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authorMike Snitzer <snitzer@redhat.com>2016-05-05 11:54:22 -0400
committerJens Axboe <axboe@fb.com>2016-05-05 13:03:29 -0600
commit0ef5a50c1658d4d96a44f145bcb92ff3310c75b1 (patch)
tree19e029301415518262638966d5125ccd1470d39a /block/bio.c
parentbbd848e0fade51ae51dab86a0683069cef89953f (diff)
downloadlinux-0ef5a50c1658d4d96a44f145bcb92ff3310c75b1.tar.bz2
block: make bio_inc_remaining() interface accessible again
Commit 326e1dbb57 ("block: remove management of bi_remaining when restoring original bi_end_io") made bio_inc_remaining() private to bio.c because the only use-case that made sense was confined to the bio_chain() interface. Since that time DM thinp went on to use bio_chain() in its relatively complex implementation of async discard support. That implementation, even when converted over to use the new async __blkdev_issue_discard() interface, depends on deferred completion of the original discard bio -- which is most appropriately implemented using bio_inc_remaining(). DM thinp foolishly duplicated bio_inc_remaining(), local to dm-thin.c as __bio_inc_remaining(), so re-exporting bio_inc_remaining() allows us to put an end to that foolishness. All said, bio_inc_remaining() should really only be used in conjunction with bio_chain(). It isn't intended for generic bio reference counting. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Acked-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/bio.c')
-rw-r--r--block/bio.c11
1 files changed, 0 insertions, 11 deletions
diff --git a/block/bio.c b/block/bio.c
index 807d25e466ec..0e4aa42bc30d 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -311,17 +311,6 @@ static void bio_chain_endio(struct bio *bio)
bio_endio(__bio_chain_endio(bio));
}
-/*
- * Increment chain count for the bio. Make sure the CHAIN flag update
- * is visible before the raised count.
- */
-static inline void bio_inc_remaining(struct bio *bio)
-{
- bio_set_flag(bio, BIO_CHAIN);
- smp_mb__before_atomic();
- atomic_inc(&bio->__bi_remaining);
-}
-
/**
* bio_chain - chain bio completions
* @bio: the target bio