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Eric Biggers authored
When writing a page from an encrypted file that is using filesystem-layer encryption (not inline encryption), ext4 encrypts the pagecache page into a bounce page, then writes the bounce page. It also passes the bounce page to wbc_account_cgroup_owner(). That's incorrect, because the bounce page is a newly allocated temporary page that doesn't have the memory cgroup of the original pagecache page. This makes wbc_account_cgroup_owner() not account the I/O to the owner of the pagecache page as it should. Fix this by always passing the pagecache page to wbc_account_cgroup_owner(). Fixes: 001e4a87 ("ext4: implement cgroup writeback support") Cc: stable@vger.kernel.org Reported-by:
Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by:
Eric Biggers <ebiggers@google.com> Acked-by:
Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/r/20230203005503.141557-1-ebiggers@kernel.orgSigned-off-by:
Theodore Ts'o <tytso@mit.edu>
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