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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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7
include/linux/security.h
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@@ -250,6 +250,7 @@ int security_sb_clone_mnt_opts(const struct super_block *oldsb,
unsigned long *set_kern_flags);
int security_add_mnt_opt(const char *option, const char *val,
int len, void **mnt_opts);
int security_move_mount(const struct path *from_path, const struct path *to_path);
int security_dentry_init_security(struct dentry *dentry, int mode,
const struct qstr *name, void **ctx,
u32 *ctxlen);
@@ -611,6 +612,12 @@ static inline int security_add_mnt_opt(const char *option, const char *val,
return 0;
}
static inline int security_move_mount(const struct path *from_path,
const struct path *to_path)
{
return 0;
}
static inline int security_inode_alloc(struct inode *inode)
{
return 0;