shithub: gefs

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fs: fix first snapshot generation after mount

When we mount a snap, we want to create a new pending snap so our
writes turn into a new snap instead of modifying the old one.

--- a/fs.c

+++ b/fs.c

@@ -698,6 +698,7 @@

 	Kvp kv;

 	Key dk;

 	Fid f;

+	Tree *t;

 	if((mnt = mallocz(sizeof(Mount), 1)) == nil){

 		rerror(m, Enomem);

@@ -718,10 +719,15 @@

 	}

 	runlock(&fs->userlk);

-	if((mnt->root = openlabel(m->aname)) == nil){

+	if((t = openlabel(m->aname)) == nil){

 		rerror(m, Enosnap);

 		return;

 	}

+	if((mnt->root = newsnap(t)) == nil){

+		rerror(m, Enomem);

+		return;

+	}

+	closesnap(t);

 	if((p = packdkey(dbuf, sizeof(dbuf), -1ULL, "")) == nil){

 		rerror(m, Elength);

--- a/snap.c

+++ b/snap.c

@@ -389,7 +389,7 @@

 	Tree *r;

 	int i;

-	if(modifysnap(Oinsert, t) != nil)

+	if(t->dirty && modifysnap(Oinsert, t) != nil)

 		return nil;

 	if((r = calloc(sizeof(Tree), 1)) == nil)