/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2007 Nokia Corporation. All rights reserved.
 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
 *
 * Created by Richard Purdie <rpurdie@openedhand.com>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/lzo.h>
#include "compr.h"

static void *lzo_mem;
static void *lzo_compress_buf;
static DEFINE_MUTEX(deflate_mutex);	/* for lzo_mem and lzo_compress_buf */

static void free_workspace(void)
{
	vfree(lzo_mem);
	vfree(lzo_compress_buf);
}

static int __init alloc_workspace(void)
{
	lzo_mem = vmalloc(LZO1X_MEM_COMPRESS);
	lzo_compress_buf = vmalloc(lzo1x_worst_compress(PAGE_SIZE));

	if (!lzo_mem || !lzo_compress_buf) {
		free_workspace();
		return -ENOMEM;
	}

	return 0;
}

static int jffs2_lzo_compress(unsigned char *data_in, unsigned char *cpage_out,
			      uint32_t *sourcelen, uint32_t *dstlen)
{
	size_t compress_size;
	int ret;

	mutex_lock(&deflate_mutex);
	ret = lzo1x_1_compress(data_in, *sourcelen, lzo_compress_buf, &compress_size, lzo_mem);
	if (ret != LZO_E_OK)
		goto fail;

	if (compress_size > *dstlen)
		goto fail;

	memcpy(cpage_out, lzo_compress_buf, compress_size);
	mutex_unlock(&deflate_mutex);

	*dstlen = compress_size;
	return 0;

 fail:
	mutex_unlock(&deflate_mutex);
	return -1;
}

static int jffs2_lzo_decompress(unsigned char *data_in, unsigned char *cpage_out,
				 uint32_t srclen, uint32_t destlen)
{
	size_t dl = destlen;
	int ret;

	ret = lzo1x_decompress_safe(data_in, srclen, cpage_out, &dl);

	if (ret != LZO_E_OK || dl != destlen)
		return -1;

	return 0;
}

static struct jffs2_compressor jffs2_lzo_comp = {
	.priority = JFFS2_LZO_PRIORITY,
	.name = "lzo",
	.compr = JFFS2_COMPR_LZO,
	.compress = &jffs2_lzo_compress,
	.decompress = &jffs2_lzo_decompress,
	.disabled = 0,
};

int __init jffs2_lzo_init(void)
{
	int ret;

	ret = alloc_workspace();
	if (ret < 0)
		return ret;

	ret = jffs2_register_compressor(&jffs2_lzo_comp);
	if (ret)
		free_workspace();

	return ret;
}

void jffs2_lzo_exit(void)
{
	jffs2_unregister_compressor(&jffs2_lzo_comp);
	free_workspace();
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing'>testing</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests'>selftests</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/powerpc'>powerpc</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/powerpc/scripts'>scripts</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/powerpc/scripts?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/testing/selftests/powerpc/scripts?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/'>f63906f41699c8e38af9d12b063e2ceab0286ef2</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/testing/selftests/powerpc/scripts'>tools/testing/selftests/powerpc/scripts</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/powerpc/scripts?id=e34bac726d27056081d0250c0e173e4b155aa340'>e34bac726d27056081d0250c0e173e4b155aa340</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/testing/selftests/powerpc/scripts?id2=e34bac726d27056081d0250c0e173e4b155aa340'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/powerpc/scripts?id=868c97a846a73e937d835b09b8c885a69df50ec8'>868c97a846a73e937d835b09b8c885a69df50ec8</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/testing/selftests/powerpc/scripts?id2=868c97a846a73e937d835b09b8c885a69df50ec8'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'docs-4.10' of git://git.lwn.net/linux<span class='decoration'><a class='deco' href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/powerpc/scripts?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>HEAD</a><a class='branch-deco' href='/cgit.cgi/linux/net-next.git/log/tools/testing/selftests/powerpc/scripts'>master</a></span></div><div class='commit-msg'>Pull documentation update from Jonathan Corbet:
 "These are the documentation changes for 4.10.

  It's another busy cycle for the docs tree, as the sphinx conversion
  continues. Highlights include:

   - Further work on PDF output, which remains a bit of a pain but
     should be more solid now.

   - Five more DocBook template files converted to Sphinx. Only 27 to
     go... Lots of plain-text files have also been converted and
     integrated.

   - Images in binary formats have been replaced with more
     source-friendly versions.

   - Various bits of organizational work, including the renaming of
     various files discussed at the kernel summit.

   - New documentation for the device_link mechanism.

  ... and, of course, lots of typo fixes and small updates"

* tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits)
  dma-buf: Extract dma-buf.rst
  Update Documentation/00-INDEX
  docs: 00-INDEX: document directories/files with no docs
  docs: 00-INDEX: remove non-existing entries
  docs: 00-INDEX: add missing entries for documentation files/dirs
  docs: 00-INDEX: consolidate process/ and admin-guide/ description
  scripts: add a script to check if Documentation/00-INDEX is sane
  Docs: change sh -&gt; awk in REPORTING-BUGS
  Documentation/core-api/device_link: Add initial documentation
  core-api: remove an unexpected unident
  ppc/idle: Add documentation for powersave=off
  Doc: Correct typo, "Introdution" =&gt; "Introduction"
  Documentation/atomic_ops.txt: convert to ReST markup
  Documentation/local_ops.txt: convert to ReST markup
  Documentation/assoc_array.txt: convert to ReST markup
  docs-rst: parse-headers.pl: cleanup the documentation
  docs-rst: fix media cleandocs target
  docs-rst: media/Makefile: reorganize the rules
  docs-rst: media: build SVG from graphviz files
  docs-rst: replace bayer.png by a SVG image
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/'>Diffstat</a> (limited to 'tools/testing/selftests/powerpc/scripts')</div><table summary='diffstat' class='diffstat'>