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[GFS2] Move part of gfs2_block_map into a separate function

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

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse 2008-01-28 15:10:29 +00:00
parent 29d38cd163
commit 11707ea05e
1 changed files with 36 additions and 21 deletions
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57
fs/gfs2/bmap.c
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@ -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);
boundary = error;
for (x = 0; x < end_of_metadata; x++) {
lookup_block(ip, bh, x, &mp, create, &new, &dblock);
brelse(bh);
if (!dblock)
goto out_ok;
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: