[02/41] libxfs: load metadata directory root at mount time

Commit Message

Darrick J. Wong Dec. 23, 2024, 9:47 p.m. UTC

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

Load the metadata directory root inode into memory at mount time and
release it at unmount time.

Signed-off-by: "Darrick J. Wong" <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
---
 include/xfs_mount.h |    1 +
 libxfs/init.c       |   26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

Patch

diff --git a/include/xfs_mount.h b/include/xfs_mount.h
index c7fada9e2a6d70..6daf3f01ffa9cf 100644
--- a/include/xfs_mount.h
+++ b/include/xfs_mount.h
@@ -91,6 +91,7 @@  typedef struct xfs_mount {
 	uint8_t			*m_rsum_cache;
 	struct xfs_inode	*m_rbmip;	/* pointer to bitmap inode */
 	struct xfs_inode	*m_rsumip;	/* pointer to summary inode */
+	struct xfs_inode	*m_metadirip;	/* ptr to metadata directory */
 	struct xfs_buftarg	*m_ddev_targp;
 	struct xfs_buftarg	*m_logdev_targp;
 	struct xfs_buftarg	*m_rtdev_targp;
diff --git a/libxfs/init.c b/libxfs/init.c
index beb58706629d23..bf488c5d8533b1 100644
--- a/libxfs/init.c
+++ b/libxfs/init.c
@@ -619,6 +619,27 @@  libxfs_compute_all_maxlevels(
 
 }
 
+/* Mount the metadata files under the metadata directory tree. */
+STATIC void
+libxfs_mount_setup_metadir(
+	struct xfs_mount	*mp)
+{
+	int			error;
+
+	/* Ignore filesystems that are under construction. */
+	if (mp->m_sb.sb_inprogress)
+		return;
+
+	error = -libxfs_metafile_iget(mp, mp->m_sb.sb_metadirino,
+			XFS_METAFILE_DIR, &mp->m_metadirip);
+	if (error) {
+		fprintf(stderr,
+ _("%s: Failed to load metadir root directory, error %d\n"),
+					progname, error);
+		return;
+	}
+}
+
 /*
  * precalculate the low space thresholds for dynamic speculative preallocation.
  */
@@ -800,6 +821,9 @@  libxfs_mount(
 	}
 	xfs_set_perag_data_loaded(mp);
 
+	if (xfs_has_metadir(mp))
+		libxfs_mount_setup_metadir(mp);
+
 	return mp;
 out_da:
 	xfs_da_unmount(mp);
@@ -918,6 +942,8 @@  libxfs_umount(
 	int			error;
 
 	libxfs_rtmount_destroy(mp);
+	if (mp->m_metadirip)
+		libxfs_irele(mp->m_metadirip);
 
 	/*
 	 * Purge the buffer cache to write all dirty buffers to disk and free