[XFS] implement generic xfs_btree_updkey

From: Dave Chinner <dgc@sgi.com>

Note that there are many > 80 char lines introduced due to the
xfs_btree_key casts. But the places where this happens is throw-away code
once the whole btree code gets merged into a common implementation.

The same is true for the temporary xfs_alloc_log_keys define to the new
name. All old users will be gone after a few patches.

[hch: split out from bigger patch and minor adaptions]

SGI-PV: 985583

SGI-Modid: xfs-linux-melb:xfs-kern:32193a

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>

fs/xfs/xfs_alloc_btree.c

@@ -52,7 +52,6 @@ STATIC int xfs_alloc_newroot(xfs_btree_cur_t *, int *);
 STATIC int xfs_alloc_rshift(xfs_btree_cur_t *, int, int *);
 STATIC int xfs_alloc_split(xfs_btree_cur_t *, int, xfs_agblock_t *,
 		xfs_alloc_key_t *, xfs_btree_cur_t **, int *);
-STATIC int xfs_alloc_updkey(xfs_btree_cur_t *, xfs_alloc_key_t *, int);
 
 /*
  * Internal functions.
@@ -265,7 +264,7 @@ xfs_alloc_delrec(
 	 * If we deleted the leftmost entry in the block, update the
 	 * key values above us in the tree.
 	 */
-	if (ptr == 1 && (error = xfs_alloc_updkey(cur, lkp, level + 1)))
+	if (ptr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)lkp, level + 1)))
 		return error;
 	/*
 	 * If the number of records remaining in the block is at least
@@ -798,7 +797,7 @@ xfs_alloc_insrec(
 	/*
 	 * If we inserted at the start of a block, update the parents' keys.
 	 */
-	if (optr == 1 && (error = xfs_alloc_updkey(cur, &key, level + 1)))
+	if (optr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)&key, level + 1)))
 		return error;
 	/*
 	 * Look to see if the longest extent in the allocation group
@@ -1068,7 +1067,7 @@ xfs_alloc_lshift(
 	/*
 	 * Update the parent key values of right.
 	 */
-	if ((error = xfs_alloc_updkey(cur, rkp, level + 1)))
+	if ((error = xfs_btree_updkey(cur, (union xfs_btree_key *)rkp, level + 1)))
 		return error;
 	/*
 	 * Slide the cursor value left one.
@@ -1354,7 +1353,7 @@ xfs_alloc_rshift(
 	i = xfs_btree_lastrec(tcur, level);
 	XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
 	if ((error = xfs_btree_increment(tcur, level, &i)) ||
-	    (error = xfs_alloc_updkey(tcur, rkp, level + 1)))
+	    (error = xfs_btree_updkey(tcur, (union xfs_btree_key *)rkp, level + 1)))
 		goto error0;
 	xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
 	*stat = 1;
@@ -1519,45 +1518,6 @@ xfs_alloc_split(
 	return 0;
 }
 
-/*
- * Update keys at all levels from here to the root along the cursor's path.
- */
-STATIC int				/* error */
-xfs_alloc_updkey(
-	xfs_btree_cur_t		*cur,	/* btree cursor */
-	xfs_alloc_key_t		*keyp,	/* new key value to update to */
-	int			level)	/* starting level for update */
-{
-	int			ptr;	/* index of key in block */
-
-	/*
-	 * Go up the tree from this level toward the root.
-	 * At each level, update the key value to the value input.
-	 * Stop when we reach a level where the cursor isn't pointing
-	 * at the first entry in the block.
-	 */
-	for (ptr = 1; ptr == 1 && level < cur->bc_nlevels; level++) {
-		xfs_alloc_block_t	*block;	/* btree block */
-		xfs_buf_t		*bp;	/* buffer for block */
-#ifdef DEBUG
-		int			error;	/* error return value */
-#endif
-		xfs_alloc_key_t		*kp;	/* ptr to btree block keys */
-
-		bp = cur->bc_bufs[level];
-		block = XFS_BUF_TO_ALLOC_BLOCK(bp);
-#ifdef DEBUG
-		if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
-			return error;
-#endif
-		ptr = cur->bc_ptrs[level];
-		kp = XFS_ALLOC_KEY_ADDR(block, ptr, cur);
-		*kp = *keyp;
-		xfs_alloc_log_keys(cur, bp, ptr, ptr);
-	}
-	return 0;
-}
-
 /*
  * Externally visible routines.
  */
@@ -1765,7 +1725,7 @@ xfs_alloc_update(
 
