2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/bio.h>
20 #include <linux/slab.h>
21 #include <linux/pagemap.h>
22 #include <linux/highmem.h>
25 #include "transaction.h"
27 #include "print-tree.h"
28 #include "compression.h"
30 #define __MAX_CSUM_ITEMS(r, size) \
31 ((unsigned long)(((BTRFS_MAX_ITEM_SIZE(r) * 2) / size) - 1))
33 #define MAX_CSUM_ITEMS(r, size) (min_t(u32, __MAX_CSUM_ITEMS(r, size), \
36 #define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \
37 sizeof(struct btrfs_ordered_sum)) / \
38 sizeof(u32) * (r)->sectorsize)
40 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
41 struct btrfs_root
*root
,
42 u64 objectid
, u64 pos
,
43 u64 disk_offset
, u64 disk_num_bytes
,
44 u64 num_bytes
, u64 offset
, u64 ram_bytes
,
45 u8 compression
, u8 encryption
, u16 other_encoding
)
48 struct btrfs_file_extent_item
*item
;
49 struct btrfs_key file_key
;
50 struct btrfs_path
*path
;
51 struct extent_buffer
*leaf
;
53 path
= btrfs_alloc_path();
56 file_key
.objectid
= objectid
;
57 file_key
.offset
= pos
;
58 file_key
.type
= BTRFS_EXTENT_DATA_KEY
;
60 path
->leave_spinning
= 1;
61 ret
= btrfs_insert_empty_item(trans
, root
, path
, &file_key
,
65 BUG_ON(ret
); /* Can't happen */
66 leaf
= path
->nodes
[0];
67 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
68 struct btrfs_file_extent_item
);
69 btrfs_set_file_extent_disk_bytenr(leaf
, item
, disk_offset
);
70 btrfs_set_file_extent_disk_num_bytes(leaf
, item
, disk_num_bytes
);
71 btrfs_set_file_extent_offset(leaf
, item
, offset
);
72 btrfs_set_file_extent_num_bytes(leaf
, item
, num_bytes
);
73 btrfs_set_file_extent_ram_bytes(leaf
, item
, ram_bytes
);
74 btrfs_set_file_extent_generation(leaf
, item
, trans
->transid
);
75 btrfs_set_file_extent_type(leaf
, item
, BTRFS_FILE_EXTENT_REG
);
76 btrfs_set_file_extent_compression(leaf
, item
, compression
);
77 btrfs_set_file_extent_encryption(leaf
, item
, encryption
);
78 btrfs_set_file_extent_other_encoding(leaf
, item
, other_encoding
);
80 btrfs_mark_buffer_dirty(leaf
);
82 btrfs_free_path(path
);
86 static struct btrfs_csum_item
*
87 btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
88 struct btrfs_root
*root
,
89 struct btrfs_path
*path
,
93 struct btrfs_key file_key
;
94 struct btrfs_key found_key
;
95 struct btrfs_csum_item
*item
;
96 struct extent_buffer
*leaf
;
98 u16 csum_size
= btrfs_super_csum_size(root
->fs_info
->super_copy
);
101 file_key
.objectid
= BTRFS_EXTENT_CSUM_OBJECTID
;
102 file_key
.offset
= bytenr
;
103 file_key
.type
= BTRFS_EXTENT_CSUM_KEY
;
104 ret
= btrfs_search_slot(trans
, root
, &file_key
, path
, 0, cow
);
107 leaf
= path
->nodes
[0];
110 if (path
->slots
[0] == 0)
113 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
114 if (found_key
.type
!= BTRFS_EXTENT_CSUM_KEY
)
117 csum_offset
= (bytenr
- found_key
.offset
) >>
118 root
->fs_info
->sb
->s_blocksize_bits
;
119 csums_in_item
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
120 csums_in_item
/= csum_size
;
122 if (csum_offset
== csums_in_item
) {
125 } else if (csum_offset
> csums_in_item
) {
129 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_csum_item
);
130 item
= (struct btrfs_csum_item
