1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2017-2018 HUAWEI, Inc.
4 * https://www.huawei.com/
5 * Copyright (C) 2021, Alibaba Cloud
7 #include <linux/statfs.h>
8 #include <linux/seq_file.h>
9 #include <linux/crc32c.h>
10 #include <linux/fs_context.h>
11 #include <linux/fs_parser.h>
12 #include <linux/exportfs.h>
15 #define CREATE_TRACE_POINTS
16 #include <trace/events/erofs.h>
18 static struct kmem_cache *erofs_inode_cachep __read_mostly;
20 void _erofs_err(struct super_block *sb, const char *func, const char *fmt, ...)
30 pr_err("(device %s): %s: %pV", sb->s_id, func, &vaf);
34 void _erofs_info(struct super_block *sb, const char *func, const char *fmt, ...)
44 pr_info("(device %s): %pV", sb->s_id, &vaf);
48 static int erofs_superblock_csum_verify(struct super_block *sb, void *sbdata)
50 size_t len = 1 << EROFS_SB(sb)->blkszbits;
51 struct erofs_super_block *dsb;
52 u32 expected_crc, crc;
54 if (len > EROFS_SUPER_OFFSET)
55 len -= EROFS_SUPER_OFFSET;
57 dsb = kmemdup(sbdata + EROFS_SUPER_OFFSET, len, GFP_KERNEL);
61 expected_crc = le32_to_cpu(dsb->checksum);
63 /* to allow for x86 boot sectors and other oddities. */
64 crc = crc32c(~0, dsb, len);
67 if (crc != expected_crc) {
68 erofs_err(sb, "invalid checksum 0x%08x, 0x%08x expected",
75 static void erofs_inode_init_once(void *ptr)
77 struct erofs_inode *vi = ptr;
79 inode_init_once(&vi->vfs_inode);
82 static struct inode *erofs_alloc_inode(struct super_block *sb)
84 struct erofs_inode *vi =
85 alloc_inode_sb(sb, erofs_inode_cachep, GFP_KERNEL);
90 /* zero out everything except vfs_inode */
91 memset(vi, 0, offsetof(struct erofs_inode, vfs_inode));
92 return &vi->vfs_inode;
95 static void erofs_free_inode(struct inode *inode)
97 struct erofs_inode *vi = EROFS_I(inode);
99 if (inode->i_op == &erofs_fast_symlink_iops)
100 kfree(inode->i_link);
101 kfree(vi->xattr_shared_xattrs);
102 kmem_cache_free(erofs_inode_cachep, vi);
105 static bool check_layout_compatibility(struct super_block *sb,
106 struct erofs_super_block *dsb)
108 const unsigned int feature = le32_to_cpu(dsb->feature_incompat);
110 EROFS_SB(sb)->feature_incompat = feature;
112 /* check if current kernel meets all mandatory requirements */
113 if (feature & (~EROFS_ALL_FEATURE_INCOMPAT)) {
114 erofs_err(sb, "unidentified incompatible feature %x, please upgrade kernel",
115 feature & ~EROFS_ALL_FEATURE_INCOMPAT);
121 /* read variable-sized metadata, offset will be aligned by 4-byte */
122 void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
123 erofs_off_t *offset, int *lengthp)
128 *offset = round_up(*offset, 4);
129 ptr = erofs_bread(buf, erofs_blknr(sb, *offset), EROFS_KMAP);
133 len = le16_to_cpu(*(__le16 *)&ptr[erofs_blkoff(sb, *offset)]);
136 buffer = kmalloc(len, GFP_KERNEL);
138 return ERR_PTR(-ENOMEM);
139 *offset += sizeof(__le16);
142 for (i = 0; i < len; i += cnt) {
143 cnt = min_t(int, sb->s_blocksize - erofs_blkoff(sb, *offset),
145 ptr = erofs_bread(buf, erofs_blknr(sb, *offset), EROFS_KMAP);
150 memcpy(buffer + i, ptr + erofs_blkoff(sb, *offset), cnt);
