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zfs/config/kernel-super-userns.m4

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Linux 4.8 compat: new s_user_ns member of struct super_block 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
2016-08-04 01:19:04 +08:00
dnl #
dnl # 4.8 API change
dnl # struct user_namespace was added to struct super_block as
dnl # super->s_user_ns member
dnl #
Perform KABI checks in parallel Reduce the time required for ./configure to perform the needed KABI checks by allowing kbuild to compile multiple test cases in parallel. This was accomplished by splitting each test's source code from the logic handling whether that code could be compiled or not. By introducing this split it's possible to minimize the number of times kbuild needs to be invoked. As importantly, it means all of the tests can be built in parallel. This does require a little extra care since we expect some tests to fail, so the --keep-going (-k) option must be provided otherwise some tests may not get compiled. Furthermore, since a failure during the kbuild modpost phase will result in an early exit; the final linking phase is limited to tests which passed the initial compilation and produced an object file. Once everything has been built the configure script proceeds as previously. The only significant difference is that it now merely needs to test for the existence of a .ko file to determine the result of a given test. This vastly speeds up the entire process. New test cases should use ZFS_LINUX_TEST_SRC to declare their test source code and ZFS_LINUX_TEST_RESULT to check the result. All of the existing kernel-*.m4 files have been updated accordingly, see config/kernel-current-time.m4 for a basic example. The legacy ZFS_LINUX_TRY_COMPILE macro has been kept to handle special cases but it's use is not encouraged. master (secs) patched (secs) ------------- ---------------- autogen.sh 61 68 configure 137 24 (~17% of current run time) make -j $(nproc) 44 44 make rpms 287 150 Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #8547 Closes #9132 Closes #9341
2019-10-02 03:50:34 +08:00
AC_DEFUN([ZFS_AC_KERNEL_SRC_SUPER_USER_NS], [
ZFS_LINUX_TEST_SRC([super_user_ns], [
Linux 4.8 compat: new s_user_ns member of struct super_block 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
2016-08-04 01:19:04 +08:00
#include <linux/fs.h>
#include <linux/user_namespace.h>
Perform KABI checks in parallel Reduce the time required for ./configure to perform the needed KABI checks by allowing kbuild to compile multiple test cases in parallel. This was accomplished by splitting each test's source code from the logic handling whether that code could be compiled or not. By introducing this split it's possible to minimize the number of times kbuild needs to be invoked. As importantly, it means all of the tests can be built in parallel. This does require a little extra care since we expect some tests to fail, so the --keep-going (-k) option must be provided otherwise some tests may not get compiled. Furthermore, since a failure during the kbuild modpost phase will result in an early exit; the final linking phase is limited to tests which passed the initial compilation and produced an object file. Once everything has been built the configure script proceeds as previously. The only significant difference is that it now merely needs to test for the existence of a .ko file to determine the result of a given test. This vastly speeds up the entire process. New test cases should use ZFS_LINUX_TEST_SRC to declare their test source code and ZFS_LINUX_TEST_RESULT to check the result. All of the existing kernel-*.m4 files have been updated accordingly, see config/kernel-current-time.m4 for a basic example. The legacy ZFS_LINUX_TRY_COMPILE macro has been kept to handle special cases but it's use is not encouraged. master (secs) patched (secs) ------------- ---------------- autogen.sh 61 68 configure 137 24 (~17% of current run time) make -j $(nproc) 44 44 make rpms 287 150 Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #8547 Closes #9132 Closes #9341
2019-10-02 03:50:34 +08:00
], [
Linux 4.8 compat: new s_user_ns member of struct super_block 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
2016-08-04 01:19:04 +08:00
struct super_block super;
super.s_user_ns = (struct user_namespace *)NULL;
Perform KABI checks in parallel Reduce the time required for ./configure to perform the needed KABI checks by allowing kbuild to compile multiple test cases in parallel. This was accomplished by splitting each test's source code from the logic handling whether that code could be compiled or not. By introducing this split it's possible to minimize the number of times kbuild needs to be invoked. As importantly, it means all of the tests can be built in parallel. This does require a little extra care since we expect some tests to fail, so the --keep-going (-k) option must be provided otherwise some tests may not get compiled. Furthermore, since a failure during the kbuild modpost phase will result in an early exit; the final linking phase is limited to tests which passed the initial compilation and produced an object file. Once everything has been built the configure script proceeds as previously. The only significant difference is that it now merely needs to test for the existence of a .ko file to determine the result of a given test. This vastly speeds up the entire process. New test cases should use ZFS_LINUX_TEST_SRC to declare their test source code and ZFS_LINUX_TEST_RESULT to check the result. All of the existing kernel-*.m4 files have been updated accordingly, see config/kernel-current-time.m4 for a basic example. The legacy ZFS_LINUX_TRY_COMPILE macro has been kept to handle special cases but it's use is not encouraged. master (secs) patched (secs) ------------- ---------------- autogen.sh 61 68 configure 137 24 (~17% of current run time) make -j $(nproc) 44 44 make rpms 287 150 Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #8547 Closes #9132 Closes #9341
2019-10-02 03:50:34 +08:00
])
])
AC_DEFUN([ZFS_AC_KERNEL_SUPER_USER_NS], [
AC_MSG_CHECKING([whether super_block->s_user_ns exists])
ZFS_LINUX_TEST_RESULT([super_user_ns], [
Linux 4.8 compat: new s_user_ns member of struct super_block 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
2016-08-04 01:19:04 +08:00
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SUPER_USER_NS, 1,
[super_block->s_user_ns exists])
],[
AC_MSG_RESULT(no)
])
])