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);
137 static int ocfs2_get_block(struct inode *inode, sector_t iblock,
138 struct buffer_head *bh_result, int create)
141 unsigned int ext_flags;
142 u64 max_blocks = bh_result->b_size >> inode->i_blkbits;
143 u64 p_blkno, count, past_eof;
144 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
146 mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode,
147 (unsigned long long)iblock, bh_result, create);
149 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
150 mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n",
151 inode, inode->i_ino);
153 if (S_ISLNK(inode->i_mode)) {
154 /* this always does I/O for some reason. */
155 err = ocfs2_symlink_get_block(inode, iblock, bh_result, create);
159 err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count,
162 mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, "
163 "%llu, NULL)\n", err, inode, (unsigned long long)iblock,
164 (unsigned long long)p_blkno);
168 if (max_blocks < count)
172 * ocfs2 never allocates in this function - the only time we
173 * need to use BH_New is when we're extending i_size on a file
174 * system which doesn't support holes, in which case BH_New
175 * allows block_prepare_write() to zero.
177 * If we see this on a sparse file system, then a truncate has
178 * raced us and removed the cluster. In this case, we clear
179 * the buffers dirty and uptodate bits and let the buffer code
180 * ignore it as a hole.
182 if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) {
183 clear_buffer_dirty(bh_result);
184 clear_buffer_uptodate(bh_result);
188 /* Treat the unwritten extent as a hole for zeroing purposes. */
189 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
190 map_bh(bh_result, inode->i_sb, p_blkno);
192 bh_result->b_size = count << inode->i_blkbits;
194 if (!ocfs2_sparse_alloc(osb)) {
198 "iblock = %llu p_blkno = %llu blkno=(%llu)\n",
199 (unsigned long long)iblock,
200 (unsigned long long)p_blkno,
201 (unsigned long long)OCFS2_I(inode)->ip_blkno);
202 mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters);
206 past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
207 mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino,
208 (unsigned long long)past_eof);
210 if (create && (iblock >= past_eof))
211 set_buffer_new(bh_result);
222 int ocfs2_read_inline_data(struct inode *inode, struct page *page,
223 struct buffer_head *di_bh)
227 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
229 if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) {
230 ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag",
231 (unsigned long long)OCFS2_I(inode)->ip_blkno);
235 size = i_size_read(inode);
237 if (size > PAGE_CACHE_SIZE ||
238 size > ocfs2_max_inline_data(inode->i_sb)) {
239 ocfs2_error(inode->i_sb,
240 "Inode %llu has with inline data has bad size: %Lu",
241 (unsigned long long)OCFS2_I(inode)->ip_blkno,
242 (unsigned long long)size);
246 kaddr = kmap_atomic(page, KM_USER0);
248 memcpy(kaddr, di->id2.i_data.id_data, size);
249 /* Clear the remaining part of the page */
250 memset(kaddr + size, 0, PAGE_CACHE_SIZE - size);
251 flush_dcache_page(page);
252 kunmap_atomic(kaddr, KM_USER0);
254 SetPageUptodate(page);
259 static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
262 struct buffer_head *di_bh = NULL;
263 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
265 BUG_ON(!PageLocked(page));
266 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
268 ret = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &di_bh,
269 OCFS2_BH_CACHED, inode);
275 ret = ocfs2_read_inline_data(inode, page, di_bh);
283 static int ocfs2_readpage(struct file *file, struct page *page)
285 struct inode *inode = page->mapping->host;
286 struct ocfs2_inode_info *oi = OCFS2_I(inode);
287 loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT;
290 mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0));
292 ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page);
294 if (ret == AOP_TRUNCATED_PAGE)
300 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
301 ret = AOP_TRUNCATED_PAGE;
302 goto out_inode_unlock;
306 * i_size might have just been updated as we grabed the meta lock. We
307 * might now be discovering a truncate that hit on another node.
308 * block_read_full_page->get_block freaks out if it is asked to read
309 * beyond the end of a file, so we check here. Callers
310 * (generic_file_read, vm_ops->fault) are clever enough to check i_size
311 * and notice that the page they just read isn't needed.
313 * XXX sys_readahead() seems to get that wrong?
315 if (start >= i_size_read(inode)) {
316 zero_user(page, 0, PAGE_SIZE);
317 SetPageUptodate(page);
322 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
323 ret = ocfs2_readpage_inline(inode, page);
325 ret = block_read_full_page(page, ocfs2_get_block);
329 up_read(&OCFS2_I(inode)->ip_alloc_sem);
331 ocfs2_inode_unlock(inode, 0);
340 * This is used only for read-ahead. Failures or difficult to handle
341 * situations are safe to ignore.
343 * Right now, we don't bother with BH_Boundary - in-inode extent lists
344 * are quite large (243 extents on 4k blocks), so most inodes don't
345 * grow out to a tree. If need be, detecting boundary extents could
346 * trivially be added in a future version of ocfs2_get_block().
348 static int ocfs2_readpages(struct file *filp, struct address_space *mapping,
349 struct list_head *pages, unsigned nr_pages)
352 struct inode *inode = mapping->host;
353 struct ocfs2_inode_info *oi = OCFS2_I(inode);
358 * Use the nonblocking flag for the dlm code to avoid page
359 * lock inversion, but don't bother with retrying.
361 ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK);
365 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
366 ocfs2_inode_unlock(inode, 0);
371 * Don't bother with inline-data. There isn't anything
372 * to read-ahead in that case anyway...
374 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
378 * Check whether a remote node truncated this file - we just
379 * drop out in that case as it's not worth handling here.
381 last = list_entry(pages->prev, struct page, lru);
382 start = (loff_t)last->index << PAGE_CACHE_SHIFT;
383 if (start >= i_size_read(inode))
386 err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block);
389 up_read(&oi->ip_alloc_sem);
390 ocfs2_inode_unlock(inode, 0);
395 /* Note: Because we don't support holes, our allocation has
396 * already happened (allocation writes zeros to the file data)
397 * so we don't have to worry about ordered writes in
400 * ->writepage is called during the process of invalidating the page cache
401 * during blocked lock processing. It can't block on any cluster locks
402 * to during block mapping. It's relying on the fact that the block
403 * mapping can't have disappeared under the dirty pages that it is
404 * being asked to write back.
406 static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
410 mlog_entry("(0x%p)\n", page);
412 ret = block_write_full_page(page, ocfs2_get_block, wbc);
420 * This is called from ocfs2_write_zero_page() which has handled it's
421 * own cluster locking and has ensured allocation exists for those
422 * blocks to be written.
424 int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page,
425 unsigned from, unsigned to)
429 ret = block_prepare_write(page, from, to, ocfs2_get_block);
434 /* Taken from ext3. We don't necessarily need the full blown
435 * functionality yet, but IMHO it's better to cut and paste the whole
436 * thing so we can avoid introducing our own bugs (and easily pick up
437 * their fixes when they happen) --Mark */
438 int walk_page_buffers( handle_t *handle,
439 struct buffer_head *head,
443 int (*fn)( handle_t *handle,
444 struct buffer_head *bh))
446 struct buffer_head *bh;
447 unsigned block_start, block_end;
448 unsigned blocksize = head->b_size;
450 struct buffer_head *next;
452 for ( bh = head, block_start = 0;
453 ret == 0 && (bh != head || !block_start);
454 block_start = block_end, bh = next)
456 next = bh->b_this_page;
457 block_end = block_start + blocksize;
458 if (block_end <= from || block_start >= to) {
459 if (partial && !buffer_uptodate(bh))
463 err = (*fn)(handle, bh);
470 handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
475 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
479 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
480 if (IS_ERR(handle)) {
486 if (ocfs2_should_order_data(inode)) {
487 ret = ocfs2_jbd2_file_inode(handle, inode);
488 #ifdef CONFIG_OCFS2_COMPAT_JBD
489 ret = walk_page_buffers(handle,
492 ocfs2_journal_dirty_data);
500 ocfs2_commit_trans(osb, handle);
501 handle = ERR_PTR(ret);
506 static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
511 struct inode *inode = mapping->host;
513 mlog_entry("(block = %llu)\n", (unsigned long long)block);
515 /* We don't need to lock journal system files, since they aren't
516 * accessed concurrently from multiple nodes.
518 if (!INODE_JOURNAL(inode)) {
519 err = ocfs2_inode_lock(inode, NULL, 0);
525 down_read(&OCFS2_I(inode)->ip_alloc_sem);
528 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
529 err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
532 if (!INODE_JOURNAL(inode)) {
533 up_read(&OCFS2_I(inode)->ip_alloc_sem);
534 ocfs2_inode_unlock(inode, 0);
538 mlog(ML_ERROR, "get_blocks() failed, block = %llu\n",
539 (unsigned long long)block);
545 status = err ? 0 : p_blkno;
547 mlog_exit((int)status);
553 * TODO: Make this into a generic get_blocks function.
555 * From do_direct_io in direct-io.c:
556 * "So what we do is to permit the ->get_blocks function to populate
557 * bh.b_size with the size of IO which is permitted at this offset and
560 * This function is called directly from get_more_blocks in direct-io.c.
562 * called like this: dio->get_blocks(dio->inode, fs_startblk,
563 * fs_count, map_bh, dio->rw == WRITE);
565 static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
566 struct buffer_head *bh_result, int create)
569 u64 p_blkno, inode_blocks, contig_blocks;
570 unsigned int ext_flags;
571 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
572 unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
574 /* This function won't even be called if the request isn't all
575 * nicely aligned and of the right size, so there's no need
576 * for us to check any of that. */
578 inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
581 * Any write past EOF is not allowed because we'd be extending.
583 if (create && (iblock + max_blocks) > inode_blocks) {
588 /* This figures out the size of the next contiguous block, and
589 * our logical offset */
590 ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno,
591 &contig_blocks, &ext_flags);
593 mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
594 (unsigned long long)iblock);
599 if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)) && !p_blkno && create) {
600 ocfs2_error(inode->i_sb,
601 "Inode %llu has a hole at block %llu\n",
602 (unsigned long long)OCFS2_I(inode)->ip_blkno,
603 (unsigned long long)iblock);
609 * get_more_blocks() expects us to describe a hole by clearing
610 * the mapped bit on bh_result().
