On 16:46 Срд 20 Июн , Mingming Cao wrote:
> On Wed, 2007-06-20 at 12:15 +0400, Alex Tomas wrote:
> > Mingming Cao wrote:
> > > Hmm, PageMappedToDisk is probably not sufficient enough for pagesize!
> > > =blocksize. Is that the reason we need page->private to pass the
> > > request?
> >
> > PageMappedToDisk isn't enough in that case, definitely. bh is the way
> > to track state of each block (this is what i'm implementing now), but
> > I think current nobh version (per-page flags are used) is valuable.
> >
> > > That's good to know, thanks for the update. So probably above error case
> > > handling will be addressed in the new version?
> >
> > well, you actually can move that SetPagePrivate() few lines above
> > (Dmitriy already tested this).
>
> Like this?
Of course not, we may set page private bit only if
space was successfully reserved by ext4_wb_reserve_space_page().
So patch looks like this:
diff --git a/fs/ext4/writeback.c b/fs/ext4/writeback.c
index 3e669d6..84e5029 100644
--- a/fs/ext4/writeback.c
+++ b/fs/ext4/writeback.c
@@ -904,9 +904,6 @@ int ext4_wb_commit_write(struct file *file, struct page
*page,
wb_debug("commit page %lu (%u-%u) for inode %lu\n",
page->index, from, to, inode->i_ino);
- /* mark page private so that we get
- * called to invalidate/release page */
- SetPagePrivate(page);
if (!PageBooked(page) && !PageMappedToDisk(page)) {
/* ->prepare_write() observed that block for this
@@ -918,6 +915,9 @@ int ext4_wb_commit_write(struct file *file, struct page
*page,
if (err)
return err;
}
+ /* mark page private so that we get
+ * called to invalidate/release page */
+ SetPagePrivate(page);
/* ok. block for this page is allocated already or it has
* been reserved succesfully. so, user may use it */
--
1.5.2
>
> Index: linux-2.6.22-rc5/fs/ext4/writeback.c
> ===================================================================
> --- linux-2.6.22-rc5.orig/fs/ext4/writeback.c 2007-06-20 16:41:26.000000000
> -0700
> +++ linux-2.6.22-rc5/fs/ext4/writeback.c 2007-06-20 16:44:10.000000000
> -0700
> @@ -918,16 +918,16 @@ int ext4_wb_commit_write(struct file *fi
> wb_debug("commit page %lu (%u-%u) for inode %lu\n",
> page->index, from, to, inode->i_ino);
>
> - /* mark page private so that we get
> - * called to invalidate/release page */
> - SetPagePrivate(page);
> -
> if (!PageBooked(page) && !PageMappedToDisk(page)) {
> /* ->prepare_write() observed that block for this
> * page hasn't been allocated yet. there fore it
> * asked to reserve block for later allocation */
> BUG_ON(page->private == 0);
> page->private = 0;
> + /* mark page private so that we get
> + * called to invalidate/release page */
> + SetPagePrivate(page);
> +
> err = ext4_wb_reserve_space_page(page, 1);
> if (err)
> return err;
>
>
> -
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