Messages in this thread | | | Date | Wed, 5 Feb 2003 18:35:40 -0800 | From | David Ashley <> | Subject | Re: Block device invalidate cached blocks |
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>I'm working on a block device driver for linux. > >Linux caches the blocks read from my block device, which is fine. I've >mounted a read-only filesystem on the block device. But sometimes on >the back end the file system will change. Is there a way I can cause the >kernel to just flush all its cached blocks? Or even better invalidate >just the few blocks that have changed? > >Thanks-- >Dave
After some hunting (kernel hackers guide proved fruitless, web searches were the same, looked in fs/buffer.c and found void invalidate_bdev(struct block_device *bdev, int destroy_dirty_buffers);
Found use of it in block_dev.c:
/* Kill _all_ buffers, dirty or not.. */ static void kill_bdev(struct block_device *bdev) { invalidate_bdev(bdev, 1); truncate_inode_pages(bdev->bd_inode->i_mapping, 0); }
So hopefully I can just invalidate the block device when I need to.
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