vm audit: add VM_DONTEXPAND to mmap for drivers that need it

[sfrench/cifs-2.6.git] / kernel / relay.c

diff --git a/kernel/relay.c b/kernel/relay.c
index a615a8f513fc890eaa1a11a34ae5e08c78895bba..7c0373322f18892eea75e3773714554f59f46c1e 100644 (file)
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -1,7 +1,7 @@
 /*
  * Public API and common code for kernel->userspace relay file support.
  *
- * See Documentation/filesystems/relayfs.txt for an overview of relayfs.
+ * See Documentation/filesystems/relay.txt for an overview.
  *
  * Copyright (C) 2002-2005 - Tom Zanussi (zanussi@us.ibm.com), IBM Corp
  * Copyright (C) 1999-2005 - Karim Yaghmour (karim@opersys.com)
@@ -80,7 +80,7 @@ static struct vm_operations_struct relay_file_mmap_ops = {
  *
  *     Caller should already have grabbed mmap_sem.
  */
-int relay_mmap_buf(struct rchan_buf *buf, struct vm_area_struct *vma)
+static int relay_mmap_buf(struct rchan_buf *buf, struct vm_area_struct *vma)
 {
        unsigned long length = vma->vm_end - vma->vm_start;
        struct file *filp = vma->vm_file;
@@ -92,6 +92,7 @@ int relay_mmap_buf(struct rchan_buf *buf, struct vm_area_struct *vma)
                return -EINVAL;
 
        vma->vm_ops = &relay_file_mmap_ops;
+       vma->vm_flags |= VM_DONTEXPAND;
        vma->vm_private_data = buf;
        buf->chan->cb->buf_mapped(buf, filp);
 
@@ -145,7 +146,7 @@ depopulate:
  *
  *     Returns channel buffer if successful, %NULL otherwise.
  */
-struct rchan_buf *relay_create_buf(struct rchan *chan)
+static struct rchan_buf *relay_create_buf(struct rchan *chan)
 {
        struct rchan_buf *buf = kzalloc(sizeof(struct rchan_buf), GFP_KERNEL);
        if (!buf)
@@ -175,7 +176,7 @@ free_buf:
  *
  *     Should only be called from kref_put().
  */
-void relay_destroy_channel(struct kref *kref)
+static void relay_destroy_channel(struct kref *kref)
 {
        struct rchan *chan = container_of(kref, struct rchan, kref);
        kfree(chan);
@@ -185,7 +186,7 @@ void relay_destroy_channel(struct kref *kref)
  *     relay_destroy_buf - destroy an rchan_buf struct and associated buffer
  *     @buf: the buffer struct
  */
-void relay_destroy_buf(struct rchan_buf *buf)
+static void relay_destroy_buf(struct rchan_buf *buf)
 {
        struct rchan *chan = buf->chan;
        unsigned int i;
@@ -210,7 +211,7 @@ void relay_destroy_buf(struct rchan_buf *buf)
  *     rchan_buf_struct and the channel buffer.  Should only be called from
  *     kref_put().
  */
-void relay_remove_buf(struct kref *kref)
+static void relay_remove_buf(struct kref *kref)
 {
        struct rchan_buf *buf = container_of(kref, struct rchan_buf, kref);
        buf->chan->cb->remove_buf_file(buf->dentry);
@@ -223,11 +224,10 @@ void relay_remove_buf(struct kref *kref)
  *
  *     Returns 1 if the buffer is empty, 0 otherwise.
  */
-int relay_buf_empty(struct rchan_buf *buf)
+static int relay_buf_empty(struct rchan_buf *buf)
 {
        return (buf->subbufs_produced - buf->subbufs_consumed) ? 0 : 1;
 }
-EXPORT_SYMBOL_GPL(relay_buf_empty);
 
 /**
  *     relay_buf_full - boolean, is the channel buffer full?
@@ -371,7 +371,7 @@ void relay_reset(struct rchan *chan)
        if (!chan)
                return;
 
-       if (chan->is_global && chan->buf[0]) {
+       if (chan->is_global && chan->buf[0]) {
                __relay_reset(chan->buf[0], 0);
                return;
        }
@@ -427,6 +427,7 @@ static struct rchan_buf *relay_open_buf(struct rchan *chan, unsigned int cpu)
 
 free_buf:
        relay_destroy_buf(buf);
+       buf = NULL;
 free_name:
        kfree(tmpname);
 end:
@@ -850,13 +851,13 @@ static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos)
                buf->subbufs_consumed = consumed;
                buf->bytes_consumed = 0;
        }
-       
+
        produced = (produced % n_subbufs) * subbuf_size + buf->offset;
        consumed = (consumed % n_subbufs) * subbuf_size + buf->bytes_consumed;
 
        if (consumed > produced)
                produced += n_subbufs * subbuf_size;
-       
+
        if (consumed == produced)
                return 0;