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authorMatthew Wilcox (Oracle) <willy@infradead.org>2021-01-29 04:38:57 +0000
committerJens Axboe <axboe@kernel.dk>2021-02-26 15:49:51 -0700
commit5f7136db82996089cdfb2939c7664b29e9da141d (patch)
treef6fb9ac2dafb2ca03002f6c86bc0fb1062fadcfa /include
parent94d4bffdda21baa2c749bc229c41811a7559dd15 (diff)
block: Add bio_max_segs
It's often inconvenient to use BIO_MAX_PAGES due to min() requiring the sign to be the same. Introduce bio_max_segs() and change BIO_MAX_PAGES to be unsigned to make it easier for the users. Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include')
-rw-r--r--include/linux/bio.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 5b468f2242ff..983ed2fe7c85 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -20,7 +20,12 @@
#define BIO_BUG_ON
#endif
-#define BIO_MAX_PAGES 256
+#define BIO_MAX_PAGES 256U
+
+static inline unsigned int bio_max_segs(unsigned int nr_segs)
+{
+ return min(nr_segs, BIO_MAX_PAGES);
+}
#define bio_prio(bio) (bio)->bi_ioprio
#define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio)