mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
has the same arguments as READ but allows the server to return an array of data and hole extents. Otherwise it's a lot of cleanup and bugfixes. -----BEGIN PGP SIGNATURE----- iQJJBAABCAAzFiEEYtFWavXG9hZotryuJ5vNeUKO4b4FAl+Q5vsVHGJmaWVsZHNA ZmllbGRzZXMub3JnAAoJECebzXlCjuG+DUAP/RlALnXbaoWi8YCcEcc9U1LoQKbD CJpDR+FqCOyGwRuzWung/5pvkOO50fGEeAroos+2rF/NgRkQq8EFr9AuBhNOYUFE IZhWEOfu/r2ukXyBmcu21HGcWLwPnyJehvjuzTQW2wOHlBi/sdoL5Ap1sVlwVLj5 EZ5kqJLD+ioG2sufW99Spi55l1Cy+3Y0IhLSWl4ZAE6s8hmFSYAJZFsOeI0Afx57 USPTDRaeqjyEULkb+f8IhD0eRApOUo4evDn9dwQx+of7HPa1CiygctTKYwA3hnlc gXp2KpVA1REaiYVgOPwYlnqBmJ2K9X0wCRzcWy2razqEcVAX/2j7QCe9M2mn4DC8 xZ2q4SxgXu9yf0qfUSVnDxWmP6ipqq7OmsG0JXTFseGKBdpjJY1qHhyqanVAGvEg I+xHnnWfGwNCftwyA3mt3RfSFPsbLlSBIMZxvN4kn8aVlqszGITOQvTdQcLYA6kT xWllBf4XKVXMqF0PzerxPDmfzBfhx6b1VPWOIVcu7VLBg3IXoEB2G5xG8MUJiSch OUTCt41LUQkerQlnzaZYqwmFdSBfXJefmcE/x/vps4VtQ/fPHX1jQyD7iTu3HfSP bRlkKHvNVeTodlBDe/HTPiTA99MShhBJyvtV5wfzIqwjc1cNreed+ePppxn8mxJi SmQ2uZk/MpUl7/V0 =rcOj -----END PGP SIGNATURE----- Merge tag 'nfsd-5.10' of git://linux-nfs.org/~bfields/linux Pull nfsd updates from Bruce Fields: "The one new feature this time, from Anna Schumaker, is READ_PLUS, which has the same arguments as READ but allows the server to return an array of data and hole extents. Otherwise it's a lot of cleanup and bugfixes" * tag 'nfsd-5.10' of git://linux-nfs.org/~bfields/linux: (43 commits) NFSv4.2: Fix NFS4ERR_STALE error when doing inter server copy SUNRPC: fix copying of multiple pages in gss_read_proxy_verf() sunrpc: raise kernel RPC channel buffer size svcrdma: fix bounce buffers for unaligned offsets and multiple pages nfsd: remove unneeded break net/sunrpc: Fix return value for sysctl sunrpc.transports NFSD: Encode a full READ_PLUS reply NFSD: Return both a hole and a data segment NFSD: Add READ_PLUS hole segment encoding NFSD: Add READ_PLUS data support NFSD: Hoist status code encoding into XDR encoder functions NFSD: Map nfserr_wrongsec outside of nfsd_dispatch NFSD: Remove the RETURN_STATUS() macro NFSD: Call NFSv2 encoders on error returns NFSD: Fix .pc_release method for NFSv2 NFSD: Remove vestigial typedefs NFSD: Refactor nfsd_dispatch() error paths NFSD: Clean up nfsd_dispatch() variables NFSD: Clean up stale comments in nfsd_dispatch() NFSD: Clean up switch statement in nfsd_dispatch() ...
376 lines
11 KiB
C
376 lines
11 KiB
C
/******************************************************************************
|
|
|
|
(c) 2007 Network Appliance, Inc. All Rights Reserved.
|
|
(c) 2009 NetApp. All Rights Reserved.
|
|
|
|
NetApp provides this source code under the GPL v2 License.
|
|
The GPL v2 license is available at
|
|
https://opensource.org/licenses/gpl-license.php.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
|
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
******************************************************************************/
|
|
|
|
#include <linux/tcp.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sunrpc/xprt.h>
|
|
#include <linux/export.h>
|
|
#include <linux/sunrpc/bc_xprt.h>
|
|
|
|
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
|
|
#define RPCDBG_FACILITY RPCDBG_TRANS
|
|
#endif
|
|
|
|
#define BC_MAX_SLOTS 64U
|
|
|
|
unsigned int xprt_bc_max_slots(struct rpc_xprt *xprt)
|
|
{
|
|
return BC_MAX_SLOTS;
|
|
}
|
|
|
|
/*
|
|
* Helper routines that track the number of preallocation elements
|
|
* on the transport.
