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@@ -3325,6 +3325,18 @@ class Archiver:
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and not include any other contents of the containing folder, this can be enabled
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through using the ``--keep-exclude-tags`` option.
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+ The ``-x`` or ``--one-file-system`` option excludes directories, that are mountpoints (and everything in them).
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+ It detects mountpoints by comparing the device number from the output of ``stat()`` of the directory and its
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+ parent directory. Specifically, it excludes directories for which ``stat()`` reports a device number different
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+ from the device number of their parent. Be aware that in Linux (and possibly elsewhere) there are directories
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+ with device number different from their parent, which the kernel does not consider a mountpoint and also the
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+ other way around. Examples are bind mounts (possibly same device number, but always a mountpoint) and ALL
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+ subvolumes of a btrfs (different device number from parent but not necessarily a mountpoint). Therefore when
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+ using ``--one-file-system``, one should make doubly sure that the backup works as intended especially when using
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+ btrfs. This is even more important, if the btrfs layout was created by someone else, e.g. a distribution
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+ installer.
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+
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+
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.. _list_item_flags:
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Item flags
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@@ -3425,7 +3437,7 @@ class Archiver:
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fs_group = subparser.add_argument_group('Filesystem options')
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fs_group.add_argument('-x', '--one-file-system', dest='one_file_system', action='store_true',
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- help='stay in the same file system and do not store mount points of other file systems')
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+ help='stay in the same file system and do not store mount points of other file systems. This might behave different from your expectations, see the docs.')
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fs_group.add_argument('--numeric-owner', dest='numeric_owner', action='store_true',
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help='only store numeric user and group identifiers')
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fs_group.add_argument('--noatime', dest='noatime', action='store_true',
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