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![David Sterba](/assets/img/avatar_default.png)
The tree pointer can be safely read from the inode so we can drop the redundant argument from btrfs_lock_and_flush_ordered_range. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
893 lines
24 KiB
C
893 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*/
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include <linux/writeback.h>
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#include <linux/sched/mm.h>
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#include "misc.h"
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#include "ctree.h"
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#include "transaction.h"
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#include "btrfs_inode.h"
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#include "extent_io.h"
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#include "disk-io.h"
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#include "compression.h"
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#include "delalloc-space.h"
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static struct kmem_cache *btrfs_ordered_extent_cache;
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static u64 entry_end(struct btrfs_ordered_extent *entry)
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{
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if (entry->file_offset + entry->num_bytes < entry->file_offset)
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return (u64)-1;
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return entry->file_offset + entry->num_bytes;
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}
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/* returns NULL if the insertion worked, or it returns the node it did find
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* in the tree
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*/
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static struct rb_node *tree_insert(struct rb_root *root, u64 file_offset,
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struct rb_node *node)
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{
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struct rb_node **p = &root->rb_node;
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struct rb_node *parent = NULL;
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struct btrfs_ordered_extent *entry;
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while (*p) {
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parent = *p;
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entry = rb_entry(parent, struct btrfs_ordered_extent, rb_node);
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if (file_offset < entry->file_offset)
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p = &(*p)->rb_left;
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else if (file_offset >= entry_end(entry))
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p = &(*p)->rb_right;
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else
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return parent;
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}
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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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}
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/*
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* look for a given offset in the tree, and if it can't be found return the
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* first lesser offset
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*/
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static struct rb_node *__tree_search(struct rb_root *root, u64 file_offset,
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struct rb_node **prev_ret)
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{
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struct rb_node *n = root->rb_node;
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struct rb_node *prev = NULL;
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struct rb_node *test;
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struct btrfs_ordered_extent *entry;
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struct btrfs_ordered_extent *prev_entry = NULL;
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while (n) {
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entry = rb_entry(n, struct btrfs_ordered_extent, rb_node);
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prev = n;
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prev_entry = entry;
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if (file_offset < entry->file_offset)
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n = n->rb_left;
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else if (file_offset >= entry_end(entry))
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n = n->rb_right;
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else
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return n;
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}
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if (!prev_ret)
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return NULL;
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while (prev && file_offset >= entry_end(prev_entry)) {
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test = rb_next(prev);
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if (!test)
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break;
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prev_entry = rb_entry(test, struct btrfs_ordered_extent,
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rb_node);
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if (file_offset < entry_end(prev_entry))
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break;
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prev = test;
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}
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if (prev)
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prev_entry = rb_entry(prev, struct btrfs_ordered_extent,
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rb_node);
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while (prev && file_offset < entry_end(prev_entry)) {
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test = rb_prev(prev);
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if (!test)
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break;
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prev_entry = rb_entry(test, struct btrfs_ordered_extent,
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rb_node);
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prev = test;
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}
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*prev_ret = prev;
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return NULL;
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}
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/*
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* helper to check if a given offset is inside a given entry
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*/
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static int offset_in_entry(struct btrfs_ordered_extent *entry, u64 file_offset)
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{
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if (file_offset < entry->file_offset ||
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entry->file_offset + entry->num_bytes <= file_offset)
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return 0;
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return 1;
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}
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static int range_overlaps(struct btrfs_ordered_extent *entry, u64 file_offset,
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u64 len)
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{
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if (file_offset + len <= entry->file_offset ||
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entry->file_offset + entry->num_bytes <= file_offset)
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return 0;
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return 1;
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}
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/*
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* look find the first ordered struct that has this offset, otherwise
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* the first one less than this offset
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*/
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static inline struct rb_node *tree_search(struct btrfs_ordered_inode_tree *tree,
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u64 file_offset)
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{
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struct rb_root *root = &tree->tree;
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struct rb_node *prev = NULL;
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struct rb_node *ret;
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struct btrfs_ordered_extent *entry;
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if (tree->last) {
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entry = rb_entry(tree->last, struct btrfs_ordered_extent,
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rb_node);
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if (offset_in_entry(entry, file_offset))
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return tree->last;
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}
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ret = __tree_search(root, file_offset, &prev);
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if (!ret)
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ret = prev;
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if (ret)
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tree->last = ret;
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return ret;
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}
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/* allocate and add a new ordered_extent into the per-inode tree.
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*
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* The tree is given a single reference on the ordered extent that was
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* inserted.
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*/
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static int __btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
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u64 disk_bytenr, u64 num_bytes,
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u64 disk_num_bytes, int type, int dio,
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int compress_type)
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{
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struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
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struct btrfs_root *root = BTRFS_I(inode)->root;
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struct btrfs_ordered_inode_tree *tree;
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struct rb_node *node;
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struct btrfs_ordered_extent *entry;
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tree = &BTRFS_I(inode)->ordered_tree;
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entry = kmem_cache_zalloc(btrfs_ordered_extent_cache, GFP_NOFS);
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if (!entry)
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return -ENOMEM;
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entry->file_offset = file_offset;
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entry->disk_bytenr = disk_bytenr;
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entry->num_bytes = num_bytes;
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entry->disk_num_bytes = disk_num_bytes;
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entry->bytes_left = num_bytes;
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entry->inode = igrab(inode);
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entry->compress_type = compress_type;
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entry->truncated_len = (u64)-1;
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if (type != BTRFS_ORDERED_IO_DONE && type != BTRFS_ORDERED_COMPLETE)
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set_bit(type, &entry->flags);
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if (dio) {
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percpu_counter_add_batch(&fs_info->dio_bytes, num_bytes,
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fs_info->delalloc_batch);
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set_bit(BTRFS_ORDERED_DIRECT, &entry->flags);
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}
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/* one ref for the tree */
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refcount_set(&entry->refs, 1);
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init_waitqueue_head(&entry->wait);
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INIT_LIST_HEAD(&entry->list);
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INIT_LIST_HEAD(&entry->root_extent_list);
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INIT_LIST_HEAD(&entry->work_list);
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init_completion(&entry->completion);
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INIT_LIST_HEAD(&entry->log_list);
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INIT_LIST_HEAD(&entry->trans_list);
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trace_btrfs_ordered_extent_add(inode, entry);
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spin_lock_irq(&tree->lock);
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node = tree_insert(&tree->tree, file_offset,
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&entry->rb_node);
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if (node)
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btrfs_panic(fs_info, -EEXIST,
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"inconsistency in ordered tree at offset %llu",
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file_offset);
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spin_unlock_irq(&tree->lock);
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spin_lock(&root->ordered_extent_lock);
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list_add_tail(&entry->root_extent_list,
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&root->ordered_extents);
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root->nr_ordered_extents++;
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if (root->nr_ordered_extents == 1) {
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spin_lock(&fs_info->ordered_root_lock);
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BUG_ON(!list_empty(&root->ordered_root));
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list_add_tail(&root->ordered_root, &fs_info->ordered_roots);
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spin_unlock(&fs_info->ordered_root_lock);
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}
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spin_unlock(&root->ordered_extent_lock);
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/*
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* We don't need the count_max_extents here, we can assume that all of
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* that work has been done at higher layers, so this is truly the
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* smallest the extent is going to get.
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*/
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spin_lock(&BTRFS_I(inode)->lock);
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btrfs_mod_outstanding_extents(BTRFS_I(inode), 1);
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spin_unlock(&BTRFS_I(inode)->lock);
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return 0;
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}
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int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
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u64 disk_bytenr, u64 num_bytes, u64 disk_num_bytes,
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int type)
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{
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return __btrfs_add_ordered_extent(inode, file_offset, disk_bytenr,
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num_bytes, disk_num_bytes, type, 0,
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BTRFS_COMPRESS_NONE);
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}
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int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
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u64 disk_bytenr, u64 num_bytes,
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u64 disk_num_bytes, int type)
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{
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return __btrfs_add_ordered_extent(inode, file_offset, disk_bytenr,
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num_bytes, disk_num_bytes, type, 1,
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BTRFS_COMPRESS_NONE);
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}
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int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset,
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u64 disk_bytenr, u64 num_bytes,
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u64 disk_num_bytes, int type,
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int compress_type)
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{
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return __btrfs_add_ordered_extent(inode, file_offset, disk_bytenr,
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num_bytes, disk_num_bytes, type, 0,
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compress_type);
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}
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/*
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* Add a struct btrfs_ordered_sum into the list of checksums to be inserted
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* when an ordered extent is finished. If the list covers more than one
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* ordered extent, it is split across multiples.
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*/
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void btrfs_add_ordered_sum(struct btrfs_ordered_extent *entry,
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struct btrfs_ordered_sum *sum)
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{
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struct btrfs_ordered_inode_tree *tree;
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tree = &BTRFS_I(entry->inode)->ordered_tree;
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spin_lock_irq(&tree->lock);
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list_add_tail(&sum->list, &entry->list);
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spin_unlock_irq(&tree->lock);
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}
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/*
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* this is used to account for finished IO across a given range
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* of the file. The IO may span ordered extents. If
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* a given ordered_extent is completely done, 1 is returned, otherwise
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* 0.
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*
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* test_and_set_bit on a flag in the struct btrfs_ordered_extent is used
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* to make sure this function only returns 1 once for a given ordered extent.
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*
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* file_offset is updated to one byte past the range that is recorded as
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* complete. This allows you to walk forward in the file.
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*/
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int btrfs_dec_test_first_ordered_pending(struct inode *inode,
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struct btrfs_ordered_extent **cached,
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u64 *file_offset, u64 io_size, int uptodate)
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{
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struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
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struct btrfs_ordered_inode_tree *tree;
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struct rb_node *node;
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struct btrfs_ordered_extent *entry = NULL;
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int ret;
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unsigned long flags;
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u64 dec_end;
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u64 dec_start;
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u64 to_dec;
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tree = &BTRFS_I(inode)->ordered_tree;
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spin_lock_irqsave(&tree->lock, flags);
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node = tree_search(tree, *file_offset);
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if (!node) {
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ret = 1;
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goto out;
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}
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entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
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if (!offset_in_entry(entry, *file_offset)) {
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ret = 1;
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goto out;
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}
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dec_start = max(*file_offset, entry->file_offset);
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dec_end = min(*file_offset + io_size,
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entry->file_offset + entry->num_bytes);
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*file_offset = dec_end;
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if (dec_start > dec_end) {
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btrfs_crit(fs_info, "bad ordering dec_start %llu end %llu",
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dec_start, dec_end);
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}
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to_dec = dec_end - dec_start;
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if (to_dec > entry->bytes_left) {
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btrfs_crit(fs_info,
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"bad ordered accounting left %llu size %llu",
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entry->bytes_left, to_dec);
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}
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entry->bytes_left -= to_dec;
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if (!uptodate)
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set_bit(BTRFS_ORDERED_IOERR, &entry->flags);
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if (entry->bytes_left == 0) {
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ret = test_and_set_bit(BTRFS_ORDERED_IO_DONE, &entry->flags);
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/* test_and_set_bit implies a barrier */
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cond_wake_up_nomb(&entry->wait);
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} else {
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ret = 1;
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}
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out:
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if (!ret && cached && entry) {
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*cached = entry;
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refcount_inc(&entry->refs);
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}
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spin_unlock_irqrestore(&tree->lock, flags);
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return ret == 0;
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}
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/*
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* this is used to account for finished IO across a given range
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* of the file. The IO should not span ordered extents. If
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* a given ordered_extent is completely done, 1 is returned, otherwise
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* 0.
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*
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* test_and_set_bit on a flag in the struct btrfs_ordered_extent is used
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* to make sure this function only returns 1 once for a given ordered extent.
