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 = %llu, new_i_size = %llu\n",
224 (unsigned long long)OCFS2_I(inode)->ip_blkno,
225 (unsigned long long)new_i_size);
227 truncate_inode_pages(inode->i_mapping, new_i_size);
229 fe = (struct ocfs2_dinode *) di_bh->b_data;
230 if (!OCFS2_IS_VALID_DINODE(fe)) {
231 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
236 mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
237 "Inode %llu, inode i_size = %lld != di "
238 "i_size = %llu, i_flags = 0x%x\n",
239 (unsigned long long)OCFS2_I(inode)->ip_blkno,
241 (unsigned long long)le64_to_cpu(fe->i_size),
242 le32_to_cpu(fe->i_flags));
244 if (new_i_size > le64_to_cpu(fe->i_size)) {
245 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
246 (unsigned long long)le64_to_cpu(fe->i_size),
247 (unsigned long long)new_i_size);
253 mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
254 (unsigned long long)le64_to_cpu(fe->i_blkno),
255 (unsigned long long)le64_to_cpu(fe->i_size),
256 (unsigned long long)new_i_size);
258 /* lets handle the simple truncate cases before doing any more
259 * cluster locking. */
260 if (new_i_size == le64_to_cpu(fe->i_size))
263 /* This forces other nodes to sync and drop their pages. Do
264 * this even if we have a truncate without allocation change -
265 * ocfs2 cluster sizes can be much greater than page size, so
266 * we have to truncate them anyway. */
267 status = ocfs2_data_lock(inode, 1);
272 ocfs2_data_unlock(inode, 1);
274 if (le32_to_cpu(fe->i_clusters) ==
275 ocfs2_clusters_for_bytes(osb->sb, new_i_size)) {
276 mlog(0, "fe->i_clusters = %u, so we do a simple truncate\n",
278 /* No allocation change is required, so lets fast path
280 status = ocfs2_simple_size_update(inode, di_bh, new_i_size);
286 /* alright, we're going to need to do a full blown alloc size
287 * change. Orphan the inode so that recovery can complete the
288 * truncate if necessary. This does the task of marking
290 status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
296 status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
302 status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
308 /* TODO: orphan dir cleanup here. */
316 * extend allocation only here.
317 * we'll update all the disk stuff, and oip->alloc_size
319 * expect stuff to be locked, a transaction started and enough data /
320 * metadata reservations in the contexts.
322 * Will return -EAGAIN, and a reason if a restart is needed.
323 * If passed in, *reason will always be set, even in error.
325 int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
328 struct buffer_head *fe_bh,
329 struct ocfs2_journal_handle *handle,
330 struct ocfs2_alloc_context *data_ac,
331 struct ocfs2_alloc_context *meta_ac,
332 enum ocfs2_alloc_restarted *reason_ret)
336 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
337 enum ocfs2_alloc_restarted reason = RESTART_NONE;
338 u32 bit_off, num_bits;
341 BUG_ON(!clusters_to_add);
343 free_extents = ocfs2_num_free_extents(osb, inode, fe);
344 if (free_extents < 0) {
345 status = free_extents;
350 /* there are two cases which could cause us to EAGAIN in the
351 * we-need-more-metadata case:
352 * 1) we haven't reserved *any*
353 * 2) we are so fragmented, we've needed to add metadata too
355 if (!free_extents && !meta_ac) {
356 mlog(0, "we haven't reserved any metadata!\n");
358 reason = RESTART_META;
360 } else if ((!free_extents)
361 && (ocfs2_alloc_context_bits_left(meta_ac)
362 < ocfs2_extend_meta_needed(fe))) {
363 mlog(0, "filesystem is really fragmented...\n");
365 reason = RESTART_META;
369 status = ocfs2_claim_clusters(osb, handle, data_ac, 1,
370 &bit_off, &num_bits);
372 if (status != -ENOSPC)
377 BUG_ON(num_bits > clusters_to_add);
379 /* reserve our write early -- insert_extent may update the inode */
380 status = ocfs2_journal_access(handle, inode, fe_bh,
381 OCFS2_JOURNAL_ACCESS_WRITE);
387 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
388 mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
389 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
390 status = ocfs2_insert_extent(osb, handle, inode, fe_bh, block,
397 le32_add_cpu(&fe->i_clusters, num_bits);
398 spin_lock(&OCFS2_I(inode)->ip_lock);
399 OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
400 spin_unlock(&OCFS2_I(inode)->ip_lock);
402 status = ocfs2_journal_dirty(handle, fe_bh);
408 clusters_to_add -= num_bits;
410 if (clusters_to_add) {
411 mlog(0, "need to alloc once more, clusters = %u, wanted = "
412 "%u\n", fe->i_clusters, clusters_to_add);
414 reason = RESTART_TRANS;
420 *reason_ret = reason;
424 static int ocfs2_extend_allocation(struct inode *inode,
428 int restart_func = 0;
429 int drop_alloc_sem = 0;
430 int credits, num_free_extents;
432 struct buffer_head *bh = NULL;
433 struct ocfs2_dinode *fe = NULL;
434 struct ocfs2_journal_handle *handle = NULL;
435 struct ocfs2_alloc_context *data_ac = NULL;
436 struct ocfs2_alloc_context *meta_ac = NULL;
437 enum ocfs2_alloc_restarted why;
438 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
440 mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
442 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
443 OCFS2_BH_CACHED, inode);
449 fe = (struct ocfs2_dinode *) bh->b_data;
450 if (!OCFS2_IS_VALID_DINODE(fe)) {
451 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
457 BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
459 mlog(0, "extend inode %llu, i_size = %lld, fe->i_clusters = %u, "
460 "clusters_to_add = %u\n",
461 (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode),
462 fe->i_clusters, clusters_to_add);
464 handle = ocfs2_alloc_handle(osb);
465 if (handle == NULL) {
471 num_free_extents = ocfs2_num_free_extents(osb,
474 if (num_free_extents < 0) {
475 status = num_free_extents;
480 if (!num_free_extents) {
481 status = ocfs2_reserve_new_metadata(osb,
486 if (status != -ENOSPC)
492 status = ocfs2_reserve_clusters(osb,
497 if (status != -ENOSPC)
502 /* blocks peope in read/write from reading our allocation
503 * until we're done changing it. We depend on i_mutex to block
504 * other extend/truncate calls while we're here. Ordering wrt
505 * start_trans is important here -- always do it before! */
506 down_write(&OCFS2_I(inode)->ip_alloc_sem);
509 credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
510 handle = ocfs2_start_trans(osb, handle, credits);
511 if (IS_ERR(handle)) {
512 status = PTR_ERR(handle);
518 restarted_transaction:
519 /* reserve a write to the file entry early on - that we if we
520 * run out of credits in the allocation path, we can still
522 status = ocfs2_journal_access(handle, inode, bh,
523 OCFS2_JOURNAL_ACCESS_WRITE);
529 prev_clusters = OCFS2_I(inode)->ip_clusters;
531 status = ocfs2_do_extend_allocation(osb,
539 if ((status < 0) && (status != -EAGAIN)) {
540 if (status != -ENOSPC)
545 status = ocfs2_journal_dirty(handle, bh);
551 spin_lock(&OCFS2_I(inode)->ip_lock);
552 clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
553 spin_unlock(&OCFS2_I(inode)->ip_lock);
555 if (why != RESTART_NONE && clusters_to_add) {
556 if (why == RESTART_META) {
557 mlog(0, "restarting function.\n");
560 BUG_ON(why != RESTART_TRANS);
562 mlog(0, "restarting transaction.\n");
563 /* TODO: This can be more intelligent. */
564 credits = ocfs2_calc_extend_credits(osb->sb,
567 status = ocfs2_extend_trans(handle, credits);
569 /* handle still has to be committed at
575 goto restarted_transaction;
579 mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
580 fe->i_clusters, (unsigned long long)fe->i_size);
581 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
582 OCFS2_I(inode)->ip_clusters, i_size_read(inode));
585 if (drop_alloc_sem) {
