[PATCH] devfs: Remove devfs from the kernel tree

This is the first patch in a series of patches that removes devfs
support from the kernel.  This patch removes the core devfs code, and
its private header file.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

5 files changed, 0 insertions, 2943 deletions

diff --git a/fs/Makefile b/fs/Makefile
index d0ea6bf..8913542 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -66,7 +66,6 @@ obj-$(CONFIG_MSDOS_FS)		+= msdos/
 obj-$(CONFIG_VFAT_FS)		+= vfat/
 obj-$(CONFIG_BFS_FS)		+= bfs/
 obj-$(CONFIG_ISO9660_FS)	+= isofs/
-obj-$(CONFIG_DEVFS_FS)		+= devfs/
 obj-$(CONFIG_HFSPLUS_FS)	+= hfsplus/ # Before hfs to find wrapped HFS+
 obj-$(CONFIG_HFS_FS)		+= hfs/
 obj-$(CONFIG_VXFS_FS)		+= freevxfs/
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index d8ecfed..d8d50a70 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -44,7 +44,6 @@
 #include <linux/loop.h>
 #include <linux/auto_fs.h>
 #include <linux/auto_fs4.h>
-#include <linux/devfs_fs.h>
 #include <linux/tty.h>
 #include <linux/vt_kern.h>
 #include <linux/fb.h>
diff --git a/fs/devfs/Makefile b/fs/devfs/Makefile
deleted file mode 100644
index 6dd8d12..0000000
--- a/fs/devfs/Makefile
+++ /dev/null
@@ -1,8 +0,0 @@
-#
-# Makefile for the linux devfs-filesystem routines.
-#
-
-obj-$(CONFIG_DEVFS_FS) += devfs.o
-
-devfs-objs := base.o util.o
-
diff --git a/fs/devfs/base.c b/fs/devfs/base.c
deleted file mode 100644
index 51a97f1..0000000
--- a/fs/devfs/base.c
+++ /dev/null
@@ -1,2836 +0,0 @@
-/*  devfs (Device FileSystem) driver.
-
-    Copyright (C) 1998-2002  Richard Gooch
-
-    This library is free software; you can redistribute it and/or
-    modify it under the terms of the GNU Library General Public
-    License as published by the Free Software Foundation; either
-    version 2 of the License, or (at your option) any later version.
-
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-    Library General Public License for more details.
-
-    You should have received a copy of the GNU Library General Public
-    License along with this library; if not, write to the Free
-    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-    Richard Gooch may be reached by email at  rgooch@atnf.csiro.au
-    The postal address is:
-      Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
-
-    ChangeLog
-
-    19980110   Richard Gooch <rgooch@atnf.csiro.au>
-               Original version.
-  v0.1
-    19980111   Richard Gooch <rgooch@atnf.csiro.au>
-               Created per-fs inode table rather than using inode->u.generic_ip
-  v0.2
-    19980111   Richard Gooch <rgooch@atnf.csiro.au>
-               Created .epoch inode which has a ctime of 0.
-	       Fixed loss of named pipes when dentries lost.
-	       Fixed loss of inode data when devfs_register() follows mknod().
-  v0.3
-    19980111   Richard Gooch <rgooch@atnf.csiro.au>
-               Fix for when compiling with CONFIG_KERNELD.
-    19980112   Richard Gooch <rgooch@atnf.csiro.au>
-               Fix for readdir() which sometimes didn't show entries.
-	       Added <<tolerant>> option to <devfs_register>.
-  v0.4
-    19980113   Richard Gooch <rgooch@atnf.csiro.au>
-               Created <devfs_fill_file> function.
-  v0.5
-    19980115   Richard Gooch <rgooch@atnf.csiro.au>
-               Added subdirectory support. Major restructuring.
-    19980116   Richard Gooch <rgooch@atnf.csiro.au>
-               Fixed <find_by_dev> to not search major=0,minor=0.
-	       Added symlink support.
-  v0.6
-    19980120   Richard Gooch <rgooch@atnf.csiro.au>
-               Created <devfs_mk_dir> function and support directory unregister
-    19980120   Richard Gooch <rgooch@atnf.csiro.au>
-               Auto-ownership uses real uid/gid rather than effective uid/gid.
-  v0.7
-    19980121   Richard Gooch <rgooch@atnf.csiro.au>
-               Supported creation of sockets.
-  v0.8
-    19980122   Richard Gooch <rgooch@atnf.csiro.au>
-               Added DEVFS_FL_HIDE_UNREG flag.
-	       Interface change to <devfs_mk_symlink>.
-               Created <devfs_symlink> to support symlink(2).
-  v0.9
-    19980123   Richard Gooch <rgooch@atnf.csiro.au>
-               Added check to <devfs_fill_file> to check inode is in devfs.
-	       Added optional traversal of symlinks.
-  v0.10
-    19980124   Richard Gooch <rgooch@atnf.csiro.au>
-               Created <devfs_get_flags> and <devfs_set_flags>.
-  v0.11
-    19980125   C. Scott Ananian <cananian@alumni.princeton.edu>
-               Created <devfs_find_handle>.
-    19980125   Richard Gooch <rgooch@atnf.csiro.au>
-               Allow removal of symlinks.
-  v0.12
-    19980125   Richard Gooch <rgooch@atnf.csiro.au>
-               Created <devfs_set_symlink_destination>.
-    19980126   Richard Gooch <rgooch@atnf.csiro.au>
-               Moved DEVFS_SUPER_MAGIC into header file.
-	       Added DEVFS_FL_HIDE flag.
-	       Created <devfs_get_maj_min>.
-	       Created <devfs_get_handle_from_inode>.
-	       Fixed minor bug in <find_by_dev>.
-    19980127   Richard Gooch <rgooch@atnf.csiro.au>
-	       Changed interface to <find_by_dev>, <find_entry>,
-	       <devfs_unregister>, <devfs_fill_file> and <devfs_find_handle>.
-	       Fixed inode times when symlink created with symlink(2).
-  v0.13
-    19980129   C. Scott Ananian <cananian@alumni.princeton.edu>
-               Exported <devfs_set_symlink_destination>, <devfs_get_maj_min>
-	       and <devfs_get_handle_from_inode>.
-    19980129   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created <devfs_unlink> to support unlink(2).
-  v0.14
-    19980129   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed kerneld support for entries in devfs subdirectories.
-    19980130   Richard Gooch <rgooch@atnf.csiro.au>
-	       Bugfixes in <call_kerneld>.
-  v0.15
-    19980207   Richard Gooch <rgooch@atnf.csiro.au>
-	       Call kerneld when looking up unregistered entries.
-  v0.16
-    19980326   Richard Gooch <rgooch@atnf.csiro.au>
-	       Modified interface to <devfs_find_handle> for symlink traversal.
-  v0.17
-    19980331   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed persistence bug with device numbers for manually created
-	       device files.
-	       Fixed problem with recreating symlinks with different content.
-  v0.18
-    19980401   Richard Gooch <rgooch@atnf.csiro.au>
-	       Changed to CONFIG_KMOD.
-	       Hide entries which are manually unlinked.
-	       Always invalidate devfs dentry cache when registering entries.
-	       Created <devfs_rmdir> to support rmdir(2).
-	       Ensure directories created by <devfs_mk_dir> are visible.
-  v0.19
-    19980402   Richard Gooch <rgooch@atnf.csiro.au>
-	       Invalidate devfs dentry cache when making directories.
-	       Invalidate devfs dentry cache when removing entries.
-	       Fixed persistence bug with fifos.
-  v0.20
-    19980421   Richard Gooch <rgooch@atnf.csiro.au>
-	       Print process command when debugging kerneld/kmod.
-	       Added debugging for register/unregister/change operations.
-    19980422   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added "devfs=" boot options.
-  v0.21
-    19980426   Richard Gooch <rgooch@atnf.csiro.au>
-	       No longer lock/unlock superblock in <devfs_put_super>.
-	       Drop negative dentries when they are released.
-	       Manage dcache more efficiently.
-  v0.22
-    19980427   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added DEVFS_FL_AUTO_DEVNUM flag.
-  v0.23
-    19980430   Richard Gooch <rgooch@atnf.csiro.au>
-	       No longer set unnecessary methods.
-  v0.24
-    19980504   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added PID display to <call_kerneld> debugging message.
-	       Added "after" debugging message to <call_kerneld>.
-    19980519   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added "diread" and "diwrite" boot options.
-    19980520   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed persistence problem with permissions.
-  v0.25
-    19980602   Richard Gooch <rgooch@atnf.csiro.au>
-	       Support legacy device nodes.
-	       Fixed bug where recreated inodes were hidden.
-  v0.26
-    19980602   Richard Gooch <rgooch@atnf.csiro.au>
-	       Improved debugging in <get_vfs_inode>.
-    19980607   Richard Gooch <rgooch@atnf.csiro.au>
-	       No longer free old dentries in <devfs_mk_dir>.
-	       Free all dentries for a given entry when deleting inodes.
-  v0.27
-    19980627   Richard Gooch <rgooch@atnf.csiro.au>
-	       Limit auto-device numbering to majors 128 to 239.
-  v0.28
-    19980629   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed inode times persistence problem.
-  v0.29
-    19980704   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed spelling in <devfs_readlink> debug.
-	       Fixed bug in <devfs_setup> parsing "dilookup".
-  v0.30
-    19980705   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed devfs inode leak when manually recreating inodes.
-	       Fixed permission persistence problem when recreating inodes.
-  v0.31
-    19980727   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed harmless "unused variable" compiler warning.
-	       Fixed modes for manually recreated device nodes.
-  v0.32
-    19980728   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added NULL devfs inode warning in <devfs_read_inode>.
-	       Force all inode nlink values to 1.
-  v0.33
-    19980730   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added "dimknod" boot option.
-	       Set inode nlink to 0 when freeing dentries.
-	       Fixed modes for manually recreated symlinks.
-  v0.34
-    19980802   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed bugs in recreated directories and symlinks.
-  v0.35
-    19980806   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed bugs in recreated device nodes.
-    19980807   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed bug in currently unused <devfs_get_handle_from_inode>.
-	       Defined new <devfs_handle_t> type.
-	       Improved debugging when getting entries.
-	       Fixed bug where directories could be emptied.
-  v0.36
-    19980809   Richard Gooch <rgooch@atnf.csiro.au>
-	       Replaced dummy .epoch inode with .devfsd character device.
-    19980810   Richard Gooch <rgooch@atnf.csiro.au>
-	       Implemented devfsd protocol revision 0.
-  v0.37
-    19980819   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added soothing message to warning in <devfs_d_iput>.
-  v0.38
-    19980829   Richard Gooch <rgooch@atnf.csiro.au>
-	       Use GCC extensions for structure initialisations.
-	       Implemented async open notification.
-	       Incremented devfsd protocol revision to 1.
-  v0.39
-    19980908   Richard Gooch <rgooch@atnf.csiro.au>
-	       Moved async open notification to end of <devfs_open>.
-  v0.40
-    19980910   Richard Gooch <rgooch@atnf.csiro.au>
-	       Prepended "/dev/" to module load request.
-	       Renamed <call_kerneld> to <call_kmod>.
-  v0.41
-    19980910   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed typo "AYSNC" -> "ASYNC".
-  v0.42
-    19980910   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added open flag for files.
-  v0.43
-    19980927   Richard Gooch <rgooch@atnf.csiro.au>
-	       Set i_blocks=0 and i_blksize=1024 in <devfs_read_inode>.
-  v0.44
-    19981005   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added test for empty <<name>> in <devfs_find_handle>.
-	       Renamed <generate_path> to <devfs_generate_path> and published.
-  v0.45
-    19981006   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created <devfs_get_fops>.
-  v0.46
-    19981007   Richard Gooch <rgooch@atnf.csiro.au>
-	       Limit auto-device numbering to majors 144 to 239.
-  v0.47
-    19981010   Richard Gooch <rgooch@atnf.csiro.au>
-	       Updated <devfs_follow_link> for VFS change in 2.1.125.
-  v0.48
-    19981022   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created DEVFS_ FL_COMPAT flag.
-  v0.49
-    19981023   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created "nocompat" boot option.
-  v0.50
-    19981025   Richard Gooch <rgooch@atnf.csiro.au>
-	       Replaced "mount" boot option with "nomount".
-  v0.51
-    19981110   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created "only" boot option.
-  v0.52
-    19981112   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added DEVFS_FL_REMOVABLE flag.
-  v0.53
-    19981114   Richard Gooch <rgooch@atnf.csiro.au>
-	       Only call <scan_dir_for_removable> on first call to
-	       <devfs_readdir>.
-  v0.54
-    19981205   Richard Gooch <rgooch@atnf.csiro.au>
-	       Updated <devfs_rmdir> for VFS change in 2.1.131.
-  v0.55
-    19981218   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created <devfs_mk_compat>.
-    19981220   Richard Gooch <rgooch@atnf.csiro.au>
-	       Check for partitions on removable media in <devfs_lookup>.
-  v0.56
-    19990118   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added support for registering regular files.
-	       Created <devfs_set_file_size>.
-	       Update devfs inodes from entries if not changed through FS.
-  v0.57
-    19990124   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed <devfs_fill_file> to only initialise temporary inodes.
-	       Trap for NULL fops in <devfs_register>.
-	       Return -ENODEV in <devfs_fill_file> for non-driver inodes.
-  v0.58
-    19990126   Richard Gooch <rgooch@atnf.csiro.au>
-	       Switched from PATH_MAX to DEVFS_PATHLEN.
-  v0.59
-    19990127   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created "nottycompat" boot option.
-  v0.60
-    19990318   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed <devfsd_read> to not overrun event buffer.
-  v0.61
-    19990329   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created <devfs_auto_unregister>.
-  v0.62
-    19990330   Richard Gooch <rgooch@atnf.csiro.au>
-	       Don't return unregistred entries in <devfs_find_handle>.
-	       Panic in <devfs_unregister> if entry unregistered.
-    19990401   Richard Gooch <rgooch@atnf.csiro.au>
-	       Don't panic in <devfs_auto_unregister> for duplicates.
-  v0.63
-    19990402   Richard Gooch <rgooch@atnf.csiro.au>
-	       Don't unregister already unregistered entries in <unregister>.
-  v0.64
-    19990510   Richard Gooch <rgooch@atnf.csiro.au>
-	       Disable warning messages when unable to read partition table for
-	       removable media.
-  v0.65
-    19990512   Richard Gooch <rgooch@atnf.csiro.au>
-	       Updated <devfs_lookup> for VFS change in 2.3.1-pre1.
-	       Created "oops-on-panic" boot option.
-	       Improved debugging in <devfs_register> and <devfs_unregister>.
