1 files changed, 8 insertions, 150 deletions

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 7fc5606e6ea5..5274103434ad 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -9,7 +9,7 @@
  *
  * 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.
  *
@@ -28,6 +28,9 @@
 
 #include <asm/io.h>
 
+/* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */
+#include <linux/blk_types.h>
+
 #define BIO_DEBUG
 
 #ifdef BIO_DEBUG
@@ -41,154 +44,6 @@
 #define BIO_MAX_SECTORS         (BIO_MAX_SIZE >> 9)
 
 /*
- * was unsigned short, but we might as well be ready for > 64kB I/O pages
- */
-struct bio_vec {
-        struct page     *bv_page;
-        unsigned int    bv_len;
-        unsigned int    bv_offset;
-};
-
-struct bio_set;
-struct bio;
-struct bio_integrity_payload;
-typedef void (bio_end_io_t) (struct bio *, int);
-typedef void (bio_destructor_t) (struct bio *);
-
-/*
- * main unit of I/O for the block layer and lower layers (ie drivers and
- * stacking drivers)
- */
-struct bio {
-        sector_t                bi_sector;      /* device address in 512 byte
-                                                   sectors */
-        struct bio              *bi_next;       /* request queue link */
-        struct block_device     *bi_bdev;
-        unsigned long           bi_flags;       /* status, command, etc */
-        unsigned long           bi_rw;          /* bottom bits READ/WRITE,
-                                                 * top bits priority
-                                                 */
-
-        unsigned short          bi_vcnt;        /* how many bio_vec's */
-        unsigned short          bi_idx;         /* current index into bvl_vec */
-
-        /* Number of segments in this BIO after
-         * physical address coalescing is performed.
-         */
-        unsigned int            bi_phys_segments;
-
-        unsigned int            bi_size;        /* residual I/O count */
-
-        /*
-         * To keep track of the max segment size, we account for the
-         * sizes of the first and last mergeable segments in this bio.
-         */
-        unsigned int            bi_seg_front_size;
-        unsigned int            bi_seg_back_size;
-
-        unsigned int            bi_max_vecs;    /* max bvl_vecs we can hold */
-
-        unsigned int            bi_comp_cpu;    /* completion CPU */
-
-        atomic_t                bi_cnt;         /* pin count */
-
-        struct bio_vec          *bi_io_vec;     /* the actual vec list */
-
-        bio_end_io_t            *bi_end_io;
-
-        void                    *bi_private;
-#if defined(CONFIG_BLK_DEV_INTEGRITY)
-        struct bio_integrity_payload *bi_integrity;  /* data integrity */
-#endif
-
-        bio_destructor_t        *bi_destructor; /* destructor */
-
-        /*
-         * We can inline a number of vecs at the end of the bio, to avoid
-         * double allocations for a small number of bio_vecs. This member
-         * MUST obviously be kept at the very end of the bio.
-         */
-        struct bio_vec          bi_inline_vecs[0];
-};
-
-/*
- * bio flags
- */
-#define BIO_UPTODATE    0       /* ok after I/O completion */
-#define BIO_RW_BLOCK    1       /* RW_AHEAD set, and read/write would block */
-#define BIO_EOF         2       /* out-out-bounds error */
-#define BIO_SEG_VALID   3       /* bi_phys_segments valid */
-#define BIO_CLONED      4       /* doesn't own data */
-#define BIO_BOUNCED     5       /* bio is a bounce bio */
-#define BIO_USER_MAPPED 6       /* contains user pages */
-#define BIO_EOPNOTSUPP  7       /* not supported */
-#define BIO_CPU_AFFINE  8       /* complete bio on same CPU as submitted */
-#define BIO_NULL_MAPPED 9       /* contains invalid user pages */
-#define BIO_FS_INTEGRITY 10     /* fs owns integrity data, not block layer */
-#define BIO_QUIET       11      /* Make BIO Quiet */
-#define bio_flagged(bio, flag)  ((bio)->bi_flags & (1 << (flag)))
-
-/*
- * top 4 bits of bio flags indicate the pool this bio came from
- */
-#define BIO_POOL_BITS           (4)
-#define BIO_POOL_NONE           ((1UL << BIO_POOL_BITS) - 1)
-#define BIO_POOL_OFFSET         (BITS_PER_LONG - BIO_POOL_BITS)
-#define BIO_POOL_MASK           (1UL << BIO_POOL_OFFSET)
-#define BIO_POOL_IDX(bio)       ((bio)->bi_flags >> BIO_POOL_OFFSET)    
-
-/*
- * bio bi_rw flags
- *
- * bit 0 -- data direction
- *      If not set, bio is a read from device. If set, it's a write to device.
- * bit 1 -- fail fast device errors
- * bit 2 -- fail fast transport errors
- * bit 3 -- fail fast driver errors
- * bit 4 -- rw-ahead when set
- * bit 5 -- barrier
- *      Insert a serialization point in the IO queue, forcing previously
- *      submitted IO to be completed before this one is issued.
- * bit 6 -- synchronous I/O hint.
- * bit 7 -- Unplug the device immediately after submitting this bio.
- * bit 8 -- metadata request
- *      Used for tracing to differentiate metadata and data IO. May also
- *      get some preferential treatment in the IO scheduler
- * bit 9 -- discard sectors
- *      Informs the lower level device that this range of sectors is no longer
- *      used by the file system and may thus be freed by the device. Used
- *      for flash based storage.
- *      Don't want driver retries for any fast fail whatever the reason.
- * bit 10 -- Tell the IO scheduler not to wait for more requests after this
-        one has been submitted, even if it is a SYNC request.
- */
-enum bio_rw_flags {
-        BIO_RW,
-        BIO_RW_FAILFAST_DEV,
-        BIO_RW_FAILFAST_TRANSPORT,
-        BIO_RW_FAILFAST_DRIVER,
-        /* above flags must match REQ_* */
-        BIO_RW_AHEAD,
-        BIO_RW_BARRIER,
-        BIO_RW_SYNCIO,
-        BIO_RW_UNPLUG,
-        BIO_RW_META,
-        BIO_RW_DISCARD,
-        BIO_RW_NOIDLE,
-};
-
-/*
- * First four bits must match between bio->bi_rw and rq->cmd_flags, make
- * that explicit here.
- */
-#define BIO_RW_RQ_MASK          0xf
-
-static inline bool bio_rw_flagged(struct bio *bio, enum bio_rw_flags flag)
-{
-        return (bio->bi_rw & (1 << flag)) != 0;
-}
-
-/*
  * upper 16 bits of bi_rw define the io priority of this bio
  */
 #define BIO_PRIO_SHIFT  (8 * sizeof(unsigned long) - IOPRIO_BITS)
@@ -211,7 +66,10 @@ static inline bool bio_rw_flagged(struct bio *bio, enum bio_rw_flags flag)
 #define bio_offset(bio)         bio_iovec((bio))->bv_offset
 #define bio_segments(bio)       ((bio)->bi_vcnt - (bio)->bi_idx)
 #define bio_sectors(bio)        ((bio)->bi_size >> 9)
-#define bio_empty_barrier(bio)  (bio_rw_flagged(bio, BIO_RW_BARRIER) && !bio_has_data(bio) && !bio_rw_flagged(bio, BIO_RW_DISCARD))
+#define bio_empty_barrier(bio) \
+        ((bio->bi_rw & REQ_HARDBARRIER) && \
+         !bio_has_data(bio) && \
+         !(bio->bi_rw & REQ_DISCARD))
 
 static inline unsigned int bio_cur_bytes(struct bio *bio)
 {