[Virtio-fs] [PATCH 0/3] virtiofsd: Fix lo_flush() and inode->posix_lock init
Laszlo Ersek
lersek at redhat.com
Tue Dec 8 04:51:34 UTC 2020
Hi Vivek,
On 12/07/20 19:30, Vivek Goyal wrote:
> Laszlo is writing a virtiofs client for OVMF and noticed that if he
> sends fuse FLUSH command for directory object, virtiofsd crashes.
> virtiofsd does not expect a FLUSH arriving for a directory object.
>
> This patch series has one of the patches which fixes that. It also
> has couple of posix lock fixes as a result of lo_flush() related debugging.
>
> Vivek Goyal (3):
> virtiofsd: Set up posix_lock hash table for root inode
> virtiofsd: Disable posix_lock hash table if remote locks are not
> enabled
> virtiofsd: Check file type in lo_flush()
>
> tools/virtiofsd/passthrough_ll.c | 54 +++++++++++++++++++++++---------
> 1 file changed, 39 insertions(+), 15 deletions(-)
>
I put back the (wrong) FLUSH for the root dir into my code temporarily, to reproduce the crash (it does, with v5.2.0-rc4).
Then I applied your series [*], and retested.
[*] I'm unsure about the email you sent in response to 1/3, namely <https://lists.gnu.org/archive/html/qemu-devel/2020-12/msg01504.html>; I ignored that when applying the patches.
Indeed now I get a graceful -EBADF:
[13316825985314] [ID: 00000004] unique: 60, opcode: FLUSH (25), nodeid: 1, insize: 64, pid: 1
[13316825993517] [ID: 00000004] unique: 60, error: -9 (Bad file descriptor), outsize: 16
For whichever patch in the series my testing is relevant:
Tested-by: Laszlo Ersek <lersek at redhat.com>
(I'm having some difficulty figuring out which patch(es) should carry my T-b.
- I think I didn't really test patch#2 with the above, so that one should likely not get the T-b
- I think patch#3 is what I really tested.
- But, if that's the case, doesn't patch#3 make the fix in patch#1 untestable, in my scenario? I believe the code is no longer reached in lo_flush(), due to patch#3, where the change from patch#1 would matter. Patch#1 seems correct, and the last paragraph of its commit message relevant, but I think my testing currently only covered patch#3.
I'll let you decide where to apply my T-b.)
Thanks!
Laszlo
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