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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> | |
1ed147e2 | 20 | #include <linux/magic.h> |
719c1e18 NJ |
21 | |
22 | #include "exfat_raw.h" | |
23 | #include "exfat_fs.h" | |
24 | ||
25 | static char exfat_default_iocharset[] = CONFIG_EXFAT_DEFAULT_IOCHARSET; | |
26 | static struct kmem_cache *exfat_inode_cachep; | |
27 | ||
28 | static void exfat_free_iocharset(struct exfat_sb_info *sbi) | |
29 | { | |
30 | if (sbi->options.iocharset != exfat_default_iocharset) | |
31 | kfree(sbi->options.iocharset); | |
32 | } | |
33 | ||
719c1e18 NJ |
34 | static void exfat_put_super(struct super_block *sb) |
35 | { | |
36 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
37 | ||
38 | mutex_lock(&sbi->s_lock); | |
719c1e18 | 39 | exfat_free_bitmap(sbi); |
181a9e80 | 40 | brelse(sbi->boot_bh); |
719c1e18 | 41 | mutex_unlock(&sbi->s_lock); |
719c1e18 NJ |
42 | } |
43 | ||
44 | static int exfat_sync_fs(struct super_block *sb, int wait) | |
45 | { | |
46 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
47 | int err = 0; | |
48 | ||
2c7f8937 TK |
49 | if (!wait) |
50 | return 0; | |
51 | ||
719c1e18 NJ |
52 | /* If there are some dirty buffers in the bdev inode */ |
53 | mutex_lock(&sbi->s_lock); | |
2c7f8937 | 54 | sync_blockdev(sb->s_bdev); |
7018ec68 | 55 | if (exfat_clear_volume_dirty(sb)) |
2c7f8937 | 56 | err = -EIO; |
719c1e18 NJ |
57 | mutex_unlock(&sbi->s_lock); |
58 | return err; | |
59 | } | |
60 | ||
61 | static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf) | |
62 | { | |
63 | struct super_block *sb = dentry->d_sb; | |
64 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
65 | unsigned long long id = huge_encode_dev(sb->s_bdev->bd_dev); | |
66 | ||
67 | if (sbi->used_clusters == EXFAT_CLUSTERS_UNTRACKED) { | |
68 | mutex_lock(&sbi->s_lock); | |
69 | if (exfat_count_used_clusters(sb, &sbi->used_clusters)) { | |
70 | mutex_unlock(&sbi->s_lock); | |
71 | return -EIO; | |
72 | } | |
73 | mutex_unlock(&sbi->s_lock); | |
74 | } | |
75 | ||
76 | buf->f_type = sb->s_magic; | |
77 | buf->f_bsize = sbi->cluster_size; | |
78 | buf->f_blocks = sbi->num_clusters - 2; /* clu 0 & 1 */ | |
79 | buf->f_bfree = buf->f_blocks - sbi->used_clusters; | |
80 | buf->f_bavail = buf->f_bfree; | |
6d1349c7 | 81 | buf->f_fsid = u64_to_fsid(id); |
719c1e18 NJ |
82 | /* Unicode utf16 255 characters */ |
83 | buf->f_namelen = EXFAT_MAX_FILE_LEN * NLS_MAX_CHARSET_SIZE; | |
84 | return 0; | |
85 | } | |
86 | ||
7018ec68 | 87 | static int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flags) |
719c1e18 NJ |
88 | { |
89 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
181a9e80 | 90 | struct boot_sector *p_boot = (struct boot_sector *)sbi->boot_bh->b_data; |
719c1e18 | 91 | |
7018ec68 TK |
92 | /* retain persistent-flags */ |
93 | new_flags |= sbi->vol_flags_persistent; | |
94 | ||
719c1e18 | 95 | /* flags are not changed */ |
7018ec68 | 96 | if (sbi->vol_flags == new_flags) |
719c1e18 NJ |
97 | return 0; |
98 | ||
7018ec68 | 99 | sbi->vol_flags = new_flags; |
719c1e18 NJ |
100 | |
101 | /* skip updating volume dirty flag, | |
102 | * if this volume has been mounted with read-only | |
103 | */ | |
104 | if (sb_rdonly(sb)) | |
105 | return 0; | |
106 | ||
7018ec68 | 107 | p_boot->vol_flags = cpu_to_le16(new_flags); |
719c1e18 | 108 | |
181a9e80 TK |
109 | set_buffer_uptodate(sbi->boot_bh); |
110 | mark_buffer_dirty(sbi->boot_bh); | |
719c1e18 | 111 | |
a4a3d8c5 YM |
112 | __sync_dirty_buffer(sbi->boot_bh, REQ_SYNC | REQ_FUA | REQ_PREFLUSH); |
113 | ||
719c1e18 NJ |
114 | return 0; |
115 | } | |
116 | ||
7018ec68 TK |
117 | int exfat_set_volume_dirty(struct super_block *sb) |
118 | { | |
119 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
120 | ||
121 | return exfat_set_vol_flags(sb, sbi->vol_flags | VOLUME_DIRTY); | |
122 | } | |
123 | ||
124 | int exfat_clear_volume_dirty(struct super_block *sb) | |
125 | { | |
126 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
127 | ||
128 | return exfat_set_vol_flags(sb, sbi->vol_flags & ~VOLUME_DIRTY); | |
129 | } | |
130 | ||
719c1e18 NJ |
131 | static int exfat_show_options(struct seq_file *m, struct dentry *root) |
132 | { | |
133 | struct super_block *sb = root->d_sb; | |
134 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
135 | struct exfat_mount_options *opts = &sbi->options; | |
136 | ||
137 | /* Show partition info */ | |
138 | if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID)) | |
139 | seq_printf(m, ",uid=%u", | |
140 | from_kuid_munged(&init_user_ns, opts->fs_uid)); | |
141 | if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID)) | |
142 | seq_printf(m, ",gid=%u", | |
143 | from_kgid_munged(&init_user_ns, opts->fs_gid)); | |
144 | seq_printf(m, ",fmask=%04o,dmask=%04o", opts->fs_fmask, opts->fs_dmask); | |
145 | if (opts->allow_utime) | |
146 | seq_printf(m, ",allow_utime=%04o", opts->allow_utime); | |
147 | if (opts->utf8) | |
148 | seq_puts(m, ",iocharset=utf8"); | |
149 | else if (sbi->nls_io) | |
150 | seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); | |
719c1e18 NJ |
151 | if (opts->errors == EXFAT_ERRORS_CONT) |
152 | seq_puts(m, ",errors=continue"); | |
153 | else if (opts->errors == EXFAT_ERRORS_PANIC) | |
154 | seq_puts(m, ",errors=panic"); | |
155 | else | |
156 | seq_puts(m, ",errors=remount-ro"); | |
157 | if (opts->discard) | |
158 | seq_puts(m, ",discard"); | |
9ec784bf VK |
159 | if (opts->keep_last_dots) |
160 | seq_puts(m, ",keep_last_dots"); | |
9b002894 CCC |
161 | if (opts->sys_tz) |
162 | seq_puts(m, ",sys_tz"); | |
163 | else if (opts->time_offset) | |
719c1e18 | 164 | seq_printf(m, ",time_offset=%d", opts->time_offset); |
ee785c15 YM |
165 | if (opts->zero_size_dir) |
166 | seq_puts(m, ",zero_size_dir"); | |
719c1e18 NJ |
167 | return 0; |
168 | } | |
169 | ||
170 | static struct inode *exfat_alloc_inode(struct super_block *sb) | |
171 | { | |
172 | struct exfat_inode_info *ei; | |
173 | ||
fd60b288 | 174 | ei = alloc_inode_sb(sb, exfat_inode_cachep, GFP_NOFS); |
719c1e18 NJ |
175 | if (!ei) |
176 | return NULL; | |
177 | ||
178 | init_rwsem(&ei->truncate_lock); | |
179 | return &ei->vfs_inode; | |
180 | } | |
181 | ||
182 | static void exfat_free_inode(struct inode *inode) | |
183 | { | |
184 | kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode)); | |
185 | } | |
186 | ||
187 | static const struct super_operations exfat_sops = { | |
188 | .alloc_inode = exfat_alloc_inode, | |
189 | .free_inode = exfat_free_inode, | |
190 | .write_inode = exfat_write_inode, | |
191 | .evict_inode = exfat_evict_inode, | |
192 | .put_super = exfat_put_super, | |
193 | .sync_fs = exfat_sync_fs, | |
194 | .statfs = exfat_statfs, | |
195 | .show_options = exfat_show_options, | |
196 | }; | |
197 | ||
198 | enum { | |
199 | Opt_uid, | |
200 | Opt_gid, | |
201 | Opt_umask, | |
202 | Opt_dmask, | |
203 | Opt_fmask, | |
204 | Opt_allow_utime, | |
205 | Opt_charset, | |
206 | Opt_errors, | |
207 | Opt_discard, | |
9ec784bf | 208 | Opt_keep_last_dots, |
9b002894 | 209 | Opt_sys_tz, |
719c1e18 | 210 | Opt_time_offset, |
ee785c15 | 211 | Opt_zero_size_dir, |
907fa893 NJ |
212 | |
213 | /* Deprecated options */ | |
214 | Opt_utf8, | |
215 | Opt_debug, | |
216 | Opt_namecase, | |
217 | Opt_codepage, | |
719c1e18 NJ |
218 | }; |
219 | ||
9acd0d53 VK |
220 | static const struct constant_table exfat_param_enums[] = { |
221 | { "continue", EXFAT_ERRORS_CONT }, | |
222 | { "panic", EXFAT_ERRORS_PANIC }, | |
223 | { "remount-ro", EXFAT_ERRORS_RO }, | |
224 | {} | |
225 | }; | |
226 | ||
227 | static const struct fs_parameter_spec exfat_parameters[] = { | |
719c1e18 NJ |
228 | fsparam_u32("uid", Opt_uid), |
229 | fsparam_u32("gid", Opt_gid), | |
230 | fsparam_u32oct("umask", Opt_umask), | |
231 | fsparam_u32oct("dmask", Opt_dmask), | |
232 | fsparam_u32oct("fmask", Opt_fmask), | |
233 | fsparam_u32oct("allow_utime", Opt_allow_utime), | |
234 | fsparam_string("iocharset", Opt_charset), | |
9acd0d53 | 235 | fsparam_enum("errors", Opt_errors, exfat_param_enums), |
719c1e18 | 236 | fsparam_flag("discard", Opt_discard), |
9ec784bf | 237 | fsparam_flag("keep_last_dots", Opt_keep_last_dots), |
9b002894 | 238 | fsparam_flag("sys_tz", Opt_sys_tz), |
719c1e18 | 239 | fsparam_s32("time_offset", Opt_time_offset), |
ee785c15 | 240 | fsparam_flag("zero_size_dir", Opt_zero_size_dir), |
907fa893 NJ |
241 | __fsparam(NULL, "utf8", Opt_utf8, fs_param_deprecated, |
242 | NULL), | |
243 | __fsparam(NULL, "debug", Opt_debug, fs_param_deprecated, | |
244 | NULL), | |
245 | __fsparam(fs_param_is_u32, "namecase", Opt_namecase, | |
246 | fs_param_deprecated, NULL), | |
247 | __fsparam(fs_param_is_u32, "codepage", Opt_codepage, | |
248 | fs_param_deprecated, NULL), | |
719c1e18 NJ |
249 | {} |
250 | }; | |
251 | ||
719c1e18 NJ |
252 | static int exfat_parse_param(struct fs_context *fc, struct fs_parameter *param) |
253 | { | |
254 | struct exfat_sb_info *sbi = fc->s_fs_info; | |
255 | struct exfat_mount_options *opts = &sbi->options; | |
256 | struct fs_parse_result result; | |
257 | int opt; | |
258 | ||
9acd0d53 | 259 | opt = fs_parse(fc, exfat_parameters, param, &result); |
719c1e18 NJ |
260 | if (opt < 0) |
261 | return opt; | |
262 | ||
263 | switch (opt) { | |
264 | case Opt_uid: | |
265 | opts->fs_uid = make_kuid(current_user_ns(), result.uint_32); | |
266 | break; | |
267 | case Opt_gid: | |
268 | opts->fs_gid = make_kgid(current_user_ns(), result.uint_32); | |
269 | break; | |
270 | case Opt_umask: | |
271 | opts->fs_fmask = result.uint_32; | |
272 | opts->fs_dmask = result.uint_32; | |
273 | break; | |
274 | case Opt_dmask: | |
275 | opts->fs_dmask = result.uint_32; | |
276 | break; | |
277 | case Opt_fmask: | |
278 | opts->fs_fmask = result.uint_32; | |
279 | break; | |
280 | case Opt_allow_utime: | |
281 | opts->allow_utime = result.uint_32 & 0022; | |
282 | break; | |
283 | case Opt_charset: | |
284 | exfat_free_iocharset(sbi); | |
f341a7d8 AV |
285 | opts->iocharset = param->string; |
286 | param->string = NULL; | |
719c1e18 NJ |
287 | break; |
288 | case Opt_errors: | |
289 | opts->errors = result.uint_32; | |
290 | break; | |
291 | case Opt_discard: | |
292 | opts->discard = 1; | |
293 | break; | |
9ec784bf VK |
294 | case Opt_keep_last_dots: |
295 | opts->keep_last_dots = 1; | |
296 | break; | |
9b002894 CCC |
297 | case Opt_sys_tz: |
298 | opts->sys_tz = 1; | |
299 | break; | |
719c1e18 NJ |
300 | case Opt_time_offset: |
301 | /* | |
302 | * Make the limit 24 just in case someone invents something | |
303 | * unusual. | |
304 | */ | |
305 | if (result.int_32 < -24 * 60 || result.int_32 > 24 * 60) | |
306 | return -EINVAL; | |
307 | opts->time_offset = result.int_32; | |
308 | break; | |
ee785c15 YM |
309 | case Opt_zero_size_dir: |
310 | opts->zero_size_dir = true; | |
311 | break; | |
907fa893 NJ |
312 | case Opt_utf8: |
313 | case Opt_debug: | |
314 | case Opt_namecase: | |
315 | case Opt_codepage: | |
316 | break; | |
719c1e18 NJ |
317 | default: |
318 | return -EINVAL; | |
319 | } | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | static void exfat_hash_init(struct super_block *sb) | |
325 | { | |
326 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
327 | int i; | |
328 | ||
329 | spin_lock_init(&sbi->inode_hash_lock); | |
330 | for (i = 0; i < EXFAT_HASH_SIZE; i++) | |
