Re: [PATCH 31/32] xfs: only allocate the buffer size actually needed in __xfs_set_acl

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On Wed, Feb 26, 2020 at 12:23:05PM -0800, Christoph Hellwig wrote:
> No need to allocate the max size if we can just allocate the easily
> known actual ACL size.
> 
> Suggested-by: Dave Chinner <dchinner@xxxxxxxxxx>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Looks reasonable,
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>

--D

> ---
>  fs/xfs/xfs_acl.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
> index 552258399648..5807f11aed3e 100644
> --- a/fs/xfs/xfs_acl.c
> +++ b/fs/xfs/xfs_acl.c
> @@ -187,16 +187,11 @@ __xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
>  	args.namelen = strlen(args.name);
>  
>  	if (acl) {
> -		args.valuelen = XFS_ACL_MAX_SIZE(ip->i_mount);
> +		args.valuelen = XFS_ACL_SIZE(acl->a_count);
>  		args.value = kmem_zalloc_large(args.valuelen, 0);
>  		if (!args.value)
>  			return -ENOMEM;
> -
>  		xfs_acl_to_disk(args.value, acl);
> -
> -		/* subtract away the unused acl entries */
> -		args.valuelen -= sizeof(struct xfs_acl_entry) *
> -			 (XFS_ACL_MAX_ENTRIES(ip->i_mount) - acl->a_count);
>  	}
>  
>  	error = xfs_attr_set(&args);
> -- 
> 2.24.1
> 



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