#include "blk.h"
#include "blk-mq.h"
+#include "blk-mq-sched.h"
#include "blk-wbt.h"
EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_remap);
rq->__sector = (sector_t) -1;
INIT_HLIST_NODE(&rq->hash);
RB_CLEAR_NODE(&rq->rb_node);
- rq->cmd = rq->__cmd;
- rq->cmd_len = BLK_MAX_CDB;
rq->tag = -1;
+ rq->internal_tag = -1;
rq->start_time = jiffies;
set_start_time_ns(rq);
rq->part = NULL;
void blk_dump_rq_flags(struct request *rq, char *msg)
{
- int bit;
-
printk(KERN_INFO "%s: dev %s: type=%x, flags=%llx\n", msg,
rq->rq_disk ? rq->rq_disk->disk_name : "?", rq->cmd_type,
(unsigned long long) rq->cmd_flags);
blk_rq_sectors(rq), blk_rq_cur_sectors(rq));
printk(KERN_INFO " bio %p, biotail %p, len %u\n",
rq->bio, rq->biotail, blk_rq_bytes(rq));
-
- if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
- printk(KERN_INFO " cdb: ");
- for (bit = 0; bit < BLK_MAX_CDB; bit++)
- printk("%02x ", rq->cmd[bit]);
- printk("\n");
- }
}
EXPORT_SYMBOL(blk_dump_rq_flags);
EXPORT_SYMBOL(blk_cleanup_queue);
/* Allocate memory local to the request queue */
-static void *alloc_request_struct(gfp_t gfp_mask, void *data)
+static void *alloc_request_simple(gfp_t gfp_mask, void *data)
{
- int nid = (int)(long)data;
- return kmem_cache_alloc_node(request_cachep, gfp_mask, nid);
+ struct request_queue *q = data;
+
+ return kmem_cache_alloc_node(request_cachep, gfp_mask, q->node);
}
-static void free_request_struct(void *element, void *unused)
+static void free_request_simple(void *element, void *data)
{
kmem_cache_free(request_cachep, element);
}
+static void *alloc_request_size(gfp_t gfp_mask, void *data)
+{
+ struct request_queue *q = data;
+ struct request *rq;
+
+ rq = kmalloc_node(sizeof(struct request) + q->cmd_size, gfp_mask,
+ q->node);
+ if (rq && q->init_rq_fn && q->init_rq_fn(q, rq, gfp_mask) < 0) {
+ kfree(rq);
+ rq = NULL;
+ }
+ return rq;
+}
+
+static void free_request_size(void *element, void *data)
+{
+ struct request_queue *q = data;
+
+ if (q->exit_rq_fn)
+ q->exit_rq_fn(q, element);
+ kfree(element);
+}
+
int blk_init_rl(struct request_list *rl, struct request_queue *q,
gfp_t gfp_mask)
{
init_waitqueue_head(&rl->wait[BLK_RW_SYNC]);
init_waitqueue_head(&rl->wait[BLK_RW_ASYNC]);
- rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ, alloc_request_struct,
- free_request_struct,
- (void *)(long)q->node, gfp_mask,
- q->node);
+ if (q->cmd_size) {
+ rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ,
+ alloc_request_size, free_request_size,
+ q, gfp_mask, q->node);
+ } else {
+ rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ,
+ alloc_request_simple, free_request_simple,
+ q, gfp_mask, q->node);
+ }
if (!rl->rq_pool)
return -ENOMEM;
struct request_queue *
blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id)
{
- struct request_queue *uninit_q, *q;
+ struct request_queue *q;
- uninit_q = blk_alloc_queue_node(GFP_KERNEL, node_id);
- if (!uninit_q)
+ q = blk_alloc_queue_node(GFP_KERNEL, node_id);
+ if (!q)
return NULL;
- q = blk_init_allocated_queue(uninit_q, rfn, lock);
- if (!q)
- blk_cleanup_queue(uninit_q);
+ q->request_fn = rfn;
+ if (lock)
+ q->queue_lock = lock;
+ if (blk_init_allocated_queue(q) < 0) {
+ blk_cleanup_queue(q);
+ return NULL;
+ }
return q;
}
static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio);
-struct request_queue *
-blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn,
- spinlock_t *lock)
-{
- if (!q)
- return NULL;
- q->fq = blk_alloc_flush_queue(q, NUMA_NO_NODE, 0);
+int blk_init_allocated_queue(struct request_queue *q)
+{
+ q->fq = blk_alloc_flush_queue(q, NUMA_NO_NODE, q->cmd_size);
if (!q->fq)
- return NULL;
+ return -ENOMEM;
+
+ if (q->init_rq_fn && q->init_rq_fn(q, q->fq->flush_rq, GFP_KERNEL))
+ goto out_free_flush_queue;
if (blk_init_rl(&q->root_rl, q, GFP_KERNEL))
- goto fail;
+ goto out_exit_flush_rq;
INIT_WORK(&q->timeout_work, blk_timeout_work);
- q->request_fn = rfn;
- q->prep_rq_fn = NULL;
- q->unprep_rq_fn = NULL;
q->queue_flags |= QUEUE_FLAG_DEFAULT;
- /* Override internal queue lock with supplied lock pointer */
- if (lock)
- q->queue_lock = lock;
-
/*
* This also sets hw/phys segments, boundary and size
*/
/* init elevator */
if (elevator_init(q, NULL)) {
mutex_unlock(&q->sysfs_lock);
- goto fail;
+ goto out_exit_flush_rq;
}
mutex_unlock(&q->sysfs_lock);
+ return 0;
- return q;
-
-fail:
+out_exit_flush_rq:
+ if (q->exit_rq_fn)
+ q->exit_rq_fn(q, q->fq->flush_rq);
+out_free_flush_queue:
blk_free_flush_queue(q->fq);
wbt_exit(q);
- return NULL;
+ return -ENOMEM;
}
EXPORT_SYMBOL(blk_init_allocated_queue);
return 0;
}
-/*
- * Determine if elevator data should be initialized when allocating the
- * request associated with @bio.
