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authorJens Axboe <axboe@kernel.dk>2019-02-27 13:13:23 -0700
committerJens Axboe <axboe@kernel.dk>2019-03-18 10:44:48 -0600
commit399254aaf4892113c806816f7e64cf40c804d46d (patch)
tree319206f280d9b57c45dfa2a42e869b25270611f4 /fs/block_dev.c
parent875f1d0769cdcfe1596ff0ca609b453359e42ec9 (diff)
block: add BIO_NO_PAGE_REF flag
If bio_iov_iter_get_pages() is called on an iov_iter that is flagged with NO_REF, then we don't need to add a page reference for the pages that we add. Add BIO_NO_PAGE_REF to track this in the bio, so IO completion knows not to drop a reference to these pages. Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/block_dev.c')
-rw-r--r--fs/block_dev.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index e9faa52bb489..78d3257435c0 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -336,12 +336,14 @@ static void blkdev_bio_end_io(struct bio *bio)
if (should_dirty) {
bio_check_pages_dirty(bio);
} else {
- struct bio_vec *bvec;
- int i;
- struct bvec_iter_all iter_all;
+ if (!bio_flagged(bio, BIO_NO_PAGE_REF)) {
+ struct bvec_iter_all iter_all;
+ struct bio_vec *bvec;
+ int i;
- bio_for_each_segment_all(bvec, bio, i, iter_all)
- put_page(bvec->bv_page);
+ bio_for_each_segment_all(bvec, bio, i, iter_all)
+ put_page(bvec->bv_page);
+ }
bio_put(bio);
}
}