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cifs: client: allow changing multichannel mount options on remount

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Previously, the client did not update a session's channel state when
multichannel or max_channels mount options were changed via remount.
This led to inconsistent behavior and prevented enabling or disabling
multichannel support without a full unmount/remount cycle.

Enable dynamic reconfiguration of multichannel and max_channels during
remount by:
- Introducing smb3_sync_ses_chan_max(), a centralized function for
  channel updates which synchronizes the session's channels with the
  updated configuration.
- Replacing cifs_disable_secondary_channels() with
  cifs_decrease_secondary_channels(), which accepts a disable_mchan
  flag to support multichannel disable when the server stops supporting
  multichannel.
- Updating remount logic to detect changes in multichannel or
  max_channels and trigger appropriate session/channel updates.

Current limitation:
- The query_interfaces worker runs even when max_channels=1 so that
  multichannel can be enabled later via remount without requiring an
  unmount. This is a temporary approach and may be refined in the
  future.

Users can safely modify multichannel and max_channels on an existing
mount. The client will correctly adjust the session's channel state to
match the new configuration, preserving durability where possible and
avoiding unnecessary disconnects.

Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Rajasi Mandal <rajasimandal@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Rajasi Mandal 2025-12-05 20:11:51 +00:00 • committed by Steve French
commit ef529f655a
5 changed files with 128 additions and 26 deletions
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