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![Nikolay Borisov](/assets/img/avatar_default.png)
Calling btrfs_qgroup_reserve_meta_prealloc from btrfs_delayed_inode_reserve_metadata can result in flushing delalloc while holding a transaction and delayed node locks. This is deadlock prone. In the past multiple commits: *ae5e070eac
("btrfs: qgroup: don't try to wait flushing if we're already holding a transaction") *6f23277a49
("btrfs: qgroup: don't commit transaction when we already hold the handle") Tried to solve various aspects of this but this was always a whack-a-mole game. Unfortunately those 2 fixes don't solve a deadlock scenario involving btrfs_delayed_node::mutex. Namely, one thread can call btrfs_dirty_inode as a result of reading a file and modifying its atime: PID: 6963 TASK: ffff8c7f3f94c000 CPU: 2 COMMAND: "test" #0 __schedule at ffffffffa529e07d #1 schedule at ffffffffa529e4ff #2 schedule_timeout at ffffffffa52a1bdd #3 wait_for_completion at ffffffffa529eeea <-- sleeps with delayed node mutex held #4 start_delalloc_inodes at ffffffffc0380db5 #5 btrfs_start_delalloc_snapshot at ffffffffc0393836 #6 try_flush_qgroup at ffffffffc03f04b2 #7 __btrfs_qgroup_reserve_meta at ffffffffc03f5bb6 <-- tries to reserve space and starts delalloc inodes. #8 btrfs_delayed_update_inode at ffffffffc03e31aa <-- acquires delayed node mutex #9 btrfs_update_inode at ffffffffc0385ba8 #10 btrfs_dirty_inode at ffffffffc038627b <-- TRANSACTIION OPENED #11 touch_atime at ffffffffa4cf0000 #12 generic_file_read_iter at ffffffffa4c1f123 #13 new_sync_read at ffffffffa4ccdc8a #14 vfs_read at ffffffffa4cd0849 #15 ksys_read at ffffffffa4cd0bd1 #16 do_syscall_64 at ffffffffa4a052eb #17 entry_SYSCALL_64_after_hwframe at ffffffffa540008c This will cause an asynchronous work to flush the delalloc inodes to happen which can try to acquire the same delayed_node mutex: PID: 455 TASK: ffff8c8085fa4000 CPU: 5 COMMAND: "kworker/u16:30" #0 __schedule at ffffffffa529e07d #1 schedule at ffffffffa529e4ff #2 schedule_preempt_disabled at ffffffffa529e80a #3 __mutex_lock at ffffffffa529fdcb <-- goes to sleep, never wakes up. #4 btrfs_delayed_update_inode at ffffffffc03e3143 <-- tries to acquire the mutex #5 btrfs_update_inode at ffffffffc0385ba8 <-- this is the same inode that pid 6963 is holding #6 cow_file_range_inline.constprop.78 at ffffffffc0386be7 #7 cow_file_range at ffffffffc03879c1 #8 btrfs_run_delalloc_range at ffffffffc038894c #9 writepage_delalloc at ffffffffc03a3c8f #10 __extent_writepage at ffffffffc03a4c01 #11 extent_write_cache_pages at ffffffffc03a500b #12 extent_writepages at ffffffffc03a6de2 #13 do_writepages at ffffffffa4c277eb #14 __filemap_fdatawrite_range at ffffffffa4c1e5bb #15 btrfs_run_delalloc_work at ffffffffc0380987 <-- starts running delayed nodes #16 normal_work_helper at ffffffffc03b706c #17 process_one_work at ffffffffa4aba4e4 #18 worker_thread at ffffffffa4aba6fd #19 kthread at ffffffffa4ac0a3d #20 ret_from_fork at ffffffffa54001ff To fully address those cases the complete fix is to never issue any flushing while holding the transaction or the delayed node lock. This patch achieves it by calling qgroup_reserve_meta directly which will either succeed without flushing or will fail and return -EDQUOT. In the latter case that return value is going to be propagated to btrfs_dirty_inode which will fallback to start a new transaction. That's fine as the majority of time we expect the inode will have BTRFS_DELAYED_NODE_INODE_DIRTY flag set which will result in directly copying the in-memory state. Fixes:c53e965360
("btrfs: qgroup: try to flush qgroup space when we get -EDQUOT") CC: stable@vger.kernel.org # 5.10+ Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
1989 lines
52 KiB
C
1989 lines
52 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2011 Fujitsu. All rights reserved.
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* Written by Miao Xie <miaox@cn.fujitsu.com>
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*/
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#include <linux/slab.h>
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#include <linux/iversion.h>
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#include <linux/sched/mm.h>
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#include "misc.h"
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#include "delayed-inode.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "ctree.h"
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#include "qgroup.h"
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#include "locking.h"
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#define BTRFS_DELAYED_WRITEBACK 512
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#define BTRFS_DELAYED_BACKGROUND 128
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#define BTRFS_DELAYED_BATCH 16
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static struct kmem_cache *delayed_node_cache;
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int __init btrfs_delayed_inode_init(void)
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{
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delayed_node_cache = kmem_cache_create("btrfs_delayed_node",
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sizeof(struct btrfs_delayed_node),
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0,
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SLAB_MEM_SPREAD,
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NULL);
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if (!delayed_node_cache)
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return -ENOMEM;
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return 0;
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}
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void __cold btrfs_delayed_inode_exit(void)
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{
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kmem_cache_destroy(delayed_node_cache);
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}
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static inline void btrfs_init_delayed_node(
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struct btrfs_delayed_node *delayed_node,
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struct btrfs_root *root, u64 inode_id)
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{
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delayed_node->root = root;
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delayed_node->inode_id = inode_id;
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refcount_set(&delayed_node->refs, 0);
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delayed_node->ins_root = RB_ROOT_CACHED;
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delayed_node->del_root = RB_ROOT_CACHED;
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mutex_init(&delayed_node->mutex);
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INIT_LIST_HEAD(&delayed_node->n_list);
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INIT_LIST_HEAD(&delayed_node->p_list);
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}
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static inline int btrfs_is_continuous_delayed_item(
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struct btrfs_delayed_item *item1,
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struct btrfs_delayed_item *item2)
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{
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if (item1->key.type == BTRFS_DIR_INDEX_KEY &&
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item1->key.objectid == item2->key.objectid &&
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item1->key.type == item2->key.type &&
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item1->key.offset + 1 == item2->key.offset)
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return 1;
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return 0;
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}
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static struct btrfs_delayed_node *btrfs_get_delayed_node(
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struct btrfs_inode *btrfs_inode)
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{
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struct btrfs_root *root = btrfs_inode->root;
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u64 ino = btrfs_ino(btrfs_inode);
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struct btrfs_delayed_node *node;
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node = READ_ONCE(btrfs_inode->delayed_node);
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if (node) {
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refcount_inc(&node->refs);
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return node;
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}
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spin_lock(&root->inode_lock);
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node = radix_tree_lookup(&root->delayed_nodes_tree, ino);
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if (node) {
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if (btrfs_inode->delayed_node) {
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refcount_inc(&node->refs); /* can be accessed */
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BUG_ON(btrfs_inode->delayed_node != node);
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spin_unlock(&root->inode_lock);
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return node;
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}
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/*
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* It's possible that we're racing into the middle of removing
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* this node from the radix tree. In this case, the refcount
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* was zero and it should never go back to one. Just return
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* NULL like it was never in the radix at all; our release
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* function is in the process of removing it.
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*
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* Some implementations of refcount_inc refuse to bump the
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* refcount once it has hit zero. If we don't do this dance
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* here, refcount_inc() may decide to just WARN_ONCE() instead
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* of actually bumping the refcount.
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*
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* If this node is properly in the radix, we want to bump the
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* refcount twice, once for the inode and once for this get
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* operation.
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*/
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if (refcount_inc_not_zero(&node->refs)) {
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refcount_inc(&node->refs);
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btrfs_inode->delayed_node = node;
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} else {
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node = NULL;
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}
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spin_unlock(&root->inode_lock);
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return node;
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}
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spin_unlock(&root->inode_lock);
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return NULL;
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}
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/* Will return either the node or PTR_ERR(-ENOMEM) */
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static struct btrfs_delayed_node *btrfs_get_or_create_delayed_node(
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struct btrfs_inode *btrfs_inode)
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{
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struct btrfs_delayed_node *node;
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struct btrfs_root *root = btrfs_inode->root;
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u64 ino = btrfs_ino(btrfs_inode);
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int ret;
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again:
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node = btrfs_get_delayed_node(btrfs_inode);
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if (node)
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return node;
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node = kmem_cache_zalloc(delayed_node_cache, GFP_NOFS);
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if (!node)
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return ERR_PTR(-ENOMEM);
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btrfs_init_delayed_node(node, root, ino);
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/* cached in the btrfs inode and can be accessed */
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refcount_set(&node->refs, 2);
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ret = radix_tree_preload(GFP_NOFS);
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if (ret) {
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kmem_cache_free(delayed_node_cache, node);
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return ERR_PTR(ret);
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}
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spin_lock(&root->inode_lock);
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ret = radix_tree_insert(&root->delayed_nodes_tree, ino, node);
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if (ret == -EEXIST) {
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spin_unlock(&root->inode_lock);
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kmem_cache_free(delayed_node_cache, node);
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radix_tree_preload_end();
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goto again;
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}
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btrfs_inode->delayed_node = node;
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spin_unlock(&root->inode_lock);
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radix_tree_preload_end();
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return node;
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}
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/*
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* Call it when holding delayed_node->mutex
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*
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* If mod = 1, add this node into the prepared list.
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*/
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static void btrfs_queue_delayed_node(struct btrfs_delayed_root *root,
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struct btrfs_delayed_node *node,
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int mod)
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{
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spin_lock(&root->lock);
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if (test_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags)) {
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if (!list_empty(&node->p_list))
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list_move_tail(&node->p_list, &root->prepare_list);
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else if (mod)
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list_add_tail(&node->p_list, &root->prepare_list);
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} else {
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list_add_tail(&node->n_list, &root->node_list);
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list_add_tail(&node->p_list, &root->prepare_list);
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refcount_inc(&node->refs); /* inserted into list */
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root->nodes++;
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set_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags);
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}
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spin_unlock(&root->lock);
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}
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/* Call it when holding delayed_node->mutex */
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static void btrfs_dequeue_delayed_node(struct btrfs_delayed_root *root,
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struct btrfs_delayed_node *node)
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{
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spin_lock(&root->lock);
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if (test_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags)) {
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root->nodes--;
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refcount_dec(&node->refs); /* not in the list */
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list_del_init(&node->n_list);
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if (!list_empty(&node->p_list))
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list_del_init(&node->p_list);
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clear_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags);
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}
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spin_unlock(&root->lock);
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}
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static struct btrfs_delayed_node *btrfs_first_delayed_node(
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struct btrfs_delayed_root *delayed_root)
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{
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struct list_head *p;
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struct btrfs_delayed_node *node = NULL;
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spin_lock(&delayed_root->lock);
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if (list_empty(&delayed_root->node_list))
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goto out;
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p = delayed_root->node_list.next;
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node = list_entry(p, struct btrfs_delayed_node, n_list);
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refcount_inc(&node->refs);
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out:
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spin_unlock(&delayed_root->lock);
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return node;
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}
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static struct btrfs_delayed_node *btrfs_next_delayed_node(
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struct btrfs_delayed_node *node)
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{
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struct btrfs_delayed_root *delayed_root;
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struct list_head *p;
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struct btrfs_delayed_node *next = NULL;
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delayed_root = node->root->fs_info->delayed_root;
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spin_lock(&delayed_root->lock);
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if (!test_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags)) {
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/* not in the list */
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if (list_empty(&delayed_root->node_list))
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goto out;
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p = delayed_root->node_list.next;
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} else if (list_is_last(&node->n_list, &delayed_root->node_list))
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goto out;
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else
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p = node->n_list.next;
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next = list_entry(p, struct btrfs_delayed_node, n_list);
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refcount_inc(&next->refs);
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out:
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spin_unlock(&delayed_root->lock);
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return next;
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}
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static void __btrfs_release_delayed_node(
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struct btrfs_delayed_node *delayed_node,
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int mod)
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{
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struct btrfs_delayed_root *delayed_root;
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if (!delayed_node)
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return;
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delayed_root = delayed_node->root->fs_info->delayed_root;
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mutex_lock(&delayed_node->mutex);
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if (delayed_node->count)
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btrfs_queue_delayed_node(delayed_root, delayed_node, mod);
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else
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btrfs_dequeue_delayed_node(delayed_root, delayed_node);
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mutex_unlock(&delayed_node->mutex);
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if (refcount_dec_and_test(&delayed_node->refs)) {
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struct btrfs_root *root = delayed_node->root;
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spin_lock(&root->inode_lock);
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/*
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* Once our refcount goes to zero, nobody is allowed to bump it
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* back up. We can delete it now.
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*/
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ASSERT(refcount_read(&delayed_node->refs) == 0);
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radix_tree_delete(&root->delayed_nodes_tree,
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delayed_node->inode_id);
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spin_unlock(&root->inode_lock);
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kmem_cache_free(delayed_node_cache, delayed_node);
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}
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}
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static inline void btrfs_release_delayed_node(struct btrfs_delayed_node *node)
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{
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__btrfs_release_delayed_node(node, 0);
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}
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static struct btrfs_delayed_node *btrfs_first_prepared_delayed_node(
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struct btrfs_delayed_root *delayed_root)
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{
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struct list_head *p;
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struct btrfs_delayed_node *node = NULL;
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spin_lock(&delayed_root->lock);
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if (list_empty(&delayed_root->prepare_list))
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goto out;
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p = delayed_root->prepare_list.next;
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list_del_init(p);
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node = list_entry(p, struct btrfs_delayed_node, p_list);
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refcount_inc(&node->refs);
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out:
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spin_unlock(&delayed_root->lock);
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return node;
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}
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static inline void btrfs_release_prepared_delayed_node(
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struct btrfs_delayed_node *node)
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{
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__btrfs_release_delayed_node(node, 1);
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}
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static struct btrfs_delayed_item *btrfs_alloc_delayed_item(u32 data_len)
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{
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struct btrfs_delayed_item *item;
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item = kmalloc(sizeof(*item) + data_len, GFP_NOFS);
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if (item) {
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item->data_len = data_len;
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item->ins_or_del = 0;
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item->bytes_reserved = 0;
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item->delayed_node = NULL;
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refcount_set(&item->refs, 1);
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}
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return item;
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}
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/*
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* __btrfs_lookup_delayed_item - look up the delayed item by key
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* @delayed_node: pointer to the delayed node
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* @key: the key to look up
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* @prev: used to store the prev item if the right item isn't found
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* @next: used to store the next item if the right item isn't found
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*
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* Note: if we don't find the right item, we will return the prev item and
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* the next item.
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*/
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static struct btrfs_delayed_item *__btrfs_lookup_delayed_item(
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struct rb_root *root,
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struct btrfs_key *key,
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struct btrfs_delayed_item **prev,
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struct btrfs_delayed_item **next)
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{
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struct rb_node *node, *prev_node = NULL;
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struct btrfs_delayed_item *delayed_item = NULL;
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int ret = 0;
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node = root->rb_node;
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while (node) {
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delayed_item = rb_entry(node, struct btrfs_delayed_item,
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rb_node);
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prev_node = node;
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ret = btrfs_comp_cpu_keys(&delayed_item->key, key);
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if (ret < 0)
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node = node->rb_right;
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else if (ret > 0)
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node = node->rb_left;
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else
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return delayed_item;
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}
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if (prev) {
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if (!prev_node)
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*prev = NULL;
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else if (ret < 0)
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*prev = delayed_item;
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else if ((node = rb_prev(prev_node)) != NULL) {
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*prev = rb_entry(node, struct btrfs_delayed_item,
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rb_node);
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} else
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*prev = NULL;
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}
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if (next) {
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if (!prev_node)
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*next = NULL;
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else if (ret > 0)
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*next = delayed_item;
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else if ((node = rb_next(prev_node)) != NULL) {
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*next = rb_entry(node, struct btrfs_delayed_item,
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rb_node);
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} else
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*next = NULL;
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}
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return NULL;
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}
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static struct btrfs_delayed_item *__btrfs_lookup_delayed_insertion_item(
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struct btrfs_delayed_node *delayed_node,
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struct btrfs_key *key)
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{
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return __btrfs_lookup_delayed_item(&delayed_node->ins_root.rb_root, key,
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NULL, NULL);
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}
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static int __btrfs_add_delayed_item(struct btrfs_delayed_node *delayed_node,
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struct btrfs_delayed_item *ins,
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int action)
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{
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struct rb_node **p, *node;
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struct rb_node *parent_node = NULL;
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struct rb_root_cached *root;
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struct btrfs_delayed_item *item;
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int cmp;
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bool leftmost = true;
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if (action == BTRFS_DELAYED_INSERTION_ITEM)
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root = &delayed_node->ins_root;
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else if (action == BTRFS_DELAYED_DELETION_ITEM)
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root = &delayed_node->del_root;
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else
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BUG();
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p = &root->rb_root.rb_node;
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node = &ins->rb_node;
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while (*p) {
|
|
parent_node = *p;
|
|
item = rb_entry(parent_node, struct btrfs_delayed_item,
|
|
rb_node);
|
|
|
|
cmp = btrfs_comp_cpu_keys(&item->key, &ins->key);
|
|
if (cmp < 0) {
|
|
p = &(*p)->rb_right;
|
|
leftmost = false;
|
|
} else if (cmp > 0) {
|
|
p = &(*p)->rb_left;
|
|
} else {
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
|
|
rb_link_node(node, parent_node, p);
|
|
rb_insert_color_cached(node, root, leftmost);
|
|
ins->delayed_node = delayed_node;
|
|
ins->ins_or_del = action;
|
|
|
|
if (ins->key.type == BTRFS_DIR_INDEX_KEY &&
|
|
action == BTRFS_DELAYED_INSERTION_ITEM &&
|
|
ins->key.offset >= delayed_node->index_cnt)
|
|
delayed_node->index_cnt = ins->key.offset + 1;
|
|
|
|
delayed_node->count++;
|
|
atomic_inc(&delayed_node->root->fs_info->delayed_root->items);
|
|
return 0;
|
|
}
|
|
|
|
static int __btrfs_add_delayed_insertion_item(struct btrfs_delayed_node *node,
|
|
struct btrfs_delayed_item *item)
|
|
{
|
|
return __btrfs_add_delayed_item(node, item,
|
|
BTRFS_DELAYED_INSERTION_ITEM);
|
|
}
|
|
|
|
static int __btrfs_add_delayed_deletion_item(struct btrfs_delayed_node *node,
|
|
struct btrfs_delayed_item *item)
|
|
{
|
|
return __btrfs_add_delayed_item(node, item,
|
|
BTRFS_DELAYED_DELETION_ITEM);
|
|
}
|
|
|
|
static void finish_one_item(struct btrfs_delayed_root *delayed_root)
|
|
{
|
|
int seq = atomic_inc_return(&delayed_root->items_seq);
|
|
|
|
/* atomic_dec_return implies a barrier */
|
|
if ((atomic_dec_return(&delayed_root->items) <
|
|
BTRFS_DELAYED_BACKGROUND || seq % BTRFS_DELAYED_BATCH == 0))
|
|
cond_wake_up_nomb(&delayed_root->wait);
|
|
}
|
|
|
|
static void __btrfs_remove_delayed_item(struct btrfs_delayed_item *delayed_item)
|
|
{
|
|
struct rb_root_cached *root;
|
|
struct btrfs_delayed_root *delayed_root;
|
|
|
|
/* Not associated with any delayed_node */
|
|
if (!delayed_item->delayed_node)
|
|
return;
|
|
delayed_root = delayed_item->delayed_node->root->fs_info->delayed_root;
|
|
|
|
BUG_ON(!delayed_root);
|
|
BUG_ON(delayed_item->ins_or_del != BTRFS_DELAYED_DELETION_ITEM &&
|
|
delayed_item->ins_or_del != BTRFS_DELAYED_INSERTION_ITEM);
|
|
|
|
if (delayed_item->ins_or_del == BTRFS_DELAYED_INSERTION_ITEM)
|
|
root = &delayed_item->delayed_node->ins_root;
|
|
else
|
|
root = &delayed_item->delayed_node->del_root;
|
|
|
|
rb_erase_cached(&delayed_item->rb_node, root);
|
|
delayed_item->delayed_node->count--;
|
|
|
|
finish_one_item(delayed_root);
|
|
}
|
|
|
|
static void btrfs_release_delayed_item(struct btrfs_delayed_item *item)
|
|
{
|
|
if (item) {
|
|
__btrfs_remove_delayed_item(item);
|
|
if (refcount_dec_and_test(&item->refs))
|
|
kfree(item);
|
|
}
|
|
}
|
|
|
|
static struct btrfs_delayed_item *__btrfs_first_delayed_insertion_item(
|
|
struct btrfs_delayed_node *delayed_node)
|
|
{
|
|
struct rb_node *p;
|
|
struct btrfs_delayed_item *item = NULL;
|
|
|
|
p = rb_first_cached(&delayed_node->ins_root);
|
|
if (p)
|
|
item = rb_entry(p, struct btrfs_delayed_item, rb_node);
|
|
|
|
return item;
|
|
}
|
|
|
|
static struct btrfs_delayed_item *__btrfs_first_delayed_deletion_item(
|
|
struct btrfs_delayed_node *delayed_node)
|
|
{
|
|
struct rb_node *p;
|
|
struct btrfs_delayed_item *item = NULL;
|
|
|
|
p = rb_first_cached(&delayed_node->del_root);
|
|
if (p)
|
|
item = rb_entry(p, struct btrfs_delayed_item, rb_node);
|
|
|
|
return item;
|
|
}
|
|
|
|
static struct btrfs_delayed_item *__btrfs_next_delayed_item(
|
|
struct btrfs_delayed_item *item)
|
|
{
|
|
struct rb_node *p;
|
|
struct btrfs_delayed_item *next = NULL;
|
|
|
|
p = rb_next(&item->rb_node);
|
|
if (p)
|
|
next = rb_entry(p, struct btrfs_delayed_item, rb_node);
|
|
|
|
return next;
|
|
}
|
|
|
|
static int btrfs_delayed_item_reserve_metadata(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_delayed_item *item)
|
|
{
|
|
struct btrfs_block_rsv *src_rsv;
|
|
struct btrfs_block_rsv *dst_rsv;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
u64 num_bytes;
|
|
int ret;
|
|
|
|
if (!trans->bytes_reserved)
|
|
return 0;
|
|
|
|
src_rsv = trans->block_rsv;
|
|
dst_rsv = &fs_info->delayed_block_rsv;
|
|
|
|
num_bytes = btrfs_calc_insert_metadata_size(fs_info, 1);
|
|
|
|
/*
|
|
* Here we migrate space rsv from transaction rsv, since have already
|
|
* reserved space when starting a transaction. So no need to reserve
|
|
* qgroup space here.
|
|
*/
|
|
ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes, true);
|
|
if (!ret) {
|
|
trace_btrfs_space_reservation(fs_info, "delayed_item",
|
|
item->key.objectid,
|
|
num_bytes, 1);
|
|
item->bytes_reserved = num_bytes;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_delayed_item_release_metadata(struct btrfs_root *root,
|
|
struct btrfs_delayed_item *item)
|
|
{
|
|
struct btrfs_block_rsv *rsv;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
|
|
if (!item->bytes_reserved)
|
|
return;
|
|
|
|
rsv = &fs_info->delayed_block_rsv;
|
|
/*
|
|
* Check btrfs_delayed_item_reserve_metadata() to see why we don't need
|
|
* to release/reserve qgroup space.
|
|
*/
|
|
trace_btrfs_space_reservation(fs_info, "delayed_item",
|
|
item->key.objectid, item->bytes_reserved,
|
|
0);
|
|
btrfs_block_rsv_release(fs_info, rsv, item->bytes_reserved, NULL);
|
|
}
|
|
|
|
static int btrfs_delayed_inode_reserve_metadata(
|
|
struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_inode *inode,
|
|
struct btrfs_delayed_node *node)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_block_rsv *src_rsv;
|
|
struct btrfs_block_rsv *dst_rsv;
|
|
u64 num_bytes;
|
|
int ret;
|
|
|
|
src_rsv = trans->block_rsv;
|
|
dst_rsv = &fs_info->delayed_block_rsv;
|
|
|
|
num_bytes = btrfs_calc_metadata_size(fs_info, 1);
|
|
|
|
/*
|
|
* btrfs_dirty_inode will update the inode under btrfs_join_transaction
|
|
* which doesn't reserve space for speed. This is a problem since we
|
|
* still need to reserve space for this update, so try to reserve the
|
|
* space.
|
|
*
|
|
* Now if src_rsv == delalloc_block_rsv we'll let it just steal since
|
|
* we always reserve enough to update the inode item.
|
|
*/
|
|
if (!src_rsv || (!trans->bytes_reserved &&
|
|
src_rsv->type != BTRFS_BLOCK_RSV_DELALLOC)) {
|
|
ret = btrfs_qgroup_reserve_meta(root, num_bytes,
|
|
BTRFS_QGROUP_RSV_META_PREALLOC, true);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = btrfs_block_rsv_add(root, dst_rsv, num_bytes,
|
|
BTRFS_RESERVE_NO_FLUSH);
|
|
/*
|
|
* Since we're under a transaction reserve_metadata_bytes could
|
|
* try to commit the transaction which will make it return
|
|
* EAGAIN to make us stop the transaction we have, so return
|
|
* ENOSPC instead so that btrfs_dirty_inode knows what to do.
