Btrfs-progs: man: nodesize must be power of 2 now

This updates mkfs.btrfs's man page with the new limitation that nodesize must
be a power of 2 as well.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/Documentation/mkfs.btrfs.asciidoc b/Documentation/mkfs.btrfs.asciidoc
index 46a4d2d..d53d9e2 100644 (file)
--- a/Documentation/mkfs.btrfs.asciidoc
+++ b/Documentation/mkfs.btrfs.asciidoc
@@ -76,8 +76,8 @@ Alias for --nodesize. Deprecated.
 *-n|--nodesize <size>*::
 Specify the nodesize, the tree block size in which btrfs stores metadata. The
 default value is 16KiB (16384) or the page size, whichever is bigger. Must be a
-multiple of the sectorsize, but not larger than 64KiB (65536).  Leafsize always
-equals nodesize and the options are aliases.
+multiple of the sectorsize and a power of 2, but not larger than 64KiB (65536).
+Leafsize always equals nodesize and the options are aliases.
 +
 Smaller node size increases fragmentation but lead to higher b-trees which in
 turn leads to lower locking contention. Higher node sizes give better packing