KVM: MMU: invalidate and flush on spte small->large page size change

[safe/jmp/linux-2.6] / fs / fs-writeback.c

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 24e85ce..1d1088f 100644 (file)
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -398,11 +398,11 @@ static void inode_wait_for_writeback(struct inode *inode)
        wait_queue_head_t *wqh;
 
        wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
-       do {
+        while (inode->i_state & I_SYNC) {
                spin_unlock(&inode_lock);
                __wait_on_bit(wqh, &wq, inode_wait, TASK_UNINTERRUPTIBLE);
                spin_lock(&inode_lock);
-       } while (inode->i_state & I_SYNC);
+       }
 }
 
 /*
@@ -452,11 +452,9 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
 
        BUG_ON(inode->i_state & I_SYNC);
 
-       /* Set I_SYNC, reset I_DIRTY */
-       dirty = inode->i_state & I_DIRTY;
+       /* Set I_SYNC, reset I_DIRTY_PAGES */
        inode->i_state |= I_SYNC;
-       inode->i_state &= ~I_DIRTY;
-
+       inode->i_state &= ~I_DIRTY_PAGES;
        spin_unlock(&inode_lock);
 
        ret = do_writepages(mapping, wbc);
@@ -472,6 +470,15 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
                        ret = err;
        }
 
+       /*
+        * Some filesystems may redirty the inode during the writeback
+        * due to delalloc, clear dirty metadata flags right before
+        * write_inode()
+        */
+       spin_lock(&inode_lock);
+       dirty = inode->i_state & I_DIRTY;
+       inode->i_state &= ~(I_DIRTY_SYNC | I_DIRTY_DATASYNC);
+       spin_unlock(&inode_lock);
        /* Don't write the inode if only I_DIRTY_PAGES was set */
        if (dirty & (I_DIRTY_SYNC | I_DIRTY_DATASYNC)) {
                int err = write_inode(inode, wbc);
@@ -852,6 +859,12 @@ static long wb_check_old_data_flush(struct bdi_writeback *wb)
        unsigned long expired;
        long nr_pages;
 
+       /*
+        * When set to zero, disable periodic writeback
+        */
+       if (!dirty_writeback_interval)
+               return 0;
+
        expired = wb->last_old_flush +
                        msecs_to_jiffies(dirty_writeback_interval * 10);
        if (time_before(jiffies, expired))
@@ -947,8 +960,17 @@ int bdi_writeback_task(struct bdi_writeback *wb)
                                break;
                }
 
-               wait_jiffies = msecs_to_jiffies(dirty_writeback_interval * 10);
-               schedule_timeout_interruptible(wait_jiffies);
+               if (dirty_writeback_interval) {
+                       wait_jiffies = msecs_to_jiffies(dirty_writeback_interval * 10);
+                       schedule_timeout_interruptible(wait_jiffies);
+               } else {
+                       set_current_state(TASK_INTERRUPTIBLE);
+                       if (list_empty_careful(&wb->bdi->work_list) &&
+                           !kthread_should_stop())
+                               schedule();
+                       __set_current_state(TASK_RUNNING);
+               }
+
                try_to_freeze();
        }