Message-Id: <1686766512-2589-5-git-send-email-ssengar@linux.microsoft.com>
Date:   Wed, 14 Jun 2023 11:15:11 -0700
From:   Saurabh Sengar <ssengar@...ux.microsoft.com>
To:     kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, mikelley@...rosoft.com,
        gregkh@...uxfoundation.org, corbet@....net,
        linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: [PATCH v2 4/5] tools: hv: Remove hv_fcopy_daemon

As the new fcopy application using uio is introduced, remove
obsolete hv_fcopy_daemon.c

Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
---
 tools/hv/hv_fcopy_daemon.c | 266 -------------------------------------
 1 file changed, 266 deletions(-)
 delete mode 100644 tools/hv/hv_fcopy_daemon.c

diff --git a/tools/hv/hv_fcopy_daemon.c b/tools/hv/hv_fcopy_daemon.c
deleted file mode 100644
index 16d629b22c25..000000000000
--- a/tools/hv/hv_fcopy_daemon.c
+++ /dev/null
@@ -1,266 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * An implementation of host to guest copy functionality for Linux.
- *
- * Copyright (C) 2014, Microsoft, Inc.
- *
- * Author : K. Y. Srinivasan <kys@...rosoft.com>
- */
-
-
-#include <sys/types.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <errno.h>
-#include <linux/hyperv.h>
-#include <linux/limits.h>
-#include <syslog.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <getopt.h>
-
-static int target_fd;
-static char target_fname[PATH_MAX];
-static unsigned long long filesize;
-
-static int hv_start_fcopy(struct hv_start_fcopy *smsg)
-{
-	int error = HV_E_FAIL;
-	char *q, *p;
-
-	filesize = 0;
-	p = (char *)smsg->path_name;
-	snprintf(target_fname, sizeof(target_fname), "%s/%s",
-		 (char *)smsg->path_name, (char *)smsg->file_name);
-
-	syslog(LOG_INFO, "Target file name: %s", target_fname);
-	/*
-	 * Check to see if the path is already in place; if not,
-	 * create if required.
-	 */
-	while ((q = strchr(p, '/')) != NULL) {
-		if (q == p) {
-			p++;
-			continue;
-		}
-		*q = '\0';
-		if (access((char *)smsg->path_name, F_OK)) {
-			if (smsg->copy_flags & CREATE_PATH) {
-				if (mkdir((char *)smsg->path_name, 0755)) {
-					syslog(LOG_ERR, "Failed to create %s",
-						(char *)smsg->path_name);
-					goto done;
-				}
-			} else {
-				syslog(LOG_ERR, "Invalid path: %s",
-					(char *)smsg->path_name);
-				goto done;
-			}
-		}
-		p = q + 1;
-		*q = '/';
-	}
-
-	if (!access(target_fname, F_OK)) {
-		syslog(LOG_INFO, "File: %s exists", target_fname);
-		if (!(smsg->copy_flags & OVER_WRITE)) {
-			error = HV_ERROR_ALREADY_EXISTS;
-			goto done;
-		}
-	}
-
-	target_fd = open(target_fname,
-			 O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0744);
-	if (target_fd == -1) {
-		syslog(LOG_INFO, "Open Failed: %s", strerror(errno));
-		goto done;
-	}
-
-	error = 0;
-done:
-	if (error)
-		target_fname[0] = '\0';
-	return error;
-}
-
-static int hv_copy_data(struct hv_do_fcopy *cpmsg)
-{
-	ssize_t bytes_written;
-	int ret = 0;
-
-	bytes_written = pwrite(target_fd, cpmsg->data, cpmsg->size,
-				cpmsg->offset);
-
-	filesize += cpmsg->size;
-	if (bytes_written != cpmsg->size) {
-		switch (errno) {
-		case ENOSPC:
-			ret = HV_ERROR_DISK_FULL;
-			break;
-		default:
-			ret = HV_E_FAIL;
-			break;
-		}
-		syslog(LOG_ERR, "pwrite failed to write %llu bytes: %ld (%s)",
-		       filesize, (long)bytes_written, strerror(errno));
-	}
-
-	return ret;
-}
-
-/*
- * Reset target_fname to "" in the two below functions for hibernation: if
- * the fcopy operation is aborted by hibernation, the daemon should remove the
- * partially-copied file; to achieve this, the hv_utils driver always fakes a
- * CANCEL_FCOPY message upon suspend, and later when the VM resumes back,
