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719c1e18 NJ |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. | |
4 | */ | |
5 | ||
6 | #include <linux/fs_context.h> | |
7 | #include <linux/fs_parser.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/time.h> | |
11 | #include <linux/mount.h> | |
12 | #include <linux/cred.h> | |
13 | #include <linux/statfs.h> | |
14 | #include <linux/seq_file.h> | |
15 | #include <linux/blkdev.h> | |
16 | #include <linux/fs_struct.h> | |
17 | #include <linux/iversion.h> | |
18 | #include <linux/nls.h> | |
19 | #include <linux/buffer_head.h> | |
20 | ||
21 | #include "exfat_raw.h" | |
22 | #include "exfat_fs.h" | |
23 | ||
24 | static char exfat_default_iocharset[] = CONFIG_EXFAT_DEFAULT_IOCHARSET; | |
25 | static struct kmem_cache *exfat_inode_cachep; | |
26 | ||
27 | static void exfat_free_iocharset(struct exfat_sb_info *sbi) | |
28 | { | |
29 | if (sbi->options.iocharset != exfat_default_iocharset) | |
30 | kfree(sbi->options.iocharset); | |
31 | } | |
32 | ||
33 | static void exfat_delayed_free(struct rcu_head *p) | |
34 | { | |
35 | struct exfat_sb_info *sbi = container_of(p, struct exfat_sb_info, rcu); | |
36 | ||
37 | unload_nls(sbi->nls_io); | |
38 | exfat_free_iocharset(sbi); | |
39 | exfat_free_upcase_table(sbi); | |
40 | kfree(sbi); | |
41 | } | |
42 | ||
43 | static void exfat_put_super(struct super_block *sb) | |
44 | { | |
45 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
46 | ||
47 | mutex_lock(&sbi->s_lock); | |
719c1e18 | 48 | exfat_free_bitmap(sbi); |
181a9e80 | 49 | brelse(sbi->boot_bh); |
719c1e18 NJ |
50 | mutex_unlock(&sbi->s_lock); |
51 | ||
52 | call_rcu(&sbi->rcu, exfat_delayed_free); | |
53 | } | |
54 | ||
55 | static int exfat_sync_fs(struct super_block *sb, int wait) | |
56 | { | |
57 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
58 | int err = 0; | |
59 | ||
2c7f8937 TK |
60 | if (!wait) |
61 | return 0; | |
62 | ||
719c1e18 NJ |
63 | /* If there are some dirty buffers in the bdev inode */ |
64 | mutex_lock(&sbi->s_lock); | |
2c7f8937 | 65 | sync_blockdev(sb->s_bdev); |
7018ec68 | 66 | if (exfat_clear_volume_dirty(sb)) |
2c7f8937 | 67 | err = -EIO; |
719c1e18 NJ |
68 | mutex_unlock(&sbi->s_lock); |
69 | return err; | |
70 | } | |
71 | ||
72 | static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf) | |
73 | { | |
74 | struct super_block *sb = dentry->d_sb; | |
75 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
76 | unsigned long long id = huge_encode_dev(sb->s_bdev->bd_dev); | |
77 | ||
78 | if (sbi->used_clusters == EXFAT_CLUSTERS_UNTRACKED) { | |
79 | mutex_lock(&sbi->s_lock); | |
80 | if (exfat_count_used_clusters(sb, &sbi->used_clusters)) { | |
81 | mutex_unlock(&sbi->s_lock); | |
82 | return -EIO; | |
83 | } | |
84 | mutex_unlock(&sbi->s_lock); | |
85 | } | |
86 | ||
87 | buf->f_type = sb->s_magic; | |
88 | buf->f_bsize = sbi->cluster_size; | |
89 | buf->f_blocks = sbi->num_clusters - 2; /* clu 0 & 1 */ | |
90 | buf->f_bfree = buf->f_blocks - sbi->used_clusters; | |
91 | buf->f_bavail = buf->f_bfree; | |
6d1349c7 | 92 | buf->f_fsid = u64_to_fsid(id); |
719c1e18 NJ |
93 | /* Unicode utf16 255 characters */ |
94 | buf->f_namelen = EXFAT_MAX_FILE_LEN * NLS_MAX_CHARSET_SIZE; | |
95 | return 0; | |
96 | } | |
97 | ||
7018ec68 | 98 | static int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flags) |
719c1e18 NJ |
99 | { |
100 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
181a9e80 | 101 | struct boot_sector *p_boot = (struct boot_sector *)sbi->boot_bh->b_data; |
cdc06129 | 102 | bool sync; |
719c1e18 | 103 | |
7018ec68 TK |
104 | /* retain persistent-flags */ |
105 | new_flags |= sbi->vol_flags_persistent; | |
106 | ||
719c1e18 | 107 | /* flags are not changed */ |
7018ec68 | 108 | if (sbi->vol_flags == new_flags) |
719c1e18 NJ |
109 | return 0; |
110 | ||
7018ec68 | 111 | sbi->vol_flags = new_flags; |
719c1e18 NJ |
112 | |
113 | /* skip updating volume dirty flag, | |
114 | * if this volume has been mounted with read-only | |
115 | */ | |
116 | if (sb_rdonly(sb)) | |
117 | return 0; | |
118 | ||
7018ec68 | 119 | p_boot->vol_flags = cpu_to_le16(new_flags); |
719c1e18 | 120 | |
7018ec68 | 121 | if ((new_flags & VOLUME_DIRTY) && !buffer_dirty(sbi->boot_bh)) |
719c1e18 NJ |
122 | sync = true; |
123 | else | |
124 | sync = false; | |
125 | ||
181a9e80 TK |
126 | set_buffer_uptodate(sbi->boot_bh); |
127 | mark_buffer_dirty(sbi->boot_bh); | |
719c1e18 NJ |
128 | |
129 | if (sync) | |
181a9e80 | 130 | sync_dirty_buffer(sbi->boot_bh); |
719c1e18 NJ |
131 | return 0; |
132 | } | |
133 | ||
7018ec68 TK |
134 | int exfat_set_volume_dirty(struct super_block *sb) |
135 | { | |
136 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
137 | ||
138 | return exfat_set_vol_flags(sb, sbi->vol_flags | VOLUME_DIRTY); | |
139 | } | |
140 | ||
141 | int exfat_clear_volume_dirty(struct super_block *sb) | |
142 | { | |
143 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
144 | ||
145 | return exfat_set_vol_flags(sb, sbi->vol_flags & ~VOLUME_DIRTY); | |
146 | } | |
147 | ||
719c1e18 NJ |
148 | static int exfat_show_options(struct seq_file *m, struct dentry *root) |
149 | { | |
150 | struct super_block *sb = root->d_sb; | |
151 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
152 | struct exfat_mount_options *opts = &sbi->options; | |
153 | ||
154 | /* Show partition info */ | |
155 | if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID)) | |
156 | seq_printf(m, ",uid=%u", | |
157 | from_kuid_munged(&init_user_ns, opts->fs_uid)); | |
158 | if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID)) | |
159 | seq_printf(m, ",gid=%u", | |
160 | from_kgid_munged(&init_user_ns, opts->fs_gid)); | |
161 | seq_printf(m, ",fmask=%04o,dmask=%04o", opts->fs_fmask, opts->fs_dmask); | |
162 | if (opts->allow_utime) | |
163 | seq_printf(m, ",allow_utime=%04o", opts->allow_utime); | |
164 | if (opts->utf8) | |
165 | seq_puts(m, ",iocharset=utf8"); | |
166 | else if (sbi->nls_io) | |
167 | seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); | |
719c1e18 NJ |
168 | if (opts->errors == EXFAT_ERRORS_CONT) |
169 | seq_puts(m, ",errors=continue"); | |
170 | else if (opts->errors == EXFAT_ERRORS_PANIC) | |
171 | seq_puts(m, ",errors=panic"); | |
172 | else | |
173 | seq_puts(m, ",errors=remount-ro"); | |
174 | if (opts->discard) | |
175 | seq_puts(m, ",discard"); | |
176 | if (opts->time_offset) | |
177 | seq_printf(m, ",time_offset=%d", opts->time_offset); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static struct inode *exfat_alloc_inode(struct super_block *sb) | |
182 | { | |
183 | struct exfat_inode_info *ei; | |
184 | ||
185 | ei = kmem_cache_alloc(exfat_inode_cachep, GFP_NOFS); | |
186 | if (!ei) | |
187 | return NULL; | |
188 | ||
189 | init_rwsem(&ei->truncate_lock); | |
190 | return &ei->vfs_inode; | |
191 | } | |
192 | ||
193 | static void exfat_free_inode(struct inode *inode) | |
194 | { | |
195 | kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode)); | |
196 | } | |
197 | ||
198 | static const struct super_operations exfat_sops = { | |
199 | .alloc_inode = exfat_alloc_inode, | |
200 | .free_inode = exfat_free_inode, | |
201 | .write_inode = exfat_write_inode, | |
202 | .evict_inode = exfat_evict_inode, | |
203 | .put_super = exfat_put_super, | |
204 | .sync_fs = exfat_sync_fs, | |
205 | .statfs = exfat_statfs, | |
206 | .show_options = exfat_show_options, | |
207 | }; | |
208 | ||
209 | enum { | |
210 | Opt_uid, | |
211 | Opt_gid, | |
212 | Opt_umask, | |
213 | Opt_dmask, | |
214 | Opt_fmask, | |
215 | Opt_allow_utime, | |
216 | Opt_charset, | |
217 | Opt_errors, | |
218 | Opt_discard, | |
219 | Opt_time_offset, | |
907fa893 NJ |
220 | |
221 | /* Deprecated options */ | |
222 | Opt_utf8, | |
223 | Opt_debug, | |
224 | Opt_namecase, | |
225 | Opt_codepage, | |
719c1e18 NJ |
226 | }; |
227 | ||
9acd0d53 VK |
228 | static const struct constant_table exfat_param_enums[] = { |
229 | { "continue", EXFAT_ERRORS_CONT }, | |
230 | { "panic", EXFAT_ERRORS_PANIC }, | |
231 | { "remount-ro", EXFAT_ERRORS_RO }, | |
232 | {} | |
233 | }; | |
234 | ||
235 | static const struct fs_parameter_spec exfat_parameters[] = { | |
719c1e18 NJ |
236 | fsparam_u32("uid", Opt_uid), |
237 | fsparam_u32("gid", Opt_gid), | |
238 | fsparam_u32oct("umask", Opt_umask), | |
239 | fsparam_u32oct("dmask", Opt_dmask), | |
240 | fsparam_u32oct("fmask", Opt_fmask), | |
241 | fsparam_u32oct("allow_utime", Opt_allow_utime), | |
242 | fsparam_string("iocharset", Opt_charset), | |
9acd0d53 | 243 | fsparam_enum("errors", Opt_errors, exfat_param_enums), |
719c1e18 NJ |
244 | fsparam_flag("discard", Opt_discard), |
245 | fsparam_s32("time_offset", Opt_time_offset), | |
907fa893 NJ |
246 | __fsparam(NULL, "utf8", Opt_utf8, fs_param_deprecated, |
247 | NULL), | |
248 | __fsparam(NULL, "debug", Opt_debug, fs_param_deprecated, | |
249 | NULL), | |
250 | __fsparam(fs_param_is_u32, "namecase", Opt_namecase, | |
251 | fs_param_deprecated, NULL), | |
252 | __fsparam(fs_param_is_u32, "codepage", Opt_codepage, | |
253 | fs_param_deprecated, NULL), | |
719c1e18 NJ |
254 | {} |
255 | }; | |
256 | ||
719c1e18 NJ |
257 | static int exfat_parse_param(struct fs_context *fc, struct fs_parameter *param) |
258 | { | |
259 | struct exfat_sb_info *sbi = fc->s_fs_info; | |
260 | struct exfat_mount_options *opts = &sbi->options; | |
261 | struct fs_parse_result result; | |
262 | int opt; | |
263 | ||
9acd0d53 | 264 | opt = fs_parse(fc, exfat_parameters, param, &result); |
719c1e18 NJ |
265 | if (opt < 0) |
266 | return opt; | |
267 | ||
268 | switch (opt) { | |
269 | case Opt_uid: | |
270 | opts->fs_uid = make_kuid(current_user_ns(), result.uint_32); | |
271 | break; | |
272 | case Opt_gid: | |
273 | opts->fs_gid = make_kgid(current_user_ns(), result.uint_32); | |
274 | break; | |
275 | case Opt_umask: | |
276 | opts->fs_fmask = result.uint_32; | |
277 | opts->fs_dmask = result.uint_32; | |
278 | break; | |
279 | case Opt_dmask: | |
280 | opts->fs_dmask = result.uint_32; | |
281 | break; | |
282 | case Opt_fmask: | |
283 | opts->fs_fmask = result.uint_32; | |
284 | break; | |
285 | case Opt_allow_utime: | |
286 | opts->allow_utime = result.uint_32 & 0022; | |
287 | break; | |
288 | case Opt_charset: | |
289 | exfat_free_iocharset(sbi); | |
f341a7d8 AV |
290 | opts->iocharset = param->string; |
291 | param->string = NULL; | |
719c1e18 NJ |
292 | break; |
293 | case Opt_errors: | |
294 | opts->errors = result.uint_32; | |
295 | break; | |
296 | case Opt_discard: | |
297 | opts->discard = 1; | |
298 | break; | |
299 | case Opt_time_offset: | |
300 | /* | |
301 | * Make the limit 24 just in case someone invents something | |
302 | * unusual. | |
303 | */ | |
304 | if (result.int_32 < -24 * 60 || result.int_32 > 24 * 60) | |
305 | return -EINVAL; | |
306 | opts->time_offset = result.int_32; | |
307 | break; | |
907fa893 NJ |
308 | case Opt_utf8: |
309 | case Opt_debug: | |
310 | case Opt_namecase: | |
311 | case Opt_codepage: | |
312 | break; | |
719c1e18 NJ |
313 | default: |
314 | return -EINVAL; | |
315 | } | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | static void exfat_hash_init(struct super_block *sb) | |
321 | { | |
322 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
323 | int i; | |
324 | ||
325 | spin_lock_init(&sbi->inode_hash_lock); | |
326 | for (i = 0; i < EXFAT_HASH_SIZE; i++) | |
327 | INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); | |
328 | } | |
329 | ||
330 | static int exfat_read_root(struct inode *inode) | |
331 | { | |
332 | struct super_block *sb = inode->i_sb; | |
333 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
334 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
335 | struct exfat_chain cdir; | |
336 | int num_subdirs, num_clu = 0; | |
337 | ||
338 | exfat_chain_set(&ei->dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); | |
339 | ei->entry = -1; | |
340 | ei->start_clu = sbi->root_dir; | |
341 | ei->flags = ALLOC_FAT_CHAIN; | |
342 | ei->type = TYPE_DIR; | |
343 | ei->version = 0; | |
719c1e18 NJ |
344 | ei->hint_bmap.off = EXFAT_EOF_CLUSTER; |
345 | ei->hint_stat.eidx = 0; | |
346 | ei->hint_stat.clu = sbi->root_dir; | |
347 | ei->hint_femp.eidx = EXFAT_HINT_NONE; | |
348 | ||
349 | exfat_chain_set(&cdir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); | |
350 | if (exfat_count_num_clusters(sb, &cdir, &num_clu)) | |
351 | return -EIO; | |
352 | i_size_write(inode, num_clu << sbi->cluster_size_bits); | |
353 | ||
354 | num_subdirs = exfat_count_dir_entries(sb, &cdir); | |
355 | if (num_subdirs < 0) | |
356 | return -EIO; | |
357 | set_nlink(inode, num_subdirs + EXFAT_MIN_SUBDIR); | |
358 | ||
359 | inode->i_uid = sbi->options.fs_uid; | |
360 | inode->i_gid = sbi->options.fs_gid; | |
361 | inode_inc_iversion(inode); | |
362 | inode->i_generation = 0; | |
363 | inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, 0777); | |
364 | inode->i_op = &exfat_dir_inode_operations; | |
365 | inode->i_fop = &exfat_dir_operations; | |
366 | ||
367 | inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) | |
368 | & ~(sbi->cluster_size - 1)) >> inode->i_blkbits; | |
369 | EXFAT_I(inode)->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff; | |
370 | EXFAT_I(inode)->i_size_aligned = i_size_read(inode); | |
371 | EXFAT_I(inode)->i_size_ondisk = i_size_read(inode); | |
372 | ||
373 | exfat_save_attr(inode, ATTR_SUBDIR); | |
374 | inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = | |
375 | current_time(inode); | |
81df1ad4 | 376 | exfat_truncate_atime(&inode->i_atime); |
719c1e18 NJ |
377 | return 0; |
378 | } | |
379 | ||
33404a15 | 380 | static int exfat_calibrate_blocksize(struct super_block *sb, int logical_sect) |
719c1e18 | 381 | { |
b0516833 | 382 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
719c1e18 | 383 | |
575cb0e9 | 384 | if (!is_power_of_2(logical_sect)) { |
d1727d55 | 385 | exfat_err(sb, "bogus logical sector size %u", logical_sect); |
33404a15 | 386 | return -EIO; |
719c1e18 NJ |
387 | } |
388 | ||
389 | if (logical_sect < sb->s_blocksize) { | |
d1727d55 JP |
390 | exfat_err(sb, "logical sector size too small for device (logical sector size = %u)", |
391 | logical_sect); | |
33404a15 | 392 | return -EIO; |
719c1e18 NJ |
393 | } |
394 | ||
395 | if (logical_sect > sb->s_blocksize) { | |
181a9e80 TK |
396 | brelse(sbi->boot_bh); |
397 | sbi->boot_bh = NULL; | |
719c1e18 NJ |
398 | |
399 | if (!sb_set_blocksize(sb, logical_sect)) { | |
d1727d55 JP |
400 | exfat_err(sb, "unable to set blocksize %u", |
401 | logical_sect); | |
33404a15 | 402 | return -EIO; |
719c1e18 | 403 | } |
181a9e80 TK |
404 | sbi->boot_bh = sb_bread(sb, 0); |
405 | if (!sbi->boot_bh) { | |
d1727d55 JP |
406 | exfat_err(sb, "unable to read boot sector (logical sector size = %lu)", |
407 | sb->s_blocksize); | |
33404a15 | 408 | return -EIO; |
719c1e18 | 409 | } |
719c1e18 | 410 | } |
33404a15 | 411 | return 0; |
719c1e18 NJ |
412 | } |
413 | ||
33404a15 | 414 | static int exfat_read_boot_sector(struct super_block *sb) |
719c1e18 | 415 | { |
181a9e80 | 416 | struct boot_sector *p_boot; |
719c1e18 NJ |
