fs/ocfs2/file.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * file.c
   4  *
   5  * File open, close, extend, truncate
   6  *
   7  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   8  */
   9
  10 #include <linux/capability.h>
  11 #include <linux/fs.h>
  12 #include <linux/types.h>
  13 #include <linux/slab.h>
  14 #include <linux/highmem.h>
  15 #include <linux/pagemap.h>
  16 #include <linux/uio.h>
  17 #include <linux/sched.h>
  18 #include <linux/splice.h>
  19 #include <linux/mount.h>
  20 #include <linux/writeback.h>
  21 #include <linux/falloc.h>
  22 #include <linux/quotaops.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/backing-dev.h>
  25
  26 #include <cluster/masklog.h>
  27
  28 #include "ocfs2.h"
  29
  30 #include "alloc.h"
  31 #include "aops.h"
  32 #include "dir.h"
  33 #include "dlmglue.h"
  34 #include "extent_map.h"
  35 #include "file.h"
  36 #include "sysfile.h"
  37 #include "inode.h"
  38 #include "ioctl.h"
  39 #include "journal.h"
  40 #include "locks.h"
  41 #include "mmap.h"
  42 #include "suballoc.h"
  43 #include "super.h"
  44 #include "xattr.h"
  45 #include "acl.h"
  46 #include "quota.h"
  47 #include "refcounttree.h"
  48 #include "ocfs2_trace.h"
  49
  50 #include "buffer_head_io.h"
  51
  52 static int ocfs2_init_file_private(struct inode *inode, struct file *file)
  53 {
  54         struct ocfs2_file_private *fp;
  55
  56         fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
  57         if (!fp)
  58                 return -ENOMEM;
  59
  60         fp->fp_file = file;
  61         mutex_init(&fp->fp_mutex);
  62         ocfs2_file_lock_res_init(&fp->fp_flock, fp);
  63         file->private_data = fp;
  64
  65         return 0;
  66 }
  67
  68 static void ocfs2_free_file_private(struct inode *inode, struct file *file)
  69 {
  70         struct ocfs2_file_private *fp = file->private_data;
  71         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  72
  73         if (fp) {
  74                 ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
  75                 ocfs2_lock_res_free(&fp->fp_flock);
  76                 kfree(fp);
  77                 file->private_data = NULL;
  78         }
  79 }
  80
  81 static int ocfs2_file_open(struct inode *inode, struct file *file)
  82 {
  83         int status;
  84         int mode = file->f_flags;
  85         struct ocfs2_inode_info *oi = OCFS2_I(inode);
  86
  87         trace_ocfs2_file_open(inode, file, file->f_path.dentry,
  88                               (unsigned long long)oi->ip_blkno,
  89                               file->f_path.dentry->d_name.len,
  90                               file->f_path.dentry->d_name.name, mode);
  91
  92         if (file->f_mode & FMODE_WRITE) {
  93                 status = dquot_initialize(inode);
  94                 if (status)
  95                         goto leave;
  96         }
  97
  98         spin_lock(&oi->ip_lock);
  99
 100         /* Check that the inode hasn't been wiped from disk by another
 101          * node. If it hasn't then we're safe as long as we hold the
 102          * spin lock until our increment of open count. */
 103         if (oi->ip_flags & OCFS2_INODE_DELETED) {
 104                 spin_unlock(&oi->ip_lock);
 105
 106                 status = -ENOENT;
 107                 goto leave;
 108         }
 109
 110         if (mode & O_DIRECT)
 111                 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
 112
 113         oi->ip_open_count++;
 114         spin_unlock(&oi->ip_lock);
 115
 116         status = ocfs2_init_file_private(inode, file);
 117         if (status) {
 118                 /*
 119                  * We want to set open count back if we're failing the
 120                  * open.
 121                  */
 122                 spin_lock(&oi->ip_lock);
 123                 oi->ip_open_count--;
 124                 spin_unlock(&oi->ip_lock);
 125         }
 126
 127         file->f_mode |= FMODE_NOWAIT;
 128
 129 leave:
 130         return status;
 131 }
 132
 133 static int ocfs2_file_release(struct inode *inode, struct file *file)
 134 {
 135         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 136
 137         spin_lock(&oi->ip_lock);
 138         if (!--oi->ip_open_count)
 139                 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
 140
 141         trace_ocfs2_file_release(inode, file, file->f_path.dentry,
 142                                  oi->ip_blkno,
 143                                  file->f_path.dentry->d_name.len,
 144                                  file->f_path.dentry->d_name.name,
 145                                  oi->ip_open_count);
 146         spin_unlock(&oi->ip_lock);
 147
 148         ocfs2_free_file_private(inode, file);
 149
 150         return 0;
 151 }
 152
 153 static int ocfs2_dir_open(struct inode *inode, struct file *file)
 154 {
 155         return ocfs2_init_file_private(inode, file);
 156 }
 157
 158 static int ocfs2_dir_release(struct inode *inode, struct file *file)
 159 {
 160         ocfs2_free_file_private(inode, file);
 161         return 0;
 162 }
 163
 164 static int ocfs2_sync_file(struct file *file, loff_t start, loff_t end,
 165                            int datasync)
 166 {
 167         int err = 0;
 168         struct inode *inode = file->f_mapping->host;
 169         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 170         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 171         journal_t *journal = osb->journal->j_journal;
 172         int ret;
 173         tid_t commit_tid;
 174         bool needs_barrier = false;
 175
 176         trace_ocfs2_sync_file(inode, file, file->f_path.dentry,
 177                               oi->ip_blkno,
 178                               file->f_path.dentry->d_name.len,
 179                               file->f_path.dentry->d_name.name,
 180                               (unsigned long long)datasync);
 181
 182         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 183                 return -EROFS;
 184
 185         err = file_write_and_wait_range(file, start, end);
 186         if (err)
 187                 return err;
 188
 189         commit_tid = datasync ? oi->i_datasync_tid : oi->i_sync_tid;
 190         if (journal->j_flags & JBD2_BARRIER &&
 191             !jbd2_trans_will_send_data_barrier(journal, commit_tid))
 192                 needs_barrier = true;
 193         err = jbd2_complete_transaction(journal, commit_tid);
 194         if (needs_barrier) {
 195                 ret = blkdev_issue_flush(inode->i_sb->s_bdev);
 196                 if (!err)
 197                         err = ret;
 198         }
 199
 200         if (err)
 201                 mlog_errno(err);
 202
 203         return (err < 0) ? -EIO : 0;
 204 }
 205
 206 int ocfs2_should_update_atime(struct inode *inode,
 207                               struct vfsmount *vfsmnt)
 208 {
 209         struct timespec64 now;
 210         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 211
 212         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 213                 return 0;
 214
 215         if ((inode->i_flags & S_NOATIME) ||
 216             ((inode->i_sb->s_flags & SB_NODIRATIME) && S_ISDIR(inode->i_mode)))
 217                 return 0;
 218
 219         /*
 220          * We can be called with no vfsmnt structure - NFSD will
 221          * sometimes do this.
 222          *
 223          * Note that our action here is different than touch_atime() -
 224          * if we can't tell whether this is a noatime mount, then we
 225          * don't know whether to trust the value of s_atime_quantum.
 226          */
 227         if (vfsmnt == NULL)
 228                 return 0;
 229
 230         if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
 231             ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 232                 return 0;
 233
 234         if (vfsmnt->mnt_flags & MNT_RELATIME) {
 235                 struct timespec64 ctime = inode_get_ctime(inode);
 236                 struct timespec64 atime = inode_get_atime(inode);
 237                 struct timespec64 mtime = inode_get_mtime(inode);
 238
 239                 if ((timespec64_compare(&atime, &mtime) <= 0) ||
 240                     (timespec64_compare(&atime, &ctime) <= 0))
 241                         return 1;
 242
 243                 return 0;
 244         }
 245
 246         now = current_time(inode);
 247         if ((now.tv_sec - inode_get_atime_sec(inode) <= osb->s_atime_quantum))
 248                 return 0;
 249         else
 250                 return 1;
 251 }
 252
 253 int ocfs2_update_inode_atime(struct inode *inode,
 254                              struct buffer_head *bh)
 255 {
 256         int ret;
 257         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 258         handle_t *handle;
 259         struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
 260
 261         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 262         if (IS_ERR(handle)) {
 263                 ret = PTR_ERR(handle);
 264                 mlog_errno(ret);
 265                 goto out;
 266         }
 267
 268         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 269                                       OCFS2_JOURNAL_ACCESS_WRITE);
 270         if (ret) {
 271                 mlog_errno(ret);
 272                 goto out_commit;
 273         }
 274
 275         /*
 276          * Don't use ocfs2_mark_inode_dirty() here as we don't always
 277          * have i_rwsem to guard against concurrent changes to other
 278          * inode fields.
 279          */
 280         inode_set_atime_to_ts(inode, current_time(inode));
 281         di->i_atime = cpu_to_le64(inode_get_atime_sec(inode));
 282         di->i_atime_nsec = cpu_to_le32(inode_get_atime_nsec(inode));
 283         ocfs2_update_inode_fsync_trans(handle, inode, 0);
 284         ocfs2_journal_dirty(handle, bh);
 285
 286 out_commit:
 287         ocfs2_commit_trans(osb, handle);
 288 out:
 289         return ret;
 290 }
 291
 292 int ocfs2_set_inode_size(handle_t *handle,
 293                                 struct inode *inode,
 294                                 struct buffer_head *fe_bh,
 295                                 u64 new_i_size)
 296 {
 297         int status;
 298
 299         i_size_write(inode, new_i_size);
 300         inode->i_blocks = ocfs2_inode_sector_count(inode);
 301         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 302
 303         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 304         if (status < 0) {
 305                 mlog_errno(status);
 306                 goto bail;
 307         }
 308
 309 bail:
 310         return status;
 311 }
 312
 313 int ocfs2_simple_size_update(struct inode *inode,
 314                              struct buffer_head *di_bh,
 315                              u64 new_i_size)
 316 {
 317         int ret;
 318         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 319         handle_t *handle = NULL;
 320
 321         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 322         if (IS_ERR(handle)) {
 323                 ret = PTR_ERR(handle);
 324                 mlog_errno(ret);
 325                 goto out;
 326         }
 327
 328         ret = ocfs2_set_inode_size(handle, inode, di_bh,
 329                                    new_i_size);
 330         if (ret < 0)
 331                 mlog_errno(ret);
 332
 333         ocfs2_update_inode_fsync_trans(handle, inode, 0);
 334         ocfs2_commit_trans(osb, handle);
 335 out:
 336         return ret;
 337 }
 338
 339 static int ocfs2_cow_file_pos(struct inode *inode,
 340                               struct buffer_head *fe_bh,
 341                               u64 offset)
 342 {
 343         int status;
 344         u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 345         unsigned int num_clusters = 0;
 346         unsigned int ext_flags = 0;
 347
 348         /*
 349          * If the new offset is aligned to the range of the cluster, there is
 350          * no space for ocfs2_zero_range_for_truncate to fill, so no need to
 351          * CoW either.
 352          */
 353         if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
 354                 return 0;
 355
 356         status = ocfs2_get_clusters(inode, cpos, &phys,
 357                                     &num_clusters, &ext_flags);
 358         if (status) {
 359                 mlog_errno(status);
 360                 goto out;
 361         }
 362
 363         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
 364                 goto out;
 365
 366         return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1);
 367
 368 out:
 369         return status;
 370 }
 371
 372 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
 373                                      struct inode *inode,
 374                                      struct buffer_head *fe_bh,
 375                                      u64 new_i_size)
 376 {
 377         int status;
 378         handle_t *handle;
 379         struct ocfs2_dinode *di;
 380         u64 cluster_bytes;
 381
 382         /*
 383          * We need to CoW the cluster contains the offset if it is reflinked
 384          * since we will call ocfs2_zero_range_for_truncate later which will
 385          * write "0" from offset to the end of the cluster.
