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Linux/fs/ocfs2/file.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /* -*- mode: c; c-basic-offset: 8; -*-
  3  * vim: noexpandtab sw=8 ts=8 sts=0:
  4  *
  5  * file.c
  6  *
  7  * File open, close, extend, truncate
  8  *
  9  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 10  */
 11 
 12 #include <linux/capability.h>
 13 #include <linux/fs.h>
 14 #include <linux/types.h>
 15 #include <linux/slab.h>
 16 #include <linux/highmem.h>
 17 #include <linux/pagemap.h>
 18 #include <linux/uio.h>
 19 #include <linux/sched.h>
 20 #include <linux/splice.h>
 21 #include <linux/mount.h>
 22 #include <linux/writeback.h>
 23 #include <linux/falloc.h>
 24 #include <linux/quotaops.h>
 25 #include <linux/blkdev.h>
 26 #include <linux/backing-dev.h>
 27 
 28 #include <cluster/masklog.h>
 29 
 30 #include "ocfs2.h"
 31 
 32 #include "alloc.h"
 33 #include "aops.h"
 34 #include "dir.h"
 35 #include "dlmglue.h"
 36 #include "extent_map.h"
 37 #include "file.h"
 38 #include "sysfile.h"
 39 #include "inode.h"
 40 #include "ioctl.h"
 41 #include "journal.h"
 42 #include "locks.h"
 43 #include "mmap.h"
 44 #include "suballoc.h"
 45 #include "super.h"
 46 #include "xattr.h"
 47 #include "acl.h"
 48 #include "quota.h"
 49 #include "refcounttree.h"
 50 #include "ocfs2_trace.h"
 51 
 52 #include "buffer_head_io.h"
 53 
 54 static int ocfs2_init_file_private(struct inode *inode, struct file *file)
 55 {
 56         struct ocfs2_file_private *fp;
 57 
 58         fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
 59         if (!fp)
 60                 return -ENOMEM;
 61 
 62         fp->fp_file = file;
 63         mutex_init(&fp->fp_mutex);
 64         ocfs2_file_lock_res_init(&fp->fp_flock, fp);
 65         file->private_data = fp;
 66 
 67         return 0;
 68 }
 69 
 70 static void ocfs2_free_file_private(struct inode *inode, struct file *file)
 71 {
 72         struct ocfs2_file_private *fp = file->private_data;
 73         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 74 
 75         if (fp) {
 76                 ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
 77                 ocfs2_lock_res_free(&fp->fp_flock);
 78                 kfree(fp);
 79                 file->private_data = NULL;
 80         }
 81 }
 82 
 83 static int ocfs2_file_open(struct inode *inode, struct file *file)
 84 {
 85         int status;
 86         int mode = file->f_flags;
 87         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 88 
 89         trace_ocfs2_file_open(inode, file, file->f_path.dentry,
 90                               (unsigned long long)oi->ip_blkno,
 91                               file->f_path.dentry->d_name.len,
 92                               file->f_path.dentry->d_name.name, mode);
 93 
 94         if (file->f_mode & FMODE_WRITE) {
 95                 status = dquot_initialize(inode);
 96                 if (status)
 97                         goto leave;
 98         }
 99 
100         spin_lock(&oi->ip_lock);
101 
102         /* Check that the inode hasn't been wiped from disk by another
103          * node. If it hasn't then we're safe as long as we hold the
104          * spin lock until our increment of open count. */
105         if (oi->ip_flags & OCFS2_INODE_DELETED) {
106                 spin_unlock(&oi->ip_lock);
107 
108                 status = -ENOENT;
109                 goto leave;
110         }
111 
112         if (mode & O_DIRECT)
113                 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
114 
115         oi->ip_open_count++;
116         spin_unlock(&oi->ip_lock);
117 
118         status = ocfs2_init_file_private(inode, file);
119         if (status) {
120                 /*
121                  * We want to set open count back if we're failing the
122                  * open.
123                  */
124                 spin_lock(&oi->ip_lock);
125                 oi->ip_open_count--;
126                 spin_unlock(&oi->ip_lock);
127         }
128 
129         file->f_mode |= FMODE_NOWAIT;
130 
131 leave:
132         return status;
133 }
134 
135 static int ocfs2_file_release(struct inode *inode, struct file *file)
136 {
137         struct ocfs2_inode_info *oi = OCFS2_I(inode);
138 
139         spin_lock(&oi->ip_lock);
140         if (!--oi->ip_open_count)
141                 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
142 
143         trace_ocfs2_file_release(inode, file, file->f_path.dentry,
144                                  oi->ip_blkno,
145                                  file->f_path.dentry->d_name.len,
146                                  file->f_path.dentry->d_name.name,
147                                  oi->ip_open_count);
148         spin_unlock(&oi->ip_lock);
149 
150         ocfs2_free_file_private(inode, file);
151 
152         return 0;
153 }
154 
155 static int ocfs2_dir_open(struct inode *inode, struct file *file)
156 {
157         return ocfs2_init_file_private(inode, file);
158 }
159 
160 static int ocfs2_dir_release(struct inode *inode, struct file *file)
161 {
162         ocfs2_free_file_private(inode, file);
163         return 0;
164 }
165 
166 static int ocfs2_sync_file(struct file *file, loff_t start, loff_t end,
167                            int datasync)
168 {
169         int err = 0;
170         struct inode *inode = file->f_mapping->host;
171         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
172         struct ocfs2_inode_info *oi = OCFS2_I(inode);
173         journal_t *journal = osb->journal->j_journal;
174         int ret;
175         tid_t commit_tid;
176         bool needs_barrier = false;
177 
178         trace_ocfs2_sync_file(inode, file, file->f_path.dentry,
179                               oi->ip_blkno,
180                               file->f_path.dentry->d_name.len,
181                               file->f_path.dentry->d_name.name,
182                               (unsigned long long)datasync);
183 
184         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
185                 return -EROFS;
186 
187         err = file_write_and_wait_range(file, start, end);
188         if (err)
189                 return err;
190 
191         commit_tid = datasync ? oi->i_datasync_tid : oi->i_sync_tid;
192         if (journal->j_flags & JBD2_BARRIER &&
193             !jbd2_trans_will_send_data_barrier(journal, commit_tid))
194                 needs_barrier = true;
195         err = jbd2_complete_transaction(journal, commit_tid);
196         if (needs_barrier) {
197                 ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
198                 if (!err)
199                         err = ret;
200         }
201 
202         if (err)
203                 mlog_errno(err);
204 
205         return (err < 0) ? -EIO : 0;
206 }
207 
208 int ocfs2_should_update_atime(struct inode *inode,
209                               struct vfsmount *vfsmnt)
210 {
211         struct timespec64 now;
212         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
213 
214         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
215                 return 0;
216 
217         if ((inode->i_flags & S_NOATIME) ||
218             ((inode->i_sb->s_flags & SB_NODIRATIME) && S_ISDIR(inode->i_mode)))
219                 return 0;
220 
221         /*
222          * We can be called with no vfsmnt structure - NFSD will
223          * sometimes do this.
224          *
225          * Note that our action here is different than touch_atime() -
226          * if we can't tell whether this is a noatime mount, then we
227          * don't know whether to trust the value of s_atime_quantum.
228          */
229         if (vfsmnt == NULL)
230                 return 0;
231 
232         if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
233             ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
234                 return 0;
235 
236         if (vfsmnt->mnt_flags & MNT_RELATIME) {
237                 if ((timespec64_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
238                     (timespec64_compare(&inode->i_atime, &inode->i_ctime) <= 0))
239                         return 1;
240 
241                 return 0;
242         }
243 
244         now = current_time(inode);
245         if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
246                 return 0;
247         else
248                 return 1;
249 }
250 
251 int ocfs2_update_inode_atime(struct inode *inode,
252                              struct buffer_head *bh)
253 {
254         int ret;
255         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
256         handle_t *handle;
257         struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
258 
259         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
260         if (IS_ERR(handle)) {
261                 ret = PTR_ERR(handle);
262                 mlog_errno(ret);
263                 goto out;
264         }
265 
266         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
267                                       OCFS2_JOURNAL_ACCESS_WRITE);
268         if (ret) {
269                 mlog_errno(ret);
270                 goto out_commit;
271         }
272 
273         /*
274          * Don't use ocfs2_mark_inode_dirty() here as we don't always
275          * have i_mutex to guard against concurrent changes to other
276          * inode fields.
277          */
278         inode->i_atime = current_time(inode);
279         di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
280         di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
281         ocfs2_update_inode_fsync_trans(handle, inode, 0);
282         ocfs2_journal_dirty(handle, bh);
283 
284 out_commit:
285         ocfs2_commit_trans(osb, handle);
286 out:
287         return ret;
288 }
289 
290 int ocfs2_set_inode_size(handle_t *handle,
291                                 struct inode *inode,
292                                 struct buffer_head *fe_bh,
293                                 u64 new_i_size)
294 {
295         int status;
296 
297         i_size_write(inode, new_i_size);
298         inode->i_blocks = ocfs2_inode_sector_count(inode);
299         inode->i_ctime = inode->i_mtime = current_time(inode);
300 
301         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
302         if (status < 0) {
303                 mlog_errno(status);
304                 goto bail;
305         }
306 
307 bail:
308         return status;
309 }
310 
311 int ocfs2_simple_size_update(struct inode *inode,
312                              struct buffer_head *di_bh,
313                              u64 new_i_size)
314 {
315         int ret;
316         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
317         handle_t *handle = NULL;
318 
319         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
320         if (IS_ERR(handle)) {
321                 ret = PTR_ERR(handle);
322                 mlog_errno(ret);
323                 goto out;
324         }
325 
326         ret = ocfs2_set_inode_size(handle, inode, di_bh,
327                                    new_i_size);
328         if (ret < 0)
329                 mlog_errno(ret);
330 
331         ocfs2_update_inode_fsync_trans(handle, inode, 0);
332         ocfs2_commit_trans(osb, handle);
333 out:
334         return ret;
335 }
336 
337 static int ocfs2_cow_file_pos(struct inode *inode,
338                               struct buffer_head *fe_bh,
339                               u64 offset)
340 {
341         int status;
342         u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
343         unsigned int num_clusters = 0;
344         unsigned int ext_flags = 0;
345 
346         /*
347          * If the new offset is aligned to the range of the cluster, there is
348          * no space for ocfs2_zero_range_for_truncate to fill, so no need to
349          * CoW either.
350          */
351         if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
352                 return 0;
353 
354         status = ocfs2_get_clusters(inode, cpos, &phys,
355                                     &num_clusters, &ext_flags);
356         if (status) {
357                 mlog_errno(status);
358                 goto out;
359         }
360 
361         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
362                 goto out;
363 
364         return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1);
365 
366 out:
367         return status;
368 }
369 
370 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
371                                      struct inode *inode,
372                                      struct buffer_head *fe_bh,
373                                      u64 new_i_size)
374 {
375         int status;
376         handle_t *handle;
377         struct ocfs2_dinode *di;
378         u64 cluster_bytes;
379 
380         /*
381          * We need to CoW the cluster contains the offset if it is reflinked
382          * since we will call ocfs2_zero_range_for_truncate later which will
383          * write "" from offset to the end of the cluster.
384          */
385         status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
386         if (status) {
387                 mlog_errno(status);
388                 return status;
389         }
390 
391         /* TODO: This needs to actually orphan the inode in this
392          * transaction. */
393 
394         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
395         if (IS_ERR(handle)) {
396                 status = PTR_ERR(handle);
397                 mlog_errno(status);
398                 goto out;
399         }
400 
401         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
402                                          OCFS2_JOURNAL_ACCESS_WRITE);
403         if (status < 0) {
404                 mlog_errno(status);
405                 goto out_commit;
406         }
407 
408         /*
409          * Do this before setting i_size.
410          */
411         cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
412         status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
413                                                cluster_bytes);
414         if (status) {
415                 mlog_errno(status);
416                 goto out_commit;
417         }
418 
419         i_size_write(inode, new_i_size);
420         inode->i_ctime = inode->i_mtime = current_time(inode);
421 
422         di = (struct ocfs2_dinode *) fe_bh->b_data;
423         di->i_size = cpu_to_le64(new_i_size);
424         di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
425         di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
426         ocfs2_update_inode_fsync_trans(handle, inode, 0);
427 
428         ocfs2_journal_dirty(handle, fe_bh);
429 
430 out_commit:
431         ocfs2_commit_trans(osb, handle);
432 out:
433         return status;
434 }
435 
436 int ocfs2_truncate_file(struct inode *inode,
437                                struct buffer_head *di_bh,
438                                u64 new_i_size)
439 {
440         int status = 0;
441         struct ocfs2_dinode *fe = NULL;
442         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
443 
444         /* We trust di_bh because it comes from ocfs2_inode_lock(), which
445          * already validated it */
446         fe = (struct ocfs2_dinode *) di_bh->b_data;
447 
448         trace_ocfs2_truncate_file((unsigned long long)OCFS2_I(inode)->ip_blkno,
449                                   (unsigned long long)le64_to_cpu(fe->i_size),
450                                   (unsigned long long)new_i_size);
451 
452         mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
453                         "Inode %llu, inode i_size = %lld != di "
454                         "i_size = %llu, i_flags = 0x%x\n",
455                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
456                         i_size_read(inode),
457                         (unsigned long long)le64_to_cpu(fe->i_size),
458                         le32_to_cpu(fe->i_flags));
459 
460         if (new_i_size > le64_to_cpu(fe->i_size)) {
461                 trace_ocfs2_truncate_file_error(
462                         (unsigned long long)le64_to_cpu(fe->i_size),
463                         (unsigned long long)new_i_size);
464                 status = -EINVAL;
465                 mlog_errno(status);
466                 goto bail;
467         }
468 
469         down_write(&OCFS2_I(inode)->ip_alloc_sem);
470 
471         ocfs2_resv_discard(&osb->osb_la_resmap,
472                            &OCFS2_I(inode)->ip_la_data_resv);
473 
474         /*
475          * The inode lock forced other nodes to sync and drop their
476          * pages, which (correctly) happens even if we have a truncate
477          * without allocation change - ocfs2 cluster sizes can be much
478          * greater than page size, so we have to truncate them
479          * anyway.
480          */
481         unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
482         truncate_inode_pages(inode->i_mapping, new_i_size);
483 
484         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
485                 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
486                                                i_size_read(inode), 1);
487                 if (status)
488                         mlog_errno(status);
489 
490                 goto bail_unlock_sem;
491         }
492 
493         /* alright, we're going to need to do a full blown alloc size
494          * change. Orphan the inode so that recovery can complete the
495          * truncate if necessary. This does the task of marking
496          * i_size. */
497         status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
498         if (status < 0) {
499                 mlog_errno(status);
500                 goto bail_unlock_sem;
501         }
502 
503         status = ocfs2_commit_truncate(osb, inode, di_bh);
504         if (status < 0) {
505                 mlog_errno(status);
506                 goto bail_unlock_sem;
507         }
508 
509         /* TODO: orphan dir cleanup here. */
510 bail_unlock_sem:
511         up_write(&OCFS2_I(inode)->ip_alloc_sem);
512 
513 bail:
514         if (!status && OCFS2_I(inode)->ip_clusters == 0)
515                 status = ocfs2_try_remove_refcount_tree(inode, di_bh);
516 
517         return status;
518 }
519 
520 /*
521  * extend file allocation only here.
522  * we'll update all the disk stuff, and oip->alloc_size
523  *
524  * expect stuff to be locked, a transaction started and enough data /
525  * metadata reservations in the contexts.
526  *
527  * Will return -EAGAIN, and a reason if a restart is needed.
528  * If passed in, *reason will always be set, even in error.
529  */
530 int ocfs2_add_inode_data(struct ocfs2_super *osb,
531                          struct inode *inode,
532                          u32 *logical_offset,
533                          u32 clusters_to_add,
534                          int mark_unwritten,
535                          struct buffer_head *fe_bh,
536                          handle_t *handle,
537                          struct ocfs2_alloc_context *data_ac,
538                          struct ocfs2_alloc_context *meta_ac,
539                          enum ocfs2_alloc_restarted *reason_ret)
540 {
541         int ret;
542         struct ocfs2_extent_tree et;
543 
544         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
545         ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
546                                           clusters_to_add, mark_unwritten,
547                                           data_ac, meta_ac, reason_ret);
548 
549         return ret;
550 }
551 
552 static int ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
553                                    u32 clusters_to_add, int mark_unwritten)
554 {
555         int status = 0;
556         int restart_func = 0;
557         int credits;
558         u32 prev_clusters;
559         struct buffer_head *bh = NULL;
560         struct ocfs2_dinode *fe = NULL;
561         handle_t *handle = NULL;
562         struct ocfs2_alloc_context *data_ac = NULL;
563         struct ocfs2_alloc_context *meta_ac = NULL;
564         enum ocfs2_alloc_restarted why = RESTART_NONE;
565         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
566         struct ocfs2_extent_tree et;
567         int did_quota = 0;
568 
569         /*
570          * Unwritten extent only exists for file systems which
571          * support holes.
572          */
573         BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
574 
575         status = ocfs2_read_inode_block(inode, &bh);
576         if (status < 0) {
577                 mlog_errno(status);
578                 goto leave;
579         }
580         fe = (struct ocfs2_dinode *) bh->b_data;
581 
582 restart_all:
583         BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
584 
585         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
586         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
587                                        &data_ac, &meta_ac);
588         if (status) {
589                 mlog_errno(status);
590                 goto leave;
591         }
592 
593         credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list);
594         handle = ocfs2_start_trans(osb, credits);
595         if (IS_ERR(handle)) {
596                 status = PTR_ERR(handle);
597                 handle = NULL;
598                 mlog_errno(status);
599                 goto leave;
600         }
601 
602 restarted_transaction:
603         trace_ocfs2_extend_allocation(
604                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
605                 (unsigned long long)i_size_read(inode),
606                 le32_to_cpu(fe->i_clusters), clusters_to_add,
607                 why, restart_func);
608 
609         status = dquot_alloc_space_nodirty(inode,
610                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
611         if (status)
612                 goto leave;
613         did_quota = 1;
614 
615         /* reserve a write to the file entry early on - that we if we
616          * run out of credits in the allocation path, we can still
617          * update i_size. */
618         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
619                                          OCFS2_JOURNAL_ACCESS_WRITE);
620         if (status < 0) {
621                 mlog_errno(status);
622                 goto leave;
623         }
624 
625         prev_clusters = OCFS2_I(inode)->ip_clusters;
626 
627         status = ocfs2_add_inode_data(osb,
628                                       inode,
629                                       &logical_start,
630                                       clusters_to_add,
631                                       mark_unwritten,
632                                       bh,
633                                       handle,
634                                       data_ac,
635                                       meta_ac,
636                                       &why);
637         if ((status < 0) && (status != -EAGAIN)) {
638                 if (status != -ENOSPC)
639                         mlog_errno(status);
640                 goto leave;
641         }
642         ocfs2_update_inode_fsync_trans(handle, inode, 1);
643         ocfs2_journal_dirty(handle, bh);
644 
645         spin_lock(&OCFS2_I(inode)->ip_lock);
646         clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
647         spin_unlock(&OCFS2_I(inode)->ip_lock);
648         /* Release unused quota reservation */
649         dquot_free_space(inode,
650                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
651         did_quota = 0;
652 
653         if (why != RESTART_NONE && clusters_to_add) {
654                 if (why == RESTART_META) {
655                         restart_func = 1;
656                         status = 0;
657                 } else {
658                         BUG_ON(why != RESTART_TRANS);
659 
660                         status = ocfs2_allocate_extend_trans(handle, 1);
661                         if (status < 0) {
662                                 /* handle still has to be committed at
663                                  * this point. */
664                                 status = -ENOMEM;
665                                 mlog_errno(status);
666                                 goto leave;
667                         }
668                         goto restarted_transaction;
669                 }
670         }
671 
672         trace_ocfs2_extend_allocation_end(OCFS2_I(inode)->ip_blkno,
673              le32_to_cpu(fe->i_clusters),
674              (unsigned long long)le64_to_cpu(fe->i_size),
675              OCFS2_I(inode)->ip_clusters,
676              (unsigned long long)i_size_read(inode));
677 
678 leave:
679         if (status < 0 && did_quota)
680                 dquot_free_space(inode,
681                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
682         if (handle) {
683                 ocfs2_commit_trans(osb, handle);
684                 handle = NULL;
685         }
686         if (data_ac) {
687                 ocfs2_free_alloc_context(data_ac);
688                 data_ac = NULL;
689         }
690         if (meta_ac) {
691                 ocfs2_free_alloc_context(meta_ac);
692                 meta_ac = NULL;
693         }
694         if ((!status) && restart_func) {
695                 restart_func = 0;
696                 goto restart_all;
697         }
698         brelse(bh);
699         bh = NULL;
700 
701         return status;
702 }
703 
704 /*
705  * While a write will already be ordering the data, a truncate will not.
706  * Thus, we need to explicitly order the zeroed pages.
707  */
708 static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode,
709                                                 struct buffer_head *di_bh)
710 {
711         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
712         handle_t *handle = NULL;
713         int ret = 0;
714 
715         if (!ocfs2_should_order_data(inode))
716                 goto out;
717 
718         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
719         if (IS_ERR(handle)) {
720                 ret = -ENOMEM;
721                 mlog_errno(ret);
722                 goto out;
723         }
724 
725         ret = ocfs2_jbd2_file_inode(handle, inode);
726         if (ret < 0) {
727                 mlog_errno(ret);
728                 goto out;
729         }
730 
731         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
732                                       OCFS2_JOURNAL_ACCESS_WRITE);
733         if (ret)
734                 mlog_errno(ret);
735         ocfs2_update_inode_fsync_trans(handle, inode, 1);
736 
737 out:
738         if (ret) {
739                 if (!IS_ERR(handle))
740                         ocfs2_commit_trans(osb, handle);
741                 handle = ERR_PTR(ret);
742         }
743         return handle;
744 }
745 
746 /* Some parts of this taken from generic_cont_expand, which turned out
747  * to be too fragile to do exactly what we need without us having to
748  * worry about recursive locking in ->write_begin() and ->write_end(). */
749 static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
750                                  u64 abs_to, struct buffer_head *di_bh)
751 {
752         struct address_space *mapping = inode->i_mapping;
753         struct page *page;
754         unsigned long index = abs_from >> PAGE_SHIFT;
755         handle_t *handle;
756         int ret = 0;
757         unsigned zero_from, zero_to, block_start, block_end;
758         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
759 
760         BUG_ON(abs_from >= abs_to);
761         BUG_ON(abs_to > (((u64)index + 1) << PAGE_SHIFT));
762         BUG_ON(abs_from & (inode->i_blkbits - 1));
763 
764         handle = ocfs2_zero_start_ordered_transaction(inode, di_bh);
765         if (IS_ERR(handle)) {
766                 ret = PTR_ERR(handle);
767                 goto out;
768         }
769 
770         page = find_or_create_page(mapping, index, GFP_NOFS);
771         if (!page) {
772                 ret = -ENOMEM;
773                 mlog_errno(ret);
774                 goto out_commit_trans;
775         }
776 
777         /* Get the offsets within the page that we want to zero */
778         zero_from = abs_from & (PAGE_SIZE - 1);
779         zero_to = abs_to & (PAGE_SIZE - 1);
780         if (!zero_to)
781                 zero_to = PAGE_SIZE;
782 
783         trace_ocfs2_write_zero_page(
784                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
785                         (unsigned long long)abs_from,
786                         (unsigned long long)abs_to,
787                         index, zero_from, zero_to);
788 
789         /* We know that zero_from is block aligned */
790         for (block_start = zero_from; block_start < zero_to;
791              block_start = block_end) {
792                 block_end = block_start + i_blocksize(inode);
793 
794                 /*
795                  * block_start is block-aligned.  Bump it by one to force
796                  * __block_write_begin and block_commit_write to zero the
797                  * whole block.
798                  */
799                 ret = __block_write_begin(page, block_start + 1, 0,
800                                           ocfs2_get_block);
801                 if (ret < 0) {
802                         mlog_errno(ret);
803                         goto out_unlock;
804                 }
805 
806 
807                 /* must not update i_size! */
808                 ret = block_commit_write(page, block_start + 1,
809                                          block_start + 1);
810                 if (ret < 0)
811                         mlog_errno(ret);
812                 else
813                         ret = 0;
814         }
815 
816         /*
817          * fs-writeback will release the dirty pages without page lock
818          * whose offset are over inode size, the release happens at
819          * block_write_full_page().
820          */
821         i_size_write(inode, abs_to);
822         inode->i_blocks = ocfs2_inode_sector_count(inode);
823         di->i_size = cpu_to_le64((u64)i_size_read(inode));
824         inode->i_mtime = inode->i_ctime = current_time(inode);
825         di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
826         di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
827         di->i_mtime_nsec = di->i_ctime_nsec;
828         if (handle) {
829                 ocfs2_journal_dirty(handle, di_bh);
830                 ocfs2_update_inode_fsync_trans(handle, inode, 1);
831         }
832 
833 out_unlock:
834         unlock_page(page);
835         put_page(page);
836 out_commit_trans:
837         if (handle)
838                 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
839 out:
840         return ret;
841 }
842 
843 /*
844  * Find the next range to zero.  We do this in terms of bytes because
845  * that's what ocfs2_zero_extend() wants, and it is dealing with the
846  * pagecache.  We may return multiple extents.
847  *
848  * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
849  * needs to be zeroed.  range_start and range_end return the next zeroing
850  * range.  A subsequent call should pass the previous range_end as its
851  * zero_start.  If range_end is 0, there's nothing to do.
852  *
853  * Unwritten extents are skipped over.  Refcounted extents are CoWd.
854  */
855 static int ocfs2_zero_extend_get_range(struct inode *inode,
856                                        struct buffer_head *di_bh,
857                                        u64 zero_start, u64 zero_end,
858                                        u64 *range_start, u64 *range_end)
859 {
860         int rc = 0, needs_cow = 0;
861         u32 p_cpos, zero_clusters = 0;
862         u32 zero_cpos =
863                 zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
864         u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
865         unsigned int num_clusters = 0;
866         unsigned int ext_flags = 0;
867 
868         while (zero_cpos < last_cpos) {
869                 rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
870                                         &num_clusters, &ext_flags);
871                 if (rc) {
872                         mlog_errno(rc);
873                         goto out;
874                 }
875 
876                 if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
877                         zero_clusters = num_clusters;
878                         if (ext_flags & OCFS2_EXT_REFCOUNTED)
879                                 needs_cow = 1;
880                         break;
881                 }
882 
883                 zero_cpos += num_clusters;
884         }
885         if (!zero_clusters) {
886                 *range_end = 0;
887                 goto out;
888         }
889 
890         while ((zero_cpos + zero_clusters) < last_cpos) {
891                 rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
892                                         &p_cpos, &num_clusters,
893                                         &ext_flags);
894                 if (rc) {
895                         mlog_errno(rc);
896                         goto out;
897                 }
898 
899                 if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
900                         break;
901                 if (ext_flags & OCFS2_EXT_REFCOUNTED)
902                         needs_cow = 1;
903                 zero_clusters += num_clusters;
904         }
905         if ((zero_cpos + zero_clusters) > last_cpos)
906                 zero_clusters = last_cpos - zero_cpos;
907 
908         if (needs_cow) {
909                 rc = ocfs2_refcount_cow(inode, di_bh, zero_cpos,
910                                         zero_clusters, UINT_MAX);
911                 if (rc) {
912                         mlog_errno(rc);
913                         goto out;
914                 }
915         }
916 
917         *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
918         *range_end = ocfs2_clusters_to_bytes(inode->i_sb,
919                                              zero_cpos + zero_clusters);
920 
921 out:
922         return rc;
923 }
924 
925 /*
926  * Zero one range returned from ocfs2_zero_extend_get_range().  The caller
927  * has made sure that the entire range needs zeroing.
928  */
929 static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
930                                    u64 range_end, struct buffer_head *di_bh)
931 {
932         int rc = 0;
933         u64 next_pos;
934         u64 zero_pos = range_start;
935 
936         trace_ocfs2_zero_extend_range(
937                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
938                         (unsigned long long)range_start,
939                         (unsigned long long)range_end);
940         BUG_ON(range_start >= range_end);
941 
942         while (zero_pos < range_end) {
943                 next_pos = (zero_pos & PAGE_MASK) + PAGE_SIZE;
944                 if (next_pos > range_end)
945                         next_pos = range_end;
946                 rc = ocfs2_write_zero_page(inode, zero_pos, next_pos, di_bh);
947                 if (rc < 0) {
948                         mlog_errno(rc);
949                         break;
950                 }
951                 zero_pos = next_pos;
952 
953                 /*
954                  * Very large extends have the potential to lock up
955                  * the cpu for extended periods of time.
956                  */
957                 cond_resched();
958         }
959 
960         return rc;
961 }
962 
963 int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
964                       loff_t zero_to_size)
965 {
966         int ret = 0;
967         u64 zero_start, range_start = 0, range_end = 0;
968         struct super_block *sb = inode->i_sb;
969 
970         zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
971         trace_ocfs2_zero_extend((unsigned long long)OCFS2_I(inode)->ip_blkno,
972                                 (unsigned long long)zero_start,
973                                 (unsigned long long)i_size_read(inode));
974         while (zero_start < zero_to_size) {
975                 ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
976                                                   zero_to_size,
977                                                   &range_start,
978                                                   &range_end);
979                 if (ret) {
980                         mlog_errno(ret);
981                         break;
982                 }
983                 if (!range_end)
984                         break;
985                 /* Trim the ends */
986                 if (range_start < zero_start)
987                         range_start = zero_start;
988                 if (range_end > zero_to_size)
989                         range_end = zero_to_size;
990 
991                 ret = ocfs2_zero_extend_range(inode, range_start,
992                                               range_end, di_bh);
993                 if (ret) {
994                         mlog_errno(ret);
995                         break;
996                 }
997                 zero_start = range_end;
998         }
999 
1000         return ret;
1001 }
1002 
1003 int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
1004                           u64 new_i_size, u64 zero_to)
1005 {
1006         int ret;
1007         u32 clusters_to_add;
1008         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1009 
1010         /*
1011          * Only quota files call this without a bh, and they can't be
1012          * refcounted.
1013          */
1014         BUG_ON(!di_bh && ocfs2_is_refcount_inode(inode));
1015         BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
1016 
1017         clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
1018         if (clusters_to_add < oi->ip_clusters)
1019                 clusters_to_add = 0;
1020         else
1021                 clusters_to_add -= oi->ip_clusters;
1022 
1023         if (clusters_to_add) {
1024                 ret = ocfs2_extend_allocation(inode, oi->ip_clusters,
1025                                               clusters_to_add, 0);
1026                 if (ret) {
1027                         mlog_errno(ret);
1028                         goto out;
1029                 }
1030         }
1031 
1032         /*
1033          * Call this even if we don't add any clusters to the tree. We
1034          * still need to zero the area between the old i_size and the
1035          * new i_size.
1036          */
1037         ret = ocfs2_zero_extend(inode, di_bh, zero_to);
1038         if (ret < 0)
1039                 mlog_errno(ret);
1040 
1041 out:
1042         return ret;
1043 }
1044 
1045 static int ocfs2_extend_file(struct inode *inode,
1046                              struct buffer_head *di_bh,
1047                              u64 new_i_size)
1048 {
1049         int ret = 0;
1050         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1051 
1052         BUG_ON(!di_bh);
1053 
1054         /* setattr sometimes calls us like this. */
1055         if (new_i_size == 0)
1056                 goto out;
1057 
1058         if (i_size_read(inode) == new_i_size)
1059                 goto out;
1060         BUG_ON(new_i_size < i_size_read(inode));
1061 
1062         /*
1063          * The alloc sem blocks people in read/write from reading our
1064          * allocation until we're done changing it. We depend on
1065          * i_mutex to block other extend/truncate calls while we're
1066          * here.  We even have to hold it for sparse files because there
1067          * might be some tail zeroing.
