Btrfs: Add zlib compression support

[pandora-kernel.git] / fs / btrfs / compression.h

diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
new file mode 100644 (file)
index 0000000..421f5b4
--- /dev/null
+++ b/fs/btrfs/compression.h
@@ -0,0 +1,47 @@
+/*
+ * 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.
+ */
+
+#ifndef __BTRFS_COMPRESSION_
+#define __BTRFS_COMPRESSION_
+
+int btrfs_zlib_decompress(unsigned char *data_in,
+                         struct page *dest_page,
+                         unsigned long start_byte,
+                         size_t srclen, size_t destlen);
+int btrfs_zlib_compress_pages(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);
+int btrfs_zlib_decompress_biovec(struct page **pages_in,
+                             u64 disk_start,
+                             struct bio_vec *bvec,
+                             int vcnt,
+                             size_t srclen);
+void btrfs_zlib_exit(void);
+int btrfs_submit_compressed_write(struct inode *inode, u64 start,
+                                 unsigned long len, u64 disk_start,
+                                 unsigned long compressed_len,
+                                 struct page **compressed_pages,
+                                 unsigned long nr_pages);
+int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
+                                int mirror_num, unsigned long bio_flags);
+#endif