On Mon, Feb 17, 2014 at 04:08:17PM +0100, Lukas Czerner wrote: > Introduce new FALLOC_FL_ZERO_RANGE flag for fallocate. This has the same > functionality as xfs ioctl XFS_IOC_ZERO_RANGE. Lukas, can you please also send a man page update for FALLOC_FL_ZERO_RANGE now that is has been merged? > > It can be used to convert a range of file to zeros preferably without > issuing data IO. Blocks should be preallocated for the regions that span > holes in the file, and the entire range is preferable converted to > unwritten extents - even though file system may choose to zero out the > extent or do whatever which will result in reading zeros from the range > while the range remains allocated for the file. > > This can be also used to preallocate blocks past EOF in the same way as > with fallocate. Flag FALLOC_FL_KEEP_SIZE which should cause the inode > size to remain the same. > > You can test this feature yourself using xfstests, of fallocate(1) however > you'll need patches for util_linux, xfsprogs and xfstests which you > can find here: > > http://people.redhat.com/lczerner/zero_range/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
