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TOMOYO Linux Cross Reference
Linux/fs/ocfs2/file.c

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  1 /* -*- mode: c; c-basic-offset: 8; -*-
  2  * vim: noexpandtab sw=8 ts=8 sts=0:
  3  *
  4  * file.c
  5  *
  6  * File open, close, extend, truncate
  7  *
  8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
  9  *
 10  * This program is free software; you can redistribute it and/or
 11  * modify it under the terms of the GNU General Public
 12  * License as published by the Free Software Foundation; either
 13  * version 2 of the License, or (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18  * General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public
 21  * License along with this program; if not, write to the
 22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 23  * Boston, MA 021110-1307, USA.
 24  */
 25 
 26 #include <linux/capability.h>
 27 #include <linux/fs.h>
 28 #include <linux/types.h>
 29 #include <linux/slab.h>
 30 #include <linux/highmem.h>
 31 #include <linux/pagemap.h>
 32 #include <linux/uio.h>
 33 #include <linux/sched.h>
 34 #include <linux/splice.h>
 35 #include <linux/mount.h>
 36 #include <linux/writeback.h>
 37 #include <linux/falloc.h>
 38 #include <linux/quotaops.h>
 39 #include <linux/blkdev.h>
 40 #include <linux/backing-dev.h>
 41 
 42 #include <cluster/masklog.h>
 43 
 44 #include "ocfs2.h"
 45 
 46 #include "alloc.h"
 47 #include "aops.h"
 48 #include "dir.h"
 49 #include "dlmglue.h"
 50 #include "extent_map.h"
 51 #include "file.h"
 52 #include "sysfile.h"
 53 #include "inode.h"
 54 #include "ioctl.h"
 55 #include "journal.h"
 56 #include "locks.h"
 57 #include "mmap.h"
 58 #include "suballoc.h"
 59 #include "super.h"
 60 #include "xattr.h"
 61 #include "acl.h"
 62 #include "quota.h"
 63 #include "refcounttree.h"
 64 #include "ocfs2_trace.h"
 65 
 66 #include "buffer_head_io.h"
 67 
 68 static int ocfs2_init_file_private(struct inode *inode, struct file *file)
 69 {
 70         struct ocfs2_file_private *fp;
 71 
 72         fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
 73         if (!fp)
 74                 return -ENOMEM;
 75 
 76         fp->fp_file = file;
 77         mutex_init(&fp->fp_mutex);
 78         ocfs2_file_lock_res_init(&fp->fp_flock, fp);
 79         file->private_data = fp;
 80 
 81         return 0;
 82 }
 83 
 84 static void ocfs2_free_file_private(struct inode *inode, struct file *file)
 85 {
 86         struct ocfs2_file_private *fp = file->private_data;
 87         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 88 
 89         if (fp) {
 90                 ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
 91                 ocfs2_lock_res_free(&fp->fp_flock);
 92                 kfree(fp);
 93                 file->private_data = NULL;
 94         }
 95 }
 96 
 97 static int ocfs2_file_open(struct inode *inode, struct file *file)
 98 {
 99         int status;
100         int mode = file->f_flags;
101         struct ocfs2_inode_info *oi = OCFS2_I(inode);
102 
103         trace_ocfs2_file_open(inode, file, file->f_path.dentry,
104                               (unsigned long long)oi->ip_blkno,
105                               file->f_path.dentry->d_name.len,
106                               file->f_path.dentry->d_name.name, mode);
107 
108         if (file->f_mode & FMODE_WRITE) {
109                 status = dquot_initialize(inode);
110                 if (status)
111                         goto leave;
112         }
113 
114         spin_lock(&oi->ip_lock);
115 
116         /* Check that the inode hasn't been wiped from disk by another
117          * node. If it hasn't then we're safe as long as we hold the
118          * spin lock until our increment of open count. */
119         if (oi->ip_flags & OCFS2_INODE_DELETED) {
120                 spin_unlock(&oi->ip_lock);
121 
122                 status = -ENOENT;
123                 goto leave;
124         }
125 
126         if (mode & O_DIRECT)
127                 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
128 
129         oi->ip_open_count++;
130         spin_unlock(&oi->ip_lock);
131 
132         status = ocfs2_init_file_private(inode, file);
133         if (status) {
134                 /*
135                  * We want to set open count back if we're failing the
136                  * open.
137                  */
138                 spin_lock(&oi->ip_lock);
139                 oi->ip_open_count--;
140                 spin_unlock(&oi->ip_lock);
141         }
142 
143         file->f_mode |= FMODE_NOWAIT;
144 
145 leave:
146         return status;
147 }
148 
149 static int ocfs2_file_release(struct inode *inode, struct file *file)
150 {
151         struct ocfs2_inode_info *oi = OCFS2_I(inode);
152 
153         spin_lock(&oi->ip_lock);
154         if (!--oi->ip_open_count)
155                 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
156 
157         trace_ocfs2_file_release(inode, file, file->f_path.dentry,
158                                  oi->ip_blkno,
159                                  file->f_path.dentry->d_name.len,
160                                  file->f_path.dentry->d_name.name,
161                                  oi->ip_open_count);
162         spin_unlock(&oi->ip_lock);
163 
164         ocfs2_free_file_private(inode, file);
165 
166         return 0;
167 }
168 
169 static int ocfs2_dir_open(struct inode *inode, struct file *file)
170 {
171         return ocfs2_init_file_private(inode, file);
172 }
173 
174 static int ocfs2_dir_release(struct inode *inode, struct file *file)
175 {
176         ocfs2_free_file_private(inode, file);
177         return 0;
178 }
179 
180 static int ocfs2_sync_file(struct file *file, loff_t start, loff_t end,
181                            int datasync)
182 {
183         int err = 0;
184         struct inode *inode = file->f_mapping->host;
185         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
186         struct ocfs2_inode_info *oi = OCFS2_I(inode);
187         journal_t *journal = osb->journal->j_journal;
188         int ret;
189         tid_t commit_tid;
190         bool needs_barrier = false;
191 
192         trace_ocfs2_sync_file(inode, file, file->f_path.dentry,
193                               oi->ip_blkno,
194                               file->f_path.dentry->d_name.len,
195                               file->f_path.dentry->d_name.name,
196                               (unsigned long long)datasync);
197 
198         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
199                 return -EROFS;
200 
201         err = file_write_and_wait_range(file, start, end);
202         if (err)
203                 return err;
204 
205         commit_tid = datasync ? oi->i_datasync_tid : oi->i_sync_tid;
206         if (journal->j_flags & JBD2_BARRIER &&
207             !jbd2_trans_will_send_data_barrier(journal, commit_tid))
208                 needs_barrier = true;
209         err = jbd2_complete_transaction(journal, commit_tid);
210         if (needs_barrier) {
211                 ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
212                 if (!err)
213                         err = ret;
214         }
215 
216         if (err)
217                 mlog_errno(err);
218 
219         return (err < 0) ? -EIO : 0;
220 }
221 
222 int ocfs2_should_update_atime(struct inode *inode,
223                               struct vfsmount *vfsmnt)
224 {
225         struct timespec64 now;
226         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
227 
228         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
229                 return 0;
230 
231         if ((inode->i_flags & S_NOATIME) ||
232             ((inode->i_sb->s_flags & SB_NODIRATIME) && S_ISDIR(inode->i_mode)))
233                 return 0;
234 
235         /*
236          * We can be called with no vfsmnt structure - NFSD will
237          * sometimes do this.
238          *
239          * Note that our action here is different than touch_atime() -
240          * if we can't tell whether this is a noatime mount, then we
241          * don't know whether to trust the value of s_atime_quantum.
242          */
243         if (vfsmnt == NULL)
244                 return 0;
245 
246         if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
247             ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
248                 return 0;
249 
250         if (vfsmnt->mnt_flags & MNT_RELATIME) {
251                 if ((timespec64_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
252                     (timespec64_compare(&inode->i_atime, &inode->i_ctime) <= 0))
253                         return 1;
254 
255                 return 0;
256         }
257 
258         now = current_time(inode);
259         if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
260                 return 0;
261         else
262                 return 1;
263 }
264 
265 int ocfs2_update_inode_atime(struct inode *inode,
266                              struct buffer_head *bh)
267 {
268         int ret;
269         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
270         handle_t *handle;
271         struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
272 
273         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
274         if (IS_ERR(handle)) {
275                 ret = PTR_ERR(handle);
276                 mlog_errno(ret);
277                 goto out;
278         }
279 
280         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
281                                       OCFS2_JOURNAL_ACCESS_WRITE);
282         if (ret) {
283                 mlog_errno(ret);
284                 goto out_commit;
285         }
286 
287         /*
288          * Don't use ocfs2_mark_inode_dirty() here as we don't always
289          * have i_mutex to guard against concurrent changes to other
290          * inode fields.
291          */
292         inode->i_atime = current_time(inode);
293         di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
294         di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
295         ocfs2_update_inode_fsync_trans(handle, inode, 0);
296         ocfs2_journal_dirty(handle, bh);
297 
298 out_commit:
299         ocfs2_commit_trans(osb, handle);
300 out:
301         return ret;
302 }
303 
304 int ocfs2_set_inode_size(handle_t *handle,
305                                 struct inode *inode,
306                                 struct buffer_head *fe_bh,
307                                 u64 new_i_size)
308 {
309         int status;
310 
311         i_size_write(inode, new_i_size);
312         inode->i_blocks = ocfs2_inode_sector_count(inode);
313         inode->i_ctime = inode->i_mtime = current_time(inode);
314 
315         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
316         if (status < 0) {
317                 mlog_errno(status);
318                 goto bail;
319         }
320 
321 bail:
322         return status;
323 }
324 
325 int ocfs2_simple_size_update(struct inode *inode,
326                              struct buffer_head *di_bh,
327                              u64 new_i_size)
328 {
329         int ret;
330         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
331         handle_t *handle = NULL;
332 
333         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
334         if (IS_ERR(handle)) {
335                 ret = PTR_ERR(handle);
336                 mlog_errno(ret);
337                 goto out;
338         }
339 
340         ret = ocfs2_set_inode_size(handle, inode, di_bh,
341                                    new_i_size);
342         if (ret < 0)
343                 mlog_errno(ret);
344 
345         ocfs2_update_inode_fsync_trans(handle, inode, 0);
346         ocfs2_commit_trans(osb, handle);
347 out:
348         return ret;
349 }
350 
351 static int ocfs2_cow_file_pos(struct inode *inode,
352                               struct buffer_head *fe_bh,
353                               u64 offset)
354 {
355         int status;
356         u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
357         unsigned int num_clusters = 0;
358         unsigned int ext_flags = 0;
359 
360         /*
361          * If the new offset is aligned to the range of the cluster, there is
362          * no space for ocfs2_zero_range_for_truncate to fill, so no need to
363          * CoW either.
