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"
53 #include "buffer_head_io.h"
55 static int ocfs2_sync_inode(struct inode *inode)
57 filemap_fdatawrite(inode->i_mapping);
58 return sync_mapping_buffers(inode->i_mapping);
61 static int ocfs2_file_open(struct inode *inode, struct file *file)
64 int mode = file->f_flags;
65 struct ocfs2_inode_info *oi = OCFS2_I(inode);
67 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
68 file->f_dentry->d_name.len, file->f_dentry->d_name.name);
70 spin_lock(&oi->ip_lock);
72 /* Check that the inode hasn't been wiped from disk by another
73 * node. If it hasn't then we're safe as long as we hold the
74 * spin lock until our increment of open count. */
75 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
76 spin_unlock(&oi->ip_lock);
83 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
86 spin_unlock(&oi->ip_lock);
93 static int ocfs2_file_release(struct inode *inode, struct file *file)
95 struct ocfs2_inode_info *oi = OCFS2_I(inode);
97 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
98 file->f_dentry->d_name.len,
99 file->f_dentry->d_name.name);
101 spin_lock(&oi->ip_lock);
102 if (!--oi->ip_open_count)
103 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
104 spin_unlock(&oi->ip_lock);
111 static int ocfs2_sync_file(struct file *file,
112 struct dentry *dentry,
117 struct inode *inode = dentry->d_inode;
118 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
120 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync,
121 dentry->d_name.len, dentry->d_name.name);
123 err = ocfs2_sync_inode(dentry->d_inode);
127 journal = osb->journal->j_journal;
128 err = journal_force_commit(journal);
133 return (err < 0) ? -EIO : 0;
136 int ocfs2_set_inode_size(struct ocfs2_journal_handle *handle,
138 struct buffer_head *fe_bh,
144 i_size_write(inode, new_i_size);
145 inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size);
146 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
148 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
159 static int ocfs2_simple_size_update(struct inode *inode,
160 struct buffer_head *di_bh,
164 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
165 struct ocfs2_journal_handle *handle = NULL;
167 handle = ocfs2_start_trans(osb, NULL,
168 OCFS2_INODE_UPDATE_CREDITS);
169 if (handle == NULL) {
175 ret = ocfs2_set_inode_size(handle, inode, di_bh,
180 ocfs2_commit_trans(handle);
185 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
187 struct buffer_head *fe_bh,
191 struct ocfs2_journal_handle *handle;
195 /* TODO: This needs to actually orphan the inode in this
198 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
199 if (IS_ERR(handle)) {
200 status = PTR_ERR(handle);
205 status = ocfs2_set_inode_size(handle, inode, fe_bh, new_i_size);
209 ocfs2_commit_trans(handle);
215 static int ocfs2_truncate_file(struct inode *inode,
216 struct buffer_head *di_bh,
220 struct ocfs2_dinode *fe = NULL;
221 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
222 struct ocfs2_truncate_context *tc = NULL;
224 mlog_entry("(inode = %llu, new_i_size = %llu\n",
225 (unsigned long long)OCFS2_I(inode)->ip_blkno,
226 (unsigned long long)new_i_size);
228 truncate_inode_pages(inode->i_mapping, new_i_size);
230 fe = (struct ocfs2_dinode *) di_bh->b_data;
231 if (!OCFS2_IS_VALID_DINODE(fe)) {
232 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
237 mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
238 "Inode %llu, inode i_size = %lld != di "
239 "i_size = %llu, i_flags = 0x%x\n",
240 (unsigned long long)OCFS2_I(inode)->ip_blkno,
242 (unsigned long long)le64_to_cpu(fe->i_size),
243 le32_to_cpu(fe->i_flags));
245 if (new_i_size > le64_to_cpu(fe->i_size)) {
246 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
247 (unsigned long long)le64_to_cpu(fe->i_size),
248 (unsigned long long)new_i_size);
254 mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
255 (unsigned long long)le64_to_cpu(fe->i_blkno),
256 (unsigned long long)le64_to_cpu(fe->i_size),
257 (unsigned long long)new_i_size);
259 /* lets handle the simple truncate cases before doing any more
260 * cluster locking. */
261 if (new_i_size == le64_to_cpu(fe->i_size))
264 /* This forces other nodes to sync and drop their pages. Do
265 * this even if we have a truncate without allocation change -
266 * ocfs2 cluster sizes can be much greater than page size, so
267 * we have to truncate them anyway. */
268 status = ocfs2_data_lock(inode, 1);
273 ocfs2_data_unlock(inode, 1);
275 if (le32_to_cpu(fe->i_clusters) ==
276 ocfs2_clusters_for_bytes(osb->sb, new_i_size)) {
277 mlog(0, "fe->i_clusters = %u, so we do a simple truncate\n",
279 /* No allocation change is required, so lets fast path
281 status = ocfs2_simple_size_update(inode, di_bh, new_i_size);
287 /* alright, we're going to need to do a full blown alloc size
288 * change. Orphan the inode so that recovery can complete the
289 * truncate if necessary. This does the task of marking
291 status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
297 status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
303 status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
309 /* TODO: orphan dir cleanup here. */
317 * extend allocation only here.
318 * we'll update all the disk stuff, and oip->alloc_size
320 * expect stuff to be locked, a transaction started and enough data /
321 * metadata reservations in the contexts.
323 * Will return -EAGAIN, and a reason if a restart is needed.
324 * If passed in, *reason will always be set, even in error.
326 int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
329 struct buffer_head *fe_bh,
330 struct ocfs2_journal_handle *handle,
331 struct ocfs2_alloc_context *data_ac,
332 struct ocfs2_alloc_context *meta_ac,
333 enum ocfs2_alloc_restarted *reason_ret)
337 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
338 enum ocfs2_alloc_restarted reason = RESTART_NONE;
339 u32 bit_off, num_bits;
342 BUG_ON(!clusters_to_add);
344 free_extents = ocfs2_num_free_extents(osb, inode, fe);
345 if (free_extents < 0) {
346 status = free_extents;
351 /* there are two cases which could cause us to EAGAIN in the
352 * we-need-more-metadata case:
353 * 1) we haven't reserved *any*
354 * 2) we are so fragmented, we've needed to add metadata too
356 if (!free_extents && !meta_ac) {
357 mlog(0, "we haven't reserved any metadata!\n");
359 reason = RESTART_META;
361 } else if ((!free_extents)
362 && (ocfs2_alloc_context_bits_left(meta_ac)
363 < ocfs2_extend_meta_needed(fe))) {
364 mlog(0, "filesystem is really fragmented...\n");
366 reason = RESTART_META;
370 status = ocfs2_claim_clusters(osb, handle, data_ac, 1,
371 &bit_off, &num_bits);
373 if (status != -ENOSPC)
378 BUG_ON(num_bits > clusters_to_add);
380 /* reserve our write early -- insert_extent may update the inode */
381 status = ocfs2_journal_access(handle, inode, fe_bh,
382 OCFS2_JOURNAL_ACCESS_WRITE);
388 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
389 mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
390 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
391 status = ocfs2_insert_extent(osb, handle, inode, fe_bh, block,
398 le32_add_cpu(&fe->i_clusters, num_bits);
399 spin_lock(&OCFS2_I(inode)->ip_lock);
400 OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
401 spin_unlock(&OCFS2_I(inode)->ip_lock);
403 status = ocfs2_journal_dirty(handle, fe_bh);
409 clusters_to_add -= num_bits;
411 if (clusters_to_add) {
412 mlog(0, "need to alloc once more, clusters = %u, wanted = "
413 "%u\n", fe->i_clusters, clusters_to_add);
415 reason = RESTART_TRANS;
421 *reason_ret = reason;
425 static int ocfs2_extend_allocation(struct inode *inode,
429 int restart_func = 0;
430 int drop_alloc_sem = 0;
431 int credits, num_free_extents;
433 struct buffer_head *bh = NULL;
434 struct ocfs2_dinode *fe = NULL;
435 struct ocfs2_journal_handle *handle = NULL;
436 struct ocfs2_alloc_context *data_ac = NULL;
437 struct ocfs2_alloc_context *meta_ac = NULL;
438 enum ocfs2_alloc_restarted why;
439 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
441 mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
443 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
444 OCFS2_BH_CACHED, inode);
450 fe = (struct ocfs2_dinode *) bh->b_data;
451 if (!OCFS2_IS_VALID_DINODE(fe)) {
452 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
458 BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
460 mlog(0, "extend inode %llu, i_size = %lld, fe->i_clusters = %u, "
461 "clusters_to_add = %u\n",
462 (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode),
463 fe->i_clusters, clusters_to_add);
465 handle = ocfs2_alloc_handle(osb);
466 if (handle == NULL) {
472 num_free_extents = ocfs2_num_free_extents(osb,
475 if (num_free_extents < 0) {
476 status = num_free_extents;
481 if (!num_free_extents) {
482 status = ocfs2_reserve_new_metadata(osb,
487 if (status != -ENOSPC)
