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dm writecache: correct uncommitted_block when discarding uncommitted entry
[linux/fpc-iii.git] / fs / exfat / super.c
blobc1b1ed306a4858abfb0166c53a4d4ee05b5a3428
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);
48 if (test_and_clear_bit(EXFAT_SB_DIRTY, &sbi->s_state))
49 sync_blockdev(sb->s_bdev);
50 exfat_set_vol_flags(sb, VOL_CLEAN);
51 exfat_free_bitmap(sbi);
52 brelse(sbi->pbr_bh);
53 mutex_unlock(&sbi->s_lock);
54
55 call_rcu(&sbi->rcu, exfat_delayed_free);
56 }
57
58 static int exfat_sync_fs(struct super_block *sb, int wait)
59 {
60 struct exfat_sb_info *sbi = EXFAT_SB(sb);
61 int err = 0;
62
63 /* If there are some dirty buffers in the bdev inode */
64 mutex_lock(&sbi->s_lock);
65 if (test_and_clear_bit(EXFAT_SB_DIRTY, &sbi->s_state)) {
66 sync_blockdev(sb->s_bdev);
67 if (exfat_set_vol_flags(sb, VOL_CLEAN))
68 err = -EIO;
69 }
70 mutex_unlock(&sbi->s_lock);
71 return err;
72 }
73
74 static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf)
75 {
76 struct super_block *sb = dentry->d_sb;
77 struct exfat_sb_info *sbi = EXFAT_SB(sb);
78 unsigned long long id = huge_encode_dev(sb->s_bdev->bd_dev);
79
80 if (sbi->used_clusters == EXFAT_CLUSTERS_UNTRACKED) {
81 mutex_lock(&sbi->s_lock);
82 if (exfat_count_used_clusters(sb, &sbi->used_clusters)) {
83 mutex_unlock(&sbi->s_lock);
84 return -EIO;
85 }
86 mutex_unlock(&sbi->s_lock);
87 }
88
89 buf->f_type = sb->s_magic;
90 buf->f_bsize = sbi->cluster_size;
91 buf->f_blocks = sbi->num_clusters - 2; /* clu 0 & 1 */
92 buf->f_bfree = buf->f_blocks - sbi->used_clusters;
93 buf->f_bavail = buf->f_bfree;
94 buf->f_fsid.val[0] = (unsigned int)id;
95 buf->f_fsid.val[1] = (unsigned int)(id >> 32);
96 /* Unicode utf16 255 characters */
97 buf->f_namelen = EXFAT_MAX_FILE_LEN * NLS_MAX_CHARSET_SIZE;
98 return 0;
99 }
100
101 int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flag)
102 {
103 struct exfat_sb_info *sbi = EXFAT_SB(sb);
104 struct pbr64 *bpb = (struct pbr64 *)sbi->pbr_bh->b_data;
105 bool sync = 0;
106
107 /* flags are not changed */
108 if (sbi->vol_flag == new_flag)
109 return 0;
110
111 sbi->vol_flag = new_flag;
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
119 bpb->bsx.vol_flags = cpu_to_le16(new_flag);
120
121 if (new_flag == VOL_DIRTY && !buffer_dirty(sbi->pbr_bh))
122 sync = true;
123 else
124 sync = false;
125
126 set_buffer_uptodate(sbi->pbr_bh);
127 mark_buffer_dirty(sbi->pbr_bh);
128
129 if (sync)
130 sync_dirty_buffer(sbi->pbr_bh);
131 return 0;
132 }
133
134 static int exfat_show_options(struct seq_file *m, struct dentry *root)
135 {
136 struct super_block *sb = root->d_sb;
137 struct exfat_sb_info *sbi = EXFAT_SB(sb);
138 struct exfat_mount_options *opts = &sbi->options;
139
140 /* Show partition info */
141 if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID))
142 seq_printf(m, ",uid=%u",
143 from_kuid_munged(&init_user_ns, opts->fs_uid));
144 if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID))
145 seq_printf(m, ",gid=%u",
146 from_kgid_munged(&init_user_ns, opts->fs_gid));
147 seq_printf(m, ",fmask=%04o,dmask=%04o", opts->fs_fmask, opts->fs_dmask);
148 if (opts->allow_utime)
149 seq_printf(m, ",allow_utime=%04o", opts->allow_utime);
150 if (opts->utf8)
151 seq_puts(m, ",iocharset=utf8");
152 else if (sbi->nls_io)
153 seq_printf(m, ",iocharset=%s", sbi->nls_io->charset);
154 if (opts->errors == EXFAT_ERRORS_CONT)
155 seq_puts(m, ",errors=continue");
156 else if (opts->errors == EXFAT_ERRORS_PANIC)
157 seq_puts(m, ",errors=panic");
158 else
159 seq_puts(m, ",errors=remount-ro");
160 if (opts->discard)
161 seq_puts(m, ",discard");
162 if (opts->time_offset)
163 seq_printf(m, ",time_offset=%d", opts->time_offset);
164 return 0;
165 }
166
167 static struct inode *exfat_alloc_inode(struct super_block *sb)
168 {
169 struct exfat_inode_info *ei;
170
171 ei = kmem_cache_alloc(exfat_inode_cachep, GFP_NOFS);
172 if (!ei)
173 return NULL;
174
175 init_rwsem(&ei->truncate_lock);
176 return &ei->vfs_inode;
177 }
178
179 static void exfat_free_inode(struct inode *inode)
180 {
181 kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode));
182 }
183
184 static const struct super_operations exfat_sops = {
185 .alloc_inode = exfat_alloc_inode,
186 .free_inode = exfat_free_inode,
187 .write_inode = exfat_write_inode,
188 .evict_inode = exfat_evict_inode,
189 .put_super = exfat_put_super,
190 .sync_fs = exfat_sync_fs,
191 .statfs = exfat_statfs,
192 .show_options = exfat_show_options,
193 };
194
195 enum {
196 Opt_uid,
197 Opt_gid,
198 Opt_umask,
199 Opt_dmask,
200 Opt_fmask,
201 Opt_allow_utime,
202 Opt_charset,
203 Opt_errors,
204 Opt_discard,
205 Opt_time_offset,
206
207 /* Deprecated options */
208 Opt_utf8,
209 Opt_debug,
210 Opt_namecase,
211 Opt_codepage,
212 };
213
214 static const struct constant_table exfat_param_enums[] = {
215 { "continue", EXFAT_ERRORS_CONT },
216 { "panic", EXFAT_ERRORS_PANIC },
217 { "remount-ro", EXFAT_ERRORS_RO },
218 {}
219 };
220
221 static const struct fs_parameter_spec exfat_parameters[] = {
222 fsparam_u32("uid", Opt_uid),
223 fsparam_u32("gid", Opt_gid),
224 fsparam_u32oct("umask", Opt_umask),
225 fsparam_u32oct("dmask", Opt_dmask),
226 fsparam_u32oct("fmask", Opt_fmask),
227 fsparam_u32oct("allow_utime", Opt_allow_utime),
228 fsparam_string("iocharset", Opt_charset),
229 fsparam_enum("errors", Opt_errors, exfat_param_enums),
230 fsparam_flag("discard", Opt_discard),
231 fsparam_s32("time_offset", Opt_time_offset),
232 __fsparam(NULL, "utf8", Opt_utf8, fs_param_deprecated,
233 NULL),
234 __fsparam(NULL, "debug", Opt_debug, fs_param_deprecated,
235 NULL),
236 __fsparam(fs_param_is_u32, "namecase", Opt_namecase,
237 fs_param_deprecated, NULL),
238 __fsparam(fs_param_is_u32, "codepage", Opt_codepage,
239 fs_param_deprecated, NULL),
240 {}
241 };
242
243 static int exfat_parse_param(struct fs_context *fc, struct fs_parameter *param)
244 {
245 struct exfat_sb_info *sbi = fc->s_fs_info;
246 struct exfat_mount_options *opts = &sbi->options;
247 struct fs_parse_result result;
248 int opt;
249
250 opt = fs_parse(fc, exfat_parameters, param, &result);
251 if (opt < 0)
252 return opt;
253
254 switch (opt) {
255 case Opt_uid:
256 opts->fs_uid = make_kuid(current_user_ns(), result.uint_32);
257 break;
258 case Opt_gid:
259 opts->fs_gid = make_kgid(current_user_ns(), result.uint_32);
260 break;
261 case Opt_umask:
262 opts->fs_fmask = result.uint_32;
263 opts->fs_dmask = result.uint_32;
264 break;
265 case Opt_dmask:
266 opts->fs_dmask = result.uint_32;
267 break;
268 case Opt_fmask:
269 opts->fs_fmask = result.uint_32;
270 break;
271 case Opt_allow_utime:
272 opts->allow_utime = result.uint_32 & 0022;
273 break;
274 case Opt_charset:
275 exfat_free_iocharset(sbi);
276 opts->iocharset = param->string;
277 param->string = NULL;
278 break;
279 case Opt_errors:
280 opts->errors = result.uint_32;
281 break;
282 case Opt_discard:
283 opts->discard = 1;
284 break;
285 case Opt_time_offset:
286 /*
287 * Make the limit 24 just in case someone invents something
288 * unusual.
