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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>
This commit is contained in:
Eric Van Hensbergen 2007-07-13 13:01:27 -05:00
parent 1d6b560238
commit 9523a841b1
2 changed files with 15 additions and 2 deletions
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14
fs/9p/vfs_file.c
View File

@ -67,10 +67,14 @@ int v9fs_file_open(struct inode *inode, struct file *file)
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 @@ v9fs_file_write(struct file *filp, const char __user * data,
{
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 @@ v9fs_file_write(struct file *filp, const char __user * data,
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;
}

3
fs/9p/vfs_inode.c
View File

@ -716,6 +716,9 @@ v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
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);