From: Al Viro <viro@ZenIV.linux.org.uk>
To: Tomeu Vizoso <tomeu@tomeuvizoso.net>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Neil Brown <neilb@suse.com>,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v2 06/11] don't put symlink bodies in pagecache into highmem
Date: Thu, 14 Jan 2016 15:25:53 +0000 [thread overview]
Message-ID: <20160114152553.GW17997@ZenIV.linux.org.uk> (raw)
In-Reply-To: <CAAObsKD3K5fL=nyW41C8rEe60Y8qGaamtLiukv8J9HT3UKSybg@mail.gmail.com>
On Thu, Jan 14, 2016 at 02:22:51PM +0100, Tomeu Vizoso wrote:
> On 9 December 2015 at 06:34, Al Viro <viro@zeniv.linux.org.uk> wrote:
> > From: Al Viro <viro@zeniv.linux.org.uk>
> >
> > kmap() in page_follow_link_light() needed to go - allowing to hold
> > an arbitrary number of kmaps for long is a great way to deadlocking
> > the system.
> >
> > new helper (inode_nohighmem(inode)) needs to be used for pagecache
> > symlinks inodes; done for all in-tree cases. page_follow_link_light()
> > instrumented to yell about anything missed.
>
> Hi, starting with with this change, I get this oops when installing
> packages into a rootfs in NFS:
Lovely... So you somehow getting a highmem page out
page = read_cache_page(&inode->i_data, 0,
(filler_t *)nfs_symlink_filler, inode);
if (IS_ERR(page))
return ERR_CAST(page);
and that - after
inode_nohighmem(inode);
(otherwise you wouldn't get nfs_symlink_inode_operations on that inode).
Could you add
printk(KERN_ERR "i_data = %p, i_mapping = %p, flags: %lx\n",
&inode->i_data,
inode->i_mapping,
(unsigned long)inode->i_data.flags);
right before the return from nfs_get_link() and see what it prints?
next prev parent reply other threads:[~2016-01-14 15:25 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-17 22:57 [PATCHSET] ->follow_link() without dropping from RCU mode Al Viro
2015-11-17 23:00 ` [PATCH 01/10] switch befs long symlinks to page_symlink_operations Al Viro
2015-11-17 23:00 ` [PATCH 02/10] logfs: don't duplicate page_symlink_inode_operations Al Viro
2015-11-17 23:00 ` [PATCH 03/10] udf: " Al Viro
2015-11-17 23:00 ` [PATCH 04/10] ufs: get rid of ->setattr() for symlinks Al Viro
2015-11-17 23:00 ` [PATCH 05/10] namei: page_getlink() and page_follow_link_light() are the same thing Al Viro
2015-11-17 23:00 ` [PATCH 06/10] [vfs] don't put symlink bodies in pagecache into highmem Al Viro
2015-11-19 23:02 ` Dave Chinner
2015-11-17 23:00 ` [PATCH 07/10] [vfs] replace ->follow_link() with new method that could stay in RCU mode Al Viro
2015-11-17 23:00 ` [PATCH 08/10] teach page_get_link() to work " Al Viro
2015-11-17 23:00 ` [PATCH 09/10] teach shmem_get_link() " Al Viro
2015-11-17 23:00 ` [PATCH 10/10] teach proc_self_get_link()/proc_thread_self_get_link() " Al Viro
2015-12-09 5:32 ` [PATCHSET v2] ->follow_link() without dropping from " Al Viro
2015-12-09 5:34 ` [PATCH v2 01/11] switch befs long symlinks to page_symlink_operations Al Viro
2015-12-09 5:34 ` [PATCH v2 02/11] logfs: don't duplicate page_symlink_inode_operations Al Viro
2015-12-09 5:34 ` [PATCH v2 03/11] udf: " Al Viro
2015-12-09 5:34 ` [PATCH v2 04/11] ufs: get rid of ->setattr() for symlinks Al Viro
2015-12-09 5:34 ` [PATCH v2 05/11] namei: page_getlink() and page_follow_link_light() are the same thing Al Viro
2015-12-09 5:34 ` [PATCH v2 06/11] don't put symlink bodies in pagecache into highmem Al Viro
2016-01-14 13:22 ` Tomeu Vizoso
2016-01-14 15:25 ` Al Viro [this message]
2016-01-14 15:58 ` Tomeu Vizoso
2016-01-14 16:23 ` Al Viro
2016-01-14 16:57 ` Tomeu Vizoso
2016-01-14 17:13 ` Al Viro
2016-01-14 19:15 ` Tomeu Vizoso
2016-01-14 21:02 ` Al Viro
2016-01-14 21:40 ` Linus Torvalds
2016-01-14 22:25 ` Al Viro
2016-01-14 23:33 ` Al Viro
2016-01-14 23:58 ` Linus Torvalds
2016-01-15 0:05 ` Al Viro
2015-12-09 5:34 ` [PATCH v2 07/11] replace ->follow_link() with new method that could stay in RCU mode Al Viro
2015-12-09 5:34 ` [PATCH v2 08/11] teach page_get_link() to work " Al Viro
2015-12-09 5:34 ` [PATCH v2 09/11] teach shmem_get_link() " Al Viro
2015-12-09 5:34 ` [PATCH v2 10/11] teach proc_self_get_link()/proc_thread_self_get_link() " Al Viro
2015-12-09 5:34 ` [PATCH v2 11/11] teach nfs_get_link() " Al Viro
2015-12-09 17:24 ` [PATCHSET v2] ->follow_link() without dropping from " Linus Torvalds
2015-12-09 18:23 ` Al Viro
2015-12-10 0:10 ` Al Viro
2015-12-10 2:40 ` Al Viro
2015-12-11 1:54 ` Al Viro
2015-12-11 7:49 ` Rasmus Villemoes
2015-12-11 23:16 ` Al Viro
2015-12-12 2:00 ` Al Viro
2015-12-13 18:43 ` Rasmus Villemoes
2015-12-13 3:47 ` Al Viro
2015-12-09 21:57 ` NeilBrown
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