1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * File open, close, extend, truncate
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
26 #include <linux/capability.h>
28 #include <linux/types.h>
29 #include <linux/slab.h>
30 #include <linux/highmem.h>
31 #include <linux/pagemap.h>
32 #include <linux/uio.h>
33 #include <linux/sched.h>
34 #include <linux/splice.h>
35 #include <linux/mount.h>
36 #include <linux/writeback.h>
37 #include <linux/falloc.h>
38 #include <linux/quotaops.h>
39 #include <linux/blkdev.h>
41 #define MLOG_MASK_PREFIX ML_INODE
42 #include <cluster/masklog.h>
50 #include "extent_map.h"
63 #include "refcounttree.h"
65 #include "buffer_head_io.h"
67 static int ocfs2_init_file_private(struct inode *inode, struct file *file)
69 struct ocfs2_file_private *fp;
71 fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
76 mutex_init(&fp->fp_mutex);
77 ocfs2_file_lock_res_init(&fp->fp_flock, fp);
78 file->private_data = fp;
83 static void ocfs2_free_file_private(struct inode *inode, struct file *file)
85 struct ocfs2_file_private *fp = file->private_data;
86 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
89 ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
90 ocfs2_lock_res_free(&fp->fp_flock);
92 file->private_data = NULL;
96 static int ocfs2_file_open(struct inode *inode, struct file *file)
99 int mode = file->f_flags;
100 struct ocfs2_inode_info *oi = OCFS2_I(inode);
102 mlog(0, "(0x%p, 0x%p, '%.*s')\n", inode, file,
103 file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name);
105 if (file->f_mode & FMODE_WRITE)
106 dquot_initialize(inode);
108 spin_lock(&oi->ip_lock);
110 /* Check that the inode hasn't been wiped from disk by another
111 * node. If it hasn't then we're safe as long as we hold the
112 * spin lock until our increment of open count. */
113 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
114 spin_unlock(&oi->ip_lock);
121 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
124 spin_unlock(&oi->ip_lock);
126 status = ocfs2_init_file_private(inode, file);
129 * We want to set open count back if we're failing the
132 spin_lock(&oi->ip_lock);
134 spin_unlock(&oi->ip_lock);
141 static int ocfs2_file_release(struct inode *inode, struct file *file)
143 struct ocfs2_inode_info *oi = OCFS2_I(inode);
145 mlog(0, "(0x%p, 0x%p, '%.*s')\n", inode, file,
146 file->f_path.dentry->d_name.len,
147 file->f_path.dentry->d_name.name);
149 spin_lock(&oi->ip_lock);
150 if (!--oi->ip_open_count)
151 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
152 spin_unlock(&oi->ip_lock);
154 ocfs2_free_file_private(inode, file);
159 static int ocfs2_dir_open(struct inode *inode, struct file *file)
161 return ocfs2_init_file_private(inode, file);
164 static int ocfs2_dir_release(struct inode *inode, struct file *file)
166 ocfs2_free_file_private(inode, file);
170 static int ocfs2_sync_file(struct file *file, int datasync)
174 struct inode *inode = file->f_mapping->host;
175 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
177 mlog(0, "(0x%p, %d, 0x%p, '%.*s')\n", file, datasync,
178 file->f_path.dentry, file->f_path.dentry->d_name.len,
179 file->f_path.dentry->d_name.name);
181 if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) {
183 * We still have to flush drive's caches to get data to the
186 if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
187 blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
191 journal = osb->journal->j_journal;
192 err = jbd2_journal_force_commit(journal);
198 return (err < 0) ? -EIO : 0;
201 int ocfs2_should_update_atime(struct inode *inode,
202 struct vfsmount *vfsmnt)
205 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
207 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
210 if ((inode->i_flags & S_NOATIME) ||
211 ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
215 * We can be called with no vfsmnt structure - NFSD will
218 * Note that our action here is different than touch_atime() -
219 * if we can't tell whether this is a noatime mount, then we
220 * don't know whether to trust the value of s_atime_quantum.
225 if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
226 ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
229 if (vfsmnt->mnt_flags & MNT_RELATIME) {
230 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
231 (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
238 if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
244 int ocfs2_update_inode_atime(struct inode *inode,
245 struct buffer_head *bh)
248 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
250 struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
252 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
253 if (IS_ERR(handle)) {
254 ret = PTR_ERR(handle);
259 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
260 OCFS2_JOURNAL_ACCESS_WRITE);
267 * Don't use ocfs2_mark_inode_dirty() here as we don't always
268 * have i_mutex to guard against concurrent changes to other
271 inode->i_atime = CURRENT_TIME;
272 di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
273 di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
274 ocfs2_journal_dirty(handle, bh);
277 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
282 static int ocfs2_set_inode_size(handle_t *handle,
284 struct buffer_head *fe_bh,
289 i_size_write(inode, new_i_size);
290 inode->i_blocks = ocfs2_inode_sector_count(inode);
291 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
293 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
303 int ocfs2_simple_size_update(struct inode *inode,
304 struct buffer_head *di_bh,
308 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
309 handle_t *handle = NULL;
311 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
312 if (IS_ERR(handle)) {
313 ret = PTR_ERR(handle);
318 ret = ocfs2_set_inode_size(handle, inode, di_bh,
323 ocfs2_commit_trans(osb, handle);
328 static int ocfs2_cow_file_pos(struct inode *inode,
329 struct buffer_head *fe_bh,
333 u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
334 unsigned int num_clusters = 0;
335 unsigned int ext_flags = 0;
338 * If the new offset is aligned to the range of the cluster, there is
339 * no space for ocfs2_zero_range_for_truncate to fill, so no need to
342 if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
345 status = ocfs2_get_clusters(inode, cpos, &phys,
346 &num_clusters, &ext_flags);
352 if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
355 return ocfs2_refcount_cow(inode, NULL, fe_bh, cpos, 1, cpos+1);
361 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
363 struct buffer_head *fe_bh,
368 struct ocfs2_dinode *di;
372 * We need to CoW the cluster contains the offset if it is reflinked
373 * since we will call ocfs2_zero_range_for_truncate later which will
374 * write "0" from offset to the end of the cluster.
376 status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
382 /* TODO: This needs to actually orphan the inode in this
385 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
386 if (IS_ERR(handle)) {
387 status = PTR_ERR(handle);
392 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
393 OCFS2_JOURNAL_ACCESS_WRITE);
400 * Do this before setting i_size.
