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bdi: Provide bdi_register_va() and bdi_alloc() 

Add function that registers bdi and takes va_list instead of variable
number of arguments.

Add bdi_alloc() as simple wrapper for NUMA-unaware users allocating BDI.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jan Kara 2017-04-12 12:24:25 +02:00 committed by Jens Axboe
parent 2bc19cd5fd
commit baf7a616d5
2 changed files with 21 additions and 5 deletions
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6
include/linux/backing-dev.h
View File

@ -30,6 +30,8 @@ void bdi_put(struct backing_dev_info *bdi);
__printf(3, 4)
int bdi_register(struct backing_dev_info *bdi, struct device *parent,
const char *fmt, ...);
int bdi_register_va(struct backing_dev_info *bdi, struct device *parent,
const char *fmt, va_list args);
int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev);
int bdi_register_owner(struct backing_dev_info *bdi, struct device *owner);
void bdi_unregister(struct backing_dev_info *bdi);
@ -37,6 +39,10 @@ void bdi_unregister(struct backing_dev_info *bdi);
int __must_check bdi_setup_and_register(struct backing_dev_info *, char *);
void bdi_destroy(struct backing_dev_info *bdi);
struct backing_dev_info *bdi_alloc_node(gfp_t gfp_mask, int node_id);
static inline struct backing_dev_info *bdi_alloc(gfp_t gfp_mask)
{
return bdi_alloc_node(gfp_mask, NUMA_NO_NODE);
}
void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
bool range_cyclic, enum wb_reason reason);

20
mm/backing-dev.c
View File

@ -856,18 +856,15 @@ struct backing_dev_info *bdi_alloc_node(gfp_t gfp_mask, int node_id)
return bdi;
}
int bdi_register(struct backing_dev_info *bdi, struct device *parent,
const char *fmt, ...)
int bdi_register_va(struct backing_dev_info *bdi, struct device *parent,
const char *fmt, va_list args)
{
va_list args;
struct device *dev;
if (bdi->dev) /* The driver needs to use separate queues per device */
return 0;
va_start(args, fmt);
dev = device_create_vargs(bdi_class, parent, MKDEV(0, 0), bdi, fmt, args);
va_end(args);
if (IS_ERR(dev))
return PTR_ERR(dev);
@ -884,6 +881,19 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
trace_writeback_bdi_register(bdi);
return 0;
}
EXPORT_SYMBOL(bdi_register_va);
int bdi_register(struct backing_dev_info *bdi, struct device *parent,
const char *fmt, ...)
{
va_list args;
int ret;
va_start(args, fmt);
ret = bdi_register_va(bdi, parent, fmt, args);
va_end(args);
return ret;
}
EXPORT_SYMBOL(bdi_register);
int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev)