/*
 * snapshot.c    Ceph snapshot context utility routines (part of libceph)
 *
 * Copyright (C) 2013 Inktank Storage, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#include <stddef.h>

#include <linux/types.h>
#include <linux/export.h>
#include <linux/ceph/libceph.h>

/*
 * Ceph snapshot contexts are reference counted objects, and the
 * returned structure holds a single reference.  Acquire additional
 * references with ceph_get_snap_context(), and release them with
 * ceph_put_snap_context().  When the reference count reaches zero
 * the entire structure is freed.
 */

/*
 * Create a new ceph snapshot context large enough to hold the
 * indicated number of snapshot ids (which can be 0).  Caller has
 * to fill in snapc->seq and snapc->snaps[0..snap_count-1].
 *
 * Returns a null pointer if an error occurs.
 */
struct ceph_snap_context *ceph_create_snap_context(u32 snap_count,
						gfp_t gfp_flags)
{
	struct ceph_snap_context *snapc;
	size_t size;

	size = sizeof (struct ceph_snap_context);
	size += snap_count * sizeof (snapc->snaps[0]);
	snapc = kzalloc(size, gfp_flags);
	if (!snapc)
		return NULL;

	atomic_set(&snapc->nref, 1);
	snapc->num_snaps = snap_count;

	return snapc;
}
EXPORT_SYMBOL(ceph_create_snap_context);

struct ceph_snap_context *ceph_get_snap_context(struct ceph_snap_context *sc)
{
	if (sc)
		atomic_inc(&sc->nref);
	return sc;
}
EXPORT_SYMBOL(ceph_get_snap_context);

void ceph_put_snap_context(struct ceph_snap_context *sc)
{
	if (!sc)
		return;
	if (atomic_dec_and_test(&sc->nref)) {
		/*printk(" deleting snap_context %p\n", sc);*/
		kfree(sc);
	}
}
EXPORT_SYMBOL(ceph_put_snap_context);
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=11e3b725cfc282efe9d4a354153e99d86a16af08'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=11e3b725cfc282efe9d4a354153e99d86a16af08'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/802?id=11e3b725cfc282efe9d4a354153e99d86a16af08'>802</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/802/garp.c?id=11e3b725cfc282efe9d4a354153e99d86a16af08'>garp.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='11e3b725cfc282efe9d4a354153e99d86a16af08'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;</td><td class='right'>2017-01-17 13:46:29 +0000</td></tr>
<tr><th>committer</th><td>Herbert Xu &lt;herbert@gondor.apana.org.au&gt;</td><td class='right'>2017-01-23 22:41:33 +0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/802/garp.c?id=11e3b725cfc282efe9d4a354153e99d86a16af08'>11e3b725cfc282efe9d4a354153e99d86a16af08</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/802/garp.c?id=11e3b725cfc282efe9d4a354153e99d86a16af08'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=11e3b725cfc282efe9d4a354153e99d86a16af08'>8b5b9e0e1bcae1ab98ee652ffb7b13b05c209bd6</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/802/garp.c?id=11e3b725cfc282efe9d4a354153e99d86a16af08'>net/802/garp.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/802/garp.c?id=d6040764adcb5cb6de1489422411d701c158bb69'>d6040764adcb5cb6de1489422411d701c158bb69</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/802/garp.c?id=11e3b725cfc282efe9d4a354153e99d86a16af08&amp;id2=d6040764adcb5cb6de1489422411d701c158bb69'>diff</a>)</td></tr></table>
<div class='commit-subject'>crypto: arm64/aes-blk - honour iv_out requirement in CBC and CTR modes</div><div class='commit-msg'>Update the ARMv8 Crypto Extensions and the plain NEON AES implementations
in CBC and CTR modes to return the next IV back to the skcipher API client.
This is necessary for chaining to work correctly.

Note that for CTR, this is only done if the request is a round multiple of
the block size, since otherwise, chaining is impossible anyway.

Cc: &lt;stable@vger.kernel.org&gt; # v3.16+
Signed-off-by: Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=11e3b725cfc282efe9d4a354153e99d86a16af08'>Diffstat</a> (limited to 'net/802/garp.c')</div><table summary='diffstat' class='diffstat'>