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btrfs: document mandatory order of bio in btrfs_io_bio

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Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-06-12 17:29:36 +02:00
parent 1a63143dc1
commit fa1bcbe0a5
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/volumes.h
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@ -281,6 +281,10 @@ struct btrfs_io_bio {
u8 *csum_allocated;
btrfs_io_bio_end_io_t *end_io;
struct bvec_iter iter;
/*
* This member must come last, bio_alloc_bioset will allocate enough
* bytes for entire btrfs_io_bio but relies on bio being last.
*/
struct bio bio;
};