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namei: take the treatment of absolute symlinks to get_link()

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rather than letting the callers handle the jump-to-root part of
semantics, do it right in get_link() and return the rest of the
body for the caller to deal with - at that point it's treated
the same way as relative symlinks would be.  And return NULL
when there's no "rest of the body" - those are treated the same
as pure jump symlink would be.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-05-10 11:01:00 -04:00
parent 4f697a5e17
commit fab51e8ab2
1 changed files with 20 additions and 29 deletions
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49
fs/namei.c
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@ -918,9 +918,24 @@ const char *get_link(struct nameidata *nd)
res = inode->i_link;
if (!res) {
res = inode->i_op->follow_link(dentry, &last->cookie);
if (IS_ERR_OR_NULL(res))
if (IS_ERR_OR_NULL(res)) {
last->cookie = NULL;
return res;
}
}
if (*res == '/') {
if (!nd->root.mnt)
set_root(nd);
path_put(&nd->path);
nd->path = nd->root;
path_get(&nd->root);
nd->inode = nd->path.dentry->d_inode;
nd->flags |= LOOKUP_JUMPED;
while (unlikely(*++res == '/'))
;
}
if (!*res)
res = NULL;
return res;
}
@ -1854,24 +1869,9 @@ static int link_path_walk(const char *name, struct nameidata *nd)
/* jumped */
put_link(nd);
} else {
if (*s == '/') {
if (!nd->root.mnt)
set_root(nd);
path_put(&nd->path);
nd->path = nd->root;
path_get(&nd->root);
nd->flags |= LOOKUP_JUMPED;
while (unlikely(*++s == '/'))
;
}
nd->inode = nd->path.dentry->d_inode;
if (unlikely(!*s)) {
put_link(nd);
} else {
nd->stack[nd->depth - 1].name = name;
name = s;
continue;
}
nd->stack[nd->depth - 1].name = name;
name = s;
continue;
}
}
if (!d_can_lookup(nd->path.dentry)) {
@ -2002,6 +2002,7 @@ static int trailing_symlink(struct nameidata *nd)
if (unlikely(error))
return error;
nd->flags |= LOOKUP_PARENT;
nd->stack[0].name = NULL;
s = get_link(nd);
if (unlikely(IS_ERR(s))) {
terminate_walk(nd);
@ -2009,16 +2010,6 @@ static int trailing_symlink(struct nameidata *nd)
}
if (unlikely(!s))
return 0;
if (*s == '/') {
if (!nd->root.mnt)
set_root(nd);
path_put(&nd->path);
nd->path = nd->root;
path_get(&nd->root);
nd->flags |= LOOKUP_JUMPED;
}
nd->inode = nd->path.dentry->d_inode;
nd->stack[0].name = NULL;
return link_path_walk(s, nd);
}