xfs: support leaves in the incore btree root block in xfs_iroot_realloc

Add some logic to xfs_iroot_realloc so that we can handle leaf records
in the btree root block correctly.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

5 files changed, 18 insertions, 10 deletions

diff --git a/fs/xfs/libxfs/xfs_bmap_btree.c b/fs/xfs/libxfs/xfs_bmap_btree.c
index 31652174556f..1ac85c44d65c 100644
--- a/fs/xfs/libxfs/xfs_bmap_btree.c
+++ b/fs/xfs/libxfs/xfs_bmap_btree.c
@@ -520,6 +520,7 @@ xfs_bmbt_broot_move(
 	size_t			dst_bytes,
 	struct xfs_btree_block	*src_broot,
 	size_t			src_bytes,
+	unsigned int		level,
 	unsigned int		numrecs)
 {
 	struct xfs_mount	*mp = ip->i_mount;
@@ -527,6 +528,7 @@ xfs_bmbt_broot_move(
 	void			*sptr;
 
 	ASSERT(xfs_bmap_bmdr_space(src_broot) <= XFS_IFORK_SIZE(ip, whichfork));
+	ASSERT(level > 0);
 
 	/*
 	 * We always have to move the pointers because they are not butted
@@ -798,7 +800,7 @@ xfs_bmbt_iroot_alloc(
 	struct xfs_ifork	*ifp = XFS_IFORK_PTR(ip, whichfork);
 
 	xfs_iroot_alloc(ip, whichfork,
-			xfs_bmap_broot_space_calc(ip->i_mount, 1));
+			xfs_bmap_broot_space_calc(ip->i_mount, 1, 1));
 
 	/* Fill in the root. */
 	xfs_btree_init_block_int(ip->i_mount, ifp->if_broot,
diff --git a/fs/xfs/libxfs/xfs_bmap_btree.h b/fs/xfs/libxfs/xfs_bmap_btree.h
index 6356e377f25c..61cff8474edb 100644
--- a/fs/xfs/libxfs/xfs_bmap_btree.h
+++ b/fs/xfs/libxfs/xfs_bmap_btree.h
@@ -156,8 +156,11 @@ xfs_bmap_broot_ptr_addr(
 static inline size_t
 xfs_bmap_broot_space_calc(
 	struct xfs_mount	*mp,
+	unsigned int		level,
 	unsigned int		nrecs)
 {
+	ASSERT(level > 0);
+
 	/*
 	 * If the bmbt root block is empty, we should be converting the fork
 	 * to extents format.  Hence, the size is zero.
@@ -178,7 +181,7 @@ xfs_bmap_broot_space(
 	struct xfs_mount	*mp,
 	struct xfs_bmdr_block	*bb)
 {
-	return xfs_bmap_broot_space_calc(mp, be16_to_cpu(bb->bb_numrecs));
+	return xfs_bmap_broot_space_calc(mp, 1, be16_to_cpu(bb->bb_numrecs));
 }
 
 /* Compute the space required for the ondisk root block. */
diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c
index 1e52ad127a0e..6b162b304c27 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.c
+++ b/fs/xfs/libxfs/xfs_inode_fork.c
@@ -383,6 +383,7 @@ xfs_iroot_realloc(
 	struct xfs_btree_block		*new_broot;
 	size_t				new_size;
 	size_t				old_size = ifp->if_broot_bytes;
+	unsigned int			level;
 	int				cur_max;
 	int				new_max;
 
@@ -397,16 +398,17 @@ xfs_iroot_realloc(
 	if (old_size == 0) {
 		ASSERT(rec_diff > 0);
 
-		new_size = ops->size(mp, rec_diff);
+		new_size = ops->size(mp, 0, rec_diff);
 		xfs_iroot_alloc(ip, whichfork, new_size);
 		return;
 	}
 
 	/* Compute the new and old record count and space requirements. */
-	cur_max = ops->maxrecs(mp, old_size, false);
+	level = be16_to_cpu(ifp->if_broot->bb_level);
+	cur_max = ops->maxrecs(mp, old_size, level == 0);
 	new_max = cur_max + rec_diff;
 	ASSERT(new_max >= 0);
-	new_size = ops->size(mp, new_max);
+	new_size = ops->size(mp, level, new_max);
 
 	if (rec_diff > 0) {
 		/*
@@ -418,7 +420,7 @@ xfs_iroot_realloc(
 					 GFP_NOFS | __GFP_NOFAIL);
 		ifp->if_broot_bytes = new_size;
 		ops->move(ip, whichfork, ifp->if_broot, new_size,
-				ifp->if_broot, old_size, cur_max);
+				ifp->if_broot, old_size, level, cur_max);
 		return;
 	}
 
@@ -435,7 +437,7 @@ xfs_iroot_realloc(
 	/* Reallocate the btree root and move the contents. */
 	new_broot = kmem_alloc(new_size, KM_NOFS);
 	ops->move(ip, whichfork, new_broot, new_size, ifp->if_broot,
-			ifp->if_broot_bytes, new_max);
+			ifp->if_broot_bytes, level, new_max);
 
 	kmem_free(ifp->if_broot);
 	ifp->if_broot = new_broot;
diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h
index db038dce8124..6c1542f5c14a 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.h
+++ b/fs/xfs/libxfs/xfs_inode_fork.h
@@ -184,7 +184,8 @@ struct xfs_ifork_broot_ops {
 			bool leaf);
 
 	/* Calculate the bytes required for the incore btree root block. */
-	size_t (*size)(struct xfs_mount *mp, unsigned int nrecs);
+	size_t (*size)(struct xfs_mount *mp, unsigned int level,
+			unsigned int nrecs);
 
 	/*
 	 * Move an incore btree root from one buffer to another.  Note that
@@ -194,7 +195,7 @@ struct xfs_ifork_broot_ops {
 	void (*move)(struct xfs_inode *ip, int whichfork,
 			struct xfs_btree_block *dst_broot, size_t dst_bytes,
 			struct xfs_btree_block *src_broot, size_t src_bytes,
-			unsigned int numrecs);
+			unsigned int level, unsigned int numrecs);
 };
 
 void xfs_iroot_realloc(struct xfs_inode *ip, int whichfork,
diff --git a/fs/xfs/scrub/bmap_repair.c b/fs/xfs/scrub/bmap_repair.c
index d750e693fc7f..417882991e1f 100644
--- a/fs/xfs/scrub/bmap_repair.c
+++ b/fs/xfs/scrub/bmap_repair.c
@@ -262,7 +262,7 @@ xrep_bmap_iroot_size(
 {
 	ASSERT(level > 0);
 
-	return xfs_bmap_broot_space_calc(cur->bc_mp, nr_this_level);
+	return xfs_bmap_broot_space_calc(cur->bc_mp, level, nr_this_level);
 }
 
 /* Update the inode counters. */