![Tim Schmielau](/assets/img/avatar_default.png)
After Al Viro (finally) succeeded in removing the sched.h #include in module.h recently, it makes sense again to remove other superfluous sched.h includes. There are quite a lot of files which include it but don't actually need anything defined in there. Presumably these includes were once needed for macros that used to live in sched.h, but moved to other header files in the course of cleaning it up. To ease the pain, this time I did not fiddle with any header files and only removed #includes from .c-files, which tend to cause less trouble. Compile tested against 2.6.20-rc2 and 2.6.20-rc2-mm2 (with offsets) on alpha, arm, i386, ia64, mips, powerpc, and x86_64 with allnoconfig, defconfig, allmodconfig, and allyesconfig as well as a few randconfigs on x86_64 and all configs in arch/arm/configs on arm. I also checked that no new warnings were introduced by the patch (actually, some warnings are removed that were emitted by unnecessarily included header files). Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
222 lines
5.8 KiB
C
222 lines
5.8 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright (C) 2001-2003 Red Hat, Inc.
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*
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* Created by David Woodhouse <dwmw2@infradead.org>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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* $Id: compr_zlib.c,v 1.32 2005/11/07 11:14:38 gleixner Exp $
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*
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*/
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#if !defined(__KERNEL__) && !defined(__ECOS)
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#error "The userspace support got too messy and was removed. Update your mkfs.jffs2"
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#endif
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/zlib.h>
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#include <linux/zutil.h>
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#include "nodelist.h"
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#include "compr.h"
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/* Plan: call deflate() with avail_in == *sourcelen,
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avail_out = *dstlen - 12 and flush == Z_FINISH.
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If it doesn't manage to finish, call it again with
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avail_in == 0 and avail_out set to the remaining 12
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bytes for it to clean up.
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Q: Is 12 bytes sufficient?
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*/
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#define STREAM_END_SPACE 12
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static DEFINE_MUTEX(deflate_mutex);
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static DEFINE_MUTEX(inflate_mutex);
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static z_stream inf_strm, def_strm;
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#ifdef __KERNEL__ /* Linux-only */
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#include <linux/vmalloc.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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static int __init alloc_workspaces(void)
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{
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def_strm.workspace = vmalloc(zlib_deflate_workspacesize());
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if (!def_strm.workspace) {
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printk(KERN_WARNING "Failed to allocate %d bytes for deflate workspace\n", zlib_deflate_workspacesize());
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return -ENOMEM;
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}
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D1(printk(KERN_DEBUG "Allocated %d bytes for deflate workspace\n", zlib_deflate_workspacesize()));
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inf_strm.workspace = vmalloc(zlib_inflate_workspacesize());
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if (!inf_strm.workspace) {
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printk(KERN_WARNING "Failed to allocate %d bytes for inflate workspace\n", zlib_inflate_workspacesize());
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vfree(def_strm.workspace);
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return -ENOMEM;
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}
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D1(printk(KERN_DEBUG "Allocated %d bytes for inflate workspace\n", zlib_inflate_workspacesize()));
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return 0;
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}
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static void free_workspaces(void)
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{
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vfree(def_strm.workspace);
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vfree(inf_strm.workspace);
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}
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#else
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#define alloc_workspaces() (0)
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#define free_workspaces() do { } while(0)
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#endif /* __KERNEL__ */
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static int jffs2_zlib_compress(unsigned char *data_in,
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unsigned char *cpage_out,
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uint32_t *sourcelen, uint32_t *dstlen,
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void *model)
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{
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int ret;
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if (*dstlen <= STREAM_END_SPACE)
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return -1;
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mutex_lock(&deflate_mutex);
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if (Z_OK != zlib_deflateInit(&def_strm, 3)) {
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printk(KERN_WARNING "deflateInit failed\n");
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mutex_unlock(&deflate_mutex);
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return -1;
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}
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def_strm.next_in = data_in;
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def_strm.total_in = 0;
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def_strm.next_out = cpage_out;
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def_strm.total_out = 0;
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while (def_strm.total_out < *dstlen - STREAM_END_SPACE && def_strm.total_in < *sourcelen) {
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def_strm.avail_out = *dstlen - (def_strm.total_out + STREAM_END_SPACE);
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def_strm.avail_in = min((unsigned)(*sourcelen-def_strm.total_in), def_strm.avail_out);
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D1(printk(KERN_DEBUG "calling deflate with avail_in %d, avail_out %d\n",
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def_strm.avail_in, def_strm.avail_out));
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ret = zlib_deflate(&def_strm, Z_PARTIAL_FLUSH);
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D1(printk(KERN_DEBUG "deflate returned with avail_in %d, avail_out %d, total_in %ld, total_out %ld\n",
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def_strm.avail_in, def_strm.avail_out, def_strm.total_in, def_strm.total_out));
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if (ret != Z_OK) {
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D1(printk(KERN_DEBUG "deflate in loop returned %d\n", ret));
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zlib_deflateEnd(&def_strm);
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mutex_unlock(&deflate_mutex);
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return -1;
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}
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}
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def_strm.avail_out += STREAM_END_SPACE;
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def_strm.avail_in = 0;
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ret = zlib_deflate(&def_strm, Z_FINISH);
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zlib_deflateEnd(&def_strm);
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if (ret != Z_STREAM_END) {
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D1(printk(KERN_DEBUG "final deflate returned %d\n", ret));
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ret = -1;
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goto out;
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}
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if (def_strm.total_out >= def_strm.total_in) {
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D1(printk(KERN_DEBUG "zlib compressed %ld bytes into %ld; failing\n",
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def_strm.total_in, def_strm.total_out));
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ret = -1;
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goto out;
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}
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D1(printk(KERN_DEBUG "zlib compressed %ld bytes into %ld\n",
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def_strm.total_in, def_strm.total_out));
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*dstlen = def_strm.total_out;
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*sourcelen = def_strm.total_in;
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ret = 0;
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out:
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mutex_unlock(&deflate_mutex);
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return ret;
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}
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static int jffs2_zlib_decompress(unsigned char *data_in,
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unsigned char *cpage_out,
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uint32_t srclen, uint32_t destlen,
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void *model)
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{
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int ret;
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int wbits = MAX_WBITS;
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mutex_lock(&inflate_mutex);
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inf_strm.next_in = data_in;
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inf_strm.avail_in = srclen;
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inf_strm.total_in = 0;
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inf_strm.next_out = cpage_out;
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inf_strm.avail_out = destlen;
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inf_strm.total_out = 0;
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/* If it's deflate, and it's got no preset dictionary, then
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we can tell zlib to skip the adler32 check. */
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if (srclen > 2 && !(data_in[1] & PRESET_DICT) &&
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((data_in[0] & 0x0f) == Z_DEFLATED) &&
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!(((data_in[0]<<8) + data_in[1]) % 31)) {
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D2(printk(KERN_DEBUG "inflate skipping adler32\n"));
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wbits = -((data_in[0] >> 4) + 8);
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inf_strm.next_in += 2;
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inf_strm.avail_in -= 2;
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} else {
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/* Let this remain D1 for now -- it should never happen */
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D1(printk(KERN_DEBUG "inflate not skipping adler32\n"));
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}
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if (Z_OK != zlib_inflateInit2(&inf_strm, wbits)) {
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printk(KERN_WARNING "inflateInit failed\n");
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mutex_unlock(&inflate_mutex);
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return 1;
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}
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while((ret = zlib_inflate(&inf_strm, Z_FINISH)) == Z_OK)
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;
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if (ret != Z_STREAM_END) {
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printk(KERN_NOTICE "inflate returned %d\n", ret);
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}
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zlib_inflateEnd(&inf_strm);
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mutex_unlock(&inflate_mutex);
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return 0;
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}
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static struct jffs2_compressor jffs2_zlib_comp = {
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.priority = JFFS2_ZLIB_PRIORITY,
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.name = "zlib",
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.compr = JFFS2_COMPR_ZLIB,
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.compress = &jffs2_zlib_compress,
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.decompress = &jffs2_zlib_decompress,
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#ifdef JFFS2_ZLIB_DISABLED
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.disabled = 1,
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#else
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.disabled = 0,
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#endif
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};
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int __init jffs2_zlib_init(void)
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{
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int ret;
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ret = alloc_workspaces();
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if (ret)
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return ret;
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ret = jffs2_register_compressor(&jffs2_zlib_comp);
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if (ret)
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free_workspaces();
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return ret;
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}
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void jffs2_zlib_exit(void)
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{
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jffs2_unregister_compressor(&jffs2_zlib_comp);
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free_workspaces();
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}
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