Created attachment 1722814 [details]
Description of problem:
There is a problem in FS_METHOD detection in wordpress which prevents enabling file mods. On fedora wp-content directory is read only for wordpress. FS_METHOD detection doesn't work with RO main directory. But if FS_METHOD is set to direct FILE_MODS can be enabled and they work.
I suggest patching default of FS_METHOD to direct to make file mods possible.
Thanks for the report with detailed information.
The patch is not corret, should be "direct", with quote.
Fixed by https://src.fedoraproject.org/rpms/wordpress/c/e2320b2e466a021186211df1645538dd97318fe4?branch=master
Notice, please check
Will be pushed in stable branches with next wordpress release