1 files changed, 0 insertions, 427 deletions

diff --git a/ANDROID_3.4.5/fs/btrfs/lzo.c b/ANDROID_3.4.5/fs/btrfs/lzo.c
deleted file mode 100644
index 743b86fa..00000000
--- a/ANDROID_3.4.5/fs/btrfs/lzo.c
+++ /dev/null
@@ -1,427 +0,0 @@
-/*
- * Copyright (C) 2008 Oracle.  All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License v2 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., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/vmalloc.h>
-#include <linux/init.h>
-#include <linux/err.h>
-#include <linux/sched.h>
-#include <linux/pagemap.h>
-#include <linux/bio.h>
-#include <linux/lzo.h>
-#include "compression.h"
-
-#define LZO_LEN	4
-
-struct workspace {
-	void *mem;
-	void *buf;	/* where compressed data goes */
-	void *cbuf;	/* where decompressed data goes */
-	struct list_head list;
-};
-
-static void lzo_free_workspace(struct list_head *ws)
-{
-	struct workspace *workspace = list_entry(ws, struct workspace, list);
-
-	vfree(workspace->buf);
-	vfree(workspace->cbuf);
-	vfree(workspace->mem);
-	kfree(workspace);
-}
-
-static struct list_head *lzo_alloc_workspace(void)
-{
-	struct workspace *workspace;
-
-	workspace = kzalloc(sizeof(*workspace), GFP_NOFS);
-	if (!workspace)
-		return ERR_PTR(-ENOMEM);
-
-	workspace->mem = vmalloc(LZO1X_MEM_COMPRESS);
-	workspace->buf = vmalloc(lzo1x_worst_compress(PAGE_CACHE_SIZE));
-	workspace->cbuf = vmalloc(lzo1x_worst_compress(PAGE_CACHE_SIZE));
-	if (!workspace->mem || !workspace->buf || !workspace->cbuf)
-		goto fail;
-
-	INIT_LIST_HEAD(&workspace->list);
-
-	return &workspace->list;
-fail:
-	lzo_free_workspace(&workspace->list);
-	return ERR_PTR(-ENOMEM);
-}
-
-static inline void write_compress_length(char *buf, size_t len)
-{
-	__le32 dlen;
-
-	dlen = cpu_to_le32(len);
-	memcpy(buf, &dlen, LZO_LEN);
-}
-
-static inline size_t read_compress_length(char *buf)
-{
-	__le32 dlen;
-
-	memcpy(&dlen, buf, LZO_LEN);
-	return le32_to_cpu(dlen);
-}
-
-static int lzo_compress_pages(struct list_head *ws,
-			      struct address_space *mapping,
-			      u64 start, unsigned long len,
-			      struct page **pages,
-			      unsigned long nr_dest_pages,
-			      unsigned long *out_pages,
-			      unsigned long *total_in,
-			      unsigned long *total_out,
-			      unsigned long max_out)
-{
-	struct workspace *workspace = list_entry(ws, struct workspace, list);
-	int ret = 0;
-	char *data_in;
-	char *cpage_out;
-	int nr_pages = 0;
-	struct page *in_page = NULL;
-	struct page *out_page = NULL;
-	unsigned long bytes_left;
-
-	size_t in_len;
-	size_t out_len;
-	char *buf;
-	unsigned long tot_in = 0;
-	unsigned long tot_out = 0;
-	unsigned long pg_bytes_left;
-	unsigned long out_offset;
-	unsigned long bytes;
-
-	*out_pages = 0;
-	*total_out = 0;
-	*total_in = 0;
-
-	in_page = find_get_page(mapping, start >> PAGE_CACHE_SHIFT);
-	data_in = kmap(in_page);
-
-	/*
-	 * store the size of all chunks of compressed data in
-	 * the first 4 bytes
-	 */
-	out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
-	if (out_page == NULL) {
-		ret = -ENOMEM;
-		goto out;
-	}
-	cpage_out = kmap(out_page);
-	out_offset = LZO_LEN;
-	tot_out = LZO_LEN;
-	pages[0] = out_page;
-	nr_pages = 1;
-	pg_bytes_left = PAGE_CACHE_SIZE - LZO_LEN;
-
-	/* compress at most one page of data each time */
-	in_len = min(len, PAGE_CACHE_SIZE);
-	while (tot_in < len) {
-		ret = lzo1x_1_compress(data_in, in_len, workspace->cbuf,
-				       &out_len, workspace->mem);
-		if (ret != LZO_E_OK) {
-			printk(KERN_DEBUG "btrfs deflate in loop returned %d\n",
-			       ret);
-			ret = -1;
-			goto out;
-		}
-
-		/* store the size of this chunk of compressed data */
-		write_compress_length(cpage_out + out_offset, out_len);
-		tot_out += LZO_LEN;
-		out_offset += LZO_LEN;
-		pg_bytes_left -= LZO_LEN;
-
-		tot_in += in_len;
-		tot_out += out_len;
-
-		/* copy bytes from the working buffer into the pages */
-		buf = workspace->cbuf;
-		while (out_len) {
-			bytes = min_t(unsigned long, pg_bytes_left, out_len);
-
-			memcpy(cpage_out + out_offset, buf, bytes);
-
-			out_len -= bytes;
-			pg_bytes_left -= bytes;
-			buf += bytes;
-			out_offset += bytes;
-
-			/*
-			 * we need another page for writing out.
