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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 | ||
34 | static void exfat_delayed_free(struct rcu_head *p) | |
35 | { | |
36 | struct exfat_sb_info *sbi = container_of(p, struct exfat_sb_info, rcu); | |
37 | ||
38 | unload_nls(sbi->nls_io); | |
39 | exfat_free_iocharset(sbi); | |
40 | exfat_free_upcase_table(sbi); | |
41 | kfree(sbi); | |
42 | } | |
43 | ||
44 | static void exfat_put_super(struct super_block *sb) | |
45 | { | |
46 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
47 | ||
48 | mutex_lock(&sbi->s_lock); | |
719c1e18 | 49 | exfat_free_bitmap(sbi); |
181a9e80 | 50 | brelse(sbi->boot_bh); |
719c1e18 NJ |
51 | mutex_unlock(&sbi->s_lock); |
52 | ||
53 | call_rcu(&sbi->rcu, exfat_delayed_free); | |
54 | } | |
55 | ||
56 | static int exfat_sync_fs(struct super_block *sb, int wait) | |
57 | { | |
58 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
59 | int err = 0; | |
60 | ||
2c7f8937 TK |
61 | if (!wait) |
62 | return 0; | |
63 | ||
719c1e18 NJ |
64 | /* If there are some dirty buffers in the bdev inode */ |
65 | mutex_lock(&sbi->s_lock); | |
2c7f8937 | 66 | sync_blockdev(sb->s_bdev); |
7018ec68 | 67 | if (exfat_clear_volume_dirty(sb)) |
2c7f8937 | 68 | err = -EIO; |
719c1e18 NJ |
69 | mutex_unlock(&sbi->s_lock); |
70 | return err; | |
71 | } | |
72 | ||
73 | static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf) | |
74 | { | |
75 | struct super_block *sb = dentry->d_sb; | |
76 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
77 | unsigned long long id = huge_encode_dev(sb->s_bdev->bd_dev); | |
78 | ||
79 | if (sbi->used_clusters == EXFAT_CLUSTERS_UNTRACKED) { | |
80 | mutex_lock(&sbi->s_lock); | |
81 | if (exfat_count_used_clusters(sb, &sbi->used_clusters)) { | |
82 | mutex_unlock(&sbi->s_lock); | |
83 | return -EIO; | |
84 | } | |
85 | mutex_unlock(&sbi->s_lock); | |
86 | } | |
87 | ||
88 | buf->f_type = sb->s_magic; | |
89 | buf->f_bsize = sbi->cluster_size; | |
90 | buf->f_blocks = sbi->num_clusters - 2; /* clu 0 & 1 */ | |
91 | buf->f_bfree = buf->f_blocks - sbi->used_clusters; | |
92 | buf->f_bavail = buf->f_bfree; | |
6d1349c7 | 93 | buf->f_fsid = u64_to_fsid(id); |
719c1e18 NJ |
94 | /* Unicode utf16 255 characters */ |
95 | buf->f_namelen = EXFAT_MAX_FILE_LEN * NLS_MAX_CHARSET_SIZE; | |
96 | return 0; | |
97 | } | |
98 | ||
7018ec68 | 99 | static int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flags) |
719c1e18 NJ |
100 | { |
101 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
181a9e80 | 102 | struct boot_sector *p_boot = (struct boot_sector *)sbi->boot_bh->b_data; |
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 | |
181a9e80 TK |
121 | set_buffer_uptodate(sbi->boot_bh); |
122 | mark_buffer_dirty(sbi->boot_bh); | |
719c1e18 | 123 | |
a4a3d8c5 YM |
124 | __sync_dirty_buffer(sbi->boot_bh, REQ_SYNC | REQ_FUA | REQ_PREFLUSH); |
125 | ||
719c1e18 NJ |
126 | return 0; |
127 | } | |
128 | ||
7018ec68 TK |
129 | int exfat_set_volume_dirty(struct super_block *sb) |
130 | { | |
131 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
132 | ||
133 | return exfat_set_vol_flags(sb, sbi->vol_flags | VOLUME_DIRTY); | |
134 | } | |
135 | ||
136 | int exfat_clear_volume_dirty(struct super_block *sb) | |
137 | { | |
138 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
139 | ||
140 | return exfat_set_vol_flags(sb, sbi->vol_flags & ~VOLUME_DIRTY); | |
141 | } | |
142 | ||
719c1e18 NJ |
143 | static int exfat_show_options(struct seq_file *m, struct dentry *root) |
144 | { | |
145 | struct super_block *sb = root->d_sb; | |
146 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
