X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=ipc%2Futil.c;h=115e9aac13668762db8d45213778deafa5173f89;hb=47e627bc8c9a;hp=a9b7a227b8d4c7bde79998048206b96fef1f57ed;hpb=cece901481bafbf14de8cbd3a89ae869ea881055;p=pandora-kernel.git

diff --git a/ipc/util.c b/ipc/util.c
index a9b7a227b8d4..115e9aac1366 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -150,7 +150,7 @@ void free_ipc_ns(struct kref *kref)
  *	ipc_init	-	initialise IPC subsystem
  *
  *	The various system5 IPC resources (semaphores, messages and shared
- *	memory are initialised
+ *	memory) are initialised
  */
  
 static int __init ipc_init(void)
@@ -207,8 +207,7 @@ void __ipc_init ipc_init_ids(struct ipc_ids* ids, int size)
 #ifdef CONFIG_PROC_FS
 static struct file_operations sysvipc_proc_fops;
 /**
- *	ipc_init_proc_interface	-  Create a proc interface for sysipc types
- *				   using a seq_file interface.
+ *	ipc_init_proc_interface	-  Create a proc interface for sysipc types using a seq_file interface.
  *	@path: Path in procfs
  *	@header: Banner to be printed at the beginning of the file.
  *	@ids: ipc id table to iterate.
@@ -417,7 +416,7 @@ void* ipc_alloc(int size)
  *	@ptr: pointer returned by ipc_alloc
  *	@size: size of block
  *
- *	Free a block created with ipc_alloc. The caller must know the size
+ *	Free a block created with ipc_alloc(). The caller must know the size
  *	used in the allocation call.
  */
 
@@ -524,7 +523,7 @@ static void ipc_do_vfree(struct work_struct *work)
  * @head: RCU callback structure for queued work
  * 
  * Since RCU callback function is called in bh,
- * we need to defer the vfree to schedule_work
+ * we need to defer the vfree to schedule_work().
  */
 static void ipc_schedule_free(struct rcu_head *head)
 {
@@ -541,7 +540,7 @@ static void ipc_schedule_free(struct rcu_head *head)
  * ipc_immediate_free - free ipc + rcu space
  * @head: RCU callback structure that contains pointer to be freed
  *
- * Free from the RCU callback context
+ * Free from the RCU callback context.
  */
 static void ipc_immediate_free(struct rcu_head *head)
 {
@@ -603,8 +602,8 @@ int ipcperms (struct kern_ipc_perm *ipcp, short flag)
  *	@in: kernel permissions
  *	@out: new style IPC permissions
  *
- *	Turn the kernel object 'in' into a set of permissions descriptions
- *	for returning to userspace (out).
+ *	Turn the kernel object @in into a set of permissions descriptions
+ *	for returning to userspace (@out).
  */
  
 
@@ -624,8 +623,8 @@ void kernel_to_ipc64_perm (struct kern_ipc_perm *in, struct ipc64_perm *out)
  *	@in: new style IPC permissions
  *	@out: old style IPC permissions
  *
- *	Turn the new style permissions object in into a compatibility
- *	object and store it into the 'out' pointer.
+ *	Turn the new style permissions object @in into a compatibility
+ *	object and store it into the @out pointer.
  */
  
 void ipc64_perm_to_ipc_perm (struct ipc64_perm *in, struct ipc_perm *out)
@@ -722,7 +721,7 @@ int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid)
  *	@cmd: pointer to command
  *
  *	Return IPC_64 for new style IPC and IPC_OLD for old style IPC. 
- *	The cmd value is turned from an encoding command and version into
+ *	The @cmd value is turned from an encoding command and version into
  *	just the command code.
  */
  
@@ -739,14 +738,20 @@ int ipc_parse_version (int *cmd)
 #endif /* __ARCH_WANT_IPC_PARSE_VERSION */
 
