1281         struct super_block *sb = dentry->d_inode->i_sb;
1282         struct ocfs2_super *osb = sb->s_fs_info;
1283         int err;
1284
1285         err = ocfs2_inode_revalidate(dentry);
1286         if (err) {
1287                 if (err != -ENOENT)
1288                         mlog_errno(err);
1289                 goto bail;
1290         }
1291
1292         generic_fillattr(inode, stat);
1293
1294         /* We set the blksize from the cluster size for performance */
1295         stat->blksize = osb->s_clustersize;
1296
1297 bail:
1298         mlog_exit(err);
1299
1300         return err;
1301 }
1302
1303 int ocfs2_permission(struct inode *inode, int mask, unsigned int flags)
1304 {
1305         int ret;
1306
1307         if (flags & IPERM_FLAG_RCU)
1308                 return -ECHILD;
1309
1310         ret = ocfs2_inode_lock(inode, NULL, 0);
1311         if (ret) {
1312                 if (ret != -ENOENT)
1313                         mlog_errno(ret);
1314                 goto out;
1315         }
1316
1317         ret = generic_permission(inode, mask, flags, ocfs2_check_acl);
1318
1319         ocfs2_inode_unlock(inode, 0);
1320 out:
1321         mlog_exit(ret);
1322         return ret;
1323 }
1324
1325 static int __ocfs2_write_remove_suid(struct inode *inode,
1326                                      struct buffer_head *bh)
1327 {
1328         int ret;
1329         handle_t *handle;
1330         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1331         struct ocfs2_dinode *di;
1332
1333         mlog(0, "(Inode %llu, mode 0%o)\n",
1334              (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
1335
1336         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1337         if (IS_ERR(handle)) {
1338                 ret = PTR_ERR(handle);
1339                 mlog_errno(ret);
1340                 goto out;
1341         }
1342
1343         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1344                                       OCFS2_JOURNAL_ACCESS_WRITE);
1345         if (ret < 0) {
1346                 mlog_errno(ret);
1347                 goto out_trans;
1348         }
1349
1350         inode->i_mode &= ~S_ISUID;
1351         if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1352                 inode->i_mode &= ~S_ISGID;
1353
1354         di = (struct ocfs2_dinode *) bh->b_data;
1355         di->i_mode = cpu_to_le16(inode->i_mode);
1356
1357         ocfs2_journal_dirty(handle, bh);
1358
1359 out_trans:
1360         ocfs2_commit_trans(osb, handle);
1361 out:
1362         mlog_exit(ret);
1363         return ret;
1364 }
1365
1366 /*
1367  * Will look for holes and unwritten extents in the range starting at
1368  * pos for count bytes (inclusive).
1369  */
1370 static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1371                                        size_t count)
1372 {
1373         int ret = 0;
1374         unsigned int extent_flags;
1375         u32 cpos, clusters, extent_len, phys_cpos;
1376         struct super_block *sb = inode->i_sb;
1377
1378         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1379         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1380
1381         while (clusters) {
1382                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1383                                          &extent_flags);
1384                 if (ret < 0) {
1385                         mlog_errno(ret);
1386                         goto out;
1387                 }
1388
1389                 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1390                         ret = 1;
1391                         break;
1392                 }
1393
1394                 if (extent_len > clusters)
1395                         extent_len = clusters;
1396
1397                 clusters -= extent_len;
1398                 cpos += extent_len;
1399         }
1400 out:
1401         return ret;
1402 }
1403
1404 static int ocfs2_write_remove_suid(struct inode *inode)
1405 {
1406         int ret;
1407         struct buffer_head *bh = NULL;
1408
1409         ret = ocfs2_read_inode_block(inode, &bh);
1410         if (ret < 0) {
1411                 mlog_errno(ret);
1412                 goto out;
1413         }
1414
1415         ret =  __ocfs2_write_remove_suid(inode, bh);
1416 out:
1417         brelse(bh);
1418         return ret;
1419 }
1420
1421 /*
1422  * Allocate enough extents to cover the region starting at byte offset
1423  * start for len bytes. Existing extents are skipped, any extents
1424  * added are marked as "unwritten".
1425  */
1426 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1427                                             u64 start, u64 len)
1428 {
1429         int ret;
1430         u32 cpos, phys_cpos, clusters, alloc_size;
1431         u64 end = start + len;
1432         struct buffer_head *di_bh = NULL;
1433
1434         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1435                 ret = ocfs2_read_inode_block(inode, &di_bh);
1436                 if (ret) {
1437                         mlog_errno(ret);
1438                         goto out;
1439                 }
1440
1441                 /*
1442                  * Nothing to do if the requested reservation range
1443                  * fits within the inode.
1444                  */
1445                 if (ocfs2_size_fits_inline_data(di_bh, end))
1446                         goto out;
1447
1448                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1449                 if (ret) {
1450                         mlog_errno(ret);
1451                         goto out;
1452                 }
1453         }
1454
1455         /*
1456          * We consider both start and len to be inclusive.
1457          */
1458         cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1459         clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1460         clusters -= cpos;
1461
1462         while (clusters) {
1463                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1464                                          &alloc_size, NULL);
1465                 if (ret) {
1466                         mlog_errno(ret);
1467                         goto out;
1468                 }
1469
1470                 /*
1471                  * Hole or existing extent len can be arbitrary, so
1472                  * cap it to our own allocation request.
1473                  */
1474                 if (alloc_size > clusters)
1475                         alloc_size = clusters;
1476
1477                 if (phys_cpos) {
1478                         /*
1479                          * We already have an allocation at this
1480                          * region so we can safely skip it.
1481                          */
1482                         goto next;
1483                 }
1484
1485                 ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1486                 if (ret) {
1487                         if (ret != -ENOSPC)
1488                                 mlog_errno(ret);
1489                         goto out;
1490                 }
1491
1492 next:
1493                 cpos += alloc_size;
1494                 clusters -= alloc_size;
1495         }
1496
1497         ret = 0;
1498 out:
1499
1500         brelse(di_bh);
1501         return ret;
1502 }
1503
1504 /*
1505  * Truncate a byte range, avoiding pages within partial clusters. This
1506  * preserves those pages for the zeroing code to write to.
1507  */
1508 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1509                                          u64 byte_len)
1510 {
1511         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1512         loff_t start, end;
1513         struct address_space *mapping = inode->i_mapping;
1514
1515         start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1516         end = byte_start + byte_len;
1517         end = end & ~(osb->s_clustersize - 1);
1518
1519         if (start < end) {
1520                 unmap_mapping_range(mapping, start, end - start, 0);
1521                 truncate_inode_pages_range(mapping, start, end - 1);
1522         }
1523 }
1524
1525 static int ocfs2_zero_partial_clusters(struct inode *inode,
1526                                        u64 start, u64 len)
1527 {
1528         int ret = 0;
1529         u64 tmpend, end = start + len;
1530         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1531         unsigned int csize = osb->s_clustersize;
1532         handle_t *handle;
1533
1534         /*
1535          * The "start" and "end" values are NOT necessarily part of
1536          * the range whose allocation is being deleted. Rather, this
1537          * is what the user passed in with the request. We must zero
1538          * partial clusters here. There's no need to worry about
1539          * physical allocation - the zeroing code knows to skip holes.
1540          */
1541         mlog(0, "byte start: %llu, end: %llu\n",
1542              (unsigned long long)start, (unsigned long long)end);
1543
1544         /*
1545          * If both edges are on a cluster boundary then there's no
1546          * zeroing required as the region is part of the allocation to
1547          * be truncated.
1548          */
1549         if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1550                 goto out;
1551
1552         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1553         if (IS_ERR(handle)) {
1554                 ret = PTR_ERR(handle);
1555                 mlog_errno(ret);
1556                 goto out;
1557         }
1558
1559         /*
1560          * We want to get the byte offset of the end of the 1st cluster.
1561          */
1562         tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1563         if (tmpend > end)
1564                 tmpend = end;
1565
1566         mlog(0, "1st range: start: %llu, tmpend: %llu\n",
1567              (unsigned long long)start, (unsigned long long)tmpend);
1568
1569         ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1570         if (ret)
1571                 mlog_errno(ret);
1572
1573         if (tmpend < end) {
1574                 /*
1575                  * This may make start and end equal, but the zeroing
1576                  * code will skip any work in that case so there's no
1577                  * need to catch it up here.
1578                  */
1579                 start = end & ~(osb->s_clustersize - 1);
1580
1581                 mlog(0, "2nd range: start: %llu, end: %llu\n",
1582                      (unsigned long long)start, (unsigned long long)end);
1583
1584                 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1585                 if (ret)
1586                         mlog_errno(ret);
1587         }
1588
1589         ocfs2_commit_trans(osb, handle);
1590 out:
1591         return ret;
1592 }
1593
1594 static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1595 {
1596         int i;
1597         struct ocfs2_extent_rec *rec = NULL;
1598
1599         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1600
1601                 rec = &el->l_recs[i];
1602
1603                 if (le32_to_cpu(rec->e_cpos) < pos)
1604                         break;
1605         }
1606
1607         return i;
1608 }
1609
1610 /*
1611  * Helper to calculate the punching pos and length in one run, we handle the
1612  * following three cases in order:
1613  *
1614  * - remove the entire record
1615  * - remove a partial record
1616  * - no record needs to be removed (hole-punching completed)
1617 */
1618 static void ocfs2_calc_trunc_pos(struct inode *inode,
1619                                  struct ocfs2_extent_list *el,
1620                                  struct ocfs2_extent_rec *rec,
1621                                  u32 trunc_start, u32 *trunc_cpos,
1622                                  u32 *trunc_len, u32 *trunc_end,
1623                                  u64 *blkno, int *done)
1624 {
1625         int ret = 0;
1626         u32 coff, range;
1627
1628         range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1629
1630         if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1631                 *trunc_cpos = le32_to_cpu(rec->e_cpos);
1632                 /*
1633                  * Skip holes if any.
1634                  */
1635                 if (range < *trunc_end)
1636                         *trunc_end = range;
1637                 *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1638                 *blkno = le64_to_cpu(rec->e_blkno);
1639                 *trunc_end = le32_to_cpu(rec->e_cpos);
1640         } else if (range > trunc_start) {
1641                 *trunc_cpos = trunc_start;
1642                 *trunc_len = *trunc_end - trunc_start;
1643                 coff = trunc_start - le32_to_cpu(rec->e_cpos);
1644                 *blkno = le64_to_cpu(rec->e_blkno) +
1645                                 ocfs2_clusters_to_blocks(inode->i_sb, coff);
1646                 *trunc_end = trunc_start;
1647         } else {
1648                 /*
1649                  * It may have two following possibilities:
1650                  *
1651                  * - last record has been removed
1652                  * - trunc_start was within a hole
1653                  *
1654                  * both two cases mean the completion of hole punching.
