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