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authorLiu Bo <bo.li.liu@oracle.com>2017-05-15 15:33:27 -0700
committerDavid Sterba <dsterba@suse.com>2017-06-19 18:25:59 +0200
commit17347cec15f919901c90cdbf98af47ed2ed28b9f (patch)
tree27fa6d42856840f59bf9cc1cb042ee234a355cf1 /fs/btrfs/volumes.h
parent725130bac5857ac035cf9f47d2973ee4e734db54 (diff)
downloadlinux-17347cec15f919901c90cdbf98af47ed2ed28b9f.tar.bz2
Btrfs: change how we iterate bios in endio
Since dio submit has used bio_clone_fast, the submitted bio may not have a reliable bi_vcnt, for the bio vector iterations in checksum related functions, bio->bi_iter is not modified yet and it's safe to use bio_for_each_segment, while for those bio vector iterations in dio read's endio, we now save a copy of bvec_iter in struct btrfs_io_bio when cloning bios and use the helper __bio_for_each_segment with the saved bvec_iter to access each bvec. Also for dio reads which don't get split, we also need to save a copy of bio iterator in btrfs_bio_clone to let __bio_for_each_segments to access each bvec in dio read's endio. Note that it doesn't affect other calls of btrfs_bio_clone() because they don't need to use this iterator. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/volumes.h')
-rw-r--r--fs/btrfs/volumes.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 094521729df1..58b97b6f5f02 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -280,6 +280,7 @@ struct btrfs_io_bio {
u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
u8 *csum_allocated;
btrfs_io_bio_end_io_t *end_io;
+ struct bvec_iter iter;
struct bio bio;
};