Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / fs / btrfs / compression.h

diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index 421f5b4aa7151d4704256222de8e342e8899259d..51000174b9d7ba687f3fda58ab44e6479be24e82 100644 (file)
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -19,24 +19,27 @@
 #ifndef __BTRFS_COMPRESSION_
 #define __BTRFS_COMPRESSION_
 
-int btrfs_zlib_decompress(unsigned char *data_in,
-                         struct page *dest_page,
-                         unsigned long start_byte,
-                         size_t srclen, size_t destlen);
-int btrfs_zlib_compress_pages(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_zlib_decompress_biovec(struct page **pages_in,
-                             u64 disk_start,
-                             struct bio_vec *bvec,
-                             int vcnt,
-                             size_t srclen);
-void btrfs_zlib_exit(void);
+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 *page_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,
@@ -44,4 +47,37 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
                                  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