LU-3416 llite: reset writeback index in ll_writepages

Otherwise after one round the writeback index will become beyond
the file size and ->writepages() turns into an empty operation.

Also, a safety guard is added to limit the wait time for grant to
10 minutes(take recovery into consideration) at maximum in the
osc_enter_cache() function. Otherwise, EDQUOT will be returned to
the applications to start sync write.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Change-Id: I2b20296e80a6d2a4034be8cf17129bc17780b847
Reviewed-on: http://review.whamcloud.com/6554
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>

diff --git a/lustre/llite/rw.c b/lustre/llite/rw.c
index 7e1e29d..397456a 100644 (file)
--- a/lustre/llite/rw.c
+++ b/lustre/llite/rw.c
@@ -1278,8 +1278,9 @@ int ll_writepages(struct address_space *mapping, struct writeback_control *wbc)
 
        if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) {
                if (end == OBD_OBJECT_EOF)
-                       end = i_size_read(inode);
-               mapping->writeback_index = (end >> PAGE_CACHE_SHIFT) + 1;
+                       mapping->writeback_index = 0;
+               else
+                       mapping->writeback_index = (end >> PAGE_CACHE_SHIFT) +1;
        }
        RETURN(result);
 }

diff --git a/lustre/osc/osc_cache.c b/lustre/osc/osc_cache.c
index 4e7c535..bd7a674 100644 (file)
--- a/lustre/osc/osc_cache.c
+++ b/lustre/osc/osc_cache.c
@@ -1309,15 +1309,19 @@ static int osc_completion(const struct lu_env *env, struct osc_async_page *oap,
        RETURN(0);
 }
 
-#define OSC_DUMP_GRANT(cli, fmt, args...) do {                               \
+#define OSC_DUMP_GRANT(lvl, cli, fmt, args...) do {                          \
        struct client_obd *__tmp = (cli);                                     \
-       CDEBUG(D_CACHE, "%s: { dirty: %ld/%ld dirty_pages: %d/%d "            \
-              "dropped: %ld avail: %ld, reserved: %ld, flight: %d } " fmt,   \
+       CDEBUG(lvl, "%s: grant { dirty: %ld/%ld dirty_pages: %d/%d "          \
+              "dropped: %ld avail: %ld, reserved: %ld, flight: %d } "        \
+              "lru {in list: %d, left: %d, waiters: %d }" fmt,               \
               __tmp->cl_import->imp_obd->obd_name,                           \
               __tmp->cl_dirty, __tmp->cl_dirty_max,                          \
               cfs_atomic_read(&obd_dirty_pages), obd_max_dirty_pages,        \
               __tmp->cl_lost_grant, __tmp->cl_avail_grant,                   \
-              __tmp->cl_reserved_grant, __tmp->cl_w_in_flight, ##args);      \
+              __tmp->cl_reserved_grant, __tmp->cl_w_in_flight,               \
+              cfs_atomic_read(&__tmp->cl_lru_in_list),                       \
+              cfs_atomic_read(&__tmp->cl_lru_busy),                          \
+              cfs_atomic_read(&__tmp->cl_lru_shrinkers), ##args);            \
 } while (0)
 
 /* caller must hold loi_list_lock */
@@ -1458,7 +1462,7 @@ static int osc_enter_cache_try(struct client_obd *cli,
 {
        int rc;
 
-       OSC_DUMP_GRANT(cli, "need:%d.\n", bytes);
+       OSC_DUMP_GRANT(D_CACHE, cli, "need:%d.\n", bytes);
 
        rc = osc_reserve_grant(cli, bytes);
        if (rc < 0)
@@ -1502,11 +1506,12 @@ static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli,
        struct osc_object *osc = oap->oap_obj;
        struct lov_oinfo  *loi = osc->oo_oinfo;
        struct osc_cache_waiter ocw;
-       struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
+       struct l_wait_info lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(600), NULL,
+                                                 LWI_ON_SIGNAL_NOOP, NULL);
        int rc = -EDQUOT;
        ENTRY;
 
-       OSC_DUMP_GRANT(cli, "need:%d.\n", bytes);
+       OSC_DUMP_GRANT(D_CACHE, cli, "need:%d.\n", bytes);
 
        client_obd_list_lock(&cli->cl_loi_list_lock);
 
@@ -1544,8 +1549,15 @@ static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli,
 
                client_obd_list_lock(&cli->cl_loi_list_lock);
 
-               /* l_wait_event is interrupted by signal */
+               /* l_wait_event is interrupted by signal, or timed out */
                if (rc < 0) {
+                       if (rc == -ETIMEDOUT) {
+                               OSC_DUMP_GRANT(D_ERROR, cli,
+                                               "try to reserve %d.\n", bytes);
+                               osc_extent_tree_dump(D_ERROR, osc);
+                               rc = -EDQUOT;
+                       }
+
                        cfs_list_del_init(&ocw.ocw_entry);
                        GOTO(out, rc);
                }
@@ -1561,7 +1573,7 @@ static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli,
        EXIT;
 out:
        client_obd_list_unlock(&cli->cl_loi_list_lock);
-       OSC_DUMP_GRANT(cli, "returned %d.\n", rc);
+       OSC_DUMP_GRANT(D_CACHE, cli, "returned %d.\n", rc);
        RETURN(rc);
 }
 
@@ -2911,7 +2923,7 @@ int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj,
                        result = rc;
        }
 
-       OSC_IO_DEBUG(obj, "cache page out.\n");
+       OSC_IO_DEBUG(obj, "pageout [%lu, %lu], %d.\n", start, end, result);
        RETURN(result);
 }