Traditionally, system administrators have used the iostat utility
to track the amount of io performed to a local disk filesystem.
Similar functionality is provided for NFS mounts via the nfsstat
utility that reads the NFS client's stats from /proc/pid/mountstats.
There is currently no good way for a system administrator or a
monitoring application inside a container to track the amount of io
performed via overlayfs.
Opt-in for generic io stats via /proc/pid/mountstats to provide
that functionality.
This feature depends on CONFIG_MOUNT_IO_STATS.
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
fs/overlayfs/super.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 7bb0a47cb615..802e4ed567cc 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -2165,7 +2165,7 @@ static struct dentry *ovl_mount(struct file_system_type *fs_type, int flags,
static struct file_system_type ovl_fs_type = {
.owner = THIS_MODULE,
.name = "overlay",
- .fs_flags = FS_USERNS_MOUNT,
+ .fs_flags = FS_USERNS_MOUNT | FS_MOUNT_STATS,
.mount = ovl_mount,
.kill_sb = kill_anon_super,
};
--
2.25.1
