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| author |   Paolo Valente <paolo.valente@linaro.org> | 2016-07-27 07:22:05 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@fb.com> | 2016-08-04 14:19:16 -0600 |
| commit | 20bd723ec6a3261df5e02250cd3a1fbb09a343f2 (patch) | |
| tree | b01a2118ba7e909481f91c28a5a81108251a842c /fs/btrfs | |
| parent | blkcg: kill unused field nr_undestroyed_grps (diff) | |
| download | linux-dev-20bd723ec6a3261df5e02250cd3a1fbb09a343f2.tar.xz linux-dev-20bd723ec6a3261df5e02250cd3a1fbb09a343f2.zip | |
block: add missing group association in bio-cloning functions
When a bio is cloned, the newly created bio must be associated with
the same blkcg as the original bio (if BLK_CGROUP is enabled). If
this operation is not performed, then the new bio is not associated
with any group, and the group of the current task is returned when
the group of the bio is requested.
Depending on the cloning frequency, this may cause a large
percentage of the bios belonging to a given group to be treated
as if belonging to other groups (in most cases as if belonging to
the root group). The expected group isolation may thereby be broken.
This commit adds the missing association in bio-cloning functions.
Fixes: da2f0f74cf7d ("Btrfs: add support for blkio controllers")
Cc: stable@vger.kernel.org # v4.3+
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Reviewed-by: Nikolay Borisov <kernel@kyup.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/extent_io.c | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index cee4cb99b8ce..5850d79806f4 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2697,12 +2697,6 @@ struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask) btrfs_bio->csum = NULL; btrfs_bio->csum_allocated = NULL; btrfs_bio->end_io = NULL; - -#ifdef CONFIG_BLK_CGROUP - /* FIXME, put this into bio_clone_bioset */ - if (bio->bi_css) - bio_associate_blkcg(new, bio->bi_css); -#endif } return new; } |