/* SPDX-License-Identifier: GPL-2.0 */ #include <linux/buffer_head.h> #include <linux/fs.h> #include <linux/adfs_fs.h> /* Internal data structures for ADFS */ #define ADFS_FREE_FRAG 0 #define ADFS_BAD_FRAG 1 #define ADFS_ROOT_FRAG 2 #define ADFS_FILETYPE_NONE ((u16)~0) /* RISC OS 12-bit filetype is stored in load_address[19:8] */ static inline u16 adfs_filetype(u32 loadaddr) { return (loadaddr & 0xfff00000) == 0xfff00000 ? (loadaddr >> 8) & 0xfff : ADFS_FILETYPE_NONE; } #define ADFS_NDA_OWNER_READ (1 << 0) #define ADFS_NDA_OWNER_WRITE (1 << 1) #define ADFS_NDA_LOCKED (1 << 2) #define ADFS_NDA_DIRECTORY (1 << 3) #define ADFS_NDA_EXECUTE (1 << 4) #define ADFS_NDA_PUBLIC_READ (1 << 5) #define ADFS_NDA_PUBLIC_WRITE (1 << 6) /* * adfs file system inode data in memory */ struct adfs_inode_info { loff_t mmu_private; __u32 parent_id; /* parent indirect disc address */ __u32 indaddr; /* object indirect disc address */ __u32 loadaddr; /* RISC OS load address */ __u32 execaddr; /* RISC OS exec address */ unsigned int attr; /* RISC OS permissions */ struct inode vfs_inode; }; static inline struct adfs_inode_info *ADFS_I(struct inode *inode) { return container_of(inode, struct adfs_inode_info, vfs_inode); } static inline bool adfs_inode_is_stamped(struct inode *inode) { return (ADFS_I(inode)->loadaddr & 0xfff00000) == 0xfff00000; } /* * Forward-declare this */ struct adfs_discmap; struct adfs_dir_ops; /* * ADFS file system superblock data in memory */ struct adfs_sb_info { union { struct { struct adfs_discmap *s_map; /* bh list containing map */ const struct adfs_dir_ops *s_dir; /* directory operations */ }; struct rcu_head rcu; /* used only at shutdown time */ }; kuid_t s_uid; /* owner uid */ kgid_t s_gid; /* owner gid */ umode_t s_owner_mask; /* ADFS owner perm -> unix perm */ umode_t s_other_mask; /* ADFS other perm -> unix perm */ int s_ftsuffix; /* ,xyz hex filetype suffix option */ __u32 s_ids_per_zone; /* max. no ids in one zone */ __u32 s_idlen; /* length of ID in map */ __u32 s_map_size; /* sector size of a map */ signed int s_map2blk; /* shift left by this for map->sector*/ unsigned int s_log2sharesize;/* log2 share size */ unsigned int s_namelen; /* maximum number of characters in name */ }; static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb) { return sb->s_fs_info; } /* * Directory handling */ struct adfs_dir { struct super_block *sb; int nr_buffers; struct buffer_head *bh[4]; struct buffer_head **bhs; unsigned int pos; __u32 parent_id; union { struct adfs_dirheader *dirhead; struct adfs_bigdirheader *bighead; }; union { struct adfs_newdirtail *newtail; struct adfs_bigdirtail *bigtail; }; }; /* * This is the overall maximum name length */ #define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */ struct object_info { __u32 parent_id; /* parent object id */ __u32 indaddr; /* indirect disc addr */ __u32 loadaddr; /* load address */ __u32 execaddr; /* execution address */ __u32 size; /* size */ __u8 attr; /* RISC OS attributes */ unsigned int name_len; /* name length */ char name[ADFS_MAX_NAME_LEN];/* file name */ }; struct adfs_dir_ops { int (*read)(struct super_block *sb, unsigned int indaddr, unsigned int size, struct adfs_dir *dir); int (*iterate)(struct adfs_dir *dir, struct dir_context *ctx); int (*setpos)(struct adfs_dir *dir, unsigned int fpos); int (*getnext)(struct adfs_dir *dir, struct object_info *obj); int (*update)(struct adfs_dir *dir, struct object_info *obj); int (*create)(struct adfs_dir *dir, struct object_info *obj); int (*remove)(struct adfs_dir *dir, struct object_info *obj); int (*commit)(struct adfs_dir *dir); }; struct adfs_discmap { struct buffer_head *dm_bh; __u32 dm_startblk; unsigned int dm_startbit; unsigned int dm_endbit; }; /* Inode stuff */ struct inode *adfs_iget(struct super_block *sb, struct object_info *obj); int adfs_write_inode(struct inode *inode, struct writeback_control *wbc); int adfs_notify_change(struct dentry *dentry, struct iattr *attr); /* map.c */ int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset); void adfs_map_statfs(struct super_block *sb, struct kstatfs *buf); struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr); void adfs_free_map(struct super_block *sb); /* Misc */ __printf(3, 4) void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...); #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt) void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...); /* super.c */ /* * Inodes and file operations */ /* dir_*.c */ extern const struct inode_operations adfs_dir_inode_operations; extern const struct file_operations adfs_dir_operations; extern const struct dentry_operations adfs_dentry_operations; extern const struct adfs_dir_ops adfs_f_dir_ops; extern const struct adfs_dir_ops adfs_fplus_dir_ops; int adfs_dir_copyfrom(void *dst, struct adfs_dir *dir, unsigned int offset, size_t len); int adfs_dir_copyto(struct adfs_dir *dir, unsigned int offset, const void *src, size_t len); void adfs_dir_relse(struct adfs_dir *dir); int adfs_dir_read_buffers(struct super_block *sb, u32 indaddr, unsigned int size, struct adfs_dir *dir); void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj); extern int adfs_dir_update(struct super_block *sb, struct object_info *obj, int wait); /* file.c */ extern const struct inode_operations adfs_file_inode_operations; extern const struct file_operations adfs_file_operations; static inline __u32 signed_asl(__u32 val, signed int shift) { if (shift >= 0) val <<= shift; else val >>= -shift; return val; } /* * Calculate the address of a block in an object given the block offset * and the object identity. * * The root directory ID should always be looked up in the map [3.4] */ static inline int __adfs_block_map(struct super_block *sb, u32 indaddr, unsigned int block) { if (indaddr & 255) { unsigned int off; off = (indaddr & 255) - 1; block += off << ADFS_SB(sb)->s_log2sharesize; } return adfs_map_lookup(sb, indaddr >> 8, block); } /* Return the disc record from the map */ static inline struct adfs_discrecord *adfs_map_discrecord(struct adfs_discmap *dm) { return (void *)(dm[0].dm_bh->b_data + 4); } static inline u64 adfs_disc_size(const struct adfs_discrecord *dr) { return (u64)le32_to_cpu(dr->disc_size_high) << 32 | le32_to_cpu(dr->disc_size); }