From: Darrick J. Wong <djwong@kernel.org>
Date: Wed, 29 May 2024 04:11:27 +0000 (-0700)
Subject: xfs: refactor creation of bmap btree roots
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=1ec2924df9b8cdc6feff1440363fef27724986c9;p=users%2Fhch%2Fmisc.git

xfs: refactor creation of bmap btree roots

Now that we've created inode fork helpers to allocate and free btree
roots, create a new bmap btree helper to create a new bmbt root, and
refactor the extents <-> btree conversion functions to use our new
helpers.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---

diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 60bdbb31caab..7f95e2ec6a66 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -615,7 +615,7 @@ xfs_bmap_btree_to_extents(
 	xfs_trans_binval(tp, cbp);
 	if (cur->bc_levels[0].bp == cbp)
 		cur->bc_levels[0].bp = NULL;
-	xfs_iroot_realloc(ip, -1, whichfork);
+	xfs_iroot_free(ip, whichfork);
 	ASSERT(ifp->if_broot == NULL);
 	ifp->if_format = XFS_DINODE_FMT_EXTENTS;
 	*logflagsp |= XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
@@ -656,19 +656,10 @@ xfs_bmap_extents_to_btree(
 	ASSERT(ifp->if_format == XFS_DINODE_FMT_EXTENTS);
 
 	/*
-	 * Make space in the inode incore. This needs to be undone if we fail
-	 * to expand the root.
-	 */
-	xfs_iroot_realloc(ip, 1, whichfork);
-
-	/*
-	 * Fill in the root.
-	 */
-	block = ifp->if_broot;
-	xfs_bmbt_init_block(ip, block, NULL, 1, 1);
-	/*
-	 * Need a cursor.  Can't allocate until bb_level is filled in.
+	 * Fill in the root, create a cursor.  Can't allocate until bb_level is
+	 * filled in.
 	 */
+	xfs_bmbt_iroot_alloc(ip, whichfork);
 	cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
 	if (wasdel)
 		cur->bc_flags |= XFS_BTREE_BMBT_WASDEL;
@@ -725,6 +716,7 @@ xfs_bmap_extents_to_btree(
 	/*
 	 * Fill in the root key and pointer.
 	 */
+	block = ifp->if_broot;
 	kp = xfs_bmbt_key_addr(mp, block, 1);
 	arp = xfs_bmbt_rec_addr(mp, ablock, 1);
 	kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
@@ -746,7 +738,7 @@ xfs_bmap_extents_to_btree(
 out_unreserve_dquot:
 	xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
 out_root_realloc:
-	xfs_iroot_realloc(ip, -1, whichfork);
+	xfs_iroot_free(ip, whichfork);
 	ifp->if_format = XFS_DINODE_FMT_EXTENTS;
 	ASSERT(ifp->if_broot == NULL);
 	xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
diff --git a/fs/xfs/libxfs/xfs_bmap_btree.c b/fs/xfs/libxfs/xfs_bmap_btree.c
index 3695b3ad07d4..bbcf099d8cf3 100644
--- a/fs/xfs/libxfs/xfs_bmap_btree.c
+++ b/fs/xfs/libxfs/xfs_bmap_btree.c
@@ -759,3 +759,18 @@ xfs_bmbt_destroy_cur_cache(void)
 	kmem_cache_destroy(xfs_bmbt_cur_cache);
 	xfs_bmbt_cur_cache = NULL;
 }
+
+/* Create an incore bmbt btree root block. */
+void
+xfs_bmbt_iroot_alloc(
+	struct xfs_inode	*ip,
+	int			whichfork)
+{
+	struct xfs_ifork	*ifp = xfs_ifork_ptr(ip, whichfork);
+
+	xfs_iroot_alloc(ip, whichfork,
+			xfs_bmap_broot_space_calc(ip->i_mount, 1));
+
+	/* Fill in the root. */
+	xfs_bmbt_init_block(ip, ifp->if_broot, NULL, 1, 1);
+}
diff --git a/fs/xfs/libxfs/xfs_bmap_btree.h b/fs/xfs/libxfs/xfs_bmap_btree.h
index af47174fca08..921c3e02469d 100644
--- a/fs/xfs/libxfs/xfs_bmap_btree.h
+++ b/fs/xfs/libxfs/xfs_bmap_btree.h
@@ -197,4 +197,6 @@ xfs_bmap_bmdr_space(struct xfs_btree_block *bb)
 	return xfs_bmdr_space_calc(be16_to_cpu(bb->bb_numrecs));
 }
 
+void xfs_bmbt_iroot_alloc(struct xfs_inode *ip, int whichfork);
+
 #endif	/* __XFS_BMAP_BTREE_H__ */