kernel: fix stat bugs

In a few places, we where using a fixed buffer of sizeof(Dir)+100
size for stat. This is not correct and fails if the name returned
in stat is long.

This results in being unable to seek to the end of file with a
long filename.

The kernel should do the same thing as dirfstat() from libc;
handling the conversion and buffer allocation and returning a
freeable Dir* pointer.

For this, a new dirchanstat() function was added.

The fstat syscall was not rewriting the name to the last path
element; fix it.

In addition, gracefully handle the mountfix case, reallocating
the buffer to accomidate the required stat length plus
size of the new name so dirsetname() does not fail.

1 files changed, 7 insertions, 10 deletions

diff --git a/sys/src/9/port/devswap.c b/sys/src/9/port/devswap.c
index fe872057e..d0d8156b9 100644
--- a/sys/src/9/port/devswap.c
+++ b/sys/src/9/port/devswap.c
@@ -383,10 +383,6 @@ needpages(void*)
 static void
 setswapchan(Chan *c)
 {
-	uchar buf[sizeof(Dir)+100];
-	Dir d;
-	int n;
-
 	if(waserror()){
 		cclose(c);
 		nexterror();
@@ -403,16 +399,17 @@ setswapchan(Chan *c)
 	 *  to be at most the size of the partition
 	 */
 	if(devtab[c->type]->dc != L'M'){
-		n = devtab[c->type]->stat(c, buf, sizeof buf);
-		if(n <= 0 || convM2D(buf, n, &d, nil) == 0)
-			error("stat failed in setswapchan");
-		if(d.length < (vlong)conf.nswppo*BY2PG)
+		Dir *d = dirchanstat(c);
+		if(d->length < (vlong)conf.nswppo*BY2PG){
+			free(d);
 			error("swap device too small");
-		if(d.length < (vlong)conf.nswap*BY2PG){
-			conf.nswap = d.length/BY2PG;
+		}
+		if(d->length < (vlong)conf.nswap*BY2PG){
+			conf.nswap = d->length/BY2PG;
 			swapalloc.top = &swapalloc.swmap[conf.nswap];
 			swapalloc.free = conf.nswap;
 		}
+		free(d);
 	}
 	c->flag &= ~CCACHE;
 	cclunk(c);