[PATCH v2 1/3] libblkid: add interface for FSSIZE field

[Andrey Albershteyn <aalbersh@xxxxxxxxxx>]

Add interface to let filesystem probe calculate and set FSSIZE.
Enable that field in the 'superblocks' sample.

Signed-off-by: Andrey Albershteyn <aalbersh@xxxxxxxxxx>
---
 libblkid/samples/superblocks.c         |  2 +-
 libblkid/src/blkid.h.in                |  1 +
 libblkid/src/superblocks/superblocks.c | 11 +++++++++++
 libblkid/src/superblocks/superblocks.h |  1 +
 4 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/libblkid/samples/superblocks.c b/libblkid/samples/superblocks.c
index 7d9555771..38903ecee 100644
--- a/libblkid/samples/superblocks.c
+++ b/libblkid/samples/superblocks.c
@@ -44,7 +44,7 @@ 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_MAGIC | BLKID_SUBLKS_FSSIZE);
 
 	rc = blkid_do_safeprobe(pr);
 	if (rc == -1)
diff --git a/libblkid/src/blkid.h.in b/libblkid/src/blkid.h.in
index 3cd4116d9..ad4becf0a 100644
--- a/libblkid/src/blkid.h.in
+++ b/libblkid/src/blkid.h.in
@@ -281,6 +281,7 @@ extern int blkid_probe_enable_superblocks(blkid_probe pr, int enable)
 #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_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 f21365538..9adc2cfa3 100644
--- a/libblkid/src/superblocks/superblocks.c
+++ b/libblkid/src/superblocks/superblocks.c
@@ -7,6 +7,7 @@
  * GNU Lesser General Public License.
  */
 
+#include <inttypes.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
@@ -584,6 +585,16 @@ static int blkid_probe_set_usage(blkid_probe pr, int usage)
 	return blkid_probe_set_value(pr, "USAGE", (unsigned char *) u, strlen(u) + 1);
 }
 
+int blkid_probe_set_fssize(blkid_probe pr, uint64_t size)
+{
+	struct blkid_chain *chn = blkid_probe_get_chain(pr);
+
+	if (!(chn->flags & BLKID_SUBLKS_FSSIZE))
+		return 0;
+
+	return blkid_probe_sprintf_value(pr, "FSSIZE", "%" PRIu64, size);
+}
+
 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 9c489c438..67803679f 100644
--- a/libblkid/src/superblocks/superblocks.h
+++ b/libblkid/src/superblocks/superblocks.h
@@ -111,6 +111,7 @@ extern int blkid_probe_set_utf8_id_label(blkid_probe pr, const char *name,
 			     const unsigned char *data, size_t len, int enc);
 
 int blkid_probe_set_block_size(blkid_probe pr, unsigned block_size);
+int blkid_probe_set_fssize(blkid_probe pr, uint64_t size);
 
 extern int blkid_probe_is_bitlocker(blkid_probe pr);
 extern int blkid_probe_is_ntfs(blkid_probe pr);
-- 
2.27.0