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>
30 #include <linux/quotaops.h>
31 #include <linux/blkdev.h>
32 #include <linux/uio.h>
34 #include <cluster/masklog.h>
41 #include "extent_map.h"
48 #include "refcounttree.h"
49 #include "ocfs2_trace.h"
51 #include "buffer_head_io.h"
56 static int ocfs2_symlink_get_block(struct inode
*inode
, sector_t iblock
,
57 struct buffer_head
*bh_result
, int create
)
61 struct ocfs2_dinode
*fe
= NULL
;
62 struct buffer_head
*bh
= NULL
;
63 struct buffer_head
*buffer_cache_bh
= NULL
;
64 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
67 trace_ocfs2_symlink_get_block(
68 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
69 (unsigned long long)iblock
, bh_result
, create
);
71 BUG_ON(ocfs2_inode_is_fast_symlink(inode
));
73 if ((iblock
<< inode
->i_sb
->s_blocksize_bits
) > PATH_MAX
+ 1) {
74 mlog(ML_ERROR
, "block offset > PATH_MAX: %llu",
75 (unsigned long long)iblock
);
79 status
= ocfs2_read_inode_block(inode
, &bh
);
84 fe
= (struct ocfs2_dinode
*) bh
->b_data
;
86 if ((u64
)iblock
>= ocfs2_clusters_to_blocks(inode
->i_sb
,
87 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
) {
102 mlog(ML_ERROR
, "couldn't getblock for symlink!\n");
106 /* we haven't locked out transactions, so a commit
107 * could've happened. Since we've got a reference on
108 * the bh, even if it commits while we're doing the
109 * copy, the data is still good. */
110 if (buffer_jbd(buffer_cache_bh
)
111 && ocfs2_inode_is_new(inode
)) {
112 kaddr
= kmap_atomic(bh_result
->b_page
);
114 mlog(ML_ERROR
, "couldn't kmap!\n");
117 memcpy(kaddr
+ (bh_result
->b_size
* iblock
),
118 buffer_cache_bh
->b_data
,
120 kunmap_atomic(kaddr
);
121 set_buffer_uptodate(bh_result
);
123 brelse(buffer_cache_bh
);
126 map_bh(bh_result
, inode
->i_sb
,
127 le64_to_cpu(fe
->id2
.i_list
.l_recs
[0].e_blkno
) + iblock
);
137 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 trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode
)->ip_blkno
,
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_write_begin() 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
);
208 past_eof
= ocfs2_blocks_for_bytes(inode
->i_sb
, i_size_read(inode
));
210 trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode
)->ip_blkno
,
211 (unsigned long long)past_eof
);
212 if (create
&& (iblock
>= past_eof
))
213 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_with_xattr(inode
->i_sb
, di
)) {
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
);
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
);
254 SetPageUptodate(page
);
259 static int ocfs2_readpage_inline(struct inode
*inode
, struct page
*page
)
262 struct buffer_head
*di_bh
= NULL
;
264 BUG_ON(!PageLocked(page
));
265 BUG_ON(!(OCFS2_I(inode
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
));
267 ret
= ocfs2_read_inode_block(inode
, &di_bh
);
273 ret
= ocfs2_read_inline_data(inode
, page
, di_bh
);
281 static int ocfs2_readpage(struct file
*file
, struct page
*page
)
283 struct inode
*inode
= page
->mapping
->host
;
284 struct ocfs2_inode_info
*oi
= OCFS2_I(inode
);
285 loff_t start
= (loff_t
)page
->index
<< PAGE_CACHE_SHIFT
;
288 trace_ocfs2_readpage((unsigned long long)oi
->ip_blkno
,
289 (page
? page
->index
: 0));
291 ret
= ocfs2_inode_lock_with_page(inode
, NULL
, 0, page
);
293 if (ret
== AOP_TRUNCATED_PAGE
)
299 if (down_read_trylock(&oi
->ip_alloc_sem
) == 0) {
301 * Unlock the page and cycle ip_alloc_sem so that we don't
302 * busyloop waiting for ip_alloc_sem to unlock
304 ret
= AOP_TRUNCATED_PAGE
;
307 down_read(&oi
->ip_alloc_sem
);
308 up_read(&oi
->ip_alloc_sem
);
309 goto out_inode_unlock
;
313 * i_size might have just been updated as we grabed the meta lock. We
314 * might now be discovering a truncate that hit on another node.
315 * block_read_full_page->get_block freaks out if it is asked to read
316 * beyond the end of a file, so we check here. Callers
317 * (generic_file_read, vm_ops->fault) are clever enough to check i_size
318 * and notice that the page they just read isn't needed.
320 * XXX sys_readahead() seems to get that wrong?
322 if (start
>= i_size_read(inode
)) {
323 zero_user(page
, 0, PAGE_SIZE
);
324 SetPageUptodate(page
);
329 if (oi
->ip_dyn_features
& OCFS2_INLINE_DATA_FL
)
330 ret
= ocfs2_readpage_inline(inode
, page
);
332 ret
= block_read_full_page(page
, ocfs2_get_block
);
336 up_read(&OCFS2_I(inode
)->ip_alloc_sem
);
338 ocfs2_inode_unlock(inode
, 0);
346 * This is used only for read-ahead. Failures or difficult to handle
347 * situations are safe to ignore.
349 * Right now, we don't bother with BH_Boundary - in-inode extent lists
350 * are quite large (243 extents on 4k blocks), so most inodes don't
351 * grow out to a tree. If need be, detecting boundary extents could
352 * trivially be added in a future version of ocfs2_get_block().
354 static int ocfs2_readpages(struct file
*filp
, struct address_space
*mapping
,
355 struct list_head
*pages
, unsigned nr_pages
)
358 struct inode
*inode
= mapping
->host
;
359 struct ocfs2_inode_info
*oi
= OCFS2_I(inode
);
364 * Use the nonblocking flag for the dlm code to avoid page
365 * lock inversion, but don't bother with retrying.
367 ret
= ocfs2_inode_lock_full(inode
, NULL
, 0, OCFS2_LOCK_NONBLOCK
);
371 if (down_read_trylock(&oi
->ip_alloc_sem
) == 0) {
372 ocfs2_inode_unlock(inode
, 0);
377 * Don't bother with inline-data. There isn't anything
378 * to read-ahead in that case anyway...
380 if (oi
->ip_dyn_features
& OCFS2_INLINE_DATA_FL
)
384 * Check whether a remote node truncated this file - we just
385 * drop out in that case as it's not worth handling here.
387 last
= list_entry(pages
->prev
, struct page
, lru
);
388 start
= (loff_t
)last
->index
<< PAGE_CACHE_SHIFT
;
389 if (start
>= i_size_read(inode
))
392 err
= mpage_readpages(mapping
, pages
, nr_pages
, ocfs2_get_block
);
395 up_read(&oi
->ip_alloc_sem
);
396 ocfs2_inode_unlock(inode
, 0);
401 /* Note: Because we don't support holes, our allocation has
402 * already happened (allocation writes zeros to the file data)
403 * so we don't have to worry about ordered writes in
406 * ->writepage is called during the process of invalidating the page cache
407 * during blocked lock processing. It can't block on any cluster locks
408 * to during block mapping. It's relying on the fact that the block
409 * mapping can't have disappeared under the dirty pages that it is
410 * being asked to write back.
412 static int ocfs2_writepage(struct page
*page
, struct writeback_control
*wbc
)
414 trace_ocfs2_writepage(
415 (unsigned long long)OCFS2_I(page
->mapping
->host
)->ip_blkno
,
418 return block_write_full_page(page
, ocfs2_get_block
, wbc
);
421 /* Taken from ext3. We don't necessarily need the full blown
422 * functionality yet, but IMHO it's better to cut and paste the whole
423 * thing so we can avoid introducing our own bugs (and easily pick up
424 * their fixes when they happen) --Mark */
425 int walk_page_buffers( handle_t
*handle
,
426 struct buffer_head
*head
,
430 int (*fn
)( handle_t
*handle
,
431 struct buffer_head
*bh
))
433 struct buffer_head
*bh
;
434 unsigned block_start
, block_end
;
435 unsigned blocksize
= head
->b_size
;
437 struct buffer_head
*next
;
439 for ( bh
= head
, block_start
= 0;
440 ret
== 0 && (bh
!= head
|| !block_start
);
441 block_start
= block_end
, bh
= next
)
443 next
= bh
->b_this_page
;
444 block_end
= block_start
+ blocksize
;
445 if (block_end
<= from
|| block_start
>= to
) {
446 if (partial
&& !buffer_uptodate(bh
))
450 err
= (*fn
)(handle
, bh
);
457 static sector_t
ocfs2_bmap(struct address_space
*mapping
, sector_t block
)
462 struct inode
*inode
= mapping
->host
;
464 trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode
)->ip_blkno
,
465 (unsigned long long)block
);
467 /* We don't need to lock journal system files, since they aren't
468 * accessed concurrently from multiple nodes.