|
|
*/
|
|
static inline int xprt_need_to_requeue(struct rpc_xprt *xprt)
|
|
{
|
|
return xprt->bc_alloc_count < xprt->bc_alloc_max;
|
|
}
|
|
|
|
/*
|
|
* Free the preallocated rpc_rqst structure and the memory
|
|
* buffers hanging off of it.
|
|
*/
|
|
static void xprt_free_allocation(struct rpc_rqst *req)
|
|
{
|
|
struct xdr_buf *xbufp;
|
|
|
|
dprintk("RPC: free allocations for req= %p\n", req);
|
|
WARN_ON_ONCE(test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state));
|
|
xbufp = &req->rq_rcv_buf;
|
|
free_page((unsigned long)xbufp->head[0].iov_base);
|
|
xbufp = &req->rq_snd_buf;
|
|
free_page((unsigned long)xbufp->head[0].iov_base);
|
|
kfree(req);
|
|
}
|
|
|
|
static int xprt_alloc_xdr_buf(struct xdr_buf *buf, gfp_t gfp_flags)
|
|
{
|
|
struct page *page;
|
|
/* Preallocate one XDR receive buffer */
|
|
page = alloc_page(gfp_flags);
|
|
if (page == NULL)
|
|
return -ENOMEM;
|
|
xdr_buf_init(buf, page_address(page), PAGE_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
static
|
|
struct rpc_rqst *xprt_alloc_bc_req(struct rpc_xprt *xprt, gfp_t gfp_flags)
|
|
{
|
|
struct rpc_rqst *req;
|
|
|
|
/* Pre-allocate one backchannel rpc_rqst */
|
|
req = kzalloc(sizeof(*req), gfp_flags);
|
|
if (req == NULL)
|
|
return NULL;
|
|
|
|
req->rq_xprt = xprt;
|
|
INIT_LIST_HEAD(&req->rq_bc_list);
|
|
|
|
/* Preallocate one XDR receive buffer */
|
|
if (xprt_alloc_xdr_buf(&req->rq_rcv_buf, gfp_flags) < 0) {
|
|
printk(KERN_ERR "Failed to create bc receive xbuf\n");
|
|
goto out_free;
|
|
}
|
|
req->rq_rcv_buf.len = PAGE_SIZE;
|
|
|
|
/* Preallocate one XDR send buffer */
|
|
if (xprt_alloc_xdr_buf(&req->rq_snd_buf, gfp_flags) < 0) {
|
|
printk(KERN_ERR "Failed to create bc snd xbuf\n");
|
|
goto out_free;
|
|
}
|
|
return req;
|
|
out_free:
|
|
xprt_free_allocation(req);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Preallocate up to min_reqs structures and related buffers for use
|
|
* by the backchannel. This function can be called multiple times
|
|
* when creating new sessions that use the same rpc_xprt. The
|
|
* preallocated buffers are added to the pool of resources used by
|
|
* the rpc_xprt. Any one of these resources may be used by an
|
|
* incoming callback request. It's up to the higher levels in the
|
|
* stack to enforce that the maximum number of session slots is not
|
|
* being exceeded.
|
|
*
|
|
* Some callback arguments can be large. For example, a pNFS server
|
|
* using multiple deviceids. The list can be unbound, but the client
|
|
* has the ability to tell the server the maximum size of the callback
|
|
* requests. Each deviceID is 16 bytes, so allocate one page
|
|
* for the arguments to have enough room to receive a number of these
|
|
* deviceIDs. The NFS client indicates to the pNFS server that its
|
|
* callback requests can be up to 4096 bytes in size.
|
|
*/
|
|
int xprt_setup_backchannel(struct rpc_xprt *xprt, unsigned int min_reqs)
|
|
{
|
|
if (!xprt->ops->bc_setup)
|
|
return 0;
|
|
return xprt->ops->bc_setup(xprt, min_reqs);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xprt_setup_backchannel);
|
|
|
|
int xprt_setup_bc(struct rpc_xprt *xprt, unsigned int min_reqs)
|
|
{
|
|
struct rpc_rqst *req;
|
|
struct list_head tmp_list;
|
|
int i;
|
|
|
|
dprintk("RPC: setup backchannel transport\n");
|
|
|
|
if (min_reqs > BC_MAX_SLOTS)
|
|
min_reqs = BC_MAX_SLOTS;
|
|
|
|
/*
|
|
* We use a temporary list to keep track of the preallocated
|
|
* buffers. Once we're done building the list we splice it
|
|
* into the backchannel preallocation list off of the rpc_xprt
|
|
* struct. This helps minimize the amount of time the list
|
|
* lock is held on the rpc_xprt struct. It also makes cleanup
|
|
* easier in case of memory allocation errors.
|
|
*/
|
|
INIT_LIST_HEAD(&tmp_list);
|
|
for (i = 0; i < min_reqs; i++) {
|
|
/* Pre-allocate one backchannel rpc_rqst */
|
|
req = xprt_alloc_bc_req(xprt, GFP_KERNEL);
|
|
if (req == NULL) {
|
|
printk(KERN_ERR "Failed to create bc rpc_rqst\n");
|
|
goto out_free;
|
|
}
|
|
|
|
/* Add the allocated buffer to the tmp list */
|
|
dprintk("RPC: adding req= %p\n", req);
|
|
list_add(&req->rq_bc_pa_list, &tmp_list);
|
|
}
|
|
|
|
/*
|
|
* Add the temporary list to the backchannel preallocation list
|
|
*/
|
|
spin_lock(&xprt->bc_pa_lock);
|
|
list_splice(&tmp_list, &xprt->bc_pa_list);
|
|
xprt->bc_alloc_count += min_reqs;
|
|
xprt->bc_alloc_max += min_reqs;
|
|
atomic_add(min_reqs, &xprt->bc_slot_count);
|
|
spin_unlock(&xprt->bc_pa_lock);
|
|
|
|
dprintk("RPC: setup backchannel transport done\n");
|
|
return 0;
|
|
|
|
out_free:
|
|
/*
|
|
* Memory allocation failed, free the temporary list
|
|
*/
|
|
while (!list_empty(&tmp_list)) {
|
|
req = list_first_entry(&tmp_list,
|
|
struct rpc_rqst,
|
|
rq_bc_pa_list);
|
|
list_del(&req->rq_bc_pa_list);
|
|
xprt_free_allocation(req);
|
|
}
|
|
|
|
dprintk("RPC: setup backchannel transport failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/**
|
|
* xprt_destroy_backchannel - Destroys the backchannel preallocated structures.
|
|
* @xprt: the transport holding the preallocated strucures
|
|
* @max_reqs: the maximum number of preallocated structures to destroy
|
|
*
|
|
* Since these structures may have been allocated by multiple calls
|
|
* to xprt_setup_backchannel, we only destroy up to the maximum number
|
|
* of reqs specified by the caller.
|
|
*/
|
|
void xprt_destroy_backchannel(struct rpc_xprt *xprt, unsigned int max_reqs)
|
|
{
|
|
if (xprt->ops->bc_destroy)
|
|
xprt->ops->bc_destroy(xprt, max_reqs);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xprt_destroy_backchannel);
|
|
|
|
void xprt_destroy_bc(struct rpc_xprt *xprt, unsigned int max_reqs)
|
|
{
|
|
struct rpc_rqst *req = NULL, *tmp = NULL;
|
|
|
|
dprintk("RPC: destroy backchannel transport\n");
|
|
|
|
if (max_reqs == 0)
|
|
goto out;
|
|
|
|
spin_lock_bh(&xprt->bc_pa_lock);
|
|
xprt->bc_alloc_max -= min(max_reqs, xprt->bc_alloc_max);
|
|
list_for_each_entry_safe(req, tmp, &xprt->bc_pa_list, rq_bc_pa_list) {
|
|
dprintk("RPC: req=%p\n", req);
|
|
list_del(&req->rq_bc_pa_list);
|
|
xprt_free_allocation(req);
|
|
xprt->bc_alloc_count--;
|
|
atomic_dec(&xprt->bc_slot_count);
|
|
if (--max_reqs == 0)
|
|
break;
|
|
}
|
|
spin_unlock_bh(&xprt->bc_pa_lock);
|
|
|
|
out:
|
|
dprintk("RPC: backchannel list empty= %s\n",
|
|
list_empty(&xprt->bc_pa_list) ? "true" : "false");
|
|
}
|
|
|
|
static struct rpc_rqst *xprt_get_bc_request(struct rpc_xprt *xprt, __be32 xid,
|
|
struct rpc_rqst *new)
|
|
{
|
|
struct rpc_rqst *req = NULL;
|
|
|
|
dprintk("RPC: allocate a backchannel request\n");
|
|
if (list_empty(&xprt->bc_pa_list)) {
|
|
if (!new)
|
|
goto not_found;
|
|
if (atomic_read(&xprt->bc_slot_count) >= BC_MAX_SLOTS)
|
|
goto not_found;
|
|
list_add_tail(&new->rq_bc_pa_list, &xprt->bc_pa_list);
|
|
xprt->bc_alloc_count++;
|
|
atomic_inc(&xprt->bc_slot_count);
|
|
}
|
|
req = list_first_entry(&xprt->bc_pa_list, struct rpc_rqst,
|
|
rq_bc_pa_list);
|
|
req->rq_reply_bytes_recvd = 0;
|
|
memcpy(&req->rq_private_buf, &req->rq_rcv_buf,
|
|
sizeof(req->rq_private_buf));
|
|
req->rq_xid = xid;
|
|
req->rq_connect_cookie = xprt->connect_cookie;
|
|
dprintk("RPC: backchannel req=%p\n", req);
|
|
not_found:
|
|
return req;
|
|
}
|
|
|
|
/*
|
|
* Return the preallocated rpc_rqst structure and XDR buffers
|
|
* associated with this rpc_task.
