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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: Liu Bo <bo.li.liu@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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2 changed files with 20 additions and 0 deletions
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@ -2720,6 +2720,24 @@ struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
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return bio;
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}
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struct bio *btrfs_bio_clone_partial(struct bio *orig, gfp_t gfp_mask,
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int offset, int size)
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{
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struct bio *bio;
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struct btrfs_io_bio *btrfs_bio;
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/* this will never fail when it's backed by a bioset */
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bio = bio_clone_fast(orig, gfp_mask, btrfs_bioset);
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ASSERT(bio);
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btrfs_bio = btrfs_io_bio(bio);
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btrfs_bio->csum = NULL;
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btrfs_bio->csum_allocated = NULL;
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btrfs_bio->end_io = NULL;
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bio_trim(bio, offset >> 9, size >> 9);
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return bio;
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}
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static int __must_check submit_one_bio(struct bio *bio, int mirror_num,
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unsigned long bio_flags)
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@ -467,6 +467,8 @@ btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
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gfp_t gfp_flags);
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struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
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struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
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struct bio *btrfs_bio_clone_partial(struct bio *orig, gfp_t gfp_mask,
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int offset, int size);
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struct btrfs_fs_info;
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struct btrfs_inode;
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