procfs: new helper - PDE_DATA(inode)
The only part of proc_dir_entry the code outside of fs/proc
really cares about is PDE(inode)->data. Provide a helper
for that; static inline for now, eventually will be moved
to fs/proc, along with the knowledge of struct proc_dir_entry
layout.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/powerpc/kernel/proc_powerpc.c b/arch/powerpc/kernel/proc_powerpc.c
index f19d0bd..41d8ee9 100644
--- a/arch/powerpc/kernel/proc_powerpc.c
+++ b/arch/powerpc/kernel/proc_powerpc.c
@@ -32,8 +32,6 @@
static loff_t page_map_seek( struct file *file, loff_t off, int whence)
{
loff_t new;
- struct proc_dir_entry *dp = PDE(file_inode(file));
-
switch(whence) {
case 0:
new = off;
@@ -42,12 +40,12 @@
new = file->f_pos + off;
break;
case 2:
- new = dp->size + off;
+ new = PAGE_SIZE + off;
break;
default:
return -EINVAL;
}
- if ( new < 0 || new > dp->size )
+ if ( new < 0 || new > PAGE_SIZE )
return -EINVAL;
return (file->f_pos = new);
}
@@ -55,19 +53,18 @@
static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes,
loff_t *ppos)
{
- struct proc_dir_entry *dp = PDE(file_inode(file));
- return simple_read_from_buffer(buf, nbytes, ppos, dp->data, dp->size);
+ return simple_read_from_buffer(buf, nbytes, ppos,
+ PDE_DATA(file_inode(file)), PAGE_SIZE);
}
static int page_map_mmap( struct file *file, struct vm_area_struct *vma )
{
- struct proc_dir_entry *dp = PDE(file_inode(file));
-
- if ((vma->vm_end - vma->vm_start) > dp->size)
+ if ((vma->vm_end - vma->vm_start) > PAGE_SIZE)
return -EINVAL;
- remap_pfn_range(vma, vma->vm_start, __pa(dp->data) >> PAGE_SHIFT,
- dp->size, vma->vm_page_prot);
+ remap_pfn_range(vma, vma->vm_start,
+ __pa(PDE_DATA(file_inode(file))) >> PAGE_SHIFT,
+ PAGE_SIZE, vma->vm_page_prot);
return 0;
}