From patchwork Mon Sep 11 12:49:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 13379273 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E170E111BE for ; Mon, 11 Sep 2023 12:50:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5F993C433C7; Mon, 11 Sep 2023 12:50:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1694436621; bh=funz6Wq9f0LidCNXKO99Xw5AdCgtADdnX9Xc5HOKx18=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hoNmr29XUx+h7HDkzOAxgShar8Y7HGEVVfw6PwxY5uNkXEWzAIc7e3oBxLNU6/F5U TJh+yI5/Zn7R9q4jKxN9o/GUPSNs9v871oopduLU0R59KrQq9SRAYyqzEt3PRsyAZj YmziDvvR66NLnpfZXf8hpEJNjjvy4nCvVVcUtfY2ZDErNq3w+P9j/ClctoCi5cGFj/ fNN7oIWJJsw3Ly0xeg2/hzuKfmfzJs1NKnx504zcNBrbr6dA9nfStqM2XnYKw5chwp cG4TA8P08mP5Gyt/2MBfMKrVvDeQRMbUQpgdyiTWwC7ZvMbkr6DeDF7545VPQNeVZX boHze9nfKIRng== From: Lorenzo Bianconi To: linux-nfs@vger.kernel.org Cc: lorenzo.bianconi@redhat.com, chuck.lever@oracle.com, jlayton@kernel.org, neilb@suse.de, netdev@vger.kernel.org Subject: [PATCH v8 3/3] NFSD: add rpc_status netlink support Date: Mon, 11 Sep 2023 14:49:46 +0200 Message-ID: X-Mailer: git-send-email 2.41.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Introduce rpc_status netlink support for NFSD in order to dump pending RPC requests debugging information from userspace. Tested-by: Jeff Layton Signed-off-by: Lorenzo Bianconi --- fs/nfsd/nfsctl.c | 192 ++++++++++++++++++++++++++++++++++++- fs/nfsd/nfsd.h | 16 ++++ fs/nfsd/nfssvc.c | 15 +++ fs/nfsd/state.h | 2 - include/linux/sunrpc/svc.h | 1 + 5 files changed, 222 insertions(+), 4 deletions(-) diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index 1be66088849c..b862a759ea15 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -26,6 +26,7 @@ #include "pnfs.h" #include "filecache.h" #include "trace.h" +#include "nfs_netlink_gen.h" /* * We have a single directory with several nodes in it. @@ -1497,17 +1498,199 @@ unsigned int nfsd_net_id; int nfsd_server_nl_rpc_status_get_start(struct netlink_callback *cb) { - return 0; + struct nfsd_net *nn = net_generic(sock_net(cb->skb->sk), nfsd_net_id); + int ret = -ENODEV; + + mutex_lock(&nfsd_mutex); + if (nn->nfsd_serv) { + svc_get(nn->nfsd_serv); + ret = 0; + } + mutex_unlock(&nfsd_mutex); + + return ret; } -int nfsd_server_nl_rpc_status_get_done(struct netlink_callback *cb) +static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb, + struct netlink_callback *cb, + struct nfsd_genl_rqstp *rqstp) { + void *hdr; + int i; + + hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, + &nfsd_server_nl_family, NLM_F_MULTI, + NFSD_CMD_RPC_STATUS_GET); + if (!hdr) + return -ENOBUFS; + + if (nla_put_be32(skb, NFSD_ATTR_RPC_STATUS_XID, rqstp->rq_xid) || + nla_put_u32(skb, NFSD_ATTR_RPC_STATUS_FLAGS, rqstp->rq_flags) || + nla_put_u32(skb, NFSD_ATTR_RPC_STATUS_PROG, rqstp->rq_prog) || + nla_put_u32(skb, NFSD_ATTR_RPC_STATUS_PROC, rqstp->rq_proc) || + nla_put_u8(skb, NFSD_ATTR_RPC_STATUS_VERSION, rqstp->rq_vers) || + nla_put_s64(skb, NFSD_ATTR_RPC_STATUS_SERVICE_TIME, + ktime_to_us(rqstp->rq_stime), + NFSD_ATTR_RPC_STATUS_PAD)) + return -ENOBUFS; + + switch (rqstp->saddr.sa_family) { + case AF_INET: { + const struct sockaddr_in *s_in, *d_in; + + s_in = (const struct sockaddr_in *)&rqstp->saddr; + d_in = (const struct sockaddr_in *)&rqstp->daddr; + if (nla_put_in_addr(skb, NFSD_ATTR_RPC_STATUS_SADDR4, + s_in->sin_addr.s_addr) || + nla_put_in_addr(skb, NFSD_ATTR_RPC_STATUS_DADDR4, + d_in->sin_addr.s_addr) || + nla_put_be16(skb, NFSD_ATTR_RPC_STATUS_SPORT, + s_in->sin_port) || + nla_put_be16(skb, NFSD_ATTR_RPC_STATUS_DPORT, + d_in->sin_port)) + return -ENOBUFS; + break; + } + case AF_INET6: { + const struct sockaddr_in6 *s_in, *d_in; + + s_in = (const struct sockaddr_in6 *)&rqstp->saddr; + d_in = (const struct sockaddr_in6 *)&rqstp->daddr; + if (nla_put_in6_addr(skb, NFSD_ATTR_RPC_STATUS_SADDR6, + &s_in->sin6_addr) || + nla_put_in6_addr(skb, NFSD_ATTR_RPC_STATUS_DADDR6, + &d_in->sin6_addr) || + nla_put_be16(skb, NFSD_ATTR_RPC_STATUS_SPORT, + s_in->sin6_port) || + nla_put_be16(skb, NFSD_ATTR_RPC_STATUS_DPORT, + d_in->sin6_port)) + return -ENOBUFS; + break; + } + default: + break; + } + + if (rqstp->opcnt) { + struct nlattr *attr; + + attr = nla_nest_start(skb, NFSD_ATTR_RPC_STATUS_COMPOND_OP); + if (!attr) + return -ENOBUFS; + + for (i = 0; i < rqstp->opcnt; i++) { + struct nlattr *op_attr; + + op_attr = nla_nest_start(skb, i); + if (!op_attr) + return -ENOBUFS; + + if (nla_put_u32(skb, NFSD_ATTR_RPC_STATUS_COMP_OP, + rqstp->opnum[i])) + return -ENOBUFS; + + nla_nest_end(skb, op_attr); + } + + nla_nest_end(skb, attr); + } + + genlmsg_end(skb, hdr); + return 0; } int nfsd_server_nl_rpc_status_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb) { + struct nfsd_net *nn = net_generic(sock_net(skb->sk), nfsd_net_id); + int i, ret, rqstp_index; + + rcu_read_lock(); + + for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) { + struct svc_rqst *rqstp; + + if (i < cb->args[0]) /* already consumed */ + continue; + + rqstp_index = 0; + list_for_each_entry_rcu(rqstp, + &nn->nfsd_serv->sv_pools[i].sp_all_threads, + rq_all) { + struct nfsd_genl_rqstp genl_rqstp; + unsigned int status_counter; + + if (rqstp_index++ < cb->args[1]) /* already consumed */ + continue; + /* + * Acquire rq_status_counter before parsing the rqst + * fields. rq_status_counter is set to an odd value in + * order to notify the consumers the rqstp fields are + * meaningful. + */ + status_counter = + smp_load_acquire(&rqstp->rq_status_counter); + if (!(status_counter & 1)) + continue; + + genl_rqstp.rq_xid = rqstp->rq_xid; + genl_rqstp.rq_flags = rqstp->rq_flags; + genl_rqstp.rq_vers = rqstp->rq_vers; + genl_rqstp.rq_prog = rqstp->rq_prog; + genl_rqstp.rq_proc = rqstp->rq_proc; + genl_rqstp.rq_stime = rqstp->rq_stime; + genl_rqstp.opcnt = 0; + memcpy(&genl_rqstp.daddr, svc_daddr(rqstp), + sizeof(struct sockaddr)); + memcpy(&genl_rqstp.saddr, svc_addr(rqstp), + sizeof(struct sockaddr)); + +#ifdef CONFIG_NFSD_V4 + if (rqstp->rq_vers == NFS4_VERSION && + rqstp->rq_proc == NFSPROC4_COMPOUND) { + /* NFSv4 compund */ + struct nfsd4_compoundargs *args; + int j; + + args = rqstp->rq_argp; + genl_rqstp.opcnt = args->opcnt; + for (j = 0; j < genl_rqstp.opcnt; j++) + genl_rqstp.opnum[j] = + args->ops[j].opnum; + } +#endif /* CONFIG_NFSD_V4 */ + + /* + * Acquire rq_status_counter before reporting the rqst + * fields to the user. + */ + if (smp_load_acquire(&rqstp->rq_status_counter) != + status_counter) + continue; + + ret = nfsd_genl_rpc_status_compose_msg(skb, cb, + &genl_rqstp); + if (ret) + goto out; + } + } + + cb->args[0] = i; + cb->args[1] = rqstp_index; + ret = skb->len; +out: + rcu_read_unlock(); + + return ret; +} + +int nfsd_server_nl_rpc_status_get_done(struct netlink_callback *cb) +{ + mutex_lock(&nfsd_mutex); + nfsd_put(sock_net(cb->skb->sk)); + mutex_unlock(&nfsd_mutex); + return 0; } @@ -1605,6 +1788,10 @@ static int __init init_nfsd(void) retval = register_filesystem(&nfsd_fs_type); if (retval) goto out_free_all; + retval = genl_register_family(&nfsd_server_nl_family); + if (retval) + goto out_free_all; + return 0; out_free_all: nfsd4_destroy_laundry_wq(); @@ -1629,6 +1816,7 @@ static int __init init_nfsd(void) static void __exit exit_nfsd(void) { + genl_unregister_family(&nfsd_server_nl_family); unregister_filesystem(&nfsd_fs_type); nfsd4_destroy_laundry_wq(); unregister_cld_notifier(); diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h index 11c14faa6c67..d787bd38c053 100644 --- a/fs/nfsd/nfsd.h +++ b/fs/nfsd/nfsd.h @@ -62,6 +62,22 @@ struct readdir_cd { __be32 err; /* 0, nfserr, or nfserr_eof */ }; +/* Maximum number of operations per session compound */ +#define NFSD_MAX_OPS_PER_COMPOUND 50 + +struct nfsd_genl_rqstp { + struct sockaddr daddr; + struct sockaddr saddr; + unsigned long rq_flags; + ktime_t rq_stime; + __be32 rq_xid; + u32 rq_vers; + u32 rq_prog; + u32 rq_proc; + /* NFSv4 compund */ + u32 opnum[NFSD_MAX_OPS_PER_COMPOUND]; + u16 opcnt; +}; extern struct svc_program nfsd_program; extern const struct svc_version nfsd_version2, nfsd_version3, nfsd_version4; diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c index 1582af33e204..fad34a7325b3 100644 --- a/fs/nfsd/nfssvc.c +++ b/fs/nfsd/nfssvc.c @@ -998,6 +998,15 @@ int nfsd_dispatch(struct svc_rqst *rqstp) if (!proc->pc_decode(rqstp, &rqstp->rq_arg_stream)) goto out_decode_err; + /* + * Release rq_status_counter setting it to an odd value after the rpc + * request has been properly parsed. rq_status_counter is used to + * notify the consumers if the rqstp fields are stable + * (rq_status_counter is odd) or not meaningful (rq_status_counter + * is even). + */ + smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter | 1); + rp = NULL; switch (nfsd_cache_lookup(rqstp, &rp)) { case RC_DOIT: @@ -1015,6 +1024,12 @@ int nfsd_dispatch(struct svc_rqst *rqstp) if (!proc->pc_encode(rqstp, &rqstp->rq_res_stream)) goto out_encode_err; + /* + * Release rq_status_counter setting it to an even value after the rpc + * request has been properly processed. + */ + smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter + 1); + nfsd_cache_update(rqstp, rp, rqstp->rq_cachetype, statp + 1); out_cached_reply: return 1; diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h index cbddcf484dba..41bdc913fa71 100644 --- a/fs/nfsd/state.h +++ b/fs/nfsd/state.h @@ -174,8 +174,6 @@ static inline struct nfs4_delegation *delegstateid(struct nfs4_stid *s) /* Maximum number of slots per session. 160 is useful for long haul TCP */ #define NFSD_MAX_SLOTS_PER_SESSION 160 -/* Maximum number of operations per session compound */ -#define NFSD_MAX_OPS_PER_COMPOUND 50 /* Maximum session per slot cache size */ #define NFSD_SLOT_CACHE_SIZE 2048 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */ diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index dbf5b21feafe..caa20defd255 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -251,6 +251,7 @@ struct svc_rqst { * net namespace */ void ** rq_lease_breaker; /* The v4 client breaking a lease */ + unsigned int rq_status_counter; /* RPC processing counter */ }; /* bits for rq_flags */