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GFS2: combine gfs2_alloc_block and gfs2_alloc_di

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GFS2 functions gfs2_alloc_block and gfs2_alloc_di do basically
the same things, with a few exceptions. This patch combines
the two functions into a slightly more generic gfs2_alloc_block.
Having one centralized block allocation function will reduce
code redundancy and make it easier to implement multi-block
reservations to reduce file fragmentation in the future.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson
2011-11-14 11:17:08 -05:00
committed by Steven Whitehouse
parent c688b8b334
commit 3c5d785acf
6 changed files with 45 additions and 77 deletions
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104
fs/gfs2/rgrp.c
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@@ -1304,19 +1304,24 @@ static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
* @ip: the inode to allocate the block for
* @bn: Used to return the starting block number
* @n: requested number of blocks/extent length (value/result)
* dinode: 1 if we're allocating a dinode, 0 if it's a data block
* @generation: the generation number of the inode
*
* Returns: 0 or error
*/
int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
int dinode, u64 *generation)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct buffer_head *dibh;
struct gfs2_alloc *al = ip->i_alloc;
struct gfs2_rgrpd *rgd;
u32 goal, blk;
u64 block;
u32 goal, blk; /* block, within the rgrp scope */
u64 block; /* block, within the file system scope */
unsigned int extn = 1;
int error;
unsigned char blk_type = dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED;
/* Only happens if there is a bug in gfs2, return something distinctive
* to ensure that it is noticed.
@@ -1324,14 +1329,16 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
if (al == NULL)
return -ECANCELED;
if (n == NULL)
n = &extn;
rgd = ip->i_rgd;
if (rgrp_contains_block(rgd, ip->i_goal))
if (!dinode && rgrp_contains_block(rgd, ip->i_goal))
goal = ip->i_goal - rgd->rd_data0;
else
goal = rgd->rd_last_alloc;
blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED, n);
blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, blk_type, n);
/* Since all blocks are reserved in advance, this shouldn't happen */
if (blk == BFITNOENT)
@@ -1339,82 +1346,43 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
rgd->rd_last_alloc = blk;
block = rgd->rd_data0 + blk;
ip->i_goal = block + *n - 1;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error == 0) {
struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
di->di_goal_meta = di->di_goal_data = cpu_to_be64(ip->i_goal);
brelse(dibh);
if (!dinode) {
ip->i_goal = block + *n - 1;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error == 0) {
struct gfs2_dinode *di =
(struct gfs2_dinode *)dibh->b_data;
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
di->di_goal_meta = di->di_goal_data =
cpu_to_be64(ip->i_goal);
brelse(dibh);
}
}
if (rgd->rd_free < *n)
goto rgrp_error;
rgd->rd_free -= *n;
if (dinode) {
rgd->rd_dinodes++;
*generation = rgd->rd_igeneration++;
if (*generation == 0)
*generation = rgd->rd_igeneration++;
}
gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
al->al_alloced += *n;
gfs2_statfs_change(sdp, 0, -(s64)*n, 0);
gfs2_quota_change(ip, *n, ip->i_inode.i_uid, ip->i_inode.i_gid);
gfs2_statfs_change(sdp, 0, -(s64)*n, dinode ? 1 : 0);
if (dinode)
gfs2_trans_add_unrevoke(sdp, block, 1);
else
gfs2_quota_change(ip, *n, ip->i_inode.i_uid,
ip->i_inode.i_gid);
rgd->rd_free_clone -= *n;
trace_gfs2_block_alloc(ip, block, *n, GFS2_BLKST_USED);
*bn = block;
return 0;
rgrp_error:
gfs2_rgrp_error(rgd);
return -EIO;
}
/**
* gfs2_alloc_di - Allocate a dinode
* @dip: the directory that the inode is going in
* @bn: the block number which is allocated
* @generation: the generation number of the inode
*
* Returns: 0 on success or error
*/
int gfs2_alloc_di(struct gfs2_inode *dip, u64 *bn, u64 *generation)
{
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
struct gfs2_alloc *al = dip->i_alloc;
struct gfs2_rgrpd *rgd = dip->i_rgd;
u32 blk;
u64 block;
unsigned int n = 1;
blk = rgblk_search(rgd, rgd->rd_last_alloc,
GFS2_BLKST_FREE, GFS2_BLKST_DINODE, &n);
/* Since all blocks are reserved in advance, this shouldn't happen */
if (blk == BFITNOENT)
goto rgrp_error;
rgd->rd_last_alloc = blk;
block = rgd->rd_data0 + blk;
if (rgd->rd_free == 0)
goto rgrp_error;
rgd->rd_free--;
rgd->rd_dinodes++;
*generation = rgd->rd_igeneration++;
if (*generation == 0)
*generation = rgd->rd_igeneration++;
gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
al->al_alloced++;
gfs2_statfs_change(sdp, 0, -1, +1);
gfs2_trans_add_unrevoke(sdp, block, 1);
rgd->rd_free_clone--;
trace_gfs2_block_alloc(dip, block, 1, GFS2_BLKST_DINODE);
trace_gfs2_block_alloc(ip, block, *n, blk_type);
*bn = block;
return 0;