btrfs: reduce the size of compressed_bio

btrfs: reduce the size of compressed_bio

The member compressed_bio::compressed_len can be replaced by the bio
size, as we always submit the full compressed data without any partial
read/write.

Furthermore we already have enough ASSERT()s making sure the bio size
matches the ordered extent or the extent map.

This saves 8 bytes from compressed_bio:

Before:

struct compressed_bio {
        u64                        start;                /*     0     8 */
        unsigned int               len;                  /*     8     4 */
        unsigned int               compressed_len;       /*    12     4 */
        u8                         compress_type;        /*    16     1 */
        bool                       writeback;            /*    17     1 */

        /* XXX 6 bytes hole, try to pack */

        struct btrfs_bio *         orig_bbio;            /*    24     8 */
        struct btrfs_bio           bbio __attribute__((__aligned__(8))); /*    32   304 */

        /* XXX last struct has 1 bit hole */

        /* size: 336, cachelines: 6, members: 7 */
        /* sum members: 330, holes: 1, sum holes: 6 */
        /* member types with bit holes: 1, total: 1 */
        /* forced alignments: 1 */
        /* last cacheline: 16 bytes */
} __attribute__((__aligned__(8)));

After:

 struct compressed_bio {
        u64                        start;                /*     0     8 */
        unsigned int               len;                  /*     8     4 */
        u8                         compress_type;        /*    12     1 */
        bool                       writeback;            /*    13     1 */

        /* XXX 2 bytes hole, try to pack */

        struct btrfs_bio *         orig_bbio;            /*    16     8 */
        struct btrfs_bio           bbio __attribute__((__aligned__(8))); /*    24   304 */

        /* XXX last struct has 1 bit hole */

        /* size: 328, cachelines: 6, members: 6 */
        /* sum members: 326, holes: 1, sum holes: 2 */
        /* member types with bit holes: 1, total: 1 */
        /* forced alignments: 1 */
        /* last cacheline: 8 bytes */
} __attribute__((__aligned__(8)));

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>