Messages in this thread Patch in this message | | | Subject | [PATCH 4/4] ipc: add more comments to message copying related code | From | Stanislav Kinsbursky <> | Date | Wed, 07 Nov 2012 13:05:10 +0300 |
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Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> --- ipc/msg.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/ipc/msg.c b/ipc/msg.c index 5e317fe..4a4725c 100644 --- a/ipc/msg.c +++ b/ipc/msg.c @@ -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);
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