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  • Anton Anton anjo
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  1. Jun 25, 2021
  3. Jun 02, 2021
    • Vladimir Sementsov-Ogievskiy's avatar
      block: improve permission conflict error message · 30ebb9aa
      Vladimir Sementsov-Ogievskiy authored 
      
Now permissions are updated as follows:
 1. do graph modifications ignoring permissions
 2. do permission update

 (of course, we rollback [1] if [2] fails)

So, on stage [2] we can't say which users are "old" and which are
"new" and exist only since [1]. And current error message is a bit
outdated. Let's improve it, to make everything clean.

While being here, add also a comment and some good assertions.

iotests 283, 307, qsd-jobs outputs are updated.

Signed-off-by: default avatarVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210601075218.79249-7-vsementsov@virtuozzo.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
      30ebb9aa
    • Vladimir Sementsov-Ogievskiy's avatar
      block: simplify bdrv_child_user_desc() · da261b69
      Vladimir Sementsov-Ogievskiy authored 
      
All child classes have this callback. So, drop unreachable code.

Still add an assertion to bdrv_attach_child_common(), to early detect
bad classes.

Signed-off-by: default avatarVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210601075218.79249-6-vsementsov@virtuozzo.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
      da261b69
    • Vladimir Sementsov-Ogievskiy's avatar
      block: improve bdrv_child_get_parent_desc() · 2c0a3acb
      Vladimir Sementsov-Ogievskiy authored 
      
We have different types of parents: block nodes, block backends and
jobs. So, it makes sense to specify type together with name.

Next, this handler us used to compose an error message about permission
conflict. And permission conflict occurs in a specific place of block
graph. We shouldn't report name of parent device (as it refers another
place in block graph), but exactly and only the name of the node. So,
use bdrv_get_node_name() directly.

iotest 283 output is updated.

Signed-off-by: default avatarVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: default avatarAlberto Garcia <berto@igalia.com>
Message-Id: <20210601075218.79249-4-vsementsov@virtuozzo.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
      2c0a3acb
    • Vladimir Sementsov-Ogievskiy's avatar
      block: document child argument of bdrv_attach_child_common() · f8d2ad78
      Vladimir Sementsov-Ogievskiy authored 
      
The logic around **child is not obvious: this reference is used not
only to return resulting child, but also to rollback NULL value on
transaction abort.

So, let's add documentation and some assertions.

While being here, drop extra declaration of bdrv_attach_child_noperm().

Signed-off-by: default avatarVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210601075218.79249-2-vsementsov@virtuozzo.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
      f8d2ad78
    • Vladimir Sementsov-Ogievskiy's avatar
      block: drop BlockDriverState::read_only · 975da073
      Vladimir Sementsov-Ogievskiy authored 
      
This variable is just a cache for !(bs->open_flags & BDRV_O_RDWR),
which we have to synchronize everywhere. Let's just drop it and
consistently use bdrv_is_read_only().

Signed-off-by: default avatarVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210527154056.70294-3-vsementsov@virtuozzo.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
      975da073
    • Vladimir Sementsov-Ogievskiy's avatar
      block: consistently use bdrv_is_read_only() · 307261b2
      Vladimir Sementsov-Ogievskiy authored 
      
It's better to use accessor function instead of bs->read_only directly.
In some places use bdrv_is_writable() instead of
checking both BDRV_O_RDWR set and BDRV_O_INACTIVE not set.

In bdrv_open_common() it's a bit strange to add one more variable, but
we are going to drop bs->read_only in the next patch, so new ro local
variable substitutes it here.

Signed-off-by: default avatarVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210527154056.70294-2-vsementsov@virtuozzo.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
      307261b2
    • Vladimir Sementsov-Ogievskiy's avatar
      block/vvfat: child_vvfat_qcow: add .get_parent_aio_context, fix crash · fb62b588
      Vladimir Sementsov-Ogievskiy authored 
      
Commit 3ca1f322
"block: BdrvChildClass: add .get_parent_aio_context handler" introduced
new handler and commit 228ca37e
"block: drop ctx argument from bdrv_root_attach_child" made a generic
use of it. But 3ca1f322 didn't update
child_vvfat_qcow. Fix that.

