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Diffstat (limited to 'fs/cifs/cifssmb.c')
-rw-r--r--fs/cifs/cifssmb.c94
1 files changed, 75 insertions, 19 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 243d17696f06..071e2f21a7db 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -73,6 +73,16 @@ cifs_mark_open_files_invalid(struct cifs_tcon *tcon)
struct list_head *tmp;
struct list_head *tmp1;
+ /* only send once per connect */
+ spin_lock(&cifs_tcp_ses_lock);
+ if (tcon->ses->status != CifsGood ||
+ tcon->tidStatus != CifsNeedReconnect) {
+ spin_unlock(&cifs_tcp_ses_lock);
+ return;
+ }
+ tcon->tidStatus = CifsInFilesInvalidate;
+ spin_unlock(&cifs_tcp_ses_lock);
+
/* list all files open on tree connection and mark them invalid */
spin_lock(&tcon->open_file_lock);
list_for_each_safe(tmp, tmp1, &tcon->openFileList) {
@@ -89,6 +99,11 @@ cifs_mark_open_files_invalid(struct cifs_tcon *tcon)
memset(tcon->crfid.fid, 0, sizeof(struct cifs_fid));
mutex_unlock(&tcon->crfid.fid_mutex);
+ spin_lock(&cifs_tcp_ses_lock);
+ if (tcon->tidStatus == CifsInFilesInvalidate)
+ tcon->tidStatus = CifsNeedTcon;
+ spin_unlock(&cifs_tcp_ses_lock);
+
/*
* BB Add call to invalidate_inodes(sb) for all superblocks mounted
* to this tcon.
@@ -120,15 +135,18 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
* only tree disconnect, open, and write, (and ulogoff which does not
* have tcon) are allowed as we start force umount
*/
+ spin_lock(&cifs_tcp_ses_lock);
if (tcon->tidStatus == CifsExiting) {
if (smb_command != SMB_COM_WRITE_ANDX &&
smb_command != SMB_COM_OPEN_ANDX &&
smb_command != SMB_COM_TREE_DISCONNECT) {
+ spin_unlock(&cifs_tcp_ses_lock);
cifs_dbg(FYI, "can not send cmd %d while umounting\n",
smb_command);
return -ENODEV;
}
}
+ spin_unlock(&cifs_tcp_ses_lock);
retries = server->nr_targets;
@@ -148,8 +166,12 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
}
/* are we still trying to reconnect? */
- if (server->tcpStatus != CifsNeedReconnect)
+ spin_lock(&cifs_tcp_ses_lock);
+ if (server->tcpStatus != CifsNeedReconnect) {
+ spin_unlock(&cifs_tcp_ses_lock);
break;
+ }
+ spin_unlock(&cifs_tcp_ses_lock);
if (retries && --retries)
continue;
@@ -166,31 +188,49 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
retries = server->nr_targets;
}
- if (!ses->need_reconnect && !tcon->need_reconnect)
+ spin_lock(&ses->chan_lock);
+ if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
+ spin_unlock(&ses->chan_lock);
return 0;
+ }
+ spin_unlock(&ses->chan_lock);
nls_codepage = load_nls_default();
/*
- * need to prevent multiple threads trying to simultaneously
- * reconnect the same SMB session
- */
- mutex_lock(&ses->session_mutex);
-
- /*
* Recheck after acquire mutex. If another thread is negotiating
* and the server never sends an answer the socket will be closed
* and tcpStatus set to reconnect.