 		key.ar_startblock = cpu_to_be32(bno);
 		key.ar_blockcount = cpu_to_be32(len);
-		if ((error = xfs_alloc_updkey(cur, &key, 1)))
+		if ((error = xfs_btree_updkey(cur, (union xfs_btree_key *)&key, 1)))
 			return error;
 	}
 	return 0;

fs/xfs/xfs_bmap_btree.c

@@ -56,7 +56,6 @@ STATIC int xfs_bmbt_lshift(xfs_btree_cur_t *, int, int *);
 STATIC int xfs_bmbt_rshift(xfs_btree_cur_t *, int, int *);
 STATIC int xfs_bmbt_split(xfs_btree_cur_t *, int, xfs_fsblock_t *,
 		__uint64_t *, xfs_btree_cur_t **, int *);
-STATIC int xfs_bmbt_updkey(xfs_btree_cur_t *, xfs_bmbt_key_t *, int);
 
 #undef EXIT
 
@@ -211,7 +210,7 @@ xfs_bmbt_delrec(
 		*stat = 1;
 		return 0;
 	}
-	if (ptr == 1 && (error = xfs_bmbt_updkey(cur, kp, level + 1))) {
+	if (ptr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)kp, level + 1))) {
 		XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 		goto error0;
 	}
@@ -635,7 +634,7 @@ xfs_bmbt_insrec(
 				kp + ptr);
 	}
 #endif
-	if (optr == 1 && (error = xfs_bmbt_updkey(cur, &key, level + 1))) {
+	if (optr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)&key, level + 1))) {
 		XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 		return error;
 	}
@@ -935,7 +934,7 @@ xfs_bmbt_lshift(
 		key.br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(rrp));
 		rkp = &key;
 	}
-	if ((error = xfs_bmbt_updkey(cur, rkp, level + 1))) {
+	if ((error = xfs_btree_updkey(cur, (union xfs_btree_key *)rkp, level + 1))) {
 		XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 		return error;
 	}
@@ -1067,7 +1066,7 @@ xfs_bmbt_rshift(
 		goto error1;
 	}
 	XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
-	if ((error = xfs_bmbt_updkey(tcur, rkp, level + 1))) {
+	if ((error = xfs_btree_updkey(tcur, (union xfs_btree_key *)rkp, level + 1))) {
 		XFS_BMBT_TRACE_CURSOR(tcur, ERROR);
 		goto error1;
 	}
@@ -1276,44 +1275,6 @@ xfs_bmbt_split(
 	return 0;
 }
 
-
-/*
- * Update keys for the record.
- */
-STATIC int
-xfs_bmbt_updkey(
-	xfs_btree_cur_t		*cur,
-	xfs_bmbt_key_t		*keyp,	/* on-disk format */
-	int			level)
-{
-	xfs_bmbt_block_t	*block;
-	xfs_buf_t		*bp;
-#ifdef DEBUG
-	int			error;
-#endif
-	xfs_bmbt_key_t		*kp;
-	int			ptr;
-
-	ASSERT(level >= 1);
-	XFS_BMBT_TRACE_CURSOR(cur, ENTRY);
-	XFS_BMBT_TRACE_ARGIK(cur, level, keyp);
-	for (ptr = 1; ptr == 1 && level < cur->bc_nlevels; level++) {
-		block = xfs_bmbt_get_block(cur, level, &bp);
-#ifdef DEBUG
-		if ((error = xfs_btree_check_lblock(cur, block, level, bp))) {
-			XFS_BMBT_TRACE_CURSOR(cur, ERROR);
-			return error;
-		}
-#endif
-		ptr = cur->bc_ptrs[level];
-		kp = XFS_BMAP_KEY_IADDR(block, ptr, cur);
-		*kp = *keyp;
-		xfs_bmbt_log_keys(cur, bp, ptr, ptr);
-	}
-	XFS_BMBT_TRACE_CURSOR(cur, EXIT);
-	return 0;
-}
-
 /*
  * Convert on-disk form of btree root to in-memory form.
  */
@@ -2039,7 +2000,7 @@ xfs_bmbt_update(
 		return 0;
 	}
 	key.br_startoff = cpu_to_be64(off);
-	if ((error = xfs_bmbt_updkey(cur, &key, 1))) {
+	if ((error = xfs_btree_updkey(cur, (union xfs_btree_key *)&key, 1))) {
 		XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 		return error;
 	}

