diff options
| author | Paulo Alcantara <pc@cjr.nz> | 2020-11-28 19:57:06 +0100 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2020-11-30 22:23:31 +0100 |
| commit | 6988a619f5b79e4efadea6e19dcfe75fbcd350b5 (patch) | |
| tree | b96fd208d38e71366088e41e7078b9a79ae97efc /fs | |
| parent | Linux 5.10-rc6 (diff) | |
| download | linux-6988a619f5b79e4efadea6e19dcfe75fbcd350b5.tar.xz linux-6988a619f5b79e4efadea6e19dcfe75fbcd350b5.zip | |
cifs: allow syscalls to be restarted in __smb_send_rqst()
A customer has reported that several files in their multi-threaded app
were left with size of 0 because most of the read(2) calls returned
-EINTR and they assumed no bytes were read. Obviously, they could
have fixed it by simply retrying on -EINTR.
We noticed that most of the -EINTR on read(2) were due to real-time
signals sent by glibc to process wide credential changes (SIGRT_1),
and its signal handler had been established with SA_RESTART, in which
case those calls could have been automatically restarted by the
kernel.
Let the kernel decide to whether or not restart the syscalls when
there is a signal pending in __smb_send_rqst() by returning
-ERESTARTSYS. If it can't, it will return -EINTR anyway.
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/cifs/transport.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index e27e255d40dd..36b2ece43403 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -339,8 +339,8 @@ __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, return -EAGAIN; if (signal_pending(current)) { - cifs_dbg(FYI, "signal is pending before sending any data\n"); - return -EINTR; + cifs_dbg(FYI, "signal pending before send request\n"); + return -ERESTARTSYS; } /* cork the socket */ |