402 cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
403 status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
410 i_size_write(inode, new_i_size);
411 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
413 di = (struct ocfs2_dinode *) fe_bh->b_data;
414 di->i_size = cpu_to_le64(new_i_size);
415 di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
416 di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
418 ocfs2_journal_dirty(handle, fe_bh);
421 ocfs2_commit_trans(osb, handle);
426 static int ocfs2_truncate_file(struct inode *inode,
427 struct buffer_head *di_bh,
431 struct ocfs2_dinode *fe = NULL;
432 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
434 mlog(0, "(inode = %llu, new_i_size = %llu\n",
435 (unsigned long long)OCFS2_I(inode)->ip_blkno,
436 (unsigned long long)new_i_size);
438 /* We trust di_bh because it comes from ocfs2_inode_lock(), which
439 * already validated it */
440 fe = (struct ocfs2_dinode *) di_bh->b_data;
442 mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
443 "Inode %llu, inode i_size = %lld != di "
444 "i_size = %llu, i_flags = 0x%x\n",
445 (unsigned long long)OCFS2_I(inode)->ip_blkno,
447 (unsigned long long)le64_to_cpu(fe->i_size),
448 le32_to_cpu(fe->i_flags));
450 if (new_i_size > le64_to_cpu(fe->i_size)) {
451 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
452 (unsigned long long)le64_to_cpu(fe->i_size),
453 (unsigned long long)new_i_size);
459 mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
460 (unsigned long long)le64_to_cpu(fe->i_blkno),
461 (unsigned long long)le64_to_cpu(fe->i_size),
462 (unsigned long long)new_i_size);
464 /* lets handle the simple truncate cases before doing any more
465 * cluster locking. */
466 if (new_i_size == le64_to_cpu(fe->i_size))
469 down_write(&OCFS2_I(inode)->ip_alloc_sem);
471 ocfs2_resv_discard(&osb->osb_la_resmap,
472 &OCFS2_I(inode)->ip_la_data_resv);
475 * The inode lock forced other nodes to sync and drop their
476 * pages, which (correctly) happens even if we have a truncate
477 * without allocation change - ocfs2 cluster sizes can be much
478 * greater than page size, so we have to truncate them
481 unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
482 truncate_inode_pages(inode->i_mapping, new_i_size);
484 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
485 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
486 i_size_read(inode), 1);
490 goto bail_unlock_sem;
493 /* alright, we're going to need to do a full blown alloc size
494 * change. Orphan the inode so that recovery can complete the
495 * truncate if necessary. This does the task of marking
497 status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
500 goto bail_unlock_sem;
503 status = ocfs2_commit_truncate(osb, inode, di_bh);
506 goto bail_unlock_sem;
509 /* TODO: orphan dir cleanup here. */
511 up_write(&OCFS2_I(inode)->ip_alloc_sem);
514 if (!status && OCFS2_I(inode)->ip_clusters == 0)
515 status = ocfs2_try_remove_refcount_tree(inode, di_bh);
521 * extend file allocation only here.
522 * we'll update all the disk stuff, and oip->alloc_size
524 * expect stuff to be locked, a transaction started and enough data /
525 * metadata reservations in the contexts.
527 * Will return -EAGAIN, and a reason if a restart is needed.
528 * If passed in, *reason will always be set, even in error.
530 int ocfs2_add_inode_data(struct ocfs2_super *osb,
535 struct buffer_head *fe_bh,
537 struct ocfs2_alloc_context *data_ac,
538 struct ocfs2_alloc_context *meta_ac,
539 enum ocfs2_alloc_restarted *reason_ret)
542 struct ocfs2_extent_tree et;
544 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
545 ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
546 clusters_to_add, mark_unwritten,
547 data_ac, meta_ac, reason_ret);
552 static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
553 u32 clusters_to_add, int mark_unwritten)
556 int restart_func = 0;
559 struct buffer_head *bh = NULL;
560 struct ocfs2_dinode *fe = NULL;
561 handle_t *handle = NULL;
562 struct ocfs2_alloc_context *data_ac = NULL;
563 struct ocfs2_alloc_context *meta_ac = NULL;
564 enum ocfs2_alloc_restarted why;
565 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
566 struct ocfs2_extent_tree et;
569 mlog(0, "(clusters_to_add = %u)\n", clusters_to_add);
572 * This function only exists for file systems which don't
575 BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
577 status = ocfs2_read_inode_block(inode, &bh);
582 fe = (struct ocfs2_dinode *) bh->b_data;
585 BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
587 mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
588 "clusters_to_add = %u\n",
589 (unsigned long long)OCFS2_I(inode)->ip_blkno,
590 (long long)i_size_read(inode), le32_to_cpu(fe->i_clusters),
592 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
593 status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
600 credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list,
602 handle = ocfs2_start_trans(osb, credits);
603 if (IS_ERR(handle)) {
604 status = PTR_ERR(handle);
610 restarted_transaction:
611 status = dquot_alloc_space_nodirty(inode,
612 ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
617 /* reserve a write to the file entry early on - that we if we
618 * run out of credits in the allocation path, we can still
620 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
621 OCFS2_JOURNAL_ACCESS_WRITE);
627 prev_clusters = OCFS2_I(inode)->ip_clusters;
629 status = ocfs2_add_inode_data(osb,
639 if ((status < 0) && (status != -EAGAIN)) {
640 if (status != -ENOSPC)
645 ocfs2_journal_dirty(handle, bh);
647 spin_lock(&OCFS2_I(inode)->ip_lock);
648 clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
649 spin_unlock(&OCFS2_I(inode)->ip_lock);
650 /* Release unused quota reservation */
651 dquot_free_space(inode,
652 ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
655 if (why != RESTART_NONE && clusters_to_add) {
656 if (why == RESTART_META) {
657 mlog(0, "restarting function.\n");
661 BUG_ON(why != RESTART_TRANS);
663 mlog(0, "restarting transaction.\n");
664 /* TODO: This can be more intelligent. */
665 credits = ocfs2_calc_extend_credits(osb->sb,
668 status = ocfs2_extend_trans(handle, credits);
670 /* handle still has to be committed at
676 goto restarted_transaction;
680 mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
681 le32_to_cpu(fe->i_clusters),
682 (unsigned long long)le64_to_cpu(fe->i_size));
683 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
684 OCFS2_I(inode)->ip_clusters, (long long)i_size_read(inode));
687 if (status < 0 && did_quota)
688 dquot_free_space(inode,
689 ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
691 ocfs2_commit_trans(osb, handle);
695 ocfs2_free_alloc_context(data_ac);
699 ocfs2_free_alloc_context(meta_ac);
702 if ((!status) && restart_func) {
713 * While a write will already be ordering the data, a truncate will not.
714 * Thus, we need to explicitly order the zeroed pages.
716 static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode)
718 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
719 handle_t *handle = NULL;
722 if (!ocfs2_should_order_data(inode))
725 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
726 if (IS_ERR(handle)) {
732 ret = ocfs2_jbd2_file_inode(handle, inode);
739 ocfs2_commit_trans(osb, handle);
740 handle = ERR_PTR(ret);
745 /* Some parts of this taken from generic_cont_expand, which turned out
746 * to be too fragile to do exactly what we need without us having to
747 * worry about recursive locking in ->write_begin() and ->write_end(). */
748 static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
751 struct address_space *mapping = inode->i_mapping;
753 unsigned long index = abs_from >> PAGE_CACHE_SHIFT;
754 handle_t *handle = NULL;
756 unsigned zero_from, zero_to, block_start, block_end;
758 BUG_ON(abs_from >= abs_to);
759 BUG_ON(abs_to > (((u64)index + 1) << PAGE_CACHE_SHIFT));
760 BUG_ON(abs_from & (inode->i_blkbits - 1));
762 page = find_or_create_page(mapping, index, GFP_NOFS);
769 /* Get the offsets within the page that we want to zero */
770 zero_from = abs_from & (PAGE_CACHE_SIZE - 1);
771 zero_to = abs_to & (PAGE_CACHE_SIZE - 1);
773 zero_to = PAGE_CACHE_SIZE;
776 "abs_from = %llu, abs_to = %llu, index = %lu, zero_from = %u, zero_to = %u\n",
777 (unsigned long long)abs_from, (unsigned long long)abs_to,
778 index, zero_from, zero_to);
780 /* We know that zero_from is block aligned */
781 for (block_start = zero_from; block_start < zero_to;
782 block_start = block_end) {
783 block_end = block_start + (1 << inode->i_blkbits);
786 * block_start is block-aligned. Bump it by one to force
787 * __block_write_begin and block_commit_write to zero the
790 ret = __block_write_begin(page, block_start + 1, 0,
798 handle = ocfs2_zero_start_ordered_transaction(inode);
799 if (IS_ERR(handle)) {
800 ret = PTR_ERR(handle);
806 /* must not update i_size! */
807 ret = block_commit_write(page, block_start + 1,
816 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
820 page_cache_release(page);
826 * Find the next range to zero. We do this in terms of bytes because
827 * that's what ocfs2_zero_extend() wants, and it is dealing with the
828 * pagecache. We may return multiple extents.
830 * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
831 * needs to be zeroed. range_start and range_end return the next zeroing
832 * range. A subsequent call should pass the previous range_end as its
833 * zero_start. If range_end is 0, there's nothing to do.
835 * Unwritten extents are skipped over. Refcounted extents are CoWd.
837 static int ocfs2_zero_extend_get_range(struct inode *inode,
838 struct buffer_head *di_bh,
839 u64 zero_start, u64 zero_end,
840 u64 *range_start, u64 *range_end)
842 int rc = 0, needs_cow = 0;
843 u32 p_cpos, zero_clusters = 0;
845 zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
846 u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
847 unsigned int num_clusters = 0;
848 unsigned int ext_flags = 0;
850 while (zero_cpos < last_cpos) {
851 rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
852 &num_clusters, &ext_flags);
858 if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
859 zero_clusters = num_clusters;
860 if (ext_flags & OCFS2_EXT_REFCOUNTED)
865 zero_cpos += num_clusters;
867 if (!zero_clusters) {
872 while ((zero_cpos + zero_clusters) < last_cpos) {
873 rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
874 &p_cpos, &num_clusters,
881 if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
883 if (ext_flags & OCFS2_EXT_REFCOUNTED)
885 zero_clusters += num_clusters;
887 if ((zero_cpos + zero_clusters) > last_cpos)
888 zero_clusters = last_cpos - zero_cpos;
891 rc = ocfs2_refcount_cow(inode, NULL, di_bh, zero_cpos,
892 zero_clusters, UINT_MAX);
899 *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
900 *range_end = ocfs2_clusters_to_bytes(inode->i_sb,
901 zero_cpos + zero_clusters);
908 * Zero one range returned from ocfs2_zero_extend_get_range(). The caller
909 * has made sure that the entire range needs zeroing.
911 static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
916 u64 zero_pos = range_start;
918 mlog(0, "range_start = %llu, range_end = %llu\n",
919 (unsigned long long)range_start,
920 (unsigned long long)range_end);
921 BUG_ON(range_start >= range_end);
923 while (zero_pos < range_end) {
924 next_pos = (zero_pos & PAGE_CACHE_MASK) + PAGE_CACHE_SIZE;
925 if (next_pos > range_end)
926 next_pos = range_end;
927 rc = ocfs2_write_zero_page(inode, zero_pos, next_pos);
935 * Very large extends have the potential to lock up
936 * the cpu for extended periods of time.
944 int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
948 u64 zero_start, range_start = 0, range_end = 0;
949 struct super_block *sb = inode->i_sb;
951 zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
952 mlog(0, "zero_start %llu for i_size %llu\n",
953 (unsigned long long)zero_start,
954 (unsigned long long)i_size_read(inode));
955 while (zero_start < zero_to_size) {
956 ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
967 if (range_start < zero_start)
968 range_start = zero_start;
969 if (range_end > zero_to_size)
970 range_end = zero_to_size;
972 ret = ocfs2_zero_extend_range(inode, range_start,
978 zero_start = range_end;
984 int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
985 u64 new_i_size, u64 zero_to)
989 struct ocfs2_inode_info *oi = OCFS2_I(inode);
992 * Only quota files call this without a bh, and they can't be
995 BUG_ON(!di_bh && (oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
996 BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
998 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
999 if (clusters_to_add < oi->ip_clusters)
1000 clusters_to_add = 0;
1002 clusters_to_add -= oi->ip_clusters;
1004 if (clusters_to_add) {
1005 ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
1006 clusters_to_add, 0);
1014 * Call this even if we don't add any clusters to the tree. We
1015 * still need to zero the area between the old i_size and the
1018 ret = ocfs2_zero_extend(inode, di_bh, zero_to);
1026 static int ocfs2_extend_file(struct inode *inode,
1027 struct buffer_head *di_bh,
1031 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1035 /* setattr sometimes calls us like this. */
1036 if (new_i_size == 0)
1039 if (i_size_read(inode) == new_i_size)
1041 BUG_ON(new_i_size < i_size_read(inode));
1044 * The alloc sem blocks people in read/write from reading our
1045 * allocation until we're done changing it. We depend on
1046 * i_mutex to block other extend/truncate calls while we're
1047 * here. We even have to hold it for sparse files because there
1048 * might be some tail zeroing.
