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link_path_walk: final preparations to killing recursion 

reduce the number of returns in there - turn all places
where it returns zero into goto OK and places where it
returns non-zero into goto Err.  The only non-trivial
detail is that all breaks in the loop are guaranteed
to be with non-zero err.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-04-18 20:21:40 -04:00
parent bb8603f8e1
commit bdf6cbf179
1 changed files with 11 additions and 7 deletions
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18
fs/namei.c
View File

@ -1716,7 +1716,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
while (*name=='/')
name++;
if (!*name)
return 0;
goto OK;
/* At this point we know we have a real path component. */
for(;;) {
@ -1759,7 +1759,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
name += hashlen_len(hash_len);
if (!*name)
return 0;
goto OK;
/*
* If it wasn't NUL, we know it was '/'. Skip that
* slash, and continue until no more slashes.
@ -1768,12 +1768,12 @@ static int link_path_walk(const char *name, struct nameidata *nd)
name++;
} while (unlikely(*name == '/'));
if (!*name)
return 0;
goto OK;
err = walk_component(nd, LOOKUP_FOLLOW);
Walked:
if (err < 0)
return err;
goto Err;
if (err) {
struct path link;
@ -1783,7 +1783,8 @@ Walked:
if (unlikely(current->link_count >= MAX_NESTED_LINKS)) {
path_put_conditional(&nd->link, nd);
path_put(&nd->path);
return -ELOOP;
err = -ELOOP;
goto Err;
}
BUG_ON(nd->depth >= MAX_NESTED_LINKS);
@ -1797,7 +1798,7 @@ Walked:
err = PTR_ERR(s);
current->link_count--;
nd->depth--;
return err;
goto Err;
}
err = 0;
if (unlikely(!s)) {
@ -1820,7 +1821,7 @@ Walked:
put_link(nd, &link, cookie);
current->link_count--;
nd->depth--;
return err;
goto Err;
} else {
err = walk_component(nd, LOOKUP_FOLLOW);
put_link(nd, &link, cookie);
@ -1836,7 +1837,10 @@ Walked:
}
}
terminate_walk(nd);
Err:
return err;
OK:
return 0;
}
static int path_init(int dfd, const struct filename *name, unsigned int flags,