|
|
*/
|
|
if (ret == -EAGAIN) {
|
|
ret = -ENOSPC;
|
|
btrfs_qgroup_free_meta_prealloc(root, num_bytes);
|
|
}
|
|
if (!ret) {
|
|
node->bytes_reserved = num_bytes;
|
|
trace_btrfs_space_reservation(fs_info,
|
|
"delayed_inode",
|
|
btrfs_ino(inode),
|
|
num_bytes, 1);
|
|
} else {
|
|
btrfs_qgroup_free_meta_prealloc(root, num_bytes);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes, true);
|
|
if (!ret) {
|
|
trace_btrfs_space_reservation(fs_info, "delayed_inode",
|
|
btrfs_ino(inode), num_bytes, 1);
|
|
node->bytes_reserved = num_bytes;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_delayed_inode_release_metadata(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_delayed_node *node,
|
|
bool qgroup_free)
|
|
{
|
|
struct btrfs_block_rsv *rsv;
|
|
|
|
if (!node->bytes_reserved)
|
|
return;
|
|
|
|
rsv = &fs_info->delayed_block_rsv;
|
|
trace_btrfs_space_reservation(fs_info, "delayed_inode",
|
|
node->inode_id, node->bytes_reserved, 0);
|
|
btrfs_block_rsv_release(fs_info, rsv, node->bytes_reserved, NULL);
|
|
if (qgroup_free)
|
|
btrfs_qgroup_free_meta_prealloc(node->root,
|
|
node->bytes_reserved);
|
|
else
|
|
btrfs_qgroup_convert_reserved_meta(node->root,
|
|
node->bytes_reserved);
|
|
node->bytes_reserved = 0;
|
|
}
|
|
|
|
/*
|
|
* This helper will insert some continuous items into the same leaf according
|
|
* to the free space of the leaf.
|
|
*/
|
|
static int btrfs_batch_insert_items(struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_delayed_item *item)
|
|
{
|
|
struct btrfs_delayed_item *curr, *next;
|
|
int free_space;
|
|
int total_data_size = 0, total_size = 0;
|
|
struct extent_buffer *leaf;
|
|
char *data_ptr;
|
|
struct btrfs_key *keys;
|
|
u32 *data_size;
|
|
struct list_head head;
|
|
int slot;
|
|
int nitems;
|
|
int i;
|
|
int ret = 0;
|
|
|
|
BUG_ON(!path->nodes[0]);
|
|
|
|
leaf = path->nodes[0];
|
|
free_space = btrfs_leaf_free_space(leaf);
|
|
INIT_LIST_HEAD(&head);
|
|
|
|
next = item;
|
|
nitems = 0;
|
|
|
|
/*
|
|
* count the number of the continuous items that we can insert in batch
|
|
*/
|
|
while (total_size + next->data_len + sizeof(struct btrfs_item) <=
|
|
free_space) {
|
|
total_data_size += next->data_len;
|
|
total_size += next->data_len + sizeof(struct btrfs_item);
|
|
list_add_tail(&next->tree_list, &head);
|
|
nitems++;
|
|
|
|
curr = next;
|
|
next = __btrfs_next_delayed_item(curr);
|
|
if (!next)
|
|
break;
|
|
|
|
if (!btrfs_is_continuous_delayed_item(curr, next))
|
|
break;
|
|
}
|
|
|
|
if (!nitems) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
keys = kmalloc_array(nitems, sizeof(struct btrfs_key), GFP_NOFS);
|
|
if (!keys) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
data_size = kmalloc_array(nitems, sizeof(u32), GFP_NOFS);
|
|
if (!data_size) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
/* get keys of all the delayed items */
|
|
i = 0;
|
|
list_for_each_entry(next, &head, tree_list) {
|
|
keys[i] = next->key;
|
|
data_size[i] = next->data_len;
|
|
i++;
|
|
}
|
|
|
|
/* insert the keys of the items */
|
|
setup_items_for_insert(root, path, keys, data_size, nitems);
|
|
|
|
/* insert the dir index items */
|
|
slot = path->slots[0];
|
|
list_for_each_entry_safe(curr, next, &head, tree_list) {
|
|
data_ptr = btrfs_item_ptr(leaf, slot, char);
|
|
write_extent_buffer(leaf, &curr->data,
|
|
(unsigned long)data_ptr,
|
|
curr->data_len);
|
|
slot++;
|
|
|
|
btrfs_delayed_item_release_metadata(root, curr);
|
|
|
|
list_del(&curr->tree_list);
|
|
btrfs_release_delayed_item(curr);
|
|
}
|
|
|
|
error:
|
|
kfree(data_size);
|
|
kfree(keys);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This helper can just do simple insertion that needn't extend item for new
|
|
* data, such as directory name index insertion, inode insertion.
|
|
*/
|
|
static int btrfs_insert_delayed_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_delayed_item *delayed_item)
|
|
{
|
|
struct extent_buffer *leaf;
|
|
unsigned int nofs_flag;
|
|
char *ptr;
|
|
int ret;
|
|
|
|
nofs_flag = memalloc_nofs_save();
|
|
ret = btrfs_insert_empty_item(trans, root, path, &delayed_item->key,
|
|
delayed_item->data_len);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
if (ret < 0 && ret != -EEXIST)
|
|
return ret;
|
|
|
|
leaf = path->nodes[0];
|
|
|
|
ptr = btrfs_item_ptr(leaf, path->slots[0], char);
|
|
|
|
write_extent_buffer(leaf, delayed_item->data, (unsigned long)ptr,
|
|
delayed_item->data_len);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
btrfs_delayed_item_release_metadata(root, delayed_item);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* we insert an item first, then if there are some continuous items, we try
|
|
* to insert those items into the same leaf.
|
|
*/
|
|
static int btrfs_insert_delayed_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_path *path,
|
|
struct btrfs_root *root,
|
|
struct btrfs_delayed_node *node)
|
|
{
|
|
struct btrfs_delayed_item *curr, *prev;
|
|
int ret = 0;
|
|
|
|
do_again:
|
|
mutex_lock(&node->mutex);
|
|
curr = __btrfs_first_delayed_insertion_item(node);
|
|
if (!curr)
|
|
goto insert_end;
|
|
|
|
ret = btrfs_insert_delayed_item(trans, root, path, curr);
|
|
if (ret < 0) {
|
|
btrfs_release_path(path);
|
|
goto insert_end;
|
|
}
|
|
|
|
prev = curr;
|
|
curr = __btrfs_next_delayed_item(prev);
|
|
if (curr && btrfs_is_continuous_delayed_item(prev, curr)) {
|
|
/* insert the continuous items into the same leaf */
|
|
path->slots[0]++;
|
|
btrfs_batch_insert_items(root, path, curr);
|
|
}
|
|
btrfs_release_delayed_item(prev);
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
|
|
btrfs_release_path(path);
|
|
mutex_unlock(&node->mutex);
|
|
goto do_again;
|
|
|
|
insert_end:
|
|
mutex_unlock(&node->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_batch_delete_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_delayed_item *item)
|
|
{
|
|
struct btrfs_delayed_item *curr, *next;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key;
|
|
struct list_head head;
|
|
int nitems, i, last_item;
|
|
int ret = 0;
|
|
|
|
BUG_ON(!path->nodes[0]);
|
|
|
|
leaf = path->nodes[0];
|
|
|
|
i = path->slots[0];
|
|
last_item = btrfs_header_nritems(leaf) - 1;
|
|
if (i > last_item)
|
|
return -ENOENT; /* FIXME: Is errno suitable? */
|
|
|
|
next = item;
|
|
INIT_LIST_HEAD(&head);
|
|
btrfs_item_key_to_cpu(leaf, &key, i);
|
|
nitems = 0;
|
|
/*
|
|
* count the number of the dir index items that we can delete in batch
|
|
*/
|
|
while (btrfs_comp_cpu_keys(&next->key, &key) == 0) {
|
|
list_add_tail(&next->tree_list, &head);
|
|
nitems++;
|
|
|
|
curr = next;
|
|
next = __btrfs_next_delayed_item(curr);
|
|
if (!next)
|
|
break;
|
|
|
|
if (!btrfs_is_continuous_delayed_item(curr, next))
|
|
break;
|
|
|
|
i++;
|
|
if (i > last_item)
|
|
break;
|
|
btrfs_item_key_to_cpu(leaf, &key, i);
|
|
}
|
|
|
|
if (!nitems)
|
|
return 0;
|
|
|
|
ret = btrfs_del_items(trans, root, path, path->slots[0], nitems);
|
|
if (ret)
|
|
goto out;
|
|
|
|
list_for_each_entry_safe(curr, next, &head, tree_list) {
|
|
btrfs_delayed_item_release_metadata(root, curr);
|
|
list_del(&curr->tree_list);
|
|
btrfs_release_delayed_item(curr);
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_delete_delayed_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_path *path,
|
|
struct btrfs_root *root,
|
|
struct btrfs_delayed_node *node)
|
|
{
|
|
struct btrfs_delayed_item *curr, *prev;
|
|
unsigned int nofs_flag;
|
|
int ret = 0;
|
|
|
|
do_again:
|
|
mutex_lock(&node->mutex);
|
|
curr = __btrfs_first_delayed_deletion_item(node);
|
|
if (!curr)
|
|
goto delete_fail;
|
|
|
|
nofs_flag = memalloc_nofs_save();
|
|
ret = btrfs_search_slot(trans, root, &curr->key, path, -1, 1);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
if (ret < 0)
|
|
goto delete_fail;
|
|
else if (ret > 0) {
|
|
/*
|
|
* can't find the item which the node points to, so this node
|
|
* is invalid, just drop it.
|
|
*/
|
|
prev = curr;
|
|
curr = __btrfs_next_delayed_item(prev);
|
|
btrfs_release_delayed_item(prev);
|
|
ret = 0;
|
|
btrfs_release_path(path);
|
|
if (curr) {
|
|
mutex_unlock(&node->mutex);
|
|
goto do_again;
|
|
} else
|
|
goto delete_fail;
|
|
}
|
|
|
|
btrfs_batch_delete_items(trans, root, path, curr);
|
|
btrfs_release_path(path);
|
|
mutex_unlock(&node->mutex);
|
|
goto do_again;
|
|
|
|
delete_fail:
|
|
btrfs_release_path(path);
|
|
mutex_unlock(&node->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_release_delayed_inode(struct btrfs_delayed_node *delayed_node)
|
|
{
|
|
struct btrfs_delayed_root *delayed_root;
|
|
|
|
if (delayed_node &&
|
|
test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
|
|
BUG_ON(!delayed_node->root);
|
|
clear_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags);
|
|
delayed_node->count--;
|
|
|
|
delayed_root = delayed_node->root->fs_info->delayed_root;
|
|
finish_one_item(delayed_root);
|
|
}
|
|
}
|
|
|
|
static void btrfs_release_delayed_iref(struct btrfs_delayed_node *delayed_node)
|
|
{
|
|
struct btrfs_delayed_root *delayed_root;
|
|
|
|
ASSERT(delayed_node->root);
|
|
clear_bit(BTRFS_DELAYED_NODE_DEL_IREF, &delayed_node->flags);
|
|
delayed_node->count--;
|
|
|
|
delayed_root = delayed_node->root->fs_info->delayed_root;
|
|
finish_one_item(delayed_root);
|
|
}
|
|
|
|
static int __btrfs_update_delayed_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_delayed_node *node)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_key key;
|
|
struct btrfs_inode_item *inode_item;
|
|
struct extent_buffer *leaf;
|
|
unsigned int nofs_flag;
|
|
int mod;
|
|
int ret;
|
|
|
|
key.objectid = node->inode_id;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
|
|
if (test_bit(BTRFS_DELAYED_NODE_DEL_IREF, &node->flags))
|
|
mod = -1;
|
|
else
|
|
mod = 1;
|
|
|
|
nofs_flag = memalloc_nofs_save();
|
|
ret = btrfs_lookup_inode(trans, root, path, &key, mod);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
if (ret > 0) {
|
|
btrfs_release_path(path);
|
|
return -ENOENT;
|
|
} else if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
inode_item = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_inode_item);
|
|
write_extent_buffer(leaf, &node->inode_item, (unsigned long)inode_item,
|
|
sizeof(struct btrfs_inode_item));
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
if (!test_bit(BTRFS_DELAYED_NODE_DEL_IREF, &node->flags))
|
|
goto no_iref;
|
|
|
|
path->slots[0]++;
|
|
if (path->slots[0] >= btrfs_header_nritems(leaf))
|
|
goto search;
|
|
again:
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
if (key.objectid != node->inode_id)
|
|
goto out;
|
|
|
|
if (key.type != BTRFS_INODE_REF_KEY &&
|
|
key.type != BTRFS_INODE_EXTREF_KEY)
|
|
goto out;
|
|
|
|
/*
|
|
* Delayed iref deletion is for the inode who has only one link,
|
|
* so there is only one iref. The case that several irefs are
|
|
* in the same item doesn't exist.
|
|
*/
|
|
btrfs_del_item(trans, root, path);
|
|
out:
|
|
btrfs_release_delayed_iref(node);
|
|
no_iref:
|
|
btrfs_release_path(path);
|
|
err_out:
|
|
btrfs_delayed_inode_release_metadata(fs_info, node, (ret < 0));
|
|
btrfs_release_delayed_inode(node);
|
|
|
|
return ret;
|
|
|
|
search:
|
|
btrfs_release_path(path);
|
|
|
|
key.type = BTRFS_INODE_EXTREF_KEY;
|
|
key.offset = -1;
|
|
|
|
nofs_flag = memalloc_nofs_save();
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
if (ret < 0)
|
|
goto err_out;
|
|
ASSERT(ret);
|
|
|
|
ret = 0;
|
|
leaf = path->nodes[0];
|
|
path->slots[0]--;
|
|
goto again;
|
|
}
|
|
|
|
static inline int btrfs_update_delayed_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_delayed_node *node)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&node->mutex);
|
|
if (!test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &node->flags)) {
|
|
mutex_unlock(&node->mutex);
|
|
return 0;
|
|
}
|
|
|
|
ret = __btrfs_update_delayed_inode(trans, root, path, node);
|
|
mutex_unlock(&node->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static inline int
|
|
__btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_path *path,
|
|
struct btrfs_delayed_node *node)
|
|
{
|
|
int ret;
|
|
|
|
ret = btrfs_insert_delayed_items(trans, path, node->root, node);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = btrfs_delete_delayed_items(trans, path, node->root, node);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = btrfs_update_delayed_inode(trans, node->root, path, node);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Called when committing the transaction.
|
|
* Returns 0 on success.
|
|
* Returns < 0 on error and returns with an aborted transaction with any
|
|
* outstanding delayed items cleaned up.
|
|
*/
|
|
static int __btrfs_run_delayed_items(struct btrfs_trans_handle *trans, int nr)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_delayed_root *delayed_root;
|
|
struct btrfs_delayed_node *curr_node, *prev_node;
|
|
struct btrfs_path *path;
|
|
struct btrfs_block_rsv *block_rsv;
|
|
int ret = 0;
|
|
bool count = (nr > 0);
|
|
|
|
if (TRANS_ABORTED(trans))
|
|
return -EIO;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
block_rsv = trans->block_rsv;
|
|
trans->block_rsv = &fs_info->delayed_block_rsv;
|
|
|
|
delayed_root = fs_info->delayed_root;
|
|
|
|
curr_node = btrfs_first_delayed_node(delayed_root);
|
|
while (curr_node && (!count || nr--)) {
|
|
ret = __btrfs_commit_inode_delayed_items(trans, path,
|
|
curr_node);
|
|
if (ret) {
|
|
btrfs_release_delayed_node(curr_node);
|
|
curr_node = NULL;
|
|
btrfs_abort_transaction(trans, ret);
|
|
break;
|
|
}
|
|
|
|
prev_node = curr_node;
|
|
curr_node = btrfs_next_delayed_node(curr_node);
|
|
btrfs_release_delayed_node(prev_node);
|
|
}
|
|
|
|
if (curr_node)
|
|
btrfs_release_delayed_node(curr_node);
|
|
btrfs_free_path(path);
|
|
trans->block_rsv = block_rsv;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_run_delayed_items(struct btrfs_trans_handle *trans)
|
|
{
|
|
return __btrfs_run_delayed_items(trans, -1);
|
|
}
|
|
|
|
int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans, int nr)
|
|
{
|
|
return __btrfs_run_delayed_items(trans, nr);
|
|
}
|
|
|
|
int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
|
|
struct btrfs_path *path;
|
|
struct btrfs_block_rsv *block_rsv;
|
|
int ret;
|
|
|
|
if (!delayed_node)
|
|
return 0;
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
if (!delayed_node->count) {
|
|
mutex_unlock(&delayed_node->mutex);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return 0;
|
|
}
|
|
mutex_unlock(&delayed_node->mutex);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
block_rsv = trans->block_rsv;
|
|
trans->block_rsv = &delayed_node->root->fs_info->delayed_block_rsv;
|
|
|
|
ret = __btrfs_commit_inode_delayed_items(trans, path, delayed_node);
|
|
|
|
btrfs_release_delayed_node(delayed_node);
|
|
btrfs_free_path(path);
|
|
trans->block_rsv = block_rsv;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_commit_inode_delayed_inode(struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = inode->root->fs_info;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
|
|
struct btrfs_path *path;
|
|
struct btrfs_block_rsv *block_rsv;
|
|
int ret;
|
|
|
|
if (!delayed_node)
|
|
return 0;
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
if (!test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
|
|
mutex_unlock(&delayed_node->mutex);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return 0;
|
|
}
|
|
mutex_unlock(&delayed_node->mutex);
|
|
|
|
trans = btrfs_join_transaction(delayed_node->root);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
goto out;
|
|
}
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
goto trans_out;
|
|
}
|
|
|
|
block_rsv = trans->block_rsv;
|
|
trans->block_rsv = &fs_info->delayed_block_rsv;
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
if (test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags))
|
|
ret = __btrfs_update_delayed_inode(trans, delayed_node->root,
|
|
path, delayed_node);
|
|
else
|
|
ret = 0;
|
|
mutex_unlock(&delayed_node->mutex);
|
|
|
|
btrfs_free_path(path);
|
|
trans->block_rsv = block_rsv;
|
|
trans_out:
|
|
btrfs_end_transaction(trans);
|
|
btrfs_btree_balance_dirty(fs_info);
|
|
out:
|
|
btrfs_release_delayed_node(delayed_node);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_remove_delayed_node(struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node;
|
|
|
|
delayed_node = READ_ONCE(inode->delayed_node);
|
|
if (!delayed_node)
|
|
return;
|
|
|
|
inode->delayed_node = NULL;
|
|
btrfs_release_delayed_node(delayed_node);
|
|
}
|
|
|
|
struct btrfs_async_delayed_work {
|
|
struct btrfs_delayed_root *delayed_root;
|
|
int nr;
|
|
struct btrfs_work work;
|
|
};
|
|
|
|
static void btrfs_async_run_delayed_root(struct btrfs_work *work)
|
|
{
|
|
struct btrfs_async_delayed_work *async_work;
|
|
struct btrfs_delayed_root *delayed_root;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_path *path;
|
|
struct btrfs_delayed_node *delayed_node = NULL;
|
|
struct btrfs_root *root;
|
|
struct btrfs_block_rsv *block_rsv;
|
|
int total_done = 0;
|
|
|
|
async_work = container_of(work, struct btrfs_async_delayed_work, work);
|
|
delayed_root = async_work->delayed_root;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
goto out;
|
|
|
|
do {
|
|
if (atomic_read(&delayed_root->items) <
|
|
BTRFS_DELAYED_BACKGROUND / 2)
|
|
break;
|
|
|
|
delayed_node = btrfs_first_prepared_delayed_node(delayed_root);
|
|
if (!delayed_node)
|
|
break;
|
|
|
|
root = delayed_node->root;
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
btrfs_release_path(path);
|
|
btrfs_release_prepared_delayed_node(delayed_node);
|
|
total_done++;
|
|
continue;
|
|
}
|
|
|
|
block_rsv = trans->block_rsv;
|
|
trans->block_rsv = &root->fs_info->delayed_block_rsv;
|
|
|
|
__btrfs_commit_inode_delayed_items(trans, path, delayed_node);
|
|
|
|
trans->block_rsv = block_rsv;
|
|
btrfs_end_transaction(trans);
|
|
btrfs_btree_balance_dirty_nodelay(root->fs_info);
|
|
|
|
btrfs_release_path(path);
|
|
btrfs_release_prepared_delayed_node(delayed_node);
|
|
total_done++;
|
|
|
|
} while ((async_work->nr == 0 && total_done < BTRFS_DELAYED_WRITEBACK)
|
|
|| total_done < async_work->nr);
|
|
|
|
btrfs_free_path(path);
|
|
out:
|
|
wake_up(&delayed_root->wait);
|
|
kfree(async_work);
|
|
}
|
|
|
|
|
|
static int btrfs_wq_run_delayed_node(struct btrfs_delayed_root *delayed_root,
|
|
struct btrfs_fs_info *fs_info, int nr)
|
|
{
|
|
struct btrfs_async_delayed_work *async_work;
|
|
|
|
async_work = kmalloc(sizeof(*async_work), GFP_NOFS);
|
|
if (!async_work)
|
|
return -ENOMEM;
|
|
|
|
async_work->delayed_root = delayed_root;
|
|
btrfs_init_work(&async_work->work, btrfs_async_run_delayed_root, NULL,
|
|
NULL);
|
|
async_work->nr = nr;
|
|
|
|
btrfs_queue_work(fs_info->delayed_workers, &async_work->work);
|
|
return 0;
|
|
}
|
|
|
|
void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info)
|
|
{
|
|
WARN_ON(btrfs_first_delayed_node(fs_info->delayed_root));
|
|
}
|
|
|
|
static int could_end_wait(struct btrfs_delayed_root *delayed_root, int seq)
|
|
{
|
|
int val = atomic_read(&delayed_root->items_seq);
|
|
|
|
if (val < seq || val >= seq + BTRFS_DELAYED_BATCH)
|
|
return 1;
|
|
|
|
if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_delayed_root *delayed_root = fs_info->delayed_root;
|
|
|
|
if ((atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND) ||
|
|
btrfs_workqueue_normal_congested(fs_info->delayed_workers))
|
|
return;
|
|
|
|
if (atomic_read(&delayed_root->items) >= BTRFS_DELAYED_WRITEBACK) {
|
|
int seq;
|
|
int ret;
|
|
|
|
seq = atomic_read(&delayed_root->items_seq);
|
|
|
|
ret = btrfs_wq_run_delayed_node(delayed_root, fs_info, 0);
|
|
if (ret)
|
|
return;
|
|
|
|
wait_event_interruptible(delayed_root->wait,
|
|
could_end_wait(delayed_root, seq));
|
|
return;
|
|
}
|
|
|
|
btrfs_wq_run_delayed_node(delayed_root, fs_info, BTRFS_DELAYED_BATCH);
|
|
}
|
|
|
|
/* Will return 0 or -ENOMEM */
|
|
int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
|
|
const char *name, int name_len,
|
|
struct btrfs_inode *dir,
|
|
struct btrfs_disk_key *disk_key, u8 type,
|
|
u64 index)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node;
|
|
struct btrfs_delayed_item *delayed_item;
|
|
struct btrfs_dir_item *dir_item;
|
|
int ret;
|
|
|
|
delayed_node = btrfs_get_or_create_delayed_node(dir);
|
|
if (IS_ERR(delayed_node))
|
|
return PTR_ERR(delayed_node);
|
|
|
|
delayed_item = btrfs_alloc_delayed_item(sizeof(*dir_item) + name_len);
|
|
if (!delayed_item) {
|
|
ret = -ENOMEM;
|
|
goto release_node;
|
|
}
|
|
|
|
delayed_item->key.objectid = btrfs_ino(dir);
|
|
delayed_item->key.type = BTRFS_DIR_INDEX_KEY;
|
|
delayed_item->key.offset = index;
|
|
|
|
dir_item = (struct btrfs_dir_item *)delayed_item->data;
|
|
dir_item->location = *disk_key;
|
|
btrfs_set_stack_dir_transid(dir_item, trans->transid);
|
|
btrfs_set_stack_dir_data_len(dir_item, 0);
|
|
btrfs_set_stack_dir_name_len(dir_item, name_len);
|
|
btrfs_set_stack_dir_type(dir_item, type);
|
|
memcpy((char *)(dir_item + 1), name, name_len);
|
|
|
|
ret = btrfs_delayed_item_reserve_metadata(trans, dir->root, delayed_item);
|
|
/*
|
|
* we have reserved enough space when we start a new transaction,
|
|
* so reserving metadata failure is impossible
|
|
*/
|
|
BUG_ON(ret);
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
ret = __btrfs_add_delayed_insertion_item(delayed_node, delayed_item);
|
|
if (unlikely(ret)) {
|
|
btrfs_err(trans->fs_info,
|
|
"err add delayed dir index item(name: %.*s) into the insertion tree of the delayed node(root id: %llu, inode id: %llu, errno: %d)",
|
|
name_len, name, delayed_node->root->root_key.objectid,
|
|
delayed_node->inode_id, ret);
|
|
BUG();
|
|
}
|
|
mutex_unlock(&delayed_node->mutex);
|
|
|
|
release_node:
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_delete_delayed_insertion_item(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_delayed_node *node,
|
|
struct btrfs_key *key)
|
|
{
|
|
struct btrfs_delayed_item *item;
|
|
|
|
mutex_lock(&node->mutex);
|
|
item = __btrfs_lookup_delayed_insertion_item(node, key);
|
|
if (!item) {
|
|
mutex_unlock(&node->mutex);
|
|
return 1;
|
|
}
|
|
|
|
btrfs_delayed_item_release_metadata(node->root, item);
|
|
btrfs_release_delayed_item(item);
|
|
mutex_unlock(&node->mutex);
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *dir, u64 index)
|
|
{
|
|
struct btrfs_delayed_node *node;
|
|
struct btrfs_delayed_item *item;
|
|
struct btrfs_key item_key;
|
|
int ret;
|
|
|
|
node = btrfs_get_or_create_delayed_node(dir);
|
|
if (IS_ERR(node))
|
|
return PTR_ERR(node);
|
|
|
|
item_key.objectid = btrfs_ino(dir);
|
|
item_key.type = BTRFS_DIR_INDEX_KEY;
|
|
item_key.offset = index;
|
|
|
|
ret = btrfs_delete_delayed_insertion_item(trans->fs_info, node,
|
|
&item_key);
|
|
if (!ret)
|
|
goto end;
|
|
|
|
item = btrfs_alloc_delayed_item(0);
|
|
if (!item) {
|
|
ret = -ENOMEM;
|
|
goto end;
|
|
}
|
|
|
|
item->key = item_key;
|
|
|
|
ret = btrfs_delayed_item_reserve_metadata(trans, dir->root, item);
|
|
/*
|
|
* we have reserved enough space when we start a new transaction,
|
|
* so reserving metadata failure is impossible.
