From 5e841b88d23d0ea0a6ee4e76c489899d4d23ce25 Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Tue, 8 May 2007 00:37:41 -0700 Subject: [PATCH] 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 Cc: Jaya Kumar Acked-by: Antonino Daplas Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/fb_defio.c | 12 ++++++++++++ drivers/video/fbmem.c | 3 +++ include/linux/fb.h | 6 ++++-- 3 files changed, 19 insertions(+), 2 deletions(-) diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c index 65f4e6ee7f94..f963f5f59b73 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 28225265159a..44cf0e4f52e9 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 8a8255b94b62..0de426026f4a 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -4,6 +4,8 @@ #include #include +struct dentry; + /* Definitions of frame buffers */ #define FB_MAJOR 29 @@ -927,11 +929,11 @@ static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, } } -#ifdef CONFIG_FB_DEFERRED_IO /* drivers/video/fb_defio.c */ extern void fb_deferred_io_init(struct fb_info *info); extern void fb_deferred_io_cleanup(struct fb_info *info); -#endif +extern int fb_deferred_io_fsync(struct file *file, struct dentry *dentry, + int datasync); /* drivers/video/fbsysfs.c */ extern struct fb_info *framebuffer_alloc(size_t size, struct device *dev); -- 2.20.1