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authorBrian Foster <bfoster@redhat.com>2016-07-20 04:13:43 +0300
committerDave Chinner <david@fromorbit.com>2016-07-20 04:13:43 +0300
commitc891c30a4dd1a236bb98630b35fc2769c5ce0d40 (patch)
tree38f8824c5d44ce4898ecef28d9f5b72307fa6e2f /fs/xfs/xfs_buf.h
parent5539d36752eb789f4067a9f88e72177895d56317 (diff)
downloadlinux-c891c30a4dd1a236bb98630b35fc2769c5ce0d40.tar.xz
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.h')
-rw-r--r--fs/xfs/xfs_buf.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index 8bfb974f0772..e2108dab82a2 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -43,6 +43,7 @@ typedef enum {
#define XBF_READ (1 << 0) /* buffer intended for reading from device */
#define XBF_WRITE (1 << 1) /* buffer intended for writing to device */
#define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */
+#define XBF_NO_IOACCT (1 << 3) /* bypass I/O accounting (non-LRU bufs) */
#define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */
#define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */
#define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */