linux-ext4 - [PATCH 0/6 v2] e2fsprogs: Using discard in e2fsprogs tools

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Date:	Thu, 18 Nov 2010 14:38:35 +0100
From:	Lukas Czerner <lczerner@...hat.com>
To:	tytso@....edu
Cc:	sandeen@...hat.com, adilger@...ger.ca, lczerner@...hat.com,
	linux-ext4@...r.kernel.org
Subject: [PATCH 0/6 v2] e2fsprogs: Using discard in e2fsprogs tools

Hi all,

We have came to consensus about using discard in e2fsprogs tools. These
patches generalize use of discard in e2fsprogs tools introduce changes
in mke2fs and e2fsck.

Short summary
-------------

 [PATCH 1/6] e2fsprogs: Add discard function into struct_io_manager
   * generalize use of discard in e2fsprogs and let any tool in e2fsprogs
     take advantage of it withou need to write its own BLKDISCARD wrappers.

 [PATCH 2/6] e2fsprogs: Add CHANNEL_FLAGS_DISCARD_ZEROES flag for io_manager
   * Give the opportunity for any io_manager to check if device discard
     support zeroes data and save the results into io_channel for use in
     any e2fsprofs tool.

 [PATCH 3/6] e2fsck: Discard free data and inode blocks.
   * In pass 5 after the group descriptors has been changed discard free
     data and inode blocks. The consensus was that it should be OFF by
     default, so it is.
   * Introduce new paid of extended options discard/nodiscard.

 [PATCH 4/6] mke2fs: Deprecate -K option, introduce discard/nodiscard
   * To the same of consistency and to gain ability to easily default it
     the new pair of extended options has been added.
   * The consensus was that it should stay ON by default, so it is.

 [PATCH 5/6] mke2fs: Use unix_discard() for discards

 [PATCH 6/6] mke2fs: Add discard option into mke2fs.conf

Any comments appreciated!

Thanks!

-Lukas

---
[PATCH 1/6] e2fsprogs: Add discard function into struct_io_manager
[PATCH 2/6] e2fsprogs: Add CHANNEL_FLAGS_DISCARD_ZEROES flag for io_manager
[PATCH 3/6] e2fsck: Discard free data and inode blocks.
[PATCH 4/6] mke2fs: Deprecate -K option, introduce discard/nodiscard
[PATCH 5/6] mke2fs: Use unix_discard() for discards
[PATCH 6/6] mke2fs: Add discard option into mke2fs.conf

 e2fsck/e2fsck.8.in    |   14 +++++++
 e2fsck/e2fsck.h       |    1 +
 e2fsck/pass5.c        |   96 ++++++++++++++++++++++++++++++++++++++++++++++++
 e2fsck/unix.c         |   10 ++++-
 lib/ext2fs/ext2_io.h  |    5 ++
 lib/ext2fs/unix_io.c  |   45 ++++++++++++++++++++++-
 misc/mke2fs.8.in      |   18 +++++---
 misc/mke2fs.c         |   98 ++++++++++++++-----------------------------------
 misc/mke2fs.conf.5.in |    5 ++
 9 files changed, 213 insertions(+), 79 deletions(-)

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