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Commit 0e1dfc66 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
Browse files

[PATCH] invalidate_bdev() speedup 



We can immediately bail 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: default avatarJes Sorensen <jes@sgi.com>
Cc: <stable@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent a268cefe

fs/buffer.c

+6 −1
Original line number Diff line number Diff line
@@ -470,13 +470,18 @@ 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);

}



/*