ubuntu 22.04 (ksmbd v3.4.2) , mount.cifs is ok, but some simple file io ops are failed?

[tojoyccnu]

Issue
See title, how can I get it correctly when using ksmbd. Just simple file ops would not be successful. ANY SUGGESTION or docs to follow。

Setup
linux version: ubuntu 22.04 kernel 5.15.0-87-generic
Version of kmod: ksmd ksmbd version : 3.4.2
Version of tools: git master

Expected behaviour
Files copy normally

I follow the ksmbs_tools 's step to share dictory, like below:
`
mkdir -vp $HOME/MyShare
sudo ksmbd.addshare --add
--option "path = $HOME/MyShare"
--option 'read only = no'
MyShare
sudo ksmbd.addshare --update MyShare

sudo ksmbd.adduser --add ubuntu

sudo ksmbd.addshare --update
--option "force user = $USER"
--option "force group = $USER"
MyShare
`

next, mount it normally.
sudo mount -o user=ubuntu //127.0.0.1/MyShare /mnt/smb
then, some file ops in the mountpoint /mnt/smb

sudo su root vim /mnt/smb/testfile01.txt // E667: Fsync failed echo "test" > /mnt/smb/testfile02.txt // no error occors, but file lenth is zero.

Why? How can I edit the ksmbd.conf, or update ksmbd version to newest version?

ksmbd.conf

`
[global]
; global parameters
bind interfaces only = no
deadtime = 0
guest account = nobody
ipc timeout = 0
map to guest = never
max active sessions = 1024
max connections = 128
max open files = 10000
netbios name = KSMBD SERVER
restrict anonymous = 0
server max protocol = SMB3_11
server min protocol = SMB2_10
server multi channel support = no
server signing = disabled
server string = SMB SERVER
share:fake_fscaps = 64
smb2 leases = no
smb2 max credits = 8192
smb2 max read = 4MB
smb2 max trans = 1MB
smb2 max write = 4MB
smb3 encryption = auto
smbd max io size = 8MB
tcp port = 445
workgroup = WORKGROUP
browseable = yes
create mask = 0744
crossmnt = yes
directory mask = 0755
force create mode = 0000
force directory mode = 0000
guest ok = no
hide dot files = yes
inherit owner = no
oplocks = yes

[public]
comment = share folder
browseable = yes
path = /home/ubuntu/MyShare
valid users = ubuntu
force user = ubuntu
public=yes
writeable=yes
available=yes

`

[namjaejeon]

ksmbd in linux-5.15 kernel seems to be unstable. Please use ksmbd in the latest kernel(6.5 or 6.6) or use github ksmbd(https://github.com/cifsd-team/ksmbd). Let me know if you find same issue on the latest ones.

[tojoyccnu]

ksmbd in linux-5.15 kernel seems to be unstable. Please use ksmbd in the latest kernel(6.5 or 6.6) or use github ksmbd(https://github.com/cifsd-team/ksmbd). Let me know if you find same issue on the latest ones.

@namjaejeon It works now, thanks.
I will try to test it over RDMA, using MT27800 Family [ConnectX-5] Mellanox Technologies. Did you tested that before?

[namjaejeon]

Did you tested that before?

@tojoyccnu I don't have all kinds of RDMA NICs. I have tested only ConnectX-3 Mellanox and a Chelsio NIC. There will not be some problem.

[namjaejeon]

@tojoyccnu And you need to add "server multi channel support = yes" parameter in [global] section of ksmbd.conf. Without this, RDMA will not work with windows client.

[tojoyccnu]

@namjaejeon Has the latest version of ksmbd (git master) been tested for compatibility with Linux kernel 6.6.0?

compile occors errors, like below:

./include/linux/fs.h:3016:43: note: expected ‘u32’ {aka ‘unsigned int’} but argument is of type ‘struct inode *’
3016 | void generic_fillattr(struct mnt_idmap *, u32, struct inode *, struct kstat *);
| ^~~
fs/smb/server/smb2pdu.c:5037:52: error: passing argument 3 of ‘generic_fillattr’ from incompatible pointer type [-Werror=incompatible-pointer-types]
5037 | generic_fillattr(file_mnt_idmap(fp->filp), inode, &stat);

fs/smb/server/smb2pdu.c: In function ‘find_file_posix_info’:
fs/smb/server/smb2pdu.c:5170:35: error: ‘struct inode’ has no member named ‘i_ctime’; did you mean ‘i_atime’?
5170 | time = ksmbd_UnixTimeToNT(inode->i_ctime);

...
and so on.

[tojoyccnu]

Looks like the fix to this will be to use inode_get_ctime(i), and the appropriate setter function, for all of these places we have been accessing i->i_ctime directly。

linux 6.6.0 has changed arguments to function ‘generic_fillattr’.

@namjaejeon

[namjaejeon]

@tojoyccnu Yes, there is a change in vfs. I will call you after updating it tonight or tomorrow.

[namjaejeon]

@tojoyccnu Please check git clone https://github.com/namjaejeon/ksmbd

[tojoyccnu]

@namjaejeon Is there a configuration to configure the number of cpu cores used?

[namjaejeon]

@tojoyccnu No, there is no such configuration in ksmbd. nfs or samba has such options ?