Messages in this thread |  | | | Date | Thu, 25 Feb 2010 09:20:35 +0100 | | From | Jens Axboe <> | | Subject | Re: Testing for dirty buffers on a block device |
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On Wed, Feb 24 2010, Alan Stern wrote: > On Wed, 24 Feb 2010, Jens Axboe wrote: > > > > > But if you wanted, I guess the only way would be to lookup > > > > dirty/writeback pages on the bdev inode mapping. For that you'd need the > > > > bdev, not the gendisk or the queue though. > > > > > > I can get the bdev from the gendisk by calling bdget_disk() with a > > > partition number of 0, right? What would the next step be? Would this > > > check for dirty pages associated with any of the partitions or would it > > > only look at pages associated with the inode for the entire disk? > > > > It would cover the entire bdev. > > Okay, so once I've got the bdev, how do I look up the dirty/writeback > pages on the inode mapping?
I _think_ you can get away with not doing a radix lookup for dirty pages, just looking at the BDI_RECLAIMABLE stat on the bdi. That would be:
bdi_stat(bdev->bd_inode->i_mapping->backing_dev_info, BDI_RECLAIMABLE);
-- Jens Axboe
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