patch-2.4.18 linux/fs/freevxfs/vxfs_bmap.c

• Lines: 101
• Date: Mon Feb 4 19:16:43 2002
• Orig file: linux.orig/fs/freevxfs/vxfs_bmap.c
• Orig date: Mon Feb 18 20:18:40 2002

diff -Naur -X /home/marcelo/lib/dontdiff linux.orig/fs/freevxfs/vxfs_bmap.c linux/fs/freevxfs/vxfs_bmap.c
@@ -27,7 +27,7 @@
  * SUCH DAMAGE.
  */
 
-#ident "$Id: vxfs_bmap.c,v 1.23 2001/07/05 19:48:03 hch Exp hch $"
+#ident "$Id: vxfs_bmap.c,v 1.25 2002/01/02 23:36:55 hch Exp hch $"
 
 /*
  * Veritas filesystem driver - filesystem to disk block mapping.
@@ -64,49 +64,47 @@
  *   The physical block number on success, else Zero.
  */
 static daddr_t
-vxfs_bmap_ext4(struct inode *ip, long iblock)
+vxfs_bmap_ext4(struct inode *ip, long bn)
 {
-	struct vxfs_inode_info		*vip = VXFS_INO(ip);
-	struct super_block		*sbp = ip->i_sb;
-	kdev_t				dev = ip->i_dev;
-	u_long				bsize = sbp->s_blocksize;
-	long				size = 0;
-	int				i;
-
-	for (i = 0; i < VXFS_NDADDR; i++) {
-		struct direct		*dp = vip->vii_ext4.ve4_direct + i;
+	struct super_block *sb = ip->i_sb;
+	struct vxfs_inode_info *vip = VXFS_INO(ip);
+	unsigned long bsize = sb->s_blocksize;
+	u32 indsize = vip->vii_ext4.ve4_indsize;
+	int i;
 
-#ifdef DIAGNOSTIC
-		printk(KERN_DEBUG "iblock: %ld, %d (size: %lu)\n", iblock, i, size);
-		printk(KERN_DEBUG "dp->extent: %d, dp->size: %d\n", dp->extent, dp->size);
-#endif
+	if (indsize > sb->s_blocksize)
+		goto fail_size;
 
-		if (iblock >= size && iblock < (size + dp->size))
-			return ((iblock - size) + dp->extent);
-		size += dp->size;
+	for (i = 0; i < VXFS_NDADDR; i++) {
+		struct direct *d = vip->vii_ext4.ve4_direct + i;
+		if (bn >= 0 && bn < d->size)
+			return (bn + d->extent);
+		bn -= d->size;
 	}
 
-	iblock -= size;
+	if ((bn / (indsize * indsize * bsize / 4)) == 0) {
+		struct buffer_head *buf;
+		daddr_t	bno;
+		u32 *indir;
+
+		buf = sb_bread(sb, vip->vii_ext4.ve4_indir[0]);
+		if (!buf || !buffer_mapped(buf))
+			goto fail_buf;
 
-	if (!(iblock / (vip->vii_ext4.ve4_indsize * vip->vii_ext4.ve4_indsize * bsize >> 2))) {
-		struct buffer_head	*bp;
-		daddr_t			pblock;
-
-		/*
-		 * XXX: is the second indir only used for
-		 *	double indirect extents?
-		 */
-		bp = bread(dev, vip->vii_ext4.ve4_indir[0],
-				bsize * ((vip->vii_ext4.ve4_indsize) / bsize) + 1);
-		pblock = *(bp->b_data + ((iblock / vip->vii_ext4.ve4_indsize) %
-					(vip->vii_ext4.ve4_indsize * bsize)));
+		indir = (u32 *)buf->b_data;
+		bno = indir[(bn/indsize) % (indsize*bn)] + (bn%indsize);
 
-		brelse(bp);
-		return (pblock + (iblock % vip->vii_ext4.ve4_indsize));
+		brelse(buf);
+		return bno;
 	} else
 		printk(KERN_WARNING "no matching indir?");
 
 	return 0;
+
+fail_size:
+	printk("vxfs: indirect extent to big!\n");
+fail_buf:
+	return 0;
 }
 
 /**
@@ -137,9 +135,8 @@
 		struct vxfs_typed	*typ;
 		int64_t			off;
 
-		bp = bread(ip->i_dev,
-				indir + (i / VXFS_TYPED_PER_BLOCK(ip->i_sb)),
-				ip->i_sb->s_blocksize);
+		bp = sb_bread(ip->i_sb,
+				indir + (i / VXFS_TYPED_PER_BLOCK(ip->i_sb)));
 		if (!buffer_mapped(bp))
 			return 0;