470 if (!INODE_JOURNAL(inode
)) {
471 err
= ocfs2_inode_lock(inode
, NULL
, 0);
477 down_read(&OCFS2_I(inode
)->ip_alloc_sem
);
480 if (!(OCFS2_I(inode
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
))
481 err
= ocfs2_extent_map_get_blocks(inode
, block
, &p_blkno
, NULL
,
484 if (!INODE_JOURNAL(inode
)) {
485 up_read(&OCFS2_I(inode
)->ip_alloc_sem
);
486 ocfs2_inode_unlock(inode
, 0);
490 mlog(ML_ERROR
, "get_blocks() failed, block = %llu\n",
491 (unsigned long long)block
);
497 status
= err
? 0 : p_blkno
;
503 * TODO: Make this into a generic get_blocks function.
505 * From do_direct_io in direct-io.c:
506 * "So what we do is to permit the ->get_blocks function to populate
507 * bh.b_size with the size of IO which is permitted at this offset and
510 * This function is called directly from get_more_blocks in direct-io.c.
512 * called like this: dio->get_blocks(dio->inode, fs_startblk,
513 * fs_count, map_bh, dio->rw == WRITE);
515 static int ocfs2_direct_IO_get_blocks(struct inode
*inode
, sector_t iblock
,
516 struct buffer_head
*bh_result
, int create
)
520 int alloc_locked
= 0;
521 u64 p_blkno
, inode_blocks
, contig_blocks
;
522 unsigned int ext_flags
;
523 unsigned char blocksize_bits
= inode
->i_sb
->s_blocksize_bits
;
524 unsigned long max_blocks
= bh_result
->b_size
>> inode
->i_blkbits
;
525 unsigned long len
= bh_result
->b_size
;
526 unsigned int clusters_to_alloc
= 0, contig_clusters
= 0;
528 cpos
= ocfs2_blocks_to_clusters(inode
->i_sb
, iblock
);
530 /* This function won't even be called if the request isn't all
531 * nicely aligned and of the right size, so there's no need
532 * for us to check any of that. */
534 inode_blocks
= ocfs2_blocks_for_bytes(inode
->i_sb
, i_size_read(inode
));
536 down_read(&OCFS2_I(inode
)->ip_alloc_sem
);
538 /* This figures out the size of the next contiguous block, and
539 * our logical offset */
540 ret
= ocfs2_extent_map_get_blocks(inode
, iblock
, &p_blkno
,
541 &contig_blocks
, &ext_flags
);
542 up_read(&OCFS2_I(inode
)->ip_alloc_sem
);
545 mlog(ML_ERROR
, "get_blocks() failed iblock=%llu\n",
546 (unsigned long long)iblock
);
551 /* We should already CoW the refcounted extent in case of create. */
552 BUG_ON(create
&& (ext_flags
& OCFS2_EXT_REFCOUNTED
));
554 /* allocate blocks if no p_blkno is found, and create == 1 */
555 if (!p_blkno
&& create
) {
556 ret
= ocfs2_inode_lock(inode
, NULL
, 1);
564 down_write(&OCFS2_I(inode
)->ip_alloc_sem
);
566 /* fill hole, allocate blocks can't be larger than the size
568 clusters_to_alloc
= ocfs2_clusters_for_bytes(inode
->i_sb
, len
);
569 contig_clusters
= ocfs2_clusters_for_blocks(inode
->i_sb
,
571 if (clusters_to_alloc
> contig_clusters
)
572 clusters_to_alloc
= contig_clusters
;
574 /* allocate extent and insert them into the extent tree */
575 ret
= ocfs2_extend_allocation(inode
, cpos
,
576 clusters_to_alloc
, 0);
578 up_write(&OCFS2_I(inode
)->ip_alloc_sem
);
583 ret
= ocfs2_extent_map_get_blocks(inode
, iblock
, &p_blkno
,
584 &contig_blocks
, &ext_flags
);
586 up_write(&OCFS2_I(inode
)->ip_alloc_sem
);
587 mlog(ML_ERROR
, "get_blocks() failed iblock=%llu\n",
588 (unsigned long long)iblock
);
592 up_write(&OCFS2_I(inode
)->ip_alloc_sem
);
596 * get_more_blocks() expects us to describe a hole by clearing
597 * the mapped bit on bh_result().
599 * Consider an unwritten extent as a hole.
601 if (p_blkno
&& !(ext_flags
& OCFS2_EXT_UNWRITTEN
))
602 map_bh(bh_result
, inode
->i_sb
, p_blkno
);
604 clear_buffer_mapped(bh_result
);
606 /* make sure we don't map more than max_blocks blocks here as
607 that's all the kernel will handle at this point. */
608 if (max_blocks
< contig_blocks
)
609 contig_blocks
= max_blocks
;
610 bh_result
->b_size
= contig_blocks
<< blocksize_bits
;
613 ocfs2_inode_unlock(inode
, 1);
618 * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're
619 * particularly interested in the aio/dio case. We use the rw_lock DLM lock
620 * to protect io on one node from truncation on another.
622 static void ocfs2_dio_end_io(struct kiocb
*iocb
,
627 struct inode
*inode
= file_inode(iocb
->ki_filp
);
630 /* this io's submitter should not have unlocked this before we could */
631 BUG_ON(!ocfs2_iocb_is_rw_locked(iocb
));
633 if (ocfs2_iocb_is_unaligned_aio(iocb
)) {
634 ocfs2_iocb_clear_unaligned_aio(iocb
);
636 mutex_unlock(&OCFS2_I(inode
)->ip_unaligned_aio
);
639 /* Let rw unlock to be done later to protect append direct io write */
640 if (offset
+ bytes
<= i_size_read(inode
)) {
641 ocfs2_iocb_clear_rw_locked(iocb
);
643 level
= ocfs2_iocb_rw_locked_level(iocb
);
644 ocfs2_rw_unlock(inode
, level
);
648 static int ocfs2_releasepage(struct page
*page
, gfp_t wait
)
650 if (!page_has_buffers(page
))
652 return try_to_free_buffers(page
);
655 static int ocfs2_is_overwrite(struct ocfs2_super
*osb
,
656 struct inode
*inode
, loff_t offset
)
661 unsigned int num_clusters
= 0;
662 unsigned int ext_flags
= 0;
664 v_cpos
= ocfs2_bytes_to_clusters(osb
->sb
, offset
);
665 ret
= ocfs2_get_clusters(inode
, v_cpos
, &p_cpos
,
666 &num_clusters
, &ext_flags
);
672 if (p_cpos
&& !(ext_flags
& OCFS2_EXT_UNWRITTEN
))
678 static int ocfs2_direct_IO_zero_extend(struct ocfs2_super
*osb
,
679 struct inode
*inode
, loff_t offset
,
680 u64 zero_len
, int cluster_align
)
683 u32 v_cpos
= ocfs2_bytes_to_clusters(osb
->sb
, i_size_read(inode
));
684 unsigned int num_clusters
= 0;
685 unsigned int ext_flags
= 0;
688 if (offset
<= i_size_read(inode
) || cluster_align
)
691 ret
= ocfs2_get_clusters(inode
, v_cpos
, &p_cpos
, &num_clusters
,
698 if (p_cpos
&& !(ext_flags
& OCFS2_EXT_UNWRITTEN
)) {
699 u64 s
= i_size_read(inode
);
700 sector_t sector
= ((u64
)p_cpos
<< (osb
->s_clustersize_bits
- 9)) +
701 (do_div(s
, osb
->s_clustersize
) >> 9);
703 ret
= blkdev_issue_zeroout(osb
->sb
->s_bdev
, sector
,
704 zero_len
>> 9, GFP_NOFS
, false);
712 static int ocfs2_direct_IO_extend_no_holes(struct ocfs2_super
*osb
,
713 struct inode
*inode
, loff_t offset
)
715 u64 zero_start
, zero_len
, total_zero_len
;
716 u32 p_cpos
= 0, clusters_to_add
;
717 u32 v_cpos
= ocfs2_bytes_to_clusters(osb
->sb
, i_size_read(inode
));
718 unsigned int num_clusters
= 0;
719 unsigned int ext_flags
= 0;
720 u32 size_div
, offset_div
;
725 u64 s
= i_size_read(inode
);
727 offset_div
= do_div(o
, osb
->s_clustersize
);
728 size_div
= do_div(s
, osb
->s_clustersize
);
731 if (offset
<= i_size_read(inode
))
734 clusters_to_add
= ocfs2_bytes_to_clusters(inode
->i_sb
, offset
) -
735 ocfs2_bytes_to_clusters(inode
->i_sb
, i_size_read(inode
));
736 total_zero_len
= offset
- i_size_read(inode
);
738 total_zero_len
-= offset_div
;
740 /* Allocate clusters to fill out holes, and this is only needed
741 * when we add more than one clusters. Otherwise the cluster will
742 * be allocated during direct IO */
743 if (clusters_to_add
> 1) {
744 ret
= ocfs2_extend_allocation(inode
,
745 OCFS2_I(inode
)->ip_clusters
,
746 clusters_to_add
- 1, 0);
753 while (total_zero_len
) {
754 ret
= ocfs2_get_clusters(inode
, v_cpos
, &p_cpos
, &num_clusters
,
761 zero_start
= ocfs2_clusters_to_bytes(osb
->sb
, p_cpos
) +
763 zero_len
= ocfs2_clusters_to_bytes(osb
->sb
, num_clusters
) -
765 zero_len
= min(total_zero_len
, zero_len
);
767 if (p_cpos
&& !(ext_flags
& OCFS2_EXT_UNWRITTEN
)) {
768 ret
= blkdev_issue_zeroout(osb
->sb
->s_bdev
,
769 zero_start
>> 9, zero_len
>> 9,
777 total_zero_len
-= zero_len
;
778 v_cpos
+= ocfs2_bytes_to_clusters(osb
->sb
, zero_len
+ size_div
);
780 /* Only at first iteration can be cluster not aligned.
781 * So set size_div to 0 for the rest */
789 static ssize_t
ocfs2_direct_IO_write(struct kiocb
*iocb
,
790 struct iov_iter
*iter
,
795 bool orphaned
= false;
796 int is_overwrite
= 0;
797 struct file
*file
= iocb
->ki_filp
;
798 struct inode
*inode
= file_inode(file
)->i_mapping
->host
;
799 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
800 struct buffer_head
*di_bh
= NULL
;
801 size_t count
= iter
->count
;
802 journal_t
*journal
= osb
->journal
->j_journal
;
803 u64 zero_len_head
, zero_len_tail
;
804 int cluster_align_head
, cluster_align_tail
;
805 loff_t final_size
= offset
+ count
;
806 int append_write
= offset
>= i_size_read(inode
) ? 1 : 0;
807 unsigned int num_clusters
= 0;
808 unsigned int ext_flags
= 0;
812 u64 s
= i_size_read(inode
);
814 zero_len_head
= do_div(o
, 1 << osb
->s_clustersize_bits
);
815 cluster_align_head
= !zero_len_head
;
817 zero_len_tail
= osb
->s_clustersize
-
818 do_div(s
, osb
->s_clustersize
);
819 if ((offset
- i_size_read(inode
)) < zero_len_tail
)
820 zero_len_tail
= offset
- i_size_read(inode
);
821 cluster_align_tail
= !zero_len_tail
;
825 * when final_size > inode->i_size, inode->i_size will be
826 * updated after direct write, so add the inode to orphan
829 if (final_size
> i_size_read(inode
)) {
830 ret
= ocfs2_add_inode_to_orphan(osb
, inode
);
839 ret
= ocfs2_inode_lock(inode
, NULL
, 1);
845 /* zeroing out the previously allocated cluster tail
846 * that but not zeroed */
847 if (ocfs2_sparse_alloc(OCFS2_SB(inode
->i_sb
))) {
848 down_read(&OCFS2_I(inode
)->ip_alloc_sem
);
849 ret
= ocfs2_direct_IO_zero_extend(osb
, inode
, offset
,
850 zero_len_tail
, cluster_align_tail
);
851 up_read(&OCFS2_I(inode
)->ip_alloc_sem
);
853 down_write(&OCFS2_I(inode
)->ip_alloc_sem
);
854 ret
= ocfs2_direct_IO_extend_no_holes(osb
, inode
,
856 up_write(&OCFS2_I(inode
)->ip_alloc_sem
);
860 ocfs2_inode_unlock(inode
, 1);
864 is_overwrite
= ocfs2_is_overwrite(osb
, inode
, offset
);
865 if (is_overwrite
< 0) {
866 mlog_errno(is_overwrite
);
867 ocfs2_inode_unlock(inode
, 1);
871 ocfs2_inode_unlock(inode
, 1);
874 written
= __blockdev_direct_IO(iocb
, inode
, inode
->i_sb
->s_bdev
, iter
,
875 offset
, ocfs2_direct_IO_get_blocks
,
876 ocfs2_dio_end_io
, NULL
, 0);
877 /* overwrite aio may return -EIOCBQUEUED, and it is not an error */
878 if ((written
< 0) && (written
!= -EIOCBQUEUED
)) {
879 loff_t i_size
= i_size_read(inode
);
881 if (offset
+ count
> i_size
) {
882 ret
= ocfs2_inode_lock(inode
, &di_bh
, 1);
888 if (i_size
== i_size_read(inode
)) {
889 ret
= ocfs2_truncate_file(inode
, di_bh
,
895 ocfs2_inode_unlock(inode
, 1);
902 ocfs2_inode_unlock(inode
, 1);
906 ret
= jbd2_journal_force_commit(journal
);
910 } else if (written
> 0 && append_write
&& !is_overwrite
&&
911 !cluster_align_head
) {
912 /* zeroing out the allocated cluster head */
914 u32 v_cpos
= ocfs2_bytes_to_clusters(osb
->sb
, offset
);
916 ret
= ocfs2_inode_lock(inode
, NULL
, 0);
922 ret
= ocfs2_get_clusters(inode
, v_cpos
, &p_cpos
,
923 &num_clusters
, &ext_flags
);
926 ocfs2_inode_unlock(inode
, 0);
930 BUG_ON(!p_cpos
|| (ext_flags
& OCFS2_EXT_UNWRITTEN
));
932 ret
= blkdev_issue_zeroout(osb
->sb
->s_bdev
,
933 (u64
)p_cpos
<< (osb
->s_clustersize_bits
- 9),
934 zero_len_head
>> 9, GFP_NOFS
, false);
938 ocfs2_inode_unlock(inode
, 0);
944 int update_isize
= written
> 0 ? 1 : 0;
945 loff_t end
= update_isize
? offset
+ written
: 0;
947 tmp_ret
= ocfs2_inode_lock(inode
, &di_bh
, 1);
954 tmp_ret
= ocfs2_del_inode_from_orphan(osb
, inode
, di_bh
,
963 ocfs2_inode_unlock(inode
, 1);
966 tmp_ret
= jbd2_journal_force_commit(journal
);
979 static ssize_t
ocfs2_direct_IO(struct kiocb
*iocb
, struct iov_iter
*iter
,
982 struct file
*file
= iocb
->ki_filp
;
983 struct inode
*inode
= file_inode(file
)->i_mapping
->host
;
984 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
985 int full_coherency
= !(osb
->s_mount_opt
&
986 OCFS2_MOUNT_COHERENCY_BUFFERED
);
989 * Fallback to buffered I/O if we see an inode without
992 if (OCFS2_I(inode
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
)
995 /* Fallback to buffered I/O if we are appending and
996 * concurrent O_DIRECT writes are allowed.
998 if (i_size_read(inode
) <= offset
&& !full_coherency
)
1001 if (iov_iter_rw(iter
) == READ
)
1002 return __blockdev_direct_IO(iocb
, inode
, inode
->i_sb
->s_bdev
,
1004 ocfs2_direct_IO_get_blocks
,
1005 ocfs2_dio_end_io
, NULL
, 0);
1007 return ocfs2_direct_IO_write(iocb
, iter
, offset
);
1010 static void ocfs2_figure_cluster_boundaries(struct ocfs2_super
*osb
,
1012 unsigned int *start
,
1015 unsigned int cluster_start
= 0, cluster_end
= PAGE_CACHE_SIZE
;
1017 if (unlikely(PAGE_CACHE_SHIFT
> osb
->s_clustersize_bits
)) {
1020 cpp
= 1 << (PAGE_CACHE_SHIFT
- osb
->s_clustersize_bits
);
1022 cluster_start
= cpos
% cpp
;
1023 cluster_start
= cluster_start
<< osb
->s_clustersize_bits
;
1025 cluster_end
= cluster_start
+ osb
->s_clustersize
;
1028 BUG_ON(cluster_start
> PAGE_SIZE
);
1029 BUG_ON(cluster_end
> PAGE_SIZE
);
1032 *start
= cluster_start
;
1038 * 'from' and 'to' are the region in the page to avoid zeroing.
1040 * If pagesize > clustersize, this function will avoid zeroing outside
1041 * of the cluster boundary.
1043 * from == to == 0 is code for "zero the entire cluster region"
1045 static void ocfs2_clear_page_regions(struct page
*page
,
1046 struct ocfs2_super
*osb
, u32 cpos
,
1047 unsigned from
, unsigned to
)
1050 unsigned int cluster_start
, cluster_end
;
1052 ocfs2_figure_cluster_boundaries(osb
, cpos
, &cluster_start
, &cluster_end
);
1054 kaddr
= kmap_atomic(page
);
1057 if (from
> cluster_start
)
1058 memset(kaddr
+ cluster_start
, 0, from
- cluster_start
);
1059 if (to
< cluster_end
)
1060 memset(kaddr
+ to
, 0, cluster_end
- to
);
1062 memset(kaddr
+ cluster_start
, 0, cluster_end
- cluster_start
);
1065 kunmap_atomic(kaddr
);
1069 * Nonsparse file systems fully allocate before we get to the write
1070 * code. This prevents ocfs2_write() from tagging the write as an
1071 * allocating one, which means ocfs2_map_page_blocks() might try to
1072 * read-in the blocks at the tail of our file. Avoid reading them by
1073 * testing i_size against each block offset.
1075 static int ocfs2_should_read_blk(struct inode
*inode
, struct page
*page
,
1076 unsigned int block_start
)
1078 u64 offset
= page_offset(page
) + block_start
;
1080 if (ocfs2_sparse_alloc(OCFS2_SB(inode
->i_sb
)))
1083 if (i_size_read(inode
) > offset
)
1090 * Some of this taken from __block_write_begin(). We already have our
1091 * mapping by now though, and the entire write will be allocating or
1092 * it won't, so not much need to use BH_New.
1094 * This will also skip zeroing, which is handled externally.
1096 int ocfs2_map_page_blocks(struct page
*page
, u64
*p_blkno
,
1097 struct inode
*inode
, unsigned int from
,
1098 unsigned int to
, int new)
1101 struct buffer_head
*head
, *bh
, *wait
[2], **wait_bh
= wait
;
1102 unsigned int block_end
, block_start
;
1103 unsigned int bsize
= 1 << inode
->i_blkbits
;
1105 if (!page_has_buffers(page
))
1106 create_empty_buffers(page
, bsize
, 0);
1108 head
= page_buffers(page
);
1109 for (bh
= head
, block_start
= 0; bh
!= head
|| !block_start
;
1110 bh
= bh
->b_this_page
, block_start
+= bsize
) {
1111 block_end
= block_start
+ bsize
;
1113 clear_buffer_new(bh
);
1116 * Ignore blocks outside of our i/o range -
1117 * they may belong to unallocated clusters.
1119 if (block_start
>= to
|| block_end
<= from
) {
1120 if (PageUptodate(page
))
1121 set_buffer_uptodate(bh
);
1126 * For an allocating write with cluster size >= page
1127 * size, we always write the entire page.
1132 if (!buffer_mapped(bh
)) {
1133 map_bh(bh
, inode
->i_sb
, *p_blkno
);
1134 unmap_underlying_metadata(bh
->b_bdev
, bh
->b_blocknr
);
1137 if (PageUptodate(page
)) {
1138 if (!buffer_uptodate(bh
))
1139 set_buffer_uptodate(bh
);
1140 } else if (!buffer_uptodate(bh
) && !buffer_delay(bh
) &&
1142 ocfs2_should_read_blk(inode
, page
, block_start
) &&
1143 (block_start
< from
|| block_end
> to
)) {
1144 ll_rw_block(READ
, 1, &bh
);
1148 *p_blkno
= *p_blkno
+ 1;
1152 * If we issued read requests - let them complete.
1154 while(wait_bh
> wait
) {
1155 wait_on_buffer(*--wait_bh
);
1156 if (!buffer_uptodate(*wait_bh
))
1160 if (ret
== 0 || !new)
1164 * If we get -EIO above, zero out any newly allocated blocks
1165 * to avoid exposing stale data.
1170 block_end
= block_start
+ bsize
;
1171 if (block_end
<= from
)
1173 if (block_start
>= to
)
1176 zero_user(page
, block_start
, bh
->b_size
);
1177 set_buffer_uptodate(bh
);
1178 mark_buffer_dirty(bh
);
1181 block_start
= block_end
;
1182 bh
= bh
->b_this_page
;
1183 } while (bh
!= head
);
1188 #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE)
1189 #define OCFS2_MAX_CTXT_PAGES 1
1191 #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE)
1194 #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE)
1197 * Describe the state of a single cluster to be written to.
1199 struct ocfs2_write_cluster_desc
{
1203 * Give this a unique field because c_phys eventually gets
1207 unsigned c_unwritten
;
1208 unsigned c_needs_zero
;
1211 struct ocfs2_write_ctxt
{
1212 /* Logical cluster position / len of write */
1216 /* First cluster allocated in a nonsparse extend */
1217 u32 w_first_new_cpos
;
1219 struct ocfs2_write_cluster_desc w_desc
[OCFS2_MAX_CLUSTERS_PER_PAGE
];
1222 * This is true if page_size > cluster_size.
1224 * It triggers a set of special cases during write which might
1225 * have to deal with allocating writes to partial pages.
1227 unsigned int w_large_pages
;
1230 * Pages involved in this write.
1232 * w_target_page is the page being written to by the user.
1234 * w_pages is an array of pages which always contains
1235 * w_target_page, and in the case of an allocating write with
1236 * page_size < cluster size, it will contain zero'd and mapped
1237 * pages adjacent to w_target_page which need to be written
1238 * out in so that future reads from that region will get
1241 unsigned int w_num_pages
;
1242 struct page
*w_pages
[OCFS2_MAX_CTXT_PAGES
];
1243 struct page
*w_target_page
;
1246 * w_target_locked is used for page_mkwrite path indicating no unlocking
1247 * against w_target_page in ocfs2_write_end_nolock.
1249 unsigned int w_target_locked
:1;
1252 * ocfs2_write_end() uses this to know what the real range to
1253 * write in the target should be.
1255 unsigned int w_target_from
;
1256 unsigned int w_target_to
;
1259 * We could use journal_current_handle() but this is cleaner,
1264 struct buffer_head
*w_di_bh
;
1266 struct ocfs2_cached_dealloc_ctxt w_dealloc
;
1269 void ocfs2_unlock_and_free_pages(struct page
**pages
, int num_pages
)
1273 for(i
= 0; i
< num_pages
; i
++) {
1275 unlock_page(pages
[i
]);
1276 mark_page_accessed(pages
[i
]);
1277 page_cache_release(pages
[i
]);
1282 static void ocfs2_unlock_pages(struct ocfs2_write_ctxt
*wc
)
1287 * w_target_locked is only set to true in the page_mkwrite() case.
1288 * The intent is to allow us to lock the target page from write_begin()
1289 * to write_end(). The caller must hold a ref on w_target_page.
1291 if (wc
->w_target_locked
) {
1292 BUG_ON(!wc
->w_target_page
);
1293 for (i
= 0; i
< wc
->w_num_pages
; i
++) {
1294 if (wc
->w_target_page
== wc
->w_pages
[i
]) {
1295 wc
->w_pages
[i
] = NULL
;
1299 mark_page_accessed(wc
->w_target_page
);
1300 page_cache_release(wc
->w_target_page
);
1302 ocfs2_unlock_and_free_pages(wc
->w_pages
, wc
->w_num_pages
);
1305 static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt
*wc
)
1307 ocfs2_unlock_pages(wc
);
1308 brelse(wc
->w_di_bh
);
1312 static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt
**wcp
,
1313 struct ocfs2_super
*osb
, loff_t pos
,
1314 unsigned len
, struct buffer_head
*di_bh
)
1317 struct ocfs2_write_ctxt
*wc
;
1319 wc
= kzalloc(sizeof(struct ocfs2_write_ctxt
), GFP_NOFS
);
1323 wc
->w_cpos
= pos
>> osb
->s_clustersize_bits
;
1324 wc
->w_first_new_cpos
= UINT_MAX
;
1325 cend
= (pos
+ len
- 1) >> osb
->s_clustersize_bits
;
1326 wc
->w_clen
= cend
- wc
->w_cpos
+ 1;
1328 wc
->w_di_bh
= di_bh
;
1330 if (unlikely(PAGE_CACHE_SHIFT
> osb
->s_clustersize_bits
))
1331 wc
->w_large_pages
= 1;
1333 wc
->w_large_pages
= 0;
1335 ocfs2_init_dealloc_ctxt(&wc
->w_dealloc
);
1343 * If a page has any new buffers, zero them out here, and mark them uptodate
1344 * and dirty so they'll be written out (in order to prevent uninitialised
1345 * block data from leaking). And clear the new bit.
1347 static void ocfs2_zero_new_buffers(struct page
*page
, unsigned from
, unsigned to
)
1349 unsigned int block_start
, block_end
;
1350 struct buffer_head
*head
, *bh
;
1352 BUG_ON(!PageLocked(page
));
1353 if (!page_has_buffers(page
))
1356 bh
= head
= page_buffers(page
);
1359 block_end
= block_start
+ bh
->b_size
;
1361 if (buffer_new(bh
)) {
1362 if (block_end
> from
&& block_start
< to
) {
1363 if (!PageUptodate(page
)) {
1364 unsigned start
, end
;
1366 start
= max(from
, block_start
);
1367 end
= min(to
, block_end
);
1369 zero_user_segment(page
, start
, end
);
1370 set_buffer_uptodate(bh
);
1373 clear_buffer_new(bh
);
1374 mark_buffer_dirty(bh
);
1378 block_start
= block_end
;
1379 bh
= bh
->b_this_page
;
1380 } while (bh
!= head
);
1384 * Only called when we have a failure during allocating write to write
1385 * zero's to the newly allocated region.
1387 static void ocfs2_write_failure(struct inode
*inode
,
1388 struct ocfs2_write_ctxt
*wc
,
1389 loff_t user_pos
, unsigned user_len
)
1392 unsigned from
= user_pos
& (PAGE_CACHE_SIZE
- 1),
1393 to
= user_pos
+ user_len
;
1394 struct page
*tmppage
;
1396 ocfs2_zero_new_buffers(wc
->w_target_page
, from
, to
);
1398 for(i
= 0; i
< wc
->w_num_pages
; i
++) {
1399 tmppage
= wc
->w_pages
[i
];
1401 if (page_has_buffers(tmppage
)) {
1402 if (ocfs2_should_order_data(inode
))
1403 ocfs2_jbd2_file_inode(wc
->w_handle
, inode
);
1405 block_commit_write(tmppage
, from
, to
);
1410 static int ocfs2_prepare_page_for_write(struct inode
*inode
, u64
*p_blkno
,
1411 struct ocfs2_write_ctxt
*wc
,
1412 struct page
*page
, u32 cpos
,
1413 loff_t user_pos
, unsigned user_len
,
1417 unsigned int map_from
= 0, map_to
= 0;
1418 unsigned int cluster_start
, cluster_end
;
1419 unsigned int user_data_from
= 0, user_data_to
= 0;
1421 ocfs2_figure_cluster_boundaries(OCFS2_SB(inode
->i_sb
), cpos
,
1422 &cluster_start
, &cluster_end
);
1424 /* treat the write as new if the a hole/lseek spanned across
1425 * the page boundary.
1427 new = new | ((i_size_read(inode
) <= page_offset(page
)) &&
1428 (page_offset(page
) <= user_pos
));
1430 if (page
== wc
->w_target_page
) {
1431 map_from
= user_pos
& (PAGE_CACHE_SIZE
- 1);
1432 map_to
= map_from
+ user_len
;
1435 ret
= ocfs2_map_page_blocks(page
, p_blkno
, inode
,
1436 cluster_start
, cluster_end
,
1439 ret
= ocfs2_map_page_blocks(page
, p_blkno
, inode
,
1440 map_from
, map_to
, new);
1446 user_data_from
= map_from
;
1447 user_data_to
= map_to
;
1449 map_from
= cluster_start
;
1450 map_to
= cluster_end
;
1454 * If we haven't allocated the new page yet, we
1455 * shouldn't be writing it out without copying user
1456 * data. This is likely a math error from the caller.
1460 map_from
= cluster_start
;
1461 map_to
= cluster_end
;
1463 ret
= ocfs2_map_page_blocks(page
, p_blkno
, inode
,
1464 cluster_start
, cluster_end
, new);
1472 * Parts of newly allocated pages need to be zero'd.
1474 * Above, we have also rewritten 'to' and 'from' - as far as
1475 * the rest of the function is concerned, the entire cluster
1476 * range inside of a page needs to be written.
1478 * We can skip this if the page is up to date - it's already
1479 * been zero'd from being read in as a hole.
1481 if (new && !PageUptodate(page
))
1482 ocfs2_clear_page_regions(page
, OCFS2_SB(inode
->i_sb
),
1483 cpos
, user_data_from
, user_data_to
);
1485 flush_dcache_page(page
);
1492 * This function will only grab one clusters worth of pages.
1494 static int ocfs2_grab_pages_for_write(struct address_space
*mapping
,
1495 struct ocfs2_write_ctxt
*wc
,
1496 u32 cpos
, loff_t user_pos
,
1497 unsigned user_len
, int new,
1498 struct page
*mmap_page
)
1501 unsigned long start
, target_index
, end_index
, index
;
1502 struct inode
*inode
= mapping
->host
;
1505 target_index
= user_pos
>> PAGE_CACHE_SHIFT
;
1508 * Figure out how many pages we'll be manipulating here. For
1509 * non allocating write, we just change the one
1510 * page. Otherwise, we'll need a whole clusters worth. If we're
1511 * writing past i_size, we only need enough pages to cover the
1512 * last page of the write.
1515 wc
->w_num_pages
= ocfs2_pages_per_cluster(inode
->i_sb
);
1516 start
= ocfs2_align_clusters_to_page_index(inode
->i_sb
, cpos
);
1518 * We need the index *past* the last page we could possibly
1519 * touch. This is the page past the end of the write or
1520 * i_size, whichever is greater.
1522 last_byte
= max(user_pos
+ user_len
, i_size_read(inode
));
1523 BUG_ON(last_byte
< 1);
1524 end_index
= ((last_byte
- 1) >> PAGE_CACHE_SHIFT
) + 1;
1525 if ((start
+ wc
->w_num_pages
) > end_index
)
1526 wc
->w_num_pages
= end_index
- start
;
1528 wc
->w_num_pages
= 1;
1529 start
= target_index
;
1532 for(i
= 0; i
< wc
->w_num_pages
; i
++) {
1535 if (index
== target_index
&& mmap_page
) {
1537 * ocfs2_pagemkwrite() is a little different
1538 * and wants us to directly use the page
1541 lock_page(mmap_page
);
1543 /* Exit and let the caller retry */
1544 if (mmap_page
->mapping
!= mapping
) {
1545 WARN_ON(mmap_page
->mapping
);
1546 unlock_page(mmap_page
);
1551 page_cache_get(mmap_page
);
1552 wc
->w_pages
[i
] = mmap_page
;
1553 wc
->w_target_locked
= true;
1555 wc
->w_pages
[i
] = find_or_create_page(mapping
, index
,
1557 if (!wc
->w_pages
[i
]) {
1563 wait_for_stable_page(wc
->w_pages
[i
]);
1565 if (index
== target_index
)
1566 wc
->w_target_page
= wc
->w_pages
[i
];
1570 wc
->w_target_locked
= false;
1575 * Prepare a single cluster for write one cluster into the file.
1577 static int ocfs2_write_cluster(struct address_space
*mapping
,
1578 u32 phys
, unsigned int unwritten
,
1579 unsigned int should_zero
,
1580 struct ocfs2_alloc_context
*data_ac
,
1581 struct ocfs2_alloc_context
*meta_ac
,
1582 struct ocfs2_write_ctxt
*wc
, u32 cpos
,
1583 loff_t user_pos
, unsigned user_len
)
1586 u64 v_blkno
, p_blkno
;
1587 struct inode
*inode
= mapping
->host
;
1588 struct ocfs2_extent_tree et
;
1590 new = phys
== 0 ? 1 : 0;
1595 * This is safe to call with the page locks - it won't take
1596 * any additional semaphores or cluster locks.
1599 ret
= ocfs2_add_inode_data(OCFS2_SB(inode
->i_sb
), inode
,
1600 &tmp_pos
, 1, 0, wc
->w_di_bh
,
1601 wc
->w_handle
, data_ac
,
1604 * This shouldn't happen because we must have already
1605 * calculated the correct meta data allocation required. The
1606 * internal tree allocation code should know how to increase
1607 * transaction credits itself.
1609 * If need be, we could handle -EAGAIN for a
1610 * RESTART_TRANS here.
1612 mlog_bug_on_msg(ret
== -EAGAIN
,
1613 "Inode %llu: EAGAIN return during allocation.\n",
1614 (unsigned long long)OCFS2_I(inode
)->ip_blkno
);
1619 } else if (unwritten
) {
1620 ocfs2_init_dinode_extent_tree(&et
, INODE_CACHE(inode
),
1622 ret
= ocfs2_mark_extent_written(inode
, &et
,
1623 wc
->w_handle
, cpos
, 1, phys
,
1624 meta_ac
, &wc
->w_dealloc
);
1632 v_blkno
= ocfs2_clusters_to_blocks(inode
->i_sb
, cpos
);
1634 v_blkno
= user_pos
>> inode
->i_sb
->s_blocksize_bits
;
1637 * The only reason this should fail is due to an inability to
1638 * find the extent added.
1640 ret
= ocfs2_extent_map_get_blocks(inode
, v_blkno
, &p_blkno
, NULL
,
1643 mlog(ML_ERROR
, "Get physical blkno failed for inode %llu, "
1644 "at logical block %llu",
1645 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
1646 (unsigned long long)v_blkno
);
1650 BUG_ON(p_blkno
== 0);
1652 for(i
= 0; i
< wc
->w_num_pages
; i
++) {
1655 tmpret
= ocfs2_prepare_page_for_write(inode
, &p_blkno
, wc
,
1656 wc
->w_pages
[i
], cpos
,
1667 * We only have cleanup to do in case of allocating write.
1670 ocfs2_write_failure(inode
, wc
, user_pos
, user_len
);
1677 static int ocfs2_write_cluster_by_desc(struct address_space
*mapping
,
1678 struct ocfs2_alloc_context
*data_ac
,
1679 struct ocfs2_alloc_context
*meta_ac
,
1680 struct ocfs2_write_ctxt
*wc
,
1681 loff_t pos
, unsigned len
)
1685 unsigned int local_len
= len
;
1686 struct ocfs2_write_cluster_desc
*desc
;
1687 struct ocfs2_super
*osb
= OCFS2_SB(mapping
->host
->i_sb
);
1689 for (i
= 0; i
< wc
->w_clen
; i
++) {
1690 desc
= &wc
->w_desc
[i
];
1693 * We have to make sure that the total write passed in
1694 * doesn't extend past a single cluster.
1697 cluster_off
= pos
& (osb
->s_clustersize
- 1);
1698 if ((cluster_off
+ local_len
) > osb
->s_clustersize
)
1699 local_len
= osb
->s_clustersize
- cluster_off
;
1701 ret
= ocfs2_write_cluster(mapping
, desc
->c_phys
,
1705 wc
, desc
->c_cpos
, pos
, local_len
);
1721 * ocfs2_write_end() wants to know which parts of the target page it
1722 * should complete the write on. It's easiest to compute them ahead of
1723 * time when a more complete view of the write is available.
1725 static void ocfs2_set_target_boundaries(struct ocfs2_super
*osb
,
1726 struct ocfs2_write_ctxt
*wc
,
1727 loff_t pos
, unsigned len
, int alloc
)
1729 struct ocfs2_write_cluster_desc
*desc
;
1731 wc
->w_target_from
= pos
& (PAGE_CACHE_SIZE
- 1);
1732 wc
->w_target_to
= wc
->w_target_from
+ len
;
1738 * Allocating write - we may have different boundaries based
1739 * on page size and cluster size.
1741 * NOTE: We can no longer compute one value from the other as
1742 * the actual write length and user provided length may be
1746 if (wc
->w_large_pages
) {
1748 * We only care about the 1st and last cluster within
1749 * our range and whether they should be zero'd or not. Either
1750 * value may be extended out to the start/end of a
1751 * newly allocated cluster.
1753 desc
= &wc
->w_desc
[0];
1754 if (desc
->c_needs_zero
)
1755 ocfs2_figure_cluster_boundaries(osb
,
1760 desc
= &wc
->w_desc
[wc
->w_clen
- 1];
1761 if (desc
->c_needs_zero
)
1762 ocfs2_figure_cluster_boundaries(osb
,
1767 wc
->w_target_from
= 0;
1768 wc
->w_target_to
= PAGE_CACHE_SIZE
;
1773 * Populate each single-cluster write descriptor in the write context
1774 * with information about the i/o to be done.
1776 * Returns the number of clusters that will have to be allocated, as
1777 * well as a worst case estimate of the number of extent records that
1778 * would have to be created during a write to an unwritten region.
1780 static int ocfs2_populate_write_desc(struct inode
*inode
,
1781 struct ocfs2_write_ctxt
*wc
,
1782 unsigned int *clusters_to_alloc
,
1783 unsigned int *extents_to_split
)
1786 struct ocfs2_write_cluster_desc
*desc
;
1787 unsigned int num_clusters
= 0;
1788 unsigned int ext_flags
= 0;
1792 *clusters_to_alloc
= 0;
1793 *extents_to_split
= 0;
1795 for (i
= 0; i
< wc
->w_clen
; i
++) {
1796 desc
= &wc
->w_desc
[i
];
1797 desc
->c_cpos
= wc
->w_cpos
+ i
;
1799 if (num_clusters
== 0) {
1801 * Need to look up the next extent record.
1803 ret
= ocfs2_get_clusters(inode
, desc
->c_cpos
, &phys
,
1804 &num_clusters
, &ext_flags
);
1810 /* We should already CoW the refcountd extent. */
1811 BUG_ON(ext_flags
& OCFS2_EXT_REFCOUNTED
);
1814 * Assume worst case - that we're writing in
1815 * the middle of the extent.
1817 * We can assume that the write proceeds from
1818 * left to right, in which case the extent
1819 * insert code is smart enough to coalesce the
1820 * next splits into the previous records created.
1822 if (ext_flags
& OCFS2_EXT_UNWRITTEN
)
1823 *extents_to_split
= *extents_to_split
+ 2;
1826 * Only increment phys if it doesn't describe
1833 * If w_first_new_cpos is < UINT_MAX, we have a non-sparse
1834 * file that got extended. w_first_new_cpos tells us
1835 * where the newly allocated clusters are so we can
1838 if (desc
->c_cpos
>= wc
->w_first_new_cpos
) {
1840 desc
->c_needs_zero
= 1;
1843 desc
->c_phys
= phys
;
1846 desc
->c_needs_zero
= 1;
1847 *clusters_to_alloc
= *clusters_to_alloc
+ 1;
1850 if (ext_flags
& OCFS2_EXT_UNWRITTEN
) {
1851 desc
->c_unwritten
= 1;
1852 desc
->c_needs_zero
= 1;
1863 static int ocfs2_write_begin_inline(struct address_space
*mapping
,
1864 struct inode
*inode
,
1865 struct ocfs2_write_ctxt
*wc
)
1868 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1871 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*)wc
->w_di_bh
->b_data
;
1873 handle
= ocfs2_start_trans(osb
, OCFS2_INODE_UPDATE_CREDITS
);
1874 if (IS_ERR(handle
)) {
1875 ret
= PTR_ERR(handle
);
1880 page
= find_or_create_page(mapping
, 0, GFP_NOFS
);
1882 ocfs2_commit_trans(osb
, handle
);
1888 * If we don't set w_num_pages then this page won't get unlocked
1889 * and freed on cleanup of the write context.
1891 wc
->w_pages
[0] = wc
->w_target_page
= page
;
1892 wc
->w_num_pages
= 1;
1894 ret
= ocfs2_journal_access_di(handle
, INODE_CACHE(inode
), wc
->w_di_bh
,
1895 OCFS2_JOURNAL_ACCESS_WRITE
);
1897 ocfs2_commit_trans(osb
, handle
);
1903 if (!(OCFS2_I(inode
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
))
1904 ocfs2_set_inode_data_inline(inode
, di
);
1906 if (!PageUptodate(page
)) {
1907 ret
= ocfs2_read_inline_data(inode
, page
, wc
->w_di_bh
);
1909 ocfs2_commit_trans(osb
, handle
);
1915 wc
->w_handle
= handle
;
1920 int ocfs2_size_fits_inline_data(struct buffer_head
*di_bh
, u64 new_size
)
1922 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*)di_bh
->b_data
;
1924 if (new_size
<= le16_to_cpu(di
->id2
.i_data
.id_count
))
1929 static int ocfs2_try_to_write_inline_data(struct address_space
*mapping
,
1930 struct inode
*inode
, loff_t pos
,
1931 unsigned len
, struct page
*mmap_page
,
1932 struct ocfs2_write_ctxt
*wc
)
1934 int ret
, written
= 0;
1935 loff_t end
= pos
+ len
;
1936 struct ocfs2_inode_info
*oi
= OCFS2_I(inode
);
1937 struct ocfs2_dinode
*di
= NULL
;
1939 trace_ocfs2_try_to_write_inline_data((unsigned long long)oi
->ip_blkno
,
1940 len
, (unsigned long long)pos
,
1941 oi
->ip_dyn_features
);
1944 * Handle inodes which already have inline data 1st.
1946 if (oi
->ip_dyn_features
& OCFS2_INLINE_DATA_FL
) {
1947 if (mmap_page
== NULL
&&
1948 ocfs2_size_fits_inline_data(wc
->w_di_bh
, end
))
1949 goto do_inline_write
;
1952 * The write won't fit - we have to give this inode an
1953 * inline extent list now.
1955 ret
= ocfs2_convert_inline_data_to_extents(inode
, wc
->w_di_bh
);
1962 * Check whether the inode can accept inline data.
1964 if (oi
->ip_clusters
!= 0 || i_size_read(inode
) != 0)
1968 * Check whether the write can fit.
1970 di
= (struct ocfs2_dinode
*)wc
->w_di_bh
->b_data
;
1972 end
> ocfs2_max_inline_data_with_xattr(inode
->i_sb
, di
))
1976 ret
= ocfs2_write_begin_inline(mapping
, inode
, wc
);
1983 * This signals to the caller that the data can be written
1988 return written
? written
: ret
;
1992 * This function only does anything for file systems which can't
1993 * handle sparse files.
1995 * What we want to do here is fill in any hole between the current end
1996 * of allocation and the end of our write. That way the rest of the
1997 * write path can treat it as an non-allocating write, which has no
1998 * special case code for sparse/nonsparse files.
2000 static int ocfs2_expand_nonsparse_inode(struct inode
*inode
,
2001 struct buffer_head
*di_bh
,
2002 loff_t pos
, unsigned len
,
2003 struct ocfs2_write_ctxt
*wc
)
2006 loff_t newsize
= pos
+ len
;
2008 BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode
->i_sb
)));
2010 if (newsize
<= i_size_read(inode
))
2013 ret
= ocfs2_extend_no_holes(inode
, di_bh
, newsize
, pos
);
2017 wc
->w_first_new_cpos
=
2018 ocfs2_clusters_for_bytes(inode
->i_sb
, i_size_read(inode
));
2023 static int ocfs2_zero_tail(struct inode
*inode
, struct buffer_head
*di_bh
,
2028 BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode
->i_sb
)));
2029 if (pos
> i_size_read(inode
))
2030 ret
= ocfs2_zero_extend(inode
, di_bh
, pos
);
2036 * Try to flush truncate logs if we can free enough clusters from it.
2037 * As for return value, "< 0" means error, "0" no space and "1" means
2038 * we have freed enough spaces and let the caller try to allocate again.
2040 static int ocfs2_try_to_free_truncate_log(struct ocfs2_super
*osb
,
2041 unsigned int needed
)
2045 unsigned int truncated_clusters
;
2047 mutex_lock(&osb
->osb_tl_inode
->i_mutex
);
2048 truncated_clusters
= osb
->truncated_clusters
;
2049 mutex_unlock(&osb
->osb_tl_inode
->i_mutex
);
2052 * Check whether we can succeed in allocating if we free
2055 if (truncated_clusters
< needed
)
2058 ret
= ocfs2_flush_truncate_log(osb
);
2064 if (jbd2_journal_start_commit(osb
->journal
->j_journal
, &target
)) {
2065 jbd2_log_wait_commit(osb
->journal
->j_journal
, target
);
2072 int ocfs2_write_begin_nolock(struct file
*filp
,
2073 struct address_space
*mapping
,
2074 loff_t pos
, unsigned len
, unsigned flags
,
2075 struct page
**pagep
, void **fsdata
,
2076 struct buffer_head
*di_bh
, struct page
*mmap_page
)
2078 int ret
, cluster_of_pages
, credits
= OCFS2_INODE_UPDATE_CREDITS
;
2079 unsigned int clusters_to_alloc
, extents_to_split
, clusters_need
= 0;
2080 struct ocfs2_write_ctxt
*wc
;
2081 struct inode
*inode
= mapping
->host
;
2082 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
2083 struct ocfs2_dinode
*di
;
2084 struct ocfs2_alloc_context
*data_ac
= NULL
;
2085 struct ocfs2_alloc_context
*meta_ac
= NULL
;
2087 struct ocfs2_extent_tree et
;
2088 int try_free
= 1, ret1
;
2091 ret
= ocfs2_alloc_write_ctxt(&wc
, osb
, pos
, len
, di_bh
);
2097 if (ocfs2_supports_inline_data(osb
)) {
2098 ret
= ocfs2_try_to_write_inline_data(mapping
, inode
, pos
, len
,
2110 if (ocfs2_sparse_alloc(osb
))
2111 ret
= ocfs2_zero_tail(inode
, di_bh
, pos
);
2113 ret
= ocfs2_expand_nonsparse_inode(inode
, di_bh
, pos
, len
,
2120 ret
= ocfs2_check_range_for_refcount(inode
, pos
, len
);
2124 } else if (ret
== 1) {
2125 clusters_need
= wc
->w_clen
;
2126 ret
= ocfs2_refcount_cow(inode
, di_bh
,
2127 wc
->w_cpos
, wc
->w_clen
, UINT_MAX
);
2134 ret
= ocfs2_populate_write_desc(inode
, wc
, &clusters_to_alloc
,
2140 clusters_need
+= clusters_to_alloc
;
2142 di
= (struct ocfs2_dinode
*)wc
->w_di_bh
->b_data
;
2144 trace_ocfs2_write_begin_nolock(
2145 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
2146 (long long)i_size_read(inode
),
2147 le32_to_cpu(di
->i_clusters
),
2148 pos
, len
, flags
, mmap_page
,
2149 clusters_to_alloc
, extents_to_split
);
2152 * We set w_target_from, w_target_to here so that
2153 * ocfs2_write_end() knows which range in the target page to
2154 * write out. An allocation requires that we write the entire
2157 if (clusters_to_alloc
|| extents_to_split
) {
2159 * XXX: We are stretching the limits of
2160 * ocfs2_lock_allocators(). It greatly over-estimates
2161 * the work to be done.
2163 ocfs2_init_dinode_extent_tree(&et
, INODE_CACHE(inode
),
2165 ret
= ocfs2_lock_allocators(inode
, &et
,
2166 clusters_to_alloc
, extents_to_split
,
2167 &data_ac
, &meta_ac
);
2174 data_ac
->ac_resv
= &OCFS2_I(inode
)->ip_la_data_resv
;
2176 credits
= ocfs2_calc_extend_credits(inode
->i_sb
,
2182 * We have to zero sparse allocated clusters, unwritten extent clusters,
2183 * and non-sparse clusters we just extended. For non-sparse writes,
2184 * we know zeros will only be needed in the first and/or last cluster.
