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* cifs: simplify SWN code with dummy funcs instead of ifdefsAurelien Aptel2021-04-251-0/+27
| | | | | | | | | | | | | | | | | | | | This commit doesn't change the logic of SWN. Add dummy implementation of SWN functions when SWN is disabled instead of using ifdef sections. The dummy functions get optimized out, this leads to clearer code and compile time type-checking regardless of config options with no runtime penalty. Leave the simple ifdefs section as-is. A single bitfield (bool foo:1) on its own will use up one int. Move tcon->use_witness out of ifdefs with the other tcon bitfields. Signed-off-by: Aurelien Aptel <aaptel@suse.com> Reviewed-by: Samuel Cabrero <scabrero@suse.de> Signed-off-by: Steve French <stfrench@microsoft.com>
* cifs: Send witness register messages to userspace daemon in echo taskSamuel Cabrero2020-12-141-0/+2
| | | | | | | | | If the daemon starts after mounting a share, or if it crashes, this provides a mechanism to register again. Signed-off-by: Samuel Cabrero <scabrero@suse.de> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com>
* cifs: Add witness information to debug data dumpSamuel Cabrero2020-12-141-0/+2
| | | | | | | | | | | | | + Indicate if witness feature is supported + Indicate if witness is used when dumping tcons + Dumps witness registrations. Example: Witness registrations: Id: 1 Refs: 1 Network name: 'fs.fover.ad'(y) Share name: 'share1'(y) \ Ip address: 192.168.103.200(n) Signed-off-by: Samuel Cabrero <scabrero@suse.de> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com>
* cifs: Set witness notification handler for messages from userspace daemonSamuel Cabrero2020-12-141-0/+4
| | | | | | | | | | | | | + Set a handler for the witness notification messages received from the userspace daemon. + Handle the resource state change notification. When the resource becomes unavailable or available set the tcp status to CifsNeedReconnect for all channels. Signed-off-by: Samuel Cabrero <scabrero@suse.de> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com>
* cifs: Send witness register and unregister commands to userspace daemonSamuel Cabrero2020-12-141-0/+17
+ Define the generic netlink family commands and message attributes to communicate with the userspace daemon + The register and unregister commands are sent when connecting or disconnecting a tree. The witness registration keeps a pointer to the tcon and has the same lifetime. + Each registration has an id allocated by an IDR. This id is sent to the userspace daemon in the register command, and will be included in the notification messages from the userspace daemon to retrieve from the IDR the matching registration. + The authentication information is bundled in the register message. If kerberos is used the message just carries a flag. Signed-off-by: Samuel Cabrero <scabrero@suse.de> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com>