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file-systems: Add 'cleanly-unmounted-ext2?'.

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* gnu/build/file-systems.scm (ext2-superblock-cleanly-unmounted?)
(cleanly-unmounted-ext2?): New procedures.
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Ludovic Courtès 2022-07-01 09:44:04 +02:00
parent 2199af9f7b
commit 4636640de8
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1 changed files with 24 additions and 0 deletions
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24
gnu/build/file-systems.scm
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@ -52,6 +52,8 @@ (define-module (gnu build file-systems)
read-partition-uuid
read-luks-partition-uuid
cleanly-unmounted-ext2?
bind-mount
system*/tty
@ -193,6 +195,23 @@ (define (read-ext2-superblock device)
if DEVICE does not contain an ext2 file system."
(read-superblock device 1024 264 ext2-superblock?))
(define (ext2-superblock-cleanly-unmounted? sblock)
"Return true if SBLOCK denotes a file system that was cleanly unmounted,
false otherwise."
(define EXT2_VALID_FS 1) ;cleanly unmounted
(define EXT2_ERROR_FS 2) ;errors detected
(define EXT3_FEATURE_INCOMPAT_RECOVER #x0004) ;journal needs recovery
(let ((state (bytevector-u16-ref sblock 58 %ext2-endianness)))
(cond ((= state EXT2_VALID_FS)
(let ((incompatible-features
(bytevector-u32-ref sblock 96 %ext2-endianness)))
(zero? (logand incompatible-features
EXT3_FEATURE_INCOMPAT_RECOVER))))
((= state EXT2_ERROR_FS) #f)
(else (error "invalid ext2 superblock state" state)))))
(define (ext2-superblock-uuid sblock)
"Return the UUID of ext2 superblock SBLOCK as a 16-byte bytevector."
(sub-bytevector sblock 104 16))
@ -220,6 +239,11 @@ (define (check-ext2-file-system device force? repair)
(2 'reboot-required)
(_ 'fatal-error)))
(define (cleanly-unmounted-ext2? device) ;convenience procedure
"Return true if DEVICE is an ext2 file system and if it was cleanly
unmounted."
(ext2-superblock-cleanly-unmounted? (read-ext2-superblock device)))
;;;
;;; Linux swap.