linux-ext4 - Re: [PATCH] resize2fs: handle exactly-16T filesystems in resize2fs

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Date:	Thu, 16 Dec 2010 08:57:09 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Lukas Czerner <lczerner@...hat.com>
CC:	Theodore Tso <tytso@....edu>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] resize2fs: handle exactly-16T filesystems in resize2fs

On 12/16/10 3:00 AM, Lukas Czerner wrote:
> On Wed, 15 Dec 2010, Eric Sandeen wrote:
> 
>> Before we go whole-hog on 64-bit e2fsprogs, I wonder if this
>> is worth considering as a last-minute addition to the 1.41
>> stream.  Currently, mke2fs will shave a block off an exactly-16T
>> device to fit*, but resize2fs does not do the same, leading
>> to some asymmetry.  This patch fixes that up, and allows 16T
>> devices to be handled more gracefully in offline resize.
>> (in fact resize2fs will not even open a 16T device, today).
>>
>> *commit 37d17a65ecb4615546b417038190a41bafca7c51
>>
>> Signed-off-by: Eric Sandeen <sandeen@...hat.com>
> 
> Hi Eric,
> 
> which version of e2fsprogs are you referring to ? When I look at master
> branch I can see than those changes are already in there. Except the check
> if the new size is too large. Am I missing something ?

Hm I may have gotten lost in branches.  I was looking at 1.41.12...
I didn't think 64-bit work had been merged there yet.
I'm not sure what ted is basing 1.41.XX off of...

-Eric

> -Lukas
> 
>> ---
>>
>> Index: e2fsprogs-1.41.12/resize/main.c
>> ===================================================================
>> --- e2fsprogs-1.41.12.orig/resize/main.c
>> +++ e2fsprogs-1.41.12/resize/main.c
>> @@ -159,7 +159,7 @@ int main (int argc, char ** argv)
>>  	int		print_min_size = 0;
>>  	int		fd, ret;
>>  	blk_t		new_size = 0;
>> -	blk_t		max_size = 0;
>> +	blk64_t		max_size = 0;
>>  	blk_t		min_size = 0;
>>  	io_manager	io_ptr;
>>  	char		*new_size_str = 0;
>> @@ -375,7 +375,7 @@ int main (int argc, char ** argv)
>>  	 * defaults and for making sure the new filesystem doesn't
>>  	 * exceed the partition size.
>>  	 */
>> -	retval = ext2fs_get_device_size(device_name, fs->blocksize,
>> +	retval = ext2fs_get_device_size2(device_name, fs->blocksize,
>>  					&max_size);
>>  	if (retval) {
>>  		com_err(program_name, retval,
>> @@ -393,6 +393,14 @@ int main (int argc, char ** argv)
>>  			exit(1);
>>  		}
>>  	} else {
>> +		/* Take down devices exactly 16T to 2^32-1 blocks */
>> +		if (max_size == (1ULL << 32))
>> +			max_size--;
>> +		else if (max_size > (1ULL << 32)) {
>> +			com_err(program_name, 0, _("New size too large to be "
>> +				"expressed in 32 bits\n"));
>> +			exit(1);
>> +		}
>>  		new_size = max_size;
>>  		/* Round down to an even multiple of a pagesize */
>>  		if (sys_page_size > fs->blocksize)
>> @@ -432,7 +441,7 @@ int main (int argc, char ** argv)
>>  	}
>>  	if (!force && (new_size > max_size)) {
>>  		fprintf(stderr, _("The containing partition (or device)"
>> -			" is only %u (%dk) blocks.\nYou requested a new size"
>> +			" is only %llu (%dk) blocks.\nYou requested a new size"
>>  			" of %u blocks.\n\n"), max_size,
>>  			fs->blocksize / 1024, new_size);
>>  		exit(1);
>> --
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>>
> 

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