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proc: decouple proc from VFS with "struct proc_ops"

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Currently core /proc code uses "struct file_operations" for custom hooks,
however, VFS doesn't directly call them.  Every time VFS expands
file_operations hook set, /proc code bloats for no reason.

Introduce "struct proc_ops" which contains only those hooks which /proc
allows to call into (open, release, read, write, ioctl, mmap, poll).  It
doesn't contain module pointer as well.

Save ~184 bytes per usage:

	add/remove: 26/26 grow/shrink: 1/4 up/down: 1922/-6674 (-4752)
	Function                                     old     new   delta
	sysvipc_proc_ops                               -      72     +72
				...
	config_gz_proc_ops                             -      72     +72
	proc_get_inode                               289     339     +50
	proc_reg_get_unmapped_area                   110     107      -3
	close_pdeo                                   227     224      -3
	proc_reg_open                                289     284      -5
	proc_create_data                              60      53      -7
	rt_cpu_seq_fops                              256       -    -256
				...
	default_affinity_proc_fops                   256       -    -256
	Total: Before=5430095, After=5425343, chg -0.09%

Link: http://lkml.kernel.org/r/20191225172228.GA13378@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2020-02-03 17:37:14 -08:00 • committed by Linus Torvalds
parent 0d6e24d430
commit d56c0d45f0
7 changed files with 98 additions and 80 deletions
Download patch file Download diff file Expand all files Collapse all files

32
fs/proc/proc_net.c
View file

@ -90,12 +90,12 @@ static int seq_release_net(struct inode *ino, struct file *f)
return 0;
}
static const struct file_operations proc_net_seq_fops = {
.open = seq_open_net,
.read = seq_read,
.write = proc_simple_write,
.llseek = seq_lseek,
.release = seq_release_net,
static const struct proc_ops proc_net_seq_ops = {
.proc_open = seq_open_net,
.proc_read = seq_read,
.proc_write = proc_simple_write,
.proc_lseek = seq_lseek,
.proc_release = seq_release_net,
};
struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
@ -108,7 +108,7 @@ struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
if (!p)
return NULL;
pde_force_lookup(p);
p->proc_fops = &proc_net_seq_fops;
p->proc_ops = &proc_net_seq_ops;
p->seq_ops = ops;
p->state_size = state_size;
return proc_register(parent, p);
@ -152,7 +152,7 @@ struct proc_dir_entry *proc_create_net_data_write(const char *name, umode_t mode
if (!p)
return NULL;
pde_force_lookup(p);
p->proc_fops = &proc_net_seq_fops;
p->proc_ops = &proc_net_seq_ops;
p->seq_ops = ops;
p->state_size = state_size;
p->write = write;
@ -183,12 +183,12 @@ static int single_release_net(struct inode *ino, struct file *f)
return single_release(ino, f);
}
static const struct file_operations proc_net_single_fops = {
.open = single_open_net,
.read = seq_read,
.write = proc_simple_write,
.llseek = seq_lseek,
.release = single_release_net,
static const struct proc_ops proc_net_single_ops = {
.proc_open = single_open_net,
.proc_read = seq_read,
.proc_write = proc_simple_write,
.proc_lseek = seq_lseek,
.proc_release = single_release_net,
};
struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
@ -201,7 +201,7 @@ struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
if (!p)
return NULL;
pde_force_lookup(p);
p->proc_fops = &proc_net_single_fops;
p->proc_ops = &proc_net_single_ops;
p->single_show = show;
return proc_register(parent, p);
}
@ -244,7 +244,7 @@ struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mo
if (!p)
return NULL;
pde_force_lookup(p);
p->proc_fops = &proc_net_single_fops;
p->proc_ops = &proc_net_single_ops;
p->single_show = show;
p->write = write;
return proc_register(parent, p);