From: Josh Durgin <josh.durgin@inktank.com>
Date: Tue, 22 Nov 2011 02:14:25 +0000 (-0800)
Subject: rbd: return errors for mapped but deleted snapshot
X-Git-Tag: v3.6-rc1~36^2~46
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e88a36ec961b8c1899c59c5e4ae35a318c0209d3;p=pandora-kernel.git

rbd: return errors for mapped but deleted snapshot

When a snapshot is deleted, the OSD will return ENOENT when reading
from it. This is normally interpreted as a hole by rbd, which will
return zeroes. To minimize the time in which this can happen, stop
requests early when we are notified that our snapshot no longer
exists.

[elder@inktank.com: updated __rbd_init_snaps_header() logic]

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
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