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-rw-r--r--gnu/build/file-systems.scm49
1 files changed, 47 insertions, 2 deletions
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm
index 13c44aa728..9299cc2e4c 100644
--- a/gnu/build/file-systems.scm
+++ b/gnu/build/file-systems.scm
@@ -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.
;;;
@@ -296,6 +297,45 @@ string. Trailing spaces are trimmed."
;;;
+;;; 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 @@ partition field reader that returned a value."
(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 @@ partition field reader that returned a value."
(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 @@ were found."
((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