fs/proc/inode.c

63 	ei->pde = NULL;
78 	if (ei->pde)
79 		pde_put(ei->pde);
198 static inline int use_pde(struct proc_dir_entry *pde)
200 	return likely(atomic_inc_unless_negative(&pde->in_use));
203 static void unuse_pde(struct proc_dir_entry *pde)
205 	if (unlikely(atomic_dec_return(&pde->in_use) == BIAS))
206 		complete(pde->pde_unload_completion);
218 static void close_pdeo(struct proc_dir_entry *pde, struct pde_opener *pdeo)
219 	__releases(&pde->pde_unload_lock)
232 		spin_unlock(&pde->pde_unload_lock);
239 		spin_unlock(&pde->pde_unload_lock);
242 		pde->proc_ops->proc_release(file_inode(file), file);
244 		spin_lock(&pde->pde_unload_lock);
248 		spin_unlock(&pde->pde_unload_lock);
277 	struct proc_dir_entry *pde = PDE(file_inode(file));
280 	if (pde_is_permanent(pde)) {
281 		return pde->proc_ops->proc_lseek(file, offset, whence);
282 	} else if (use_pde(pde)) {
283 		rv = pde->proc_ops->proc_lseek(file, offset, whence);
284 		unuse_pde(pde);
291 	struct proc_dir_entry *pde = PDE(file_inode(iocb->ki_filp));
294 	if (pde_is_permanent(pde))
295 		return pde->proc_ops->proc_read_iter(iocb, iter);
297 	if (!use_pde(pde))
299 	ret = pde->proc_ops->proc_read_iter(iocb, iter);
300 	unuse_pde(pde);
304 static ssize_t pde_read(struct proc_dir_entry *pde, struct file *file, char __user *buf, size_t count, loff_t *ppos)
308 	read = pde->proc_ops->proc_read;
316 	struct proc_dir_entry *pde = PDE(file_inode(file));
319 	if (pde_is_permanent(pde)) {
320 		return pde_read(pde, file, buf, count, ppos);
321 	} else if (use_pde(pde)) {
322 		rv = pde_read(pde, file, buf, count, ppos);
323 		unuse_pde(pde);
328 static ssize_t pde_write(struct proc_dir_entry *pde, struct file *file, const char __user *buf, size_t count, loff_t *ppos)
332 	write = pde->proc_ops->proc_write;
340 	struct proc_dir_entry *pde = PDE(file_inode(file));
343 	if (pde_is_permanent(pde)) {
344 		return pde_write(pde, file, buf, count, ppos);
345 	} else if (use_pde(pde)) {
346 		rv = pde_write(pde, file, buf, count, ppos);
347 		unuse_pde(pde);
352 static __poll_t pde_poll(struct proc_dir_entry *pde, struct file *file, struct poll_table_struct *pts)
356 	poll = pde->proc_ops->proc_poll;
364 	struct proc_dir_entry *pde = PDE(file_inode(file));
367 	if (pde_is_permanent(pde)) {
368 		return pde_poll(pde, file, pts);
369 	} else if (use_pde(pde)) {
370 		rv = pde_poll(pde, file, pts);
371 		unuse_pde(pde);
376 static long pde_ioctl(struct proc_dir_entry *pde, struct file *file, unsigned int cmd, unsigned long arg)
380 	ioctl = pde->proc_ops->proc_ioctl;
388 	struct proc_dir_entry *pde = PDE(file_inode(file));
391 	if (pde_is_permanent(pde)) {
392 		return pde_ioctl(pde, file, cmd, arg);
393 	} else if (use_pde(pde)) {
394 		rv = pde_ioctl(pde, file, cmd, arg);
395 		unuse_pde(pde);
401 static long pde_compat_ioctl(struct proc_dir_entry *pde, struct file *file, unsigned int cmd, unsigned long arg)
405 	compat_ioctl = pde->proc_ops->proc_compat_ioctl;
413 	struct proc_dir_entry *pde = PDE(file_inode(file));
415 	if (pde_is_permanent(pde)) {
416 		return pde_compat_ioctl(pde, file, cmd, arg);
417 	} else if (use_pde(pde)) {
418 		rv = pde_compat_ioctl(pde, file, cmd, arg);
419 		unuse_pde(pde);
425 static int pde_mmap(struct proc_dir_entry *pde, struct file *file, struct vm_area_struct *vma)
429 	mmap = pde->proc_ops->proc_mmap;
437 	struct proc_dir_entry *pde = PDE(file_inode(file));
440 	if (pde_is_permanent(pde)) {
441 		return pde_mmap(pde, file, vma);
442 	} else if (use_pde(pde)) {
443 		rv = pde_mmap(pde, file, vma);
444 		unuse_pde(pde);
450 pde_get_unmapped_area(struct proc_dir_entry *pde, struct file *file, unsigned long orig_addr,
456 	get_area = pde->proc_ops->proc_get_unmapped_area;
471 	struct proc_dir_entry *pde = PDE(file_inode(file));
474 	if (pde_is_permanent(pde)) {
475 		return pde_get_unmapped_area(pde, file, orig_addr, len, pgoff, flags);
476 	} else if (use_pde(pde)) {
477 		rv = pde_get_unmapped_area(pde, file, orig_addr, len, pgoff, flags);
478 		unuse_pde(pde);
485 	struct proc_dir_entry *pde = PDE(inode);
491 	if (!pde->proc_ops->proc_lseek)
494 	if (pde_is_permanent(pde)) {
495 		open = pde->proc_ops->proc_open;
512 	if (!use_pde(pde))
515 	release = pde->proc_ops->proc_release;
524 	open = pde->proc_ops->proc_open;
534 			spin_lock(&pde->pde_unload_lock);
535 			list_add(&pdeo->lh, &pde->pde_openers);
536 			spin_unlock(&pde->pde_unload_lock);
542 	unuse_pde(pde);
548 	struct proc_dir_entry *pde = PDE(inode);
551 	if (pde_is_permanent(pde)) {
554 		release = pde->proc_ops->proc_release;
561 	spin_lock(&pde->pde_unload_lock);
562 	list_for_each_entry(pdeo, &pde->pde_openers, lh) {
564 			close_pdeo(pde, pdeo);
568 	spin_unlock(&pde->pde_unload_lock);
635 	struct proc_dir_entry *pde = PDE(inode);
636 	if (!use_pde(pde))
638 	set_delayed_call(done, proc_put_link, pde);
639 	return pde->data;
658 	PROC_I(inode)->pde = de;