Merge branch 'for-next'

fs/cifs/README

@@ -527,6 +527,11 @@ A partial list of the supported mount options follows:
 		SFU does).  In the future the bottom 9 bits of the
 		mode also will be emulated using queries of the security
 		descriptor (ACL).
+ mfsymlinks     Enable support for Minshall+French symlinks
+		(see http://wiki.samba.org/index.php/UNIX_Extensions#Minshall.2BFrench_symlinks)
+		This option is ignored when specified together with the
+		'sfu' option. Minshall+French symlinks are used even if
+		the server supports the CIFS Unix Extensions.
  sign           Must use packet signing (helps avoid unwanted data modification
 		by intermediate systems in the route).  Note that signing
 		does not work with lanman or plaintext authentication.

fs/cifs/cifs_debug.h

@@ -34,7 +34,7 @@ void cifs_dump_mids(struct TCP_Server_Info *);
 extern int traceSMB;		/* flag which enables the function below */
 void dump_smb(struct smb_hdr *, int);
 #define CIFS_INFO	0x01
-#define CIFS_RC  	0x02
+#define CIFS_RC		0x02
 #define CIFS_TIMER	0x04
 
 /*

fs/cifs/cifs_dfs_ref.c

@@ -306,6 +306,7 @@ cifs_dfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
 	int xid, i;
 	int rc = 0;
 	struct vfsmount *mnt = ERR_PTR(-ENOENT);
+	struct tcon_link *tlink;
 
 	cFYI(1, "in %s", __func__);
 	BUG_ON(IS_ROOT(dentry));
@@ -315,14 +316,6 @@ cifs_dfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
 	dput(nd->path.dentry);
 	nd->path.dentry = dget(dentry);
 
-	cifs_sb = CIFS_SB(dentry->d_inode->i_sb);
-	ses = cifs_sb->tcon->ses;
-
-	if (!ses) {
-		rc = -EINVAL;
-		goto out_err;
-	}
-
 	/*
 	 * The MSDFS spec states that paths in DFS referral requests and
 	 * responses must be prefixed by a single '\' character instead of
@@ -335,10 +328,20 @@ cifs_dfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
 		goto out_err;
 	}
 
-	rc = get_dfs_path(xid, ses , full_path + 1, cifs_sb->local_nls,
+	cifs_sb = CIFS_SB(dentry->d_inode->i_sb);
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink)) {
+		rc = PTR_ERR(tlink);
+		goto out_err;
+	}
+	ses = tlink_tcon(tlink)->ses;
+
+	rc = get_dfs_path(xid, ses, full_path + 1, cifs_sb->local_nls,
 		&num_referrals, &referrals,
 		cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 
+	cifs_put_tlink(tlink);
+
 	for (i = 0; i < num_referrals; i++) {
 		int len;
 		dump_referral(referrals+i);

fs/cifs/cifs_fs_sb.h

@@ -15,6 +15,8 @@
  *   the GNU Lesser General Public License for more details.
  *
  */
+#include <linux/radix-tree.h>
+
 #ifndef _CIFS_FS_SB_H
 #define _CIFS_FS_SB_H
 
@@ -36,10 +38,13 @@
 #define CIFS_MOUNT_NOPOSIXBRL   0x2000 /* mandatory not posix byte range lock */
 #define CIFS_MOUNT_NOSSYNC      0x4000 /* don't do slow SMBflush on every sync*/
 #define CIFS_MOUNT_FSCACHE	0x8000 /* local caching enabled */
+#define CIFS_MOUNT_MF_SYMLINKS	0x10000 /* Minshall+French Symlinks enabled */
+#define CIFS_MOUNT_MULTIUSER	0x20000 /* multiuser mount */
 
 struct cifs_sb_info {
-	struct cifsTconInfo *tcon;	/* primary mount */
-	struct list_head nested_tcon_q;
+	struct radix_tree_root tlink_tree;
+#define CIFS_TLINK_MASTER_TAG		0	/* is "master" (mount) tcon */
+	spinlock_t tlink_tree_lock;
 	struct nls_table *local_nls;
 	unsigned int rsize;
 	unsigned int wsize;
@@ -47,12 +52,13 @@ struct cifs_sb_info {
 	gid_t	mnt_gid;
 	mode_t	mnt_file_mode;
 	mode_t	mnt_dir_mode;
-	int     mnt_cifs_flags;
+	unsigned int mnt_cifs_flags;
 	int	prepathlen;
 	char   *prepath; /* relative path under the share to mount to */
 #ifdef CONFIG_CIFS_DFS_UPCALL
 	char   *mountdata; /* mount options received at mount time */
 #endif
 	struct backing_dev_info bdi;
+	struct delayed_work prune_tlinks;
 };
 #endif				/* _CIFS_FS_SB_H */

fs/cifs/cifsacl.c

@@ -557,11 +557,16 @@ static struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb,
 {
 	struct cifs_ntsd *pntsd = NULL;
 	int xid, rc;
+	struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
+
+	if (IS_ERR(tlink))
+		return NULL;
 
 	xid = GetXid();
-	rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
+	rc = CIFSSMBGetCIFSACL(xid, tlink_tcon(tlink), fid, &pntsd, pacllen);
 	FreeXid(xid);
 
+	cifs_put_tlink(tlink);
 
 	cFYI(1, "GetCIFSACL rc = %d ACL len %d", rc, *pacllen);
 	return pntsd;
@@ -574,10 +579,16 @@ static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb,
 	int oplock = 0;
 	int xid, rc;
 	__u16 fid;
+	struct cifsTconInfo *tcon;
+	struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
+
+	if (IS_ERR(tlink))
+		return NULL;
 
+	tcon = tlink_tcon(tlink);
 	xid = GetXid();
 
-	rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, READ_CONTROL, 0,
+	rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, READ_CONTROL, 0,
 			 &fid, &oplock, NULL, cifs_sb->local_nls,
 			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 	if (rc) {
@@ -585,11 +596,12 @@ static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb,
 		goto out;
 	}
 
-	rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
+	rc = CIFSSMBGetCIFSACL(xid, tcon, fid, &pntsd, pacllen);
 	cFYI(1, "GetCIFSACL rc = %d ACL len %d", rc, *pacllen);
 
-	CIFSSMBClose(xid, cifs_sb->tcon, fid);
+	CIFSSMBClose(xid, tcon, fid);
  out:
+	cifs_put_tlink(tlink);
 	FreeXid(xid);
 	return pntsd;
 }
@@ -603,7 +615,7 @@ static struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb,
 	struct cifsFileInfo *open_file = NULL;
 
 	if (inode)
-		open_file = find_readable_file(CIFS_I(inode));
+		open_file = find_readable_file(CIFS_I(inode), true);
 	if (!open_file)
 		return get_cifs_acl_by_path(cifs_sb, path, pacllen);
 
@@ -616,10 +628,15 @@ static int set_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb, __u16 fid,
 		struct cifs_ntsd *pnntsd, u32 acllen)
 {
 	int xid, rc;
+	struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
+
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
 
 	xid = GetXid();
-	rc = CIFSSMBSetCIFSACL(xid, cifs_sb->tcon, fid, pnntsd, acllen);
+	rc = CIFSSMBSetCIFSACL(xid, tlink_tcon(tlink), fid, pnntsd, acllen);
 	FreeXid(xid);
+	cifs_put_tlink(tlink);
 
 	cFYI(DBG2, "SetCIFSACL rc = %d", rc);
 	return rc;
@@ -631,10 +648,16 @@ static int set_cifs_acl_by_path(struct cifs_sb_info *cifs_sb, const char *path,
 	int oplock = 0;
 	int xid, rc;
 	__u16 fid;
+	struct cifsTconInfo *tcon;
+	struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
 
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+
+	tcon = tlink_tcon(tlink);
 	xid = GetXid();
 
-	rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, WRITE_DAC, 0,
+	rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, WRITE_DAC, 0,
 			 &fid, &oplock, NULL, cifs_sb->local_nls,
 			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 	if (rc) {
@@ -642,12 +665,13 @@ static int set_cifs_acl_by_path(struct cifs_sb_info *cifs_sb, const char *path,
 		goto out;
 	}
 
-	rc = CIFSSMBSetCIFSACL(xid, cifs_sb->tcon, fid, pnntsd, acllen);
+	rc = CIFSSMBSetCIFSACL(xid, tcon, fid, pnntsd, acllen);
 	cFYI(DBG2, "SetCIFSACL rc = %d", rc);
 
-	CIFSSMBClose(xid, cifs_sb->tcon, fid);
- out:
+	CIFSSMBClose(xid, tcon, fid);
+out:
 	FreeXid(xid);
+	cifs_put_tlink(tlink);
 	return rc;
 }
 
@@ -661,7 +685,7 @@ static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
 
 	cFYI(DBG2, "set ACL for %s from mode 0x%x", path, inode->i_mode);
 
-	open_file = find_readable_file(CIFS_I(inode));
+	open_file = find_readable_file(CIFS_I(inode), true);
 	if (!open_file)
 		return set_cifs_acl_by_path(cifs_sb, path, pnntsd, acllen);
 

fs/cifs/cifsencrypt.c

@@ -27,6 +27,7 @@
 #include "md5.h"
 #include "cifs_unicode.h"
 #include "cifsproto.h"
+#include "ntlmssp.h"
 #include <linux/ctype.h>
 #include <linux/random.h>
 
@@ -42,7 +43,7 @@ extern void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
 		       unsigned char *p24);
 
 static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
-				    const struct mac_key *key, char *signature)
+				const struct session_key *key, char *signature)
 {
 	struct	MD5Context context;
 
@@ -78,7 +79,7 @@ int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
 	server->sequence_number++;
 	spin_unlock(&GlobalMid_Lock);
 
-	rc = cifs_calculate_signature(cifs_pdu, &server->mac_signing_key,
+	rc = cifs_calculate_signature(cifs_pdu, &server->session_key,
 				      smb_signature);
 	if (rc)
 		memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
@@ -89,7 +90,7 @@ int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
 }
 
 static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
-				const struct mac_key *key, char *signature)
+				const struct session_key *key, char *signature)
 {
 	struct  MD5Context context;
 	int i;
@@ -145,7 +146,7 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 	server->sequence_number++;
 	spin_unlock(&GlobalMid_Lock);
 
-	rc = cifs_calc_signature2(iov, n_vec, &server->mac_signing_key,
+	rc = cifs_calc_signature2(iov, n_vec, &server->session_key,
 				      smb_signature);
 	if (rc)
 		memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
@@ -156,14 +157,14 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 }
 
 int cifs_verify_signature(struct smb_hdr *cifs_pdu,
-			  const struct mac_key *mac_key,
+			  const struct session_key *session_key,
 			  __u32 expected_sequence_number)
 {
 	unsigned int rc;
 	char server_response_sig[8];
 	char what_we_think_sig_should_be[20];
 
-	if ((cifs_pdu == NULL) || (mac_key == NULL))
+	if (cifs_pdu == NULL || session_key == NULL)
 		return -EINVAL;
 
 	if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
@@ -192,7 +193,7 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu,
 					cpu_to_le32(expected_sequence_number);
 	cifs_pdu->Signature.Sequence.Reserved = 0;
 
-	rc = cifs_calculate_signature(cifs_pdu, mac_key,
+	rc = cifs_calculate_signature(cifs_pdu, session_key,
 		what_we_think_sig_should_be);
 
 	if (rc)
@@ -209,7 +210,7 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu,
 }
 
 /* We fill in key by putting in 40 byte array which was allocated by caller */
-int cifs_calculate_mac_key(struct mac_key *key, const char *rn,
+int cifs_calculate_session_key(struct session_key *key, const char *rn,
 			   const char *password)
 {
 	char temp_key[16];
@@ -262,6 +263,90 @@ void calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 }
 #endif /* CIFS_WEAK_PW_HASH */
 
+/* This is just a filler for ntlmv2 type of security mechanisms.
+ * Older servers are not very particular about the contents of av pairs
+ * in the blob and for sec mechs like ntlmv2, there is no negotiation
+ * as in ntlmssp, so unless domain and server  netbios and dns names
+ * are specified, there is no way to obtain name.  In case of ntlmssp,
+ * server provides that info in type 2 challenge packet
+ */
+static int
+build_avpair_blob(struct cifsSesInfo *ses)
+{
+	struct ntlmssp2_name *attrptr;
+
+	ses->tilen = 2 * sizeof(struct ntlmssp2_name);
+	ses->tiblob = kzalloc(ses->tilen, GFP_KERNEL);
+	if (!ses->tiblob) {
+		ses->tilen = 0;
+		cERROR(1, "Challenge target info allocation failure");
+		return -ENOMEM;
+	}
+	attrptr = (struct ntlmssp2_name *) ses->tiblob;
+	attrptr->type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
+
+	return 0;
+}
+
+/* Server has provided av pairs/target info in the type 2 challenge
+ * packet and we have plucked it and stored within smb session.
+ * We parse that blob here to find netbios domain name to be used
+ * as part of ntlmv2 authentication (in Target String), if not already
+ * specified on the command line.
+ * If this function returns without any error but without fetching
+ * domain name, authentication may fail against some server but
+ * may not fail against other (those who are not very particular
+ * about target string i.e. for some, just user name might suffice.
+ */
+static int
+find_domain_name(struct cifsSesInfo *ses)
+{
+	unsigned int attrsize;
+	unsigned int type;
+	unsigned int onesize = sizeof(struct ntlmssp2_name);
+	unsigned char *blobptr;
+	unsigned char *blobend;
+	struct ntlmssp2_name *attrptr;
+
+	if (!ses->tilen || !ses->tiblob)
+		return 0;
+
+	blobptr = ses->tiblob;
+	blobend = ses->tiblob + ses->tilen;
+
+	while (blobptr + onesize < blobend) {
+		attrptr = (struct ntlmssp2_name *) blobptr;
+		type = le16_to_cpu(attrptr->type);
+		if (type == NTLMSSP_AV_EOL)
+			break;
+		blobptr += 2; /* advance attr type */
+		attrsize = le16_to_cpu(attrptr->length);
+		blobptr += 2; /* advance attr size */
+		if (blobptr + attrsize > blobend)
+			break;
+		if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
+			if (!attrsize)
+				break;
+			if (!ses->domainName) {
+				struct nls_table *default_nls;
+				ses->domainName =
+					kmalloc(attrsize + 1, GFP_KERNEL);
+				if (!ses->domainName)
+						return -ENOMEM;
+				default_nls = load_nls_default();
+				cifs_from_ucs2(ses->domainName,
+					(__le16 *)blobptr, attrsize, attrsize,
+					default_nls, false);
+				unload_nls(default_nls);
+				break;
+			}
+		}
+		blobptr += attrsize; /* advance attr  value */
+	}
+
+	return 0;
+}
+
 static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
 			    const struct nls_table *nls_cp)
 {
@@ -321,7 +406,8 @@ calc_exit_2:
 	return rc;
 }
 
-void setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
+int
+setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
 		      const struct nls_table *nls_cp)
 {
 	int rc;
@@ -333,25 +419,48 @@ void setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
 	buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 	get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
 	buf->reserved2 = 0;
-	buf->names[0].type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
-	buf->names[0].length = 0;
-	buf->names[1].type = 0;
-	buf->names[1].length = 0;
+
+	if (ses->server->secType == RawNTLMSSP) {
+		if (!ses->domainName) {
+			rc = find_domain_name(ses);
+			if (rc) {
+				cERROR(1, "error %d finding domain name", rc);
+				goto setup_ntlmv2_rsp_ret;
+			}
+		}
+	} else {
+		rc = build_avpair_blob(ses);
+		if (rc) {
+			cERROR(1, "error %d building av pair blob", rc);
+			return rc;
+		}
+	}
 
 	/* calculate buf->ntlmv2_hash */
 	rc = calc_ntlmv2_hash(ses, nls_cp);
-	if (rc)
+	if (rc) {
 		cERROR(1, "could not get v2 hash rc %d", rc);
+		goto setup_ntlmv2_rsp_ret;
+	}
 	CalcNTLMv2_response(ses, resp_buf);
 
 	/* now calculate the MAC key for NTLMv2 */
 	hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
 	hmac_md5_update(resp_buf, 16, &context);
-	hmac_md5_final(ses->server->mac_signing_key.data.ntlmv2.key, &context);
+	hmac_md5_final(ses->server->session_key.data.ntlmv2.key, &context);
 
-	memcpy(&ses->server->mac_signing_key.data.ntlmv2.resp, resp_buf,
+	memcpy(&ses->server->session_key.data.ntlmv2.resp, resp_buf,
 	       sizeof(struct ntlmv2_resp));
-	ses->server->mac_signing_key.len = 16 + sizeof(struct ntlmv2_resp);
+	ses->server->session_key.len = 16 + sizeof(struct ntlmv2_resp);
+
+	return 0;
+
+setup_ntlmv2_rsp_ret:
+	kfree(ses->tiblob);
+	ses->tiblob = NULL;
+	ses->tilen = 0;
+
+	return rc;
 }
 
 void CalcNTLMv2_response(const struct cifsSesInfo *ses,
@@ -365,6 +474,9 @@ void CalcNTLMv2_response(const struct cifsSesInfo *ses,
 	hmac_md5_update(v2_session_response+8,
 			sizeof(struct ntlmv2_resp) - 8, &context);
 
+	if (ses->tilen)
+		hmac_md5_update(ses->tiblob, ses->tilen, &context);
+
 	hmac_md5_final(v2_session_response, &context);
 /*	cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
 }

fs/cifs/cifsfs.c

@@ -36,6 +36,7 @@
 #include <linux/kthread.h>
 #include <linux/freezer.h>
 #include <linux/smp_lock.h>
+#include <net/ipv6.h>
 #include "cifsfs.h"
 #include "cifspdu.h"
 #define DECLARE_GLOBALS_HERE
@@ -136,9 +137,6 @@ cifs_read_super(struct super_block *sb, void *data,
 	sb->s_magic = CIFS_MAGIC_NUMBER;
 	sb->s_op = &cifs_super_ops;
 	sb->s_bdi = &cifs_sb->bdi;
-/*	if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
-	    sb->s_blocksize =
-		cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 	sb->s_blocksize = CIFS_MAX_MSGSIZE;
 	sb->s_blocksize_bits = 14;	/* default 2**14 = CIFS_MAX_MSGSIZE */
 	inode = cifs_root_iget(sb, ROOT_I);
@@ -224,7 +222,7 @@ cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
 	struct super_block *sb = dentry->d_sb;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
-	struct cifsTconInfo *tcon = cifs_sb->tcon;
+	struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 	int rc = -EOPNOTSUPP;
 	int xid;
 
@@ -366,14 +364,36 @@ static int
 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 {
 	struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
-	struct cifsTconInfo *tcon = cifs_sb->tcon;
+	struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
+	struct sockaddr *srcaddr;
+	srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 
 	seq_printf(s, ",unc=%s", tcon->treeName);
-	if (tcon->ses->userName)
+
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
+		seq_printf(s, ",multiuser");
+	else if (tcon->ses->userName)
 		seq_printf(s, ",username=%s", tcon->ses->userName);
+
 	if (tcon->ses->domainName)
 		seq_printf(s, ",domain=%s", tcon->ses->domainName);
 
+	if (srcaddr->sa_family != AF_UNSPEC) {
+		struct sockaddr_in *saddr4;
+		struct sockaddr_in6 *saddr6;
+		saddr4 = (struct sockaddr_in *)srcaddr;
+		saddr6 = (struct sockaddr_in6 *)srcaddr;
+		if (srcaddr->sa_family == AF_INET6)
+			seq_printf(s, ",srcaddr=%pI6c",
+				   &saddr6->sin6_addr);
+		else if (srcaddr->sa_family == AF_INET)
+			seq_printf(s, ",srcaddr=%pI4",
+				   &saddr4->sin_addr.s_addr);
+		else
+			seq_printf(s, ",srcaddr=BAD-AF:%i",
+				   (int)(srcaddr->sa_family));
+	}
+
 	seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 		seq_printf(s, ",forceuid");
@@ -422,6 +442,8 @@ cifs_show_options(struct seq_file *s, struct vfsmount *m)
 		seq_printf(s, ",dynperm");
 	if (m->mnt_sb->s_flags & MS_POSIXACL)
 		seq_printf(s, ",acl");
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
+		seq_printf(s, ",mfsymlinks");
 
 	seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 	seq_printf(s, ",wsize=%d", cifs_sb->wsize);
@@ -437,9 +459,7 @@ static void cifs_umount_begin(struct super_block *sb)
 	if (cifs_sb == NULL)
 		return;
 
-	tcon = cifs_sb->tcon;
-	if (tcon == NULL)
-		return;
+	tcon = cifs_sb_master_tcon(cifs_sb);
 
 	read_lock(&cifs_tcp_ses_lock);
 	if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
@@ -568,6 +588,7 @@ static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 	/* note that this is called by vfs setlease with the BKL held
 	   although I doubt that BKL is needed here in cifs */
 	struct inode *inode = file->f_path.dentry->d_inode;
+	struct cifsFileInfo *cfile = file->private_data;
 
 	if (!(S_ISREG(inode->i_mode)))
 		return -EINVAL;
@@ -578,8 +599,8 @@ static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 	    ((arg == F_WRLCK) &&
 		(CIFS_I(inode)->clientCanCacheAll)))
 		return generic_setlease(file, arg, lease);
-	else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
-			!CIFS_I(inode)->clientCanCacheRead)
+	else if (tlink_tcon(cfile->tlink)->local_lease &&
+		 !CIFS_I(inode)->clientCanCacheRead)
 		/* If the server claims to support oplock on this
 		   file, then we still need to check oplock even
 		   if the local_lease mount option is set, but there
@@ -912,11 +933,11 @@ init_cifs(void)
 
 	rc = cifs_fscache_register();
 	if (rc)
-		goto out;
+		goto out_clean_proc;
 
 	rc = cifs_init_inodecache();
 	if (rc)
-		goto out_clean_proc;
+		goto out_unreg_fscache;
 
 	rc = cifs_init_mids();
 	if (rc)
@@ -938,19 +959,19 @@ init_cifs(void)
 	return 0;
 
 #ifdef CONFIG_CIFS_UPCALL
- out_unregister_filesystem:
+out_unregister_filesystem:
 	unregister_filesystem(&cifs_fs_type);
 #endif
- out_destroy_request_bufs:
+out_destroy_request_bufs:
 	cifs_destroy_request_bufs();
- out_destroy_mids:
+out_destroy_mids:
 	cifs_destroy_mids();
- out_destroy_inodecache:
+out_destroy_inodecache:
 	cifs_destroy_inodecache();
- out_clean_proc:
-	cifs_proc_clean();
+out_unreg_fscache:
 	cifs_fscache_unregister();
- out:
+out_clean_proc:
+	cifs_proc_clean();
 	return rc;
 }
 

fs/cifs/cifsfs.h

@@ -104,7 +104,7 @@ extern int cifs_readlink(struct dentry *direntry, char __user *buffer,
 extern int cifs_symlink(struct inode *inode, struct dentry *direntry,
 			const char *symname);
 extern int	cifs_removexattr(struct dentry *, const char *);
-extern int 	cifs_setxattr(struct dentry *, const char *, const void *,
+extern int	cifs_setxattr(struct dentry *, const char *, const void *,
 			size_t, int);
 extern ssize_t	cifs_getxattr(struct dentry *, const char *, void *, size_t);
 extern ssize_t	cifs_listxattr(struct dentry *, char *, size_t);

fs/cifs/cifsglob.h

@@ -97,7 +97,7 @@ enum protocolEnum {
 	/* Netbios frames protocol not supported at this time */
 };
 
-struct mac_key {
+struct session_key {
 	unsigned int len;
 	union {
 		char ntlm[CIFS_SESS_KEY_SIZE + 16];
@@ -139,6 +139,7 @@ struct TCP_Server_Info {
 		struct sockaddr_in sockAddr;
 		struct sockaddr_in6 sockAddr6;
 	} addr;
+	struct sockaddr_storage srcaddr; /* locally bind to this IP */
 	wait_queue_head_t response_q;
 	wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 	struct list_head pending_mid_q;
@@ -182,7 +183,7 @@ struct TCP_Server_Info {
 	/* 16th byte of RFC1001 workstation name is always null */
 	char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 	__u32 sequence_number; /* needed for CIFS PDU signature */
-	struct mac_key mac_signing_key;
+	struct session_key session_key;
 	char ntlmv2_hash[16];
 	unsigned long lstrp; /* when we got last response from this server */
 	u16 dialect; /* dialect index that server chose */
@@ -222,6 +223,8 @@ struct cifsSesInfo {
 	char userName[MAX_USERNAME_SIZE + 1];
 	char *domainName;
 	char *password;
+	unsigned int tilen; /* length of the target info blob */
+	unsigned char *tiblob; /* target info blob in challenge response */
 	bool need_reconnect:1; /* connection reset, uid now invalid */
 };
 /* no more than one of the following three session flags may be set */
@@ -307,6 +310,44 @@ struct cifsTconInfo {
 	/* BB add field for back pointer to sb struct(s)? */
 };
 
+/*
+ * This is a refcounted and timestamped container for a tcon pointer. The
+ * container holds a tcon reference. It is considered safe to free one of
+ * these when the tl_count goes to 0. The tl_time is the time of the last
+ * "get" on the container.
+ */
+struct tcon_link {
+	unsigned long		tl_index;
+	unsigned long		tl_flags;
+#define TCON_LINK_MASTER	0
+#define TCON_LINK_PENDING	1
+#define TCON_LINK_IN_TREE	2
+	unsigned long		tl_time;
+	atomic_t		tl_count;
+	struct cifsTconInfo	*tl_tcon;
+};
+
+extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
+
+static inline struct cifsTconInfo *
+tlink_tcon(struct tcon_link *tlink)
+{
+	return tlink->tl_tcon;
+}
+
+extern void cifs_put_tlink(struct tcon_link *tlink);
+
+static inline struct tcon_link *
+cifs_get_tlink(struct tcon_link *tlink)
+{
+	if (tlink && !IS_ERR(tlink))
+		atomic_inc(&tlink->tl_count);
+	return tlink;
+}
+
+/* This function is always expected to succeed */
+extern struct cifsTconInfo *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
+
 /*
  * This info hangs off the cifsFileInfo structure, pointed to by llist.
  * This is used to track byte stream locks on the file
@@ -348,6 +389,7 @@ struct cifsFileInfo {
 	struct file *pfile; /* needed for writepage */
 	struct inode *pInode; /* needed for oplock break */
 	struct vfsmount *mnt;
+	struct tcon_link *tlink;
 	struct mutex lock_mutex;
 	struct list_head llist; /* list of byte range locks we have. */
 	bool closePend:1;	/* file is marked to close */
@@ -369,6 +411,7 @@ static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
 static inline void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
 {
 	if (atomic_dec_and_test(&cifs_file->count)) {
+		cifs_put_tlink(cifs_file->tlink);
 		iput(cifs_file->pInode);
 		kfree(cifs_file);
 	}
@@ -474,16 +517,16 @@ struct oplock_q_entry {
 
 /* for pending dnotify requests */
 struct dir_notify_req {
-       struct list_head lhead;
-       __le16 Pid;
-       __le16 PidHigh;
-       __u16 Mid;
-       __u16 Tid;
-       __u16 Uid;
-       __u16 netfid;
-       __u32 filter; /* CompletionFilter (for multishot) */
-       int multishot;
-       struct file *pfile;
+	struct list_head lhead;
+	__le16 Pid;
+	__le16 PidHigh;
+	__u16 Mid;
+	__u16 Tid;
+	__u16 Uid;
+	__u16 netfid;
+	__u32 filter; /* CompletionFilter (for multishot) */
+	int multishot;
+	struct file *pfile;
 };
 
 struct dfs_info3_param {

fs/cifs/cifspdu.h

@@ -663,7 +663,6 @@ struct ntlmv2_resp {
 	__le64  time;
 	__u64  client_chal; /* random */
 	__u32  reserved2;
-	struct ntlmssp2_name names[2];
 	/* array of name entries could follow ending in minimum 4 byte struct */
 } __attribute__((packed));
 

fs/cifs/cifsproto.h

@@ -78,9 +78,9 @@ extern int checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length);
 extern bool is_valid_oplock_break(struct smb_hdr *smb,
 				  struct TCP_Server_Info *);
 extern bool is_size_safe_to_change(struct cifsInodeInfo *, __u64 eof);
-extern struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *);
+extern struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *, bool);
 #ifdef CONFIG_CIFS_EXPERIMENTAL
-extern struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *);
+extern struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *, bool);
 #endif
 extern unsigned int smbCalcSize(struct smb_hdr *ptr);
 extern unsigned int smbCalcSize_LE(struct smb_hdr *ptr);
@@ -107,7 +107,8 @@ extern struct timespec cnvrtDosUnixTm(__le16 le_date, __le16 le_time,
 
 extern struct cifsFileInfo *cifs_new_fileinfo(struct inode *newinode,
 				__u16 fileHandle, struct file *file,
-				struct vfsmount *mnt, unsigned int oflags);
+				struct vfsmount *mnt, struct tcon_link *tlink,
+				unsigned int oflags, __u32 oplock);
 extern int cifs_posix_open(char *full_path, struct inode **pinode,
 				struct super_block *sb,
 				int mode, int oflags,
@@ -362,12 +363,12 @@ extern int cifs_sign_smb(struct smb_hdr *, struct TCP_Server_Info *, __u32 *);
 extern int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *,
 			  __u32 *);
 extern int cifs_verify_signature(struct smb_hdr *,
-				 const struct mac_key *mac_key,
+				 const struct session_key *session_key,
 				__u32 expected_sequence_number);
-extern int cifs_calculate_mac_key(struct mac_key *key, const char *rn,
+extern int cifs_calculate_session_key(struct session_key *key, const char *rn,
 				 const char *pass);
 extern void CalcNTLMv2_response(const struct cifsSesInfo *, char *);
-extern void setup_ntlmv2_rsp(struct cifsSesInfo *, char *,
+extern int setup_ntlmv2_rsp(struct cifsSesInfo *, char *,
 			     const struct nls_table *);
 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 extern void calc_lanman_hash(const char *password, const char *cryptkey,
@@ -408,4 +409,8 @@ extern int CIFSSMBSetPosixACL(const int xid, struct cifsTconInfo *tcon,
 extern int CIFSGetExtAttr(const int xid, struct cifsTconInfo *tcon,
 			const int netfid, __u64 *pExtAttrBits, __u64 *pMask);
 extern void cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb);
+extern bool CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr);
+extern int CIFSCheckMFSymlink(struct cifs_fattr *fattr,
+		const unsigned char *path,
+		struct cifs_sb_info *cifs_sb, int xid);
 #endif			/* _CIFSPROTO_H */

fs/cifs/cifssmb.c

@@ -620,13 +620,15 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
 				rc = 0;
 			else
 				rc = -EINVAL;
-
-			if (server->sec_kerberos || server->sec_mskerberos)
-				server->secType = Kerberos;
-			else if (server->sec_ntlmssp)
-				server->secType = RawNTLMSSP;
-			else
-				rc = -EOPNOTSUPP;
+			if (server->secType == Kerberos) {
+				if (!server->sec_kerberos &&
+						!server->sec_mskerberos)
+					rc = -EOPNOTSUPP;
+			} else if (server->secType == RawNTLMSSP) {
+				if (!server->sec_ntlmssp)
+					rc = -EOPNOTSUPP;
+			} else
+					rc = -EOPNOTSUPP;
 		}
 	} else
 		server->capabilities &= ~CAP_EXTENDED_SECURITY;

fs/cifs/cn_cifs.h

@@ -1,37 +0,0 @@
-/*
- *   fs/cifs/cn_cifs.h
- *
- *   Copyright (c) International Business Machines  Corp., 2002
- *   Author(s): Steve French (sfrench@us.ibm.com)
- *
- *   This library is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU Lesser General Public License as published
- *   by the Free Software Foundation; either version 2.1 of the License, or
- *   (at your option) any later version.
- *
- *   This library is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
- *   the GNU Lesser General Public License for more details.
- *
- *   You should have received a copy of the GNU Lesser General Public License
- *   along with this library; if not, write to the Free Software
- *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#ifndef _CN_CIFS_H
-#define _CN_CIFS_H
-#ifdef CONFIG_CIFS_UPCALL
-#include <linux/types.h>
-#include <linux/connector.h>
-
-struct cifs_upcall {
-	char signature[4]; /* CIFS */
-	enum command {
-		CIFS_GET_IP = 0x00000001,   /* get ip address for hostname */
-		CIFS_GET_SECBLOB = 0x00000002, /* get SPNEGO wrapped blob */
-	} command;
-	/* union cifs upcall data follows */
-};
-#endif /* CIFS_UPCALL */
-#endif /* _CN_CIFS_H */

fs/cifs/connect.c

@@ -47,7 +47,6 @@
 #include "ntlmssp.h"
 #include "nterr.h"
 #include "rfc1002pdu.h"
-#include "cn_cifs.h"
 #include "fscache.h"
 
 #define CIFS_PORT 445
@@ -100,16 +99,24 @@ struct smb_vol {
 	bool noautotune:1;
 	bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
 	bool fsc:1;	/* enable fscache */
+	bool mfsymlinks:1; /* use Minshall+French Symlinks */
+	bool multiuser:1;
 	unsigned int rsize;
 	unsigned int wsize;
 	bool sockopt_tcp_nodelay:1;
 	unsigned short int port;
 	char *prepath;
+	struct sockaddr_storage srcaddr; /* allow binding to a local IP */
 	struct nls_table *local_nls;
 };
 
+/* FIXME: should these be tunable? */
+#define TLINK_ERROR_EXPIRE	(1 * HZ)
+#define TLINK_IDLE_EXPIRE	(600 * HZ)
+
 static int ipv4_connect(struct TCP_Server_Info *server);
 static int ipv6_connect(struct TCP_Server_Info *server);
+static void cifs_prune_tlinks(struct work_struct *work);
 
 /*
  * cifs tcp session reconnection
@@ -1046,6 +1053,22 @@ cifs_parse_mount_options(char *options, const char *devname,
 						    "long\n");
 				return 1;
 			}
+		} else if (strnicmp(data, "srcaddr", 7) == 0) {
+			vol->srcaddr.ss_family = AF_UNSPEC;
+
+			if (!value || !*value) {
+				printk(KERN_WARNING "CIFS: srcaddr value"
+				       " not specified.\n");
+				return 1;	/* needs_arg; */
+			}
+			i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
+						 value, strlen(value));
+			if (i < 0) {
+				printk(KERN_WARNING "CIFS:  Could not parse"
+				       " srcaddr: %s\n",
+				       value);
+				return 1;
+			}
 		} else if (strnicmp(data, "prefixpath", 10) == 0) {
 			if (!value || !*value) {
 				printk(KERN_WARNING
@@ -1325,6 +1348,10 @@ cifs_parse_mount_options(char *options, const char *devname,
 				"/proc/fs/cifs/LookupCacheEnabled to 0\n");
 		} else if (strnicmp(data, "fsc", 3) == 0) {
 			vol->fsc = true;
+		} else if (strnicmp(data, "mfsymlinks", 10) == 0) {
+			vol->mfsymlinks = true;
+		} else if (strnicmp(data, "multiuser", 8) == 0) {
+			vol->multiuser = true;
 		} else
 			printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
 						data);
@@ -1356,6 +1383,13 @@ cifs_parse_mount_options(char *options, const char *devname,
 			return 1;
 		}
 	}
+
+	if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
+		cERROR(1, "Multiuser mounts currently require krb5 "
+			  "authentication!");
+		return 1;
+	}
+
 	if (vol->UNCip == NULL)
 		vol->UNCip = &vol->UNC[2];
 
@@ -1374,8 +1408,36 @@ cifs_parse_mount_options(char *options, const char *devname,
 	return 0;
 }
 
+/** Returns true if srcaddr isn't specified and rhs isn't
+ * specified, or if srcaddr is specified and
+ * matches the IP address of the rhs argument.
+ */
 static bool
-match_address(struct TCP_Server_Info *server, struct sockaddr *addr)
+srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
+{
+	switch (srcaddr->sa_family) {
+	case AF_UNSPEC:
+		return (rhs->sa_family == AF_UNSPEC);
+	case AF_INET: {
+		struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
+		struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
+		return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
+	}
+	case AF_INET6: {
+		struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
+		struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
+		return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
+	}
+	default:
+		WARN_ON(1);
+		return false; /* don't expect to be here */
+	}
+}
+
+
+static bool
+match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
+	      struct sockaddr *srcaddr)
 {
 	struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
 	struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
@@ -1402,6 +1464,9 @@ match_address(struct TCP_Server_Info *server, struct sockaddr *addr)
 		break;
 	}
 
+	if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
+		return false;
+
 	return true;
 }
 
@@ -1460,16 +1525,8 @@ cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
 
 	write_lock(&cifs_tcp_ses_lock);
 	list_for_each_entry(server, &cifs_tcp_ses_list, 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 (!match_address(server, addr))
+		if (!match_address(server, addr,
+				   (struct sockaddr *)&vol->srcaddr))
 			continue;
 
 		if (!match_security(server, vol))
@@ -1584,6 +1641,8 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
 	 * no need to spinlock this init of tcpStatus or srv_count
 	 */
 	tcp_ses->tcpStatus = CifsNew;
+	memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
+	       sizeof(tcp_ses->srcaddr));
 	++tcp_ses->srv_count;
 
 	if (addr.ss_family == AF_INET6) {
@@ -1740,6 +1799,8 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
 	if (ses == NULL)
 		goto get_ses_fail;
 
+	ses->tilen = 0;
+	ses->tiblob = NULL;
 	/* new SMB session uses our server ref */
 	ses->server = server;
 	if (server->addr.sockAddr6.sin6_family == AF_INET6)
@@ -1913,6 +1974,23 @@ out_fail:
 	return ERR_PTR(rc);
 }
 
+void
+cifs_put_tlink(struct tcon_link *tlink)
+{
+	if (!tlink || IS_ERR(tlink))
+		return;
+
+	if (!atomic_dec_and_test(&tlink->tl_count) ||
+	    test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
+		tlink->tl_time = jiffies;
+		return;
+	}
+
+	if (!IS_ERR(tlink_tcon(tlink)))
+		cifs_put_tcon(tlink_tcon(tlink));
+	kfree(tlink);
+	return;
+}
 
 int
 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
@@ -1997,6 +2075,33 @@ static void rfc1002mangle(char *target, char *source, unsigned int length)
 
 }
 
+static int
+bind_socket(struct TCP_Server_Info *server)
+{
+	int rc = 0;
+	if (server->srcaddr.ss_family != AF_UNSPEC) {
+		/* Bind to the specified local IP address */
+		struct socket *socket = server->ssocket;
+		rc = socket->ops->bind(socket,
+				       (struct sockaddr *) &server->srcaddr,
+				       sizeof(server->srcaddr));
+		if (rc < 0) {
+			struct sockaddr_in *saddr4;
+			struct sockaddr_in6 *saddr6;
+			saddr4 = (struct sockaddr_in *)&server->srcaddr;
+			saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
+			if (saddr6->sin6_family == AF_INET6)
+				cERROR(1, "cifs: "
+				       "Failed to bind to: %pI6c, error: %d\n",
+				       &saddr6->sin6_addr, rc);
+			else
+				cERROR(1, "cifs: "
+				       "Failed to bind to: %pI4, error: %d\n",
+				       &saddr4->sin_addr.s_addr, rc);
+		}
+	}
+	return rc;
+}
 
 static int
 ipv4_connect(struct TCP_Server_Info *server)
@@ -2022,6 +2127,10 @@ ipv4_connect(struct TCP_Server_Info *server)
 		cifs_reclassify_socket4(socket);
 	}
 
+	rc = bind_socket(server);
+	if (rc < 0)
+		return rc;
+
 	/* user overrode default port */
 	if (server->addr.sockAddr.sin_port) {
 		rc = socket->ops->connect(socket, (struct sockaddr *)
@@ -2184,6 +2293,10 @@ ipv6_connect(struct TCP_Server_Info *server)
 		cifs_reclassify_socket6(socket);
 	}
 
+	rc = bind_socket(server);
+	if (rc < 0)
+		return rc;
+
 	/* user overrode default port */
 	if (server->addr.sockAddr6.sin6_port) {
 		rc = socket->ops->connect(socket,
@@ -2383,6 +2496,8 @@ convert_delimiter(char *path, char delim)
 static void setup_cifs_sb(struct smb_vol *pvolume_info,
 			  struct cifs_sb_info *cifs_sb)
 {
+	INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
+
 	if (pvolume_info->rsize > CIFSMaxBufSize) {
 		cERROR(1, "rsize %d too large, using MaxBufSize",
 			pvolume_info->rsize);
@@ -2462,10 +2577,21 @@ static void setup_cifs_sb(struct smb_vol *pvolume_info,
 		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
 	if (pvolume_info->fsc)
 		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
+	if (pvolume_info->multiuser)
+		cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
+					    CIFS_MOUNT_NO_PERM);
 	if (pvolume_info->direct_io) {
 		cFYI(1, "mounting share using direct i/o");
 		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
 	}
+	if (pvolume_info->mfsymlinks) {
+		if (pvolume_info->sfu_emul) {
+			cERROR(1,  "mount option mfsymlinks ignored if sfu "
+				   "mount option is used");
+		} else {
+			cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
+		}
+	}
 
 	if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
 		cERROR(1, "mount option dynperm ignored if cifsacl "
@@ -2552,6 +2678,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 	struct TCP_Server_Info *srvTcp;
 	char   *full_path;
 	char *mount_data = mount_data_global;
+	struct tcon_link *tlink;
 #ifdef CONFIG_CIFS_DFS_UPCALL
 	struct dfs_info3_param *referrals = NULL;
 	unsigned int num_referrals = 0;
@@ -2563,6 +2690,7 @@ try_mount_again:
 	pSesInfo = NULL;
 	srvTcp = NULL;
 	full_path = NULL;
+	tlink = NULL;
 
 	xid = GetXid();
 
@@ -2638,8 +2766,6 @@ try_mount_again:
 		goto remote_path_check;
 	}
 
-	cifs_sb->tcon = tcon;
-
 	/* do not care if following two calls succeed - informational */
 	if (!tcon->ipc) {
 		CIFSSMBQFSDeviceInfo(xid, tcon);
@@ -2748,6 +2874,38 @@ remote_path_check:
 #endif
 	}
 
+	if (rc)
+		goto mount_fail_check;
+
+	/* now, hang the tcon off of the superblock */
+	tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
+	if (tlink == NULL) {
+		rc = -ENOMEM;
+		goto mount_fail_check;
+	}
+
+	tlink->tl_index = pSesInfo->linux_uid;
+	tlink->tl_tcon = tcon;
+	tlink->tl_time = jiffies;
+	set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
+	set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
+
+	rc = radix_tree_preload(GFP_KERNEL);
+	if (rc == -ENOMEM) {
+		kfree(tlink);
+		goto mount_fail_check;
+	}
+
+	spin_lock(&cifs_sb->tlink_tree_lock);
+	radix_tree_insert(&cifs_sb->tlink_tree, pSesInfo->linux_uid, tlink);
+	radix_tree_tag_set(&cifs_sb->tlink_tree, pSesInfo->linux_uid,
+			   CIFS_TLINK_MASTER_TAG);
+	spin_unlock(&cifs_sb->tlink_tree_lock);
+	radix_tree_preload_end();
+
+	queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
+				TLINK_IDLE_EXPIRE);
+
 mount_fail_check:
 	/* on error free sesinfo and tcon struct if needed */
 	if (rc) {
@@ -2934,19 +3092,39 @@ CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
 int
 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
 {
-	int rc = 0;
+	int i, ret;
 	char *tmp;
+	struct tcon_link *tlink[8];
+	unsigned long index = 0;
+
+	cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
+
+	do {
+		spin_lock(&cifs_sb->tlink_tree_lock);
+		ret = radix_tree_gang_lookup(&cifs_sb->tlink_tree,
+					     (void **)tlink, index,
+					     ARRAY_SIZE(tlink));
+		/* increment index for next pass */
+		if (ret > 0)
+			index = tlink[ret - 1]->tl_index + 1;
+		for (i = 0; i < ret; i++) {
+			cifs_get_tlink(tlink[i]);
+			clear_bit(TCON_LINK_IN_TREE, &tlink[i]->tl_flags);
+			radix_tree_delete(&cifs_sb->tlink_tree,
+							tlink[i]->tl_index);
+		}
+		spin_unlock(&cifs_sb->tlink_tree_lock);
 
-	if (cifs_sb->tcon)
-		cifs_put_tcon(cifs_sb->tcon);
+		for (i = 0; i < ret; i++)
+			cifs_put_tlink(tlink[i]);
+	} while (ret != 0);
 
-	cifs_sb->tcon = NULL;
 	tmp = cifs_sb->prepath;
 	cifs_sb->prepathlen = 0;
 	cifs_sb->prepath = NULL;
 	kfree(tmp);
 
-	return rc;
+	return 0;
 }
 
 int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
@@ -3007,3 +3185,237 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
 	return rc;
 }
 
+static struct cifsTconInfo *
+cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
+{
+	struct cifsTconInfo *master_tcon = cifs_sb_master_tcon(cifs_sb);
+	struct cifsSesInfo *ses;
+	struct cifsTconInfo *tcon = NULL;
+	struct smb_vol *vol_info;
+	char username[MAX_USERNAME_SIZE + 1];
+
+	vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
+	if (vol_info == NULL) {
+		tcon = ERR_PTR(-ENOMEM);
+		goto out;
+	}
+
+	snprintf(username, MAX_USERNAME_SIZE, "krb50x%x", fsuid);
+	vol_info->username = username;
+	vol_info->local_nls = cifs_sb->local_nls;
+	vol_info->linux_uid = fsuid;
+	vol_info->cred_uid = fsuid;
+	vol_info->UNC = master_tcon->treeName;
+	vol_info->retry = master_tcon->retry;
+	vol_info->nocase = master_tcon->nocase;
+	vol_info->local_lease = master_tcon->local_lease;
+	vol_info->no_linux_ext = !master_tcon->unix_ext;
+
+	/* FIXME: allow for other secFlg settings */
+	vol_info->secFlg = CIFSSEC_MUST_KRB5;
+
+	/* get a reference for the same TCP session */
+	write_lock(&cifs_tcp_ses_lock);
+	++master_tcon->ses->server->srv_count;
+	write_unlock(&cifs_tcp_ses_lock);
+
+	ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
+	if (IS_ERR(ses)) {
+		tcon = (struct cifsTconInfo *)ses;
+		cifs_put_tcp_session(master_tcon->ses->server);
+		goto out;
+	}
+
+	tcon = cifs_get_tcon(ses, vol_info);
+	if (IS_ERR(tcon)) {
+		cifs_put_smb_ses(ses);
+		goto out;
+	}
+
+	if (ses->capabilities & CAP_UNIX)
+		reset_cifs_unix_caps(0, tcon, NULL, vol_info);
+out:
+	kfree(vol_info);
+
+	return tcon;
+}
+
+static struct tcon_link *
+cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
+{
+	struct tcon_link *tlink;
+	unsigned int ret;
+
+	spin_lock(&cifs_sb->tlink_tree_lock);
+	ret = radix_tree_gang_lookup_tag(&cifs_sb->tlink_tree, (void **)&tlink,
+					0, 1, CIFS_TLINK_MASTER_TAG);
+	spin_unlock(&cifs_sb->tlink_tree_lock);
+
+	/* the master tcon should always be present */
+	if (ret == 0)
+		BUG();
+
+	return tlink;
+}
+
+struct cifsTconInfo *
+cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
+{
+	return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
+}
+
+static int
+cifs_sb_tcon_pending_wait(void *unused)
+{
+	schedule();
+	return signal_pending(current) ? -ERESTARTSYS : 0;
+}
+
+/*
+ * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
+ * current task.
+ *
+ * If the superblock doesn't refer to a multiuser mount, then just return
+ * the master tcon for the mount.
+ *
+ * First, search the radix tree for an existing tcon for this fsuid. If one
+ * exists, then check to see if it's pending construction. If it is then wait
+ * for construction to complete. Once it's no longer pending, check to see if
+ * it failed and either return an error or retry construction, depending on
+ * the timeout.
+ *
+ * If one doesn't exist then insert a new tcon_link struct into the tree and
+ * try to construct a new one.
+ */
+struct tcon_link *
+cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
+{
+	int ret;
+	unsigned long fsuid = (unsigned long) current_fsuid();
+	struct tcon_link *tlink, *newtlink;
+
+	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
+		return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
+
+	spin_lock(&cifs_sb->tlink_tree_lock);
+	tlink = radix_tree_lookup(&cifs_sb->tlink_tree, fsuid);
+	if (tlink)
+		cifs_get_tlink(tlink);
+	spin_unlock(&cifs_sb->tlink_tree_lock);
+
+	if (tlink == NULL) {
+		newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
+		if (newtlink == NULL)
+			return ERR_PTR(-ENOMEM);
+		newtlink->tl_index = fsuid;
+		newtlink->tl_tcon = ERR_PTR(-EACCES);
+		set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
+		set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
+		cifs_get_tlink(newtlink);
+
+		ret = radix_tree_preload(GFP_KERNEL);
+		if (ret != 0) {
+			kfree(newtlink);
+			return ERR_PTR(ret);
+		}
+
+		spin_lock(&cifs_sb->tlink_tree_lock);
+		/* was one inserted after previous search? */
+		tlink = radix_tree_lookup(&cifs_sb->tlink_tree, fsuid);
+		if (tlink) {
+			cifs_get_tlink(tlink);
+			spin_unlock(&cifs_sb->tlink_tree_lock);
+			radix_tree_preload_end();
+			kfree(newtlink);
+			goto wait_for_construction;
+		}
+		ret = radix_tree_insert(&cifs_sb->tlink_tree, fsuid, newtlink);
+		spin_unlock(&cifs_sb->tlink_tree_lock);
+		radix_tree_preload_end();
+		if (ret) {
+			kfree(newtlink);
+			return ERR_PTR(ret);
+		}
+		tlink = newtlink;
+	} else {
+wait_for_construction:
+		ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
+				  cifs_sb_tcon_pending_wait,
+				  TASK_INTERRUPTIBLE);
+		if (ret) {
+			cifs_put_tlink(tlink);
+			return ERR_PTR(ret);
+		}
+
+		/* if it's good, return it */
+		if (!IS_ERR(tlink->tl_tcon))
+			return tlink;
+
+		/* return error if we tried this already recently */
+		if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
+			cifs_put_tlink(tlink);
+			return ERR_PTR(-EACCES);
+		}
+
+		if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
+			goto wait_for_construction;
+	}
+
+	tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
+	clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
+	wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
+
+	if (IS_ERR(tlink->tl_tcon)) {
+		cifs_put_tlink(tlink);
+		return ERR_PTR(-EACCES);
+	}
+
+	return tlink;
+}
+
+/*
+ * periodic workqueue job that scans tcon_tree for a superblock and closes
+ * out tcons.
+ */
+static void
+cifs_prune_tlinks(struct work_struct *work)
+{
+	struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
+						    prune_tlinks.work);
+	struct tcon_link *tlink[8];
+	unsigned long now = jiffies;
+	unsigned long index = 0;
+	int i, ret;
+
+	do {
+		spin_lock(&cifs_sb->tlink_tree_lock);
+		ret = radix_tree_gang_lookup(&cifs_sb->tlink_tree,
+					     (void **)tlink, index,
+					     ARRAY_SIZE(tlink));
+		/* increment index for next pass */
+		if (ret > 0)
+			index = tlink[ret - 1]->tl_index + 1;
+		for (i = 0; i < ret; i++) {
+			if (test_bit(TCON_LINK_MASTER, &tlink[i]->tl_flags) ||
+			    atomic_read(&tlink[i]->tl_count) != 0 ||
+			    time_after(tlink[i]->tl_time + TLINK_IDLE_EXPIRE,
+				       now)) {
+				tlink[i] = NULL;
+				continue;
+			}
+			cifs_get_tlink(tlink[i]);
+			clear_bit(TCON_LINK_IN_TREE, &tlink[i]->tl_flags);
+			radix_tree_delete(&cifs_sb->tlink_tree,
+					  tlink[i]->tl_index);
+		}
+		spin_unlock(&cifs_sb->tlink_tree_lock);
+
+		for (i = 0; i < ret; i++) {
+			if (tlink[i] != NULL)
+				cifs_put_tlink(tlink[i]);
+		}
+	} while (ret != 0);
+
+	queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
+				TLINK_IDLE_EXPIRE);
+}

fs/cifs/dir.c

@@ -54,18 +54,18 @@ build_path_from_dentry(struct dentry *direntry)
 	int dfsplen;
 	char *full_path;
 	char dirsep;
-	struct cifs_sb_info *cifs_sb;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
+	struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 
 	if (direntry == NULL)
 		return NULL;  /* not much we can do if dentry is freed and
 		we need to reopen the file after it was closed implicitly
 		when the server crashed */
 
-	cifs_sb = CIFS_SB(direntry->d_sb);
 	dirsep = CIFS_DIR_SEP(cifs_sb);
 	pplen = cifs_sb->prepathlen;
-	if (cifs_sb->tcon && (cifs_sb->tcon->Flags & SMB_SHARE_IS_IN_DFS))
-		dfsplen = strnlen(cifs_sb->tcon->treeName, MAX_TREE_SIZE + 1);
+	if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
+		dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
 	else
 		dfsplen = 0;
 cifs_bp_rename_retry:
@@ -117,7 +117,7 @@ cifs_bp_rename_retry:
 	/* BB test paths to Windows with '/' in the midst of prepath */
 
 	if (dfsplen) {
-		strncpy(full_path, cifs_sb->tcon->treeName, dfsplen);
+		strncpy(full_path, tcon->treeName, dfsplen);
 		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
 			int i;
 			for (i = 0; i < dfsplen; i++) {
@@ -131,28 +131,26 @@ cifs_bp_rename_retry:
 }
 
 struct cifsFileInfo *
-cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle,
-		  struct file *file, struct vfsmount *mnt, unsigned int oflags)
+cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle, struct file *file,
+		  struct vfsmount *mnt, struct tcon_link *tlink,
+		  unsigned int oflags, __u32 oplock)
 {
-	int oplock = 0;
 	struct cifsFileInfo *pCifsFile;
 	struct cifsInodeInfo *pCifsInode;
-	struct cifs_sb_info *cifs_sb = CIFS_SB(mnt->mnt_sb);
 
 	pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
 	if (pCifsFile == NULL)
 		return pCifsFile;
 
-	if (oplockEnabled)
-		oplock = REQ_OPLOCK;
-
 	pCifsFile->netfid = fileHandle;
 	pCifsFile->pid = current->tgid;
+	pCifsFile->uid = current_fsuid();
 	pCifsFile->pInode = igrab(newinode);
 	pCifsFile->mnt = mnt;
 	pCifsFile->pfile = file;
 	pCifsFile->invalidHandle = false;
 	pCifsFile->closePend = false;
+	pCifsFile->tlink = cifs_get_tlink(tlink);
 	mutex_init(&pCifsFile->fh_mutex);
 	mutex_init(&pCifsFile->lock_mutex);
 	INIT_LIST_HEAD(&pCifsFile->llist);
@@ -160,7 +158,7 @@ cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle,
 	INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break);
 
 	write_lock(&GlobalSMBSeslock);
-	list_add(&pCifsFile->tlist, &cifs_sb->tcon->openFileList);
+	list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList));
 	pCifsInode = CIFS_I(newinode);
 	if (pCifsInode) {
 		/* if readable file instance put first in list*/
@@ -193,6 +191,8 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
 	__u32 posix_flags = 0;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 	struct cifs_fattr fattr;
+	struct tcon_link *tlink;
+	struct cifsTconInfo *tcon;
 
 	cFYI(1, "posix open %s", full_path);
 
@@ -227,10 +227,20 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
 		posix_flags |= SMB_O_DIRECT;
 
 	mode &= ~current_umask();
-	rc = CIFSPOSIXCreate(xid, cifs_sb->tcon, posix_flags, mode,
-			pnetfid, presp_data, poplock, full_path,
-			cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
+
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink)) {
+		rc = PTR_ERR(tlink);
+		goto posix_open_ret;
+	}
+
+	tcon = tlink_tcon(tlink);
+	rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
+			     poplock, full_path, cifs_sb->local_nls,
+			     cifs_sb->mnt_cifs_flags &
 					CIFS_MOUNT_MAP_SPECIAL_CHR);
+	cifs_put_tlink(tlink);
+
 	if (rc)
 		goto posix_open_ret;
 
@@ -291,6 +301,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
 	int desiredAccess = GENERIC_READ | GENERIC_WRITE;
 	__u16 fileHandle;
 	struct cifs_sb_info *cifs_sb;
+	struct tcon_link *tlink;
 	struct cifsTconInfo *tcon;
 	char *full_path = NULL;
 	FILE_ALL_INFO *buf = NULL;
@@ -300,13 +311,12 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
 	xid = GetXid();
 
 	cifs_sb = CIFS_SB(inode->i_sb);
-	tcon = cifs_sb->tcon;
-
-	full_path = build_path_from_dentry(direntry);
-	if (full_path == NULL) {
-		rc = -ENOMEM;
-		goto cifs_create_out;
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink)) {
+		FreeXid(xid);
+		return PTR_ERR(tlink);
 	}
+	tcon = tlink_tcon(tlink);
 
 	if (oplockEnabled)
 		oplock = REQ_OPLOCK;
@@ -316,6 +326,12 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
 	else
 		oflags = FMODE_READ | SMB_O_CREAT;
 
+	full_path = build_path_from_dentry(direntry);
+	if (full_path == NULL) {
+		rc = -ENOMEM;
+		goto cifs_create_out;
+	}
+
 	if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
 	    (CIFS_UNIX_POSIX_PATH_OPS_CAP &
 			le64_to_cpu(tcon->fsUnixInfo.Capability))) {
@@ -375,7 +391,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
 	if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
 		create_options |= CREATE_OPTION_READONLY;
 
-	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
+	if (tcon->ses->capabilities & CAP_NT_SMBS)
 		rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
 			 desiredAccess, create_options,
 			 &fileHandle, &oplock, buf, cifs_sb->local_nls,
@@ -468,7 +484,8 @@ cifs_create_set_dentry:
 		}
 
 		pfile_info = cifs_new_fileinfo(newinode, fileHandle, filp,
-					       nd->path.mnt, oflags);
+						nd->path.mnt, tlink, oflags,
+						oplock);
 		if (pfile_info == NULL) {
 			fput(filp);
 			CIFSSMBClose(xid, tcon, fileHandle);
@@ -481,6 +498,7 @@ cifs_create_set_dentry:
 cifs_create_out:
 	kfree(buf);
 	kfree(full_path);
+	cifs_put_tlink(tlink);
 	FreeXid(xid);
 	return rc;
 }
@@ -491,6 +509,7 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
 	int rc = -EPERM;
 	int xid;
 	struct cifs_sb_info *cifs_sb;
+	struct tcon_link *tlink;
 	struct cifsTconInfo *pTcon;
 	char *full_path = NULL;
 	struct inode *newinode = NULL;
@@ -503,10 +522,14 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
 	if (!old_valid_dev(device_number))
 		return -EINVAL;
 
-	xid = GetXid();
-
 	cifs_sb = CIFS_SB(inode->i_sb);
-	pTcon = cifs_sb->tcon;
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+
+	pTcon = tlink_tcon(tlink);
+
+	xid = GetXid();
 
 	full_path = build_path_from_dentry(direntry);
 	if (full_path == NULL) {
@@ -606,6 +629,7 @@ mknod_out:
 	kfree(full_path);
 	kfree(buf);
 	FreeXid(xid);
+	cifs_put_tlink(tlink);
 	return rc;
 }
 
@@ -619,6 +643,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 	__u16 fileHandle = 0;
 	bool posix_open = false;
 	struct cifs_sb_info *cifs_sb;
+	struct tcon_link *tlink;
 	struct cifsTconInfo *pTcon;
 	struct cifsFileInfo *cfile;
 	struct inode *newInode = NULL;
@@ -633,7 +658,12 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 	/* check whether path exists */
 
 	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
-	pTcon = cifs_sb->tcon;
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink)) {
+		FreeXid(xid);
+		return (struct dentry *)tlink;
+	}
+	pTcon = tlink_tcon(tlink);
 
 	/*
 	 * Don't allow the separator character in a path component.
@@ -644,8 +674,8 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 		for (i = 0; i < direntry->d_name.len; i++)
 			if (direntry->d_name.name[i] == '\\') {
 				cFYI(1, "Invalid file name");
-				FreeXid(xid);
-				return ERR_PTR(-EINVAL);
+				rc = -EINVAL;
+				goto lookup_out;
 			}
 	}
 
@@ -655,7 +685,8 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 	 */
 	if (nd && (nd->flags & LOOKUP_EXCL)) {
 		d_instantiate(direntry, NULL);
-		return NULL;
+		rc = 0;
+		goto lookup_out;
 	}
 
 	/* can not grab the rename sem here since it would
@@ -663,8 +694,8 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 	in which we already have the sb rename sem */
 	full_path = build_path_from_dentry(direntry);
 	if (full_path == NULL) {
-		FreeXid(xid);
-		return ERR_PTR(-ENOMEM);
+		rc = -ENOMEM;
+		goto lookup_out;
 	}
 
 	if (direntry->d_inode != NULL) {
@@ -728,8 +759,9 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 			}
 
 			cfile = cifs_new_fileinfo(newInode, fileHandle, filp,
-						  nd->path.mnt,
-						  nd->intent.open.flags);
+						  nd->path.mnt, tlink,
+						  nd->intent.open.flags,
+						  oplock);
 			if (cfile == NULL) {
 				fput(filp);
 				CIFSSMBClose(xid, pTcon, fileHandle);
@@ -759,6 +791,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 
 lookup_out:
 	kfree(full_path);
+	cifs_put_tlink(tlink);
 	FreeXid(xid);
 	return ERR_PTR(rc);
 }

fs/cifs/file.c

@@ -165,7 +165,7 @@ psx_client_can_cache:
 
 /* all arguments to this function must be checked for validity in caller */
 static inline int cifs_open_inode_helper(struct inode *inode,
-	struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf,
+	struct cifsTconInfo *pTcon, __u32 oplock, FILE_ALL_INFO *buf,
 	char *full_path, int xid)
 {
 	struct cifsInodeInfo *pCifsInode = CIFS_I(inode);
@@ -207,11 +207,11 @@ client_can_cache:
 		rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
 					 xid, NULL);
 
-	if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) {
+	if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
 		pCifsInode->clientCanCacheAll = true;
 		pCifsInode->clientCanCacheRead = true;
 		cFYI(1, "Exclusive Oplock granted on inode %p", inode);
-	} else if ((*oplock & 0xF) == OPLOCK_READ)
+	} else if ((oplock & 0xF) == OPLOCK_READ)
 		pCifsInode->clientCanCacheRead = true;
 
 	return rc;
@@ -224,6 +224,7 @@ int cifs_open(struct inode *inode, struct file *file)
 	__u32 oplock;
 	struct cifs_sb_info *cifs_sb;
 	struct cifsTconInfo *tcon;
+	struct tcon_link *tlink;
 	struct cifsFileInfo *pCifsFile = NULL;
 	struct cifsInodeInfo *pCifsInode;
 	char *full_path = NULL;
@@ -235,7 +236,12 @@ int cifs_open(struct inode *inode, struct file *file)
 	xid = GetXid();
 
 	cifs_sb = CIFS_SB(inode->i_sb);
-	tcon = cifs_sb->tcon;
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink)) {
+		FreeXid(xid);
+		return PTR_ERR(tlink);
+	}
+	tcon = tlink_tcon(tlink);
 
 	pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
 
@@ -277,7 +283,7 @@ int cifs_open(struct inode *inode, struct file *file)
 
 			pCifsFile = cifs_new_fileinfo(inode, netfid, file,
 							file->f_path.mnt,
-							oflags);
+							tlink, oflags, oplock);
 			if (pCifsFile == NULL) {
 				CIFSSMBClose(xid, tcon, netfid);
 				rc = -ENOMEM;
@@ -345,7 +351,7 @@ int cifs_open(struct inode *inode, struct file *file)
 		goto out;
 	}
 
-	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
+	if (tcon->ses->capabilities & CAP_NT_SMBS)
 		rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
 			 desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
 			 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
@@ -365,12 +371,12 @@ int cifs_open(struct inode *inode, struct file *file)
 		goto out;
 	}
 
-	rc = cifs_open_inode_helper(inode, tcon, &oplock, buf, full_path, xid);
+	rc = cifs_open_inode_helper(inode, tcon, oplock, buf, full_path, xid);
 	if (rc != 0)
 		goto out;
 
 	pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt,
-					file->f_flags);
+					tlink, file->f_flags, oplock);
 	if (pCifsFile == NULL) {
 		rc = -ENOMEM;
 		goto out;
@@ -402,6 +408,7 @@ out:
 	kfree(buf);
 	kfree(full_path);
 	FreeXid(xid);
+	cifs_put_tlink(tlink);
 	return rc;
 }
 
@@ -461,7 +468,7 @@ static int cifs_reopen_file(struct file *file, bool can_flush)
 	}
 
 	cifs_sb = CIFS_SB(inode->i_sb);
-	tcon = cifs_sb->tcon;
+	tcon = tlink_tcon(pCifsFile->tlink);
 
 /* can not grab rename sem here because various ops, including
    those that already have the rename sem can end up causing writepage
@@ -575,7 +582,7 @@ int cifs_close(struct inode *inode, struct file *file)
 	xid = GetXid();
 
 	cifs_sb = CIFS_SB(inode->i_sb);
-	pTcon = cifs_sb->tcon;
+	pTcon = tlink_tcon(pSMBFile->tlink);
 	if (pSMBFile) {
 		struct cifsLockInfo *li, *tmp;
 		write_lock(&GlobalSMBSeslock);
@@ -653,11 +660,7 @@ int cifs_closedir(struct inode *inode, struct file *file)
 	xid = GetXid();
 
 	if (pCFileStruct) {
-		struct cifsTconInfo *pTcon;
-		struct cifs_sb_info *cifs_sb =
-			CIFS_SB(file->f_path.dentry->d_sb);
-
-		pTcon = cifs_sb->tcon;
+		struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink);
 
 		cFYI(1, "Freeing private data in close dir");
 		write_lock(&GlobalSMBSeslock);
@@ -681,6 +684,7 @@ int cifs_closedir(struct inode *inode, struct file *file)
 			else
 				cifs_buf_release(ptmp);
 		}
+		cifs_put_tlink(pCFileStruct->tlink);
 		kfree(file->private_data);
 		file->private_data = NULL;
 	}
@@ -767,7 +771,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 		cFYI(1, "Unknown type of lock");
 
 	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
-	tcon = cifs_sb->tcon;
+	tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink);
 
 	if (file->private_data == NULL) {
 		rc = -EBADF;
@@ -960,14 +964,14 @@ ssize_t cifs_user_write(struct file *file, const char __user *write_data,
 
 	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 
-	pTcon = cifs_sb->tcon;
-
 	/* cFYI(1, " write %d bytes to offset %lld of %s", write_size,
 	   *poffset, file->f_path.dentry->d_name.name); */
 
 	if (file->private_data == NULL)
 		return -EBADF;
+
 	open_file = file->private_data;
+	pTcon = tlink_tcon(open_file->tlink);
 
 	rc = generic_write_checks(file, poffset, &write_size, 0);
 	if (rc)
@@ -1062,14 +1066,13 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
 
 	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 
-	pTcon = cifs_sb->tcon;
-
 	cFYI(1, "write %zd bytes to offset %lld of %s", write_size,
 	   *poffset, file->f_path.dentry->d_name.name);
 
 	if (file->private_data == NULL)
 		return -EBADF;
 	open_file = file->private_data;
+	pTcon = tlink_tcon(open_file->tlink);
 
 	xid = GetXid();
 
@@ -1165,9 +1168,15 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
 }
 
 #ifdef CONFIG_CIFS_EXPERIMENTAL
-struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode)
+struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode,
+					bool fsuid_only)
 {
 	struct cifsFileInfo *open_file = NULL;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
+
+	/* only filter by fsuid on multiuser mounts */
+	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
+		fsuid_only = false;
 
 	read_lock(&GlobalSMBSeslock);
 	/* we could simply get the first_list_entry since write-only entries
@@ -1176,6 +1185,8 @@ struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode)
 	list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
 		if (open_file->closePend)
 			continue;
+		if (fsuid_only && open_file->uid != current_fsuid())
+			continue;
 		if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) ||
 		    (open_file->pfile->f_flags & O_RDONLY))) {
 			if (!open_file->invalidHandle) {
@@ -1195,9 +1206,11 @@ struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode)
 }
 #endif
 
-struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
+struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
+					bool fsuid_only)
 {
 	struct cifsFileInfo *open_file;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
 	bool any_available = false;
 	int rc;
 
@@ -1211,13 +1224,19 @@ struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
 		return NULL;
 	}
 
+	/* only filter by fsuid on multiuser mounts */
+	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
+		fsuid_only = false;
+
 	read_lock(&GlobalSMBSeslock);
 refind_writable:
 	list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
-		if (open_file->closePend ||
-		    (!any_available && open_file->pid != current->tgid))
+		if (open_file->closePend)
+			continue;
+		if (!any_available && open_file->pid != current->tgid)
+			continue;
+		if (fsuid_only && open_file->uid != current_fsuid())
 			continue;
-
 		if (open_file->pfile &&
 		    ((open_file->pfile->f_flags & O_RDWR) ||
 		     (open_file->pfile->f_flags & O_WRONLY))) {
@@ -1284,7 +1303,6 @@ static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
 	int rc = -EFAULT;
 	int bytes_written = 0;
 	struct cifs_sb_info *cifs_sb;
-	struct cifsTconInfo *pTcon;
 	struct inode *inode;
 	struct cifsFileInfo *open_file;
 
@@ -1293,7 +1311,6 @@ static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
 
 	inode = page->mapping->host;
 	cifs_sb = CIFS_SB(inode->i_sb);
-	pTcon = cifs_sb->tcon;
 
 	offset += (loff_t)from;
 	write_data = kmap(page);
@@ -1314,7 +1331,7 @@ static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
 	if (mapping->host->i_size - offset < (loff_t)to)
 		to = (unsigned)(mapping->host->i_size - offset);
 
-	open_file = find_writable_file(CIFS_I(mapping->host));
+	open_file = find_writable_file(CIFS_I(mapping->host), false);
 	if (open_file) {
 		bytes_written = cifs_write(open_file->pfile, write_data,
 					   to-from, &offset);
@@ -1352,6 +1369,7 @@ static int cifs_writepages(struct address_space *mapping,
 	int nr_pages;
 	__u64 offset = 0;
 	struct cifsFileInfo *open_file;
+	struct cifsTconInfo *tcon;
 	struct cifsInodeInfo *cifsi = CIFS_I(mapping->host);
 	struct page *page;
 	struct pagevec pvec;
@@ -1359,6 +1377,15 @@ static int cifs_writepages(struct address_space *mapping,
 	int scanned = 0;
 	int xid, long_op;
 
+	/*
+	 * BB: Is this meaningful for a non-block-device file system?
+	 * If it is, we should test it again after we do I/O
+	 */
+	if (wbc->nonblocking && bdi_write_congested(bdi)) {
+		wbc->encountered_congestion = 1;
+		return 0;
+	}
+
 	cifs_sb = CIFS_SB(mapping->host->i_sb);
 
 	/*
@@ -1368,27 +1395,29 @@ static int cifs_writepages(struct address_space *mapping,
 	if (cifs_sb->wsize < PAGE_CACHE_SIZE)
 		return generic_writepages(mapping, wbc);
 
-	if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server))
-		if (cifs_sb->tcon->ses->server->secMode &
-				(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
-			if (!experimEnabled)
-				return generic_writepages(mapping, wbc);
-
 	iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL);
 	if (iov == NULL)
 		return generic_writepages(mapping, wbc);
 
-
 	/*
-	 * BB: Is this meaningful for a non-block-device file system?
-	 * If it is, we should test it again after we do I/O
+	 * if there's no open file, then this is likely to fail too,
+	 * but it'll at least handle the return. Maybe it should be
+	 * a BUG() instead?
 	 */
-	if (wbc->nonblocking && bdi_write_congested(bdi)) {
-		wbc->encountered_congestion = 1;
+	open_file = find_writable_file(CIFS_I(mapping->host), false);
+	if (!open_file) {
 		kfree(iov);
-		return 0;
+		return generic_writepages(mapping, wbc);
 	}
 
+	tcon = tlink_tcon(open_file->tlink);
+	if (!experimEnabled && tcon->ses->server->secMode &
+			(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
+		cifsFileInfo_put(open_file);
+		return generic_writepages(mapping, wbc);
+	}
+	cifsFileInfo_put(open_file);
+
 	xid = GetXid();
 
 	pagevec_init(&pvec, 0);
@@ -1492,38 +1521,34 @@ retry:
 				break;
 		}
 		if (n_iov) {
-			/* Search for a writable handle every time we call
-			 * CIFSSMBWrite2.  We can't rely on the last handle
-			 * we used to still be valid
-			 */
-			open_file = find_writable_file(CIFS_I(mapping->host));
+			open_file = find_writable_file(CIFS_I(mapping->host),
+							false);
 			if (!open_file) {
 				cERROR(1, "No writable handles for inode");
 				rc = -EBADF;
 			} else {
 				long_op = cifs_write_timeout(cifsi, offset);
-				rc = CIFSSMBWrite2(xid, cifs_sb->tcon,
-						   open_file->netfid,
+				rc = CIFSSMBWrite2(xid, tcon, open_file->netfid,
 						   bytes_to_write, offset,
 						   &bytes_written, iov, n_iov,
 						   long_op);
 				cifsFileInfo_put(open_file);
 				cifs_update_eof(cifsi, offset, bytes_written);
+			}
 
-				if (rc || bytes_written < bytes_to_write) {
-					cERROR(1, "Write2 ret %d, wrote %d",
-						  rc, bytes_written);
-					/* BB what if continued retry is
-					   requested via mount flags? */
-					if (rc == -ENOSPC)
-						set_bit(AS_ENOSPC, &mapping->flags);
-					else
-						set_bit(AS_EIO, &mapping->flags);
-				} else {
-					cifs_stats_bytes_written(cifs_sb->tcon,
-								 bytes_written);
-				}
+			if (rc || bytes_written < bytes_to_write) {
+				cERROR(1, "Write2 ret %d, wrote %d",
+					  rc, bytes_written);
+				/* BB what if continued retry is
+				   requested via mount flags? */
+				if (rc == -ENOSPC)
+					set_bit(AS_ENOSPC, &mapping->flags);
+				else
+					set_bit(AS_EIO, &mapping->flags);
+			} else {
+				cifs_stats_bytes_written(tcon, bytes_written);
 			}
+
 			for (i = 0; i < n_iov; i++) {
 				page = pvec.pages[first + i];
 				/* Should we also set page error on
@@ -1665,7 +1690,7 @@ int cifs_fsync(struct file *file, int datasync)
 	if (rc == 0) {
 		rc = CIFS_I(inode)->write_behind_rc;
 		CIFS_I(inode)->write_behind_rc = 0;
-		tcon = CIFS_SB(inode->i_sb)->tcon;
+		tcon = tlink_tcon(smbfile->tlink);
 		if (!rc && tcon && smbfile &&
 		   !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC))
 			rc = CIFSSMBFlush(xid, tcon, smbfile->netfid);
@@ -1750,7 +1775,6 @@ ssize_t cifs_user_read(struct file *file, char __user *read_data,
 
 	xid = GetXid();
 	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
-	pTcon = cifs_sb->tcon;
 
 	if (file->private_data == NULL) {
 		rc = -EBADF;
@@ -1758,6 +1782,7 @@ ssize_t cifs_user_read(struct file *file, char __user *read_data,
 		return rc;
 	}
 	open_file = file->private_data;
+	pTcon = tlink_tcon(open_file->tlink);
 
 	if ((file->f_flags & O_ACCMODE) == O_WRONLY)
 		cFYI(1, "attempting read on write only file instance");
@@ -1831,7 +1856,6 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
 
 	xid = GetXid();
 	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
-	pTcon = cifs_sb->tcon;
 
 	if (file->private_data == NULL) {
 		rc = -EBADF;
@@ -1839,6 +1863,7 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
 		return rc;
 	}
 	open_file = file->private_data;
+	pTcon = tlink_tcon(open_file->tlink);
 
 	if ((file->f_flags & O_ACCMODE) == O_WRONLY)
 		cFYI(1, "attempting read on write only file instance");
@@ -1974,7 +1999,7 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
 	}
 	open_file = file->private_data;
 	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
-	pTcon = cifs_sb->tcon;
+	pTcon = tlink_tcon(open_file->tlink);
 
 	/*
 	 * Reads as many pages as possible from fscache. Returns -ENOBUFS
@@ -2312,7 +2337,6 @@ void cifs_oplock_break(struct work_struct *work)
 						  oplock_break);
 	struct inode *inode = cfile->pInode;
 	struct cifsInodeInfo *cinode = CIFS_I(inode);
-	struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->mnt->mnt_sb);
 	int rc, waitrc = 0;
 
 	if (inode && S_ISREG(inode->i_mode)) {
@@ -2339,8 +2363,8 @@ void cifs_oplock_break(struct work_struct *work)
 	 * disconnected since oplock already released by the server
 	 */
 	if (!cfile->closePend && !cfile->oplock_break_cancelled) {
-		rc = CIFSSMBLock(0, cifs_sb->tcon, cfile->netfid, 0, 0, 0, 0,
-				 LOCKING_ANDX_OPLOCK_RELEASE, false);
+		rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0,
+				 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false);
 		cFYI(1, "Oplock release rc = %d", rc);
 	}
 

fs/cifs/fscache.c

@@ -62,15 +62,15 @@ static void cifs_fscache_enable_inode_cookie(struct inode *inode)
 {
 	struct cifsInodeInfo *cifsi = CIFS_I(inode);
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 
 	if (cifsi->fscache)
 		return;
 
-	cifsi->fscache = fscache_acquire_cookie(cifs_sb->tcon->fscache,
-				&cifs_fscache_inode_object_def,
-				cifsi);
-	cFYI(1, "CIFS: got FH cookie (0x%p/0x%p)",
-			cifs_sb->tcon->fscache, cifsi->fscache);
+	cifsi->fscache = fscache_acquire_cookie(tcon->fscache,
+				&cifs_fscache_inode_object_def, cifsi);
+	cFYI(1, "CIFS: got FH cookie (0x%p/0x%p)", tcon->fscache,
+				cifsi->fscache);
 }
 
 void cifs_fscache_release_inode_cookie(struct inode *inode)
@@ -117,7 +117,8 @@ void cifs_fscache_reset_inode_cookie(struct inode *inode)
 		/* retire the current fscache cache and get a new one */
 		fscache_relinquish_cookie(cifsi->fscache, 1);
 
-		cifsi->fscache = fscache_acquire_cookie(cifs_sb->tcon->fscache,
+		cifsi->fscache = fscache_acquire_cookie(
+					cifs_sb_master_tcon(cifs_sb)->fscache,
 					&cifs_fscache_inode_object_def,
 					cifsi);
 		cFYI(1, "CIFS: new cookie 0x%p oldcookie 0x%p",

fs/cifs/inode.c

@@ -52,7 +52,7 @@ static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
 
 
 		/* check if server can support readpages */
-		if (cifs_sb->tcon->ses->server->maxBuf <
+		if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
 				PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
 			inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
 		else
@@ -288,8 +288,8 @@ int cifs_get_file_info_unix(struct file *filp)
 	struct cifs_fattr fattr;
 	struct inode *inode = filp->f_path.dentry->d_inode;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
-	struct cifsTconInfo *tcon = cifs_sb->tcon;
 	struct cifsFileInfo *cfile = filp->private_data;
+	struct cifsTconInfo *tcon = tlink_tcon(cfile->tlink);
 
 	xid = GetXid();
 	rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->netfid, &find_data);
@@ -313,15 +313,21 @@ int cifs_get_inode_info_unix(struct inode **pinode,
 	FILE_UNIX_BASIC_INFO find_data;
 	struct cifs_fattr fattr;
 	struct cifsTconInfo *tcon;
+	struct tcon_link *tlink;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 
-	tcon = cifs_sb->tcon;
 	cFYI(1, "Getting info on %s", full_path);
 
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+
 	/* could have done a find first instead but this returns more info */
 	rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
 				  cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 					CIFS_MOUNT_MAP_SPECIAL_CHR);
+	cifs_put_tlink(tlink);
 
 	if (!rc) {
 		cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
@@ -332,6 +338,13 @@ int cifs_get_inode_info_unix(struct inode **pinode,
 		return rc;
 	}
 
+	/* check for Minshall+French symlinks */
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
+		int tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
+		if (tmprc)
+			cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
+	}
+
 	if (*pinode == NULL) {
 		/* get new inode */
 		cifs_fill_uniqueid(sb, &fattr);
@@ -353,7 +366,8 @@ cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
 	int rc;
 	int oplock = 0;
 	__u16 netfid;
-	struct cifsTconInfo *pTcon = cifs_sb->tcon;
+	struct tcon_link *tlink;
+	struct cifsTconInfo *tcon;
 	char buf[24];
 	unsigned int bytes_read;
 	char *pbuf;
@@ -372,7 +386,12 @@ cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
 		return -EINVAL;	 /* EOPNOTSUPP? */
 	}
 
-	rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+
+	rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, GENERIC_READ,
 			 CREATE_NOT_DIR, &netfid, &oplock, NULL,
 			 cifs_sb->local_nls,
 			 cifs_sb->mnt_cifs_flags &
@@ -380,7 +399,7 @@ cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
 	if (rc == 0) {
 		int buf_type = CIFS_NO_BUFFER;
 			/* Read header */
-		rc = CIFSSMBRead(xid, pTcon, netfid,
+		rc = CIFSSMBRead(xid, tcon, netfid,
 				 24 /* length */, 0 /* offset */,
 				 &bytes_read, &pbuf, &buf_type);
 		if ((rc == 0) && (bytes_read >= 8)) {
@@ -422,8 +441,9 @@ cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
 			fattr->cf_dtype = DT_REG;
 			rc = -EOPNOTSUPP; /* or some unknown SFU type */
 		}
-		CIFSSMBClose(xid, pTcon, netfid);
+		CIFSSMBClose(xid, tcon, netfid);
 	}
+	cifs_put_tlink(tlink);
 	return rc;
 }
 
@@ -441,11 +461,19 @@ static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
 	ssize_t rc;
 	char ea_value[4];
 	__u32 mode;
+	struct tcon_link *tlink;
+	struct cifsTconInfo *tcon;
+
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
 
-	rc = CIFSSMBQAllEAs(xid, cifs_sb->tcon, path, "SETFILEBITS",
+	rc = CIFSSMBQAllEAs(xid, tcon, path, "SETFILEBITS",
 			    ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 			    cifs_sb->mnt_cifs_flags &
 				CIFS_MOUNT_MAP_SPECIAL_CHR);
+	cifs_put_tlink(tlink);
 	if (rc < 0)
 		return (int)rc;
 	else if (rc > 3) {
@@ -468,6 +496,8 @@ static void
 cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
 		       struct cifs_sb_info *cifs_sb, bool adjust_tz)
 {
+	struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
+
 	memset(fattr, 0, sizeof(*fattr));
 	fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
 	if (info->DeletePending)
@@ -482,8 +512,8 @@ cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
 	fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
 
 	if (adjust_tz) {
-		fattr->cf_ctime.tv_sec += cifs_sb->tcon->ses->server->timeAdj;
-		fattr->cf_mtime.tv_sec += cifs_sb->tcon->ses->server->timeAdj;
+		fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
+		fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
 	}
 
 	fattr->cf_eof = le64_to_cpu(info->EndOfFile);
@@ -515,8 +545,8 @@ int cifs_get_file_info(struct file *filp)
 	struct cifs_fattr fattr;
 	struct inode *inode = filp->f_path.dentry->d_inode;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
-	struct cifsTconInfo *tcon = cifs_sb->tcon;
 	struct cifsFileInfo *cfile = filp->private_data;
+	struct cifsTconInfo *tcon = tlink_tcon(cfile->tlink);
 
 	xid = GetXid();
 	rc = CIFSSMBQFileInfo(xid, tcon, cfile->netfid, &find_data);
@@ -554,26 +584,33 @@ int cifs_get_inode_info(struct inode **pinode,
 {
 	int rc = 0, tmprc;
 	struct cifsTconInfo *pTcon;
+	struct tcon_link *tlink;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 	char *buf = NULL;
 	bool adjustTZ = false;
 	struct cifs_fattr fattr;
 
-	pTcon = cifs_sb->tcon;
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	pTcon = tlink_tcon(tlink);
+
 	cFYI(1, "Getting info on %s", full_path);
 
 	if ((pfindData == NULL) && (*pinode != NULL)) {
 		if (CIFS_I(*pinode)->clientCanCacheRead) {
 			cFYI(1, "No need to revalidate cached inode sizes");
-			return rc;
+			goto cgii_exit;
 		}
 	}
 
 	/* if file info not passed in then get it from server */
 	if (pfindData == NULL) {
 		buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
-		if (buf == NULL)
-			return -ENOMEM;
+		if (buf == NULL) {
+			rc = -ENOMEM;
+			goto cgii_exit;
+		}
 		pfindData = (FILE_ALL_INFO *)buf;
 
 		/* could do find first instead but this returns more info */
@@ -661,6 +698,13 @@ int cifs_get_inode_info(struct inode **pinode,
 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 		cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
 
+	/* check for Minshall+French symlinks */
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
+		tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
+		if (tmprc)
+			cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
+	}
+
 	if (!*pinode) {
 		*pinode = cifs_iget(sb, &fattr);
 		if (!*pinode)
@@ -671,6 +715,7 @@ int cifs_get_inode_info(struct inode **pinode,
 
 cgii_exit:
 	kfree(buf);
+	cifs_put_tlink(tlink);
 	return rc;
 }
 
@@ -683,6 +728,7 @@ char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb)
 	int pplen = cifs_sb->prepathlen;
 	int dfsplen;
 	char *full_path = NULL;
+	struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 
 	/* if no prefix path, simply set path to the root of share to "" */
 	if (pplen == 0) {
@@ -692,8 +738,8 @@ char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb)
 		return full_path;
 	}
 
-	if (cifs_sb->tcon && (cifs_sb->tcon->Flags & SMB_SHARE_IS_IN_DFS))
-		dfsplen = strnlen(cifs_sb->tcon->treeName, MAX_TREE_SIZE + 1);
+	if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
+		dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
 	else
 		dfsplen = 0;
 
@@ -702,7 +748,7 @@ char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb)
 		return full_path;
 
 	if (dfsplen) {
-		strncpy(full_path, cifs_sb->tcon->treeName, dfsplen);
+		strncpy(full_path, tcon->treeName, dfsplen);
 		/* switch slash direction in prepath depending on whether
 		 * windows or posix style path names
 		 */
@@ -818,18 +864,18 @@ retry_iget5_locked:
 struct inode *cifs_root_iget(struct super_block *sb, unsigned long ino)
 {
 	int xid;
-	struct cifs_sb_info *cifs_sb;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 	struct inode *inode = NULL;
 	long rc;
 	char *full_path;
+	struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 
-	cifs_sb = CIFS_SB(sb);
 	full_path = cifs_build_path_to_root(cifs_sb);
 	if (full_path == NULL)
 		return ERR_PTR(-ENOMEM);
 
 	xid = GetXid();
-	if (cifs_sb->tcon->unix_ext)
+	if (tcon->unix_ext)
 		rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
 	else
 		rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
@@ -840,10 +886,10 @@ struct inode *cifs_root_iget(struct super_block *sb, unsigned long ino)
 
 #ifdef CONFIG_CIFS_FSCACHE
 	/* populate tcon->resource_id */
-	cifs_sb->tcon->resource_id = CIFS_I(inode)->uniqueid;
+	tcon->resource_id = CIFS_I(inode)->uniqueid;
 #endif
 
-	if (rc && cifs_sb->tcon->ipc) {
+	if (rc && tcon->ipc) {
 		cFYI(1, "ipc connection - fake read inode");
 		inode->i_mode |= S_IFDIR;
 		inode->i_nlink = 2;
@@ -879,7 +925,8 @@ cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
 	struct cifsFileInfo *open_file;
 	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
-	struct cifsTconInfo *pTcon = cifs_sb->tcon;
+	struct tcon_link *tlink = NULL;
+	struct cifsTconInfo *pTcon;
 	FILE_BASIC_INFO	info_buf;
 
 	if (attrs == NULL)
@@ -918,13 +965,22 @@ cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
 	/*
 	 * If the file is already open for write, just use that fileid
 	 */
-	open_file = find_writable_file(cifsInode);
+	open_file = find_writable_file(cifsInode, true);
 	if (open_file) {
 		netfid = open_file->netfid;
 		netpid = open_file->pid;
+		pTcon = tlink_tcon(open_file->tlink);
 		goto set_via_filehandle;
 	}
 
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink)) {
+		rc = PTR_ERR(tlink);
+		tlink = NULL;
+		goto out;
+	}
+	pTcon = tlink_tcon(tlink);
+
 	/*
 	 * NT4 apparently returns success on this call, but it doesn't
 	 * really work.
@@ -968,6 +1024,8 @@ set_via_filehandle:
 	else
 		cifsFileInfo_put(open_file);
 out:
+	if (tlink != NULL)
+		cifs_put_tlink(tlink);
 	return rc;
 }
 
@@ -985,10 +1043,16 @@ cifs_rename_pending_delete(char *full_path, struct dentry *dentry, int xid)
 	struct inode *inode = dentry->d_inode;
 	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
-	struct cifsTconInfo *tcon = cifs_sb->tcon;
+	struct tcon_link *tlink;
+	struct cifsTconInfo *tcon;
 	__u32 dosattr, origattr;
 	FILE_BASIC_INFO *info_buf = NULL;
 
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+
 	rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
 			 DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
 			 &netfid, &oplock, NULL, cifs_sb->local_nls,
@@ -1057,6 +1121,7 @@ out_close:
 	CIFSSMBClose(xid, tcon, netfid);
 out:
 	kfree(info_buf);
+	cifs_put_tlink(tlink);
 	return rc;
 
 	/*
@@ -1096,12 +1161,18 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
 	struct cifsInodeInfo *cifs_inode;
 	struct super_block *sb = dir->i_sb;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
-	struct cifsTconInfo *tcon = cifs_sb->tcon;
+	struct tcon_link *tlink;
+	struct cifsTconInfo *tcon;
 	struct iattr *attrs = NULL;
 	__u32 dosattr = 0, origattr = 0;
 
 	cFYI(1, "cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry);
 
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+
 	xid = GetXid();
 
 	/* Unlink can be called from rename so we can not take the
@@ -1109,8 +1180,7 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
 	full_path = build_path_from_dentry(dentry);
 	if (full_path == NULL) {
 		rc = -ENOMEM;
-		FreeXid(xid);
-		return rc;
+		goto unlink_out;
 	}
 
 	if ((tcon->ses->capabilities & CAP_UNIX) &&
@@ -1176,10 +1246,11 @@ out_reval:
 	dir->i_ctime = dir->i_mtime = current_fs_time(sb);
 	cifs_inode = CIFS_I(dir);
 	CIFS_I(dir)->time = 0;	/* force revalidate of dir as well */
-
+unlink_out:
 	kfree(full_path);
 	kfree(attrs);
 	FreeXid(xid);
+	cifs_put_tlink(tlink);
 	return rc;
 }
 
@@ -1188,6 +1259,7 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 	int rc = 0, tmprc;
 	int xid;
 	struct cifs_sb_info *cifs_sb;
+	struct tcon_link *tlink;
 	struct cifsTconInfo *pTcon;
 	char *full_path = NULL;
 	struct inode *newinode = NULL;
@@ -1195,16 +1267,18 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 
 	cFYI(1, "In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode);
 
-	xid = GetXid();
-
 	cifs_sb = CIFS_SB(inode->i_sb);
-	pTcon = cifs_sb->tcon;
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	pTcon = tlink_tcon(tlink);
+
+	xid = GetXid();
 
 	full_path = build_path_from_dentry(direntry);
 	if (full_path == NULL) {
 		rc = -ENOMEM;
-		FreeXid(xid);
-		return rc;
+		goto mkdir_out;
 	}
 
 	if ((pTcon->ses->capabilities & CAP_UNIX) &&
@@ -1362,6 +1436,7 @@ mkdir_get_info:
 mkdir_out:
 	kfree(full_path);
 	FreeXid(xid);
+	cifs_put_tlink(tlink);
 	return rc;
 }
 
@@ -1370,6 +1445,7 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 	int rc = 0;
 	int xid;
 	struct cifs_sb_info *cifs_sb;
+	struct tcon_link *tlink;
 	struct cifsTconInfo *pTcon;
 	char *full_path = NULL;
 	struct cifsInodeInfo *cifsInode;
@@ -1378,18 +1454,23 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 
 	xid = GetXid();
 
-	cifs_sb = CIFS_SB(inode->i_sb);
-	pTcon = cifs_sb->tcon;
-
 	full_path = build_path_from_dentry(direntry);
 	if (full_path == NULL) {
 		rc = -ENOMEM;
-		FreeXid(xid);
-		return rc;
+		goto rmdir_exit;
 	}
 
+	cifs_sb = CIFS_SB(inode->i_sb);
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink)) {
+		rc = PTR_ERR(tlink);
+		goto rmdir_exit;
+	}
+	pTcon = tlink_tcon(tlink);
+
 	rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
 			  cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+	cifs_put_tlink(tlink);
 
 	if (!rc) {
 		drop_nlink(inode);
@@ -1410,6 +1491,7 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 	direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
 		current_fs_time(inode->i_sb);
 
+rmdir_exit:
 	kfree(full_path);
 	FreeXid(xid);
 	return rc;
@@ -1420,10 +1502,16 @@ cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
 		struct dentry *to_dentry, const char *toPath)
 {
 	struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
-	struct cifsTconInfo *pTcon = cifs_sb->tcon;
+	struct tcon_link *tlink;
+	struct cifsTconInfo *pTcon;
 	__u16 srcfid;
 	int oplock, rc;
 
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	pTcon = tlink_tcon(tlink);
+
 	/* try path-based rename first */
 	rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
 			   cifs_sb->mnt_cifs_flags &
@@ -1435,11 +1523,11 @@ cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
 	 * rename by filehandle to various Windows servers.
 	 */
 	if (rc == 0 || rc != -ETXTBSY)
-		return rc;
+		goto do_rename_exit;
 
 	/* open-file renames don't work across directories */
 	if (to_dentry->d_parent != from_dentry->d_parent)
-		return rc;
+		goto do_rename_exit;
 
 	/* open the file to be renamed -- we need DELETE perms */
 	rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
@@ -1455,7 +1543,8 @@ cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
 
 		CIFSSMBClose(xid, pTcon, srcfid);
 	}
-
+do_rename_exit:
+	cifs_put_tlink(tlink);
 	return rc;
 }
 
@@ -1465,13 +1554,17 @@ int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
 	char *fromName = NULL;
 	char *toName = NULL;
 	struct cifs_sb_info *cifs_sb;
+	struct tcon_link *tlink;
 	struct cifsTconInfo *tcon;
 	FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
 	FILE_UNIX_BASIC_INFO *info_buf_target;
 	int xid, rc, tmprc;
 
 	cifs_sb = CIFS_SB(source_dir->i_sb);
-	tcon = cifs_sb->tcon;
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
 
 	xid = GetXid();
 
@@ -1547,6 +1640,7 @@ cifs_rename_exit:
 	kfree(fromName);
 	kfree(toName);
 	FreeXid(xid);
+	cifs_put_tlink(tlink);
 	return rc;
 }
 
@@ -1599,11 +1693,12 @@ int cifs_revalidate_file(struct file *filp)
 {
 	int rc = 0;
 	struct inode *inode = filp->f_path.dentry->d_inode;
+	struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
 
 	if (!cifs_inode_needs_reval(inode))
 		goto check_inval;
 
-	if (CIFS_SB(inode->i_sb)->tcon->unix_ext)
+	if (tlink_tcon(cfile->tlink)->unix_ext)
 		rc = cifs_get_file_info_unix(filp);
 	else
 		rc = cifs_get_file_info(filp);
@@ -1644,7 +1739,7 @@ int cifs_revalidate_dentry(struct dentry *dentry)
 		 "jiffies %ld", full_path, inode, inode->i_count.counter,
 		 dentry, dentry->d_time, jiffies);
 
-	if (CIFS_SB(sb)->tcon->unix_ext)
+	if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
 		rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
 	else
 		rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
@@ -1662,11 +1757,21 @@ check_inval:
 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
 	struct kstat *stat)
 {
+	struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
+	struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 	int err = cifs_revalidate_dentry(dentry);
+
 	if (!err) {
 		generic_fillattr(dentry->d_inode, stat);
 		stat->blksize = CIFS_MAX_MSGSIZE;
 		stat->ino = CIFS_I(dentry->d_inode)->uniqueid;
+		if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
+		    !tcon->unix_ext) {
+			if (!cifs_sb->mnt_uid)
+				stat->uid = current_fsuid();
+			if (!cifs_sb->mnt_uid)
+				stat->gid = current_fsgid();
+		}
 	}
 	return err;
 }
@@ -1708,7 +1813,8 @@ cifs_set_file_size(struct inode *inode, struct iattr *attrs,
 	struct cifsFileInfo *open_file;
 	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
-	struct cifsTconInfo *pTcon = cifs_sb->tcon;
+	struct tcon_link *tlink = NULL;
+	struct cifsTconInfo *pTcon = NULL;
 
 	/*
 	 * To avoid spurious oplock breaks from server, in the case of
@@ -1719,10 +1825,11 @@ cifs_set_file_size(struct inode *inode, struct iattr *attrs,
 	 * writebehind data than the SMB timeout for the SetPathInfo
 	 * request would allow
 	 */
-	open_file = find_writable_file(cifsInode);
+	open_file = find_writable_file(cifsInode, true);
 	if (open_file) {
 		__u16 nfid = open_file->netfid;
 		__u32 npid = open_file->pid;
+		pTcon = tlink_tcon(open_file->tlink);
 		rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
 					npid, false);
 		cifsFileInfo_put(open_file);
@@ -1737,6 +1844,13 @@ cifs_set_file_size(struct inode *inode, struct iattr *attrs,
 		rc = -EINVAL;
 
 	if (rc != 0) {
+		if (pTcon == NULL) {
+			tlink = cifs_sb_tlink(cifs_sb);
+			if (IS_ERR(tlink))
+				return PTR_ERR(tlink);
+			pTcon = tlink_tcon(tlink);
+		}
+
 		/* Set file size by pathname rather than by handle
 		   either because no valid, writeable file handle for
 		   it was found or because there was an error setting
@@ -1766,6 +1880,8 @@ cifs_set_file_size(struct inode *inode, struct iattr *attrs,
 				CIFSSMBClose(xid, pTcon, netfid);
 			}
 		}
+		if (tlink)
+			cifs_put_tlink(tlink);
 	}
 
 	if (rc == 0) {
@@ -1786,7 +1902,8 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
 	struct inode *inode = direntry->d_inode;
 	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
-	struct cifsTconInfo *pTcon = cifs_sb->tcon;
+	struct tcon_link *tlink;
+	struct cifsTconInfo *pTcon;
 	struct cifs_unix_set_info_args *args = NULL;
 	struct cifsFileInfo *open_file;
 
@@ -1873,17 +1990,25 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
 		args->ctime = NO_CHANGE_64;
 
 	args->device = 0;
-	open_file = find_writable_file(cifsInode);
+	open_file = find_writable_file(cifsInode, true);
 	if (open_file) {
 		u16 nfid = open_file->netfid;
 		u32 npid = open_file->pid;
+		pTcon = tlink_tcon(open_file->tlink);
 		rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
 		cifsFileInfo_put(open_file);
 	} else {
+		tlink = cifs_sb_tlink(cifs_sb);
+		if (IS_ERR(tlink)) {
+			rc = PTR_ERR(tlink);
+			goto out;
+		}
+		pTcon = tlink_tcon(tlink);
 		rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
 				    cifs_sb->local_nls,
 				    cifs_sb->mnt_cifs_flags &
 					CIFS_MOUNT_MAP_SPECIAL_CHR);
+		cifs_put_tlink(tlink);
 	}
 
 	if (rc)
@@ -2064,7 +2189,7 @@ cifs_setattr(struct dentry *direntry, struct iattr *attrs)
 {
 	struct inode *inode = direntry->d_inode;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
-	struct cifsTconInfo *pTcon = cifs_sb->tcon;
+	struct cifsTconInfo *pTcon = cifs_sb_master_tcon(cifs_sb);
 
 	if (pTcon->unix_ext)
 		return cifs_setattr_unix(direntry, attrs);

fs/cifs/ioctl.c

@@ -37,11 +37,11 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 	int xid;
 	struct cifs_sb_info *cifs_sb;
 #ifdef CONFIG_CIFS_POSIX
+	struct cifsFileInfo *pSMBFile = filep->private_data;
+	struct cifsTconInfo *tcon = tlink_tcon(pSMBFile->tlink);
 	__u64	ExtAttrBits = 0;
 	__u64	ExtAttrMask = 0;
-	__u64   caps;
-	struct cifsTconInfo *tcon;
-	struct cifsFileInfo *pSMBFile = filep->private_data;
+	__u64   caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 #endif /* CONFIG_CIFS_POSIX */
 
 	xid = GetXid();
@@ -50,17 +50,6 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 
 	cifs_sb = CIFS_SB(inode->i_sb);
 
-#ifdef CONFIG_CIFS_POSIX
-	tcon = cifs_sb->tcon;
-	if (tcon)
-		caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
-	else {
-		rc = -EIO;
-		FreeXid(xid);
-		return -EIO;
-	}
-#endif /* CONFIG_CIFS_POSIX */
-
 	switch (command) {
 		case CIFS_IOC_CHECKUMOUNT:
 			cFYI(1, "User unmount attempted");

