Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
  9p: fix p9_client_destroy unconditional calling v9fs_put_trans
  9p: fix memory leak in v9fs_parse_options()
  9p: Fix the kernel crash on a failed mount
  9p: fix option parsing
  9p: Include fsync support for 9p client
  net/9p: fix statsize inside twstat
  net/9p: fail when user specifies a transport which we can't find
  net/9p: fix virtio transport to correctly update status on connect

8 files changed, 91 insertions, 40 deletions

diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index cf62b05e296a..7d6c2139891d 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -84,7 +84,7 @@ static const match_table_t tokens = {
 
 static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
 {
-	char *options;
+	char *options, *tmp_options;
 	substring_t args[MAX_OPT_ARGS];
 	char *p;
 	int option = 0;
@@ -102,9 +102,12 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
 	if (!opts)
 		return 0;
 
-	options = kstrdup(opts, GFP_KERNEL);
-	if (!options)
+	tmp_options = kstrdup(opts, GFP_KERNEL);
+	if (!tmp_options) {
+		ret = -ENOMEM;
 		goto fail_option_alloc;
+	}
+	options = tmp_options;
 
 	while ((p = strsep(&options, ",")) != NULL) {
 		int token;
@@ -159,8 +162,12 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
 			break;
 		case Opt_cache:
 			s = match_strdup(&args[0]);
-			if (!s)
-				goto fail_option_alloc;
+			if (!s) {
+				ret = -ENOMEM;
+				P9_DPRINTK(P9_DEBUG_ERROR,
+				  "problem allocating copy of cache arg\n");
+				goto free_and_return;
+			}
 
 			if (strcmp(s, "loose") == 0)
 				v9ses->cache = CACHE_LOOSE;
@@ -173,8 +180,12 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
 
 		case Opt_access:
 			s = match_strdup(&args[0]);
-			if (!s)
-				goto fail_option_alloc;
+			if (!s) {
+				ret = -ENOMEM;
+				P9_DPRINTK(P9_DEBUG_ERROR,
+				  "problem allocating copy of access arg\n");
+				goto free_and_return;
+			}
 
 			v9ses->flags &= ~V9FS_ACCESS_MASK;
 			if (strcmp(s, "user") == 0)
@@ -194,13 +205,11 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
 			continue;
 		}
 	}
-	kfree(options);
-	return ret;
 
+free_and_return:
+	kfree(tmp_options);
 fail_option_alloc:
-	P9_DPRINTK(P9_DEBUG_ERROR,
-		   "failed to allocate copy of option argument\n");
-	return -ENOMEM;
+	return ret;
 }
 
 /**
diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h
index 3a7560e35865..ed835836e0dc 100644
--- a/fs/9p/v9fs_vfs.h
+++ b/fs/9p/v9fs_vfs.h
@@ -60,3 +60,4 @@ void v9fs_dentry_release(struct dentry *);
 int v9fs_uflags2omode(int uflags, int extended);
 
 ssize_t v9fs_file_readn(struct file *, char *, char __user *, u32, u64);
+void v9fs_blank_wstat(struct p9_wstat *wstat);
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 3902bf43a088..74a0461a9ac0 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -257,6 +257,23 @@ v9fs_file_write(struct file *filp, const char __user * data,
 	return total;
 }
 
+static int v9fs_file_fsync(struct file *filp, struct dentry *dentry,
+					int datasync)
+{
+	struct p9_fid *fid;
+	struct p9_wstat wstat;
+	int retval;
+
+	P9_DPRINTK(P9_DEBUG_VFS, "filp %p dentry %p datasync %x\n", filp,
+						dentry, datasync);
+
+	fid = filp->private_data;
+	v9fs_blank_wstat(&wstat);
+
+	retval = p9_client_wstat(fid, &wstat);
+	return retval;
+}
+
 static const struct file_operations v9fs_cached_file_operations = {
 	.llseek = generic_file_llseek,
 	.read = do_sync_read,
@@ -266,6 +283,7 @@ static const struct file_operations v9fs_cached_file_operations = {
 	.release = v9fs_dir_release,
 	.lock = v9fs_file_lock,
 	.mmap = generic_file_readonly_mmap,
+	.fsync = v9fs_file_fsync,
 };
 
 const struct file_operations v9fs_file_operations = {
@@ -276,4 +294,5 @@ const struct file_operations v9fs_file_operations = {
 	.release = v9fs_dir_release,
 	.lock = v9fs_file_lock,
 	.mmap = generic_file_readonly_mmap,
+	.fsync = v9fs_file_fsync,
 };
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 9d03d1ebca6f..a407fa3388c0 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -176,7 +176,7 @@ int v9fs_uflags2omode(int uflags, int extended)
  *
  */
 