*/
+ spin_lock(&cifs_tcp_ses_lock);
if (server->tcpStatus == CifsNeedReconnect) {
+ spin_unlock(&cifs_tcp_ses_lock);
rc = -EHOSTDOWN;
- mutex_unlock(&ses->session_mutex);
goto out;
}
+ spin_unlock(&cifs_tcp_ses_lock);
- rc = cifs_negotiate_protocol(0, ses);
- if (rc == 0 && ses->need_reconnect)
- rc = cifs_setup_session(0, ses, nls_codepage);
+ /*
+ * need to prevent multiple threads trying to simultaneously
+ * reconnect the same SMB session
+ */
+ spin_lock(&ses->chan_lock);
+ if (!cifs_chan_needs_reconnect(ses, server)) {
+ spin_unlock(&ses->chan_lock);
+
+ /* this means that we only need to tree connect */
+ if (tcon->need_reconnect)
+ goto skip_sess_setup;
+
+ rc = -EHOSTDOWN;
+ goto out;
+ }
+ spin_unlock(&ses->chan_lock);
+
+ mutex_lock(&ses->session_mutex);
+ rc = cifs_negotiate_protocol(0, ses, server);
+ if (!rc)
+ rc = cifs_setup_session(0, ses, server, nls_codepage);
/* do we need to reconnect tcon? */
if (rc || !tcon->need_reconnect) {
@@ -198,6 +238,7 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
goto out;
}
+skip_sess_setup:
cifs_mark_open_files_invalid(tcon);
rc = cifs_tree_connect(0, tcon, nls_codepage);
mutex_unlock(&ses->session_mutex);
@@ -337,8 +378,13 @@ static int
smb_init_no_reconnect(int smb_command, int wct, struct cifs_tcon *tcon,
void **request_buf, void **response_buf)
{
- if (tcon->ses->need_reconnect || tcon->need_reconnect)
+ spin_lock(&tcon->ses->chan_lock);
+ if (cifs_chan_needs_reconnect(tcon->ses, tcon->ses->server) ||
+ tcon->need_reconnect) {
+ spin_unlock(&tcon->ses->chan_lock);
return -EHOSTDOWN;
+ }
+ spin_unlock(&tcon->ses->chan_lock);
return __smb_init(smb_command, wct, tcon, request_buf, response_buf);
}
@@ -476,14 +522,15 @@ should_set_ext_sec_flag(enum securityEnum sectype)
}
int
-CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
+CIFSSMBNegotiate(const unsigned int xid,
+ struct cifs_ses *ses,
+ struct TCP_Server_Info *server)
{
NEGOTIATE_REQ *pSMB;
NEGOTIATE_RSP *pSMBr;
int rc = 0;
int bytes_returned;
int i;
- struct TCP_Server_Info *server = ses->server;
u16 count;
if (!server) {
@@ -600,8 +647,12 @@ CIFSSMBTDis(const unsigned int xid, struct cifs_tcon *tcon)
* the tcon is no longer on the list, so no need to take lock before
* checking this.
*/
- if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
- return 0;
+ spin_lock(&tcon->ses->chan_lock);
+ if ((tcon->need_reconnect) || CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses)) {
+ spin_unlock(&tcon->ses->chan_lock);
+ return -EIO;
+ }
+ spin_unlock(&tcon->ses->chan_lock);
rc = small_smb_init(SMB_COM_TREE_DISCONNECT, 0, tcon,
(void **)&smb_buffer);
@@ -696,9 +747,14 @@ CIFSSMBLogoff(const unsigned int xid, struct cifs_ses *ses)
return -EIO;
mutex_lock(&ses->session_mutex);
- if (ses->need_reconnect)
+ spin_lock(&ses->chan_lock);
+ if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
+ spin_unlock(&ses->chan_lock);
goto session_already_dead; /* no need to send SMBlogoff if uid
already closed due to reconnect */
+ }
+ spin_unlock(&ses->chan_lock);
+
rc = small_smb_init(SMB_COM_LOGOFF_ANDX, 2, NULL, (void **)&pSMB);
if (rc) {
mutex_unlock(&ses->session_mutex);
@@ -1401,7 +1457,7 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
if (server->ops->is_session_expired &&
server->ops->is_session_expired(buf)) {
- cifs_reconnect(server);
+ cifs_reconnect(server, true);
return -1;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.