K 10
svn:author
V 3
chs
K 8
svn:date
V 27
2020-06-06T00:02:50.077012Z
K 7
svn:log
V 974
Fix hang due to missing unbusy in sendfile when an async data I/O fails.

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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