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/* SPDX-License-Identifier: GPL-2.0 */
#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 */
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 */
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 const struct adfs_dir_ops adfs_f_dir_ops;
extern const 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);
}
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