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Re: [Qemu-devel] [PATCH v3 2/3] 9pfs: use V9fsBlob to transmit xattr
From: |
Aneesh Kumar K.V |
Subject: |
Re: [Qemu-devel] [PATCH v3 2/3] 9pfs: use V9fsBlob to transmit xattr |
Date: |
Mon, 11 Jan 2016 19:56:01 +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 Mon, Jan 11, 2016 at 07:26:39PM +0530, Aneesh Kumar K.V wrote:
> [...]
>> > xattr_len = fidp->fs.xattr.len;
>> > read_count = xattr_len - off;
>> > @@ -1596,14 +1597,18 @@ 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);
>>
>> Can we do this without the malloc and memcpy ? . I am sure you need this
>> for Xen abstraction. But for now i am inclined to drop this from the
>> series and add this later with Xen transport. v9fs_xattr_read is
>> essentially T_READ on a xattr fid and we don't use blob ("B") in other
>> code path. We also want to avoid that extra malloc and memcpy.
>>
>
> That's fine.
>
> Do you want me to resend the whole series or just this one patch
> (assuming you don't have other comments on my other patches)?
>
No. I did this change on top of patch 3
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index a772963fb742..3ff310605cd4 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -1585,6 +1585,8 @@ static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu,
V9fsFidState *fidp,
size_t offset = 7;
int read_count;
int64_t xattr_len;
+ V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
+ VirtQueueElement *elem = &v->elems[pdu->idx];
xattr_len = fidp->fs.xattr.len;
read_count = xattr_len - off;
@@ -1601,7 +1603,8 @@ static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu,
V9fsFidState *fidp,
return err;
}
offset += err;
- err = v9fs_pack(pdu->elem.in_sg, pdu->elem.in_num, offset,
+
+ err = v9fs_pack(elem->in_sg, elem->in_num, offset,
((char *)fidp->fs.xattr.value) + off,
read_count);
if (err < 0) {
[Qemu-devel] [PATCH v3 3/3] 9pfs: introduce V9fsVirtioState, Wei Liu, 2016/01/11
Re: [Qemu-devel] [PATCH v3 0/3] 9pfs: disentangling virtio and generic code, Wei Liu, 2016/01/11