1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2017-2018 HUAWEI, Inc.
4 * https://www.huawei.com/
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>
17 #define CREATE_TRACE_POINTS
18 #include <trace/events/erofs.h>
20 static struct kmem_cache *erofs_inode_cachep __read_mostly;
22 void _erofs_err(struct super_block *sb, const char *function,
33 pr_err("(device %s): %s: %pV", sb->s_id, function, &vaf);
37 void _erofs_info(struct super_block *sb, const char *function,
48 pr_info("(device %s): %pV", sb->s_id, &vaf);
52 static int erofs_superblock_csum_verify(struct super_block *sb, void *sbdata)
54 struct erofs_super_block *dsb;
55 u32 expected_crc, crc;
57 dsb = kmemdup(sbdata + EROFS_SUPER_OFFSET,
58 EROFS_BLKSIZ - EROFS_SUPER_OFFSET, GFP_KERNEL);
62 expected_crc = le32_to_cpu(dsb->checksum);
64 /* to allow for x86 boot sectors and other oddities. */
65 crc = crc32c(~0, dsb, EROFS_BLKSIZ - EROFS_SUPER_OFFSET);
68 if (crc != expected_crc) {
69 erofs_err(sb, "invalid checksum 0x%08x, 0x%08x expected",
76 static void erofs_inode_init_once(void *ptr)
78 struct erofs_inode *vi = ptr;
80 inode_init_once(&vi->vfs_inode);
83 static struct inode *erofs_alloc_inode(struct super_block *sb)
85 struct erofs_inode *vi =
86 kmem_cache_alloc(erofs_inode_cachep, GFP_KERNEL);
91 /* zero out everything except vfs_inode */
92 memset(vi, 0, offsetof(struct erofs_inode, vfs_inode));
93 return &vi->vfs_inode;
96 static void erofs_free_inode(struct inode *inode)
98 struct erofs_inode *vi = EROFS_I(inode);
100 /* be careful of RCU symlink path */
101 if (inode->i_op == &erofs_fast_symlink_iops)
102 kfree(inode->i_link);
103 kfree(vi->xattr_shared_xattrs);
105 kmem_cache_free(erofs_inode_cachep, vi);
108 static bool check_layout_compatibility(struct super_block *sb,
109 struct erofs_super_block *dsb)
111 const unsigned int feature = le32_to_cpu(dsb->feature_incompat);
113 EROFS_SB(sb)->feature_incompat = feature;
115 /* check if current kernel meets all mandatory requirements */
116 if (feature & (~EROFS_ALL_FEATURE_INCOMPAT)) {
118 "unidentified incompatible feature %x, please upgrade kernel version",
119 feature & ~EROFS_ALL_FEATURE_INCOMPAT);
125 #ifdef CONFIG_EROFS_FS_ZIP
126 /* read variable-sized metadata, offset will be aligned by 4-byte */
127 static void *erofs_read_metadata(struct super_block *sb, struct page **pagep,
128 erofs_off_t *offset, int *lengthp)
130 struct page *page = *pagep;
135 *offset = round_up(*offset, 4);
136 blk = erofs_blknr(*offset);
138 if (!page || page->index != blk) {
143 page = erofs_get_meta_page(sb, blk);
149 len = le16_to_cpu(*(__le16 *)&ptr[erofs_blkoff(*offset)]);
152 buffer = kmalloc(len, GFP_KERNEL);
154 buffer = ERR_PTR(-ENOMEM);
157 *offset += sizeof(__le16);
160 for (i = 0; i < len; i += cnt) {
161 cnt = min(EROFS_BLKSIZ - (int)erofs_blkoff(*offset), len - i);
162 blk = erofs_blknr(*offset);
164 if (!page || page->index != blk) {
170 page = erofs_get_meta_page(sb, blk);
177 memcpy(buffer + i, ptr + erofs_blkoff(*offset), cnt);
189 static int erofs_load_compr_cfgs(struct super_block *sb,
190 struct erofs_super_block *dsb)
192 struct erofs_sb_info *sbi;
194 unsigned int algs, alg;
199 sbi->available_compr_algs = le16_to_cpu(dsb->u1.available_compr_algs);
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);
207 offset = EROFS_SUPER_OFFSET + sbi->sb_size;
212 for (algs = sbi->available_compr_algs; algs; algs >>= 1, ++alg) {
218 data = erofs_read_metadata(sb, &page, &offset, &size);
225 case Z_EROFS_COMPRESSION_LZ4:
226 ret = z_erofs_load_lz4_config(sb, dsb, data, size);
228 case Z_EROFS_COMPRESSION_LZMA:
229 ret = z_erofs_load_lzma_config(sb, dsb, data, size);
247 static int erofs_load_compr_cfgs(struct super_block *sb,
248 struct erofs_super_block *dsb)
250 if (dsb->u1.available_compr_algs) {
251 erofs_err(sb, "try to load compressed fs when compression is disabled");
258 static int erofs_init_devices(struct super_block *sb,
259 struct erofs_super_block *dsb)
261 struct erofs_sb_info *sbi = EROFS_SB(sb);
262 unsigned int ondisk_extradevs;
264 struct page *page = NULL;
265 struct erofs_device_info *dif;
266 struct erofs_deviceslot *dis;
270 sbi->total_blocks = sbi->primarydevice_blocks;
271 if (!erofs_sb_has_device_table(sbi))
272 ondisk_extradevs = 0;
274 ondisk_extradevs = le16_to_cpu(dsb->extra_devices);
276 if (ondisk_extradevs != sbi->devs->extra_devices) {
277 erofs_err(sb, "extra devices don't match (ondisk %u, given %u)",
278 ondisk_extradevs, sbi->devs->extra_devices);
281 if (!ondisk_extradevs)
284 sbi->device_id_mask = roundup_pow_of_two(ondisk_extradevs + 1) - 1;
285 pos = le16_to_cpu(dsb->devt_slotoff) * EROFS_DEVT_SLOT_SIZE;
286 down_read(&sbi->devs->rwsem);
287 idr_for_each_entry(&sbi->devs->tree, dif, id) {
288 erofs_blk_t blk = erofs_blknr(pos);
289 struct block_device *bdev;
291 if (!page || page->index != blk) {
298 page = erofs_get_meta_page(sb, blk);
300 up_read(&sbi->devs->rwsem);
301 return PTR_ERR(page);
305 dis = ptr + erofs_blkoff(pos);
307 bdev = blkdev_get_by_path(dif->path,
308 FMODE_READ | FMODE_EXCL,
315 dif->dax_dev = fs_dax_get_by_bdev(bdev);
316 dif->blocks = le32_to_cpu(dis->blocks);
317 dif->mapped_blkaddr = le32_to_cpu(dis->mapped_blkaddr);
318 sbi->total_blocks += dif->blocks;
319 pos += EROFS_DEVT_SLOT_SIZE;
322 up_read(&sbi->devs->rwsem);
331 static int erofs_read_superblock(struct super_block *sb)
333 struct erofs_sb_info *sbi;
335 struct erofs_super_block *dsb;
336 unsigned int blkszbits;
340 page = read_mapping_page(sb->s_bdev->bd_inode->i_mapping, 0, NULL);
342 erofs_err(sb, "cannot read erofs superblock");
343 return PTR_ERR(page);
349 dsb = (struct erofs_super_block *)(data + EROFS_SUPER_OFFSET);
352 if (le32_to_cpu(dsb->magic) != EROFS_SUPER_MAGIC_V1) {
353 erofs_err(sb, "cannot find valid erofs superblock");
357 sbi->feature_compat = le32_to_cpu(dsb->feature_compat);
358 if (erofs_sb_has_sb_chksum(sbi)) {
