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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
24static char exfat_default_iocharset[] = CONFIG_EXFAT_DEFAULT_IOCHARSET;
25static struct kmem_cache *exfat_inode_cachep;
26
27static 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
33static 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
43static 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);
48 exfat_free_bitmap(sbi);
49 brelse(sbi->boot_bh);
50 mutex_unlock(&sbi->s_lock);
51
52 call_rcu(&sbi->rcu, exfat_delayed_free);
53}
54
55static 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
60 if (!wait)
61 return 0;
62
63
64 mutex_lock(&sbi->s_lock);
65 sync_blockdev(sb->s_bdev);
66 if (exfat_clear_volume_dirty(sb))
67 err = -EIO;
68 mutex_unlock(&sbi->s_lock);
69 return err;
70}
71
72static 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;
90 buf->f_bfree = buf->f_blocks - sbi->used_clusters;
91 buf->f_bavail = buf->f_bfree;
92 buf->f_fsid = u64_to_fsid(id);
93
94 buf->f_namelen = EXFAT_MAX_FILE_LEN * NLS_MAX_CHARSET_SIZE;
95 return 0;
96}
97
98static int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flags)
99{
100 struct exfat_sb_info *sbi = EXFAT_SB(sb);
101 struct boot_sector *p_boot = (struct boot_sector *)sbi->boot_bh->b_data;
102 bool sync;
103
104
105 new_flags |= sbi->vol_flags_persistent;
106
107
108 if (sbi->vol_flags == new_flags)
109 return 0;
110
111 sbi->vol_flags = new_flags;
112
113
114
115
116 if (sb_rdonly(sb))
117 return 0;
118
119 p_boot->vol_flags = cpu_to_le16(new_flags);
120
121 if ((new_flags & VOLUME_DIRTY) && !buffer_dirty(sbi->boot_bh))
122 sync = true;
123 else
124 sync = false;
125
126 set_buffer_uptodate(sbi->boot_bh);
127 mark_buffer_dirty(sbi->boot_bh);
128
129 if (sync)
130 sync_dirty_buffer(sbi->boot_bh);
131 return 0;
132}
133
134int 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
141int 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
148static 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
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);
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
181static 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
193static void exfat_free_inode(struct inode *inode)
194{
195 kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode));
196}
197
198static 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
209enum {
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,
220
221
222 Opt_utf8,
223 Opt_debug,
224 Opt_namecase,
225 Opt_codepage,
226};
227
228static 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
235static const struct fs_parameter_spec exfat_parameters[] = {
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),
243 fsparam_enum("errors", Opt_errors, exfat_param_enums),
244 fsparam_flag("discard", Opt_discard),
245 fsparam_s32("time_offset", Opt_time_offset),
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),
254 {}
255};
256
257static 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
264 opt = fs_parse(fc, exfat_parameters, param, &result);
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);
290 opts->iocharset = param->string;
291 param->string = NULL;
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
302
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;
308 case Opt_utf8:
309 case Opt_debug:
310 case Opt_namecase:
311 case Opt_codepage:
312 break;
313 default:
314 return -EINVAL;
315 }
316
317 return 0;
318}
319
320static 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
330static 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;
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);
376 exfat_truncate_atime(&inode->i_atime);
377 return 0;
378}
379
380static int exfat_calibrate_blocksize(struct super_block *sb, int logical_sect)
381{
382 struct exfat_sb_info *sbi = EXFAT_SB(sb);
383
384 if (!is_power_of_2(logical_sect)) {
385 exfat_err(sb, "bogus logical sector size %u", logical_sect);
386 return -EIO;
387 }
388
389 if (logical_sect < sb->s_blocksize) {
390 exfat_err(sb, "logical sector size too small for device (logical sector size = %u)",
391 logical_sect);
392 return -EIO;
393 }
394
395 if (logical_sect > sb->s_blocksize) {
396 brelse(sbi->boot_bh);
397 sbi->boot_bh = NULL;
398
399 if (!sb_set_blocksize(sb, logical_sect)) {
400 exfat_err(sb, "unable to set blocksize %u",
401 logical_sect);
402 return -EIO;
403 }
404 sbi->boot_bh = sb_bread(sb, 0);
405 if (!sbi->boot_bh) {
406 exfat_err(sb, "unable to read boot sector (logical sector size = %lu)",
407 sb->s_blocksize);
408 return -EIO;
409 }
410 }
411 return 0;
412}
413
414static int exfat_read_boot_sector(struct super_block *sb)
415{
416 struct boot_sector *p_boot;
417 struct exfat_sb_info *sbi = EXFAT_SB(sb);
418
419
420 sb_min_blocksize(sb, 512);
421
422
423 sbi->boot_bh = sb_bread(sb, 0);
424 if (!sbi->boot_bh) {
425 exfat_err(sb, "unable to read boot sector");
426 return -EIO;
427 }
428 p_boot = (struct boot_sector *)sbi->boot_bh->b_data;
429
430
431 if (le16_to_cpu((p_boot->signature)) != BOOT_SIGNATURE) {
432 exfat_err(sb, "invalid boot record signature");
433 return -EINVAL;
434 }
435
436 if (memcmp(p_boot->fs_name, STR_EXFAT, BOOTSEC_FS_NAME_LEN)) {
437 exfat_err(sb, "invalid fs_name");
438 return -EINVAL;
439 }
440
441
442
443
444
445 if (memchr_inv(p_boot->must_be_zero, 0, sizeof(p_boot->must_be_zero)))
446 return -EINVAL;
447
448 if (p_boot->num_fats != 1 && p_boot->num_fats != 2) {
449 exfat_err(sb, "bogus number of FAT structure");
450 return -EINVAL;
451 }
452
453
454
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
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
472 sbi->sect_per_clus = 1 << p_boot->sect_per_clus_bits;
473 sbi->sect_per_clus_bits = p_boot->sect_per_clus_bits;
474 sbi->cluster_size_bits = p_boot->sect_per_clus_bits +
475 p_boot->sect_size_bits;
476 sbi->cluster_size = 1 << sbi->cluster_size_bits;
477 sbi->num_FAT_sectors = le32_to_cpu(p_boot->fat_length);
478 sbi->FAT1_start_sector = le32_to_cpu(p_boot->fat_offset);
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;
482 sbi->data_start_sector = le32_to_cpu(p_boot->clu_offset);
483 sbi->num_sectors = le64_to_cpu(p_boot->vol_length);
484
485 sbi->num_clusters = le32_to_cpu(p_boot->clu_count) +
486 EXFAT_RESERVED_CLUSTERS;
487
488 sbi->root_dir = le32_to_cpu(p_boot->root_cluster);
489 sbi->dentries_per_clu = 1 <<
490 (sbi->cluster_size_bits - DENTRY_SIZE_BITS);
491
492 sbi->vol_flags = le16_to_cpu(p_boot->vol_flags);
493 sbi->vol_flags_persistent = sbi->vol_flags & (VOLUME_DIRTY | MEDIA_FAILURE);
494 sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER;
495 sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED;
496
497
498 if ((u64)sbi->num_FAT_sectors << p_boot->sect_size_bits <
499 (u64)sbi->num_clusters * 4) {
500 exfat_err(sb, "bogus fat length");
501 return -EINVAL;
502 }
503
504 if (sbi->data_start_sector <
505 (u64)sbi->FAT1_start_sector +
506 (u64)sbi->num_FAT_sectors * p_boot->num_fats) {
507 exfat_err(sb, "bogus data start sector");
508 return -EINVAL;
509 }
510
511 if (sbi->vol_flags & VOLUME_DIRTY)
512 exfat_warn(sb, "Volume was not properly unmounted. Some data may be corrupt. Please run fsck.");
513 if (sbi->vol_flags & MEDIA_FAILURE)
514 exfat_warn(sb, "Medium has reported failures. Some data may be lost.");
515
516
517 sb->s_maxbytes = (u64)(sbi->num_clusters - EXFAT_RESERVED_CLUSTERS) <<
518 sbi->cluster_size_bits;
519
520
521 if (exfat_calibrate_blocksize(sb, 1 << p_boot->sect_size_bits))
522 return -EIO;
523
524 return 0;
525}
526
527static 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
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
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
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
571
572static 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;
581 }
582
583 ret = exfat_verify_boot_region(sb);
584 if (ret) {
585 exfat_err(sb, "invalid boot region");
586 goto free_bh;
587 }
588
589 ret = exfat_create_upcase_table(sb);
590 if (ret) {
591 exfat_err(sb, "failed to load upcase table");
592 goto free_bh;
593 }
594
595 ret = exfat_load_bitmap(sb);
596 if (ret) {
597 exfat_err(sb, "failed to load alloc-bitmap");
598 goto free_upcase_table;
599 }
600
601 ret = exfat_count_used_clusters(sb, &sbi->used_clusters);
602 if (ret) {
603 exfat_err(sb, "failed to scan clusters");
604 goto free_alloc_bitmap;
605 }
606
607 return 0;
608
609free_alloc_bitmap:
610 exfat_free_bitmap(sbi);
611free_upcase_table:
612 exfat_free_upcase_table(sbi);
613free_bh:
614 brelse(sbi->boot_bh);
615 return ret;
616}
617
618static 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
631 if (!blk_queue_discard(q)) {
632 exfat_warn(sb, "mounting with \"discard\" option, but the device does not support discard");
633 opts->discard = 0;
634 }
635 }
636
637 sb->s_flags |= SB_NODIRATIME;
638 sb->s_magic = EXFAT_SUPER_MAGIC;
639 sb->s_op = &exfat_sops;
640
641 sb->s_time_gran = 10 * NSEC_PER_MSEC;
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) {
647 exfat_err(sb, "failed to recognize exfat type");
648 goto check_nls_io;
649 }
650
651
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) {
659 exfat_err(sb, "IO charset %s not found",
660 sbi->options.iocharset);
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) {
673 exfat_err(sb, "failed to allocate root inode");
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) {
682 exfat_err(sb, "failed to initialize root inode");
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) {
691 exfat_err(sb, "failed to get the root dentry");
692 err = -ENOMEM;
693 goto free_table;
694 }
695
696 return 0;
697
698put_inode:
699 iput(root_inode);
700 sb->s_root = NULL;
701
702free_table:
703 exfat_free_upcase_table(sbi);
704 exfat_free_bitmap(sbi);
705 brelse(sbi->boot_bh);
706
707check_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
715static int exfat_get_tree(struct fs_context *fc)
716{
717 return get_tree_bdev(fc, exfat_fill_super);
718}
719
720static void exfat_free(struct fs_context *fc)
721{
722 struct exfat_sb_info *sbi = fc->s_fs_info;
723
724 if (sbi) {
725 exfat_free_iocharset(sbi);
726 kfree(sbi);
727 }
728}
729
730static int exfat_reconfigure(struct fs_context *fc)
731{
732 fc->sb_flags |= SB_NODIRATIME;
733
734
735 sync_filesystem(fc->root->d_sb);
736 return 0;
737}
738
739static const struct fs_context_operations exfat_context_ops = {
740 .parse_param = exfat_parse_param,
741 .get_tree = exfat_get_tree,
742 .free = exfat_free,
743 .reconfigure = exfat_reconfigure,
744};
745
746static 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 mutex_init(&sbi->bitmap_lock);
756 ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL,
757 DEFAULT_RATELIMIT_BURST);
758
759 sbi->options.fs_uid = current_uid();
760 sbi->options.fs_gid = current_gid();
761 sbi->options.fs_fmask = current->fs->umask;
762 sbi->options.fs_dmask = current->fs->umask;
763 sbi->options.allow_utime = -1;
764 sbi->options.iocharset = exfat_default_iocharset;
765 sbi->options.errors = EXFAT_ERRORS_RO;
766
767 fc->s_fs_info = sbi;
768 fc->ops = &exfat_context_ops;
769 return 0;
770}
771
772static struct file_system_type exfat_fs_type = {
773 .owner = THIS_MODULE,
774 .name = "exfat",
775 .init_fs_context = exfat_init_fs_context,
776 .parameters = exfat_parameters,
777 .kill_sb = kill_block_super,
778 .fs_flags = FS_REQUIRES_DEV,
779};
780
781static void exfat_inode_init_once(void *foo)
782{
783 struct exfat_inode_info *ei = (struct exfat_inode_info *)foo;
784
785 spin_lock_init(&ei->cache_lru_lock);
786 ei->nr_caches = 0;
787 ei->cache_valid_id = EXFAT_CACHE_VALID + 1;
788 INIT_LIST_HEAD(&ei->cache_lru);
789 INIT_HLIST_NODE(&ei->i_hash_fat);
790 inode_init_once(&ei->vfs_inode);
791}
792
793static int __init init_exfat_fs(void)
794{
795 int err;
796
797 err = exfat_cache_init();
798 if (err)
799 return err;
800
801 exfat_inode_cachep = kmem_cache_create("exfat_inode_cache",
802 sizeof(struct exfat_inode_info),
803 0, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
804 exfat_inode_init_once);
805 if (!exfat_inode_cachep) {
806 err = -ENOMEM;
807 goto shutdown_cache;
808 }
809
810 err = register_filesystem(&exfat_fs_type);
811 if (err)
812 goto destroy_cache;
813
814 return 0;
815
816destroy_cache:
817 kmem_cache_destroy(exfat_inode_cachep);
818shutdown_cache:
819 exfat_cache_shutdown();
820 return err;
821}
822
823static void __exit exit_exfat_fs(void)
824{
825
826
827
828
829 rcu_barrier();
830 kmem_cache_destroy(exfat_inode_cachep);
831 unregister_filesystem(&exfat_fs_type);
832 exfat_cache_shutdown();
833}
834
835module_init(init_exfat_fs);
836module_exit(exit_exfat_fs);
837
838MODULE_ALIAS_FS("exfat");
839MODULE_LICENSE("GPL");
840MODULE_DESCRIPTION("exFAT filesystem support");
841MODULE_AUTHOR("Samsung Electronics Co., Ltd.");
842
