#include <linux/module.h>
#include <linux/slab.h>
#include <linux/fs.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
#include <linux/errno.h>
#include <linux/stat.h>
#include <linux/nls.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>
-#include <linux/parser.h>
#include <linux/namei.h>
#include <linux/sched.h>
#include <linux/cred.h>
static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
char **out, int *out_len);
static void befs_put_super(struct super_block *);
-static int befs_remount(struct super_block *, int *, char *);
static int befs_statfs(struct dentry *, struct kstatfs *);
static int befs_show_options(struct seq_file *, struct dentry *);
-static int parse_options(char *, struct befs_mount_options *);
static struct dentry *befs_fh_to_dentry(struct super_block *sb,
struct fid *fid, int fh_len, int fh_type);
static struct dentry *befs_fh_to_parent(struct super_block *sb,
struct fid *fid, int fh_len, int fh_type);
static struct dentry *befs_get_parent(struct dentry *child);
+static void befs_free_fc(struct fs_context *fc);
static const struct super_operations befs_sops = {
.alloc_inode = befs_alloc_inode, /* allocate a new inode */
.free_inode = befs_free_inode, /* deallocate an inode */
.put_super = befs_put_super, /* uninit super */
.statfs = befs_statfs, /* statfs */
- .remount_fs = befs_remount,
.show_options = befs_show_options,
};
}
enum {
- Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
+ Opt_uid, Opt_gid, Opt_charset, Opt_debug,
};
-static const match_table_t befs_tokens = {
- {Opt_uid, "uid=%d"},
- {Opt_gid, "gid=%d"},
- {Opt_charset, "iocharset=%s"},
- {Opt_debug, "debug"},
- {Opt_err, NULL}
+static const struct fs_parameter_spec befs_param_spec[] = {
+ fsparam_uid ("uid", Opt_uid),
+ fsparam_gid ("gid", Opt_gid),
+ fsparam_string ("iocharset", Opt_charset),
+ fsparam_flag ("debug", Opt_debug),
+ {}
};
static int
-parse_options(char *options, struct befs_mount_options *opts)
+befs_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
- char *p;
- substring_t args[MAX_OPT_ARGS];
- int option;
- kuid_t uid;
- kgid_t gid;
-
- /* Initialize options */
- opts->uid = GLOBAL_ROOT_UID;
- opts->gid = GLOBAL_ROOT_GID;
- opts->use_uid = 0;
- opts->use_gid = 0;
- opts->iocharset = NULL;
- opts->debug = 0;
-
- if (!options)
- return 1;
-
- while ((p = strsep(&options, ",")) != NULL) {
- int token;
-
- if (!*p)
- continue;
-
- token = match_token(p, befs_tokens, args);
- switch (token) {
- case Opt_uid:
- if (match_int(&args[0], &option))
- return 0;
- uid = INVALID_UID;
- if (option >= 0)
- uid = make_kuid(current_user_ns(), option);
- if (!uid_valid(uid)) {
- pr_err("Invalid uid %d, "
- "using default\n", option);
- break;
- }
- opts->uid = uid;
- opts->use_uid = 1;
- break;
- case Opt_gid:
- if (match_int(&args[0], &option))
- return 0;
- gid = INVALID_GID;
- if (option >= 0)
- gid = make_kgid(current_user_ns(), option);
- if (!gid_valid(gid)) {
- pr_err("Invalid gid %d, "
- "using default\n", option);
- break;
- }
- opts->gid = gid;
- opts->use_gid = 1;
- break;
- case Opt_charset:
- kfree(opts->iocharset);
- opts->iocharset = match_strdup(&args[0]);
- if (!opts->iocharset) {
- pr_err("allocation failure for "
- "iocharset string\n");
- return 0;
- }
- break;
- case Opt_debug:
- opts->debug = 1;
- break;
- default:
- pr_err("Unrecognized mount option \"%s\" "
- "or missing value\n", p);
- return 0;
- }
+ struct befs_mount_options *opts = fc->fs_private;
+ int token;
+ struct fs_parse_result result;
+
+ /* befs ignores all options on remount */