fs/cifs/link.c

@@ -28,6 +28,296 @@
 #include "cifsproto.h"
 #include "cifs_debug.h"
 #include "cifs_fs_sb.h"
+#include "md5.h"
+
+#define CIFS_MF_SYMLINK_LEN_OFFSET (4+1)
+#define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1))
+#define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1))
+#define CIFS_MF_SYMLINK_LINK_MAXLEN (1024)
+#define CIFS_MF_SYMLINK_FILE_SIZE \
+	(CIFS_MF_SYMLINK_LINK_OFFSET + CIFS_MF_SYMLINK_LINK_MAXLEN)
+
+#define CIFS_MF_SYMLINK_LEN_FORMAT "XSym\n%04u\n"
+#define CIFS_MF_SYMLINK_MD5_FORMAT \
+	"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n"
+#define CIFS_MF_SYMLINK_MD5_ARGS(md5_hash) \
+	md5_hash[0],  md5_hash[1],  md5_hash[2],  md5_hash[3], \
+	md5_hash[4],  md5_hash[5],  md5_hash[6],  md5_hash[7], \
+	md5_hash[8],  md5_hash[9],  md5_hash[10], md5_hash[11],\
+	md5_hash[12], md5_hash[13], md5_hash[14], md5_hash[15]
+
+static int
+CIFSParseMFSymlink(const u8 *buf,
+		   unsigned int buf_len,
+		   unsigned int *_link_len,
+		   char **_link_str)
+{
+	int rc;
+	unsigned int link_len;
+	const char *md5_str1;
+	const char *link_str;
+	struct MD5Context md5_ctx;
+	u8 md5_hash[16];
+	char md5_str2[34];
+
+	if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
+		return -EINVAL;
+
+	md5_str1 = (const char *)&buf[CIFS_MF_SYMLINK_MD5_OFFSET];
+	link_str = (const char *)&buf[CIFS_MF_SYMLINK_LINK_OFFSET];
+
+	rc = sscanf(buf, CIFS_MF_SYMLINK_LEN_FORMAT, &link_len);
+	if (rc != 1)
+		return -EINVAL;
+
+	cifs_MD5_init(&md5_ctx);
+	cifs_MD5_update(&md5_ctx, (const u8 *)link_str, link_len);
+	cifs_MD5_final(md5_hash, &md5_ctx);
+
+	snprintf(md5_str2, sizeof(md5_str2),
+		 CIFS_MF_SYMLINK_MD5_FORMAT,
+		 CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
+
+	if (strncmp(md5_str1, md5_str2, 17) != 0)
+		return -EINVAL;
+
+	if (_link_str) {
+		*_link_str = kstrndup(link_str, link_len, GFP_KERNEL);
+		if (!*_link_str)
+			return -ENOMEM;
+	}
+
+	*_link_len = link_len;
+	return 0;
+}
+
+static int
+CIFSFormatMFSymlink(u8 *buf, unsigned int buf_len, const char *link_str)
+{
+	unsigned int link_len;
+	unsigned int ofs;
+	struct MD5Context md5_ctx;
+	u8 md5_hash[16];
+
+	if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
+		return -EINVAL;
+
+	link_len = strlen(link_str);
+
+	if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN)
+		return -ENAMETOOLONG;
+
+	cifs_MD5_init(&md5_ctx);
+	cifs_MD5_update(&md5_ctx, (const u8 *)link_str, link_len);
+	cifs_MD5_final(md5_hash, &md5_ctx);
+
+	snprintf(buf, buf_len,
+		 CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT,
+		 link_len,
+		 CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
+
+	ofs = CIFS_MF_SYMLINK_LINK_OFFSET;
+	memcpy(buf + ofs, link_str, link_len);
+
+	ofs += link_len;
+	if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
+		buf[ofs] = '\n';
+		ofs++;
+	}
+
+	while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
+		buf[ofs] = ' ';
+		ofs++;
+	}
+
+	return 0;
+}
+
+static int
+CIFSCreateMFSymLink(const int xid, struct cifsTconInfo *tcon,
+		    const char *fromName, const char *toName,
+		    const struct nls_table *nls_codepage, int remap)
+{
+	int rc;
+	int oplock = 0;
+	__u16 netfid = 0;
+	u8 *buf;
+	unsigned int bytes_written = 0;
+
+	buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	rc = CIFSFormatMFSymlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
+	if (rc != 0) {
+		kfree(buf);
+		return rc;
+	}
+
+	rc = CIFSSMBOpen(xid, tcon, fromName, FILE_CREATE, GENERIC_WRITE,
+			 CREATE_NOT_DIR, &netfid, &oplock, NULL,
+			 nls_codepage, remap);
+	if (rc != 0) {
+		kfree(buf);
+		return rc;
+	}
+
+	rc = CIFSSMBWrite(xid, tcon, netfid,
+			  CIFS_MF_SYMLINK_FILE_SIZE /* length */,
+			  0 /* offset */,
+			  &bytes_written, buf, NULL, 0);
+	CIFSSMBClose(xid, tcon, netfid);
+	kfree(buf);
+	if (rc != 0)
+		return rc;
+
+	if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
+		return -EIO;
+
+	return 0;
+}
+
+static int
+CIFSQueryMFSymLink(const int xid, struct cifsTconInfo *tcon,
+		   const unsigned char *searchName, char **symlinkinfo,
+		   const struct nls_table *nls_codepage, int remap)
+{
+	int rc;
+	int oplock = 0;
+	__u16 netfid = 0;
+	u8 *buf;
+	char *pbuf;
+	unsigned int bytes_read = 0;
+	int buf_type = CIFS_NO_BUFFER;
+	unsigned int link_len = 0;
+	FILE_ALL_INFO file_info;
+
+	rc = CIFSSMBOpen(xid, tcon, searchName, FILE_OPEN, GENERIC_READ,
+			 CREATE_NOT_DIR, &netfid, &oplock, &file_info,
+			 nls_codepage, remap);
+	if (rc != 0)
+		return rc;
+
+	if (file_info.EndOfFile != CIFS_MF_SYMLINK_FILE_SIZE) {
+		CIFSSMBClose(xid, tcon, netfid);
+		/* it's not a symlink */
+		return -EINVAL;
+	}
+
+	buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+	pbuf = buf;
+
+	rc = CIFSSMBRead(xid, tcon, netfid,
+			 CIFS_MF_SYMLINK_FILE_SIZE /* length */,
+			 0 /* offset */,
+			 &bytes_read, &pbuf, &buf_type);
+	CIFSSMBClose(xid, tcon, netfid);
+	if (rc != 0) {
+		kfree(buf);
+		return rc;
+	}
+
+	rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, symlinkinfo);
+	kfree(buf);
+	if (rc != 0)
+		return rc;
+
+	return 0;
+}
+
+bool
+CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr)
+{
+	if (!(fattr->cf_mode & S_IFREG))
+		/* it's not a symlink */
+		return false;
+
+	if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
+		/* it's not a symlink */
+		return false;
+
+	return true;
+}
+
+int
+CIFSCheckMFSymlink(struct cifs_fattr *fattr,
+		   const unsigned char *path,
+		   struct cifs_sb_info *cifs_sb, int xid)
+{
+	int rc;
+	int oplock = 0;
+	__u16 netfid = 0;
+	struct tcon_link *tlink;
+	struct cifsTconInfo *pTcon;
+	u8 *buf;
+	char *pbuf;
+	unsigned int bytes_read = 0;
+	int buf_type = CIFS_NO_BUFFER;
+	unsigned int link_len = 0;
+	FILE_ALL_INFO file_info;
+
+	if (!CIFSCouldBeMFSymlink(fattr))
+		/* it's not a symlink */
+		return 0;
+
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	pTcon = tlink_tcon(tlink);
+
+	rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
+			 CREATE_NOT_DIR, &netfid, &oplock, &file_info,
+			 cifs_sb->local_nls,
+			 cifs_sb->mnt_cifs_flags &
+				CIFS_MOUNT_MAP_SPECIAL_CHR);
+	if (rc != 0)
+		goto out;
+
+	if (file_info.EndOfFile != CIFS_MF_SYMLINK_FILE_SIZE) {
+		CIFSSMBClose(xid, pTcon, netfid);
+		/* it's not a symlink */
+		goto out;
+	}
+
+	buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
+	if (!buf) {
+		rc = -ENOMEM;
+		goto out;
+	}
+	pbuf = buf;
+
+	rc = CIFSSMBRead(xid, pTcon, netfid,
+			 CIFS_MF_SYMLINK_FILE_SIZE /* length */,
+			 0 /* offset */,
+			 &bytes_read, &pbuf, &buf_type);
+	CIFSSMBClose(xid, pTcon, netfid);
+	if (rc != 0) {
+		kfree(buf);
+		goto out;
+	}
+
+	rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, NULL);
+	kfree(buf);
+	if (rc == -EINVAL) {
+		/* it's not a symlink */
+		rc = 0;
+		goto out;
+	}
+
+	if (rc != 0)
+		goto out;
+
+	/* it is a symlink */
+	fattr->cf_eof = link_len;
+	fattr->cf_mode &= ~S_IFMT;
+	fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
+	fattr->cf_dtype = DT_LNK;
+out:
+	cifs_put_tlink(tlink);
+	return rc;
+}
 
 int
 cifs_hardlink(struct dentry *old_file, struct inode *inode,
@@ -37,17 +327,17 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
 	int xid;
 	char *fromName = NULL;
 	char *toName = NULL;
-	struct cifs_sb_info *cifs_sb_target;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct tcon_link *tlink;
 	struct cifsTconInfo *pTcon;
 	struct cifsInodeInfo *cifsInode;
 
-	xid = GetXid();
-
-	cifs_sb_target = CIFS_SB(inode->i_sb);
-	pTcon = cifs_sb_target->tcon;
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	pTcon = tlink_tcon(tlink);
 
-/* No need to check for cross device links since server will do that
-   BB note DFS case in future though (when we may have to check) */
+	xid = GetXid();
 
 	fromName = build_path_from_dentry(old_file);
 	toName = build_path_from_dentry(direntry);
@@ -56,16 +346,15 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
 		goto cifs_hl_exit;
 	}
 
-/*	if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)*/
 	if (pTcon->unix_ext)
 		rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
-					    cifs_sb_target->local_nls,
-					    cifs_sb_target->mnt_cifs_flags &
+					    cifs_sb->local_nls,
+					    cifs_sb->mnt_cifs_flags &
 						CIFS_MOUNT_MAP_SPECIAL_CHR);
 	else {
 		rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
-					cifs_sb_target->local_nls,
-					cifs_sb_target->mnt_cifs_flags &
+					cifs_sb->local_nls,
+					cifs_sb->mnt_cifs_flags &
 						CIFS_MOUNT_MAP_SPECIAL_CHR);
 		if ((rc == -EIO) || (rc == -EINVAL))
 			rc = -EOPNOTSUPP;
@@ -101,6 +390,7 @@ cifs_hl_exit:
 	kfree(fromName);
 	kfree(toName);
 	FreeXid(xid);
+	cifs_put_tlink(tlink);
 	return rc;
 }
 
@@ -113,10 +403,19 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
 	char *full_path = NULL;
 	char *target_path = NULL;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
-	struct cifsTconInfo *tcon = cifs_sb->tcon;
+	struct tcon_link *tlink = NULL;
+	struct cifsTconInfo *tcon;
 
 	xid = GetXid();
 
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink)) {
+		rc = PTR_ERR(tlink);
+		tlink = NULL;
+		goto out;
+	}
+	tcon = tlink_tcon(tlink);
+
 	/*
 	 * For now, we just handle symlinks with unix extensions enabled.
 	 * Eventually we should handle NTFS reparse points, and MacOS
@@ -130,7 +429,8 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
 	 * but there doesn't seem to be any harm in allowing the client to
 	 * read them.
 	 */
-	if (!(tcon->ses->capabilities & CAP_UNIX)) {
+	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
+	    && !(tcon->ses->capabilities & CAP_UNIX)) {
 		rc = -EACCES;
 		goto out;
 	}
@@ -141,8 +441,21 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
 
 	cFYI(1, "Full path: %s inode = 0x%p", full_path, inode);
 
-	rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
-				     cifs_sb->local_nls);
+	rc = -EACCES;
+	/*
+	 * First try Minshall+French Symlinks, if configured
+	 * and fallback to UNIX Extensions Symlinks.
+	 */
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
+		rc = CIFSQueryMFSymLink(xid, tcon, full_path, &target_path,
+					cifs_sb->local_nls,
+					cifs_sb->mnt_cifs_flags &
+						CIFS_MOUNT_MAP_SPECIAL_CHR);
+
+	if ((rc != 0) && (tcon->ses->capabilities & CAP_UNIX))
+		rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
+					     cifs_sb->local_nls);
+
 	kfree(full_path);
 out:
 	if (rc != 0) {
@@ -151,6 +464,8 @@ out:
 	}
 
 	FreeXid(xid);
+	if (tlink)
+		cifs_put_tlink(tlink);
 	nd_set_link(nd, target_path);
 	return NULL;
 }
@@ -160,29 +475,37 @@ cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
 {
 	int rc = -EOPNOTSUPP;
 	int xid;
-	struct cifs_sb_info *cifs_sb;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct tcon_link *tlink;
 	struct cifsTconInfo *pTcon;
 	char *full_path = NULL;
 	struct inode *newinode = NULL;
 
 	xid = GetXid();
 
-	cifs_sb = CIFS_SB(inode->i_sb);
-	pTcon = cifs_sb->tcon;
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink)) {
+		rc = PTR_ERR(tlink);
+		goto symlink_exit;
+	}
+	pTcon = tlink_tcon(tlink);
 
 	full_path = build_path_from_dentry(direntry);
-
 	if (full_path == NULL) {
 		rc = -ENOMEM;
-		FreeXid(xid);
-		return rc;
+		goto symlink_exit;
 	}
 
 	cFYI(1, "Full path: %s", full_path);
 	cFYI(1, "symname is %s", symname);
 
 	/* BB what if DFS and this volume is on different share? BB */
-	if (pTcon->unix_ext)
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
+		rc = CIFSCreateMFSymLink(xid, pTcon, full_path, symname,
+					 cifs_sb->local_nls,
+					 cifs_sb->mnt_cifs_flags &
+						CIFS_MOUNT_MAP_SPECIAL_CHR);
+	else if (pTcon->unix_ext)
 		rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
 					   cifs_sb->local_nls);
 	/* else
@@ -208,8 +531,9 @@ cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
 			d_instantiate(direntry, newinode);
 		}
 	}
-
+symlink_exit:
 	kfree(full_path);
+	cifs_put_tlink(tlink);
 	FreeXid(xid);
 	return rc;
 }

fs/cifs/misc.c

@@ -729,6 +729,6 @@ cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
 			   "properly. Hardlinks will not be recognized on this "
 			   "mount. Consider mounting with the \"noserverino\" "
 			   "option to silence this message.",
-			   cifs_sb->tcon->treeName);
+			   cifs_sb_master_tcon(cifs_sb)->treeName);
 	}
 }

fs/cifs/ntlmssp.h

@@ -61,6 +61,21 @@
 #define NTLMSSP_NEGOTIATE_KEY_XCH   0x40000000
 #define NTLMSSP_NEGOTIATE_56        0x80000000
 
+/* Define AV Pair Field IDs */
+enum av_field_type {
+	NTLMSSP_AV_EOL = 0,
+	NTLMSSP_AV_NB_COMPUTER_NAME,
+	NTLMSSP_AV_NB_DOMAIN_NAME,
+	NTLMSSP_AV_DNS_COMPUTER_NAME,
+	NTLMSSP_AV_DNS_DOMAIN_NAME,
+	NTLMSSP_AV_DNS_TREE_NAME,
+	NTLMSSP_AV_FLAGS,
+	NTLMSSP_AV_TIMESTAMP,
+	NTLMSSP_AV_RESTRICTION,
+	NTLMSSP_AV_TARGET_NAME,
+	NTLMSSP_AV_CHANNEL_BINDINGS
+};
+
 /* Although typedefs are not commonly used for structure definitions */
 /* in the Linux kernel, in this particular case they are useful      */
 /* to more closely match the standards document for NTLMSSP from     */

fs/cifs/readdir.c

@@ -102,7 +102,7 @@ cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
 		return NULL;
 	}
 
-	if (CIFS_SB(sb)->tcon->nocase)
+	if (cifs_sb_master_tcon(CIFS_SB(sb))->nocase)
 		dentry->d_op = &cifs_ci_dentry_ops;
 	else
 		dentry->d_op = &cifs_dentry_ops;
@@ -171,7 +171,7 @@ static void
 cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
 		       struct cifs_sb_info *cifs_sb)
 {
-	int offset = cifs_sb->tcon->ses->server->timeAdj;
+	int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
 
 	memset(fattr, 0, sizeof(*fattr));
 	fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
@@ -199,7 +199,7 @@ int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
 	int len;
 	int oplock = 0;
 	int rc;
-	struct cifsTconInfo *ptcon = cifs_sb->tcon;
+	struct cifsTconInfo *ptcon = cifs_sb_tcon(cifs_sb);
 	char *tmpbuffer;
 
 	rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
@@ -223,34 +223,35 @@ int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
 static int initiate_cifs_search(const int xid, struct file *file)
 {
 	int rc = 0;
-	char *full_path;
+	char *full_path = NULL;
 	struct cifsFileInfo *cifsFile;
-	struct cifs_sb_info *cifs_sb;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
+	struct tcon_link *tlink;
 	struct cifsTconInfo *pTcon;
 
-	if (file->private_data == NULL) {
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	pTcon = tlink_tcon(tlink);
+
+	if (file->private_data == NULL)
 		file->private_data =
 			kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
+	if (file->private_data == NULL) {
+		rc = -ENOMEM;
+		goto error_exit;
 	}
 
-	if (file->private_data == NULL)
-		return -ENOMEM;
 	cifsFile = file->private_data;
 	cifsFile->invalidHandle = true;
 	cifsFile->srch_inf.endOfSearch = false;
-
-	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
-	if (cifs_sb == NULL)
-		return -EINVAL;
-
-	pTcon = cifs_sb->tcon;
-	if (pTcon == NULL)
-		return -EINVAL;
+	cifsFile->tlink = cifs_get_tlink(tlink);
 
 	full_path = build_path_from_dentry(file->f_path.dentry);
-
-	if (full_path == NULL)
-		return -ENOMEM;
+	if (full_path == NULL) {
+		rc = -ENOMEM;
+		goto error_exit;
+	}
 
 	cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);
 
@@ -283,7 +284,9 @@ ffirst_retry:
 		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 		goto ffirst_retry;
 	}
+error_exit:
 	kfree(full_path);
+	cifs_put_tlink(tlink);
 	return rc;
 }
 
@@ -738,6 +741,15 @@ static int cifs_filldir(char *pfindEntry, struct file *file, filldir_t filldir,
 		cifs_autodisable_serverino(cifs_sb);
 	}
 
+	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
+	    CIFSCouldBeMFSymlink(&fattr))
+		/*
+		 * trying to get the type and mode can be slow,
+		 * so just call those regular files for now, and mark
+		 * for reval
+		 */
+		fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
+
 	ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
 	tmp_dentry = cifs_readdir_lookup(file->f_dentry, &qstring, &fattr);
 
@@ -777,9 +789,6 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 	xid = GetXid();
 
 	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
-	pTcon = cifs_sb->tcon;
-	if (pTcon == NULL)
-		return -EINVAL;
 
 	switch ((int) file->f_pos) {
 	case 0:
@@ -829,6 +838,7 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 			CIFSFindClose(xid, pTcon, cifsFile->netfid);
 		} */
 
+		pTcon = tlink_tcon(cifsFile->tlink);
 		rc = find_cifs_entry(xid, pTcon, file,
 				&current_entry, &num_to_fill);
 		if (rc) {

fs/cifs/sess.c

@@ -383,6 +383,9 @@ static int decode_ascii_ssetup(char **pbcc_area, int bleft,
 static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
 				    struct cifsSesInfo *ses)
 {
+	unsigned int tioffset; /* challenge message target info area */
+	unsigned int tilen; /* challenge message target info area length  */
+
 	CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
 
 	if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
@@ -405,6 +408,19 @@ static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
 	/* BB spec says that if AvId field of MsvAvTimestamp is populated then
 		we must set the MIC field of the AUTHENTICATE_MESSAGE */
 
