#ifndef _SYS_DECMPFS_H_
#define _SYS_DECMPFS_H_ 1
#include <sys/kernel_types.h>
#include <stdbool.h>
#include <sys/vnode.h>
#define MAX_DECMPFS_XATTR_SIZE 3802
#define DECMPFS_MAGIC 0x636d7066
#define DECMPFS_XATTR_NAME "com.apple.decmpfs"
typedef struct __attribute__((packed)) {
uint32_t compression_magic;
uint32_t compression_type;
uint64_t uncompressed_size;
unsigned char attr_bytes[0];
} decmpfs_disk_header;
typedef struct __attribute__((packed)) {
uint32_t attr_size;
uint32_t compression_magic;
uint32_t compression_type;
uint64_t uncompressed_size;
unsigned char attr_bytes[0];
} decmpfs_header;
enum {
CMP_Type1 = 1,
CMP_MAX = 255
};
typedef struct {
void *buf;
user_ssize_t size;
} decmpfs_vector;
#ifdef KERNEL
#ifdef XNU_KERNEL_PRIVATE
#include <kern/locks.h>
struct decmpfs_cnode {
uint8_t cmp_state;
uint8_t cmp_minimal_xattr;
uint32_t cmp_type;
uint32_t lockcount;
void *lockowner;
uint64_t uncompressed_size __attribute__((aligned(8)));
uint64_t decompression_flags;
lck_rw_t compressed_data_lock;
};
#endif // XNU_KERNEL_PRIVATE
typedef struct decmpfs_cnode decmpfs_cnode;
enum {
FILE_TYPE_UNKNOWN = 0,
FILE_IS_NOT_COMPRESSED = 1,
FILE_IS_COMPRESSED = 2,
FILE_IS_CONVERTING = 3
};
extern vfs_context_t decmpfs_ctx;
void decmpfs_init(void);
decmpfs_cnode *decmpfs_cnode_alloc(void);
void decmpfs_cnode_free(decmpfs_cnode *dp);
void decmpfs_cnode_init(decmpfs_cnode *cp);
void decmpfs_cnode_destroy(decmpfs_cnode *cp);
int decmpfs_hides_rsrc(vfs_context_t ctx, decmpfs_cnode *cp);
int decmpfs_hides_xattr(vfs_context_t ctx, decmpfs_cnode *cp, const char *xattr);
bool decmpfs_trylock_compressed_data(decmpfs_cnode *cp, int exclusive);
void decmpfs_lock_compressed_data(decmpfs_cnode *cp, int exclusive);
void decmpfs_unlock_compressed_data(decmpfs_cnode *cp, int exclusive);
uint32_t decmpfs_cnode_get_vnode_state(decmpfs_cnode *cp);
void decmpfs_cnode_set_vnode_state(decmpfs_cnode *cp, uint32_t state, int skiplock);
uint64_t decmpfs_cnode_get_vnode_cached_size(decmpfs_cnode *cp);
uint32_t decmpfs_cnode_cmp_type(decmpfs_cnode *cp);
int decmpfs_file_is_compressed(vnode_t vp, decmpfs_cnode *cp);
errno_t decmpfs_validate_compressed_file(vnode_t vp, decmpfs_cnode *cp);
int decmpfs_decompress_file(vnode_t vp, decmpfs_cnode *cp, off_t toSize, int truncate_okay, int skiplock);
int decmpfs_free_compressed_data(vnode_t vp, decmpfs_cnode *cp);
int decmpfs_update_attributes(vnode_t vp, struct vnode_attr *vap);
errno_t decmpfs_pagein_compressed(struct vnop_pagein_args *ap, int *is_compressed, decmpfs_cnode *cp);
errno_t decmpfs_read_compressed(struct vnop_read_args *ap, int *is_compressed, decmpfs_cnode *cp);
typedef int (*decmpfs_validate_compressed_file_func)(vnode_t vp, vfs_context_t ctx, decmpfs_header *hdr);
typedef void (*decmpfs_adjust_fetch_region_func)(vnode_t vp, vfs_context_t ctx, decmpfs_header *hdr, off_t *offset, user_ssize_t *size);
typedef int (*decmpfs_fetch_uncompressed_data_func)(vnode_t vp, vfs_context_t ctx, decmpfs_header *hdr, off_t offset, user_ssize_t size, int nvec, decmpfs_vector *vec, uint64_t *bytes_read);
typedef int (*decmpfs_free_compressed_data_func)(vnode_t vp, vfs_context_t ctx, decmpfs_header *hdr);
typedef uint64_t (*decmpfs_get_decompression_flags_func)(vnode_t vp, vfs_context_t ctx, decmpfs_header *hdr);
enum {
DECMPFS_FLAGS_FORCE_FLUSH_ON_DECOMPRESS = 1 << 0,
};
#define DECMPFS_REGISTRATION_VERSION_V1 1
#define DECMPFS_REGISTRATION_VERSION_V3 3
#define DECMPFS_REGISTRATION_VERSION (DECMPFS_REGISTRATION_VERSION_V3)
typedef struct {
int decmpfs_registration;
decmpfs_validate_compressed_file_func validate;
decmpfs_adjust_fetch_region_func adjust_fetch;
decmpfs_fetch_uncompressed_data_func fetch;
decmpfs_free_compressed_data_func free_data;
decmpfs_get_decompression_flags_func get_flags;
} decmpfs_registration;
errno_t register_decmpfs_decompressor(uint32_t compression_type, const decmpfs_registration *registration);
errno_t unregister_decmpfs_decompressor(uint32_t compression_type, decmpfs_registration *registration);
#endif
#endif