115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/*
|
|
* Copyright (C) 2016 CNEX Labs
|
|
* Initial release: Javier Gonzalez <javier@cnexlabs.com>
|
|
* Matias Bjorling <matias@cnexlabs.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version
|
|
* 2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* pblk-cache.c - pblk's write cache
|
|
*/
|
|
|
|
#include "pblk.h"
|
|
|
|
int pblk_write_to_cache(struct pblk *pblk, struct bio *bio, unsigned long flags)
|
|
{
|
|
struct pblk_w_ctx w_ctx;
|
|
sector_t lba = pblk_get_lba(bio);
|
|
unsigned int bpos, pos;
|
|
int nr_entries = pblk_get_secs(bio);
|
|
int i, ret;
|
|
|
|
/* Update the write buffer head (mem) with the entries that we can
|
|
* write. The write in itself cannot fail, so there is no need to
|
|
* rollback from here on.
|
|
*/
|
|
retry:
|
|
ret = pblk_rb_may_write_user(&pblk->rwb, bio, nr_entries, &bpos);
|
|
if (ret == NVM_IO_REQUEUE) {
|
|
io_schedule();
|
|
goto retry;
|
|
}
|
|
|
|
if (unlikely(!bio_has_data(bio)))
|
|
goto out;
|
|
|
|
w_ctx.flags = flags;
|
|
pblk_ppa_set_empty(&w_ctx.ppa);
|
|
|
|
for (i = 0; i < nr_entries; i++) {
|
|
void *data = bio_data(bio);
|
|
|
|
w_ctx.lba = lba + i;
|
|
|
|
pos = pblk_rb_wrap_pos(&pblk->rwb, bpos + i);
|
|
pblk_rb_write_entry_user(&pblk->rwb, data, w_ctx, pos);
|
|
|
|
bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE);
|
|
}
|
|
|
|
#ifdef CONFIG_NVM_DEBUG
|
|
atomic_long_add(nr_entries, &pblk->inflight_writes);
|
|
atomic_long_add(nr_entries, &pblk->req_writes);
|
|
#endif
|
|
|
|
out:
|
|
pblk_write_should_kick(pblk);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* On GC the incoming lbas are not necessarily sequential. Also, some of the
|
|
* lbas might not be valid entries, which are marked as empty by the GC thread
|
|
*/
|
|
int pblk_write_gc_to_cache(struct pblk *pblk, void *data, u64 *lba_list,
|
|
unsigned int nr_entries, unsigned int nr_rec_entries,
|
|
struct pblk_line *gc_line, unsigned long flags)
|
|
{
|
|
struct pblk_w_ctx w_ctx;
|
|
unsigned int bpos, pos;
|
|
int i, valid_entries;
|
|
|
|
/* Update the write buffer head (mem) with the entries that we can
|
|
* write. The write in itself cannot fail, so there is no need to
|
|
* rollback from here on.
|
|
*/
|
|
retry:
|
|
if (!pblk_rb_may_write_gc(&pblk->rwb, nr_rec_entries, &bpos)) {
|
|
io_schedule();
|
|
goto retry;
|
|
}
|
|
|
|
w_ctx.flags = flags;
|
|
pblk_ppa_set_empty(&w_ctx.ppa);
|
|
|
|
for (i = 0, valid_entries = 0; i < nr_entries; i++) {
|
|
if (lba_list[i] == ADDR_EMPTY)
|
|
continue;
|
|
|
|
w_ctx.lba = lba_list[i];
|
|
|
|
pos = pblk_rb_wrap_pos(&pblk->rwb, bpos + valid_entries);
|
|
pblk_rb_write_entry_gc(&pblk->rwb, data, w_ctx, gc_line, pos);
|
|
|
|
data += PBLK_EXPOSED_PAGE_SIZE;
|
|
valid_entries++;
|
|
}
|
|
|
|
WARN_ONCE(nr_rec_entries != valid_entries,
|
|
"pblk: inconsistent GC write\n");
|
|
|
|
#ifdef CONFIG_NVM_DEBUG
|
|
atomic_long_add(valid_entries, &pblk->inflight_writes);
|
|
atomic_long_add(valid_entries, &pblk->recov_gc_writes);
|
|
#endif
|
|
|
|
pblk_write_should_kick(pblk);
|
|
return NVM_IO_OK;
|
|
}
|