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system: vm: Remove unused variable.

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This is a followup to 05a9d1f378, which
removed its sole user.

* gnu/system/vm.scm (%linux-vm-file-systems): Remove.
(mapping->file-system): Add comment about “cache=loose”.
This commit is contained in:
Ludovic Courtès 2023-09-20 21:57:33 +02:00
parent dfaeaae9c7
commit f5c3f8e59e
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1 changed files with 6 additions and 35 deletions
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41
gnu/system/vm.scm
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@ -87,41 +87,6 @@ (define-module (gnu system vm)
;; conservative default.
(define %default-msize-value (* 100 (expt 2 20))) ;100 MiB
(define %linux-vm-file-systems
;; File systems mounted for 'derivation-in-linux-vm'. These are shared with
;; the host over 9p.
;;
;; The 9p documentation says that cache=loose is "intended for exclusive,
;; read-only mounts", without additional details. It's much faster than the
;; default cache=none, especially when copying and registering store items.
;; Thus, use cache=loose, except for /xchg where we want to ensure
;; consistency.
(list (file-system
(mount-point (%store-prefix))
(device "store")
(type "9p")
(needed-for-boot? #t)
(flags '(read-only))
(options (format #f "trans=virtio,cache=loose,msize=~a"
%default-msize-value))
(check? #f))
(file-system
(mount-point "/xchg")
(device "xchg")
(type "9p")
(needed-for-boot? #t)
(options (format #f "trans=virtio,msize=~a" %default-msize-value))
(check? #f))
(file-system
(mount-point "/tmp")
(device "tmp")
(type "9p")
(needed-for-boot? #t)
(options (format #f "trans=virtio,cache=loose,msize=~a"
%default-msize-value))
(check? #f))))
;;;
;;; VMs that share file systems with the host.
;;;
@ -145,6 +110,12 @@ (define (mapping->file-system mapping)
(device (file-system->mount-tag source))
(type "9p")
(flags (if writable? '() '(read-only)))
;; The 9p documentation says that cache=loose is "intended for
;; exclusive, read-only mounts", without additional details. It's
;; faster than the default cache=none, especially when copying and
;; registering store items. Thus, use cache=loose, except for writable
;; mounts, to ensure consistency.
(options (string-append "trans=virtio"
(if writable? "" ",cache=loose")
",msize=" (number->string %default-msize-value)))