On Tue, Feb 26, 2019 at 03:45:22PM +0000, Gero Schumacher wrote:
Hi,
when I try to load a sparse file via ext4load, I am getting the error message 'invalid extent'
After a deeper look in the code, it seems to be an issue in the function ext4fs_get_extent_block in fs/ext4/ext4_common.c:
The file starts with 1k of zeros. The blocksize is 1024. So the first extend block contains the following information:
eh_entries: 1 eh_depth: 1 ei_block 1
When the upper layer (ext4fs_read_file) asks for fileblock 0, we are running in the 'invalid extent' error message. For me it seems, that the code is not prepared for handling a sparse block at the beginning of the file. The following change, solved my problem:
I am really not an expert in ext4 filesystems. Can somebody please have a look at this issue and give me a feedback, if I am totally wrong or not?
diff --git a/fs/ext4/ext4_common.c b/fs/ext4/ext4_common.c index 67e2471bd3..7c8080d740 100644
Applied to u-boot/master, thanks!