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-rw-r--r--net/9p/client.c134
-rw-r--r--net/9p/protocol.c75
-rw-r--r--net/9p/protocol.h6
-rw-r--r--net/9p/trans_fd.c1
-rw-r--r--net/9p/trans_rdma.c1
-rw-r--r--net/9p/trans_virtio.c143
-rw-r--r--net/9p/util.c1
7 files changed, 245 insertions, 116 deletions
diff --git a/net/9p/client.c b/net/9p/client.c
index 09d4f1e2e4a..0aa79faa985 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -29,6 +29,7 @@
#include <linux/poll.h>
#include <linux/idr.h>
#include <linux/mutex.h>
+#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <net/9p/9p.h>
@@ -46,6 +47,7 @@ enum {
Opt_msize,
Opt_trans,
Opt_legacy,
+ Opt_version,
Opt_err,
};
@@ -53,9 +55,43 @@ static const match_table_t tokens = {
{Opt_msize, "msize=%u"},
{Opt_legacy, "noextend"},
{Opt_trans, "trans=%s"},
+ {Opt_version, "version=%s"},
{Opt_err, NULL},
};
+inline int p9_is_proto_dotl(struct p9_client *clnt)
+{
+ return (clnt->proto_version == p9_proto_2000L);
+}
+EXPORT_SYMBOL(p9_is_proto_dotl);
+
+inline int p9_is_proto_dotu(struct p9_client *clnt)
+{
+ return (clnt->proto_version == p9_proto_2000u);
+}
+EXPORT_SYMBOL(p9_is_proto_dotu);
+
+/* Interpret mount option for protocol version */
+static int get_protocol_version(const substring_t *name)
+{
+ int version = -EINVAL;
+
+ if (!strncmp("9p2000", name->from, name->to-name->from)) {
+ version = p9_proto_legacy;
+ P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
+ } else if (!strncmp("9p2000.u", name->from, name->to-name->from)) {
+ version = p9_proto_2000u;
+ P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
+ } else if (!strncmp("9p2000.L", name->from, name->to-name->from)) {
+ version = p9_proto_2000L;
+ P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
+ } else {
+ P9_DPRINTK(P9_DEBUG_ERROR, "Unknown protocol version %s. ",
+ name->from);
+ }
+ return version;
+}
+
static struct p9_req_t *
p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
@@ -75,7 +111,7 @@ static int parse_opts(char *opts, struct p9_client *clnt)
int option;
int ret = 0;
- clnt->dotu = 1;
+ clnt->proto_version = p9_proto_2000u;
clnt->msize = 8192;
if (!opts)
@@ -118,7 +154,13 @@ static int parse_opts(char *opts, struct p9_client *clnt)
}
break;
case Opt_legacy:
- clnt->dotu = 0;
+ clnt->proto_version = p9_proto_legacy;
+ break;
+ case Opt_version:
+ ret = get_protocol_version(&args[0]);
+ if (ret == -EINVAL)
+ goto free_and_return;
+ clnt->proto_version = ret;
break;
default:
continue;
@@ -410,14 +452,15 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
int ecode;
char *ename;
- err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
+ err = p9pdu_readf(req->rc, c->proto_version, "s?d",
+ &ename, &ecode);
if (err) {
P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
err);
return err;
}
- if (c->dotu)
+ if (p9_is_proto_dotu(c))
err = -ecode;
if (!err || !IS_ERR_VALUE(err))
@@ -492,7 +535,12 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
- if (c->status != Connected)
+ /* we allow for any status other than disconnected */
+ if (c->status == Disconnected)
+ return ERR_PTR(-EIO);
+
+ /* if status is begin_disconnected we allow only clunk request */
+ if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
return ERR_PTR(-EIO);
if (signal_pending(current)) {
@@ -515,7 +563,7 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
/* marshall the data */
p9pdu_prepare(req->tc, tag, type);
va_start(ap, fmt);
- err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
+ err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
va_end(ap);
p9pdu_finalize(req->tc);
@@ -627,14 +675,31 @@ int p9_client_version(struct p9_client *c)
char *version;
int msize;
- P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n",
- c->msize, c->dotu);
- req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize,
- c->dotu ? "9P2000.u" : "9P2000");
+ P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
+ c->msize, c->proto_version);
+
+ switch (c->proto_version) {
+ case p9_proto_2000L:
+ req = p9_client_rpc(c, P9_TVERSION, "ds",
+ c->msize, "9P2000.L");
+ break;
+ case p9_proto_2000u:
+ req = p9_client_rpc(c, P9_TVERSION, "ds",
+ c->msize, "9P2000.u");
+ break;
+ case p9_proto_legacy:
+ req = p9_client_rpc(c, P9_TVERSION, "ds",
+ c->msize, "9P2000");
+ break;
+ default:
+ return -EINVAL;
+ break;
+ }
+
if (IS_ERR(req))
return PTR_ERR(req);
- err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version);
+ err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
if (err) {
P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
p9pdu_dump(1, req->rc);
@@ -642,10 +707,12 @@ int p9_client_version(struct p9_client *c)
}
P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
- if (!memcmp(version, "9P2000.u", 8))
- c->dotu = 1;
- else if (!memcmp(version, "9P2000", 6))
- c->dotu = 0;
+ if (!strncmp(version, "9P2000.L", 8))
+ c->proto_version = p9_proto_2000L;
+ else if (!strncmp(version, "9P2000.u", 8))
+ c->proto_version = p9_proto_2000u;
+ else if (!strncmp(version, "9P2000", 6))
+ c->proto_version = p9_proto_legacy;
else {
err = -EREMOTEIO;
goto error;
@@ -700,8 +767,8 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
goto put_trans;
}
- P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
- clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
+ P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
+ clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
err = clnt->trans_mod->create(clnt, dev_name, options);
if (err)
@@ -739,8 +806,10 @@ void p9_client_destroy(struct p9_client *clnt)
v9fs_put_trans(clnt->trans_mod);
- list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
+ list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
+ printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
p9_fid_destroy(fid);
+ }
if (clnt->fidpool)
p9_idpool_destroy(clnt->fidpool);
@@ -758,6 +827,13 @@ void p9_client_disconnect(struct p9_client *clnt)
}
EXPORT_SYMBOL(p9_client_disconnect);
+void p9_client_begin_disconnect(struct p9_client *clnt)
+{
+ P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
+ clnt->status = BeginDisconnect;
+}
+EXPORT_SYMBOL(p9_client_begin_disconnect);
+
struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
char *uname, u32 n_uname, char *aname)
{
@@ -784,7 +860,7 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
if (err) {
p9pdu_dump(1, req->rc);
p9_free_req(clnt, req);
@@ -833,7 +909,7 @@ p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
if (err) {
p9pdu_dump(1, req->rc);
p9_free_req(clnt, req);
@@ -891,7 +967,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
if (err) {
p9pdu_dump(1, req->rc);
p9_free_req(clnt, req);
@@ -952,7 +1028,7 @@ int p9_client_open(struct p9_fid *fid, int mode)
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
if (err) {
p9pdu_dump(1, req->rc);
goto free_and_error;
@@ -997,7 +1073,7 @@ int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
if (err) {
p9pdu_dump(1, req->rc);
goto free_and_error;
@@ -1098,7 +1174,7 @@ p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
if (err) {
p9pdu_dump(1, req->rc);
goto free_and_error;
@@ -1159,7 +1235,7 @@ p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "d", &count);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
if (err) {
p9pdu_dump(1, req->rc);
goto free_and_error;
@@ -1199,7 +1275,7 @@ struct p9_wstat *p9_client_stat(struct p9_fid *fid)
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
if (err) {
p9pdu_dump(1, req->rc);
p9_free_req(clnt, req);
@@ -1226,7 +1302,7 @@ error:
}
EXPORT_SYMBOL(p9_client_stat);
-static int p9_client_statsize(struct p9_wstat *wst, int optional)
+static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
{
int ret;
@@ -1245,7 +1321,7 @@ static int p9_client_statsize(struct p9_wstat *wst, int optional)
if (wst->muid)
ret += strlen(wst->muid);
- if (optional) {
+ if (proto_version == p9_proto_2000u) {
ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
if (wst->extension)
ret += strlen(wst->extension);
@@ -1262,7 +1338,7 @@ int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
err = 0;
clnt = fid->clnt;
- wst->size = p9_client_statsize(wst, clnt->dotu);
+ wst->size = p9_client_statsize(wst, clnt->proto_version);
P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
P9_DPRINTK(P9_DEBUG_9P,
" sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
diff --git a/net/9p/protocol.c b/net/9p/protocol.c
index fc70147c771..e7541d5b011 100644
--- a/net/9p/protocol.c
+++ b/net/9p/protocol.c
@@ -28,6 +28,7 @@
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/uaccess.h>
+#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <net/9p/9p.h>
@@ -52,7 +53,7 @@
#endif
static int
-p9pdu_writef(struct p9_fcall *pdu, int optional, const char *fmt, ...);
+p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...);
#ifdef CONFIG_NET_9P_DEBUG
void
@@ -144,7 +145,8 @@ pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size)
*/
static int
-p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
+p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt,
+ va_list ap)
{
const char *ptr;
int errcode = 0;
@@ -194,7 +196,8 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
int16_t len;
int size;
- errcode = p9pdu_readf(pdu, optional, "w", &len);
+ errcode = p9pdu_readf(pdu, proto_version,
+ "w", &len);
if (errcode)
break;
@@ -217,7 +220,7 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
struct p9_qid *qid =
va_arg(ap, struct p9_qid *);
- errcode = p9pdu_readf(pdu, optional, "bdq",
+ errcode = p9pdu_readf(pdu, proto_version, "bdq",
&qid->type, &qid->version,
&qid->path);
}
@@ -230,7 +233,7 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
stbuf->n_uid = stbuf->n_gid = stbuf->n_muid =
-1;
errcode =
- p9pdu_readf(pdu, optional,
+ p9pdu_readf(pdu, proto_version,
"wwdQdddqssss?sddd",
&stbuf->size, &stbuf->type,
&stbuf->dev, &stbuf->qid,
@@ -250,7 +253,7 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
void **data = va_arg(ap, void **);
errcode =
- p9pdu_readf(pdu, optional, "d", count);
+ p9pdu_readf(pdu, proto_version, "d", count);
if (!errcode) {
*count =
MIN(*count,
@@ -263,8 +266,8 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
int16_t *nwname = va_arg(ap, int16_t *);
char ***wnames = va_arg(ap, char ***);
- errcode =
- p9pdu_readf(pdu, optional, "w", nwname);
+ errcode = p9pdu_readf(pdu, proto_version,
+ "w", nwname);
if (!errcode) {
*wnames =
kmalloc(sizeof(char *) * *nwname,
@@ -278,7 +281,8 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
for (i = 0; i < *nwname; i++) {
errcode =
- p9pdu_readf(pdu, optional,
+ p9pdu_readf(pdu,
+ proto_version,
"s",
&(*wnames)[i]);
if (errcode)
@@ -306,7 +310,7 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
*wqids = NULL;
errcode =
- p9pdu_readf(pdu, optional, "w", nwqid);
+ p9pdu_readf(pdu, proto_version, "w", nwqid);
if (!errcode) {
*wqids =
kmalloc(*nwqid *
@@ -321,7 +325,8 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
for (i = 0; i < *nwqid; i++) {
errcode =
- p9pdu_readf(pdu, optional,
+ p9pdu_readf(pdu,
+ proto_version,
"Q",
&(*wqids)[i]);
if (errcode)
@@ -336,7 +341,7 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
}
break;
case '?':
- if (!optional)
+ if (proto_version != p9_proto_2000u)
return 0;
break;
default:
@@ -352,7 +357,8 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
}
int
-p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
+p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
+ va_list ap)
{
const char *ptr;
int errcode = 0;
@@ -389,7 +395,8 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
if (sptr)
len = MIN(strlen(sptr), USHORT_MAX);
- errcode = p9pdu_writef(pdu, optional, "w", len);
+ errcode = p9pdu_writef(pdu, proto_version,
+ "w", len);
if (!errcode && pdu_write(pdu, sptr, len))
errcode = -EFAULT;
}
@@ -398,7 +405,7 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
const struct p9_qid *qid =
va_arg(ap, const struct p9_qid *);
errcode =
- p9pdu_writef(pdu, optional, "bdq",
+ p9pdu_writef(pdu, proto_version, "bdq",
qid->type, qid->version,
qid->path);
} break;
@@ -406,7 +413,7 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
const struct p9_wstat *stbuf =
va_arg(ap, const struct p9_wstat *);
errcode =
- p9pdu_writef(pdu, optional,
+ p9pdu_writef(pdu, proto_version,
"wwdQdddqssss?sddd",
stbuf->size, stbuf->type,
stbuf->dev, &stbuf->qid,
@@ -421,8 +428,8 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
int32_t count = va_arg(ap, int32_t);
const void *data = va_arg(ap, const void *);
- errcode =
- p9pdu_writef(pdu, optional, "d", count);
+ errcode = p9pdu_writef(pdu, proto_version, "d",
+ count);
if (!errcode && pdu_write(pdu, data, count))
errcode = -EFAULT;
}
@@ -431,8 +438,8 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
int32_t count = va_arg(ap, int32_t);
const char __user *udata =
va_arg(ap, const void __user *);
- errcode =
- p9pdu_writef(pdu, optional, "d", count);
+ errcode = p9pdu_writef(pdu, proto_version, "d",
+ count);
if (!errcode && pdu_write_u(pdu, udata, count))
errcode = -EFAULT;
}
@@ -441,14 +448,15 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
int16_t nwname = va_arg(ap, int);
const char **wnames = va_arg(ap, const char **);
- errcode =
- p9pdu_writef(pdu, optional, "w", nwname);
+ errcode = p9pdu_writef(pdu, proto_version, "w",
+ nwname);
if (!errcode) {
int i;
for (i = 0; i < nwname; i++) {
errcode =
- p9pdu_writef(pdu, optional,
+ p9pdu_writef(pdu,
+ proto_version,
"s",
wnames[i]);
if (errcode)
@@ -462,14 +470,15 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
struct p9_qid *wqids =
va_arg(ap, struct p9_qid *);
- errcode =
- p9pdu_writef(pdu, optional, "w", nwqid);
+ errcode = p9pdu_writef(pdu, proto_version, "w",
+ nwqid);
if (!errcode) {
int i;
for (i = 0; i < nwqid; i++) {
errcode =
- p9pdu_writef(pdu, optional,
+ p9pdu_writef(pdu,
+ proto_version,
"Q",
&wqids[i]);
if (errcode)
@@ -479,7 +488,7 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
}
break;
case '?':
- if (!optional)
+ if (proto_version != p9_proto_2000u)
return 0;
break;
default:
@@ -494,32 +503,32 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
return errcode;
}
-int p9pdu_readf(struct p9_fcall *pdu, int optional, const char *fmt, ...)
+int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
- ret = p9pdu_vreadf(pdu, optional, fmt, ap);
+ ret = p9pdu_vreadf(pdu, proto_version, fmt, ap);
va_end(ap);
return ret;
}
static int
-p9pdu_writef(struct p9_fcall *pdu, int optional, const char *fmt, ...)
+p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
- ret = p9pdu_vwritef(pdu, optional, fmt, ap);
+ ret = p9pdu_vwritef(pdu, proto_version, fmt, ap);
va_end(ap);
return ret;
}
-int p9stat_read(char *buf, int len, struct p9_wstat *st, int dotu)
+int p9stat_read(char *buf, int len, struct p9_wstat *st, int proto_version)
{
struct p9_fcall fake_pdu;
int ret;
@@ -529,7 +538,7 @@ int p9stat_read(char *buf, int len, struct p9_wstat *st, int dotu)
fake_pdu.sdata = buf;
fake_pdu.offset = 0;
- ret = p9pdu_readf(&fake_pdu, dotu, "S", st);
+ ret = p9pdu_readf(&fake_pdu, proto_version, "S", st);
if (ret) {
P9_DPRINTK(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret);
p9pdu_dump(1, &fake_pdu);
diff --git a/net/9p/protocol.h b/net/9p/protocol.h
index ccde462e7ac..2431c0f38d5 100644
--- a/net/9p/protocol.h
+++ b/net/9p/protocol.h
@@ -25,9 +25,9 @@
*
*/
-int
-p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap);
-int p9pdu_readf(struct p9_fcall *pdu, int optional, const char *fmt, ...);
+int p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
+ va_list ap);
+int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...);
int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type);
int p9pdu_finalize(struct p9_fcall *pdu);
void p9pdu_dump(int, struct p9_fcall *);
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index 31d0b05582a..98ce9bcb0e1 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -38,6 +38,7 @@
#include <linux/idr.h>
#include <linux/file.h>
#include <linux/parser.h>
+#include <linux/slab.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
#include <net/9p/transport.h>
diff --git a/net/9p/trans_rdma.c b/net/9p/trans_rdma.c
index 2c95a89c0f4..041101ab4aa 100644
--- a/net/9p/trans_rdma.c
+++ b/net/9p/trans_rdma.c
@@ -40,6 +40,7 @@
#include <linux/file.h>
#include <linux/parser.h>
#include <linux/semaphore.h>
+#include <linux/slab.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
#include <net/9p/transport.h>
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index cb50f4ae5ee..7eb78ecc161 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -37,6 +37,7 @@
#include <linux/inet.h>
#include <linux/idr.h>
#include <linux/file.h>
+#include <linux/slab.h>
#include <net/9p/9p.h>
#include <linux/parser.h>
#include <net/9p/client.h>
@@ -49,8 +50,6 @@
/* a single mutex to manage channel initialization and attachment */
static DEFINE_MUTEX(virtio_9p_lock);
-/* global which tracks highest initialized channel */
-static int chan_index;
/**
* struct virtio_chan - per-instance transport information
@@ -68,8 +67,7 @@ static int chan_index;
*
*/
-static struct virtio_chan {
- bool initialized;
+struct virtio_chan {
bool inuse;
spinlock_t lock;
@@ -80,7 +78,17 @@ static struct virtio_chan {
/* Scatterlist: can be too big for stack. */
struct scatterlist sg[VIRTQUEUE_NUM];
-} channels[MAX_9P_CHAN];
+
+ int tag_len;
+ /*
+ * tag name to identify a mount Non-null terminated
+ */
+ char *tag;
+
+ struct list_head chan_list;
+};
+
+static struct list_head virtio_chan_list;
/* How many bytes left in this page. */
static unsigned int rest_of_page(void *data)
@@ -213,30 +221,38 @@ p9_virtio_request(struct p9_client *client, struct p9_req_t *req)
return 0;
}
+static ssize_t p9_mount_tag_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct virtio_chan *chan;
+ struct virtio_device *vdev;
+
+ vdev = dev_to_virtio(dev);
+ chan = vdev->priv;
+
+ return snprintf(buf, chan->tag_len + 1, "%s", chan->tag);
+}
+
+static DEVICE_ATTR(mount_tag, 0444, p9_mount_tag_show, NULL);
+
/**
* p9_virtio_probe - probe for existence of 9P virtio channels
* @vdev: virtio device to probe
*
- * This probes for existing virtio channels. At present only
- * a single channel is in use, so in the future more work may need
- * to be done here.
+ * This probes for existing virtio channels.
*
*/
static int p9_virtio_probe(struct virtio_device *vdev)
{
+ __u16 tag_len;
+ char *tag;
int err;
struct virtio_chan *chan;
- int index;
- mutex_lock(&virtio_9p_lock);
- index = chan_index++;
- chan = &channels[index];
- mutex_unlock(&virtio_9p_lock);
-
- if (chan_index > MAX_9P_CHAN) {
- printk(KERN_ERR "9p: virtio: Maximum channels exceeded\n");
- BUG();
+ chan = kmalloc(sizeof(struct virtio_chan), GFP_KERNEL);
+ if (!chan) {
+ printk(KERN_ERR "9p: Failed to allocate virtio 9P channel\n");
err = -ENOMEM;
goto fail;
}
@@ -255,15 +271,37 @@ static int p9_virtio_probe(struct virtio_device *vdev)
sg_init_table(chan->sg, VIRTQUEUE_NUM);
chan->inuse = false;
- chan->initialized = true;
+ if (virtio_has_feature(vdev, VIRTIO_9P_MOUNT_TAG)) {
+ vdev->config->get(vdev,
+ offsetof(struct virtio_9p_config, tag_len),
+ &tag_len, sizeof(tag_len));
+ } else {
+ err = -EINVAL;
+ goto out_free_vq;
+ }
+ tag = kmalloc(tag_len, GFP_KERNEL);
+ if (!tag) {
+ err = -ENOMEM;
+ goto out_free_vq;
+ }
+ vdev->config->get(vdev, offsetof(struct virtio_9p_config, tag),
+ tag, tag_len);
+ chan->tag = tag;
+ chan->tag_len = tag_len;
+ err = sysfs_create_file(&(vdev->dev.kobj), &dev_attr_mount_tag.attr);
+ if (err) {
+ kfree(tag);
+ goto out_free_vq;
+ }
+ mutex_lock(&virtio_9p_lock);
+ list_add_tail(&chan->chan_list, &virtio_chan_list);
+ mutex_unlock(&virtio_9p_lock);
return 0;
out_free_vq:
vdev->config->del_vqs(vdev);
+ kfree(chan);
fail:
- mutex_lock(&virtio_9p_lock);
- chan_index--;
- mutex_unlock(&virtio_9p_lock);
return err;
}
@@ -280,35 +318,31 @@ fail:
* We use a simple reference count mechanism to ensure that only a single
* mount has a channel open at a time.
*
- * Bugs: doesn't allow identification of a specific channel
- * to allocate, channels are allocated sequentially. This was
- * a pragmatic decision to get things rolling, but ideally some
- * way of identifying the channel to attach to would be nice
- * if we are going to support multiple channels.
- *
*/
static int
p9_virtio_create(struct p9_client *client, const char *devname, char *args)
{
- struct virtio_chan *chan = channels;
- int index = 0;
+ struct virtio_chan *chan;
+ int ret = -ENOENT;
+ int found = 0;
mutex_lock(&virtio_9p_lock);
- while (index < MAX_9P_CHAN) {
- if (chan->initialized && !chan->inuse) {
- chan->inuse = true;
- break;
- } else {
- index++;
- chan = &channels[index];
+ list_for_each_entry(chan, &virtio_chan_list, chan_list) {
+ if (!strncmp(devname, chan->tag, chan->tag_len)) {
+ if (!chan->inuse) {
+ chan->inuse = true;
+ found = 1;
+ break;
+ }
+ ret = -EBUSY;
}
}
mutex_unlock(&virtio_9p_lock);
- if (index >= MAX_9P_CHAN) {
+ if (!found) {
printk(KERN_ERR "9p: no channels available\n");
- return -ENODEV;
+ return ret;
}
client->trans = (void *)chan;
@@ -329,11 +363,15 @@ static void p9_virtio_remove(struct virtio_device *vdev)
struct virtio_chan *chan = vdev->priv;
BUG_ON(chan->inuse);
+ vdev->config->del_vqs(vdev);
+
+ mutex_lock(&virtio_9p_lock);
+ list_del(&chan->chan_list);
+ mutex_unlock(&virtio_9p_lock);
+ sysfs_remove_file(&(vdev->dev.kobj), &dev_attr_mount_tag.attr);
+ kfree(chan->tag);
+ kfree(chan);
- if (chan->initialized) {
- vdev->config->del_vqs(vdev);
- chan->initialized = false;
- }
}
static struct virtio_device_id id_table[] = {
@@ -341,13 +379,19 @@ static struct virtio_device_id id_table[] = {
{ 0 },
};
+static unsigned int features[] = {
+ VIRTIO_9P_MOUNT_TAG,
+};
+
/* The standard "struct lguest_driver": */
static struct virtio_driver p9_virtio_drv = {
- .driver.name = KBUILD_MODNAME,
- .driver.owner = THIS_MODULE,
- .id_table = id_table,
- .probe = p9_virtio_probe,
- .remove = p9_virtio_remove,
+ .feature_table = features,
+ .feature_table_size = ARRAY_SIZE(features),
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .probe = p9_virtio_probe,
+ .remove = p9_virtio_remove,
};
static struct p9_trans_module p9_virtio_trans = {
@@ -364,10 +408,7 @@ static struct p9_trans_module p9_virtio_trans = {
/* The standard init function */
static int __init p9_virtio_init(void)
{
- int count;
-
- for (count = 0; count < MAX_9P_CHAN; count++)
- channels[count].initialized = false;
+ INIT_LIST_HEAD(&virtio_chan_list);
v9fs_register_trans(&p9_virtio_trans);
return register_virtio_driver(&p9_virtio_drv);
diff --git a/net/9p/util.c b/net/9p/util.c
index dc4ec05ad93..e048701a72d 100644
--- a/net/9p/util.c
+++ b/net/9p/util.c
@@ -30,6 +30,7 @@
#include <linux/sched.h>
#include <linux/parser.h>
#include <linux/idr.h>
+#include <linux/slab.h>
#include <net/9p/9p.h>
/**
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-03-09 00:54:51 +0000