On Wed, Nov 16, 2016 at 01:52:15PM +0100, Christoph Hellwig wrote:
> And remove the bogus check for a NULL return value from kmap, which
> can't happen. While we're at it: I don't think that kmapping up to 256
> will work without deadlocks on highmem machines, a better idea would
> be to use vm_map_ram to map all of them into a single virtual address
> range. Incidentally that would also simplify the code a lot.
Reviewed-by: Omar Sandoval <osan...@fb.com>
> Signed-off-by: Christoph Hellwig <h...@lst.de>
> ---
> fs/btrfs/check-integrity.c | 30 +++++++++++-------------------
> 1 file changed, 11 insertions(+), 19 deletions(-)
>
> diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
> index a6f657f..86f681f 100644
> --- a/fs/btrfs/check-integrity.c
> +++ b/fs/btrfs/check-integrity.c
> @@ -2819,10 +2819,11 @@ static void __btrfsic_submit_bio(struct bio *bio)
> * btrfsic_mount(), this might return NULL */
> dev_state = btrfsic_dev_state_lookup(bio->bi_bdev);
> if (NULL != dev_state &&
> - (bio_op(bio) == REQ_OP_WRITE) && NULL != bio->bi_io_vec) {
> + (bio_op(bio) == REQ_OP_WRITE) && bio_has_data(bio)) {
> unsigned int i;
> u64 dev_bytenr;
> u64 cur_bytenr;
> + struct bio_vec *bvec;
> int bio_is_patched;
> char **mapped_datav;
>
> @@ -2840,32 +2841,23 @@ static void __btrfsic_submit_bio(struct bio *bio)
> if (!mapped_datav)
> goto leave;
> cur_bytenr = dev_bytenr;
> - for (i = 0; i < bio->bi_vcnt; i++) {
> - BUG_ON(bio->bi_io_vec[i].bv_len != PAGE_SIZE);
> - mapped_datav[i] = kmap(bio->bi_io_vec[i].bv_page);
> - if (!mapped_datav[i]) {
> - while (i > 0) {
> - i--;
> - kunmap(bio->bi_io_vec[i].bv_page);
> - }
> - kfree(mapped_datav);
> - goto leave;
> - }
> +
> + bio_for_each_segment_all(bvec, bio, i) {
> + BUG_ON(bvec->bv_len != PAGE_SIZE);
> + mapped_datav[i] = kmap(bvec->bv_page);
> +
> if (dev_state->state->print_mask &
> BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH_VERBOSE)
> pr_info("#%u: bytenr=%llu, len=%u, offset=%u\n",
> - i, cur_bytenr, bio->bi_io_vec[i].bv_len,
> - bio->bi_io_vec[i].bv_offset);
> - cur_bytenr += bio->bi_io_vec[i].bv_len;
> + i, cur_bytenr, bvec->bv_len,
> bvec->bv_offset);
> + cur_bytenr += bvec->bv_len;
> }
> btrfsic_process_written_block(dev_state, dev_bytenr,
> mapped_datav, bio->bi_vcnt,
> bio, &bio_is_patched,
> NULL, bio->bi_opf);
> - while (i > 0) {
> - i--;
> - kunmap(bio->bi_io_vec[i].bv_page);
> - }
> + bio_for_each_segment_all(bvec, bio, i)
> + kunmap(bvec->bv_page);
> kfree(mapped_datav);
> } else if (NULL != dev_state && (bio->bi_opf & REQ_PREFLUSH)) {
> if (dev_state->state->print_mask &
> --
> 2.1.4
>
> --
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--
Omar
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