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Go Back   Linux Archive > Redhat > Cluster Development

 
 
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Old 04-17-2008, 08:38 AM
 
Default Move part of gfs2_block_map into a separate function

From: Steven Whitehouse <swhiteho@redhat.com>

This is required to enable future changes to the block
mapping code.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index e84e384..08d1be4 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -384,6 +384,35 @@ static int lookup_block(struct gfs2_inode *ip, struct buffer_head *bh,
return 0;
}

+static int lookup_metapath(struct inode *inode, struct metapath *mp,
+ int create, int *new, u64 *dblock,
+ struct buffer_head **dibh, struct buffer_head **bh)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ unsigned int end_of_metadata = ip->i_height - 1;
+ unsigned int x;
+ int ret = gfs2_meta_inode_buffer(ip, bh);
+ if (ret)
+ return ret;
+
+ *dibh = *bh;
+ get_bh(*dibh);
+
+ for (x = 0; x < end_of_metadata; x++) {
+ lookup_block(ip, *bh, x, mp, create, new, dblock);
+ brelse(*bh);
+ *bh = NULL;
+ if (!dblock)
+ return 0;
+
+ ret = gfs2_meta_indirect_buffer(ip, x+1, *dblock, *new, bh);
+ if (ret)
+ return ret;
+ }
+
+ return lookup_block(ip, *bh, end_of_metadata, mp, create, new, dblock);
+}
+
static inline void bmap_lock(struct inode *inode, int create)
{
struct gfs2_inode *ip = GFS2_I(inode);
@@ -419,10 +448,8 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
- struct buffer_head *bh;
unsigned int bsize = sdp->sd_sb.sb_bsize;
- unsigned int end_of_metadata;
- unsigned int x;
+ struct buffer_head *bh = NULL;
int error = 0;
int new = 0;
u64 dblock = 0;
@@ -459,25 +486,11 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
}

find_metapath(ip, lblock, &mp);
- end_of_metadata = ip->i_height - 1;
- error = gfs2_meta_inode_buffer(ip, &bh);
- if (error)
+ error = lookup_metapath(inode, &mp, create, &new, &dblock, &dibh, &bh);
+ if (error < 0)
goto out_fail;
- dibh = bh;
- get_bh(dibh);
-
- for (x = 0; x < end_of_metadata; x++) {
- lookup_block(ip, bh, x, &mp, create, &new, &dblock);
- brelse(bh);
- if (!dblock)
- goto out_ok;
+ boundary = error;

- error = gfs2_meta_indirect_buffer(ip, x+1, dblock, new, &bh);
- if (error)
- goto out_fail;
- }
-
- boundary = lookup_block(ip, bh, end_of_metadata, &mp, create, &new, &dblock);
if (dblock) {
map_bh(bh_map, inode->i_sb, dblock);
if (boundary)
@@ -489,6 +502,7 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
goto out_brelse;
}
while(--maxlen && !buffer_boundary(bh_map)) {
+ unsigned int end_of_metadata = ip->i_height - 1;
u64 eblock;

mp.mp_list[end_of_metadata]++;
@@ -501,7 +515,8 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
}
}
out_brelse:
- brelse(bh);
+ if (bh)
+ brelse(bh);
out_ok:
error = 0;
out_fail:
--
1.5.1.2
 

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