Limit clone requests to Btrfs only for the moment.
Signed-off-by: David Disseldorp <dd...@suse.de>
---
src/cloner.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/src/cloner.c b/src/cloner.c
index ccc2354..6fb40fa 100644
--- a/src/cloner.c
+++ b/src/cloner.c
@@ -22,6 +22,7 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
+#include <sys/vfs.h>
#include <stdint.h>
#include <stdbool.h>
#include <fcntl.h>
@@ -30,6 +31,7 @@
#include <stdio.h>
#include <string.h>
#include <errno.h>
+#include <linux/magic.h>
#ifdef HAVE_BTRFS_IOCTL_H
#include <btrfs/ioctl.h>
#else
@@ -47,6 +49,10 @@ struct btrfs_ioctl_clone_range_args {
struct btrfs_ioctl_clone_range_args)
#endif
+#ifndef BTRFS_SUPER_MAGIC
+#define BTRFS_SUPER_MAGIC 0x9123683E
+#endif
+
static void
usage(char *name, const char *msg)
{
@@ -89,6 +95,41 @@ clone_file_range(int src_fd, int dst_fd, uint64_t src_off,
uint64_t dst_off,
return ret;
}
+static int
+cloner_check_fs_support(int src_fd, int dest_fd, unsigned int *fs_type)
+{
+ int ret;
+ struct statfs sfs;
+
+ ret = fstatfs(src_fd, &sfs);
+ if (ret != 0) {
+ printf("failed to stat source FS\n");
+ return errno;
+ }
+
+ if (sfs.f_type != BTRFS_SUPER_MAGIC) {
+ printf("unsupported source FS 0x%x\n",
+ (unsigned int)sfs.f_type);
+ return ENOTSUP;
+ }
+
+ *fs_type = (unsigned int)sfs.f_type;
+
+ ret = fstatfs(dest_fd, &sfs);
+ if (ret != 0) {
+ printf("failed to stat destination FS\n");
+ return errno;
+ }
+
+ if (sfs.f_type != *fs_type) {
+ printf("dest FS type 0x%x does not match source 0x%x\n",
+ (unsigned int)sfs.f_type, *fs_type);
+ return ENOTSUP;
+ }
+
+ return 0;
+}
+
int
main(int argc, char **argv)
{
@@ -102,6 +143,7 @@ main(int argc, char **argv)
int dst_fd;
int ret;
int opt;
+ unsigned int fs_type = 0;
while ((opt = getopt(argc, argv, "s:d:l:")) != -1) {
char *sval_end;
@@ -162,6 +204,11 @@ main(int argc, char **argv)
goto err_src_close;
}
+ ret = cloner_check_fs_support(src_fd, dst_fd, &fs_type);
+ if (ret != 0) {
+ goto err_dst_close;
+ }
+
if (full_file) {
ret = clone_file(src_fd, dst_fd);
} else {
--
1.8.4.5
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