From: Hristo Venev <hristo@venev.name>
Date: Sat, 7 May 2022 17:07:00 +0000 (+0300)
Subject: cache: tolerate short writes in print_slot
X-Git-Url: https://gitweb.ps.run/ps-cgit/commitdiff_plain/852cb3b0e267dd2ddfd2eeef6275435098c606e7?ds=sidebyside;hp=852cb3b0e267dd2ddfd2eeef6275435098c606e7

cache: tolerate short writes in print_slot

sendfile() can return after a short read/write, so we may need to call
it more than once. As suggested in the manual page, we fall back to
read/write if sendfile fails with EINVAL or ENOSYS.

On the read/write path, use write_in_full which deals with short writes.

Signed-off-by: Hristo Venev <hristo@venev.name>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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