c2ea3d44bf
r359473 removed the page unbusy logic from sendfile_iodone() because when vm_pager_get_pages_async() would return an error after failing to start the async I/O (eg. because VOP_BMAP failed), sendfile_swapin() would also unbusy the pages, and it was wrong to unbusy twice. However this breaks the case where vm_pager_get_pages_async() succeeds in starting an async I/O and the async I/O is what fails. In this case, sendfile_iodone() must unbusy the pages, and because sendfile_iodone() doesn't know which case it is in, sendfile_iodone() must always unbusy pages and relookup pages which have been substituted with bogus_page, which in turn means that sendfile_swapin() must never do unbusy or relookup for pages which have been given to vm_pager_get_pages_async(), even if there is an error. Reviewed by: kib, markj Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D25136
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