backport fix #13 to version 0.9.3:

cosmos72 · cosmos72 · commit 0d36162e7f51 · 2019-04-03T19:53:29.000+02:00
fix reproducible filesystem corruption with too-low RAM buffer size:
the loop copying continuous segments larger than RAM buffer was bugged,
it incremented only one iteration variable instead of all three
diff --git a/fsremap/src/io/io_posix.cc b/fsremap/src/io/io_posix.cc
@@ -974,6 +974,8 @@ int fr_io_posix::flush_copy_bytes(fr_dir dir, fr_vector<ft_uoff> & request_vec)
                         || (err = flush_bytes()) != 0)
                         break;
 
+                    from_offset += (ft_uoff) buf_length;
+                    to_offset += (ft_uoff) buf_length;
                     length -= (ft_uoff) buf_length;
                 }
                 if (err != 0)

Original file line number	Diff line number	Diff line change
`@@ -974,6 +974,8 @@ int fr_io_posix::flush_copy_bytes(fr_dir dir, fr_vector<ft_uoff> & request_vec)`
`974`	`974`	`\|\| (err = flush_bytes()) != 0)`
`975`	`975`	`break;`
`976`	`976`
	`977`	`+ from_offset += (ft_uoff) buf_length;`
	`978`	`+ to_offset += (ft_uoff) buf_length;`
`977`	`979`	`length -= (ft_uoff) buf_length;`
`978`	`980`	`}`
`979`	`981`	`if (err != 0)`