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Commit 0bfa5288 authored by Omar Sandoval's avatar Omar Sandoval Committed by Jens Axboe
Browse files

blk-mq: export software queue pending map to debugfs 



This is useful for debugging problems where we've gotten stuck with
requests in the software queues.

Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarOmar Sandoval <osandov@fb.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 24af1ccf

block/blk-mq-debugfs.c

+21 −0
Original line number Diff line number Diff line
@@ -134,6 +134,26 @@ static const struct file_operations hctx_dispatch_fops = { 
	.release	= seq_release,

};



static int hctx_ctx_map_show(struct seq_file *m, void *v)

{

	struct blk_mq_hw_ctx *hctx = m->private;



	sbitmap_bitmap_show(&hctx->ctx_map, m);

	return 0;

}



static int hctx_ctx_map_open(struct inode *inode, struct file *file)

{

	return single_open(file, hctx_ctx_map_show, inode->i_private);

}



static const struct file_operations hctx_ctx_map_fops = {

	.open		= hctx_ctx_map_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos)

{

	struct blk_mq_ctx *ctx = m->private;
@@ -179,6 +199,7 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { 
	{"state", 0400, &hctx_state_fops},

	{"flags", 0400, &hctx_flags_fops},

	{"dispatch", 0400, &hctx_dispatch_fops},

	{"ctx_map", 0400, &hctx_ctx_map_fops},

};



static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {