[PATCH v6 06/27] nfs4: fold nfs_do_root_mount/nfs_follow_remote_path

Scott Mayhew
2019-12-10T12:33:54Z

From: Al Viro <viro@zeniv.linux.org.uk>

Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/nfs/nfs4super.c | 88 +++++++++++++++++++---------------------------
1 file changed, 37 insertions(+), 51 deletions(-)

diff --git a/fs/nfs/nfs4super.c b/fs/nfs/nfs4super.c
index 8146edf4ce3a..c489942b9069 100644
--- a/fs/nfs/nfs4super.c
+++ b/fs/nfs/nfs4super.c
@@ -101,37 +101,6 @@ nfs4_remote_mount(struct file_system_type *fs_type, int flags,
return nfs_fs_mount_common(flags, dev_name, info, &nfs_v4);
}

-static struct vfsmount *nfs_do_root_mount(struct nfs_server *server, int flags,
- struct nfs_mount_info *info,
- const char *hostname)
-{
- struct vfsmount *root_mnt;
- char *root_devname;
- size_t len;
-
- if (IS_ERR(server))
- return ERR_CAST(server);
-
- len = strlen(hostname) + 5;
- root_devname = kmalloc(len, GFP_KERNEL);
- if (root_devname == NULL) {
- nfs_free_server(server);
- return ERR_PTR(-ENOMEM);
- }
- /* Does hostname needs to be enclosed in brackets? */
- if (strchr(hostname, ':'))
- snprintf(root_devname, len, "[%s]:/", hostname);
- else
- snprintf(root_devname, len, "%s:/", hostname);
- info->server = server;
- root_mnt = vfs_kern_mount(&nfs4_remote_fs_type, flags, root_devname, info);
- if (info->server)
- nfs_free_server(info->server);
- info->server = NULL;
- kfree(root_devname);
- return root_mnt;
-}
-
struct nfs_referral_count {
struct list_head list;
const struct task_struct *task;
@@ -198,11 +167,38 @@ static void nfs_referral_loop_unprotect(void)
kfree(p);
}

-static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
- const char *export_path)
+static struct dentry *do_nfs4_mount(struct nfs_server *server, int flags,
+ struct nfs_mount_info *info,
+ const char *hostname,
+ const char *export_path)
{
+ struct vfsmount *root_mnt;
struct dentry *dentry;
+ char *root_devname;
int err;
+ size_t len;
+
+ if (IS_ERR(server))
+ return ERR_CAST(server);
+
+ len = strlen(hostname) + 5;
+ root_devname = kmalloc(len, GFP_KERNEL);
+ if (root_devname == NULL) {
+ nfs_free_server(server);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ /* Does hostname needs to be enclosed in brackets? */
+ if (strchr(hostname, ':'))
+ snprintf(root_devname, len, "[%s]:/", hostname);
+ else
+ snprintf(root_devname, len, "%s:/", hostname);
+ info->server = server;
+ root_mnt = vfs_kern_mount(&nfs4_remote_fs_type, flags, root_devname, info);
+ if (info->server)
+ nfs_free_server(info->server);
+ info->server = NULL;
+ kfree(root_devname);

if (IS_ERR(root_mnt))
return ERR_CAST(root_mnt);
@@ -223,22 +219,17 @@ struct dentry *nfs4_try_mount(int flags, const char *dev_name,
struct nfs_mount_info *mount_info,
struct nfs_subversion *nfs_mod)
{
- char *export_path;
- struct vfsmount *root_mnt;
- struct dentry *res;
struct nfs_parsed_mount_data *data = mount_info->parsed;
+ struct dentry *res;

mount_info->set_security = nfs_set_sb_security;

dfprintk(MOUNT, "--> nfs4_try_mount()\n");

- export_path = data->nfs_server.export_path;
- root_mnt = nfs_do_root_mount(
- nfs4_create_server(mount_info, &nfs_v4),
- flags, mount_info,
- data->nfs_server.hostname);
-
- res = nfs_follow_remote_path(root_mnt, export_path);
+ res = do_nfs4_mount(nfs4_create_server(mount_info, &nfs_v4),
+ flags, mount_info,
+ data->nfs_server.hostname,
+ data->nfs_server.export_path);

dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n",
PTR_ERR_OR_ZERO(res),
@@ -258,8 +249,6 @@ static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
.set_security = nfs_clone_sb_security,
.cloned = data,
};
- char *export_path;
- struct vfsmount *root_mnt;
struct dentry *res;

dprintk("--> nfs4_referral_mount()\n");
@@ -268,13 +257,10 @@ static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
if (!mount_info.mntfh)
return ERR_PTR(-ENOMEM);

- export_path = data->mnt_path;
- root_mnt = nfs_do_root_mount(
- nfs4_create_referral_server(mount_info.cloned,
- mount_info.mntfh),
- flags, &mount_info, data->hostname);
+ res = do_nfs4_mount(nfs4_create_referral_server(mount_info.cloned,
+ mount_info.mntfh),
+ flags, &mount_info, data->hostname, data->mnt_path);

- res = nfs_follow_remote_path(root_mnt, export_path);
dprintk("<-- nfs4_referral_mount() = %d%s\n",
PTR_ERR_OR_ZERO(res),
IS_ERR(res) ? " [error]" : "");
--
2.17.2