Btrfs: Limit btree writeback to prevent seeks
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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Родитель
015a739c7c
Коммит
793955bca6
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@ -210,6 +210,15 @@ static int btree_writepages(struct address_space *mapping,
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{
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struct extent_map_tree *tree;
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tree = &BTRFS_I(mapping->host)->extent_tree;
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if (wbc->sync_mode == WB_SYNC_NONE) {
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u64 num_dirty;
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u64 start = 0;
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unsigned long thresh = 96 * 1024 * 1024;
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num_dirty = count_range_bits(tree, &start, thresh, EXTENT_DIRTY);
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if (num_dirty < thresh) {
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return 0;
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}
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}
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return extent_writepages(tree, mapping, btree_get_extent, wbc);
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}
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@ -1106,6 +1106,45 @@ out:
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return found;
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}
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u64 count_range_bits(struct extent_map_tree *tree,
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u64 *start, u64 max_bytes, unsigned long bits)
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{
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struct rb_node *node;
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struct extent_state *state;
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u64 cur_start = *start;
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u64 total_bytes = 0;
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int found = 0;
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write_lock_irq(&tree->lock);
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/*
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* this search will find all the extents that end after
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* our range starts.
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*/
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node = tree_search(&tree->state, cur_start);
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if (!node || IS_ERR(node)) {
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goto out;
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}
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while(1) {
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state = rb_entry(node, struct extent_state, rb_node);
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if ((state->state & bits)) {
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total_bytes += state->end - state->start + 1;
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if (total_bytes >= max_bytes)
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break;
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if (!found) {
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*start = state->start;
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found = 1;
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}
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}
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node = rb_next(node);
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if (!node)
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break;
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}
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out:
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write_unlock_irq(&tree->lock);
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return total_bytes;
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}
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/*
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* helper function to lock both pages and extents in the tree.
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* pages must be locked first.
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@ -113,6 +113,9 @@ int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
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int __init extent_map_init(void);
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void __exit extent_map_exit(void);
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u64 count_range_bits(struct extent_map_tree *tree,
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u64 *start, u64 max_bytes, unsigned long bits);
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int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
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int bits, int filled);
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int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
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