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fuse: writepage: skip already in flight
If ->writepage() tries to write back a page whose copy is still in flight, then just skip by calling redirty_page_for_writepage(). This is OK, since now ->writepage() should never be called for data integrity sync. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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@ -1591,6 +1591,18 @@ static int fuse_writepage(struct page *page, struct writeback_control *wbc)
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{
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int err;
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if (fuse_page_is_writeback(page->mapping->host, page->index)) {
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/*
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* ->writepages() should be called for sync() and friends. We
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* should only get here on direct reclaim and then we are
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* allowed to skip a page which is already in flight
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*/
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WARN_ON(wbc->sync_mode == WB_SYNC_ALL);
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redirty_page_for_writepage(wbc, page);
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return 0;
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}
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err = fuse_writepage_locked(page);
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unlock_page(page);
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