1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * File open, close, extend, truncate
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
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.
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.
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.
26 #include <linux/capability.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>
39 #define MLOG_MASK_PREFIX ML_INODE
40 #include <cluster/masklog.h>
48 #include "extent_map.h"
58 #include "buffer_head_io.h"
60 static int ocfs2_sync_inode(struct inode
*inode
)
62 filemap_fdatawrite(inode
->i_mapping
);
63 return sync_mapping_buffers(inode
->i_mapping
);
66 static int ocfs2_file_open(struct inode
*inode
, struct file
*file
)
69 int mode
= file
->f_flags
;
70 struct ocfs2_inode_info
*oi
= OCFS2_I(inode
);
72 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode
, file
,
73 file
->f_path
.dentry
->d_name
.len
, file
->f_path
.dentry
->d_name
.name
);
75 spin_lock(&oi
->ip_lock
);
77 /* Check that the inode hasn't been wiped from disk by another
78 * node. If it hasn't then we're safe as long as we hold the
79 * spin lock until our increment of open count. */
80 if (OCFS2_I(inode
)->ip_flags
& OCFS2_INODE_DELETED
) {
81 spin_unlock(&oi
->ip_lock
);
88 oi
->ip_flags
|= OCFS2_INODE_OPEN_DIRECT
;
91 spin_unlock(&oi
->ip_lock
);
98 static int ocfs2_file_release(struct inode
*inode
, struct file
*file
)
100 struct ocfs2_inode_info
*oi
= OCFS2_I(inode
);
102 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode
, file
,
103 file
->f_path
.dentry
->d_name
.len
,
104 file
->f_path
.dentry
->d_name
.name
);
106 spin_lock(&oi
->ip_lock
);
107 if (!--oi
->ip_open_count
)
108 oi
->ip_flags
&= ~OCFS2_INODE_OPEN_DIRECT
;
109 spin_unlock(&oi
->ip_lock
);
116 static int ocfs2_sync_file(struct file
*file
,
117 struct dentry
*dentry
,
122 struct inode
*inode
= dentry
->d_inode
;
123 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
125 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file
, dentry
, datasync
,
126 dentry
->d_name
.len
, dentry
->d_name
.name
);
128 err
= ocfs2_sync_inode(dentry
->d_inode
);
132 journal
= osb
->journal
->j_journal
;
133 err
= journal_force_commit(journal
);
138 return (err
< 0) ? -EIO
: 0;
141 int ocfs2_should_update_atime(struct inode
*inode
,
142 struct vfsmount
*vfsmnt
)
145 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
147 if (ocfs2_is_hard_readonly(osb
) || ocfs2_is_soft_readonly(osb
))
150 if ((inode
->i_flags
& S_NOATIME
) ||
151 ((inode
->i_sb
->s_flags
& MS_NODIRATIME
) && S_ISDIR(inode
->i_mode
)))
155 * We can be called with no vfsmnt structure - NFSD will
158 * Note that our action here is different than touch_atime() -
159 * if we can't tell whether this is a noatime mount, then we
160 * don't know whether to trust the value of s_atime_quantum.
165 if ((vfsmnt
->mnt_flags
& MNT_NOATIME
) ||
166 ((vfsmnt
->mnt_flags
& MNT_NODIRATIME
) && S_ISDIR(inode
->i_mode
)))
169 if (vfsmnt
->mnt_flags
& MNT_RELATIME
) {
170 if ((timespec_compare(&inode
->i_atime
, &inode
->i_mtime
) <= 0) ||
171 (timespec_compare(&inode
->i_atime
, &inode
->i_ctime
) <= 0))
178 if ((now
.tv_sec
- inode
->i_atime
.tv_sec
<= osb
->s_atime_quantum
))
184 int ocfs2_update_inode_atime(struct inode
*inode
,
185 struct buffer_head
*bh
)
188 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
193 handle
= ocfs2_start_trans(osb
, OCFS2_INODE_UPDATE_CREDITS
);
194 if (handle
== NULL
) {
200 inode
->i_atime
= CURRENT_TIME
;
201 ret
= ocfs2_mark_inode_dirty(handle
, inode
, bh
);
205 ocfs2_commit_trans(OCFS2_SB(inode
->i_sb
), handle
);
211 static int ocfs2_set_inode_size(handle_t
*handle
,
213 struct buffer_head
*fe_bh
,
219 i_size_write(inode
, new_i_size
);
220 inode
->i_blocks
= ocfs2_inode_sector_count(inode
);
221 inode
->i_ctime
= inode
->i_mtime
= CURRENT_TIME
;
223 status
= ocfs2_mark_inode_dirty(handle
, inode
, fe_bh
);
234 static int ocfs2_simple_size_update(struct inode
*inode
,
235 struct buffer_head
*di_bh
,
239 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
240 handle_t
*handle
= NULL
;
242 handle
= ocfs2_start_trans(osb
, OCFS2_INODE_UPDATE_CREDITS
);
243 if (handle
== NULL
) {
249 ret
= ocfs2_set_inode_size(handle
, inode
, di_bh
,
254 ocfs2_commit_trans(osb
, handle
);
259 static int ocfs2_orphan_for_truncate(struct ocfs2_super
*osb
,
261 struct buffer_head
*fe_bh
,
266 struct ocfs2_dinode
*di
;
271 /* TODO: This needs to actually orphan the inode in this
274 handle
= ocfs2_start_trans(osb
, OCFS2_INODE_UPDATE_CREDITS
);
275 if (IS_ERR(handle
)) {
276 status
= PTR_ERR(handle
);
281 status
= ocfs2_journal_access(handle
, inode
, fe_bh
,
282 OCFS2_JOURNAL_ACCESS_WRITE
);
289 * Do this before setting i_size.
291 cluster_bytes
= ocfs2_align_bytes_to_clusters(inode
->i_sb
, new_i_size
);
292 status
= ocfs2_zero_range_for_truncate(inode
, handle
, new_i_size
,
299 i_size_write(inode
, new_i_size
);
300 inode
->i_blocks
= ocfs2_align_bytes_to_sectors(new_i_size
);
301 inode
->i_ctime
= inode
->i_mtime
= CURRENT_TIME
;
303 di
= (struct ocfs2_dinode
*) fe_bh
->b_data
;
304 di
->i_size
= cpu_to_le64(new_i_size
);
305 di
->i_ctime
= di
->i_mtime
= cpu_to_le64(inode
->i_ctime
.tv_sec
);
306 di
->i_ctime_nsec
= di
->i_mtime_nsec
= cpu_to_le32(inode
->i_ctime
.tv_nsec
);
308 status
= ocfs2_journal_dirty(handle
, fe_bh
);
313 ocfs2_commit_trans(osb
, handle
);
320 static int ocfs2_truncate_file(struct inode
*inode
,
321 struct buffer_head
*di_bh
,
325 struct ocfs2_dinode
*fe
= NULL
;
326 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
327 struct ocfs2_truncate_context
*tc
= NULL
;
329 mlog_entry("(inode = %llu, new_i_size = %llu\n",
330 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
331 (unsigned long long)new_i_size
);
333 fe
= (struct ocfs2_dinode
*) di_bh
->b_data
;
334 if (!OCFS2_IS_VALID_DINODE(fe
)) {
335 OCFS2_RO_ON_INVALID_DINODE(inode
->i_sb
, fe
);
340 mlog_bug_on_msg(le64_to_cpu(fe
->i_size
) != i_size_read(inode
),
341 "Inode %llu, inode i_size = %lld != di "
342 "i_size = %llu, i_flags = 0x%x\n",
343 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
345 (unsigned long long)le64_to_cpu(fe
->i_size
),
346 le32_to_cpu(fe
->i_flags
));
348 if (new_i_size
> le64_to_cpu(fe
->i_size
)) {
349 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
350 (unsigned long long)le64_to_cpu(fe
->i_size
),
351 (unsigned long long)new_i_size
);
357 mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
358 (unsigned long long)le64_to_cpu(fe
->i_blkno
),
359 (unsigned long long)le64_to_cpu(fe
->i_size
),
360 (unsigned long long)new_i_size
);
362 /* lets handle the simple truncate cases before doing any more
363 * cluster locking. */
364 if (new_i_size
== le64_to_cpu(fe
->i_size
))
367 down_write(&OCFS2_I(inode
)->ip_alloc_sem
);
369 /* This forces other nodes to sync and drop their pages. Do
370 * this even if we have a truncate without allocation change -
371 * ocfs2 cluster sizes can be much greater than page size, so
372 * we have to truncate them anyway. */
373 status
= ocfs2_data_lock(inode
, 1);
375 up_write(&OCFS2_I(inode
)->ip_alloc_sem
);
381 unmap_mapping_range(inode
->i_mapping
, new_i_size
+ PAGE_SIZE
- 1, 0, 1);
382 truncate_inode_pages(inode
->i_mapping
, new_i_size
);
384 /* alright, we're going to need to do a full blown alloc size
385 * change. Orphan the inode so that recovery can complete the
386 * truncate if necessary. This does the task of marking
388 status
= ocfs2_orphan_for_truncate(osb
, inode
, di_bh
, new_i_size
);
391 goto bail_unlock_data
;
394 status
= ocfs2_prepare_truncate(osb
, inode
, di_bh
, &tc
);
397 goto bail_unlock_data
;
400 status
= ocfs2_commit_truncate(osb
, inode
, di_bh
, tc
);
403 goto bail_unlock_data
;
406 /* TODO: orphan dir cleanup here. */
408 ocfs2_data_unlock(inode
, 1);
410 up_write(&OCFS2_I(inode
)->ip_alloc_sem
);
419 * extend allocation only here.
420 * we'll update all the disk stuff, and oip->alloc_size
422 * expect stuff to be locked, a transaction started and enough data /
423 * metadata reservations in the contexts.
425 * Will return -EAGAIN, and a reason if a restart is needed.
426 * If passed in, *reason will always be set, even in error.
428 int ocfs2_do_extend_allocation(struct ocfs2_super
*osb
,
433 struct buffer_head
*fe_bh
,
435 struct ocfs2_alloc_context
*data_ac
,
436 struct ocfs2_alloc_context
*meta_ac
,
437 enum ocfs2_alloc_restarted
*reason_ret
)
441 struct ocfs2_dinode
*fe
= (struct ocfs2_dinode
*) fe_bh
->b_data
;
442 enum ocfs2_alloc_restarted reason
= RESTART_NONE
;
443 u32 bit_off
, num_bits
;
447 BUG_ON(!clusters_to_add
);
450 flags
= OCFS2_EXT_UNWRITTEN
;
452 free_extents
= ocfs2_num_free_extents(osb
, inode
, fe
);
453 if (free_extents
< 0) {
454 status
= free_extents
;
459 /* there are two cases which could cause us to EAGAIN in the
460 * we-need-more-metadata case:
461 * 1) we haven't reserved *any*
462 * 2) we are so fragmented, we've needed to add metadata too
464 if (!free_extents
&& !meta_ac
) {
465 mlog(0, "we haven't reserved any metadata!\n");
467 reason
= RESTART_META
;
469 } else if ((!free_extents
)
470 && (ocfs2_alloc_context_bits_left(meta_ac
)
471 < ocfs2_extend_meta_needed(fe
))) {
472 mlog(0, "filesystem is really fragmented...\n");
474 reason
= RESTART_META
;
478 status
= ocfs2_claim_clusters(osb
, handle
, data_ac
, 1,
479 &bit_off
, &num_bits
);
481 if (status
!= -ENOSPC
)
486 BUG_ON(num_bits
> clusters_to_add
);
488 /* reserve our write early -- insert_extent may update the inode */
489 status
= ocfs2_journal_access(handle
, inode
, fe_bh
,
490 OCFS2_JOURNAL_ACCESS_WRITE
);
496 block
= ocfs2_clusters_to_blocks(osb
->sb
, bit_off
);
497 mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
498 num_bits
, bit_off
, (unsigned long long)OCFS2_I(inode
)->ip_blkno
);
499 status
= ocfs2_insert_extent(osb
, handle
, inode
, fe_bh
,
500 *logical_offset
, block
, num_bits
,
507 status
= ocfs2_journal_dirty(handle
, fe_bh
);
513 clusters_to_add
-= num_bits
;
514 *logical_offset
+= num_bits
;
516 if (clusters_to_add
) {
517 mlog(0, "need to alloc once more, clusters = %u, wanted = "
518 "%u\n", fe
->i_clusters
, clusters_to_add
);
520 reason
= RESTART_TRANS
;
526 *reason_ret
= reason
;
531 * For a given allocation, determine which allocators will need to be
532 * accessed, and lock them, reserving the appropriate number of bits.
534 * Sparse file systems call this from ocfs2_write_begin_nolock()
535 * and ocfs2_allocate_unwritten_extents().
537 * File systems which don't support holes call this from
538 * ocfs2_extend_allocation().
540 int ocfs2_lock_allocators(struct inode
*inode
, struct ocfs2_dinode
*di
,
541 u32 clusters_to_add
, u32 extents_to_split
,
542 struct ocfs2_alloc_context
**data_ac
,
543 struct ocfs2_alloc_context
**meta_ac
)
545 int ret
= 0, num_free_extents
;
546 unsigned int max_recs_needed
= clusters_to_add
+ 2 * extents_to_split
;
547 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
553 BUG_ON(clusters_to_add
!= 0 && data_ac
== NULL
);
555 mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
556 "clusters_to_add = %u, extents_to_split = %u\n",
557 (unsigned long long)OCFS2_I(inode
)->ip_blkno
, i_size_read(inode
),
558 le32_to_cpu(di
->i_clusters
), clusters_to_add
, extents_to_split
);
560 num_free_extents
= ocfs2_num_free_extents(osb
, inode
, di
);
561 if (num_free_extents
< 0) {
562 ret
= num_free_extents
;
568 * Sparse allocation file systems need to be more conservative
569 * with reserving room for expansion - the actual allocation
570 * happens while we've got a journal handle open so re-taking
571 * a cluster lock (because we ran out of room for another
572 * extent) will violate ordering rules.
574 * Most of the time we'll only be seeing this 1 cluster at a time
577 * Always lock for any unwritten extents - we might want to
578 * add blocks during a split.
580 if (!num_free_extents
||
581 (ocfs2_sparse_alloc(osb
) && num_free_extents
< max_recs_needed
)) {
582 ret
= ocfs2_reserve_new_metadata(osb
, di
, meta_ac
);
590 if (clusters_to_add
== 0)
593 ret
= ocfs2_reserve_clusters(osb
, clusters_to_add
, data_ac
);
603 ocfs2_free_alloc_context(*meta_ac
);
608 * We cannot have an error and a non null *data_ac.
