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>
34 #define MLOG_MASK_PREFIX ML_INODE
35 #include <cluster/masklog.h>
43 #include "extent_map.h"
52 #include "buffer_head_io.h"
54 static int ocfs2_sync_inode(struct inode *inode)
56 filemap_fdatawrite(inode->i_mapping);
57 return sync_mapping_buffers(inode->i_mapping);
60 static int ocfs2_file_open(struct inode *inode, struct file *file)
63 int mode = file->f_flags;
64 struct ocfs2_inode_info *oi = OCFS2_I(inode);
66 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
67 file->f_dentry->d_name.len, file->f_dentry->d_name.name);
69 spin_lock(&oi->ip_lock);
71 /* Check that the inode hasn't been wiped from disk by another
72 * node. If it hasn't then we're safe as long as we hold the
73 * spin lock until our increment of open count. */
74 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
75 spin_unlock(&oi->ip_lock);
82 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
85 spin_unlock(&oi->ip_lock);
92 static int ocfs2_file_release(struct inode *inode, struct file *file)
94 struct ocfs2_inode_info *oi = OCFS2_I(inode);
96 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
97 file->f_dentry->d_name.len,
98 file->f_dentry->d_name.name);
100 spin_lock(&oi->ip_lock);
101 if (!--oi->ip_open_count)
102 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
103 spin_unlock(&oi->ip_lock);
110 static int ocfs2_sync_file(struct file *file,
111 struct dentry *dentry,
116 struct inode *inode = dentry->d_inode;
117 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
119 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync,
120 dentry->d_name.len, dentry->d_name.name);
122 err = ocfs2_sync_inode(dentry->d_inode);
126 journal = osb->journal->j_journal;
127 err = journal_force_commit(journal);
132 return (err < 0) ? -EIO : 0;
135 int ocfs2_set_inode_size(struct ocfs2_journal_handle *handle,
137 struct buffer_head *fe_bh,
143 i_size_write(inode, new_i_size);
144 inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size);
145 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
147 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
158 static int ocfs2_simple_size_update(struct inode *inode,
159 struct buffer_head *di_bh,
163 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
164 struct ocfs2_journal_handle *handle = NULL;
166 handle = ocfs2_start_trans(osb, NULL,
167 OCFS2_INODE_UPDATE_CREDITS);
168 if (handle == NULL) {
174 ret = ocfs2_set_inode_size(handle, inode, di_bh,
179 ocfs2_commit_trans(handle);
184 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
186 struct buffer_head *fe_bh,
190 struct ocfs2_journal_handle *handle;
194 /* TODO: This needs to actually orphan the inode in this
197 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
198 if (IS_ERR(handle)) {
199 status = PTR_ERR(handle);
204 status = ocfs2_set_inode_size(handle, inode, fe_bh, new_i_size);
208 ocfs2_commit_trans(handle);
214 static int ocfs2_truncate_file(struct inode *inode,
215 struct buffer_head *di_bh,
219 struct ocfs2_dinode *fe = NULL;
220 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
221 struct ocfs2_truncate_context *tc = NULL;
223 mlog_entry("(inode = %"MLFu64", new_i_size = %"MLFu64"\n",
224 OCFS2_I(inode)->ip_blkno, new_i_size);
226 truncate_inode_pages(inode->i_mapping, new_i_size);
228 fe = (struct ocfs2_dinode *) di_bh->b_data;
229 if (!OCFS2_IS_VALID_DINODE(fe)) {
230 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
235 mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
236 "Inode %"MLFu64", inode i_size = %lld != di "
237 "i_size = %"MLFu64", i_flags = 0x%x\n",
238 OCFS2_I(inode)->ip_blkno,
240 le64_to_cpu(fe->i_size), le32_to_cpu(fe->i_flags));
242 if (new_i_size > le64_to_cpu(fe->i_size)) {
243 mlog(0, "asked to truncate file with size (%"MLFu64") "
244 "to size (%"MLFu64")!\n",
245 le64_to_cpu(fe->i_size), new_i_size);
251 mlog(0, "inode %"MLFu64", i_size = %"MLFu64", new_i_size = %"MLFu64"\n",
252 le64_to_cpu(fe->i_blkno), le64_to_cpu(fe->i_size), new_i_size);
254 /* lets handle the simple truncate cases before doing any more
255 * cluster locking. */
256 if (new_i_size == le64_to_cpu(fe->i_size))
259 if (le32_to_cpu(fe->i_clusters) ==
260 ocfs2_clusters_for_bytes(osb->sb, new_i_size)) {
261 mlog(0, "fe->i_clusters = %u, so we do a simple truncate\n",
263 /* No allocation change is required, so lets fast path
265 status = ocfs2_simple_size_update(inode, di_bh, new_i_size);
271 /* This forces other nodes to sync and drop their pages */
272 status = ocfs2_data_lock(inode, 1);
277 ocfs2_data_unlock(inode, 1);
279 /* alright, we're going to need to do a full blown alloc size
280 * change. Orphan the inode so that recovery can complete the
281 * truncate if necessary. This does the task of marking
283 status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
289 status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
295 status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
301 /* TODO: orphan dir cleanup here. */
309 * extend allocation only here.
310 * we'll update all the disk stuff, and oip->alloc_size
312 * expect stuff to be locked, a transaction started and enough data /
313 * metadata reservations in the contexts.
315 * Will return -EAGAIN, and a reason if a restart is needed.
316 * If passed in, *reason will always be set, even in error.
318 int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
321 struct buffer_head *fe_bh,
322 struct ocfs2_journal_handle *handle,
323 struct ocfs2_alloc_context *data_ac,
324 struct ocfs2_alloc_context *meta_ac,
325 enum ocfs2_alloc_restarted *reason_ret)
329 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
330 enum ocfs2_alloc_restarted reason = RESTART_NONE;
331 u32 bit_off, num_bits;
334 BUG_ON(!clusters_to_add);
336 free_extents = ocfs2_num_free_extents(osb, inode, fe);
337 if (free_extents < 0) {
338 status = free_extents;
343 /* there are two cases which could cause us to EAGAIN in the
344 * we-need-more-metadata case:
345 * 1) we haven't reserved *any*
346 * 2) we are so fragmented, we've needed to add metadata too
348 if (!free_extents && !meta_ac) {
349 mlog(0, "we haven't reserved any metadata!\n");
351 reason = RESTART_META;
353 } else if ((!free_extents)
354 && (ocfs2_alloc_context_bits_left(meta_ac)
355 < ocfs2_extend_meta_needed(fe))) {
356 mlog(0, "filesystem is really fragmented...\n");
358 reason = RESTART_META;
362 status = ocfs2_claim_clusters(osb, handle, data_ac, 1,
363 &bit_off, &num_bits);
365 if (status != -ENOSPC)
370 BUG_ON(num_bits > clusters_to_add);
372 /* reserve our write early -- insert_extent may update the inode */
373 status = ocfs2_journal_access(handle, inode, fe_bh,
374 OCFS2_JOURNAL_ACCESS_WRITE);
380 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
381 mlog(0, "Allocating %u clusters at block %u for inode %"MLFu64"\n",
382 num_bits, bit_off, OCFS2_I(inode)->ip_blkno);
383 status = ocfs2_insert_extent(osb, handle, inode, fe_bh, block,
390 le32_add_cpu(&fe->i_clusters, num_bits);
391 spin_lock(&OCFS2_I(inode)->ip_lock);
392 OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
393 spin_unlock(&OCFS2_I(inode)->ip_lock);
395 status = ocfs2_journal_dirty(handle, fe_bh);
401 clusters_to_add -= num_bits;
403 if (clusters_to_add) {
404 mlog(0, "need to alloc once more, clusters = %u, wanted = "
405 "%u\n", fe->i_clusters, clusters_to_add);
407 reason = RESTART_TRANS;
413 *reason_ret = reason;
417 static int ocfs2_extend_allocation(struct inode *inode,
421 int restart_func = 0;
422 int drop_alloc_sem = 0;
423 int credits, num_free_extents;
425 struct buffer_head *bh = NULL;
426 struct ocfs2_dinode *fe = NULL;
427 struct ocfs2_journal_handle *handle = NULL;
428 struct ocfs2_alloc_context *data_ac = NULL;
429 struct ocfs2_alloc_context *meta_ac = NULL;
430 enum ocfs2_alloc_restarted why;
431 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
433 mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
435 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
436 OCFS2_BH_CACHED, inode);
442 fe = (struct ocfs2_dinode *) bh->b_data;
443 if (!OCFS2_IS_VALID_DINODE(fe)) {
444 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
450 BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
452 mlog(0, "extend inode %"MLFu64", i_size = %lld, fe->i_clusters = %u, "
453 "clusters_to_add = %u\n",
454 OCFS2_I(inode)->ip_blkno, i_size_read(inode),
455 fe->i_clusters, clusters_to_add);
457 handle = ocfs2_alloc_handle(osb);
458 if (handle == NULL) {
464 num_free_extents = ocfs2_num_free_extents(osb,
467 if (num_free_extents < 0) {
468 status = num_free_extents;
473 if (!num_free_extents) {
474 status = ocfs2_reserve_new_metadata(osb,
479 if (status != -ENOSPC)
485 status = ocfs2_reserve_clusters(osb,
490 if (status != -ENOSPC)
495 /* blocks peope in read/write from reading our allocation
496 * until we're done changing it. We depend on i_mutex to block
497 * other extend/truncate calls while we're here. Ordering wrt