364          */
365         if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
366                 return 0;
367 
368         status = ocfs2_get_clusters(inode, cpos, &phys,
369                                     &num_clusters, &ext_flags);
370         if (status) {
371                 mlog_errno(status);
372                 goto out;
373         }
374 
375         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
376                 goto out;
377 
378         return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1);
379 
380 out:
381         return status;
382 }
383 
384 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
385                                      struct inode *inode,
386                                      struct buffer_head *fe_bh,
387                                      u64 new_i_size)
388 {
389         int status;
390         handle_t *handle;
391         struct ocfs2_dinode *di;
392         u64 cluster_bytes;
393 
394         /*
395          * We need to CoW the cluster contains the offset if it is reflinked
396          * since we will call ocfs2_zero_range_for_truncate later which will
397          * write "" from offset to the end of the cluster.
398          */
399         status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
400         if (status) {
401                 mlog_errno(status);
402                 return status;
403         }
404 
405         /* TODO: This needs to actually orphan the inode in this
406          * transaction. */
407 
408         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
409         if (IS_ERR(handle)) {
410                 status = PTR_ERR(handle);
411                 mlog_errno(status);
412                 goto out;
413         }
414 
415         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
416                                          OCFS2_JOURNAL_ACCESS_WRITE);
417         if (status < 0) {
418                 mlog_errno(status);
419                 goto out_commit;
420         }
421 
422         /*
423          * Do this before setting i_size.
424          */
425         cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
426         status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
427                                                cluster_bytes);
428         if (status) {
429                 mlog_errno(status);
430                 goto out_commit;
431         }
432 
433         i_size_write(inode, new_i_size);
434         inode->i_ctime = inode->i_mtime = current_time(inode);
435 
436         di = (struct ocfs2_dinode *) fe_bh->b_data;
437         di->i_size = cpu_to_le64(new_i_size);
438         di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
439         di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
440         ocfs2_update_inode_fsync_trans(handle, inode, 0);
441 
442         ocfs2_journal_dirty(handle, fe_bh);
443 
444 out_commit:
445         ocfs2_commit_trans(osb, handle);
446 out:
447         return status;
448 }
449 
450 int ocfs2_truncate_file(struct inode *inode,
451                                struct buffer_head *di_bh,
452                                u64 new_i_size)
453 {
454         int status = 0;
455         struct ocfs2_dinode *fe = NULL;
456         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
457 
458         /* We trust di_bh because it comes from ocfs2_inode_lock(), which
459          * already validated it */
460         fe = (struct ocfs2_dinode *) di_bh->b_data;
461 
462         trace_ocfs2_truncate_file((unsigned long long)OCFS2_I(inode)->ip_blkno,
463                                   (unsigned long long)le64_to_cpu(fe->i_size),
464                                   (unsigned long long)new_i_size);
465 
466         mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
467                         "Inode %llu, inode i_size = %lld != di "
468                         "i_size = %llu, i_flags = 0x%x\n",
469                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
470                         i_size_read(inode),
471                         (unsigned long long)le64_to_cpu(fe->i_size),
472                         le32_to_cpu(fe->i_flags));
473 
474         if (new_i_size > le64_to_cpu(fe->i_size)) {
475                 trace_ocfs2_truncate_file_error(
476                         (unsigned long long)le64_to_cpu(fe->i_size),
477                         (unsigned long long)new_i_size);
478                 status = -EINVAL;
479                 mlog_errno(status);
480                 goto bail;
481         }
482 
483         down_write(&OCFS2_I(inode)->ip_alloc_sem);
484 
485         ocfs2_resv_discard(&osb->osb_la_resmap,
486                            &OCFS2_I(inode)->ip_la_data_resv);
487 
488         /*
489          * The inode lock forced other nodes to sync and drop their
490          * pages, which (correctly) happens even if we have a truncate
491          * without allocation change - ocfs2 cluster sizes can be much
492          * greater than page size, so we have to truncate them
493          * anyway.
494          */
495         unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
496         truncate_inode_pages(inode->i_mapping, new_i_size);
497 
498         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
499                 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
500                                                i_size_read(inode), 1);
501                 if (status)
502                         mlog_errno(status);
503 
504                 goto bail_unlock_sem;
505         }
506 
507         /* alright, we're going to need to do a full blown alloc size
508          * change. Orphan the inode so that recovery can complete the
509          * truncate if necessary. This does the task of marking
510          * i_size. */
511         status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
512         if (status < 0) {
513                 mlog_errno(status);
514                 goto bail_unlock_sem;
515         }
516 
517         status = ocfs2_commit_truncate(osb, inode, di_bh);
518         if (status < 0) {
519                 mlog_errno(status);
520                 goto bail_unlock_sem;
521         }
522 
523         /* TODO: orphan dir cleanup here. */
524 bail_unlock_sem:
525         up_write(&OCFS2_I(inode)->ip_alloc_sem);
526 
527 bail:
528         if (!status && OCFS2_I(inode)->ip_clusters == 0)
529                 status = ocfs2_try_remove_refcount_tree(inode, di_bh);
530 
531         return status;
532 }
533 
534 /*
535  * extend file allocation only here.
536  * we'll update all the disk stuff, and oip->alloc_size
537  *
538  * expect stuff to be locked, a transaction started and enough data /
539  * metadata reservations in the contexts.
540  *
541  * Will return -EAGAIN, and a reason if a restart is needed.
542  * If passed in, *reason will always be set, even in error.
543  */
544 int ocfs2_add_inode_data(struct ocfs2_super *osb,
545                          struct inode *inode,
546                          u32 *logical_offset,
547                          u32 clusters_to_add,
548                          int mark_unwritten,
549                          struct buffer_head *fe_bh,
550                          handle_t *handle,
551                          struct ocfs2_alloc_context *data_ac,
552                          struct ocfs2_alloc_context *meta_ac,
553                          enum ocfs2_alloc_restarted *reason_ret)
554 {
555         int ret;
556         struct ocfs2_extent_tree et;
557 
558         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
559         ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
560                                           clusters_to_add, mark_unwritten,
561                                           data_ac, meta_ac, reason_ret);
562 
563         return ret;
564 }
565 
566 static int ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
567                                    u32 clusters_to_add, int mark_unwritten)
568 {
569         int status = 0;
570         int restart_func = 0;
571         int credits;
572         u32 prev_clusters;
573         struct buffer_head *bh = NULL;
574         struct ocfs2_dinode *fe = NULL;
575         handle_t *handle = NULL;
576         struct ocfs2_alloc_context *data_ac = NULL;
577         struct ocfs2_alloc_context *meta_ac = NULL;
578         enum ocfs2_alloc_restarted why = RESTART_NONE;
579         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
580         struct ocfs2_extent_tree et;
581         int did_quota = 0;
582 
583         /*
584          * Unwritten extent only exists for file systems which
585          * support holes.
586          */
587         BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
588 
589         status = ocfs2_read_inode_block(inode, &bh);
590         if (status < 0) {
591                 mlog_errno(status);
592                 goto leave;
593         }
594         fe = (struct ocfs2_dinode *) bh->b_data;
595 
596 restart_all:
597         BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
598 
599         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
600         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
601                                        &data_ac, &meta_ac);
602         if (status) {
603                 mlog_errno(status);
604                 goto leave;
605         }
606 
607         credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list);
608         handle = ocfs2_start_trans(osb, credits);
609         if (IS_ERR(handle)) {
610                 status = PTR_ERR(handle);
611                 handle = NULL;
612                 mlog_errno(status);
613                 goto leave;
614         }
615 
616 restarted_transaction:
617         trace_ocfs2_extend_allocation(
618                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
619                 (unsigned long long)i_size_read(inode),
620                 le32_to_cpu(fe->i_clusters), clusters_to_add,
621                 why, restart_func);
622 
623         status = dquot_alloc_space_nodirty(inode,
624                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
625         if (status)
626                 goto leave;
627         did_quota = 1;
628 
629         /* reserve a write to the file entry early on - that we if we
630          * run out of credits in the allocation path, we can still
631          * update i_size. */
632         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
633                                          OCFS2_JOURNAL_ACCESS_WRITE);
634         if (status < 0) {
635                 mlog_errno(status);
636                 goto leave;
637         }
638 
639         prev_clusters = OCFS2_I(inode)->ip_clusters;
640 
641         status = ocfs2_add_inode_data(osb,
642                                       inode,
643                                       &logical_start,
644                                       clusters_to_add,
645                                       mark_unwritten,
646                                       bh,
647                                       handle,
648                                       data_ac,
649                                       meta_ac,
650                                       &why);
651         if ((status < 0) && (status != -EAGAIN)) {
652                 if (status != -ENOSPC)
653                         mlog_errno(status);
654                 goto leave;
655         }
656         ocfs2_update_inode_fsync_trans(handle, inode, 1);
657         ocfs2_journal_dirty(handle, bh);
658 
659         spin_lock(&OCFS2_I(inode)->ip_lock);
660         clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
661         spin_unlock(&OCFS2_I(inode)->ip_lock);
662         /* Release unused quota reservation */
663         dquot_free_space(inode,
664                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
665         did_quota = 0;
666 
667         if (why != RESTART_NONE && clusters_to_add) {
668                 if (why == RESTART_META) {
669                         restart_func = 1;
670                         status = 0;
671                 } else {
672                         BUG_ON(why != RESTART_TRANS);
673 
674                         status = ocfs2_allocate_extend_trans(handle, 1);
675                         if (status < 0) {
676                                 /* handle still has to be committed at
677                                  * this point. */
678                                 status = -ENOMEM;
679                                 mlog_errno(status);
680                                 goto leave;
681                         }
682                         goto restarted_transaction;
683                 }
684         }
685 
686         trace_ocfs2_extend_allocation_end(OCFS2_I(inode)->ip_blkno,
687              le32_to_cpu(fe->i_clusters),
688              (unsigned long long)le64_to_cpu(fe->i_size),
689              OCFS2_I(inode)->ip_clusters,
690              (unsigned long long)i_size_read(inode));
691 
692 leave:
693         if (status < 0 && did_quota)
694                 dquot_free_space(inode,
695                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
696         if (handle) {
697                 ocfs2_commit_trans(osb, handle);
698                 handle = NULL;
699         }
700         if (data_ac) {
701                 ocfs2_free_alloc_context(data_ac);
702                 data_ac = NULL;
703         }
704         if (meta_ac) {
705                 ocfs2_free_alloc_context(meta_ac);
706                 meta_ac = NULL;
707         }
708         if ((!status) && restart_func) {
709                 restart_func = 0;
710                 goto restart_all;
711         }
712         brelse(bh);
713         bh = NULL;
714 
715         return status;
716 }
717 
718 /*
719  * While a write will already be ordering the data, a truncate will not.
