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Commit 2f8e9140 authored by Liu Bo's avatar Liu Bo Committed by David Sterba
Browse files

Btrfs: new helper btrfs_bio_clone_partial 



This adds a new helper btrfs_bio_clone_partial, it'll allocate a cloned
bio that only owns a part of the original bio's data.

Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 015c1bd9

fs/btrfs/extent_io.c

+18 −0
Original line number Original line Diff line number Diff line
@@ -2720,6 +2720,24 @@ struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) 
	return bio;

	return bio;

}

}





struct bio *btrfs_bio_clone_partial(struct bio *orig, gfp_t gfp_mask,

				    int offset, int size)

{

	struct bio *bio;

	struct btrfs_io_bio *btrfs_bio;



	/* this will never fail when it's backed by a bioset */

	bio = bio_clone_fast(orig, gfp_mask, btrfs_bioset);

	ASSERT(bio);



	btrfs_bio = btrfs_io_bio(bio);

	btrfs_bio->csum = NULL;

	btrfs_bio->csum_allocated = NULL;

	btrfs_bio->end_io = NULL;



	bio_trim(bio, offset >> 9, size >> 9);

	return bio;

}





static int __must_check submit_one_bio(struct bio *bio, int mirror_num,

static int __must_check submit_one_bio(struct bio *bio, int mirror_num,

				       unsigned long bio_flags)

				       unsigned long bio_flags)

fs/btrfs/extent_io.h

+2 −0
Original line number Original line Diff line number Diff line
@@ -467,6 +467,8 @@ btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 
		gfp_t gfp_flags);

		gfp_t gfp_flags);

struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);

struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);

struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);

struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);

struct bio *btrfs_bio_clone_partial(struct bio *orig, gfp_t gfp_mask,

				    int offset, int size);





struct btrfs_fs_info;

struct btrfs_fs_info;

struct btrfs_inode;

struct btrfs_inode;