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fix for nvme device path (#4866)

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Summary:
nvme device path doesn't have "block" as like "nvme/nvme0/nvme0n1"
or "nvme/nvme0/nvme0n1/nvme0n1p1". the last directory such as
"nvme0n1p1" should be removed if nvme drive is partitioned.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4866

Differential Revision: D13627824

Pulled By: riversand963

fbshipit-source-id: 09ab968f349f3dbb890beea20193f1359b17d317
This commit is contained in:
Young Tack Jin 2019-01-31 19:03:26 -08:00 committed by Facebook Github Bot
parent 842cdc11dd
commit 4091597c67
1 changed files with 10 additions and 3 deletions
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13
env/io_posix.cc vendored
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@ -83,10 +83,14 @@ size_t GetLogicalBufferSize(int __attribute__((__unused__)) fd) {
if (!device_dir.empty() && device_dir.back() == '/') {
device_dir.pop_back();
}
// NOTE: sda3 does not have a `queue/` subdir, only the parent sda has it.
// NOTE: sda3 and nvme0n1p1 do not have a `queue/` subdir, only the parent sda
// and nvme0n1 have it.
// $ ls -al '/sys/dev/block/8:3'
// lrwxrwxrwx. 1 root root 0 Jun 26 01:38 /sys/dev/block/8:3 ->
// ../../block/sda/sda3
// $ ls -al '/sys/dev/block/259:4'
// lrwxrwxrwx 1 root root 0 Jan 31 16:04 /sys/dev/block/259:4 ->
// ../../devices/pci0000:17/0000:17:00.0/0000:18:00.0/nvme/nvme0/nvme0n1/nvme0n1p1
size_t parent_end = device_dir.rfind('/', device_dir.length() - 1);
if (parent_end == std::string::npos) {
return kDefaultPageSize;
@ -95,8 +99,11 @@ size_t GetLogicalBufferSize(int __attribute__((__unused__)) fd) {
if (parent_begin == std::string::npos) {
return kDefaultPageSize;
}
if (device_dir.substr(parent_begin + 1, parent_end - parent_begin - 1) !=
"block") {
std::string parent =
device_dir.substr(parent_begin + 1, parent_end - parent_begin - 1);
std::string child = device_dir.substr(parent_end + 1, std::string::npos);
if (parent != "block" &&
(child.compare(0, 4, "nvme") || child.find('p') != std::string::npos)) {
device_dir = device_dir.substr(0, parent_end);
}
std::string fname = device_dir + "/queue/logical_block_size";