rewrite Linux nodatacow use in pure Perl w/o system

btrfs is Linux-only at the moment (and likely to remain that way
for practical purposes).  So rely on Linux ABI stability and use
the `syscall' and `ioctl' perlops rather than relying on Inline::C.
Inline::C (and gcc||clang) are monstrous dependencies which we
can't expect users to have.

This makes supporting new architectures more difficult, but new
architectures come along rarely and this reduces the burden for
the majority of Linux users on popular architectures (while
still avoiding the distribution of pre-built binaries).

Link: https://public-inbox.org/meta/YbCPWGaJEkV6eWfo@codewreck.org/

1 files changed, 9 insertions, 1 deletions

diff --git a/devel/syscall-list b/devel/syscall-list
index 3d55df1f..a6b1bfa7 100755
--- a/devel/syscall-list
+++ b/devel/syscall-list
@@ -26,8 +26,10 @@ system($cc, '-o', $x, $f, @cflags) == 0 or die "cc failed \$?=$?";
 exec($x);
 __DATA__
 #define _GNU_SOURCE
-#include <unistd.h>
 #include <sys/syscall.h>
+#include <sys/ioctl.h>
+#include <linux/fs.h>
+#include <unistd.h>
 #include <stdio.h>
 
 #define D(x) printf("$" #x " = %ld;\n", (long)x)
@@ -46,6 +48,12 @@ int main(void)
         D(SYS_inotify_add_watch);
         D(SYS_inotify_rm_watch);
         D(SYS_prctl);
+        D(SYS_fstatfs);
+#ifdef FS_IOC_GETFLAGS
+        printf("FS_IOC_GETFLAGS=%#lx\nFS_IOC_SETFLAGS=%#lx\n",
+                (unsigned long)FS_IOC_GETFLAGS, (unsigned long)FS_IOC_SETFLAGS);
+#endif
+
 #ifdef SYS_renameat2
         D(SYS_renameat2);
 #endif