4775b07ebd
Implement ffs_getpages_async(), which when possible calls the asynchronous flavor of the generic pager's getpages function. When the underlying block size is larger than the system page size, however, it will invoke the (synchronous) buffer cache pager, followed by a call to the client completion routine. This retains true asynchronous completion in the most common (block size <= page size) case, which is important for the performance of the new sendfile(2). The behavior in the larger block size case mirrors the default implementation of VOP_GETPAGES_ASYNC, which most other filesystems use anyway as they do not override the getpages_async method. PR: 235708 Reported by: pho Reviewed by: kib, glebius MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D19340
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