Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * An implementation of host to guest copy functionality for Linux.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2014, Microsoft, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Author : K. Y. Srinivasan <kys@microsoft.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/hyperv.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/limits.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <syslog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <getopt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) static int target_fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static char target_fname[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) static unsigned long long filesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) static int hv_start_fcopy(struct hv_start_fcopy *smsg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	int error = HV_E_FAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	char *q, *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	filesize = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	p = (char *)smsg->path_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	snprintf(target_fname, sizeof(target_fname), "%s/%s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		 (char *)smsg->path_name, (char *)smsg->file_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	syslog(LOG_INFO, "Target file name: %s", target_fname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	 * Check to see if the path is already in place; if not,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	 * create if required.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	while ((q = strchr(p, '/')) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		if (q == p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 			p++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		*q = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		if (access((char *)smsg->path_name, F_OK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 			if (smsg->copy_flags & CREATE_PATH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 				if (mkdir((char *)smsg->path_name, 0755)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 					syslog(LOG_ERR, "Failed to create %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 						(char *)smsg->path_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 					goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 			} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 				syslog(LOG_ERR, "Invalid path: %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 					(char *)smsg->path_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 				goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		p = q + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		*q = '/';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	if (!access(target_fname, F_OK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		syslog(LOG_INFO, "File: %s exists", target_fname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		if (!(smsg->copy_flags & OVER_WRITE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 			error = HV_ERROR_ALREADY_EXISTS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 			goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	target_fd = open(target_fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 			 O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0744);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	if (target_fd == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		syslog(LOG_INFO, "Open Failed: %s", strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		target_fname[0] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) static int hv_copy_data(struct hv_do_fcopy *cpmsg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	ssize_t bytes_written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	bytes_written = pwrite(target_fd, cpmsg->data, cpmsg->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 				cpmsg->offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	filesize += cpmsg->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	if (bytes_written != cpmsg->size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		switch (errno) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		case ENOSPC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			ret = HV_ERROR_DISK_FULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 			ret = HV_E_FAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		syslog(LOG_ERR, "pwrite failed to write %llu bytes: %ld (%s)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		       filesize, (long)bytes_written, strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)  * Reset target_fname to "" in the two below functions for hibernation: if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)  * the fcopy operation is aborted by hibernation, the daemon should remove the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)  * partially-copied file; to achieve this, the hv_utils driver always fakes a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)  * CANCEL_FCOPY message upon suspend, and later when the VM resumes back,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)  * the daemon calls hv_copy_cancel() to remove the file; if a file is copied
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)  * successfully before suspend, hv_copy_finished() must reset target_fname to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)  * avoid that the file can be incorrectly removed upon resume, since the faked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)  * CANCEL_FCOPY message is spurious in this case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static int hv_copy_finished(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	close(target_fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	target_fname[0] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static int hv_copy_cancel(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	close(target_fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	if (strlen(target_fname) > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		unlink(target_fname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		target_fname[0] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) void print_usage(char *argv[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	fprintf(stderr, "Usage: %s [options]\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		"Options are:\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		"  -n, --no-daemon        stay in foreground, don't daemonize\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		"  -h, --help             print this help\n", argv[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) int main(int argc, char *argv[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	int fcopy_fd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	int daemonize = 1, long_index = 0, opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	int version = FCOPY_CURRENT_VERSION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		struct hv_fcopy_hdr hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		struct hv_start_fcopy start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		struct hv_do_fcopy copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		__u32 kernel_modver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	} buffer = { };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	int in_handshake;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	static struct option long_options[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		{"help",	no_argument,	   0,  'h' },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		{"no-daemon",	no_argument,	   0,  'n' },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		{0,		0,		   0,  0   }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	while ((opt = getopt_long(argc, argv, "hn", long_options,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 				  &long_index)) != -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		switch (opt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		case 'n':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			daemonize = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		case 'h':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			print_usage(argv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 			exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	if (daemonize && daemon(1, 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		syslog(LOG_ERR, "daemon() failed; error: %s", strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	openlog("HV_FCOPY", 0, LOG_USER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	syslog(LOG_INFO, "starting; pid is:%d", getpid());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) reopen_fcopy_fd:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (fcopy_fd != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		close(fcopy_fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	/* Remove any possible partially-copied file on error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	hv_copy_cancel();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	in_handshake = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	fcopy_fd = open("/dev/vmbus/hv_fcopy", O_RDWR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (fcopy_fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		syslog(LOG_ERR, "open /dev/vmbus/hv_fcopy failed; error: %d %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 			errno, strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	 * Register with the kernel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if ((write(fcopy_fd, &version, sizeof(int))) != sizeof(int)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		syslog(LOG_ERR, "Registration failed: %s", strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		 * In this loop we process fcopy messages after the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		 * handshake is complete.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		ssize_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		len = pread(fcopy_fd, &buffer, sizeof(buffer), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		if (len < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 			syslog(LOG_ERR, "pread failed: %s", strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 			goto reopen_fcopy_fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		if (in_handshake) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			if (len != sizeof(buffer.kernel_modver)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 				syslog(LOG_ERR, "invalid version negotiation");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 				exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 			in_handshake = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 			syslog(LOG_INFO, "kernel module version: %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 			       buffer.kernel_modver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		switch (buffer.hdr.operation) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		case START_FILE_COPY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			error = hv_start_fcopy(&buffer.start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		case WRITE_TO_FILE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			error = hv_copy_data(&buffer.copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		case COMPLETE_FCOPY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 			error = hv_copy_finished();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		case CANCEL_FCOPY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 			error = hv_copy_cancel();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 			error = HV_E_FAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 			syslog(LOG_ERR, "Unknown operation: %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 				buffer.hdr.operation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		 * pwrite() may return an error due to the faked CANCEL_FCOPY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		 * message upon hibernation. Ignore the error by resetting the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		 * dev file, i.e. closing and re-opening it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		if (pwrite(fcopy_fd, &error, sizeof(int), 0) != sizeof(int)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			syslog(LOG_ERR, "pwrite failed: %s", strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			goto reopen_fcopy_fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }