namespaces: mqueue namespace: adapt sysctl

Largely inspired from ipc/ipc_sysctl.c.  This patch isolates the mqueue
sysctl stuff in its own file.

[akpm@linux-foundation.org: build fix]
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net>
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
index 3392d50..3bf40e2 100644 (file)
--- a/include/linux/ipc_namespace.h
+++ b/include/linux/ipc_namespace.h
@@ -128,4 +128,18 @@ static inline void put_ipc_ns(struct ipc_namespace *ns)
 {
 }
 #endif
+
+#ifdef CONFIG_POSIX_MQUEUE_SYSCTL
+
+struct ctl_table_header;
+extern struct ctl_table_header *mq_register_sysctl_table(void);
+
+#else /* CONFIG_POSIX_MQUEUE_SYSCTL */
+
+static inline struct ctl_table_header *mq_register_sysctl_table(void)
+{
+       return NULL;
+}
+
+#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
 #endif

diff --git a/init/Kconfig b/init/Kconfig
index a0807ba..f2f9b53 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -208,6 +208,12 @@ config POSIX_MQUEUE
 
          If unsure, say Y.
 
+config POSIX_MQUEUE_SYSCTL
+       bool
+       depends on POSIX_MQUEUE
+       depends on SYSCTL
+       default y
+
 config BSD_PROCESS_ACCT
        bool "BSD Process Accounting"
        help

diff --git a/ipc/Makefile b/ipc/Makefile
index 65c3843..4e1955e 100644 (file)
--- a/ipc/Makefile
+++ b/ipc/Makefile
@@ -8,4 +8,5 @@ obj-$(CONFIG_SYSVIPC_SYSCTL) += ipc_sysctl.o
 obj_mq-$(CONFIG_COMPAT) += compat_mq.o
 obj-$(CONFIG_POSIX_MQUEUE) += mqueue.o msgutil.o $(obj_mq-y)
 obj-$(CONFIG_IPC_NS) += namespace.o
+obj-$(CONFIG_POSIX_MQUEUE_SYSCTL) += mq_sysctl.o
 

diff --git a/ipc/mq_sysctl.c b/ipc/mq_sysctl.c
new file mode 100644 (file)
index 0000000..89f60ec
--- /dev/null
+++ b/ipc/mq_sysctl.c
@@ -0,0 +1,116 @@
+/*
+ *  Copyright (C) 2007 IBM Corporation
+ *
+ *  Author: Cedric Le Goater <clg@fr.ibm.com>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License as
+ *  published by the Free Software Foundation, version 2 of the
+ *  License.
+ */
+
+#include <linux/nsproxy.h>
+#include <linux/ipc_namespace.h>
+#include <linux/sysctl.h>
+
+/*
+ * Define the ranges various user-specified maximum values can
+ * be set to.
+ */
+#define MIN_MSGMAX     1               /* min value for msg_max */
+#define MAX_MSGMAX     HARD_MSGMAX     /* max value for msg_max */
+#define MIN_MSGSIZEMAX 128             /* min value for msgsize_max */
+#define MAX_MSGSIZEMAX (8192*128)      /* max value for msgsize_max */
+
+static void *get_mq(ctl_table *table)
+{
+       char *which = table->data;
+       struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
+       which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
+       return which;
+}
+
+#ifdef CONFIG_PROC_SYSCTL
+static int proc_mq_dointvec(ctl_table *table, int write, struct file *filp,
+       void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       struct ctl_table mq_table;
+       memcpy(&mq_table, table, sizeof(mq_table));
+       mq_table.data = get_mq(table);
+
+       return proc_dointvec(&mq_table, write, filp, buffer, lenp, ppos);
+}
+
+static int proc_mq_dointvec_minmax(ctl_table *table, int write,
+       struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       struct ctl_table mq_table;
+       memcpy(&mq_table, table, sizeof(mq_table));
+       mq_table.data = get_mq(table);
+
+       return proc_dointvec_minmax(&mq_table, write, filp, buffer,
+                                       lenp, ppos);
+}
+#else
+#define proc_mq_dointvec NULL
+#define proc_mq_dointvec_minmax NULL
+#endif
+
+static int msg_max_limit_min = MIN_MSGMAX;
+static int msg_max_limit_max = MAX_MSGMAX;
+
+static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
+static int msg_maxsize_limit_max = MAX_MSGSIZEMAX;
+
+static ctl_table mq_sysctls[] = {
+       {
+               .procname       = "queues_max",
+               .data           = &init_ipc_ns.mq_queues_max,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_mq_dointvec,
+       },
+       {
+               .procname       = "msg_max",
+               .data           = &init_ipc_ns.mq_msg_max,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_mq_dointvec_minmax,
+               .extra1         = &msg_max_limit_min,
+               .extra2         = &msg_max_limit_max,
+       },
+       {
+               .procname       = "msgsize_max",
+               .data           = &init_ipc_ns.mq_msgsize_max,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_mq_dointvec_minmax,
+               .extra1         = &msg_maxsize_limit_min,
+               .extra2         = &msg_maxsize_limit_max,
+       },
+       { .ctl_name = 0 }
+};
+
+static ctl_table mq_sysctl_dir[] = {
+       {
+               .procname       = "mqueue",
+               .mode           = 0555,
+               .child          = mq_sysctls,
+       },
+       { .ctl_name = 0 }
+};
+
+static ctl_table mq_sysctl_root[] = {
+       {
+               .ctl_name       = CTL_FS,
+               .procname       = "fs",
+               .mode           = 0555,
+               .child          = mq_sysctl_dir,
+       },
+       { .ctl_name = 0 }
+};
+
+struct ctl_table_header *mq_register_sysctl_table(void)
+{
+       return register_sysctl_table(mq_sysctl_root);
+}

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index c82d7b5..e35ba2c 100644 (file)
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -47,15 +47,6 @@
 #define STATE_PENDING  1
 #define STATE_READY    2
 
-/*
- * Define the ranges various user-specified maximum values can
- * be set to.
- */
-#define MIN_MSGMAX     1               /* min value for msg_max */
-#define MAX_MSGMAX     HARD_MSGMAX     /* max value for msg_max */
-#define MIN_MSGSIZEMAX 128             /* min value for msgsize_max */
-#define MAX_MSGSIZEMAX (8192*128)      /* max value for msgsize_max */
-
 struct ext_wait_queue {                /* queue of sleeping tasks */
        struct task_struct *task;
        struct list_head list;
@@ -1271,60 +1262,6 @@ void mq_put_mnt(struct ipc_namespace *ns)
        mntput(ns->mq_mnt);
 }
 
-static int msg_max_limit_min = MIN_MSGMAX;
-static int msg_max_limit_max = MAX_MSGMAX;
-
-static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
-static int msg_maxsize_limit_max = MAX_MSGSIZEMAX;
-
-static ctl_table mq_sysctls[] = {
-       {
-               .procname       = "queues_max",
-               .data           = &init_ipc_ns.mq_queues_max,
-               .maxlen         = sizeof(int),
-               .mode           = 0644,
-               .proc_handler   = &proc_dointvec,
-       },
-       {
-               .procname       = "msg_max",
-               .data           = &init_ipc_ns.mq_msg_max,
-               .maxlen         = sizeof(int),
-               .mode           = 0644,
-               .proc_handler   = &proc_dointvec_minmax,
-               .extra1         = &msg_max_limit_min,
-               .extra2         = &msg_max_limit_max,
-       },
-       {
-               .procname       = "msgsize_max",
-               .data           = &init_ipc_ns.mq_msgsize_max,
-               .maxlen         = sizeof(int),
-               .mode           = 0644,
-               .proc_handler   = &proc_dointvec_minmax,
-               .extra1         = &msg_maxsize_limit_min,
-               .extra2         = &msg_maxsize_limit_max,
-       },
-       { .ctl_name = 0 }
-};
-
-static ctl_table mq_sysctl_dir[] = {
-       {
-               .procname       = "mqueue",
-               .mode           = 0555,
-               .child          = mq_sysctls,
-       },
-       { .ctl_name = 0 }
-};
-
-static ctl_table mq_sysctl_root[] = {
-       {
-               .ctl_name       = CTL_FS,
-               .procname       = "fs",
-               .mode           = 0555,
-               .child          = mq_sysctl_dir,
-       },
-       { .ctl_name = 0 }
-};
-
 static int __init init_mqueue_fs(void)
 {
        int error;
@@ -1336,7 +1273,7 @@ static int __init init_mqueue_fs(void)
                return -ENOMEM;
 
        /* ignore failues - they are not fatal */
-       mq_sysctl_table = register_sysctl_table(mq_sysctl_root);
+       mq_sysctl_table = mq_register_sysctl_table();
 
        error = register_filesystem(&mqueue_fs_type);
        if (error)