Subject: Re: [PATCH] dir.c: avoid stat() in valid_cached_dir()

From: Junio C Hamano <[email-masked]>
Date: Thu, 28 Dec 2017 11:10:42 -0800

Junio C Hamano <[email-masked]> writes:

>>  [1] https://public-inbox.org/git/[email-masked]/
>>
>>  dir.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/dir.c b/dir.c
>> index 7c4b45e30e..edcb7bb462 100644
>> --- a/dir.c
>> +++ b/dir.c
>> @@ -1809,7 +1809,7 @@ static int valid_cached_dir(struct dir_struct *dir,
>>  	 */
>>  	refresh_fsmonitor(istate);
>>  	if (!(dir->untracked->use_fsmonitor && untracked->valid)) {
>> -		if (stat(path->len ? path->buf : ".", &st)) {
>> +		if (lstat(path->len ? path->buf : ".", &st)) {

Hmph, I have to wonder if this is sufficient, though.  When you got
"a/b/c" in path->buf, is it sufficient to avoid mistaking 'c' that
is (eh, rather, "has unexpectedly turned into") a symbolic link to a
directory as a true directory?  Wouldn't we have to be equally careful
about "a" and "a/b" as well?

>>  			invalidate_directory(dir->untracked, untracked);
>>  			memset(&untracked->stat_data, 0, sizeof(untracked->stat_data));
>>  			return 0;