diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2015-04-18 20:21:40 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-05-10 22:19:57 -0400 |
| commit | bdf6cbf17923c08dafca70f0231817de1f9d1f30 (patch) | |
| tree | c237ba7f2ed3876c0197cbeff839eec8b7e6ee8e /fs/namei.c | |
| parent | bb8603f8e166e49f02f865213feee7afddeac9b0 (diff) | |
| download | lwn-bdf6cbf17923c08dafca70f0231817de1f9d1f30.tar.gz lwn-bdf6cbf17923c08dafca70f0231817de1f9d1f30.zip | |
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>
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/fs/namei.c b/fs/namei.c index 9f45d339cf45..b469ce26ff74 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -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, |