9  * kernel_read_file() - read file contents into a kernel buffer
11  * @file:	file to read from
18  * @file_size:	if non-NULL, the full size of @file will be
21  *		file contents being read (for LSMs to examine)
24  * (i.e. the caller must be expecting to read partial file contents
26  * will be able to determine when the entire file was read by
28  * file, though, since it is possible that the contents might
35 ssize_t kernel_read_file(struct file *file, loff_t offset, void **buf,  in kernel_read_file()  argument
48 	if (!S_ISREG(file_inode(file)->i_mode))  in kernel_read_file()
51 	ret = deny_write_access(file);  in kernel_read_file()
55 	i_size = i_size_read(file_inode(file));  in kernel_read_file()
60 	/* The file is too big for sane activities. */  in kernel_read_file()
65 	/* The entire file cannot be read in one buffer. */  in kernel_read_file()
72 	ret = security_kernel_read_file(file, id, whole_file);  in kernel_read_file()
93 		bytes = kernel_read(file, *buf + copied, wanted, &pos);  in kernel_read_file()
110 		ret = security_kernel_post_read_file(file, *buf, i_size, id);  in kernel_read_file()
122 	allow_write_access(file);  in kernel_read_file()
131 	struct file *file;  in kernel_read_file_from_path()  local
137 	file = filp_open(path, O_RDONLY, 0);  in kernel_read_file_from_path()
138 	if (IS_ERR(file))  in kernel_read_file_from_path()
139 		return PTR_ERR(file);  in kernel_read_file_from_path()
141 	ret = kernel_read_file(file, offset, buf, buf_size, file_size, id);  in kernel_read_file_from_path()
142 	fput(file);  in kernel_read_file_from_path()
152 	struct file *file;  in kernel_read_file_from_path_initns()  local
163 	file = file_open_root(&root, path, O_RDONLY, 0);  in kernel_read_file_from_path_initns()
165 	if (IS_ERR(file))  in kernel_read_file_from_path_initns()
166 		return PTR_ERR(file);  in kernel_read_file_from_path_initns()
168 	ret = kernel_read_file(file, offset, buf, buf_size, file_size, id);  in kernel_read_file_from_path_initns()
169 	fput(file);  in kernel_read_file_from_path_initns()