int
krbd_resize(struct rbd_ctx *ctx, uint64_t size)
{
int ret;
assert(size % truncbdy == 0);
/*
* When krbd detects a size change, it calls revalidate_disk(),
* which ends up calling invalidate_bdev(), which invalidates
* clean pages and does nothing about dirty pages beyond the
* new size. The preceding cache flush makes sure those pages
* are invalidated, which is what we need on shrink:
*
* write 0..1M
* resize 0
* resize 2M
* write 1..2M
*
* results in "data data" rather than "0000 data".
*/
ret = __krbd_flush(ctx);
if (ret < 0)
return ret;
return __librbd_resize(ctx, size);
}
int
krbd_resize(struct rbd_ctx *ctx, uint64_t size)
{
int ret;
assert(size % truncbdy == 0);
/*
* This is essential: when krbd detects a size change, it calls
* revalidate_disk(), which ends up calling invalidate_bdev(),
* which invalidates only clean buffers. The cache flush makes
* it invalidate everything, which is what we need if we are
* shrinking.
*/
ret = __krbd_flush(ctx);
if (ret < 0)
return ret;
return __librbd_resize(ctx, size);
}
int
librbd_resize(struct rbd_ctx *ctx, uint64_t size)
{
return __librbd_resize(ctx, size);
}
