diff options
| author | David Howells <dhowells@redhat.com> | 2018-11-01 23:36:23 +0000 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2019-02-28 04:22:55 -0500 |
| commit | 889fcd98ab91abf62e71a48d282db852ab8687ba (patch) | |
| tree | 46067fd50a820a13365917eb416c512f0aff46ba /include | |
| parent | aa353d993694bfcda13534ac8c256768a86a7c54 (diff) | |
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 'include')
| -rw-r--r-- | include/linux/syscalls.h | 1 | ||||
| -rw-r--r-- | include/uapi/linux/mount.h | 8 |
2 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index a332a731a0e4..c3f9d865b91d 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -934,6 +934,7 @@ asmlinkage long sys_fsopen(const char __user *fs_name, unsigned int flags); asmlinkage long sys_fsconfig(int fs_fd, unsigned int cmd, const char __user *key, const void __user *value, int aux); asmlinkage long sys_fsmount(int fs_fd, unsigned int flags, unsigned int ms_flags); +asmlinkage long sys_fspick(int dfd, const char __user *path, unsigned int flags); /* * Architecture-specific system calls diff --git a/include/uapi/linux/mount.h b/include/uapi/linux/mount.h index 3888d3b91dc5..96a0240f23fe 100644 --- a/include/uapi/linux/mount.h +++ b/include/uapi/linux/mount.h @@ -78,6 +78,14 @@ #define FSOPEN_CLOEXEC 0x00000001 /* + * 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 { |