The commit is pushed to "branch-rh9-5.14.vz9.1.x-ovz" and will appear at
https://src.openvz.org/scm/ovz/vzkernel.git
after ark-5.14
------>
commit 1d2a838ec24ab0f561d8e52b8eab5b3e9cd735bc
Author: Valeriy Vdovin <valeriy.vdo...@virtuozzo.com>
Date: Mon Oct 4 20:39:06 2021 +0300
configs: Set overlayfs nfs_export option to true
+CONFIG_OVERLAY_FS_INDEX=y
+CONFIG_OVERLAY_FS_NFS_EXPORT=y
Docker uses overlayfs. Lately, I've been testing checkpoint/restore of
fs notifications that were setup on top of overlayfs. I've found out
that criu is not able to dump opened file descriptors of fanotify when
nfs_export parameter is off.
The details of that problem: at checkpoint/dump criu wants to dump
fanotify fd and uses 'open_by_handle_at' with fhandle of the subject
descriptor. Kernel needs to decode fhandle to convert it to inode, for
that it uses mnt->mnt_sb->s_export_op->fh_to_dentry.
For overlayfs mount s_export_op is only filled with valid exportfs
function if nfs_export flag is true. nfs_export in its turn depends on
index=on option.
One way to enable them is to extend mount options with string
"nfs_export=on,index=on" during call to mount. Another way which we
discussed - is to tune defaults for both values to true.
https://jira.sw.ru/browse/PSBM-104961
Signed-off-by: Valeriy Vdovin <valeriy.vdo...@virtuozzo.com>
(cherry picked from vz8 commit 7fe31a28bad084949cd927fbce553d9152631e15)
Signed-off-by: Andrey Zhadchenko <andrey.zhadche...@virtuozzo.com>
---
redhat/configs/custom-overrides/generic/CONFIG_OVERLAY_FS_INDEX | 1 +
redhat/configs/custom-overrides/generic/CONFIG_OVERLAY_FS_NFS_EXPORT | 1 +
2 files changed, 2 insertions(+)
diff --git a/redhat/configs/custom-overrides/generic/CONFIG_OVERLAY_FS_INDEX
b/redhat/configs/custom-overrides/generic/CONFIG_OVERLAY_FS_INDEX
new file mode 100644
index 000000000000..c61cab2ace07
--- /dev/null
+++ b/redhat/configs/custom-overrides/generic/CONFIG_OVERLAY_FS_INDEX
@@ -0,0 +1 @@
+CONFIG_OVERLAY_FS_INDEX=y
diff --git
a/redhat/configs/custom-overrides/generic/CONFIG_OVERLAY_FS_NFS_EXPORT
b/redhat/configs/custom-overrides/generic/CONFIG_OVERLAY_FS_NFS_EXPORT
new file mode 100644
index 000000000000..a3fcd01173e6
--- /dev/null
+++ b/redhat/configs/custom-overrides/generic/CONFIG_OVERLAY_FS_NFS_EXPORT
@@ -0,0 +1 @@
+CONFIG_OVERLAY_FS_NFS_EXPORT=y
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