[XFS] move xfs_bmbt_killroot to common code

xfs_bmbt_killroot is a mostly generic implementation of moving from a real
block based root to an inode based root. So move it to xfs_btree.c where
it can use all the nice infrastructure there and make it pointer size
agnostic

The new name for it is xfs_btree_kill_iroot, following the old naming but
making it clear we're dealing with the root in inode case here, and to
avoid confusion with xfs_btree_new_root which is used for the not inode
rooted case. I've also added a comment describing what it does and why
it's named the way it is.

SGI-PV: 985583

SGI-Modid: xfs-linux-melb:xfs-kern:32203a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Bill O'Donnell <billodo@sgi.com>
Signed-off-by: David Chinner <david@fromorbit.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/fs/xfs/xfs_ialloc_btree.c b/fs/xfs/xfs_ialloc_btree.c
index 8f66e2720566..90f1d4ee7720 100644
--- a/fs/xfs/xfs_ialloc_btree.c
+++ b/fs/xfs/xfs_ialloc_btree.c
@@ -754,6 +754,22 @@ xfs_inobt_alloc_block(
         return 0;
 }
 
+STATIC int
+xfs_inobt_free_block(
+        struct xfs_btree_cur    *cur,
+        struct xfs_buf          *bp)
+{
+        xfs_fsblock_t           fsbno;
+        int                     error;
+
+        fsbno = XFS_DADDR_TO_FSB(cur->bc_mp, XFS_BUF_ADDR(bp));
+        error = xfs_free_extent(cur->bc_tp, fsbno, 1);
+        if (error)
+                return error;
+
+        xfs_trans_binval(cur->bc_tp, bp);
+        return error;
+}
 
 STATIC int
 xfs_inobt_get_maxrecs(
@@ -886,6 +902,7 @@ static const struct xfs_btree_ops xfs_inobt_ops = {
         .dup_cursor             = xfs_inobt_dup_cursor,
         .set_root               = xfs_inobt_set_root,
         .alloc_block            = xfs_inobt_alloc_block,
+        .free_block             = xfs_inobt_free_block,
         .get_maxrecs            = xfs_inobt_get_maxrecs,
         .init_key_from_rec      = xfs_inobt_init_key_from_rec,
         .init_rec_from_key      = xfs_inobt_init_rec_from_key,