1 /* 2 * Copyright (C) 2008 Oracle. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public 6 * License v2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public 14 * License along with this program; if not, write to the 15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16 * Boston, MA 021110-1307, USA. 17 */ 18 19 #ifndef __BTRFS_COMPRESSION_ 20 #define __BTRFS_COMPRESSION_ 21 22 void btrfs_init_compress(void); 23 void btrfs_exit_compress(void); 24 25 int btrfs_compress_pages(int type, struct address_space *mapping, 26 u64 start, unsigned long len, 27 struct page **pages, 28 unsigned long nr_dest_pages, 29 unsigned long *out_pages, 30 unsigned long *total_in, 31 unsigned long *total_out, 32 unsigned long max_out); 33 int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page, 34 unsigned long start_byte, size_t srclen, size_t destlen); 35 int btrfs_decompress_buf2page(char *buf, unsigned long buf_start, 36 unsigned long total_out, u64 disk_start, 37 struct bio_vec *bvec, int vcnt, 38 unsigned long *pg_index, 39 unsigned long *pg_offset); 40 41 int btrfs_submit_compressed_write(struct inode *inode, u64 start, 42 unsigned long len, u64 disk_start, 43 unsigned long compressed_len, 44 struct page **compressed_pages, 45 unsigned long nr_pages); 46 int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, 47 int mirror_num, unsigned long bio_flags); 48 49 struct btrfs_compress_op { 50 struct list_head *(*alloc_workspace)(void); 51 52 void (*free_workspace)(struct list_head *workspace); 53 54 int (*compress_pages)(struct list_head *workspace, 55 struct address_space *mapping, 56 u64 start, unsigned long len, 57 struct page **pages, 58 unsigned long nr_dest_pages, 59 unsigned long *out_pages, 60 unsigned long *total_in, 61 unsigned long *total_out, 62 unsigned long max_out); 63 64 int (*decompress_biovec)(struct list_head *workspace, 65 struct page **pages_in, 66 u64 disk_start, 67 struct bio_vec *bvec, 68 int vcnt, 69 size_t srclen); 70 71 int (*decompress)(struct list_head *workspace, 72 unsigned char *data_in, 73 struct page *dest_page, 74 unsigned long start_byte, 75 size_t srclen, size_t destlen); 76 }; 77 78 extern struct btrfs_compress_op btrfs_zlib_compress; 79 extern struct btrfs_compress_op btrfs_lzo_compress; 80 81 #endif 82