GFS2: Add some useful messages
The following patch adds a message to indicate when barriers have been
disabled due to a block device which doesn't support them. You could
already tell this via the mount options in /proc/mounts, but all the
other filesystems also log a message at the same time.
Also, the same mechanisms are used to indicate when the lock
demote interface has been used (only ever used for debugging)
which is a request from our support team.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 08dd657..b5d7363 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -459,6 +459,7 @@
SDF_SHUTDOWN = 2,
SDF_NOBARRIERS = 3,
SDF_NORECOVERY = 4,
+ SDF_DEMOTE = 5,
};
#define GFS2_FSNAME_LEN 256
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index d5959df..b593f0e 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -600,6 +600,7 @@
if (buffer_eopnotsupp(bh)) {
clear_buffer_eopnotsupp(bh);
set_buffer_uptodate(bh);
+ fs_info(sdp, "barrier sync failed - disabling barriers\n");
set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
lock_buffer(bh);
skip_barrier:
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 7a93e9f..4d1aad3 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -1334,7 +1334,8 @@
}
if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
seq_printf(s, ",nobarrier");
-
+ if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
+ seq_printf(s, ",demote_interface_used");
return 0;
}
diff --git a/fs/gfs2/sys.c b/fs/gfs2/sys.c
index 2ac845d..7afb62ec 100644
--- a/fs/gfs2/sys.c
+++ b/fs/gfs2/sys.c
@@ -233,6 +233,8 @@
glops = gfs2_glops_list[gltype];
if (glops == NULL)
return -EINVAL;
+ if (test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
+ fs_info(sdp, "demote interface used\n");
rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
if (rv)
return rv;
