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author | Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> | 2009-06-10 04:38:40 +0000 |
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committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-06-15 16:47:21 +1000 |
commit | 13685a1654b65357fb34066a98ef40445f7820fc (patch) | |
tree | 89a18aa144873b1224618fa399dd6654751ed2b6 | |
parent | powerpc: Use generic atomic64_t implementation on 32-bit processors (diff) | |
download | linux-dev-13685a1654b65357fb34066a98ef40445f7820fc.tar.xz linux-dev-13685a1654b65357fb34066a98ef40445f7820fc.zip |
block: Add bio_list_peek()
Introduce bio_list_peek(), to obtain a pointer to the first bio on the bio_list
without actually removing it from the list. This is needed when you want to
serialize based on the list being empty or not.
Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r-- | include/linux/bio.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index 12737be58601..2a04eb54c0dd 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -590,6 +590,11 @@ static inline void bio_list_merge_head(struct bio_list *bl, bl->head = bl2->head; } +static inline struct bio *bio_list_peek(struct bio_list *bl) +{ + return bl->head; +} + static inline struct bio *bio_list_pop(struct bio_list *bl) { struct bio *bio = bl->head; |