[lxc-devel] [PATCH] move fnv_64a_buf to utils.c and remove mutliple copies

[Stéphane Graber]

On Thu, Feb 13, 2014 at 04:57:12PM -0500, S.Çağlar Onur wrote:
> Signed-off-by: S.Çağlar Onur <caglar at 10ur.org>

Acked-by: Stéphane Graber <stgraber at ubuntu.com>

> ---
>  src/lxc/conf.c    | 32 --------------------------------
>  src/lxc/monitor.c | 25 -------------------------
>  src/lxc/utils.c   | 26 +++++++++++++++++++++++++-
>  src/lxc/utils.h   |  3 +++
>  4 files changed, 28 insertions(+), 58 deletions(-)
> 
> diff --git a/src/lxc/conf.c b/src/lxc/conf.c
> index 0de189f..4336258 100644
> --- a/src/lxc/conf.c
> +++ b/src/lxc/conf.c
> @@ -1119,38 +1119,6 @@ static int setup_rootfs_pivot_root(const char *rootfs, const char *pivotdir)
>  	return 0;
>  }
>  
> -
> -/*
> - * Note: This is a verbatum copy of what is in monitor.c.  We're just
> - * usint it here to generate a safe subdirectory in /dev/ for the
> - * containers /dev/
> - */
> -
> -/* Note we don't use SHA-1 here as we don't want to depend on HAVE_GNUTLS.
> - * FNV has good anti collision properties and we're not worried
> - * about pre-image resistance or one-way-ness, we're just trying to make
> - * the name unique in the 108 bytes of space we have.
> - */
> -#define FNV1A_64_INIT ((uint64_t)0xcbf29ce484222325ULL)
> -static uint64_t fnv_64a_buf(void *buf, size_t len, uint64_t hval)
> -{
> -	unsigned char *bp;
> -
> -	for(bp = buf; bp < (unsigned char *)buf + len; bp++)
> -	{
> -		/* xor the bottom with the current octet */
> -		hval ^= (uint64_t)*bp;
> -
> -		/* gcc optimised:
> -		 * multiply by the 64 bit FNV magic prime mod 2^64
> -		 */
> -		hval += (hval << 1) + (hval << 4) + (hval << 5) +
> -			(hval << 7) + (hval << 8) + (hval << 40);
> -	}
> -
> -	return hval;
> -}
> -
>  /*
>   * Check to see if a directory has something mounted on it and,
>   * if it does, return the fstype.
> diff --git a/src/lxc/monitor.c b/src/lxc/monitor.c
> index 5e21dc5..ef658f5 100644
> --- a/src/lxc/monitor.c
> +++ b/src/lxc/monitor.c
> @@ -123,31 +123,6 @@ int lxc_monitor_close(int fd)
>  	return close(fd);
>  }
>  
> -/* Note we don't use SHA-1 here as we don't want to depend on HAVE_GNUTLS.
> - * FNV has good anti collision properties and we're not worried
> - * about pre-image resistance or one-way-ness, we're just trying to make
> - * the name unique in the 108 bytes of space we have.
> - */
> -#define FNV1A_64_INIT ((uint64_t)0xcbf29ce484222325ULL)
> -static uint64_t fnv_64a_buf(void *buf, size_t len, uint64_t hval)
> -{
> -	unsigned char *bp;
> -
> -	for(bp = buf; bp < (unsigned char *)buf + len; bp++)
> -	{
> -		/* xor the bottom with the current octet */
> -		hval ^= (uint64_t)*bp;
> -
> -		/* gcc optimised:
> -		 * multiply by the 64 bit FNV magic prime mod 2^64
> -		 */
> -		hval += (hval << 1) + (hval << 4) + (hval << 5) +
> -			(hval << 7) + (hval << 8) + (hval << 40);
> -	}
> -
> -	return hval;
> -}
> -
>  int lxc_monitor_sock_name(const char *lxcpath, struct sockaddr_un *addr) {
>  	size_t len;
>  	int ret;
> diff --git a/src/lxc/utils.c b/src/lxc/utils.c
> index 90401a5..3dff104 100644
> --- a/src/lxc/utils.c
> +++ b/src/lxc/utils.c
> @@ -245,7 +245,7 @@ const char *lxc_global_config_value(const char *option_name)
>  		{ NULL, NULL },
>  	};
>  
> -	/* placed in the thread local storage pool for non-bionic targets */	
> +	/* placed in the thread local storage pool for non-bionic targets */
>  #ifdef HAVE_TLS
>  	static __thread const char *values[sizeof(options) / sizeof(options[0])] = { 0 };
>  #else
> @@ -1151,3 +1151,27 @@ bool dir_exists(const char *path)
>  		return false;
>  	return S_ISDIR(sb.st_mode);
>  }
> +
> +/* Note we don't use SHA-1 here as we don't want to depend on HAVE_GNUTLS.
> + * FNV has good anti collision properties and we're not worried
> + * about pre-image resistance or one-way-ness, we're just trying to make
> + * the name unique in the 108 bytes of space we have.
> + */
> +uint64_t fnv_64a_buf(void *buf, size_t len, uint64_t hval)
> +{
> +	unsigned char *bp;
> +
> +	for(bp = buf; bp < (unsigned char *)buf + len; bp++)
> +	{
> +		/* xor the bottom with the current octet */
> +		hval ^= (uint64_t)*bp;
> +
> +		/* gcc optimised:
> +		 * multiply by the 64 bit FNV magic prime mod 2^64
> +		 */
> +		hval += (hval << 1) + (hval << 4) + (hval << 5) +
> +			(hval << 7) + (hval << 8) + (hval << 40);
> +	}
> +
> +	return hval;
> +}
> diff --git a/src/lxc/utils.h b/src/lxc/utils.h
> index dec6526..887d54c 100644
> --- a/src/lxc/utils.h
> +++ b/src/lxc/utils.h
> @@ -272,4 +272,7 @@ inline static bool am_unpriv(void) {
>  extern uid_t get_ns_uid(uid_t orig);
>  
>  extern bool dir_exists(const char *path);
> +
> +#define FNV1A_64_INIT ((uint64_t)0xcbf29ce484222325ULL)
> +extern inline uint64_t fnv_64a_buf(void *buf, size_t len, uint64_t hval);
>  #endif
> -- 
> 1.8.3.2
> 
> _______________________________________________
> lxc-devel mailing list
> lxc-devel at lists.linuxcontainers.org
> http://lists.linuxcontainers.org/listinfo/lxc-devel

-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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