예제 #1
0
파일: symlinks.c 프로젝트: AndyA/git-andya
/*
 * Invalidate the given 'name' from the cache, if 'name' matches
 * completely with the cache.
 */
void invalidate_lstat_cache(const char *name, int len)
{
	int match_len, previous_slash;

	match_len = longest_path_match(name, len, cache.path, cache.len,
				       &previous_slash);
	if (len == match_len) {
		if ((cache.track_flags & FL_DIR) && previous_slash > 0) {
			cache.path[previous_slash] = '\0';
			cache.len = previous_slash;
			cache.flags = FL_DIR;
		} else {
			reset_lstat_cache();
		}
	}
}
예제 #2
0
파일: symlinks.c 프로젝트: Fabiano-lr/git
/*
 * Invalidate the given 'name' from the cache, if 'name' matches
 * completely with the cache.
 */
void invalidate_lstat_cache(const char *name, int len)
{
	int match_len, previous_slash;
	struct cache_def *cache = &default_cache;	/* FIXME */

	match_len = longest_path_match(name, len, cache->path, cache->len,
				       &previous_slash);
	if (len == match_len) {
		if ((cache->track_flags & FL_DIR) && previous_slash > 0) {
			cache->path[previous_slash] = '\0';
			cache->len = previous_slash;
			cache->flags = FL_DIR;
		} else {
			reset_lstat_cache(cache);
		}
	}
}
예제 #3
0
파일: symlinks.c 프로젝트: AndyA/git-andya
/*
 * Check if name 'name' of length 'len' has a symlink leading
 * component, or if the directory exists and is real, or not.
 *
 * To speed up the check, some information is allowed to be cached.
 * This can be indicated by the 'track_flags' argument, which also can
 * be used to indicate that we should check the full path.
 *
 * The 'prefix_len_stat_func' parameter can be used to set the length
 * of the prefix, where the cache should use the stat() function
 * instead of the lstat() function to test each path component.
 */
static int lstat_cache(const char *name, int len,
		       int track_flags, int prefix_len_stat_func)
{
	int match_len, last_slash, last_slash_dir, previous_slash;
	int match_flags, ret_flags, save_flags, max_len, ret;
	struct stat st;

	if (cache.track_flags != track_flags ||
	    cache.prefix_len_stat_func != prefix_len_stat_func) {
		/*
		 * As a safeguard rule we clear the cache if the
		 * values of track_flags and/or prefix_len_stat_func
		 * does not match with the last supplied values.
		 */
		reset_lstat_cache();
		cache.track_flags = track_flags;
		cache.prefix_len_stat_func = prefix_len_stat_func;
		match_len = last_slash = 0;
	} else {
		/*
		 * Check to see if we have a match from the cache for
		 * the 2 "excluding" path types.
		 */
		match_len = last_slash =
			longest_path_match(name, len, cache.path, cache.len,
					   &previous_slash);
		match_flags = cache.flags & track_flags & (FL_NOENT|FL_SYMLINK);
		if (match_flags && match_len == cache.len)
			return match_flags;
		/*
		 * If we now have match_len > 0, we would know that
		 * the matched part will always be a directory.
		 *
		 * Also, if we are tracking directories and 'name' is
		 * a substring of the cache on a path component basis,
		 * we can return immediately.
		 */
		match_flags = track_flags & FL_DIR;
		if (match_flags && len == match_len)
			return match_flags;
	}

	/*
	 * Okay, no match from the cache so far, so now we have to
	 * check the rest of the path components.
	 */
	ret_flags = FL_DIR;
	last_slash_dir = last_slash;
	max_len = len < PATH_MAX ? len : PATH_MAX;
	while (match_len < max_len) {
		do {
			cache.path[match_len] = name[match_len];
			match_len++;
		} while (match_len < max_len && name[match_len] != '/');
		if (match_len >= max_len && !(track_flags & FL_FULLPATH))
			break;
		last_slash = match_len;
		cache.path[last_slash] = '\0';

		if (last_slash <= prefix_len_stat_func)
			ret = stat(cache.path, &st);
		else
			ret = lstat(cache.path, &st);

		if (ret) {
			ret_flags = FL_LSTATERR;
			if (errno == ENOENT)
				ret_flags |= FL_NOENT;
		} else if (S_ISDIR(st.st_mode)) {
			last_slash_dir = last_slash;
			continue;
		} else if (S_ISLNK(st.st_mode)) {
			ret_flags = FL_SYMLINK;
		} else {
			ret_flags = FL_ERR;
		}
		break;
	}

	/*
	 * At the end update the cache.  Note that max 3 different
	 * path types, FL_NOENT, FL_SYMLINK and FL_DIR, can be cached
	 * for the moment!
	 */
	save_flags = ret_flags & track_flags & (FL_NOENT|FL_SYMLINK);
	if (save_flags && last_slash > 0 && last_slash <= PATH_MAX) {
		cache.path[last_slash] = '\0';
		cache.len = last_slash;
		cache.flags = save_flags;
	} else if ((track_flags & FL_DIR) &&
		   last_slash_dir > 0 && last_slash_dir <= PATH_MAX) {
		/*
		 * We have a separate test for the directory case,
		 * since it could be that we have found a symlink or a
		 * non-existing directory and the track_flags says
		 * that we cannot cache this fact, so the cache would
		 * then have been left empty in this case.
		 *
		 * But if we are allowed to track real directories, we
		 * can still cache the path components before the last
		 * one (the found symlink or non-existing component).
		 */
		cache.path[last_slash_dir] = '\0';
		cache.len = last_slash_dir;
		cache.flags = FL_DIR;
	} else {
		reset_lstat_cache();
	}
	return ret_flags;
}
예제 #4
0
파일: symlinks.c 프로젝트: AndyA/git-andya
/*
 * Completely clear the contents of the cache
 */
void clear_lstat_cache(void)
{
	reset_lstat_cache();
}
예제 #5
0
파일: symlinks.c 프로젝트: Fabiano-lr/git
/*
 * Completely clear the contents of the cache
 */
void clear_lstat_cache(void)
{
	struct cache_def *cache = &default_cache;	/* FIXME */
	reset_lstat_cache(cache);
}