/* 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
/* * 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
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