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2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1e51764a AB |
2 | /* |
3 | * This file is part of UBIFS. | |
4 | * | |
5 | * Copyright (C) 2006-2008 Nokia Corporation. | |
6 | * | |
1e51764a AB |
7 | * Authors: Artem Bityutskiy (Битюцкий Артём) |
8 | * Adrian Hunter | |
9 | */ | |
10 | ||
11 | /* | |
12 | * This file implements UBIFS superblock. The superblock is stored at the first | |
13 | * LEB of the volume and is never changed by UBIFS. Only user-space tools may | |
14 | * change it. The superblock node mostly contains geometry information. | |
15 | */ | |
16 | ||
17 | #include "ubifs.h" | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
4d61db4f | 19 | #include <linux/math64.h> |
8da4b8c4 | 20 | #include <linux/uuid.h> |
1e51764a AB |
21 | |
22 | /* | |
23 | * Default journal size in logical eraseblocks as a percent of total | |
24 | * flash size. | |
25 | */ | |
26 | #define DEFAULT_JNL_PERCENT 5 | |
27 | ||
28 | /* Default maximum journal size in bytes */ | |
29 | #define DEFAULT_MAX_JNL (32*1024*1024) | |
30 | ||
31 | /* Default indexing tree fanout */ | |
32 | #define DEFAULT_FANOUT 8 | |
33 | ||
34 | /* Default number of data journal heads */ | |
35 | #define DEFAULT_JHEADS_CNT 1 | |
36 | ||
37 | /* Default positions of different LEBs in the main area */ | |
38 | #define DEFAULT_IDX_LEB 0 | |
39 | #define DEFAULT_DATA_LEB 1 | |
40 | #define DEFAULT_GC_LEB 2 | |
41 | ||
42 | /* Default number of LEB numbers in LPT's save table */ | |
43 | #define DEFAULT_LSAVE_CNT 256 | |
44 | ||
45 | /* Default reserved pool size as a percent of maximum free space */ | |
46 | #define DEFAULT_RP_PERCENT 5 | |
47 | ||
48 | /* The default maximum size of reserved pool in bytes */ | |
49 | #define DEFAULT_MAX_RP_SIZE (5*1024*1024) | |
50 | ||
51 | /* Default time granularity in nanoseconds */ | |
52 | #define DEFAULT_TIME_GRAN 1000000000 | |
53 | ||
d62e98ed GJ |
54 | static int get_default_compressor(struct ubifs_info *c) |
55 | { | |
ba4884a6 RS |
56 | if (ubifs_compr_present(c, UBIFS_COMPR_ZSTD)) |
57 | return UBIFS_COMPR_ZSTD; | |
58 | ||
d62e98ed GJ |
59 | if (ubifs_compr_present(c, UBIFS_COMPR_LZO)) |
60 | return UBIFS_COMPR_LZO; | |
61 | ||
62 | if (ubifs_compr_present(c, UBIFS_COMPR_ZLIB)) | |
63 | return UBIFS_COMPR_ZLIB; | |
64 | ||
65 | return UBIFS_COMPR_NONE; | |
66 | } | |
67 | ||
1e51764a AB |
68 | /** |
69 | * create_default_filesystem - format empty UBI volume. | |
70 | * @c: UBIFS file-system description object | |
71 | * | |
72 | * This function creates default empty file-system. Returns zero in case of | |
73 | * success and a negative error code in case of failure. | |
74 | */ | |
75 | static int create_default_filesystem(struct ubifs_info *c) | |
76 | { | |
77 | struct ubifs_sb_node *sup; | |
78 | struct ubifs_mst_node *mst; | |
79 | struct ubifs_idx_node *idx; | |
80 | struct ubifs_branch *br; | |
81 | struct ubifs_ino_node *ino; | |
82 | struct ubifs_cs_node *cs; | |
83 | union ubifs_key key; | |
84 | int err, tmp, jnl_lebs, log_lebs, max_buds, main_lebs, main_first; | |
85 | int lpt_lebs, lpt_first, orph_lebs, big_lpt, ino_waste, sup_flags = 0; | |
86 | int min_leb_cnt = UBIFS_MIN_LEB_CNT; | |
c4de6d7e | 87 | int idx_node_size; |
4d61db4f | 88 | long long tmp64, main_bytes; |
0ecb9529 | 89 | __le64 tmp_le64; |
0eca0b80 | 90 | struct timespec64 ts; |
104115a3 | 91 | u8 hash[UBIFS_HASH_ARR_SZ]; |
b5b1f083 | 92 | u8 hash_lpt[UBIFS_HASH_ARR_SZ]; |
1e51764a AB |
93 | |
94 | /* Some functions called from here depend on the @c->key_len filed */ | |
95 | c->key_len = UBIFS_SK_LEN; | |
96 | ||
97 | /* | |
98 | * First of all, we have to calculate default file-system geometry - | |
99 | * log size, journal size, etc. | |
100 | */ | |
101 | if (c->leb_cnt < 0x7FFFFFFF / DEFAULT_JNL_PERCENT) | |
102 | /* We can first multiply then divide and have no overflow */ | |
103 | jnl_lebs = c->leb_cnt * DEFAULT_JNL_PERCENT / 100; | |
104 | else | |
105 | jnl_lebs = (c->leb_cnt / 100) * DEFAULT_JNL_PERCENT; | |
106 | ||
107 | if (jnl_lebs < UBIFS_MIN_JNL_LEBS) | |
108 | jnl_lebs = UBIFS_MIN_JNL_LEBS; | |
109 | if (jnl_lebs * c->leb_size > DEFAULT_MAX_JNL) | |
110 | jnl_lebs = DEFAULT_MAX_JNL / c->leb_size; | |
111 | ||
112 | /* | |
113 | * The log should be large enough to fit reference nodes for all bud | |
114 | * LEBs. Because buds do not have to start from the beginning of LEBs | |
115 | * (half of the LEB may contain committed data), the log should | |
116 | * generally be larger, make it twice as large. | |
117 | */ | |
118 | tmp = 2 * (c->ref_node_alsz * jnl_lebs) + c->leb_size - 1; | |
119 | log_lebs = tmp / c->leb_size; | |
120 | /* Plus one LEB reserved for commit */ | |
121 | log_lebs += 1; | |
122 | if (c->leb_cnt - min_leb_cnt > 8) { | |
123 | /* And some extra space to allow writes while committing */ | |
124 | log_lebs += 1; | |
125 | min_leb_cnt += 1; | |
126 | } | |
127 | ||
128 | max_buds = jnl_lebs - log_lebs; | |
129 | if (max_buds < UBIFS_MIN_BUD_LEBS) | |
130 | max_buds = UBIFS_MIN_BUD_LEBS; | |
131 | ||
132 | /* | |
133 | * Orphan nodes are stored in a separate area. One node can store a lot | |
134 | * of orphan inode numbers, but when new orphan comes we just add a new | |
135 | * orphan node. At some point the nodes are consolidated into one | |
136 | * orphan node. | |
137 | */ | |
138 | orph_lebs = UBIFS_MIN_ORPH_LEBS; | |
1e51764a AB |
139 | if (c->leb_cnt - min_leb_cnt > 1) |
140 | /* | |
141 | * For debugging purposes it is better to have at least 2 | |
142 | * orphan LEBs, because the orphan subsystem would need to do | |
143 | * consolidations and would be stressed more. | |
144 | */ | |
145 | orph_lebs += 1; | |
1e51764a AB |
146 | |
147 | main_lebs = c->leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS - log_lebs; | |
148 | main_lebs -= orph_lebs; | |
149 | ||
150 | lpt_first = UBIFS_LOG_LNUM + log_lebs; | |
151 | c->lsave_cnt = DEFAULT_LSAVE_CNT; | |
152 | c->max_leb_cnt = c->leb_cnt; | |
153 | err = ubifs_create_dflt_lpt(c, &main_lebs, lpt_first, &lpt_lebs, | |
b5b1f083 | 154 | &big_lpt, hash_lpt); |
1e51764a AB |
155 | if (err) |
156 | return err; | |
157 | ||
158 | dbg_gen("LEB Properties Tree created (LEBs %d-%d)", lpt_first, | |
159 | lpt_first + lpt_lebs - 1); | |
160 | ||
161 | main_first = c->leb_cnt - main_lebs; | |
162 | ||
c4de6d7e SH |
163 | sup = kzalloc(ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size), GFP_KERNEL); |
164 | mst = kzalloc(c->mst_node_alsz, GFP_KERNEL); | |
165 | idx_node_size = ubifs_idx_node_sz(c, 1); | |
edec5137 | 166 | idx = kzalloc(ALIGN(idx_node_size, c->min_io_size), GFP_KERNEL); |
c4de6d7e SH |
167 | ino = kzalloc(ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size), GFP_KERNEL); |
168 | cs = kzalloc(ALIGN(UBIFS_CS_NODE_SZ, c->min_io_size), GFP_KERNEL); | |
169 | ||
170 | if (!sup || !mst || !idx || !ino || !cs) { | |
171 | err = -ENOMEM; | |
172 | goto out; | |
173 | } | |
174 | ||
1e51764a | 175 | /* Create default superblock */ |
1e51764a | 176 | |
4d61db4f | 177 | tmp64 = (long long)max_buds * c->leb_size; |
1e51764a AB |
178 | if (big_lpt) |
179 | sup_flags |= UBIFS_FLG_BIGLPT; | |
a7a8f4a1 MK |
180 | if (ubifs_default_version > 4) |
181 | sup_flags |= UBIFS_FLG_DOUBLE_HASH; | |
1e51764a | 182 | |
104115a3 SH |
183 | if (ubifs_authenticated(c)) { |
184 | sup_flags |= UBIFS_FLG_AUTHENTICATION; | |
185 | sup->hash_algo = cpu_to_le16(c->auth_hash_algo); | |
186 | err = ubifs_hmac_wkm(c, sup->hmac_wkm); | |
187 | if (err) | |
188 | goto out; | |
189 | } else { | |
7cc7720f | 190 | sup->hash_algo = cpu_to_le16(0xffff); |
104115a3 SH |
191 | } |
192 | ||
1e51764a AB |
193 | sup->ch.node_type = UBIFS_SB_NODE; |
194 | sup->key_hash = UBIFS_KEY_HASH_R5; | |
195 | sup->flags = cpu_to_le32(sup_flags); | |
196 | sup->min_io_size = cpu_to_le32(c->min_io_size); | |
197 | sup->leb_size = cpu_to_le32(c->leb_size); | |
198 | sup->leb_cnt = cpu_to_le32(c->leb_cnt); | |
199 | sup->max_leb_cnt = cpu_to_le32(c->max_leb_cnt); | |
200 | sup->max_bud_bytes = cpu_to_le64(tmp64); | |
201 | sup->log_lebs = cpu_to_le32(log_lebs); | |
202 | sup->lpt_lebs = cpu_to_le32(lpt_lebs); | |
203 | sup->orph_lebs = cpu_to_le32(orph_lebs); | |
204 | sup->jhead_cnt = cpu_to_le32(DEFAULT_JHEADS_CNT); | |
205 | sup->fanout = cpu_to_le32(DEFAULT_FANOUT); | |
206 | sup->lsave_cnt = cpu_to_le32(c->lsave_cnt); | |
a7a8f4a1 | 207 | sup->fmt_version = cpu_to_le32(ubifs_default_version); |
1e51764a | 208 | sup->time_gran = cpu_to_le32(DEFAULT_TIME_GRAN); |
553dea4d AB |
209 | if (c->mount_opts.override_compr) |
210 | sup->default_compr = cpu_to_le16(c->mount_opts.compr_type); | |
211 | else | |
d62e98ed | 212 | sup->default_compr = cpu_to_le16(get_default_compressor(c)); |
1e51764a AB |
213 | |
214 | generate_random_uuid(sup->uuid); | |
215 | ||
4d61db4f AB |
216 | main_bytes = (long long)main_lebs * c->leb_size; |
217 | tmp64 = div_u64(main_bytes * DEFAULT_RP_PERCENT, 100); | |
1e51764a AB |
218 | if (tmp64 > DEFAULT_MAX_RP_SIZE) |
219 | tmp64 = DEFAULT_MAX_RP_SIZE; | |
220 | sup->rp_size = cpu_to_le64(tmp64); | |
963f0cf6 | 221 | sup->ro_compat_version = cpu_to_le32(UBIFS_RO_COMPAT_VERSION); |
1e51764a | 222 | |
1e51764a AB |
223 | dbg_gen("default superblock created at LEB 0:0"); |
224 | ||
225 | /* Create default master node */ | |
1e51764a AB |
226 | |
227 | mst->ch.node_type = UBIFS_MST_NODE; | |
228 | mst->log_lnum = cpu_to_le32(UBIFS_LOG_LNUM); | |
229 | mst->highest_inum = cpu_to_le64(UBIFS_FIRST_INO); | |
230 | mst->cmt_no = 0; | |
231 | mst->root_lnum = cpu_to_le32(main_first + DEFAULT_IDX_LEB); | |
232 | mst->root_offs = 0; | |
233 | tmp = ubifs_idx_node_sz(c, 1); | |
234 | mst->root_len = cpu_to_le32(tmp); | |
235 | mst->gc_lnum = cpu_to_le32(main_first + DEFAULT_GC_LEB); | |
236 | mst->ihead_lnum = cpu_to_le32(main_first + DEFAULT_IDX_LEB); | |
237 | mst->ihead_offs = cpu_to_le32(ALIGN(tmp, c->min_io_size)); | |
238 | mst->index_size = cpu_to_le64(ALIGN(tmp, 8)); | |
239 | mst->lpt_lnum = cpu_to_le32(c->lpt_lnum); | |
240 | mst->lpt_offs = cpu_to_le32(c->lpt_offs); | |
241 | mst->nhead_lnum = cpu_to_le32(c->nhead_lnum); | |
242 | mst->nhead_offs = cpu_to_le32(c->nhead_offs); | |
243 | mst->ltab_lnum = cpu_to_le32(c->ltab_lnum); | |
244 | mst->ltab_offs = cpu_to_le32(c->ltab_offs); | |
245 | mst->lsave_lnum = cpu_to_le32(c->lsave_lnum); | |
246 | mst->lsave_offs = cpu_to_le32(c->lsave_offs); | |
247 | mst->lscan_lnum = cpu_to_le32(main_first); | |
248 | mst->empty_lebs = cpu_to_le32(main_lebs - 2); | |
249 | mst->idx_lebs = cpu_to_le32(1); | |
250 | mst->leb_cnt = cpu_to_le32(c->leb_cnt); | |
104115a3 | 251 | ubifs_copy_hash(c, hash_lpt, mst->hash_lpt); |
1e51764a AB |
252 | |
253 | /* Calculate lprops statistics */ | |
254 | tmp64 = main_bytes; | |
255 | tmp64 -= ALIGN(ubifs_idx_node_sz(c, 1), c->min_io_size); | |
256 | tmp64 -= ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size); | |
257 | mst->total_free = cpu_to_le64(tmp64); | |
258 | ||
259 | tmp64 = ALIGN(ubifs_idx_node_sz(c, 1), c->min_io_size); | |
260 | ino_waste = ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size) - | |
261 | UBIFS_INO_NODE_SZ; | |
262 | tmp64 += ino_waste; | |
263 | tmp64 -= ALIGN(ubifs_idx_node_sz(c, 1), 8); | |
264 | mst->total_dirty = cpu_to_le64(tmp64); | |
265 | ||
266 | /* The indexing LEB does not contribute to dark space */ | |
7606f85a | 267 | tmp64 = ((long long)(c->main_lebs - 1) * c->dark_wm); |
1e51764a AB |
268 | mst->total_dark = cpu_to_le64(tmp64); |
269 | ||
270 | mst->total_used = cpu_to_le64(UBIFS_INO_NODE_SZ); | |
271 | ||
1e51764a AB |
272 | dbg_gen("default master node created at LEB %d:0", UBIFS_MST_LNUM); |
273 | ||
274 | /* Create the root indexing node */ | |
1e51764a AB |
275 | |
276 | c->key_fmt = UBIFS_SIMPLE_KEY_FMT; | |
277 | c->key_hash = key_r5_hash; | |
278 | ||
279 | idx->ch.node_type = UBIFS_IDX_NODE; | |
280 | idx->child_cnt = cpu_to_le16(1); | |
281 | ino_key_init(c, &key, UBIFS_ROOT_INO); | |
282 | br = ubifs_idx_branch(c, idx, 0); | |
283 | key_write_idx(c, &key, &br->key); | |
284 | br->lnum = cpu_to_le32(main_first + DEFAULT_DATA_LEB); | |
285 | br->len = cpu_to_le32(UBIFS_INO_NODE_SZ); | |
1e51764a AB |
286 | |
287 | dbg_gen("default root indexing node created LEB %d:0", | |
288 | main_first + DEFAULT_IDX_LEB); | |
289 | ||
290 | /* Create default root inode */ | |
1e51764a AB |
291 | |
292 | ino_key_init_flash(c, &ino->key, UBIFS_ROOT_INO); | |
293 | ino->ch.node_type = UBIFS_INO_NODE; | |
294 | ino->creat_sqnum = cpu_to_le64(++c->max_sqnum); | |
295 | ino->nlink = cpu_to_le32(2); | |
607a11ad | 296 | |
1bfad0c0 | 297 | ktime_get_coarse_real_ts64(&ts); |
607a11ad | 298 | tmp_le64 = cpu_to_le64(ts.tv_sec); |
0ecb9529 HH |
299 | ino->atime_sec = tmp_le64; |
300 | ino->ctime_sec = tmp_le64; | |
301 | ino->mtime_sec = tmp_le64; | |
1bfad0c0 DD |
302 | ino->atime_nsec = 0; |
303 | ino->ctime_nsec = 0; | |
304 | ino->mtime_nsec = 0; | |
1e51764a AB |
305 | ino->mode = cpu_to_le32(S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO); |
306 | ino->size = cpu_to_le64(UBIFS_INO_NODE_SZ); | |
307 | ||
308 | /* Set compression enabled by default */ | |
309 | ino->flags = cpu_to_le32(UBIFS_COMPR_FL); | |
310 | ||
1e51764a AB |
311 | dbg_gen("root inode created at LEB %d:0", |
312 | main_first + DEFAULT_DATA_LEB); | |
313 | ||
314 | /* | |
315 | * The first node in the log has to be the commit start node. This is | |
316 | * always the case during normal file-system operation. Write a fake | |
317 | * commit start node to the log. | |
318 | */ | |
1e51764a AB |
319 | |
320 | cs->ch.node_type = UBIFS_CS_NODE; | |
c4de6d7e | 321 | |
104115a3 SH |
322 | err = ubifs_write_node_hmac(c, sup, UBIFS_SB_NODE_SZ, 0, 0, |
323 | offsetof(struct ubifs_sb_node, hmac)); | |
c4de6d7e SH |
324 | if (err) |
325 | goto out; | |
326 | ||
104115a3 SH |
327 | err = ubifs_write_node(c, ino, UBIFS_INO_NODE_SZ, |
328 | main_first + DEFAULT_DATA_LEB, 0); | |
c4de6d7e SH |
329 | if (err) |
330 | goto out; | |
331 | ||
104115a3 SH |
332 | ubifs_node_calc_hash(c, ino, hash); |
333 | ubifs_copy_hash(c, hash, ubifs_branch_hash(c, br)); | |
334 | ||
335 | err = ubifs_write_node(c, idx, idx_node_size, main_first + DEFAULT_IDX_LEB, 0); | |
c4de6d7e SH |
336 | if (err) |
337 | goto out; | |
338 | ||
104115a3 SH |
339 | ubifs_node_calc_hash(c, idx, hash); |
340 | ubifs_copy_hash(c, hash, mst->hash_root_idx); | |
341 | ||
342 | err = ubifs_write_node_hmac(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM, 0, | |
343 | offsetof(struct ubifs_mst_node, hmac)); | |
c4de6d7e SH |
344 | if (err) |
345 | goto out; | |
346 | ||
104115a3 SH |
347 | err = ubifs_write_node_hmac(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1, |
348 | 0, offsetof(struct ubifs_mst_node, hmac)); | |
c4de6d7e SH |
349 | if (err) |
350 | goto out; | |
351 | ||
b36a261e | 352 | err = ubifs_write_node(c, cs, UBIFS_CS_NODE_SZ, UBIFS_LOG_LNUM, 0); |
6dcfb802 | 353 | if (err) |
c4de6d7e | 354 | goto out; |
1e51764a | 355 | |
235c362b | 356 | ubifs_msg(c, "default file-system created"); |
c4de6d7e SH |
357 | |
358 | err = 0; | |
359 | out: | |
360 | kfree(sup); | |
361 | kfree(mst); | |
362 | kfree(idx); | |
363 | kfree(ino); | |
364 | kfree(cs); | |
365 | ||
366 | return err; | |
1e51764a AB |
367 | } |
368 | ||
369 | /** | |
370 | * validate_sb - validate superblock node. | |
371 | * @c: UBIFS file-system description object | |
372 | * @sup: superblock node | |
373 | * | |
374 | * This function validates superblock node @sup. Since most of data was read | |
375 | * from the superblock and stored in @c, the function validates fields in @c | |
376 | * instead. Returns zero in case of success and %-EINVAL in case of validation | |
377 | * failure. | |
378 | */ | |
379 | static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup) | |
380 | { | |
381 | long long max_bytes; | |
382 | int err = 1, min_leb_cnt; | |
383 | ||
384 | if (!c->key_hash) { | |
385 | err = 2; | |
386 | goto failed; | |
387 | } | |
388 | ||
389 | if (sup->key_fmt != UBIFS_SIMPLE_KEY_FMT) { | |
390 | err = 3; | |
391 | goto failed; | |
392 | } | |
393 | ||
394 | if (le32_to_cpu(sup->min_io_size) != c->min_io_size) { | |
235c362b | 395 | ubifs_err(c, "min. I/O unit mismatch: %d in superblock, %d real", |
1e51764a AB |
396 | le32_to_cpu(sup->min_io_size), c->min_io_size); |
397 | goto failed; | |
398 | } | |
399 | ||
400 | if (le32_to_cpu(sup->leb_size) != c->leb_size) { | |
235c362b | 401 | ubifs_err(c, "LEB size mismatch: %d in superblock, %d real", |
1e51764a AB |
402 | le32_to_cpu(sup->leb_size), c->leb_size); |
403 | goto failed; | |
404 | } | |
405 | ||
406 | if (c->log_lebs < UBIFS_MIN_LOG_LEBS || | |
407 | c->lpt_lebs < UBIFS_MIN_LPT_LEBS || | |
408 | c->orph_lebs < UBIFS_MIN_ORPH_LEBS || | |
409 | c->main_lebs < UBIFS_MIN_MAIN_LEBS) { | |
410 | err = 4; | |
411 | goto failed; | |
412 | } | |
413 | ||
414 | /* | |
415 | * Calculate minimum allowed amount of main area LEBs. This is very | |
416 | * similar to %UBIFS_MIN_LEB_CNT, but we take into account real what we | |
417 | * have just read from the superblock. | |
418 | */ | |
419 | min_leb_cnt = UBIFS_SB_LEBS + UBIFS_MST_LEBS + c->log_lebs; | |
420 | min_leb_cnt += c->lpt_lebs + c->orph_lebs + c->jhead_cnt + 6; | |
421 | ||
422 | if (c->leb_cnt < min_leb_cnt || c->leb_cnt > c->vi.size) { | |
235c362b | 423 | ubifs_err(c, "bad LEB count: %d in superblock, %d on UBI volume, %d minimum required", |
79fda517 | 424 | c->leb_cnt, c->vi.size, min_leb_cnt); |
1e51764a AB |
425 | goto failed; |
426 | } | |
427 | ||
428 | if (c->max_leb_cnt < c->leb_cnt) { | |
235c362b | 429 | ubifs_err(c, "max. LEB count %d less than LEB count %d", |
1e51764a AB |
430 | c->max_leb_cnt, c->leb_cnt); |
431 | goto failed; | |
432 | } | |
433 | ||
434 | if (c->main_lebs < UBIFS_MIN_MAIN_LEBS) { | |
235c362b | 435 | ubifs_err(c, "too few main LEBs count %d, must be at least %d", |
5a1f36c9 | 436 | c->main_lebs, UBIFS_MIN_MAIN_LEBS); |
1e51764a AB |
437 | goto failed; |
438 | } | |
439 | ||
5a1f36c9 AB |
440 | max_bytes = (long long)c->leb_size * UBIFS_MIN_BUD_LEBS; |
441 | if (c->max_bud_bytes < max_bytes) { | |
235c362b | 442 | ubifs_err(c, "too small journal (%lld bytes), must be at least %lld bytes", |
79fda517 | 443 | c->max_bud_bytes, max_bytes); |
5a1f36c9 AB |
444 | goto failed; |
445 | } | |
446 | ||
447 | max_bytes = (long long)c->leb_size * c->main_lebs; | |
448 | if (c->max_bud_bytes > max_bytes) { | |
