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-rw-r--r--fs/ocfs2/dcache.c42
1 files changed, 39 insertions, 3 deletions
diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c
index b1cc7c381e88..e9d7c2038c0f 100644
--- a/fs/ocfs2/dcache.c
+++ b/fs/ocfs2/dcache.c
@@ -38,6 +38,7 @@
#include "dlmglue.h"
#include "file.h"
#include "inode.h"
+#include "super.h"
static int ocfs2_dentry_revalidate(struct dentry *dentry,
@@ -294,6 +295,34 @@ out_attach:
return ret;
}
+static DEFINE_SPINLOCK(dentry_list_lock);
+
+/* We limit the number of dentry locks to drop in one go. We have
+ * this limit so that we don't starve other users of ocfs2_wq. */
+#define DL_INODE_DROP_COUNT 64
+
+/* Drop inode references from dentry locks */
+void ocfs2_drop_dl_inodes(struct work_struct *work)
+{
+ struct ocfs2_super *osb = container_of(work, struct ocfs2_super,
+ dentry_lock_work);
+ struct ocfs2_dentry_lock *dl;
+ int drop_count = DL_INODE_DROP_COUNT;
+
+ spin_lock(&dentry_list_lock);
+ while (osb->dentry_lock_list && drop_count--) {
+ dl = osb->dentry_lock_list;
+ osb->dentry_lock_list = dl->dl_next;
+ spin_unlock(&dentry_list_lock);
+ iput(dl->dl_inode);
+ kfree(dl);
+ spin_lock(&dentry_list_lock);
+ }
+ if (osb->dentry_lock_list)
+ queue_work(ocfs2_wq, &osb->dentry_lock_work);
+ spin_unlock(&dentry_list_lock);
+}
+
/*
* ocfs2_dentry_iput() and friends.
*
@@ -318,16 +347,23 @@ out_attach:
static void ocfs2_drop_dentry_lock(struct ocfs2_super *osb,
struct ocfs2_dentry_lock *dl)
{
- iput(dl->dl_inode);
ocfs2_simple_drop_lockres(osb, &dl->dl_lockres);
ocfs2_lock_res_free(&dl->dl_lockres);
- kfree(dl);
+
+ /* We leave dropping of inode reference to ocfs2_wq as that can
+ * possibly lead to inode deletion which gets tricky */
+ spin_lock(&dentry_list_lock);
+ if (!osb->dentry_lock_list)
+ queue_work(ocfs2_wq, &osb->dentry_lock_work);
+ dl->dl_next = osb->dentry_lock_list;
+ osb->dentry_lock_list = dl;
+ spin_unlock(&dentry_list_lock);
}
void ocfs2_dentry_lock_put(struct ocfs2_super *osb,
struct ocfs2_dentry_lock *dl)
{
- int unlock = 0;
+ int unlock;
BUG_ON(dl->dl_count == 0);
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