Branch HEAD

b=20098

reverting

diff --git a/lustre/include/obd.h b/lustre/include/obd.h
index 73a01f0..2f7e2bf 100644 (file)
--- a/lustre/include/obd.h
+++ b/lustre/include/obd.h
@@ -1484,7 +1484,6 @@ struct md_open_data {
         struct obd_client_handle *mod_och;
         struct ptlrpc_request    *mod_open_req;
         struct ptlrpc_request    *mod_close_req;
-        atomic_t                  mod_refcount;
 };
 
 struct lookup_intent;
@@ -1672,21 +1671,4 @@ static inline struct lustre_capa *oinfo_capa(struct obd_info *oinfo)
         return oinfo->oi_capa;
 }
 
-static inline struct md_open_data *obd_mod_alloc(void)
-{
-        struct md_open_data *mod;
-        OBD_ALLOC_PTR(mod);
-        if (mod == NULL)
-                return NULL;
-        atomic_set(&mod->mod_refcount, 1);
-        return mod;
-}
-
-#define obd_mod_get(mod) atomic_inc(&mod->mod_refcount)
-#define obd_mod_put(mod)                                \
-({                                                      \
-        if (atomic_dec_and_test(&mod->mod_refcount))    \
-                OBD_FREE_PTR(mod);                      \
-})
-
 #endif /* __OBD_H */

diff --git a/lustre/mdc/mdc_reint.c b/lustre/mdc/mdc_reint.c
index 8354bcc..58b97de 100644 (file)
--- a/lustre/mdc/mdc_reint.c
+++ b/lustre/mdc/mdc_reint.c
@@ -176,7 +176,7 @@ int mdc_setattr(struct obd_export *exp, struct md_op_data *op_data,
         {
                 LASSERT(*mod == NULL);
 
-                *mod = obd_mod_alloc();
+                OBD_ALLOC_PTR(*mod);
                 if (*mod == NULL) {
                         DEBUG_REQ(D_ERROR, req, "Can't allocate "
                                   "md_open_data");

diff --git a/lustre/mdc/mdc_request.c b/lustre/mdc/mdc_request.c
index 0708d1d..c4de6cf 100644 (file)
--- a/lustre/mdc/mdc_request.c
+++ b/lustre/mdc/mdc_request.c
@@ -678,15 +678,11 @@ void mdc_commit_open(struct ptlrpc_request *req)
         if (mod == NULL)
                 return;
 
-        /**
-         * No need to touch md_open_data::mod_och, it holds a reference on
-         * \var mod and will zero references to each other, \var mod will be
-         * freed after that when md_open_data::mod_och will put the reference.
-         */
+        if (mod->mod_och != NULL)
+                mod->mod_och->och_mod = NULL;
 
+        OBD_FREE(mod, sizeof(*mod));
         req->rq_cb_data = NULL;
-        mod->mod_open_req = NULL;
-        obd_mod_put(mod);
 }
 
 int mdc_set_open_replay_data(struct obd_export *exp,
@@ -711,7 +707,7 @@ int mdc_set_open_replay_data(struct obd_export *exp,
 
         /* Only if the import is replayable, we set replay_open data */
         if (och && imp->imp_replayable) {
-                mod = obd_mod_alloc();
+                OBD_ALLOC_PTR(mod);
                 if (mod == NULL) {
                         DEBUG_REQ(D_ERROR, open_req,
                                   "Can't allocate md_open_data");
@@ -721,7 +717,6 @@ int mdc_set_open_replay_data(struct obd_export *exp,
                 spin_lock(&open_req->rq_lock);
                 och->och_mod = mod;
                 mod->mod_och = och;
-                obd_mod_get(mod);
                 mod->mod_open_req = open_req;
                 open_req->rq_cb_data = mod;
                 open_req->rq_commit_cb = mdc_commit_open;
@@ -748,12 +743,17 @@ int mdc_clear_open_replay_data(struct obd_export *exp,
         struct md_open_data *mod = och->och_mod;
         ENTRY;
 
-        LASSERT(mod != LP_POISON && mod != NULL);
+        /*
+         * Don't free the structure now (it happens in mdc_commit_open(), after
+         * we're sure we won't need to fix up the close request in the future),
+         * but make sure that replay doesn't poke at the och, which is about to
+         * be freed.
+         */
+        LASSERT(mod != LP_POISON);
+        if (mod != NULL)
+                mod->mod_och = NULL;
 
-        mod->mod_och = NULL;
         och->och_mod = NULL;
-        obd_mod_put(mod);
-
         RETURN(0);
 }
 
@@ -790,8 +790,6 @@ int mdc_close(struct obd_export *exp, struct md_op_data *op_data,
                          "POISONED open %p!\n", mod->mod_open_req);
 
                 mod->mod_close_req = req;
-                obd_mod_get(mod);
-
                 DEBUG_REQ(D_HA, mod->mod_open_req, "matched open");
                 /* We no longer want to preserve this open for replay even
                  * though the open was committed. b=3632, b=3633 */
@@ -843,13 +841,9 @@ int mdc_close(struct obd_export *exp, struct md_op_data *op_data,
                         rc = 0;
         }
 
-        if (mod) {
-                if (rc != 0)
-                        mod->mod_close_req = NULL;
-                /* Since now, mod is accessed through open_req only,
-                 * thus close req does not keep a reference on mod anymore. */
-                obd_mod_put(mod);
-        }
+        if (rc != 0 && mod)
+                 mod->mod_close_req = NULL;
+
         *request = req;
         RETURN(rc);
 }
@@ -879,7 +873,6 @@ int mdc_done_writing(struct obd_export *exp, struct md_op_data *op_data,
                          "POISONED setattr %p!\n", mod->mod_open_req);
 
                 mod->mod_close_req = req;
-                obd_mod_get(mod);
                 DEBUG_REQ(D_HA, mod->mod_open_req, "matched setattr");
                 /* We no longer want to preserve this setattr for replay even
                  * though the open was committed. b=3632, b=3633 */
@@ -905,13 +898,6 @@ int mdc_done_writing(struct obd_export *exp, struct md_op_data *op_data,
                         rc = 0;
         }
 
-        if (mod) {
-                if (rc != 0)
-                        mod->mod_close_req = NULL;
-                /* Since now, mod is accessed through setattr req only,
-                 * thus DW req does not keep a reference on mod anymore. */
-                obd_mod_put(mod);
-        }
         ptlrpc_req_finished(req);
         RETURN(rc);
 }
@@ -1451,7 +1437,7 @@ static int mdc_pin(struct obd_export *exp, const struct lu_fid *fid,
         handle->och_fh = body->handle;
         handle->och_magic = OBD_CLIENT_HANDLE_MAGIC;
 
-        handle->och_mod = obd_mod_alloc();
+        OBD_ALLOC_PTR(handle->och_mod);
         if (handle->och_mod == NULL) {
                 DEBUG_REQ(D_ERROR, req, "can't allocate md_open_data");
                 GOTO(err_out, rc = -ENOMEM);
@@ -1494,7 +1480,7 @@ static int mdc_unpin(struct obd_export *exp, struct obd_client_handle *handle,
         ptlrpc_req_finished(req);
         ptlrpc_req_finished(handle->och_mod->mod_open_req);
 
-        obd_mod_put(handle->och_mod);
+        OBD_FREE(handle->och_mod, sizeof(*handle->och_mod));
         RETURN(rc);
 }