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authorPaul Mundt <lethal@linux-sh.org>2007-05-08 00:37:41 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 11:15:27 -0700
commit5e841b88d23d0ea0a6ee4e76c489899d4d23ce25 (patch)
tree7268b4bbb85aa7b1c72f54f7f8cd309b34cfecce /drivers
parent7bf1ea33ad70cf49638092367d52859fbbc44fee (diff)
fb: fsync() method for deferred I/O flush.
There are cases when we do not want to wait on the delay for automatically updating the "real" framebuffer, this implements a simple ->fsync() hook for explicitly flushing the deferred I/O work. The ->page_mkwrite() handler will rearm the work queue normally. (akpm: nuke unneeded ifdefs, forward-delcare struct dentry) Signed-off-by: Paul Mundt <lethal@linux-sh.org> Cc: Jaya Kumar <jayakumar.lkml@gmail.com> Acked-by: Antonino Daplas <adaplas@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/video/fb_defio.c12
-rw-r--r--drivers/video/fbmem.c3
2 files changed, 15 insertions, 0 deletions
diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c
index 65f4e6ee7f9..f963f5f59b7 100644
--- a/drivers/video/fb_defio.c
+++ b/drivers/video/fb_defio.c
@@ -47,6 +47,18 @@ static struct page* fb_deferred_io_nopage(struct vm_area_struct *vma,
return page;
}
+int fb_deferred_io_fsync(struct file *file, struct dentry *dentry, int datasync)
+{
+ struct fb_info *info = file->private_data;
+
+ /* Kill off the delayed work */
+ cancel_rearming_delayed_work(&info->deferred_work);
+
+ /* Run it immediately */
+ return schedule_delayed_work(&info->deferred_work, 0);
+}
+EXPORT_SYMBOL_GPL(fb_deferred_io_fsync);
+
/* vm_ops->page_mkwrite handler */
static int fb_deferred_io_mkwrite(struct vm_area_struct *vma,
struct page *page)
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 28225265159..44cf0e4f52e 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1266,6 +1266,9 @@ static const struct file_operations fb_fops = {
#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
.get_unmapped_area = get_fb_unmapped_area,
#endif
+#ifdef CONFIG_FB_DEFERRED_IO
+ .fsync = fb_deferred_io_fsync,
+#endif
};
struct class *fb_class;