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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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7
fs/buffer.c
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@@ -470,13 +470,18 @@ out:
pass does the actual I/O. */ pass does the actual I/O. */
void invalidate_bdev(struct block_device *bdev, int destroy_dirty_buffers) 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(); invalidate_bh_lrus();
/* /*
* FIXME: what about destroy_dirty_buffers? * FIXME: what about destroy_dirty_buffers?
* We really want to use invalidate_inode_pages2() for * We really want to use invalidate_inode_pages2() for
* that, but not until that's cleaned up. * that, but not until that's cleaned up.
*/ */
invalidate_inode_pages(bdev->bd_inode->i_mapping); invalidate_inode_pages(mapping);
} }
/* /*