mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 12:11:40 +00:00
NFSD: add rpc_status netlink support
Introduce rpc_status netlink support for NFSD in order to dump pending RPC requests debugging information from userspace. Closes: https://bugzilla.linux-nfs.org/show_bug.cgi?id=366 Tested-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Lorenzo Bianconi
Chuck Lever
parent
13727f85b4
commit
bd9d6a3efa
188
fs/nfsd/nfsctl.c
188
fs/nfsd/nfsctl.c
@ -1496,19 +1496,200 @@ static int create_proc_exports_entry(void)
|
||||
|
||||
unsigned int nfsd_net_id;
|
||||
|
||||
/**
|
||||
* nfsd_nl_rpc_status_get_start - Prepare rpc_status_get dumpit
|
||||
* @cb: netlink metadata and command arguments
|
||||
*
|
||||
* Return values:
|
||||
* %0: The rpc_status_get command may proceed
|
||||
* %-ENODEV: There is no NFSD running in this namespace
|
||||
*/
|
||||
int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb)
|
||||
{
|
||||
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;
|
||||
}
|
||||
|
||||
static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb,
|
||||
struct netlink_callback *cb,
|
||||
struct nfsd_genl_rqstp *rqstp)
|
||||
{
|
||||
void *hdr;
|
||||
u32 i;
|
||||
|
||||
hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
|
||||
&nfsd_nl_family, 0, NFSD_CMD_RPC_STATUS_GET);
|
||||
if (!hdr)
|
||||
return -ENOBUFS;
|
||||
|
||||
if (nla_put_be32(skb, NFSD_A_RPC_STATUS_XID, rqstp->rq_xid) ||
|
||||
nla_put_u32(skb, NFSD_A_RPC_STATUS_FLAGS, rqstp->rq_flags) ||
|
||||
nla_put_u32(skb, NFSD_A_RPC_STATUS_PROG, rqstp->rq_prog) ||
|
||||
nla_put_u32(skb, NFSD_A_RPC_STATUS_PROC, rqstp->rq_proc) ||
|
||||
nla_put_u8(skb, NFSD_A_RPC_STATUS_VERSION, rqstp->rq_vers) ||
|
||||
nla_put_s64(skb, NFSD_A_RPC_STATUS_SERVICE_TIME,
|
||||
ktime_to_us(rqstp->rq_stime),
|
||||
NFSD_A_RPC_STATUS_PAD))
|
||||
return -ENOBUFS;
|
||||
|
||||
switch (rqstp->rq_saddr.sa_family) {
|
||||
case AF_INET: {
|
||||
const struct sockaddr_in *s_in, *d_in;
|
||||
|
||||
s_in = (const struct sockaddr_in *)&rqstp->rq_saddr;
|
||||
d_in = (const struct sockaddr_in *)&rqstp->rq_daddr;
|
||||
if (nla_put_in_addr(skb, NFSD_A_RPC_STATUS_SADDR4,
|
||||
s_in->sin_addr.s_addr) ||
|
||||
nla_put_in_addr(skb, NFSD_A_RPC_STATUS_DADDR4,
|
||||
d_in->sin_addr.s_addr) ||
|
||||
nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
|
||||
s_in->sin_port) ||
|
||||
nla_put_be16(skb, NFSD_A_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->rq_saddr;
|
||||
d_in = (const struct sockaddr_in6 *)&rqstp->rq_daddr;
|
||||
if (nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_SADDR6,
|
||||
&s_in->sin6_addr) ||
|
||||
nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_DADDR6,
|
||||
&d_in->sin6_addr) ||
|
||||
nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
|
||||
s_in->sin6_port) ||
|
||||
nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
|
||||
d_in->sin6_port))
|
||||
return -ENOBUFS;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
for (i = 0; i < rqstp->rq_opcnt; i++)
|
||||
if (nla_put_u32(skb, NFSD_A_RPC_STATUS_COMPOUND_OPS,
|
||||
rqstp->rq_opnum[i]))
|
||||
return -ENOBUFS;
|
||||
|
||||
genlmsg_end(skb, hdr);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* nfsd_nl_rpc_status_get_dumpit - Handle rpc_status_get dumpit
|
||||
* @skb: reply buffer
|
||||
* @cb: netlink metadata and command arguments
|
||||
*
|
||||
* Returns the size of the reply or a negative errno.
|
||||
*/
|
||||
int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
|
||||
struct netlink_callback *cb)
|
||||
{
|
||||
return 0;
|
||||
struct nfsd_net *nn = net_generic(sock_net(skb->sk), nfsd_net_id);
|
||||
int i, ret, rqstp_index = 0;
|
||||
|
||||
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.rq_opcnt = 0;
|
||||
memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp),
|
||||
sizeof(struct sockaddr));
|
||||
memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp),
|
||||
sizeof(struct sockaddr));
|
||||
|
||||
#ifdef CONFIG_NFSD_V4
|
||||
if (rqstp->rq_vers == NFS4_VERSION &&
|
||||
rqstp->rq_proc == NFSPROC4_COMPOUND) {
|
||||
/* NFSv4 compound */
|
||||
struct nfsd4_compoundargs *args;
|
||||
int j;
|
||||
|
||||
args = rqstp->rq_argp;
|
||||
genl_rqstp.rq_opcnt = args->opcnt;
|
||||
for (j = 0; j < genl_rqstp.rq_opcnt; j++)
|
||||
genl_rqstp.rq_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;
|
||||
}
|
||||
|
||||
/**
|
||||
* nfsd_nl_rpc_status_get_done - rpc_status_get dumpit post-processing
|
||||
* @cb: netlink metadata and command arguments
|
||||
*
|
||||
* Return values:
|
||||
* %0: Success
|
||||
*/
|
||||
int nfsd_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;
|
||||
}
|
||||
|
||||
@ -1606,6 +1787,10 @@ static int __init init_nfsd(void)
|
||||
retval = register_filesystem(&nfsd_fs_type);
|
||||
if (retval)
|
||||
goto out_free_all;
|
||||
retval = genl_register_family(&nfsd_nl_family);
|
||||
if (retval)
|
||||
goto out_free_all;
|
||||
|
||||
return 0;
|
||||
out_free_all:
|
||||
nfsd4_destroy_laundry_wq();
|
||||
@ -1630,6 +1815,7 @@ out_free_slabs:
|
||||
|
||||
static void __exit exit_nfsd(void)
|
||||
{
|
||||
genl_unregister_family(&nfsd_nl_family);
|
||||
unregister_filesystem(&nfsd_fs_type);
|
||||
nfsd4_destroy_laundry_wq();
|
||||
unregister_cld_notifier();
|
||||
|
||||
@ -62,6 +62,23 @@ 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 rq_daddr;
|
||||
struct sockaddr rq_saddr;
|
||||
unsigned long rq_flags;
|
||||
ktime_t rq_stime;
|
||||
__be32 rq_xid;
|
||||
u32 rq_vers;
|
||||
u32 rq_prog;
|
||||
u32 rq_proc;
|
||||
|
||||
/* NFSv4 compound */
|
||||
u32 rq_opcnt;
|
||||
u32 rq_opnum[NFSD_MAX_OPS_PER_COMPOUND];
|
||||
};
|
||||
|
||||
extern struct svc_program nfsd_program;
|
||||
extern const struct svc_version nfsd_version2, nfsd_version3, nfsd_version4;
|
||||
|
||||
@ -997,6 +997,15 @@ 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:
|
||||
@ -1014,6 +1023,12 @@ 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;
|
||||
|
||||
@ -195,8 +195,6 @@ 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 */
|
||||
|
||||
@ -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 */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user