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Revert "nfsd4: remove check_conflicting_opens warning"

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commit 4aa5e002034f0701c3335379fd6c22d7f3338cce upstream.

This reverts commit 50747dd5e4 "nfsd4: remove check_conflicting_opens
warning", as a prerequisite for reverting 94415b06eb, which has a
serious bug.

Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
J. Bruce Fields 2021-03-08 10:51:51 -05:00 committed by Greg Kroah-Hartman
parent d955f13ea2
commit 894ecf0cb5
1 changed files with 1 additions and 0 deletions
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fs/nfsd/nfs4state.c
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@ -4957,6 +4957,7 @@ static int nfsd4_check_conflicting_opens(struct nfs4_client *clp,
writes--;
if (fp->fi_fds[O_RDWR])
writes--;
WARN_ON_ONCE(writes < 0);
if (writes > 0)
return -EAGAIN;
spin_lock(&fp->fi_lock);