 386          */
 387         status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
 388         if (status) {
 389                 mlog_errno(status);
 390                 return status;
 391         }
 392
 393         /* TODO: This needs to actually orphan the inode in this
 394          * transaction. */
 395
 396         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 397         if (IS_ERR(handle)) {
 398                 status = PTR_ERR(handle);
 399                 mlog_errno(status);
 400                 goto out;
 401         }
 402
 403         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 404                                          OCFS2_JOURNAL_ACCESS_WRITE);
 405         if (status < 0) {
 406                 mlog_errno(status);
 407                 goto out_commit;
 408         }
 409
 410         /*
 411          * Do this before setting i_size.
 412          */
 413         cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
 414         status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
 415                                                cluster_bytes);
 416         if (status) {
 417                 mlog_errno(status);
 418                 goto out_commit;
 419         }
 420
 421         i_size_write(inode, new_i_size);
 422         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 423
 424         di = (struct ocfs2_dinode *) fe_bh->b_data;
 425         di->i_size = cpu_to_le64(new_i_size);
 426         di->i_ctime = di->i_mtime = cpu_to_le64(inode_get_ctime_sec(inode));
 427         di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode_get_ctime_nsec(inode));
 428         ocfs2_update_inode_fsync_trans(handle, inode, 0);
 429
 430         ocfs2_journal_dirty(handle, fe_bh);
 431
 432 out_commit:
 433         ocfs2_commit_trans(osb, handle);
 434 out:
 435         return status;
 436 }
 437
 438 int ocfs2_truncate_file(struct inode *inode,
 439                                struct buffer_head *di_bh,
 440                                u64 new_i_size)
 441 {
 442         int status = 0;
 443         struct ocfs2_dinode *fe = NULL;
 444         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 445
 446         /* We trust di_bh because it comes from ocfs2_inode_lock(), which
 447          * already validated it */
 448         fe = (struct ocfs2_dinode *) di_bh->b_data;
 449
 450         trace_ocfs2_truncate_file((unsigned long long)OCFS2_I(inode)->ip_blkno,
 451                                   (unsigned long long)le64_to_cpu(fe->i_size),
 452                                   (unsigned long long)new_i_size);
 453
 454         mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
 455                         "Inode %llu, inode i_size = %lld != di "
 456                         "i_size = %llu, i_flags = 0x%x\n",
 457                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 458                         i_size_read(inode),
 459                         (unsigned long long)le64_to_cpu(fe->i_size),
 460                         le32_to_cpu(fe->i_flags));
 461
 462         if (new_i_size > le64_to_cpu(fe->i_size)) {
 463                 trace_ocfs2_truncate_file_error(
 464                         (unsigned long long)le64_to_cpu(fe->i_size),
 465                         (unsigned long long)new_i_size);
 466                 status = -EINVAL;
 467                 mlog_errno(status);
 468                 goto bail;
 469         }
 470
 471         down_write(&OCFS2_I(inode)->ip_alloc_sem);
 472
 473         ocfs2_resv_discard(&osb->osb_la_resmap,
 474                            &OCFS2_I(inode)->ip_la_data_resv);
 475
 476         /*
 477          * The inode lock forced other nodes to sync and drop their
 478          * pages, which (correctly) happens even if we have a truncate
 479          * without allocation change - ocfs2 cluster sizes can be much
 480          * greater than page size, so we have to truncate them
 481          * anyway.
 482          */
 483
 484         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
 485                 unmap_mapping_range(inode->i_mapping,
 486                                     new_i_size + PAGE_SIZE - 1, 0, 1);
 487                 truncate_inode_pages(inode->i_mapping, new_i_size);
 488                 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
 489                                                i_size_read(inode), 1);
 490                 if (status)
 491                         mlog_errno(status);
 492
 493                 goto bail_unlock_sem;
 494         }
 495
 496         /* alright, we're going to need to do a full blown alloc size
 497          * change. Orphan the inode so that recovery can complete the
 498          * truncate if necessary. This does the task of marking
 499          * i_size. */
 500         status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
 501         if (status < 0) {
 502                 mlog_errno(status);
 503                 goto bail_unlock_sem;
 504         }
 505
 506         unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
 507         truncate_inode_pages(inode->i_mapping, new_i_size);
 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         return status;
 524 }
 525
 526 /*
 527  * extend file allocation only here.
 528  * we'll update all the disk stuff, and oip->alloc_size
 529  *
 530  * expect stuff to be locked, a transaction started and enough data /
 531  * metadata reservations in the contexts.
 532  *
 533  * Will return -EAGAIN, and a reason if a restart is needed.
 534  * If passed in, *reason will always be set, even in error.
 535  */
 536 int ocfs2_add_inode_data(struct ocfs2_super *osb,
 537                          struct inode *inode,
 538                          u32 *logical_offset,
 539                          u32 clusters_to_add,
 540                          int mark_unwritten,
 541                          struct buffer_head *fe_bh,
 542                          handle_t *handle,
 543                          struct ocfs2_alloc_context *data_ac,
 544                          struct ocfs2_alloc_context *meta_ac,
 545                          enum ocfs2_alloc_restarted *reason_ret)
 546 {
 547         struct ocfs2_extent_tree et;
 548
 549         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
 550         return ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
 551                                            clusters_to_add, mark_unwritten,
 552                                            data_ac, meta_ac, reason_ret);
 553 }
 554
 555 static int ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
 556                                    u32 clusters_to_add, int mark_unwritten)
 557 {
 558         int status = 0;
 559         int restart_func = 0;
 560         int credits;
 561         u32 prev_clusters;
 562         struct buffer_head *bh = NULL;
 563         struct ocfs2_dinode *fe = NULL;
 564         handle_t *handle = NULL;
 565         struct ocfs2_alloc_context *data_ac = NULL;
 566         struct ocfs2_alloc_context *meta_ac = NULL;
 567         enum ocfs2_alloc_restarted why = RESTART_NONE;
 568         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 569         struct ocfs2_extent_tree et;
 570         int did_quota = 0;
 571
 572         /*
 573          * Unwritten extent only exists for file systems which
 574          * support holes.
 575          */
 576         BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
 577
 578         status = ocfs2_read_inode_block(inode, &bh);
 579         if (status < 0) {
 580                 mlog_errno(status);
 581                 goto leave;
 582         }
 583         fe = (struct ocfs2_dinode *) bh->b_data;
 584
 585 restart_all:
 586         BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
 587
 588         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
 589         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 590                                        &data_ac, &meta_ac);
 591         if (status) {
 592                 mlog_errno(status);
 593                 goto leave;
 594         }
 595
 596         credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list);
 597         handle = ocfs2_start_trans(osb, credits);
 598         if (IS_ERR(handle)) {
 599                 status = PTR_ERR(handle);
 600                 handle = NULL;
 601                 mlog_errno(status);
 602                 goto leave;
 603         }
 604
 605 restarted_transaction:
 606         trace_ocfs2_extend_allocation(
 607                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
 608                 (unsigned long long)i_size_read(inode),
 609                 le32_to_cpu(fe->i_clusters), clusters_to_add,
 610                 why, restart_func);
 611
 612         status = dquot_alloc_space_nodirty(inode,
 613                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 614         if (status)
 615                 goto leave;
 616         did_quota = 1;
 617
 618         /* reserve a write to the file entry early on - that we if we
 619          * run out of credits in the allocation path, we can still
 620          * update i_size. */
 621         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 622                                          OCFS2_JOURNAL_ACCESS_WRITE);
 623         if (status < 0) {
 624                 mlog_errno(status);
 625                 goto leave;
 626         }
 627
 628         prev_clusters = OCFS2_I(inode)->ip_clusters;
 629
 630         status = ocfs2_add_inode_data(osb,
 631                                       inode,
 632                                       &logical_start,
 633                                       clusters_to_add,
 634                                       mark_unwritten,
 635                                       bh,
 636                                       handle,
 637                                       data_ac,
 638                                       meta_ac,
 639                                       &why);
 640         if ((status < 0) && (status != -EAGAIN)) {
 641                 if (status != -ENOSPC)
 642                         mlog_errno(status);
 643                 goto leave;
 644         }
 645         ocfs2_update_inode_fsync_trans(handle, inode, 1);
 646         ocfs2_journal_dirty(handle, bh);
 647
 648         spin_lock(&OCFS2_I(inode)->ip_lock);
 649         clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
 650         spin_unlock(&OCFS2_I(inode)->ip_lock);
 651         /* Release unused quota reservation */
 652         dquot_free_space(inode,
 653                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 654         did_quota = 0;
 655
 656         if (why != RESTART_NONE && clusters_to_add) {
 657                 if (why == RESTART_META) {
 658                         restart_func = 1;
 659                         status = 0;
 660                 } else {
 661                         BUG_ON(why != RESTART_TRANS);
 662
 663                         status = ocfs2_allocate_extend_trans(handle, 1);
 664                         if (status < 0) {
 665                                 /* handle still has to be committed at
 666                                  * this point. */
 667                                 status = -ENOMEM;
 668                                 mlog_errno(status);
 669                                 goto leave;
 670                         }
 671                         goto restarted_transaction;
 672                 }
 673         }
 674
 675         trace_ocfs2_extend_allocation_end(OCFS2_I(inode)->ip_blkno,
 676              le32_to_cpu(fe->i_clusters),
 677              (unsigned long long)le64_to_cpu(fe->i_size),
 678              OCFS2_I(inode)->ip_clusters,
 679              (unsigned long long)i_size_read(inode));
 680
 681 leave:
 682         if (status < 0 && did_quota)
 683                 dquot_free_space(inode,
 684                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 685         if (handle) {
 686                 ocfs2_commit_trans(osb, handle);
 687                 handle = NULL;
 688         }
 689         if (data_ac) {
 690                 ocfs2_free_alloc_context(data_ac);
 691                 data_ac = NULL;
 692         }
 693         if (meta_ac) {
 694                 ocfs2_free_alloc_context(meta_ac);
 695                 meta_ac = NULL;
 696         }
 697         if ((!status) && restart_func) {
 698                 restart_func = 0;
 699                 goto restart_all;
 700         }
 701         brelse(bh);
 702         bh = NULL;
 703
 704         return status;
 705 }
 706
 707 /*
 708  * While a write will already be ordering the data, a truncate will not.
 709  * Thus, we need to explicitly order the zeroed pages.