1050 down_write(&oi->ip_alloc_sem);
1052 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1054 * We can optimize small extends by keeping the inodes
1057 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1058 up_write(&oi->ip_alloc_sem);
1059 goto out_update_size;
1062 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1064 up_write(&oi->ip_alloc_sem);
1070 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1071 ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1073 ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1076 up_write(&oi->ip_alloc_sem);
1084 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1092 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1094 int status = 0, size_change;
1095 struct inode *inode = dentry->d_inode;
1096 struct super_block *sb = inode->i_sb;
1097 struct ocfs2_super *osb = OCFS2_SB(sb);
1098 struct buffer_head *bh = NULL;
1099 handle_t *handle = NULL;
1100 struct dquot *transfer_to[MAXQUOTAS] = { };
1103 mlog(0, "(0x%p, '%.*s')\n", dentry,
1104 dentry->d_name.len, dentry->d_name.name);
1106 /* ensuring we don't even attempt to truncate a symlink */
1107 if (S_ISLNK(inode->i_mode))
1108 attr->ia_valid &= ~ATTR_SIZE;
1110 if (attr->ia_valid & ATTR_MODE)
1111 mlog(0, "mode change: %d\n", attr->ia_mode);
1112 if (attr->ia_valid & ATTR_UID)
1113 mlog(0, "uid change: %d\n", attr->ia_uid);
1114 if (attr->ia_valid & ATTR_GID)
1115 mlog(0, "gid change: %d\n", attr->ia_gid);
1116 if (attr->ia_valid & ATTR_SIZE)
1117 mlog(0, "size change...\n");
1118 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
1119 mlog(0, "time change...\n");
1121 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1122 | ATTR_GID | ATTR_UID | ATTR_MODE)
1123 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
1124 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
1128 status = inode_change_ok(inode, attr);
1132 if (is_quota_modification(inode, attr))
1133 dquot_initialize(inode);
1134 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1136 status = ocfs2_rw_lock(inode, 1);
1143 status = ocfs2_inode_lock(inode, &bh, 1);
1145 if (status != -ENOENT)
1147 goto bail_unlock_rw;
1150 if (size_change && attr->ia_size != i_size_read(inode)) {
1151 status = inode_newsize_ok(inode, attr->ia_size);
1155 if (i_size_read(inode) > attr->ia_size) {
1156 if (ocfs2_should_order_data(inode)) {
1157 status = ocfs2_begin_ordered_truncate(inode,
1162 status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1164 status = ocfs2_extend_file(inode, bh, attr->ia_size);
1166 if (status != -ENOSPC)
1173 if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
1174 (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
1176 * Gather pointers to quota structures so that allocation /
1177 * freeing of quota structures happens here and not inside
1178 * dquot_transfer() where we have problems with lock ordering
1180 if (attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid
1181 && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1182 OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1183 transfer_to[USRQUOTA] = dqget(sb, attr->ia_uid,
1185 if (!transfer_to[USRQUOTA]) {
1190 if (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid
1191 && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1192 OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1193 transfer_to[GRPQUOTA] = dqget(sb, attr->ia_gid,
1195 if (!transfer_to[GRPQUOTA]) {
1200 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1201 2 * ocfs2_quota_trans_credits(sb));
1202 if (IS_ERR(handle)) {
1203 status = PTR_ERR(handle);
1207 status = __dquot_transfer(inode, transfer_to);
1211 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1212 if (IS_ERR(handle)) {
1213 status = PTR_ERR(handle);
1220 * This will intentionally not wind up calling truncate_setsize(),
1221 * since all the work for a size change has been done above.
1222 * Otherwise, we could get into problems with truncate as
1223 * ip_alloc_sem is used there to protect against i_size
1226 * XXX: this means the conditional below can probably be removed.
1228 if ((attr->ia_valid & ATTR_SIZE) &&
1229 attr->ia_size != i_size_read(inode)) {
1230 status = vmtruncate(inode, attr->ia_size);
1237 setattr_copy(inode, attr);
1238 mark_inode_dirty(inode);
1240 status = ocfs2_mark_inode_dirty(handle, inode, bh);
1245 ocfs2_commit_trans(osb, handle);
1247 ocfs2_inode_unlock(inode, 1);
1250 ocfs2_rw_unlock(inode, 1);
1254 /* Release quota pointers in case we acquired them */
1255 for (qtype = 0; qtype < MAXQUOTAS; qtype++)
1256 dqput(transfer_to[qtype]);
1258 if (!status && attr->ia_valid & ATTR_MODE) {
1259 status = ocfs2_acl_chmod(inode);
1267 int ocfs2_getattr(struct vfsmount *mnt,
1268 struct dentry *dentry,
1271 struct inode *inode = dentry->d_inode;
1272 struct super_block *sb = dentry->d_inode->i_sb;
1273 struct ocfs2_super *osb = sb->s_fs_info;
1276 err = ocfs2_inode_revalidate(dentry);
1283 generic_fillattr(inode, stat);
1285 /* We set the blksize from the cluster size for performance */
1286 stat->blksize = osb->s_clustersize;
1292 int ocfs2_permission(struct inode *inode, int mask, unsigned int flags)
1296 if (flags & IPERM_FLAG_RCU)
1299 ret = ocfs2_inode_lock(inode, NULL, 0);
1306 ret = generic_permission(inode, mask, flags, ocfs2_check_acl);
1308 ocfs2_inode_unlock(inode, 0);
1313 static int __ocfs2_write_remove_suid(struct inode *inode,
1314 struct buffer_head *bh)
1318 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1319 struct ocfs2_dinode *di;
1321 mlog(0, "(Inode %llu, mode 0%o)\n",
1322 (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
1324 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1325 if (IS_ERR(handle)) {
1326 ret = PTR_ERR(handle);
1331 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1332 OCFS2_JOURNAL_ACCESS_WRITE);
1338 inode->i_mode &= ~S_ISUID;
1339 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1340 inode->i_mode &= ~S_ISGID;
1342 di = (struct ocfs2_dinode *) bh->b_data;
1343 di->i_mode = cpu_to_le16(inode->i_mode);
1345 ocfs2_journal_dirty(handle, bh);
1348 ocfs2_commit_trans(osb, handle);
1354 * Will look for holes and unwritten extents in the range starting at
1355 * pos for count bytes (inclusive).
