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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (C) 2017-2018 HUAWEI, Inc.
- * https://www.huawei.com/
- * Created by Gao Xiang <gaoxiang25@huawei.com>
- */
- #include <linux/module.h>
- #include <linux/buffer_head.h>
- #include <linux/statfs.h>
- #include <linux/parser.h>
- #include <linux/seq_file.h>
- #include <linux/crc32c.h>
- #include <linux/fs_context.h>
- #include <linux/fs_parser.h>
- #include "xattr.h"
- #define CREATE_TRACE_POINTS
- #include <trace/events/erofs.h>
- static struct kmem_cache *erofs_inode_cachep __read_mostly;
- void _erofs_err(struct super_block *sb, const char *function,
- const char *fmt, ...)
- {
- struct va_format vaf;
- va_list args;
- va_start(args, fmt);
- vaf.fmt = fmt;
- vaf.va = &args;
- pr_err("(device %s): %s: %pV", sb->s_id, function, &vaf);
- va_end(args);
- }
- void _erofs_info(struct super_block *sb, const char *function,
- const char *fmt, ...)
- {
- struct va_format vaf;
- va_list args;
- va_start(args, fmt);
- vaf.fmt = fmt;
- vaf.va = &args;
- pr_info("(device %s): %pV", sb->s_id, &vaf);
- va_end(args);
- }
- static int erofs_superblock_csum_verify(struct super_block *sb, void *sbdata)
- {
- struct erofs_super_block *dsb;
- u32 expected_crc, crc;
- dsb = kmemdup(sbdata + EROFS_SUPER_OFFSET,
- EROFS_BLKSIZ - EROFS_SUPER_OFFSET, GFP_KERNEL);
- if (!dsb)
- return -ENOMEM;
- expected_crc = le32_to_cpu(dsb->checksum);
- dsb->checksum = 0;
- /* to allow for x86 boot sectors and other oddities. */
- crc = crc32c(~0, dsb, EROFS_BLKSIZ - EROFS_SUPER_OFFSET);
- kfree(dsb);
- if (crc != expected_crc) {
- erofs_err(sb, "invalid checksum 0x%08x, 0x%08x expected",
- crc, expected_crc);
- return -EBADMSG;
- }
- return 0;
- }
- static void erofs_inode_init_once(void *ptr)
- {
- struct erofs_inode *vi = ptr;
- inode_init_once(&vi->vfs_inode);
- }
- static struct inode *erofs_alloc_inode(struct super_block *sb)
- {
- struct erofs_inode *vi =
- kmem_cache_alloc(erofs_inode_cachep, GFP_KERNEL);
- if (!vi)
- return NULL;
- /* zero out everything except vfs_inode */
- memset(vi, 0, offsetof(struct erofs_inode, vfs_inode));
- return &vi->vfs_inode;
- }
- static void erofs_free_inode(struct inode *inode)
- {
- struct erofs_inode *vi = EROFS_I(inode);
- /* be careful of RCU symlink path */
- if (inode->i_op == &erofs_fast_symlink_iops)
- kfree(inode->i_link);
- kfree(vi->xattr_shared_xattrs);
- kmem_cache_free(erofs_inode_cachep, vi);
- }
- static bool check_layout_compatibility(struct super_block *sb,
- struct erofs_super_block *dsb)
- {
- const unsigned int feature = le32_to_cpu(dsb->feature_incompat);
- EROFS_SB(sb)->feature_incompat = feature;
- /* check if current kernel meets all mandatory requirements */
- if (feature & (~EROFS_ALL_FEATURE_INCOMPAT)) {
- erofs_err(sb,
- "unidentified incompatible feature %x, please upgrade kernel version",
- feature & ~EROFS_ALL_FEATURE_INCOMPAT);
- return false;
- }
- return true;
- }
- #ifdef CONFIG_EROFS_FS_ZIP
- /* read variable-sized metadata, offset will be aligned by 4-byte */
- static void *erofs_read_metadata(struct super_block *sb, struct page **pagep,
- erofs_off_t *offset, int *lengthp)
- {
- struct page *page = *pagep;
- u8 *buffer, *ptr;
- int len, i, cnt;
- erofs_blk_t blk;
- *offset = round_up(*offset, 4);
- blk = erofs_blknr(*offset);
- if (!page || page->index != blk) {
- if (page) {
- unlock_page(page);
- put_page(page);
- }
- page = erofs_get_meta_page(sb, blk);
- if (IS_ERR(page))
- goto err_nullpage;
- }
- ptr = kmap(page);
- len = le16_to_cpu(*(__le16 *)&ptr[erofs_blkoff(*offset)]);
- if (!len)
- len = U16_MAX + 1;
- buffer = kmalloc(len, GFP_KERNEL);
- if (!buffer) {
- buffer = ERR_PTR(-ENOMEM);
- goto out;
- }
- *offset += sizeof(__le16);
- *lengthp = len;
- for (i = 0; i < len; i += cnt) {
- cnt = min(EROFS_BLKSIZ - (int)erofs_blkoff(*offset), len - i);
- blk = erofs_blknr(*offset);
- if (!page || page->index != blk) {
- if (page) {
- kunmap(page);
- unlock_page(page);
- put_page(page);
- }
- page = erofs_get_meta_page(sb, blk);
- if (IS_ERR(page)) {
- kfree(buffer);
- goto err_nullpage;
- }
- ptr = kmap(page);
- }
- memcpy(buffer + i, ptr + erofs_blkoff(*offset), cnt);
- *offset += cnt;
- }
- out:
- kunmap(page);
- *pagep = page;
- return buffer;
- err_nullpage:
- *pagep = NULL;
- return page;
- }
- static int erofs_load_compr_cfgs(struct super_block *sb,
- struct erofs_super_block *dsb)
- {
- struct erofs_sb_info *sbi;
- struct page *page;
- unsigned int algs, alg;
- erofs_off_t offset;
- int size, ret;
- sbi = EROFS_SB(sb);
- sbi->available_compr_algs = le16_to_cpu(dsb->u1.available_compr_algs);
- if (sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS) {
- erofs_err(sb, "try to load compressed fs with unsupported algorithms %x",
- sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS);
- return -EINVAL;
- }
- offset = EROFS_SUPER_OFFSET + sbi->sb_size;
- page = NULL;
- alg = 0;
- ret = 0;
- for (algs = sbi->available_compr_algs; algs; algs >>= 1, ++alg) {
- void *data;
- if (!(algs & 1))
- continue;
- data = erofs_read_metadata(sb, &page, &offset, &size);
- if (IS_ERR(data)) {
- ret = PTR_ERR(data);
- goto err;
- }
- switch (alg) {
- case Z_EROFS_COMPRESSION_LZ4:
- ret = z_erofs_load_lz4_config(sb, dsb, data, size);
- break;
- default:
- DBG_BUGON(1);
- ret = -EFAULT;
- }
- kfree(data);
- if (ret)
- goto err;
- }
- err:
- if (page) {
- unlock_page(page);
- put_page(page);
- }
- return ret;
- }
- #else
- static int erofs_load_compr_cfgs(struct super_block *sb,
- struct erofs_super_block *dsb)
- {
- if (dsb->u1.available_compr_algs) {
- erofs_err(sb, "try to load compressed fs when compression is disabled");
