1
2
3
4
5
6#include <linux/module.h>
7#include <linux/buffer_head.h>
8#include <linux/statfs.h>
9#include <linux/parser.h>
10#include <linux/seq_file.h>
11#include <linux/crc32c.h>
12#include <linux/fs_context.h>
13#include <linux/fs_parser.h>
14#include <linux/dax.h>
15#include "xattr.h"
16
17#define CREATE_TRACE_POINTS
18#include <trace/events/erofs.h>
19
20static struct kmem_cache *erofs_inode_cachep __read_mostly;
21
22void _erofs_err(struct super_block *sb, const char *function,
23 const char *fmt, ...)
24{
25 struct va_format vaf;
26 va_list args;
27
28 va_start(args, fmt);
29
30 vaf.fmt = fmt;
31 vaf.va = &args;
32
33 pr_err("(device %s): %s: %pV", sb->s_id, function, &vaf);
34 va_end(args);
35}
36
37void _erofs_info(struct super_block *sb, const char *function,
38 const char *fmt, ...)
39{
40 struct va_format vaf;
41 va_list args;
42
43 va_start(args, fmt);
44
45 vaf.fmt = fmt;
46 vaf.va = &args;
47
48 pr_info("(device %s): %pV", sb->s_id, &vaf);
49 va_end(args);
50}
51
52static int erofs_superblock_csum_verify(struct super_block *sb, void *sbdata)
53{
54 struct erofs_super_block *dsb;
55 u32 expected_crc, crc;
56
57 dsb = kmemdup(sbdata + EROFS_SUPER_OFFSET,
58 EROFS_BLKSIZ - EROFS_SUPER_OFFSET, GFP_KERNEL);
59 if (!dsb)
60 return -ENOMEM;
61
62 expected_crc = le32_to_cpu(dsb->checksum);
63 dsb->checksum = 0;
64
65 crc = crc32c(~0, dsb, EROFS_BLKSIZ - EROFS_SUPER_OFFSET);
66 kfree(dsb);
67
68 if (crc != expected_crc) {
69 erofs_err(sb, "invalid checksum 0x%08x, 0x%08x expected",
70 crc, expected_crc);
71 return -EBADMSG;
72 }
73 return 0;
74}
75
76static void erofs_inode_init_once(void *ptr)
77{
78 struct erofs_inode *vi = ptr;
79
80 inode_init_once(&vi->vfs_inode);
81}
82
83static struct inode *erofs_alloc_inode(struct super_block *sb)
84{
85 struct erofs_inode *vi =
86 kmem_cache_alloc(erofs_inode_cachep, GFP_KERNEL);
87
88 if (!vi)
89 return NULL;
90
91
92 memset(vi, 0, offsetof(struct erofs_inode, vfs_inode));
93 return &vi->vfs_inode;
94}
95
96static void erofs_free_inode(struct inode *inode)
97{
98 struct erofs_inode *vi = EROFS_I(inode);
99
100
101 if (inode->i_op == &erofs_fast_symlink_iops)
102 kfree(inode->i_link);
103 kfree(vi->xattr_shared_xattrs);
104
105 kmem_cache_free(erofs_inode_cachep, vi);
106}
107
108static bool check_layout_compatibility(struct super_block *sb,
109 struct erofs_super_block *dsb)
110{
111 const unsigned int feature = le32_to_cpu(dsb->feature_incompat);
112
113 EROFS_SB(sb)->feature_incompat = feature;
114
115
116 if (feature & (~EROFS_ALL_FEATURE_INCOMPAT)) {
117 erofs_err(sb,
118 "unidentified incompatible feature %x, please upgrade kernel version",
119 feature & ~EROFS_ALL_FEATURE_INCOMPAT);
120 return false;
121 }
122 return true;
123}
124
125#ifdef CONFIG_EROFS_FS_ZIP
126
127static void *erofs_read_metadata(struct super_block *sb, struct page **pagep,
128 erofs_off_t *offset, int *lengthp)
129{
130 struct page *page = *pagep;
131 u8 *buffer, *ptr;
132 int len, i, cnt;
133 erofs_blk_t blk;
134
135 *offset = round_up(*offset, 4);
136 blk = erofs_blknr(*offset);
137
138 if (!page || page->index != blk) {
139 if (page) {
140 unlock_page(page);
141 put_page(page);
142 }
143 page = erofs_get_meta_page(sb, blk);
144 if (IS_ERR(page))
145 goto err_nullpage;
146 }
147
148 ptr = kmap(page);
149 len = le16_to_cpu(*(__le16 *)&ptr[erofs_blkoff(*offset)]);
150 if (!len)
151 len = U16_MAX + 1;
152 buffer = kmalloc(len, GFP_KERNEL);
153 if (!buffer) {
154 buffer = ERR_PTR(-ENOMEM);
155 goto out;
156 }
157 *offset += sizeof(__le16);
158 *lengthp = len;
159
160 for (i = 0; i < len; i += cnt) {
161 cnt = min(EROFS_BLKSIZ - (int)erofs_blkoff(*offset), len - i);
162 blk = erofs_blknr(*offset);
163
164 if (!page || page->index != blk) {
165 if (page) {
166 kunmap(page);
167 unlock_page(page);
168 put_page(page);
169 }
170 page = erofs_get_meta_page(sb, blk);
171 if (IS_ERR(page)) {
172 kfree(buffer);
173 goto err_nullpage;
174 }
175 ptr = kmap(page);
176 }
177 memcpy(buffer + i, ptr + erofs_blkoff(*offset), cnt);
178 *offset += cnt;
179 }
180out:
181 kunmap(page);
182 *pagep = page;
183 return buffer;
184err_nullpage:
185 *pagep = NULL;
186 return page;
187}
188
189static int erofs_load_compr_cfgs(struct super_block *sb,
190 struct erofs_super_block *dsb)
191{
192 struct erofs_sb_info *sbi;
193 struct page *page;
194 unsigned int algs, alg;
195 erofs_off_t offset;
196 int size, ret;
197
198 sbi = EROFS_SB(sb);
199 sbi->available_compr_algs = le16_to_cpu(dsb->u1.available_compr_algs);
200
201 if (sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS) {
202 erofs_err(sb, "try to load compressed fs with unsupported algorithms %x",
203 sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS);
204 return -EINVAL;
205 }
206
207 offset = EROFS_SUPER_OFFSET + sbi->sb_size;
208 page = NULL;
209 alg = 0;
210 ret = 0;
211
212 for (algs = sbi->available_compr_algs; algs; algs >>= 1, ++alg) {
213 void *data;
214
215 if (!(algs & 1))
216 continue;
217
218 data = erofs_read_metadata(sb, &page, &offset, &size);
219 if (IS_ERR(data)) {
220 ret = PTR_ERR(data);
221 goto err;
222 }
223
224 switch (alg) {
225 case Z_EROFS_COMPRESSION_LZ4:
226 ret = z_erofs_load_lz4_config(sb, dsb, data, size);
227 break;
228 default:
229 DBG_BUGON(1);
230 ret = -EFAULT;
231 }
232 kfree(data);
233 if (ret)
234 goto err;
235 }
236err:
237 if (page) {
238 unlock_page(page);
239 put_page(page);
240 }
241 return ret;
242}
243#else
244static int erofs_load_compr_cfgs(struct super_block *sb,
245 struct erofs_super_block *dsb)
246{
247 if (dsb->u1.available_compr_algs) {
248 erofs_err(sb, "try to load compressed fs when compression is disabled");
