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proc: introduce proc_create_net_single 

Variant of proc_create_data that directly take a seq_file show
callback and deals with network namespaces in ->open and ->release.
All callers of proc_create + single_open_net converted over, and
single_{open,release}_net are removed entirely.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2018-04-13 20:38:35 +02:00
parent c350637227
commit 3617d9496c
13 changed files with 86 additions and 307 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
fs/proc/proc_net.c
View File

@ -93,37 +93,50 @@ struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
}
EXPORT_SYMBOL_GPL(proc_create_net_data);
int single_open_net(struct inode *inode, struct file *file,
int (*show)(struct seq_file *, void *))
static int single_open_net(struct inode *inode, struct file *file)
{
int err;
struct proc_dir_entry *de = PDE(inode);
struct net *net;
int err;
err = -ENXIO;
net = get_proc_net(inode);
if (net == NULL)
goto err_net;
if (!net)
return -ENXIO;
err = single_open(file, show, net);
if (err < 0)
goto err_open;
return 0;
err_open:
err = single_open(file, de->single_show, net);
if (err)
put_net(net);
err_net:
return err;
}
EXPORT_SYMBOL_GPL(single_open_net);
int single_release_net(struct inode *ino, struct file *f)
static int single_release_net(struct inode *ino, struct file *f)
{
struct seq_file *seq = f->private_data;
put_net(seq->private);
return single_release(ino, f);
}
EXPORT_SYMBOL_GPL(single_release_net);
static const struct file_operations proc_net_single_fops = {
.open = single_open_net,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
struct proc_dir_entry *parent,
int (*show)(struct seq_file *, void *), void *data)
{
struct proc_dir_entry *p;
p = proc_create_reg(name, mode, &parent, data);
if (!p)
return NULL;
p->proc_fops = &proc_net_single_fops;
p->single_show = show;
return proc_register(parent, p);
}
EXPORT_SYMBOL_GPL(proc_create_net_single);
static struct net *get_proc_task_net(struct inode *dir)
{

4
include/linux/proc_fs.h
View File

@ -58,6 +58,9 @@ struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
unsigned int state_size, void *data);
#define proc_create_net(name, mode, parent, state_size, ops) \
proc_create_net_data(name, mode, parent, state_size, ops, NULL)
struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
struct proc_dir_entry *parent,
int (*show)(struct seq_file *, void *), void *data);
#else /* CONFIG_PROC_FS */
@ -97,6 +100,7 @@ static inline int remove_proc_subtree(const char *name, struct proc_dir_entry *p
#define proc_create_net_data(name, mode, parent, ops, state_size, data) ({NULL;})
#define proc_create_net(name, mode, parent, state_size, ops) ({NULL;})
#define proc_create_net_single(name, mode, parent, show, data) ({NULL;})
#endif /* CONFIG_PROC_FS */

7
include/linux/seq_file_net.h
View File

@ -13,9 +13,6 @@ struct seq_net_private {
#endif
};
int single_open_net(struct inode *, struct file *file,
int (*show)(struct seq_file *, void *));
int single_release_net(struct inode *, struct file *);
static inline struct net *seq_file_net(struct seq_file *seq)
{
#ifdef CONFIG_NET_NS
@ -26,8 +23,8 @@ static inline struct net *seq_file_net(struct seq_file *seq)
}
/*
* This one is needed for single_open_net since net is stored directly in
* private not as a struct i.e. seq_file_net can't be used.
* This one is needed for proc_create_net_single since net is stored directly
* in private not as a struct i.e. seq_file_net can't be used.
*/
static inline struct net *seq_file_single_net(struct seq_file *seq)
{

16
net/can/bcm.c
View File

@ -239,18 +239,6 @@ static int bcm_proc_show(struct seq_file *m, void *v)
seq_putc(m, '\n');
return 0;
}
static int bcm_proc_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, bcm_proc_show);
}
static const struct file_operations bcm_proc_fops = {
.open = bcm_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
#endif /* CONFIG_PROC_FS */
/*
@ -1606,9 +1594,9 @@ static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
if (net->can.bcmproc_dir) {
/* unique socket address as filename */
sprintf(bo->procname, "%lu", sock_i_ino(sk));
bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
bo->bcm_proc_read = proc_create_net_single(bo->procname, 0644,
net->can.bcmproc_dir,
&bcm_proc_fops, sk);
bcm_proc_show, sk);
if (!bo->bcm_proc_read) {
ret = -ENOMEM;
goto fail;