1655                  */
1656                 ret = 1;
1657         }
1658
1659         *done = ret;
1660 }
1661
1662 static int ocfs2_remove_inode_range(struct inode *inode,
1663                                     struct buffer_head *di_bh, u64 byte_start,
1664                                     u64 byte_len)
1665 {
1666         int ret = 0, flags = 0, done = 0, i;
1667         u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1668         u32 cluster_in_el;
1669         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1670         struct ocfs2_cached_dealloc_ctxt dealloc;
1671         struct address_space *mapping = inode->i_mapping;
1672         struct ocfs2_extent_tree et;
1673         struct ocfs2_path *path = NULL;
1674         struct ocfs2_extent_list *el = NULL;
1675         struct ocfs2_extent_rec *rec = NULL;
1676         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1677         u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1678
1679         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1680         ocfs2_init_dealloc_ctxt(&dealloc);
1681
1682         if (byte_len == 0)
1683                 return 0;
1684
1685         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1686                 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1687                                             byte_start + byte_len, 0);
1688                 if (ret) {
1689                         mlog_errno(ret);
1690                         goto out;
1691                 }
1692                 /*
1693                  * There's no need to get fancy with the page cache
1694                  * truncate of an inline-data inode. We're talking
1695                  * about less than a page here, which will be cached
1696                  * in the dinode buffer anyway.
1697                  */
1698                 unmap_mapping_range(mapping, 0, 0, 0);
1699                 truncate_inode_pages(mapping, 0);
1700                 goto out;
1701         }
1702
1703         /*
1704          * For reflinks, we may need to CoW 2 clusters which might be
1705          * partially zero'd later, if hole's start and end offset were
1706          * within one cluster(means is not exactly aligned to clustersize).
1707          */
1708
1709         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
1710
1711                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1712                 if (ret) {
1713                         mlog_errno(ret);
1714                         goto out;
1715                 }
1716
1717                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1718                 if (ret) {
1719                         mlog_errno(ret);
1720                         goto out;
1721                 }
1722         }
1723
1724         trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1725         trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1726         cluster_in_el = trunc_end;
1727
1728         mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, cend: %u\n",
1729              (unsigned long long)OCFS2_I(inode)->ip_blkno,
1730              (unsigned long long)byte_start,
1731              (unsigned long long)byte_len, trunc_start, trunc_end);
1732
1733         ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1734         if (ret) {
1735                 mlog_errno(ret);
1736                 goto out;
1737         }
1738
1739         path = ocfs2_new_path_from_et(&et);
1740         if (!path) {
1741                 ret = -ENOMEM;
1742                 mlog_errno(ret);
1743                 goto out;
1744         }
1745
1746         while (trunc_end > trunc_start) {
1747
1748                 ret = ocfs2_find_path(INODE_CACHE(inode), path,
1749                                       cluster_in_el);
1750                 if (ret) {
1751                         mlog_errno(ret);
1752                         goto out;
1753                 }
1754
1755                 el = path_leaf_el(path);
1756
1757                 i = ocfs2_find_rec(el, trunc_end);
1758                 /*
1759                  * Need to go to previous extent block.
1760                  */
1761                 if (i < 0) {
1762                         if (path->p_tree_depth == 0)
1763                                 break;
1764
1765                         ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1766                                                             path,
1767                                                             &cluster_in_el);
1768                         if (ret) {
1769                                 mlog_errno(ret);
1770                                 goto out;
1771                         }
1772
1773                         /*
1774                          * We've reached the leftmost extent block,
1775                          * it's safe to leave.
1776                          */
1777                         if (cluster_in_el == 0)
1778                                 break;
1779
1780                         /*
1781                          * The 'pos' searched for previous extent block is
1782                          * always one cluster less than actual trunc_end.
1783                          */
1784                         trunc_end = cluster_in_el + 1;
1785
1786                         ocfs2_reinit_path(path, 1);
1787
1788                         continue;
1789
1790                 } else
1791                         rec = &el->l_recs[i];
1792
1793                 ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1794                                      &trunc_len, &trunc_end, &blkno, &done);
1795                 if (done)
1796                         break;
1797
1798                 flags = rec->e_flags;
1799                 phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1800
1801                 ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1802                                                phys_cpos, trunc_len, flags,
1803                                                &dealloc, refcount_loc);
1804                 if (ret < 0) {
1805                         mlog_errno(ret);
1806                         goto out;
1807                 }
1808
1809                 cluster_in_el = trunc_end;
1810
1811                 ocfs2_reinit_path(path, 1);
1812         }
1813
1814         ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1815
1816 out:
1817         ocfs2_schedule_truncate_log_flush(osb, 1);
1818         ocfs2_run_deallocs(osb, &dealloc);
1819
1820         return ret;
1821 }
1822
1823 /*
1824  * Parts of this function taken from xfs_change_file_space()
1825  */
1826 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1827                                      loff_t f_pos, unsigned int cmd,
1828                                      struct ocfs2_space_resv *sr,
1829                                      int change_size)
1830 {
1831         int ret;
1832         s64 llen;
1833         loff_t size;
1834         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1835         struct buffer_head *di_bh = NULL;
1836         handle_t *handle;
1837         unsigned long long max_off = inode->i_sb->s_maxbytes;
1838
1839         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1840                 return -EROFS;
1841
1842         mutex_lock(&inode->i_mutex);
1843
1844         /*
1845          * This prevents concurrent writes on other nodes
1846          */
1847         ret = ocfs2_rw_lock(inode, 1);
1848         if (ret) {
1849                 mlog_errno(ret);
1850                 goto out;
1851         }
1852
1853         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1854         if (ret) {
1855                 mlog_errno(ret);
1856                 goto out_rw_unlock;
1857         }
1858
1859         if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1860                 ret = -EPERM;
1861                 goto out_inode_unlock;
1862         }
1863
1864         switch (sr->l_whence) {
1865         case 0: /*SEEK_SET*/
1866                 break;
1867         case 1: /*SEEK_CUR*/
1868                 sr->l_start += f_pos;
