1 files changed, 36 insertions, 6 deletions

diff --git a/sys/fs/tmpfs.c b/sys/fs/tmpfs.c
index 9dce89a..a6e40e1 100644
--- a/sys/fs/tmpfs.c
+++ b/sys/fs/tmpfs.c
@@ -211,6 +211,8 @@ tmpfs_create(struct vop_create_args *args)
     root_np = TAILQ_FIRST(&root);
     np->dirvp = dirvp;
     np->type = TMPFS_REG;
+    np->real_size = 0;
+    np->mode = 0700;
     memcpy(np->rpath, pcp, strlen(pcp) + 1);
     TAILQ_INSERT_TAIL(&root_np->dirents, np, link);
 
@@ -269,6 +271,14 @@ tmpfs_write(struct vnode *vp, struct sio_txn *sio)
     }
 
     /*
+     * Bring up the real size if we are writing
+     * more bytes.
+     */
+    if (sio->offset >= np->real_size) {
+        np->real_size = sio->offset;
+    }
+
+    /*
      * If the length to be written exceeds the residual byte
      * count. We will try to expand the buffer by the page
      * size. However, if this fails, we will split the write
@@ -287,7 +297,6 @@ tmpfs_write(struct vnode *vp, struct sio_txn *sio)
     buf = np->data;
     memcpy(&buf[sio->offset], sio->buf, sio->len);
     spinlock_release(&np->lock);
-    kprintf("%d\n", sio->len);
     return sio->len;
 }
 
@@ -316,12 +325,9 @@ tmpfs_read(struct vnode *vp, struct sio_txn *sio)
 
     spinlock_acquire(&np->lock);
 
-    if (sio->offset > np->len - 1) {
+    if (sio->offset > np->real_size) {
         return -EINVAL;
     }
-    if ((sio->offset + sio->len) > np->len) {
-        sio->len = np->len;
-    }
 
     buf = np->data;
     memcpy(sio->buf, &buf[sio->offset], sio->len);
@@ -329,6 +335,30 @@ tmpfs_read(struct vnode *vp, struct sio_txn *sio)
     return sio->len;
 }
 
+/*
+ * TMPFS get attribute callback for VFS
+ */
+static int
+tmpfs_getattr(struct vop_getattr_args *args)
+{
+    struct vnode *vp;
+    struct tmpfs_node *np;
+    struct vattr attr;
+
+    if ((vp = args->vp) == NULL) {
+        return -EIO;
+    }
+    if ((np = vp->data) == NULL) {
+        return -EIO;
+    }
+
+    memset(&attr, VNOVAL, sizeof(attr));
+    attr.size = np->real_size;
+    attr.mode = np->mode;
+    *args->res = attr;
+    return 0;
+}
+
 static int
 tmpfs_reclaim(struct vnode *vp)
 {
@@ -378,7 +408,7 @@ tmpfs_init(struct fs_info *fip)
 
 const struct vops g_tmpfs_vops = {
     .lookup = tmpfs_lookup,
-    .getattr = NULL,
+    .getattr = tmpfs_getattr,
     .read = tmpfs_read,
     .write = tmpfs_write,
     .reclaim = tmpfs_reclaim,