projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| c8b97818 CM |
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 | ||
| 143bede5 | 22 | void btrfs_init_compress(void); |
| 261507a0 LZ |
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); | |
| 261507a0 LZ |
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); | |
| 3a39c18d LZ |
35 | int btrfs_decompress_buf2page(char *buf, unsigned long buf_start, |
| 36 | unsigned long total_out, u64 disk_start, | |
| 974b1adc | 37 | struct bio *bio); |
| 261507a0 | 38 | |
| c8b97818 CM |
39 | int btrfs_submit_compressed_write(struct inode *inode, u64 start, |
| 40 | unsigned long len, u64 disk_start, | |
| 41 | unsigned long compressed_len, | |
| 42 | struct page **compressed_pages, | |
| 43 | unsigned long nr_pages); | |
| 44 | int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, | |
| 45 | int mirror_num, unsigned long bio_flags); | |
| ebb8765b AJ |
46 | |
| 47 | enum btrfs_compression_type { | |
| 48 | BTRFS_COMPRESS_NONE = 0, | |
| 49 | BTRFS_COMPRESS_ZLIB = 1, | |
| 50 | BTRFS_COMPRESS_LZO = 2, | |
| 51 | BTRFS_COMPRESS_TYPES = 2, | |
| 52 | BTRFS_COMPRESS_LAST = 3, | |
| 53 | }; | |
| 54 | ||
| 261507a0 LZ |
55 | struct btrfs_compress_op { |
| 56 | struct list_head *(*alloc_workspace)(void); | |
| 57 | ||
| 58 | void (*free_workspace)(struct list_head *workspace); | |
| 59 | ||
| 60 | int (*compress_pages)(struct list_head *workspace, | |
| 61 | struct address_space *mapping, | |
| 62 | u64 start, unsigned long len, | |
| 63 | struct page **pages, | |
| 64 | unsigned long nr_dest_pages, | |
| 65 | unsigned long *out_pages, | |
| 66 | unsigned long *total_in, | |
| 67 | unsigned long *total_out, | |
| 68 | unsigned long max_out); | |
| 69 | ||
| 974b1adc | 70 | int (*decompress_bio)(struct list_head *workspace, |
| 261507a0 LZ |
71 | struct page **pages_in, |
| 72 | u64 disk_start, | |
| 974b1adc | 73 | struct bio *orig_bio, |
| 261507a0 LZ |
74 | size_t srclen); |
| 75 | ||
| 76 | int (*decompress)(struct list_head *workspace, | |
| 77 | unsigned char *data_in, | |
| 78 | struct page *dest_page, | |
| 79 | unsigned long start_byte, | |
| 80 | size_t srclen, size_t destlen); | |
| 81 | }; | |
| 82 | ||
| e8c9f186 DS |
83 | extern const struct btrfs_compress_op btrfs_zlib_compress; |
| 84 | extern const struct btrfs_compress_op btrfs_lzo_compress; | |
| 261507a0 | 85 | |
| c8b97818 | 86 | #endif |