readahead: introduce PG_readahead

[karo-tx-linux.git] / include / linux / bio.h

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 76bdaeab6f622240fe8f898a9caf0815770f7c38..4d85262b4fa4e8a4e9eb984e668f57363fd09183 100644 (file)
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -70,7 +70,8 @@ typedef void (bio_destructor_t) (struct bio *);
  * stacking drivers)
  */
 struct bio {
-       sector_t                bi_sector;
+       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 */
@@ -148,6 +149,7 @@ struct bio {
 #define BIO_RW_BARRIER 2
 #define BIO_RW_FAILFAST        3
 #define BIO_RW_SYNC    4
+#define BIO_RW_META    5
 
 /*
  * upper 16 bits of bi_rw define the io priority of this bio
@@ -178,6 +180,7 @@ struct bio {
 #define bio_sync(bio)          ((bio)->bi_rw & (1 << BIO_RW_SYNC))
 #define bio_failfast(bio)      ((bio)->bi_rw & (1 << BIO_RW_FAILFAST))
 #define bio_rw_ahead(bio)      ((bio)->bi_rw & (1 << BIO_RW_AHEAD))
+#define bio_rw_meta(bio)       ((bio)->bi_rw & (1 << BIO_RW_META))
 
 /*
  * will die
@@ -273,7 +276,7 @@ extern struct bio_pair *bio_split(struct bio *bi, mempool_t *pool,
 extern mempool_t *bio_split_pool;
 extern void bio_pair_release(struct bio_pair *dbio);
 
-extern struct bio_set *bioset_create(int, int, int);
+extern struct bio_set *bioset_create(int, int);
 extern void bioset_free(struct bio_set *);
 
 extern struct bio *bio_alloc(gfp_t, int);
@@ -306,6 +309,7 @@ extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
                                gfp_t);
 extern void bio_set_pages_dirty(struct bio *bio);
 extern void bio_check_pages_dirty(struct bio *bio);
+extern void bio_release_pages(struct bio *bio);
 extern struct bio *bio_copy_user(struct request_queue *, unsigned long, unsigned int, int);
 extern int bio_uncopy_user(struct bio *);
 void zero_fill_bio(struct bio *bio);