493 status = ocfs2_reserve_clusters(osb,
498 if (status != -ENOSPC)
503 /* blocks peope in read/write from reading our allocation
504 * until we're done changing it. We depend on i_mutex to block
505 * other extend/truncate calls while we're here. Ordering wrt
506 * start_trans is important here -- always do it before! */
507 down_write(&OCFS2_I(inode)->ip_alloc_sem);
510 credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
511 handle = ocfs2_start_trans(osb, handle, credits);
512 if (IS_ERR(handle)) {
513 status = PTR_ERR(handle);
519 restarted_transaction:
520 /* reserve a write to the file entry early on - that we if we
521 * run out of credits in the allocation path, we can still
523 status = ocfs2_journal_access(handle, inode, bh,
524 OCFS2_JOURNAL_ACCESS_WRITE);
530 prev_clusters = OCFS2_I(inode)->ip_clusters;
532 status = ocfs2_do_extend_allocation(osb,
540 if ((status < 0) && (status != -EAGAIN)) {
541 if (status != -ENOSPC)
546 status = ocfs2_journal_dirty(handle, bh);
552 spin_lock(&OCFS2_I(inode)->ip_lock);
553 clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
554 spin_unlock(&OCFS2_I(inode)->ip_lock);
556 if (why != RESTART_NONE && clusters_to_add) {
557 if (why == RESTART_META) {
558 mlog(0, "restarting function.\n");
561 BUG_ON(why != RESTART_TRANS);
563 mlog(0, "restarting transaction.\n");
564 /* TODO: This can be more intelligent. */
565 credits = ocfs2_calc_extend_credits(osb->sb,
568 status = ocfs2_extend_trans(handle, credits);
570 /* handle still has to be committed at
576 goto restarted_transaction;
580 mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
581 fe->i_clusters, (unsigned long long)fe->i_size);
582 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
583 OCFS2_I(inode)->ip_clusters, i_size_read(inode));
586 if (drop_alloc_sem) {
587 up_write(&OCFS2_I(inode)->ip_alloc_sem);
591 ocfs2_commit_trans(handle);
595 ocfs2_free_alloc_context(data_ac);
599 ocfs2_free_alloc_context(meta_ac);
602 if ((!status) && restart_func) {
615 /* Some parts of this taken from generic_cont_expand, which turned out
616 * to be too fragile to do exactly what we need without us having to
617 * worry about recursive locking in ->prepare_write() and
618 * ->commit_write(). */
619 static int ocfs2_write_zero_page(struct inode *inode,
622 struct address_space *mapping = inode->i_mapping;
626 struct ocfs2_journal_handle *handle = NULL;
629 offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
630 /* ugh. in prepare/commit_write, if from==to==start of block, we
631 ** skip the prepare. make sure we never send an offset for the start
634 if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
637 index = size >> PAGE_CACHE_SHIFT;
639 page = grab_cache_page(mapping, index);
646 ret = ocfs2_prepare_write_nolock(inode, page, offset, offset);
652 if (ocfs2_should_order_data(inode)) {
653 handle = ocfs2_start_walk_page_trans(inode, page, offset,
655 if (IS_ERR(handle)) {
656 ret = PTR_ERR(handle);
662 /* must not update i_size! */
663 ret = block_commit_write(page, offset, offset);
670 ocfs2_commit_trans(handle);
673 page_cache_release(page);
678 static int ocfs2_zero_extend(struct inode *inode,
683 struct super_block *sb = inode->i_sb;
685 start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
686 while (start_off < zero_to_size) {
687 ret = ocfs2_write_zero_page(inode, start_off);
693 start_off += sb->s_blocksize;
701 * A tail_to_skip value > 0 indicates that we're being called from
702 * ocfs2_file_aio_write(). This has the following implications:
704 * - we don't want to update i_size
705 * - di_bh will be NULL, which is fine because it's only used in the
706 * case where we want to update i_size.
