Thanks, Steve. Given WannaCry (and its derivatives), many shops are disabling SMBv1 entirely (not necessarily a bad idea). Any idea as to when the aforementioned fixes might be pushed downstream? I've tested Ubuntu 17.04 with the same results (DFS fails with SMB > v1). Status code returned 0xc0000016 STATUS_MORE_PROCESSING_REQUIRED Status code returned 0xc0000257 STATUS_PATH_NOT_COVERED CIFS VFS: cifs_mount failed w/return code = -38 # uname -r 4.10.0-22-generic # modinfo cifs filename: /lib/modules/4.10.0-22-generic/kernel/fs/cifs/cifs.ko softdep: pre: ccm softdep: pre: aead2 softdep: pre: sha256 softdep: pre: cmac softdep: pre: aes softdep: pre: nls softdep: pre: md5 softdep: pre: md4 softdep: pre: hmac softdep: pre: ecb softdep: pre: des softdep: pre: arc4 version: 2.09 description: VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows license: GPL author: Steve French <sfrench@xxxxxxxxxx> alias: fs-cifs srcversion: 2EEBCAE8D1598E85D808811 depends: fscache intree: Y vermagic: 4.10.0-22-generic SMP mod_unload parm: CIFSMaxBufSize:Network buffer size (not including header). Default: 16384 Range: 8192 to 130048 (uint) parm: cifs_min_rcv:Network buffers in pool. Default: 4 Range: 1 to 64 (uint) parm: cifs_min_small:Small network buffers in pool. Default: 30 Range: 2 to 256 (uint) parm: cifs_max_pending:Simultaneous requests to server. Default: 32767 Range: 2 to 32767. (uint) parm: enable_oplocks:Enable or disable oplocks. Default: y/Y/1 (bool) On Thu, Apr 20, 2017 at 3:14 PM, Steve French <smfrench@xxxxxxxxx> wrote: > Fixes to add SMB2/SMB3 support for DFS were added fairly recently > (about two months ago) by Aurelien, so will be in new kernels. > > Hopefully RedHat and other will backport these as they are quite useful. > > On Thu, Apr 20, 2017 at 3:09 PM, Robin Blanchard > <robin.blanchard@xxxxxxxxx> wrote: >> environment: >> >> # cat /etc/redhat-release >> CentOS Linux release 7.3.1611 (Core) >> >> # uname -r >> 3.10.0-514.16.1.el7.x86_64 >> >> # modinfo cifs >> filename: /lib/modules/3.10.0-514.16.1.el7.x86_64/kernel/fs/cifs/cifs.ko >> version: 2.08 >> description: VFS to access servers complying with the SNIA CIFS >> Specification e.g. Samba and Windows >> license: GPL >> author: Steve French <sfrench@xxxxxxxxxx> >> alias: fs-cifs >> rhelversion: 7.3 >> srcversion: 119ACC0FE17824C08D648CE >> depends: dns_resolver >> intree: Y >> vermagic: 3.10.0-514.16.1.el7.x86_64 SMP mod_unload modversions >> signer: CentOS Linux kernel signing key >> sig_key: 3F:E1:EB:8B:4F:91:D4:84:CD:55:44:84:54:A0:24:DE:56:34:E1:06 >> sig_hashalgo: sha256 >> parm: CIFSMaxBufSize:Network buffer size (not including >> header). Default: 16384 Range: 8192 to 130048 (uint) >> parm: cifs_min_rcv:Network buffers in pool. Default: 4 >> Range: 1 to 64 (uint) >> parm: cifs_min_small:Small network buffers in pool. Default: >> 30 Range: 2 to 256 (uint) >> parm: cifs_max_pending:Simultaneous requests to server. >> Default: 32767 Range: 2 to 32767. (uint) >> parm: enable_oplocks:Enable or disable oplocks. Default: y/Y/1 (bool) >> >> >> >> issue: >> >> 01) smb vers=1.0 + DFS works as expected: >> >> # mount -v -t cifs //my.domain/dfs/path /mnt -o >> "ro,vers=1.0,domain=my.domain,username=silly_user" >> # echo $? >> 0 >> >> >> 02) smb vers=3.0 + DFS fails with: >> >> # echo 7 > /proc/fs/cifs/cifsFYI ; mount -v -t cifs >> //my.domain/dfs/path /mnt -o >> "ro,vers=3.0,domain=my.domain,username=silly_user"; sleep 5 ; echo 0 > >> /proc/fs/cifs/cifsFYI ; dmesg |tail -3 >> >> mount error(38): Function not implemented >> Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) >> [273116.707979] Status code returned 0xc0000016 STATUS_MORE_PROCESSING_REQUIRED >> [273116.712186] Status code returned 0xc0000257 STATUS_PATH_NOT_COVERED >> [273116.713723] CIFS VFS: cifs_mount failed w/return code = -38 >> >> >> 03) smb vers=3.0 w/o CFS works as expected >> >> # mount -v -t cifs //real.win2k12.server/non-dfs/path /mnt -o >> "ro,vers=3.0,domain=my.domain,username=silly_user >> # echo $? >> 0 >> >> >> >> Is there another incantation of mount -t cifs to get smbv3 + DFS >> working? Or is this a known issue (and if so, is there a work-around) >> ? >> >> Thanks in advance! >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-cifs" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > -- > Thanks, > > Steve -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
