overflow error with mke2fs

[kvaneesh]

I get the below error

/misc/mke2fs -d //opensource/tools/buildroot/output/build/buildroot-fs/ext2/target -O extents  -t ext4  -L rootfs  //opensource/tools/buildroot/output/images/rootfs.ext2 3G
mke2fs 1.47.3 (8-Jul-2025)
/opensource/tools/buildroot/output/images/rootfs.ext2 contains a ext4 file system labelled 'rootfs'
        created on Wed Dec 31 18:25:01 2025
Proceed anyway? (y,N) y
Discarding device blocks: done                            
Creating filesystem with 786432 4k blocks and 196608 inodes
Filesystem UUID: 1d56ba77-5eb0-40e3-9a09-bf7cd2bb9bfa
Superblock backups stored on blocks: 
        32768, 98304, 163840, 229376, 294912

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (16384 blocks): done
Copying files into the device: __populate_fs: Ext2 file too big while writing file "rootfs.ext2"
mke2fs: Ext2 file too big while populating file system

-d target_dir contain a file of size 3GB.

This is due to the overflow which is fixed by a change below

modified   misc/create_inode.c
@@ -414,7 +414,7 @@ static ssize_t my_pread(int fd, void *buf, size_t count, off_t offset)
 }
 #endif /* !defined HAVE_PREAD64 && !defined HAVE_PREAD */
 
-static errcode_t write_all(ext2_file_t e2_file, ext2_off_t off, const char *buf, unsigned int n_bytes) {
+static errcode_t write_all(ext2_file_t e2_file, ext2_off64_t off, const char *buf, ssize_t n_bytes) {
 	errcode_t err = ext2fs_file_llseek(e2_file, off, EXT2_SEEK_SET, NULL);
 	if (err)
 		return err;

I haven't looked at all the callers of write_all to verify they are passing the file offset correctly. The above change get the mke2fs to work correctly.