Re: [PATCH NFS 3/3] Replace nfs_block_bits() with roundup_pow_of_two()

[Rene Scharfe <rene.scharfe@lsrfire.ath.cx>]

On Tue, Jul 26, 2005 at 01:48:46PM -0400, Trond Myklebust wrote:
> I really don't like the choice of name. If you feel you must change the
> name, then make it something like nfs_blocksize_align(). That describes
> its function, instead of the implementation details.

Yes, rounddown_pow_of_two() belongs in kernel.h next to
roundup_pow_of_two().  And maybe it should get a shorter name.

Anyway, I also don't like "nfs_blocksize_align".  So let's simply keep
the old name.  Renaming can be done later if really needed.

Rene


[PATCH 3/3] Simplify nfs_block_bits()

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
---

 fs/nfs/inode.c |   12 ++----------
 1 files changed, 2 insertions(+), 10 deletions(-)

ddad5eadf4c2907842bf9baa2610e0a35ea14137
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -189,16 +189,8 @@ nfs_umount_begin(struct super_block *sb)
 static inline unsigned long
 nfs_block_bits(unsigned long bsize)
 {
-	/* make sure blocksize is a power of two */
-	if (bsize & (bsize - 1)) {
-		unsigned char	nrbits;
-
-		for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
-			;
-		bsize = 1 << nrbits;
-	}
-
-	return bsize;
+	/* round down to the nearest power of two */
+	return bsize ? (1UL << (fls(bsize) - 1)) : 0;
 }
 
 /*