[PATCH 4/5] Added flush_disk to factor out common buffer cache flushing code.

Andrew Patterson
2008-05-08T06:32:22Z

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>
---

fs/block_dev.c | 33 ++++++++++++++++++++++++++++-----
1 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 87014e6..eb2bc5c 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -867,6 +867,33 @@ 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 %s\n",
+ name);
+ }
+
+ if (!bdev->bd_disk)
+ return;
+ if (bdev->bd_disk->minors > 1)
+ bdev->bd_invalidated = 1;
+}
+
/**
* revalidate_disk - wrapper for lower-level driver's revalidate_disk
* call-back
@@ -928,13 +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 (bdev->bd_disk->minors > 1)
- bdev->bd_invalidated = 1;
return 1;
}