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[net/9p] readdir zerocopy changes for 9P2000.L protocol.

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Modify p9_client_readdir() to check the transport preference and act according
If the preference is P9_TRANS_PREF_PAYLOAD_SEP, send the payload
separately instead of putting it directly on PDU.

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Venkateswararao Jujjuri (JV) 2011-02-16 18:43:20 -08:00 committed by Eric Van Hensbergen
parent 1fc52481c2
commit 2c66523fd2
2 changed files with 27 additions and 2 deletions
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11
net/9p/client.c
View File

@ -1735,7 +1735,14 @@ int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
if (count < rsize)
rsize = count;
req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, offset, rsize);
if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
P9_TRANS_PREF_PAYLOAD_SEP) {
req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid,
offset, rsize, data);
} else {
req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
offset, rsize);
}
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
@ -1749,7 +1756,7 @@ int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
if (data)
if (!req->tc->pbuf_size && data)
memmove(data, dataptr, count);
p9_free_req(clnt, req);

18
net/9p/protocol.c
View File

@ -125,6 +125,15 @@ pdu_write_urw(struct p9_fcall *pdu, const char *kdata, const char __user *udata,
return 0;
}
static size_t
pdu_write_readdir(struct p9_fcall *pdu, const char *kdata, size_t size)
{
BUG_ON(pdu->size > P9_READDIRHDRSZ);
pdu->pkbuf = (char *)kdata;
pdu->pbuf_size = size;
return 0;
}
/*
b - int8_t
w - int16_t
@ -466,6 +475,15 @@ p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
errcode = -EFAULT;
}
break;
case 'F':{
int32_t cnt = va_arg(ap, int32_t);
const char *k = va_arg(ap, const void *);
errcode = p9pdu_writef(pdu, proto_version, "d",
cnt);
if (!errcode && pdu_write_readdir(pdu, k, cnt))
errcode = -EFAULT;
}
break;
case 'U':{
int32_t count = va_arg(ap, int32_t);
const char __user *udata =