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author | Serge E. Hallyn <serue@us.ibm.com> | 2009-04-06 19:01:11 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-07 08:31:09 -0700 |
commit | bdc8e5f85f9abe2e7c78dcf39d81f9a97178788b (patch) | |
tree | a25a9d10f3686c4cb309d2477376ee585322ef43 /ipc/mq_sysctl.c | |
parent | 7eafd7c74c3f2e67c27621b987b28397110d643f (diff) | |
download | kernel_goldelico_gta04-bdc8e5f85f9abe2e7c78dcf39d81f9a97178788b.zip kernel_goldelico_gta04-bdc8e5f85f9abe2e7c78dcf39d81f9a97178788b.tar.gz kernel_goldelico_gta04-bdc8e5f85f9abe2e7c78dcf39d81f9a97178788b.tar.bz2 |
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>
Diffstat (limited to 'ipc/mq_sysctl.c')
-rw-r--r-- | ipc/mq_sysctl.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/ipc/mq_sysctl.c b/ipc/mq_sysctl.c new file mode 100644 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); +} |