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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

76
fs/proc/inode.c
View file

@ -163,7 +163,7 @@ static void close_pdeo(struct proc_dir_entry *pde, struct pde_opener *pdeo)
pdeo->closing = true;
spin_unlock(&pde->pde_unload_lock);
file = pdeo->file;
pde->proc_fops->release(file_inode(file), file);
pde->proc_ops->proc_release(file_inode(file), file);
spin_lock(&pde->pde_unload_lock);
/* After ->release. */
list_del(&pdeo->lh);
@ -200,12 +200,12 @@ static loff_t proc_reg_llseek(struct file *file, loff_t offset, int whence)
struct proc_dir_entry *pde = PDE(file_inode(file));
loff_t rv = -EINVAL;
if (use_pde(pde)) {
typeof_member(struct file_operations, llseek) llseek;
typeof_member(struct proc_ops, proc_lseek) lseek;
llseek = pde->proc_fops->llseek;
if (!llseek)
llseek = default_llseek;
rv = llseek(file, offset, whence);
lseek = pde->proc_ops->proc_lseek;
if (!lseek)
lseek = default_llseek;
rv = lseek(file, offset, whence);
unuse_pde(pde);
}
return rv;
@ -216,9 +216,9 @@ static ssize_t proc_reg_read(struct file *file, char __user *buf, size_t count,
struct proc_dir_entry *pde = PDE(file_inode(file));
ssize_t rv = -EIO;
if (use_pde(pde)) {
typeof_member(struct file_operations, read) read;
typeof_member(struct proc_ops, proc_read) read;
read = pde->proc_fops->read;
read = pde->proc_ops->proc_read;
if (read)
rv = read(file, buf, count, ppos);
unuse_pde(pde);
@ -231,9 +231,9 @@ static ssize_t proc_reg_write(struct file *file, const char __user *buf, size_t
struct proc_dir_entry *pde = PDE(file_inode(file));
ssize_t rv = -EIO;
if (use_pde(pde)) {
typeof_member(struct file_operations, write) write;
typeof_member(struct proc_ops, proc_write) write;
write = pde->proc_fops->write;
write = pde->proc_ops->proc_write;
if (write)
rv = write(file, buf, count, ppos);
unuse_pde(pde);
@ -246,9 +246,9 @@ static __poll_t proc_reg_poll(struct file *file, struct poll_table_struct *pts)
struct proc_dir_entry *pde = PDE(file_inode(file));
__poll_t rv = DEFAULT_POLLMASK;
if (use_pde(pde)) {
typeof_member(struct file_operations, poll) poll;
typeof_member(struct proc_ops, proc_poll) poll;
poll = pde->proc_fops->poll;
poll = pde->proc_ops->proc_poll;
if (poll)
rv = poll(file, pts);
unuse_pde(pde);
@ -261,9 +261,9 @@ static long proc_reg_unlocked_ioctl(struct file *file, unsigned int cmd, unsigne
struct proc_dir_entry *pde = PDE(file_inode(file));
long rv = -ENOTTY;
if (use_pde(pde)) {
typeof_member(struct file_operations, unlocked_ioctl) ioctl;
typeof_member(struct proc_ops, proc_ioctl) ioctl;
ioctl = pde->proc_fops->unlocked_ioctl;
ioctl = pde->proc_ops->proc_ioctl;
if (ioctl)
rv = ioctl(file, cmd, arg);
unuse_pde(pde);
@ -277,9 +277,9 @@ static long proc_reg_compat_ioctl(struct file *file, unsigned int cmd, unsigned
struct proc_dir_entry *pde = PDE(file_inode(file));
long rv = -ENOTTY;
if (use_pde(pde)) {
typeof_member(struct file_operations, compat_ioctl) compat_ioctl;
typeof_member(struct proc_ops, proc_compat_ioctl) compat_ioctl;
compat_ioctl = pde->proc_fops->compat_ioctl;
compat_ioctl = pde->proc_ops->proc_compat_ioctl;
if (compat_ioctl)
rv = compat_ioctl(file, cmd, arg);
unuse_pde(pde);
@ -293,9 +293,9 @@ static int proc_reg_mmap(struct file *file, struct vm_area_struct *vma)
struct proc_dir_entry *pde = PDE(file_inode(file));
int rv = -EIO;
if (use_pde(pde)) {
typeof_member(struct file_operations, mmap) mmap;
typeof_member(struct proc_ops, proc_mmap) mmap;
mmap = pde->proc_fops->mmap;
mmap = pde->proc_ops->proc_mmap;
if (mmap)
rv = mmap(file, vma);
unuse_pde(pde);
@ -312,9 +312,9 @@ proc_reg_get_unmapped_area(struct file *file, unsigned long orig_addr,
unsigned long rv = -EIO;
if (use_pde(pde)) {
typeof_member(struct file_operations, get_unmapped_area) get_area;
typeof_member(struct proc_ops, proc_get_unmapped_area) get_area;
get_area = pde->proc_fops->get_unmapped_area;
get_area = pde->proc_ops->proc_get_unmapped_area;
#ifdef CONFIG_MMU
if (!get_area)
get_area = current->mm->get_unmapped_area;
@ -333,8 +333,8 @@ static int proc_reg_open(struct inode *inode, struct file *file)
{
struct proc_dir_entry *pde = PDE(inode);
int rv = 0;
typeof_member(struct file_operations, open) open;
typeof_member(struct file_operations, release) release;
typeof_member(struct proc_ops, proc_open) open;
typeof_member(struct proc_ops, proc_release) release;
struct pde_opener *pdeo;
/*
@ -351,7 +351,7 @@ static int proc_reg_open(struct inode *inode, struct file *file)
if (!use_pde(pde))
return -ENOENT;
release = pde->proc_fops->release;
release = pde->proc_ops->proc_release;
if (release) {
pdeo = kmem_cache_alloc(pde_opener_cache, GFP_KERNEL);
if (!pdeo) {
@ -360,7 +360,7 @@ static int proc_reg_open(struct inode *inode, struct file *file)
}
}
open = pde->proc_fops->open;
open = pde->proc_ops->proc_open;
if (open)
rv = open(inode, file);
@ -468,21 +468,23 @@ struct inode *proc_get_inode(struct super_block *sb, struct proc_dir_entry *de)
inode->i_size = de->size;
if (de->nlink)
set_nlink(inode, de->nlink);
WARN_ON(!de->proc_iops);
inode->i_op = de->proc_iops;
if (de->proc_fops) {
if (S_ISREG(inode->i_mode)) {
if (S_ISREG(inode->i_mode)) {
inode->i_op = de->proc_iops;
inode->i_fop = &proc_reg_file_ops;
#ifdef CONFIG_COMPAT
if (!de->proc_fops->compat_ioctl)
inode->i_fop =
&proc_reg_file_ops_no_compat;
else
#endif
inode->i_fop = &proc_reg_file_ops;
} else {
inode->i_fop = de->proc_fops;
if (!de->proc_ops->proc_compat_ioctl) {
inode->i_fop = &proc_reg_file_ops_no_compat;
}
}
#endif
} else if (S_ISDIR(inode->i_mode)) {
inode->i_op = de->proc_iops;
inode->i_fop = de->proc_dir_ops;
} else if (S_ISLNK(inode->i_mode)) {
inode->i_op = de->proc_iops;
inode->i_fop = NULL;
} else
BUG();
} else
pde_put(de);
return inode;