mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
230 lines
6.5 KiB
230 lines
6.5 KiB
/* 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); |
|
}
|
|
|