 710  */
 711 static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode,
 712                                                       struct buffer_head *di_bh,
 713                                                       loff_t start_byte,
 714                                                       loff_t length)
 715 {
 716         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 717         handle_t *handle = NULL;
 718         int ret = 0;
 719
 720         if (!ocfs2_should_order_data(inode))
 721                 goto out;
 722
 723         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 724         if (IS_ERR(handle)) {
 725                 ret = -ENOMEM;
 726                 mlog_errno(ret);
 727                 goto out;
 728         }
 729
 730         ret = ocfs2_jbd2_inode_add_write(handle, inode, start_byte, length);
 731         if (ret < 0) {
 732                 mlog_errno(ret);
 733                 goto out;
 734         }
 735
 736         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
 737                                       OCFS2_JOURNAL_ACCESS_WRITE);
 738         if (ret)
 739                 mlog_errno(ret);
 740         ocfs2_update_inode_fsync_trans(handle, inode, 1);
 741
 742 out:
 743         if (ret) {
 744                 if (!IS_ERR(handle))
 745                         ocfs2_commit_trans(osb, handle);
 746                 handle = ERR_PTR(ret);
 747         }
 748         return handle;
 749 }
 750
 751 /* Some parts of this taken from generic_cont_expand, which turned out
 752  * to be too fragile to do exactly what we need without us having to
 753  * worry about recursive locking in ->write_begin() and ->write_end(). */
 754 static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
 755                                  u64 abs_to, struct buffer_head *di_bh)
 756 {
 757         struct address_space *mapping = inode->i_mapping;
 758         struct folio *folio;
 759         unsigned long index = abs_from >> PAGE_SHIFT;
 760         handle_t *handle;
 761         int ret = 0;
 762         unsigned zero_from, zero_to, block_start, block_end;
 763         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
 764
 765         BUG_ON(abs_from >= abs_to);
 766         BUG_ON(abs_to > (((u64)index + 1) << PAGE_SHIFT));
 767         BUG_ON(abs_from & (inode->i_blkbits - 1));
 768
 769         handle = ocfs2_zero_start_ordered_transaction(inode, di_bh,
 770                                                       abs_from,
 771                                                       abs_to - abs_from);
 772         if (IS_ERR(handle)) {
 773                 ret = PTR_ERR(handle);
 774                 goto out;
 775         }
 776
 777         folio = __filemap_get_folio(mapping, index,
 778                         FGP_LOCK | FGP_ACCESSED | FGP_CREAT, GFP_NOFS);
 779         if (IS_ERR(folio)) {
 780                 ret = PTR_ERR(folio);
 781                 mlog_errno(ret);
 782                 goto out_commit_trans;
 783         }
 784
 785         /* Get the offsets within the page that we want to zero */
 786         zero_from = abs_from & (PAGE_SIZE - 1);
 787         zero_to = abs_to & (PAGE_SIZE - 1);
 788         if (!zero_to)
 789                 zero_to = PAGE_SIZE;
 790
 791         trace_ocfs2_write_zero_page(
 792                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 793                         (unsigned long long)abs_from,
 794                         (unsigned long long)abs_to,
 795                         index, zero_from, zero_to);
 796
 797         /* We know that zero_from is block aligned */
 798         for (block_start = zero_from; block_start < zero_to;
 799              block_start = block_end) {
 800                 block_end = block_start + i_blocksize(inode);
 801
 802                 /*
 803                  * block_start is block-aligned.  Bump it by one to force
 804                  * __block_write_begin and block_commit_write to zero the
 805                  * whole block.
 806                  */
 807                 ret = __block_write_begin(folio, block_start + 1, 0,
 808                                           ocfs2_get_block);
 809                 if (ret < 0) {
 810                         mlog_errno(ret);
 811                         goto out_unlock;
 812                 }
 813
 814
 815                 /* must not update i_size! */
 816                 block_commit_write(&folio->page, block_start + 1, block_start + 1);
 817         }
 818
 819         /*
 820          * fs-writeback will release the dirty pages without page lock
 821          * whose offset are over inode size, the release happens at
 822          * block_write_full_folio().
 823          */
 824         i_size_write(inode, abs_to);
 825         inode->i_blocks = ocfs2_inode_sector_count(inode);
 826         di->i_size = cpu_to_le64((u64)i_size_read(inode));
 827         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 828         di->i_mtime = di->i_ctime = cpu_to_le64(inode_get_mtime_sec(inode));
 829         di->i_ctime_nsec = cpu_to_le32(inode_get_mtime_nsec(inode));
 830         di->i_mtime_nsec = di->i_ctime_nsec;
 831         if (handle) {
 832                 ocfs2_journal_dirty(handle, di_bh);
 833                 ocfs2_update_inode_fsync_trans(handle, inode, 1);
 834         }
 835
 836 out_unlock:
 837         folio_unlock(folio);
 838         folio_put(folio);
 839 out_commit_trans:
 840         if (handle)
 841                 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 842 out:
 843         return ret;
 844 }
 845
 846 /*
 847  * Find the next range to zero.  We do this in terms of bytes because
 848  * that's what ocfs2_zero_extend() wants, and it is dealing with the
 849  * pagecache.  We may return multiple extents.
 850  *
 851  * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
 852  * needs to be zeroed.  range_start and range_end return the next zeroing
 853  * range.  A subsequent call should pass the previous range_end as its
 854  * zero_start.  If range_end is 0, there's nothing to do.
 855  *
 856  * Unwritten extents are skipped over.  Refcounted extents are CoWd.
 857  */
 858 static int ocfs2_zero_extend_get_range(struct inode *inode,
 859                                        struct buffer_head *di_bh,
 860                                        u64 zero_start, u64 zero_end,
 861                                        u64 *range_start, u64 *range_end)
 862 {
 863         int rc = 0, needs_cow = 0;
 864         u32 p_cpos, zero_clusters = 0;
 865         u32 zero_cpos =
 866                 zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 867         u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
 868         unsigned int num_clusters = 0;
 869         unsigned int ext_flags = 0;
 870
 871         while (zero_cpos < last_cpos) {
 872                 rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
 873                                         &num_clusters, &ext_flags);
 874                 if (rc) {
 875                         mlog_errno(rc);
 876                         goto out;
 877                 }
 878
 879                 if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
 880                         zero_clusters = num_clusters;
 881                         if (ext_flags & OCFS2_EXT_REFCOUNTED)
 882                                 needs_cow = 1;
 883                         break;
 884                 }
 885
 886                 zero_cpos += num_clusters;
 887         }
 888         if (!zero_clusters) {
 889                 *range_end = 0;
 890                 goto out;
 891         }
 892
 893         while ((zero_cpos + zero_clusters) < last_cpos) {
 894                 rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
 895                                         &p_cpos, &num_clusters,
 896                                         &ext_flags);
 897                 if (rc) {
 898                         mlog_errno(rc);
 899                         goto out;
 900                 }
 901
 902                 if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
 903                         break;
 904                 if (ext_flags & OCFS2_EXT_REFCOUNTED)
 905                         needs_cow = 1;
 906                 zero_clusters += num_clusters;
 907         }
 908         if ((zero_cpos + zero_clusters) > last_cpos)
 909                 zero_clusters = last_cpos - zero_cpos;
 910
 911         if (needs_cow) {
 912                 rc = ocfs2_refcount_cow(inode, di_bh, zero_cpos,
 913                                         zero_clusters, UINT_MAX);
 914                 if (rc) {
 915                         mlog_errno(rc);
 916                         goto out;
 917                 }
 918         }
 919
 920         *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
 921         *range_end = ocfs2_clusters_to_bytes(inode->i_sb,
 922                                              zero_cpos + zero_clusters);
 923
 924 out:
 925         return rc;
 926 }
 927
 928 /*
 929  * Zero one range returned from ocfs2_zero_extend_get_range().  The caller
 930  * has made sure that the entire range needs zeroing.
 931  */
 932 static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
 933                                    u64 range_end, struct buffer_head *di_bh)
 934 {
 935         int rc = 0;
 936         u64 next_pos;
 937         u64 zero_pos = range_start;
 938
 939         trace_ocfs2_zero_extend_range(
 940                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 941                         (unsigned long long)range_start,
 942                         (unsigned long long)range_end);
 943         BUG_ON(range_start >= range_end);
 944
 945         while (zero_pos < range_end) {
 946                 next_pos = (zero_pos & PAGE_MASK) + PAGE_SIZE;
 947                 if (next_pos > range_end)
 948                         next_pos = range_end;
 949                 rc = ocfs2_write_zero_page(inode, zero_pos, next_pos, di_bh);
 950                 if (rc < 0) {
 951                         mlog_errno(rc);
 952                         break;
 953                 }
 954                 zero_pos = next_pos;
 955
 956                 /*
 957                  * Very large extends have the potential to lock up
 958                  * the cpu for extended periods of time.
 959                  */
 960                 cond_resched();
 961         }
 962
 963         return rc;
 964 }
 965
 966 int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
 967                       loff_t zero_to_size)
 968 {
 969         int ret = 0;
 970         u64 zero_start, range_start = 0, range_end = 0;
 971         struct super_block *sb = inode->i_sb;
 972
 973         zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
 974         trace_ocfs2_zero_extend((unsigned long long)OCFS2_I(inode)->ip_blkno,
 975                                 (unsigned long long)zero_start,
 976                                 (unsigned long long)i_size_read(inode));
 977         while (zero_start < zero_to_size) {
 978                 ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
 979                                                   zero_to_size,
 980                                                   &range_start,
 981                                                   &range_end);
 982                 if (ret) {
 983                         mlog_errno(ret);
 984                         break;
 985                 }
 986                 if (!range_end)
 987                         break;
 988                 /* Trim the ends */
 989                 if (range_start < zero_start)
 990                         range_start = zero_start;
 991                 if (range_end > zero_to_size)
 992                         range_end = zero_to_size;
 993
 994                 ret = ocfs2_zero_extend_range(inode, range_start,
 995                                               range_end, di_bh);
 996                 if (ret) {
 997                         mlog_errno(ret);
 998                         break;
 999                 }
1000                 zero_start = range_end;
1001         }
1002
1003         return ret;
1004 }
1005
1006 int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
1007                           u64 new_i_size, u64 zero_to)
1008 {
1009         int ret;
1010         u32 clusters_to_add;
1011         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1012
1013         /*
1014          * Only quota files call this without a bh, and they can't be
1015          * refcounted.
1016          */
1017         BUG_ON(!di_bh && ocfs2_is_refcount_inode(inode));
1018         BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
1019
1020         clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
1021         if (clusters_to_add < oi->ip_clusters)
1022                 clusters_to_add = 0;
1023         else
1024                 clusters_to_add -= oi->ip_clusters;
1025
1026         if (clusters_to_add) {
1027                 ret = ocfs2_extend_allocation(inode, oi->ip_clusters,
1028                                               clusters_to_add, 0);
1029                 if (ret) {
1030                         mlog_errno(ret);
1031                         goto out;
1032                 }
1033         }
1034
1035         /*
1036          * Call this even if we don't add any clusters to the tree. We
1037          * still need to zero the area between the old i_size and the
1038          * new i_size.
1039          */
1040         ret = ocfs2_zero_extend(inode, di_bh, zero_to);
1041         if (ret < 0)
1042                 mlog_errno(ret);
1043
1044 out:
1045         return ret;
1046 }
1047
1048 static int ocfs2_extend_file(struct inode *inode,
1049                              struct buffer_head *di_bh,
1050                              u64 new_i_size)
1051 {
1052         int ret = 0;
1053         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1054
1055         BUG_ON(!di_bh);
1056
1057         /* setattr sometimes calls us like this. */
1058         if (new_i_size == 0)
1059                 goto out;
1060
1061         if (i_size_read(inode) == new_i_size)
1062                 goto out;
1063         BUG_ON(new_i_size < i_size_read(inode));
1064
1065         /*
1066          * The alloc sem blocks people in read/write from reading our
1067          * allocation until we're done changing it. We depend on
1068          * i_rwsem to block other extend/truncate calls while we're
1069          * here.  We even have to hold it for sparse files because there
1070          * might be some tail zeroing.
1071          */
1072         down_write(&oi->ip_alloc_sem);
1073
1074         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1075                 /*
1076                  * We can optimize small extends by keeping the inodes
1077                  * inline data.
1078                  */
1079                 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1080                         up_write(&oi->ip_alloc_sem);
1081                         goto out_update_size;
1082                 }
1083
1084                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1085                 if (ret) {
1086                         up_write(&oi->ip_alloc_sem);
1087                         mlog_errno(ret);
1088                         goto out;
1089                 }
1090         }
1091
1092         if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1093                 ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1094         else
1095                 ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1096                                             new_i_size);
1097
1098         up_write(&oi->ip_alloc_sem);
1099
1100         if (ret < 0) {
1101                 mlog_errno(ret);
1102                 goto out;
1103         }
1104
1105 out_update_size:
1106         ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1107         if (ret < 0)
1108                 mlog_errno(ret);
1109
1110 out:
1111         return ret;
1112 }
1113
1114 int ocfs2_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
1115                   struct iattr *attr)
1116 {
1117         int status = 0, size_change;
1118         int inode_locked = 0;
1119         struct inode *inode = d_inode(dentry);
1120         struct super_block *sb = inode->i_sb;
1121         struct ocfs2_super *osb = OCFS2_SB(sb);
1122         struct buffer_head *bh = NULL;
1123         handle_t *handle = NULL;
1124         struct dquot *transfer_to[MAXQUOTAS] = { };
1125         int qtype;
1126         int had_lock;
1127         struct ocfs2_lock_holder oh;
1128
1129         trace_ocfs2_setattr(inode, dentry,
1130                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
1131                             dentry->d_name.len, dentry->d_name.name,
1132                             attr->ia_valid,
1133                                 attr->ia_valid & ATTR_MODE ? attr->ia_mode : 0,
1134                                 attr->ia_valid & ATTR_UID ?
