> On 26 Apr 2019, at 15.35, Igor Konopko <igor.j.konopko@xxxxxxxxx> wrote:
>
> This patch changes the approach to handling partial read path.
>
> In old approach merging of data from round buffer and drive was fully
> made by drive. This had some disadvantages - code was complex and
> relies on bio internals, so it was hard to maintain and was strongly
> dependent on bio changes.
>
> In new approach most of the handling is done mostly by block layer
> functions such as bio_split(), bio_chain() and generic_make request()
> and generally is less complex and easier to maintain. Below some more
> details of the new approach.
>
> When read bio arrives, it is cloned for pblk internal purposes. All
> the L2P mapping, which includes copying data from round buffer to bio
> and thus bio_advance() calls is done on the cloned bio, so the original
> bio is untouched. If we found that we have partial read case, we
> still have original bio untouched, so we can split it and continue to
> process only first part of it in current context, when the rest will be
> called as separate bio request which is passed to generic_make_request()
> for further processing.
>
> Signed-off-by: Igor Konopko <igor.j.konopko@xxxxxxxxx>
> ---
> drivers/lightnvm/pblk-core.c | 13 +-
> drivers/lightnvm/pblk-rb.c | 11 +-
> drivers/lightnvm/pblk-read.c | 339 +++++++++++--------------------------------
> drivers/lightnvm/pblk.h | 18 +--
> 4 files changed, 100 insertions(+), 281 deletions(-)
>
> diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
> index 73be3a0..07270ba 100644
> --- a/drivers/lightnvm/pblk-core.c
> +++ b/drivers/lightnvm/pblk-core.c
> @@ -2147,8 +2147,8 @@ void pblk_update_map_dev(struct pblk *pblk, sector_t lba,
> spin_unlock(&pblk->trans_lock);
> }
>
> -void pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas,
> - sector_t blba, int nr_secs)
> +int pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas,
> + sector_t blba, int nr_secs, bool *from_cache)
> {
> int i;
>
> @@ -2162,10 +2162,19 @@ void pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas,
> if (!pblk_ppa_empty(ppa) && !pblk_addr_in_cache(ppa)) {
> struct pblk_line *line = pblk_ppa_to_line(pblk, ppa);
>
> + if (i > 0 && *from_cache)
> + break;
> + *from_cache = false;
> +
> kref_get(&line->ref);
> + } else {
> + if (i > 0 && !*from_cache)
> + break;
> + *from_cache = true;
> }
> }
> spin_unlock(&pblk->trans_lock);
> + return i;
> }
>
> void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas,
> diff --git a/drivers/lightnvm/pblk-rb.c b/drivers/lightnvm/pblk-rb.c
> index 3555014..5abb170 100644
> --- a/drivers/lightnvm/pblk-rb.c
> +++ b/drivers/lightnvm/pblk-rb.c
> @@ -642,7 +642,7 @@ unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct nvm_rq *rqd,
> * be directed to disk.
> */
> int pblk_rb_copy_to_bio(struct pblk_rb *rb, struct bio *bio, sector_t lba,
> - struct ppa_addr ppa, int bio_iter, bool advanced_bio)
> + struct ppa_addr ppa)
> {
> struct pblk *pblk = container_of(rb, struct pblk, rwb);
> struct pblk_rb_entry *entry;
> @@ -673,15 +673,6 @@ int pblk_rb_copy_to_bio(struct pblk_rb *rb, struct bio *bio, sector_t lba,
> ret = 0;
> goto out;
> }
> -
> - /* Only advance the bio if it hasn't been advanced already. If advanced,
> - * this bio is at least a partial bio (i.e., it has partially been
> - * filled with data from the cache). If part of the data resides on the
> - * media, we will read later on
> - */
> - if (unlikely(!advanced_bio))
> - bio_advance(bio, bio_iter * PBLK_EXPOSED_PAGE_SIZE);
> -
> data = bio_data(bio);
> memcpy(data, entry->data, rb->seg_size);
>
> diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c
> index f5f155d..d98ea39 100644
> --- a/drivers/lightnvm/pblk-read.c
> +++ b/drivers/lightnvm/pblk-read.c
> @@ -26,8 +26,7 @@
> * issued.