249 return -EINVAL;
250 }
251 return 0;
252}
253#endif
254
255static int erofs_read_superblock(struct super_block *sb)
256{
257 struct erofs_sb_info *sbi;
258 struct page *page;
259 struct erofs_super_block *dsb;
260 unsigned int blkszbits;
261 void *data;
262 int ret;
263
264 page = read_mapping_page(sb->s_bdev->bd_inode->i_mapping, 0, NULL);
265 if (IS_ERR(page)) {
266 erofs_err(sb, "cannot read erofs superblock");
267 return PTR_ERR(page);
268 }
269
270 sbi = EROFS_SB(sb);
271
272 data = kmap(page);
273 dsb = (struct erofs_super_block *)(data + EROFS_SUPER_OFFSET);
274
275 ret = -EINVAL;
276 if (le32_to_cpu(dsb->magic) != EROFS_SUPER_MAGIC_V1) {
277 erofs_err(sb, "cannot find valid erofs superblock");
278 goto out;
279 }
280
281 sbi->feature_compat = le32_to_cpu(dsb->feature_compat);
282 if (erofs_sb_has_sb_chksum(sbi)) {
283 ret = erofs_superblock_csum_verify(sb, data);
284 if (ret)
285 goto out;
286 }
287
288 ret = -EINVAL;
289 blkszbits = dsb->blkszbits;
290
291 if (blkszbits != LOG_BLOCK_SIZE) {
292 erofs_err(sb, "blkszbits %u isn't supported on this platform",
293 blkszbits);
294 goto out;
295 }
296
297 if (!check_layout_compatibility(sb, dsb))
298 goto out;
299
300 sbi->sb_size = 128 + dsb->sb_extslots * EROFS_SB_EXTSLOT_SIZE;
301 if (sbi->sb_size > EROFS_BLKSIZ) {
302 erofs_err(sb, "invalid sb_extslots %u (more than a fs block)",
303 sbi->sb_size);
304 goto out;
305 }
306 sbi->blocks = le32_to_cpu(dsb->blocks);
307 sbi->meta_blkaddr = le32_to_cpu(dsb->meta_blkaddr);
308#ifdef CONFIG_EROFS_FS_XATTR
309 sbi->xattr_blkaddr = le32_to_cpu(dsb->xattr_blkaddr);
310#endif
311 sbi->islotbits = ilog2(sizeof(struct erofs_inode_compact));
312 sbi->root_nid = le16_to_cpu(dsb->root_nid);
313 sbi->inos = le64_to_cpu(dsb->inos);
314
315 sbi->build_time = le64_to_cpu(dsb->build_time);
316 sbi->build_time_nsec = le32_to_cpu(dsb->build_time_nsec);
317
318 memcpy(&sb->s_uuid, dsb->uuid, sizeof(dsb->uuid));
319
320 ret = strscpy(sbi->volume_name, dsb->volume_name,
321 sizeof(dsb->volume_name));
322 if (ret < 0) {
323 erofs_err(sb, "bad volume name without NIL terminator");
324 ret = -EFSCORRUPTED;
325 goto out;
326 }
327
328
329 if (erofs_sb_has_compr_cfgs(sbi))
330 ret = erofs_load_compr_cfgs(sb, dsb);
331 else
332 ret = z_erofs_load_lz4_config(sb, dsb, NULL, 0);
333out:
334 kunmap(page);
335 put_page(page);
336 return ret;
337}
338
339
340static void erofs_default_options(struct erofs_fs_context *ctx)
341{
342#ifdef CONFIG_EROFS_FS_ZIP
343 ctx->cache_strategy = EROFS_ZIP_CACHE_READAROUND;
344 ctx->max_sync_decompress_pages = 3;
345 ctx->readahead_sync_decompress = false;
346#endif
347#ifdef CONFIG_EROFS_FS_XATTR
348 set_opt(ctx, XATTR_USER);
349#endif
350#ifdef CONFIG_EROFS_FS_POSIX_ACL
351 set_opt(ctx, POSIX_ACL);
352#endif
353}
354
355enum {
356 Opt_user_xattr,
357 Opt_acl,
358 Opt_cache_strategy,
359 Opt_dax,
360 Opt_dax_enum,
361 Opt_err
362};
363
364static const struct constant_table erofs_param_cache_strategy[] = {
365 {"disabled", EROFS_ZIP_CACHE_DISABLED},
366 {"readahead", EROFS_ZIP_CACHE_READAHEAD},
367 {"readaround", EROFS_ZIP_CACHE_READAROUND},
368 {}
369};
370
371static const struct constant_table erofs_dax_param_enums[] = {
372 {"always", EROFS_MOUNT_DAX_ALWAYS},
373 {"never", EROFS_MOUNT_DAX_NEVER},
374 {}
375};
376
377static const struct fs_parameter_spec erofs_fs_parameters[] = {
378 fsparam_flag_no("user_xattr", Opt_user_xattr),
379 fsparam_flag_no("acl", Opt_acl),
380 fsparam_enum("cache_strategy", Opt_cache_strategy,
381 erofs_param_cache_strategy),
382 fsparam_flag("dax", Opt_dax),
383 fsparam_enum("dax", Opt_dax_enum, erofs_dax_param_enums),
384 {}
385};
386
387static bool erofs_fc_set_dax_mode(struct fs_context *fc, unsigned int mode)
388{
389#ifdef CONFIG_FS_DAX
390 struct erofs_fs_context *ctx = fc->fs_private;
391
392 switch (mode) {
393 case EROFS_MOUNT_DAX_ALWAYS:
394 warnfc(fc, "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
395 set_opt(ctx, DAX_ALWAYS);
396 clear_opt(ctx, DAX_NEVER);
397 return true;
398 case EROFS_MOUNT_DAX_NEVER:
399 set_opt(ctx, DAX_NEVER);
400 clear_opt(ctx, DAX_ALWAYS);
401 return true;
402 default:
403 DBG_BUGON(1);
404 return false;
405 }
406#else
407 errorfc(fc, "dax options not supported");
408 return false;
409#endif
410}
411
412static int erofs_fc_parse_param(struct fs_context *fc,
413 struct fs_parameter *param)
414{
415 struct erofs_fs_context *ctx __maybe_unused = fc->fs_private;
416 struct fs_parse_result result;
417 int opt;
418
419 opt = fs_parse(fc, erofs_fs_parameters, param, &result);
420 if (opt < 0)
421 return opt;
422
423 switch (opt) {
424 case Opt_user_xattr:
425#ifdef CONFIG_EROFS_FS_XATTR
426 if (result.boolean)
427 set_opt(ctx, XATTR_USER);
428 else
429 clear_opt(ctx, XATTR_USER);
430#else
431 errorfc(fc, "{,no}user_xattr options not supported");
432#endif
433 break;
434 case Opt_acl:
435#ifdef CONFIG_EROFS_FS_POSIX_ACL
436 if (result.boolean)
437 set_opt(ctx, POSIX_ACL);
438 else
439 clear_opt(ctx, POSIX_ACL);
440#else
441 errorfc(fc, "{,no}acl options not supported");
442#endif
443 break;
444 case Opt_cache_strategy:
445#ifdef CONFIG_EROFS_FS_ZIP
446 ctx->cache_strategy = result.uint_32;
447#else
448 errorfc(fc, "compression not supported, cache_strategy ignored");
449#endif
450 break;
451 case Opt_dax:
452 if (!erofs_fc_set_dax_mode(fc, EROFS_MOUNT_DAX_ALWAYS))
453 return -EINVAL;
454 break;
455 case Opt_dax_enum:
456 if (!erofs_fc_set_dax_mode(fc, result.uint_32))
457 return -EINVAL;
458 break;
459 default:
460 return -ENOPARAM;
461 }
462 return 0;
463}
464
465#ifdef CONFIG_EROFS_FS_ZIP
466static const struct address_space_operations managed_cache_aops;
467