707 * - ocfs2_zero_extend() will then only be filling the hole created
708 * between i_size and the start of the write.
710 static int ocfs2_extend_file(struct inode *inode,
711 struct buffer_head *di_bh,
718 BUG_ON(!tail_to_skip && !di_bh);
720 /* setattr sometimes calls us like this. */
724 if (i_size_read(inode) == new_i_size)
726 BUG_ON(new_i_size < i_size_read(inode));
728 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) -
729 OCFS2_I(inode)->ip_clusters;
731 if (clusters_to_add) {
733 * protect the pages that ocfs2_zero_extend is going to
734 * be pulling into the page cache.. we do this before the
735 * metadata extend so that we don't get into the situation
736 * where we've extended the metadata but can't get the data
739 ret = ocfs2_data_lock(inode, 1);
745 ret = ocfs2_extend_allocation(inode, clusters_to_add);
751 ret = ocfs2_zero_extend(inode, (u64)new_i_size - tail_to_skip);
759 /* We're being called from ocfs2_setattr() which wants
760 * us to update i_size */
761 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
767 if (clusters_to_add) /* this is the only case in which we lock */
768 ocfs2_data_unlock(inode, 1);
774 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
776 int status = 0, size_change;
777 struct inode *inode = dentry->d_inode;
778 struct super_block *sb = inode->i_sb;
779 struct ocfs2_super *osb = OCFS2_SB(sb);
780 struct buffer_head *bh = NULL;
781 struct ocfs2_journal_handle *handle = NULL;
783 mlog_entry("(0x%p, '%.*s')\n", dentry,
784 dentry->d_name.len, dentry->d_name.name);
786 if (attr->ia_valid & ATTR_MODE)
787 mlog(0, "mode change: %d\n", attr->ia_mode);
788 if (attr->ia_valid & ATTR_UID)
789 mlog(0, "uid change: %d\n", attr->ia_uid);
790 if (attr->ia_valid & ATTR_GID)
791 mlog(0, "gid change: %d\n", attr->ia_gid);
792 if (attr->ia_valid & ATTR_SIZE)
793 mlog(0, "size change...\n");
794 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
795 mlog(0, "time change...\n");
797 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
798 | ATTR_GID | ATTR_UID | ATTR_MODE)
799 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
800 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
804 status = inode_change_ok(inode, attr);
808 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
810 status = ocfs2_rw_lock(inode, 1);
817 status = ocfs2_meta_lock(inode, NULL, &bh, 1);
819 if (status != -ENOENT)
824 if (size_change && attr->ia_size != i_size_read(inode)) {
825 if (i_size_read(inode) > attr->ia_size)
826 status = ocfs2_truncate_file(inode, bh, attr->ia_size);
828 status = ocfs2_extend_file(inode, bh, attr->ia_size, 0);
830 if (status != -ENOSPC)
837 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
838 if (IS_ERR(handle)) {
839 status = PTR_ERR(handle);
844 status = inode_setattr(inode, attr);
850 status = ocfs2_mark_inode_dirty(handle, inode, bh);
855 ocfs2_commit_trans(handle);
857 ocfs2_meta_unlock(inode, 1);
860 ocfs2_rw_unlock(inode, 1);
869 int ocfs2_getattr(struct vfsmount *mnt,
870 struct dentry *dentry,
873 struct inode *inode = dentry->d_inode;
874 struct super_block *sb = dentry->d_inode->i_sb;
875 struct ocfs2_super *osb = sb->s_fs_info;
880 err = ocfs2_inode_revalidate(dentry);
887 generic_fillattr(inode, stat);
889 /* We set the blksize from the cluster size for performance */
890 stat->blksize = osb->s_clustersize;
898 static int ocfs2_write_remove_suid(struct inode *inode)
901 struct buffer_head *bh = NULL;
902 struct ocfs2_inode_info *oi = OCFS2_I(inode);
903 struct ocfs2_journal_handle *handle;
904 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
905 struct ocfs2_dinode *di;
907 mlog_entry("(Inode %llu, mode 0%o)\n",
908 (unsigned long long)oi->ip_blkno, inode->i_mode);
910 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
911 if (handle == NULL) {
917 ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
923 ret = ocfs2_journal_access(handle, inode, bh,
924 OCFS2_JOURNAL_ACCESS_WRITE);
930 inode->i_mode &= ~S_ISUID;
931 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
