diff options
| -rw-r--r-- | fs/namei.c | 48 |
1 files changed, 22 insertions, 26 deletions
diff --git a/fs/namei.c b/fs/namei.c index b9e537980ef5..4521b5ff7c93 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1362,6 +1362,7 @@ static int link_path_walk(const char *name, struct nameidata *nd) unsigned long hash; struct qstr this; unsigned int c; + int type; nd->flags |= LOOKUP_CONTINUE; @@ -1381,6 +1382,16 @@ static int link_path_walk(const char *name, struct nameidata *nd) this.len = name - (const char *) this.name; this.hash = end_name_hash(hash); + type = LAST_NORM; + if (this.name[0] == '.') switch (this.len) { + case 2: + if (this.name[1] == '.') + type = LAST_DOTDOT; + break; + case 1: + type = LAST_DOT; + } + /* remove trailing slashes? */ if (!c) goto last_component; @@ -1393,21 +1404,17 @@ static int link_path_walk(const char *name, struct nameidata *nd) * to be able to know about the current root directory and * parent relationships. */ - if (this.name[0] == '.') switch (this.len) { - default: - break; - case 2: - if (this.name[1] != '.') - break; + if (unlikely(type != LAST_NORM)) { + if (type == LAST_DOTDOT) { if (nd->flags & LOOKUP_RCU) { if (follow_dotdot_rcu(nd)) return -ECHILD; } else follow_dotdot(nd); - /* fallthrough */ - case 1: - continue; + } + continue; } + /* This does the actual lookups.. */ err = do_lookup(nd, &this, &next, &inode); if (err) @@ -1441,20 +1448,15 @@ last_component: nd->flags &= lookup_flags | ~LOOKUP_CONTINUE; if (lookup_flags & LOOKUP_PARENT) goto lookup_parent; - if (this.name[0] == '.') switch (this.len) { - default: - break; - case 2: - if (this.name[1] != '.') - break; + if (unlikely(type != LAST_NORM)) { + if (type == LAST_DOTDOT) { if (nd->flags & LOOKUP_RCU) { if (follow_dotdot_rcu(nd)) return -ECHILD; } else follow_dotdot(nd); - /* fallthrough */ - case 1: - goto return_reval; + } + goto return_reval; } err = do_lookup(nd, &this, &next, &inode); if (err) @@ -1480,14 +1482,8 @@ last_component: goto return_base; lookup_parent: nd->last = this; - nd->last_type = LAST_NORM; - if (this.name[0] != '.') - goto return_base; - if (this.len == 1) - nd->last_type = LAST_DOT; - else if (this.len == 2 && this.name[1] == '.') - nd->last_type = LAST_DOTDOT; - else + nd->last_type = type; + if (type == LAST_NORM) goto return_base; return_reval: /* |