Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memory pressure

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To: Andrew Morton <akpm@...>

Cc: Christian Borntraeger <borntraeger@...>, <linux-mm@...>, <linux-kernel@...>, Martin Schwidefsky <schwidefsky@...>, Theodore Ts'o <tytso@...>

Subject: Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memory pressure

Date: Monday, October 15, 2007 - 11:23 am

On Monday 15 October 2007 19:16, Andrew Morton wrote:
quoted text> On Tue, 16 Oct 2007 00:06:19 +1000 Nick Piggin <nickpiggin@yahoo.com.au> 
wrote:
quoted text> > On Monday 15 October 2007 18:28, Christian Borntraeger wrote:
> > > Andrew, this is a resend of a bugfix patch. Ramdisk seems a bit
> > > unmaintained, so decided to sent the patch to you :-).
> > > I have CCed Ted, who did work on the code in the 90s. I found no
> > > current email address of Chad Page.
> >
> > This really needs to be fixed...
>
> rd.c is fairly mind-boggling vfs abuse.

Why do you say that? I guess it is _different_, by necessity(?)
Is there anything that is really bad? I guess it's not nice
for operating on the pagecache from its request_fn, but the
alternative is to duplicate pages for backing store and buffer
cache (actually that might not be a bad alternative really).
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Messages in current thread:

[PATCH resend] ramdisk: fix zeroed ramdisk pages on memory p..., Christian Borntraeger, (Mon Oct 15, 4:28 am)

Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Nick Piggin, (Mon Oct 15, 10:06 am)

Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Andrew Morton, (Mon Oct 15, 5:16 am)

Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Nick Piggin, (Mon Oct 15, 11:23 am)

Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Eric W. Biederman, (Mon Oct 15, 11:14 pm)

Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Nick Piggin, (Tue Oct 16, 2:45 am)

Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Eric W. Biederman, (Tue Oct 16, 12:57 am)

Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Nick Piggin, (Tue Oct 16, 4:08 am)

[patch][rfc] rewrite ramdisk, Nick Piggin, (Tue Oct 16, 3:47 am)

Re: [patch][rfc] rewrite ramdisk, Eric W. Biederman, (Wed Oct 17, 6:30 am)

Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Wed Oct 17, 8:49 am)

Re: [patch][rfc] rewrite ramdisk, Eric W. Biederman, (Wed Oct 17, 2:45 pm)

Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Wed Oct 17, 9:06 pm)

Re: [patch][rfc] rewrite ramdisk, Theodore Tso, (Tue Oct 16, 5:28 pm)

Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Tue Oct 16, 6:08 pm)

Re: [patch][rfc] rewrite ramdisk, Eric W. Biederman, (Tue Oct 16, 7:48 pm)

Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Tue Oct 16, 8:28 pm)

Re: [patch][rfc] rewrite ramdisk, Eric W. Biederman, (Tue Oct 16, 9:13 pm)

Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Tue Oct 16, 9:47 pm)

Re: [patch][rfc] rewrite ramdisk, Eric W. Biederman, (Tue Oct 16, 5:08 am)

Re: [patch][rfc] rewrite ramdisk, Jan Engelhardt, (Tue Oct 16, 3:52 am)

Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Tue Oct 16, 4:07 am)

Re: [patch][rfc] rewrite ramdisk, Jan Engelhardt, (Tue Oct 16, 4:17 am)

Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Tue Oct 16, 4:26 am)

Re: [patch][rfc] rewrite ramdisk, Jan Engelhardt, (Tue Oct 16, 4:53 am)

Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Christian Borntraeger, (Mon Oct 15, 5:05 am)

Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Nick Piggin, (Mon Oct 15, 10:38 am)

Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Eric W. Biederman, (Mon Oct 15, 2:38 pm)

Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Eric W. Biederman, (Mon Oct 15, 6:37 pm)

[PATCH] rd: Preserve the dirty bit in init_page_buffers(), Eric W. Biederman, (Mon Oct 15, 6:40 pm)

Re: [PATCH] rd: Preserve the dirty bit in init_page_buffers(), Nick Piggin, (Tue Oct 16, 4:12 am)

Re: [PATCH] rd: Preserve the dirty bit in init_page_buffers(), Eric W. Biederman, (Tue Oct 16, 5:35 am)

[PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Mon Oct 15, 6:42 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Nick Piggin, (Tue Oct 16, 4:19 am)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Tue Oct 16, 3:06 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Nick Piggin, (Tue Oct 16, 6:06 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Christian Borntraeger, (Tue Oct 16, 4:48 am)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Christian Borntraeger, (Tue Oct 16, 3:56 am)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Christian Borntraeger, (Wed Oct 17, 12:14 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Wed Oct 17, 1:57 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Christian Borntraeger, (Wed Oct 17, 5:48 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Wed Oct 17, 6:22 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Christian Borntraeger, (Thu Oct 18, 5:26 am)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Fri Oct 19, 6:46 pm)

[PATCH] rd: Use a private inode for backing storage, Eric W. Biederman, (Fri Oct 19, 6:51 pm)

Re: [PATCH] rd: Use a private inode for backing storage, Nick Piggin, (Sun Oct 21, 12:28 am)

Re: [PATCH] rd: Use a private inode for backing storage, Eric W. Biederman, (Sun Oct 21, 1:10 am)

Re: [PATCH] rd: Use a private inode for backing storage, Nick Piggin, (Sun Oct 21, 1:24 am)

Re: [PATCH] rd: Use a private inode for backing storage, Eric W. Biederman, (Sun Oct 21, 2:48 am)

Re: [PATCH] rd: Use a private inode for backing storage, Nick Piggin, (Sun Oct 21, 5:39 am)

Re: [PATCH] rd: Use a private inode for backing storage, Eric W. Biederman, (Sun Oct 21, 1:56 pm)

Re: [PATCH] rd: Use a private inode for backing storage, Nick Piggin, (Sun Oct 21, 8:29 pm)

Re: [PATCH] rd: Use a private inode for backing storage, Christian Borntraeger, (Sun Oct 21, 3:28 am)

Re: [PATCH] rd: Use a private inode for backing storage, Eric W. Biederman, (Sun Oct 21, 4:23 am)

Re: [PATCH] rd: Use a private inode for backing storage, Nick Piggin, (Sun Oct 21, 5:56 am)

Re: [PATCH] rd: Use a private inode for backing storage, Eric W. Biederman, (Sun Oct 21, 2:39 pm)

Re: [PATCH] rd: Use a private inode for backing storage, Chris Mason, (Mon Oct 22, 9:11 am)

Re: [PATCH] rd: Use a private inode for backing storage, Nick Piggin, (Sun Oct 21, 9:56 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Chris Mason, (Wed Oct 17, 3:14 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Wed Oct 17, 4:29 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Chris Mason, (Wed Oct 17, 4:54 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Wed Oct 17, 5:30 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Chris Mason, (Wed Oct 17, 6:58 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Wed Oct 17, 7:28 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Chris Mason, (Wed Oct 17, 8:03 pm)

[RFC][PATCH] block: Isolate the buffer cache in it's own map..., Eric W. Biederman, (Wed Oct 17, 11:59 pm)

Re: [RFC][PATCH] block: Isolate the buffer cache in it's own..., Nick Piggin, (Thu Oct 18, 1:10 am)

Re: [RFC][PATCH] block: Isolate the buffer cache in it's own..., Eric W. Biederman, (Fri Oct 19, 5:35 pm)

Re: [RFC][PATCH] block: Isolate the buffer cache in it's own..., Andrew Morton, (Thu Oct 18, 12:32 am)

Re: [RFC][PATCH] block: Isolate the buffer cache in it's own..., Eric W. Biederman, (Fri Oct 19, 5:27 pm)

Re: [RFC][PATCH] block: Isolate the buffer cache in it's own..., Nick Piggin, (Sun Oct 21, 12:24 am)

Re: [RFC][PATCH] block: Isolate the buffer cache in it's own..., David Chinner, (Sun Oct 21, 8:15 pm)

Re: [RFC][PATCH] block: Isolate the buffer cache in it's own..., Eric W. Biederman, (Sun Oct 21, 12:53 am)

Re: [RFC][PATCH] block: Isolate the buffer cache in it's own..., Nick Piggin, (Sun Oct 21, 1:36 am)

Re: [RFC][PATCH] block: Isolate the buffer cache in it's own..., Eric W. Biederman, (Sun Oct 21, 3:09 am)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Wed Oct 17, 11:27 pm)

Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Tue Oct 16, 5:22 am)

Re: Re: [PATCH] rd: Mark ramdisk buffers heads dirty, , (Tue Oct 16, 4:05 am)

Re: Re: [PATCH] rd: Mark ramdisk buffers heads dirty, , (Tue Oct 16, 4:13 am)

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