| Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 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 | |
| Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame^] | 22 | int 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_biovec(int type, struct page **pages_in, u64 disk_start, |
| 34 | struct bio_vec *bvec, int vcnt, size_t srclen); |
| 35 | int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page, |
| 36 | unsigned long start_byte, size_t srclen, size_t destlen); |
| 37 | |
| Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 38 | int btrfs_submit_compressed_write(struct inode *inode, u64 start, |
| 39 | unsigned long len, u64 disk_start, |
| 40 | unsigned long compressed_len, |
| 41 | struct page **compressed_pages, |
| 42 | unsigned long nr_pages); |
| 43 | int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, |
| 44 | int mirror_num, unsigned long bio_flags); |
| Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame^] | 45 | |
| 46 | struct btrfs_compress_op { |
| 47 | struct list_head *(*alloc_workspace)(void); |
| 48 | |
| 49 | void (*free_workspace)(struct list_head *workspace); |
| 50 | |
| 51 | int (*compress_pages)(struct list_head *workspace, |
| 52 | struct address_space *mapping, |
| 53 | u64 start, unsigned long len, |
| 54 | struct page **pages, |
| 55 | unsigned long nr_dest_pages, |
| 56 | unsigned long *out_pages, |
| 57 | unsigned long *total_in, |
| 58 | unsigned long *total_out, |
| 59 | unsigned long max_out); |
| 60 | |
| 61 | int (*decompress_biovec)(struct list_head *workspace, |
| 62 | struct page **pages_in, |
| 63 | u64 disk_start, |
| 64 | struct bio_vec *bvec, |
| 65 | int vcnt, |
| 66 | size_t srclen); |
| 67 | |
| 68 | int (*decompress)(struct list_head *workspace, |
| 69 | unsigned char *data_in, |
| 70 | struct page *dest_page, |
| 71 | unsigned long start_byte, |
| 72 | size_t srclen, size_t destlen); |
| 73 | }; |
| 74 | |
| 75 | extern struct btrfs_compress_op btrfs_zlib_compress; |
| 76 | |
| Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 77 | #endif |