From fb9ea75a8a69b06eb6a4039b841ce3ccabb76775 Mon Sep 17 00:00:00 2001
From: Andrey Albershteyn <aalbersh@redhat.com>
Date: Wed, 27 Apr 2022 13:24:56 +0200
Subject: libblkid: add FSLASTBLOCK field interface showing area occupied by fs

Add interface to let filesystem set FSLASTBLOCK which is basically
total number of fsblocks (area occupied by fs). Enable that field in
the 'superblocks' sample.

Upstream: http://github.com/util-linux/util-linux/commit/b7cb26ec3
Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2064810
Signed-off-by: Andrey Albershteyn <aalbersh@redhat.com>
---
 libblkid/samples/superblocks.c         |  3 ++-
 libblkid/src/blkid.h.in                | 23 ++++++++++++-----------
 libblkid/src/superblocks/superblocks.c | 13 +++++++++++++
 libblkid/src/superblocks/superblocks.h |  1 +
 4 files changed, 28 insertions(+), 12 deletions(-)

diff --git a/libblkid/samples/superblocks.c b/libblkid/samples/superblocks.c
index 38903ecee..b7f94ec14 100644
--- a/libblkid/samples/superblocks.c
+++ b/libblkid/samples/superblocks.c
@@ -44,7 +44,8 @@ int main(int argc, char *argv[])
 			BLKID_SUBLKS_UUID | BLKID_SUBLKS_UUIDRAW |
 			BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
 			BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION |
-			BLKID_SUBLKS_MAGIC | BLKID_SUBLKS_FSSIZE);
+			BLKID_SUBLKS_MAGIC | BLKID_SUBLKS_FSSIZE |
+			BLKID_SUBLKS_FSLASTBLOCK);
 
 	rc = blkid_do_safeprobe(pr);
 	if (rc == -1)
diff --git a/libblkid/src/blkid.h.in b/libblkid/src/blkid.h.in
index ad4becf0a..56e64f9ab 100644
--- a/libblkid/src/blkid.h.in
+++ b/libblkid/src/blkid.h.in
@@ -271,17 +271,18 @@ extern int blkid_superblocks_get_name(size_t idx, const char **name, int *usage)
 extern int blkid_probe_enable_superblocks(blkid_probe pr, int enable)
 			__ul_attribute__((nonnull));
 
-#define BLKID_SUBLKS_LABEL	(1 << 1) /* read LABEL from superblock */
-#define BLKID_SUBLKS_LABELRAW	(1 << 2) /* read and define LABEL_RAW result value*/
-#define BLKID_SUBLKS_UUID	(1 << 3) /* read UUID from superblock */
-#define BLKID_SUBLKS_UUIDRAW	(1 << 4) /* read and define UUID_RAW result value */
-#define BLKID_SUBLKS_TYPE	(1 << 5) /* define TYPE result value */
-#define BLKID_SUBLKS_SECTYPE	(1 << 6) /* define compatible fs type (second type) */
-#define BLKID_SUBLKS_USAGE	(1 << 7) /* define USAGE result value */
-#define BLKID_SUBLKS_VERSION	(1 << 8) /* read FS type from superblock */
-#define BLKID_SUBLKS_MAGIC	(1 << 9) /* define SBMAGIC and SBMAGIC_OFFSET */
-#define BLKID_SUBLKS_BADCSUM	(1 << 10) /* allow a bad checksum */
-#define BLKID_SUBLKS_FSSIZE	(1 << 11) /* read and define FSSIZE from superblock */
+#define BLKID_SUBLKS_LABEL		(1 << 1) /* read LABEL from superblock */
+#define BLKID_SUBLKS_LABELRAW		(1 << 2) /* read and define LABEL_RAW result value*/
+#define BLKID_SUBLKS_UUID		(1 << 3) /* read UUID from superblock */
+#define BLKID_SUBLKS_UUIDRAW		(1 << 4) /* read and define UUID_RAW result value */
+#define BLKID_SUBLKS_TYPE		(1 << 5) /* define TYPE result value */
+#define BLKID_SUBLKS_SECTYPE		(1 << 6) /* define compatible fs type (second type) */
+#define BLKID_SUBLKS_USAGE		(1 << 7) /* define USAGE result value */
+#define BLKID_SUBLKS_VERSION		(1 << 8) /* read FS type from superblock */
+#define BLKID_SUBLKS_MAGIC		(1 << 9) /* define SBMAGIC and SBMAGIC_OFFSET */
+#define BLKID_SUBLKS_BADCSUM		(1 << 10) /* allow a bad checksum */
+#define BLKID_SUBLKS_FSSIZE		(1 << 11) /* read and define FSSIZE from superblock */
+#define BLKID_SUBLKS_FSLASTBLOCK	(1 << 12) /* read and define FSLASTBLOCK from superblock */
 
 #define BLKID_SUBLKS_DEFAULT	(BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID | \
 				 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE)
diff --git a/libblkid/src/superblocks/superblocks.c b/libblkid/src/superblocks/superblocks.c
index adf4ee025..5b899a830 100644
--- a/libblkid/src/superblocks/superblocks.c
+++ b/libblkid/src/superblocks/superblocks.c
@@ -68,6 +68,8 @@
  *
  * @FSSIZE: size of filesystem (implemented for XFS only)
  *
+ * @FSLASTBLOCK: last fsblock/total number of fsblocks
+ *
  * @SYSTEM_ID: ISO9660 system identifier
  *
  * @PUBLISHER_ID: ISO9660 publisher identifier
@@ -595,6 +597,17 @@ int blkid_probe_set_fssize(blkid_probe pr, uint64_t size)
 	return blkid_probe_sprintf_value(pr, "FSSIZE", "%" PRIu64, size);
 }
 
+int blkid_probe_set_fslastblock(blkid_probe pr, uint64_t lastblock)
+{
+	struct blkid_chain *chn = blkid_probe_get_chain(pr);
+
+	if (!(chn->flags & BLKID_SUBLKS_FSLASTBLOCK))
+		return 0;
+
+	return blkid_probe_sprintf_value(pr, "FSLASTBLOCK", "%" PRIu64,
+			lastblock);
+}
+
 int blkid_probe_set_id_label(blkid_probe pr, const char *name,
 			     const unsigned char *data, size_t len)
 {
diff --git a/libblkid/src/superblocks/superblocks.h b/libblkid/src/superblocks/superblocks.h
index 67803679f..251e2e386 100644
--- a/libblkid/src/superblocks/superblocks.h
+++ b/libblkid/src/superblocks/superblocks.h
@@ -112,6 +112,7 @@ extern int blkid_probe_set_utf8_id_label(blkid_probe pr, const char *name,
 
 int blkid_probe_set_block_size(blkid_probe pr, unsigned block_size);
 int blkid_probe_set_fssize(blkid_probe pr, uint64_t size);
+int blkid_probe_set_fslastblock(blkid_probe pr, uint64_t lastblock);
 
 extern int blkid_probe_is_bitlocker(blkid_probe pr);
 extern int blkid_probe_is_ntfs(blkid_probe pr);
-- 
2.36.1