Messages in this thread | | | Date | Thu, 4 Oct 2007 14:26:41 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH 4/5] writeback: remove pages_skipped accounting in __block_write_full_page() |
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On Tue, 02 Oct 2007 16:41:47 +0800 Fengguang Wu <wfg@mail.ustc.edu.cn> wrote:
> This patch fixes this bug. Though I'm not sure why __block_write_full_page() > is called only to do nothing and who actually issued the writeback for us.
kjourald wrote the page's buffers back (ext3 in ordered-data mode). The VM didn't know about that, so we have a PageDirty page which has clean buffers.
We rely upon the VFS writeback code to "discover" that this dirty page has clean buffers: the VFS will attempt to write the dirty page and will end up marking the page clean without performing any IO.
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