Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx> --- Documentation/btrfstune.asciidoc | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/Documentation/btrfstune.asciidoc b/Documentation/btrfstune.asciidoc index 9620221..6927758 100644 --- a/Documentation/btrfstune.asciidoc +++ b/Documentation/btrfstune.asciidoc @@ -25,8 +25,22 @@ Enable extended inode refs. -x:: Enable skinny metadata extent refs. -f:: -Allow dangerous changes, e.g. clear the seeding flag. Make sure that you are -aware of the dangers. +Allow dangerous changes, e.g. clear the seeding flag or change fsid. Make sure +that you are aware of the dangers. +-u:: +Change fsid to a random generated UUID. +If there is a previous unfinished fsid change, it will continue the unfinished +fsid change. +-U <UUID>:: +Change fsid to <UUID>. +The <UUID> should be a 36 bytes string in `printf`(3) format +"%08x-%04x-%04x-%04x-%012x". +If there is a previous unfinished fsid change, it will only continue if the +<UUID> matches the unfinished one. + +WARNING: Canceling a running UUID progress will cause the filesystem unmountable. +To fix it, please rerun 'btrfstune -u' to restore the UUID and wait it complete. + When mounting the new device, btrfs will check whether the seeding flag is set when try to open seeding device. If the user clears the seeding flag of the -- 2.4.0 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
