On Tue, Mar 16 2021, Fox Chen wrote: > get_link() is merged into pick_link(). i_op->follow_link is > replaced with i_op->get_link(). get_link() can return ERR_PTR(0) > which equals NULL. > > Signed-off-by: Fox Chen <foxhlc...@gmail.com> > --- > Documentation/filesystems/path-lookup.rst | 13 ++++++------- > 1 file changed, 6 insertions(+), 7 deletions(-) > > diff --git a/Documentation/filesystems/path-lookup.rst > b/Documentation/filesystems/path-lookup.rst > index abd0153e2415..eef6e9f68fba 100644 > --- a/Documentation/filesystems/path-lookup.rst > +++ b/Documentation/filesystems/path-lookup.rst > @@ -1134,10 +1134,10 @@ Symlinks with no final component > > A pair of special-case symlinks deserve a little further explanation. > Both result in a new ``struct path`` (with mount and dentry) being set > -up in the ``nameidata``, and result in ``get_link()`` returning ``NULL``. > +up in the ``nameidata``, and result in ``pick_link()`` returning ``NULL``. > > The more obvious case is a symlink to "``/``". All symlinks starting > -with "``/``" are detected in ``get_link()`` which resets the ``nameidata`` > +with "``/``" are detected in ``pick_link()`` which resets the ``nameidata`` > to point to the effective filesystem root. If the symlink only > contains "``/``" then there is nothing more to do, no components at all, > so ``NULL`` is returned to indicate that the symlink can be released and > @@ -1154,12 +1154,11 @@ something that looks like a symlink. It is really a > reference to the > target file, not just the name of it. When you ``readlink`` these > objects you get a name that might refer to the same file - unless it > has been unlinked or mounted over. When ``walk_component()`` follows > -one of these, the ``->follow_link()`` method in "procfs" doesn't return > +one of these, the ``->get_link()`` method in "procfs" doesn't return > a string name, but instead calls ``nd_jump_link()`` which updates the > -``nameidata`` in place to point to that target. ``->follow_link()`` then > -returns ``NULL``. Again there is no final component and ``get_link()`` > -reports this by leaving the ``last_type`` field of ``nameidata`` as > -``LAST_BIND``. > +``nameidata`` in place to point to that target. ``->get_link()`` then > +returns ``0``. Again there is no final component and ``pick_link()``
Why did you change NULL to 0? ->get_link returns a pointer. Without that change: Reviewed-by: NeilBrown <ne...@suse.de> Thanks, NeilBrown > +returns NULL. > > Following the symlink in the final component > -------------------------------------------- > -- > 2.30.2
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