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Date: Mon, 19 Oct 2009 16:38:06 +0800 From: Peng Tao <lkml.bergwolf@...il.com> To: Trond Myklebust <trond.myklebust@....uio.no> Cc: linux-kernel@...r.kernel.org Subject: Re: Question about invalidate_inode_pages2_range() On Mon, Oct 19, 2009 at 4:26 PM, Trond Myklebust <trond.myklebust@....uio.no> wrote: > On Mon, 2009-10-19 at 16:16 +0800, Peng Tao wrote: >> Hi, >> >> I've a question about invalidate_inode_pages2_range(). >> >> When does invalidate_inode_pages2_range() returns -EBUSY? It locks and >> writes back the page. Why invalidate_complete_page2() still may fail >> due to page dirtiness? > > A lot of those requirements were set by NFS, which uses > invalidate_inode_pages2() in order to invalidate the page cache when it > detects that a file has been changed on the server (either due to an > O_DIRECT write, or due to another client modifying the file). > > In such cases, you want to try to keep the dirty data by writing it out > instead of discarding it. Thanks for your quick response. But I have two more questions about this. 1. invalidate_inode_pages2_range() calls wait_on_page_writeback(). Does the latter actually write out the dirty page? 2. Is there any interface in the mm subsystem forces discarding a page cache? Cheers, Peng Tao -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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