block: add support for IO CPU affinity

[linux-2.6-omap-h63xx.git] / include / linux / bio.h

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 2c0c09034fd244d7bb76b99d805936dcc6e8753e..13aba20edb2d9b8030e7338934d5fdf9d0b97021 100644 (file)
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -81,6 +81,8 @@ struct bio {
 
        unsigned int            bi_max_vecs;    /* max bvl_vecs we can hold */
 
+       unsigned int            bi_comp_cpu;    /* completion CPU */
+
        struct bio_vec          *bi_io_vec;     /* the actual vec list */
 
        bio_end_io_t            *bi_end_io;
@@ -105,6 +107,7 @@ struct bio {
 #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_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
 
 /*
@@ -342,6 +345,14 @@ void zero_fill_bio(struct bio *bio);
 extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
 extern unsigned int bvec_nr_vecs(unsigned short idx);
 
+/*
+ * Allow queuer to specify a completion CPU for this bio
+ */
+static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu)
+{
+       bio->bi_comp_cpu = cpu;
+}
+
 /*
  * bio_set is used to allow other portions of the IO system to
  * allocate their own private memory pools for bio and iovec structures.