720  * Thus, we need to explicitly order the zeroed pages.
721  */
722 static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode,
723                                                 struct buffer_head *di_bh)
724 {
725         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
726         handle_t *handle = NULL;
727         int ret = 0;
728 
729         if (!ocfs2_should_order_data(inode))
730                 goto out;
731 
732         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
733         if (IS_ERR(handle)) {
734                 ret = -ENOMEM;
735                 mlog_errno(ret);
736                 goto out;
737         }
738 
739         ret = ocfs2_jbd2_file_inode(handle, inode);
740         if (ret < 0) {
741                 mlog_errno(ret);
742                 goto out;
743         }
744 
745         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
746                                       OCFS2_JOURNAL_ACCESS_WRITE);
747         if (ret)
748                 mlog_errno(ret);
749         ocfs2_update_inode_fsync_trans(handle, inode, 1);
750 
751 out:
752         if (ret) {
753                 if (!IS_ERR(handle))
754                         ocfs2_commit_trans(osb, handle);
755                 handle = ERR_PTR(ret);
756         }
757         return handle;
758 }
759 
760 /* Some parts of this taken from generic_cont_expand, which turned out
761  * to be too fragile to do exactly what we need without us having to
762  * worry about recursive locking in ->write_begin() and ->write_end(). */
763 static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
764                                  u64 abs_to, struct buffer_head *di_bh)
765 {
766         struct address_space *mapping = inode->i_mapping;
767         struct page *page;
768         unsigned long index = abs_from >> PAGE_SHIFT;
769         handle_t *handle;
770         int ret = 0;
771         unsigned zero_from, zero_to, block_start, block_end;
772         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
773 
774         BUG_ON(abs_from >= abs_to);
775         BUG_ON(abs_to > (((u64)index + 1) << PAGE_SHIFT));
776         BUG_ON(abs_from & (inode->i_blkbits - 1));
777 
778         handle = ocfs2_zero_start_ordered_transaction(inode, di_bh);
779         if (IS_ERR(handle)) {
780                 ret = PTR_ERR(handle);
781                 goto out;
782         }
783 
784         page = find_or_create_page(mapping, index, GFP_NOFS);
785         if (!page) {
786                 ret = -ENOMEM;
787                 mlog_errno(ret);
788                 goto out_commit_trans;
789         }
790 
791         /* Get the offsets within the page that we want to zero */
792         zero_from = abs_from & (PAGE_SIZE - 1);
793         zero_to = abs_to & (PAGE_SIZE - 1);
794         if (!zero_to)
795                 zero_to = PAGE_SIZE;
796 
797         trace_ocfs2_write_zero_page(
798                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
799                         (unsigned long long)abs_from,
800                         (unsigned long long)abs_to,
801                         index, zero_from, zero_to);
802 
803         /* We know that zero_from is block aligned */
804         for (block_start = zero_from; block_start < zero_to;
805              block_start = block_end) {
806                 block_end = block_start + i_blocksize(inode);
807 
808                 /*
809                  * block_start is block-aligned.  Bump it by one to force
810                  * __block_write_begin and block_commit_write to zero the
811                  * whole block.
812                  */
813                 ret = __block_write_begin(page, block_start + 1, 0,
814                                           ocfs2_get_block);
815                 if (ret < 0) {
816                         mlog_errno(ret);
817                         goto out_unlock;
818                 }
819 
820 
821                 /* must not update i_size! */
822                 ret = block_commit_write(page, block_start + 1,
823                                          block_start + 1);
824                 if (ret < 0)
825                         mlog_errno(ret);
826                 else
827                         ret = 0;
828         }
829 
830         /*
831          * fs-writeback will release the dirty pages without page lock
832          * whose offset are over inode size, the release happens at
833          * block_write_full_page().
834          */
835         i_size_write(inode, abs_to);
836         inode->i_blocks = ocfs2_inode_sector_count(inode);
837         di->i_size = cpu_to_le64((u64)i_size_read(inode));
838         inode->i_mtime = inode->i_ctime = current_time(inode);
839         di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
840         di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
841         di->i_mtime_nsec = di->i_ctime_nsec;
842         if (handle) {
843                 ocfs2_journal_dirty(handle, di_bh);
844                 ocfs2_update_inode_fsync_trans(handle, inode, 1);
845         }
846 
847 out_unlock:
848         unlock_page(page);
849         put_page(page);
850 out_commit_trans:
851         if (handle)
852                 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
853 out:
854         return ret;
855 }
856 
857 /*
858  * Find the next range to zero.  We do this in terms of bytes because
859  * that's what ocfs2_zero_extend() wants, and it is dealing with the
860  * pagecache.  We may return multiple extents.
861  *
862  * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
863  * needs to be zeroed.  range_start and range_end return the next zeroing
864  * range.  A subsequent call should pass the previous range_end as its
865  * zero_start.  If range_end is 0, there's nothing to do.
866  *
867  * Unwritten extents are skipped over.  Refcounted extents are CoWd.
868  */
869 static int ocfs2_zero_extend_get_range(struct inode *inode,
870                                        struct buffer_head *di_bh,
871                                        u64 zero_start, u64 zero_end,
872                                        u64 *range_start, u64 *range_end)
873 {
874         int rc = 0, needs_cow = 0;
875         u32 p_cpos, zero_clusters = 0;
876         u32 zero_cpos =
877                 zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
878         u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
879         unsigned int num_clusters = 0;
880         unsigned int ext_flags = 0;
881 
882         while (zero_cpos < last_cpos) {
883                 rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
884                                         &num_clusters, &ext_flags);
885                 if (rc) {
886                         mlog_errno(rc);
887                         goto out;
888                 }
889 
890                 if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
891                         zero_clusters = num_clusters;
892                         if (ext_flags & OCFS2_EXT_REFCOUNTED)
893                                 needs_cow = 1;
894                         break;
895                 }
896 
897                 zero_cpos += num_clusters;
898         }
899         if (!zero_clusters) {
900                 *range_end = 0;
901                 goto out;
902         }
903 
904         while ((zero_cpos + zero_clusters) < last_cpos) {
905                 rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
906                                         &p_cpos, &num_clusters,
907                                         &ext_flags);
908                 if (rc) {
909                         mlog_errno(rc);
910                         goto out;
911                 }
912 
913                 if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
914                         break;
915                 if (ext_flags & OCFS2_EXT_REFCOUNTED)
916                         needs_cow = 1;
917                 zero_clusters += num_clusters;
918         }
919         if ((zero_cpos + zero_clusters) > last_cpos)
920                 zero_clusters = last_cpos - zero_cpos;
921 
922         if (needs_cow) {
923                 rc = ocfs2_refcount_cow(inode, di_bh, zero_cpos,
924                                         zero_clusters, UINT_MAX);
925                 if (rc) {
926                         mlog_errno(rc);
927                         goto out;
928                 }
929         }
930 
931         *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
932         *range_end = ocfs2_clusters_to_bytes(inode->i_sb,
933                                              zero_cpos + zero_clusters);
934 
935 out:
936         return rc;
937 }
938 
939 /*
940  * Zero one range returned from ocfs2_zero_extend_get_range().  The caller
941  * has made sure that the entire range needs zeroing.
942  */
943 static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
944                                    u64 range_end, struct buffer_head *di_bh)
945 {
946         int rc = 0;
947         u64 next_pos;
948         u64 zero_pos = range_start;
949 
950         trace_ocfs2_zero_extend_range(
951                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
952                         (unsigned long long)range_start,
953                         (unsigned long long)range_end);
954         BUG_ON(range_start >= range_end);
955 
956         while (zero_pos < range_end) {
957                 next_pos = (zero_pos & PAGE_MASK) + PAGE_SIZE;
958                 if (next_pos > range_end)
959                         next_pos = range_end;
960                 rc = ocfs2_write_zero_page(inode, zero_pos, next_pos, di_bh);
961                 if (rc < 0) {
962                         mlog_errno(rc);
963                         break;
964                 }
965                 zero_pos = next_pos;
966 
967                 /*
968                  * Very large extends have the potential to lock up
969                  * the cpu for extended periods of time.
970                  */
971                 cond_resched();
972         }
973 
974         return rc;
975 }
976 
977 int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
978                       loff_t zero_to_size)
979 {
980         int ret = 0;
981         u64 zero_start, range_start = 0, range_end = 0;
982         struct super_block *sb = inode->i_sb;
983 
984         zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
985         trace_ocfs2_zero_extend((unsigned long long)OCFS2_I(inode)->ip_blkno,
986                                 (unsigned long long)zero_start,
987                                 (unsigned long long)i_size_read(inode));
988         while (zero_start < zero_to_size) {
989                 ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
990                                                   zero_to_size,
991                                                   &range_start,
992                                                   &range_end);
993                 if (ret) {
994                         mlog_errno(ret);
995                         break;
996                 }
997                 if (!range_end)
998                         break;
999                 /* Trim the ends */
1000                 if (range_start < zero_start)
1001                         range_start = zero_start;
1002                 if (range_end > zero_to_size)
1003                         range_end = zero_to_size;
1004 
1005                 ret = ocfs2_zero_extend_range(inode, range_start,
1006                                               range_end, di_bh);
1007                 if (ret) {
1008                         mlog_errno(ret);
1009                         break;
1010                 }
1011                 zero_start = range_end;
1012         }
1013 
1014         return ret;
1015 }
1016 
1017 int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
1018                           u64 new_i_size, u64 zero_to)
1019 {
1020         int ret;
1021         u32 clusters_to_add;
1022         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1023 
1024         /*
1025          * Only quota files call this without a bh, and they can't be
1026          * refcounted.
1027          */
1028         BUG_ON(!di_bh && ocfs2_is_refcount_inode(inode));
1029         BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
1030 
1031         clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
1032         if (clusters_to_add < oi->ip_clusters)
1033                 clusters_to_add = 0;
1034         else
1035                 clusters_to_add -= oi->ip_clusters;
1036 
1037         if (clusters_to_add) {
1038                 ret = ocfs2_extend_allocation(inode, oi->ip_clusters,
1039                                               clusters_to_add, 0);
1040                 if (ret) {
1041                         mlog_errno(ret);
1042                         goto out;
1043                 }
1044         }
1045 
1046         /*
1047          * Call this even if we don't add any clusters to the tree. We
1048          * still need to zero the area between the old i_size and the
1049          * new i_size.
1050          */
1051         ret = ocfs2_zero_extend(inode, di_bh, zero_to);
1052         if (ret < 0)
1053                 mlog_errno(ret);
1054 
1055 out:
1056         return ret;
1057 }
1058 
1059 static int ocfs2_extend_file(struct inode *inode,
1060                              struct buffer_head *di_bh,
1061                              u64 new_i_size)
1062 {
1063         int ret = 0;
1064         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1065 
1066         BUG_ON(!di_bh);
1067 
1068         /* setattr sometimes calls us like this. */
1069         if (new_i_size == 0)
1070                 goto out;
1071 
1072         if (i_size_read(inode) == new_i_size)
1073                 goto out;
1074         BUG_ON(new_i_size < i_size_read(inode));
1075 
1076         /*
1077          * The alloc sem blocks people in read/write from reading our
1078          * allocation until we're done changing it. We depend on
1079          * i_mutex to block other extend/truncate calls while we're
1080          * here.  We even have to hold it for sparse files because there
1081          * might be some tail zeroing.
1082          */
1083         down_write(&oi->ip_alloc_sem);
1084 
1085         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1086                 /*
1087                  * We can optimize small extends by keeping the inodes
1088                  * inline data.
1089                  */
1090                 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1091                         up_write(&oi->ip_alloc_sem);
1092                         goto out_update_size;
1093                 }
1094 
1095                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1096                 if (ret) {
1097                         up_write(&oi->ip_alloc_sem);
1098                         mlog_errno(ret);
1099                         goto out;
1100                 }
1101         }
1102 
1103         if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1104                 ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1105         else
1106                 ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1107                                             new_i_size);
1108 
1109         up_write(&oi->ip_alloc_sem);
1110 
1111         if (ret < 0) {
1112                 mlog_errno(ret);
1113                 goto out;
1114         }
1115 
1116 out_update_size:
1117         ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1118         if (ret < 0)
1119                 mlog_errno(ret);
1120 
1121 out:
1122         return ret;
1123 }
1124 
1125 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1126 {
1127         int status = 0, size_change;
1128         int inode_locked = 0;
1129         struct inode *inode = d_inode(dentry);
1130         struct super_block *sb = inode->i_sb;
1131         struct ocfs2_super *osb = OCFS2_SB(sb);
1132         struct buffer_head *bh = NULL;
1133         handle_t *handle = NULL;
1134         struct dquot *transfer_to[MAXQUOTAS] = { };
1135         int qtype;
1136         int had_lock;
1137         struct ocfs2_lock_holder oh;
1138 
1139         trace_ocfs2_setattr(inode, dentry,
1140                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
1141                             dentry->d_name.len, dentry->d_name.name,
1142                             attr->ia_valid, attr->ia_mode,
1143                             from_kuid(&init_user_ns, attr->ia_uid),
1144                             from_kgid(&init_user_ns, attr->ia_gid));
1145 
1146         /* ensuring we don't even attempt to truncate a symlink */
1147         if (S_ISLNK(inode->i_mode))
1148                 attr->ia_valid &= ~ATTR_SIZE;
1149 
1150 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1151                            | ATTR_GID | ATTR_UID | ATTR_MODE)
1152         if (!(attr->ia_valid & OCFS2_VALID_ATTRS))
1153                 return 0;
1154 
1155         status = setattr_prepare(dentry, attr);
1156         if (status)
1157                 return status;
1158 
1159         if (is_quota_modification(inode, attr)) {
1160                 status = dquot_initialize(inode);
1161                 if (status)
1162                         return status;
1163         }
1164         size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1165         if (size_change) {
1166                 /*
1167                  * Here we should wait dio to finish before inode lock
1168                  * to avoid a deadlock between ocfs2_setattr() and
1169                  * ocfs2_dio_end_io_write()
1170                  */
1171                 inode_dio_wait(inode);
1172 
1173                 status = ocfs2_rw_lock(inode, 1);
1174                 if (status < 0) {
1175                         mlog_errno(status);
1176                         goto bail;
1177                 }
1178         }
1179 
1180         had_lock = ocfs2_inode_lock_tracker(inode, &bh, 1, &oh);
1181         if (had_lock < 0) {
1182                 status = had_lock;
1183                 goto bail_unlock_rw;
1184         } else if (had_lock) {
1185                 /*
1186                  * As far as we know, ocfs2_setattr() could only be the first
1187                  * VFS entry point in the call chain of recursive cluster
1188                  * locking issue.
1189                  *
1190                  * For instance:
1191                  * chmod_common()
1192                  *  notify_change()
1193                  *   ocfs2_setattr()
1194                  *    posix_acl_chmod()
1195                  *     ocfs2_iop_get_acl()
1196                  *
1197                  * But, we're not 100% sure if it's always true, because the
1198                  * ordering of the VFS entry points in the call chain is out
1199                  * of our control. So, we'd better dump the stack here to
1200                  * catch the other cases of recursive locking.
1201                  */
1202                 mlog(ML_ERROR, "Another case of recursive locking:\n");
1203                 dump_stack();
1204         }
1205         inode_locked = 1;
1206 
1207         if (size_change) {
1208                 status = inode_newsize_ok(inode, attr->ia_size);
1209                 if (status)
1210                         goto bail_unlock;
1211 
1212                 if (i_size_read(inode) >= attr->ia_size) {
1213                         if (ocfs2_should_order_data(inode)) {
1214                                 status = ocfs2_begin_ordered_truncate(inode,
1215                                                                       attr->ia_size);
1216                                 if (status)
1217                                         goto bail_unlock;
1218                         }
1219                         status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1220                 } else
1221                         status = ocfs2_extend_file(inode, bh, attr->ia_size);
1222                 if (status < 0) {
1223                         if (status != -ENOSPC)
1224                                 mlog_errno(status);
1225                         status = -ENOSPC;
1226                         goto bail_unlock;
1227                 }
1228         }
1229 
1230         if ((attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
1231             (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
1232                 /*
1233                  * Gather pointers to quota structures so that allocation /
1234                  * freeing of quota structures happens here and not inside
1235                  * dquot_transfer() where we have problems with lock ordering
1236                  */
1237                 if (attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)
1238                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1239                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1240                         transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(attr->ia_uid));
1241                         if (IS_ERR(transfer_to[USRQUOTA])) {
1242                                 status = PTR_ERR(transfer_to[USRQUOTA]);
1243                                 goto bail_unlock;
1244                         }
1245                 }
1246                 if (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid)
1247                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1248                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1249                         transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(attr->ia_gid));
1250                         if (IS_ERR(transfer_to[GRPQUOTA])) {
1251                                 status = PTR_ERR(transfer_to[GRPQUOTA]);
1252                                 goto bail_unlock;
1253                         }
1254                 }
1255                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1256                                            2 * ocfs2_quota_trans_credits(sb));
1257                 if (IS_ERR(handle)) {
1258                         status = PTR_ERR(handle);
1259                         mlog_errno(status);
1260                         goto bail_unlock;
1261                 }
1262                 status = __dquot_transfer(inode, transfer_to);
1263                 if (status < 0)
1264                         goto bail_commit;
1265         } else {
1266                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1267                 if (IS_ERR(handle)) {
1268                         status = PTR_ERR(handle);
1269                         mlog_errno(status);
1270                         goto bail_unlock;
1271                 }
1272         }
1273 
1274         setattr_copy(inode, attr);
1275         mark_inode_dirty(inode);
1276 
1277         status = ocfs2_mark_inode_dirty(handle, inode, bh);
1278         if (status < 0)
1279                 mlog_errno(status);
1280 
1281 bail_commit:
1282         ocfs2_commit_trans(osb, handle);
1283 bail_unlock:
1284         if (status && inode_locked) {
1285                 ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
1286                 inode_locked = 0;
1287         }
1288 bail_unlock_rw:
1289         if (size_change)
1290                 ocfs2_rw_unlock(inode, 1);
1291 bail:
1292 
1293         /* Release quota pointers in case we acquired them */
1294         for (qtype = 0; qtype < OCFS2_MAXQUOTAS; qtype++)
1295                 dqput(transfer_to[qtype]);
1296 
1297         if (!status && attr->ia_valid & ATTR_MODE) {
1298                 status = ocfs2_acl_chmod(inode, bh);
1299                 if (status < 0)
1300                         mlog_errno(status);
1301         }
1302         if (inode_locked)
1303                 ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
1304 
1305         brelse(bh);
1306         return status;
1307 }
1308 
1309 int ocfs2_getattr(const struct path *path, struct kstat *stat,
1310                   u32 request_mask, unsigned int flags)
1311 {
1312         struct inode *inode = d_inode(path->dentry);
1313         struct super_block *sb = path->dentry->d_sb;
1314         struct ocfs2_super *osb = sb->s_fs_info;
1315         int err;
1316 
1317         err = ocfs2_inode_revalidate(path->dentry);
1318         if (err) {
1319                 if (err != -ENOENT)
1320                         mlog_errno(err);
1321                 goto bail;
1322         }
1323 
1324         generic_fillattr(inode, stat);
1325         /*
1326          * If there is inline data in the inode, the inode will normally not
1327          * have data blocks allocated (it may have an external xattr block).
1328          * Report at least one sector for such files, so tools like tar, rsync,
1329          * others don't incorrectly think the file is completely sparse.
1330          */
1331         if (unlikely(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1332                 stat->blocks += (stat->size + 511)>>9;
1333 
1334         /* We set the blksize from the cluster size for performance */
1335         stat->blksize = osb->s_clustersize;
1336 
1337 bail:
1338         return err;
1339 }
1340 
1341 int ocfs2_permission(struct inode *inode, int mask)
1342 {
1343         int ret, had_lock;
1344         struct ocfs2_lock_holder oh;
1345 
1346         if (mask & MAY_NOT_BLOCK)
1347                 return -ECHILD;
1348 
1349         had_lock = ocfs2_inode_lock_tracker(inode, NULL, 0, &oh);
1350         if (had_lock < 0) {
1351                 ret = had_lock;
1352                 goto out;
1353         } else if (had_lock) {
1354                 /* See comments in ocfs2_setattr() for details.
