[01/16] xfs: create debugfs uuid aliases

Commit Message

Darrick J. Wong Dec. 31, 2024, 11:39 p.m. UTC

From: Darrick J. Wong <[e-mail]>

Create an alias for the debugfs dir so that we can find a filesystem by
uuid.  Unless it's mounted nouuid.

Signed-off-by: "Darrick J. Wong" <[e-mail]>
---
 fs/xfs/xfs_mount.h |    1 +
 fs/xfs/xfs_super.c |   11 +++++++++++
 2 files changed, 12 insertions(+)

Patch

diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 87007d9de5d9d0..d73e76e36bfc10 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -292,6 +292,7 @@  typedef struct xfs_mount {
 	struct delayed_work	m_reclaim_work;	/* background inode reclaim */
 	struct xfs_zone_info	*m_zone_info;	/* zone allocator information */
 	struct dentry		*m_debugfs;	/* debugfs parent */
+	struct dentry		*m_debugfs_uuid; /* debugfs symlink */
 	struct xfs_kobj		m_kobj;
 	struct xfs_kobj		m_error_kobj;
 	struct xfs_kobj		m_error_meta_kobj;
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 099c30339e8f9d..fd641853fe3595 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -780,6 +780,7 @@  xfs_mount_free(
 	if (mp->m_ddev_targp)
 		xfs_free_buftarg(mp->m_ddev_targp);
 
+	debugfs_remove(mp->m_debugfs_uuid);
 	debugfs_remove(mp->m_debugfs);
 	kfree(mp->m_rtname);
 	kfree(mp->m_logname);
@@ -1893,6 +1894,16 @@  xfs_fs_fill_super(
 		goto out_unmount;
 	}
 
+	if (xfs_debugfs && mp->m_debugfs && !xfs_has_nouuid(mp)) {
+		char	name[UUID_STRING_LEN + 1];
+
+		snprintf(name, UUID_STRING_LEN + 1, "%pU", &mp->m_sb.sb_uuid);
+		mp->m_debugfs_uuid = debugfs_create_symlink(name, xfs_debugfs,
+				mp->m_super->s_id);
+	} else {
+		mp->m_debugfs_uuid = NULL;
+	}
+
 	return 0;
 
  out_filestream_unmount: