From: Bryan Schumaker <bjschuma@xxxxxxxxxx>
These functions are needed by the nfs4_fs_type object, so move them into
the v4 subdirectory to compile it all together.
Signed-off-by: Bryan Schumaker <bjschuma@xxxxxxxxxx>
---
fs/nfs/Makefile | 2 +-
fs/nfs/nfs4/super.c | 731 +++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nfs/super.c | 724 --------------------------------------------------
3 files changed, 732 insertions(+), 725 deletions(-)
create mode 100644 fs/nfs/nfs4/super.c
diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
index 6bb7470..34f752d 100644
--- a/fs/nfs/Makefile
+++ b/fs/nfs/Makefile
@@ -15,7 +15,7 @@ nfs-$(CONFIG_NFS_V4) += nfs4/proc.o nfs4/xdr.o nfs4/state.o nfs4/renewd.o \
nfs4/callback_proc.o nfs4/namespace.o \
nfs4/client.o nfs4/module.o nfs4/sysctl.o \
nfs4/getroot.o nfs4/inode.o nfs4/file.o \
- nfs4/dir.o
+ nfs4/dir.o nfs4/super.o
nfs-$(CONFIG_NFS_V4_1) += pnfs.o pnfs_dev.o
nfs-$(CONFIG_SYSCTL) += sysctl.o
nfs-$(CONFIG_NFS_FSCACHE) += fscache.o fscache-index.o
diff --git a/fs/nfs/nfs4/super.c b/fs/nfs/nfs4/super.c
new file mode 100644
index 0000000..12efb65
--- /dev/null
+++ b/fs/nfs/nfs4/super.c
@@ -0,0 +1,731 @@
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/nfs_fs.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/nfs_fs_sb.h>
+
+#include "delegation.h"
+#include "../internal.h"
+#include "../fscache.h"
+#include "../nfs.h"
+
+#define NFSDBG_FACILITY NFSDBG_VFS
+
+static struct dentry *nfs4_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data);
+static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data);
+static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data);
+static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data);
+static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data);
+static void nfs4_kill_super(struct super_block *sb);
+
+struct file_system_type nfs4_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "nfs4",
+ .mount = nfs4_mount,
+ .kill_sb = nfs4_kill_super,
+ .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
+};
+
+static struct file_system_type nfs4_remote_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "nfs4",
+ .mount = nfs4_remote_mount,
+ .kill_sb = nfs4_kill_super,
+ .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
+};
+
+struct file_system_type nfs4_xdev_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "nfs4",
+ .mount = nfs4_xdev_mount,
+ .kill_sb = nfs4_kill_super,
+ .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
+};
+
+static struct file_system_type nfs4_remote_referral_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "nfs4",
+ .mount = nfs4_remote_referral_mount,
+ .kill_sb = nfs4_kill_super,
+ .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
+};
+
+struct file_system_type nfs4_referral_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "nfs4",
+ .mount = nfs4_referral_mount,
+ .kill_sb = nfs4_kill_super,
+ .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
+};
+
+static const struct super_operations nfs4_sops = {
+ .alloc_inode = nfs_alloc_inode,
+ .destroy_inode = nfs_destroy_inode,
+ .write_inode = nfs_write_inode,
+ .put_super = nfs_put_super,
+ .statfs = nfs_statfs,
+ .evict_inode = nfs4_evict_inode,
+ .umount_begin = nfs_umount_begin,
+ .show_options = nfs_show_options,
+ .show_devname = nfs_show_devname,
+ .show_path = nfs_show_path,
+ .show_stats = nfs_show_stats,
+ .remount_fs = nfs_remount,
+};
+
+/*
+ * Finish setting up a cloned NFS4 superblock
+ */
+static void nfs4_clone_super(struct super_block *sb,
+ const struct super_block *old_sb)
+{
+ sb->s_blocksize_bits = old_sb->s_blocksize_bits;
+ sb->s_blocksize = old_sb->s_blocksize;
+ sb->s_maxbytes = old_sb->s_maxbytes;
+ sb->s_time_gran = 1;
+ sb->s_op = old_sb->s_op;
+ /*
+ * The VFS shouldn't apply the umask to mode bits. We will do
+ * so ourselves when necessary.
+ */
+ sb->s_flags |= MS_POSIXACL;
+ sb->s_xattr = old_sb->s_xattr;
+ nfs_initialise_sb(sb);
+}
+
+/*
+ * Set up an NFS4 superblock
+ */
+static void nfs4_fill_super(struct super_block *sb)
+{
+ sb->s_time_gran = 1;
+ sb->s_op = &nfs4_sops;
+ /*
+ * The VFS shouldn't apply the umask to mode bits. We will do
+ * so ourselves when necessary.
+ */
+ sb->s_flags |= MS_POSIXACL;
+ sb->s_xattr = nfs4_xattr_handlers;
+ nfs_initialise_sb(sb);
+}
+
+static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
+{
+ args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
+ NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
+}
+
+int nfs4_validate_text_mount_data(void *options,
+ struct nfs_parsed_mount_data *args,
+ struct nfs_fh *mntfh,
+ const char *dev_name)
+{
+ struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
+
+ nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
+
+ nfs_validate_transport_protocol(args);
+
+ nfs4_validate_mount_flags(args);
+
+ if (args->version != 4) {
+ dfprintk(MOUNT,
+ "NFS4: Illegal mount version\n");
+ return -EINVAL;
+ }
+
+ if (args->auth_flavor_len > 1) {
+ dfprintk(MOUNT,
+ "NFS4: Too many RPC auth flavours specified\n");
+ return -EINVAL;
+ }
+
+ if (args->client_address == NULL) {
+ dfprintk(MOUNT,
+ "NFS4: mount program didn't pass callback address\n");
+ return -EINVAL;
+ }
+
+ return nfs_parse_devname(dev_name,
+ &args->nfs_server.hostname,
+ NFS4_MAXNAMLEN,
+ &args->nfs_server.export_path,
+ NFS4_MAXPATHLEN);
+}
+
+/*
+ * Validate NFSv4 mount options
+ */
+static int nfs4_validate_mount_data(void *options,
+ struct nfs_parsed_mount_data *args,
+ const char *dev_name)
+{
+ struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
+ struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
+ char *c;
+
+ if (data == NULL)
+ goto out_no_data;
+
+ switch (data->version) {
+ case 1:
+ if (data->host_addrlen > sizeof(args->nfs_server.address))
+ goto out_no_address;
+ if (data->host_addrlen == 0)
+ goto out_no_address;
+ args->nfs_server.addrlen = data->host_addrlen;
+ if (copy_from_user(sap, data->host_addr, data->host_addrlen))
+ return -EFAULT;
+ if (!nfs_verify_server_address(sap))
+ goto out_no_address;
+
+ if (data->auth_flavourlen) {
+ if (data->auth_flavourlen > 1)
+ goto out_inval_auth;
+ if (copy_from_user(&args->auth_flavors[0],
+ data->auth_flavours,
+ sizeof(args->auth_flavors[0])))
+ return -EFAULT;
+ }
+
+ c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+ args->nfs_server.hostname = c;
+
+ c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+ args->nfs_server.export_path = c;
+ dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
+
+ c = strndup_user(data->client_addr.data, 16);
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+ args->client_address = c;
+
+ /*
+ * Translate to nfs_parsed_mount_data, which nfs4_fill_super
+ * can deal with.
+ */
+
+ args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
+ args->rsize = data->rsize;
+ args->wsize = data->wsize;
+ args->timeo = data->timeo;
+ args->retrans = data->retrans;
+ args->acregmin = data->acregmin;
+ args->acregmax = data->acregmax;
+ args->acdirmin = data->acdirmin;
+ args->acdirmax = data->acdirmax;
+ args->nfs_server.protocol = data->proto;
+ nfs_validate_transport_protocol(args);
+
+ break;
+ default:
+ if (nfs_parse_mount_options((char *)options, args) == 0)
+ return -EINVAL;
+
+ if (!nfs_verify_server_address(sap))
+ return -EINVAL;
+
+ return nfs4_validate_text_mount_data(options, args, NULL, dev_name);
+ }
+
+ return 0;
+
+out_no_data:
+ dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
+ return -EINVAL;
+
+out_inval_auth:
+ dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
+ data->auth_flavourlen);
+ return -EINVAL;
+
+out_no_address:
+ dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
+ return -EINVAL;
+}
+
+/*
+ * Get the superblock for the NFS4 root partition
+ */
+static struct dentry *
+nfs4_remote_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *raw_data)
+{
+ struct nfs_parsed_mount_data *data = raw_data;
+ struct super_block *s;
+ struct nfs_server *server;
+ struct nfs_fh *mntfh;
+ struct dentry *mntroot;
+ int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
+ struct nfs_sb_mountdata sb_mntdata = {
+ .mntflags = flags,
+ };
+ int error = -ENOMEM;
+
+ mntfh = nfs_alloc_fhandle();
+ if (data == NULL || mntfh == NULL)
+ goto out;
+
+ /* Get a volume representation */
+ server = nfs4_create_server(data, mntfh);
+ if (IS_ERR(server)) {
+ error = PTR_ERR(server);
+ goto out;
+ }
+ sb_mntdata.server = server;
+
+ if (server->flags & NFS4_MOUNT_UNSHARED)
+ compare_super = NULL;
+
+ /* -o noac implies -o sync */
+ if (server->flags & NFS_MOUNT_NOAC)
+ sb_mntdata.mntflags |= MS_SYNCHRONOUS;
+
+ /* Get a superblock - note that we may end up sharing one that already exists */
+ s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
+ if (IS_ERR(s)) {
+ error = PTR_ERR(s);
+ goto out_free;
+ }
+
+ if (s->s_fs_info != server) {
+ nfs_free_server(server);
+ server = NULL;
+ } else {
+ error = nfs_bdi_register(server);
+ if (error)
+ goto error_splat_bdi;
+ }
+
+ if (!s->s_root) {
+ /* initial superblock/root creation */
+ nfs4_fill_super(s);
+ nfs_fscache_get_super_cookie(
+ s, data ? data->fscache_uniq : NULL, NULL);
+ }
+
+ mntroot = nfs4_get_root(s, mntfh, dev_name);
+ if (IS_ERR(mntroot)) {
+ error = PTR_ERR(mntroot);
+ goto error_splat_super;
+ }
+
+ error = security_sb_set_mnt_opts(s, &data->lsm_opts);
+ if (error)
+ goto error_splat_root;
+
+ s->s_flags |= MS_ACTIVE;
+
+ nfs_free_fhandle(mntfh);
+ return mntroot;
+
+out:
+ nfs_free_fhandle(mntfh);
+ return ERR_PTR(error);
+
+out_free:
+ nfs_free_server(server);
+ goto out;
+
+error_splat_root:
+ dput(mntroot);
+error_splat_super:
+ if (server && !s->s_root)
+ bdi_unregister(&server->backing_dev_info);
+error_splat_bdi:
+ deactivate_locked_super(s);
+ goto out;
+}
+
+static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
+ int flags, void *data, const char *hostname)
+{
+ struct vfsmount *root_mnt;
+ char *root_devname;
+ size_t len;
+
+ len = strlen(hostname) + 3;
+ root_devname = kmalloc(len, GFP_KERNEL);
+ if (root_devname == NULL)
+ return ERR_PTR(-ENOMEM);
+ snprintf(root_devname, len, "%s:/", hostname);
+ root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
+ kfree(root_devname);
+ return root_mnt;
+}
+
+struct nfs_referral_count {
+ struct list_head list;
+ const struct task_struct *task;
+ unsigned int referral_count;
+};
+
+static LIST_HEAD(nfs_referral_count_list);
+static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
+
+static struct nfs_referral_count *nfs_find_referral_count(void)
+{
+ struct nfs_referral_count *p;
+
+ list_for_each_entry(p, &nfs_referral_count_list, list) {
+ if (p->task == current)
+ return p;
+ }
+ return NULL;
+}
+
+#define NFS_MAX_NESTED_REFERRALS 2
+
+static int nfs_referral_loop_protect(void)
+{
+ struct nfs_referral_count *p, *new;
+ int ret = -ENOMEM;
+
+ new = kmalloc(sizeof(*new), GFP_KERNEL);
+ if (!new)
+ goto out;
+ new->task = current;
+ new->referral_count = 1;
+
+ ret = 0;
+ spin_lock(&nfs_referral_count_list_lock);
+ p = nfs_find_referral_count();
+ if (p != NULL) {
+ if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
+ ret = -ELOOP;
+ else
+ p->referral_count++;
+ } else {
+ list_add(&new->list, &nfs_referral_count_list);
+ new = NULL;
+ }
+ spin_unlock(&nfs_referral_count_list_lock);
+ kfree(new);
+out:
+ return ret;
+}
+
+static void nfs_referral_loop_unprotect(void)
+{
+ struct nfs_referral_count *p;
+
+ spin_lock(&nfs_referral_count_list_lock);
+ p = nfs_find_referral_count();
+ p->referral_count--;
+ if (p->referral_count == 0)
+ list_del(&p->list);
+ else
+ p = NULL;
+ spin_unlock(&nfs_referral_count_list_lock);
+ kfree(p);
+}
+
+static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
+ const char *export_path)
+{
+ struct dentry *dentry;
+ int ret = nfs_referral_loop_protect();
+
+ if (ret) {
+ mntput(root_mnt);
+ return ERR_PTR(ret);
+ }
+
+ dentry = mount_subtree(root_mnt, export_path);
+ nfs_referral_loop_unprotect();
+
+ return dentry;
+}
+
+struct dentry *nfs4_try_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, struct nfs_fh *mntfh,
+ struct nfs_parsed_mount_data *data)
+{
+ char *export_path;
+ struct vfsmount *root_mnt;
+ struct dentry *res;
+
+ dfprintk(MOUNT, "--> nfs4_try_mount()\n");
+
+ export_path = data->nfs_server.export_path;
+ data->nfs_server.export_path = "/";
+ root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
+ data->nfs_server.hostname);
+ data->nfs_server.export_path = export_path;
+
+ res = ERR_CAST(root_mnt);
+ if (!IS_ERR(root_mnt))
+ res = nfs_follow_remote_path(root_mnt, export_path);
+
+ dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
+ IS_ERR(res) ? PTR_ERR(res) : 0,
+ IS_ERR(res) ? " [error]" : "");
+ return res;
+}
+
+/*
+ * Get the superblock for an NFS4 mountpoint
+ */
+static struct dentry *nfs4_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data)
+{
+ struct nfs_parsed_mount_data *data;
+ int error = -ENOMEM;
+ struct dentry *res = ERR_PTR(-ENOMEM);
+
+ data = nfs_alloc_parsed_mount_data(4);
+ if (data == NULL)
+ goto out;
+
+ /* Validate the mount data */
+ error = nfs4_validate_mount_data(raw_data, data, dev_name);
+ if (error < 0) {
+ res = ERR_PTR(error);
+ goto out;
+ }
+
+ res = nfs4_try_mount(fs_type, flags, dev_name, NULL, data);
+ if (IS_ERR(res))
+ error = PTR_ERR(res);
+
+out:
+ nfs_free_parsed_mount_data(data);
+ dprintk("<-- nfs4_mount() = %d%s\n", error,
+ error != 0 ? " [error]" : "");
+ return res;
+}
+
+static void nfs4_kill_super(struct super_block *sb)
+{
+ struct nfs_server *server = NFS_SB(sb);
+
+ dprintk("--> %s\n", __func__);
+ nfs_super_return_all_delegations(sb);
+ kill_anon_super(sb);
+ nfs_fscache_release_super_cookie(sb);
+ nfs_free_server(server);
+ dprintk("<-- %s\n", __func__);
+}
+
+/*
+ * Clone an NFS4 server record on xdev traversal (FSID-change)
+ */
+static struct dentry *
+nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *raw_data)
+{
+ struct nfs_clone_mount *data = raw_data;
+ struct super_block *s;
+ struct nfs_server *server;
+ struct dentry *mntroot;
+ int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
+ struct nfs_sb_mountdata sb_mntdata = {
+ .mntflags = flags,
+ };
+ int error;
+
+ dprintk("--> nfs4_xdev_mount()\n");
+
+ /* create a new volume representation */
+ server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
+ if (IS_ERR(server)) {
+ error = PTR_ERR(server);
+ goto out_err_noserver;
+ }
+ sb_mntdata.server = server;
+
+ if (server->flags & NFS4_MOUNT_UNSHARED)
+ compare_super = NULL;
+
+ /* -o noac implies -o sync */
+ if (server->flags & NFS_MOUNT_NOAC)
+ sb_mntdata.mntflags |= MS_SYNCHRONOUS;
+
+ /* Get a superblock - note that we may end up sharing one that already exists */
+ s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
+ if (IS_ERR(s)) {
+ error = PTR_ERR(s);
+ goto out_err_nosb;
+ }
+
+ if (s->s_fs_info != server) {
+ nfs_free_server(server);
+ server = NULL;
+ } else {
+ error = nfs_bdi_register(server);
+ if (error)
+ goto error_splat_bdi;
+ }
+
+ if (!s->s_root) {
+ /* initial superblock/root creation */
+ nfs4_clone_super(s, data->sb);
+ nfs_fscache_get_super_cookie(s, NULL, data);
+ }
+
+ mntroot = nfs4_get_root(s, data->fh, dev_name);
+ if (IS_ERR(mntroot)) {
+ error = PTR_ERR(mntroot);
+ goto error_splat_super;
+ }
+ if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
+ dput(mntroot);
+ error = -ESTALE;
+ goto error_splat_super;
+ }
+
+ s->s_flags |= MS_ACTIVE;
+
+ security_sb_clone_mnt_opts(data->sb, s);
+
+ dprintk("<-- nfs4_xdev_mount() = 0\n");
+ return mntroot;
+
+out_err_nosb:
+ nfs_free_server(server);
+out_err_noserver:
+ dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
+ return ERR_PTR(error);
+
+error_splat_super:
+ if (server && !s->s_root)
+ bdi_unregister(&server->backing_dev_info);
+error_splat_bdi:
+ deactivate_locked_super(s);
+ dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
+ return ERR_PTR(error);
+}
+
+static struct dentry *
+nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *raw_data)
+{
+ struct nfs_clone_mount *data = raw_data;
+ struct super_block *s;
+ struct nfs_server *server;
+ struct dentry *mntroot;
+ struct nfs_fh *mntfh;
+ int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
+ struct nfs_sb_mountdata sb_mntdata = {
+ .mntflags = flags,
+ };
+ int error = -ENOMEM;
+
+ dprintk("--> nfs4_referral_get_sb()\n");
+
+ mntfh = nfs_alloc_fhandle();
+ if (mntfh == NULL)
+ goto out_err_nofh;
+
+ /* create a new volume representation */
+ server = nfs4_create_referral_server(data, mntfh);
+ if (IS_ERR(server)) {
+ error = PTR_ERR(server);
+ goto out_err_noserver;
+ }
+ sb_mntdata.server = server;
+
+ if (server->flags & NFS4_MOUNT_UNSHARED)
+ compare_super = NULL;
+
+ /* -o noac implies -o sync */
+ if (server->flags & NFS_MOUNT_NOAC)
+ sb_mntdata.mntflags |= MS_SYNCHRONOUS;
+
+ /* Get a superblock - note that we may end up sharing one that already exists */
+ s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
+ if (IS_ERR(s)) {
+ error = PTR_ERR(s);
+ goto out_err_nosb;
+ }
+
+ if (s->s_fs_info != server) {
+ nfs_free_server(server);
+ server = NULL;
+ } else {
+ error = nfs_bdi_register(server);
+ if (error)
+ goto error_splat_bdi;
+ }
+
+ if (!s->s_root) {
+ /* initial superblock/root creation */
+ nfs4_fill_super(s);
+ nfs_fscache_get_super_cookie(s, NULL, data);
+ }
+
+ mntroot = nfs4_get_root(s, mntfh, dev_name);
+ if (IS_ERR(mntroot)) {
+ error = PTR_ERR(mntroot);
+ goto error_splat_super;
+ }
+ if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
+ dput(mntroot);
+ error = -ESTALE;
+ goto error_splat_super;
+ }
+
+ s->s_flags |= MS_ACTIVE;
+
+ security_sb_clone_mnt_opts(data->sb, s);
+
+ nfs_free_fhandle(mntfh);
+ dprintk("<-- nfs4_referral_get_sb() = 0\n");
+ return mntroot;
+
+out_err_nosb:
+ nfs_free_server(server);
+out_err_noserver:
+ nfs_free_fhandle(mntfh);
+out_err_nofh:
+ dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
+ return ERR_PTR(error);
+
+error_splat_super:
+ if (server && !s->s_root)
+ bdi_unregister(&server->backing_dev_info);
+error_splat_bdi:
+ deactivate_locked_super(s);
+ nfs_free_fhandle(mntfh);
+ dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
+ return ERR_PTR(error);
+}
+
+/*
+ * Create an NFS4 server record on referral traversal
+ */
+static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data)
+{
+ struct nfs_clone_mount *data = raw_data;
+ char *export_path;
+ struct vfsmount *root_mnt;
+ struct dentry *res;
+
+ dprintk("--> nfs4_referral_mount()\n");
+
+ export_path = data->mnt_path;
+ data->mnt_path = "/";
+
+ root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
+ flags, data, data->hostname);
+ data->mnt_path = export_path;
+
+ res = ERR_CAST(root_mnt);
+ if (!IS_ERR(root_mnt))
+ res = nfs_follow_remote_path(root_mnt, export_path);
+ dprintk("<-- nfs4_referral_mount() = %ld%s\n",
+ IS_ERR(res) ? PTR_ERR(res) : 0,
+ IS_ERR(res) ? " [error]" : "");
+ return res;
+}
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index a06347d..7bab19e 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -299,75 +299,6 @@ static const struct super_operations nfs_sops = {
.remount_fs = nfs_remount,
};
-#ifdef CONFIG_NFS_V4
-static struct dentry *nfs4_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data);
-static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data);
-static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data);
-static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data);
-static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data);
-static void nfs4_kill_super(struct super_block *sb);
-
-struct file_system_type nfs4_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .mount = nfs4_mount,
- .kill_sb = nfs4_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
-};
-
-static struct file_system_type nfs4_remote_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .mount = nfs4_remote_mount,
- .kill_sb = nfs4_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
-};
-
-struct file_system_type nfs4_xdev_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .mount = nfs4_xdev_mount,
- .kill_sb = nfs4_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
-};
-
-static struct file_system_type nfs4_remote_referral_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .mount = nfs4_remote_referral_mount,
- .kill_sb = nfs4_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
-};
-
-struct file_system_type nfs4_referral_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .mount = nfs4_referral_mount,
- .kill_sb = nfs4_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
-};
-
-static const struct super_operations nfs4_sops = {
- .alloc_inode = nfs_alloc_inode,
- .destroy_inode = nfs_destroy_inode,
- .write_inode = nfs_write_inode,
- .put_super = nfs_put_super,
- .statfs = nfs_statfs,
- .evict_inode = nfs4_evict_inode,
- .umount_begin = nfs_umount_begin,
- .show_options = nfs_show_options,
- .show_devname = nfs_show_devname,
- .show_path = nfs_show_path,
- .show_stats = nfs_show_stats,
- .remount_fs = nfs_remount,
-};
-#endif
-
static struct shrinker acl_shrinker = {
.shrink = nfs_access_cache_shrinker,
.seeks = DEFAULT_SEEKS,
@@ -2456,658 +2387,3 @@ error_splat_bdi:
dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
return ERR_PTR(error);
}
-
-#ifdef CONFIG_NFS_V4
-
-/*
- * Finish setting up a cloned NFS4 superblock
- */
-static void nfs4_clone_super(struct super_block *sb,
- const struct super_block *old_sb)
-{
- sb->s_blocksize_bits = old_sb->s_blocksize_bits;
- sb->s_blocksize = old_sb->s_blocksize;
- sb->s_maxbytes = old_sb->s_maxbytes;
- sb->s_time_gran = 1;
- sb->s_op = old_sb->s_op;
- /*
- * The VFS shouldn't apply the umask to mode bits. We will do
- * so ourselves when necessary.
- */
- sb->s_flags |= MS_POSIXACL;
- sb->s_xattr = old_sb->s_xattr;
- nfs_initialise_sb(sb);
-}
-
-/*
- * Set up an NFS4 superblock
- */
-static void nfs4_fill_super(struct super_block *sb)
-{
- sb->s_time_gran = 1;
- sb->s_op = &nfs4_sops;
- /*
- * The VFS shouldn't apply the umask to mode bits. We will do
- * so ourselves when necessary.
