[27/30] libxfs: create new files with attr forks if necessary

Commit Message

Darrick J. Wong May 26, 2023, 2:28 a.m. UTC

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

Create new files with attr forks if they're going to have parent
pointers.  In the next patch we'll fix mkfs to use the same parent
creation functions as the kernel, so we're going to need this.

Signed-off-by: Darrick J. Wong <[e-mail]>
---
 libxfs/init.c |    4 ++++
 libxfs/util.c |   14 ++++++++++++++
 2 files changed, 18 insertions(+)

Patch

diff --git a/libxfs/init.c b/libxfs/init.c
index 26b578134c7..1d28c7b3824 100644
--- a/libxfs/init.c
+++ b/libxfs/init.c
@@ -819,14 +819,18 @@  void
 libxfs_compute_all_maxlevels(
 	struct xfs_mount	*mp)
 {
+	struct xfs_ino_geometry *igeo = M_IGEO(mp);
+
 	xfs_alloc_compute_maxlevels(mp);
 	xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
 	xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
+	igeo->attr_fork_offset = xfs_bmap_compute_attr_offset(mp);
 	xfs_ialloc_setup_geometry(mp);
 	xfs_rmapbt_compute_maxlevels(mp);
 	xfs_refcountbt_compute_maxlevels(mp);
 
 	xfs_agbtree_compute_maxlevels(mp);
+
 }
 
 /*
diff --git a/libxfs/util.c b/libxfs/util.c
index febbd84ab92..75166508d06 100644
--- a/libxfs/util.c
+++ b/libxfs/util.c
@@ -340,6 +340,20 @@  libxfs_init_new_inode(
 		ASSERT(0);
 	}
 
+	/*
+	 * If we need to create attributes immediately after allocating the
+	 * inode, initialise an empty attribute fork right now. We use the
+	 * default fork offset for attributes here as we don't know exactly what
+	 * size or how many attributes we might be adding. We can do this
+	 * safely here because we know the data fork is completely empty and
+	 * this saves us from needing to run a separate transaction to set the
+	 * fork offset in the immediate future.
+	 */
+	if (xfs_has_parent(tp->t_mountp) && xfs_has_attr(tp->t_mountp)) {
+		ip->i_forkoff = xfs_default_attroffset(ip) >> 3;
+		xfs_ifork_init_attr(ip, XFS_DINODE_FMT_EXTENTS, 0);
+	}
+
 	/*
 	 * Log the new values stuffed into the inode.
 	 */