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merging pick_link() with get_link(), part 3 

After a pure jump ("/" or procfs-style symlink) we don't need to
hold the link anymore.  link_path_walk() dropped it if such case
had been detected, lookup_last/do_last() (i.e. old trailing_symlink())
left it on the stack - it ended up calling terminate_walk() shortly
anyway, which would've purged the entire stack.

Do it in get_link() itself instead.  Simpler logics that way...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-01-14 13:07:57 -05:00
parent 1ccac622f9
commit 40fcf5a931
1 changed files with 9 additions and 9 deletions
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18
fs/namei.c
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@ -1154,7 +1154,9 @@ const char *get_link(struct nameidata *nd)
} else {
res = get(dentry, inode, &last->done);
}
if (IS_ERR_OR_NULL(res))
if (!res)
goto all_done;
if (IS_ERR(res))
return res;
}
if (*res == '/') {
@ -1164,9 +1166,11 @@ const char *get_link(struct nameidata *nd)
while (unlikely(*++res == '/'))
;
}
if (!*res)
res = NULL;
return res;
if (*res)
return res;
all_done: // pure jump
put_link(nd);
return NULL;
}
/*
@ -2211,11 +2215,7 @@ OK:
if (IS_ERR(s))
return PTR_ERR(s);
err = 0;
if (unlikely(!s)) {
/* jumped */
put_link(nd);
} else {
if (likely(s)) {
nd->stack[nd->depth - 1].name = name;
name = s;
continue;