The patch titled
Subject: ipc: refactor msg list search into separate function
has been added to the -mm tree. Its filename is
ipc-refactor-msg-list-search-into-separate-function.patch
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------------------------------------------------------
From: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
Subject: ipc: refactor msg list search into separate function
Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
Acked-by: Stanislav Kinsbursky <skinsbursky@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
ipc/msg.c | 45 +++++++++++++++++++++++++--------------------
1 file changed, 25 insertions(+), 20 deletions(-)
diff -puN ipc/msg.c~ipc-refactor-msg-list-search-into-separate-function ipc/msg.c
--- a/ipc/msg.c~ipc-refactor-msg-list-search-into-separate-function
+++ a/ipc/msg.c
@@ -807,6 +807,30 @@ static inline void free_copy(struct msg_
}
#endif
+struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
+{
+ struct msg_msg *msg;
+ long count = 0;
+
+ list_for_each_entry(msg, &msq->q_messages, m_list) {
+ if (testmsg(msg, *msgtyp, mode) &&
+ !security_msg_queue_msgrcv(msq, msg, current,
+ *msgtyp, mode)) {
+ if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) {
+ *msgtyp = msg->m_type - 1;
+ } else if (mode == SEARCH_NUMBER) {
+ if (*msgtyp == count)
+ return msg;
+ } else
+ return msg;
+ count++;
+ }
+ }
+
+ return ERR_PTR(-EAGAIN);
+}
+
+
long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
int msgflg,
long (*msg_handler)(void __user *, struct msg_msg *, size_t))
@@ -837,32 +861,13 @@ long do_msgrcv(int msqid, void __user *b
for (;;) {
struct msg_receiver msr_d;
- struct msg_msg *walk_msg;
- long msg_counter = 0;
msg = ERR_PTR(-EACCES);
if (ipcperms(ns, &msq->q_perm, S_IRUGO))
goto out_unlock;
- msg = ERR_PTR(-EAGAIN);
- list_for_each_entry(walk_msg, &msq->q_messages, m_list) {
+ msg = find_msg(msq, &msgtyp, mode);
- if (testmsg(walk_msg, msgtyp, mode) &&
- !security_msg_queue_msgrcv(msq, walk_msg, current,
- msgtyp, mode)) {
-
- msg = walk_msg;
- if (mode == SEARCH_LESSEQUAL &&
- walk_msg->m_type != 1) {
- msgtyp = walk_msg->m_type - 1;
- } else if (mode == SEARCH_NUMBER) {
- if (msgtyp == msg_counter)
- break;
- } else
- break;
- msg_counter++;
- }
- }
if (!IS_ERR(msg)) {
/*
* Found a suitable message.
_
Patches currently in -mm which might be from peter@xxxxxxxxxxxxxxxxxx are
origin.patch
ipc-fix-potential-oops-when-src-msg-4k-w-msg_copy.patch
ipc-dont-allocate-a-copy-larger-than-max.patch
ipc-clamp-with-min.patch
ipc-separate-msg-allocation-from-userspace-copy.patch
ipc-tighten-msg-copy-loops.patch
ipc-set-efault-as-default-error-in-load_msg.patch
ipc-remove-msg-handling-from-queue-scan.patch
ipc-implement-msg_copy-as-a-new-receive-mode.patch
ipc-simplify-msg-list-search.patch
ipc-refactor-msg-list-search-into-separate-function.patch
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