From e1dfb0e413bba805ae588e60a77ce278df047ab6 Mon Sep 17 00:00:00 2001
From: alex <alex>
Date: Sun, 14 Aug 2005 14:44:59 +0000
Subject: [PATCH] - per-inode wait queue to wait for I/O completion - never
 leave non-handled close works (in close thread)

---
 lustre/include/linux/lustre_lite.h |  2 ++
 lustre/llite/llite_close.c         | 13 +++++++++----
 lustre/llite/llite_internal.h      |  1 +
 lustre/llite/llite_lib.c           |  2 ++
 4 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/lustre/include/linux/lustre_lite.h b/lustre/include/linux/lustre_lite.h
index 41c5bb0..3d2c640 100644
--- a/lustre/include/linux/lustre_lite.h
+++ b/lustre/include/linux/lustre_lite.h
@@ -121,6 +121,8 @@ struct ll_inode_info {
         struct lustre_key      *lli_key_info;
 
         struct lustre_capa     *lli_trunc_capa; /* capabiliity for truncate */
+
+        wait_queue_head_t       lli_dirty_wait;
 };
 
 // FIXME: replace the name of this with LL_I to conform to kernel stuff
diff --git a/lustre/llite/llite_close.c b/lustre/llite/llite_close.c
index 31ac436..954f448 100644
--- a/lustre/llite/llite_close.c
+++ b/lustre/llite/llite_close.c
@@ -52,6 +52,8 @@ void llap_write_complete(struct inode *inode, struct ll_async_page *llap)
         spin_lock(&lli->lli_lock);
         if (!list_empty(&llap->llap_pending_write))
                 list_del_init(&llap->llap_pending_write);
+        if (list_empty(&lli->lli_pending_write_llaps))
+                wake_up(&lli->lli_dirty_wait);
         spin_unlock(&lli->lli_lock);
 }
 
@@ -148,12 +150,14 @@ static struct ll_inode_info *ll_close_next_lli(struct ll_close_queue *lcq)
 
         spin_lock(&lcq->lcq_lock);
 
-        if (lcq->lcq_list.next == NULL)
-                lli = ERR_PTR(-1);
-        else if (!list_empty(&lcq->lcq_list)) {
+        /* first, check for queued request. otherwise, we would
+         * leak them upon umount */
+        if (!list_empty(&lcq->lcq_list)) {
                 lli = list_entry(lcq->lcq_list.next, struct ll_inode_info,
                                  lli_close_item);
                 list_del_init(&lli->lli_close_item);
+        } else if (lcq->lcq_stop != 0) {
+                lli = ERR_PTR(-1);
         }
 
         spin_unlock(&lcq->lcq_lock);
@@ -210,6 +214,7 @@ int ll_close_thread_start(struct ll_close_queue **lcq_ret)
         if (lcq == NULL)
                 return -ENOMEM;
 
+        lcq->lcq_stop = 0;
         spin_lock_init(&lcq->lcq_lock);
         INIT_LIST_HEAD(&lcq->lcq_list);
         init_waitqueue_head(&lcq->lcq_waitq);
@@ -229,7 +234,7 @@ int ll_close_thread_start(struct ll_close_queue **lcq_ret)
 void ll_close_thread_stop(struct ll_close_queue *lcq)
 {
         init_completion(&lcq->lcq_comp);
-        lcq->lcq_list.next = NULL;
+        lcq->lcq_stop = 1;
         wake_up(&lcq->lcq_waitq);
         wait_for_completion(&lcq->lcq_comp);
         OBD_FREE(lcq, sizeof(*lcq));
diff --git a/lustre/llite/llite_internal.h b/lustre/llite/llite_internal.h
index c8144a8..1826223 100644
--- a/lustre/llite/llite_internal.h
+++ b/lustre/llite/llite_internal.h
@@ -451,6 +451,7 @@ struct ll_close_queue {
         struct list_head        lcq_list;
         wait_queue_head_t       lcq_waitq;
         struct completion       lcq_comp;
+        int                     lcq_stop;
 };
 
 void llap_write_pending(struct inode *inode, struct ll_async_page *llap);
diff --git a/lustre/llite/llite_lib.c b/lustre/llite/llite_lib.c
index b91d365..3a0057a 100644
--- a/lustre/llite/llite_lib.c
+++ b/lustre/llite/llite_lib.c
@@ -582,6 +582,7 @@ void ll_lli_init(struct ll_inode_info *lli)
         lli->lli_open_fd_exec_count = 0;
         lli->lli_audit_mask = AUDIT_OFF;
         lli->lli_key_info = NULL;
+        init_waitqueue_head(&lli->lli_dirty_wait);
 }
 
 int ll_fill_super(struct super_block *sb, void *data, int silent)
@@ -1158,6 +1159,7 @@ void ll_clear_inode(struct inode *inode)
         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n", inode->i_ino,
                inode->i_generation, inode);
 
+        LASSERT(ll_is_inode_dirty(inode) == 0);
         ll_inode2id(&id, inode);
         
         clear_bit(LLI_F_HAVE_MDS_SIZE_LOCK, &(ll_i2info(inode)->lli_flags));
-- 
1.8.3.1