1355                  * The call chain of this case could be:
1356                  * do_sys_open()
1357                  *  may_open()
1358                  *   inode_permission()
1359                  *    ocfs2_permission()
1360                  *     ocfs2_iop_get_acl()
1361                  */
1362                 mlog(ML_ERROR, "Another case of recursive locking:\n");
1363                 dump_stack();
1364         }
1365 
1366         ret = generic_permission(inode, mask);
1367 
1368         ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock);
1369 out:
1370         return ret;
1371 }
1372 
1373 static int __ocfs2_write_remove_suid(struct inode *inode,
1374                                      struct buffer_head *bh)
1375 {
1376         int ret;
1377         handle_t *handle;
1378         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1379         struct ocfs2_dinode *di;
1380 
1381         trace_ocfs2_write_remove_suid(
1382                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1383                         inode->i_mode);
1384 
1385         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1386         if (IS_ERR(handle)) {
1387                 ret = PTR_ERR(handle);
1388                 mlog_errno(ret);
1389                 goto out;
1390         }
1391 
1392         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1393                                       OCFS2_JOURNAL_ACCESS_WRITE);
1394         if (ret < 0) {
1395                 mlog_errno(ret);
1396                 goto out_trans;
1397         }
1398 
1399         inode->i_mode &= ~S_ISUID;
1400         if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1401                 inode->i_mode &= ~S_ISGID;
1402 
1403         di = (struct ocfs2_dinode *) bh->b_data;
1404         di->i_mode = cpu_to_le16(inode->i_mode);
1405         ocfs2_update_inode_fsync_trans(handle, inode, 0);
1406 
1407         ocfs2_journal_dirty(handle, bh);
1408 
1409 out_trans:
1410         ocfs2_commit_trans(osb, handle);
1411 out:
1412         return ret;
1413 }
1414 
1415 static int ocfs2_write_remove_suid(struct inode *inode)
1416 {
1417         int ret;
1418         struct buffer_head *bh = NULL;
1419 
1420         ret = ocfs2_read_inode_block(inode, &bh);
1421         if (ret < 0) {
1422                 mlog_errno(ret);
1423                 goto out;
1424         }
1425 
1426         ret =  __ocfs2_write_remove_suid(inode, bh);
1427 out:
1428         brelse(bh);
1429         return ret;
1430 }
1431 
1432 /*
1433  * Allocate enough extents to cover the region starting at byte offset
1434  * start for len bytes. Existing extents are skipped, any extents
1435  * added are marked as "unwritten".
1436  */
1437 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1438                                             u64 start, u64 len)
1439 {
1440         int ret;
1441         u32 cpos, phys_cpos, clusters, alloc_size;
1442         u64 end = start + len;
1443         struct buffer_head *di_bh = NULL;
1444 
1445         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1446                 ret = ocfs2_read_inode_block(inode, &di_bh);
1447                 if (ret) {
1448                         mlog_errno(ret);
1449                         goto out;
1450                 }
1451 
1452                 /*
1453                  * Nothing to do if the requested reservation range
1454                  * fits within the inode.
1455                  */
1456                 if (ocfs2_size_fits_inline_data(di_bh, end))
1457                         goto out;
1458 
1459                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1460                 if (ret) {
1461                         mlog_errno(ret);
1462                         goto out;
1463                 }
1464         }
1465 
1466         /*
1467          * We consider both start and len to be inclusive.
1468          */
1469         cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1470         clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1471         clusters -= cpos;
1472 
1473         while (clusters) {
1474                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1475                                          &alloc_size, NULL);
1476                 if (ret) {
1477                         mlog_errno(ret);
1478                         goto out;
1479                 }
1480 
1481                 /*
1482                  * Hole or existing extent len can be arbitrary, so
1483                  * cap it to our own allocation request.
1484                  */
1485                 if (alloc_size > clusters)
1486                         alloc_size = clusters;
1487 
1488                 if (phys_cpos) {
1489                         /*
1490                          * We already have an allocation at this
1491                          * region so we can safely skip it.
1492                          */
1493                         goto next;
1494                 }
1495 
1496                 ret = ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1497                 if (ret) {
1498                         if (ret != -ENOSPC)
1499                                 mlog_errno(ret);
1500                         goto out;
1501                 }
1502 
1503 next:
1504                 cpos += alloc_size;
1505                 clusters -= alloc_size;
1506         }
1507 
1508         ret = 0;
1509 out:
1510 
1511         brelse(di_bh);
1512         return ret;
1513 }
1514 
1515 /*
1516  * Truncate a byte range, avoiding pages within partial clusters. This
1517  * preserves those pages for the zeroing code to write to.
1518  */
1519 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1520                                          u64 byte_len)
1521 {
1522         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1523         loff_t start, end;
1524         struct address_space *mapping = inode->i_mapping;
1525 
1526         start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1527         end = byte_start + byte_len;
1528         end = end & ~(osb->s_clustersize - 1);
1529 
1530         if (start < end) {
1531                 unmap_mapping_range(mapping, start, end - start, 0);
1532                 truncate_inode_pages_range(mapping, start, end - 1);
1533         }
1534 }
1535 
1536 static int ocfs2_zero_partial_clusters(struct inode *inode,
1537                                        u64 start, u64 len)
1538 {
1539         int ret = 0;
1540         u64 tmpend = 0;
1541         u64 end = start + len;
1542         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1543         unsigned int csize = osb->s_clustersize;
1544         handle_t *handle;
1545 
1546         /*
1547          * The "start" and "end" values are NOT necessarily part of
1548          * the range whose allocation is being deleted. Rather, this
1549          * is what the user passed in with the request. We must zero
1550          * partial clusters here. There's no need to worry about
1551          * physical allocation - the zeroing code knows to skip holes.
1552          */
1553         trace_ocfs2_zero_partial_clusters(
1554                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1555                 (unsigned long long)start, (unsigned long long)end);
1556 
1557         /*
1558          * If both edges are on a cluster boundary then there's no
1559          * zeroing required as the region is part of the allocation to
1560          * be truncated.
1561          */
1562         if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1563                 goto out;
1564 
1565         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1566         if (IS_ERR(handle)) {
1567                 ret = PTR_ERR(handle);
1568                 mlog_errno(ret);
1569                 goto out;
1570         }
1571 
1572         /*
1573          * If start is on a cluster boundary and end is somewhere in another
1574          * cluster, we have not COWed the cluster starting at start, unless
1575          * end is also within the same cluster. So, in this case, we skip this
1576          * first call to ocfs2_zero_range_for_truncate() truncate and move on
1577          * to the next one.
1578          */
1579         if ((start & (csize - 1)) != 0) {
1580                 /*
1581                  * We want to get the byte offset of the end of the 1st
1582                  * cluster.
1583                  */
1584                 tmpend = (u64)osb->s_clustersize +
1585                         (start & ~(osb->s_clustersize - 1));
1586                 if (tmpend > end)
1587                         tmpend = end;
1588 
1589                 trace_ocfs2_zero_partial_clusters_range1(
1590                         (unsigned long long)start,
1591                         (unsigned long long)tmpend);
1592 
1593                 ret = ocfs2_zero_range_for_truncate(inode, handle, start,
1594                                                     tmpend);
1595                 if (ret)
1596                         mlog_errno(ret);
1597         }
1598 
1599         if (tmpend < end) {
1600                 /*
1601                  * This may make start and end equal, but the zeroing
1602                  * code will skip any work in that case so there's no
1603                  * need to catch it up here.
1604                  */
1605                 start = end & ~(osb->s_clustersize - 1);
1606 
1607                 trace_ocfs2_zero_partial_clusters_range2(
1608                         (unsigned long long)start, (unsigned long long)end);
1609 
1610                 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1611                 if (ret)
1612                         mlog_errno(ret);
1613         }
1614         ocfs2_update_inode_fsync_trans(handle, inode, 1);
1615 
1616         ocfs2_commit_trans(osb, handle);
1617 out:
1618         return ret;
1619 }
1620 
1621 static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1622 {
1623         int i;
1624         struct ocfs2_extent_rec *rec = NULL;
1625 
1626         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1627 
1628                 rec = &el->l_recs[i];
1629 
1630                 if (le32_to_cpu(rec->e_cpos) < pos)
1631                         break;
1632         }
1633 
1634         return i;
1635 }
1636 
1637 /*
1638  * Helper to calculate the punching pos and length in one run, we handle the
1639  * following three cases in order:
1640  *
1641  * - remove the entire record
1642  * - remove a partial record
1643  * - no record needs to be removed (hole-punching completed)
1644 */
1645 static void ocfs2_calc_trunc_pos(struct inode *inode,
1646                                  struct ocfs2_extent_list *el,
1647                                  struct ocfs2_extent_rec *rec,
1648                                  u32 trunc_start, u32 *trunc_cpos,
1649                                  u32 *trunc_len, u32 *trunc_end,
1650                                  u64 *blkno, int *done)
1651 {
1652         int ret = 0;
1653         u32 coff, range;
1654 
1655         range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1656 
1657         if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1658                 /*
1659                  * remove an entire extent record.
1660                  */
1661                 *trunc_cpos = le32_to_cpu(rec->e_cpos);
1662                 /*
1663                  * Skip holes if any.
1664                  */
1665                 if (range < *trunc_end)
1666                         *trunc_end = range;
1667                 *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1668                 *blkno = le64_to_cpu(rec->e_blkno);
1669                 *trunc_end = le32_to_cpu(rec->e_cpos);
1670         } else if (range > trunc_start) {
1671                 /*
1672                  * remove a partial extent record, which means we're
1673                  * removing the last extent record.
1674                  */
1675                 *trunc_cpos = trunc_start;
1676                 /*
1677                  * skip hole if any.
1678                  */
1679                 if (range < *trunc_end)
1680                         *trunc_end = range;
1681                 *trunc_len = *trunc_end - trunc_start;
1682                 coff = trunc_start - le32_to_cpu(rec->e_cpos);
1683                 *blkno = le64_to_cpu(rec->e_blkno) +
1684                                 ocfs2_clusters_to_blocks(inode->i_sb, coff);
1685                 *trunc_end = trunc_start;
1686         } else {
1687                 /*
1688                  * It may have two following possibilities:
1689                  *
1690                  * - last record has been removed
1691                  * - trunc_start was within a hole
1692                  *
1693                  * both two cases mean the completion of hole punching.
1694                  */
1695                 ret = 1;
1696         }
1697 
1698         *done = ret;
1699 }
1700 
1701 int ocfs2_remove_inode_range(struct inode *inode,
1702                              struct buffer_head *di_bh, u64 byte_start,
1703                              u64 byte_len)
1704 {
1705         int ret = 0, flags = 0, done = 0, i;
1706         u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1707         u32 cluster_in_el;
1708         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1709         struct ocfs2_cached_dealloc_ctxt dealloc;
1710         struct address_space *mapping = inode->i_mapping;
1711         struct ocfs2_extent_tree et;
1712         struct ocfs2_path *path = NULL;
1713         struct ocfs2_extent_list *el = NULL;
1714         struct ocfs2_extent_rec *rec = NULL;
1715         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1716         u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1717 
1718         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1719         ocfs2_init_dealloc_ctxt(&dealloc);
1720 
1721         trace_ocfs2_remove_inode_range(
1722                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1723                         (unsigned long long)byte_start,
1724                         (unsigned long long)byte_len);
1725 
1726         if (byte_len == 0)
1727                 return 0;
1728 
1729         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1730                 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1731                                             byte_start + byte_len, 0);
1732                 if (ret) {
1733                         mlog_errno(ret);
1734                         goto out;
1735                 }
1736                 /*
1737                  * There's no need to get fancy with the page cache
1738                  * truncate of an inline-data inode. We're talking
1739                  * about less than a page here, which will be cached
1740                  * in the dinode buffer anyway.
