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| author | Trond Myklebust <trondmy@gmail.com> | 2019-04-05 08:54:37 -0700 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2019-04-08 12:43:15 -0400 |
| commit | e6abc8caa6deb14be2a206253f7e1c5e37e9515b (patch) | |
| tree | e3eea6085be977aed5822ab9ad06b13b6e697f48 /fs/nfsd/state.h | |
| parent | 3c86794ac0e6582eea7733619d58ea150198502f (diff) | |
| download | linux-e6abc8caa6deb14be2a206253f7e1c5e37e9515b.tar.bz2 | |
nfsd: Don't release the callback slot unless it was actually held
If there are multiple callbacks queued, waiting for the callback
slot when the callback gets shut down, then they all currently
end up acting as if they hold the slot, and call
nfsd4_cb_sequence_done() resulting in interesting side-effects.
In addition, the 'retry_nowait' path in nfsd4_cb_sequence_done()
causes a loop back to nfsd4_cb_prepare() without first freeing the
slot, which causes a deadlock when nfsd41_cb_get_slot() gets called
a second time.
This patch therefore adds a boolean to track whether or not the
callback did pick up the slot, so that it can do the right thing
in these 2 cases.
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/state.h')
| -rw-r--r-- | fs/nfsd/state.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h index 396c76755b03..9d6cb246c6c5 100644 --- a/fs/nfsd/state.h +++ b/fs/nfsd/state.h @@ -70,6 +70,7 @@ struct nfsd4_callback { int cb_seq_status; int cb_status; bool cb_need_restart; + bool cb_holds_slot; }; struct nfsd4_callback_ops { |