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Btrfs: crash recovery fixes

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-06-28 15:57:36 -04:00 • committed by David Woodhouse
parent f2654de42a
commit ccd467d60e
8 changed files with 112 additions and 48 deletions
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54
fs/btrfs/transaction.c
View file

@ -85,6 +85,8 @@ struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
if (root != root->fs_info->tree_root && root->last_trans <
running_trans_id) {
WARN_ON(root == root->fs_info->extent_root);
WARN_ON(root->ref_cows != 1);
if (root->root_item.refs != 0) {
radix_tree_tag_set(&root->fs_info->fs_roots_radix,
(unsigned long)root->root_key.objectid,
@ -113,10 +115,11 @@ int btrfs_end_transaction(struct btrfs_trans_handle *trans,
mutex_lock(&root->fs_info->trans_mutex);
cur_trans = root->fs_info->running_transaction;
WARN_ON(cur_trans != trans->transaction);
WARN_ON(cur_trans->num_writers < 1);
cur_trans->num_writers--;
if (waitqueue_active(&cur_trans->writer_wait))
wake_up(&cur_trans->writer_wait);
cur_trans->num_writers--;
put_transaction(cur_trans);
mutex_unlock(&root->fs_info->trans_mutex);
memset(trans, 0, sizeof(*trans));
@ -194,6 +197,7 @@ static int wait_for_commit(struct btrfs_root *root,
struct btrfs_transaction *commit)
{
DEFINE_WAIT(wait);
mutex_lock(&root->fs_info->trans_mutex);
while(!commit->commit_done) {
prepare_to_wait(&commit->commit_wait, &wait,
TASK_UNINTERRUPTIBLE);
@ -203,6 +207,7 @@ static int wait_for_commit(struct btrfs_root *root,
schedule();
mutex_lock(&root->fs_info->trans_mutex);
}
mutex_unlock(&root->fs_info->trans_mutex);
finish_wait(&commit->commit_wait, &wait);
return 0;
}
@ -279,7 +284,6 @@ static int add_dirty_roots(struct btrfs_trans_handle *trans,
&root->root_item);
if (err)
break;
refs = btrfs_root_refs(&tmp_item);
btrfs_set_root_refs(&tmp_item, refs - 1);
err = btrfs_update_root(trans, root->fs_info->tree_root,
@ -333,31 +337,53 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
struct btrfs_transaction *cur_trans;
struct btrfs_transaction *prev_trans = NULL;
struct list_head dirty_fs_roots;
struct radix_tree_root pinned_copy;
DEFINE_WAIT(wait);
init_bit_radix(&pinned_copy);
INIT_LIST_HEAD(&dirty_fs_roots);
mutex_lock(&root->fs_info->trans_mutex);
if (trans->transaction->in_commit) {
cur_trans = trans->transaction;
trans->transaction->use_count++;
mutex_unlock(&root->fs_info->trans_mutex);
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
ret = wait_for_commit(root, cur_trans);
BUG_ON(ret);
put_transaction(cur_trans);
mutex_unlock(&root->fs_info->trans_mutex);
mutex_lock(&root->fs_info->fs_mutex);
return 0;
}
cur_trans = trans->transaction;
trans->transaction->in_commit = 1;
cur_trans = trans->transaction;
if (cur_trans->list.prev != &root->fs_info->trans_list) {
prev_trans = list_entry(cur_trans->list.prev,
struct btrfs_transaction, list);
if (!prev_trans->commit_done) {
prev_trans->use_count++;
mutex_unlock(&root->fs_info->fs_mutex);
mutex_unlock(&root->fs_info->trans_mutex);
wait_for_commit(root, prev_trans);
put_transaction(prev_trans);
mutex_lock(&root->fs_info->fs_mutex);
mutex_lock(&root->fs_info->trans_mutex);
}
}
while (trans->transaction->num_writers > 1) {
WARN_ON(cur_trans != trans->transaction);
prepare_to_wait(&trans->transaction->writer_wait, &wait,
TASK_UNINTERRUPTIBLE);
if (trans->transaction->num_writers <= 1)
break;
mutex_unlock(&root->fs_info->fs_mutex);
mutex_unlock(&root->fs_info->trans_mutex);
schedule();
mutex_lock(&root->fs_info->fs_mutex);
mutex_lock(&root->fs_info->trans_mutex);
finish_wait(&trans->transaction->writer_wait, &wait);
}
@ -372,34 +398,22 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
cur_trans = root->fs_info->running_transaction;
root->fs_info->running_transaction = NULL;
if (cur_trans->list.prev != &root->fs_info->trans_list) {
prev_trans = list_entry(cur_trans->list.prev,
struct btrfs_transaction, list);
if (prev_trans->commit_done)
prev_trans = NULL;
else
prev_trans->use_count++;
}
btrfs_set_super_generation(&root->fs_info->super_copy,
cur_trans->transid);
btrfs_set_super_root(&root->fs_info->super_copy,
bh_blocknr(root->fs_info->tree_root->node));
memcpy(root->fs_info->disk_super, &root->fs_info->super_copy,
sizeof(root->fs_info->super_copy));
btrfs_copy_pinned(root, &pinned_copy);
mutex_unlock(&root->fs_info->trans_mutex);
mutex_unlock(&root->fs_info->fs_mutex);
ret = btrfs_write_and_wait_transaction(trans, root);
if (prev_trans) {
mutex_lock(&root->fs_info->trans_mutex);
wait_for_commit(root, prev_trans);
put_transaction(prev_trans);
mutex_unlock(&root->fs_info->trans_mutex);
}
BUG_ON(ret);
write_ctree_super(trans, root);
mutex_lock(&root->fs_info->fs_mutex);
btrfs_finish_extent_commit(trans, root);
btrfs_finish_extent_commit(trans, root, &pinned_copy);
mutex_lock(&root->fs_info->trans_mutex);
cur_trans->commit_done = 1;
wake_up(&cur_trans->commit_wait);