Commit 035b448b authored by Peter Maydell's avatar Peter Maydell
Browse files

Merge remote-tracking branch 'remotes/gkurz/tags/9p-next-2020-05-14' into staging 



Changes:
- Christian Schoenebeck is now co-maintainer for 9pfs
- relax checks for O_NOATIME
- minor documentation updates

# gpg: Signature made Thu 14 May 2020 08:14:37 BST
# gpg:                using RSA key B4828BAF943140CEF2A3491071D4D5E5822F73D6
# gpg: Good signature from "Greg Kurz <groug@kaod.org>" [full]
# gpg:                 aka "Gregory Kurz <gregory.kurz@free.fr>" [full]
# gpg:                 aka "[jpeg image of size 3330]" [full]
# Primary key fingerprint: B482 8BAF 9431 40CE F2A3  4910 71D4 D5E5 822F 73D6

* remotes/gkurz/tags/9p-next-2020-05-14:
  xen-9pfs: Fix log messages of reply errors
  9pfs: local: ignore O_NOATIME if we don't have permissions
  qemu-options.hx: 9p: clarify -virtfs vs. -fsdev
  MAINTAINERS: Upgrade myself as 9pfs co-maintainer

Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
parents d8f9d57d 9bbb7e0f

MAINTAINERS

+1 −1
Original line number Diff line number Diff line
@@ -1657,7 +1657,7 @@ F: include/sysemu/balloon.h 


virtio-9p

M: Greg Kurz <groug@kaod.org>

R: Christian Schoenebeck <qemu_oss@crudebyte.com>

M: Christian Schoenebeck <qemu_oss@crudebyte.com>

S: Odd Fixes

F: hw/9pfs/

X: hw/9pfs/xen-9p*

hw/9pfs/9p-util.h

+13 −0
Original line number Diff line number Diff line
@@ -37,9 +37,22 @@ static inline int openat_file(int dirfd, const char *name, int flags, 
{

    int fd, serrno, ret;



again:

    fd = openat(dirfd, name, flags | O_NOFOLLOW | O_NOCTTY | O_NONBLOCK,

                mode);

    if (fd == -1) {

        if (errno == EPERM && (flags & O_NOATIME)) {

            /*

             * The client passed O_NOATIME but we lack permissions to honor it.

             * Rather than failing the open, fall back without O_NOATIME. This

             * doesn't break the semantics on the client side, as the Linux

             * open(2) man page notes that O_NOATIME "may not be effective on

             * all filesystems". In particular, NFS and other network

             * filesystems ignore it entirely.

             */

            flags &= ~O_NOATIME;

            goto again;

        }

        return -1;

    }

hw/9pfs/xen-9p-backend.c

+5 −4
Original line number Diff line number Diff line
@@ -137,7 +137,8 @@ static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu, 
    ret = v9fs_iov_vmarshal(in_sg, num, offset, 0, fmt, ap);

    if (ret < 0) {

        xen_pv_printf(&xen_9pfs->xendev, 0,

                      "Failed to encode VirtFS request type %d\n", pdu->id + 1);

                      "Failed to encode VirtFS reply type %d\n",

                      pdu->id + 1);

        xen_be_set_state(&xen_9pfs->xendev, XenbusStateClosing);

        xen_9pfs_disconnect(&xen_9pfs->xendev);

    }
@@ -201,9 +202,9 @@ static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu, 


    buf_size = iov_size(ring->sg, num);

    if (buf_size  < P9_IOHDRSZ) {

        xen_pv_printf(&xen_9pfs->xendev, 0, "Xen 9pfs request type %d"

                "needs %zu bytes, buffer has %zu, less than minimum\n",

                pdu->id, *size, buf_size);

        xen_pv_printf(&xen_9pfs->xendev, 0, "Xen 9pfs reply type %d needs "

                      "%zu bytes, buffer has %zu, less than minimum\n",

                      pdu->id + 1, *size, buf_size);

        xen_be_set_state(&xen_9pfs->xendev, XenbusStateClosing);

        xen_9pfs_disconnect(&xen_9pfs->xendev);

    }

qemu-options.hx

+11 −3
Original line number Diff line number Diff line
@@ -1542,9 +1542,17 @@ SRST 
``-virtfs proxy,sock_fd=sock_fd,mount_tag=mount_tag [,writeout=writeout][,readonly]``

  \

``-virtfs synth,mount_tag=mount_tag``

    Define a new filesystem device and expose it to the guest using a

    virtio-9p-device. The general form of a Virtual File system

    pass-through options are:

    Define a new virtual filesystem device and expose it to the guest using

    a virtio-9p-device (a.k.a. 9pfs), which essentially means that a certain

    directory on host is made directly accessible by guest as a pass-through

    file system by using the 9P network protocol for communication between

    host and guests, if desired even accessible, shared by several guests

    simultaniously.



    Note that ``-virtfs`` is actually just a convenience shortcut for its

    generalized form ``-fsdev -device virtio-9p-pci``.



    The general form of pass-through file system options are:



    ``local``

        Accesses to the filesystem are done by QEMU.