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author | 2013-10-12 10:06:03 -0500 | |
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committer | 2013-11-02 12:52:35 -0500 | |
commit | 7f48558e6489d032b1584b0cc9ac4bb11072c034 (patch) | |
tree | 54c6b7529085229d53cae09cada37d548f848f26 /fs/cifs | |
parent | cifs: Make big endian multiplex ID sequences monotonic on the wire (diff) | |
download | linux-7f48558e6489d032b1584b0cc9ac4bb11072c034.tar.gz linux-7f48558e6489d032b1584b0cc9ac4bb11072c034.tar.bz2 linux-7f48558e6489d032b1584b0cc9ac4bb11072c034.zip |
cifs: Send a logoff request before removing a smb session
Send a smb session logoff request before removing smb session off of the list.
On a signed smb session, remvoing a session off of the list before sending
a logoff request results in server returning an error for lack of
smb signature.
Never seen an error during smb logoff, so as per MS-SMB2 3.2.5.1,
not sure how an error during logoff should be retried. So for now,
if a server returns an error to a logoff request, log the error and
remove the session off of the list.
Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r-- | fs/cifs/connect.c | 25 | ||||
-rw-r--r-- | fs/cifs/smb2transport.c | 10 | ||||
-rw-r--r-- | fs/cifs/transport.c | 11 |
3 files changed, 37 insertions, 9 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index a279ffc0bc29..62a55147400a 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -2242,6 +2242,8 @@ cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol) spin_lock(&cifs_tcp_ses_lock); list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { + if (ses->status == CifsExiting) + continue; if (!match_session(ses, vol)) continue; ++ses->ses_count; @@ -2255,24 +2257,37 @@ cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol) static void cifs_put_smb_ses(struct cifs_ses *ses) { - unsigned int xid; + unsigned int rc, xid; struct TCP_Server_Info *server = ses->server; cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count); + spin_lock(&cifs_tcp_ses_lock); + if (ses->status == CifsExiting) { + spin_unlock(&cifs_tcp_ses_lock); + return; + } if (--ses->ses_count > 0) { spin_unlock(&cifs_tcp_ses_lock); return; } - - list_del_init(&ses->smb_ses_list); + if (ses->status == CifsGood) + ses->status = CifsExiting; spin_unlock(&cifs_tcp_ses_lock); - if (ses->status == CifsGood && server->ops->logoff) { + if (ses->status == CifsExiting && server->ops->logoff) { xid = get_xid(); - server->ops->logoff(xid, ses); + rc = server->ops->logoff(xid, ses); + if (rc) + cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n", + __func__, rc); _free_xid(xid); } + + spin_lock(&cifs_tcp_ses_lock); + list_del_init(&ses->smb_ses_list); + spin_unlock(&cifs_tcp_ses_lock); + sesInfoFree(ses); cifs_put_tcp_session(server); } diff --git a/fs/cifs/smb2transport.c b/fs/cifs/smb2transport.c index c523617eade2..59c748ce872f 100644 --- a/fs/cifs/smb2transport.c +++ b/fs/cifs/smb2transport.c @@ -516,13 +516,19 @@ smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_hdr *buf, return -EAGAIN; } - if (ses->status != CifsGood) { - /* check if SMB2 session is bad because we are setting it up */ + if (ses->status == CifsNew) { if ((buf->Command != SMB2_SESSION_SETUP) && (buf->Command != SMB2_NEGOTIATE)) return -EAGAIN; /* else ok - we are setting up session */ } + + if (ses->status == CifsExiting) { + if (buf->Command != SMB2_LOGOFF) + return -EAGAIN; + /* else ok - we are shutting down the session */ + } + *mid = smb2_mid_entry_alloc(buf, ses->server); if (*mid == NULL) return -ENOMEM; diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index 0ee6d249ef6f..b37570952846 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -431,13 +431,20 @@ static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, return -EAGAIN; } - if (ses->status != CifsGood) { - /* check if SMB session is bad because we are setting it up */ + if (ses->status == CifsNew) { if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && (in_buf->Command != SMB_COM_NEGOTIATE)) return -EAGAIN; /* else ok - we are setting up session */ } + + if (ses->status == CifsExiting) { + /* check if SMB session is bad because we are setting it up */ + if (in_buf->Command != SMB_COM_LOGOFF_ANDX) + return -EAGAIN; + /* else ok - we are shutting down session */ + } + *ppmidQ = AllocMidQEntry(in_buf, ses->server); if (*ppmidQ == NULL) return -ENOMEM; |