From 28ea4298e380d73203890c0f42de68e9798396d8 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Sun, 15 Feb 2009 05:51:19 +0000
Subject: [PATCH] volume_id: abort early on read failures.  should help with
 probing missing fdd's

---
 util-linux/volume_id/cramfs.c             |  3 +-
 util-linux/volume_id/ext.c                |  3 +-
 util-linux/volume_id/fat.c                |  3 +-
 util-linux/volume_id/get_devname.c        |  2 +-
 util-linux/volume_id/hfs.c                |  3 +-
 util-linux/volume_id/iso9660.c            |  3 +-
 util-linux/volume_id/jfs.c                |  3 +-
 util-linux/volume_id/linux_raid.c         |  3 +-
 util-linux/volume_id/linux_swap.c         |  3 +-
 util-linux/volume_id/luks.c               |  3 +-
 util-linux/volume_id/ntfs.c               |  3 +-
 util-linux/volume_id/ocfs2.c              |  3 +-
 util-linux/volume_id/reiserfs.c           |  3 +-
 util-linux/volume_id/romfs.c              |  3 +-
 util-linux/volume_id/sysv.c               |  3 +-
 util-linux/volume_id/udf.c                |  3 +-
 util-linux/volume_id/util.c               | 12 +++--
 util-linux/volume_id/volume_id.c          | 42 ++++++++-------
 util-linux/volume_id/volume_id_internal.h | 65 ++++++++++++-----------
 util-linux/volume_id/xfs.c                |  3 +-
 20 files changed, 99 insertions(+), 70 deletions(-)

diff --git a/util-linux/volume_id/cramfs.c b/util-linux/volume_id/cramfs.c
index 63b0c7cad..dd939e494 100644
--- a/util-linux/volume_id/cramfs.c
+++ b/util-linux/volume_id/cramfs.c
@@ -35,8 +35,9 @@ struct cramfs_super {
 	uint8_t		name[16];
 } __attribute__((__packed__));
 
-int volume_id_probe_cramfs(struct volume_id *id, uint64_t off)
+int volume_id_probe_cramfs(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	struct cramfs_super *cs;
 
 	dbg("probing at offset 0x%llx", (unsigned long long) off);
diff --git a/util-linux/volume_id/ext.c b/util-linux/volume_id/ext.c
index db29dae70..b052e04ce 100644
--- a/util-linux/volume_id/ext.c
+++ b/util-linux/volume_id/ext.c
@@ -43,8 +43,9 @@ struct ext2_super_block {
 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV	0x00000008
 #define EXT_SUPERBLOCK_OFFSET			0x400
 
-int volume_id_probe_ext(struct volume_id *id, uint64_t off)
+int volume_id_probe_ext(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	struct ext2_super_block *es;
 
 	dbg("ext: probing at offset 0x%llx", (unsigned long long) off);
diff --git a/util-linux/volume_id/fat.c b/util-linux/volume_id/fat.c
index 0e0a57d62..352040f57 100644
--- a/util-linux/volume_id/fat.c
+++ b/util-linux/volume_id/fat.c
@@ -119,8 +119,9 @@ static uint8_t *get_attr_volume_id(struct vfat_dir_entry *dir, int count)
 	return NULL;
 }
 
-int volume_id_probe_vfat(struct volume_id *id, uint64_t fat_partition_off)
+int volume_id_probe_vfat(struct volume_id *id /*,uint64_t fat_partition_off*/)
 {
+#define fat_partition_off ((uint64_t)0)
 	struct vfat_super_block *vs;
 	struct vfat_dir_entry *dir;
 	uint16_t sector_size_bytes;
diff --git a/util-linux/volume_id/get_devname.c b/util-linux/volume_id/get_devname.c
index d82808fa2..45a4aeea9 100644
--- a/util-linux/volume_id/get_devname.c
+++ b/util-linux/volume_id/get_devname.c
@@ -37,7 +37,7 @@ get_label_uuid(int fd, char **label, char **uuid)
 	if (ioctl(/*vid->*/fd, BLKGETSIZE64, &size) != 0)
 		size = 0;
 
-	if (volume_id_probe_all(vid, 0, size) != 0)
+	if (volume_id_probe_all(vid, /*0,*/ size) != 0)
 		goto ret;
 
 	if (vid->label[0] != '\0' || vid->uuid[0] != '\0') {
diff --git a/util-linux/volume_id/hfs.c b/util-linux/volume_id/hfs.c
index 79658e4fa..f99b895c4 100644
--- a/util-linux/volume_id/hfs.c
+++ b/util-linux/volume_id/hfs.c
@@ -131,8 +131,9 @@ struct hfsplus_vol_header {
 #define HFS_NODE_LEAF			0xff
 #define HFSPLUS_POR_CNID		1
 