- return -EINVAL;
- }
- return 0;
- }
- #endif
- static int erofs_read_superblock(struct super_block *sb)
- {
- struct erofs_sb_info *sbi;
- struct page *page;
- struct erofs_super_block *dsb;
- unsigned int blkszbits;
- void *data;
- int ret;
- page = read_mapping_page(sb->s_bdev->bd_inode->i_mapping, 0, NULL);
- if (IS_ERR(page)) {
- erofs_err(sb, "cannot read erofs superblock");
- return PTR_ERR(page);
- }
- sbi = EROFS_SB(sb);
- data = kmap(page);
- dsb = (struct erofs_super_block *)(data + EROFS_SUPER_OFFSET);
- ret = -EINVAL;
- if (le32_to_cpu(dsb->magic) != EROFS_SUPER_MAGIC_V1) {
- erofs_err(sb, "cannot find valid erofs superblock");
- goto out;
- }
- sbi->feature_compat = le32_to_cpu(dsb->feature_compat);
- if (erofs_sb_has_sb_chksum(sbi)) {
- ret = erofs_superblock_csum_verify(sb, data);
- if (ret)
- goto out;
- }
- ret = -EINVAL;
- blkszbits = dsb->blkszbits;
- /* 9(512 bytes) + LOG_SECTORS_PER_BLOCK == LOG_BLOCK_SIZE */
- if (blkszbits != LOG_BLOCK_SIZE) {
- erofs_err(sb, "blkszbits %u isn't supported on this platform",
- blkszbits);
- goto out;
- }
- if (!check_layout_compatibility(sb, dsb))
- goto out;
- sbi->sb_size = 128 + dsb->sb_extslots * EROFS_SB_EXTSLOT_SIZE;
- if (sbi->sb_size > EROFS_BLKSIZ) {
- erofs_err(sb, "invalid sb_extslots %u (more than a fs block)",
- sbi->sb_size);
- goto out;
- }
- sbi->blocks = le32_to_cpu(dsb->blocks);
- sbi->meta_blkaddr = le32_to_cpu(dsb->meta_blkaddr);
- #ifdef CONFIG_EROFS_FS_XATTR
- sbi->xattr_blkaddr = le32_to_cpu(dsb->xattr_blkaddr);
- #endif
- sbi->islotbits = ilog2(sizeof(struct erofs_inode_compact));
- sbi->root_nid = le16_to_cpu(dsb->root_nid);
- sbi->inos = le64_to_cpu(dsb->inos);
- sbi->build_time = le64_to_cpu(dsb->build_time);
- sbi->build_time_nsec = le32_to_cpu(dsb->build_time_nsec);
- memcpy(&sb->s_uuid, dsb->uuid, sizeof(dsb->uuid));
- ret = strscpy(sbi->volume_name, dsb->volume_name,
- sizeof(dsb->volume_name));
- if (ret < 0) { /* -E2BIG */
- erofs_err(sb, "bad volume name without NIL terminator");
- ret = -EFSCORRUPTED;
- goto out;
- }
- /* parse on-disk compression configurations */
- if (erofs_sb_has_compr_cfgs(sbi))
- ret = erofs_load_compr_cfgs(sb, dsb);
- else
- ret = z_erofs_load_lz4_config(sb, dsb, NULL, 0);
- out:
- kunmap(page);
- put_page(page);
- return ret;
- }
- /* set up default EROFS parameters */
- static void erofs_default_options(struct erofs_fs_context *ctx)
- {
- #ifdef CONFIG_EROFS_FS_ZIP
- ctx->cache_strategy = EROFS_ZIP_CACHE_READAROUND;
- ctx->max_sync_decompress_pages = 3;
- ctx->readahead_sync_decompress = false;
- #endif
- #ifdef CONFIG_EROFS_FS_XATTR
- set_opt(ctx, XATTR_USER);
- #endif
- #ifdef CONFIG_EROFS_FS_POSIX_ACL
- set_opt(ctx, POSIX_ACL);
- #endif
- }
- enum {
- Opt_user_xattr,
- Opt_acl,
- Opt_cache_strategy,
- Opt_err
- };
