code: mafs

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fixed bug in sync crash

--- a/dat.h

+++ b/dat.h

@@ -37,7 +37,7 @@

 	Usec	= 1000ULL*1000,

 	Msec	= 1000ULL,

 	Nbkp	= 1,

-	Nrefresh = 10*Nsec,

+	Nrefresh = 3*Nsec,

 };

 /*

--- a/dentry.c

+++ b/dentry.c

@@ -17,9 +17,6 @@

 	b->new->verd++;

 	writeallappend(b, b->new, b->blkno);

 	putbuf(b, 1);

-	freememunits(b->append, Maxdatablockunits);

-	b->append = nil;

-	b->appendsize = 0;

 	return 1;

 }

--- a/iobuf.c

+++ b/iobuf.c

@@ -108,6 +108,7 @@

 	u64 nlocked, i;

 	nlocked = 0;

+Again:

 	for(i = 0; i < nbuckets; i++){

 		hp=&hiob[i];

 		qlock(hp);

@@ -120,7 +121,7 @@

 							qunlock(hp);

 							if(flush(p) == 0)

 								wunlock(p);

-							qlock(hp);

+							goto Again;

 						}else{

 							// cannot be sure about this without a lock

 							// if(p->xiobuf[0] == Tdentry)

--- a/mafs.c

+++ b/mafs.c

@@ -80,7 +80,7 @@

 		and 1/3rd for the buffer cache

 	 */

 	if(nmemunits == 0)

-		nmemunits = size/Blocksize > 1*MiB ? 1*MiB : size/Blocksize;

+		nmemunits = size/Blocksize > 500*KiB ? 500*KiB : size/Blocksize;

 	if(nbuckets == 0)

 		nbuckets = nmemunits/(4*Ncollisions*Maxdatablockunits);

 	if(nbuckets == 0)