VServer 1.9.2 (patch-2.6.8.1-vs1.9.2.diff)

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

diff --git a/include/linux/bio.h b/include/linux/bio.h
index c4dd287..b90e06c 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 +120,7 @@ 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_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
 
 /*
@@ -246,9 +265,11 @@ 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
 /*