1135                                         from_kuid(&init_user_ns, attr->ia_uid) : 0,
1136                                 attr->ia_valid & ATTR_GID ?
1137                                         from_kgid(&init_user_ns, attr->ia_gid) : 0);
1138
1139         /* ensuring we don't even attempt to truncate a symlink */
1140         if (S_ISLNK(inode->i_mode))
1141                 attr->ia_valid &= ~ATTR_SIZE;
1142
1143 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1144                            | ATTR_GID | ATTR_UID | ATTR_MODE)
1145         if (!(attr->ia_valid & OCFS2_VALID_ATTRS))
1146                 return 0;
1147
1148         status = setattr_prepare(&nop_mnt_idmap, dentry, attr);
1149         if (status)
1150                 return status;
1151
1152         if (is_quota_modification(&nop_mnt_idmap, inode, attr)) {
1153                 status = dquot_initialize(inode);
1154                 if (status)
1155                         return status;
1156         }
1157         size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1158         if (size_change) {
1159                 /*
1160                  * Here we should wait dio to finish before inode lock
1161                  * to avoid a deadlock between ocfs2_setattr() and
1162                  * ocfs2_dio_end_io_write()
1163                  */
1164                 inode_dio_wait(inode);
1165
1166                 status = ocfs2_rw_lock(inode, 1);
1167                 if (status < 0) {
1168                         mlog_errno(status);
1169                         goto bail;
1170                 }
1171         }
1172
1173         had_lock = ocfs2_inode_lock_tracker(inode, &bh, 1, &oh);
1174         if (had_lock < 0) {
1175                 status = had_lock;
1176                 goto bail_unlock_rw;
1177         } else if (had_lock) {
1178                 /*
1179                  * As far as we know, ocfs2_setattr() could only be the first
1180                  * VFS entry point in the call chain of recursive cluster
1181                  * locking issue.
1182                  *
1183                  * For instance:
1184                  * chmod_common()
1185                  *  notify_change()
1186                  *   ocfs2_setattr()
1187                  *    posix_acl_chmod()
1188                  *     ocfs2_iop_get_acl()
1189                  *
1190                  * But, we're not 100% sure if it's always true, because the
1191                  * ordering of the VFS entry points in the call chain is out
1192                  * of our control. So, we'd better dump the stack here to
1193                  * catch the other cases of recursive locking.
1194                  */
1195                 mlog(ML_ERROR, "Another case of recursive locking:\n");
1196                 dump_stack();
1197         }
1198         inode_locked = 1;
1199
1200         if (size_change) {
1201                 status = inode_newsize_ok(inode, attr->ia_size);
1202                 if (status)
1203                         goto bail_unlock;
1204
1205                 if (i_size_read(inode) >= attr->ia_size) {
1206                         if (ocfs2_should_order_data(inode)) {
1207                                 status = ocfs2_begin_ordered_truncate(inode,
1208                                                                       attr->ia_size);
1209                                 if (status)
1210                                         goto bail_unlock;
1211                         }
1212                         status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1213                 } else
1214                         status = ocfs2_extend_file(inode, bh, attr->ia_size);
1215                 if (status < 0) {
1216                         if (status != -ENOSPC)
1217                                 mlog_errno(status);
1218                         status = -ENOSPC;
1219                         goto bail_unlock;
1220                 }
1221         }
1222
1223         if ((attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
1224             (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
1225                 /*
1226                  * Gather pointers to quota structures so that allocation /
1227                  * freeing of quota structures happens here and not inside
1228                  * dquot_transfer() where we have problems with lock ordering
1229                  */
1230                 if (attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)
1231                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1232                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1233                         transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(attr->ia_uid));
1234                         if (IS_ERR(transfer_to[USRQUOTA])) {
1235                                 status = PTR_ERR(transfer_to[USRQUOTA]);
1236                                 transfer_to[USRQUOTA] = NULL;
1237                                 goto bail_unlock;
1238                         }
1239                 }
1240                 if (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid)
1241                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1242                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1243                         transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(attr->ia_gid));
1244                         if (IS_ERR(transfer_to[GRPQUOTA])) {
1245                                 status = PTR_ERR(transfer_to[GRPQUOTA]);
1246                                 transfer_to[GRPQUOTA] = NULL;
1247                                 goto bail_unlock;
1248                         }
1249                 }
1250                 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1251                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1252                                            2 * ocfs2_quota_trans_credits(sb));
1253                 if (IS_ERR(handle)) {
1254                         status = PTR_ERR(handle);
1255                         mlog_errno(status);
1256                         goto bail_unlock_alloc;
1257                 }
1258                 status = __dquot_transfer(inode, transfer_to);
1259                 if (status < 0)
1260                         goto bail_commit;
1261         } else {
1262                 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1263                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1264                 if (IS_ERR(handle)) {
1265                         status = PTR_ERR(handle);
1266                         mlog_errno(status);
1267                         goto bail_unlock_alloc;
1268                 }
1269         }
1270
1271         setattr_copy(&nop_mnt_idmap, inode, attr);
1272         mark_inode_dirty(inode);
1273
1274         status = ocfs2_mark_inode_dirty(handle, inode, bh);
1275         if (status < 0)
1276                 mlog_errno(status);
1277
1278 bail_commit:
1279         ocfs2_commit_trans(osb, handle);
1280 bail_unlock_alloc:
1281         up_write(&OCFS2_I(inode)->ip_alloc_sem);
1282 bail_unlock:
1283         if (status && inode_locked) {
1284                 ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
1285                 inode_locked = 0;
1286         }
1287 bail_unlock_rw:
1288         if (size_change)
1289                 ocfs2_rw_unlock(inode, 1);
1290 bail:
1291
1292         /* Release quota pointers in case we acquired them */
1293         for (qtype = 0; qtype < OCFS2_MAXQUOTAS; qtype++)
1294                 dqput(transfer_to[qtype]);
1295
1296         if (!status && attr->ia_valid & ATTR_MODE) {
1297                 status = ocfs2_acl_chmod(inode, bh);
1298                 if (status < 0)
1299                         mlog_errno(status);
1300         }
1301         if (inode_locked)
1302                 ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
1303
1304         brelse(bh);
1305         return status;
1306 }
1307
1308 int ocfs2_getattr(struct mnt_idmap *idmap, const struct path *path,
1309                   struct kstat *stat, u32 request_mask, unsigned int flags)
1310 {
1311         struct inode *inode = d_inode(path->dentry);
1312         struct super_block *sb = path->dentry->d_sb;
1313         struct ocfs2_super *osb = sb->s_fs_info;
1314         int err;
1315
1316         err = ocfs2_inode_revalidate(path->dentry);
1317         if (err) {
1318                 if (err != -ENOENT)
1319                         mlog_errno(err);
1320                 goto bail;
1321         }
1322
1323         generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
1324         /*
1325          * If there is inline data in the inode, the inode will normally not
1326          * have data blocks allocated (it may have an external xattr block).
1327          * Report at least one sector for such files, so tools like tar, rsync,
1328          * others don't incorrectly think the file is completely sparse.
1329          */
1330         if (unlikely(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1331                 stat->blocks += (stat->size + 511)>>9;
1332
1333         /* We set the blksize from the cluster size for performance */
1334         stat->blksize = osb->s_clustersize;
1335
1336 bail:
1337         return err;
1338 }
1339
1340 int ocfs2_permission(struct mnt_idmap *idmap, struct inode *inode,
1341                      int mask)
1342 {
1343         int ret, had_lock;
1344         struct ocfs2_lock_holder oh;
1345
1346         if (mask & MAY_NOT_BLOCK)
1347                 return -ECHILD;
1348
1349         had_lock = ocfs2_inode_lock_tracker(inode, NULL, 0, &oh);
1350         if (had_lock < 0) {
1351                 ret = had_lock;
1352                 goto out;
1353         } else if (had_lock) {
1354                 /* See comments in ocfs2_setattr() for details.
1355                  * The call chain of this case could be:
1356                  * do_sys_open()
1357                  *  may_open()
1358                  *   inode_permission()
1359                  *    ocfs2_permission()
1360                  *     ocfs2_iop_get_acl()
1361                  */
1362                 mlog(ML_ERROR, "Another case of recursive locking:\n");
1363                 dump_stack();
1364         }
1365
1366         ret = generic_permission(&nop_mnt_idmap, inode, mask);
1367
1368         ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock);
1369 out:
1370         return ret;
1371 }
1372
1373 static int __ocfs2_write_remove_suid(struct inode *inode,
1374                                      struct buffer_head *bh)
1375 {
1376         int ret;
1377         handle_t *handle;
1378         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1379         struct ocfs2_dinode *di;
1380
1381         trace_ocfs2_write_remove_suid(
1382                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1383                         inode->i_mode);
1384
1385         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1386         if (IS_ERR(handle)) {
1387                 ret = PTR_ERR(handle);
1388                 mlog_errno(ret);
1389                 goto out;
1390         }
1391
1392         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1393                                       OCFS2_JOURNAL_ACCESS_WRITE);
1394         if (ret < 0) {
1395                 mlog_errno(ret);
1396                 goto out_trans;
1397         }
1398
1399         inode->i_mode &= ~S_ISUID;
1400         if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1401                 inode->i_mode &= ~S_ISGID;
1402
1403         di = (struct ocfs2_dinode *) bh->b_data;
1404         di->i_mode = cpu_to_le16(inode->i_mode);
1405         ocfs2_update_inode_fsync_trans(handle, inode, 0);
1406
1407         ocfs2_journal_dirty(handle, bh);
1408
1409 out_trans:
1410         ocfs2_commit_trans(osb, handle);
1411 out:
1412         return ret;
1413 }
1414
1415 static int ocfs2_write_remove_suid(struct inode *inode)
1416 {
1417         int ret;
1418         struct buffer_head *bh = NULL;
1419
1420         ret = ocfs2_read_inode_block(inode, &bh);
1421         if (ret < 0) {
1422                 mlog_errno(ret);
1423                 goto out;
1424         }
1425
1426         ret =  __ocfs2_write_remove_suid(inode, bh);
1427 out:
1428         brelse(bh);
1429         return ret;
1430 }
1431
1432 /*
1433  * Allocate enough extents to cover the region starting at byte offset
1434  * start for len bytes. Existing extents are skipped, any extents
1435  * added are marked as "unwritten".
1436  */
1437 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1438                                             u64 start, u64 len)
1439 {
1440         int ret;
1441         u32 cpos, phys_cpos, clusters, alloc_size;
1442         u64 end = start + len;
1443         struct buffer_head *di_bh = NULL;
1444
1445         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1446                 ret = ocfs2_read_inode_block(inode, &di_bh);
1447                 if (ret) {
1448                         mlog_errno(ret);
1449                         goto out;
1450                 }
1451
1452                 /*
1453                  * Nothing to do if the requested reservation range
1454                  * fits within the inode.
1455                  */
1456                 if (ocfs2_size_fits_inline_data(di_bh, end))
1457                         goto out;
1458
1459                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1460                 if (ret) {
1461                         mlog_errno(ret);
1462                         goto out;
1463                 }
1464         }
1465
1466         /*
1467          * We consider both start and len to be inclusive.
