diff options
Diffstat (limited to 'block.c')
-rw-r--r-- | block.c | 39 |
1 files changed, 39 insertions, 0 deletions
@@ -452,6 +452,8 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, (flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO)); else open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); + + bs->open_flags = open_flags; if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) ret = -ENOTSUP; else @@ -779,6 +781,43 @@ int bdrv_pwrite(BlockDriverState *bs, int64_t offset, return count1; } +/* + * Writes to the file and ensures that no writes are reordered across this + * request (acts as a barrier) + * + * Returns 0 on success, -errno in error cases. + */ +int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, + const void *buf, int count) +{ + int ret; + + ret = bdrv_pwrite(bs, offset, buf, count); + if (ret < 0) { + return ret; + } + + /* No flush needed for cache=writethrough, it uses O_DSYNC */ + if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) { + bdrv_flush(bs); + } + + return 0; +} + +/* + * Writes to the file and ensures that no writes are reordered across this + * request (acts as a barrier) + * + * Returns 0 on success, -errno in error cases. + */ +int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num, + const uint8_t *buf, int nb_sectors) +{ + return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num, + buf, BDRV_SECTOR_SIZE * nb_sectors); +} + /** * Truncate file to 'offset' bytes (needed only for file protocols) */ |