X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=ldiskfs%2Fkernel_patches%2Fpatches%2Frhel7.4%2Fext4-pdirop.patch;h=910a495b4dc713f5effc33a3253b5f8044217b19;hp=72788c86564dc0e6deee2c8cdd6ae7057761e404;hb=892f62c7a20d87954744c6c8937960379a870992;hpb=3e9fedfa7ea52a03a1975572ab37cc1ae9344a8a

diff --git a/ldiskfs/kernel_patches/patches/rhel7.4/ext4-pdirop.patch b/ldiskfs/kernel_patches/patches/rhel7.4/ext4-pdirop.patch
index 72788c8..910a495 100644
--- a/ldiskfs/kernel_patches/patches/rhel7.4/ext4-pdirop.patch
+++ b/ldiskfs/kernel_patches/patches/rhel7.4/ext4-pdirop.patch
@@ -9,7 +9,7 @@ an entire ldiskfs directory. PDO project will remove this
 bottleneck by introducing a parallel locking mechanism for entire
 ldiskfs directories. This work will enable multiple application
 threads to simultaneously lookup, create and unlink in parallel.
-    
+
 This patch contains:
  - pdirops support for ldiskfs
  - integrate with osd-ldiskfs
@@ -210,7 +210,7 @@ Index: linux-3.10.0-229.1.2.fc21.x86_64/fs/ext4/htree_lock.c
 ===================================================================
 --- /dev/null
 +++ linux-3.10.0-229.1.2.fc21.x86_64/fs/ext4/htree_lock.c
-@@ -0,0 +1,880 @@
+@@ -0,0 +1,891 @@
 +/*
 + * fs/ext4/htree_lock.c
 + *
@@ -852,12 +852,23 @@ Index: linux-3.10.0-229.1.2.fc21.x86_64/fs/ext4/htree_lock.c
 +		lck->lk_task = current;
 +		list_add_tail(&lck->lk_blocked_list, &lhead->lh_blocked_list);
 +
++retry:
 +		set_current_state(TASK_UNINTERRUPTIBLE);
 +		htree_spin_unlock(lhead, HTREE_DEP_ROOT);
 +		/* wait to be given the lock */
 +		if (lck->lk_task != NULL)
 +			schedule();
-+		/* granted, no doubt. wake up will set me RUNNING */
++		/* granted, no doubt. wake up will set me RUNNING.
++		 * Since thread would be waken up accidentally,
++		 * so we need check lock whether granted or not again. */
++		if (!list_empty(&lck->lk_blocked_list)) {
++			htree_spin_lock(lhead, HTREE_DEP_ROOT);
++			if (list_empty(&lck->lk_blocked_list)) {
++				htree_spin_unlock(lhead, HTREE_DEP_ROOT);
++				return 0;
++			}
++			goto retry;
++		}
 +		return 0; /* without lh_lock */
 +	}
 +	lhead->lh_ngranted[lck->lk_mode]++;