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Merge branch 'for-linus' of git://git.kernel.dk/linux-block 

Pull block fixes from Jens Axboe:
 "Make the block layer great again.

  Basically three amazing fixes in this pull request, split into 4
  patches.  Believe me, they should go into 4.4.  Two of them fix a
  regression, the third and last fixes an easy-to-trigger bug.

   - Fix a bad irq enable through null_blk, for queue_mode=1 and using
     timer completions.  Add a block helper to restart a queue
     asynchronously, and use that from null_blk.  From me.

   - Fix a performance issue in NVMe.  Some devices (Intel Pxxxx) expose
     a stripe boundary, and performance suffers if we cross it.  We took
     that into account for merging, but not for the newer splitting
     code.  Fix from Keith.

   - Fix a kernel oops in lightnvm with multiple channels.  From Matias"

* 'for-linus' of git://git.kernel.dk/linux-block:
  lightnvm: wrong offset in bad blk lun calculation
  null_blk: use async queue restart helper
  block: add blk_start_queue_async()
  block: Split bios on chunk boundaries
This commit is contained in:
Linus Torvalds 2015-12-30 10:26:20 -08:00
parent 866be88a1a c3293a9ac2
commit c6169202e4
5 changed files with 24 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
block/blk-core.c
View File

@ -206,6 +206,22 @@ void blk_delay_queue(struct request_queue *q, unsigned long msecs)
}
EXPORT_SYMBOL(blk_delay_queue);
/**
* blk_start_queue_async - asynchronously restart a previously stopped queue
* @q: The &struct request_queue in question
*
* Description:
* blk_start_queue_async() will clear the stop flag on the queue, and
* ensure that the request_fn for the queue is run from an async
* context.
**/
void blk_start_queue_async(struct request_queue *q)
{
queue_flag_clear(QUEUE_FLAG_STOPPED, q);
blk_run_queue_async(q);
}
EXPORT_SYMBOL(blk_start_queue_async);
/**
* blk_start_queue - restart a previously stopped queue
* @q: The &struct request_queue in question

2
block/blk-merge.c
View File

@ -81,7 +81,7 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
struct bio *new = NULL;
bio_for_each_segment(bv, bio, iter) {
if (sectors + (bv.bv_len >> 9) > queue_max_sectors(q))
if (sectors + (bv.bv_len >> 9) > blk_max_size_offset(q, bio->bi_iter.bi_sector))
goto split;
/*

11
drivers/block/null_blk.c
View File

@ -232,20 +232,19 @@ static void end_cmd(struct nullb_cmd *cmd)
break;
case NULL_Q_BIO:
bio_endio(cmd->bio);
goto free_cmd;
break;
}
free_cmd(cmd);
/* Restart queue if needed, as we are freeing a tag */
if (q && !q->mq_ops && blk_queue_stopped(q)) {
if (queue_mode == NULL_Q_RQ && blk_queue_stopped(q)) {
unsigned long flags;
spin_lock_irqsave(q->queue_lock, flags);
if (blk_queue_stopped(q))
blk_start_queue(q);
blk_start_queue_async(q);
spin_unlock_irqrestore(q->queue_lock, flags);
}
free_cmd:
free_cmd(cmd);
}
static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer)

2
drivers/lightnvm/gennvm.c
View File

@ -75,7 +75,7 @@ static int gennvm_block_bb(struct ppa_addr ppa, int nr_blocks, u8 *blks,
struct nvm_block *blk;
int i;
lun = &gn->luns[(dev->nr_luns * ppa.g.ch) + ppa.g.lun];
lun = &gn->luns[(dev->luns_per_chnl * ppa.g.ch) + ppa.g.lun];
for (i = 0; i < nr_blocks; i++) {
if (blks[i] == 0)

1
include/linux/blkdev.h
View File

@ -797,6 +797,7 @@ extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
extern int blk_queue_enter(struct request_queue *q, gfp_t gfp);
extern void blk_queue_exit(struct request_queue *q);
extern void blk_start_queue(struct request_queue *q);
extern void blk_start_queue_async(struct request_queue *q);
extern void blk_stop_queue(struct request_queue *q);
extern void blk_sync_queue(struct request_queue *q);
extern void __blk_stop_queue(struct request_queue *q);