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-rw-r--r--fs/nfs/super.c478
1 files changed, 176 insertions, 302 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index b68c8607770f..2b8e9a5e366a 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -263,8 +263,11 @@ static match_table_t nfs_local_lock_tokens = {
static void nfs_umount_begin(struct super_block *);
static int nfs_statfs(struct dentry *, struct kstatfs *);
static int nfs_show_options(struct seq_file *, struct vfsmount *);
+static int nfs_show_devname(struct seq_file *, struct vfsmount *);
+static int nfs_show_path(struct seq_file *, struct vfsmount *);
static int nfs_show_stats(struct seq_file *, struct vfsmount *);
-static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
+static struct dentry *nfs_fs_mount(struct file_system_type *,
+ int, const char *, void *);
static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data);
static void nfs_put_super(struct super_block *);
@@ -274,7 +277,7 @@ static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
static struct file_system_type nfs_fs_type = {
.owner = THIS_MODULE,
.name = "nfs",
- .get_sb = nfs_get_sb,
+ .mount = nfs_fs_mount,
.kill_sb = nfs_kill_super,
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
@@ -296,6 +299,8 @@ static const struct super_operations nfs_sops = {
.evict_inode = nfs_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,
};
@@ -303,16 +308,16 @@ static const struct super_operations nfs_sops = {
#ifdef CONFIG_NFS_V4
static int nfs4_validate_text_mount_data(void *options,
struct nfs_parsed_mount_data *args, const char *dev_name);
-static int nfs4_try_mount(int flags, const char *dev_name,
- struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
-static int nfs4_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
+static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
+ struct nfs_parsed_mount_data *data);
+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 int nfs4_referral_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
+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);
@@ -320,7 +325,7 @@ static void nfs4_kill_super(struct super_block *sb);
static struct file_system_type nfs4_fs_type = {
.owner = THIS_MODULE,
.name = "nfs4",
- .get_sb = nfs4_get_sb,
+ .mount = nfs4_mount,
.kill_sb = nfs4_kill_super,
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
@@ -352,7 +357,7 @@ static struct file_system_type nfs4_remote_referral_fs_type = {
struct file_system_type nfs4_referral_fs_type = {
.owner = THIS_MODULE,
.name = "nfs4",
- .get_sb = nfs4_referral_get_sb,
+ .mount = nfs4_referral_mount,
.kill_sb = nfs4_kill_super,
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
@@ -366,6 +371,8 @@ static const struct super_operations nfs4_sops = {
.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,
};
@@ -726,6 +733,28 @@ static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
return 0;
}
+static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt)
+{
+ char *page = (char *) __get_free_page(GFP_KERNEL);
+ char *devname, *dummy;
+ int err = 0;
+ if (!page)
+ return -ENOMEM;
+ devname = nfs_path(&dummy, mnt->mnt_root, page, PAGE_SIZE);
+ if (IS_ERR(devname))
+ err = PTR_ERR(devname);
+ else
+ seq_escape(m, devname, " \t\n\\");
+ free_page((unsigned long)page);
+ return err;
+}
+
+static int nfs_show_path(struct seq_file *m, struct vfsmount *mnt)
+{
+ seq_puts(m, "/");
+ return 0;
+}
+
/*
* Present statistical information for this VFS mountpoint
*/
@@ -979,6 +1008,27 @@ static int nfs_parse_security_flavors(char *value,
return 1;
}
+static int nfs_get_option_str(substring_t args[], char **option)
+{
+ kfree(*option);
+ *option = match_strdup(args);
+ return !option;
+}
+
+static int nfs_get_option_ul(substring_t args[], unsigned long *option)
+{
+ int rc;
+ char *string;
+
+ string = match_strdup(args);
+ if (string == NULL)
+ return -ENOMEM;
+ rc = strict_strtoul(string, 10, option);
+ kfree(string);
+
+ return rc;
+}
+
/*
* Error-check and convert a string of mount options from user space into
* a data structure. The whole mount string is processed; bad options are
@@ -1127,155 +1177,82 @@ static int nfs_parse_mount_options(char *raw,
* options that take numeric values
*/
case Opt_port:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0 || option > USHRT_MAX)
+ if (nfs_get_option_ul(args, &option) ||
+ option > USHRT_MAX)
goto out_invalid_value;
mnt->nfs_server.port = option;
break;
case Opt_rsize:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->rsize = option;
break;
case Opt_wsize:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->wsize = option;
break;
case Opt_bsize:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->bsize = option;
break;
case Opt_timeo:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0 || option == 0)
+ if (nfs_get_option_ul(args, &option) || option == 0)
goto out_invalid_value;
mnt->timeo = option;
break;
case Opt_retrans:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0 || option == 0)
+ if (nfs_get_option_ul(args, &option) || option == 0)
goto out_invalid_value;
mnt->retrans = option;
break;
case Opt_acregmin:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->acregmin = option;
break;
case Opt_acregmax:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->acregmax = option;
break;
case Opt_acdirmin:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->acdirmin = option;
break;
case Opt_acdirmax:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->acdirmax = option;
break;
case Opt_actimeo:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->acregmin = mnt->acregmax =
mnt->acdirmin = mnt->acdirmax = option;
break;
case Opt_namelen:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->namlen = option;
break;
case Opt_mountport:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0 || option > USHRT_MAX)
+ if (nfs_get_option_ul(args, &option) ||
+ option > USHRT_MAX)
goto out_invalid_value;
mnt->mount_server.port = option;
break;
case Opt_mountvers:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0 ||
+ if (nfs_get_option_ul(args, &option) ||
option < NFS_MNT_VERSION ||
option > NFS_MNT3_VERSION)
goto out_invalid_value;
mnt->mount_server.version = option;
break;
case Opt_nfsvers:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
switch (option) {
case NFS2_VERSION:
@@ -1295,12 +1272,7 @@ static int nfs_parse_mount_options(char *raw,
}
break;
case Opt_minorversion:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
if (option > NFS4_MAX_MINOR_VERSION)
goto out_invalid_value;
@@ -1336,21 +1308,18 @@ static int nfs_parse_mount_options(char *raw,
case Opt_xprt_udp:
mnt->flags &= ~NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
- kfree(string);
break;
case Opt_xprt_tcp6:
protofamily = AF_INET6;
case Opt_xprt_tcp:
mnt->flags |= NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
- kfree(string);
break;
case Opt_xprt_rdma:
/* vector side protocols to TCP */
mnt->flags |= NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
xprt_load_transport(string);
- kfree(string);
break;
default:
dfprintk(MOUNT, "NFS: unrecognized "
@@ -1358,6 +1327,7 @@ static int nfs_parse_mount_options(char *raw,
kfree(string);
return 0;
}
+ kfree(string);
break;
case Opt_mountproto:
string = match_strdup(args);
@@ -1400,18 +1370,13 @@ static int nfs_parse_mount_options(char *raw,
goto out_invalid_address;
break;
case Opt_clientaddr:
- string = match_strdup(args);
- if (string == NULL)
+ if (nfs_get_option_str(args, &mnt->client_address))
goto out_nomem;
- kfree(mnt->client_address);
- mnt->client_address = string;
break;
case Opt_mounthost:
- string = match_strdup(args);
- if (string == NULL)
+ if (nfs_get_option_str(args,
+ &mnt->mount_server.hostname))
goto out_nomem;
- kfree(mnt->mount_server.hostname);
- mnt->mount_server.hostname = string;
break;
case Opt_mountaddr:
string = match_strdup(args);
@@ -1451,11 +1416,8 @@ static int nfs_parse_mount_options(char *raw,
};
break;
case Opt_fscache_uniq:
- string = match_strdup(args);
- if (string == NULL)
+ if (nfs_get_option_str(args, &mnt->fscache_uniq))
goto out_nomem;
- kfree(mnt->fscache_uniq);
- mnt->fscache_uniq = string;
mnt->options |= NFS_OPTION_FSCACHE;
break;
case Opt_local_lock:
@@ -1665,99 +1627,59 @@ static int nfs_try_mount(struct nfs_parsed_mount_data *args,
return nfs_walk_authlist(args, &request);
}
-static int nfs_parse_simple_hostname(const char *dev_name,
- char **hostname, size_t maxnamlen,
- char **export_path, size_t maxpathlen)
+/*
+ * Split "dev_name" into "hostname:export_path".
+ *
+ * The leftmost colon demarks the split between the server's hostname
+ * and the export path. If the hostname starts with a left square
+ * bracket, then it may contain colons.
+ *
+ * Note: caller frees hostname and export path, even on error.
