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-rw-r--r--drivers/thermal/samsung/exynos_thermal_common.c445
-rw-r--r--drivers/thermal/samsung/exynos_thermal_common.h106
2 files changed, 0 insertions, 551 deletions
diff --git a/drivers/thermal/samsung/exynos_thermal_common.c b/drivers/thermal/samsung/exynos_thermal_common.c
deleted file mode 100644
index 00aa68862a52..000000000000
--- a/drivers/thermal/samsung/exynos_thermal_common.c
+++ /dev/null
@@ -1,445 +0,0 @@
1/*
2 * exynos_thermal_common.c - Samsung EXYNOS common thermal file
3 *
4 * Copyright (C) 2013 Samsung Electronics
5 * Amit Daniel Kachhap <amit.daniel@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23#include <linux/cpu_cooling.h>
24#include <linux/err.h>
25#include <linux/slab.h>
26#include <linux/thermal.h>
27
28#include "exynos_thermal_common.h"
29
30struct exynos_thermal_zone {
31 enum thermal_device_mode mode;
32 struct thermal_zone_device *therm_dev;
33 struct thermal_cooling_device *cool_dev[MAX_COOLING_DEVICE];
34 unsigned int cool_dev_size;
35 struct platform_device *exynos4_dev;
36 struct thermal_sensor_conf *sensor_conf;
37 bool bind;
38};
39
40/* Get mode callback functions for thermal zone */
41static int exynos_get_mode(struct thermal_zone_device *thermal,
42 enum thermal_device_mode *mode)
43{
44 struct exynos_thermal_zone *th_zone = thermal->devdata;
45 if (th_zone)
46 *mode = th_zone->mode;
47 return 0;
48}
49
50/* Set mode callback functions for thermal zone */
51static int exynos_set_mode(struct thermal_zone_device *thermal,
52 enum thermal_device_mode mode)
53{
54 struct exynos_thermal_zone *th_zone = thermal->devdata;
55 if (!th_zone) {
56 dev_err(&thermal->device,
57 "thermal zone not registered\n");
58 return 0;
59 }
60
61 mutex_lock(&thermal->lock);
62
63 if (mode == THERMAL_DEVICE_ENABLED &&
64 !th_zone->sensor_conf->trip_data.trigger_falling)
65 thermal->polling_delay = IDLE_INTERVAL;
66 else
67 thermal->polling_delay = 0;
68
69 mutex_unlock(&thermal->lock);
70
71 th_zone->mode = mode;
72 thermal_zone_device_update(thermal);
73 dev_dbg(th_zone->sensor_conf->dev,
74 "thermal polling set for duration=%d msec\n",
75 thermal->polling_delay);
76 return 0;
77}
78
79
80/* Get trip type callback functions for thermal zone */
81static int exynos_get_trip_type(struct thermal_zone_device *thermal, int trip,
82 enum thermal_trip_type *type)
83{
84 struct exynos_thermal_zone *th_zone = thermal->devdata;
85 int max_trip = th_zone->sensor_conf->trip_data.trip_count;
86 int trip_type;
87
88 if (trip < 0 || trip >= max_trip)
89 return -EINVAL;
90
91 trip_type = th_zone->sensor_conf->trip_data.trip_type[trip];
92
93 if (trip_type == SW_TRIP)
94 *type = THERMAL_TRIP_CRITICAL;
95 else if (trip_type == THROTTLE_ACTIVE)
96 *type = THERMAL_TRIP_ACTIVE;
97 else if (trip_type == THROTTLE_PASSIVE)
98 *type = THERMAL_TRIP_PASSIVE;
99 else
100 return -EINVAL;
101
102 return 0;
103}
104
105/* Get trip temperature callback functions for thermal zone */
106static int exynos_get_trip_temp(struct thermal_zone_device *thermal, int trip,
107 unsigned long *temp)
108{
109 struct exynos_thermal_zone *th_zone = thermal->devdata;
110 int max_trip = th_zone->sensor_conf->trip_data.trip_count;
111
112 if (trip < 0 || trip >= max_trip)
113 return -EINVAL;
114
115 *temp = th_zone->sensor_conf->trip_data.trip_val[trip];
116 /* convert the temperature into millicelsius */
117 *temp = *temp * MCELSIUS;
118
119 return 0;
120}
121
122/* Get critical temperature callback functions for thermal zone */
123static int exynos_get_crit_temp(struct thermal_zone_device *thermal,
124 unsigned long *temp)
125{
126 struct exynos_thermal_zone *th_zone = thermal->devdata;
127 int max_trip = th_zone->sensor_conf->trip_data.trip_count;
128 /* Get the temp of highest trip*/
129 return exynos_get_trip_temp(thermal, max_trip - 1, temp);
130}
131
132/* Bind callback functions for thermal zone */
133static int exynos_bind(struct thermal_zone_device *thermal,
134 struct thermal_cooling_device *cdev)
135{
136 struct exynos_thermal_zone *th_zone = thermal->devdata;
137 struct thermal_sensor_conf *data = th_zone->sensor_conf;
138 struct device_node *child, *gchild, *np;
139 struct of_phandle_args cooling_spec;
140 unsigned long max, state = 0;
141 int ret = 0, i = 0;
142
143 /*
144 * Below code is necessary to skip binding when cpufreq's
145 * frequency table is not yet initialized.
146 */
147 cdev->ops->get_max_state(cdev, &state);
148 if (!state && !th_zone->cool_dev_size) {
149 th_zone->cool_dev_size = 1;
150 th_zone->cool_dev[0] = cdev;
151 th_zone->bind = false;
152 return 0;
153 }
154
155 np = of_find_node_by_path("/thermal-zones/cpu-thermal");
156 if (!np) {
157 pr_err("failed to find thmerla-zones/cpu-thermal node\n");
158 return -ENOENT;
159 }
160
161 child = of_get_child_by_name(np, "cooling-maps");
162
163 for_each_child_of_node(child, gchild) {
164 ret = of_parse_phandle_with_args(gchild, "cooling-device",
165 "#cooling-cells",
166 0, &cooling_spec);
167 if (ret < 0) {
168 pr_err("missing cooling_device property\n");
169 goto end;
170 }
171
172 if (cooling_spec.args_count < 2) {
173 ret = -EINVAL;
174 goto end;
175 }
176
177 max = cooling_spec.args[0];
178 if (thermal_zone_bind_cooling_device(thermal, i, cdev,
179 max, 0)) {
180 dev_err(data->dev,
181 "thermal error unbinding cdev inst=%d\n", i);
182
183 ret = -EINVAL;
184 goto end;
185 }
186 i++;
187 }
188 th_zone->bind = true;
189end:
190 of_node_put(child);
191 of_node_put(np);
192
193 return ret;
194}
195
196/* Unbind callback functions for thermal zone */
197static int exynos_unbind(struct thermal_zone_device *thermal,
198 struct thermal_cooling_device *cdev)
199{
200 int ret = 0, i;
201 struct exynos_thermal_zone *th_zone = thermal->devdata;
202 struct thermal_sensor_conf *data = th_zone->sensor_conf;
203 struct device_node *child, *gchild, *np;
204
205 if (th_zone->bind == false || !th_zone->cool_dev_size)
206 return 0;
207
208 /* find the cooling device registered*/
209 for (i = 0; i < th_zone->cool_dev_size; i++)
210 if (cdev == th_zone->cool_dev[i])
211 break;
212
213 /* No matching cooling device */
214 if (i == th_zone->cool_dev_size)
215 return 0;
216
217 np = of_find_node_by_path("/thermal-zones/cpu-thermal");
218 if (!np) {
219 pr_err("failed to find thmerla-zones/cpu-thermal node\n");
220 return -ENOENT;
221 }
222
223 child = of_get_child_by_name(np, "cooling-maps");
224
225 i = 0;
226 for_each_child_of_node(child, gchild) {
227 if (thermal_zone_unbind_cooling_device(thermal, i,
228 cdev)) {
229 dev_err(data->dev,
230 "error unbinding cdev inst=%d\n", i);
231 ret = -EINVAL;
232 goto end;
233 }
234 i++;
235 }
236 th_zone->bind = false;
237end:
238 of_node_put(child);
239 of_node_put(np);
240
241 return ret;
242}
243
244/* Get temperature callback functions for thermal zone */
245static int exynos_get_temp(struct thermal_zone_device *thermal,
246 unsigned long *temp)
247{
248 struct exynos_thermal_zone *th_zone = thermal->devdata;
249 void *data;
250
251 if (!th_zone->sensor_conf) {
252 dev_err(&thermal->device,
253 "Temperature sensor not initialised\n");
254 return -EINVAL;
255 }
256 data = th_zone->sensor_conf->driver_data;
257 *temp = th_zone->sensor_conf->read_temperature(data);
258 /* convert the temperature into millicelsius */
259 *temp = *temp * MCELSIUS;
260 return 0;
261}
262
263/* Get temperature callback functions for thermal zone */
264static int exynos_set_emul_temp(struct thermal_zone_device *thermal,
265 unsigned long temp)
266{
267 void *data;
268 int ret = -EINVAL;
269 struct exynos_thermal_zone *th_zone = thermal->devdata;
270
271 if (!th_zone->sensor_conf) {
272 dev_err(&thermal->device,
273 "Temperature sensor not initialised\n");
274 return -EINVAL;
275 }
276 data = th_zone->sensor_conf->driver_data;
277 if (th_zone->sensor_conf->write_emul_temp)
278 ret = th_zone->sensor_conf->write_emul_temp(data, temp);
279 return ret;
280}
281
282/* Get the temperature trend */
283static int exynos_get_trend(struct thermal_zone_device *thermal,
284 int trip, enum thermal_trend *trend)
285{
286 int ret;
287 unsigned long trip_temp;
288
289 ret = exynos_get_trip_temp(thermal, trip, &trip_temp);
290 if (ret < 0)
291 return ret;
292
293 if (thermal->temperature >= trip_temp)
294 *trend = THERMAL_TREND_RAISE_FULL;
295 else
296 *trend = THERMAL_TREND_DROP_FULL;
297
298 return 0;
299}
300/* Operation callback functions for thermal zone */
301static struct thermal_zone_device_ops exynos_dev_ops = {
302 .bind = exynos_bind,
303 .unbind = exynos_unbind,
304 .get_temp = exynos_get_temp,
305 .set_emul_temp = exynos_set_emul_temp,
306 .get_trend = exynos_get_trend,
307 .get_mode = exynos_get_mode,
308 .set_mode = exynos_set_mode,
309 .get_trip_type = exynos_get_trip_type,
310 .get_trip_temp = exynos_get_trip_temp,
311 .get_crit_temp = exynos_get_crit_temp,
312};
313
314/*
315 * This function may be called from interrupt based temperature sensor
316 * when threshold is changed.
317 */
318void exynos_report_trigger(struct thermal_sensor_conf *conf)
319{
320 unsigned int i;
321 char data[10];
322 char *envp[] = { data, NULL };
323 struct exynos_thermal_zone *th_zone;
324
325 if (!conf || !conf->pzone_data) {
326 pr_err("Invalid temperature sensor configuration data\n");
327 return;
328 }
329
330 th_zone = conf->pzone_data;
331
332 if (th_zone->bind == false) {
333 for (i = 0; i < th_zone->cool_dev_size; i++) {
334 if (!th_zone->cool_dev[i])
335 continue;
336 exynos_bind(th_zone->therm_dev,
337 th_zone->cool_dev[i]);
338 }
339 }
340
341 thermal_zone_device_update(th_zone->therm_dev);
342
343 mutex_lock(&th_zone->therm_dev->lock);
344 /* Find the level for which trip happened */
345 for (i = 0; i < th_zone->sensor_conf->trip_data.trip_count; i++) {
346 if (th_zone->therm_dev->last_temperature <
347 th_zone->sensor_conf->trip_data.trip_val[i] * MCELSIUS)
348 break;
349 }
350
351 if (th_zone->mode == THERMAL_DEVICE_ENABLED &&
352 !th_zone->sensor_conf->trip_data.trigger_falling) {
353 if (i > 0)
354 th_zone->therm_dev->polling_delay = ACTIVE_INTERVAL;
355 else
356 th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
357 }
358
359 snprintf(data, sizeof(data), "%u", i);
360 kobject_uevent_env(&th_zone->therm_dev->device.kobj, KOBJ_CHANGE, envp);
361 mutex_unlock(&th_zone->therm_dev->lock);
362}
363
364/* Register with the in-kernel thermal management */
365int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
366{
367 int ret;
368 struct exynos_thermal_zone *th_zone;
369
370 if (!sensor_conf || !sensor_conf->read_temperature) {
371 pr_err("Temperature sensor not initialised\n");
372 return -EINVAL;
373 }
374
375 th_zone = devm_kzalloc(sensor_conf->dev,
376 sizeof(struct exynos_thermal_zone), GFP_KERNEL);
377 if (!th_zone)
378 return -ENOMEM;
379
380 th_zone->sensor_conf = sensor_conf;
381 /*
382 * TODO: 1) Handle multiple cooling devices in a thermal zone
383 * 2) Add a flag/name in cooling info to map to specific
384 * sensor
385 */
386 if (sensor_conf->cooling_data.freq_clip_count > 0) {
387 th_zone->cool_dev[th_zone->cool_dev_size] =
388 cpufreq_cooling_register(cpu_present_mask);
