Home » Mailing lists » Devel » [PATCH] IPC namespace
| [PATCH 5/6] IPC namespace - shm [message #3673 is a reply to message #3668] |
Fri, 09 June 2006 15:09   |
Kirill Korotaev
Messages: 137
Registered: January 2006
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Senior Member |
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IPC namespace support for IPC shm code.
Signed-Off-By: Pavel Emelianiov <xemul@openvz.org>
Signed-Off-By: Kirill Korotaev <dev@openvz.org>
--- ./ipc/shm.c.ipcns 2006-06-06 14:47:58.000000000 +0400
+++ ./ipc/shm.c 2006-06-09 14:25:34.000000000 +0400
@@ -15,6 +15,10 @@
*
* 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/config.h>
@@ -33,6 +37,7 @@
#include <linux/ptrace.h>
#include <linux/seq_file.h>
#include <linux/mutex.h>
+#include <linux/nsproxy.h>
#include <asm/uaccess.h>
@@ -41,59 +46,115 @@
static struct file_operations shm_file_operations;
static struct vm_operations_struct shm_vm_ops;
-static struct ipc_ids shm_ids;
+static struct ipc_ids init_shm_ids;
-#define shm_lock(id) ((struct shmid_kernel*)ipc_lock(&shm_ids,id))
-#define shm_unlock(shp) ipc_unlock(&(shp)->shm_perm)
-#define shm_get(id) ((struct shmid_kernel*)ipc_get(&shm_ids,id))
-#define shm_buildid(id, seq) \
- ipc_buildid(&shm_ids, id, seq)
+#define shm_ids(ns) (*((ns)->ids[IPC_SHM_IDS]))
-static int newseg (key_t key, int shmflg, size_t size);
+#define shm_lock(ns, id) \
+ ((struct shmid_kernel*)ipc_lock(&shm_ids(ns),id))
+#define shm_unlock(shp) \
+ ipc_unlock(&(shp)->shm_perm)
+#define shm_get(ns, id) \
+ ((struct shmid_kernel*)ipc_get(&shm_ids(ns),id))
+#define shm_buildid(ns, id, seq) \
+ ipc_buildid(&shm_ids(ns), id, seq)
+
+static int newseg (struct ipc_namespace *ns, key_t key,
+ int shmflg, size_t size);
static void shm_open (struct vm_area_struct *shmd);
static void shm_close (struct vm_area_struct *shmd);
+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
-size_t shm_ctlmax = SHMMAX;
-size_t shm_ctlall = SHMALL;
-int shm_ctlmni = SHMMNI;
+static void __ipc_init __shm_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
+{
+ ns->ids[IPC_SHM_IDS] = ids;
+ ns->shm_ctlmax = SHMMAX;
+ ns->shm_ctlall = SHMALL;
+ ns->shm_ctlmni = SHMMNI;
+ ns->shm_tot = 0;
+ ipc_init_ids(ids, 1);
+}
-static int shm_tot; /* total number of shared memory pages */
+static void do_shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *shp)
+{
+ 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
+int shm_init_ns(struct ipc_namespace *ns)
+{
+ struct ipc_ids *ids;
+
+ ids = kmalloc(sizeof(struct ipc_ids), GFP_KERNEL);
+ if (ids == NULL)
+ return -ENOMEM;
+
+ __shm_init_ns(ns, ids);
+ return 0;
+}
+
+void shm_exit_ns(struct ipc_namespace *ns)
+{
+ int i;
+ struct shmid_kernel *shp;
+
+ mutex_lock(&shm_ids(ns).mutex);
+ for (i = 0; i <= shm_ids(ns).max_id; i++) {
+ shp = shm_lock(ns, i);
+ if (shp == NULL)
+ continue;
+
+ do_shm_rmid(ns, shp);
+ }
+ mutex_unlock(&shm_ids(ns).mutex);
+
+ kfree(ns->ids[IPC_SHM_IDS]);
+ ns->ids[IPC_SHM_IDS] = NULL;