- */
- sb->s_flags |= MS_POSIXACL;
- sb->s_xattr = nfs4_xattr_handlers;
- nfs_initialise_sb(sb);
-}
-
-static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
-{
- args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
- NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
-}
-
-int nfs4_validate_text_mount_data(void *options,
- struct nfs_parsed_mount_data *args,
- struct nfs_fh *mntfh,
- const char *dev_name)
-{
- struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
-
- nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
-
- nfs_validate_transport_protocol(args);
-
- nfs4_validate_mount_flags(args);
-
- if (args->version != 4) {
- dfprintk(MOUNT,
- "NFS4: Illegal mount version\n");
- return -EINVAL;
- }
-
- if (args->auth_flavor_len > 1) {
- dfprintk(MOUNT,
- "NFS4: Too many RPC auth flavours specified\n");
- return -EINVAL;
- }
-
- if (args->client_address == NULL) {
- dfprintk(MOUNT,
- "NFS4: mount program didn't pass callback address\n");
- return -EINVAL;
- }
-
- return nfs_parse_devname(dev_name,
- &args->nfs_server.hostname,
- NFS4_MAXNAMLEN,
- &args->nfs_server.export_path,
- NFS4_MAXPATHLEN);
-}
-
-/*
- * Validate NFSv4 mount options
- */
-static int nfs4_validate_mount_data(void *options,
- struct nfs_parsed_mount_data *args,
- const char *dev_name)
-{
- struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
- struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
- char *c;
-
- if (data == NULL)
- goto out_no_data;
-
- switch (data->version) {
- case 1:
- if (data->host_addrlen > sizeof(args->nfs_server.address))
- goto out_no_address;
- if (data->host_addrlen == 0)
- goto out_no_address;
- args->nfs_server.addrlen = data->host_addrlen;
- if (copy_from_user(sap, data->host_addr, data->host_addrlen))
- return -EFAULT;
- if (!nfs_verify_server_address(sap))
- goto out_no_address;
-
- if (data->auth_flavourlen) {
- if (data->auth_flavourlen > 1)
- goto out_inval_auth;
- if (copy_from_user(&args->auth_flavors[0],
- data->auth_flavours,
- sizeof(args->auth_flavors[0])))
- return -EFAULT;
- }
-
- c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
- if (IS_ERR(c))
- return PTR_ERR(c);
- args->nfs_server.hostname = c;
-
- c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
- if (IS_ERR(c))
- return PTR_ERR(c);
- args->nfs_server.export_path = c;
- dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
-
- c = strndup_user(data->client_addr.data, 16);
- if (IS_ERR(c))
- return PTR_ERR(c);
- args->client_address = c;
-
- /*
- * Translate to nfs_parsed_mount_data, which nfs4_fill_super
- * can deal with.
- */
-
- args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
- args->rsize = data->rsize;
- args->wsize = data->wsize;
- args->timeo = data->timeo;
- args->retrans = data->retrans;
- args->acregmin = data->acregmin;
- args->acregmax = data->acregmax;
- args->acdirmin = data->acdirmin;
- args->acdirmax = data->acdirmax;
- args->nfs_server.protocol = data->proto;
- nfs_validate_transport_protocol(args);
-
- break;
- default:
- if (nfs_parse_mount_options((char *)options, args) == 0)
- return -EINVAL;
-
- if (!nfs_verify_server_address(sap))
- return -EINVAL;
-
- return nfs4_validate_text_mount_data(options, args, NULL, dev_name);
- }
-
- return 0;
-
-out_no_data:
- dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
- return -EINVAL;
-
-out_inval_auth:
- dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
- data->auth_flavourlen);
- return -EINVAL;
-
-out_no_address:
- dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
- return -EINVAL;
-}
-
-/*
- * Get the superblock for the NFS4 root partition
- */
-static struct dentry *
-nfs4_remote_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *raw_data)
-{
- struct nfs_parsed_mount_data *data = raw_data;
- struct super_block *s;
- struct nfs_server *server;
- struct nfs_fh *mntfh;
- struct dentry *mntroot;
- int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
- struct nfs_sb_mountdata sb_mntdata = {
- .mntflags = flags,
- };
- int error = -ENOMEM;
-
- mntfh = nfs_alloc_fhandle();
- if (data == NULL || mntfh == NULL)
- goto out;
-
- /* Get a volume representation */
- server = nfs4_create_server(data, mntfh);
- if (IS_ERR(server)) {
- error = PTR_ERR(server);
- goto out;
- }
- sb_mntdata.server = server;
-
- if (server->flags & NFS4_MOUNT_UNSHARED)
- compare_super = NULL;
-
- /* -o noac implies -o sync */
- if (server->flags & NFS_MOUNT_NOAC)
- sb_mntdata.mntflags |= MS_SYNCHRONOUS;
-
- /* Get a superblock - note that we may end up sharing one that already exists */
- s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
- if (IS_ERR(s)) {
- error = PTR_ERR(s);
- goto out_free;
- }
-
- if (s->s_fs_info != server) {
- nfs_free_server(server);
- server = NULL;
- } else {
- error = nfs_bdi_register(server);
- if (error)
- goto error_splat_bdi;
- }
-
- if (!s->s_root) {
- /* initial superblock/root creation */
- nfs4_fill_super(s);
- nfs_fscache_get_super_cookie(
