9p: cache meta-data when cache=loose
This patch expands the impact of the loose cache mode to allow for cached
metadata increasing the performance of directory listings and other metadata
read operations.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index c1f7c02..2a40c29 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -67,10 +67,14 @@
return PTR_ERR(fid);
err = p9_client_open(fid, omode);
- if (err < 0) {
+ if (err < 0) {
p9_client_clunk(fid);
return err;
}
+ if (omode & P9_OTRUNC) {
+ inode->i_size = 0;
+ inode->i_blocks = 0;
+ }
}
file->private_data = fid;
@@ -151,6 +155,7 @@
{
int ret;
struct p9_fid *fid;
+ struct inode *inode = filp->f_path.dentry->d_inode;
P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data,
(int)count, (int)*offset);
@@ -160,7 +165,12 @@
if (ret > 0)
*offset += ret;
- invalidate_inode_pages2(filp->f_path.dentry->d_inode->i_mapping);
+ if (*offset > inode->i_size) {
+ inode->i_size = *offset;
+ inode->i_blocks = (inode->i_size + 512 - 1) >> 9;
+ }
+
+ invalidate_inode_pages2(inode->i_mapping);
return ret;
}
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index c602c0e..e5c45ee 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -716,6 +716,9 @@
P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
err = -EPERM;
v9ses = v9fs_inode2v9ses(dentry->d_inode);
+ if (v9ses->cache == CACHE_LOOSE)
+ return simple_getattr(mnt, dentry, stat);
+
fid = v9fs_fid_lookup(dentry);
if (IS_ERR(fid))
return PTR_ERR(fid);