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lightnvm: refactor end_io functions for sync

Browse source 
To implement sync I/O support within the LightNVM core, the end_io
functions are refactored to take an end_io function pointer instead of
testing for initialized media manager, followed by calling its end_io
function.

Sync I/O can then be implemented using a callback that signal I/O
completion. This is similar to the logic found in blk_to_execute_io().
By implementing it this way, the underlying device I/Os submission logic
is abstracted away from core, targets, and media managers.

Signed-off-by: Matias Bjørling <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Matias Bjørling 2016-01-12 07:49:21 +01:00 • committed by Jens Axboe
commit 91276162de
6 changed files with 42 additions and 34 deletions
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16
drivers/lightnvm/core.c
View file

@ -27,6 +27,7 @@
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/lightnvm.h>
#include <linux/sched/sysctl.h>
#include <uapi/linux/lightnvm.h>
static LIST_HEAD(nvm_targets);
@ -288,6 +289,21 @@ int nvm_erase_ppa(struct nvm_dev *dev, struct ppa_addr ppa)
}
EXPORT_SYMBOL(nvm_erase_ppa);
void nvm_end_io(struct nvm_rq *rqd, int error)
{
rqd->end_io(rqd, error);
}
EXPORT_SYMBOL(nvm_end_io);
static void nvm_end_io_sync(struct nvm_rq *rqd, int errors)
{
struct completion *waiting = rqd->wait;
rqd->wait = NULL;
complete(waiting);
}
static int nvm_core_init(struct nvm_dev *dev)
{
struct nvm_id *id = &dev->identity;

34
drivers/lightnvm/gennvm.c
View file

@ -317,18 +317,6 @@ static void gennvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
spin_unlock(&vlun->lock);
}
static int gennvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
{
if (!dev->ops->submit_io)
return -ENODEV;
/* Convert address space */
nvm_generic_to_addr_mode(dev, rqd);
rqd->dev = dev;
return dev->ops->submit_io(dev, rqd);
}
static void gennvm_blk_set_type(struct nvm_dev *dev, struct ppa_addr *ppa,
int type)
{
@ -375,25 +363,32 @@ static void gennvm_mark_blk_bad(struct nvm_dev *dev, struct nvm_rq *rqd)
gennvm_blk_set_type(dev, &rqd->ppa_addr, 2);
}
static int gennvm_end_io(struct nvm_rq *rqd, int error)
static void gennvm_end_io(struct nvm_rq *rqd, int error)
{
struct nvm_tgt_instance *ins = rqd->ins;
int ret = 0;
switch (error) {
case NVM_RSP_SUCCESS:
break;
case NVM_RSP_ERR_EMPTYPAGE:
break;
case NVM_RSP_ERR_FAILWRITE:
gennvm_mark_blk_bad(rqd->dev, rqd);
default:
ret++;
}
ret += ins->tt->end_io(rqd, error);
ins->tt->end_io(rqd, error);
}
return ret;
static int gennvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
{
if (!dev->ops->submit_io)
return -ENODEV;
/* Convert address space */
nvm_generic_to_addr_mode(dev, rqd);
rqd->dev = dev;
rqd->end_io = gennvm_end_io;
return dev->ops->submit_io(dev, rqd);
}
static int gennvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk,
@ -442,7 +437,6 @@ static struct nvmm_type gennvm = {
.put_blk = gennvm_put_blk,
.submit_io = gennvm_submit_io,
.end_io = gennvm_end_io,
.erase_blk = gennvm_erase_blk,
.get_lun = gennvm_get_lun,

6
drivers/lightnvm/rrpc.c
View file

@ -642,7 +642,7 @@ static void rrpc_end_io_write(struct rrpc *rrpc, struct rrpc_rq *rrqd,
}
}
static int rrpc_end_io(struct nvm_rq *rqd, int error)
static void rrpc_end_io(struct nvm_rq *rqd, int error)
{
struct rrpc *rrpc = container_of(rqd->ins, struct rrpc, instance);
struct rrpc_rq *rrqd = nvm_rq_to_pdu(rqd);
@ -655,7 +655,7 @@ static int rrpc_end_io(struct nvm_rq *rqd, int error)
bio_put(rqd->bio);
if (rrqd->flags & NVM_IOTYPE_GC)
return 0;
return;
rrpc_unlock_rq(rrpc, rqd);
@ -665,8 +665,6 @@ static int rrpc_end_io(struct nvm_rq *rqd, int error)
nvm_dev_dma_free(rrpc->dev, rqd->metadata, rqd->dma_metadata);
mempool_free(rqd, rrpc->rq_pool);
return 0;
}
static int rrpc_read_ppalist_rq(struct rrpc *rrpc, struct bio *bio,