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file-systems: Add support for JFS.

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* gnu/build/file-systems.scm (%jfs-endianness): New syntax.
(jfs-superblock?, read-jfs-superblock, jfs-superblock-uuid)
(jfs-superblock-volume-name, check-jfs-file-system): New procedures.
(%partition-label-readers, %partition-uuid-readers, check-file-system):
Register them.
This commit is contained in:
Tobias Geerinckx-Rice 2019-12-31 01:25:10 +01:00
parent 548d1f8861
commit 1abbe7c64b
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GPG key ID: D889B0F018C5493C
1 changed files with 47 additions and 2 deletions
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49
gnu/build/file-systems.scm
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@ -3,6 +3,7 @@
;;; Copyright © 2016, 2017 David Craven <david@craven.ch>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019 Guillaume Le Vaillant <glv@posteo.net>
;;; Copyright © 2019 Tobias Geerinckx-Rice <me@tobias.gr>
;;;
;;; This file is part of GNU Guix.
;;;
@ -294,6 +295,45 @@ (define (iso9660-superblock-volume-name sblock)
(string-trim-right (latin1->string (sub-bytevector sblock 40 32)
(lambda (c) #f)) #\space))
;;;
;;; JFS file systems.
;;;
;; Taken from <linux-libre>/fs/jfs/jfs_superblock.h.
(define-syntax %jfs-endianness
;; Endianness of JFS file systems.
(identifier-syntax (endianness little)))
(define (jfs-superblock? sblock)
"Return #t when SBLOCK is a JFS superblock."
(bytevector=? (sub-bytevector sblock 0 4)
(string->utf8 "JFS1")))
(define (read-jfs-superblock device)
"Return the raw contents of DEVICE's JFS superblock as a bytevector, or #f
if DEVICE does not contain a JFS file system."
(read-superblock device 32768 184 jfs-superblock?))
(define (jfs-superblock-uuid sblock)
"Return the UUID of JFS superblock SBLOCK as a 16-byte bytevector."
(sub-bytevector sblock 136 16))
(define (jfs-superblock-volume-name sblock)
"Return the volume name of SBLOCK as a string of at most 16 characters, or
#f if SBLOCK has no volume name."
(null-terminated-latin1->string (sub-bytevector sblock 152 16)))
(define (check-jfs-file-system device)
"Return the health of a JFS file system on DEVICE."
(match (status:exit-val
(system* "jfs_fsck" "-p" "-v" device))
(0 'pass)
(1 'errors-corrected)
(2 'reboot-required)
(_ 'fatal-error)))
;;;
;;; LUKS encrypted devices.
@ -420,7 +460,9 @@ (define %partition-label-readers
(partition-field-reader read-fat32-superblock
fat32-superblock-volume-name)
(partition-field-reader read-fat16-superblock
fat16-superblock-volume-name)))
fat16-superblock-volume-name)
(partition-field-reader read-jfs-superblock
jfs-superblock-volume-name)))
(define %partition-uuid-readers
(list (partition-field-reader read-iso9660-superblock
@ -432,7 +474,9 @@ (define %partition-uuid-readers
(partition-field-reader read-fat32-superblock
fat32-superblock-uuid)
(partition-field-reader read-fat16-superblock
fat16-superblock-uuid)))
fat16-superblock-uuid)
(partition-field-reader read-jfs-superblock
jfs-superblock-uuid)))
(define read-partition-label
(cut read-partition-field <> %partition-label-readers))
@ -527,6 +571,7 @@ (define check-procedure
((string-prefix? "ext" type) check-ext2-file-system)
((string-prefix? "btrfs" type) check-btrfs-file-system)
((string-suffix? "fat" type) check-fat-file-system)
((string-prefix? "jfs" type) check-jfs-file-system)
(else #f)))
(if check-procedure