1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
4 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public
17 * License along with this program; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 021110-1307, USA.
23 #include <linux/slab.h>
24 #include <linux/highmem.h>
25 #include <linux/pagemap.h>
26 #include <asm/byteorder.h>
27 #include <linux/swap.h>
28 #include <linux/pipe_fs_i.h>
29 #include <linux/mpage.h>
31 #define MLOG_MASK_PREFIX ML_FILE_IO
32 #include <cluster/masklog.h>
39 #include "extent_map.h"
47 #include "buffer_head_io.h"
49 static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock,
50 struct buffer_head *bh_result, int create)
54 struct ocfs2_dinode *fe = NULL;
55 struct buffer_head *bh = NULL;
56 struct buffer_head *buffer_cache_bh = NULL;
57 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
60 mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode,
61 (unsigned long long)iblock, bh_result, create);
63 BUG_ON(ocfs2_inode_is_fast_symlink(inode));
65 if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) {
66 mlog(ML_ERROR, "block offset > PATH_MAX: %llu",
67 (unsigned long long)iblock);
71 status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
72 OCFS2_I(inode)->ip_blkno,
73 &bh, OCFS2_BH_CACHED, inode);
78 fe = (struct ocfs2_dinode *) bh->b_data;
80 if (!OCFS2_IS_VALID_DINODE(fe)) {
81 mlog(ML_ERROR, "Invalid dinode #%llu: signature = %.*s\n",
82 (unsigned long long)le64_to_cpu(fe->i_blkno), 7,
87 if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
88 le32_to_cpu(fe->i_clusters))) {
89 mlog(ML_ERROR, "block offset is outside the allocated size: "
90 "%llu\n", (unsigned long long)iblock);
94 /* We don't use the page cache to create symlink data, so if
95 * need be, copy it over from the buffer cache. */
96 if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) {
97 u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) +
99 buffer_cache_bh = sb_getblk(osb->sb, blkno);
100 if (!buffer_cache_bh) {
101 mlog(ML_ERROR, "couldn't getblock for symlink!\n");
105 /* we haven't locked out transactions, so a commit
106 * could've happened. Since we've got a reference on
107 * the bh, even if it commits while we're doing the
108 * copy, the data is still good. */
109 if (buffer_jbd(buffer_cache_bh)
110 && ocfs2_inode_is_new(inode)) {
111 kaddr = kmap_atomic(bh_result->b_page, KM_USER0);
113 mlog(ML_ERROR, "couldn't kmap!\n");
116 memcpy(kaddr + (bh_result->b_size * iblock),
117 buffer_cache_bh->b_data,
119 kunmap_atomic(kaddr, KM_USER0);
120 set_buffer_uptodate(bh_result);
122 brelse(buffer_cache_bh);
125 map_bh(bh_result, inode->i_sb,
126 le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock);
138 static int ocfs2_get_block(struct inode *inode, sector_t iblock,
139 struct buffer_head *bh_result, int create)
142 unsigned int ext_flags;
143 u64 max_blocks = bh_result->b_size >> inode->i_blkbits;
144 u64 p_blkno, count, past_eof;
145 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
147 mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode,
148 (unsigned long long)iblock, bh_result, create);
150 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
151 mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n",
152 inode, inode->i_ino);
154 if (S_ISLNK(inode->i_mode)) {
155 /* this always does I/O for some reason. */
156 err = ocfs2_symlink_get_block(inode, iblock, bh_result, create);
160 err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count,
163 mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, "
164 "%llu, NULL)\n", err, inode, (unsigned long long)iblock,
165 (unsigned long long)p_blkno);
169 if (max_blocks < count)
173 * ocfs2 never allocates in this function - the only time we
174 * need to use BH_New is when we're extending i_size on a file
175 * system which doesn't support holes, in which case BH_New
176 * allows block_prepare_write() to zero.
178 * If we see this on a sparse file system, then a truncate has
179 * raced us and removed the cluster. In this case, we clear
180 * the buffers dirty and uptodate bits and let the buffer code
181 * ignore it as a hole.
183 if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) {
184 clear_buffer_dirty(bh_result);
185 clear_buffer_uptodate(bh_result);
189 /* Treat the unwritten extent as a hole for zeroing purposes. */
190 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
191 map_bh(bh_result, inode->i_sb, p_blkno);
193 bh_result->b_size = count << inode->i_blkbits;
195 if (!ocfs2_sparse_alloc(osb)) {
199 "iblock = %llu p_blkno = %llu blkno=(%llu)\n",
200 (unsigned long long)iblock,
201 (unsigned long long)p_blkno,
202 (unsigned long long)OCFS2_I(inode)->ip_blkno);
203 mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters);
207 past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
208 mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino,
209 (unsigned long long)past_eof);
211 if (create && (iblock >= past_eof))
212 set_buffer_new(bh_result);
223 int ocfs2_read_inline_data(struct inode *inode, struct page *page,
224 struct buffer_head *di_bh)
228 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
230 if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) {
231 ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag",
232 (unsigned long long)OCFS2_I(inode)->ip_blkno);
236 size = i_size_read(inode);
238 if (size > PAGE_CACHE_SIZE ||
239 size > ocfs2_max_inline_data(inode->i_sb)) {
240 ocfs2_error(inode->i_sb,
241 "Inode %llu has with inline data has bad size: %Lu",
242 (unsigned long long)OCFS2_I(inode)->ip_blkno,
243 (unsigned long long)size);
247 kaddr = kmap_atomic(page, KM_USER0);
249 memcpy(kaddr, di->id2.i_data.id_data, size);
250 /* Clear the remaining part of the page */
251 memset(kaddr + size, 0, PAGE_CACHE_SIZE - size);
252 flush_dcache_page(page);
253 kunmap_atomic(kaddr, KM_USER0);
255 SetPageUptodate(page);
260 static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
263 struct buffer_head *di_bh = NULL;
264 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
266 BUG_ON(!PageLocked(page));
267 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
269 ret = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &di_bh,
270 OCFS2_BH_CACHED, inode);
276 ret = ocfs2_read_inline_data(inode, page, di_bh);
284 static int ocfs2_readpage(struct file *file, struct page *page)
286 struct inode *inode = page->mapping->host;
287 struct ocfs2_inode_info *oi = OCFS2_I(inode);
288 loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT;
291 mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0));
293 ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page);
295 if (ret == AOP_TRUNCATED_PAGE)
301 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
302 ret = AOP_TRUNCATED_PAGE;
303 goto out_inode_unlock;
307 * i_size might have just been updated as we grabed the meta lock. We
308 * might now be discovering a truncate that hit on another node.
309 * block_read_full_page->get_block freaks out if it is asked to read
310 * beyond the end of a file, so we check here. Callers
311 * (generic_file_read, vm_ops->fault) are clever enough to check i_size
312 * and notice that the page they just read isn't needed.
314 * XXX sys_readahead() seems to get that wrong?
316 if (start >= i_size_read(inode)) {
317 zero_user(page, 0, PAGE_SIZE);
318 SetPageUptodate(page);
323 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
324 ret = ocfs2_readpage_inline(inode, page);
326 ret = block_read_full_page(page, ocfs2_get_block);
330 up_read(&OCFS2_I(inode)->ip_alloc_sem);
332 ocfs2_inode_unlock(inode, 0);
341 * This is used only for read-ahead. Failures or difficult to handle
342 * situations are safe to ignore.
344 * Right now, we don't bother with BH_Boundary - in-inode extent lists
345 * are quite large (243 extents on 4k blocks), so most inodes don't
346 * grow out to a tree. If need be, detecting boundary extents could
347 * trivially be added in a future version of ocfs2_get_block().
349 static int ocfs2_readpages(struct file *filp, struct address_space *mapping,
350 struct list_head *pages, unsigned nr_pages)
353 struct inode *inode = mapping->host;
354 struct ocfs2_inode_info *oi = OCFS2_I(inode);
359 * Use the nonblocking flag for the dlm code to avoid page
360 * lock inversion, but don't bother with retrying.
362 ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK);
366 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
367 ocfs2_inode_unlock(inode, 0);
372 * Don't bother with inline-data. There isn't anything
373 * to read-ahead in that case anyway...
375 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
379 * Check whether a remote node truncated this file - we just
380 * drop out in that case as it's not worth handling here.
382 last = list_entry(pages->prev, struct page, lru);
383 start = (loff_t)last->index << PAGE_CACHE_SHIFT;
384 if (start >= i_size_read(inode))
387 err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block);
390 up_read(&oi->ip_alloc_sem);
391 ocfs2_inode_unlock(inode, 0);
396 /* Note: Because we don't support holes, our allocation has
397 * already happened (allocation writes zeros to the file data)
398 * so we don't have to worry about ordered writes in
401 * ->writepage is called during the process of invalidating the page cache
402 * during blocked lock processing. It can't block on any cluster locks
403 * to during block mapping. It's relying on the fact that the block
404 * mapping can't have disappeared under the dirty pages that it is
405 * being asked to write back.
407 static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
411 mlog_entry("(0x%p)\n", page);
413 ret = block_write_full_page(page, ocfs2_get_block, wbc);
421 * This is called from ocfs2_write_zero_page() which has handled it's
422 * own cluster locking and has ensured allocation exists for those
423 * blocks to be written.
425 int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page,
426 unsigned from, unsigned to)
430 ret = block_prepare_write(page, from, to, ocfs2_get_block);
435 /* Taken from ext3. We don't necessarily need the full blown
436 * functionality yet, but IMHO it's better to cut and paste the whole
437 * thing so we can avoid introducing our own bugs (and easily pick up
438 * their fixes when they happen) --Mark */
439 int walk_page_buffers( handle_t *handle,
440 struct buffer_head *head,
444 int (*fn)( handle_t *handle,
445 struct buffer_head *bh))
447 struct buffer_head *bh;
448 unsigned block_start, block_end;
449 unsigned blocksize = head->b_size;
451 struct buffer_head *next;
453 for ( bh = head, block_start = 0;
454 ret == 0 && (bh != head || !block_start);
455 block_start = block_end, bh = next)
457 next = bh->b_this_page;
458 block_end = block_start + blocksize;
459 if (block_end <= from || block_start >= to) {
460 if (partial && !buffer_uptodate(bh))
464 err = (*fn)(handle, bh);
471 handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
476 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
480 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
481 if (IS_ERR(handle)) {
487 if (ocfs2_should_order_data(inode)) {
488 ret = walk_page_buffers(handle,
491 ocfs2_journal_dirty_data);
498 ocfs2_commit_trans(osb, handle);
499 handle = ERR_PTR(ret);
504 static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
509 struct inode *inode = mapping->host;
511 mlog_entry("(block = %llu)\n", (unsigned long long)block);
513 /* We don't need to lock journal system files, since they aren't
514 * accessed concurrently from multiple nodes.
