[XFS] split up xfs_btree_init_cursor

xfs_btree_init_cursor contains close to little shared code for the
different btrees and will get even more non-common code in the future.
Split it up into one routine per btree type.

Because xfs_btree_dup_cursor needs to call the init routine for a generic
btree cursor add a new btree operation vector that contains a dup_cursor
method that initializes a new cursor based on an existing one.

The btree operations vector is based on an idea and code from Dave Chinner
and will grow more entries later during this series.

SGI-PV: 985583

SGI-Modid: xfs-linux-melb:xfs-kern:32176a

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, 4 insertions, 8 deletions

diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c
index aad8c5da38a..11bb169561c 100644
--- a/fs/xfs/xfs_ialloc.c
+++ b/fs/xfs/xfs_ialloc.c
@@ -335,8 +335,7 @@ xfs_ialloc_ag_alloc(
         /*
          * Insert records describing the new inode chunk into the btree.
          */
-        cur = xfs_btree_init_cursor(args.mp, tp, agbp, agno,
-                        XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
+        cur = xfs_inobt_init_cursor(args.mp, tp, agbp, agno);
         for (thisino = newino;
              thisino < newino + newlen;
              thisino += XFS_INODES_PER_CHUNK) {
@@ -676,8 +675,7 @@ nextag:
          */
         agno = tagno;
         *IO_agbp = NULL;
-        cur = xfs_btree_init_cursor(mp, tp, agbp, be32_to_cpu(agi->agi_seqno),
-                                    XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
+        cur = xfs_inobt_init_cursor(mp, tp, agbp, be32_to_cpu(agi->agi_seqno));
         /*
          * If pagino is 0 (this is the root inode allocation) use newino.
          * This must work because we've just allocated some.
@@ -1022,8 +1020,7 @@ xfs_difree(
         /*
          * Initialize the cursor.
          */
-        cur = xfs_btree_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_INO,
-                (xfs_inode_t *)0, 0);
+        cur = xfs_inobt_init_cursor(mp, tp, agbp, agno);
 #ifdef DEBUG
         if (cur->bc_nlevels == 1) {
                 int freecount = 0;
@@ -1259,8 +1256,7 @@ xfs_dilocate(
 #endif /* DEBUG */
                         return error;
                 }
-                cur = xfs_btree_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_INO,
-                        (xfs_inode_t *)0, 0);
+                cur = xfs_inobt_init_cursor(mp, tp, agbp, agno);
                 if ((error = xfs_inobt_lookup_le(cur, agino, 0, 0, &i))) {
 #ifdef DEBUG
                         xfs_fs_cmn_err(CE_ALERT, mp, "xfs_dilocate: "