-int volume_id_probe_hfs_hfsplus(struct volume_id *id, uint64_t off)
+int volume_id_probe_hfs_hfsplus(struct volume_id *id /*,uint64_t off*/)
 {
+	uint64_t off = 0;
 	unsigned blocksize;
 	unsigned cat_block;
 	unsigned ext_block_start;
diff --git a/util-linux/volume_id/iso9660.c b/util-linux/volume_id/iso9660.c
index c15608ce0..82f5e4846 100644
--- a/util-linux/volume_id/iso9660.c
+++ b/util-linux/volume_id/iso9660.c
@@ -47,8 +47,9 @@ struct high_sierra_volume_descriptor {
 	uint8_t		version;
 } __attribute__((__packed__));
 
-int volume_id_probe_iso9660(struct volume_id *id, uint64_t off)
+int volume_id_probe_iso9660(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	uint8_t *buf;
 	struct iso_volume_descriptor *is;
 	struct high_sierra_volume_descriptor *hs;
diff --git a/util-linux/volume_id/jfs.c b/util-linux/volume_id/jfs.c
index 63692f946..4c39e537a 100644
--- a/util-linux/volume_id/jfs.c
+++ b/util-linux/volume_id/jfs.c
@@ -35,8 +35,9 @@ struct jfs_super_block {
 
 #define JFS_SUPERBLOCK_OFFSET			0x8000
 
-int volume_id_probe_jfs(struct volume_id *id, uint64_t off)
+int volume_id_probe_jfs(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	struct jfs_super_block *js;
 
 	dbg("probing at offset 0x%llx", (unsigned long long) off);
diff --git a/util-linux/volume_id/linux_raid.c b/util-linux/volume_id/linux_raid.c
index 0877b8ad2..cc024692c 100644
--- a/util-linux/volume_id/linux_raid.c
+++ b/util-linux/volume_id/linux_raid.c
@@ -42,8 +42,9 @@ struct mdp_super_block {
 #define MD_RESERVED_BYTES		0x10000
 #define MD_MAGIC			0xa92b4efc
 
-int volume_id_probe_linux_raid(struct volume_id *id, uint64_t off, uint64_t size)
+int volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size)
 {
+#define off ((uint64_t)0)
 	uint64_t sboff;
 	uint8_t uuid[16];
 	struct mdp_super_block *mdp;
diff --git a/util-linux/volume_id/linux_swap.c b/util-linux/volume_id/linux_swap.c
index e6084542f..c9b62e9bf 100644
--- a/util-linux/volume_id/linux_swap.c
+++ b/util-linux/volume_id/linux_swap.c
@@ -31,8 +31,9 @@ struct swap_header_v1_2 {
 
 #define LARGEST_PAGESIZE			0x4000
 
-int volume_id_probe_linux_swap(struct volume_id *id, uint64_t off)
+int volume_id_probe_linux_swap(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	struct swap_header_v1_2 *sw;
 	const uint8_t *buf;
 	unsigned page;
diff --git a/util-linux/volume_id/luks.c b/util-linux/volume_id/luks.c
index b0f0f5b21..ebc7d160d 100644
--- a/util-linux/volume_id/luks.c
+++ b/util-linux/volume_id/luks.c
@@ -80,8 +80,9 @@ struct BUG_bad_size_luks_phdr {
 		1 : -1];
 };
 
-int volume_id_probe_luks(struct volume_id *id, uint64_t off)
+int volume_id_probe_luks(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	struct luks_phdr *header;
 
 	header = volume_id_get_buffer(id, off, sizeof(*header));
diff --git a/util-linux/volume_id/ntfs.c b/util-linux/volume_id/ntfs.c
index 7488a41a3..6e8f1dd3d 100644
--- a/util-linux/volume_id/ntfs.c
+++ b/util-linux/volume_id/ntfs.c
@@ -84,8 +84,9 @@ struct volume_info {
 #define MFT_RECORD_ATTR_OBJECT_ID		0x40
 #define MFT_RECORD_ATTR_END			0xffffffffu
 
