diff options
| author | Christoph Hellwig <hch@lst.de> | 2023-01-21 07:50:20 +0100 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2023-02-15 19:38:52 +0100 |
| commit | 852eee62d31abd695cd43e1b875d664ed292a8ca (patch) | |
| tree | f1aa0ca8c66c12246fdf046b317dd273f2c94a6e /fs/btrfs/bio.h | |
| parent | 542e300e8398ea529a4a20a125c77d234d5ca37e (diff) | |
btrfs: allow btrfs_submit_bio to split bios
Currently the I/O submitters have to split bios according to the chunk
stripe boundaries. This leads to extra lookups in the extent trees and
a lot of boilerplate code.
To drop this requirement, split the bio when __btrfs_map_block returns a
mapping that is smaller than the requested size and keep a count of
pending bios in the original btrfs_bio so that the upper level
completion is only invoked when all clones have completed.
Based on a patch from Qu Wenruo.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
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/bio.h')
| -rw-r--r-- | fs/btrfs/bio.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/bio.h b/fs/btrfs/bio.h index 4142004ce053..67d416cf293d 100644 --- a/fs/btrfs/bio.h +++ b/fs/btrfs/bio.h @@ -55,6 +55,7 @@ struct btrfs_bio { /* For internal use in read end I/O handling */ unsigned int mirror_num; + atomic_t pending_ios; struct work_struct end_io_work; /* |