+ */
+static int nfs_parse_devname(const char *dev_name,
+ char **hostname, size_t maxnamlen,
+ char **export_path, size_t maxpathlen)
{
size_t len;
- char *colon, *comma;
-
- colon = strchr(dev_name, ':');
- if (colon == NULL)
- goto out_bad_devname;
-
- len = colon - dev_name;
- if (len > maxnamlen)
- goto out_hostname;
+ char *end;
- /* N.B. caller will free nfs_server.hostname in all cases */
- *hostname = kstrndup(dev_name, len, GFP_KERNEL);
- if (!*hostname)
- goto out_nomem;
-
- /* kill possible hostname list: not supported */
- comma = strchr(*hostname, ',');
- if (comma != NULL) {
- if (comma == *hostname)
+ /* Is the host name protected with square brakcets? */
+ if (*dev_name == '[') {
+ end = strchr(++dev_name, ']');
+ if (end == NULL || end[1] != ':')
goto out_bad_devname;
- *comma = '\0';
- }
- colon++;
- len = strlen(colon);
- if (len > maxpathlen)
- goto out_path;
- *export_path = kstrndup(colon, len, GFP_KERNEL);
- if (!*export_path)
- goto out_nomem;
-
- dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
- return 0;
-
-out_bad_devname:
- dfprintk(MOUNT, "NFS: device name not in host:path format\n");
- return -EINVAL;
-
-out_nomem:
- dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
- return -ENOMEM;
-
-out_hostname:
- dfprintk(MOUNT, "NFS: server hostname too long\n");
- return -ENAMETOOLONG;
-
-out_path:
- dfprintk(MOUNT, "NFS: export pathname too long\n");
- return -ENAMETOOLONG;
-}
-
-/*
- * Hostname has square brackets around it because it contains one or
- * more colons. We look for the first closing square bracket, and a
- * colon must follow it.
- */
-static int nfs_parse_protected_hostname(const char *dev_name,
- char **hostname, size_t maxnamlen,
- char **export_path, size_t maxpathlen)
-{
- size_t len;
- char *start, *end;
+ len = end - dev_name;
+ end++;
+ } else {
+ char *comma;
- start = (char *)(dev_name + 1);
+ end = strchr(dev_name, ':');
+ if (end == NULL)
+ goto out_bad_devname;
+ len = end - dev_name;
- end = strchr(start, ']');
- if (end == NULL)
- goto out_bad_devname;
- if (*(end + 1) != ':')
- goto out_bad_devname;
+ /* kill possible hostname list: not supported */
+ comma = strchr(dev_name, ',');
+ if (comma != NULL && comma < end)
+ *comma = 0;
+ }
- len = end - start;
if (len > maxnamlen)
goto out_hostname;
/* N.B. caller will free nfs_server.hostname in all cases */
- *hostname = kstrndup(start, len, GFP_KERNEL);
+ *hostname = kstrndup(dev_name, len, GFP_KERNEL);
if (*hostname == NULL)
goto out_nomem;
-
- end += 2;
- len = strlen(end);
+ len = strlen(++end);
if (len > maxpathlen)
goto out_path;
*export_path = kstrndup(end, len, GFP_KERNEL);
if (!*export_path)
goto out_nomem;
+ dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
return 0;
out_bad_devname:
@@ -1778,29 +1700,6 @@ out_path:
}
/*
- * Split "dev_name" into "hostname:export_path".
- *
- * The leftmost colon demarks the split between the server's hostname
- * and the export path. If the hostname starts with a left square
- * bracket, then it may contain colons.
- *
- * Note: caller frees hostname and export path, even on error.
- */
-static int nfs_parse_devname(const char *dev_name,
- char **hostname, size_t maxnamlen,
- char **export_path, size_t maxpathlen)
-{
- if (*dev_name == '[')
- return nfs_parse_protected_hostname(dev_name,
- hostname, maxnamlen,
- export_path, maxpathlen);
-
- return nfs_parse_simple_hostname(dev_name,
- hostname, maxnamlen,
- export_path, maxpathlen);
-}
-
-/*
* Validate the NFS2/NFS3 mount data
* - fills in the mount root filehandle
*
@@ -2267,19 +2166,19 @@ static int nfs_bdi_register(struct nfs_server *server)
return bdi_register_dev(&server->backing_dev_info, server->s_dev);
}
-static int nfs_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
+static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data)
{
struct nfs_server *server = NULL;
struct super_block *s;
struct nfs_parsed_mount_data *data;
struct nfs_fh *mntfh;
- struct dentry *mntroot;
+ struct dentry *mntroot = ERR_PTR(-ENOMEM);
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
struct nfs_sb_mountdata sb_mntdata = {
.mntflags = flags,
};
- int error = -ENOMEM;
+ int error;
data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
mntfh = nfs_alloc_fhandle();
@@ -2290,12 +2189,14 @@ static int nfs_get_sb(struct file_system_type *fs_type,
/* Validate the mount data */
error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
- if (error < 0)
+ if (error < 0) {
+ mntroot = ERR_PTR(error);
goto out;
+ }
#ifdef CONFIG_NFS_V4
if (data->version == 4) {
- error = nfs4_try_mount(flags, dev_name, data, mnt);
+ mntroot = nfs4_try_mount(flags, dev_name, data);
kfree(data->client_address);
kfree(data->nfs_server.export_path);
goto out;
@@ -2305,7 +2206,7 @@ static int nfs_get_sb(struct file_system_type *fs_type,
/* Get a volume representation */
server = nfs_create_server(data, mntfh);
if (IS_ERR(server)) {
- error = PTR_ERR(server);
+ mntroot = ERR_CAST(server);
goto out;
}
sb_mntdata.server = server;
@@ -2316,7 +2217,7 @@ static int nfs_get_sb(struct file_system_type *fs_type,
/* Get a superblock - note that we may end up sharing one that already exists */
s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
if (IS_ERR(s)) {
- error = PTR_ERR(s);
+ mntroot = ERR_CAST(s);
goto out_err_nosb;
}
@@ -2325,8 +2226,10 @@ static int nfs_get_sb(struct file_system_type *fs_type,
server = NULL;
} else {
error = nfs_bdi_register(server);
- if (error)
+ if (error) {
+ mntroot = ERR_PTR(error);
goto error_splat_bdi;
+ }
}
if (!s->s_root) {
@@ -2336,20 +2239,15 @@ static int nfs_get_sb(struct file_system_type *fs_type,
s, data ? data->fscache_uniq : NULL, NULL);
}
- mntroot = nfs_get_root(s, mntfh);
- if (IS_ERR(mntroot)) {
- error = PTR_ERR(mntroot);
+ mntroot = nfs_get_root(s, mntfh, dev_name);
+ if (IS_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;
- mnt->mnt_sb = s;
- mnt->mnt_root = mntroot;
- error = 0;
out:
kfree(data->nfs_server.hostname);
@@ -2359,7 +2257,7 @@ out:
out_free_fh:
nfs_free_fhandle(mntfh);
kfree(data);
- return error;
+ return mntroot;
out_err_nosb:
nfs_free_server(server);
@@ -2367,6 +2265,7 @@ out_err_nosb:
error_splat_root:
dput(mntroot);
+ mntroot = ERR_PTR(error);
error_splat_super:
if (server && !s->s_root)
bdi_unregister(&server->backing_dev_info);
@@ -2450,7 +2349,7 @@ nfs_xdev_mount(struct file_system_type *fs_type, int flags,
nfs_fscache_get_super_cookie(s, NULL, data);
}
- mntroot = nfs_get_root(s, data->fh);
+ mntroot = nfs_get_root(s, data->fh, dev_name);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
@@ -2718,7 +2617,7 @@ nfs4_remote_mount(struct file_system_type *fs_type, int flags,
s, data ? data->fscache_uniq : NULL, NULL);
}
- mntroot = nfs4_get_root(s, mntfh);
+ mntroot = nfs4_get_root(s, mntfh, dev_name);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
@@ -2771,27 +2670,6 @@ static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
return root_mnt;
}
-static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
-{
- char *page = (char *) __get_free_page(GFP_KERNEL);
- char *devname, *tmp;
-
- if (page == NULL)
- return;
- devname = nfs_path(path->mnt->mnt_devname,
- path->mnt->mnt_root, path->dentry,
- page, PAGE_SIZE);
- if (IS_ERR(devname))
- goto out_freepage;
- tmp = kstrdup(devname, GFP_KERNEL);
- if (tmp == NULL)
- goto out_freepage;
- kfree(mnt->mnt_devname);
- mnt->mnt_devname = tmp;
-out_freepage:
- free_page((unsigned long)page);
-}
-
struct nfs_referral_count {
