---
mount/main.c | 55 +++++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 48 insertions(+), 7 deletions(-)
diff --git a/mount/main.c b/mount/main.c
index b3b2e0fc33e0..693dba2dc78d 100644
--- a/mount/main.c
+++ b/mount/main.c
@@ -51,6 +51,7 @@ enum erofs_backend_drv {
enum erofsmount_mode {
EROFSMOUNT_MODE_MOUNT,
EROFSMOUNT_MODE_UMOUNT,
+ EROFSMOUNT_MODE_DISCONNECT,
EROFSMOUNT_MODE_REATTACH,
};
@@ -88,13 +89,14 @@ static void usage(int argc, char **argv)
"Manage EROFS filesystem.\n"
"\n"
"General options:\n"
- " -V, --version print the version number of mount.erofs and
exit\n"
- " -h, --help display this help and exit\n"
- " -o options comma-separated list of mount options\n"
- " -t type[.subtype] filesystem type (and optional subtype)\n"
- " subtypes: fuse, local, nbd\n"
- " -u unmount the filesystem\n"
- " --reattach reattach to an existing NBD device\n"
+ " -V, --version print the version number of mount.erofs and
exit\n"
+ " -h, --help display this help and exit\n"
+ " -o options comma-separated list of mount options\n"
+ " -t type[.subtype] filesystem type (and optional subtype)\n"
+ " subtypes: fuse, local, nbd\n"
+ " -u unmount the filesystem\n"
+ " --disconnect abort an existing NBD device forcibly\n"
+ " --reattach reattach to an existing NBD device\n"
#ifdef OCIEROFS_ENABLED
"\n"
"OCI-specific options (with -o):\n"
@@ -271,6 +273,7 @@ static int erofsmount_parse_options(int argc, char **argv)
{"help", no_argument, 0, 'h'},
{"version", no_argument, 0, 'V'},
{"reattach", no_argument, 0, 512},
+ {"disconnect", no_argument, 0, 513},
{0, 0, 0, 0},
};
char *dot;
@@ -316,6 +319,9 @@ static int erofsmount_parse_options(int argc, char **argv)
case 512:
mountcfg.mountmode = EROFSMOUNT_MODE_REATTACH;
break;
+ case 513:
+ mountcfg.mountmode = EROFSMOUNT_MODE_DISCONNECT;
+ break;
default:
return -EINVAL;
}
@@ -1415,6 +1421,33 @@ err_out:
return err < 0 ? err : 0;
}
+static int erofsmount_disconnect(const char *target)
+{
+ int nbdnum, err, fd;
+ struct stat st;
+
+ err = lstat(target, &st);
+ if (err < 0)
+ return -errno;
+
+ if (!S_ISBLK(st.st_mode) || major(st.st_rdev) != EROFS_NBD_MAJOR)
+ return -ENOTBLK;
+
+ nbdnum = erofs_nbd_get_index_from_minor(minor(st.st_rdev));
+ err = erofs_nbd_nl_disconnect(nbdnum);
+ if (err == -EOPNOTSUPP) {
+ fd = open(target, O_RDWR);
+ if (fd < 0) {
+ err = -errno;
+ goto err_out;
+ }
+ err = erofs_nbd_disconnect(fd);
+ close(fd);
+ }
+err_out:
+ return err < 0 ? err : 0;
+}
+
int main(int argc, char *argv[])
{
int err;
@@ -1443,6 +1476,14 @@ int main(int argc, char *argv[])
return err ? EXIT_FAILURE : EXIT_SUCCESS;
}
+ if (mountcfg.mountmode == EROFSMOUNT_MODE_DISCONNECT) {
+ err = erofsmount_disconnect(mountcfg.target);
+ if (err < 0)
+ fprintf(stderr, "Failed to disconnect %s: %s\n",
+ mountcfg.target, erofs_strerror(err));
+ return err ? EXIT_FAILURE : EXIT_SUCCESS;
+ }
+
if (mountcfg.backend == EROFSFUSE) {
err = erofsmount_fuse(mountcfg.device, mountcfg.target,
mountcfg.fstype, mountcfg.full_options);
