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File: [Development] / linux-2.6-xfs / lib / reed_solomon / encode_rs.c (download)

Revision 1.15, Wed Sep 12 17:09:56 2007 UTC (10 years, 1 month ago) by tes.longdrop.melbourne.sgi.com
Branch: MAIN
Changes since 1.14: +0 -0 lines 

Update 2.6.x-xfs to 2.6.23-rc4.

Also update fs/xfs with external mainline changes.
There were 12 such missing commits that I detected:

--------
commit ad690ef9e690f6c31f7d310b09ef1314bcec9033
Author: Al Viro <viro@ftp.linux.org.uk>
    xfs ioctl __user annotations

commit 20c2df83d25c6a95affe6157a4c9cac4cf5ffaac
Author: Paul Mundt <lethal@linux-sh.org>
    mm: Remove slab destructors from kmem_cache_create().

commit d0217ac04ca6591841e5665f518e38064f4e65bd
Author: Nick Piggin <npiggin@suse.de>
    mm: fault feedback #1

commit 54cb8821de07f2ffcd28c380ce9b93d5784b40d7
Author: Nick Piggin <npiggin@suse.de>
    mm: merge populate and nopage into fault (fixes nonlinear)

commit d00806b183152af6d24f46f0c33f14162ca1262a
Author: Nick Piggin <npiggin@suse.de>
    mm: fix fault vs invalidate race for linear mappings

commit a569425512253992cc64ebf8b6d00a62f986db3e
Author: Christoph Hellwig <hch@infradead.org>
    knfsd: exportfs: add exportfs.h header

commit 831441862956fffa17b9801db37e6ea1650b0f69
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Freezer: make kernel threads nonfreezable by default

commit 8e1f936b73150f5095448a0fee6d4f30a1f9001d
Author: Rusty Russell <rusty@rustcorp.com.au>
    mm: clean up and kernelify shrinker registration

commit 5ffc4ef45b3b0a57872f631b4e4ceb8ace0d7496
Author: Jens Axboe <jens.axboe@oracle.com>
    sendfile: remove .sendfile from filesystems that use generic_file_sendfile()

commit 8bb7844286fb8c9fce6f65d8288aeb09d03a5e0d
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Add suspend-related notifications for CPU hotplug

commit 59c51591a0ac7568824f541f57de967e88adaa07
Author: Michael Opdenacker <michael@free-electrons.com>
    Fix occurrences of "the the "

commit 0ceb331433e8aad9c5f441a965d7c681f8b9046f
Author: Dmitriy Monakhov <dmonakhov@openvz.org>
    mm: move common segment checks to separate helper function
--------
Merge of 2.6.x-xfs-melb:linux:29656b by kenmcd.

/*
 * lib/reed_solomon/encode_rs.c
 *
 * Overview:
 *   Generic Reed Solomon encoder / decoder library
 *
 * Copyright 2002, Phil Karn, KA9Q
 * May be used under the terms of the GNU General Public License (GPL)
 *
 * Adaption to the kernel by Thomas Gleixner (tglx@linutronix.de)
 *
 * $Id: encode_rs.c,v 1.15 2007/09/12 17:09:56 tes.longdrop.melbourne.sgi.com Exp $
 *
 */

/* Generic data width independent code which is included by the
 * wrappers.
 * int encode_rsX (struct rs_control *rs, uintX_t *data, int len, uintY_t *par)
 */
{
	int i, j, pad;
	int nn = rs->nn;
	int nroots = rs->nroots;
	uint16_t *alpha_to = rs->alpha_to;
	uint16_t *index_of = rs->index_of;
	uint16_t *genpoly = rs->genpoly;
	uint16_t fb;
	uint16_t msk = (uint16_t) rs->nn;

	/* Check length parameter for validity */
	pad = nn - nroots - len;
	if (pad < 0 || pad >= nn)
		return -ERANGE;

	for (i = 0; i < len; i++) {
		fb = index_of[((((uint16_t) data[i])^invmsk) & msk) ^ par[0]];
		/* feedback term is non-zero */
		if (fb != nn) {
			for (j = 1; j < nroots; j++) {
				par[j] ^= alpha_to[rs_modnn(rs, fb +
							 genpoly[nroots - j])];
			}
		}
		/* Shift */
		memmove(&par[0], &par[1], sizeof(uint16_t) * (nroots - 1));
		if (fb != nn) {
			par[nroots - 1] = alpha_to[rs_modnn(rs,
							    fb + genpoly[0])];
		} else {
			par[nroots - 1] = 0;
		}
	}
	return 0;
}