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Diffstat (limited to 'fs/devfs/util.c')
| -rw-r--r-- | fs/devfs/util.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/fs/devfs/util.c b/fs/devfs/util.c new file mode 100644 index 00000000000..db06d388c9a --- /dev/null +++ b/fs/devfs/util.c @@ -0,0 +1,97 @@ +/* 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); |