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>
35 #define MLOG_MASK_PREFIX ML_INODE
36 #include <cluster/masklog.h>
44 #include "extent_map.h"
54 #include "buffer_head_io.h"
56 static int ocfs2_sync_inode(struct inode *inode)
58 filemap_fdatawrite(inode->i_mapping);
59 return sync_mapping_buffers(inode->i_mapping);
62 static int ocfs2_file_open(struct inode *inode, struct file *file)
65 int mode = file->f_flags;
66 struct ocfs2_inode_info *oi = OCFS2_I(inode);
68 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
69 file->f_dentry->d_name.len, file->f_dentry->d_name.name);
71 spin_lock(&oi->ip_lock);
73 /* Check that the inode hasn't been wiped from disk by another
74 * node. If it hasn't then we're safe as long as we hold the
75 * spin lock until our increment of open count. */
76 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
77 spin_unlock(&oi->ip_lock);
84 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
87 spin_unlock(&oi->ip_lock);
94 static int ocfs2_file_release(struct inode *inode, struct file *file)
96 struct ocfs2_inode_info *oi = OCFS2_I(inode);
98 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
99 file->f_dentry->d_name.len,
100 file->f_dentry->d_name.name);
102 spin_lock(&oi->ip_lock);
103 if (!--oi->ip_open_count)
104 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
105 spin_unlock(&oi->ip_lock);
112 static int ocfs2_sync_file(struct file *file,
113 struct dentry *dentry,
118 struct inode *inode = dentry->d_inode;
119 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
121 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync,
122 dentry->d_name.len, dentry->d_name.name);
124 err = ocfs2_sync_inode(dentry->d_inode);
128 journal = osb->journal->j_journal;
129 err = journal_force_commit(journal);
134 return (err < 0) ? -EIO : 0;
137 int ocfs2_set_inode_size(struct ocfs2_journal_handle *handle,
139 struct buffer_head *fe_bh,
145 i_size_write(inode, new_i_size);
146 inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size);
147 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
149 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
160 static int ocfs2_simple_size_update(struct inode *inode,
161 struct buffer_head *di_bh,
165 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
166 struct ocfs2_journal_handle *handle = NULL;
168 handle = ocfs2_start_trans(osb, NULL,
169 OCFS2_INODE_UPDATE_CREDITS);
170 if (handle == NULL) {
176 ret = ocfs2_set_inode_size(handle, inode, di_bh,
181 ocfs2_commit_trans(handle);
186 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
188 struct buffer_head *fe_bh,
192 struct ocfs2_journal_handle *handle;
196 /* TODO: This needs to actually orphan the inode in this
199 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
200 if (IS_ERR(handle)) {
201 status = PTR_ERR(handle);
206 status = ocfs2_set_inode_size(handle, inode, fe_bh, new_i_size);
210 ocfs2_commit_trans(handle);
216 static int ocfs2_truncate_file(struct inode *inode,
217 struct buffer_head *di_bh,
221 struct ocfs2_dinode *fe = NULL;
222 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
223 struct ocfs2_truncate_context *tc = NULL;
225 mlog_entry("(inode = %llu, new_i_size = %llu\n",
226 (unsigned long long)OCFS2_I(inode)->ip_blkno,
227 (unsigned long long)new_i_size);
229 truncate_inode_pages(inode->i_mapping, new_i_size);
231 fe = (struct ocfs2_dinode *) di_bh->b_data;
232 if (!OCFS2_IS_VALID_DINODE(fe)) {
233 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
238 mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
239 "Inode %llu, inode i_size = %lld != di "
240 "i_size = %llu, i_flags = 0x%x\n",
241 (unsigned long long)OCFS2_I(inode)->ip_blkno,
243 (unsigned long long)le64_to_cpu(fe->i_size),
244 le32_to_cpu(fe->i_flags));
246 if (new_i_size > le64_to_cpu(fe->i_size)) {
247 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
248 (unsigned long long)le64_to_cpu(fe->i_size),
249 (unsigned long long)new_i_size);
255 mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
256 (unsigned long long)le64_to_cpu(fe->i_blkno),
257 (unsigned long long)le64_to_cpu(fe->i_size),
258 (unsigned long long)new_i_size);
260 /* lets handle the simple truncate cases before doing any more
261 * cluster locking. */
262 if (new_i_size == le64_to_cpu(fe->i_size))
265 /* This forces other nodes to sync and drop their pages. Do
266 * this even if we have a truncate without allocation change -
267 * ocfs2 cluster sizes can be much greater than page size, so
268 * we have to truncate them anyway. */
269 status = ocfs2_data_lock(inode, 1);
274 ocfs2_data_unlock(inode, 1);
276 if (le32_to_cpu(fe->i_clusters) ==
277 ocfs2_clusters_for_bytes(osb->sb, new_i_size)) {
278 mlog(0, "fe->i_clusters = %u, so we do a simple truncate\n",
280 /* No allocation change is required, so lets fast path
282 status = ocfs2_simple_size_update(inode, di_bh, new_i_size);
288 /* alright, we're going to need to do a full blown alloc size
289 * change. Orphan the inode so that recovery can complete the
290 * truncate if necessary. This does the task of marking
292 status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
298 status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
304 status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
310 /* TODO: orphan dir cleanup here. */
318 * extend allocation only here.
319 * we'll update all the disk stuff, and oip->alloc_size
321 * expect stuff to be locked, a transaction started and enough data /
322 * metadata reservations in the contexts.
324 * Will return -EAGAIN, and a reason if a restart is needed.
325 * If passed in, *reason will always be set, even in error.
327 int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
330 struct buffer_head *fe_bh,
331 struct ocfs2_journal_handle *handle,
332 struct ocfs2_alloc_context *data_ac,
333 struct ocfs2_alloc_context *meta_ac,
334 enum ocfs2_alloc_restarted *reason_ret)
338 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
339 enum ocfs2_alloc_restarted reason = RESTART_NONE;
340 u32 bit_off, num_bits;
343 BUG_ON(!clusters_to_add);
345 free_extents = ocfs2_num_free_extents(osb, inode, fe);
346 if (free_extents < 0) {
347 status = free_extents;
352 /* there are two cases which could cause us to EAGAIN in the
353 * we-need-more-metadata case:
354 * 1) we haven't reserved *any*
355 * 2) we are so fragmented, we've needed to add metadata too
357 if (!free_extents && !meta_ac) {
358 mlog(0, "we haven't reserved any metadata!\n");
360 reason = RESTART_META;
362 } else if ((!free_extents)
363 && (ocfs2_alloc_context_bits_left(meta_ac)
364 < ocfs2_extend_meta_needed(fe))) {
365 mlog(0, "filesystem is really fragmented...\n");
367 reason = RESTART_META;
371 status = ocfs2_claim_clusters(osb, handle, data_ac, 1,
372 &bit_off, &num_bits);
374 if (status != -ENOSPC)
379 BUG_ON(num_bits > clusters_to_add);
381 /* reserve our write early -- insert_extent may update the inode */
382 status = ocfs2_journal_access(handle, inode, fe_bh,
383 OCFS2_JOURNAL_ACCESS_WRITE);
389 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
390 mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
391 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
392 status = ocfs2_insert_extent(osb, handle, inode, fe_bh, block,
399 le32_add_cpu(&fe->i_clusters, num_bits);
400 spin_lock(&OCFS2_I(inode)->ip_lock);
401 OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
402 spin_unlock(&OCFS2_I(inode)->ip_lock);
404 status = ocfs2_journal_dirty(handle, fe_bh);
410 clusters_to_add -= num_bits;
412 if (clusters_to_add) {
413 mlog(0, "need to alloc once more, clusters = %u, wanted = "
414 "%u\n", fe->i_clusters, clusters_to_add);
416 reason = RESTART_TRANS;
422 *reason_ret = reason;
426 static int ocfs2_extend_allocation(struct inode *inode,
430 int restart_func = 0;
431 int drop_alloc_sem = 0;
432 int credits, num_free_extents;
434 struct buffer_head *bh = NULL;
435 struct ocfs2_dinode *fe = NULL;
436 struct ocfs2_journal_handle *handle = NULL;
437 struct ocfs2_alloc_context *data_ac = NULL;
438 struct ocfs2_alloc_context *meta_ac = NULL;
439 enum ocfs2_alloc_restarted why;
440 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
442 mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
444 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
445 OCFS2_BH_CACHED, inode);
451 fe = (struct ocfs2_dinode *) bh->b_data;
452 if (!OCFS2_IS_VALID_DINODE(fe)) {
453 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
459 BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
461 mlog(0, "extend inode %llu, i_size = %lld, fe->i_clusters = %u, "
462 "clusters_to_add = %u\n",
463 (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode),
464 fe->i_clusters, clusters_to_add);
466 handle = ocfs2_alloc_handle(osb);
467 if (handle == NULL) {
473 num_free_extents = ocfs2_num_free_extents(osb,
476 if (num_free_extents < 0) {
477 status = num_free_extents;
482 if (!num_free_extents) {
