GFS2: Add "-o errors=panic|withdraw" mount options

This patch adds "-o errors=panic" and "-o errors=withdraw" to the
gfs2 mount options.  The "errors=withdraw" option is today's
current behaviour, meaning to withdraw from the file system if a
non-serious gfs2 error occurs.  The new "errors=panic" option
tells gfs2 to force a kernel panic if a non-serious gfs2 file
system error occurs.  This may be useful, for example, where
fabric-level fencing is used that has no way to reboot (such as
fence_scsi).

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 27 insertions, 14 deletions

diff --git a/fs/gfs2/util.c b/fs/gfs2/util.c
index 9d12b1118ba0..f6a7efa34eb9 100644
--- a/fs/gfs2/util.c
+++ b/fs/gfs2/util.c
@@ -38,24 +38,30 @@ int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
         const struct lm_lockops *lm = ls->ls_ops;
         va_list args;
 
-        if (test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
+        if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
+            test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
                 return 0;
 
         va_start(args, fmt);
         vprintk(fmt, args);
         va_end(args);
 
-        fs_err(sdp, "about to withdraw this file system\n");
-        BUG_ON(sdp->sd_args.ar_debug);
+        if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
+                fs_err(sdp, "about to withdraw this file system\n");
+                BUG_ON(sdp->sd_args.ar_debug);
 
-        kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
+                kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
 
-        if (lm->lm_unmount) {
-                fs_err(sdp, "telling LM to unmount\n");
-                lm->lm_unmount(sdp);
+                if (lm->lm_unmount) {
+                        fs_err(sdp, "telling LM to unmount\n");
+                        lm->lm_unmount(sdp);
+                }
+                fs_err(sdp, "withdrawn\n");
+                dump_stack();
         }
-        fs_err(sdp, "withdrawn\n");
-        dump_stack();
+
+        if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
+                panic("GFS2: fsid=%s: panic requested.\n", sdp->sd_fsname);
 
         return -1;
 }
@@ -93,17 +99,24 @@ int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
                         gfs2_tune_get(sdp, gt_complain_secs) * HZ))
                 return -2;
 
-        printk(KERN_WARNING
-               "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
-               "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
-               sdp->sd_fsname, assertion,
-               sdp->sd_fsname, function, file, line);
+        if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
+                printk(KERN_WARNING
+                       "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
+                       "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
+                       sdp->sd_fsname, assertion,
+                       sdp->sd_fsname, function, file, line);
 
         if (sdp->sd_args.ar_debug)
                 BUG();
         else
                 dump_stack();
 
+        if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
+                panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
+                      "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
+                      sdp->sd_fsname, assertion,
+                      sdp->sd_fsname, function, file, line);
+
         sdp->sd_last_warning = jiffies;
 
         return -1;