From 0df8fcce46695d24edea6218bb460cce0818b0d0 Mon Sep 17 00:00:00 2001
From: Ralph Ronnquist <rrq@rrq.au>
Date: Wed, 28 Jun 2023 16:06:26 +1000
Subject: [PATCH 1/1] Fix size dubbling. Handle block device fragment.

---
 fusefile.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/fusefile.c b/fusefile.c
index f886287..5f7850b 100644
--- a/fusefile.c
+++ b/fusefile.c
@@ -33,6 +33,8 @@
 #include <unistd.h>
 #include <time.h>
 #include <errno.h>
+#include <sys/ioctl.h>
+#include <linux/fs.h>
 
 struct Region {
     off_t beg;
@@ -313,6 +315,15 @@ static int setup_source(struct Source *p,char *frag) {
 	fprintf( stderr, "** %s opened read-only\n", p->filename );
     }
     p->from = 0;
+    if ( S_ISBLK( filestat.st_mode ) ) {
+	// Block devices report size differently:
+	if ( ioctl( p->fd, BLKGETSIZE64, &filestat.st_size ) < 0 ) {
+	    perror( p->filename );
+	}
+#if DEBUG
+	fprintf( stderr, "block device size = %ld\n", filestat.st_size );
+#endif
+    }
     p->to = filestat.st_size;
     // Process any range variation
     if ( range && *(++range) ) {
@@ -375,8 +386,6 @@ static int setup_sources(char **argv,int i,int n) {
 	if ( setup_source( p, argv[i] ) ) {
 	    return 1;
 	}
-	p->start = sources.size; // the fusefile position of fragment
-	sources.size += p->to - p->from;
 #if DEBUG
 	print_source( p );
 #endif
-- 
2.39.2