[CI:DOCS] Add warning about --opts,o with mount's -o
Ref:
@@ -46,13 +46,16 @@ The `type` option sets the type of the filesystem to be mounted, and is equivale
The `device` option sets the device to be mounted, and is equivalent to the `device` argument to **mount(8)**.
The `copy` option enables copying files from the container image path where the mount is created to the newly created volume on the first run. `copy` is the default.
-The `o` option sets options for the mount, and is equivalent to the `-o` flag to **mount(8)** with these exceptions:
+The `o` option sets options for the mount, and is equivalent to the filesystem
+options (also `-o`) passed to **mount(8)** with the following exceptions:
- The `o` option supports `uid` and `gid` options to set the UID and GID of the created volume that are not normally supported by **mount(8)**.
- The `o` option supports the `size` option to set the maximum size of the created volume, the `inodes` option to set the maximum number of inodes for the volume and `noquota` to completely disable quota support even for tracking of disk usage. Currently these flags are only supported on "xfs" file system mounted with the `prjquota` flag described in the **xfs_quota(8)** man page.
- The `o` option supports using volume options other than the UID/GID options with the **local** driver and requires root privileges.
- The `o` options supports the `timeout` option which allows users to set a driver specific timeout in seconds before volume creation fails. For example, **--opts=o=timeout=10** sets a driver timeout of 10 seconds.
+***Note*** Do not confuse the `--opts,-o` create option with the `-o` mount option. For example, with `podman volume create`, use `-o=o=uid=1000` *not* `-o=uid=1000`.
+
For the **image** driver, the only supported option is `image`, which specifies the image the volume is based on.
This option is mandatory when using the **image** driver.