+	tioffset = cpu_to_le16(pblob->TargetInfoArray.BufferOffset);
+	tilen = cpu_to_le16(pblob->TargetInfoArray.Length);
+	ses->tilen = tilen;
+	if (ses->tilen) {
+		ses->tiblob = kmalloc(tilen, GFP_KERNEL);
+		if (!ses->tiblob) {
+			cERROR(1, "Challenge target info allocation failure");
+			ses->tilen = 0;
+			return -ENOMEM;
+		}
+		memcpy(ses->tiblob,  bcc_ptr + tioffset, ses->tilen);
+	}
+
 	return 0;
 }
 
@@ -425,7 +441,7 @@ static void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
 	/* BB is NTLMV2 session security format easier to use here? */
 	flags = NTLMSSP_NEGOTIATE_56 |	NTLMSSP_REQUEST_TARGET |
 		NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
-		NTLMSSP_NEGOTIATE_NT_ONLY | NTLMSSP_NEGOTIATE_NTLM;
+		NTLMSSP_NEGOTIATE_NTLM;
 	if (ses->server->secMode &
 	   (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
 		flags |= NTLMSSP_NEGOTIATE_SIGN;
@@ -449,12 +465,14 @@ static void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
    This function returns the length of the data in the blob */
 static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
 				   struct cifsSesInfo *ses,
-				   const struct nls_table *nls_cp, bool first)
+				   const struct nls_table *nls_cp)
 {
+	int rc;
+	unsigned int size;
 	AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
 	__u32 flags;
 	unsigned char *tmp;
-	char ntlm_session_key[CIFS_SESS_KEY_SIZE];
+	struct ntlmv2_resp ntlmv2_response = {};
 
 	memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
 	sec_blob->MessageType = NtLmAuthenticate;
@@ -462,7 +480,7 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
 	flags = NTLMSSP_NEGOTIATE_56 |
 		NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
 		NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
-		NTLMSSP_NEGOTIATE_NT_ONLY | NTLMSSP_NEGOTIATE_NTLM;
+		NTLMSSP_NEGOTIATE_NTLM;
 	if (ses->server->secMode &
 	   (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
 		flags |= NTLMSSP_NEGOTIATE_SIGN;
@@ -477,19 +495,26 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
 	sec_blob->LmChallengeResponse.Length = 0;
 	sec_blob->LmChallengeResponse.MaximumLength = 0;
 
-	/* calculate session key,  BB what about adding similar ntlmv2 path? */
-	SMBNTencrypt(ses->password, ses->server->cryptKey, ntlm_session_key);
-	if (first)
-		cifs_calculate_mac_key(&ses->server->mac_signing_key,
-				       ntlm_session_key, ses->password);
-
-	memcpy(tmp, ntlm_session_key, CIFS_SESS_KEY_SIZE);
 	sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
-	sec_blob->NtChallengeResponse.Length = cpu_to_le16(CIFS_SESS_KEY_SIZE);
-	sec_blob->NtChallengeResponse.MaximumLength =
-				cpu_to_le16(CIFS_SESS_KEY_SIZE);
+	rc = setup_ntlmv2_rsp(ses, (char *)&ntlmv2_response, nls_cp);
+	if (rc) {
+		cERROR(1, "Error %d during NTLMSSP authentication", rc);
+		goto setup_ntlmv2_ret;
+	}
+	size =  sizeof(struct ntlmv2_resp);
+	memcpy(tmp, (char *)&ntlmv2_response, size);
+	tmp += size;
+	if (ses->tilen > 0) {
+		memcpy(tmp, ses->tiblob, ses->tilen);
+		tmp += ses->tilen;
+	}
 
-	tmp += CIFS_SESS_KEY_SIZE;
+	sec_blob->NtChallengeResponse.Length = cpu_to_le16(size + ses->tilen);
+	sec_blob->NtChallengeResponse.MaximumLength =
+				cpu_to_le16(size + ses->tilen);
+	kfree(ses->tiblob);
+	ses->tiblob = NULL;
+	ses->tilen = 0;
 
 	if (ses->domainName == NULL) {
 		sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
@@ -501,7 +526,6 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
 		len = cifs_strtoUCS((__le16 *)tmp, ses->domainName,
 				    MAX_USERNAME_SIZE, nls_cp);
 		len *= 2; /* unicode is 2 bytes each */
-		len += 2; /* trailing null */
 		sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
 		sec_blob->DomainName.Length = cpu_to_le16(len);
 		sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
@@ -518,7 +542,6 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
 		len = cifs_strtoUCS((__le16 *)tmp, ses->userName,
 				    MAX_USERNAME_SIZE, nls_cp);
 		len *= 2; /* unicode is 2 bytes each */
-		len += 2; /* trailing null */
 		sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
 		sec_blob->UserName.Length = cpu_to_le16(len);
 		sec_blob->UserName.MaximumLength = cpu_to_le16(len);
@@ -533,6 +556,8 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
 	sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
 	sec_blob->SessionKey.Length = 0;
 	sec_blob->SessionKey.MaximumLength = 0;
+
+setup_ntlmv2_ret:
 	return tmp - pbuffer;
 }
 
@@ -545,19 +570,6 @@ static void setup_ntlmssp_neg_req(SESSION_SETUP_ANDX *pSMB,
 
 	return;
 }
-
-static int setup_ntlmssp_auth_req(SESSION_SETUP_ANDX *pSMB,
-				  struct cifsSesInfo *ses,
-				  const struct nls_table *nls, bool first_time)
-{
-	int bloblen;
-
-	bloblen = build_ntlmssp_auth_blob(&pSMB->req.SecurityBlob[0], ses, nls,
-					  first_time);
-	pSMB->req.SecurityBlobLength = cpu_to_le16(bloblen);
-
-	return bloblen;
-}
 #endif
 
 int
@@ -580,6 +592,8 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses,
 	struct key *spnego_key = NULL;
 	__le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 	bool first_time;
+	int blob_len;
+	char *ntlmsspblob = NULL;
 
 	if (ses == NULL)
 		return -EINVAL;
@@ -690,7 +704,7 @@ ssetup_ntlmssp_authenticate:
 
 		if (first_time) /* should this be moved into common code
 				  with similar ntlmv2 path? */
-			cifs_calculate_mac_key(&ses->server->mac_signing_key,
+			cifs_calculate_session_key(&ses->server->session_key,
 				ntlm_session_key, ses->password);
 		/* copy session key */
 
@@ -725,16 +739,31 @@ ssetup_ntlmssp_authenticate:
 		pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
 		/*	cpu_to_le16(LM2_SESS_KEY_SIZE); */
 
-		pSMB->req_no_secext.CaseSensitivePasswordLength =
-			cpu_to_le16(sizeof(struct ntlmv2_resp));
-
 		/* calculate session key */
-		setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
-		/* FIXME: calculate MAC key */
+		rc = setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
+		if (rc) {
+			cERROR(1, "Error %d during NTLMv2 authentication", rc);
+			kfree(v2_sess_key);
+			goto ssetup_exit;
+		}
 		memcpy(bcc_ptr, (char *)v2_sess_key,
-		       sizeof(struct ntlmv2_resp));
+				sizeof(struct ntlmv2_resp));
 		bcc_ptr += sizeof(struct ntlmv2_resp);
 		kfree(v2_sess_key);
+		/* set case sensitive password length after tilen may get
+		 * assigned, tilen is 0 otherwise.
+		 */
+		pSMB->req_no_secext.CaseSensitivePasswordLength =
+			cpu_to_le16(sizeof(struct ntlmv2_resp) + ses->tilen);
+		if (ses->tilen > 0) {
+			memcpy(bcc_ptr, ses->tiblob, ses->tilen);
+			bcc_ptr += ses->tilen;
+			/* we never did allocate ses->domainName to free */
+			kfree(ses->tiblob);
+			ses->tiblob = NULL;
+			ses->tilen = 0;
+		}
+
 		if (ses->capabilities & CAP_UNICODE) {
 			if (iov[0].iov_len % 2) {
 				*bcc_ptr = 0;
@@ -765,15 +794,15 @@ ssetup_ntlmssp_authenticate:
 		}
 		/* bail out if key is too long */
 		if (msg->sesskey_len >
-		    sizeof(ses->server->mac_signing_key.data.krb5)) {
+		    sizeof(ses->server->session_key.data.krb5)) {
 			cERROR(1, "Kerberos signing key too long (%u bytes)",
 				msg->sesskey_len);
 			rc = -EOVERFLOW;
 			goto ssetup_exit;
 		}
 		if (first_time) {
-			ses->server->mac_signing_key.len = msg->sesskey_len;
-			memcpy(ses->server->mac_signing_key.data.krb5,
+			ses->server->session_key.len = msg->sesskey_len;
+			memcpy(ses->server->session_key.data.krb5,
 				msg->data, msg->sesskey_len);
 		}
 		pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
@@ -815,12 +844,28 @@ ssetup_ntlmssp_authenticate:
 			if (phase == NtLmNegotiate) {
 				setup_ntlmssp_neg_req(pSMB, ses);
 				iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
+				iov[1].iov_base = &pSMB->req.SecurityBlob[0];
 			} else if (phase == NtLmAuthenticate) {
-				int blob_len;
-				blob_len = setup_ntlmssp_auth_req(pSMB, ses,
-								  nls_cp,
-								  first_time);
+				/* 5 is an empirical value, large enought to
+				 * hold authenticate message, max 10 of
+				 * av paris, doamin,user,workstation mames,
+				 * flags etc..
+				 */
+				ntlmsspblob = kmalloc(
+					5*sizeof(struct _AUTHENTICATE_MESSAGE),
+					GFP_KERNEL);
+				if (!ntlmsspblob) {
+					cERROR(1, "Can't allocate NTLMSSP");
+					rc = -ENOMEM;
+					goto ssetup_exit;
+				}
+
+				blob_len = build_ntlmssp_auth_blob(ntlmsspblob,
+							ses, nls_cp);
 				iov[1].iov_len = blob_len;
+				iov[1].iov_base = ntlmsspblob;
+				pSMB->req.SecurityBlobLength =
+					cpu_to_le16(blob_len);
 				/* Make sure that we tell the server that we
 				   are using the uid that it just gave us back
 				   on the response (challenge) */
@@ -830,7 +875,6 @@ ssetup_ntlmssp_authenticate:
 				rc = -ENOSYS;
 				goto ssetup_exit;
 			}
-			iov[1].iov_base = &pSMB->req.SecurityBlob[0];
 			/* unicode strings must be word aligned */
 			if ((iov[0].iov_len + iov[1].iov_len) % 2) {
 				*bcc_ptr = 0;
@@ -931,6 +975,8 @@ ssetup_exit:
 		key_put(spnego_key);
 	}
 	kfree(str_area);
+	kfree(ntlmsspblob);
+	ntlmsspblob = NULL;
 	if (resp_buf_type == CIFS_SMALL_BUFFER) {
 		cFYI(1, "ssetup freeing small buf %p", iov[0].iov_base);
 		cifs_small_buf_release(iov[0].iov_base);

fs/cifs/transport.c

@@ -543,7 +543,7 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
 		    (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
 					     SECMODE_SIGN_ENABLED))) {
 			rc = cifs_verify_signature(midQ->resp_buf,
-						&ses->server->mac_signing_key,
+						&ses->server->session_key,
 						midQ->sequence_number+1);
 			if (rc) {
 				cERROR(1, "Unexpected SMB signature");
@@ -731,7 +731,7 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
 		    (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
 					     SECMODE_SIGN_ENABLED))) {
 			rc = cifs_verify_signature(out_buf,
-						&ses->server->mac_signing_key,
+						&ses->server->session_key,
 						midQ->sequence_number+1);
 			if (rc) {
 				cERROR(1, "Unexpected SMB signature");
@@ -981,7 +981,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
 	    (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
 				     SECMODE_SIGN_ENABLED))) {
 		rc = cifs_verify_signature(out_buf,
-					   &ses->server->mac_signing_key,
+					   &ses->server->session_key,
 					   midQ->sequence_number+1);
 		if (rc) {
 			cERROR(1, "Unexpected SMB signature");

fs/cifs/xattr.c

@@ -47,9 +47,10 @@ int cifs_removexattr(struct dentry *direntry, const char *ea_name)
 #ifdef CONFIG_CIFS_XATTR
 	int xid;
 	struct cifs_sb_info *cifs_sb;
+	struct tcon_link *tlink;
 	struct cifsTconInfo *pTcon;
 	struct super_block *sb;
-	char *full_path;
+	char *full_path = NULL;
 
 	if (direntry == NULL)
 		return -EIO;
@@ -58,16 +59,19 @@ int cifs_removexattr(struct dentry *direntry, const char *ea_name)
 	sb = direntry->d_inode->i_sb;
 	if (sb == NULL)
 		return -EIO;
-	xid = GetXid();
 
 	cifs_sb = CIFS_SB(sb);
-	pTcon = cifs_sb->tcon;
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	pTcon = tlink_tcon(tlink);
+
+	xid = GetXid();
 
 	full_path = build_path_from_dentry(direntry);
 	if (full_path == NULL) {
 		rc = -ENOMEM;
-		FreeXid(xid);
-		return rc;
+		goto remove_ea_exit;
 	}
 	if (ea_name == NULL) {
 		cFYI(1, "Null xattr names not supported");
@@ -91,6 +95,7 @@ int cifs_removexattr(struct dentry *direntry, const char *ea_name)
 remove_ea_exit:
 	kfree(full_path);
 	FreeXid(xid);
+	cifs_put_tlink(tlink);
 #endif
 	return rc;
 }
@@ -102,6 +107,7 @@ int cifs_setxattr(struct dentry *direntry, const char *ea_name,
 #ifdef CONFIG_CIFS_XATTR
 	int xid;
 	struct cifs_sb_info *cifs_sb;
+	struct tcon_link *tlink;
 	struct cifsTconInfo *pTcon;
 	struct super_block *sb;
 	char *full_path;
@@ -113,16 +119,19 @@ int cifs_setxattr(struct dentry *direntry, const char *ea_name,
 	sb = direntry->d_inode->i_sb;
 	if (sb == NULL)
 		return -EIO;
-	xid = GetXid();
 
 	cifs_sb = CIFS_SB(sb);
-	pTcon = cifs_sb->tcon;
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	pTcon = tlink_tcon(tlink);
+
+	xid = GetXid();
 
 	full_path = build_path_from_dentry(direntry);
 	if (full_path == NULL) {
 		rc = -ENOMEM;
-		FreeXid(xid);
-		return rc;
+		goto set_ea_exit;
 	}
 	/* return dos attributes as pseudo xattr */
 	/* return alt name if available as pseudo attr */
@@ -132,9 +141,8 @@ int cifs_setxattr(struct dentry *direntry, const char *ea_name,
 		returns as xattrs */
 	if (value_size > MAX_EA_VALUE_SIZE) {
 		cFYI(1, "size of EA value too large");
-		kfree(full_path);
-		FreeXid(xid);
-		return -EOPNOTSUPP;
+		rc = -EOPNOTSUPP;
+		goto set_ea_exit;
 	}
 
 	if (ea_name == NULL) {
@@ -198,6 +206,7 @@ int cifs_setxattr(struct dentry *direntry, const char *ea_name,
 set_ea_exit:
 	kfree(full_path);
 	FreeXid(xid);
+	cifs_put_tlink(tlink);
 #endif
 	return rc;
 }
@@ -209,6 +218,7 @@ ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
 #ifdef CONFIG_CIFS_XATTR
 	int xid;
 	struct cifs_sb_info *cifs_sb;
+	struct tcon_link *tlink;
 	struct cifsTconInfo *pTcon;
 	struct super_block *sb;
 	char *full_path;
@@ -221,16 +231,18 @@ ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
 	if (sb == NULL)
 		return -EIO;
 
-	xid = GetXid();
-
 	cifs_sb = CIFS_SB(sb);
-	pTcon = cifs_sb->tcon;
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	pTcon = tlink_tcon(tlink);
+
+	xid = GetXid();
 
 	full_path = build_path_from_dentry(direntry);
 	if (full_path == NULL) {
 		rc = -ENOMEM;
-		FreeXid(xid);
-		return rc;
+		goto get_ea_exit;
 	}
 	/* return dos attributes as pseudo xattr */
 	/* return alt name if available as pseudo attr */
@@ -323,6 +335,7 @@ ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
 get_ea_exit:
 	kfree(full_path);
 	FreeXid(xid);
+	cifs_put_tlink(tlink);
 #endif
 	return rc;
 }
@@ -333,6 +346,7 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
 #ifdef CONFIG_CIFS_XATTR
 	int xid;
 	struct cifs_sb_info *cifs_sb;
+	struct tcon_link *tlink;
 	struct cifsTconInfo *pTcon;
 	struct super_block *sb;
 	char *full_path;
@@ -346,18 +360,20 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
 		return -EIO;
 
 	cifs_sb = CIFS_SB(sb);
-	pTcon = cifs_sb->tcon;
-
 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 		return -EOPNOTSUPP;
 
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	pTcon = tlink_tcon(tlink);
+
 	xid = GetXid();
 
 	full_path = build_path_from_dentry(direntry);
 	if (full_path == NULL) {
 		rc = -ENOMEM;
-		FreeXid(xid);
-		return rc;
+		goto list_ea_exit;
 	}
 	/* return dos attributes as pseudo xattr */
 	/* return alt name if available as pseudo attr */
@@ -370,8 +386,10 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
 				cifs_sb->mnt_cifs_flags &
 					CIFS_MOUNT_MAP_SPECIAL_CHR);
 
+list_ea_exit:
 	kfree(full_path);
 	FreeXid(xid);
+	cifs_put_tlink(tlink);
 #endif
 	return rc;
 }