[PATCH 11 of 12] Win32: fixed ngx_fs_bsize() for symlinks

[Sergey Kandaurov]

> On 13 Jan 2023, at 01:35, Maxim Dounin <mdounin at mdounin.ru> wrote:
> 
> # HG changeset patch
> # User Maxim Dounin <mdounin at mdounin.ru>
> # Date 1673549010 -10800
> #      Thu Jan 12 21:43:30 2023 +0300
> # Node ID be7eb9ec28dcbfdfd2e850befc8d051c0e4d46fd
> # Parent  e62c8e9724ba68a698a2c3613edca73fe4e1c4ae
> Win32: fixed ngx_fs_bsize() for symlinks.
> 
> Just a drive letter might not correctly represent file system being used,
> notably when using symlinks (as created by "mklink /d").  As such, instead
> of calling GetDiskFreeSpace() with just a drive letter, we now always
> use GetDiskFreeSpace() with full path.
> 
> diff -r e62c8e9724ba -r be7eb9ec28dc src/os/win32/ngx_files.c
> --- a/src/os/win32/ngx_files.c	Thu Jan 12 21:43:14 2023 +0300
> +++ b/src/os/win32/ngx_files.c	Thu Jan 12 21:43:30 2023 +0300
> @@ -955,14 +955,8 @@ ngx_directio_off(ngx_fd_t fd)
> size_t
> ngx_fs_bsize(u_char *name)
> {
> -    u_char  root[4];
>     u_long  sc, bs, nfree, ncl;
> 
> -    if (name[2] == ':') {
> -        ngx_cpystrn(root, name, 4);
> -        name = root;
> -    }
> -

BTW, I wonder how this condition could be true.
Specifically, what name should represent in order to match.
I'm happy that it's leaving though.

>     if (GetDiskFreeSpace((const char *) name, &sc, &bs, &nfree, &ncl) == 0) {
>         return 512;
>     }

-- 
Sergey Kandaurov