UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

bcache: Alloc holder object before async registration 

Allocate holder object (cache or cached_dev) before offloading the
rest of the startup to async work. This will allow us to open the block
block device with proper holder.

Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Coly Li <colyli@suse.de>
Reviewed-by: Kent Overstreet <kent.overstreet@linux.dev>
Link: https://lore.kernel.org/r/20230622164658.12861-1-jack@suse.cz
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jan Kara 2023-06-22 18:46:54 +02:00 committed by Jens Axboe
parent c36591f682
commit abcc0cbd49
1 changed files with 25 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
drivers/md/bcache/super.c
View File

@ -2448,6 +2448,7 @@ struct async_reg_args {
struct cache_sb *sb;
struct cache_sb_disk *sb_disk;
struct block_device *bdev;
void *holder;
};
static void register_bdev_worker(struct work_struct *work)
@ -2455,22 +2456,13 @@ static void register_bdev_worker(struct work_struct *work)
int fail = false;
struct async_reg_args *args =
container_of(work, struct async_reg_args, reg_work.work);
struct cached_dev *dc;
dc = kzalloc(sizeof(*dc), GFP_KERNEL);
if (!dc) {
fail = true;
put_page(virt_to_page(args->sb_disk));
blkdev_put(args->bdev, bcache_kobj);
goto out;
}
mutex_lock(&bch_register_lock);
if (register_bdev(args->sb, args->sb_disk, args->bdev, dc) < 0)
if (register_bdev(args->sb, args->sb_disk, args->bdev, args->holder)
< 0)
fail = true;
mutex_unlock(&bch_register_lock);
out:
if (fail)
pr_info("error %s: fail to register backing device\n",
args->path);
@ -2485,21 +2477,11 @@ static void register_cache_worker(struct work_struct *work)
int fail = false;
struct async_reg_args *args =
container_of(work, struct async_reg_args, reg_work.work);
struct cache *ca;
ca = kzalloc(sizeof(*ca), GFP_KERNEL);
if (!ca) {
fail = true;
put_page(virt_to_page(args->sb_disk));
blkdev_put(args->bdev, bcache_kobj);
goto out;
}
/* blkdev_put() will be called in bch_cache_release() */
if (register_cache(args->sb, args->sb_disk, args->bdev, ca) != 0)
if (register_cache(args->sb, args->sb_disk, args->bdev, args->holder))
fail = true;
out:
if (fail)
pr_info("error %s: fail to register cache device\n",
args->path);
@ -2520,6 +2502,13 @@ static void register_device_async(struct async_reg_args *args)
queue_delayed_work(system_wq, &args->reg_work, 10);
}
static void *alloc_holder_object(struct cache_sb *sb)
{
if (SB_IS_BDEV(sb))
return kzalloc(sizeof(struct cached_dev), GFP_KERNEL);
return kzalloc(sizeof(struct cache), GFP_KERNEL);
}
static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
const char *buffer, size_t size)
{
@ -2528,6 +2517,7 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
struct cache_sb *sb;
struct cache_sb_disk *sb_disk;
struct block_device *bdev;
void *holder;
ssize_t ret;
bool async_registration = false;
@ -2585,6 +2575,13 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
if (err)
goto out_blkdev_put;
holder = alloc_holder_object(sb);
if (!holder) {
ret = -ENOMEM;
err = "cannot allocate memory";
goto out_put_sb_page;
}
err = "failed to register device";
if (async_registration) {
@ -2595,44 +2592,29 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
if (!args) {
ret = -ENOMEM;
err = "cannot allocate memory";
goto out_put_sb_page;
goto out_free_holder;
}
args->path = path;
args->sb = sb;
args->sb_disk = sb_disk;
args->bdev = bdev;
args->holder = holder;
register_device_async(args);
/* No wait and returns to user space */
goto async_done;
}
if (SB_IS_BDEV(sb)) {
struct cached_dev *dc = kzalloc(sizeof(*dc), GFP_KERNEL);
if (!dc) {
ret = -ENOMEM;
err = "cannot allocate memory";
goto out_put_sb_page;
}
mutex_lock(&bch_register_lock);
ret = register_bdev(sb, sb_disk, bdev, dc);
ret = register_bdev(sb, sb_disk, bdev, holder);
mutex_unlock(&bch_register_lock);
/* blkdev_put() will be called in cached_dev_free() */
if (ret < 0)
goto out_free_sb;
} else {
struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL);
if (!ca) {
ret = -ENOMEM;
err = "cannot allocate memory";
goto out_put_sb_page;
}
/* blkdev_put() will be called in bch_cache_release() */
ret = register_cache(sb, sb_disk, bdev, ca);
ret = register_cache(sb, sb_disk, bdev, holder);
if (ret)
goto out_free_sb;
}
@ -2644,6 +2626,8 @@ done:
async_done:
return size;
out_free_holder:
kfree(holder);
out_put_sb_page:
put_page(virt_to_page(sb_disk));
out_blkdev_put: