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[PATCH] invalidate_bdev() speedup

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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: Jes Sorensen <jes@sgi.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andrew Morton 2006-07-30 03:03:28 -07:00 committed by Linus Torvalds
parent a268cefebc
commit 0e1dfc66b6
1 changed files with 6 additions and 1 deletions
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fs/buffer.c
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@ -470,13 +470,18 @@ __find_get_block_slow(struct block_device *bdev, sector_t block)
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);
}
/*