4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Javier González <[email protected]> commit cd8ddbf7a5e206fe6995ab0aee245d597dd6a7f2 upstream. When a REQ_FLUSH reaches pblk, the bio cannot be directly completed. Instead, data on the write buffer is flushed and the bio is completed on the completion pah. This might require some sectors to be padded in order to guarantee a successful write. This patch fixes a memory leak on the padded pages. A consequence of this bad free was that internal bios not containing data (only a flush) were not being completed. Fixes: a4bd217b4326 ("lightnvm: physical block device (pblk) target") Signed-off-by: Javier González <[email protected]> Signed-off-by: Matias Bjørling <[email protected]> Signed-off-by: Jens Axboe <[email protected]> Signed-off-by: Sudip Mukherjee <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/lightnvm/pblk-core.c | 1 - drivers/lightnvm/pblk-write.c | 7 ++++++- 2 files changed, 6 insertions(+), 2 deletions(-) --- a/drivers/lightnvm/pblk-core.c +++ b/drivers/lightnvm/pblk-core.c @@ -190,7 +190,6 @@ void pblk_bio_free_pages(struct pblk *pb WARN_ON(off + nr_pages != bio->bi_vcnt); - bio_advance(bio, off * PBLK_EXPOSED_PAGE_SIZE); for (i = off; i < nr_pages + off; i++) { bv = bio->bi_io_vec[i]; mempool_free(bv.bv_page, pblk->page_bio_pool); --- a/drivers/lightnvm/pblk-write.c +++ b/drivers/lightnvm/pblk-write.c @@ -33,6 +33,10 @@ static unsigned long pblk_end_w_bio(stru bio_endio(original_bio); } + if (c_ctx->nr_padded) + pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid, + c_ctx->nr_padded); + #ifdef CONFIG_NVM_DEBUG atomic_long_add(c_ctx->nr_valid, &pblk->sync_writes); #endif @@ -521,7 +525,8 @@ static void pblk_free_write_rqd(struct p struct bio *bio = rqd->bio; if (c_ctx->nr_padded) - pblk_bio_free_pages(pblk, bio, rqd->nr_ppas, c_ctx->nr_padded); + pblk_bio_free_pages(pblk, bio, c_ctx->nr_valid, + c_ctx->nr_padded); } static int pblk_submit_write(struct pblk *pblk)
