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TOMOYO Linux Cross Reference
Linux/fs/btrfs/compression.h

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  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 void btrfs_clear_biovec_end(struct bio_vec *bvec, int vcnt,
 49                                    unsigned long pg_index,
 50                                    unsigned long pg_offset);
 51 
 52 enum btrfs_compression_type {
 53         BTRFS_COMPRESS_NONE  = 0,
 54         BTRFS_COMPRESS_ZLIB  = 1,
 55         BTRFS_COMPRESS_LZO   = 2,
 56         BTRFS_COMPRESS_TYPES = 2,
 57         BTRFS_COMPRESS_LAST  = 3,
 58 };
 59 
 60 struct btrfs_compress_op {
 61         struct list_head *(*alloc_workspace)(void);
 62 
 63         void (*free_workspace)(struct list_head *workspace);
 64 
 65         int (*compress_pages)(struct list_head *workspace,
 66                               struct address_space *mapping,
 67                               u64 start, unsigned long len,
 68                               struct page **pages,
 69                               unsigned long nr_dest_pages,
 70                               unsigned long *out_pages,
 71                               unsigned long *total_in,
 72                               unsigned long *total_out,
 73                               unsigned long max_out);
 74 
 75         int (*decompress_biovec)(struct list_head *workspace,
 76                                  struct page **pages_in,
 77                                  u64 disk_start,
 78                                  struct bio_vec *bvec,
 79                                  int vcnt,
 80                                  size_t srclen);
 81 
 82         int (*decompress)(struct list_head *workspace,
 83                           unsigned char *data_in,
 84                           struct page *dest_page,
 85                           unsigned long start_byte,
 86                           size_t srclen, size_t destlen);
 87 };
 88 
 89 extern const struct btrfs_compress_op btrfs_zlib_compress;
 90 extern const struct btrfs_compress_op btrfs_lzo_compress;
 91 
 92 #endif
 93 

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