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lightnvm: pblk: clear flush point on completed writes 

Move completion of syncs and clearing of flush points to the
write completion path - this ensures that the data has been
comitted to the media before completing bios containing syncs.

Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com>
Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Hans Holmberg 2018-01-05 14:16:10 +01:00 committed by Jens Axboe
parent 8154d296d9
commit 533657c190
2 changed files with 44 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
drivers/lightnvm/pblk-rb.c
View File

@ -353,17 +353,17 @@ static int pblk_rb_flush_point_set(struct pblk_rb *rb, struct bio *bio,
unsigned int pos)
{
struct pblk_rb_entry *entry;
unsigned int subm, flush_point;
unsigned int sync, flush_point;
subm = READ_ONCE(rb->subm);
sync = READ_ONCE(rb->sync);
if (pos == sync)
return 0;
#ifdef CONFIG_NVM_DEBUG
atomic_inc(&rb->inflight_flush_point);
#endif
if (pos == subm)
return 0;
flush_point = (pos == 0) ? (rb->nr_entries - 1) : (pos - 1);
entry = &rb->entries[flush_point];
@ -606,22 +606,6 @@ try:
return NVM_IO_ERR;
}
if (flags & PBLK_FLUSH_ENTRY) {
unsigned int flush_point;
flush_point = READ_ONCE(rb->flush_point);
if (flush_point == pos) {
/* Protect flush points */
smp_store_release(&rb->flush_point,
EMPTY_ENTRY);
}
flags &= ~PBLK_FLUSH_ENTRY;
#ifdef CONFIG_NVM_DEBUG
atomic_dec(&rb->inflight_flush_point);
#endif
}
flags &= ~PBLK_WRITTEN_DATA;
flags |= PBLK_SUBMITTED_ENTRY;
@ -731,15 +715,24 @@ void pblk_rb_sync_end(struct pblk_rb *rb, unsigned long *flags)
unsigned int pblk_rb_sync_advance(struct pblk_rb *rb, unsigned int nr_entries)
{
unsigned int sync;
unsigned int i;
unsigned int sync, flush_point;
lockdep_assert_held(&rb->s_lock);
sync = READ_ONCE(rb->sync);
flush_point = READ_ONCE(rb->flush_point);
for (i = 0; i < nr_entries; i++)
sync = (sync + 1) & (rb->nr_entries - 1);
if (flush_point != EMPTY_ENTRY) {
unsigned int secs_to_flush;
secs_to_flush = pblk_rb_ring_count(flush_point, sync,
rb->nr_entries);
if (secs_to_flush < nr_entries) {
/* Protect flush points */
smp_store_release(&rb->flush_point, EMPTY_ENTRY);
}
}
sync = (sync + nr_entries) & (rb->nr_entries - 1);
/* Protect from counts */
smp_store_release(&rb->sync, sync);
@ -747,22 +740,27 @@ unsigned int pblk_rb_sync_advance(struct pblk_rb *rb, unsigned int nr_entries)
return sync;
}
/* Calculate how many sectors to submit up to the current flush point. */
unsigned int pblk_rb_flush_point_count(struct pblk_rb *rb)
{
unsigned int subm, flush_point;
unsigned int count;
unsigned int subm, sync, flush_point;
unsigned int submitted, to_flush;
/* Protect flush points */
flush_point = smp_load_acquire(&rb->flush_point);
if (flush_point == EMPTY_ENTRY)
return 0;
/* Protect syncs */
sync = smp_load_acquire(&rb->sync);
subm = READ_ONCE(rb->subm);
submitted = pblk_rb_ring_count(subm, sync, rb->nr_entries);
/* The sync point itself counts as a sector to sync */
count = pblk_rb_ring_count(flush_point, subm, rb->nr_entries) + 1;
to_flush = pblk_rb_ring_count(flush_point, sync, rb->nr_entries) + 1;
return count;
return (submitted < to_flush) ? (to_flush - submitted) : 0;
}
/*

17
drivers/lightnvm/pblk-write.c
View File

@ -21,13 +21,28 @@ static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd,
struct pblk_c_ctx *c_ctx)
{
struct bio *original_bio;
struct pblk_rb *rwb = &pblk->rwb;
unsigned long ret;
int i;
for (i = 0; i < c_ctx->nr_valid; i++) {
struct pblk_w_ctx *w_ctx;
int pos = c_ctx->sentry + i;
int flags;
w_ctx = pblk_rb_w_ctx(rwb, pos);
flags = READ_ONCE(w_ctx->flags);
if (flags & PBLK_FLUSH_ENTRY) {
flags &= ~PBLK_FLUSH_ENTRY;
/* Release flags on context. Protect from writes */
smp_store_release(&w_ctx->flags, flags);
#ifdef CONFIG_NVM_DEBUG
atomic_dec(&rwb->inflight_flush_point);
#endif
}
w_ctx = pblk_rb_w_ctx(&pblk->rwb, c_ctx->sentry + i);
while ((original_bio = bio_list_pop(&w_ctx->bios)))
bio_endio(original_bio);
}