[PATCH 1/2] block: fs: bd_invalidated should be cleared in revalidate_disk

From: MITSUNARI Shigeo
Date: Thu Oct 18 2012 - 23:25:00 EST

rescan_partitions() and invalidate_partitions() in block/partition-generic.c
set bdev->bd_invalidated = 0 after calling check_disk_size_change().
But revalidate_disk() in fs/block_dev.c does not clear it.

If bdev->bd_invalidated = 1 then rescan_partitions() is called when
__blkdev_get() is called.
So if revalidate_disk() is once called, all buffer cache pages will be
cleared whenever the device is opened.

This patch fixes the bug.
I add bdev->bd_invalidated = 0; after calling check_disk_size_change().

Signed-off-by: MITSUNARI Shigeo <herumi@xxxxxxxxx>
fs/block_dev.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 38e721b..2577cf4 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1047,6 +1047,7 @@ int revalidate_disk(struct gendisk *disk)

check_disk_size_change(disk, bdev);
+ bdev->bd_invalidated = 0;
return ret;

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