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9p: apply common request code to trans_fd

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Apply the now common p9_req_t structure to the fd transport.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Eric Van Hensbergen 2008-10-13 18:45:22 -05:00
parent ff683452f7
commit 673d62cdaa
4 changed files with 126 additions and 172 deletions

10
include/net/9p/client.h

@ -49,11 +49,12 @@ enum p9_trans_status {
* enum p9_req_status_t - virtio request status
* @REQ_STATUS_IDLE: request slot unused
* @REQ_STATUS_ALLOC: request has been allocated but not sent
* @REQ_STATUS_UNSENT: request waiting to be sent
* @REQ_STATUS_SENT: request sent to server
* @REQ_STATUS_FLSH: a flush has been sent for this request
* @REQ_STATUS_RCVD: response received from server
* @REQ_STATUS_FLSHD: request has been flushed
* @REQ_STATUS_ERR: request encountered an error on the client side
* @REQ_STATUS_ERROR: request encountered an error on the client side
*
* The @REQ_STATUS_IDLE state is used to mark a request slot as unused
* but use is actually tracked by the idpool structure which handles tag
@ -64,6 +65,7 @@ enum p9_trans_status {
enum p9_req_status_t {
REQ_STATUS_IDLE,
REQ_STATUS_ALLOC,
REQ_STATUS_UNSENT,
REQ_STATUS_SENT,
REQ_STATUS_FLSH,
REQ_STATUS_RCVD,
@ -79,6 +81,8 @@ enum p9_req_status_t {
* @tc: the request fcall structure
* @rc: the response fcall structure
* @aux: transport specific data (provided for trans_fd migration)
* @tag: tag on request (BUG: redundant)
* @req_list: link for higher level objects to chain requests
*
* Transport use an array to track outstanding requests
* instead of a list. While this may incurr overhead during initial
@ -99,6 +103,9 @@ struct p9_req_t {
struct p9_fcall *rc;
u16 flush_tag;
void *aux;
int tag;
struct list_head req_list;
};
/**
@ -207,5 +214,6 @@ struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset);
struct p9_req_t *p9_tag_alloc(struct p9_client *, u16);
struct p9_req_t *p9_tag_lookup(struct p9_client *, u16);
void p9_free_req(struct p9_client *, struct p9_req_t *);
#endif /* NET_9P_CLIENT_H */

21
net/9p/client.c

@ -268,6 +268,27 @@ static void p9_tag_cleanup(struct p9_client *c)
c->max_tag = 0;
}
/**
* p9_free_req - free a request and clean-up as necessary
* c: client state
* r: request to release
*
*/
void p9_free_req(struct p9_client *c, struct p9_req_t *r)
{
r->flush_tag = P9_NOTAG;
r->status = REQ_STATUS_IDLE;
if (r->tc->tag != P9_NOTAG && p9_idpool_check(r->tc->tag, c->tagpool))
p9_idpool_put(r->tc->tag, c->tagpool);
/* if this was a flush request we have to free response fcall */
if (r->tc->id == P9_TFLUSH) {
kfree(r->tc);
kfree(r->rc);
}
}
static struct p9_fid *p9_fid_create(struct p9_client *clnt)
{
int err;

262
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_client *, struct p9_req_t *);
static void p9_conn_rpc_cb(struct p9_req *req);
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;

5
net/9p/trans_virtio.c

@ -247,10 +247,7 @@ p9_virtio_rpc(struct p9_client *c, struct p9_fcall *tc, struct p9_fcall **rc)
}
#endif
if (n != P9_NOTAG && p9_idpool_check(n, c->tagpool))
p9_idpool_put(n, c->tagpool);
req->status = REQ_STATUS_IDLE;
p9_free_req(c, req);
return 0;
}