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mmapstorage.c
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/**
* @file
*
* @brief Source for mmapstorage plugin
*
* @copyright BSD License (see LICENSE.md or https://www.libelektra.org)
*
*/
#define _XOPEN_SOURCE 600
/* -- Imports --------------------------------------------------------------------------------------------------------------------------- */
#include "mmapstorage.h"
#include "dynarray.h"
#include "internal.h"
#include <kdbassert.h>
#include <kdberrors.h>
#include <kdbhelper.h>
#include <kdblogger.h>
#include <kdbprivate.h>
#ifdef HAVE_KDBCONFIG_H
#include "kdbconfig.h"
#endif
#include <errno.h>
#include <fcntl.h> // fcntl()
#include <limits.h> // SSIZE_MAX
#include <stdint.h> // uintN_t, uintptr_t
#include <stdio.h> // fopen(), fileno()
#include <stdlib.h> // strtol()
#include <string.h> // memcmp()
#include <sys/mman.h> // mmap()
#include <sys/stat.h> // stat(), fstat()
#include <sys/types.h> // ftruncate (), size_t
#include <unistd.h> // close(), ftruncate(), unlink(), read(), write()
#ifdef ELEKTRA_MMAP_CHECKSUM
#include <zlib.h> // crc32()
#endif
/* -- Global declarations---------------------------------------------------------------------------------------------------------------- */
static KeySet magicKeySet;
static Key magicKey;
static MmapMetaData magicMmapMetaData;
#ifdef ELEKTRA_ENABLE_OPTIMIZATIONS
static Opmphm magicOpmphm;
static OpmphmPredictor magicOpmphmPredictor;
#endif
typedef enum
{
MODE_STORAGE = 1,
MODE_GLOBALCACHE = 1 << 1,
MODE_NONREGULAR_FILE = 1 << 2
} PluginMode;
/* -- File handling --------------------------------------------------------------------------------------------------------------------- */
/**
* @brief Wrapper for open().
*
* @param parentKey containing the filename
* @param flags file access mode
* @param openMode file mode bits when file is created
* @param mode the current plugin mode
*
* @return file descriptor
*/
static int openFile (Key * parentKey, int flag, mode_t openMode, PluginMode mode)
{
int fd;
ELEKTRA_LOG_DEBUG ("opening file %s", keyString (parentKey));
if ((fd = open (keyString (parentKey), flag, openMode)) == -1)
{
ELEKTRA_MMAP_LOG_WARNING ("error opening file %s", keyString (parentKey));
}
return fd;
}
/**
* @brief Wrapper for ftruncate().
*
* @param fd the file descriptor
* @param mmapsize size of the mapped region
* @param parentKey holding the filename, for debug purposes
* @param mode the current plugin mode
*
* @retval 1 on success
* @retval -1 if ftruncate() failed
*/
static int truncateFile (int fd, size_t mmapsize, Key * parentKey ELEKTRA_UNUSED, PluginMode mode)
{
ELEKTRA_LOG_DEBUG ("truncating file %s", keyString (parentKey));
if ((ftruncate (fd, mmapsize)) == -1)
{
ELEKTRA_MMAP_LOG_WARNING ("error truncating file %s", keyString (parentKey));
return -1;
}
return 1;
}
/**
* @brief Wrapper for fstat().
*
* @param fd the file descriptor
* @param sbuf the stat structure
* @param parentKey holding the filename
* @param mode the current plugin mode
*
* @retval 1 on success
* @retval -1 if fstat() failed
*/
static int fstatFile (int fd, struct stat * sbuf, Key * parentKey ELEKTRA_UNUSED, PluginMode mode)
{
ELEKTRA_LOG_DEBUG ("fstat() on file %s", keyString (parentKey));
memset (sbuf, 0, sizeof (struct stat));
if (fstat (fd, sbuf) == -1)
{
ELEKTRA_MMAP_LOG_WARNING ("error on fstat() for file %s", keyString (parentKey));
return -1;
}
return 1;
}
/**
* @brief Wrapper for mmap().
*
* @param addr address hint, where the mapping should start
* @param fd file descriptor of the file to be mapped
* @param mmapSize size of the mapped region
* @param mapOpts mmap flags (MAP_PRIVATE, MAP_FIXED, ...)
* @param parentKey holding the filename, for debug purposes
* @param mode the current plugin mode
*
* @return pointer to mapped region on success, MAP_FAILED on failure
*/
static char * mmapFile (void * addr, int fd, size_t mmapSize, int mapOpts, Key * parentKey ELEKTRA_UNUSED, PluginMode mode)
{
ELEKTRA_LOG_DEBUG ("mapping file %s", keyString (parentKey));
char * mappedRegion = MAP_FAILED;
if (test_bit (mode, MODE_NONREGULAR_FILE))
{
mappedRegion = elektraCalloc (mmapSize);
if (!mappedRegion)
{
ELEKTRA_MMAP_LOG_WARNING ("error allocating buffer for file %s\nmmapSize: %zu", keyString (parentKey), mmapSize);
return MAP_FAILED;
}
}
else
{
mappedRegion = mmap (addr, mmapSize, PROT_READ | PROT_WRITE, mapOpts, fd, 0);
if (mappedRegion == MAP_FAILED)
{
ELEKTRA_MMAP_LOG_WARNING ("error mapping file %s\nmmapSize: %zu", keyString (parentKey), mmapSize);
return MAP_FAILED;
}
}
return mappedRegion;
}
/**
* @brief Copy file
*
* @param sourceFd source file descriptor
* @param destFd destination file descriptor
*
* @retval 0 on success
* @retval -1 if any error occured
*/
static int copyFile (int sourceFd, int destFd)
{
ssize_t readBytes = 0;
char buf[ELEKTRA_MMAP_BUFSIZE];
while ((readBytes = read (sourceFd, buf, ELEKTRA_MMAP_BUFSIZE)) > 0)
{
if (readBytes <= 0)
{
if (errno == EINTR)
continue;
else
return -1;
}
ssize_t writtenBytes = 0;
while (readBytes > 0)
{
writtenBytes = write (destFd, buf, readBytes);
if (writtenBytes <= 0)
{
if (errno == EINTR)
continue;
else
return -1;
}
readBytes -= writtenBytes;
}
}
return 0;
}
/**
* @brief Copy file to anonymous temporary file
*
* This function is needed to make mmapstorage compatible
* with any file. The `mmap()` syscall only supports regular
* files.
*
* @param fd source file descriptor
* @param sbuf the stat structure
* @param parentKey holding the file name
* @param mode the current plugin mode
*
* @retval 0 on success
* @retval -1 if any error occured
*/
static int copyToAnonymousTempfile (int fd, struct stat * sbuf, Key * parentKey, PluginMode mode)
{
int tmpFd = 0;
char name[] = ELEKTRA_MMAP_TMP_NAME;
if ((tmpFd = mkstemp (name)) < 0)
{
return -1;
}
ELEKTRA_LOG_DEBUG ("using anon tmp file: %s", name);
keySetString (parentKey, name);
// use anonymous file
if (unlink (name) != 0)
{
ELEKTRA_MMAP_LOG_WARNING ("could not unlink");
return -1;
}
copyFile (fd, tmpFd);
if (close (fd) != 0)
{
ELEKTRA_MMAP_LOG_WARNING ("could not close");
return -1;
}
// replace old file
fd = tmpFd;
if (fstatFile (fd, sbuf, parentKey, mode) != 1)
{
return -1;
}
return fd;
}
/* -- Internal Functions --------------------------------------------------------------------------------------------------------------- */
/**
* @brief MmapHeader initializer.
*
* @param mmapHeader to initialize
*/
static void initHeader (MmapHeader * mmapHeader)
{
memset (mmapHeader, 0, SIZEOF_MMAPHEADER);
mmapHeader->mmapMagicNumber = ELEKTRA_MAGIC_MMAP_NUMBER;
mmapHeader->formatVersion = ELEKTRA_MMAP_FORMAT_VERSION;
#ifdef ELEKTRA_MMAP_CHECKSUM
set_bit (mmapHeader->formatFlags, MMAP_FLAG_CHECKSUM);
#endif
#ifdef ELEKTRA_ENABLE_OPTIMIZATIONS
set_bit (mmapHeader->formatFlags, MMAP_FLAG_OPMPHM);
#endif
}
/**
* @brief MmapMetaData initializer.
