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authorJ. Bruce Fields <bfields@redhat.com>2012-08-17 23:31:53 +0200
committerJ. Bruce Fields <bfields@redhat.com>2012-08-21 00:39:19 +0200
commitd10f27a750312ed5638c876e4bd6aa83664cccd8 (patch)
tree9d6c68a078bc5129080177829d531d2686ea4e2a /fs/locks.c
parentsvcrpc: sends on closed socket should stop immediately (diff)
downloadlinux-d10f27a750312ed5638c876e4bd6aa83664cccd8.tar.xz
linux-d10f27a750312ed5638c876e4bd6aa83664cccd8.zip
svcrpc: fix svc_xprt_enqueue/svc_recv busy-looping
The rpc server tries to ensure that there will be room to send a reply before it receives a request. It does this by tracking, in xpt_reserved, an upper bound on the total size of the replies that is has already committed to for the socket. Currently it is adding in the estimate for a new reply *before* it checks whether there is space available. If it finds that there is not space, it then subtracts the estimate back out. This may lead the subsequent svc_xprt_enqueue to decide that there is space after all. The results is a svc_recv() that will repeatedly return -EAGAIN, causing server threads to loop without doing any actual work. Cc: stable@vger.kernel.org Reported-by: Michael Tokarev <mjt@tls.msk.ru> Tested-by: Michael Tokarev <mjt@tls.msk.ru> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/locks.c')
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