1 files changed, 124 insertions, 21 deletions

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 1b16108a5417..7b214fd672a2 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -132,6 +132,7 @@ struct bio {
  * 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)    
@@ -145,20 +146,21 @@ struct bio {
  * bit 2 -- barrier
  *      Insert a serialization point in the IO queue, forcing previously
  *      submitted IO to be completed before this one is issued.
- * bit 3 -- synchronous I/O hint: the block layer will unplug immediately
- *      Note that this does NOT indicate that the IO itself is sync, just
- *      that the block layer will not postpone issue of this IO by plugging.
- * bit 4 -- metadata request
+ * bit 3 -- synchronous I/O hint.
+ * bit 4 -- Unplug the device immediately after submitting this bio.
+ * bit 5 -- metadata request
  *      Used for tracing to differentiate metadata and data IO. May also
  *      get some preferential treatment in the IO scheduler
- * bit 5 -- discard sectors
+ * bit 6 -- 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.
- * bit 6 -- fail fast device errors
- * bit 7 -- fail fast transport errors
- * bit 8 -- fail fast driver errors
+ * bit 7 -- fail fast device errors
+ * bit 8 -- fail fast transport errors
+ * bit 9 -- fail fast driver errors
  *      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.
  */
 #define BIO_RW          0       /* Must match RW in req flags (blkdev.h) */
 #define BIO_RW_AHEAD    1       /* Must match FAILFAST in req flags */
@@ -170,6 +172,7 @@ struct bio {
 #define BIO_RW_FAILFAST_DEV             7
 #define BIO_RW_FAILFAST_TRANSPORT       8
 #define BIO_RW_FAILFAST_DRIVER          9
+#define BIO_RW_NOIDLE   10
 
 #define bio_rw_flagged(bio, flag)       ((bio)->bi_rw & (1 << (flag)))
 
@@ -188,6 +191,7 @@ struct bio {
 #define bio_rw_ahead(bio)       bio_rw_flagged(bio, BIO_RW_AHEAD)
 #define bio_rw_meta(bio)        bio_rw_flagged(bio, BIO_RW_META)
 #define bio_discard(bio)        bio_rw_flagged(bio, BIO_RW_DISCARD)
+#define bio_noidle(bio)         bio_rw_flagged(bio, BIO_RW_NOIDLE)
 
 /*
  * upper 16 bits of bi_rw define the io priority of this bio
@@ -426,9 +430,6 @@ struct bio_set {
         unsigned int front_pad;
 
         mempool_t *bio_pool;
-#if defined(CONFIG_BLK_DEV_INTEGRITY)
-        mempool_t *bio_integrity_pool;
-#endif
         mempool_t *bvec_pool;
 };
 
@@ -504,6 +505,115 @@ static inline int bio_has_data(struct bio *bio)
         return bio && bio->bi_io_vec != NULL;
 }
 
+/*
+ * BIO list managment for use by remapping drivers (e.g. DM or MD).
+ *
+ * A bio_list anchors a singly-linked list of bios chained through the bi_next
+ * member of the bio.  The bio_list also caches the last list member to allow
+ * fast access to the tail.
+ */
+struct bio_list {
+        struct bio *head;
+        struct bio *tail;
+};
+
+static inline int bio_list_empty(const struct bio_list *bl)
+{
+        return bl->head == NULL;
+}
+
+static inline void bio_list_init(struct bio_list *bl)
+{
+        bl->head = bl->tail = NULL;
+}
+
+#define bio_list_for_each(bio, bl) \
+        for (bio = (bl)->head; bio; bio = bio->bi_next)
+
+static inline unsigned bio_list_size(const struct bio_list *bl)
+{
+        unsigned sz = 0;
+        struct bio *bio;
+
+        bio_list_for_each(bio, bl)
+                sz++;
+
+        return sz;
+}
+
+static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
+{
+        bio->bi_next = NULL;
+
+        if (bl->tail)
+                bl->tail->bi_next = bio;
+        else
+                bl->head = bio;
+
+        bl->tail = bio;
+}
+
+static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
+{
+        bio->bi_next = bl->head;
+
+        bl->head = bio;
+
+        if (!bl->tail)
+                bl->tail = bio;
+}
+
+static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
+{
+        if (!bl2->head)
+                return;
+
+        if (bl->tail)
+                bl->tail->bi_next = bl2->head;
+        else
+                bl->head = bl2->head;
+
+        bl->tail = bl2->tail;
+}
+
+static inline void bio_list_merge_head(struct bio_list *bl,
+                                       struct bio_list *bl2)
+{
+        if (!bl2->head)
+                return;
+
+        if (bl->head)
+                bl2->tail->bi_next = bl->head;
+        else
+                bl->tail = bl2->tail;
+
+        bl->head = bl2->head;
+}
+
+static inline struct bio *bio_list_pop(struct bio_list *bl)
+{
+        struct bio *bio = bl->head;
+
+        if (bio) {
+                bl->head = bl->head->bi_next;
+                if (!bl->head)
+                        bl->tail = NULL;
+
+                bio->bi_next = NULL;
+        }
+
+        return bio;
+}
+
+static inline struct bio *bio_list_get(struct bio_list *bl)
+{
+        struct bio *bio = bl->head;
+
+        bl->head = bl->tail = NULL;
+
+        return bio;
+}
+
 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 
 #define bip_vec_idx(bip, idx)   (&(bip->bip_vec[(idx)]))
@@ -519,9 +629,8 @@ static inline int bio_has_data(struct bio *bio)
 
 #define bio_integrity(bio) (bio->bi_integrity != NULL)
 
-extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);
 extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
-extern void bio_integrity_free(struct bio *, struct bio_set *);
+extern void bio_integrity_free(struct bio *);
 extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
 extern int bio_integrity_enabled(struct bio *bio);
 extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
@@ -531,27 +640,21 @@ extern void bio_integrity_endio(struct bio *, int);
 extern void bio_integrity_advance(struct bio *, unsigned int);
 extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
 extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
-extern int bio_integrity_clone(struct bio *, struct bio *, struct bio_set *);
-extern int bioset_integrity_create(struct bio_set *, int);
-extern void bioset_integrity_free(struct bio_set *);
-extern void bio_integrity_init_slab(void);
+extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t);
 
 #else /* CONFIG_BLK_DEV_INTEGRITY */
 
 #define bio_integrity(a)                (0)
-#define bioset_integrity_create(a, b)   (0)
 #define bio_integrity_prep(a)           (0)
 #define bio_integrity_enabled(a)        (0)
 #define bio_integrity_clone(a, b, c)    (0)
-#define bioset_integrity_free(a)        do { } while (0)
-#define bio_integrity_free(a, b)        do { } while (0)
+#define bio_integrity_free(a)           do { } while (0)
 #define bio_integrity_endio(a, b)       do { } while (0)
 #define bio_integrity_advance(a, b)     do { } while (0)
 #define bio_integrity_trim(a, b, c)     do { } while (0)
 #define bio_integrity_split(a, b, c)    do { } while (0)
 #define bio_integrity_set_tag(a, b, c)  do { } while (0)
 #define bio_integrity_get_tag(a, b, c)  do { } while (0)
-#define bio_integrity_init_slab(a)      do { } while (0)
 
 #endif /* CONFIG_BLK_DEV_INTEGRITY */