9p: rework client code to use new protocol support functions

Now that the new protocol functions are in place, this patch switches
the client code to using the new support code.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

fs/9p/v9fs_vfs.h

@@ -46,10 +46,10 @@ extern struct dentry_operations v9fs_cached_dentry_operations;
 
 struct inode *v9fs_get_inode(struct super_block *sb, int mode);
 ino_t v9fs_qid2ino(struct p9_qid *qid);
-void v9fs_stat2inode(struct p9_stat *, struct inode *, struct super_block *);
+void v9fs_stat2inode(struct p9_wstat *, struct inode *, struct super_block *);
 int v9fs_dir_release(struct inode *inode, struct file *filp);
 int v9fs_file_open(struct inode *inode, struct file *file);
-void v9fs_inode2stat(struct inode *inode, struct p9_stat *stat);
+void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat);
 void v9fs_dentry_release(struct dentry *);
 int v9fs_uflags2omode(int uflags, int extended);
 

fs/9p/vfs_dir.c

@@ -85,8 +85,8 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
 		return -ENOMEM;
 
 	while (1) {
-		err = v9fs_file_readn(filp, statbuf, NULL, fid->rdir_fpos,
-									buflen);
+		err = v9fs_file_readn(filp, statbuf, NULL, buflen,
+								fid->rdir_fpos);
 		if (err <= 0)
 			break;
 

fs/9p/vfs_file.c

@@ -136,7 +136,7 @@ v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
 	int n, total;
 	struct p9_fid *fid = filp->private_data;
 
-	P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
+	P9_DPRINTK(P9_DEBUG_VFS, "fid %d offset %llu count %d\n", fid->fid,
 					(long long unsigned) offset, count);
 
 	n = 0;

fs/9p/vfs_inode.c

@@ -334,7 +334,7 @@ v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 {
 	int err, umode;
 	struct inode *ret;
-	struct p9_stat *st;
+	struct p9_wstat *st;
 
 	ret = NULL;
 	st = p9_client_stat(fid);
@@ -417,6 +417,8 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
 	struct p9_fid *dfid, *ofid, *fid;
 	struct inode *inode;
 
+	P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
+
 	err = 0;
 	ofid = NULL;
 	fid = NULL;
@@ -424,6 +426,7 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
 	dfid = v9fs_fid_clone(dentry->d_parent);
 	if (IS_ERR(dfid)) {
 		err = PTR_ERR(dfid);
+		P9_DPRINTK(P9_DEBUG_VFS, "fid clone failed %d\n", err);
 		dfid = NULL;
 		goto error;
 	}
@@ -432,18 +435,22 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
 	ofid = p9_client_walk(dfid, 0, NULL, 1);
 	if (IS_ERR(ofid)) {
 		err = PTR_ERR(ofid);
+		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 		ofid = NULL;
 		goto error;
 	}
 
 	err = p9_client_fcreate(ofid, name, perm, mode, extension);
-	if (err < 0)
+	if (err < 0) {
+		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
 		goto error;
+	}
 
 	/* now walk from the parent so we can get unopened fid */
 	fid = p9_client_walk(dfid, 1, &name, 0);
 	if (IS_ERR(fid)) {
 		err = PTR_ERR(fid);
+		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 		fid = NULL;
 		goto error;
 	} else
@@ -453,6 +460,7 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
 	inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 	if (IS_ERR(inode)) {
 		err = PTR_ERR(inode);
+		P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 		goto error;
 	}
 
@@ -734,7 +742,7 @@ v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
 	int err;
 	struct v9fs_session_info *v9ses;
 	struct p9_fid *fid;
-	struct p9_stat *st;
+	struct p9_wstat *st;
 
 	P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 	err = -EPERM;
@@ -815,10 +823,9 @@ static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
  */
 
 void
-v9fs_stat2inode(struct p9_stat *stat, struct inode *inode,
+v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
 	struct super_block *sb)
 {
-	int n;
 	char ext[32];
 	struct v9fs_session_info *v9ses = sb->s_fs_info;
 
@@ -842,11 +849,7 @@ v9fs_stat2inode(struct p9_stat *stat, struct inode *inode,
 		int major = -1;
 		int minor = -1;
 
-		n = stat->extension.len;
-		if (n > sizeof(ext)-1)
-			n = sizeof(ext)-1;
-		memmove(ext, stat->extension.str, n);
-		ext[n] = 0;
+		strncpy(ext, stat->extension, sizeof(ext));
 		sscanf(ext, "%c %u %u", &type, &major, &minor);
 		switch (type) {
 		case 'c':
@@ -857,8 +860,8 @@ v9fs_stat2inode(struct p9_stat *stat, struct inode *inode,
 			break;
 		default:
 			P9_DPRINTK(P9_DEBUG_ERROR,
-				"Unknown special type %c (%.*s)\n", type,
-				stat->extension.len, stat->extension.str);
+				"Unknown special type %c %s\n", type,
+				stat->extension);
 		};
 		inode->i_rdev = MKDEV(major, minor);
 	} else
@@ -904,7 +907,7 @@ static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
 
 	struct v9fs_session_info *v9ses;
 	struct p9_fid *fid;
-	struct p9_stat *st;
+	struct p9_wstat *st;
 
 	P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
 	retval = -EPERM;
@@ -926,15 +929,10 @@ static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
 	}
 
 	/* copy extension buffer into buffer */
-	if (st->extension.len < buflen)
-		buflen = st->extension.len + 1;
-
-	memmove(buffer, st->extension.str, buflen - 1);
-	buffer[buflen-1] = 0;
+	strncpy(buffer, st->extension, buflen);
 
 	P9_DPRINTK(P9_DEBUG_VFS,
-		"%s -> %.*s (%s)\n", dentry->d_name.name, st->extension.len,
-		st->extension.str, buffer);
+		"%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
 
 	retval = buflen;
 

fs/9p/vfs_super.c

@@ -111,7 +111,7 @@ static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
 	struct inode *inode = NULL;
 	struct dentry *root = NULL;
 	struct v9fs_session_info *v9ses = NULL;
-	struct p9_stat *st = NULL;
+	struct p9_wstat *st = NULL;
 	int mode = S_IRWXUGO | S_ISVTX;
 	uid_t uid = current->fsuid;
 	gid_t gid = current->fsgid;
@@ -161,10 +161,14 @@ static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
 
 	sb->s_root = root;
 	root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
+
 	v9fs_stat2inode(st, root->d_inode, sb);
+
 	v9fs_fid_add(root, fid);
+	p9stat_free(st);
 	kfree(st);
 
+P9_DPRINTK(P9_DEBUG_VFS, " return simple set mount\n");
 	return simple_set_mnt(mnt, sb);
 
 release_sb:

include/net/9p/9p.h

@@ -39,6 +39,7 @@
  * @P9_DEBUG_TRANS: transport tracing
  * @P9_DEBUG_SLABS: memory management tracing
  * @P9_DEBUG_FCALL: verbose dump of protocol messages
+ * @P9_DEBUG_FID: fid allocation/deallocation tracking
  *
  * These flags are passed at mount time to turn on various levels of
  * verbosity and tracing which will be output to the system logs.
@@ -53,13 +54,17 @@ enum p9_debug_flags {
 	P9_DEBUG_TRANS =	(1<<6),
 	P9_DEBUG_SLABS =      	(1<<7),
 	P9_DEBUG_FCALL =	(1<<8),
+	P9_DEBUG_FID =		(1<<9),
 };
 
 extern unsigned int p9_debug_level;
 
 #define P9_DPRINTK(level, format, arg...) \
 do {  \
-	if ((p9_debug_level & level) == level) \
+	if (level == P9_DEBUG_9P) \
+		printk(KERN_NOTICE "(%8.8d) " \
+		format , task_pid_nr(current) , ## arg); \
+	else if ((p9_debug_level & level) == level) \
 		printk(KERN_NOTICE "-- %s (%d): " \
 		format , __func__, task_pid_nr(current) , ## arg); \
 } while (0)

include/net/9p/client.h

@@ -77,6 +77,7 @@ enum p9_req_status_t {
  * struct p9_req_t - request slots
  * @status: status of this request slot
  * @t_err: transport error
+ * @flush_tag: tag of request being flushed (for flush requests)
  * @wq: wait_queue for the client to block on for this request
  * @tc: the request fcall structure
  * @rc: the response fcall structure
@@ -97,10 +98,10 @@ enum p9_req_status_t {
 struct p9_req_t {
 	int status;
 	int t_err;
+	u16 flush_tag;
 	wait_queue_head_t *wq;
 	struct p9_fcall *tc;
 	struct p9_fcall *rc;
-	u16 flush_tag;
 	void *aux;
 
 	struct list_head req_list;
@@ -199,10 +200,12 @@ int p9_client_read(struct p9_fid *fid, char *data, char __user *udata,
 							u64 offset, u32 count);
 int p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
 							u64 offset, u32 count);
-struct p9_stat *p9_client_stat(struct p9_fid *fid);
+struct p9_wstat *p9_client_stat(struct p9_fid *fid);
 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst);
 
 struct p9_req_t *p9_tag_lookup(struct p9_client *, u16);
 void p9_client_cb(struct p9_client *c, struct p9_req_t *req);
 
+void p9stat_free(struct p9_wstat *);
+
 #endif /* NET_9P_CLIENT_H */

net/9p/client.c

@@ -35,6 +35,7 @@
 #include <linux/parser.h>
 #include <net/9p/client.h>
 #include <net/9p/transport.h>
+#include "protocol.h"
 
 /*
   * Client Option Parsing (code inspired by NFS code)
@@ -55,8 +56,8 @@ static const match_table_t tokens = {
 	{Opt_err, NULL},
 };
 
-static int
-p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, struct p9_fcall **rc);
+static struct p9_req_t *
+p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
 
 /**
  * v9fs_parse_options - parse mount options into session structure
@@ -138,10 +139,11 @@ static int parse_opts(char *opts, struct p9_client *clnt)
  *
  */
 
-struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
+static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
 {
 	unsigned long flags;
 	int row, col;
+	struct p9_req_t *req;
 
 	/* This looks up the original request by tag so we know which
 	 * buffer to read the data into */
@@ -157,19 +159,11 @@ struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
 
 			if (!c->reqs[row]) {
 				printk(KERN_ERR "Couldn't grow tag array\n");
-				BUG();
+				return ERR_PTR(-ENOMEM);
 			}
 			for (col = 0; col < P9_ROW_MAXTAG; col++) {
 				c->reqs[row][col].status = REQ_STATUS_IDLE;
-				c->reqs[row][col].flush_tag = P9_NOTAG;
-				c->reqs[row][col].wq = kmalloc(
-					sizeof(wait_queue_head_t), GFP_ATOMIC);
-				if (!c->reqs[row][col].wq) {
-					printk(KERN_ERR
-						"Couldn't grow tag array\n");
-					BUG();
-				}
-				init_waitqueue_head(c->reqs[row][col].wq);
+				c->reqs[row][col].tc = NULL;
 			}
 			c->max_tag += P9_ROW_MAXTAG;
 		}
@@ -178,12 +172,39 @@ struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
 	row = tag / P9_ROW_MAXTAG;
 	col = tag % P9_ROW_MAXTAG;
 
-	c->reqs[row][col].status = REQ_STATUS_ALLOC;
-	c->reqs[row][col].flush_tag = P9_NOTAG;
+	req = &c->reqs[row][col];
+	if (!req->tc) {
+		req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
+		if (!req->wq) {
+			printk(KERN_ERR "Couldn't grow tag array\n");
+			return ERR_PTR(-ENOMEM);
+		}
+		init_waitqueue_head(req->wq);
+		req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
+								GFP_KERNEL);
+		req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
+								GFP_KERNEL);
+		if ((!req->tc) || (!req->rc)) {
+			printk(KERN_ERR "Couldn't grow tag array\n");
+			kfree(req->tc);
+			kfree(req->rc);
+			return ERR_PTR(-ENOMEM);
+		}
+		req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
+		req->tc->capacity = c->msize;
+		req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
+		req->rc->capacity = c->msize;
+	}
+
+	p9pdu_reset(req->tc);
+	p9pdu_reset(req->rc);
+
+	req->flush_tag = 0;
+	req->tc->tag = tag-1;
+	req->status = REQ_STATUS_ALLOC;
 
 	return &c->reqs[row][col];
 }
-EXPORT_SYMBOL(p9_tag_alloc);
 
 /**
  * p9_tag_lookup - lookup a request by tag
@@ -264,43 +285,16 @@ static void p9_tag_cleanup(struct p9_client *c)
 
 	/* free requests associated with tags */
 	for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
-		for (col = 0; col < P9_ROW_MAXTAG; col++)
+		for (col = 0; col < P9_ROW_MAXTAG; col++) {
 			kfree(c->reqs[row][col].wq);
+			kfree(c->reqs[row][col].tc);
+			kfree(c->reqs[row][col].rc);
+		}
 		kfree(c->reqs[row]);
 	}
 	c->max_tag = 0;
 }
 
-/**
- * p9_client_flush - flush (cancel) a request
- * c: client state
- * req: request to cancel
- *
- * This sents a flush for a particular requests and links
- * the flush request to the original request.  The current
- * code only supports a single flush request although the protocol
- * allows for multiple flush requests to be sent for a single request.
- *
- */
-
-static int p9_client_flush(struct p9_client *c, struct p9_req_t *req)
-{
-	struct p9_fcall *tc, *rc = NULL;
-	int err;
-
-	P9_DPRINTK(P9_DEBUG_9P, "client %p tag %d\n", c, req->tc->tag);
-
-	tc = p9_create_tflush(req->tc->tag);
-	if (IS_ERR(tc))
-		return PTR_ERR(tc);
-
-	err = p9_client_rpc(c, tc, &rc);
-
-	/* we don't free anything here because RPC isn't complete */
-
-	return err;
-}
-
 /**
  * p9_free_req - free a request and clean-up as necessary
  * c: client state
@@ -308,15 +302,17 @@ static int p9_client_flush(struct p9_client *c, struct p9_req_t *req)
  *
  */
 
-void p9_free_req(struct p9_client *c, struct p9_req_t *r)
+static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
 {
-	r->flush_tag = P9_NOTAG;
+	int tag = r->tc->tag;
+	P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
+
 	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 (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
+		p9_idpool_put(tag, c->tagpool);
 
 	/* if this was a flush request we have to free response fcall */
-	if (r->tc->id == P9_TFLUSH) {
+	if (r->rc->id == P9_RFLUSH) {
 		kfree(r->tc);
 		kfree(r->rc);
 	}
@@ -333,30 +329,28 @@ void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
 	struct p9_req_t *other_req;
 	unsigned long flags;
 
-	P9_DPRINTK(P9_DEBUG_MUX, ": %d\n", req->tc->tag);
+	P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
 
 	if (req->status == REQ_STATUS_ERROR)
 		wake_up(req->wq);
 
-	if (req->tc->id == P9_TFLUSH) { /* flush receive path */
-		P9_DPRINTK(P9_DEBUG_MUX, "flush: %d\n", req->tc->tag);
+	if (req->flush_tag) { 			/* flush receive path */
+		P9_DPRINTK(P9_DEBUG_9P, "<<< RFLUSH %d\n", req->tc->tag);
 		spin_lock_irqsave(&c->lock, flags);
-		other_req = p9_tag_lookup(c, req->tc->params.tflush.oldtag);
-		if (other_req->flush_tag != req->tc->tag) /* stale flush */
+		other_req = p9_tag_lookup(c, req->flush_tag);
+		if (other_req->status != REQ_STATUS_FLSH) /* stale flush */
 			spin_unlock_irqrestore(&c->lock, flags);
 		else {
-			BUG_ON(other_req->status != REQ_STATUS_FLSH);
 			other_req->status = REQ_STATUS_FLSHD;
 			spin_unlock_irqrestore(&c->lock, flags);
 			wake_up(other_req->wq);
 		}
 		p9_free_req(c, req);
 	} else { 				/* normal receive path */
-		P9_DPRINTK(P9_DEBUG_MUX, "normal: %d\n", req->tc->tag);
+		P9_DPRINTK(P9_DEBUG_MUX, "normal: tag %d\n", req->tc->tag);
 		spin_lock_irqsave(&c->lock, flags);
 		if (req->status != REQ_STATUS_FLSHD)
 			req->status = REQ_STATUS_RCVD;
-		req->flush_tag = P9_NOTAG;
 		spin_unlock_irqrestore(&c->lock, flags);
 		wake_up(req->wq);
 		P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
@@ -364,29 +358,165 @@ void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
 }
 EXPORT_SYMBOL(p9_client_cb);
 
+/**
+ * p9_parse_header - parse header arguments out of a packet
+ * @pdu: packet to parse
+ * @size: size of packet
+ * @type: type of request
+ * @tag: tag of packet
+ * @rewind: set if we need to rewind offset afterwards
+ */
+
+int
+p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
+								int rewind)
+{
+	int8_t r_type;
+	int16_t r_tag;
+	int32_t r_size;
+	int offset = pdu->offset;
+	int err;
+
+	pdu->offset = 0;
+	if (pdu->size == 0)
+		pdu->size = 7;
+
+	err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
+	if (err)
+		goto rewind_and_exit;
+
+	pdu->size = r_size;
+	pdu->id = r_type;
+	pdu->tag = r_tag;
+
+	P9_DPRINTK(P9_DEBUG_MUX, "pdu: type: %d tag: %d size=%d offset=%d\n",
+				pdu->id, pdu->tag, pdu->size, pdu->offset);
+
+	if (type)
+		*type = r_type;
+	if (tag)
+		*tag = r_tag;
+	if (size)
+		*size = r_size;
+
+
+rewind_and_exit:
+	if (rewind)
+		pdu->offset = offset;
+	return err;
+}
+EXPORT_SYMBOL(p9_parse_header);
+
+/**
+ * p9_check_errors - check 9p packet for error return and process it
+ * @c: current client instance
+ * @req: request to parse and check for error conditions
+ *
+ * returns error code if one is discovered, otherwise returns 0
+ *
+ * this will have to be more complicated if we have multiple
+ * error packet types
+ */
+
+static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
+{
+	int8_t type;
+	int err;
+
+	err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
+	if (err) {
+		P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
+		return err;
+	}
+
+	if (type == P9_RERROR) {
+		int ecode;
+		char *ename;
+
+		err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
+		if (err) {
+			P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
+									err);
+			return err;
+		}
+
+		if (c->dotu)
+			err = -ecode;
+
+		if (!err) {
+			err = p9_errstr2errno(ename, strlen(ename));
+
+			/* string match failed */
+			if (!err)
+				err = -ESERVERFAULT;
+		}
+
+		P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
+
+		kfree(ename);
+	} else
+		err = 0;
+
+	return err;
+}
+
+/**
+ * p9_client_flush - flush (cancel) a request
+ * c: client state
+ * req: request to cancel
+ *
+ * This sents a flush for a particular requests and links
+ * the flush request to the original request.  The current
+ * code only supports a single flush request although the protocol
+ * allows for multiple flush requests to be sent for a single request.
+ *
+ */
+
+static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
+{
+	struct p9_req_t *req;
+	int16_t oldtag;
+	int err;
+
+	err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
+	if (err)
+		return err;
+
+	P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
+
+	req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
+	if (IS_ERR(req))
+		return PTR_ERR(req);
+
+	req->flush_tag = oldtag;
+
+	/* we don't free anything here because RPC isn't complete */
+	return 0;
+}
+
 /**
  * p9_client_rpc - issue a request and wait for a response
  * @c: client session
- * @tc: &p9_fcall request to transmit
- * @rc: &p9_fcall to put reponse into
+ * @type: type of request
+ * @fmt: protocol format string (see protocol.c)
  *
- * Returns 0 on success, error code on failure
+ * Returns request structure (which client must free using p9_free_req)
  */
 
-static int
-p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, struct p9_fcall **rc)
+static struct p9_req_t *
+p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
 {
-	int tag, err, size;
-	char *rdata;
+	va_list ap;
+	int tag, err;
 	struct p9_req_t *req;
 	unsigned long flags;
 	int sigpending;
 	int flushed = 0;
 
-	P9_DPRINTK(P9_DEBUG_9P, "client %p tc %p rc %p\n", c, tc, rc);
+	P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
 
 	if (c->status != Connected)
-		return -EIO;
+		return ERR_PTR(-EIO);
 
 	if (signal_pending(current)) {
 		sigpending = 1;
@@ -395,50 +525,22 @@ p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, struct p9_fcall **rc)
 		sigpending = 0;
 
 	tag = P9_NOTAG;
-	if (tc->id != P9_TVERSION) {
+	if (type != P9_TVERSION) {
 		tag = p9_idpool_get(c->tagpool);
 		if (tag < 0)
-			return -ENOMEM;
+			return ERR_PTR(-ENOMEM);
 	}
 
 	req = p9_tag_alloc(c, tag);
+	if (IS_ERR(req))
+		return req;
 
-	/* if this is a flush request, backlink flush request now to
-	 * avoid race conditions later. */
-	if (tc->id == P9_TFLUSH) {
-		struct p9_req_t *other_req =
-				p9_tag_lookup(c, tc->params.tflush.oldtag);
-		if (other_req->status == REQ_STATUS_FLSH)
-			other_req->flush_tag = tag;
-	}
-
-	p9_set_tag(tc, tag);
-
-	/*
-	 * if client passed in a pre-allocated response fcall struct
-	 * then we just use that, otherwise we allocate one.
-	 */
-
-	if (rc == NULL)
-		req->rc = NULL;
-	else
-		req->rc = *rc;
-	if (req->rc == NULL) {
-		req->rc = kmalloc(sizeof(struct p9_fcall) + c->msize,
-								GFP_KERNEL);
-		if (!req->rc) {
-			err = -ENOMEM;
-			p9_idpool_put(tag, c->tagpool);
-			p9_free_req(c, req);
-			goto reterr;
-		}
-		*rc = req->rc;
-	}
-
-	rdata = (char *)req->rc+sizeof(struct p9_fcall);
-
-	req->tc = tc;
-	P9_DPRINTK(P9_DEBUG_9P, "request: tc: %p rc: %p\n", req->tc, req->rc);
+	/* marshall the data */
+	p9pdu_prepare(req->tc, tag, type);
+	va_start(ap, fmt);
+	err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
+	va_end(ap);
+	p9pdu_finalize(req->tc);
 
 	err = c->trans_mod->request(c, req);
 	if (err < 0) {
@@ -447,28 +549,28 @@ p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, struct p9_fcall **rc)
 	}
 