389 if (IS_ERR(th_zone->cool_dev[th_zone->cool_dev_size])) {
390 ret = PTR_ERR(th_zone->cool_dev[th_zone->cool_dev_size]);
391 if (ret != -EPROBE_DEFER)
392 dev_err(sensor_conf->dev,
393 "Failed to register cpufreq cooling device: %d\n",
394 ret);
395 goto err_unregister;
396 }
397 th_zone->cool_dev_size++;
398 }
399
400 th_zone->therm_dev = thermal_zone_device_register(
401 sensor_conf->name, sensor_conf->trip_data.trip_count,
402 0, th_zone, &exynos_dev_ops, NULL, 0,
403 sensor_conf->trip_data.trigger_falling ? 0 :
404 IDLE_INTERVAL);
405
406 if (IS_ERR(th_zone->therm_dev)) {
407 dev_err(sensor_conf->dev,
408 "Failed to register thermal zone device\n");
409 ret = PTR_ERR(th_zone->therm_dev);
410 goto err_unregister;
411 }
412 th_zone->mode = THERMAL_DEVICE_ENABLED;
413 sensor_conf->pzone_data = th_zone;
414
415 dev_info(sensor_conf->dev,
416 "Exynos: Thermal zone(%s) registered\n", sensor_conf->name);
417
418 return 0;
419
420err_unregister:
421 exynos_unregister_thermal(sensor_conf);
422 return ret;
423}
424
425/* Un-Register with the in-kernel thermal management */
426void exynos_unregister_thermal(struct thermal_sensor_conf *sensor_conf)
427{
428 int i;
429 struct exynos_thermal_zone *th_zone;
430
431 if (!sensor_conf || !sensor_conf->pzone_data) {
432 pr_err("Invalid temperature sensor configuration data\n");
433 return;
434 }
435
436 th_zone = sensor_conf->pzone_data;
437
438 thermal_zone_device_unregister(th_zone->therm_dev);
439
440 for (i = 0; i < th_zone->cool_dev_size; ++i)
441 cpufreq_cooling_unregister(th_zone->cool_dev[i]);
442
443 dev_info(sensor_conf->dev,
444 "Exynos: Kernel Thermal management unregistered\n");
445}
diff --git a/drivers/thermal/samsung/exynos_thermal_common.h b/drivers/thermal/samsung/exynos_thermal_common.h
deleted file mode 100644
index cd4471925cdd..000000000000
--- a/drivers/thermal/samsung/exynos_thermal_common.h
+++ /dev/null
@@ -1,106 +0,0 @@
1/*
2 * exynos_thermal_common.h - Samsung EXYNOS common header file
3 *
4 * Copyright (C) 2013 Samsung Electronics
5 * Amit Daniel Kachhap <amit.daniel@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23#ifndef _EXYNOS_THERMAL_COMMON_H
24#define _EXYNOS_THERMAL_COMMON_H
25
26/* In-kernel thermal framework related macros & definations */
27#define SENSOR_NAME_LEN 16
28#define MAX_TRIP_COUNT 8
29#define MAX_COOLING_DEVICE 4
30
31#define ACTIVE_INTERVAL 500
32#define IDLE_INTERVAL 10000
33#define MCELSIUS 1000
34
35/* CPU Zone information */
36#define PANIC_ZONE 4
37#define WARN_ZONE 3
38#define MONITOR_ZONE 2
39#define SAFE_ZONE 1
40
41#define GET_ZONE(trip) (trip + 2)
42#define GET_TRIP(zone) (zone - 2)
43
44enum trigger_type {
45 THROTTLE_ACTIVE = 1,
46 THROTTLE_PASSIVE,
47 SW_TRIP,
48 HW_TRIP,
49};
50
51/**
52 * struct freq_clip_table
53 * @freq_clip_max: maximum frequency allowed for this cooling state.
54 * @temp_level: Temperature level at which the temperature clipping will
55 * happen.
56 * @mask_val: cpumask of the allowed cpu's where the clipping will take place.
57 *
58 * This structure is required to be filled and passed to the
59 * cpufreq_cooling_unregister function.
60 */
61struct freq_clip_table {
62 unsigned int freq_clip_max;
63 unsigned int temp_level;
64 const struct cpumask *mask_val;
65};
66
67struct thermal_trip_point_conf {
68 int trip_val[MAX_TRIP_COUNT];
69 int trip_type[MAX_TRIP_COUNT];
70 int trip_count;
71 unsigned char trigger_falling;
72};
73
74struct thermal_cooling_conf {
75 struct freq_clip_table freq_data[MAX_TRIP_COUNT];
76 int freq_clip_count;
77};
78
79struct thermal_sensor_conf {
80 char name[SENSOR_NAME_LEN];
81 int (*read_temperature)(void *data);
82 int (*write_emul_temp)(void *drv_data, unsigned long temp);
83 struct thermal_trip_point_conf trip_data;
84 struct thermal_cooling_conf cooling_data;
85 void *driver_data;
86 void *pzone_data;
87 struct device *dev;
88};
89
90/*Functions used exynos based thermal sensor driver*/
91#ifdef CONFIG_EXYNOS_THERMAL_CORE
92void exynos_unregister_thermal(struct thermal_sensor_conf *sensor_conf);
93int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf);
94void exynos_report_trigger(struct thermal_sensor_conf *sensor_conf);
95#else
96static inline void
97exynos_unregister_thermal(struct thermal_sensor_conf *sensor_conf) { return; }
98
99static inline int
100exynos_register_thermal(struct thermal_sensor_conf *sensor_conf) { return 0; }
101
102static inline void
103exynos_report_trigger(struct thermal_sensor_conf *sensor_conf) { return; }
104
105#endif /* CONFIG_EXYNOS_THERMAL_CORE */
106#endif /* _EXYNOS_THERMAL_COMMON_H */
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/*
 * linux/ipc/shm.c
 * Copyright (C) 1992, 1993 Krishna Balasubramanian
 *	 Many improvements/fixes by Bruno Haible.
 * Replaced `struct shm_desc' by `struct vm_area_struct', July 1994.
 * Fixed the shm swap deallocation (shm_unuse()), August 1998 Andrea Arcangeli.
 *
 * /proc/sysvipc/shm support (c) 1999 Dragos Acostachioaie <dragos@iname.com>
 * BIGMEM support, Andrea Arcangeli <andrea@suse.de>
 * SMP thread shm, Jean-Luc Boyard <jean-luc.boyard@siemens.fr>
 * HIGHMEM support, Ingo Molnar <mingo@redhat.com>
 * Make shmmax, shmall, shmmni sysctl'able, Christoph Rohland <cr@sap.com>
 * Shared /dev/zero support, Kanoj Sarcar <kanoj@sgi.com>
 * Move the mm functionality over to mm/shmem.c, Christoph Rohland <cr@sap.com>
 *
 * support for audit of ipc object properties and permission changes
 * Dustin Kirkland <dustin.kirkland@us.ibm.com>
 *
 * namespaces support
 * OpenVZ, SWsoft Inc.
 * Pavel Emelianov <xemul@openvz.org>
 */