1869                 break;
1870         case 2: /*SEEK_END*/
1871                 sr->l_start += i_size_read(inode);
1872                 break;
1873         default:
1874                 ret = -EINVAL;
1875                 goto out_inode_unlock;
1876         }
1877         sr->l_whence = 0;
1878
1879         llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1880
1881         if (sr->l_start < 0
1882             || sr->l_start > max_off
1883             || (sr->l_start + llen) < 0
1884             || (sr->l_start + llen) > max_off) {
1885                 ret = -EINVAL;
1886                 goto out_inode_unlock;
1887         }
1888         size = sr->l_start + sr->l_len;
1889
1890         if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
1891                 if (sr->l_len <= 0) {
1892                         ret = -EINVAL;
1893                         goto out_inode_unlock;
1894                 }
1895         }
1896
1897         if (file && should_remove_suid(file->f_path.dentry)) {
1898                 ret = __ocfs2_write_remove_suid(inode, di_bh);
1899                 if (ret) {
1900                         mlog_errno(ret);
1901                         goto out_inode_unlock;
1902                 }
1903         }
1904
1905         down_write(&OCFS2_I(inode)->ip_alloc_sem);
1906         switch (cmd) {
1907         case OCFS2_IOC_RESVSP:
1908         case OCFS2_IOC_RESVSP64:
1909                 /*
1910                  * This takes unsigned offsets, but the signed ones we
1911                  * pass have been checked against overflow above.
1912                  */
1913                 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1914                                                        sr->l_len);
1915                 break;
1916         case OCFS2_IOC_UNRESVSP:
1917         case OCFS2_IOC_UNRESVSP64:
1918                 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1919                                                sr->l_len);
1920                 break;
1921         default:
1922                 ret = -EINVAL;
1923         }
1924         up_write(&OCFS2_I(inode)->ip_alloc_sem);
1925         if (ret) {
1926                 mlog_errno(ret);
1927                 goto out_inode_unlock;
1928         }
1929
1930         /*
1931          * We update c/mtime for these changes
1932          */
1933         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1934         if (IS_ERR(handle)) {
1935                 ret = PTR_ERR(handle);
1936                 mlog_errno(ret);
1937                 goto out_inode_unlock;
1938         }
1939
1940         if (change_size && i_size_read(inode) < size)
1941                 i_size_write(inode, size);
1942
1943         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1944         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1945         if (ret < 0)
1946                 mlog_errno(ret);
1947
1948         ocfs2_commit_trans(osb, handle);
1949
1950 out_inode_unlock:
1951         brelse(di_bh);
1952         ocfs2_inode_unlock(inode, 1);
1953 out_rw_unlock:
1954         ocfs2_rw_unlock(inode, 1);
1955
1956 out:
1957         mutex_unlock(&inode->i_mutex);
1958         return ret;
1959 }
1960
1961 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1962                             struct ocfs2_space_resv *sr)
1963 {
1964         struct inode *inode = file->f_path.dentry->d_inode;
1965         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1966
1967         if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1968             !ocfs2_writes_unwritten_extents(osb))
1969                 return -ENOTTY;
1970         else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1971                  !ocfs2_sparse_alloc(osb))
1972                 return -ENOTTY;
1973
1974         if (!S_ISREG(inode->i_mode))
1975                 return -EINVAL;
1976
1977         if (!(file->f_mode & FMODE_WRITE))
1978                 return -EBADF;
1979
1980         return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1981 }
1982
1983 static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
1984                             loff_t len)
1985 {
1986         struct inode *inode = file->f_path.dentry->d_inode;
1987         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1988         struct ocfs2_space_resv sr;
1989         int change_size = 1;
1990         int cmd = OCFS2_IOC_RESVSP64;
1991
1992         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1993                 return -EOPNOTSUPP;
1994         if (!ocfs2_writes_unwritten_extents(osb))
1995                 return -EOPNOTSUPP;
1996
1997         if (mode & FALLOC_FL_KEEP_SIZE)
1998                 change_size = 0;
1999
2000         if (mode & FALLOC_FL_PUNCH_HOLE)
2001                 cmd = OCFS2_IOC_UNRESVSP64;
2002
2003         sr.l_whence = 0;
2004         sr.l_start = (s64)offset;
2005         sr.l_len = (s64)len;
2006
2007         return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
2008                                          change_size);
2009 }
2010
2011 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2012                                    size_t count)
2013 {
2014         int ret = 0;
2015         unsigned int extent_flags;
2016         u32 cpos, clusters, extent_len, phys_cpos;
2017         struct super_block *sb = inode->i_sb;
2018
2019         if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2020             !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
2021             OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2022                 return 0;
2023
2024         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2025         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2026
2027         while (clusters) {
2028                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2029                                          &extent_flags);
2030                 if (ret < 0) {
2031                         mlog_errno(ret);
2032                         goto out;
2033                 }
2034
2035                 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2036                         ret = 1;
2037                         break;
2038                 }
2039
2040                 if (extent_len > clusters)
2041                         extent_len = clusters;
2042
2043                 clusters -= extent_len;
2044                 cpos += extent_len;
2045         }
2046 out:
2047         return ret;
2048 }
2049
2050 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
2051                                             struct file *file,
2052                                             loff_t pos, size_t count,
2053                                             int *meta_level)
2054 {
2055         int ret;
2056         struct buffer_head *di_bh = NULL;
2057         u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2058         u32 clusters =
2059                 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2060
2061         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2062         if (ret) {
2063                 mlog_errno(ret);
2064                 goto out;
2065         }
2066
2067         *meta_level = 1;
2068
2069         ret = ocfs2_refcount_cow(inode, file, di_bh, cpos, clusters, UINT_MAX);
2070         if (ret)
2071                 mlog_errno(ret);
2072 out:
2073         brelse(di_bh);
2074         return ret;
2075 }
2076
2077 static int ocfs2_prepare_inode_for_write(struct file *file,
2078                                          loff_t *ppos,
2079                                          size_t count,
2080                                          int appending,
2081                                          int *direct_io,
2082                                          int *has_refcount)
2083 {
2084         int ret = 0, meta_level = 0;
2085         struct dentry *dentry = file->f_path.dentry;
2086         struct inode *inode = dentry->d_inode;
2087         loff_t saved_pos, end;
2088
2089         /*
2090          * We start with a read level meta lock and only jump to an ex
2091          * if we need to make modifications here.
2092          */
2093         for(;;) {
2094                 ret = ocfs2_inode_lock(inode, NULL, meta_level);
2095                 if (ret < 0) {
2096                         meta_level = -1;
2097                         mlog_errno(ret);
2098                         goto out;
2099                 }
2100
2101                 /* Clear suid / sgid if necessary. We do this here
2102                  * instead of later in the write path because
2103                  * remove_suid() calls ->setattr without any hint that
2104                  * we may have already done our cluster locking. Since
2105                  * ocfs2_setattr() *must* take cluster locks to
2106                  * proceeed, this will lead us to recursively lock the
2107                  * inode. There's also the dinode i_size state which
2108                  * can be lost via setattr during extending writes (we
2109                  * set inode->i_size at the end of a write. */
2110                 if (should_remove_suid(dentry)) {
2111                         if (meta_level == 0) {
2112                                 ocfs2_inode_unlock(inode, meta_level);
2113                                 meta_level = 1;
2114                                 continue;
2115                         }
2116
2117                         ret = ocfs2_write_remove_suid(inode);
2118                         if (ret < 0) {
2119                                 mlog_errno(ret);
2120                                 goto out_unlock;
2121                         }
2122                 }
2123
2124                 /* work on a copy of ppos until we're sure that we won't have
2125                  * to recalculate it due to relocking. */
2126                 if (appending) {
2127                         saved_pos = i_size_read(inode);
2128                         mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
2129                 } else {
2130                         saved_pos = *ppos;
2131                 }
2132
2133                 end = saved_pos + count;
2134
2135                 ret = ocfs2_check_range_for_refcount(inode, saved_pos, count);
2136                 if (ret == 1) {
2137                         ocfs2_inode_unlock(inode, meta_level);
2138                         meta_level = -1;
2139
2140                         ret = ocfs2_prepare_inode_for_refcount(inode,
2141                                                                file,
2142                                                                saved_pos,
2143                                                                count,
2144                                                                &meta_level);
2145                         if (has_refcount)
2146                                 *has_refcount = 1;
2147                         if (direct_io)
2148                                 *direct_io = 0;
2149                 }
2150
2151                 if (ret < 0) {
2152                         mlog_errno(ret);
2153                         goto out_unlock;
2154                 }
2155
2156                 /*
2157                  * Skip the O_DIRECT checks if we don't need
2158                  * them.
2159                  */
2160                 if (!direct_io || !(*direct_io))
2161                         break;
2162
2163                 /*
2164                  * There's no sane way to do direct writes to an inode
2165                  * with inline data.
2166                  */
2167                 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2168                         *direct_io = 0;
2169                         break;
2170                 }
2171
2172                 /*
2173                  * Allowing concurrent direct writes means
2174                  * i_size changes wouldn't be synchronized, so
2175                  * one node could wind up truncating another
2176                  * nodes writes.
2177                  */
2178                 if (end > i_size_read(inode)) {
2179                         *direct_io = 0;
2180                         break;
2181                 }
2182
2183                 /*
2184                  * We don't fill holes during direct io, so
2185                  * check for them here. If any are found, the
2186                  * caller will have to retake some cluster
2187                  * locks and initiate the io as buffered.