- static const struct constant_table erofs_param_cache_strategy[] = {
- {"disabled", EROFS_ZIP_CACHE_DISABLED},
- {"readahead", EROFS_ZIP_CACHE_READAHEAD},
- {"readaround", EROFS_ZIP_CACHE_READAROUND},
- {}
- };
- static const struct fs_parameter_spec erofs_fs_parameters[] = {
- fsparam_flag_no("user_xattr", Opt_user_xattr),
- fsparam_flag_no("acl", Opt_acl),
- fsparam_enum("cache_strategy", Opt_cache_strategy,
- erofs_param_cache_strategy),
- {}
- };
- static int erofs_fc_parse_param(struct fs_context *fc,
- struct fs_parameter *param)
- {
- struct erofs_fs_context *ctx __maybe_unused = fc->fs_private;
- struct fs_parse_result result;
- int opt;
- opt = fs_parse(fc, erofs_fs_parameters, param, &result);
- if (opt < 0)
- return opt;
- switch (opt) {
- case Opt_user_xattr:
- #ifdef CONFIG_EROFS_FS_XATTR
- if (result.boolean)
- set_opt(ctx, XATTR_USER);
- else
- clear_opt(ctx, XATTR_USER);
- #else
- errorfc(fc, "{,no}user_xattr options not supported");
- #endif
- break;
- case Opt_acl:
- #ifdef CONFIG_EROFS_FS_POSIX_ACL
- if (result.boolean)
- set_opt(ctx, POSIX_ACL);
- else
- clear_opt(ctx, POSIX_ACL);
- #else
- errorfc(fc, "{,no}acl options not supported");
- #endif
- break;
- case Opt_cache_strategy:
- #ifdef CONFIG_EROFS_FS_ZIP
- ctx->cache_strategy = result.uint_32;
- #else
- errorfc(fc, "compression not supported, cache_strategy ignored");
- #endif
- break;
- default:
- return -ENOPARAM;
- }
- return 0;
- }
- #ifdef CONFIG_EROFS_FS_ZIP
- static const struct address_space_operations managed_cache_aops;
- static int erofs_managed_cache_releasepage(struct page *page, gfp_t gfp_mask)
- {
- int ret = 1; /* 0 - busy */
- struct address_space *const mapping = page->mapping;
- DBG_BUGON(!PageLocked(page));
- DBG_BUGON(mapping->a_ops != &managed_cache_aops);
- if (PagePrivate(page))
- ret = erofs_try_to_free_cached_page(mapping, page);
- return ret;
- }
- static void erofs_managed_cache_invalidatepage(struct page *page,
- unsigned int offset,
- unsigned int length)
- {
- const unsigned int stop = length + offset;
- DBG_BUGON(!PageLocked(page));
- /* Check for potential overflow in debug mode */
- DBG_BUGON(stop > PAGE_SIZE || stop < length);
- if (offset == 0 && stop == PAGE_SIZE)
- while (!erofs_managed_cache_releasepage(page, GFP_NOFS))
- cond_resched();
- }
- static const struct address_space_operations managed_cache_aops = {
- .releasepage = erofs_managed_cache_releasepage,
- .invalidatepage = erofs_managed_cache_invalidatepage,
- };
- static int erofs_init_managed_cache(struct super_block *sb)
- {
- struct erofs_sb_info *const sbi = EROFS_SB(sb);
- struct inode *const inode = new_inode(sb);
- if (!inode)
- return -ENOMEM;
- set_nlink(inode, 1);
- inode->i_size = OFFSET_MAX;
- inode->i_mapping->a_ops = &managed_cache_aops;
- mapping_set_gfp_mask(inode->i_mapping,
- GFP_NOFS | __GFP_HIGHMEM | __GFP_MOVABLE);
