On Mon, Feb 28, 2011 at 11:42:48PM -0700, Andreas Dilger wrote: > On 2011-02-28, at 8:08 PM, Allison Henderson wrote: > > This first patch adds a function to convert a range of blocks > > to an uninitialized extent. This function will > > be used to first convert the blocks to extents before > > punching them out. > > This was proposed as a separate function for FALLOCATE by Dave > Chinner (based on XFS_IOC_ZERO_RANGE), so this is useful as a > standalone function. XFS_IOC_ZERO_RANGE converts a range to unwritten extents, not uninitialised extents. An uninitialised extent is one that is allocated but had not data written to it (i.e. contains stale data), while an unwritten/preallocated extent is guaranteed to contain zeros. This may be just a terminology issue, but we should try to use the same jargon across all filesystems... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- 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