2188                  */
2189                 ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
2190                 if (ret == 1) {
2191                         *direct_io = 0;
2192                         ret = 0;
2193                 } else if (ret < 0)
2194                         mlog_errno(ret);
2195                 break;
2196         }
2197
2198         if (appending)
2199                 *ppos = saved_pos;
2200
2201 out_unlock:
2202         if (meta_level >= 0)
2203                 ocfs2_inode_unlock(inode, meta_level);
2204
2205 out:
2206         return ret;
2207 }
2208
2209 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
2210                                     const struct iovec *iov,
2211                                     unsigned long nr_segs,
2212                                     loff_t pos)
2213 {
2214         int ret, direct_io, appending, rw_level, have_alloc_sem  = 0;
2215         int can_do_direct, has_refcount = 0;
2216         ssize_t written = 0;
2217         size_t ocount;          /* original count */
2218         size_t count;           /* after file limit checks */
2219         loff_t old_size, *ppos = &iocb->ki_pos;
2220         u32 old_clusters;
2221         struct file *file = iocb->ki_filp;
2222         struct inode *inode = file->f_path.dentry->d_inode;
2223         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2224         int full_coherency = !(osb->s_mount_opt &
2225                                OCFS2_MOUNT_COHERENCY_BUFFERED);
2226
2227         mlog(0, "(0x%p, %u, '%.*s')\n", file,
2228              (unsigned int)nr_segs,
2229              file->f_path.dentry->d_name.len,
2230              file->f_path.dentry->d_name.name);
2231
2232         if (iocb->ki_left == 0)
2233                 return 0;
2234
2235         vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
2236
2237         appending = file->f_flags & O_APPEND ? 1 : 0;
2238         direct_io = file->f_flags & O_DIRECT ? 1 : 0;
2239
2240         mutex_lock(&inode->i_mutex);
2241
2242         ocfs2_iocb_clear_sem_locked(iocb);
2243
2244 relock:
2245         /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
2246         if (direct_io) {
2247                 down_read(&inode->i_alloc_sem);
2248                 have_alloc_sem = 1;
2249                 /* communicate with ocfs2_dio_end_io */
2250                 ocfs2_iocb_set_sem_locked(iocb);
2251         }
2252
2253         /*
2254          * Concurrent O_DIRECT writes are allowed with
2255          * mount_option "coherency=buffered".
2256          */
2257         rw_level = (!direct_io || full_coherency);
2258
2259         ret = ocfs2_rw_lock(inode, rw_level);
2260         if (ret < 0) {
2261                 mlog_errno(ret);
2262                 goto out_sems;
2263         }
2264
2265         /*
2266          * O_DIRECT writes with "coherency=full" need to take EX cluster
2267          * inode_lock to guarantee coherency.
2268          */
2269         if (direct_io && full_coherency) {
2270                 /*
2271                  * We need to take and drop the inode lock to force
2272                  * other nodes to drop their caches.  Buffered I/O
2273                  * already does this in write_begin().
2274                  */
2275                 ret = ocfs2_inode_lock(inode, NULL, 1);
2276                 if (ret < 0) {
2277                         mlog_errno(ret);
2278                         goto out_sems;
2279                 }
2280
2281                 ocfs2_inode_unlock(inode, 1);
2282         }
2283
2284         can_do_direct = direct_io;
2285         ret = ocfs2_prepare_inode_for_write(file, ppos,
2286                                             iocb->ki_left, appending,
2287                                             &can_do_direct, &has_refcount);
2288         if (ret < 0) {
2289                 mlog_errno(ret);
2290                 goto out;
2291         }
2292
2293         /*
2294          * We can't complete the direct I/O as requested, fall back to
2295          * buffered I/O.
2296          */
2297         if (direct_io && !can_do_direct) {
2298                 ocfs2_rw_unlock(inode, rw_level);
2299                 up_read(&inode->i_alloc_sem);
2300
2301                 have_alloc_sem = 0;
2302                 rw_level = -1;
2303
2304                 direct_io = 0;
2305                 goto relock;
2306         }
2307
2308         /*
2309          * To later detect whether a journal commit for sync writes is
2310          * necessary, we sample i_size, and cluster count here.
2311          */
2312         old_size = i_size_read(inode);
2313         old_clusters = OCFS2_I(inode)->ip_clusters;
2314
2315         /* communicate with ocfs2_dio_end_io */
2316         ocfs2_iocb_set_rw_locked(iocb, rw_level);
2317
2318         ret = generic_segment_checks(iov, &nr_segs, &ocount,
2319                                      VERIFY_READ);
2320         if (ret)
2321                 goto out_dio;
2322
2323         count = ocount;
2324         ret = generic_write_checks(file, ppos, &count,
2325                                    S_ISBLK(inode->i_mode));
2326         if (ret)
2327                 goto out_dio;
2328
2329         if (direct_io) {
2330                 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
2331                                                     ppos, count, ocount);
2332                 if (written < 0) {
2333                         ret = written;
2334                         goto out_dio;
2335                 }
2336         } else {
2337                 current->backing_dev_info = file->f_mapping->backing_dev_info;
2338                 written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos,
2339                                                       ppos, count, 0);
2340                 current->backing_dev_info = NULL;
2341         }
2342
2343 out_dio:
2344         /* buffered aio wouldn't have proper lock coverage today */
2345         BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2346
2347         if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
2348             ((file->f_flags & O_DIRECT) && !direct_io)) {
2349                 ret = filemap_fdatawrite_range(file->f_mapping, pos,
2350                                                pos + count - 1);
2351                 if (ret < 0)
2352                         written = ret;
2353
2354                 if (!ret && ((old_size != i_size_read(inode)) ||
2355                              (old_clusters != OCFS2_I(inode)->ip_clusters) ||
2356                              has_refcount)) {
2357                         ret = jbd2_journal_force_commit(osb->journal->j_journal);
2358                         if (ret < 0)
2359                                 written = ret;
2360                 }
2361
2362                 if (!ret)
2363                         ret = filemap_fdatawait_range(file->f_mapping, pos,
2364                                                       pos + count - 1);
2365         }
2366
2367         /*
2368          * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2369          * function pointer which is called when o_direct io completes so that
2370          * it can unlock our rw lock.  (it's the clustered equivalent of
2371          * i_alloc_sem; protects truncate from racing with pending ios).
2372          * Unfortunately there are error cases which call end_io and others
2373          * that don't.  so we don't have to unlock the rw_lock if either an
2374          * async dio is going to do it in the future or an end_io after an
2375          * error has already done it.
2376          */
2377         if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2378                 rw_level = -1;
2379                 have_alloc_sem = 0;
2380         }
2381
2382 out:
2383         if (rw_level != -1)
2384                 ocfs2_rw_unlock(inode, rw_level);
2385
2386 out_sems:
2387         if (have_alloc_sem) {
2388                 up_read(&inode->i_alloc_sem);
2389                 ocfs2_iocb_clear_sem_locked(iocb);
2390         }
2391
2392         mutex_unlock(&inode->i_mutex);
2393
2394         if (written)
2395                 ret = written;
2396         mlog_exit(ret);
2397         return ret;
2398 }
2399
2400 static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
2401                                 struct file *out,
2402                                 struct splice_desc *sd)
2403 {
2404         int ret;
2405
2406         ret = ocfs2_prepare_inode_for_write(out, &sd->pos,
2407                                             sd->total_len, 0, NULL, NULL);
2408         if (ret < 0) {
2409                 mlog_errno(ret);
2410                 return ret;
2411         }
2412
2413         return splice_from_pipe_feed(pipe, sd, pipe_to_file);
2414 }
2415
2416 static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2417                                        struct file *out,
2418                                        loff_t *ppos,
2419                                        size_t len,
2420                                        unsigned int flags)
2421 {
2422         int ret;
2423         struct address_space *mapping = out->f_mapping;
2424         struct inode *inode = mapping->host;
2425         struct splice_desc sd = {
2426                 .total_len = len,
2427                 .flags = flags,
2428                 .pos = *ppos,
2429                 .u.file = out,
2430         };
2431
2432         mlog(0, "(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
2433              (unsigned int)len,
2434              out->f_path.dentry->d_name.len,
2435              out->f_path.dentry->d_name.name);
2436
2437         if (pipe->inode)
2438                 mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT);
2439
2440         splice_from_pipe_begin(&sd);
2441         do {
2442                 ret = splice_from_pipe_next(pipe, &sd);
2443                 if (ret <= 0)
2444                         break;
2445
2446                 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2447                 ret = ocfs2_rw_lock(inode, 1);
2448                 if (ret < 0)
2449                         mlog_errno(ret);
2450                 else {
2451                         ret = ocfs2_splice_to_file(pipe, out, &sd);
2452                         ocfs2_rw_unlock(inode, 1);
2453                 }
2454                 mutex_unlock(&inode->i_mutex);
2455         } while (ret > 0);
2456         splice_from_pipe_end(pipe, &sd);
2457
2458         if (pipe->inode)
2459                 mutex_unlock(&pipe->inode->i_mutex);
2460
2461         if (sd.num_spliced)
2462                 ret = sd.num_spliced;
2463
2464         if (ret > 0) {
2465                 unsigned long nr_pages;
2466                 int err;
2467
2468                 nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
2469
2470                 err = generic_write_sync(out, *ppos, ret);
2471                 if (err)
2472                         ret = err;
2473                 else
2474                         *ppos += ret;
2475
2476                 balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
2477         }
2478
2479         mlog_exit(ret);
2480         return ret;
2481 }
2482
2483 static ssize_t ocfs2_file_splice_read(struct file *in,
2484                                       loff_t *ppos,
2485                                       struct pipe_inode_info *pipe,
2486                                       size_t len,
2487                                       unsigned int flags)
2488 {
2489         int ret = 0, lock_level = 0;
2490         struct inode *inode = in->f_path.dentry->d_inode;
2491
2492         mlog(0, "(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
2493              (unsigned int)len,
2494              in->f_path.dentry->d_name.len,
2495              in->f_path.dentry->d_name.name);
2496
2497         /*
2498          * See the comment in ocfs2_file_aio_read()
2499          */
2500         ret = ocfs2_inode_lock_atime(inode, in->f_vfsmnt, &lock_level);
2501         if (ret < 0) {
2502                 mlog_errno(ret);
2503                 goto bail;
2504         }
2505         ocfs2_inode_unlock(inode, lock_level);
2506
2507         ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2508
2509 bail:
2510         mlog_exit(ret);
2511         return ret;
2512 }
2513
2514 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2515                                    const struct iovec *iov,
2516                                    unsigned long nr_segs,
2517                                    loff_t pos)
2518 {
2519         int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2520         struct file *filp = iocb->ki_filp;
2521         struct inode *inode = filp->f_path.dentry->d_inode;
2522
2523         mlog(0, "(0x%p, %u, '%.*s')\n", filp,
2524              (unsigned int)nr_segs,
2525              filp->f_path.dentry->d_name.len,
2526              filp->f_path.dentry->d_name.name);
2527
2528         if (!inode) {
2529                 ret = -EINVAL;
2530                 mlog_errno(ret);
2531                 goto bail;
2532         }
2533
2534         ocfs2_iocb_clear_sem_locked(iocb);
2535
2536         /*
2537          * buffered reads protect themselves in ->readpage().  O_DIRECT reads
2538          * need locks to protect pending reads from racing with truncate.
2539          */
2540         if (filp->f_flags & O_DIRECT) {
2541                 down_read(&inode->i_alloc_sem);
2542                 have_alloc_sem = 1;
2543                 ocfs2_iocb_set_sem_locked(iocb);
2544
2545                 ret = ocfs2_rw_lock(inode, 0);
2546                 if (ret < 0) {
2547                         mlog_errno(ret);
2548                         goto bail;
2549                 }
2550                 rw_level = 0;
2551                 /* communicate with ocfs2_dio_end_io */
2552                 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2553         }
2554
2555         /*
2556          * We're fine letting folks race truncates and extending
2557          * writes with read across the cluster, just like they can
2558          * locally. Hence no rw_lock during read.
