block: Implement support for WRITE SAME

[mirror_ubuntu-artful-kernel.git] / include / linux / blk_types.h

diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 7b7ac9ccec7af5900b469166e7bdda9aa578b4d2..cdf11191e6450fa680b7a8b71352c3642633b9fb 100644 (file)
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -59,12 +59,6 @@ struct bio {
        unsigned int            bi_seg_front_size;
        unsigned int            bi_seg_back_size;
 
-       unsigned int            bi_max_vecs;    /* max bvl_vecs we can hold */
-
-       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;
@@ -80,7 +74,17 @@ struct bio {
        struct bio_integrity_payload *bi_integrity;  /* data integrity */
 #endif
 
-       bio_destructor_t        *bi_destructor; /* destructor */
+       /*
+        * Everything starting with bi_max_vecs will be preserved by bio_reset()
+        */
+
+       unsigned int            bi_max_vecs;    /* max bvl_vecs we can hold */
+
+       atomic_t                bi_cnt;         /* pin count */
+
+       struct bio_vec          *bi_io_vec;     /* the actual vec list */
+
+       struct bio_set          *bi_pool;
 
        /*
         * We can inline a number of vecs at the end of the bio, to avoid
@@ -90,6 +94,8 @@ struct bio {
        struct bio_vec          bi_inline_vecs[0];
 };
 
+#define BIO_RESET_BYTES                offsetof(struct bio, bi_max_vecs)
+
 /*
  * bio flags
  */
@@ -105,6 +111,13 @@ struct bio {
 #define BIO_FS_INTEGRITY 9     /* fs owns integrity data, not block layer */
 #define BIO_QUIET      10      /* Make BIO Quiet */
 #define BIO_MAPPED_INTEGRITY 11/* integrity metadata has been remapped */
+
+/*
+ * Flags starting here get preserved by bio_reset() - this includes
+ * BIO_POOL_IDX()
+ */
+#define BIO_RESET_BITS 12
+
 #define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
 
 /*
@@ -134,6 +147,7 @@ enum rq_flag_bits {
        __REQ_PRIO,             /* boost priority in cfq */
        __REQ_DISCARD,          /* request to discard sectors */
        __REQ_SECURE,           /* secure discard (used with __REQ_DISCARD) */
+       __REQ_WRITE_SAME,       /* write same block many times */
 
        __REQ_NOIDLE,           /* don't anticipate more IO after this one */
        __REQ_FUA,              /* forced unit access */
@@ -172,15 +186,21 @@ enum rq_flag_bits {
 #define REQ_META               (1 << __REQ_META)
 #define REQ_PRIO               (1 << __REQ_PRIO)
 #define REQ_DISCARD            (1 << __REQ_DISCARD)
+#define REQ_WRITE_SAME         (1 << __REQ_WRITE_SAME)
 #define REQ_NOIDLE             (1 << __REQ_NOIDLE)
 
 #define REQ_FAILFAST_MASK \
        (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
 #define REQ_COMMON_MASK \
        (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \
-        REQ_DISCARD | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | REQ_SECURE)
+        REQ_DISCARD | REQ_WRITE_SAME | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | \
+        REQ_SECURE)
 #define REQ_CLONE_MASK         REQ_COMMON_MASK
 
+/* This mask is used for both bio and request merge checking */
+#define REQ_NOMERGE_FLAGS \
+       (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA)
+
 #define REQ_RAHEAD             (1 << __REQ_RAHEAD)
 #define REQ_THROTTLED          (1 << __REQ_THROTTLED)