Re: silent data loss with ext4 / all current versions

On Thu, Feb 4, 2016 at 12:02 PM, Michael Paquier
<michael(dot)paquier(at)gmail(dot)com> wrote:
> On Tue, Feb 2, 2016 at 4:20 PM, Michael Paquier wrote:
>> Not wrong, and this leads to the following:
>> void rename_safe(const char *old, const char *new, bool isdir, int elevel);
>> Controlling elevel is necessary per the multiple code paths that would
>> use it. Some use ERROR, most of them FATAL, and a bit of WARNING. Does
>> that look fine?
>
> After really coding it, I finished with the following thing:
> +int
> +rename_safe(const char *old, const char *new)
>
> There is no need to extend that for directories, well we could of
> course but all the renames happen on files so I see no need to make
> that more complicated. More refactoring of the other rename() calls
> could be done as well by extending rename_safe() with a flag to fsync
> the data within a critical section, particularly for the replication
> slot code. I have let that out to not complicate more the patch.

Andres just poked me (2m far from each other now) regarding the fact
that we should fsync even after the link() calls when
HAVE_WORKING_LINK is used. So we could lose some meta data here. Mea
culpa. And the patch misses that.
--
Michael