615 static int __ocfs2_extend_allocation(struct inode
*inode
, u32 logical_start
,
616 u32 clusters_to_add
, int mark_unwritten
)
619 int restart_func
= 0;
622 struct buffer_head
*bh
= NULL
;
623 struct ocfs2_dinode
*fe
= NULL
;
624 handle_t
*handle
= NULL
;
625 struct ocfs2_alloc_context
*data_ac
= NULL
;
626 struct ocfs2_alloc_context
*meta_ac
= NULL
;
627 enum ocfs2_alloc_restarted why
;
628 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
630 mlog_entry("(clusters_to_add = %u)\n", clusters_to_add
);
633 * This function only exists for file systems which don't
636 BUG_ON(mark_unwritten
&& !ocfs2_sparse_alloc(osb
));
638 status
= ocfs2_read_block(osb
, OCFS2_I(inode
)->ip_blkno
, &bh
,
639 OCFS2_BH_CACHED
, inode
);
645 fe
= (struct ocfs2_dinode
*) bh
->b_data
;
646 if (!OCFS2_IS_VALID_DINODE(fe
)) {
647 OCFS2_RO_ON_INVALID_DINODE(inode
->i_sb
, fe
);
653 BUG_ON(le32_to_cpu(fe
->i_clusters
) != OCFS2_I(inode
)->ip_clusters
);
655 status
= ocfs2_lock_allocators(inode
, fe
, clusters_to_add
, 0, &data_ac
,
662 credits
= ocfs2_calc_extend_credits(osb
->sb
, fe
, clusters_to_add
);
663 handle
= ocfs2_start_trans(osb
, credits
);
664 if (IS_ERR(handle
)) {
665 status
= PTR_ERR(handle
);
671 restarted_transaction
:
672 /* reserve a write to the file entry early on - that we if we
673 * run out of credits in the allocation path, we can still
675 status
= ocfs2_journal_access(handle
, inode
, bh
,
676 OCFS2_JOURNAL_ACCESS_WRITE
);
682 prev_clusters
= OCFS2_I(inode
)->ip_clusters
;
684 status
= ocfs2_do_extend_allocation(osb
,
694 if ((status
< 0) && (status
!= -EAGAIN
)) {
695 if (status
!= -ENOSPC
)
700 status
= ocfs2_journal_dirty(handle
, bh
);
706 spin_lock(&OCFS2_I(inode
)->ip_lock
);
707 clusters_to_add
-= (OCFS2_I(inode
)->ip_clusters
- prev_clusters
);
708 spin_unlock(&OCFS2_I(inode
)->ip_lock
);
710 if (why
!= RESTART_NONE
&& clusters_to_add
) {
711 if (why
== RESTART_META
) {
712 mlog(0, "restarting function.\n");
715 BUG_ON(why
!= RESTART_TRANS
);
717 mlog(0, "restarting transaction.\n");
718 /* TODO: This can be more intelligent. */
719 credits
= ocfs2_calc_extend_credits(osb
->sb
,
722 status
= ocfs2_extend_trans(handle
, credits
);
724 /* handle still has to be committed at
730 goto restarted_transaction
;
734 mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
735 le32_to_cpu(fe
->i_clusters
),
736 (unsigned long long)le64_to_cpu(fe
->i_size
));
737 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
738 OCFS2_I(inode
)->ip_clusters
, i_size_read(inode
));
742 ocfs2_commit_trans(osb
, handle
);
746 ocfs2_free_alloc_context(data_ac
);
750 ocfs2_free_alloc_context(meta_ac
);
753 if ((!status
) && restart_func
) {
766 static int ocfs2_extend_allocation(struct inode
*inode
, u32 logical_start
,
767 u32 clusters_to_add
, int mark_unwritten
)
772 * The alloc sem blocks peope in read/write from reading our
773 * allocation until we're done changing it. We depend on
774 * i_mutex to block other extend/truncate calls while we're
777 down_write(&OCFS2_I(inode
)->ip_alloc_sem
);
778 ret
= __ocfs2_extend_allocation(inode
, logical_start
, clusters_to_add
,
780 up_write(&OCFS2_I(inode
)->ip_alloc_sem
);
785 /* Some parts of this taken from generic_cont_expand, which turned out
786 * to be too fragile to do exactly what we need without us having to
787 * worry about recursive locking in ->prepare_write() and
788 * ->commit_write(). */
789 static int ocfs2_write_zero_page(struct inode
*inode
,
792 struct address_space
*mapping
= inode
->i_mapping
;
796 handle_t
*handle
= NULL
;
799 offset
= (size
& (PAGE_CACHE_SIZE
-1)); /* Within page */
800 /* ugh. in prepare/commit_write, if from==to==start of block, we
801 ** skip the prepare. make sure we never send an offset for the start
804 if ((offset
& (inode
->i_sb
->s_blocksize
- 1)) == 0) {
807 index
= size
>> PAGE_CACHE_SHIFT
;
809 page
= grab_cache_page(mapping
, index
);
816 ret
= ocfs2_prepare_write_nolock(inode
, page
, offset
, offset
);
822 if (ocfs2_should_order_data(inode
)) {
823 handle
= ocfs2_start_walk_page_trans(inode
, page
, offset
,
825 if (IS_ERR(handle
)) {
826 ret
= PTR_ERR(handle
);
832 /* must not update i_size! */
833 ret
= block_commit_write(page
, offset
, offset
);
840 ocfs2_commit_trans(OCFS2_SB(inode
->i_sb
), handle
);
843 page_cache_release(page
);
848 static int ocfs2_zero_extend(struct inode
*inode
,
853 struct super_block
*sb
= inode
->i_sb
;
855 start_off
= ocfs2_align_bytes_to_blocks(sb
, i_size_read(inode
));
856 while (start_off
< zero_to_size
) {
857 ret
= ocfs2_write_zero_page(inode
, start_off
);
863 start_off
+= sb
->s_blocksize
;
866 * Very large extends have the potential to lock up
867 * the cpu for extended periods of time.
877 * A tail_to_skip value > 0 indicates that we're being called from
878 * ocfs2_file_aio_write(). This has the following implications:
880 * - we don't want to update i_size
881 * - di_bh will be NULL, which is fine because it's only used in the
882 * case where we want to update i_size.
883 * - ocfs2_zero_extend() will then only be filling the hole created
884 * between i_size and the start of the write.
