[v7,7/9] qcow2: Resize the cache upon image resizing

Message ID 20180810062647.23211-8-lbloch@janustech.com
State New
Headers show
Series
  • Take the image size into account when allocating the L2 cache
Related show

Commit Message

Leonid Bloch Aug. 10, 2018, 6:26 a.m.
The caches are now recalculated upon image resizing. This is done
because the new default behavior of assigning L2 cache relatively to
the image size, implies that the cache will be adapted accordingly
after an image resize.

Signed-off-by: Leonid Bloch <lbloch@janustech.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
 block/qcow2.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

Patch

diff --git a/block/qcow2.c b/block/qcow2.c
index 434fb89076..ba4dfae735 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3418,6 +3418,7 @@  static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset,
     uint64_t old_length;
     int64_t new_l1_size;
     int ret;
+    QDict *options;
 
     if (prealloc != PREALLOC_MODE_OFF && prealloc != PREALLOC_MODE_METADATA &&
         prealloc != PREALLOC_MODE_FALLOC && prealloc != PREALLOC_MODE_FULL)
@@ -3642,6 +3643,8 @@  static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset,
         }
     }
 
+    bs->total_sectors = offset / BDRV_SECTOR_SIZE;
+
     /* write updated header.size */
     offset = cpu_to_be64(offset);
     ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size),
@@ -3652,6 +3655,13 @@  static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset,
     }
 
     s->l1_vm_state_index = new_l1_size;
+
+    /* Update cache sizes */
+    options = qdict_clone_shallow(bs->options);
+    ret = qcow2_update_options(bs, options, s->flags, errp);
+    if (ret < 0) {
+        goto fail;
+    }
     ret = 0;
 fail:
     qemu_co_mutex_unlock(&s->lock);