fs/xfs/xfs_btree.c

@@ -34,6 +34,7 @@
 #include "xfs_attr_sf.h"
 #include "xfs_dinode.h"
 #include "xfs_inode.h"
+#include "xfs_inode_item.h"
 #include "xfs_btree.h"
 #include "xfs_btree_trace.h"
 #include "xfs_ialloc.h"
@@ -1064,6 +1065,45 @@ xfs_btree_read_buf_block(
 	return error;
 }
 
+/*
+ * Copy keys from one btree block to another.
+ */
+STATIC void
+xfs_btree_copy_keys(
+	struct xfs_btree_cur	*cur,
+	union xfs_btree_key	*dst_key,
+	union xfs_btree_key	*src_key,
+	int			numkeys)
+{
+	ASSERT(numkeys >= 0);
+	memcpy(dst_key, src_key, numkeys * cur->bc_ops->key_len);
+}
+
+/*
+ * Log key values from the btree block.
+ */
+STATIC void
+xfs_btree_log_keys(
+	struct xfs_btree_cur	*cur,
+	struct xfs_buf		*bp,
+	int			first,
+	int			last)
+{
+	XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
+	XFS_BTREE_TRACE_ARGBII(cur, bp, first, last);
+
+	if (bp) {
+		xfs_trans_log_buf(cur->bc_tp, bp,
+				  xfs_btree_key_offset(cur, first),
+				  xfs_btree_key_offset(cur, last + 1) - 1);
+	} else {
+		xfs_trans_log_inode(cur->bc_tp, cur->bc_private.b.ip,
+				xfs_ilog_fbroot(cur->bc_private.b.whichfork));
+	}
+
+	XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
+}
+
 /*
  * Increment cursor by one record at the level.
  * For nonzero levels the leaf-ward information is untouched.
@@ -1489,3 +1529,50 @@ xfs_btree_lookup(
 	XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
 	return error;
 }
+
+/*
+ * Update keys at all levels from here to the root along the cursor's path.
+ */
+int
+xfs_btree_updkey(
+	struct xfs_btree_cur	*cur,
+	union xfs_btree_key	*keyp,
+	int			level)
+{
+	struct xfs_btree_block	*block;
+	struct xfs_buf		*bp;
+	union xfs_btree_key	*kp;
+	int			ptr;
+
+	XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
+	XFS_BTREE_TRACE_ARGIK(cur, level, keyp);
+
+	ASSERT(!(cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) || level >= 1);
+
+	/*
+	 * Go up the tree from this level toward the root.
+	 * At each level, update the key value to the value input.
+	 * Stop when we reach a level where the cursor isn't pointing
+	 * at the first entry in the block.
+	 */
+	for (ptr = 1; ptr == 1 && level < cur->bc_nlevels; level++) {
+#ifdef DEBUG
+		int		error;
+#endif
+		block = xfs_btree_get_block(cur, level, &bp);
+#ifdef DEBUG
+		error = xfs_btree_check_block(cur, block, level, bp);
+		if (error) {
+			XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
+			return error;
+		}
+#endif
+		ptr = cur->bc_ptrs[level];
+		kp = xfs_btree_key_addr(cur, ptr, block);
+		xfs_btree_copy_keys(cur, kp, keyp, 1);
+		xfs_btree_log_keys(cur, bp, ptr, ptr);
+	}
+
+	XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
+	return 0;
+}

fs/xfs/xfs_btree.h

@@ -518,6 +518,7 @@ xfs_btree_setbuf(
 int xfs_btree_increment(struct xfs_btree_cur *, int, int *);
 int xfs_btree_decrement(struct xfs_btree_cur *, int, int *);
 int xfs_btree_lookup(struct xfs_btree_cur *, xfs_lookup_t, int *);
+int xfs_btree_updkey(struct xfs_btree_cur *, union xfs_btree_key *, int);
 
 /*
  * Helpers.