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authorChris Mason <chris.mason@oracle.com>2008-07-18 14:17:13 +0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 19:04:05 +0400
commit3edf7d33f4edb1e4a9bb0a4c0a84d95fb4d22a09 (patch)
tree8698a6dd1d0d038f1b56f79c92783518d36f2145 /fs/btrfs/file-item.c
parenteb84ae039e10f1f80443d846ba1350122bbdc753 (diff)
downloadlinux-3edf7d33f4edb1e4a9bb0a4c0a84d95fb4d22a09.tar.xz
Btrfs: Handle data checksumming on bios that span multiple ordered extents
Data checksumming is done right before the bio is sent down the IO stack, which means a single bio might span more than one ordered extent. In this case, the checksumming data is split between two ordered extents. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/file-item.c')
-rw-r--r--fs/btrfs/file-item.c43
1 files changed, 39 insertions, 4 deletions
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 345caf8ff516..e02f1e5acb0a 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -134,26 +134,53 @@ int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
return ret;
}
-int btrfs_csum_one_bio(struct btrfs_root *root,
- struct bio *bio, struct btrfs_ordered_sum **sums_ret)
+int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
+ struct bio *bio)
{
struct btrfs_ordered_sum *sums;
struct btrfs_sector_sum *sector_sum;
+ struct btrfs_ordered_extent *ordered;
char *data;
struct bio_vec *bvec = bio->bi_io_vec;
int bio_index = 0;
+ unsigned long total_bytes = 0;
+ unsigned long this_sum_bytes = 0;
+ u64 offset;
WARN_ON(bio->bi_vcnt <= 0);
sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS);
if (!sums)
return -ENOMEM;
- *sums_ret = sums;
+
sector_sum = &sums->sums;
- sums->file_offset = page_offset(bvec->bv_page);
+ sums->file_offset = page_offset(bvec->bv_page) + bvec->bv_offset;
sums->len = bio->bi_size;
INIT_LIST_HEAD(&sums->list);
+ ordered = btrfs_lookup_ordered_extent(inode, sums->file_offset);
+ BUG_ON(!ordered);
while(bio_index < bio->bi_vcnt) {
+ offset = page_offset(bvec->bv_page) + bvec->bv_offset;
+ if (offset >= ordered->file_offset + ordered->len) {
+ unsigned long bytes_left;
+ sums->len = this_sum_bytes;
+ this_sum_bytes = 0;
+ btrfs_add_ordered_sum(inode, ordered, sums);
+ btrfs_put_ordered_extent(ordered);
+
+ bytes_left = bio->bi_size - total_bytes;
+
+ sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left),
+ GFP_NOFS);
+ BUG_ON(!sums);
+ sector_sum = &sums->sums;
+ sums->len = bytes_left;
+ sums->file_offset = offset;
+ ordered = btrfs_lookup_ordered_extent(inode,
+ sums->file_offset);
+ BUG_ON(!ordered);
+ }
+
data = kmap_atomic(bvec->bv_page, KM_USER0);
sector_sum->sum = ~(u32)0;
sector_sum->sum = btrfs_csum_data(root,
@@ -165,10 +192,18 @@ int btrfs_csum_one_bio(struct btrfs_root *root,
(char *)&sector_sum->sum);
sector_sum->offset = page_offset(bvec->bv_page) +
bvec->bv_offset;
+
sector_sum++;
bio_index++;
+ total_bytes += bvec->bv_len;
+ this_sum_bytes += bvec->bv_len;
bvec++;
}
+ btrfs_add_ordered_sum(inode, ordered, sums);
+ btrfs_put_ordered_extent(ordered);
+ if (total_bytes != bio->bi_size) {
+printk("warning, total bytes %lu bio size %u\n", total_bytes, bio->bi_size);
+ }
return 0;
}