1741                  */
1742                 unmap_mapping_range(mapping, 0, 0, 0);
1743                 truncate_inode_pages(mapping, 0);
1744                 goto out;
1745         }
1746 
1747         /*
1748          * For reflinks, we may need to CoW 2 clusters which might be
1749          * partially zero'd later, if hole's start and end offset were
1750          * within one cluster(means is not exactly aligned to clustersize).
1751          */
1752 
1753         if (ocfs2_is_refcount_inode(inode)) {
1754                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1755                 if (ret) {
1756                         mlog_errno(ret);
1757                         goto out;
1758                 }
1759 
1760                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1761                 if (ret) {
1762                         mlog_errno(ret);
1763                         goto out;
1764                 }
1765         }
1766 
1767         trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1768         trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1769         cluster_in_el = trunc_end;
1770 
1771         ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1772         if (ret) {
1773                 mlog_errno(ret);
1774                 goto out;
1775         }
1776 
1777         path = ocfs2_new_path_from_et(&et);
1778         if (!path) {
1779                 ret = -ENOMEM;
1780                 mlog_errno(ret);
1781                 goto out;
1782         }
1783 
1784         while (trunc_end > trunc_start) {
1785 
1786                 ret = ocfs2_find_path(INODE_CACHE(inode), path,
1787                                       cluster_in_el);
1788                 if (ret) {
1789                         mlog_errno(ret);
1790                         goto out;
1791                 }
1792 
1793                 el = path_leaf_el(path);
1794 
1795                 i = ocfs2_find_rec(el, trunc_end);
1796                 /*
1797                  * Need to go to previous extent block.
1798                  */
1799                 if (i < 0) {
1800                         if (path->p_tree_depth == 0)
1801                                 break;
1802 
1803                         ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1804                                                             path,
1805                                                             &cluster_in_el);
1806                         if (ret) {
1807                                 mlog_errno(ret);
1808                                 goto out;
1809                         }
1810 
1811                         /*
1812                          * We've reached the leftmost extent block,
1813                          * it's safe to leave.
1814                          */
1815                         if (cluster_in_el == 0)
1816                                 break;
1817 
1818                         /*
1819                          * The 'pos' searched for previous extent block is
1820                          * always one cluster less than actual trunc_end.
1821                          */
1822                         trunc_end = cluster_in_el + 1;
1823 
1824                         ocfs2_reinit_path(path, 1);
1825 
1826                         continue;
1827 
1828                 } else
1829                         rec = &el->l_recs[i];
1830 
1831                 ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1832                                      &trunc_len, &trunc_end, &blkno, &done);
1833                 if (done)
1834                         break;
1835 
1836                 flags = rec->e_flags;
1837                 phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1838 
1839                 ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1840                                                phys_cpos, trunc_len, flags,
1841                                                &dealloc, refcount_loc, false);
1842                 if (ret < 0) {
1843                         mlog_errno(ret);
1844                         goto out;
1845                 }
1846 
1847                 cluster_in_el = trunc_end;
1848 
1849                 ocfs2_reinit_path(path, 1);
1850         }
1851 
1852         ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1853 
1854 out:
1855         ocfs2_free_path(path);
1856         ocfs2_schedule_truncate_log_flush(osb, 1);
1857         ocfs2_run_deallocs(osb, &dealloc);
1858 
1859         return ret;
1860 }
1861 
1862 /*
1863  * Parts of this function taken from xfs_change_file_space()
1864  */
1865 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1866                                      loff_t f_pos, unsigned int cmd,
1867                                      struct ocfs2_space_resv *sr,
1868                                      int change_size)
1869 {
1870         int ret;
1871         s64 llen;
1872         loff_t size;
1873         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1874         struct buffer_head *di_bh = NULL;
1875         handle_t *handle;
1876         unsigned long long max_off = inode->i_sb->s_maxbytes;
1877 
1878         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1879                 return -EROFS;
1880 
1881         inode_lock(inode);
1882 
1883         /*
1884          * This prevents concurrent writes on other nodes
1885          */
1886         ret = ocfs2_rw_lock(inode, 1);
1887         if (ret) {
1888                 mlog_errno(ret);
1889                 goto out;
1890         }
1891 
1892         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1893         if (ret) {
1894                 mlog_errno(ret);
1895                 goto out_rw_unlock;
1896         }
1897 
1898         if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1899                 ret = -EPERM;
1900                 goto out_inode_unlock;
1901         }
1902 
1903         switch (sr->l_whence) {
1904         case 0: /*SEEK_SET*/
1905                 break;
1906         case 1: /*SEEK_CUR*/
1907                 sr->l_start += f_pos;
1908                 break;
1909         case 2: /*SEEK_END*/
1910                 sr->l_start += i_size_read(inode);
1911                 break;
1912         default:
1913                 ret = -EINVAL;
1914                 goto out_inode_unlock;
1915         }
1916         sr->l_whence = 0;
1917 
1918         llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1919 
1920         if (sr->l_start < 0
1921             || sr->l_start > max_off
1922             || (sr->l_start + llen) < 0
1923             || (sr->l_start + llen) > max_off) {
1924                 ret = -EINVAL;
1925                 goto out_inode_unlock;
1926         }
1927         size = sr->l_start + sr->l_len;
1928 
1929         if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64 ||
1930             cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) {
1931                 if (sr->l_len <= 0) {
1932                         ret = -EINVAL;
1933                         goto out_inode_unlock;
1934                 }
1935         }
1936 
1937         if (file && should_remove_suid(file->f_path.dentry)) {
1938                 ret = __ocfs2_write_remove_suid(inode, di_bh);
1939                 if (ret) {
1940                         mlog_errno(ret);
1941                         goto out_inode_unlock;
1942                 }
1943         }
1944 
1945         down_write(&OCFS2_I(inode)->ip_alloc_sem);
1946         switch (cmd) {
1947         case OCFS2_IOC_RESVSP:
1948         case OCFS2_IOC_RESVSP64:
1949                 /*
1950                  * This takes unsigned offsets, but the signed ones we
1951                  * pass have been checked against overflow above.
1952                  */
1953                 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1954                                                        sr->l_len);
1955                 break;
1956         case OCFS2_IOC_UNRESVSP:
1957         case OCFS2_IOC_UNRESVSP64:
1958                 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1959                                                sr->l_len);
1960                 break;
1961         default:
1962                 ret = -EINVAL;
1963         }
1964         up_write(&OCFS2_I(inode)->ip_alloc_sem);
1965         if (ret) {
1966                 mlog_errno(ret);
1967                 goto out_inode_unlock;
1968         }
1969 
1970         /*
1971          * We update c/mtime for these changes
1972          */
1973         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1974         if (IS_ERR(handle)) {
1975                 ret = PTR_ERR(handle);
1976                 mlog_errno(ret);
1977                 goto out_inode_unlock;
1978         }
1979 
1980         if (change_size && i_size_read(inode) < size)
1981                 i_size_write(inode, size);
1982 
1983         inode->i_ctime = inode->i_mtime = current_time(inode);
1984         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1985         if (ret < 0)
1986                 mlog_errno(ret);
1987 
1988         if (file && (file->f_flags & O_SYNC))
1989                 handle->h_sync = 1;
1990 
1991         ocfs2_commit_trans(osb, handle);
1992 
1993 out_inode_unlock:
1994         brelse(di_bh);
1995         ocfs2_inode_unlock(inode, 1);
1996 out_rw_unlock:
1997         ocfs2_rw_unlock(inode, 1);
1998 
1999 out:
2000         inode_unlock(inode);
2001         return ret;
2002 }
2003 
2004 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
2005                             struct ocfs2_space_resv *sr)
2006 {
2007         struct inode *inode = file_inode(file);
2008         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2009         int ret;
2010 
2011         if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
2012             !ocfs2_writes_unwritten_extents(osb))
2013                 return -ENOTTY;
2014         else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
2015                  !ocfs2_sparse_alloc(osb))
2016                 return -ENOTTY;
2017 
2018         if (!S_ISREG(inode->i_mode))
2019                 return -EINVAL;
2020 
2021         if (!(file->f_mode & FMODE_WRITE))
2022                 return -EBADF;
2023 
2024         ret = mnt_want_write_file(file);
2025         if (ret)
2026                 return ret;
2027         ret = __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
2028         mnt_drop_write_file(file);
2029         return ret;
2030 }
2031 
2032 static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
2033                             loff_t len)
2034 {
2035         struct inode *inode = file_inode(file);
2036         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2037         struct ocfs2_space_resv sr;
2038         int change_size = 1;
2039         int cmd = OCFS2_IOC_RESVSP64;
2040 
2041         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2042                 return -EOPNOTSUPP;
2043         if (!ocfs2_writes_unwritten_extents(osb))
2044                 return -EOPNOTSUPP;
2045 
2046         if (mode & FALLOC_FL_KEEP_SIZE)
2047                 change_size = 0;
2048 
2049         if (mode & FALLOC_FL_PUNCH_HOLE)
2050                 cmd = OCFS2_IOC_UNRESVSP64;
2051 
2052         sr.l_whence = 0;
2053         sr.l_start = (s64)offset;
2054         sr.l_len = (s64)len;
2055 
2056         return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
2057                                          change_size);
2058 }
2059 
2060 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2061                                    size_t count)
2062 {
2063         int ret = 0;
2064         unsigned int extent_flags;
2065         u32 cpos, clusters, extent_len, phys_cpos;
2066         struct super_block *sb = inode->i_sb;
2067 
2068         if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2069             !ocfs2_is_refcount_inode(inode) ||
2070             OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2071                 return 0;
2072 
2073         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2074         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2075 
2076         while (clusters) {
2077                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2078                                          &extent_flags);
2079                 if (ret < 0) {
2080                         mlog_errno(ret);
2081                         goto out;
2082                 }
2083 
2084                 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2085                         ret = 1;
2086                         break;
2087                 }
2088 
2089                 if (extent_len > clusters)
2090                         extent_len = clusters;
2091 
2092                 clusters -= extent_len;
2093                 cpos += extent_len;
2094         }
2095 out:
2096         return ret;
2097 }
2098 
2099 static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
2100 {
2101         int blockmask = inode->i_sb->s_blocksize - 1;
2102         loff_t final_size = pos + count;
2103 
2104         if ((pos & blockmask) || (final_size & blockmask))
2105                 return 1;
2106         return 0;
2107 }
2108 
2109 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
2110                                             struct file *file,
2111                                             loff_t pos, size_t count,
2112                                             int *meta_level)
2113 {
2114         int ret;
2115         struct buffer_head *di_bh = NULL;
2116         u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2117         u32 clusters =
2118                 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2119 
2120         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2121         if (ret) {
2122                 mlog_errno(ret);
2123                 goto out;
2124         }
2125 
2126         *meta_level = 1;
2127 
2128         ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
2129         if (ret)
2130                 mlog_errno(ret);
2131 out:
2132         brelse(di_bh);
2133         return ret;
2134 }
2135 
2136 static int ocfs2_prepare_inode_for_write(struct file *file,
2137                                          loff_t pos, size_t count, int wait)
2138 {
2139         int ret = 0, meta_level = 0, overwrite_io = 0;
2140         struct dentry *dentry = file->f_path.dentry;
2141         struct inode *inode = d_inode(dentry);
2142         struct buffer_head *di_bh = NULL;
2143         loff_t end;
2144 
2145         /*
2146          * We start with a read level meta lock and only jump to an ex
2147          * if we need to make modifications here.
2148          */
2149         for(;;) {
2150                 if (wait)
2151                         ret = ocfs2_inode_lock(inode, NULL, meta_level);
2152                 else
2153                         ret = ocfs2_try_inode_lock(inode,
2154                                 overwrite_io ? NULL : &di_bh, meta_level);
2155                 if (ret < 0) {
2156                         meta_level = -1;
2157                         if (ret != -EAGAIN)
2158                                 mlog_errno(ret);
2159                         goto out;
2160                 }
2161 
2162                 /*
2163                  * Check if IO will overwrite allocated blocks in case
2164                  * IOCB_NOWAIT flag is set.
2165                  */
2166                 if (!wait && !overwrite_io) {
2167                         overwrite_io = 1;
2168                         if (!down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem)) {
2169                                 ret = -EAGAIN;
2170                                 goto out_unlock;
2171                         }
2172 
2173                         ret = ocfs2_overwrite_io(inode, di_bh, pos, count);
2174                         brelse(di_bh);
2175                         di_bh = NULL;
2176                         up_read(&OCFS2_I(inode)->ip_alloc_sem);
2177                         if (ret < 0) {
2178                                 if (ret != -EAGAIN)
2179                                         mlog_errno(ret);
2180                                 goto out_unlock;
2181                         }
2182                 }
2183 
2184                 /* Clear suid / sgid if necessary. We do this here
2185                  * instead of later in the write path because
2186                  * remove_suid() calls ->setattr without any hint that
2187                  * we may have already done our cluster locking. Since
2188                  * ocfs2_setattr() *must* take cluster locks to
2189                  * proceed, this will lead us to recursively lock the
2190                  * inode. There's also the dinode i_size state which
2191                  * can be lost via setattr during extending writes (we
2192                  * set inode->i_size at the end of a write. */
2193                 if (should_remove_suid(dentry)) {
2194                         if (meta_level == 0) {
2195                                 ocfs2_inode_unlock(inode, meta_level);
2196                                 meta_level = 1;
2197                                 continue;
2198                         }
2199 
2200                         ret = ocfs2_write_remove_suid(inode);
2201                         if (ret < 0) {
2202                                 mlog_errno(ret);
2203                                 goto out_unlock;
2204                         }
2205                 }
2206 
2207                 end = pos + count;
2208 
2209                 ret = ocfs2_check_range_for_refcount(inode, pos, count);
2210                 if (ret == 1) {
2211                         ocfs2_inode_unlock(inode, meta_level);
2212                         meta_level = -1;
2213 
2214                         ret = ocfs2_prepare_inode_for_refcount(inode,
2215                                                                file,
2216                                                                pos,
2217                                                                count,
2218                                                                &meta_level);
2219                 }
2220 
2221                 if (ret < 0) {
2222                         mlog_errno(ret);
2223                         goto out_unlock;
2224                 }
2225 
2226                 break;
2227         }
2228 
2229 out_unlock:
2230         trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
2231                                             pos, count, wait);
2232 
2233         brelse(di_bh);
2234 
2235         if (meta_level >= 0)
2236                 ocfs2_inode_unlock(inode, meta_level);
2237 
2238 out:
2239         return ret;
2240 }
2241 
2242 static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
2243                                     struct iov_iter *from)
2244 {
2245         int rw_level;
2246         ssize_t written = 0;
2247         ssize_t ret;
2248         size_t count = iov_iter_count(from);
2249         struct file *file = iocb->ki_filp;
2250         struct inode *inode = file_inode(file);
2251         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2252         int full_coherency = !(osb->s_mount_opt &
2253                                OCFS2_MOUNT_COHERENCY_BUFFERED);
2254         void *saved_ki_complete = NULL;
2255         int append_write = ((iocb->ki_pos + count) >=
2256                         i_size_read(inode) ? 1 : 0);
2257         int direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
2258         int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
2259 
2260         trace_ocfs2_file_write_iter(inode, file, file->f_path.dentry,
2261                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
2262                 file->f_path.dentry->d_name.len,
2263                 file->f_path.dentry->d_name.name,
2264                 (unsigned int)from->nr_segs);   /* GRRRRR */
2265 
2266         if (!direct_io && nowait)
2267                 return -EOPNOTSUPP;
2268 
2269         if (count == 0)
2270                 return 0;
2271 
2272         if (nowait) {
2273                 if (!inode_trylock(inode))
2274                         return -EAGAIN;
2275         } else
2276                 inode_lock(inode);
2277 
2278         /*
2279          * Concurrent O_DIRECT writes are allowed with
2280          * mount_option "coherency=buffered".
2281          * For append write, we must take rw EX.
2282          */
2283         rw_level = (!direct_io || full_coherency || append_write);
2284 
2285         if (nowait)
2286                 ret = ocfs2_try_rw_lock(inode, rw_level);
2287         else
2288                 ret = ocfs2_rw_lock(inode, rw_level);
2289         if (ret < 0) {
2290                 if (ret != -EAGAIN)
2291                         mlog_errno(ret);
2292                 goto out_mutex;
2293         }
2294 
2295         /*
2296          * O_DIRECT writes with "coherency=full" need to take EX cluster
2297          * inode_lock to guarantee coherency.
2298          */
2299         if (direct_io && full_coherency) {
2300                 /*
2301                  * We need to take and drop the inode lock to force
2302                  * other nodes to drop their caches.  Buffered I/O
2303                  * already does this in write_begin().
2304                  */
2305                 if (nowait)
2306                         ret = ocfs2_try_inode_lock(inode, NULL, 1);
2307                 else
2308                         ret = ocfs2_inode_lock(inode, NULL, 1);
2309                 if (ret < 0) {
2310                         if (ret != -EAGAIN)
2311                                 mlog_errno(ret);
2312                         goto out;
2313                 }
2314 
2315                 ocfs2_inode_unlock(inode, 1);
2316         }
2317 
2318         ret = generic_write_checks(iocb, from);
2319         if (ret <= 0) {
2320                 if (ret)
2321                         mlog_errno(ret);
2322                 goto out;
2323         }
2324         count = ret;
2325 
2326         ret = ocfs2_prepare_inode_for_write(file, iocb->ki_pos, count, !nowait);
2327         if (ret < 0) {
2328                 if (ret != -EAGAIN)
2329                         mlog_errno(ret);
2330                 goto out;
2331         }
2332 
2333         if (direct_io && !is_sync_kiocb(iocb) &&
2334             ocfs2_is_io_unaligned(inode, count, iocb->ki_pos)) {
2335                 /*
2336                  * Make it a sync io if it's an unaligned aio.
2337                  */
2338                 saved_ki_complete = xchg(&iocb->ki_complete, NULL);
2339         }
2340 
2341         /* communicate with ocfs2_dio_end_io */
2342         ocfs2_iocb_set_rw_locked(iocb, rw_level);
2343 
2344         written = __generic_file_write_iter(iocb, from);
2345         /* buffered aio wouldn't have proper lock coverage today */
2346         BUG_ON(written == -EIOCBQUEUED && !direct_io);
2347 
2348         /*
2349          * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2350          * function pointer which is called when o_direct io completes so that
2351          * it can unlock our rw lock.
2352          * Unfortunately there are error cases which call end_io and others
2353          * that don't.  so we don't have to unlock the rw_lock if either an
2354          * async dio is going to do it in the future or an end_io after an
2355          * error has already done it.
2356          */
2357         if ((written == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2358                 rw_level = -1;
2359         }
2360 
2361         if (unlikely(written <= 0))
2362                 goto out;
2363 
2364         if (((file->f_flags & O_DSYNC) && !direct_io) ||
2365             IS_SYNC(inode)) {
2366                 ret = filemap_fdatawrite_range(file->f_mapping,
2367                                                iocb->ki_pos - written,
2368                                                iocb->ki_pos - 1);
2369                 if (ret < 0)
2370                         written = ret;
2371 
2372                 if (!ret) {
2373                         ret = jbd2_journal_force_commit(osb->journal->j_journal);
2374                         if (ret < 0)
2375                                 written = ret;
2376                 }
2377 
2378                 if (!ret)
2379                         ret = filemap_fdatawait_range(file->f_mapping,
2380                                                       iocb->ki_pos - written,
2381                                                       iocb->ki_pos - 1);
2382         }
2383 
2384 out:
2385         if (saved_ki_complete)
2386                 xchg(&iocb->ki_complete, saved_ki_complete);
2387 
2388         if (rw_level != -1)
2389                 ocfs2_rw_unlock(inode, rw_level);
2390 
2391 out_mutex:
2392         inode_unlock(inode);
2393 
2394         if (written)
2395                 ret = written;
2396         return ret;
2397 }
2398 
2399 static ssize_t ocfs2_file_read_iter(struct kiocb *iocb,
2400                                    struct iov_iter *to)
2401 {
2402         int ret = 0, rw_level = -1, lock_level = 0;
2403         struct file *filp = iocb->ki_filp;
2404         struct inode *inode = file_inode(filp);
2405         int direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
2406         int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
2407 
2408         trace_ocfs2_file_read_iter(inode, filp, filp->f_path.dentry,
2409                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2410                         filp->f_path.dentry->d_name.len,
2411                         filp->f_path.dentry->d_name.name,
2412                         to->nr_segs);   /* GRRRRR */
2413 
2414 
2415         if (!inode) {
2416                 ret = -EINVAL;
2417                 mlog_errno(ret);
2418                 goto bail;
2419         }
2420 
2421         if (!direct_io && nowait)
2422                 return -EOPNOTSUPP;
2423 
2424         /*
2425          * buffered reads protect themselves in ->readpage().  O_DIRECT reads
2426          * need locks to protect pending reads from racing with truncate.