#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/shm.h>
#include <linux/init.h>
#include <linux/file.h>
#include <linux/mman.h>
#include <linux/shmem_fs.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/audit.h>
#include <linux/capability.h>
#include <linux/ptrace.h>
#include <linux/seq_file.h>
#include <linux/rwsem.h>
#include <linux/nsproxy.h>
#include <linux/mount.h>
#include <linux/ipc_namespace.h>

#include <asm/uaccess.h>

#include "util.h"

struct shm_file_data {
	int id;
	struct ipc_namespace *ns;
	struct file *file;
	const struct vm_operations_struct *vm_ops;
};

#define shm_file_data(file) (*((struct shm_file_data **)&(file)->private_data))

static const struct file_operations shm_file_operations;
static const struct vm_operations_struct shm_vm_ops;

#define shm_ids(ns)	((ns)->ids[IPC_SHM_IDS])

#define shm_unlock(shp)			\
	ipc_unlock(&(shp)->shm_perm)

static int newseg(struct ipc_namespace *, struct ipc_params *);
static void shm_open(struct vm_area_struct *vma);
static void shm_close(struct vm_area_struct *vma);
static void shm_destroy (struct ipc_namespace *ns, struct shmid_kernel *shp);
#ifdef CONFIG_PROC_FS
static int sysvipc_shm_proc_show(struct seq_file *s, void *it);
#endif

void shm_init_ns(struct ipc_namespace *ns)
{
	ns->shm_ctlmax = SHMMAX;
	ns->shm_ctlall = SHMALL;
	ns->shm_ctlmni = SHMMNI;
	ns->shm_tot = 0;
	ipc_init_ids(&shm_ids(ns));
}

/*
 * Called with shm_ids.rw_mutex (writer) and the shp structure locked.
 * Only shm_ids.rw_mutex remains locked on exit.
 */
static void do_shm_rmid(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
{
	struct shmid_kernel *shp;
	shp = container_of(ipcp, struct shmid_kernel, shm_perm);

	if (shp->shm_nattch){
		shp->shm_perm.mode |= SHM_DEST;
		/* Do not find it any more */
		shp->shm_perm.key = IPC_PRIVATE;
		shm_unlock(shp);
	} else
		shm_destroy(ns, shp);
}

#ifdef CONFIG_IPC_NS
void shm_exit_ns(struct ipc_namespace *ns)
{
	free_ipcs(ns, &shm_ids(ns), do_shm_rmid);
	idr_destroy(&ns->ids[IPC_SHM_IDS].ipcs_idr);
}
#endif

void __init shm_init (void)
{
	shm_init_ns(&init_ipc_ns);
	ipc_init_proc_interface("sysvipc/shm",
#if BITS_PER_LONG <= 32
				"       key      shmid perms       size  cpid  lpid nattch   uid   gid  cuid  cgid      atime      dtime      ctime        rss       swap\n",
#else
				"       key      shmid perms                  size  cpid  lpid nattch   uid   gid  cuid  cgid      atime      dtime      ctime                   rss                  swap\n",
#endif
				IPC_SHM_IDS, sysvipc_shm_proc_show);
}

/*
 * shm_lock_(check_) routines are called in the paths where the rw_mutex
 * is not necessarily held.
 */
static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id)
{
	struct kern_ipc_perm *ipcp = ipc_lock(&shm_ids(ns), id);

	if (IS_ERR(ipcp))
		return (struct shmid_kernel *)ipcp;

	return container_of(ipcp, struct shmid_kernel, shm_perm);
}

static inline struct shmid_kernel *shm_lock_check(struct ipc_namespace *ns,
						int id)
{
	struct kern_ipc_perm *ipcp = ipc_lock_check(&shm_ids(ns), id);

	if (IS_ERR(ipcp))
		return (struct shmid_kernel *)ipcp;

	return container_of(ipcp, struct shmid_kernel, shm_perm);
}

static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s)
{
	ipc_rmid(&shm_ids(ns), &s->shm_perm);
}


/* This is called by fork, once for every shm attach. */
static void shm_open(struct vm_area_struct *vma)
{
	struct file *file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);
	struct shmid_kernel *shp;

	shp = shm_lock(sfd->ns, sfd->id);
	BUG_ON(IS_ERR(shp));
	shp->shm_atim = get_seconds();
	shp->shm_lprid = task_tgid_vnr(current);
	shp->shm_nattch++;
	shm_unlock(shp);
}

/*
 * shm_destroy - free the struct shmid_kernel
 *
 * @ns: namespace
 * @shp: struct to free
 *
 * It has to be called with shp and shm_ids.rw_mutex (writer) locked,
 * but returns with shp unlocked and freed.
 */
static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
{
	ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
	shm_rmid(ns, shp);
	shm_unlock(shp);
	if (!is_file_hugepages(shp->shm_file))
		shmem_lock(shp->shm_file, 0, shp->mlock_user);
	else if (shp->mlock_user)
		user_shm_unlock(shp->shm_file->f_path.dentry->d_inode->i_size,
						shp->mlock_user);
	fput (shp->shm_file);
	security_shm_free(shp);
	ipc_rcu_putref(shp);
}

/*
 * remove the attach descriptor vma.
 * free memory for segment if it is marked destroyed.
 * The descriptor has already been removed from the current->mm->mmap list
 * and will later be kfree()d.
 */
static void shm_close(struct vm_area_struct *vma)
{
	struct file * file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);
	struct shmid_kernel *shp;
	struct ipc_namespace *ns = sfd->ns;

	down_write(&shm_ids(ns).rw_mutex);
	/* remove from the list of attaches of the shm segment */
	shp = shm_lock(ns, sfd->id);
	BUG_ON(IS_ERR(shp));
	shp->shm_lprid = task_tgid_vnr(current);
	shp->shm_dtim = get_seconds();
	shp->shm_nattch--;
	if(shp->shm_nattch == 0 &&
	   shp->shm_perm.mode & SHM_DEST)
		shm_destroy(ns, shp);
	else
		shm_unlock(shp);
	up_write(&shm_ids(ns).rw_mutex);
}

static int shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
	struct file *file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);

	return sfd->vm_ops->fault(vma, vmf);
}

#ifdef CONFIG_NUMA
static int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new)
{
	struct file *file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);
	int err = 0;
	if (sfd->vm_ops->set_policy)
		err = sfd->vm_ops->set_policy(vma, new);
	return err;
}

static struct mempolicy *shm_get_policy(struct vm_area_struct *vma,
					unsigned long addr)
{
	struct file *file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);
	struct mempolicy *pol = NULL;

	if (sfd->vm_ops->get_policy)
		pol = sfd->vm_ops->get_policy(vma, addr);
	else if (vma->vm_policy)
		pol = vma->vm_policy;

	return pol;
}
#endif

static int shm_mmap(struct file * file, struct vm_area_struct * vma)
{
	struct shm_file_data *sfd = shm_file_data(file);
	int ret;

	ret = sfd->file->f_op->mmap(sfd->file, vma);
	if (ret != 0)
		return ret;
	sfd->vm_ops = vma->vm_ops;
#ifdef CONFIG_MMU
	BUG_ON(!sfd->vm_ops->fault);
#endif
	vma->vm_ops = &shm_vm_ops;
	shm_open(vma);

	return ret;
}

static int shm_release(struct inode *ino, struct file *file)
{
	struct shm_file_data *sfd = shm_file_data(file);

	put_ipc_ns(sfd->ns);
	shm_file_data(file) = NULL;
	kfree(sfd);
	return 0;
}

static int shm_fsync(struct file *file, int datasync)
{
	struct shm_file_data *sfd = shm_file_data(file);

	if (!sfd->file->f_op->fsync)
		return -EINVAL;
	return sfd->file->f_op->fsync(sfd->file, datasync);
}

static unsigned long shm_get_unmapped_area(struct file *file,
	unsigned long addr, unsigned long len, unsigned long pgoff,
	unsigned long flags)
{
	struct shm_file_data *sfd = shm_file_data(file);
	return sfd->file->f_op->get_unmapped_area(sfd->file, addr, len,
						pgoff, flags);
}

static const struct file_operations shm_file_operations = {
	.mmap		= shm_mmap,
	.fsync		= shm_fsync,
	.release	= shm_release,
#ifndef CONFIG_MMU
	.get_unmapped_area	= shm_get_unmapped_area,
#endif
	.llseek		= noop_llseek,
};

static const struct file_operations shm_file_operations_huge = {
	.mmap		= shm_mmap,
	.fsync		= shm_fsync,
	.release	= shm_release,
	.get_unmapped_area	= shm_get_unmapped_area,
	.llseek		= noop_llseek,
};

int is_file_shm_hugepages(struct file *file)
{
	return file->f_op == &shm_file_operations_huge;
}

static const struct vm_operations_struct shm_vm_ops = {
	.open	= shm_open,	/* callback for a new vm-area open */
	.close	= shm_close,	/* callback for when the vm-area is released */
	.fault	= shm_fault,
#if defined(CONFIG_NUMA)
	.set_policy = shm_set_policy,
	.get_policy = shm_get_policy,
#endif
};

/**
 * newseg - Create a new shared memory segment
 * @ns: namespace
 * @params: ptr to the structure that contains key, size and shmflg
 *
 * Called with shm_ids.rw_mutex held as a writer.
 */

static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
{
	key_t key = params->key;
	int shmflg = params->flg;
	size_t size = params->u.size;
	int error;
	struct shmid_kernel *shp;
	int numpages = (size + PAGE_SIZE -1) >> PAGE_SHIFT;
	struct file * file;
	char name[13];
	int id;
	int acctflag = 0;

	if (size < SHMMIN || size > ns->shm_ctlmax)
		return -EINVAL;

	if (ns->shm_tot + numpages > ns->shm_ctlall)
		return -ENOSPC;

	shp = ipc_rcu_alloc(sizeof(*shp));
	if (!shp)
		return -ENOMEM;

	shp->shm_perm.key = key;
	shp->shm_perm.mode = (shmflg & S_IRWXUGO);
	shp->mlock_user = NULL;

	shp->shm_perm.security = NULL;
	error = security_shm_alloc(shp);
	if (error) {
		ipc_rcu_putref(shp);
		return error;
	}