*
* @param mmapMetaData to initialize
*/
static void initMetaData (MmapMetaData * mmapMetaData)
{
memset (mmapMetaData, 0, SIZEOF_MMAPMETADATA);
}
/**
* @brief MmapFooter initializer.
*
* @param mmapFooter to initialize
*/
static void initFooter (MmapFooter * mmapFooter)
{
memset (mmapFooter, 0, SIZEOF_MMAPFOOTER);
mmapFooter->mmapMagicNumber = ELEKTRA_MAGIC_MMAP_NUMBER;
}
/**
* @brief Reads the MmapHeader and MmapMetaData from a file.
*
* @param fp file pointer to read the data from
* @param mmapHeader buffer where the MmapHeader is stored
* @param mmapMetaData buffer where the MmapMetaData is stored
*
* @retval -1 if magic number or format version was wrong
* @retval 0 if read succeeded, the magic number was read correctly and the format version matched
*/
static int readHeader (const char * mappedRegion, MmapHeader ** mmapHeader, MmapMetaData ** mmapMetaData)
{
*mmapHeader = (MmapHeader *) mappedRegion;
*mmapMetaData = (MmapMetaData *) (mappedRegion + OFFSET_MMAPMETADATA);
if ((*mmapHeader)->mmapMagicNumber == ELEKTRA_MAGIC_MMAP_NUMBER && (*mmapHeader)->formatVersion == ELEKTRA_MMAP_FORMAT_VERSION)
{
return 0;
}
return -1;
}
/**
* @brief Reads the MmapFooter from the end of the mapped region.
*
* @param mappedRegion pointer to the mapped region
* @param mmapHeader the MmapHeader containing the size of the allocation
*
* @retval -1 if the magic number did not match
* @retval 0 if the magic number matched
*/
static int readFooter (const char * mappedRegion, MmapHeader * mmapHeader)
{
MmapFooter * mmapFooter = (MmapFooter *) (mappedRegion + mmapHeader->allocSize - SIZEOF_MMAPFOOTER);
if (mmapFooter->mmapMagicNumber == ELEKTRA_MAGIC_MMAP_NUMBER)
{
return 0;
}
return -1;
}
/**
* @brief Writes the magic data for consistency checks.
*
* @param dest to write the data to.
*/
static void writeMagicData (const char * mappedRegion)
{
KeySet * destKeySet = (KeySet *) (mappedRegion + OFFSET_MAGIC_KEYSET);
Key * keyPtr = (Key *) (mappedRegion + OFFSET_MAGIC_KEY);
MmapMetaData * mmapMetaData = (MmapMetaData *) (mappedRegion + OFFSET_MAGIC_MMAPMETADATA);
memcpy (destKeySet, &magicKeySet, SIZEOF_KEYSET);
memcpy (keyPtr, &magicKey, SIZEOF_KEY);
memcpy (mmapMetaData, &magicMmapMetaData, SIZEOF_MMAPMETADATA);
#ifdef ELEKTRA_ENABLE_OPTIMIZATIONS
Opmphm * opmphm = (Opmphm *) (mappedRegion + OFFSET_MAGIC_OPMPHM);
OpmphmPredictor * opmphmPredictor = (OpmphmPredictor *) (mappedRegion + OFFSET_MAGIC_OPMPHMPREDICTOR);
memcpy (opmphm, &magicOpmphm, sizeof (Opmphm));
memcpy (opmphmPredictor, &magicOpmphmPredictor, sizeof (OpmphmPredictor));
#endif
}
/* -- Verification Functions ----------------------------------------------------------------------------------------------------------- */
/**
* @brief Generate magic number depending on pointer size.
*
* Generates magic number to detect arbitrary byte swaps.
* For each byte of the number, a different value is assigned.
* E.g.: Systems with 8-byte pointers will have the magic number 0x0706050403020100.
*
* @return generated magic number
*/
static uintptr_t generateMagicNumber (void)
{
uintptr_t ret = 0;
size_t ptrBytes = sizeof (void *);
for (uintptr_t i = 0; i < ptrBytes; ++i)
{
ret |= (i << (i * 8));
}
return ret;
}
/**
* @brief Magic KeySet initializer.
