* [PATCH] xfs: in _attrlist_by_handle, copy the cursor back to userspace
@ 2016-08-02 3:56 Darrick J. Wong
2016-08-02 12:25 ` Christoph Hellwig
0 siblings, 1 reply; 6+ messages in thread
From: Darrick J. Wong @ 2016-08-02 3:56 UTC (permalink / raw)
To: david; +Cc: xfs
When we're iterating inode xattrs by handle, we have to copy the
cursor back to userspace so that a subsequent invocation actually
retrieves subsequent contents.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/xfs/xfs_ioctl.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 2ef22db..30e69f5 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -390,6 +390,7 @@ xfs_attrlist_by_handle(
{
int error = -ENOMEM;
attrlist_cursor_kern_t *cursor;
+ struct xfs_fsop_attrlist_handlereq __user *p = arg;
xfs_fsop_attrlist_handlereq_t al_hreq;
struct dentry *dentry;
char *kbuf;
@@ -422,6 +423,11 @@ xfs_attrlist_by_handle(
if (error)
goto out_kfree;
+ if (copy_to_user(&p->pos, cursor, sizeof(attrlist_cursor_kern_t))) {
+ error = -EFAULT;
+ goto out_kfree;
+ }
+
if (copy_to_user(al_hreq.buffer, kbuf, al_hreq.buflen))
error = -EFAULT;
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^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] xfs: in _attrlist_by_handle, copy the cursor back to userspace
2016-08-02 3:56 [PATCH] xfs: in _attrlist_by_handle, copy the cursor back to userspace Darrick J. Wong
@ 2016-08-02 12:25 ` Christoph Hellwig
2016-08-02 15:40 ` Darrick J. Wong
0 siblings, 1 reply; 6+ messages in thread
From: Christoph Hellwig @ 2016-08-02 12:25 UTC (permalink / raw)
To: Darrick J. Wong; +Cc: xfs
On Mon, Aug 01, 2016 at 08:56:51PM -0700, Darrick J. Wong wrote:
> When we're iterating inode xattrs by handle, we have to copy the
> cursor back to userspace so that a subsequent invocation actually
> retrieves subsequent contents.
Testcase?
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] xfs: in _attrlist_by_handle, copy the cursor back to userspace
2016-08-02 12:25 ` Christoph Hellwig
@ 2016-08-02 15:40 ` Darrick J. Wong
2016-08-02 21:41 ` Dave Chinner
2016-08-02 23:57 ` Darrick J. Wong
0 siblings, 2 replies; 6+ messages in thread
From: Darrick J. Wong @ 2016-08-02 15:40 UTC (permalink / raw)
To: Christoph Hellwig; +Cc: xfs
On Tue, Aug 02, 2016 at 05:25:17AM -0700, Christoph Hellwig wrote:
> On Mon, Aug 01, 2016 at 08:56:51PM -0700, Darrick J. Wong wrote:
> > When we're iterating inode xattrs by handle, we have to copy the
> > cursor back to userspace so that a subsequent invocation actually
> > retrieves subsequent contents.
>
> Testcase?
Found it while continuing development of xfs_scrub. I'll send along the
xfstest patch when I've finished polishing it. (It was harder than usual since
xfs_io doesn't /use/ the attr-by-handle interface... nothing does.)
--D
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] xfs: in _attrlist_by_handle, copy the cursor back to userspace
2016-08-02 15:40 ` Darrick J. Wong
@ 2016-08-02 21:41 ` Dave Chinner
2016-08-02 22:47 ` Mark Tinguely
2016-08-02 23:57 ` Darrick J. Wong
1 sibling, 1 reply; 6+ messages in thread
From: Dave Chinner @ 2016-08-02 21:41 UTC (permalink / raw)
To: Darrick J. Wong; +Cc: Christoph Hellwig, xfs
On Tue, Aug 02, 2016 at 08:40:35AM -0700, Darrick J. Wong wrote:
> On Tue, Aug 02, 2016 at 05:25:17AM -0700, Christoph Hellwig wrote:
> > On Mon, Aug 01, 2016 at 08:56:51PM -0700, Darrick J. Wong wrote:
> > > When we're iterating inode xattrs by handle, we have to copy the
> > > cursor back to userspace so that a subsequent invocation actually
> > > retrieves subsequent contents.