1068          */
1069         down_write(&oi->ip_alloc_sem);
1070 
1071         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1072                 /*
1073                  * We can optimize small extends by keeping the inodes
1074                  * inline data.
1075                  */
1076                 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1077                         up_write(&oi->ip_alloc_sem);
1078                         goto out_update_size;
1079                 }
1080 
1081                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1082                 if (ret) {
1083                         up_write(&oi->ip_alloc_sem);
1084                         mlog_errno(ret);
1085                         goto out;
1086                 }
1087         }
1088 
1089         if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1090                 ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1091         else
1092                 ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1093                                             new_i_size);
1094 
1095         up_write(&oi->ip_alloc_sem);
1096 
1097         if (ret < 0) {
1098                 mlog_errno(ret);
1099                 goto out;
1100         }
1101 
1102 out_update_size:
1103         ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1104         if (ret < 0)
1105                 mlog_errno(ret);
1106 
1107 out:
1108         return ret;
1109 }
1110 
1111 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1112 {
1113         int status = 0, size_change;
1114         int inode_locked = 0;
1115         struct inode *inode = d_inode(dentry);
1116         struct super_block *sb = inode->i_sb;
1117         struct ocfs2_super *osb = OCFS2_SB(sb);
1118         struct buffer_head *bh = NULL;
1119         handle_t *handle = NULL;
1120         struct dquot *transfer_to[MAXQUOTAS] = { };
1121         int qtype;
1122         int had_lock;
1123         struct ocfs2_lock_holder oh;
1124 
1125         trace_ocfs2_setattr(inode, dentry,
1126                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
1127                             dentry->d_name.len, dentry->d_name.name,
1128                             attr->ia_valid, attr->ia_mode,
1129                             from_kuid(&init_user_ns, attr->ia_uid),
1130                             from_kgid(&init_user_ns, attr->ia_gid));
1131 
1132         /* ensuring we don't even attempt to truncate a symlink */
1133         if (S_ISLNK(inode->i_mode))
1134                 attr->ia_valid &= ~ATTR_SIZE;
1135 
1136 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1137                            | ATTR_GID | ATTR_UID | ATTR_MODE)
1138         if (!(attr->ia_valid & OCFS2_VALID_ATTRS))
1139                 return 0;
1140 
1141         status = setattr_prepare(dentry, attr);
1142         if (status)
1143                 return status;
1144 
1145         if (is_quota_modification(inode, attr)) {
1146                 status = dquot_initialize(inode);
1147                 if (status)
1148                         return status;
1149         }
1150         size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1151         if (size_change) {
1152                 /*
1153                  * Here we should wait dio to finish before inode lock
1154                  * to avoid a deadlock between ocfs2_setattr() and
1155                  * ocfs2_dio_end_io_write()
1156                  */
1157                 inode_dio_wait(inode);
1158 
1159                 status = ocfs2_rw_lock(inode, 1);
1160                 if (status < 0) {
1161                         mlog_errno(status);
1162                         goto bail;
1163                 }
1164         }
1165 
1166         had_lock = ocfs2_inode_lock_tracker(inode, &bh, 1, &oh);
1167         if (had_lock < 0) {
1168                 status = had_lock;
1169                 goto bail_unlock_rw;
1170         } else if (had_lock) {
1171                 /*
1172                  * As far as we know, ocfs2_setattr() could only be the first
1173                  * VFS entry point in the call chain of recursive cluster
1174                  * locking issue.
1175                  *
1176                  * For instance:
1177                  * chmod_common()
1178                  *  notify_change()
1179                  *   ocfs2_setattr()
1180                  *    posix_acl_chmod()
1181                  *     ocfs2_iop_get_acl()
1182                  *
1183                  * But, we're not 100% sure if it's always true, because the
1184                  * ordering of the VFS entry points in the call chain is out
1185                  * of our control. So, we'd better dump the stack here to
1186                  * catch the other cases of recursive locking.
1187                  */
1188                 mlog(ML_ERROR, "Another case of recursive locking:\n");
1189                 dump_stack();
1190         }
1191         inode_locked = 1;
1192 
1193         if (size_change) {
1194                 status = inode_newsize_ok(inode, attr->ia_size);
1195                 if (status)
1196                         goto bail_unlock;
1197 
1198                 if (i_size_read(inode) >= attr->ia_size) {
1199                         if (ocfs2_should_order_data(inode)) {
1200                                 status = ocfs2_begin_ordered_truncate(inode,
1201                                                                       attr->ia_size);
1202                                 if (status)
1203                                         goto bail_unlock;
1204                         }
1205                         status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1206                 } else
1207                         status = ocfs2_extend_file(inode, bh, attr->ia_size);
1208                 if (status < 0) {
1209                         if (status != -ENOSPC)
1210                                 mlog_errno(status);
1211                         status = -ENOSPC;
1212                         goto bail_unlock;
1213                 }
1214         }
1215 
1216         if ((attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
1217             (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
1218                 /*
1219                  * Gather pointers to quota structures so that allocation /
1220                  * freeing of quota structures happens here and not inside
1221                  * dquot_transfer() where we have problems with lock ordering
1222                  */
1223                 if (attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)
1224                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1225                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1226                         transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(attr->ia_uid));
1227                         if (IS_ERR(transfer_to[USRQUOTA])) {
1228                                 status = PTR_ERR(transfer_to[USRQUOTA]);
1229                                 goto bail_unlock;
1230                         }
1231                 }
1232                 if (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid)
1233                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1234                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1235                         transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(attr->ia_gid));
1236                         if (IS_ERR(transfer_to[GRPQUOTA])) {
1237                                 status = PTR_ERR(transfer_to[GRPQUOTA]);
1238                                 goto bail_unlock;
1239                         }
1240                 }
1241                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1242                                            2 * ocfs2_quota_trans_credits(sb));
1243                 if (IS_ERR(handle)) {
1244                         status = PTR_ERR(handle);
1245                         mlog_errno(status);
1246                         goto bail_unlock;
1247                 }
1248                 status = __dquot_transfer(inode, transfer_to);
1249                 if (status < 0)
1250                         goto bail_commit;
1251         } else {
1252                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1253                 if (IS_ERR(handle)) {
1254                         status = PTR_ERR(handle);
1255                         mlog_errno(status);
1256                         goto bail_unlock;
1257                 }
1258         }
1259 
1260         setattr_copy(inode, attr);
1261         mark_inode_dirty(inode);
1262 
1263         status = ocfs2_mark_inode_dirty(handle, inode, bh);
1264         if (status < 0)
1265                 mlog_errno(status);
1266 
1267 bail_commit:
1268         ocfs2_commit_trans(osb, handle);
1269 bail_unlock:
1270         if (status && inode_locked) {
1271                 ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
1272                 inode_locked = 0;
1273         }
1274 bail_unlock_rw:
1275         if (size_change)
1276                 ocfs2_rw_unlock(inode, 1);
1277 bail:
1278 
1279         /* Release quota pointers in case we acquired them */
1280         for (qtype = 0; qtype < OCFS2_MAXQUOTAS; qtype++)
1281                 dqput(transfer_to[qtype]);
1282 
1283         if (!status && attr->ia_valid & ATTR_MODE) {
1284                 status = ocfs2_acl_chmod(inode, bh);
1285                 if (status < 0)
1286                         mlog_errno(status);
1287         }
1288         if (inode_locked)
1289                 ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
1290 
1291         brelse(bh);
1292         return status;
1293 }
1294 
1295 int ocfs2_getattr(const struct path *path, struct kstat *stat,
1296                   u32 request_mask, unsigned int flags)
1297 {
1298         struct inode *inode = d_inode(path->dentry);
1299         struct super_block *sb = path->dentry->d_sb;
1300         struct ocfs2_super *osb = sb->s_fs_info;
1301         int err;
1302 
1303         err = ocfs2_inode_revalidate(path->dentry);
1304         if (err) {
1305                 if (err != -ENOENT)
1306                         mlog_errno(err);
1307                 goto bail;
1308         }
1309 
1310         generic_fillattr(inode, stat);
1311         /*
1312          * If there is inline data in the inode, the inode will normally not
1313          * have data blocks allocated (it may have an external xattr block).
1314          * Report at least one sector for such files, so tools like tar, rsync,
1315          * others don't incorrectly think the file is completely sparse.
1316          */
1317         if (unlikely(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1318                 stat->blocks += (stat->size + 511)>>9;
1319 
1320         /* We set the blksize from the cluster size for performance */
1321         stat->blksize = osb->s_clustersize;
1322 
1323 bail:
1324         return err;
1325 }
1326 
1327 int ocfs2_permission(struct inode *inode, int mask)
1328 {
1329         int ret, had_lock;
1330         struct ocfs2_lock_holder oh;
1331 
1332         if (mask & MAY_NOT_BLOCK)
1333                 return -ECHILD;
1334 
1335         had_lock = ocfs2_inode_lock_tracker(inode, NULL, 0, &oh);
1336         if (had_lock < 0) {
1337                 ret = had_lock;
1338                 goto out;
1339         } else if (had_lock) {
1340                 /* See comments in ocfs2_setattr() for details.
1341                  * The call chain of this case could be:
1342                  * do_sys_open()
1343                  *  may_open()
1344                  *   inode_permission()
1345                  *    ocfs2_permission()
1346                  *     ocfs2_iop_get_acl()
1347                  */
1348                 mlog(ML_ERROR, "Another case of recursive locking:\n");
1349                 dump_stack();
1350         }
1351 
1352         ret = generic_permission(inode, mask);
1353 
1354         ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock);
1355 out:
1356         return ret;
1357 }
1358 
1359 static int __ocfs2_write_remove_suid(struct inode *inode,
1360                                      struct buffer_head *bh)
1361 {
1362         int ret;
1363         handle_t *handle;
1364         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1365         struct ocfs2_dinode *di;
1366 
1367         trace_ocfs2_write_remove_suid(
1368                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1369                         inode->i_mode);
1370 
1371         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1372         if (IS_ERR(handle)) {
1373                 ret = PTR_ERR(handle);
1374                 mlog_errno(ret);
1375                 goto out;
1376         }
1377 
1378         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1379                                       OCFS2_JOURNAL_ACCESS_WRITE);
1380         if (ret < 0) {
1381                 mlog_errno(ret);
1382                 goto out_trans;
1383         }
1384 
1385         inode->i_mode &= ~S_ISUID;
1386         if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1387                 inode->i_mode &= ~S_ISGID;
1388 
1389         di = (struct ocfs2_dinode *) bh->b_data;
1390         di->i_mode = cpu_to_le16(inode->i_mode);
1391         ocfs2_update_inode_fsync_trans(handle, inode, 0);
1392 
1393         ocfs2_journal_dirty(handle, bh);
1394 
1395 out_trans:
1396         ocfs2_commit_trans(osb, handle);
1397 out:
1398         return ret;
1399 }
1400 
1401 static int ocfs2_write_remove_suid(struct inode *inode)
1402 {
1403         int ret;
1404         struct buffer_head *bh = NULL;
1405 
1406         ret = ocfs2_read_inode_block(inode, &bh);
1407         if (ret < 0) {
1408                 mlog_errno(ret);
1409                 goto out;
1410         }
1411 
1412         ret =  __ocfs2_write_remove_suid(inode, bh);
1413 out:
1414         brelse(bh);
1415         return ret;
1416 }
1417 
1418 /*
1419  * Allocate enough extents to cover the region starting at byte offset
1420  * start for len bytes. Existing extents are skipped, any extents
1421  * added are marked as "unwritten".
1422  */
1423 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1424                                             u64 start, u64 len)
1425 {
1426         int ret;
1427         u32 cpos, phys_cpos, clusters, alloc_size;
1428         u64 end = start + len;
1429         struct buffer_head *di_bh = NULL;
1430 
1431         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1432                 ret = ocfs2_read_inode_block(inode, &di_bh);
1433                 if (ret) {
1434                         mlog_errno(ret);
1435                         goto out;
1436                 }
1437 
1438                 /*
1439                  * Nothing to do if the requested reservation range
1440                  * fits within the inode.
1441                  */
1442                 if (ocfs2_size_fits_inline_data(di_bh, end))
1443                         goto out;
1444 
1445                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1446                 if (ret) {
1447                         mlog_errno(ret);
1448                         goto out;
1449                 }
1450         }
1451 
1452         /*
1453          * We consider both start and len to be inclusive.
1454          */
1455         cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1456         clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1457         clusters -= cpos;
1458 
1459         while (clusters) {
1460                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1461                                          &alloc_size, NULL);
1462                 if (ret) {
1463                         mlog_errno(ret);
1464                         goto out;
1465                 }
1466 
1467                 /*
1468                  * Hole or existing extent len can be arbitrary, so
1469                  * cap it to our own allocation request.
1470                  */
1471                 if (alloc_size > clusters)
1472                         alloc_size = clusters;
1473 
1474                 if (phys_cpos) {
1475                         /*
1476                          * We already have an allocation at this
1477                          * region so we can safely skip it.
1478                          */
1479                         goto next;
1480                 }
1481 
1482                 ret = ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1483                 if (ret) {
1484                         if (ret != -ENOSPC)
1485                                 mlog_errno(ret);
1486                         goto out;
1487                 }
1488 
1489 next:
1490                 cpos += alloc_size;
1491                 clusters -= alloc_size;
1492         }
1493 
1494         ret = 0;
1495 out:
1496 
1497         brelse(di_bh);
1498         return ret;
1499 }
1500 
1501 /*
1502  * Truncate a byte range, avoiding pages within partial clusters. This
1503  * preserves those pages for the zeroing code to write to.
1504  */
1505 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1506                                          u64 byte_len)
1507 {
1508         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1509         loff_t start, end;
1510         struct address_space *mapping = inode->i_mapping;
1511 
1512         start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1513         end = byte_start + byte_len;
1514         end = end & ~(osb->s_clustersize - 1);
1515 
1516         if (start < end) {
1517                 unmap_mapping_range(mapping, start, end - start, 0);
1518                 truncate_inode_pages_range(mapping, start, end - 1);
1519         }
1520 }
1521 
1522 static int ocfs2_zero_partial_clusters(struct inode *inode,
1523                                        u64 start, u64 len)
1524 {
1525         int ret = 0;
1526         u64 tmpend = 0;
1527         u64 end = start + len;
1528         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1529         unsigned int csize = osb->s_clustersize;
1530         handle_t *handle;
1531 
1532         /*
1533          * The "start" and "end" values are NOT necessarily part of
1534          * the range whose allocation is being deleted. Rather, this
1535          * is what the user passed in with the request. We must zero
1536          * partial clusters here. There's no need to worry about
1537          * physical allocation - the zeroing code knows to skip holes.
1538          */
1539         trace_ocfs2_zero_partial_clusters(
1540                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1541                 (unsigned long long)start, (unsigned long long)end);
1542 
1543         /*
1544          * If both edges are on a cluster boundary then there's no
1545          * zeroing required as the region is part of the allocation to
1546          * be truncated.
1547          */
1548         if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1549                 goto out;
1550 
1551         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1552         if (IS_ERR(handle)) {
1553                 ret = PTR_ERR(handle);
1554                 mlog_errno(ret);
1555                 goto out;
1556         }
1557 
1558         /*
1559          * If start is on a cluster boundary and end is somewhere in another
1560          * cluster, we have not COWed the cluster starting at start, unless
1561          * end is also within the same cluster. So, in this case, we skip this
1562          * first call to ocfs2_zero_range_for_truncate() truncate and move on
1563          * to the next one.
1564          */
1565         if ((start & (csize - 1)) != 0) {
1566                 /*
1567                  * We want to get the byte offset of the end of the 1st
1568                  * cluster.
1569                  */
1570                 tmpend = (u64)osb->s_clustersize +
1571                         (start & ~(osb->s_clustersize - 1));
1572                 if (tmpend > end)
1573                         tmpend = end;
1574 
1575                 trace_ocfs2_zero_partial_clusters_range1(
1576                         (unsigned long long)start,
1577                         (unsigned long long)tmpend);
1578 
1579                 ret = ocfs2_zero_range_for_truncate(inode, handle, start,
1580                                                     tmpend);
1581                 if (ret)
1582                         mlog_errno(ret);
1583         }
1584 
1585         if (tmpend < end) {
1586                 /*
1587                  * This may make start and end equal, but the zeroing
1588                  * code will skip any work in that case so there's no
1589                  * need to catch it up here.
1590                  */
1591                 start = end & ~(osb->s_clustersize - 1);
1592 
1593                 trace_ocfs2_zero_partial_clusters_range2(
1594                         (unsigned long long)start, (unsigned long long)end);
1595 
1596                 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1597                 if (ret)
1598                         mlog_errno(ret);
1599         }
1600         ocfs2_update_inode_fsync_trans(handle, inode, 1);
1601 
1602         ocfs2_commit_trans(osb, handle);
1603 out:
1604         return ret;
1605 }
1606 
1607 static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1608 {
1609         int i;
1610         struct ocfs2_extent_rec *rec = NULL;
1611 
1612         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1613 
1614                 rec = &el->l_recs[i];
1615 
1616                 if (le32_to_cpu(rec->e_cpos) < pos)
1617                         break;
1618         }
1619 
1620         return i;
1621 }
1622 
1623 /*
1624  * Helper to calculate the punching pos and length in one run, we handle the
1625  * following three cases in order:
1626  *
1627  * - remove the entire record
1628  * - remove a partial record
1629  * - no record needs to be removed (hole-punching completed)
1630 */
1631 static void ocfs2_calc_trunc_pos(struct inode *inode,
1632                                  struct ocfs2_extent_list *el,
1633                                  struct ocfs2_extent_rec *rec,
1634                                  u32 trunc_start, u32 *trunc_cpos,
1635                                  u32 *trunc_len, u32 *trunc_end,
1636                                  u64 *blkno, int *done)
1637 {
1638         int ret = 0;
1639         u32 coff, range;
1640 
1641         range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1642 
1643         if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1644                 /*
1645                  * remove an entire extent record.
1646                  */
1647                 *trunc_cpos = le32_to_cpu(rec->e_cpos);
1648                 /*
1649                  * Skip holes if any.
1650                  */
1651                 if (range < *trunc_end)
1652                         *trunc_end = range;
1653                 *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1654                 *blkno = le64_to_cpu(rec->e_blkno);
1655                 *trunc_end = le32_to_cpu(rec->e_cpos);
1656         } else if (range > trunc_start) {
1657                 /*
1658                  * remove a partial extent record, which means we're
1659                  * removing the last extent record.
1660                  */
1661                 *trunc_cpos = trunc_start;
1662                 /*
1663                  * skip hole if any.
1664                  */
1665                 if (range < *trunc_end)
1666                         *trunc_end = range;
1667                 *trunc_len = *trunc_end - trunc_start;
1668                 coff = trunc_start - le32_to_cpu(rec->e_cpos);
1669                 *blkno = le64_to_cpu(rec->e_blkno) +
1670                                 ocfs2_clusters_to_blocks(inode->i_sb, coff);
1671                 *trunc_end = trunc_start;
1672         } else {
1673                 /*
1674                  * It may have two following possibilities:
1675                  *
1676                  * - last record has been removed
1677                  * - trunc_start was within a hole
1678                  *
1679                  * both two cases mean the completion of hole punching.
1680                  */
1681                 ret = 1;
1682         }
1683 
1684         *done = ret;
1685 }
1686 
1687 int ocfs2_remove_inode_range(struct inode *inode,
1688                              struct buffer_head *di_bh, u64 byte_start,
1689                              u64 byte_len)
1690 {
1691         int ret = 0, flags = 0, done = 0, i;
1692         u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1693         u32 cluster_in_el;
1694         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1695         struct ocfs2_cached_dealloc_ctxt dealloc;
1696         struct address_space *mapping = inode->i_mapping;
1697         struct ocfs2_extent_tree et;
1698         struct ocfs2_path *path = NULL;
1699         struct ocfs2_extent_list *el = NULL;
1700         struct ocfs2_extent_rec *rec = NULL;
1701         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1702         u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1703 
1704         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1705         ocfs2_init_dealloc_ctxt(&dealloc);
1706 
1707         trace_ocfs2_remove_inode_range(
1708                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1709                         (unsigned long long)byte_start,
1710                         (unsigned long long)byte_len);
1711 
1712         if (byte_len == 0)
1713                 return 0;
1714 
1715         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1716                 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1717                                             byte_start + byte_len, 0);
1718                 if (ret) {
1719                         mlog_errno(ret);
1720                         goto out;
1721                 }
1722                 /*
1723                  * There's no need to get fancy with the page cache
1724                  * truncate of an inline-data inode. We're talking
1725                  * about less than a page here, which will be cached
1726                  * in the dinode buffer anyway.
