Merge branch 'for-4.13-part1' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...

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

diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index 680d4265d601a7dbc0ad84750751373a751a6910..87f6d3332163e2949465a9b85f8c7c73d963e584 100644 (file)
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -34,6 +34,45 @@
 /* Maximum size of data before compression */
 #define BTRFS_MAX_UNCOMPRESSED         (SZ_128K)
 
+struct compressed_bio {
+       /* number of bios pending for this compressed extent */
+       refcount_t pending_bios;
+
+       /* the pages with the compressed data on them */
+       struct page **compressed_pages;
+
+       /* inode that owns this data */
+       struct inode *inode;
+
+       /* starting offset in the inode for our pages */
+       u64 start;
+
+       /* number of bytes in the inode we're working on */
+       unsigned long len;
+
+       /* number of bytes on disk */
+       unsigned long compressed_len;
+
+       /* the compression algorithm for this bio */
+       int compress_type;
+
+       /* number of compressed pages in the array */
+       unsigned long nr_pages;
+
+       /* IO errors */
+       int errors;
+       int mirror_num;
+
+       /* for reads, this is the bio we are copying the data into */
+       struct bio *orig_bio;
+
+       /*
+        * the start of a variable length array of checksums only
+        * used by reads
+        */
+       u32 sums;
+};
+
 void btrfs_init_compress(void);
 void btrfs_exit_compress(void);
 
@@ -78,10 +117,7 @@ struct btrfs_compress_op {
                              unsigned long *total_out);
 
        int (*decompress_bio)(struct list_head *workspace,
-                                struct page **pages_in,
-                                u64 disk_start,
-                                struct bio *orig_bio,
-                                size_t srclen);
+                               struct compressed_bio *cb);
 
        int (*decompress)(struct list_head *workspace,
                          unsigned char *data_in,