linux-kernel - RE: [PATCH] fs/ntfs3: Use linux/log2 is_power_of

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Date:   Fri, 27 Aug 2021 16:08:34 +0000
From:   Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
To:     Kari Argillander <kari.argillander@...il.com>,
        "ntfs3@...ts.linux.dev" <ntfs3@...ts.linux.dev>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: RE: [PATCH] fs/ntfs3: Use linux/log2 is_power_of_2 function

> From: Kari Argillander <kari.argillander@...il.com>
> Sent: Monday, August 16, 2021 1:38 PM
> To: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>; ntfs3@...ts.linux.dev
> Cc: Kari Argillander <kari.argillander@...il.com>; linux-kernel@...r.kernel.org; linux-fsdevel@...r.kernel.org
> Subject: [PATCH] fs/ntfs3: Use linux/log2 is_power_of_2 function
> 
> We do not need our own implementation for this function in this
> driver. It is much better to use generic one.
> 
> Signed-off-by: Kari Argillander <kari.argillander@...il.com>
> ---
>  fs/ntfs3/ntfs_fs.h | 5 -----
>  fs/ntfs3/run.c     | 3 ++-
>  fs/ntfs3/super.c   | 9 +++++----
>  3 files changed, 7 insertions(+), 10 deletions(-)
> 
> diff --git a/fs/ntfs3/ntfs_fs.h b/fs/ntfs3/ntfs_fs.h
> index 0c3ac89c3115..c8ea6dd38c21 100644
> --- a/fs/ntfs3/ntfs_fs.h
> +++ b/fs/ntfs3/ntfs_fs.h
> @@ -972,11 +972,6 @@ static inline struct buffer_head *ntfs_bread(struct super_block *sb,
>  	return NULL;
>  }
> 
> -static inline bool is_power_of2(size_t v)
> -{
> -	return v && !(v & (v - 1));
> -}
> -
>  static inline struct ntfs_inode *ntfs_i(struct inode *inode)
>  {
>  	return container_of(inode, struct ntfs_inode, vfs_inode);
> diff --git a/fs/ntfs3/run.c b/fs/ntfs3/run.c
> index 5cdf6efe67e0..ce6bff3568df 100644
> --- a/fs/ntfs3/run.c
> +++ b/fs/ntfs3/run.c
> @@ -9,6 +9,7 @@
>  #include <linux/blkdev.h>
>  #include <linux/buffer_head.h>
>  #include <linux/fs.h>
> +#include <linux/log2.h>
>  #include <linux/nls.h>
> 
>  #include "debug.h"
> @@ -376,7 +377,7 @@ bool run_add_entry(struct runs_tree *run, CLST vcn, CLST lcn, CLST len,
>  			if (!used) {
>  				bytes = 64;
>  			} else if (used <= 16 * PAGE_SIZE) {
> -				if (is_power_of2(run->allocated))
> +				if (is_power_of_2(run->allocated))
>  					bytes = run->allocated << 1;
>  				else
>  					bytes = (size_t)1
> diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
> index 6be13e256c1a..c1b7127f5e61 100644
> --- a/fs/ntfs3/super.c
> +++ b/fs/ntfs3/super.c
> @@ -29,6 +29,7 @@
>  #include <linux/exportfs.h>
>  #include <linux/fs.h>
>  #include <linux/iversion.h>
> +#include <linux/log2.h>
>  #include <linux/module.h>
>  #include <linux/nls.h>
>  #include <linux/parser.h>
> @@ -735,13 +736,13 @@ static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
> 
>  	boot_sector_size = (u32)boot->bytes_per_sector[1] << 8;
>  	if (boot->bytes_per_sector[0] || boot_sector_size < SECTOR_SIZE ||
> -	    !is_power_of2(boot_sector_size)) {
> +	    !is_power_of_2(boot_sector_size)) {
>  		goto out;
>  	}
> 
>  	/* cluster size: 512, 1K, 2K, 4K, ... 2M */
>  	sct_per_clst = true_sectors_per_clst(boot);
> -	if (!is_power_of2(sct_per_clst))
> +	if (!is_power_of_2(sct_per_clst))
>  		goto out;
> 
>  	mlcn = le64_to_cpu(boot->mft_clst);
> @@ -757,14 +758,14 @@ static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
>  	/* Check MFT record size */
>  	if ((boot->record_size < 0 &&
>  	     SECTOR_SIZE > (2U << (-boot->record_size))) ||
> -	    (boot->record_size >= 0 && !is_power_of2(boot->record_size))) {
> +	    (boot->record_size >= 0 && !is_power_of_2(boot->record_size))) {
>  		goto out;
>  	}
> 
>  	/* Check index record size */
>  	if ((boot->index_size < 0 &&
>  	     SECTOR_SIZE > (2U << (-boot->index_size))) ||
> -	    (boot->index_size >= 0 && !is_power_of2(boot->index_size))) {
> +	    (boot->index_size >= 0 && !is_power_of_2(boot->index_size))) {
>  		goto out;
>  	}
> 
> --
> 2.30.2

Hi Kari! Thanks for the patch, applied.

Best regards.