Re: [PATCH 7/3] Make index preloading check the whole path to the file

From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 9 Jul 2009 13:37:02 -0700
Subject: [PATCH 7/3] Make index preloading check the whole path to the file

This uses the new thread-safe 'threaded_has_symlink_leading_path()'
function to efficiently verify that the whole path leading up to the
filename is a proper path, and does not contain symlinks.

This makes 'ce_uptodate()' a much stronger guarantee: it no longer just
guarantees that the 'lstat()' of the path would match, it also means
that we know that people haven't played games with moving directories
around and covered it up with symlinks.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

Totally trivial, now that we have a thread-safe symlink checker.

If we have leading symlinks in the cache-entry path, we will refuse to 
mark it up-to-date. There's no need to even try to stat anything under 
that directory.

 preload-index.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/preload-index.c b/preload-index.c
index 88edc5f..c3462dc 100644
--- a/preload-index.c
+++ b/preload-index.c

@@ -34,6 +34,7 @@ static void *preload_thread(void *_data)
 	struct thread_data *p = _data;
 	struct index_state *index = p->index;
 	struct cache_entry **cep = index->cache + p->offset;
+	struct cache_def cache;
 
 	nr = p->nr;
 	if (nr + p->offset > index->cache_nr)

@@ -49,6 +50,8 @@ static void *preload_thread(void *_data)
 			continue;
 		if (!ce_path_match(ce, p->pathspec))
 			continue;
+		if (threaded_has_symlink_leading_path(&cache, ce->name, ce_namelen(ce)))
+			continue;