vserver 1.9.5.x5

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

diff --git a/include/linux/bio.h b/include/linux/bio.h
index c4dd287..cd8d47b 100644 (file)
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -25,6 +25,15 @@
 
 /* Platforms may set this to teach the BIO layer about IOMMU hardware. */
 #include <asm/io.h>
+
+#if defined(BIO_VMERGE_MAX_SIZE) && defined(BIO_VMERGE_BOUNDARY)
+#define BIOVEC_VIRT_START_SIZE(x) (bvec_to_phys(x) & (BIO_VMERGE_BOUNDARY - 1))
+#define BIOVEC_VIRT_OVERSIZE(x)        ((x) > BIO_VMERGE_MAX_SIZE)
+#else
+#define BIOVEC_VIRT_START_SIZE(x)      0
+#define BIOVEC_VIRT_OVERSIZE(x)                0
+#endif
+
 #ifndef BIO_VMERGE_BOUNDARY
 #define BIO_VMERGE_BOUNDARY    0
 #endif
@@ -81,6 +90,15 @@ struct bio {
        unsigned short          bi_hw_segments;
 
        unsigned int            bi_size;        /* residual I/O count */
+
+       /*
+        * To keep track of the max hw size, we account for the
+        * sizes of the first and last virtually mergeable segments
+        * in this bio
+        */
+       unsigned int            bi_hw_front_size;
+       unsigned int            bi_hw_back_size;
+
        unsigned int            bi_max_vecs;    /* max bvl_vecs we can hold */
 
        struct bio_vec          *bi_io_vec;     /* the actual vec list */
@@ -102,6 +120,8 @@ struct bio {
 #define BIO_SEG_VALID  3       /* nr_hw_seg 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_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
 
 /*
@@ -141,6 +161,8 @@ struct bio {
 #define bio_data(bio)          (page_address(bio_page((bio))) + bio_offset((bio)))
 #define bio_barrier(bio)       ((bio)->bi_rw & (1 << BIO_RW_BARRIER))
 #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))
 
 /*
  * will die
@@ -166,8 +188,15 @@ struct bio {
 
 #define __BVEC_END(bio)                bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
 #define __BVEC_START(bio)      bio_iovec_idx((bio), (bio)->bi_idx)
+
+/*
+ * allow arch override, for eg virtualized architectures (put in asm/io.h)
+ */
+#ifndef BIOVEC_PHYS_MERGEABLE
 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2)      \
        ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
+#endif
+
 #define BIOVEC_VIRT_MERGEABLE(vec1, vec2)      \
        ((((bvec_to_phys((vec1)) + (vec1)->bv_len) | bvec_to_phys((vec2))) & (BIO_VMERGE_BOUNDARY - 1)) == 0)
 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
@@ -246,9 +275,11 @@ extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
 extern int bio_get_nr_vecs(struct block_device *);
 extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
                                unsigned long, unsigned int, int);
-extern void bio_unmap_user(struct bio *, int);
+extern void bio_unmap_user(struct bio *);
 extern void bio_set_pages_dirty(struct bio *bio);
 extern void bio_check_pages_dirty(struct bio *bio);
+extern struct bio *bio_copy_user(struct request_queue *, unsigned long, unsigned int, int);
+extern int bio_uncopy_user(struct bio *);
 
 #ifdef CONFIG_HIGHMEM
 /*