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-rw-r--r--xlators/features/metadisp/src/metadisp-unlink.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/xlators/features/metadisp/src/metadisp-unlink.c b/xlators/features/metadisp/src/metadisp-unlink.c
new file mode 100644
index 0000000..1f6a8eb
--- /dev/null
+++ b/xlators/features/metadisp/src/metadisp-unlink.c
@@ -0,0 +1,160 @@
+
+#include "metadisp.h"
+#include <glusterfs/call-stub.h>
+
+/**
+ * The unlink flow in metadisp is complicated because we must
+ * do ensure that UNLINK causes both the metadata objects
+ * to get removed and the data objects to get removed.
+ */
+
+int32_t
+metadisp_unlink_resume(call_frame_t *frame, xlator_t *this, loc_t *loc,
+ int xflag, dict_t *xdata)
+{
+ METADISP_TRACE("winding backend unlink to path %s", loc->path);
+ STACK_WIND(frame, default_unlink_cbk, DATA_CHILD(this),
+ DATA_CHILD(this)->fops->unlink, loc, xflag, xdata);
+ return 0;
+}
+
+int32_t
+metadisp_unlink_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, struct iatt *preparent,
+ struct iatt *postparent, dict_t *xdata)
+{
+ METADISP_TRACE(". %d %d", op_ret, op_errno);
+
+ int ret = 0;
+ call_stub_t *stub = NULL;
+ int nlink = 0;
+
+ if (cookie) {
+ stub = cookie;
+ }
+
+ if (op_ret != 0) {
+ goto unwind;
+ }
+
+ if (stub->poison) {
+ call_stub_destroy(stub);
+ stub = NULL;
+ return 0;
+ }
+
+ ret = dict_get_uint32(xdata, GF_RESPONSE_LINK_COUNT_XDATA, &nlink);
+ if (ret != 0) {
+ op_errno = EINVAL;
+ op_ret = -1;
+ goto unwind;
+ }
+ METADISP_TRACE("frontend hardlink count %d %d", ret, nlink);
+ if (nlink > 1) {
+ goto unwind;
+ }
+
+ call_resume(stub);
+ return 0;
+
+unwind:
+ if (stub) {
+ call_stub_destroy(stub);
+ }
+ STACK_UNWIND_STRICT(unlink, frame, op_ret, op_errno, preparent, postparent,
+ xdata);
+ return 0;
+}
+
+int32_t
+metadisp_unlink_lookup_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, inode_t *inode,
+ struct iatt *buf, dict_t *xdata,
+ struct iatt *postparent)
+{
+ call_stub_t *stub = NULL;
+
+ if (cookie) {
+ stub = cookie;
+ }
+
+ if (op_ret != 0) {
+ goto unwind;
+ }
+
+ // fail fast on empty gfid so we don't loop forever
+ if (gf_uuid_is_null(buf->ia_gfid)) {
+ op_ret = -1;
+ op_errno = ENODATA;
+ goto unwind;
+ }
+
+ // fill gfid since the stub is incomplete
+ memcpy(stub->args.loc.gfid, buf->ia_gfid, sizeof(uuid_t));
+ memcpy(stub->args.loc.pargfid, postparent->ia_gfid, sizeof(uuid_t));
+
+ if (stub->poison) {
+ call_stub_destroy(stub);
+ stub = NULL;
+ return 0;
+ }
+
+ call_resume(stub);
+ return 0;
+
+unwind:
+ if (stub) {
+ call_stub_destroy(stub);
+ }
+ STACK_UNWIND_STRICT(unlink, frame, op_ret, op_errno, NULL, NULL, NULL);
+ return 0;
+}
+
+int32_t
+metadisp_unlink(call_frame_t *frame, xlator_t *this, loc_t *loc, int xflag,
+ dict_t *xdata)
+{
+ call_stub_t *stub = NULL;
+ loc_t backend_loc = {
+ 0,
+ };
+
+ if (gf_uuid_is_null(loc->gfid)) {
+ METADISP_TRACE("winding lookup for unlink to path %s", loc->path);
+
+ // loop back to ourselves after a lookup
+ stub = fop_unlink_stub(frame, metadisp_unlink, loc, xflag, xdata);
+ STACK_WIND_COOKIE(frame, metadisp_unlink_lookup_cbk, stub,
+ METADATA_CHILD(this),
+ METADATA_CHILD(this)->fops->lookup, loc, xdata);
+ return 0;
+ }
+
+ if (build_backend_loc(loc->gfid, loc, &backend_loc)) {
+ goto unwind;
+ }
+
+ //
+ // ensure we get the link count on the unlink response, so we can
+ // account for hardlinks before winding to the backend.
+ // NOTE:
+ // multiple xlators use GF_REQUEST_LINK_COUNT_XDATA. confirmation
+ // is needed to ensure that multiple requests will work in the same
+ // xlator stack.
+ //
+ if (!xdata) {
+ xdata = dict_new();
+ }
+ dict_set_int32(xdata, GF_REQUEST_LINK_COUNT_XDATA, 1);
+
+ METADISP_TRACE("winding frontend unlink to path %s", loc->path);
+ stub = fop_unlink_stub(frame, metadisp_unlink_resume, &backend_loc, xflag,
+ xdata);
+
+ STACK_WIND_COOKIE(frame, metadisp_unlink_cbk, stub, METADATA_CHILD(this),
+ METADATA_CHILD(this)->fops->unlink, loc, xflag, xdata);
+ return 0;
+unwind:
+ STACK_UNWIND_STRICT(unlink, frame, -1, EINVAL, NULL, NULL, NULL);
+ return 0;
+}