diff options
Diffstat (limited to 'fs/adfs/adfs.h')
| -rw-r--r-- | fs/adfs/adfs.h | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/fs/adfs/adfs.h b/fs/adfs/adfs.h new file mode 100644 index 000000000..24575d9d8 --- /dev/null +++ b/fs/adfs/adfs.h @@ -0,0 +1,208 @@ +#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_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) + +#include "dir_f.h" + +struct buffer_head; + +/* + * adfs file system inode data in memory + */ +struct adfs_inode_info { + loff_t mmu_private; + unsigned long parent_id; /* object id of parent */ + __u32 loadaddr; /* RISC OS load address */ + __u32 execaddr; /* RISC OS exec address */ + unsigned int filetype; /* RISC OS file type */ + unsigned int attr; /* RISC OS permissions */ + unsigned int stamped:1; /* RISC OS file has date/time */ + struct inode vfs_inode; +}; + +/* + * 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 */ + 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 */ + unsigned long s_size; /* total size (in blocks) of this fs */ + signed int s_map2blk; /* shift left by this for map->sector */ + unsigned int s_log2sharesize;/* log2 share size */ + __le32 s_version; /* disc format version */ + 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; +} + +static inline struct adfs_inode_info *ADFS_I(struct inode *inode) +{ + return container_of(inode, struct adfs_inode_info, vfs_inode); +} + +/* + * Directory handling + */ +struct adfs_dir { + struct super_block *sb; + + int nr_buffers; + struct buffer_head *bh[4]; + + /* big directories need allocated buffers */ + struct buffer_head **bh_fplus; + + unsigned int pos; + unsigned int parent_id; + + struct adfs_dirheader dirhead; + union adfs_dirtail dirtail; +}; + +/* + * 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 file_id; /* object id */ + __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 */ + + /* RISC OS file type (12-bit: derived from loadaddr) */ + __u16 filetype; +}; + +/* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */ +static inline int append_filetype_suffix(char *buf, __u16 filetype) +{ + if (filetype == 0xffff) /* no explicit 12-bit file type was set */ + return 0; + + *buf++ = ','; + *buf++ = hex_asc_lo(filetype >> 8); + *buf++ = hex_asc_lo(filetype >> 4); + *buf++ = hex_asc_lo(filetype >> 0); + return 4; +} + +struct adfs_dir_ops { + int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir); + 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 (*sync)(struct adfs_dir *dir); + void (*free)(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 */ +extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset); +extern unsigned int adfs_map_free(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) + +/* 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 struct adfs_dir_ops adfs_f_dir_ops; +extern struct adfs_dir_ops adfs_fplus_dir_ops; + +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, unsigned int object_id, + unsigned int block) +{ + if (object_id & 255) { + unsigned int off; + + off = (object_id & 255) - 1; + block += off << ADFS_SB(sb)->s_log2sharesize; + } + + return adfs_map_lookup(sb, object_id >> 8, block); +} |