[mirror_ubuntu-artful-kernel.git] / fs / btrfs / compression.h

/*
 * 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_

void btrfs_init_compress(void);
void btrfs_exit_compress(void);

int btrfs_compress_pages(int type, struct address_space *mapping,
			 u64 start, struct page **pages,
			 unsigned long *out_pages,
			 unsigned long *total_in,
			 unsigned long *total_out,
			 unsigned long max_out);
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(const char *buf, unsigned long buf_start,
			      unsigned long total_out, u64 disk_start,
			      struct bio *bio);

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);

enum btrfs_compression_type {
	BTRFS_COMPRESS_NONE  = 0,
	BTRFS_COMPRESS_ZLIB  = 1,
	BTRFS_COMPRESS_LZO   = 2,
	BTRFS_COMPRESS_TYPES = 2,
	BTRFS_COMPRESS_LAST  = 3,
};

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,
			      struct page **pages,
			      unsigned long *out_pages,
			      unsigned long *total_in,
			      unsigned long *total_out,
			      unsigned long max_out);

	int (*decompress_bio)(struct list_head *workspace,
				 struct page **pages_in,
				 u64 disk_start,
				 struct bio *orig_bio,
				 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 const struct btrfs_compress_op btrfs_zlib_compress;
extern const struct btrfs_compress_op btrfs_lzo_compress;

#endif
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,
38c31464	26	u64 start, struct page **pages,
261507a0 LZ	27	unsigned long *out_pages,
	28	unsigned long *total_in,
	29	unsigned long *total_out,
	30	unsigned long max_out);
261507a0 LZ	31	int btrfs_decompress(int type, unsigned char data_in, struct page dest_page,
261507a0 LZ	32	unsigned long start_byte, size_t srclen, size_t destlen);
14a3357b	33	int btrfs_decompress_buf2page(const char *buf, unsigned long buf_start,
3a39c18d	34	unsigned long total_out, u64 disk_start,
974b1adc	35	struct bio *bio);
261507a0	36
c8b97818 CM	37	int btrfs_submit_compressed_write(struct inode *inode, u64 start,
	38	unsigned long len, u64 disk_start,
	39	unsigned long compressed_len,
	40	struct page **compressed_pages,
	41	unsigned long nr_pages);
	42	int btrfs_submit_compressed_read(struct inode inode, struct bio bio,
	43	int mirror_num, unsigned long bio_flags);
ebb8765b AJ	44
	45	enum btrfs_compression_type {
	46	BTRFS_COMPRESS_NONE = 0,
	47	BTRFS_COMPRESS_ZLIB = 1,
	48	BTRFS_COMPRESS_LZO = 2,
	49	BTRFS_COMPRESS_TYPES = 2,
	50	BTRFS_COMPRESS_LAST = 3,
	51	};
	52
261507a0 LZ	53	struct btrfs_compress_op {
	54	struct list_head (alloc_workspace)(void);
	55
	56	void (free_workspace)(struct list_head workspace);
	57
	58	int (compress_pages)(struct list_head workspace,
	59	struct address_space *mapping,
38c31464	60	u64 start,
261507a0	61	struct page **pages,
261507a0 LZ	62	unsigned long *out_pages,
	63	unsigned long *total_in,
	64	unsigned long *total_out,
	65	unsigned long max_out);
	66
974b1adc	67	int (decompress_bio)(struct list_head workspace,
261507a0 LZ	68	struct page **pages_in,
261507a0 LZ	69	u64 disk_start,
974b1adc	70	struct bio *orig_bio,
261507a0 LZ	71	size_t srclen);
	72
	73	int (decompress)(struct list_head workspace,
	74	unsigned char *data_in,
	75	struct page *dest_page,
	76	unsigned long start_byte,
	77	size_t srclen, size_t destlen);
	78	};
	79
e8c9f186 DS	80	extern const struct btrfs_compress_op btrfs_zlib_compress;
e8c9f186 DS	81	extern const struct btrfs_compress_op btrfs_lzo_compress;
261507a0	82
c8b97818	83	#endif