add OpenHarmony 1.0 baseline

fs/vfs/operation/fs_writev.c

@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 2013-2019, Huawei Technologies Co., Ltd. All rights reserved.
+ * Copyright (c) 2020, Huawei Device Co., Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ *    conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *    of conditions and the following disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors may be used
+ *    to endorse or promote products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "sys/types.h"
+#include "sys/uio.h"
+#include "unistd.h"
+#include "string.h"
+#include "stdlib.h"
+#include "fs/fs.h"
+#include "inode/inode.h"
+#include "user_copy.h"
+
+static int iov_trans_to_buf(char *buf, ssize_t totallen, const struct iovec *iov, int iovcnt)
+{
+    int i;
+    size_t ret, writepart;
+    size_t bytestowrite;
+    char *writebuf = NULL;
+    char *curbuf = buf;
+
+    for (i = 0; i < iovcnt; ++i) {
+        writebuf = (char *)iov[i].iov_base;
+        bytestowrite = iov[i].iov_len;
+        if (bytestowrite == 0) {
+            continue;
+        }
+
+        if (totallen == 0) {
+            break;
+        }
+
+        bytestowrite = (totallen < bytestowrite) ? totallen : bytestowrite;
+        ret = LOS_CopyToKernel(curbuf, bytestowrite, writebuf, bytestowrite);
+        if (ret != 0) {
+            if (ret == bytestowrite) {
+                set_errno(EFAULT);
+                return VFS_ERROR;
+            } else {
+                writepart = bytestowrite - ret;
+                curbuf += writepart;
+                totallen -= writepart;
+                break;
+            }
+        }
+        curbuf += bytestowrite;
+        totallen -= bytestowrite;
+    }
+
+    return (int)((intptr_t)curbuf - (intptr_t)buf);
+}
+
+ssize_t vfs_writev(int fd, const struct iovec *iov, int iovcnt, off_t *offset)
+{
+    int i, ret;
+    char *buf = NULL;
+    size_t buflen = 0;
+    size_t bytestowrite;
+    ssize_t totalbyteswritten;
+    size_t totallen;
+
+    if ((iov == NULL) || (iovcnt > IOV_MAX)) {
+        return VFS_ERROR;
+    }
+
+    for (i = 0; i < iovcnt; ++i) {
+        if (SSIZE_MAX - buflen < iov[i].iov_len) {
+            set_errno(EINVAL);
+            return VFS_ERROR;
+        }
+        buflen += iov[i].iov_len;
+    }
+
+    if (buflen == 0) {
+        return 0;
+    }
+
+    totallen = buflen * sizeof(char);
+    buf = (char *)LOS_VMalloc(totallen);
+    if (buf == NULL) {
+        return VFS_ERROR;
+    }
+
+    ret = iov_trans_to_buf(buf, totallen, iov, iovcnt);
+    if (ret <= 0) {
+        LOS_VFree(buf);
+        return VFS_ERROR;
+    }
+
+    bytestowrite = (ssize_t)ret;
+    totalbyteswritten = (offset == NULL) ? write(fd, buf, bytestowrite)
+                                         : pwrite(fd, buf, bytestowrite, *offset);
+    LOS_VFree(buf);
+    return totalbyteswritten;
+}
+
+ssize_t writev(int fd, const struct iovec *iov, int iovcnt)
+{
+    return vfs_writev(fd, iov, iovcnt, NULL);
+}