-  v0.66
-    19990519   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added documentation for some functions.
-    19990525   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed "oops-on-panic" boot option: now always Oops.
-  v0.67
-    19990531   Richard Gooch <rgooch@atnf.csiro.au>
-	       Improved debugging in <devfs_register>.
-  v0.68
-    19990604   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added "diunlink" and "nokmod" boot options.
-	       Removed superfluous warning message in <devfs_d_iput>.
-  v0.69
-    19990611   Richard Gooch <rgooch@atnf.csiro.au>
-	       Took account of change to <d_alloc_root>.
-  v0.70
-    19990614   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created separate event queue for each mounted devfs.
-	       Removed <devfs_invalidate_dcache>.
-	       Created new ioctl()s.
-	       Incremented devfsd protocol revision to 3.
-	       Fixed bug when re-creating directories: contents were lost.
-	       Block access to inodes until devfsd updates permissions.
-    19990615   Richard Gooch <rgooch@atnf.csiro.au>
-	       Support 2.2.x kernels.
-  v0.71
-    19990623   Richard Gooch <rgooch@atnf.csiro.au>
-	       Switched to sending process uid/gid to devfsd.
-	       Renamed <call_kmod> to <try_modload>.
-	       Added DEVFSD_NOTIFY_LOOKUP event.
-    19990624   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added DEVFSD_NOTIFY_CHANGE event.
-	       Incremented devfsd protocol revision to 4.
-  v0.72
-    19990713   Richard Gooch <rgooch@atnf.csiro.au>
-	       Return EISDIR rather than EINVAL for read(2) on directories.
-  v0.73
-    19990809   Richard Gooch <rgooch@atnf.csiro.au>
-	       Changed <devfs_setup> to new __init scheme.
-  v0.74
-    19990901   Richard Gooch <rgooch@atnf.csiro.au>
-	       Changed remaining function declarations to new __init scheme.
-  v0.75
-    19991013   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created <devfs_get_info>, <devfs_set_info>,
-	       <devfs_get_first_child> and <devfs_get_next_sibling>.
-	       Added <<dir>> parameter to <devfs_register>, <devfs_mk_compat>,
-	       <devfs_mk_dir> and <devfs_find_handle>.
-	       Work sponsored by SGI.
-  v0.76
-    19991017   Richard Gooch <rgooch@atnf.csiro.au>
-	       Allow multiple unregistrations.
-	       Work sponsored by SGI.
-  v0.77
-    19991026   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added major and minor number to devfsd protocol.
-	       Incremented devfsd protocol revision to 5.
-	       Work sponsored by SGI.
-  v0.78
-    19991030   Richard Gooch <rgooch@atnf.csiro.au>
-	       Support info pointer for all devfs entry types.
-	       Added <<info>> parameter to <devfs_mk_dir> and
-	       <devfs_mk_symlink>.
-	       Work sponsored by SGI.
-  v0.79
-    19991031   Richard Gooch <rgooch@atnf.csiro.au>
-	       Support "../" when searching devfs namespace.
-	       Work sponsored by SGI.
-  v0.80
-    19991101   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created <devfs_get_unregister_slave>.
-	       Work sponsored by SGI.
-  v0.81
-    19991103   Richard Gooch <rgooch@atnf.csiro.au>
-	       Exported <devfs_get_parent>.
-	       Work sponsored by SGI.
-  v0.82
-    19991104   Richard Gooch <rgooch@atnf.csiro.au>
-               Removed unused <devfs_set_symlink_destination>.
-    19991105   Richard Gooch <rgooch@atnf.csiro.au>
-               Do not hide entries from devfsd or children.
-	       Removed DEVFS_ FL_TTY_COMPAT flag.
-	       Removed "nottycompat" boot option.
-	       Removed <devfs_mk_compat>.
-	       Work sponsored by SGI.
-  v0.83
-    19991107   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added DEVFS_FL_WAIT flag.
-	       Work sponsored by SGI.
-  v0.84
-    19991107   Richard Gooch <rgooch@atnf.csiro.au>
-	       Support new "disc" naming scheme in <get_removable_partition>.
-	       Allow NULL fops in <devfs_register>.
-	       Work sponsored by SGI.
-  v0.85
-    19991110   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fall back to major table if NULL fops given to <devfs_register>.
-	       Work sponsored by SGI.
-  v0.86
-    19991204   Richard Gooch <rgooch@atnf.csiro.au>
-	       Support fifos when unregistering.
-	       Work sponsored by SGI.
-  v0.87
-    19991209   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed obsolete DEVFS_ FL_COMPAT and DEVFS_ FL_TOLERANT flags.
-	       Work sponsored by SGI.
-  v0.88
-    19991214   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed kmod support.
-	       Work sponsored by SGI.
-  v0.89
-    19991216   Richard Gooch <rgooch@atnf.csiro.au>
-	       Improved debugging in <get_vfs_inode>.
-	       Ensure dentries created by devfsd will be cleaned up.
-	       Work sponsored by SGI.
-  v0.90
-    19991223   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created <devfs_get_name>.
-	       Work sponsored by SGI.
-  v0.91
-    20000203   Richard Gooch <rgooch@atnf.csiro.au>
-	       Ported to kernel 2.3.42.
-	       Removed <devfs_fill_file>.
-	       Work sponsored by SGI.
-  v0.92
-    20000306   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added DEVFS_ FL_NO_PERSISTENCE flag.
-	       Removed unnecessary call to <update_devfs_inode_from_entry> in
-	       <devfs_readdir>.
-	       Work sponsored by SGI.
-  v0.93
-    20000413   Richard Gooch <rgooch@atnf.csiro.au>
-	       Set inode->i_size to correct size for symlinks.
-    20000414   Richard Gooch <rgooch@atnf.csiro.au>
-	       Only give lookup() method to directories to comply with new VFS
-	       assumptions.
-	       Work sponsored by SGI.
-    20000415   Richard Gooch <rgooch@atnf.csiro.au>
-	       Remove unnecessary tests in symlink methods.
-	       Don't kill existing block ops in <devfs_read_inode>.
-	       Work sponsored by SGI.
-  v0.94
-    20000424   Richard Gooch <rgooch@atnf.csiro.au>
-	       Don't create missing directories in <devfs_find_handle>.
-	       Work sponsored by SGI.
-  v0.95
-    20000430   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added CONFIG_DEVFS_MOUNT.
-	       Work sponsored by SGI.
-  v0.96
-    20000608   Richard Gooch <rgooch@atnf.csiro.au>
-	       Disabled multi-mount capability (use VFS bindings instead).
-	       Work sponsored by SGI.
-  v0.97
-    20000610   Richard Gooch <rgooch@atnf.csiro.au>
-	       Switched to FS_SINGLE to disable multi-mounts.
-    20000612   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed module support.
-	       Removed multi-mount code.
-	       Removed compatibility macros: VFS has changed too much.
-	       Work sponsored by SGI.
-  v0.98
-    20000614   Richard Gooch <rgooch@atnf.csiro.au>
-	       Merged devfs inode into devfs entry.
-	       Work sponsored by SGI.
-  v0.99
-    20000619   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed dead code in <devfs_register> which used to call
-	       <free_dentries>.
-	       Work sponsored by SGI.
-  v0.100
-    20000621   Richard Gooch <rgooch@atnf.csiro.au>
-	       Changed interface to <devfs_register>.
-	       Work sponsored by SGI.
-  v0.101
-    20000622   Richard Gooch <rgooch@atnf.csiro.au>
-	       Simplified interface to <devfs_mk_symlink> and <devfs_mk_dir>.
-	       Simplified interface to <devfs_find_handle>.
-	       Work sponsored by SGI.
-  v0.102
-    20010519   Richard Gooch <rgooch@atnf.csiro.au>
-	       Ensure <devfs_generate_path> terminates string for root entry.
-	       Exported <devfs_get_name> to modules.
-    20010520   Richard Gooch <rgooch@atnf.csiro.au>
-	       Make <devfs_mk_symlink> send events to devfsd.
-	       Cleaned up option processing in <devfs_setup>.
-    20010521   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed bugs in handling symlinks: could leak or cause Oops.
-    20010522   Richard Gooch <rgooch@atnf.csiro.au>
-	       Cleaned up directory handling by separating fops.
-  v0.103
-    20010601   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed handling of inverted options in <devfs_setup>.
-  v0.104
-    20010604   Richard Gooch <rgooch@atnf.csiro.au>
-	       Adjusted <try_modload> to account for <devfs_generate_path> fix.
-  v0.105
-    20010617   Richard Gooch <rgooch@atnf.csiro.au>
-	       Answered question posed by Al Viro and removed his comments.
-	       Moved setting of registered flag after other fields are changed.
-	       Fixed race between <devfsd_close> and <devfsd_notify_one>.
-	       Global VFS changes added bogus BKL to <devfsd_close>: removed.
-	       Widened locking in <devfs_readlink> and <devfs_follow_link>.
-	       Replaced <devfsd_read> stack usage with <devfsd_ioctl> kmalloc.
-	       Simplified locking in <devfsd_ioctl> and fixed memory leak.
-  v0.106
-    20010709   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed broken devnum allocation and use <devfs_alloc_devnum>.
-	       Fixed old devnum leak by calling new <devfs_dealloc_devnum>.
-  v0.107
-    20010712   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed bug in <devfs_setup> which could hang boot process.
-  v0.108
-    20010730   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added DEVFSD_NOTIFY_DELETE event.
-    20010801   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed #include <asm/segment.h>.
-  v0.109
-    20010807   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed inode table races by removing it and using
-	       inode->u.generic_ip instead.
-	       Moved <devfs_read_inode> into <get_vfs_inode>.
-	       Moved <devfs_write_inode> into <devfs_notify_change>.
-  v0.110
-    20010808   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed race in <devfs_do_symlink> for uni-processor.
-  v0.111
-    20010818   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed remnant of multi-mount support in <devfs_mknod>.
-               Removed unused DEVFS_FL_SHOW_UNREG flag.
-  v0.112
-    20010820   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed nlink field from struct devfs_inode.
-  v0.113
-    20010823   Richard Gooch <rgooch@atnf.csiro.au>
-	       Replaced BKL with global rwsem to protect symlink data (quick
-	       and dirty hack).
-  v0.114
-    20010827   Richard Gooch <rgooch@atnf.csiro.au>
-	       Replaced global rwsem for symlink with per-link refcount.
-  v0.115
-    20010919   Richard Gooch <rgooch@atnf.csiro.au>
-	       Set inode->i_mapping->a_ops for block nodes in <get_vfs_inode>.
-  v0.116
-    20011008   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed overrun in <devfs_link> by removing function (not needed).
-    20011009   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed buffer underrun in <try_modload>.
-    20011029   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed race in <devfsd_ioctl> when setting event mask.
-    20011114   Richard Gooch <rgooch@atnf.csiro.au>
-	       First release of new locking code.
-  v1.0
-    20011117   Richard Gooch <rgooch@atnf.csiro.au>
-	       Discard temporary buffer, now use "%s" for dentry names.
-    20011118   Richard Gooch <rgooch@atnf.csiro.au>
-	       Don't generate path in <try_modload>: use fake entry instead.
-	       Use "existing" directory in <_devfs_make_parent_for_leaf>.
-    20011122   Richard Gooch <rgooch@atnf.csiro.au>
-	       Use slab cache rather than fixed buffer for devfsd events.
-  v1.1
-    20011125   Richard Gooch <rgooch@atnf.csiro.au>
-	       Send DEVFSD_NOTIFY_REGISTERED events in <devfs_mk_dir>.
-    20011127   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed locking bug in <devfs_d_revalidate_wait> due to typo.
-	       Do not send CREATE, CHANGE, ASYNC_OPEN or DELETE events from
-	       devfsd or children.
-  v1.2
-    20011202   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed bug in <devfsd_read>: was dereferencing freed pointer.
-  v1.3
-    20011203   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed bug in <devfsd_close>: was dereferencing freed pointer.
-	       Added process group check for devfsd privileges.
-  v1.4
-    20011204   Richard Gooch <rgooch@atnf.csiro.au>
-	       Use SLAB_ATOMIC in <devfsd_notify_de> from <devfs_d_delete>.
-  v1.5
-    20011211   Richard Gooch <rgooch@atnf.csiro.au>
-	       Return old entry in <devfs_mk_dir> for 2.4.x kernels.
-    20011212   Richard Gooch <rgooch@atnf.csiro.au>
-	       Increment refcount on module in <check_disc_changed>.
-    20011215   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created <devfs_get_handle> and exported <devfs_put>.
-	       Increment refcount on module in <devfs_get_ops>.
-	       Created <devfs_put_ops>.
-  v1.6
-    20011216   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added poisoning to <devfs_put>.
-	       Improved debugging messages.
-  v1.7
-    20011221   Richard Gooch <rgooch@atnf.csiro.au>
-	       Corrected (made useful) debugging message in <unregister>.
-	       Moved <kmem_cache_create> in <mount_devfs_fs> to <init_devfs_fs>
-    20011224   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added magic number to guard against scribbling drivers.
-    20011226   Richard Gooch <rgooch@atnf.csiro.au>
-	       Only return old entry in <devfs_mk_dir> if a directory.
-	       Defined macros for error and debug messages.
-  v1.8
-    20020113   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed (rare, old) race in <devfs_lookup>.
-  v1.9
-    20020120   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed deadlock bug in <devfs_d_revalidate_wait>.
-	       Tag VFS deletable in <devfs_mk_symlink> if handle ignored.
-  v1.10
-    20020129   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added KERN_* to remaining messages.
-	       Cleaned up declaration of <stat_read>.
-  v1.11
-    20020219   Richard Gooch <rgooch@atnf.csiro.au>
-	       Changed <devfs_rmdir> to allow later additions if not yet empty.
-  v1.12
-    20020406   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed silently introduced calls to lock_kernel() and
-	       unlock_kernel() due to recent VFS locking changes. BKL isn't
-	       required in devfs.
-  v1.13
-    20020428   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed 2.4.x compatibility code.
-  v1.14
-    20020510   Richard Gooch <rgooch@atnf.csiro.au>
-	       Added BKL to <devfs_open> because drivers still need it.
-  v1.15
-    20020512   Richard Gooch <rgooch@atnf.csiro.au>
-	       Protected <scan_dir_for_removable> and <get_removable_partition>
-	       from changing directory contents.
-  v1.16
-    20020514   Richard Gooch <rgooch@atnf.csiro.au>
-	       Minor cleanup of <scan_dir_for_removable>.
-  v1.17
-    20020721   Richard Gooch <rgooch@atnf.csiro.au>
-	       Switched to ISO C structure field initialisers.
