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

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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>
This commit is contained in:
Liu Bo 2017-06-27 15:25:45 -06:00 committed by David Sterba
parent bf95b303f4
commit c58d13eeba
1 changed files with 2 additions and 2 deletions
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Documentation/mkfs.btrfs.asciidoc
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@ -76,8 +76,8 @@ Alias for --nodesize. Deprecated.
*-n|--nodesize <size>*:: *-n|--nodesize <size>*::
Specify the nodesize, the tree block size in which btrfs stores metadata. The 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 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 multiple of the sectorsize and a power of 2, but not larger than 64KiB (65536).
equals nodesize and the options are aliases. Leafsize always equals nodesize and the options are aliases.
+ +
Smaller node size increases fragmentation but lead to higher b-trees which in 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 turn leads to lower locking contention. Higher node sizes give better packing