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Merge tag 'md/4.12-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 

Pull MD bugfix from Shaohua Li:
 "One bug fix from Neil Brown for MD. The bug was introduced in this
  cycle"

* tag 'md/4.12-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md:
  md: initialise ->writes_pending in personality modules.
This commit is contained in:
Linus Torvalds 2017-06-09 22:24:23 -07:00
parent 42211f6cb6 a415c0f106
commit 2833b7e913
5 changed files with 21 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/md/md.c
View File

@ -5174,6 +5174,18 @@ static void mddev_delayed_delete(struct work_struct *ws)
static void no_op(struct percpu_ref *r) {}
int mddev_init_writes_pending(struct mddev *mddev)
{
if (mddev->writes_pending.percpu_count_ptr)
return 0;
if (percpu_ref_init(&mddev->writes_pending, no_op, 0, GFP_KERNEL) < 0)
return -ENOMEM;
/* We want to start with the refcount at zero */
percpu_ref_put(&mddev->writes_pending);
return 0;
}
EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
static int md_alloc(dev_t dev, char *name)
{
/*
@ -5239,10 +5251,6 @@ static int md_alloc(dev_t dev, char *name)
blk_queue_make_request(mddev->queue, md_make_request);
blk_set_stacking_limits(&mddev->queue->limits);
if (percpu_ref_init(&mddev->writes_pending, no_op, 0, GFP_KERNEL) < 0)
goto abort;
/* We want to start with the refcount at zero */
percpu_ref_put(&mddev->writes_pending);
disk = alloc_disk(1 << shift);
if (!disk) {
blk_cleanup_queue(mddev->queue);

1
drivers/md/md.h
View File

@ -648,6 +648,7 @@ extern void md_unregister_thread(struct md_thread **threadp);
extern void md_wakeup_thread(struct md_thread *thread);
extern void md_check_recovery(struct mddev *mddev);
extern void md_reap_sync_thread(struct mddev *mddev);
extern int mddev_init_writes_pending(struct mddev *mddev);
extern void md_write_start(struct mddev *mddev, struct bio *bi);
extern void md_write_inc(struct mddev *mddev, struct bio *bi);
extern void md_write_end(struct mddev *mddev);

2
drivers/md/raid1.c
View File

@ -3063,6 +3063,8 @@ static int raid1_run(struct mddev *mddev)
mdname(mddev));
return -EIO;
}
if (mddev_init_writes_pending(mddev) < 0)
return -ENOMEM;
/*
* copy the already verified devices into our private RAID1
* bookkeeping area. [whatever we allocate in run(),

3
drivers/md/raid10.c
View File

@ -3611,6 +3611,9 @@ static int raid10_run(struct mddev *mddev)
int first = 1;
bool discard_supported = false;
if (mddev_init_writes_pending(mddev) < 0)
return -ENOMEM;
if (mddev->private == NULL) {
conf = setup_conf(mddev);
if (IS_ERR(conf))

3
drivers/md/raid5.c
View File

@ -7118,6 +7118,9 @@ static int raid5_run(struct mddev *mddev)
long long min_offset_diff = 0;
int first = 1;
if (mddev_init_writes_pending(mddev) < 0)
return -ENOMEM;
if (mddev->recovery_cp != MaxSector)
pr_notice("md/raid:%s: not clean -- starting background reconstruction\n",
mdname(mddev));