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ftpfs: no caching by default, add -c flag to enable it (patch by mycroftiv)

--- a/sys/man/4/ftpfs

+++ b/sys/man/4/ftpfs

@@ -4,7 +4,7 @@

 .SH SYNOPSIS

 .B ftpfs

 [

-.B -/dqnt

+.B -/dqntc

 ]

 [

 .B -m

@@ -90,6 +90,10 @@

 To see all messages from the server use option

 .BR -d .

 .PP

+By default ftpfs only caches while a file operation is in progress. The

+.BR -c

+flag enables caching, increasing performance but allowing outdated file and directory data to persist.

+.PP

 Some systems will hangup an ftp connection that has no activity

 for a given period.  The

 .BR -K

@@ -183,13 +187,8 @@

 However, walking to any valid directory on that machine will succeed

 and cause that directory entry to appear under the mount point.

 .PP

-.I Ftpfs

-caches files and directories.  A directory will fall from the cache

-after 5 quiescent minutes or if the local user changes the

-directory by writing or removing a file.

-Otherwise, remote

-changes to the directory that occur after the directory has

-been cached might not be immediately visible.

+If caching is active, remote

+changes that have been cached will not be visible.

 Attempting to walk to

 .IB directory /.flush.ftpfs

 will flush

--- a/sys/src/cmd/ip/ftpfs/ftpfs.c

+++ b/sys/src/cmd/ip/ftpfs/ftpfs.c

@@ -85,6 +85,7 @@

 char *nosuchfile = "file does not exist";

 char *keyspec = "";

+int docache = 0;

 void

 usage(void)

@@ -149,6 +150,9 @@

 	case 'q':

 		quiet = 1;

 		break;

+	case 'c':

+		docache = 1;

+		break;

 	} ARGEND

 	if(argc != 1)

 		usage();

@@ -582,6 +586,8 @@

 		f->node->opens--;

 	}

 	f->busy = 0;

+	if(!docache && ISCACHED(f->node))

+		uncache(f->node);

 	return 0;

 }