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authorPaolo Valente <paolo.valente@linaro.org>2016-07-27 08:22:05 +0300
committerJens Axboe <axboe@fb.com>2016-08-04 23:19:16 +0300
commit20bd723ec6a3261df5e02250cd3a1fbb09a343f2 (patch)
treeb01a2118ba7e909481f91c28a5a81108251a842c
parentbfd279a868987e4bca7dc72a029e0fc50316d6df (diff)
downloadlinux-20bd723ec6a3261df5e02250cd3a1fbb09a343f2.tar.xz
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>
-rw-r--r--block/bio.c15
-rw-r--r--fs/btrfs/extent_io.c6
-rw-r--r--include/linux/bio.h3
3 files changed, 18 insertions, 6 deletions
diff --git a/block/bio.c b/block/bio.c
index 54ee3846c3a5..3f76a38a5e2d 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -583,6 +583,8 @@ void __bio_clone_fast(struct bio *bio, struct bio *bio_src)
bio->bi_rw = bio_src->bi_rw;
bio->bi_iter = bio_src->bi_iter;
bio->bi_io_vec = bio_src->bi_io_vec;
+
+ bio_clone_blkcg_association(bio, bio_src);
}
EXPORT_SYMBOL(__bio_clone_fast);
@@ -687,6 +689,8 @@ integrity_clone:
}
}
+ bio_clone_blkcg_association(bio, bio_src);
+
return bio;
}
EXPORT_SYMBOL(bio_clone_bioset);
@@ -2004,6 +2008,17 @@ void bio_disassociate_task(struct bio *bio)
}
}
+/**
+ * bio_clone_blkcg_association - clone blkcg association from src to dst bio
+ * @dst: destination bio
+ * @src: source bio
+ */
+void bio_clone_blkcg_association(struct bio *dst, struct bio *src)
+{
+ if (src->bi_css)
+ WARN_ON(bio_associate_blkcg(dst, src->bi_css));
+}
+
#endif /* CONFIG_BLK_CGROUP */
static void __init biovec_init_slabs(void)
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;
}
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 583c10810e32..e09a8895fc31 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -470,11 +470,14 @@ extern unsigned int bvec_nr_vecs(unsigned short idx);
int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css);
int bio_associate_current(struct bio *bio);
void bio_disassociate_task(struct bio *bio);
+void bio_clone_blkcg_association(struct bio *dst, struct bio *src);
#else /* CONFIG_BLK_CGROUP */
static inline int bio_associate_blkcg(struct bio *bio,
struct cgroup_subsys_state *blkcg_css) { return 0; }
static inline int bio_associate_current(struct bio *bio) { return -ENOENT; }
static inline void bio_disassociate_task(struct bio *bio) { }
+static inline void bio_clone_blkcg_association(struct bio *dst,
+ struct bio *src) { }
#endif /* CONFIG_BLK_CGROUP */
#ifdef CONFIG_HIGHMEM