http://bugzilla.kernel.org/show_bug.cgi?id=11688
------- Comment #9 from [email protected] 2009-01-20 09:18 -------
Ted, I've looked into this and it is a bug in ext4. It should call
grab_cache_page_write_begin() with AOP_FLAG_NOFS since it cannot handle
recursion into the filesystem for freeing memory. The problem is that at the
time grab_cache_page_write_begin() is called, a transaction is already started
- this is what quota code complains about (because it also needs to start a
transaction but current->journal_info is already occupied by ext4).
If we wanted to avoid AOP_FLAG_NOFS we could get the page, start a transaction,
lock and check the page but that's going to be a bit nasty.
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