1357 static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1361 unsigned int extent_flags;
1362 u32 cpos, clusters, extent_len, phys_cpos;
1363 struct super_block *sb = inode->i_sb;
1365 cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1366 clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1369 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1376 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1381 if (extent_len > clusters)
1382 extent_len = clusters;
1384 clusters -= extent_len;
1391 static int ocfs2_write_remove_suid(struct inode *inode)
1394 struct buffer_head *bh = NULL;
1396 ret = ocfs2_read_inode_block(inode, &bh);
1402 ret = __ocfs2_write_remove_suid(inode, bh);
1409 * Allocate enough extents to cover the region starting at byte offset
1410 * start for len bytes. Existing extents are skipped, any extents
1411 * added are marked as "unwritten".
1413 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1417 u32 cpos, phys_cpos, clusters, alloc_size;
1418 u64 end = start + len;
1419 struct buffer_head *di_bh = NULL;
1421 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1422 ret = ocfs2_read_inode_block(inode, &di_bh);
1429 * Nothing to do if the requested reservation range
1430 * fits within the inode.
1432 if (ocfs2_size_fits_inline_data(di_bh, end))
1435 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1443 * We consider both start and len to be inclusive.
1445 cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1446 clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1450 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1458 * Hole or existing extent len can be arbitrary, so
1459 * cap it to our own allocation request.
1461 if (alloc_size > clusters)
1462 alloc_size = clusters;
1466 * We already have an allocation at this
1467 * region so we can safely skip it.
1472 ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1481 clusters -= alloc_size;
1492 * Truncate a byte range, avoiding pages within partial clusters. This
1493 * preserves those pages for the zeroing code to write to.
1495 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1498 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1500 struct address_space *mapping = inode->i_mapping;
1502 start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1503 end = byte_start + byte_len;
1504 end = end & ~(osb->s_clustersize - 1);
1507 unmap_mapping_range(mapping, start, end - start, 0);
1508 truncate_inode_pages_range(mapping, start, end - 1);
1512 static int ocfs2_zero_partial_clusters(struct inode *inode,
1516 u64 tmpend, end = start + len;
1517 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1518 unsigned int csize = osb->s_clustersize;
1522 * The "start" and "end" values are NOT necessarily part of
1523 * the range whose allocation is being deleted. Rather, this
1524 * is what the user passed in with the request. We must zero
1525 * partial clusters here. There's no need to worry about
1526 * physical allocation - the zeroing code knows to skip holes.
1528 mlog(0, "byte start: %llu, end: %llu\n",
1529 (unsigned long long)start, (unsigned long long)end);
1532 * If both edges are on a cluster boundary then there's no
1533 * zeroing required as the region is part of the allocation to
1536 if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1539 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1540 if (IS_ERR(handle)) {
1541 ret = PTR_ERR(handle);
1547 * We want to get the byte offset of the end of the 1st cluster.
1549 tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1553 mlog(0, "1st range: start: %llu, tmpend: %llu\n",
1554 (unsigned long long)start, (unsigned long long)tmpend);
1556 ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1562 * This may make start and end equal, but the zeroing
1563 * code will skip any work in that case so there's no
1564 * need to catch it up here.
1566 start = end & ~(osb->s_clustersize - 1);
1568 mlog(0, "2nd range: start: %llu, end: %llu\n",
1569 (unsigned long long)start, (unsigned long long)end);
1571 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1576 ocfs2_commit_trans(osb, handle);
1581 static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1584 struct ocfs2_extent_rec *rec = NULL;
1586 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1588 rec = &el->l_recs[i];
1590 if (le32_to_cpu(rec->e_cpos) < pos)
1598 * Helper to calculate the punching pos and length in one run, we handle the
1599 * following three cases in order:
1601 * - remove the entire record
1602 * - remove a partial record
1603 * - no record needs to be removed (hole-punching completed)
1605 static void ocfs2_calc_trunc_pos(struct inode *inode,
1606 struct ocfs2_extent_list *el,
1607 struct ocfs2_extent_rec *rec,
1608 u32 trunc_start, u32 *trunc_cpos,
1609 u32 *trunc_len, u32 *trunc_end,
1610 u64 *blkno, int *done)
1615 range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1617 if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1618 *trunc_cpos = le32_to_cpu(rec->e_cpos);
1620 * Skip holes if any.
1622 if (range < *trunc_end)
1624 *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1625 *blkno = le64_to_cpu(rec->e_blkno);
1626 *trunc_end = le32_to_cpu(rec->e_cpos);
1627 } else if (range > trunc_start) {
1628 *trunc_cpos = trunc_start;
1629 *trunc_len = *trunc_end - trunc_start;
1630 coff = trunc_start - le32_to_cpu(rec->e_cpos);
1631 *blkno = le64_to_cpu(rec->e_blkno) +
1632 ocfs2_clusters_to_blocks(inode->i_sb, coff);
1633 *trunc_end = trunc_start;
1636 * It may have two following possibilities:
1638 * - last record has been removed
1639 * - trunc_start was within a hole
1641 * both two cases mean the completion of hole punching.
1649 static int ocfs2_remove_inode_range(struct inode *inode,
1650 struct buffer_head *di_bh, u64 byte_start,
1653 int ret = 0, flags = 0, done = 0, i;
1654 u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1656 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1657 struct ocfs2_cached_dealloc_ctxt dealloc;
1658 struct address_space *mapping = inode->i_mapping;
1659 struct ocfs2_extent_tree et;
1660 struct ocfs2_path *path = NULL;
1661 struct ocfs2_extent_list *el = NULL;
1662 struct ocfs2_extent_rec *rec = NULL;
1663 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1664 u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1666 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1667 ocfs2_init_dealloc_ctxt(&dealloc);
1672 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1673 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1674 byte_start + byte_len, 0);
1680 * There's no need to get fancy with the page cache
1681 * truncate of an inline-data inode. We're talking
1682 * about less than a page here, which will be cached
1683 * in the dinode buffer anyway.
1685 unmap_mapping_range(mapping, 0, 0, 0);
1686 truncate_inode_pages(mapping, 0);
1691 * For reflinks, we may need to CoW 2 clusters which might be
1692 * partially zero'd later, if hole's start and end offset were
1693 * within one cluster(means is not exactly aligned to clustersize).
