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block: Dynamically allocate and refcount backing_dev_info

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Instead of storing backing_dev_info inside struct request_queue,
allocate it dynamically, reference count it, and free it when the last
reference is dropped. Currently only request_queue holds the reference
but in the following patch we add other users referencing
backing_dev_info.

Signed-off-by: Jan Kara <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jan Kara 2017-02-02 15:56:51 +01:00 • committed by Jens Axboe
commit d03f6cdc1f
6 changed files with 50 additions and 11 deletions
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34
mm/backing-dev.c
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@ -237,6 +237,7 @@ static __init int bdi_class_init(void)
bdi_class->dev_groups = bdi_dev_groups;
bdi_debug_init();
return 0;
}
postcore_initcall(bdi_class_init);
@ -776,6 +777,7 @@ int bdi_init(struct backing_dev_info *bdi)
bdi->dev = NULL;
kref_init(&bdi->refcnt);
bdi->min_ratio = 0;
bdi->max_ratio = 100;
bdi->max_prop_frac = FPROP_FRAC_BASE;
@ -791,6 +793,22 @@ int bdi_init(struct backing_dev_info *bdi)
}
EXPORT_SYMBOL(bdi_init);
struct backing_dev_info *bdi_alloc_node(gfp_t gfp_mask, int node_id)
{
struct backing_dev_info *bdi;
bdi = kmalloc_node(sizeof(struct backing_dev_info),
gfp_mask | __GFP_ZERO, node_id);
if (!bdi)
return NULL;
if (bdi_init(bdi)) {
kfree(bdi);
return NULL;
}
return bdi;
}
int bdi_register(struct backing_dev_info *bdi, struct device *parent,
const char *fmt, ...)
{
@ -871,12 +889,26 @@ void bdi_unregister(struct backing_dev_info *bdi)
}
}
void bdi_exit(struct backing_dev_info *bdi)
static void bdi_exit(struct backing_dev_info *bdi)
{
WARN_ON_ONCE(bdi->dev);
wb_exit(&bdi->wb);
}
static void release_bdi(struct kref *ref)
{
struct backing_dev_info *bdi =
container_of(ref, struct backing_dev_info, refcnt);
bdi_exit(bdi);
kfree(bdi);
}
void bdi_put(struct backing_dev_info *bdi)
{
kref_put(&bdi->refcnt, release_bdi);
}
void bdi_destroy(struct backing_dev_info *bdi)
{
bdi_unregister(bdi);