147 | struct exfat_mount_options *opts = &sbi->options; | |
148 | ||
149 | /* Show partition info */ | |
150 | if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID)) | |
151 | seq_printf(m, ",uid=%u", | |
152 | from_kuid_munged(&init_user_ns, opts->fs_uid)); | |
153 | if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID)) | |
154 | seq_printf(m, ",gid=%u", | |
155 | from_kgid_munged(&init_user_ns, opts->fs_gid)); | |
156 | seq_printf(m, ",fmask=%04o,dmask=%04o", opts->fs_fmask, opts->fs_dmask); | |
157 | if (opts->allow_utime) | |
158 | seq_printf(m, ",allow_utime=%04o", opts->allow_utime); | |
159 | if (opts->utf8) | |
160 | seq_puts(m, ",iocharset=utf8"); | |
161 | else if (sbi->nls_io) | |
162 | seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); | |
719c1e18 NJ |
163 | if (opts->errors == EXFAT_ERRORS_CONT) |
164 | seq_puts(m, ",errors=continue"); | |
165 | else if (opts->errors == EXFAT_ERRORS_PANIC) | |
166 | seq_puts(m, ",errors=panic"); | |
167 | else | |
168 | seq_puts(m, ",errors=remount-ro"); | |
169 | if (opts->discard) | |
170 | seq_puts(m, ",discard"); | |
9ec784bf VK |
171 | if (opts->keep_last_dots) |
172 | seq_puts(m, ",keep_last_dots"); | |
9b002894 CCC |
173 | if (opts->sys_tz) |
174 | seq_puts(m, ",sys_tz"); | |
175 | else if (opts->time_offset) | |
719c1e18 NJ |
176 | seq_printf(m, ",time_offset=%d", opts->time_offset); |
177 | return 0; | |
178 | } | |
179 | ||
180 | static struct inode *exfat_alloc_inode(struct super_block *sb) | |
181 | { | |
182 | struct exfat_inode_info *ei; | |
183 | ||
fd60b288 | 184 | ei = alloc_inode_sb(sb, exfat_inode_cachep, GFP_NOFS); |
719c1e18 NJ |
185 | if (!ei) |
186 | return NULL; | |
187 | ||
188 | init_rwsem(&ei->truncate_lock); | |
189 | return &ei->vfs_inode; | |
190 | } | |
191 | ||
192 | static void exfat_free_inode(struct inode *inode) | |
193 | { | |
194 | kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode)); | |
195 | } | |
196 | ||
197 | static const struct super_operations exfat_sops = { | |
198 | .alloc_inode = exfat_alloc_inode, | |
199 | .free_inode = exfat_free_inode, | |
200 | .write_inode = exfat_write_inode, | |
201 | .evict_inode = exfat_evict_inode, | |
202 | .put_super = exfat_put_super, | |
203 | .sync_fs = exfat_sync_fs, | |
204 | .statfs = exfat_statfs, | |
205 | .show_options = exfat_show_options, | |
206 | }; | |
207 | ||
208 | enum { | |
209 | Opt_uid, | |
210 | Opt_gid, | |
211 | Opt_umask, | |
212 | Opt_dmask, | |
213 | Opt_fmask, | |
214 | Opt_allow_utime, | |
215 | Opt_charset, | |
216 | Opt_errors, | |
217 | Opt_discard, | |
9ec784bf | 218 | Opt_keep_last_dots, |
9b002894 | 219 | Opt_sys_tz, |
719c1e18 | 220 | Opt_time_offset, |
907fa893 NJ |
221 | |
222 | /* Deprecated options */ | |
223 | Opt_utf8, | |
224 | Opt_debug, | |
225 | Opt_namecase, | |
226 | Opt_codepage, | |
719c1e18 NJ |
227 | }; |
228 | ||
9acd0d53 VK |
229 | static const struct constant_table exfat_param_enums[] = { |
230 | { "continue", EXFAT_ERRORS_CONT }, | |
231 | { "panic", EXFAT_ERRORS_PANIC }, | |
232 | { "remount-ro", EXFAT_ERRORS_RO }, | |
233 | {} | |
234 | }; | |
235 | ||
236 | static const struct fs_parameter_spec exfat_parameters[] = { | |
719c1e18 NJ |
237 | fsparam_u32("uid", Opt_uid), |
238 | fsparam_u32("gid", Opt_gid), | |
239 | fsparam_u32oct("umask", Opt_umask), | |
240 | fsparam_u32oct("dmask", Opt_dmask), | |
241 | fsparam_u32oct("fmask", Opt_fmask), | |
242 | fsparam_u32oct("allow_utime", Opt_allow_utime), | |
243 | fsparam_string("iocharset", Opt_charset), | |
9acd0d53 | 244 | fsparam_enum("errors", Opt_errors, exfat_param_enums), |
719c1e18 | 245 | fsparam_flag("discard", Opt_discard), |