586 up_write(&OCFS2_I(inode)->ip_alloc_sem);
590 ocfs2_commit_trans(handle);
594 ocfs2_free_alloc_context(data_ac);
598 ocfs2_free_alloc_context(meta_ac);
601 if ((!status) && restart_func) {
614 /* Some parts of this taken from generic_cont_expand, which turned out
615 * to be too fragile to do exactly what we need without us having to
616 * worry about recursive locking in ->commit_write(). */
617 static int ocfs2_write_zero_page(struct inode *inode,
620 struct address_space *mapping = inode->i_mapping;
624 struct ocfs2_journal_handle *handle = NULL;
627 offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
628 /* ugh. in prepare/commit_write, if from==to==start of block, we
629 ** skip the prepare. make sure we never send an offset for the start
632 if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
635 index = size >> PAGE_CACHE_SHIFT;
637 page = grab_cache_page(mapping, index);
644 ret = ocfs2_prepare_write(NULL, page, offset, offset);
650 if (ocfs2_should_order_data(inode)) {
651 handle = ocfs2_start_walk_page_trans(inode, page, offset,
653 if (IS_ERR(handle)) {
654 ret = PTR_ERR(handle);
660 /* must not update i_size! */
661 ret = block_commit_write(page, offset, offset);
668 ocfs2_commit_trans(handle);
671 page_cache_release(page);
676 static int ocfs2_zero_extend(struct inode *inode,
681 struct super_block *sb = inode->i_sb;
683 start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
684 while (start_off < zero_to_size) {
685 ret = ocfs2_write_zero_page(inode, start_off);
691 start_off += sb->s_blocksize;
698 static int ocfs2_extend_file(struct inode *inode,
699 struct buffer_head *di_bh,
705 /* setattr sometimes calls us like this. */
709 if (i_size_read(inode) == new_i_size)
711 BUG_ON(new_i_size < i_size_read(inode));
713 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) -
714 OCFS2_I(inode)->ip_clusters;
716 if (clusters_to_add) {
717 ret = ocfs2_extend_allocation(inode, clusters_to_add);
723 ret = ocfs2_zero_extend(inode, new_i_size);
730 /* No allocation required, we just use this helper to
731 * do a trivial update of i_size. */
732 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
742 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
744 int status = 0, size_change;
745 struct inode *inode = dentry->d_inode;
746 struct super_block *sb = inode->i_sb;
747 struct ocfs2_super *osb = OCFS2_SB(sb);
748 struct buffer_head *bh = NULL;
749 struct ocfs2_journal_handle *handle = NULL;
751 mlog_entry("(0x%p, '%.*s')\n", dentry,
752 dentry->d_name.len, dentry->d_name.name);
754 if (attr->ia_valid & ATTR_MODE)
755 mlog(0, "mode change: %d\n", attr->ia_mode);
756 if (attr->ia_valid & ATTR_UID)
757 mlog(0, "uid change: %d\n", attr->ia_uid);
758 if (attr->ia_valid & ATTR_GID)
759 mlog(0, "gid change: %d\n", attr->ia_gid);
760 if (attr->ia_valid & ATTR_SIZE)
761 mlog(0, "size change...\n");
762 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
763 mlog(0, "time change...\n");
765 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
766 | ATTR_GID | ATTR_UID | ATTR_MODE)
767 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
768 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
772 status = inode_change_ok(inode, attr);
776 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
778 status = ocfs2_rw_lock(inode, 1);
785 status = ocfs2_meta_lock(inode, NULL, &bh, 1);
787 if (status != -ENOENT)
792 if (size_change && attr->ia_size != i_size_read(inode)) {
793 if (i_size_read(inode) > attr->ia_size)
794 status = ocfs2_truncate_file(inode, bh, attr->ia_size);
796 status = ocfs2_extend_file(inode, bh, attr->ia_size);
798 if (status != -ENOSPC)
805 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
806 if (IS_ERR(handle)) {
807 status = PTR_ERR(handle);
812 status = inode_setattr(inode, attr);
818 status = ocfs2_mark_inode_dirty(handle, inode, bh);
