Introduce rpc_status entry in nfsd debug filesystem in order to dump pending RPC requests debugging information. Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=366 Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx> --- fs/nfsd/nfs4proc.c | 4 +- fs/nfsd/nfsctl.c | 9 +++ fs/nfsd/nfsd.h | 7 ++ fs/nfsd/nfssvc.c | 140 +++++++++++++++++++++++++++++++++++++ include/linux/sunrpc/svc.h | 1 + net/sunrpc/svc.c | 2 +- 6 files changed, 159 insertions(+), 4 deletions(-) diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index f0f318e78630..b7ad3081bc36 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -2497,8 +2497,6 @@ static inline void nfsd4_increment_op_stats(u32 opnum) static const struct nfsd4_operation nfsd4_ops[]; -static const char *nfsd4_op_name(unsigned opnum); - /* * Enforce NFSv4.1 COMPOUND ordering rules: * @@ -3628,7 +3626,7 @@ void warn_on_nonidempotent_op(struct nfsd4_op *op) } } -static const char *nfsd4_op_name(unsigned opnum) +const char *nfsd4_op_name(unsigned opnum) { if (opnum < ARRAY_SIZE(nfsd4_ops)) return nfsd4_ops[opnum].op_name; diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index 35d2e2cde1eb..d47b98bad96e 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -47,6 +47,7 @@ enum { NFSD_MaxBlkSize, NFSD_MaxConnections, NFSD_Filecache, + NFSD_Rpc_Status, /* * The below MUST come last. Otherwise we leave a hole in nfsd_files[] * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops @@ -195,6 +196,13 @@ static inline struct net *netns(struct file *file) return file_inode(file)->i_sb->s_fs_info; } +static const struct file_operations nfsd_rpc_status_operations = { + .open = nfsd_rpc_status_open, + .read = seq_read, + .llseek = seq_lseek, + .release = nfsd_pool_stats_release, +}; + /* * write_unlock_ip - Release all locks used by a client * @@ -1400,6 +1408,7 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc) [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO}, #endif + [NFSD_Rpc_Status] = {"rpc_status", &nfsd_rpc_status_operations, S_IRUGO}, /* last one */ {""} }; diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h index d88498f8b275..50c82bb42e88 100644 --- a/fs/nfsd/nfsd.h +++ b/fs/nfsd/nfsd.h @@ -94,6 +94,7 @@ int nfsd_get_nrthreads(int n, int *, struct net *); int nfsd_set_nrthreads(int n, int *, struct net *); int nfsd_pool_stats_open(struct inode *, struct file *); int nfsd_pool_stats_release(struct inode *, struct file *); +int nfsd_rpc_status_open(struct inode *inode, struct file *file); void nfsd_shutdown_threads(struct net *net); void nfsd_put(struct net *net); @@ -506,12 +507,18 @@ extern void nfsd4_ssc_init_umount_work(struct nfsd_net *nn); extern void nfsd4_init_leases_net(struct nfsd_net *nn); +const char *nfsd4_op_name(unsigned opnum); #else /* CONFIG_NFSD_V4 */ static inline int nfsd4_is_junction(struct dentry *dentry) { return 0; } +static inline const char *nfsd4_op_name(unsigned opnum) +{ + return "unknown_operation"; +} + static inline void nfsd4_init_leases_net(struct nfsd_net *nn) { }; #define register_cld_notifier() 0 diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c index 97830e28c140..5e115dbbe9dc 100644 --- a/fs/nfsd/nfssvc.c +++ b/fs/nfsd/nfssvc.c @@ -1057,6 +1057,15 @@ 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: @@ -1074,6 +1083,12 @@ 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; @@ -1149,3 +1164,128 @@ int nfsd_pool_stats_release(struct inode *inode, struct file *file) mutex_unlock(&nfsd_mutex); return ret; } + +static int nfsd_rpc_status_show(struct seq_file *m, void *v) +{ + struct inode *inode = file_inode(m->file); + struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id); + int i; + + rcu_read_lock(); + + for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) { + struct svc_rqst *rqstp; + + list_for_each_entry_rcu(rqstp, + &nn->nfsd_serv->sv_pools[i].sp_all_threads, + rq_all) { + struct { + struct sockaddr daddr; + struct sockaddr saddr; + unsigned long rq_flags; + const char *pc_name; + ktime_t rq_stime; + __be32 rq_xid; + u32 rq_prog; + u32 rq_vers; + /* NFSv4 compund */ + u32 opnum[NFSD_MAX_OPS_PER_COMPOUND]; + u8 opcnt; + } rqstp_info; + unsigned int status_counter; + char buf[RPC_MAX_ADDRBUFLEN]; + int j; + + /* + * 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; + + rqstp_info.rq_xid = rqstp->rq_xid; + rqstp_info.rq_flags = rqstp->rq_flags; + rqstp_info.rq_prog = rqstp->rq_prog; + rqstp_info.rq_vers = rqstp->rq_vers; + rqstp_info.pc_name = svc_proc_name(rqstp); + rqstp_info.rq_stime = rqstp->rq_stime; + rqstp_info.opcnt = 0; + memcpy(&rqstp_info.daddr, svc_daddr(rqstp), + sizeof(struct sockaddr)); + memcpy(&rqstp_info.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 = rqstp->rq_argp; + + rqstp_info.opcnt = args->opcnt; + for (j = 0; j < rqstp_info.opcnt; j++) { + struct nfsd4_op *op = &args->ops[j]; + + rqstp_info.opnum[j] = op->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; + + seq_printf(m, + "0x%08x 0x%08lx 0x%08x NFSv%d %s %016lld", + be32_to_cpu(rqstp_info.rq_xid), + rqstp_info.rq_flags, + rqstp_info.rq_prog, + rqstp_info.rq_vers, + rqstp_info.pc_name, + ktime_to_us(rqstp_info.rq_stime)); + seq_printf(m, " %s", + __svc_print_addr(&rqstp_info.saddr, buf, + sizeof(buf), false)); + seq_printf(m, " %s", + __svc_print_addr(&rqstp_info.daddr, buf, + sizeof(buf), false)); + for (j = 0; j < rqstp_info.opcnt; j++) + seq_printf(m, " %s", + nfsd4_op_name(rqstp_info.opnum[j])); + seq_puts(m, "\n"); + } + } + + rcu_read_unlock(); + + return 0; +} + +/** + * nfsd_rpc_status_open - open routine for nfsd_rpc_status handler + * @inode: entry inode pointer. + * @file: entry file pointer. + * + * nfsd_rpc_status_open is the open routine for nfsd_rpc_status procfs handler. + * nfsd_rpc_status dumps pending RPC requests info queued into nfs server. + */ +int nfsd_rpc_status_open(struct inode *inode, struct file *file) +{ + struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id); + + mutex_lock(&nfsd_mutex); + if (!nn->nfsd_serv) { + mutex_unlock(&nfsd_mutex); + return -ENODEV; + } + + svc_get(nn->nfsd_serv); + mutex_unlock(&nfsd_mutex); + + return single_open(file, nfsd_rpc_status_show, inode->i_private); +} diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index fe1394cc1371..542a60b78bab 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -270,6 +270,7 @@ struct svc_rqst { * net namespace */ void ** rq_lease_breaker; /* The v4 client breaking a lease */ + unsigned int rq_status_counter; /* RPC processing counter */ }; #define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net) diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index 587811a002c9..44eac83b35a1 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -1629,7 +1629,7 @@ const char *svc_proc_name(const struct svc_rqst *rqstp) return rqstp->rq_procinfo->pc_name; return "unknown"; } - +EXPORT_SYMBOL_GPL(svc_proc_name); /** * svc_encode_result_payload - mark a range of bytes as a result payload -- 2.41.0
