[PATCH] fb: fsync() method for deferred I/O flush.
From: Paul Mundt <hidden>
Date: 2007-03-05 10:41:44
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. Signed-off-by: Paul Mundt <redacted> -- drivers/video/fb_defio.c | 12 ++++++++++++ drivers/video/fbmem.c | 3 +++ include/linux/fb.h | 2 ++ 3 files changed, 17 insertions(+)
diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c
index c3e57cc..8a66dc8 100644
--- a/drivers/video/fb_defio.c
+++ b/drivers/video/fb_defio.c@@ -52,6 +52,18 @@ static void fb_deferred_io_work(struct work_struct *work) mutex_unlock(&fbdefio->lock); } +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 */ 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 863126a..69bbbe2 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;
diff --git a/include/linux/fb.h b/include/linux/fb.h
index af217dd..3f62652 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h@@ -933,6 +933,8 @@ extern void fb_deferred_io_init(struct fb_info *info); extern void fb_deferred_io_cleanup(struct fb_info *info); extern int fb_deferred_io_mkwrite(struct vm_area_struct *vma, struct page *page); +extern int fb_deferred_io_fsync(struct file *file, struct dentry *dentry, + int datasync); #else #define fb_deferred_io_init(fb_info) do { } while (0) #define fb_deferred_io_cleanup(fb_info) do { } while (0) -------------------------------------------------------------------------
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