Added flush_disk to factor out common buffer cache flushing code.

We need to be able to flush the buffer cache for for more than
just when a disk is changed, so we factor out common cache flush code
in check_disk_change() to an internal flush_disk() routine.  This
routine will then be used for both disk changes and disk resizes (in a
later patch).

Include the disk name in the text indicating that there are busy
inodes on the device and increase the KERN severity of the message.

Signed-off-by: Andrew Patterson <andrew.patterson@hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 27 insertions, 5 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index b721955d382e..33650fc537c4 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -853,6 +853,32 @@ struct block_device *open_by_devnum(dev_t dev, unsigned mode)
 EXPORT_SYMBOL(open_by_devnum);
 
 /**
+ * flush_disk - invalidates all buffer-cache entries on a disk
+ *
+ * @bdev:      struct block device to be flushed
+ *
+ * Invalidates all buffer-cache entries on a disk. It should be called
+ * when a disk has been changed -- either by a media change or online
+ * resize.
+ */
+static void flush_disk(struct block_device *bdev)
+{
+        if (__invalidate_device(bdev)) {
+                char name[BDEVNAME_SIZE] = "";
+
+                if (bdev->bd_disk)
+                        disk_name(bdev->bd_disk, 0, name);
+                printk(KERN_WARNING "VFS: busy inodes on changed media or "
+                       "resized disk %s\n", name);
+        }
+
+        if (!bdev->bd_disk)
+                return;
+        if (disk_partitionable(bdev->bd_disk))
+                bdev->bd_invalidated = 1;
+}
+
+/**
  * check_disk_size_change - checks for disk size change and adjusts
  *                          bdev size.
  *
@@ -929,13 +955,9 @@ int check_disk_change(struct block_device *bdev)
         if (!bdops->media_changed(bdev->bd_disk))
                 return 0;
 
-        if (__invalidate_device(bdev))
-                printk("VFS: busy inodes on changed media.\n");
-
+        flush_disk(bdev);
         if (bdops->revalidate_disk)
                 bdops->revalidate_disk(bdev->bd_disk);
-        if (disk_partitionable(bdev->bd_disk))
-                bdev->bd_invalidated = 1;
         return 1;
 }