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, ...)
31 pr_err("(device %s): %s: %pV", sb->s_id, func, &vaf);
33 pr_err("%s: %pV", func, &vaf);
37 void _erofs_info(struct super_block *sb, const char *func, const char *fmt, ...)
48 pr_info("(device %s): %pV", sb->s_id, &vaf);
54 static int erofs_superblock_csum_verify(struct super_block *sb, void *sbdata)
56 size_t len = 1 << EROFS_SB(sb)->blkszbits;
57 struct erofs_super_block *dsb;
58 u32 expected_crc, crc;
60 if (len > EROFS_SUPER_OFFSET)
61 len -= EROFS_SUPER_OFFSET;
63 dsb = kmemdup(sbdata + EROFS_SUPER_OFFSET, len, GFP_KERNEL);
67 expected_crc = le32_to_cpu(dsb->checksum);
69 /* to allow for x86 boot sectors and other oddities. */
70 crc = crc32c(~0, dsb, len);
73 if (crc != expected_crc) {
74 erofs_err(sb, "invalid checksum 0x%08x, 0x%08x expected",
81 static void erofs_inode_init_once(void *ptr)
83 struct erofs_inode *vi = ptr;
85 inode_init_once(&vi->vfs_inode);
88 static struct inode *erofs_alloc_inode(struct super_block *sb)
90 struct erofs_inode *vi =
91 alloc_inode_sb(sb, erofs_inode_cachep, GFP_KERNEL);
96 /* zero out everything except vfs_inode */
97 memset(vi, 0, offsetof(struct erofs_inode, vfs_inode));
98 return &vi->vfs_inode;
101 static void erofs_free_inode(struct inode *inode)
103 struct erofs_inode *vi = EROFS_I(inode);
105 if (inode->i_op == &erofs_fast_symlink_iops)
106 kfree(inode->i_link);
107 kfree(vi->xattr_shared_xattrs);
108 kmem_cache_free(erofs_inode_cachep, vi);
111 static bool check_layout_compatibility(struct super_block *sb,
112 struct erofs_super_block *dsb)
114 const unsigned int feature = le32_to_cpu(dsb->feature_incompat);
116 EROFS_SB(sb)->feature_incompat = feature;
118 /* check if current kernel meets all mandatory requirements */
119 if (feature & (~EROFS_ALL_FEATURE_INCOMPAT)) {
120 erofs_err(sb, "unidentified incompatible feature %x, please upgrade kernel",
121 feature & ~EROFS_ALL_FEATURE_INCOMPAT);
127 /* read variable-sized metadata, offset will be aligned by 4-byte */
128 void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
129 erofs_off_t *offset, int *lengthp)
134 *offset = round_up(*offset, 4);
135 ptr = erofs_bread(buf, erofs_blknr(sb, *offset), EROFS_KMAP);
139 len = le16_to_cpu(*(__le16 *)&ptr[erofs_blkoff(sb, *offset)]);
142 buffer = kmalloc(len, GFP_KERNEL);
144 return ERR_PTR(-ENOMEM);
145 *offset += sizeof(__le16);
148 for (i = 0; i < len; i += cnt) {
149 cnt = min_t(int, sb->s_blocksize - erofs_blkoff(sb, *offset),
151 ptr = erofs_bread(buf, erofs_blknr(sb, *offset), EROFS_KMAP);
156 memcpy(buffer + i, ptr + erofs_blkoff(sb, *offset), cnt);
162 #ifndef CONFIG_EROFS_FS_ZIP
163 static int z_erofs_parse_cfgs(struct super_block *sb,
164 struct erofs_super_block *dsb)
166 if (!dsb->u1.available_compr_algs)
169 erofs_err(sb, "compression disabled, unable to mount compressed EROFS");
174 static int erofs_init_device(struct erofs_buf *buf, struct super_block *sb,
175 struct erofs_device_info *dif, erofs_off_t *pos)
177 struct erofs_sb_info *sbi = EROFS_SB(sb);
178 struct erofs_fscache *fscache;
179 struct erofs_deviceslot *dis;
180 struct file *bdev_file;
183 ptr = erofs_read_metabuf(buf, sb, erofs_blknr(sb, *pos), EROFS_KMAP);
186 dis = ptr + erofs_blkoff(sb, *pos);
188 if (!sbi->devs->flatdev && !dif->path) {
190 erofs_err(sb, "empty device tag @ pos %llu", *pos);
193 dif->path = kmemdup_nul(dis->tag, sizeof(dis->tag), GFP_KERNEL);
198 if (erofs_is_fscache_mode(sb)) {
199 fscache = erofs_fscache_register_cookie(sb, dif->path, 0);
201 return PTR_ERR(fscache);
202 dif->fscache = fscache;
203 } else if (!sbi->devs->flatdev) {
204 bdev_file = bdev_file_open_by_path(dif->path, BLK_OPEN_READ,
206 if (IS_ERR(bdev_file))
207 return PTR_ERR(bdev_file);
208 dif->bdev_file = bdev_file;
209 dif->dax_dev = fs_dax_get_by_bdev(file_bdev(bdev_file),
210 &dif->dax_part_off, NULL, NULL);
213 dif->blocks = le32_to_cpu(dis->blocks);
214 dif->mapped_blkaddr = le32_to_cpu(dis->mapped_blkaddr);
215 sbi->total_blocks += dif->blocks;
216 *pos += EROFS_DEVT_SLOT_SIZE;
220 static int erofs_scan_devices(struct super_block *sb,
221 struct erofs_super_block *dsb)
223 struct erofs_sb_info *sbi = EROFS_SB(sb);
224 unsigned int ondisk_extradevs;
226 struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
227 struct erofs_device_info *dif;
230 sbi->total_blocks = sbi->primarydevice_blocks;
231 if (!erofs_sb_has_device_table(sbi))
232 ondisk_extradevs = 0;
234 ondisk_extradevs = le16_to_cpu(dsb->extra_devices);
236 if (sbi->devs->extra_devices &&
237 ondisk_extradevs != sbi->devs->extra_devices) {
238 erofs_err(sb, "extra devices don't match (ondisk %u, given %u)",
239 ondisk_extradevs, sbi->devs->extra_devices);
242 if (!ondisk_extradevs)
245 if (!sbi->devs->extra_devices && !erofs_is_fscache_mode(sb))
246 sbi->devs->flatdev = true;
248 sbi->device_id_mask = roundup_pow_of_two(ondisk_extradevs + 1) - 1;
249 pos = le16_to_cpu(dsb->devt_slotoff) * EROFS_DEVT_SLOT_SIZE;
250 down_read(&sbi->devs->rwsem);
251 if (sbi->devs->extra_devices) {
252 idr_for_each_entry(&sbi->devs->tree, dif, id) {
253 err = erofs_init_device(&buf, sb, dif, &pos);
258 for (id = 0; id < ondisk_extradevs; id++) {
259 dif = kzalloc(sizeof(*dif), GFP_KERNEL);
265 err = idr_alloc(&sbi->devs->tree, dif, 0, 0, GFP_KERNEL);
270 ++sbi->devs->extra_devices;
272 err = erofs_init_device(&buf, sb, dif, &pos);
277 up_read(&sbi->devs->rwsem);
278 erofs_put_metabuf(&buf);
282 static int erofs_read_superblock(struct super_block *sb)
284 struct erofs_sb_info *sbi;
285 struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
286 struct erofs_super_block *dsb;
290 data = erofs_read_metabuf(&buf, sb, 0, EROFS_KMAP);
292 erofs_err(sb, "cannot read erofs superblock");
293 return PTR_ERR(data);
297 dsb = (struct erofs_super_block *)(data + EROFS_SUPER_OFFSET);
300 if (le32_to_cpu(dsb->magic) != EROFS_SUPER_MAGIC_V1) {
301 erofs_err(sb, "cannot find valid erofs superblock");
305 sbi->blkszbits = dsb->blkszbits;
306 if (sbi->blkszbits < 9 || sbi->blkszbits > PAGE_SHIFT) {
307 erofs_err(sb, "blkszbits %u isn't supported", sbi->blkszbits);
310 if (dsb->dirblkbits) {
311 erofs_err(sb, "dirblkbits %u isn't supported", dsb->dirblkbits);
315 sbi->feature_compat = le32_to_cpu(dsb->feature_compat);
316 if (erofs_sb_has_sb_chksum(sbi)) {
317 ret = erofs_superblock_csum_verify(sb, data);
323 if (!check_layout_compatibility(sb, dsb))
326 sbi->sb_size = 128 + dsb->sb_extslots * EROFS_SB_EXTSLOT_SIZE;
327 if (sbi->sb_size > PAGE_SIZE - EROFS_SUPER_OFFSET) {
328 erofs_err(sb, "invalid sb_extslots %u (more than a fs block)",
332 sbi->primarydevice_blocks = le32_to_cpu(dsb->blocks);
333 sbi->meta_blkaddr = le32_to_cpu(dsb->meta_blkaddr);
334 #ifdef CONFIG_EROFS_FS_XATTR
335 sbi->xattr_blkaddr = le32_to_cpu(dsb->xattr_blkaddr);
336 sbi->xattr_prefix_start = le32_to_cpu(dsb->xattr_prefix_start);
337 sbi->xattr_prefix_count = dsb->xattr_prefix_count;
338 sbi->xattr_filter_reserved = dsb->xattr_filter_reserved;
340 sbi->islotbits = ilog2(sizeof(struct erofs_inode_compact));
341 sbi->root_nid = le16_to_cpu(dsb->root_nid);
342 sbi->packed_nid = le64_to_cpu(dsb->packed_nid);
343 sbi->inos = le64_to_cpu(dsb->inos);
345 sbi->build_time = le64_to_cpu(dsb->build_time);
346 sbi->build_time_nsec = le32_to_cpu(dsb->build_time_nsec);
348 memcpy(&sb->s_uuid, dsb->uuid, sizeof(dsb->uuid));
350 ret = strscpy(sbi->volume_name, dsb->volume_name,
351 sizeof(dsb->volume_name));
352 if (ret < 0) { /* -E2BIG */
353 erofs_err(sb, "bad volume name without NIL terminator");
358 /* parse on-disk compression configurations */
359 ret = z_erofs_parse_cfgs(sb, dsb);
363 /* handle multiple devices */
364 ret = erofs_scan_devices(sb, dsb);
366 if (erofs_is_fscache_mode(sb))
367 erofs_info(sb, "EXPERIMENTAL fscache-based on-demand read feature in use. Use at your own risk!");
369 erofs_put_metabuf(&buf);
373 static void erofs_default_options(struct erofs_fs_context *ctx)
375 #ifdef CONFIG_EROFS_FS_ZIP
376 ctx->opt.cache_strategy = EROFS_ZIP_CACHE_READAROUND;
377 ctx->opt.max_sync_decompress_pages = 3;
378 ctx->opt.sync_decompress = EROFS_SYNC_DECOMPRESS_AUTO;
380 #ifdef CONFIG_EROFS_FS_XATTR
381 set_opt(&ctx->opt, XATTR_USER);
383 #ifdef CONFIG_EROFS_FS_POSIX_ACL
384 set_opt(&ctx->opt, POSIX_ACL);
400 static const struct constant_table erofs_param_cache_strategy[] = {
401 {"disabled", EROFS_ZIP_CACHE_DISABLED},
402 {"readahead", EROFS_ZIP_CACHE_READAHEAD},
403 {"readaround", EROFS_ZIP_CACHE_READAROUND},
407 static const struct constant_table erofs_dax_param_enums[] = {
408 {"always", EROFS_MOUNT_DAX_ALWAYS},
409 {"never", EROFS_MOUNT_DAX_NEVER},
413 static const struct fs_parameter_spec erofs_fs_parameters[] = {
