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/* 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); |