235c362b | 449 | ubifs_err(c, "too large journal size (%lld bytes), only %lld bytes available in the main area", |
5a1f36c9 | 450 | c->max_bud_bytes, max_bytes); |
1e51764a AB |
451 | goto failed; |
452 | } | |
453 | ||
454 | if (c->jhead_cnt < NONDATA_JHEADS_CNT + 1 || | |
455 | c->jhead_cnt > NONDATA_JHEADS_CNT + UBIFS_MAX_JHEADS) { | |
456 | err = 9; | |
457 | goto failed; | |
458 | } | |
459 | ||
460 | if (c->fanout < UBIFS_MIN_FANOUT || | |
461 | ubifs_idx_node_sz(c, c->fanout) > c->leb_size) { | |
462 | err = 10; | |
463 | goto failed; | |
464 | } | |
465 | ||
466 | if (c->lsave_cnt < 0 || (c->lsave_cnt > DEFAULT_LSAVE_CNT && | |
467 | c->lsave_cnt > c->max_leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS - | |
468 | c->log_lebs - c->lpt_lebs - c->orph_lebs)) { | |
469 | err = 11; | |
470 | goto failed; | |
471 | } | |
472 | ||
473 | if (UBIFS_SB_LEBS + UBIFS_MST_LEBS + c->log_lebs + c->lpt_lebs + | |
474 | c->orph_lebs + c->main_lebs != c->leb_cnt) { | |
475 | err = 12; | |
476 | goto failed; | |
477 | } | |
478 | ||
b793a8c8 | 479 | if (c->default_compr >= UBIFS_COMPR_TYPES_CNT) { |
1e51764a AB |
480 | err = 13; |
481 | goto failed; | |
482 | } | |
483 | ||
1e51764a AB |
484 | if (c->rp_size < 0 || max_bytes < c->rp_size) { |
485 | err = 14; | |
486 | goto failed; | |
487 | } | |
488 | ||
489 | if (le32_to_cpu(sup->time_gran) > 1000000000 || | |
490 | le32_to_cpu(sup->time_gran) < 1) { | |
491 | err = 15; | |
492 | goto failed; | |
493 | } | |
494 | ||
fc4b891b RW |
495 | if (!c->double_hash && c->fmt_version >= 5) { |
496 | err = 16; | |
497 | goto failed; | |
498 | } | |
499 | ||
500 | if (c->encrypted && c->fmt_version < 5) { | |
501 | err = 17; | |
502 | goto failed; | |
503 | } | |
504 | ||
1e51764a AB |
505 | return 0; |
506 | ||
507 | failed: | |
235c362b | 508 | ubifs_err(c, "bad superblock, error %d", err); |
a33e30a0 | 509 | ubifs_dump_node(c, sup, ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size)); |
1e51764a AB |
510 | return -EINVAL; |
511 | } | |
512 | ||
513 | /** | |
514 | * ubifs_read_sb_node - read superblock node. | |
515 | * @c: UBIFS file-system description object | |
516 | * | |
517 | * This function returns a pointer to the superblock node or a negative error | |
eaeee242 AB |
518 | * code. Note, the user of this function is responsible of kfree()'ing the |
519 | * returned superblock buffer. | |
1e51764a | 520 | */ |
fd615005 | 521 | static struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c) |
1e51764a AB |
522 | { |
523 | struct ubifs_sb_node *sup; | |
524 | int err; | |
525 | ||
526 | sup = kmalloc(ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size), GFP_NOFS); | |
527 | if (!sup) | |
528 | return ERR_PTR(-ENOMEM); | |
529 | ||
530 | err = ubifs_read_node(c, sup, UBIFS_SB_NODE, UBIFS_SB_NODE_SZ, | |
531 | UBIFS_SB_LNUM, 0); | |
532 | if (err) { | |
533 | kfree(sup); | |
534 | return ERR_PTR(err); | |
535 | } | |
536 | ||
537 | return sup; | |
538 | } | |
539 | ||
e158e02f SH |
540 | static int authenticate_sb_node(struct ubifs_info *c, |
541 | const struct ubifs_sb_node *sup) | |
542 | { | |
543 | unsigned int sup_flags = le32_to_cpu(sup->flags); | |
544 | u8 hmac_wkm[UBIFS_HMAC_ARR_SZ]; | |
545 | int authenticated = !!(sup_flags & UBIFS_FLG_AUTHENTICATION); | |
546 | int hash_algo; | |
547 | int err; | |
548 | ||
549 | if (c->authenticated && !authenticated) { | |
550 | ubifs_err(c, "authenticated FS forced, but found FS without authentication"); | |
551 | return -EINVAL; | |
552 | } | |
553 | ||
554 | if (!c->authenticated && authenticated) { | |
555 | ubifs_err(c, "authenticated FS found, but no key given"); | |
556 | return -EINVAL; | |
557 | } | |
558 | ||
559 | ubifs_msg(c, "Mounting in %sauthenticated mode", | |
560 | c->authenticated ? "" : "un"); | |
561 | ||
562 | if (!c->authenticated) | |
563 | return 0; | |
564 | ||
565 | if (!IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION)) | |
566 | return -EOPNOTSUPP; | |
567 | ||
568 | hash_algo = le16_to_cpu(sup->hash_algo); | |
569 | if (hash_algo >= HASH_ALGO__LAST) { | |
570 | ubifs_err(c, "superblock uses unknown hash algo %d", | |
571 | hash_algo); | |
572 | return -EINVAL; | |
573 | } | |
574 | ||
575 | if (strcmp(hash_algo_name[hash_algo], c->auth_hash_name)) { | |
576 | ubifs_err(c, "This filesystem uses %s for hashing," | |
577 | " but %s is specified", hash_algo_name[hash_algo], | |
578 | c->auth_hash_name); | |
579 | return -EINVAL; | |
580 | } | |
581 | ||
817aa094 SH |
582 | /* |
583 | * The super block node can either be authenticated by a HMAC or | |
584 | * by a signature in a ubifs_sig_node directly following the | |
585 | * super block node to support offline image creation. | |
586 | */ | |
587 | if (ubifs_hmac_zero(c, sup->hmac)) { | |
588 | err = ubifs_sb_verify_signature(c, sup); | |
589 | } else { | |
590 | err = ubifs_hmac_wkm(c, hmac_wkm); | |
591 | if (err) | |
592 | return err; | |
593 | if (ubifs_check_hmac(c, hmac_wkm, sup->hmac_wkm)) { | |
594 | ubifs_err(c, "provided key does not fit"); | |
595 | return -ENOKEY; | |
596 | } | |
597 | err = ubifs_node_verify_hmac(c, sup, sizeof(*sup), | |
598 | offsetof(struct ubifs_sb_node, | |
599 | hmac)); | |
e158e02f SH |
600 | } |
601 | ||
e158e02f SH |
602 | if (err) |
603 | ubifs_err(c, "Failed to authenticate superblock: %d", err); | |
604 | ||
605 | return err; | |
606 | } | |
607 | ||
1e51764a AB |
608 | /** |
609 | * ubifs_write_sb_node - write superblock node. | |
610 | * @c: UBIFS file-system description object | |
611 | * @sup: superblock node read with 'ubifs_read_sb_node()' | |
612 | * | |
613 | * This function returns %0 on success and a negative error code on failure. | |
614 | */ | |
615 | int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup) | |
616 | { | |
617 | int len = ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size); | |
e158e02f SH |
618 | int err; |
619 | ||
620 | err = ubifs_prepare_node_hmac(c, sup, UBIFS_SB_NODE_SZ, | |
621 | offsetof(struct ubifs_sb_node, hmac), 1); | |
622 | if (err) | |
623 | return err; | |
1e51764a | 624 | |
b36a261e | 625 | return ubifs_leb_change(c, UBIFS_SB_LNUM, sup, len); |
1e51764a AB |
626 | } |
627 | ||
628 | /** | |
629 | * ubifs_read_superblock - read superblock. | |
630 | * @c: UBIFS file-system description object | |
631 | * | |
632 | * This function finds, reads and checks the superblock. If an empty UBI volume | |
633 | * is being mounted, this function creates default superblock. Returns zero in | |
634 | * case of success, and a negative error code in case of failure. | |
635 | */ | |
636 | int ubifs_read_superblock(struct ubifs_info *c) | |
637 | { | |
638 | int err, sup_flags; | |
639 | struct ubifs_sb_node *sup; | |
640 | ||
641 | if (c->empty) { | |
642 | err = create_default_filesystem(c); | |
643 | if (err) | |
644 | return err; | |
645 | } | |
646 | ||
647 | sup = ubifs_read_sb_node(c); | |
648 | if (IS_ERR(sup)) | |
649 | return PTR_ERR(sup); | |
650 | ||
fd615005 SH |
651 | c->sup_node = sup; |
652 | ||
963f0cf6 AB |
653 | c->fmt_version = le32_to_cpu(sup->fmt_version); |
654 | c->ro_compat_version = le32_to_cpu(sup->ro_compat_version); | |
655 | ||
1e51764a AB |
656 | /* |
657 | * The software supports all previous versions but not future versions, | |
658 | * due to the unavailability of time-travelling equipment. | |
659 | */ | |
1e51764a | 660 | if (c->fmt_version > UBIFS_FORMAT_VERSION) { |
6eb61d58 | 661 | ubifs_assert(c, !c->ro_media || c->ro_mount); |
2ef13294 | 662 | if (!c->ro_mount || |
963f0cf6 | 663 | c->ro_compat_version > UBIFS_RO_COMPAT_VERSION) { |
235c362b | 664 | ubifs_err(c, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d", |
79fda517 AB |
665 | c->fmt_version, c->ro_compat_version, |
666 | UBIFS_FORMAT_VERSION, | |
963f0cf6 AB |
667 | UBIFS_RO_COMPAT_VERSION); |
668 | if (c->ro_compat_version <= UBIFS_RO_COMPAT_VERSION) { | |
235c362b | 669 | ubifs_msg(c, "only R/O mounting is possible"); |
963f0cf6 AB |
670 | err = -EROFS; |
671 | } else | |
672 | err = -EINVAL; | |
673 | goto out; | |
674 | } | |
675 | ||
676 | /* | |
677 | * The FS is mounted R/O, and the media format is | |
678 | * R/O-compatible with the UBIFS implementation, so we can | |
679 | * mount. | |
680 | */ | |
681 | c->rw_incompat = 1; | |
1e51764a AB |
682 | } |
683 | ||
684 | if (c->fmt_version < 3) { | |
235c362b | 685 | ubifs_err(c, "on-flash format version %d is not supported", |
1e51764a AB |
686 | c->fmt_version); |
687 | err = -EINVAL; | |
688 | goto out; | |
689 | } | |
690 | ||
691 | switch (sup->key_hash) { | |
692 | case UBIFS_KEY_HASH_R5: | |
693 | c->key_hash = key_r5_hash; | |
694 | c->key_hash_type = UBIFS_KEY_HASH_R5; | |
695 | break; | |
696 | ||
697 | case UBIFS_KEY_HASH_TEST: | |
698 | c->key_hash = key_test_hash; | |
699 | c->key_hash_type = UBIFS_KEY_HASH_TEST; | |
700 | break; | |
84db119f | 701 | } |
1e51764a AB |
702 | |
703 | c->key_fmt = sup->key_fmt; | |
704 | ||
705 | switch (c->key_fmt) { | |
706 | case UBIFS_SIMPLE_KEY_FMT: | |
707 | c->key_len = UBIFS_SK_LEN; | |
708 | break; | |
709 | default: | |
235c362b | 710 | ubifs_err(c, "unsupported key format"); |
1e51764a AB |
711 | err = -EINVAL; |
712 | goto out; | |
713 | } | |
714 | ||
715 | c->leb_cnt = le32_to_cpu(sup->leb_cnt); | |
716 | c->max_leb_cnt = le32_to_cpu(sup->max_leb_cnt); | |
717 | c->max_bud_bytes = le64_to_cpu(sup->max_bud_bytes); | |
718 | c->log_lebs = le32_to_cpu(sup->log_lebs); | |
719 | c->lpt_lebs = le32_to_cpu(sup->lpt_lebs); | |
720 | c->orph_lebs = le32_to_cpu(sup->orph_lebs); | |
721 | c->jhead_cnt = le32_to_cpu(sup->jhead_cnt) + NONDATA_JHEADS_CNT; | |
722 | c->fanout = le32_to_cpu(sup->fanout); | |
723 | c->lsave_cnt = le32_to_cpu(sup->lsave_cnt); | |
1e51764a | 724 | c->rp_size = le64_to_cpu(sup->rp_size); |
39241beb EB |
725 | c->rp_uid = make_kuid(&init_user_ns, le32_to_cpu(sup->rp_uid)); |
726 | c->rp_gid = make_kgid(&init_user_ns, le32_to_cpu(sup->rp_gid)); | |
1e51764a | 727 | sup_flags = le32_to_cpu(sup->flags); |
553dea4d AB |
728 | if (!c->mount_opts.override_compr) |
729 | c->default_compr = le16_to_cpu(sup->default_compr); | |
1e51764a AB |
730 | |
731 | c->vfs_sb->s_time_gran = le32_to_cpu(sup->time_gran); | |
1e51764a | 732 | memcpy(&c->uuid, &sup->uuid, 16); |
1e51764a | 733 | c->big_lpt = !!(sup_flags & UBIFS_FLG_BIGLPT); |
9f58d350 | 734 | c->space_fixup = !!(sup_flags & UBIFS_FLG_SPACE_FIXUP); |
d63d61c1 | 735 | c->double_hash = !!(sup_flags & UBIFS_FLG_DOUBLE_HASH); |
e021986e RW |
736 | c->encrypted = !!(sup_flags & UBIFS_FLG_ENCRYPTION); |
737 | ||
e158e02f SH |
738 | err = authenticate_sb_node(c, sup); |
739 | if (err) | |
740 | goto out; | |
741 | ||
fc4b891b RW |
742 | if ((sup_flags & ~UBIFS_FLG_MASK) != 0) { |
743 | ubifs_err(c, "Unknown feature flags found: %#x", | |
744 | sup_flags & ~UBIFS_FLG_MASK); | |
745 | err = -EINVAL; | |
746 | goto out; | |
747 | } | |
748 | ||
76aa3494 | 749 | if (!IS_ENABLED(CONFIG_FS_ENCRYPTION) && c->encrypted) { |
e021986e RW |
750 | ubifs_err(c, "file system contains encrypted files but UBIFS" |
751 | " was built without crypto support."); | |
752 | err = -EINVAL; | |
753 | goto out; | |
754 | } | |
1e51764a AB |
755 | |
756 | /* Automatically increase file system size to the maximum size */ | |
1e51764a | 757 | if (c->leb_cnt < c->vi.size && c->leb_cnt < c->max_leb_cnt) { |
817aa094 SH |
758 | int old_leb_cnt = c->leb_cnt; |
759 | ||
1e51764a | 760 | c->leb_cnt = min_t(int, c->max_leb_cnt, c->vi.size); |
817aa094 SH |
761 | sup->leb_cnt = cpu_to_le32(c->leb_cnt); |
762 | ||
763 | c->superblock_need_write = 1; | |
764 | ||
765 | dbg_mnt("Auto resizing from %d LEBs to %d LEBs", | |
766 | old_leb_cnt, c->leb_cnt); | |
1e51764a AB |
767 | } |
768 | ||
769 | c->log_bytes = (long long)c->log_lebs * c->leb_size; | |
770 | c->log_last = UBIFS_LOG_LNUM + c->log_lebs - 1; | |
771 | c->lpt_first = UBIFS_LOG_LNUM + c->log_lebs; | |
772 | c->lpt_last = c->lpt_first + c->lpt_lebs - 1; | |
773 | c->orph_first = c->lpt_last + 1; | |
774 | c->orph_last = c->orph_first + c->orph_lebs - 1; | |
775 | c->main_lebs = c->leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS; | |
776 | c->main_lebs -= c->log_lebs + c->lpt_lebs + c->orph_lebs; | |
777 | c->main_first = c->leb_cnt - c->main_lebs; | |
1e51764a AB |
778 | |
779 | err = validate_sb(c, sup); | |
780 | out: | |
1e51764a AB |
781 | return err; |
782 | } | |
6554a657 MC |
783 | |
784 | /** | |
785 | * fixup_leb - fixup/unmap an LEB containing free space. | |
786 | * @c: UBIFS file-system description object | |
787 | * @lnum: the LEB number to fix up | |
788 | * @len: number of used bytes in LEB (starting at offset 0) | |
789 | * | |
790 | * This function reads the contents of the given LEB number @lnum, then fixes | |
791 | * it up, so that empty min. I/O units in the end of LEB are actually erased on | |
792 | * flash (rather than being just all-0xff real data). If the LEB is completely | |
793 | * empty, it is simply unmapped. | |
794 | */ | |
795 | static int fixup_leb(struct ubifs_info *c, int lnum, int len) | |
796 | { | |
797 | int err; | |
798 | ||
6eb61d58 RW |
799 | ubifs_assert(c, len >= 0); |
800 | ubifs_assert(c, len % c->min_io_size == 0); | |
801 | ubifs_assert(c, len < c->leb_size); | |
6554a657 MC |
802 | |
803 | if (len == 0) { | |
804 | dbg_mnt("unmap empty LEB %d", lnum); | |
d3b2578f | 805 | return ubifs_leb_unmap(c, lnum); |
6554a657 MC |
806 | } |
807 | ||
808 | dbg_mnt("fixup LEB %d, data len %d", lnum, len); | |
d304820a | 809 | err = ubifs_leb_read(c, lnum, c->sbuf, 0, len, 1); |
6554a657 MC |
810 | if (err) |
811 | return err; | |
812 | ||
b36a261e | 813 | return ubifs_leb_change(c, lnum, c->sbuf, len); |
6554a657 MC |
814 | } |
815 | ||
816 | /** | |
817 | * fixup_free_space - find & remap all LEBs containing free space. | |
818 | * @c: UBIFS file-system description object | |
819 | * | |
820 | * This function walks through all LEBs in the filesystem and fiexes up those | |
