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linux: Add fspick

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It was added on Linux 5.2 (cf3cba4a429be43e5527a3f78859b1bfd9ebc5fb)
that can be used to pick an existing mountpoint into an filesystem
context which can thereafter be used to reconfigure a superblock
with fsconfig syscall.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella 2022-06-24 16:59:16 -03:00
parent 7eae6a91e9
commit 60f574e140
37 changed files with 52 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
NEWS
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@ -41,10 +41,11 @@ Major new features:
have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
validation by applications.
* On Linux, the fsopen, fsmount, move_mount, and fsconfig 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 with namespaces.
* On Linux, the fsopen, fsmount, move_mount, fsconfig, and fspick 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 with
namespaces.
* localedef now accepts locale definition files encoded in UTF-8.
Previously, input bytes not within the ASCII range resulted in

1
sysdeps/unix/sysv/linux/Versions
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@ -303,6 +303,7 @@ libc {
fsconfig;
fsmount;
fsopen;
fspick;
move_mount;
pidfd_open;
pidfd_getfd;

1
sysdeps/unix/sysv/linux/aarch64/libc.abilist
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@ -2619,6 +2619,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/alpha/libc.abilist
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@ -2716,6 +2716,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/arc/libc.abilist
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@ -2380,6 +2380,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/arm/be/libc.abilist
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@ -499,6 +499,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/arm/le/libc.abilist
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@ -496,6 +496,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/csky/libc.abilist
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@ -2655,6 +2655,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/hppa/libc.abilist
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@ -2604,6 +2604,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/i386/libc.abilist
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@ -2788,6 +2788,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/ia64/libc.abilist
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@ -2554,6 +2554,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
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@ -500,6 +500,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
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@ -2731,6 +2731,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
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@ -2704,6 +2704,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
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@ -2701,6 +2701,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
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@ -2696,6 +2696,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
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@ -2694,6 +2694,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
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@ -2702,6 +2702,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
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@ -2605,6 +2605,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/nios2/libc.abilist
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@ -2743,6 +2743,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/or1k/libc.abilist
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@ -2126,6 +2126,7 @@ GLIBC_2.35 wscanf F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
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@ -2758,6 +2758,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
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@ -2791,6 +2791,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
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@ -2513,6 +2513,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
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@ -2815,6 +2815,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
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@ -2382,6 +2382,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
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@ -2582,6 +2582,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
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@ -2756,6 +2756,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
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@ -2550,6 +2550,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/sh/be/libc.abilist
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@ -2611,6 +2611,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/sh/le/libc.abilist
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@ -2608,6 +2608,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
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@ -2751,6 +2751,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
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@ -2577,6 +2577,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

12
sysdeps/unix/sysv/linux/sys/mount.h
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@ -163,6 +163,14 @@ enum
#define MOVE_MOUNT_T_EMPTY_PATH 0x00000040 /* Empty to path permitted */
#define MOVE_MOUNT_SET_GROUP 0x00000100 /* Set sharing group instead */
/* fspick flags. */
#define FSPICK_CLOEXEC 0x00000001
#define FSPICK_SYMLINK_NOFOLLOW 0x00000002
#define FSPICK_NO_AUTOMOUNT 0x00000004
#define FSPICK_EMPTY_PATH 0x00000008
/* The type of fsconfig call made. */
enum fsconfig_command
{
@ -219,6 +227,10 @@ extern int move_mount (int __from_dfd, const char *__from_pathname,
extern int fsconfig (int __fd, unsigned int __cmd, const char *__key,
const void *__value, int __aux) __THROW;
/* Equivalent of fopen for an existing mount point. */
extern int fspick (int __dfd, const char *__path, unsigned int __flags)
__THROW;
__END_DECLS
#endif /* _SYS_MOUNT_H */

1
sysdeps/unix/sysv/linux/syscalls.list
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@ -15,6 +15,7 @@ flock - flock i:ii __flock flock
fsconfig EXTRA fsconfig i:iUsNi fsconfig
fsmount EXTRA fsmount i:iUU fsmount
fsopen EXTRA fsopen i:sU fsopen
fspick EXTRA fspick i:isU fspick
get_kernel_syms EXTRA get_kernel_syms i:p __compat_get_kernel_syms get_kernel_syms@GLIBC_2.0:GLIBC_2.23
getpid - getpid Ei: __getpid getpid
getegid - getegid Ei: __getegid getegid

1
sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
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@ -2528,6 +2528,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F

1
sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
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@ -2634,6 +2634,7 @@ GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 fsconfig F
GLIBC_2.36 fsmount F
GLIBC_2.36 fsopen F
GLIBC_2.36 fspick F
GLIBC_2.36 move_mount F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F