414 fsparam_flag_no("user_xattr", Opt_user_xattr),
415 fsparam_flag_no("acl", Opt_acl),
416 fsparam_enum("cache_strategy", Opt_cache_strategy,
417 erofs_param_cache_strategy),
418 fsparam_flag("dax", Opt_dax),
419 fsparam_enum("dax", Opt_dax_enum, erofs_dax_param_enums),
420 fsparam_string("device", Opt_device),
421 fsparam_string("fsid", Opt_fsid),
422 fsparam_string("domain_id", Opt_domain_id),
426 static bool erofs_fc_set_dax_mode(struct fs_context *fc, unsigned int mode)
429 struct erofs_fs_context *ctx = fc->fs_private;
432 case EROFS_MOUNT_DAX_ALWAYS:
433 warnfc(fc, "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
434 set_opt(&ctx->opt, DAX_ALWAYS);
435 clear_opt(&ctx->opt, DAX_NEVER);
437 case EROFS_MOUNT_DAX_NEVER:
438 set_opt(&ctx->opt, DAX_NEVER);
439 clear_opt(&ctx->opt, DAX_ALWAYS);
446 errorfc(fc, "dax options not supported");
451 static int erofs_fc_parse_param(struct fs_context *fc,
452 struct fs_parameter *param)
454 struct erofs_fs_context *ctx = fc->fs_private;
455 struct fs_parse_result result;
456 struct erofs_device_info *dif;
459 opt = fs_parse(fc, erofs_fs_parameters, param, &result);
465 #ifdef CONFIG_EROFS_FS_XATTR
467 set_opt(&ctx->opt, XATTR_USER);
469 clear_opt(&ctx->opt, XATTR_USER);
471 errorfc(fc, "{,no}user_xattr options not supported");
475 #ifdef CONFIG_EROFS_FS_POSIX_ACL
477 set_opt(&ctx->opt, POSIX_ACL);
479 clear_opt(&ctx->opt, POSIX_ACL);
481 errorfc(fc, "{,no}acl options not supported");
484 case Opt_cache_strategy:
485 #ifdef CONFIG_EROFS_FS_ZIP
486 ctx->opt.cache_strategy = result.uint_32;
488 errorfc(fc, "compression not supported, cache_strategy ignored");
492 if (!erofs_fc_set_dax_mode(fc, EROFS_MOUNT_DAX_ALWAYS))
496 if (!erofs_fc_set_dax_mode(fc, result.uint_32))
500 dif = kzalloc(sizeof(*dif), GFP_KERNEL);
503 dif->path = kstrdup(param->string, GFP_KERNEL);
508 down_write(&ctx->devs->rwsem);
509 ret = idr_alloc(&ctx->devs->tree, dif, 0, 0, GFP_KERNEL);
510 up_write(&ctx->devs->rwsem);
516 ++ctx->devs->extra_devices;
518 #ifdef CONFIG_EROFS_FS_ONDEMAND
521 ctx->fsid = kstrdup(param->string, GFP_KERNEL);
526 kfree(ctx->domain_id);
527 ctx->domain_id = kstrdup(param->string, GFP_KERNEL);
534 errorfc(fc, "%s option not supported", erofs_fs_parameters[opt].name);
543 static struct inode *erofs_nfs_get_inode(struct super_block *sb,
544 u64 ino, u32 generation)
546 return erofs_iget(sb, ino);
549 static struct dentry *erofs_fh_to_dentry(struct super_block *sb,
550 struct fid *fid, int fh_len, int fh_type)
552 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
553 erofs_nfs_get_inode);
556 static struct dentry *erofs_fh_to_parent(struct super_block *sb,
557 struct fid *fid, int fh_len, int fh_type)
559 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
560 erofs_nfs_get_inode);
563 static struct dentry *erofs_get_parent(struct dentry *child)
569 err = erofs_namei(d_inode(child), &dotdot_name, &nid, &d_type);
572 return d_obtain_alias(erofs_iget(child->d_sb, nid));
575 static const struct export_operations erofs_export_ops = {
576 .encode_fh = generic_encode_ino32_fh,
577 .fh_to_dentry = erofs_fh_to_dentry,
578 .fh_to_parent = erofs_fh_to_parent,
579 .get_parent = erofs_get_parent,
582 static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
585 struct erofs_sb_info *sbi;
586 struct erofs_fs_context *ctx = fc->fs_private;
589 sb->s_magic = EROFS_SUPER_MAGIC;
590 sb->s_flags |= SB_RDONLY | SB_NOATIME;
591 sb->s_maxbytes = MAX_LFS_FILESIZE;
592 sb->s_op = &erofs_sops;
594 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
600 sbi->devs = ctx->devs;
602 sbi->fsid = ctx->fsid;
604 sbi->domain_id = ctx->domain_id;
605 ctx->domain_id = NULL;
607 sbi->blkszbits = PAGE_SHIFT;
608 if (erofs_is_fscache_mode(sb)) {
609 sb->s_blocksize = PAGE_SIZE;
610 sb->s_blocksize_bits = PAGE_SHIFT;
612 err = erofs_fscache_register_fs(sb);
616 err = super_setup_bdi(sb);
620 if (!sb_set_blocksize(sb, PAGE_SIZE)) {
621 errorfc(fc, "failed to set initial blksize");
625 sbi->dax_dev = fs_dax_get_by_bdev(sb->s_bdev,
630 err = erofs_read_superblock(sb);
634 if (sb->s_blocksize_bits != sbi->blkszbits) {
635 if (erofs_is_fscache_mode(sb)) {
636 errorfc(fc, "unsupported blksize for fscache mode");
639 if (!sb_set_blocksize(sb, 1 << sbi->blkszbits)) {
640 errorfc(fc, "failed to set erofs blksize");
645 if (test_opt(&sbi->opt, DAX_ALWAYS)) {
647 errorfc(fc, "DAX unsupported by block device. Turning off DAX.");
648 clear_opt(&sbi->opt, DAX_ALWAYS);
649 } else if (sbi->blkszbits != PAGE_SHIFT) {
650 errorfc(fc, "unsupported blocksize for DAX");
651 clear_opt(&sbi->opt, DAX_ALWAYS);
656 sb->s_xattr = erofs_xattr_handlers;
657 sb->s_export_op = &erofs_export_ops;
659 if (test_opt(&sbi->opt, POSIX_ACL))
660 sb->s_flags |= SB_POSIXACL;
662 sb->s_flags &= ~SB_POSIXACL;
664 #ifdef CONFIG_EROFS_FS_ZIP
665 xa_init(&sbi->managed_pslots);
668 inode = erofs_iget(sb, sbi->root_nid);
670 return PTR_ERR(inode);
672 if (!S_ISDIR(inode->i_mode)) {
673 erofs_err(sb, "rootino(nid %llu) is not a directory(i_mode %o)",
674 sbi->root_nid, inode->i_mode);
679 sb->s_root = d_make_root(inode);
683 erofs_shrinker_register(sb);
684 if (erofs_sb_has_fragments(sbi) && sbi->packed_nid) {
685 sbi->packed_inode = erofs_iget(sb, sbi->packed_nid);
686 if (IS_ERR(sbi->packed_inode)) {
687 err = PTR_ERR(sbi->packed_inode);
688 sbi->packed_inode = NULL;
692 err = erofs_init_managed_cache(sb);
696 err = erofs_xattr_prefixes_init(sb);
700 err = erofs_register_sysfs(sb);
704 erofs_info(sb, "mounted with root inode @ nid %llu.", sbi->root_nid);
708 static int erofs_fc_get_tree(struct fs_context *fc)
710 struct erofs_fs_context *ctx = fc->fs_private;
712 if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && ctx->fsid)
