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Disable use_atomic_flag by default

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This commit is contained in:
Vitaliy Filippov
2025-12-22 01:52:07 +03:00
parent 21cf5c8815
commit 8ec7faa675
6 changed files with 117 additions and 44 deletions
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src/disk_tool/disk_tool_prepare.cpp
+15 -12
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@@ -91,21 +91,24 @@ int disk_tool_t::prepare_one(std::map<std::string, std::string> options, int is_
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)
if (data_dev.substr(0, 9) == "/dev/nvme")
{
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";
uint64_t atomic_write_size = get_atomic_write_size(data_dev);
if (atomic_write_size > 4096)
{
// FIXME: Enable use_atomic_flag when the kernel does checks correctly
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);
if (!atomic_warned)
{
fprintf(stderr, "WARNING: RWF_ATOMIC can't be used because Linux checks atomic writes incorrectly.\n"
" Please don't change scheduler from default 'none' and check use_atomic_flag documentation for more details.\n");
atomic_warned = true;
}
}
}
}
else if (options.find("use_atomic_flag") == options.end() &&
parse_size(options["atomic_write_size"]) > 4096)
{
fprintf(stderr, "Atomic writes larger than 4 KB are enabled manually, enabling use_atomic_flag too.\n");
options["use_atomic_flag"] = "1";
}
for (auto dev: std::vector<std::string>{"data", "meta", "journal"})
{
if (options[dev+"_device"] != "" && options["disable_"+dev+"_fsync"] == "auto")