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GFS2: move toward a generic multi-block allocator

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This patch is a revision of the one I previously posted.
I tried to integrate all the suggestions Steve gave.
The purpose of the patch is to change function gfs2_alloc_block
(allocate either a dinode block or an extent of data blocks)
to a more generic gfs2_alloc_blocks function that can
allocate both a dinode _and_ an extent of data blocks in the
same call. This will ultimately help us create a multi-block
reservation scheme to reduce file fragmentation.

This patch moves more toward a generic multi-block allocator that
takes a pointer to the number of data blocks to allocate, plus whether
or not to allocate a dinode. In theory, it could be called to allocate
(1) a single dinode block, (2) a group of one or more data blocks, or
(3) a dinode plus several data blocks.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson 2011-11-18 10:58:32 -05:00 • committed by Steven Whitehouse
parent 4442f2e03e
commit 6e87ed0fc9
6 changed files with 39 additions and 39 deletions
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3
fs/gfs2/inode.c
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@ -389,6 +389,7 @@ static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
{
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
int error;
int dblocks = 0;
if (gfs2_alloc_get(dip) == NULL)
return -ENOMEM;
@ -402,7 +403,7 @@ static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
if (error)
goto out_ipreserv;
error = gfs2_alloc_block(dip, no_addr, NULL, 1, generation);
error = gfs2_alloc_blocks(dip, no_addr, &dblocks, 1, generation);
gfs2_trans_end(sdp);