-	       Switch to set_current_state() and move before add_wait_queue().
-    20020722   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed devfs entry leak in <devfs_readdir> when *readdir fails.
-  v1.18
-    20020725   Richard Gooch <rgooch@atnf.csiro.au>
-	       Created <devfs_find_and_unregister>.
-  v1.19
-    20020728   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed deprecated <devfs_find_handle>.
-  v1.20
-    20020820   Richard Gooch <rgooch@atnf.csiro.au>
-	       Fixed module unload race in <devfs_open>.
-  v1.21
-    20021013   Richard Gooch <rgooch@atnf.csiro.au>
-	       Removed DEVFS_ FL_AUTO_OWNER.
-	       Switched lingering structure field initialiser to ISO C.
-	       Added locking when updating FCB flags.
-  v1.22
-*/
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/time.h>
-#include <linux/tty.h>
-#include <linux/timer.h>
-#include <linux/config.h>
-#include <linux/kernel.h>
-#include <linux/wait.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/ioport.h>
-#include <linux/delay.h>
-#include <linux/ctype.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/devfs_fs.h>
-#include <linux/devfs_fs_kernel.h>
-#include <linux/smp_lock.h>
-#include <linux/smp.h>
-#include <linux/rwsem.h>
-#include <linux/sched.h>
-#include <linux/namei.h>
-#include <linux/bitops.h>
-
-#include <asm/uaccess.h>
-#include <asm/io.h>
-#include <asm/processor.h>
-#include <asm/system.h>
-#include <asm/pgtable.h>
-#include <asm/atomic.h>
-
-#define DEVFS_VERSION            "2004-01-31"
-
-#define DEVFS_NAME "devfs"
-
-#define FIRST_INODE 1
-
-#define STRING_LENGTH 256
-#define FAKE_BLOCK_SIZE 1024
-#define POISON_PTR ( *(void **) poison_array )
-#define MAGIC_VALUE 0x327db823
-
-#ifndef TRUE
-#  define TRUE 1
-#  define FALSE 0
-#endif
-
-#define MODE_DIR (S_IFDIR | S_IWUSR | S_IRUGO | S_IXUGO)
-
-#define DEBUG_NONE         0x0000000
-#define DEBUG_MODULE_LOAD  0x0000001
-#define DEBUG_REGISTER     0x0000002
-#define DEBUG_UNREGISTER   0x0000004
-#define DEBUG_FREE         0x0000008
-#define DEBUG_SET_FLAGS    0x0000010
-#define DEBUG_S_READ       0x0000100	/*  Break  */
-#define DEBUG_I_LOOKUP     0x0001000	/*  Break  */
-#define DEBUG_I_CREATE     0x0002000
-#define DEBUG_I_GET        0x0004000
-#define DEBUG_I_CHANGE     0x0008000
-#define DEBUG_I_UNLINK     0x0010000
-#define DEBUG_I_RLINK      0x0020000
-#define DEBUG_I_FLINK      0x0040000
-#define DEBUG_I_MKNOD      0x0080000
-#define DEBUG_F_READDIR    0x0100000	/*  Break  */
-#define DEBUG_D_DELETE     0x1000000	/*  Break  */
-#define DEBUG_D_RELEASE    0x2000000
-#define DEBUG_D_IPUT       0x4000000
-#define DEBUG_ALL          0xfffffff
-#define DEBUG_DISABLED     DEBUG_NONE
-
-#define OPTION_NONE             0x00
-#define OPTION_MOUNT            0x01
-
-#define PRINTK(format, args...) \
-   {printk (KERN_ERR "%s" format, __FUNCTION__ , ## args);}
-
-#define OOPS(format, args...) \
-   {printk (KERN_CRIT "%s" format, __FUNCTION__ , ## args); \
-    printk ("Forcing Oops\n"); \
-    BUG();}
-
-#ifdef CONFIG_DEVFS_DEBUG
-#  define VERIFY_ENTRY(de) \
-   {if ((de) && (de)->magic_number != MAGIC_VALUE) \
-        OOPS ("(%p): bad magic value: %x\n", (de), (de)->magic_number);}
-#  define WRITE_ENTRY_MAGIC(de,magic) (de)->magic_number = (magic)
-#  define DPRINTK(flag, format, args...) \
-   {if (devfs_debug & flag) \
-	printk (KERN_INFO "%s" format, __FUNCTION__ , ## args);}
-#else
-#  define VERIFY_ENTRY(de)
-#  define WRITE_ENTRY_MAGIC(de,magic)
-#  define DPRINTK(flag, format, args...)
-#endif
-
-typedef struct devfs_entry *devfs_handle_t;
-
-struct directory_type {
-	rwlock_t lock;		/*  Lock for searching(R)/updating(W)   */
-	struct devfs_entry *first;
-	struct devfs_entry *last;
-	unsigned char no_more_additions:1;
-};
-
-struct symlink_type {
-	unsigned int length;	/*  Not including the NULL-termimator       */
-	char *linkname;		/*  This is NULL-terminated                 */
-};
-
-struct devfs_inode {		/*  This structure is for "persistent" inode storage  */
-	struct dentry *dentry;
-	struct timespec atime;
-	struct timespec mtime;
-	struct timespec ctime;
-	unsigned int ino;	/*  Inode number as seen in the VFS         */
-	uid_t uid;
-	gid_t gid;
-};
-
-struct devfs_entry {
-#ifdef CONFIG_DEVFS_DEBUG
-	unsigned int magic_number;
-#endif
-	void *info;
-	atomic_t refcount;	/*  When this drops to zero, it's unused    */
-	union {
-		struct directory_type dir;
-		dev_t dev;
-		struct symlink_type symlink;
-		const char *name;	/*  Only used for (mode == 0)               */
-	} u;
-	struct devfs_entry *prev;	/*  Previous entry in the parent directory  */
-	struct devfs_entry *next;	/*  Next entry in the parent directory      */
-	struct devfs_entry *parent;	/*  The parent directory                    */
-	struct devfs_inode inode;
-	umode_t mode;
-	unsigned short namelen;	/*  I think 64k+ filenames are a way off... */
-	unsigned char vfs:1;	/*  Whether the VFS may delete the entry   */
-	char name[1];		/*  This is just a dummy: the allocated array
-				   is bigger. This is NULL-terminated      */
-};
-
-/*  The root of the device tree  */
-static struct devfs_entry *root_entry;
-
-struct devfsd_buf_entry {
-	struct devfs_entry *de;	/*  The name is generated with this         */
-	unsigned short type;	/*  The type of event                       */
-	umode_t mode;
-	uid_t uid;
-	gid_t gid;
-	struct devfsd_buf_entry *next;
-};
-
-struct fs_info {		/*  This structure is for the mounted devfs  */
-	struct super_block *sb;
-	spinlock_t devfsd_buffer_lock;	/*  Lock when inserting/deleting events  */
-	struct devfsd_buf_entry *devfsd_first_event;
-	struct devfsd_buf_entry *devfsd_last_event;
-	volatile int devfsd_sleeping;
-	volatile struct task_struct *devfsd_task;
-	volatile pid_t devfsd_pgrp;
-	volatile struct file *devfsd_file;
-	struct devfsd_notify_struct *devfsd_info;
-	volatile unsigned long devfsd_event_mask;
-	atomic_t devfsd_overrun_count;
-	wait_queue_head_t devfsd_wait_queue;	/*  Wake devfsd on input       */
-	wait_queue_head_t revalidate_wait_queue;	/*  Wake when devfsd sleeps    */
-};
-
-static struct fs_info fs_info = {.devfsd_buffer_lock = SPIN_LOCK_UNLOCKED };
-static kmem_cache_t *devfsd_buf_cache;
-#ifdef CONFIG_DEVFS_DEBUG
-static unsigned int devfs_debug_init __initdata = DEBUG_NONE;
-static unsigned int devfs_debug = DEBUG_NONE;
-static DEFINE_SPINLOCK(stat_lock);
-static unsigned int stat_num_entries;
-static unsigned int stat_num_bytes;
-#endif
-static unsigned char poison_array[8] =
-    { 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a };
-
-#ifdef CONFIG_DEVFS_MOUNT
-static unsigned int boot_options = OPTION_MOUNT;
-#else
-static unsigned int boot_options = OPTION_NONE;
-#endif
-
-/*  Forward function declarations  */
-static devfs_handle_t _devfs_walk_path(struct devfs_entry *dir,
-				       const char *name, int namelen,
-				       int traverse_symlink);
-static ssize_t devfsd_read(struct file *file, char __user *buf, size_t len,
-			   loff_t * ppos);
-static int devfsd_ioctl(struct inode *inode, struct file *file,
-			unsigned int cmd, unsigned long arg);
-static int devfsd_close(struct inode *inode, struct file *file);
-#ifdef CONFIG_DEVFS_DEBUG
-static ssize_t stat_read(struct file *file, char __user *buf, size_t len,
-			 loff_t * ppos);
-static const struct file_operations stat_fops = {
-	.open = nonseekable_open,
-	.read = stat_read,
-};
-#endif
-
-/*  Devfs daemon file operations  */
-static const struct file_operations devfsd_fops = {
-	.open = nonseekable_open,
-	.read = devfsd_read,
-	.ioctl = devfsd_ioctl,
-	.release = devfsd_close,
-};
-
-/*  Support functions follow  */
-
-/**
- *	devfs_get - Get a reference to a devfs entry.
- *	@de:  The devfs entry.
- */
-
-static struct devfs_entry *devfs_get(struct devfs_entry *de)
-{
-	VERIFY_ENTRY(de);
-	if (de)
-		atomic_inc(&de->refcount);
-	return de;
-}				/*  End Function devfs_get  */
-
-/**
- *	devfs_put - Put (release) a reference to a devfs entry.
- *	@de:  The handle to the devfs entry.
- */
-
-static void devfs_put(devfs_handle_t de)
-{
-	if (!de)
-		return;
-	VERIFY_ENTRY(de);
-	if (de->info == POISON_PTR)
-		OOPS("(%p): poisoned pointer\n", de);
-	if (!atomic_dec_and_test(&de->refcount))
-		return;
-	if (de == root_entry)
-		OOPS("(%p): root entry being freed\n", de);
-	DPRINTK(DEBUG_FREE, "(%s): de: %p, parent: %p \"%s\"\n",
-		de->name, de, de->parent,
-		de->parent ? de->parent->name : "no parent");
-	if (S_ISLNK(de->mode))
-		kfree(de->u.symlink.linkname);
-	WRITE_ENTRY_MAGIC(de, 0);
-#ifdef CONFIG_DEVFS_DEBUG
-	spin_lock(&stat_lock);
-	--stat_num_entries;
-	stat_num_bytes -= sizeof *de + de->namelen;
-	if (S_ISLNK(de->mode))
-		stat_num_bytes -= de->u.symlink.length + 1;
-	spin_unlock(&stat_lock);
-#endif
-	de->info = POISON_PTR;
-	kfree(de);
-}				/*  End Function devfs_put  */
-
-/**
- *	_devfs_search_dir - Search for a devfs entry in a directory.
- *	@dir:  The directory to search.
- *	@name:  The name of the entry to search for.
- *	@namelen:  The number of characters in @name.
- *
- *  Search for a devfs entry in a directory and returns a pointer to the entry
- *   on success, else %NULL. The directory must be locked already.
- *   An implicit devfs_get() is performed on the returned entry.
- */
-
-static struct devfs_entry *_devfs_search_dir(struct devfs_entry *dir,
-					     const char *name,
-					     unsigned int namelen)
-{
-	struct devfs_entry *curr;
-
-	if (!S_ISDIR(dir->mode)) {
-		PRINTK("(%s): not a directory\n", dir->name);
-		return NULL;
-	}
-	for (curr = dir->u.dir.first; curr != NULL; curr = curr->next) {
-		if (curr->namelen != namelen)
-			continue;
-		if (memcmp(curr->name, name, namelen) == 0)
-			break;
-		/*  Not found: try the next one  */
-	}
-	return devfs_get(curr);
-}				/*  End Function _devfs_search_dir  */
-
-/**
- *	_devfs_alloc_entry - Allocate a devfs entry.
- *	@name:     the name of the entry
- *	@namelen:  the number of characters in @name
- *      @mode:     the mode for the entry
- *
- *  Allocate a devfs entry and returns a pointer to the entry on success, else
- *   %NULL.
- */
-
-static struct devfs_entry *_devfs_alloc_entry(const char *name,
-					      unsigned int namelen,
-					      umode_t mode)
-{
-	struct devfs_entry *new;
-	static unsigned long inode_counter = FIRST_INODE;
-	static DEFINE_SPINLOCK(counter_lock);
-
-	if (name && (namelen < 1))
-		namelen = strlen(name);
-	if ((new = kmalloc(sizeof *new + namelen, GFP_KERNEL)) == NULL)
-		return NULL;
-	memset(new, 0, sizeof *new + namelen);	/*  Will set '\0' on name  */
-	new->mode = mode;
-	if (S_ISDIR(mode))
-		rwlock_init(&new->u.dir.lock);
-	atomic_set(&new->refcount, 1);
-	spin_lock(&counter_lock);
-	new->inode.ino = inode_counter++;
-	spin_unlock(&counter_lock);
-	if (name)
-		memcpy(new->name, name, namelen);
-	new->namelen = namelen;
-	WRITE_ENTRY_MAGIC(new, MAGIC_VALUE);
-#ifdef CONFIG_DEVFS_DEBUG
-	spin_lock(&stat_lock);
-	++stat_num_entries;
-	stat_num_bytes += sizeof *new + namelen;
-	spin_unlock(&stat_lock);
-#endif
-	return new;
-}				/*  End Function _devfs_alloc_entry  */
-
-/**
- *	_devfs_append_entry - Append a devfs entry to a directory's child list.
- *	@dir:  The directory to add to.
- *	@de:  The devfs entry to append.
- *	@old_de: If an existing entry exists, it will be written here. This may
- *		 be %NULL. An implicit devfs_get() is performed on this entry.
- *
- *  Append a devfs entry to a directory's list of children, checking first to
- *   see if an entry of the same name exists. The directory will be locked.
- *   The value 0 is returned on success, else a negative error code.
- *   On failure, an implicit devfs_put() is performed on %de.
