@@ -301,9 +301,25 @@ void refresh_fsmonitor(struct index_state *istate)
core_fsmonitor, query_success ? "success" : "failure");
}
- /* a fsmonitor process can return '/' to indicate all entries are invalid */
+ /*
+ * The response from FSMonitor (excluding the header token) is
+ * either:
+ *
+ * [a] a (possibly empty) list of NUL delimited relative
+ * pathnames of changed paths. This list can contain
+ * files and directories. Directories have a trailing
+ * slash.
+ *
+ * [b] a single '/' to indicate the provider had no
+ * information and that we should consider everything
+ * invalid. We call this a trivial response.
+ */
if (query_success && query_result.buf[bol] != '/') {
- /* Mark all entries returned by the monitor as dirty */
+ /*
+ * Mark all pathnames returned by the monitor as dirty.
+ *
+ * This updates both the cache-entries and the untracked-cache.
+ */
buf = query_result.buf;
for (i = bol; i < query_result.len; i++) {
if (buf[i] != '\0')
@@ -318,11 +334,15 @@ void refresh_fsmonitor(struct index_state *istate)
if (istate->untracked)
istate->untracked->use_fsmonitor = 1;
} else {
-
- /* We only want to run the post index changed hook if we've actually changed entries, so keep track
- * if we actually changed entries or not */
+ /*
+ * We received a trivial response, so invalidate everything.
+ *
+ * We only want to run the post index changed hook if
+ * we've actually changed entries, so keep track if we
+ * actually changed entries or not.
+ */
int is_cache_changed = 0;
- /* Mark all entries invalid */
+
for (i = 0; i < istate->cache_nr; i++) {
if (istate->cache[i]->ce_flags & CE_FSMONITOR_VALID) {
is_cache_changed = 1;
@@ -330,7 +350,10 @@ void refresh_fsmonitor(struct index_state *istate)
}
}
- /* If we're going to check every file, ensure we save the results */
+ /*
+ * If we're going to check every file, ensure we save
+ * the results.
+ */
if (is_cache_changed)
istate->cache_changed |= FSMONITOR_CHANGED;