-static void
+void
 v9fs_blank_wstat(struct p9_wstat *wstat)
 {
 	wstat->type = ~0;
diff --git a/net/9p/client.c b/net/9p/client.c
index 8af95b2dddd6..09d4f1e2e4a8 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -69,7 +69,7 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
 
 static int parse_opts(char *opts, struct p9_client *clnt)
 {
-	char *options;
+	char *options, *tmp_options;
 	char *p;
 	substring_t args[MAX_OPT_ARGS];
 	int option;
@@ -81,12 +81,13 @@ static int parse_opts(char *opts, struct p9_client *clnt)
 	if (!opts)
 		return 0;
 
-	options = kstrdup(opts, GFP_KERNEL);
-	if (!options) {
+	tmp_options = kstrdup(opts, GFP_KERNEL);
+	if (!tmp_options) {
 		P9_DPRINTK(P9_DEBUG_ERROR,
 				"failed to allocate copy of option string\n");
 		return -ENOMEM;
 	}
+	options = tmp_options;
 
 	while ((p = strsep(&options, ",")) != NULL) {
 		int token;
@@ -108,6 +109,13 @@ static int parse_opts(char *opts, struct p9_client *clnt)
 			break;
 		case Opt_trans:
 			clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
+			if(clnt->trans_mod == NULL) {
+				P9_DPRINTK(P9_DEBUG_ERROR,
+				   "Could not find request transport: %s\n",
+				   (char *) &args[0]);
+				ret = -EINVAL;
+				goto free_and_return;
+			}
 			break;
 		case Opt_legacy:
 			clnt->dotu = 0;
@@ -117,7 +125,8 @@ static int parse_opts(char *opts, struct p9_client *clnt)
 		}
 	}
 
-	kfree(options);
+free_and_return:
+	kfree(tmp_options);
 	return ret;
 }
 
@@ -667,18 +676,12 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
 	clnt->trans = NULL;
 	spin_lock_init(&clnt->lock);
 	INIT_LIST_HEAD(&clnt->fidlist);
-	clnt->fidpool = p9_idpool_create();
-	if (IS_ERR(clnt->fidpool)) {
-		err = PTR_ERR(clnt->fidpool);
-		clnt->fidpool = NULL;
-		goto error;
-	}
 
 	p9_tag_init(clnt);
 
 	err = parse_opts(options, clnt);
 	if (err < 0)
-		goto error;
+		goto free_client;
 
 	if (!clnt->trans_mod)
 		clnt->trans_mod = v9fs_get_default_trans();
@@ -687,7 +690,14 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
 		err = -EPROTONOSUPPORT;
 		P9_DPRINTK(P9_DEBUG_ERROR,
 				"No transport defined or default transport\n");
-		goto error;
+		goto free_client;
+	}
+
+	clnt->fidpool = p9_idpool_create();
+	if (IS_ERR(clnt->fidpool)) {
+		err = PTR_ERR(clnt->fidpool);
+		clnt->fidpool = NULL;
+		goto put_trans;
 	}
 
 	P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
@@ -695,19 +705,25 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
 
 	err = clnt->trans_mod->create(clnt, dev_name, options);
 	if (err)
-		goto error;
+		goto destroy_fidpool;
 
 	if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
 		clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
 
 	err = p9_client_version(clnt);
 	if (err)
-		goto error;
+		goto close_trans;
 
 	return clnt;
 
-error:
-	p9_client_destroy(clnt);
+close_trans:
+	clnt->trans_mod->close(clnt);
+destroy_fidpool:
+	p9_idpool_destroy(clnt->fidpool);
+put_trans:
+	v9fs_put_trans(clnt->trans_mod);
+free_client:
+	kfree(clnt);
 	return ERR_PTR(err);
 }
 EXPORT_SYMBOL(p9_client_create);
@@ -1214,10 +1230,11 @@ static int p9_client_statsize(struct p9_wstat *wst, int optional)
 {
 	int ret;
 
+	/* NOTE: size shouldn't include its own length */
 	/* size[2] type[2] dev[4] qid[13] */
 	/* mode[4] atime[4] mtime[4] length[8]*/
 	/* name[s] uid[s] gid[s] muid[s] */
-	ret = 2+2+4+13+4+4+4+8+2+2+2+2;
+	ret = 2+4+13+4+4+4+8+2+2+2+2;
 
 	if (wst->name)
 		ret += strlen(wst->name);
@@ -1258,7 +1275,7 @@ int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
 		wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
 		wst->n_uid, wst->n_gid, wst->n_muid);
 
-	req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size, wst);
+	req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
 	if (IS_ERR(req)) {
 		err = PTR_ERR(req);
 		goto error;
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index be1cb909d8c0..31d0b05582a9 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -714,7 +714,7 @@ static int parse_opts(char *params, struct p9_fd_opts *opts)
 	char *p;
 	substring_t args[MAX_OPT_ARGS];
 	int option;
-	char *options;
+	char *options, *tmp_options;
 	int ret;
 
 	opts->port = P9_PORT;
@@ -724,12 +724,13 @@ static int parse_opts(char *params, struct p9_fd_opts *opts)
 	if (!params)
 		return 0;
 
-	options = kstrdup(params, GFP_KERNEL);
-	if (!options) {
+	tmp_options = kstrdup(params, GFP_KERNEL);
+	if (!tmp_options) {
 		P9_DPRINTK(P9_DEBUG_ERROR,
 				"failed to allocate copy of option string\n");
 		return -ENOMEM;
 	}
+	options = tmp_options;
 
 	while ((p = strsep(&options, ",")) != NULL) {
 		int token;
@@ -760,7 +761,8 @@ static int parse_opts(char *params, struct p9_fd_opts *opts)
 			continue;
 		}
 	}
-	kfree(options);
+
+	kfree(tmp_options);
 	return 0;
 }
 
diff --git a/net/9p/trans_rdma.c b/net/9p/trans_rdma.c
index 65cb29db03f8..2c95a89c0f46 100644
--- a/net/9p/trans_rdma.c
+++ b/net/9p/trans_rdma.c
@@ -166,7 +166,7 @@ static int parse_opts(char *params, struct p9_rdma_opts *opts)
 	char *p;
 	substring_t args[MAX_OPT_ARGS];
 	int option;
-	char *options;
+	char *options, *tmp_options;
 	int ret;
 
 	opts->port = P9_PORT;
@@ -177,12 +177,13 @@ static int parse_opts(char *params, struct p9_rdma_opts *opts)
 	if (!params)
 		return 0;
 
-	options = kstrdup(params, GFP_KERNEL);
-	if (!options) {
+	tmp_options = kstrdup(params, GFP_KERNEL);
+	if (!tmp_options) {
 		P9_DPRINTK(P9_DEBUG_ERROR,
 			   "failed to allocate copy of option string\n");
 		return -ENOMEM;
 	}
+	options = tmp_options;
 
 	while ((p = strsep(&options, ",")) != NULL) {
 		int token;
@@ -216,7 +217,7 @@ static int parse_opts(char *params, struct p9_rdma_opts *opts)
 	}
 	/* RQ must be at least as large as the SQ */
 	opts->rq_depth = max(opts->rq_depth, opts->sq_depth);
-	kfree(options);
+	kfree(tmp_options);
 	return 0;
 }
 
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index ea1e3daabefe..cb50f4ae5eef 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -102,7 +102,8 @@ static void p9_virtio_close(struct p9_client *client)
 	struct virtio_chan *chan = client->trans;
 
 	mutex_lock(&virtio_9p_lock);
-	chan->inuse = false;
+	if (chan)
+		chan->inuse = false;
 	mutex_unlock(&virtio_9p_lock);
 }
 
@@ -311,6 +312,7 @@ p9_virtio_create(struct p9_client *client, const char *devname, char *args)
 	}
 
 	client->trans = (void *)chan;
+	client->status = Connected;
 	chan->client = client;
 
 	return 0;