359 ret = erofs_superblock_csum_verify(sb, data);
365 blkszbits = dsb->blkszbits;
366 /* 9(512 bytes) + LOG_SECTORS_PER_BLOCK == LOG_BLOCK_SIZE */
367 if (blkszbits != LOG_BLOCK_SIZE) {
368 erofs_err(sb, "blkszbits %u isn't supported on this platform",
373 if (!check_layout_compatibility(sb, dsb))
376 sbi->sb_size = 128 + dsb->sb_extslots * EROFS_SB_EXTSLOT_SIZE;
377 if (sbi->sb_size > EROFS_BLKSIZ) {
378 erofs_err(sb, "invalid sb_extslots %u (more than a fs block)",
382 sbi->primarydevice_blocks = le32_to_cpu(dsb->blocks);
383 sbi->meta_blkaddr = le32_to_cpu(dsb->meta_blkaddr);
384 #ifdef CONFIG_EROFS_FS_XATTR
385 sbi->xattr_blkaddr = le32_to_cpu(dsb->xattr_blkaddr);
387 sbi->islotbits = ilog2(sizeof(struct erofs_inode_compact));
388 sbi->root_nid = le16_to_cpu(dsb->root_nid);
389 sbi->inos = le64_to_cpu(dsb->inos);
391 sbi->build_time = le64_to_cpu(dsb->build_time);
392 sbi->build_time_nsec = le32_to_cpu(dsb->build_time_nsec);
394 memcpy(&sb->s_uuid, dsb->uuid, sizeof(dsb->uuid));
396 ret = strscpy(sbi->volume_name, dsb->volume_name,
397 sizeof(dsb->volume_name));
398 if (ret < 0) { /* -E2BIG */
399 erofs_err(sb, "bad volume name without NIL terminator");
404 /* parse on-disk compression configurations */
405 if (erofs_sb_has_compr_cfgs(sbi))
406 ret = erofs_load_compr_cfgs(sb, dsb);
408 ret = z_erofs_load_lz4_config(sb, dsb, NULL, 0);
412 /* handle multiple devices */
413 ret = erofs_init_devices(sb, dsb);
420 /* set up default EROFS parameters */
421 static void erofs_default_options(struct erofs_fs_context *ctx)
423 #ifdef CONFIG_EROFS_FS_ZIP
424 ctx->opt.cache_strategy = EROFS_ZIP_CACHE_READAROUND;
425 ctx->opt.max_sync_decompress_pages = 3;
426 ctx->opt.readahead_sync_decompress = false;
428 #ifdef CONFIG_EROFS_FS_XATTR
429 set_opt(&ctx->opt, XATTR_USER);
431 #ifdef CONFIG_EROFS_FS_POSIX_ACL
432 set_opt(&ctx->opt, POSIX_ACL);
446 static const struct constant_table erofs_param_cache_strategy[] = {
447 {"disabled", EROFS_ZIP_CACHE_DISABLED},
448 {"readahead", EROFS_ZIP_CACHE_READAHEAD},
449 {"readaround", EROFS_ZIP_CACHE_READAROUND},
453 static const struct constant_table erofs_dax_param_enums[] = {
454 {"always", EROFS_MOUNT_DAX_ALWAYS},
455 {"never", EROFS_MOUNT_DAX_NEVER},
459 static const struct fs_parameter_spec erofs_fs_parameters[] = {
460 fsparam_flag_no("user_xattr", Opt_user_xattr),
461 fsparam_flag_no("acl", Opt_acl),
462 fsparam_enum("cache_strategy", Opt_cache_strategy,
463 erofs_param_cache_strategy),
464 fsparam_flag("dax", Opt_dax),
465 fsparam_enum("dax", Opt_dax_enum, erofs_dax_param_enums),
466 fsparam_string("device", Opt_device),
470 static bool erofs_fc_set_dax_mode(struct fs_context *fc, unsigned int mode)
473 struct erofs_fs_context *ctx = fc->fs_private;
476 case EROFS_MOUNT_DAX_ALWAYS:
477 warnfc(fc, "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
478 set_opt(&ctx->opt, DAX_ALWAYS);
479 clear_opt(&ctx->opt, DAX_NEVER);
481 case EROFS_MOUNT_DAX_NEVER:
482 set_opt(&ctx->opt, DAX_NEVER);
483 clear_opt(&ctx->opt, DAX_ALWAYS);
490 errorfc(fc, "dax options not supported");
495 static int erofs_fc_parse_param(struct fs_context *fc,
496 struct fs_parameter *param)
498 struct erofs_fs_context *ctx = fc->fs_private;
499 struct fs_parse_result result;
500 struct erofs_device_info *dif;
503 opt = fs_parse(fc, erofs_fs_parameters, param, &result);
509 #ifdef CONFIG_EROFS_FS_XATTR
511 set_opt(&ctx->opt, XATTR_USER);
513 clear_opt(&ctx->opt, XATTR_USER);
515 errorfc(fc, "{,no}user_xattr options not supported");
519 #ifdef CONFIG_EROFS_FS_POSIX_ACL
521 set_opt(&ctx->opt, POSIX_ACL);
523 clear_opt(&ctx->opt, POSIX_ACL);
525 errorfc(fc, "{,no}acl options not supported");
528 case Opt_cache_strategy:
529 #ifdef CONFIG_EROFS_FS_ZIP
530 ctx->opt.cache_strategy = result.uint_32;
532 errorfc(fc, "compression not supported, cache_strategy ignored");
536 if (!erofs_fc_set_dax_mode(fc, EROFS_MOUNT_DAX_ALWAYS))
540 if (!erofs_fc_set_dax_mode(fc, result.uint_32))
544 dif = kzalloc(sizeof(*dif), GFP_KERNEL);
547 dif->path = kstrdup(param->string, GFP_KERNEL);
552 down_write(&ctx->devs->rwsem);
553 ret = idr_alloc(&ctx->devs->tree, dif, 0, 0, GFP_KERNEL);
554 up_write(&ctx->devs->rwsem);
560 ++ctx->devs->extra_devices;
568 #ifdef CONFIG_EROFS_FS_ZIP
569 static const struct address_space_operations managed_cache_aops;
571 static int erofs_managed_cache_releasepage(struct page *page, gfp_t gfp_mask)
573 int ret = 1; /* 0 - busy */
574 struct address_space *const mapping = page->mapping;
576 DBG_BUGON(!PageLocked(page));
577 DBG_BUGON(mapping->a_ops != &managed_cache_aops);
579 if (PagePrivate(page))
580 ret = erofs_try_to_free_cached_page(page);
585 static void erofs_managed_cache_invalidatepage(struct page *page,
589 const unsigned int stop = length + offset;
591 DBG_BUGON(!PageLocked(page));
593 /* Check for potential overflow in debug mode */
594 DBG_BUGON(stop > PAGE_SIZE || stop < length);
596 if (offset == 0 && stop == PAGE_SIZE)
597 while (!erofs_managed_cache_releasepage(page, GFP_NOFS))
601 static const struct address_space_operations managed_cache_aops = {
602 .releasepage = erofs_managed_cache_releasepage,
603 .invalidatepage = erofs_managed_cache_invalidatepage,
606 static int erofs_init_managed_cache(struct super_block *sb)
608 struct erofs_sb_info *const sbi = EROFS_SB(sb);
609 struct inode *const inode = new_inode(sb);
615 inode->i_size = OFFSET_MAX;
617 inode->i_mapping->a_ops = &managed_cache_aops;
618 mapping_set_gfp_mask(inode->i_mapping,
619 GFP_NOFS | __GFP_HIGHMEM | __GFP_MOVABLE);
620 sbi->managed_cache = inode;
624 static int erofs_init_managed_cache(struct super_block *sb) { return 0; }
627 static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
630 struct erofs_sb_info *sbi;
631 struct erofs_fs_context *ctx = fc->fs_private;
634 sb->s_magic = EROFS_SUPER_MAGIC;
636 if (!sb_set_blocksize(sb, EROFS_BLKSIZ)) {
637 erofs_err(sb, "failed to set erofs blksize");