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*/
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int btrfs_dec_test_ordered_pending(struct inode *inode,
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struct btrfs_ordered_extent **cached,
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u64 file_offset, u64 io_size, int uptodate)
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{
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struct btrfs_ordered_inode_tree *tree;
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struct rb_node *node;
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struct btrfs_ordered_extent *entry = NULL;
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unsigned long flags;
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int ret;
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tree = &BTRFS_I(inode)->ordered_tree;
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spin_lock_irqsave(&tree->lock, flags);
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if (cached && *cached) {
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entry = *cached;
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goto have_entry;
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}
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node = tree_search(tree, file_offset);
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if (!node) {
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ret = 1;
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goto out;
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}
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entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
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have_entry:
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if (!offset_in_entry(entry, file_offset)) {
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ret = 1;
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goto out;
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}
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if (io_size > entry->bytes_left) {
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btrfs_crit(BTRFS_I(inode)->root->fs_info,
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"bad ordered accounting left %llu size %llu",
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entry->bytes_left, io_size);
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}
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entry->bytes_left -= io_size;
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if (!uptodate)
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set_bit(BTRFS_ORDERED_IOERR, &entry->flags);
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if (entry->bytes_left == 0) {
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ret = test_and_set_bit(BTRFS_ORDERED_IO_DONE, &entry->flags);
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/* test_and_set_bit implies a barrier */
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cond_wake_up_nomb(&entry->wait);
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} else {
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ret = 1;
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}
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out:
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if (!ret && cached && entry) {
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*cached = entry;
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refcount_inc(&entry->refs);
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}
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spin_unlock_irqrestore(&tree->lock, flags);
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return ret == 0;
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}
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/*
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* used to drop a reference on an ordered extent. This will free
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* the extent if the last reference is dropped
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*/
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void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry)
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{
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struct list_head *cur;
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struct btrfs_ordered_sum *sum;
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trace_btrfs_ordered_extent_put(entry->inode, entry);
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if (refcount_dec_and_test(&entry->refs)) {
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ASSERT(list_empty(&entry->log_list));
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ASSERT(list_empty(&entry->trans_list));
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ASSERT(list_empty(&entry->root_extent_list));
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ASSERT(RB_EMPTY_NODE(&entry->rb_node));
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if (entry->inode)
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btrfs_add_delayed_iput(entry->inode);
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while (!list_empty(&entry->list)) {
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cur = entry->list.next;
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sum = list_entry(cur, struct btrfs_ordered_sum, list);
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list_del(&sum->list);
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kvfree(sum);
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}
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kmem_cache_free(btrfs_ordered_extent_cache, entry);
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}
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}
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/*
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* remove an ordered extent from the tree. No references are dropped
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* and waiters are woken up.
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*/
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void btrfs_remove_ordered_extent(struct inode *inode,
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struct btrfs_ordered_extent *entry)
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{
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struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
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struct btrfs_ordered_inode_tree *tree;
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struct btrfs_inode *btrfs_inode = BTRFS_I(inode);
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struct btrfs_root *root = btrfs_inode->root;
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struct rb_node *node;
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/* This is paired with btrfs_add_ordered_extent. */
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spin_lock(&btrfs_inode->lock);
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btrfs_mod_outstanding_extents(btrfs_inode, -1);
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spin_unlock(&btrfs_inode->lock);
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if (root != fs_info->tree_root)
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btrfs_delalloc_release_metadata(btrfs_inode, entry->num_bytes,
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false);
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if (test_bit(BTRFS_ORDERED_DIRECT, &entry->flags))
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percpu_counter_add_batch(&fs_info->dio_bytes, -entry->num_bytes,
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fs_info->delalloc_batch);
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tree = &btrfs_inode->ordered_tree;
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spin_lock_irq(&tree->lock);
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node = &entry->rb_node;
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rb_erase(node, &tree->tree);
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RB_CLEAR_NODE(node);
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if (tree->last == node)
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tree->last = NULL;
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set_bit(BTRFS_ORDERED_COMPLETE, &entry->flags);
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spin_unlock_irq(&tree->lock);
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spin_lock(&root->ordered_extent_lock);
|
|
list_del_init(&entry->root_extent_list);
|
|
root->nr_ordered_extents--;
|
|
|
|
trace_btrfs_ordered_extent_remove(inode, entry);
|
|
|
|
if (!root->nr_ordered_extents) {
|
|
spin_lock(&fs_info->ordered_root_lock);
|
|
BUG_ON(list_empty(&root->ordered_root));
|
|
list_del_init(&root->ordered_root);
|
|
spin_unlock(&fs_info->ordered_root_lock);
|
|
}
|
|
spin_unlock(&root->ordered_extent_lock);
|
|
wake_up(&entry->wait);
|
|
}
|
|
|
|
static void btrfs_run_ordered_extent_work(struct btrfs_work *work)
|
|
{
|
|
struct btrfs_ordered_extent *ordered;
|
|
|
|
ordered = container_of(work, struct btrfs_ordered_extent, flush_work);
|
|
btrfs_start_ordered_extent(ordered->inode, ordered, 1);
|
|
complete(&ordered->completion);
|
|
}
|
|
|
|
/*
|
|
* wait for all the ordered extents in a root. This is done when balancing
|
|
* space between drives.
|
|
*/
|
|
u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr,
|
|
const u64 range_start, const u64 range_len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
LIST_HEAD(splice);
|
|
LIST_HEAD(skipped);
|
|
LIST_HEAD(works);
|
|
struct btrfs_ordered_extent *ordered, *next;
|
|
u64 count = 0;
|
|
const u64 range_end = range_start + range_len;
|
|
|
|
mutex_lock(&root->ordered_extent_mutex);
|
|
spin_lock(&root->ordered_extent_lock);
|
|
list_splice_init(&root->ordered_extents, &splice);
|
|
while (!list_empty(&splice) && nr) {
|
|
ordered = list_first_entry(&splice, struct btrfs_ordered_extent,
|
|
root_extent_list);
|
|
|
|
if (range_end <= ordered->disk_bytenr ||
|
|
ordered->disk_bytenr + ordered->disk_num_bytes <= range_start) {
|
|
list_move_tail(&ordered->root_extent_list, &skipped);
|
|
cond_resched_lock(&root->ordered_extent_lock);
|
|
continue;
|
|
}
|
|
|
|
list_move_tail(&ordered->root_extent_list,
|
|
&root->ordered_extents);
|
|
refcount_inc(&ordered->refs);
|
|
spin_unlock(&root->ordered_extent_lock);
|
|
|
|
btrfs_init_work(&ordered->flush_work,
|
|
btrfs_run_ordered_extent_work, NULL, NULL);
|
|
list_add_tail(&ordered->work_list, &works);
|
|
btrfs_queue_work(fs_info->flush_workers, &ordered->flush_work);
|
|
|
|
cond_resched();
|
|
spin_lock(&root->ordered_extent_lock);
|
|
if (nr != U64_MAX)
|
|
nr--;
|
|
count++;
|
|
}
|
|
list_splice_tail(&skipped, &root->ordered_extents);
|
|
list_splice_tail(&splice, &root->ordered_extents);
|
|
spin_unlock(&root->ordered_extent_lock);
|
|
|
|
list_for_each_entry_safe(ordered, next, &works, work_list) {
|
|
list_del_init(&ordered->work_list);
|
|
wait_for_completion(&ordered->completion);
|
|
btrfs_put_ordered_extent(ordered);
|
|
cond_resched();
|
|
}
|
|
mutex_unlock(&root->ordered_extent_mutex);
|
|
|
|
return count;
|
|
}
|
|
|
|
void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr,
|
|
const u64 range_start, const u64 range_len)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct list_head splice;
|
|
u64 done;
|
|
|
|
INIT_LIST_HEAD(&splice);
|
|
|
|
mutex_lock(&fs_info->ordered_operations_mutex);
|
|
spin_lock(&fs_info->ordered_root_lock);
|
|
list_splice_init(&fs_info->ordered_roots, &splice);
|
|
while (!list_empty(&splice) && nr) {
|
|
root = list_first_entry(&splice, struct btrfs_root,
|
|
ordered_root);
|
|
root = btrfs_grab_root(root);
|
|
BUG_ON(!root);
|
|
list_move_tail(&root->ordered_root,
|
|
&fs_info->ordered_roots);
|
|
spin_unlock(&fs_info->ordered_root_lock);
|
|
|
|
done = btrfs_wait_ordered_extents(root, nr,
|
|
range_start, range_len);
|
|
btrfs_put_root(root);
|
|
|
|
spin_lock(&fs_info->ordered_root_lock);
|
|
if (nr != U64_MAX) {
|
|
nr -= done;
|
|
}
|
|
}
|
|
list_splice_tail(&splice, &fs_info->ordered_roots);
|
|
spin_unlock(&fs_info->ordered_root_lock);
|
|
mutex_unlock(&fs_info->ordered_operations_mutex);
|
|
}
|
|
|
|
/*
|
|
* Used to start IO or wait for a given ordered extent to finish.
