linux-ext4 - Re: [2/6] e2fsprogs: Add CHANNEL_FLAGS_DISCARD_ZEROES flag for io

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Message-ID: <20101123145506.GB32759@thunk.org>
Date:	Tue, 23 Nov 2010 09:55:06 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	sandeen@...hat.com, adilger@...ger.ca, linux-ext4@...r.kernel.org
Subject: Re: [2/6] e2fsprogs: Add CHANNEL_FLAGS_DISCARD_ZEROES flag for
 io_manager

On Thu, Nov 18, 2010 at 03:38:37AM -0000, Lukas Czerner wrote:
> When the device have discard support and simultaneously discard zeroes
> data (and it is properly advertised), then we can take advantage of such
> behavior in several e2fsprogs tools.
> 
> Add new flag CHANNEL_FLAGS_DISCARD_ZEROES for struct_io_channel so
> each io_manager can take advantage of this. The flag is properly set
> according to BLKDISCARDZEROES ioctl in unix_open.
> 
> Also remove old mke2fs_discard_zeroes_data() function and substitute it
> with helper which test this flag.
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>

I merged this patch with a minor change; I renamed
ext2fs_discard_zeroes_data() to io_channel_discard_zeros_data().

								- Ted
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