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Commit 3fcfe786 authored by Stanislav Kinsbursky's avatar Stanislav Kinsbursky Committed by Linus Torvalds
Browse files

ipc: add more comments to message copying related code 



Signed-off-by: default avatarStanislav Kinsbursky <skinsbursky@parallels.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 51eeacaa

ipc/msg.c

+8 −0
Original line number Diff line number Diff line
@@ -770,6 +770,10 @@ static long do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz) 
}



#ifdef CONFIG_CHECKPOINT_RESTORE

/*

 * This function creates new kernel message structure, large enough to store

 * bufsz message bytes.

 */

static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz,

					   int msgflg, long *msgtyp,

					   unsigned long *copy_number)
@@ -881,6 +885,10 @@ long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, 
				msg = ERR_PTR(-E2BIG);

				goto out_unlock;

			}

			/*

			 * If we are copying, then do not unlink message and do

			 * not update queue parameters.

			 */

			if (msgflg & MSG_COPY)

				goto out_unlock;

			list_del(&msg->m_list);