- * the daemon calls hv_copy_cancel() to remove the file; if a file is copied
- * successfully before suspend, hv_copy_finished() must reset target_fname to
- * avoid that the file can be incorrectly removed upon resume, since the faked
- * CANCEL_FCOPY message is spurious in this case.
- */
-static int hv_copy_finished(void)
-{
-	close(target_fd);
-	target_fname[0] = '\0';
-	return 0;
-}
-static int hv_copy_cancel(void)
-{
-	close(target_fd);
-	if (strlen(target_fname) > 0) {
-		unlink(target_fname);
-		target_fname[0] = '\0';
-	}
-	return 0;
-
-}
-
-void print_usage(char *argv[])
-{
-	fprintf(stderr, "Usage: %s [options]\n"
-		"Options are:\n"
-		"  -n, --no-daemon        stay in foreground, don't daemonize\n"
-		"  -h, --help             print this help\n", argv[0]);
-}
-
-int main(int argc, char *argv[])
-{
-	int fcopy_fd = -1;
-	int error;
-	int daemonize = 1, long_index = 0, opt;
-	int version = FCOPY_CURRENT_VERSION;
-	union {
-		struct hv_fcopy_hdr hdr;
-		struct hv_start_fcopy start;
-		struct hv_do_fcopy copy;
-		__u32 kernel_modver;
-	} buffer = { };
-	int in_handshake;
-
-	static struct option long_options[] = {
-		{"help",	no_argument,	   0,  'h' },
-		{"no-daemon",	no_argument,	   0,  'n' },
-		{0,		0,		   0,  0   }
-	};
-
-	while ((opt = getopt_long(argc, argv, "hn", long_options,
-				  &long_index)) != -1) {
-		switch (opt) {
-		case 'n':
-			daemonize = 0;
-			break;
-		case 'h':
-		default:
-			print_usage(argv);
-			exit(EXIT_FAILURE);
-		}
-	}
-
-	if (daemonize && daemon(1, 0)) {
-		syslog(LOG_ERR, "daemon() failed; error: %s", strerror(errno));
-		exit(EXIT_FAILURE);
-	}
-
-	openlog("HV_FCOPY", 0, LOG_USER);
-	syslog(LOG_INFO, "starting; pid is:%d", getpid());
-
-reopen_fcopy_fd:
-	if (fcopy_fd != -1)
-		close(fcopy_fd);
-	/* Remove any possible partially-copied file on error */
-	hv_copy_cancel();
-	in_handshake = 1;
-	fcopy_fd = open("/dev/vmbus/hv_fcopy", O_RDWR);
-
-	if (fcopy_fd < 0) {
-		syslog(LOG_ERR, "open /dev/vmbus/hv_fcopy failed; error: %d %s",
-			errno, strerror(errno));
-		exit(EXIT_FAILURE);
-	}
-
-	/*
-	 * Register with the kernel.
-	 */
-	if ((write(fcopy_fd, &version, sizeof(int))) != sizeof(int)) {
-		syslog(LOG_ERR, "Registration failed: %s", strerror(errno));
-		exit(EXIT_FAILURE);
-	}
-
-	while (1) {
-		/*
-		 * In this loop we process fcopy messages after the
-		 * handshake is complete.
-		 */
-		ssize_t len;
-
-		len = pread(fcopy_fd, &buffer, sizeof(buffer), 0);
-		if (len < 0) {
-			syslog(LOG_ERR, "pread failed: %s", strerror(errno));
-			goto reopen_fcopy_fd;
-		}
-
-		if (in_handshake) {
-			if (len != sizeof(buffer.kernel_modver)) {
-				syslog(LOG_ERR, "invalid version negotiation");
-				exit(EXIT_FAILURE);
-			}
-			in_handshake = 0;
-			syslog(LOG_INFO, "kernel module version: %u",
-			       buffer.kernel_modver);
-			continue;
-		}
-
-		switch (buffer.hdr.operation) {
-		case START_FILE_COPY:
-			error = hv_start_fcopy(&buffer.start);
-			break;
-		case WRITE_TO_FILE:
-			error = hv_copy_data(&buffer.copy);
-			break;
-		case COMPLETE_FCOPY:
-			error = hv_copy_finished();
-			break;
-		case CANCEL_FCOPY:
-			error = hv_copy_cancel();
-			break;
-
-		default:
-			error = HV_E_FAIL;
-			syslog(LOG_ERR, "Unknown operation: %d",
-				buffer.hdr.operation);
-
-		}
-
-		/*
-		 * pwrite() may return an error due to the faked CANCEL_FCOPY
-		 * message upon hibernation. Ignore the error by resetting the
-		 * dev file, i.e. closing and re-opening it.
-		 */
-		if (pwrite(fcopy_fd, &error, sizeof(int), 0) != sizeof(int)) {
-			syslog(LOG_ERR, "pwrite failed: %s", strerror(errno));
-			goto reopen_fcopy_fd;
-		}
-	}
-}
-- 
2.34.1

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