11 #include <linux/file.h>
40 /* SLAB cache for file structures */
47 	struct file *f = container_of(head, struct file, f_u.fu_rcuhead);  in file_free_rcu()
53 static inline void file_free(struct file *f)  in file_free()
96 static struct file *__alloc_file(int flags, const struct cred *cred)  in __alloc_file()
98 	struct file *f;  in __alloc_file()
123 /* Find an unused file structure and return a pointer to it.
124  * Returns an error pointer if some error happend e.g. we over file
133 struct file *alloc_empty_file(int flags, const struct cred *cred)  in alloc_empty_file()
136 	struct file *f;  in alloc_empty_file()
159 		pr_info("VFS: file-max limit %lu reached\n", get_max_files());  in alloc_empty_file()
170 struct file *alloc_empty_file_noaccount(int flags, const struct cred *cred)  in alloc_empty_file_noaccount()
172 	struct file *f = __alloc_file(flags, cred);  in alloc_empty_file_noaccount()
181  * alloc_file - allocate and initialize a 'struct file'
183  * @path: the (dentry, vfsmount) pair for the new file
184  * @flags: O_... flags with which the new file will be opened
185  * @fop: the 'struct file_operations' for the new file
187 static struct file *alloc_file(const struct path *path, int flags,  in alloc_file()
190 	struct file *file;  in alloc_file()  local
192 	file = alloc_empty_file(flags, current_cred());  in alloc_file()
193 	if (IS_ERR(file))  in alloc_file()
194 		return file;  in alloc_file()
196 	file->f_path = *path;  in alloc_file()
197 	file->f_inode = path->dentry->d_inode;  in alloc_file()
198 	file->f_mapping = path->dentry->d_inode->i_mapping;  in alloc_file()
199 	file->f_wb_err = filemap_sample_wb_err(file->f_mapping);  in alloc_file()
200 	file->f_sb_err = file_sample_sb_err(file);  in alloc_file()
201 	if ((file->f_mode & FMODE_READ) &&  in alloc_file()
203 		file->f_mode |= FMODE_CAN_READ;  in alloc_file()
204 	if ((file->f_mode & FMODE_WRITE) &&  in alloc_file()
206 		file->f_mode |= FMODE_CAN_WRITE;  in alloc_file()
207 	file->f_mode |= FMODE_OPENED;  in alloc_file()
208 	file->f_op = fop;  in alloc_file()
209 	if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)  in alloc_file()
211 	return file;  in alloc_file()
214 struct file *alloc_file_pseudo(struct inode *inode, struct vfsmount *mnt,  in alloc_file_pseudo()
223 	struct file *file;  in alloc_file_pseudo()  local
232 	file = alloc_file(&path, flags, fops);  in alloc_file_pseudo()
233 	if (IS_ERR(file)) {  in alloc_file_pseudo()
237 	return file;  in alloc_file_pseudo()
241 struct file *alloc_file_clone(struct file *base, int flags,  in alloc_file_clone()
244 	struct file *f = alloc_file(&base->f_path, flags, fops);  in alloc_file_clone()
252 /* the real guts of fput() - releasing the last reference to file
254 static void __fput(struct file *file)  in __fput()  argument
256 	struct dentry *dentry = file->f_path.dentry;  in __fput()
257 	struct vfsmount *mnt = file->f_path.mnt;  in __fput()
258 	struct inode *inode = file->f_inode;  in __fput()
259 	fmode_t mode = file->f_mode;  in __fput()
261 	if (unlikely(!(file->f_mode & FMODE_OPENED)))  in __fput()
266 	fsnotify_close(file);  in __fput()
269 	 * in the file cleanup chain.  in __fput()
271 	eventpoll_release(file);  in __fput()
272 	locks_remove_file(file);  in __fput()
274 	ima_file_free(file);  in __fput()
275 	if (unlikely(file->f_flags & FASYNC)) {  in __fput()
276 		if (file->f_op->fasync)  in __fput()
277 			file->f_op->fasync(-1, file, 0);  in __fput()
279 	if (file->f_op->release)  in __fput()
280 		file->f_op->release(inode, file);  in __fput()
285 	fops_put(file->f_op);  in __fput()
286 	put_pid(file->f_owner.pid);  in __fput()
298 	file_free(file);  in __fput()
305 	struct file *f, *t;  in delayed_fput()
313 	__fput(container_of(work, struct file, f_u.fu_rcuhead));  in ____fput()
320  * not left us with opened struct file waiting for __fput() - execve()
334 void fput_many(struct file *file, unsigned int refs)  in fput_many()  argument
336 	if (atomic_long_sub_and_test(refs, &file->f_count)) {  in fput_many()
340 			init_task_work(&file->f_u.fu_rcuhead, ____fput);  in fput_many()
341 			if (!task_work_add(task, &file->f_u.fu_rcuhead, TWA_RESUME))  in fput_many()
346 			 * fput to avoid leaking *file.  in fput_many()
350 		if (llist_add(&file->f_u.fu_llist, &delayed_fput_list))  in fput_many()
355 void fput(struct file *file)  in fput()  argument
357 	fput_many(file, 1);  in fput()
364  * for this specific struct file it won't involve anything that would
368 void __fput_sync(struct file *file)  in __fput_sync()  argument
370 	if (atomic_long_dec_and_test(&file->f_count)) {  in __fput_sync()
373 		__fput(file);  in __fput_sync()
381 	filp_cachep = kmem_cache_create("filp", sizeof(struct file), 0,  in files_init()
387  * One file with associated inode and dcache is very roughly 1K. Per default