1 files changed, 77 insertions, 0 deletions
diff --git a/third_party/git/fsmonitor.h b/third_party/git/fsmonitor.h
new file mode 100644
index 000000000000..739318ab6d10
--- /dev/null
+++ b/third_party/git/fsmonitor.h
@@ -0,0 +1,77 @@
+#ifndef FSMONITOR_H
+#define FSMONITOR_H
+
+#include "cache.h"
+#include "dir.h"
+
+extern struct trace_key trace_fsmonitor;
+
+/*
+ * Read the fsmonitor index extension and (if configured) restore the
+ * CE_FSMONITOR_VALID state.
+ */
+int read_fsmonitor_extension(struct index_state *istate, const void *data, unsigned long sz);
+
+/*
+ * Fill the fsmonitor_dirty ewah bits with their state from the index,
+ * before it is split during writing.
+ */
+void fill_fsmonitor_bitmap(struct index_state *istate);
+
+/*
+ * Write the CE_FSMONITOR_VALID state into the fsmonitor index
+ * extension.  Reads from the fsmonitor_dirty ewah in the index.
+ */
+void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate);
+
+/*
+ * Add/remove the fsmonitor index extension
+ */
+void add_fsmonitor(struct index_state *istate);
+void remove_fsmonitor(struct index_state *istate);
+
+/*
+ * Add/remove the fsmonitor index extension as necessary based on the current
+ * core.fsmonitor setting.
+ */
+void tweak_fsmonitor(struct index_state *istate);
+
+/*
+ * Run the configured fsmonitor integration script and clear the
+ * CE_FSMONITOR_VALID bit for any files returned as dirty.  Also invalidate
+ * any corresponding untracked cache directory structures. Optimized to only
+ * run the first time it is called.
+ */
+void refresh_fsmonitor(struct index_state *istate);
+
+/*
+ * Set the given cache entries CE_FSMONITOR_VALID bit. This should be
+ * called any time the cache entry has been updated to reflect the
+ * current state of the file on disk.
+ */
+static inline void mark_fsmonitor_valid(struct index_state *istate, struct cache_entry *ce)
+{
+	if (core_fsmonitor && !(ce->ce_flags & CE_FSMONITOR_VALID)) {
+		istate->cache_changed = 1;
+		ce->ce_flags |= CE_FSMONITOR_VALID;
+		trace_printf_key(&trace_fsmonitor, "mark_fsmonitor_clean '%s'", ce->name);
+	}
+}
+
+/*
+ * Clear the given cache entry's CE_FSMONITOR_VALID bit and invalidate
+ * any corresponding untracked cache directory structures. This should
+ * be called any time git creates or modifies a file that should
+ * trigger an lstat() or invalidate the untracked cache for the
+ * corresponding directory
+ */
+static inline void mark_fsmonitor_invalid(struct index_state *istate, struct cache_entry *ce)
+{
+	if (core_fsmonitor) {
+		ce->ce_flags &= ~CE_FSMONITOR_VALID;
+		untracked_cache_invalidate_path(istate, ce->name, 1);
+		trace_printf_key(&trace_fsmonitor, "mark_fsmonitor_invalid '%s'", ce->name);
+	}
+}
+
+#endif