156 #ifndef CONFIG_EROFS_FS_ZIP
157 static int z_erofs_parse_cfgs(struct super_block *sb,
158 struct erofs_super_block *dsb)
160 if (!dsb->u1.available_compr_algs)
163 erofs_err(sb, "compression disabled, unable to mount compressed EROFS");
168 static int erofs_init_device(struct erofs_buf *buf, struct super_block *sb,
169 struct erofs_device_info *dif, erofs_off_t *pos)
171 struct erofs_sb_info *sbi = EROFS_SB(sb);
172 struct erofs_fscache *fscache;
173 struct erofs_deviceslot *dis;
174 struct bdev_handle *bdev_handle;
177 ptr = erofs_read_metabuf(buf, sb, erofs_blknr(sb, *pos), EROFS_KMAP);
180 dis = ptr + erofs_blkoff(sb, *pos);
182 if (!sbi->devs->flatdev && !dif->path) {
184 erofs_err(sb, "empty device tag @ pos %llu", *pos);
187 dif->path = kmemdup_nul(dis->tag, sizeof(dis->tag), GFP_KERNEL);
192 if (erofs_is_fscache_mode(sb)) {
193 fscache = erofs_fscache_register_cookie(sb, dif->path, 0);
195 return PTR_ERR(fscache);
196 dif->fscache = fscache;
197 } else if (!sbi->devs->flatdev) {
198 bdev_handle = bdev_open_by_path(dif->path, BLK_OPEN_READ,
200 if (IS_ERR(bdev_handle))
201 return PTR_ERR(bdev_handle);
202 dif->bdev_handle = bdev_handle;
203 dif->dax_dev = fs_dax_get_by_bdev(bdev_handle->bdev,
204 &dif->dax_part_off, NULL, NULL);
207 dif->blocks = le32_to_cpu(dis->blocks);
208 dif->mapped_blkaddr = le32_to_cpu(dis->mapped_blkaddr);
209 sbi->total_blocks += dif->blocks;
210 *pos += EROFS_DEVT_SLOT_SIZE;
214 static int erofs_scan_devices(struct super_block *sb,
215 struct erofs_super_block *dsb)
217 struct erofs_sb_info *sbi = EROFS_SB(sb);
218 unsigned int ondisk_extradevs;
220 struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
221 struct erofs_device_info *dif;
224 sbi->total_blocks = sbi->primarydevice_blocks;
225 if (!erofs_sb_has_device_table(sbi))
226 ondisk_extradevs = 0;
228 ondisk_extradevs = le16_to_cpu(dsb->extra_devices);
230 if (sbi->devs->extra_devices &&
231 ondisk_extradevs != sbi->devs->extra_devices) {
232 erofs_err(sb, "extra devices don't match (ondisk %u, given %u)",
233 ondisk_extradevs, sbi->devs->extra_devices);
236 if (!ondisk_extradevs)
239 if (!sbi->devs->extra_devices && !erofs_is_fscache_mode(sb))
240 sbi->devs->flatdev = true;
242 sbi->device_id_mask = roundup_pow_of_two(ondisk_extradevs + 1) - 1;
243 pos = le16_to_cpu(dsb->devt_slotoff) * EROFS_DEVT_SLOT_SIZE;
244 down_read(&sbi->devs->rwsem);
245 if (sbi->devs->extra_devices) {
246 idr_for_each_entry(&sbi->devs->tree, dif, id) {
247 err = erofs_init_device(&buf, sb, dif, &pos);
252 for (id = 0; id < ondisk_extradevs; id++) {
253 dif = kzalloc(sizeof(*dif), GFP_KERNEL);
259 err = idr_alloc(&sbi->devs->tree, dif, 0, 0, GFP_KERNEL);
264 ++sbi->devs->extra_devices;
266 err = erofs_init_device(&buf, sb, dif, &pos);
271 up_read(&sbi->devs->rwsem);
272 erofs_put_metabuf(&buf);
276 static int erofs_read_superblock(struct super_block *sb)
278 struct erofs_sb_info *sbi;
279 struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
280 struct erofs_super_block *dsb;
284 data = erofs_read_metabuf(&buf, sb, 0, EROFS_KMAP);
286 erofs_err(sb, "cannot read erofs superblock");
287 return PTR_ERR(data);
291 dsb = (struct erofs_super_block *)(data + EROFS_SUPER_OFFSET);
294 if (le32_to_cpu(dsb->magic) != EROFS_SUPER_MAGIC_V1) {
295 erofs_err(sb, "cannot find valid erofs superblock");
299 sbi->blkszbits = dsb->blkszbits;
300 if (sbi->blkszbits < 9 || sbi->blkszbits > PAGE_SHIFT) {
301 erofs_err(sb, "blkszbits %u isn't supported", sbi->blkszbits);
304 if (dsb->dirblkbits) {
305 erofs_err(sb, "dirblkbits %u isn't supported", dsb->dirblkbits);
309 sbi->feature_compat = le32_to_cpu(dsb->feature_compat);
310 if (erofs_sb_has_sb_chksum(sbi)) {
311 ret = erofs_superblock_csum_verify(sb, data);
317 if (!check_layout_compatibility(sb, dsb))
320 sbi->sb_size = 128 + dsb->sb_extslots * EROFS_SB_EXTSLOT_SIZE;
321 if (sbi->sb_size > PAGE_SIZE - EROFS_SUPER_OFFSET) {
322 erofs_err(sb, "invalid sb_extslots %u (more than a fs block)",
326 sbi->primarydevice_blocks = le32_to_cpu(dsb->blocks);
327 sbi->meta_blkaddr = le32_to_cpu(dsb->meta_blkaddr);
328 #ifdef CONFIG_EROFS_FS_XATTR
329 sbi->xattr_blkaddr = le32_to_cpu(dsb->xattr_blkaddr);
330 sbi->xattr_prefix_start = le32_to_cpu(dsb->xattr_prefix_start);
331 sbi->xattr_prefix_count = dsb->xattr_prefix_count;
332 sbi->xattr_filter_reserved = dsb->xattr_filter_reserved;
334 sbi->islotbits = ilog2(sizeof(struct erofs_inode_compact));
335 sbi->root_nid = le16_to_cpu(dsb->root_nid);
336 sbi->packed_nid = le64_to_cpu(dsb->packed_nid);
337 sbi->inos = le64_to_cpu(dsb->inos);
339 sbi->build_time = le64_to_cpu(dsb->build_time);
340 sbi->build_time_nsec = le32_to_cpu(dsb->build_time_nsec);
342 memcpy(&sb->s_uuid, dsb->uuid, sizeof(dsb->uuid));
344 ret = strscpy(sbi->volume_name, dsb->volume_name,
345 sizeof(dsb->volume_name));
346 if (ret < 0) { /* -E2BIG */
347 erofs_err(sb, "bad volume name without NIL terminator");
352 /* parse on-disk compression configurations */
353 ret = z_erofs_parse_cfgs(sb, dsb);
357 /* handle multiple devices */
358 ret = erofs_scan_devices(sb, dsb);
360 if (erofs_is_fscache_mode(sb))
361 erofs_info(sb, "EXPERIMENTAL fscache-based on-demand read feature in use. Use at your own risk!");
363 erofs_put_metabuf(&buf);
367 static void erofs_default_options(struct erofs_fs_context *ctx)
369 #ifdef CONFIG_EROFS_FS_ZIP
370 ctx->opt.cache_strategy = EROFS_ZIP_CACHE_READAROUND;
371 ctx->opt.max_sync_decompress_pages = 3;
372 ctx->opt.sync_decompress = EROFS_SYNC_DECOMPRESS_AUTO;
374 #ifdef CONFIG_EROFS_FS_XATTR
375 set_opt(&ctx->opt, XATTR_USER);
377 #ifdef CONFIG_EROFS_FS_POSIX_ACL
378 set_opt(&ctx->opt, POSIX_ACL);
394 static const struct constant_table erofs_param_cache_strategy[] = {
395 {"disabled", EROFS_ZIP_CACHE_DISABLED},
396 {"readahead", EROFS_ZIP_CACHE_READAHEAD},
397 {"readaround", EROFS_ZIP_CACHE_READAROUND},
401 static const struct constant_table erofs_dax_param_enums[] = {
402 {"always", EROFS_MOUNT_DAX_ALWAYS},
403 {"never", EROFS_MOUNT_DAX_NEVER},
407 static const struct fs_parameter_spec erofs_fs_parameters[] = {
408 fsparam_flag_no("user_xattr", Opt_user_xattr),
409 fsparam_flag_no("acl", Opt_acl),
410 fsparam_enum("cache_strategy", Opt_cache_strategy,
411 erofs_param_cache_strategy),
412 fsparam_flag("dax", Opt_dax),
413 fsparam_enum("dax", Opt_dax_enum, erofs_dax_param_enums),
414 fsparam_string("device", Opt_device),
415 fsparam_string("fsid", Opt_fsid),
416 fsparam_string("domain_id", Opt_domain_id),
420 static bool erofs_fc_set_dax_mode(struct fs_context *fc, unsigned int mode)
423 struct erofs_fs_context *ctx = fc->fs_private;
426 case EROFS_MOUNT_DAX_ALWAYS:
427 warnfc(fc, "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
428 set_opt(&ctx->opt, DAX_ALWAYS);
429 clear_opt(&ctx->opt, DAX_NEVER);
431 case EROFS_MOUNT_DAX_NEVER:
432 set_opt(&ctx->opt, DAX_NEVER);
433 clear_opt(&ctx->opt, DAX_ALWAYS);
440 errorfc(fc, "dax options not supported");
445 static int erofs_fc_parse_param(struct fs_context *fc,
446 struct fs_parameter *param)
448 struct erofs_fs_context *ctx = fc->fs_private;
449 struct fs_parse_result result;
450 struct erofs_device_info *dif;
453 opt = fs_parse(fc, erofs_fs_parameters, param, &result);
459 #ifdef CONFIG_EROFS_FS_XATTR
461 set_opt(&ctx->opt, XATTR_USER);
463 clear_opt(&ctx->opt, XATTR_USER);
465 errorfc(fc, "{,no}user_xattr options not supported");
469 #ifdef CONFIG_EROFS_FS_POSIX_ACL
471 set_opt(&ctx->opt, POSIX_ACL);
473 clear_opt(&ctx->opt, POSIX_ACL);
475 errorfc(fc, "{,no}acl options not supported");
478 case Opt_cache_strategy:
479 #ifdef CONFIG_EROFS_FS_ZIP
480 ctx->opt.cache_strategy = result.uint_32;
482 errorfc(fc, "compression not supported, cache_strategy ignored");
486 if (!erofs_fc_set_dax_mode(fc, EROFS_MOUNT_DAX_ALWAYS))
490 if (!erofs_fc_set_dax_mode(fc, result.uint_32))
494 dif = kzalloc(sizeof(*dif), GFP_KERNEL);
497 dif->path = kstrdup(param->string, GFP_KERNEL);
502 down_write(&ctx->devs->rwsem);
503 ret = idr_alloc(&ctx->devs->tree, dif, 0, 0, GFP_KERNEL);
504 up_write(&ctx->devs->rwsem);
510 ++ctx->devs->extra_devices;
512 #ifdef CONFIG_EROFS_FS_ONDEMAND
515 ctx->fsid = kstrdup(param->string, GFP_KERNEL);
520 kfree(ctx->domain_id);
521 ctx->domain_id = kstrdup(param->string, GFP_KERNEL);
528 errorfc(fc, "%s option not supported", erofs_fs_parameters[opt].name);
537 static struct inode *erofs_nfs_get_inode(struct super_block *sb,
538 u64 ino, u32 generation)
540 return erofs_iget(sb, ino);
543 static struct dentry *erofs_fh_to_dentry(struct super_block *sb,
544 struct fid *fid, int fh_len, int fh_type)
546 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
547 erofs_nfs_get_inode);
550 static struct dentry *erofs_fh_to_parent(struct super_block *sb,
551 struct fid *fid, int fh_len, int fh_type)
553 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
554 erofs_nfs_get_inode);
557 static struct dentry *erofs_get_parent(struct dentry *child)
563 err = erofs_namei(d_inode(child), &dotdot_name, &nid, &d_type);
566 return d_obtain_alias(erofs_iget(child->d_sb, nid));
569 static const struct export_operations erofs_export_ops = {