*
* @param magicNumber to detect arbitrary byte-swaps
*/
static void initMagicKeySet (const uintptr_t magicNumber)
{
magicKeySet.array = (Key **) magicNumber;
magicKeySet.size = SIZE_MAX;
magicKeySet.alloc = 0;
magicKeySet.cursor = (Key *) ~magicNumber;
magicKeySet.current = SIZE_MAX / 2;
magicKeySet.flags = KS_FLAG_MMAP_ARRAY | KS_FLAG_SYNC;
magicKeySet.refs = UINT16_MAX;
magicKeySet.reserved = 0;
#ifdef ELEKTRA_ENABLE_OPTIMIZATIONS
magicKeySet.opmphm = (Opmphm *) ELEKTRA_MMAP_MAGIC_BOM;
magicKeySet.opmphmPredictor = 0;
#endif
}
/**
* @brief Magic Key initializer.
*
* @param magicNumber to detect arbitrary byte-swaps
*/
static void initMagicKey (const uintptr_t magicNumber)
{
magicKey.data.v = (void *) ~magicNumber;
magicKey.dataSize = SIZE_MAX;
magicKey.key = (char *) magicNumber;
magicKey.keySize = UINT16_MAX;
magicKey.ukey = 0;
magicKey.keyUSize = 0;
magicKey.meta = (KeySet *) ELEKTRA_MMAP_MAGIC_BOM;
magicKey.flags = KEY_FLAG_MMAP_STRUCT | KEY_FLAG_MMAP_DATA | KEY_FLAG_MMAP_KEY | KEY_FLAG_SYNC;
magicKey.refs = UINT16_MAX / 2;
magicKey.reserved = UINT16_MAX;
}
/**
* @brief Magic MmapMetaData initializer.
*
* @param magicNumber to detect arbitrary byte-swaps
*/
static void initMagicMmapMetaData (void)
{
magicMmapMetaData.numKeySets = SIZE_MAX;
magicMmapMetaData.ksAlloc = 0;
magicMmapMetaData.numKeys = SIZE_MAX / 2;
}
#ifdef ELEKTRA_ENABLE_OPTIMIZATIONS
/**
* @brief Magic Opmphm initializer.
*
* @param magicNumber to detect arbitrary byte-swaps
*/
static void initMagicOpmphm (const uintptr_t magicNumber)
{
magicOpmphm.hashFunctionSeeds = (void *) magicNumber;
magicOpmphm.rUniPar = INT8_MAX;
magicOpmphm.componentSize = SIZE_MAX / 2;
magicOpmphm.graph = (void *) ~magicNumber;
magicOpmphm.size = SIZE_MAX;
}
/**
* @brief Magic OpmphmPredictor initializer.
*
* @param magicNumber to detect arbitrary byte-swaps
*/
static void initMagicOpmphmPredictor (const uintptr_t magicNumber)
{
magicOpmphmPredictor.history = UINT16_MAX;
magicOpmphmPredictor.patternTable = (void *) magicNumber;
magicOpmphmPredictor.size = SIZE_MAX / 2;
magicOpmphmPredictor.lookupCount = 0;
magicOpmphmPredictor.ksSize = SIZE_MAX;
}
#endif
/**
* @brief Verify the magic KeySet.
*
* @param ks keyset to verify
*
* @retval 0 if magic KeySet is consistent
* @retval -1 if magic KeySet is inconsistent
*/
static int verifyMagicKeySet (KeySet * ks)
{
if (!ks) return -1;
return memcmp (ks, &magicKeySet, SIZEOF_KEYSET);
}
/**
* @brief Verify the magic Key.
*
* @param key to verify
*
* @retval 0 if magic Key is consistent
* @retval -1 if magic Key is inconsistent
*/
static int verifyMagicKey (Key * key)
{
if (!key) return -1;
return memcmp (key, &magicKey, SIZEOF_KEY);
}
/**
* @brief Verify the magic MmapMetaData.
*
* @param mmapMetaData to verify
*
* @retval 0 if magic MmapMetaData is consistent
* @retval -1 if magic MmapMetaData is inconsistent
*/
static int verifyMagicMmapMetaData (MmapMetaData * mmapMetaData)
{
if (!mmapMetaData) return -1;
return memcmp (mmapMetaData, &magicMmapMetaData, SIZEOF_MMAPMETADATA);
}
#ifdef ELEKTRA_ENABLE_OPTIMIZATIONS
/**
* @brief Verify the magic Opmphm.
