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 #define DISK_IMAGE_MMAP 0 25 #define DISK_IMAGE_NOMMAP 1 26 27 struct disk_image; 28 29 struct disk_image_operations { 30 /* 31 * The following two are used for reading or writing with a single buffer. 32 * The implentation can use readv/writev or memcpy. 33 */ 34 ssize_t (*read_sector)(struct disk_image *disk, u64 sector, void *dst, u32 dst_len); 35 ssize_t (*write_sector)(struct disk_image *disk, u64 sector, void *src, u32 src_len); 36 /* 37 * The following two are used for reading or writing with multiple buffers. 38 * The implentation can use readv/writev or memcpy. 39 */ 40 ssize_t (*read_sector_iov)(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount); 41 ssize_t (*write_sector_iov)(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount); 42 int (*flush)(struct disk_image *disk); 43 int (*close)(struct disk_image *disk); 44 }; 45 46 struct disk_image { 47 int fd; 48 u64 size; 49 struct disk_image_operations *ops; 50 void *priv; 51 }; 52 53 struct disk_image *disk_image__open(const char *filename, bool readonly); 54 struct disk_image *disk_image__new(int fd, u64 size, struct disk_image_operations *ops, int mmap); 55 int disk_image__close(struct disk_image *disk); 56 57 ssize_t disk_image__read(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount); 58 ssize_t disk_image__write(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount); 59 60 static inline int disk_image__flush(struct disk_image *disk) 61 { 62 if (disk->ops->flush) 63 return disk->ops->flush(disk); 64 return fsync(disk->fd); 65 } 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