Rework the loop a little bit to use the generic bio_for_each_segment_all
helper for iterating over the bio.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/btrfs/file-item.c | 31 +++++++++++--------------------
1 file changed, 11 insertions(+), 20 deletions(-)
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index fa8aa53..54ccb91 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -163,7 +163,7 @@ static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
struct inode *inode, struct bio *bio,
u64 logical_offset, u32 *dst, int dio)
{
- struct bio_vec *bvec = bio->bi_io_vec;
+ struct bio_vec *bvec;
struct btrfs_io_bio *btrfs_bio = btrfs_io_bio(bio);
struct btrfs_csum_item *item = NULL;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
@@ -177,7 +177,7 @@ static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
u32 diff;
int nblocks;
int bio_index = 0;
- int count;
+ int count = 0;
u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
path = btrfs_alloc_path();
@@ -223,8 +223,11 @@ static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
if (dio)
offset = logical_offset;
- page_bytes_left = bvec->bv_len;
- while (bio_index < bio->bi_vcnt) {
+ bio_for_each_segment_all(bvec, bio, bio_index) {
+ page_bytes_left = bvec->bv_len;
+ if (count)
+ goto next;
+
if (!dio)
offset = page_offset(bvec->bv_page) + bvec->bv_offset;
count = btrfs_find_ordered_sum(inode, offset, disk_bytenr,
@@ -285,29 +288,17 @@ static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
found:
csum += count * csum_size;
nblocks -= count;
-
+next:
while (count--) {
disk_bytenr += root->sectorsize;
offset += root->sectorsize;
page_bytes_left -= root->sectorsize;
- if (!page_bytes_left) {
- bio_index++;
- /*
- * make sure we're still inside the
- * bio before we update page_bytes_left
- */
- if (bio_index >= bio->bi_vcnt) {
- WARN_ON_ONCE(count);
- goto done;
- }
- bvec++;
- page_bytes_left = bvec->bv_len;
- }
-
+ if (!page_bytes_left)
+ break; /* move to next bio */
}
}
-done:
+ WARN_ON_ONCE(count);
btrfs_free_path(path);
return 0;
}
--
2.1.4
--
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