Check my post here <a href="http://planet.admon.org/howto/how-to-check-sparse-files-with-perl/">How to Check Sparse Files with Perl</a> For any issues plesae let me know :) J <div class="gmail_quote">On Thu, Mar 11, 2010 at 3:43 AM, Eric Sandeen <<a href="mailto:sandeen@redhat.com">sandeen@redhat.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="im">Sean McCauliff wrote: > Is there a way to find the holes in sparse files, other than assuming > contiguous blocks of zeroes are holes? </div>yes, programatically you can use a couple ioctls: fibmap (block-at-a-time) or fiemap in newer kernels. If you want a commandline, try filefrag -v. For ioctl usage examples, take a look at how filefrag is implemented. # dd if=/dev/zero of=testfile bs=4k count=1; dd if=/dev/zero of=testfile conv=notrunc bs=4k seek=4 count=1 # sync # filefrag -v testfile Filesystem type is: ef53 File size of testfile is 20480 (5 blocks, blocksize 4096) ext logical physical expected length flags 0 0 1829913 1 1 4 1802777 1829913 1 eof testfile: 2 extents found the logical+length gap shows you that there was a hole in there Andreas has patches to make it still clearer in the table output. -Eric <div><div></div><div class="h5"> > Thanks, > Sean > > _______________________________________________ > Ext3-users mailing list > <a href="mailto:Ext3-users@redhat.com">Ext3-users@redhat.com</a> > <a href="https://www.redhat.com/mailman/listinfo/ext3-users" target="_blank">https://www.redhat.com/mailman/listinfo/ext3-users</a> _______________________________________________ Ext3-users mailing list <a href="mailto:Ext3-users@redhat.com">Ext3-users@redhat.com</a> <a href="https://www.redhat.com/mailman/listinfo/ext3-users" target="_blank">https://www.redhat.com/mailman/listinfo/ext3-users</a> </div></div></blockquote></div> -- Sponser and operater: Linux monitoring solution: <a href="http://www.admon.org">http://www.admon.org</a>