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- /*
- * 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_init_compress(void);
- void btrfs_exit_compress(void);
- int btrfs_compress_pages(int type, 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_decompress_biovec(int type, struct page **pages_in, u64 disk_start,
- struct bio_vec *bvec, int vcnt, size_t srclen);
- int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page,
- unsigned long start_byte, size_t srclen, size_t destlen);
- int btrfs_decompress_buf2page(char *buf, unsigned long buf_start,
- unsigned long total_out, u64 disk_start,
- struct bio_vec *bvec, int vcnt,
- unsigned long *pg_index,
- unsigned long *pg_offset);
- 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);
- struct btrfs_compress_op {
- struct list_head *(*alloc_workspace)(void);
- void (*free_workspace)(struct list_head *workspace);
- int (*compress_pages)(struct list_head *workspace,
- 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 (*decompress_biovec)(struct list_head *workspace,
- struct page **pages_in,
- u64 disk_start,
- struct bio_vec *bvec,
- int vcnt,
- size_t srclen);
- int (*decompress)(struct list_head *workspace,
- unsigned char *data_in,
- struct page *dest_page,
- unsigned long start_byte,
- size_t srclen, size_t destlen);
- };
- extern struct btrfs_compress_op btrfs_zlib_compress;
- extern struct btrfs_compress_op btrfs_lzo_compress;
- #endif
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