- */
-
-static int _devfs_append_entry(devfs_handle_t dir, devfs_handle_t de,
-			       devfs_handle_t * old_de)
-{
-	int retval;
-
-	if (old_de)
-		*old_de = NULL;
-	if (!S_ISDIR(dir->mode)) {
-		PRINTK("(%s): dir: \"%s\" is not a directory\n", de->name,
-		       dir->name);
-		devfs_put(de);
-		return -ENOTDIR;
-	}
-	write_lock(&dir->u.dir.lock);
-	if (dir->u.dir.no_more_additions)
-		retval = -ENOENT;
-	else {
-		struct devfs_entry *old;
-
-		old = _devfs_search_dir(dir, de->name, de->namelen);
-		if (old_de)
-			*old_de = old;
-		else
-			devfs_put(old);
-		if (old == NULL) {
-			de->parent = dir;
-			de->prev = dir->u.dir.last;
-			/*  Append to the directory's list of children  */
-			if (dir->u.dir.first == NULL)
-				dir->u.dir.first = de;
-			else
-				dir->u.dir.last->next = de;
-			dir->u.dir.last = de;
-			retval = 0;
-		} else
-			retval = -EEXIST;
-	}
-	write_unlock(&dir->u.dir.lock);
-	if (retval)
-		devfs_put(de);
-	return retval;
-}				/*  End Function _devfs_append_entry  */
-
-/**
- *	_devfs_get_root_entry - Get the root devfs entry.
- *
- *	Returns the root devfs entry on success, else %NULL.
- *
- *	TODO it must be called asynchronously due to the fact
- *	that devfs is initialized relatively late. Proper way
- *	is to remove module_init from init_devfs_fs and manually
- *	call it early enough during system init
- */
-
-static struct devfs_entry *_devfs_get_root_entry(void)
-{
-	struct devfs_entry *new;
-	static DEFINE_SPINLOCK(root_lock);
-
-	if (root_entry)
-		return root_entry;
-
-	new = _devfs_alloc_entry(NULL, 0, MODE_DIR);
-	if (new == NULL)
-		return NULL;
-
-	spin_lock(&root_lock);
-	if (root_entry) {
-		spin_unlock(&root_lock);
-		devfs_put(new);
-		return root_entry;
-	}
-	root_entry = new;
-	spin_unlock(&root_lock);
-
-	return root_entry;
-}				/*  End Function _devfs_get_root_entry  */
-
-/**
- *	_devfs_descend - Descend down a tree using the next component name.
- *	@dir:  The directory to search.
- *	@name:  The component name to search for.
- *	@namelen:  The length of %name.
- *	@next_pos:  The position of the next '/' or '\0' is written here.
- *
- *  Descend into a directory, searching for a component. This function forms
- *   the core of a tree-walking algorithm. The directory will be locked.
- *   The devfs entry corresponding to the component is returned. If there is
- *   no matching entry, %NULL is returned.
- *   An implicit devfs_get() is performed on the returned entry.
- */
-
-static struct devfs_entry *_devfs_descend(struct devfs_entry *dir,
-					  const char *name, int namelen,
-					  int *next_pos)
-{
-	const char *stop, *ptr;
-	struct devfs_entry *entry;
-
-	if ((namelen >= 3) && (strncmp(name, "../", 3) == 0)) {	/*  Special-case going to parent directory  */
-		*next_pos = 3;
-		return devfs_get(dir->parent);
-	}
-	stop = name + namelen;
-	/*  Search for a possible '/'  */
-	for (ptr = name; (ptr < stop) && (*ptr != '/'); ++ptr) ;
-	*next_pos = ptr - name;
-	read_lock(&dir->u.dir.lock);
-	entry = _devfs_search_dir(dir, name, *next_pos);
-	read_unlock(&dir->u.dir.lock);
-	return entry;
-}				/*  End Function _devfs_descend  */
-
-static devfs_handle_t _devfs_make_parent_for_leaf(struct devfs_entry *dir,
-						  const char *name,
-						  int namelen, int *leaf_pos)
-{
-	int next_pos = 0;
-
-	if (dir == NULL)
-		dir = _devfs_get_root_entry();
-	if (dir == NULL)
-		return NULL;
-	devfs_get(dir);
-	/*  Search for possible trailing component and ignore it  */
-	for (--namelen; (namelen > 0) && (name[namelen] != '/'); --namelen) ;
-	*leaf_pos = (name[namelen] == '/') ? (namelen + 1) : 0;
-	for (; namelen > 0; name += next_pos, namelen -= next_pos) {
-		struct devfs_entry *de, *old = NULL;
-
-		if ((de =
-		     _devfs_descend(dir, name, namelen, &next_pos)) == NULL) {
-			de = _devfs_alloc_entry(name, next_pos, MODE_DIR);
-			devfs_get(de);
-			if (!de || _devfs_append_entry(dir, de, &old)) {
-				devfs_put(de);
-				if (!old || !S_ISDIR(old->mode)) {
-					devfs_put(old);
-					devfs_put(dir);
-					return NULL;
-				}
-				de = old;	/*  Use the existing directory  */
-			}
-		}
-		if (de == dir->parent) {
-			devfs_put(dir);
-			devfs_put(de);
-			return NULL;
-		}
-		devfs_put(dir);
-		dir = de;
-		if (name[next_pos] == '/')
-			++next_pos;
-	}
-	return dir;
-}				/*  End Function _devfs_make_parent_for_leaf  */
-
-static devfs_handle_t _devfs_prepare_leaf(devfs_handle_t * dir,
-					  const char *name, umode_t mode)
-{
-	int namelen, leaf_pos;
-	struct devfs_entry *de;
-
-	namelen = strlen(name);
-	if ((*dir = _devfs_make_parent_for_leaf(*dir, name, namelen,
-						&leaf_pos)) == NULL) {
-		PRINTK("(%s): could not create parent path\n", name);
-		return NULL;
-	}
-	if ((de = _devfs_alloc_entry(name + leaf_pos, namelen - leaf_pos, mode))
-	    == NULL) {
-		PRINTK("(%s): could not allocate entry\n", name);
-		devfs_put(*dir);
-		return NULL;
-	}
-	return de;
-}				/*  End Function _devfs_prepare_leaf  */
-
-static devfs_handle_t _devfs_walk_path(struct devfs_entry *dir,
-				       const char *name, int namelen,
-				       int traverse_symlink)
-{
-	int next_pos = 0;
-
-	if (dir == NULL)
-		dir = _devfs_get_root_entry();
-	if (dir == NULL)
-		return NULL;
-	devfs_get(dir);
-	for (; namelen > 0; name += next_pos, namelen -= next_pos) {
-		struct devfs_entry *de, *link;
-
-		if (!S_ISDIR(dir->mode)) {
-			devfs_put(dir);
-			return NULL;
-		}
-
-		if ((de =
-		     _devfs_descend(dir, name, namelen, &next_pos)) == NULL) {
-			devfs_put(dir);
-			return NULL;
-		}
-		if (S_ISLNK(de->mode) && traverse_symlink) {	/*  Need to follow the link: this is a stack chomper  */
-			/* FIXME what if it puts outside of mounted tree? */
-			link = _devfs_walk_path(dir, de->u.symlink.linkname,
-						de->u.symlink.length, TRUE);
-			devfs_put(de);
-			if (!link) {
-				devfs_put(dir);
-				return NULL;
-			}
-			de = link;
-		}
-		devfs_put(dir);
-		dir = de;
-		if (name[next_pos] == '/')
-			++next_pos;
-	}
-	return dir;
-}				/*  End Function _devfs_walk_path  */
-
-/**
- *	_devfs_find_entry - Find a devfs entry.
- *	@dir: The handle to the parent devfs directory entry. If this is %NULL the
- *		name is relative to the root of the devfs.
- *	@name: The name of the entry. This may be %NULL.
- *	@traverse_symlink: If %TRUE then symbolic links are traversed.
- *
- *	Returns the devfs_entry pointer on success, else %NULL. An implicit
- *	devfs_get() is performed.
- */
-
-static struct devfs_entry *_devfs_find_entry(devfs_handle_t dir,
-					     const char *name,
-					     int traverse_symlink)
-{
-	unsigned int namelen = strlen(name);
-
-	if (name[0] == '/') {
-		/*  Skip leading pathname component  */
-		if (namelen < 2) {
-			PRINTK("(%s): too short\n", name);
-			return NULL;
-		}
-		for (++name, --namelen; (*name != '/') && (namelen > 0);
-		     ++name, --namelen) ;
-		if (namelen < 2) {
-			PRINTK("(%s): too short\n", name);
-			return NULL;
-		}
-		++name;
-		--namelen;
-	}
-	return _devfs_walk_path(dir, name, namelen, traverse_symlink);
-}				/*  End Function _devfs_find_entry  */
-
-static struct devfs_entry *get_devfs_entry_from_vfs_inode(struct inode *inode)
-{
-	if (inode == NULL)
-		return NULL;
-	VERIFY_ENTRY((struct devfs_entry *)inode->u.generic_ip);
-	return inode->u.generic_ip;
-}				/*  End Function get_devfs_entry_from_vfs_inode  */
-
-/**
- *	free_dentry - Free the dentry for a device entry and invalidate inode.
- *	@de: The entry.
- *
- *	This must only be called after the entry has been unhooked from its
- *	 parent directory.
- */
-
-static void free_dentry(struct devfs_entry *de)
-{
-	struct dentry *dentry = de->inode.dentry;
-
-	if (!dentry)
-		return;
-	spin_lock(&dcache_lock);
-	dget_locked(dentry);
-	spin_unlock(&dcache_lock);
-	/*  Forcefully remove the inode  */
-	if (dentry->d_inode != NULL)
-		dentry->d_inode->i_nlink = 0;
-	d_drop(dentry);
-	dput(dentry);
-}				/*  End Function free_dentry  */
-
-/**
- *	is_devfsd_or_child - Test if the current process is devfsd or one of its children.
- *	@fs_info: The filesystem information.
- *
- *	Returns %TRUE if devfsd or child, else %FALSE.
- */
-
-static int is_devfsd_or_child(struct fs_info *fs_info)
-{
-	struct task_struct *p = current;
-
-	if (p == fs_info->devfsd_task)
-		return (TRUE);
-	if (process_group(p) == fs_info->devfsd_pgrp)
-		return (TRUE);
-	read_lock(&tasklist_lock);
-	for (; p != &init_task; p = p->real_parent) {
-		if (p == fs_info->devfsd_task) {
-			read_unlock(&tasklist_lock);
-			return (TRUE);
-		}
-	}
-	read_unlock(&tasklist_lock);
-	return (FALSE);
-}				/*  End Function is_devfsd_or_child  */
-
-/**
- *	devfsd_queue_empty - Test if devfsd has work pending in its event queue.
- *	@fs_info: The filesystem information.
- *
- *	Returns %TRUE if the queue is empty, else %FALSE.
- */
-
-static inline int devfsd_queue_empty(struct fs_info *fs_info)
-{
-	return (fs_info->devfsd_last_event) ? FALSE : TRUE;
-}				/*  End Function devfsd_queue_empty  */
-
-/**
- *	wait_for_devfsd_finished - Wait for devfsd to finish processing its event queue.
- *	@fs_info: The filesystem information.
- *
- *	Returns %TRUE if no more waiting will be required, else %FALSE.
- */
-
-static int wait_for_devfsd_finished(struct fs_info *fs_info)
-{
-	DECLARE_WAITQUEUE(wait, current);
-
-	if (fs_info->devfsd_task == NULL)
-		return (TRUE);
-	if (devfsd_queue_empty(fs_info) && fs_info->devfsd_sleeping)
-		return TRUE;
-	if (is_devfsd_or_child(fs_info))
-		return (FALSE);
-	set_current_state(TASK_UNINTERRUPTIBLE);
-	add_wait_queue(&fs_info->revalidate_wait_queue, &wait);
-	if (!devfsd_queue_empty(fs_info) || !fs_info->devfsd_sleeping)
-		if (fs_info->devfsd_task)
-			schedule();
-	remove_wait_queue(&fs_info->revalidate_wait_queue, &wait);
-	__set_current_state(TASK_RUNNING);
-	return (TRUE);
-}				/*  End Function wait_for_devfsd_finished  */
-
-/**
- *	devfsd_notify_de - Notify the devfsd daemon of a change.
- *	@de: The devfs entry that has changed. This and all parent entries will
- *            have their reference counts incremented if the event was queued.
- *	@type: The type of change.
- *	@mode: The mode of the entry.
- *	@uid: The user ID.
- *	@gid: The group ID.
- *	@fs_info: The filesystem info.
- *
- *	Returns %TRUE if an event was queued and devfsd woken up, else %FALSE.
- */
-
-static int devfsd_notify_de(struct devfs_entry *de,
-			    unsigned short type, umode_t mode,
-			    uid_t uid, gid_t gid, struct fs_info *fs_info)
-{
-	struct devfsd_buf_entry *entry;
-	struct devfs_entry *curr;
-
-	if (!(fs_info->devfsd_event_mask & (1 << type)))
-		return (FALSE);
-	if ((entry = kmem_cache_alloc(devfsd_buf_cache, SLAB_KERNEL)) == NULL) {
-		atomic_inc(&fs_info->devfsd_overrun_count);
-		return (FALSE);
-	}
-	for (curr = de; curr != NULL; curr = curr->parent)
-		devfs_get(curr);
-	entry->de = de;
-	entry->type = type;
-	entry->mode = mode;
-	entry->uid = uid;
-	entry->gid = gid;
-	entry->next = NULL;
-	spin_lock(&fs_info->devfsd_buffer_lock);
-	if (!fs_info->devfsd_first_event)
-		fs_info->devfsd_first_event = entry;
-	if (fs_info->devfsd_last_event)
-		fs_info->devfsd_last_event->next = entry;
-	fs_info->devfsd_last_event = entry;
-	spin_unlock(&fs_info->devfsd_buffer_lock);
-	wake_up_interruptible(&fs_info->devfsd_wait_queue);
-	return (TRUE);
-}				/*  End Function devfsd_notify_de  */
-
-/**
- *	devfsd_notify - Notify the devfsd daemon of a change.
- *	@de: The devfs entry that has changed.
- *	@type: The type of change event.
- *	@wait: If TRUE, the function waits for the daemon to finish processing
- *		the event.
- */
-
-static void devfsd_notify(struct devfs_entry *de, unsigned short type)
-{
-	devfsd_notify_de(de, type, de->mode, current->euid,
-			 current->egid, &fs_info);
-}
-
-static int devfs_mk_dev(dev_t dev, umode_t mode, const char *fmt, va_list args)
-{
-	struct devfs_entry *dir = NULL, *de;
-	char buf[64];
-	int error, n;
-
-	n = vsnprintf(buf, sizeof(buf), fmt, args);
-	if (n >= sizeof(buf) || !buf[0]) {
-		printk(KERN_WARNING "%s: invalid format string %s\n",
-		       __FUNCTION__, fmt);
-		return -EINVAL;
-	}
-
-	de = _devfs_prepare_leaf(&dir, buf, mode);
-	if (!de) {
-		printk(KERN_WARNING "%s: could not prepare leaf for %s\n",
-		       __FUNCTION__, buf);
-		return -ENOMEM;	/* could be more accurate... */
-	}
-
-	de->u.dev = dev;
-
-	error = _devfs_append_entry(dir, de, NULL);
-	if (error) {
-		printk(KERN_WARNING "%s: could not append to parent for %s\n",
-		       __FUNCTION__, buf);
-		goto out;
-	}
-
-	devfsd_notify(de, DEVFSD_NOTIFY_REGISTERED);
-      out:
-	devfs_put(dir);
-	return error;
-}
-
-int devfs_mk_bdev(dev_t dev, umode_t mode, const char *fmt, ...)