289 */
290 if (result.int_32 < -24 * 60 || result.int_32 > 24 * 60)
291 return -EINVAL;
292 opts->time_offset = result.int_32;
293 break;
294 case Opt_utf8:
295 case Opt_debug:
296 case Opt_namecase:
297 case Opt_codepage:
298 break;
299 default:
300 return -EINVAL;
301 }
302
303 return 0;
304 }
305
306 static void exfat_hash_init(struct super_block *sb)
307 {
308 struct exfat_sb_info *sbi = EXFAT_SB(sb);
309 int i;
310
311 spin_lock_init(&sbi->inode_hash_lock);
312 for (i = 0; i < EXFAT_HASH_SIZE; i++)
313 INIT_HLIST_HEAD(&sbi->inode_hashtable[i]);
314 }
315
316 static int exfat_read_root(struct inode *inode)
317 {
318 struct super_block *sb = inode->i_sb;
319 struct exfat_sb_info *sbi = EXFAT_SB(sb);
320 struct exfat_inode_info *ei = EXFAT_I(inode);
321 struct exfat_chain cdir;
322 int num_subdirs, num_clu = 0;
323
324 exfat_chain_set(&ei->dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN);
325 ei->entry = -1;
326 ei->start_clu = sbi->root_dir;
327 ei->flags = ALLOC_FAT_CHAIN;
328 ei->type = TYPE_DIR;
329 ei->version = 0;
330 ei->rwoffset = 0;
331 ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
332 ei->hint_stat.eidx = 0;
333 ei->hint_stat.clu = sbi->root_dir;
334 ei->hint_femp.eidx = EXFAT_HINT_NONE;
335
336 exfat_chain_set(&cdir, sbi->root_dir, 0, ALLOC_FAT_CHAIN);
337 if (exfat_count_num_clusters(sb, &cdir, &num_clu))
338 return -EIO;
339 i_size_write(inode, num_clu << sbi->cluster_size_bits);
340
341 num_subdirs = exfat_count_dir_entries(sb, &cdir);
342 if (num_subdirs < 0)
343 return -EIO;
344 set_nlink(inode, num_subdirs + EXFAT_MIN_SUBDIR);
345
346 inode->i_uid = sbi->options.fs_uid;
347 inode->i_gid = sbi->options.fs_gid;
348 inode_inc_iversion(inode);
349 inode->i_generation = 0;
350 inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, 0777);
351 inode->i_op = &exfat_dir_inode_operations;
352 inode->i_fop = &exfat_dir_operations;
353
354 inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1))
355 & ~(sbi->cluster_size - 1)) >> inode->i_blkbits;
356 EXFAT_I(inode)->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff;
357 EXFAT_I(inode)->i_size_aligned = i_size_read(inode);
358 EXFAT_I(inode)->i_size_ondisk = i_size_read(inode);
359
360 exfat_save_attr(inode, ATTR_SUBDIR);
361 inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime =
362 current_time(inode);
363 exfat_truncate_atime(&inode->i_atime);
364 exfat_cache_init_inode(inode);
365 return 0;
366 }
367
368 static struct pbr *exfat_read_pbr_with_logical_sector(struct super_block *sb)
369 {
370 struct exfat_sb_info *sbi = EXFAT_SB(sb);
371 struct pbr *p_pbr = (struct pbr *) (sbi->pbr_bh)->b_data;
372 unsigned short logical_sect = 0;
373
374 logical_sect = 1 << p_pbr->bsx.f64.sect_size_bits;
375
376 if (!is_power_of_2(logical_sect) ||
377 logical_sect < 512 || logical_sect > 4096) {
378 exfat_msg(sb, KERN_ERR, "bogus logical sector size %u",
379 logical_sect);
380 return NULL;
381 }
382
383 if (logical_sect < sb->s_blocksize) {
384 exfat_msg(sb, KERN_ERR,
385 "logical sector size too small for device (logical sector size = %u)",
386 logical_sect);
387 return NULL;
388 }
389
390 if (logical_sect > sb->s_blocksize) {
391 brelse(sbi->pbr_bh);
392 sbi->pbr_bh = NULL;
393
394 if (!sb_set_blocksize(sb, logical_sect)) {
395 exfat_msg(sb, KERN_ERR,
396 "unable to set blocksize %u", logical_sect);
397 return NULL;
398 }
399 sbi->pbr_bh = sb_bread(sb, 0);
400 if (!sbi->pbr_bh) {
401 exfat_msg(sb, KERN_ERR,
402 "unable to read boot sector (logical sector size = %lu)",
403 sb->s_blocksize);
404 return NULL;
405 }
406
407 p_pbr = (struct pbr *)sbi->pbr_bh->b_data;
408 }
409 return p_pbr;
410 }
411
412 /* mount the file system volume */
413 static int __exfat_fill_super(struct super_block *sb)
414 {
415 int ret;
416 struct pbr *p_pbr;
417 struct pbr64 *p_bpb;
418 struct exfat_sb_info *sbi = EXFAT_SB(sb);
419
420 /* set block size to read super block */
421 sb_min_blocksize(sb, 512);
422
423 /* read boot sector */
424 sbi->pbr_bh = sb_bread(sb, 0);
425 if (!sbi->pbr_bh) {
426 exfat_msg(sb, KERN_ERR, "unable to read boot sector");
427 return -EIO;
428 }
429
430 /* PRB is read */
431 p_pbr = (struct pbr *)sbi->pbr_bh->b_data;
432
433 /* check the validity of PBR */
434 if (le16_to_cpu((p_pbr->signature)) != PBR_SIGNATURE) {
435 exfat_msg(sb, KERN_ERR, "invalid boot record signature");
436 ret = -EINVAL;
437 goto free_bh;
438 }
439
440
441 /* check logical sector size */
442 p_pbr = exfat_read_pbr_with_logical_sector(sb);
443 if (!p_pbr) {
444 ret = -EIO;
445 goto free_bh;
446 }
447
448 /*
449 * res_zero field must be filled with zero to prevent mounting
450 * from FAT volume.
451 */
452 if (memchr_inv(p_pbr->bpb.f64.res_zero, 0,
453 sizeof(p_pbr->bpb.f64.res_zero))) {
454 ret = -EINVAL;
455 goto free_bh;
456 }
457
458 p_bpb = (struct pbr64 *)p_pbr;
459 if (!p_bpb->bsx.num_fats) {
460 exfat_msg(sb, KERN_ERR, "bogus number of FAT structure");
461 ret = -EINVAL;
462 goto free_bh;
463 }
464
465 sbi->sect_per_clus = 1 << p_bpb->bsx.sect_per_clus_bits;
466 sbi->sect_per_clus_bits = p_bpb->bsx.sect_per_clus_bits;
467 sbi->cluster_size_bits = sbi->sect_per_clus_bits + sb->s_blocksize_bits;
468 sbi->cluster_size = 1 << sbi->cluster_size_bits;
469 sbi->num_FAT_sectors = le32_to_cpu(p_bpb->bsx.fat_length);
470 sbi->FAT1_start_sector = le32_to_cpu(p_bpb->bsx.fat_offset);
471 sbi->FAT2_start_sector = p_bpb->bsx.num_fats == 1 ?
