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| author | Pavel Begunkov <asml.silence@gmail.com> | 2021-01-09 16:03:02 +0000 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-01-25 08:58:24 -0700 |
| commit | 3e1a88ec96259282b9a8b45c3f1fda7a3ff4f6ea (patch) | |
| tree | e650e34e08f97cadb1d47e9650ff045006bac9be /fs/iomap | |
| parent | 54c8195b4ebe10af66b49ab9c809bc16939555fc (diff) | |
| download | linux-3e1a88ec96259282b9a8b45c3f1fda7a3ff4f6ea.tar.bz2 | |
bio: add a helper calculating nr segments to alloc
Add a helper function calculating the number of bvec segments we need to
allocate to construct a bio. It doesn't change anything functionally,
but will be used to not duplicate special cases in the future.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/iomap')
| -rw-r--r-- | fs/iomap/direct-io.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index 933f234d5bec..ea1e8f696076 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -250,11 +250,8 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length, orig_count = iov_iter_count(dio->submit.iter); iov_iter_truncate(dio->submit.iter, length); - nr_pages = iov_iter_npages(dio->submit.iter, BIO_MAX_PAGES); - if (nr_pages <= 0) { - ret = nr_pages; + if (!iov_iter_count(dio->submit.iter)) goto out; - } if (need_zeroout) { /* zero out from the start of the block to the write offset */ @@ -263,6 +260,7 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length, iomap_dio_zero(dio, iomap, pos - pad, pad); } + nr_pages = bio_iov_vecs_to_alloc(dio->submit.iter, BIO_MAX_PAGES); do { size_t n; if (dio->error) { @@ -308,7 +306,8 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length, dio->size += n; copied += n; - nr_pages = iov_iter_npages(dio->submit.iter, BIO_MAX_PAGES); + nr_pages = bio_iov_vecs_to_alloc(dio->submit.iter, + BIO_MAX_PAGES); iomap_dio_submit_bio(dio, iomap, bio, pos); pos += n; } while (nr_pages); |