[08/10] orangefs: use attach/detach_page_private
diff mbox series

Message ID 20200517214718.468-9-guoqing.jiang@cloud.ionos.com
State New
Headers show
Series
  • Introduce attach/detach_page_private to cleanup code
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Commit Message

Guoqing Jiang May 17, 2020, 9:47 p.m. UTC
Since the new pair function is introduced, we can call them to clean the
code in orangefs.

Cc: Mike Marshall <hubcap@omnibond.com>
Cc: Martin Brandenburg <martin@omnibond.com>
Cc: devel@lists.orangefs.org
Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
---
No change since RFC V3.

RFC V2 -> RFC V3
1. rename clear_page_private to detach_page_private.

RFC -> RFC V2
1. change the name of new functions to attach/clear_page_private.
2. avoid potential use-after-free as suggested by Dave Chinner.

 fs/orangefs/inode.c | 32 ++++++--------------------------
 1 file changed, 6 insertions(+), 26 deletions(-)

Comments

Mike Marshall May 26, 2020, 9:54 p.m. UTC | #1
I apologize for not mentioning that I ran this patch set
through orangefs xfstests at 5.7 rc5 with no problems
or regressions.

-Mike


On Sun, May 17, 2020 at 5:47 PM Guoqing Jiang
<guoqing.jiang@cloud.ionos.com> wrote:
>
> Since the new pair function is introduced, we can call them to clean the
> code in orangefs.
>
> Cc: Mike Marshall <hubcap@omnibond.com>
> Cc: Martin Brandenburg <martin@omnibond.com>
> Cc: devel@lists.orangefs.org
> Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
> ---
> No change since RFC V3.
>
> RFC V2 -> RFC V3
> 1. rename clear_page_private to detach_page_private.
>
> RFC -> RFC V2
> 1. change the name of new functions to attach/clear_page_private.
> 2. avoid potential use-after-free as suggested by Dave Chinner.
>
>  fs/orangefs/inode.c | 32 ++++++--------------------------
>  1 file changed, 6 insertions(+), 26 deletions(-)
>
> diff --git a/fs/orangefs/inode.c b/fs/orangefs/inode.c
> index 12ae630fbed7..48f0547d4850 100644
> --- a/fs/orangefs/inode.c
> +++ b/fs/orangefs/inode.c
> @@ -62,12 +62,7 @@ static int orangefs_writepage_locked(struct page *page,
>         } else {
>                 ret = 0;
>         }
> -       if (wr) {
> -               kfree(wr);
> -               set_page_private(page, 0);
> -               ClearPagePrivate(page);
> -               put_page(page);
> -       }
> +       kfree(detach_page_private(page));
>         return ret;
>  }
>
> @@ -409,9 +404,7 @@ static int orangefs_write_begin(struct file *file,
>         wr->len = len;
>         wr->uid = current_fsuid();
>         wr->gid = current_fsgid();
> -       SetPagePrivate(page);
> -       set_page_private(page, (unsigned long)wr);
> -       get_page(page);
> +       attach_page_private(page, wr);
>  okay:
>         return 0;
>  }
> @@ -459,18 +452,12 @@ static void orangefs_invalidatepage(struct page *page,
>         wr = (struct orangefs_write_range *)page_private(page);
>
>         if (offset == 0 && length == PAGE_SIZE) {
> -               kfree((struct orangefs_write_range *)page_private(page));
> -               set_page_private(page, 0);
> -               ClearPagePrivate(page);
> -               put_page(page);
> +               kfree(detach_page_private(page));
>                 return;
>         /* write range entirely within invalidate range (or equal) */
>         } else if (page_offset(page) + offset <= wr->pos &&
>             wr->pos + wr->len <= page_offset(page) + offset + length) {
> -               kfree((struct orangefs_write_range *)page_private(page));
> -               set_page_private(page, 0);
> -               ClearPagePrivate(page);
> -               put_page(page);
> +               kfree(detach_page_private(page));
>                 /* XXX is this right? only caller in fs */
>                 cancel_dirty_page(page);
>                 return;
> @@ -535,12 +522,7 @@ static int orangefs_releasepage(struct page *page, gfp_t foo)
>
>  static void orangefs_freepage(struct page *page)
>  {
> -       if (PagePrivate(page)) {
> -               kfree((struct orangefs_write_range *)page_private(page));
> -               set_page_private(page, 0);
> -               ClearPagePrivate(page);
> -               put_page(page);
> -       }
> +       kfree(detach_page_private(page));
>  }
>
>  static int orangefs_launder_page(struct page *page)
> @@ -740,9 +722,7 @@ vm_fault_t orangefs_page_mkwrite(struct vm_fault *vmf)
>         wr->len = PAGE_SIZE;
>         wr->uid = current_fsuid();
>         wr->gid = current_fsgid();
> -       SetPagePrivate(page);
> -       set_page_private(page, (unsigned long)wr);
> -       get_page(page);
> +       attach_page_private(page, wr);
>  okay:
>
>         file_update_time(vmf->vma->vm_file);
> --
> 2.17.1
>
Guoqing Jiang May 28, 2020, 8:39 a.m. UTC | #2
On 5/26/20 11:54 PM, Mike Marshall wrote:
> I apologize for not mentioning that I ran this patch set
> through orangefs xfstests at 5.7 rc5 with no problems
> or regressions.

