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[Cluster-devel] [GFS2 Patch] GFS2: simplify function gfs2_extent_length



Hi,

See description below. :)

Regards,

Bob Peterson
Red Hat File Systems

Signed-off-by: Bob Peterson <rpeterso redhat com> 
---
Author: Bob Peterson <rpeterso redhat com>
Date:   Wed May 9 14:27:00 2012 -0500

GFS2: simplify function gfs2_extent_length

This patch simplifies function gfs2_extent_length by passing a single
parameter to the function rather than two.

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 420bbeb..31c5e81 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -345,8 +345,7 @@ static inline void release_metapath(struct metapath *mp)
 
 /**
  * gfs2_extent_length - Returns length of an extent of blocks
- * @start: Start of the buffer
- * @len: Length of the buffer in bytes
+ * @bh: The buffer header
  * @ptr: Current position in the buffer
  * @limit: Max extent length to return (0 = unlimited)
  * @eob: Set to 1 if we hit "end of block"
@@ -358,9 +357,11 @@ static inline void release_metapath(struct metapath *mp)
  * Returns: The length of the extent (minimum of one block)
  */
 
-static inline unsigned int gfs2_extent_length(void *start, unsigned int len, __be64 *ptr, unsigned limit, int *eob)
+static inline unsigned int gfs2_extent_length(struct buffer_head *bh,
+					      __be64 *ptr, unsigned limit,
+					      int *eob)
 {
-	const __be64 *end = (start + len);
+	const __be64 *end = (const __be64 *)(bh->b_data + bh->b_size);
 	const __be64 *first = ptr;
 	u64 d = be64_to_cpu(*ptr);
 
@@ -475,8 +476,7 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
 		/* Bottom indirect block exists, find unalloced extent size */
 		ptr = metapointer(end_of_metadata, mp);
 		bh = mp->mp_bh[end_of_metadata];
-		dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen,
-					   &eob);
+		dblks = gfs2_extent_length(bh, ptr, maxlen, &eob);
 		BUG_ON(dblks < 1);
 		state = ALLOC_DATA;
 	} else {
@@ -650,7 +650,7 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
 		goto do_alloc;
 	map_bh(bh_map, inode->i_sb, be64_to_cpu(*ptr));
 	bh = mp.mp_bh[ip->i_height - 1];
-	len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen, &eob);
+	len = gfs2_extent_length(bh, ptr, maxlen, &eob);
 	bh_map->b_size = (len << inode->i_blkbits);
 	if (eob)
 		set_buffer_boundary(bh_map);


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