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NVMe: Handle failures differently in nvme_submit_bio_queue()

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Return -EBUSY if the queue is full or -ENOMEM if we failed to allocate
memory (or map a scatterlist).  Also use GFP_ATOMIC to allocate the
nvme_bio and move the locking to the callers of nvme_submit_bio_queue().

In nvme_make_request(), don't permit an I/O to jump the queue -- if the
congestion list already has an entry, just add to the tail, rather than
trying to submit.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
This commit is contained in:
Matthew Wilcox 2011-02-14 15:55:33 -05:00
parent 897cfe1ce7
commit eeee322647
1 changed files with 17 additions and 19 deletions
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36
drivers/block/nvme.c
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@ -420,17 +420,17 @@ static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
struct nvme_command *cmnd;
struct nvme_bio *nbio;
enum dma_data_direction dma_dir;
int cmdid;
int cmdid, result = -ENOMEM;
u16 control;
u32 dsmgmt;
unsigned long flags;
int psegs = bio_phys_segments(ns->queue, bio);
nbio = alloc_nbio(psegs, GFP_NOIO);
nbio = alloc_nbio(psegs, GFP_ATOMIC);
if (!nbio)
goto congestion;
goto nomem;
nbio->bio = bio;
result = -EBUSY;
cmdid = alloc_cmdid(nvmeq, nbio, bio_completion_id, IO_TIMEOUT);
if (unlikely(cmdid < 0))
goto free_nbio;
@ -445,7 +445,6 @@ static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
if (bio->bi_rw & REQ_RAHEAD)
dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
spin_lock_irqsave(&nvmeq->q_lock, flags);
cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
memset(cmnd, 0, sizeof(*cmnd));
@ -457,8 +456,9 @@ static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
dma_dir = DMA_FROM_DEVICE;
}
result = -ENOMEM;
if (nvme_map_bio(nvmeq->q_dmadev, nbio, bio, dma_dir, psegs) == 0)
goto mapping_failed;
goto free_nbio;
cmnd->rw.flags = 1;
cmnd->rw.command_id = cmdid;
@ -474,19 +474,12 @@ static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
if (++nvmeq->sq_tail == nvmeq->q_depth)
nvmeq->sq_tail = 0;
spin_unlock_irqrestore(&nvmeq->q_lock, flags);
return 0;
mapping_failed:
free_nbio(nvmeq, nbio);
bio_endio(bio, -ENOMEM);
return 0;
free_nbio:
free_nbio(nvmeq, nbio);
congestion:
return -EBUSY;
nomem:
return result;
}
static void nvme_resubmit_bio(struct nvme_queue *nvmeq, struct bio *bio)
@ -507,13 +500,18 @@ static int nvme_make_request(struct request_queue *q, struct bio *bio)
{
struct nvme_ns *ns = q->queuedata;
struct nvme_queue *nvmeq = get_nvmeq(ns);
int result = -EBUSY;
if (nvme_submit_bio_queue(nvmeq, ns, bio)) {
blk_set_queue_congested(q, rw_is_sync(bio->bi_rw));
spin_lock_irq(&nvmeq->q_lock);
spin_lock_irq(&nvmeq->q_lock);
if (bio_list_empty(&nvmeq->sq_cong))
result = nvme_submit_bio_queue(nvmeq, ns, bio);
if (unlikely(result)) {
if (bio_list_empty(&nvmeq->sq_cong))
add_wait_queue(&nvmeq->sq_full, &nvmeq->sq_cong_wait);
bio_list_add(&nvmeq->sq_cong, bio);
spin_unlock_irq(&nvmeq->q_lock);
}
spin_unlock_irq(&nvmeq->q_lock);
put_nvmeq(nvmeq);
return 0;