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hfsplus: convert hfsplus to use the new mount api
Convert the hfsplus 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/20240916172735.866916-6-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
ffcd06b6d1
commit
432f7c78cb
@ -21,6 +21,7 @@
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#include <linux/mutex.h>
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#include <linux/buffer_head.h>
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#include <linux/blkdev.h>
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#include <linux/fs_context.h>
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#include "hfsplus_raw.h"
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#define DBG_BNODE_REFS 0x00000001
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@ -496,8 +497,7 @@ long hfsplus_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
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/* options.c */
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void hfsplus_fill_defaults(struct hfsplus_sb_info *opts);
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int hfsplus_parse_options_remount(char *input, int *force);
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int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi);
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int hfsplus_parse_param(struct fs_context *fc, struct fs_parameter *param);
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int hfsplus_show_options(struct seq_file *seq, struct dentry *root);
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/* part_tbl.c */
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@ -12,7 +12,8 @@
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/parser.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/nls.h>
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#include <linux/mount.h>
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#include <linux/seq_file.h>
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@ -23,26 +24,23 @@ enum {
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opt_creator, opt_type,
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opt_umask, opt_uid, opt_gid,
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opt_part, opt_session, opt_nls,
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opt_nodecompose, opt_decompose,
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opt_barrier, opt_nobarrier,
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opt_force, opt_err
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opt_decompose, opt_barrier,
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opt_force,
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};
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static const match_table_t tokens = {
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{ opt_creator, "creator=%s" },
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{ opt_type, "type=%s" },
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{ opt_umask, "umask=%o" },
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{ opt_uid, "uid=%u" },
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{ opt_gid, "gid=%u" },
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{ opt_part, "part=%u" },
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{ opt_session, "session=%u" },
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{ opt_nls, "nls=%s" },
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{ opt_decompose, "decompose" },
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{ opt_nodecompose, "nodecompose" },
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{ opt_barrier, "barrier" },
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{ opt_nobarrier, "nobarrier" },
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{ opt_force, "force" },
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{ opt_err, NULL }
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static const struct fs_parameter_spec hfs_param_spec[] = {
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fsparam_string ("creator", opt_creator),
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fsparam_string ("type", opt_type),
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fsparam_u32oct ("umask", opt_umask),
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fsparam_u32 ("uid", opt_uid),
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fsparam_u32 ("gid", opt_gid),
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fsparam_u32 ("part", opt_part),
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fsparam_u32 ("session", opt_session),
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fsparam_string ("nls", opt_nls),
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fsparam_flag_no ("decompose", opt_decompose),
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fsparam_flag_no ("barrier", opt_barrier),
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fsparam_flag ("force", opt_force),
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{}
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};
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/* Initialize an options object to reasonable defaults */
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@ -60,164 +58,91 @@ void hfsplus_fill_defaults(struct hfsplus_sb_info *opts)
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opts->session = -1;
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}
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/* convert a "four byte character" to a 32 bit int with error checks */
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static inline int match_fourchar(substring_t *arg, u32 *result)
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/* Parse options from mount. Returns nonzero errno on failure */
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int hfsplus_parse_param(struct fs_context *fc, struct fs_parameter *param)
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{
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if (arg->to - arg->from != 4)
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return -EINVAL;
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memcpy(result, arg->from, 4);
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struct hfsplus_sb_info *sbi = fc->s_fs_info;
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struct fs_parse_result result;
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int opt;
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/*
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* Only the force option is examined during remount, all others
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* are ignored.
