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-rw-r--r--xlators/features/metadisp/src/metadisp-readdir.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/xlators/features/metadisp/src/metadisp-readdir.c b/xlators/features/metadisp/src/metadisp-readdir.c
new file mode 100644
index 0000000..5f840b1
--- /dev/null
+++ b/xlators/features/metadisp/src/metadisp-readdir.c
@@ -0,0 +1,65 @@
+#include "metadisp.h"
+
+/**
+ * With a change to the posix xlator, readdir and readdirp are shockingly
+ * simple.
+ *
+ * The issue with separating the backend data of the files
+ * with the metadata is that readdirs must now read from multiple sources
+ * to coalesce the directory entries.
+ *
+ * The way we do this is to tell the METADATA_CHILD that when it's
+ * running readdirp, each file entry should have a stat wound to
+ * 'stat-source-of-truth'.
+ *
+ * see metadisp_stat for how it handles winds _from_posix.
+ */
+
+int32_t
+metadisp_readdir(call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
+ off_t off, dict_t *xdata)
+{
+ METADISP_TRACE(".");
+ /*
+ * Always use readdirp, even if the original was readdir. Why? Because NFS.
+ * There are multiple translations between Gluster, UNIX, and NFS stat
+ * structures in that path. One of them uses the type etc. from the stat
+ * structure, which is only filled in by readdirp. If we use readdir, the
+ * entries do actually go all the way back to the client and are visible in
+ * getdents, but then the readdir throws them away because of the
+ * uninitialized type.
+ */
+ GF_UNUSED int32_t ret;
+ if (!xdata) {
+ xdata = dict_new();
+ }
+
+ // ret = dict_set_int32 (xdata, "list-xattr", 1);
+
+ // I'm my own source of truth!
+ ret = dict_set_static_ptr(xdata, "stat-source-of-truth", (void *)this);
+
+ STACK_WIND(frame, default_readdirp_cbk, METADATA_CHILD(this),
+ METADATA_CHILD(this)->fops->readdirp, fd, size, off, xdata);
+
+ return 0;
+}
+
+int32_t
+metadisp_readdirp(call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
+ off_t off, dict_t *xdata)
+{
+ METADISP_TRACE(".");
+ if (!xdata) {
+ xdata = dict_new();
+ }
+ GF_UNUSED int32_t ret;
+ // ret = dict_set_int32 (xdata, "list-xattr", 1);
+
+ // I'm my own source of truth!
+ ret = dict_set_static_ptr(xdata, "stat-source-of-truth", (void *)this);
+
+ STACK_WIND(frame, default_readdirp_cbk, METADATA_CHILD(this),
+ METADATA_CHILD(this)->fops->readdirp, fd, size, off, xdata);
+ return 0;
+}