498 * start_trans is important here -- always do it before! */
499 down_write(&OCFS2_I(inode)->ip_alloc_sem);
502 credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
503 handle = ocfs2_start_trans(osb, handle, credits);
504 if (IS_ERR(handle)) {
505 status = PTR_ERR(handle);
511 restarted_transaction:
512 /* reserve a write to the file entry early on - that we if we
513 * run out of credits in the allocation path, we can still
515 status = ocfs2_journal_access(handle, inode, bh,
516 OCFS2_JOURNAL_ACCESS_WRITE);
522 prev_clusters = OCFS2_I(inode)->ip_clusters;
524 status = ocfs2_do_extend_allocation(osb,
532 if ((status < 0) && (status != -EAGAIN)) {
533 if (status != -ENOSPC)
538 status = ocfs2_journal_dirty(handle, bh);
544 spin_lock(&OCFS2_I(inode)->ip_lock);
545 clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
546 spin_unlock(&OCFS2_I(inode)->ip_lock);
548 if (why != RESTART_NONE && clusters_to_add) {
549 if (why == RESTART_META) {
550 mlog(0, "restarting function.\n");
553 BUG_ON(why != RESTART_TRANS);
555 mlog(0, "restarting transaction.\n");
556 /* TODO: This can be more intelligent. */
557 credits = ocfs2_calc_extend_credits(osb->sb,
560 status = ocfs2_extend_trans(handle, credits);
562 /* handle still has to be committed at
568 goto restarted_transaction;
572 mlog(0, "fe: i_clusters = %u, i_size=%"MLFu64"\n",
573 fe->i_clusters, fe->i_size);
574 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
575 OCFS2_I(inode)->ip_clusters, i_size_read(inode));
578 if (drop_alloc_sem) {
579 up_write(&OCFS2_I(inode)->ip_alloc_sem);
583 ocfs2_commit_trans(handle);
587 ocfs2_free_alloc_context(data_ac);
591 ocfs2_free_alloc_context(meta_ac);
594 if ((!status) && restart_func) {
607 /* Some parts of this taken from generic_cont_expand, which turned out
608 * to be too fragile to do exactly what we need without us having to
609 * worry about recursive locking in ->commit_write(). */
610 static int ocfs2_write_zero_page(struct inode *inode,
613 struct address_space *mapping = inode->i_mapping;
617 struct ocfs2_journal_handle *handle = NULL;
620 offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
621 /* ugh. in prepare/commit_write, if from==to==start of block, we
622 ** skip the prepare. make sure we never send an offset for the start
625 if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
628 index = size >> PAGE_CACHE_SHIFT;
630 page = grab_cache_page(mapping, index);
637 ret = ocfs2_prepare_write(NULL, page, offset, offset);
643 if (ocfs2_should_order_data(inode)) {
644 handle = ocfs2_start_walk_page_trans(inode, page, offset,
646 if (IS_ERR(handle)) {
647 ret = PTR_ERR(handle);
653 /* must not update i_size! */
654 ret = block_commit_write(page, offset, offset);
661 ocfs2_commit_trans(handle);
664 page_cache_release(page);
669 static int ocfs2_zero_extend(struct inode *inode,
674 struct super_block *sb = inode->i_sb;
676 start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
677 while (start_off < zero_to_size) {
678 ret = ocfs2_write_zero_page(inode, start_off);
684 start_off += sb->s_blocksize;
691 static int ocfs2_extend_file(struct inode *inode,
692 struct buffer_head *di_bh,
698 /* setattr sometimes calls us like this. */
702 if (i_size_read(inode) == new_i_size)
704 BUG_ON(new_i_size < i_size_read(inode));
706 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) -
707 OCFS2_I(inode)->ip_clusters;
709 if (clusters_to_add) {
710 ret = ocfs2_extend_allocation(inode, clusters_to_add);
716 ret = ocfs2_zero_extend(inode, new_i_size);
723 /* No allocation required, we just use this helper to
724 * do a trivial update of i_size. */
725 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
735 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
737 int status = 0, size_change;
738 struct inode *inode = dentry->d_inode;
739 struct super_block *sb = inode->i_sb;
740 struct ocfs2_super *osb = OCFS2_SB(sb);
741 struct buffer_head *bh = NULL;
742 struct ocfs2_journal_handle *handle = NULL;
744 mlog_entry("(0x%p, '%.*s')\n", dentry,
745 dentry->d_name.len, dentry->d_name.name);
747 if (attr->ia_valid & ATTR_MODE)
748 mlog(0, "mode change: %d\n", attr->ia_mode);
749 if (attr->ia_valid & ATTR_UID)
750 mlog(0, "uid change: %d\n", attr->ia_uid);
751 if (attr->ia_valid & ATTR_GID)
752 mlog(0, "gid change: %d\n", attr->ia_gid);
753 if (attr->ia_valid & ATTR_SIZE)
754 mlog(0, "size change...\n");
755 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
756 mlog(0, "time change...\n");
758 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
759 | ATTR_GID | ATTR_UID | ATTR_MODE)
760 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
761 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
765 status = inode_change_ok(inode, attr);
769 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
771 status = ocfs2_rw_lock(inode, 1);
778 status = ocfs2_meta_lock(inode, NULL, &bh, 1);
780 if (status != -ENOENT)
785 if (size_change && attr->ia_size != i_size_read(inode)) {
786 if (i_size_read(inode) > attr->ia_size)
787 status = ocfs2_truncate_file(inode, bh, attr->ia_size);
789 status = ocfs2_extend_file(inode, bh, attr->ia_size);
791 if (status != -ENOSPC)
798 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
799 if (IS_ERR(handle)) {
800 status = PTR_ERR(handle);
805 status = inode_setattr(inode, attr);
811 status = ocfs2_mark_inode_dirty(handle, inode, bh);
816 ocfs2_commit_trans(handle);
818 ocfs2_meta_unlock(inode, 1);
821 ocfs2_rw_unlock(inode, 1);
830 int ocfs2_getattr(struct vfsmount *mnt,
831 struct dentry *dentry,
834 struct inode *inode = dentry->d_inode;
835 struct super_block *sb = dentry->d_inode->i_sb;
836 struct ocfs2_super *osb = sb->s_fs_info;
841 err = ocfs2_inode_revalidate(dentry);
848 generic_fillattr(inode, stat);
850 /* We set the blksize from the cluster size for performance */
851 stat->blksize = osb->s_clustersize;
859 static int ocfs2_write_remove_suid(struct inode *inode)
862 struct buffer_head *bh = NULL;
863 struct ocfs2_inode_info *oi = OCFS2_I(inode);
864 struct ocfs2_journal_handle *handle;
865 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
866 struct ocfs2_dinode *di;
868 mlog_entry("(Inode %"MLFu64", mode 0%o)\n", oi->ip_blkno,
871 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
872 if (handle == NULL) {
878 ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
884 ret = ocfs2_journal_access(handle, inode, bh,
885 OCFS2_JOURNAL_ACCESS_WRITE);
891 inode->i_mode &= ~S_ISUID;
892 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
893 inode->i_mode &= ~S_ISGID;
895 di = (struct ocfs2_dinode *) bh->b_data;
896 di->i_mode = cpu_to_le16(inode->i_mode);
898 ret = ocfs2_journal_dirty(handle, bh);
904 ocfs2_commit_trans(handle);
910 static inline int ocfs2_write_should_remove_suid(struct inode *inode)
912 mode_t mode = inode->i_mode;
914 if (!capable(CAP_FSETID)) {
915 if (unlikely(mode & S_ISUID))
918 if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
924 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
925 const char __user *buf,
929 struct iovec local_iov = { .iov_base = (void __user *)buf,
931 int ret, rw_level = -1, meta_level = -1, have_alloc_sem = 0;
933 struct file *filp = iocb->ki_filp;
934 struct inode *inode = filp->f_dentry->d_inode;
935 loff_t newsize, saved_pos;
936 #ifdef OCFS2_ORACORE_WORKAROUNDS
937 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
940 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
942 filp->f_dentry->d_name.len,
943 filp->f_dentry->d_name.name);
945 /* happy write of zero bytes */
950 mlog(0, "bad inode\n");
954 #ifdef OCFS2_ORACORE_WORKAROUNDS
955 /* ugh, work around some applications which open everything O_DIRECT +
956 * O_APPEND and really don't mean to use O_DIRECT. */
957 if (osb->s_mount_opt & OCFS2_MOUNT_COMPAT_OCFS &&