|
|
*
|
|
* If wait is one, this effectively waits on page writeback for all the pages
|
|
* in the extent, and it waits on the io completion code to insert
|
|
* metadata into the btree corresponding to the extent
|
|
*/
|
|
void btrfs_start_ordered_extent(struct inode *inode,
|
|
struct btrfs_ordered_extent *entry,
|
|
int wait)
|
|
{
|
|
u64 start = entry->file_offset;
|
|
u64 end = start + entry->num_bytes - 1;
|
|
|
|
trace_btrfs_ordered_extent_start(inode, entry);
|
|
|
|
/*
|
|
* pages in the range can be dirty, clean or writeback. We
|
|
* start IO on any dirty ones so the wait doesn't stall waiting
|
|
* for the flusher thread to find them
|
|
*/
|
|
if (!test_bit(BTRFS_ORDERED_DIRECT, &entry->flags))
|
|
filemap_fdatawrite_range(inode->i_mapping, start, end);
|
|
if (wait) {
|
|
wait_event(entry->wait, test_bit(BTRFS_ORDERED_COMPLETE,
|
|
&entry->flags));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Used to wait on ordered extents across a large range of bytes.
|
|
*/
|
|
int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len)
|
|
{
|
|
int ret = 0;
|
|
int ret_wb = 0;
|
|
u64 end;
|
|
u64 orig_end;
|
|
struct btrfs_ordered_extent *ordered;
|
|
|
|
if (start + len < start) {
|
|
orig_end = INT_LIMIT(loff_t);
|
|
} else {
|
|
orig_end = start + len - 1;
|
|
if (orig_end > INT_LIMIT(loff_t))
|
|
orig_end = INT_LIMIT(loff_t);
|
|
}
|
|
|
|
/* start IO across the range first to instantiate any delalloc
|
|
* extents
|
|
*/
|
|
ret = btrfs_fdatawrite_range(inode, start, orig_end);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* If we have a writeback error don't return immediately. Wait first
|
|
* for any ordered extents that haven't completed yet. This is to make
|
|
* sure no one can dirty the same page ranges and call writepages()
|
|
* before the ordered extents complete - to avoid failures (-EEXIST)
|
|
* when adding the new ordered extents to the ordered tree.
|
|
*/
|
|
ret_wb = filemap_fdatawait_range(inode->i_mapping, start, orig_end);
|
|
|
|
end = orig_end;
|
|
while (1) {
|
|
ordered = btrfs_lookup_first_ordered_extent(inode, end);
|
|
if (!ordered)
|
|
break;
|
|
if (ordered->file_offset > orig_end) {
|
|
btrfs_put_ordered_extent(ordered);
|
|
break;
|
|
}
|
|
if (ordered->file_offset + ordered->num_bytes <= start) {
|
|
btrfs_put_ordered_extent(ordered);
|
|
break;
|
|
}
|
|
btrfs_start_ordered_extent(inode, ordered, 1);
|
|
end = ordered->file_offset;
|
|
/*
|
|
* If the ordered extent had an error save the error but don't
|
|
* exit without waiting first for all other ordered extents in
|
|
* the range to complete.
|
|
*/
|
|
if (test_bit(BTRFS_ORDERED_IOERR, &ordered->flags))
|
|
ret = -EIO;
|
|
btrfs_put_ordered_extent(ordered);
|
|
if (end == 0 || end == start)
|
|
break;
|
|
end--;
|
|
}
|
|
return ret_wb ? ret_wb : ret;
|
|
}
|
|
|
|
/*
|
|
* find an ordered extent corresponding to file_offset. return NULL if
|
|
* nothing is found, otherwise take a reference on the extent and return it
|
|
*/
|
|
struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
|
|
u64 file_offset)
|
|
{
|
|
struct btrfs_ordered_inode_tree *tree;
|
|
struct rb_node *node;
|
|
struct btrfs_ordered_extent *entry = NULL;
|
|
|
|
tree = &BTRFS_I(inode)->ordered_tree;
|
|
spin_lock_irq(&tree->lock);
|
|
node = tree_search(tree, file_offset);
|
|
if (!node)
|
|
goto out;
|
|
|
|
entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
|
|
if (!offset_in_entry(entry, file_offset))
|
|
entry = NULL;
|
|
if (entry)
|
|
refcount_inc(&entry->refs);
|
|
out:
|
|
spin_unlock_irq(&tree->lock);
|
|
return entry;
|
|
}
|
|
|
|
/* Since the DIO code tries to lock a wide area we need to look for any ordered
|
|
* extents that exist in the range, rather than just the start of the range.
|
|
*/
|
|
struct btrfs_ordered_extent *btrfs_lookup_ordered_range(
|
|
struct btrfs_inode *inode, u64 file_offset, u64 len)
|
|
{
|
|
struct btrfs_ordered_inode_tree *tree;
|
|
struct rb_node *node;
|
|
struct btrfs_ordered_extent *entry = NULL;
|
|
|
|
tree = &inode->ordered_tree;
|
|
spin_lock_irq(&tree->lock);
|
|
node = tree_search(tree, file_offset);
|
|
if (!node) {
|
|
node = tree_search(tree, file_offset + len);
|
|
if (!node)
|
|
goto out;
|
|
}
|
|
|
|
while (1) {
|
|
entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
|
|
if (range_overlaps(entry, file_offset, len))
|
|
break;
|
|
|
|
if (entry->file_offset >= file_offset + len) {
|
|
entry = NULL;
|
|
break;
|
|
}
|
|
entry = NULL;
|
|
node = rb_next(node);
|
|
if (!node)
|
|
break;
|
|
}
|
|
out:
|
|
if (entry)
|
|
refcount_inc(&entry->refs);
|
|
spin_unlock_irq(&tree->lock);
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* lookup and return any extent before 'file_offset'. NULL is returned
|
|
* if none is found
|
|
*/
|
|
struct btrfs_ordered_extent *
|
|
btrfs_lookup_first_ordered_extent(struct inode *inode, u64 file_offset)
|
|
{
|
|
struct btrfs_ordered_inode_tree *tree;
|
|
struct rb_node *node;
|
|
struct btrfs_ordered_extent *entry = NULL;
|
|
|
|
tree = &BTRFS_I(inode)->ordered_tree;
|
|
spin_lock_irq(&tree->lock);
|
|
node = tree_search(tree, file_offset);
|
|
if (!node)
|
|
goto out;
|
|
|
|
entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
|
|
refcount_inc(&entry->refs);
|
|
out:
|
|
spin_unlock_irq(&tree->lock);
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* search the ordered extents for one corresponding to 'offset' and
|
|
* try to find a checksum. This is used because we allow pages to
|
|
* be reclaimed before their checksum is actually put into the btree
|
|
*/
|
|
int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
|
|
u8 *sum, int len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_ordered_sum *ordered_sum;
