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Automatically check whether to disable cache during prepare

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This commit is contained in:
Vitaliy Filippov
2022-09-03 02:04:21 +03:00
parent bd11db5d0a
commit 9481456dfe
7 changed files with 98 additions and 80 deletions
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src/disk_tool_udev.cpp
-64
View File
@@ -2,7 +2,6 @@
// License: VNPL-1.1 (see README.md for details)
#include <sys/file.h>
#include <dirent.h>
#include "disk_tool.h"
#include "rw_blocking.h"
@@ -311,69 +310,6 @@ int disk_tool_t::exec_osd(std::string device)
return 0;
}
// returns 1 = warning, -1 = error, 0 = success
static int disable_cache(std::string dev)
{
auto parent_dev = get_parent_device(dev);
if (parent_dev == "")
return 1;
auto scsi_disk = "/sys/block/"+parent_dev+"/device/scsi_disk";
DIR *dir = opendir(scsi_disk.c_str());
if (!dir)
{
if (errno == ENOENT)
{
// Not a SCSI/SATA device, just check /sys/block/.../queue/write_cache
return check_queue_cache(dev.substr(5), parent_dev);
}
else
{
fprintf(stderr, "Can't read directory %s: %s\n", scsi_disk.c_str(), strerror(errno));
return 1;
}
}
else
{
dirent *de = readdir(dir);
while (de && de->d_name[0] == '.' && (de->d_name[1] == 0 || de->d_name[1] == '.' && de->d_name[2] == 0))
de = readdir(dir);
if (!de)
{
// Not a SCSI/SATA device, just check /sys/block/.../queue/write_cache
closedir(dir);
return check_queue_cache(dev.substr(5), parent_dev);
}
scsi_disk += "/";
scsi_disk += de->d_name;
if (readdir(dir) != NULL)
{
// Error, multiple scsi_disk/* entries
closedir(dir);
fprintf(stderr, "Multiple entries in %s found\n", scsi_disk.c_str());
return 1;
}
closedir(dir);
// Check cache_type
scsi_disk += "/cache_type";
std::string cache_type = read_file(scsi_disk);
if (cache_type == "")
return 1;
if (cache_type == "write back")
{
int fd = open(scsi_disk.c_str(), O_WRONLY);
if (fd < 0 || write_blocking(fd, (void*)"write through", strlen("write through")) != strlen("write through"))
{
if (fd >= 0)
close(fd);
fprintf(stderr, "Can't write to %s: %s\n", scsi_disk.c_str(), strerror(errno));
return -1;
}
close(fd);
}
}
return 0;
}
static int check_disabled_cache(std::string dev)
{
int r = disable_cache(dev);