119
net/can/proc.c
View File

@ -270,18 +270,6 @@ static int can_stats_proc_show(struct seq_file *m, void *v)
return 0;
}
static int can_stats_proc_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, can_stats_proc_show);
}
static const struct file_operations can_stats_proc_fops = {
.open = can_stats_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
static int can_reset_stats_proc_show(struct seq_file *m, void *v)
{
struct net *net = m->private;
@ -303,36 +291,12 @@ static int can_reset_stats_proc_show(struct seq_file *m, void *v)
return 0;
}
static int can_reset_stats_proc_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, can_reset_stats_proc_show);
}
static const struct file_operations can_reset_stats_proc_fops = {
.open = can_reset_stats_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int can_version_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%s\n", CAN_VERSION_STRING);
return 0;
}
static int can_version_proc_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, can_version_proc_show);
}
static const struct file_operations can_version_proc_fops = {
.open = can_version_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
struct net_device *dev,
struct can_dev_rcv_lists *d)
@ -373,18 +337,6 @@ static int can_rcvlist_proc_show(struct seq_file *m, void *v)
return 0;
}
static int can_rcvlist_proc_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, can_rcvlist_proc_show);
}
static const struct file_operations can_rcvlist_proc_fops = {
.open = can_rcvlist_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static inline void can_rcvlist_proc_show_array(struct seq_file *m,
struct net_device *dev,
struct hlist_head *rcv_array,
@ -440,19 +392,6 @@ static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v)
return 0;
}
static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, can_rcvlist_sff_proc_show);
}
static const struct file_operations can_rcvlist_sff_proc_fops = {
.open = can_rcvlist_sff_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v)
{
struct net_device *dev;
@ -483,18 +422,6 @@ static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v)
return 0;
}
static int can_rcvlist_eff_proc_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, can_rcvlist_eff_proc_show);
}
static const struct file_operations can_rcvlist_eff_proc_fops = {
.open = can_rcvlist_eff_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
/*
* can_init_proc - create main CAN proc directory and procfs entries
*/
@ -510,37 +437,29 @@ void can_init_proc(struct net *net)
}
/* own procfs entries from the AF_CAN core */
net->can.pde_version = proc_create(CAN_PROC_VERSION, 0644,
net->can.proc_dir,
&can_version_proc_fops);
net->can.pde_stats = proc_create(CAN_PROC_STATS, 0644,
net->can.proc_dir,
&can_stats_proc_fops);
net->can.pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644,
net->can.proc_dir,
&can_reset_stats_proc_fops);
net->can.pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644,
net->can.proc_dir,
&can_rcvlist_proc_fops,
net->can.pde_version = proc_create_net_single(CAN_PROC_VERSION, 0644,
net->can.proc_dir, can_version_proc_show, NULL);
net->can.pde_stats = proc_create_net_single(CAN_PROC_STATS, 0644,
net->can.proc_dir, can_stats_proc_show, NULL);
net->can.pde_reset_stats = proc_create_net_single(CAN_PROC_RESET_STATS,
0644, net->can.proc_dir, can_reset_stats_proc_show,
NULL);
net->can.pde_rcvlist_err = proc_create_net_single(CAN_PROC_RCVLIST_ERR,
0644, net->can.proc_dir, can_rcvlist_proc_show,
(void *)RX_ERR);
net->can.pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644,
net->can.proc_dir,
&can_rcvlist_proc_fops,
net->can.pde_rcvlist_all = proc_create_net_single(CAN_PROC_RCVLIST_ALL,
0644, net->can.proc_dir, can_rcvlist_proc_show,
(void *)RX_ALL);
net->can.pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644,
net->can.proc_dir,
&can_rcvlist_proc_fops,
net->can.pde_rcvlist_fil = proc_create_net_single(CAN_PROC_RCVLIST_FIL,
0644, net->can.proc_dir, can_rcvlist_proc_show,
(void *)RX_FIL);
net->can.pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644,
net->can.proc_dir,
&can_rcvlist_proc_fops,
net->can.pde_rcvlist_inv = proc_create_net_single(CAN_PROC_RCVLIST_INV,
0644, net->can.proc_dir, can_rcvlist_proc_show,
(void *)RX_INV);
net->can.pde_rcvlist_eff = proc_create(CAN_PROC_RCVLIST_EFF, 0644,
net->can.proc_dir,
&can_rcvlist_eff_proc_fops);
net->can.pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644,
net->can.proc_dir,
&can_rcvlist_sff_proc_fops);
net->can.pde_rcvlist_eff = proc_create_net_single(CAN_PROC_RCVLIST_EFF,
0644, net->can.proc_dir, can_rcvlist_eff_proc_show, NULL);
net->can.pde_rcvlist_sff = proc_create_net_single(CAN_PROC_RCVLIST_SFF,
0644, net->can.proc_dir, can_rcvlist_sff_proc_show, NULL);
}
/*

16
net/ipv4/fib_trie.c
View File

@ -2348,18 +2348,6 @@ static int fib_triestat_seq_show(struct seq_file *seq, void *v)
return 0;
}
static int fib_triestat_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, fib_triestat_seq_show);
}
static const struct file_operations fib_triestat_fops = {
.open = fib_triestat_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
static struct key_vector *fib_trie_get_idx(struct seq_file *seq, loff_t pos)
{
struct fib_trie_iter *iter = seq->private;
@ -2719,8 +2707,8 @@ int __net_init fib_proc_init(struct net *net)
sizeof(struct fib_trie_iter)))
goto out1;
if (!proc_create("fib_triestat", 0444, net->proc_net,
&fib_triestat_fops))
if (!proc_create_net_single("fib_triestat", 0444, net->proc_net,
fib_triestat_seq_show, NULL))
goto out2;
if (!proc_create_net("route", 0444, net->proc_net, &fib_route_seq_ops,

48
net/ipv4/proc.c
View File

@ -77,18 +77,6 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
return 0;
}
static int sockstat_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, sockstat_seq_show);
}
static const struct file_operations sockstat_seq_fops = {
.open = sockstat_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
/* snmp items */
static const struct snmp_mib snmp4_ipstats_list[] = {
SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),
@ -460,20 +448,6 @@ static int snmp_seq_show(struct seq_file *seq, void *v)
return 0;
}
static int snmp_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, snmp_seq_show);
}
static const struct file_operations snmp_seq_fops = {
.open = snmp_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
/*
* Output /proc/net/netstat
*/
@ -507,26 +481,16 @@ static int netstat_seq_show(struct seq_file *seq, void *v)
return 0;
}
static int netstat_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, netstat_seq_show);
}
static const struct file_operations netstat_seq_fops = {
.open = netstat_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
static __net_init int ip_proc_init_net(struct net *net)
{
if (!proc_create("sockstat", 0444, net->proc_net,
&sockstat_seq_fops))
if (!proc_create_net_single("sockstat", 0444, net->proc_net,
sockstat_seq_show, NULL))
goto out_sockstat;
if (!proc_create("netstat", 0444, net->proc_net, &netstat_seq_fops))
if (!proc_create_net_single("netstat", 0444, net->proc_net,
netstat_seq_show, NULL))
goto out_netstat;
if (!proc_create("snmp", 0444, net->proc_net, &snmp_seq_fops))
if (!proc_create_net_single("snmp", 0444, net->proc_net, snmp_seq_show,
NULL))
goto out_snmp;
return 0;

31
net/ipv6/proc.c
View File

@ -53,18 +53,6 @@ static int sockstat6_seq_show(struct seq_file *seq, void *v)
return 0;
}
static int sockstat6_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, sockstat6_seq_show);
}
static const struct file_operations sockstat6_seq_fops = {
.open = sockstat6_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
static const struct snmp_mib snmp6_ipstats_list[] = {
/* ipv6 mib according to RFC 2465 */
SNMP_MIB_ITEM("Ip6InReceives", IPSTATS_MIB_INPKTS),
@ -242,18 +230,6 @@ static int snmp6_seq_show(struct seq_file *seq, void *v)
return 0;
}
static int snmp6_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, snmp6_seq_show);
}
static const struct file_operations snmp6_seq_fops = {
.open = snmp6_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
static int snmp6_dev_seq_show(struct seq_file *seq, void *v)
{
struct inet6_dev *idev = (struct inet6_dev *)seq->private;
@ -302,11 +278,12 @@ int snmp6_unregister_dev(struct inet6_dev *idev)
static int __net_init ipv6_proc_init_net(struct net *net)
{
if (!proc_create("sockstat6", 0444, net->proc_net,
&sockstat6_seq_fops))
if (!proc_create_net_single("sockstat6", 0444, net->proc_net,
sockstat6_seq_show, NULL))
return -ENOMEM;
if (!proc_create("snmp6", 0444, net->proc_net, &snmp6_seq_fops))
if (!proc_create_net_single("snmp6", 0444, net->proc_net,
snmp6_seq_show, NULL))
goto proc_snmp6_fail;
net->mib.proc_net_devsnmp6 = proc_mkdir("dev_snmp6", net->proc_net);

