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| author | Brian Foster <bfoster@redhat.com> | 2016-07-20 11:13:43 +1000 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2016-07-20 11:13:43 +1000 |
| commit | c891c30a4dd1a236bb98630b35fc2769c5ce0d40 (patch) | |
| tree | 38f8824c5d44ce4898ecef28d9f5b72307fa6e2f /fs/xfs/xfs_buf.c | |
| parent | 5539d36752eb789f4067a9f88e72177895d56317 (diff) | |
| download | blackbird-obmc-linux-c891c30a4dd1a236bb98630b35fc2769c5ce0d40.tar.gz blackbird-obmc-linux-c891c30a4dd1a236bb98630b35fc2769c5ce0d40.zip | |
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.c | 3 |
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; |