-			 *
-			 * Note if there's less than 4 bytes left, we just
-			 * skip to a new page.
-			 */
-			if ((out_len == 0 && pg_bytes_left < LZO_LEN) ||
-			    pg_bytes_left == 0) {
-				if (pg_bytes_left) {
-					memset(cpage_out + out_offset, 0,
-					       pg_bytes_left);
-					tot_out += pg_bytes_left;
-				}
-
-				/* we're done, don't allocate new page */
-				if (out_len == 0 && tot_in >= len)
-					break;
-
-				kunmap(out_page);
-				if (nr_pages == nr_dest_pages) {
-					out_page = NULL;
-					ret = -1;
-					goto out;
-				}
-
-				out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
-				if (out_page == NULL) {
-					ret = -ENOMEM;
-					goto out;
-				}
-				cpage_out = kmap(out_page);
-				pages[nr_pages++] = out_page;
-
-				pg_bytes_left = PAGE_CACHE_SIZE;
-				out_offset = 0;
-			}
-		}
-
-		/* we're making it bigger, give up */
-		if (tot_in > 8192 && tot_in < tot_out)
-			goto out;
-
-		/* we're all done */
-		if (tot_in >= len)
-			break;
-
-		if (tot_out > max_out)
-			break;
-
-		bytes_left = len - tot_in;
-		kunmap(in_page);
-		page_cache_release(in_page);
-
-		start += PAGE_CACHE_SIZE;
-		in_page = find_get_page(mapping, start >> PAGE_CACHE_SHIFT);
-		data_in = kmap(in_page);
-		in_len = min(bytes_left, PAGE_CACHE_SIZE);
-	}
-
-	if (tot_out > tot_in)
-		goto out;
-
-	/* store the size of all chunks of compressed data */
-	cpage_out = kmap(pages[0]);
-	write_compress_length(cpage_out, tot_out);
-
-	kunmap(pages[0]);
-
-	ret = 0;
-	*total_out = tot_out;
-	*total_in = tot_in;
-out:
-	*out_pages = nr_pages;
-	if (out_page)
-		kunmap(out_page);
-
-	if (in_page) {
-		kunmap(in_page);
-		page_cache_release(in_page);
-	}
-
-	return ret;
-}
-
-static int lzo_decompress_biovec(struct list_head *ws,
-				 struct page **pages_in,
-				 u64 disk_start,
-				 struct bio_vec *bvec,
-				 int vcnt,
-				 size_t srclen)
-{
-	struct workspace *workspace = list_entry(ws, struct workspace, list);
-	int ret = 0, ret2;
-	char *data_in;
-	unsigned long page_in_index = 0;
-	unsigned long page_out_index = 0;
-	unsigned long total_pages_in = (srclen + PAGE_CACHE_SIZE - 1) /
-					PAGE_CACHE_SIZE;
-	unsigned long buf_start;
-	unsigned long buf_offset = 0;
-	unsigned long bytes;
-	unsigned long working_bytes;
-	unsigned long pg_offset;
-
-	size_t in_len;
-	size_t out_len;
-	unsigned long in_offset;
-	unsigned long in_page_bytes_left;
-	unsigned long tot_in;
-	unsigned long tot_out;
-	unsigned long tot_len;
-	char *buf;
-	bool may_late_unmap, need_unmap;
-
-	data_in = kmap(pages_in[0]);
-	tot_len = read_compress_length(data_in);
-
-	tot_in = LZO_LEN;
-	in_offset = LZO_LEN;
-	tot_len = min_t(size_t, srclen, tot_len);
-	in_page_bytes_left = PAGE_CACHE_SIZE - LZO_LEN;
-
-	tot_out = 0;
-	pg_offset = 0;
-
-	while (tot_in < tot_len) {
-		in_len = read_compress_length(data_in + in_offset);
-		in_page_bytes_left -= LZO_LEN;
-		in_offset += LZO_LEN;
-		tot_in += LZO_LEN;
-
-		tot_in += in_len;
-		working_bytes = in_len;
-		may_late_unmap = need_unmap = false;
-
-		/* fast path: avoid using the working buffer */
-		if (in_page_bytes_left >= in_len) {
-			buf = data_in + in_offset;
-			bytes = in_len;
-			may_late_unmap = true;
-			goto cont;
-		}
-
-		/* copy bytes from the pages into the working buffer */
-		buf = workspace->cbuf;
-		buf_offset = 0;
-		while (working_bytes) {
-			bytes = min(working_bytes, in_page_bytes_left);
-
-			memcpy(buf + buf_offset, data_in + in_offset, bytes);
-			buf_offset += bytes;
-cont:
-			working_bytes -= bytes;
-			in_page_bytes_left -= bytes;
-			in_offset += bytes;
-
-			/* check if we need to pick another page */
-			if ((working_bytes == 0 && in_page_bytes_left < LZO_LEN)
-			    || in_page_bytes_left == 0) {
-				tot_in += in_page_bytes_left;
-
-				if (working_bytes == 0 && tot_in >= tot_len)
-					break;
-
-				if (page_in_index + 1 >= total_pages_in) {
-					ret = -1;
-					goto done;
-				}
-
-				if (may_late_unmap)
-					need_unmap = true;
-				else
-					kunmap(pages_in[page_in_index]);
-
-				data_in = kmap(pages_in[++page_in_index]);
-
-				in_page_bytes_left = PAGE_CACHE_SIZE;
-				in_offset = 0;
-			}
-		}
-
-		out_len = lzo1x_worst_compress(PAGE_CACHE_SIZE);
-		ret = lzo1x_decompress_safe(buf, in_len, workspace->buf,
-					    &out_len);
-		if (need_unmap)
-			kunmap(pages_in[page_in_index - 1]);
-		if (ret != LZO_E_OK) {
-			printk(KERN_WARNING "btrfs decompress failed\n");
-			ret = -1;
-			break;
-		}
-
-		buf_start = tot_out;
-		tot_out += out_len;
-
-		ret2 = btrfs_decompress_buf2page(workspace->buf, buf_start,
-						 tot_out, disk_start,
-						 bvec, vcnt,
-						 &page_out_index, &pg_offset);
-		if (ret2 == 0)
-			break;
-	}
-done:
-	kunmap(pages_in[page_in_index]);
-	return ret;
-}
-
-static int lzo_decompress(struct list_head *ws, unsigned char *data_in,
-			  struct page *dest_page,
-			  unsigned long start_byte,
-			  size_t srclen, size_t destlen)
-{
-	struct workspace *workspace = list_entry(ws, struct workspace, list);
-	size_t in_len;
-	size_t out_len;
-	size_t tot_len;
-	int ret = 0;
-	char *kaddr;
-	unsigned long bytes;
-
-	BUG_ON(srclen < LZO_LEN);
-
-	tot_len = read_compress_length(data_in);
-	data_in += LZO_LEN;
-
-	in_len = read_compress_length(data_in);
-	data_in += LZO_LEN;
-
-	out_len = PAGE_CACHE_SIZE;
-	ret = lzo1x_decompress_safe(data_in, in_len, workspace->buf, &out_len);
-	if (ret != LZO_E_OK) {
-		printk(KERN_WARNING "btrfs decompress failed!\n");
-		ret = -1;
-		goto out;
-	}
-
-	if (out_len < start_byte) {
-		ret = -1;
-		goto out;
-	}
-
-	bytes = min_t(unsigned long, destlen, out_len - start_byte);
-
-	kaddr = kmap_atomic(dest_page);
-	memcpy(kaddr, workspace->buf + start_byte, bytes);
-	kunmap_atomic(kaddr);
-out:
-	return ret;
-}
-
-struct btrfs_compress_op btrfs_lzo_compress = {
-	.alloc_workspace	= lzo_alloc_workspace,
-	.free_workspace		= lzo_free_workspace,
-	.compress_pages		= lzo_compress_pages,
-	.decompress_biovec	= lzo_decompress_biovec,
-	.decompress		= lzo_decompress,
-};