468static int erofs_managed_cache_releasepage(struct page *page, gfp_t gfp_mask)
469{
470 int ret = 1;
471 struct address_space *const mapping = page->mapping;
472
473 DBG_BUGON(!PageLocked(page));
474 DBG_BUGON(mapping->a_ops != &managed_cache_aops);
475
476 if (PagePrivate(page))
477 ret = erofs_try_to_free_cached_page(page);
478
479 return ret;
480}
481
482static void erofs_managed_cache_invalidatepage(struct page *page,
483 unsigned int offset,
484 unsigned int length)
485{
486 const unsigned int stop = length + offset;
487
488 DBG_BUGON(!PageLocked(page));
489
490
491 DBG_BUGON(stop > PAGE_SIZE || stop < length);
492
493 if (offset == 0 && stop == PAGE_SIZE)
494 while (!erofs_managed_cache_releasepage(page, GFP_NOFS))
495 cond_resched();
496}
497
498static const struct address_space_operations managed_cache_aops = {
499 .releasepage = erofs_managed_cache_releasepage,
500 .invalidatepage = erofs_managed_cache_invalidatepage,
501};
502
503static int erofs_init_managed_cache(struct super_block *sb)
504{
505 struct erofs_sb_info *const sbi = EROFS_SB(sb);
506 struct inode *const inode = new_inode(sb);
507
508 if (!inode)
509 return -ENOMEM;
510
511 set_nlink(inode, 1);
512 inode->i_size = OFFSET_MAX;
513
514 inode->i_mapping->a_ops = &managed_cache_aops;
515 mapping_set_gfp_mask(inode->i_mapping,
516 GFP_NOFS | __GFP_HIGHMEM | __GFP_MOVABLE);
517 sbi->managed_cache = inode;
518 return 0;
519}
520#else
521static int erofs_init_managed_cache(struct super_block *sb) { return 0; }
522#endif
523
524static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
525{
526 struct inode *inode;
527 struct erofs_sb_info *sbi;
528 struct erofs_fs_context *ctx = fc->fs_private;
529 int err;
530
531 sb->s_magic = EROFS_SUPER_MAGIC;
532
533 if (!sb_set_blocksize(sb, EROFS_BLKSIZ)) {
534 erofs_err(sb, "failed to set erofs blksize");
535 return -EINVAL;
536 }
537
538 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
539 if (!sbi)
540 return -ENOMEM;
541
542 sb->s_fs_info = sbi;
543 sbi->dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
544 err = erofs_read_superblock(sb);
545 if (err)
546 return err;
547
548 if (test_opt(ctx, DAX_ALWAYS) &&
549 !dax_supported(sbi->dax_dev, sb->s_bdev, EROFS_BLKSIZ, 0, bdev_nr_sectors(sb->s_bdev))) {
550 errorfc(fc, "DAX unsupported by block device. Turning off DAX.");
551 clear_opt(ctx, DAX_ALWAYS);
552 }
553 sb->s_flags |= SB_RDONLY | SB_NOATIME;
554 sb->s_maxbytes = MAX_LFS_FILESIZE;
555 sb->s_time_gran = 1;
556
557 sb->s_op = &erofs_sops;
558 sb->s_xattr = erofs_xattr_handlers;
559
560 if (test_opt(ctx, POSIX_ACL))
561 sb->s_flags |= SB_POSIXACL;
562 else
563 sb->s_flags &= ~SB_POSIXACL;
564
565 sbi->ctx = *ctx;
566
567#ifdef CONFIG_EROFS_FS_ZIP
568 xa_init(&sbi->managed_pslots);
569#endif
570
571
572 inode = erofs_iget(sb, ROOT_NID(sbi), true);
573 if (IS_ERR(inode))
574 return PTR_ERR(inode);
575
576 if (!S_ISDIR(inode->i_mode)) {
577 erofs_err(sb, "rootino(nid %llu) is not a directory(i_mode %o)",
578 ROOT_NID(sbi), inode->i_mode);
579 iput(inode);
580 return -EINVAL;
581 }
582
583 sb->s_root = d_make_root(inode);
584 if (!sb->s_root)
585 return -ENOMEM;
586
587 erofs_shrinker_register(sb);
588
589 err = erofs_init_managed_cache(sb);
590 if (err)
591 return err;
592
593 erofs_info(sb, "mounted with root inode @ nid %llu.", ROOT_NID(sbi));
594 return 0;
595}
596
597static int erofs_fc_get_tree(struct fs_context *fc)
598{
599 return get_tree_bdev(fc, erofs_fc_fill_super);
600}
601
602static int erofs_fc_reconfigure(struct fs_context *fc)
603{
604 struct super_block *sb = fc->root->d_sb;
605 struct erofs_sb_info *sbi = EROFS_SB(sb);
606 struct erofs_fs_context *ctx = fc->fs_private;
607
608 DBG_BUGON(!sb_rdonly(sb));
609
610 if (test_opt(ctx, POSIX_ACL))
611 fc->sb_flags |= SB_POSIXACL;
612 else
613 fc->sb_flags &= ~SB_POSIXACL;
614
615 sbi->ctx = *ctx;
616
617 fc->sb_flags |= SB_RDONLY;
618 return 0;
619}
620
621static void erofs_fc_free(struct fs_context *fc)
622{
623 kfree(fc->fs_private);
624}
625
626static const struct fs_context_operations erofs_context_ops = {
627 .parse_param = erofs_fc_parse_param,
628 .get_tree = erofs_fc_get_tree,
629 .reconfigure = erofs_fc_reconfigure,
630 .free = erofs_fc_free,
631};
632
633static int erofs_init_fs_context(struct fs_context *fc)
634{
635 fc->fs_private = kzalloc(sizeof(struct erofs_fs_context), GFP_KERNEL);
636 if (!fc->fs_private)
637 return -ENOMEM;
638
639
640 erofs_default_options(fc->fs_private);
641
642 fc->ops = &erofs_context_ops;
643
644 return 0;
645}
646
647
648
649
650
651static void erofs_kill_sb(struct super_block *sb)
652{
653 struct erofs_sb_info *sbi;
654
655 WARN_ON(sb->s_magic != EROFS_SUPER_MAGIC);
656
657 kill_block_super(sb);
658
659 sbi = EROFS_SB(sb);
660 if (!sbi)
661 return;
662 fs_put_dax(sbi->dax_dev);
663 kfree(sbi);
664 sb->s_fs_info = NULL;
665}
666
667
668static void erofs_put_super(struct super_block *sb)
669{
670 struct erofs_sb_info *const sbi = EROFS_SB(sb);
671
672 DBG_BUGON(!sbi);
673
674 erofs_shrinker_unregister(sb);
675#ifdef CONFIG_EROFS_FS_ZIP
676 iput(sbi->managed_cache);
677 sbi->managed_cache = NULL;
678#endif
679}
680
681static struct file_system_type erofs_fs_type = {
682 .owner = THIS_MODULE,
683 .name = "erofs",
684 .init_fs_context = erofs_init_fs_context,
685 .kill_sb = erofs_kill_sb,
686 .fs_flags = FS_REQUIRES_DEV,
687};
688MODULE_ALIAS_FS("erofs");
689
690static int __init erofs_module_init(void)
691{
692 int err;
693
694 erofs_check_ondisk_layout_definitions();
695
696 erofs_inode_cachep = kmem_cache_create("erofs_inode",
697 sizeof(struct erofs_inode), 0,
698 SLAB_RECLAIM_ACCOUNT,
699 erofs_inode_init_once);
