code: mafs

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added Design considerations to the document

--- a/TODO

+++ b/TODO

@@ -17,3 +17,4 @@

 	cat /adm/ctl

 make docs/mafs.ms more interesting?

 test -A announce

+Split out the Free Blocks - Extents section in the document.

--- a/all.h

+++ b/all.h

@@ -88,7 +88,7 @@

 		being stolen by other block numbers.

 		incref(dirties) only happens with a wlock() in putwrite().

 	 */

-	Ref	dirties;	/* number of dirty blocks yet to be written by the writer */

+	Ref	dirties;	/* number of versions of this block yet to be written by the writer */

 };

 extern	u64	nbuckets;		/* n hash buckets for i/o */

--- a/docs/mafs.ms

+++ b/docs/mafs.ms

@@ -1328,6 +1328,15 @@

 .sp

 .sp

 .ft B

+Design considerations

+.ft R

+.sp

+Why are you not using a checksum to verify the contents?

+.br

+Checksums are probabilistic and can be implemented as a bespoke application instead of complicating the filesystem.

+.sp

+.sp

+.ft B

 Source

 .ft R

 .sp