From: Yu Kuai yukuai3@huawei.com
mainline inclusion from mainline-v6.7-rc1 commit d58eff83bd3c6166944f6b159544438385d48549 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8T02O
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
--------------------------------
'active_io' is used for mddev_suspend() and it's initialized in md_run(), this restrict that 'reconfig_mutex' must be held and "mddev->pers" must be set before calling mddev_suspend().
Initialize 'active_io' early so that mddev_suspend() is safe to call once mddev is allocated, this will be helpful to refactor mddev_suspend() in following patches.
Signed-off-by: Yu Kuai yukuai3@huawei.com Signed-off-by: Song Liu song@kernel.org Link: https://lore.kernel.org/r/20230825030956.1527023-2-yukuai1@huaweicloud.com Signed-off-by: Li Nan linan122@huawei.com --- drivers/md/md.h | 3 ++- drivers/md/dm-raid.c | 7 +++++- drivers/md/md.c | 53 +++++++++++++++++++++++++++----------------- 3 files changed, 41 insertions(+), 22 deletions(-)
diff --git a/drivers/md/md.h b/drivers/md/md.h index c4a585d89866..bd5b5db1e579 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -796,7 +796,8 @@ extern int md_integrity_register(struct mddev *mddev); extern int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev); extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale);
-extern void mddev_init(struct mddev *mddev); +extern int mddev_init(struct mddev *mddev); +extern void mddev_destroy(struct mddev *mddev); struct mddev *md_alloc(dev_t dev, char *name); void mddev_put(struct mddev *mddev); extern int md_run(struct mddev *mddev); diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index 5f9991765f27..69805d37e113 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -749,7 +749,11 @@ static struct raid_set *raid_set_alloc(struct dm_target *ti, struct raid_type *r return ERR_PTR(-ENOMEM); }
- mddev_init(&rs->md); + if (mddev_init(&rs->md)) { + kfree(rs); + ti->error = "Cannot initialize raid context"; + return ERR_PTR(-ENOMEM); + }
rs->raid_disks = raid_devs; rs->delta_disks = 0; @@ -798,6 +802,7 @@ static void raid_set_free(struct raid_set *rs) dm_put_device(rs->ti, rs->dev[i].data_dev); }
+ mddev_destroy(&rs->md); kfree(rs); }
diff --git a/drivers/md/md.c b/drivers/md/md.c index 9af395ecd6ee..d71ddab702b2 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -639,8 +639,20 @@ void mddev_put(struct mddev *mddev) static void md_safemode_timeout(struct timer_list *t); static void md_start_sync(struct work_struct *ws);
-void mddev_init(struct mddev *mddev) +static void active_io_release(struct percpu_ref *ref) { + struct mddev *mddev = container_of(ref, struct mddev, active_io); + + wake_up(&mddev->sb_wait); +} + +int mddev_init(struct mddev *mddev) +{ + + if (percpu_ref_init(&mddev->active_io, active_io_release, + PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) + return -ENOMEM; + mutex_init(&mddev->open_mutex); mutex_init(&mddev->reconfig_mutex); mutex_init(&mddev->sync_mutex); @@ -665,9 +677,17 @@ void mddev_init(struct mddev *mddev)
INIT_WORK(&mddev->sync_work, md_start_sync); INIT_WORK(&mddev->del_work, mddev_delayed_delete); + + return 0; } EXPORT_SYMBOL_GPL(mddev_init);
+void mddev_destroy(struct mddev *mddev) +{ + percpu_ref_exit(&mddev->active_io); +} +EXPORT_SYMBOL_GPL(mddev_destroy); + static struct mddev *mddev_find_locked(dev_t unit) { struct mddev *mddev; @@ -711,13 +731,16 @@ static struct mddev *mddev_alloc(dev_t unit) new = kzalloc(sizeof(*new), GFP_KERNEL); if (!new) return ERR_PTR(-ENOMEM); - mddev_init(new); + + error = mddev_init(new); + if (error) + goto out_free_new;
spin_lock(&all_mddevs_lock); if (unit) { error = -EEXIST; if (mddev_find_locked(unit)) - goto out_free_new; + goto out_destroy_new; new->unit = unit; if (MAJOR(unit) == MD_MAJOR) new->md_minor = MINOR(unit); @@ -728,7 +751,7 @@ static struct mddev *mddev_alloc(dev_t unit) error = -ENODEV; new->unit = mddev_alloc_unit(); if (!new->unit) - goto out_free_new; + goto out_destroy_new; new->md_minor = MINOR(new->unit); new->hold_active = UNTIL_STOP; } @@ -736,8 +759,11 @@ static struct mddev *mddev_alloc(dev_t unit) list_add(&new->all_mddevs, &all_mddevs); spin_unlock(&all_mddevs_lock); return new; -out_free_new: + +out_destroy_new: spin_unlock(&all_mddevs_lock); + mddev_destroy(new); +out_free_new: kfree(new); return ERR_PTR(error); } @@ -748,6 +774,7 @@ static void mddev_free(struct mddev *mddev) list_del(&mddev->all_mddevs); spin_unlock(&all_mddevs_lock);
+ mddev_destroy(mddev); kfree(mddev); }
@@ -5780,12 +5807,6 @@ static void md_safemode_timeout(struct timer_list *t) }
static int start_dirty_degraded; -static void active_io_release(struct percpu_ref *ref) -{ - struct mddev *mddev = container_of(ref, struct mddev, active_io); - - wake_up(&mddev->sb_wait); -}
int md_run(struct mddev *mddev) { @@ -5866,15 +5887,10 @@ int md_run(struct mddev *mddev) nowait = nowait && bdev_nowait(rdev->bdev); }
- err = percpu_ref_init(&mddev->active_io, active_io_release, - PERCPU_REF_ALLOW_REINIT, GFP_KERNEL); - if (err) - return err; - if (!bioset_initialized(&mddev->bio_set)) { err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); if (err) - goto exit_active_io; + return err; } if (!bioset_initialized(&mddev->sync_set)) { err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); @@ -6071,8 +6087,6 @@ int md_run(struct mddev *mddev) bioset_exit(&mddev->sync_set); exit_bio_set: bioset_exit(&mddev->bio_set); -exit_active_io: - percpu_ref_exit(&mddev->active_io); return err; } EXPORT_SYMBOL_GPL(md_run); @@ -6288,7 +6302,6 @@ static void __md_stop(struct mddev *mddev) module_put(pers->owner); clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
- percpu_ref_exit(&mddev->active_io); bioset_exit(&mddev->bio_set); bioset_exit(&mddev->sync_set); bioset_exit(&mddev->io_clone_set);