|
|
*/
|
|
if (ret < 0) {
|
|
btrfs_err(trans->fs_info,
|
|
"metadata reservation failed for delayed dir item deltiona, should have been reserved");
|
|
btrfs_release_delayed_item(item);
|
|
goto end;
|
|
}
|
|
|
|
mutex_lock(&node->mutex);
|
|
ret = __btrfs_add_delayed_deletion_item(node, item);
|
|
if (unlikely(ret)) {
|
|
btrfs_err(trans->fs_info,
|
|
"err add delayed dir index item(index: %llu) into the deletion tree of the delayed node(root id: %llu, inode id: %llu, errno: %d)",
|
|
index, node->root->root_key.objectid,
|
|
node->inode_id, ret);
|
|
btrfs_delayed_item_release_metadata(dir->root, item);
|
|
btrfs_release_delayed_item(item);
|
|
}
|
|
mutex_unlock(&node->mutex);
|
|
end:
|
|
btrfs_release_delayed_node(node);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_inode_delayed_dir_index_count(struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
|
|
|
|
if (!delayed_node)
|
|
return -ENOENT;
|
|
|
|
/*
|
|
* Since we have held i_mutex of this directory, it is impossible that
|
|
* a new directory index is added into the delayed node and index_cnt
|
|
* is updated now. So we needn't lock the delayed node.
|
|
*/
|
|
if (!delayed_node->index_cnt) {
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return -EINVAL;
|
|
}
|
|
|
|
inode->index_cnt = delayed_node->index_cnt;
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return 0;
|
|
}
|
|
|
|
bool btrfs_readdir_get_delayed_items(struct inode *inode,
|
|
struct list_head *ins_list,
|
|
struct list_head *del_list)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node;
|
|
struct btrfs_delayed_item *item;
|
|
|
|
delayed_node = btrfs_get_delayed_node(BTRFS_I(inode));
|
|
if (!delayed_node)
|
|
return false;
|
|
|
|
/*
|
|
* We can only do one readdir with delayed items at a time because of
|
|
* item->readdir_list.
|
|
*/
|
|
inode_unlock_shared(inode);
|
|
inode_lock(inode);
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
item = __btrfs_first_delayed_insertion_item(delayed_node);
|
|
while (item) {
|
|
refcount_inc(&item->refs);
|
|
list_add_tail(&item->readdir_list, ins_list);
|
|
item = __btrfs_next_delayed_item(item);
|
|
}
|
|
|
|
item = __btrfs_first_delayed_deletion_item(delayed_node);
|
|
while (item) {
|
|
refcount_inc(&item->refs);
|
|
list_add_tail(&item->readdir_list, del_list);
|
|
item = __btrfs_next_delayed_item(item);
|
|
}
|
|
mutex_unlock(&delayed_node->mutex);
|
|
/*
|
|
* This delayed node is still cached in the btrfs inode, so refs
|
|
* must be > 1 now, and we needn't check it is going to be freed
|
|
* or not.
|
|
*
|
|
* Besides that, this function is used to read dir, we do not
|
|
* insert/delete delayed items in this period. So we also needn't
|
|
* requeue or dequeue this delayed node.
|
|
*/
|
|
refcount_dec(&delayed_node->refs);
|
|
|
|
return true;
|
|
}
|
|
|
|
void btrfs_readdir_put_delayed_items(struct inode *inode,
|
|
struct list_head *ins_list,
|
|
struct list_head *del_list)
|
|
{
|
|
struct btrfs_delayed_item *curr, *next;
|
|
|
|
list_for_each_entry_safe(curr, next, ins_list, readdir_list) {
|
|
list_del(&curr->readdir_list);
|
|
if (refcount_dec_and_test(&curr->refs))
|
|
kfree(curr);
|
|
}
|
|
|
|
list_for_each_entry_safe(curr, next, del_list, readdir_list) {
|
|
list_del(&curr->readdir_list);
|
|
if (refcount_dec_and_test(&curr->refs))
|
|
kfree(curr);
|
|
}
|
|
|
|
/*
|
|
* The VFS is going to do up_read(), so we need to downgrade back to a
|
|
* read lock.
|
|
*/
|
|
downgrade_write(&inode->i_rwsem);
|
|
}
|
|
|
|
int btrfs_should_delete_dir_index(struct list_head *del_list,
|
|
u64 index)
|
|
{
|
|
struct btrfs_delayed_item *curr;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry(curr, del_list, readdir_list) {
|
|
if (curr->key.offset > index)
|
|
break;
|
|
if (curr->key.offset == index) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* btrfs_readdir_delayed_dir_index - read dir info stored in the delayed tree
|
|
*
|
|
*/
|
|
int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
|
|
struct list_head *ins_list)
|
|
{
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_delayed_item *curr, *next;
|
|
struct btrfs_key location;
|
|
char *name;
|
|
int name_len;
|
|
int over = 0;
|
|
unsigned char d_type;
|
|
|
|
if (list_empty(ins_list))
|
|
return 0;
|
|
|
|
/*
|
|
* Changing the data of the delayed item is impossible. So
|
|
* we needn't lock them. And we have held i_mutex of the
|
|
* directory, nobody can delete any directory indexes now.
|
|
*/
|
|
list_for_each_entry_safe(curr, next, ins_list, readdir_list) {
|
|
list_del(&curr->readdir_list);
|
|
|
|
if (curr->key.offset < ctx->pos) {
|
|
if (refcount_dec_and_test(&curr->refs))
|
|
kfree(curr);
|
|
continue;
|
|
}
|
|
|
|
ctx->pos = curr->key.offset;
|
|
|
|
di = (struct btrfs_dir_item *)curr->data;
|
|
name = (char *)(di + 1);
|
|
name_len = btrfs_stack_dir_name_len(di);
|
|
|
|
d_type = fs_ftype_to_dtype(di->type);
|
|
btrfs_disk_key_to_cpu(&location, &di->location);
|
|
|
|
over = !dir_emit(ctx, name, name_len,
|
|
location.objectid, d_type);
|
|
|
|
if (refcount_dec_and_test(&curr->refs))
|
|
kfree(curr);
|
|
|
|
if (over)
|
|
return 1;
|
|
ctx->pos++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void fill_stack_inode_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode_item *inode_item,
|
|
struct inode *inode)
|
|
{
|
|
btrfs_set_stack_inode_uid(inode_item, i_uid_read(inode));
|
|
btrfs_set_stack_inode_gid(inode_item, i_gid_read(inode));
|
|
btrfs_set_stack_inode_size(inode_item, BTRFS_I(inode)->disk_i_size);
|
|
btrfs_set_stack_inode_mode(inode_item, inode->i_mode);
|
|
btrfs_set_stack_inode_nlink(inode_item, inode->i_nlink);
|
|
btrfs_set_stack_inode_nbytes(inode_item, inode_get_bytes(inode));
|
|
btrfs_set_stack_inode_generation(inode_item,
|
|
BTRFS_I(inode)->generation);
|
|
btrfs_set_stack_inode_sequence(inode_item,
|
|
inode_peek_iversion(inode));
|
|
btrfs_set_stack_inode_transid(inode_item, trans->transid);
|
|
btrfs_set_stack_inode_rdev(inode_item, inode->i_rdev);
|
|
btrfs_set_stack_inode_flags(inode_item, BTRFS_I(inode)->flags);
|
|
btrfs_set_stack_inode_block_group(inode_item, 0);
|
|
|
|
btrfs_set_stack_timespec_sec(&inode_item->atime,
|
|
inode->i_atime.tv_sec);
|
|
btrfs_set_stack_timespec_nsec(&inode_item->atime,
|
|
inode->i_atime.tv_nsec);
|
|
|
|
btrfs_set_stack_timespec_sec(&inode_item->mtime,
|
|
inode->i_mtime.tv_sec);
|
|
btrfs_set_stack_timespec_nsec(&inode_item->mtime,
|
|
inode->i_mtime.tv_nsec);
|
|
|
|
btrfs_set_stack_timespec_sec(&inode_item->ctime,
|
|
inode->i_ctime.tv_sec);
|
|
btrfs_set_stack_timespec_nsec(&inode_item->ctime,
|
|
inode->i_ctime.tv_nsec);
|
|
|
|
btrfs_set_stack_timespec_sec(&inode_item->otime,
|
|
BTRFS_I(inode)->i_otime.tv_sec);
|
|
btrfs_set_stack_timespec_nsec(&inode_item->otime,
|
|
BTRFS_I(inode)->i_otime.tv_nsec);
|
|
}
|
|
|
|
int btrfs_fill_inode(struct inode *inode, u32 *rdev)
|
|
{
|
|
struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
|
|
struct btrfs_delayed_node *delayed_node;
|
|
struct btrfs_inode_item *inode_item;
|
|
|
|
delayed_node = btrfs_get_delayed_node(BTRFS_I(inode));
|
|
if (!delayed_node)
|
|
return -ENOENT;
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
if (!test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
|
|
mutex_unlock(&delayed_node->mutex);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return -ENOENT;
|
|
}
|
|
|
|
inode_item = &delayed_node->inode_item;
|
|
|
|
i_uid_write(inode, btrfs_stack_inode_uid(inode_item));
|
|
i_gid_write(inode, btrfs_stack_inode_gid(inode_item));
|
|
btrfs_i_size_write(BTRFS_I(inode), btrfs_stack_inode_size(inode_item));
|
|
btrfs_inode_set_file_extent_range(BTRFS_I(inode), 0,
|
|
round_up(i_size_read(inode), fs_info->sectorsize));
|
|
inode->i_mode = btrfs_stack_inode_mode(inode_item);
|
|
set_nlink(inode, btrfs_stack_inode_nlink(inode_item));
|
|
inode_set_bytes(inode, btrfs_stack_inode_nbytes(inode_item));
|
|
BTRFS_I(inode)->generation = btrfs_stack_inode_generation(inode_item);
|
|
BTRFS_I(inode)->last_trans = btrfs_stack_inode_transid(inode_item);
|
|
|
|
inode_set_iversion_queried(inode,
|
|
btrfs_stack_inode_sequence(inode_item));
|
|
inode->i_rdev = 0;
|
|
*rdev = btrfs_stack_inode_rdev(inode_item);
|
|
BTRFS_I(inode)->flags = btrfs_stack_inode_flags(inode_item);
|
|
|
|
inode->i_atime.tv_sec = btrfs_stack_timespec_sec(&inode_item->atime);
|
|
inode->i_atime.tv_nsec = btrfs_stack_timespec_nsec(&inode_item->atime);
|
|
|
|
inode->i_mtime.tv_sec = btrfs_stack_timespec_sec(&inode_item->mtime);
|
|
inode->i_mtime.tv_nsec = btrfs_stack_timespec_nsec(&inode_item->mtime);
|
|
|
|
inode->i_ctime.tv_sec = btrfs_stack_timespec_sec(&inode_item->ctime);
|
|
inode->i_ctime.tv_nsec = btrfs_stack_timespec_nsec(&inode_item->ctime);
|
|
|
|
BTRFS_I(inode)->i_otime.tv_sec =
|
|
btrfs_stack_timespec_sec(&inode_item->otime);
|
|
BTRFS_I(inode)->i_otime.tv_nsec =
|
|
btrfs_stack_timespec_nsec(&inode_item->otime);
|
|
|
|
inode->i_generation = BTRFS_I(inode)->generation;
|
|
BTRFS_I(inode)->index_cnt = (u64)-1;
|
|
|
|
mutex_unlock(&delayed_node->mutex);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node;
|
|
int ret = 0;
|
|
|
|
delayed_node = btrfs_get_or_create_delayed_node(inode);
|
|
if (IS_ERR(delayed_node))
|
|
return PTR_ERR(delayed_node);
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
if (test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
|
|
fill_stack_inode_item(trans, &delayed_node->inode_item,
|
|
&inode->vfs_inode);
|
|
goto release_node;
|
|
}
|
|
|
|
ret = btrfs_delayed_inode_reserve_metadata(trans, root, inode,
|
|
delayed_node);
|
|
if (ret)
|
|
goto release_node;
|
|
|
|
fill_stack_inode_item(trans, &delayed_node->inode_item, &inode->vfs_inode);
|
|
set_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags);
|
|
delayed_node->count++;
|
|
atomic_inc(&root->fs_info->delayed_root->items);
|
|
release_node:
|
|
mutex_unlock(&delayed_node->mutex);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_delayed_delete_inode_ref(struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = inode->root->fs_info;
|
|
struct btrfs_delayed_node *delayed_node;
|
|
|
|
/*
|
|
* we don't do delayed inode updates during log recovery because it
|
|
* leads to enospc problems. This means we also can't do
|
|
* delayed inode refs
|
|
*/
|
|
if (test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags))
|
|
return -EAGAIN;
|
|
|
|
delayed_node = btrfs_get_or_create_delayed_node(inode);
|
|
if (IS_ERR(delayed_node))
|
|
return PTR_ERR(delayed_node);
|
|
|
|
/*
|
|
* We don't reserve space for inode ref deletion is because:
|
|
* - We ONLY do async inode ref deletion for the inode who has only
|
|
* one link(i_nlink == 1), it means there is only one inode ref.
|
|
* And in most case, the inode ref and the inode item are in the
|
|
* same leaf, and we will deal with them at the same time.
|
|
* Since we are sure we will reserve the space for the inode item,
|
|
* it is unnecessary to reserve space for inode ref deletion.
|
|
* - If the inode ref and the inode item are not in the same leaf,
|
|
* We also needn't worry about enospc problem, because we reserve
|
|
* much more space for the inode update than it needs.
|
|
* - At the worst, we can steal some space from the global reservation.
|
|
* It is very rare.
|
|
*/
|
|
mutex_lock(&delayed_node->mutex);
|
|
if (test_bit(BTRFS_DELAYED_NODE_DEL_IREF, &delayed_node->flags))
|
|
goto release_node;
|
|
|
|
set_bit(BTRFS_DELAYED_NODE_DEL_IREF, &delayed_node->flags);
|
|
delayed_node->count++;
|
|
atomic_inc(&fs_info->delayed_root->items);
|
|
release_node:
|
|
mutex_unlock(&delayed_node->mutex);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return 0;
|
|
}
|
|
|
|
static void __btrfs_kill_delayed_node(struct btrfs_delayed_node *delayed_node)
|
|
{
|
|
struct btrfs_root *root = delayed_node->root;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_delayed_item *curr_item, *prev_item;
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
curr_item = __btrfs_first_delayed_insertion_item(delayed_node);
|
|
while (curr_item) {
|
|
btrfs_delayed_item_release_metadata(root, curr_item);
|
|
prev_item = curr_item;
|
|
curr_item = __btrfs_next_delayed_item(prev_item);
|
|
btrfs_release_delayed_item(prev_item);
|
|
}
|
|
|
|
curr_item = __btrfs_first_delayed_deletion_item(delayed_node);
|
|
while (curr_item) {
|
|
btrfs_delayed_item_release_metadata(root, curr_item);
|
|
prev_item = curr_item;
|
|
curr_item = __btrfs_next_delayed_item(prev_item);
|
|
btrfs_release_delayed_item(prev_item);
|
|
}
|
|
|
|
if (test_bit(BTRFS_DELAYED_NODE_DEL_IREF, &delayed_node->flags))
|
|
btrfs_release_delayed_iref(delayed_node);
|
|
|
|
if (test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
|
|
btrfs_delayed_inode_release_metadata(fs_info, delayed_node, false);
|
|
btrfs_release_delayed_inode(delayed_node);
|
|
}
|
|
mutex_unlock(&delayed_node->mutex);
|
|
}
|
|
|
|
void btrfs_kill_delayed_inode_items(struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node;
|
|
|
|
delayed_node = btrfs_get_delayed_node(inode);
|
|
if (!delayed_node)
|
|
return;
|
|
|
|
__btrfs_kill_delayed_node(delayed_node);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
}
|
|
|
|
void btrfs_kill_all_delayed_nodes(struct btrfs_root *root)
|
|
{
|
|
u64 inode_id = 0;
|
|
struct btrfs_delayed_node *delayed_nodes[8];
|
|
int i, n;
|
|
|
|
while (1) {
|
|
spin_lock(&root->inode_lock);
|
|
n = radix_tree_gang_lookup(&root->delayed_nodes_tree,
|
|
(void **)delayed_nodes, inode_id,
|
|
ARRAY_SIZE(delayed_nodes));
|
|
if (!n) {
|
|
spin_unlock(&root->inode_lock);
|
|
break;
|
|
}
|
|
|
|
inode_id = delayed_nodes[n - 1]->inode_id + 1;
|
|
for (i = 0; i < n; i++) {
|
|
/*
|
|
* Don't increase refs in case the node is dead and
|
|
* about to be removed from the tree in the loop below
|
|
*/
|
|
if (!refcount_inc_not_zero(&delayed_nodes[i]->refs))
|
|
delayed_nodes[i] = NULL;
|
|
}
|
|
spin_unlock(&root->inode_lock);
|
|
|
|
for (i = 0; i < n; i++) {
|
|
if (!delayed_nodes[i])
|
|
continue;
|
|
__btrfs_kill_delayed_node(delayed_nodes[i]);
|
|
btrfs_release_delayed_node(delayed_nodes[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_delayed_node *curr_node, *prev_node;
|
|
|
|
curr_node = btrfs_first_delayed_node(fs_info->delayed_root);
|
|
while (curr_node) {
|
|
__btrfs_kill_delayed_node(curr_node);
|
|
|
|
prev_node = curr_node;
|
|
curr_node = btrfs_next_delayed_node(curr_node);
|
|
btrfs_release_delayed_node(prev_node);
|
|
}
|
|
}
|
|
|