- sbi->managed_cache = inode;
- return 0;
- }
- #else
- static int erofs_init_managed_cache(struct super_block *sb) { return 0; }
- #endif
- static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
- {
- struct inode *inode;
- struct erofs_sb_info *sbi;
- struct erofs_fs_context *ctx = fc->fs_private;
- int err;
- sb->s_magic = EROFS_SUPER_MAGIC;
- if (!sb_set_blocksize(sb, EROFS_BLKSIZ)) {
- erofs_err(sb, "failed to set erofs blksize");
- return -EINVAL;
- }
- sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
- if (!sbi)
- return -ENOMEM;
- sb->s_fs_info = sbi;
- err = erofs_read_superblock(sb);
- if (err)
- return err;
- sb->s_flags |= SB_RDONLY | SB_NOATIME;
- sb->s_maxbytes = MAX_LFS_FILESIZE;
- sb->s_time_gran = 1;
- sb->s_op = &erofs_sops;
- sb->s_xattr = erofs_xattr_handlers;
- if (test_opt(ctx, POSIX_ACL))
- sb->s_flags |= SB_POSIXACL;
- else
- sb->s_flags &= ~SB_POSIXACL;
- sbi->ctx = *ctx;
- #ifdef CONFIG_EROFS_FS_ZIP
- xa_init(&sbi->managed_pslots);
- #endif
- /* get the root inode */
- inode = erofs_iget(sb, ROOT_NID(sbi), true);
- if (IS_ERR(inode))
- return PTR_ERR(inode);
- if (!S_ISDIR(inode->i_mode)) {
- erofs_err(sb, "rootino(nid %llu) is not a directory(i_mode %o)",
- ROOT_NID(sbi), inode->i_mode);
- iput(inode);
- return -EINVAL;
- }
- sb->s_root = d_make_root(inode);
- if (!sb->s_root)
- return -ENOMEM;
- erofs_shrinker_register(sb);
- /* sb->s_umount is already locked, SB_ACTIVE and SB_BORN are not set */
- err = erofs_init_managed_cache(sb);
- if (err)
- return err;
- erofs_info(sb, "mounted with root inode @ nid %llu.", ROOT_NID(sbi));
- return 0;
- }
- static int erofs_fc_get_tree(struct fs_context *fc)
- {
- return get_tree_bdev(fc, erofs_fc_fill_super);
- }
- static int erofs_fc_reconfigure(struct fs_context *fc)
- {
- struct super_block *sb = fc->root->d_sb;
- struct erofs_sb_info *sbi = EROFS_SB(sb);
- struct erofs_fs_context *ctx = fc->fs_private;
- DBG_BUGON(!sb_rdonly(sb));
- if (test_opt(ctx, POSIX_ACL))
- fc->sb_flags |= SB_POSIXACL;
- else
- fc->sb_flags &= ~SB_POSIXACL;
- sbi->ctx = *ctx;
- fc->sb_flags |= SB_RDONLY;
- return 0;
- }
- static void erofs_fc_free(struct fs_context *fc)
- {
- kfree(fc->fs_private);
- }
- static const struct fs_context_operations erofs_context_ops = {
- .parse_param = erofs_fc_parse_param,
- .get_tree = erofs_fc_get_tree,
- .reconfigure = erofs_fc_reconfigure,
- .free = erofs_fc_free,
- };
- static int erofs_init_fs_context(struct fs_context *fc)
- {
- fc->fs_private = kzalloc(sizeof(struct erofs_fs_context), GFP_KERNEL);
- if (!fc->fs_private)
- return -ENOMEM;
- /* set default mount options */
- erofs_default_options(fc->fs_private);
- fc->ops = &erofs_context_ops;
- return 0;
- }
- /*
- * could be triggered after deactivate_locked_super()
- * is called, thus including umount and failed to initialize.