*)((unsigned char *)item
+
131 csum_offset
* csum_size
);
139 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
140 struct btrfs_root
*root
,
141 struct btrfs_path
*path
, u64 objectid
,
145 struct btrfs_key file_key
;
146 int ins_len
= mod
< 0 ? -1 : 0;
149 file_key
.objectid
= objectid
;
150 file_key
.offset
= offset
;
151 file_key
.type
= BTRFS_EXTENT_DATA_KEY
;
152 ret
= btrfs_search_slot(trans
, root
, &file_key
, path
, ins_len
, cow
);
156 static void btrfs_io_bio_endio_readpage(struct btrfs_io_bio
*bio
, int err
)
158 kfree(bio
->csum_allocated
);
161 static int __btrfs_lookup_bio_sums(struct btrfs_root
*root
,
162 struct inode
*inode
, struct bio
*bio
,
163 u64 logical_offset
, u32
*dst
, int dio
)
165 struct bio_vec
*bvec
= bio
->bi_io_vec
;
166 struct btrfs_io_bio
*btrfs_bio
= btrfs_io_bio(bio
);
167 struct btrfs_csum_item
*item
= NULL
;
168 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
169 struct btrfs_path
*path
;
172 u64 item_start_offset
= 0;
173 u64 item_last_offset
= 0;
180 u16 csum_size
= btrfs_super_csum_size(root
->fs_info
->super_copy
);
182 path
= btrfs_alloc_path();
186 nblocks
= bio
->bi_iter
.bi_size
>> inode
->i_sb
->s_blocksize_bits
;
188 if (nblocks
* csum_size
> BTRFS_BIO_INLINE_CSUM_SIZE
) {
189 btrfs_bio
->csum_allocated
= kmalloc_array(nblocks
,
190 csum_size
, GFP_NOFS
);
191 if (!btrfs_bio
->csum_allocated
) {
192 btrfs_free_path(path
);
195 btrfs_bio
->csum
= btrfs_bio
->csum_allocated
;
196 btrfs_bio
->end_io
= btrfs_io_bio_endio_readpage
;
198 btrfs_bio
->csum
= btrfs_bio
->csum_inline
;
200 csum
= btrfs_bio
->csum
;
205 if (bio
->bi_iter
.bi_size
> PAGE_SIZE
* 8)
206 path
->reada
= READA_FORWARD
;
208 WARN_ON(bio
->bi_vcnt
<= 0);
211 * the free space stuff is only read when it hasn't been
212 * updated in the current transaction. So, we can safely
213 * read from the commit root and sidestep a nasty deadlock
214 * between reading the free space cache and updating the csum tree.
216 if (btrfs_is_free_space_inode(inode
)) {
217 path
->search_commit_root
= 1;
218 path
->skip_locking
= 1;
221 disk_bytenr
= (u64
)bio
->bi_iter
.bi_sector
<< 9;
223 offset
= logical_offset
;
225 page_bytes_left
= bvec
->bv_len
;
226 while (bio_index
< bio
->bi_vcnt
) {
228 offset
= page_offset(bvec
->bv_page
) + bvec
->bv_offset
;
229 count
= btrfs_find_ordered_sum(inode
, offset
, disk_bytenr
,
230 (u32
*)csum
, nblocks
);
234 if (!item
|| disk_bytenr
< item_start_offset
||
235 disk_bytenr
>= item_last_offset
) {
236 struct btrfs_key found_key
;
240 btrfs_release_path(path
);
241 item
= btrfs_lookup_csum(NULL
, root
->fs_info
->csum_root
,
242 path
, disk_bytenr
, 0);
245 memset(csum
, 0, csum_size
);
246 if (BTRFS_I(inode
)->root
->root_key
.objectid
==
247 BTRFS_DATA_RELOC_TREE_OBJECTID
) {
248 set_extent_bits(io_tree
, offset
,
249 offset
+ root
->sectorsize
- 1,
252 btrfs_info_rl(BTRFS_I(inode
)->root
->fs_info
,
253 "no csum found for inode %llu start %llu",
254 btrfs_ino(inode
), offset
);
257 btrfs_release_path(path
);
260 btrfs_item_key_to_cpu(path
->nodes
[0], &found_key
,
263 item_start_offset
= found_key
.offset
;
264 item_size
= btrfs_item_size_nr(path
->nodes
[0],
266 item_last_offset
= item_start_offset
+
267 (item_size
/ csum_size
) *
269 item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
270 struct btrfs_csum_item
);
273 * this byte range must be able to fit inside
274 * a single leaf so it will also fit inside a u32
276 diff
= disk_bytenr
- item_start_offset
;
277 diff
= diff
/ root
->sectorsize
;
278 diff
= diff
* csum_size
;
279 count
= min_t(int, nblocks
, (item_last_offset
- disk_bytenr
) >>
280 inode
->i_sb
->s_blocksize_bits
);
281 read_extent_buffer(path
->nodes
[0], csum
,
282 ((unsigned long)item
) + diff
,
285 csum
+= count
* csum_size
;
289 disk_bytenr
+= root
->sectorsize
;
290 offset
+= root
->sectorsize
;
291 page_bytes_left
-= root
->sectorsize
;
292 if (!page_bytes_left
) {
295 * make sure we're still inside the
296 * bio before we update page_bytes_left
298 if (bio_index
>= bio
->bi_vcnt
) {
303 page_bytes_left
= bvec
->bv_len
;
310 btrfs_free_path(path
);
314 int btrfs_lookup_bio_sums(struct btrfs_root
*root
, struct inode
*inode
,
315 struct bio
*bio
, u32
*dst
)
317 return __btrfs_lookup_bio_sums(root
, inode
, bio
, 0, dst
, 0);
320 int btrfs_lookup_bio_sums_dio(struct btrfs_root
*root
, struct inode
*inode
,
321 struct bio
*bio
, u64 offset
)
323 return __btrfs_lookup_bio_sums(root
, inode
, bio
, offset
, NULL
, 1);
326 int btrfs_lookup_csums_range(struct btrfs_root
*root
, u64 start
, u64 end
,
327 struct list_head
*list
, int search_commit
)
329 struct btrfs_key key
;
330 struct btrfs_path
*path
;
331 struct extent_buffer
*leaf
;
332 struct btrfs_ordered_sum
*sums
;
333 struct btrfs_csum_item
*item
;
335 unsigned long offset
;
339 u16 csum_size
= btrfs_super_csum_size(root
->fs_info
->super_copy
);
341 ASSERT(IS_ALIGNED(start
, root
->sectorsize
) &&
342 IS_ALIGNED(end
+ 1, root
->sectorsize
));
344 path
= btrfs_alloc_path();
349 path
->skip_locking
= 1;
350 path
->reada
= READA_FORWARD
;
351 path
->search_commit_root
= 1;
354 key
.objectid
= BTRFS_EXTENT_CSUM_OBJECTID
;
356 key
.type
= BTRFS_EXTENT_CSUM_KEY
;
358 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
361 if (ret
> 0 && path
->slots
[0] > 0) {
362 leaf
= path
->nodes
[0];
363 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0] - 1);
364 if (key
.objectid
== BTRFS_EXTENT_CSUM_OBJECTID
&&
365 key
.type
== BTRFS_EXTENT_CSUM_KEY
) {
366 offset
= (start
- key
.offset
) >>
367 root
->fs_info
->sb
->s_blocksize_bits
;
368 if (offset
* csum_size
<
369 btrfs_item_size_nr(leaf
, path
->slots
[0] - 1))
374 while (start
<= end
) {
375 leaf
= path
->nodes
[0];
376 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
377 ret
= btrfs_next_leaf(root
, path
);
382 leaf
= path
->nodes
[0];
385 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
386 if (key
.objectid
!= BTRFS_EXTENT_CSUM_OBJECTID
||
387 key
.type
!= BTRFS_EXTENT_CSUM_KEY
||
391 if (key
.offset
> start
)
394 size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
395 csum_end
= key
.offset
+ (size
/ csum_size
) * root
->sectorsize
;
396 if (csum_end
<= start
) {
401 csum_end
= min(csum_end
, end
+ 1);
402 item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
403 struct btrfs_csum_item
);
404 while (start
< csum_end
) {
405 size
= min_t(size_t, csum_end
- start
,
406 MAX_ORDERED_SUM_BYTES(root
));
407 sums
= kzalloc(btrfs_ordered_sum_size(root
, size
),
414 sums
->bytenr
= start
;
415 sums
->len
= (int)size
;
417 offset
= (start
- key
.offset
) >>
418 root
->fs_info
->sb
->s_blocksize_bits
;
420 size
>>= root
->fs_info
->sb
->s_blocksize_bits
;
422 read_extent_buffer(path
->nodes
[0],
424 ((unsigned long)item
) + offset
,
427 start
+= root
->sectorsize
* size
;
428 list_add_tail(&sums
->list
, &tmplist
);
434 while (ret
< 0 && !list_empty(&tmplist
)) {
435 sums
= list_entry(tmplist
.next
, struct btrfs_ordered_sum
, list
);
436 list_del(&sums
->list
);
439 list_splice_tail(&tmplist
, list
);
441 btrfs_free_path(path
);
445 int btrfs_csum_one_bio(struct btrfs_root
*root
, struct inode
*inode
,
446 struct bio
*bio
, u64 file_start
, int contig
)
448 struct btrfs_ordered_sum
*sums
;
449 struct btrfs_ordered_extent
*ordered
;
451 struct bio_vec
*bvec
= bio
->bi_io_vec
;
456 unsigned long total_bytes
= 0;
457 unsigned long this_sum_bytes
= 0;
460 WARN_ON(bio
->bi_vcnt
<= 0);
461 sums
= kzalloc(btrfs_ordered_sum_size(root
, bio
->bi_iter
.bi_size
),
466 sums
->len
= bio
->bi_iter
.bi_size
;
467 INIT_LIST_HEAD(&sums
->list
);
472 offset
= page_offset(bvec
->bv_page
) + bvec
->bv_offset
;
474 ordered
= btrfs_lookup_ordered_extent(inode
, offset
);
475 BUG_ON(!ordered
); /* Logic error */
476 sums
->bytenr
= (u64
)bio
->bi_iter
.bi_sector
<< 9;
479 while (bio_index
< bio
->bi_vcnt
) {
481 offset
= page_offset(bvec
->bv_page
) + bvec
->bv_offset
;
483 data
= kmap_atomic(bvec
->bv_page
);
485 nr_sectors
= BTRFS_BYTES_TO_BLKS(root
->fs_info
,
486 bvec
->bv_len
+ root
->sectorsize
489 for (i
= 0; i
< nr_sectors
; i
++) {
490 if (offset
>= ordered
->file_offset
+ ordered
->len
||
491 offset
< ordered
->file_offset
) {
492 unsigned long bytes_left
;
495 sums
->len
= this_sum_bytes
;
497 btrfs_add_ordered_sum(inode
, ordered
, sums
);
498 btrfs_put_ordered_extent(ordered
);
500 bytes_left
= bio
->bi_iter
.bi_size
- total_bytes
;
502 sums
= kzalloc(btrfs_ordered_sum_size(root
, bytes_left
),
504 BUG_ON(!sums
); /* -ENOMEM */
505 sums
->len
= bytes_left
;
506 ordered
= btrfs_lookup_ordered_extent(inode
,
508 ASSERT(ordered
); /* Logic error */
509 sums
->bytenr
= ((u64
)bio
->bi_iter
.bi_sector
<< 9)
513 data
= kmap_atomic(bvec
->bv_page
);
516 sums
->sums
[index
] = ~(u32
)0;
518 = btrfs_csum_data(data
+ bvec
->bv_offset
519 + (i
* root
->sectorsize
),
522 btrfs_csum_final(sums
->sums
[index
],
523 (char *)(sums
->sums
+ index
));
525 offset
+= root
->sectorsize
;
526 this_sum_bytes
+= root
->sectorsize
;
527 total_bytes
+= root
->sectorsize
;
536 btrfs_add_ordered_sum(inode
, ordered
, sums
);
537 btrfs_put_ordered_extent(ordered
);
542 * helper function for csum removal, this expects the
543 * key to describe the csum pointed to by the path, and it expects
544 * the csum to overlap the range [bytenr, len]
546 * The csum should not be entirely contained in the range and the
547 * range should not be entirely contained in the csum.
549 * This calls btrfs_truncate_item with the correct args based on the
550 * overlap, and fixes up the key as required.
552 static noinline
void truncate_one_csum(struct btrfs_root
*root
,
553 struct btrfs_path
*path
,
554 struct btrfs_key
*key
,
557 struct extent_buffer
*leaf
;
558 u16 csum_size
= btrfs_super_csum_size(root
->fs_info
->super_copy
);
560 u64 end_byte
= bytenr
+ len
;
561 u32 blocksize_bits
= root
->fs_info
->sb
->s_blocksize_bits
;
563 leaf
= path
->nodes
[0];
564 csum_end
= btrfs_item_size_nr(leaf
, path
->slots
[0]) / csum_size
;
565 csum_end
<<= root
->fs_info
->sb
->s_blocksize_bits
;
566 csum_end
+= key
->offset
;
568 if (key
->offset
< bytenr
&& csum_end
<= end_byte
) {
573 * A simple truncate off the end of the item
575 u32 new_size
= (bytenr
- key
->offset
) >> blocksize_bits
;
576 new_size
*= csum_size
;
577 btrfs_truncate_item(root
, path
, new_size
, 1);
578 } else if (key
->offset
>= bytenr
&& csum_end
> end_byte
&&
579 end_byte
> key
->offset
) {
584 * we need to truncate from the beginning of the csum
586 u32 new_size
= (csum_end
- end_byte
) >> blocksize_bits
;
587 new_size
*= csum_size
;
589 btrfs_truncate_item(root
, path
, new_size
, 0);
591 key
->offset
= end_byte
;
592 btrfs_set_item_key_safe(root
->fs_info
, path
, key
);
599 * deletes the csum items from the csum tree for a given
602 int btrfs_del_csums(struct btrfs_trans_handle
*trans
,
603 struct btrfs_root
*root
, u64 bytenr
, u64 len
)
605 struct btrfs_path
*path
;
606 struct btrfs_key key
;
607 u64 end_byte
= bytenr
+ len
;
609 struct extent_buffer
*leaf
;
611 u16 csum_size
= btrfs_super_csum_size(root
->fs_info
->super_copy
);
612 int blocksize_bits
= root
->fs_info
->sb
->s_blocksize_bits
;
614 root
= root
->fs_info
->csum_root
;
616 path
= btrfs_alloc_path();
621 key
.objectid
= BTRFS_EXTENT_CSUM_OBJECTID
;
622 key
.offset
= end_byte
- 1;
623 key
.type
= BTRFS_EXTENT_CSUM_KEY
;
625 path
->leave_spinning
= 1;
626 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
628 if (path
->slots
[0] == 0)
631 } else if (ret
< 0) {
635 leaf
= path
->nodes
[0];
636 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
638 if (key
.objectid
!= BTRFS_EXTENT_CSUM_OBJECTID
||
639 key
.type
!= BTRFS_EXTENT_CSUM_KEY
) {
643 if (key
.offset
>= end_byte
)
646 csum_end
= btrfs_item_size_nr(leaf
, path
->slots
[0]) / csum_size
;
647 csum_end
<<= blocksize_bits
;
648 csum_end
+= key
.offset
;
650 /* this csum ends before we start, we're done */
651 if (csum_end
<= bytenr
)
654 /* delete the entire item, it is inside our range */
655 if (key
.offset
>= bytenr
&& csum_end
<= end_byte
) {
656 ret
= btrfs_del_item(trans
, root
, path
);
659 if (key
.offset
== bytenr
)
661 } else if (key
.offset
< bytenr
&& csum_end
> end_byte
) {
662 unsigned long offset
;
663 unsigned long shift_len
;
664 unsigned long item_offset
;
669 * Our bytes are in the middle of the csum,
670 * we need to split this item and insert a new one.
672 * But we can't drop the path because the
673 * csum could change, get removed, extended etc.
675 * The trick here is the max size of a csum item leaves
676 * enough room in the tree block for a single
677 * item header. So, we split the item in place,
678 * adding a new header pointing to the existing
679 * bytes. Then we loop around again and we have
680 * a nicely formed csum item that we can neatly
683 offset
= (bytenr
- key
.offset
) >> blocksize_bits
;
686 shift_len
= (len
>> blocksize_bits
) * csum_size
;
688 item_offset
= btrfs_item_ptr_offset(leaf
,
691 memset_extent_buffer(leaf
, 0, item_offset
+ offset
,
696 * btrfs_split_item returns -EAGAIN when the
697 * item changed size or key
699 ret
= btrfs_split_item(trans
, root
, path
, &key
, offset
);
700 if (ret
&& ret
!= -EAGAIN
) {
701 btrfs_abort_transaction(trans
, ret
);
705 key
.offset
= end_byte
- 1;
707 truncate_one_csum(root
, path
, &key
, bytenr
, len
);
708 if (key
.offset
< bytenr
)
711 btrfs_release_path(path
);
715 btrfs_free_path(path
);
719 int btrfs_csum_file_blocks(struct btrfs_trans_handle
*trans
,
720 struct btrfs_root
*root
,
721 struct btrfs_ordered_sum
*sums
)
723 struct btrfs_key file_key
;
724 struct btrfs_key found_key
;
725 struct btrfs_path
*path
;
726 struct btrfs_csum_item
*item
;
727 struct btrfs_csum_item
*item_end
;
728 struct extent_buffer
*leaf
= NULL
;
738 u16 csum_size
= btrfs_super_csum_size(root
->fs_info
->super_copy
);
740 path
= btrfs_alloc_path();
744 next_offset
= (u64
)-1;
746 bytenr
= sums
->bytenr
+ total_bytes
;
747 file_key
.objectid
= BTRFS_EXTENT_CSUM_OBJECTID
;
748 file_key
.offset
= bytenr
;
749 file_key
.type
= BTRFS_EXTENT_CSUM_KEY
;
751 item
= btrfs_lookup_csum(trans
, root
, path
, bytenr
, 1);
754 leaf
= path
->nodes
[0];
755 item_end
= btrfs_item_ptr(leaf
, path
->slots
[0],
756 struct btrfs_csum_item
);
757 item_end
= (struct btrfs_csum_item
*)((char *)item_end
+
758 btrfs_item_size_nr(leaf
, path
->slots
[0]));
762 if (ret
!= -EFBIG
&& ret
!= -ENOENT
)
767 /* we found one, but it isn't big enough yet */
768 leaf
= path
->nodes
[0];
769 item_size
= btrfs_item_size_nr(leaf
, path
->slots
[0]);
770 if ((item_size
/ csum_size
) >=
771 MAX_CSUM_ITEMS(root
, csum_size
)) {
772 /* already at max size, make a new one */
776 int slot
= path
->slots
[0] + 1;
777 /* we didn't find a csum item, insert one */
778 nritems
= btrfs_header_nritems(path
->nodes
[0]);
779 if (!nritems
|| (path
->slots
[0] >= nritems
- 1)) {
780 ret
= btrfs_next_leaf(root
, path
);
785 slot
= path
->slots
[0];
787 btrfs_item_key_to_cpu(path
->nodes
[0], &found_key
, slot
);
788 if (found_key
.objectid
!= BTRFS_EXTENT_CSUM_OBJECTID
||
789 found_key
.type
!= BTRFS_EXTENT_CSUM_KEY
) {
793 next_offset
= found_key
.offset
;
799 * at this point, we know the tree has an item, but it isn't big
800 * enough yet to put our csum in. Grow it
802 btrfs_release_path(path
);
803 ret
= btrfs_search_slot(trans
, root
, &file_key
, path
,
809 if (path
->slots
[0] == 0)
814 leaf
= path
->nodes
[0];
815 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
816 csum_offset
= (bytenr
- found_key
.offset
) >>
817 root
->fs_info
->sb
->s_blocksize_bits
;
819 if (found_key
.type
!= BTRFS_EXTENT_CSUM_KEY
||
820 found_key
.objectid
!= BTRFS_EXTENT_CSUM_OBJECTID
||
821 csum_offset
>= MAX_CSUM_ITEMS(root
, csum_size
)) {
825 if (csum_offset
== btrfs_item_size_nr(leaf
, path
->slots
[0]) /
832 if (btrfs_leaf_free_space(root
, leaf
) <
833 sizeof(struct btrfs_item
) + csum_size
* 2)
836 free_space
= btrfs_leaf_free_space(root
, leaf
) -
837 sizeof(struct btrfs_item
) - csum_size
;
838 tmp
= sums
->len
- total_bytes
;
839 tmp
>>= root
->fs_info
->sb
->s_blocksize_bits
;
842 extend_nr
= max_t(int, 1, (int)tmp
);
843 diff
= (csum_offset
+ extend_nr
) * csum_size
;
844 diff
= min(diff
, MAX_CSUM_ITEMS(root
, csum_size
) * csum_size
);
846 diff
= diff
- btrfs_item_size_nr(leaf
, path
->slots
[0]);
847 diff
= min(free_space
, diff
);
851 btrfs_extend_item(root
, path
, diff
);
857 btrfs_release_path(path
);
862 tmp
= sums
->len
- total_bytes
;
863 tmp
>>= root
->fs_info
->sb
->s_blocksize_bits
;
864 tmp
= min(tmp
, (next_offset
- file_key
.offset
) >>
865 root
->fs_info
->sb
->s_blocksize_bits
);
867 tmp
= max((u64
)1, tmp
);
868 tmp
= min(tmp
, (u64
)MAX_CSUM_ITEMS(root
, csum_size
));
869 ins_size
= csum_size
* tmp
;
871 ins_size
= csum_size
;
873 path
->leave_spinning
= 1;
