[PATCH 07/42] proc: introduce proc_create_seq_private

From: Christoph Hellwig
Date: Wed May 16 2018 - 05:42:23 EST

Variant of proc_create_data that directly take a struct seq_operations
argument + a private state size and drastically reduces the boilerplate
code in the callers.

All trivial callers converted over.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/locks.c | 16 ++--------------
fs/proc/generic.c | 9 ++++++---
fs/proc/internal.h | 1 +
include/linux/atalk.h | 7 ++++++-
include/linux/proc_fs.h | 9 ++++++---
kernel/time/timer_list.c | 16 ++--------------
mm/vmalloc.c | 18 +++---------------
net/appletalk/aarp.c | 20 +-------------------
net/appletalk/atalk_proc.c | 3 ++-
net/atm/lec.c | 15 ++-------------
net/decnet/af_decnet.c | 17 +++--------------
net/decnet/dn_route.c | 19 +++----------------
12 files changed, 37 insertions(+), 113 deletions(-)

diff --git a/fs/locks.c b/fs/locks.c
index 62bbe8b31f26..05e211be8684 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -2788,22 +2788,10 @@ static const struct seq_operations locks_seq_operations = {
.show = locks_show,
};

-static int locks_open(struct inode *inode, struct file *filp)
-{
- return seq_open_private(filp, &locks_seq_operations,
- sizeof(struct locks_iterator));
-}
-
-static const struct file_operations proc_locks_operations = {
- .open = locks_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_private,
-};
-
static int __init proc_locks_init(void)
{
- proc_create("locks", 0, NULL, &proc_locks_operations);
+ proc_create_seq_private("locks", 0, NULL, &locks_seq_operations,
+ sizeof(struct locks_iterator), NULL);
return 0;
}
fs_initcall(proc_locks_init);
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index af644caaaf85..f87cb0053387 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -560,6 +560,8 @@ static int proc_seq_open(struct inode *inode, struct file *file)
{
struct proc_dir_entry *de = PDE(inode);

+ if (de->state_size)
+ return seq_open_private(file, de->seq_ops, de->state_size);
return seq_open(file, de->seq_ops);
}

@@ -570,9 +572,9 @@ static const struct file_operations proc_seq_fops = {
.release = seq_release,
};

-struct proc_dir_entry *proc_create_seq_data(const char *name, umode_t mode,
+struct proc_dir_entry *proc_create_seq_private(const char *name, umode_t mode,
struct proc_dir_entry *parent, const struct seq_operations *ops,
- void *data)
+ unsigned int state_size, void *data)
{
struct proc_dir_entry *p;

@@ -581,9 +583,10 @@ struct proc_dir_entry *proc_create_seq_data(const char *name, umode_t mode,
return NULL;
p->proc_fops = &proc_seq_fops;
p->seq_ops = ops;
+ p->state_size = state_size;
return proc_register(parent, p);
}
-EXPORT_SYMBOL(proc_create_seq_data);
+EXPORT_SYMBOL(proc_create_seq_private);

void proc_set_size(struct proc_dir_entry *de, loff_t size)
{
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 4fb01c5f9c1a..bcfe830ffd59 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -46,6 +46,7 @@ struct proc_dir_entry {
const struct file_operations *proc_fops;
const struct seq_operations *seq_ops;
void *data;
+ unsigned int state_size;
unsigned int low_ino;
nlink_t nlink;
kuid_t uid;
diff --git a/include/linux/atalk.h b/include/linux/atalk.h
index 40373920ea58..23f805562f4e 100644
--- a/include/linux/atalk.h
+++ b/include/linux/atalk.h
@@ -145,7 +145,12 @@ extern rwlock_t atalk_interfaces_lock;

extern struct atalk_route atrtr_default;

-extern const struct file_operations atalk_seq_arp_fops;
+struct aarp_iter_state {
+ int bucket;
+ struct aarp_entry **table;
+};
+
+extern const struct seq_operations aarp_seq_ops;

extern int sysctl_aarp_expiry_time;
extern int sysctl_aarp_tick_time;
diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index f368a896a8cb..314713a48817 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -25,11 +25,13 @@ extern struct proc_dir_entry *proc_mkdir_mode(const char *, umode_t,
struct proc_dir_entry *);
struct proc_dir_entry *proc_create_mount_point(const char *name);

-struct proc_dir_entry *proc_create_seq_data(const char *name, umode_t mode,
+struct proc_dir_entry *proc_create_seq_private(const char *name, umode_t mode,
struct proc_dir_entry *parent, const struct seq_operations *ops,
- void *data);
+ unsigned int state_size, void *data);
+#define proc_create_seq_data(name, mode, parent, ops, data) \
+ proc_create_seq_private(name, mode, parent, ops, 0, data)
#define proc_create_seq(name, mode, parent, ops) \
- proc_create_seq_data(name, mode, parent, ops, NULL)
+ proc_create_seq_private(name, mode, parent, ops, 0, NULL)

extern struct proc_dir_entry *proc_create_data(const char *, umode_t,
struct proc_dir_entry *,
@@ -64,6 +66,7 @@ static inline struct proc_dir_entry *proc_mkdir_data(const char *name,
umode_t mode, struct proc_dir_entry *parent, void *data) { return NULL; }
static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
umode_t mode, struct proc_dir_entry *parent) { return NULL; }
+#define proc_create_seq_private(name, mode, parent, ops, 0, data) ({NULL;})
#define proc_create_seq_data(name, mode, parent, ops, data) ({NULL;})
#define proc_create_seq(name, mode, parent, ops) ({NULL;})
#define proc_create(name, mode, parent, proc_fops) ({NULL;})
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index 0ed768b56c60..675c4e9563a9 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -372,24 +372,12 @@ static const struct seq_operations timer_list_sops = {
.show = timer_list_show,
};

-static int timer_list_open(struct inode *inode, struct file *filp)
-{
- return seq_open_private(filp, &timer_list_sops,
- sizeof(struct timer_list_iter));
-}
-
-static const struct file_operations timer_list_fops = {
- .open = timer_list_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_private,
-};
-
static int __init init_timer_list_procfs(void)
{
struct proc_dir_entry *pe;

- pe = proc_create("timer_list", 0400, NULL, &timer_list_fops);
+ pe = proc_create_seq_private("timer_list", 0400, NULL, &timer_list_sops,
+ sizeof(struct timer_list_iter), NULL);
if (!pe)
return -ENOMEM;
return 0;
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index bc43c7838778..63a5f502da08 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2751,24 +2751,12 @@ static const struct seq_operations vmalloc_op = {
.show = s_show,
};

-static int vmalloc_open(struct inode *inode, struct file *file)
-{
- return seq_open_private(file, &vmalloc_op,
- nr_node_ids * sizeof(unsigned int));
-}
-
-static const struct file_operations proc_vmalloc_operations = {
- .open = vmalloc_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_private,
-};
-
static int __init proc_vmalloc_init(void)
{
if (IS_ENABLED(CONFIG_NUMA))
- proc_create("vmallocinfo", S_IRUSR, NULL,
- &proc_vmalloc_operations);
+ proc_create_seq_private("vmallocinfo", S_IRUSR, NULL,
+ &vmalloc_op,
+ nr_node_ids * sizeof(unsigned int), NULL);
else
proc_create_seq("vmallocinfo", S_IRUSR, NULL, &vmalloc_op);
return 0;
diff --git a/net/appletalk/aarp.c b/net/appletalk/aarp.c
index d4c1021e74e1..49a16cee2aae 100644
--- a/net/appletalk/aarp.c
+++ b/net/appletalk/aarp.c
@@ -907,11 +907,6 @@ void aarp_device_down(struct net_device *dev)
}

#ifdef CONFIG_PROC_FS
-struct aarp_iter_state {
- int bucket;
- struct aarp_entry **table;
-};
-
/*
* Get the aarp entry that is in the chain described
* by the iterator.
@@ -1033,25 +1028,12 @@ static int aarp_seq_show(struct seq_file *seq, void *v)
return 0;
}

-static const struct seq_operations aarp_seq_ops = {
+const struct seq_operations aarp_seq_ops = {
.start = aarp_seq_start,
.next = aarp_seq_next,
.stop = aarp_seq_stop,
.show = aarp_seq_show,
};
-
-static int aarp_seq_open(struct inode *inode, struct file *file)
-{
- return seq_open_private(file, &aarp_seq_ops,
- sizeof(struct aarp_iter_state));
-}
-
-const struct file_operations atalk_seq_arp_fops = {
- .open = aarp_seq_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_private,
-};
#endif

/* General module cleanup. Called from cleanup_module() in ddp.c. */
diff --git a/net/appletalk/atalk_proc.c b/net/appletalk/atalk_proc.c
index d456c702e725..8006295f8bd7 100644
--- a/net/appletalk/atalk_proc.c
+++ b/net/appletalk/atalk_proc.c
@@ -236,7 +236,8 @@ int __init atalk_proc_init(void)
if (!p)
goto out_socket;

- p = proc_create("arp", 0444, atalk_proc_dir, &atalk_seq_arp_fops);
+ p = proc_create_seq_private("arp", 0444, atalk_proc_dir, &aarp_seq_ops,
+ sizeof(struct aarp_iter_state), NULL);
if (!p)
goto out_arp;

diff --git a/net/atm/lec.c b/net/atm/lec.c
index 3138a869b5c0..5a95fcf6f9b6 100644
--- a/net/atm/lec.c
+++ b/net/atm/lec.c
@@ -990,18 +990,6 @@ static const struct seq_operations lec_seq_ops = {
.stop = lec_seq_stop,
.show = lec_seq_show,
};
-
-static int lec_seq_open(struct inode *inode, struct file *file)
-{
- return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
-}
-
-static const struct file_operations lec_seq_fops = {
- .open = lec_seq_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_private,
-};
#endif

static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
@@ -1047,7 +1035,8 @@ static int __init lane_module_init(void)
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *p;

- p = proc_create("lec", 0444, atm_proc_root, &lec_seq_fops);
+ p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
+ sizeof(struct lec_state), NULL);
if (!p) {
pr_err("Unable to initialize /proc/net/atm/lec\n");
return -ENOMEM;
diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index 32751602767f..7d6ff983ba2c 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -2314,19 +2314,6 @@ static const struct seq_operations dn_socket_seq_ops = {
.stop = dn_socket_seq_stop,
.show = dn_socket_seq_show,
};
-
-static int dn_socket_seq_open(struct inode *inode, struct file *file)
-{
- return seq_open_private(file, &dn_socket_seq_ops,
- sizeof(struct dn_iter_state));
-}
-
-static const struct file_operations dn_socket_seq_fops = {
- .open = dn_socket_seq_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_private,
-};
#endif

static const struct net_proto_family dn_family_ops = {
@@ -2383,7 +2370,9 @@ static int __init decnet_init(void)
dev_add_pack(&dn_dix_packet_type);
register_netdevice_notifier(&dn_dev_notifier);

- proc_create("decnet", 0444, init_net.proc_net, &dn_socket_seq_fops);
+ proc_create_seq_private("decnet", 0444, init_net.proc_net,
+ &dn_socket_seq_ops, sizeof(struct dn_iter_state),
+ NULL);
dn_register_sysctl();
out:
return rc;
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index eca0cc6b761f..e74765024d88 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -1852,20 +1852,6 @@ static const struct seq_operations dn_rt_cache_seq_ops = {
.stop = dn_rt_cache_seq_stop,
.show = dn_rt_cache_seq_show,
};
-
-static int dn_rt_cache_seq_open(struct inode *inode, struct file *file)
-{
- return seq_open_private(file, &dn_rt_cache_seq_ops,
- sizeof(struct dn_rt_cache_iter_state));
-}
-
-static const struct file_operations dn_rt_cache_seq_fops = {
- .open = dn_rt_cache_seq_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_private,
-};
-
#endif /* CONFIG_PROC_FS */

void __init dn_route_init(void)
@@ -1918,8 +1904,9 @@ void __init dn_route_init(void)

dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);

- proc_create("decnet_cache", 0444, init_net.proc_net,
- &dn_rt_cache_seq_fops);
+ proc_create_seq_private("decnet_cache", 0444, init_net.proc_net,
+ &dn_rt_cache_seq_ops,
+ sizeof(struct dn_rt_cache_iter_state), NULL);

#ifdef CONFIG_DECNET_ROUTER
rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETROUTE,
--
2.17.0