-{
-	va_list args;
-
-	if (!S_ISBLK(mode)) {
-		printk(KERN_WARNING "%s: invalide mode (%u) for %s\n",
-		       __FUNCTION__, mode, fmt);
-		return -EINVAL;
-	}
-
-	va_start(args, fmt);
-	return devfs_mk_dev(dev, mode, fmt, args);
-}
-
-EXPORT_SYMBOL(devfs_mk_bdev);
-
-int devfs_mk_cdev(dev_t dev, umode_t mode, const char *fmt, ...)
-{
-	va_list args;
-
-	if (!S_ISCHR(mode)) {
-		printk(KERN_WARNING "%s: invalide mode (%u) for %s\n",
-		       __FUNCTION__, mode, fmt);
-		return -EINVAL;
-	}
-
-	va_start(args, fmt);
-	return devfs_mk_dev(dev, mode, fmt, args);
-}
-
-EXPORT_SYMBOL(devfs_mk_cdev);
-
-/**
- *	_devfs_unhook - Unhook a device entry from its parents list
- *	@de: The entry to unhook.
- *
- *	Returns %TRUE if the entry was unhooked, else %FALSE if it was
- *		previously unhooked.
- *	The caller must have a write lock on the parent directory.
- */
-
-static int _devfs_unhook(struct devfs_entry *de)
-{
-	struct devfs_entry *parent;
-
-	if (!de || (de->prev == de))
-		return FALSE;
-	parent = de->parent;
-	if (de->prev == NULL)
-		parent->u.dir.first = de->next;
-	else
-		de->prev->next = de->next;
-	if (de->next == NULL)
-		parent->u.dir.last = de->prev;
-	else
-		de->next->prev = de->prev;
-	de->prev = de;		/*  Indicate we're unhooked                      */
-	de->next = NULL;	/*  Force early termination for <devfs_readdir>  */
-	return TRUE;
-}				/*  End Function _devfs_unhook  */
-
-/**
- *	_devfs_unregister - Unregister a device entry from its parent.
- *	@dir: The parent directory.
- *	@de: The entry to unregister.
- *
- *	The caller must have a write lock on the parent directory, which is
- *	unlocked by this function.
- */
-
-static void _devfs_unregister(struct devfs_entry *dir, struct devfs_entry *de)
-{
-	int unhooked = _devfs_unhook(de);
-
-	write_unlock(&dir->u.dir.lock);
-	if (!unhooked)
-		return;
-	devfs_get(dir);
-	devfsd_notify(de, DEVFSD_NOTIFY_UNREGISTERED);
-	free_dentry(de);
-	devfs_put(dir);
-	if (!S_ISDIR(de->mode))
-		return;
-	while (TRUE) {		/*  Recursively unregister: this is a stack chomper  */
-		struct devfs_entry *child;
-
-		write_lock(&de->u.dir.lock);
-		de->u.dir.no_more_additions = TRUE;
-		child = de->u.dir.first;
-		VERIFY_ENTRY(child);
-		_devfs_unregister(de, child);
-		if (!child)
-			break;
-		DPRINTK(DEBUG_UNREGISTER, "(%s): child: %p  refcount: %d\n",
-			child->name, child, atomic_read(&child->refcount));
-		devfs_put(child);
-	}
-}				/*  End Function _devfs_unregister  */
-
-static int devfs_do_symlink(devfs_handle_t dir, const char *name,
-			    const char *link, devfs_handle_t * handle)
-{
-	int err;
-	unsigned int linklength;
-	char *newlink;
-	struct devfs_entry *de;
-
-	if (handle != NULL)
-		*handle = NULL;
-	if (name == NULL) {
-		PRINTK("(): NULL name pointer\n");
-		return -EINVAL;
-	}
-	if (link == NULL) {
-		PRINTK("(%s): NULL link pointer\n", name);
-		return -EINVAL;
-	}
-	linklength = strlen(link);
-	if ((newlink = kmalloc(linklength + 1, GFP_KERNEL)) == NULL)
-		return -ENOMEM;
-	memcpy(newlink, link, linklength);
-	newlink[linklength] = '\0';
-	if ((de = _devfs_prepare_leaf(&dir, name, S_IFLNK | S_IRUGO | S_IXUGO))
-	    == NULL) {
-		PRINTK("(%s): could not prepare leaf\n", name);
-		kfree(newlink);
-		return -ENOTDIR;
-	}
-	de->info = NULL;
-	de->u.symlink.linkname = newlink;
-	de->u.symlink.length = linklength;
-	if ((err = _devfs_append_entry(dir, de, NULL)) != 0) {
-		PRINTK("(%s): could not append to parent, err: %d\n", name,
-		       err);
-		devfs_put(dir);
-		return err;
-	}
-	devfs_put(dir);
-#ifdef CONFIG_DEVFS_DEBUG
-	spin_lock(&stat_lock);
-	stat_num_bytes += linklength + 1;
-	spin_unlock(&stat_lock);
-#endif
-	if (handle != NULL)
-		*handle = de;
-	return 0;
-}				/*  End Function devfs_do_symlink  */
-
-/**
- *	devfs_mk_symlink Create a symbolic link in the devfs namespace.
- *	@from: The name of the entry.
- *	@to: Name of the destination
- *
- *	Returns 0 on success, else a negative error code is returned.
- */
-
-int devfs_mk_symlink(const char *from, const char *to)
-{
-	devfs_handle_t de;
-	int err;
-
-	err = devfs_do_symlink(NULL, from, to, &de);
-	if (!err) {
-		de->vfs = TRUE;
-		devfsd_notify(de, DEVFSD_NOTIFY_REGISTERED);
-	}
-
-	return err;
-}
-
-/**
- *	devfs_mk_dir - Create a directory in the devfs namespace.
- *		new name is relative to the root of the devfs.
- *	@fmt: The name of the entry.
- *
- *	Use of this function is optional. The devfs_register() function
- *	will automatically create intermediate directories as needed. This function
- *	is provided for efficiency reasons, as it provides a handle to a directory.
- *	On failure %NULL is returned.
- */
-
-int devfs_mk_dir(const char *fmt, ...)
-{
-	struct devfs_entry *dir = NULL, *de = NULL, *old;
-	char buf[64];
-	va_list args;
-	int error, n;
-
-	va_start(args, fmt);
-	n = vsnprintf(buf, 64, fmt, args);
-	if (n >= 64 || !buf[0]) {
-		printk(KERN_WARNING "%s: invalid argument.", __FUNCTION__);
-		return -EINVAL;
-	}
-
-	de = _devfs_prepare_leaf(&dir, buf, MODE_DIR);
-	if (!de) {
-		PRINTK("(%s): could not prepare leaf\n", buf);
-		return -EINVAL;
-	}
-
-	error = _devfs_append_entry(dir, de, &old);
-	if (error == -EEXIST && S_ISDIR(old->mode)) {
-		/*
-		 * devfs_mk_dir() of an already-existing directory will
-		 * return success.
-		 */
-		error = 0;
-		goto out_put;
-	} else if (error) {
-		PRINTK("(%s): could not append to dir: %p \"%s\"\n",
-		       buf, dir, dir->name);
-		devfs_put(old);
-		goto out_put;
-	}
-
-	devfsd_notify(de, DEVFSD_NOTIFY_REGISTERED);
-
-      out_put:
-	devfs_put(dir);
-	return error;
-}
-
-void devfs_remove(const char *fmt, ...)
-{
-	char buf[64];
-	va_list args;
-	int n;
-
-	va_start(args, fmt);
-	n = vsnprintf(buf, sizeof(buf), fmt, args);
-	if (n < sizeof(buf) && buf[0]) {
-		devfs_handle_t de = _devfs_find_entry(NULL, buf, 0);
-
-		if (!de) {
-			printk(KERN_ERR "%s: %s not found, cannot remove\n",
-			       __FUNCTION__, buf);
-			dump_stack();
-			return;
-		}
-
-		write_lock(&de->parent->u.dir.lock);
-		_devfs_unregister(de->parent, de);
-		devfs_put(de);
-		devfs_put(de);
-	}
-}
-
-/**
- *	devfs_generate_path - Generate a pathname for an entry, relative to the devfs root.
- *	@de: The devfs entry.
- *	@path: The buffer to write the pathname to. The pathname and '\0'
- *		terminator will be written at the end of the buffer.
- *	@buflen: The length of the buffer.
- *
- *	Returns the offset in the buffer where the pathname starts on success,
- *	else a negative error code.
- */
-
-static int devfs_generate_path(devfs_handle_t de, char *path, int buflen)
-{
-	int pos;
-#define NAMEOF(de) ( (de)->mode ? (de)->name : (de)->u.name )
-
-	if (de == NULL)
-		return -EINVAL;
-	VERIFY_ENTRY(de);
-	if (de->namelen >= buflen)
-		return -ENAMETOOLONG;	/*  Must be first       */
-	path[buflen - 1] = '\0';
-	if (de->parent == NULL)
-		return buflen - 1;	/*  Don't prepend root  */
-	pos = buflen - de->namelen - 1;
-	memcpy(path + pos, NAMEOF(de), de->namelen);
-	for (de = de->parent; de->parent != NULL; de = de->parent) {
-		if (pos - de->namelen - 1 < 0)
-			return -ENAMETOOLONG;
-		path[--pos] = '/';
-		pos -= de->namelen;
-		memcpy(path + pos, NAMEOF(de), de->namelen);
-	}
-	return pos;
-}				/*  End Function devfs_generate_path  */
-
-/**
- *	devfs_setup - Process kernel boot options.
- *	@str: The boot options after the "devfs=".
- */
-
-static int __init devfs_setup(char *str)
-{
-	static struct {
-		char *name;
-		unsigned int mask;
-		unsigned int *opt;
-	} devfs_options_tab[] __initdata = {
-#ifdef CONFIG_DEVFS_DEBUG
-		{
-		"dall", DEBUG_ALL, &devfs_debug_init}, {
-		"dmod", DEBUG_MODULE_LOAD, &devfs_debug_init}, {
-		"dreg", DEBUG_REGISTER, &devfs_debug_init}, {
-		"dunreg", DEBUG_UNREGISTER, &devfs_debug_init}, {
-		"dfree", DEBUG_FREE, &devfs_debug_init}, {
-		"diget", DEBUG_I_GET, &devfs_debug_init}, {
-		"dchange", DEBUG_SET_FLAGS, &devfs_debug_init}, {
-		"dsread", DEBUG_S_READ, &devfs_debug_init}, {
-		"dichange", DEBUG_I_CHANGE, &devfs_debug_init}, {
-		"dimknod", DEBUG_I_MKNOD, &devfs_debug_init}, {
-		"dilookup", DEBUG_I_LOOKUP, &devfs_debug_init}, {
-		"diunlink", DEBUG_I_UNLINK, &devfs_debug_init},
-#endif				/*  CONFIG_DEVFS_DEBUG  */
-		{
-		"mount", OPTION_MOUNT, &boot_options}, {
-		NULL, 0, NULL}
-	};
-
-	while ((*str != '\0') && !isspace(*str)) {
-		int i, found = 0, invert = 0;
-
-		if (strncmp(str, "no", 2) == 0) {
-			invert = 1;
-			str += 2;
-		}
-		for (i = 0; devfs_options_tab[i].name != NULL; i++) {
-			int len = strlen(devfs_options_tab[i].name);
-
-			if (strncmp(str, devfs_options_tab[i].name, len) == 0) {
-				if (invert)
-					*devfs_options_tab[i].opt &=
-					    ~devfs_options_tab[i].mask;
-				else
-					*devfs_options_tab[i].opt |=
-					    devfs_options_tab[i].mask;
-				str += len;
-				found = 1;
-				break;
-			}
-		}
-		if (!found)
-			return 0;	/*  No match         */
-		if (*str != ',')
-			return 0;	/*  No more options  */
-		++str;
-	}
-	return 1;
-}				/*  End Function devfs_setup  */
-
-__setup("devfs=", devfs_setup);
-
-EXPORT_SYMBOL(devfs_mk_dir);
-EXPORT_SYMBOL(devfs_remove);
-
-/**
- *	try_modload - Notify devfsd of an inode lookup by a non-devfsd process.
- *	@parent: The parent devfs entry.
- *	@fs_info: The filesystem info.
- *	@name: The device name.
- *	@namelen: The number of characters in @name.
- *	@buf: A working area that will be used. This must not go out of scope
- *            until devfsd is idle again.
- *
- *	Returns 0 on success (event was queued), else a negative error code.
- */
-
-static int try_modload(struct devfs_entry *parent, struct fs_info *fs_info,
-		       const char *name, unsigned namelen,
-		       struct devfs_entry *buf)
-{
-	if (!(fs_info->devfsd_event_mask & (1 << DEVFSD_NOTIFY_LOOKUP)))
-		return -ENOENT;
-	if (is_devfsd_or_child(fs_info))
-		return -ENOENT;
-	memset(buf, 0, sizeof *buf);
-	atomic_set(&buf->refcount, 1);
-	buf->parent = parent;
-	buf->namelen = namelen;
-	buf->u.name = name;
-	WRITE_ENTRY_MAGIC(buf, MAGIC_VALUE);
-	if (!devfsd_notify_de(buf, DEVFSD_NOTIFY_LOOKUP, 0,
-			      current->euid, current->egid, fs_info))
-		return -ENOENT;
-	/*  Possible success: event has been queued  */
-	return 0;
-}				/*  End Function try_modload  */
-
-/*  Superblock operations follow  */
-
-static struct inode_operations devfs_iops;
-static struct inode_operations devfs_dir_iops;
-static const struct file_operations devfs_fops;
-static const struct file_operations devfs_dir_fops;
-static struct inode_operations devfs_symlink_iops;
-
-static int devfs_notify_change(struct dentry *dentry, struct iattr *iattr)
-{
-	int retval;
-	struct devfs_entry *de;
-	struct inode *inode = dentry->d_inode;
-	struct fs_info *fs_info = inode->i_sb->s_fs_info;
-
-	de = get_devfs_entry_from_vfs_inode(inode);
-	if (de == NULL)
-		return -ENODEV;
-	retval = inode_change_ok(inode, iattr);
-	if (retval != 0)
-		return retval;
-	retval = inode_setattr(inode, iattr);
-	if (retval != 0)
-		return retval;
-	DPRINTK(DEBUG_I_CHANGE, "(%d): VFS inode: %p  devfs_entry: %p\n",
-		(int)inode->i_ino, inode, de);
-	DPRINTK(DEBUG_I_CHANGE, "():   mode: 0%o  uid: %d  gid: %d\n",
-		(int)inode->i_mode, (int)inode->i_uid, (int)inode->i_gid);
-	/*  Inode is not on hash chains, thus must save permissions here rather
-	   than in a write_inode() method  */
-	de->mode = inode->i_mode;
-	de->inode.uid = inode->i_uid;
-	de->inode.gid = inode->i_gid;
-	de->inode.atime = inode->i_atime;
-	de->inode.mtime = inode->i_mtime;
-	de->inode.ctime = inode->i_ctime;
-	if ((iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID)) &&
-	    !is_devfsd_or_child(fs_info))
-		devfsd_notify_de(de, DEVFSD_NOTIFY_CHANGE, inode->i_mode,
-				 inode->i_uid, inode->i_gid, fs_info);
-	return 0;
-}				/*  End Function devfs_notify_change  */
-
-static struct super_operations devfs_sops = {
-	.drop_inode = generic_delete_inode,
-	.statfs = simple_statfs,
-};
-
-/**
- *	_devfs_get_vfs_inode - Get a VFS inode.
