diff options
Diffstat (limited to 'include/linux/bio.h')
| -rw-r--r-- | include/linux/bio.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index c4dd287dd1c8d9..601531cf4976f1 100644 --- 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 */ |