c9acb42ef1
The ->release_request() callback was designed to allow the transport layer to do housekeeping after the RPC call is done. It cannot be used to free the request itself, and doing so leads to a use-after-free bug in xprt_release(). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/******************************************************************************
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(c) 2008 NetApp. All Rights Reserved.
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NetApp provides this source code under the GPL v2 License.
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The GPL v2 license is available at
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http://opensource.org/licenses/gpl-license.php.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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******************************************************************************/
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/*
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* Functions to create and manage the backchannel
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*/
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#ifndef _LINUX_SUNRPC_BC_XPRT_H
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#define _LINUX_SUNRPC_BC_XPRT_H
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#include <linux/sunrpc/svcsock.h>
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#include <linux/sunrpc/xprt.h>
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#include <linux/sunrpc/sched.h>
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#ifdef CONFIG_NFS_V4_1
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struct rpc_rqst *xprt_alloc_bc_request(struct rpc_xprt *xprt);
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void xprt_free_bc_request(struct rpc_rqst *req);
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int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
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void xprt_destroy_backchannel(struct rpc_xprt *, int max_reqs);
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int bc_send(struct rpc_rqst *req);
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/*
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* Determine if a shared backchannel is in use
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*/
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static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
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{
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if (rqstp->rq_server->bc_xprt)
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return 1;
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return 0;
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}
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#else /* CONFIG_NFS_V4_1 */
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static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,
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unsigned int min_reqs)
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{
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return 0;
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}
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static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
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{
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return 0;
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}
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static inline void xprt_free_bc_request(struct rpc_rqst *req)
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{
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}
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#endif /* CONFIG_NFS_V4_1 */
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#endif /* _LINUX_SUNRPC_BC_XPRT_H */
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