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-rw-r--r--extlinux/main.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/extlinux/main.c b/extlinux/main.c
index bbcc8db3..d1a800cd 100644
--- a/extlinux/main.c
+++ b/extlinux/main.c
@@ -14,7 +14,8 @@
/*
* extlinux.c
*
- * Install the syslinux boot block on an fat, ntfs, ext2/3/4 and btrfs filesystem
+ * Install the syslinux boot block on an fat, ntfs, ext2/3/4, btrfs and xfs
+ * filesystem.
*/
#define _GNU_SOURCE /* Enable everything */
@@ -49,6 +50,7 @@
#include "xfs.h"
#include "xfs_types.h"
#include "xfs_sb.h"
+#include "misc.h"
#include "../version.h"
#include "syslxint.h"
#include "syslxcom.h" /* common functions shared with extlinux and syslinux */
@@ -71,7 +73,8 @@
* we will use the first 0~512 bytes starting from 2048 for the Syslinux
* boot sector.
*/
-#define XFS_BOOTSECT_OFFSET 4 * SECTOR_SIZE
+#define XFS_BOOTSECT_OFFSET (4 << SECTOR_SHIFT)
+#define XFS_SUPPORTED_BLOCKSIZE 4096 /* 4 KiB filesystem block size */
/* the btrfs partition first 64K blank area is used to store boot sector and
boot image, the boot sector is from 0~512, the boot image starts after */
@@ -379,8 +382,19 @@ int install_bootblock(int fd, const char *device)
return 1;
}
- if (sb5.sb_magicnum == *(u32 *)XFS_SB_MAGIC)
+ if (sb5.sb_magicnum == *(u32 *)XFS_SB_MAGIC) {
+ if (be32_to_cpu(sb5.sb_blocksize) != XFS_SUPPORTED_BLOCKSIZE) {
+ fprintf(stderr,
+ "You need to have 4 KiB filesystem block size for "
+ " being able to install Syslinux in your XFS "
+ "partition (because there is no enough space in MBR to "
+ "determine where Syslinux bootsector can be installed "
+ "regardless the filesystem block size)\n");
+ return 1;
+ }
+
ok = true;
+ }
}
if (!ok) {