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Kernel 4.8 paved the way to enabling mounting a file system inside a non-init user namespace. To facilitate this a s_user_ns member was added holding the userns in which the filesystem's instance was mounted. This enables doing the uid/gid translation relative to this particular username space and not the default init_user_ns. Signed-off-by: Nikolay Borisov <n.borisov.lkml@gmail.com> Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4928
22 lines
527 B
Plaintext
22 lines
527 B
Plaintext
dnl #
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dnl # 4.8 API change
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dnl # struct user_namespace was added to struct super_block as
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dnl # super->s_user_ns member
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_SUPER_USER_NS], [
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AC_MSG_CHECKING([whether super_block->s_user_ns exists])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/fs.h>
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#include <linux/user_namespace.h>
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],[
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struct super_block super;
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super.s_user_ns = (struct user_namespace *)NULL;
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_SUPER_USER_NS, 1,
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[super_block->s_user_ns exists])
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],[
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AC_MSG_RESULT(no)
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])
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])
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