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lightnvm: pblk: support packed metadata

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pblk performs recovery of open lines by storing the LBA in the per LBA
metadata field. Recovery therefore only works for drives that has this
field.

This patch adds support for packed metadata, which store l2p mapping
for open lines in last sector of every write unit and enables drives
without per IO metadata to recover open lines.

After this patch, drives with OOB size <16B will use packed metadata
and metadata size larger than16B will continue to use the device per
IO metadata.

Reviewed-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Igor Konopko
2018-12-11 20:16:26 +01:00
committed by Jens Axboe
parent a16816b9e4
commit 55d8ec3539
9 changed files with 122 additions and 20 deletions
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9
drivers/lightnvm/pblk-write.c
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@@ -348,7 +348,7 @@ static int pblk_calc_secs_to_sync(struct pblk *pblk, unsigned int secs_avail,
{
int secs_to_sync;
secs_to_sync = pblk_calc_secs(pblk, secs_avail, secs_to_flush);
secs_to_sync = pblk_calc_secs(pblk, secs_avail, secs_to_flush, true);
#ifdef CONFIG_NVM_PBLK_DEBUG
if ((!secs_to_sync && secs_to_flush)
@@ -569,7 +569,7 @@ static int pblk_submit_write(struct pblk *pblk, int *secs_left)
struct bio *bio;
struct nvm_rq *rqd;
unsigned int secs_avail, secs_to_sync, secs_to_com;
unsigned int secs_to_flush;
unsigned int secs_to_flush, packed_meta_pgs;
unsigned long pos;
unsigned int resubmit;
@@ -607,7 +607,7 @@ static int pblk_submit_write(struct pblk *pblk, int *secs_left)
return 0;
secs_to_flush = pblk_rb_flush_point_count(&pblk->rwb);
if (!secs_to_flush && secs_avail < pblk->min_write_pgs)
if (!secs_to_flush && secs_avail < pblk->min_write_pgs_data)
return 0;
secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail,
@@ -622,7 +622,8 @@ static int pblk_submit_write(struct pblk *pblk, int *secs_left)
pos = pblk_rb_read_commit(&pblk->rwb, secs_to_com);
}
bio = bio_alloc(GFP_KERNEL, secs_to_sync);
packed_meta_pgs = (pblk->min_write_pgs - pblk->min_write_pgs_data);
bio = bio_alloc(GFP_KERNEL, secs_to_sync + packed_meta_pgs);
bio->bi_iter.bi_sector = 0; /* internal bio */
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);