1 #ifndef KVM__DISK_IMAGE_H 2 #define KVM__DISK_IMAGE_H 3 4 #include "kvm/read-write.h" 5 #include "kvm/util.h" 6 7 #include <linux/types.h> 8 #include <linux/fs.h> /* for BLKGETSIZE64 */ 9 #include <sys/ioctl.h> 10 #include <sys/types.h> 11 #include <sys/mman.h> 12 #include <sys/stat.h> 13 #include <stdbool.h> 14 #include <sys/uio.h> 15 #include <stdbool.h> 16 #include <stddef.h> 17 #include <stdlib.h> 18 #include <unistd.h> 19 #include <fcntl.h> 20 21 #define SECTOR_SHIFT 9 22 #define SECTOR_SIZE (1UL << SECTOR_SHIFT) 23 24 enum { 25 DISK_IMAGE_REGULAR, 26 DISK_IMAGE_MMAP, 27 }; 28 29 #define MAX_DISK_IMAGES 4 30 31 struct disk_image; 32 33 struct disk_image_operations { 34 /* 35 * The following two are used for reading or writing with a single buffer. 36 * The implentation can use readv/writev or memcpy. 37 */ 38 ssize_t (*read_sector)(struct disk_image *disk, u64 sector, void *dst, u32 dst_len); 39 ssize_t (*write_sector)(struct disk_image *disk, u64 sector, void *src, u32 src_len); 40 /* 41 * The following two are used for reading or writing with multiple buffers. 42 * The implentation can use readv/writev or memcpy. 43 */ 44 ssize_t (*read_sector_iov)(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount); 45 ssize_t (*write_sector_iov)(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount); 46 int (*flush)(struct disk_image *disk); 47 int (*close)(struct disk_image *disk); 48 }; 49 50 struct disk_image { 51 int fd; 52 u64 size; 53 struct disk_image_operations *ops; 54 void *priv; 55 }; 56 57 struct disk_image *disk_image__open(const char *filename, bool readonly); 58 struct disk_image **disk_image__open_all(const char **filenames, bool *readonly, int count); 59 struct disk_image *disk_image__new(int fd, u64 size, struct disk_image_operations *ops, int mmap); 60 int disk_image__close(struct disk_image *disk); 61 void disk_image__close_all(struct disk_image **disks, int count); 62 int disk_image__flush(struct disk_image *disk); 63 ssize_t disk_image__read(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount); 64 ssize_t disk_image__write(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount); 65 ssize_t disk_image__get_serial(struct disk_image *disk, void *buffer, ssize_t *len); 66 67 struct disk_image *raw_image__probe(int fd, struct stat *st, bool readonly); 68 struct disk_image *blkdev__probe(const char *filename, struct stat *st); 69 70 ssize_t raw_image__read_sector_iov(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount); 71 ssize_t raw_image__write_sector_iov(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount); 72 ssize_t raw_image__read_sector(struct disk_image *disk, u64 sector, void *dst, u32 dst_len); 73 ssize_t raw_image__write_sector(struct disk_image *disk, u64 sector, void *src, u32 src_len); 74 int raw_image__close(struct disk_image *disk); 75 76 #endif /* KVM__DISK_IMAGE_H */ 77