Merge v7.1.5linux-rolling-stable

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

12 files changed, 153 insertions, 86 deletions

diff --git a/fs/smb/client/cifs_fs_sb.h b/fs/smb/client/cifs_fs_sb.h
index 84e7e366b0ff..d6494e1d93cc 100644
--- a/fs/smb/client/cifs_fs_sb.h
+++ b/fs/smb/client/cifs_fs_sb.h
@@ -56,6 +56,7 @@ struct cifs_sb_info {
 	struct smb3_fs_context *ctx;
 	atomic_t active;
 	atomic_t mnt_cifs_flags;
+	atomic_t outstanding_rreq;	/* nr of rreqs not yet fully deinitialized */
 	struct delayed_work prune_tlinks;
 	struct rcu_head rcu;
 
diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c
index ce23924f01b3..d6c30f8552e0 100644
--- a/fs/smb/client/cifsfs.c
+++ b/fs/smb/client/cifsfs.c
@@ -309,6 +309,18 @@ static void cifs_kill_sb(struct super_block *sb)
 		/* Wait for all opened files to release */
 		flush_workqueue(deferredclose_wq);
 
+		/*
+		 * Wait for all in-flight netfs I/O requests to finish their
+		 * cleanup_work so that any cifsFileInfo final puts they queue
+		 * to fileinfo_put_wq/serverclose_wq have been queued, then
+		 * drain the workqueue so the cfile dentry refs are dropped to
+		 * avoid the busy dentry warning.
+		 */
+		wait_var_event(&cifs_sb->outstanding_rreq,
+			       !atomic_read(&cifs_sb->outstanding_rreq));
+		flush_workqueue(serverclose_wq);
+		flush_workqueue(fileinfo_put_wq);
+
 		/* finally release root dentry */
 		dput(cifs_sb->root);
 		cifs_sb->root = NULL;
diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c
index dcde25da468d..9511deef7084 100644
--- a/fs/smb/client/connect.c
+++ b/fs/smb/client/connect.c
@@ -3479,6 +3479,7 @@ int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb)
 
 	spin_lock_init(&cifs_sb->tlink_tree_lock);
 	cifs_sb->tlink_tree = RB_ROOT;
+	atomic_set(&cifs_sb->outstanding_rreq, 0);
 
 	cifs_dbg(FYI, "file mode: %04ho  dir mode: %04ho\n",
 		 ctx->file_mode, ctx->dir_mode);
@@ -3996,6 +3997,9 @@ cifs_umount(struct cifs_sb_info *cifs_sb)
 	}
 	spin_unlock(&cifs_sb->tlink_tree_lock);
 
+	flush_workqueue(serverclose_wq);
+	flush_workqueue(fileinfo_put_wq);
+
 	kfree(cifs_sb->prepath);
 	call_rcu(&cifs_sb->rcu, delayed_free);
 }
diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c
index e536e424b9b7..a26a464d6242 100644
--- a/fs/smb/client/file.c
+++ b/fs/smb/client/file.c
@@ -241,6 +241,7 @@ static void cifs_issue_read(struct netfs_io_subrequest *subreq)
 	return;
 
 failed:
+	add_credits_and_wake_if(rdata->server, &rdata->credits, 0);
 	subreq->error = rc;
 	netfs_read_subreq_terminated(subreq);
 }
@@ -287,6 +288,7 @@ static int cifs_init_request(struct netfs_io_request *rreq, struct file *file)
 		return smb_EIO1(smb_eio_trace_not_netfs_writeback, rreq->origin);
 	}
 
+	atomic_inc(&cifs_sb->outstanding_rreq);
 	return 0;
 }
 
@@ -308,9 +310,13 @@ static void cifs_rreq_done(struct netfs_io_request *rreq)
 static void cifs_free_request(struct netfs_io_request *rreq)
 {
 	struct cifs_io_request *req = container_of(rreq, struct cifs_io_request, rreq);
+	struct cifs_sb_info *cifs_sb = CIFS_SB(rreq->inode->i_sb);
 
 	if (req->cfile)
 		cifsFileInfo_put(req->cfile);
+
+	if (atomic_dec_and_test(&cifs_sb->outstanding_rreq))
+		wake_up_var(&cifs_sb->outstanding_rreq);
 }
 
 static void cifs_free_subrequest(struct netfs_io_subrequest *subreq)
diff --git a/fs/smb/client/fs_context.c b/fs/smb/client/fs_context.c
index 2f86158f85d7..fd4b13cd654d 100644
--- a/fs/smb/client/fs_context.c
+++ b/fs/smb/client/fs_context.c
@@ -693,6 +693,41 @@ static int smb3_handle_conflicting_options(struct fs_context *fc)
 {
 	struct smb3_fs_context *ctx = smb3_fc2context(fc);
 
