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bdev/aio: Poller handles inline channel deletion

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Change the poller to tolerate channel deletion within
an I/O completion callback. This won't happen today
because channel deletion is always deferred, but
prepare for that case.

It turns out this is simpler anyway.

Change-Id: Ibff23d84fe14247849e95cebc3c80369812bdd6c
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/370525
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
This commit is contained in:
Ben Walker 2017-07-20 07:23:22 -07:00
parent f6e62d2ce1
commit 12b53038f6
2 changed files with 8 additions and 16 deletions
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22
lib/bdev/aio/bdev_aio.c
View File

@ -46,6 +46,8 @@
static int bdev_aio_initialize(void);
static void aio_free_disk(struct file_disk *fdisk);
#define SPDK_AIO_QUEUE_DEPTH 128
static int
bdev_aio_get_ctx_size(void)
{
@ -170,19 +172,11 @@ bdev_aio_destruct(void *ctx)
static int
bdev_aio_initialize_io_channel(struct bdev_aio_io_channel *ch)
{
ch->queue_depth = 128;
if (io_setup(ch->queue_depth, &ch->io_ctx) < 0) {
if (io_setup(SPDK_AIO_QUEUE_DEPTH, &ch->io_ctx) < 0) {
SPDK_ERRLOG("async I/O context setup failure\n");
return -1;
}
ch->events = calloc(sizeof(struct io_event), ch->queue_depth);
if (!ch->events) {
io_destroy(ch->io_ctx);
return -1;
}
return 0;
}
@ -194,12 +188,13 @@ bdev_aio_poll(void *arg)
enum spdk_bdev_io_status status;
struct bdev_aio_task *aio_task;
struct timespec timeout;
struct io_event events[SPDK_AIO_QUEUE_DEPTH];
timeout.tv_sec = 0;
timeout.tv_nsec = 0;
nr = io_getevents(ch->io_ctx, 1, ch->queue_depth,
ch->events, &timeout);
nr = io_getevents(ch->io_ctx, 1, SPDK_AIO_QUEUE_DEPTH,
events, &timeout);
if (nr < 0) {
SPDK_ERRLOG("%s: io_getevents returned %d\n", __func__, nr);
@ -207,8 +202,8 @@ bdev_aio_poll(void *arg)
}
for (i = 0; i < nr; i++) {
aio_task = ch->events[i].data;
if (ch->events[i].res != aio_task->len) {
aio_task = events[i].data;
if (events[i].res != aio_task->len) {
status = SPDK_BDEV_IO_STATUS_FAILED;
} else {
status = SPDK_BDEV_IO_STATUS_SUCCESS;
@ -309,7 +304,6 @@ bdev_aio_destroy_cb(void *io_device, void *ctx_buf)
struct bdev_aio_io_channel *io_channel = ctx_buf;
io_destroy(io_channel->io_ctx);
free(io_channel->events);
spdk_bdev_poller_stop(&io_channel->poller);
}

2
lib/bdev/aio/bdev_aio.h
View File

@ -51,8 +51,6 @@ struct bdev_aio_task {
struct bdev_aio_io_channel {
io_context_t io_ctx;
long queue_depth;
struct io_event *events;
struct spdk_bdev_poller *poller;
};