570 .encode_fh = generic_encode_ino32_fh,
571 .fh_to_dentry = erofs_fh_to_dentry,
572 .fh_to_parent = erofs_fh_to_parent,
573 .get_parent = erofs_get_parent,
576 static int erofs_fc_fill_pseudo_super(struct super_block *sb, struct fs_context *fc)
578 static const struct tree_descr empty_descr = {""};
580 return simple_fill_super(sb, EROFS_SUPER_MAGIC, &empty_descr);
583 static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
586 struct erofs_sb_info *sbi;
587 struct erofs_fs_context *ctx = fc->fs_private;
590 sb->s_magic = EROFS_SUPER_MAGIC;
591 sb->s_flags |= SB_RDONLY | SB_NOATIME;
592 sb->s_maxbytes = MAX_LFS_FILESIZE;
593 sb->s_op = &erofs_sops;
595 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
601 sbi->devs = ctx->devs;
603 sbi->fsid = ctx->fsid;
605 sbi->domain_id = ctx->domain_id;
606 ctx->domain_id = NULL;
608 sbi->blkszbits = PAGE_SHIFT;
609 if (erofs_is_fscache_mode(sb)) {
610 sb->s_blocksize = PAGE_SIZE;
611 sb->s_blocksize_bits = PAGE_SHIFT;
613 err = erofs_fscache_register_fs(sb);
617 err = super_setup_bdi(sb);
621 if (!sb_set_blocksize(sb, PAGE_SIZE)) {
622 errorfc(fc, "failed to set initial blksize");
626 sbi->dax_dev = fs_dax_get_by_bdev(sb->s_bdev,
631 err = erofs_read_superblock(sb);
635 if (sb->s_blocksize_bits != sbi->blkszbits) {
636 if (erofs_is_fscache_mode(sb)) {
637 errorfc(fc, "unsupported blksize for fscache mode");
640 if (!sb_set_blocksize(sb, 1 << sbi->blkszbits)) {
641 errorfc(fc, "failed to set erofs blksize");
646 if (test_opt(&sbi->opt, DAX_ALWAYS)) {
648 errorfc(fc, "DAX unsupported by block device. Turning off DAX.");
649 clear_opt(&sbi->opt, DAX_ALWAYS);
650 } else if (sbi->blkszbits != PAGE_SHIFT) {
651 errorfc(fc, "unsupported blocksize for DAX");
652 clear_opt(&sbi->opt, DAX_ALWAYS);
657 sb->s_xattr = erofs_xattr_handlers;
658 sb->s_export_op = &erofs_export_ops;
660 if (test_opt(&sbi->opt, POSIX_ACL))
661 sb->s_flags |= SB_POSIXACL;
663 sb->s_flags &= ~SB_POSIXACL;
665 #ifdef CONFIG_EROFS_FS_ZIP
666 xa_init(&sbi->managed_pslots);
669 inode = erofs_iget(sb, sbi->root_nid);
671 return PTR_ERR(inode);
673 if (!S_ISDIR(inode->i_mode)) {
674 erofs_err(sb, "rootino(nid %llu) is not a directory(i_mode %o)",
675 sbi->root_nid, inode->i_mode);
680 sb->s_root = d_make_root(inode);
684 erofs_shrinker_register(sb);
685 if (erofs_sb_has_fragments(sbi) && sbi->packed_nid) {
686 sbi->packed_inode = erofs_iget(sb, sbi->packed_nid);
687 if (IS_ERR(sbi->packed_inode)) {
688 err = PTR_ERR(sbi->packed_inode);
689 sbi->packed_inode = NULL;
693 err = erofs_init_managed_cache(sb);
697 err = erofs_xattr_prefixes_init(sb);
701 err = erofs_register_sysfs(sb);
705 erofs_info(sb, "mounted with root inode @ nid %llu.", sbi->root_nid);
709 static int erofs_fc_anon_get_tree(struct fs_context *fc)
711 return get_tree_nodev(fc, erofs_fc_fill_pseudo_super);
714 static int erofs_fc_get_tree(struct fs_context *fc)
716 struct erofs_fs_context *ctx = fc->fs_private;
718 if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && ctx->fsid)
719 return get_tree_nodev(fc, erofs_fc_fill_super);