> */
> static int pblk_read_from_cache(struct pblk *pblk, struct bio *bio,
> - sector_t lba, struct ppa_addr ppa,
> - int bio_iter, bool advanced_bio)
> + sector_t lba, struct ppa_addr ppa)
> {
> #ifdef CONFIG_NVM_PBLK_DEBUG
> /* Callers must ensure that the ppa points to a cache address */
> @@ -35,73 +34,75 @@ static int pblk_read_from_cache(struct pblk *pblk, struct bio *bio,
> BUG_ON(!pblk_addr_in_cache(ppa));
> #endif
>
> - return pblk_rb_copy_to_bio(&pblk->rwb, bio, lba, ppa,
> - bio_iter, advanced_bio);
> + return pblk_rb_copy_to_bio(&pblk->rwb, bio, lba, ppa);
> }
>
> -static void pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd,
> +static int pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd,
> struct bio *bio, sector_t blba,
> - unsigned long *read_bitmap)
> + bool *from_cache)
> {
> void *meta_list = rqd->meta_list;
> - struct ppa_addr ppas[NVM_MAX_VLBA];
> - int nr_secs = rqd->nr_ppas;
> - bool advanced_bio = false;
> - int i, j = 0;
> + int nr_secs, i;
>
> - pblk_lookup_l2p_seq(pblk, ppas, blba, nr_secs);
> +retry:
> + nr_secs = pblk_lookup_l2p_seq(pblk, rqd->ppa_list, blba, rqd->nr_ppas,
> + from_cache);
> +
> + if (!*from_cache)
> + goto end;
>
> for (i = 0; i < nr_secs; i++) {
> - struct ppa_addr p = ppas[i];
> struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i);
> sector_t lba = blba + i;
>
> -retry:
> - if (pblk_ppa_empty(p)) {
> + if (pblk_ppa_empty(rqd->ppa_list[i])) {
> __le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
>
> - WARN_ON(test_and_set_bit(i, read_bitmap));
> meta->lba = addr_empty;
> -
> - if (unlikely(!advanced_bio)) {
> - bio_advance(bio, (i) * PBLK_EXPOSED_PAGE_SIZE);
> - advanced_bio = true;
> + } else if (pblk_addr_in_cache(rqd->ppa_list[i])) {
> + /*
> + * Try to read from write buffer. The address is later
> + * checked on the write buffer to prevent retrieving
> + * overwritten data.
> + */
> + if (!pblk_read_from_cache(pblk, bio, lba,
> + rqd->ppa_list[i])) {
> + if (i == 0) {
> + /*
> + * We didn't call with bio_advance()
> + * yet, so we can just retry.
> + */
> + goto retry;
> + } else {
> + /*
> + * We already call bio_advance()
> + * so we cannot retry and we need
> + * to quit that function in order
> + * to allow caller to handle the bio
> + * splitting in the current sector
> + * position.
> + */
> + nr_secs = i;
> + goto end;
> + }
> }
> -
> - goto next;
> - }
> -
> - /* Try to read from write buffer. The address is later checked
> - * on the write buffer to prevent retrieving overwritten data.
> - */
> - if (pblk_addr_in_cache(p)) {
> - if (!pblk_read_from_cache(pblk, bio, lba, p, i,
> - advanced_bio)) {
> - pblk_lookup_l2p_seq(pblk, &p, lba, 1);
> - goto retry;
> - }
> - WARN_ON(test_and_set_bit(i, read_bitmap));
> meta->lba = cpu_to_le64(lba);
> - advanced_bio = true;
> #ifdef CONFIG_NVM_PBLK_DEBUG
> atomic_long_inc(&pblk->cache_reads);
> #endif
> - } else {
> - /* Read from media non-cached sectors */
> - rqd->ppa_list[j++] = p;
> }
> -
> -next:
> - if (advanced_bio)
> - bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE);
> + bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE);
> }
>
> +end:
> if (pblk_io_aligned(pblk, nr_secs))
> rqd->is_seq = 1;
>
> #ifdef CONFIG_NVM_PBLK_DEBUG
> atomic_long_add(nr_secs, &pblk->inflight_reads);
> #endif
> +
> + return nr_secs;
> }
>
>
> @@ -197,9 +198,7 @@ static void __pblk_end_io_read(struct pblk *pblk, struct nvm_rq *rqd,
> pblk_log_read_err(pblk, rqd);
>
> pblk_read_check_seq(pblk, rqd, r_ctx->lba);
> -
> - if (int_bio)
> - bio_put(int_bio);
> + bio_put(int_bio);
>
> if (put_line)
> pblk_rq_to_line_put(pblk, rqd);
> @@ -223,183 +222,13 @@ static void pblk_end_io_read(struct nvm_rq *rqd)
> __pblk_end_io_read(pblk, rqd, true);
> }
>
> -static void pblk_end_partial_read(struct nvm_rq *rqd)
> -{
> - struct pblk *pblk = rqd->private;
> - struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd);
> - struct pblk_pr_ctx *pr_ctx = r_ctx->private;
> - struct pblk_sec_meta *meta;
> - struct bio *new_bio = rqd->bio;
> - struct bio *bio = pr_ctx->orig_bio;
> - void *meta_list = rqd->meta_list;
> - unsigned long *read_bitmap = pr_ctx->bitmap;
> - struct bvec_iter orig_iter = BVEC_ITER_ALL_INIT;
> - struct bvec_iter new_iter = BVEC_ITER_ALL_INIT;
> - int nr_secs = pr_ctx->orig_nr_secs;
> - int nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs);
> - void *src_p, *dst_p;
> - int bit, i;
> -
> - if (unlikely(nr_holes == 1)) {
> - struct ppa_addr ppa;
> -
> - ppa = rqd->ppa_addr;
> - rqd->ppa_list = pr_ctx->ppa_ptr;
> - rqd->dma_ppa_list = pr_ctx->dma_ppa_list;
> - rqd->ppa_list[0] = ppa;
> - }
> -
> - for (i = 0; i < nr_secs; i++) {
> - meta = pblk_get_meta(pblk, meta_list, i);
> - pr_ctx->lba_list_media[i] = le64_to_cpu(meta->lba);
> - meta->lba = cpu_to_le64(pr_ctx->lba_list_mem[i]);
> - }
> -
> - /* Fill the holes in the original bio */
> - i = 0;
> - for (bit = 0; bit < nr_secs; bit++) {
> - if (!test_bit(bit, read_bitmap)) {
> - struct bio_vec dst_bv, src_bv;
> - struct pblk_line *line;
> -
> - line = pblk_ppa_to_line(pblk, rqd->ppa_list[i]);
> - kref_put(&line->ref, pblk_line_put);
> -
> - meta = pblk_get_meta(pblk, meta_list, bit);
> - meta->lba = cpu_to_le64(pr_ctx->lba_list_media[i]);
> -
> - dst_bv = bio_iter_iovec(bio, orig_iter);
> - src_bv = bio_iter_iovec(new_bio, new_iter);
> -
> - src_p = kmap_atomic(src_bv.bv_page);
> - dst_p = kmap_atomic(dst_bv.bv_page);
> -
> - memcpy(dst_p + dst_bv.bv_offset,
> - src_p + src_bv.bv_offset,
> - PBLK_EXPOSED_PAGE_SIZE);
> -
> - kunmap_atomic(src_p);
> - kunmap_atomic(dst_p);
> -
> - flush_dcache_page(dst_bv.bv_page);
> - mempool_free(src_bv.bv_page, &pblk->page_bio_pool);
> -
> - bio_advance_iter(new_bio, &new_iter,
> - PBLK_EXPOSED_PAGE_SIZE);
> - i++;
> - }
> - bio_advance_iter(bio, &orig_iter, PBLK_EXPOSED_PAGE_SIZE);
> - }
> -
> - bio_put(new_bio);
> - kfree(pr_ctx);
> -
> - /* restore original request */
> - rqd->bio = NULL;
> - rqd->nr_ppas = nr_secs;
> -
> - pblk_end_user_read(bio, rqd->error);
> - __pblk_end_io_read(pblk, rqd, false);
> -}
> -
> -static int pblk_setup_partial_read(struct pblk *pblk, struct nvm_rq *rqd,
> - unsigned int bio_init_idx,
> - unsigned long *read_bitmap,
> - int nr_holes)
> -{
> - void *meta_list = rqd->meta_list;
> - struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd);
> - struct pblk_pr_ctx *pr_ctx;
> - struct bio *new_bio, *bio = r_ctx->private;
> - int nr_secs = rqd->nr_ppas;
> - int i;
> -
> - new_bio = bio_alloc(GFP_KERNEL, nr_holes);
> -
> - if (pblk_bio_add_pages(pblk, new_bio, GFP_KERNEL, nr_holes))
> - goto fail_bio_put;
> -
> - if (nr_holes != new_bio->bi_vcnt) {
> - WARN_ONCE(1, "pblk: malformed bio\n");
> - goto fail_free_pages;
> - }
> -
> - pr_ctx = kzalloc(sizeof(struct pblk_pr_ctx), GFP_KERNEL);
> - if (!pr_ctx)
> - goto fail_free_pages;
> -
> - for (i = 0; i < nr_secs; i++) {
> - struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i);
> -
> - pr_ctx->lba_list_mem[i] = le64_to_cpu(meta->lba);
> - }
> -
> - new_bio->bi_iter.bi_sector = 0; /* internal bio */
> - bio_set_op_attrs(new_bio, REQ_OP_READ, 0);
> -
> - rqd->bio = new_bio;
> - rqd->nr_ppas = nr_holes;
> -
> - pr_ctx->orig_bio = bio;
> - bitmap_copy(pr_ctx->bitmap, read_bitmap, NVM_MAX_VLBA);
> - pr_ctx->bio_init_idx = bio_init_idx;
> - pr_ctx->orig_nr_secs = nr_secs;
> - r_ctx->private = pr_ctx;
> -
> - if (unlikely(nr_holes == 1)) {
> - pr_ctx->ppa_ptr = rqd->ppa_list;
> - pr_ctx->dma_ppa_list = rqd->dma_ppa_list;
> - rqd->ppa_addr = rqd->ppa_list[0];
> - }
> - return 0;
> -
> -fail_free_pages:
> - pblk_bio_free_pages(pblk, new_bio, 0, new_bio->bi_vcnt);
> -fail_bio_put:
> - bio_put(new_bio);
> -
> - return -ENOMEM;
> -}
> -
> -static int pblk_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd,
> - unsigned int bio_init_idx,
> - unsigned long *read_bitmap, int nr_secs)
> -{
> - int nr_holes;
> - int ret;
> -
> - nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs);
> -
> - if (pblk_setup_partial_read(pblk, rqd, bio_init_idx, read_bitmap,
> - nr_holes))
> - return NVM_IO_ERR;
> -
> - rqd->end_io = pblk_end_partial_read;
> -
> - ret = pblk_submit_io(pblk, rqd);
> - if (ret) {
> - bio_put(rqd->bio);
> - pblk_err(pblk, "partial read IO submission failed\n");
> - goto err;
> - }
> -
> - return NVM_IO_OK;
> -
> -err:
> - pblk_err(pblk, "failed to perform partial read\n");
> -
> - /* Free allocated pages in new bio */
> - pblk_bio_free_pages(pblk, rqd->bio, 0, rqd->bio->bi_vcnt);
> - return NVM_IO_ERR;
> -}
> -
> static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd, struct bio *bio,
> - sector_t lba, unsigned long *read_bitmap)
> + sector_t lba, bool *from_cache)
> {
> struct pblk_sec_meta *meta = pblk_get_meta(pblk, rqd->meta_list, 0);
> struct ppa_addr ppa;
>
> - pblk_lookup_l2p_seq(pblk, &ppa, lba, 1);
> + pblk_lookup_l2p_seq(pblk, &ppa, lba, 1, from_cache);
>
> #ifdef CONFIG_NVM_PBLK_DEBUG
> atomic_long_inc(&pblk->inflight_reads);
> @@ -409,7 +238,6 @@ static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd, struct bio *bio,
> if (pblk_ppa_empty(ppa)) {
> __le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
>
> - WARN_ON(test_and_set_bit(0, read_bitmap));
> meta->lba = addr_empty;
> return;
> }
> @@ -418,12 +246,11 @@ static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd, struct bio *bio,
> * write buffer to prevent retrieving overwritten data.
> */
> if (pblk_addr_in_cache(ppa)) {
> - if (!pblk_read_from_cache(pblk, bio, lba, ppa, 0, 1)) {
> - pblk_lookup_l2p_seq(pblk, &ppa, lba, 1);
> + if (!pblk_read_from_cache(pblk, bio, lba, ppa)) {
> + pblk_lookup_l2p_seq(pblk, &ppa, lba, 1, from_cache);
> goto retry;
> }
>
> - WARN_ON(test_and_set_bit(0, read_bitmap));
> meta->lba = cpu_to_le64(lba);
>
> #ifdef CONFIG_NVM_PBLK_DEBUG
> @@ -440,17 +267,14 @@ void pblk_submit_read(struct pblk *pblk, struct bio *bio)
> struct request_queue *q = dev->q;
> sector_t blba = pblk_get_lba(bio);
> unsigned int nr_secs = pblk_get_secs(bio);
> + bool from_cache;
> struct pblk_g_ctx *r_ctx;
> struct nvm_rq *rqd;
> - struct bio *int_bio;
> - unsigned int bio_init_idx;
> - DECLARE_BITMAP(read_bitmap, NVM_MAX_VLBA);
> + struct bio *int_bio, *split_bio;
>
> generic_start_io_acct(q, REQ_OP_READ, bio_sectors(bio),
> &pblk->disk->part0);
>
> - bitmap_zero(read_bitmap, nr_secs);
> -
> rqd = pblk_alloc_rqd(pblk, PBLK_READ);
>
> rqd->opcode = NVM_OP_PREAD;
> @@ -462,11 +286,6 @@ void pblk_submit_read(struct pblk *pblk, struct bio *bio)
> r_ctx->start_time = jiffies;
> r_ctx->lba = blba;
>
> - /* Save the index for this bio's start. This is needed in case
> - * we need to fill a partial read.
> - */
> - bio_init_idx = pblk_get_bi_idx(bio);
> -
> if (pblk_alloc_rqd_meta(pblk, rqd)) {
> bio_io_error(bio);
> pblk_free_rqd(pblk, rqd, PBLK_READ);
> @@ -475,46 +294,58 @@ void pblk_submit_read(struct pblk *pblk, struct bio *bio)
>
> /* Clone read bio to deal internally with:
> * -read errors when reading from drive
> - * -bio_advance() calls during l2p lookup and cache reads
> + * -bio_advance() calls during cache reads
> */
> int_bio = bio_clone_fast(bio, GFP_KERNEL, &pblk_bio_set);
>
> if (nr_secs > 1)
> - pblk_read_ppalist_rq(pblk, rqd, bio, blba, read_bitmap);
> + nr_secs = pblk_read_ppalist_rq(pblk, rqd, int_bio, blba,
> + &from_cache);
> else
> - pblk_read_rq(pblk, rqd, bio, blba, read_bitmap);
> + pblk_read_rq(pblk, rqd, int_bio, blba, &from_cache);
>
> +split_retry:
> r_ctx->private = bio; /* original bio */
> rqd->bio = int_bio; /* internal bio */
>
> - if (bitmap_full(read_bitmap, nr_secs)) {
> + if (from_cache && nr_secs == rqd->nr_ppas) {
> + /* All data was read from cache, we can complete the IO. */
> pblk_end_user_read(bio, 0);
> atomic_inc(&pblk->inflight_io);
> __pblk_end_io_read(pblk, rqd, false);
> - return;
> - }
> -
> - if (!bitmap_empty(read_bitmap, rqd->nr_ppas)) {
> + } else if (nr_secs != rqd->nr_ppas) {
> /* The read bio request could be partially filled by the write
> * buffer, but there are some holes that need to be read from
> - * the drive.