516 if (!INODE_JOURNAL(inode)) {
517 err = ocfs2_inode_lock(inode, NULL, 0);
523 down_read(&OCFS2_I(inode)->ip_alloc_sem);
526 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
527 err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
530 if (!INODE_JOURNAL(inode)) {
531 up_read(&OCFS2_I(inode)->ip_alloc_sem);
532 ocfs2_inode_unlock(inode, 0);
536 mlog(ML_ERROR, "get_blocks() failed, block = %llu\n",
537 (unsigned long long)block);
543 status = err ? 0 : p_blkno;
545 mlog_exit((int)status);
551 * TODO: Make this into a generic get_blocks function.
553 * From do_direct_io in direct-io.c:
554 * "So what we do is to permit the ->get_blocks function to populate
555 * bh.b_size with the size of IO which is permitted at this offset and
558 * This function is called directly from get_more_blocks in direct-io.c.
560 * called like this: dio->get_blocks(dio->inode, fs_startblk,
561 * fs_count, map_bh, dio->rw == WRITE);
563 static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
564 struct buffer_head *bh_result, int create)
567 u64 p_blkno, inode_blocks, contig_blocks;
568 unsigned int ext_flags;
569 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
570 unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
572 /* This function won't even be called if the request isn't all
573 * nicely aligned and of the right size, so there's no need
574 * for us to check any of that. */
576 inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
579 * Any write past EOF is not allowed because we'd be extending.
581 if (create && (iblock + max_blocks) > inode_blocks) {
586 /* This figures out the size of the next contiguous block, and
587 * our logical offset */
588 ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno,
589 &contig_blocks, &ext_flags);
591 mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
592 (unsigned long long)iblock);
597 if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)) && !p_blkno && create) {
598 ocfs2_error(inode->i_sb,
599 "Inode %llu has a hole at block %llu\n",
600 (unsigned long long)OCFS2_I(inode)->ip_blkno,
601 (unsigned long long)iblock);
607 * get_more_blocks() expects us to describe a hole by clearing
608 * the mapped bit on bh_result().
610 * Consider an unwritten extent as a hole.
612 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
613 map_bh(bh_result, inode->i_sb, p_blkno);
616 * ocfs2_prepare_inode_for_write() should have caught
617 * the case where we'd be filling a hole and triggered
618 * a buffered write instead.
626 clear_buffer_mapped(bh_result);
629 /* make sure we don't map more than max_blocks blocks here as
630 that's all the kernel will handle at this point. */
631 if (max_blocks < contig_blocks)
632 contig_blocks = max_blocks;
633 bh_result->b_size = contig_blocks << blocksize_bits;
639 * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're
640 * particularly interested in the aio/dio case. Like the core uses
641 * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from
642 * truncation on another.
644 static void ocfs2_dio_end_io(struct kiocb *iocb,
649 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
652 /* this io's submitter should not have unlocked this before we could */
653 BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
655 ocfs2_iocb_clear_rw_locked(iocb);
657 level = ocfs2_iocb_rw_locked_level(iocb);
659 up_read(&inode->i_alloc_sem);
660 ocfs2_rw_unlock(inode, level);
664 * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen
665 * from ext3. PageChecked() bits have been removed as OCFS2 does not
666 * do journalled data.
668 static void ocfs2_invalidatepage(struct page *page, unsigned long offset)
670 journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
672 journal_invalidatepage(journal, page, offset);
675 static int ocfs2_releasepage(struct page *page, gfp_t wait)
677 journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
679 if (!page_has_buffers(page))
681 return journal_try_to_free_buffers(journal, page, wait);
684 static ssize_t ocfs2_direct_IO(int rw,
686 const struct iovec *iov,
688 unsigned long nr_segs)
690 struct file *file = iocb->ki_filp;
691 struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
697 * Fallback to buffered I/O if we see an inode without
700 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
703 ret = blockdev_direct_IO_no_locking(rw, iocb, inode,
704 inode->i_sb->s_bdev, iov, offset,
706 ocfs2_direct_IO_get_blocks,
713 static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb,
718 unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE;
720 if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) {
723 cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits);
725 cluster_start = cpos % cpp;
726 cluster_start = cluster_start << osb->s_clustersize_bits;
728 cluster_end = cluster_start + osb->s_clustersize;
731 BUG_ON(cluster_start > PAGE_SIZE);
732 BUG_ON(cluster_end > PAGE_SIZE);
735 *start = cluster_start;
741 * 'from' and 'to' are the region in the page to avoid zeroing.
743 * If pagesize > clustersize, this function will avoid zeroing outside
744 * of the cluster boundary.
746 * from == to == 0 is code for "zero the entire cluster region"
748 static void ocfs2_clear_page_regions(struct page *page,
749 struct ocfs2_super *osb, u32 cpos,
750 unsigned from, unsigned to)
753 unsigned int cluster_start, cluster_end;
755 ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end);
757 kaddr = kmap_atomic(page, KM_USER0);
760 if (from > cluster_start)
761 memset(kaddr + cluster_start, 0, from - cluster_start);
762 if (to < cluster_end)
763 memset(kaddr + to, 0, cluster_end - to);
765 memset(kaddr + cluster_start, 0, cluster_end - cluster_start);
768 kunmap_atomic(kaddr, KM_USER0);
772 * Nonsparse file systems fully allocate before we get to the write
773 * code. This prevents ocfs2_write() from tagging the write as an
774 * allocating one, which means ocfs2_map_page_blocks() might try to
775 * read-in the blocks at the tail of our file. Avoid reading them by
776 * testing i_size against each block offset.
