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Auto-guess atomic_write_size from /sys

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This commit is contained in:
Vitaliy Filippov
2025-12-02 01:52:12 +03:00
parent eaff4509ca
commit 959f792f82
8 changed files with 48 additions and 2 deletions
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src/disk_tool/disk_tool_prepare.cpp
+14
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@@ -32,6 +32,8 @@ int disk_tool_t::prepare_one(std::map<std::string, std::string> options, int is_
"discard_on_start",
"min_discard_size",
"discard_granularity",
"atomic_write_size",
"use_atomic_flag",
};
if (options.find("force") == options.end())
{
@@ -58,6 +60,18 @@ int disk_tool_t::prepare_one(std::map<std::string, std::string> options, int is_
return 1;
}
}
if (options.find("atomic_write_size") == options.end())
{
auto data_dev = realpath_str(options["data_device"], false);
uint64_t atomic_write_size = get_atomic_write_size(data_dev);
if (atomic_write_size > 4096)
{
fprintf(stderr, "Data device %s supports atomic writes up to %ju bytes, enabling. Enjoy faster writes!\n",
data_dev.c_str(), atomic_write_size);
options["atomic_write_size"] = std::to_string(atomic_write_size);
options["use_atomic_flag"] = "1";
}
}
for (auto dev: std::vector<std::string>{"data", "meta", "journal"})
{
if (options[dev+"_device"] != "" && options["disable_"+dev+"_fsync"] == "auto")