231 строка
6.5 KiB
C
231 строка
6.5 KiB
C
/* 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 user_namespace *mnt_userns, 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);
|
|
}
|