823 ocfs2_commit_trans(handle);
825 ocfs2_meta_unlock(inode, 1);
828 ocfs2_rw_unlock(inode, 1);
837 int ocfs2_getattr(struct vfsmount *mnt,
838 struct dentry *dentry,
841 struct inode *inode = dentry->d_inode;
842 struct super_block *sb = dentry->d_inode->i_sb;
843 struct ocfs2_super *osb = sb->s_fs_info;
848 err = ocfs2_inode_revalidate(dentry);
855 generic_fillattr(inode, stat);
857 /* We set the blksize from the cluster size for performance */
858 stat->blksize = osb->s_clustersize;
866 static int ocfs2_write_remove_suid(struct inode *inode)
869 struct buffer_head *bh = NULL;
870 struct ocfs2_inode_info *oi = OCFS2_I(inode);
871 struct ocfs2_journal_handle *handle;
872 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
873 struct ocfs2_dinode *di;
875 mlog_entry("(Inode %llu, mode 0%o)\n",
876 (unsigned long long)oi->ip_blkno, inode->i_mode);
878 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
879 if (handle == NULL) {
885 ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
891 ret = ocfs2_journal_access(handle, inode, bh,
892 OCFS2_JOURNAL_ACCESS_WRITE);
898 inode->i_mode &= ~S_ISUID;
899 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
900 inode->i_mode &= ~S_ISGID;
902 di = (struct ocfs2_dinode *) bh->b_data;
903 di->i_mode = cpu_to_le16(inode->i_mode);
905 ret = ocfs2_journal_dirty(handle, bh);
911 ocfs2_commit_trans(handle);
917 static inline int ocfs2_write_should_remove_suid(struct inode *inode)
919 mode_t mode = inode->i_mode;
921 if (!capable(CAP_FSETID)) {
922 if (unlikely(mode & S_ISUID))
925 if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
931 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
932 const char __user *buf,
936 struct iovec local_iov = { .iov_base = (void __user *)buf,
938 int ret, rw_level = -1, meta_level = -1, have_alloc_sem = 0;
940 struct file *filp = iocb->ki_filp;
941 struct inode *inode = filp->f_dentry->d_inode;
942 loff_t newsize, saved_pos;
944 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
946 filp->f_dentry->d_name.len,
947 filp->f_dentry->d_name.name);
949 /* happy write of zero bytes */
954 mlog(0, "bad inode\n");
958 mutex_lock(&inode->i_mutex);
959 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
960 if (filp->f_flags & O_DIRECT) {
962 down_read(&inode->i_alloc_sem);
965 /* concurrent O_DIRECT writes are allowed */
966 rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1;
967 ret = ocfs2_rw_lock(inode, rw_level);
975 * We sample i_size under a read level meta lock to see if our write
976 * is extending the file, if it is we back off and get a write level
979 meta_level = (filp->f_flags & O_APPEND) ? 1 : 0;
981 ret = ocfs2_meta_lock(inode, NULL, NULL, meta_level);
988 /* Clear suid / sgid if necessary. We do this here
989 * instead of later in the write path because
990 * remove_suid() calls ->setattr without any hint that
991 * we may have already done our cluster locking. Since
992 * ocfs2_setattr() *must* take cluster locks to
993 * proceeed, this will lead us to recursively lock the
994 * inode. There's also the dinode i_size state which
995 * can be lost via setattr during extending writes (we
996 * set inode->i_size at the end of a write. */
997 if (ocfs2_write_should_remove_suid(inode)) {
998 if (meta_level == 0) {
999 ocfs2_meta_unlock(inode, meta_level);
1004 ret = ocfs2_write_remove_suid(inode);
1011 /* work on a copy of ppos until we're sure that we won't have
1012 * to recalculate it due to relocking. */
1013 if (filp->f_flags & O_APPEND) {
1014 saved_pos = i_size_read(inode);
1015 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
1017 saved_pos = iocb->ki_pos;
1019 newsize = count + saved_pos;
1021 mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
1022 (long long) saved_pos, (long long) newsize,
1023 (long long) i_size_read(inode));
1025 /* No need for a higher level metadata lock if we're
1026 * never going past i_size. */
1027 if (newsize <= i_size_read(inode))
1030 if (meta_level == 0) {
1031 ocfs2_meta_unlock(inode, meta_level);
1036 spin_lock(&OCFS2_I(inode)->ip_lock);
1037 clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) -
1038 OCFS2_I(inode)->ip_clusters;
1039 spin_unlock(&OCFS2_I(inode)->ip_lock);
1041 mlog(0, "Writing at EOF, may need more allocation: "
1042 "i_size = %lld, newsize = %lld, need %u clusters\n",
1043 (long long) i_size_read(inode), (long long) newsize,
1046 /* We only want to continue the rest of this loop if
1047 * our extend will actually require more
1052 ret = ocfs2_extend_allocation(inode, clusters);
1059 /* Fill any holes which would've been created by this
1060 * write. If we're O_APPEND, this will wind up
1061 * (correctly) being a noop. */
1062 ret = ocfs2_zero_extend(inode, (u64) newsize - count);
1070 /* ok, we're done with i_size and alloc work */
1071 iocb->ki_pos = saved_pos;
1072 ocfs2_meta_unlock(inode, meta_level);
1075 /* communicate with ocfs2_dio_end_io */
1076 ocfs2_iocb_set_rw_locked(iocb);
1078 ret = generic_file_aio_write_nolock(iocb, &local_iov, 1, &iocb->ki_pos);
1080 /* buffered aio wouldn't have proper lock coverage today */
1081 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
1084 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
1085 * function pointer which is called when o_direct io completes so that
1086 * it can unlock our rw lock. (it's the clustered equivalent of
1087 * i_alloc_sem; protects truncate from racing with pending ios).
1088 * Unfortunately there are error cases which call end_io and others
1089 * that don't. so we don't have to unlock the rw_lock if either an
1090 * async dio is going to do it in the future or an end_io after an
1091 * error has already done it.
1093 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1099 if (meta_level != -1)
1100 ocfs2_meta_unlock(inode, meta_level);
1102 up_read(&inode->i_alloc_sem);
1104 ocfs2_rw_unlock(inode, rw_level);
1105 mutex_unlock(&inode->i_mutex);
1111 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
1116 int ret = 0, rw_level = -1, have_alloc_sem = 0;
1117 struct file *filp = iocb->ki_filp;
1118 struct inode *inode = filp->f_dentry->d_inode;
1120 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
1121 (unsigned int)count,
1122 filp->f_dentry->d_name.len,
1123 filp->f_dentry->d_name.name);
1132 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
1133 * need locks to protect pending reads from racing with truncate.
1135 if (filp->f_flags & O_DIRECT) {
1136 down_read(&inode->i_alloc_sem);
1139 ret = ocfs2_rw_lock(inode, 0);
1145 /* communicate with ocfs2_dio_end_io */
1146 ocfs2_iocb_set_rw_locked(iocb);
1149 ret = generic_file_aio_read(iocb, buf, count, iocb->ki_pos);
1151 mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n");
1153 /* buffered aio wouldn't have proper lock coverage today */
1154 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
1156 /* see ocfs2_file_aio_write */
1157 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1164 up_read(&inode->i_alloc_sem);
1166 ocfs2_rw_unlock(inode, rw_level);
1172 struct inode_operations ocfs2_file_iops = {
1173 .setattr = ocfs2_setattr,
1174 .getattr = ocfs2_getattr,
1177 struct inode_operations ocfs2_special_file_iops = {
1178 .setattr = ocfs2_setattr,
1179 .getattr = ocfs2_getattr,
1182 const struct file_operations ocfs2_fops = {
1183 .read = do_sync_read,
1184 .write = do_sync_write,
1185 .sendfile = generic_file_sendfile,
1187 .fsync = ocfs2_sync_file,
1188 .release = ocfs2_file_release,
1189 .open = ocfs2_file_open,
1190 .aio_read = ocfs2_file_aio_read,
1191 .aio_write = ocfs2_file_aio_write,
1194 const struct file_operations ocfs2_dops = {
1195 .read = generic_read_dir,
1196 .readdir = ocfs2_readdir,
1197 .fsync = ocfs2_sync_file,