+}
+#endif
void __init shm_init (void)
{
- ipc_init_ids(&shm_ids, 1);
+ __shm_init_ns(&init_ipc_ns, &init_shm_ids);
ipc_init_proc_interface("sysvipc/shm",
" key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime\n",
- &shm_ids,
- sysvipc_shm_proc_show);
+ IPC_SHM_IDS, sysvipc_shm_proc_show);
}
-static inline int shm_checkid(struct shmid_kernel *s, int id)
+static inline int shm_checkid(struct ipc_namespace *ns,
+ struct shmid_kernel *s, int id)
{
- if (ipc_checkid(&shm_ids,&s->shm_perm,id))
+ if (ipc_checkid(&shm_ids(ns), &s->shm_perm, id))
return -EIDRM;
return 0;
}
-static inline struct shmid_kernel *shm_rmid(int id)
+static inline struct shmid_kernel *shm_rmid(struct ipc_namespace *ns, int id)
{
- return (struct shmid_kernel *)ipc_rmid(&shm_ids,id);
+ return (struct shmid_kernel *)ipc_rmid(&shm_ids(ns), id);
}
-static inline int shm_addid(struct shmid_kernel *shp)
+static inline int shm_addid(struct ipc_namespace *ns, struct shmid_kernel *shp)
{
- return ipc_addid(&shm_ids, &shp->shm_perm, shm_ctlmni);
+ return ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
}
-static inline void shm_inc (int id) {
+static inline void shm_inc(struct ipc_namespace *ns, int id)
+{
struct shmid_kernel *shp;
- shp = shm_lock(id);
+ shp = shm_lock(ns, id);
BUG_ON(!shp);
shp->shm_atim = get_seconds();
shp->shm_lprid = current->tgid;
@@ -101,10 +162,13 @@ static inline void shm_inc (int id) {
shm_unlock(shp);
}
+#define shm_file_ns(file) (*((struct ipc_namespace **)&(file)->private_data))
+
/* This is called by fork, once for every shm attach. */
-static void shm_open (struct vm_area_struct *shmd)
+static void shm_open(struct vm_area_struct *shmd)
{
- shm_inc (shmd->vm_file->f_dentry->d_inode->i_ino);
+ shm_inc(shm_file_ns(shmd->vm_file),
+ shmd->vm_file->f_dentry->d_inode->i_ino);
}
/*
@@ -115,10 +179,10 @@ static void shm_open (struct vm_area_str
* It has to be called with shp and shm_ids.mutex locked,
* but returns with shp unlocked and freed.
*/
-static void shm_destroy (struct shmid_kernel *shp)
+static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
{
- shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
- shm_rmid (shp->id);
+ ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ shm_rmid(ns, shp->id);
shm_unlock(shp);
if (!is_file_hugepages(shp->shm_file))
shmem_lock(shp->shm_file, 0, shp->mlock_user);
@@ -141,20 +205,23 @@ static void shm_close (struct vm_area_st
struct file * file = shmd->vm_file;
int id = file->f_dentry->d_inode->i_ino;
struct shmid_kernel *shp;
+ struct ipc_namespace *ns;
- mutex_lock(&shm_ids.mutex);
+ ns = shm_file_ns(file);
+
+ mutex_lock(&shm_ids(ns).mutex);
/* remove from the list of attaches of the shm segment */
- shp = shm_lock(id);
+ shp = shm_lock(ns, id);
BUG_ON(!shp);
shp->shm_lprid = current->tgid;
shp->shm_dtim = get_seconds();
shp->shm_nattch--;
if(shp->shm_nattch == 0 &&
shp->shm_perm.mode & SHM_DEST)
- shm_destroy (shp);
+ shm_destroy(ns, shp);
else
shm_unlock(shp);
- mutex_unlock(&shm_ids.mutex);