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*/
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if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE &&
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strncmp(param->key, "force", 5))
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return 0;
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}
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int hfsplus_parse_options_remount(char *input, int *force)
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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 token;
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opt = fs_parse(fc, hfs_param_spec, param, &result);
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if (opt < 0)
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return opt;
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if (!input)
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return 1;
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while ((p = strsep(&input, ",")) != NULL) {
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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_force:
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*force = 1;
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break;
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default:
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break;
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}
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}
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return 1;
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}
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/* Parse options from mount. Returns 0 on failure */
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/* input is the options passed to mount() as a string */
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int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
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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 tmp, token;
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if (!input)
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goto done;
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while ((p = strsep(&input, ",")) != NULL) {
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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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switch (opt) {
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case opt_creator:
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if (match_fourchar(&args[0], &sbi->creator)) {
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if (strlen(param->string) != 4) {
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pr_err("creator requires a 4 character value\n");
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return 0;
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return -EINVAL;
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}
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memcpy(&sbi->creator, param->string, 4);
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break;
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case opt_type:
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if (match_fourchar(&args[0], &sbi->type)) {
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if (strlen(param->string) != 4) {
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pr_err("type requires a 4 character value\n");
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return 0;
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return -EINVAL;
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}
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memcpy(&sbi->type, param->string, 4);
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break;
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case opt_umask:
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if (match_octal(&args[0], &tmp)) {
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pr_err("umask requires a value\n");
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return 0;
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}
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sbi->umask = (umode_t)tmp;
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sbi->umask = (umode_t)result.uint_32;
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break;
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case opt_uid:
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if (match_int(&args[0], &tmp)) {
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pr_err("uid requires an argument\n");
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return 0;
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}
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sbi->uid = make_kuid(current_user_ns(), (uid_t)tmp);
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if (!uid_valid(sbi->uid)) {
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pr_err("invalid uid specified\n");
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return 0;
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} else {
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sbi->uid = result.uid;
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set_bit(HFSPLUS_SB_UID, &sbi->flags);
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}
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break;
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case opt_gid:
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if (match_int(&args[0], &tmp)) {
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pr_err("gid requires an argument\n");
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return 0;
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}
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sbi->gid = make_kgid(current_user_ns(), (gid_t)tmp);
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if (!gid_valid(sbi->gid)) {
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pr_err("invalid gid specified\n");
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return 0;
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} else {
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sbi->gid = result.gid;
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set_bit(HFSPLUS_SB_GID, &sbi->flags);
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}
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break;
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case opt_part:
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if (match_int(&args[0], &sbi->part)) {
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pr_err("part requires an argument\n");
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return 0;
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}
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sbi->part = result.uint_32;
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break;
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case opt_session:
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if (match_int(&args[0], &sbi->session)) {
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pr_err("session requires an argument\n");
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return 0;
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}
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sbi->session = result.uint_32;
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break;
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case opt_nls:
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if (sbi->nls) {
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pr_err("unable to change nls mapping\n");
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return 0;
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return -EINVAL;
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}
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p = match_strdup(&args[0]);
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if (p)
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sbi->nls = load_nls(p);
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sbi->nls = load_nls(param->string);
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if (!sbi->nls) {
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pr_err("unable to load nls mapping \"%s\"\n",
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p);
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kfree(p);
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return 0;
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param->string);
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return -EINVAL;
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}
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kfree(p);
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break;
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case opt_decompose:
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if (result.negated)
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set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
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else
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clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
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break;
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case opt_nodecompose:
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set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
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break;
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case opt_barrier:
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clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
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break;
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case opt_nobarrier:
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if (result.negated)
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set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
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else
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clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
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break;
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case opt_force:
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set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
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break;
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default:
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return 0;
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}
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return -EINVAL;
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}
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done:
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if (!sbi->nls) {
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/* try utf8 first, as this is the old default behaviour */
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sbi->nls = load_nls("utf8");
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if (!sbi->nls)
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sbi->nls = load_nls_default();
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if (!sbi->nls)
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return 0;
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}
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return 1;
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}
