1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Squashfs - a compressed read only filesystem for Linux 4 * 5 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 6 * Phillip Lougher <[email protected]> 7 * 8 * squashfs.h 9 */ 10 11 #define TRACE(s, args...) pr_debug("SQUASHFS: "s, ## args) 12 13 #define ERROR(s, args...) pr_err("SQUASHFS error: "s, ## args) 14 15 #define WARNING(s, args...) pr_warn("SQUASHFS: "s, ## args) 16 17 #ifdef CONFIG_SQUASHFS_FILE_CACHE 18 #define SQUASHFS_READ_PAGES msblk->max_thread_num 19 #else 20 #define SQUASHFS_READ_PAGES 0 21 #endif 22 23 /* block.c */ 24 extern int squashfs_read_data(struct super_block *, u64, int, u64 *, 25 struct squashfs_page_actor *); 26 27 /* cache.c */ 28 extern struct squashfs_cache *squashfs_cache_init(char *, int, int); 29 extern void squashfs_cache_delete(struct squashfs_cache *); 30 extern struct squashfs_cache_entry *squashfs_cache_get(struct super_block *, 31 struct squashfs_cache *, u64, int); 32 extern void squashfs_cache_put(struct squashfs_cache_entry *); 33 extern int squashfs_copy_data(void *, struct squashfs_cache_entry *, int, int); 34 extern int squashfs_read_metadata(struct super_block *, void *, u64 *, 35 int *, int); 36 extern struct squashfs_cache_entry *squashfs_get_fragment(struct super_block *, 37 u64, int); 38 extern struct squashfs_cache_entry *squashfs_get_datablock(struct super_block *, 39 u64, int); 40 extern void *squashfs_read_table(struct super_block *, u64, int); 41 42 /* decompressor.c */ 43 extern const struct squashfs_decompressor *squashfs_lookup_decompressor(int); 44 extern void *squashfs_decompressor_setup(struct super_block *, unsigned short); 45 46 /* decompressor_xxx.c */ 47 48 struct squashfs_decompressor_thread_ops { 49 void * (*create)(struct squashfs_sb_info *msblk, void *comp_opts); 50 void (*destroy)(struct squashfs_sb_info *msblk); 51 int (*decompress)(struct squashfs_sb_info *msblk, struct bio *bio, 52 int offset, int length, struct squashfs_page_actor *output); 53 int (*max_decompressors)(void); 54 }; 55 56 #ifdef CONFIG_SQUASHFS_DECOMP_SINGLE 57 extern const struct squashfs_decompressor_thread_ops squashfs_decompressor_single; 58 #endif 59 #ifdef CONFIG_SQUASHFS_DECOMP_MULTI 60 extern const struct squashfs_decompressor_thread_ops squashfs_decompressor_multi; 61 #endif 62 #ifdef CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU 63 extern const struct squashfs_decompressor_thread_ops squashfs_decompressor_percpu; 64 #endif 65 66 /* export.c */ 67 extern __le64 *squashfs_read_inode_lookup_table(struct super_block *, u64, u64, 68 unsigned int); 69 70 /* fragment.c */ 71 extern int squashfs_frag_lookup(struct super_block *, unsigned int, u64 *); 72 extern __le64 *squashfs_read_fragment_index_table(struct super_block *, 73 u64, u64, unsigned int); 74 75 /* file.c */ 76 void squashfs_copy_cache(struct folio *, struct squashfs_cache_entry *, 77 size_t bytes, size_t offset); 78 79 /* file_xxx.c */ 80 int squashfs_readpage_block(struct folio *, u64 block, int bsize, int expected); 81 82 /* id.c */ 83 extern int squashfs_get_id(struct super_block *, unsigned int, unsigned int *); 84 extern __le64 *squashfs_read_id_index_table(struct super_block *, u64, u64, 85 unsigned short); 86 87 /* inode.c */ 88 extern struct inode *squashfs_iget(struct super_block *, long long, 89 unsigned int); 90 extern int squashfs_read_inode(struct inode *, long long); 91 92 /* xattr.c */ 93 extern ssize_t squashfs_listxattr(struct dentry *, char *, size_t); 94 95 /* 96 * Inodes, files, decompressor and xattr operations 97 */ 98 99 /* dir.c */ 100 extern const struct file_operations squashfs_dir_ops; 101 102 /* export.c */ 103 extern const struct export_operations squashfs_export_ops; 104 105 /* file.c */ 106 extern const struct address_space_operations squashfs_aops; 107 108 /* inode.c */ 109 extern const struct inode_operations squashfs_inode_ops; 110 111 /* namei.c */ 112 extern const struct inode_operations squashfs_dir_inode_ops; 113 114 /* symlink.c */ 115 extern const struct address_space_operations squashfs_symlink_aops; 116 extern const struct inode_operations squashfs_symlink_inode_ops; 117 118 /* xattr.c */ 119 extern const struct xattr_handler * const squashfs_xattr_handlers[]; 120