417 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
418 | ||
419 | /* set block size to read super block */ | |
420 | sb_min_blocksize(sb, 512); | |
421 | ||
422 | /* read boot sector */ | |
181a9e80 TK |
423 | sbi->boot_bh = sb_bread(sb, 0); |
424 | if (!sbi->boot_bh) { | |
d1727d55 | 425 | exfat_err(sb, "unable to read boot sector"); |
719c1e18 NJ |
426 | return -EIO; |
427 | } | |
181a9e80 | 428 | p_boot = (struct boot_sector *)sbi->boot_bh->b_data; |
719c1e18 | 429 | |
181a9e80 TK |
430 | /* check the validity of BOOT */ |
431 | if (le16_to_cpu((p_boot->signature)) != BOOT_SIGNATURE) { | |
d1727d55 | 432 | exfat_err(sb, "invalid boot record signature"); |
33404a15 | 433 | return -EINVAL; |
719c1e18 NJ |
434 | } |
435 | ||
33404a15 TK |
436 | if (memcmp(p_boot->fs_name, STR_EXFAT, BOOTSEC_FS_NAME_LEN)) { |
437 | exfat_err(sb, "invalid fs_name"); /* fs_name may unprintable */ | |
438 | return -EINVAL; | |
719c1e18 NJ |
439 | } |
440 | ||
441 | /* | |
33404a15 | 442 | * must_be_zero field must be filled with zero to prevent mounting |
719c1e18 NJ |
443 | * from FAT volume. |
444 | */ | |
33404a15 TK |
445 | if (memchr_inv(p_boot->must_be_zero, 0, sizeof(p_boot->must_be_zero))) |
446 | return -EINVAL; | |
719c1e18 | 447 | |
33404a15 | 448 | if (p_boot->num_fats != 1 && p_boot->num_fats != 2) { |
d1727d55 | 449 | exfat_err(sb, "bogus number of FAT structure"); |
33404a15 | 450 | return -EINVAL; |
719c1e18 NJ |
451 | } |
452 | ||
575cb0e9 NJ |
453 | /* |
454 | * sect_size_bits could be at least 9 and at most 12. | |
455 | */ | |
456 | if (p_boot->sect_size_bits < EXFAT_MIN_SECT_SIZE_BITS || | |
457 | p_boot->sect_size_bits > EXFAT_MAX_SECT_SIZE_BITS) { | |
458 | exfat_err(sb, "bogus sector size bits : %u\n", | |
459 | p_boot->sect_size_bits); | |
460 | return -EINVAL; | |
461 | } | |
462 | ||
463 | /* | |
464 | * sect_per_clus_bits could be at least 0 and at most 25 - sect_size_bits. | |
465 | */ | |
466 | if (p_boot->sect_per_clus_bits > EXFAT_MAX_SECT_PER_CLUS_BITS(p_boot)) { | |
467 | exfat_err(sb, "bogus sectors bits per cluster : %u\n", | |
468 | p_boot->sect_per_clus_bits); | |
469 | return -EINVAL; | |
470 | } | |
471 | ||
181a9e80 TK |
472 | sbi->sect_per_clus = 1 << p_boot->sect_per_clus_bits; |
473 | sbi->sect_per_clus_bits = p_boot->sect_per_clus_bits; | |
33404a15 TK |
474 | sbi->cluster_size_bits = p_boot->sect_per_clus_bits + |
475 | p_boot->sect_size_bits; | |
719c1e18 | 476 | sbi->cluster_size = 1 << sbi->cluster_size_bits; |
181a9e80 TK |
477 | sbi->num_FAT_sectors = le32_to_cpu(p_boot->fat_length); |
478 | sbi->FAT1_start_sector = le32_to_cpu(p_boot->fat_offset); | |
33404a15 TK |
479 | sbi->FAT2_start_sector = le32_to_cpu(p_boot->fat_offset); |
480 | if (p_boot->num_fats == 2) | |
481 | sbi->FAT2_start_sector += sbi->num_FAT_sectors; | |
181a9e80 TK |
482 | sbi->data_start_sector = le32_to_cpu(p_boot->clu_offset); |
483 | sbi->num_sectors = le64_to_cpu(p_boot->vol_length); | |
719c1e18 | 484 | /* because the cluster index starts with 2 */ |
181a9e80 | 485 | sbi->num_clusters = le32_to_cpu(p_boot->clu_count) + |
719c1e18 NJ |
486 | EXFAT_RESERVED_CLUSTERS; |
487 | ||
181a9e80 | 488 | sbi->root_dir = le32_to_cpu(p_boot->root_cluster); |
719c1e18 NJ |
489 | sbi->dentries_per_clu = 1 << |
490 | (sbi->cluster_size_bits - DENTRY_SIZE_BITS); | |
491 | ||
7018ec68 TK |
492 | sbi->vol_flags = le16_to_cpu(p_boot->vol_flags); |
493 | sbi->vol_flags_persistent = sbi->vol_flags & (VOLUME_DIRTY | MEDIA_FAILURE); | |
719c1e18 NJ |
494 | sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER; |
495 | sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED; | |
496 | ||
33404a15 | 497 | /* check consistencies */ |
575cb0e9 NJ |
498 | if ((u64)sbi->num_FAT_sectors << p_boot->sect_size_bits < |
499 | (u64)sbi->num_clusters * 4) { | |
