[PATCH 0/2] mdadm: Fix --detail --export issue

[PATCH 0/2] mdadm: Fix --detail --export issue

[Mariusz Tkaczyk]

Commit 60c19530dd7c ("Detail: remove duplicated code") introduced
regression catched by 00confnames because generated UUID was different
than expected. This patchset fixes the issue.

Mariusz Tkaczyk (2):
  mdadm: set swapuuid in all handlers
  mdadm: Fix native --detail --export

Cc: Xiao Ni <xni@redhat.com>
Cc: Jes Sorensen <jes@trained-monkey.org>

 Detail.c      | 26 +++++++++++++++++++++++++-
 mdadm.h       |  3 +--
 super-ddf.c   | 11 ++++++-----
 super-intel.c | 17 +++++++++--------
 super0.c      |  2 ++
 util.c        | 24 +++++++++++++-----------
 6 files changed, 56 insertions(+), 27 deletions(-)

-- 
2.35.3

[PATCH 1/2] mdadm: set swapuuid in all handlers

[Mariusz Tkaczyk]

It is not set, so it should be 0 but it may vary on compilation
settings. Set it always to 0.

metadata should care to set UUID and read in proper endianness so it
doesn't follow super1 concept of swapuuid to depend on endianness.

It is not an attempt to fix endianness issues.

Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
---
 super-ddf.c   | 1 +
 super-intel.c | 1 +
 super0.c      | 2 ++
 3 files changed, 4 insertions(+)

diff --git a/super-ddf.c b/super-ddf.c
index 7571e3b740c6..94ac5ff3965a 100644
--- a/super-ddf.c
+++ b/super-ddf.c
@@ -5162,6 +5162,7 @@ struct superswitch super_ddf = {
 	.default_geometry = default_geometry_ddf,
 
 	.external	= 1,
+	.swapuuid	= 0,
 
 /* for mdmon */
 	.open_new       = ddf_open_new,
diff --git a/super-intel.c b/super-intel.c
index 7714045575b2..e1754f29246c 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -13116,6 +13116,7 @@ struct superswitch super_imsm = {
 	.validate_ppl	= validate_ppl_imsm,
 
 	.external	= 1,
+	.swapuuid	= 0,
 	.name = "imsm",
 
 /* for mdmon */
diff --git a/super0.c b/super0.c
index a7c5f813d926..9b8a1bd63bb7 100644
--- a/super0.c
+++ b/super0.c
@@ -1369,5 +1369,7 @@ struct superswitch super0 = {
 	.locate_bitmap = locate_bitmap0,
 	.write_bitmap = write_bitmap0,
 	.free_super = free_super0,
+
+	.swapuuid = 0,
 	.name = "0.90",
 };
-- 
2.35.3

[PATCH 2/2] mdadm: Fix native --detail --export

[Mariusz Tkaczyk]

Mentioned commit (see Fixes) causes that UUID is not swapped as expected
for native superblock. Fix this problem.

For detail, we should avoid superblock calls, we can have information
about supertype from map, use that.

Simplify fname_from_uuid() by removing dependencies to metadata
handler, it is not needed. Decision is taken at compile time, expect
super1 but this function is not used by super1. Add warning about that.
Remove separator, it is always ':'.

Fixes: 60c19530dd7c ("Detail: remove duplicated code")
Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
---
 Detail.c      | 26 +++++++++++++++++++++++++-
 mdadm.h       |  3 +--
 super-ddf.c   | 10 +++++-----
 super-intel.c | 16 ++++++++--------
 util.c        | 24 +++++++++++++-----------
 5 files changed, 52 insertions(+), 27 deletions(-)

diff --git a/Detail.c b/Detail.c
index f23ec16f81bc..55a086d3378f 100644
--- a/Detail.c
+++ b/Detail.c
@@ -49,6 +49,30 @@ static int add_device(const char *dev, char ***p_devices,
 	return n_devices + 1;
 }
 
+/**
+ * detail_fname_from_uuid() - generate uuid string with special super1 handling.
+ * @mp: map entry to parse.
+ * @buf: buf to write.
+ *
+ * Hack to workaround an issue with super1 superblocks. It swapuuid set in order for assembly
+ * to work, but can't have it set if we want this printout to match all the other uuid printouts
+ * in super1.c, so we force swapuuid to 1 to make our printout match the rest of super1.
+ *
+ * Always convert uuid if host is big endian.
+ */
+char *detail_fname_from_uuid(struct map_ent *mp, char *buf)
+{
+#if __BYTE_ORDER == BIG_ENDIAN
+	bool swap = true;
+#else
+	bool swap = false;
+#endif
+	if (strncmp(mp->metadata, "1.", 2) == 0)
+		swap = true;
+
+	return __fname_from_uuid(mp->uuid, swap, buf, ':');
+}
+
 int Detail(char *dev, struct context *c)
 {
 	/*
@@ -256,7 +280,7 @@ int Detail(char *dev, struct context *c)
 			mp = map_by_devnm(&map, fd2devnm(fd));
 
 		if (mp) {
-			__fname_from_uuid(mp->uuid, 0, nbuf, ':');
+			detail_fname_from_uuid(mp, nbuf);
 			printf("MD_UUID=%s\n", nbuf + 5);
 			if (mp->path && strncmp(mp->path, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0)
 				printf("MD_DEVNAME=%s\n", mp->path + DEV_MD_DIR_LEN);
diff --git a/mdadm.h b/mdadm.h
index 3fedca484bdd..a363708a2710 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -1696,8 +1696,7 @@ extern const int uuid_zero[4];
 extern int same_uuid(int a[4], int b[4], int swapuuid);
 extern void copy_uuid(void *a, int b[4], int swapuuid);
 extern char *__fname_from_uuid(int id[4], int swap, char *buf, char sep);
-extern char *fname_from_uuid(struct supertype *st,
-			     struct mdinfo *info, char *buf, char sep);
+extern char *fname_from_uuid(struct mdinfo *info, char *buf);
 extern unsigned long calc_csum(void *super, int bytes);
 extern int enough(int level, int raid_disks, int layout, int clean,
 		   char *avail);
diff --git a/super-ddf.c b/super-ddf.c
index 94ac5ff3965a..21426c753c6d 100644
--- a/super-ddf.c
+++ b/super-ddf.c
@@ -1617,7 +1617,7 @@ static void brief_examine_super_ddf(struct supertype *st, int verbose)
 	struct mdinfo info;
 	char nbuf[64];
 	getinfo_super_ddf(st, &info, NULL);
-	fname_from_uuid(st, &info, nbuf, ':');
+	fname_from_uuid(&info, nbuf);
 
 	printf("ARRAY metadata=ddf UUID=%s\n", nbuf + 5);
 }
@@ -1632,7 +1632,7 @@ static void brief_examine_subarrays_ddf(struct supertype *st, int verbose)
 	unsigned int i;
 	char nbuf[64];
 	getinfo_super_ddf(st, &info, NULL);
-	fname_from_uuid(st, &info, nbuf, ':');
+	fname_from_uuid(&info, nbuf);
 
 	for (i = 0; i < be16_to_cpu(ddf->virt->max_vdes); i++) {
 		struct virtual_entry *ve = &ddf->virt->entries[i];
@@ -1645,7 +1645,7 @@ static void brief_examine_subarrays_ddf(struct supertype *st, int verbose)
 		ddf->currentconf =&vcl;
 		vcl.vcnum = i;
 		uuid_from_super_ddf(st, info.uuid);
-		fname_from_uuid(st, &info, nbuf1, ':');
+		fname_from_uuid(&info, nbuf1);
 		_ddf_array_name(namebuf, ddf, i);
 		printf("ARRAY%s%s container=%s member=%d UUID=%s\n",
 		       namebuf[0] == '\0' ? "" : " " DEV_MD_DIR, namebuf,
@@ -1658,7 +1658,7 @@ static void export_examine_super_ddf(struct supertype *st)
 	struct mdinfo info;
 	char nbuf[64];
 	getinfo_super_ddf(st, &info, NULL);
-	fname_from_uuid(st, &info, nbuf, ':');
+	fname_from_uuid(&info, nbuf);
 	printf("MD_METADATA=ddf\n");
 	printf("MD_LEVEL=container\n");
 	printf("MD_UUID=%s\n", nbuf+5);
@@ -1798,7 +1798,7 @@ static void brief_detail_super_ddf(struct supertype *st, char *subarray)
 		return;
 	else
 		uuid_of_ddf_subarray(ddf, vcnum, info.uuid);
-	fname_from_uuid(st, &info, nbuf,':');
+	fname_from_uuid(&info, nbuf);
 	printf(" UUID=%s", nbuf + 5);
 }
 
diff --git a/super-intel.c b/super-intel.c
index e1754f29246c..ff2590fef63f 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -2217,7 +2217,7 @@ static void examine_super_imsm(struct supertype *st, char *homehost)
 	else
 		printf("not supported\n");
 	getinfo_super_imsm(st, &info, NULL);
-	fname_from_uuid(st, &info, nbuf, ':');
+	fname_from_uuid(&info, nbuf);
 	printf("           UUID : %s\n", nbuf + 5);
 	sum = __le32_to_cpu(mpb->check_sum);
 	printf("       Checksum : %08x %s\n", sum,
@@ -2242,7 +2242,7 @@ static void examine_super_imsm(struct supertype *st, char *homehost)
 
 		super->current_vol = i;
 		getinfo_super_imsm(st, &info, NULL);
-		fname_from_uuid(st, &info, nbuf, ':');
+		fname_from_uuid(&info, nbuf);
 		print_imsm_dev(super, dev, nbuf + 5, super->disks->index);
 	}
 	for (i = 0; i < mpb->num_disks; i++) {
@@ -2267,7 +2267,7 @@ static void brief_examine_super_imsm(struct supertype *st, int verbose)
 	char nbuf[64];
 
 	getinfo_super_imsm(st, &info, NULL);
-	fname_from_uuid(st, &info, nbuf, ':');
+	fname_from_uuid(&info, nbuf);
 	printf("ARRAY metadata=imsm UUID=%s\n", nbuf + 5);
 }
 
@@ -2284,13 +2284,13 @@ static void brief_examine_subarrays_imsm(struct supertype *st, int verbose)
 		return;
 
 	getinfo_super_imsm(st, &info, NULL);
-	fname_from_uuid(st, &info, nbuf, ':');
+	fname_from_uuid(&info, nbuf);
 	for (i = 0; i < super->anchor->num_raid_devs; i++) {
 		struct imsm_dev *dev = get_imsm_dev(super, i);
 
 		super->current_vol = i;
 		getinfo_super_imsm(st, &info, NULL);
-		fname_from_uuid(st, &info, nbuf1, ':');
+		fname_from_uuid(&info, nbuf1);
 		printf("ARRAY " DEV_MD_DIR "%.16s container=%s member=%d UUID=%s\n",
 		       dev->volume, nbuf + 5, i, nbuf1 + 5);
 	}
@@ -2304,7 +2304,7 @@ static void export_examine_super_imsm(struct supertype *st)
 	char nbuf[64];
 
 	getinfo_super_imsm(st, &info, NULL);
-	fname_from_uuid(st, &info, nbuf, ':');
+	fname_from_uuid(&info, nbuf);
 	printf("MD_METADATA=imsm\n");
 	printf("MD_LEVEL=container\n");
 	printf("MD_UUID=%s\n", nbuf+5);
@@ -2324,7 +2324,7 @@ static void detail_super_imsm(struct supertype *st, char *homehost,
 		super->current_vol = strtoul(subarray, NULL, 10);
 
 	getinfo_super_imsm(st, &info, NULL);
-	fname_from_uuid(st, &info, nbuf, ':');
+	fname_from_uuid(&info, nbuf);
 	printf("\n              UUID : %s\n", nbuf + 5);
 
 	super->current_vol = temp_vol;
@@ -2341,7 +2341,7 @@ static void brief_detail_super_imsm(struct supertype *st, char *subarray)
 		super->current_vol = strtoul(subarray, NULL, 10);
 
 	getinfo_super_imsm(st, &info, NULL);
-	fname_from_uuid(st, &info, nbuf, ':');
+	fname_from_uuid(&info, nbuf);
 	printf(" UUID=%s", nbuf + 5);
 
 	super->current_vol = temp_vol;
diff --git a/util.c b/util.c
index 49a9c6e29cf7..03336d6fa24c 100644
--- a/util.c
+++ b/util.c
@@ -589,19 +589,21 @@ char *__fname_from_uuid(int id[4], int swap, char *buf, char sep)
 
 }
 
-char *fname_from_uuid(struct supertype *st, struct mdinfo *info,
-		      char *buf, char sep)
-{
-	// dirty hack to work around an issue with super1 superblocks...
-	// super1 superblocks need swapuuid set in order for assembly to
-	// work, but can't have it set if we want this printout to match
-	// all the other uuid printouts in super1.c, so we force swapuuid
-	// to 1 to make our printout match the rest of super1
+/**
+ * fname_from_uuid() - generate uuid string. Should not be used with super1.
+ * @info: info with uuid
+ * @buf: buf to fill.
+ *
+ * This routine should not be used with super1. See detail_fname_from_uuid() for details. It does
+ * not use superswitch swapuuid as it should be 0 but it has to do UUID conversion if host is big
+ * endian- left for backward compatibility.
+ */
+char *fname_from_uuid(struct mdinfo *info, char *buf)
+{
 #if __BYTE_ORDER == BIG_ENDIAN
-	return __fname_from_uuid(info->uuid, 1, buf, sep);
+	return __fname_from_uuid(info->uuid, true, buf, ':');
 #else
-	return __fname_from_uuid(info->uuid, (st->ss == &super1) ? 1 :
-				 st->ss->swapuuid, buf, sep);
+	return __fname_from_uuid(info->uuid, false, buf, ':');
 #endif
 }
 
-- 
2.35.3

Re: [PATCH 0/2] mdadm: Fix --detail --export issue

[Mariusz Tkaczyk]

On Mon, 18 Mar 2024 16:19:28 +0100
Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com> wrote:

> Commit 60c19530dd7c ("Detail: remove duplicated code") introduced
> regression catched by 00confnames because generated UUID was different
> than expected. This patchset fixes the issue.
> 
> Mariusz Tkaczyk (2):
>   mdadm: set swapuuid in all handlers
>   mdadm: Fix native --detail --export
> 
> Cc: Xiao Ni <xni@redhat.com>
> Cc: Jes Sorensen <jes@trained-monkey.org>
> 
>  Detail.c      | 26 +++++++++++++++++++++++++-
>  mdadm.h       |  3 +--
>  super-ddf.c   | 11 ++++++-----
>  super-intel.c | 17 +++++++++--------
>  super0.c      |  2 ++
>  util.c        | 24 +++++++++++++-----------
>  6 files changed, 56 insertions(+), 27 deletions(-)
> 

Applied! 

Thanks,
Mariusz