472 sbi->FAT1_start_sector :
473 sbi->FAT1_start_sector + sbi->num_FAT_sectors;
474 sbi->data_start_sector = le32_to_cpu(p_bpb->bsx.clu_offset);
475 sbi->num_sectors = le64_to_cpu(p_bpb->bsx.vol_length);
476 /* because the cluster index starts with 2 */
477 sbi->num_clusters = le32_to_cpu(p_bpb->bsx.clu_count) +
478 EXFAT_RESERVED_CLUSTERS;
479
480 sbi->root_dir = le32_to_cpu(p_bpb->bsx.root_cluster);
481 sbi->dentries_per_clu = 1 <<
482 (sbi->cluster_size_bits - DENTRY_SIZE_BITS);
483
484 sbi->vol_flag = le16_to_cpu(p_bpb->bsx.vol_flags);
485 sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER;
486 sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED;
487
488 if (le16_to_cpu(p_bpb->bsx.vol_flags) & VOL_DIRTY) {
489 sbi->vol_flag |= VOL_DIRTY;
490 exfat_msg(sb, KERN_WARNING,
491 "Volume was not properly unmounted. Some data may be corrupt. Please run fsck.");
492 }
493
494 /* exFAT file size is limited by a disk volume size */
495 sb->s_maxbytes = (u64)(sbi->num_clusters - EXFAT_RESERVED_CLUSTERS) <<
496 sbi->cluster_size_bits;
497
498 ret = exfat_create_upcase_table(sb);
499 if (ret) {
500 exfat_msg(sb, KERN_ERR, "failed to load upcase table");
501 goto free_bh;
502 }
503
504 ret = exfat_load_bitmap(sb);
505 if (ret) {
506 exfat_msg(sb, KERN_ERR, "failed to load alloc-bitmap");
507 goto free_upcase_table;
508 }
509
510 ret = exfat_count_used_clusters(sb, &sbi->used_clusters);
511 if (ret) {
512 exfat_msg(sb, KERN_ERR, "failed to scan clusters");
513 goto free_alloc_bitmap;
514 }
515
516 return 0;
517
518 free_alloc_bitmap:
519 exfat_free_bitmap(sbi);
520 free_upcase_table:
521 exfat_free_upcase_table(sbi);
522 free_bh:
523 brelse(sbi->pbr_bh);
524 return ret;
525 }
526
527 static int exfat_fill_super(struct super_block *sb, struct fs_context *fc)
528 {
529 struct exfat_sb_info *sbi = sb->s_fs_info;
530 struct exfat_mount_options *opts = &sbi->options;
531 struct inode *root_inode;
532 int err;
533
534 if (opts->allow_utime == (unsigned short)-1)
535 opts->allow_utime = ~opts->fs_dmask & 0022;
536
537 if (opts->discard) {
538 struct request_queue *q = bdev_get_queue(sb->s_bdev);
539
540 if (!blk_queue_discard(q)) {
541 exfat_msg(sb, KERN_WARNING,
542 "mounting with \"discard\" option, but the device does not support discard");
543 opts->discard = 0;
544 }
545 }
546
547 sb->s_flags |= SB_NODIRATIME;
548 sb->s_magic = EXFAT_SUPER_MAGIC;
549 sb->s_op = &exfat_sops;
550
551 sb->s_time_gran = 10 * NSEC_PER_MSEC;
552 sb->s_time_min = EXFAT_MIN_TIMESTAMP_SECS;
553 sb->s_time_max = EXFAT_MAX_TIMESTAMP_SECS;
554
555 err = __exfat_fill_super(sb);
556 if (err) {
557 exfat_msg(sb, KERN_ERR, "failed to recognize exfat type");
558 goto check_nls_io;
559 }
560
561 /* set up enough so that it can read an inode */
562 exfat_hash_init(sb);
563
564 if (!strcmp(sbi->options.iocharset, "utf8"))
565 opts->utf8 = 1;
566 else {
567 sbi->nls_io = load_nls(sbi->options.iocharset);
568 if (!sbi->nls_io) {
569 exfat_msg(sb, KERN_ERR, "IO charset %s not found",
570 sbi->options.iocharset);
571 err = -EINVAL;
572 goto free_table;
573 }
574 }
575
576 if (sbi->options.utf8)
577 sb->s_d_op = &exfat_utf8_dentry_ops;
578 else
579 sb->s_d_op = &exfat_dentry_ops;
580
581 root_inode = new_inode(sb);
582 if (!root_inode) {
583 exfat_msg(sb, KERN_ERR, "failed to allocate root inode.");
584 err = -ENOMEM;
585 goto free_table;
586 }
587
588 root_inode->i_ino = EXFAT_ROOT_INO;
589 inode_set_iversion(root_inode, 1);
590 err = exfat_read_root(root_inode);
591 if (err) {
592 exfat_msg(sb, KERN_ERR, "failed to initialize root inode.");
593 goto put_inode;
594 }
595
596 exfat_hash_inode(root_inode, EXFAT_I(root_inode)->i_pos);
597 insert_inode_hash(root_inode);
598
599 sb->s_root = d_make_root(root_inode);
600 if (!sb->s_root) {
601 exfat_msg(sb, KERN_ERR, "failed to get the root dentry");
602 err = -ENOMEM;
603 goto put_inode;
604 }
605
606 return 0;
607
608 put_inode:
609 iput(root_inode);
610 sb->s_root = NULL;
611
612 free_table:
613 exfat_free_upcase_table(sbi);
614 exfat_free_bitmap(sbi);
615 brelse(sbi->pbr_bh);
616
617 check_nls_io:
618 unload_nls(sbi->nls_io);
619 exfat_free_iocharset(sbi);
620 sb->s_fs_info = NULL;
621 kfree(sbi);
622 return err;
623 }
624
625 static int exfat_get_tree(struct fs_context *fc)
626 {
627 return get_tree_bdev(fc, exfat_fill_super);
628 }
629
630 static void exfat_free(struct fs_context *fc)
631 {
632 struct exfat_sb_info *sbi = fc->s_fs_info;
633
634 if (sbi) {
635 exfat_free_iocharset(sbi);
636 kfree(sbi);
637 }
638 }
639
640 static const struct fs_context_operations exfat_context_ops = {
641 .parse_param = exfat_parse_param,
642 .get_tree = exfat_get_tree,
643 .free = exfat_free,
644 };
645
646 static int exfat_init_fs_context(struct fs_context *fc)
647 {
648 struct exfat_sb_info *sbi;
649
650 sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL);
651 if (!sbi)
652 return -ENOMEM;
653
654 mutex_init(&sbi->s_lock);
655 ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL,
656 DEFAULT_RATELIMIT_BURST);
657
658 sbi->options.fs_uid = current_uid();
659 sbi->options.fs_gid = current_gid();
660 sbi->options.fs_fmask = current->fs->umask;
661 sbi->options.fs_dmask = current->fs->umask;
662 sbi->options.allow_utime = -1;
663 sbi->options.iocharset = exfat_default_iocharset;
664 sbi->options.errors = EXFAT_ERRORS_RO;
665
666 fc->s_fs_info = sbi;
667 fc->ops = &exfat_context_ops;
668 return 0;
669 }
670
671 static struct file_system_type exfat_fs_type = {
672 .owner = THIS_MODULE,
673 .name = "exfat",
674 .init_fs_context = exfat_init_fs_context,
675 .parameters = exfat_parameters,
676 .kill_sb = kill_block_super,
677 .fs_flags = FS_REQUIRES_DEV,
678 };
679
680 static void exfat_inode_init_once(void *foo)
681 {
682 struct exfat_inode_info *ei = (struct exfat_inode_info *)foo;
683
684 INIT_HLIST_NODE(&ei->i_hash_fat);
685 inode_init_once(&ei->vfs_inode);
686 }
687
688 static int __init init_exfat_fs(void)
689 {
690 int err;
691
692 err = exfat_cache_init();
693 if (err)
694 return err;
695
696 exfat_inode_cachep = kmem_cache_create("exfat_inode_cache",
697 sizeof(struct exfat_inode_info),
698 0, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
699 exfat_inode_init_once);
700 if (!exfat_inode_cachep) {
701 err = -ENOMEM;
702 goto shutdown_cache;
703 }
704
705 err = register_filesystem(&exfat_fs_type);
706 if (err)
707 goto destroy_cache;
708
709 return 0;
710
711 destroy_cache:
712 kmem_cache_destroy(exfat_inode_cachep);
713 shutdown_cache:
714 exfat_cache_shutdown();
715 return err;
716 }
717
718 static void __exit exit_exfat_fs(void)
719 {
720 /*
721 * Make sure all delayed rcu free inodes are flushed before we
722 * destroy cache.
723 */
724 rcu_barrier();
725 kmem_cache_destroy(exfat_inode_cachep);
726 unregister_filesystem(&exfat_fs_type);
727 exfat_cache_shutdown();
728 }
729
730 module_init(init_exfat_fs);
731 module_exit(exit_exfat_fs);
732
733 MODULE_ALIAS_FS("exfat");
734 MODULE_LICENSE("GPL");
735 MODULE_DESCRIPTION("exFAT filesystem support");
736 MODULE_AUTHOR("Samsung Electronics Co., Ltd.");
Linux with added FPC-III support