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/*
Copyright (c) 2017, MariaDB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
#include <sys/statvfs.h>
#include <sys/types.h>
#include <mntent.h>
#include <sql_class.h>
#include <table.h>
#include <sql_acl.h> /* check_global_access() */
bool schema_table_store_record(THD *thd, TABLE *table);
namespace
{
struct st_mysql_information_schema disks_table_info = { MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION };
ST_FIELD_INFO disks_table_fields[]=
{
{ "Disk", PATH_MAX, MYSQL_TYPE_STRING, 0, 0 ,0, 0 },
{ "Path", PATH_MAX, MYSQL_TYPE_STRING, 0, 0 ,0, 0 },
{ "Total", 32, MYSQL_TYPE_LONG, 0, 0 ,0 ,0 }, // Total amount available
{ "Used", 32, MYSQL_TYPE_LONG, 0, 0 ,0 ,0 }, // Amount of space used
{ "Available", 32, MYSQL_TYPE_LONG, 0, 0 ,0 ,0 }, // Amount available to users other than root.
{ 0, 0, MYSQL_TYPE_NULL, 0, 0, 0, 0 }
};
int disks_table_add_row(THD* pThd,
TABLE* pTable,
const char* zDisk,
const char* zPath,
const struct statvfs& info)
{
// From: http://pubs.opengroup.org/onlinepubs/009695399/basedefs/sys/statvfs.h.html
//
// f_frsize Fundamental file system block size.
// f_blocks Total number of blocks on file system in units of f_frsize.
// f_bfree Total number of free blocks.
// f_bavail Number of free blocks available to non-privileged process.
size_t total = (info.f_frsize * info.f_blocks) / 1024;
size_t used = (info.f_frsize * (info.f_blocks - info.f_bfree)) / 1024;
size_t avail = (info.f_frsize * info.f_bavail) / 1024;
pTable->field[0]->store(zDisk, strlen(zDisk), system_charset_info);
pTable->field[1]->store(zPath, strlen(zPath), system_charset_info);
pTable->field[2]->store(total);
pTable->field[3]->store(used);
pTable->field[4]->store(avail);
// 0 means success.
return (schema_table_store_record(pThd, pTable) != 0) ? 1 : 0;
}
int disks_table_add_row(THD* pThd, TABLE* pTable, const char* zDisk, const char* zPath)
{
int rv = 0;
struct statvfs info;
if (statvfs(zPath, &info) == 0) // We ignore failures.
{
rv = disks_table_add_row(pThd, pTable, zDisk, zPath, info);
}
return rv;
}
int disks_fill_table(THD* pThd, TABLE_LIST* pTables, Item* pCond)
{
int rv = 1;
TABLE* pTable = pTables->table;
if (check_global_access(pThd, FILE_ACL, true))
return 0;
FILE* pFile = setmntent("/etc/mtab", "r");
if (pFile)
{
const size_t BUFFER_SIZE = 4096; // 4K should be sufficient.
char* pBuffer = new (std::nothrow) char [BUFFER_SIZE];
if (pBuffer)
{
rv = 0;
struct mntent ent;
struct mntent* pEnt;
while ((rv == 0) && (pEnt = getmntent_r(pFile, &ent, pBuffer, BUFFER_SIZE)))
{
// We only report the ones that refer to physical disks.
if (pEnt->mnt_fsname[0] == '/')
{
rv = disks_table_add_row(pThd, pTable, pEnt->mnt_fsname, pEnt->mnt_dir);
}
}
delete [] pBuffer;
}
else
{
rv = 1;
}
endmntent(pFile);
}
return rv;
}
int disks_table_init(void *ptr)
{
ST_SCHEMA_TABLE* pSchema_table = (ST_SCHEMA_TABLE*)ptr;
pSchema_table->fields_info = disks_table_fields;
pSchema_table->fill_table = disks_fill_table;
return 0;
}
}
extern "C"
{
maria_declare_plugin(disks)
{
MYSQL_INFORMATION_SCHEMA_PLUGIN,
&disks_table_info, /* type-specific descriptor */
"DISKS", /* table name */
"Johan Wikman", /* author */
"Disk space information", /* description */
PLUGIN_LICENSE_GPL, /* license type */
disks_table_init, /* init function */
NULL, /* deinit function */
0x0101, /* version = 1.1 */
NULL, /* no status variables */
NULL, /* no system variables */
"1.1", /* String version representation */
MariaDB_PLUGIN_MATURITY_STABLE /* Maturity (see include/mysql/plugin.h)*/
}
mysql_declare_plugin_end;
}
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