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authorSteven Whitehouse <swhiteho@redhat.com>2011-09-01 13:31:59 +0100
committerSteven Whitehouse <swhiteho@redhat.com>2011-10-21 12:39:34 +0100
commit54335b1fca27b84baa75b1f45985d98262003837 (patch)
treec6b21aff1759d86be56208e9981117e4383c3f47 /fs/gfs2/file.c
parent8339ee543ece6e2dcc1bbd97d5350163c198cf00 (diff)
downloadop-kernel-dev-54335b1fca27b84baa75b1f45985d98262003837.zip
op-kernel-dev-54335b1fca27b84baa75b1f45985d98262003837.tar.gz
GFS2: Cache the most recently used resource group in the inode
This means that after the initial allocation for any inode, the last used resource group is cached in the inode for future use. This drastically reduces the number of lookups of resource groups in the common case, and this the contention on that data structure. The allocation algorithm is the same as previously, except that we always check to see if the goal block is within the cached rgrp first before going to the rbtree to look one up. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/file.c')
-rw-r--r--fs/gfs2/file.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index d717b72..3467f36 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -397,7 +397,7 @@ static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
rblocks += data_blocks ? data_blocks : 1;
if (ind_blocks || data_blocks) {
rblocks += RES_STATFS + RES_QUOTA;
- rblocks += gfs2_rg_blocks(al);
+ rblocks += gfs2_rg_blocks(ip);
}
ret = gfs2_trans_begin(sdp, rblocks, 0);
if (ret)
@@ -823,7 +823,7 @@ static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len,
unsigned int *data_blocks, unsigned int *ind_blocks)
{
const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
- unsigned int max_blocks = ip->i_alloc->al_rgd->rd_free_clone;
+ unsigned int max_blocks = ip->i_rgd->rd_free_clone;
unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
for (tmp = max_data; tmp > sdp->sd_diptrs;) {
@@ -912,7 +912,7 @@ retry:
al->al_requested = data_blocks + ind_blocks;
rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
- RES_RG_HDR + gfs2_rg_blocks(al);
+ RES_RG_HDR + gfs2_rg_blocks(ip);
if (gfs2_is_jdata(ip))
rblocks += data_blocks ? data_blocks : 1;
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