diff options
Diffstat (limited to 'fs/hfsplus/options.c')
| -rw-r--r-- | fs/hfsplus/options.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/fs/hfsplus/options.c b/fs/hfsplus/options.c new file mode 100644 index 000000000..9b377481f --- /dev/null +++ b/fs/hfsplus/options.c @@ -0,0 +1,169 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/fs/hfsplus/options.c + * + * Copyright (C) 2001 + * Brad Boyer (flar@allandria.com) + * (C) 2003 Ardis Technologies <roman@ardistech.com> + * + * Option parsing + */ + +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/fs_struct.h> +#include <linux/fs_context.h> +#include <linux/fs_parser.h> +#include <linux/nls.h> +#include <linux/mount.h> +#include <linux/seq_file.h> +#include <linux/slab.h> +#include "hfsplus_fs.h" + +enum { + opt_creator, opt_type, + opt_umask, opt_uid, opt_gid, + opt_part, opt_session, opt_nls, + opt_decompose, opt_barrier, + opt_force, +}; + +static const struct fs_parameter_spec hfs_param_spec[] = { + fsparam_string ("creator", opt_creator), + fsparam_string ("type", opt_type), + fsparam_u32oct ("umask", opt_umask), + fsparam_u32 ("uid", opt_uid), + fsparam_u32 ("gid", opt_gid), + fsparam_u32 ("part", opt_part), + fsparam_u32 ("session", opt_session), + fsparam_string ("nls", opt_nls), + fsparam_flag_no ("decompose", opt_decompose), + fsparam_flag_no ("barrier", opt_barrier), + fsparam_flag ("force", opt_force), + {} +}; + +/* Initialize an options object to reasonable defaults */ +void hfsplus_fill_defaults(struct hfsplus_sb_info *opts) +{ + if (!opts) + return; + + opts->creator = HFSPLUS_DEF_CR_TYPE; + opts->type = HFSPLUS_DEF_CR_TYPE; + opts->umask = current_umask(); + opts->uid = current_uid(); + opts->gid = current_gid(); + opts->part = -1; + opts->session = -1; +} + +/* Parse options from mount. Returns nonzero errno on failure */ +int hfsplus_parse_param(struct fs_context *fc, struct fs_parameter *param) +{ + struct hfsplus_sb_info *sbi = fc->s_fs_info; + struct fs_parse_result result; + int opt; + + /* + * Only the force option is examined during remount, all others + * are ignored. + */ + if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE && + strncmp(param->key, "force", 5)) + return 0; + + opt = fs_parse(fc, hfs_param_spec, param, &result); + if (opt < 0) + return opt; + + switch (opt) { + case opt_creator: + if (strlen(param->string) != 4) { + pr_err("creator requires a 4 character value\n"); + return -EINVAL; + } + memcpy(&sbi->creator, param->string, 4); + break; + case opt_type: + if (strlen(param->string) != 4) { + pr_err("type requires a 4 character value\n"); + return -EINVAL; + } + memcpy(&sbi->type, param->string, 4); + break; + case opt_umask: + sbi->umask = (umode_t)result.uint_32; + break; + case opt_uid: + sbi->uid = result.uid; + set_bit(HFSPLUS_SB_UID, &sbi->flags); + break; + case opt_gid: + sbi->gid = result.gid; + set_bit(HFSPLUS_SB_GID, &sbi->flags); + break; + case opt_part: + sbi->part = result.uint_32; + break; + case opt_session: + sbi->session = result.uint_32; + break; + case opt_nls: + if (sbi->nls) { + pr_err("unable to change nls mapping\n"); + return -EINVAL; + } + sbi->nls = load_nls(param->string); + if (!sbi->nls) { + pr_err("unable to load nls mapping \"%s\"\n", + param->string); + return -EINVAL; + } + break; + case opt_decompose: + if (result.negated) + set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags); + else + clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags); + break; + case opt_barrier: + if (result.negated) + set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags); + else + clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags); + break; + case opt_force: + set_bit(HFSPLUS_SB_FORCE, &sbi->flags); + break; + default: + return -EINVAL; + } + + return 0; +} + +int hfsplus_show_options(struct seq_file *seq, struct dentry *root) +{ + struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb); + + if (sbi->creator != HFSPLUS_DEF_CR_TYPE) + seq_show_option_n(seq, "creator", (char *)&sbi->creator, 4); + if (sbi->type != HFSPLUS_DEF_CR_TYPE) + seq_show_option_n(seq, "type", (char *)&sbi->type, 4); + seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask, + from_kuid_munged(&init_user_ns, sbi->uid), + from_kgid_munged(&init_user_ns, sbi->gid)); + if (sbi->part >= 0) + seq_printf(seq, ",part=%u", sbi->part); + if (sbi->session >= 0) + seq_printf(seq, ",session=%u", sbi->session); + if (sbi->nls) + seq_printf(seq, ",nls=%s", sbi->nls->charset); + if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags)) + seq_puts(seq, ",nodecompose"); + if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) + seq_puts(seq, ",nobarrier"); + return 0; +} |