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| author | Nikolay Borisov <nborisov@suse.com> | 2017-12-13 13:50:07 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2018-01-02 18:00:13 +0100 |
| commit | beed9263f4000c48a5c48912f26576f6fa091181 (patch) | |
| tree | 655a1228428a5a192894a942af10c21ba396e2ff /fs | |
| parent | c8bcbfbd239ed60a6562964b58034ac8a25f4c31 (diff) | |
| download | linux-beed9263f4000c48a5c48912f26576f6fa091181.tar.gz linux-beed9263f4000c48a5c48912f26576f6fa091181.tar.bz2 linux-beed9263f4000c48a5c48912f26576f6fa091181.zip | |
btrfs: Fix flush bio leak
Commit e0ae99941423 ("btrfs: preallocate device flush bio") reworked
the way the flush bio is allocated and used. Concretely it allocates
the bio in __alloc_device and then re-uses it multiple times with a
very simple endio routine that just calls complete() without consuming
a reference. Allocated bios by default come with a ref count of 1,
which is then consumed by the endio routine (or not, in which case they
should be bio_put by the caller). The way the impleementation works now
is that the flush bio has a refcount of 2 and we only ever bio_put it
once, leaving it to hang indefinitely. Fix this by removing the extra
bio_get in __alloc_device.
Fixes: e0ae99941423 ("btrfs: preallocate device flush bio")
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/volumes.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index d48b24e54366..94d28f549837 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -237,7 +237,6 @@ static struct btrfs_device *__alloc_device(void) kfree(dev); return ERR_PTR(-ENOMEM); } - bio_get(dev->flush_bio); INIT_LIST_HEAD(&dev->dev_list); INIT_LIST_HEAD(&dev->dev_alloc_list); |