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Btrfs: do not warn_on io_ctl->cur in io_ctl_map_page
io_ctl_map_page is called by many functions in free-space-cache. In most scenarios, the ->cur is not null, e.g. io_ctl_add_entry. I think we'd better remove the warn_on here. Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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@ -307,7 +307,6 @@ static void io_ctl_unmap_page(struct io_ctl *io_ctl)
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static void io_ctl_map_page(struct io_ctl *io_ctl, int clear)
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{
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WARN_ON(io_ctl->cur);
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BUG_ON(io_ctl->index >= io_ctl->num_pages);
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io_ctl->page = io_ctl->pages[io_ctl->index++];
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io_ctl->cur = kmap(io_ctl->page);
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