Commit Graph

12 Commits

Author SHA1 Message Date
Greg Kurz
066eb006b5 9pfs: drop v9fs_register_transport()
No good reasons to do this outside of v9fs_device_realize_common().

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
2018-02-01 21:21:27 +01:00
Greg Kurz
8e71b96c62 9pfs: fix some type definitions
To comply with the QEMU coding style.

Signed-off-by: Greg Kurz <groug@kaod.org>
2018-01-08 11:18:22 +01:00
Stefano Stabellini
e08d1e11ed xen-9pfs: disconnect if buffers are misconfigured
Implement xen_9pfs_disconnect by unbinding the event channels. On
xen_9pfs_free, call disconnect if any event channels haven't been
disconnected.

If the frontend misconfigured the buffers set the backend to "Closing"
and disconnect it. Misconfigurations include requesting a read of more
bytes than available on the ring buffer, or claiming to be writing more
data than available on the ring buffer.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
2017-06-29 15:11:51 +02:00
Greg Kurz
8d37de41ca virtio-9p: break device if buffers are misconfigured
The 9P protocol is transport agnostic: if the guest misconfigured the
buffers, the best we can do is to set the broken flag on the device.

Signed-off-by: Greg Kurz <groug@kaod.org>
2017-06-29 15:11:51 +02:00
Greg Kurz
506f327582 virtio-9p/xen-9p: move 9p specific bits to core 9p code
These bits aren't related to the transport so let's move them to the core
code.

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
2017-05-25 10:30:13 +02:00
Stefano Stabellini
01cd90b641 xen: call qemu_set_cloexec instead of fcntl
Use the common utility function, which contains checks on return values
and first calls F_GETFD as recommended by POSIX.1-2001, instead of
manually calling fcntl.

CID: 1374831

Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
CC: anthony.perard@citrix.com
CC: groug@kaod.org
CC: aneesh.kumar@linux.vnet.ibm.com
CC: Eric Blake <eblake@redhat.com>
2017-05-16 11:51:25 -07:00
Stefano Stabellini
c0c24b9554 xen/9pfs: fix two resource leaks on error paths, discovered by Coverity
CID: 1374836

Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
CC: anthony.perard@citrix.com
CC: groug@kaod.org
CC: aneesh.kumar@linux.vnet.ibm.com
2017-05-16 11:50:30 -07:00
Stefano Stabellini
4476e09e34 xen/9pfs: send responses back to the frontend
Once a request is completed, xen_9pfs_push_and_notify gets called. In
xen_9pfs_push_and_notify, update the indexes (data has already been
copied to the sg by the common code) and send a notification to the
frontend.

Schedule the bottom-half to check if we already have any other requests
pending.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
2017-04-25 11:04:33 -07:00
Stefano Stabellini
40a2389207 xen/9pfs: implement in/out_iov_from_pdu and vmarshal/vunmarshal
Implement xen_9pfs_init_in/out_iov_from_pdu and
xen_9pfs_pdu_vmarshal/vunmarshall by creating new sg pointing to the
data on the ring.

This is safe as we only handle one request per ring at any given time.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
2017-04-25 11:04:33 -07:00
Stefano Stabellini
47b70fb1e4 xen/9pfs: receive requests from the frontend
Upon receiving an event channel notification from the frontend, schedule
the bottom half. From the bottom half, read one request from the ring,
create a pdu and call pdu_submit to handle it.

For now, only handle one request per ring at a time.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
2017-04-25 11:04:33 -07:00
Stefano Stabellini
f23ef34a5d xen/9pfs: connect to the frontend
Write the limits of the backend to xenstore. Connect to the frontend.
Upon connection, allocate the rings according to the protocol
specification.

Initialize a QEMUBH to schedule work upon receiving an event channel
notification from the frontend.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
2017-04-25 11:04:33 -07:00
Stefano Stabellini
b37eeb0201 xen/9pfs: introduce Xen 9pfs backend
Introduce the Xen 9pfs backend: add struct XenDevOps to register as a
Xen backend and add struct V9fsTransport to register as v9fs transport.

All functions are empty stubs for now.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
2017-04-25 11:04:28 -07:00