19f532d00SPekka Enberg #ifndef KVM__DISK_IMAGE_H 29f532d00SPekka Enberg #define KVM__DISK_IMAGE_H 39f532d00SPekka Enberg 43fdf659dSSasha Levin #include <linux/types.h> 59ac38fe1SSasha Levin #include <stdbool.h> 670b53f25SSasha Levin #include <sys/uio.h> 79f532d00SPekka Enberg 82924f993SAsias He #define SECTOR_SHIFT 9 92924f993SAsias He #define SECTOR_SIZE (1UL << SECTOR_SHIFT) 102924f993SAsias He 11499f3bedSPekka Enberg struct disk_image; 12499f3bedSPekka Enberg 13499f3bedSPekka Enberg struct disk_image_operations { 1443835ac9SSasha Levin int (*read_sector)(struct disk_image *disk, u64 sector, void *dst, u32 dst_len); 1543835ac9SSasha Levin int (*write_sector)(struct disk_image *disk, u64 sector, void *src, u32 src_len); 1643835ac9SSasha Levin ssize_t (*read_sector_iov)(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount); 1743835ac9SSasha Levin ssize_t (*write_sector_iov)(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount); 1843835ac9SSasha Levin void (*close)(struct disk_image *disk); 19499f3bedSPekka Enberg }; 20499f3bedSPekka Enberg 219f532d00SPekka Enberg struct disk_image { 229f532d00SPekka Enberg int fd; 233fdf659dSSasha Levin u64 size; 24499f3bedSPekka Enberg struct disk_image_operations *ops; 25499f3bedSPekka Enberg void *priv; 269f532d00SPekka Enberg }; 279f532d00SPekka Enberg 289ac38fe1SSasha Levin struct disk_image *disk_image__open(const char *filename, bool readonly); 293fdf659dSSasha Levin struct disk_image *disk_image__new(int fd, u64 size, struct disk_image_operations *ops); 303fdf659dSSasha Levin struct disk_image *disk_image__new_readonly(int fd, u64 size, struct disk_image_operations *ops); 3143835ac9SSasha Levin void disk_image__close(struct disk_image *disk); 32499f3bedSPekka Enberg 3343835ac9SSasha Levin static inline int disk_image__read_sector(struct disk_image *disk, u64 sector, void *dst, u32 dst_len) 34499f3bedSPekka Enberg { 3543835ac9SSasha Levin return disk->ops->read_sector(disk, sector, dst, dst_len); 36499f3bedSPekka Enberg } 37499f3bedSPekka Enberg 3843835ac9SSasha Levin static inline int disk_image__write_sector(struct disk_image *disk, u64 sector, void *src, u32 src_len) 39499f3bedSPekka Enberg { 4043835ac9SSasha Levin return disk->ops->write_sector(disk, sector, src, src_len); 41499f3bedSPekka Enberg } 429f532d00SPekka Enberg 4343835ac9SSasha Levin static inline ssize_t disk_image__read_sector_iov(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount) 4470b53f25SSasha Levin { 4543835ac9SSasha Levin if (disk->ops->read_sector_iov) 4643835ac9SSasha Levin return disk->ops->read_sector_iov(disk, sector, iov, iovcount); 4770b53f25SSasha Levin 4870b53f25SSasha Levin while (iovcount--) { 49*f10860caSPekka Enberg if (disk->ops->read_sector(disk, sector, iov->iov_base, iov->iov_len) < 0) 50*f10860caSPekka Enberg return -1; 51*f10860caSPekka Enberg 5270b53f25SSasha Levin sector += iov->iov_len >> SECTOR_SHIFT; 5370b53f25SSasha Levin iov++; 5470b53f25SSasha Levin } 5570b53f25SSasha Levin 5670b53f25SSasha Levin return sector << SECTOR_SHIFT; 5770b53f25SSasha Levin } 5870b53f25SSasha Levin 5943835ac9SSasha Levin static inline ssize_t disk_image__write_sector_iov(struct disk_image *disk, u64 sector, const struct iovec *iov, int iovcount) 6070b53f25SSasha Levin { 6143835ac9SSasha Levin if (disk->ops->write_sector_iov) 6243835ac9SSasha Levin return disk->ops->write_sector_iov(disk, sector, iov, iovcount); 6370b53f25SSasha Levin 6470b53f25SSasha Levin while (iovcount--) { 65*f10860caSPekka Enberg if (disk->ops->write_sector(disk, sector, iov->iov_base, iov->iov_len) < 0) 66*f10860caSPekka Enberg return -1; 67*f10860caSPekka Enberg 6870b53f25SSasha Levin sector += iov->iov_len >> SECTOR_SHIFT; 6970b53f25SSasha Levin iov++; 7070b53f25SSasha Levin } 7170b53f25SSasha Levin 7270b53f25SSasha Levin return sector << SECTOR_SHIFT; 7370b53f25SSasha Levin } 7470b53f25SSasha Levin 759f532d00SPekka Enberg #endif /* KVM__DISK_IMAGE_H */ 76