- */
-static bool blk_rq_should_init_elevator(struct bio *bio)
-{
- if (!bio)
- return true;
-
- /*
- * Flush requests do not use the elevator so skip initialization.
- * This allows a request to share the flush and elevator data.
- */
- if (bio->bi_opf & (REQ_PREFLUSH | REQ_FUA))
- return false;
-
- return true;
-}
-
-/**
- * rq_ioc - determine io_context for request allocation
- * @bio: request being allocated is for this bio (can be %NULL)
- *
- * Determine io_context to use for request allocation for @bio. May return
- * %NULL if %current->io_context doesn't exist.
- */
-static struct io_context *rq_ioc(struct bio *bio)
-{
-#ifdef CONFIG_BLK_CGROUP
- if (bio && bio->bi_ioc)
- return bio->bi_ioc;
-#endif
- return current->io_context;
-}
-
/**
* __get_request - get a free request
* @rl: request list to allocate from
* request is freed. This guarantees icq's won't be destroyed and
* makes creating new ones safe.
*
+ * Flush requests do not use the elevator so skip initialization.
+ * This allows a request to share the flush and elevator data.
+ *
* Also, lookup icq while holding queue_lock. If it doesn't exist,
* it will be created after releasing queue_lock.
*/
- if (blk_rq_should_init_elevator(bio) && !blk_queue_bypass(q)) {
+ if (!op_is_flush(op) && !blk_queue_bypass(q)) {
rq_flags |= RQF_ELVPRIV;
q->nr_rqs_elvpriv++;
if (et->icq_cache && ioc)
{
struct request *rq;
- BUG_ON(rw != READ && rw != WRITE);
-
/* create ioc upfront */
create_io_context(gfp_mask, q->node);
}
EXPORT_SYMBOL(blk_get_request);
-/**
- * blk_rq_set_block_pc - initialize a request to type BLOCK_PC
- * @rq: request to be initialized
- *
- */
-void blk_rq_set_block_pc(struct request *rq)
-{
- rq->cmd_type = REQ_TYPE_BLOCK_PC;
- memset(rq->__cmd, 0, sizeof(rq->__cmd));
-}
-EXPORT_SYMBOL(blk_rq_set_block_pc);
-
/**
* blk_requeue_request - put a request back on queue
* @q: request queue where request should be inserted
return BLK_QC_T_NONE;
}
- if (bio->bi_opf & (REQ_PREFLUSH | REQ_FUA)) {
+ if (op_is_flush(bio->bi_opf)) {
spin_lock_irq(q->queue_lock);
where = ELEVATOR_INSERT_FLUSH;
goto get_rq;
* drivers without flush support don't have to worry
* about them.
*/
- if ((bio->bi_opf & (REQ_PREFLUSH | REQ_FUA)) &&
+ if (op_is_flush(bio->bi_opf) &&
!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) {
bio->bi_opf &= ~(REQ_PREFLUSH | REQ_FUA);
if (!nr_sectors) {
if (q->mq_ops) {
if (blk_queue_io_stat(q))
blk_account_io_start(rq, true);
- blk_mq_insert_request(rq, false, true, false);
+ blk_mq_sched_insert_request(rq, false, true, false, false);
return 0;
}
*/
BUG_ON(blk_queued_rq(rq));
- if (rq->cmd_flags & (REQ_PREFLUSH | REQ_FUA))
+ if (op_is_flush(rq->cmd_flags))
where = ELEVATOR_INSERT_FLUSH;
add_acct_request(q, rq, where);
wbt_issue(req->q->rq_wb, &req->issue_stat);
}
- /*
- * We are now handing the request to the hardware, initialize
- * resid_len to full count and add the timeout handler.
- */
- req->resid_len = blk_rq_bytes(req);
- if (unlikely(blk_bidi_rq(req)))
- req->next_rq->resid_len = blk_rq_bytes(req->next_rq);
-
BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags));
blk_add_timer(req);
}
/*
* rq is already accounted, so use raw insert
*/
- if (rq->cmd_flags & (REQ_PREFLUSH | REQ_FUA))
+ if (op_is_flush(rq->cmd_flags))
__elv_add_request(q, rq, ELEVATOR_INSERT_FLUSH);
else
__elv_add_request(q, rq, ELEVATOR_INSERT_SORT_MERGE);
projects / linux-block.git / blobdiff