From: Ilya Dryomov <ilya.dryomov@inktank.com>
Date: Fri, 31 Jan 2014 15:54:26 +0000 (+0200)
Subject: libceph: a per-osdc crush scratch buffer
X-Git-Tag: v3.15-rc1~61^2~78
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9d521470a40f16110bd31018034155c60c1a1275;p=pandora-kernel.git

libceph: a per-osdc crush scratch buffer

With the addition of erasure coding support in the future, scratch
variable-length array in crush_do_rule_ary() is going to grow to at
least 200 bytes on average, on top of another 128 bytes consumed by
rawosd/osd arrays in the call chain.  Replace it with a buffer inside
struct osdmap and a mutex.  This shouldn't result in any contention,
because all osd requests were already serialized by request_mutex at
that point; the only unlocked caller was ceph_ioctl_get_dataloc().

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
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