9ec784bf | 246 | fsparam_flag("keep_last_dots", Opt_keep_last_dots), |
9b002894 | 247 | fsparam_flag("sys_tz", Opt_sys_tz), |
719c1e18 | 248 | fsparam_s32("time_offset", Opt_time_offset), |
907fa893 NJ |
249 | __fsparam(NULL, "utf8", Opt_utf8, fs_param_deprecated, |
250 | NULL), | |
251 | __fsparam(NULL, "debug", Opt_debug, fs_param_deprecated, | |
252 | NULL), | |
253 | __fsparam(fs_param_is_u32, "namecase", Opt_namecase, | |
254 | fs_param_deprecated, NULL), | |
255 | __fsparam(fs_param_is_u32, "codepage", Opt_codepage, | |
256 | fs_param_deprecated, NULL), | |
719c1e18 NJ |
257 | {} |
258 | }; | |
259 | ||
719c1e18 NJ |
260 | static int exfat_parse_param(struct fs_context *fc, struct fs_parameter *param) |
261 | { | |
262 | struct exfat_sb_info *sbi = fc->s_fs_info; | |
263 | struct exfat_mount_options *opts = &sbi->options; | |
264 | struct fs_parse_result result; | |
265 | int opt; | |
266 | ||
9acd0d53 | 267 | opt = fs_parse(fc, exfat_parameters, param, &result); |
719c1e18 NJ |
268 | if (opt < 0) |
269 | return opt; | |
270 | ||
271 | switch (opt) { | |
272 | case Opt_uid: | |
273 | opts->fs_uid = make_kuid(current_user_ns(), result.uint_32); | |
274 | break; | |
275 | case Opt_gid: | |
276 | opts->fs_gid = make_kgid(current_user_ns(), result.uint_32); | |
277 | break; | |
278 | case Opt_umask: | |
279 | opts->fs_fmask = result.uint_32; | |
280 | opts->fs_dmask = result.uint_32; | |
281 | break; | |
282 | case Opt_dmask: | |
283 | opts->fs_dmask = result.uint_32; | |
284 | break; | |
285 | case Opt_fmask: | |
286 | opts->fs_fmask = result.uint_32; | |
287 | break; | |
288 | case Opt_allow_utime: | |
289 | opts->allow_utime = result.uint_32 & 0022; | |
290 | break; | |
291 | case Opt_charset: | |
292 | exfat_free_iocharset(sbi); | |
f341a7d8 AV |
293 | opts->iocharset = param->string; |
294 | param->string = NULL; | |
719c1e18 NJ |
295 | break; |
296 | case Opt_errors: | |
297 | opts->errors = result.uint_32; | |
298 | break; | |
299 | case Opt_discard: | |
300 | opts->discard = 1; | |
301 | break; | |
9ec784bf VK |
302 | case Opt_keep_last_dots: |
303 | opts->keep_last_dots = 1; | |
304 | break; | |
9b002894 CCC |
305 | case Opt_sys_tz: |
306 | opts->sys_tz = 1; | |
307 | break; | |
719c1e18 NJ |
308 | case Opt_time_offset: |
309 | /* | |
310 | * Make the limit 24 just in case someone invents something | |
311 | * unusual. | |
312 | */ | |
313 | if (result.int_32 < -24 * 60 || result.int_32 > 24 * 60) | |
314 | return -EINVAL; | |
315 | opts->time_offset = result.int_32; | |
316 | break; | |
907fa893 NJ |
317 | case Opt_utf8: |
318 | case Opt_debug: | |
319 | case Opt_namecase: | |
320 | case Opt_codepage: | |
321 | break; | |
719c1e18 NJ |
322 | default: |
323 | return -EINVAL; | |
324 | } | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | static void exfat_hash_init(struct super_block *sb) | |
330 | { | |
331 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
332 | int i; | |
333 | ||
334 | spin_lock_init(&sbi->inode_hash_lock); | |
335 | for (i = 0; i < EXFAT_HASH_SIZE; i++) | |
336 | INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); | |
337 | } | |
338 | ||
339 | static int exfat_read_root(struct inode *inode) | |
340 | { | |
341 | struct super_block *sb = inode->i_sb; | |
342 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
343 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
344 | struct exfat_chain cdir; | |
345 | int num_subdirs, num_clu = 0; | |
346 | ||
347 | exfat_chain_set(&ei->dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); | |
348 | ei->entry = -1; | |
349 | ei->start_clu = sbi->root_dir; | |
350 | ei->flags = ALLOC_FAT_CHAIN; | |
351 | ei->type = TYPE_DIR; | |
352 | ei->version = 0; | |
719c1e18 NJ |
353 | ei->hint_bmap.off = EXFAT_EOF_CLUSTER; |
354 | ei->hint_stat.eidx = 0; | |
355 | ei->hint_stat.clu = sbi->root_dir; | |
356 | ei->hint_femp.eidx = EXFAT_HINT_NONE; | |
357 | ||
358 | exfat_chain_set(&cdir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); | |
359 | if (exfat_count_num_clusters(sb, &cdir, &num_clu)) | |
360 | return -EIO; | |
361 | i_size_write(inode, num_clu << sbi->cluster_size_bits); | |
362 | ||
363 | num_subdirs = exfat_count_dir_entries(sb, &cdir); | |
364 | if (num_subdirs < 0) | |
365 | return -EIO; | |
366 | set_nlink(inode, num_subdirs + EXFAT_MIN_SUBDIR); | |
367 | ||
368 | inode->i_uid = sbi->options.fs_uid; | |
369 | inode->i_gid = sbi->options.fs_gid; | |
370 | inode_inc_iversion(inode); | |
371 | inode->i_generation = 0; | |
372 | inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, 0777); | |
373 | inode->i_op = &exfat_dir_inode_operations; | |
374 | inode->i_fop = &exfat_dir_operations; | |
375 | ||
39c1ce8e | 376 | inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9; |
7dee6f57 CVB |
377 | ei->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff; |
378 | ei->i_size_aligned = i_size_read(inode); | |
379 | ei->i_size_ondisk = i_size_read(inode); | |
719c1e18 NJ |
380 | |
381 | exfat_save_attr(inode, ATTR_SUBDIR); | |
382 | inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = | |
383 | current_time(inode); | |
81df1ad4 | 384 | exfat_truncate_atime(&inode->i_atime); |
719c1e18 NJ |
385 | return 0; |
386 | } | |
387 | ||
33404a15 | 388 | static int exfat_calibrate_blocksize(struct super_block *sb, int logical_sect) |
719c1e18 | 389 | { |
b0516833 | 390 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
719c1e18 | 391 | |
78c276f5 | 392 | if (!is_power_of_2(logical_sect)) { |
d1727d55 | 393 | exfat_err(sb, "bogus logical sector size %u", logical_sect); |
33404a15 | 394 | return -EIO; |
719c1e18 NJ |
395 | } |
396 | ||
397 | if (logical_sect < sb->s_blocksize) { | |
d1727d55 JP |
398 | exfat_err(sb, "logical sector size too small for device (logical sector size = %u)", |
399 | logical_sect); | |
33404a15 | 400 | return -EIO; |
719c1e18 NJ |
401 | } |
402 | ||
403 | if (logical_sect > sb->s_blocksize) { | |
181a9e80 TK |
404 | brelse(sbi->boot_bh); |
405 | sbi->boot_bh = NULL; | |
719c1e18 NJ |
406 | |
407 | if (!sb_set_blocksize(sb, logical_sect)) { | |
d1727d55 JP |
408 | exfat_err(sb, "unable to set blocksize %u", |
409 | logical_sect); | |
33404a15 | 410 | return -EIO; |
719c1e18 | 411 | } |
181a9e80 TK |
412 | sbi->boot_bh = sb_bread(sb, 0); |
413 | if (!sbi->boot_bh) { | |
d1727d55 JP |
414 | exfat_err(sb, "unable to read boot sector (logical sector size = %lu)", |
415 | sb->s_blocksize); | |
33404a15 | 416 | return -EIO; |
719c1e18 | 417 | } |
719c1e18 | 418 | } |
33404a15 | 419 | return 0; |
719c1e18 NJ |
420 | } |
421 | ||
33404a15 | 422 | static int exfat_read_boot_sector(struct super_block *sb) |
719c1e18 | 423 | { |
181a9e80 | 424 | struct boot_sector *p_boot; |
719c1e18 NJ |
425 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
426 | ||
427 | /* set block size to read super block */ | |
428 | sb_min_blocksize(sb, 512); | |
429 | ||
430 | /* read boot sector */ | |
181a9e80 TK |
431 | sbi->boot_bh = sb_bread(sb, 0); |
432 | if (!sbi->boot_bh) { | |
d1727d55 | 433 | exfat_err(sb, "unable to read boot sector"); |
719c1e18 NJ |
434 | return -EIO; |
435 | } | |
181a9e80 | 436 | p_boot = (struct boot_sector *)sbi->boot_bh->b_data; |
719c1e18 | 437 | |
181a9e80 TK |
438 | /* check the validity of BOOT */ |
