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blk: spread blocks across arenas

take into account the qid of the file being written
to, so different workers can flush in parallel when
writing.

--- a/blk.c

+++ b/blk.c

@@ -14,7 +14,7 @@

 #include "atomic.h"

 static vlong	blkalloc_lk(Arena*, int);

-static vlong	blkalloc(int);

+static vlong	blkalloc(int, uint);

 static int	blkdealloc_lk(vlong);

 static Blk*	initblk(Blk*, vlong, vlong, int);

 static int	logop(Arena *, vlong, vlong, int);

@@ -132,11 +132,15 @@

 }

 static Arena*

-pickarena(int hint, int tries)

+pickarena(uint ty, uint hint, int tries)

 {

-	int n;

+	uint n;

-	n = tries + hint + ainc(&fs->roundrobin)/1024;

+	n = hint + tries + ainc(&fs->roundrobin)/1024;

+	if(ty == Tdat)

+		n++;

+	if(hint % fs->narena == 0)

+		n++;

 	return &fs->arenas[n%fs->narena];

 }

@@ -640,7 +644,7 @@

 }

 static vlong

-blkalloc(int hint)

+blkalloc(int ty, uint hint)

 {

 	Arena *a;

 	vlong b;

@@ -648,7 +652,7 @@

 	tries = 0;

 Again:

-	a = pickarena(hint, tries);

+	a = pickarena(ty, hint, tries);

 	if(a == nil || tries == fs->narena){

 		werrstr("no empty arenas");

 		return -1;

@@ -741,12 +745,12 @@

 }

 Blk*

-newblk(Tree *t, int ty)

+newdblk(Tree *t, int ty, vlong hint)

 {

 	vlong bp;

 	Blk *b;

-	if((bp = blkalloc(ty)) == -1)

+	if((bp = blkalloc(ty, hint)) == -1)

 		return nil;

 	if((b = cachepluck()) == nil)

 		return nil;

@@ -753,6 +757,12 @@

 	initblk(b, bp, t->gen, ty);

 	b->alloced = getcallerpc(&t);

 	return b;

+}

+

+Blk*

+newblk(Tree *t, int ty)

+{

+	return newdblk(t, ty, 0);

 }

 Blk*

--- a/fns.h

+++ b/fns.h

@@ -27,8 +27,9 @@

 #define	PACK64(p,v)	do{(p)[0]=(v)>>56;(p)[1]=(v)>>48;(p)[2]=(v)>>40;(p)[3]=(v)>>32;\

 			   (p)[4]=(v)>>24;(p)[5]=(v)>>16;(p)[6]=(v)>>8;(p)[7]=(v);}while(0)

-Blk*	newblk(Tree *t, int type);

-Blk*	dupblk(Tree *t, Blk*);

+Blk*	newdblk(Tree *, int, vlong);

+Blk*	newblk(Tree *, int);

+Blk*	dupblk(Tree *, Blk*);

 Blk*	getroot(Tree*, int*);

 Blk*	getblk(Bptr, int);

 Blk*	holdblk(Blk*);

--- a/fs.c

+++ b/fs.c

@@ -335,7 +335,7 @@

 	if(frozen(f->mnt->root))

 		if(updatesnap(&f->mnt->root, f->mnt->root, f->mnt->name) != nil)

 			return -1;

-	b = newblk(f->mnt->root, Tdat);

+	b = newdblk(f->mnt->root, Tdat, f->qpath);

 	if(b == nil)

 		return -1;

 	t = nil;

-- 

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