- s, data ? data->fscache_uniq : NULL, NULL);
- }
-
- mntroot = nfs4_get_root(s, mntfh, dev_name);
- if (IS_ERR(mntroot)) {
- error = PTR_ERR(mntroot);
- goto error_splat_super;
- }
-
- error = security_sb_set_mnt_opts(s, &data->lsm_opts);
- if (error)
- goto error_splat_root;
-
- s->s_flags |= MS_ACTIVE;
-
- nfs_free_fhandle(mntfh);
- return mntroot;
-
-out:
- nfs_free_fhandle(mntfh);
- return ERR_PTR(error);
-
-out_free:
- nfs_free_server(server);
- goto out;
-
-error_splat_root:
- dput(mntroot);
-error_splat_super:
- if (server && !s->s_root)
- bdi_unregister(&server->backing_dev_info);
-error_splat_bdi:
- deactivate_locked_super(s);
- goto out;
-}
-
-static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
- int flags, void *data, const char *hostname)
-{
- struct vfsmount *root_mnt;
- char *root_devname;
- size_t len;
-
- len = strlen(hostname) + 3;
- root_devname = kmalloc(len, GFP_KERNEL);
- if (root_devname == NULL)
- return ERR_PTR(-ENOMEM);
- snprintf(root_devname, len, "%s:/", hostname);
- root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
- kfree(root_devname);
- return root_mnt;
-}
-
-struct nfs_referral_count {
- struct list_head list;
- const struct task_struct *task;
- unsigned int referral_count;
-};
-
-static LIST_HEAD(nfs_referral_count_list);
-static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
-
-static struct nfs_referral_count *nfs_find_referral_count(void)
-{
- struct nfs_referral_count *p;
-
- list_for_each_entry(p, &nfs_referral_count_list, list) {
- if (p->task == current)
- return p;
- }
- return NULL;
-}
-
-#define NFS_MAX_NESTED_REFERRALS 2
-
-static int nfs_referral_loop_protect(void)
-{
- struct nfs_referral_count *p, *new;
- int ret = -ENOMEM;
-
- new = kmalloc(sizeof(*new), GFP_KERNEL);
- if (!new)
- goto out;
- new->task = current;
- new->referral_count = 1;
-
- ret = 0;
- spin_lock(&nfs_referral_count_list_lock);
- p = nfs_find_referral_count();
- if (p != NULL) {
- if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
- ret = -ELOOP;
- else
- p->referral_count++;
- } else {
- list_add(&new->list, &nfs_referral_count_list);
- new = NULL;
- }
- spin_unlock(&nfs_referral_count_list_lock);
- kfree(new);
-out:
- return ret;
-}
-
-static void nfs_referral_loop_unprotect(void)
-{
- struct nfs_referral_count *p;
-
- spin_lock(&nfs_referral_count_list_lock);
- p = nfs_find_referral_count();
- p->referral_count--;
- if (p->referral_count == 0)
- list_del(&p->list);
- else
- p = NULL;
- spin_unlock(&nfs_referral_count_list_lock);
- kfree(p);
-}
-
-static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
- const char *export_path)
-{
- struct dentry *dentry;
- int ret = nfs_referral_loop_protect();
-
- if (ret) {
- mntput(root_mnt);
- return ERR_PTR(ret);
- }
-
- dentry = mount_subtree(root_mnt, export_path);
- nfs_referral_loop_unprotect();
-
- return dentry;
-}
-
-struct dentry *nfs4_try_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, struct nfs_fh *mntfh,
- struct nfs_parsed_mount_data *data)
-{
- char *export_path;
- struct vfsmount *root_mnt;
- struct dentry *res;
-
- dfprintk(MOUNT, "--> nfs4_try_mount()\n");
-
- export_path = data->nfs_server.export_path;
- data->nfs_server.export_path = "/";
- root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
- data->nfs_server.hostname);
- data->nfs_server.export_path = export_path;
-
- res = ERR_CAST(root_mnt);
- if (!IS_ERR(root_mnt))
- res = nfs_follow_remote_path(root_mnt, export_path);
-
- dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
- IS_ERR(res) ? PTR_ERR(res) : 0,
- IS_ERR(res) ? " [error]" : "");
- return res;
-}
-
-/*
- * Get the superblock for an NFS4 mountpoint
- */
-static struct dentry *nfs4_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data)
-{
- struct nfs_parsed_mount_data *data;
- int error = -ENOMEM;
- struct dentry *res = ERR_PTR(-ENOMEM);
-
- data = nfs_alloc_parsed_mount_data(4);
- if (data == NULL)
- goto out;
-
- /* Validate the mount data */
- error = nfs4_validate_mount_data(raw_data, data, dev_name);
- if (error < 0) {
- res = ERR_PTR(error);
- goto out;
- }
-
- res = nfs4_try_mount(fs_type, flags, dev_name, NULL, data);
- if (IS_ERR(res))
- error = PTR_ERR(res);
-
-out:
- nfs_free_parsed_mount_data(data);
- dprintk("<-- nfs4_mount() = %d%s\n", error,
- error != 0 ? " [error]" : "");
- return res;
-}
-
-static void nfs4_kill_super(struct super_block *sb)
-{
- struct nfs_server *server = NFS_SB(sb);
-
- dprintk("--> %s\n", __func__);
- nfs_super_return_all_delegations(sb);
- kill_anon_super(sb);
- nfs_fscache_release_super_cookie(sb);
- nfs_free_server(server);
- dprintk("<-- %s\n", __func__);
-}
-
-/*
- * Clone an NFS4 server record on xdev traversal (FSID-change)
- */
-static struct dentry *
-nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *raw_data)
-{
- struct nfs_clone_mount *data = raw_data;
- struct super_block *s;
- struct nfs_server *server;
- struct dentry *mntroot;
- int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
- struct nfs_sb_mountdata sb_mntdata = {
- .mntflags = flags,
- };
- int error;
-
- dprintk("--> nfs4_xdev_mount()\n");
-
- /* create a new volume representation */
- server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
- if (IS_ERR(server)) {
- error = PTR_ERR(server);
- goto out_err_noserver;
- }
- sb_mntdata.server = server;
-
- if (server->flags & NFS4_MOUNT_UNSHARED)
- compare_super = NULL;
-
- /* -o noac implies -o sync */
- if (server->flags & NFS_MOUNT_NOAC)
- sb_mntdata.mntflags |= MS_SYNCHRONOUS;
-
- /* Get a superblock - note that we may end up sharing one that already exists */
- s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
- if (IS_ERR(s)) {
- error = PTR_ERR(s);
- goto out_err_nosb;
- }
-
- if (s->s_fs_info != server) {
- nfs_free_server(server);
- server = NULL;
- } else {
- error = nfs_bdi_register(server);
- if (error)
- goto error_splat_bdi;
- }
-
- if (!s->s_root) {
- /* initial superblock/root creation */
- nfs4_clone_super(s, data->sb);
- nfs_fscache_get_super_cookie(s, NULL, data);
- }
-
- mntroot = nfs4_get_root(s, data->fh, dev_name);
- if (IS_ERR(mntroot)) {
- error = PTR_ERR(mntroot);
- goto error_splat_super;
- }
- if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
- dput(mntroot);
- error = -ESTALE;
- goto error_splat_super;
- }
-
- s->s_flags |= MS_ACTIVE;
-
- security_sb_clone_mnt_opts(data->sb, s);
-
- dprintk("<-- nfs4_xdev_mount() = 0\n");
- return mntroot;
-
-out_err_nosb:
- nfs_free_server(server);
-out_err_noserver:
- dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
- return ERR_PTR(error);
-
-error_splat_super:
- if (server && !s->s_root)
- bdi_unregister(&server->backing_dev_info);
-error_splat_bdi:
- deactivate_locked_super(s);
- dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
- return ERR_PTR(error);
-}
-
-static struct dentry *
-nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *raw_data)
-{
- struct nfs_clone_mount *data = raw_data;
- struct super_block *s;
- struct nfs_server *server;
- struct dentry *mntroot;
- struct nfs_fh *mntfh;
- int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
- struct nfs_sb_mountdata sb_mntdata = {
- .mntflags = flags,
- };
- int error = -ENOMEM;
-
- dprintk("--> nfs4_referral_get_sb()\n");
-
- mntfh = nfs_alloc_fhandle();
- if (mntfh == NULL)
- goto out_err_nofh;
-
- /* create a new volume representation */
- server = nfs4_create_referral_server(data, mntfh);
- if (IS_ERR(server)) {
- error = PTR_ERR(server);
- goto out_err_noserver;
- }
- sb_mntdata.server = server;
-
- if (server->flags & NFS4_MOUNT_UNSHARED)
- compare_super = NULL;
-
- /* -o noac implies -o sync */
- if (server->flags & NFS_MOUNT_NOAC)
- sb_mntdata.mntflags |= MS_SYNCHRONOUS;
-
- /* Get a superblock - note that we may end up sharing one that already exists */
- s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
- if (IS_ERR(s)) {
- error = PTR_ERR(s);
- goto out_err_nosb;
- }
-
- if (s->s_fs_info != server) {
- nfs_free_server(server);
- server = NULL;
- } else {
- error = nfs_bdi_register(server);
- if (error)
- goto error_splat_bdi;
- }
-
- if (!s->s_root) {
- /* initial superblock/root creation */
- nfs4_fill_super(s);
- nfs_fscache_get_super_cookie(s, NULL, data);
- }
-
- mntroot = nfs4_get_root(s, mntfh, dev_name);
- if (IS_ERR(mntroot)) {
- error = PTR_ERR(mntroot);
- goto error_splat_super;
- }
- if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
- dput(mntroot);
- error = -ESTALE;
- goto error_splat_super;
- }
-
- s->s_flags |= MS_ACTIVE;
-
- security_sb_clone_mnt_opts(data->sb, s);
-
- nfs_free_fhandle(mntfh);
- dprintk("<-- nfs4_referral_get_sb() = 0\n");
- return mntroot;
-
-out_err_nosb:
- nfs_free_server(server);
-out_err_noserver:
- nfs_free_fhandle(mntfh);
-out_err_nofh:
- dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
- return ERR_PTR(error);
-
-error_splat_super:
- if (server && !s->s_root)
- bdi_unregister(&server->backing_dev_info);
-error_splat_bdi:
- deactivate_locked_super(s);
- nfs_free_fhandle(mntfh);
- dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
- return ERR_PTR(error);
-}
-
-/*
- * Create an NFS4 server record on referral traversal
- */
-static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data)
-{
- struct nfs_clone_mount *data = raw_data;
- char *export_path;
- struct vfsmount *root_mnt;
- struct dentry *res;
-
- dprintk("--> nfs4_referral_mount()\n");
-
- export_path = data->mnt_path;
- data->mnt_path = "/";
-
- root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
- flags, data, data->hostname);
- data->mnt_path = export_path;
-
- res = ERR_CAST(root_mnt);
- if (!IS_ERR(root_mnt))
- res = nfs_follow_remote_path(root_mnt, export_path);
- dprintk("<-- nfs4_referral_mount() = %ld%s\n",
- IS_ERR(res) ? PTR_ERR(res) : 0,
- IS_ERR(res) ? " [error]" : "");
- return res;
-}
-
-#endif /* CONFIG_NFS_V4 */
--
1.7.8.3
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