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authorBob Peterson <rpeterso@redhat.com>2011-11-14 11:17:08 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2011-11-15 15:25:03 +0000
commit3c5d785acfda7dffa63477951bb6864c6a49ed2e (patch)
treeaa387498361ad753777363322a35b8feb80e5f85 /fs/gfs2/rgrp.c
parentc688b8b334d20acbc79b0383af2816ecf7365741 (diff)
GFS2: combine gfs2_alloc_block and gfs2_alloc_di
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>
Diffstat (limited to 'fs/gfs2/rgrp.c')
-rw-r--r--fs/gfs2/rgrp.c104
1 files changed, 36 insertions, 68 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index a1a815b691c..995f4e67448 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -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;