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authorBrian Foster <bfoster@redhat.com>2016-07-20 11:13:43 +1000
committerDave Chinner <david@fromorbit.com>2016-07-20 11:13:43 +1000
commitc891c30a4dd1a236bb98630b35fc2769c5ce0d40 (patch)
tree38f8824c5d44ce4898ecef28d9f5b72307fa6e2f /fs/xfs/xfs_buf.c
parent5539d36752eb789f4067a9f88e72177895d56317 (diff)
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xfs: exclude never-released buffers from buftarg I/O accounting
The upcoming buftarg I/O accounting mechanism maintains a count of all buffers that have undergone I/O in the current hold-release cycle. Certain buffers associated with core infrastructure (e.g., the xfs_mount superblock buffer, log buffers) are never released, however. This means that accounting I/O submission on such buffers elevates the buftarg count indefinitely and could lead to lockup on unmount. Define a new buffer flag to explicitly exclude buffers from buftarg I/O accounting. Set the flag on the superblock and associated log buffers. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_buf.c')
-rw-r--r--fs/xfs/xfs_buf.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 5d52e44b89f7..c0bd5e0b244a 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -815,7 +815,8 @@ xfs_buf_get_uncached(
struct xfs_buf *bp;
DEFINE_SINGLE_BUF_MAP(map, XFS_BUF_DADDR_NULL, numblks);
- bp = _xfs_buf_alloc(target, &map, 1, 0);
+ /* flags might contain irrelevant bits, pass only what we care about */
+ bp = _xfs_buf_alloc(target, &map, 1, flags & XBF_NO_IOACCT);
if (unlikely(bp == NULL))
goto fail;