886 static int ocfs2_extend_file(struct inode
*inode
,
887 struct buffer_head
*di_bh
,
892 u32 clusters_to_add
= 0;
894 BUG_ON(!tail_to_skip
&& !di_bh
);
896 /* setattr sometimes calls us like this. */
900 if (i_size_read(inode
) == new_i_size
)
902 BUG_ON(new_i_size
< i_size_read(inode
));
904 if (ocfs2_sparse_alloc(OCFS2_SB(inode
->i_sb
))) {
905 BUG_ON(tail_to_skip
!= 0);
906 goto out_update_size
;
909 clusters_to_add
= ocfs2_clusters_for_bytes(inode
->i_sb
, new_i_size
) -
910 OCFS2_I(inode
)->ip_clusters
;
913 * protect the pages that ocfs2_zero_extend is going to be
914 * pulling into the page cache.. we do this before the
915 * metadata extend so that we don't get into the situation
916 * where we've extended the metadata but can't get the data
919 ret
= ocfs2_data_lock(inode
, 1);
925 if (clusters_to_add
) {
926 ret
= ocfs2_extend_allocation(inode
,
927 OCFS2_I(inode
)->ip_clusters
,
936 * Call this even if we don't add any clusters to the tree. We
937 * still need to zero the area between the old i_size and the
940 ret
= ocfs2_zero_extend(inode
, (u64
)new_i_size
- tail_to_skip
);
948 /* We're being called from ocfs2_setattr() which wants
949 * us to update i_size */
950 ret
= ocfs2_simple_size_update(inode
, di_bh
, new_i_size
);
956 if (!ocfs2_sparse_alloc(OCFS2_SB(inode
->i_sb
)))
957 ocfs2_data_unlock(inode
, 1);
963 int ocfs2_setattr(struct dentry
*dentry
, struct iattr
*attr
)
965 int status
= 0, size_change
;
966 struct inode
*inode
= dentry
->d_inode
;
967 struct super_block
*sb
= inode
->i_sb
;
968 struct ocfs2_super
*osb
= OCFS2_SB(sb
);
969 struct buffer_head
*bh
= NULL
;
970 handle_t
*handle
= NULL
;
972 mlog_entry("(0x%p, '%.*s')\n", dentry
,
973 dentry
->d_name
.len
, dentry
->d_name
.name
);
975 if (attr
->ia_valid
& ATTR_MODE
)
976 mlog(0, "mode change: %d\n", attr
->ia_mode
);
977 if (attr
->ia_valid
& ATTR_UID
)
978 mlog(0, "uid change: %d\n", attr
->ia_uid
);
979 if (attr
->ia_valid
& ATTR_GID
)
980 mlog(0, "gid change: %d\n", attr
->ia_gid
);
981 if (attr
->ia_valid
& ATTR_SIZE
)
982 mlog(0, "size change...\n");
983 if (attr
->ia_valid
& (ATTR_ATIME
| ATTR_MTIME
| ATTR_CTIME
))
984 mlog(0, "time change...\n");
986 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
987 | ATTR_GID | ATTR_UID | ATTR_MODE)
988 if (!(attr
->ia_valid
& OCFS2_VALID_ATTRS
)) {
989 mlog(0, "can't handle attrs: 0x%x\n", attr
->ia_valid
);
993 status
= inode_change_ok(inode
, attr
);
997 size_change
= S_ISREG(inode
->i_mode
) && attr
->ia_valid
& ATTR_SIZE
;
999 status
= ocfs2_rw_lock(inode
, 1);
1006 status
= ocfs2_meta_lock(inode
, &bh
, 1);
1008 if (status
!= -ENOENT
)
1010 goto bail_unlock_rw
;
1013 if (size_change
&& attr
->ia_size
!= i_size_read(inode
)) {
1014 if (i_size_read(inode
) > attr
->ia_size
)
1015 status
= ocfs2_truncate_file(inode
, bh
, attr
->ia_size
);
1017 status
= ocfs2_extend_file(inode
, bh
, attr
->ia_size
, 0);
1019 if (status
!= -ENOSPC
)
1026 handle
= ocfs2_start_trans(osb
, OCFS2_INODE_UPDATE_CREDITS
);
1027 if (IS_ERR(handle
)) {
1028 status
= PTR_ERR(handle
);
1034 * This will intentionally not wind up calling vmtruncate(),
1035 * since all the work for a size change has been done above.
1036 * Otherwise, we could get into problems with truncate as
1037 * ip_alloc_sem is used there to protect against i_size
1040 status
= inode_setattr(inode
, attr
);
1046 status
= ocfs2_mark_inode_dirty(handle
, inode
, bh
);
1051 ocfs2_commit_trans(osb
, handle
);
1053 ocfs2_meta_unlock(inode
, 1);
1056 ocfs2_rw_unlock(inode
, 1);
1065 int ocfs2_getattr(struct vfsmount
*mnt
,
1066 struct dentry
*dentry
,
1069 struct inode
*inode
= dentry
->d_inode
;
1070 struct super_block
*sb
= dentry
->d_inode
->i_sb
;
1071 struct ocfs2_super
*osb
= sb
->s_fs_info
;
1076 err
= ocfs2_inode_revalidate(dentry
);
1083 generic_fillattr(inode
, stat
);
1085 /* We set the blksize from the cluster size for performance */
1086 stat
->blksize
= osb
->s_clustersize
;
1094 int ocfs2_permission(struct inode
*inode
, int mask
, struct nameidata
*nd
)
1100 ret
= ocfs2_meta_lock(inode
, NULL
, 0);
1107 ret
= generic_permission(inode
, mask
, NULL
);
1109 ocfs2_meta_unlock(inode
, 0);
1115 static int __ocfs2_write_remove_suid(struct inode
*inode
,
1116 struct buffer_head
*bh
)
1120 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1121 struct ocfs2_dinode
*di
;
1123 mlog_entry("(Inode %llu, mode 0%o)\n",
1124 (unsigned long long)OCFS2_I(inode
)->ip_blkno
, inode
->i_mode
);
1126 handle
= ocfs2_start_trans(osb
, OCFS2_INODE_UPDATE_CREDITS
);
1127 if (handle
== NULL
) {
1133 ret
= ocfs2_journal_access(handle
, inode
, bh
,
1134 OCFS2_JOURNAL_ACCESS_WRITE
);
1140 inode
->i_mode
&= ~S_ISUID
;
1141 if ((inode
->i_mode
& S_ISGID
) && (inode
->i_mode
& S_IXGRP
))
1142 inode
->i_mode
&= ~S_ISGID
;
1144 di
= (struct ocfs2_dinode
*) bh
->b_data
;
1145 di
->i_mode
= cpu_to_le16(inode
->i_mode
);
1147 ret
= ocfs2_journal_dirty(handle
, bh
);
1152 ocfs2_commit_trans(osb
, handle
);
1159 * Will look for holes and unwritten extents in the range starting at
1160 * pos for count bytes (inclusive).
1162 static int ocfs2_check_range_for_holes(struct inode
*inode
, loff_t pos
,
1166 unsigned int extent_flags
;
1167 u32 cpos
, clusters
, extent_len
, phys_cpos
;
1168 struct super_block
*sb
= inode
->i_sb
;
1170 cpos
= pos
>> OCFS2_SB(sb
)->s_clustersize_bits
;
1171 clusters
= ocfs2_clusters_for_bytes(sb
, pos
+ count
) - cpos
;
1174 ret
= ocfs2_get_clusters(inode
, cpos
, &phys_cpos
, &extent_len
,
1181 if (phys_cpos
== 0 || (extent_flags
& OCFS2_EXT_UNWRITTEN
)) {
1186 if (extent_len
> clusters
)
1187 extent_len
= clusters
;
1189 clusters
-= extent_len
;
1196 static int ocfs2_write_remove_suid(struct inode
*inode
)
1199 struct buffer_head
*bh
= NULL
;
1200 struct ocfs2_inode_info
*oi
= OCFS2_I(inode
);
1202 ret
= ocfs2_read_block(OCFS2_SB(inode
->i_sb
),
1203 oi
->ip_blkno
, &bh
, OCFS2_BH_CACHED
, inode
);
1209 ret
= __ocfs2_write_remove_suid(inode
, bh
);
1216 * Allocate enough extents to cover the region starting at byte offset
1217 * start for len bytes. Existing extents are skipped, any extents
1218 * added are marked as "unwritten".
1220 static int ocfs2_allocate_unwritten_extents(struct inode
*inode
,
1224 u32 cpos
, phys_cpos
, clusters
, alloc_size
;
1227 * We consider both start and len to be inclusive.
1229 cpos
= start
>> OCFS2_SB(inode
->i_sb
)->s_clustersize_bits
;
1230 clusters
= ocfs2_clusters_for_bytes(inode
->i_sb
, start
+ len
);
1234 ret
= ocfs2_get_clusters(inode
, cpos
, &phys_cpos
,
1242 * Hole or existing extent len can be arbitrary, so
1243 * cap it to our own allocation request.
1245 if (alloc_size
> clusters
)
1246 alloc_size
= clusters
;
1250 * We already have an allocation at this
1251 * region so we can safely skip it.
1256 ret
= __ocfs2_extend_allocation(inode
, cpos
, alloc_size
, 1);
1265 clusters
-= alloc_size
;
1273 static int __ocfs2_remove_inode_range(struct inode
*inode
,
1274 struct buffer_head
*di_bh
,
1275 u32 cpos
, u32 phys_cpos
, u32 len
,
1276 struct ocfs2_cached_dealloc_ctxt
*dealloc
)
1279 u64 phys_blkno
= ocfs2_clusters_to_blocks(inode
->i_sb
, phys_cpos
);
1280 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1281 struct inode
*tl_inode
= osb
->osb_tl_inode
;
1283 struct ocfs2_alloc_context
*meta_ac
= NULL
;
1284 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*)di_bh
->b_data
;
1286 ret
= ocfs2_lock_allocators(inode
, di
, 0, 1, NULL
, &meta_ac
);
1292 mutex_lock(&tl_inode
->i_mutex
);
1294 if (ocfs2_truncate_log_needs_flush(osb
)) {
1295 ret
= __ocfs2_flush_truncate_log(osb
);
1302 handle
= ocfs2_start_trans(osb
, OCFS2_REMOVE_EXTENT_CREDITS
);
1303 if (handle
== NULL
) {
1309 ret
= ocfs2_journal_access(handle
, inode
, di_bh
,
1310 OCFS2_JOURNAL_ACCESS_WRITE
);
1316 ret
= ocfs2_remove_extent(inode
, di_bh
, cpos
, len
, handle
, meta_ac
,
1323 OCFS2_I(inode
)->ip_clusters
-= len
;
1324 di
->i_clusters
= cpu_to_le32(OCFS2_I(inode
)->ip_clusters
);
1326 ret
= ocfs2_journal_dirty(handle
, di_bh
);
1332 ret
= ocfs2_truncate_log_append(osb
, handle
, phys_blkno
, len
);
1337 ocfs2_commit_trans(osb
, handle
);
1339 mutex_unlock(&tl_inode
->i_mutex
);
1342 ocfs2_free_alloc_context(meta_ac
);
1348 * Truncate a byte range, avoiding pages within partial clusters. This
1349 * preserves those pages for the zeroing code to write to.
1351 static void ocfs2_truncate_cluster_pages(struct inode
*inode
, u64 byte_start
,
1354 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1356 struct address_space
*mapping
= inode
->i_mapping
;
1358 start
= (loff_t
)ocfs2_align_bytes_to_clusters(inode
->i_sb
, byte_start
);
1359 end
= byte_start
+ byte_len
;
1360 end
= end
& ~(osb
->s_clustersize
- 1);
1363 unmap_mapping_range(mapping
, start
, end
- start
, 0);
1364 truncate_inode_pages_range(mapping
, start
, end
- 1);
1368 static int ocfs2_zero_partial_clusters(struct inode
*inode
,
1372 u64 tmpend
, end
= start
+ len
;
1373 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1374 unsigned int csize
= osb
->s_clustersize
;
1378 * The "start" and "end" values are NOT necessarily part of
1379 * the range whose allocation is being deleted. Rather, this
1380 * is what the user passed in with the request. We must zero
1381 * partial clusters here. There's no need to worry about
1382 * physical allocation - the zeroing code knows to skip holes.
1384 mlog(0, "byte start: %llu, end: %llu\n",
1385 (unsigned long long)start
, (unsigned long long)end
);
1388 * If both edges are on a cluster boundary then there's no
1389 * zeroing required as the region is part of the allocation to
1392 if ((start
& (csize
- 1)) == 0 && (end
& (csize
- 1)) == 0)
1395 handle
= ocfs2_start_trans(osb
, OCFS2_INODE_UPDATE_CREDITS
);
1396 if (handle
== NULL
) {
1403 * We want to get the byte offset of the end of the 1st cluster.
1405 tmpend
= (u64
)osb
->s_clustersize
+ (start
& ~(osb
->s_clustersize
- 1));
1409 mlog(0, "1st range: start: %llu, tmpend: %llu\n",
1410 (unsigned long long)start
, (unsigned long long)tmpend
);
1412 ret
= ocfs2_zero_range_for_truncate(inode
, handle
, start
, tmpend
);
1418 * This may make start and end equal, but the zeroing
1419 * code will skip any work in that case so there's no
1420 * need to catch it up here.
1422 start
= end
& ~(osb
->s_clustersize
- 1);
1424 mlog(0, "2nd range: start: %llu, end: %llu\n",
1425 (unsigned long long)start
, (unsigned long long)end
);
1427 ret
= ocfs2_zero_range_for_truncate(inode
, handle
, start
, end
);
1432 ocfs2_commit_trans(osb
, handle
);
1437 static int ocfs2_remove_inode_range(struct inode
*inode
,
1438 struct buffer_head
*di_bh
, u64 byte_start
,
1442 u32 trunc_start
, trunc_len
, cpos
, phys_cpos
, alloc_size
;
1443 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1444 struct ocfs2_cached_dealloc_ctxt dealloc
;
1446 ocfs2_init_dealloc_ctxt(&dealloc
);
1451 trunc_start
= ocfs2_clusters_for_bytes(osb
->sb
, byte_start
);
1452 trunc_len
= (byte_start
+ byte_len
) >> osb
->s_clustersize_bits
;
1453 if (trunc_len
>= trunc_start
)
1454 trunc_len
-= trunc_start
;
1458 mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u\n",
1459 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
1460 (unsigned long long)byte_start
,
1461 (unsigned long long)byte_len
, trunc_start
, trunc_len
);
1463 ret
= ocfs2_zero_partial_clusters(inode
, byte_start
, byte_len
);
1471 ret
= ocfs2_get_clusters(inode
, cpos
, &phys_cpos
,
1478 if (alloc_size
> trunc_len
)
1479 alloc_size
= trunc_len
;
1481 /* Only do work for non-holes */
1482 if (phys_cpos
!= 0) {
1483 ret
= __ocfs2_remove_inode_range(inode
, di_bh
, cpos
,
1484 phys_cpos
, alloc_size
,
1493 trunc_len
-= alloc_size
;
1496 ocfs2_truncate_cluster_pages(inode
, byte_start
, byte_len
);
1499 ocfs2_schedule_truncate_log_flush(osb
, 1);
1500 ocfs2_run_deallocs(osb
, &dealloc
);
1506 * Parts of this function taken from xfs_change_file_space()
1508 static int __ocfs2_change_file_space(struct file
*file
, struct inode
*inode
,
1509 loff_t f_pos
, unsigned int cmd
,
1510 struct ocfs2_space_resv
*sr
,
1516 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1517 struct buffer_head
*di_bh
= NULL
;
1519 unsigned long long max_off
= ocfs2_max_file_offset(inode
->i_sb
->s_blocksize_bits
);
1521 if (ocfs2_is_hard_readonly(osb
) || ocfs2_is_soft_readonly(osb
))
1524 mutex_lock(&inode
->i_mutex
);
1527 * This prevents concurrent writes on other nodes
1529 ret
= ocfs2_rw_lock(inode
, 1);
1535 ret
= ocfs2_meta_lock(inode
, &di_bh
, 1);
1541 if (inode
->i_flags
& (S_IMMUTABLE
|S_APPEND
)) {
1543 goto out_meta_unlock
;
1546 switch (sr
->l_whence
) {
1547 case 0: /*SEEK_SET*/
1549 case 1: /*SEEK_CUR*/
1550 sr
->l_start
+= f_pos
;
1552 case 2: /*SEEK_END*/
1553 sr
->l_start
+= i_size_read(inode
);
1557 goto out_meta_unlock
;
1561 llen
= sr
->l_len
> 0 ? sr
->l_len
- 1 : sr
->l_len
;
1564 || sr
->l_start
> max_off
1565 || (sr
->l_start
+ llen
) < 0
1566 || (sr
->l_start
+ llen
) > max_off
) {
1568 goto out_meta_unlock
;
1570 size
= sr
->l_start
+ sr
->l_len
;
1572 if (cmd
== OCFS2_IOC_RESVSP
|| cmd
== OCFS2_IOC_RESVSP64
) {
1573 if (sr
->l_len
<= 0) {
1575 goto out_meta_unlock
;
1579 if (file
&& should_remove_suid(file
->f_path
.dentry
)) {
1580 ret
= __ocfs2_write_remove_suid(inode
, di_bh
);
1583 goto out_meta_unlock
;
1587 down_write(&OCFS2_I(inode
)->ip_alloc_sem
);
1589 case OCFS2_IOC_RESVSP
:
1590 case OCFS2_IOC_RESVSP64
:
1592 * This takes unsigned offsets, but the signed ones we
1593 * pass have been checked against overflow above.
1595 ret
= ocfs2_allocate_unwritten_extents(inode
, sr
->l_start
,
1598 case OCFS2_IOC_UNRESVSP
:
1599 case OCFS2_IOC_UNRESVSP64
:
1600 ret
= ocfs2_remove_inode_range(inode
, di_bh
, sr
->l_start
,
1606 up_write(&OCFS2_I(inode
)->ip_alloc_sem
);
1609 goto out_meta_unlock
;
1613 * We update c/mtime for these changes
1615 handle
= ocfs2_start_trans(osb
, OCFS2_INODE_UPDATE_CREDITS
);
1616 if (IS_ERR(handle
)) {
1617 ret
= PTR_ERR(handle
);
1619 goto out_meta_unlock
;
1622 if (change_size
&& i_size_read(inode
) < size
)
1623 i_size_write(inode
, size
);
1625 inode
->i_ctime
= inode
->i_mtime
= CURRENT_TIME
;
1626 ret
= ocfs2_mark_inode_dirty(handle
, inode
, di_bh
);
1630 ocfs2_commit_trans(osb
, handle
);
1634 ocfs2_meta_unlock(inode
, 1);
1636 ocfs2_rw_unlock(inode
, 1);
1638 mutex_unlock(&inode
->i_mutex
);
1643 int ocfs2_change_file_space(struct file
*file
, unsigned int cmd
,
1644 struct ocfs2_space_resv
*sr
)
1646 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1647 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);;
1649 if ((cmd
== OCFS2_IOC_RESVSP
|| cmd
== OCFS2_IOC_RESVSP64
) &&
1650 !ocfs2_writes_unwritten_extents(osb
))
1652 else if ((cmd
== OCFS2_IOC_UNRESVSP
|| cmd
== OCFS2_IOC_UNRESVSP64
) &&
1653 !ocfs2_sparse_alloc(osb
))
1656 if (!S_ISREG(inode
->i_mode
))
1659 if (!(file
->f_mode
& FMODE_WRITE
))
1662 return __ocfs2_change_file_space(file
, inode
, file
->f_pos
, cmd
, sr
, 0);
1665 static long ocfs2_fallocate(struct inode
*inode
, int mode
, loff_t offset
,
1668 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1669 struct ocfs2_space_resv sr
;
1670 int change_size
= 1;
1672 if (!ocfs2_writes_unwritten_extents(osb
))
1675 if (S_ISDIR(inode
->i_mode
))
1678 if (mode
& FALLOC_FL_KEEP_SIZE
)
1682 sr
.l_start
= (s64
)offset
;
1683 sr
.l_len
= (s64
)len
;
1685 return __ocfs2_change_file_space(NULL
, inode
, offset
,
1686 OCFS2_IOC_RESVSP64
, &sr
, change_size
);
1689 static int ocfs2_prepare_inode_for_write(struct dentry
*dentry
,
1695 int ret
= 0, meta_level
= appending
;
1696 struct inode
*inode
= dentry
->d_inode
;
1698 loff_t newsize
, saved_pos
;
1701 * We sample i_size under a read level meta lock to see if our write
1702 * is extending the file, if it is we back off and get a write level
1706 ret
= ocfs2_meta_lock(inode
, NULL
, meta_level
);
1713 /* Clear suid / sgid if necessary. We do this here
1714 * instead of later in the write path because
1715 * remove_suid() calls ->setattr without any hint that
1716 * we may have already done our cluster locking. Since
1717 * ocfs2_setattr() *must* take cluster locks to
1718 * proceeed, this will lead us to recursively lock the
1719 * inode. There's also the dinode i_size state which
1720 * can be lost via setattr during extending writes (we
1721 * set inode->i_size at the end of a write. */
1722 if (should_remove_suid(dentry
)) {
1723 if (meta_level
== 0) {
1724 ocfs2_meta_unlock(inode
, meta_level
);
1729 ret
= ocfs2_write_remove_suid(inode
);
1736 /* work on a copy of ppos until we're sure that we won't have
1737 * to recalculate it due to relocking. */
1739 saved_pos
= i_size_read(inode
);
1740 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos
);
1745 if (ocfs2_sparse_alloc(OCFS2_SB(inode
->i_sb
))) {
1746 loff_t end
= saved_pos
+ count
;
1749 * Skip the O_DIRECT checks if we don't need
1752 if (!direct_io
|| !(*direct_io
))
1756 * Allowing concurrent direct writes means
1757 * i_size changes wouldn't be synchronized, so
1758 * one node could wind up truncating another
1761 if (end
> i_size_read(inode
)) {
1767 * We don't fill holes during direct io, so
1768 * check for them here. If any are found, the
1769 * caller will have to retake some cluster
1770 * locks and initiate the io as buffered.
1772 ret
= ocfs2_check_range_for_holes(inode
, saved_pos
,
1783 * The rest of this loop is concerned with legacy file
1784 * systems which don't support sparse files.
1787 newsize
= count
+ saved_pos
;
1789 mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
1790 (long long) saved_pos
, (long long) newsize
,
1791 (long long) i_size_read(inode
));
1793 /* No need for a higher level metadata lock if we're
1794 * never going past i_size. */
1795 if (newsize
<= i_size_read(inode
))
1798 if (meta_level
== 0) {
1799 ocfs2_meta_unlock(inode
, meta_level
);
1804 spin_lock(&OCFS2_I(inode
)->ip_lock
);
1805 clusters
= ocfs2_clusters_for_bytes(inode
->i_sb
, newsize
) -
1806 OCFS2_I(inode
)->ip_clusters
;
1807 spin_unlock(&OCFS2_I(inode
)->ip_lock
);
1809 mlog(0, "Writing at EOF, may need more allocation: "
1810 "i_size = %lld, newsize = %lld, need %u clusters\n",
1811 (long long) i_size_read(inode
), (long long) newsize
,
1814 /* We only want to continue the rest of this loop if
1815 * our extend will actually require more
1820 ret
= ocfs2_extend_file(inode
, NULL
, newsize
, count
);
1833 ocfs2_meta_unlock(inode
, meta_level
);
1840 ocfs2_set_next_iovec(const struct iovec
**iovp
, size_t *basep
, size_t bytes
)
1842 const struct iovec
*iov
= *iovp
;
1843 size_t base
= *basep
;
1846 int copy
= min(bytes
, iov
->iov_len
- base
);
1850 if (iov
->iov_len
== base
) {
1859 static struct page
* ocfs2_get_write_source(char **ret_src_buf
,
1860 const struct iovec
*cur_iov
,
1864 char *buf
= cur_iov
->iov_base
+ iov_offset
;
1865 struct page
*src_page
= NULL
;
1868 off
= (unsigned long)(buf
) & ~PAGE_CACHE_MASK
;
1870 if (!segment_eq(get_fs(), KERNEL_DS
)) {
1872 * Pull in the user page. We want to do this outside
1873 * of the meta data locks in order to preserve locking
1874 * order in case of page fault.
1876 ret
= get_user_pages(current
, current
->mm
,
1877 (unsigned long)buf
& PAGE_CACHE_MASK
, 1,
1878 0, 0, &src_page
, NULL
);
1880 *ret_src_buf
= kmap(src_page
) + off
;
1882 src_page
= ERR_PTR(-EFAULT
);
1890 static void ocfs2_put_write_source(struct page
*page
)
1894 page_cache_release(page
);
1898 static ssize_t
ocfs2_file_buffered_write(struct file
*file
, loff_t
*ppos
,
1899 const struct iovec
*iov
,
1900 unsigned long nr_segs
,
1902 ssize_t o_direct_written
)
1905 ssize_t copied
, total
= 0;
1906 size_t iov_offset
= 0, bytes
;
1908 const struct iovec
*cur_iov
= iov
;
1909 struct page
*user_page
, *page
;
1910 char * uninitialized_var(buf
);
1915 * handle partial DIO write. Adjust cur_iov if needed.
1917 ocfs2_set_next_iovec(&cur_iov
, &iov_offset
, o_direct_written
);
1922 user_page
= ocfs2_get_write_source(&buf
, cur_iov
, iov_offset
);
1923 if (IS_ERR(user_page
)) {
1924 ret
= PTR_ERR(user_page
);
1928 /* Stay within our page boundaries */
1929 bytes
= min((PAGE_CACHE_SIZE
- ((unsigned long)pos
& ~PAGE_CACHE_MASK
)),
1930 (PAGE_CACHE_SIZE
- ((unsigned long)buf
& ~PAGE_CACHE_MASK
)));
1931 /* Stay within the vector boundary */
1932 bytes
= min_t(size_t, bytes
, cur_iov
->iov_len
- iov_offset
);
1933 /* Stay within count */
1934 bytes
= min(bytes
, count
);
1937 ret
= ocfs2_write_begin(file
, file
->f_mapping
, pos
, bytes
, 0,
1944 dst
= kmap_atomic(page
, KM_USER0
);
1945 memcpy(dst
+ (pos
& (PAGE_CACHE_SIZE
- 1)), buf
, bytes
);
1946 kunmap_atomic(dst
, KM_USER0
);
1947 flush_dcache_page(page
);
1948 ocfs2_put_write_source(user_page
);
1950 copied
= ocfs2_write_end(file
, file
->f_mapping
, pos
, bytes
,
1951 bytes
, page
, fsdata
);
1959 *ppos
= pos
+ copied
;
1962 ocfs2_set_next_iovec(&cur_iov
, &iov_offset
, copied
);
1966 return total
? total
: ret
;
1969 static ssize_t
ocfs2_file_aio_write(struct kiocb
*iocb
,
1970 const struct iovec
*iov
,
1971 unsigned long nr_segs
,
1974 int ret
, direct_io
, appending
, rw_level
, have_alloc_sem
= 0;
1975 int can_do_direct
, sync
= 0;
1976 ssize_t written
= 0;
1977 size_t ocount
; /* original count */
1978 size_t count
; /* after file limit checks */
1979 loff_t
*ppos
= &iocb
->ki_pos
;
1980 struct file
*file
= iocb
->ki_filp
;
1981 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1983 mlog_entry("(0x%p, %u, '%.*s')\n", file
,
1984 (unsigned int)nr_segs
,
1985 file
->f_path
.dentry
->d_name
.len
,
1986 file
->f_path
.dentry
->d_name
.name
);
1988 if (iocb
->ki_left
== 0)
1991 ret
= generic_segment_checks(iov
, &nr_segs
, &ocount
, VERIFY_READ
);
1997 vfs_check_frozen(inode
->i_sb
, SB_FREEZE_WRITE
);
1999 appending
= file
->f_flags
& O_APPEND
? 1 : 0;
2000 direct_io
= file
->f_flags
& O_DIRECT
? 1 : 0;
2002 mutex_lock(&inode
->i_mutex
);
2005 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
2007 down_read(&inode
->i_alloc_sem
);
2011 /* concurrent O_DIRECT writes are allowed */
2012 rw_level
= !direct_io
;
2013 ret
= ocfs2_rw_lock(inode
, rw_level
);
2019 can_do_direct
= direct_io
;
2020 ret
= ocfs2_prepare_inode_for_write(file
->f_path
.dentry
, ppos
,
2021 iocb
->ki_left
, appending
,
2029 * We can't complete the direct I/O as requested, fall back to
2032 if (direct_io
&& !can_do_direct
) {
2033 ocfs2_rw_unlock(inode
, rw_level
);
2034 up_read(&inode
->i_alloc_sem
);
2044 if (!sync
&& ((file
->f_flags
& O_SYNC
) || IS_SYNC(inode
)))
2048 * XXX: Is it ok to execute these checks a second time?
2050 ret
= generic_write_checks(file
, ppos
, &count
, S_ISBLK(inode
->i_mode
));
2055 * Set pos so that sync_page_range_nolock() below understands
2056 * where to start from. We might've moved it around via the
2057 * calls above. The range we want to actually sync starts from
2063 /* communicate with ocfs2_dio_end_io */
2064 ocfs2_iocb_set_rw_locked(iocb
, rw_level
);
2067 written
= generic_file_direct_write(iocb
, iov
, &nr_segs
, *ppos
,
2068 ppos
, count
, ocount
);
2074 written
= ocfs2_file_buffered_write(file
, ppos
, iov
, nr_segs
,
2078 if (ret
!= -EFAULT
|| ret
!= -ENOSPC
)
2085 /* buffered aio wouldn't have proper lock coverage today */
2086 BUG_ON(ret
== -EIOCBQUEUED
&& !(file
->f_flags
& O_DIRECT
));
2089 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2090 * function pointer which is called when o_direct io completes so that
2091 * it can unlock our rw lock. (it's the clustered equivalent of
2092 * i_alloc_sem; protects truncate from racing with pending ios).
2093 * Unfortunately there are error cases which call end_io and others
2094 * that don't. so we don't have to unlock the rw_lock if either an
2095 * async dio is going to do it in the future or an end_io after an
2096 * error has already done it.
