linux-ext4 - Re: [RFC][PATCH 1/11][take 2] add new mkfs option to create ext4 filesystems

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <467FD71A.7030003@linux.vnet.ibm.com>
Date:	Mon, 25 Jun 2007 20:24:18 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Valerie Clement <valerie.clement@...l.net>
CC:	Theodore Tso <tytso@....edu>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [RFC][PATCH 1/11][take 2] add new mkfs option to create ext4
 filesystems



Valerie Clement wrote:
> This patch adds a new option '-D' to mkfs to allow creating ext4 
> filesystem.
> 
>  lib/ext2fs/ext2_fs.h    |    7 +++++++
>  lib/ext2fs/initialize.c |    1 +
>  misc/mke2fs.c           |   18 ++++++++++++++++--
>  3 files changed, 24 insertions(+), 2 deletions(-)
> 
> 
> 
> 
> 
> ------------------------------------------------------------------------
> 
> Index: e2fsprogs-1.39-tyt3-v7/misc/mke2fs.c
> ===================================================================
> --- e2fsprogs-1.39-tyt3-v7.orig/misc/mke2fs.c	2007-04-30 07:10:05.000000000 +0200
> +++ e2fsprogs-1.39-tyt3-v7/misc/mke2fs.c	2007-06-14 12:03:48.000000000 +0200
> @@ -96,7 +96,7 @@ static void usage(void)
>  {
>  	fprintf(stderr, _("Usage: %s [-c|-t|-l filename] [-b block-size] "
>  	"[-f fragment-size]\n\t[-i bytes-per-inode] [-I inode-size] "
> -	"[-j] [-J journal-options]\n"
> +	"[-D descriptor-size] [-j] [-J journal-options]\n"
>  	"\t[-N number-of-inodes] [-m reserved-blocks-percentage] "
>  	"[-o creator-os]\n\t[-g blocks-per-group] [-L volume-label] "
>  	"[-M last-mounted-directory]\n\t[-O feature[,...]] "
> @@ -899,6 +899,7 @@ static void PRS(int argc, char *argv[])
>  	int		blocksize = 0;
>  	int		inode_ratio = 0;
>  	int		inode_size = 0;
> +	int		desc_size = 0;
>  	double		reserved_ratio = 5.0;
>  	int		sector_size = 0;
>  	int		show_version_only = 0;
> @@ -977,7 +978,7 @@ static void PRS(int argc, char *argv[])
>  	}
> 
>  	while ((c = getopt (argc, argv,
> -		    "b:cf:g:i:jl:m:no:qr:s:tvE:FI:J:L:M:N:O:R:ST:V")) != EOF) {
> +		    "b:cf:g:i:jl:m:no:qr:s:tvD:E:FI:J:L:M:N:O:R:ST:V")) != EOF) {
>  		switch (c) {
>  		case 'b':
>  			blocksize = strtol(optarg, &tmp, 0);
> @@ -1094,6 +1095,14 @@ static void PRS(int argc, char *argv[])
>  				exit(1);
>  			}
>  			break;
> +		case 'D':
> +			desc_size = strtoul(optarg, &tmp, 0);
> +			if (*tmp) {
> +				com_err(program_name, 0,
> +					_("invalid descriptor size - %s"), optarg);
> +				exit(1);
> +			}
> +			break;
>  		case 'v':
>  			verbose = 1;
>  			break;
> @@ -1422,6 +1431,11 @@ static void PRS(int argc, char *argv[])
>  		}
>  	}
> 
> +	if (desc_size >= EXT2_MIN_DESC_SIZE_64BIT) {
> +		fs_param.s_feature_incompat |= EXT4_FEATURE_INCOMPAT_64BIT;
> +		fs_param.s_desc_size = EXT2_MIN_DESC_SIZE_64BIT;
> +	}
> +
>  	if (!force && fs_param.s_blocks_count >= ((unsigned) 1 << 31)) {
>

Why would one need variable descriptor size. Right now we have only two descriptor sizes right (32 and 64 ).  Can't we figure out
the descriptor size we should use by looking at the partition size ? What is that i am missing ?. 

-aneesh
-
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html