[PATCH 02/15] use the same btree_cur union member for alloc and inobt trees

Christoph Hellwig
2008-07-23T20:07:32Z

[-- Attachment #1: xfs-btree-cur-unification --]
[-- Type: text/plain, Size: 8556 bytes --]

The alloc and inobt btree use the same agbp/agno pair in the btree_cur
union. Make them use the same bc_private.a union member so that code
for these two short form btree implementations can be shared.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: linux-2.6-xfs/fs/xfs/xfs_btree.h
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_btree.h 2008-07-16 03:02:04.000000000 +0200
+++ linux-2.6-xfs/fs/xfs/xfs_btree.h 2008-07-16 03:24:19.000000000 +0200
@@ -158,8 +158,8 @@ typedef struct xfs_btree_cur
__uint8_t bc_blocklog; /* log2(blocksize) of btree blocks */
xfs_btnum_t bc_btnum; /* identifies which btree type */
union {
- struct { /* needed for BNO, CNT */
- struct xfs_buf *agbp; /* agf buffer pointer */
+ struct { /* needed for BNO, CNT, INO */
+ struct xfs_buf *agbp; /* agf/agi buffer pointer */
xfs_agnumber_t agno; /* ag number */
} a;
struct { /* needed for BMAP */
@@ -172,10 +172,6 @@ typedef struct xfs_btree_cur
char flags; /* flags */
#define XFS_BTCUR_BPRV_WASDEL 1 /* was delayed */
} b;
- struct { /* needed for INO */
- struct xfs_buf *agbp; /* agi buffer pointer */
- xfs_agnumber_t agno; /* ag number */
- } i;
} bc_private; /* per-btree type data */
} xfs_btree_cur_t;

Index: linux-2.6-xfs/fs/xfs/xfs_btree.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_btree.c 2008-07-16 03:24:18.000000000 +0200
+++ linux-2.6-xfs/fs/xfs/xfs_btree.c 2008-07-16 03:24:19.000000000 +0200
@@ -570,6 +570,13 @@ xfs_btree_init_cursor(
cur->bc_private.a.agbp = agbp;
cur->bc_private.a.agno = agno;
break;
+ case XFS_BTNUM_INO:
+ /*
+ * Inode allocation btree fields.
+ */
+ cur->bc_private.a.agbp = agbp;
+ cur->bc_private.a.agno = agno;
+ break;
case XFS_BTNUM_BMAP:
/*
* Bmap btree fields.
@@ -582,13 +589,6 @@ xfs_btree_init_cursor(
cur->bc_private.b.flags = 0;
cur->bc_private.b.whichfork = whichfork;
break;
- case XFS_BTNUM_INO:
- /*
- * Inode allocation btree fields.
- */
- cur->bc_private.i.agbp = agbp;
- cur->bc_private.i.agno = agno;
- break;
default:
ASSERT(0);
}
@@ -863,12 +863,12 @@ xfs_btree_readahead_core(
case XFS_BTNUM_INO:
i = XFS_BUF_TO_INOBT_BLOCK(cur->bc_bufs[lev]);
if ((lr & XFS_BTCUR_LEFTRA) && be32_to_cpu(i->bb_leftsib) != NULLAGBLOCK) {
- xfs_btree_reada_bufs(cur->bc_mp, cur->bc_private.i.agno,
+ xfs_btree_reada_bufs(cur->bc_mp, cur->bc_private.a.agno,
be32_to_cpu(i->bb_leftsib), 1);
rval++;
}
if ((lr & XFS_BTCUR_RIGHTRA) && be32_to_cpu(i->bb_rightsib) != NULLAGBLOCK) {
- xfs_btree_reada_bufs(cur->bc_mp, cur->bc_private.i.agno,
+ xfs_btree_reada_bufs(cur->bc_mp, cur->bc_private.a.agno,
be32_to_cpu(i->bb_rightsib), 1);
rval++;
}
Index: linux-2.6-xfs/fs/xfs/xfs_ialloc_btree.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_ialloc_btree.c 2008-07-16 03:02:04.000000000 +0200
+++ linux-2.6-xfs/fs/xfs/xfs_ialloc_btree.c 2008-07-16 03:24:19.000000000 +0200
@@ -181,7 +181,7 @@ xfs_inobt_delrec(
* then we can get rid of this level.
*/
if (numrecs == 1 && level > 0) {
- agbp = cur->bc_private.i.agbp;
+ agbp = cur->bc_private.a.agbp;
agi = XFS_BUF_TO_AGI(agbp);
/*
* pp is still set to the first pointer in the block.
@@ -194,7 +194,7 @@ xfs_inobt_delrec(
* Free the block.
*/
if ((error = xfs_free_extent(cur->bc_tp,
- XFS_AGB_TO_FSB(mp, cur->bc_private.i.agno, bno), 1)))
+ XFS_AGB_TO_FSB(mp, cur->bc_private.a.agno, bno), 1)))
return error;
xfs_trans_binval(cur->bc_tp, bp);
xfs_ialloc_log_agi(cur->bc_tp, agbp,
@@ -379,7 +379,7 @@ xfs_inobt_delrec(
rrecs = be16_to_cpu(right->bb_numrecs);
rbp = bp;
if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
- cur->bc_private.i.agno, lbno, 0, &lbp,
+ cur->bc_private.a.agno, lbno, 0, &lbp,
XFS_INO_BTREE_REF)))
return error;
left = XFS_BUF_TO_INOBT_BLOCK(lbp);
@@ -401,7 +401,7 @@ xfs_inobt_delrec(
lrecs = be16_to_cpu(left->bb_numrecs);
lbp = bp;
if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
- cur->bc_private.i.agno, rbno, 0, &rbp,
+ cur->bc_private.a.agno, rbno, 0, &rbp,
XFS_INO_BTREE_REF)))
return error;
right = XFS_BUF_TO_INOBT_BLOCK(rbp);
@@ -484,7 +484,7 @@ xfs_inobt_delrec(
xfs_buf_t *rrbp;

if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
- cur->bc_private.i.agno, be32_to_cpu(left->bb_rightsib), 0,
+ cur->bc_private.a.agno, be32_to_cpu(left->bb_rightsib), 0,
&rrbp, XFS_INO_BTREE_REF)))
return error;
rrblock = XFS_BUF_TO_INOBT_BLOCK(rrbp);
@@ -497,7 +497,7 @@ xfs_inobt_delrec(
* Free the deleting block.
*/
if ((error = xfs_free_extent(cur->bc_tp, XFS_AGB_TO_FSB(mp,
- cur->bc_private.i.agno, rbno), 1)))
+ cur->bc_private.a.agno, rbno), 1)))
return error;
xfs_trans_binval(cur->bc_tp, rbp);
/*
@@ -854,7 +854,7 @@ xfs_inobt_lookup(
{
xfs_agi_t *agi; /* a.g. inode header */

- agi = XFS_BUF_TO_AGI(cur->bc_private.i.agbp);
+ agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp);
agno = be32_to_cpu(agi->agi_seqno);
agbno = be32_to_cpu(agi->agi_root);
}
@@ -1089,7 +1089,7 @@ xfs_inobt_lshift(
* Set up the left neighbor as "left".
*/
if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
- cur->bc_private.i.agno, be32_to_cpu(right->bb_leftsib),
+ cur->bc_private.a.agno, be32_to_cpu(right->bb_leftsib),
0, &lbp, XFS_INO_BTREE_REF)))
return error;
left = XFS_BUF_TO_INOBT_BLOCK(lbp);
@@ -1207,10 +1207,10 @@ xfs_inobt_newroot(
/*
* Get a block & a buffer.
*/
- agi = XFS_BUF_TO_AGI(cur->bc_private.i.agbp);
+ agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp);
args.tp = cur->bc_tp;
args.mp = cur->bc_mp;
- args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.i.agno,
+ args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.a.agno,
be32_to_cpu(agi->agi_root));
args.mod = args.minleft = args.alignment = args.total = args.wasdel =
args.isfl = args.userdata = args.minalignslop = 0;
@@ -1233,7 +1233,7 @@ xfs_inobt_newroot(
*/
agi->agi_root = cpu_to_be32(args.agbno);
be32_add(&agi->agi_level, 1);
- xfs_ialloc_log_agi(args.tp, cur->bc_private.i.agbp,
+ xfs_ialloc_log_agi(args.tp, cur->bc_private.a.agbp,
XFS_AGI_ROOT | XFS_AGI_LEVEL);
/*
* At the previous root level there are now two blocks: the old
@@ -1376,7 +1376,7 @@ xfs_inobt_rshift(
* Set up the right neighbor as "right".
*/
if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
- cur->bc_private.i.agno, be32_to_cpu(left->bb_rightsib),
+ cur->bc_private.a.agno, be32_to_cpu(left->bb_rightsib),
0, &rbp, XFS_INO_BTREE_REF)))
return error;
right = XFS_BUF_TO_INOBT_BLOCK(rbp);
@@ -1492,7 +1492,7 @@ xfs_inobt_split(
* Allocate the new block.
* If we can't do it, we're toast. Give up.
*/
- args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.i.agno, lbno);
+ args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.a.agno, lbno);
args.mod = args.minleft = args.alignment = args.total = args.wasdel =
args.isfl = args.userdata = args.minalignslop = 0;
args.minlen = args.maxlen = args.prod = 1;
@@ -1725,7 +1725,7 @@ xfs_inobt_decrement(

agbno = be32_to_cpu(*XFS_INOBT_PTR_ADDR(block, cur->bc_ptrs[lev], cur));
if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
- cur->bc_private.i.agno, agbno, 0, &bp,
+ cur->bc_private.a.agno, agbno, 0, &bp,
XFS_INO_BTREE_REF)))
return error;
lev--;
@@ -1897,7 +1897,7 @@ xfs_inobt_increment(

agbno = be32_to_cpu(*XFS_INOBT_PTR_ADDR(block, cur->bc_ptrs[lev], cur));
if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
- cur->bc_private.i.agno, agbno, 0, &bp,
+ cur->bc_private.a.agno, agbno, 0, &bp,
XFS_INO_BTREE_REF)))
return error;
lev--;
Index: linux-2.6-xfs/fs/xfs/xfsidbg.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfsidbg.c 2008-07-16 03:29:49.000000000 +0200
+++ linux-2.6-xfs/fs/xfs/xfsidbg.c 2008-07-16 03:30:17.000000000 +0200
@@ -4579,10 +4579,6 @@ xfsidbg_xbtcur(xfs_btree_cur_t *c)
xfs_fmtfsblock(c->bc_private.b.firstblock, c->bc_mp),
c->bc_private.b.flist,
c->bc_private.b.allocated);
- } else if (c->bc_btnum == XFS_BTNUM_INO) {
- kdb_printf("private agbp 0x%p agno 0x%x\n",
- c->bc_private.i.agbp,
- c->bc_private.i.agno);
} else {
kdb_printf("private agbp 0x%p agno 0x%x\n",
c->bc_private.a.agbp,

--