commit b92e5b5c4882b2b23c091132a5206ecfa3ac3fc8
author Jaegeuk Kim <jaegeuk@google.com> Thu Jan 12 13:08:15 2023 -0800
committer Jaegeuk Kim <jaegeuk@google.com> Sat Jan 14 10:29:31 2023 -0800
tree 817f97ec1723552fd30e0dc1b35c8fd96a43cde1
parent 9b9924b412c9fc0d6c152eb4de81506269f76b1e

Find a zoned partition automatically

Since we cannot create a gpt table on zoned LU, we cannot make a generic symlink
from it. Instead, let's make it by uevent, "/dev/block/by-name/zoned_device".
Note that, we support only one zoned device in the system.

Bug: 265180564
Change-Id: Ie62b0fd68b77e3e43cf0f5c5cad9503150174271
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>

fs_mgr/fs_mgr_fstab.cpp

diff --git a/fs_mgr/fs_mgr_fstab.cpp b/fs_mgr/fs_mgr_fstab.cpp
index 36bd75d..598a3d2 100644
--- a/fs_mgr/fs_mgr_fstab.cpp
+++ b/fs_mgr/fs_mgr_fstab.cpp
@@ -304,19 +304,16 @@
             if (!ParseByteCount(arg, &entry->zram_backingdev_size)) {
                 LWARNING << "Warning: zram_backingdev_size= flag malformed: " << arg;
             }
-        } else if (StartsWith(flag, "zoned_device=")) {
-            std::string zoned;
-            if (ReadFileToString("/sys/class/block/" + arg + "/queue/zoned", &zoned) &&
-                android::base::StartsWith(zoned, "host-managed")) {
-                entry->zoned_device = "/dev/block/" + arg;
+        } else if (flag == "zoned_device") {
+            if (access("/dev/block/by-name/zoned_device", F_OK) == 0) {
+                entry->zoned_device = "/dev/block/by-name/zoned_device";
 
                 // atgc in f2fs does not support a zoned device
                 auto options = Split(entry->fs_options, ",");
                 options.erase(std::remove(options.begin(), options.end(), "atgc"), options.end());
                 entry->fs_options = android::base::Join(options, ",");
-                LINFO << "Removed ATGC in fs_options as " << entry->fs_options;
-            } else {
-                LWARNING << "Warning: cannot find the zoned device: " << arg;
+                LINFO << "Removed ATGC in fs_options as " << entry->fs_options
+                      << " for zoned device=" << entry->zoned_device;
             }
         } else {
             LWARNING << "Warning: unknown flag: " << flag;

init/devices.cpp

diff --git a/init/devices.cpp b/init/devices.cpp
index 8bc6e52..39442a0 100644
--- a/init/devices.cpp
+++ b/init/devices.cpp
@@ -431,6 +431,12 @@
         }
     }
 
+    std::string model;
+    if (ReadFileToString("/sys/class/block/" + uevent.device_name + "/queue/zoned", &model) &&
+        !StartsWith(model, "none")) {
+        links.emplace_back("/dev/block/by-name/zoned_device");
+    }
+
     auto last_slash = uevent.path.rfind('/');
     links.emplace_back(link_path + "/" + uevent.path.substr(last_slash + 1));