linux-kernel - Re: [PATCH] mm/memory: print also a_ops->readpage in print_bad

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Date:	Fri, 3 Apr 2015 15:10:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:	linux-mm@...ck.org, Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/memory: print also a_ops->readpage in print_bad_pte

On Fri, 03 Apr 2015 20:18:18 +0300 Konstantin Khlebnikov <khlebnikov@...dex-team.ru> wrote:

> A lot of filesystems use generic_file_mmap() and filemap_fault(),
> f_op->mmap and vm_ops->fault aren't enough to identify filesystem.
> 
> This prints file name, vm_ops->fault, f_op->mmap and a_ops->readpage
> (which is almost always implemented and filesystem-specific).
> 
> Example:
> 
> [   23.676410] BUG: Bad page map in process sh  pte:1b7e6025 pmd:19bbd067
> [   23.676887] page:ffffea00006df980 count:4 mapcount:1 mapping:ffff8800196426c0 index:0x97
> [   23.677481] flags: 0x10000000000000c(referenced|uptodate)
> [   23.677896] page dumped because: bad pte
> [   23.678205] addr:00007f52fcb17000 vm_flags:00000075 anon_vma:          (null) mapping:ffff8800196426c0 index:97
> [   23.678922] file:libc-2.19.so fault:filemap_fault mmap:generic_file_readonly_mmap readpage:v9fs_vfs_readpage

Is that why we print these out?  Just to identify the fs type?

There's always vma->vm_file->f_inode->i_sb->s_magic ;)


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