+	if (ctx->rdma && ctx->vals->protocol_id < SMB30_PROT_ID) {
+		cifs_errorf(fc, "SMB Direct requires Version >=3.0\n");
+		return -EOPNOTSUPP;
+	}
+
+	if (ctx->multiuser && !IS_ENABLED(CONFIG_KEYS)) {
+		cifs_errorf(fc, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
+		return -EOPNOTSUPP;
+	}
+
+	if (ctx->multiuser && ctx->upcall_target == UPTARGET_MOUNT) {
+		cifs_errorf(fc, "multiuser mount option not supported with upcalltarget set as 'mount'\n");
+		return -EINVAL;
+	}
+
+	if (ctx->uid_specified && !ctx->forceuid_specified) {
+		ctx->override_uid = 1;
+		pr_notice("enabling forceuid mount option implicitly because uid= option is specified\n");
+	}
+
+	if (ctx->gid_specified && !ctx->forcegid_specified) {
+		ctx->override_gid = 1;
+		pr_notice("enabling forcegid mount option implicitly because gid= option is specified\n");
+	}
+
+	if (ctx->override_uid && !ctx->uid_specified) {
+		ctx->override_uid = 0;
+		pr_notice("ignoring forceuid mount option specified with no uid= option\n");
+	}
+
+	if (ctx->override_gid && !ctx->gid_specified) {
+		ctx->override_gid = 0;
+		pr_notice("ignoring forcegid mount option specified with no gid= option\n");
+	}
+
 	if (ctx->multichannel_specified) {
 		if (ctx->multichannel) {
 			if (!ctx->max_channels_specified) {
@@ -711,19 +746,14 @@ static int smb3_handle_conflicting_options(struct fs_context *fc)
 				return -EINVAL;
 			}
 		}
-	} else {
-		if (ctx->max_channels_specified) {
-			if (ctx->max_channels > 1)
-				ctx->multichannel = true;
-			else
-				ctx->multichannel = false;
-		} else {
+	} else if (ctx->max_channels_specified) {
+		if (ctx->max_channels > 1)
+			ctx->multichannel = true;
+		else
 			ctx->multichannel = false;
-			ctx->max_channels = 1;
-		}
 	}
 
-	//resetting default values as remount doesn't initialize fs_context again
+	/* clear parse-time latches so they don't persist across remounts */
 	ctx->multichannel_specified = false;
 	ctx->max_channels_specified = false;
 
@@ -804,28 +834,23 @@ static int smb3_fs_context_parse_monolithic(struct fs_context *fc,
 		if (ret < 0)
 			break;
 	}
-	return ret ?: smb3_handle_conflicting_options(fc);
+	return ret;
 }
 
 /*
- * Validate the preparsed information in the config.
+ * smb3_fs_context_validate - check initial-mount-only constraints:
+ * UNC presence, address resolution, dialect warnings
+ *
+ * @fc: generic mount context
  */
 static int smb3_fs_context_validate(struct fs_context *fc)
 {
 	struct smb3_fs_context *ctx = smb3_fc2context(fc);
+	int rc;
 
-	if (ctx->rdma && ctx->vals->protocol_id < SMB30_PROT_ID) {
-		cifs_errorf(fc, "SMB Direct requires Version >=3.0\n");
-		return -EOPNOTSUPP;
-	}
-
-#ifndef CONFIG_KEYS
-	/* Muliuser mounts require CONFIG_KEYS support */
-	if (ctx->multiuser) {
-		cifs_errorf(fc, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
-		return -1;
-	}
-#endif
+	rc = smb3_handle_conflicting_options(fc);
+	if (rc)
+		return rc;
 
 	if (ctx->got_version == false)
 		pr_warn_once("No dialect specified on mount. Default has changed to a more secure dialect, SMB2.1 or later (e.g. SMB3.1.1), from CIFS (SMB1). To use the less secure SMB1 dialect to access old servers which do not support SMB3.1.1 (or even SMB3 or SMB2.1) specify vers=1.0 on mount.\n");
@@ -860,26 +885,6 @@ static int smb3_fs_context_validate(struct fs_context *fc)
 	/* set the port that we got earlier */
 	cifs_set_port((struct sockaddr *)&ctx->dstaddr, ctx->port);
 
