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fbdefio: add set_page_dirty handler to deferred IO FB

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Fixes kernel BUG at lib/radix-tree.c:473.

Previously the handler was incidentally provided by tmpfs but this was
removed with:

  commit 14fcc23fdc
  Author: Hugh Dickins <[email protected]>
  Date:   Mon Jul 28 15:46:19 2008 -0700

    tmpfs: fix kernel BUG in shmem_delete_inode

relying on this behaviour was incorrect in any case and the BUG also
appeared when the device node was on an ext3 filesystem.

v2: override a_ops at open() time rather than mmap() time to minimise
races per AKPM's concerns.

Signed-off-by: Ian Campbell <[email protected]>
Cc: Jaya Kumar <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Jeremy Fitzhardinge <[email protected]>
Cc: Kel Modderman <[email protected]>
Cc: Markus Armbruster <[email protected]>
Cc: Krzysztof Helt <[email protected]>
Cc: <[email protected]> [14fcc23fd is in 2.6.25.14 and 2.6.26.1]
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ian Campbell 2008-08-20 14:09:23 -07:00 • committed by Linus Torvalds
commit d847471d06
3 changed files with 26 additions and 0 deletions
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19
drivers/video/fb_defio.c
View file

@ -114,6 +114,17 @@ static struct vm_operations_struct fb_deferred_io_vm_ops = {
.page_mkwrite = fb_deferred_io_mkwrite,
};
static int fb_deferred_io_set_page_dirty(struct page *page)
{
if (!PageDirty(page))
SetPageDirty(page);
return 0;
}
static const struct address_space_operations fb_deferred_io_aops = {
.set_page_dirty = fb_deferred_io_set_page_dirty,
};
static int fb_deferred_io_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
vma->vm_ops = &fb_deferred_io_vm_ops;
@ -163,6 +174,14 @@ void fb_deferred_io_init(struct fb_info *info)
}
EXPORT_SYMBOL_GPL(fb_deferred_io_init);
void fb_deferred_io_open(struct fb_info *info,
struct inode *inode,
struct file *file)
{
file->f_mapping->a_ops = &fb_deferred_io_aops;
}
EXPORT_SYMBOL_GPL(fb_deferred_io_open);
void fb_deferred_io_cleanup(struct fb_info *info)
{
void *screen_base = (void __force *) info->screen_base;

4
drivers/video/fbmem.c
View file

@ -1344,6 +1344,10 @@ fb_open(struct inode *inode, struct file *file)
if (res)
module_put(info->fbops->owner);
}
#ifdef CONFIG_FB_DEFERRED_IO
if (info->fbdefio)
fb_deferred_io_open(info, inode, file);
#endif
out:
unlock_kernel();
return res;