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afs: Don't truncate iter during data fetch 

Don't truncate the iterator to correspond to the actual data size when
fetching the data from the server - rather, pass the length we want to read
to rxrpc.

This will allow the clear-after-read code in future to simply clear the
remaining iterator capacity rather than having to reinitialise the
iterator.

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-By: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
Link: https://lore.kernel.org/r/158861249201.340223.13035445866976590375.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/159465825061.1377938.14403904452300909320.stgit@warthog.procyon.org.uk/
Link: https://lore.kernel.org/r/160588531418.3465195.10712005940763063144.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/161118148567.1232039.13380313332292947956.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/161161044610.2537118.17908520793806837792.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/161340407907.1303470.6501394859511712746.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/161539551721.286939.14655713136572200716.stgit@warthog.procyon.org.uk/ # v4
Link: https://lore.kernel.org/r/161653807790.2770958.14034599989374173734.stgit@warthog.procyon.org.uk/ # v5
Link: https://lore.kernel.org/r/161789090823.6155.15673999934535049102.stgit@warthog.procyon.org.uk/ # v6
This commit is contained in:
David Howells 2020-02-06 14:22:28 +00:00
parent c69bf479ba
commit f105da1a79
6 changed files with 29 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/afs/fsclient.c
View File

@ -305,8 +305,9 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call)
unsigned int size;
int ret;
_enter("{%u,%zu/%llu}",
call->unmarshall, iov_iter_count(call->iter), req->actual_len);
_enter("{%u,%zu,%zu/%llu}",
call->unmarshall, call->iov_len, iov_iter_count(call->iter),
req->actual_len);
switch (call->unmarshall) {
case 0:
@ -343,6 +344,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call)
size = PAGE_SIZE - req->offset;
else
size = req->remain;
call->iov_len = size;
call->bvec[0].bv_len = size;
call->bvec[0].bv_offset = req->offset;
call->bvec[0].bv_page = req->pages[req->index];

6
fs/afs/internal.h
View File

@ -104,6 +104,7 @@ struct afs_call {
struct afs_server *server; /* The fileserver record if fs op (pins ref) */
struct afs_vlserver *vlserver; /* The vlserver record if vl op */
void *request; /* request data (first part) */
size_t iov_len; /* Size of *iter to be used */
struct iov_iter def_iter; /* Default buffer/data iterator */
struct iov_iter *iter; /* Iterator currently in use */
union { /* Convenience for ->def_iter */
@ -1271,6 +1272,7 @@ static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *c
static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
{
call->iov_len = size;
call->kvec[0].iov_base = buf;
call->kvec[0].iov_len = size;
iov_iter_kvec(&call->def_iter, READ, call->kvec, 1, size);
@ -1278,21 +1280,25 @@ static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t si
static inline void afs_extract_to_tmp(struct afs_call *call)
{
call->iov_len = sizeof(call->tmp);
afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
}
static inline void afs_extract_to_tmp64(struct afs_call *call)
{
call->iov_len = sizeof(call->tmp64);
afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
}
static inline void afs_extract_discard(struct afs_call *call, size_t size)
{
call->iov_len = size;
iov_iter_discard(&call->def_iter, READ, size);
}
static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
{
call->iov_len = size;
afs_extract_begin(call, call->buffer, size);
}

