1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * linux/fs/hfsplus/options.c |
4 | * |
5 | * Copyright (C) 2001 |
6 | * Brad Boyer (flar@allandria.com) |
7 | * (C) 2003 Ardis Technologies <roman@ardistech.com> |
8 | * |
9 | * Option parsing |
10 | */ |
11 | |
12 | #include <linux/string.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/sched.h> |
15 | #include <linux/parser.h> |
16 | #include <linux/nls.h> |
17 | #include <linux/mount.h> |
18 | #include <linux/seq_file.h> |
19 | #include <linux/slab.h> |
20 | #include "hfsplus_fs.h" |
21 | |
22 | enum { |
23 | opt_creator, opt_type, |
24 | opt_umask, opt_uid, opt_gid, |
25 | opt_part, opt_session, opt_nls, |
26 | opt_nodecompose, opt_decompose, |
27 | opt_barrier, opt_nobarrier, |
28 | opt_force, opt_err |
29 | }; |
30 | |
31 | static const match_table_t tokens = { |
32 | { opt_creator, "creator=%s" }, |
33 | { opt_type, "type=%s" }, |
34 | { opt_umask, "umask=%o" }, |
35 | { opt_uid, "uid=%u" }, |
36 | { opt_gid, "gid=%u" }, |
37 | { opt_part, "part=%u" }, |
38 | { opt_session, "session=%u" }, |
39 | { opt_nls, "nls=%s" }, |
40 | { opt_decompose, "decompose" }, |
41 | { opt_nodecompose, "nodecompose" }, |
42 | { opt_barrier, "barrier" }, |
43 | { opt_nobarrier, "nobarrier" }, |
44 | { opt_force, "force" }, |
45 | { opt_err, NULL } |
46 | }; |
47 | |
48 | /* Initialize an options object to reasonable defaults */ |
49 | void hfsplus_fill_defaults(struct hfsplus_sb_info *opts) |
50 | { |
51 | if (!opts) |
52 | return; |
53 | |
54 | opts->creator = HFSPLUS_DEF_CR_TYPE; |
55 | opts->type = HFSPLUS_DEF_CR_TYPE; |
56 | opts->umask = current_umask(); |
57 | opts->uid = current_uid(); |
58 | opts->gid = current_gid(); |
59 | opts->part = -1; |
60 | opts->session = -1; |
61 | } |
62 | |
63 | /* convert a "four byte character" to a 32 bit int with error checks */ |
64 | static inline int match_fourchar(substring_t *arg, u32 *result) |
65 | { |
66 | if (arg->to - arg->from != 4) |
67 | return -EINVAL; |
68 | memcpy(result, arg->from, 4); |
69 | return 0; |
70 | } |
71 | |
72 | int hfsplus_parse_options_remount(char *input, int *force) |
73 | { |
74 | char *p; |
75 | substring_t args[MAX_OPT_ARGS]; |
76 | int token; |
77 | |
78 | if (!input) |
79 | return 1; |
80 | |
81 | while ((p = strsep(&input, "," )) != NULL) { |
82 | if (!*p) |
83 | continue; |
84 | |
85 | token = match_token(p, table: tokens, args); |
86 | switch (token) { |
87 | case opt_force: |
88 | *force = 1; |
89 | break; |
90 | default: |
91 | break; |
92 | } |
93 | } |
94 | |
95 | return 1; |
96 | } |
97 | |
98 | /* Parse options from mount. Returns 0 on failure */ |
99 | /* input is the options passed to mount() as a string */ |
100 | int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi) |
101 | { |
102 | char *p; |
103 | substring_t args[MAX_OPT_ARGS]; |
104 | int tmp, token; |
105 | |
106 | if (!input) |
107 | goto done; |
108 | |
109 | while ((p = strsep(&input, "," )) != NULL) { |
110 | if (!*p) |
111 | continue; |
112 | |
113 | token = match_token(p, table: tokens, args); |
114 | switch (token) { |
115 | case opt_creator: |
116 | if (match_fourchar(arg: &args[0], result: &sbi->creator)) { |
117 | pr_err("creator requires a 4 character value\n" ); |
118 | return 0; |
119 | } |
120 | break; |
121 | case opt_type: |
122 | if (match_fourchar(arg: &args[0], result: &sbi->type)) { |
123 | pr_err("type requires a 4 character value\n" ); |
124 | return 0; |
125 | } |
126 | break; |
127 | case opt_umask: |
128 | if (match_octal(&args[0], result: &tmp)) { |
129 | pr_err("umask requires a value\n" ); |
130 | return 0; |
131 | } |
132 | sbi->umask = (umode_t)tmp; |
133 | break; |
134 | case opt_uid: |
135 | if (match_int(&args[0], result: &tmp)) { |
136 | pr_err("uid requires an argument\n" ); |
137 | return 0; |
138 | } |
139 | sbi->uid = make_kuid(current_user_ns(), uid: (uid_t)tmp); |
140 | if (!uid_valid(uid: sbi->uid)) { |
141 | pr_err("invalid uid specified\n" ); |
142 | return 0; |
143 | } else { |
144 | set_bit(HFSPLUS_SB_UID, addr: &sbi->flags); |
145 | } |
146 | break; |
147 | case opt_gid: |
148 | if (match_int(&args[0], result: &tmp)) { |
149 | pr_err("gid requires an argument\n" ); |
150 | return 0; |
151 | } |
152 | sbi->gid = make_kgid(current_user_ns(), gid: (gid_t)tmp); |
153 | if (!gid_valid(gid: sbi->gid)) { |
154 | pr_err("invalid gid specified\n" ); |
155 | return 0; |
156 | } else { |
157 | set_bit(HFSPLUS_SB_GID, addr: &sbi->flags); |
158 | } |
159 | break; |
160 | case opt_part: |
161 | if (match_int(&args[0], result: &sbi->part)) { |
162 | pr_err("part requires an argument\n" ); |
163 | return 0; |
164 | } |
165 | break; |
166 | case opt_session: |
167 | if (match_int(&args[0], result: &sbi->session)) { |
168 | pr_err("session requires an argument\n" ); |
169 | return 0; |
170 | } |
171 | break; |
172 | case opt_nls: |
173 | if (sbi->nls) { |
174 | pr_err("unable to change nls mapping\n" ); |
175 | return 0; |
176 | } |
177 | p = match_strdup(&args[0]); |
178 | if (p) |
179 | sbi->nls = load_nls(charset: p); |
180 | if (!sbi->nls) { |
181 | pr_err("unable to load nls mapping \"%s\"\n" , |
182 | p); |
183 | kfree(objp: p); |
184 | return 0; |
185 | } |
186 | kfree(objp: p); |
187 | break; |
188 | case opt_decompose: |
189 | clear_bit(HFSPLUS_SB_NODECOMPOSE, addr: &sbi->flags); |
190 | break; |
191 | case opt_nodecompose: |
192 | set_bit(HFSPLUS_SB_NODECOMPOSE, addr: &sbi->flags); |
193 | break; |
194 | case opt_barrier: |
195 | clear_bit(HFSPLUS_SB_NOBARRIER, addr: &sbi->flags); |
196 | break; |
197 | case opt_nobarrier: |
198 | set_bit(HFSPLUS_SB_NOBARRIER, addr: &sbi->flags); |
199 | break; |
200 | case opt_force: |
201 | set_bit(HFSPLUS_SB_FORCE, addr: &sbi->flags); |
202 | break; |
203 | default: |
204 | return 0; |
205 | } |
206 | } |
207 | |
208 | done: |
209 | if (!sbi->nls) { |
210 | /* try utf8 first, as this is the old default behaviour */ |
211 | sbi->nls = load_nls(charset: "utf8" ); |
212 | if (!sbi->nls) |
213 | sbi->nls = load_nls_default(); |
214 | if (!sbi->nls) |
215 | return 0; |
216 | } |
217 | |
218 | return 1; |
219 | } |
220 | |
221 | int hfsplus_show_options(struct seq_file *seq, struct dentry *root) |
222 | { |
223 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb: root->d_sb); |
224 | |
225 | if (sbi->creator != HFSPLUS_DEF_CR_TYPE) |
226 | seq_show_option_n(seq, "creator" , (char *)&sbi->creator, 4); |
227 | if (sbi->type != HFSPLUS_DEF_CR_TYPE) |
228 | seq_show_option_n(seq, "type" , (char *)&sbi->type, 4); |
229 | seq_printf(m: seq, fmt: ",umask=%o,uid=%u,gid=%u" , sbi->umask, |
230 | from_kuid_munged(to: &init_user_ns, uid: sbi->uid), |
231 | from_kgid_munged(to: &init_user_ns, gid: sbi->gid)); |
232 | if (sbi->part >= 0) |
233 | seq_printf(m: seq, fmt: ",part=%u" , sbi->part); |
234 | if (sbi->session >= 0) |
235 | seq_printf(m: seq, fmt: ",session=%u" , sbi->session); |
236 | if (sbi->nls) |
237 | seq_printf(m: seq, fmt: ",nls=%s" , sbi->nls->charset); |
238 | if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags)) |
239 | seq_puts(m: seq, s: ",nodecompose" ); |
240 | if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) |
241 | seq_puts(m: seq, s: ",nobarrier" ); |
242 | return 0; |
243 | } |
244 | |