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Btrfs: extent_io and extent_state optimizations
The end_bio routines are changed to take a pointer to the extent state struct, and the state tree is walked in order to set/clear appropriate bits as IO completes. This greatly reduces the number of rbtree searches done by the end_bio handlers, and reduces lock contention. The extent_io releasepage function is changed to avoid expensive searches for locked state. Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
parent
aadfeb6e39
commit
70dec8079d
@ -274,7 +274,7 @@ int btree_readpage(struct file *file, struct page *page)
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return extent_read_full_page(tree, page, btree_get_extent);
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}
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static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags)
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static int btree_releasepage(struct page *page, gfp_t gfp_flags)
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{
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struct extent_io_tree *tree;
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struct extent_map_tree *map;
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@ -282,7 +282,7 @@ static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags)
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tree = &BTRFS_I(page->mapping->host)->io_tree;
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map = &BTRFS_I(page->mapping->host)->extent_tree;
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ret = try_release_extent_mapping(map, tree, page);
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ret = try_release_extent_mapping(map, tree, page, gfp_flags);
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if (ret == 1) {
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ClearPagePrivate(page);
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set_page_private(page, 0);
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@ -27,13 +27,11 @@ static struct kmem_cache *extent_buffer_cache;
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static LIST_HEAD(buffers);
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static LIST_HEAD(states);
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static spinlock_t state_lock = SPIN_LOCK_UNLOCKED;
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#define BUFFER_LRU_MAX 64
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struct tree_entry {
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u64 start;
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u64 end;
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int in_tree;
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struct rb_node rb_node;
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};
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@ -69,7 +67,7 @@ void extent_io_exit(void)
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while (!list_empty(&states)) {
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state = list_entry(states.next, struct extent_state, list);
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printk("state leak: start %Lu end %Lu state %lu in tree %d refs %d\n", state->start, state->end, state->state, state->in_tree, atomic_read(&state->refs));
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printk("state leak: start %Lu end %Lu state %lu in tree %p refs %d\n", state->start, state->end, state->state, state->tree, atomic_read(&state->refs));
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list_del(&state->list);
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kmem_cache_free(extent_state_cache, state);
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@ -87,7 +85,7 @@ void extent_io_tree_init(struct extent_io_tree *tree,
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tree->state.rb_node = NULL;
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tree->ops = NULL;
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tree->dirty_bytes = 0;
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rwlock_init(&tree->lock);
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spin_lock_init(&tree->lock);
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spin_lock_init(&tree->lru_lock);
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tree->mapping = mapping;
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INIT_LIST_HEAD(&tree->buffer_lru);
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@ -110,18 +108,13 @@ EXPORT_SYMBOL(extent_io_tree_empty_lru);
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struct extent_state *alloc_extent_state(gfp_t mask)
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{
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struct extent_state *state;
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unsigned long flags;
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state = kmem_cache_alloc(extent_state_cache, mask);
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if (!state || IS_ERR(state))
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return state;
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state->state = 0;
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state->in_tree = 0;
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state->private = 0;
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spin_lock_irqsave(&state_lock, flags);
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list_add(&state->list, &states);
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spin_unlock_irqrestore(&state_lock, flags);
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state->tree = NULL;
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atomic_set(&state->refs, 1);
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init_waitqueue_head(&state->wq);
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@ -131,14 +124,10 @@ EXPORT_SYMBOL(alloc_extent_state);
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void free_extent_state(struct extent_state *state)
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{
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unsigned long flags;
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if (!state)
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return;
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if (atomic_dec_and_test(&state->refs)) {
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WARN_ON(state->in_tree);
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spin_lock_irqsave(&state_lock, flags);
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list_del(&state->list);
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spin_unlock_irqrestore(&state_lock, flags);
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WARN_ON(state->tree);
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kmem_cache_free(extent_state_cache, state);
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}
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}
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@ -164,7 +153,6 @@ static struct rb_node *tree_insert(struct rb_root *root, u64 offset,
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}
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entry = rb_entry(node, struct tree_entry, rb_node);
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entry->in_tree = 1;
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rb_link_node(node, parent, p);
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rb_insert_color(node, root);
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return NULL;
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@ -216,8 +204,9 @@ static struct rb_node *__tree_search(struct rb_root *root, u64 offset,
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static inline struct rb_node *tree_search(struct rb_root *root, u64 offset)
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{
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struct rb_node *prev;
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struct rb_node *prev = NULL;
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struct rb_node *ret;
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ret = __tree_search(root, offset, &prev, NULL);
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if (!ret)
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return prev;
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@ -248,7 +237,7 @@ static int merge_state(struct extent_io_tree *tree,
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if (other->end == state->start - 1 &&
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other->state == state->state) {
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state->start = other->start;
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other->in_tree = 0;
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other->tree = NULL;
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rb_erase(&other->rb_node, &tree->state);
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free_extent_state(other);
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}
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@ -259,7 +248,7 @@ static int merge_state(struct extent_io_tree *tree,
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if (other->start == state->end + 1 &&
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other->state == state->state) {
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other->start = state->start;
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state->in_tree = 0;
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state->tree = NULL;
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rb_erase(&state->rb_node, &tree->state);
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free_extent_state(state);
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}
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@ -300,6 +289,7 @@ static int insert_state(struct extent_io_tree *tree,
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free_extent_state(state);
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return -EEXIST;
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}
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state->tree = tree;
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merge_state(tree, state);
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return 0;
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}
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@ -335,6 +325,7 @@ static int split_state(struct extent_io_tree *tree, struct extent_state *orig,
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free_extent_state(prealloc);
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return -EEXIST;
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}
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prealloc->tree = tree;
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return 0;
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}
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@ -361,9 +352,9 @@ static int clear_state_bit(struct extent_io_tree *tree,
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if (wake)
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wake_up(&state->wq);
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if (delete || state->state == 0) {
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if (state->in_tree) {
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if (state->tree) {
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rb_erase(&state->rb_node, &tree->state);
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state->in_tree = 0;
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state->tree = NULL;
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free_extent_state(state);
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} else {
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WARN_ON(1);
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@ -404,7 +395,7 @@ again:
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return -ENOMEM;
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}
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write_lock_irqsave(&tree->lock, flags);
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spin_lock_irqsave(&tree->lock, flags);
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/*
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* this search will find the extents that end after
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* our range starts
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@ -434,6 +425,8 @@ again:
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*/
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if (state->start < start) {
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if (!prealloc)
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prealloc = alloc_extent_state(GFP_ATOMIC);
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err = split_state(tree, state, prealloc, start);
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BUG_ON(err == -EEXIST);
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prealloc = NULL;
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@ -455,6 +448,8 @@ again:
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* on the first half
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*/
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if (state->start <= end && state->end > end) {
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if (!prealloc)
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prealloc = alloc_extent_state(GFP_ATOMIC);
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err = split_state(tree, state, prealloc, end + 1);
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BUG_ON(err == -EEXIST);
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@ -471,7 +466,7 @@ again:
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goto search_again;
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out:
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write_unlock_irqrestore(&tree->lock, flags);
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spin_unlock_irqrestore(&tree->lock, flags);
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if (prealloc)
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free_extent_state(prealloc);
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@ -480,7 +475,7 @@ out:
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search_again:
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if (start > end)
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goto out;
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write_unlock_irqrestore(&tree->lock, flags);
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spin_unlock_irqrestore(&tree->lock, flags);
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if (mask & __GFP_WAIT)
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cond_resched();
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goto again;
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@ -492,9 +487,9 @@ static int wait_on_state(struct extent_io_tree *tree,
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{
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DEFINE_WAIT(wait);
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prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE);
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read_unlock_irq(&tree->lock);
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spin_unlock_irq(&tree->lock);
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schedule();
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read_lock_irq(&tree->lock);
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spin_lock_irq(&tree->lock);
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finish_wait(&state->wq, &wait);
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return 0;
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}
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@ -509,7 +504,7 @@ int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits)
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struct extent_state *state;
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struct rb_node *node;
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read_lock_irq(&tree->lock);
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spin_lock_irq(&tree->lock);
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again:
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while (1) {
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/*
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@ -538,13 +533,13 @@ again:
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break;
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if (need_resched()) {
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read_unlock_irq(&tree->lock);
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spin_unlock_irq(&tree->lock);
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cond_resched();
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read_lock_irq(&tree->lock);
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spin_lock_irq(&tree->lock);
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}
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}
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out:
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read_unlock_irq(&tree->lock);
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spin_unlock_irq(&tree->lock);
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return 0;
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}
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EXPORT_SYMBOL(wait_extent_bit);
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@ -589,7 +584,7 @@ again:
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return -ENOMEM;
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}
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write_lock_irqsave(&tree->lock, flags);
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spin_lock_irqsave(&tree->lock, flags);
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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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@ -709,7 +704,7 @@ again:
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goto search_again;
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out:
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write_unlock_irqrestore(&tree->lock, flags);
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spin_unlock_irqrestore(&tree->lock, flags);
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if (prealloc)
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free_extent_state(prealloc);
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@ -718,7 +713,7 @@ out:
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search_again:
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if (start > end)
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goto out;
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write_unlock_irqrestore(&tree->lock, flags);
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spin_unlock_irqrestore(&tree->lock, flags);
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if (mask & __GFP_WAIT)
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cond_resched();
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goto again;
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@ -817,10 +812,6 @@ int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end)
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}
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EXPORT_SYMBOL(wait_on_extent_writeback);
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/*
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* locks a range in ascending order, waiting for any locked regions
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* it hits on the way. [start,end] are inclusive, and this will sleep.
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*/
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int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask)
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{
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int err;
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@ -896,7 +887,7 @@ int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
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struct extent_state *state;
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int ret = 1;
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read_lock_irq(&tree->lock);
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spin_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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@ -919,7 +910,7 @@ int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
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break;
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}
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out:
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read_unlock_irq(&tree->lock);
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spin_unlock_irq(&tree->lock);
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return ret;
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}
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EXPORT_SYMBOL(find_first_extent_bit);
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@ -933,7 +924,7 @@ u64 find_lock_delalloc_range(struct extent_io_tree *tree,
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u64 found = 0;
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u64 total_bytes = 0;
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write_lock_irq(&tree->lock);
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spin_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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@ -976,9 +967,9 @@ search_again:
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atomic_inc(&state->refs);
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prepare_to_wait(&state->wq, &wait,
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TASK_UNINTERRUPTIBLE);
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write_unlock_irq(&tree->lock);
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spin_unlock_irq(&tree->lock);
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schedule();
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write_lock_irq(&tree->lock);
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spin_lock_irq(&tree->lock);
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finish_wait(&state->wq, &wait);
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free_extent_state(state);
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goto search_again;
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@ -997,7 +988,7 @@ search_again:
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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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spin_unlock_irq(&tree->lock);
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return found;
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}
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@ -1017,7 +1008,7 @@ u64 count_range_bits(struct extent_io_tree *tree,
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return 0;
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}
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write_lock_irq(&tree->lock);
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spin_lock_irq(&tree->lock);
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if (cur_start == 0 && bits == EXTENT_DIRTY) {
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total_bytes = tree->dirty_bytes;
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goto out;
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@ -1050,7 +1041,7 @@ u64 count_range_bits(struct extent_io_tree *tree,
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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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spin_unlock_irq(&tree->lock);
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return total_bytes;
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}
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/*
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@ -1122,7 +1113,7 @@ int set_state_private(struct extent_io_tree *tree, u64 start, u64 private)
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struct extent_state *state;
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int ret = 0;
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write_lock_irq(&tree->lock);
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spin_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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@ -1139,7 +1130,7 @@ int set_state_private(struct extent_io_tree *tree, u64 start, u64 private)
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}
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state->private = private;
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out:
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write_unlock_irq(&tree->lock);
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spin_unlock_irq(&tree->lock);
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return ret;
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}
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@ -1149,7 +1140,7 @@ int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private)
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struct extent_state *state;
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int ret = 0;
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read_lock_irq(&tree->lock);
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spin_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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@ -1166,13 +1157,13 @@ int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private)
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}
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*private = state->private;
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out:
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read_unlock_irq(&tree->lock);
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spin_unlock_irq(&tree->lock);
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return ret;
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}
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/*
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* searches a range in the state tree for a given mask.