- */
- static void erofs_kill_sb(struct super_block *sb)
- {
- struct erofs_sb_info *sbi;
- WARN_ON(sb->s_magic != EROFS_SUPER_MAGIC);
- kill_block_super(sb);
- sbi = EROFS_SB(sb);
- if (!sbi)
- return;
- kfree(sbi);
- sb->s_fs_info = NULL;
- }
- /* called when ->s_root is non-NULL */
- static void erofs_put_super(struct super_block *sb)
- {
- struct erofs_sb_info *const sbi = EROFS_SB(sb);
- DBG_BUGON(!sbi);
- erofs_shrinker_unregister(sb);
- #ifdef CONFIG_EROFS_FS_ZIP
- iput(sbi->managed_cache);
- sbi->managed_cache = NULL;
- #endif
- }
- static struct file_system_type erofs_fs_type = {
- .owner = THIS_MODULE,
- .name = "erofs",
- .init_fs_context = erofs_init_fs_context,
- .kill_sb = erofs_kill_sb,
- .fs_flags = FS_REQUIRES_DEV,
- };
- MODULE_ALIAS_FS("erofs");
- static int __init erofs_module_init(void)
- {
- int err;
- erofs_check_ondisk_layout_definitions();
- erofs_inode_cachep = kmem_cache_create("erofs_inode",
- sizeof(struct erofs_inode), 0,
- SLAB_RECLAIM_ACCOUNT,
- erofs_inode_init_once);
- if (!erofs_inode_cachep) {
- err = -ENOMEM;
- goto icache_err;
- }
- err = erofs_init_shrinker();
- if (err)
- goto shrinker_err;
- erofs_pcpubuf_init();
- err = z_erofs_init_zip_subsystem();
- if (err)
- goto zip_err;
- err = register_filesystem(&erofs_fs_type);
- if (err)
- goto fs_err;
- return 0;
- fs_err:
- z_erofs_exit_zip_subsystem();
- zip_err:
- erofs_exit_shrinker();
- shrinker_err:
- kmem_cache_destroy(erofs_inode_cachep);
- icache_err:
- return err;
- }
- static void __exit erofs_module_exit(void)
- {
- unregister_filesystem(&erofs_fs_type);
- z_erofs_exit_zip_subsystem();
- erofs_exit_shrinker();
- /* Ensure all RCU free inodes are safe before cache is destroyed. */
- rcu_barrier();
- kmem_cache_destroy(erofs_inode_cachep);
- erofs_pcpubuf_exit();
- }
- /* get filesystem statistics */
- static int erofs_statfs(struct dentry *dentry, struct kstatfs *buf)
- {
- struct super_block *sb = dentry->d_sb;
- struct erofs_sb_info *sbi = EROFS_SB(sb);
- u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
- buf->f_type = sb->s_magic;
- buf->f_bsize = EROFS_BLKSIZ;
- buf->f_blocks = sbi->blocks;
- buf->f_bfree = buf->f_bavail = 0;
- buf->f_files = ULLONG_MAX;
- buf->f_ffree = ULLONG_MAX - sbi->inos;
- buf->f_namelen = EROFS_NAME_LEN;
- buf->f_fsid = u64_to_fsid(id);
- return 0;
- }
- static int erofs_show_options(struct seq_file *seq, struct dentry *root)
- {
- struct erofs_sb_info *sbi __maybe_unused = EROFS_SB(root->d_sb);
- struct erofs_fs_context *ctx __maybe_unused = &sbi->ctx;
- #ifdef CONFIG_EROFS_FS_XATTR
- if (test_opt(ctx, XATTR_USER))
- seq_puts(seq, ",user_xattr");
- else
- seq_puts(seq, ",nouser_xattr");
- #endif
- #ifdef CONFIG_EROFS_FS_POSIX_ACL
- if (test_opt(ctx, POSIX_ACL))
- seq_puts(seq, ",acl");
- else
- seq_puts(seq, ",noacl");
- #endif
- #ifdef CONFIG_EROFS_FS_ZIP
- if (ctx->cache_strategy == EROFS_ZIP_CACHE_DISABLED)
- seq_puts(seq, ",cache_strategy=disabled");
- else if (ctx->cache_strategy == EROFS_ZIP_CACHE_READAHEAD)
- seq_puts(seq, ",cache_strategy=readahead");
- else if (ctx->cache_strategy == EROFS_ZIP_CACHE_READAROUND)
- seq_puts(seq, ",cache_strategy=readaround");
- #endif
- return 0;
- }
- const struct super_operations erofs_sops = {
- .put_super = erofs_put_super,
- .alloc_inode = erofs_alloc_inode,
- .free_inode = erofs_free_inode,
- .statfs = erofs_statfs,
- .show_options = erofs_show_options,
- };
- module_init(erofs_module_init);
- module_exit(erofs_module_exit);
- MODULE_DESCRIPTION("Enhanced ROM File System");
- MODULE_AUTHOR("Gao Xiang, Chao Yu, Miao Xie, CONSUMER BG, HUAWEI Inc.");
- MODULE_LICENSE("GPL");
- MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
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