Before that fix the command

./build/qemu-system-x86_64 -usb -device usb-storage,drive=fat16 \
  -drive file=fat:rw:fat-type=16:"<path of a host folder>",id=fat16,format=raw,if=none

crashes:

1  bdrv_child_get_parent_aio_context (c=0x559d62426d20)
    at ../block.c:1440
2  bdrv_attach_child_common
    (child_bs=0x559d62468190, child_name=0x559d606f9e3d "write-target",
     child_class=0x559d60c58d20 <child_vvfat_qcow>, child_role=3,
     perm=3, shared_perm=4, opaque=0x559d62445690,
     child=0x7ffc74c2acc8, tran=0x559d6246ddd0, errp=0x7ffc74c2ae60)
    at ../block.c:2795
3  bdrv_attach_child_noperm
    (parent_bs=0x559d62445690, child_bs=0x559d62468190,
     child_name=0x559d606f9e3d "write-target",
     child_class=0x559d60c58d20 <child_vvfat_qcow>, child_role=3,
     child=0x7ffc74c2acc8, tran=0x559d6246ddd0, errp=0x7ffc74c2ae60) at
    ../block.c:2855
4  bdrv_attach_child
    (parent_bs=0x559d62445690, child_bs=0x559d62468190,
     child_name=0x559d606f9e3d "write-target",
     child_class=0x559d60c58d20 <child_vvfat_qcow>, child_role=3,
     errp=0x7ffc74c2ae60) at ../block.c:2953
5  bdrv_open_child
    (filename=0x559d62464b80 "/var/tmp/vl.h3TIS4",
     options=0x559d6246ec20, bdref_key=0x559d606f9e3d "write-target",
     parent=0x559d62445690, child_class=0x559d60c58d20
     <child_vvfat_qcow>, child_role=3, allow_none=false,
     errp=0x7ffc74c2ae60) at ../block.c:3351
6  enable_write_target (bs=0x559d62445690, errp=0x7ffc74c2ae60) at
   ../block/vvfat.c:3176
7  vvfat_open (bs=0x559d62445690, options=0x559d6244adb0, flags=155650,
               errp=0x7ffc74c2ae60) at ../block/vvfat.c:1236
8  bdrv_open_driver (bs=0x559d62445690, drv=0x559d60d4f7e0
                     <bdrv_vvfat>, node_name=0x0,
                     options=0x559d6244adb0, open_flags=155650,
                     errp=0x7ffc74c2af70) at ../block.c:1557
9  bdrv_open_common (bs=0x559d62445690, file=0x0,
                     options=0x559d6244adb0, errp=0x7ffc74c2af70) at
...

(gdb) fr 1
 #1  0x0000559d603ea3bf in bdrv_child_get_parent_aio_context
     (c=0x559d62426d20) at ../block.c:1440
1440        return c->klass->get_parent_aio_context(c);
 (gdb) p c->klass
$1 = (const BdrvChildClass *) 0x559d60c58d20 <child_vvfat_qcow>
 (gdb) p c->klass->get_parent_aio_context
$2 = (AioContext *(*)(BdrvChild *)) 0x0

Fixes: 3ca1f322
Fixes: 228ca37e
Reported-by: default avatarJohn Arbuckle <programmingkidx@gmail.com>
Signed-off-by: default avatarVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210524101257.119377-2-vsementsov@virtuozzo.com>
Tested-by: default avatarJohn Arbuckle <programmingkidx@gmail.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
      fb62b588
  5. May 18, 2021
  7. May 14, 2021
  9. May 02, 2021
  11. Apr 30, 2021