11 #include <linux/file.h>
41 /* SLAB cache for file structures */
48 	struct file *f = container_of(head, struct file, f_rcuhead);  in file_free_rcu()
54 static inline void file_free(struct file *f)  in file_free()
93 		.procname	= "file-nr",
100 		.procname	= "file-max",
133 static struct file *__alloc_file(int flags, const struct cred *cred)  in __alloc_file()
135 	struct file *f;  in __alloc_file()
160 /* Find an unused file structure and return a pointer to it.
161  * Returns an error pointer if some error happend e.g. we over file
170 struct file *alloc_empty_file(int flags, const struct cred *cred)  in alloc_empty_file()
173 	struct file *f;  in alloc_empty_file()
196 		pr_info("VFS: file-max limit %lu reached\n", get_max_files());  in alloc_empty_file()
207 struct file *alloc_empty_file_noaccount(int flags, const struct cred *cred)  in alloc_empty_file_noaccount()
209 	struct file *f = __alloc_file(flags, cred);  in alloc_empty_file_noaccount()
218  * alloc_file - allocate and initialize a 'struct file'
220  * @path: the (dentry, vfsmount) pair for the new file
221  * @flags: O_... flags with which the new file will be opened
222  * @fop: the 'struct file_operations' for the new file
224 static struct file *alloc_file(const struct path *path, int flags,  in alloc_file()
227 	struct file *file;  in alloc_file()  local
229 	file = alloc_empty_file(flags, current_cred());  in alloc_file()
230 	if (IS_ERR(file))  in alloc_file()
231 		return file;  in alloc_file()
233 	file->f_path = *path;  in alloc_file()
234 	file->f_inode = path->dentry->d_inode;  in alloc_file()
235 	file->f_mapping = path->dentry->d_inode->i_mapping;  in alloc_file()
236 	file->f_wb_err = filemap_sample_wb_err(file->f_mapping);  in alloc_file()
237 	file->f_sb_err = file_sample_sb_err(file);  in alloc_file()
239 		file->f_mode |= FMODE_LSEEK;  in alloc_file()
240 	if ((file->f_mode & FMODE_READ) &&  in alloc_file()
242 		file->f_mode |= FMODE_CAN_READ;  in alloc_file()
243 	if ((file->f_mode & FMODE_WRITE) &&  in alloc_file()
245 		file->f_mode |= FMODE_CAN_WRITE;  in alloc_file()
246 	file->f_iocb_flags = iocb_flags(file);  in alloc_file()
247 	file->f_mode |= FMODE_OPENED;  in alloc_file()
248 	file->f_op = fop;  in alloc_file()
249 	if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)  in alloc_file()
251 	return file;  in alloc_file()
254 struct file *alloc_file_pseudo(struct inode *inode, struct vfsmount *mnt,  in alloc_file_pseudo()
263 	struct file *file;  in alloc_file_pseudo()  local
272 	file = alloc_file(&path, flags, fops);  in alloc_file_pseudo()
273 	if (IS_ERR(file)) {  in alloc_file_pseudo()
277 	return file;  in alloc_file_pseudo()
281 struct file *alloc_file_clone(struct file *base, int flags,  in alloc_file_clone()
284 	struct file *f = alloc_file(&base->f_path, flags, fops);  in alloc_file_clone()
292 /* the real guts of fput() - releasing the last reference to file
294 static void __fput(struct file *file)  in __fput()  argument
296 	struct dentry *dentry = file->f_path.dentry;  in __fput()
297 	struct vfsmount *mnt = file->f_path.mnt;  in __fput()
298 	struct inode *inode = file->f_inode;  in __fput()
299 	fmode_t mode = file->f_mode;  in __fput()
301 	if (unlikely(!(file->f_mode & FMODE_OPENED)))  in __fput()
306 	fsnotify_close(file);  in __fput()
309 	 * in the file cleanup chain.  in __fput()
311 	eventpoll_release(file);  in __fput()
312 	locks_remove_file(file);  in __fput()
314 	ima_file_free(file);  in __fput()
315 	if (unlikely(file->f_flags & FASYNC)) {  in __fput()
316 		if (file->f_op->fasync)  in __fput()
317 			file->f_op->fasync(-1, file, 0);  in __fput()
319 	if (file->f_op->release)  in __fput()
320 		file->f_op->release(inode, file);  in __fput()
325 	fops_put(file->f_op);  in __fput()
326 	put_pid(file->f_owner.pid);  in __fput()
327 	put_file_access(file);  in __fput()
333 	file_free(file);  in __fput()
340 	struct file *f, *t;  in delayed_fput()
348 	__fput(container_of(work, struct file, f_rcuhead));  in ____fput()
355  * not left us with opened struct file waiting for __fput() - execve()
369 void fput(struct file *file)  in fput()  argument
371 	if (atomic_long_dec_and_test(&file->f_count)) {  in fput()
375 			init_task_work(&file->f_rcuhead, ____fput);  in fput()
376 			if (!task_work_add(task, &file->f_rcuhead, TWA_RESUME))  in fput()
381 			 * fput to avoid leaking *file.  in fput()
385 		if (llist_add(&file->f_llist, &delayed_fput_list))  in fput()
394  * for this specific struct file it won't involve anything that would
398 void __fput_sync(struct file *file)  in __fput_sync()  argument
400 	if (atomic_long_dec_and_test(&file->f_count)) {  in __fput_sync()
403 		__fput(file);  in __fput_sync()
412 	filp_cachep = kmem_cache_create("filp", sizeof(struct file), 0,  in files_init()
418  * One file with associated inode and dcache is very roughly 1K. Per default