-	if (ctx->uid_specified && !ctx->forceuid_specified) {
-		ctx->override_uid = 1;
-		pr_notice("enabling forceuid mount option implicitly because uid= option is specified\n");
-	}
-
-	if (ctx->gid_specified && !ctx->forcegid_specified) {
-		ctx->override_gid = 1;
-		pr_notice("enabling forcegid mount option implicitly because gid= option is specified\n");
-	}
-
-	if (ctx->override_uid && !ctx->uid_specified) {
-		ctx->override_uid = 0;
-		pr_notice("ignoring forceuid mount option specified with no uid= option\n");
-	}
-
-	if (ctx->override_gid && !ctx->gid_specified) {
-		ctx->override_gid = 0;
-		pr_notice("ignoring forcegid mount option specified with no gid= option\n");
-	}
-
 	return 0;
 }
 
@@ -1078,6 +1083,10 @@ static int smb3_reconfigure(struct fs_context *fc)
 	if (rc)
 		return rc;
 
+	rc = smb3_handle_conflicting_options(fc);
+	if (rc)
+		return rc;
+
 	old_ctx = kzalloc_obj(*old_ctx);
 	if (!old_ctx)
 		return -ENOMEM;
@@ -1933,11 +1942,6 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
 	}
 	/* case Opt_ignore: - is ignored as expected ... */
 
-	if (ctx->multiuser && ctx->upcall_target == UPTARGET_MOUNT) {
-		cifs_errorf(fc, "multiuser mount option not supported with upcalltarget set as 'mount'\n");
-		goto cifs_parse_mount_err;
-	}
-
 	return 0;
 
  cifs_parse_mount_err:
diff --git a/fs/smb/client/inode.c b/fs/smb/client/inode.c
index 3b5bac93812d..826d36ed13ec 100644
--- a/fs/smb/client/inode.c
+++ b/fs/smb/client/inode.c
@@ -28,6 +28,23 @@
 #include "cached_dir.h"
 #include "reparse.h"
 
+static void cifs_invalidate_cached_dir(struct cifs_tcon *tcon,
+				       struct dentry *parent)
+{
+	struct cached_fid *parent_cfid = NULL;
+
+	if (!tcon || !parent)
+		return;
+
+	if (!open_cached_dir_by_dentry(tcon, parent, &parent_cfid)) {
+		mutex_lock(&parent_cfid->dirents.de_mutex);
+		parent_cfid->dirents.is_valid = false;
+		parent_cfid->dirents.is_failed = true;
+		mutex_unlock(&parent_cfid->dirents.de_mutex);
+		close_cached_dir(parent_cfid);
+	}
+}
+
 /*
  * Set parameters for the netfs library
  */
@@ -2067,6 +2084,9 @@ psx_del_no_retry:
 		cifs_set_file_info(inode, attrs, xid, full_path, origattr);
 
 out_reval:
+	if (!rc && dentry->d_parent)
+		cifs_invalidate_cached_dir(tcon, dentry->d_parent);
+
 	if (inode) {
 		cifs_inode = CIFS_I(inode);
 		cifs_inode->time = 0;	/* will force revalidate to get info
@@ -2378,7 +2398,6 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 	}
 
 	rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
-	cifs_put_tlink(tlink);
 
 	cifsInode = CIFS_I(d_inode(direntry));
 
@@ -2388,6 +2407,8 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 		i_size_write(d_inode(direntry), 0);
 		clear_nlink(d_inode(direntry));
 		spin_unlock(&d_inode(direntry)->i_lock);
+		if (direntry->d_parent)
+			cifs_invalidate_cached_dir(tcon, direntry->d_parent);
 	}
 
 	/* force revalidate to go get info when needed */
@@ -2402,6 +2423,7 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 
 	inode_set_ctime_current(d_inode(direntry));
 	inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
+	cifs_put_tlink(tlink);
 
 rmdir_exit:
 	free_dentry_path(page);
@@ -2668,6 +2690,12 @@ unlink_target:
 	}
 
 	/* force revalidate to go get info when needed */
+	if (!rc) {
+		cifs_invalidate_cached_dir(tcon, source_dentry->d_parent);
+		if (target_dentry->d_parent != source_dentry->d_parent)
+			cifs_invalidate_cached_dir(tcon, target_dentry->d_parent);
+	}
+
 	CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0;
 
 cifs_rename_exit:
diff --git a/fs/smb/client/ioctl.c b/fs/smb/client/ioctl.c
index 17408bb8ab65..746d70091f3d 100644
--- a/fs/smb/client/ioctl.c
+++ b/fs/smb/client/ioctl.c
@@ -392,13 +392,11 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 			}
 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
 #endif /* CONFIG_CIFS_POSIX */
-			rc = 0;
-			if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
-				/* add in the compressed bit */
-				ExtAttrBits = FS_COMPR_FL;
-				rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
-					      (int __user *)arg);
-			}
+			if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_COMPRESSED)
+				ExtAttrBits |= FS_COMPR_FL;
+
+			rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
+				      (int __user *)arg);
 			break;
 		case FS_IOC_SETFLAGS:
 			if (pSMBFile == NULL)
diff --git a/fs/smb/client/misc.c b/fs/smb/client/misc.c
index 0c54b9b79a2c..ee1728eec8aa 100644
--- a/fs/smb/client/misc.c
+++ b/fs/smb/client/misc.c
@@ -752,6 +752,10 @@ parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size,
 		node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags);
 
 		/* copy DfsPath */
+		if (le16_to_cpu(ref->DfsPathOffset) > data_end - (char *)ref) {
+			rc = -EINVAL;
+			goto parse_DFS_referrals_exit;
+		}
 		temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset);
 		max_len = data_end - temp;
 		node->path_name = cifs_strndup_from_utf16(temp, max_len,
@@ -762,6 +766,10 @@ parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size,
 		}
 
 		/* copy link target UNC */
+		if (le16_to_cpu(ref->NetworkAddressOffset) > data_end - (char *)ref) {
+			rc = -EINVAL;
+			goto parse_DFS_referrals_exit;
+		}
 		temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset);
 		max_len = data_end - temp;
 		node->node_name = cifs_strndup_from_utf16(temp, max_len,
diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c
index cd1e1eaee67a..5cc5b0410d48 100644
--- a/fs/smb/client/reparse.c
+++ b/fs/smb/client/reparse.c
@@ -67,6 +67,7 @@ static int create_native_symlink(const unsigned int xid, struct inode *inode,
 	char *sym = NULL;
 	struct kvec iov;
 	bool directory;
+	int path_len;
 	int rc = 0;
 
 	if (strlen(symname) > REPARSE_SYM_PATH_MAX)
@@ -168,7 +169,21 @@ static int create_native_symlink(const unsigned int xid, struct inode *inode,
 	if (!(sbflags & CIFS_MOUNT_POSIX_PATHS) && symname[0] == '/')
 		sym[0] = sym[1] = sym[2] = sym[5] = '_';
 
-	path = cifs_convert_path_to_utf16(sym, cifs_sb);
+	/*
+	 * On a POSIX paths mount the symlink target is stored verbatim, so
+	 * convert it with cifs_strndup_to_utf16().  cifs_convert_path_to_utf16()
+	 * must not be used here: it strips a leading path separator (it is
+	 * meant for share-relative SMB paths), which would corrupt an absolute
+	 * POSIX symlink target such as "/foo/bar".  Using NO_MAP_UNI_RSVD also
+	 * matches the readback path in smb2_parse_native_symlink().
+	 */
+	if (sbflags & CIFS_MOUNT_POSIX_PATHS)
+		path = cifs_strndup_to_utf16(sym, strlen(sym), &path_len,
+					     cifs_sb->local_nls,
+					     NO_MAP_UNI_RSVD);
+	else
+		path = cifs_convert_path_to_utf16(sym, cifs_sb);
+
 	if (!path) {
 		rc = -ENOMEM;
 		goto out;
diff --git a/fs/smb/client/smb1pdu.h b/fs/smb/client/smb1pdu.h
index 7584e94d9b2b..0870949144ab 100644
--- a/fs/smb/client/smb1pdu.h
+++ b/fs/smb/client/smb1pdu.h
@@ -1211,11 +1211,6 @@ typedef struct smb_com_transaction_compr_ioctl_req {
 	__le16 compression_state;  /* See below for valid flags */
 } __packed TRANSACT_COMPR_IOCTL_REQ;
 
