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authorDave Chinner <dchinner@redhat.com>2012-04-23 15:58:46 +1000
committerBen Myers <bpm@sgi.com>2012-05-14 16:20:42 -0500
commit0e95f19ad983e72a9cb93a67b3290b58f0467b36 (patch)
tree2b3117e20f1e739d5cb560b1b1b32f3fdc8e3ee5 /fs/xfs/xfs_buf.c
parentfe2429b0966a7ec42b5fe3bf96f0f10de0a3b536 (diff)
xfs: check for buffer errors before waiting
If we call xfs_buf_iowait() on a buffer that failed dispatch due to an IO error, it will wait forever for an Io that does not exist. This is hndled in xfs_buf_read, but there is other code that calls xfs_buf_iowait directly that doesn't. Rather than make the call sites have to handle checking for dispatch errors and then checking for completion errors, make xfs_buf_iowait() check for dispatch errors on the buffer before waiting. This means we handle both dispatch and completion errors with one set of error handling at the caller sites. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_buf.c')
-rw-r--r--fs/xfs/xfs_buf.c22
1 files changed, 10 insertions, 12 deletions
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index da2541e5ff8..86d9af70ab3 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -600,17 +600,15 @@ _xfs_buf_read(
xfs_buf_t *bp,
xfs_buf_flags_t flags)
{
- int status;
-
ASSERT(!(flags & XBF_WRITE));
ASSERT(bp->b_bn != XFS_BUF_DADDR_NULL);
bp->b_flags &= ~(XBF_WRITE | XBF_ASYNC | XBF_READ_AHEAD);
bp->b_flags |= flags & (XBF_READ | XBF_ASYNC | XBF_READ_AHEAD);
- status = xfs_buf_iorequest(bp);
- if (status || bp->b_error || (flags & XBF_ASYNC))
- return status;
+ xfs_buf_iorequest(bp);
+ if (flags & XBF_ASYNC)
+ return 0;
return xfs_buf_iowait(bp);
}
@@ -695,7 +693,7 @@ xfs_buf_read_uncached(
xfsbdstrat(mp, bp);
error = xfs_buf_iowait(bp);
- if (error || bp->b_error) {
+ if (error) {
xfs_buf_relse(bp);
return NULL;
}
@@ -1252,7 +1250,7 @@ next_chunk:
}
}
-int
+void
xfs_buf_iorequest(
xfs_buf_t *bp)
{
@@ -1273,13 +1271,12 @@ xfs_buf_iorequest(
_xfs_buf_ioend(bp, 0);
xfs_buf_rele(bp);
- return 0;
}
/*
- * Waits for I/O to complete on the buffer supplied.
- * It returns immediately if no I/O is pending.
- * It returns the I/O error code, if any, or 0 if there was no error.
+ * Waits for I/O to complete on the buffer supplied. It returns immediately if
+ * no I/O is pending or there is already a pending error on the buffer. It
+ * returns the I/O error code, if any, or 0 if there was no error.
*/
int
xfs_buf_iowait(
@@ -1287,7 +1284,8 @@ xfs_buf_iowait(
{
trace_xfs_buf_iowait(bp, _RET_IP_);
- wait_for_completion(&bp->b_iowait);
+ if (!bp->b_error)
+ wait_for_completion(&bp->b_iowait);
trace_xfs_buf_iowait_done(bp, _RET_IP_);
return bp->b_error;