/*
* get an NFS4 root dentry from the root filehandle
*/
struct dentry *nfs4_get_root(struct super_block *sb, struct nfs_fh *mntfh)
{
struct nfs_server *server = NFS_SB(sb);
struct nfs_fattr fattr;
struct dentry *mntroot;
struct inode *inode;
int error;
dprintk("--> nfs4_get_root()\n");
/* get the info about the server and filesystem */
error = nfs4_server_capabilities(server, mntfh);
if (error < 0) {
dprintk("nfs_get_root: getcaps error = %d\n",
-error);
return ERR_PTR(error);
}
/* get the actual root for this mount */
error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
if (error < 0) {
dprintk("nfs_get_root: getattr error = %d\n", -error);
return ERR_PTR(error);
}
inode = nfs_fhget(sb, mntfh, &fattr);
if (IS_ERR(inode)) {
dprintk("nfs_get_root: get root inode failed\n");
return ERR_CAST(inode);
}
error = nfs_superblock_set_dummy_root(sb, inode);
if (error != 0)
return ERR_PTR(error);
/* root dentries normally start off anonymous and get spliced in later
* if the dentry tree reaches them; however if the dentry already
* exists, we'll pick it up at this point and use it as the root
*/
mntroot = d_obtain_alias(inode);
if (IS_ERR(mntroot)) {
dprintk("nfs_get_root: get root dentry failed\n");
return mntroot;
}
security_d_instantiate(mntroot, inode);
if (!mntroot->d_op)
mntroot->d_op = server->nfs_client->rpc_ops->dentry_ops;
dprintk("<-- nfs4_get_root()\n");
return mntroot;
}
/*
* get an NFS4 root dentry from the root filehandle
*/
struct dentry *nfs4_get_root(struct super_block *sb, struct nfs_fh *mntfh)
{
struct nfs_server *server = NFS_SB(sb);
struct nfs_fattr fattr;
struct dentry *mntroot;
struct inode *inode;
int error;
dprintk("--> nfs4_get_root()\n");
/* create a dummy root dentry with dummy inode for this superblock */
if (!sb->s_root) {
struct nfs_fh dummyfh;
struct dentry *root;
struct inode *iroot;
memset(&dummyfh, 0, sizeof(dummyfh));
memset(&fattr, 0, sizeof(fattr));
nfs_fattr_init(&fattr);
fattr.valid = NFS_ATTR_FATTR;
fattr.type = NFDIR;
fattr.mode = S_IFDIR | S_IRUSR | S_IWUSR;
fattr.nlink = 2;
iroot = nfs_fhget(sb, &dummyfh, &fattr);
if (IS_ERR(iroot))
return ERR_PTR(PTR_ERR(iroot));
root = d_alloc_root(iroot);
if (!root) {
iput(iroot);
return ERR_PTR(-ENOMEM);
}
sb->s_root = root;
}
/* get the info about the server and filesystem */
error = nfs4_server_capabilities(server, mntfh);
if (error < 0) {
dprintk("nfs_get_root: getcaps error = %d\n",
-error);
return ERR_PTR(error);
}
/* get the actual root for this mount */
error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
if (error < 0) {
dprintk("nfs_get_root: getattr error = %d\n", -error);
return ERR_PTR(error);
}
inode = nfs_fhget(sb, mntfh, &fattr);
if (IS_ERR(inode)) {
dprintk("nfs_get_root: get root inode failed\n");
return ERR_PTR(PTR_ERR(inode));
}
/* root dentries normally start off anonymous and get spliced in later
* if the dentry tree reaches them; however if the dentry already
* exists, we'll pick it up at this point and use it as the root
*/
mntroot = d_alloc_anon(inode);
if (!mntroot) {
iput(inode);
dprintk("nfs_get_root: get root dentry failed\n");
return ERR_PTR(-ENOMEM);
}
security_d_instantiate(mntroot, inode);
if (!mntroot->d_op)
mntroot->d_op = server->nfs_client->rpc_ops->dentry_ops;
dprintk("<-- nfs4_get_root()\n");
return mntroot;
}
/*
* get an NFS4 root dentry from the root filehandle
*/
struct dentry *nfs4_get_root(struct super_block *sb, struct nfs_fh *mntfh,
const char *devname)
{
struct nfs_server *server = NFS_SB(sb);
struct nfs_fattr *fattr = NULL;
struct dentry *ret;
struct inode *inode;
void *name = kstrdup(devname, GFP_KERNEL);
int error;
dprintk("--> nfs4_get_root()\n");
if (!name)
return ERR_PTR(-ENOMEM);
/* get the info about the server and filesystem */
error = nfs4_server_capabilities(server, mntfh);
if (error < 0) {
dprintk("nfs_get_root: getcaps error = %d\n",
-error);
kfree(name);
return ERR_PTR(error);
}
fattr = nfs_alloc_fattr();
if (fattr == NULL) {
kfree(name);
return ERR_PTR(-ENOMEM);
}
/* get the actual root for this mount */
error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
if (error < 0) {
dprintk("nfs_get_root: getattr error = %d\n", -error);
ret = ERR_PTR(error);
goto out;
}
if (fattr->valid & NFS_ATTR_FATTR_FSID &&
!nfs_fsid_equal(&server->fsid, &fattr->fsid))
memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
inode = nfs_fhget(sb, mntfh, fattr);
if (IS_ERR(inode)) {
dprintk("nfs_get_root: get root inode failed\n");
ret = ERR_CAST(inode);
goto out;
}
error = nfs_superblock_set_dummy_root(sb, inode);
if (error != 0) {
ret = ERR_PTR(error);
goto out;
}
/* root dentries normally start off anonymous and get spliced in later
* if the dentry tree reaches them; however if the dentry already
* exists, we'll pick it up at this point and use it as the root
*/
ret = d_obtain_alias(inode);
if (IS_ERR(ret)) {
dprintk("nfs_get_root: get root dentry failed\n");
goto out;
}
security_d_instantiate(ret, inode);
spin_lock(&ret->d_lock);
if (IS_ROOT(ret) && !(ret->d_flags & DCACHE_NFSFS_RENAMED)) {
ret->d_fsdata = name;
name = NULL;
}
spin_unlock(&ret->d_lock);
out:
if (name)
kfree(name);
nfs_free_fattr(fattr);
dprintk("<-- nfs4_get_root()\n");
return ret;
}
