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src/cloner: check filesystem type

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Limit clone requests to Btrfs only for the moment.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
David Disseldorp
2014-06-18 09:32:25 +10:00
committed by Dave Chinner
parent 76d0cfb488
commit c79bb5c641
1 changed files with 47 additions and 0 deletions
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src/cloner.c
+47
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@@ -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 {