> >
> > Testcase?
>
> Found it while continuing development of xfs_scrub. I'll send along the
> xfstest patch when I've finished polishing it. (It was harder than usual since
> xfs_io doesn't /use/ the attr-by-handle interface... nothing does.)
It was (and probably still is) used by SGI's HSM. I thought there
was some coverage of the interface in the dmapi part of the xfstests
suite, but perhaps it's only tested by SGI's internal hsm test
suite...
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] xfs: in _attrlist_by_handle, copy the cursor back to userspace
2016-08-02 21:41 ` Dave Chinner
@ 2016-08-02 22:47 ` Mark Tinguely
0 siblings, 0 replies; 6+ messages in thread
From: Mark Tinguely @ 2016-08-02 22:47 UTC (permalink / raw)
To: xfs
On 08/02/16 16:41, Dave Chinner wrote:
> On Tue, Aug 02, 2016 at 08:40:35AM -0700, Darrick J. Wong wrote:
>> On Tue, Aug 02, 2016 at 05:25:17AM -0700, Christoph Hellwig wrote:
>>> On Mon, Aug 01, 2016 at 08:56:51PM -0700, Darrick J. Wong wrote:
>>>> When we're iterating inode xattrs by handle, we have to copy the
>>>> cursor back to userspace so that a subsequent invocation actually
>>>> retrieves subsequent contents.
>>> Testcase?
>> Found it while continuing development of xfs_scrub. I'll send along the
>> xfstest patch when I've finished polishing it. (It was harder than usual since
>> xfs_io doesn't /use/ the attr-by-handle interface... nothing does.)
> It was (and probably still is) used by SGI's HSM. I thought there
> was some coverage of the interface in the dmapi part of the xfstests
> suite, but perhaps it's only tested by SGI's internal hsm test
> suite...
>
> Cheers,
>
> Dave.
You may be thinking of the DMAPI specific extended attribute interface
and that is tested in xfstests. That function cannot cursor.
This change would be appropriate to xfsdump (dumping extended attributes
via jdm_attr_list()) than our HSM.
I don't see a SGI test for attr_list_by_handle() nor jdm_attr_list().
There is mention in the xfstests source file src/open_unlink.c but that
does not cursor.
--Mark Tinguely.
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] xfs: in _attrlist_by_handle, copy the cursor back to userspace
2016-08-02 15:40 ` Darrick J. Wong
2016-08-02 21:41 ` Dave Chinner
@ 2016-08-02 23:57 ` Darrick J. Wong
1 sibling, 0 replies; 6+ messages in thread
From: Darrick J. Wong @ 2016-08-02 23:57 UTC (permalink / raw)
To: Christoph Hellwig; +Cc: xfs
On Tue, Aug 02, 2016 at 08:40:35AM -0700, Darrick J. Wong wrote:
> On Tue, Aug 02, 2016 at 05:25:17AM -0700, Christoph Hellwig wrote:
> > On Mon, Aug 01, 2016 at 08:56:51PM -0700, Darrick J. Wong wrote:
> > > When we're iterating inode xattrs by handle, we have to copy the
> > > cursor back to userspace so that a subsequent invocation actually
> > > retrieves subsequent contents.
> >
> > Testcase?
>
> Found it while continuing development of xfs_scrub. I'll send along the
> xfstest patch when I've finished polishing it. (It was harder than usual since
> xfs_io doesn't /use/ the attr-by-handle interface... nothing does.)
Found some extra time while I run all of today's rmap changes through QA
to push to Dave, so I fixed (I hope) the remaining problems I had and
sent out a testcase.
--D
>
> --D
>
> _______________________________________________
> xfs mailing list
> xfs@oss.sgi.com
> http://oss.sgi.com/mailman/listinfo/xfs
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2016-08-02 3:56 [PATCH] xfs: in _attrlist_by_handle, copy the cursor back to userspace Darrick J. Wong
2016-08-02 12:25 ` Christoph Hellwig
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