xfs: Fix leak of discard bio

commit ea7bd56fa309d10a41b1041827a63c0746c47554 upstream.

The bio describing discard operation is allocated by
__blkdev_issue_discard() which returns us a reference to it. That
reference is never released and thus we leak this bio. Drop the bio
reference once it completes in xlog_discard_endio().

Fixes: 4560e78f40cb55bd2ea8f1ef4001c5baa88531c7
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index 82f1cbcc4de15ce254322aaa50afb7cdfcb82ae0..1f53dc23aebe9d1a14e688677166528992ff41f7 100644 (file)
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -519,6 +519,7 @@ xlog_discard_endio(
 
        INIT_WORK(&ctx->discard_endio_work, xlog_discard_endio_work);
        queue_work(xfs_discard_wq, &ctx->discard_endio_work);
+       bio_put(bio);
 }
 
 static void