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-rw-r--r--block/blk-mq-tag.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h
new file mode 100644
index 00000000000..947ba2c6148
--- /dev/null
+++ b/block/blk-mq-tag.h
@@ -0,0 +1,27 @@
+#ifndef INT_BLK_MQ_TAG_H
+#define INT_BLK_MQ_TAG_H
+
+struct blk_mq_tags;
+
+extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node);
+extern void blk_mq_free_tags(struct blk_mq_tags *tags);
+
+extern unsigned int blk_mq_get_tag(struct blk_mq_tags *tags, gfp_t gfp, bool reserved);
+extern void blk_mq_wait_for_tags(struct blk_mq_tags *tags);
+extern void blk_mq_put_tag(struct blk_mq_tags *tags, unsigned int tag);
+extern void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data);
+extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
+extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
+
+enum {
+ BLK_MQ_TAG_CACHE_MIN = 1,
+ BLK_MQ_TAG_CACHE_MAX = 64,
+};
+
+enum {
+ BLK_MQ_TAG_FAIL = -1U,
+ BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
+ BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
+};
+
+#endif