struct list_head list;
const struct task_struct *task;
@@ -2858,17 +2736,18 @@ static void nfs_referral_loop_unprotect(void)
kfree(p);
}
-static int nfs_follow_remote_path(struct vfsmount *root_mnt,
- const char *export_path, struct vfsmount *mnt_target)
+static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
+ const char *export_path)
{
struct nameidata *nd = NULL;
struct mnt_namespace *ns_private;
struct super_block *s;
+ struct dentry *dentry;
int ret;
nd = kmalloc(sizeof(*nd), GFP_KERNEL);
if (nd == NULL)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
ns_private = create_mnt_ns(root_mnt);
ret = PTR_ERR(ns_private);
@@ -2890,32 +2769,27 @@ static int nfs_follow_remote_path(struct vfsmount *root_mnt,
s = nd->path.mnt->mnt_sb;
atomic_inc(&s->s_active);
- mnt_target->mnt_sb = s;
- mnt_target->mnt_root = dget(nd->path.dentry);
-
- /* Correct the device pathname */
- nfs_fix_devname(&nd->path, mnt_target);
+ dentry = dget(nd->path.dentry);
path_put(&nd->path);
kfree(nd);
down_write(&s->s_umount);
- return 0;
+ return dentry;
out_put_mnt_ns:
put_mnt_ns(ns_private);
out_mntput:
mntput(root_mnt);
out_err:
kfree(nd);
- return ret;
+ return ERR_PTR(ret);
}
-static int nfs4_try_mount(int flags, const char *dev_name,
- struct nfs_parsed_mount_data *data,
- struct vfsmount *mnt)
+static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
+ struct nfs_parsed_mount_data *data)
{
char *export_path;
struct vfsmount *root_mnt;
- int error;
+ struct dentry *res;
dfprintk(MOUNT, "--> nfs4_try_mount()\n");
@@ -2925,26 +2799,25 @@ static int nfs4_try_mount(int flags, const char *dev_name,
data->nfs_server.hostname);
data->nfs_server.export_path = export_path;
- error = PTR_ERR(root_mnt);
- if (IS_ERR(root_mnt))
- goto out;
-
- error = nfs_follow_remote_path(root_mnt, export_path, mnt);
+ res = ERR_CAST(root_mnt);
+ if (!IS_ERR(root_mnt))
+ res = nfs_follow_remote_path(root_mnt, export_path);
-out:
- dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
- error != 0 ? " [error]" : "");
- return error;
+ 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 int nfs4_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
+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)
@@ -2952,10 +2825,14 @@ static int nfs4_get_sb(struct file_system_type *fs_type,
/* Validate the mount data */
error = nfs4_validate_mount_data(raw_data, data, dev_name);
- if (error < 0)
+ if (error < 0) {
+ res = ERR_PTR(error);
goto out;
+ }
- error = nfs4_try_mount(flags, dev_name, data, mnt);
+ res = nfs4_try_mount(flags, dev_name, data);
+ if (IS_ERR(res))
+ error = PTR_ERR(res);
out:
kfree(data->client_address);
@@ -2964,9 +2841,9 @@ out:
kfree(data->fscache_uniq);
out_free_data:
kfree(data);
- dprintk("<-- nfs4_get_sb() = %d%s\n", error,
+ dprintk("<-- nfs4_mount() = %d%s\n", error,
error != 0 ? " [error]" : "");
- return error;
+ return res;
}
static void nfs4_kill_super(struct super_block *sb)
@@ -3033,7 +2910,7 @@ nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
nfs_fscache_get_super_cookie(s, NULL, data);
}
- mntroot = nfs4_get_root(s, data->fh);
+ mntroot = nfs4_get_root(s, data->fh, dev_name);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
@@ -3120,7 +2997,7 @@ nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
nfs_fscache_get_super_cookie(s, NULL, data);
}
- mntroot = nfs4_get_root(s, mntfh);
+ mntroot = nfs4_get_root(s, mntfh, dev_name);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
@@ -3160,16 +3037,15 @@ error_splat_bdi:
/*
* Create an NFS4 server record on referral traversal
*/
-static int nfs4_referral_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data,
- struct vfsmount *mnt)
+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;
- int error;
+ struct dentry *res;
- dprintk("--> nfs4_referral_get_sb()\n");
+ dprintk("--> nfs4_referral_mount()\n");
export_path = data->mnt_path;
data->mnt_path = "/";
@@ -3178,15 +3054,13 @@ static int nfs4_referral_get_sb(struct file_system_type *fs_type,
flags, data, data->hostname);
data->mnt_path = export_path;
- error = PTR_ERR(root_mnt);
- if (IS_ERR(root_mnt))
- goto out;
-
- error = nfs_follow_remote_path(root_mnt, export_path, mnt);
-out:
- dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
- error != 0 ? " [error]" : "");
- return error;
+ 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 */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.