2559          *
2560          * Take and drop the meta data lock to update inode fields
2561          * like i_size. This allows the checks down below
2562          * generic_file_aio_read() a chance of actually working.
2563          */
2564         ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2565         if (ret < 0) {
2566                 mlog_errno(ret);
2567                 goto bail;
2568         }
2569         ocfs2_inode_unlock(inode, lock_level);
2570
2571         ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2572         if (ret == -EINVAL)
2573                 mlog(0, "generic_file_aio_read returned -EINVAL\n");
2574
2575         /* buffered aio wouldn't have proper lock coverage today */
2576         BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2577
2578         /* see ocfs2_file_aio_write */
2579         if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2580                 rw_level = -1;
2581                 have_alloc_sem = 0;
2582         }
2583
2584 bail:
2585         if (have_alloc_sem) {
2586                 up_read(&inode->i_alloc_sem);
2587                 ocfs2_iocb_clear_sem_locked(iocb);
2588         }
2589         if (rw_level != -1)
2590                 ocfs2_rw_unlock(inode, rw_level);
2591         mlog_exit(ret);
2592
2593         return ret;
2594 }
2595
2596 const struct inode_operations ocfs2_file_iops = {
2597         .setattr        = ocfs2_setattr,
2598         .getattr        = ocfs2_getattr,
2599         .permission     = ocfs2_permission,
2600         .setxattr       = generic_setxattr,
2601         .getxattr       = generic_getxattr,
2602         .listxattr      = ocfs2_listxattr,
2603         .removexattr    = generic_removexattr,
2604         .fiemap         = ocfs2_fiemap,
2605 };
2606
2607 const struct inode_operations ocfs2_special_file_iops = {
2608         .setattr        = ocfs2_setattr,
2609         .getattr        = ocfs2_getattr,
2610         .permission     = ocfs2_permission,
2611 };
2612
2613 /*
2614  * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2615  * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2616  */
2617 const struct file_operations ocfs2_fops = {
2618         .llseek         = generic_file_llseek,
2619         .read           = do_sync_read,
2620         .write          = do_sync_write,
2621         .mmap           = ocfs2_mmap,
2622         .fsync          = ocfs2_sync_file,
2623         .release        = ocfs2_file_release,
2624         .open           = ocfs2_file_open,
2625         .aio_read       = ocfs2_file_aio_read,
2626         .aio_write      = ocfs2_file_aio_write,
2627         .unlocked_ioctl = ocfs2_ioctl,
2628 #ifdef CONFIG_COMPAT
2629         .compat_ioctl   = ocfs2_compat_ioctl,
2630 #endif
2631         .lock           = ocfs2_lock,
2632         .flock          = ocfs2_flock,
2633         .splice_read    = ocfs2_file_splice_read,
2634         .splice_write   = ocfs2_file_splice_write,
2635         .fallocate      = ocfs2_fallocate,
2636 };
2637
2638 const struct file_operations ocfs2_dops = {
2639         .llseek         = generic_file_llseek,
2640         .read           = generic_read_dir,
2641         .readdir        = ocfs2_readdir,
2642         .fsync          = ocfs2_sync_file,
2643         .release        = ocfs2_dir_release,
2644         .open           = ocfs2_dir_open,
2645         .unlocked_ioctl = ocfs2_ioctl,
2646 #ifdef CONFIG_COMPAT
2647         .compat_ioctl   = ocfs2_compat_ioctl,
2648 #endif
2649         .lock           = ocfs2_lock,
2650         .flock          = ocfs2_flock,
2651 };
2652
2653 /*
2654  * POSIX-lockless variants of our file_operations.
2655  *
2656  * These will be used if the underlying cluster stack does not support
2657  * posix file locking, if the user passes the "localflocks" mount
2658  * option, or if we have a local-only fs.
2659  *
2660  * ocfs2_flock is in here because all stacks handle UNIX file locks,
2661  * so we still want it in the case of no stack support for
2662  * plocks. Internally, it will do the right thing when asked to ignore
2663  * the cluster.
2664  */
2665 const struct file_operations ocfs2_fops_no_plocks = {
2666         .llseek         = generic_file_llseek,
2667         .read           = do_sync_read,
2668         .write          = do_sync_write,
2669         .mmap           = ocfs2_mmap,
2670         .fsync          = ocfs2_sync_file,
2671         .release        = ocfs2_file_release,
2672         .open           = ocfs2_file_open,
2673         .aio_read       = ocfs2_file_aio_read,
2674         .aio_write      = ocfs2_file_aio_write,
2675         .unlocked_ioctl = ocfs2_ioctl,
2676 #ifdef CONFIG_COMPAT
2677         .compat_ioctl   = ocfs2_compat_ioctl,
2678 #endif
2679         .flock          = ocfs2_flock,
2680         .splice_read    = ocfs2_file_splice_read,
2681         .splice_write   = ocfs2_file_splice_write,
2682 };
2683
2684 const struct file_operations ocfs2_dops_no_plocks = {
2685         .llseek         = generic_file_llseek,
2686         .read           = generic_read_dir,
2687         .readdir        = ocfs2_readdir,
2688         .fsync          = ocfs2_sync_file,
2689         .release        = ocfs2_dir_release,
2690         .open           = ocfs2_dir_open,
2691         .unlocked_ioctl = ocfs2_ioctl,
2692 #ifdef CONFIG_COMPAT
2693         .compat_ioctl   = ocfs2_compat_ioctl,
2694 #endif
2695         .flock          = ocfs2_flock,
2696 };