[Cluster-devel] [PATCH v2 1/2] gfs2: Convert gfs2 to fs_context
Andrew Price
anprice at redhat.com
Tue Mar 19 17:53:07 UTC 2019
On 19/03/2019 17:05, David Howells wrote:
> Andrew Price <anprice at redhat.com> wrote:
>
>> + pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
>> + return -EINVAL;
>
> return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive");
Thanks.
>
> (Note: no "\n")
>
>> + if (result.int_32 > 0)
>> + args->ar_quota = opt_quota_values[result.int_32];
>> + else if (result.negated)
>> + args->ar_quota = GFS2_QUOTA_OFF;
>> + else
>> + args->ar_quota = GFS2_QUOTA_ON;
>
> I recommend checking result.negated first.
OK
>
>> + /* Not allowed to change locking details */
>> + if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto) ||
>> + strcmp(newargs->ar_locktable, oldargs->ar_locktable) ||
>> + strcmp(newargs->ar_hostdata, oldargs->ar_hostdata))
>> + return -EINVAL;
>
> Use errorf(). (Not invalf - the parameter isn't exactly invalid, it's just
> that you're not allowed to do this operation).
Yes, that makes more sense.
>> + error = gfs2_make_fs_ro(sdp);
>> + else
>> + error = gfs2_make_fs_rw(sdp);
>> + if (error)
>> + return error;
>
> Might want to call errorf() here too.
>
>> - s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags,
>> + s = sget(&gfs2_fs_type, test_meta_super, set_meta_super, flags,
>
> Try and use sget_fc() please.
That happens in patch 2/2 for gfs2meta. I might just roll both patches
together in v3 so there's no intermediate churn.
> If you look at the fuse patchset I cc'd you on,
> there's a commit there that adds a ->bdev and ->bdev_mode to fs_context that
> may be of use to you.
Yes, that looks useful - thanks.
> Can you use vfs_get_block_super()?
It might be possible if we can rearrange things so that this can be done
outside of the function:
if (args->ar_meta)
fc->root = dget(sdp->sd_master_dir);
else
fc->root = dget(sdp->sd_root_dir);
but we can't do that in our fill_super() because it needs to be selected
whether we have an existing mount or not.
> Would it be of use to export
> test_bdev_super_fc() and set_bdev_super_fc()?
There's only a little maintenance value in it, I think, but we could
certainly use them in gfs2 if we can't solve the fc->root selection issue.
Andy
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