*
* @param opmphm to verify
*
* @retval 0 if magic Opmphm is consistent
* @retval -1 if magic Opmphm is inconsistent
*/
static int verifyMagicOpmphm (Opmphm * opmphm)
{
if (!opmphm) return -1;
return memcmp (opmphm, &magicOpmphm, sizeof (Opmphm));
}
/**
* @brief Verify the magic OpmphmPredictor.
*
* @param opmphmPredictor to verify
*
* @retval 0 if magic OpmphmPredictor is consistent
* @retval -1 if magic OpmphmPredictor is inconsistent
*/
static int verifyMagicOpmphmPredictor (OpmphmPredictor * opmphmPredictor)
{
if (!opmphmPredictor) return -1;
return memcmp (opmphmPredictor, &magicOpmphmPredictor, sizeof (OpmphmPredictor));
}
#endif
/**
* @brief Verify magic data in the mapped region.
*
* @param mappedRegion pointer to mapped region
*
* @retval 0 if magic data is consistent
* @retval -1 if magic data is inconsistent
*/
static int verifyMagicData (char * mappedRegion)
{
KeySet * destKeySet = (KeySet *) (mappedRegion + OFFSET_MAGIC_KEYSET);
Key * keyPtr = (Key *) (mappedRegion + OFFSET_MAGIC_KEY);
MmapMetaData * mmapMetaData = (MmapMetaData *) (mappedRegion + OFFSET_MAGIC_MMAPMETADATA);
if ((verifyMagicKey (keyPtr) != 0) || (verifyMagicKeySet (destKeySet) != 0) || (verifyMagicMmapMetaData (mmapMetaData) != 0))
{
return -1;
}
#ifdef ELEKTRA_ENABLE_OPTIMIZATIONS
Opmphm * opmphm = (Opmphm *) (mappedRegion + OFFSET_MAGIC_OPMPHM);
OpmphmPredictor * opmphmPredictor = (OpmphmPredictor *) (mappedRegion + OFFSET_MAGIC_OPMPHMPREDICTOR);
if ((verifyMagicOpmphm (opmphm) != 0) || (verifyMagicOpmphmPredictor (opmphmPredictor) != 0))
{
return -1;
}
#endif
return 0;
}
#ifdef ELEKTRA_MMAP_CHECKSUM
/**
* @brief Verify checksum of the critical mmap data.
*
* Verifies the CRC32 checksum of all KeySet and Key structs (including pointers/pointer arrays)
* as well as the MmapMetaData. Does not check Key name and value.
*
* @param mappedRegion pointer to mapped region
* @param mmapHeader containing the stored checksum and size of the checksum region
*
* @retval 0 if checksum was correct
* @retval -1 if there was a checksum mismatch
*/
static int verifyChecksum (char * mappedRegion, MmapHeader * mmapHeader, PluginMode mode)
{
// if file was written without checksum, we skip the check
if (!test_bit (mmapHeader->formatFlags, MMAP_FLAG_CHECKSUM)) return 0;
uint32_t checksum = crc32 (0L, Z_NULL, 0);
checksum = crc32 (checksum, (const unsigned char *) (mappedRegion + SIZEOF_MMAPHEADER), mmapHeader->cksumSize);
if (checksum != mmapHeader->checksum)
{
ELEKTRA_MMAP_LOG_WARNING ("old checksum: %ul", mmapHeader->checksum);
ELEKTRA_MMAP_LOG_WARNING ("new checksum: %ul", checksum);
return -1;
}
return 0;
}
#endif
/**
* @brief Calculates the size, in bytes, needed to store the KeySet in a mmap region.
*
* Iterates over the KeySet and calculates the complete size in bytes, needed to store the KeySet
* within a mapped region. The size includes all mmap meta-information, magic KeySet and Key for
* consistency checks, KeySets, meta-KeySets, Keys, meta-Keys, Key names and values.
* Copied meta-Keys are counted once for deduplication. If needed, padding is added to align the
* MmapFooter properly at the end of the mapping. When the plugin is in a global position,
* acting as a cache, the calculated size includes the global KeySet.
*
* The complete size and some other meta-information are stored in the MmapHeader and MmapMetaData.
* The DynArray stores the unique meta-Key pointers needed for deduplication.
*
* @param mmapHeader to store the allocation size
* @param mmapMetaData to store the number of KeySets and Keys
* @param returned the KeySet that should be stored
* @param global the global KeySet
* @param dynArray to store meta-key pointers for deduplication
*/
static void calculateMmapDataSize (MmapHeader * mmapHeader, MmapMetaData * mmapMetaData, KeySet * returned, KeySet * global,
DynArray * dynArray)
{
Key * cur;
ksRewind (returned);
size_t dataBlocksSize = 0; // sum of keyName and keyValue sizes
mmapMetaData->numKeys = 0;
mmapMetaData->numKeySets = 3; // include the magic, global and main keyset
mmapMetaData->ksAlloc = returned->alloc; // sum of allocation sizes for all meta-keysets
while ((cur = ksNext (returned)) != 0)
{
dataBlocksSize += (cur->keySize + cur->keyUSize + cur->dataSize);
if (cur->meta && cur->meta->size > 0)
{
++mmapMetaData->numKeySets;
Key * curMeta;
ksRewind (cur->meta);
while ((curMeta = ksNext (cur->meta)) != 0)
{
if (ELEKTRA_PLUGIN_FUNCTION (dynArrayFindOrInsert) (curMeta, dynArray) == 0)
{
// key was just inserted
dataBlocksSize += (curMeta->keySize + curMeta->keyUSize + curMeta->dataSize);
}
}
mmapMetaData->ksAlloc += (cur->meta->alloc);
}
}
if (global) // TODO: remove this code duplication
{
ELEKTRA_LOG_DEBUG ("calculate global keyset into size");
mmapMetaData->ksAlloc += global->alloc;
mmapMetaData->numKeys += global->size;
Key * globalKey;
ksRewind (global);
while ((globalKey = ksNext (global)) != 0)
{
dataBlocksSize += (globalKey->keySize + globalKey->keyUSize + globalKey->dataSize);
if (globalKey->meta && globalKey->meta->size > 0)
{
++mmapMetaData->numKeySets;
Key * curMeta;
ksRewind (globalKey->meta);
while ((curMeta = ksNext (globalKey->meta)) != 0)
{
if (ELEKTRA_PLUGIN_FUNCTION (dynArrayFindOrInsert) (curMeta, dynArray) == 0)
{
// key was just inserted
dataBlocksSize += (curMeta->keySize + curMeta->keyUSize + curMeta->dataSize);
}
}
mmapMetaData->ksAlloc += (globalKey->meta->alloc);
}
}
}
mmapMetaData->numKeys += returned->size + dynArray->size + 1; // +1 for magic Key
size_t opmphmSize = 0;
#ifdef ELEKTRA_ENABLE_OPTIMIZATIONS
// the OPMPHM structs are included regardless of existece in KeySet
// s.t. the format stays the same for all KeySets
opmphmSize = (sizeof (Opmphm) * 2) + (sizeof (OpmphmPredictor) * 2); // *2 for magic opmphm data
Opmphm * opmphm = returned->opmphm;
if (opmphm)
{
if (opmphm->rUniPar) dataBlocksSize += opmphm->rUniPar * sizeof (int32_t);
dataBlocksSize += opmphm->size;
}
OpmphmPredictor * opmphmPredictor = returned->opmphmPredictor;
if (opmphmPredictor)
{
dataBlocksSize += opmphmPredictor->size * sizeof (uint8_t);
}
ELEKTRA_LOG_DEBUG ("OPMPHM enabled, size: %zu", opmphmSize);
#endif
size_t keyArraySize = mmapMetaData->numKeys * SIZEOF_KEY;
mmapHeader->allocSize = (SIZEOF_MMAPMETADATA * 2) + opmphmSize + (SIZEOF_KEYSET * mmapMetaData->numKeySets) + keyArraySize +
dataBlocksSize + (mmapMetaData->ksAlloc * SIZEOF_KEY_PTR);
mmapHeader->cksumSize = mmapHeader->allocSize; // cksumSize now contains size of all critical data
size_t padding = sizeof (uint64_t) - (mmapHeader->allocSize % sizeof (uint64_t)); // alignment for MMAP Footer at end of mapping
mmapHeader->allocSize += SIZEOF_MMAPHEADER + padding + SIZEOF_MMAPFOOTER;
mmapMetaData->numKeys--; // don't include magic Key
mmapMetaData->numKeySets--; // don't include magic KeySet
}
/**
* @brief Write meta-keys to the mapped region.
