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doc: Explain that 'file-system' must refer to mapped devices by file name.

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* doc/guix.texi (File Systems): Clarify what to do when mapped devices
  are used.
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Ludovic Courtès 2014-11-30 18:29:13 +01:00
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commit 5f86a66efd
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doc/guix.texi
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@ -3731,6 +3731,13 @@ is interpreted as a partition label name; when it is @code{uuid},
The @code{label} and @code{uuid} options offer a way to refer to disk
partitions without having to hard-code their actual device name.
However, when a file system's source is a mapped device (@pxref{Mapped
Devices}), its @code{device} field @emph{must} refer to the mapped
device name---e.g., @file{/dev/mapper/root-partition}---and consequently
@code{title} must be set to @code{'device}. This is required so that
the system knows that mounting the file system depends on having the
corresponding device mapping established.
@item @code{flags} (default: @code{'()})
This is a list of symbols denoting mount flags. Recognized flags
include @code{read-only}, @code{bind-mount}, @code{no-dev} (disallow