[PATCH 03/18] fs: add symlink support

[Jean-Christophe PLAGNIOL-VILLARD]

On 15:35 Mon 27 Aug     , Sascha Hauer wrote:
> On Fri, Aug 24, 2012 at 06:50:03AM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > Limit it's support to existing file only
> > 
> > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
> > ---
> >  fs/fs.c      |   43 +++++++++++++++++++++++++++++++++++++++++++
> >  include/fs.h |    4 ++++
> >  2 files changed, 47 insertions(+)
> > 
> > diff --git a/fs/fs.c b/fs/fs.c
> > index c950054..a19e1f4 100644
> > --- a/fs/fs.c
> > +++ b/fs/fs.c
> > @@ -949,6 +949,49 @@ out:
> >  }
> >  EXPORT_SYMBOL(readlink);
> >  
> > +int symlink(const char *pathname, const char *newpath)
> > +{
> > +	struct fs_driver_d *fsdrv;
> > +	struct fs_device_d *fsdev;
> > +	char *p = normalise_path(pathname);
> > +	int ret;
> > +	struct stat s;
> > +
> > +	if (!stat(p, &s) && S_ISDIR(s.st_mode)) {
> > +		ret = -ENOSYS;
> > +		goto out;
> 
> You lose the memory allocated in normalise_path here.
yeap forget to put the free in out
> 
> > +	}
> > +
> > +	free(p);
> > +	p = normalise_path(newpath);
> 
> p is never freed again.
> 
> > +
> > +	ret = stat(p, &s);
> > +	if (!ret) {
> > +		ret = -EEXIST;
> > +		goto out;
> > +	}
> > +
> > +	fsdev = get_fs_device_and_root_path(&p);
> > +	if (!fsdev) {
> > +		ret = -ENODEV;
> > +		goto out;
> > +	}
> > +	fsdrv = fsdev->driver;
> > +
> > +	if (fsdrv->symlink) {
> > +		ret = fsdrv->symlink(&fsdev->dev, pathname, p);
> > +	} else {
> > +		ret = -EROFS;
> 
> Better:
> 
> EPERM  The file system containing newpath does not support the creation of symbolic links.
ok

Best Regards,
J.