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syscalls: Define the ST_* constants and add 'statfs-flags->mount-flags'.

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* guix/build/syscalls.scm (linux?): New variable.
(define-statfs-flags): New macro.
(ST_RDONLY, ST_NOSUID, ST_NODEV, ST_NOEXEC, ST_SYNCHRONOUS)
(ST_MANDLOCK, ST_WRITE, ST_APPEND, ST_IMMUTABLE, ST_NOATIME)
(ST_NODIRATIME, ST_RELATIME): New variables.
(statfs-flags->mount-flags): New procedure.
This commit is contained in:
Ludovic Courtès 2021-03-10 18:49:10 +01:00
parent b610e4b9a7
commit 9a6ea2f8dc
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GPG key ID: 090B11993D9AEBB5
1 changed files with 66 additions and 1 deletions
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67
guix/build/syscalls.scm
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@ -82,6 +82,21 @@ (define-module (guix build syscalls)
file-system-fragment-size
file-system-mount-flags
statfs
ST_RDONLY
ST_NOSUID
ST_NODEV
ST_NOEXEC
ST_SYNCHRONOUS
ST_MANDLOCK
ST_WRITE
ST_APPEND
ST_IMMUTABLE
ST_NOATIME
ST_NODIRATIME
ST_RELATIME
statfs-flags->mount-flags
free-disk-space
device-in-use?
add-to-entropy-count
@ -754,6 +769,56 @@ (define-record-type <file-system>
(define-syntax fsword ;fsword_t
(identifier-syntax long))
(define linux? (string-contains %host-type "linux-gnu"))
(define-syntax define-statfs-flags
(syntax-rules (linux hurd)
"Define the statfs mount flags."
((_ (name (linux linux-value) (hurd hurd-value)) rest ...)
(begin
(define name
(if linux? linux-value hurd-value))
(define-statfs-flags rest ...)))
((_ (name value) rest ...)
(begin
(define name value)
(define-statfs-flags rest ...)))
((_) #t)))
(define-statfs-flags ;<bits/statfs.h>
(ST_RDONLY 1)
(ST_NOSUID 2)
(ST_NODEV (linux 4) (hurd 0))
(ST_NOEXEC 8)
(ST_SYNCHRONOUS 16)
(ST_MANDLOCK (linux 64) (hurd 0))
(ST_WRITE (linux 128) (hurd 0))
(ST_APPEND (linux 256) (hurd 0))
(ST_IMMUTABLE (linux 512) (hurd 0))
(ST_NOATIME (linux 1024) (hurd 32))
(ST_NODIRATIME (linux 2048) (hurd 0))
(ST_RELATIME (linux 4096) (hurd 64)))
(define (statfs-flags->mount-flags flags)
"Convert FLAGS, a logical or of ST_* constants as returned by
'file-system-mount-flags', to the corresponding logical or of MS_* constants."
(letrec-syntax ((match-flags (syntax-rules (=>)
((_ (statfs => mount) rest ...)
(logior (if (zero? (logand flags statfs))
0
mount)
(match-flags rest ...)))
((_)
0))))
(match-flags
(ST_RDONLY => MS_RDONLY)
(ST_NOSUID => MS_NOSUID)
(ST_NODEV => MS_NODEV)
(ST_NOEXEC => MS_NOEXEC)
(ST_NOATIME => MS_NOATIME)
(ST_NODIRATIME => 0) ;FIXME
(ST_RELATIME => MS_RELATIME))))
(define-c-struct %statfs ;<bits/statfs.h>
sizeof-statfs ;slightly overestimated
file-system
@ -769,7 +834,7 @@ (define-c-struct %statfs ;<bits/statfs.h>
(identifier (array int 2))
(name-length fsword)
(fragment-size fsword)
(mount-flags fsword)
(mount-flags fsword) ;ST_*
(spare (array fsword 4)))
(define statfs