13
fs/afs/rxrpc.c
View File

@ -363,6 +363,7 @@ void afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, gfp_t gfp)
struct rxrpc_call *rxcall;
struct msghdr msg;
struct kvec iov[1];
size_t len;
s64 tx_total_len;
int ret;
@ -466,9 +467,10 @@ error_do_abort:
rxrpc_kernel_abort_call(call->net->socket, rxcall,
RX_USER_ABORT, ret, "KSD");
} else {
len = 0;
iov_iter_kvec(&msg.msg_iter, READ, NULL, 0, 0);
rxrpc_kernel_recv_data(call->net->socket, rxcall,
&msg.msg_iter, false,
&msg.msg_iter, &len, false,
&call->abort_code, &call->service_id);
ac->abort_code = call->abort_code;
ac->responded = true;
@ -504,6 +506,7 @@ error_kill_call:
static void afs_deliver_to_call(struct afs_call *call)
{
enum afs_call_state state;
size_t len;
u32 abort_code, remote_abort = 0;
int ret;
@ -516,10 +519,11 @@ static void afs_deliver_to_call(struct afs_call *call)
state == AFS_CALL_SV_AWAIT_ACK
) {
if (state == AFS_CALL_SV_AWAIT_ACK) {
len = 0;
iov_iter_kvec(&call->def_iter, READ, NULL, 0, 0);
ret = rxrpc_kernel_recv_data(call->net->socket,
call->rxcall, &call->def_iter,
false, &remote_abort,
&len, false, &remote_abort,
&call->service_id);
trace_afs_receive_data(call, &call->def_iter, false, ret);
@ -929,10 +933,11 @@ int afs_extract_data(struct afs_call *call, bool want_more)
u32 remote_abort = 0;
int ret;
_enter("{%s,%zu},%d", call->type->name, iov_iter_count(iter), want_more);
_enter("{%s,%zu,%zu},%d",
call->type->name, call->iov_len, iov_iter_count(iter), want_more);
ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, iter,
want_more, &remote_abort,
&call->iov_len, want_more, &remote_abort,
&call->service_id);
if (ret == 0 || ret == -EAGAIN)
return ret;

6
fs/afs/yfsclient.c
View File

@ -363,8 +363,9 @@ static int yfs_deliver_fs_fetch_data64(struct afs_call *call)
unsigned int size;
int ret;
_enter("{%u,%zu/%llu}",
call->unmarshall, iov_iter_count(call->iter), req->actual_len);
_enter("{%u,%zu, %zu/%llu}",
call->unmarshall, call->iov_len, iov_iter_count(call->iter),
req->actual_len);
switch (call->unmarshall) {
case 0:
@ -396,6 +397,7 @@ static int yfs_deliver_fs_fetch_data64(struct afs_call *call)
size = PAGE_SIZE - req->offset;
else
size = req->remain;
call->iov_len = size;
call->bvec[0].bv_len = size;
call->bvec[0].bv_offset = req->offset;
call->bvec[0].bv_page = req->pages[req->index];

2
include/net/af_rxrpc.h
View File

@ -53,7 +53,7 @@ int rxrpc_kernel_send_data(struct socket *, struct rxrpc_call *,
struct msghdr *, size_t,
rxrpc_notify_end_tx_t);
int rxrpc_kernel_recv_data(struct socket *, struct rxrpc_call *,
struct iov_iter *, bool, u32 *, u16 *);
struct iov_iter *, size_t *, bool, u32 *, u16 *);
bool rxrpc_kernel_abort_call(struct socket *, struct rxrpc_call *,
u32, int, const char *);
void rxrpc_kernel_end_call(struct socket *, struct rxrpc_call *);

9
net/rxrpc/recvmsg.c
View File

@ -669,6 +669,7 @@ wait_error:
* @sock: The socket that the call exists on
* @call: The call to send data through
* @iter: The buffer to receive into
* @_len: The amount of data we want to receive (decreased on return)
* @want_more: True if more data is expected to be read
* @_abort: Where the abort code is stored if -ECONNABORTED is returned
* @_service: Where to store the actual service ID (may be upgraded)
@ -684,7 +685,7 @@ wait_error:
* *_abort should also be initialised to 0.
*/
int rxrpc_kernel_recv_data(struct socket *sock, struct rxrpc_call *call,
struct iov_iter *iter,
struct iov_iter *iter, size_t *_len,
bool want_more, u32 *_abort, u16 *_service)
{
size_t offset = 0;
@ -692,7 +693,7 @@ int rxrpc_kernel_recv_data(struct socket *sock, struct rxrpc_call *call,
_enter("{%d,%s},%zu,%d",
call->debug_id, rxrpc_call_states[call->state],
iov_iter_count(iter), want_more);
*_len, want_more);
ASSERTCMP(call->state, !=, RXRPC_CALL_SERVER_SECURING);
@ -703,8 +704,8 @@ int rxrpc_kernel_recv_data(struct socket *sock, struct rxrpc_call *call,
case RXRPC_CALL_SERVER_RECV_REQUEST:
case RXRPC_CALL_SERVER_ACK_REQUEST:
ret = rxrpc_recvmsg_data(sock, call, NULL, iter,
iov_iter_count(iter), 0,
&offset);
*_len, 0, &offset);
*_len -= offset;
if (ret < 0)
goto out;