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Btrfs: fix to search one more bitmap for cluster setup
Suppose there are two bitmaps [0, 256], [256, 512] and one extent [100, 120] in the free space cache, and we want to setup a cluster with offset=100, bytes=50. In this case, there will be only one bitmap [256, 512] in the temporary bitmaps list, and then setup_cluster_bitmap() won't search bitmap [0, 256]. The cause is, the list is constructed in setup_cluster_no_bitmap(), and only bitmaps with bitmap_entry->offset >= offset will be added into the list, and the very bitmap that convers offset has bitmap_entry->offset <= offset. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -2453,10 +2453,22 @@ setup_cluster_bitmap(struct btrfs_block_group_cache *block_group,
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struct btrfs_free_space *entry;
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struct rb_node *node;
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int ret = -ENOSPC;
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u64 bitmap_offset = offset_to_bitmap(ctl, offset);
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if (ctl->total_bitmaps == 0)
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return -ENOSPC;
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/*
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* The bitmap that covers offset won't be in the list unless offset
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* is just its start offset.
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*/
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entry = list_first_entry(bitmaps, struct btrfs_free_space, list);
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if (entry->offset != bitmap_offset) {
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entry = tree_search_offset(ctl, bitmap_offset, 1, 0);
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if (entry && list_empty(&entry->list))
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list_add(&entry->list, bitmaps);
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}
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/*
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* First check our cached list of bitmaps and see if there is an entry
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* here that will work.
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