kern: vfs: Add reclaim callback to vnode

The reclaim callback simply reclaims any filesystem specific resources used with
vnodes back to the operating system.

Signed-off-by: Ian Moffett <ian@osmora.org>

2 files changed, 33 insertions, 0 deletions

diff --git a/src/sys/include/os/vnode.h b/src/sys/include/os/vnode.h
index 9054a55..1bef1e2 100644
--- a/src/sys/include/os/vnode.h
+++ b/src/sys/include/os/vnode.h
@@ -88,6 +88,7 @@ struct vop_rw_data {
  */
 struct vop {
     int(*lookup)(struct vop_lookup_args *args);
+    int(*reclaim)(struct vnode *vp, int flags);
     ssize_t(*write)(struct vop_rw_data *data);
     ssize_t(*read)(struct vop_rw_data *data);
 };
@@ -164,4 +165,15 @@ ssize_t vop_write(struct vnode *vp, char *data, off_t off, size_t len);
  */
 ssize_t vop_read(struct vnode *vp, char *data, off_t off, size_t len);
 
+/*
+ * Reclaim the resources tied to a specific vnode
+ *
+ * @vp: Vnode to reclaim
+ * @flags: Optional flags
+ *
+ * Returns zero on success, otherwise a less than zero value
+ * on failure.
+ */
+int vop_reclaim(struct vnode *vp, int flags);
+
 #endif  /* !_OS_VNODE_H_ */
diff --git a/src/sys/os/vfs_subr.c b/src/sys/os/vfs_subr.c
index a06b64f..6cb7767 100644
--- a/src/sys/os/vfs_subr.c
+++ b/src/sys/os/vfs_subr.c
@@ -203,3 +203,24 @@ vop_read(struct vnode *vp, char *data, off_t off, size_t len)
     rwdata.off = off;
     return vops->read(&rwdata);
 }
+
+int
+vop_reclaim(struct vnode *vp, int flags)
+{
+    struct vop *vops;
+
+    if (vp == NULL) {
+        return -EINVAL;
+    }
+
+    /* Grab the virtual operations */
+    if ((vops = vp->vops) == NULL) {
+        return -EIO;
+    }
+
+    if (vops->reclaim == NULL) {
+        return -ENOTSUP;
+    }
+
+    return vops->reclaim(vp, flags);
+}