Clean up some of the problems with the rtas_flash driver:

 (1) It shouldn't fiddle with the internals of the procfs filesystem (altering
     pde->count).

 (2) If pid namespaces are in effect, then you can get multiple inodes
     connected to a single pde, thereby rendering the pde->count > 2 test
     useless.

 (3) The pde->count fudging doesn't work for forked, dup'd or cloned file
     descriptors, so add static mutexes and use them to wrap access to the
     driver through read, write and release methods.

 (4) The driver can only handle one device, so allocate most of the data
     previously attached to the pde->data as static variables instead (though
     allocate the validation data buffer with kmalloc).

 (5) We don't need to save the pde pointers as long as we have the filenames
     available for removal.

 (6) Don't try to multiplex what the update file read method does based on the
     filename.  Instead provide separate file ops and split the function.

Whilst we're at it, tabulate the procfile information and loop through it when
creating or destroying them rather than manually coding each one.

[Folded fixes from Vasant Hegde <hegdevasant@linux.vnet.ibm.com>]
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
cc: Paul Mackerras <paulus@samba.org>
cc: Anton Blanchard <anton@samba.org>
cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Use remove_proc_subtree() rather than remove_proc_entry() to remove a
device-specific proc directory and all its children.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Jouni Malinen <j@w1.fi>
cc: Johannes Berg <johannes@sipsolutions.net>
cc: linux-wireless@vger.kernel.org
cc: devel@driverdev.osuosl.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Use remove_proc_subtree() rather than remove_proc_entry() to remove a
minor-specific drm proc directory and all its children.

Things could theoretically be improved by storing the drm_minor pointer in the
minor-specific dir proc_dir_entry struct data and then scrapping the list of
proc files - but that's shared with the debugfs interface where you can't do
that, so I don't see an easy way of doing it.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: dri-devel@lists.freedesktop.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Use minor->index to label things, not the name field from the proc_dir_entry
of the /proc/dwm/<minor>/ directory.

Also, use "%u" not "%d" to render the value and use a 12-byte buffer in which
to render the integer, not a 16-byte buffer.  The longest string an unsigned
int can give you is 10 chars (4294967295) plus a NUL, so round up to 12 as the
stack is likely to be 4- or 8-byte aligned.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: dri-devel@lists.freedesktop.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Constify drm_proc_list[] and related pointers.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: dri-devel@lists.freedesktop.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't print proc_dir_entry data in debug as we're soon to have no direct
access to the contents of the PDE.  Print what was put in there instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: mjpeg-users@lists.sourceforge.net
cc: linux-media@vger.kernel.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't access the proc_dir_entry in ReiserFS's r_open(), r_start() r_show()
procfs interface functions.

ReiserFS stores the ->show() method pointer in PDE->data and the super_block
pointer in PDE->parent->data.  This isn't changing.

Currently, ReiserFS passes the PDE pointer into seq_file::private from
r_open() so that r_start() and r_show() can then access it.  Instead, use
seq_open_private() to allocate a two-pointer struct that's passed through
seq_file::private and put the ->show() method and the sb pointers in there.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: reiserfs-devel@vger.kernel.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Supply an accessor function for getting the private data from the parent
proc_dir_entry struct of the proc_dir_entry struct associated with an inode.

ReiserFS, for instance, stores the super_block pointer in the proc directory
it makes for that super_block, and a pointer to the respective seq_file show
function in each of the proc files in that directory.

This allows a reduction in the number of file_operations structs, open
functions and seq_operations structs required.  The problem otherwise is that
each show function requires two pieces of data but only has storage for one
per PDE (and this has no release function).
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NMauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: Jerry Chuang <jerry-chuang@realtek.com>
cc: Maxim Mikityanskiy <maxtram95@gmail.com>
cc: YAMANE Toshiaki <yamanetoshi@gmail.com>
cc: linux-wireless@vger.kernel.org
cc: linux-scsi@vger.kernel.org
cc: devel@driverdev.osuosl.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Use remove_proc_subtree() to remove the airo device subdir and all its
children instead of doing it manually.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: linux-wireless@vger.kernel.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't need to save the PDE of a directory created under /proc/net/rtl8192/ as
we can use proc subtree deletion to get rid of it and all its children.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NMauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: Jerry Chuang <jerry-chuang@realtek.com>
cc: linux-wireless@vger.kernel.org
cc: devel@driverdev.osuosl.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Create a dir under /proc/net/r8180/ named for the device and create that
device's files under there.  This means that there won't be a problem for
multiple devices in the system (if such is possible) and it means we don't
need to save the 'device directory' PDE any more as we can just do a proc
subtree removal.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: Maxim Mikityanskiy <maxtram95@gmail.com>
cc: YAMANE Toshiaki <yamanetoshi@gmail.com>
cc: linux-wireless@vger.kernel.org
cc: devel@driverdev.osuosl.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Add proc_mkdir_data() to allow procfs directories to be created that are
annotated at the time of creation with private data rather than doing this
post-creation.  This means no access is then required to the proc_dir_entry
struct to set this.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NMauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: Neela Syam Kolli <megaraidlinux@lsi.com>
cc: Jerry Chuang <jerry-chuang@realtek.com>
cc: linux-scsi@vger.kernel.org
cc: devel@driverdev.osuosl.org
cc: linux-wireless@vger.kernel.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Move some bits from linux/proc_fs.h to linux/of.h, signal.h and tty.h.

Also move proc_tty_init() and proc_device_tree_init() to fs/proc/internal.h as
they're internal to procfs.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>
cc: devicetree-discuss@lists.ozlabs.org
cc: linux-arch@vger.kernel.org
cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: Jri Slaby <jslaby@suse.cz>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Move PDE_NET() to fs/proc/proc_net.c as that's where the only user is.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Split the proc namespace stuff out into linux/proc_ns.h.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: netdev@vger.kernel.org
cc: Serge E. Hallyn <serge.hallyn@ubuntu.com>
cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Move proc_fd() to fs/proc/fd.h.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Uninline pid_delete_dentry() as it's only used by three function pointers.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Supply accessor functions to set attributes in proc_dir_entry structs.

The following are supplied: proc_set_size() and proc_set_user().
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NMauro Carvalho Chehab <mchehab@redhat.com>
cc: linuxppc-dev@lists.ozlabs.org
cc: linux-media@vger.kernel.org
cc: netdev@vger.kernel.org
cc: linux-wireless@vger.kernel.org
cc: linux-pci@vger.kernel.org
cc: netfilter-devel@vger.kernel.org
cc: alsa-devel@alsa-project.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Split kcore bits from linux/procfs.h into linux/kcore.h.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: NRalf Baechle <ralf@linux-mips.org>
cc: linux-mips@linux-mips.org
cc: sparclinux@vger.kernel.org
cc: x86@kernel.org
cc: linux-mm@kvack.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Include missing linux/magic.h inclusions where the source file is currently
expecting to get magic numbers through linux/proc_fs.h.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: linux-efi@vger.kernel.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Include missing linux/slab.h inclusions where the source file is currently
expecting to get kmalloc() and co. through linux/proc_fs.h.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: linux-s390@vger.kernel.org
cc: sparclinux@vger.kernel.org
cc: linux-efi@vger.kernel.org
cc: linux-mtd@lists.infradead.org
cc: devel@driverdev.osuosl.org
cc: x86@kernel.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Delete create_proc_read_entry() as it no longer has any users.

Also delete read_proc_t, write_proc_t, the read_proc member of the
proc_dir_entry struct and the support functions that use them.  This saves a
pointer for every PDE allocated.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Russell King <linux@arm.linux.org.uk>
cc: Kevin Hilman <khilman@deeprootsystems.com>
cc: Tony Lindgren <tony@atomide.com>
cc: linux-arm-kernel@lists.infradead.org
cc: linux-omap@vger.kernel.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

There's no need to keep this entry in proc, it is PM
related debug only entry. Let's move it into debugfs.

Based on an earlier patch David Howells <dhowells@redhat.com>
to use seq_printf and to update to use create_proc_read_entry().
Signed-off-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NJesper Nilsson <jesper.nilsson@axis.com>
cc: Mikael Starvik <starvik@axis.com>
cc: linux-cris-kernel@axis.com
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Tony Luck <tony.luck@intel.com>
cc: Fenghua Yu <fenghua.yu@intel.com>
cc: linux-ia64@vger.kernel.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Ralf Baechle <ralf@linux-mips.org>
cc: linux-mips@linux-mips.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
cc: Helge Deller <deller@gmx.de>
cc: linux-parisc@vger.kernel.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Paul Mundt <lethal@linux-sh.org>
cc: linux-sh@vger.kernel.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Neela Syam Kolli <megaraidlinux@lsi.com>
cc: James E.J. Bottomley <JBottomley@parallels.com>
cc: linux-scsi@vger.kernel.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: Jouni Malinen <j@w1.fi>
cc: John W. Linville <linville@tuxdriver.com>
cc: Johannes Berg <johannes@sipsolutions.net>
cc: linux-wireless@vger.kernel.org
cc: netdev@vger.kernel.org
cc: devel@driverdev.osuosl.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Simon Kelley <simon@thekelleys.org.uk>
cc: John W. Linville <linville@tuxdriver.com>
cc: linux-wireless@vger.kernel.org
cc: netdev@vger.kernel.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Arnd Bergmann <arnd@arndb.de>
cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Arnd Bergmann <arnd@arndb.de>
cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Arnd Bergmann <arnd@arndb.de>
cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Brian S. Julin <bri@calyx.com>
cc: Helge Deller <deller@gmx.de>
cc: linux-m68k@lists.linux-m68k.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: linux-m68k@lists.linux-m68k.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Li Yang <leoli@freescale.com>
cc: Felipe Balbi <balbi@ti.com>
cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: linux-usb@vger.kernel.org
cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Felipe Balbi <balbi@ti.com>
cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: linux-usb@vger.kernel.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>