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-rw-r--r--fs/cifs/cifs_debug.c2
-rw-r--r--fs/cifs/cifsfs.c3
-rw-r--r--fs/cifs/cifsglob.h17
-rw-r--r--fs/cifs/cifsproto.h1
-rw-r--r--fs/cifs/cifssmb.c18
-rw-r--r--fs/cifs/connect.c206
6 files changed, 95 insertions, 152 deletions
diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index ba8723d95996..40b5108fb4f9 100644
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -144,7 +144,7 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
seq_printf(m, "TCP status: %d\n\tLocal Users To "
"Server: %d SecMode: 0x%x Req On Wire: %d",
ses->server->tcpStatus,
- atomic_read(&ses->server->socketUseCount),
+ ses->server->srv_count,
ses->server->secMode,
atomic_read(&ses->server->inFlight));
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index f7f28cc986ea..48c484660712 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -1013,7 +1013,7 @@ init_cifs(void)
{
int rc = 0;
cifs_proc_init();
- INIT_LIST_HEAD(&global_cifs_sock_list);
+ INIT_LIST_HEAD(&cifs_tcp_ses_list);
INIT_LIST_HEAD(&GlobalSMBSessionList); /* BB to be removed by jl */
INIT_LIST_HEAD(&GlobalTreeConnectionList); /* BB to be removed by jl */
INIT_LIST_HEAD(&GlobalOplock_Q);
@@ -1043,6 +1043,7 @@ init_cifs(void)
GlobalMaxActiveXid = 0;
memset(Local_System_Name, 0, 15);
rwlock_init(&GlobalSMBSeslock);
+ rwlock_init(&cifs_tcp_ses_lock);
spin_lock_init(&GlobalMid_Lock);
if (cifs_max_pending < 2) {
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 781e4d66f914..fa1fb787c209 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -123,6 +123,7 @@ struct cifs_cred {
struct TCP_Server_Info {
struct list_head tcp_ses_list;
struct list_head smb_ses_list;
+ int srv_count; /* reference counter */
/* 15 character server name + 0x20 16th byte indicating type = srv */
char server_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
char unicode_server_Name[SERVER_NAME_LEN_WITH_NULL * 2];
@@ -144,7 +145,6 @@ struct TCP_Server_Info {
bool svlocal:1; /* local server or remote */
bool noblocksnd; /* use blocking sendmsg */
bool noautotune; /* do not autotune send buf sizes */
- atomic_t socketUseCount; /* number of open cifs sessions on socket */
atomic_t inFlight; /* number of requests on the wire to server */
#ifdef CONFIG_CIFS_STATS2
atomic_t inSend; /* requests trying to send */
@@ -589,13 +589,18 @@ require use of the stronger protocol */
#define GLOBAL_EXTERN extern
#endif
-
-/* the list of TCP_Server_Info structures, ie each of the sockets
+/*
+ * the list of TCP_Server_Info structures, ie each of the sockets
* connecting our client to a distinct server (ip address), is
- * chained together by global_cifs_sock_list. The list of all our SMB
+ * chained together by cifs_tcp_ses_list. The list of all our SMB
* sessions (and from that the tree connections) can be found
- * by iterating over global_cifs_sock_list */
-GLOBAL_EXTERN struct list_head global_cifs_sock_list;
+ * by iterating over cifs_tcp_ses_list
+ */
+GLOBAL_EXTERN struct list_head cifs_tcp_ses_list;
+
+/* protects cifs_tcp_ses_list and srv_count for each tcp session */
+GLOBAL_EXTERN rwlock_t cifs_tcp_ses_lock;
+
GLOBAL_EXTERN struct list_head GlobalSMBSessionList; /* BB to be removed by jl*/
GLOBAL_EXTERN struct list_head GlobalTreeConnectionList; /* BB to be removed */
GLOBAL_EXTERN rwlock_t GlobalSMBSeslock; /* protects list inserts on 3 above */
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index ca91f162364d..b50f4e5a52f4 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -102,6 +102,7 @@ extern void acl_to_uid_mode(struct inode *inode, const char *path,
const __u16 *pfid);
extern int mode_to_acl(struct inode *inode, const char *path, __u64);
+extern void cifs_put_tcp_session(struct TCP_Server_Info *server);
extern int cifs_mount(struct super_block *, struct cifs_sb_info *, char *,
const char *);
extern int cifs_umount(struct super_block *, struct cifs_sb_info *);
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 47c59145cf30..38d42fb458f6 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);
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 05efa2725f21..c77cded57961 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -657,6 +657,11 @@ multi_t2_fnd:
}
} /* end while !EXITING */
+ /* take it off the list, if it's not already */
+ write_lock(&cifs_tcp_ses_lock);
+ list_del_init(&server->tcp_ses_list);
+ write_unlock(&cifs_tcp_ses_lock);
+
spin_lock(&GlobalMid_Lock);
server->tcpStatus = CifsExiting;
spin_unlock(&GlobalMid_Lock);
@@ -1346,92 +1351,66 @@ cifs_parse_mount_options(char *options, const char *devname,
return 0;
}
-static struct cifsSesInfo *
-cifs_find_tcp_session(struct in_addr *target_ip_addr,
- struct in6_addr *target_ip6_addr,
- char *userName, struct TCP_Server_Info **psrvTcp)
+static struct TCP_Server_Info *
+cifs_find_tcp_session(struct sockaddr *addr)
{
struct list_head *tmp;
- struct cifsSesInfo *ses;
-
- *psrvTcp = NULL;
-
- read_lock(&GlobalSMBSeslock);
- list_for_each(tmp, &GlobalSMBSessionList) {
- ses = list_entry(tmp, struct cifsSesInfo, cifsSessionList);
- if (!ses->server)
+ struct TCP_Server_Info *server;
+ struct sockaddr_in *addr4 = (struct sockaddr_in *) addr;
+ struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) addr;
+
+ write_lock(&cifs_tcp_ses_lock);
+ list_for_each(tmp, &cifs_tcp_ses_list) {
+ server = list_entry(tmp, struct TCP_Server_Info,
+ tcp_ses_list);
+
+ /*
+ * the demux thread can exit on its own while still in CifsNew
+ * so don't accept any sockets in that state. Since the
+ * tcpStatus never changes back to CifsNew it's safe to check
+ * for this without a lock.