 	/* if it was a flush we just transmitted, return our tag */
-	if (tc->id == P9_TFLUSH)
-		return 0;
+	if (type == P9_TFLUSH)
+		return req;
 again:
-	P9_DPRINTK(P9_DEBUG_9P, "wait %p tag: %d\n", req->wq, tag);
+	P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
 	err = wait_event_interruptible(*req->wq,
 						req->status >= REQ_STATUS_RCVD);
-	P9_DPRINTK(P9_DEBUG_9P, "wait %p tag: %d returned %d (flushed=%d)\n",
+	P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d (flushed=%d)\n",
 						req->wq, tag, err, flushed);
 
 	if (req->status == REQ_STATUS_ERROR) {
-		P9_DPRINTK(P9_DEBUG_9P, "req_status error %d\n", req->t_err);
+		P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
 		err = req->t_err;
 	} else if (err == -ERESTARTSYS && flushed) {
-		P9_DPRINTK(P9_DEBUG_9P, "flushed - going again\n");
+		P9_DPRINTK(P9_DEBUG_MUX, "flushed - going again\n");
 		goto again;
 	} else if (req->status == REQ_STATUS_FLSHD) {
-		P9_DPRINTK(P9_DEBUG_9P, "flushed - erestartsys\n");
+		P9_DPRINTK(P9_DEBUG_MUX, "flushed - erestartsys\n");
 		err = -ERESTARTSYS;
 	}
 
 	if ((err == -ERESTARTSYS) && (c->status == Connected) && (!flushed)) {
-		P9_DPRINTK(P9_DEBUG_9P, "flushing\n");
+		P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
 		spin_lock_irqsave(&c->lock, flags);
 		if (req->status == REQ_STATUS_SENT)
 			req->status = REQ_STATUS_FLSH;
@@ -493,42 +595,17 @@ p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, struct p9_fcall **rc)
 	if (err < 0)
 		goto reterr;
 
-	size = le32_to_cpu(*(__le32 *) rdata);
-
-	err = p9_deserialize_fcall(rdata, size, req->rc, c->dotu);
-	if (err < 0) {
-		P9_DPRINTK(P9_DEBUG_9P,
-			"9p debug: client rpc deserialize returned %d\n", err);
-		goto reterr;
-	}
-
-	if (req->rc->id == P9_RERROR) {
-		int ecode = req->rc->params.rerror.errno;
-		struct p9_str *ename = &req->rc->params.rerror.error;
-
-		P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
-								ename->str);
-
-		if (c->dotu)
-			err = -ecode;
-
-		if (!err) {
-			err = p9_errstr2errno(ename->str, ename->len);
-
-			/* string match failed */
+	err = p9_check_errors(c, req);
 	if (!err) {
-				PRINT_FCALL_ERROR("unknown error", req->rc);
-				err = -ESERVERFAULT;
+		P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
+		return req;
 	}
-		}
-	} else
-		err = 0;
 
 reterr:
+	P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
+									err);
 	p9_free_req(c, req);
-
-	P9_DPRINTK(P9_DEBUG_9P, "returning %d\n", err);
-	return err;
+	return ERR_PTR(err);
 }
 
 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
@@ -536,7 +613,7 @@ static struct p9_fid *p9_fid_create(struct p9_client *clnt)
 	int err;
 	struct p9_fid *fid;
 
-	P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
+	P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
 	fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
 	if (!fid)
 		return ERR_PTR(-ENOMEM);
@@ -569,7 +646,7 @@ static void p9_fid_destroy(struct p9_fid *fid)
 {
 	struct p9_client *clnt;
 
-	P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
+	P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
 	clnt = fid->clnt;
 	p9_idpool_put(fid->fid, clnt->fidpool);
 	spin_lock(&clnt->lock);
@@ -578,49 +655,46 @@ static void p9_fid_destroy(struct p9_fid *fid)
 	kfree(fid);
 }
 
-static int p9_client_version(struct p9_client *clnt)
+int p9_client_version(struct p9_client *c)
 {
 	int err = 0;
-	struct p9_fcall *tc, *rc;
-	struct p9_str *version;
+	struct p9_req_t *req;
+	char *version;
+	int msize;
 
-	P9_DPRINTK(P9_DEBUG_9P, "%p\n", clnt);
-	err = 0;
-	tc = NULL;
-	rc = NULL;
-
-	tc = p9_create_tversion(clnt->msize,
-					clnt->dotu ? "9P2000.u" : "9P2000");
-	if (IS_ERR(tc)) {
-		err = PTR_ERR(tc);
-		tc = NULL;
-		goto error;
-	}
+	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");
+	if (IS_ERR(req))
+		return PTR_ERR(req);
 
-	err = p9_client_rpc(clnt, tc, &rc);
-	if (err)
+	err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version);
+	if (err) {
+		P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
 		goto error;
+	}
 
-	version = &rc->params.rversion.version;
-	if (version->len == 8 && !memcmp(version->str, "9P2000.u", 8))
-		clnt->dotu = 1;
-	else if (version->len == 6 && !memcmp(version->str, "9P2000", 6))
-		clnt->dotu = 0;
+	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;
 	else {
 		err = -EREMOTEIO;
 		goto error;
 	}
 
-	if (rc->params.rversion.msize < clnt->msize)
-		clnt->msize = rc->params.rversion.msize;
+	if (msize < c->msize)
+		c->msize = msize;
 
 error:
-	kfree(tc);
-	kfree(rc);
+	kfree(version);
+	p9_free_req(c, req);
 
 	return err;
 }
-EXPORT_SYMBOL(p9_client_auth);
+EXPORT_SYMBOL(p9_client_version);
 
 struct p9_client *p9_client_create(const char *dev_name, char *options)
 {
@@ -656,7 +730,7 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
 		goto error;
 	}
 
-	P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n",
+	P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
 		clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
 
 	err = clnt->trans_mod->create(clnt, dev_name, options);
@@ -682,7 +756,7 @@ void p9_client_destroy(struct p9_client *clnt)
 {
 	struct p9_fid *fid, *fidptr;
 
-	P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
+	P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
 
 	if (clnt->trans_mod)
 		clnt->trans_mod->close(clnt);
@@ -712,14 +786,13 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
 	char *uname, u32 n_uname, char *aname)
 {
 	int err;
-	struct p9_fcall *tc, *rc;
+	struct p9_req_t *req;
 	struct p9_fid *fid;
+	struct p9_qid qid;
 
-	P9_DPRINTK(P9_DEBUG_9P, "clnt %p afid %d uname %s aname %s\n",
-		clnt, afid?afid->fid:-1, uname, aname);
+	P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
+					afid ? afid->fid : -1, uname, aname);
 	err = 0;
-	tc = NULL;
-	rc = NULL;
 
 	fid = p9_fid_create(clnt);
 	if (IS_ERR(fid)) {
@@ -728,73 +801,75 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
 		goto error;
 	}
 
-	tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname,
-		n_uname, clnt->dotu);
-	if (IS_ERR(tc)) {
-		err = PTR_ERR(tc);
-		tc = NULL;
+	req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
+			afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
 		goto error;
 	}
 
-	err = p9_client_rpc(clnt, tc, &rc);
-	if (err)
+	err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
+	if (err) {
+		p9_free_req(clnt, req);
 		goto error;
+	}
+
+	P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
+					qid.type, qid.path, qid.version);
 
-	memmove(&fid->qid, &rc->params.rattach.qid, sizeof(struct p9_qid));
-	kfree(tc);
-	kfree(rc);
+	memmove(&fid->qid, &qid, sizeof(struct p9_qid));
+
+	p9_free_req(clnt, req);
 	return fid;
 
 error:
-	kfree(tc);
-	kfree(rc);
 	if (fid)
 		p9_fid_destroy(fid);
 	return ERR_PTR(err);
 }
 EXPORT_SYMBOL(p9_client_attach);
 
-struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname,
-	u32 n_uname, char *aname)
+struct p9_fid *
+p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
 {
 	int err;
-	struct p9_fcall *tc, *rc;
-	struct p9_fid *fid;
+	struct p9_req_t *req;
+	struct p9_qid qid;
+	struct p9_fid *afid;
 
-	P9_DPRINTK(P9_DEBUG_9P, "clnt %p uname %s aname %s\n", clnt, uname,
-									aname);
+	P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
 	err = 0;
-	tc = NULL;
-	rc = NULL;
 
-	fid = p9_fid_create(clnt);
-	if (IS_ERR(fid)) {
-		err = PTR_ERR(fid);
-		fid = NULL;
+	afid = p9_fid_create(clnt);
+	if (IS_ERR(afid)) {
+		err = PTR_ERR(afid);
+		afid = NULL;
 		goto error;
 	}
 
-	tc = p9_create_tauth(fid->fid, uname, aname, n_uname, clnt->dotu);
-	if (IS_ERR(tc)) {
-		err = PTR_ERR(tc);
-		tc = NULL;
+	req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
+			afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
 		goto error;
 	}
 
-	err = p9_client_rpc(clnt, tc, &rc);
-	if (err)
+	err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
+	if (err) {
+		p9_free_req(clnt, req);
 		goto error;
+	}
 
-	memmove(&fid->qid, &rc->params.rauth.qid, sizeof(struct p9_qid));
-	kfree(tc);
-	kfree(rc);
-	return fid;
+	P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
+					qid.type, qid.path, qid.version);
+
+	memmove(&afid->qid, &qid, sizeof(struct p9_qid));
+	p9_free_req(clnt, req);
+	return afid;
 
 error:
-	kfree(tc);
-	kfree(rc);
-	if (fid)
-		p9_fid_destroy(fid);
+	if (afid)
+		p9_fid_destroy(afid);
 	return ERR_PTR(err);
 }
 EXPORT_SYMBOL(p9_client_auth);
@@ -803,15 +878,13 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
 	int clone)
 {
 	int err;
-	struct p9_fcall *tc, *rc;
 	struct p9_client *clnt;
 	struct p9_fid *fid;
+	struct p9_qid *wqids;
+	struct p9_req_t *req;
+	int16_t nwqids, count;
 
-	P9_DPRINTK(P9_DEBUG_9P, "fid %d nwname %d wname[0] %s\n",
-		oldfid->fid, nwname, wnames?wnames[0]:NULL);
 	err = 0;
-	tc = NULL;
-	rc = NULL;
 	clnt = oldfid->clnt;
 	if (clone) {
 		fid = p9_fid_create(clnt);
@@ -825,53 +898,46 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
 	} else
 		fid = oldfid;
 
-	tc = p9_create_twalk(oldfid->fid, fid->fid, nwname, wnames);
-	if (IS_ERR(tc)) {
-		err = PTR_ERR(tc);
-		tc = NULL;
+
+	P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
+		oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
+
+	req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
+								nwname, wnames);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
 		goto error;
 	}
 
-	err = p9_client_rpc(clnt, tc, &rc);
-	if (err) {
-		if (rc && rc->id == P9_RWALK)
+	err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids);
+	p9_free_req(clnt, req);
+	if (err)
 		goto clunk_fid;
-		else
-			goto error;
-	}
 
-	if (rc->params.rwalk.nwqid != nwname) {
+	P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
+
+	if (nwqids != nwname) {
 		err = -ENOENT;
 		goto clunk_fid;
 	}
 
+	for (count = 0; count < nwqids; count++)
+		P9_DPRINTK(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
+			count, wqids[count].type, wqids[count].path,
+			wqids[count].version);
+
 	if (nwname)
-		memmove(&fid->qid,
-			&rc->params.rwalk.wqids[rc->params.rwalk.nwqid - 1],
-			sizeof(struct p9_qid));
+		memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
 	else
 		fid->qid = oldfid->qid;
 
-	kfree(tc);
-	kfree(rc);
 	return fid;
 
 clunk_fid:
-	kfree(tc);
-	kfree(rc);
-	rc = NULL;
-	tc = p9_create_tclunk(fid->fid);
-	if (IS_ERR(tc)) {
-		err = PTR_ERR(tc);
-		tc = NULL;
-		goto error;
-	}
-
-	p9_client_rpc(clnt, tc, &rc);
+	p9_client_clunk(fid);
+	fid = NULL;
 
 error:
-	kfree(tc);
-	kfree(rc);
 	if (fid && (fid != oldfid))
 		p9_fid_destroy(fid);
 
@@ -882,35 +948,36 @@ EXPORT_SYMBOL(p9_client_walk);
 int p9_client_open(struct p9_fid *fid, int mode)
 {
 	int err;
-	struct p9_fcall *tc, *rc;
 	struct p9_client *clnt;
+	struct p9_req_t *req;
+	struct p9_qid qid;
+	int iounit;
 
-	P9_DPRINTK(P9_DEBUG_9P, "fid %d mode %d\n", fid->fid, mode);
+	P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
 	err = 0;
-	tc = NULL;
-	rc = NULL;
 	clnt = fid->clnt;
 
 	if (fid->mode != -1)
 		return -EINVAL;
 
-	tc = p9_create_topen(fid->fid, mode);
-	if (IS_ERR(tc)) {
-		err = PTR_ERR(tc);
-		tc = NULL;
-		goto done;
+	req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
+		goto error;
 	}
 
-	err = p9_client_rpc(clnt, tc, &rc);
+	err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
+	p9_free_req(clnt, req);
 	if (err)
-		goto done;
+		goto error;
+
+	P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
+				qid.type, qid.path, qid.version, iounit);
 
 	fid->mode = mode;
-	fid->iounit = rc->params.ropen.iounit;
+	fid->iounit = iounit;
 
-done:
-	kfree(tc);
-	kfree(rc);
+error:
 	return err;
 }
 EXPORT_SYMBOL(p9_client_open);
@@ -919,37 +986,38 @@ int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
 		     char *extension)
 {
 	int err;
-	struct p9_fcall *tc, *rc;
 	struct p9_client *clnt;
+	struct p9_req_t *req;
+	struct p9_qid qid;
+	int iounit;
 
-	P9_DPRINTK(P9_DEBUG_9P, "fid %d name %s perm %d mode %d\n", fid->fid,
-		name, perm, mode);
+	P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
+						fid->fid, name, perm, mode);
 	err = 0;
-	tc = NULL;
-	rc = NULL;
 	clnt = fid->clnt;
 
 	if (fid->mode != -1)
 		return -EINVAL;
 
-	tc = p9_create_tcreate(fid->fid, name, perm, mode, extension,
-							       clnt->dotu);
-	if (IS_ERR(tc)) {
-		err = PTR_ERR(tc);
-		tc = NULL;
-		goto done;
+	req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
+				mode, extension);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
+		goto error;
 	}
 
-	err = p9_client_rpc(clnt, tc, &rc);
+	err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
+	p9_free_req(clnt, req);
 	if (err)
-		goto done;
+		goto error;
+
+	P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
+				qid.type, qid.path, qid.version, iounit);
 
 	fid->mode = mode;
-	fid->iounit = rc->params.ropen.iounit;
+	fid->iounit = iounit;
 
-done:
-	kfree(tc);
-	kfree(rc);
+error:
 	return err;
 }
 EXPORT_SYMBOL(p9_client_fcreate);
@@ -957,31 +1025,25 @@ EXPORT_SYMBOL(p9_client_fcreate);
 int p9_client_clunk(struct p9_fid *fid)
 {
 	int err;
-	struct p9_fcall *tc, *rc;
 	struct p9_client *clnt;
+	struct p9_req_t *req;
 
-	P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
+	P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
 	err = 0;
-	tc = NULL;
-	rc = NULL;
 	clnt = fid->clnt;
 
-	tc = p9_create_tclunk(fid->fid);
-	if (IS_ERR(tc)) {
-		err = PTR_ERR(tc);
-		tc = NULL;
-		goto done;
+	req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
+		goto error;
 	}
 
-	err = p9_client_rpc(clnt, tc, &rc);
-	if (err)
-		goto done;
+	P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
 
+	p9_free_req(clnt, req);
 	p9_fid_destroy(fid);
 
-done:
-	kfree(tc);
-	kfree(rc);
+error:
 	return err;
 }
 EXPORT_SYMBOL(p9_client_clunk);
@@ -989,31 +1051,25 @@ EXPORT_SYMBOL(p9_client_clunk);
 int p9_client_remove(struct p9_fid *fid)
 {
 	int err;
-	struct p9_fcall *tc, *rc;
 	struct p9_client *clnt;
+	struct p9_req_t *req;
 
-	P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
+	P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
 	err = 0;
-	tc = NULL;
-	rc = NULL;
 	clnt = fid->clnt;
 
-	tc = p9_create_tremove(fid->fid);
-	if (IS_ERR(tc)) {
-		err = PTR_ERR(tc);
-		tc = NULL;
-		goto done;
+	req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
+		goto error;
 	}
 
-	err = p9_client_rpc(clnt, tc, &rc);
-	if (err)
-		goto done;
+	P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
 
+	p9_free_req(clnt, req);
 	p9_fid_destroy(fid);
 
-done:
-	kfree(tc);
-	kfree(rc);
+error:
 	return err;
 }
 EXPORT_SYMBOL(p9_client_remove);
@@ -1022,15 +1078,14 @@ int
 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
 								u32 count)
 {
-	int err, n, rsize, total;
-	struct p9_fcall *tc, *rc;
+	int err, rsize, total;
 	struct p9_client *clnt;
+	struct p9_req_t *req;
+	char *dataptr;
 
-	P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu %d\n", fid->fid,
+	P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
 					(long long unsigned) offset, count);
 	err = 0;
-	tc = NULL;
-	rc = NULL;
 	clnt = fid->clnt;
 	total = 0;
 
@@ -1038,53 +1093,40 @@ p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
 	if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
 		rsize = clnt->msize - P9_IOHDRSZ;
 
-	do {
 	if (count < rsize)
 		rsize = count;
 
-		tc = p9_create_tread(fid->fid, offset, rsize);
-		if (IS_ERR(tc)) {
-			err = PTR_ERR(tc);
-			tc = NULL;
+	req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
 		goto error;
 	}
 
-		err = p9_client_rpc(clnt, tc, &rc);
+	err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr);
 	if (err)
-			goto error;
+		goto free_and_error;
 
-		n = rc->params.rread.count;
-		if (n > count)
-			n = count;
+	P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
 
 	if (data) {
-			memmove(data, rc->params.rread.data, n);
-			data += n;
+		memmove(data, dataptr, count);
+		data += count;
 	}
 
 	if (udata) {
-			err = copy_to_user(udata, rc->params.rread.data, n);
+		err = copy_to_user(udata, dataptr, count);
 		if (err) {
 			err = -EFAULT;
-				goto error;
+			goto free_and_error;
 		}
-			udata += n;
 	}
 
-		count -= n;
-		offset += n;
-		total += n;
-		kfree(tc);
-		tc = NULL;
-		kfree(rc);
-		rc = NULL;
-	} while (count > 0 && n == rsize);
-
-	return total;
+	p9_free_req(clnt, req);
+	return count;
 
+free_and_error:
+	p9_free_req(clnt, req);
 error:
-	kfree(tc);
-	kfree(rc);
 	return err;
 }
 EXPORT_SYMBOL(p9_client_read);
@@ -1093,15 +1135,13 @@ int
 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
 							u64 offset, u32 count)
 {
-	int err, n, rsize, total;
-	struct p9_fcall *tc, *rc;
+	int err, rsize, total;
 	struct p9_client *clnt;
+	struct p9_req_t *req;
 
-	P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
-					(long long unsigned) offset, count);
+	P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
+				fid->fid, (long long unsigned) offset, count);
 	err = 0;
-	tc = NULL;
-	rc = NULL;
 	clnt = fid->clnt;
 	total = 0;
 
@@ -1109,129 +1149,70 @@ p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
 	if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
 		rsize = clnt->msize - P9_IOHDRSZ;
 
-	do {
 	if (count < rsize)
 		rsize = count;
-
 	if (data)
-			tc = p9_create_twrite(fid->fid, offset, rsize, data);
+		req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
+								rsize, data);
 	else
-			tc = p9_create_twrite_u(fid->fid, offset, rsize, udata);
-		if (IS_ERR(tc)) {
-			err = PTR_ERR(tc);
-			tc = NULL;
+		req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
+								rsize, udata);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
 		goto error;
 	}
 
-		err = p9_client_rpc(clnt, tc, &rc);
+	err = p9pdu_readf(req->rc, clnt->dotu, "d", &count);
 	if (err)
-			goto error;
-
-		n = rc->params.rread.count;
-		count -= n;
-
-		if (data)
-			data += n;
-		else
-			udata += n;
-
-		offset += n;
-		total += n;
-		kfree(tc);
-		tc = NULL;
-		kfree(rc);
-		rc = NULL;
-	} while (count > 0);
+		goto free_and_error;
+	P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
 
-	return total;
+	p9_free_req(clnt, req);
+	return count;
 
+free_and_error:
+	p9_free_req(clnt, req);
 error:
-	kfree(tc);
-	kfree(rc);
 	return err;
 }
 EXPORT_SYMBOL(p9_client_write);
 
-static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu)
+struct p9_wstat *p9_client_stat(struct p9_fid *fid)
 {
-	int n;
-	char *p;
-	struct p9_stat *ret;
-
-	n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len +
-		st->muid.len;
+	int err;
+	struct p9_client *clnt;
+	struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
+	struct p9_req_t *req;
+	u16 ignored;
 
-	if (dotu)
-		n += st->extension.len;
+	P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
 
-	ret = kmalloc(n, GFP_KERNEL);
 	if (!ret)
 		return ERR_PTR(-ENOMEM);
 
-	memmove(ret, st, sizeof(struct p9_stat));
-	p = ((char *) ret) + sizeof(struct p9_stat);
-	memmove(p, st->name.str, st->name.len);
-	ret->name.str = p;
-	p += st->name.len;
-	memmove(p, st->uid.str, st->uid.len);
-	ret->uid.str = p;
-	p += st->uid.len;
-	memmove(p, st->gid.str, st->gid.len);
-	ret->gid.str = p;
-	p += st->gid.len;
-	memmove(p, st->muid.str, st->muid.len);
-	ret->muid.str = p;
-	p += st->muid.len;
-
-	if (dotu) {
-		memmove(p, st->extension.str, st->extension.len);
-		ret->extension.str = p;
-		p += st->extension.len;
-	}
-
-	return ret;
-}
-
-struct p9_stat *p9_client_stat(struct p9_fid *fid)
-{
-	int err;
-	struct p9_fcall *tc, *rc;
-	struct p9_client *clnt;
-	struct p9_stat *ret;
-
-	P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
 	err = 0;
-	tc = NULL;
-	rc = NULL;
-	ret = NULL;
 	clnt = fid->clnt;
 
-	tc = p9_create_tstat(fid->fid);
-	if (IS_ERR(tc)) {
-		err = PTR_ERR(tc);
-		tc = NULL;
+	req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
 		goto error;
 	}
 
-	err = p9_client_rpc(clnt, tc, &rc);
+	err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret);
+	p9_free_req(clnt, req);
 	if (err)
 		goto error;
 
-	ret = p9_clone_stat(&rc->params.rstat.stat, clnt->dotu);
-	if (IS_ERR(ret)) {
-		err = PTR_ERR(ret);
-		ret = NULL;
-		goto error;
-	}
+	P9_DPRINTK(P9_DEBUG_9P,
+		"<<< RSTAT sz=%x type=%x dev=%x qid=%2.2x %4.4x %8.8llx"
+		" mode=%8.8x uid=%d gid=%d size=%lld %s\n",
+		ret->size, ret->type, ret->dev, ret->qid.type,
+		ret->qid.version, ret->qid.path, ret->mode,
+		ret->n_uid, ret->n_gid, ret->length, ret->name);
 
-	kfree(tc);
-	kfree(rc);
 	return ret;
-
 error:
-	kfree(tc);
-	kfree(rc);
-	kfree(ret);
 	return ERR_PTR(err);
 }
 EXPORT_SYMBOL(p9_client_stat);
@@ -1239,27 +1220,23 @@ EXPORT_SYMBOL(p9_client_stat);
 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
 {
 	int err;
-	struct p9_fcall *tc, *rc;
+	struct p9_req_t *req;
 	struct p9_client *clnt;
 
-	P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
+	P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
 	err = 0;
-	tc = NULL;
-	rc = NULL;
 	clnt = fid->clnt;
 
-	tc = p9_create_twstat(fid->fid, wst, clnt->dotu);
-	if (IS_ERR(tc)) {
-		err = PTR_ERR(tc);
-		tc = NULL;
-		goto done;
+	req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, 0, wst);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
+		goto error;
 	}
 
-	err = p9_client_rpc(clnt, tc, &rc);
+	P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
 
-done:
-	kfree(tc);
-	kfree(rc);
+	p9_free_req(clnt, req);
+error:
 	return err;
 }
 EXPORT_SYMBOL(p9_client_wstat);

net/9p/protocol.c

@@ -27,6 +27,7 @@
 
 #include <linux/module.h>
 #include <linux/errno.h>
+#include <linux/uaccess.h>
 #include <net/9p/9p.h>
 #include <net/9p/client.h>
 #include "protocol.h"
@@ -51,6 +52,38 @@
 static int
 p9pdu_writef(struct p9_fcall *pdu, int optional, const char *fmt, ...);
 
+#define PACKET_DEBUG 0
+
+void
+p9pdu_dump(int way, struct p9_fcall *pdu)
+{
+	int i, n;
+	u8 *data = pdu->sdata;
+	int datalen = pdu->size;
+	char buf[255];
+	int buflen = 255;
+
+	i = n = 0;
+	if (datalen > (buflen-16))
+		datalen = buflen-16;
+	while (i < datalen) {
+		n += scnprintf(buf + n, buflen - n, "%02x ", data[i]);
+		if (i%4 == 3)
+			n += scnprintf(buf + n, buflen - n, " ");
+		if (i%32 == 31)
+			n += scnprintf(buf + n, buflen - n, "\n");
+
+		i++;
+	}
+	n += scnprintf(buf + n, buflen - n, "\n");
+
+	if (way)
+		printk(KERN_NOTICE "[[(%d)[ %s\n", datalen, buf);
+	else
+		printk(KERN_NOTICE "]](%d)] %s\n", datalen, buf);
+}
+EXPORT_SYMBOL(p9pdu_dump);
+
 void p9stat_free(struct p9_wstat *stbuf)
 {
 	kfree(stbuf->name);
@@ -77,6 +110,18 @@ static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size)
 	return size - len;
 }
 
+static size_t
+pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size)
+{
+	size_t len = MIN(pdu->capacity - pdu->size, size);
+	int err = copy_from_user(&pdu->sdata[pdu->size], udata, len);
+	if (err)
+		printk(KERN_WARNING "pdu_write_u returning: %d\n", err);
+
+	pdu->size += len;
+	return size - len;
+}
+
 /*
 	b - int8_t
 	w - int16_t
@@ -174,7 +219,6 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
 				stbuf->extension = NULL;
 				stbuf->n_uid = stbuf->n_gid = stbuf->n_muid =
 				    -1;
-
 				errcode =
 				    p9pdu_readf(pdu, optional,
 						"wwdQdddqssss?sddd",
@@ -332,7 +376,6 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
 		case 's':{
 				const char *ptr = va_arg(ap, const char *);
 				int16_t len = 0;
-
 				if (ptr)
 					len = MIN(strlen(ptr), USHORT_MAX);
 
@@ -356,7 +399,7 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
 				    p9pdu_writef(pdu, optional,
 						 "wwdQdddqssss?sddd",
 						 stbuf->size, stbuf->type,
-						 stbuf->dev, stbuf->qid,
+						 stbuf->dev, &stbuf->qid,
 						 stbuf->mode, stbuf->atime,
 						 stbuf->mtime, stbuf->length,
 						 stbuf->name, stbuf->uid,
@@ -374,6 +417,16 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
 					errcode = -EFAULT;
 			}
 			break;
+		case 'U':{
+				int32_t count = va_arg(ap, int32_t);
+				const char __user *udata =
+						va_arg(ap, const void *);
+				errcode =
+				    p9pdu_writef(pdu, optional, "d", count);
+				if (!errcode && pdu_write_u(pdu, udata, count))
+					errcode = -EFAULT;
+			}
+			break;
 		case 'T':{
 				int16_t nwname = va_arg(ap, int);
 				const char **wnames = va_arg(ap, const char **);
@@ -455,3 +508,29 @@ p9pdu_writef(struct p9_fcall *pdu, int optional, const char *fmt, ...)
 
 	return ret;
 }
+
+int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type)
+{
+	return p9pdu_writef(pdu, 0, "dbw", 0, type, tag);
+}
+
+int p9pdu_finalize(struct p9_fcall *pdu)
+{
+	int size = pdu->size;
+	int err;
+
+	pdu->size = 0;
+	err = p9pdu_writef(pdu, 0, "d", size);
+	pdu->size = size;
+
+	if (PACKET_DEBUG)
+		p9pdu_dump(0, pdu);
+
+	return err;
+}
+
+void p9pdu_reset(struct p9_fcall *pdu)
+{
+	pdu->offset = 0;
+	pdu->size = 0;
+}

net/9p/protocol.h

@@ -27,5 +27,8 @@
 
 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_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 *);
+void p9pdu_reset(struct p9_fcall *pdu);

net/9p/trans_fd.c

@@ -181,7 +181,7 @@ static void p9_mux_poll_stop(struct p9_conn *m)
  *
  */
 
-void p9_conn_cancel(struct p9_conn *m, int err)
+static void p9_conn_cancel(struct p9_conn *m, int err)
 {
 	struct p9_req_t *req, *rtmp;
 	unsigned long flags;
@@ -287,7 +287,7 @@ static void p9_read_work(struct work_struct *work)
 	if (m->err < 0)
 		return;
 
-	P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
+	P9_DPRINTK(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos);
 
 	if (!m->rbuf) {
 		m->rbuf = m->tmp_buf;
@@ -296,11 +296,11 @@ static void p9_read_work(struct work_struct *work)
 	}
 
 	clear_bit(Rpending, &m->wsched);
-	P9_DPRINTK(P9_DEBUG_MUX, "read mux %p pos %d size: %d = %d\n", m,
+	P9_DPRINTK(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n", m,
 					m->rpos, m->rsize, m->rsize-m->rpos);
 	err = p9_fd_read(m->client, m->rbuf + m->rpos,
 						m->rsize - m->rpos);
-	P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
+	P9_DPRINTK(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
 	if (err == -EAGAIN) {
 		clear_bit(Rworksched, &m->wsched);
 		return;
@@ -313,7 +313,7 @@ static void p9_read_work(struct work_struct *work)
 
 	if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */
 		u16 tag;
-		P9_DPRINTK(P9_DEBUG_MUX, "got new header\n");
+		P9_DPRINTK(P9_DEBUG_TRANS, "got new header\n");
 
 		n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */
 		if (n >= m->client->msize) {
@@ -324,8 +324,8 @@ static void p9_read_work(struct work_struct *work)
 		}
 
 		tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */
-		P9_DPRINTK(P9_DEBUG_MUX, "mux %p pkt: size: %d bytes tag: %d\n",
-								 m, n, tag);
+		P9_DPRINTK(P9_DEBUG_TRANS,
+			"mux %p pkt: size: %d bytes tag: %d\n", m, n, tag);
 
 		m->req = p9_tag_lookup(m->client, tag);
 		if (!m->req) {
@@ -351,7 +351,7 @@ static void p9_read_work(struct work_struct *work)
 
 	/* not an else because some packets (like clunk) have no payload */
 	if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */
-		P9_DPRINTK(P9_DEBUG_MUX, "got new packet\n");
+		P9_DPRINTK(P9_DEBUG_TRANS, "got new packet\n");
 
 		list_del(&m->req->req_list);
 		p9_client_cb(m->client, m->req);
@@ -369,7 +369,7 @@ static void p9_read_work(struct work_struct *work)
 			n = p9_fd_poll(m->client, NULL);
 
 		if (n & POLLIN) {
-			P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
+			P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m);
 			queue_work(p9_mux_wq, &m->rq);
 		} else
 			clear_bit(Rworksched, &m->wsched);
@@ -453,11 +453,11 @@ static void p9_write_work(struct work_struct *work)
 		spin_unlock(&m->client->lock);
 	}
 
-	P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos,
+	P9_DPRINTK(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", m, m->wpos,
 								m->wsize);
 	clear_bit(Wpending, &m->wsched);
 	err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
-	P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
+	P9_DPRINTK(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
 	if (err == -EAGAIN) {
 		clear_bit(Wworksched, &m->wsched);
 		return;
@@ -481,7 +481,7 @@ static void p9_write_work(struct work_struct *work)
 			n = p9_fd_poll(m->client, NULL);
 
 		if (n & POLLOUT) {
-			P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
+			P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m);
 			queue_work(p9_mux_wq, &m->wq);
 		} else
 			clear_bit(Wworksched, &m->wsched);
@@ -558,7 +558,8 @@ static struct p9_conn *p9_conn_create(struct p9_client *client)
 	int n;
 	struct p9_conn *m;
 
-	P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize);
+	P9_DPRINTK(P9_DEBUG_TRANS, "client %p msize %d\n", client,
+								client->msize);
 	m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
 	if (!m)
 		return ERR_PTR(-ENOMEM);
@@ -575,12 +576,12 @@ static struct p9_conn *p9_conn_create(struct p9_client *client)
 
 	n = p9_fd_poll(client, &m->pt);
 	if (n & POLLIN) {
-		P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
+		P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m);
 		set_bit(Rpending, &m->wsched);
 	}
 
 	if (n & POLLOUT) {
-		P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
+		P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m);
 		set_bit(Wpending, &m->wsched);
 	}
 
@@ -602,7 +603,7 @@ static void p9_poll_mux(struct p9_conn *m)
 
 	n = p9_fd_poll(m->client, NULL);
 	if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
-		P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n);
+		P9_DPRINTK(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
 		if (n >= 0)
 			n = -ECONNRESET;
 		p9_conn_cancel(m, n);
@@ -610,19 +611,19 @@ static void p9_poll_mux(struct p9_conn *m)
 
 	if (n & POLLIN) {
 		set_bit(Rpending, &m->wsched);
-		P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
+		P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m);
 		if (!test_and_set_bit(Rworksched, &m->wsched)) {
-			P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
+			P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m);
 			queue_work(p9_mux_wq, &m->rq);
 		}
 	}
 
 	if (n & POLLOUT) {
 		set_bit(Wpending, &m->wsched);
-		P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
+		P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m);
 		if ((m->wsize || !list_empty(&m->unsent_req_list))
 		    && !test_and_set_bit(Wworksched, &m->wsched)) {
-			P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
+			P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m);
 			queue_work(p9_mux_wq, &m->wq);
 		}
 	}
@@ -645,8 +646,8 @@ static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
 	struct p9_trans_fd *ts = client->trans;
 	struct p9_conn *m = ts->conn;
 
-	P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
-		req->tc, req->tc->id);
+	P9_DPRINTK(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", m,
+						current, req->tc, req->tc->id);
 	if (m->err < 0)
 		return m->err;
 
@@ -672,19 +673,12 @@ static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
 	struct p9_trans_fd *ts = client->trans;
 	struct p9_conn *m = ts->conn;
 
-	P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p\n", m, req);
+	P9_DPRINTK(P9_DEBUG_TRANS, "mux %p req %p\n", m, req);
 
 	spin_lock(&client->lock);
 	list_del(&req->req_list);
 	spin_unlock(&client->lock);
 
-	/* if a response was received for a request, do nothing */
-	if (req->rc || req->t_err) {
-		P9_DPRINTK(P9_DEBUG_MUX,
-			"mux %p req %p response already received\n", m, req);
-		return 0;
-	}
-
 	if (req->status == REQ_STATUS_UNSENT) {
 		req->status = REQ_STATUS_FLSHD;
 		return 0;
@@ -809,7 +803,7 @@ static int p9_socket_open(struct p9_client *client, struct socket *csocket)
 
 static void p9_conn_destroy(struct p9_conn *m)
 {
-	P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
+	P9_DPRINTK(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", m,
 		m->mux_list.prev, m->mux_list.next);
 
 	p9_mux_poll_stop(m);
@@ -1060,7 +1054,7 @@ static int p9_poll_proc(void *a)
 {
 	unsigned long flags;
 
-	P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current);
+	P9_DPRINTK(P9_DEBUG_TRANS, "start %p\n", current);
  repeat:
 	spin_lock_irqsave(&p9_poll_lock, flags);
 	while (!list_empty(&p9_poll_pending_list)) {
@@ -1078,7 +1072,7 @@ static int p9_poll_proc(void *a)
 
 	set_current_state(TASK_INTERRUPTIBLE);
 	if (list_empty(&p9_poll_pending_list)) {
-		P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n");
+		P9_DPRINTK(P9_DEBUG_TRANS, "sleeping...\n");
 		schedule();
 	}
 	__set_current_state(TASK_RUNNING);
@@ -1086,7 +1080,7 @@ static int p9_poll_proc(void *a)
 	if (!kthread_should_stop())
 		goto repeat;
 
-	P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
+	P9_DPRINTK(P9_DEBUG_TRANS, "finish\n");
 	return 0;
 }
 

net/9p/util.c

@@ -105,6 +105,7 @@ int p9_idpool_get(struct p9_idpool *p)
 	else if (error)
 		return -1;
 
+	P9_DPRINTK(P9_DEBUG_MUX, " id %d pool %p\n", i, p);
 	return i;
 }
 EXPORT_SYMBOL(p9_idpool_get);
@@ -121,6 +122,9 @@ EXPORT_SYMBOL(p9_idpool_get);
 void p9_idpool_put(int id, struct p9_idpool *p)
 {
 	unsigned long flags;
+
+	P9_DPRINTK(P9_DEBUG_MUX, " id %d pool %p\n", id, p);
+
 	spin_lock_irqsave(&p->lock, flags);
 	idr_remove(&p->pool, id);
 	spin_unlock_irqrestore(&p->lock, flags);