33404a15 TK |
500 | exfat_err(sb, "bogus fat length"); |
501 | return -EINVAL; | |
502 | } | |
575cb0e9 | 503 | |
33404a15 | 504 | if (sbi->data_start_sector < |
575cb0e9 NJ |
505 | (u64)sbi->FAT1_start_sector + |
506 | (u64)sbi->num_FAT_sectors * p_boot->num_fats) { | |
33404a15 TK |
507 | exfat_err(sb, "bogus data start sector"); |
508 | return -EINVAL; | |
719c1e18 | 509 | } |
575cb0e9 | 510 | |
7018ec68 | 511 | if (sbi->vol_flags & VOLUME_DIRTY) |
33404a15 | 512 | exfat_warn(sb, "Volume was not properly unmounted. Some data may be corrupt. Please run fsck."); |
7018ec68 | 513 | if (sbi->vol_flags & MEDIA_FAILURE) |
33404a15 | 514 | exfat_warn(sb, "Medium has reported failures. Some data may be lost."); |
719c1e18 NJ |
515 | |
516 | /* exFAT file size is limited by a disk volume size */ | |
517 | sb->s_maxbytes = (u64)(sbi->num_clusters - EXFAT_RESERVED_CLUSTERS) << | |
518 | sbi->cluster_size_bits; | |
519 | ||
33404a15 TK |
520 | /* check logical sector size */ |
521 | if (exfat_calibrate_blocksize(sb, 1 << p_boot->sect_size_bits)) | |
522 | return -EIO; | |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
476189c0 TK |
527 | static int exfat_verify_boot_region(struct super_block *sb) |
528 | { | |
529 | struct buffer_head *bh = NULL; | |
530 | u32 chksum = 0; | |
531 | __le32 *p_sig, *p_chksum; | |
532 | int sn, i; | |
533 | ||
534 | /* read boot sector sub-regions */ | |
535 | for (sn = 0; sn < 11; sn++) { | |
536 | bh = sb_bread(sb, sn); | |
537 | if (!bh) | |
538 | return -EIO; | |
539 | ||
540 | if (sn != 0 && sn <= 8) { | |
541 | /* extended boot sector sub-regions */ | |
542 | p_sig = (__le32 *)&bh->b_data[sb->s_blocksize - 4]; | |
543 | if (le32_to_cpu(*p_sig) != EXBOOT_SIGNATURE) | |
544 | exfat_warn(sb, "Invalid exboot-signature(sector = %d): 0x%08x", | |
545 | sn, le32_to_cpu(*p_sig)); | |
546 | } | |
547 | ||
548 | chksum = exfat_calc_chksum32(bh->b_data, sb->s_blocksize, | |
549 | chksum, sn ? CS_DEFAULT : CS_BOOT_SECTOR); | |
550 | brelse(bh); | |
551 | } | |
552 | ||
553 | /* boot checksum sub-regions */ | |
554 | bh = sb_bread(sb, sn); | |
555 | if (!bh) | |
556 | return -EIO; | |
557 | ||
558 | for (i = 0; i < sb->s_blocksize; i += sizeof(u32)) { | |
559 | p_chksum = (__le32 *)&bh->b_data[i]; | |
560 | if (le32_to_cpu(*p_chksum) != chksum) { | |
561 | exfat_err(sb, "Invalid boot checksum (boot checksum : 0x%08x, checksum : 0x%08x)", | |
562 | le32_to_cpu(*p_chksum), chksum); | |
563 | brelse(bh); | |
564 | return -EINVAL; | |
565 | } | |
566 | } | |
567 | brelse(bh); | |
568 | return 0; | |
569 | } | |
570 | ||
33404a15 TK |
571 | /* mount the file system volume */ |
572 | static int __exfat_fill_super(struct super_block *sb) | |
573 | { | |
574 | int ret; | |
575 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
576 | ||
577 | ret = exfat_read_boot_sector(sb); | |
578 | if (ret) { | |
579 | exfat_err(sb, "failed to read boot sector"); | |
580 | goto free_bh; | |
476189c0 TK |
581 | } |
582 | ||
583 | ret = exfat_verify_boot_region(sb); | |
584 | if (ret) { | |
585 | exfat_err(sb, "invalid boot region"); | |
586 | goto free_bh; | |
33404a15 TK |
587 | } |
588 | ||
719c1e18 NJ |
589 | ret = exfat_create_upcase_table(sb); |
590 | if (ret) { | |
d1727d55 | 591 | exfat_err(sb, "failed to load upcase table"); |
719c1e18 NJ |
592 | goto free_bh; |
593 | } | |
594 | ||
595 | ret = exfat_load_bitmap(sb); | |
596 | if (ret) { | |
d1727d55 | 597 | exfat_err(sb, "failed to load alloc-bitmap"); |
719c1e18 NJ |
598 | goto free_upcase_table; |
599 | } | |
600 | ||
601 | ret = exfat_count_used_clusters(sb, &sbi->used_clusters); | |
602 | if (ret) { | |
d1727d55 | 603 | exfat_err(sb, "failed to scan clusters"); |
719c1e18 NJ |
604 | goto free_alloc_bitmap; |
605 | } | |
606 | ||
607 | return 0; | |
608 | ||
609 | free_alloc_bitmap: | |
610 | exfat_free_bitmap(sbi); | |
611 | free_upcase_table: | |
612 | exfat_free_upcase_table(sbi); | |
613 | free_bh: | |
181a9e80 | 614 | brelse(sbi->boot_bh); |
719c1e18 NJ |
615 | return ret; |
616 | } | |
617 | ||
618 | static int exfat_fill_super(struct super_block *sb, struct fs_context *fc) | |
619 | { | |
620 | struct exfat_sb_info *sbi = sb->s_fs_info; | |
621 | struct exfat_mount_options *opts = &sbi->options; | |
622 | struct inode *root_inode; | |
623 | int err; | |
624 | ||
625 | if (opts->allow_utime == (unsigned short)-1) | |
626 | opts->allow_utime = ~opts->fs_dmask & 0022; | |
627 | ||
628 | if (opts->discard) { | |
629 | struct request_queue *q = bdev_get_queue(sb->s_bdev); | |
630 | ||
b7e038a9 | 631 | if (!blk_queue_discard(q)) { |
d1727d55 | 632 | exfat_warn(sb, "mounting with \"discard\" option, but the device does not support discard"); |
b7e038a9 PR |
633 | opts->discard = 0; |
634 | } | |
719c1e18 NJ |
635 | } |
636 | ||
637 | sb->s_flags |= SB_NODIRATIME; | |
638 | sb->s_magic = EXFAT_SUPER_MAGIC; | |
639 | sb->s_op = &exfat_sops; | |
640 | ||
674a9985 | 641 | sb->s_time_gran = 10 * NSEC_PER_MSEC; |
719c1e18 NJ |
642 | sb->s_time_min = EXFAT_MIN_TIMESTAMP_SECS; |
643 | sb->s_time_max = EXFAT_MAX_TIMESTAMP_SECS; | |
644 | ||
645 | err = __exfat_fill_super(sb); | |
646 | if (err) { | |
d1727d55 | 647 | exfat_err(sb, "failed to recognize exfat type"); |
719c1e18 NJ |
648 | goto check_nls_io; |
649 | } | |
650 | ||
651 | /* set up enough so that it can read an inode */ | |
652 | exfat_hash_init(sb); | |
653 | ||
654 | if (!strcmp(sbi->options.iocharset, "utf8")) | |
655 | opts->utf8 = 1; | |
656 | else { | |
657 | sbi->nls_io = load_nls(sbi->options.iocharset); | |
658 | if (!sbi->nls_io) { | |
d1727d55 JP |
659 | exfat_err(sb, "IO charset %s not found", |
660 | sbi->options.iocharset); | |
719c1e18 NJ |
661 | err = -EINVAL; |
662 | goto free_table; | |
663 | } | |
664 | } | |
665 | ||
666 | if (sbi->options.utf8) | |
667 | sb->s_d_op = &exfat_utf8_dentry_ops; | |
668 | else | |
669 | sb->s_d_op = &exfat_dentry_ops; | |
670 | ||
671 | root_inode = new_inode(sb); | |
672 | if (!root_inode) { | |
d1727d55 | 673 | exfat_err(sb, "failed to allocate root inode"); |
719c1e18 NJ |
674 | err = -ENOMEM; |
675 | goto free_table; | |
676 | } | |
677 | ||
678 | root_inode->i_ino = EXFAT_ROOT_INO; | |
679 | inode_set_iversion(root_inode, 1); | |
680 | err = exfat_read_root(root_inode); | |
681 | if (err) { | |
d1727d55 | 682 | exfat_err(sb, "failed to initialize root inode"); |
719c1e18 NJ |
683 | goto put_inode; |
684 | } | |
685 | ||
686 | exfat_hash_inode(root_inode, EXFAT_I(root_inode)->i_pos); | |
687 | insert_inode_hash(root_inode); | |
688 | ||
689 | sb->s_root = d_make_root(root_inode); | |
690 | if (!sb->s_root) { | |
d1727d55 | 691 | exfat_err(sb, "failed to get the root dentry"); |
719c1e18 NJ |
692 | err = -ENOMEM; |
693 | goto put_inode; | |
694 | } | |
695 | ||
696 | return 0; | |
697 | ||
698 | put_inode: | |
699 | iput(root_inode); | |
700 | sb->s_root = NULL; | |
701 | ||
702 | free_table: | |
703 | exfat_free_upcase_table(sbi); | |
704 | exfat_free_bitmap(sbi); | |
181a9e80 | 705 | brelse(sbi->boot_bh); |
719c1e18 NJ |
706 | |
707 | check_nls_io: | |
708 | unload_nls(sbi->nls_io); | |
709 | exfat_free_iocharset(sbi); | |
710 | sb->s_fs_info = NULL; | |
711 | kfree(sbi); | |
712 | return err; | |
713 | } | |
714 | ||
715 | static int exfat_get_tree(struct fs_context *fc) | |
716 | { | |
717 | return get_tree_bdev(fc, exfat_fill_super); | |
718 | } | |
719 | ||
720 | static void exfat_free(struct fs_context *fc) | |
721 | { | |
f341a7d8 AV |
722 | struct exfat_sb_info *sbi = fc->s_fs_info; |
723 | ||
724 | if (sbi) { | |
