[XFS] Sanitise xfs_log_force error checking.

xfs_log_force() is declared to return an error, but we almost never check
it. We don't need to check it in most cases; if there's a log I/O error
then we'll be shutting down the filesystem anyway and that means we'll
catch the error somewhere else.

However, on certain calls we should be returning an error - sync
transactions, fsync, sync writes, etc. so this isn't a pure black and
white distinction. Hence make xfs_log_force() a void function that issues
a warning to the syslog on error, and call _xfs_log_force() in all the
places where we actually care about the error status returned.

SGI-PV: 980084
SGI-Modid: xfs-linux-melb:xfs-kern:30832a

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

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index bece882..e29ea0a 100644 (file)
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -382,7 +382,27 @@ _xfs_log_force(
                return xlog_state_sync_all(log, flags, log_flushed);
        else
                return xlog_state_sync(log, lsn, flags, log_flushed);
-}      /* xfs_log_force */
+}      /* _xfs_log_force */
+
+/*
+ * Wrapper for _xfs_log_force(), to be used when caller doesn't care
+ * about errors or whether the log was flushed or not. This is the normal
+ * interface to use when trying to unpin items or move the log forward.
+ */
+void
+xfs_log_force(
+       xfs_mount_t     *mp,
+       xfs_lsn_t       lsn,
+       uint            flags)
+{
+       int     error;
+       error = _xfs_log_force(mp, lsn, flags, NULL);
+       if (error) {
+               xfs_fs_cmn_err(CE_WARN, mp, "xfs_log_force: "
+                       "error %d returned.", error);
+       }
+}
+
 
 /*
  * Attaches a new iclog I/O completion callback routine during
@@ -634,7 +654,8 @@ xfs_log_unmount_write(xfs_mount_t *mp)
        if (mp->m_flags & XFS_MOUNT_RDONLY)
                return 0;
 
-       xfs_log_force(mp, 0, XFS_LOG_FORCE|XFS_LOG_SYNC);
+       error = _xfs_log_force(mp, 0, XFS_LOG_FORCE|XFS_LOG_SYNC, NULL);
+       ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log)));
 
 #ifdef DEBUG
        first_iclog = iclog = log->l_iclog;

diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h
index 4cdac04..d1d678e 100644 (file)
--- a/fs/xfs/xfs_log.h
+++ b/fs/xfs/xfs_log.h
@@ -142,8 +142,9 @@ int   _xfs_log_force(struct xfs_mount *mp,
                         xfs_lsn_t      lsn,
                         uint           flags,
                         int            *log_forced);
-#define xfs_log_force(mp, lsn, flags) \
-       _xfs_log_force(mp, lsn, flags, NULL);
+void     xfs_log_force(struct xfs_mount        *mp,
+                       xfs_lsn_t               lsn,
+                       uint                    flags);
 int      xfs_log_mount(struct xfs_mount        *mp,
                        struct xfs_buftarg      *log_target,
                        xfs_daddr_t             start_block,

diff --git a/fs/xfs/xfs_rw.c b/fs/xfs/xfs_rw.c
index cd3ece6..b0f31c0 100644 (file)
--- a/fs/xfs/xfs_rw.c
+++ b/fs/xfs/xfs_rw.c
@@ -126,11 +126,11 @@ xfs_write_sync_logforce(
                 * when we return.
                 */
                if (iip && iip->ili_last_lsn) {
-                       xfs_log_force(mp, iip->ili_last_lsn,
-                                       XFS_LOG_FORCE | XFS_LOG_SYNC);
+                       error = _xfs_log_force(mp, iip->ili_last_lsn,
+                                       XFS_LOG_FORCE | XFS_LOG_SYNC, NULL);
                } else if (xfs_ipincount(ip) > 0) {
-                       xfs_log_force(mp, (xfs_lsn_t)0,
-                                       XFS_LOG_FORCE | XFS_LOG_SYNC);
+                       error = _xfs_log_force(mp, (xfs_lsn_t)0,
+                                       XFS_LOG_FORCE | XFS_LOG_SYNC, NULL);
                }
 
        } else {