721 return get_tree_bdev(fc, erofs_fc_fill_super);
724 static int erofs_fc_reconfigure(struct fs_context *fc)
726 struct super_block *sb = fc->root->d_sb;
727 struct erofs_sb_info *sbi = EROFS_SB(sb);
728 struct erofs_fs_context *ctx = fc->fs_private;
730 DBG_BUGON(!sb_rdonly(sb));
732 if (ctx->fsid || ctx->domain_id)
733 erofs_info(sb, "ignoring reconfiguration for fsid|domain_id.");
735 if (test_opt(&ctx->opt, POSIX_ACL))
736 fc->sb_flags |= SB_POSIXACL;
738 fc->sb_flags &= ~SB_POSIXACL;
742 fc->sb_flags |= SB_RDONLY;
746 static int erofs_release_device_info(int id, void *ptr, void *data)
748 struct erofs_device_info *dif = ptr;
750 fs_put_dax(dif->dax_dev, NULL);
751 if (dif->bdev_handle)
752 bdev_release(dif->bdev_handle);
753 erofs_fscache_unregister_cookie(dif->fscache);
760 static void erofs_free_dev_context(struct erofs_dev_context *devs)
764 idr_for_each(&devs->tree, &erofs_release_device_info, NULL);
765 idr_destroy(&devs->tree);
769 static void erofs_fc_free(struct fs_context *fc)
771 struct erofs_fs_context *ctx = fc->fs_private;
773 erofs_free_dev_context(ctx->devs);
775 kfree(ctx->domain_id);
779 static const struct fs_context_operations erofs_context_ops = {
780 .parse_param = erofs_fc_parse_param,
781 .get_tree = erofs_fc_get_tree,
782 .reconfigure = erofs_fc_reconfigure,
783 .free = erofs_fc_free,
786 static const struct fs_context_operations erofs_anon_context_ops = {
787 .get_tree = erofs_fc_anon_get_tree,
790 static int erofs_init_fs_context(struct fs_context *fc)
792 struct erofs_fs_context *ctx;
794 /* pseudo mount for anon inodes */
795 if (fc->sb_flags & SB_KERNMOUNT) {
796 fc->ops = &erofs_anon_context_ops;
800 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
803 ctx->devs = kzalloc(sizeof(struct erofs_dev_context), GFP_KERNEL);
808 fc->fs_private = ctx;
810 idr_init(&ctx->devs->tree);
811 init_rwsem(&ctx->devs->rwsem);
812 erofs_default_options(ctx);
813 fc->ops = &erofs_context_ops;
817 static void erofs_kill_sb(struct super_block *sb)
819 struct erofs_sb_info *sbi;
821 /* pseudo mount for anon inodes */
822 if (sb->s_flags & SB_KERNMOUNT) {
827 if (erofs_is_fscache_mode(sb))
830 kill_block_super(sb);
836 erofs_free_dev_context(sbi->devs);
837 fs_put_dax(sbi->dax_dev, NULL);
838 erofs_fscache_unregister_fs(sb);
840 kfree(sbi->domain_id);
842 sb->s_fs_info = NULL;
845 static void erofs_put_super(struct super_block *sb)
847 struct erofs_sb_info *const sbi = EROFS_SB(sb);
851 erofs_unregister_sysfs(sb);
852 erofs_shrinker_unregister(sb);
853 erofs_xattr_prefixes_cleanup(sb);
854 #ifdef CONFIG_EROFS_FS_ZIP
855 iput(sbi->managed_cache);
856 sbi->managed_cache = NULL;
858 iput(sbi->packed_inode);
859 sbi->packed_inode = NULL;
860 erofs_free_dev_context(sbi->devs);
862 erofs_fscache_unregister_fs(sb);
865 struct file_system_type erofs_fs_type = {
866 .owner = THIS_MODULE,
868 .init_fs_context = erofs_init_fs_context,
869 .kill_sb = erofs_kill_sb,
870 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
872 MODULE_ALIAS_FS("erofs");
874 static int __init erofs_module_init(void)
