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It is a memo for me because I am sometimes in the similar trouble.
My case
- The samba settings seem to be no problem with "testparm" command.
- If you just read files on Samba, it is "NT_STATUS_OK" in the log.smbd log, but if you try to write file on it, it will be "NT_STATUS_ACCESS_DENIED" and will not be able to write it.
- Samba directory permissions are also writeable and deletable.
It only appears to be Read-Only mode when accessing the filesystem via samba.
SELinux might prevent to write files. Check the SELinux. Just type "sestatus" on the command line. If you see "SELinux status: enabled", it is Bingo!
This is resolved by editing the following files and rebooting the server.
/etc/linux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
#SELINUX=enforcing
SELINUX=disabled
# SELINUXTYPE= can take one of these three values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
That's all. Enjoy!