Implement 1003.1-2001 pathconf() keys.

This is based on r106058 in UFS.

MFC after:	1 month

1 files changed, 44 insertions, 9 deletions

diff --git a/sys/fs/ext2fs/ext2_vnops.c b/sys/fs/ext2fs/ext2_vnops.c
index 0076754..c2f8a8f 100644
--- a/sys/fs/ext2fs/ext2_vnops.c
+++ b/sys/fs/ext2fs/ext2_vnops.c
@@ -1410,33 +1410,68 @@ ext2fifo_kqfilter(struct vop_kqfilter_args *ap)
 static int
 ext2_pathconf(struct vop_pathconf_args *ap)
 {
+	int error = 0;
 
 	switch (ap->a_name) {
 	case _PC_LINK_MAX:
 		*ap->a_retval = EXT2_LINK_MAX;
-		return (0);
+		break;
 	case _PC_NAME_MAX:
 		*ap->a_retval = NAME_MAX;
-		return (0);
+		break;
 	case _PC_PATH_MAX:
 		*ap->a_retval = PATH_MAX;
-		return (0);
+		break;
 	case _PC_PIPE_BUF:
 		*ap->a_retval = PIPE_BUF;
-		return (0);
+		break;
 	case _PC_CHOWN_RESTRICTED:
 		*ap->a_retval = 1;
-		return (0);
+		break;
 	case _PC_NO_TRUNC:
 		*ap->a_retval = 1;
-		return (0);
+		break;
 	case _PC_MIN_HOLE_SIZE:
 		*ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
-		return(0);
+		break;
+	case _PC_ASYNC_IO:
+		/* _PC_ASYNC_IO should have been handled by upper layers. */
+		KASSERT(0, ("_PC_ASYNC_IO should not get here"));
+		error = EINVAL;
+		break;
+	case _PC_PRIO_IO:
+		*ap->a_retval = 0;
+		break;
+	case _PC_SYNC_IO:
+		*ap->a_retval = 0;
+		break;
+	case _PC_ALLOC_SIZE_MIN:
+		*ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
+		break;
+	case _PC_FILESIZEBITS:
+		*ap->a_retval = 64;
+		break;
+	case _PC_REC_INCR_XFER_SIZE:
+		*ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
+		break;
+	case _PC_REC_MAX_XFER_SIZE:
+		*ap->a_retval = -1; /* means ``unlimited'' */
+		break;
+	case _PC_REC_MIN_XFER_SIZE:
+		*ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
+		break;
+	case _PC_REC_XFER_ALIGN:
+		*ap->a_retval = PAGE_SIZE;
+		break;
+	case _PC_SYMLINK_MAX:
+		*ap->a_retval = MAXPATHLEN;
+		break;
+
 	default:
-		return (EINVAL);
+		error = EINVAL;
+		break;
 	}
-	/* NOTREACHED */
+	return (error);
 }
 
 /*