diff --git a/updater/Android.bp b/updater/Android.bp
index c77bac8..c95ec5e 100644
--- a/updater/Android.bp
+++ b/updater/Android.bp
@@ -24,7 +24,6 @@
         "libbootloader_message",
         "libbspatch",
         "libedify",
-        "libotafault",
         "libotautil",
         "libext4_utils",
         "libfec",
diff --git a/updater/Android.mk b/updater/Android.mk
index 5478a7d..78e32ba 100644
--- a/updater/Android.mk
+++ b/updater/Android.mk
@@ -27,7 +27,6 @@
     libbootloader_message \
     libbspatch \
     libedify \
-    libotafault \
     libotautil \
     libext4_utils \
     libfec \
diff --git a/updater/blockimg.cpp b/updater/blockimg.cpp
index 96b2d9f..823a1cb 100644
--- a/updater/blockimg.cpp
+++ b/updater/blockimg.cpp
@@ -53,7 +53,6 @@
 #include <ziparchive/zip_archive.h>
 
 #include "edify/expr.h"
-#include "otafault/ota_io.h"
 #include "otautil/error_code.h"
 #include "otautil/paths.h"
 #include "otautil/print_sha1.h"
@@ -119,15 +118,14 @@
 }
 
 static bool FsyncDir(const std::string& dirname) {
-  android::base::unique_fd dfd(
-      TEMP_FAILURE_RETRY(ota_open(dirname.c_str(), O_RDONLY | O_DIRECTORY)));
+  android::base::unique_fd dfd(TEMP_FAILURE_RETRY(open(dirname.c_str(), O_RDONLY | O_DIRECTORY)));
   if (dfd == -1) {
-    failure_type = kFileOpenFailure;
+    failure_type = errno == EIO ? kEioFailure : kFileOpenFailure;
     PLOG(ERROR) << "Failed to open " << dirname;
     return false;
   }
   if (fsync(dfd) == -1) {
-    failure_type = kFsyncFailure;
+    failure_type = errno == EIO ? kEioFailure : kFsyncFailure;
     PLOG(ERROR) << "Failed to fsync " << dirname;
     return false;
   }
@@ -180,47 +178,6 @@
   return true;
 }
 
-static int read_all(int fd, uint8_t* data, size_t size) {
-    size_t so_far = 0;
-    while (so_far < size) {
-        ssize_t r = TEMP_FAILURE_RETRY(ota_read(fd, data+so_far, size-so_far));
-        if (r == -1) {
-            failure_type = kFreadFailure;
-            PLOG(ERROR) << "read failed";
-            return -1;
-        } else if (r == 0) {
-            failure_type = kFreadFailure;
-            LOG(ERROR) << "read reached unexpected EOF.";
-            return -1;
-        }
-        so_far += r;
-    }
-    return 0;
-}
-
-static int read_all(int fd, std::vector<uint8_t>* buffer, size_t size) {
-  return read_all(fd, buffer->data(), size);
-}
-
-static int write_all(int fd, const uint8_t* data, size_t size) {
-    size_t written = 0;
-    while (written < size) {
-        ssize_t w = TEMP_FAILURE_RETRY(ota_write(fd, data+written, size-written));
-        if (w == -1) {
-            failure_type = kFwriteFailure;
-            PLOG(ERROR) << "write failed";
-            return -1;
-        }
-        written += w;
-    }
-
-    return 0;
-}
-
-static int write_all(int fd, const std::vector<uint8_t>& buffer, size_t size) {
-    return write_all(fd, buffer.data(), size);
-}
-
 static bool discard_blocks(int fd, off64_t offset, uint64_t size) {
   // Don't discard blocks unless the update is a retry run.
   if (!is_retry) {
@@ -293,7 +250,9 @@
         write_now = current_range_left_;
       }
 
-      if (write_all(fd_, data, write_now) == -1) {
+      if (!android::base::WriteFully(fd_, data, write_now)) {
+        failure_type = errno == EIO ? kEioFailure : kFwriteFailure;
+        PLOG(ERROR) << "Failed to write " << write_now << " bytes of data";
         break;
       }
 
@@ -510,7 +469,9 @@
     }
 
     size_t size = (range.second - range.first) * BLOCKSIZE;
-    if (read_all(fd, buffer->data() + p, size) == -1) {
+    if (!android::base::ReadFully(fd, buffer->data() + p, size)) {
+      failure_type = errno == EIO ? kEioFailure : kFreadFailure;
+      PLOG(ERROR) << "Failed to read " << size << " bytes of data";
       return -1;
     }
 
@@ -533,7 +494,9 @@
       return -1;
     }
 
-    if (write_all(fd, buffer.data() + written, size) == -1) {
+    if (!android::base::WriteFully(fd, buffer.data() + written, size)) {
+      failure_type = errno == EIO ? kEioFailure : kFwriteFailure;
+      PLOG(ERROR) << "Failed to write " << size << " bytes of data";
       return -1;
     }
 
@@ -793,15 +756,18 @@
     return -1;
   }
 
-  android::base::unique_fd fd(TEMP_FAILURE_RETRY(ota_open(fn.c_str(), O_RDONLY)));
+  android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(fn.c_str(), O_RDONLY)));
   if (fd == -1) {
+    failure_type = errno == EIO ? kEioFailure : kFileOpenFailure;
     PLOG(ERROR) << "open \"" << fn << "\" failed";
     return -1;
   }
 
   allocate(sb.st_size, buffer);
 
-  if (read_all(fd, buffer, sb.st_size) == -1) {
+  if (!android::base::ReadFully(fd, buffer->data(), sb.st_size)) {
+    failure_type = errno == EIO ? kEioFailure : kFreadFailure;
+    PLOG(ERROR) << "Failed to read " << sb.st_size << " bytes of data";
     return -1;
   }
 
@@ -855,8 +821,9 @@
   LOG(INFO) << " writing " << blocks << " blocks to " << cn;
 
   android::base::unique_fd fd(
-      TEMP_FAILURE_RETRY(ota_open(fn.c_str(), O_WRONLY | O_CREAT | O_TRUNC, STASH_FILE_MODE)));
+      TEMP_FAILURE_RETRY(open(fn.c_str(), O_WRONLY | O_CREAT | O_TRUNC, STASH_FILE_MODE)));
   if (fd == -1) {
+    failure_type = errno == EIO ? kEioFailure : kFileOpenFailure;
     PLOG(ERROR) << "failed to create \"" << fn << "\"";
     return -1;
   }
@@ -866,12 +833,14 @@
     return -1;
   }
 
-  if (write_all(fd, buffer, blocks * BLOCKSIZE) == -1) {
+  if (!android::base::WriteFully(fd, buffer.data(), blocks * BLOCKSIZE)) {
+    failure_type = errno == EIO ? kEioFailure : kFwriteFailure;
+    PLOG(ERROR) << "Failed to write " << blocks * BLOCKSIZE << " bytes of data";
     return -1;
   }
 
-  if (ota_fsync(fd) == -1) {
-    failure_type = kFsyncFailure;
+  if (fsync(fd) == -1) {
+    failure_type = errno == EIO ? kEioFailure : kFsyncFailure;
     PLOG(ERROR) << "fsync \"" << fn << "\" failed";
     return -1;
   }
@@ -883,7 +852,6 @@
 
   std::string dname = GetStashFileName(base, "", "");
   if (!FsyncDir(dname)) {
-    failure_type = kFsyncFailure;
     return -1;
   }
 
@@ -1313,7 +1281,9 @@
       }
 
       for (size_t j = range.first; j < range.second; ++j) {
-        if (write_all(params.fd, params.buffer, BLOCKSIZE) == -1) {
+        if (!android::base::WriteFully(params.fd, params.buffer.data(), BLOCKSIZE)) {
+          failure_type = errno == EIO ? kEioFailure : kFwriteFailure;
+          PLOG(ERROR) << "Failed to write " << BLOCKSIZE << " bytes of data";
           return -1;
         }
       }
@@ -1560,7 +1530,8 @@
     }
 
     for (size_t i = range.first; i < range.second; i++) {
-      if (read_all(params.fd, buffer, BLOCKSIZE) == -1) {
+      if (!android::base::ReadFully(params.fd, buffer, BLOCKSIZE)) {
+        failure_type = errno == EIO ? kEioFailure : kFreadFailure;
         LOG(ERROR) << "Failed to read data in " << range.first << ":" << range.second;
         return -1;
       }
@@ -1676,8 +1647,9 @@
     return StringValue("");
   }
 
-  params.fd.reset(TEMP_FAILURE_RETRY(ota_open(blockdev_filename->data.c_str(), O_RDWR)));
+  params.fd.reset(TEMP_FAILURE_RETRY(open(blockdev_filename->data.c_str(), O_RDWR)));
   if (params.fd == -1) {
+    failure_type = errno == EIO ? kEioFailure : kFileOpenFailure;
     PLOG(ERROR) << "open \"" << blockdev_filename->data << "\" failed";
     return StringValue("");
   }
@@ -1859,8 +1831,8 @@
     }
 
     if (params.canwrite) {
-      if (ota_fsync(params.fd) == -1) {
-        failure_type = kFsyncFailure;
+      if (fsync(params.fd) == -1) {
+        failure_type = errno == EIO ? kEioFailure : kFsyncFailure;
         PLOG(ERROR) << "fsync failed";
         goto pbiudone;
       }
@@ -1920,8 +1892,8 @@
     LOG(INFO) << "verified partition contents; update may be resumed";
   }
 
-  if (ota_fsync(params.fd) == -1) {
-    failure_type = kFsyncFailure;
+  if (fsync(params.fd) == -1) {
+    failure_type = errno == EIO ? kEioFailure : kFsyncFailure;
     PLOG(ERROR) << "fsync failed";
   }
   // params.fd will be automatically closed because it's a unique_fd.
@@ -2059,9 +2031,10 @@
     return StringValue("");
   }
 
-  android::base::unique_fd fd(ota_open(blockdev_filename->data.c_str(), O_RDWR));
+  android::base::unique_fd fd(open(blockdev_filename->data.c_str(), O_RDWR));
   if (fd == -1) {
-    ErrorAbort(state, kFileOpenFailure, "open \"%s\" failed: %s", blockdev_filename->data.c_str(),
+    CauseCode cause_code = errno == EIO ? kEioFailure : kFileOpenFailure;
+    ErrorAbort(state, cause_code, "open \"%s\" failed: %s", blockdev_filename->data.c_str(),
                strerror(errno));
     return StringValue("");
   }
@@ -2081,8 +2054,9 @@
     }
 
     for (size_t j = range.first; j < range.second; ++j) {
-      if (read_all(fd, &buffer, BLOCKSIZE) == -1) {
-        ErrorAbort(state, kFreadFailure, "failed to read %s: %s", blockdev_filename->data.c_str(),
+      if (!android::base::ReadFully(fd, buffer.data(), BLOCKSIZE)) {
+        CauseCode cause_code = errno == EIO ? kEioFailure : kFreadFailure;
+        ErrorAbort(state, cause_code, "failed to read %s: %s", blockdev_filename->data.c_str(),
                    strerror(errno));
         return StringValue("");
       }
@@ -2121,9 +2095,10 @@
     return StringValue("");
   }
 
-  android::base::unique_fd fd(ota_open(arg_filename->data.c_str(), O_RDONLY));
+  android::base::unique_fd fd(open(arg_filename->data.c_str(), O_RDONLY));
   if (fd == -1) {
-    ErrorAbort(state, kFileOpenFailure, "open \"%s\" failed: %s", arg_filename->data.c_str(),
+    CauseCode cause_code = errno == EIO ? kEioFailure : kFileOpenFailure;
+    ErrorAbort(state, cause_code, "open \"%s\" failed: %s", arg_filename->data.c_str(),
                strerror(errno));
     return StringValue("");
   }
@@ -2132,7 +2107,8 @@
   std::vector<uint8_t> block0_buffer(BLOCKSIZE);
 
   if (ReadBlocks(blk0, &block0_buffer, fd) == -1) {
-    ErrorAbort(state, kFreadFailure, "failed to read %s: %s", arg_filename->data.c_str(),
+    CauseCode cause_code = errno == EIO ? kEioFailure : kFreadFailure;
+    ErrorAbort(state, cause_code, "failed to read %s: %s", arg_filename->data.c_str(),
                strerror(errno));
     return StringValue("");
   }
diff --git a/updater/install.cpp b/updater/install.cpp
index f933345..34514b6 100644
--- a/updater/install.cpp
+++ b/updater/install.cpp
@@ -46,6 +46,7 @@
 #include <android-base/properties.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
+#include <android-base/unique_fd.h>
 #include <applypatch/applypatch.h>
 #include <bootloader_message/bootloader_message.h>
 #include <ext4_utils/wipe.h>
@@ -56,7 +57,6 @@
 #include <ziparchive/zip_archive.h>
 
 #include "edify/expr.h"
-#include "otafault/ota_io.h"
 #include "otautil/dirutil.h"
 #include "otautil/error_code.h"
 #include "otautil/mounts.h"
@@ -137,8 +137,8 @@
       return StringValue("");
     }
 
-    unique_fd fd(TEMP_FAILURE_RETRY(
-        ota_open(dest_path.c_str(), O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR)));
+    android::base::unique_fd fd(TEMP_FAILURE_RETRY(
+        open(dest_path.c_str(), O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR)));
     if (fd == -1) {
       PLOG(ERROR) << name << ": can't open " << dest_path << " for write";
       return StringValue("");
@@ -152,11 +152,12 @@
                  << "\": " << ErrorCodeString(ret);
       success = false;
     }
-    if (ota_fsync(fd) == -1) {
+    if (fsync(fd) == -1) {
       PLOG(ERROR) << "fsync of \"" << dest_path << "\" failed";
       success = false;
     }
-    if (ota_close(fd) == -1) {
+
+    if (close(fd.release()) != 0) {
       PLOG(ERROR) << "close of \"" << dest_path << "\" failed";
       success = false;
     }
@@ -614,33 +615,12 @@
   const std::string& filename = args[0];
   const std::string& key = args[1];
 
-  struct stat st;
-  if (stat(filename.c_str(), &st) < 0) {
-    return ErrorAbort(state, kFileGetPropFailure, "%s: failed to stat \"%s\": %s", name,
-                      filename.c_str(), strerror(errno));
-  }
-
-  constexpr off_t MAX_FILE_GETPROP_SIZE = 65536;
-  if (st.st_size > MAX_FILE_GETPROP_SIZE) {
-    return ErrorAbort(state, kFileGetPropFailure, "%s too large for %s (max %lld)",
-                      filename.c_str(), name, static_cast<long long>(MAX_FILE_GETPROP_SIZE));
-  }
-
-  std::string buffer(st.st_size, '\0');
-  unique_file f(ota_fopen(filename.c_str(), "rb"));
-  if (f == nullptr) {
-    return ErrorAbort(state, kFileOpenFailure, "%s: failed to open %s: %s", name, filename.c_str(),
-                      strerror(errno));
-  }
-
-  if (ota_fread(&buffer[0], 1, st.st_size, f.get()) != static_cast<size_t>(st.st_size)) {
-    ErrorAbort(state, kFreadFailure, "%s: failed to read %zu bytes from %s", name,
-               static_cast<size_t>(st.st_size), filename.c_str());
+  std::string buffer;
+  if (!android::base::ReadFileToString(filename, &buffer)) {
+    ErrorAbort(state, kFreadFailure, "%s: failed to read %s", name, filename.c_str());
     return nullptr;
   }
 
-  ota_fclose(f);
-
   std::vector<std::string> lines = android::base::Split(buffer, "\n");
   for (size_t i = 0; i < lines.size(); i++) {
     std::string line = android::base::Trim(lines[i]);
@@ -913,7 +893,12 @@
   if (!android::base::ParseUint(len_str.c_str(), &len)) {
     return nullptr;
   }
-  unique_fd fd(ota_open(filename.c_str(), O_WRONLY, 0644));
+  android::base::unique_fd fd(open(filename.c_str(), O_WRONLY));
+  if (fd == -1) {
+    PLOG(ERROR) << "Failed to open " << filename;
+    return StringValue("");
+  }
+
   // The wipe_block_device function in ext4_utils returns 0 on success and 1
   // for failure.
   int status = wipe_block_device(fd, len);
diff --git a/updater/updater.cpp b/updater/updater.cpp
index e06d453..e87c57a 100644
--- a/updater/updater.cpp
+++ b/updater/updater.cpp
@@ -31,7 +31,6 @@
 #include <ziparchive/zip_archive.h>
 
 #include "edify/expr.h"
-#include "otafault/config.h"
 #include "otautil/dirutil.h"
 #include "otautil/error_code.h"
 #include "otautil/sysutil.h"
@@ -47,8 +46,6 @@
 // (Note it's "updateR-script", not the older "update-script".)
 static constexpr const char* SCRIPT_NAME = "META-INF/com/google/android/updater-script";
 
-extern bool have_eio_error;
-
 struct selabel_handle *sehandle;
 
 static void UpdaterLogger(android::base::LogId /* id */, android::base::LogSeverity /* severity */,
@@ -166,15 +163,10 @@
       printf("unexpected argument: %s", argv[4]);
     }
   }
-  ota_io_init(za, state.is_retry);
 
   std::string result;
   bool status = Evaluate(&state, root, &result);
 
-  if (have_eio_error) {
-    fprintf(cmd_pipe, "retry_update\n");
-  }
-
   if (!status) {
     if (state.errmsg.empty()) {
       LOG(ERROR) << "script aborted (no error message)";
@@ -206,6 +198,9 @@
       if (state.cause_code == kPatchApplicationFailure) {
         LOG(INFO) << "Patch application failed, retry update.";
         fprintf(cmd_pipe, "retry_update\n");
+      } else if (state.cause_code == kEioFailure) {
+        LOG(INFO) << "Update failed due to EIO, retry update.";
+        fprintf(cmd_pipe, "retry_update\n");
       }
     }