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-rw-r--r--doc/guix.texi16
-rw-r--r--gnu/system.scm17
-rw-r--r--gnu/system/file-systems.scm5
3 files changed, 20 insertions, 18 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index aad201771a..9aeec41f83 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -3837,19 +3837,27 @@ detailed below.
Objects of this type represent device mappings that will be made when
the system boots up.
-@table @code
-@item source
+@table @asis
+@item @code{source}
This string specifies the name of the block device to be mapped, such as
@code{"/dev/sda3"}.
-@item target
+@item @code{target}
This string specifies the name of the mapping to be established. For
example, specifying @code{"my-partition"} will lead to the creation of
the @code{"/dev/mapper/my-partition"} device.
-@item type
+@item @code{type}
This must be a @code{mapped-device-kind} object, which specifies how
@var{source} is mapped to @var{target}.
+
+@item @code{needed-for-boot?} (default: @code{#f})
+This Boolean value indicates whether the device mapping must be made at
+boot time---i.e., from the initial RAM disk, before any user file
+systems are mounted.
+
+You would set it to @code{#t} for instance when the mapped device is
+used by the root file system.
@end table
@end deftp
diff --git a/gnu/system.scm b/gnu/system.scm
index e1ed1a2f19..731f9de55f 100644
--- a/gnu/system.scm
+++ b/gnu/system.scm
@@ -250,23 +250,14 @@ as 'needed-for-boot'."
(define (operating-system-user-mapped-devices os)
"Return the subset of mapped devices that can be installed in
user-land--i.e., those not needed during boot."
- (let ((devices (operating-system-mapped-devices os))
- (file-systems (operating-system-file-systems os)))
- (filter (lambda (md)
- (let ((user (mapped-device-user md file-systems)))
- (or (not user)
- (not (file-system-needed-for-boot? user)))))
- devices)))
+ (remove mapped-device-needed-for-boot?
+ (operating-system-mapped-devices os)))
(define (operating-system-boot-mapped-devices os)
"Return the subset of mapped devices that must be installed during boot,
from the initrd."
- (let ((devices (operating-system-mapped-devices os))
- (file-systems (operating-system-file-systems os)))
- (filter (lambda (md)
- (let ((user (mapped-device-user md file-systems)))
- (and user (file-system-needed-for-boot? user))))
- devices)))
+ (filter mapped-device-needed-for-boot?
+ (operating-system-mapped-devices os)))
(define (device-mapping-services os)
"Return the list of device-mapping services for OS as a monadic list."
diff --git a/gnu/system/file-systems.scm b/gnu/system/file-systems.scm
index 4760821840..356b4826b4 100644
--- a/gnu/system/file-systems.scm
+++ b/gnu/system/file-systems.scm
@@ -45,6 +45,7 @@
mapped-device-source
mapped-device-target
mapped-device-type
+ mapped-device-needed-for-boot?
mapped-device-kind
mapped-device-kind?
@@ -157,7 +158,9 @@ file system."
mapped-device?
(source mapped-device-source) ;string
(target mapped-device-target) ;string
- (type mapped-device-type)) ;<mapped-device-kind>
+ (type mapped-device-type) ;<mapped-device-kind>
+ (needed-for-boot? mapped-device-needed-for-boot? ;Boolean
+ (default #f)))
(define-record-type* <mapped-device-type> mapped-device-kind
make-mapped-device-kind