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233886dd32
bio_list_merge() should do nothing if the second list is empty - not oops. Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
71 lines
1 KiB
C
71 lines
1 KiB
C
/*
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* Copyright (C) 2004 Red Hat UK Ltd.
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*
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* This file is released under the GPL.
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*/
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#ifndef DM_BIO_LIST_H
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#define DM_BIO_LIST_H
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#include <linux/bio.h>
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struct bio_list {
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struct bio *head;
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struct bio *tail;
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};
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static inline void bio_list_init(struct bio_list *bl)
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{
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bl->head = bl->tail = NULL;
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}
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static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
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{
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bio->bi_next = NULL;
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if (bl->tail)
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bl->tail->bi_next = bio;
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else
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bl->head = bio;
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bl->tail = bio;
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}
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static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
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{
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if (!bl2->head)
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return;
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if (bl->tail)
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bl->tail->bi_next = bl2->head;
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else
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bl->head = bl2->head;
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bl->tail = bl2->tail;
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}
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static inline struct bio *bio_list_pop(struct bio_list *bl)
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{
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struct bio *bio = bl->head;
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if (bio) {
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bl->head = bl->head->bi_next;
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if (!bl->head)
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bl->tail = NULL;
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bio->bi_next = NULL;
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}
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return bio;
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}
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static inline struct bio *bio_list_get(struct bio_list *bl)
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{
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struct bio *bio = bl->head;
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bl->head = bl->tail = NULL;
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return bio;
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}
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#endif
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