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authorEric Van Hensbergen <ericvh@gmail.com>2008-10-13 18:45:22 -0500
committerEric Van Hensbergen <ericvh@gmail.com>2008-10-17 11:04:42 -0500
commit673d62cdaac6ffbce980a349d3174b3929ceb9e5 (patch)
tree2917ded31ef9b3ab004c3a5575537643b34269e9 /net/9p/trans_fd.c
parentff683452f7bc52d7fd653cf5e67b1134555734c7 (diff)
downloadlinux-2.6.38-lt-ux500-673d62cdaac6ffbce980a349d3174b3929ceb9e5.tar.gz
9p: apply common request code to trans_fd
Apply the now common p9_req_t structure to the fd transport. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'net/9p/trans_fd.c')
-rw-r--r--net/9p/trans_fd.c262
1 files changed, 95 insertions, 167 deletions
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index 6243093934b..cc9bc739e9d 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -44,7 +44,6 @@
#define P9_PORT 564
#define MAX_SOCK_BUF (64*1024)
-#define ERREQFLUSH 1
#define MAXPOLLWADDR 2
/**
@@ -99,38 +98,6 @@ enum {
Wpending = 8, /* can write */
};
-enum {
- None,
- Flushing,
- Flushed,
-};
-
-/**
- * struct p9_req - fd mux encoding of an rpc transaction
- * @lock: protects req_list
- * @tag: numeric tag for rpc transaction
- * @tcall: request &p9_fcall structure
- * @rcall: response &p9_fcall structure
- * @err: error state
- * @flush: flag to indicate RPC has been flushed
- * @req_list: list link for higher level objects to chain requests
- * @m: connection this request was issued on
- * @wqueue: wait queue that client is blocked on for this rpc
- *
- */
-
-struct p9_req {
- spinlock_t lock;
- int tag;
- struct p9_fcall *tcall;
- struct p9_fcall *rcall;
- int err;
- int flush;
- struct list_head req_list;
- struct p9_conn *m;
- wait_queue_head_t wqueue;
-};
-
struct p9_poll_wait {
struct p9_conn *conn;
wait_queue_t wait;
@@ -139,7 +106,6 @@ struct p9_poll_wait {
/**
* struct p9_conn - fd mux connection state information
- * @lock: protects mux_list (?)
* @mux_list: list link for mux to manage multiple connections (?)
* @client: reference to client instance for this connection
* @err: error state
@@ -161,7 +127,6 @@ struct p9_poll_wait {
*/
struct p9_conn {
- spinlock_t lock; /* protect lock structure */
struct list_head mux_list;
struct p9_client *client;
int err;
@@ -205,64 +170,41 @@ static void p9_mux_poll_stop(struct p9_conn *m)
spin_unlock_irqrestore(&p9_poll_lock, flags);
}
-static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req)
-{
- if (req->tag != P9_NOTAG &&
- p9_idpool_check(req->tag, m->client->tagpool))
- p9_idpool_put(req->tag, m->client->tagpool);
- kfree(req);
-}
-
-static void p9_conn_rpc_cb(struct p9_req *req);
+static void p9_conn_rpc_cb(struct p9_client *, struct p9_req_t *);
-static void p9_mux_flush_cb(struct p9_req *freq)
+static void p9_mux_flush_cb(struct p9_client *client, struct p9_req_t *freq)
{
- int tag;
- struct p9_conn *m = freq->m;
- struct p9_req *req, *rreq, *rptr;
+ struct p9_conn *m = client->trans;
+ struct p9_req_t *req;
P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m,
- freq->tcall, freq->rcall, freq->err,
- freq->tcall->params.tflush.oldtag);
-
- spin_lock(&m->lock);
- tag = freq->tcall->params.tflush.oldtag;
- req = NULL;
- list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
- if (rreq->tag == tag) {
- req = rreq;
- list_del(&req->req_list);
- break;
- }
- }
- spin_unlock(&m->lock);
+ freq->tc, freq->rc, freq->t_err,
+ freq->tc->params.tflush.oldtag);
+ req = p9_tag_lookup(client, freq->tc->params.tflush.oldtag);
if (req) {
- spin_lock(&req->lock);
- req->flush = Flushed;
- spin_unlock(&req->lock);
-
- p9_conn_rpc_cb(req);
+ req->status = REQ_STATUS_FLSHD;
+ list_del(&req->req_list);
+ p9_conn_rpc_cb(client, req);
}
- kfree(freq->tcall);
- kfree(freq->rcall);
- p9_mux_free_request(m, freq);
+ p9_free_req(client, freq);
}
-static void p9_conn_rpc_cb(struct p9_req *req)
+static void p9_conn_rpc_cb(struct p9_client *client, struct p9_req_t *req)
{
P9_DPRINTK(P9_DEBUG_MUX, "req %p\n", req);
- if (req->tcall->id == P9_TFLUSH) { /* flush callback */
+ if (req->tc->id == P9_TFLUSH) { /* flush callback */
P9_DPRINTK(P9_DEBUG_MUX, "flush req %p\n", req);
- p9_mux_flush_cb(req);
+ p9_mux_flush_cb(client, req);
} else { /* normal wakeup path */
P9_DPRINTK(P9_DEBUG_MUX, "normal req %p\n", req);
- if (req->flush != None && !req->err)
- req->err = -ERESTARTSYS;
+ if (!req->t_err && (req->status == REQ_STATUS_FLSHD ||
+ req->status == REQ_STATUS_FLSH))
+ req->t_err = -ERESTARTSYS;
- wake_up(&req->wqueue);
+ wake_up(req->wq);
}
}
@@ -275,59 +217,62 @@ static void p9_conn_rpc_cb(struct p9_req *req)
void p9_conn_cancel(struct p9_conn *m, int err)
{
- struct p9_req *req, *rtmp;
+ struct p9_req_t *req, *rtmp;
LIST_HEAD(cancel_list);
P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
m->err = err;
- spin_lock(&m->lock);
+ spin_lock(&m->client->lock);
list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
+ req->status = REQ_STATUS_ERROR;
+ if (!req->t_err)
+ req->t_err = err;
list_move(&req->req_list, &cancel_list);
}
list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
+ req->status = REQ_STATUS_ERROR;
+ if (!req->t_err)
+ req->t_err = err;
list_move(&req->req_list, &cancel_list);
}
- spin_unlock(&m->lock);
+ spin_unlock(&m->client->lock);
list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
list_del(&req->req_list);
- if (!req->err)
- req->err = err;
-
- p9_conn_rpc_cb(req);
+ p9_conn_rpc_cb(m->client, req);
}
}
-static void process_request(struct p9_conn *m, struct p9_req *req)
+static void process_request(struct p9_conn *m, struct p9_req_t *req)
{
int ecode;
struct p9_str *ename;
- if (!req->err && req->rcall->id == P9_RERROR) {
- ecode = req->rcall->params.rerror.errno;
- ename = &req->rcall->params.rerror.error;
+ if (!req->t_err && req->rc->id == P9_RERROR) {
+ ecode = req->rc->params.rerror.errno;
+ ename = &req->rc->params.rerror.error;
P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
ename->str);
if (m->client->dotu)
- req->err = -ecode;
+ req->t_err = -ecode;
- if (!req->err) {
- req->err = p9_errstr2errno(ename->str, ename->len);
+ if (!req->t_err) {
+ req->t_err = p9_errstr2errno(ename->str, ename->len);
/* string match failed */
- if (!req->err) {
- PRINT_FCALL_ERROR("unknown error", req->rcall);
- req->err = -ESERVERFAULT;
+ if (!req->t_err) {
+ PRINT_FCALL_ERROR("unknown error", req->rc);
+ req->t_err = -ESERVERFAULT;
}
}
- } else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
+ } else if (req->tc && req->rc->id != req->tc->id + 1) {
P9_DPRINTK(P9_DEBUG_ERROR,
"fcall mismatch: expected %d, got %d\n",
- req->tcall->id + 1, req->rcall->id);
- if (!req->err)
- req->err = -EIO;
+ req->tc->id + 1, req->rc->id);
+ if (!req->t_err)
+ req->t_err = -EIO;
}
}
@@ -401,7 +346,7 @@ static void p9_read_work(struct work_struct *work)
{
int n, err;
struct p9_conn *m;
- struct p9_req *req, *rptr, *rreq;
+ struct p9_req_t *req;
struct p9_fcall *rcall;
char *rbuf;
@@ -488,24 +433,19 @@ static void p9_read_work(struct work_struct *work)
P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
rcall->id, rcall->tag);
- req = NULL;
- spin_lock(&m->lock);
- list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
- if (rreq->tag == rcall->tag) {
- req = rreq;
- if (req->flush != Flushing)
- list_del(&req->req_list);
- break;
- }
- }
- spin_unlock(&m->lock);
+ req = p9_tag_lookup(m->client, rcall->tag);
if (req) {
- req->rcall = rcall;
+ if (req->status != REQ_STATUS_FLSH) {
+ list_del(&req->req_list);
+ req->status = REQ_STATUS_RCVD;
+ }
+
+ req->rc = rcall;
process_request(m, req);
- if (req->flush != Flushing)
- p9_conn_rpc_cb(req);
+ if (req->status != REQ_STATUS_FLSH)
+ p9_conn_rpc_cb(m->client, req);
} else {
if (err >= 0 && rcall->id != P9_RFLUSH)
P9_DPRINTK(P9_DEBUG_ERROR,
@@ -580,7 +520,7 @@ static void p9_write_work(struct work_struct *work)
{
int n, err;
struct p9_conn *m;
- struct p9_req *req;
+ struct p9_req_t *req;
m = container_of(work, struct p9_conn, wq);
@@ -595,18 +535,16 @@ static void p9_write_work(struct work_struct *work)
return;
}
- spin_lock(&m->lock);
-again:
- req = list_entry(m->unsent_req_list.next, struct p9_req,
+ spin_lock(&m->client->lock);
+ req = list_entry(m->unsent_req_list.next, struct p9_req_t,
req_list);
+ req->status = REQ_STATUS_SENT;
list_move_tail(&req->req_list, &m->req_list);
- if (req->err == ERREQFLUSH)
- goto again;
- m->wbuf = req->tcall->sdata;
- m->wsize = req->tcall->size;
+ m->wbuf = req->tc->sdata;
+ m->wsize = req->tc->size;
m->wpos = 0;
- spin_unlock(&m->lock);
+ spin_unlock(&m->client->lock);
}
P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos,
@@ -725,7 +663,6 @@ static struct p9_conn *p9_conn_create(struct p9_client *client)
if (!m)
return ERR_PTR(-ENOMEM);
- spin_lock_init(&m->lock);
INIT_LIST_HEAD(&m->mux_list);
m->client = client;
@@ -812,30 +749,27 @@ static void p9_poll_mux(struct p9_conn *m)
*
*/
-static struct p9_req *p9_send_request(struct p9_conn *m, struct p9_fcall *tc)
+static struct p9_req_t *p9_send_request(struct p9_conn *m, struct p9_fcall *tc)
{
+ int tag;
int n;
- struct p9_req *req;
+ struct p9_req_t *req;
P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
tc, tc->id);
if (m->err < 0)
return ERR_PTR(m->err);
- req = kmalloc(sizeof(struct p9_req), GFP_KERNEL);
- if (!req)
- return ERR_PTR(-ENOMEM);
-
- n = P9_NOTAG;
+ tag = P9_NOTAG;
if (tc->id != P9_TVERSION) {
- n = p9_idpool_get(m->client->tagpool);
- if (n < 0) {
- kfree(req);
+ tag = p9_idpool_get(m->client->tagpool);
+ if (tag < 0)
return ERR_PTR(-ENOMEM);
- }
}
- p9_set_tag(tc, n);
+ p9_set_tag(tc, tag);
+
+ req = p9_tag_alloc(m->client, tag);
#ifdef CONFIG_NET_9P_DEBUG
if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
@@ -846,18 +780,15 @@ static struct p9_req *p9_send_request(struct p9_conn *m, struct p9_fcall *tc)
}
#endif
- spin_lock_init(&req->lock);
- req->m = m;
- init_waitqueue_head(&req->wqueue);
- req->tag = n;
- req->tcall = tc;
- req->rcall = NULL;
- req->err = 0;
- req->flush = None;
+ req->tag = tag;
+ req->tc = tc;
+ req->rc = NULL;
+ req->t_err = 0;
+ req->status = REQ_STATUS_UNSENT;
- spin_lock(&m->lock);
+ spin_lock(&m->client->lock);
list_add_tail(&req->req_list, &m->unsent_req_list);
- spin_unlock(&m->lock);
+ spin_unlock(&m->client->lock);
if (test_and_clear_bit(Wpending, &m->wsched))
n = POLLOUT;
@@ -871,39 +802,36 @@ static struct p9_req *p9_send_request(struct p9_conn *m, struct p9_fcall *tc)
}
static int
-p9_mux_flush_request(struct p9_conn *m, struct p9_req *req)
+p9_mux_flush_request(struct p9_conn *m, struct p9_req_t *req)
{
struct p9_fcall *fc;
- struct p9_req *rreq, *rptr;
+ struct p9_req_t *rreq, *rptr;
P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
/* if a response was received for a request, do nothing */
- spin_lock(&req->lock);
- if (req->rcall || req->err) {
- spin_unlock(&req->lock);
+ if (req->rc || req->t_err) {
P9_DPRINTK(P9_DEBUG_MUX,
"mux %p req %p response already received\n", m, req);
return 0;
}
- req->flush = Flushing;
- spin_unlock(&req->lock);
+ req->status = REQ_STATUS_FLSH;
- spin_lock(&m->lock);
+ spin_lock(&m->client->lock);
/* if the request is not sent yet, just remove it from the list */
list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) {
if (rreq->tag == req->tag) {
P9_DPRINTK(P9_DEBUG_MUX,
"mux %p req %p request is not sent yet\n", m, req);
list_del(&rreq->req_list);
- req->flush = Flushed;
- spin_unlock(&m->lock);
- p9_conn_rpc_cb(req);
+ req->status = REQ_STATUS_FLSHD;
+ spin_unlock(&m->client->lock);
+ p9_conn_rpc_cb(m->client, req);
return 0;
}
}
- spin_unlock(&m->lock);
+ spin_unlock(&m->client->lock);
clear_thread_flag(TIF_SIGPENDING);
fc = p9_create_tflush(req->tag);
@@ -927,7 +855,7 @@ p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc)
struct p9_conn *m = p->conn;
int err, sigpending;
unsigned long flags;
- struct p9_req *req;
+ struct p9_req_t *req;
if (rc)
*rc = NULL;
@@ -945,10 +873,10 @@ p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc)
return err;
}
- err = wait_event_interruptible(req->wqueue, req->rcall != NULL ||
- req->err < 0);
- if (req->err < 0)
- err = req->err;
+ err = wait_event_interruptible(*req->wq, req->rc != NULL ||
+ req->t_err < 0);
+ if (req->t_err < 0)
+ err = req->t_err;
if (err == -ERESTARTSYS && client->status == Connected
&& m->err == 0) {
@@ -956,9 +884,9 @@ p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc)
/* wait until we get response of the flush message */
do {
clear_thread_flag(TIF_SIGPENDING);
- err = wait_event_interruptible(req->wqueue,
- req->rcall || req->err);
- } while (!req->rcall && !req->err &&
+ err = wait_event_interruptible(*req->wq,
+ req->rc || req->t_err);
+ } while (!req->rc && !req->t_err &&
err == -ERESTARTSYS &&
client->status == Connected && !m->err);
@@ -974,11 +902,11 @@ p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc)
}
if (rc)
- *rc = req->rcall;
+ *rc = req->rc;
else
- kfree(req->rcall);
+ kfree(req->rc);
- p9_mux_free_request(m, req);
+ p9_free_req(client, req);
if (err > 0)
err = -EIO;