6 files changed, 175 insertions, 3 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 9dd5f1a3d64b..bd78da59a4fd 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -315,6 +315,10 @@ struct smb_version_operations {
         /* send echo request */
         int (*echo)(struct TCP_Server_Info *);
         /* create directory */
+        int (*posix_mkdir)(const unsigned int xid, struct inode *inode,
+                        umode_t mode, struct cifs_tcon *tcon,
+                        const char *full_path,
+                        struct cifs_sb_info *cifs_sb);
         int (*mkdir)(const unsigned int, struct cifs_tcon *, const char *,
                      struct cifs_sb_info *);
         /* set info on created directory */
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index f4697f548a39..a2cfb33e85c1 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1575,6 +1575,17 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
                 goto mkdir_out;
         }
 
+        server = tcon->ses->server;
+
+#ifdef CONFIG_CIFS_SMB311
+        if ((server->ops->posix_mkdir) && (tcon->posix_extensions)) {
+                rc = server->ops->posix_mkdir(xid, inode, mode, tcon, full_path,
+                                              cifs_sb);
+                d_drop(direntry); /* for time being always refresh inode info */
+                goto mkdir_out;
+        }
+#endif /* SMB311 */
+
         if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
                                 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
                 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
@@ -1583,8 +1594,6 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
                         goto mkdir_out;
         }
 
-        server = tcon->ses->server;
-
         if (!server->ops->mkdir) {
                 rc = -ENOSYS;
                 goto mkdir_out;
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index b2390e9a6843..badcfb2f3c22 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3313,6 +3313,7 @@ struct smb_version_operations smb311_operations = {
         .set_compression = smb2_set_compression,
         .mkdir = smb2_mkdir,
         .mkdir_setinfo = smb2_mkdir_setinfo,
+        .posix_mkdir = smb311_posix_mkdir,
         .rmdir = smb2_rmdir,
         .unlink = smb2_unlink,
         .rename = smb2_rename_path,
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 7daf38ab814a..810b85787c91 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1911,6 +1911,159 @@ alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
         return 0;
 }
 
+#ifdef CONFIG_CIFS_SMB311
+int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
+                               umode_t mode, struct cifs_tcon *tcon,
+                               const char *full_path,
+                               struct cifs_sb_info *cifs_sb)
+{
+        struct smb_rqst rqst;
+        struct smb2_create_req *req;
+        struct smb2_create_rsp *rsp;
+        struct TCP_Server_Info *server;
+        struct cifs_ses *ses = tcon->ses;
+        struct kvec iov[3]; /* make sure at least one for each open context */
+        struct kvec rsp_iov = {NULL, 0};
+        int resp_buftype;
+        int uni_path_len;
+        __le16 *copy_path = NULL;
+        int copy_size;
+        int rc = 0;
+        unsigned int n_iov = 2;
+        __u32 file_attributes = 0;
+        char *pc_buf = NULL;
+        int flags = 0;
+        unsigned int total_len;
+        __le16 *path = cifs_convert_path_to_utf16(full_path, cifs_sb);
+
+        if (!path)
+                return -ENOMEM;
+
+        cifs_dbg(FYI, "mkdir\n");
+
+        if (ses && (ses->server))
+                server = ses->server;
+        else
+                return -EIO;
+
+        rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
+
+        if (rc)
+                return rc;
+
+        if (smb3_encryption_required(tcon))
+                flags |= CIFS_TRANSFORM_REQ;
+
+
+        req->ImpersonationLevel = IL_IMPERSONATION;
+        req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
+        /* File attributes ignored on open (used in create though) */
+        req->FileAttributes = cpu_to_le32(file_attributes);
+        req->ShareAccess = FILE_SHARE_ALL_LE;
+        req->CreateDisposition = cpu_to_le32(FILE_CREATE);
+        req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
+
+        iov[0].iov_base = (char *)req;
+        /* -1 since last byte is buf[0] which is sent below (path) */
+        iov[0].iov_len = total_len - 1;
+
+        req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
+
+        /* [MS-SMB2] 2.2.13 NameOffset:
+         * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
+         * the SMB2 header, the file name includes a prefix that will
+         * be processed during DFS name normalization as specified in
+         * section 3.3.5.9. Otherwise, the file name is relative to
+         * the share that is identified by the TreeId in the SMB2
+         * header.
+         */
+        if (tcon->share_flags & SHI1005_FLAGS_DFS) {
+                int name_len;
+
+                req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
+                rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
+                                                 &name_len,
+                                                 tcon->treeName, path);
+                if (rc) {
+                        cifs_small_buf_release(req);
+                        return rc;
+                }
+                req->NameLength = cpu_to_le16(name_len * 2);
+                uni_path_len = copy_size;
+                path = copy_path;
+        } else {
+                uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
+                /* MUST set path len (NameLength) to 0 opening root of share */
+                req->NameLength = cpu_to_le16(uni_path_len - 2);
+                if (uni_path_len % 8 != 0) {
+                        copy_size = roundup(uni_path_len, 8);
+                        copy_path = kzalloc(copy_size, GFP_KERNEL);
+                        if (!copy_path) {
+                                cifs_small_buf_release(req);
+                                return -ENOMEM;
+                        }
+                        memcpy((char *)copy_path, (const char *)path,
+                               uni_path_len);
+                        uni_path_len = copy_size;
+                        path = copy_path;
+                }
+        }
+
+        iov[1].iov_len = uni_path_len;
+        iov[1].iov_base = path;
+        req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
+
+        if (tcon->posix_extensions) {
+                if (n_iov > 2) {
+                        struct create_context *ccontext =
+                            (struct create_context *)iov[n_iov-1].iov_base;
+                        ccontext->Next =
+                                cpu_to_le32(iov[n_iov-1].iov_len);
+                }
+
+                rc = add_posix_context(iov, &n_iov, mode);
+                if (rc) {
+                        cifs_small_buf_release(req);
+                        kfree(copy_path);
+                        return rc;
+                }
+                pc_buf = iov[n_iov-1].iov_base;
+        }
+
+
+        memset(&rqst, 0, sizeof(struct smb_rqst));
+        rqst.rq_iov = iov;
+        rqst.rq_nvec = n_iov;
+
+        rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
+                            &rsp_iov);
+
+        cifs_small_buf_release(req);
+        rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
+
+        if (rc != 0) {
+                cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
+                trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
+                                    CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES, rc);
+                goto smb311_mkdir_exit;
+        } else
+                trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
+                                     ses->Suid, CREATE_NOT_FILE,
+                                     FILE_WRITE_ATTRIBUTES);
+
+        SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
+