diff options
Diffstat (limited to 'src/server/image.h')
-rw-r--r-- | src/server/image.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/src/server/image.h b/src/server/image.h new file mode 100644 index 0000000..4668eff --- /dev/null +++ b/src/server/image.h @@ -0,0 +1,63 @@ +#ifndef _IMAGE_H_ +#define _IMAGE_H_ + +#include "globals.h" + +struct json_t; + +void image_serverStartup(); + +bool image_isComplete(dnbd3_image_t *image); + +bool image_isHashBlockComplete(const uint8_t * const cacheMap, const uint64_t block, const uint64_t fileSize); + +void image_updateCachemap(dnbd3_image_t *image, uint64_t start, uint64_t end, const bool set); + +void image_markComplete(dnbd3_image_t *image); + +bool image_ensureOpen(dnbd3_image_t *image); + +dnbd3_image_t* image_get(char *name, uint16_t revision, bool checkIfWorking); + +bool image_reopenCacheFd(dnbd3_image_t *image, const bool force); + +dnbd3_image_t* image_getOrLoad(char *name, uint16_t revision); + +dnbd3_image_t* image_lock(dnbd3_image_t *image); + +dnbd3_image_t* image_release(dnbd3_image_t *image); + +bool image_checkBlocksCrc32(int fd, uint32_t *crc32list, const int *blocks, const uint64_t fileSize); + +void image_killUplinks(); + +bool image_loadAll(char *path); + +bool image_tryFreeAll(); + +bool image_create(char *image, int revision, uint64_t size); + +bool image_generateCrcFile(char *image); + +struct json_t* image_getListAsJson(); + +int image_getCompletenessEstimate(dnbd3_image_t * const image); + +void image_closeUnusedFd(); + +bool image_ensureDiskSpaceLocked(uint64_t size, bool force); + +// one byte in the map covers 8 4kib blocks, so 32kib per byte +// "+ (1 << 15) - 1" is required to account for the last bit of +// the image that is smaller than 32kib +// this would be the case whenever the image file size is not a +// multiple of 32kib (= the number of blocks is not divisible by 8) +// ie: if the image is 49152 bytes and you do 49152 >> 15 you get 1, +// but you actually need 2 bytes to have a complete cache map +#define IMGSIZE_TO_MAPBYTES(bytes) ((int)(((bytes) + (1 << 15) - 1) >> 15)) + +// calculate number of hash blocks in file. One hash block is 16MiB +#define HASH_BLOCK_SIZE ((int64_t)(1 << 24)) +#define IMGSIZE_TO_HASHBLOCKS(bytes) ((int)(((bytes) + HASH_BLOCK_SIZE - 1) / HASH_BLOCK_SIZE)) + +#endif |