On Fri, Sep 09, 2016 at 07:36:06PM +0800, Jerry Lee wrote:

I have a file system with 4K block size on a 32K page size platform, and
something strange happened when expanding the file system from size 17TB to
20TB.  It seems that the new file system size is not calculated correctly.

$ resize2fs /dev/mapper/dev
resize2fs 1.43.3 (04-Sep-2016)
Filesystem at /dev/mapper/dev is mounted on /share/DATA; on-line
resizing required
resize2fs: On-line shrinking not supported

After digging into the issue, I find that the following operation makes the
high 32bit of the new_size variable be wiped out and results in a smaller
size compared to the currently used block counts.

Thanks for the report; I've applied your suggested fix.

       	       	       	    	    - Ted