Support XFS
diff --git a/utils/fstype.c b/utils/fstype.c
index bbc236a..743e449 100644
--- a/utils/fstype.c
+++ b/utils/fstype.c
@@ -7,7 +7,7 @@
* FSSIZE - filesystem size (if known)
*
* We currently detect (in order):
- * gzip, cramfs, romfs, minix, ext3, ext2, reiserfs
+ * gzip, cramfs, romfs, xfs, minix, ext3, ext2, reiserfs
*
* MINIX, ext3 and Reiserfs bits are currently untested.
*/
@@ -24,6 +24,7 @@
#define _LINUX_EXT2_FS_SB
#include <linux/ext2_fs.h>
#include "ext3_fs.h"
+#include "xfs_sb.h"
/*
* reiserfs_fs.h is too sick to include directly.
@@ -160,6 +161,19 @@
return 0;
}
+static int xfs_image(const unsigned char *buf, unsigned long *blocks)
+{
+ const struct xfs_sb *sb =
+ (const struct xfs_sb *)buf;
+
+ if (__be32_to_cpu(sb->sb_magicnum) == XFS_SB_MAGIC) {
+ *blocks = __be64_to_cpu(sb->sb_dblocks) *
+ (__be32_to_cpu(sb->sb_blocksize) / BLOCK_SIZE);
+ return 1;
+ }
+ return 0;
+}
+
struct imagetype {
off_t block;
const char name[12];
@@ -170,6 +184,7 @@
{ 0, "gzip", gzip_image },
{ 0, "cramfs", cramfs_image },
{ 0, "romfs", romfs_image },
+ { 0, "xfs", xfs_image },
{ 1, "minix", minix_image },
{ 1, "ext3", ext3_image },
{ 1, "ext2", ext2_image },
diff --git a/utils/xfs_sb.h b/utils/xfs_sb.h
new file mode 100644
index 0000000..ffc79b1
--- /dev/null
+++ b/utils/xfs_sb.h
@@ -0,0 +1,17 @@
+/*
+ * Super block
+ * Fits into a sector-sized buffer at address 0 of each allocation group.
+ * Only the first of these is ever updated except during growfs.
+ */
+
+struct xfs_buf;
+struct xfs_mount;
+
+#define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */
+
+typedef struct xfs_sb
+{
+ __u32 sb_magicnum; /* magic number == XFS_SB_MAGIC */
+ __u32 sb_blocksize; /* logical block size, bytes */
+ __u64 sb_dblocks; /* number of data blocks */
+} xfs_sb_t;