331 | INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); | |
332 | } | |
333 | ||
334 | static int exfat_read_root(struct inode *inode) | |
335 | { | |
336 | struct super_block *sb = inode->i_sb; | |
337 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
338 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
339 | struct exfat_chain cdir; | |
340 | int num_subdirs, num_clu = 0; | |
341 | ||
342 | exfat_chain_set(&ei->dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); | |
343 | ei->entry = -1; | |
344 | ei->start_clu = sbi->root_dir; | |
345 | ei->flags = ALLOC_FAT_CHAIN; | |
346 | ei->type = TYPE_DIR; | |
347 | ei->version = 0; | |
719c1e18 NJ |
348 | ei->hint_bmap.off = EXFAT_EOF_CLUSTER; |
349 | ei->hint_stat.eidx = 0; | |
350 | ei->hint_stat.clu = sbi->root_dir; | |
351 | ei->hint_femp.eidx = EXFAT_HINT_NONE; | |
352 | ||
353 | exfat_chain_set(&cdir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); | |
354 | if (exfat_count_num_clusters(sb, &cdir, &num_clu)) | |
355 | return -EIO; | |
356 | i_size_write(inode, num_clu << sbi->cluster_size_bits); | |
357 | ||
358 | num_subdirs = exfat_count_dir_entries(sb, &cdir); | |
359 | if (num_subdirs < 0) | |
360 | return -EIO; | |
361 | set_nlink(inode, num_subdirs + EXFAT_MIN_SUBDIR); | |
362 | ||
363 | inode->i_uid = sbi->options.fs_uid; | |
364 | inode->i_gid = sbi->options.fs_gid; | |
365 | inode_inc_iversion(inode); | |
366 | inode->i_generation = 0; | |
0ab8ba71 | 367 | inode->i_mode = exfat_make_mode(sbi, EXFAT_ATTR_SUBDIR, 0777); |
719c1e18 NJ |
368 | inode->i_op = &exfat_dir_inode_operations; |
369 | inode->i_fop = &exfat_dir_operations; | |
370 | ||
39c1ce8e | 371 | inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9; |
7dee6f57 CVB |
372 | ei->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff; |
373 | ei->i_size_aligned = i_size_read(inode); | |
374 | ei->i_size_ondisk = i_size_read(inode); | |
719c1e18 | 375 | |
0ab8ba71 | 376 | exfat_save_attr(inode, EXFAT_ATTR_SUBDIR); |
4c72a36e JL |
377 | ei->i_crtime = simple_inode_init_ts(inode); |
378 | exfat_truncate_inode_atime(inode); | |
719c1e18 NJ |
379 | return 0; |
380 | } | |
381 | ||
33404a15 | 382 | static int exfat_calibrate_blocksize(struct super_block *sb, int logical_sect) |
719c1e18 | 383 | { |
b0516833 | 384 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
719c1e18 | 385 | |
78c276f5 | 386 | if (!is_power_of_2(logical_sect)) { |
d1727d55 | 387 | exfat_err(sb, "bogus logical sector size %u", logical_sect); |
33404a15 | 388 | return -EIO; |
719c1e18 NJ |
389 | } |
390 | ||
391 | if (logical_sect < sb->s_blocksize) { | |
d1727d55 JP |
392 | exfat_err(sb, "logical sector size too small for device (logical sector size = %u)", |
393 | logical_sect); | |
33404a15 | 394 | return -EIO; |
719c1e18 NJ |
395 | } |
396 | ||
397 | if (logical_sect > sb->s_blocksize) { | |
181a9e80 TK |
398 | brelse(sbi->boot_bh); |
399 | sbi->boot_bh = NULL; | |
719c1e18 NJ |
400 | |
401 | if (!sb_set_blocksize(sb, logical_sect)) { | |
d1727d55 JP |
402 | exfat_err(sb, "unable to set blocksize %u", |
403 | logical_sect); | |
33404a15 | 404 | return -EIO; |
719c1e18 | 405 | } |
181a9e80 TK |
406 | sbi->boot_bh = sb_bread(sb, 0); |
407 | if (!sbi->boot_bh) { | |
d1727d55 JP |
408 | exfat_err(sb, "unable to read boot sector (logical sector size = %lu)", |
409 | sb->s_blocksize); | |
33404a15 | 410 | return -EIO; |
719c1e18 | 411 | } |
719c1e18 | 412 | } |
33404a15 | 413 | return 0; |
719c1e18 NJ |
414 | } |
415 | ||
33404a15 | 416 | static int exfat_read_boot_sector(struct super_block *sb) |
719c1e18 | 417 | { |
181a9e80 | 418 | struct boot_sector *p_boot; |
719c1e18 NJ |
419 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
420 | ||
421 | /* set block size to read super block */ | |
422 | sb_min_blocksize(sb, 512); | |
423 | ||
424 | /* read boot sector */ | |
181a9e80 TK |
425 | sbi->boot_bh = sb_bread(sb, 0); |
426 | if (!sbi->boot_bh) { | |
d1727d55 | 427 | exfat_err(sb, "unable to read boot sector"); |
719c1e18 NJ |
428 | return -EIO; |
429 | } | |
181a9e80 | 430 | p_boot = (struct boot_sector *)sbi->boot_bh->b_data; |
719c1e18 | 431 | |
181a9e80 TK |
432 | /* check the validity of BOOT */ |
433 | if (le16_to_cpu((p_boot->signature)) != BOOT_SIGNATURE) { | |
d1727d55 | 434 | exfat_err(sb, "invalid boot record signature"); |
33404a15 | 435 | return -EINVAL; |
719c1e18 NJ |
436 | } |
437 | ||
33404a15 TK |
438 | if (memcmp(p_boot->fs_name, STR_EXFAT, BOOTSEC_FS_NAME_LEN)) { |
439 | exfat_err(sb, "invalid fs_name"); /* fs_name may unprintable */ | |
440 | return -EINVAL; | |
719c1e18 NJ |
441 | } |
442 | ||
443 | /* | |
33404a15 | 444 | * must_be_zero field must be filled with zero to prevent mounting |
719c1e18 NJ |
445 | * from FAT volume. |
446 | */ | |
33404a15 TK |
447 | if (memchr_inv(p_boot->must_be_zero, 0, sizeof(p_boot->must_be_zero))) |
448 | return -EINVAL; | |
719c1e18 | 449 | |
33404a15 | 450 | if (p_boot->num_fats != 1 && p_boot->num_fats != 2) { |
d1727d55 | 451 | exfat_err(sb, "bogus number of FAT structure"); |
33404a15 | 452 | return -EINVAL; |
719c1e18 NJ |
453 | } |
454 | ||
78c276f5 NJ |
455 | /* |
456 | * sect_size_bits could be at least 9 and at most 12. | |
457 | */ | |
458 | if (p_boot->sect_size_bits < EXFAT_MIN_SECT_SIZE_BITS || | |
459 | p_boot->sect_size_bits > EXFAT_MAX_SECT_SIZE_BITS) { | |
512b74d1 | 460 | exfat_err(sb, "bogus sector size bits : %u", |
78c276f5 NJ |
461 | p_boot->sect_size_bits); |
462 | return -EINVAL; | |
463 | } | |
464 | ||
465 | /* | |
466 | * sect_per_clus_bits could be at least 0 and at most 25 - sect_size_bits. | |
467 | */ | |
468 | if (p_boot->sect_per_clus_bits > EXFAT_MAX_SECT_PER_CLUS_BITS(p_boot)) { | |
512b74d1 | 469 | exfat_err(sb, "bogus sectors bits per cluster : %u", |
78c276f5 NJ |
470 | p_boot->sect_per_clus_bits); |
471 | return -EINVAL; | |
472 | } | |
473 | ||
181a9e80 TK |
474 | sbi->sect_per_clus = 1 << p_boot->sect_per_clus_bits; |
475 | sbi->sect_per_clus_bits = p_boot->sect_per_clus_bits; | |
33404a15 TK |
476 | sbi->cluster_size_bits = p_boot->sect_per_clus_bits + |
477 | p_boot->sect_size_bits; | |
719c1e18 | 478 | sbi->cluster_size = 1 << sbi->cluster_size_bits; |
181a9e80 TK |
479 | sbi->num_FAT_sectors = le32_to_cpu(p_boot->fat_length); |
480 | sbi->FAT1_start_sector = le32_to_cpu(p_boot->fat_offset); | |
33404a15 TK |
481 | sbi->FAT2_start_sector = le32_to_cpu(p_boot->fat_offset); |
482 | if (p_boot->num_fats == 2) | |
483 | sbi->FAT2_start_sector += sbi->num_FAT_sectors; | |
181a9e80 TK |
484 | sbi->data_start_sector = le32_to_cpu(p_boot->clu_offset); |
485 | sbi->num_sectors = le64_to_cpu(p_boot->vol_length); | |
719c1e18 | 486 | /* because the cluster index starts with 2 */ |
181a9e80 | 487 | sbi->num_clusters = le32_to_cpu(p_boot->clu_count) + |
719c1e18 NJ |
488 | EXFAT_RESERVED_CLUSTERS; |
489 | ||
181a9e80 | 490 | sbi->root_dir = le32_to_cpu(p_boot->root_cluster); |
719c1e18 NJ |
491 | sbi->dentries_per_clu = 1 << |
492 | (sbi->cluster_size_bits - DENTRY_SIZE_BITS); | |
493 | ||
7018ec68 TK |
494 | sbi->vol_flags = le16_to_cpu(p_boot->vol_flags); |
495 | sbi->vol_flags_persistent = sbi->vol_flags & (VOLUME_DIRTY | MEDIA_FAILURE); | |
719c1e18 NJ |
496 | sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER; |
497 | sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED; | |
498 | ||
33404a15 | 499 | /* check consistencies */ |
78c276f5 NJ |
500 | if ((u64)sbi->num_FAT_sectors << p_boot->sect_size_bits < |
501 | (u64)sbi->num_clusters * 4) { | |
33404a15 TK |
502 | exfat_err(sb, "bogus fat length"); |
503 | return -EINVAL; | |
504 | } | |
78c276f5 | 505 | |
33404a15 | 506 | if (sbi->data_start_sector < |
78c276f5 NJ |
507 | (u64)sbi->FAT1_start_sector + |
508 | (u64)sbi->num_FAT_sectors * p_boot->num_fats) { | |
33404a15 TK |
509 | exfat_err(sb, "bogus data start sector"); |
510 | return -EINVAL; | |
719c1e18 | 511 | } |
78c276f5 | 512 | |
7018ec68 | 513 | if (sbi->vol_flags & VOLUME_DIRTY) |
33404a15 | 514 | exfat_warn(sb, "Volume was not properly unmounted. Some data may be corrupt. Please run fsck."); |
7018ec68 | 515 | if (sbi->vol_flags & MEDIA_FAILURE) |
33404a15 | 516 | exfat_warn(sb, "Medium has reported failures. Some data may be lost."); |
719c1e18 NJ |
517 | |
518 | /* exFAT file size is limited by a disk volume size */ | |
519 | sb->s_maxbytes = (u64)(sbi->num_clusters - EXFAT_RESERVED_CLUSTERS) << | |
520 | sbi->cluster_size_bits; | |
521 | ||
33404a15 TK |
522 | /* check logical sector size */ |
523 | if (exfat_calibrate_blocksize(sb, 1 << p_boot->sect_size_bits)) | |
524 | return -EIO; | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
476189c0 TK |
529 | static int exfat_verify_boot_region(struct super_block *sb) |
530 | { | |
531 | struct buffer_head *bh = NULL; | |
532 | u32 chksum = 0; | |
533 | __le32 *p_sig, *p_chksum; | |
534 | int sn, i; | |
535 | ||
536 | /* read boot sector sub-regions */ | |
537 | for (sn = 0; sn < 11; sn++) { | |
538 | bh = sb_bread(sb, sn); | |
539 | if (!bh) | |
540 | return -EIO; | |
541 | ||
542 | if (sn != 0 && sn <= 8) { | |
543 | /* extended boot sector sub-regions */ | |
544 | p_sig = (__le32 *)&bh->b_data[sb->s_blocksize - 4]; | |
545 | if (le32_to_cpu(*p_sig) != EXBOOT_SIGNATURE) | |
546 | exfat_warn(sb, "Invalid exboot-signature(sector = %d): 0x%08x", | |
547 | sn, le32_to_cpu(*p_sig)); | |
548 | } | |
549 | ||
550 | chksum = exfat_calc_chksum32(bh->b_data, sb->s_blocksize, | |
551 | chksum, sn ? CS_DEFAULT : CS_BOOT_SECTOR); | |
552 | brelse(bh); | |
553 | } | |
554 | ||
555 | /* boot checksum sub-regions */ | |
556 | bh = sb_bread(sb, sn); | |
557 | if (!bh) | |
558 | return -EIO; | |
559 | ||
560 | for (i = 0; i < sb->s_blocksize; i += sizeof(u32)) { | |
561 | p_chksum = (__le32 *)&bh->b_data[i]; | |
562 | if (le32_to_cpu(*p_chksum) != chksum) { | |
563 | exfat_err(sb, "Invalid boot checksum (boot checksum : 0x%08x, checksum : 0x%08x)", | |
564 | le32_to_cpu(*p_chksum), chksum); | |
565 | brelse(bh); | |
566 | return -EINVAL; | |
567 | } | |
568 | } | |
569 | brelse(bh); | |
570 | return 0; | |
571 | } | |
572 | ||
33404a15 TK |
573 | /* mount the file system volume */ |
574 | static int __exfat_fill_super(struct super_block *sb) | |
575 | { | |
576 | int ret; | |
577 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
578 | ||
579 | ret = exfat_read_boot_sector(sb); | |
580 | if (ret) { | |
581 | exfat_err(sb, "failed to read boot sector"); | |
582 | goto free_bh; | |
476189c0 TK |
583 | } |
584 | ||
585 | ret = exfat_verify_boot_region(sb); | |
586 | if (ret) { | |
587 | exfat_err(sb, "invalid boot region"); | |
588 | goto free_bh; | |
33404a15 TK |
589 | } |
590 | ||
719c1e18 NJ |
591 | ret = exfat_create_upcase_table(sb); |
592 | if (ret) { | |
d1727d55 | 593 | exfat_err(sb, "failed to load upcase table"); |
719c1e18 NJ |
594 | goto free_bh; |
595 | } | |
596 | ||
597 | ret = exfat_load_bitmap(sb); | |
598 | if (ret) { | |
d1727d55 | 599 | exfat_err(sb, "failed to load alloc-bitmap"); |
a13d1a4d | 600 | goto free_bh; |
719c1e18 NJ |
601 | } |
602 | ||
603 | ret = exfat_count_used_clusters(sb, &sbi->used_clusters); | |
604 | if (ret) { | |
d1727d55 | 605 | exfat_err(sb, "failed to scan clusters"); |
719c1e18 NJ |
606 | goto free_alloc_bitmap; |
607 | } | |
608 | ||
609 | return 0; | |
610 | ||
611 | free_alloc_bitmap: | |
612 | exfat_free_bitmap(sbi); | |
719c1e18 | 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 | ||
70200574 CH |
628 | if (opts->discard && !bdev_max_discard_sectors(sb->s_bdev)) { |
629 | exfat_warn(sb, "mounting with \"discard\" option, but the device does not support discard"); | |
630 | opts->discard = 0; | |
719c1e18 NJ |
631 | } |
632 | ||
633 | sb->s_flags |= SB_NODIRATIME; | |
634 | sb->s_magic = EXFAT_SUPER_MAGIC; | |
635 | sb->s_op = &exfat_sops; | |
636 | ||
674a9985 | 637 | sb->s_time_gran = 10 * NSEC_PER_MSEC; |
719c1e18 NJ |
638 | sb->s_time_min = EXFAT_MIN_TIMESTAMP_SECS; |
639 | sb->s_time_max = EXFAT_MAX_TIMESTAMP_SECS; | |
640 | ||
641 | err = __exfat_fill_super(sb); | |
642 | if (err) { | |
d1727d55 | 643 | exfat_err(sb, "failed to recognize exfat type"); |
719c1e18 NJ |
644 | goto check_nls_io; |
645 | } | |
646 | ||
647 | /* set up enough so that it can read an inode */ | |
648 | exfat_hash_init(sb); | |
649 | ||
650 | if (!strcmp(sbi->options.iocharset, "utf8")) | |
651 | opts->utf8 = 1; | |
652 | else { | |
653 | sbi->nls_io = load_nls(sbi->options.iocharset); | |
654 | if (!sbi->nls_io) { | |
d1727d55 JP |
655 | exfat_err(sb, "IO charset %s not found", |
656 | sbi->options.iocharset); | |
719c1e18 NJ |
657 | err = -EINVAL; |
658 | goto free_table; | |
659 | } | |
660 | } | |
661 | ||
662 | if (sbi->options.utf8) | |
663 | sb->s_d_op = &exfat_utf8_dentry_ops; | |
664 | else | |
665 | sb->s_d_op = &exfat_dentry_ops; | |
666 | ||
667 | root_inode = new_inode(sb); | |
668 | if (!root_inode) { | |
d1727d55 | 669 | exfat_err(sb, "failed to allocate root inode"); |
719c1e18 NJ |
670 | err = -ENOMEM; |
671 | goto free_table; | |
672 | } | |
673 | ||
674 | root_inode->i_ino = EXFAT_ROOT_INO; | |
675 | inode_set_iversion(root_inode, 1); | |
676 | err = exfat_read_root(root_inode); | |
677 | if (err) { | |
d1727d55 | 678 | exfat_err(sb, "failed to initialize root inode"); |
719c1e18 NJ |
679 | goto put_inode; |
680 | } | |
681 | ||
682 | exfat_hash_inode(root_inode, EXFAT_I(root_inode)->i_pos); | |
683 | insert_inode_hash(root_inode); | |
684 | ||
685 | sb->s_root = d_make_root(root_inode); | |
686 | if (!sb->s_root) { | |
d1727d55 | 687 | exfat_err(sb, "failed to get the root dentry"); |
719c1e18 | 688 | err = -ENOMEM; |
839a534f | 689 | goto free_table; |
719c1e18 NJ |
690 | } |
691 | ||
692 | return 0; | |
693 | ||
694 | put_inode: | |
695 | iput(root_inode); | |
696 | sb->s_root = NULL; | |
697 | ||
698 | free_table: | |
719c1e18 | 699 | exfat_free_bitmap(sbi); |
181a9e80 | 700 | brelse(sbi->boot_bh); |
719c1e18 NJ |
701 | |
702 | check_nls_io: | |
719c1e18 NJ |
703 | return err; |
704 | } | |
705 | ||
706 | static int exfat_get_tree(struct fs_context *fc) | |
707 | { | |
708 | return get_tree_bdev(fc, exfat_fill_super); | |
709 | } | |
710 | ||
4abc9a43 CH |
711 | static void exfat_free_sbi(struct exfat_sb_info *sbi) |
712 | { | |
713 | exfat_free_iocharset(sbi); | |
714 | kfree(sbi); | |
715 | } | |
716 | ||
719c1e18 NJ |
717 | static void exfat_free(struct fs_context *fc) |
718 | { | |
f341a7d8 AV |
719 | struct exfat_sb_info *sbi = fc->s_fs_info; |
720 | ||
4abc9a43 CH |
721 | if (sbi) |
722 | exfat_free_sbi(sbi); | |
719c1e18 NJ |
723 | } |
724 | ||
a0271a15 HL |
725 | static int exfat_reconfigure(struct fs_context *fc) |
726 | { | |
727 | fc->sb_flags |= SB_NODIRATIME; | |
728 | ||
729 | /* volume flag will be updated in exfat_sync_fs */ | |
730 | sync_filesystem(fc->root->d_sb); | |
731 | return 0; | |
732 | } | |
733 | ||
719c1e18 NJ |
734 | static const struct fs_context_operations exfat_context_ops = { |
735 | .parse_param = exfat_parse_param, | |
736 | .get_tree = exfat_get_tree, | |
737 | .free = exfat_free, | |
a0271a15 | 738 | .reconfigure = exfat_reconfigure, |
719c1e18 NJ |
739 | }; |
740 | ||
741 | static int exfat_init_fs_context(struct fs_context *fc) | |
742 | { | |
743 | struct exfat_sb_info *sbi; | |
744 | ||
745 | sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL); | |
746 | if (!sbi) | |
747 | return -ENOMEM; | |
748 | ||
749 | mutex_init(&sbi->s_lock); | |
5c2d7285 | 750 | mutex_init(&sbi->bitmap_lock); |
719c1e18 NJ |
751 | ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, |
752 | DEFAULT_RATELIMIT_BURST); | |
753 | ||
754 | sbi->options.fs_uid = current_uid(); | |
755 | sbi->options.fs_gid = current_gid(); | |
756 | sbi->options.fs_fmask = current->fs->umask; | |
757 | sbi->options.fs_dmask = current->fs->umask; | |
758 | sbi->options.allow_utime = -1; | |
759 | sbi->options.iocharset = exfat_default_iocharset; | |
760 | sbi->options.errors = EXFAT_ERRORS_RO; | |
761 | ||
762 | fc->s_fs_info = sbi; | |
763 | fc->ops = &exfat_context_ops; | |
764 | return 0; | |
765 | } | |
766 | ||
a13d1a4d AV |
767 | static void delayed_free(struct rcu_head *p) |
768 | { | |
769 | struct exfat_sb_info *sbi = container_of(p, struct exfat_sb_info, rcu); | |
770 | ||
771 | unload_nls(sbi->nls_io); | |
772 | exfat_free_upcase_table(sbi); | |
773 | exfat_free_sbi(sbi); | |
774 | } | |
775 | ||
4abc9a43 CH |
776 | static void exfat_kill_sb(struct super_block *sb) |
777 | { | |
778 | struct exfat_sb_info *sbi = sb->s_fs_info; | |
779 | ||
780 | kill_block_super(sb); | |
781 | if (sbi) | |
a13d1a4d | 782 | call_rcu(&sbi->rcu, delayed_free); |
4abc9a43 CH |
783 | } |
784 | ||
719c1e18 NJ |
785 | static struct file_system_type exfat_fs_type = { |
786 | .owner = THIS_MODULE, | |
787 | .name = "exfat", | |
788 | .init_fs_context = exfat_init_fs_context, | |
9acd0d53 | 789 | .parameters = exfat_parameters, |
4abc9a43 | 790 | .kill_sb = exfat_kill_sb, |
719c1e18 NJ |
791 | .fs_flags = FS_REQUIRES_DEV, |
792 | }; | |
793 | ||
794 | static void exfat_inode_init_once(void *foo) | |
795 | { | |
796 | struct exfat_inode_info *ei = (struct exfat_inode_info *)foo; | |
797 | ||
8ff006e5 NJ |
798 | spin_lock_init(&ei->cache_lru_lock); |
799 | ei->nr_caches = 0; | |
800 | ei->cache_valid_id = EXFAT_CACHE_VALID + 1; | |
801 | INIT_LIST_HEAD(&ei->cache_lru); | |
719c1e18 NJ |
802 | INIT_HLIST_NODE(&ei->i_hash_fat); |
803 | inode_init_once(&ei->vfs_inode); | |
804 | } | |
805 | ||
806 | static int __init init_exfat_fs(void) | |
807 | { | |
808 | int err; | |
809 | ||
810 | err = exfat_cache_init(); | |
811 | if (err) | |
812 | return err; | |
813 | ||
814 | exfat_inode_cachep = kmem_cache_create("exfat_inode_cache", | |
815 | sizeof(struct exfat_inode_info), | |
816 | 0, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, | |
817 | exfat_inode_init_once); | |
818 | if (!exfat_inode_cachep) { | |
819 | err = -ENOMEM; | |
820 | goto shutdown_cache; | |
821 | } | |
822 | ||
823 | err = register_filesystem(&exfat_fs_type); | |
824 | if (err) | |
825 | goto destroy_cache; | |
826 | ||
827 | return 0; | |
828 | ||
829 | destroy_cache: | |
830 | kmem_cache_destroy(exfat_inode_cachep); | |
831 | shutdown_cache: | |
832 | exfat_cache_shutdown(); | |
833 | return err; | |
834 | } | |
835 | ||
836 | static void __exit exit_exfat_fs(void) | |
837 | { | |
838 | /* | |
839 | * Make sure all delayed rcu free inodes are flushed before we | |
840 | * destroy cache. | |
841 | */ | |
842 | rcu_barrier(); | |
843 | kmem_cache_destroy(exfat_inode_cachep); | |
844 | unregister_filesystem(&exfat_fs_type); | |
845 | exfat_cache_shutdown(); | |
846 | } | |
847 | ||
848 | module_init(init_exfat_fs); | |
849 | module_exit(exit_exfat_fs); | |
850 | ||
cd76ac25 | 851 | MODULE_ALIAS_FS("exfat"); |
719c1e18 NJ |
852 | MODULE_LICENSE("GPL"); |
853 | MODULE_DESCRIPTION("exFAT filesystem support"); | |
854 | MODULE_AUTHOR("Samsung Electronics Co., Ltd."); |