linux-kernel - Re: [PATCH v2 4/6] ext4: allocate extended attribute value in vmalloc area

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Date:   Wed, 7 Dec 2022 11:58:19 +0100
From:   Jan Kara <jack@...e.cz>
To:     Ye Bin <yebin@...weicloud.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        jack@...e.cz, Ye Bin <yebin10@...wei.com>
Subject: Re: [PATCH v2 4/6] ext4: allocate extended attribute value in
 vmalloc area

On Wed 07-12-22 15:40:41, Ye Bin wrote:
> From: Ye Bin <yebin10@...wei.com>
> 
> Now, extended attribute value maxium length is 64K. The memory requested here
> does not need continuous physical addresses, so it is appropriate to use
> kvmalloc to request memory. At the same time, it can also cope with the
> situation that the extended attribute will become longer in the future.
> 
> Signed-off-by: Ye Bin <yebin10@...wei.com>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

Thanks!

								Honza

> ---
>  fs/ext4/xattr.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
> index 75287422c36c..efa623658c12 100644
> --- a/fs/ext4/xattr.c
> +++ b/fs/ext4/xattr.c
> @@ -2579,7 +2579,7 @@ static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode,
>  
>  	is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS);
>  	bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS);
> -	buffer = kmalloc(value_size, GFP_NOFS);
> +	buffer = kvmalloc(value_size, GFP_NOFS);
>  	b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS);
>  	if (!is || !bs || !buffer || !b_entry_name) {
>  		error = -ENOMEM;
> @@ -2631,7 +2631,7 @@ static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode,
>  	error = 0;
>  out:
>  	kfree(b_entry_name);
> -	kfree(buffer);
> +	kvfree(buffer);
>  	if (is)
>  		brelse(is->iloc.bh);
>  	if (bs)
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR