glusterfs

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/*
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  FUSE: Filesystem in Userspace
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  Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>
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  This program can be distributed under the terms of the GNU LGPLv2.
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  See the file COPYING.LIB.
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*/
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#include <dirent.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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int fuse_mnt_check_empty(const char *progname, const char *mnt,
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			 mode_t rootmode, off_t rootsize)
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{
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	int isempty = 1;
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	if (S_ISDIR(rootmode)) {
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		struct dirent *ent;
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		DIR *dp = opendir(mnt);
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		if (dp == NULL) {
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			fprintf(stderr,
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				"%s: failed to open mountpoint for reading: %s\n",
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				progname, strerror(errno));
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			return -1;
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		}
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		while ((ent = readdir(dp)) != NULL) {
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			if (strcmp(ent->d_name, ".") != 0 &&
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			    strcmp(ent->d_name, "..") != 0) {
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				isempty = 0;
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				break;
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			}
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		}
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		closedir(dp);
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	} else if (rootsize)
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		isempty = 0;
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	if (!isempty) {
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		fprintf(stderr, "%s: mountpoint is not empty\n", progname);
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		fprintf(stderr, "%s: if you are sure this is safe, use the 'nonempty' mount option\n", progname);
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		return -1;
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	}
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	return 0;
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}
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int fuse_mnt_check_fuseblk(void)
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{
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	char buf[256];
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	FILE *f = fopen("/proc/filesystems", "r");
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	if (!f)
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		return 1;
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	while (fgets(buf, sizeof(buf), f))
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		if (strstr(buf, "fuseblk\n")) {
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			fclose(f);
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			return 1;
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		}
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	fclose(f);
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	return 0;
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}
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