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vfs: syscall: Add move_mount(2) to move mounts around

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Add a move_mount() system call that will move a mount from one place to
another and, in the next commit, allow to attach an unattached mount tree.

The new system call looks like the following:

	int move_mount(int from_dfd, const char *from_path,
		       int to_dfd, const char *to_path,
		       unsigned int flags);

Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-api@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells
2018-11-05 17:40:30 +00:00
committed by Al Viro
parent a07b200047
commit 2db154b3ea
8 changed files with 131 additions and 33 deletions
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3
arch/x86/entry/syscalls/syscall_32.tbl
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@@ -399,7 +399,8 @@
385 i386 io_pgetevents sys_io_pgetevents_time32 __ia32_compat_sys_io_pgetevents
386 i386 rseq sys_rseq __ia32_sys_rseq
387 i386 open_tree sys_open_tree __ia32_sys_open_tree
# don't use numbers 388 through 392, add new calls at the end
388 i386 move_mount sys_move_mount __ia32_sys_move_mount
# don't use numbers 389 through 392, add new calls at the end
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