forked from Minki/linux
Deal with page == NULL in the btrfs_unplug_io_fn
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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b30757178d
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38b669880d
@ -911,12 +911,40 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
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return ret;
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}
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/*
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* this unplugs every device on the box, and it is only used when page
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* is null
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*/
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static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
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{
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struct list_head *cur;
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struct btrfs_device *device;
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struct btrfs_fs_info *info;
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info = (struct btrfs_fs_info *)bdi->unplug_io_data;
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list_for_each(cur, &info->fs_devices->devices) {
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device = list_entry(cur, struct btrfs_device, dev_list);
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bdi = blk_get_backing_dev_info(device->bdev);
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if (bdi->unplug_io_fn) {
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bdi->unplug_io_fn(bdi, page);
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}
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}
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}
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void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
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{
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struct inode *inode = page->mapping->host;
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struct inode *inode;
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struct extent_map_tree *em_tree;
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struct extent_map *em;
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u64 offset = page_offset(page);
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u64 offset;
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if (!page) {
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__unplug_io_fn(bdi, page);
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return;
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}
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inode = page->mapping->host;
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offset = page_offset(page);
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em_tree = &BTRFS_I(inode)->extent_tree;
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spin_lock(&em_tree->lock);
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