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Registered in England and Wales under Company Registration No. 3798903 Subject: [RFC PATCH 49/61] afs: Don't truncate iter during data fetch From: David Howells To: Trond Myklebust , Anna Schumaker , Steve French , Jeff Layton Cc: dhowells@redhat.com, Matthew Wilcox , Alexander Viro , linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 04 May 2020 18:14:52 +0100 Message-ID: <158861249201.340223.13035445866976590375.stgit@warthog.procyon.org.uk> In-Reply-To: <158861203563.340223.7585359869938129395.stgit@warthog.procyon.org.uk> References: <158861203563.340223.7585359869938129395.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.21 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org 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 --- fs/afs/fsclient.c | 6 ++++-- fs/afs/internal.h | 6 ++++++ fs/afs/rxrpc.c | 13 +++++++++---- fs/afs/yfsclient.c | 6 ++++-- include/net/af_rxrpc.h | 2 +- net/rxrpc/recvmsg.c | 9 +++++---- 6 files changed, 29 insertions(+), 13 deletions(-) diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c index 68fc46634346..492fbd964576 100644 --- a/fs/afs/fsclient.c +++ b/fs/afs/fsclient.c @@ -327,8 +327,9 @@ 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: @@ -365,6 +366,7 @@ 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]; diff --git a/fs/afs/internal.h b/fs/afs/internal.h index 68d3eb0dc367..521a03023112 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -115,6 +115,7 @@ struct afs_call { struct afs_vnode *lvnode; /* vnode being locked */ void *request; /* request data (first part) */ struct address_space *mapping; /* Pages being written from */ + 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 */ @@ -1131,6 +1132,7 @@ static inline void afs_set_fc_call(struct afs_call *call, struct afs_fs_cursor * 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); @@ -1138,21 +1140,25 @@ 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); } diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c index 1ecc67da6c1a..b2296feaaff3 100644 --- a/fs/afs/rxrpc.c +++ b/fs/afs/rxrpc.c @@ -364,6 +364,7 @@ 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; @@ -465,9 +466,10 @@ void afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, gfp_t gfp) 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; @@ -503,6 +505,7 @@ void afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, gfp_t gfp) 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; @@ -515,10 +518,11 @@ 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); @@ -926,10 +930,11 @@ 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; diff --git a/fs/afs/yfsclient.c b/fs/afs/yfsclient.c index 7f419f8bb943..1164f48e308d 100644 --- a/fs/afs/yfsclient.c +++ b/fs/afs/yfsclient.c @@ -442,8 +442,9 @@ 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: @@ -475,6 +476,7 @@ 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]; diff --git a/include/net/af_rxrpc.h b/include/net/af_rxrpc.h index 04e97bab6f28..0f7d13547b77 100644 --- a/include/net/af_rxrpc.h +++ b/include/net/af_rxrpc.h @@ -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 *); diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c index 8578c39ec839..802b712f3d79 100644 --- a/net/rxrpc/recvmsg.c +++ b/net/rxrpc/recvmsg.c @@ -624,6 +624,7 @@ int rxrpc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, * @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) @@ -639,7 +640,7 @@ int rxrpc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, * *_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; @@ -647,7 +648,7 @@ 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_ACCEPTING); @@ -658,8 +659,8 @@ 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;