1727                  */
1728                 unmap_mapping_range(mapping, 0, 0, 0);
1729                 truncate_inode_pages(mapping, 0);
1730                 goto out;
1731         }
1732 
1733         /*
1734          * For reflinks, we may need to CoW 2 clusters which might be
1735          * partially zero'd later, if hole's start and end offset were
1736          * within one cluster(means is not exactly aligned to clustersize).
1737          */
1738 
1739         if (ocfs2_is_refcount_inode(inode)) {
1740                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1741                 if (ret) {
1742                         mlog_errno(ret);
1743                         goto out;
1744                 }
1745 
1746                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1747                 if (ret) {
1748                         mlog_errno(ret);
1749                         goto out;
1750                 }
1751         }
1752 
1753         trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1754         trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1755         cluster_in_el = trunc_end;
1756 
1757         ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1758         if (ret) {
1759                 mlog_errno(ret);
1760                 goto out;
1761         }
1762 
1763         path = ocfs2_new_path_from_et(&et);
1764         if (!path) {
1765                 ret = -ENOMEM;
1766                 mlog_errno(ret);
1767                 goto out;
1768         }
1769 
1770         while (trunc_end > trunc_start) {
1771 
1772                 ret = ocfs2_find_path(INODE_CACHE(inode), path,
1773                                       cluster_in_el);
1774                 if (ret) {
1775                         mlog_errno(ret);
1776                         goto out;
1777                 }
1778 
1779                 el = path_leaf_el(path);
1780 
1781                 i = ocfs2_find_rec(el, trunc_end);
1782                 /*
1783                  * Need to go to previous extent block.
1784                  */
1785                 if (i < 0) {
1786                         if (path->p_tree_depth == 0)
1787                                 break;
1788 
1789                         ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1790                                                             path,
1791                                                             &cluster_in_el);
1792                         if (ret) {
1793                                 mlog_errno(ret);
1794                                 goto out;
1795                         }
1796 
1797                         /*
1798                          * We've reached the leftmost extent block,
1799                          * it's safe to leave.
1800                          */
1801                         if (cluster_in_el == 0)
1802                                 break;
1803 
1804                         /*
1805                          * The 'pos' searched for previous extent block is
1806                          * always one cluster less than actual trunc_end.
1807                          */
1808                         trunc_end = cluster_in_el + 1;
1809 
1810                         ocfs2_reinit_path(path, 1);
1811 
1812                         continue;
1813 
1814                 } else
1815                         rec = &el->l_recs[i];
1816 
1817                 ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1818                                      &trunc_len, &trunc_end, &blkno, &done);
1819                 if (done)
1820                         break;
1821 
1822                 flags = rec->e_flags;
1823                 phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1824 
1825                 ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1826                                                phys_cpos, trunc_len, flags,
1827                                                &dealloc, refcount_loc, false);
1828                 if (ret < 0) {
1829                         mlog_errno(ret);
1830                         goto out;
1831                 }
1832 
1833                 cluster_in_el = trunc_end;
1834 
1835                 ocfs2_reinit_path(path, 1);
1836         }
1837 
1838         ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1839 
1840 out:
1841         ocfs2_free_path(path);
1842         ocfs2_schedule_truncate_log_flush(osb, 1);
1843         ocfs2_run_deallocs(osb, &dealloc);
1844 
1845         return ret;
1846 }
1847 
1848 /*
1849  * Parts of this function taken from xfs_change_file_space()
1850  */
1851 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1852                                      loff_t f_pos, unsigned int cmd,
1853                                      struct ocfs2_space_resv *sr,
1854                                      int change_size)
1855 {
1856         int ret;
1857         s64 llen;
1858         loff_t size;
1859         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1860         struct buffer_head *di_bh = NULL;
1861         handle_t *handle;
1862         unsigned long long max_off = inode->i_sb->s_maxbytes;
1863 
1864         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1865                 return -EROFS;
1866 
1867         inode_lock(inode);
1868 
1869         /*
1870          * This prevents concurrent writes on other nodes
1871          */
1872         ret = ocfs2_rw_lock(inode, 1);
1873         if (ret) {
1874                 mlog_errno(ret);
1875                 goto out;
1876         }
1877 
1878         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1879         if (ret) {
1880                 mlog_errno(ret);
1881                 goto out_rw_unlock;
1882         }
1883 
1884         if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1885                 ret = -EPERM;
1886                 goto out_inode_unlock;
1887         }
1888 
1889         switch (sr->l_whence) {
1890         case 0: /*SEEK_SET*/
1891                 break;
1892         case 1: /*SEEK_CUR*/
1893                 sr->l_start += f_pos;
1894                 break;
1895         case 2: /*SEEK_END*/
1896                 sr->l_start += i_size_read(inode);
1897                 break;
1898         default:
1899                 ret = -EINVAL;
1900                 goto out_inode_unlock;
1901         }
1902         sr->l_whence = 0;
1903 
1904         llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1905 
1906         if (sr->l_start < 0
1907             || sr->l_start > max_off
1908             || (sr->l_start + llen) < 0
1909             || (sr->l_start + llen) > max_off) {
1910                 ret = -EINVAL;
1911                 goto out_inode_unlock;
1912         }
1913         size = sr->l_start + sr->l_len;
1914 
1915         if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64 ||
1916             cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) {
1917                 if (sr->l_len <= 0) {
1918                         ret = -EINVAL;
1919                         goto out_inode_unlock;
1920                 }
1921         }
1922 
1923         if (file && should_remove_suid(file->f_path.dentry)) {
1924                 ret = __ocfs2_write_remove_suid(inode, di_bh);
1925                 if (ret) {
1926                         mlog_errno(ret);
1927                         goto out_inode_unlock;
1928                 }
1929         }
1930 
1931         down_write(&OCFS2_I(inode)->ip_alloc_sem);
1932         switch (cmd) {
1933         case OCFS2_IOC_RESVSP:
1934         case OCFS2_IOC_RESVSP64:
1935                 /*
1936                  * This takes unsigned offsets, but the signed ones we
1937                  * pass have been checked against overflow above.
1938                  */
1939                 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1940                                                        sr->l_len);
1941                 break;
1942         case OCFS2_IOC_UNRESVSP:
1943         case OCFS2_IOC_UNRESVSP64:
1944                 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1945                                                sr->l_len);
1946                 break;
1947         default:
1948                 ret = -EINVAL;
1949         }
1950         up_write(&OCFS2_I(inode)->ip_alloc_sem);
1951         if (ret) {
1952                 mlog_errno(ret);
1953                 goto out_inode_unlock;
1954         }
1955 
1956         /*
1957          * We update c/mtime for these changes
1958          */
1959         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1960         if (IS_ERR(handle)) {
1961                 ret = PTR_ERR(handle);
1962                 mlog_errno(ret);
1963                 goto out_inode_unlock;
1964         }
1965 
1966         if (change_size && i_size_read(inode) < size)
1967                 i_size_write(inode, size);
1968 
1969         inode->i_ctime = inode->i_mtime = current_time(inode);
1970         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1971         if (ret < 0)
1972                 mlog_errno(ret);
1973 
1974         if (file && (file->f_flags & O_SYNC))
1975                 handle->h_sync = 1;
1976 
1977         ocfs2_commit_trans(osb, handle);
1978 
1979 out_inode_unlock:
1980         brelse(di_bh);
1981         ocfs2_inode_unlock(inode, 1);
1982 out_rw_unlock:
1983         ocfs2_rw_unlock(inode, 1);
1984 
1985 out:
1986         inode_unlock(inode);
1987         return ret;
1988 }
1989 
1990 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1991                             struct ocfs2_space_resv *sr)
1992 {
1993         struct inode *inode = file_inode(file);
1994         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1995         int ret;
1996 
1997         if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1998             !ocfs2_writes_unwritten_extents(osb))
1999                 return -ENOTTY;
2000         else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
2001                  !ocfs2_sparse_alloc(osb))
2002                 return -ENOTTY;
2003 
2004         if (!S_ISREG(inode->i_mode))
2005                 return -EINVAL;
2006 
2007         if (!(file->f_mode & FMODE_WRITE))
2008                 return -EBADF;
2009 
2010         ret = mnt_want_write_file(file);
2011         if (ret)
2012                 return ret;
2013         ret = __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
2014         mnt_drop_write_file(file);
2015         return ret;
2016 }
2017 
2018 static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
2019                             loff_t len)
2020 {
2021         struct inode *inode = file_inode(file);
2022         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2023         struct ocfs2_space_resv sr;
2024         int change_size = 1;
2025         int cmd = OCFS2_IOC_RESVSP64;
2026 
2027         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2028                 return -EOPNOTSUPP;
2029         if (!ocfs2_writes_unwritten_extents(osb))
2030                 return -EOPNOTSUPP;
2031 
2032         if (mode & FALLOC_FL_KEEP_SIZE)
2033                 change_size = 0;
2034 
2035         if (mode & FALLOC_FL_PUNCH_HOLE)
2036                 cmd = OCFS2_IOC_UNRESVSP64;
2037 
2038         sr.l_whence = 0;
2039         sr.l_start = (s64)offset;
2040         sr.l_len = (s64)len;
2041 
2042         return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
2043                                          change_size);
2044 }
2045 
2046 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2047                                    size_t count)
2048 {
2049         int ret = 0;
2050         unsigned int extent_flags;
2051         u32 cpos, clusters, extent_len, phys_cpos;
2052         struct super_block *sb = inode->i_sb;
2053 
2054         if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2055             !ocfs2_is_refcount_inode(inode) ||
2056             OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2057                 return 0;
2058 
2059         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2060         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2061 
2062         while (clusters) {
2063                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2064                                          &extent_flags);
2065                 if (ret < 0) {
2066                         mlog_errno(ret);
2067                         goto out;
2068                 }
2069 
2070                 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2071                         ret = 1;
2072                         break;
2073                 }
2074 
2075                 if (extent_len > clusters)
2076                         extent_len = clusters;
2077 
2078                 clusters -= extent_len;
2079                 cpos += extent_len;
2080         }
2081 out:
2082         return ret;
2083 }
2084 
2085 static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
2086 {
2087         int blockmask = inode->i_sb->s_blocksize - 1;
2088         loff_t final_size = pos + count;
2089 
2090         if ((pos & blockmask) || (final_size & blockmask))
2091                 return 1;
2092         return 0;
2093 }
2094 
2095 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
2096                                             struct file *file,
2097                                             loff_t pos, size_t count,
2098                                             int *meta_level)
2099 {
2100         int ret;
2101         struct buffer_head *di_bh = NULL;
2102         u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2103         u32 clusters =
2104                 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2105 
2106         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2107         if (ret) {
2108                 mlog_errno(ret);
2109                 goto out;
2110         }
2111 
2112         *meta_level = 1;
2113 
2114         ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
2115         if (ret)
2116                 mlog_errno(ret);
2117 out:
2118         brelse(di_bh);
2119         return ret;
2120 }
2121 
2122 static int ocfs2_prepare_inode_for_write(struct file *file,
2123                                          loff_t pos, size_t count, int wait)
2124 {
2125         int ret = 0, meta_level = 0, overwrite_io = 0;
2126         struct dentry *dentry = file->f_path.dentry;
2127         struct inode *inode = d_inode(dentry);
2128         struct buffer_head *di_bh = NULL;
2129         loff_t end;
2130 
2131         /*
2132          * We start with a read level meta lock and only jump to an ex
2133          * if we need to make modifications here.
2134          */
2135         for(;;) {
2136                 if (wait)
2137                         ret = ocfs2_inode_lock(inode, NULL, meta_level);
2138                 else
2139                         ret = ocfs2_try_inode_lock(inode,
2140                                 overwrite_io ? NULL : &di_bh, meta_level);
2141                 if (ret < 0) {
2142                         meta_level = -1;
2143                         if (ret != -EAGAIN)
2144                                 mlog_errno(ret);
2145                         goto out;
2146                 }
2147 
2148                 /*
2149                  * Check if IO will overwrite allocated blocks in case
2150                  * IOCB_NOWAIT flag is set.
2151                  */
2152                 if (!wait && !overwrite_io) {
2153                         overwrite_io = 1;
2154                         if (!down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem)) {
2155                                 ret = -EAGAIN;
2156                                 goto out_unlock;
2157                         }
2158 
2159                         ret = ocfs2_overwrite_io(inode, di_bh, pos, count);
2160                         brelse(di_bh);
2161                         di_bh = NULL;
2162                         up_read(&OCFS2_I(inode)->ip_alloc_sem);
2163                         if (ret < 0) {
2164                                 if (ret != -EAGAIN)
2165                                         mlog_errno(ret);
2166                                 goto out_unlock;
2167                         }
2168                 }
2169 
2170                 /* Clear suid / sgid if necessary. We do this here
2171                  * instead of later in the write path because
2172                  * remove_suid() calls ->setattr without any hint that
2173                  * we may have already done our cluster locking. Since
2174                  * ocfs2_setattr() *must* take cluster locks to
2175                  * proceed, this will lead us to recursively lock the
2176                  * inode. There's also the dinode i_size state which
2177                  * can be lost via setattr during extending writes (we
2178                  * set inode->i_size at the end of a write. */
2179                 if (should_remove_suid(dentry)) {
2180                         if (meta_level == 0) {
2181                                 ocfs2_inode_unlock(inode, meta_level);
2182                                 meta_level = 1;
2183                                 continue;
2184                         }
2185 
2186                         ret = ocfs2_write_remove_suid(inode);
2187                         if (ret < 0) {
2188                                 mlog_errno(ret);
2189                                 goto out_unlock;
2190                         }
2191                 }
2192 
2193                 end = pos + count;
2194 
2195                 ret = ocfs2_check_range_for_refcount(inode, pos, count);
2196                 if (ret == 1) {
2197                         ocfs2_inode_unlock(inode, meta_level);
2198                         meta_level = -1;
2199 
2200                         ret = ocfs2_prepare_inode_for_refcount(inode,
2201                                                                file,
2202                                                                pos,
2203                                                                count,
2204                                                                &meta_level);
2205                 }
2206 
2207                 if (ret < 0) {
2208                         mlog_errno(ret);
2209                         goto out_unlock;
2210                 }
2211 
2212                 break;
2213         }
2214 
2215 out_unlock:
2216         trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
2217                                             pos, count, wait);
2218 
2219         brelse(di_bh);
2220 
2221         if (meta_level >= 0)
2222                 ocfs2_inode_unlock(inode, meta_level);
2223 
2224 out:
2225         return ret;
2226 }
2227 
2228 static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
2229                                     struct iov_iter *from)
2230 {
2231         int rw_level;
2232         ssize_t written = 0;
2233         ssize_t ret;
2234         size_t count = iov_iter_count(from);
2235         struct file *file = iocb->ki_filp;
2236         struct inode *inode = file_inode(file);
2237         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2238         int full_coherency = !(osb->s_mount_opt &
2239                                OCFS2_MOUNT_COHERENCY_BUFFERED);
2240         void *saved_ki_complete = NULL;
2241         int append_write = ((iocb->ki_pos + count) >=
2242                         i_size_read(inode) ? 1 : 0);
2243         int direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
2244         int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
2245 
2246         trace_ocfs2_file_write_iter(inode, file, file->f_path.dentry,
2247                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
2248                 file->f_path.dentry->d_name.len,
2249                 file->f_path.dentry->d_name.name,
2250                 (unsigned int)from->nr_segs);   /* GRRRRR */
2251 
2252         if (!direct_io && nowait)
2253                 return -EOPNOTSUPP;
2254 
2255         if (count == 0)
2256                 return 0;
2257 
2258         if (nowait) {
2259                 if (!inode_trylock(inode))
2260                         return -EAGAIN;
2261         } else
2262                 inode_lock(inode);
2263 
2264         /*
2265          * Concurrent O_DIRECT writes are allowed with
2266          * mount_option "coherency=buffered".
2267          * For append write, we must take rw EX.
2268          */
2269         rw_level = (!direct_io || full_coherency || append_write);
2270 
2271         if (nowait)
2272                 ret = ocfs2_try_rw_lock(inode, rw_level);
2273         else
2274                 ret = ocfs2_rw_lock(inode, rw_level);
2275         if (ret < 0) {
2276                 if (ret != -EAGAIN)
2277                         mlog_errno(ret);
2278                 goto out_mutex;
2279         }
2280 
2281         /*
2282          * O_DIRECT writes with "coherency=full" need to take EX cluster
2283          * inode_lock to guarantee coherency.
2284          */
2285         if (direct_io && full_coherency) {
2286                 /*
2287                  * We need to take and drop the inode lock to force
2288                  * other nodes to drop their caches.  Buffered I/O
2289                  * already does this in write_begin().
2290                  */
2291                 if (nowait)
2292                         ret = ocfs2_try_inode_lock(inode, NULL, 1);
2293                 else
2294                         ret = ocfs2_inode_lock(inode, NULL, 1);
2295                 if (ret < 0) {
2296                         if (ret != -EAGAIN)
2297                                 mlog_errno(ret);
2298                         goto out;
2299                 }
2300 
2301                 ocfs2_inode_unlock(inode, 1);
2302         }
2303 
2304         ret = generic_write_checks(iocb, from);
2305         if (ret <= 0) {
2306                 if (ret)
2307                         mlog_errno(ret);
2308                 goto out;
2309         }
2310         count = ret;
2311 
2312         ret = ocfs2_prepare_inode_for_write(file, iocb->ki_pos, count, !nowait);
2313         if (ret < 0) {
2314                 if (ret != -EAGAIN)
2315                         mlog_errno(ret);
2316                 goto out;
2317         }
2318 
2319         if (direct_io && !is_sync_kiocb(iocb) &&
2320             ocfs2_is_io_unaligned(inode, count, iocb->ki_pos)) {
2321                 /*
2322                  * Make it a sync io if it's an unaligned aio.
2323                  */
2324                 saved_ki_complete = xchg(&iocb->ki_complete, NULL);
2325         }
2326 
2327         /* communicate with ocfs2_dio_end_io */
2328         ocfs2_iocb_set_rw_locked(iocb, rw_level);
2329 
2330         written = __generic_file_write_iter(iocb, from);
2331         /* buffered aio wouldn't have proper lock coverage today */
2332         BUG_ON(written == -EIOCBQUEUED && !direct_io);
2333 
2334         /*
2335          * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2336          * function pointer which is called when o_direct io completes so that
2337          * it can unlock our rw lock.
2338          * Unfortunately there are error cases which call end_io and others
2339          * that don't.  so we don't have to unlock the rw_lock if either an
2340          * async dio is going to do it in the future or an end_io after an
2341          * error has already done it.
2342          */
2343         if ((written == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2344                 rw_level = -1;
2345         }
2346 
2347         if (unlikely(written <= 0))
2348                 goto out;
2349 
2350         if (((file->f_flags & O_DSYNC) && !direct_io) ||
2351             IS_SYNC(inode)) {
2352                 ret = filemap_fdatawrite_range(file->f_mapping,
2353                                                iocb->ki_pos - written,
2354                                                iocb->ki_pos - 1);
2355                 if (ret < 0)
2356                         written = ret;
2357 
2358                 if (!ret) {
2359                         ret = jbd2_journal_force_commit(osb->journal->j_journal);
2360                         if (ret < 0)
2361                                 written = ret;
2362                 }
2363 
2364                 if (!ret)
2365                         ret = filemap_fdatawait_range(file->f_mapping,
2366                                                       iocb->ki_pos - written,
2367                                                       iocb->ki_pos - 1);
2368         }
2369 
2370 out:
2371         if (saved_ki_complete)
2372                 xchg(&iocb->ki_complete, saved_ki_complete);
2373 
2374         if (rw_level != -1)
2375                 ocfs2_rw_unlock(inode, rw_level);
2376 
2377 out_mutex:
2378         inode_unlock(inode);
2379 
2380         if (written)
2381                 ret = written;
2382         return ret;
2383 }
2384 
2385 static ssize_t ocfs2_file_read_iter(struct kiocb *iocb,
2386                                    struct iov_iter *to)
2387 {
2388         int ret = 0, rw_level = -1, lock_level = 0;
2389         struct file *filp = iocb->ki_filp;
2390         struct inode *inode = file_inode(filp);
2391         int direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
2392         int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
2393 
2394         trace_ocfs2_file_read_iter(inode, filp, filp->f_path.dentry,
2395                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2396                         filp->f_path.dentry->d_name.len,
2397                         filp->f_path.dentry->d_name.name,
2398                         to->nr_segs);   /* GRRRRR */
2399 
2400 
2401         if (!inode) {
2402                 ret = -EINVAL;
2403                 mlog_errno(ret);
2404                 goto bail;
2405         }
2406 
2407         if (!direct_io && nowait)
2408                 return -EOPNOTSUPP;
2409 
2410         /*
2411          * buffered reads protect themselves in ->readpage().  O_DIRECT reads
2412          * need locks to protect pending reads from racing with truncate.
