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merging pick_link() with get_link(), part 1

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Move restoring LOOKUP_PARENT and zeroing nd->stack.name[0] past
the call of get_link() (nothing _currently_ uses them in there).
That allows to moved the call of may_follow_link() into get_link()
as well, since now the presence of LOOKUP_PARENT distinguishes
the callers from each other (link_path_walk() has it, trailing_symlink()
doesn't).

Preparations for folding trailing_symlink() into callers (lookup_last()
and do_last()) and changing the calling conventions of those.  Next
stage after that will have get_link() call migrate into walk_component(),
then - into step_into().  It's tricky enough to warrant doing that
in stages, unfortunately...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-01-14 09:55:16 -05:00
parent a9dc1494a7
commit 43679723d2
1 changed files with 7 additions and 5 deletions
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12
fs/namei.c
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@ -1115,6 +1115,12 @@ const char *get_link(struct nameidata *nd)
int error;
const char *res;
if (!(nd->flags & LOOKUP_PARENT)) {
error = may_follow_link(nd);
if (unlikely(error))
return ERR_PTR(error);
}
if (unlikely(nd->flags & LOOKUP_NO_SYMLINKS))
return ERR_PTR(-ELOOP);
@ -2329,13 +2335,9 @@ static const char *path_init(struct nameidata *nd, unsigned flags)
static const char *trailing_symlink(struct nameidata *nd)
{
const char *s;
int error = may_follow_link(nd);
if (unlikely(error))
return ERR_PTR(error);
const char *s = get_link(nd);
nd->flags |= LOOKUP_PARENT;
nd->stack[0].name = NULL;
s = get_link(nd);
return s ? s : "";
}