 #ifdef CONFIG_PROC_FS
+struct ipc_proc_iter {
+	struct ipc_namespace *ns;
+	struct ipc_proc_iface *iface;
+};
+
 static void *sysvipc_proc_next(struct seq_file *s, void *it, loff_t *pos)
 {
-	struct ipc_proc_iface *iface = s->private;
+	struct ipc_proc_iter *iter = s->private;
+	struct ipc_proc_iface *iface = iter->iface;
 	struct kern_ipc_perm *ipc = it;
 	loff_t p;
 	struct ipc_ids *ids;
 
-	ids = current->nsproxy->ipc_ns->ids[iface->ids];
+	ids = iter->ns->ids[iface->ids];
 
 	/* If we had an ipc id locked before, unlock it */
 	if (ipc && ipc != SEQ_START_TOKEN)
@@ -773,12 +778,13 @@ static void *sysvipc_proc_next(struct seq_file *s, void *it, loff_t *pos)
  */
 static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos)
 {
-	struct ipc_proc_iface *iface = s->private;
+	struct ipc_proc_iter *iter = s->private;
+	struct ipc_proc_iface *iface = iter->iface;
 	struct kern_ipc_perm *ipc;
 	loff_t p;
 	struct ipc_ids *ids;
 
-	ids = current->nsproxy->ipc_ns->ids[iface->ids];
+	ids = iter->ns->ids[iface->ids];
 
 	/*
 	 * Take the lock - this will be released by the corresponding
@@ -807,21 +813,23 @@ static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos)
 static void sysvipc_proc_stop(struct seq_file *s, void *it)
 {
 	struct kern_ipc_perm *ipc = it;
-	struct ipc_proc_iface *iface = s->private;
+	struct ipc_proc_iter *iter = s->private;
+	struct ipc_proc_iface *iface = iter->iface;
 	struct ipc_ids *ids;
 
 	/* If we had a locked segment, release it */
 	if (ipc && ipc != SEQ_START_TOKEN)
 		ipc_unlock(ipc);
 
-	ids = current->nsproxy->ipc_ns->ids[iface->ids];
+	ids = iter->ns->ids[iface->ids];
 	/* Release the lock we took in start() */
 	mutex_unlock(&ids->mutex);
 }
 
 static int sysvipc_proc_show(struct seq_file *s, void *it)
 {
-	struct ipc_proc_iface *iface = s->private;
+	struct ipc_proc_iter *iter = s->private;
+	struct ipc_proc_iface *iface = iter->iface;
 
 	if (it == SEQ_START_TOKEN)
 		return seq_puts(s, iface->header);
@@ -836,22 +844,45 @@ static struct seq_operations sysvipc_proc_seqops = {
 	.show  = sysvipc_proc_show,
 };
 
-static int sysvipc_proc_open(struct inode *inode, struct file *file) {
+static int sysvipc_proc_open(struct inode *inode, struct file *file)
+{
 	int ret;
 	struct seq_file *seq;
+	struct ipc_proc_iter *iter;
+
+	ret = -ENOMEM;
+	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+	if (!iter)
+		goto out;
 
 	ret = seq_open(file, &sysvipc_proc_seqops);
-	if (!ret) {
-		seq = file->private_data;
-		seq->private = PDE(inode)->data;
-	}
+	if (ret)
+		goto out_kfree;
+
+	seq = file->private_data;
+	seq->private = iter;
+
+	iter->iface = PDE(inode)->data;
+	iter->ns    = get_ipc_ns(current->nsproxy->ipc_ns);
+out:
 	return ret;
+out_kfree:
+	kfree(iter);
+	goto out;
+}
+
+static int sysvipc_proc_release(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq = file->private_data;
+	struct ipc_proc_iter *iter = seq->private;
+	put_ipc_ns(iter->ns);
+	return seq_release_private(inode, file);
 }
 
 static struct file_operations sysvipc_proc_fops = {
 	.open    = sysvipc_proc_open,
 	.read    = seq_read,
 	.llseek  = seq_lseek,
-	.release = seq_release,
+	.release = sysvipc_proc_release,
 };
 #endif /* CONFIG_PROC_FS */