+ */
+ if (server->tcpStatus == CifsNew)
continue;
- if (target_ip_addr &&
- ses->server->addr.sockAddr.sin_addr.s_addr != target_ip_addr->s_addr)
- continue;
- else if (target_ip6_addr &&
- memcmp(&ses->server->addr.sockAddr6.sin6_addr,
- target_ip6_addr, sizeof(*target_ip6_addr)))
- continue;
- /* BB lock server and tcp session; increment use count here?? */
-
- /* found a match on the TCP session */
- *psrvTcp = ses->server;
+ if (addr->sa_family == AF_INET &&
+ (addr4->sin_addr.s_addr !=
+ server->addr.sockAddr.sin_addr.s_addr))
+ continue;
+ else if (addr->sa_family == AF_INET6 &&
+ memcmp(&server->addr.sockAddr6.sin6_addr,
+ &addr6->sin6_addr, sizeof(addr6->sin6_addr)))
+ continue;
- /* BB check if reconnection needed */
- if (strncmp(ses->userName, userName, MAX_USERNAME_SIZE) == 0) {
- read_unlock(&GlobalSMBSeslock);
- /* Found exact match on both TCP and
- SMB sessions */
- return ses;
- }
- /* else tcp and smb sessions need reconnection */
+ ++server->srv_count;
+ write_unlock(&cifs_tcp_ses_lock);
+ return server;
}
- read_unlock(&GlobalSMBSeslock);
-
+ write_unlock(&cifs_tcp_ses_lock);
return NULL;
}
-static struct cifsTconInfo *
-find_unc(__be32 new_target_ip_addr, char *uncName, char *userName)
+void
+cifs_put_tcp_session(struct TCP_Server_Info *server)
{
- struct list_head *tmp;
- struct cifsTconInfo *tcon;
- __be32 old_ip;
-
- read_lock(&GlobalSMBSeslock);
-
- list_for_each(tmp, &GlobalTreeConnectionList) {
- cFYI(1, ("Next tcon"));
- tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
- if (!tcon->ses || !tcon->ses->server)
- continue;
-
- old_ip = tcon->ses->server->addr.sockAddr.sin_addr.s_addr;
- cFYI(1, ("old ip addr: %x == new ip %x ?",
- old_ip, new_target_ip_addr));
-
- if (old_ip != new_target_ip_addr)
- continue;
-
- /* BB lock tcon, server, tcp session and increment use count? */
- /* found a match on the TCP session */
- /* BB check if reconnection needed */
- cFYI(1, ("IP match, old UNC: %s new: %s",
- tcon->treeName, uncName));
+ struct task_struct *task;
- if (strncmp(tcon->treeName, uncName, MAX_TREE_SIZE))
- continue;
+ write_lock(&cifs_tcp_ses_lock);
+ if (--server->srv_count > 0) {
+ write_unlock(&cifs_tcp_ses_lock);
+ return;
+ }
- cFYI(1, ("and old usr: %s new: %s",
- tcon->treeName, uncName));
+ list_del_init(&server->tcp_ses_list);
+ write_unlock(&cifs_tcp_ses_lock);
- if (strncmp(tcon->ses->userName, userName, MAX_USERNAME_SIZE))
- continue;
-
- /* matched smb session (user name) */
- read_unlock(&GlobalSMBSeslock);
- return tcon;
- }
+ spin_lock(&GlobalMid_Lock);
+ server->tcpStatus = CifsExiting;
+ spin_unlock(&GlobalMid_Lock);
- read_unlock(&GlobalSMBSeslock);
- return NULL;
+ task = xchg(&server->tsk, NULL);
+ if (task)
+ force_sig(SIGKILL, task);
}
int
@@ -2046,21 +2025,10 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
}
}
- if (addr.sa_family == AF_INET)
- existingCifsSes = cifs_find_tcp_session(&sin_server->sin_addr,
- NULL /* no ipv6 addr */,
- volume_info.username, &srvTcp);
- else if (addr.sa_family == AF_INET6) {
- cFYI(1, ("looking for ipv6 address"));
- existingCifsSes = cifs_find_tcp_session(NULL /* no ipv4 addr */,
- &sin_server6->sin6_addr,
- volume_info.username, &srvTcp);
- } else {
- rc = -EINVAL;
- goto out;
- }
-
- if (!srvTcp) {
