-stable review patch. If anyone has any objections, please let us know.
------------------
From: Andrew Morton <[email protected]>
We can immediately bale from invalidate_bdev() if the blockdev has no
pagecache.
This solves the huge IPI storms which hald is causing on the big ia64
machines when it polls CDROM drives.
Acked-by: Jes Sorensen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/buffer.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- linux-2.6.17.7.orig/fs/buffer.c
+++ linux-2.6.17.7/fs/buffer.c
@@ -473,13 +473,18 @@ out:
pass does the actual I/O. */
void invalidate_bdev(struct block_device *bdev, int destroy_dirty_buffers)
{
+ struct address_space *mapping = bdev->bd_inode->i_mapping;
+
+ if (mapping->nrpages == 0)
+ return;
+
invalidate_bh_lrus();
/*
* FIXME: what about destroy_dirty_buffers?
* We really want to use invalidate_inode_pages2() for
* that, but not until that's cleaned up.
*/
- invalidate_inode_pages(bdev->bd_inode->i_mapping);
+ invalidate_inode_pages(mapping);
}
/*
--
-
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