[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>

8 files changed, 0 insertions, 3007 deletions

diff --git a/fs/Makefile b/fs/Makefile
index d0ea6bfccf29..89135428a539 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 d8ecfedef189..d8d50a70c58d 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 6dd8d1245e2c..000000000000
--- 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 51a97f132745..000000000000
--- 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 devf