From: Nick Piggin <npiggin@suse.de>
To: Andi Kleen <andi@firstfloor.org>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, fengguang.wu@intel.com,
hidehiro.kawai.ez@hitachi.com
Subject: Re: [PATCH] [11/19] HWPOISON: Refactor truncate to allow direct truncating of page v2
Date: Wed, 5 Aug 2009 16:01:45 +0200 [thread overview]
Message-ID: <20090805140145.GB28563@wotan.suse.de> (raw)
In-Reply-To: <20090805134607.GH11385@basil.fritz.box>
On Wed, Aug 05, 2009 at 03:46:08PM +0200, Andi Kleen wrote:
> On Wed, Aug 05, 2009 at 12:20:08PM +0200, Nick Piggin wrote:
> > > truncate_complete_page(struct address_space *mapping, struct page *page)
> > > {
> > > if (page->mapping != mapping)
> > > - return;
> > > + return -EIO;
> >
> > Hmm, at this point, the page must have been removed from pagecache,
> > so I don't know if you need to pass an error back?
>
> It could be reused, which would be bad for us?
I haven't brought up the caller at this point, but IIRC you had
the page locked and mapping confirmed at this point anyway so
it would never be an error for your code.
Probably it would be nice to just force callers to verify the page.
Normally IMO it is much nicer and clearer to do it at the time the
page gets locked, unless there is good reason otherwise.
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next prev parent reply other threads:[~2009-08-05 14:01 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-05 9:36 [PATCH] [0/19] HWPOISON: Intro Andi Kleen
2009-08-05 9:36 ` [PATCH] [1/19] HWPOISON: Add page flag for poisoned pages Andi Kleen
2009-08-05 9:36 ` [PATCH] [2/19] HWPOISON: Export some rmap vma locking to outside world Andi Kleen
2009-08-05 9:36 ` [PATCH] [3/19] HWPOISON: Add support for poison swap entries v2 Andi Kleen
2009-08-05 9:36 ` [PATCH] [4/19] HWPOISON: Add new SIGBUS error codes for hardware poison signals Andi Kleen
2009-08-05 9:36 ` [PATCH] [5/19] HWPOISON: Add basic support for poisoned pages in fault handler v3 Andi Kleen
2009-08-05 9:36 ` [PATCH] [6/19] HWPOISON: Add various poison checks in mm/memory.c v2 Andi Kleen
2009-08-05 9:36 ` [PATCH] [7/19] HWPOISON: x86: Add VM_FAULT_HWPOISON handling to x86 page fault handler v2 Andi Kleen
2009-08-05 9:36 ` [PATCH] [8/19] HWPOISON: Use bitmask/action code for try_to_unmap behaviour Andi Kleen
2009-08-05 9:36 ` [PATCH] [9/19] HWPOISON: Handle hardware poisoned pages in try_to_unmap Andi Kleen
2009-08-05 9:36 ` [PATCH] [10/19] HWPOISON: check and isolate corrupted free pages v2 Andi Kleen
2009-08-05 9:36 ` [PATCH] [11/19] HWPOISON: Refactor truncate to allow direct truncating of page v2 Andi Kleen
2009-08-05 10:20 ` Nick Piggin
2009-08-05 12:37 ` Wu Fengguang
2009-08-05 13:46 ` Andi Kleen
2009-08-05 14:01 ` Nick Piggin [this message]
2009-08-05 14:10 ` Andi Kleen
2009-08-05 14:16 ` Nick Piggin
2009-08-05 14:41 ` Andi Kleen
2009-08-05 14:44 ` Nick Piggin
2009-08-05 15:00 ` Matthew Wilcox
2009-08-06 11:48 ` Martin Schwidefsky
2009-08-06 12:04 ` Andi Kleen
2009-08-05 15:12 ` Wu Fengguang
2009-08-05 9:36 ` [PATCH] [12/19] HWPOISON: Add invalidate_inode_page Andi Kleen
2009-08-05 9:36 ` [PATCH] [13/19] HWPOISON: Define a new error_remove_page address space op for async truncation Andi Kleen
2009-08-05 9:36 ` [PATCH] [14/19] HWPOISON: Add PR_MCE_KILL prctl to control early kill behaviour per process Andi Kleen
2009-08-05 9:36 ` [PATCH] [15/19] HWPOISON: The high level memory error handler in the VM v7 Andi Kleen
2009-08-05 9:36 ` [PATCH] [16/19] HWPOISON: Enable .remove_error_page for migration aware file systems Andi Kleen
2009-08-05 11:12 ` Christoph Hellwig
2009-08-05 11:52 ` Wu Fengguang
2009-08-05 13:50 ` Andi Kleen
2009-08-10 6:36 ` Hidehiro Kawai
2009-08-10 7:07 ` Wu Fengguang
2009-08-11 3:48 ` Hidehiro Kawai
2009-08-11 6:59 ` Andi Kleen
2009-08-11 12:38 ` Wu Fengguang
2009-08-10 7:44 ` Andi Kleen
2009-08-11 3:50 ` Hidehiro Kawai
2009-08-11 7:17 ` Andi Kleen
2009-08-12 2:49 ` Hidehiro Kawai
2009-08-12 7:46 ` Andi Kleen
2009-08-12 9:52 ` Hidehiro Kawai
2009-08-12 10:16 ` Andi Kleen
2009-08-12 8:05 ` Nick Piggin
2009-08-12 8:23 ` Andi Kleen
2009-08-12 8:46 ` Nick Piggin
2009-08-12 8:57 ` Andi Kleen
2009-08-12 9:05 ` Nick Piggin
2009-08-12 9:39 ` Wu Fengguang
2009-08-05 9:36 ` [PATCH] [17/19] HWPOISON: Enable error_remove_page for NFS Andi Kleen
2009-08-05 9:36 ` [PATCH] [18/19] HWPOISON: Add madvise() based injector for hardware poisoned pages v3 Andi Kleen
2009-08-05 9:36 ` [PATCH] [19/19] HWPOISON: Add simple debugfs interface to inject hwpoison on arbitary PFNs Andi Kleen
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