From 444d0f621b64716f7868dcbde448e0c66ece4e61 Mon Sep 17 00:00:00 2001 From: Davidlohr Bueso Date: Tue, 30 Apr 2013 19:15:24 -0700 Subject: ipc: introduce lockless pre_down ipcctl Various forms of ipc use ipcctl_pre_down() to retrieve an ipc object and check permissions, mostly for IPC_RMID and IPC_SET commands. Introduce ipcctl_pre_down_nolock(), a lockless version of this function. The locking version is retained, yet modified to call the nolock version without affecting its semantics, thus transparent to all ipc callers. Signed-off-by: Davidlohr Bueso Signed-off-by: Rik van Riel Suggested-by: Linus Torvalds Cc: Chegu Vinod Cc: Emmanuel Benisty Cc: Jason Low Cc: Michel Lespinasse Cc: Peter Hurley Cc: Stanislav Kinsbursky Tested-by: Sedat Dilek Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- ipc/util.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'ipc/util.h') diff --git a/ipc/util.h b/ipc/util.h index bfc8d4ea6e46..13d92fea15a3 100644 --- a/ipc/util.h +++ b/ipc/util.h @@ -128,6 +128,9 @@ struct kern_ipc_perm *ipc_obtain_object(struct ipc_ids *ids, int id); void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out); void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out); int ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out); +struct kern_ipc_perm *ipcctl_pre_down_nolock(struct ipc_namespace *ns, + struct ipc_ids *ids, int id, int cmd, + struct ipc64_perm *perm, int extra_perm); struct kern_ipc_perm *ipcctl_pre_down(struct ipc_namespace *ns, struct ipc_ids *ids, int id, int cmd, struct ipc64_perm *perm, int extra_perm); -- cgit v1.2.3-70-g09d2