1696 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
1698 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1704 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1711 trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1712 trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1713 cluster_in_el = trunc_end;
1715 mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, cend: %u\n",
1716 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1717 (unsigned long long)byte_start,
1718 (unsigned long long)byte_len, trunc_start, trunc_end);
1720 ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1726 path = ocfs2_new_path_from_et(&et);
1733 while (trunc_end > trunc_start) {
1735 ret = ocfs2_find_path(INODE_CACHE(inode), path,
1742 el = path_leaf_el(path);
1744 i = ocfs2_find_rec(el, trunc_end);
1746 * Need to go to previous extent block.
1749 if (path->p_tree_depth == 0)
1752 ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1761 * We've reached the leftmost extent block,
1762 * it's safe to leave.
1764 if (cluster_in_el == 0)
1768 * The 'pos' searched for previous extent block is
1769 * always one cluster less than actual trunc_end.
1771 trunc_end = cluster_in_el + 1;
1773 ocfs2_reinit_path(path, 1);
1778 rec = &el->l_recs[i];
1780 ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1781 &trunc_len, &trunc_end, &blkno, &done);
1785 flags = rec->e_flags;
1786 phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1788 ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1789 phys_cpos, trunc_len, flags,
1790 &dealloc, refcount_loc);
1796 cluster_in_el = trunc_end;
1798 ocfs2_reinit_path(path, 1);
1801 ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1804 ocfs2_schedule_truncate_log_flush(osb, 1);
1805 ocfs2_run_deallocs(osb, &dealloc);
1811 * Parts of this function taken from xfs_change_file_space()
1813 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1814 loff_t f_pos, unsigned int cmd,
1815 struct ocfs2_space_resv *sr,
1821 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1822 struct buffer_head *di_bh = NULL;
1824 unsigned long long max_off = inode->i_sb->s_maxbytes;
1826 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1829 mutex_lock(&inode->i_mutex);
1832 * This prevents concurrent writes on other nodes
1834 ret = ocfs2_rw_lock(inode, 1);
1840 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1846 if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1848 goto out_inode_unlock;
1851 switch (sr->l_whence) {
1852 case 0: /*SEEK_SET*/
1854 case 1: /*SEEK_CUR*/
1855 sr->l_start += f_pos;
1857 case 2: /*SEEK_END*/
1858 sr->l_start += i_size_read(inode);
1862 goto out_inode_unlock;
1866 llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1869 || sr->l_start > max_off
1870 || (sr->l_start + llen) < 0
1871 || (sr->l_start + llen) > max_off) {
1873 goto out_inode_unlock;
1875 size = sr->l_start + sr->l_len;
1877 if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
1878 if (sr->l_len <= 0) {
1880 goto out_inode_unlock;
1884 if (file && should_remove_suid(file->f_path.dentry)) {
1885 ret = __ocfs2_write_remove_suid(inode, di_bh);
1888 goto out_inode_unlock;
1892 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1894 case OCFS2_IOC_RESVSP:
1895 case OCFS2_IOC_RESVSP64:
1897 * This takes unsigned offsets, but the signed ones we
1898 * pass have been checked against overflow above.
1900 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1903 case OCFS2_IOC_UNRESVSP:
1904 case OCFS2_IOC_UNRESVSP64:
1905 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1911 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1914 goto out_inode_unlock;
1918 * We update c/mtime for these changes
1920 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1921 if (IS_ERR(handle)) {
1922 ret = PTR_ERR(handle);
1924 goto out_inode_unlock;
1927 if (change_size && i_size_read(inode) < size)
1928 i_size_write(inode, size);
1930 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1931 ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1935 ocfs2_commit_trans(osb, handle);
1939 ocfs2_inode_unlock(inode, 1);
1941 ocfs2_rw_unlock(inode, 1);
1944 mutex_unlock(&inode->i_mutex);
1948 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1949 struct ocfs2_space_resv *sr)
1951 struct inode *inode = file->f_path.dentry->d_inode;
1952 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1954 if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1955 !ocfs2_writes_unwritten_extents(osb))
1957 else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1958 !ocfs2_sparse_alloc(osb))
1961 if (!S_ISREG(inode->i_mode))
1964 if (!(file->f_mode & FMODE_WRITE))
1967 return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1970 static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
1973 struct inode *inode = file->f_path.dentry->d_inode;
1974 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1975 struct ocfs2_space_resv sr;
1976 int change_size = 1;
1977 int cmd = OCFS2_IOC_RESVSP64;
1979 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1981 if (!ocfs2_writes_unwritten_extents(osb))
1984 if (mode & FALLOC_FL_KEEP_SIZE)
1987 if (mode & FALLOC_FL_PUNCH_HOLE)
1988 cmd = OCFS2_IOC_UNRESVSP64;
1991 sr.l_start = (s64)offset;
1992 sr.l_len = (s64)len;
1994 return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
1998 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2002 unsigned int extent_flags;
2003 u32 cpos, clusters, extent_len, phys_cpos;
2004 struct super_block *sb = inode->i_sb;
2006 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2007 !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
2008 OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2011 cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2012 clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2015 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2022 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2027 if (extent_len > clusters)
2028 extent_len = clusters;
2030 clusters -= extent_len;
2037 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
2039 loff_t pos, size_t count,
2043 struct buffer_head *di_bh = NULL;
2044 u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2046 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2048 ret = ocfs2_inode_lock(inode, &di_bh, 1);
2056 ret = ocfs2_refcount_cow(inode, file, di_bh, cpos, clusters, UINT_MAX);
2064 static int ocfs2_prepare_inode_for_write(struct file *file,
2071 int ret = 0, meta_level = 0;
2072 struct dentry *dentry = file->f_path.dentry;
2073 struct inode *inode = dentry->d_inode;
2074 loff_t saved_pos, end;
2077 * We start with a read level meta lock and only jump to an ex
2078 * if we need to make modifications here.
2081 ret = ocfs2_inode_lock(inode, NULL, meta_level);
2088 /* Clear suid / sgid if necessary. We do this here
2089 * instead of later in the write path because
2090 * remove_suid() calls ->setattr without any hint that
2091 * we may have already done our cluster locking. Since
2092 * ocfs2_setattr() *must* take cluster locks to
2093 * proceeed, this will lead us to recursively lock the
2094 * inode. There's also the dinode i_size state which
2095 * can be lost via setattr during extending writes (we
2096 * set inode->i_size at the end of a write. */
2097 if (should_remove_suid(dentry)) {
2098 if (meta_level == 0) {
2099 ocfs2_inode_unlock(inode, meta_level);
2104 ret = ocfs2_write_remove_suid(inode);
2111 /* work on a copy of ppos until we're sure that we won't have
2112 * to recalculate it due to relocking. */
2114 saved_pos = i_size_read(inode);
2115 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
2120 end = saved_pos + count;
2122 ret = ocfs2_check_range_for_refcount(inode, saved_pos, count);
2124 ocfs2_inode_unlock(inode, meta_level);
2127 ret = ocfs2_prepare_inode_for_refcount(inode,
2144 * Skip the O_DIRECT checks if we don't need
2147 if (!direct_io || !(*direct_io))
2151 * There's no sane way to do direct writes to an inode
2154 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2160 * Allowing concurrent direct writes means
2161 * i_size changes wouldn't be synchronized, so
2162 * one node could wind up truncating another
2165 if (end > i_size_read(inode)) {
2171 * We don't fill holes during direct io, so
2172 * check for them here. If any are found, the
2173 * caller will have to retake some cluster
2174 * locks and initiate the io as buffered.
2176 ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
2189 if (meta_level >= 0)
2190 ocfs2_inode_unlock(inode, meta_level);
2196 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
2197 const struct iovec *iov,
2198 unsigned long nr_segs,
2201 int ret, direct_io, appending, rw_level, have_alloc_sem = 0;
2202 int can_do_direct, has_refcount = 0;
2203 ssize_t written = 0;
2204 size_t ocount; /* original count */
2205 size_t count; /* after file limit checks */
2206 loff_t old_size, *ppos = &iocb->ki_pos;
2208 struct file *file = iocb->ki_filp;
2209 struct inode *inode = file->f_path.dentry->d_inode;
2210 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2211 int full_coherency = !(osb->s_mount_opt &
2212 OCFS2_MOUNT_COHERENCY_BUFFERED);
2214 mlog(0, "(0x%p, %u, '%.*s')\n", file,
2215 (unsigned int)nr_segs,
2216 file->f_path.dentry->d_name.len,
2217 file->f_path.dentry->d_name.name);
2219 if (iocb->ki_left == 0)
2222 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
2224 appending = file->f_flags & O_APPEND ? 1 : 0;
2225 direct_io = file->f_flags & O_DIRECT ? 1 : 0;
2227 mutex_lock(&inode->i_mutex);
2229 ocfs2_iocb_clear_sem_locked(iocb);
2232 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
2234 down_read(&inode->i_alloc_sem);
2236 /* communicate with ocfs2_dio_end_io */
2237 ocfs2_iocb_set_sem_locked(iocb);
2241 * Concurrent O_DIRECT writes are allowed with
2242 * mount_option "coherency=buffered".
2244 rw_level = (!direct_io || full_coherency);
2246 ret = ocfs2_rw_lock(inode, rw_level);
2253 * O_DIRECT writes with "coherency=full" need to take EX cluster
2254 * inode_lock to guarantee coherency.
2256 if (direct_io && full_coherency) {
2258 * We need to take and drop the inode lock to force
2259 * other nodes to drop their caches. Buffered I/O
2260 * already does this in write_begin().
2262 ret = ocfs2_inode_lock(inode, NULL, 1);
2268 ocfs2_inode_unlock(inode, 1);
2271 can_do_direct = direct_io;
2272 ret = ocfs2_prepare_inode_for_write(file, ppos,
2273 iocb->ki_left, appending,
2274 &can_do_direct, &has_refcount);
2281 * We can't complete the direct I/O as requested, fall back to
2284 if (direct_io && !can_do_direct) {
2285 ocfs2_rw_unlock(inode, rw_level);
2286 up_read(&inode->i_alloc_sem);
2296 * To later detect whether a journal commit for sync writes is
2297 * necessary, we sample i_size, and cluster count here.
2299 old_size = i_size_read(inode);
2300 old_clusters = OCFS2_I(inode)->ip_clusters;
2302 /* communicate with ocfs2_dio_end_io */
2303 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2305 ret = generic_segment_checks(iov, &nr_segs, &ocount,
2311 ret = generic_write_checks(file, ppos, &count,
2312 S_ISBLK(inode->i_mode));
2317 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
2318 ppos, count, ocount);
2324 current->backing_dev_info = file->f_mapping->backing_dev_info;
2325 written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos,
2327 current->backing_dev_info = NULL;
2331 /* buffered aio wouldn't have proper lock coverage today */
2332 BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2334 if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
2335 ((file->f_flags & O_DIRECT) && !direct_io)) {
2336 ret = filemap_fdatawrite_range(file->f_mapping, pos,
2341 if (!ret && ((old_size != i_size_read(inode)) ||
2342 (old_clusters != OCFS2_I(inode)->ip_clusters) ||
2344 ret = jbd2_journal_force_commit(osb->journal->j_journal);
2350 ret = filemap_fdatawait_range(file->f_mapping, pos,
2355 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2356 * function pointer which is called when o_direct io completes so that
2357 * it can unlock our rw lock. (it's the clustered equivalent of
2358 * i_alloc_sem; protects truncate from racing with pending ios).
2359 * Unfortunately there are error cases which call end_io and others
2360 * that don't. so we don't have to unlock the rw_lock if either an
2361 * async dio is going to do it in the future or an end_io after an
2362 * error has already done it.
