kernfs

• it’s user : cgroup

struct kernfs_ops {
	/*
	 * Optional open/release methods.  Both are called with
	 * @of->seq_file populated.
	 */
	int (*open)(struct kernfs_open_file *of);
	void (*release)(struct kernfs_open_file *of);

	/*
	 * Read is handled by either seq_file or raw_read().
	 *
	 * If seq_show() is present, seq_file path is active.  Other seq
	 * operations are optional and if not implemented, the behavior is
	 * equivalent to single_open().  @sf->private points to the
	 * associated kernfs_open_file.
	 *
	 * read() is bounced through kernel buffer and a read larger than
	 * PAGE_SIZE results in partial operation of PAGE_SIZE.
	 */
	int (*seq_show)(struct seq_file *sf, void *v);

	void *(*seq_start)(struct seq_file *sf, loff_t *ppos);
	void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos);
	void (*seq_stop)(struct seq_file *sf, void *v);

• It seems there is another libfs provide seq_next
  • Oh yes, it’s /home/maritns3/core/linux/fs/seq_file.c
• kernfs_open_file : oh shit, the fucking kernfs

补充资料

https://en.wikipedia.org/wiki/NVM_Express

https://nvmexpress.org/education/drivers/linux-driver-information/

M.2 is a physical standard that defines the shape, dimensions, and the physical connector itself.

nvme-cli 使用的教程: https://www.nvmedeveloperdays.com/English/Collaterals/Proceedings/2018/20181204_PRECON2_Hands.pdf

http://blog.coderhuo.tech/2020/07/18/flash_basics/ : 讲解的不错

• https://pages.cs.wisc.edu/~remzi/OSTEP/file-ssd.pdf : 似乎是一个教程中的一部分

• https://www.jinbuguo.com/storage/ssd_intro.html

https://www.youtube.com/watch?v=NtkKHhXf3V4

sysfs 和 procfs 是使用的 kernfs 吗?

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