1468          */
1469         cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1470         clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1471         clusters -= cpos;
1472
1473         while (clusters) {
1474                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1475                                          &alloc_size, NULL);
1476                 if (ret) {
1477                         mlog_errno(ret);
1478                         goto out;
1479                 }
1480
1481                 /*
1482                  * Hole or existing extent len can be arbitrary, so
1483                  * cap it to our own allocation request.
1484                  */
1485                 if (alloc_size > clusters)
1486                         alloc_size = clusters;
1487
1488                 if (phys_cpos) {
1489                         /*
1490                          * We already have an allocation at this
1491                          * region so we can safely skip it.
1492                          */
1493                         goto next;
1494                 }
1495
1496                 ret = ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1497                 if (ret) {
1498                         if (ret != -ENOSPC)
1499                                 mlog_errno(ret);
1500                         goto out;
1501                 }
1502
1503 next:
1504                 cpos += alloc_size;
1505                 clusters -= alloc_size;
1506         }
1507
1508         ret = 0;
1509 out:
1510
1511         brelse(di_bh);
1512         return ret;
1513 }
1514
1515 /*
1516  * Truncate a byte range, avoiding pages within partial clusters. This
1517  * preserves those pages for the zeroing code to write to.
1518  */
1519 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1520                                          u64 byte_len)
1521 {
1522         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1523         loff_t start, end;
1524         struct address_space *mapping = inode->i_mapping;
1525
1526         start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1527         end = byte_start + byte_len;
1528         end = end & ~(osb->s_clustersize - 1);
1529
1530         if (start < end) {
1531                 unmap_mapping_range(mapping, start, end - start, 0);
1532                 truncate_inode_pages_range(mapping, start, end - 1);
1533         }
1534 }
1535
1536 /*
1537  * zero out partial blocks of one cluster.
1538  *
1539  * start: file offset where zero starts, will be made upper block aligned.
1540  * len: it will be trimmed to the end of current cluster if "start + len"
1541  *      is bigger than it.
1542  */
1543 static int ocfs2_zeroout_partial_cluster(struct inode *inode,
1544                                         u64 start, u64 len)
1545 {
1546         int ret;
1547         u64 start_block, end_block, nr_blocks;
1548         u64 p_block, offset;
1549         u32 cluster, p_cluster, nr_clusters;
1550         struct super_block *sb = inode->i_sb;
1551         u64 end = ocfs2_align_bytes_to_clusters(sb, start);
1552
1553         if (start + len < end)
1554                 end = start + len;
1555
1556         start_block = ocfs2_blocks_for_bytes(sb, start);
1557         end_block = ocfs2_blocks_for_bytes(sb, end);
1558         nr_blocks = end_block - start_block;
1559         if (!nr_blocks)
1560                 return 0;
1561
1562         cluster = ocfs2_bytes_to_clusters(sb, start);
1563         ret = ocfs2_get_clusters(inode, cluster, &p_cluster,
1564                                 &nr_clusters, NULL);
1565         if (ret)
1566                 return ret;
1567         if (!p_cluster)
1568                 return 0;
1569
1570         offset = start_block - ocfs2_clusters_to_blocks(sb, cluster);
1571         p_block = ocfs2_clusters_to_blocks(sb, p_cluster) + offset;
1572         return sb_issue_zeroout(sb, p_block, nr_blocks, GFP_NOFS);
1573 }
1574
1575 static int ocfs2_zero_partial_clusters(struct inode *inode,
1576                                        u64 start, u64 len)
1577 {
1578         int ret = 0;
1579         u64 tmpend = 0;
1580         u64 end = start + len;
1581         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1582         unsigned int csize = osb->s_clustersize;
1583         handle_t *handle;
1584         loff_t isize = i_size_read(inode);
1585
1586         /*
1587          * The "start" and "end" values are NOT necessarily part of
1588          * the range whose allocation is being deleted. Rather, this
1589          * is what the user passed in with the request. We must zero
1590          * partial clusters here. There's no need to worry about
1591          * physical allocation - the zeroing code knows to skip holes.
1592          */
1593         trace_ocfs2_zero_partial_clusters(
1594                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1595                 (unsigned long long)start, (unsigned long long)end);
1596
1597         /*
1598          * If both edges are on a cluster boundary then there's no
1599          * zeroing required as the region is part of the allocation to
1600          * be truncated.
1601          */
1602         if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1603                 goto out;
1604
1605         /* No page cache for EOF blocks, issue zero out to disk. */
1606         if (end > isize) {
1607                 /*
1608                  * zeroout eof blocks in last cluster starting from
1609                  * "isize" even "start" > "isize" because it is
1610                  * complicated to zeroout just at "start" as "start"
1611                  * may be not aligned with block size, buffer write
1612                  * would be required to do that, but out of eof buffer
1613                  * write is not supported.
1614                  */
1615                 ret = ocfs2_zeroout_partial_cluster(inode, isize,
1616                                         end - isize);
1617                 if (ret) {
1618                         mlog_errno(ret);
1619                         goto out;
1620                 }
1621                 if (start >= isize)
1622                         goto out;
1623                 end = isize;
1624         }
1625         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1626         if (IS_ERR(handle)) {
1627                 ret = PTR_ERR(handle);
1628                 mlog_errno(ret);
1629                 goto out;
1630         }
1631
1632         /*
1633          * If start is on a cluster boundary and end is somewhere in another
1634          * cluster, we have not COWed the cluster starting at start, unless
1635          * end is also within the same cluster. So, in this case, we skip this
1636          * first call to ocfs2_zero_range_for_truncate() truncate and move on
1637          * to the next one.
1638          */
1639         if ((start & (csize - 1)) != 0) {
1640                 /*
1641                  * We want to get the byte offset of the end of the 1st
1642                  * cluster.
1643                  */
1644                 tmpend = (u64)osb->s_clustersize +
1645                         (start & ~(osb->s_clustersize - 1));
1646                 if (tmpend > end)
1647                         tmpend = end;
1648
1649                 trace_ocfs2_zero_partial_clusters_range1(
1650                         (unsigned long long)start,
1651                         (unsigned long long)tmpend);
1652
1653                 ret = ocfs2_zero_range_for_truncate(inode, handle, start,
1654                                                     tmpend);
1655                 if (ret)
1656                         mlog_errno(ret);
1657         }
1658
1659         if (tmpend < end) {
1660                 /*
1661                  * This may make start and end equal, but the zeroing
1662                  * code will skip any work in that case so there's no
1663                  * need to catch it up here.
1664                  */
1665                 start = end & ~(osb->s_clustersize - 1);
1666
1667                 trace_ocfs2_zero_partial_clusters_range2(
1668                         (unsigned long long)start, (unsigned long long)end);
1669
1670                 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1671                 if (ret)
1672                         mlog_errno(ret);
1673         }
1674         ocfs2_update_inode_fsync_trans(handle, inode, 1);
1675
1676         ocfs2_commit_trans(osb, handle);
1677 out:
1678         return ret;
1679 }
1680
1681 static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1682 {
1683         int i;
1684         struct ocfs2_extent_rec *rec = NULL;
1685
1686         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1687
1688                 rec = &el->l_recs[i];
1689
1690                 if (le32_to_cpu(rec->e_cpos) < pos)
1691                         break;
1692         }
1693
1694         return i;
1695 }
1696
1697 /*
1698  * Helper to calculate the punching pos and length in one run, we handle the
1699  * following three cases in order:
1700  *
1701  * - remove the entire record
1702  * - remove a partial record
1703  * - no record needs to be removed (hole-punching completed)
1704 */
1705 static void ocfs2_calc_trunc_pos(struct inode *inode,
1706                                  struct ocfs2_extent_list *el,
1707                                  struct ocfs2_extent_rec *rec,
1708                                  u32 trunc_start, u32 *trunc_cpos,
1709                                  u32 *trunc_len, u32 *trunc_end,
1710                                  u64 *blkno, int *done)
1711 {
1712         int ret = 0;
1713         u32 coff, range;
1714
1715         range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1716
1717         if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1718                 /*
1719                  * remove an entire extent record.
1720                  */
1721                 *trunc_cpos = le32_to_cpu(rec->e_cpos);
1722                 /*
1723                  * Skip holes if any.
1724                  */
1725                 if (range < *trunc_end)
1726                         *trunc_end = range;
1727                 *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1728                 *blkno = le64_to_cpu(rec->e_blkno);
1729                 *trunc_end = le32_to_cpu(rec->e_cpos);
1730         } else if (range > trunc_start) {
1731                 /*
1732                  * remove a partial extent record, which means we're
1733                  * removing the last extent record.
1734                  */
1735                 *trunc_cpos = trunc_start;
1736                 /*
1737                  * skip hole if any.
1738                  */
1739                 if (range < *trunc_end)
1740                         *trunc_end = range;
1741                 *trunc_len = *trunc_end - trunc_start;
1742                 coff = trunc_start - le32_to_cpu(rec->e_cpos);
1743                 *blkno = le64_to_cpu(rec->e_blkno) +
1744                                 ocfs2_clusters_to_blocks(inode->i_sb, coff);
1745                 *trunc_end = trunc_start;
1746         } else {
1747                 /*
1748                  * It may have two following possibilities:
1749                  *
1750                  * - last record has been removed
1751                  * - trunc_start was within a hole
1752                  *
1753                  * both two cases mean the completion of hole punching.
1754                  */
1755                 ret = 1;
1756         }
1757
1758         *done = ret;
1759 }
1760
1761 int ocfs2_remove_inode_range(struct inode *inode,
1762                              struct buffer_head *di_bh, u64 byte_start,
1763                              u64 byte_len)
1764 {
1765         int ret = 0, flags = 0, done = 0, i;
1766         u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1767         u32 cluster_in_el;
1768         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1769         struct ocfs2_cached_dealloc_ctxt dealloc;
1770         struct address_space *mapping = inode->i_mapping;
1771         struct ocfs2_extent_tree et;
1772         struct ocfs2_path *path = NULL;
1773         struct ocfs2_extent_list *el = NULL;
1774         struct ocfs2_extent_rec *rec = NULL;
1775         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1776         u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1777
1778         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1779         ocfs2_init_dealloc_ctxt(&dealloc);
1780
1781         trace_ocfs2_remove_inode_range(
1782                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1783                         (unsigned long long)byte_start,
1784                         (unsigned long long)byte_len);
1785
1786         if (byte_len == 0)
1787                 return 0;
1788
1789         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1790                 int id_count = ocfs2_max_inline_data_with_xattr(inode->i_sb, di);
1791
1792                 if (byte_start > id_count || byte_start + byte_len > id_count) {
1793                         ret = -EINVAL;
1794                         mlog_errno(ret);
1795                         goto out;
1796                 }
1797
1798                 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1799                                             byte_start + byte_len, 0);
1800                 if (ret) {
1801                         mlog_errno(ret);
1802                         goto out;
1803                 }
1804                 /*
1805                  * There's no need to get fancy with the page cache
1806                  * truncate of an inline-data inode. We're talking
1807                  * about less than a page here, which will be cached
1808                  * in the dinode buffer anyway.
1809                  */
1810                 unmap_mapping_range(mapping, 0, 0, 0);
1811                 truncate_inode_pages(mapping, 0);
1812                 goto out;
1813         }
1814
1815         /*
1816          * For reflinks, we may need to CoW 2 clusters which might be
1817          * partially zero'd later, if hole's start and end offset were
1818          * within one cluster(means is not exactly aligned to clustersize).
1819          */
1820
1821         if (ocfs2_is_refcount_inode(inode)) {
1822                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1823                 if (ret) {
1824                         mlog_errno(ret);
1825                         goto out;
1826                 }
1827
1828                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1829                 if (ret) {
1830                         mlog_errno(ret);
1831                         goto out;
1832                 }
1833         }
1834
1835         trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1836         trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1837         cluster_in_el = trunc_end;
1838
1839         ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1840         if (ret) {
1841                 mlog_errno(ret);
1842                 goto out;
1843         }
1844
1845         path = ocfs2_new_path_from_et(&et);
1846         if (!path) {
1847                 ret = -ENOMEM;
1848                 mlog_errno(ret);
1849                 goto out;
1850         }
1851
1852         while (trunc_end > trunc_start) {
1853
1854                 ret = ocfs2_find_path(INODE_CACHE(inode), path,
1855                                       cluster_in_el);
1856                 if (ret) {
1857                         mlog_errno(ret);
1858                         goto out;
1859                 }
1860
1861                 el = path_leaf_el(path);
1862
1863                 i = ocfs2_find_rec(el, trunc_end);
1864                 /*
1865                  * Need to go to previous extent block.
1866                  */
1867                 if (i < 0) {
1868                         if (path->p_tree_depth == 0)
1869                                 break;
1870
1871                         ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1872                                                             path,
1873                                                             &cluster_in_el);
1874                         if (ret) {
1875                                 mlog_errno(ret);
1876                                 goto out;
1877                         }
1878
1879                         /*
1880                          * We've reached the leftmost extent block,
1881                          * it's safe to leave.
1882                          */
1883                         if (cluster_in_el == 0)
1884                                 break;
1885
1886                         /*
1887                          * The 'pos' searched for previous extent block is
1888                          * always one cluster less than actual trunc_end.
1889                          */
1890                         trunc_end = cluster_in_el + 1;
1891
1892                         ocfs2_reinit_path(path, 1);
1893
1894                         continue;
1895
1896                 } else
1897                         rec = &el->l_recs[i];
1898
1899                 ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1900                                      &trunc_len, &trunc_end, &blkno, &done);
1901                 if (done)
1902                         break;
1903
1904                 flags = rec->e_flags;
1905                 phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1906
1907                 ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1908                                                phys_cpos, trunc_len, flags,
1909                                                &dealloc, refcount_loc, false);
1910                 if (ret < 0) {
1911                         mlog_errno(ret);
1912                         goto out;
1913                 }
1914
1915                 cluster_in_el = trunc_end;
1916
1917                 ocfs2_reinit_path(path, 1);
1918         }
1919
1920         ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1921
1922 out:
1923         ocfs2_free_path(path);
1924         ocfs2_schedule_truncate_log_flush(osb, 1);
1925         ocfs2_run_deallocs(osb, &dealloc);
1926
1927         return ret;
1928 }
1929
1930 /*
1931  * Parts of this function taken from xfs_change_file_space()
1932  */
1933 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1934                                      loff_t f_pos, unsigned int cmd,
1935                                      struct ocfs2_space_resv *sr,
1936                                      int change_size)
1937 {
1938         int ret;
1939         s64 llen;
1940         loff_t size, orig_isize;
1941         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1942         struct buffer_head *di_bh = NULL;
1943         handle_t *handle;
1944         unsigned long long max_off = inode->i_sb->s_maxbytes;
1945
1946         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1947                 return -EROFS;
1948
1949         inode_lock(inode);
1950
1951         /* Wait all existing dio workers, newcomers will block on i_rwsem */
1952         inode_dio_wait(inode);
1953         /*
1954          * This prevents concurrent writes on other nodes
1955          */
1956         ret = ocfs2_rw_lock(inode, 1);
1957         if (ret) {
1958                 mlog_errno(ret);
1959                 goto out;
1960         }
1961
1962         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1963         if (ret) {
1964                 mlog_errno(ret);
1965                 goto out_rw_unlock;
1966         }
1967
1968         if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1969                 ret = -EPERM;
1970                 goto out_inode_unlock;
1971         }
1972
1973         switch (sr->l_whence) {
1974         case 0: /*SEEK_SET*/
1975                 break;
1976         case 1: /*SEEK_CUR*/
1977                 sr->l_start += f_pos;
1978                 break;
1979         case 2: /*SEEK_END*/
1980                 sr->l_start += i_size_read(inode);
1981                 break;
1982         default:
1983                 ret = -EINVAL;
1984                 goto out_inode_unlock;
1985         }
1986         sr->l_whence = 0;
1987
1988         llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1989
1990         if (sr->l_start < 0
1991             || sr->l_start > max_off
1992             || (sr->l_start + llen) < 0
1993             || (sr->l_start + llen) > max_off) {
1994                 ret = -EINVAL;
1995                 goto out_inode_unlock;
1996         }
1997         size = sr->l_start + sr->l_len;
1998
1999         if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64 ||
2000             cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) {
2001                 if (sr->l_len <= 0) {
2002                         ret = -EINVAL;
2003                         goto out_inode_unlock;
2004                 }
2005         }
2006
2007         if (file && setattr_should_drop_suidgid(&nop_mnt_idmap, file_inode(file))) {
2008                 ret = __ocfs2_write_remove_suid(inode, di_bh);
2009                 if (ret) {
2010                         mlog_errno(ret);
2011                         goto out_inode_unlock;
2012                 }
2013         }
2014
2015         down_write(&OCFS2_I(inode)->ip_alloc_sem);
2016         switch (cmd) {
2017         case OCFS2_IOC_RESVSP:
2018         case OCFS2_IOC_RESVSP64:
2019                 /*
2020                  * This takes unsigned offsets, but the signed ones we
2021                  * pass have been checked against overflow above.
2022                  */
2023                 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
2024                                                        sr->l_len);
2025                 break;
2026         case OCFS2_IOC_UNRESVSP:
2027         case OCFS2_IOC_UNRESVSP64:
2028                 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
2029                                                sr->l_len);
2030                 break;
2031         default:
2032                 ret = -EINVAL;
2033         }
2034
2035         orig_isize = i_size_read(inode);
2036         /* zeroout eof blocks in the cluster. */
2037         if (!ret && change_size && orig_isize < size) {
2038                 ret = ocfs2_zeroout_partial_cluster(inode, orig_isize,
2039                                         size - orig_isize);
2040                 if (!ret)
2041                         i_size_write(inode, size);
2042         }
2043         up_write(&OCFS2_I(inode)->ip_alloc_sem);
2044         if (ret) {
2045                 mlog_errno(ret);
2046                 goto out_inode_unlock;
2047         }
2048
2049         /*
2050          * We update c/mtime for these changes
2051          */
2052         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
2053         if (IS_ERR(handle)) {
2054                 ret = PTR_ERR(handle);
2055                 mlog_errno(ret);
2056                 goto out_inode_unlock;
2057         }
2058
2059         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
2060         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
2061         if (ret < 0)
2062                 mlog_errno(ret);
2063
2064         if (file && (file->f_flags & O_SYNC))
2065                 handle->h_sync = 1;
2066
2067         ocfs2_commit_trans(osb, handle);
2068
2069 out_inode_unlock:
2070         brelse(di_bh);
2071         ocfs2_inode_unlock(inode, 1);
2072 out_rw_unlock:
2073         ocfs2_rw_unlock(inode, 1);
2074
2075 out:
2076         inode_unlock(inode);
2077         return ret;
2078 }
2079
2080 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
2081                             struct ocfs2_space_resv *sr)
2082 {
2083         struct inode *inode = file_inode(file);
2084         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2085         int ret;
2086
2087         if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
2088             !ocfs2_writes_unwritten_extents(osb))
2089                 return -ENOTTY;
2090         else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
2091                  !ocfs2_sparse_alloc(osb))
2092                 return -ENOTTY;
2093
2094         if (!S_ISREG(inode->i_mode))
2095                 return -EINVAL;
2096
2097         if (!(file->f_mode & FMODE_WRITE))
2098                 return -EBADF;
2099
2100         ret = mnt_want_write_file(file);
2101         if (ret)
2102                 return ret;
2103         ret = __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
2104         mnt_drop_write_file(file);
2105         return ret;
2106 }
2107
2108 static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
2109                             loff_t len)
2110 {
2111         struct inode *inode = file_inode(file);
2112         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2113         struct ocfs2_space_resv sr;
2114         int change_size = 1;
2115         int cmd = OCFS2_IOC_RESVSP64;
2116         int ret = 0;
2117
2118         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2119                 return -EOPNOTSUPP;
2120         if (!ocfs2_writes_unwritten_extents(osb))
2121                 return -EOPNOTSUPP;
2122
2123         if (mode & FALLOC_FL_KEEP_SIZE) {
2124                 change_size = 0;
2125         } else {
2126                 ret = inode_newsize_ok(inode, offset + len);
2127                 if (ret)
2128                         return ret;
2129         }
2130
2131         if (mode & FALLOC_FL_PUNCH_HOLE)
2132                 cmd = OCFS2_IOC_UNRESVSP64;
2133
2134         sr.l_whence = 0;
2135         sr.l_start = (s64)offset;
2136         sr.l_len = (s64)len;
2137
2138         return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
2139                                          change_size);
2140 }
2141
2142 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2143                                    size_t count)
2144 {
2145         int ret = 0;
2146         unsigned int extent_flags;
2147         u32 cpos, clusters, extent_len, phys_cpos;
2148         struct super_block *sb = inode->i_sb;
2149
2150         if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2151             !ocfs2_is_refcount_inode(inode) ||
2152             OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2153                 return 0;
2154
2155         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2156         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2157
2158         while (clusters) {
2159                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2160                                          &extent_flags);
2161                 if (ret < 0) {
2162                         mlog_errno(ret);
2163                         goto out;
2164                 }
2165
2166                 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2167                         ret = 1;
2168                         break;
2169                 }
2170
2171                 if (extent_len > clusters)
2172                         extent_len = clusters;
2173
2174                 clusters -= extent_len;
2175                 cpos += extent_len;
2176         }
2177 out:
2178         return ret;
2179 }
2180
2181 static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
2182 {
2183         int blockmask = inode->i_sb->s_blocksize - 1;
2184         loff_t final_size = pos + count;
2185
2186         if ((pos & blockmask) || (final_size & blockmask))
2187                 return 1;
2188         return 0;
2189 }
2190
2191 static int ocfs2_inode_lock_for_extent_tree(struct inode *inode,
2192                                             struct buffer_head **di_bh,
2193                                             int meta_level,
2194                                             int write_sem,
2195                                             int wait)
2196 {
2197         int ret = 0;
2198
2199         if (wait)
2200                 ret = ocfs2_inode_lock(inode, di_bh, meta_level);
2201         else
2202                 ret = ocfs2_try_inode_lock(inode, di_bh, meta_level);
2203         if (ret < 0)
2204                 goto out;
2205
2206         if (wait) {
2207                 if (write_sem)
2208                         down_write(&OCFS2_I(inode)->ip_alloc_sem);
2209                 else
2210                         down_read(&OCFS2_I(inode)->ip_alloc_sem);
2211         } else {
2212                 if (write_sem)
2213                         ret = down_write_trylock(&OCFS2_I(inode)->ip_alloc_sem);
2214                 else
2215                         ret = down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem);
2216
2217                 if (!ret) {
2218                         ret = -EAGAIN;
2219                         goto out_unlock;
2220                 }
2221         }
2222
2223         return ret;
2224
2225 out_unlock:
2226         brelse(*di_bh);
2227         *di_bh = NULL;
2228         ocfs2_inode_unlock(inode, meta_level);
2229 out:
2230         return ret;
2231 }
2232
2233 static void ocfs2_inode_unlock_for_extent_tree(struct inode *inode,
2234                                                struct buffer_head **di_bh,
2235                                                int meta_level,
2236                                                int write_sem)
2237 {
2238         if (write_sem)
2239                 up_write(&OCFS2_I(inode)->ip_alloc_sem);
2240         else
2241                 up_read(&OCFS2_I(inode)->ip_alloc_sem);
2242
2243         brelse(*di_bh);
2244         *di_bh = NULL;
2245
2246         if (meta_level >= 0)
2247                 ocfs2_inode_unlock(inode, meta_level);
2248 }
2249
2250 static int ocfs2_prepare_inode_for_write(struct file *file,
2251                                          loff_t pos, size_t count, int wait)
2252 {
2253         int ret = 0, meta_level = 0, overwrite_io = 0;
2254         int write_sem = 0;
2255         struct dentry *dentry = file->f_path.dentry;
2256         struct inode *inode = d_inode(dentry);
2257         struct buffer_head *di_bh = NULL;
2258         u32 cpos;
2259         u32 clusters;
2260
2261         /*
2262          * We start with a read level meta lock and only jump to an ex
2263          * if we need to make modifications here.
2264          */
2265         for(;;) {
2266                 ret = ocfs2_inode_lock_for_extent_tree(inode,
2267                                                        &di_bh,
2268                                                        meta_level,
2269                                                        write_sem,
2270                                                        wait);
2271                 if (ret < 0) {
2272                         if (ret != -EAGAIN)
2273                                 mlog_errno(ret);
2274                         goto out;
2275                 }
2276
2277                 /*
2278                  * Check if IO will overwrite allocated blocks in case
2279                  * IOCB_NOWAIT flag is set.
2280                  */
2281                 if (!wait && !overwrite_io) {
2282                         overwrite_io = 1;
2283
2284                         ret = ocfs2_overwrite_io(inode, di_bh, pos, count);
2285                         if (ret < 0) {
2286                                 if (ret != -EAGAIN)
2287                                         mlog_errno(ret);
2288                                 goto out_unlock;
2289                         }
2290                 }
2291
2292                 /* Clear suid / sgid if necessary. We do this here
2293                  * instead of later in the write path because
2294                  * remove_suid() calls ->setattr without any hint that
2295                  * we may have already done our cluster locking. Since
2296                  * ocfs2_setattr() *must* take cluster locks to
2297                  * proceed, this will lead us to recursively lock the
2298                  * inode. There's also the dinode i_size state which
2299                  * can be lost via setattr during extending writes (we
2300                  * set inode->i_size at the end of a write. */
2301                 if (setattr_should_drop_suidgid(&nop_mnt_idmap, inode)) {
2302                         if (meta_level == 0) {
2303                                 ocfs2_inode_unlock_for_extent_tree(inode,
2304                                                                    &di_bh,
2305                                                                    meta_level,
2306                                                                    write_sem);
2307                                 meta_level = 1;
2308                                 continue;
2309                         }
2310
2311                         ret = ocfs2_write_remove_suid(inode);
2312                         if (ret < 0) {
2313                                 mlog_errno(ret);
2314                                 goto out_unlock;
2315                         }
2316                 }
2317
2318                 ret = ocfs2_check_range_for_refcount(inode, pos, count);
2319                 if (ret == 1) {
2320                         ocfs2_inode_unlock_for_extent_tree(inode,
2321                                                            &di_bh,
2322                                                            meta_level,
2323                                                            write_sem);
2324                         meta_level = 1;
2325                         write_sem = 1;
2326                         ret = ocfs2_inode_lock_for_extent_tree(inode,
2327                                                                &di_bh,
2328                                                                meta_level,
2329                                                                write_sem,
2330                                                                wait);
2331                         if (ret < 0) {
2332                                 if (ret != -EAGAIN)
2333                                         mlog_errno(ret);
2334                                 goto out;
2335                         }
2336
2337                         cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2338                         clusters =
2339                                 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2340                         ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
2341                 }
2342
2343                 if (ret < 0) {
2344                         if (ret != -EAGAIN)
2345                                 mlog_errno(ret);
2346                         goto out_unlock;
2347                 }
2348
2349                 break;
2350         }
2351
2352 out_unlock:
2353         trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
2354                                             pos, count, wait);
2355
2356         ocfs2_inode_unlock_for_extent_tree(inode,
2357                                            &di_bh,
2358                                            meta_level,
2359                                            write_sem);
2360
2361 out:
2362         return ret;
2363 }
2364
2365 static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
2366                                     struct iov_iter *from)
2367 {
2368         int rw_level;
2369         ssize_t written = 0;
2370         ssize_t ret;
2371         size_t count = iov_iter_count(from);
2372         struct file *file = iocb->ki_filp;
2373         struct inode *inode = file_inode(file);
2374         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2375         int full_coherency = !(osb->s_mount_opt &
2376                                OCFS2_MOUNT_COHERENCY_BUFFERED);
2377         void *saved_ki_complete = NULL;
2378         int append_write = ((iocb->ki_pos + count) >=
2379                         i_size_read(inode) ? 1 : 0);
2380         int direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
2381         int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
2382
2383         trace_ocfs2_file_write_iter(inode, file, file->f_path.dentry,
2384                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
2385                 file->f_path.dentry->d_name.len,
2386                 file->f_path.dentry->d_name.name,
2387                 (unsigned int)from->nr_segs);   /* GRRRRR */
2388
2389         if (!direct_io && nowait)
2390                 return -EOPNOTSUPP;
2391
2392         if (count == 0)
2393                 return 0;
2394
2395         if (nowait) {
2396                 if (!inode_trylock(inode))
2397                         return -EAGAIN;
2398         } else
2399                 inode_lock(inode);
2400
2401         ocfs2_iocb_init_rw_locked(iocb);
2402
2403         /*
2404          * Concurrent O_DIRECT writes are allowed with
2405          * mount_option "coherency=buffered".
2406          * For append write, we must take rw EX.
2407          */
2408         rw_level = (!direct_io || full_coherency || append_write);
2409
2410         if (nowait)
2411                 ret = ocfs2_try_rw_lock(inode, rw_level);
2412         else
2413                 ret = ocfs2_rw_lock(inode, rw_level);
2414         if (ret < 0) {
2415                 if (ret != -EAGAIN)
2416                         mlog_errno(ret);
2417                 goto out_mutex;
2418         }
2419
2420         /*
2421          * O_DIRECT writes with "coherency=full" need to take EX cluster
2422          * inode_lock to guarantee coherency.
2423          */
2424         if (direct_io && full_coherency) {
2425                 /*
2426                  * We need to take and drop the inode lock to force
2427                  * other nodes to drop their caches.  Buffered I/O
2428                  * already does this in write_begin().
2429                  */
2430                 if (nowait)
2431                         ret = ocfs2_try_inode_lock(inode, NULL, 1);
2432                 else
2433                         ret = ocfs2_inode_lock(inode, NULL, 1);
2434                 if (ret < 0) {
2435                         if (ret != -EAGAIN)
2436                                 mlog_errno(ret);
2437                         goto out;
2438                 }
2439
2440                 ocfs2_inode_unlock(inode, 1);
2441         }
2442
2443         ret = generic_write_checks(iocb, from);
2444         if (ret <= 0) {
2445                 if (ret)
2446                         mlog_errno(ret);
2447                 goto out;
2448         }
2449         count = ret;
2450
2451         ret = ocfs2_prepare_inode_for_write(file, iocb->ki_pos, count, !nowait);
2452         if (ret < 0) {
2453                 if (ret != -EAGAIN)
2454                         mlog_errno(ret);
2455                 goto out;
2456         }
2457
2458         if (direct_io && !is_sync_kiocb(iocb) &&
2459             ocfs2_is_io_unaligned(inode, count, iocb->ki_pos)) {
2460                 /*
2461                  * Make it a sync io if it's an unaligned aio.
2462                  */
2463                 saved_ki_complete = xchg(&iocb->ki_complete, NULL);
2464         }
2465
2466         /* communicate with ocfs2_dio_end_io */
2467         ocfs2_iocb_set_rw_locked(iocb, rw_level);
2468
2469         written = __generic_file_write_iter(iocb, from);
2470         /* buffered aio wouldn't have proper lock coverage today */
2471         BUG_ON(written == -EIOCBQUEUED && !direct_io);
2472
2473         /*
2474          * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2475          * function pointer which is called when o_direct io completes so that
2476          * it can unlock our rw lock.
2477          * Unfortunately there are error cases which call end_io and others
2478          * that don't.  so we don't have to unlock the rw_lock if either an
2479          * async dio is going to do it in the future or an end_io after an
2480          * error has already done it.
2481          */
2482         if ((written == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2483                 rw_level = -1;
2484         }
2485
2486         if (unlikely(written <= 0))
2487                 goto out;
2488
2489         if (((file->f_flags & O_DSYNC) && !direct_io) ||
2490             IS_SYNC(inode)) {
2491                 ret = filemap_fdatawrite_range(file->f_mapping,
2492                                                iocb->ki_pos - written,
2493                                                iocb->ki_pos - 1);
2494                 if (ret < 0)
2495                         written = ret;
2496
2497                 if (!ret) {
2498                         ret = jbd2_journal_force_commit(osb->journal->j_journal);
2499                         if (ret < 0)
2500                                 written = ret;
2501                 }
2502
2503                 if (!ret)
2504                         ret = filemap_fdatawait_range(file->f_mapping,
2505                                                       iocb->ki_pos - written,
2506                                                       iocb->ki_pos - 1);
2507         }
2508
2509 out:
2510         if (saved_ki_complete)
2511                 xchg(&iocb->ki_complete, saved_ki_complete);
2512
2513         if (rw_level != -1)
2514                 ocfs2_rw_unlock(inode, rw_level);
2515
2516 out_mutex:
2517         inode_unlock(inode);
2518
2519         if (written)
2520                 ret = written;
2521         return ret;
2522 }
2523
2524 static ssize_t ocfs2_file_read_iter(struct kiocb *iocb,
2525                                    struct iov_iter *to)
2526 {
2527         int ret = 0, rw_level = -1, lock_level = 0;
2528         struct file *filp = iocb->ki_filp;
2529         struct inode *inode = file_inode(filp);
2530         int direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
2531         int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
2532
2533         trace_ocfs2_file_read_iter(inode, filp, filp->f_path.dentry,
2534                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2535                         filp->f_path.dentry->d_name.len,
2536                         filp->f_path.dentry->d_name.name,
2537                         to->nr_segs);   /* GRRRRR */
2538
2539
2540         if (!inode) {
2541                 ret = -EINVAL;
2542                 mlog_errno(ret);
2543                 goto bail;
2544         }
2545
2546         if (!direct_io && nowait)
2547                 return -EOPNOTSUPP;
2548
2549         ocfs2_iocb_init_rw_locked(iocb);
2550
2551         /*
2552          * buffered reads protect themselves in ->read_folio().  O_DIRECT reads
2553          * need locks to protect pending reads from racing with truncate.
2554          */
2555         if (direct_io) {
2556                 if (nowait)
2557                         ret = ocfs2_try_rw_lock(inode, 0);
2558                 else
2559                         ret = ocfs2_rw_lock(inode, 0);
2560
2561                 if (ret < 0) {
2562                         if (ret != -EAGAIN)
2563                                 mlog_errno(ret);
2564                         goto bail;
2565                 }
2566                 rw_level = 0;
2567                 /* communicate with ocfs2_dio_end_io */
2568                 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2569         }
2570
2571         /*
2572          * We're fine letting folks race truncates and extending
2573          * writes with read across the cluster, just like they can
2574          * locally. Hence no rw_lock during read.
2575          *
2576          * Take and drop the meta data lock to update inode fields
2577          * like i_size. This allows the checks down below
2578          * copy_splice_read() a chance of actually working.
