On 06/11/2010 01:31 AM, jeff.liu wrote: > + fiemap->fm_flags = FIEMAP_FLAG_SYNC; If I'm reading the Linux source code correctly, this forces all the dirty blocks in the input file to disk, and forces the kernel to wait until all those blocks actually hit the disk. We don't need that; there shouldn't be a need to force any blocks to hit the disk. All that 'cp' needs to know is: please tell me the next block which might contain nonzero data. Is there some way that we can get that information without forcing the input file's blocks to disk? -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
