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| author | David Howells <dhowells@redhat.com> | 2018-11-01 23:36:23 +0000 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2019-03-20 18:49:06 -0400 |
| commit | cf3cba4a429be43e5527a3f78859b1bfd9ebc5fb (patch) | |
| tree | 41f4c4a999e7e22644b0f3a220208519dc1f4ccd /arch/x86/entry | |
| parent | 93766fbd2696c2c4453dd8e1070977e9cd4e6b6d (diff) | |
| download | linux-cf3cba4a429be43e5527a3f78859b1bfd9ebc5fb.tar.gz | |
vfs: syscall: Add fspick() to select a superblock for reconfiguration
Provide an fspick() system call that can be used to pick an existing mountpoint into an fs_context which can thereafter be used to reconfigure a superblock (equivalent of the superblock side of -o remount). This looks like: int fd = fspick(AT_FDCWD, "/mnt", FSPICK_CLOEXEC | FSPICK_NO_AUTOMOUNT); fsconfig(fd, FSCONFIG_SET_FLAG, "intr", NULL, 0); fsconfig(fd, FSCONFIG_SET_FLAG, "noac", NULL, 0); fsconfig(fd, FSCONFIG_CMD_RECONFIGURE, NULL, NULL, 0); At the point of fspick being called, the file descriptor referring to the filesystem context is in exactly the same state as the one that was created by fsopen() after fsmount() has been successfully called. Signed-off-by: David Howells <dhowells@redhat.com> cc: linux-api@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/x86/entry')
| -rw-r--r-- | arch/x86/entry/syscalls/syscall_32.tbl | 2 | ||||
| -rw-r--r-- | arch/x86/entry/syscalls/syscall_64.tbl | 1 |
2 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index 5b5c9189c507..4cd5f982b1e5 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -403,7 +403,7 @@ 389 i386 fsopen sys_fsopen __ia32_sys_fsopen 390 i386 fsconfig sys_fsconfig __ia32_sys_fsconfig 391 i386 fsmount sys_fsmount __ia32_sys_fsmount -# don't use number 392, add new calls at the end +392 i386 fspick sys_fspick __ia32_sys_fspick 393 i386 semget sys_semget __ia32_sys_semget 394 i386 semctl sys_semctl __ia32_compat_sys_semctl 395 i386 shmget sys_shmget __ia32_sys_shmget diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index 984ad594bb2b..64ca0d06259a 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -348,6 +348,7 @@ 337 common fsopen __x64_sys_fsopen 338 common fsconfig __x64_sys_fsconfig 339 common fsmount __x64_sys_fsmount +340 common fspick __x64_sys_fspick # don't use numbers 387 through 423, add new calls after the last # 'common' entry 424 common pidfd_send_signal __x64_sys_pidfd_send_signal |