3  * fs/sharefs/file.c
14 static int sharefs_open(struct inode *inode, struct file *file)  in sharefs_open()  argument
17 	struct file *lower_file = NULL;  in sharefs_open()
21 	if (d_unhashed(file->f_path.dentry)) {  in sharefs_open()
26 	file->private_data =  in sharefs_open()
28 	if (!SHAREFS_F(file)) {  in sharefs_open()
33 	/* open lower object and link sharefs's file struct to lower's */  in sharefs_open()
34 	sharefs_get_lower_path(file->f_path.dentry, &lower_path);  in sharefs_open()
35 	lower_file = dentry_open(&lower_path, file->f_flags, current_cred());  in sharefs_open()
39 		lower_file = sharefs_lower_file(file);  in sharefs_open()
41 			sharefs_set_lower_file(file, NULL);  in sharefs_open()
45 		sharefs_set_lower_file(file, lower_file);  in sharefs_open()
49 		kfree(SHAREFS_F(file));  in sharefs_open()
63 static int sharefs_flush(struct file *file, fl_owner_t id)  in sharefs_flush()  argument
66 	struct file *lower_file = NULL;  in sharefs_flush()
68 	lower_file = sharefs_lower_file(file);  in sharefs_flush()
70 		filemap_write_and_wait(file->f_mapping);  in sharefs_flush()
77 /* release all lower object references & free the file info structure */
78 static int sharefs_file_release(struct inode *inode, struct file *file)  in sharefs_file_release()  argument
80 	struct file *lower_file;  in sharefs_file_release()
82 	lower_file = sharefs_lower_file(file);  in sharefs_file_release()
84 		sharefs_set_lower_file(file, NULL);  in sharefs_file_release()
88 	kfree(SHAREFS_F(file));  in sharefs_file_release()
92 static int sharefs_fsync(struct file *file, loff_t start, loff_t end,  in sharefs_fsync()  argument
96 	struct file *lower_file;  in sharefs_fsync()
98 	struct dentry *dentry = file->f_path.dentry;  in sharefs_fsync()
100 	err = __generic_file_fsync(file, start, end, datasync);  in sharefs_fsync()
103 	lower_file = sharefs_lower_file(file);  in sharefs_fsync()
111 static int sharefs_fasync(int fd, struct file *file, int flag)  in sharefs_fasync()  argument
114 	struct file *lower_file = NULL;  in sharefs_fasync()
116 	lower_file = sharefs_lower_file(file);  in sharefs_fasync()
125  * only set the offset of the upper file.  So we have to implement our
126  * own method to set both the upper and lower file offsets
129 static loff_t sharefs_file_llseek(struct file *file, loff_t offset, int whence)  in sharefs_file_llseek()  argument
132 	struct file *lower_file;  in sharefs_file_llseek()
134 	err = generic_file_llseek(file, offset, whence);  in sharefs_file_llseek()
138 	lower_file = sharefs_lower_file(file);  in sharefs_file_llseek()
152 	struct file *file = iocb->ki_filp, *lower_file;  in sharefs_read_iter()  local
154 	lower_file = sharefs_lower_file(file);  in sharefs_read_iter()
164 	iocb->ki_filp = file;  in sharefs_read_iter()
169 		fsstack_copy_attr_atime(d_inode(file->f_path.dentry),  in sharefs_read_iter()
182 	struct file *file = iocb->ki_filp, *lower_file;  in sharefs_write_iter()  local
184 	lower_file = sharefs_lower_file(file);  in sharefs_write_iter()
193 	iocb->ki_filp = file;  in sharefs_write_iter()
197 		fsstack_copy_inode_size(d_inode(file->f_path.dentry),  in sharefs_write_iter()
199 		fsstack_copy_attr_times(d_inode(file->f_path.dentry),  in sharefs_write_iter()