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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/inode.c
parent8339ee543ece6e2dcc1bbd97d5350163c198cf00 (diff)
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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/inode.c')
-rw-r--r--fs/gfs2/inode.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 29703dd97dc9..55b3bbaf2f25 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -583,7 +583,7 @@ static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
goto fail_quota_locks;
error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
- al->al_rgd->rd_length +
+ dip->i_rgd->rd_length +
2 * RES_DINODE +
RES_STATFS + RES_QUOTA, 0);
if (error)
@@ -613,8 +613,7 @@ fail_end_trans:
gfs2_trans_end(sdp);
fail_ipreserv:
- if (dip->i_alloc->al_rgd)
- gfs2_inplace_release(dip);
+ gfs2_inplace_release(dip);
fail_quota_locks:
gfs2_quota_unlock(dip);
@@ -731,8 +730,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
brelse(bh);
gfs2_trans_end(sdp);
- if (dip->i_alloc->al_rgd)
- gfs2_inplace_release(dip);
+ gfs2_inplace_release(dip);
gfs2_quota_unlock(dip);
gfs2_alloc_put(dip);
mark_inode_dirty(inode);
@@ -896,7 +894,7 @@ static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
goto out_gunlock_q;
error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
- gfs2_rg_blocks(al) +
+ gfs2_rg_blocks(dip) +
2 * RES_DINODE + RES_STATFS +
RES_QUOTA, 0);
if (error)
@@ -1371,7 +1369,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
goto out_gunlock_q;
error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
- gfs2_rg_blocks(al) +
+ gfs2_rg_blocks(ndip) +
4 * RES_DINODE + 4 * RES_LEAF +
RES_STATFS + RES_QUOTA + 4, 0);
if (error)