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befs: convert befs to use the new mount api
Convert the befs filesystem to use the new mount API. Tested by comparing random mount & remount options before and after the change. Cc: Luis de Bethencourt <luisbg@kernel.org> Cc: Salah Triki <salah.triki@gmail.com> Signed-off-by: Eric Sandeen <sandeen@redhat.com> Link: https://lore.kernel.org/r/20240916172735.866916-4-sandeen@redhat.com Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Eric Sandeen
Christian Brauner
parent
de25e36d83
commit
c3099e72bf
@ -11,12 +11,13 @@
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/fs_context.h>
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#include <linux/fs_parser.h>
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#include <linux/errno.h>
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#include <linux/stat.h>
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#include <linux/nls.h>
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#include <linux/buffer_head.h>
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#include <linux/vfs.h>
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#include <linux/parser.h>
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#include <linux/namei.h>
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#include <linux/sched.h>
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#include <linux/cred.h>
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@ -54,22 +55,20 @@ static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
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static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
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char **out, int *out_len);
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static void befs_put_super(struct super_block *);
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static int befs_remount(struct super_block *, int *, char *);
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static int befs_statfs(struct dentry *, struct kstatfs *);
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static int befs_show_options(struct seq_file *, struct dentry *);
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static int parse_options(char *, struct befs_mount_options *);
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static struct dentry *befs_fh_to_dentry(struct super_block *sb,
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struct fid *fid, int fh_len, int fh_type);
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static struct dentry *befs_fh_to_parent(struct super_block *sb,
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struct fid *fid, int fh_len, int fh_type);
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static struct dentry *befs_get_parent(struct dentry *child);
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static void befs_free_fc(struct fs_context *fc);
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static const struct super_operations befs_sops = {
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.alloc_inode = befs_alloc_inode, /* allocate a new inode */
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.free_inode = befs_free_inode, /* deallocate an inode */
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.put_super = befs_put_super, /* uninit super */
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.statfs = befs_statfs, /* statfs */
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.remount_fs = befs_remount,
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.show_options = befs_show_options,
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};
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@ -672,92 +671,53 @@ static struct dentry *befs_get_parent(struct dentry *child)
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}
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enum {
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Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
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Opt_uid, Opt_gid, Opt_charset, Opt_debug,
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};
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static const match_table_t befs_tokens = {
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{Opt_uid, "uid=%d"},
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{Opt_gid, "gid=%d"},
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{Opt_charset, "iocharset=%s"},
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{Opt_debug, "debug"},
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{Opt_err, NULL}
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static const struct fs_parameter_spec befs_param_spec[] = {
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fsparam_uid ("uid", Opt_uid),
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fsparam_gid ("gid", Opt_gid),
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fsparam_string ("iocharset", Opt_charset),
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fsparam_flag ("debug", Opt_debug),
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{}
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};
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static int
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parse_options(char *options, struct befs_mount_options *opts)
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befs_parse_param(struct fs_context *fc, struct fs_parameter *param)
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{
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char *p;
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substring_t args[MAX_OPT_ARGS];
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int option;
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kuid_t uid;
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kgid_t gid;
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struct befs_mount_options *opts = fc->fs_private;
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int token;
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struct fs_parse_result result;
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/* Initialize options */
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opts->uid = GLOBAL_ROOT_UID;
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opts->gid = GLOBAL_ROOT_GID;
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opts->use_uid = 0;
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opts->use_gid = 0;
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opts->iocharset = NULL;
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opts->debug = 0;
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/* befs ignores all options on remount */
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if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
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return 0;
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if (!options)
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return 1;
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token = fs_parse(fc, befs_param_spec, param, &result);
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if (token < 0)
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return token;
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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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if (!*p)
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continue;
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token = match_token(p, befs_tokens, args);
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switch (token) {
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case Opt_uid:
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if (match_int(&args[0], &option))
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return 0;
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uid = INVALID_UID;
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if (option >= 0)
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uid = make_kuid(current_user_ns(), option);
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if (!uid_valid(uid)) {
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pr_err("Invalid uid %d, "
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"using default\n", option);
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break;
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}
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opts->uid = uid;
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opts->use_uid = 1;
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break;
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case Opt_gid:
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if (match_int(&args[0], &option))
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return 0;
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gid = INVALID_GID;
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if (option >= 0)
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gid = make_kgid(current_user_ns(), option);
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if (!gid_valid(gid)) {
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pr_err("Invalid gid %d, "
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"using default\n", option);
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break;
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}
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opts->gid = gid;
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opts->use_gid = 1;
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break;
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case Opt_charset:
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kfree(opts->iocharset);
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opts->iocharset = match_strdup(&args[0]);
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if (!opts->iocharset) {
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pr_err("allocation failure for "
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"iocharset string\n");
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return 0;
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}
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break;
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case Opt_debug:
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opts->debug = 1;
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break;
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default:
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pr_err("Unrecognized mount option \"%s\" "
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"or missing value\n", p);
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return 0;
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}
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switch (token) {
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case Opt_uid:
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opts->uid = result.uid;
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opts->use_uid = 1;
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break;
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case Opt_gid:
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opts->gid = result.gid;
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opts->use_gid = 1;
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break;
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case Opt_charset:
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kfree(opts->iocharset);
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opts->iocharset = param->string;
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param->string = NULL;
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break;
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case Opt_debug:
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opts->debug = 1;
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break;
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default:
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return -EINVAL;
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}
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return 1;
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return 0;
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}
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static int befs_show_options(struct seq_file *m, struct dentry *root)
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@ -793,6 +753,21 @@ befs_put_super(struct super_block *sb)
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sb->s_fs_info = NULL;
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}
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/*
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* Copy the parsed options into the sbi mount_options member
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*/
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static void
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befs_set_options(struct befs_sb_info *sbi, struct befs_mount_options *opts)
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{
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sbi->mount_opts.uid = opts->uid;
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sbi->mount_opts.gid = opts->gid;
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sbi->mount_opts.use_uid = opts->use_uid;
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sbi->mount_opts.use_gid = opts->use_gid;
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sbi->mount_opts.debug = opts->debug;
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sbi->mount_opts.iocharset = opts->iocharset;
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opts->iocharset = NULL;
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}
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/* Allocate private field of the superblock, fill it.
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*
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* Finish filling the public superblock fields
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@ -800,7 +775,7 @@ befs_put_super(struct super_block *sb)
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* Load a set of NLS translations if needed.
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*/
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static int
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befs_fill_super(struct super_block *sb, void *data, int silent)
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befs_fill_super(struct super_block *sb, struct fs_context *fc)
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{
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struct buffer_head *bh;
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struct befs_sb_info *befs_sb;
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@ -810,6 +785,8 @@ befs_fill_super(struct super_block *sb, void *data, int silent)
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const unsigned long sb_block = 0;
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const off_t x86_sb_off = 512;
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int blocksize;
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struct befs_mount_options *parsed_opts = fc->fs_private;
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int silent = fc->sb_flags & SB_SILENT;
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sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL);
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if (sb->s_fs_info == NULL)
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@ -817,11 +794,7 @@ befs_fill_super(struct super_block *sb, void *data, int silent)
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befs_sb = BEFS_SB(sb);
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if (!parse_options((char *) data, &befs_sb->mount_opts)) {
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if (!silent)
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befs_error(sb, "cannot parse mount options");
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goto unacquire_priv_sbp;
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}
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befs_set_options(befs_sb, parsed_opts);
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befs_debug(sb, "---> %s", __func__);
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@ -934,10 +907,10 @@ unacquire_none:
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}
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static int
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befs_remount(struct super_block *sb, int *flags, char *data)
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befs_reconfigure(struct fs_context *fc)
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{
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sync_filesystem(sb);
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if (!(*flags & SB_RDONLY))
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sync_filesystem(fc->root->d_sb);
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if (!(fc->sb_flags & SB_RDONLY))
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return -EINVAL;
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return 0;
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}
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@ -965,19 +938,51 @@ befs_statfs(struct dentry *dentry, struct kstatfs *buf)
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return 0;
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}
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static struct dentry *
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befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
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void *data)
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static int befs_get_tree(struct fs_context *fc)
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{
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return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
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return get_tree_bdev(fc, befs_fill_super);
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}
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static const struct fs_context_operations befs_context_ops = {
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.parse_param = befs_parse_param,
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.get_tree = befs_get_tree,
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.reconfigure = befs_reconfigure,
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.free = befs_free_fc,
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};
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static int befs_init_fs_context(struct fs_context *fc)
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{
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struct befs_mount_options *opts;
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opts = kzalloc(sizeof(*opts), GFP_KERNEL);
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if (!opts)
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return -ENOMEM;
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/* Initialize options */
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opts->uid = GLOBAL_ROOT_UID;
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opts->gid = GLOBAL_ROOT_GID;
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fc->fs_private = opts;
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fc->ops = &befs_context_ops;
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return 0;
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}
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static void befs_free_fc(struct fs_context *fc)
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{
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struct befs_mount_options *opts = fc->fs_private;
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kfree(opts->iocharset);
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kfree(fc->fs_private);
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}
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static struct file_system_type befs_fs_type = {
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.owner = THIS_MODULE,
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.name = "befs",
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.mount = befs_mount,
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.kill_sb = kill_block_super,
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.fs_flags = FS_REQUIRES_DEV,
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.init_fs_context = befs_init_fs_context,
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.parameters = befs_param_spec,
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};
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MODULE_ALIAS_FS("befs");
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