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>

3 files changed, 13 insertions, 13 deletions

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index da2541e5ff81..86d9af70ab3b 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;
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index 7083cf44d95f..87a474853f8a 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -191,7 +191,7 @@ extern int xfs_bdstrat_cb(struct xfs_buf *);
 extern void xfs_buf_ioend(xfs_buf_t *,  int);
 extern void xfs_buf_ioerror(xfs_buf_t *, int);
 extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func);
-extern int xfs_buf_iorequest(xfs_buf_t *);
+extern void xfs_buf_iorequest(xfs_buf_t *);
 extern int xfs_buf_iowait(xfs_buf_t *);
 extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *,
                                 xfs_buf_rw_t);
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 5540e79da6f5..e1577e763fdf 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -179,6 +179,7 @@ xlog_bread_noalign(
         XFS_BUF_SET_ADDR(bp, log->l_logBBstart + blk_no);
         XFS_BUF_READ(bp);
         XFS_BUF_SET_COUNT(bp, BBTOB(nbblks));
+        bp->b_error = 0;
 
         xfsbdstrat(log->l_mp, bp);
         error = xfs_buf_iowait(bp);
@@ -266,6 +267,7 @@ xlog_bwrite(
         xfs_buf_hold(bp);
         xfs_buf_lock(bp);
         XFS_BUF_SET_COUNT(bp, BBTOB(nbblks));
+        bp->b_error = 0;
 
         error = xfs_bwrite(bp);
         if (error)