	sprintf (name, "SYSV%08x", key);
	if (shmflg & SHM_HUGETLB) {
		/* hugetlb_file_setup applies strict accounting */
		if (shmflg & SHM_NORESERVE)
			acctflag = VM_NORESERVE;
		file = hugetlb_file_setup(name, size, acctflag,
					&shp->mlock_user, HUGETLB_SHMFS_INODE);
	} else {
		/*
		 * Do not allow no accounting for OVERCOMMIT_NEVER, even
	 	 * if it's asked for.
		 */
		if  ((shmflg & SHM_NORESERVE) &&
				sysctl_overcommit_memory != OVERCOMMIT_NEVER)
			acctflag = VM_NORESERVE;
		file = shmem_file_setup(name, size, acctflag);
	}
	error = PTR_ERR(file);
	if (IS_ERR(file))
		goto no_file;

	id = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
	if (id < 0) {
		error = id;
		goto no_id;
	}

	shp->shm_cprid = task_tgid_vnr(current);
	shp->shm_lprid = 0;
	shp->shm_atim = shp->shm_dtim = 0;
	shp->shm_ctim = get_seconds();
	shp->shm_segsz = size;
	shp->shm_nattch = 0;
	shp->shm_file = file;
	/*
	 * shmid gets reported as "inode#" in /proc/pid/maps.
	 * proc-ps tools use this. Changing this will break them.
	 */
	file->f_dentry->d_inode->i_ino = shp->shm_perm.id;

	ns->shm_tot += numpages;
	error = shp->shm_perm.id;
	shm_unlock(shp);
	return error;

no_id:
	if (is_file_hugepages(file) && shp->mlock_user)
		user_shm_unlock(size, shp->mlock_user);
	fput(file);
no_file:
	security_shm_free(shp);
	ipc_rcu_putref(shp);
	return error;
}

/*
 * Called with shm_ids.rw_mutex and ipcp locked.
 */
static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg)
{
	struct shmid_kernel *shp;

	shp = container_of(ipcp, struct shmid_kernel, shm_perm);
	return security_shm_associate(shp, shmflg);
}

/*
 * Called with shm_ids.rw_mutex and ipcp locked.
 */
static inline int shm_more_checks(struct kern_ipc_perm *ipcp,
				struct ipc_params *params)
{
	struct shmid_kernel *shp;

	shp = container_of(ipcp, struct shmid_kernel, shm_perm);
	if (shp->shm_segsz < params->u.size)
		return -EINVAL;

	return 0;
}

SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg)
{
	struct ipc_namespace *ns;
	struct ipc_ops shm_ops;
	struct ipc_params shm_params;

	ns = current->nsproxy->ipc_ns;

	shm_ops.getnew = newseg;
	shm_ops.associate = shm_security;
	shm_ops.more_checks = shm_more_checks;

	shm_params.key = key;
	shm_params.flg = shmflg;
	shm_params.u.size = size;

	return ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params);
}

static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version)
{
	switch(version) {
	case IPC_64:
		return copy_to_user(buf, in, sizeof(*in));
	case IPC_OLD:
	    {
		struct shmid_ds out;

		memset(&out, 0, sizeof(out));
		ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
		out.shm_segsz	= in->shm_segsz;
		out.shm_atime	= in->shm_atime;
		out.shm_dtime	= in->shm_dtime;
		out.shm_ctime	= in->shm_ctime;
		out.shm_cpid	= in->shm_cpid;
		out.shm_lpid	= in->shm_lpid;
		out.shm_nattch	= in->shm_nattch;

		return copy_to_user(buf, &out, sizeof(out));
	    }
	default:
		return -EINVAL;
	}
}

static inline unsigned long
copy_shmid_from_user(struct shmid64_ds *out, void __user *buf, int version)
{
	switch(version) {
	case IPC_64:
		if (copy_from_user(out, buf, sizeof(*out)))
			return -EFAULT;
		return 0;
	case IPC_OLD:
	    {
		struct shmid_ds tbuf_old;

		if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
			return -EFAULT;

		out->shm_perm.uid	= tbuf_old.shm_perm.uid;
		out->shm_perm.gid	= tbuf_old.shm_perm.gid;
		out->shm_perm.mode	= tbuf_old.shm_perm.mode;

		return 0;
	    }
	default:
		return -EINVAL;
	}
}

static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version)
{
	switch(version) {
	case IPC_64:
		return copy_to_user(buf, in, sizeof(*in));
	case IPC_OLD:
	    {
		struct shminfo out;

		if(in->shmmax > INT_MAX)
			out.shmmax = INT_MAX;
		else
			out.shmmax = (int)in->shmmax;

		out.shmmin	= in->shmmin;
		out.shmmni	= in->shmmni;
		out.shmseg	= in->shmseg;
		out.shmall	= in->shmall; 

		return copy_to_user(buf, &out, sizeof(out));
	    }
	default:
		return -EINVAL;
	}
}

/*
 * Calculate and add used RSS and swap pages of a shm.
 * Called with shm_ids.rw_mutex held as a reader
 */
static void shm_add_rss_swap(struct shmid_kernel *shp,
	unsigned long *rss_add, unsigned long *swp_add)
{
	struct inode *inode;

	inode = shp->shm_file->f_path.dentry->d_inode;

	if (is_file_hugepages(shp->shm_file)) {
		struct address_space *mapping = inode->i_mapping;
		struct hstate *h = hstate_file(shp->shm_file);
		*rss_add += pages_per_huge_page(h) * mapping->nrpages;
	} else {
#ifdef CONFIG_SHMEM
		struct shmem_inode_info *info = SHMEM_I(inode);
		spin_lock(&info->lock);
		*rss_add += inode->i_mapping->nrpages;
		*swp_add += info->swapped;
		spin_unlock(&info->lock);
#else
		*rss_add += inode->i_mapping->nrpages;
#endif
	}
}

/*
 * Called with shm_ids.rw_mutex held as a reader
 */
static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
		unsigned long *swp)
{
	int next_id;
	int total, in_use;

	*rss = 0;
	*swp = 0;

	in_use = shm_ids(ns).in_use;

	for (total = 0, next_id = 0; total < in_use; next_id++) {
		struct kern_ipc_perm *ipc;
		struct shmid_kernel *shp;

		ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id);
		if (ipc == NULL)
			continue;
		shp = container_of(ipc, struct shmid_kernel, shm_perm);

		shm_add_rss_swap(shp, rss, swp);

		total++;
	}
}

/*
 * This function handles some shmctl commands which require the rw_mutex
 * to be held in write mode.
 * NOTE: no locks must be held, the rw_mutex is taken inside this function.
 */
static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
		       struct shmid_ds __user *buf, int version)
{
	struct kern_ipc_perm *ipcp;
	struct shmid64_ds shmid64;
	struct shmid_kernel *shp;
	int err;

	if (cmd == IPC_SET) {
		if (copy_shmid_from_user(&shmid64, buf, version))
			return -EFAULT;
	}

	ipcp = ipcctl_pre_down(ns, &shm_ids(ns), shmid, cmd,
			       &shmid64.shm_perm, 0);
	if (IS_ERR(ipcp))
		return PTR_ERR(ipcp);

	shp = container_of(ipcp, struct shmid_kernel, shm_perm);

	err = security_shm_shmctl(shp, cmd);
	if (err)
		goto out_unlock;
	switch (cmd) {
	case IPC_RMID:
		do_shm_rmid(ns, ipcp);
		goto out_up;
	case IPC_SET:
		ipc_update_perm(&shmid64.shm_perm, ipcp);
		shp->shm_ctim = get_seconds();
		break;
	default:
		err = -EINVAL;
	}
out_unlock:
	shm_unlock(shp);
out_up:
	up_write(&shm_ids(ns).rw_mutex);
	return err;
}

SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
{
	struct shmid_kernel *shp;
	int err, version;
	struct ipc_namespace *ns;

	if (cmd < 0 || shmid < 0) {
		err = -EINVAL;
		goto out;
	}

	version = ipc_parse_version(&cmd);
	ns = current->nsproxy->ipc_ns;

	switch (cmd) { /* replace with proc interface ? */
	case IPC_INFO:
	{
		struct shminfo64 shminfo;

		err = security_shm_shmctl(NULL, cmd);
		if (err)
			return err;

		memset(&shminfo, 0, sizeof(shminfo));
		shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;
		shminfo.shmmax = ns->shm_ctlmax;
		shminfo.shmall = ns->shm_ctlall;

		shminfo.shmmin = SHMMIN;
		if(copy_shminfo_to_user (buf, &shminfo, version))
			return -EFAULT;

		down_read(&shm_ids(ns).rw_mutex);
		err = ipc_get_maxid(&shm_ids(ns));
		up_read(&shm_ids(ns).rw_mutex);

		if(err<0)
			err = 0;
		goto out;
	}
	case SHM_INFO:
	{
		struct shm_info shm_info;

		err = security_shm_shmctl(NULL, cmd);
		if (err)
			return err;

		memset(&shm_info, 0, sizeof(shm_info));
		down_read(&shm_ids(ns).rw_mutex);
		shm_info.used_ids = shm_ids(ns).in_use;
		shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp);
		shm_info.shm_tot = ns->shm_tot;
		shm_info.swap_attempts = 0;
		shm_info.swap_successes = 0;
		err = ipc_get_maxid(&shm_ids(ns));
		up_read(&shm_ids(ns).rw_mutex);
		if (copy_to_user(buf, &shm_info, sizeof(shm_info))) {
			err = -EFAULT;
			goto out;
		}

		err = err < 0 ? 0 : err;
		goto out;
	}
	case SHM_STAT:
	case IPC_STAT:
	{
		struct shmid64_ds tbuf;
		int result;

		if (cmd == SHM_STAT) {
			shp = shm_lock(ns, shmid);
			if (IS_ERR(shp)) {
				err = PTR_ERR(shp);
				goto out;
			}
			result = shp->shm_perm.id;
		} else {
			shp = shm_lock_check(ns, shmid);
			if (IS_ERR(shp)) {
				err = PTR_ERR(shp);
				goto out;
			}
			result = 0;
		}
		err = -EACCES;
		if (ipcperms(ns, &shp->shm_perm, S_IRUGO))
			goto out_unlock;
		err = security_shm_shmctl(shp, cmd);
		if (err)
			goto out_unlock;
		memset(&tbuf, 0, sizeof(tbuf));
		kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm);
		tbuf.shm_segsz	= shp->shm_segsz;
		tbuf.shm_atime	= shp->shm_atim;
		tbuf.shm_dtime	= shp->shm_dtim;
		tbuf.shm_ctime	= shp->shm_ctim;
		tbuf.shm_cpid	= shp->shm_cprid;
		tbuf.shm_lpid	= shp->shm_lprid;
		tbuf.shm_nattch	= shp->shm_nattch;
		shm_unlock(shp);
		if(copy_shmid_to_user (buf, &tbuf, version))
			err = -EFAULT;
		else
			err = result;
		goto out;
	}
	case SHM_LOCK:
	case SHM_UNLOCK:
	{
		struct file *uninitialized_var(shm_file);

		lru_add_drain_all();  /* drain pagevecs to lru lists */

		shp = shm_lock_check(ns, shmid);
		if (IS_ERR(shp)) {
			err = PTR_ERR(shp);
			goto out;
		}

		audit_ipc_obj(&(shp->shm_perm));

		if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) {
			uid_t euid = current_euid();
			err = -EPERM;
			if (euid != shp->shm_perm.uid &&
			    euid != shp->shm_perm.cuid)
				goto out_unlock;
			if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK))
				goto out_unlock;
		}

		err = security_shm_shmctl(shp, cmd);
		if (err)
			goto out_unlock;
		
		if(cmd==SHM_LOCK) {
			struct user_struct *user = current_user();
			if (!is_file_hugepages(shp->shm_file)) {
				err = shmem_lock(shp->shm_file, 1, user);
				if (!err && !(shp->shm_perm.mode & SHM_LOCKED)){
					shp->shm_perm.mode |= SHM_LOCKED;
					shp->mlock_user = user;
				}
			}
		} else if (!is_file_hugepages(shp->shm_file)) {
			shmem_lock(shp->shm_file, 0, shp->mlock_user);
			shp->shm_perm.mode &= ~SHM_LOCKED;
			shp->mlock_user = NULL;
		}
		shm_unlock(shp);
		goto out;
	}
	case IPC_RMID:
	case IPC_SET:
		err = shmctl_down(ns, shmid, cmd, buf, version);
		return err;
	default:
		return -EINVAL;
	}

out_unlock:
	shm_unlock(shp);
out:
	return err;
}

/*
 * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists.
 *
 * NOTE! Despite the name, this is NOT a direct system call entrypoint. The
 * "raddr" thing points to kernel space, and there has to be a wrapper around
 * this.
 */
long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
{
	struct shmid_kernel *shp;
	unsigned long addr;
	unsigned long size;
	struct file * file;
	int    err;
	unsigned long flags;
	unsigned long prot;
	int acc_mode;
	unsigned long user_addr;
	struct ipc_namespace *ns;
	struct shm_file_data *sfd;
	struct path path;
	fmode_t f_mode;

	err = -EINVAL;
	if (shmid < 0)
		goto out;
	else if ((addr = (ulong)shmaddr)) {
		if (addr & (SHMLBA-1)) {
			if (shmflg & SHM_RND)
				addr &= ~(SHMLBA-1);	   /* round down */
			else
#ifndef __ARCH_FORCE_SHMLBA
				if (addr & ~PAGE_MASK)
#endif
					goto out;
		}
		flags = MAP_SHARED | MAP_FIXED;
	} else {
		if ((shmflg & SHM_REMAP))
			goto out;

		flags = MAP_SHARED;
	}

	if (shmflg & SHM_RDONLY) {
		prot = PROT_READ;
		acc_mode = S_IRUGO;
		f_mode = FMODE_READ;
	} else {
		prot = PROT_READ | PROT_WRITE;
		acc_mode = S_IRUGO | S_IWUGO;
		f_mode = FMODE_READ | FMODE_WRITE;
	}
	if (shmflg & SHM_EXEC) {
		prot |= PROT_EXEC;
		acc_mode |= S_IXUGO;
	}

	/*
	 * We cannot rely on the fs check since SYSV IPC does have an
	 * additional creator id...
	 */
	ns = current->nsproxy->ipc_ns;
	shp = shm_lock_check(ns, shmid);
	if (IS_ERR(shp)) {
		err = PTR_ERR(shp);
		goto out;
	}

	err = -EACCES;
	if (ipcperms(ns, &shp->shm_perm, acc_mode))
		goto out_unlock;

	err = security_shm_shmat(shp, shmaddr, shmflg);
	if (err)
		goto out_unlock;

	path = shp->shm_file->f_path;
	path_get(&path);
	shp->shm_nattch++;
	size = i_size_read(path.dentry->d_inode);
	shm_unlock(shp);

	err = -ENOMEM;
	sfd = kzalloc(sizeof(*sfd), GFP_KERNEL);
	if (!sfd)
		goto out_put_dentry;

	file = alloc_file(&path, f_mode,
			  is_file_hugepages(shp->shm_file) ?
				&shm_file_operations_huge :
				&shm_file_operations);
	if (!file)
		goto out_free;

	file->private_data = sfd;
	file->f_mapping = shp->shm_file->f_mapping;
	sfd->id = shp->shm_perm.id;
	sfd->ns = get_ipc_ns(ns);
	sfd->file = shp->shm_file;
	sfd->vm_ops = NULL;

	down_write(&current->mm->mmap_sem);
	if (addr && !(shmflg & SHM_REMAP)) {
		err = -EINVAL;
		if (find_vma_intersection(current->mm, addr, addr + size))
			goto invalid;
		/*
		 * If shm segment goes below stack, make sure there is some
		 * space left for the stack to grow (at least 4 pages).
		 */
		if (addr < current->mm->start_stack &&
		    addr > current->mm->start_stack - size - PAGE_SIZE * 5)
			goto invalid;
	}
		
	user_addr = do_mmap (file, addr, size, prot, flags, 0);
	*raddr = user_addr;
	err = 0;
	if (IS_ERR_VALUE(user_addr))
		err = (long)user_addr;
invalid:
	up_write(&current->mm->mmap_sem);

	fput(file);

out_nattch:
	down_write(&shm_ids(ns).rw_mutex);
	shp = shm_lock(ns, shmid);
	BUG_ON(IS_ERR(shp));
	shp->shm_nattch--;
	if(shp->shm_nattch == 0 &&
	   shp->shm_perm.mode & SHM_DEST)
		shm_destroy(ns, shp);
	else
		shm_unlock(shp);
	up_write(&shm_ids(ns).rw_mutex);

out:
	return err;

out_unlock:
	shm_unlock(shp);
	goto out;

out_free:
	kfree(sfd);
out_put_dentry:
	path_put(&path);
	goto out_nattch;
}

SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg)
{
	unsigned long ret;
	long err;

	err = do_shmat(shmid, shmaddr, shmflg, &ret);
	if (err)
		return err;
	force_successful_syscall_return();
	return (long)ret;
}

/*
 * detach and kill segment if marked destroyed.
 * The work is done in shm_close.
 */
SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
{
	struct mm_struct *mm = current->mm;
	struct vm_area_struct *vma;
	unsigned long addr = (unsigned long)shmaddr;
	int retval = -EINVAL;
#ifdef CONFIG_MMU
	loff_t size = 0;
	struct vm_area_struct *next;
#endif

	if (addr & ~PAGE_MASK)
		return retval;

	down_write(&mm->mmap_sem);

	/*
	 * This function tries to be smart and unmap shm segments that
	 * were modified by partial mlock or munmap calls:
	 * - It first determines the size of the shm segment that should be
	 *   unmapped: It searches for a vma that is backed by shm and that
	 *   started at address shmaddr. It records it's size and then unmaps
	 *   it.
	 * - Then it unmaps all shm vmas that started at shmaddr and that
	 *   are within the initially determined size.
	 * Errors from do_munmap are ignored: the function only fails if
	 * it's called with invalid parameters or if it's called to unmap
	 * a part of a vma. Both calls in this function are for full vmas,
	 * the parameters are directly copied from the vma itself and always
	 * valid - therefore do_munmap cannot fail. (famous last words?)
	 */
	/*
	 * If it had been mremap()'d, the starting address would not
	 * match the usual checks anyway. So assume all vma's are
	 * above the starting address given.
	 */
	vma = find_vma(mm, addr);

#ifdef CONFIG_MMU
	while (vma) {
		next = vma->vm_next;

		/*
		 * Check if the starting address would match, i.e. it's