Nick Piggin wrote:
Eric W. Biederman wrote:
When we initialize the ramdisk by writing to /dev/ram0 usually in
init/do_mounts_rd.c we don't allocate buffer heads but we do set
the dirty bit, and the page is in the page cache. So when we
later call getblk it reuses the same page and then calls
init_page_buffers.
Hmm, so this would be a problem for block_dev.c as well, then?
Because it would be possible to have a dirty block dev page
have its buffers reclaimed and then reinitialised via
init_page_buffers, AFAIKS.
Oh, no, try_to_free_buffers won't drop dirty buffers. However we
could still set_page_dirty of a block device page without buffers
via an mmap.
--
SUSE Labs, Novell Inc.
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