- *	@sb: The super block.
- *	@de: The devfs inode.
- *	@dentry: The dentry to register with the devfs inode.
- *
- *	Returns the inode on success, else %NULL. An implicit devfs_get() is
- *       performed if the inode is created.
- */
-
-static struct inode *_devfs_get_vfs_inode(struct super_block *sb,
-					  struct devfs_entry *de,
-					  struct dentry *dentry)
-{
-	struct inode *inode;
-
-	if (de->prev == de)
-		return NULL;	/*  Quick check to see if unhooked  */
-	if ((inode = new_inode(sb)) == NULL) {
-		PRINTK("(%s): new_inode() failed, de: %p\n", de->name, de);
-		return NULL;
-	}
-	if (de->parent) {
-		read_lock(&de->parent->u.dir.lock);
-		if (de->prev != de)
-			de->inode.dentry = dentry;	/*      Not unhooked  */
-		read_unlock(&de->parent->u.dir.lock);
-	} else
-		de->inode.dentry = dentry;	/*  Root: no locking needed  */
-	if (de->inode.dentry != dentry) {	/*  Must have been unhooked  */
-		iput(inode);
-		return NULL;
-	}
-	/* FIXME where is devfs_put? */
-	inode->u.generic_ip = devfs_get(de);
-	inode->i_ino = de->inode.ino;
-	DPRINTK(DEBUG_I_GET, "(%d): VFS inode: %p  devfs_entry: %p\n",
-		(int)inode->i_ino, inode, de);
-	inode->i_blocks = 0;
-	inode->i_blksize = FAKE_BLOCK_SIZE;
-	inode->i_op = &devfs_iops;
-	inode->i_mode = de->mode;
-	if (S_ISDIR(de->mode)) {
-		inode->i_op = &devfs_dir_iops;
-		inode->i_fop = &devfs_dir_fops;
-	} else if (S_ISLNK(de->mode)) {
-		inode->i_op = &devfs_symlink_iops;
-		inode->i_size = de->u.symlink.length;
-	} else if (S_ISCHR(de->mode) || S_ISBLK(de->mode)) {
-		init_special_inode(inode, de->mode, de->u.dev);
-	} else if (S_ISFIFO(de->mode) || S_ISSOCK(de->mode)) {
-		init_special_inode(inode, de->mode, 0);
-	} else {
-		PRINTK("(%s): unknown mode %o de: %p\n",
-		       de->name, de->mode, de);
-		iput(inode);
-		devfs_put(de);
-		return NULL;
-	}
-
-	inode->i_uid = de->inode.uid;
-	inode->i_gid = de->inode.gid;
-	inode->i_atime = de->inode.atime;
-	inode->i_mtime = de->inode.mtime;
-	inode->i_ctime = de->inode.ctime;
-	DPRINTK(DEBUG_I_GET, "():   mode: 0%o  uid: %d  gid: %d\n",
-		(int)inode->i_mode, (int)inode->i_uid, (int)inode->i_gid);
-	return inode;
-}				/*  End Function _devfs_get_vfs_inode  */
-
-/*  File operations for device entries follow  */
-
-static int devfs_readdir(struct file *file, void *dirent, filldir_t filldir)
-{
-	int err, count;
-	int stored = 0;
-	struct fs_info *fs_info;
-	struct devfs_entry *parent, *de, *next = NULL;
-	struct inode *inode = file->f_dentry->d_inode;
-
-	fs_info = inode->i_sb->s_fs_info;
-	parent = get_devfs_entry_from_vfs_inode(file->f_dentry->d_inode);
-	if ((long)file->f_pos < 0)
-		return -EINVAL;
-	DPRINTK(DEBUG_F_READDIR, "(%s): fs_info: %p  pos: %ld\n",
-		parent->name, fs_info, (long)file->f_pos);
-	switch ((long)file->f_pos) {
-	case 0:
-		err = (*filldir) (dirent, "..", 2, file->f_pos,
-				  parent_ino(file->f_dentry), DT_DIR);
-		if (err == -EINVAL)
-			break;
-		if (err < 0)
-			return err;
-		file->f_pos++;
-		++stored;
-		/*  Fall through  */
-	case 1:
-		err =
-		    (*filldir) (dirent, ".", 1, file->f_pos, inode->i_ino,
-				DT_DIR);
-		if (err == -EINVAL)
-			break;
-		if (err < 0)
-			return err;
-		file->f_pos++;
-		++stored;
-		/*  Fall through  */
-	default:
-		/*  Skip entries  */
-		count = file->f_pos - 2;
-		read_lock(&parent->u.dir.lock);
-		for (de = parent->u.dir.first; de && (count > 0); de = de->next)
-			--count;
-		devfs_get(de);
-		read_unlock(&parent->u.dir.lock);
-		/*  Now add all remaining entries  */
-		while (de) {
-			err = (*filldir) (dirent, de->name, de->namelen,
-					  file->f_pos, de->inode.ino,
-					  de->mode >> 12);
-			if (err < 0)
-				devfs_put(de);
-			else {
-				file->f_pos++;
-				++stored;
-			}
-			if (err == -EINVAL)
-				break;
-			if (err < 0)
-				return err;
-			read_lock(&parent->u.dir.lock);
-			next = devfs_get(de->next);
-			read_unlock(&parent->u.dir.lock);
-			devfs_put(de);
-			de = next;
-		}
-		break;
-	}
-	return stored;
-}				/*  End Function devfs_readdir  */
-
-/* Open devfs specific special files */
-static int devfs_open(struct inode *inode, struct file *file)
-{
-	int err;
-	int minor = MINOR(inode->i_rdev);
-	struct file_operations *old_fops, *new_fops;
-
-	switch (minor) {
-	case 0:		/* /dev/.devfsd */
-		new_fops = fops_get(&devfsd_fops);
-		break;
-#ifdef CONFIG_DEVFS_DEBUG
-	case 1:		/* /dev/.stat */
-		new_fops = fops_get(&stat_fops);
-		break;
-#endif
-	default:
-		return -ENODEV;
-	}
-
-	if (new_fops == NULL)
-		return -ENODEV;
-	old_fops = file->f_op;
-	file->f_op = new_fops;
-	err = new_fops->open ? new_fops->open(inode, file) : 0;
-	if (err) {
-		file->f_op = old_fops;
-		fops_put(new_fops);
-	} else
-		fops_put(old_fops);
-	return err;
-}				/*  End Function devfs_open  */
-
-static const struct file_operations devfs_fops = {
-	.open = devfs_open,
-};
-
-static const struct file_operations devfs_dir_fops = {
-	.read = generic_read_dir,
-	.readdir = devfs_readdir,
-};
-
-/*  Dentry operations for device entries follow  */
-
-/**
- *	devfs_d_release - Callback for when a dentry is freed.
- *	@dentry: The dentry.
- */
-
-static void devfs_d_release(struct dentry *dentry)
-{
-	DPRINTK(DEBUG_D_RELEASE, "(%p): inode: %p\n", dentry, dentry->d_inode);
-}				/*  End Function devfs_d_release  */
-
-/**
- *	devfs_d_iput - Callback for when a dentry loses its inode.
- *	@dentry: The dentry.
- *	@inode:	The inode.
- */
-
-static void devfs_d_iput(struct dentry *dentry, struct inode *inode)
-{
-	struct devfs_entry *de;
-
-	de = get_devfs_entry_from_vfs_inode(inode);
-	DPRINTK(DEBUG_D_IPUT,
-		"(%s): dentry: %p inode: %p de: %p de->dentry: %p\n", de->name,
-		dentry, inode, de, de->inode.dentry);
-	if (de->inode.dentry && (de->inode.dentry != dentry))
-		OOPS("(%s): de: %p dentry: %p de->dentry: %p\n",
-		     de->name, de, dentry, de->inode.dentry);
-	de->inode.dentry = NULL;
-	iput(inode);
-	devfs_put(de);
-}				/*  End Function devfs_d_iput  */
-
-static int devfs_d_delete(struct dentry *dentry);
-
-static struct dentry_operations devfs_dops = {
-	.d_delete = devfs_d_delete,
-	.d_release = devfs_d_release,
-	.d_iput = devfs_d_iput,
-};
-
-static int devfs_d_revalidate_wait(struct dentry *dentry, struct nameidata *);
-
-static struct dentry_operations devfs_wait_dops = {
-	.d_delete = devfs_d_delete,
-	.d_release = devfs_d_release,
-	.d_iput = devfs_d_iput,
-	.d_revalidate = devfs_d_revalidate_wait,
-};
-
-/**
- *	devfs_d_delete - Callback for when all files for a dentry are closed.
- *	@dentry: The dentry.
- */
-
-static int devfs_d_delete(struct dentry *dentry)
-{
-	struct inode *inode = dentry->d_inode;
-
-	if (dentry->d_op == &devfs_wait_dops)
-		dentry->d_op = &devfs_dops;
-	/*  Unhash dentry if negative (has no inode)  */
-	if (inode == NULL) {
-		DPRINTK(DEBUG_D_DELETE, "(%p): dropping negative dentry\n",
-			dentry);
-		return 1;
-	}
-	return 0;
-}				/*  End Function devfs_d_delete  */
-
-struct devfs_lookup_struct {
-	devfs_handle_t de;
-	wait_queue_head_t wait_queue;
-};
-
-/* XXX: this doesn't handle the case where we got a negative dentry
-        but a devfs entry has been registered in the meanwhile */
-static int devfs_d_revalidate_wait(struct dentry *dentry, struct nameidata *nd)
-{
-	struct inode *dir = dentry->d_parent->d_inode;
-	struct fs_info *fs_info = dir->i_sb->s_fs_info;
-	devfs_handle_t parent = get_devfs_entry_from_vfs_inode(dir);
-	struct devfs_lookup_struct *lookup_info = dentry->d_fsdata;
-	DECLARE_WAITQUEUE(wait, current);
-	int need_lock;
-
-	/*
-	 * FIXME HACK
-	 *
-	 * make sure that
-	 *   d_instantiate always runs under lock
-	 *   we release i_mutex lock before going to sleep
-	 *
-	 * unfortunately sometimes d_revalidate is called with
-	 * and sometimes without i_mutex lock held. The following checks
-	 * attempt to deduce when we need to add (and drop resp.) lock
-	 * here. This relies on current (2.6.2) calling coventions:
-	 *
-	 *   lookup_hash is always run under i_mutex and is passing NULL
-	 *   as nd
-	 *
-	 *   open(...,O_CREATE,...) calls _lookup_hash under i_mutex
-	 *   and sets flags to LOOKUP_OPEN|LOOKUP_CREATE
-	 *
-	 *   all other invocations of ->d_revalidate seem to happen
-	 *   outside of i_mutex
-	 */
-	need_lock = nd &&
-	    (!(nd->flags & LOOKUP_CREATE) || (nd->flags & LOOKUP_PARENT));
-
-	if (need_lock)
-		mutex_lock(&dir->i_mutex);
-
-	if (is_devfsd_or_child(fs_info)) {
-		devfs_handle_t de = lookup_info->de;
-		struct inode *inode;
-
-		DPRINTK(DEBUG_I_LOOKUP,
-			"(%s): dentry: %p inode: %p de: %p by: \"%s\"\n",
-			dentry->d_name.name, dentry, dentry->d_inode, de,
-			current->comm);
-		if (dentry->d_inode)
-			goto out;
-		if (de == NULL) {
-			read_lock(&parent->u.dir.lock);
-			de = _devfs_search_dir(parent, dentry->d_name.name,
-					       dentry->d_name.len);
-			read_unlock(&parent->u.dir.lock);
-			if (de == NULL)
-				goto out;
-			lookup_info->de = de;
-		}
-		/*  Create an inode, now that the driver information is available  */
-		inode = _devfs_get_vfs_inode(dir->i_sb, de, dentry);
-		if (!inode)
-			goto out;
-		DPRINTK(DEBUG_I_LOOKUP,
-			"(%s): new VFS inode(%u): %p de: %p by: \"%s\"\n",
-			de->name, de->inode.ino, inode, de, current->comm);
-		d_instantiate(dentry, inode);
-		goto out;
-	}
-	if (lookup_info == NULL)
-		goto out;	/*  Early termination  */
-	read_lock(&parent->u.dir.lock);
-	if (dentry->d_fsdata) {
-		set_current_state(TASK_UNINTERRUPTIBLE);
-		add_wait_queue(&lookup_info->wait_queue, &wait);
-		read_unlock(&parent->u.dir.lock);
-		/* at this point it is always (hopefully) locked */
-		mutex_unlock(&dir->i_mutex);
-		schedule();
-		mutex_lock(&dir->i_mutex);
-		/*
-		 * This does not need nor should remove wait from wait_queue.
-		 * Wait queue head is never reused - nothing is ever added to it
-		 * after all waiters have been waked up and head itself disappears
-		 * very soon after it. Moreover it is local variable on stack that
-		 * is likely to have already disappeared so any reference to it
-		 * at this point is buggy.
-		 */
-
-	} else
-		read_unlock(&parent->u.dir.lock);
-
-      out:
-	if (need_lock)
-		mutex_unlock(&dir->i_mutex);
-	return 1;
-}				/*  End Function devfs_d_revalidate_wait  */
-
-/*  Inode operations for device entries follow  */
-
-static struct dentry *devfs_lookup(struct inode *dir, struct dentry *dentry,
-				   struct nameidata *nd)
-{
-	struct devfs_entry tmp;	/*  Must stay in scope until devfsd idle again  */
-	struct devfs_lookup_struct lookup_info;
-	struct fs_info *fs_info = dir->i_sb->s_fs_info;
-	struct devfs_entry *parent, *de;
-	struct inode *inode;
-	struct dentry *retval = NULL;
-
-	/*  Set up the dentry operations before anything else, to ensure cleaning
-	   up on any error  */
-	dentry->d_op = &devfs_dops;
-	/*  First try to get the devfs entry for this directory  */
-	parent = get_devfs_entry_from_vfs_inode(dir);
-	DPRINTK(DEBUG_I_LOOKUP, "(%s): dentry: %p parent: %p by: \"%s\"\n",
-		dentry->d_name.name, dentry, parent, current->comm);
-	if (parent == NULL)
-		return ERR_PTR(-ENOENT);
-	read_lock(&parent->u.dir.lock);
-	de = _devfs_search_dir(parent, dentry->d_name.name, dentry->d_name.len);
-	read_unlock(&parent->u.dir.lock);
-	lookup_info.de = de;
-	init_waitqueue_head(&lookup_info.wait_queue);
-	dentry->d_fsdata = &lookup_info;
-	if (de == NULL) {	/*  Try with devfsd. For any kind of failure, leave a negative dentry
-				   so someone else can deal with it (in the case where the sysadmin
-				   does a mknod()). It's important to do this before hashing the
-				   dentry, so that the devfsd queue is filled before revalidates
-				   can start  */
-		if (try_modload(parent, fs_info, dentry->d_name.name, dentry->d_name.len, &tmp) < 0) {	/*  Lookup event was not queued to devfsd  */
-			d_add(dentry, NULL);
-			return NULL;
-		}
-	}
-	dentry->d_op = &devfs_wait_dops;
-	d_add(dentry, NULL);	/*  Open the floodgates  */
-	/*  Unlock directory semaphore, which will release any waiters. They
-	   will get the hashed dentry, and may be forced to wait for
-	   revalidation  */
-	mutex_unlock(&dir->i_mutex);
-	wait_for_devfsd_finished(fs_info);	/*  If I'm not devfsd, must wait  */
-	mutex_lock(&dir->i_mutex);	/*  Grab it again because them's the rules  */
-	de = lookup_info.de;
-	/*  If someone else has been so kind as to make the inode, we go home
-	   early  */
-	if (dentry->d_inode)
-		goto out;
-	if (de == NULL) {
-		read_lock(&parent->u.dir.lock);
-		de = _devfs_search_dir(parent, dentry->d_name.name,
-				       dentry->d_name.len);
-		read_unlock(&parent->u.dir.lock);
-		if (de == NULL)
-			goto out;
-		/*  OK, there's an entry now, but no VFS inode yet  */
-	}
-	/*  Create an inode, now that the driver information is available  */
-	inode = _devfs_get_vfs_inode(dir->i_sb, de, dentry);
-	if (!inode) {
-		retval = ERR_PTR(-ENOMEM);
-		goto out;
-	}
-	DPRINTK(DEBUG_I_LOOKUP,
-		"(%s): new VFS inode(%u): %p de: %p by: \"%s\"\n", de->name,
-		de->inode.ino, inode, de, current->comm);
-	d_instantiate(dentry, inode);
-      out:
-	write_lock(&parent->u.dir.lock);
-	dentry->d_op = &devfs_dops;
-	dentry->d_fsdata = NULL;
-	wake_up(&lookup_info.wait_queue);
-	write_unlock(&parent->u.dir.lock);
-	devfs_put(de);
-	return retval;
-}				/*  End Function devfs_lookup  */
-
-static int devfs_unlink(struct inode *dir, struct dentry *dentry)
-{
-	int unhooked;
-	struct devfs_entry *de;
-	struct inode *inode = dentry->d_inode;
-	struct fs_info *fs_info = dir->i_sb->s_fs_info;
-
-	de = get_devfs_entry_from_vfs_inode(inode);
-	DPRINTK(DEBUG_I_UNLINK, "(%s): de: %p\n", dentry->d_name.name, de);
-	if (de == NULL)
-		return -ENOENT;
-	if (!de->vfs)
-		return -EPERM;
-	write_lock(&de->parent->u.dir.lock);
-	unhooked = _devfs_unhook(de);
-	write_unlock(&de->parent->u.dir.lock);
-	if (!unhooked)
-		return -ENOENT;
-	if (!is_devfsd_or_child(fs_info))
-		devfsd_notify_de(de, DEVFSD_NOTIFY_DELETE, inode->i_mode,
-				 inode->i_uid, inode->i_gid, fs_info);
-	free_dentry(de);
-	devfs_put(de);
-	return 0;
-}				/*  End Function devfs_unlink  */
-
-static int devfs_symlink(struct inode *dir, struct dentry *dentry,
-			 const char *symname)
-{
-	int err;
-	struct fs_info *fs_info = dir->i_sb->s_fs_info;
-	struct devfs_entry *parent, *de;
-	struct inode *inode;
-
-	/*  First try to get the devfs entry for this directory  */
-	parent = get_devfs_entry_from_vfs_inode(dir);
-	if (parent == NULL)
-		return -ENOENT;
-	err = devfs_do_symlink(parent, dentry->d_name.name, symname, &de);
-	DPRINTK(DEBUG_DISABLED, "(%s): errcode from <devfs_do_symlink>: %d\n",
-		dentry->d_name.name, err);
-	if (err < 0)
-		return err;
-	de->vfs = TRUE;
-	de->inode.uid = current->euid;
-	de->inode.gid = current->egid;
-	de->inode.atime = CURRENT_TIME;
-	de->inode.mtime = CURRENT_TIME;
-	de->inode.ctime = CURRENT_TIME;
-	if ((inode = _devfs_get_vfs_inode(dir->i_sb, de, dentry)) == NULL)
-		return -ENOMEM;
-	DPRINTK(DEBUG_DISABLED, "(%s): new VFS inode(%u): %p  dentry: %p\n",
-		dentry->d_name.name, de->inode.ino, inode, dentry);
-	d_instantiate(dentry, inode);
-	if (!is_devfsd_or_child(fs_info))
-		devfsd_notify_de(de, DEVFSD_NOTIFY_CREATE, inode->i_mode,
-				 inode->i_uid, inode->i_gid, fs_info);
-	return 0;
-}				/*  End Function devfs_symlink  */
-
-static int devfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
-{
-	int err;
-	struct fs_info *fs_info = dir->i_sb->s_fs_info;
-	struct devfs_entry *parent, *de;
-	struct inode *inode;
-
-	mode = (mode & ~S_IFMT) | S_IFDIR;	/*  VFS doesn't pass S_IFMT part  */
-	parent = get_devfs_entry_from_vfs_inode(dir);
-	if (parent == NULL)
-		return -ENOENT;
-	de = _devfs_alloc_entry(dentry->d_name.name, dentry->d_name.len, mode);
-	if (!de)
-		return -ENOMEM;
-	de->vfs = TRUE;
-	if ((err = _devfs_append_entry(parent, de, NULL)) != 0)
-		return err;
-	de->inode.uid = current->euid;
-	de->inode.gid = current->egid;
-	de->inode.atime = CURRENT_TIME;
-	de->inode.mtime = CURRENT_TIME;
-	de->inode.ctime = CURRENT_TIME;
-	if ((inode = _devfs_get_vfs_inode(dir->i_sb, de, dentry)) == NULL)
-		return -ENOMEM;
-	DPRINTK(DEBUG_DISABLED, "(%s): new VFS inode(%u): %p  dentry: %p\n",
-		dentry->d_name.name, de->inode.ino, inode, dentry);
-	d_instantiate(dentry, inode);
-	if (!is_devfsd_or_child(fs_info))
-		devfsd_notify_de(de, DEVFSD_NOTIFY_CREATE, inode->i_mode,
-				 inode->i_uid, inode->i_gid, fs_info);
-	return 0;
-}				/*  End Function devfs_mkdir  */
-
-static int devfs_rmdir(struct inode *dir, struct dentry *dentry)
-{
-	int err = 0;
-	struct devfs_entry *de;
-	struct fs_info *fs_info = dir->i_sb->s_fs_info;
-	struct inode *inode = dentry->d_inode;
-
-	if (dir->i_sb->s_fs_info != inode->i_sb->s_fs_info)
-		return -EINVAL;
-	de = get_devfs_entry_from_vfs_inode(inode);
-	if (de == NULL)
-		return -ENOENT;
-	if (!S_ISDIR(de->mode))
-		return -ENOTDIR;
-	if (!de->vfs)
-		return -EPERM;
-	/*  First ensure the directory is empty and will stay that way  */
-	write_lock(&de->u.dir.lock);
-	if (de->u.dir.first)
-		err = -ENOTEMPTY;
-	else
-		de->u.dir.no_more_additions = TRUE;
-	write_unlock(&de->u.dir.lock);
-	if (err)
-		return err;
-	/*  Now unhook the directory from its parent  */
-	write_lock(&de->parent->u.dir.lock);
-	if (!_devfs_unhook(de))
-		err = -ENOENT;
-	write_unlock(&de->parent->u.dir.lock);
-	if (err)
-		return err;
-	if (!is_devfsd_or_child(fs_info))
-		devfsd_notify_de(de, DEVFSD_NOTIFY_DELETE, inode->i_mode,
-				 inode->i_uid, inode->i_gid, fs_info);
-	free_dentry(de);
-	devfs_put(de);
-	return 0;
-}				/*  End Function devfs_rmdir  */
-
-static int devfs_mknod(struct inode *dir, struct dentry *dentry, int mode,
-		       dev_t rdev)
-{
-	int err;
-	struct fs_info *fs_info = dir->i_sb->s_fs_info;
-	struct devfs_entry *parent, *de;
-	struct inode *inode;
-
-	DPRINTK(DEBUG_I_MKNOD, "(%s): mode: 0%o  dev: %u:%u\n",
-		dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
-	parent = get_devfs_entry_from_vfs_inode(dir);
-	if (parent == NULL)
-		return -ENOENT;
-	de = _devfs_alloc_entry(dentry->d_name.name, dentry->d_name.len, mode);
-	if (!de)
-		return -ENOMEM;
-	de->vfs = TRUE;
-	if (S_ISCHR(mode) || S_ISBLK(mode))
-		de->u.dev = rdev;
-	if ((err = _devfs_append_entry(parent, de, NULL)) != 0)
-		return err;
-	de->inode.uid = current->euid;
-	de->inode.gid = current->egid;
-	de->inode.atime = CURRENT_TIME;
-	de->inode.mtime = CURRENT_TIME;
-	de->inode.ctime = CURRENT_TIME;
-	if ((inode = _devfs_get_vfs_inode(dir->i_sb, de, dentry)) == NULL)
-		return -ENOMEM;
-	DPRINTK(DEBUG_I_MKNOD, ":   new VFS inode(%u): %p  dentry: %p\n",
-		de->inode.ino, inode, dentry);
-	d_instantiate(dentry, inode);
-	if (!is_devfsd_or_child(fs_info))
-		devfsd_notify_de(de, DEVFSD_NOTIFY_CREATE, inode->i_mode,
-				 inode->i_uid, inode->i_gid, fs_info);
-	return 0;
-}				/*  End Function devfs_mknod  */
-
-static void *devfs_follow_link(struct dentry *dentry, struct nameidata *nd)
-{
-	struct devfs_entry *p = get_devfs_entry_from_vfs_inode(dentry->d_inode);
-	nd_set_link(nd, p ? p->u.symlink.linkname : ERR_PTR(-ENODEV));
-	return NULL;
-}				/*  End Function devfs_follow_link  */
-
-static struct inode_operations devfs_iops = {
-	.setattr = devfs_notify_change,
-};
-
-static struct inode_operations devfs_dir_iops = {
-	.lookup = devfs_lookup,
-	.unlink = devfs_unlink,
-	.symlink = devfs_symlink,
-	.mkdir = devfs_mkdir,
-	.rmdir = devfs_rmdir,
-	.mknod = devfs_mknod,
-	.setattr = devfs_notify_change,
-};
-
-static struct inode_operations devfs_symlink_iops = {
-	.readlink = generic_readlink,
-	.follow_link = devfs_follow_link,
-	.setattr = devfs_notify_change,
-};
-
-static int devfs_fill_super(struct super_block *sb, void *data, int silent)
-{
-	struct inode *root_inode = NULL;
-
-	if (_devfs_get_root_entry() == NULL)
-		goto out_no_root;
-	atomic_set(&fs_info.devfsd_overrun_count, 0);
-	init_waitqueue_head(&fs_info.devfsd_wait_queue);
-	init_waitqueue_head(&fs_info.revalidate_wait_queue);
-	fs_info.sb = sb;
-	sb->s_fs_info = &fs_info;
-	sb->s_blocksize = 1024;
-	sb->s_blocksize_bits = 10;
-	sb->s_magic = DEVFS_SUPER_MAGIC;
-	sb->s_op = &devfs_sops;
-	sb->s_time_gran = 1;
-	if ((root_inode = _devfs_get_vfs_inode(sb, root_entry, NULL)) == NULL)
-		goto out_no_root;
-	sb->s_root = d_alloc_root(root_inode);
-	if (!sb->s_root)
-		goto out_no_root;
-	DPRINTK(DEBUG_S_READ, "(): made devfs ptr: %p\n", sb->s_fs_info);
-	return 0;
-
-      out_no_root:
-	PRINTK("(): get root inode failed\n");
-	if (root_inode)
-		iput(root_inode);
-	return -EINVAL;
-}				/*  End Function devfs_fill_super  */
-
-static int devfs_get_sb(struct file_system_type *fs_type,
-			int flags, const char *dev_name,
-			void *data, struct vfsmount *mnt)
-{
-	return get_sb_single(fs_type, flags, data, devfs_fill_super, mnt);
-}
-
-static struct file_system_type devfs_fs_type = {
-	.name = DEVFS_NAME,
-	.get_sb = devfs_get_sb,
-	.kill_sb = kill_anon_super,
-};
-
-/*  File operations for devfsd follow  */
-
-static ssize_t devfsd_read(struct file *file, char __user *buf, size_t len,
-			   loff_t * ppos)
-{
-	int done = FALSE;
-	int ival;
-	loff_t pos, devname_offset, tlen, rpos;
-	devfs_handle_t de;
-	struct devfsd_buf_entry *entry;
-	struct fs_info *fs_info = file->f_dentry->d_inode->i_sb->s_fs_info;
-	struct devfsd_notify_struct *info = fs_info->devfsd_info;
-	DECLARE_WAITQUEUE(wait, current);
-
-	/*  Verify the task has grabbed the queue  */
-	if (fs_info->devfsd_task != current)
-		return -EPERM;
-	info->major = 0;
-	info->minor = 0;
-	/*  Block for a new entry  */
-	set_current_state(TASK_INTERRUPTIBLE);
-	add_wait_queue(&fs_info->devfsd_wait_queue, &wait);
-	while (devfsd_queue_empty(fs_info)) {
-		fs_info->devfsd_sleeping = TRUE;
-		wake_up(&fs_info->revalidate_wait_queue);
-		schedule();
-		fs_info->devfsd_sleeping = FALSE;
-		if (signal_pending(current)) {
-			remove_wait_queue(&fs_info->devfsd_wait_queue, &wait);
-			__set_current_state(TASK_RUNNING);
-			return -EINTR;
-		}
-		set_current_state(TASK_INTERRUPTIBLE);
-	}
-	remove_wait_queue(&fs_info->devfsd_wait_queue, &wait);
-	__set_current_state(TASK_RUNNING);
-	/*  Now play with the data  */
-	ival = atomic_read(&fs_info->devfsd_overrun_count);
-	info->overrun_count = ival;
-	entry = fs_info->devfsd_first_event;
-	info->type = entry->type;
-	info->mode = entry->mode;
-	info->uid = entry->uid;
-	info->gid = entry->gid;
-	de = entry->de;
-	if (S_ISCHR(de->mode) || S_ISBLK(de->mode)) {
-		info->major = MAJOR(de->u.dev);
-		info->minor = MINOR(de->u.dev);
-	}
-	pos = devfs_generate_path(de, info->devname, DEVFS_PATHLEN);
-	if (pos < 0)
-		return pos;
-	info->namelen = DEVFS_PATHLEN - pos - 1;
-	if (info->mode == 0)
-		info->mode = de->mode;
-	devname_offset = info->devname - (char *)info;
-	rpos = *ppos;
-	if (rpos < devname_offset) {
-		/*  Copy parts of the header  */
-		tlen = devname_offset - rpos;
-		if (tlen > len)
-			tlen = len;
-		if (copy_to_user(buf, (char *)info + rpos, tlen)) {
-			return -EFAULT;
-		}
-		rpos += tlen;
-		buf += tlen;
-		len -= tlen;
-	}
-	if ((rpos >= devname_offset) && (len > 0)) {
-		/*  Copy the name  */
-		tlen = info->namelen + 1;
-		if (tlen > len)
-			tlen = len;
-		else
-			done = TRUE;
-		if (copy_to_user
-		    (buf, info->devname + pos + rpos - devname_offset, tlen)) {
-			return -EFAULT;
-		}
-		rpos += tlen;
-	}
-	tlen = rpos - *ppos;
-	if (done) {
-		devfs_handle_t parent;
-
-		spin_lock(&fs_info->devfsd_buffer_lock);
-		fs_info->devfsd_first_event = entry->next;
-		if (entry->next == NULL)
-			fs_info->devfsd_last_event = NULL;
-		spin_unlock(&fs_info->devfsd_buffer_lock);
-		for (; de != NULL; de = parent) {
-			parent = de->parent;
-			devfs_put(de);
-		}
-		kmem_cache_free(devfsd_buf_cache, entry);
-		if (ival > 0)
-			atomic_sub(ival, &fs_info->devfsd_overrun_count);
-		*ppos = 0;
-	} else
-		*ppos = rpos;
-	return tlen;
-}				/*  End Function devfsd_read  */
-
-static int devfsd_ioctl(struct inode *inode, struct file *file,
-			unsigned int cmd, unsigned long arg)
-{
-	int ival;
-	struct fs_info *fs_info = inode->i_sb->s_fs_info;
-
-	switch (cmd) {
-	case DEVFSDIOC_GET_PROTO_REV:
-		ival = DEVFSD_PROTOCOL_REVISION_KERNEL;
-		if (copy_to_user((void __user *)arg, &ival, sizeof ival))
-			return -EFAULT;
-		break;
-	case DEVFSDIOC_SET_EVENT_MASK:
-		/*  Ensure only one reader has access to the queue. This scheme will
-		   work even if the global kernel lock were to be removed, because it
-		   doesn't matter who gets in first, as long as only one gets it  */
-		if (fs_info->devfsd_task == NULL) {
-			static DEFINE_SPINLOCK(lock);
-
-			if (!spin_trylock(&lock))
-				return -EBUSY;
-			if (fs_info->devfsd_task != NULL) {	/*  We lost the race...  */
-				spin_unlock(&lock);
-				return -EBUSY;
-			}
-			fs_info->devfsd_task = current;
-			spin_unlock(&lock);
-			fs_info->devfsd_pgrp =
-			    (process_group(current) ==
-			     current->pid) ? process_group(current) : 0;
-			fs_info->devfsd_file = file;
-			fs_info->devfsd_info =
-			    kmalloc(sizeof *fs_info->devfsd_info, GFP_KERNEL);
-			if (!fs_info->devfsd_info) {
-				devfsd_close(inode, file);
-				return -ENOMEM;
-			}
-		} else if (fs_info->devfsd_task != current)
-			return -EBUSY;
-		fs_info->devfsd_event_mask = arg;	/*  Let the masses come forth  */
-		break;
-	case DEVFSDIOC_RELEASE_EVENT_QUEUE:
-		if (fs_info->devfsd_file != file)
-			return -EPERM;
-		return devfsd_close(inode, file);
-		/*break; */
-#ifdef CONFIG_DEVFS_DEBUG
-	case DEVFSDIOC_SET_DEBUG_MASK:
-		if (copy_from_user(&ival, (void __user *)arg, sizeof ival))
-			return -EFAULT;
-		devfs_debug = ival;
-		break;
-#endif
-	default:
-		return -ENOIOCTLCMD;
-	}
-	return 0;
-}				/*  End Function devfsd_ioctl  */
-
-static int devfsd_close(struct inode *inode, struct file *file)
-{
-	struct devfsd_buf_entry *entry, *next;
-	struct fs_info *fs_info = inode->i_sb->s_fs_info;
-
-	if (fs_info->devfsd_file != file)
-		return 0;
-	fs_info->devfsd_event_mask = 0;
-	fs_info->devfsd_file = NULL;
-	spin_lock(&fs_info->devfsd_buffer_lock);
-	entry = fs_info->devfsd_first_event;
-	fs_info->devfsd_first_event = NULL;
-	fs_info->devfsd_last_event = NULL;
-	kfree(fs_info->devfsd_info);
-	fs_info->devfsd_info = NULL;
-	spin_unlock(&fs_info->devfsd_buffer_lock);
-	fs_info->devfsd_pgrp = 0;
-	fs_info->devfsd_task = NULL;
-	wake_up(&fs_info->revalidate_wait_queue);
-	for (; entry; entry = next) {
-		next = entry->next;
-		kmem_cache_free(devfsd_buf_cache, entry);
-	}
-	return 0;
-}				/*  End Function devfsd_close  */
-
-#ifdef CONFIG_DEVFS_DEBUG
-static ssize_t stat_read(struct file *file, char __user *buf, size_t len,
-			 loff_t * ppos)
-{
-	ssize_t num;
-	char txt[80];
-
-	num = sprintf(txt, "Number of entries: %u  number of bytes: %u\n",
-		      stat_num_entries, stat_num_bytes) + 1;
-	if (*ppos >= num)
-		return 0;
-	if (*ppos + len > num)
-		len = num - *ppos;
-	if (copy_to_user(buf, txt + *ppos, len))
-		return -EFAULT;
-	*ppos += len;
-	return len;
-}				/*  End Function stat_read  */
-#endif
-
-static int __init init_devfs_fs(void)
-{
-	int err;
-	int major;
-	struct devfs_entry *devfsd;
-#ifdef CONFIG_DEVFS_DEBUG
-	struct devfs_entry *stat;
-#endif
-
-	if (_devfs_get_root_entry() == NULL)
-		return -ENOMEM;
-
-	printk(KERN_INFO "%s: %s Richard Gooch (rgooch@atnf.csiro.au)\n",
-	       DEVFS_NAME, DEVFS_VERSION);
-	devfsd_buf_cache = kmem_cache_create("devfsd_event",
-					     sizeof(struct devfsd_buf_entry),
-					     0, 0, NULL, NULL);
-	if (!devfsd_buf_cache)
-		OOPS("(): unable to allocate event slab\n");
-#ifdef CONFIG_DEVFS_DEBUG
-	devfs_debug = devfs_debug_init;
-	printk(KERN_INFO "%s: devfs_debug: 0x%0x\n", DEVFS_NAME, devfs_debug);
-#endif
-	printk(KERN_INFO "%s: boot_options: 0x%0x\n", DEVFS_NAME, boot_options);
-
-	/* register special device for devfsd communication */
-	major = register_chrdev(0, "devfs", &devfs_fops);
-	if (major < 0)
-		return major;
-
-	/*  And create the entry for ".devfsd"  */
-	devfsd = _devfs_alloc_entry(".devfsd", 0, S_IFCHR | S_IRUSR | S_IWUSR);
-	if (devfsd == NULL)
-		return -ENOMEM;
-	devfsd->u.dev = MKDEV(major, 0);
-	_devfs_append_entry(root_entry, devfsd, NULL);
-
-#ifdef CONFIG_DEVFS_DEBUG
-	stat = _devfs_alloc_entry(".stat", 0, S_IFCHR | S_IRUGO);
-	if (stat == NULL)
-		return -ENOMEM;
-	stat->u.dev = MKDEV(major, 1);
-	_devfs_append_entry(root_entry, stat, NULL);
-#endif
-
-	err = register_filesystem(&devfs_fs_type);
-	return err;
-}				/*  End Function init_devfs_fs  */
-
-void __init mount_devfs_fs(void)
-{
-	int err;
-
-	if (!(boot_options & OPTION_MOUNT))
-		return;
-	err = do_mount("none", "/dev", "devfs", 0, NULL);
-	if (err == 0)
-		printk(KERN_INFO "Mounted devfs on /dev\n");
-	else
-		PRINTK("(): unable to mount devfs, err: %d\n", err);
-}				/*  End Function mount_devfs_fs  */
-
-module_init(init_devfs_fs)
diff --git a/fs/devfs/util.c b/fs/devfs/util.c
deleted file mode 100644
index db06d38..0000000
--- a/fs/devfs/util.c
+++ /dev/null
@@ -1,97 +0,0 @@
-/*  devfs (Device FileSystem) utilities.
-
-    Copyright (C) 1999-2002  Richard Gooch
-
-    This library is free software; you can redistribute it and/or
-    modify it under the terms of the GNU Library General Public
-    License as published by the Free Software Foundation; either
-    version 2 of the License, or (at your option) any later version.
-
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-    Library General Public License for more details.
-
-    You should have received a copy of the GNU Library General Public
-    License along with this library; if not, write to the Free
-    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-    Richard Gooch may be reached by email at  rgooch@atnf.csiro.au
-    The postal address is:
-      Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
-
-    ChangeLog
-
-    19991031   Richard Gooch <rgooch@atnf.csiro.au>
-               Created.
-    19991103   Richard Gooch <rgooch@atnf.csiro.au>
-               Created <_devfs_convert_name> and supported SCSI and IDE CD-ROMs
-    20000203   Richard Gooch <rgooch@atnf.csiro.au>
-               Changed operations pointer type to void *.
-    20000621   Richard Gooch <rgooch@atnf.csiro.au>
-               Changed interface to <devfs_register_series>.
-    20000622   Richard Gooch <rgooch@atnf.csiro.au>
-               Took account of interface change to <devfs_mk_symlink>.
-               Took account of interface change to <devfs_mk_dir>.
-    20010519   Richard Gooch <rgooch@atnf.csiro.au>
-               Documentation cleanup.
-    20010709   Richard Gooch <rgooch@atnf.csiro.au>
-               Created <devfs_*alloc_major> and <devfs_*alloc_devnum>.
-    20010710   Richard Gooch <rgooch@atnf.csiro.au>
-               Created <devfs_*alloc_unique_number>.
-    20010730   Richard Gooch <rgooch@atnf.csiro.au>
-               Documentation typo fix.
-    20010806   Richard Gooch <rgooch@atnf.csiro.au>
-               Made <block_semaphore> and <char_semaphore> private.
-    20010813   Richard Gooch <rgooch@atnf.csiro.au>
-               Fixed bug in <devfs_alloc_unique_number>: limited to 128 numbers
-    20010818   Richard Gooch <rgooch@atnf.csiro.au>
-               Updated major masks up to Linus' "no new majors" proclamation.
-	       Block: were 126 now 122 free, char: were 26 now 19 free.
-    20020324   Richard Gooch <rgooch@atnf.csiro.au>
-               Fixed bug in <devfs_alloc_unique_number>: was clearing beyond
-	       bitfield.
-    20020326   Richard Gooch <rgooch@atnf.csiro.au>
-               Fixed bitfield data type for <devfs_*alloc_devnum>.
-               Made major bitfield type and initialiser 64 bit safe.
-    20020413   Richard Gooch <rgooch@atnf.csiro.au>
-               Fixed shift warning on 64 bit machines.
-    20020428   Richard Gooch <rgooch@atnf.csiro.au>
-               Copied and used macro for error messages from fs/devfs/base.c 
-    20021013   Richard Gooch <rgooch@atnf.csiro.au>
-               Documentation fix.
-    20030101   Adam J. Richter <adam@yggdrasil.com>
-               Eliminate DEVFS_SPECIAL_{CHR,BLK}.  Use mode_t instead.
-    20030106   Christoph Hellwig <hch@infradead.org>
-               Rewrite devfs_{,de}alloc_devnum to look like C code.
-*/
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/devfs_fs_kernel.h>
-#include <linux/slab.h>
-#include <linux/vmalloc.h>
-#include <linux/genhd.h>
-#include <linux/bitops.h>
-
-int devfs_register_tape(const char *name)
-{
-	char tname[32], dest[64];
-	static unsigned int tape_counter;
-	unsigned int n = tape_counter++;
-
-	sprintf(dest, "../%s", name);
-	sprintf(tname, "tapes/tape%u", n);
-	devfs_mk_symlink(tname, dest);
-
-	return n;
-}
-
-EXPORT_SYMBOL(devfs_register_tape);
-
-void devfs_unregister_tape(int num)
-{
-	if (num >= 0)
-		devfs_remove("tapes/tape%u", num);
-}
-
-EXPORT_SYMBOL(devfs_unregister_tape);