Merge tag 'v6.11-rc4-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fixes from Steve French:

 - fix refcount leak (can cause rmmod fail)

 - fix byte range locking problem with cached reads

 - fix for mount failure if reparse point unrecognized

 - minor typo

* tag 'v6.11-rc4-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  smb/client: fix typo: GlobalMid_Sem -> GlobalMid_Lock
  smb: client: ignore unhandled reparse tags
  smb3: fix problem unloading module due to leaked refcount on shutdown
  smb3: fix broken cached reads when posix locks

Author: torvalds

fs/smb/client/cifsfs.c

@@ -75,9 +75,9 @@ unsigned int sign_CIFS_PDUs = 1;
 /*
  * Global transaction id (XID) information
  */
-unsigned int GlobalCurrentXid;	/* protected by GlobalMid_Sem */
-unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
-unsigned int GlobalMaxActiveXid;	/* prot by GlobalMid_Sem */
+unsigned int GlobalCurrentXid;	/* protected by GlobalMid_Lock */
+unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Lock */
+unsigned int GlobalMaxActiveXid;	/* prot by GlobalMid_Lock */
 spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */
 
 /*

fs/smb/client/cifsglob.h

@@ -2017,9 +2017,9 @@ extern spinlock_t		cifs_tcp_ses_lock;
 /*
  * Global transaction id (XID) information
  */
-extern unsigned int GlobalCurrentXid;	/* protected by GlobalMid_Sem */
-extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
-extern unsigned int GlobalMaxActiveXid;	/* prot by GlobalMid_Sem */
+extern unsigned int GlobalCurrentXid;	/* protected by GlobalMid_Lock */
+extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Lock */
+extern unsigned int GlobalMaxActiveXid;	/* prot by GlobalMid_Lock */
 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */
 
 /*

fs/smb/client/connect.c

@@ -4194,6 +4194,9 @@ tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
  *
  * If one doesn't exist then insert a new tcon_link struct into the tree and
  * try to construct a new one.
+ *
+ * REMEMBER to call cifs_put_tlink() after successful calls to cifs_sb_tlink,
+ * to avoid refcount issues
  */
 struct tcon_link *
 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)

fs/smb/client/file.c

@@ -2912,9 +2912,7 @@ cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to)
 	if (!CIFS_CACHE_READ(cinode))
 		return netfs_unbuffered_read_iter(iocb, to);
 
-	if (cap_unix(tcon->ses) &&
-	    (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
-	    ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) {
+	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0) {
 		if (iocb->ki_flags & IOCB_DIRECT)
 			return netfs_unbuffered_read_iter(iocb, to);
 		return netfs_buffered_read_iter(iocb, to);

fs/smb/client/ioctl.c

@@ -229,9 +229,11 @@ static int cifs_shutdown(struct super_block *sb, unsigned long arg)
 
 shutdown_good:
 	trace_smb3_shutdown_done(flags, tcon->tid);
+	cifs_put_tlink(tlink);
 	return 0;
 shutdown_out_err:
 	trace_smb3_shutdown_err(rc, flags, tcon->tid);
+	cifs_put_tlink(tlink);
 	return rc;
 }
 

fs/smb/client/link.c

@@ -588,6 +588,7 @@ cifs_symlink(struct mnt_idmap *idmap, struct inode *inode,
 	tlink = cifs_sb_tlink(cifs_sb);
 	if (IS_ERR(tlink)) {
 		rc = PTR_ERR(tlink);
+		/* BB could be clearer if skipped put_tlink on error here, but harmless */
 		goto symlink_exit;
 	}
 	pTcon = tlink_tcon(tlink);

fs/smb/client/reparse.c

@@ -378,6 +378,8 @@ int parse_reparse_point(struct reparse_data_buffer *buf,
 			u32 plen, struct cifs_sb_info *cifs_sb,
 			bool unicode, struct cifs_open_info_data *data)
 {
+	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+
 	data->reparse.buf = buf;
 
 	/* See MS-FSCC 2.1.2 */
@@ -394,12 +396,13 @@ int parse_reparse_point(struct reparse_data_buffer *buf,
 	case IO_REPARSE_TAG_LX_FIFO:
 	case IO_REPARSE_TAG_LX_CHR:
 	case IO_REPARSE_TAG_LX_BLK:
-		return 0;
+		break;
 	default:
-		cifs_dbg(VFS, "%s: unhandled reparse tag: 0x%08x\n",
-			 __func__, le32_to_cpu(buf->ReparseTag));
-		return -EOPNOTSUPP;
+		cifs_tcon_dbg(VFS | ONCE, "unhandled reparse tag: 0x%08x\n",
+			      le32_to_cpu(buf->ReparseTag));
+		break;
 	}
+	return 0;
 }
 
 int smb2_parse_reparse_point(struct cifs_sb_info *cifs_sb,