+ mutex_unlock(&shm_ids(ns).mutex);
}
static int shm_mmap(struct file * file, struct vm_area_struct * vma)
@@ -166,14 +233,25 @@ static int shm_mmap(struct file * file,
vma->vm_ops = &shm_vm_ops;
if (!(vma->vm_flags & VM_WRITE))
vma->vm_flags &= ~VM_MAYWRITE;
- shm_inc(file->f_dentry->d_inode->i_ino);
+ shm_inc(shm_file_ns(file), file->f_dentry->d_inode->i_ino);
}
return ret;
}
+static int shm_release(struct inode *ino, struct file *file)
+{
+ struct ipc_namespace *ns;
+
+ ns = shm_file_ns(file);
+ put_ipc_ns(ns);
+ shm_file_ns(file) = NULL;
+ return 0;
+}
+
static struct file_operations shm_file_operations = {
- .mmap = shm_mmap,
+ .mmap = shm_mmap,
+ .release = shm_release,
#ifndef CONFIG_MMU
.get_unmapped_area = shmem_get_unmapped_area,
#endif
@@ -189,7 +267,7 @@ static struct vm_operations_struct shm_v
#endif
};
-static int newseg (key_t key, int shmflg, size_t size)
+static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size)
{
int error;
struct shmid_kernel *shp;
@@ -198,10 +276,10 @@ static int newseg (key_t key, int shmflg
char name[13];
int id;
- if (size < SHMMIN || size > shm_ctlmax)
+ if (size < SHMMIN || size > ns->shm_ctlmax)
return -EINVAL;
- if (shm_tot + numpages >= shm_ctlall)
+ if (ns->shm_tot + numpages >= ns->shm_ctlall)
return -ENOSPC;
shp = ipc_rcu_alloc(sizeof(*shp));
@@ -240,7 +318,7 @@ static int newseg (key_t key, int shmflg
goto no_file;
error = -ENOSPC;
- id = shm_addid(shp);
+ id = shm_addid(ns, shp);
if(id == -1)
goto no_id;
@@ -250,15 +328,17 @@ static int newseg (key_t key, int shmflg
shp->shm_ctim = get_seconds();
shp->shm_segsz = size;
shp->shm_nattch = 0;
- shp->id = shm_buildid(id,shp->shm_perm.seq);
+ shp->id = shm_buildid(ns, id, shp->shm_perm.seq);
shp->shm_file = file;
file->f_dentry->d_inode->i_ino = shp->id;
+ shm_file_ns(file) = get_ipc_ns(ns);
+
/* Hugetlb ops would have already been assigned. */
if (!(shmflg & SHM_HUGETLB))
file->f_op = &shm_file_operations;
- shm_tot += numpages;
+ ns->shm_tot += numpages;
shm_unlock(shp);
return shp->id;
@@ -274,33 +354,36 @@ asmlinkage long sys_shmget (key_t key, s
{
struct shmid_kernel *shp;
int err, id = 0;
+ struct ipc_namespace *ns;
- mutex_lock(&shm_ids.mutex);
+ ns = current->nsproxy->ipc_ns;
+
+ mutex_lock(&shm_ids(ns).mutex);
if (key == IPC_PRIVATE) {
- err = newseg(key, shmflg, size);
- } else if ((id = ipc_findkey(&shm_ids, key)) == -1) {
+ err = newseg(ns, key, shmflg, size);
+ } else if ((id = ipc_findkey(&shm_ids(ns), key)) == -1) {
if (!(shmflg & IPC_CREAT))
err = -ENOENT;
else
- err = newseg(key, shmflg, size);
+ err = newseg(ns, key, shmflg, size);
} else if ((shmflg & IPC_CREAT) && (shmflg & IPC_EXCL)) {
err = -EEXIST;
} else {
- shp = shm_lock(id);
+ shp = shm_lock(ns, id);
BUG_ON(shp==NULL);
if (shp->shm_segsz < size)
err = -EINVAL;
else if (ipcperms(&shp->shm_perm, shmflg))
err = -EACCES;
else {
- int shmid = shm_buildid(id, shp->shm_perm.seq);
+ int shmid = shm
...
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