diff options
| -rw-r--r-- | fs/namei.c | 30 |
1 files changed, 20 insertions, 10 deletions
diff --git a/fs/namei.c b/fs/namei.c index 19e5c8a27ea4..1c9af92518a1 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1577,7 +1577,9 @@ static inline int should_follow_link(struct dentry *dentry, int follow) return unlikely(d_is_symlink(dentry)) ? follow : 0; } -static int walk_component(struct nameidata *nd, int follow) +enum {WALK_GET = 1, WALK_PUT = 2}; + +static int walk_component(struct nameidata *nd, int flags) { struct path path; struct inode *inode; @@ -1587,8 +1589,12 @@ static int walk_component(struct nameidata *nd, int follow) * to be able to know about the current root directory and * parent relationships. */ - if (unlikely(nd->last_type != LAST_NORM)) - return handle_dots(nd, nd->last_type); + if (unlikely(nd->last_type != LAST_NORM)) { + err = handle_dots(nd, nd->last_type); + if (flags & WALK_PUT) + put_link(nd); + return err; + } err = lookup_fast(nd, &path, &inode); if (unlikely(err)) { if (err < 0) @@ -1604,7 +1610,9 @@ static int walk_component(struct nameidata *nd, int follow) goto out_path_put; } - if (should_follow_link(path.dentry, follow)) { + if (flags & WALK_PUT) + put_link(nd); + if (should_follow_link(path.dentry, flags & WALK_GET)) { if (nd->flags & LOOKUP_RCU) { if (unlikely(nd->path.mnt != path.mnt || unlazy_walk(nd, path.dentry))) { @@ -1816,10 +1824,9 @@ OK: if (!name) return 0; /* last component of nested symlink */ - err = walk_component(nd, LOOKUP_FOLLOW); - put_link(nd); + err = walk_component(nd, WALK_GET | WALK_PUT); } else { - err = walk_component(nd, LOOKUP_FOLLOW); + err = walk_component(nd, WALK_GET); } if (err < 0) break; @@ -2017,9 +2024,12 @@ static inline int lookup_last(struct nameidata *nd) nd->flags |= LOOKUP_FOLLOW | LOOKUP_DIRECTORY; nd->flags &= ~LOOKUP_PARENT; - err = walk_component(nd, nd->flags & LOOKUP_FOLLOW); - if (nd->depth) - put_link(nd); + err = walk_component(nd, + nd->flags & LOOKUP_FOLLOW + ? nd->depth + ? WALK_PUT | WALK_GET + : WALK_GET + : 0); if (err < 0) terminate_walk(nd); return err; |