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btrfs-progs: document allowing duplicate fsid

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The commit ("btrfs-progs: allow duplicate fsid for single device
filesystems") lets the duplicate fsid used for a new mkfs document this.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2023-10-03 11:46:13 +08:00 committed by David Sterba
parent d71ece203a
commit b0c4dfaaac
2 changed files with 4 additions and 3 deletions
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5
Documentation/mkfs.btrfs.rst
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@ -179,8 +179,9 @@ OPTIONS
Resets any previous effects of *--verbose*.
-U|--uuid <UUID>
Create the filesystem with the given *UUID*. The UUID must not exist on any
filesystem currently present.
Create the filesystem with the given *UUID*. For a single-device filesystem,
you can duplicate the UUID. However, for a multi-device filesystem, the UUID
must not already exist on any currently present filesystem.
-v|--verbose
Increase verbosity level, default is 1.

2
mkfs/main.c
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@ -430,7 +430,7 @@ static const char * const mkfs_usage[] = {
OPTLINE("-s|--sectorsize SIZE", "data block size (may not be mountable by current kernel)"),
OPTLINE("-O|--features LIST", "comma separated list of filesystem features (use '-O list-all' to list features)"),
OPTLINE("-L|--label LABEL", "set the filesystem label"),
OPTLINE("-U|--uuid UUID", "specify the filesystem UUID (must be unique)"),
OPTLINE("-U|--uuid UUID", "specify the filesystem UUID (must be unique for a filesystem with multiple devices)"),
"Creation:",
OPTLINE("-b|--byte-count SIZE", "set size of each device to SIZE (filesystem size is sum of all device sizes)"),
OPTLINE("-r|--rootdir DIR", "copy files from DIR to the image root directory"),