2427          */
2428         if (direct_io) {
2429                 if (nowait)
2430                         ret = ocfs2_try_rw_lock(inode, 0);
2431                 else
2432                         ret = ocfs2_rw_lock(inode, 0);
2433 
2434                 if (ret < 0) {
2435                         if (ret != -EAGAIN)
2436                                 mlog_errno(ret);
2437                         goto bail;
2438                 }
2439                 rw_level = 0;
2440                 /* communicate with ocfs2_dio_end_io */
2441                 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2442         }
2443 
2444         /*
2445          * We're fine letting folks race truncates and extending
2446          * writes with read across the cluster, just like they can
2447          * locally. Hence no rw_lock during read.
2448          *
2449          * Take and drop the meta data lock to update inode fields
2450          * like i_size. This allows the checks down below
2451          * generic_file_read_iter() a chance of actually working.
2452          */
2453         ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level,
2454                                      !nowait);
2455         if (ret < 0) {
2456                 if (ret != -EAGAIN)
2457                         mlog_errno(ret);
2458                 goto bail;
2459         }
2460         ocfs2_inode_unlock(inode, lock_level);
2461 
2462         ret = generic_file_read_iter(iocb, to);
2463         trace_generic_file_read_iter_ret(ret);
2464 
2465         /* buffered aio wouldn't have proper lock coverage today */
2466         BUG_ON(ret == -EIOCBQUEUED && !direct_io);
2467 
2468         /* see ocfs2_file_write_iter */
2469         if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2470                 rw_level = -1;
2471         }
2472 
2473 bail:
2474         if (rw_level != -1)
2475                 ocfs2_rw_unlock(inode, rw_level);
2476 
2477         return ret;
2478 }
2479 
2480 /* Refer generic_file_llseek_unlocked() */
2481 static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int whence)
2482 {
2483         struct inode *inode = file->f_mapping->host;
2484         int ret = 0;
2485 
2486         inode_lock(inode);
2487 
2488         switch (whence) {
2489         case SEEK_SET:
2490                 break;
2491         case SEEK_END:
2492                 /* SEEK_END requires the OCFS2 inode lock for the file
2493                  * because it references the file's size.
2494                  */
2495                 ret = ocfs2_inode_lock(inode, NULL, 0);
2496                 if (ret < 0) {
2497                         mlog_errno(ret);
2498                         goto out;
2499                 }
2500                 offset += i_size_read(inode);
2501                 ocfs2_inode_unlock(inode, 0);
2502                 break;
2503         case SEEK_CUR:
2504                 if (offset == 0) {
2505                         offset = file->f_pos;
2506                         goto out;
2507                 }
2508                 offset += file->f_pos;
2509                 break;
2510         case SEEK_DATA:
2511         case SEEK_HOLE:
2512                 ret = ocfs2_seek_data_hole_offset(file, &offset, whence);
2513                 if (ret)
2514                         goto out;
2515                 break;
2516         default:
2517                 ret = -EINVAL;
2518                 goto out;
2519         }
2520 
2521         offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
2522 
2523 out:
2524         inode_unlock(inode);
2525         if (ret)
2526                 return ret;
2527         return offset;
2528 }
2529 
2530 static loff_t ocfs2_remap_file_range(struct file *file_in, loff_t pos_in,
2531                                      struct file *file_out, loff_t pos_out,
2532                                      loff_t len, unsigned int remap_flags)
2533 {
2534         struct inode *inode_in = file_inode(file_in);
2535         struct inode *inode_out = file_inode(file_out);
2536         struct ocfs2_super *osb = OCFS2_SB(inode_in->i_sb);
2537         struct buffer_head *in_bh = NULL, *out_bh = NULL;
2538         bool same_inode = (inode_in == inode_out);
2539         loff_t remapped = 0;
2540         ssize_t ret;
2541 
2542         if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
2543                 return -EINVAL;
2544         if (!ocfs2_refcount_tree(osb))
2545                 return -EOPNOTSUPP;
2546         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
2547                 return -EROFS;
2548 
2549         /* Lock both files against IO */
2550         ret = ocfs2_reflink_inodes_lock(inode_in, &in_bh, inode_out, &out_bh);
2551         if (ret)
2552                 return ret;
2553 
2554         /* Check file eligibility and prepare for block sharing. */
2555         ret = -EINVAL;
2556         if ((OCFS2_I(inode_in)->ip_flags & OCFS2_INODE_SYSTEM_FILE) ||
2557             (OCFS2_I(inode_out)->ip_flags & OCFS2_INODE_SYSTEM_FILE))
2558                 goto out_unlock;
2559 
2560         ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out,
2561                         &len, remap_flags);
2562         if (ret < 0 || len == 0)
2563                 goto out_unlock;
2564 
2565         /* Lock out changes to the allocation maps and remap. */
2566         down_write(&OCFS2_I(inode_in)->ip_alloc_sem);
2567         if (!same_inode)
2568                 down_write_nested(&OCFS2_I(inode_out)->ip_alloc_sem,
2569                                   SINGLE_DEPTH_NESTING);
2570 
2571         /* Zap any page cache for the destination file's range. */
2572         truncate_inode_pages_range(&inode_out->i_data,
2573                                    round_down(pos_out, PAGE_SIZE),
2574                                    round_up(pos_out + len, PAGE_SIZE) - 1);
2575 
2576         remapped = ocfs2_reflink_remap_blocks(inode_in, in_bh, pos_in,
2577                         inode_out, out_bh, pos_out, len);
2578         up_write(&OCFS2_I(inode_in)->ip_alloc_sem);
2579         if (!same_inode)
2580                 up_write(&OCFS2_I(inode_out)->ip_alloc_sem);
2581         if (remapped < 0) {
2582                 ret = remapped;
2583                 mlog_errno(ret);
2584                 goto out_unlock;
2585         }
2586 
2587         /*
2588          * Empty the extent map so that we may get the right extent
2589          * record from the disk.
2590          */
2591         ocfs2_extent_map_trunc(inode_in, 0);
2592         ocfs2_extent_map_trunc(inode_out, 0);
2593 
2594         ret = ocfs2_reflink_update_dest(inode_out, out_bh, pos_out + len);
2595         if (ret) {
2596                 mlog_errno(ret);
2597                 goto out_unlock;
2598         }
2599 
2600 out_unlock:
2601         ocfs2_reflink_inodes_unlock(inode_in, in_bh, inode_out, out_bh);
2602         return remapped > 0 ? remapped : ret;
2603 }
2604 
2605 const struct inode_operations ocfs2_file_iops = {
2606         .setattr        = ocfs2_setattr,
2607         .getattr        = ocfs2_getattr,
2608         .permission     = ocfs2_permission,
2609         .listxattr      = ocfs2_listxattr,
2610         .fiemap         = ocfs2_fiemap,
2611         .get_acl        = ocfs2_iop_get_acl,
2612         .set_acl        = ocfs2_iop_set_acl,
2613 };
2614 
2615 const struct inode_operations ocfs2_special_file_iops = {
2616         .setattr        = ocfs2_setattr,
2617         .getattr        = ocfs2_getattr,
2618         .permission     = ocfs2_permission,
2619         .get_acl        = ocfs2_iop_get_acl,
2620         .set_acl        = ocfs2_iop_set_acl,
2621 };
2622 
2623 /*
2624  * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2625  * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2626  */
2627 const struct file_operations ocfs2_fops = {
2628         .llseek         = ocfs2_file_llseek,
2629         .mmap           = ocfs2_mmap,
2630         .fsync          = ocfs2_sync_file,
2631         .release        = ocfs2_file_release,
2632         .open           = ocfs2_file_open,
2633         .read_iter      = ocfs2_file_read_iter,
2634         .write_iter     = ocfs2_file_write_iter,
2635         .unlocked_ioctl = ocfs2_ioctl,
2636 #ifdef CONFIG_COMPAT
2637         .compat_ioctl   = ocfs2_compat_ioctl,
2638 #endif
2639         .lock           = ocfs2_lock,
2640         .flock          = ocfs2_flock,
2641         .splice_read    = generic_file_splice_read,
2642         .splice_write   = iter_file_splice_write,
2643         .fallocate      = ocfs2_fallocate,
2644         .remap_file_range = ocfs2_remap_file_range,
2645 };
2646 
2647 const struct file_operations ocfs2_dops = {
2648         .llseek         = generic_file_llseek,
2649         .read           = generic_read_dir,
2650         .iterate        = ocfs2_readdir,
2651         .fsync          = ocfs2_sync_file,
2652         .release        = ocfs2_dir_release,
2653         .open           = ocfs2_dir_open,
2654         .unlocked_ioctl = ocfs2_ioctl,
2655 #ifdef CONFIG_COMPAT
2656         .compat_ioctl   = ocfs2_compat_ioctl,
2657 #endif
2658         .lock           = ocfs2_lock,
2659         .flock          = ocfs2_flock,
2660 };
2661 
2662 /*
2663  * POSIX-lockless variants of our file_operations.
2664  *
2665  * These will be used if the underlying cluster stack does not support
2666  * posix file locking, if the user passes the "localflocks" mount
2667  * option, or if we have a local-only fs.
2668  *
2669  * ocfs2_flock is in here because all stacks handle UNIX file locks,
2670  * so we still want it in the case of no stack support for
2671  * plocks. Internally, it will do the right thing when asked to ignore
2672  * the cluster.
2673  */
2674 const struct file_operations ocfs2_fops_no_plocks = {
2675         .llseek         = ocfs2_file_llseek,
2676         .mmap           = ocfs2_mmap,
2677         .fsync          = ocfs2_sync_file,
2678         .release        = ocfs2_file_release,
2679         .open           = ocfs2_file_open,
2680         .read_iter      = ocfs2_file_read_iter,
2681         .write_iter     = ocfs2_file_write_iter,
2682         .unlocked_ioctl = ocfs2_ioctl,
2683 #ifdef CONFIG_COMPAT
2684         .compat_ioctl   = ocfs2_compat_ioctl,
2685 #endif
2686         .flock          = ocfs2_flock,
2687         .splice_read    = generic_file_splice_read,
2688         .splice_write   = iter_file_splice_write,
2689         .fallocate      = ocfs2_fallocate,
2690         .remap_file_range = ocfs2_remap_file_range,
2691 };
2692 
2693 const struct file_operations ocfs2_dops_no_plocks = {
2694         .llseek         = generic_file_llseek,
2695         .read           = generic_read_dir,
2696         .iterate        = ocfs2_readdir,
2697         .fsync          = ocfs2_sync_file,
2698         .release        = ocfs2_dir_release,
2699         .open           = ocfs2_dir_open,
2700         .unlocked_ioctl = ocfs2_ioctl,
2701 #ifdef CONFIG_COMPAT
2702         .compat_ioctl   = ocfs2_compat_ioctl,
2703 #endif
2704         .flock          = ocfs2_flock,
2705 };
2706 

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