> + * the drive. In order to handle this, we will use block layer
> + * mechanism to split this request in to smaller ones and make
> + * a chain of it.
> */
> - bio_put(int_bio);
> - rqd->bio = NULL;
> - if (pblk_partial_read_bio(pblk, rqd, bio_init_idx, read_bitmap,
> - nr_secs)) {
> - pblk_err(pblk, "read IO submission failed\n");
> - bio_io_error(bio);
> - __pblk_end_io_read(pblk, rqd, false);
> - }
> - return;
> - }
> + split_bio = bio_split(bio, nr_secs * NR_PHY_IN_LOG, GFP_KERNEL,
> + &pblk_bio_set);
> + bio_chain(split_bio, bio);
> + generic_make_request(bio);
> +
> + /* New bio contains first N sectors of the previous one, so
> + * we can continue to use existing rqd, but we need to shrink
> + * the number of PPAs in it. New bio is also guaranteed that
> + * it contains only either data from cache or from drive, newer
> + * mix of them.
> + */
> + bio = split_bio;
> + rqd->nr_ppas = nr_secs;
> + if (rqd->nr_ppas == 1)
> + rqd->ppa_addr = rqd->ppa_list[0];
>
> - /* All sectors are to be read from the device */
> - if (pblk_submit_io(pblk, rqd)) {
> - pblk_err(pblk, "read IO submission failed\n");
> - bio_io_error(bio);
> - __pblk_end_io_read(pblk, rqd, false);
> + /* Recreate int_bio - existing might have some needed internal
> + * fields modified already.
> + */
> + bio_put(int_bio);
> + int_bio = bio_clone_fast(bio, GFP_KERNEL, &pblk_bio_set);
> + goto split_retry;
> + } else if (pblk_submit_io(pblk, rqd)) {
> + /* Submitting IO to drive failed, let's report an error */
> + rqd->error = -ENODEV;
> + pblk_end_io_read(rqd);
> }
> }
>
> diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
> index 17ced12..a678553 100644
> --- a/drivers/lightnvm/pblk.h
> +++ b/drivers/lightnvm/pblk.h
> @@ -121,18 +121,6 @@ struct pblk_g_ctx {
> u64 lba;
> };
>
> -/* partial read context */
> -struct pblk_pr_ctx {
> - struct bio *orig_bio;
> - DECLARE_BITMAP(bitmap, NVM_MAX_VLBA);
> - unsigned int orig_nr_secs;
> - unsigned int bio_init_idx;
> - void *ppa_ptr;
> - dma_addr_t dma_ppa_list;
> - u64 lba_list_mem[NVM_MAX_VLBA];
> - u64 lba_list_media[NVM_MAX_VLBA];
> -};
> -
> /* Pad context */
> struct pblk_pad_rq {
> struct pblk *pblk;
> @@ -759,7 +747,7 @@ unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct nvm_rq *rqd,
> unsigned int pos, unsigned int nr_entries,
> unsigned int count);
> int pblk_rb_copy_to_bio(struct pblk_rb *rb, struct bio *bio, sector_t lba,
> - struct ppa_addr ppa, int bio_iter, bool advanced_bio);
> + struct ppa_addr ppa);
> unsigned int pblk_rb_read_commit(struct pblk_rb *rb, unsigned int entries);
>
> unsigned int pblk_rb_sync_init(struct pblk_rb *rb, unsigned long *flags);
> @@ -859,8 +847,8 @@ int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa,
> struct pblk_line *gc_line, u64 paddr);
> void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas,
> u64 *lba_list, int nr_secs);
> -void pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas,
> - sector_t blba, int nr_secs);
> +int pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas,
> + sector_t blba, int nr_secs, bool *from_cache);
> void *pblk_get_meta_for_writes(struct pblk *pblk, struct nvm_rq *rqd);
> void pblk_get_packed_meta(struct pblk *pblk, struct nvm_rq *rqd);
>
> --
> 2.9.5
It looks good to me. Thanks for this Igor!
Reviewed-by: Javier González <javier@xxxxxxxxxxx>
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