print_usage();
file = av[optind++];
+ ret = check_mounted(file);
+ if (ret < 0) {
+ fprintf(stderr, "error checking %s mount status\n", file);
+ exit(1);
+ }
+ if (ret == 1) {
+ fprintf(stderr, "%s is mounted\n", file);
+ exit(1);
+ }
ac--;
fd = open(file, O_RDWR);
if (fd < 0) {
zero_end = 1;
while(ac-- > 0) {
file = av[optind++];
+ ret = check_mounted(file);
+ if (ret < 0) {
+ fprintf(stderr, "error checking %s mount status\n",
+ file);
+ exit(1);
+ }
+ if (ret == 1) {
+ fprintf(stderr, "%s is mounted\n", file);
+ exit(1);
+ }
fd = open(file, O_RDWR);
if (fd < 0) {
fprintf(stderr, "unable to open %s\n", file);
#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
+#include <mntent.h>
#include "kerncompat.h"
#include "radix-tree.h"
#include "ctree.h"
return ret;
}
+/*
+ * returns 1 if the device was mounted, < 0 on error or 0 if everything
+ * is safe to continue. TODO, this should also scan multi-device filesystems
+ */
+int check_mounted(char *file)
+{
+ struct mntent *mnt;
+ struct stat st_buf;
+ dev_t file_dev = 0;
+ dev_t file_rdev = 0;
+ ino_t file_ino = 0;
+ FILE *f;
+ int ret = 0;
+
+ if ((f = setmntent ("/proc/mounts", "r")) == NULL)
+ return -errno;
+
+ if (stat(file, &st_buf) < 0) {
+ return -errno;
+ } else {
+ if (S_ISBLK(st_buf.st_mode)) {
+ file_rdev = st_buf.st_rdev;
+ } else {
+ file_dev = st_buf.st_dev;
+ file_ino = st_buf.st_ino;
+ }
+ }
+
+ while ((mnt = getmntent (f)) != NULL) {
+ if (strcmp(file, mnt->mnt_fsname) == 0)
+ break;
+
+ if (stat(mnt->mnt_fsname, &st_buf) == 0) {
+ if (S_ISBLK(st_buf.st_mode)) {
+ if (file_rdev && (file_rdev == st_buf.st_rdev))
+ break;
+ } else if (file_dev && ((file_dev == st_buf.st_dev) &&
+ (file_ino == st_buf.st_ino))) {
+ break;
+ }
+ }
+ }
+
+ if (mnt) {
+ /* found an entry in mnt table */
+ ret = 1;
+ }
+
+ endmntent (f);
+ return ret;
+}
+
struct pending_dir {
struct list_head list;
char name[256];
int run_ioctls);
int btrfs_register_one_device(char *fname);
int btrfs_scan_one_dir(char *dirname, int run_ioctl);
+int check_mounted(char *devicename);
#endif