-int volume_id_probe_ntfs(struct volume_id *id, uint64_t off)
+int volume_id_probe_ntfs(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	unsigned sector_size;
 	unsigned cluster_size;
 	uint64_t mft_cluster;
diff --git a/util-linux/volume_id/ocfs2.c b/util-linux/volume_id/ocfs2.c
index 8bcaac0b7..8417d91bb 100644
--- a/util-linux/volume_id/ocfs2.c
+++ b/util-linux/volume_id/ocfs2.c
@@ -80,8 +80,9 @@ struct ocfs2_super_block {
 	uint8_t		s_uuid[OCFS2_VOL_UUID_LEN];	/* 128-bit uuid */
 } __attribute__((__packed__));
 
-int volume_id_probe_ocfs2(struct volume_id *id, uint64_t off)
+int volume_id_probe_ocfs2(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	struct ocfs2_super_block *os;
 
 	dbg("probing at offset 0x%llx", (unsigned long long) off);
diff --git a/util-linux/volume_id/reiserfs.c b/util-linux/volume_id/reiserfs.c
index d9a37457b..b8cdc9809 100644
--- a/util-linux/volume_id/reiserfs.c
+++ b/util-linux/volume_id/reiserfs.c
@@ -48,8 +48,9 @@ struct reiser4_super_block {
 #define REISERFS1_SUPERBLOCK_OFFSET		0x2000
 #define REISERFS_SUPERBLOCK_OFFSET		0x10000
 
-int volume_id_probe_reiserfs(struct volume_id *id, uint64_t off)
+int volume_id_probe_reiserfs(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	struct reiserfs_super_block *rs;
 	struct reiser4_super_block *rs4;
 
diff --git a/util-linux/volume_id/romfs.c b/util-linux/volume_id/romfs.c
index 400bdce2c..2c061bdfc 100644
--- a/util-linux/volume_id/romfs.c
+++ b/util-linux/volume_id/romfs.c
@@ -27,8 +27,9 @@ struct romfs_super {
 	uint8_t name[0];
 } __attribute__((__packed__));
 
-int volume_id_probe_romfs(struct volume_id *id, uint64_t off)
+int volume_id_probe_romfs(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	struct romfs_super *rfs;
 
 	dbg("probing at offset 0x%llx", (unsigned long long) off);
diff --git a/util-linux/volume_id/sysv.c b/util-linux/volume_id/sysv.c
index 76719623b..165033258 100644
--- a/util-linux/volume_id/sysv.c
+++ b/util-linux/volume_id/sysv.c
@@ -83,8 +83,9 @@ struct xenix_super {
 #define XENIX_MAGIC				0x2b5544
 #define SYSV_MAX_BLOCKSIZE			0x800
 
-int volume_id_probe_sysv(struct volume_id *id, uint64_t off)
+int volume_id_probe_sysv(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	struct sysv_super *vs;
 	struct xenix_super *xs;
 	unsigned boff;
diff --git a/util-linux/volume_id/udf.c b/util-linux/volume_id/udf.c
index 55e97a7e5..e272e1923 100644
--- a/util-linux/volume_id/udf.c
+++ b/util-linux/volume_id/udf.c
@@ -55,8 +55,9 @@ struct volume_structure_descriptor {
 
 #define UDF_VSD_OFFSET			0x8000
 
-int volume_id_probe_udf(struct volume_id *id, uint64_t off)
+int volume_id_probe_udf(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	struct volume_descriptor *vd;
 	struct volume_structure_descriptor *vsd;
 	unsigned bs;
diff --git a/util-linux/volume_id/util.c b/util-linux/volume_id/util.c
index 1a1b3f92e..dd75c7ba1 100644
--- a/util-linux/volume_id/util.c
+++ b/util-linux/volume_id/util.c
@@ -254,9 +254,15 @@ void *volume_id_get_buffer(struct volume_id *id, uint64_t off, size_t len)
 		dbg("requested 0x%x bytes, got 0x%x bytes",
 				(unsigned) len, (unsigned) read_len);
  err:
-		/* id->seekbuf_len or id->sbbuf_len is wrong now! Fixing.
-		 * Most likely user will not do any additional
-		 * calls anyway, it's a corrupted fs or something. */
+		/* No filesystem can be this tiny. It's most likely
+		 * non-associated loop device, empty drive and so on.
+		 * Flag it, making it possible to short circuit future
+		 * accesses. Rationale:
+		 * users complained of slow blkid due to empty floppy drives.
+		 */
+		if (off < 64*1024)
+			id->error = 1;
+		/* id->seekbuf_len or id->sbbuf_len is wrong now! Fixing. */
 		volume_id_free_buffer(id);
 		return NULL;
 	}
diff --git a/util-linux/volume_id/volume_id.c b/util-linux/volume_id/volume_id.c
index 6852a8203..1acd90596 100644
--- a/util-linux/volume_id/volume_id.c
+++ b/util-linux/volume_id/volume_id.c
@@ -45,8 +45,8 @@
 #define ENABLE_FEATURE_VOLUMEID_UFS           0
 
