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[Cluster-devel] [PATCH] gfs2: lockdump improvements



[PATCH] gfs2: lockdump improvements

The patch below consists of the following changes (in code order):

1. I fixed a minor compiler warning regarding the printing of
  a kernel symbol address.
2. I implemented a suggestion from Dave Teigland that moves
  the debugfs information for gfs2 into a subdirectory so
  we can easily expand our use of debugfs in the future.
  The current code keeps the glock information in:
  /debug/gfs2/<fs>
  With the patch, the new code keeps the glock information in:
  /debug/gfs2/<fs>/glock
  That will allow us to create more debugfs files in the future.
3. This fixes a bug whereby a failed mount attempt causes the
  debugfs file to not be deleted.  Failed mount attempts should
always clean up after themselves, including deleting the debugfs file and/or directory.

Signed-off-by: Bob Peterson <rpeterso redhat com>

fs/gfs2/glock.c      |   26 ++++++++++++++++++--------
fs/gfs2/incore.h     |    3 ++-
fs/gfs2/ops_fstype.c |    1 +
3 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index b075f93..7988715 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1774,7 +1774,7 @@ static void gfs2_print_symbol(struct glock_iter *gi, const char *fmt,

	if (gi) {
		memset(buffer, 0, sizeof(buffer));
-		sprintf(buffer, "%p", address);
+		sprintf(buffer, "0x%08lx", address);
		print_dbg(gi, fmt, buffer);
	}
	else
@@ -2146,11 +2146,14 @@ static const struct file_operations gfs2_debug_fops = {

int gfs2_create_debugfs_file(struct gfs2_sbd *sdp)
{
-	sdp->debugfs_dentry = debugfs_create_file(sdp->sd_table_name,
-						  S_IFREG | S_IRUGO,
-						  gfs2_root, sdp,
-						  &gfs2_debug_fops);
-	if (!sdp->debugfs_dentry)
+	sdp->debugfs_dir = debugfs_create_dir(sdp->sd_table_name, gfs2_root);
+	if (!sdp->debugfs_dir)
+		return -ENOMEM;
+	sdp->debugfs_dentry_glocks = debugfs_create_file("glocks",
+							 S_IFREG | S_IRUGO,
+							 sdp->debugfs_dir, sdp,
+							 &gfs2_debug_fops);
+	if (!sdp->debugfs_dentry_glocks)
		return -ENOMEM;

	return 0;
@@ -2158,8 +2161,14 @@ int gfs2_create_debugfs_file(struct gfs2_sbd *sdp)

void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp)
{
-	if (sdp && sdp->debugfs_dentry)
-		debugfs_remove(sdp->debugfs_dentry);
+	if (sdp && sdp->debugfs_dir) {
+		if (sdp->debugfs_dentry_glocks) {
+			debugfs_remove(sdp->debugfs_dentry_glocks);
+			sdp->debugfs_dentry_glocks = NULL;
+		}
+		debugfs_remove(sdp->debugfs_dir);
+		sdp->debugfs_dir = NULL;
+	}
}

int gfs2_register_debugfs(void)
@@ -2171,4 +2180,5 @@ int gfs2_register_debugfs(void)
void gfs2_unregister_debugfs(void)
{
	debugfs_remove(gfs2_root);
+	gfs2_root = NULL;
}
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index fdf0470..d995441 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -609,7 +609,8 @@ struct gfs2_sbd {

	unsigned long sd_last_warning;
	struct vfsmount *sd_gfs2mnt;
-	struct dentry *debugfs_dentry; /* for debugfs */
+	struct dentry *debugfs_dir;    /* debugfs directory */
+	struct dentry *debugfs_dentry_glocks; /* for debugfs */
};

#endif /* __INCORE_DOT_H__ */
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index ecb8b18..2c5f8e7 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -756,6 +756,7 @@ fail_lm:
fail_sys:
	gfs2_sys_fs_del(sdp);
fail:
+	gfs2_delete_debugfs_file(sdp);
	kfree(sdp);
	sb->s_fs_info = NULL;
	return error;


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