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bdev: remove spdk_bdev_resubmit_io

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We no longer support resubmitting an existing I/O to
a lower bdev.  This enables accurate tracking of I/O
at each bdev layer for purposes of reset handling and
QoS.

__submit_request() in bdev.c is now only called
from spdk_bdev_io_submit(), so just collapse these
two functions together while we are here.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I1b46df42b1a6476f9dbd8c61dd3380dbd145315d

Reviewed-on: https://review.gerrithub.io/377626
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
This commit is contained in:
Jim Harris 2017-09-07 14:42:50 -07:00
parent cd28ee8b7d
commit ff9cadadb3
2 changed files with 4 additions and 33 deletions
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4
include/spdk_internal/bdev.h
View File

@ -368,9 +368,6 @@ struct spdk_bdev_io {
/**
* Per I/O context for use by the bdev module.
*
* Note that vbdev modules may not use this field if modifying a bdev_io and resubmitting
* to the next lower bdev.
*/
uint8_t driver_ctx[0];
@ -400,7 +397,6 @@ void spdk_bdev_poller_stop(struct spdk_bdev_poller **ppoller);
void spdk_bdev_io_get_buf(struct spdk_bdev_io *bdev_io, spdk_bdev_io_get_buf_cb cb);
struct spdk_bdev_io *spdk_bdev_get_io(void);
void spdk_bdev_io_resubmit(struct spdk_bdev_io *bdev_io, struct spdk_bdev_desc *new_bdev_desc);
void spdk_bdev_io_complete(struct spdk_bdev_io *bdev_io,
enum spdk_bdev_io_status status);

33
lib/bdev/bdev.c
View File

@ -600,47 +600,22 @@ spdk_bdev_put_io(struct spdk_bdev_io *bdev_io)
spdk_mempool_put(g_bdev_mgr.bdev_io_pool, (void *)bdev_io);
}
static void
__submit_request(struct spdk_bdev *bdev, struct spdk_bdev_io *bdev_io)
static int
spdk_bdev_io_submit(struct spdk_bdev_io *bdev_io)
{
struct spdk_io_channel *ch;
struct spdk_bdev *bdev = bdev_io->bdev;
struct spdk_io_channel *ch = bdev_io->ch->channel;
assert(bdev_io->status == SPDK_BDEV_IO_STATUS_PENDING);
ch = bdev_io->ch->channel;
bdev_io->ch->io_outstanding++;
bdev_io->in_submit_request = true;
bdev->fn_table->submit_request(ch, bdev_io);
bdev_io->in_submit_request = false;
}
static int
spdk_bdev_io_submit(struct spdk_bdev_io *bdev_io)
{
struct spdk_bdev *bdev = bdev_io->bdev;
__submit_request(bdev, bdev_io);
return 0;
}
void
spdk_bdev_io_resubmit(struct spdk_bdev_io *bdev_io, struct spdk_bdev_desc *new_bdev_desc)
{
struct spdk_bdev *new_bdev = new_bdev_desc->bdev;
assert(bdev_io->status == SPDK_BDEV_IO_STATUS_PENDING);
bdev_io->bdev = new_bdev;
/*
* This bdev_io was already submitted so decrement io_outstanding to ensure it
* does not get double-counted.
*/
assert(bdev_io->ch->io_outstanding > 0);
bdev_io->ch->io_outstanding--;
__submit_request(new_bdev, bdev_io);
}
static void
spdk_bdev_io_init(struct spdk_bdev_io *bdev_io,
struct spdk_bdev *bdev, void *cb_arg,