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authorOmar Sandoval <osandov@fb.com>2017-01-25 08:06:42 -0800
committerJens Axboe <axboe@fb.com>2017-01-27 08:17:44 -0700
commit950cd7e9ffdc44c340b8914126b39cc079f0c844 (patch)
treea9f4e5fc7958b798e9cdb30da733c20b0f9af268 /block/blk-mq-debugfs.c
parent9abb2ad21e8b9b7a2555411fbee225a508cf962d (diff)
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blk-mq: move hctx->dispatch and ctx->rq_list from sysfs to debugfs
These lists are only useful for debugging; they definitely don't belong in sysfs. Putting them in debugfs also removes the limitation of a single page of output. Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-mq-debugfs.c')
-rw-r--r--block/blk-mq-debugfs.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 0c14511fa9e0..1967c06d80e0 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -29,6 +29,20 @@ struct blk_mq_debugfs_attr {
static struct dentry *block_debugfs_root;
+static int blk_mq_debugfs_seq_open(struct inode *inode, struct file *file,
+ const struct seq_operations *ops)
+{
+ struct seq_file *m;
+ int ret;
+
+ ret = seq_open(file, ops);
+ if (!ret) {
+ m = file->private_data;
+ m->private = inode->i_private;
+ }
+ return ret;
+}
+
static int hctx_state_show(struct seq_file *m, void *v)
{
struct blk_mq_hw_ctx *hctx = m->private;
@@ -69,12 +83,104 @@ static const struct file_operations hctx_flags_fops = {
.release = single_release,
};
+static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
+{
+ struct request *rq = list_entry_rq(v);
+
+ seq_printf(m, "%p\n", rq);
+ return 0;
+}
+
+static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
+{
+ struct blk_mq_hw_ctx *hctx = m->private;
+
+ spin_lock(&hctx->lock);
+ return seq_list_start(&hctx->dispatch, *pos);
+}
+
+static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ struct blk_mq_hw_ctx *hctx = m->private;
+
+ return seq_list_next(v, &hctx->dispatch, pos);
+}
+
+static void hctx_dispatch_stop(struct seq_file *m, void *v)
+{
+ struct blk_mq_hw_ctx *hctx = m->private;
+
+ spin_unlock(&hctx->lock);
+}
+
+static const struct seq_operations hctx_dispatch_seq_ops = {
+ .start = hctx_dispatch_start,
+ .next = hctx_dispatch_next,
+ .stop = hctx_dispatch_stop,
+ .show = blk_mq_debugfs_rq_show,
+};
+
+static int hctx_dispatch_open(struct inode *inode, struct file *file)
+{
+ return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops);
+}
+
+static const struct file_operations hctx_dispatch_fops = {
+ .open = hctx_dispatch_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos)
+{
+ struct blk_mq_ctx *ctx = m->private;
+
+ spin_lock(&ctx->lock);
+ return seq_list_start(&ctx->rq_list, *pos);
+}
+
+static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ struct blk_mq_ctx *ctx = m->private;
+
+ return seq_list_next(v, &ctx->rq_list, pos);
+}
+
+static void ctx_rq_list_stop(struct seq_file *m, void *v)
+{
+ struct blk_mq_ctx *ctx = m->private;
+
+ spin_unlock(&ctx->lock);
+}
+
+static const struct seq_operations ctx_rq_list_seq_ops = {
+ .start = ctx_rq_list_start,
+ .next = ctx_rq_list_next,
+ .stop = ctx_rq_list_stop,
+ .show = blk_mq_debugfs_rq_show,
+};
+
+static int ctx_rq_list_open(struct inode *inode, struct file *file)
+{
+ return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops);
+}
+
+static const struct file_operations ctx_rq_list_fops = {
+ .open = ctx_rq_list_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
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},
};
static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
+ {"rq_list", 0400, &ctx_rq_list_fops},
};
int blk_mq_debugfs_register(struct request_queue *q, const char *name)