ceph: fix snap writeback when racing with writes

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There are two problems that come up when we try to queue a capsnap while a
write is in progress:

 - The FILE_WR cap is held, but not yet dirty, so we may queue a capsnap
   with dirty == 0.  That will crash later in __ceph_flush_snaps().  Or
   on the FILE_WR cap if a write is in progress.
 - We may not have i_head_snapc set, which causes problems pretty quickly.
   Look to the snaprealm in this case.

Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>

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This commit is contained in:

Sage Weil 2011-07-26 11:26:31 -07:00

parent 9cfa1098dc

commit af0ed569d7

1 changed files with 20 additions and 3 deletions

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23

fs/ceph/snap.c

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