Andrew Morton wrote:
On Thu, 12 Oct 2006 09:57:26 +0400
Dmitriy Monakhov <[email protected]> wrote:
While reading Andrew's generic_file_buffered_write patches i've remembered
one more EXT3 issue.journal_start() in prepare_write() causes different ranking
violations if copy_from_user() triggers a page fault. It could cause
GFP_FS allocation, re-entering into ext3 code possibly with a different
superblock and journal, ranking violation of journalling serialization
and mmap_sem and page lock and all other kinds of funny consequences.
With the stuff Nick and I are looking at, we won't take pagefaults inside
prepare_write()/commit_write() any more.
Yep. Because the page is locked, it is too much to deal with even
without a filesystem in the picture.
--
SUSE Labs, Novell Inc.
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