On Tue, Oct 17, 2017 at 1:10 AM, charles zheng <czheng2@xxxxxx> wrote: > Hi Amir, > > Thanks for the prompt reply. The Linux distribution is RHEL 7.4 and > the kernel version is > 3.10.0-693.2.2.el7.x86_64 > > Following is the dmesg output > > --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > [ 1341.548099] TECH PREVIEW: Overlay filesystem may not be fully supported. > Please review provided documentation for limitations. > --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > > Following is the log message from /proc/self/mountinfo > > --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > 112 62 0:40 / /mnt/nfs rw,relatime shared:63 - nfs4 > 10.32.8.113:/var/nfs > rw,vers=4.1,rsize=524288,wsize=524288,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=10.32.8.113,local_lock=none,addr=10.32.8.113 > 113 62 0:39 / /home/czheng2/test/merged rw,relatime shared:65 - > overlay overlay > rw,lowerdir=/mnt/nfs/lower,upperdir=/home/czheng2/test/upper,workdir=/home/czheng2/test/work > --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > > I also tried on Fedora 26 with kernel version > 4.13.5-200.fc26.x86_64 > > I got same error, but this time, I cannot find overlay related log from dmesg > > Following is the log message from /proc/self/mountinfo > > --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > 202 66 0:54 / /mnt/nfs rw,relatime shared:145 - nfs4 > 192.168.10.123:/var/nfs > rw,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.10.123,local_lock=none,addr=192.168.10.123 > 205 84 0:47 / /home/zc/test/merged rw,relatime shared:152 - overlay > overlay rw,seclabel,lowerdir=/mnt/nfs/lower,upperdir=/home/zc/test/upper,workdir=/home/zc/test/work > --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > Since the error happens on such as old kernel as well as a new one, I suspect copy up fails on copying extended attributes of lower_dir. I suspect there are some NFS related xattr on lower dir? and perhaps those cannot be set on your upper fs? You did not reveal in mountinfo snippet what you local upper fs is and what mount options it uses. Please try to check if lower dir contains any xattr and if your upper fs supports xattr. Amir. > > On Mon, Oct 16, 2017 at 4:41 PM, Amir Goldstein <amir73il@xxxxxxxxx> wrote: >> On Mon, Oct 16, 2017 at 7:13 PM, charles zheng <czheng2@xxxxxx> wrote: >>> Hi Miklos, >>> >>> We are developing a docker related system that requires to union >>> directories on NFS and local filesystem. I successfully created a >>> overlayfs that has lower layer located on NFS and upper layer located >>> on the local file system. But when I tried to create new files in the >>> directory located on NFS, I got error message: "Operation not >>> supported". Does that mean I can not create new files inside the >>> directory located on NFS? But base on the documentation of overlayfs, >>> lower layer does not need to be writable. >>> >>> Steps to reproduce the problem are (/mnt/nfs is the NFS mount, >>> /home/zc is the local mount) >>> >>> 1. create directory "/mnt/nfs/lower/lower_dir" >>> >>> 2. create directories "/home/zc/upper/upper_dir", "/home/zc/work" and >>> "/home/zc/merged" >>> >>> 3. create overlayfs by running command >>> >>> mount -t overlay overlay -o\ >>> lowerdir=/mnt/nfs/lower,\ >>> upperdir=/home/zc/upper,\ >>> workdir=/home/zc/work \ >>> /home/zc/merged >>> >>> 4. Try to create new file "/merged/lower_dir/test.txt" and get error >>> message "Operation not supported" >>> >> >> Hi Charles, >> >> This should definitely work. >> Please specify with kernel version/commit you are testing with >> Please attach relevant overlayfs logs from dmesg when you get the >> error and from overlayfs mount time. >> Please attach content of /proc/self/mountinfo after overlay is mounted >> >> Thanks, >> Amir. -- To unsubscribe from this list: send the line "unsubscribe linux-unionfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