Glad to hear that, thanks for your effort.

Thanks,
Guoqing

Patch
diff mbox series

diff --git a/fs/orangefs/inode.c b/fs/orangefs/inode.c
index 12ae630fbed7..48f0547d4850 100644
--- a/fs/orangefs/inode.c
+++ b/fs/orangefs/inode.c
@@ -62,12 +62,7 @@  static int orangefs_writepage_locked(struct page *page,
 	} else {
 		ret = 0;
 	}
-	if (wr) {
-		kfree(wr);
-		set_page_private(page, 0);
-		ClearPagePrivate(page);
-		put_page(page);
-	}
+	kfree(detach_page_private(page));
 	return ret;
 }
 
@@ -409,9 +404,7 @@  static int orangefs_write_begin(struct file *file,
 	wr->len = len;
 	wr->uid = current_fsuid();
 	wr->gid = current_fsgid();
-	SetPagePrivate(page);
-	set_page_private(page, (unsigned long)wr);
-	get_page(page);
+	attach_page_private(page, wr);
 okay:
 	return 0;
 }
@@ -459,18 +452,12 @@  static void orangefs_invalidatepage(struct page *page,
 	wr = (struct orangefs_write_range *)page_private(page);
 
 	if (offset == 0 && length == PAGE_SIZE) {
-		kfree((struct orangefs_write_range *)page_private(page));
-		set_page_private(page, 0);
-		ClearPagePrivate(page);
-		put_page(page);
+		kfree(detach_page_private(page));
 		return;
 	/* write range entirely within invalidate range (or equal) */
 	} else if (page_offset(page) + offset <= wr->pos &&
 	    wr->pos + wr->len <= page_offset(page) + offset + length) {
-		kfree((struct orangefs_write_range *)page_private(page));
-		set_page_private(page, 0);
-		ClearPagePrivate(page);
-		put_page(page);
+		kfree(detach_page_private(page));
 		/* XXX is this right? only caller in fs */
 		cancel_dirty_page(page);
 		return;
@@ -535,12 +522,7 @@  static int orangefs_releasepage(struct page *page, gfp_t foo)
 
 static void orangefs_freepage(struct page *page)
 {
-	if (PagePrivate(page)) {
-		kfree((struct orangefs_write_range *)page_private(page));
-		set_page_private(page, 0);
-		ClearPagePrivate(page);
-		put_page(page);
-	}
+	kfree(detach_page_private(page));
 }
 
 static int orangefs_launder_page(struct page *page)
@@ -740,9 +722,7 @@  vm_fault_t orangefs_page_mkwrite(struct vm_fault *vmf)
 	wr->len = PAGE_SIZE;
 	wr->uid = current_fsuid();
 	wr->gid = current_fsgid();
-	SetPagePrivate(page);
-	set_page_private(page, (unsigned long)wr);
-	get_page(page);
+	attach_page_private(page, wr);
 okay:
 
 	file_update_time(vmf->vma->vm_file);