821 | * containing free/empty space. | |
822 | */ | |
823 | static int fixup_free_space(struct ubifs_info *c) | |
824 | { | |
825 | int lnum, err = 0; | |
826 | struct ubifs_lprops *lprops; | |
827 | ||
828 | ubifs_get_lprops(c); | |
829 | ||
830 | /* Fixup LEBs in the master area */ | |
831 | for (lnum = UBIFS_MST_LNUM; lnum < UBIFS_LOG_LNUM; lnum++) { | |
832 | err = fixup_leb(c, lnum, c->mst_offs + c->mst_node_alsz); | |
833 | if (err) | |
834 | goto out; | |
835 | } | |
836 | ||
837 | /* Unmap unused log LEBs */ | |
838 | lnum = ubifs_next_log_lnum(c, c->lhead_lnum); | |
839 | while (lnum != c->ltail_lnum) { | |
840 | err = fixup_leb(c, lnum, 0); | |
841 | if (err) | |
842 | goto out; | |
843 | lnum = ubifs_next_log_lnum(c, lnum); | |
844 | } | |
845 | ||
c6727932 AB |
846 | /* |
847 | * Fixup the log head which contains the only a CS node at the | |
848 | * beginning. | |
849 | */ | |
850 | err = fixup_leb(c, c->lhead_lnum, | |
851 | ALIGN(UBIFS_CS_NODE_SZ, c->min_io_size)); | |
6554a657 MC |
852 | if (err) |
853 | goto out; | |
854 | ||
855 | /* Fixup LEBs in the LPT area */ | |
856 | for (lnum = c->lpt_first; lnum <= c->lpt_last; lnum++) { | |
857 | int free = c->ltab[lnum - c->lpt_first].free; | |
858 | ||
859 | if (free > 0) { | |
860 | err = fixup_leb(c, lnum, c->leb_size - free); | |
861 | if (err) | |
862 | goto out; | |
863 | } | |
864 | } | |
865 | ||
866 | /* Unmap LEBs in the orphans area */ | |
867 | for (lnum = c->orph_first; lnum <= c->orph_last; lnum++) { | |
868 | err = fixup_leb(c, lnum, 0); | |
869 | if (err) | |
870 | goto out; | |
871 | } | |
872 | ||
873 | /* Fixup LEBs in the main area */ | |
874 | for (lnum = c->main_first; lnum < c->leb_cnt; lnum++) { | |
875 | lprops = ubifs_lpt_lookup(c, lnum); | |
876 | if (IS_ERR(lprops)) { | |
877 | err = PTR_ERR(lprops); | |
878 | goto out; | |
879 | } | |
880 | ||
881 | if (lprops->free > 0) { | |
882 | err = fixup_leb(c, lnum, c->leb_size - lprops->free); | |
883 | if (err) | |
884 | goto out; | |
885 | } | |
886 | } | |
887 | ||
888 | out: | |
889 | ubifs_release_lprops(c); | |
890 | return err; | |
891 | } | |
892 | ||
893 | /** | |
894 | * ubifs_fixup_free_space - find & fix all LEBs with free space. | |
895 | * @c: UBIFS file-system description object | |
896 | * | |
897 | * This function fixes up LEBs containing free space on first mount, if the | |
898 | * appropriate flag was set when the FS was created. Each LEB with one or more | |
899 | * empty min. I/O unit (i.e. free-space-count > 0) is re-written, to make sure | |
900 | * the free space is actually erased. E.g., this is necessary for some NAND | |
901 | * chips, since the free space may have been programmed like real "0xff" data | |
902 | * (generating a non-0xff ECC), causing future writes to the not-really-erased | |
903 | * NAND pages to behave badly. After the space is fixed up, the superblock flag | |
904 | * is cleared, so that this is skipped for all future mounts. | |
905 | */ | |
906 | int ubifs_fixup_free_space(struct ubifs_info *c) | |
907 | { | |
908 | int err; | |
fd615005 | 909 | struct ubifs_sb_node *sup = c->sup_node; |
6554a657 | 910 | |
6eb61d58 RW |
911 | ubifs_assert(c, c->space_fixup); |
912 | ubifs_assert(c, !c->ro_mount); | |
6554a657 | 913 | |
235c362b | 914 | ubifs_msg(c, "start fixing up free space"); |
6554a657 MC |
915 | |
916 | err = fixup_free_space(c); | |
917 | if (err) | |
918 | return err; | |
919 | ||
6554a657 MC |
920 | /* Free-space fixup is no longer required */ |
921 | c->space_fixup = 0; | |
922 | sup->flags &= cpu_to_le32(~UBIFS_FLG_SPACE_FIXUP); | |
923 | ||
817aa094 | 924 | c->superblock_need_write = 1; |
6554a657 | 925 | |
235c362b | 926 | ubifs_msg(c, "free space fixup complete"); |
6554a657 MC |
927 | return err; |
928 | } | |
e021986e RW |
929 | |
930 | int ubifs_enable_encryption(struct ubifs_info *c) | |
931 | { | |
932 | int err; | |
fd615005 | 933 | struct ubifs_sb_node *sup = c->sup_node; |
e021986e | 934 | |
76aa3494 | 935 | if (!IS_ENABLED(CONFIG_FS_ENCRYPTION)) |
eea2c05d SH |
936 | return -EOPNOTSUPP; |
937 | ||
e021986e RW |
938 | if (c->encrypted) |
939 | return 0; | |
940 | ||
941 | if (c->ro_mount || c->ro_media) | |
942 | return -EROFS; | |
943 | ||
944 | if (c->fmt_version < 5) { | |
945 | ubifs_err(c, "on-flash format version 5 is needed for encryption"); | |
946 | return -EINVAL; | |
947 | } | |
948 | ||
e021986e RW |
949 | sup->flags |= cpu_to_le32(UBIFS_FLG_ENCRYPTION); |
950 | ||
951 | err = ubifs_write_sb_node(c, sup); | |
952 | if (!err) | |
953 | c->encrypted = 1; | |
e021986e RW |
954 | |
955 | return err; | |
956 | } |