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From: "Jörn Engel" <joern@wohnheim.fh-wedel.de>
To: "Eric W. Biederman" <ebiederman@lnxi.com>
Cc: Christopher Hoover <ch@murgatroid.com>,
	'Linux MTD' <linux-mtd@lists.infradead.org>
Subject: Re: [PATCH 13/22] remove erase regions
Date: Wed, 22 Dec 2004 11:41:37 +0100	[thread overview]
Message-ID: <20041222104137.GD31282@wohnheim.fh-wedel.de> (raw)
In-Reply-To: <m3y8fqtzql.fsf@maxwell.lnxi.com>

On Wed, 22 December 2004 03:05:06 -0700, Eric W. Biederman wrote:
> 
> On a 4KiB flash I could probably afford to not use a spare flash block
> or two.   For the common case of 64KiB I don't see how I could leave
> an entire flash block unused.  Which is the very hard part of scaling
> jffs2 down to the tiniest systems.

Yup.  One block (plus a few bytes) is the lower bound.  Below that,
you can read-modify-erase-update and hope the power won't fail before
you're done.  Not fun.

> block2mtd ?

Deal.

> I see more problems with where the code wanted to go, as indicated
> by those comments than with where the code is now.  Probably
> allocating a single buffer page and calling down into the mtd device
> layer multiple times.  I have trouble seeing the benefit
> of making it a zero copy interface.
> 
> But none of this counts as horribly ugly in my book.  Just
> warts that may benefit from being cleaned up.
> 
> Some of the current IB stacks count get a lot closer to horribly ugly.
> Several hundred lines of global variables in one file I count horribly
> ugly.  At 500 lines I can see ugly code, but it is hard to write
> something that is a disaster that is that small.  The obfuscated C
> contest shows you can do it but we certainly don't have that.

Agreed.  Just ugly then.

> So have your fun with block2mtd and I won't worry about it.

;)

Jörn

-- 
Those who come seeking peace without a treaty are plotting.
-- Sun Tzu

  reply	other threads:[~2004-12-22 10:41 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-12-15 23:19 JFFS2 mount time Gareth Bult (Encryptec)
2004-12-16  0:15 ` Josh Boyer
2004-12-16  1:02   ` Gareth Bult (Encryptec)
2004-12-16 12:53     ` Josh Boyer
2004-12-16 21:22       ` Gareth Bult (Encryptec)
2004-12-16 21:28         ` Josh Boyer
2004-12-16 21:47           ` Gareth Bult (Encryptec)
2004-12-17 12:54             ` Josh Boyer
2004-12-17 15:33               ` Gareth Bult (Encryptec)
2004-12-17 16:02                 ` Josh Boyer
2004-12-17 16:46                   ` Gareth Bult (Encryptec)
2004-12-17 17:08                     ` Artem B. Bityuckiy
2004-12-17 17:10                     ` Josh Boyer
2004-12-17 17:26                       ` Gareth Bult (Encryptec)
2004-12-17 17:35                         ` Josh Boyer
2004-12-17 18:09                           ` Gareth Bult (Encryptec)
2004-12-17 19:14                             ` jasmine
2004-12-17 20:55                               ` Gareth Bult (Encryptec)
2004-12-18 16:02                           ` Jörn Engel
2004-12-20 16:34                             ` Josh Boyer
2004-12-20 17:12                               ` Gareth Bult (Encryptec)
2004-12-21 13:09                                 ` Jörn Engel
2004-12-21 13:24                                   ` Gareth Bult (Encryptec)
2004-12-21 13:34                                     ` Jörn Engel
2004-12-18 16:19             ` Jörn Engel
2004-12-18 17:32               ` Gareth Bult (Encryptec)
2004-12-18 17:52                 ` Jörn Engel
2004-12-18 18:11                   ` Jörn Engel
2004-12-18 20:48                     ` Gareth Bult (Encryptec)
2004-12-19  2:44                       ` Jörn Engel
2004-12-21 13:30                       ` Jörn Engel
2004-12-21 13:39                         ` [PATCH 1/22] Add drivers/mtd/devices/blockmtd.c Jörn Engel
2004-12-21 13:41                           ` [PATCH 2/22] Add copyrights Jörn Engel
2004-12-21 13:42                             ` [PATCH 3/22] Remove read-only option Jörn Engel
2004-12-21 13:44                               ` [PATCH 4/22] Change init/exit functions Jörn Engel
2004-12-21 13:45                                 ` [PATCH 5/22] Remove gcc warnings Jörn Engel
2004-12-21 13:47                                   ` [PATCH 6/22] Remove debug macros Jörn Engel
2004-12-21 13:48                                     ` [PATCH 7/22] Lindent Jörn Engel
2004-12-21 13:49                                       ` [PATCH 8/22] Remove sync interface Jörn Engel
2004-12-21 13:51                                         ` [PATCH 9/22] Change parameter interface to phram-style Jörn Engel
2004-12-21 13:53                                           ` [PATCH 10/22] Cleanup macro usage Jörn Engel
2004-12-21 13:54                                             ` [PATCH 11/22] kfree simplifications Jörn Engel
2004-12-21 13:55                                               ` [PATCH 12/22] change blockmtd_sync Jörn Engel
2004-12-21 13:57                                                 ` [PATCH 13/22] remove erase regions Jörn Engel
2004-12-21 14:01                                                   ` [PATCH 14/22] Change add_device Jörn Engel
2004-12-21 14:02                                                     ` [PATCH 15/22] Rename unreadable mutex Jörn Engel
2004-12-21 14:03                                                       ` [PATCH 16/22] list changes Jörn Engel
2004-12-21 14:04                                                         ` [PATCH 17/22] Rename central struct Jörn Engel
2004-12-21 14:06                                                           ` [PATCH 18/22] Function renaming Jörn Engel
2004-12-21 14:09                                                             ` [PATCH 19/22] Fold various erase functions Jörn Engel
2004-12-21 14:10                                                               ` [PATCH 20/22] Fold various write functions Jörn Engel
2004-12-21 14:11                                                                 ` [PATCH 21/22] Default erase size Jörn Engel
2004-12-21 14:13                                                                   ` [PATCH 22/22] Readahead Jörn Engel
2004-12-21 18:42                                                   ` [PATCH 13/22] remove erase regions Christopher Hoover
2004-12-21 18:49                                                     ` Jörn Engel
2004-12-21 21:09                                                       ` Christopher Hoover
2004-12-22  2:47                                                         ` Eric W. Biederman
2004-12-22  8:59                                                           ` Jörn Engel
2004-12-22 10:05                                                             ` Eric W. Biederman
2004-12-22 10:41                                                               ` Jörn Engel [this message]
2004-12-21 13:42                           ` [PATCH 1/22] Add drivers/mtd/devices/blockmtd.c Gareth Bult (Encryptec)
2004-12-21 14:15                             ` Jörn Engel
2004-12-21 13:40                         ` JFFS2 mount time Gareth Bult (Encryptec)
2004-12-21 15:00                           ` David Woodhouse
     [not found]                             ` <1103644945.10792.175.camel@squizzey.bult.co.uk>
2004-12-21 16:04                               ` Jörn Engel
2004-12-16 13:43 ` Ferenc Havasi
2004-12-20 16:01   ` Gareth Bult (Encryptec)
2004-12-20 16:09     ` Ferenc Havasi
2004-12-20 16:39       ` Gareth Bult (Encryptec)
2004-12-20 17:48       ` Gareth Bult (Encryptec)

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