From e5fd91f1ef340da553f7a79da9540c3db711c937 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Tue, 8 Sep 2015 01:01:14 -0300 Subject: Linux-libre 4.2-gnu --- fs/btrfs/disk-io.c | 113 ++++++++++++++++++++++++++++++++++++++--------------- 1 file changed, 82 insertions(+), 31 deletions(-) (limited to 'fs/btrfs/disk-io.c') diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 2ef9a4b72..f556c3732 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1149,12 +1149,12 @@ struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, buf = btrfs_find_create_tree_block(root, bytenr); if (!buf) - return NULL; + return ERR_PTR(-ENOMEM); ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); if (ret) { free_extent_buffer(buf); - return NULL; + return ERR_PTR(ret); } return buf; @@ -1509,20 +1509,19 @@ static struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, generation = btrfs_root_generation(&root->root_item); root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), generation); - if (!root->node) { - ret = -ENOMEM; + if (IS_ERR(root->node)) { + ret = PTR_ERR(root->node); goto find_fail; } else if (!btrfs_buffer_uptodate(root->node, generation, 0)) { ret = -EIO; - goto read_fail; + free_extent_buffer(root->node); + goto find_fail; } root->commit_root = btrfs_root_node(root); out: btrfs_free_path(path); return root; -read_fail: - free_extent_buffer(root->node); find_fail: kfree(root); alloc_fail: @@ -1745,13 +1744,14 @@ static void end_workqueue_fn(struct btrfs_work *work) bio->bi_private = end_io_wq->private; bio->bi_end_io = end_io_wq->end_io; kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq); - bio_endio_nodec(bio, error); + bio_endio(bio, error); } static int cleaner_kthread(void *arg) { struct btrfs_root *root = arg; int again; + struct btrfs_trans_handle *trans; do { again = 0; @@ -1773,7 +1773,6 @@ static int cleaner_kthread(void *arg) } btrfs_run_delayed_iputs(root); - btrfs_delete_unused_bgs(root->fs_info); again = btrfs_clean_one_deleted_snapshot(root); mutex_unlock(&root->fs_info->cleaner_mutex); @@ -1782,6 +1781,16 @@ static int cleaner_kthread(void *arg) * needn't do anything special here. */ btrfs_run_defrag_inodes(root->fs_info); + + /* + * Acquires fs_info->delete_unused_bgs_mutex to avoid racing + * with relocation (btrfs_relocate_chunk) and relocation + * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group) + * after acquiring fs_info->delete_unused_bgs_mutex. So we + * can't hold, nor need to, fs_info->cleaner_mutex when deleting + * unused block groups. + */ + btrfs_delete_unused_bgs(root->fs_info); sleep: if (!try_to_freeze() && !again) { set_current_state(TASK_INTERRUPTIBLE); @@ -1790,6 +1799,34 @@ sleep: __set_current_state(TASK_RUNNING); } } while (!kthread_should_stop()); + + /* + * Transaction kthread is stopped before us and wakes us up. + * However we might have started a new transaction and COWed some + * tree blocks when deleting unused block groups for example. So + * make sure we commit the transaction we started to have a clean + * shutdown when evicting the btree inode - if it has dirty pages + * when we do the final iput() on it, eviction will trigger a + * writeback for it which will fail with null pointer dereferences + * since work queues and other resources were already released and + * destroyed by the time the iput/eviction/writeback is made. + */ + trans = btrfs_attach_transaction(root); + if (IS_ERR(trans)) { + if (PTR_ERR(trans) != -ENOENT) + btrfs_err(root->fs_info, + "cleaner transaction attach returned %ld", + PTR_ERR(trans)); + } else { + int ret; + + ret = btrfs_commit_transaction(trans, root); + if (ret) + btrfs_err(root->fs_info, + "cleaner open transaction commit returned %d", + ret); + } + return 0; } @@ -2320,8 +2357,12 @@ static int btrfs_replay_log(struct btrfs_fs_info *fs_info, log_tree_root->node = read_tree_block(tree_root, bytenr, fs_info->generation + 1); - if (!log_tree_root->node || - !extent_buffer_uptodate(log_tree_root->node)) { + if (IS_ERR(log_tree_root->node)) { + printk(KERN_ERR "BTRFS: failed to read log tree\n"); + ret = PTR_ERR(log_tree_root->node); + kfree(log_tree_root); + return ret; + } else if (!extent_buffer_uptodate(log_tree_root->node)) { printk(KERN_ERR "BTRFS: failed to read log tree\n"); free_extent_buffer(log_tree_root->node); kfree(log_tree_root); @@ -2489,12 +2530,12 @@ int open_ctree(struct super_block *sb, spin_lock_init(&fs_info->unused_bgs_lock); rwlock_init(&fs_info->tree_mod_log_lock); mutex_init(&fs_info->unused_bg_unpin_mutex); + mutex_init(&fs_info->delete_unused_bgs_mutex); mutex_init(&fs_info->reloc_mutex); mutex_init(&fs_info->delalloc_root_mutex); seqlock_init(&fs_info->profiles_lock); init_rwsem(&fs_info->delayed_iput_sem); - init_completion(&fs_info->kobj_unregister); INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); INIT_LIST_HEAD(&fs_info->space_info); INIT_LIST_HEAD(&fs_info->tree_mod_seq_list); @@ -2797,10 +2838,11 @@ int open_ctree(struct super_block *sb, chunk_root->node = read_tree_block(chunk_root, btrfs_super_chunk_root(disk_super), generation); - if (!chunk_root->node || - !test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) { + if (IS_ERR(chunk_root->node) || + !extent_buffer_uptodate(chunk_root->node)) { printk(KERN_ERR "BTRFS: failed to read chunk root on %s\n", sb->s_id); + chunk_root->node = NULL; goto fail_tree_roots; } btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); @@ -2834,11 +2876,11 @@ retry_root_backup: tree_root->node = read_tree_block(tree_root, btrfs_super_root(disk_super), generation); - if (!tree_root->node || - !test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) { + if (IS_ERR(tree_root->node) || + !extent_buffer_uptodate(tree_root->node)) { printk(KERN_WARNING "BTRFS: failed to read tree root on %s\n", sb->s_id); - + tree_root->node = NULL; goto recovery_tree_root; } @@ -2874,10 +2916,22 @@ retry_root_backup: btrfs_close_extra_devices(fs_devices, 1); + ret = btrfs_sysfs_add_fsid(fs_devices, NULL); + if (ret) { + pr_err("BTRFS: failed to init sysfs fsid interface: %d\n", ret); + goto fail_block_groups; + } + + ret = btrfs_sysfs_add_device(fs_devices); + if (ret) { + pr_err("BTRFS: failed to init sysfs device interface: %d\n", ret); + goto fail_fsdev_sysfs; + } + ret = btrfs_sysfs_add_one(fs_info); if (ret) { pr_err("BTRFS: failed to init sysfs interface: %d\n", ret); - goto fail_block_groups; + goto fail_fsdev_sysfs; } ret = btrfs_init_space_info(fs_info); @@ -3055,6 +3109,9 @@ fail_cleaner: fail_sysfs: btrfs_sysfs_remove_one(fs_info); +fail_fsdev_sysfs: + btrfs_sysfs_remove_fsid(fs_info->fs_devices); + fail_block_groups: btrfs_put_block_group_cache(fs_info); btrfs_free_block_groups(fs_info); @@ -3269,11 +3326,8 @@ static int write_dev_supers(struct btrfs_device *device, */ static void btrfs_end_empty_barrier(struct bio *bio, int err) { - if (err) { - if (err == -EOPNOTSUPP) - set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); + if (err) clear_bit(BIO_UPTODATE, &bio->bi_flags); - } if (bio->bi_private) complete(bio->bi_private); bio_put(bio); @@ -3301,11 +3355,7 @@ static int write_dev_flush(struct btrfs_device *device, int wait) wait_for_completion(&device->flush_wait); - if (bio_flagged(bio, BIO_EOPNOTSUPP)) { - printk_in_rcu("BTRFS: disabling barriers on dev %s\n", - rcu_str_deref(device->name)); - device->nobarriers = 1; - } else if (!bio_flagged(bio, BIO_UPTODATE)) { + if (!bio_flagged(bio, BIO_UPTODATE)) { ret = -EIO; btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_FLUSH_ERRS); @@ -3732,6 +3782,7 @@ void close_ctree(struct btrfs_root *root) } btrfs_sysfs_remove_one(fs_info); + btrfs_sysfs_remove_fsid(fs_info->fs_devices); btrfs_free_fs_roots(fs_info); @@ -4060,6 +4111,7 @@ static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, while ((node = rb_first(&delayed_refs->href_root)) != NULL) { struct btrfs_delayed_ref_head *head; + struct btrfs_delayed_ref_node *tmp; bool pin_bytes = false; head = rb_entry(node, struct btrfs_delayed_ref_head, @@ -4075,11 +4127,10 @@ static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, continue; } spin_lock(&head->lock); - while ((node = rb_first(&head->ref_root)) != NULL) { - ref = rb_entry(node, struct btrfs_delayed_ref_node, - rb_node); + list_for_each_entry_safe_reverse(ref, tmp, &head->ref_list, + list) { ref->in_tree = 0; - rb_erase(&ref->rb_node, &head->ref_root); + list_del(&ref->list); atomic_dec(&delayed_refs->num_entries); btrfs_put_delayed_ref(ref); } -- cgit v1.2.3-54-g00ecf