725 | exfat_free_iocharset(sbi); | |
726 | kfree(sbi); | |
727 | } | |
719c1e18 NJ |
728 | } |
729 | ||
a0271a15 HL |
730 | static int exfat_reconfigure(struct fs_context *fc) |
731 | { | |
732 | fc->sb_flags |= SB_NODIRATIME; | |
733 | ||
734 | /* volume flag will be updated in exfat_sync_fs */ | |
735 | sync_filesystem(fc->root->d_sb); | |
736 | return 0; | |
737 | } | |
738 | ||
719c1e18 NJ |
739 | static const struct fs_context_operations exfat_context_ops = { |
740 | .parse_param = exfat_parse_param, | |
741 | .get_tree = exfat_get_tree, | |
742 | .free = exfat_free, | |
a0271a15 | 743 | .reconfigure = exfat_reconfigure, |
719c1e18 NJ |
744 | }; |
745 | ||
746 | static int exfat_init_fs_context(struct fs_context *fc) | |
747 | { | |
748 | struct exfat_sb_info *sbi; | |
749 | ||
750 | sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL); | |
751 | if (!sbi) | |
752 | return -ENOMEM; | |
753 | ||
754 | mutex_init(&sbi->s_lock); | |
755 | ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, | |
756 | DEFAULT_RATELIMIT_BURST); | |
757 | ||
758 | sbi->options.fs_uid = current_uid(); | |
759 | sbi->options.fs_gid = current_gid(); | |
760 | sbi->options.fs_fmask = current->fs->umask; | |
761 | sbi->options.fs_dmask = current->fs->umask; | |
762 | sbi->options.allow_utime = -1; | |
763 | sbi->options.iocharset = exfat_default_iocharset; | |
764 | sbi->options.errors = EXFAT_ERRORS_RO; | |
765 | ||
766 | fc->s_fs_info = sbi; | |
767 | fc->ops = &exfat_context_ops; | |
768 | return 0; | |
769 | } | |
770 | ||
771 | static struct file_system_type exfat_fs_type = { | |
772 | .owner = THIS_MODULE, | |
773 | .name = "exfat", | |
774 | .init_fs_context = exfat_init_fs_context, | |
9acd0d53 | 775 | .parameters = exfat_parameters, |
719c1e18 NJ |
776 | .kill_sb = kill_block_super, |
777 | .fs_flags = FS_REQUIRES_DEV, | |
778 | }; | |
779 | ||
780 | static void exfat_inode_init_once(void *foo) | |
781 | { | |
782 | struct exfat_inode_info *ei = (struct exfat_inode_info *)foo; | |
783 | ||
8ff006e5 NJ |
784 | spin_lock_init(&ei->cache_lru_lock); |
785 | ei->nr_caches = 0; | |
786 | ei->cache_valid_id = EXFAT_CACHE_VALID + 1; | |
787 | INIT_LIST_HEAD(&ei->cache_lru); | |
719c1e18 NJ |
788 | INIT_HLIST_NODE(&ei->i_hash_fat); |
789 | inode_init_once(&ei->vfs_inode); | |
790 | } | |
791 | ||
792 | static int __init init_exfat_fs(void) | |
793 | { | |
794 | int err; | |
795 | ||
796 | err = exfat_cache_init(); | |
797 | if (err) | |
798 | return err; | |
799 | ||
800 | exfat_inode_cachep = kmem_cache_create("exfat_inode_cache", | |
801 | sizeof(struct exfat_inode_info), | |
802 | 0, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, | |
803 | exfat_inode_init_once); | |
804 | if (!exfat_inode_cachep) { | |
805 | err = -ENOMEM; | |
806 | goto shutdown_cache; | |
807 | } | |
808 | ||
809 | err = register_filesystem(&exfat_fs_type); | |
810 | if (err) | |
811 | goto destroy_cache; | |
812 | ||
813 | return 0; | |
814 | ||
815 | destroy_cache: | |
816 | kmem_cache_destroy(exfat_inode_cachep); | |
817 | shutdown_cache: | |
818 | exfat_cache_shutdown(); | |
819 | return err; | |
820 | } | |
821 | ||
822 | static void __exit exit_exfat_fs(void) | |
823 | { | |
824 | /* | |
825 | * Make sure all delayed rcu free inodes are flushed before we | |
826 | * destroy cache. | |
827 | */ | |
828 | rcu_barrier(); | |
829 | kmem_cache_destroy(exfat_inode_cachep); | |
830 | unregister_filesystem(&exfat_fs_type); | |
831 | exfat_cache_shutdown(); | |
832 | } | |
833 | ||
834 | module_init(init_exfat_fs); | |
835 | module_exit(exit_exfat_fs); | |
836 | ||
cd76ac25 | 837 | MODULE_ALIAS_FS("exfat"); |
719c1e18 NJ |
838 | MODULE_LICENSE("GPL"); |
839 | MODULE_DESCRIPTION("exFAT filesystem support"); | |
840 | MODULE_AUTHOR("Samsung Electronics Co., Ltd."); |