On Wed, 2017-05-03 at 12:18 -0700, Omar Sandoval wrote:
> From: Omar Sandoval <osan...@fb.com>
>
> A large part of blk-mq-debugfs.c is file_operations and seq_file
> boilerplate. This sucks as is but will suck even more when schedulers
> can define their own debugfs entries. Factor it all out into a single
> blk_mq_debugfs_fops which multiplexes as needed. We store the
> request_queue, blk_mq_hw_ctx, or blk_mq_ctx in the parent directory
> dentry, which is kind of hacky, but it works.
>
> Signed-off-by: Omar Sandoval <osan...@fb.com>
> ---
> block/blk-mq-debugfs.c | 469
> +++++++++++++++----------------------------------
> 1 file changed, 138 insertions(+), 331 deletions(-)
>
> diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
> index f58a116d6cca..00cc89c34590 100644
> --- a/block/blk-mq-debugfs.c
> +++ b/block/blk-mq-debugfs.c
> @@ -26,23 +26,12 @@
> struct blk_mq_debugfs_attr {
> const char *name;
> umode_t mode;
> - const struct file_operations *fops;
> + int (*show)(void *, struct seq_file *);
Hello Omar,
The current show functions have the seq_file pointer as first argument
but for .show() it is the second argument. Please consider to keep that
pointer as the first argument.
> +static ssize_t queue_state_write(void *data, const char __user *buf,
> + size_t count, loff_t *ppos)
> {
> - struct request_queue *q = file_inode(file)->i_private;
> + struct request_queue *q = data;
> char op[16] = { }, *s;
>
> - len = min(len, sizeof(op) - 1);
> - if (copy_from_user(op, ubuf, len))
> + if (copy_from_user(op, buf, min(count, sizeof(op) - 1)))
> return -EFAULT;
> s = op;
> strsep(&s, " \t\n"); /* strip trailing whitespace */
> @@ -127,22 +115,9 @@ static ssize_t blk_queue_flags_store(struct file *file,
> const char __user *ubuf,
> __func__, op);
> return -EINVAL;
> }
> - return len;
> -}
> -
> -static int blk_queue_flags_open(struct inode *inode, struct file *file)
> -{
> - return single_open(file, blk_queue_flags_show, inode->i_private);
> + return count;
> }
Please move the return value changes of queue_state_write() into a separate
patch since these are a bug fix and not related to the removal of the
boilerplate code.
Thanks,
Bart.
