[PATCH] ceph: remove the incorrect caps check in _file_size()

[PATCH] ceph: remove the incorrect caps check in _file_size()

[xiubli]

From: Xiubo Li <xiubli@redhat.com>

When truncating the inode the MDS will acquire the xlock for the
ifile Locker, which will revoke the 'Frwsxl' caps from the clients.
But when the client just releases and flushes the 'Fw' caps to MDS,
for exmaple, and once the MDS receives the caps flushing msg it
just thought the revocation has finished. Then the MDS will continue
truncating the inode and then issued the truncate notification to
all the clients. While just before the clients receives the cap
flushing ack they receive the truncation notification, the clients
will detecte that the 'issued | dirty' is still holding the 'Fw'
caps.

Cc: stable@vger.kernel.org
URL: https://tracker.ceph.com/issues/56693
Signed-off-by: Xiubo Li <xiubli@redhat.com>
---
 fs/ceph/inode.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index ea6f966dacd5..8017b9e5864f 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -769,9 +769,7 @@ int ceph_fill_file_size(struct inode *inode, int issued,
 			ci->i_truncate_seq = truncate_seq;
 
 			/* the MDS should have revoked these caps */
-			WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
-					       CEPH_CAP_FILE_RD |
-					       CEPH_CAP_FILE_WR |
+			WARN_ON_ONCE(issued & (CEPH_CAP_FILE_RD |
 					       CEPH_CAP_FILE_LAZYIO));
 			/*
 			 * If we hold relevant caps, or in the case where we're
-- 
2.41.0

Re: [PATCH] ceph: remove the incorrect caps check in _file_size()

[Greg KH]

On Wed, Sep 06, 2023 at 08:17:47PM +0800, xiubli@redhat.com wrote:
> From: Xiubo Li <xiubli@redhat.com>
> 
> When truncating the inode the MDS will acquire the xlock for the
> ifile Locker, which will revoke the 'Frwsxl' caps from the clients.
> But when the client just releases and flushes the 'Fw' caps to MDS,
> for exmaple, and once the MDS receives the caps flushing msg it
> just thought the revocation has finished. Then the MDS will continue
> truncating the inode and then issued the truncate notification to
> all the clients. While just before the clients receives the cap
> flushing ack they receive the truncation notification, the clients
> will detecte that the 'issued | dirty' is still holding the 'Fw'
> caps.
> 
> Cc: stable@vger.kernel.org
> URL: https://tracker.ceph.com/issues/56693
> Signed-off-by: Xiubo Li <xiubli@redhat.com>
> ---
>  fs/ceph/inode.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)

What commit id does this fix?

thanks,

greg k-h

Re: [PATCH] ceph: remove the incorrect caps check in _file_size()

[Xiubo Li]

On 9/6/23 22:45, Greg KH wrote:
> On Wed, Sep 06, 2023 at 08:17:47PM +0800, xiubli@redhat.com wrote:
>> From: Xiubo Li <xiubli@redhat.com>
>>
>> When truncating the inode the MDS will acquire the xlock for the
>> ifile Locker, which will revoke the 'Frwsxl' caps from the clients.
>> But when the client just releases and flushes the 'Fw' caps to MDS,
>> for exmaple, and once the MDS receives the caps flushing msg it
>> just thought the revocation has finished. Then the MDS will continue
>> truncating the inode and then issued the truncate notification to
>> all the clients. While just before the clients receives the cap
>> flushing ack they receive the truncation notification, the clients
>> will detecte that the 'issued | dirty' is still holding the 'Fw'
>> caps.
>>
>> Cc: stable@vger.kernel.org
>> URL: https://tracker.ceph.com/issues/56693
>> Signed-off-by: Xiubo Li <xiubli@redhat.com>
>> ---
>>   fs/ceph/inode.c | 4 +---
>>   1 file changed, 1 insertion(+), 3 deletions(-)
> What commit id does this fix?

Oh, I forgot to mention that in the commit comment, it will fix:

b0d7c2231015 ceph: introduce i_truncate_mutex

Let me update the patch and send out the V2 for it.

Thanks

- Xiubo



> thanks,
>
> greg k-h
>