483 status = ocfs2_reserve_new_metadata(osb,
488 if (status != -ENOSPC)
494 status = ocfs2_reserve_clusters(osb,
499 if (status != -ENOSPC)
504 /* blocks peope in read/write from reading our allocation
505 * until we're done changing it. We depend on i_mutex to block
506 * other extend/truncate calls while we're here. Ordering wrt
507 * start_trans is important here -- always do it before! */
508 down_write(&OCFS2_I(inode)->ip_alloc_sem);
511 credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
512 handle = ocfs2_start_trans(osb, handle, credits);
513 if (IS_ERR(handle)) {
514 status = PTR_ERR(handle);
520 restarted_transaction:
521 /* reserve a write to the file entry early on - that we if we
522 * run out of credits in the allocation path, we can still
524 status = ocfs2_journal_access(handle, inode, bh,
525 OCFS2_JOURNAL_ACCESS_WRITE);
531 prev_clusters = OCFS2_I(inode)->ip_clusters;
533 status = ocfs2_do_extend_allocation(osb,
541 if ((status < 0) && (status != -EAGAIN)) {
542 if (status != -ENOSPC)
547 status = ocfs2_journal_dirty(handle, bh);
553 spin_lock(&OCFS2_I(inode)->ip_lock);
554 clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
555 spin_unlock(&OCFS2_I(inode)->ip_lock);
557 if (why != RESTART_NONE && clusters_to_add) {
558 if (why == RESTART_META) {
559 mlog(0, "restarting function.\n");
562 BUG_ON(why != RESTART_TRANS);
564 mlog(0, "restarting transaction.\n");
565 /* TODO: This can be more intelligent. */
566 credits = ocfs2_calc_extend_credits(osb->sb,
569 status = ocfs2_extend_trans(handle->k_handle, credits);
571 /* handle still has to be committed at
577 goto restarted_transaction;
581 mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
582 fe->i_clusters, (unsigned long long)fe->i_size);
583 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
584 OCFS2_I(inode)->ip_clusters, i_size_read(inode));
587 if (drop_alloc_sem) {
588 up_write(&OCFS2_I(inode)->ip_alloc_sem);
592 ocfs2_commit_trans(handle);
596 ocfs2_free_alloc_context(data_ac);
600 ocfs2_free_alloc_context(meta_ac);
603 if ((!status) && restart_func) {
616 /* Some parts of this taken from generic_cont_expand, which turned out
617 * to be too fragile to do exactly what we need without us having to
618 * worry about recursive locking in ->prepare_write() and
619 * ->commit_write(). */
620 static int ocfs2_write_zero_page(struct inode *inode,
623 struct address_space *mapping = inode->i_mapping;
627 struct ocfs2_journal_handle *handle = NULL;
630 offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
631 /* ugh. in prepare/commit_write, if from==to==start of block, we
632 ** skip the prepare. make sure we never send an offset for the start
635 if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
638 index = size >> PAGE_CACHE_SHIFT;
640 page = grab_cache_page(mapping, index);
647 ret = ocfs2_prepare_write_nolock(inode, page, offset, offset);
653 if (ocfs2_should_order_data(inode)) {
654 handle = ocfs2_start_walk_page_trans(inode, page, offset,
656 if (IS_ERR(handle)) {
657 ret = PTR_ERR(handle);
663 /* must not update i_size! */
664 ret = block_commit_write(page, offset, offset);
671 ocfs2_commit_trans(handle);
674 page_cache_release(page);
679 static int ocfs2_zero_extend(struct inode *inode,
684 struct super_block *sb = inode->i_sb;
686 start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
687 while (start_off < zero_to_size) {
688 ret = ocfs2_write_zero_page(inode, start_off);
694 start_off += sb->s_blocksize;
697 * Very large extends have the potential to lock up
698 * the cpu for extended periods of time.