641 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
647 sbi->dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
648 sbi->devs = ctx->devs;
651 err = erofs_read_superblock(sb);
655 if (test_opt(&sbi->opt, DAX_ALWAYS) &&
656 !dax_supported(sbi->dax_dev, sb->s_bdev, EROFS_BLKSIZ, 0, bdev_nr_sectors(sb->s_bdev))) {
657 errorfc(fc, "DAX unsupported by block device. Turning off DAX.");
658 clear_opt(&sbi->opt, DAX_ALWAYS);
660 sb->s_flags |= SB_RDONLY | SB_NOATIME;
661 sb->s_maxbytes = MAX_LFS_FILESIZE;
664 sb->s_op = &erofs_sops;
665 sb->s_xattr = erofs_xattr_handlers;
667 if (test_opt(&sbi->opt, POSIX_ACL))
668 sb->s_flags |= SB_POSIXACL;
670 sb->s_flags &= ~SB_POSIXACL;
672 #ifdef CONFIG_EROFS_FS_ZIP
673 xa_init(&sbi->managed_pslots);
676 /* get the root inode */
677 inode = erofs_iget(sb, ROOT_NID(sbi), true);
679 return PTR_ERR(inode);
681 if (!S_ISDIR(inode->i_mode)) {
682 erofs_err(sb, "rootino(nid %llu) is not a directory(i_mode %o)",
683 ROOT_NID(sbi), inode->i_mode);
688 sb->s_root = d_make_root(inode);
692 erofs_shrinker_register(sb);
693 /* sb->s_umount is already locked, SB_ACTIVE and SB_BORN are not set */
694 err = erofs_init_managed_cache(sb);
698 erofs_info(sb, "mounted with root inode @ nid %llu.", ROOT_NID(sbi));
702 static int erofs_fc_get_tree(struct fs_context *fc)
704 return get_tree_bdev(fc, erofs_fc_fill_super);
707 static int erofs_fc_reconfigure(struct fs_context *fc)
709 struct super_block *sb = fc->root->d_sb;
710 struct erofs_sb_info *sbi = EROFS_SB(sb);
711 struct erofs_fs_context *ctx = fc->fs_private;
713 DBG_BUGON(!sb_rdonly(sb));
715 if (test_opt(&ctx->opt, POSIX_ACL))
716 fc->sb_flags |= SB_POSIXACL;
718 fc->sb_flags &= ~SB_POSIXACL;
722 fc->sb_flags |= SB_RDONLY;
726 static int erofs_release_device_info(int id, void *ptr, void *data)
728 struct erofs_device_info *dif = ptr;
730 fs_put_dax(dif->dax_dev);
732 blkdev_put(dif->bdev, FMODE_READ | FMODE_EXCL);
738 static void erofs_free_dev_context(struct erofs_dev_context *devs)
742 idr_for_each(&devs->tree, &erofs_release_device_info, NULL);
743 idr_destroy(&devs->tree);
747 static void erofs_fc_free(struct fs_context *fc)
749 struct erofs_fs_context *ctx = fc->fs_private;
751 erofs_free_dev_context(ctx->devs);
755 static const struct fs_context_operations erofs_context_ops = {
756 .parse_param = erofs_fc_parse_param,
757 .get_tree = erofs_fc_get_tree,
758 .reconfigure = erofs_fc_reconfigure,
759 .free = erofs_fc_free,
762 static int erofs_init_fs_context(struct fs_context *fc)
764 struct erofs_fs_context *ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
768 ctx->devs = kzalloc(sizeof(struct erofs_dev_context), GFP_KERNEL);
773 fc->fs_private = ctx;
775 idr_init(&ctx->devs->tree);
776 init_rwsem(&ctx->devs->rwsem);
777 erofs_default_options(ctx);
778 fc->ops = &erofs_context_ops;
783 * could be triggered after deactivate_locked_super()
784 * is called, thus including umount and failed to initialize.
786 static void erofs_kill_sb(struct super_block *sb)
788 struct erofs_sb_info *sbi;
790 WARN_ON(sb->s_magic != EROFS_SUPER_MAGIC);
792 kill_block_super(sb);
798 erofs_free_dev_context(sbi->devs);
799 fs_put_dax(sbi->dax_dev);
801 sb->s_fs_info = NULL;
804 /* called when ->s_root is non-NULL */
805 static void erofs_put_super(struct super_block *sb)
807 struct erofs_sb_info *const sbi = EROFS_SB(sb);
811 erofs_shrinker_unregister(sb);
812 #ifdef CONFIG_EROFS_FS_ZIP
813 iput(sbi->managed_cache);
814 sbi->managed_cache = NULL;
818 static struct file_system_type erofs_fs_type = {
819 .owner = THIS_MODULE,
821 .init_fs_context = erofs_init_fs_context,
822 .kill_sb = erofs_kill_sb,
823 .fs_flags = FS_REQUIRES_DEV,
825 MODULE_ALIAS_FS("erofs");
827 static int __init erofs_module_init(void)
831 erofs_check_ondisk_layout_definitions();
833 erofs_inode_cachep = kmem_cache_create("erofs_inode",
834 sizeof(struct erofs_inode), 0,
835 SLAB_RECLAIM_ACCOUNT,
836 erofs_inode_init_once);
837 if (!erofs_inode_cachep) {
842 err = erofs_init_shrinker();
846 err = z_erofs_lzma_init();
850 erofs_pcpubuf_init();
851 err = z_erofs_init_zip_subsystem();
855 err = register_filesystem(&erofs_fs_type);
862 z_erofs_exit_zip_subsystem();
866 erofs_exit_shrinker();
868 kmem_cache_destroy(erofs_inode_cachep);
873 static void __exit erofs_module_exit(void)
875 unregister_filesystem(&erofs_fs_type);
877 /* Ensure all RCU free inodes / pclusters are safe to be destroyed. */
880 z_erofs_exit_zip_subsystem();
882 erofs_exit_shrinker();
883 kmem_cache_destroy(erofs_inode_cachep);
884 erofs_pcpubuf_exit();
887 /* get filesystem statistics */
888 static int erofs_statfs(struct dentry *dentry, struct kstatfs *buf)
890 struct super_block *sb = dentry->d_sb;
891 struct erofs_sb_info *sbi = EROFS_SB(sb);
892 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
894 buf->f_type = sb->s_magic;
895 buf->f_bsize = EROFS_BLKSIZ;
896 buf->f_blocks = sbi->total_blocks;
897 buf->f_bfree = buf->f_bavail = 0;
899 buf->f_files = ULLONG_MAX;
900 buf->f_ffree = ULLONG_MAX - sbi->inos;
902 buf->f_namelen = EROFS_NAME_LEN;
904 buf->f_fsid = u64_to_fsid(id);
908 static int erofs_show_options(struct seq_file *seq, struct dentry *root)
910 struct erofs_sb_info *sbi = EROFS_SB(root->d_sb);
911 struct erofs_mount_opts *opt = &sbi->opt;
913 #ifdef CONFIG_EROFS_FS_XATTR
914 if (test_opt(opt, XATTR_USER))
915 seq_puts(seq, ",user_xattr");
917 seq_puts(seq, ",nouser_xattr");
919 #ifdef CONFIG_EROFS_FS_POSIX_ACL
920 if (test_opt(opt, POSIX_ACL))
921 seq_puts(seq, ",acl");
923 seq_puts(seq, ",noacl");
925 #ifdef CONFIG_EROFS_FS_ZIP
926 if (opt->cache_strategy == EROFS_ZIP_CACHE_DISABLED)
927 seq_puts(seq, ",cache_strategy=disabled");
928 else if (opt->cache_strategy == EROFS_ZIP_CACHE_READAHEAD)
929 seq_puts(seq, ",cache_strategy=readahead");
930 else if (opt->cache_strategy == EROFS_ZIP_CACHE_READAROUND)
931 seq_puts(seq, ",cache_strategy=readaround");
933 if (test_opt(opt, DAX_ALWAYS))
934 seq_puts(seq, ",dax=always");
935 if (test_opt(opt, DAX_NEVER))
936 seq_puts(seq, ",dax=never");
940 const struct super_operations erofs_sops = {
941 .put_super = erofs_put_super,
942 .alloc_inode = erofs_alloc_inode,
943 .free_inode = erofs_free_inode,
944 .statfs = erofs_statfs,
945 .show_options = erofs_show_options,
948 module_init(erofs_module_init);
949 module_exit(erofs_module_exit);
951 MODULE_DESCRIPTION("Enhanced ROM File System");
952 MODULE_AUTHOR("Gao Xiang, Chao Yu, Miao Xie, CONSUMER BG, HUAWEI Inc.");
953 MODULE_LICENSE("GPL");