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linux: Add mount_setattr

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It was added on Linux 5.12 (2a1867219c7b27f928e2545782b86daaf9ad50bd)
to allow change the properties of a mount or a mount tree using file
descriptors which the new mount api is based on.

Checked on x86_64-linux-gnu.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella 2022-06-24 16:59:19 -03:00
parent c3b02b6567
commit af1aa36c61
39 changed files with 91 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
NEWS
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@ -41,10 +41,10 @@ Major new features:
have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
validation by applications.
* On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, and open_tree
functions have been added. They are part of the new Linux kernel mount
APIs that allow applications to more flexibly configure and operate on
filesystem mounts. The new mount APIs are specifically designed to work
* On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
and mount_setattr have been added. They are part of the new Linux kernel
mount APIs that allow applications to more flexibly configure and operate
on filesystem mounts. The new mount APIs are specifically designed to work
with namespaces.
* localedef now accepts locale definition files encoded in UTF-8.

1
sysdeps/unix/sysv/linux/Versions
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@ -305,6 +305,7 @@ libc {
fsopen;
fspick;
move_mount;
mount_setattr;
open_tree;
pidfd_open;
pidfd_getfd;

1
sysdeps/unix/sysv/linux/aarch64/libc.abilist
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@ -2620,6 +2620,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/alpha/libc.abilist
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@ -2717,6 +2717,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/arc/libc.abilist
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@ -2381,6 +2381,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/arm/be/libc.abilist
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@ -500,6 +500,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/arm/le/libc.abilist
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@ -497,6 +497,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/csky/libc.abilist
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@ -2656,6 +2656,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/hppa/libc.abilist
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@ -2605,6 +2605,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/i386/libc.abilist
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@ -2789,6 +2789,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/ia64/libc.abilist
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@ -2555,6 +2555,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
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@ -501,6 +501,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
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@ -2732,6 +2732,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
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@ -2705,6 +2705,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
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@ -2702,6 +2702,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
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@ -2697,6 +2697,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
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@ -2695,6 +2695,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
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@ -2703,6 +2703,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
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@ -2606,6 +2606,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/nios2/libc.abilist
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@ -2744,6 +2744,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/or1k/libc.abilist
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@ -2127,6 +2127,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
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@ -2759,6 +2759,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
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@ -2792,6 +2792,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
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@ -2514,6 +2514,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
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@ -2816,6 +2816,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
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@ -2383,6 +2383,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
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@ -2583,6 +2583,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
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@ -2757,6 +2757,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
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@ -2551,6 +2551,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/sh/be/libc.abilist
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@ -2612,6 +2612,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/sh/le/libc.abilist
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@ -2609,6 +2609,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
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@ -2752,6 +2752,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
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@ -2578,6 +2578,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

22
sysdeps/unix/sysv/linux/sys/mount.h
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@ -23,6 +23,8 @@
#include <fcntl.h>
#include <features.h>
#include <stdint.h>
#include <stddef.h>
#include <sys/ioctl.h>
#define BLOCK_SIZE 1024
@ -155,6 +157,17 @@ enum
#define MOUNT_ATTR_NOSYMFOLLOW 0x00200000 /* Do not follow symlinks. */
/* For mount_setattr. */
struct mount_attr
{
uint64_t attr_set;
uint64_t attr_clr;
uint64_t propagation;
uint64_t userns_fd;
};
#define MOUNT_ATTR_SIZE_VER0 32 /* sizeof first published struct */
/* move_mount flags. */
#define MOVE_MOUNT_F_SYMLINKS 0x00000001 /* Follow symlinks on from path */
#define MOVE_MOUNT_F_AUTOMOUNTS 0x00000002 /* Follow automounts on from path */
@ -240,6 +253,15 @@ extern int fspick (int __dfd, const char *__path, unsigned int __flags)
extern int open_tree (int __dfd, const char *__filename, unsigned int __flags)
__THROW;
/* Change the mount properties of the mount or an entire mount tree. If
PATH is a relative pathname, then it is interpreted relative to the
directory referred to by the file descriptor dirfd. Otherwise if DFD is
the special value AT_FDCWD then PATH is interpreted relative to the current
working directory of the calling process. */
extern int mount_setattr (int __dfd, const char *__path, unsigned int __flags,
struct mount_attr *__uattr, size_t __usize)
__THROW;
__END_DECLS
#endif /* _SYS_MOUNT_H */

1
sysdeps/unix/sysv/linux/syscalls.list
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@ -39,6 +39,7 @@ mincore - mincore i:aUV mincore
mlock - mlock i:bU mlock
mlockall - mlockall i:i mlockall
mount EXTRA mount i:sssUp __mount mount
mount_setattr EXTRA mount_setattr i:isUpU mount_setattr
move_mount EXTRA move_mount i:isisU move_mount
munlock - munlock i:aU munlock
munlockall - munlockall i: munlockall

4
sysdeps/unix/sysv/linux/tst-mount-consts.py
View File

@ -56,7 +56,9 @@ def main():
check('FSMOUNT_.*'),
# MOVE_MOUNT__MASK may vary depending of the kernel version.
check('MOVE_MOUNT_.*', 'MOVE_MOUNT__MASK'),
check('OPEN_TREE_*'))
check('OPEN_TREE_*'),
# MOUNT_ATTR_SIZE_VER0 is used for mount_setattr.
check('MOUNT_ATTR_.*', 'MOUNT_ATTR_SIZE_VER0'))
sys.exit(status)
if __name__ == '__main__':

30
sysdeps/unix/sysv/linux/tst-mount.c
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@ -23,6 +23,9 @@
#include <sys/wait.h>
#include <sys/mount.h>
_Static_assert (sizeof (struct mount_attr) == MOUNT_ATTR_SIZE_VER0,
"sizeof (struct mount_attr) != MOUNT_ATTR_SIZE_VER0");
static void
subprocess (void)
{
@ -67,10 +70,31 @@ subprocess (void)
TEST_COMPARE (open_tree (AT_FDCWD, "", 0), -1);
TEST_COMPARE (errno, ENOENT);
int fd_tree = open_tree (AT_FDCWD, "/tmp",
OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC);
TEST_VERIFY (fd_tree != -1);
{
int fd_tree = open_tree (AT_FDCWD, "/tmp",
OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC);
TEST_VERIFY (fd_tree != -1);
struct mount_attr attr =
{
.attr_set = MOUNT_ATTR_RDONLY,
};
mount_setattr (fd_tree, "", AT_EMPTY_PATH, &attr,
sizeof (attr));
int r = mount_setattr (fd_tree, "", AT_EMPTY_PATH, &attr,
sizeof (attr));
/* New mount API was added on 5.1, but mount_setattr on 5.12. */
if (r == -1)
TEST_COMPARE (errno, ENOSYS);
else
{
TEST_COMPARE (mount_setattr (-1, "", AT_EMPTY_PATH, &attr,
sizeof (attr)), -1);
TEST_COMPARE (errno, EBADF);
TEST_COMPARE (mount_setattr (fd_tree, "", AT_EMPTY_PATH, &attr,
sizeof (attr) - 8), -1);
TEST_COMPARE (errno, EINVAL);
}
}
_exit (0);

1
sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
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@ -2529,6 +2529,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F

1
sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
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@ -2635,6 +2635,7 @@ GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 mount_setattr F
GLIBC_2.36 move_mount F
GLIBC_2.36 open_tree F
GLIBC_2.36 pidfd_getfd F