Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 31 Aug 2020 18:42:19 +0100 | From | Matthew Wilcox <> | Subject | Re: [PATCH v3] iomap: Fix WARN_ON_ONCE() from unprivileged users |
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On Mon, Aug 31, 2020 at 01:25:34PM -0400, Qian Cai wrote: > + case IOMAP_DELALLOC: > + /* > + * DIO is not serialised against mmap() access at all, and so > + * if the page_mkwrite occurs between the writeback and the > + * iomap_apply() call in the DIO path, then it will see the > + * DELALLOC block that the page-mkwrite allocated. > + */ > + path = file_path(dio->iocb->ki_filp, pathname, > + sizeof(pathname)); > + if (IS_ERR(path)) > + path = "(unknown)"; > + > + pr_warn_ratelimited("Direct I/O collision with buffered writes! File: %s Comm: %.20s\n", > + path, current->comm);
"File: %pD4"?
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