708 * A tail_to_skip value > 0 indicates that we're being called from
709 * ocfs2_file_aio_write(). This has the following implications:
711 * - we don't want to update i_size
712 * - di_bh will be NULL, which is fine because it's only used in the
713 * case where we want to update i_size.
714 * - ocfs2_zero_extend() will then only be filling the hole created
715 * between i_size and the start of the write.
717 static int ocfs2_extend_file(struct inode *inode,
718 struct buffer_head *di_bh,
725 BUG_ON(!tail_to_skip && !di_bh);
727 /* setattr sometimes calls us like this. */
731 if (i_size_read(inode) == new_i_size)
733 BUG_ON(new_i_size < i_size_read(inode));
735 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) -
736 OCFS2_I(inode)->ip_clusters;
739 * protect the pages that ocfs2_zero_extend is going to be
740 * pulling into the page cache.. we do this before the
741 * metadata extend so that we don't get into the situation
742 * where we've extended the metadata but can't get the data
745 ret = ocfs2_data_lock(inode, 1);
751 if (clusters_to_add) {
752 ret = ocfs2_extend_allocation(inode, clusters_to_add);
760 * Call this even if we don't add any clusters to the tree. We
761 * still need to zero the area between the old i_size and the
764 ret = ocfs2_zero_extend(inode, (u64)new_i_size - tail_to_skip);
771 /* We're being called from ocfs2_setattr() which wants
772 * us to update i_size */
773 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
779 ocfs2_data_unlock(inode, 1);
785 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
787 int status = 0, size_change;
788 struct inode *inode = dentry->d_inode;
789 struct super_block *sb = inode->i_sb;
790 struct ocfs2_super *osb = OCFS2_SB(sb);
791 struct buffer_head *bh = NULL;
792 struct ocfs2_journal_handle *handle = NULL;
794 mlog_entry("(0x%p, '%.*s')\n", dentry,
795 dentry->d_name.len, dentry->d_name.name);
797 if (attr->ia_valid & ATTR_MODE)
798 mlog(0, "mode change: %d\n", attr->ia_mode);
799 if (attr->ia_valid & ATTR_UID)
800 mlog(0, "uid change: %d\n", attr->ia_uid);
801 if (attr->ia_valid & ATTR_GID)
802 mlog(0, "gid change: %d\n", attr->ia_gid);
803 if (attr->ia_valid & ATTR_SIZE)
804 mlog(0, "size change...\n");
805 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
806 mlog(0, "time change...\n");
808 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
809 | ATTR_GID | ATTR_UID | ATTR_MODE)
810 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
811 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
815 status = inode_change_ok(inode, attr);
819 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
821 status = ocfs2_rw_lock(inode, 1);
828 status = ocfs2_meta_lock(inode, NULL, &bh, 1);
830 if (status != -ENOENT)
835 if (size_change && attr->ia_size != i_size_read(inode)) {
836 if (i_size_read(inode) > attr->ia_size)
837 status = ocfs2_truncate_file(inode, bh, attr->ia_size);
839 status = ocfs2_extend_file(inode, bh, attr->ia_size, 0);
841 if (status != -ENOSPC)
848 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
849 if (IS_ERR(handle)) {
850 status = PTR_ERR(handle);
855 status = inode_setattr(inode, attr);
861 status = ocfs2_mark_inode_dirty(handle, inode, bh);
866 ocfs2_commit_trans(handle);
868 ocfs2_meta_unlock(inode, 1);
871 ocfs2_rw_unlock(inode, 1);
880 int ocfs2_getattr(struct vfsmount *mnt,
881 struct dentry *dentry,
884 struct inode *inode = dentry->d_inode;
885 struct super_block *sb = dentry->d_inode->i_sb;
886 struct ocfs2_super *osb = sb->s_fs_info;
891 err = ocfs2_inode_revalidate(dentry);
898 generic_fillattr(inode, stat);
900 /* We set the blksize from the cluster size for performance */
901 stat->blksize = osb->s_clustersize;
909 static int ocfs2_write_remove_suid(struct inode *inode)
912 struct buffer_head *bh = NULL;
913 struct ocfs2_inode_info *oi = OCFS2_I(inode);
914 struct ocfs2_journal_handle *handle;
915 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
916 struct ocfs2_dinode *di;
918 mlog_entry("(Inode %llu, mode 0%o)\n",
919 (unsigned long long)oi->ip_blkno, inode->i_mode);
921 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
922 if (handle == NULL) {
928 ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
