[Qemu-devel] [PATCH -V3 6/8] hw/9pfs: Add directory reclaim support

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 hw/9pfs/virtio-9p.c |   21 +++++++++++++++++++--
 1 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c
index 1fa7256..293a562 100644
--- a/hw/9pfs/virtio-9p.c
+++ b/hw/9pfs/virtio-9p.c
@@ -142,7 +142,12 @@ static int v9fs_do_open(V9fsState *s, V9fsString *path, int flags)
 
 static DIR *v9fs_do_opendir(V9fsState *s, V9fsString *path)
 {
-    return s->ops->opendir(&s->ctx, path->data);
+    DIR *dir;
+    dir = s->ops->opendir(&s->ctx, path->data);
+    if (dirfd(dir) > P9_FD_RECLAIM_THRES) {
+        v9fs_reclaim_fd(s);
+    }
+    return dir;
 }
 
 static void v9fs_do_rewinddir(V9fsState *s, DIR *dir)
@@ -484,6 +489,10 @@ static V9fsFidState *lookup_fid(V9fsState *s, int32_t fid)
                     f->fsmap.fs.fd = v9fs_do_open(s, &f->fsmap.path,
                                                   f->fsmap.open_flags);
                 }
+            } else if (f->fsmap.fid_type == P9_FID_DIR) {
+                if (f->fsmap.fs.dir == NULL) {
+                    f->fsmap.fs.dir = v9fs_do_opendir(s, &f->fsmap.path);
+                }
             }
             /*
              * Mark the fid as referenced so that the LRU
@@ -550,6 +559,12 @@ static void v9fs_reclaim_fd(V9fsState *s)
                 f->fsmap.fs.fd = -1;
                 reclaim_count++;
             }
+        } else if (f->fsmap.fid_type == P9_FID_DIR) {
+            if (f->fsmap.fs.dir != NULL) {
+                v9fs_do_closedir(s, f->fsmap.fs.dir);
+                f->fsmap.fs.dir = NULL;
+                reclaim_count++;
+            }
         }
         if (reclaim_count >= P9_FD_RECLAIM_THRES/2) {
             break;
@@ -633,7 +648,9 @@ static int free_fid(V9fsState *s, int32_t fid)
             v9fs_do_close(s, fidp->fsmap.fs.fd);
         }
     } else if (fidp->fsmap.fid_type == P9_FID_DIR) {
-        v9fs_do_closedir(s, fidp->fsmap.fs.dir);
+        if (fidp->fsmap.fs.dir != NULL) {
+            v9fs_do_closedir(s, fidp->fsmap.fs.dir);
+        }
     } else if (fidp->fsmap.fid_type == P9_FID_XATTR) {
         retval = v9fs_xattr_fid_clunk(s, fidp);
     }
-- 
1.7.1