Commit d39ab9de authored by Bryan Schumaker's avatar Bryan Schumaker Committed by Trond Myklebust
Browse files

NFS: re-add readdir plus 



This patch adds readdir plus support to the cache array.

Signed-off-by: default avatarBryan Schumaker <bjschuma@netapp.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent baf57a09

fs/nfs/dir.c

+67 −0
Original line number Diff line number Diff line
@@ -370,6 +370,71 @@ int xdr_decode(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, __be32 * 
	return 0;

}



static

int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry)

{

	struct nfs_inode *node;

	if (dentry->d_inode == NULL)

		goto different;

	node = NFS_I(dentry->d_inode);

	if (node->fh.size != entry->fh->size)

		goto different;

	if (strncmp(node->fh.data, entry->fh->data, node->fh.size) != 0)

		goto different;

	return 1;

different:

	return 0;

}



static

void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)

{

	struct qstr filename;

	struct dentry *dentry = NULL;

	struct dentry *alias = NULL;

	struct inode *dir = parent->d_inode;

	struct inode *inode;



	nfs_readdir_make_qstr(&filename, entry->name, entry->len);

	if (filename.len == 1 && filename.name[0] == '.')

		dentry = dget(parent);

	else if (filename.len == 2 && filename.name[0] == '.'

				   && filename.name[1] == '.')

		dentry = dget_parent(parent);

	else

		dentry = d_lookup(parent, &filename);



	if (dentry != NULL) {

		if (nfs_same_file(dentry, entry)) {

			nfs_refresh_inode(dentry->d_inode, entry->fattr);

			goto out;

		} else {

			d_drop(dentry);

			dput(dentry);

		}

	}



	dentry = d_alloc(parent, &filename);

	dentry->d_op = NFS_PROTO(dir)->dentry_ops;

	inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr);

	if (IS_ERR(inode))

		goto out;



	alias = d_materialise_unique(dentry, inode);

	if (IS_ERR(alias))

		goto out;

	else if (alias) {

		nfs_set_verifier(alias, nfs_save_change_attribute(dir));

		dput(alias);

	} else

		nfs_set_verifier(dentry, nfs_save_change_attribute(dir));



out:

	dput(dentry);

	kfree(filename.name);

	return;

}



/* Perform conversion from xdr to cache array */

static

void nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry,
@@ -379,6 +444,8 @@ void nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *e 
	while (xdr_decode(desc, entry, &ptr) == 0) {

		if (nfs_readdir_add_to_array(entry, page) == -1)

			break;

		if (desc->plus == 1)

			nfs_prime_dcache(desc->file->f_path.dentry, entry);

	}

	kunmap(xdr_page);

}