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authorJeff Layton <jlayton@redhat.com>2008-11-14 13:44:38 -0500
committerSteve French <sfrench@us.ibm.com>2008-11-14 23:42:32 +0000
commite7ddee9037e7dd43de1ad08b51727e552aedd836 (patch)
tree1f4fa723aad80809c5980fcb197aba90a84c26ca /fs/cifs/cifssmb.c
parent3ec332ef7a38c2327e18d087d4120a8e3bd3dc6e (diff)
cifs: disable sharing session and tcon and add new TCP sharing code
The code that allows these structs to be shared is extremely racy. Disable the sharing of SMB and tcon structs for now until we can come up with a way to do this that's race free. We want to continue to share TCP sessions, however since they are required for multiuser mounts. For that, implement a new (hopefully race-free) scheme. Add a new global list of TCP sessions, and take care to get a reference to it whenever we're dealing with one. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/cifssmb.c')
-rw-r--r--fs/cifs/cifssmb.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 7f0651b6957..cd9e9a145e4 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -664,8 +664,9 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
rc = -EIO;
goto neg_err_exit;
}
-
- if (server->socketUseCount.counter > 1) {
+ read_lock(&cifs_tcp_ses_lock);
+ if (server->srv_count > 1) {
+ read_unlock(&cifs_tcp_ses_lock);
if (memcmp(server->server_GUID,
pSMBr->u.extended_response.
GUID, 16) != 0) {
@@ -674,9 +675,11 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
pSMBr->u.extended_response.GUID,
16);
}
- } else
+ } else {
+ read_unlock(&cifs_tcp_ses_lock);
memcpy(server->server_GUID,
pSMBr->u.extended_response.GUID, 16);
+ }
if (count == 16) {
server->secType = RawNTLMSSP;
@@ -830,12 +833,9 @@ CIFSSMBLogoff(const int xid, struct cifsSesInfo *ses)
pSMB->AndXCommand = 0xFF;
rc = SendReceiveNoRsp(xid, ses, (struct smb_hdr *) pSMB, 0);
session_already_dead:
- atomic_dec(&ses->server->socketUseCount);
- if (atomic_read(&ses->server->socketUseCount) == 0) {
- spin_lock(&GlobalMid_Lock);
- ses->server->tcpStatus = CifsExiting;
- spin_unlock(&GlobalMid_Lock);
- rc = -ESHUTDOWN;
+ if (ses->server) {
+ cifs_put_tcp_session(ses->server);
+ rc = 0;
}
up(&ses->sesSem);