Provide bdi_alloc() forsimple allocation of a BDI that can be used by
filesystems that don't need anything fancy. We use this function when
converting filesystems from embedded struct backing_dev_info into a
dynamically allocated one.
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
include/linux/backing-dev.h | 1 +
mm/backing-dev.c | 15 +++++++++++++++
2 files changed, 16 insertions(+)
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index c52a48cb9a66..81c07ade4305 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -37,6 +37,7 @@ 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);
+struct backing_dev_info *bdi_alloc(gfp_t gfp_mask);
void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
bool range_cyclic, enum wb_reason reason);
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 28ce6cf7b2ff..7a5ba4163656 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -809,6 +809,21 @@ struct backing_dev_info *bdi_alloc_node(gfp_t gfp_mask, int node_id)
return bdi;
}
+struct backing_dev_info *bdi_alloc(gfp_t gfp_mask)
+{
+ struct backing_dev_info *bdi;
+
+ bdi = kmalloc(sizeof(struct backing_dev_info), gfp_mask | __GFP_ZERO);
+ if (!bdi)
+ return NULL;
+ if (bdi_init(bdi)) {
+ kfree(bdi);
+ return NULL;
+ }
+ return bdi;
+}
+EXPORT_SYMBOL(bdi_alloc);
+
int bdi_register(struct backing_dev_info *bdi, struct device *parent,
const char *fmt, ...)
{
--
2.10.2
--
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