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* If 'filled' == 1, this returns 1 only if ever extent in the tree
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* If 'filled' == 1, this returns 1 only if every extent in the tree
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* has the bits set. Otherwise, 1 is returned if any bit in the
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* range is found set.
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*/
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@ -1184,7 +1175,7 @@ int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
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int bitset = 0;
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unsigned long flags;
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read_lock_irqsave(&tree->lock, flags);
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spin_lock_irqsave(&tree->lock, flags);
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node = tree_search(&tree->state, start);
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while (node && start <= end) {
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state = rb_entry(node, struct extent_state, rb_node);
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@ -1215,7 +1206,7 @@ int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
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break;
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}
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}
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read_unlock_irqrestore(&tree->lock, flags);
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spin_unlock_irqrestore(&tree->lock, flags);
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return bitset;
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}
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EXPORT_SYMBOL(test_range_bit);
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@ -1282,16 +1273,19 @@ static int end_bio_extent_writepage(struct bio *bio,
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{
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const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
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struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
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struct extent_io_tree *tree = bio->bi_private;
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struct extent_state *state = bio->bi_private;
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struct extent_io_tree *tree = state->tree;
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struct rb_node *node;
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u64 start;
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u64 end;
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u64 cur;
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int whole_page;
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unsigned long flags;
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#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
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if (bio->bi_size)
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return 1;
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#endif
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do {
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struct page *page = bvec->bv_page;
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start = ((u64)page->index << PAGE_CACHE_SHIFT) +
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@ -1311,16 +1305,80 @@ static int end_bio_extent_writepage(struct bio *bio,
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ClearPageUptodate(page);
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SetPageError(page);
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}
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clear_extent_writeback(tree, start, end, GFP_ATOMIC);
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if (tree->ops && tree->ops->writepage_end_io_hook) {