778 static int ocfs2_should_read_blk(struct inode *inode, struct page *page,
779 unsigned int block_start)
781 u64 offset = page_offset(page) + block_start;
783 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
786 if (i_size_read(inode) > offset)
793 * Some of this taken from block_prepare_write(). We already have our
794 * mapping by now though, and the entire write will be allocating or
795 * it won't, so not much need to use BH_New.
797 * This will also skip zeroing, which is handled externally.
799 int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
800 struct inode *inode, unsigned int from,
801 unsigned int to, int new)
804 struct buffer_head *head, *bh, *wait[2], **wait_bh = wait;
805 unsigned int block_end, block_start;
806 unsigned int bsize = 1 << inode->i_blkbits;
808 if (!page_has_buffers(page))
809 create_empty_buffers(page, bsize, 0);
811 head = page_buffers(page);
812 for (bh = head, block_start = 0; bh != head || !block_start;
813 bh = bh->b_this_page, block_start += bsize) {
814 block_end = block_start + bsize;
816 clear_buffer_new(bh);
819 * Ignore blocks outside of our i/o range -
820 * they may belong to unallocated clusters.
822 if (block_start >= to || block_end <= from) {
823 if (PageUptodate(page))
824 set_buffer_uptodate(bh);
829 * For an allocating write with cluster size >= page
830 * size, we always write the entire page.
835 if (!buffer_mapped(bh)) {
836 map_bh(bh, inode->i_sb, *p_blkno);
837 unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
840 if (PageUptodate(page)) {
841 if (!buffer_uptodate(bh))
842 set_buffer_uptodate(bh);
843 } else if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
845 ocfs2_should_read_blk(inode, page, block_start) &&
846 (block_start < from || block_end > to)) {
847 ll_rw_block(READ, 1, &bh);
851 *p_blkno = *p_blkno + 1;
855 * If we issued read requests - let them complete.
857 while(wait_bh > wait) {
858 wait_on_buffer(*--wait_bh);
859 if (!buffer_uptodate(*wait_bh))
863 if (ret == 0 || !new)
867 * If we get -EIO above, zero out any newly allocated blocks
868 * to avoid exposing stale data.
873 block_end = block_start + bsize;
874 if (block_end <= from)
876 if (block_start >= to)
879 zero_user(page, block_start, bh->b_size);
880 set_buffer_uptodate(bh);
881 mark_buffer_dirty(bh);
884 block_start = block_end;
885 bh = bh->b_this_page;
886 } while (bh != head);
891 #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE)
892 #define OCFS2_MAX_CTXT_PAGES 1
894 #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE)
897 #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE)
900 * Describe the state of a single cluster to be written to.
902 struct ocfs2_write_cluster_desc {
906 * Give this a unique field because c_phys eventually gets
910 unsigned c_unwritten;
913 static inline int ocfs2_should_zero_cluster(struct ocfs2_write_cluster_desc *d)
915 return d->c_new || d->c_unwritten;
918 struct ocfs2_write_ctxt {
919 /* Logical cluster position / len of write */
923 struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE];
926 * This is true if page_size > cluster_size.
928 * It triggers a set of special cases during write which might
929 * have to deal with allocating writes to partial pages.
931 unsigned int w_large_pages;
934 * Pages involved in this write.
936 * w_target_page is the page being written to by the user.
938 * w_pages is an array of pages which always contains
939 * w_target_page, and in the case of an allocating write with
940 * page_size < cluster size, it will contain zero'd and mapped
941 * pages adjacent to w_target_page which need to be written
942 * out in so that future reads from that region will get
945 struct page *w_pages[OCFS2_MAX_CTXT_PAGES];
946 unsigned int w_num_pages;
947 struct page *w_target_page;
950 * ocfs2_write_end() uses this to know what the real range to
951 * write in the target should be.
953 unsigned int w_target_from;
954 unsigned int w_target_to;
957 * We could use journal_current_handle() but this is cleaner,
962 struct buffer_head *w_di_bh;
964 struct ocfs2_cached_dealloc_ctxt w_dealloc;
967 void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
971 for(i = 0; i < num_pages; i++) {
973 unlock_page(pages[i]);
974 mark_page_accessed(pages[i]);
975 page_cache_release(pages[i]);
980 static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc)
982 ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages);
988 static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp,
989 struct ocfs2_super *osb, loff_t pos,
990 unsigned len, struct buffer_head *di_bh)
993 struct ocfs2_write_ctxt *wc;
995 wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS);
999 wc->w_cpos = pos >> osb->s_clustersize_bits;
1000 cend = (pos + len - 1) >> osb->s_clustersize_bits;
1001 wc->w_clen = cend - wc->w_cpos + 1;
1003 wc->w_di_bh = di_bh;
1005 if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits))
1006 wc->w_large_pages = 1;
1008 wc->w_large_pages = 0;
1010 ocfs2_init_dealloc_ctxt(&wc->w_dealloc);
1018 * If a page has any new buffers, zero them out here, and mark them uptodate
1019 * and dirty so they'll be written out (in order to prevent uninitialised
1020 * block data from leaking). And clear the new bit.
