On Mon, 2 May 2011, Greg KH wrote: > On Mon, May 02, 2011 at 01:25:04PM +0200, Lukas Czerner wrote: > > Currently there is no convenient way how to get the information from > > userspace whether or not the block device supports discard other > > than try to call BLKDISCARD ioctl and check the result, which is not > > really good way to do it. > > > > We already have BLKDISCARDZEROES ioctl and > > /sys/block/sda/queue/discard_zeroes_data to tell whether subsequent > > reads after discard returns all zeroes. This commit adds at least sysfs > > interface /sys/block/sda/queue/discard_support to tell whether device > > support discard. > > > > Signed-off-by: Lukas Czerner <lczerner@xxxxxxxxxx> > > Cc: Jens Axboe <jaxboe@xxxxxxxxxxxx> > > Cc: Jeff Moyer <jmoyer@xxxxxxxxxx> > > --- > > block/blk-sysfs.c | 11 +++++++++++ > > If you ever change/add/remove a sysfs file, you also need a > Documentation/ABI/ entry. Please include that in the next revision of > this patch, if you do one. > > thanks, Oh, thanks Greg I will do it next time as I will not do a next revision of this patch. -Lukas > > greg k-h > -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