+ srvTcp = cifs_find_tcp_session(&addr);
+ if (srvTcp) {
+ cFYI(1, ("Existing tcp session with server found"));
+ } else { /* create socket */
if (addr.sa_family == AF_INET6) {
cFYI(1, ("attempting ipv6 connect"));
/* BB should we allow ipv6 on port 139? */
@@ -2130,6 +2098,12 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
memcpy(srvTcp->server_RFC1001_name,
volume_info.target_rfc1001_name, 16);
srvTcp->sequence_number = 0;
+ INIT_LIST_HEAD(&srvTcp->tcp_ses_list);
+ ++srvTcp->srv_count;
+ write_lock(&cifs_tcp_ses_lock);
+ list_add(&srvTcp->tcp_ses_list,
+ &cifs_tcp_ses_list);
+ write_unlock(&cifs_tcp_ses_lock);
}
}
@@ -2181,17 +2155,12 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
rc = cifs_setup_session(xid, pSesInfo,
cifs_sb->local_nls);
up(&pSesInfo->sesSem);
- if (!rc)
- atomic_inc(&srvTcp->socketUseCount);
}
}
/* search for existing tcon to this server share */
if (!rc) {
setup_cifs_sb(&volume_info, cifs_sb);
- tcon =
- find_unc(sin_server->sin_addr.s_addr, volume_info.UNC,
- volume_info.username);
if (tcon) {
cFYI(1, ("Found match on UNC path"));
if (tcon->seal != volume_info.seal)
@@ -2248,47 +2217,22 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
/* on error free sesinfo and tcon struct if needed */
mount_fail_check:
if (rc) {
- /* if session setup failed, use count is zero but
- we still need to free cifsd thread */
- if (atomic_read(&srvTcp->socketUseCount) == 0) {
- spin_lock(&GlobalMid_Lock);
- srvTcp->tcpStatus = CifsExiting;
- spin_unlock(&GlobalMid_Lock);
- if (srvTcp->tsk) {
- /* If we could verify that kthread_stop would
- always wake up processes blocked in
- tcp in recv_mesg then we could remove the
- send_sig call */
- force_sig(SIGKILL, srvTcp->tsk);
- kthread_stop(srvTcp->tsk);
- }
- }
/* If find_unc succeeded then rc == 0 so we can not end */
- if (tcon) /* up accidently freeing someone elses tcon struct */
+ /* up accidently freeing someone elses tcon struct */
+ if (tcon)
tconInfoFree(tcon);
+
if (existingCifsSes == NULL) {
if (pSesInfo) {
if ((pSesInfo->server) &&
- (pSesInfo->status == CifsGood)) {
- int temp_rc;
- temp_rc = CIFSSMBLogoff(xid, pSesInfo);
- /* if the socketUseCount is now zero */
- if ((temp_rc == -ESHUTDOWN) &&
- (pSesInfo->server) &&
- (pSesInfo->server->tsk)) {
- force_sig(SIGKILL,
- pSesInfo->server->tsk);
- kthread_stop(pSesInfo->server->tsk);
- }
- } else {
+ (pSesInfo->status == CifsGood))
+ CIFSSMBLogoff(xid, pSesInfo);
+ else {
cFYI(1, ("No session or bad tcon"));
- if ((pSesInfo->server) &&
- (pSesInfo->server->tsk)) {
- force_sig(SIGKILL,
- pSesInfo->server->tsk);
- kthread_stop(pSesInfo->server->tsk);
- }
}
+ if (pSesInfo->server)
+ cifs_put_tcp_session(
+ pSesInfo->server);
sesInfoFree(pSesInfo);
/* pSesInfo = NULL; */
}
@@ -3596,15 +3540,7 @@ cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
if (rc == -EBUSY) {
FreeXid(xid);
return 0;
- } else if (rc == -ESHUTDOWN) {
- cFYI(1, ("Waking up socket by sending signal"));
- if (cifsd_task) {
- force_sig(SIGKILL, cifsd_task);
- kthread_stop(cifsd_task);
- }
- rc = 0;
- } /* else - we have an smb session
- left on this socket do not kill cifsd */
+ }
} else
cFYI(1, ("No session or bad tcon"));
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-19 00:56:03 +0000