xfs: Improve scalability of busy extent tracking

[safe/jmp/linux-2.6] / fs / jffs2 / compr_zlib.c

diff --git a/fs/jffs2/compr_zlib.c b/fs/jffs2/compr_zlib.c
index 83f7e07..b46661a 100644 (file)
--- a/fs/jffs2/compr_zlib.c
+++ b/fs/jffs2/compr_zlib.c
@@ -1,45 +1,41 @@
 /*
  * JFFS2 -- Journalling Flash File System, Version 2.
  *
- * Copyright (C) 2001-2003 Red Hat, Inc.
+ * Copyright © 2001-2007 Red Hat, Inc.
  *
  * Created by David Woodhouse <dwmw2@infradead.org>
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: compr_zlib.c,v 1.31 2005/05/20 19:30:06 gleixner Exp $
- *
  */
 
 #if !defined(__KERNEL__) && !defined(__ECOS)
 #error "The userspace support got too messy and was removed. Update your mkfs.jffs2"
 #endif
 
-#include <linux/config.h>
 #include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
 #include <linux/zlib.h>
 #include <linux/zutil.h>
 #include "nodelist.h"
 #include "compr.h"
 
-       /* Plan: call deflate() with avail_in == *sourcelen, 
-               avail_out = *dstlen - 12 and flush == Z_FINISH. 
+       /* Plan: call deflate() with avail_in == *sourcelen,
+               avail_out = *dstlen - 12 and flush == Z_FINISH.
                If it doesn't manage to finish, call it again with
                avail_in == 0 and avail_out set to the remaining 12
-               bytes for it to clean up. 
+               bytes for it to clean up.
           Q: Is 12 bytes sufficient?
        */
 #define STREAM_END_SPACE 12
 
-static DECLARE_MUTEX(deflate_sem);
-static DECLARE_MUTEX(inflate_sem);
+static DEFINE_MUTEX(deflate_mutex);
+static DEFINE_MUTEX(inflate_mutex);
 static z_stream inf_strm, def_strm;
 
 #ifdef __KERNEL__ /* Linux-only */
 #include <linux/vmalloc.h>
 #include <linux/init.h>
+#include <linux/mutex.h>
 
 static int __init alloc_workspaces(void)
 {
@@ -79,17 +75,17 @@ static int jffs2_zlib_compress(unsigned char *data_in,
        if (*dstlen <= STREAM_END_SPACE)
                return -1;
 
-       down(&deflate_sem);
+       mutex_lock(&deflate_mutex);
 
        if (Z_OK != zlib_deflateInit(&def_strm, 3)) {
                printk(KERN_WARNING "deflateInit failed\n");
-               up(&deflate_sem);
+               mutex_unlock(&deflate_mutex);
                return -1;
        }
 
        def_strm.next_in = data_in;
        def_strm.total_in = 0;
-       
+
        def_strm.next_out = cpage_out;
        def_strm.total_out = 0;
 
@@ -99,12 +95,12 @@ static int jffs2_zlib_compress(unsigned char *data_in,
                D1(printk(KERN_DEBUG "calling deflate with avail_in %d, avail_out %d\n",
                          def_strm.avail_in, def_strm.avail_out));
                ret = zlib_deflate(&def_strm, Z_PARTIAL_FLUSH);
-               D1(printk(KERN_DEBUG "deflate returned with avail_in %d, avail_out %d, total_in %ld, total_out %ld\n", 
+               D1(printk(KERN_DEBUG "deflate returned with avail_in %d, avail_out %d, total_in %ld, total_out %ld\n",
                          def_strm.avail_in, def_strm.avail_out, def_strm.total_in, def_strm.total_out));
                if (ret != Z_OK) {
                        D1(printk(KERN_DEBUG "deflate in loop returned %d\n", ret));
                        zlib_deflateEnd(&def_strm);
-                       up(&deflate_sem);
+                       mutex_unlock(&deflate_mutex);
                        return -1;
                }
        }
@@ -133,7 +129,7 @@ static int jffs2_zlib_compress(unsigned char *data_in,
        *sourcelen = def_strm.total_in;
        ret = 0;
  out:
-       up(&deflate_sem);
+       mutex_unlock(&deflate_mutex);
        return ret;
 }
 
@@ -145,12 +141,12 @@ static int jffs2_zlib_decompress(unsigned char *data_in,
        int ret;
        int wbits = MAX_WBITS;
 
-       down(&inflate_sem);
+       mutex_lock(&inflate_mutex);
 
        inf_strm.next_in = data_in;
        inf_strm.avail_in = srclen;
        inf_strm.total_in = 0;
-       
+
        inf_strm.next_out = cpage_out;
        inf_strm.avail_out = destlen;
        inf_strm.total_out = 0;
@@ -173,7 +169,7 @@ static int jffs2_zlib_decompress(unsigned char *data_in,
 
        if (Z_OK != zlib_inflateInit2(&inf_strm, wbits)) {
                printk(KERN_WARNING "inflateInit failed\n");
-               up(&inflate_sem);
+               mutex_unlock(&inflate_mutex);
                return 1;
        }
 
@@ -183,8 +179,8 @@ static int jffs2_zlib_decompress(unsigned char *data_in,
                printk(KERN_NOTICE "inflate returned %d\n", ret);
        }
        zlib_inflateEnd(&inf_strm);
-       up(&inflate_sem);
-        return 0;
+       mutex_unlock(&inflate_mutex);
+       return 0;
 }
 
 static struct jffs2_compressor jffs2_zlib_comp = {
@@ -206,11 +202,11 @@ int __init jffs2_zlib_init(void)
 
     ret = alloc_workspaces();
     if (ret)
-        return ret;
+           return ret;
 
     ret = jffs2_register_compressor(&jffs2_zlib_comp);
     if (ret)
-        free_workspaces();
+           free_workspaces();
 
     return ret;
 }