On Tue, Aug 25, 2015 at 01:09:43PM -0400, Josef Bacik wrote:
> If we have an fsync at the same time in two seperate subvolumes we could end
> up
> with the tree log pointing at invalid blocks. We need to notice if our
> writeout
Mind to share more details of the problem?
Thanks,
-liubo
> failed in anyway, if it did then we need to do a full transaction commit and
> return an error on the subvolume that gave us the io error. Thanks,
>
> Signed-off-by: Josef Bacik <jba...@fb.com>
> ---
> fs/btrfs/file.c | 4 ++++
> fs/btrfs/tree-log.c | 4 ++++
> 2 files changed, 8 insertions(+)
>
> diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
> index b823fac..c8f49f5 100644
> --- a/fs/btrfs/file.c
> +++ b/fs/btrfs/file.c
> @@ -2054,6 +2054,10 @@ int btrfs_sync_file(struct file *file, loff_t start,
> loff_t end, int datasync)
> if (!ret) {
> ret = btrfs_end_transaction(trans, root);
> goto out;
> + } else if (ctx.io_err) {
> + btrfs_end_transaction(trans, root);
> + ret = ctx.io_err;
> + goto out;
> }
> }
> if (!full_sync) {
> diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
> index 1bbaace..b4f15f5 100644
> --- a/fs/btrfs/tree-log.c
> +++ b/fs/btrfs/tree-log.c
> @@ -2857,6 +2857,10 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
> ret = btrfs_wait_marked_extents(log, &log->dirty_log_pages,
> mark);
> btrfs_wait_logged_extents(trans, log, log_transid);
> + if (ret) {
> + btrfs_set_log_full_commit(root->fs_info, trans);
> + ctx->io_err = ret;
> + }
> wait_log_commit(log_root_tree,
> root_log_ctx.log_transid);
> mutex_unlock(&log_root_tree->log_mutex);
> --
> 2.1.0
>
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