name : kernel_read_file.h /* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_KERNEL_READ_FILE_H #define _LINUX_KERNEL_READ_FILE_H #include <linux/file.h> #include <linux/types.h> /* This is a list of *what* is being read, not *how* nor *where*. */ #define __kernel_read_file_id(id) \ id(UNKNOWN, unknown) \ id(FIRMWARE, firmware) \ id(MODULE, kernel-module) \ id(KEXEC_IMAGE, kexec-image) \ id(KEXEC_INITRAMFS, kexec-initramfs) \ id(POLICY, security-policy) \ id(X509_CERTIFICATE, x509-certificate) \ id(MAX_ID, ) #define __fid_enumify(ENUM, dummy) READING_ ## ENUM, #define __fid_stringify(dummy, str) #str, enum kernel_read_file_id { __kernel_read_file_id(__fid_enumify) }; static const char * const kernel_read_file_str[] = { __kernel_read_file_id(__fid_stringify) }; static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id) { if ((unsigned int)id >= READING_MAX_ID) return kernel_read_file_str[READING_UNKNOWN]; return kernel_read_file_str[id]; } ssize_t kernel_read_file(struct file *file, loff_t offset, void **buf, size_t buf_size, size_t *file_size, enum kernel_read_file_id id); ssize_t kernel_read_file_from_path(const char *path, loff_t offset, void **buf, size_t buf_size, size_t *file_size, enum kernel_read_file_id id); ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset, void **buf, size_t buf_size, size_t *file_size, enum kernel_read_file_id id); ssize_t kernel_read_file_from_fd(int fd, loff_t offset, void **buf, size_t buf_size, size_t *file_size, enum kernel_read_file_id id); #endif /* _LINUX_KERNEL_READ_FILE_H */