2364 if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2371 ocfs2_rw_unlock(inode, rw_level);
2374 if (have_alloc_sem) {
2375 up_read(&inode->i_alloc_sem);
2376 ocfs2_iocb_clear_sem_locked(iocb);
2379 mutex_unlock(&inode->i_mutex);
2386 static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
2388 struct splice_desc *sd)
2392 ret = ocfs2_prepare_inode_for_write(out, &sd->pos,
2393 sd->total_len, 0, NULL, NULL);
2399 return splice_from_pipe_feed(pipe, sd, pipe_to_file);
2402 static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2409 struct address_space *mapping = out->f_mapping;
2410 struct inode *inode = mapping->host;
2411 struct splice_desc sd = {
2418 mlog(0, "(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
2420 out->f_path.dentry->d_name.len,
2421 out->f_path.dentry->d_name.name);
2424 mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT);
2426 splice_from_pipe_begin(&sd);
2428 ret = splice_from_pipe_next(pipe, &sd);
2432 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2433 ret = ocfs2_rw_lock(inode, 1);
2437 ret = ocfs2_splice_to_file(pipe, out, &sd);
2438 ocfs2_rw_unlock(inode, 1);
2440 mutex_unlock(&inode->i_mutex);
2442 splice_from_pipe_end(pipe, &sd);
2445 mutex_unlock(&pipe->inode->i_mutex);
2448 ret = sd.num_spliced;
2451 unsigned long nr_pages;
2454 nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
2456 err = generic_write_sync(out, *ppos, ret);
2462 balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
2468 static ssize_t ocfs2_file_splice_read(struct file *in,
2470 struct pipe_inode_info *pipe,
2474 int ret = 0, lock_level = 0;
2475 struct inode *inode = in->f_path.dentry->d_inode;
2477 mlog(0, "(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
2479 in->f_path.dentry->d_name.len,
2480 in->f_path.dentry->d_name.name);
2483 * See the comment in ocfs2_file_aio_read()
2485 ret = ocfs2_inode_lock_atime(inode, in->f_vfsmnt, &lock_level);
2490 ocfs2_inode_unlock(inode, lock_level);
2492 ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2498 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2499 const struct iovec *iov,
2500 unsigned long nr_segs,
2503 int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2504 struct file *filp = iocb->ki_filp;
2505 struct inode *inode = filp->f_path.dentry->d_inode;
2507 mlog(0, "(0x%p, %u, '%.*s')\n", filp,
2508 (unsigned int)nr_segs,
2509 filp->f_path.dentry->d_name.len,
2510 filp->f_path.dentry->d_name.name);
2518 ocfs2_iocb_clear_sem_locked(iocb);
2521 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
2522 * need locks to protect pending reads from racing with truncate.
2524 if (filp->f_flags & O_DIRECT) {
2525 down_read(&inode->i_alloc_sem);
2527 ocfs2_iocb_set_sem_locked(iocb);
2529 ret = ocfs2_rw_lock(inode, 0);
2535 /* communicate with ocfs2_dio_end_io */
2536 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2540 * We're fine letting folks race truncates and extending
2541 * writes with read across the cluster, just like they can
2542 * locally. Hence no rw_lock during read.
2544 * Take and drop the meta data lock to update inode fields
2545 * like i_size. This allows the checks down below
2546 * generic_file_aio_read() a chance of actually working.
2548 ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2553 ocfs2_inode_unlock(inode, lock_level);
2555 ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2557 mlog(0, "generic_file_aio_read returned -EINVAL\n");
2559 /* buffered aio wouldn't have proper lock coverage today */
2560 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2562 /* see ocfs2_file_aio_write */
2563 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2569 if (have_alloc_sem) {
2570 up_read(&inode->i_alloc_sem);
2571 ocfs2_iocb_clear_sem_locked(iocb);
2574 ocfs2_rw_unlock(inode, rw_level);
2579 const struct inode_operations ocfs2_file_iops = {
2580 .setattr = ocfs2_setattr,
2581 .getattr = ocfs2_getattr,
2582 .permission = ocfs2_permission,
2583 .setxattr = generic_setxattr,
2584 .getxattr = generic_getxattr,
2585 .listxattr = ocfs2_listxattr,
2586 .removexattr = generic_removexattr,
2587 .fiemap = ocfs2_fiemap,
2590 const struct inode_operations ocfs2_special_file_iops = {
2591 .setattr = ocfs2_setattr,
2592 .getattr = ocfs2_getattr,
2593 .permission = ocfs2_permission,
2597 * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2598 * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2600 const struct file_operations ocfs2_fops = {
2601 .llseek = generic_file_llseek,
2602 .read = do_sync_read,
2603 .write = do_sync_write,
2605 .fsync = ocfs2_sync_file,
2606 .release = ocfs2_file_release,
2607 .open = ocfs2_file_open,
2608 .aio_read = ocfs2_file_aio_read,
2609 .aio_write = ocfs2_file_aio_write,
2610 .unlocked_ioctl = ocfs2_ioctl,
2611 #ifdef CONFIG_COMPAT
2612 .compat_ioctl = ocfs2_compat_ioctl,
2615 .flock = ocfs2_flock,
2616 .splice_read = ocfs2_file_splice_read,
2617 .splice_write = ocfs2_file_splice_write,
2618 .fallocate = ocfs2_fallocate,
2621 const struct file_operations ocfs2_dops = {
2622 .llseek = generic_file_llseek,
2623 .read = generic_read_dir,
2624 .readdir = ocfs2_readdir,
2625 .fsync = ocfs2_sync_file,
2626 .release = ocfs2_dir_release,
2627 .open = ocfs2_dir_open,
2628 .unlocked_ioctl = ocfs2_ioctl,
2629 #ifdef CONFIG_COMPAT
2630 .compat_ioctl = ocfs2_compat_ioctl,
2633 .flock = ocfs2_flock,
2637 * POSIX-lockless variants of our file_operations.
2639 * These will be used if the underlying cluster stack does not support
2640 * posix file locking, if the user passes the "localflocks" mount
2641 * option, or if we have a local-only fs.
2643 * ocfs2_flock is in here because all stacks handle UNIX file locks,
2644 * so we still want it in the case of no stack support for
2645 * plocks. Internally, it will do the right thing when asked to ignore
2648 const struct file_operations ocfs2_fops_no_plocks = {
2649 .llseek = generic_file_llseek,
2650 .read = do_sync_read,
2651 .write = do_sync_write,
2653 .fsync = ocfs2_sync_file,
2654 .release = ocfs2_file_release,
2655 .open = ocfs2_file_open,
2656 .aio_read = ocfs2_file_aio_read,
2657 .aio_write = ocfs2_file_aio_write,
2658 .unlocked_ioctl = ocfs2_ioctl,
2659 #ifdef CONFIG_COMPAT
2660 .compat_ioctl = ocfs2_compat_ioctl,
2662 .flock = ocfs2_flock,
2663 .splice_read = ocfs2_file_splice_read,
2664 .splice_write = ocfs2_file_splice_write,
2667 const struct file_operations ocfs2_dops_no_plocks = {
2668 .llseek = generic_file_llseek,
2669 .read = generic_read_dir,
2670 .readdir = ocfs2_readdir,
2671 .fsync = ocfs2_sync_file,
2672 .release = ocfs2_dir_release,
2673 .open = ocfs2_dir_open,
2674 .unlocked_ioctl = ocfs2_ioctl,
2675 #ifdef CONFIG_COMPAT
2676 .compat_ioctl = ocfs2_compat_ioctl,
2678 .flock = ocfs2_flock,