On Thu, May 11, 2017 at 11:11:00AM +0200, Sascha Hauer wrote:
> So far links can only point to files. Implement links to
> directories. With this all kinds of links are supported:
>
> - relative links
> - absolute links
> - links including ".."
> - link loops (are detected, return -EMLINK)
>
> Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> ---
> commands/readlink.c | 2 +-
> fs/fs.c | 272 +++++++++++++++++++++++++++++-----------------------
> include/fs.h | 3 +-
> 3 files changed, 157 insertions(+), 120 deletions(-)
>
> diff --git a/commands/readlink.c b/commands/readlink.c
> index 4ac576f16f..a19c8e0041 100644
> --- a/commands/readlink.c
> +++ b/commands/readlink.c
[...]
> int stat(const char *filename, struct stat *s)
> {
> - char *f;
> + char *path = canonicalize_path(filename);
> + int ret;
>
> - f = realfile(filename, s);
> - if (IS_ERR(f))
> - return PTR_ERR(f);
> + if (IS_ERR(path))
> + return PTR_ERR(path);
>
> - free(f);
> - return 0;
> + ret = lstat(path, s);
> +
> + free(path);
> +
> + return ret;
> }
The following is missing in this patch, it slipped into a debug
patch I removed from this series:
int lstat(const char *filename, struct stat *s)
{
char *f = canonicalize_dir(filename);
int ret;
if (IS_ERR(f))
return PTR_ERR(f);
ret = __lstat(f, s);
free(f);
return ret;
}
Sascha
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