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tree->ops->writepage_end_io_hook(page, start, end,
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state);
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}
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/*
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* bios can get merged in funny ways, and so we need to
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* be careful with the state variable. We know the
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* state won't be merged with others because it has
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* WRITEBACK set, but we can't be sure each biovec is
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* sequential in the file. So, if our cached state
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* doesn't match the expected end, search the tree
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* for the correct one.
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*/
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spin_lock_irqsave(&tree->lock, flags);
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if (!state || state->end != end) {
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state = NULL;
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node = __tree_search(&tree->state, start, NULL, NULL);
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||||
if (node) {
|
||||
state = rb_entry(node, struct extent_state,
|
||||
rb_node);
|
||||
if (state->end != end ||
|
||||
!(state->state & EXTENT_WRITEBACK))
|
||||
state = NULL;
|
||||
}
|
||||
if (!state) {
|
||||
spin_unlock_irqrestore(&tree->lock, flags);
|
||||
clear_extent_writeback(tree, start,
|
||||
end, GFP_ATOMIC);
|
||||
goto next_io;
|
||||
}
|
||||
}
|
||||
cur = end;
|
||||
while(1) {
|
||||
struct extent_state *clear = state;
|
||||
cur = state->start;
|
||||
node = rb_prev(&state->rb_node);
|
||||
if (node) {
|
||||
state = rb_entry(node,
|
||||
struct extent_state,
|
||||
rb_node);
|
||||
} else {
|
||||
state = NULL;
|
||||
}
|
||||
|
||||
clear_state_bit(tree, clear, EXTENT_WRITEBACK,
|
||||
1, 0);
|
||||
if (cur == start)
|
||||
break;
|
||||
if (cur < start) {
|
||||
WARN_ON(1);
|
||||
break;
|
||||
}
|
||||
if (!node)
|
||||
break;
|
||||
}
|
||||
/* before releasing the lock, make sure the next state
|
||||
* variable has the expected bits set and corresponds
|
||||
* to the correct offsets in the file
|
||||
*/
|
||||
if (state && (state->end + 1 != start ||
|
||||
!state->state & EXTENT_WRITEBACK)) {
|
||||
state = NULL;
|
||||
}
|
||||
spin_unlock_irqrestore(&tree->lock, flags);
|
||||
next_io:
|
||||
|
||||
if (whole_page)
|
||||
end_page_writeback(page);
|
||||
else
|
||||
check_page_writeback(tree, page);
|
||||
if (tree->ops && tree->ops->writepage_end_io_hook)
|
||||
tree->ops->writepage_end_io_hook(page, start, end);
|
||||
} while (bvec >= bio->bi_io_vec);
|
||||
|
||||
bio_put(bio);
|
||||
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
|
||||
return 0;
|
||||
@ -1347,9 +1405,13 @@ static int end_bio_extent_readpage(struct bio *bio,
|
||||
{
|
||||
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
|
||||
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
|
||||
struct extent_io_tree *tree = bio->bi_private;
|
||||
struct extent_state *state = bio->bi_private;
|
||||
struct extent_io_tree *tree = state->tree;
|
||||
struct rb_node *node;
|
||||
u64 start;
|
||||
u64 end;
|
||||
u64 cur;
|
||||
unsigned long flags;
|
||||
int whole_page;
|
||||
int ret;
|
||||
|
||||
@ -1373,27 +1435,83 @@ static int end_bio_extent_readpage(struct bio *bio,
|
||||
prefetchw(&bvec->bv_page->flags);
|
||||
|
||||
if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) {
|
||||
ret = tree->ops->readpage_end_io_hook(page, start, end);
|
||||
ret = tree->ops->readpage_end_io_hook(page, start, end,
|
||||
state);
|
||||
if (ret)
|
||||
uptodate = 0;
|
||||
}
|
||||
|
||||
spin_lock_irqsave(&tree->lock, flags);
|
||||
if (!state || state->end != end) {
|
||||
state = NULL;
|
||||
node = __tree_search(&tree->state, start, NULL, NULL);
|
||||
if (node) {
|
||||
state = rb_entry(node, struct extent_state,
|
||||
rb_node);
|
||||
if (state->end != end ||
|
||||
!(state->state & EXTENT_LOCKED))
|
||||
state = NULL;
|
||||
}
|
||||
if (!state) {
|
||||
spin_unlock_irqrestore(&tree->lock, flags);
|
||||
set_extent_uptodate(tree, start, end,
|
||||
GFP_ATOMIC);
|
||||
unlock_extent(tree, start, end, GFP_ATOMIC);
|
||||
goto next_io;
|
||||
}
|
||||
}
|
||||
|
||||
cur = end;
|
||||
while(1) {
|
||||
struct extent_state *clear = state;
|
||||
cur = state->start;
|
||||
node = rb_prev(&state->rb_node);
|
||||
if (node) {
|
||||
state = rb_entry(node,
|
||||
struct extent_state,
|
||||
rb_node);
|
||||
} else {
|
||||
state = NULL;
|
||||
}
|
||||
clear->state |= EXTENT_UPTODATE;
|
||||
clear_state_bit(tree, clear, EXTENT_LOCKED,
|
||||
1, 0);
|
||||
if (cur == start)
|
||||
break;
|
||||
if (cur < start) {
|
||||
WARN_ON(1);
|
||||
break;
|
||||
}
|
||||
if (!node)
|
||||
break;
|
||||
}
|
||||
/* before releasing the lock, make sure the next state
|
||||
* variable has the expected bits set and corresponds
|
||||
* to the correct offsets in the file
|
||||
*/
|
||||
if (state && (state->end + 1 != start ||
|
||||
!state->state & EXTENT_WRITEBACK)) {
|
||||
state = NULL;
|
||||
}
|
||||
spin_unlock_irqrestore(&tree->lock, flags);
|
||||
next_io:
|
||||
if (whole_page) {
|
||||
if (uptodate) {
|
||||
set_extent_uptodate(tree, start, end, GFP_ATOMIC);
|
||||
if (whole_page)
|
||||
SetPageUptodate(page);
|
||||
else
|
||||
} else {
|
||||
ClearPageUptodate(page);
|
||||
SetPageError(page);
|
||||
}
|
||||
unlock_page(page);
|
||||
} else {
|
||||
if (uptodate) {
|
||||
check_page_uptodate(tree, page);
|
||||
} else {
|
||||
ClearPageUptodate(page);
|
||||
SetPageError(page);
|
||||
}
|
||||
|
||||
unlock_extent(tree, start, end, GFP_ATOMIC);
|
||||
|
||||
if (whole_page)
|
||||
unlock_page(page);
|
||||
else
|
||||
check_page_locked(tree, page);
|
||||
}
|
||||
} while (bvec >= bio->bi_io_vec);
|
||||
|
||||
bio_put(bio);
|
||||
@ -1416,7 +1534,8 @@ static int end_bio_extent_preparewrite(struct bio *bio,
|
||||
{
|
||||
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
|
||||
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
|
||||
struct extent_io_tree *tree = bio->bi_private;
|
||||
struct extent_state *state = bio->bi_private;
|
||||
struct extent_io_tree *tree = state->tree;
|
||||
u64 start;
|
||||
u64 end;
|
||||
|
||||
@ -1475,6 +1594,29 @@ static int submit_one_bio(int rw, struct bio *bio)
|
||||
{
|
||||
u64 maxsector;
|
||||
int ret = 0;
|
||||
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
|
||||
struct page *page = bvec->bv_page;
|
||||
struct extent_io_tree *tree = bio->bi_private;
|
||||
struct rb_node *node;
|
||||
struct extent_state *state;
|
||||
u64 start;
|
||||
u64 end;
|
||||
|
||||
start = ((u64)page->index << PAGE_CACHE_SHIFT) + bvec->bv_offset;
|
||||
end = start + bvec->bv_len - 1;
|
||||
|
||||
spin_lock_irq(&tree->lock);
|
||||
node = __tree_search(&tree->state, start, NULL, NULL);
|
||||
BUG_ON(!node);
|
||||
state = rb_entry(node, struct extent_state, rb_node);
|
||||
while(state->end < end) {
|
||||
node = rb_next(node);
|
||||
state = rb_entry(node, struct extent_state, rb_node);
|
||||
}
|
||||
BUG_ON(state->end != end);
|
||||
spin_unlock_irq(&tree->lock);
|
||||
|
||||
bio->bi_private = state;
|
||||
|
||||
bio_get(bio);
|
||||
|
||||
@ -1519,9 +1661,12 @@ static int submit_extent_page(int rw, struct extent_io_tree *tree,
|
||||
if (!bio) {
|
||||
printk("failed to allocate bio nr %d\n", nr);
|
||||
}
|
||||
|
||||
|
||||
bio_add_page(bio, page, size, offset);
|
||||
bio->bi_end_io = end_io_func;
|
||||
bio->bi_private = tree;
|
||||
|
||||
if (bio_ret) {
|
||||
*bio_ret = bio;
|
||||
} else {
|
||||
@ -1635,6 +1780,16 @@ static int __extent_read_full_page(struct extent_io_tree *tree,
|
||||
page_offset += iosize;
|
||||
continue;
|
||||
}
|
||||
/* we have an inline extent but it didn't get marked up
|
||||
* to date. Error out
|
||||
*/
|
||||
if (block_start == EXTENT_MAP_INLINE) {
|
||||
SetPageError(page);
|
||||
unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS);
|
||||
cur = cur + iosize;
|
||||
page_offset += iosize;
|
||||
continue;
|
||||
}
|
||||
|
||||
ret = 0;
|
||||
if (tree->ops && tree->ops->readpage_io_hook) {
|
||||
@ -2205,7 +2360,8 @@ EXPORT_SYMBOL(extent_prepare_write);
|
||||
* map records are removed
|
||||
*/
|
||||
int try_release_extent_mapping(struct extent_map_tree *map,
|
||||
struct extent_io_tree *tree, struct page *page)
|
||||
struct extent_io_tree *tree, struct page *page,
|
||||
gfp_t mask)
|
||||
{
|
||||
struct extent_map *em;
|
||||
u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
|
||||
@ -2213,6 +2369,8 @@ int try_release_extent_mapping(struct extent_map_tree *map,
|
||||
u64 orig_start = start;
|
||||
int ret = 1;
|
||||
|
||||
if ((mask & __GFP_WAIT) &&
|
||||
page->mapping->host->i_size > 16 * 1024 * 1024) {
|
||||
while (start <= end) {
|
||||
spin_lock(&map->lock);
|
||||
em = lookup_extent_mapping(map, start, end);
|
||||
@ -2220,7 +2378,13 @@ int try_release_extent_mapping(struct extent_map_tree *map,
|
||||
spin_unlock(&map->lock);
|
||||
break;
|
||||
}
|
||||
if (!test_range_bit(tree, em->start, extent_map_end(em) - 1,
|
||||
if (em->start != start) {
|
||||
spin_unlock(&map->lock);
|
||||
free_extent_map(em);
|
||||
break;
|
||||
}
|
||||
if (!test_range_bit(tree, em->start,
|
||||
extent_map_end(em) - 1,
|
||||
EXTENT_LOCKED, 0)) {
|
||||
remove_extent_mapping(map, em);
|
||||
/* once for the rb tree */
|
||||
@ -2232,11 +2396,15 @@ int try_release_extent_mapping(struct extent_map_tree *map,
|
||||
/* once for us */
|
||||
free_extent_map(em);
|
||||
}
|
||||
if (test_range_bit(tree, orig_start, end, EXTENT_LOCKED, 0))
|
||||
}
|
||||
if (test_range_bit(tree, orig_start, end, EXTENT_IOBITS, 0))
|
||||
ret = 0;
|
||||
else
|
||||
else {
|
||||
if ((mask & GFP_NOFS) == GFP_NOFS)
|
||||
mask = GFP_NOFS;
|
||||
clear_extent_bit(tree, orig_start, end, EXTENT_UPTODATE,
|
||||
1, 1, GFP_NOFS);
|
||||
1, 1, mask);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(try_release_extent_mapping);
|
||||
@ -2553,13 +2721,13 @@ int clear_extent_buffer_dirty(struct extent_io_tree *tree,
|
||||
}
|
||||
}
|
||||
clear_page_dirty_for_io(page);
|
||||
write_lock_irq(&page->mapping->tree_lock);
|
||||
read_lock_irq(&page->mapping->tree_lock);
|
||||
if (!PageDirty(page)) {
|
||||
radix_tree_tag_clear(&page->mapping->page_tree,
|
||||
page_index(page),
|
||||
PAGECACHE_TAG_DIRTY);
|
||||
}
|
||||
write_unlock_irq(&page->mapping->tree_lock);
|
||||
read_unlock_irq(&page->mapping->tree_lock);
|
||||
unlock_page(page);
|
||||
}
|
||||
return 0;
|
||||
|
||||
@ -23,19 +23,23 @@
|
||||
#define EXTENT_PAGE_PRIVATE 1
|
||||
#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
|
||||
|
||||
struct extent_state;
|
||||
|
||||
struct extent_io_ops {
|
||||
int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
|
||||
int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
|
||||
int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
|
||||
int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
|
||||
void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
|
||||
int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
|
||||
struct extent_state *state);
|
||||
void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
|
||||
struct extent_state *state);
|
||||
};
|
||||
|
||||
struct extent_io_tree {
|
||||
struct rb_root state;
|
||||
struct address_space *mapping;
|
||||
u64 dirty_bytes;
|
||||
rwlock_t lock;
|
||||
spinlock_t lock;
|
||||
struct extent_io_ops *ops;
|
||||
spinlock_t lru_lock;
|
||||
struct list_head buffer_lru;
|
||||
@ -45,8 +49,8 @@ struct extent_io_tree {
|
||||
struct extent_state {
|
||||
u64 start;
|
||||
u64 end; /* inclusive */
|
||||
int in_tree;
|
||||
struct rb_node rb_node;
|
||||
struct extent_io_tree *tree;
|
||||
wait_queue_head_t wq;
|
||||
atomic_t refs;
|
||||
unsigned long state;
|
||||
@ -82,7 +86,8 @@ void extent_io_tree_init(struct extent_io_tree *tree,
|
||||
struct address_space *mapping, gfp_t mask);
|
||||
void extent_io_tree_empty_lru(struct extent_io_tree *tree);
|
||||
int try_release_extent_mapping(struct extent_map_tree *map,
|
||||
struct extent_io_tree *tree, struct page *page);
|
||||
struct extent_io_tree *tree, struct page *page,
|
||||
gfp_t mask);
|
||||
int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
|
||||
int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
|
||||
int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
|
||||
|
||||
@ -331,7 +331,8 @@ out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
|
||||
int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
|
||||
struct extent_state *state)
|
||||
{
|
||||
size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
|
||||
struct inode *inode = page->mapping->host;
|
||||
@ -347,7 +348,12 @@ int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
|
||||
btrfs_test_flag(inode, NODATASUM))
|
||||
return 0;
|
||||
|
||||
if (state->start == start) {
|
||||
private = state->private;
|
||||
ret = 0;
|
||||
} else {
|
||||
ret = get_state_private(io_tree, start, &private);
|
||||
}
|
||||
local_irq_save(flags);
|
||||
kaddr = kmap_atomic(page, KM_IRQ0);
|
||||
if (ret) {
|
||||
@ -1830,7 +1836,7 @@ out_unlock:
|
||||
}
|
||||
|
||||
struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
|
||||
size_t page_offset, u64 start, u64 len,
|
||||
size_t pg_offset, u64 start, u64 len,
|
||||
int create)
|
||||
{
|
||||
int ret;
|
||||
@ -1865,6 +1871,9 @@ again:
|
||||
start, len, em->start, em->len);
|
||||
WARN_ON(1);
|
||||
}
|
||||
if (em->block_start == EXTENT_MAP_INLINE && page)
|
||||
free_extent_map(em);
|
||||
else
|
||||
goto out;
|
||||
}
|
||||
em = alloc_extent_map(GFP_NOFS);
|
||||
@ -1930,6 +1939,7 @@ again:
|
||||
em->len = extent_end - extent_start;
|
||||
goto insert;
|
||||
} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
|
||||
u64 page_start;
|
||||
unsigned long ptr;
|
||||
char *map;
|
||||
size_t size;
|
||||
@ -1959,16 +1969,17 @@ again:
|
||||
goto out;
|
||||
}
|
||||
|
||||
extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) -
|
||||
extent_start + page_offset;
|
||||
copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset,
|
||||
page_start = page_offset(page) + pg_offset;
|
||||
extent_offset = page_start - extent_start;
|
||||
copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
|
||||
size - extent_offset);
|
||||
em->start = extent_start + extent_offset;
|
||||
em->len = copy_size;
|
||||
em->len = (copy_size + root->sectorsize - 1) &
|
||||
~((u64)root->sectorsize - 1);
|
||||
map = kmap(page);
|
||||
ptr = btrfs_file_extent_inline_start(item) + extent_offset;
|
||||
if (create == 0 && !PageUptodate(page)) {
|
||||
read_extent_buffer(leaf, map + page_offset, ptr,
|
||||
read_extent_buffer(leaf, map + pg_offset, ptr,
|
||||
copy_size);
|
||||
flush_dcache_page(page);
|
||||
} else if (create && PageUptodate(page)) {
|
||||
@ -1980,7 +1991,7 @@ again:
|
||||
trans = btrfs_start_transaction(root, 1);
|
||||
goto again;
|
||||
}
|
||||
write_extent_buffer(leaf, map + page_offset, ptr,
|
||||
write_extent_buffer(leaf, map + pg_offset, ptr,
|
||||
copy_size);
|
||||
btrfs_mark_buffer_dirty(leaf);
|
||||
}
|
||||
@ -2077,7 +2088,7 @@ btrfs_readpages(struct file *file, struct address_space *mapping,
|
||||
btrfs_get_extent);
|
||||
}
|
||||
|
||||
static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
|
||||
static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
|
||||
{
|
||||
struct extent_io_tree *tree;
|
||||
struct extent_map_tree *map;
|
||||
@ -2085,7 +2096,7 @@ static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
|
||||
|
||||
tree = &BTRFS_I(page->mapping->host)->io_tree;
|
||||
map = &BTRFS_I(page->mapping->host)->extent_tree;
|
||||
ret = try_release_extent_mapping(map, tree, page);
|
||||
ret = try_release_extent_mapping(map, tree, page, gfp_flags);
|
||||
if (ret == 1) {
|
||||
ClearPagePrivate(page);
|
||||
set_page_private(page, 0);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user