+ if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
+ return 0;
+
+ token = fs_parse(fc, befs_param_spec, param, &result);
+ if (token < 0)
+ return token;
+
+ switch (token) {
+ case Opt_uid:
+ opts->uid = result.uid;
+ opts->use_uid = 1;
+ break;
+ case Opt_gid:
+ opts->gid = result.gid;
+ opts->use_gid = 1;
+ break;
+ case Opt_charset:
+ kfree(opts->iocharset);
+ opts->iocharset = param->string;
+ param->string = NULL;
+ break;
+ case Opt_debug:
+ opts->debug = 1;
+ break;
+ default:
+ return -EINVAL;
}
- return 1;
+ return 0;
}
static int befs_show_options(struct seq_file *m, struct dentry *root)
sb->s_fs_info = NULL;
}
+/*
+ * Copy the parsed options into the sbi mount_options member
+ */
+static void
+befs_set_options(struct befs_sb_info *sbi, struct befs_mount_options *opts)
+{
+ sbi->mount_opts.uid = opts->uid;
+ sbi->mount_opts.gid = opts->gid;
+ sbi->mount_opts.use_uid = opts->use_uid;
+ sbi->mount_opts.use_gid = opts->use_gid;
+ sbi->mount_opts.debug = opts->debug;
+ sbi->mount_opts.iocharset = opts->iocharset;
+ opts->iocharset = NULL;
+}
+
/* Allocate private field of the superblock, fill it.
*
* Finish filling the public superblock fields
* Load a set of NLS translations if needed.
*/
static int
-befs_fill_super(struct super_block *sb, void *data, int silent)
+befs_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct buffer_head *bh;
struct befs_sb_info *befs_sb;
const unsigned long sb_block = 0;
const off_t x86_sb_off = 512;
int blocksize;
+ struct befs_mount_options *parsed_opts = fc->fs_private;
+ int silent = fc->sb_flags & SB_SILENT;
sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL);
if (sb->s_fs_info == NULL)
befs_sb = BEFS_SB(sb);
- if (!parse_options((char *) data, &befs_sb->mount_opts)) {
- if (!silent)
- befs_error(sb, "cannot parse mount options");
- goto unacquire_priv_sbp;
- }
+ befs_set_options(befs_sb, parsed_opts);
befs_debug(sb, "---> %s", __func__);
}
static int
-befs_remount(struct super_block *sb, int *flags, char *data)
+befs_reconfigure(struct fs_context *fc)
{
- sync_filesystem(sb);
- if (!(*flags & SB_RDONLY))
+ sync_filesystem(fc->root->d_sb);
+ if (!(fc->sb_flags & SB_RDONLY))
return -EINVAL;
return 0;
}
return 0;
}
-static struct dentry *
-befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
- void *data)
+static int befs_get_tree(struct fs_context *fc)
+{
+ return get_tree_bdev(fc, befs_fill_super);
+}
+
+static const struct fs_context_operations befs_context_ops = {
+ .parse_param = befs_parse_param,
+ .get_tree = befs_get_tree,
+ .reconfigure = befs_reconfigure,
+ .free = befs_free_fc,
+};
+
+static int befs_init_fs_context(struct fs_context *fc)
+{
+ struct befs_mount_options *opts;
+
+ opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+ if (!opts)
+ return -ENOMEM;
+
+ /* Initialize options */
+ opts->uid = GLOBAL_ROOT_UID;
+ opts->gid = GLOBAL_ROOT_GID;
+
+ fc->fs_private = opts;
+ fc->ops = &befs_context_ops;
+
+ return 0;
+}
+
+static void befs_free_fc(struct fs_context *fc)
{
- return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
+ struct befs_mount_options *opts = fc->fs_private;
+
+ kfree(opts->iocharset);
+ kfree(fc->fs_private);
}
static struct file_system_type befs_fs_type = {
.owner = THIS_MODULE,
.name = "befs",
- .mount = befs_mount,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
+ .init_fs_context = befs_init_fs_context,
+ .parameters = befs_param_spec,
};
MODULE_ALIAS_FS("befs");
projects / thirdparty / kernel / linux.git / commitdiff
