#define XFS_BTNUM_INO ((xfs_btnum_t)XFS_BTNUM_INOi)
/*
- * Short form header: space allocation btrees.
- */
-typedef struct xfs_btree_sblock {
- __be32 bb_magic; /* magic number for block type */
- __be16 bb_level; /* 0 is a leaf */
- __be16 bb_numrecs; /* current # of data records */
- __be32 bb_leftsib; /* left sibling block or NULLAGBLOCK */
- __be32 bb_rightsib; /* right sibling block or NULLAGBLOCK */
-} xfs_btree_sblock_t;
-
-/*
- * Long form header: bmap btrees.
- */
-typedef struct xfs_btree_lblock {
- __be32 bb_magic; /* magic number for block type */
- __be16 bb_level; /* 0 is a leaf */
- __be16 bb_numrecs; /* current # of data records */
- __be64 bb_leftsib; /* left sibling block or NULLDFSBNO */
- __be64 bb_rightsib; /* right sibling block or NULLDFSBNO */
-} xfs_btree_lblock_t;
-
-/*
- * Combined header and structure, used by common code.
+ * Generic btree header.
+ *
+ * This is a combination of the actual format used on disk for short and long
+ * format btrees. The first three fields are shared by both format, but
+ * the pointers are different and should be used with care.
+ *
+ * To get the size of the actual short or long form headers please use
+ * the size macros below. Never use sizeof(xfs_btree_block).
*/
-typedef struct xfs_btree_block {
+struct xfs_btree_block {
__be32 bb_magic; /* magic number for block type */
__be16 bb_level; /* 0 is a leaf */
__be16 bb_numrecs; /* current # of data records */
__be64 bb_rightsib;
} l; /* long form pointers */
} bb_u; /* rest */
-} xfs_btree_block_t;
+};
+
+#define XFS_BTREE_SBLOCK_LEN 16 /* size of a short form block */
+#define XFS_BTREE_LBLOCK_LEN 24 /* size of a long form block */
+
/*
* Generic key, ptr and record wrapper structures.
case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \
} \
} while (0)
-/*
- * Maximum and minimum records in a btree block.
- * Given block size, type prefix, and leaf flag (0 or 1).
- * The divisor below is equivalent to lf ? (e1) : (e2) but that produces
- * compiler warnings.
- */
-#define XFS_BTREE_BLOCK_MAXRECS(bsz,t,lf) \
- ((int)(((bsz) - (uint)sizeof(t ## _block_t)) / \
- (((lf) * (uint)sizeof(t ## _rec_t)) + \
- ((1 - (lf)) * \
- ((uint)sizeof(t ## _key_t) + (uint)sizeof(t ## _ptr_t))))))
-#define XFS_BTREE_BLOCK_MINRECS(bsz,t,lf) \
- (XFS_BTREE_BLOCK_MAXRECS(bsz,t,lf) / 2)
-
-/*
- * Record, key, and pointer address calculation macros.
- * Given block size, type prefix, block pointer, and index of requested entry
- * (first entry numbered 1).
- */
-#define XFS_BTREE_REC_ADDR(t,bb,i) \
- ((t ## _rec_t *)((char *)(bb) + sizeof(t ## _block_t) + \
- ((i) - 1) * sizeof(t ## _rec_t)))
-#define XFS_BTREE_KEY_ADDR(t,bb,i) \
- ((t ## _key_t *)((char *)(bb) + sizeof(t ## _block_t) + \
- ((i) - 1) * sizeof(t ## _key_t)))
-#define XFS_BTREE_PTR_ADDR(t,bb,i,mxr) \
- ((t ## _ptr_t *)((char *)(bb) + sizeof(t ## _block_t) + \
- (mxr) * sizeof(t ## _key_t) + ((i) - 1) * sizeof(t ## _ptr_t)))
#define XFS_BTREE_MAXLEVELS 8 /* max of all btrees */
/*
* Convert from buffer to btree block header.
*/
-#define XFS_BUF_TO_BLOCK(bp) ((xfs_btree_block_t *)XFS_BUF_PTR(bp))
-#define XFS_BUF_TO_LBLOCK(bp) ((xfs_btree_lblock_t *)XFS_BUF_PTR(bp))
-#define XFS_BUF_TO_SBLOCK(bp) ((xfs_btree_sblock_t *)XFS_BUF_PTR(bp))
-
+#define XFS_BUF_TO_BLOCK(bp) ((struct xfs_btree_block *)XFS_BUF_PTR(bp))
-/*
- * Check that long form block header is ok.
- */
-int /* error (0 or EFSCORRUPTED) */
-xfs_btree_check_lblock(
- struct xfs_btree_cur *cur, /* btree cursor */
- struct xfs_btree_lblock *block, /* btree long form block pointer */
- int level, /* level of the btree block */
- struct xfs_buf *bp); /* buffer containing block, if any */
/*
* Check that block header is ok.
int refval);/* ref count value for buffer */
/*
- * Get a buffer for the block, return it read in.
- * Short-form addressing.
- */
-int /* error */
-xfs_btree_read_bufs(
- struct xfs_mount *mp, /* file system mount point */
- struct xfs_trans *tp, /* transaction pointer */
- xfs_agnumber_t agno, /* allocation group number */
- xfs_agblock_t agbno, /* allocation group block number */
- uint lock, /* lock flags for read_buf */
- struct xfs_buf **bpp, /* buffer for agno/agbno */
- int refval);/* ref count value for buffer */
-
-/*
* Read-ahead the block, don't wait for it, don't return a buffer.
* Long-form addressing.
*/
int xfs_btree_lookup(struct xfs_btree_cur *, xfs_lookup_t, int *);
int xfs_btree_update(struct xfs_btree_cur *, union xfs_btree_rec *);
int xfs_btree_new_iroot(struct xfs_btree_cur *, int *, int *);
-int xfs_btree_kill_iroot(struct xfs_btree_cur *);
int xfs_btree_insert(struct xfs_btree_cur *, int *);
int xfs_btree_delete(struct xfs_btree_cur *, int *);
int xfs_btree_get_rec(struct xfs_btree_cur *, union xfs_btree_rec **, int *);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff