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;
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:
{
struct btrfs_root *root = arg;
int again;
+ struct btrfs_trans_handle *trans;
do {
again = 0;
}
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);
* 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);
__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;
}
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);
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);
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);
goto fail_tree_roots;
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);
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);
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);
}
btrfs_sysfs_remove_one(fs_info);
+ btrfs_sysfs_remove_fsid(fs_info->fs_devices);
btrfs_free_fs_roots(fs_info);
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,
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);
}
projects / linux-drm-fsl-dcu.git / blobdiff