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Various places like I/O schedulers or the QOS infrastructure try to register debugfs files on demans, which can race with creating and removing the main queue debugfs directory. Use the existing debugfs_mutex to serialize all debugfs operations that rely on q->debugfs_dir or the directories hanging off it. To make the teardown code a little simpler declare all debugfs dentry pointers and not just the main one uncoditionally in blkdev.h. Move debugfs_mutex next to the dentries that it protects and document what it is used for. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220614074827.458955-3-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef INT_BLK_MQ_DEBUGFS_H
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#define INT_BLK_MQ_DEBUGFS_H
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#ifdef CONFIG_BLK_DEBUG_FS
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#include <linux/seq_file.h>
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struct blk_mq_hw_ctx;
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struct blk_mq_debugfs_attr {
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const char *name;
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umode_t mode;
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int (*show)(void *, struct seq_file *);
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ssize_t (*write)(void *, const char __user *, size_t, loff_t *);
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/* Set either .show or .seq_ops. */
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const struct seq_operations *seq_ops;
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};
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int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq);
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int blk_mq_debugfs_rq_show(struct seq_file *m, void *v);
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void blk_mq_debugfs_register(struct request_queue *q);
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void blk_mq_debugfs_register_hctx(struct request_queue *q,
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struct blk_mq_hw_ctx *hctx);
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void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx);
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void blk_mq_debugfs_register_hctxs(struct request_queue *q);
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void blk_mq_debugfs_unregister_hctxs(struct request_queue *q);
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void blk_mq_debugfs_register_sched(struct request_queue *q);
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void blk_mq_debugfs_unregister_sched(struct request_queue *q);
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void blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
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struct blk_mq_hw_ctx *hctx);
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void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx);
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void blk_mq_debugfs_register_rqos(struct rq_qos *rqos);
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void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos);
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void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q);
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#else
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static inline void blk_mq_debugfs_register(struct request_queue *q)
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{
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}
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static inline void blk_mq_debugfs_register_hctx(struct request_queue *q,
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struct blk_mq_hw_ctx *hctx)
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{
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}
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static inline void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
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{
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}
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static inline void blk_mq_debugfs_register_hctxs(struct request_queue *q)
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{
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}
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static inline void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
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{
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}
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static inline void blk_mq_debugfs_register_sched(struct request_queue *q)
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{
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}
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static inline void blk_mq_debugfs_unregister_sched(struct request_queue *q)
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{
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}
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static inline void blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
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struct blk_mq_hw_ctx *hctx)
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{
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}
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static inline void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
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{
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}
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static inline void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
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{
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}
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static inline void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
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{
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}
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static inline void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q)
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{
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}
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#endif
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#ifdef CONFIG_BLK_DEBUG_FS_ZONED
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int queue_zone_wlock_show(void *data, struct seq_file *m);
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#else
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static inline int queue_zone_wlock_show(void *data, struct seq_file *m)
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{
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return 0;
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}
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#endif
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#endif
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