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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>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Pavel Shilovsky 2019-11-12 17:16:35 -08:00 committed by Steve French
parent 037d050724
commit 44805b0e62
1 changed files with 7 additions and 0 deletions
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7
fs/cifs/file.c
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@ -728,6 +728,13 @@ 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);