* [PATCH] CIFS: Respect O_SYNC and O_DIRECT flags during reconnect
@ 2019-11-13 1:16 Pavel Shilovsky
2019-11-13 3:32 ` Ronnie Sahlberg
0 siblings, 1 reply; 3+ messages in thread
From: Pavel Shilovsky @ 2019-11-13 1:16 UTC (permalink / raw)
To: linux-cifs, smfrench
Currently the client translates O_SYNC and O_DIRECT flags
into corresponding SMB create options when openning a file.
The problem is that on reconnect when the file is being
re-opened the client doesn't set those flags and it causes
a server to reject re-open requests because create options
don't match. The latter means that any subsequent system
call against that open file fail until a share is re-mounted.
Fix this by properly setting SMB create options when
re-openning files after reconnects.
Fixes: 1013e760d10e6: ("SMB3: Don't ignore O_SYNC/O_DSYNC and O_DIRECT flags")
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
---
fs/cifs/file.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index b6f544bc6c73..89617bb058ae 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -721,6 +721,13 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
if (backup_cred(cifs_sb))
create_options |= CREATE_OPEN_BACKUP_INTENT;
+ /* O_SYNC also has bit for O_DSYNC so following check picks up either */
+ if (cfile->f_flags & O_SYNC)
+ create_options |= CREATE_WRITE_THROUGH;
+
+ if (cfile->f_flags & O_DIRECT)
+ create_options |= CREATE_NO_BUFFER;
+
if (server->ops->get_lease_key)
server->ops->get_lease_key(inode, &cfile->fid);
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] CIFS: Respect O_SYNC and O_DIRECT flags during reconnect
2019-11-13 1:16 [PATCH] CIFS: Respect O_SYNC and O_DIRECT flags during reconnect Pavel Shilovsky
@ 2019-11-13 3:32 ` Ronnie Sahlberg
2019-11-13 5:36 ` Steve French
0 siblings, 1 reply; 3+ messages in thread
From: Ronnie Sahlberg @ 2019-11-13 3:32 UTC (permalink / raw)
To: Pavel Shilovsky; +Cc: linux-cifs, smfrench
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
----- Original Message -----
From: "Pavel Shilovsky" <piastryyy@gmail.com>
To: linux-cifs@vger.kernel.org, smfrench@gmail.com
Sent: Wednesday, 13 November, 2019 11:16:35 AM
Subject: [PATCH] CIFS: Respect O_SYNC and O_DIRECT flags during reconnect
Currently the client translates O_SYNC and O_DIRECT flags
into corresponding SMB create options when openning a file.
The problem is that on reconnect when the file is being
re-opened the client doesn't set those flags and it causes
a server to reject re-open requests because create options
don't match. The latter means that any subsequent system
call against that open file fail until a share is re-mounted.
Fix this by properly setting SMB create options when
re-openning files after reconnects.
Fixes: 1013e760d10e6: ("SMB3: Don't ignore O_SYNC/O_DSYNC and O_DIRECT flags")
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
---
fs/cifs/file.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index b6f544bc6c73..89617bb058ae 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -721,6 +721,13 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
if (backup_cred(cifs_sb))
create_options |= CREATE_OPEN_BACKUP_INTENT;
+ /* O_SYNC also has bit for O_DSYNC so following check picks up either */
+ if (cfile->f_flags & O_SYNC)
+ create_options |= CREATE_WRITE_THROUGH;
+
+ if (cfile->f_flags & O_DIRECT)
+ create_options |= CREATE_NO_BUFFER;
+
if (server->ops->get_lease_key)
server->ops->get_lease_key(inode, &cfile->fid);
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] CIFS: Respect O_SYNC and O_DIRECT flags during reconnect
2019-11-13 3:32 ` Ronnie Sahlberg
@ 2019-11-13 5:36 ` Steve French
0 siblings, 0 replies; 3+ messages in thread
From: Steve French @ 2019-11-13 5:36 UTC (permalink / raw)
To: Ronnie Sahlberg; +Cc: Pavel Shilovsky, CIFS
merged into cifs-2.6.git for-next and also updated the github tree
(used by the buildbot e.g.)
On Tue, Nov 12, 2019 at 9:32 PM Ronnie Sahlberg <lsahlber@redhat.com> wrote:
>
> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
>
>
> ----- Original Message -----
> From: "Pavel Shilovsky" <piastryyy@gmail.com>
> To: linux-cifs@vger.kernel.org, smfrench@gmail.com
> Sent: Wednesday, 13 November, 2019 11:16:35 AM
> Subject: [PATCH] CIFS: Respect O_SYNC and O_DIRECT flags during reconnect
>
> Currently the client translates O_SYNC and O_DIRECT flags
> into corresponding SMB create options when openning a file.
> The problem is that on reconnect when the file is being
> re-opened the client doesn't set those flags and it causes
> a server to reject re-open requests because create options
> don't match. The latter means that any subsequent system
> call against that open file fail until a share is re-mounted.
>
> Fix this by properly setting SMB create options when
> re-openning files after reconnects.
>
> Fixes: 1013e760d10e6: ("SMB3: Don't ignore O_SYNC/O_DSYNC and O_DIRECT flags")
> Cc: Stable <stable@vger.kernel.org>
> Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
> ---
> fs/cifs/file.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/fs/cifs/file.c b/fs/cifs/file.c
> index b6f544bc6c73..89617bb058ae 100644
> --- a/fs/cifs/file.c
> +++ b/fs/cifs/file.c
> @@ -721,6 +721,13 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
> if (backup_cred(cifs_sb))
> create_options |= CREATE_OPEN_BACKUP_INTENT;
>
> + /* O_SYNC also has bit for O_DSYNC so following check picks up either */
> + if (cfile->f_flags & O_SYNC)
> + create_options |= CREATE_WRITE_THROUGH;
> +
> + if (cfile->f_flags & O_DIRECT)
> + create_options |= CREATE_NO_BUFFER;
> +
> if (server->ops->get_lease_key)
> server->ops->get_lease_key(inode, &cfile->fid);
>
> --
> 2.17.1
>
--
Thanks,
Steve
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-11-13 1:16 [PATCH] CIFS: Respect O_SYNC and O_DIRECT flags during reconnect Pavel Shilovsky
2019-11-13 3:32 ` Ronnie Sahlberg
2019-11-13 5:36 ` Steve French
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