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Support idmapped mount

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Adds support for idmapped mounts.  Supported as of Linux 5.12 this 
functionality allows user and group IDs to be remapped without changing 
their state on disk.  This can be useful for portable home directories
and a variety of container related use cases.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Youzhong Yang <yyang@mathworks.com>
Closes #12923
Closes #13671
This commit is contained in:
youzhongyang
2022-10-19 14:17:09 -04:00
committed by GitHub
parent eaaed26ffb
commit 2a068a1394
41 changed files with 1636 additions and 166 deletions
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config/kernel-idmap_mnt_api.m4
+25
View File
@@ -0,0 +1,25 @@
dnl #
dnl # 5.12 API
dnl #
dnl # Check if APIs for idmapped mount are available
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_IDMAP_MNT_API], [
ZFS_LINUX_TEST_SRC([idmap_mnt_api], [
#include <linux/fs.h>
],[
int fs_flags = 0;
fs_flags |= FS_ALLOW_IDMAP;
])
])
AC_DEFUN([ZFS_AC_KERNEL_IDMAP_MNT_API], [
AC_MSG_CHECKING([whether APIs for idmapped mount are present])
ZFS_LINUX_TEST_RESULT([idmap_mnt_api], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_IDMAP_MNT_API, 1,
[APIs for idmapped mount are present])
],[
AC_MSG_RESULT([no])
])
])
config/kernel.m4
+2
View File
@@ -147,6 +147,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_ZERO_PAGE
ZFS_AC_KERNEL_SRC___COPY_FROM_USER_INATOMIC
ZFS_AC_KERNEL_SRC_USER_NS_COMMON_INUM
ZFS_AC_KERNEL_SRC_IDMAP_MNT_API
AC_MSG_CHECKING([for available kernel interfaces])
ZFS_LINUX_TEST_COMPILE_ALL([kabi])
@@ -267,6 +268,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_ZERO_PAGE
ZFS_AC_KERNEL___COPY_FROM_USER_INATOMIC
ZFS_AC_KERNEL_USER_NS_COMMON_INUM
ZFS_AC_KERNEL_IDMAP_MNT_API
])
dnl #