NFS41: make PNFS_BLOCK selectable
PNFS_BLOCK needs BLK_DEV_DM/MD, which is not a dependency for other
pnfs layout drivers. Seperate it out so others can still build when
BLK_DEV_DM/MD is not enabled.
Also change select to depends on to avoid build failures.
Reported-and-tested-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Peng Tao <peng_tao@emc.com>
Acked-by: Benny Halevy <bhalevy@tonian.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index be02077..0d30613 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -79,12 +79,9 @@
depends on NFS_FS && NFS_V4 && EXPERIMENTAL
select SUNRPC_BACKCHANNEL
select PNFS_FILE_LAYOUT
- select PNFS_BLOCK
- select MD
- select BLK_DEV_DM
help
This option enables support for minor version 1 of the NFSv4 protocol
- (RFC 5661 and RFC 5663) in the kernel's NFS client.
+ (RFC 5661) in the kernel's NFS client.
If unsure, say N.
@@ -92,7 +89,14 @@
tristate
config PNFS_BLOCK
- tristate
+ tristate "Provide support for the pNFS Block Layout Driver for NFSv4.1 pNFS (EXPERIMENTAL)"
+ depends on NFS_FS && NFS_V4_1 && BLK_DEV_DM
+ help
+ Say M here if you want your pNFS client to support the Block Layout Driver
+ (RFC 5663). Requires Multiple devices driver support (DM) and Device mapper
+ support (BLK_DEV_DM).
+
+ If unsure, say N.
config PNFS_OBJLAYOUT
tristate "Provide support for the pNFS Objects Layout Driver for NFSv4.1 pNFS (EXPERIMENTAL)"