add boot params archisoflags= and cow_flags= for mount options

Having files on btrfs subvolumes requires to give mount options. Add
boot params archisoflags= and cow_flags= for this purpose. Boot
parameters could look like this:

... archisodevice=/dev/sdaX archisoflags=subvolume=isos
cow_device=/dev/sdaX cow_flags=subvolume=persist ...

Signed-off-by: Christian Hesse <mail@eworm.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/docs/README.bootparams b/docs/README.bootparams
index 356375d..9737554 100644
--- a/docs/README.bootparams
+++ b/docs/README.bootparams
@@ -21,6 +21,8 @@ INDEX
                     Default: (unset)
 * archisodevice=    Set the device node where archiso medium is located.
                     Default: "/dev/disk/by-label/${archisolabel}"
+* archisoflags=     Set extra mount options, e.g. for btrfs subvolumes.
+                    Default: defaults
 * archisobasedir=   Set the base directory where all files reside.
                     Default: "arch"
 * copytoram=        If set to "y" or just "copytoram" without arguments,
@@ -35,6 +37,8 @@ INDEX
                     Default: (unset)
 * cow_device=       Like cow_label= but using device node.
                     Default: (unset) or "/dev/disk/by-label/${cow_label}"
+* cow_flags=        Set extra mount options, e.g. for btrfs subvolumes.
+                    Default: defaults
 * cow_directory=    Set a directory inside ${cow_device}.
                     Default: "/persistent_${archisolabel}/${arch}"
 * cow_persistent=   Set if snapshot is persistent "P" or non-persistent "N".