[Qemu-devel] [PATCH v2 01/45] block: Attach non-qdev devices as well

[Markus Armbruster]

For now, this just protects against programming errors like having the
same drive back multiple non-qdev devices, or untimely bdrv_delete().
Later commits will add other interesting uses.

While there, rename BlockDriverState member peer to dev, bdrv_attach()
to bdrv_attach_dev(), bdrv_detach() to bdrv_detach_dev(), and
bdrv_get_attached() to bdrv_get_attached_dev().

Signed-off-by: Markus Armbruster <address@hidden>
---
 block.c              |   29 ++++++++++++++++++++---------
 block.h              |    7 ++++---
 block_int.h          |    3 ++-
 blockdev.c           |    5 ++---
 hw/ide/core.c        |    1 +
 hw/ide/piix.c        |    4 ++--
 hw/onenand.c         |    4 +++-
 hw/pflash_cfi01.c    |    1 +
 hw/pflash_cfi02.c    |    1 +
 hw/qdev-properties.c |    6 +++---
 hw/sd.c              |    1 +
 hw/usb-msd.c         |    2 +-
 hw/xen_disk.c        |    1 +
 13 files changed, 42 insertions(+), 23 deletions(-)

diff --git a/block.c b/block.c
index 4826fd8..10a39f1 100644
--- a/block.c
+++ b/block.c
@@ -728,7 +728,7 @@ void bdrv_make_anon(BlockDriverState *bs)
 
 void bdrv_delete(BlockDriverState *bs)
 {
-    assert(!bs->peer);
+    assert(!bs->dev);
 
     /* remove from list, if necessary */
     bdrv_make_anon(bs);
@@ -742,26 +742,37 @@ void bdrv_delete(BlockDriverState *bs)
     qemu_free(bs);
 }
 
-int bdrv_attach(BlockDriverState *bs, DeviceState *qdev)
+int bdrv_attach_dev(BlockDriverState *bs, void *dev)
+/* TODO change to DeviceState *dev when all users are qdevified */
 {
-    if (bs->peer) {
+    if (bs->dev) {
         return -EBUSY;
     }
-    bs->peer = qdev;
+    bs->dev = dev;
     return 0;
 }
 
-void bdrv_detach(BlockDriverState *bs, DeviceState *qdev)
+/* TODO qdevified devices don't use this, remove when devices are qdevified */
+void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev)
 {
-    assert(bs->peer == qdev);
-    bs->peer = NULL;
+    if (bdrv_attach_dev(bs, dev) < 0) {
+        abort();
+    }
+}
+
+void bdrv_detach_dev(BlockDriverState *bs, void *dev)
+/* TODO change to DeviceState *dev when all users are qdevified */
+{
+    assert(bs->dev == dev);
+    bs->dev = NULL;
     bs->change_cb = NULL;
     bs->change_opaque = NULL;
 }
 
-DeviceState *bdrv_get_attached(BlockDriverState *bs)
+/* TODO change to return DeviceState * when all users are qdevified */
+void *bdrv_get_attached_dev(BlockDriverState *bs)
 {
-    return bs->peer;
+    return bs->dev;
 }
 
 /*
diff --git a/block.h b/block.h
index a3bfaaf..a82b0cd 100644
--- a/block.h
+++ b/block.h
@@ -73,9 +73,10 @@ int bdrv_file_open(BlockDriverState **pbs, const char 
*filename, int flags);
 int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
               BlockDriver *drv);
 void bdrv_close(BlockDriverState *bs);
-int bdrv_attach(BlockDriverState *bs, DeviceState *qdev);
-void bdrv_detach(BlockDriverState *bs, DeviceState *qdev);
-DeviceState *bdrv_get_attached(BlockDriverState *bs);
+int bdrv_attach_dev(BlockDriverState *bs, void *dev);
+void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev);
+void bdrv_detach_dev(BlockDriverState *bs, void *dev);
+void *bdrv_get_attached_dev(BlockDriverState *bs);
 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
               uint8_t *buf, int nb_sectors);
 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
diff --git a/block_int.h b/block_int.h
index f6d02b3..cf7b7e7 100644
--- a/block_int.h
+++ b/block_int.h
@@ -167,7 +167,8 @@ struct BlockDriverState {
     BlockDriver *drv; /* NULL means no media */
     void *opaque;
 
