[XFS] Ensure errors from xfs_bdstrat() are correctly checked.

xfsbdstrat() is declared to return an error. That is never checked because
the error is propagated by the xfs_buf_t that is passed through the
function.

Mark xfsbdstrat() as returning void and comment the prototype on the
methods needed for error checking.

SGI-PV: 980084
SGI-Modid: xfs-linux-melb:xfs-kern:30823a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

6 files changed, 21 insertions, 26 deletions

diff --git a/fs/xfs/linux-2.6/xfs_lrw.c b/fs/xfs/linux-2.6/xfs_lrw.c
index 1d95dca96cfe..f6dab5d8944e 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.c
+++ b/fs/xfs/linux-2.6/xfs_lrw.c
@@ -875,28 +875,21 @@ xfs_bdstrat_cb(struct xfs_buf *bp)
 }
 
 /*
- * Wrapper around bdstrat so that we can stop data
- * from going to disk in case we are shutting down the filesystem.
- * Typically user data goes thru this path; one of the exceptions
- * is the superblock.
+ * Wrapper around bdstrat so that we can stop data from going to disk in case
+ * we are shutting down the filesystem.  Typically user data goes thru this
+ * path; one of the exceptions is the superblock.
  */
-int
+void
 xfsbdstrat(
         struct xfs_mount        *mp,
         struct xfs_buf          *bp)
 {
         ASSERT(mp);
-        if (!XFS_FORCED_SHUTDOWN(mp)) {
-                /* Grio redirection would go here
-                 * if (XFS_BUF_IS_GRIO(bp)) {
-                 */
-
+        if (!XFS_FORCED_SHUTDOWN(mp))
                 xfs_buf_iorequest(bp);
-                return 0;
-        }
 
         xfs_buftrace("XFSBDSTRAT IOERROR", bp);
-        return (xfs_bioerror_relse(bp));
+        xfs_bioerror_relse(bp);
 }
 
 /*
diff --git a/fs/xfs/linux-2.6/xfs_lrw.h b/fs/xfs/linux-2.6/xfs_lrw.h
index e200253139cf..e1d498b4ba7a 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.h
+++ b/fs/xfs/linux-2.6/xfs_lrw.h
@@ -68,7 +68,8 @@ extern void xfs_inval_cached_trace(struct xfs_inode *,
 #define xfs_inval_cached_trace(ip, offset, len, first, last)
 #endif
 
-extern int xfsbdstrat(struct xfs_mount *, struct xfs_buf *);
+/* errors from xfsbdstrat() must be extracted from the buffer */
+extern void xfsbdstrat(struct xfs_mount *, struct xfs_buf *);
 extern int xfs_bdstrat_cb(struct xfs_buf *);
 extern int xfs_dev_is_read_only(struct xfs_mount *, char *);
 
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 3a8fe7bfa2af..1f83298f90aa 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -121,7 +121,8 @@ xlog_bread(
         XFS_BUF_SET_TARGET(bp, log->l_mp->m_logdev_targp);
 
         xfsbdstrat(log->l_mp, bp);
-        if ((error = xfs_iowait(bp)))
+        error = xfs_iowait(bp);
+        if (error)
                 xfs_ioerror_alert("xlog_bread", log->l_mp,
                                   bp, XFS_BUF_ADDR(bp));
         return error;
@@ -3849,7 +3850,8 @@ xlog_do_recover(
         XFS_BUF_READ(bp);
         XFS_BUF_UNASYNC(bp);
         xfsbdstrat(log->l_mp, bp);
-        if ((error = xfs_iowait(bp))) {
+        error = xfs_iowait(bp);
+        if (error) {
                 xfs_ioerror_alert("xlog_do_recover",
                                   log->l_mp, bp, XFS_BUF_ADDR(bp));
                 ASSERT(0);
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 2d03fe194c2c..2fec452afbcc 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -1470,7 +1470,6 @@ xfs_unmountfs_writesb(xfs_mount_t *mp)
                 XFS_BUF_UNASYNC(sbp);
                 ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp);
                 xfsbdstrat(mp, sbp);
-                /* Nevermind errors we might get here. */
                 error = xfs_iowait(sbp);
                 if (error)
                         xfs_ioerror_alert("xfs_unmountfs_writesb",
diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c
index 4e5c010f5040..cb0c5839154b 100644
--- a/fs/xfs/xfs_trans_buf.c
+++ b/fs/xfs/xfs_trans_buf.c
@@ -354,17 +354,15 @@ xfs_trans_read_buf(
                         ASSERT(!XFS_BUF_ISASYNC(bp));
                         XFS_BUF_READ(bp);
                         xfsbdstrat(tp->t_mountp, bp);
-                        xfs_iowait(bp);
-                        if (XFS_BUF_GETERROR(bp) != 0) {
+                        error = xfs_iowait(bp);
+                        if (error) {
                                 xfs_ioerror_alert("xfs_trans_read_buf", mp,
                                                   bp, blkno);
-                                error = XFS_BUF_GETERROR(bp);
                                 xfs_buf_relse(bp);
                                 /*
-                                 * We can gracefully recover from most
-                                 * read errors. Ones we can't are those
-                                 * that happen after the transaction's
-                                 * already dirty.
+                                 * We can gracefully recover from most read
+                                 * errors. Ones we can't are those that happen
+                                 * after the transaction's already dirty.
                                  */
                                 if (tp->t_flags & XFS_TRANS_DIRTY)
                                         xfs_force_shutdown(tp->t_mountp,
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index ca38fb9a9937..dd4621e0ab3b 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -3825,7 +3825,8 @@ xfs_zero_remaining_bytes(
                 XFS_BUF_READ(bp);
                 XFS_BUF_SET_ADDR(bp, XFS_FSB_TO_DB(ip, imap.br_startblock));
                 xfsbdstrat(mp, bp);
-                if ((error = xfs_iowait(bp))) {
+                error = xfs_iowait(bp);
+                if (error) {
                         xfs_ioerror_alert("xfs_zero_remaining_bytes(read)",
                                           mp, bp, XFS_BUF_ADDR(bp));
                         break;
@@ -3837,7 +3838,8 @@ xfs_zero_remaining_bytes(
                 XFS_BUF_UNREAD(bp);
                 XFS_BUF_WRITE(bp);
                 xfsbdstrat(mp, bp);
-                if ((error = xfs_iowait(bp))) {
+                error = xfs_iowait(bp);
+                if (error) {
                         xfs_ioerror_alert("xfs_zero_remaining_bytes(write)",
                                           mp, bp, XFS_BUF_ADDR(bp));
                         break;