On Wed, Aug 06, 2025 at 01:34:49PM +0900, Damien Le Moal wrote: > Enabling XFS realtime subvolume (XFS_RT) is mandatory to support zoned > block devices. If CONFIG_BLK_DEV_ZONED is enabled, automatically select > CONFIG_XFS_RT to allow users to format zoned block devices using XFS. > > Also improve the description of the XFS_RT configuration option to > document that it is reuired for zoned block devices. > > Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx> > --- > fs/xfs/Kconfig | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/fs/xfs/Kconfig b/fs/xfs/Kconfig > index ae0ca6858496..c77118e96b82 100644 > --- a/fs/xfs/Kconfig > +++ b/fs/xfs/Kconfig > @@ -5,6 +5,7 @@ config XFS_FS > select EXPORTFS > select CRC32 > select FS_IOMAP > + select XFS_RT if BLK_DEV_ZONED This looks weird to me. Obligating users to enable an optional feature in xfs if their kernel are configured with a specific block dev feature doesn't sound the right thing to do. What if the user doesn't want to use XFS RT devices even though BLK_DEV_ZONED is enabled, for whatever other purpose? Forcing enabling a filesystem configuration because a specific block feature is enabled doesn't sound the right thing to do IMHO. > help > XFS is a high performance journaling filesystem which originated > on the SGI IRIX platform. It is completely multi-threaded, can > @@ -116,6 +117,15 @@ config XFS_RT > from all other requests, and this can be done quite transparently > to applications via the inherit-realtime directory inode flag. > > + This option is mandatory to support zoned block devices. What if a user wants to use another filesystem for ZBDs instead of XFS, but still want to have XFS enabled? I haven't followed ZBD work too close, but looking at zonedstorage.io, I see that at least btrfs also supports zoned storage. So, what if somebody wants to have btrfs enabled to use zoned storage, but also provides xfs without RT support? Again, I don't think forcefully enabling XFS_RT is the right thing to do. > For these > + devices, the realtime subvolume must be backed by a zoned block > + device and a regular block device used as the main device (for > + metadata). If the zoned block device is a host-managed SMR hard-disk > + containing conventional zones at the beginning of its address space, > + XFS will use the disk conventional zones as the main device and the > + remaining sequential write required zones as the backing storage for > + the realtime subvolume. > + > See the xfs man page in section 5 for additional information. Does it? Only section I see mentions of zoned storage is the mkfs man page. Am I missing something? Carlos > > If unsure, say N. > -- > 2.50.1 >