-    DeviceState *peer;
+    void *dev;                  /* attached device model, if any */
+    /* TODO change to DeviceState when all users are qdevified */
 
     char filename[1024];
     char backing_file[1024]; /* if non zero, the image is a diff of
diff --git a/blockdev.c b/blockdev.c
index a25367a..40f061a 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -14,7 +14,6 @@
 #include "qemu-option.h"
 #include "qemu-config.h"
 #include "sysemu.h"
-#include "hw/qdev.h"
 #include "block_int.h"
 
 static QTAILQ_HEAD(drivelist, DriveInfo) drives = 
QTAILQ_HEAD_INITIALIZER(drives);
@@ -747,12 +746,12 @@ int do_drive_del(Monitor *mon, const QDict *qdict, 
QObject **ret_data)
     bdrv_flush(bs);
     bdrv_close(bs);
 
-    /* if we have a device associated with this BlockDriverState (bs->peer)
+    /* if we have a device attached to this BlockDriverState
      * then we need to make the drive anonymous until the device
      * can be removed.  If this is a drive with no device backing
      * then we can just get rid of the block driver state right here.
      */
-    if (bs->peer) {
+    if (bdrv_get_attached_dev(bs)) {
         bdrv_make_anon(bs);
     } else {
         drive_uninit(drive_get_by_blockdev(bs));
diff --git a/hw/ide/core.c b/hw/ide/core.c
index d145b19..bcef8bc 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -1865,6 +1865,7 @@ void ide_init2_with_non_qdev_drives(IDEBus *bus, 
DriveInfo *hd0,
                 error_report("Can't set up IDE drive %s", dinfo->id);
                 exit(1);
             }
+            bdrv_attach_dev_nofail(dinfo->bdrv, &bus->ifs[i]);
         } else {
             ide_reset(&bus->ifs[i]);
         }
diff --git a/hw/ide/piix.c b/hw/ide/piix.c
index f527dbd..00fb683 100644
--- a/hw/ide/piix.c
+++ b/hw/ide/piix.c
@@ -162,9 +162,9 @@ static int pci_piix3_xen_ide_unplug(DeviceState *dev)
     for (; i < 3; i++) {
         di = drive_get_by_index(IF_IDE, i);
         if (di != NULL && di->bdrv != NULL && !di->bdrv->removable) {
-            DeviceState *ds = bdrv_get_attached(di->bdrv);
+            DeviceState *ds = bdrv_get_attached_dev(di->bdrv);
             if (ds) {
-                bdrv_detach(di->bdrv, ds);
+                bdrv_detach_dev(di->bdrv, ds);
             }
             bdrv_close(di->bdrv);
             pci_ide->bus[di->bus].ifs[di->unit].bs = NULL;
diff --git a/hw/onenand.c b/hw/onenand.c
index b0cbebc..f2a5f5d 100644
--- a/hw/onenand.c
+++ b/hw/onenand.c
@@ -717,7 +717,9 @@ void *onenand_init(BlockDriverState *bdrv,
     s->iomemtype = cpu_register_io_memory(onenand_readfn,
                     onenand_writefn, s, DEVICE_NATIVE_ENDIAN);
     s->bdrv = bdrv;
-    if (!s->bdrv) {
+    if (s->bdrv) {
+        bdrv_attach_dev_nofail(s->bdrv, s);
+    } else {
         s->image = memset(qemu_malloc(size + (size >> 5)),
                         0xff, size + (size >> 5));
     }
diff --git a/hw/pflash_cfi01.c b/hw/pflash_cfi01.c
index 90fdc84..285e385 100644
--- a/hw/pflash_cfi01.c
+++ b/hw/pflash_cfi01.c
@@ -620,6 +620,7 @@ pflash_t *pflash_cfi01_register(target_phys_addr_t base, 
ram_addr_t off,
             qemu_free(pfl);
             return NULL;
         }
+        bdrv_attach_dev_nofail(pfl->bs, pfl);
     }
 #if 0 /* XXX: there should be a bit to set up read-only,
        *      the same way the hardware does (with WP pin).
diff --git a/hw/pflash_cfi02.c b/hw/pflash_cfi02.c
index 725cd1e..059824d 100644
--- a/hw/pflash_cfi02.c
+++ b/hw/pflash_cfi02.c
@@ -643,6 +643,7 @@ pflash_t *pflash_cfi02_register(target_phys_addr_t base, 
ram_addr_t off,
             qemu_free(pfl);
             return NULL;
         }
+        bdrv_attach_dev_nofail(pfl->bs, pfl);
     }
 #if 0 /* XXX: there should be a bit to set up read-only,
        *      the same way the hardware does (with WP pin).
diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
index eff2d24..f06b317 100644
--- a/hw/qdev-properties.c
+++ b/hw/qdev-properties.c
@@ -312,7 +312,7 @@ static int parse_drive(DeviceState *dev, Property *prop, 
const char *str)
     bs = bdrv_find(str);
     if (bs == NULL)
         return -ENOENT;
-    if (bdrv_attach(bs, dev) < 0)
+    if (bdrv_attach_dev(bs, dev) < 0)
         return -EEXIST;
     *ptr = bs;
     return 0;
@@ -323,7 +323,7 @@ static void free_drive(DeviceState *dev, Property *prop)
     BlockDriverState **ptr = qdev_get_prop_ptr(dev, prop);
 
     if (*ptr) {
-        bdrv_detach(*ptr, dev);
+        bdrv_detach_dev(*ptr, dev);
         blockdev_auto_del(*ptr);
     }
 }
@@ -678,7 +678,7 @@ int qdev_prop_set_drive(DeviceState *dev, const char *name, 
BlockDriverState *va
 {
     int res;
 
-    res = bdrv_attach(value, dev);
+    res = bdrv_attach_dev(value, dev);
     if (res < 0) {
         error_report("Can't attach drive %s to %s.%s: %s",
                      bdrv_get_device_name(value),
diff --git a/hw/sd.c b/hw/sd.c
index c2c80ab..8d42ee2 100644
--- a/hw/sd.c
+++ b/hw/sd.c
@@ -449,6 +449,7 @@ SDState *sd_init(BlockDriverState *bs, int is_spi)
     sd->enable = 1;
     sd_reset(sd, bs);
     if (sd->bdrv) {
+        bdrv_attach_dev_nofail(sd->bdrv, sd);
         bdrv_set_change_cb(sd->bdrv, sd_cardchange, sd);
     }
     return sd;
diff --git a/hw/usb-msd.c b/hw/usb-msd.c
index cdeac58..3edc25c 100644
--- a/hw/usb-msd.c
+++ b/hw/usb-msd.c
@@ -523,7 +523,7 @@ static int usb_msd_initfn(USBDevice *dev)
      *
      * The hack is probably a bad idea.
      */
-    bdrv_detach(bs, &s->dev.qdev);
+    bdrv_detach_dev(bs, &s->dev.qdev);
     s->conf.bs = NULL;
 
     if (!s->serial) {
diff --git a/hw/xen_disk.c b/hw/xen_disk.c
index add815f..89fe824 100644
--- a/hw/xen_disk.c
+++ b/hw/xen_disk.c
@@ -692,6 +692,7 @@ static int blk_init(struct XenDevice *xendev)
         xen_be_printf(&blkdev->xendev, 2, "get configured bdrv (cmdline 
setup)\n");
         blkdev->bs = blkdev->dinfo->bdrv;
     }
+    bdrv_attach_dev_nofail(blkdev->bs, blkdev);
     blkdev->file_blk  = BLOCK_SIZE;
     blkdev->file_size = bdrv_getlength(blkdev->bs);
     if (blkdev->file_size < 0) {
-- 
1.7.6