15
net/ipv6/route.c
View File

@ -4876,18 +4876,6 @@ static int rt6_stats_seq_show(struct seq_file *seq, void *v)
return 0;
}
static int rt6_stats_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, rt6_stats_seq_show);
}
static const struct file_operations rt6_stats_seq_fops = {
.open = rt6_stats_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
#endif /* CONFIG_PROC_FS */
#ifdef CONFIG_SYSCTL
@ -5094,7 +5082,8 @@ static int __net_init ip6_route_net_init_late(struct net *net)
#ifdef CONFIG_PROC_FS
proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops,
sizeof(struct ipv6_route_iter));
proc_create("rt6_stats", 0444, net->proc_net, &rt6_stats_seq_fops);
proc_create_net_single("rt6_stats", 0444, net->proc_net,
rt6_stats_seq_show, NULL);
#endif
return 0;
}

16
net/kcm/kcmproc.c
View File

@ -345,22 +345,10 @@ static int kcm_stats_seq_show(struct seq_file *seq, void *v)
return 0;
}
static int kcm_stats_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, kcm_stats_seq_show);
}
static const struct file_operations kcm_stats_seq_fops = {
.open = kcm_stats_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
static int kcm_proc_init_net(struct net *net)
{
if (!proc_create("kcm_stats", 0444, net->proc_net,
&kcm_stats_seq_fops))
if (!proc_create_net_single("kcm_stats", 0444, net->proc_net,
kcm_stats_seq_show, NULL))
goto out_kcm_stats;
if (!proc_create_net("kcm", 0444, net->proc_net, &kcm_seq_ops,

31
net/netfilter/ipvs/ip_vs_ctl.c
View File

@ -2141,18 +2141,6 @@ static int ip_vs_stats_show(struct seq_file *seq, void *v)
return 0;
}
static int ip_vs_stats_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, ip_vs_stats_show);
}
static const struct file_operations ip_vs_stats_fops = {
.open = ip_vs_stats_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
{
struct net *net = seq_file_single_net(seq);
@ -2208,18 +2196,6 @@ static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
return 0;
}
static int ip_vs_stats_percpu_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, ip_vs_stats_percpu_show);
}
static const struct file_operations ip_vs_stats_percpu_fops = {
.open = ip_vs_stats_percpu_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
#endif
/*
@ -4019,9 +3995,10 @@ int __net_init ip_vs_control_net_init(struct netns_ipvs *ipvs)
proc_create_net("ip_vs", 0, ipvs->net->proc_net, &ip_vs_info_seq_ops,
sizeof(struct ip_vs_iter));
proc_create("ip_vs_stats", 0, ipvs->net->proc_net, &ip_vs_stats_fops);
proc_create("ip_vs_stats_percpu", 0, ipvs->net->proc_net,
&ip_vs_stats_percpu_fops);
proc_create_net_single("ip_vs_stats", 0, ipvs->net->proc_net,
ip_vs_stats_show, NULL);
proc_create_net_single("ip_vs_stats_percpu", 0, ipvs->net->proc_net,
ip_vs_stats_percpu_show, NULL);
if (ip_vs_control_net_init_sysctl(ipvs))
goto err;

17
net/sctp/proc.c
View File

@ -88,19 +88,6 @@ static int sctp_snmp_seq_show(struct seq_file *seq, void *v)
return 0;
}
/* Initialize the seq file operations for 'snmp' object. */
static int sctp_snmp_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, sctp_snmp_seq_show);
}
static const struct file_operations sctp_snmp_seq_fops = {
.open = sctp_snmp_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
/* Dump local addresses of an association/endpoint. */
static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_common *epb)
{
@ -408,8 +395,8 @@ int __net_init sctp_proc_init(struct net *net)
net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
if (!net->sctp.proc_net_sctp)
return -ENOMEM;
if (!proc_create("snmp", 0444, net->sctp.proc_net_sctp,
&sctp_snmp_seq_fops))
if (!proc_create_net_single("snmp", 0444, net->sctp.proc_net_sctp,
sctp_snmp_seq_show, NULL))
goto cleanup;
if (!proc_create_net("eps", 0444, net->sctp.proc_net_sctp,
&sctp_eps_ops, sizeof(struct seq_net_private)))

16
net/xfrm/xfrm_proc.c
View File

@ -65,22 +65,10 @@ static int xfrm_statistics_seq_show(struct seq_file *seq, void *v)
return 0;
}
static int xfrm_statistics_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, xfrm_statistics_seq_show);
}
static const struct file_operations xfrm_statistics_seq_fops = {
.open = xfrm_statistics_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
int __net_init xfrm_proc_init(struct net *net)
{
if (!proc_create("xfrm_stat", 0444, net->proc_net,
&xfrm_statistics_seq_fops))
if (!proc_create_net_single("xfrm_stat", 0444, net->proc_net,
xfrm_statistics_seq_show, NULL))
return -ENOMEM;
return 0;
}