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lightnvm: introduce nvm_submit_ppa 

Internal logic for both core and media managers, does not have a
backing bio for issuing I/Os. Introduce nvm_submit_ppa to allow raw
I/Os to be submitted to the underlying device driver.

The function request the device, ppa, data buffer and its length and
will submit the I/O synchronously to the device. The return value may
therefore be used to detect any errors regarding the issued I/O.

Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Matias Bjørling 2016-01-12 07:49:30 +01:00 committed by Jens Axboe
parent 72d256ecc5
commit 09719b62fd
2 changed files with 46 additions and 1 deletions
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45
drivers/lightnvm/core.c
View File

@ -296,7 +296,7 @@ void nvm_end_io(struct nvm_rq *rqd, int error)
}
EXPORT_SYMBOL(nvm_end_io);
static void nvm_end_io_sync(struct nvm_rq *rqd, int errors)
static void nvm_end_io_sync(struct nvm_rq *rqd)
{
struct completion *waiting = rqd->wait;
@ -305,6 +305,49 @@ static void nvm_end_io_sync(struct nvm_rq *rqd, int errors)
complete(waiting);
}
int nvm_submit_ppa(struct nvm_dev *dev, struct ppa_addr *ppa, int nr_ppas,
int opcode, int flags, void *buf, int len)
{
DECLARE_COMPLETION_ONSTACK(wait);
struct nvm_rq rqd;
struct bio *bio;
int ret;
unsigned long hang_check;
bio = bio_map_kern(dev->q, buf, len, GFP_KERNEL);
if (IS_ERR_OR_NULL(bio))
return -ENOMEM;
memset(&rqd, 0, sizeof(struct nvm_rq));
ret = nvm_set_rqd_ppalist(dev, &rqd, ppa, nr_ppas);
if (ret) {
bio_put(bio);
return ret;
}
rqd.opcode = opcode;
rqd.bio = bio;
rqd.wait = &wait;
rqd.dev = dev;
rqd.end_io = nvm_end_io_sync;
rqd.flags = flags;
nvm_generic_to_addr_mode(dev, &rqd);
ret = dev->ops->submit_io(dev, &rqd);
/* Prevent hang_check timer from firing at us during very long I/O */
hang_check = sysctl_hung_task_timeout_secs;
if (hang_check)
while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2)));
else
wait_for_completion_io(&wait);
nvm_free_rqd_ppalist(dev, &rqd);
return rqd.error;
}
EXPORT_SYMBOL(nvm_submit_ppa);
static int nvm_core_init(struct nvm_dev *dev)
{
struct nvm_id *id = &dev->identity;

2
include/linux/lightnvm.h
View File

@ -440,6 +440,8 @@ extern void nvm_free_rqd_ppalist(struct nvm_dev *, struct nvm_rq *);
extern int nvm_erase_ppa(struct nvm_dev *, struct ppa_addr *, int);
extern int nvm_erase_blk(struct nvm_dev *, struct nvm_block *);
extern void nvm_end_io(struct nvm_rq *, int);
extern int nvm_submit_ppa(struct nvm_dev *, struct ppa_addr *, int, int, int,
void *, int);
#else /* CONFIG_NVM */
struct nvm_dev_ops;