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Btrfs: Don't do btree balance_dirty_pages on old kernels, it stalls forever
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -1655,6 +1655,11 @@ void btrfs_throttle(struct btrfs_root *root)
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void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
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{
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/*
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* looks as though older kernels can get into trouble with
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* this code, they end up stuck in balance_dirty_pages forever
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*/
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
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struct extent_io_tree *tree;
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u64 num_dirty;
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u64 start = 0;
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@ -1670,6 +1675,9 @@ void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
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balance_dirty_pages_ratelimited_nr(
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root->fs_info->btree_inode->i_mapping, 1);
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}
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#else
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return;
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#endif
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}
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void btrfs_set_buffer_defrag(struct extent_buffer *buf)
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