On Jun 29, Chuck Lever wrote: > On Thu, Jun 29, 2023 at 09:55:28AM -0400, Chuck Lever wrote: > > On Thu, Jun 29, 2023 at 12:17:33PM +0200, Lorenzo Bianconi wrote: > > > 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 > > > > Nice to see progress on this. > > > > Do you have a user space tool to monitor this file? > > > > > > > Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx> > > > --- > > > fs/nfsd/nfs4proc.c | 4 +-- > > > fs/nfsd/nfsctl.c | 18 ++++++++++++++ > > > fs/nfsd/nfsd.h | 2 ++ > > > fs/nfsd/nfssvc.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++ > > > net/sunrpc/svc.c | 2 +- > > > 5 files changed, 83 insertions(+), 4 deletions(-) > > > > > > diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c > > > index 5ae670807449..a4dd1ef104c3 100644 > > > --- a/fs/nfsd/nfs4proc.c > > > +++ b/fs/nfsd/nfs4proc.c > > > @@ -2452,8 +2452,6 @@ 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: > > > * > > > @@ -3583,7 +3581,7 @@ 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 1489e0b703b4..9d0b0a53510b 100644 > > > --- a/fs/nfsd/nfsctl.c > > > +++ b/fs/nfsd/nfsctl.c > > > @@ -57,6 +57,8 @@ enum { > > > NFSD_RecoveryDir, > > > NFSD_V4EndGrace, > > > #endif > > > + NFSD_Rpc_Status, > > > + > > > NFSD_MaxReserved > > > }; > > > > > > @@ -195,6 +197,21 @@ static inline struct net *netns(struct file *file) > > > return file_inode(file)->i_sb->s_fs_info; > > > } > > > > > > +static int nfsd_rpc_status_show(struct seq_file *m, void *v) > > > +{ > > > + struct nfsd_net *nn = net_generic(file_inode(m->file)->i_sb->s_fs_info, > > > + nfsd_net_id); > > > + > > > + mutex_lock(&nfsd_mutex); > > > + if (nn->nfsd_serv) > > > + nsfd_rpc_status(m, nn->nfsd_serv); > > > + mutex_unlock(&nfsd_mutex); > > > + > > > + return 0; > > > +} > > > + > > > +DEFINE_SHOW_ATTRIBUTE(nfsd_rpc_status); > > > + > > > /* > > > * write_unlock_ip - Release all locks used by a client > > > * > > > @@ -1400,6 +1417,7 @@ 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_fops, S_IRUGO}, > > > /* last one */ {""} > > > }; > > > > > > diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h > > > index d88498f8b275..a149157ec243 100644 > > > --- a/fs/nfsd/nfsd.h > > > +++ b/fs/nfsd/nfsd.h > > > @@ -87,6 +87,7 @@ bool nfssvc_encode_voidres(struct svc_rqst *rqstp, > > > */ > > > int nfsd_svc(int nrservs, struct net *net, const struct cred *cred); > > > int nfsd_dispatch(struct svc_rqst *rqstp); > > > +void nsfd_rpc_status(struct seq_file *m, struct svc_serv *serv); > > > > > > int nfsd_nrthreads(struct net *); > > > int nfsd_nrpools(struct net *); > > > @@ -506,6 +507,7 @@ 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) > > > { > > > diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c > > > index 9c7b1ef5be40..7a881f9a3a13 100644 > > > --- a/fs/nfsd/nfssvc.c > > > +++ b/fs/nfsd/nfssvc.c > > > @@ -1142,3 +1142,64 @@ int nfsd_pool_stats_release(struct inode *inode, struct file *file) > > > mutex_unlock(&nfsd_mutex); > > > return ret; > > > } > > > + > > > > Please add a kdoc comment here that describes the purpose of this > > function, its API contract, and any non-obvious assumptions. > > > > > > > +void nsfd_rpc_status(struct seq_file *m, struct svc_serv *serv) > > > +{ > > > + int i; > > > + > > > + lockdep_assert_held(&nfsd_mutex); > > > > The nfsd_mutex is held, I assume, to serialize with service > > shutdown. IMO you should add a comment to that effect. > > > > > + > > > + rcu_read_lock(); > > > > The RCU read lock protects the sp_all_threads list. OK. > > > > > + > > > + for (i = 0; i < serv->sv_nrpools; i++) { > > > + struct svc_rqst *rqstp; > > > + > > > + seq_puts(m, "XID | FLAGS | PROG |"); > > > + seq_puts(m, " VERS | PROC\t|"); > > > + seq_puts(m, " REMOTE - LOCAL IP ADDR"); > > > + seq_puts(m, "\t\t\t\t\t\t\t\t | NFS4 COMPOUND OPS\n"); > > > + list_for_each_entry_rcu(rqstp, > > > + &serv->sv_pools[i].sp_all_threads, > > > + rq_all) { > > > + if (!test_bit(RQ_BUSY, &rqstp->rq_flags)) > > > + continue; > > > + > > > + seq_printf(m, > > > + "0x%08x | 0x%08lx | 0x%08x | NFSv%d | %s\t|", > > > + be32_to_cpu(rqstp->rq_xid), rqstp->rq_flags, > > > + rqstp->rq_prog, rqstp->rq_vers, > > > + svc_proc_name(rqstp)); > > Had another thought on this. svc_rqst::rq_stime should be included here > because if both the XID and stime don't change between peeks into this > file, that's a sure sign that the transaction is not making progress. ack, I will add it. Regards, Lorenzo > > > > > + if (rqstp->rq_addr.ss_family == AF_INET) { > > > + seq_printf(m, " %pI4 - %pI4\t\t\t\t\t\t\t |", > > > + &((struct sockaddr_in *)&rqstp->rq_addr)->sin_addr, > > > + &((struct sockaddr_in *)&rqstp->rq_daddr)->sin_addr); > > > + } else if (rqstp->rq_addr.ss_family == AF_INET6) { > > > + seq_printf(m, " %pI6 - %pI6 |", > > > + &((struct sockaddr_in6 *)&rqstp->rq_addr)->sin6_addr, > > > + &((struct sockaddr_in6 *)&rqstp->rq_daddr)->sin6_addr); > > > + } else { > > > + seq_printf(m, " Unknown address family: %hu\n", > > > + rqstp->rq_addr.ss_family); > > > + continue; > > > + } > > > +#ifdef CONFIG_NFSD_V4 > > > + if (rqstp->rq_vers == NFS4_VERSION && > > > + rqstp->rq_proc == NFSPROC4_COMPOUND) { > > > + /* NFSv4 compund */ > > > + struct nfsd4_compoundargs *args = rqstp->rq_argp; > > > + struct nfsd4_compoundres *resp = rqstp->rq_resp; > > > + > > > + while (resp->opcnt < args->opcnt) { > > > + struct nfsd4_op *op = &args->ops[resp->opcnt++]; > > > + > > > + seq_printf(m, " %s", nfsd4_op_name(op->opnum)); > > > + } > > > + } > > > +#endif /* CONFIG_NFSD_V4 */ > > > + seq_puts(m, "\n"); > > > > My only quibble here is that the file format needs to be parsable > > by scripts as well as readable by humans. I'm not sure I have a > > specific comment, but it's something that needs some attention and > > verification (with, say, a sample user space tool, hint hint). > > > > > > > + } > > > + } > > > + > > > + rcu_read_unlock(); > > > +} > > > diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c > > > index e6d4cec61e47..f99cad92e9f4 100644 > > > --- a/net/sunrpc/svc.c > > > +++ b/net/sunrpc/svc.c > > > @@ -1625,7 +1625,7 @@ 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 > > >
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