-/* compression state flags */
-#define COMPRESSION_FORMAT_NONE		0x0000
-#define COMPRESSION_FORMAT_DEFAULT	0x0001
-#define COMPRESSION_FORMAT_LZNT1	0x0002
-
 typedef struct smb_com_transaction_ioctl_rsp {
 	struct smb_hdr hdr;	/* wct = 19 */
 	__u8 Reserved[3];
diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index ce34b3fbfca3..02c2f83353e2 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -1772,8 +1772,8 @@ replay_again:
 		if (le32_to_cpu(io_rsp->OutputCount) < qi.input_buffer_length)
 			qi.input_buffer_length = le32_to_cpu(io_rsp->OutputCount);
 		if (qi.input_buffer_length > 0 &&
-		    le32_to_cpu(io_rsp->OutputOffset) + qi.input_buffer_length
-		    > rsp_iov[1].iov_len) {
+		     size_add(le32_to_cpu(io_rsp->OutputOffset),
+			     qi.input_buffer_length) > rsp_iov[1].iov_len) {
 			rc = -EFAULT;
 			goto out;
 		}
@@ -2117,8 +2117,9 @@ smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
 }
 
 /* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
-static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
-		struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
+static int smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
+			   struct cifsFileInfo *cfile, struct inode *inode,
+			   __u8 setsparse)
 {
 	struct cifsInodeInfo *cifsi;
 	int rc;
@@ -2127,31 +2128,31 @@ static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
 
 	/* if file already sparse don't bother setting sparse again */
 	if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
-		return true; /* already sparse */
+		return 0; /* already sparse */
 
 	if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
-		return true; /* already not sparse */
+		return 0; /* already not sparse */
 
 	/*
 	 * Can't check for sparse support on share the usual way via the
 	 * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
 	 * since Samba server doesn't set the flag on the share, yet
 	 * supports the set sparse FSCTL and returns sparse correctly
-	 * in the file attributes. If we fail setting sparse though we
-	 * mark that server does not support sparse files for this share
-	 * to avoid repeatedly sending the unsupported fsctl to server
-	 * if the file is repeatedly extended.
+	 * in the file attributes. If the server returns EOPNOTSUPP, mark
+	 * that sparse files are not supported on this share to avoid
+	 * repeatedly sending the unsupported FSCTL.
 	 */
 	if (tcon->broken_sparse_sup)
-		return false;
+		return -EOPNOTSUPP;
 
 	rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
 			cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
 			&setsparse, 1, CIFSMaxBufSize, NULL, NULL);
 	if (rc) {
-		tcon->broken_sparse_sup = true;
+		if (rc == -EOPNOTSUPP)
+			tcon->broken_sparse_sup = true;
 		cifs_dbg(FYI, "set sparse rc = %d\n", rc);
-		return false;
+		return rc;
 	}
 
 	if (setsparse)
@@ -2159,7 +2160,7 @@ static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
 	else
 		cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
 
-	return true;
+	return 0;
 }
 
 static int
@@ -3483,10 +3484,9 @@ static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
 
 	/* Need to make file sparse, if not already, before freeing range. */
 	/* Consider adding equivalent for compressed since it could also work */
-	if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse)) {
-		rc = -EOPNOTSUPP;
+	rc = smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
+	if (rc)
 		goto out;
-	}
 
 	filemap_invalidate_lock(inode->i_mapping);
 	/*
@@ -3595,7 +3595,7 @@ static int smb3_simple_fallocate_range(unsigned int xid,
 	if (rc)
 		goto out;
 
-	buf = kzalloc(1024 * 1024, GFP_KERNEL);
+	buf = kvzalloc(1024 * 1024, GFP_KERNEL);
 	if (buf == NULL) {
 		rc = -ENOMEM;
 		goto out;
@@ -3652,7 +3652,7 @@ static int smb3_simple_fallocate_range(unsigned int xid,
 
  out:
 	kfree(out_data);
-	kfree(buf);
+	kvfree(buf);
 	return rc;
 }
 
diff --git a/fs/smb/client/smb2pdu.h b/fs/smb/client/smb2pdu.h
index 30d70097fe2f..b9bf2fa989d5 100644
--- a/fs/smb/client/smb2pdu.h
+++ b/fs/smb/client/smb2pdu.h
@@ -195,10 +195,6 @@ struct network_resiliency_req {
 
 #define NO_FILE_ID 0xFFFFFFFFFFFFFFFFULL /* general ioctls to srv not to file */
 
-struct compress_ioctl {
-	__le16 CompressionState; /* See cifspdu.h for possible flag values */
-} __packed;
-
 /*
  * Maximum number of iovs we need for an ioctl request.
  * [0] : struct smb2_ioctl_req