439 | if (le16_to_cpu((p_boot->signature)) != BOOT_SIGNATURE) { | |
d1727d55 | 440 | exfat_err(sb, "invalid boot record signature"); |
33404a15 | 441 | return -EINVAL; |
719c1e18 NJ |
442 | } |
443 | ||
33404a15 TK |
444 | if (memcmp(p_boot->fs_name, STR_EXFAT, BOOTSEC_FS_NAME_LEN)) { |
445 | exfat_err(sb, "invalid fs_name"); /* fs_name may unprintable */ | |
446 | return -EINVAL; | |
719c1e18 NJ |
447 | } |
448 | ||
449 | /* | |
33404a15 | 450 | * must_be_zero field must be filled with zero to prevent mounting |
719c1e18 NJ |
451 | * from FAT volume. |
452 | */ | |
33404a15 TK |
453 | if (memchr_inv(p_boot->must_be_zero, 0, sizeof(p_boot->must_be_zero))) |
454 | return -EINVAL; | |
719c1e18 | 455 | |
33404a15 | 456 | if (p_boot->num_fats != 1 && p_boot->num_fats != 2) { |
d1727d55 | 457 | exfat_err(sb, "bogus number of FAT structure"); |
33404a15 | 458 | return -EINVAL; |
719c1e18 NJ |
459 | } |
460 | ||
78c276f5 NJ |
461 | /* |
462 | * sect_size_bits could be at least 9 and at most 12. | |
463 | */ | |
464 | if (p_boot->sect_size_bits < EXFAT_MIN_SECT_SIZE_BITS || | |
465 | p_boot->sect_size_bits > EXFAT_MAX_SECT_SIZE_BITS) { | |
512b74d1 | 466 | exfat_err(sb, "bogus sector size bits : %u", |
78c276f5 NJ |
467 | p_boot->sect_size_bits); |
468 | return -EINVAL; | |
469 | } | |
470 | ||
471 | /* | |
472 | * sect_per_clus_bits could be at least 0 and at most 25 - sect_size_bits. | |
473 | */ | |
474 | if (p_boot->sect_per_clus_bits > EXFAT_MAX_SECT_PER_CLUS_BITS(p_boot)) { | |
512b74d1 | 475 | exfat_err(sb, "bogus sectors bits per cluster : %u", |
78c276f5 NJ |
476 | p_boot->sect_per_clus_bits); |
477 | return -EINVAL; | |
478 | } | |
479 | ||
181a9e80 TK |
480 | sbi->sect_per_clus = 1 << p_boot->sect_per_clus_bits; |
481 | sbi->sect_per_clus_bits = p_boot->sect_per_clus_bits; | |
33404a15 TK |
482 | sbi->cluster_size_bits = p_boot->sect_per_clus_bits + |
483 | p_boot->sect_size_bits; | |
719c1e18 | 484 | sbi->cluster_size = 1 << sbi->cluster_size_bits; |
181a9e80 TK |
485 | sbi->num_FAT_sectors = le32_to_cpu(p_boot->fat_length); |
486 | sbi->FAT1_start_sector = le32_to_cpu(p_boot->fat_offset); | |
33404a15 TK |
487 | sbi->FAT2_start_sector = le32_to_cpu(p_boot->fat_offset); |
488 | if (p_boot->num_fats == 2) | |
489 | sbi->FAT2_start_sector += sbi->num_FAT_sectors; | |
181a9e80 TK |
490 | sbi->data_start_sector = le32_to_cpu(p_boot->clu_offset); |
491 | sbi->num_sectors = le64_to_cpu(p_boot->vol_length); | |
719c1e18 | 492 | /* because the cluster index starts with 2 */ |
181a9e80 | 493 | sbi->num_clusters = le32_to_cpu(p_boot->clu_count) + |
719c1e18 NJ |
494 | EXFAT_RESERVED_CLUSTERS; |
495 | ||
181a9e80 | 496 | sbi->root_dir = le32_to_cpu(p_boot->root_cluster); |
719c1e18 NJ |
497 | sbi->dentries_per_clu = 1 << |
498 | (sbi->cluster_size_bits - DENTRY_SIZE_BITS); | |
499 | ||
7018ec68 TK |
500 | sbi->vol_flags = le16_to_cpu(p_boot->vol_flags); |
501 | sbi->vol_flags_persistent = sbi->vol_flags & (VOLUME_DIRTY | MEDIA_FAILURE); | |
719c1e18 NJ |
502 | sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER; |
503 | sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED; | |
504 | ||
33404a15 | 505 | /* check consistencies */ |
78c276f5 NJ |
506 | if ((u64)sbi->num_FAT_sectors << p_boot->sect_size_bits < |
507 | (u64)sbi->num_clusters * 4) { | |
33404a15 TK |
508 | exfat_err(sb, "bogus fat length"); |
509 | return -EINVAL; | |
510 | } | |
78c276f5 | 511 | |
33404a15 | 512 | if (sbi->data_start_sector < |
78c276f5 NJ |
513 | (u64)sbi->FAT1_start_sector + |
514 | (u64)sbi->num_FAT_sectors * p_boot->num_fats) { | |
33404a15 TK |
515 | exfat_err(sb, "bogus data start sector"); |
516 | return -EINVAL; | |
719c1e18 | 517 | } |
78c276f5 | 518 | |
7018ec68 | 519 | if (sbi->vol_flags & VOLUME_DIRTY) |
33404a15 | 520 | exfat_warn(sb, "Volume was not properly unmounted. Some data may be corrupt. Please run fsck."); |
7018ec68 | 521 | if (sbi->vol_flags & MEDIA_FAILURE) |
33404a15 | 522 | exfat_warn(sb, "Medium has reported failures. Some data may be lost."); |
719c1e18 NJ |
523 | |
524 | /* exFAT file size is limited by a disk volume size */ | |
525 | sb->s_maxbytes = (u64)(sbi->num_clusters - EXFAT_RESERVED_CLUSTERS) << | |
526 | sbi->cluster_size_bits; | |
527 | ||
33404a15 TK |
528 | /* check logical sector size */ |
529 | if (exfat_calibrate_blocksize(sb, 1 << p_boot->sect_size_bits)) | |
530 | return -EIO; | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
476189c0 TK |
535 | static int exfat_verify_boot_region(struct super_block *sb) |
536 | { | |
537 | struct buffer_head *bh = NULL; | |
538 | u32 chksum = 0; | |
539 | __le32 *p_sig, *p_chksum; | |
540 | int sn, i; | |
541 | ||
542 | /* read boot sector sub-regions */ | |
543 | for (sn = 0; sn < 11; sn++) { | |
544 | bh = sb_bread(sb, sn); | |
545 | if (!bh) | |
546 | return -EIO; | |
547 | ||
548 | if (sn != 0 && sn <= 8) { | |
549 | /* extended boot sector sub-regions */ | |
550 | p_sig = (__le32 *)&bh->b_data[sb->s_blocksize - 4]; | |
551 | if (le32_to_cpu(*p_sig) != EXBOOT_SIGNATURE) | |
552 | exfat_warn(sb, "Invalid exboot-signature(sector = %d): 0x%08x", | |
553 | sn, le32_to_cpu(*p_sig)); | |
554 | } | |
555 | ||
556 | chksum = exfat_calc_chksum32(bh->b_data, sb->s_blocksize, | |
557 | chksum, sn ? CS_DEFAULT : CS_BOOT_SECTOR); | |
558 | brelse(bh); | |
559 | } | |
560 | ||
561 | /* boot checksum sub-regions */ | |
562 | bh = sb_bread(sb, sn); | |
563 | if (!bh) | |
564 | return -EIO; | |
565 | ||
566 | for (i = 0; i < sb->s_blocksize; i += sizeof(u32)) { | |
567 | p_chksum = (__le32 *)&bh->b_data[i]; | |
568 | if (le32_to_cpu(*p_chksum) != chksum) { | |
569 | exfat_err(sb, "Invalid boot checksum (boot checksum : 0x%08x, checksum : 0x%08x)", | |
570 | le32_to_cpu(*p_chksum), chksum); | |
571 | brelse(bh); | |
572 | return -EINVAL; | |
573 | } | |
574 | } | |
575 | brelse(bh); | |
576 | return 0; | |
577 | } | |
578 | ||
33404a15 TK |
579 | /* mount the file system volume */ |
580 | static int __exfat_fill_super(struct super_block *sb) | |
581 | { | |
582 | int ret; | |
583 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
584 | ||
585 | ret = exfat_read_boot_sector(sb); | |
586 | if (ret) { | |
587 | exfat_err(sb, "failed to read boot sector"); | |
588 | goto free_bh; | |
476189c0 TK |
589 | } |
590 | ||
591 | ret = exfat_verify_boot_region(sb); | |
592 | if (ret) { | |
593 | exfat_err(sb, "invalid boot region"); | |
594 | goto free_bh; | |
33404a15 TK |
595 | } |
596 | ||
719c1e18 NJ |
597 | ret = exfat_create_upcase_table(sb); |
598 | if (ret) { | |
d1727d55 | 599 | exfat_err(sb, "failed to load upcase table"); |
719c1e18 NJ |
600 | goto free_bh; |
601 | } | |
602 | ||
603 | ret = exfat_load_bitmap(sb); | |
604 | if (ret) { | |
d1727d55 | 605 | exfat_err(sb, "failed to load alloc-bitmap"); |
719c1e18 NJ |
606 | goto free_upcase_table; |
607 | } | |
608 | ||
609 | ret = exfat_count_used_clusters(sb, &sbi->used_clusters); | |
610 | if (ret) { | |
d1727d55 | 611 | exfat_err(sb, "failed to scan clusters"); |
719c1e18 NJ |
612 | goto free_alloc_bitmap; |
613 | } | |
614 | ||
615 | return 0; | |
616 | ||
617 | free_alloc_bitmap: | |
618 | exfat_free_bitmap(sbi); | |
619 | free_upcase_table: | |
620 | exfat_free_upcase_table(sbi); | |
621 | free_bh: | |
181a9e80 | 622 | brelse(sbi->boot_bh); |
719c1e18 NJ |
623 | return ret; |
