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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
commit 2db154b3ea
8 changed files with 130 additions and 32 deletions
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5
security/security.c
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@ -866,6 +866,11 @@ int security_add_mnt_opt(const char *option, const char *val, int len,
}
EXPORT_SYMBOL(security_add_mnt_opt);
int security_move_mount(const struct path *from_path, const struct path *to_path)
{
return call_int_hook(move_mount, 0, from_path, to_path);
}
int security_inode_alloc(struct inode *inode)
{
int rc = lsm_inode_alloc(inode);