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blkdev: flush disk cache on ->fsync

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Currently there is no barrier support in the block device code.  That
means we cannot guarantee any sort of data integerity when using the
block device node with dis kwrite caches enabled.  Using the raw block
device node is a typical use case for virtualization (and I assume
databases, too).  This patch changes block_fsync to issue a cache flush
and thus make fsync on block device nodes actually useful.

Note that in mainline we would also need to add such code to the
->aio_write method for O_SYNC handling, but assuming that Jan's patch
series for the O_SYNC rewrite goes in it will also call into ->fsync
for 2.6.32.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Christoph Hellwig 2009-10-29 14:14:04 +01:00 committed by Jens Axboe
parent b9d128f108
commit ab0a9735e0
1 changed files with 11 additions and 1 deletions
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12
fs/block_dev.c
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@ -405,7 +405,17 @@ static loff_t block_llseek(struct file *file, loff_t offset, int origin)
static int block_fsync(struct file *filp, struct dentry *dentry, int datasync)
{
return sync_blockdev(I_BDEV(filp->f_mapping->host));
struct block_device *bdev = I_BDEV(filp->f_mapping->host);
int error;
error = sync_blockdev(bdev);
if (error)
return error;
error = blkdev_issue_flush(bdev, NULL);
if (error == -EOPNOTSUPP)
error = 0;
return error;
}
/*