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239 lines
5.3 KiB
239 lines
5.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/hfsplus/options.c |
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* |
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* Copyright (C) 2001 |
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* Brad Boyer ([email protected]) |
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* (C) 2003 Ardis Technologies <[email protected]> |
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* |
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* Option parsing |
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*/ |
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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/nls.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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#include "hfsplus_fs.h" |
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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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}; |
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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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}; |
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/* Initialize an options object to reasonable defaults */ |
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void hfsplus_fill_defaults(struct hfsplus_sb_info *opts) |
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{ |
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if (!opts) |
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return; |
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opts->creator = HFSPLUS_DEF_CR_TYPE; |
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opts->type = HFSPLUS_DEF_CR_TYPE; |
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opts->umask = current_umask(); |
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opts->uid = current_uid(); |
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opts->gid = current_gid(); |
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opts->part = -1; |
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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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{ |
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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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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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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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case opt_creator: |
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if (match_fourchar(&args[0], &sbi->creator)) { |
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pr_err("creator requires a 4 character value\n"); |
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return 0; |
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} |
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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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pr_err("type requires a 4 character value\n"); |
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return 0; |
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} |
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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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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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} |
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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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} |
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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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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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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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} |
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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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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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} |
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kfree(p); |
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break; |
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case opt_decompose: |
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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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set_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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} |
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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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if (sbi->creator != HFSPLUS_DEF_CR_TYPE) |
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seq_show_option_n(seq, "creator", (char *)&sbi->creator, 4); |
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if (sbi->type != HFSPLUS_DEF_CR_TYPE) |
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seq_show_option_n(seq, "type", (char *)&sbi->type, 4); |
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seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask, |
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from_kuid_munged(&init_user_ns, sbi->uid), |
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from_kgid_munged(&init_user_ns, sbi->gid)); |
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if (sbi->part >= 0) |
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seq_printf(seq, ",part=%u", sbi->part); |
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if (sbi->session >= 0) |
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seq_printf(seq, ",session=%u", sbi->session); |
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if (sbi->nls) |
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seq_printf(seq, ",nls=%s", sbi->nls->charset); |
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if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags)) |
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seq_puts(seq, ",nodecompose"); |
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if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) |
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seq_puts(seq, ",nobarrier"); |
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return 0; |
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}
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