874 ret
= btrfs_insert_empty_item(trans
, root
, path
, &file_key
,
876 path
->leave_spinning
= 0;
879 if (WARN_ON(ret
!= 0))
881 leaf
= path
->nodes
[0];
883 item
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_csum_item
);
884 item_end
= (struct btrfs_csum_item
*)((unsigned char *)item
+
885 btrfs_item_size_nr(leaf
, path
->slots
[0]));
886 item
= (struct btrfs_csum_item
*)((unsigned char *)item
+
887 csum_offset
* csum_size
);
889 ins_size
= (u32
)(sums
->len
- total_bytes
) >>
890 root
->fs_info
->sb
->s_blocksize_bits
;
891 ins_size
*= csum_size
;
892 ins_size
= min_t(u32
, (unsigned long)item_end
- (unsigned long)item
,
894 write_extent_buffer(leaf
, sums
->sums
+ index
, (unsigned long)item
,
897 ins_size
/= csum_size
;
898 total_bytes
+= ins_size
* root
->sectorsize
;
901 btrfs_mark_buffer_dirty(path
->nodes
[0]);
902 if (total_bytes
< sums
->len
) {
903 btrfs_release_path(path
);
908 btrfs_free_path(path
);
915 void btrfs_extent_item_to_extent_map(struct inode
*inode
,
916 const struct btrfs_path
*path
,
917 struct btrfs_file_extent_item
*fi
,
918 const bool new_inline
,
919 struct extent_map
*em
)
921 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
922 struct extent_buffer
*leaf
= path
->nodes
[0];
923 const int slot
= path
->slots
[0];
924 struct btrfs_key key
;
925 u64 extent_start
, extent_end
;
927 u8 type
= btrfs_file_extent_type(leaf
, fi
);
928 int compress_type
= btrfs_file_extent_compression(leaf
, fi
);
930 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
931 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
932 extent_start
= key
.offset
;
934 if (type
== BTRFS_FILE_EXTENT_REG
||
935 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
936 extent_end
= extent_start
+
937 btrfs_file_extent_num_bytes(leaf
, fi
);
938 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
940 size
= btrfs_file_extent_inline_len(leaf
, slot
, fi
);
941 extent_end
= ALIGN(extent_start
+ size
, root
->sectorsize
);
944 em
->ram_bytes
= btrfs_file_extent_ram_bytes(leaf
, fi
);
945 if (type
== BTRFS_FILE_EXTENT_REG
||
946 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
947 em
->start
= extent_start
;
948 em
->len
= extent_end
- extent_start
;
949 em
->orig_start
= extent_start
-
950 btrfs_file_extent_offset(leaf
, fi
);
951 em
->orig_block_len
= btrfs_file_extent_disk_num_bytes(leaf
, fi
);
952 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
954 em
->block_start
= EXTENT_MAP_HOLE
;
957 if (compress_type
!= BTRFS_COMPRESS_NONE
) {
958 set_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
);
959 em
->compress_type
= compress_type
;
960 em
->block_start
= bytenr
;
961 em
->block_len
= em
->orig_block_len
;
963 bytenr
+= btrfs_file_extent_offset(leaf
, fi
);
964 em
->block_start
= bytenr
;
965 em
->block_len
= em
->len
;
966 if (type
== BTRFS_FILE_EXTENT_PREALLOC
)
967 set_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
);
969 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
970 em
->block_start
= EXTENT_MAP_INLINE
;
971 em
->start
= extent_start
;
972 em
->len
= extent_end
- extent_start
;
974 * Initialize orig_start and block_len with the same values
975 * as in inode.c:btrfs_get_extent().
977 em
->orig_start
= EXTENT_MAP_HOLE
;
978 em
->block_len
= (u64
)-1;
979 if (!new_inline
&& compress_type
!= BTRFS_COMPRESS_NONE
) {
980 set_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
);
981 em
->compress_type
= compress_type
;
984 btrfs_err(root
->fs_info
,
985 "unknown file extent item type %d, inode %llu, offset %llu, root %llu",
986 type
, btrfs_ino(inode
), extent_start
,
987 root
->root_key
.objectid
);