612 * Consider an unwritten extent as a hole.
614 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
615 map_bh(bh_result, inode->i_sb, p_blkno);
618 * ocfs2_prepare_inode_for_write() should have caught
619 * the case where we'd be filling a hole and triggered
620 * a buffered write instead.
628 clear_buffer_mapped(bh_result);
631 /* make sure we don't map more than max_blocks blocks here as
632 that's all the kernel will handle at this point. */
633 if (max_blocks < contig_blocks)
634 contig_blocks = max_blocks;
635 bh_result->b_size = contig_blocks << blocksize_bits;
641 * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're
642 * particularly interested in the aio/dio case. Like the core uses
643 * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from
644 * truncation on another.
646 static void ocfs2_dio_end_io(struct kiocb *iocb,
651 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
654 /* this io's submitter should not have unlocked this before we could */
655 BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
657 ocfs2_iocb_clear_rw_locked(iocb);
659 level = ocfs2_iocb_rw_locked_level(iocb);
661 up_read(&inode->i_alloc_sem);
662 ocfs2_rw_unlock(inode, level);
666 * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen
667 * from ext3. PageChecked() bits have been removed as OCFS2 does not
668 * do journalled data.
670 static void ocfs2_invalidatepage(struct page *page, unsigned long offset)
672 journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
674 jbd2_journal_invalidatepage(journal, page, offset);
677 static int ocfs2_releasepage(struct page *page, gfp_t wait)
679 journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
681 if (!page_has_buffers(page))
683 return jbd2_journal_try_to_free_buffers(journal, page, wait);
686 static ssize_t ocfs2_direct_IO(int rw,
688 const struct iovec *iov,
690 unsigned long nr_segs)
692 struct file *file = iocb->ki_filp;
693 struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
699 * Fallback to buffered I/O if we see an inode without
702 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
705 ret = blockdev_direct_IO_no_locking(rw, iocb, inode,
706 inode->i_sb->s_bdev, iov, offset,
708 ocfs2_direct_IO_get_blocks,
715 static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb,
720 unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE;
722 if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) {
725 cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits);
727 cluster_start = cpos % cpp;
728 cluster_start = cluster_start << osb->s_clustersize_bits;
730 cluster_end = cluster_start + osb->s_clustersize;
733 BUG_ON(cluster_start > PAGE_SIZE);
734 BUG_ON(cluster_end > PAGE_SIZE);
737 *start = cluster_start;
743 * 'from' and 'to' are the region in the page to avoid zeroing.
745 * If pagesize > clustersize, this function will avoid zeroing outside
746 * of the cluster boundary.
748 * from == to == 0 is code for "zero the entire cluster region"
750 static void ocfs2_clear_page_regions(struct page *page,
751 struct ocfs2_super *osb, u32 cpos,
752 unsigned from, unsigned to)
755 unsigned int cluster_start, cluster_end;
757 ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end);
759 kaddr = kmap_atomic(page, KM_USER0);
762 if (from > cluster_start)
763 memset(kaddr + cluster_start, 0, from - cluster_start);
764 if (to < cluster_end)
765 memset(kaddr + to, 0, cluster_end - to);
767 memset(kaddr + cluster_start, 0, cluster_end - cluster_start);
770 kunmap_atomic(kaddr, KM_USER0);
774 * Nonsparse file systems fully allocate before we get to the write
775 * code. This prevents ocfs2_write() from tagging the write as an
776 * allocating one, which means ocfs2_map_page_blocks() might try to
777 * read-in the blocks at the tail of our file. Avoid reading them by
778 * testing i_size against each block offset.
780 static int ocfs2_should_read_blk(struct inode *inode, struct page *page,
781 unsigned int block_start)
783 u64 offset = page_offset(page) + block_start;
785 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
788 if (i_size_read(inode) > offset)
795 * Some of this taken from block_prepare_write(). We already have our
796 * mapping by now though, and the entire write will be allocating or
797 * it won't, so not much need to use BH_New.
799 * This will also skip zeroing, which is handled externally.
801 int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
802 struct inode *inode, unsigned int from,
803 unsigned int to, int new)
806 struct buffer_head *head, *bh, *wait[2], **wait_bh = wait;
807 unsigned int block_end, block_start;
808 unsigned int bsize = 1 << inode->i_blkbits;
810 if (!page_has_buffers(page))
811 create_empty_buffers(page, bsize, 0);
813 head = page_buffers(page);
814 for (bh = head, block_start = 0; bh != head || !block_start;
815 bh = bh->b_this_page, block_start += bsize) {
816 block_end = block_start + bsize;
818 clear_buffer_new(bh);
821 * Ignore blocks outside of our i/o range -
822 * they may belong to unallocated clusters.
824 if (block_start >= to || block_end <= from) {
825 if (PageUptodate(page))
826 set_buffer_uptodate(bh);
831 * For an allocating write with cluster size >= page
832 * size, we always write the entire page.