 
-typedef int (*raid_probe_fptr)(struct volume_id *id, uint64_t off, uint64_t size);
-typedef int (*probe_fptr)(struct volume_id *id, uint64_t off);
+typedef int (*raid_probe_fptr)(struct volume_id *id, /*uint64_t off,*/ uint64_t size);
+typedef int (*probe_fptr)(struct volume_id *id /*, uint64_t off*/);
 
 static const raid_probe_fptr raid1[] = {
 #if ENABLE_FEATURE_VOLUMEID_LINUXRAID
@@ -150,43 +150,49 @@ static const probe_fptr fs2[] = {
 #endif
 };
 
-int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size)
+int volume_id_probe_all(struct volume_id *id, /*uint64_t off,*/ uint64_t size)
 {
 	unsigned i;
 
-	if (id == NULL)
-		return -EINVAL;
-
 	/* probe for raid first, cause fs probes may be successful on raid members */
 	if (size) {
-		for (i = 0; i < ARRAY_SIZE(raid1); i++)
-			if (raid1[i](id, off, size) == 0)
+		for (i = 0; i < ARRAY_SIZE(raid1); i++) {
+			if (raid1[i](id, /*off,*/ size) == 0)
+				goto ret;
+			if (id->error)
 				goto ret;
+		}
 	}
 
-	for (i = 0; i < ARRAY_SIZE(raid2); i++)
-		if (raid2[i](id, off) == 0)
+	for (i = 0; i < ARRAY_SIZE(raid2); i++) {
+		if (raid2[i](id /*,off*/) == 0)
 			goto ret;
+		if (id->error)
+			goto ret;
+	}
 
 	/* signature in the first block, only small buffer needed */
-	for (i = 0; i < ARRAY_SIZE(fs1); i++)
-		if (fs1[i](id, off) == 0)
+	for (i = 0; i < ARRAY_SIZE(fs1); i++) {
+		if (fs1[i](id /*,off*/) == 0)
 			goto ret;
+		if (id->error)
+			goto ret;
+	}
 
 	/* fill buffer with maximum */
 	volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
 
-	for (i = 0; i < ARRAY_SIZE(fs2); i++)
-		if (fs2[i](id, off) == 0)
+	for (i = 0; i < ARRAY_SIZE(fs2); i++) {
+		if (fs2[i](id /*,off*/) == 0)
 			goto ret;
-	return -1;
+		if (id->error)
+			goto ret;
+	}
 
  ret:
-	/* If the filestystem in recognized, we free the allocated buffers,
-	   otherwise they will stay in place for the possible next probe call */
 	volume_id_free_buffer(id);
+	return (- id->error); /* 0 or -1 */
 
-	return 0;
 }
 
 /* open volume by device node */
diff --git a/util-linux/volume_id/volume_id_internal.h b/util-linux/volume_id/volume_id_internal.h
index fe3547d13..d5258c54f 100644
--- a/util-linux/volume_id/volume_id_internal.h
+++ b/util-linux/volume_id/volume_id_internal.h
@@ -63,6 +63,7 @@ struct volume_id_partition {
 struct volume_id {
 	int		fd;
 //	int		fd_close:1;
+	int		error;
 	size_t		sbbuf_len;
 	size_t		seekbuf_len;
 	uint8_t		*sbbuf;
@@ -86,7 +87,7 @@ struct volume_id {
 };
 
 struct volume_id *volume_id_open_node(int fd);
-int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size);
+int volume_id_probe_all(struct volume_id *id, /*uint64_t off,*/ uint64_t size);
 void free_volume_id(struct volume_id *id);
 
 /* util.h */
@@ -164,67 +165,67 @@ void volume_id_free_buffer(struct volume_id *id);
 
 /* RAID */
 
-//int volume_id_probe_highpoint_37x_raid(struct volume_id *id, uint64_t off);
-//int volume_id_probe_highpoint_45x_raid(struct volume_id *id, uint64_t off, uint64_t size);
+//int volume_id_probe_highpoint_37x_raid(struct volume_id *id /*,uint64_t off*/);
+//int volume_id_probe_highpoint_45x_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size);
 
-//int volume_id_probe_intel_software_raid(struct volume_id *id, uint64_t off, uint64_t size);
+//int volume_id_probe_intel_software_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size);
 
