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98 lines
3.9 KiB
C
98 lines
3.9 KiB
C
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/* devfs (Device FileSystem) utilities.
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Copyright (C) 1999-2002 Richard Gooch
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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Richard Gooch may be reached by email at rgooch@atnf.csiro.au
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The postal address is:
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Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
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ChangeLog
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19991031 Richard Gooch <rgooch@atnf.csiro.au>
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Created.
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19991103 Richard Gooch <rgooch@atnf.csiro.au>
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Created <_devfs_convert_name> and supported SCSI and IDE CD-ROMs
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20000203 Richard Gooch <rgooch@atnf.csiro.au>
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Changed operations pointer type to void *.
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20000621 Richard Gooch <rgooch@atnf.csiro.au>
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Changed interface to <devfs_register_series>.
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20000622 Richard Gooch <rgooch@atnf.csiro.au>
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Took account of interface change to <devfs_mk_symlink>.
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Took account of interface change to <devfs_mk_dir>.
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20010519 Richard Gooch <rgooch@atnf.csiro.au>
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Documentation cleanup.
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20010709 Richard Gooch <rgooch@atnf.csiro.au>
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Created <devfs_*alloc_major> and <devfs_*alloc_devnum>.
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20010710 Richard Gooch <rgooch@atnf.csiro.au>
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Created <devfs_*alloc_unique_number>.
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20010730 Richard Gooch <rgooch@atnf.csiro.au>
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Documentation typo fix.
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20010806 Richard Gooch <rgooch@atnf.csiro.au>
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Made <block_semaphore> and <char_semaphore> private.
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20010813 Richard Gooch <rgooch@atnf.csiro.au>
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Fixed bug in <devfs_alloc_unique_number>: limited to 128 numbers
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20010818 Richard Gooch <rgooch@atnf.csiro.au>
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Updated major masks up to Linus' "no new majors" proclamation.
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Block: were 126 now 122 free, char: were 26 now 19 free.
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20020324 Richard Gooch <rgooch@atnf.csiro.au>
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Fixed bug in <devfs_alloc_unique_number>: was clearing beyond
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bitfield.
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20020326 Richard Gooch <rgooch@atnf.csiro.au>
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Fixed bitfield data type for <devfs_*alloc_devnum>.
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Made major bitfield type and initialiser 64 bit safe.
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20020413 Richard Gooch <rgooch@atnf.csiro.au>
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Fixed shift warning on 64 bit machines.
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20020428 Richard Gooch <rgooch@atnf.csiro.au>
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Copied and used macro for error messages from fs/devfs/base.c
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20021013 Richard Gooch <rgooch@atnf.csiro.au>
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Documentation fix.
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20030101 Adam J. Richter <adam@yggdrasil.com>
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Eliminate DEVFS_SPECIAL_{CHR,BLK}. Use mode_t instead.
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20030106 Christoph Hellwig <hch@infradead.org>
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Rewrite devfs_{,de}alloc_devnum to look like C code.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/devfs_fs_kernel.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/genhd.h>
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#include <linux/bitops.h>
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int devfs_register_tape(const char *name)
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{
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char tname[32], dest[64];
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static unsigned int tape_counter;
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unsigned int n = tape_counter++;
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sprintf(dest, "../%s", name);
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sprintf(tname, "tapes/tape%u", n);
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devfs_mk_symlink(tname, dest);
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return n;
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}
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EXPORT_SYMBOL(devfs_register_tape);
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void devfs_unregister_tape(int num)
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{
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if (num >= 0)
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devfs_remove("tapes/tape%u", num);
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}
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EXPORT_SYMBOL(devfs_unregister_tape);
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