700 if (!erofs_inode_cachep) {
701 err = -ENOMEM;
702 goto icache_err;
703 }
704
705 err = erofs_init_shrinker();
706 if (err)
707 goto shrinker_err;
708
709 erofs_pcpubuf_init();
710 err = z_erofs_init_zip_subsystem();
711 if (err)
712 goto zip_err;
713
714 err = register_filesystem(&erofs_fs_type);
715 if (err)
716 goto fs_err;
717
718 return 0;
719
720fs_err:
721 z_erofs_exit_zip_subsystem();
722zip_err:
723 erofs_exit_shrinker();
724shrinker_err:
725 kmem_cache_destroy(erofs_inode_cachep);
726icache_err:
727 return err;
728}
729
730static void __exit erofs_module_exit(void)
731{
732 unregister_filesystem(&erofs_fs_type);
733 z_erofs_exit_zip_subsystem();
734 erofs_exit_shrinker();
735
736
737 rcu_barrier();
738 kmem_cache_destroy(erofs_inode_cachep);
739 erofs_pcpubuf_exit();
740}
741
742
743static int erofs_statfs(struct dentry *dentry, struct kstatfs *buf)
744{
745 struct super_block *sb = dentry->d_sb;
746 struct erofs_sb_info *sbi = EROFS_SB(sb);
747 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
748
749 buf->f_type = sb->s_magic;
750 buf->f_bsize = EROFS_BLKSIZ;
751 buf->f_blocks = sbi->blocks;
752 buf->f_bfree = buf->f_bavail = 0;
753
754 buf->f_files = ULLONG_MAX;
755 buf->f_ffree = ULLONG_MAX - sbi->inos;
756
757 buf->f_namelen = EROFS_NAME_LEN;
758
759 buf->f_fsid = u64_to_fsid(id);
760 return 0;
761}
762
763static int erofs_show_options(struct seq_file *seq, struct dentry *root)
764{
765 struct erofs_sb_info *sbi = EROFS_SB(root->d_sb);
766 struct erofs_fs_context *ctx = &sbi->ctx;
767
768#ifdef CONFIG_EROFS_FS_XATTR
769 if (test_opt(ctx, XATTR_USER))
770 seq_puts(seq, ",user_xattr");
771 else
772 seq_puts(seq, ",nouser_xattr");
773#endif
774#ifdef CONFIG_EROFS_FS_POSIX_ACL
775 if (test_opt(ctx, POSIX_ACL))
776 seq_puts(seq, ",acl");
777 else
778 seq_puts(seq, ",noacl");
779#endif
780#ifdef CONFIG_EROFS_FS_ZIP
781 if (ctx->cache_strategy == EROFS_ZIP_CACHE_DISABLED)
782 seq_puts(seq, ",cache_strategy=disabled");
783 else if (ctx->cache_strategy == EROFS_ZIP_CACHE_READAHEAD)
784 seq_puts(seq, ",cache_strategy=readahead");
785 else if (ctx->cache_strategy == EROFS_ZIP_CACHE_READAROUND)
786 seq_puts(seq, ",cache_strategy=readaround");
787#endif
788 if (test_opt(ctx, DAX_ALWAYS))
789 seq_puts(seq, ",dax=always");
790 if (test_opt(ctx, DAX_NEVER))
791 seq_puts(seq, ",dax=never");
792 return 0;
793}
794
795const struct super_operations erofs_sops = {
796 .put_super = erofs_put_super,
797 .alloc_inode = erofs_alloc_inode,
798 .free_inode = erofs_free_inode,
799 .statfs = erofs_statfs,
800 .show_options = erofs_show_options,
801};
802
803module_init(erofs_module_init);
804module_exit(erofs_module_exit);
805
806MODULE_DESCRIPTION("Enhanced ROM File System");
807MODULE_AUTHOR("Gao Xiang, Chao Yu, Miao Xie, CONSUMER BG, HUAWEI Inc.");
808MODULE_LICENSE("GPL");
809
