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/*
* Copyright (C) 2010 Canonical
*
* 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.
*
*/
/*
* Author Colin Ian King, colin.king@canonical.com
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#if defined(__linux__)
#include <linux/fs.h>
#endif
#include "include/inttypes.h"
#include "include/fiemap.h"
struct fiemap *read_fiemap(int fd)
{
struct fiemap *fiemap;
int extents_size;
int r;
if ((fiemap = (struct fiemap*)malloc(sizeof(struct fiemap))) == NULL) {
fprintf(stderr, "Out of memory allocating fiemap\n");
return NULL;
}
memset(fiemap, 0, sizeof(struct fiemap));
fiemap->fm_start = 0;
fiemap->fm_length = ~0; /* Lazy */
fiemap->fm_flags = 0;
fiemap->fm_extent_count = 0;
fiemap->fm_mapped_extents = 0;
/* Find out how many extents there are */
r = ioctl(fd, FS_IOC_FIEMAP, fiemap);
if (r < 0) {
goto done_err;
}
if (!fiemap->fm_mapped_extents) {
free(fiemap);
return NULL;
}
/* Read in the extents */
extents_size = sizeof(struct fiemap_extent) * (fiemap->fm_mapped_extents);
/* Resize fiemap to allow us to read in the extents */
if ((fiemap = (struct fiemap*)realloc(fiemap,sizeof(struct fiemap) +
extents_size)) == NULL) {
fprintf(stderr, "Out of memory allocating fiemap\n");
goto done_err;
}
memset(fiemap->fm_extents, 0, extents_size);
fiemap->fm_extent_count = fiemap->fm_mapped_extents;
fiemap->fm_mapped_extents = 0;
if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0) {
fprintf(stderr, "fiemap ioctl() failed\n");
goto done_err;
}
return fiemap;
done_err:
free(fiemap);
return NULL;
}
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