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ceph: don't update importing cap's mseq when handing cap export

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commit 3c1392d4c4 upstream.

Updating mseq makes client think importer mds has accepted all prior
cap messages and importer mds knows what caps client wants. Actually
some cap messages may have been dropped because of mseq mismatch.

If mseq is left untouched, importing cap's mds_wanted later will get
reset by cap import message.

Cc: stable@vger.kernel.org
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yan, Zheng 2018-11-29 11:22:50 +08:00 committed by Greg Kroah-Hartman
parent dc8408ea0b
commit 9797226bf6
1 changed files with 0 additions and 1 deletions
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fs/ceph/caps.c
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@ -3566,7 +3566,6 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
tcap->cap_id = t_cap_id;
tcap->seq = t_seq - 1;
tcap->issue_seq = t_seq - 1;
tcap->mseq = t_mseq;
tcap->issued |= issued;
tcap->implemented |= issued;
if (cap == ci->i_auth_cap)