Please apply e1b849cfa6b61f1c866a908c9e8dd9b5aaab820b to 6.12.y

Hello,

AUTOSEL already grabbed the other two patches in this series, but this one is equally important and we're currently hitting problems in production without this patch. It applies cleanly to 6.12.y. Thanks,

Josef

Queued for 6.12.y, thanks.

Note that e1b849cfa6b6 introduced a use-after-free in inode_switch_wbs_work_fn() that was fixed later by 6689f01d6740 ("writeback: Fix use after free in inode_switch_wbs_work_fn()", which carries Fixes: e1b849cfa6b6 and Cc: stable). That fix wasn't in 6.12.y yet either, so I've queued it on top to avoid reintroducing the UAF.

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Thanks,
Sasha