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SubjectRe: [PATCH 05/39] vfs: optionally don't account file in nr_files
On Tue, May 29, 2018 at 04:43:05PM +0200, Miklos Szeredi wrote:
> +++ b/fs/open.c
> @@ -732,8 +732,8 @@ static int do_dentry_open(struct file *f,
> static const struct file_operations empty_fops = {};
> int error;
>
> - f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK |
> - FMODE_PREAD | FMODE_PWRITE;
> + f->f_mode = (f->f_mode & FMODE_NOACCOUNT) | OPEN_FMODE(f->f_flags) |
> + FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE;

Why bother with this complexity? I mean, why not simply
f->f_mode |= OPEN_FMODE(f->f_flags) | FMODE_LSEEK |
FMODE_PREAD | FMODE_PWRITE;

and be done with that...

> @@ -743,7 +743,7 @@ static int do_dentry_open(struct file *f,
> f->f_wb_err = filemap_sample_wb_err(f->f_mapping);
>
> if (unlikely(f->f_flags & O_PATH)) {
> - f->f_mode = FMODE_PATH;
> + f->f_mode = (f->f_mode & FMODE_NOACCOUNT) | FMODE_PATH;

That makes no sense at all. What would ever pass O_PATH opens
from "noaccount" call site?

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