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| author |   Paulo Alcantara <pc@cjr.nz> | 2021-11-03 13:53:29 -0300 |
|---|---|---|
| committer |   Steve French <stfrench@microsoft.com> | 2021-11-10 16:30:13 -0600 |
| commit | c88f7dcd6d6429197fc2fd87b54a894ffcd48e8e (patch) | |
| tree | 136540ddd261ef46cfcfe87b3bc9e47417b45324 /fs/cifs/smb2pdu.c | |
| parent | smb3: do not error on fsync when readonly (diff) | |
| download | linux-dev-c88f7dcd6d6429197fc2fd87b54a894ffcd48e8e.tar.xz linux-dev-c88f7dcd6d6429197fc2fd87b54a894ffcd48e8e.zip | |
cifs: support nested dfs links over reconnect
Mounting a dfs link that has nested links was already supported at
mount(2), so make it work over reconnect as well.
Make the following case work:
* mount //root/dfs/link /mnt -o ...
- final share: /server/share
* in server settings
- change target folder of /root/dfs/link3 to /server/share2
- change target folder of /root/dfs/link2 to /root/dfs/link3
- change target folder of /root/dfs/link to /root/dfs/link2
* mount -o remount,... /mnt
- refresh all dfs referrals
- mark current connection for failover
- cifs_reconnect() reconnects to root server
- tree_connect()
* checks that /root/dfs/link2 is a link, then chase it
* checks that root/dfs/link3 is a link, then chase it
* finally tree connect to /server/share2
If the mounted share is no longer accessible and a reconnect had been
triggered, the client will retry it from both last referral
path (/root/dfs/link3) and original referral path (/root/dfs/link).
Any new referral paths found while chasing dfs links over reconnect,
it will be updated to TCP_Server_Info::leaf_fullpath, accordingly.
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/smb2pdu.c')
| -rw-r--r-- | fs/cifs/smb2pdu.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 5034e53a49e7..b20398a8097d 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -155,7 +155,11 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon, if (tcon == NULL) return 0; - if (smb2_command == SMB2_TREE_CONNECT) + /* + * Need to also skip SMB2_IOCTL because it is used for checking nested dfs links in + * cifs_tree_connect(). + */ + if (smb2_command == SMB2_TREE_CONNECT || smb2_command == SMB2_IOCTL) return 0; if (tcon->tidStatus == CifsExiting) { |