2098 if (ret
== -EIOCBQUEUED
|| !ocfs2_iocb_is_rw_locked(iocb
)) {
2105 ocfs2_rw_unlock(inode
, rw_level
);
2109 up_read(&inode
->i_alloc_sem
);
2111 if (written
> 0 && sync
) {
2114 err
= sync_page_range_nolock(inode
, file
->f_mapping
, pos
, count
);
2119 mutex_unlock(&inode
->i_mutex
);
2122 return written
? written
: ret
;
2125 static int ocfs2_splice_write_actor(struct pipe_inode_info
*pipe
,
2126 struct pipe_buffer
*buf
,
2127 struct splice_desc
*sd
)
2131 struct file
*file
= sd
->u
.file
;
2132 unsigned int offset
;
2133 struct page
*page
= NULL
;
2137 ret
= buf
->ops
->confirm(pipe
, buf
);
2141 offset
= sd
->pos
& ~PAGE_CACHE_MASK
;
2143 if (count
+ offset
> PAGE_CACHE_SIZE
)
2144 count
= PAGE_CACHE_SIZE
- offset
;
2146 ret
= ocfs2_write_begin(file
, file
->f_mapping
, sd
->pos
, count
, 0,
2153 src
= buf
->ops
->map(pipe
, buf
, 1);
2154 dst
= kmap_atomic(page
, KM_USER1
);
2155 memcpy(dst
+ offset
, src
+ buf
->offset
, count
);
2156 kunmap_atomic(dst
, KM_USER1
);
2157 buf
->ops
->unmap(pipe
, buf
, src
);
2159 copied
= ocfs2_write_end(file
, file
->f_mapping
, sd
->pos
, count
, count
,
2168 return copied
? copied
: ret
;
2171 static ssize_t
__ocfs2_file_splice_write(struct pipe_inode_info
*pipe
,
2178 struct address_space
*mapping
= out
->f_mapping
;
2179 struct inode
*inode
= mapping
->host
;
2180 struct splice_desc sd
= {
2187 ret
= __splice_from_pipe(pipe
, &sd
, ocfs2_splice_write_actor
);
2191 if (unlikely((out
->f_flags
& O_SYNC
) || IS_SYNC(inode
))) {
2192 err
= generic_osync_inode(inode
, mapping
,
2193 OSYNC_METADATA
|OSYNC_DATA
);
2202 static ssize_t
ocfs2_file_splice_write(struct pipe_inode_info
*pipe
,
2209 struct inode
*inode
= out
->f_path
.dentry
->d_inode
;
2211 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out
, pipe
,
2213 out
->f_path
.dentry
->d_name
.len
,
2214 out
->f_path
.dentry
->d_name
.name
);
2216 inode_double_lock(inode
, pipe
->inode
);
2218 ret
= ocfs2_rw_lock(inode
, 1);
2224 ret
= ocfs2_prepare_inode_for_write(out
->f_path
.dentry
, ppos
, len
, 0,
2231 /* ok, we're done with i_size and alloc work */
2232 ret
= __ocfs2_file_splice_write(pipe
, out
, ppos
, len
, flags
);
2235 ocfs2_rw_unlock(inode
, 1);
2237 inode_double_unlock(inode
, pipe
->inode
);
2243 static ssize_t
ocfs2_file_splice_read(struct file
*in
,
2245 struct pipe_inode_info
*pipe
,
2250 struct inode
*inode
= in
->f_path
.dentry
->d_inode
;
2252 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in
, pipe
,
2254 in
->f_path
.dentry
->d_name
.len
,
2255 in
->f_path
.dentry
->d_name
.name
);
2258 * See the comment in ocfs2_file_aio_read()
2260 ret
= ocfs2_meta_lock(inode
, NULL
, 0);
2265 ocfs2_meta_unlock(inode
, 0);
2267 ret
= generic_file_splice_read(in
, ppos
, pipe
, len
, flags
);
2274 static ssize_t
ocfs2_file_aio_read(struct kiocb
*iocb
,
2275 const struct iovec
*iov
,
2276 unsigned long nr_segs
,
2279 int ret
= 0, rw_level
= -1, have_alloc_sem
= 0, lock_level
= 0;
2280 struct file
*filp
= iocb
->ki_filp
;
2281 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
2283 mlog_entry("(0x%p, %u, '%.*s')\n", filp
,
2284 (unsigned int)nr_segs
,
2285 filp
->f_path
.dentry
->d_name
.len
,
2286 filp
->f_path
.dentry
->d_name
.name
);
2295 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
2296 * need locks to protect pending reads from racing with truncate.
2298 if (filp
->f_flags
& O_DIRECT
) {
2299 down_read(&inode
->i_alloc_sem
);
2302 ret
= ocfs2_rw_lock(inode
, 0);
2308 /* communicate with ocfs2_dio_end_io */
2309 ocfs2_iocb_set_rw_locked(iocb
, rw_level
);
2313 * We're fine letting folks race truncates and extending
2314 * writes with read across the cluster, just like they can
2315 * locally. Hence no rw_lock during read.
2317 * Take and drop the meta data lock to update inode fields
2318 * like i_size. This allows the checks down below
2319 * generic_file_aio_read() a chance of actually working.
2321 ret
= ocfs2_meta_lock_atime(inode
, filp
->f_vfsmnt
, &lock_level
);
2326 ocfs2_meta_unlock(inode
, lock_level
);
2328 ret
= generic_file_aio_read(iocb
, iov
, nr_segs
, iocb
->ki_pos
);
2330 mlog(ML_ERROR
, "generic_file_aio_read returned -EINVAL\n");
2332 /* buffered aio wouldn't have proper lock coverage today */
2333 BUG_ON(ret
== -EIOCBQUEUED
&& !(filp
->f_flags
& O_DIRECT
));
2335 /* see ocfs2_file_aio_write */
2336 if (ret
== -EIOCBQUEUED
|| !ocfs2_iocb_is_rw_locked(iocb
)) {
2343 up_read(&inode
->i_alloc_sem
);
2345 ocfs2_rw_unlock(inode
, rw_level
);
2351 const struct inode_operations ocfs2_file_iops
= {
2352 .setattr
= ocfs2_setattr
,
2353 .getattr
= ocfs2_getattr
,
2354 .permission
= ocfs2_permission
,
2355 .fallocate
= ocfs2_fallocate
,
2358 const struct inode_operations ocfs2_special_file_iops
= {
2359 .setattr
= ocfs2_setattr
,
2360 .getattr
= ocfs2_getattr
,
2361 .permission
= ocfs2_permission
,
2364 const struct file_operations ocfs2_fops
= {
2365 .read
= do_sync_read
,
2366 .write
= do_sync_write
,
2368 .fsync
= ocfs2_sync_file
,
2369 .release
= ocfs2_file_release
,
2370 .open
= ocfs2_file_open
,
2371 .aio_read
= ocfs2_file_aio_read
,
2372 .aio_write
= ocfs2_file_aio_write
,
2373 .ioctl
= ocfs2_ioctl
,
2374 #ifdef CONFIG_COMPAT
2375 .compat_ioctl
= ocfs2_compat_ioctl
,
2377 .splice_read
= ocfs2_file_splice_read
,
2378 .splice_write
= ocfs2_file_splice_write
,
2381 const struct file_operations ocfs2_dops
= {
2382 .read
= generic_read_dir
,
2383 .readdir
= ocfs2_readdir
,
2384 .fsync
= ocfs2_sync_file
,
2385 .ioctl
= ocfs2_ioctl
,
2386 #ifdef CONFIG_COMPAT
2387 .compat_ioctl
= ocfs2_compat_ioctl
,