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int hfsplus_show_options(struct seq_file *seq, struct dentry *root)
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{
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struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb);
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@ -14,6 +14,7 @@
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#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include <linux/fs.h>
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#include <linux/fs_context.h>
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#include <linux/slab.h>
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#include <linux/vfs.h>
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#include <linux/nls.h>
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@ -332,34 +333,33 @@ static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
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return 0;
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}
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static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
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static int hfsplus_reconfigure(struct fs_context *fc)
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{
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sync_filesystem(sb);
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if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
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return 0;
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if (!(*flags & SB_RDONLY)) {
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struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
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int force = 0;
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struct super_block *sb = fc->root->d_sb;
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if (!hfsplus_parse_options_remount(data, &force))
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return -EINVAL;
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sync_filesystem(sb);
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if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb))
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return 0;
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if (!(fc->sb_flags & SB_RDONLY)) {
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struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
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struct hfsplus_vh *vhdr = sbi->s_vhdr;
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if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
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pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n");
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sb->s_flags |= SB_RDONLY;
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*flags |= SB_RDONLY;
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} else if (force) {
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fc->sb_flags |= SB_RDONLY;
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} else if (test_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
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/* nothing */
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} else if (vhdr->attributes &
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cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
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pr_warn("filesystem is marked locked, leaving read-only.\n");
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sb->s_flags |= SB_RDONLY;
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*flags |= SB_RDONLY;
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fc->sb_flags |= SB_RDONLY;
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} else if (vhdr->attributes &
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cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
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pr_warn("filesystem is marked journaled, leaving read-only.\n");
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sb->s_flags |= SB_RDONLY;
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*flags |= SB_RDONLY;
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fc->sb_flags |= SB_RDONLY;
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}
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}
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return 0;
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@ -373,38 +373,33 @@ static const struct super_operations hfsplus_sops = {
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.put_super = hfsplus_put_super,
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.sync_fs = hfsplus_sync_fs,
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.statfs = hfsplus_statfs,
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.remount_fs = hfsplus_remount,
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.show_options = hfsplus_show_options,
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};
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static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
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static int hfsplus_fill_super(struct super_block *sb, struct fs_context *fc)
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{
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struct hfsplus_vh *vhdr;
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struct hfsplus_sb_info *sbi;
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struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
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hfsplus_cat_entry entry;
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struct hfs_find_data fd;
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struct inode *root, *inode;
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struct qstr str;
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struct nls_table *nls = NULL;
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struct nls_table *nls;
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u64 last_fs_block, last_fs_page;
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int silent = fc->sb_flags & SB_SILENT;
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int err;
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err = -ENOMEM;
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sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
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if (!sbi)
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goto out;
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sb->s_fs_info = sbi;
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mutex_init(&sbi->alloc_mutex);
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mutex_init(&sbi->vh_mutex);
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spin_lock_init(&sbi->work_lock);
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INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
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hfsplus_fill_defaults(sbi);
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err = -EINVAL;
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if (!hfsplus_parse_options(data, sbi)) {
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pr_err("unable to parse mount options\n");
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goto out_unload_nls;
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if (!sbi->nls) {
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/* try utf8 first, as this is the old default behaviour */
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sbi->nls = load_nls("utf8");
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if (!sbi->nls)
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sbi->nls = load_nls_default();
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}
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/* temporarily use utf8 to correctly find the hidden dir below */
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@ -616,7 +611,6 @@ out_unload_nls:
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unload_nls(sbi->nls);
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unload_nls(nls);
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kfree(sbi);
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out:
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return err;
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}
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@ -641,18 +635,46 @@ static void hfsplus_free_inode(struct inode *inode)
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#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
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static struct dentry *hfsplus_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 hfsplus_get_tree(struct fs_context *fc)
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{
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return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
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return get_tree_bdev(fc, hfsplus_fill_super);
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}
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static void hfsplus_free_fc(struct fs_context *fc)
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{
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kfree(fc->s_fs_info);
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}
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static const struct fs_context_operations hfsplus_context_ops = {
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.parse_param = hfsplus_parse_param,
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.get_tree = hfsplus_get_tree,
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.reconfigure = hfsplus_reconfigure,
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.free = hfsplus_free_fc,
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};
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static int hfsplus_init_fs_context(struct fs_context *fc)
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{
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struct hfsplus_sb_info *sbi;
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sbi = kzalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
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if (!sbi)
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return -ENOMEM;
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if (fc->purpose != FS_CONTEXT_FOR_RECONFIGURE)
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hfsplus_fill_defaults(sbi);
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fc->s_fs_info = sbi;
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fc->ops = &hfsplus_context_ops;
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return 0;
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}
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static struct file_system_type hfsplus_fs_type = {
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.owner = THIS_MODULE,
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.name = "hfsplus",
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.mount = hfsplus_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 = hfsplus_init_fs_context,
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};
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MODULE_ALIAS_FS("hfsplus");
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