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/*
* Copyright (c) 2008, XenSource Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of XenSource Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/resource.h>
#include <sys/utsname.h>
#ifdef __linux__
#include <linux/version.h>
#endif
#include "blk.h"
#include "tapdisk.h"
#include "blktaplib.h"
#include "tapdisk-log.h"
#include "tapdisk-utils.h"
void
tapdisk_start_logging(const char *name)
{
static char buf[128];
snprintf(buf, sizeof(buf), "%s[%d]", name, getpid());
openlog(buf, LOG_CONS | LOG_ODELAY, LOG_DAEMON);
open_tlog("/tmp/tapdisk.log", (64 << 10), TLOG_WARN, 0);
}
void
tapdisk_stop_logging(void)
{
closelog();
close_tlog();
}
int
tapdisk_set_resource_limits(void)
{
int err;
struct rlimit rlim;
rlim.rlim_cur = RLIM_INFINITY;
rlim.rlim_max = RLIM_INFINITY;
err = setrlimit(RLIMIT_MEMLOCK, &rlim);
if (err == -1) {
EPRINTF("RLIMIT_MEMLOCK failed: %d\n", errno);
return -errno;
}
err = mlockall(MCL_CURRENT | MCL_FUTURE);
if (err == -1) {
EPRINTF("mlockall failed: %d\n", errno);
return -errno;
}
#define CORE_DUMP
#if defined(CORE_DUMP)
err = setrlimit(RLIMIT_CORE, &rlim);
if (err == -1)
EPRINTF("RLIMIT_CORE failed: %d\n", errno);
#endif
return 0;
}
int
tapdisk_namedup(char **dup, const char *name)
{
*dup = NULL;
if (strnlen(name, MAX_NAME_LEN) >= MAX_NAME_LEN)
return -ENAMETOOLONG;
*dup = strdup(name);
if (!*dup)
return -ENOMEM;
return 0;
}
/*Get Image size, secsize*/
int
tapdisk_get_image_size(int fd, uint64_t *_sectors, uint32_t *_sector_size)
{
int ret;
struct stat stat;
uint64_t sectors;
uint64_t sector_size;
sectors = 0;
sector_size = 0;
*_sectors = 0;
*_sector_size = 0;
if (fstat(fd, &stat)) {
DPRINTF("ERROR: fstat failed, Couldn't stat image");
return -EINVAL;
}
if (S_ISBLK(stat.st_mode)) {
/*Accessing block device directly*/
if (blk_getimagesize(fd, §ors) != 0)
return -EINVAL;
/*Get the sector size*/
if (blk_getsectorsize(fd, §or_size) != 0)
sector_size = DEFAULT_SECTOR_SIZE;
} else {
/*Local file? try fstat instead*/
sectors = (stat.st_size >> SECTOR_SHIFT);
sector_size = DEFAULT_SECTOR_SIZE;
}
if (sectors == 0) {
sectors = 16836057ULL;
sector_size = DEFAULT_SECTOR_SIZE;
}
return 0;
}
#ifdef __linux__
int tapdisk_linux_version(void)
{
struct utsname uts;
unsigned int version, patchlevel, sublevel;
int n, err;
err = uname(&uts);
if (err)
return -errno;
n = sscanf(uts.release, "%u.%u.%u", &version, &patchlevel, &sublevel);
if (n != 3)
return -ENOSYS;
return KERNEL_VERSION(version, patchlevel, sublevel);
}
#else
int tapdisk_linux_version(void)
{
return -ENOSYS;
}
#endif
int read_exact(int fd, void *data, size_t size)
{
size_t offset = 0;
ssize_t len;
while ( offset < size )
{
len = read(fd, (char *)data + offset, size - offset);
if ( (len == -1) && (errno == EINTR) )
continue;
if ( len == 0 )
errno = 0;
if ( len <= 0 )
return -1;
offset += len;
}
return 0;
}
int write_exact(int fd, const void *data, size_t size)
{
size_t offset = 0;
ssize_t len;
while ( offset < size )
{
len = write(fd, (const char *)data + offset, size - offset);
if ( (len == -1) && (errno == EINTR) )
continue;
if ( len <= 0 )
return -1;
offset += len;
}
return 0;
}
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