diff options
| author | Christoph Hellwig <hch@lst.de> | 2022-05-26 09:36:42 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2022-07-25 17:45:33 +0200 |
| commit | 9ff7ddd3c7ad7f6537cd66d3f455c7717bd358b9 (patch) | |
| tree | 2ec805674d832a7784c9440c800c088ef0b21107 /fs/btrfs/volumes.h | |
| parent | a316a25991688ab037e5a41209736c017b5a9511 (diff) | |
btrfs: do not allocate a btrfs_bio for low-level bios
The bios submitted from btrfs_map_bio don't really interact with the
rest of btrfs and the only btrfs_bio member actually used in the
low-level bios is the pointer to the btrfs_io_context used for endio
handler.
Use a union in struct btrfs_io_stripe that allows the endio handler to
find the btrfs_io_context and remove the spurious ->device assignment
so that a plain fs_bio_set bio can be used for the low-level bios
allocated inside btrfs_map_bio.
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 7973d11e5f5d..a3c3a0d716bd 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -412,7 +412,12 @@ static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio) struct btrfs_io_stripe { struct btrfs_device *dev; - u64 physical; + union { + /* Block mapping */ + u64 physical; + /* For the endio handler */ + struct btrfs_io_context *bioc; + }; u64 length; /* only used for discard mappings */ }; |