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Btrfs: early fsync support

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-04-19 21:01:03 -04:00
committed by David Woodhouse
parent 7e38180e20
commit 8fd17795b2
7 changed files with 62 additions and 5 deletions
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25
fs/btrfs/transaction.c
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@@ -19,6 +19,7 @@ static void put_transaction(struct btrfs_transaction *transaction)
if (transaction->use_count == 0) {
WARN_ON(total_trans == 0);
total_trans--;
list_del_init(&transaction->list);
memset(transaction, 0, sizeof(*transaction));
kmem_cache_free(btrfs_transaction_cachep, transaction);
}
@@ -43,6 +44,7 @@ static int join_transaction(struct btrfs_root *root)
cur_trans->in_commit = 0;
cur_trans->use_count = 1;
cur_trans->commit_done = 0;
list_add_tail(&cur_trans->list, &root->fs_info->trans_list);
}
cur_trans->num_writers++;
return 0;
@@ -236,6 +238,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
{
int ret = 0;
struct btrfs_transaction *cur_trans;
struct btrfs_transaction *prev_trans = NULL;
struct list_head dirty_fs_roots;
DEFINE_WAIT(wait);
@@ -272,13 +275,29 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
BUG_ON(ret);
cur_trans = root->fs_info->running_transaction;
root->fs_info->running_transaction = NULL;
btrfs_set_super_generation(root->fs_info->disk_super,
root->fs_info->generation + 1);
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++;
}
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);
}
btrfs_set_super_generation(root->fs_info->disk_super,
cur_trans->transid);
BUG_ON(ret);
write_ctree_super(trans, root);
mutex_lock(&root->fs_info->fs_mutex);
btrfs_finish_extent_commit(trans, root);
mutex_lock(&root->fs_info->trans_mutex);
cur_trans->commit_done = 1;