624 | } | |
625 | ||
626 | static int exfat_fill_super(struct super_block *sb, struct fs_context *fc) | |
627 | { | |
628 | struct exfat_sb_info *sbi = sb->s_fs_info; | |
629 | struct exfat_mount_options *opts = &sbi->options; | |
630 | struct inode *root_inode; | |
631 | int err; | |
632 | ||
633 | if (opts->allow_utime == (unsigned short)-1) | |
634 | opts->allow_utime = ~opts->fs_dmask & 0022; | |
635 | ||
70200574 CH |
636 | if (opts->discard && !bdev_max_discard_sectors(sb->s_bdev)) { |
637 | exfat_warn(sb, "mounting with \"discard\" option, but the device does not support discard"); | |
638 | opts->discard = 0; | |
719c1e18 NJ |
639 | } |
640 | ||
641 | sb->s_flags |= SB_NODIRATIME; | |
642 | sb->s_magic = EXFAT_SUPER_MAGIC; | |
643 | sb->s_op = &exfat_sops; | |
644 | ||
674a9985 | 645 | sb->s_time_gran = 10 * NSEC_PER_MSEC; |
719c1e18 NJ |
646 | sb->s_time_min = EXFAT_MIN_TIMESTAMP_SECS; |
647 | sb->s_time_max = EXFAT_MAX_TIMESTAMP_SECS; | |
648 | ||
649 | err = __exfat_fill_super(sb); | |
650 | if (err) { | |
d1727d55 | 651 | exfat_err(sb, "failed to recognize exfat type"); |
719c1e18 NJ |
652 | goto check_nls_io; |
653 | } | |
654 | ||
655 | /* set up enough so that it can read an inode */ | |
656 | exfat_hash_init(sb); | |
657 | ||
658 | if (!strcmp(sbi->options.iocharset, "utf8")) | |
659 | opts->utf8 = 1; | |
660 | else { | |
661 | sbi->nls_io = load_nls(sbi->options.iocharset); | |
662 | if (!sbi->nls_io) { | |
d1727d55 JP |
663 | exfat_err(sb, "IO charset %s not found", |
664 | sbi->options.iocharset); | |
719c1e18 NJ |
665 | err = -EINVAL; |
666 | goto free_table; | |
667 | } | |
668 | } | |
669 | ||
670 | if (sbi->options.utf8) | |
671 | sb->s_d_op = &exfat_utf8_dentry_ops; | |
672 | else | |
673 | sb->s_d_op = &exfat_dentry_ops; | |
674 | ||
675 | root_inode = new_inode(sb); | |
676 | if (!root_inode) { | |
d1727d55 | 677 | exfat_err(sb, "failed to allocate root inode"); |
719c1e18 NJ |
678 | err = -ENOMEM; |
679 | goto free_table; | |
680 | } | |
681 | ||
682 | root_inode->i_ino = EXFAT_ROOT_INO; | |
683 | inode_set_iversion(root_inode, 1); | |
684 | err = exfat_read_root(root_inode); | |
685 | if (err) { | |
d1727d55 | 686 | exfat_err(sb, "failed to initialize root inode"); |
719c1e18 NJ |
687 | goto put_inode; |
688 | } | |
689 | ||
690 | exfat_hash_inode(root_inode, EXFAT_I(root_inode)->i_pos); | |
691 | insert_inode_hash(root_inode); | |
692 | ||
693 | sb->s_root = d_make_root(root_inode); | |
694 | if (!sb->s_root) { | |
d1727d55 | 695 | exfat_err(sb, "failed to get the root dentry"); |
719c1e18 | 696 | err = -ENOMEM; |
839a534f | 697 | goto free_table; |
719c1e18 NJ |
698 | } |
699 | ||
700 | return 0; | |
701 | ||
702 | put_inode: | |
703 | iput(root_inode); | |
704 | sb->s_root = NULL; | |
705 | ||
706 | free_table: | |
707 | exfat_free_upcase_table(sbi); | |
708 | exfat_free_bitmap(sbi); | |
181a9e80 | 709 | brelse(sbi->boot_bh); |
719c1e18 NJ |
710 | |
711 | check_nls_io: | |
712 | unload_nls(sbi->nls_io); | |
713 | exfat_free_iocharset(sbi); | |
714 | sb->s_fs_info = NULL; | |
715 | kfree(sbi); | |
716 | return err; | |
717 | } | |
718 | ||
719 | static int exfat_get_tree(struct fs_context *fc) | |
720 | { | |
721 | return get_tree_bdev(fc, exfat_fill_super); | |
722 | } | |
723 | ||
724 | static void exfat_free(struct fs_context *fc) | |
725 | { | |
f341a7d8 AV |
726 | struct exfat_sb_info *sbi = fc->s_fs_info; |
727 | ||
728 | if (sbi) { | |
729 | exfat_free_iocharset(sbi); | |
730 | kfree(sbi); | |
731 | } | |
719c1e18 NJ |
732 | } |
733 | ||
a0271a15 HL |
734 | static int exfat_reconfigure(struct fs_context *fc) |
735 | { | |
