>From 7665b026ad2b56350267dc2a03150618598372dc Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Date: Thu, 14 Jan 2016 14:48:25 -0500
Subject: bio: have bio_kmap_irq return the size of mapped data
The function bio_kmap_irq is not usable because it does not return the
size of the mapped data.
Fix bio_kmap_irq and __bio_kmap_irq so that they return the size of
mapped data.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
---
include/linux/bio.h | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
Index: linux-2.6/include/linux/bio.h
===================================================================
--- linux-2.6.orig/include/linux/bio.h
+++ linux-2.6/include/linux/bio.h
@@ -549,14 +549,16 @@ static inline void bvec_kunmap_irq(char
#endif
static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter,
- unsigned long *flags)
+ unsigned long *flags, unsigned *size)
{
- return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags);
+ struct bio_vec bv = bio_iter_iovec(bio, iter);
+ *size = bv.bv_len;
+ return bvec_kmap_irq(&bv, flags);
}
#define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
-#define bio_kmap_irq(bio, flags) \
- __bio_kmap_irq((bio), (bio)->bi_iter, (flags))
+#define bio_kmap_irq(bio, flags, size) \
+ __bio_kmap_irq((bio), (bio)->bi_iter, (flags), (size))
#define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
/*
--
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