| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* devfs (Device FileSystem) utilities. |
| 2 | |
| 3 | Copyright (C) 1999-2002 Richard Gooch |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Library General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2 of the License, or (at your option) any later version. |
| 9 | |
| 10 | This library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Library General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Library General Public |
| 16 | License along with this library; if not, write to the Free |
| 17 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 18 | |
| 19 | Richard Gooch may be reached by email at rgooch@atnf.csiro.au |
| 20 | The postal address is: |
| 21 | Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia. |
| 22 | |
| 23 | ChangeLog |
| 24 | |
| 25 | 19991031 Richard Gooch <rgooch@atnf.csiro.au> |
| 26 | Created. |
| 27 | 19991103 Richard Gooch <rgooch@atnf.csiro.au> |
| 28 | Created <_devfs_convert_name> and supported SCSI and IDE CD-ROMs |
| 29 | 20000203 Richard Gooch <rgooch@atnf.csiro.au> |
| 30 | Changed operations pointer type to void *. |
| 31 | 20000621 Richard Gooch <rgooch@atnf.csiro.au> |
| 32 | Changed interface to <devfs_register_series>. |
| 33 | 20000622 Richard Gooch <rgooch@atnf.csiro.au> |
| 34 | Took account of interface change to <devfs_mk_symlink>. |
| 35 | Took account of interface change to <devfs_mk_dir>. |
| 36 | 20010519 Richard Gooch <rgooch@atnf.csiro.au> |
| 37 | Documentation cleanup. |
| 38 | 20010709 Richard Gooch <rgooch@atnf.csiro.au> |
| 39 | Created <devfs_*alloc_major> and <devfs_*alloc_devnum>. |
| 40 | 20010710 Richard Gooch <rgooch@atnf.csiro.au> |
| 41 | Created <devfs_*alloc_unique_number>. |
| 42 | 20010730 Richard Gooch <rgooch@atnf.csiro.au> |
| 43 | Documentation typo fix. |
| 44 | 20010806 Richard Gooch <rgooch@atnf.csiro.au> |
| 45 | Made <block_semaphore> and <char_semaphore> private. |
| 46 | 20010813 Richard Gooch <rgooch@atnf.csiro.au> |
| 47 | Fixed bug in <devfs_alloc_unique_number>: limited to 128 numbers |
| 48 | 20010818 Richard Gooch <rgooch@atnf.csiro.au> |
| 49 | Updated major masks up to Linus' "no new majors" proclamation. |
| 50 | Block: were 126 now 122 free, char: were 26 now 19 free. |
| 51 | 20020324 Richard Gooch <rgooch@atnf.csiro.au> |
| 52 | Fixed bug in <devfs_alloc_unique_number>: was clearing beyond |
| 53 | bitfield. |
| 54 | 20020326 Richard Gooch <rgooch@atnf.csiro.au> |
| 55 | Fixed bitfield data type for <devfs_*alloc_devnum>. |
| 56 | Made major bitfield type and initialiser 64 bit safe. |
| 57 | 20020413 Richard Gooch <rgooch@atnf.csiro.au> |
| 58 | Fixed shift warning on 64 bit machines. |
| 59 | 20020428 Richard Gooch <rgooch@atnf.csiro.au> |
| 60 | Copied and used macro for error messages from fs/devfs/base.c |
| 61 | 20021013 Richard Gooch <rgooch@atnf.csiro.au> |
| 62 | Documentation fix. |
| 63 | 20030101 Adam J. Richter <adam@yggdrasil.com> |
| 64 | Eliminate DEVFS_SPECIAL_{CHR,BLK}. Use mode_t instead. |
| 65 | 20030106 Christoph Hellwig <hch@infradead.org> |
| 66 | Rewrite devfs_{,de}alloc_devnum to look like C code. |
| 67 | */ |
| 68 | #include <linux/module.h> |
| 69 | #include <linux/init.h> |
| 70 | #include <linux/devfs_fs_kernel.h> |
| 71 | #include <linux/slab.h> |
| 72 | #include <linux/vmalloc.h> |
| 73 | #include <linux/genhd.h> |
| 74 | #include <linux/bitops.h> |
| 75 | |
| 76 | int devfs_register_tape(const char *name) |
| 77 | { |
| 78 | char tname[32], dest[64]; |
| 79 | static unsigned int tape_counter; |
| 80 | unsigned int n = tape_counter++; |
| 81 | |
| 82 | sprintf(dest, "../%s", name); |
| 83 | sprintf(tname, "tapes/tape%u", n); |
| 84 | devfs_mk_symlink(tname, dest); |
| 85 | |
| 86 | return n; |
| 87 | } |
| 88 | |
| 89 | EXPORT_SYMBOL(devfs_register_tape); |
| 90 | |
| 91 | void devfs_unregister_tape(int num) |
| 92 | { |
| 93 | if (num >= 0) |
| 94 | devfs_remove("tapes/tape%u", num); |
| 95 | } |
| 96 | |
| 97 | EXPORT_SYMBOL(devfs_unregister_tape); |