878 erofs_check_ondisk_layout_definitions();
880 erofs_inode_cachep = kmem_cache_create("erofs_inode",
881 sizeof(struct erofs_inode), 0,
882 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT,
883 erofs_inode_init_once);
884 if (!erofs_inode_cachep)
887 err = erofs_init_shrinker();
891 err = z_erofs_lzma_init();
895 err = z_erofs_deflate_init();
899 erofs_pcpubuf_init();
900 err = z_erofs_init_zip_subsystem();
904 err = erofs_init_sysfs();
908 err = register_filesystem(&erofs_fs_type);
917 z_erofs_exit_zip_subsystem();
919 z_erofs_deflate_exit();
923 erofs_exit_shrinker();
925 kmem_cache_destroy(erofs_inode_cachep);
929 static void __exit erofs_module_exit(void)
931 unregister_filesystem(&erofs_fs_type);
933 /* Ensure all RCU free inodes / pclusters are safe to be destroyed. */
937 z_erofs_exit_zip_subsystem();
938 z_erofs_deflate_exit();
940 erofs_exit_shrinker();
941 kmem_cache_destroy(erofs_inode_cachep);
942 erofs_pcpubuf_exit();
945 static int erofs_statfs(struct dentry *dentry, struct kstatfs *buf)
947 struct super_block *sb = dentry->d_sb;
948 struct erofs_sb_info *sbi = EROFS_SB(sb);
951 if (!erofs_is_fscache_mode(sb))
952 id = huge_encode_dev(sb->s_bdev->bd_dev);
954 buf->f_type = sb->s_magic;
955 buf->f_bsize = sb->s_blocksize;
956 buf->f_blocks = sbi->total_blocks;
957 buf->f_bfree = buf->f_bavail = 0;
959 buf->f_files = ULLONG_MAX;
960 buf->f_ffree = ULLONG_MAX - sbi->inos;
962 buf->f_namelen = EROFS_NAME_LEN;
964 buf->f_fsid = u64_to_fsid(id);
968 static int erofs_show_options(struct seq_file *seq, struct dentry *root)
970 struct erofs_sb_info *sbi = EROFS_SB(root->d_sb);
971 struct erofs_mount_opts *opt = &sbi->opt;
973 #ifdef CONFIG_EROFS_FS_XATTR
974 if (test_opt(opt, XATTR_USER))
975 seq_puts(seq, ",user_xattr");
977 seq_puts(seq, ",nouser_xattr");
979 #ifdef CONFIG_EROFS_FS_POSIX_ACL
980 if (test_opt(opt, POSIX_ACL))
981 seq_puts(seq, ",acl");
983 seq_puts(seq, ",noacl");
985 #ifdef CONFIG_EROFS_FS_ZIP
986 if (opt->cache_strategy == EROFS_ZIP_CACHE_DISABLED)
987 seq_puts(seq, ",cache_strategy=disabled");
988 else if (opt->cache_strategy == EROFS_ZIP_CACHE_READAHEAD)
989 seq_puts(seq, ",cache_strategy=readahead");
990 else if (opt->cache_strategy == EROFS_ZIP_CACHE_READAROUND)
991 seq_puts(seq, ",cache_strategy=readaround");
993 if (test_opt(opt, DAX_ALWAYS))
994 seq_puts(seq, ",dax=always");
995 if (test_opt(opt, DAX_NEVER))
996 seq_puts(seq, ",dax=never");
997 #ifdef CONFIG_EROFS_FS_ONDEMAND
999 seq_printf(seq, ",fsid=%s", sbi->fsid);
1001 seq_printf(seq, ",domain_id=%s", sbi->domain_id);
1006 const struct super_operations erofs_sops = {
1007 .put_super = erofs_put_super,
1008 .alloc_inode = erofs_alloc_inode,
1009 .free_inode = erofs_free_inode,
1010 .statfs = erofs_statfs,
1011 .show_options = erofs_show_options,
1014 module_init(erofs_module_init);
1015 module_exit(erofs_module_exit);
1017 MODULE_DESCRIPTION("Enhanced ROM File System");
1018 MODULE_AUTHOR("Gao Xiang, Chao Yu, Miao Xie, CONSUMER BG, HUAWEI Inc.");
1019 MODULE_LICENSE("GPL");