-int volume_id_probe_linux_raid(struct volume_id *id, uint64_t off, uint64_t size);
+int volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size);
 
-//int volume_id_probe_lsi_mega_raid(struct volume_id *id, uint64_t off, uint64_t size);
+//int volume_id_probe_lsi_mega_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size);
 
-//int volume_id_probe_nvidia_raid(struct volume_id *id, uint64_t off, uint64_t size);
+//int volume_id_probe_nvidia_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size);
 
-//int volume_id_probe_promise_fasttrack_raid(struct volume_id *id, uint64_t off, uint64_t size);
+//int volume_id_probe_promise_fasttrack_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size);
 
-//int volume_id_probe_silicon_medley_raid(struct volume_id *id, uint64_t off, uint64_t size);
+//int volume_id_probe_silicon_medley_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size);
 
-//int volume_id_probe_via_raid(struct volume_id *id, uint64_t off, uint64_t size);
+//int volume_id_probe_via_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size);
 
-//int volume_id_probe_lvm1(struct volume_id *id, uint64_t off);
-//int volume_id_probe_lvm2(struct volume_id *id, uint64_t off);
+//int volume_id_probe_lvm1(struct volume_id *id /*,uint64_t off*/);
+//int volume_id_probe_lvm2(struct volume_id *id /*,uint64_t off*/);
 
 /* FS */
 
-int volume_id_probe_cramfs(struct volume_id *id, uint64_t off);
+int volume_id_probe_cramfs(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_ext(struct volume_id *id, uint64_t off);
+int volume_id_probe_ext(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_vfat(struct volume_id *id, uint64_t off);
+int volume_id_probe_vfat(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_hfs_hfsplus(struct volume_id *id, uint64_t off);
+int volume_id_probe_hfs_hfsplus(struct volume_id *id /*,uint64_t off*/);
 
-//int volume_id_probe_hpfs(struct volume_id *id, uint64_t off);
+//int volume_id_probe_hpfs(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_iso9660(struct volume_id *id, uint64_t off);
+int volume_id_probe_iso9660(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_jfs(struct volume_id *id, uint64_t off);
+int volume_id_probe_jfs(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_linux_swap(struct volume_id *id, uint64_t off);
+int volume_id_probe_linux_swap(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_luks(struct volume_id *id, uint64_t off);
+int volume_id_probe_luks(struct volume_id *id /*,uint64_t off*/);
 
-//int volume_id_probe_mac_partition_map(struct volume_id *id, uint64_t off);
+//int volume_id_probe_mac_partition_map(struct volume_id *id /*,uint64_t off*/);
 
-//int volume_id_probe_minix(struct volume_id *id, uint64_t off);
+//int volume_id_probe_minix(struct volume_id *id /*,uint64_t off*/);
 
-//int volume_id_probe_msdos_part_table(struct volume_id *id, uint64_t off);
+//int volume_id_probe_msdos_part_table(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_ntfs(struct volume_id *id, uint64_t off);
+int volume_id_probe_ntfs(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_ocfs2(struct volume_id *id, uint64_t off);
+int volume_id_probe_ocfs2(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_reiserfs(struct volume_id *id, uint64_t off);
+int volume_id_probe_reiserfs(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_romfs(struct volume_id *id, uint64_t off);
+int volume_id_probe_romfs(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_sysv(struct volume_id *id, uint64_t off);
+int volume_id_probe_sysv(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_udf(struct volume_id *id, uint64_t off);
+int volume_id_probe_udf(struct volume_id *id /*,uint64_t off*/);
 
-//int volume_id_probe_ufs(struct volume_id *id, uint64_t off);
+//int volume_id_probe_ufs(struct volume_id *id /*,uint64_t off*/);
 
-int volume_id_probe_xfs(struct volume_id *id, uint64_t off);
+int volume_id_probe_xfs(struct volume_id *id /*,uint64_t off*/);
 
 #if __GNUC_PREREQ(4,1)
 # pragma GCC visibility pop
diff --git a/util-linux/volume_id/xfs.c b/util-linux/volume_id/xfs.c
index 0d904370d..646c81d3b 100644
--- a/util-linux/volume_id/xfs.c
+++ b/util-linux/volume_id/xfs.c
@@ -35,8 +35,9 @@ struct xfs_super_block {
 	uint64_t	fdblocks;
 } __attribute__((__packed__));
 
-int volume_id_probe_xfs(struct volume_id *id, uint64_t off)
+int volume_id_probe_xfs(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	struct xfs_super_block *xs;
 
 	dbg("probing at offset 0x%llx", (unsigned long long) off);
-- 
2.25.1