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Wed, 28 Aug 2024 21:03:01 +0000 (UTC) From: David Howells To: Christian Brauner , Steve French Cc: David Howells , Paulo Alcantara , Tom Talpey , Dominique Martinet , Jeff Layton , Matthew Wilcox , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/6] cifs: Fix lack of credit renegotiation on read retry Date: Wed, 28 Aug 2024 22:02:42 +0100 Message-ID: <20240828210249.1078637-2-dhowells@redhat.com> In-Reply-To: <20240828210249.1078637-1-dhowells@redhat.com> References: <20240828210249.1078637-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 34BFD40025 X-Stat-Signature: fwtk4m31nykeq9aq8gpukc9kb8dcz3ne X-Rspam-User: X-HE-Tag: 1724878993-102146 X-HE-Meta: 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 bTVSvJfx CSXkwRj1UxizvArH7wEbempXkP43AdbcknOdjEltT+5lxcykVGlEvK0OeOdBcoiWrIkQDRdbu6MGd61sRXe8Kxg8Ks6WilkfSo2815ql4VMm0KpwJSQEi3nhGZJp0h/yh2SyRHLdHr6AB9GUCEY3S1ujG+yZPrW+x9RzW5/3q89NMVmJ29cW5qqpoEAxSKMiCi/diWX18knBBWQm7hM74W7zcFhBKu2EUEAaPpBQ4cdQMBQcOHpTw7tBxYN6omNn7L4f0UvOnhYuri29HSPv1CdzudUHq776S2x1MasvxWtIGGBz36IFKc22YcDGELUkySQyugf3QewGKfG3dfrXBGqcZUBmsXh+06xjLWwcqAQI2gm6prk4/e5zNwu3MtcIrxXEXVxH7jzbj4xdEGC22nq4zw1BTPXeq87ax8ciOgfRglMhZL1tLqRfZaMiCHlVfAbm3VNfRIln0JwmKN9SCYgrYPML4Q+x+rZTg7YHH+fkzfaFzhdKsc7bvcA+I/Yh/HyH+ X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: When netfslib asks cifs to issue a read operation, it prefaces this with a call to ->clamp_length() which cifs uses to negotiate credits, providing receive capacity on the server; however, in the event that a read op needs reissuing, netfslib doesn't call ->clamp_length() again as that could shorten the subrequest, leaving a gap. This causes the retried read to be done with zero credits which causes the server to reject it with STATUS_INVALID_PARAMETER. This is a problem for a DIO read that is requested that would go over the EOF. The short read will be retried, causing EINVAL to be returned to the user when it fails. Fix this by making cifs_req_issue_read() negotiate new credits if retrying (NETFS_SREQ_RETRYING now gets set in the read side as well as the write side in this instance). This isn't sufficient, however: the new credits might not be sufficient to complete the remainder of the read, so also add an additional field, rreq->actual_len, that holds the actual size of the op we want to perform without having to alter subreq->len. We then rely on repeated short reads being retried until we finish the read or reach the end of file and make a zero-length read. Also fix a couple of places where the subrequest start and length need to be altered by the amount so far transferred when being used. Fixes: 69c3c023af25 ("cifs: Implement netfslib hooks") Signed-off-by: David Howells cc: Steve French cc: Paulo Alcantara cc: Jeff Layton cc: linux-cifs@vger.kernel.org cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org --- fs/netfs/io.c | 2 ++ fs/smb/client/cifsglob.h | 1 + fs/smb/client/file.c | 37 +++++++++++++++++++++++++++++++++---- fs/smb/client/smb2ops.c | 2 +- fs/smb/client/smb2pdu.c | 28 +++++++++++++++++----------- fs/smb/client/trace.h | 1 + 6 files changed, 55 insertions(+), 16 deletions(-) diff --git a/fs/netfs/io.c b/fs/netfs/io.c index 4da0a494e860..3303b515b536 100644 --- a/fs/netfs/io.c +++ b/fs/netfs/io.c @@ -306,6 +306,7 @@ static bool netfs_rreq_perform_resubmissions(struct netfs_io_request *rreq) break; subreq->source = NETFS_DOWNLOAD_FROM_SERVER; subreq->error = 0; + __set_bit(NETFS_SREQ_RETRYING, &subreq->flags); netfs_stat(&netfs_n_rh_download_instead); trace_netfs_sreq(subreq, netfs_sreq_trace_download_instead); netfs_get_subrequest(subreq, netfs_sreq_trace_get_resubmit); @@ -313,6 +314,7 @@ static bool netfs_rreq_perform_resubmissions(struct netfs_io_request *rreq) netfs_reset_subreq_iter(rreq, subreq); netfs_read_from_server(rreq, subreq); } else if (test_bit(NETFS_SREQ_SHORT_IO, &subreq->flags)) { + __set_bit(NETFS_SREQ_RETRYING, &subreq->flags); netfs_reset_subreq_iter(rreq, subreq); netfs_rreq_short_read(rreq, subreq); } diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h index f379b9dc93ba..9eae8649f90c 100644 --- a/fs/smb/client/cifsglob.h +++ b/fs/smb/client/cifsglob.h @@ -1485,6 +1485,7 @@ struct cifs_io_subrequest { struct cifs_io_request *req; }; ssize_t got_bytes; + size_t actual_len; unsigned int xid; int result; bool have_xid; diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c index f9b302cb8233..2d387485f05b 100644 --- a/fs/smb/client/file.c +++ b/fs/smb/client/file.c @@ -111,6 +111,7 @@ static void cifs_issue_write(struct netfs_io_subrequest *subreq) goto fail; } + wdata->actual_len = wdata->subreq.len; rc = adjust_credits(wdata->server, wdata, cifs_trace_rw_credits_issue_write_adjust); if (rc) goto fail; @@ -153,7 +154,7 @@ static bool cifs_clamp_length(struct netfs_io_subrequest *subreq) struct cifs_io_request *req = container_of(subreq->rreq, struct cifs_io_request, rreq); struct TCP_Server_Info *server = req->server; struct cifs_sb_info *cifs_sb = CIFS_SB(rreq->inode->i_sb); - size_t rsize = 0; + size_t rsize; int rc; rdata->xid = get_xid(); @@ -166,8 +167,8 @@ static bool cifs_clamp_length(struct netfs_io_subrequest *subreq) cifs_sb->ctx); - rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize, &rsize, - &rdata->credits); + rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize, + &rsize, &rdata->credits); if (rc) { subreq->error = rc; return false; @@ -183,7 +184,8 @@ static bool cifs_clamp_length(struct netfs_io_subrequest *subreq) server->credits, server->in_flight, 0, cifs_trace_rw_credits_read_submit); - subreq->len = min_t(size_t, subreq->len, rsize); + subreq->len = umin(subreq->len, rsize); + rdata->actual_len = subreq->len; #ifdef CONFIG_CIFS_SMB_DIRECT if (server->smbd_conn) @@ -203,12 +205,39 @@ static void cifs_req_issue_read(struct netfs_io_subrequest *subreq) struct netfs_io_request *rreq = subreq->rreq; struct cifs_io_subrequest *rdata = container_of(subreq, struct cifs_io_subrequest, subreq); struct cifs_io_request *req = container_of(subreq->rreq, struct cifs_io_request, rreq); + struct TCP_Server_Info *server = req->server; + struct cifs_sb_info *cifs_sb = CIFS_SB(rreq->inode->i_sb); int rc = 0; cifs_dbg(FYI, "%s: op=%08x[%x] mapping=%p len=%zu/%zu\n", __func__, rreq->debug_id, subreq->debug_index, rreq->mapping, subreq->transferred, subreq->len); + if (test_bit(NETFS_SREQ_RETRYING, &subreq->flags)) { + /* + * As we're issuing a retry, we need to negotiate some new + * credits otherwise the server may reject the op with + * INVALID_PARAMETER. Note, however, we may get back less + * credit than we need to complete the op, in which case, we + * shorten the op and rely on additional rounds of retry. + */ + size_t rsize = umin(subreq->len - subreq->transferred, + cifs_sb->ctx->rsize); + + rc = server->ops->wait_mtu_credits(server, rsize, &rdata->actual_len, + &rdata->credits); + if (rc) + goto out; + + rdata->credits.in_flight_check = 1; + + trace_smb3_rw_credits(rdata->rreq->debug_id, + rdata->subreq.debug_index, + rdata->credits.value, + server->credits, server->in_flight, 0, + cifs_trace_rw_credits_read_resubmit); + } + if (req->cfile->invalidHandle) { do { rc = cifs_reopen_file(req->cfile, true); diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index 0b9cb1a60d4a..a6f00b157275 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -301,7 +301,7 @@ smb2_adjust_credits(struct TCP_Server_Info *server, unsigned int /*enum smb3_rw_credits_trace*/ trace) { struct cifs_credits *credits = &subreq->credits; - int new_val = DIV_ROUND_UP(subreq->subreq.len, SMB2_MAX_BUFFER_SIZE); + int new_val = DIV_ROUND_UP(subreq->actual_len, SMB2_MAX_BUFFER_SIZE); int scredits, in_flight; if (!credits->value || credits->value == new_val) diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c index 2d7e6c42cf18..be7a1a9c691d 100644 --- a/fs/smb/client/smb2pdu.c +++ b/fs/smb/client/smb2pdu.c @@ -4529,9 +4529,9 @@ smb2_readv_callback(struct mid_q_entry *mid) "rdata server %p != mid server %p", rdata->server, mid->server); - cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu\n", + cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu/%zu\n", __func__, mid->mid, mid->mid_state, rdata->result, - rdata->subreq.len); + rdata->actual_len, rdata->subreq.len - rdata->subreq.transferred); switch (mid->mid_state) { case MID_RESPONSE_RECEIVED: @@ -4585,15 +4585,18 @@ smb2_readv_callback(struct mid_q_entry *mid) rdata->subreq.debug_index, rdata->xid, rdata->req->cfile->fid.persistent_fid, - tcon->tid, tcon->ses->Suid, rdata->subreq.start, - rdata->subreq.len, rdata->result); + tcon->tid, tcon->ses->Suid, + rdata->subreq.start + rdata->subreq.transferred, + rdata->actual_len, + rdata->result); } else trace_smb3_read_done(rdata->rreq->debug_id, rdata->subreq.debug_index, rdata->xid, rdata->req->cfile->fid.persistent_fid, tcon->tid, tcon->ses->Suid, - rdata->subreq.start, rdata->got_bytes); + rdata->subreq.start + rdata->subreq.transferred, + rdata->got_bytes); if (rdata->result == -ENODATA) { /* We may have got an EOF error because fallocate @@ -4621,6 +4624,7 @@ smb2_async_readv(struct cifs_io_subrequest *rdata) { int rc, flags = 0; char *buf; + struct netfs_io_subrequest *subreq = &rdata->subreq; struct smb2_hdr *shdr; struct cifs_io_parms io_parms; struct smb_rqst rqst = { .rq_iov = rdata->iov, @@ -4631,15 +4635,15 @@ smb2_async_readv(struct cifs_io_subrequest *rdata) int credit_request; cifs_dbg(FYI, "%s: offset=%llu bytes=%zu\n", - __func__, rdata->subreq.start, rdata->subreq.len); + __func__, subreq->start, subreq->len); if (!rdata->server) rdata->server = cifs_pick_channel(tcon->ses); io_parms.tcon = tlink_tcon(rdata->req->cfile->tlink); io_parms.server = server = rdata->server; - io_parms.offset = rdata->subreq.start; - io_parms.length = rdata->subreq.len; + io_parms.offset = subreq->start + subreq->transferred; + io_parms.length = rdata->actual_len; io_parms.persistent_fid = rdata->req->cfile->fid.persistent_fid; io_parms.volatile_fid = rdata->req->cfile->fid.volatile_fid; io_parms.pid = rdata->req->pid; @@ -4654,11 +4658,13 @@ smb2_async_readv(struct cifs_io_subrequest *rdata) rdata->iov[0].iov_base = buf; rdata->iov[0].iov_len = total_len; + rdata->got_bytes = 0; + rdata->result = 0; shdr = (struct smb2_hdr *)buf; if (rdata->credits.value > 0) { - shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->subreq.len, + shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->actual_len, SMB2_MAX_BUFFER_SIZE)); credit_request = le16_to_cpu(shdr->CreditCharge) + 8; if (server->credits >= server->max_credits) @@ -4682,11 +4688,11 @@ smb2_async_readv(struct cifs_io_subrequest *rdata) if (rc) { cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE); trace_smb3_read_err(rdata->rreq->debug_id, - rdata->subreq.debug_index, + subreq->debug_index, rdata->xid, io_parms.persistent_fid, io_parms.tcon->tid, io_parms.tcon->ses->Suid, - io_parms.offset, io_parms.length, rc); + io_parms.offset, rdata->actual_len, rc); } async_readv_out: diff --git a/fs/smb/client/trace.h b/fs/smb/client/trace.h index 0f0c10c7ada7..8e9964001e2a 100644 --- a/fs/smb/client/trace.h +++ b/fs/smb/client/trace.h @@ -30,6 +30,7 @@ EM(cifs_trace_rw_credits_old_session, "old-session") \ EM(cifs_trace_rw_credits_read_response_add, "rd-resp-add") \ EM(cifs_trace_rw_credits_read_response_clear, "rd-resp-clr") \ + EM(cifs_trace_rw_credits_read_resubmit, "rd-resubmit") \ EM(cifs_trace_rw_credits_read_submit, "rd-submit ") \ EM(cifs_trace_rw_credits_write_prepare, "wr-prepare ") \ EM(cifs_trace_rw_credits_write_response_add, "wr-resp-add") \