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authorChristoph Hellwig <hch@infradead.org>2008-10-30 16:53:59 +1100
committerLachlan McIlroy <lachlan@sgi.com>2008-10-30 16:53:59 +1100
commit561f7d17390d00444e6cd0b02b7516c91528082e (patch)
tree59359b995320bf79a55c2f23305960b5ffe74d8f /fs/xfs/xfs_alloc_btree.c
parentf2277f06e626d694e61bb356524ff536ced24acf (diff)
[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>
Diffstat (limited to 'fs/xfs/xfs_alloc_btree.c')
-rw-r--r--fs/xfs/xfs_alloc_btree.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/fs/xfs/xfs_alloc_btree.c b/fs/xfs/xfs_alloc_btree.c
index 3ce2645508a..60c121f1e81 100644
--- a/fs/xfs/xfs_alloc_btree.c
+++ b/fs/xfs/xfs_alloc_btree.c
@@ -2209,3 +2209,48 @@ xfs_alloc_update(
}
return 0;
}
+
+STATIC struct xfs_btree_cur *
+xfs_allocbt_dup_cursor(
+ struct xfs_btree_cur *cur)
+{
+ return xfs_allocbt_init_cursor(cur->bc_mp, cur->bc_tp,
+ cur->bc_private.a.agbp, cur->bc_private.a.agno,
+ cur->bc_btnum);
+}
+
+static const struct xfs_btree_ops xfs_allocbt_ops = {
+ .dup_cursor = xfs_allocbt_dup_cursor,
+};
+
+/*
+ * Allocate a new allocation btree cursor.
+ */
+struct xfs_btree_cur * /* new alloc btree cursor */
+xfs_allocbt_init_cursor(
+ struct xfs_mount *mp, /* file system mount point */
+ struct xfs_trans *tp, /* transaction pointer */
+ struct xfs_buf *agbp, /* buffer for agf structure */
+ xfs_agnumber_t agno, /* allocation group number */
+ xfs_btnum_t btnum) /* btree identifier */
+{
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
+ struct xfs_btree_cur *cur;
+
+ ASSERT(btnum == XFS_BTNUM_BNO || btnum == XFS_BTNUM_CNT);
+
+ cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
+
+ cur->bc_tp = tp;
+ cur->bc_mp = mp;
+ cur->bc_nlevels = be32_to_cpu(agf->agf_levels[btnum]);
+ cur->bc_btnum = btnum;
+ cur->bc_blocklog = mp->m_sb.sb_blocklog;
+
+ cur->bc_ops = &xfs_allocbt_ops;
+
+ cur->bc_private.a.agbp = agbp;
+ cur->bc_private.a.agno = agno;
+
+ return cur;
+}