958 (filp->f_flags & O_APPEND) && (filp->f_flags & O_DIRECT))
959 filp->f_flags &= ~O_DIRECT;
962 mutex_lock(&inode->i_mutex);
963 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
964 if (filp->f_flags & O_DIRECT) {
966 down_read(&inode->i_alloc_sem);
969 /* concurrent O_DIRECT writes are allowed */
970 rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1;
971 ret = ocfs2_rw_lock(inode, rw_level);
979 * We sample i_size under a read level meta lock to see if our write
980 * is extending the file, if it is we back off and get a write level
983 meta_level = (filp->f_flags & O_APPEND) ? 1 : 0;
985 ret = ocfs2_meta_lock(inode, NULL, NULL, meta_level);
992 /* Clear suid / sgid if necessary. We do this here
993 * instead of later in the write path because
994 * remove_suid() calls ->setattr without any hint that
995 * we may have already done our cluster locking. Since
996 * ocfs2_setattr() *must* take cluster locks to
997 * proceeed, this will lead us to recursively lock the
998 * inode. There's also the dinode i_size state which
999 * can be lost via setattr during extending writes (we
1000 * set inode->i_size at the end of a write. */
1001 if (ocfs2_write_should_remove_suid(inode)) {
1002 if (meta_level == 0) {
1003 ocfs2_meta_unlock(inode, meta_level);
1008 ret = ocfs2_write_remove_suid(inode);
1015 /* work on a copy of ppos until we're sure that we won't have
1016 * to recalculate it due to relocking. */
1017 if (filp->f_flags & O_APPEND) {
1018 saved_pos = i_size_read(inode);
1019 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
1021 saved_pos = iocb->ki_pos;
1023 newsize = count + saved_pos;
1025 mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
1026 (long long) saved_pos, (long long) newsize,
1027 (long long) i_size_read(inode));
1029 /* No need for a higher level metadata lock if we're
1030 * never going past i_size. */
1031 if (newsize <= i_size_read(inode))
1034 if (meta_level == 0) {
1035 ocfs2_meta_unlock(inode, meta_level);
1040 spin_lock(&OCFS2_I(inode)->ip_lock);
1041 clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) -
1042 OCFS2_I(inode)->ip_clusters;
1043 spin_unlock(&OCFS2_I(inode)->ip_lock);
1045 mlog(0, "Writing at EOF, may need more allocation: "
1046 "i_size = %lld, newsize = %lld, need %u clusters\n",
1047 (long long) i_size_read(inode), (long long) newsize,
1050 /* We only want to continue the rest of this loop if
1051 * our extend will actually require more
1056 ret = ocfs2_extend_allocation(inode, clusters);
1063 /* Fill any holes which would've been created by this
1064 * write. If we're O_APPEND, this will wind up
1065 * (correctly) being a noop. */
1066 ret = ocfs2_zero_extend(inode, (u64) newsize - count);
1074 /* ok, we're done with i_size and alloc work */
1075 iocb->ki_pos = saved_pos;
1076 ocfs2_meta_unlock(inode, meta_level);
1079 /* communicate with ocfs2_dio_end_io */
1080 ocfs2_iocb_set_rw_locked(iocb);
1082 #ifdef OCFS2_ORACORE_WORKAROUNDS
1083 if (osb->s_mount_opt & OCFS2_MOUNT_COMPAT_OCFS &&
1084 filp->f_flags & O_DIRECT) {
1085 unsigned int saved_flags = filp->f_flags;
1086 int sector_size = 1 << osb->s_sectsize_bits;
1088 if ((saved_pos & (sector_size - 1)) ||
1089 (count & (sector_size - 1)) ||
1090 ((unsigned long)buf & (sector_size - 1))) {
1091 filp->f_flags |= O_SYNC;
1092 filp->f_flags &= ~O_DIRECT;
1095 ret = generic_file_aio_write_nolock(iocb, &local_iov, 1,
1098 filp->f_flags = saved_flags;
1101 ret = generic_file_aio_write_nolock(iocb, &local_iov, 1,
1104 /* buffered aio wouldn't have proper lock coverage today */
1105 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
1108 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
1109 * function pointer which is called when o_direct io completes so that
1110 * it can unlock our rw lock. (it's the clustered equivalent of
1111 * i_alloc_sem; protects truncate from racing with pending ios).
1112 * Unfortunately there are error cases which call end_io and others
1113 * that don't. so we don't have to unlock the rw_lock if either an
1114 * async dio is going to do it in the future or an end_io after an
1115 * error has already done it.
1117 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1123 if (meta_level != -1)
1124 ocfs2_meta_unlock(inode, meta_level);
1126 up_read(&inode->i_alloc_sem);
1128 ocfs2_rw_unlock(inode, rw_level);
1129 mutex_unlock(&inode->i_mutex);
1135 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
1140 int ret = 0, rw_level = -1, have_alloc_sem = 0;
1141 struct file *filp = iocb->ki_filp;
1142 struct inode *inode = filp->f_dentry->d_inode;
1143 #ifdef OCFS2_ORACORE_WORKAROUNDS
1144 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1147 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
1148 (unsigned int)count,
1149 filp->f_dentry->d_name.len,
1150 filp->f_dentry->d_name.name);
1158 #ifdef OCFS2_ORACORE_WORKAROUNDS
1159 if (osb->s_mount_opt & OCFS2_MOUNT_COMPAT_OCFS) {
1160 if (filp->f_flags & O_DIRECT) {
1161 int sector_size = 1 << osb->s_sectsize_bits;
1163 if ((pos & (sector_size - 1)) ||
1164 (count & (sector_size - 1)) ||
1165 ((unsigned long)buf & (sector_size - 1)) ||
1166 (i_size_read(inode) & (sector_size -1))) {
1167 filp->f_flags &= ~O_DIRECT;
1174 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
1175 * need locks to protect pending reads from racing with truncate.
1177 if (filp->f_flags & O_DIRECT) {
1178 down_read(&inode->i_alloc_sem);
1181 ret = ocfs2_rw_lock(inode, 0);
1187 /* communicate with ocfs2_dio_end_io */
1188 ocfs2_iocb_set_rw_locked(iocb);
1191 ret = generic_file_aio_read(iocb, buf, count, iocb->ki_pos);
1193 mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n");
1195 /* buffered aio wouldn't have proper lock coverage today */
1196 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
1198 /* see ocfs2_file_aio_write */
1199 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1206 up_read(&inode->i_alloc_sem);
1208 ocfs2_rw_unlock(inode, rw_level);
1214 struct inode_operations ocfs2_file_iops = {
1215 .setattr = ocfs2_setattr,
1216 .getattr = ocfs2_getattr,
1219 struct inode_operations ocfs2_special_file_iops = {
1220 .setattr = ocfs2_setattr,
1221 .getattr = ocfs2_getattr,
1224 struct file_operations ocfs2_fops = {
1225 .read = do_sync_read,
1226 .write = do_sync_write,
1227 .sendfile = generic_file_sendfile,
1229 .fsync = ocfs2_sync_file,
1230 .release = ocfs2_file_release,
1231 .open = ocfs2_file_open,
1232 .aio_read = ocfs2_file_aio_read,
1233 .aio_write = ocfs2_file_aio_write,
1236 struct file_operations ocfs2_dops = {
1237 .read = generic_read_dir,
1238 .readdir = ocfs2_readdir,
1239 .fsync = ocfs2_sync_file,