Christoph pointed out that bio allocations backed by a bioset will never
fail. As we always use a bioset for all bio allocations, we can skip
the error handling. This patch adjusts our low-level helpers, the
cascaded changes to all callers will come next.
CC: Christoph Hellwig <h...@lst.de>
CC: Liu Bo <bo.li....@oracle.com>
Signed-off-by: David Sterba <dste...@suse.com>
---
fs/btrfs/extent_io.c | 50 +++++++++++++++++++-------------------------------
1 file changed, 19 insertions(+), 31 deletions(-)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 5909f8214255..78a787c36a35 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2659,8 +2659,9 @@ static void end_bio_extent_readpage(struct bio *bio)
}
/*
- * this allocates from the btrfs_bioset. We're returning a bio right now
- * but you can call btrfs_io_bio for the appropriate container_of magic
+ * The following helpers allocate a bio. As it's backed by a bioset, it'll
+ * never fail. We're returning a bio right now but you can call btrfs_io_bio
+ * for the appropriate container_of magic
*/
struct bio *
btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
@@ -2670,22 +2671,12 @@ btrfs_bio_alloc(struct block_device *bdev, u64
first_sector, int nr_vecs,
struct bio *bio;
bio = bio_alloc_bioset(gfp_flags, nr_vecs, btrfs_bioset);
-
- if (bio == NULL && (current->flags & PF_MEMALLOC)) {
- while (!bio && (nr_vecs /= 2)) {
- bio = bio_alloc_bioset(gfp_flags,
- nr_vecs, btrfs_bioset);
- }
- }
-
- if (bio) {
- bio->bi_bdev = bdev;
- bio->bi_iter.bi_sector = first_sector;
- btrfs_bio = btrfs_io_bio(bio);
- btrfs_bio->csum = NULL;
- btrfs_bio->csum_allocated = NULL;
- btrfs_bio->end_io = NULL;
- }
+ bio->bi_bdev = bdev;
+ bio->bi_iter.bi_sector = first_sector;
+ btrfs_bio = btrfs_io_bio(bio);
+ btrfs_bio->csum = NULL;
+ btrfs_bio->csum_allocated = NULL;
+ btrfs_bio->end_io = NULL;
return bio;
}
@@ -2694,29 +2685,26 @@ struct bio *btrfs_bio_clone(struct bio *bio, gfp_t
gfp_mask)
struct btrfs_io_bio *btrfs_bio;
struct bio *new;
+ /* Bio allocation backed by a bioset does not fail */
new = bio_clone_fast(bio, gfp_mask, btrfs_bioset);
- if (new) {
- btrfs_bio = btrfs_io_bio(new);
- btrfs_bio->csum = NULL;
- btrfs_bio->csum_allocated = NULL;
- btrfs_bio->end_io = NULL;
- }
+ btrfs_bio = btrfs_io_bio(new);
+ btrfs_bio->csum = NULL;
+ btrfs_bio->csum_allocated = NULL;
+ btrfs_bio->end_io = NULL;
return new;
}
-/* this also allocates from the btrfs_bioset */
struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
{
struct btrfs_io_bio *btrfs_bio;
struct bio *bio;
+ /* Bio allocation backed by a bioset does not fail */
bio = bio_alloc_bioset(gfp_mask, nr_iovecs, btrfs_bioset);
- if (bio) {
- btrfs_bio = btrfs_io_bio(bio);
- btrfs_bio->csum = NULL;
- btrfs_bio->csum_allocated = NULL;
- btrfs_bio->end_io = NULL;
- }
+ btrfs_bio = btrfs_io_bio(bio);
+ btrfs_bio->csum = NULL;
+ btrfs_bio->csum_allocated = NULL;
+ btrfs_bio->end_io = NULL;
return bio;
}
--
2.12.0
--
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