1022 static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to)
1024 unsigned int block_start, block_end;
1025 struct buffer_head *head, *bh;
1027 BUG_ON(!PageLocked(page));
1028 if (!page_has_buffers(page))
1031 bh = head = page_buffers(page);
1034 block_end = block_start + bh->b_size;
1036 if (buffer_new(bh)) {
1037 if (block_end > from && block_start < to) {
1038 if (!PageUptodate(page)) {
1039 unsigned start, end;
1041 start = max(from, block_start);
1042 end = min(to, block_end);
1044 zero_user_segment(page, start, end);
1045 set_buffer_uptodate(bh);
1048 clear_buffer_new(bh);
1049 mark_buffer_dirty(bh);
1053 block_start = block_end;
1054 bh = bh->b_this_page;
1055 } while (bh != head);
1059 * Only called when we have a failure during allocating write to write
1060 * zero's to the newly allocated region.
1062 static void ocfs2_write_failure(struct inode *inode,
1063 struct ocfs2_write_ctxt *wc,
1064 loff_t user_pos, unsigned user_len)
1067 unsigned from = user_pos & (PAGE_CACHE_SIZE - 1),
1068 to = user_pos + user_len;
1069 struct page *tmppage;
1071 ocfs2_zero_new_buffers(wc->w_target_page, from, to);
1073 for(i = 0; i < wc->w_num_pages; i++) {
1074 tmppage = wc->w_pages[i];
1076 if (page_has_buffers(tmppage)) {
1077 if (ocfs2_should_order_data(inode))
1078 walk_page_buffers(wc->w_handle,
1079 page_buffers(tmppage),
1081 ocfs2_journal_dirty_data);
1083 block_commit_write(tmppage, from, to);
1088 static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno,
1089 struct ocfs2_write_ctxt *wc,
1090 struct page *page, u32 cpos,
1091 loff_t user_pos, unsigned user_len,
1095 unsigned int map_from = 0, map_to = 0;
1096 unsigned int cluster_start, cluster_end;
1097 unsigned int user_data_from = 0, user_data_to = 0;
1099 ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos,
1100 &cluster_start, &cluster_end);
1102 if (page == wc->w_target_page) {
1103 map_from = user_pos & (PAGE_CACHE_SIZE - 1);
1104 map_to = map_from + user_len;
1107 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1108 cluster_start, cluster_end,
1111 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1112 map_from, map_to, new);
1118 user_data_from = map_from;
1119 user_data_to = map_to;
1121 map_from = cluster_start;
1122 map_to = cluster_end;
1126 * If we haven't allocated the new page yet, we
1127 * shouldn't be writing it out without copying user
1128 * data. This is likely a math error from the caller.
1132 map_from = cluster_start;
1133 map_to = cluster_end;
1135 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1136 cluster_start, cluster_end, new);
1144 * Parts of newly allocated pages need to be zero'd.
1146 * Above, we have also rewritten 'to' and 'from' - as far as
1147 * the rest of the function is concerned, the entire cluster
1148 * range inside of a page needs to be written.
1150 * We can skip this if the page is up to date - it's already
1151 * been zero'd from being read in as a hole.
1153 if (new && !PageUptodate(page))
1154 ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb),
1155 cpos, user_data_from, user_data_to);
1157 flush_dcache_page(page);
1164 * This function will only grab one clusters worth of pages.
1166 static int ocfs2_grab_pages_for_write(struct address_space *mapping,
1167 struct ocfs2_write_ctxt *wc,
1168 u32 cpos, loff_t user_pos, int new,
1169 struct page *mmap_page)
1172 unsigned long start, target_index, index;
1173 struct inode *inode = mapping->host;
1175 target_index = user_pos >> PAGE_CACHE_SHIFT;
1178 * Figure out how many pages we'll be manipulating here. For
1179 * non allocating write, we just change the one
1180 * page. Otherwise, we'll need a whole clusters worth.
1183 wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb);
1184 start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos);
1186 wc->w_num_pages = 1;
1187 start = target_index;
1190 for(i = 0; i < wc->w_num_pages; i++) {
1193 if (index == target_index && mmap_page) {
1195 * ocfs2_pagemkwrite() is a little different
1196 * and wants us to directly use the page
1199 lock_page(mmap_page);
1201 if (mmap_page->mapping != mapping) {
1202 unlock_page(mmap_page);
1204 * Sanity check - the locking in
1205 * ocfs2_pagemkwrite() should ensure
1206 * that this code doesn't trigger.
1213 page_cache_get(mmap_page);
1214 wc->w_pages[i] = mmap_page;
1216 wc->w_pages[i] = find_or_create_page(mapping, index,
1218 if (!wc->w_pages[i]) {
1225 if (index == target_index)
1226 wc->w_target_page = wc->w_pages[i];
1233 * Prepare a single cluster for write one cluster into the file.
1235 static int ocfs2_write_cluster(struct address_space *mapping,
1236 u32 phys, unsigned int unwritten,
1237 struct ocfs2_alloc_context *data_ac,
1238 struct ocfs2_alloc_context *meta_ac,
1239 struct ocfs2_write_ctxt *wc, u32 cpos,
1240 loff_t user_pos, unsigned user_len)
1242 int ret, i, new, should_zero = 0;
1243 u64 v_blkno, p_blkno;
1244 struct inode *inode = mapping->host;
1246 new = phys == 0 ? 1 : 0;
1247 if (new || unwritten)
1254 * This is safe to call with the page locks - it won't take
1255 * any additional semaphores or cluster locks.
1258 ret = ocfs2_do_extend_allocation(OCFS2_SB(inode->i_sb), inode,
1259 &tmp_pos, 1, 0, wc->w_di_bh,
1260 wc->w_handle, data_ac,
1263 * This shouldn't happen because we must have already
1264 * calculated the correct meta data allocation required. The
1265 * internal tree allocation code should know how to increase
1266 * transaction credits itself.
1268 * If need be, we could handle -EAGAIN for a
1269 * RESTART_TRANS here.
1271 mlog_bug_on_msg(ret == -EAGAIN,
1272 "Inode %llu: EAGAIN return during allocation.\n",
1273 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1278 } else if (unwritten) {
1279 ret = ocfs2_mark_extent_written(inode, wc->w_di_bh,
1280 wc->w_handle, cpos, 1, phys,
1281 meta_ac, &wc->w_dealloc);
1289 v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos);
1291 v_blkno = user_pos >> inode->i_sb->s_blocksize_bits;
1294 * The only reason this should fail is due to an inability to
1295 * find the extent added.
1297 ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL,
1300 ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, "
1301 "at logical block %llu",
1302 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1303 (unsigned long long)v_blkno);
1307 BUG_ON(p_blkno == 0);
1309 for(i = 0; i < wc->w_num_pages; i++) {
1312 tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc,
1313 wc->w_pages[i], cpos,
1324 * We only have cleanup to do in case of allocating write.
1327 ocfs2_write_failure(inode, wc, user_pos, user_len);
1334 static int ocfs2_write_cluster_by_desc(struct address_space *mapping,
1335 struct ocfs2_alloc_context *data_ac,
1336 struct ocfs2_alloc_context *meta_ac,
1337 struct ocfs2_write_ctxt *wc,
1338 loff_t pos, unsigned len)
1342 unsigned int local_len = len;
1343 struct ocfs2_write_cluster_desc *desc;
1344 struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb);
1346 for (i = 0; i < wc->w_clen; i++) {
1347 desc = &wc->w_desc[i];
1350 * We have to make sure that the total write passed in
1351 * doesn't extend past a single cluster.
1354 cluster_off = pos & (osb->s_clustersize - 1);
1355 if ((cluster_off + local_len) > osb->s_clustersize)
1356 local_len = osb->s_clustersize - cluster_off;
1358 ret = ocfs2_write_cluster(mapping, desc->c_phys,
1359 desc->c_unwritten, data_ac, meta_ac,
1360 wc, desc->c_cpos, pos, local_len);
1376 * ocfs2_write_end() wants to know which parts of the target page it
1377 * should complete the write on. It's easiest to compute them ahead of
1378 * time when a more complete view of the write is available.
1380 static void ocfs2_set_target_boundaries(struct ocfs2_super *osb,
1381 struct ocfs2_write_ctxt *wc,
1382 loff_t pos, unsigned len, int alloc)
1384 struct ocfs2_write_cluster_desc *desc;
1386 wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1);
1387 wc->w_target_to = wc->w_target_from + len;
1393 * Allocating write - we may have different boundaries based
1394 * on page size and cluster size.
1396 * NOTE: We can no longer compute one value from the other as
1397 * the actual write length and user provided length may be
1401 if (wc->w_large_pages) {
1403 * We only care about the 1st and last cluster within
1404 * our range and whether they should be zero'd or not. Either
1405 * value may be extended out to the start/end of a
1406 * newly allocated cluster.
1408 desc = &wc->w_desc[0];
1409 if (ocfs2_should_zero_cluster(desc))
1410 ocfs2_figure_cluster_boundaries(osb,
1415 desc = &wc->w_desc[wc->w_clen - 1];
1416 if (ocfs2_should_zero_cluster(desc))
1417 ocfs2_figure_cluster_boundaries(osb,
1422 wc->w_target_from = 0;
1423 wc->w_target_to = PAGE_CACHE_SIZE;
1428 * Populate each single-cluster write descriptor in the write context
1429 * with information about the i/o to be done.
1431 * Returns the number of clusters that will have to be allocated, as
1432 * well as a worst case estimate of the number of extent records that
1433 * would have to be created during a write to an unwritten region.
1435 static int ocfs2_populate_write_desc(struct inode *inode,
1436 struct ocfs2_write_ctxt *wc,
1437 unsigned int *clusters_to_alloc,
1438 unsigned int *extents_to_split)
1441 struct ocfs2_write_cluster_desc *desc;
1442 unsigned int num_clusters = 0;
1443 unsigned int ext_flags = 0;
1447 *clusters_to_alloc = 0;
1448 *extents_to_split = 0;
1450 for (i = 0; i < wc->w_clen; i++) {
1451 desc = &wc->w_desc[i];
1452 desc->c_cpos = wc->w_cpos + i;
1454 if (num_clusters == 0) {
1456 * Need to look up the next extent record.
1458 ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys,
1459 &num_clusters, &ext_flags);
1466 * Assume worst case - that we're writing in
1467 * the middle of the extent.
1469 * We can assume that the write proceeds from
1470 * left to right, in which case the extent
1471 * insert code is smart enough to coalesce the
1472 * next splits into the previous records created.
1474 if (ext_flags & OCFS2_EXT_UNWRITTEN)
1475 *extents_to_split = *extents_to_split + 2;
1478 * Only increment phys if it doesn't describe
1484 desc->c_phys = phys;
1487 *clusters_to_alloc = *clusters_to_alloc + 1;
1489 if (ext_flags & OCFS2_EXT_UNWRITTEN)
1490 desc->c_unwritten = 1;
1500 static int ocfs2_write_begin_inline(struct address_space *mapping,
1501 struct inode *inode,
1502 struct ocfs2_write_ctxt *wc)
1505 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1508 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1510 page = find_or_create_page(mapping, 0, GFP_NOFS);
1517 * If we don't set w_num_pages then this page won't get unlocked
1518 * and freed on cleanup of the write context.
1520 wc->w_pages[0] = wc->w_target_page = page;
1521 wc->w_num_pages = 1;
1523 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1524 if (IS_ERR(handle)) {
1525 ret = PTR_ERR(handle);
1530 ret = ocfs2_journal_access(handle, inode, wc->w_di_bh,
1531 OCFS2_JOURNAL_ACCESS_WRITE);
1533 ocfs2_commit_trans(osb, handle);
1539 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1540 ocfs2_set_inode_data_inline(inode, di);
1542 if (!PageUptodate(page)) {
1543 ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
1545 ocfs2_commit_trans(osb, handle);
1551 wc->w_handle = handle;
1556 int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
1558 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1560 if (new_size <= le16_to_cpu(di->id2.i_data.id_count))
1565 static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
1566 struct inode *inode, loff_t pos,
1567 unsigned len, struct page *mmap_page,
1568 struct ocfs2_write_ctxt *wc)
1570 int ret, written = 0;
1571 loff_t end = pos + len;
1572 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1574 mlog(0, "Inode %llu, write of %u bytes at off %llu. features: 0x%x\n",
1575 (unsigned long long)oi->ip_blkno, len, (unsigned long long)pos,
1576 oi->ip_dyn_features);
1579 * Handle inodes which already have inline data 1st.
1581 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1582 if (mmap_page == NULL &&
1583 ocfs2_size_fits_inline_data(wc->w_di_bh, end))
1584 goto do_inline_write;
1587 * The write won't fit - we have to give this inode an
1588 * inline extent list now.
1590 ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh);
1597 * Check whether the inode can accept inline data.
1599 if (oi->ip_clusters != 0 || i_size_read(inode) != 0)
1603 * Check whether the write can fit.
1605 if (mmap_page || end > ocfs2_max_inline_data(inode->i_sb))
1609 ret = ocfs2_write_begin_inline(mapping, inode, wc);
1616 * This signals to the caller that the data can be written
1621 return written ? written : ret;
1625 * This function only does anything for file systems which can't
1626 * handle sparse files.
1628 * What we want to do here is fill in any hole between the current end
1629 * of allocation and the end of our write. That way the rest of the
1630 * write path can treat it as an non-allocating write, which has no
1631 * special case code for sparse/nonsparse files.
1633 static int ocfs2_expand_nonsparse_inode(struct inode *inode, loff_t pos,
1635 struct ocfs2_write_ctxt *wc)
1638 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1639 loff_t newsize = pos + len;
1641 if (ocfs2_sparse_alloc(osb))
1644 if (newsize <= i_size_read(inode))
1647 ret = ocfs2_extend_no_holes(inode, newsize, newsize - len);
1654 int ocfs2_write_begin_nolock(struct address_space *mapping,
1655 loff_t pos, unsigned len, unsigned flags,
1656 struct page **pagep, void **fsdata,
1657 struct buffer_head *di_bh, struct page *mmap_page)
1659 int ret, credits = OCFS2_INODE_UPDATE_CREDITS;
1660 unsigned int clusters_to_alloc, extents_to_split;
1661 struct ocfs2_write_ctxt *wc;
1662 struct inode *inode = mapping->host;
1663 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1664 struct ocfs2_dinode *di;
1665 struct ocfs2_alloc_context *data_ac = NULL;
1666 struct ocfs2_alloc_context *meta_ac = NULL;
1669 ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh);
1675 if (ocfs2_supports_inline_data(osb)) {
1676 ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len,
1688 ret = ocfs2_expand_nonsparse_inode(inode, pos, len, wc);
1694 ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
1701 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1704 * We set w_target_from, w_target_to here so that
1705 * ocfs2_write_end() knows which range in the target page to
1706 * write out. An allocation requires that we write the entire
1709 if (clusters_to_alloc || extents_to_split) {
1711 * XXX: We are stretching the limits of
1712 * ocfs2_lock_allocators(). It greatly over-estimates
1713 * the work to be done.
1715 ret = ocfs2_lock_allocators(inode, wc->w_di_bh,
1716 clusters_to_alloc, extents_to_split,
1717 &data_ac, &meta_ac);
1723 credits = ocfs2_calc_extend_credits(inode->i_sb, di,
1728 ocfs2_set_target_boundaries(osb, wc, pos, len,
1729 clusters_to_alloc + extents_to_split);
1731 handle = ocfs2_start_trans(osb, credits);
1732 if (IS_ERR(handle)) {
1733 ret = PTR_ERR(handle);
1738 wc->w_handle = handle;
1741 * We don't want this to fail in ocfs2_write_end(), so do it
1744 ret = ocfs2_journal_access(handle, inode, wc->w_di_bh,
1745 OCFS2_JOURNAL_ACCESS_WRITE);
1752 * Fill our page array first. That way we've grabbed enough so
1753 * that we can zero and flush if we error after adding the
1756 ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos,
1757 clusters_to_alloc + extents_to_split,
1764 ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos,
1772 ocfs2_free_alloc_context(data_ac);
1774 ocfs2_free_alloc_context(meta_ac);
1777 *pagep = wc->w_target_page;
1781 ocfs2_commit_trans(osb, handle);
1784 ocfs2_free_write_ctxt(wc);
1787 ocfs2_free_alloc_context(data_ac);
1789 ocfs2_free_alloc_context(meta_ac);
1793 static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
1794 loff_t pos, unsigned len, unsigned flags,
1795 struct page **pagep, void **fsdata)
1798 struct buffer_head *di_bh = NULL;
1799 struct inode *inode = mapping->host;
1801 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1808 * Take alloc sem here to prevent concurrent lookups. That way
1809 * the mapping, zeroing and tree manipulation within
1810 * ocfs2_write() will be safe against ->readpage(). This
1811 * should also serve to lock out allocation from a shared
1814 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1816 ret = ocfs2_write_begin_nolock(mapping, pos, len, flags, pagep,
1817 fsdata, di_bh, NULL);
1828 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1831 ocfs2_inode_unlock(inode, 1);
1836 static void ocfs2_write_end_inline(struct inode *inode, loff_t pos,
1837 unsigned len, unsigned *copied,
1838 struct ocfs2_dinode *di,
1839 struct ocfs2_write_ctxt *wc)
1843 if (unlikely(*copied < len)) {
1844 if (!PageUptodate(wc->w_target_page)) {
1850 kaddr = kmap_atomic(wc->w_target_page, KM_USER0);
1851 memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied);
1852 kunmap_atomic(kaddr, KM_USER0);
1854 mlog(0, "Data written to inode at offset %llu. "
1855 "id_count = %u, copied = %u, i_dyn_features = 0x%x\n",
1856 (unsigned long long)pos, *copied,
1857 le16_to_cpu(di->id2.i_data.id_count),
1858 le16_to_cpu(di->i_dyn_features));
1861 int ocfs2_write_end_nolock(struct address_space *mapping,
1862 loff_t pos, unsigned len, unsigned copied,
1863 struct page *page, void *fsdata)
1866 unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1);
1867 struct inode *inode = mapping->host;
1868 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1869 struct ocfs2_write_ctxt *wc = fsdata;
1870 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1871 handle_t *handle = wc->w_handle;
1872 struct page *tmppage;
1874 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1875 ocfs2_write_end_inline(inode, pos, len, &copied, di, wc);
1876 goto out_write_size;
1879 if (unlikely(copied < len)) {
1880 if (!PageUptodate(wc->w_target_page))
1883 ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
1886 flush_dcache_page(wc->w_target_page);
1888 for(i = 0; i < wc->w_num_pages; i++) {
1889 tmppage = wc->w_pages[i];
1891 if (tmppage == wc->w_target_page) {
1892 from = wc->w_target_from;
1893 to = wc->w_target_to;
1895 BUG_ON(from > PAGE_CACHE_SIZE ||
1896 to > PAGE_CACHE_SIZE ||
1900 * Pages adjacent to the target (if any) imply
1901 * a hole-filling write in which case we want
1902 * to flush their entire range.
1905 to = PAGE_CACHE_SIZE;
1908 if (page_has_buffers(tmppage)) {
1909 if (ocfs2_should_order_data(inode))
1910 walk_page_buffers(wc->w_handle,
1911 page_buffers(tmppage),
1913 ocfs2_journal_dirty_data);
1914 block_commit_write(tmppage, from, to);
1920 if (pos > inode->i_size) {
1921 i_size_write(inode, pos);
1922 mark_inode_dirty(inode);
1924 inode->i_blocks = ocfs2_inode_sector_count(inode);
1925 di->i_size = cpu_to_le64((u64)i_size_read(inode));
1926 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1927 di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
1928 di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
1929 ocfs2_journal_dirty(handle, wc->w_di_bh);
1931 ocfs2_commit_trans(osb, handle);
1933 ocfs2_run_deallocs(osb, &wc->w_dealloc);
1935 ocfs2_free_write_ctxt(wc);
1940 static int ocfs2_write_end(struct file *file, struct address_space *mapping,
1941 loff_t pos, unsigned len, unsigned copied,
1942 struct page *page, void *fsdata)
1945 struct inode *inode = mapping->host;
1947 ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata);
1949 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1950 ocfs2_inode_unlock(inode, 1);
1955 const struct address_space_operations ocfs2_aops = {
1956 .readpage = ocfs2_readpage,
1957 .readpages = ocfs2_readpages,
1958 .writepage = ocfs2_writepage,
1959 .write_begin = ocfs2_write_begin,
1960 .write_end = ocfs2_write_end,
1962 .sync_page = block_sync_page,
1963 .direct_IO = ocfs2_direct_IO,
1964 .invalidatepage = ocfs2_invalidatepage,
1965 .releasepage = ocfs2_releasepage,
1966 .migratepage = buffer_migrate_page,