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Re: [Qemu-devel] [PATCH v2 12/27] 9pfs: use V9fsBlob to transmit xattr
From: |
Aneesh Kumar K.V |
Subject: |
Re: [Qemu-devel] [PATCH v2 12/27] 9pfs: use V9fsBlob to transmit xattr |
Date: |
Sat, 09 Jan 2016 00:18:40 +0530 |
User-agent: |
Notmuch/0.20.2 (http://notmuchmail.org) Emacs/24.5.1 (x86_64-pc-linux-gnu) |
Wei Liu <address@hidden> writes:
> On Fri, Jan 08, 2016 at 02:00:31PM +0530, Aneesh Kumar K.V wrote:
>> Wei Liu <address@hidden> writes:
>>
>> > And make v9fs_pack static function. Now we only need to export
>> > v9fs_{,un}marshal to device.
>> >
>> > Signed-off-by: Wei Liu <address@hidden>
>> > ---
>> > fsdev/virtio-9p-marshal.c | 4 ++--
>> > fsdev/virtio-9p-marshal.h | 3 ---
>> > hw/9pfs/virtio-9p.c | 21 +++++++++++++--------
>> > 3 files changed, 15 insertions(+), 13 deletions(-)
>> >
>> > diff --git a/fsdev/virtio-9p-marshal.c b/fsdev/virtio-9p-marshal.c
>> > index c3ac316..d120bd2 100644
>> > --- a/fsdev/virtio-9p-marshal.c
>> > +++ b/fsdev/virtio-9p-marshal.c
>> > @@ -70,8 +70,8 @@ static ssize_t v9fs_unpack(void *dst, struct iovec
>> > *out_sg, int out_num,
>> > return v9fs_packunpack(dst, out_sg, out_num, offset, size, 0);
>> > }
>> >
>> > -ssize_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset,
>> > - const void *src, size_t size)
>> > +static ssize_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset,
>> > + const void *src, size_t size)
>> > {
>> > return v9fs_packunpack((void *)src, in_sg, in_num, offset, size, 1);
>> > }
>> > diff --git a/fsdev/virtio-9p-marshal.h b/fsdev/virtio-9p-marshal.h
>> > index 0709bcd..766a48e 100644
>> > --- a/fsdev/virtio-9p-marshal.h
>> > +++ b/fsdev/virtio-9p-marshal.h
>> > @@ -3,9 +3,6 @@
>> >
>> > #include "9p-marshal.h"
>> >
>> > -
>> > -ssize_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset,
>> > - const void *src, size_t size);
>> > ssize_t v9fs_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
>> > int bswap, const char *fmt, ...);
>> > ssize_t v9fs_marshal(struct iovec *in_sg, int in_num, size_t offset,
>> > diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c
>> > index 30ff828..654c103 100644
>> > --- a/hw/9pfs/virtio-9p.c
>> > +++ b/hw/9pfs/virtio-9p.c
>> > @@ -1561,6 +1561,7 @@ static int v9fs_xattr_read(V9fsState *s, V9fsPDU
>> > *pdu, V9fsFidState *fidp,
>> > size_t offset = 7;
>> > int read_count;
>> > int64_t xattr_len;
>> > + V9fsBlob blob;
>> >
>> > xattr_len = fidp->fs.xattr.len;
>> > read_count = xattr_len - off;
>> > @@ -1572,14 +1573,18 @@ static int v9fs_xattr_read(V9fsState *s, V9fsPDU
>> > *pdu, V9fsFidState *fidp,
>> > */
>> > read_count = 0;
>> > }
>> > - err = pdu_marshal(pdu, offset, "d", read_count);
>> > - if (err < 0) {
>> > - return err;
>> > - }
>> > - offset += err;
>> > - err = v9fs_pack(pdu->elem.in_sg, pdu->elem.in_num, offset,
>> > - ((char *)fidp->fs.xattr.value) + off,
>> > - read_count);
>> > +
>> > + v9fs_blob_init(&blob);
>> > +
>> > + blob.data = g_malloc(read_count);
>> > + memcpy(blob.data, ((char *)fidp->fs.xattr.value) + off,
>> > + read_count);
>> > + blob.size = read_count;
>> > +
>> > + err = pdu_marshal(pdu, offset, "dB", read_count, &blob);
>>
>> Is this correct ?
>>
>> earlier we had read_count <data>
>> now we have
>> read_count, <blob> which is read_count, blob->size, data
>>
>
> Yes, you're right. There is an error.
>
> The new code should be
>
> err = pdu_marshal(pdu, offset, "B", &blob);
>
> Thanks for your careful review.
>
We would then need 'B' to encode size as int ie, 'd' instead of 'w'
-aneesh
- [Qemu-devel] [PATCH v2 09/27] 9pfs: remove dead code, (continued)
- [Qemu-devel] [PATCH v2 09/27] 9pfs: remove dead code, Wei Liu, 2016/01/07
- [Qemu-devel] [PATCH v2 07/27] 9pfs: rename virtio-9p-xattr{, -user}.{c, h} to 9p-xattr{, -user}.{c, h}, Wei Liu, 2016/01/07
- [Qemu-devel] [PATCH v2 06/27] 9pfs: rename virtio-9p-synth.{c, h} to 9p-synth.{c, h}, Wei Liu, 2016/01/07
- [Qemu-devel] [PATCH v2 02/27] 9pfs: rename virtio-9p-handle.c to 9p-handle.c, Wei Liu, 2016/01/07
- [Qemu-devel] [PATCH v2 05/27] 9pfs: rename virtio-9p-proxy.{c, h} to 9p-proxy.{c, h}, Wei Liu, 2016/01/07
- [Qemu-devel] [PATCH v2 08/27] 9pfs: merge hw/virtio/virtio-9p.h into hw/9pfs/virtio-9p.h, Wei Liu, 2016/01/07
- [Qemu-devel] [PATCH v2 01/27] 9pfs: rename virtio-9p-coth.{c, h} to coth.{c, h}, Wei Liu, 2016/01/07
- [Qemu-devel] [PATCH v2 12/27] 9pfs: use V9fsBlob to transmit xattr, Wei Liu, 2016/01/07
[Qemu-devel] [PATCH v2 10/27] fsdev: break out 9p-marshal.{c, h} from virtio-9p-marshal.{c, h}, Wei Liu, 2016/01/07
[Qemu-devel] [PATCH v2 24/27] 9pfs: rename virtio_9p_set_fd_limit to use v9fs_ prefix, Wei Liu, 2016/01/07
[Qemu-devel] [PATCH v2 26/27] 9pfs: factor out v9fs_device_{, un}realize_common, Wei Liu, 2016/01/07
[Qemu-devel] [PATCH v2 16/27] 9pfs: make pdu_{, un}marshal proper functions, Wei Liu, 2016/01/07
[Qemu-devel] [PATCH v2 14/27] 9pfs: PDU processing functions don't need to take V9fsState as argument, Wei Liu, 2016/01/07
[Qemu-devel] [PATCH v2 13/27] fsdev: rename virtio-9p-marshal.{c, h} to 9p-iov-marshal.{c, h}, Wei Liu, 2016/01/07
[Qemu-devel] [PATCH v2 18/27] 9pfs: factor out pdu_push_and_notify, Wei Liu, 2016/01/07
[Qemu-devel] [PATCH v2 17/27] 9pfs: factor out virtio_pdu_{, un}marshal, Wei Liu, 2016/01/07
[Qemu-devel] [PATCH v2 23/27] 9pfs: move handle_9p_output and make it static function, Wei Liu, 2016/01/07