713 return get_tree_nodev(fc, erofs_fc_fill_super);
715 return get_tree_bdev(fc, erofs_fc_fill_super);
718 static int erofs_fc_reconfigure(struct fs_context *fc)
720 struct super_block *sb = fc->root->d_sb;
721 struct erofs_sb_info *sbi = EROFS_SB(sb);
722 struct erofs_fs_context *ctx = fc->fs_private;
724 DBG_BUGON(!sb_rdonly(sb));
726 if (ctx->fsid || ctx->domain_id)
727 erofs_info(sb, "ignoring reconfiguration for fsid|domain_id.");
729 if (test_opt(&ctx->opt, POSIX_ACL))
730 fc->sb_flags |= SB_POSIXACL;
732 fc->sb_flags &= ~SB_POSIXACL;
736 fc->sb_flags |= SB_RDONLY;
740 static int erofs_release_device_info(int id, void *ptr, void *data)
742 struct erofs_device_info *dif = ptr;
744 fs_put_dax(dif->dax_dev, NULL);
746 fput(dif->bdev_file);
747 erofs_fscache_unregister_cookie(dif->fscache);
754 static void erofs_free_dev_context(struct erofs_dev_context *devs)
758 idr_for_each(&devs->tree, &erofs_release_device_info, NULL);
759 idr_destroy(&devs->tree);
763 static void erofs_fc_free(struct fs_context *fc)
765 struct erofs_fs_context *ctx = fc->fs_private;
767 erofs_free_dev_context(ctx->devs);
769 kfree(ctx->domain_id);
773 static const struct fs_context_operations erofs_context_ops = {
774 .parse_param = erofs_fc_parse_param,
775 .get_tree = erofs_fc_get_tree,
776 .reconfigure = erofs_fc_reconfigure,
777 .free = erofs_fc_free,
780 static int erofs_init_fs_context(struct fs_context *fc)
782 struct erofs_fs_context *ctx;
784 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
787 ctx->devs = kzalloc(sizeof(struct erofs_dev_context), GFP_KERNEL);
792 fc->fs_private = ctx;
794 idr_init(&ctx->devs->tree);
795 init_rwsem(&ctx->devs->rwsem);
796 erofs_default_options(ctx);
797 fc->ops = &erofs_context_ops;
801 static void erofs_kill_sb(struct super_block *sb)
803 struct erofs_sb_info *sbi;
805 if (erofs_is_fscache_mode(sb))
808 kill_block_super(sb);
814 erofs_free_dev_context(sbi->devs);
815 fs_put_dax(sbi->dax_dev, NULL);
816 erofs_fscache_unregister_fs(sb);
818 kfree(sbi->domain_id);
820 sb->s_fs_info = NULL;
823 static void erofs_put_super(struct super_block *sb)
825 struct erofs_sb_info *const sbi = EROFS_SB(sb);
829 erofs_unregister_sysfs(sb);
830 erofs_shrinker_unregister(sb);
831 erofs_xattr_prefixes_cleanup(sb);
832 #ifdef CONFIG_EROFS_FS_ZIP
833 iput(sbi->managed_cache);
834 sbi->managed_cache = NULL;
836 iput(sbi->packed_inode);
837 sbi->packed_inode = NULL;
838 erofs_free_dev_context(sbi->devs);
840 erofs_fscache_unregister_fs(sb);
843 static struct file_system_type erofs_fs_type = {
844 .owner = THIS_MODULE,
846 .init_fs_context = erofs_init_fs_context,
847 .kill_sb = erofs_kill_sb,
848 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
850 MODULE_ALIAS_FS("erofs");
852 static int __init erofs_module_init(void)
856 erofs_check_ondisk_layout_definitions();
858 erofs_inode_cachep = kmem_cache_create("erofs_inode",
859 sizeof(struct erofs_inode), 0,
860 SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
861 erofs_inode_init_once);
862 if (!erofs_inode_cachep)
865 err = erofs_init_shrinker();
869 err = z_erofs_lzma_init();
873 err = z_erofs_deflate_init();
877 erofs_pcpubuf_init();
878 err = z_erofs_init_zip_subsystem();
882 err = erofs_init_sysfs();
886 err = register_filesystem(&erofs_fs_type);
895 z_erofs_exit_zip_subsystem();
897 z_erofs_deflate_exit();
901 erofs_exit_shrinker();
903 kmem_cache_destroy(erofs_inode_cachep);
907 static void __exit erofs_module_exit(void)
909 unregister_filesystem(&erofs_fs_type);
911 /* Ensure all RCU free inodes / pclusters are safe to be destroyed. */
915 z_erofs_exit_zip_subsystem();
916 z_erofs_deflate_exit();
918 erofs_exit_shrinker();
919 kmem_cache_destroy(erofs_inode_cachep);
920 erofs_pcpubuf_exit();
923 static int erofs_statfs(struct dentry *dentry, struct kstatfs *buf)
925 struct super_block *sb = dentry->d_sb;
926 struct erofs_sb_info *sbi = EROFS_SB(sb);
929 if (!erofs_is_fscache_mode(sb))
930 id = huge_encode_dev(sb->s_bdev->bd_dev);
932 buf->f_type = sb->s_magic;
933 buf->f_bsize = sb->s_blocksize;
934 buf->f_blocks = sbi->total_blocks;
935 buf->f_bfree = buf->f_bavail = 0;
937 buf->f_files = ULLONG_MAX;
938 buf->f_ffree = ULLONG_MAX - sbi->inos;
940 buf->f_namelen = EROFS_NAME_LEN;
942 buf->f_fsid = u64_to_fsid(id);
946 static int erofs_show_options(struct seq_file *seq, struct dentry *root)
948 struct erofs_sb_info *sbi = EROFS_SB(root->d_sb);
949 struct erofs_mount_opts *opt = &sbi->opt;
951 #ifdef CONFIG_EROFS_FS_XATTR
952 if (test_opt(opt, XATTR_USER))
953 seq_puts(seq, ",user_xattr");
955 seq_puts(seq, ",nouser_xattr");
957 #ifdef CONFIG_EROFS_FS_POSIX_ACL
958 if (test_opt(opt, POSIX_ACL))
959 seq_puts(seq, ",acl");
961 seq_puts(seq, ",noacl");
963 #ifdef CONFIG_EROFS_FS_ZIP
964 if (opt->cache_strategy == EROFS_ZIP_CACHE_DISABLED)
965 seq_puts(seq, ",cache_strategy=disabled");
966 else if (opt->cache_strategy == EROFS_ZIP_CACHE_READAHEAD)
967 seq_puts(seq, ",cache_strategy=readahead");
968 else if (opt->cache_strategy == EROFS_ZIP_CACHE_READAROUND)
969 seq_puts(seq, ",cache_strategy=readaround");
971 if (test_opt(opt, DAX_ALWAYS))
972 seq_puts(seq, ",dax=always");
973 if (test_opt(opt, DAX_NEVER))
974 seq_puts(seq, ",dax=never");
975 #ifdef CONFIG_EROFS_FS_ONDEMAND
977 seq_printf(seq, ",fsid=%s", sbi->fsid);
979 seq_printf(seq, ",domain_id=%s", sbi->domain_id);
984 const struct super_operations erofs_sops = {
985 .put_super = erofs_put_super,
986 .alloc_inode = erofs_alloc_inode,
987 .free_inode = erofs_free_inode,
988 .statfs = erofs_statfs,
989 .show_options = erofs_show_options,
992 module_init(erofs_module_init);
993 module_exit(erofs_module_exit);
995 MODULE_DESCRIPTION("Enhanced ROM File System");
996 MODULE_AUTHOR("Gao Xiang, Chao Yu, Miao Xie, CONSUMER BG, HUAWEI Inc.");
997 MODULE_LICENSE("GPL");