| /* 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); |