From: Bryan Schumaker <bjschuma@xxxxxxxxxx>
I create a new proc_lookup_mountpoint() to use when submounting an NFS
v4 share. This function returns an rpc_clnt to use for performing an
fs_locations() call on a referral's mountpoint.
Signed-off-by: Bryan Schumaker <bjschuma@xxxxxxxxxx>
---
fs/nfs/nfs4_fs.h | 6 ++++--
fs/nfs/nfs4namespace.c | 24 ++++++++++++++----------
fs/nfs/nfs4proc.c | 40 ++++++++++++++++++++++++++++++----------
3 files changed, 48 insertions(+), 22 deletions(-)
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 640a499..16846e9 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -218,8 +218,10 @@ extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc);
extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
-extern int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
- struct nfs4_fs_locations *fs_locations, struct page *page);
+extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
+ struct nfs4_fs_locations *, struct page *);
+struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
+ struct nfs_fh *, struct nfs_fattr *);
extern int nfs4_release_lockowner(struct nfs4_lock_state *);
extern const struct xattr_handler *nfs4_xattr_handlers[];
diff --git a/fs/nfs/nfs4namespace.c b/fs/nfs/nfs4namespace.c
index b6baa6e..3cb3746 100644
--- a/fs/nfs/nfs4namespace.c
+++ b/fs/nfs/nfs4namespace.c
@@ -305,7 +305,7 @@ out:
* @dentry - dentry of referral
*
*/
-static struct vfsmount *nfs_do_refmount(struct dentry *dentry)
+static struct vfsmount *nfs_do_refmount(struct rpc_clnt *client, struct dentry *dentry)
{
struct vfsmount *mnt = ERR_PTR(-ENOMEM);
struct dentry *parent;
@@ -331,7 +331,7 @@ static struct vfsmount *nfs_do_refmount(struct dentry *dentry)
dprintk("%s: getting locations for %s/%s\n",
__func__, parent->d_name.name, dentry->d_name.name);
- err = nfs4_proc_fs_locations(parent->d_inode, &dentry->d_name, fs_locations, page);
+ err = nfs4_proc_fs_locations(client, parent->d_inode, &dentry->d_name, fs_locations, page);
dput(parent);
if (err != 0 ||
fs_locations->nlocations <= 0 ||
@@ -350,17 +350,21 @@ out:
struct vfsmount *nfs4_submount(struct nfs_server *server, struct dentry *dentry,
struct nfs_fh *fh, struct nfs_fattr *fattr)
{
- int err;
struct dentry *parent = dget_parent(dentry);
+ struct rpc_clnt *client;
+ struct vfsmount *mnt;
- /* Look it up again to get its attributes */
- err = server->nfs_client->rpc_ops->lookup(server->client, parent->d_inode,
- &dentry->d_name, fh, fattr);
+ /* Look it up again to get its attributes and sec flavor*/
+ client = nfs4_proc_lookup_mountpoint(parent->d_inode, &dentry->d_name, fh, fattr);
dput(parent);
- if (err != 0)
- return ERR_PTR(err);
+ if (IS_ERR(client))
+ return ERR_CAST(client);
if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
- return nfs_do_refmount(dentry);
- return nfs_do_submount(dentry, fh, fattr, server->client->cl_auth->au_flavor);
+ mnt = nfs_do_refmount(client, dentry);
+ else
+ mnt = nfs_do_submount(dentry, fh, fattr, client->cl_auth->au_flavor);
+
+ rpc_shutdown_client(client);
+ return mnt;
}
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 3da1d7a..6a07dd3 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2377,8 +2377,9 @@ static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
* Note that we'll actually follow the referral later when
* we detect fsid mismatch in inode revalidation
*/
-static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
- struct nfs_fattr *fattr, struct nfs_fh *fhandle)
+static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
+ const struct qstr *name, struct nfs_fattr *fattr,
+ struct nfs_fh *fhandle)
{
int status = -ENOMEM;
struct page *page = NULL;
@@ -2391,7 +2392,7 @@ static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
if (locations == NULL)
goto out;
- status = nfs4_proc_fs_locations(dir, name, locations, page);
+ status = nfs4_proc_fs_locations(client, dir, name, locations, page);
if (status != 0)
goto out;
/* Make sure server returned a different fsid for the referral */
@@ -2550,7 +2551,7 @@ static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
err = -ENOENT;
goto out;
case -NFS4ERR_MOVED:
- err = nfs4_get_referral(dir, name, fattr, fhandle);
+ err = nfs4_get_referral(client, dir, name, fattr, fhandle);
goto out;
case -NFS4ERR_WRONGSEC:
err = -EPERM;
@@ -2591,6 +2592,21 @@ static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qst
return status;
}
+struct rpc_clnt *
+nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
+ struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+ int status;
+ struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
+
+ status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
+ if (status < 0) {
+ rpc_shutdown_client(client);
+ return ERR_PTR(status);
+ }
+ return client;
+}
+
static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
{
struct nfs_server *server = NFS_SERVER(inode);
@@ -4949,8 +4965,10 @@ static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
fattr->nlink = 2;
}
-static int _nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
- struct nfs4_fs_locations *fs_locations, struct page *page)
+static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
+ const struct qstr *name,
+ struct nfs4_fs_locations *fs_locations,
+ struct page *page)
{
struct nfs_server *server = NFS_SERVER(dir);
u32 bitmask[2] = {
@@ -4984,19 +5002,21 @@ static int _nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
nfs_fattr_init(&fs_locations->fattr);
fs_locations->server = server;
fs_locations->nlocations = 0;
- status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+ status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
dprintk("%s: returned status = %d\n", __func__, status);
return status;
}
-int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
- struct nfs4_fs_locations *fs_locations, struct page *page)
+int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
+ const struct qstr *name,
+ struct nfs4_fs_locations *fs_locations,
+ struct page *page)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(NFS_SERVER(dir),
- _nfs4_proc_fs_locations(dir, name, fs_locations, page),
+ _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
&exception);
} while (exception.retry);
return err;
--
1.7.10
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