It will be used by the following patches to create debugfs files under /sys/kernel/debug/mdX.
Signed-off-by: Hou Tao <[email protected]> --- drivers/md/Makefile | 2 +- drivers/md/md-debugfs.c | 35 +++++++++++++++++++++++++++++++++++ drivers/md/md-debugfs.h | 16 ++++++++++++++++ 3 files changed, 52 insertions(+), 1 deletion(-) create mode 100644 drivers/md/md-debugfs.c create mode 100644 drivers/md/md-debugfs.h diff --git a/drivers/md/Makefile b/drivers/md/Makefile index be7a6eb92abc..49355e3b4cce 100644 --- a/drivers/md/Makefile +++ b/drivers/md/Makefile @@ -19,7 +19,7 @@ dm-cache-y += dm-cache-target.o dm-cache-metadata.o dm-cache-policy.o \ dm-cache-smq-y += dm-cache-policy-smq.o dm-era-y += dm-era-target.o dm-verity-y += dm-verity-target.o -md-mod-y += md.o md-bitmap.o +md-mod-y += md.o md-bitmap.o md-debugfs.o raid456-y += raid5.o raid5-cache.o raid5-ppl.o dm-zoned-y += dm-zoned-target.o dm-zoned-metadata.o dm-zoned-reclaim.o linear-y += md-linear.o diff --git a/drivers/md/md-debugfs.c b/drivers/md/md-debugfs.c new file mode 100644 index 000000000000..318c35fed24f --- /dev/null +++ b/drivers/md/md-debugfs.c @@ -0,0 +1,35 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Based on debugfs_create_files() in blk-mq */ + +#include <linux/fs.h> +#include <linux/debugfs.h> + +#include "md-debugfs.h" + +static int md_debugfs_open(struct inode *inode, struct file *file) +{ + const struct md_debugfs_file *dbg_file = inode->i_private; + void *data = d_inode(file_dentry(file)->d_parent)->i_private; + + return single_open(file, dbg_file->show, data); +} + +static const struct file_operations md_debugfs_fops = { + .owner = THIS_MODULE, + .open = md_debugfs_open, + .llseek = seq_lseek, + .read = seq_read, + .release = single_release, +}; + +void md_debugfs_create_files(struct dentry *parent, void *data, + const struct md_debugfs_file *files) +{ + const struct md_debugfs_file *file; + + d_inode(parent)->i_private = data; + + for (file = files; file->name; file++) + debugfs_create_file(file->name, 0444, parent, + (void *)file, &md_debugfs_fops); +} diff --git a/drivers/md/md-debugfs.h b/drivers/md/md-debugfs.h new file mode 100644 index 000000000000..13b581d4ab63 --- /dev/null +++ b/drivers/md/md-debugfs.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef _MD_DEBUGFS_H +#define _MD_DEBUGFS_H + +#include <linux/seq_file.h> +#include <linux/debugfs.h> + +struct md_debugfs_file { + const char *name; + int (*show)(struct seq_file *m, void *data); +}; + +extern void md_debugfs_create_files(struct dentry *parent, void *data, + const struct md_debugfs_file *files); +#endif -- 2.22.0
