On Mon, Jan 27, 2014 at 08:47:09AM +0000, Hugo Mills wrote: > On Mon, Jan 27, 2014 at 04:52:50PM +0800, Anand Jain wrote: > > The user land progs needs a simple way to read > > the raw list of disks and its parameters as > > btrfs kernel understands it. This patch will > > introduce BTRFS_IOC_GET_DEVS which dumps > > every thing under fs_devices. > > > > As of now btrfs-devlist uses this ioctl. > > > > In the long run this ioctl would help to optimize > > some part of btrfs-progs, mainly the current > > btrfs filesystem show > > Just thinking out loud here, really, but can we export this > information in /sys instead, rather than adding yet more ioctls?
I tend to agree that this belongs to sysfs, it's more flexible in case we'll add more per-device stats, ie. one file that holds all the stats about the device. This is also easier to use from scripts that gather system information. With 3.14 the sysfs interface is available, but the devices under /sys/fs/btrfs/<fs-uuid>/devices/... are symlinks to the sysfs devices, so this btrfs-specific device information has to be located in a separate directory. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