2186 if (clusters_to_alloc
|| extents_to_split
||
2187 (wc
->w_clen
&& (wc
->w_desc
[0].c_needs_zero
||
2188 wc
->w_desc
[wc
->w_clen
- 1].c_needs_zero
)))
2189 cluster_of_pages
= 1;
2191 cluster_of_pages
= 0;
2193 ocfs2_set_target_boundaries(osb
, wc
, pos
, len
, cluster_of_pages
);
2195 handle
= ocfs2_start_trans(osb
, credits
);
2196 if (IS_ERR(handle
)) {
2197 ret
= PTR_ERR(handle
);
2202 wc
->w_handle
= handle
;
2204 if (clusters_to_alloc
) {
2205 ret
= dquot_alloc_space_nodirty(inode
,
2206 ocfs2_clusters_to_bytes(osb
->sb
, clusters_to_alloc
));
2211 * We don't want this to fail in ocfs2_write_end(), so do it
2214 ret
= ocfs2_journal_access_di(handle
, INODE_CACHE(inode
), wc
->w_di_bh
,
2215 OCFS2_JOURNAL_ACCESS_WRITE
);
2222 * Fill our page array first. That way we've grabbed enough so
2223 * that we can zero and flush if we error after adding the
2226 ret
= ocfs2_grab_pages_for_write(mapping
, wc
, wc
->w_cpos
, pos
, len
,
2227 cluster_of_pages
, mmap_page
);
2228 if (ret
&& ret
!= -EAGAIN
) {
2234 * ocfs2_grab_pages_for_write() returns -EAGAIN if it could not lock
2235 * the target page. In this case, we exit with no error and no target
2236 * page. This will trigger the caller, page_mkwrite(), to re-try
2239 if (ret
== -EAGAIN
) {
2240 BUG_ON(wc
->w_target_page
);
2245 ret
= ocfs2_write_cluster_by_desc(mapping
, data_ac
, meta_ac
, wc
, pos
,
2253 ocfs2_free_alloc_context(data_ac
);
2255 ocfs2_free_alloc_context(meta_ac
);
2258 *pagep
= wc
->w_target_page
;
2262 if (clusters_to_alloc
)
2263 dquot_free_space(inode
,
2264 ocfs2_clusters_to_bytes(osb
->sb
, clusters_to_alloc
));
2266 ocfs2_commit_trans(osb
, handle
);
2269 ocfs2_free_write_ctxt(wc
);
2272 ocfs2_free_alloc_context(data_ac
);
2276 ocfs2_free_alloc_context(meta_ac
);
2280 if (ret
== -ENOSPC
&& try_free
) {
2282 * Try to free some truncate log so that we can have enough
2283 * clusters to allocate.
2287 ret1
= ocfs2_try_to_free_truncate_log(osb
, clusters_need
);
2298 static int ocfs2_write_begin(struct file
*file
, struct address_space
*mapping
,
2299 loff_t pos
, unsigned len
, unsigned flags
,
2300 struct page
**pagep
, void **fsdata
)
2303 struct buffer_head
*di_bh
= NULL
;
2304 struct inode
*inode
= mapping
->host
;
2306 ret
= ocfs2_inode_lock(inode
, &di_bh
, 1);
2313 * Take alloc sem here to prevent concurrent lookups. That way
2314 * the mapping, zeroing and tree manipulation within
2315 * ocfs2_write() will be safe against ->readpage(). This
2316 * should also serve to lock out allocation from a shared
2319 down_write(&OCFS2_I(inode
)->ip_alloc_sem
);
2321 ret
= ocfs2_write_begin_nolock(file
, mapping
, pos
, len
, flags
, pagep
,
2322 fsdata
, di_bh
, NULL
);
2333 up_write(&OCFS2_I(inode
)->ip_alloc_sem
);
2336 ocfs2_inode_unlock(inode
, 1);
2341 static void ocfs2_write_end_inline(struct inode
*inode
, loff_t pos
,
2342 unsigned len
, unsigned *copied
,
2343 struct ocfs2_dinode
*di
,
2344 struct ocfs2_write_ctxt
*wc
)
2348 if (unlikely(*copied
< len
)) {
2349 if (!PageUptodate(wc
->w_target_page
)) {
2355 kaddr
= kmap_atomic(wc
->w_target_page
);
2356 memcpy(di
->id2
.i_data
.id_data
+ pos
, kaddr
+ pos
, *copied
);
2357 kunmap_atomic(kaddr
);
2359 trace_ocfs2_write_end_inline(
2360 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
2361 (unsigned long long)pos
, *copied
,
2362 le16_to_cpu(di
->id2
.i_data
.id_count
),
2363 le16_to_cpu(di
->i_dyn_features
));
2366 int ocfs2_write_end_nolock(struct address_space
*mapping
,
2367 loff_t pos
, unsigned len
, unsigned copied
,
2368 struct page
*page
, void *fsdata
)
2371 unsigned from
, to
, start
= pos
& (PAGE_CACHE_SIZE
- 1);
2372 struct inode
*inode
= mapping
->host
;
2373 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
2374 struct ocfs2_write_ctxt
*wc
= fsdata
;
2375 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*)wc
->w_di_bh
->b_data
;
2376 handle_t
*handle
= wc
->w_handle
;
2377 struct page
*tmppage
;
2379 if (OCFS2_I(inode
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
) {
2380 ocfs2_write_end_inline(inode
, pos
, len
, &copied
, di
, wc
);
2381 goto out_write_size
;
2384 if (unlikely(copied
< len
)) {
2385 if (!PageUptodate(wc
->w_target_page
))
2388 ocfs2_zero_new_buffers(wc
->w_target_page
, start
+copied
,
2391 flush_dcache_page(wc
->w_target_page
);
2393 for(i
= 0; i
< wc
->w_num_pages
; i
++) {
2394 tmppage
= wc
->w_pages
[i
];
2396 if (tmppage
== wc
->w_target_page
) {
2397 from
= wc
->w_target_from
;
2398 to
= wc
->w_target_to
;
2400 BUG_ON(from
> PAGE_CACHE_SIZE
||
2401 to
> PAGE_CACHE_SIZE
||
2405 * Pages adjacent to the target (if any) imply
2406 * a hole-filling write in which case we want
2407 * to flush their entire range.
2410 to
= PAGE_CACHE_SIZE
;
2413 if (page_has_buffers(tmppage
)) {
2414 if (ocfs2_should_order_data(inode
))
2415 ocfs2_jbd2_file_inode(wc
->w_handle
, inode
);
2416 block_commit_write(tmppage
, from
, to
);
2422 if (pos
> i_size_read(inode
)) {
2423 i_size_write(inode
, pos
);
2424 mark_inode_dirty(inode
);
2426 inode
->i_blocks
= ocfs2_inode_sector_count(inode
);
2427 di
->i_size
= cpu_to_le64((u64
)i_size_read(inode
));
2428 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
2429 di
->i_mtime
= di
->i_ctime
= cpu_to_le64(inode
->i_mtime
.tv_sec
);
2430 di
->i_mtime_nsec
= di
->i_ctime_nsec
= cpu_to_le32(inode
->i_mtime
.tv_nsec
);
2431 ocfs2_update_inode_fsync_trans(handle
, inode
, 1);
2432 ocfs2_journal_dirty(handle
, wc
->w_di_bh
);
2434 /* unlock pages before dealloc since it needs acquiring j_trans_barrier
2435 * lock, or it will cause a deadlock since journal commit threads holds
2436 * this lock and will ask for the page lock when flushing the data.
2437 * put it here to preserve the unlock order.
2439 ocfs2_unlock_pages(wc
);
2441 ocfs2_commit_trans(osb
, handle
);
2443 ocfs2_run_deallocs(osb
, &wc
->w_dealloc
);
2445 brelse(wc
->w_di_bh
);
2451 static int ocfs2_write_end(struct file
*file
, struct address_space
*mapping
,
2452 loff_t pos
, unsigned len
, unsigned copied
,
2453 struct page
*page
, void *fsdata
)
2456 struct inode
*inode
= mapping
->host
;
2458 ret
= ocfs2_write_end_nolock(mapping
, pos
, len
, copied
, page
, fsdata
);
2460 up_write(&OCFS2_I(inode
)->ip_alloc_sem
);
2461 ocfs2_inode_unlock(inode
, 1);
2466 const struct address_space_operations ocfs2_aops
= {
2467 .readpage
= ocfs2_readpage
,
2468 .readpages
= ocfs2_readpages
,
2469 .writepage
= ocfs2_writepage
,
2470 .write_begin
= ocfs2_write_begin
,
2471 .write_end
= ocfs2_write_end
,
2473 .direct_IO
= ocfs2_direct_IO
,
2474 .invalidatepage
= block_invalidatepage
,
2475 .releasepage
= ocfs2_releasepage
,
2476 .migratepage
= buffer_migrate_page
,
2477 .is_partially_uptodate
= block_is_partially_uptodate
,
2478 .error_remove_page
= generic_error_remove_page
,