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authorEric Van Hensbergen <ericvh@gmail.com>2007-02-11 13:21:39 -0600
committerEric Van Hensbergen <ericvh@gmail.com>2007-02-18 10:16:10 -0600
commite03abc0c963a31cb07dfbc07c7d85d75e0d13cf4 (patch)
tree1840001bde4a7f9f01d39dd09baf7d7b04e95706 /fs/9p/vfs_inode.c
parent2c0463a9ae8751547c39302aeb31c6cef16b5df4 (diff)
9p: implement optional loose read cache
While cacheing is generally frowned upon in the 9p world, it has its place -- particularly in situations where the remote file system is exclusive and/or read-only. The vacfs views of venti content addressable store are a real-world instance of such a situation. To facilitate higher performance for these workloads (and eventually use the fscache patches), we have enabled a "loose" cache mode which does not attempt to maintain any form of consistency on the page-cache or dcache. This results in over two orders of magnitude performance improvement for cacheable block reads in the Bonnie benchmark. The more aggressive use of the dcache also seems to improve metadata operational performance. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'fs/9p/vfs_inode.c')
-rw-r--r--fs/9p/vfs_inode.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 5cf22134826b..124a085d1f2e 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -504,7 +504,10 @@ v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
goto error;
}
- dentry->d_op = &v9fs_dentry_operations;
+ if(v9ses->cache)
+ dentry->d_op = &v9fs_cached_dentry_operations;
+ else
+ dentry->d_op = &v9fs_dentry_operations;
d_instantiate(dentry, inode);
if (nd && nd->flags & LOOKUP_OPEN) {
@@ -589,7 +592,10 @@ static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
goto error;
}
- dentry->d_op = &v9fs_dentry_operations;
+ if(v9ses->cache)
+ dentry->d_op = &v9fs_cached_dentry_operations;
+ else
+ dentry->d_op = &v9fs_dentry_operations;
d_instantiate(dentry, inode);
return 0;
@@ -626,7 +632,6 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
sb = dir->i_sb;
v9ses = v9fs_inode2v9ses(dir);
- dentry->d_op = &v9fs_dentry_operations;
dirfid = v9fs_fid_lookup(dentry->d_parent);
if(IS_ERR(dirfid))
@@ -697,6 +702,10 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
fid->qid = fcall->params.rstat.stat.qid;
v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb);
+ if((fid->qid.version)&&(v9ses->cache))
+ dentry->d_op = &v9fs_cached_dentry_operations;
+ else
+ dentry->d_op = &v9fs_dentry_operations;
d_add(dentry, inode);
kfree(fcall);
@@ -1184,7 +1193,10 @@ static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
goto free_vfid;
}
- dentry->d_op = &v9fs_dentry_operations;
+ if(v9ses->cache)
+ dentry->d_op = &v9fs_cached_dentry_operations;
+ else
+ dentry->d_op = &v9fs_dentry_operations;
d_instantiate(dentry, inode);
return 0;