refactor io sure

Signed-off-by: liulanzheng <[email protected]>

src/CMakeLists.txt

@@ -10,7 +10,6 @@ add_subdirectory(overlaybd)
 add_library(overlaybd_image_lib
   image_file.cpp
   image_service.cpp
-  sure_file.cpp
   switch_file.cpp
   bk_download.cpp
   prefetch.cpp

src/image_file.cpp

@@ -31,7 +31,6 @@
 #include "overlaybd/zfile/zfile.h"
 #include "config.h"
 #include "image_file.h"
-#include "sure_file.h"
 #include "switch_file.h"
 #include "overlaybd/gzip/gz.h"
 #include "overlaybd/gzindex/gzfile.h"
@@ -168,13 +167,6 @@ IFile *ImageFile::__open_ro_remote(const std::string &dir, const std::string &di
         LOG_ERROR_RETURN(0, nullptr, "failed to open switch file `", url);
     }
 
-    IFile *sure_file = new_sure_file(switch_file, this);
-    if (!sure_file) {
-        set_failed("failed to open sure file `" + url);
-        delete switch_file;
-        LOG_ERROR_RETURN(0, nullptr, "failed to open sure file `", url);
-    }
-
     if (conf.HasMember("download") && conf.download().enable() == 1) {
         // download from registry, verify sha256 after downloaded.
         IFile *srcfile = image_service.global_fs.srcfs->open(url.c_str(), O_RDONLY);
@@ -189,7 +181,7 @@ IFile *ImageFile::__open_ro_remote(const std::string &dir, const std::string &di
         }
     }
 
-    return sure_file;
+    return switch_file;
 }
 
 void ImageFile::start_bk_dl_thread() {
@@ -370,28 +362,27 @@ LSMT::IFileRW *ImageFile::open_upper(ImageConfigNS::UpperConfig &upper) {
     IFile *idx_file = NULL;
     IFile *target_file = NULL;
     LSMT::IFileRW *ret = NULL;
-
-    data_file = new_sure_file_by_path(upper.data().c_str(), O_RDWR, this);
+    data_file = open_localfile_adaptor(upper.data().c_str(), O_RDWR, 0644);
     if (!data_file) {
         LOG_ERROR("open(`,flags), `:`", upper.data(), errno, strerror(errno));
         goto ERROR_EXIT;
     }
 
-    idx_file = new_sure_file_by_path(upper.index().c_str(), O_RDWR, this);
+    idx_file = open_localfile_adaptor(upper.index().c_str(), O_RDWR, 0644);
     if (!idx_file) {
         LOG_ERROR("open(`,flags), `:`", upper.index(), errno, strerror(errno));
         goto ERROR_EXIT;
     }
 
     if (upper.target() != "") {
         LOG_INFO("turboOCIv1 upper layer : `, `, `, `", upper.index(), upper.data(), upper.target());
-        target_file = new_sure_file_by_path(upper.target().c_str(), O_RDWR, this);
+        target_file = open_localfile_adaptor(upper.target().c_str(), O_RDWR, 0644);
         if (!target_file) {
             LOG_ERROR("open(`,flags), `:`", upper.target(), errno, strerror(errno));
             goto ERROR_EXIT;
         }
         if (upper.gzipIndex() != "") {
-            auto gzip_index = new_sure_file_by_path(upper.gzipIndex().c_str(), O_RDWR, this);
+            auto gzip_index = open_localfile_adaptor(upper.gzipIndex().c_str(), O_RDWR, 0644);
             if (!gzip_index) {
                 LOG_ERROR("open(`,flags), `:`", upper.gzipIndex(), errno, strerror(errno));
                 goto ERROR_EXIT;

src/main.cpp

@@ -94,6 +94,29 @@ class TCMULoop {
     }
 };
 
+using SureIODelegate = Delegate<ssize_t, const struct iovec *, int, off_t>;
+
+ssize_t sure(SureIODelegate io, const struct iovec *iov, int iovcnt, off_t offset) {
+    auto time_st = photon::now;
+    uint64_t try_cnt = 0, sleep_period = 20UL * 1000;
+again:
+    if (photon::now - time_st > 7LL * 24 * 60 * 60 * 1000 * 1000 /*7days*/) {
+        LOG_ERROR_RETURN(EIO, -1, "sure request timeout, offset: `", offset);
+    }
+    ssize_t ret = io(iov, iovcnt, offset);
+    if (ret >= 0) {
+        return ret;
+    }
+    if (try_cnt % 10 == 0) {
+        LOG_ERROR("io request failed, offset: `, ret: `, retry times: `, errno:`", offset, ret,
+                  try_cnt, errno);
+    }
+    try_cnt++;
+    photon::thread_usleep(sleep_period);
+    sleep_period = std::min(sleep_period * 2, 30UL * 1000 * 1000);
+    goto again;
+}
+
 void cmd_handler(struct tcmu_device *dev, struct tcmulib_cmd *cmd) {
     obd_dev *odev = (obd_dev *)tcmu_dev_get_private(dev);
     ImageFile *file = odev->file;
@@ -142,7 +165,8 @@ void cmd_handler(struct tcmu_device *dev, struct tcmulib_cmd *cmd) {
     case READ_12:
     case READ_16:
         length = tcmu_iovec_length(cmd->iovec, cmd->iov_cnt);
-        ret = file->preadv(cmd->iovec, cmd->iov_cnt, tcmu_cdb_to_byte(dev, cmd->cdb));
+        ret = sure({file, &ImageFile::preadv}, cmd->iovec, cmd->iov_cnt,
+                   tcmu_cdb_to_byte(dev, cmd->cdb));
         if (ret == length) {
             tcmulib_command_complete(dev, cmd, TCMU_STS_OK);
         } else {