736 | fc->sb_flags |= SB_NODIRATIME; | |
737 | ||
738 | /* volume flag will be updated in exfat_sync_fs */ | |
739 | sync_filesystem(fc->root->d_sb); | |
740 | return 0; | |
741 | } | |
742 | ||
719c1e18 NJ |
743 | static const struct fs_context_operations exfat_context_ops = { |
744 | .parse_param = exfat_parse_param, | |
745 | .get_tree = exfat_get_tree, | |
746 | .free = exfat_free, | |
a0271a15 | 747 | .reconfigure = exfat_reconfigure, |
719c1e18 NJ |
748 | }; |
749 | ||
750 | static int exfat_init_fs_context(struct fs_context *fc) | |
751 | { | |
752 | struct exfat_sb_info *sbi; | |
753 | ||
754 | sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL); | |
755 | if (!sbi) | |
756 | return -ENOMEM; | |
757 | ||
758 | mutex_init(&sbi->s_lock); | |
5c2d7285 | 759 | mutex_init(&sbi->bitmap_lock); |
719c1e18 NJ |
760 | ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, |
761 | DEFAULT_RATELIMIT_BURST); | |
762 | ||
763 | sbi->options.fs_uid = current_uid(); | |
764 | sbi->options.fs_gid = current_gid(); | |
765 | sbi->options.fs_fmask = current->fs->umask; | |
766 | sbi->options.fs_dmask = current->fs->umask; | |
767 | sbi->options.allow_utime = -1; | |
768 | sbi->options.iocharset = exfat_default_iocharset; | |
769 | sbi->options.errors = EXFAT_ERRORS_RO; | |
770 | ||
771 | fc->s_fs_info = sbi; | |
772 | fc->ops = &exfat_context_ops; | |
773 | return 0; | |
774 | } | |
775 | ||
776 | static struct file_system_type exfat_fs_type = { | |
777 | .owner = THIS_MODULE, | |
778 | .name = "exfat", | |
779 | .init_fs_context = exfat_init_fs_context, | |
9acd0d53 | 780 | .parameters = exfat_parameters, |
719c1e18 NJ |
781 | .kill_sb = kill_block_super, |
782 | .fs_flags = FS_REQUIRES_DEV, | |
783 | }; | |
784 | ||
785 | static void exfat_inode_init_once(void *foo) | |
786 | { | |
787 | struct exfat_inode_info *ei = (struct exfat_inode_info *)foo; | |
788 | ||
8ff006e5 NJ |
789 | spin_lock_init(&ei->cache_lru_lock); |
790 | ei->nr_caches = 0; | |
791 | ei->cache_valid_id = EXFAT_CACHE_VALID + 1; | |
792 | INIT_LIST_HEAD(&ei->cache_lru); | |
719c1e18 NJ |
793 | INIT_HLIST_NODE(&ei->i_hash_fat); |
794 | inode_init_once(&ei->vfs_inode); | |
795 | } | |
796 | ||
797 | static int __init init_exfat_fs(void) | |
798 | { | |
799 | int err; | |
800 | ||
801 | err = exfat_cache_init(); | |
802 | if (err) | |
803 | return err; | |
804 | ||
805 | exfat_inode_cachep = kmem_cache_create("exfat_inode_cache", | |
806 | sizeof(struct exfat_inode_info), | |
807 | 0, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, | |
808 | exfat_inode_init_once); | |
809 | if (!exfat_inode_cachep) { | |
810 | err = -ENOMEM; | |
811 | goto shutdown_cache; | |
812 | } | |
813 | ||
814 | err = register_filesystem(&exfat_fs_type); | |
815 | if (err) | |
816 | goto destroy_cache; | |
817 | ||
818 | return 0; | |
819 | ||
820 | destroy_cache: | |
821 | kmem_cache_destroy(exfat_inode_cachep); | |
822 | shutdown_cache: | |
823 | exfat_cache_shutdown(); | |
824 | return err; | |
825 | } | |
826 | ||
827 | static void __exit exit_exfat_fs(void) | |
828 | { | |
829 | /* | |
830 | * Make sure all delayed rcu free inodes are flushed before we | |
831 | * destroy cache. | |
832 | */ | |
833 | rcu_barrier(); | |
834 | kmem_cache_destroy(exfat_inode_cachep); | |
835 | unregister_filesystem(&exfat_fs_type); | |
836 | exfat_cache_shutdown(); | |
837 | } | |
838 | ||
839 | module_init(init_exfat_fs); | |
840 | module_exit(exit_exfat_fs); | |
841 | ||
cd76ac25 | 842 | MODULE_ALIAS_FS("exfat"); |
719c1e18 NJ |
843 | MODULE_LICENSE("GPL"); |
844 | MODULE_DESCRIPTION("exFAT filesystem support"); | |
845 | MODULE_AUTHOR("Samsung Electronics Co., Ltd."); |