837 if (!buffer_mapped(bh)) {
838 map_bh(bh, inode->i_sb, *p_blkno);
839 unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
842 if (PageUptodate(page)) {
843 if (!buffer_uptodate(bh))
844 set_buffer_uptodate(bh);
845 } else if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
847 ocfs2_should_read_blk(inode, page, block_start) &&
848 (block_start < from || block_end > to)) {
849 ll_rw_block(READ, 1, &bh);
853 *p_blkno = *p_blkno + 1;
857 * If we issued read requests - let them complete.
859 while(wait_bh > wait) {
860 wait_on_buffer(*--wait_bh);
861 if (!buffer_uptodate(*wait_bh))
865 if (ret == 0 || !new)
869 * If we get -EIO above, zero out any newly allocated blocks
870 * to avoid exposing stale data.
875 block_end = block_start + bsize;
876 if (block_end <= from)
878 if (block_start >= to)
881 zero_user(page, block_start, bh->b_size);
882 set_buffer_uptodate(bh);
883 mark_buffer_dirty(bh);
886 block_start = block_end;
887 bh = bh->b_this_page;
888 } while (bh != head);
893 #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE)
894 #define OCFS2_MAX_CTXT_PAGES 1
896 #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE)
899 #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE)
902 * Describe the state of a single cluster to be written to.
904 struct ocfs2_write_cluster_desc {
908 * Give this a unique field because c_phys eventually gets
912 unsigned c_unwritten;
915 static inline int ocfs2_should_zero_cluster(struct ocfs2_write_cluster_desc *d)
917 return d->c_new || d->c_unwritten;
920 struct ocfs2_write_ctxt {
921 /* Logical cluster position / len of write */
925 struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE];
928 * This is true if page_size > cluster_size.
930 * It triggers a set of special cases during write which might
931 * have to deal with allocating writes to partial pages.
933 unsigned int w_large_pages;
936 * Pages involved in this write.
938 * w_target_page is the page being written to by the user.
940 * w_pages is an array of pages which always contains
941 * w_target_page, and in the case of an allocating write with
942 * page_size < cluster size, it will contain zero'd and mapped
943 * pages adjacent to w_target_page which need to be written
944 * out in so that future reads from that region will get
947 struct page *w_pages[OCFS2_MAX_CTXT_PAGES];
948 unsigned int w_num_pages;
949 struct page *w_target_page;
952 * ocfs2_write_end() uses this to know what the real range to
953 * write in the target should be.
955 unsigned int w_target_from;
956 unsigned int w_target_to;
959 * We could use journal_current_handle() but this is cleaner,
964 struct buffer_head *w_di_bh;
966 struct ocfs2_cached_dealloc_ctxt w_dealloc;
969 void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
973 for(i = 0; i < num_pages; i++) {
975 unlock_page(pages[i]);
976 mark_page_accessed(pages[i]);
977 page_cache_release(pages[i]);
982 static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc)
984 ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages);
990 static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp,
991 struct ocfs2_super *osb, loff_t pos,
992 unsigned len, struct buffer_head *di_bh)
995 struct ocfs2_write_ctxt *wc;
997 wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS);
1001 wc->w_cpos = pos >> osb->s_clustersize_bits;
1002 cend = (pos + len - 1) >> osb->s_clustersize_bits;
1003 wc->w_clen = cend - wc->w_cpos + 1;
1005 wc->w_di_bh = di_bh;
1007 if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits))
1008 wc->w_large_pages = 1;
1010 wc->w_large_pages = 0;
1012 ocfs2_init_dealloc_ctxt(&wc->w_dealloc);
1020 * If a page has any new buffers, zero them out here, and mark them uptodate
1021 * and dirty so they'll be written out (in order to prevent uninitialised
1022 * block data from leaking). And clear the new bit.
1024 static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to)
1026 unsigned int block_start, block_end;
1027 struct buffer_head *head, *bh;
1029 BUG_ON(!PageLocked(page));
1030 if (!page_has_buffers(page))
1033 bh = head = page_buffers(page);
1036 block_end = block_start + bh->b_size;
1038 if (buffer_new(bh)) {
1039 if (block_end > from && block_start < to) {
1040 if (!PageUptodate(page)) {
1041 unsigned start, end;
1043 start = max(from, block_start);
1044 end = min(to, block_end);
1046 zero_user_segment(page, start, end);
1047 set_buffer_uptodate(bh);
1050 clear_buffer_new(bh);
1051 mark_buffer_dirty(bh);
1055 block_start = block_end;
1056 bh = bh->b_this_page;
1057 } while (bh != head);
1061 * Only called when we have a failure during allocating write to write
1062 * zero's to the newly allocated region.
1064 static void ocfs2_write_failure(struct inode *inode,
1065 struct ocfs2_write_ctxt *wc,
1066 loff_t user_pos, unsigned user_len)
1069 unsigned from = user_pos & (PAGE_CACHE_SIZE - 1),
1070 to = user_pos + user_len;
1071 struct page *tmppage;
1073 ocfs2_zero_new_buffers(wc->w_target_page, from, to);
1075 for(i = 0; i < wc->w_num_pages; i++) {
1076 tmppage = wc->w_pages[i];
1078 if (page_has_buffers(tmppage)) {
1079 if (ocfs2_should_order_data(inode)) {
1080 ocfs2_jbd2_file_inode(wc->w_handle, inode);
1081 #ifdef CONFIG_OCFS2_COMPAT_JBD
1082 walk_page_buffers(wc->w_handle,
1083 page_buffers(tmppage),
1085 ocfs2_journal_dirty_data);
1089 block_commit_write(tmppage, from, to);
1094 static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno,
1095 struct ocfs2_write_ctxt *wc,
1096 struct page *page, u32 cpos,
1097 loff_t user_pos, unsigned user_len,
1101 unsigned int map_from = 0, map_to = 0;
1102 unsigned int cluster_start, cluster_end;
1103 unsigned int user_data_from = 0, user_data_to = 0;
1105 ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos,
1106 &cluster_start, &cluster_end);
1108 if (page == wc->w_target_page) {
1109 map_from = user_pos & (PAGE_CACHE_SIZE - 1);
1110 map_to = map_from + user_len;
1113 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1114 cluster_start, cluster_end,
1117 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1118 map_from, map_to, new);
1124 user_data_from = map_from;
1125 user_data_to = map_to;
1127 map_from = cluster_start;
1128 map_to = cluster_end;
1132 * If we haven't allocated the new page yet, we
1133 * shouldn't be writing it out without copying user
1134 * data. This is likely a math error from the caller.
1138 map_from = cluster_start;
1139 map_to = cluster_end;
1141 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1142 cluster_start, cluster_end, new);
1150 * Parts of newly allocated pages need to be zero'd.
1152 * Above, we have also rewritten 'to' and 'from' - as far as
1153 * the rest of the function is concerned, the entire cluster
1154 * range inside of a page needs to be written.
1156 * We can skip this if the page is up to date - it's already
1157 * been zero'd from being read in as a hole.
1159 if (new && !PageUptodate(page))
1160 ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb),
1161 cpos, user_data_from, user_data_to);
1163 flush_dcache_page(page);
1170 * This function will only grab one clusters worth of pages.
1172 static int ocfs2_grab_pages_for_write(struct address_space *mapping,
1173 struct ocfs2_write_ctxt *wc,
1174 u32 cpos, loff_t user_pos, int new,
1175 struct page *mmap_page)
1178 unsigned long start, target_index, index;
1179 struct inode *inode = mapping->host;
1181 target_index = user_pos >> PAGE_CACHE_SHIFT;
1184 * Figure out how many pages we'll be manipulating here. For
1185 * non allocating write, we just change the one
1186 * page. Otherwise, we'll need a whole clusters worth.
1189 wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb);
1190 start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos);
1192 wc->w_num_pages = 1;
1193 start = target_index;
1196 for(i = 0; i < wc->w_num_pages; i++) {
1199 if (index == target_index && mmap_page) {
1201 * ocfs2_pagemkwrite() is a little different
1202 * and wants us to directly use the page
1205 lock_page(mmap_page);
1207 if (mmap_page->mapping != mapping) {
1208 unlock_page(mmap_page);
1210 * Sanity check - the locking in
1211 * ocfs2_pagemkwrite() should ensure
1212 * that this code doesn't trigger.
1219 page_cache_get(mmap_page);
1220 wc->w_pages[i] = mmap_page;
1222 wc->w_pages[i] = find_or_create_page(mapping, index,
1224 if (!wc->w_pages[i]) {
1231 if (index == target_index)
1232 wc->w_target_page = wc->w_pages[i];
1239 * Prepare a single cluster for write one cluster into the file.
1241 static int ocfs2_write_cluster(struct address_space *mapping,
1242 u32 phys, unsigned int unwritten,
1243 struct ocfs2_alloc_context *data_ac,
1244 struct ocfs2_alloc_context *meta_ac,
1245 struct ocfs2_write_ctxt *wc, u32 cpos,
1246 loff_t user_pos, unsigned user_len)
1248 int ret, i, new, should_zero = 0;
1249 u64 v_blkno, p_blkno;
1250 struct inode *inode = mapping->host;
1251 struct ocfs2_extent_tree et;
1253 new = phys == 0 ? 1 : 0;
1254 if (new || unwritten)
1261 * This is safe to call with the page locks - it won't take
1262 * any additional semaphores or cluster locks.
1265 ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode,
1266 &tmp_pos, 1, 0, wc->w_di_bh,
1267 wc->w_handle, data_ac,
1270 * This shouldn't happen because we must have already
1271 * calculated the correct meta data allocation required. The
1272 * internal tree allocation code should know how to increase
1273 * transaction credits itself.
1275 * If need be, we could handle -EAGAIN for a
1276 * RESTART_TRANS here.
1278 mlog_bug_on_msg(ret == -EAGAIN,
1279 "Inode %llu: EAGAIN return during allocation.\n",
1280 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1285 } else if (unwritten) {
1286 ocfs2_init_dinode_extent_tree(&et, inode, wc->w_di_bh);
1287 ret = ocfs2_mark_extent_written(inode, &et,
1288 wc->w_handle, cpos, 1, phys,
1289 meta_ac, &wc->w_dealloc);
1297 v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos);
1299 v_blkno = user_pos >> inode->i_sb->s_blocksize_bits;
1302 * The only reason this should fail is due to an inability to
1303 * find the extent added.
1305 ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL,
1308 ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, "
1309 "at logical block %llu",
1310 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1311 (unsigned long long)v_blkno);
1315 BUG_ON(p_blkno == 0);
1317 for(i = 0; i < wc->w_num_pages; i++) {
1320 tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc,
1321 wc->w_pages[i], cpos,
1332 * We only have cleanup to do in case of allocating write.
1335 ocfs2_write_failure(inode, wc, user_pos, user_len);
1342 static int ocfs2_write_cluster_by_desc(struct address_space *mapping,
1343 struct ocfs2_alloc_context *data_ac,
1344 struct ocfs2_alloc_context *meta_ac,
1345 struct ocfs2_write_ctxt *wc,
1346 loff_t pos, unsigned len)
1350 unsigned int local_len = len;
1351 struct ocfs2_write_cluster_desc *desc;
1352 struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb);
1354 for (i = 0; i < wc->w_clen; i++) {
1355 desc = &wc->w_desc[i];
1358 * We have to make sure that the total write passed in
1359 * doesn't extend past a single cluster.
1362 cluster_off = pos & (osb->s_clustersize - 1);
1363 if ((cluster_off + local_len) > osb->s_clustersize)
1364 local_len = osb->s_clustersize - cluster_off;
1366 ret = ocfs2_write_cluster(mapping, desc->c_phys,
1367 desc->c_unwritten, data_ac, meta_ac,
1368 wc, desc->c_cpos, pos, local_len);
1384 * ocfs2_write_end() wants to know which parts of the target page it
1385 * should complete the write on. It's easiest to compute them ahead of
1386 * time when a more complete view of the write is available.
1388 static void ocfs2_set_target_boundaries(struct ocfs2_super *osb,
1389 struct ocfs2_write_ctxt *wc,
1390 loff_t pos, unsigned len, int alloc)
1392 struct ocfs2_write_cluster_desc *desc;
1394 wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1);
1395 wc->w_target_to = wc->w_target_from + len;
1401 * Allocating write - we may have different boundaries based
1402 * on page size and cluster size.
1404 * NOTE: We can no longer compute one value from the other as
1405 * the actual write length and user provided length may be
1409 if (wc->w_large_pages) {
1411 * We only care about the 1st and last cluster within
1412 * our range and whether they should be zero'd or not. Either
1413 * value may be extended out to the start/end of a
1414 * newly allocated cluster.
1416 desc = &wc->w_desc[0];
1417 if (ocfs2_should_zero_cluster(desc))
1418 ocfs2_figure_cluster_boundaries(osb,
1423 desc = &wc->w_desc[wc->w_clen - 1];
1424 if (ocfs2_should_zero_cluster(desc))
1425 ocfs2_figure_cluster_boundaries(osb,
1430 wc->w_target_from = 0;
1431 wc->w_target_to = PAGE_CACHE_SIZE;
1436 * Populate each single-cluster write descriptor in the write context
1437 * with information about the i/o to be done.
1439 * Returns the number of clusters that will have to be allocated, as
1440 * well as a worst case estimate of the number of extent records that
1441 * would have to be created during a write to an unwritten region.
1443 static int ocfs2_populate_write_desc(struct inode *inode,
1444 struct ocfs2_write_ctxt *wc,
1445 unsigned int *clusters_to_alloc,
1446 unsigned int *extents_to_split)
1449 struct ocfs2_write_cluster_desc *desc;
1450 unsigned int num_clusters = 0;
1451 unsigned int ext_flags = 0;
1455 *clusters_to_alloc = 0;
1456 *extents_to_split = 0;
1458 for (i = 0; i < wc->w_clen; i++) {
1459 desc = &wc->w_desc[i];
1460 desc->c_cpos = wc->w_cpos + i;
1462 if (num_clusters == 0) {
1464 * Need to look up the next extent record.
1466 ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys,
1467 &num_clusters, &ext_flags);
1474 * Assume worst case - that we're writing in
1475 * the middle of the extent.
1477 * We can assume that the write proceeds from
1478 * left to right, in which case the extent
1479 * insert code is smart enough to coalesce the
1480 * next splits into the previous records created.
1482 if (ext_flags & OCFS2_EXT_UNWRITTEN)
1483 *extents_to_split = *extents_to_split + 2;
1486 * Only increment phys if it doesn't describe
1492 desc->c_phys = phys;
1495 *clusters_to_alloc = *clusters_to_alloc + 1;
1497 if (ext_flags & OCFS2_EXT_UNWRITTEN)
1498 desc->c_unwritten = 1;
1508 static int ocfs2_write_begin_inline(struct address_space *mapping,
1509 struct inode *inode,
1510 struct ocfs2_write_ctxt *wc)
1513 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1516 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1518 page = find_or_create_page(mapping, 0, GFP_NOFS);
1525 * If we don't set w_num_pages then this page won't get unlocked
1526 * and freed on cleanup of the write context.
1528 wc->w_pages[0] = wc->w_target_page = page;
1529 wc->w_num_pages = 1;
1531 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1532 if (IS_ERR(handle)) {
1533 ret = PTR_ERR(handle);
1538 ret = ocfs2_journal_access(handle, inode, wc->w_di_bh,
1539 OCFS2_JOURNAL_ACCESS_WRITE);
1541 ocfs2_commit_trans(osb, handle);
1547 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1548 ocfs2_set_inode_data_inline(inode, di);
1550 if (!PageUptodate(page)) {
1551 ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
1553 ocfs2_commit_trans(osb, handle);
1559 wc->w_handle = handle;
1564 int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
1566 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1568 if (new_size <= le16_to_cpu(di->id2.i_data.id_count))
1573 static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
1574 struct inode *inode, loff_t pos,
1575 unsigned len, struct page *mmap_page,
1576 struct ocfs2_write_ctxt *wc)
1578 int ret, written = 0;
1579 loff_t end = pos + len;
1580 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1582 mlog(0, "Inode %llu, write of %u bytes at off %llu. features: 0x%x\n",
1583 (unsigned long long)oi->ip_blkno, len, (unsigned long long)pos,
1584 oi->ip_dyn_features);
1587 * Handle inodes which already have inline data 1st.
1589 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1590 if (mmap_page == NULL &&
1591 ocfs2_size_fits_inline_data(wc->w_di_bh, end))
1592 goto do_inline_write;
1595 * The write won't fit - we have to give this inode an
1596 * inline extent list now.
1598 ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh);
1605 * Check whether the inode can accept inline data.
1607 if (oi->ip_clusters != 0 || i_size_read(inode) != 0)
1611 * Check whether the write can fit.
1613 if (mmap_page || end > ocfs2_max_inline_data(inode->i_sb))
1617 ret = ocfs2_write_begin_inline(mapping, inode, wc);
1624 * This signals to the caller that the data can be written
1629 return written ? written : ret;
1633 * This function only does anything for file systems which can't
1634 * handle sparse files.
1636 * What we want to do here is fill in any hole between the current end
1637 * of allocation and the end of our write. That way the rest of the
1638 * write path can treat it as an non-allocating write, which has no
1639 * special case code for sparse/nonsparse files.
1641 static int ocfs2_expand_nonsparse_inode(struct inode *inode, loff_t pos,
1643 struct ocfs2_write_ctxt *wc)
1646 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1647 loff_t newsize = pos + len;
1649 if (ocfs2_sparse_alloc(osb))
1652 if (newsize <= i_size_read(inode))
1655 ret = ocfs2_extend_no_holes(inode, newsize, newsize - len);
1662 int ocfs2_write_begin_nolock(struct address_space *mapping,
1663 loff_t pos, unsigned len, unsigned flags,
1664 struct page **pagep, void **fsdata,
1665 struct buffer_head *di_bh, struct page *mmap_page)
1667 int ret, credits = OCFS2_INODE_UPDATE_CREDITS;
1668 unsigned int clusters_to_alloc, extents_to_split;
1669 struct ocfs2_write_ctxt *wc;
1670 struct inode *inode = mapping->host;
1671 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1672 struct ocfs2_dinode *di;
1673 struct ocfs2_alloc_context *data_ac = NULL;
1674 struct ocfs2_alloc_context *meta_ac = NULL;
1676 struct ocfs2_extent_tree et;
1678 ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh);
1684 if (ocfs2_supports_inline_data(osb)) {
1685 ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len,
1697 ret = ocfs2_expand_nonsparse_inode(inode, pos, len, wc);
1703 ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
1710 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1713 * We set w_target_from, w_target_to here so that
1714 * ocfs2_write_end() knows which range in the target page to
1715 * write out. An allocation requires that we write the entire
1718 if (clusters_to_alloc || extents_to_split) {
1720 * XXX: We are stretching the limits of
1721 * ocfs2_lock_allocators(). It greatly over-estimates
1722 * the work to be done.
