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편집 파일: cachefiles.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _LINUX_CACHEFILES_H #define _LINUX_CACHEFILES_H #include <linux/types.h> #include <linux/ioctl.h> /* * Fscache ensures that the maximum length of cookie key is 255. The volume key * is controlled by netfs, and generally no bigger than 255. */ #define CACHEFILES_MSG_MAX_SIZE 1024 enum cachefiles_opcode { CACHEFILES_OP_OPEN, CACHEFILES_OP_CLOSE, CACHEFILES_OP_READ, }; /* * Message Header * * @msg_id a unique ID identifying this message * @opcode message type, CACHEFILE_OP_* * @len message length, including message header and following data * @object_id a unique ID identifying a cache file * @data message type specific payload */ struct cachefiles_msg { __u32 msg_id; __u32 opcode; __u32 len; __u32 object_id; __u8 data[]; }; /* * @data contains the volume_key followed directly by the cookie_key. volume_key * is a NUL-terminated string; @volume_key_size indicates the size of the volume * key in bytes. cookie_key is binary data, which is netfs specific; * @cookie_key_size indicates the size of the cookie key in bytes. * * @fd identifies an anon_fd referring to the cache file. */ struct cachefiles_open { __u32 volume_key_size; __u32 cookie_key_size; __u32 fd; __u32 flags; __u8 data[]; }; /* * @off indicates the starting offset of the requested file range * @len indicates the length of the requested file range */ struct cachefiles_read { __u64 off; __u64 len; }; /* * Reply for READ request * @arg for this ioctl is the @id field of READ request. */ #define CACHEFILES_IOC_READ_COMPLETE _IOW(0x98, 1, int) #endif