linux-kernel - Re: [2.6.21 patch] unconditionally enable SYSFS

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Date:	Tue, 6 Mar 2007 11:01:37 -0800
From:	Greg KH <greg@...ah.com>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Adrian Bunk <bunk@...sta.de>, Theodore Tso <tytso@....edu>,
	Johannes Berg <johannes@...solutions.net>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	yi.zhu@...el.com, jketreno@...ux.intel.com,
	linux-wireless <linux-wireless@...r.kernel.org>, akpm@...l.org
Subject: Re: [2.6.21 patch] unconditionally enable SYSFS_DEPRECATED

On Tue, Mar 06, 2007 at 12:10:09AM -0600, Matt Mackall wrote:
> On Mon, Mar 05, 2007 at 08:03:50PM -0800, Greg KH wrote:
> > On Mon, Mar 05, 2007 at 09:39:47PM -0600, Matt Mackall wrote:
> > > On Mon, Mar 05, 2007 at 06:48:50PM -0800, Greg KH wrote:
> > > > If so, can you disable the option and strace it to see what program is
> > > > trying to access what?  That will put the
> > > > HAL/NetworkManager/libsysfs/distro script finger pointing to rest pretty
> > > > quickly :)
> > > 
> > > Ok, I've got straces of both good and bad (>5M each). Filtered out
> > > random pointer values and the like, diffed, and filtered for /sys/,
> > > and the result's still 1.5M. What should I be looking for?
> > 
> > Failures when trying to read from /sys/class/net/
> > 
> > Or opening the directory and iterating over the subdirs in there.  Or
> > something like that.
> > 
> > But the /sys/class/net/ stuff should hopefully help narrow it down.
> 
> Works:
> 
> 6857  open("/sys/class/net",
> O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 13
> 6857  fstat64(13, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
> 6857  fcntl64(13, F_SETFD, FD_CLOEXEC)  = 0
> 6857  getdents64(13, /* 5 entries */, 4096) = 120
> 6857  readlink("/sys/class/net/eth1", 0x80a2450, 256) = -1 EINVAL
> (Invalid argument)
> 6857  readlink("/sys/class/net/eth1/device",
> "../../../devices/pci0000:00/0000:00:1e.0/0000:02:02.0", 256) = 53
> 6857  readlink("/sys/class/net/lo", 0x80a2450, 256) = -1 EINVAL
> (Invalid argument)
> 6857  readlink("/sys/class/net/lo/device", 0x80a2450, 256) = -1 ENOENT
> (No such
> file or directory)
> 6857  readlink("/sys/class/net/eth0", 0x80a2450, 256) = -1 EINVAL
> (Invalid argument)
> 6857  readlink("/sys/class/net/eth0/device",
> "../../../devices/pci0000:00/0000:00:1e.0/0000:02:01.0", 256) = 53
> 6857  getdents64(13, /* 0 entries */, 4096) = 0
> 6857  close(13)                         = 0
> 
> Breaks:
> 
> 3620  open("/sys/class/net",
> O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 13
> 3620  fstat64(13, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
> 3620  fcntl64(13, F_SETFD, FD_CLOEXEC)  = 0
> 3620  getdents64(13, /* 5 entries */, 4096) = 120
> 3620  readlink("/sys/class/net/eth1",
> "../../devices/pci0000:00/0000:00:1e.0/00\00:02:02.0/eth1", 256) = 55
> 3620
> readlink("/sys/devices/pci0000:00/0000:00:1e.0/0000:02:02.0/eth1/device",
> 0x809e910, 256) = -1 ENOENT (No such file or directory)
> 3620  readlink("/sys/class/net/lo", "../../devices/virtual/net/lo",
> 256) = 28
> 3620  readlink("/sys/devices/virtual/net/lo/device", 0x809e960, 256) =
> -1 ENOEN\T (No such file or directory)
> 3620  readlink("/sys/class/net/eth0",
> "../../devices/pci0000:00/0000:00:1e.0/00\00:02:01.0/eth0", 256) = 55
> 3620
> readlink("/sys/devices/pci0000:00/0000:00:1e.0/0000:02:01.0/eth0/device",
> 0x809e960, 256) = -1 ENOENT (No such file or directory)
> 3620  getdents64(13, /* 0 entries */, 4096) = 0
> 3620  close(13)                         = 0

Ah, that should be simple to fix in the kernel, give me an hour or so...

thanks,

greg k-h
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