932 inode->i_mode &= ~S_ISGID;
934 di = (struct ocfs2_dinode *) bh->b_data;
935 di->i_mode = cpu_to_le16(inode->i_mode);
937 ret = ocfs2_journal_dirty(handle, bh);
943 ocfs2_commit_trans(handle);
949 static inline int ocfs2_write_should_remove_suid(struct inode *inode)
951 mode_t mode = inode->i_mode;
953 if (!capable(CAP_FSETID)) {
954 if (unlikely(mode & S_ISUID))
957 if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
963 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
964 const char __user *buf,
968 struct iovec local_iov = { .iov_base = (void __user *)buf,
970 int ret, rw_level = -1, meta_level = -1, have_alloc_sem = 0;
972 struct file *filp = iocb->ki_filp;
973 struct inode *inode = filp->f_dentry->d_inode;
974 loff_t newsize, saved_pos;
976 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
978 filp->f_dentry->d_name.len,
979 filp->f_dentry->d_name.name);
981 /* happy write of zero bytes */
986 mlog(0, "bad inode\n");
990 mutex_lock(&inode->i_mutex);
991 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
992 if (filp->f_flags & O_DIRECT) {
994 down_read(&inode->i_alloc_sem);
997 /* concurrent O_DIRECT writes are allowed */
998 rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1;
999 ret = ocfs2_rw_lock(inode, rw_level);
1007 * We sample i_size under a read level meta lock to see if our write
1008 * is extending the file, if it is we back off and get a write level
1011 meta_level = (filp->f_flags & O_APPEND) ? 1 : 0;
1013 ret = ocfs2_meta_lock(inode, NULL, NULL, meta_level);
1020 /* Clear suid / sgid if necessary. We do this here
1021 * instead of later in the write path because
1022 * remove_suid() calls ->setattr without any hint that
1023 * we may have already done our cluster locking. Since
1024 * ocfs2_setattr() *must* take cluster locks to
1025 * proceeed, this will lead us to recursively lock the
1026 * inode. There's also the dinode i_size state which
1027 * can be lost via setattr during extending writes (we
1028 * set inode->i_size at the end of a write. */
1029 if (ocfs2_write_should_remove_suid(inode)) {
1030 if (meta_level == 0) {
1031 ocfs2_meta_unlock(inode, meta_level);
1036 ret = ocfs2_write_remove_suid(inode);
1043 /* work on a copy of ppos until we're sure that we won't have
1044 * to recalculate it due to relocking. */
1045 if (filp->f_flags & O_APPEND) {
1046 saved_pos = i_size_read(inode);
1047 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
1049 saved_pos = iocb->ki_pos;
1051 newsize = count + saved_pos;
1053 mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
1054 (long long) saved_pos, (long long) newsize,
1055 (long long) i_size_read(inode));
1057 /* No need for a higher level metadata lock if we're
1058 * never going past i_size. */
1059 if (newsize <= i_size_read(inode))
1062 if (meta_level == 0) {
1063 ocfs2_meta_unlock(inode, meta_level);
1068 spin_lock(&OCFS2_I(inode)->ip_lock);
1069 clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) -
1070 OCFS2_I(inode)->ip_clusters;
1071 spin_unlock(&OCFS2_I(inode)->ip_lock);
1073 mlog(0, "Writing at EOF, may need more allocation: "
1074 "i_size = %lld, newsize = %lld, need %u clusters\n",
1075 (long long) i_size_read(inode), (long long) newsize,
1078 /* We only want to continue the rest of this loop if
1079 * our extend will actually require more
1084 ret = ocfs2_extend_file(inode, NULL, newsize, count);
1093 /* ok, we're done with i_size and alloc work */
1094 iocb->ki_pos = saved_pos;
1095 ocfs2_meta_unlock(inode, meta_level);
1098 /* communicate with ocfs2_dio_end_io */
1099 ocfs2_iocb_set_rw_locked(iocb);
1101 ret = generic_file_aio_write_nolock(iocb, &local_iov, 1, &iocb->ki_pos);
1103 /* buffered aio wouldn't have proper lock coverage today */
1104 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
1107 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
1108 * function pointer which is called when o_direct io completes so that
1109 * it can unlock our rw lock. (it's the clustered equivalent of
1110 * i_alloc_sem; protects truncate from racing with pending ios).
1111 * Unfortunately there are error cases which call end_io and others
1112 * that don't. so we don't have to unlock the rw_lock if either an
1113 * async dio is going to do it in the future or an end_io after an
1114 * error has already done it.
1116 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1122 if (meta_level != -1)
1123 ocfs2_meta_unlock(inode, meta_level);
1125 up_read(&inode->i_alloc_sem);
1127 ocfs2_rw_unlock(inode, rw_level);
1128 mutex_unlock(&inode->i_mutex);
1134 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
1139 int ret = 0, rw_level = -1, have_alloc_sem = 0;
1140 struct file *filp = iocb->ki_filp;
1141 struct inode *inode = filp->f_dentry->d_inode;
1143 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
1144 (unsigned int)count,
1145 filp->f_dentry->d_name.len,
1146 filp->f_dentry->d_name.name);
1155 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
1156 * need locks to protect pending reads from racing with truncate.
1158 if (filp->f_flags & O_DIRECT) {
1159 down_read(&inode->i_alloc_sem);
1162 ret = ocfs2_rw_lock(inode, 0);
1168 /* communicate with ocfs2_dio_end_io */
1169 ocfs2_iocb_set_rw_locked(iocb);
1173 * We're fine letting folks race truncates and extending
1174 * writes with read across the cluster, just like they can
1175 * locally. Hence no rw_lock during read.
1177 * Take and drop the meta data lock to update inode fields
1178 * like i_size. This allows the checks down below
1179 * generic_file_aio_read() a chance of actually working.
1181 ret = ocfs2_meta_lock(inode, NULL, NULL, 0);
1186 ocfs2_meta_unlock(inode, 0);
1188 ret = generic_file_aio_read(iocb, buf, count, iocb->ki_pos);
1190 mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n");
1192 /* buffered aio wouldn't have proper lock coverage today */
1193 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
1195 /* see ocfs2_file_aio_write */
1196 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1203 up_read(&inode->i_alloc_sem);
1205 ocfs2_rw_unlock(inode, rw_level);
1211 struct inode_operations ocfs2_file_iops = {
1212 .setattr = ocfs2_setattr,
1213 .getattr = ocfs2_getattr,
1216 struct inode_operations ocfs2_special_file_iops = {
1217 .setattr = ocfs2_setattr,
1218 .getattr = ocfs2_getattr,
1221 const struct file_operations ocfs2_fops = {
1222 .read = do_sync_read,
1223 .write = do_sync_write,
1224 .sendfile = generic_file_sendfile,
1226 .fsync = ocfs2_sync_file,
1227 .release = ocfs2_file_release,
1228 .open = ocfs2_file_open,
1229 .aio_read = ocfs2_file_aio_read,
1230 .aio_write = ocfs2_file_aio_write,
1231 .ioctl = ocfs2_ioctl,
1234 const struct file_operations ocfs2_dops = {
1235 .read = generic_read_dir,
1236 .readdir = ocfs2_readdir,
1237 .fsync = ocfs2_sync_file,
1238 .ioctl = ocfs2_ioctl,