Re: [Qemu-devel] [PATCH 1/2] virtio-9p: make virtio-9p available to all POSIX systems

["Venkateswararao Jujjuri (JV)" <jvrao@linux.vnet.ibm.com>]

Blue Swirl wrote:
> Field d_off in struct dirent is Linux specific.
> 
> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
> ---
>  Makefile.objs   |    8 ++++----
>  Makefile.target |    2 +-
>  hw/virtio-9p.c  |    2 +-
>  hw/virtio-pci.c |    6 +++---
>  hw/virtio.h     |    4 ++--
>  qemu-config.c   |    4 ++--
>  qemu-config.h   |    2 +-
>  qemu-options.hx |    8 ++++----
>  vl.c            |    8 ++++----
>  9 files changed, 22 insertions(+), 22 deletions(-)
> 
> diff --git a/Makefile.objs b/Makefile.objs
> index 1585101..b1a6e01 100644
> --- a/Makefile.objs
> +++ b/Makefile.objs
> @@ -35,8 +35,8 @@ net-nested-$(CONFIG_SLIRP) += slirp.o
>  net-nested-$(CONFIG_VDE) += vde.o
>  net-obj-y += $(addprefix net/, $(net-nested-y))
> 
> -fsdev-nested-$(CONFIG_LINUX) = qemu-fsdev.o
> -fsdev-obj-$(CONFIG_LINUX) += $(addprefix fsdev/, $(fsdev-nested-y))
> +fsdev-nested-$(CONFIG_POSIX) = qemu-fsdev.o
> +fsdev-obj-$(CONFIG_POSIX) += $(addprefix fsdev/, $(fsdev-nested-y))
> 
>  ######################################################################
>  # libqemu_common.a: Target independent part of system emulation. The
> @@ -47,7 +47,7 @@ fsdev-obj-$(CONFIG_LINUX) += $(addprefix fsdev/,
> $(fsdev-nested-y))
>  common-obj-y = $(block-obj-y)
>  common-obj-y += $(net-obj-y)
>  common-obj-y += $(qobject-obj-y)
> -common-obj-$(CONFIG_LINUX) += $(fsdev-obj-$(CONFIG_LINUX))
> +common-obj-$(CONFIG_POSIX) += $(fsdev-obj-$(CONFIG_POSIX))
>  common-obj-y += readline.o console.o async.o qemu-error.o
>  common-obj-y += tcg-runtime.o host-utils.o
>  common-obj-y += irq.o ioport.o input.o
> @@ -229,7 +229,7 @@ sound-obj-$(CONFIG_CS4231A) += cs4231a.o
>  adlib.o fmopl.o: QEMU_CFLAGS += -DBUILD_Y8950=0
>  hw-obj-$(CONFIG_SOUND) += $(sound-obj-y)
> 
> -hw-obj-$(CONFIG_LINUX) += virtio-9p-debug.o virtio-9p-local.o
> +hw-obj-$(CONFIG_POSIX) += virtio-9p-debug.o virtio-9p-local.o
> 
>  ######################################################################
>  # libdis
> diff --git a/Makefile.target b/Makefile.target
> index fda5bf3..00e140f 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -168,7 +168,7 @@ obj-y += virtio-blk.o virtio-balloon.o
> virtio-net.o virtio-serial-bus.o
>  obj-$(CONFIG_VIRTIO_PCI) += virtio-pci.o
>  obj-y += vhost_net.o
>  obj-$(CONFIG_VHOST_NET) += vhost.o
> -obj-$(CONFIG_LINUX) += virtio-9p.o
> +obj-$(CONFIG_POSIX) += virtio-9p.o
>  obj-y += rwhandler.o
>  obj-$(CONFIG_KVM) += kvm.o kvm-all.o
>  obj-$(CONFIG_NO_KVM) += kvm-stub.o
> diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
> index e5d0112..68b0696 100644
> --- a/hw/virtio-9p.c
> +++ b/hw/virtio-9p.c
> @@ -1447,8 +1447,8 @@ static void v9fs_read_post_dir_lstat(V9fsState
> *s, V9fsReadState *vs,
>      vs->count += vs->len;
>      v9fs_stat_free(&vs->v9stat);
>      v9fs_string_free(&vs->name);
> -    vs->dir_pos = vs->dent->d_off;
>      vs->dent = v9fs_do_readdir(s, vs->fidp->dir);
> +    vs->dir_pos = v9fs_do_telldir(s, vs->fidp->dir);


We need to save the the current dir position before making next readdir
We need to seek back if we can't fit it into PDU.
Hence moving the dir_pos after readdir is not a good idea.

BTW, Thanks for making VirtFS generic to all POSIX systems.

Thanks,
JV.
 
>      v9fs_read_post_readdir(s, vs, err);
>      return;
>  out:
> diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
> index 7ddf612..0a74781 100644
> --- a/hw/virtio-pci.c
> +++ b/hw/virtio-pci.c
> @@ -102,7 +102,7 @@ typedef struct {
>      BlockConf block;
>      NICConf nic;
>      uint32_t host_features;
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>      V9fsConf fsconf;
>  #endif
>      /* Max. number of ports we can have for a the virtio-serial device */
> @@ -642,7 +642,7 @@ static int virtio_balloon_init_pci(PCIDevice *pci_dev)
>      return 0;
>  }
> 
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>  static int virtio_9p_init_pci(PCIDevice *pci_dev)
>  {
>      VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
> @@ -713,7 +713,7 @@ static PCIDeviceInfo virtio_info[] = {
>          },
>          .qdev.reset = virtio_pci_reset,
>      },{
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>          .qdev.name = "virtio-9p-pci",
>          .qdev.size = sizeof(VirtIOPCIProxy),
>          .init      = virtio_9p_init_pci,
> diff --git a/hw/virtio.h b/hw/virtio.h
> index e4306cd..e77af13 100644
> --- a/hw/virtio.h
> +++ b/hw/virtio.h
> @@ -20,7 +20,7 @@
>  #include "sysemu.h"
>  #include "block_int.h"
>  #include "event_notifier.h"
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>  #include "9p.h"
>  #endif
> 
> @@ -188,7 +188,7 @@ VirtIODevice *virtio_blk_init(DeviceState *dev,
> BlockConf *conf);
>  VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf);
>  VirtIODevice *virtio_serial_init(DeviceState *dev, uint32_t max_nr_ports);
>  VirtIODevice *virtio_balloon_init(DeviceState *dev);
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>  VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf);
>  #endif
> 
> diff --git a/qemu-config.c b/qemu-config.c
> index d500885..78e80e3 100644
> --- a/qemu-config.c
> +++ b/qemu-config.c
> @@ -151,7 +151,7 @@ QemuOptsList qemu_chardev_opts = {
>      },
>  };
> 
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>  QemuOptsList qemu_fsdev_opts = {
>      .name = "fsdev",
>      .implied_opt_name = "fstype",
> @@ -169,7 +169,7 @@ QemuOptsList qemu_fsdev_opts = {
>  };
>  #endif
> 
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>  QemuOptsList qemu_virtfs_opts = {
>      .name = "virtfs",
>      .implied_opt_name = "fstype",
> diff --git a/qemu-config.h b/qemu-config.h
> index dca69d4..5376935 100644
> --- a/qemu-config.h
> +++ b/qemu-config.h
> @@ -3,7 +3,7 @@
> 
>  extern QemuOptsList qemu_drive_opts;
>  extern QemuOptsList qemu_chardev_opts;
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>  extern QemuOptsList qemu_fsdev_opts;
>  extern QemuOptsList qemu_virtfs_opts;
>  #endif
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 03e95fd..34ed806 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -475,7 +475,7 @@ possible drivers and properties, use @code{-device ?} and
>  @code{-device @var{driver},?}.
>  ETEXI
> 
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>  DEFHEADING(File system options:)
> 
>  DEF("fsdev", HAS_ARG, QEMU_OPTION_fsdev,
> @@ -499,7 +499,7 @@ Options to each backend are described below.
> 
>  Create a file-system-"device" for local-filesystem.
> 
> -@option{local} is only available on Linux.
> +@option{local} is only available on POSIX systems.
> 
>  @option{path} specifies the path to be exported. @option{path} is required.
> 
> @@ -507,7 +507,7 @@ Create a file-system-"device" for local-filesystem.
>  ETEXI
>  #endif
> 
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>  DEFHEADING(Virtual File system pass-through options:)
> 
>  DEF("virtfs", HAS_ARG, QEMU_OPTION_virtfs,
> @@ -531,7 +531,7 @@ Options to each backend are described below.
> 
>  Create a Virtual file-system-pass through for local-filesystem.
> 
> -@option{local} is only available on Linux.
> +@option{local} is only available on POSIX systems.
> 
>  @option{path} specifies the path to be exported. @option{path} is required.
> 
> diff --git a/vl.c b/vl.c
> index d77b47c..d5c1e34 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -149,7 +149,7 @@ int main(int argc, char **argv)
>  #include "qemu-option.h"
>  #include "qemu-config.h"
>  #include "qemu-objects.h"
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>  #include "fsdev/qemu-fsdev.h"
>  #endif
> 
> @@ -2314,7 +2314,7 @@ static int chardev_init_func(QemuOpts *opts, void *opaque)
>      return 0;
>  }
> 
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>  static int fsdev_init_func(QemuOpts *opts, void *opaque)
>  {
>      int ret;
> @@ -3090,7 +3090,7 @@ int main(int argc, char **argv, char **envp)
>                      exit(1);
>                  }
>                  break;
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>              case QEMU_OPTION_fsdev:
>                  opts = qemu_opts_parse(&qemu_fsdev_opts, optarg, 1);
>                  if (!opts) {
> @@ -3513,7 +3513,7 @@ int main(int argc, char **argv, char **envp)
> 
>      if (qemu_opts_foreach(&qemu_chardev_opts, chardev_init_func, NULL, 1) != 0)
>          exit(1);
> -#ifdef CONFIG_LINUX
> +#ifdef CONFIG_POSIX
>      if (qemu_opts_foreach(&qemu_fsdev_opts, fsdev_init_func, NULL, 1) != 0) {
>          exit(1);
>      }