|
|
struct btrfs_ordered_extent *ordered;
|
|
struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree;
|
|
unsigned long num_sectors;
|
|
unsigned long i;
|
|
u32 sectorsize = btrfs_inode_sectorsize(inode);
|
|
const u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
|
|
int index = 0;
|
|
|
|
ordered = btrfs_lookup_ordered_extent(inode, offset);
|
|
if (!ordered)
|
|
return 0;
|
|
|
|
spin_lock_irq(&tree->lock);
|
|
list_for_each_entry_reverse(ordered_sum, &ordered->list, list) {
|
|
if (disk_bytenr >= ordered_sum->bytenr &&
|
|
disk_bytenr < ordered_sum->bytenr + ordered_sum->len) {
|
|
i = (disk_bytenr - ordered_sum->bytenr) >>
|
|
inode->i_sb->s_blocksize_bits;
|
|
num_sectors = ordered_sum->len >>
|
|
inode->i_sb->s_blocksize_bits;
|
|
num_sectors = min_t(int, len - index, num_sectors - i);
|
|
memcpy(sum + index, ordered_sum->sums + i * csum_size,
|
|
num_sectors * csum_size);
|
|
|
|
index += (int)num_sectors * csum_size;
|
|
if (index == len)
|
|
goto out;
|
|
disk_bytenr += num_sectors * sectorsize;
|
|
}
|
|
}
|
|
out:
|
|
spin_unlock_irq(&tree->lock);
|
|
btrfs_put_ordered_extent(ordered);
|
|
return index;
|
|
}
|
|
|
|
/*
|
|
* btrfs_flush_ordered_range - Lock the passed range and ensures all pending
|
|
* ordered extents in it are run to completion.
|
|
*
|
|
* @inode: Inode whose ordered tree is to be searched
|
|
* @start: Beginning of range to flush
|
|
* @end: Last byte of range to lock
|
|
* @cached_state: If passed, will return the extent state responsible for the
|
|
* locked range. It's the caller's responsibility to free the cached state.
|
|
*
|
|
* This function always returns with the given range locked, ensuring after it's
|
|
* called no order extent can be pending.
|
|
*/
|
|
void btrfs_lock_and_flush_ordered_range(struct btrfs_inode *inode, u64 start,
|
|
u64 end,
|
|
struct extent_state **cached_state)
|
|
{
|
|
struct btrfs_ordered_extent *ordered;
|
|
struct extent_state *cache = NULL;
|
|
struct extent_state **cachedp = &cache;
|
|
|
|
if (cached_state)
|
|
cachedp = cached_state;
|
|
|
|
while (1) {
|
|
lock_extent_bits(&inode->io_tree, start, end, cachedp);
|
|
ordered = btrfs_lookup_ordered_range(inode, start,
|
|
end - start + 1);
|
|
if (!ordered) {
|
|
/*
|
|
* If no external cached_state has been passed then
|
|
* decrement the extra ref taken for cachedp since we
|
|
* aren't exposing it outside of this function
|
|
*/
|
|
if (!cached_state)
|
|
refcount_dec(&cache->refs);
|
|
break;
|
|
}
|
|
unlock_extent_cached(&inode->io_tree, start, end, cachedp);
|
|
btrfs_start_ordered_extent(&inode->vfs_inode, ordered, 1);
|
|
btrfs_put_ordered_extent(ordered);
|
|
}
|
|
}
|
|
|
|
int __init ordered_data_init(void)
|
|
{
|
|
btrfs_ordered_extent_cache = kmem_cache_create("btrfs_ordered_extent",
|
|
sizeof(struct btrfs_ordered_extent), 0,
|
|
SLAB_MEM_SPREAD,
|
|
NULL);
|
|
if (!btrfs_ordered_extent_cache)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void __cold ordered_data_exit(void)
|
|
{
|
|
kmem_cache_destroy(btrfs_ordered_extent_cache);
|
|
}
|