[XFS] implement semi-generic xfs_btree_new_root
From: Dave Chinner <dgc@sgi.com>
Add a xfs_btree_new_root helper for the alloc and ialloc btrees. The bmap
btree needs it's own version and is not converted.
[hch: split out from bigger patch and minor adaptions]
SGI-PV: 985583
SGI-Modid: xfs-linux-melb:xfs-kern:32200a
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>
diff --git a/fs/xfs/xfs_ialloc_btree.c b/fs/xfs/xfs_ialloc_btree.c
index c76190a..7ba3c7b 100644
--- a/fs/xfs/xfs_ialloc_btree.c
+++ b/fs/xfs/xfs_ialloc_btree.c
@@ -44,7 +44,6 @@
STATIC void xfs_inobt_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int);
STATIC void xfs_inobt_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
STATIC void xfs_inobt_log_recs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
-STATIC int xfs_inobt_newroot(xfs_btree_cur_t *, int *);
/*
* Single level of the xfs_inobt_delete record deletion routine.
@@ -556,7 +555,7 @@
* and we're done.
*/
if (level >= cur->bc_nlevels) {
- error = xfs_inobt_newroot(cur, &i);
+ error = xfs_btree_new_root(cur, &i);
*bnop = NULLAGBLOCK;
*stat = i;
return error;
@@ -827,152 +826,6 @@
xfs_trans_log_buf(cur->bc_tp, bp, first, last);
}
-/*
- * Allocate a new root block, fill it in.
- */
-STATIC int /* error */
-xfs_inobt_newroot(
- xfs_btree_cur_t *cur, /* btree cursor */
- int *stat) /* success/failure */
-{
- xfs_agi_t *agi; /* a.g. inode header */
- xfs_alloc_arg_t args; /* allocation argument structure */
- xfs_inobt_block_t *block; /* one half of the old root block */
- xfs_buf_t *bp; /* buffer containing block */
- int error; /* error return value */
- xfs_inobt_key_t *kp; /* btree key pointer */
- xfs_agblock_t lbno; /* left block number */
- xfs_buf_t *lbp; /* left buffer pointer */
- xfs_inobt_block_t *left; /* left btree block */
- xfs_buf_t *nbp; /* new (root) buffer */
- xfs_inobt_block_t *new; /* new (root) btree block */
- int nptr; /* new value for key index, 1 or 2 */
- xfs_inobt_ptr_t *pp; /* btree address pointer */
- xfs_agblock_t rbno; /* right block number */
- xfs_buf_t *rbp; /* right buffer pointer */
- xfs_inobt_block_t *right; /* right btree block */
- xfs_inobt_rec_t *rp; /* btree record pointer */
-
- ASSERT(cur->bc_nlevels < XFS_IN_MAXLEVELS(cur->bc_mp));
-
- /*
- * Get a block & a buffer.
- */
- 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.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;
- args.minlen = args.maxlen = args.prod = 1;
- args.type = XFS_ALLOCTYPE_NEAR_BNO;
- if ((error = xfs_alloc_vextent(&args)))
- return error;
- /*
- * None available, we fail.
- */
- if (args.fsbno == NULLFSBLOCK) {
- *stat = 0;
- return 0;
- }
- ASSERT(args.len == 1);
- nbp = xfs_btree_get_bufs(args.mp, args.tp, args.agno, args.agbno, 0);
- new = XFS_BUF_TO_INOBT_BLOCK(nbp);
- /*
- * Set the root data in the a.g. inode structure.
- */
- agi->agi_root = cpu_to_be32(args.agbno);
- be32_add_cpu(&agi->agi_level, 1);
- 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
- * root, and the new block generated when it was split.
- * We don't know which one the cursor is pointing at, so we
- * set up variables "left" and "right" for each case.
- */
- bp = cur->bc_bufs[cur->bc_nlevels - 1];
- block = XFS_BUF_TO_INOBT_BLOCK(bp);
-#ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, block, cur->bc_nlevels - 1, bp)))
- return error;
-#endif
- if (be32_to_cpu(block->bb_rightsib) != NULLAGBLOCK) {
- /*
- * Our block is left, pick up the right block.
- */
- lbp = bp;
- lbno = XFS_DADDR_TO_AGBNO(args.mp, XFS_BUF_ADDR(lbp));
- left = block;
- rbno = be32_to_cpu(left->bb_rightsib);
- if ((error = xfs_btree_read_bufs(args.mp, args.tp, args.agno,
- rbno, 0, &rbp, XFS_INO_BTREE_REF)))
- return error;
- bp = rbp;
- right = XFS_BUF_TO_INOBT_BLOCK(rbp);
- if ((error = xfs_btree_check_sblock(cur, right,
- cur->bc_nlevels - 1, rbp)))
- return error;
- nptr = 1;
- } else {
- /*
- * Our block is right, pick up the left block.
- */
- rbp = bp;
- rbno = XFS_DADDR_TO_AGBNO(args.mp, XFS_BUF_ADDR(rbp));
- right = block;
- lbno = be32_to_cpu(right->bb_leftsib);
- if ((error = xfs_btree_read_bufs(args.mp, args.tp, args.agno,
- lbno, 0, &lbp, XFS_INO_BTREE_REF)))
- return error;
- bp = lbp;
- left = XFS_BUF_TO_INOBT_BLOCK(lbp);
- if ((error = xfs_btree_check_sblock(cur, left,
- cur->bc_nlevels - 1, lbp)))
- return error;
- nptr = 2;
- }
- /*
- * Fill in the new block's btree header and log it.
- */
- new->bb_magic = cpu_to_be32(xfs_magics[cur->bc_btnum]);
- new->bb_level = cpu_to_be16(cur->bc_nlevels);
- new->bb_numrecs = cpu_to_be16(2);
- new->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
- new->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
- xfs_inobt_log_block(args.tp, nbp, XFS_BB_ALL_BITS);
- ASSERT(lbno != NULLAGBLOCK && rbno != NULLAGBLOCK);
- /*
- * Fill in the key data in the new root.
- */
- kp = XFS_INOBT_KEY_ADDR(new, 1, cur);
- if (be16_to_cpu(left->bb_level) > 0) {
- kp[0] = *XFS_INOBT_KEY_ADDR(left, 1, cur);
- kp[1] = *XFS_INOBT_KEY_ADDR(right, 1, cur);
- } else {
- rp = XFS_INOBT_REC_ADDR(left, 1, cur);
- kp[0].ir_startino = rp->ir_startino;
- rp = XFS_INOBT_REC_ADDR(right, 1, cur);
- kp[1].ir_startino = rp->ir_startino;
- }
- xfs_inobt_log_keys(cur, nbp, 1, 2);
- /*
- * Fill in the pointer data in the new root.
- */
- pp = XFS_INOBT_PTR_ADDR(new, 1, cur);
- pp[0] = cpu_to_be32(lbno);
- pp[1] = cpu_to_be32(rbno);
- xfs_inobt_log_ptrs(cur, nbp, 1, 2);
- /*
- * Fix up the cursor.
- */
- xfs_btree_setbuf(cur, cur->bc_nlevels, nbp);
- cur->bc_ptrs[cur->bc_nlevels] = nptr;
- cur->bc_nlevels++;
- *stat = 1;
- return 0;
-}
/*
* Externally visible routines.
@@ -1128,6 +981,20 @@
cur->bc_private.a.agbp, cur->bc_private.a.agno);
}
+STATIC void
+xfs_inobt_set_root(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_ptr *nptr,
+ int inc) /* level change */
+{
+ struct xfs_buf *agbp = cur->bc_private.a.agbp;
+ struct xfs_agi *agi = XFS_BUF_TO_AGI(agbp);
+
+ agi->agi_root = nptr->s;
+ be32_add_cpu(&agi->agi_level, inc);
+ xfs_ialloc_log_agi(cur->bc_tp, agbp, XFS_AGI_ROOT | XFS_AGI_LEVEL);
+}
+
STATIC int
xfs_inobt_alloc_block(
struct xfs_btree_cur *cur,
@@ -1281,6 +1148,7 @@
.key_len = sizeof(xfs_inobt_key_t),
.dup_cursor = xfs_inobt_dup_cursor,
+ .set_root = xfs_inobt_set_root,
.alloc_block = xfs_inobt_alloc_block,
.get_maxrecs = xfs_inobt_get_maxrecs,
.init_key_from_rec = xfs_inobt_init_key_from_rec,