btrfs-progs/common/utils-lib.c
David Sterba c3ee6a8a09 btrfs-progs: unify GPL header comments
Add the GPL v2 header to files where it was missing and is not from an
external source, update to the most recent version with the address.

Signed-off-by: David Sterba <dsterba@suse.com>
2021-09-07 13:58:44 +02:00

88 lines
2.2 KiB
C

/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include "kerncompat.h"
#include "common/utils.h"
#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/ioctl.h>
#include <ioctl.h>
#if BTRFS_FLAT_INCLUDES
#include "kernel-shared/ctree.h"
#else
#include <btrfs/ctree.h>
#endif /* BTRFS_FLAT_INCLUDES */
/*
* This function should be only used when parsing command arg, it won't return
* error to its caller and rather exit directly just like usage().
*/
u64 arg_strtou64(const char *str)
{
u64 value;
char *ptr_parse_end = NULL;
value = strtoull(str, &ptr_parse_end, 0);
if (ptr_parse_end && *ptr_parse_end != '\0') {
fprintf(stderr, "ERROR: %s is not a valid numeric value.\n",
str);
exit(1);
}
/*
* if we pass a negative number to strtoull, it will return an
* unexpected number to us, so let's do the check ourselves.
*/
if (str[0] == '-') {
fprintf(stderr, "ERROR: %s: negative value is invalid.\n",
str);
exit(1);
}
if (value == ULLONG_MAX) {
fprintf(stderr, "ERROR: %s is too large.\n", str);
exit(1);
}
return value;
}
/*
* For a given:
* - file or directory return the containing tree root id
* - subvolume return its own tree id
* - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
* undefined and function returns -1
*/
int lookup_path_rootid(int fd, u64 *rootid)
{
struct btrfs_ioctl_ino_lookup_args args;
int ret;
memset(&args, 0, sizeof(args));
args.treeid = 0;
args.objectid = BTRFS_FIRST_FREE_OBJECTID;
ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
if (ret < 0)
return -errno;
*rootid = args.treeid;
return 0;
}