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[GFS2] Add extent allocation to block allocator

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Rather than having to allocate a single block at a time, this patch
allows the block allocator to allocate an extent. Since there is
no difference (so far as the block allocator is concerned) between
data blocks and indirect blocks, it is posible to allocate a single
extent and for the caller to unrevoke just the blocks required
for indirect blocks.

Currently the only bit of GFS2 to make use of this feature is the
build height function. The intention is that gfs2_block_map will
be changed to make use of this feature in future patches.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse
2008-02-06 10:11:15 +00:00
parent 1639431a3f
commit b45e41d7d5
5 changed files with 87 additions and 54 deletions
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26
fs/gfs2/bmap.c
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@ -136,8 +136,9 @@ int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
/* Get a free block, fill it with the stuffed data,
and write it out to disk */
unsigned int n = 1;
block = gfs2_alloc_block(ip, &n);
if (isdir) {
block = gfs2_alloc_block(ip);
gfs2_trans_add_unrevoke(GFS2_SB(&ip->i_inode), block, 1);
error = gfs2_dir_get_new_buffer(ip, block, &bh);
if (error)
@ -146,8 +147,6 @@ int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
dibh, sizeof(struct gfs2_dinode));
brelse(bh);
} else {
block = gfs2_alloc_block(ip);
error = gfs2_unstuffer_page(ip, dibh, block, page);
if (error)
goto out_brelse;
@ -195,7 +194,7 @@ static int build_height(struct inode *inode, struct metapath *mp, unsigned heigh
int error;
__be64 *bp;
u64 bn;
unsigned n;
unsigned n, i = 0;
if (height <= ip->i_height)
return 0;
@ -204,12 +203,16 @@ static int build_height(struct inode *inode, struct metapath *mp, unsigned heigh
if (error)
return error;
for(n = 0; n < new_height; n++) {
bn = gfs2_alloc_block(ip);
gfs2_trans_add_unrevoke(GFS2_SB(inode), bn, 1);
mp->mp_bh[n] = gfs2_meta_new(ip->i_gl, bn);
gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[n], 1);
}
do {
n = new_height - i;
bn = gfs2_alloc_block(ip, &n);
gfs2_trans_add_unrevoke(GFS2_SB(inode), bn, n);
do {
mp->mp_bh[i] = gfs2_meta_new(ip->i_gl, bn++);
gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[i], 1);
i++;
} while(i < n);
} while(i < new_height);
n = 0;
bn = mp->mp_bh[0]->b_blocknr;
@ -358,6 +361,7 @@ static int lookup_block(struct gfs2_inode *ip, unsigned int height,
{
int boundary;
__be64 *ptr = metapointer(&boundary, height, mp);
unsigned int n = 1;
if (*ptr) {
*block = be64_to_cpu(*ptr);
@ -369,7 +373,7 @@ static int lookup_block(struct gfs2_inode *ip, unsigned int height,
if (!create)
return 0;
*block = gfs2_alloc_block(ip);
*block = gfs2_alloc_block(ip, &n);
if (height != ip->i_height - 1 || gfs2_is_dir(ip))
gfs2_trans_add_unrevoke(GFS2_SB(&ip->i_inode), *block, 1);