1724 mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u,"
1725 " clusters_to_add = %u, extents_to_split = %u\n",
1726 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1727 (long long)i_size_read(inode), le32_to_cpu(di->i_clusters),
1728 clusters_to_alloc, extents_to_split);
1730 ocfs2_init_dinode_extent_tree(&et, inode, wc->w_di_bh);
1731 ret = ocfs2_lock_allocators(inode, &et,
1732 clusters_to_alloc, extents_to_split,
1733 &data_ac, &meta_ac);
1739 credits = ocfs2_calc_extend_credits(inode->i_sb,
1745 ocfs2_set_target_boundaries(osb, wc, pos, len,
1746 clusters_to_alloc + extents_to_split);
1748 handle = ocfs2_start_trans(osb, credits);
1749 if (IS_ERR(handle)) {
1750 ret = PTR_ERR(handle);
1755 wc->w_handle = handle;
1758 * We don't want this to fail in ocfs2_write_end(), so do it
1761 ret = ocfs2_journal_access(handle, inode, wc->w_di_bh,
1762 OCFS2_JOURNAL_ACCESS_WRITE);
1769 * Fill our page array first. That way we've grabbed enough so
1770 * that we can zero and flush if we error after adding the
1773 ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos,
1774 clusters_to_alloc + extents_to_split,
1781 ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos,
1789 ocfs2_free_alloc_context(data_ac);
1791 ocfs2_free_alloc_context(meta_ac);
1794 *pagep = wc->w_target_page;
1798 ocfs2_commit_trans(osb, handle);
1801 ocfs2_free_write_ctxt(wc);
1804 ocfs2_free_alloc_context(data_ac);
1806 ocfs2_free_alloc_context(meta_ac);
1810 static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
1811 loff_t pos, unsigned len, unsigned flags,
1812 struct page **pagep, void **fsdata)
1815 struct buffer_head *di_bh = NULL;
1816 struct inode *inode = mapping->host;
1818 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1825 * Take alloc sem here to prevent concurrent lookups. That way
1826 * the mapping, zeroing and tree manipulation within
1827 * ocfs2_write() will be safe against ->readpage(). This
1828 * should also serve to lock out allocation from a shared
1831 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1833 ret = ocfs2_write_begin_nolock(mapping, pos, len, flags, pagep,
1834 fsdata, di_bh, NULL);
1845 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1848 ocfs2_inode_unlock(inode, 1);
1853 static void ocfs2_write_end_inline(struct inode *inode, loff_t pos,
1854 unsigned len, unsigned *copied,
1855 struct ocfs2_dinode *di,
1856 struct ocfs2_write_ctxt *wc)
1860 if (unlikely(*copied < len)) {
1861 if (!PageUptodate(wc->w_target_page)) {
1867 kaddr = kmap_atomic(wc->w_target_page, KM_USER0);
1868 memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied);
1869 kunmap_atomic(kaddr, KM_USER0);
1871 mlog(0, "Data written to inode at offset %llu. "
1872 "id_count = %u, copied = %u, i_dyn_features = 0x%x\n",
1873 (unsigned long long)pos, *copied,
1874 le16_to_cpu(di->id2.i_data.id_count),
1875 le16_to_cpu(di->i_dyn_features));
1878 int ocfs2_write_end_nolock(struct address_space *mapping,
1879 loff_t pos, unsigned len, unsigned copied,
1880 struct page *page, void *fsdata)
1883 unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1);
1884 struct inode *inode = mapping->host;
1885 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1886 struct ocfs2_write_ctxt *wc = fsdata;
1887 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1888 handle_t *handle = wc->w_handle;
1889 struct page *tmppage;
1891 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1892 ocfs2_write_end_inline(inode, pos, len, &copied, di, wc);
1893 goto out_write_size;
1896 if (unlikely(copied < len)) {
1897 if (!PageUptodate(wc->w_target_page))
1900 ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
1903 flush_dcache_page(wc->w_target_page);
1905 for(i = 0; i < wc->w_num_pages; i++) {
1906 tmppage = wc->w_pages[i];
1908 if (tmppage == wc->w_target_page) {
1909 from = wc->w_target_from;
1910 to = wc->w_target_to;
1912 BUG_ON(from > PAGE_CACHE_SIZE ||
1913 to > PAGE_CACHE_SIZE ||
1917 * Pages adjacent to the target (if any) imply
1918 * a hole-filling write in which case we want
1919 * to flush their entire range.
1922 to = PAGE_CACHE_SIZE;
1925 if (page_has_buffers(tmppage)) {
1926 if (ocfs2_should_order_data(inode)) {
1927 ocfs2_jbd2_file_inode(wc->w_handle, inode);
1928 #ifdef CONFIG_OCFS2_COMPAT_JBD
1929 walk_page_buffers(wc->w_handle,
1930 page_buffers(tmppage),
1932 ocfs2_journal_dirty_data);
1935 block_commit_write(tmppage, from, to);
1941 if (pos > inode->i_size) {
1942 i_size_write(inode, pos);
1943 mark_inode_dirty(inode);
1945 inode->i_blocks = ocfs2_inode_sector_count(inode);
1946 di->i_size = cpu_to_le64((u64)i_size_read(inode));
1947 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1948 di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
1949 di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
1950 ocfs2_journal_dirty(handle, wc->w_di_bh);
1952 ocfs2_commit_trans(osb, handle);
1954 ocfs2_run_deallocs(osb, &wc->w_dealloc);
1956 ocfs2_free_write_ctxt(wc);
1961 static int ocfs2_write_end(struct file *file, struct address_space *mapping,
1962 loff_t pos, unsigned len, unsigned copied,
1963 struct page *page, void *fsdata)
1966 struct inode *inode = mapping->host;
1968 ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata);
1970 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1971 ocfs2_inode_unlock(inode, 1);
1976 const struct address_space_operations ocfs2_aops = {
1977 .readpage = ocfs2_readpage,
1978 .readpages = ocfs2_readpages,
1979 .writepage = ocfs2_writepage,
1980 .write_begin = ocfs2_write_begin,
1981 .write_end = ocfs2_write_end,
1983 .sync_page = block_sync_page,
1984 .direct_IO = ocfs2_direct_IO,
1985 .invalidatepage = ocfs2_invalidatepage,
1986 .releasepage = ocfs2_releasepage,
1987 .migratepage = buffer_migrate_page,