[LU-5058] support for linux process namespace is broken

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.6.0
• Labels: patch
• Severity: 3
• Assignee: Bob Glossman (Inactive)
• Reporter: Bob Glossman (Inactive)

Description

Some recent landing in lustre master has broken the support for linux process namespace done in LU-4476. When building even client builds for rhel7 with CONFIG_UIDGID_STRICT_TYPE_CHECKS enabled (the default setting) there are many build errors. It looks like some new uid/gid calls were added without regard to the changes from LU-4476 that needed to be conformed to. I suspect the recent commit LU-1778 llite: fix inconsistencies of root squash feature is at fault.

example errors:

  CC [M]  /home/bogl/lustre-release/lustre/llite/file.o
In file included from include/uapi/linux/stddef.h:1:0,
                 from include/linux/stddef.h:4,
                 from /usr/src/kernels/3.10.0-123.el7.x86_64/include/uapi/linux/posix_types.h:4,
                 from include/uapi/linux/types.h:13,
                 from include/linux/types.h:5,
                 from include/linux/proc_fs.h:7,
                 from /home/bogl/lustre-release/lustre/include/linux/lustre_dlm.h:43,
                 from /home/bogl/lustre-release/lustre/include/lustre_dlm.h:52,
                 from /home/bogl/lustre-release/lustre/llite/file.c:44:
/home/bogl/lustre-release/lustre/llite/file.c: In function ‘ll_inode_permission’:
/home/bogl/lustre-release/lustre/llite/file.c:3545:24: error: invalid operands to binary == (have ‘kuid_t’ and ‘int’)
        current_fsuid() == 0 &&
                        ^
include/linux/compiler.h:153:42: note: in definition of macro ‘unlikely’
 # define unlikely(x) __builtin_expect(!!(x), 0)
                                          ^
In file included from /home/bogl/lustre-release/libcfs/include/libcfs/libcfs.h:272:0,
                 from /home/bogl/lustre-release/lustre/include/lustre_lib.h:49,
                 from /home/bogl/lustre-release/lustre/include/lustre_dlm.h:61,
                 from /home/bogl/lustre-release/lustre/llite/file.c:44:
/home/bogl/lustre-release/libcfs/include/libcfs/libcfs_debug.h:225:23: error: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘kuid_t’ [-Werror=format=]
         static struct libcfs_debug_msg_data msgdata;                    \
                       ^
/home/bogl/lustre-release/libcfs/include/libcfs/libcfs_debug.h:235:35: note: in expansion of macro ‘__CDEBUG’
 #define CDEBUG(mask, format, ...) __CDEBUG(NULL, mask, format, ## __VA_ARGS__)
                                   ^
/home/bogl/lustre-release/lustre/llite/file.c:3550:3: note: in expansion of macro ‘CDEBUG’
   CDEBUG(D_OTHER, "squash creds (%d:%d)=>(%d:%d)\n",
   ^
/home/bogl/lustre-release/libcfs/include/libcfs/libcfs_debug.h:225:23: error: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘kgid_t’ [-Werror=format=]
         static struct libcfs_debug_msg_data msgdata;                    \
                       ^
/home/bogl/lustre-release/libcfs/include/libcfs/libcfs_debug.h:235:35: note: in expansion of macro ‘__CDEBUG’
 #define CDEBUG(mask, format, ...) __CDEBUG(NULL, mask, format, ## __VA_ARGS__)
                                   ^
/home/bogl/lustre-release/lustre/llite/file.c:3550:3: note: in expansion of macro ‘CDEBUG’
   CDEBUG(D_OTHER, "squash creds (%d:%d)=>(%d:%d)\n",
   ^
/home/bogl/lustre-release/lustre/llite/file.c:3560:15: error: incompatible types when assigning to type ‘kuid_t’ from type ‘uid_t’
   cred->fsuid = squash->rsi_uid;
               ^
/home/bogl/lustre-release/lustre/llite/file.c:3561:15: error: incompatible types when assigning to type ‘kgid_t’ from type ‘gid_t’
   cred->fsgid = squash->rsi_gid;
               ^
cc1: all warnings being treated as errors
make[6]: *** [/home/bogl/lustre-release/lustre/llite/file.o] Error 1
make[5]: *** [/home/bogl/lustre-release/lustre/llite] Error 2
make[4]: *** [/home/bogl/lustre-release/lustre] Error 2
make[3]: *** [_module_/home/bogl/lustre-release] Error 2
make[3]: Leaving directory `/usr/src/kernels/3.10.0-123.el7.x86_64'
make[2]: *** [modules] Error 2
make[2]: Leaving directory `/home/bogl/lustre-release'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/bogl/lustre-release'
make: *** [all] Error 2

Issue Links

• is related to: LU-4416 support for 3.12 linux kernel
• is related to: LU-4476 Add support for linux process namespace

Comments

[Peter Jones]

Landed for 2.6

[Bob Glossman (Inactive)]

Pretty sure this fix is needed for any kernel config'ed with CONFIG_UIDGID_STRICT_TYPE_CHECKS enabled. rhel7 is just the first one that has that turned on by default.

[Bob Glossman (Inactive)]

In addition to passing the standard builds I've verified that http://review.whamcloud.com/#/c/10325 does repair the client build in rhel7

[James A Simmons]

http://review.whamcloud.com/#/c/10325

[Bob Glossman (Inactive)]

James, you are just too fast for me. see Description. problem is seen by a simple client build in the latest rhel7 rc image.

./configure --disable-server
make

[James A Simmons]

Oh I see the problem.