2579          */
2580         ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level,
2581                                      !nowait);
2582         if (ret < 0) {
2583                 if (ret != -EAGAIN)
2584                         mlog_errno(ret);
2585                 goto bail;
2586         }
2587         ocfs2_inode_unlock(inode, lock_level);
2588
2589         ret = generic_file_read_iter(iocb, to);
2590         trace_generic_file_read_iter_ret(ret);
2591
2592         /* buffered aio wouldn't have proper lock coverage today */
2593         BUG_ON(ret == -EIOCBQUEUED && !direct_io);
2594
2595         /* see ocfs2_file_write_iter */
2596         if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2597                 rw_level = -1;
2598         }
2599
2600 bail:
2601         if (rw_level != -1)
2602                 ocfs2_rw_unlock(inode, rw_level);
2603
2604         return ret;
2605 }
2606
2607 static ssize_t ocfs2_file_splice_read(struct file *in, loff_t *ppos,
2608                                       struct pipe_inode_info *pipe,
2609                                       size_t len, unsigned int flags)
2610 {
2611         struct inode *inode = file_inode(in);
2612         ssize_t ret = 0;
2613         int lock_level = 0;
2614
2615         trace_ocfs2_file_splice_read(inode, in, in->f_path.dentry,
2616                                      (unsigned long long)OCFS2_I(inode)->ip_blkno,
2617                                      in->f_path.dentry->d_name.len,
2618                                      in->f_path.dentry->d_name.name,
2619                                      flags);
2620
2621         /*
2622          * We're fine letting folks race truncates and extending writes with
2623          * read across the cluster, just like they can locally.  Hence no
2624          * rw_lock during read.
2625          *
2626          * Take and drop the meta data lock to update inode fields like i_size.
2627          * This allows the checks down below filemap_splice_read() a chance of
2628          * actually working.
2629          */
2630         ret = ocfs2_inode_lock_atime(inode, in->f_path.mnt, &lock_level, 1);
2631         if (ret < 0) {
2632                 if (ret != -EAGAIN)
2633                         mlog_errno(ret);
2634                 goto bail;
2635         }
2636         ocfs2_inode_unlock(inode, lock_level);
2637
2638         ret = filemap_splice_read(in, ppos, pipe, len, flags);
2639         trace_filemap_splice_read_ret(ret);
2640 bail:
2641         return ret;
2642 }
2643
2644 /* Refer generic_file_llseek_unlocked() */
2645 static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int whence)
2646 {
2647         struct inode *inode = file->f_mapping->host;
2648         int ret = 0;
2649
2650         inode_lock(inode);
2651
2652         switch (whence) {
2653         case SEEK_SET:
2654                 break;
2655         case SEEK_END:
2656                 /* SEEK_END requires the OCFS2 inode lock for the file
2657                  * because it references the file's size.
2658                  */
2659                 ret = ocfs2_inode_lock(inode, NULL, 0);
2660                 if (ret < 0) {
2661                         mlog_errno(ret);
2662                         goto out;
2663                 }
2664                 offset += i_size_read(inode);
2665                 ocfs2_inode_unlock(inode, 0);
2666                 break;
2667         case SEEK_CUR:
2668                 if (offset == 0) {
2669                         offset = file->f_pos;
2670                         goto out;
2671                 }
2672                 offset += file->f_pos;
2673                 break;
2674         case SEEK_DATA:
2675         case SEEK_HOLE:
2676                 ret = ocfs2_seek_data_hole_offset(file, &offset, whence);
2677                 if (ret)
2678                         goto out;
2679                 break;
2680         default:
2681                 ret = -EINVAL;
2682                 goto out;
2683         }
2684
2685         offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
2686
2687 out:
2688         inode_unlock(inode);
2689         if (ret)
2690                 return ret;
2691         return offset;
2692 }
2693
2694 static loff_t ocfs2_remap_file_range(struct file *file_in, loff_t pos_in,
2695                                      struct file *file_out, loff_t pos_out,
2696                                      loff_t len, unsigned int remap_flags)
2697 {
2698         struct inode *inode_in = file_inode(file_in);
2699         struct inode *inode_out = file_inode(file_out);
2700         struct ocfs2_super *osb = OCFS2_SB(inode_in->i_sb);
2701         struct buffer_head *in_bh = NULL, *out_bh = NULL;
2702         bool same_inode = (inode_in == inode_out);
2703         loff_t remapped = 0;
2704         ssize_t ret;
2705
2706         if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
2707                 return -EINVAL;
2708         if (!ocfs2_refcount_tree(osb))
2709                 return -EOPNOTSUPP;
2710         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
2711                 return -EROFS;
2712
2713         /* Lock both files against IO */
2714         ret = ocfs2_reflink_inodes_lock(inode_in, &in_bh, inode_out, &out_bh);
2715         if (ret)
2716                 return ret;
2717
2718         /* Check file eligibility and prepare for block sharing. */
2719         ret = -EINVAL;
2720         if ((OCFS2_I(inode_in)->ip_flags & OCFS2_INODE_SYSTEM_FILE) ||
2721             (OCFS2_I(inode_out)->ip_flags & OCFS2_INODE_SYSTEM_FILE))
2722                 goto out_unlock;
2723
2724         ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out,
2725                         &len, remap_flags);
2726         if (ret < 0 || len == 0)
2727                 goto out_unlock;
2728
2729         /* Lock out changes to the allocation maps and remap. */
2730         down_write(&OCFS2_I(inode_in)->ip_alloc_sem);
2731         if (!same_inode)
2732                 down_write_nested(&OCFS2_I(inode_out)->ip_alloc_sem,
2733                                   SINGLE_DEPTH_NESTING);
2734
2735         /* Zap any page cache for the destination file's range. */
2736         truncate_inode_pages_range(&inode_out->i_data,
2737                                    round_down(pos_out, PAGE_SIZE),
2738                                    round_up(pos_out + len, PAGE_SIZE) - 1);
2739
2740         remapped = ocfs2_reflink_remap_blocks(inode_in, in_bh, pos_in,
2741                         inode_out, out_bh, pos_out, len);
2742         up_write(&OCFS2_I(inode_in)->ip_alloc_sem);
2743         if (!same_inode)
2744                 up_write(&OCFS2_I(inode_out)->ip_alloc_sem);
2745         if (remapped < 0) {
2746                 ret = remapped;
2747                 mlog_errno(ret);
2748                 goto out_unlock;
2749         }
2750
2751         /*
2752          * Empty the extent map so that we may get the right extent
2753          * record from the disk.
2754          */
2755         ocfs2_extent_map_trunc(inode_in, 0);
2756         ocfs2_extent_map_trunc(inode_out, 0);
2757
2758         ret = ocfs2_reflink_update_dest(inode_out, out_bh, pos_out + len);
2759         if (ret) {
2760                 mlog_errno(ret);
2761                 goto out_unlock;
2762         }
2763
2764 out_unlock:
2765         ocfs2_reflink_inodes_unlock(inode_in, in_bh, inode_out, out_bh);
2766         return remapped > 0 ? remapped : ret;
2767 }
2768
2769 static loff_t ocfs2_dir_llseek(struct file *file, loff_t offset, int whence)
2770 {
2771         struct ocfs2_file_private *fp = file->private_data;
2772
2773         return generic_llseek_cookie(file, offset, whence, &fp->cookie);
2774 }
2775
2776 const struct inode_operations ocfs2_file_iops = {
2777         .setattr        = ocfs2_setattr,
2778         .getattr        = ocfs2_getattr,
2779         .permission     = ocfs2_permission,
2780         .listxattr      = ocfs2_listxattr,
2781         .fiemap         = ocfs2_fiemap,
2782         .get_inode_acl  = ocfs2_iop_get_acl,
2783         .set_acl        = ocfs2_iop_set_acl,
2784         .fileattr_get   = ocfs2_fileattr_get,
2785         .fileattr_set   = ocfs2_fileattr_set,
2786 };
2787
2788 const struct inode_operations ocfs2_special_file_iops = {
2789         .setattr        = ocfs2_setattr,
2790         .getattr        = ocfs2_getattr,
2791         .listxattr      = ocfs2_listxattr,
2792         .permission     = ocfs2_permission,
2793         .get_inode_acl  = ocfs2_iop_get_acl,
2794         .set_acl        = ocfs2_iop_set_acl,
2795 };
2796
2797 /*
2798  * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2799  * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2800  */
2801 const struct file_operations ocfs2_fops = {
2802         .llseek         = ocfs2_file_llseek,
2803         .mmap           = ocfs2_mmap,
2804         .fsync          = ocfs2_sync_file,
2805         .release        = ocfs2_file_release,
2806         .open           = ocfs2_file_open,
2807         .read_iter      = ocfs2_file_read_iter,
2808         .write_iter     = ocfs2_file_write_iter,
2809         .unlocked_ioctl = ocfs2_ioctl,
2810 #ifdef CONFIG_COMPAT
2811         .compat_ioctl   = ocfs2_compat_ioctl,
2812 #endif
2813         .lock           = ocfs2_lock,
2814         .flock          = ocfs2_flock,
2815         .splice_read    = ocfs2_file_splice_read,
2816         .splice_write   = iter_file_splice_write,
2817         .fallocate      = ocfs2_fallocate,
2818         .remap_file_range = ocfs2_remap_file_range,
2819         .fop_flags      = FOP_ASYNC_LOCK,
2820 };
2821
2822 WRAP_DIR_ITER(ocfs2_readdir) // FIXME!
2823 const struct file_operations ocfs2_dops = {
2824         .llseek         = ocfs2_dir_llseek,
2825         .read           = generic_read_dir,
2826         .iterate_shared = shared_ocfs2_readdir,
2827         .fsync          = ocfs2_sync_file,
2828         .release        = ocfs2_dir_release,
2829         .open           = ocfs2_dir_open,
2830         .unlocked_ioctl = ocfs2_ioctl,
2831 #ifdef CONFIG_COMPAT
2832         .compat_ioctl   = ocfs2_compat_ioctl,
2833 #endif
2834         .lock           = ocfs2_lock,
2835         .flock          = ocfs2_flock,
2836         .fop_flags      = FOP_ASYNC_LOCK,
2837 };
2838
2839 /*
2840  * POSIX-lockless variants of our file_operations.
2841  *
2842  * These will be used if the underlying cluster stack does not support
2843  * posix file locking, if the user passes the "localflocks" mount
2844  * option, or if we have a local-only fs.
2845  *
2846  * ocfs2_flock is in here because all stacks handle UNIX file locks,
2847  * so we still want it in the case of no stack support for
2848  * plocks. Internally, it will do the right thing when asked to ignore
2849  * the cluster.
2850  */
2851 const struct file_operations ocfs2_fops_no_plocks = {
2852         .llseek         = ocfs2_file_llseek,
2853         .mmap           = ocfs2_mmap,
2854         .fsync          = ocfs2_sync_file,
2855         .release        = ocfs2_file_release,
2856         .open           = ocfs2_file_open,
2857         .read_iter      = ocfs2_file_read_iter,
2858         .write_iter     = ocfs2_file_write_iter,
2859         .unlocked_ioctl = ocfs2_ioctl,
2860 #ifdef CONFIG_COMPAT
2861         .compat_ioctl   = ocfs2_compat_ioctl,
2862 #endif
2863         .flock          = ocfs2_flock,
2864         .splice_read    = filemap_splice_read,
2865         .splice_write   = iter_file_splice_write,
2866         .fallocate      = ocfs2_fallocate,
2867         .remap_file_range = ocfs2_remap_file_range,
2868 };
2869
2870 const struct file_operations ocfs2_dops_no_plocks = {
2871         .llseek         = ocfs2_dir_llseek,
2872         .read           = generic_read_dir,
2873         .iterate_shared = shared_ocfs2_readdir,
2874         .fsync          = ocfs2_sync_file,
2875         .release        = ocfs2_dir_release,
2876         .open           = ocfs2_dir_open,
2877         .unlocked_ioctl = ocfs2_ioctl,
2878 #ifdef CONFIG_COMPAT
2879         .compat_ioctl   = ocfs2_compat_ioctl,
2880 #endif
2881         .flock          = ocfs2_flock,
2882 };