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/* libguestfs - the guestfsd daemon
* Copyright (C) 2014 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* This file provides some interim APIs for virt-bmap. They will
* eventually be replaced by real APIs, see:
* https://www.redhat.com/archives/libguestfs/2014-November/msg00197.html
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <linux/fs.h>
#include "daemon.h"
#include "actions.h"
static int fd = -1;
static DIR *dir = NULL;
static struct stat statbuf;
static void bmap_finalize (void) __attribute__((destructor));
static void
bmap_finalize (void)
{
if (fd >= 0) {
close (fd);
fd = -1;
}
if (dir != NULL) {
closedir (dir);
dir = NULL;
}
}
static char *
bmap_prepare (const char *path, const char *orig_path)
{
char *ret;
bmap_finalize ();
if (stat (path, &statbuf) == -1) {
reply_with_perror ("%s", orig_path);
return NULL;
}
if (S_ISDIR (statbuf.st_mode)) {
/* Open a directory. */
dir = opendir (path);
if (dir == NULL) {
reply_with_perror ("opendir: %s", orig_path);
return NULL;
}
}
else {
/* Open a regular file. */
fd = open (path, O_RDONLY | O_CLOEXEC);
if (fd == -1) {
reply_with_perror ("%s", orig_path);
return NULL;
}
posix_fadvise (fd, 0, 0,
POSIX_FADV_SEQUENTIAL |
POSIX_FADV_NOREUSE |
POSIX_FADV_DONTNEED);
}
ret = strdup ("ok");
if (ret == NULL) {
reply_with_perror ("strdup");
return NULL;
}
return ret;
}
char *
debug_bmap_file (const char *subcmd, size_t argc, char *const *const argv)
{
CLEANUP_FREE char *buf = NULL;
const char *path;
if (argc != 1) {
reply_with_error ("bmap-file: missing path");
return NULL;
}
path = argv[0];
buf = sysroot_path (path);
if (!buf) {
reply_with_perror ("malloc");
return NULL;
}
return bmap_prepare (buf, path);
}
char *
debug_bmap_device (const char *subcmd, size_t argc, char *const *const argv)
{
const char *device;
if (argc != 1) {
reply_with_error ("bmap-device: missing device");
return NULL;
}
device = argv[0];
return bmap_prepare (device, device);
}
static char buffer[BUFSIZ];
char *
debug_bmap (const char *subcmd, size_t argc, char *const *const argv)
{
uint64_t n;
ssize_t r;
struct dirent *d;
char *ret;
if (argc != 0) {
reply_with_error ("bmap: extra parameters on command line");
return NULL;
}
/* Drop caches before starting the read. */
if (do_drop_caches (3) == -1)
return NULL;
if (fd >= 0) {
if (S_ISBLK (statbuf.st_mode)) {
/* Get size of block device. */
if (ioctl (fd, BLKGETSIZE64, &n) == -1) {
reply_with_perror ("ioctl: BLKGETSIZE64");
return NULL;
}
}
else
n = statbuf.st_size;
while (n > 0) {
r = read (fd, buffer, n > BUFSIZ ? BUFSIZ : n);
if (r == -1) {
reply_with_perror ("read");
close (fd);
fd = -1;
return NULL;
}
n -= r;
}
if (close (fd) == -1) {
reply_with_perror ("close");
fd = -1;
return NULL;
}
fd = -1;
}
if (dir != NULL) {
for (;;) {
errno = 0;
d = readdir (dir);
if (!d) break;
}
/* Check readdir didn't fail */
if (errno != 0) {
reply_with_perror ("readdir");
closedir (dir);
dir = NULL;
return NULL;
}
/* Close the directory handle */
if (closedir (dir) == -1) {
reply_with_perror ("closedir");
dir = NULL;
return NULL;
}
dir = NULL;
}
ret = strdup ("ok");
if (ret == NULL) {
reply_with_perror ("strdup");
return NULL;
}
return ret;
}
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