From 8df4da4a0a642d3a016028c0d922bcb4d5a4a6d7 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 30 Oct 2008 16:55:58 +1100 Subject: [XFS] implement generic xfs_btree_decrement From: Dave Chinner [hch: split out from bigger patch and minor adaptions] SGI-PV: 985583 SGI-Modid: xfs-linux-melb:xfs-kern:32191a Signed-off-by: Christoph Hellwig Signed-off-by: Lachlan McIlroy Signed-off-by: Bill O'Donnell Signed-off-by: David Chinner --- fs/xfs/xfs_ialloc_btree.c | 98 ++++------------------------------------------- 1 file changed, 7 insertions(+), 91 deletions(-) (limited to 'fs/xfs/xfs_ialloc_btree.c') diff --git a/fs/xfs/xfs_ialloc_btree.c b/fs/xfs/xfs_ialloc_btree.c index 41717da63696..9099a32f9972 100644 --- a/fs/xfs/xfs_ialloc_btree.c +++ b/fs/xfs/xfs_ialloc_btree.c @@ -205,7 +205,7 @@ xfs_inobt_delrec( cur->bc_bufs[level] = NULL; cur->bc_nlevels--; } else if (level > 0 && - (error = xfs_inobt_decrement(cur, level, &i))) + (error = xfs_btree_decrement(cur, level, &i))) return error; *stat = 1; return 0; @@ -222,7 +222,7 @@ xfs_inobt_delrec( */ if (numrecs >= XFS_INOBT_BLOCK_MINRECS(level, cur)) { if (level > 0 && - (error = xfs_inobt_decrement(cur, level, &i))) + (error = xfs_btree_decrement(cur, level, &i))) return error; *stat = 1; return 0; @@ -286,7 +286,7 @@ xfs_inobt_delrec( xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR); if (level > 0 && - (error = xfs_inobt_decrement(cur, level, + (error = xfs_btree_decrement(cur, level, &i))) return error; *stat = 1; @@ -301,7 +301,7 @@ xfs_inobt_delrec( rrecs = be16_to_cpu(right->bb_numrecs); if (lbno != NULLAGBLOCK) { xfs_btree_firstrec(tcur, level); - if ((error = xfs_inobt_decrement(tcur, level, &i))) + if ((error = xfs_btree_decrement(tcur, level, &i))) goto error0; } } @@ -315,7 +315,7 @@ xfs_inobt_delrec( * previous block. */ xfs_btree_firstrec(tcur, level); - if ((error = xfs_inobt_decrement(tcur, level, &i))) + if ((error = xfs_btree_decrement(tcur, level, &i))) goto error0; xfs_btree_firstrec(tcur, level); /* @@ -414,7 +414,7 @@ xfs_inobt_delrec( * Just return. This is probably a logic error, but it's not fatal. */ else { - if (level > 0 && (error = xfs_inobt_decrement(cur, level, &i))) + if (level > 0 && (error = xfs_btree_decrement(cur, level, &i))) return error; *stat = 1; return 0; @@ -1655,90 +1655,6 @@ xfs_inobt_updkey( * Externally visible routines. */ -/* - * Decrement cursor by one record at the level. - * For nonzero levels the leaf-ward information is untouched. - */ -int /* error */ -xfs_inobt_decrement( - xfs_btree_cur_t *cur, /* btree cursor */ - int level, /* level in btree, 0 is leaf */ - int *stat) /* success/failure */ -{ - xfs_inobt_block_t *block; /* btree block */ - int error; - int lev; /* btree level */ - - ASSERT(level < cur->bc_nlevels); - /* - * Read-ahead to the left at this level. - */ - xfs_btree_readahead(cur, level, XFS_BTCUR_LEFTRA); - /* - * Decrement the ptr at this level. If we're still in the block - * then we're done. - */ - if (--cur->bc_ptrs[level] > 0) { - *stat = 1; - return 0; - } - /* - * Get a pointer to the btree block. - */ - block = XFS_BUF_TO_INOBT_BLOCK(cur->bc_bufs[level]); -#ifdef DEBUG - if ((error = xfs_btree_check_sblock(cur, block, level, - cur->bc_bufs[level]))) - return error; -#endif - /* - * If we just went off the left edge of the tree, return failure. - */ - if (be32_to_cpu(block->bb_leftsib) == NULLAGBLOCK) { - *stat = 0; - return 0; - } - /* - * March up the tree decrementing pointers. - * Stop when we don't go off the left edge of a block. - */ - for (lev = level + 1; lev < cur->bc_nlevels; lev++) { - if (--cur->bc_ptrs[lev] > 0) - break; - /* - * Read-ahead the left block, we're going to read it - * in the next loop. - */ - xfs_btree_readahead(cur, lev, XFS_BTCUR_LEFTRA); - } - /* - * If we went off the root then we are seriously confused. - */ - ASSERT(lev < cur->bc_nlevels); - /* - * Now walk back down the tree, fixing up the cursor's buffer - * pointers and key numbers. - */ - for (block = XFS_BUF_TO_INOBT_BLOCK(cur->bc_bufs[lev]); lev > level; ) { - xfs_agblock_t agbno; /* block number of btree block */ - xfs_buf_t *bp; /* buffer containing btree block */ - - 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.a.agno, agbno, 0, &bp, - XFS_INO_BTREE_REF))) - return error; - lev--; - xfs_btree_setbuf(cur, lev, bp); - block = XFS_BUF_TO_INOBT_BLOCK(bp); - if ((error = xfs_btree_check_sblock(cur, block, lev, bp))) - return error; - cur->bc_ptrs[lev] = be16_to_cpu(block->bb_numrecs); - } - *stat = 1; - return 0; -} - /* * Delete the record pointed to by cur. * The cursor refers to the place where the record was (could be inserted) @@ -1765,7 +1681,7 @@ xfs_inobt_delete( if (i == 0) { for (level = 1; level < cur->bc_nlevels; level++) { if (cur->bc_ptrs[level] == 0) { - if ((error = xfs_inobt_decrement(cur, level, &i))) + if ((error = xfs_btree_decrement(cur, level, &i))) return error; break; } -- cgit v1.2.3