|
|
*/
|
|
void xprt_free_bc_request(struct rpc_rqst *req)
|
|
{
|
|
struct rpc_xprt *xprt = req->rq_xprt;
|
|
|
|
xprt->ops->bc_free_rqst(req);
|
|
}
|
|
|
|
void xprt_free_bc_rqst(struct rpc_rqst *req)
|
|
{
|
|
struct rpc_xprt *xprt = req->rq_xprt;
|
|
|
|
dprintk("RPC: free backchannel req=%p\n", req);
|
|
|
|
req->rq_connect_cookie = xprt->connect_cookie - 1;
|
|
smp_mb__before_atomic();
|
|
clear_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
|
|
smp_mb__after_atomic();
|
|
|
|
/*
|
|
* Return it to the list of preallocations so that it
|
|
* may be reused by a new callback request.
|
|
*/
|
|
spin_lock_bh(&xprt->bc_pa_lock);
|
|
if (xprt_need_to_requeue(xprt)) {
|
|
list_add_tail(&req->rq_bc_pa_list, &xprt->bc_pa_list);
|
|
xprt->bc_alloc_count++;
|
|
atomic_inc(&xprt->bc_slot_count);
|
|
req = NULL;
|
|
}
|
|
spin_unlock_bh(&xprt->bc_pa_lock);
|
|
if (req != NULL) {
|
|
/*
|
|
* The last remaining session was destroyed while this
|
|
* entry was in use. Free the entry and don't attempt
|
|
* to add back to the list because there is no need to
|
|
* have anymore preallocated entries.
|
|
*/
|
|
dprintk("RPC: Last session removed req=%p\n", req);
|
|
xprt_free_allocation(req);
|
|
}
|
|
xprt_put(xprt);
|
|
}
|
|
|
|
/*
|
|
* One or more rpc_rqst structure have been preallocated during the
|
|
* backchannel setup. Buffer space for the send and private XDR buffers
|
|
* has been preallocated as well. Use xprt_alloc_bc_request to allocate
|
|
* to this request. Use xprt_free_bc_request to return it.
|
|
*
|
|
* We know that we're called in soft interrupt context, grab the spin_lock
|
|
* since there is no need to grab the bottom half spin_lock.
|
|
*
|
|
* Return an available rpc_rqst, otherwise NULL if non are available.
|
|
*/
|
|
struct rpc_rqst *xprt_lookup_bc_request(struct rpc_xprt *xprt, __be32 xid)
|
|
{
|
|
struct rpc_rqst *req, *new = NULL;
|
|
|
|
do {
|
|
spin_lock(&xprt->bc_pa_lock);
|
|
list_for_each_entry(req, &xprt->bc_pa_list, rq_bc_pa_list) {
|
|
if (req->rq_connect_cookie != xprt->connect_cookie)
|
|
continue;
|
|
if (req->rq_xid == xid)
|
|
goto found;
|
|
}
|
|
req = xprt_get_bc_request(xprt, xid, new);
|
|
found:
|
|
spin_unlock(&xprt->bc_pa_lock);
|
|
if (new) {
|
|
if (req != new)
|
|
xprt_free_allocation(new);
|
|
break;
|
|
} else if (req)
|
|
break;
|
|
new = xprt_alloc_bc_req(xprt, GFP_KERNEL);
|
|
} while (new);
|
|
return req;
|
|
}
|
|
|
|
/*
|
|
* Add callback request to callback list. The callback
|
|
* service sleeps on the sv_cb_waitq waiting for new
|
|
* requests. Wake it up after adding enqueing the
|
|
* request.
|
|
*/
|
|
void xprt_complete_bc_request(struct rpc_rqst *req, uint32_t copied)
|
|
{
|
|
struct rpc_xprt *xprt = req->rq_xprt;
|
|
struct svc_serv *bc_serv = xprt->bc_serv;
|
|
|
|
spin_lock(&xprt->bc_pa_lock);
|
|
list_del(&req->rq_bc_pa_list);
|
|
xprt->bc_alloc_count--;
|
|
spin_unlock(&xprt->bc_pa_lock);
|
|
|
|
req->rq_private_buf.len = copied;
|
|
set_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
|
|
|
|
dprintk("RPC: add callback request to list\n");
|
|
xprt_get(xprt);
|
|
spin_lock(&bc_serv->sv_cb_lock);
|
|
list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
|
|
wake_up(&bc_serv->sv_cb_waitq);
|
|
spin_unlock(&bc_serv->sv_cb_lock);
|
|
}
|