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adfs: convert adfs to use the new mount api
Convert the adfs filesystem to use the new mount API. Tested by comparing random mount & remount options before and after the change. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Link: https://lore.kernel.org/r/20240916172735.866916-2-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
9020d0d844
commit
5fadeed64d
182
fs/adfs/super.c
182
fs/adfs/super.c
@ -6,7 +6,8 @@
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/parser.h>
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#include <linux/fs_parser.h>
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#include <linux/fs_context.h>
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#include <linux/mount.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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@ -115,87 +116,61 @@ static int adfs_show_options(struct seq_file *seq, struct dentry *root)
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return 0;
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}
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enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err};
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enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix};
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static const match_table_t tokens = {
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{Opt_uid, "uid=%u"},
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{Opt_gid, "gid=%u"},
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{Opt_ownmask, "ownmask=%o"},
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{Opt_othmask, "othmask=%o"},
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{Opt_ftsuffix, "ftsuffix=%u"},
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{Opt_err, NULL}
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static const struct fs_parameter_spec adfs_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_u32oct ("ownmask", Opt_ownmask),
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fsparam_u32oct ("othmask", Opt_othmask),
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fsparam_u32 ("ftsuffix", Opt_ftsuffix),
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{}
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};
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static int parse_options(struct super_block *sb, struct adfs_sb_info *asb,
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char *options)
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static int adfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
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{
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char *p;
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int option;
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struct adfs_sb_info *asb = fc->s_fs_info;
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struct fs_parse_result result;
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int opt;
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if (!options)
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return 0;
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opt = fs_parse(fc, adfs_param_spec, param, &result);
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if (opt < 0)
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return opt;
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while ((p = strsep(&options, ",")) != NULL) {
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substring_t args[MAX_OPT_ARGS];
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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, tokens, args);
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switch (token) {
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case Opt_uid:
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if (match_int(args, &option))
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return -EINVAL;
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asb->s_uid = make_kuid(current_user_ns(), option);
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if (!uid_valid(asb->s_uid))
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return -EINVAL;
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break;
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case Opt_gid:
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if (match_int(args, &option))
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return -EINVAL;
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asb->s_gid = make_kgid(current_user_ns(), option);
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if (!gid_valid(asb->s_gid))
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return -EINVAL;
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break;
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case Opt_ownmask:
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if (match_octal(args, &option))
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return -EINVAL;
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asb->s_owner_mask = option;
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break;
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case Opt_othmask:
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if (match_octal(args, &option))
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return -EINVAL;
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asb->s_other_mask = option;
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break;
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case Opt_ftsuffix:
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if (match_int(args, &option))
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return -EINVAL;
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asb->s_ftsuffix = option;
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break;
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default:
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adfs_msg(sb, KERN_ERR,
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"unrecognised mount option \"%s\" or missing value",
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p);
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return -EINVAL;
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}
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switch (opt) {
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case Opt_uid:
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asb->s_uid = result.uid;
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break;
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case Opt_gid:
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asb->s_gid = result.gid;
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break;
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case Opt_ownmask:
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asb->s_owner_mask = result.uint_32;
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break;
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case Opt_othmask:
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asb->s_other_mask = result.uint_32;
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break;
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case Opt_ftsuffix:
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asb->s_ftsuffix = result.uint_32;
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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 0;
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}
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static int adfs_remount(struct super_block *sb, int *flags, char *data)
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static int adfs_reconfigure(struct fs_context *fc)
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{
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struct adfs_sb_info temp_asb;
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int ret;
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struct adfs_sb_info *new_asb = fc->s_fs_info;
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struct adfs_sb_info *asb = ADFS_SB(fc->root->d_sb);
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sync_filesystem(sb);
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*flags |= ADFS_SB_FLAGS;
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sync_filesystem(fc->root->d_sb);
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fc->sb_flags |= ADFS_SB_FLAGS;
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temp_asb = *ADFS_SB(sb);
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ret = parse_options(sb, &temp_asb, data);
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if (ret == 0)
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*ADFS_SB(sb) = temp_asb;
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/* Structure copy newly parsed options */
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*asb = *new_asb;
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return ret;
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return 0;
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}
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static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
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@ -273,7 +248,6 @@ static const struct super_operations adfs_sops = {
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.write_inode = adfs_write_inode,
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.put_super = adfs_put_super,
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.statfs = adfs_statfs,
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.remount_fs = adfs_remount,
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.show_options = adfs_show_options,
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};
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@ -361,34 +335,21 @@ static int adfs_validate_dr0(struct super_block *sb, struct buffer_head *bh,
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return 0;
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}
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static int adfs_fill_super(struct super_block *sb, void *data, int silent)
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static int adfs_fill_super(struct super_block *sb, struct fs_context *fc)
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{
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struct adfs_discrecord *dr;
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struct object_info root_obj;
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struct adfs_sb_info *asb;
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struct adfs_sb_info *asb = sb->s_fs_info;
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struct inode *root;
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int ret = -EINVAL;
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int silent = fc->sb_flags & SB_SILENT;
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sb->s_flags |= ADFS_SB_FLAGS;
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asb = kzalloc(sizeof(*asb), GFP_KERNEL);
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if (!asb)
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return -ENOMEM;
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sb->s_fs_info = asb;
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sb->s_magic = ADFS_SUPER_MAGIC;
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sb->s_time_gran = 10000000;
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/* set default options */
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asb->s_uid = GLOBAL_ROOT_UID;
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asb->s_gid = GLOBAL_ROOT_GID;
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asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
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asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
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asb->s_ftsuffix = 0;
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if (parse_options(sb, asb, data))
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goto error;
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/* Try to probe the filesystem boot block */
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ret = adfs_probe(sb, ADFS_DISCRECORD, 1, adfs_validate_bblk);
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if (ret == -EILSEQ)
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@ -453,18 +414,61 @@ static int adfs_fill_super(struct super_block *sb, void *data, int silent)
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return ret;
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}
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static struct dentry *adfs_mount(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data)
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static int adfs_get_tree(struct fs_context *fc)
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{
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return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
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return get_tree_bdev(fc, adfs_fill_super);
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}
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static void adfs_free_fc(struct fs_context *fc)
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{
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struct adfs_context *asb = fc->s_fs_info;
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kfree(asb);
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}
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static const struct fs_context_operations adfs_context_ops = {
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.parse_param = adfs_parse_param,
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.get_tree = adfs_get_tree,
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.reconfigure = adfs_reconfigure,
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.free = adfs_free_fc,
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};
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static int adfs_init_fs_context(struct fs_context *fc)
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{
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struct adfs_sb_info *asb;
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asb = kzalloc(sizeof(struct adfs_sb_info), GFP_KERNEL);
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if (!asb)
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return -ENOMEM;
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if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
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struct super_block *sb = fc->root->d_sb;
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struct adfs_sb_info *old_asb = ADFS_SB(sb);
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/* structure copy existing options before parsing */
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*asb = *old_asb;
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} else {
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/* set default options */
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asb->s_uid = GLOBAL_ROOT_UID;
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asb->s_gid = GLOBAL_ROOT_GID;
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asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
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asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
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asb->s_ftsuffix = 0;
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}
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fc->ops = &adfs_context_ops;
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fc->s_fs_info = asb;
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return 0;
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}
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static struct file_system_type adfs_fs_type = {
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.owner = THIS_MODULE,
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.name = "adfs",
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.mount = adfs_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 = adfs_init_fs_context,
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.parameters = adfs_param_spec,
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};
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MODULE_ALIAS_FS("adfs");
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