934 ret = ocfs2_journal_access(handle, inode, bh,
935 OCFS2_JOURNAL_ACCESS_WRITE);
941 inode->i_mode &= ~S_ISUID;
942 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
943 inode->i_mode &= ~S_ISGID;
945 di = (struct ocfs2_dinode *) bh->b_data;
946 di->i_mode = cpu_to_le16(inode->i_mode);
948 ret = ocfs2_journal_dirty(handle, bh);
954 ocfs2_commit_trans(handle);
960 static inline int ocfs2_write_should_remove_suid(struct inode *inode)
962 mode_t mode = inode->i_mode;
964 if (!capable(CAP_FSETID)) {
965 if (unlikely(mode & S_ISUID))
968 if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
974 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
975 const struct iovec *iov,
976 unsigned long nr_segs,
979 int ret, rw_level = -1, meta_level = -1, have_alloc_sem = 0;
981 struct file *filp = iocb->ki_filp;
982 struct inode *inode = filp->f_dentry->d_inode;
983 loff_t newsize, saved_pos;
985 mlog_entry("(0x%p, %u, '%.*s')\n", filp,
986 (unsigned int)nr_segs,
987 filp->f_dentry->d_name.len,
988 filp->f_dentry->d_name.name);
990 /* happy write of zero bytes */
991 if (iocb->ki_left == 0)
995 mlog(0, "bad inode\n");
999 mutex_lock(&inode->i_mutex);
1000 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
1001 if (filp->f_flags & O_DIRECT) {
1003 down_read(&inode->i_alloc_sem);
1006 /* concurrent O_DIRECT writes are allowed */
1007 rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1;
1008 ret = ocfs2_rw_lock(inode, rw_level);
1016 * We sample i_size under a read level meta lock to see if our write
1017 * is extending the file, if it is we back off and get a write level
1020 meta_level = (filp->f_flags & O_APPEND) ? 1 : 0;
1022 ret = ocfs2_meta_lock(inode, NULL, NULL, meta_level);
1029 /* Clear suid / sgid if necessary. We do this here
1030 * instead of later in the write path because
1031 * remove_suid() calls ->setattr without any hint that
1032 * we may have already done our cluster locking. Since
1033 * ocfs2_setattr() *must* take cluster locks to
1034 * proceeed, this will lead us to recursively lock the
1035 * inode. There's also the dinode i_size state which
1036 * can be lost via setattr during extending writes (we
1037 * set inode->i_size at the end of a write. */
1038 if (ocfs2_write_should_remove_suid(inode)) {
1039 if (meta_level == 0) {
1040 ocfs2_meta_unlock(inode, meta_level);
1045 ret = ocfs2_write_remove_suid(inode);
1052 /* work on a copy of ppos until we're sure that we won't have
1053 * to recalculate it due to relocking. */
1054 if (filp->f_flags & O_APPEND) {
1055 saved_pos = i_size_read(inode);
1056 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
1058 saved_pos = iocb->ki_pos;
1060 newsize = iocb->ki_left + saved_pos;
1062 mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
1063 (long long) saved_pos, (long long) newsize,
1064 (long long) i_size_read(inode));
1066 /* No need for a higher level metadata lock if we're
1067 * never going past i_size. */
1068 if (newsize <= i_size_read(inode))
1071 if (meta_level == 0) {
1072 ocfs2_meta_unlock(inode, meta_level);
1077 spin_lock(&OCFS2_I(inode)->ip_lock);
1078 clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) -
1079 OCFS2_I(inode)->ip_clusters;
1080 spin_unlock(&OCFS2_I(inode)->ip_lock);
1082 mlog(0, "Writing at EOF, may need more allocation: "
1083 "i_size = %lld, newsize = %lld, need %u clusters\n",
1084 (long long) i_size_read(inode), (long long) newsize,
1087 /* We only want to continue the rest of this loop if
1088 * our extend will actually require more
1093 ret = ocfs2_extend_file(inode, NULL, newsize, iocb->ki_left);
1102 /* ok, we're done with i_size and alloc work */
1103 iocb->ki_pos = saved_pos;
1104 ocfs2_meta_unlock(inode, meta_level);
1107 /* communicate with ocfs2_dio_end_io */
1108 ocfs2_iocb_set_rw_locked(iocb);
1110 ret = generic_file_aio_write_nolock(iocb, iov, nr_segs, iocb->ki_pos);
1112 /* buffered aio wouldn't have proper lock coverage today */
1113 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
1116 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
1117 * function pointer which is called when o_direct io completes so that
1118 * it can unlock our rw lock. (it's the clustered equivalent of
1119 * i_alloc_sem; protects truncate from racing with pending ios).
1120 * Unfortunately there are error cases which call end_io and others
1121 * that don't. so we don't have to unlock the rw_lock if either an
1122 * async dio is going to do it in the future or an end_io after an
1123 * error has already done it.
1125 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1131 if (meta_level != -1)
1132 ocfs2_meta_unlock(inode, meta_level);
1134 up_read(&inode->i_alloc_sem);
1136 ocfs2_rw_unlock(inode, rw_level);
1137 mutex_unlock(&inode->i_mutex);
1143 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
1144 const struct iovec *iov,
1145 unsigned long nr_segs,
1148 int ret = 0, rw_level = -1, have_alloc_sem = 0;
1149 struct file *filp = iocb->ki_filp;
1150 struct inode *inode = filp->f_dentry->d_inode;
1152 mlog_entry("(0x%p, %u, '%.*s')\n", filp,
1153 (unsigned int)nr_segs,
1154 filp->f_dentry->d_name.len,
1155 filp->f_dentry->d_name.name);
1164 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
1165 * need locks to protect pending reads from racing with truncate.
1167 if (filp->f_flags & O_DIRECT) {
1168 down_read(&inode->i_alloc_sem);
1171 ret = ocfs2_rw_lock(inode, 0);
1177 /* communicate with ocfs2_dio_end_io */
1178 ocfs2_iocb_set_rw_locked(iocb);
1182 * We're fine letting folks race truncates and extending
1183 * writes with read across the cluster, just like they can
1184 * locally. Hence no rw_lock during read.
1186 * Take and drop the meta data lock to update inode fields
1187 * like i_size. This allows the checks down below
1188 * generic_file_aio_read() a chance of actually working.
1190 ret = ocfs2_meta_lock(inode, NULL, NULL, 0);
1195 ocfs2_meta_unlock(inode, 0);
1197 ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
1199 mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n");
1201 /* buffered aio wouldn't have proper lock coverage today */
1202 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
1204 /* see ocfs2_file_aio_write */
1205 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1212 up_read(&inode->i_alloc_sem);
1214 ocfs2_rw_unlock(inode, rw_level);
1220 struct inode_operations ocfs2_file_iops = {
1221 .setattr = ocfs2_setattr,
1222 .getattr = ocfs2_getattr,
1225 struct inode_operations ocfs2_special_file_iops = {
1226 .setattr = ocfs2_setattr,
1227 .getattr = ocfs2_getattr,
1230 const struct file_operations ocfs2_fops = {
1231 .read = do_sync_read,
1232 .write = do_sync_write,
1233 .sendfile = generic_file_sendfile,
1235 .fsync = ocfs2_sync_file,
1236 .release = ocfs2_file_release,
1237 .open = ocfs2_file_open,
1238 .aio_read = ocfs2_file_aio_read,
1239 .aio_write = ocfs2_file_aio_write,
1240 .ioctl = ocfs2_ioctl,
1243 const struct file_operations ocfs2_dops = {
1244 .read = generic_read_dir,
1245 .readdir = ocfs2_readdir,
1246 .fsync = ocfs2_sync_file,
1247 .ioctl = ocfs2_ioctl,