2413          */
2414         if (direct_io) {
2415                 if (nowait)
2416                         ret = ocfs2_try_rw_lock(inode, 0);
2417                 else
2418                         ret = ocfs2_rw_lock(inode, 0);
2419 
2420                 if (ret < 0) {
2421                         if (ret != -EAGAIN)
2422                                 mlog_errno(ret);
2423                         goto bail;
2424                 }
2425                 rw_level = 0;
2426                 /* communicate with ocfs2_dio_end_io */
2427                 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2428         }
2429 
2430         /*
2431          * We're fine letting folks race truncates and extending
2432          * writes with read across the cluster, just like they can
2433          * locally. Hence no rw_lock during read.
2434          *
2435          * Take and drop the meta data lock to update inode fields
2436          * like i_size. This allows the checks down below
2437          * generic_file_read_iter() a chance of actually working.
2438          */
2439         ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level,
2440                                      !nowait);
2441         if (ret < 0) {
2442                 if (ret != -EAGAIN)
2443                         mlog_errno(ret);
2444                 goto bail;
2445         }
2446         ocfs2_inode_unlock(inode, lock_level);
2447 
2448         ret = generic_file_read_iter(iocb, to);
2449         trace_generic_file_read_iter_ret(ret);
2450 
2451         /* buffered aio wouldn't have proper lock coverage today */
2452         BUG_ON(ret == -EIOCBQUEUED && !direct_io);
2453 
2454         /* see ocfs2_file_write_iter */
2455         if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2456                 rw_level = -1;
2457         }
2458 
2459 bail:
2460         if (rw_level != -1)
2461                 ocfs2_rw_unlock(inode, rw_level);
2462 
2463         return ret;
2464 }
2465 
2466 /* Refer generic_file_llseek_unlocked() */
2467 static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int whence)
2468 {
2469         struct inode *inode = file->f_mapping->host;
2470         int ret = 0;
2471 
2472         inode_lock(inode);
2473 
2474         switch (whence) {
2475         case SEEK_SET:
2476                 break;
2477         case SEEK_END:
2478                 /* SEEK_END requires the OCFS2 inode lock for the file
2479                  * because it references the file's size.
2480                  */
2481                 ret = ocfs2_inode_lock(inode, NULL, 0);
2482                 if (ret < 0) {
2483                         mlog_errno(ret);
2484                         goto out;
2485                 }
2486                 offset += i_size_read(inode);
2487                 ocfs2_inode_unlock(inode, 0);
2488                 break;
2489         case SEEK_CUR:
2490                 if (offset == 0) {
2491                         offset = file->f_pos;
2492                         goto out;
2493                 }
2494                 offset += file->f_pos;
2495                 break;
2496         case SEEK_DATA:
2497         case SEEK_HOLE:
2498                 ret = ocfs2_seek_data_hole_offset(file, &offset, whence);
2499                 if (ret)
2500                         goto out;
2501                 break;
2502         default:
2503                 ret = -EINVAL;
2504                 goto out;
2505         }
2506 
2507         offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
2508 
2509 out:
2510         inode_unlock(inode);
2511         if (ret)
2512                 return ret;
2513         return offset;
2514 }
2515 
2516 static loff_t ocfs2_remap_file_range(struct file *file_in, loff_t pos_in,
2517                                      struct file *file_out, loff_t pos_out,
2518                                      loff_t len, unsigned int remap_flags)
2519 {
2520         struct inode *inode_in = file_inode(file_in);
2521         struct inode *inode_out = file_inode(file_out);
2522         struct ocfs2_super *osb = OCFS2_SB(inode_in->i_sb);
2523         struct buffer_head *in_bh = NULL, *out_bh = NULL;
2524         bool same_inode = (inode_in == inode_out);
2525         loff_t remapped = 0;
2526         ssize_t ret;
2527 
2528         if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
2529                 return -EINVAL;
2530         if (!ocfs2_refcount_tree(osb))
2531                 return -EOPNOTSUPP;
2532         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
2533                 return -EROFS;
2534 
2535         /* Lock both files against IO */
2536         ret = ocfs2_reflink_inodes_lock(inode_in, &in_bh, inode_out, &out_bh);
2537         if (ret)
2538                 return ret;
2539 
2540         /* Check file eligibility and prepare for block sharing. */
2541         ret = -EINVAL;
2542         if ((OCFS2_I(inode_in)->ip_flags & OCFS2_INODE_SYSTEM_FILE) ||
2543             (OCFS2_I(inode_out)->ip_flags & OCFS2_INODE_SYSTEM_FILE))
2544                 goto out_unlock;
2545 
2546         ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out,
2547                         &len, remap_flags);
2548         if (ret < 0 || len == 0)
2549                 goto out_unlock;
2550 
2551         /* Lock out changes to the allocation maps and remap. */
2552         down_write(&OCFS2_I(inode_in)->ip_alloc_sem);
2553         if (!same_inode)
2554                 down_write_nested(&OCFS2_I(inode_out)->ip_alloc_sem,
2555                                   SINGLE_DEPTH_NESTING);
2556 
2557         /* Zap any page cache for the destination file's range. */
2558         truncate_inode_pages_range(&inode_out->i_data,
2559                                    round_down(pos_out, PAGE_SIZE),
2560                                    round_up(pos_out + len, PAGE_SIZE) - 1);
2561 
2562         remapped = ocfs2_reflink_remap_blocks(inode_in, in_bh, pos_in,
2563                         inode_out, out_bh, pos_out, len);
2564         up_write(&OCFS2_I(inode_in)->ip_alloc_sem);
2565         if (!same_inode)
2566                 up_write(&OCFS2_I(inode_out)->ip_alloc_sem);
2567         if (remapped < 0) {
2568                 ret = remapped;
2569                 mlog_errno(ret);
2570                 goto out_unlock;
2571         }
2572 
2573         /*
2574          * Empty the extent map so that we may get the right extent
2575          * record from the disk.
2576          */
2577         ocfs2_extent_map_trunc(inode_in, 0);
2578         ocfs2_extent_map_trunc(inode_out, 0);
2579 
2580         ret = ocfs2_reflink_update_dest(inode_out, out_bh, pos_out + len);
2581         if (ret) {
2582                 mlog_errno(ret);
2583                 goto out_unlock;
2584         }
2585 
2586 out_unlock:
2587         ocfs2_reflink_inodes_unlock(inode_in, in_bh, inode_out, out_bh);
2588         return remapped > 0 ? remapped : ret;
2589 }
2590 
2591 const struct inode_operations ocfs2_file_iops = {
2592         .setattr        = ocfs2_setattr,
2593         .getattr        = ocfs2_getattr,
2594         .permission     = ocfs2_permission,
2595         .listxattr      = ocfs2_listxattr,
2596         .fiemap         = ocfs2_fiemap,
2597         .get_acl        = ocfs2_iop_get_acl,
2598         .set_acl        = ocfs2_iop_set_acl,
2599 };
2600 
2601 const struct inode_operations ocfs2_special_file_iops = {
2602         .setattr        = ocfs2_setattr,
2603         .getattr        = ocfs2_getattr,
2604         .permission     = ocfs2_permission,
2605         .get_acl        = ocfs2_iop_get_acl,
2606         .set_acl        = ocfs2_iop_set_acl,
2607 };
2608 
2609 /*
2610  * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2611  * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2612  */
2613 const struct file_operations ocfs2_fops = {
2614         .llseek         = ocfs2_file_llseek,
2615         .mmap           = ocfs2_mmap,
2616         .fsync          = ocfs2_sync_file,
2617         .release        = ocfs2_file_release,
2618         .open           = ocfs2_file_open,
2619         .read_iter      = ocfs2_file_read_iter,
2620         .write_iter     = ocfs2_file_write_iter,
2621         .unlocked_ioctl = ocfs2_ioctl,
2622 #ifdef CONFIG_COMPAT
2623         .compat_ioctl   = ocfs2_compat_ioctl,
2624 #endif
2625         .lock           = ocfs2_lock,
2626         .flock          = ocfs2_flock,
2627         .splice_read    = generic_file_splice_read,
2628         .splice_write   = iter_file_splice_write,
2629         .fallocate      = ocfs2_fallocate,
2630         .remap_file_range = ocfs2_remap_file_range,
2631 };
2632 
2633 const struct file_operations ocfs2_dops = {
2634         .llseek         = generic_file_llseek,
2635         .read           = generic_read_dir,
2636         .iterate        = ocfs2_readdir,
2637         .fsync          = ocfs2_sync_file,
2638         .release        = ocfs2_dir_release,
2639         .open           = ocfs2_dir_open,
2640         .unlocked_ioctl = ocfs2_ioctl,
2641 #ifdef CONFIG_COMPAT
2642         .compat_ioctl   = ocfs2_compat_ioctl,
2643 #endif
2644         .lock           = ocfs2_lock,
2645         .flock          = ocfs2_flock,
2646 };
2647 
2648 /*
2649  * POSIX-lockless variants of our file_operations.
2650  *
2651  * These will be used if the underlying cluster stack does not support
2652  * posix file locking, if the user passes the "localflocks" mount
2653  * option, or if we have a local-only fs.
2654  *
2655  * ocfs2_flock is in here because all stacks handle UNIX file locks,
2656  * so we still want it in the case of no stack support for
2657  * plocks. Internally, it will do the right thing when asked to ignore
2658  * the cluster.
2659  */
2660 const struct file_operations ocfs2_fops_no_plocks = {
2661         .llseek         = ocfs2_file_llseek,
2662         .mmap           = ocfs2_mmap,
2663         .fsync          = ocfs2_sync_file,
2664         .release        = ocfs2_file_release,
2665         .open           = ocfs2_file_open,
2666         .read_iter      = ocfs2_file_read_iter,
2667         .write_iter     = ocfs2_file_write_iter,
2668         .unlocked_ioctl = ocfs2_ioctl,
2669 #ifdef CONFIG_COMPAT
2670         .compat_ioctl   = ocfs2_compat_ioctl,
2671 #endif
2672         .flock          = ocfs2_flock,
2673         .splice_read    = generic_file_splice_read,
2674         .splice_write   = iter_file_splice_write,
2675         .fallocate      = ocfs2_fallocate,
2676         .remap_file_range = ocfs2_remap_file_range,
2677 };
2678 
2679 const struct file_operations ocfs2_dops_no_plocks = {
2680         .llseek         = generic_file_llseek,
2681         .read           = generic_read_dir,
2682         .iterate        = ocfs2_readdir,
2683         .fsync          = ocfs2_sync_file,
2684         .release        = ocfs2_dir_release,
2685         .open           = ocfs2_dir_open,
2686         .unlocked_ioctl = ocfs2_ioctl,
2687 #ifdef CONFIG_COMPAT
2688         .compat_ioctl   = ocfs2_compat_ioctl,
2689 #endif
2690         .flock          = ocfs2_flock,
2691 };
2692 

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