Commit 9523a841 authored by Eric Van Hensbergen's avatar Eric Van Hensbergen
Browse files

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: default avatarEric Van Hensbergen <ericvh@gmail.com>
parent 1d6b5602

fs/9p/vfs_file.c

+12 −2
Original line number Diff line number Diff line
@@ -71,6 +71,10 @@ int v9fs_file_open(struct inode *inode, struct file *file) 
			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;

}

fs/9p/vfs_inode.c

+3 −0
Original line number Diff line number Diff line
@@ -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);