*
* This function only writes all meta-keys to the mapped region.
* The meta-keys are later referenced in the meta-keysets.
*
* @param mmapAddr struct containing pointers to the mapped region
* @param dynArray containing deduplicated meta-keys
*/
static void writeMetaKeys (MmapAddr * mmapAddr, DynArray * dynArray)
{
if (dynArray->size == 0)
{
return;
}
// allocate space in DynArray to remember the addresses of mapped meta-keys
dynArray->mappedKeyArray = elektraCalloc (dynArray->size * sizeof (Key *));
// write the meta keys into place
for (size_t i = 0; i < dynArray->size; ++i)
{
Key * curMeta = dynArray->keyArray[i]; // old key location
Key * mmapMetaKey = (Key *) mmapAddr->keyPtr; // new key location
*mmapMetaKey = *curMeta;
mmapAddr->keyPtr += SIZEOF_KEY;
// move Key name
if (curMeta->key)
{
memcpy (mmapAddr->dataPtr, curMeta->key, curMeta->keySize);
mmapMetaKey->key = mmapAddr->dataPtr - mmapAddr->mmapAddrInt;
mmapAddr->dataPtr += curMeta->keySize;
mmapMetaKey->flags |= KEY_FLAG_MMAP_KEY;
}
// move Key unescaped name
if (curMeta->ukey)
{
memcpy (mmapAddr->dataPtr, curMeta->ukey, curMeta->keyUSize);
mmapMetaKey->ukey = mmapAddr->dataPtr - mmapAddr->mmapAddrInt;
mmapAddr->dataPtr += curMeta->keyUSize;
mmapMetaKey->flags |= KEY_FLAG_MMAP_KEY;
}
// move Key value
if (curMeta->data.v)
{
memcpy (mmapAddr->dataPtr, curMeta->data.v, curMeta->dataSize);
mmapMetaKey->data.v = mmapAddr->dataPtr - mmapAddr->mmapAddrInt;
mmapAddr->dataPtr += curMeta->dataSize;
mmapMetaKey->flags |= KEY_FLAG_MMAP_DATA;
}
// move Key itself
mmapMetaKey->flags |= KEY_FLAG_MMAP_STRUCT;
mmapMetaKey->meta = 0;
mmapMetaKey->refs = 0;
dynArray->mappedKeyArray[i] = mmapMetaKey;
}
}
/**
* @brief Writes a meta keyset of a key to the mapped region.
*
* @param key holding the meta-keyset
* @param mmapAddr structure holding pointers to the mapped region
* @param dynArray holding deduplicated references to meta-keys
*
* @return pointer to the new meta keyset
*/
static KeySet * writeMetaKeySet (Key * key, MmapAddr * mmapAddr, DynArray * dynArray)
{
// write the meta KeySet
if (!key->meta || !(key->meta->size > 0)) return 0;
KeySet * newMeta = (KeySet *) mmapAddr->metaKsPtr;
mmapAddr->metaKsPtr += SIZEOF_KEYSET;
newMeta->flags = key->meta->flags | KS_FLAG_MMAP_STRUCT | KS_FLAG_MMAP_ARRAY;
newMeta->array = (Key **) mmapAddr->metaKsArrayPtr;
mmapAddr->metaKsArrayPtr += SIZEOF_KEY_PTR * key->meta->alloc;
keyRewindMeta (key);
size_t metaKeyIndex = 0;
Key * mappedMetaKey = 0;
const Key * metaKey;
while ((metaKey = keyNextMeta (key)) != 0)
{
// get address of mapped key and store it in the new array
mappedMetaKey = dynArray->mappedKeyArray[ELEKTRA_PLUGIN_FUNCTION (dynArrayFind) ((Key *) metaKey, dynArray)];
newMeta->array[metaKeyIndex] = (Key *) ((char *) mappedMetaKey - mmapAddr->mmapAddrInt);
if (mappedMetaKey->refs < UINT16_MAX - 1)
{
++(mappedMetaKey->refs);
}
++metaKeyIndex;
}
newMeta->array[key->meta->size] = 0;
newMeta->array = (Key **) ((char *) newMeta->array - mmapAddr->mmapAddrInt);
newMeta->alloc = key->meta->alloc;
newMeta->size = key->meta->size;
newMeta = (KeySet *) ((char *) newMeta - mmapAddr->mmapAddrInt);
return newMeta;
}
/**
* @brief Writes the keys of the keyset to the mapped region.
*
* For each key, the corresponding meta keyset is also written
* to the mapped region.
*
* @param keySet holding the keys to be written to the mapped region
* @param mmapAddr structure holding pointers to the mapped region
* @param dynArray holding deduplicated meta-key pointers
*/
static void writeKeys (KeySet * keySet, MmapAddr * mmapAddr, DynArray * dynArray, PluginMode mode)
{
Key * cur;
size_t keyIndex = 0;
Key ** ksArray = 0;
if (test_bit (mode, MODE_STORAGE))
{
ksArray = (Key **) mmapAddr->ksArrayPtr;
}
else
{
ksArray = (Key **) mmapAddr->globalKsArrayPtr;
}
ksRewind (keySet);
while ((cur = ksNext (keySet)) != 0)
{
Key * mmapKey = (Key *) mmapAddr->keyPtr; // new key location
mmapAddr->keyPtr += SIZEOF_KEY;
*mmapKey = *cur;
// move Key name
if (cur->key)
{
memcpy (mmapAddr->dataPtr, cur->key, cur->keySize);
mmapKey->key = mmapAddr->dataPtr - mmapAddr->mmapAddrInt;
mmapAddr->dataPtr += cur->keySize;
mmapKey->flags |= KEY_FLAG_MMAP_KEY;
}
// move Key unescaped name
if (cur->ukey)
{
memcpy (mmapAddr->dataPtr, cur->ukey, cur->keyUSize);
mmapKey->ukey = mmapAddr->dataPtr - mmapAddr->mmapAddrInt;
mmapAddr->dataPtr += cur->keyUSize;
mmapKey->flags |= KEY_FLAG_MMAP_KEY;
}
// move Key value
if (cur->data.v)
{
memcpy (mmapAddr->dataPtr, cur->data.v, cur->dataSize);
mmapKey->data.v = mmapAddr->dataPtr - mmapAddr->mmapAddrInt;
mmapAddr->dataPtr += cur->dataSize;
mmapKey->flags |= KEY_FLAG_MMAP_DATA;
}
else
{
mmapKey->data.v = 0;
mmapKey->dataSize = 0;
}
// write the meta KeySet
mmapKey->meta = writeMetaKeySet (cur, mmapAddr, dynArray);
// move Key itself
mmapKey->flags |= KEY_FLAG_MMAP_STRUCT;
mmapKey->refs = 1;
// write the relative Key pointer into the KeySet array
ksArray[keyIndex] = (Key *) ((char *) mmapKey - mmapAddr->mmapAddrInt);
++keyIndex;
}
}
static void printMmapAddr (MmapAddr * mmapAddr ELEKTRA_UNUSED)
{
ELEKTRA_LOG_DEBUG ("globalKsPtr: \t\t %p", (void *) mmapAddr->globalKsPtr);
ELEKTRA_LOG_DEBUG ("ksPtr: \t\t %p", (void *) mmapAddr->ksPtr);
ELEKTRA_LOG_DEBUG ("metaKsPtr: \t\t %p", (void *) mmapAddr->metaKsPtr);
ELEKTRA_LOG_DEBUG ("globalKsArrayPtr: \t %p", (void *) mmapAddr->globalKsArrayPtr);
ELEKTRA_LOG_DEBUG ("ksArrayPtr: \t\t %p", (void *) mmapAddr->ksArrayPtr);
ELEKTRA_LOG_DEBUG ("metaKsArrayPtr: \t %p", (void *) mmapAddr->metaKsArrayPtr);
ELEKTRA_LOG_DEBUG ("keyPtr: \t\t %p", (void *) mmapAddr->keyPtr);
ELEKTRA_LOG_DEBUG ("dataPtr: \t\t %p", (void *) mmapAddr->dataPtr);
ELEKTRA_LOG_DEBUG ("mmapAddrInt: \t\t %lu", mmapAddr->mmapAddrInt);
}
static void printMmapMetaData (MmapMetaData * mmapMetaData ELEKTRA_UNUSED)
{
ELEKTRA_LOG_DEBUG ("numKeySets: \t %lu", mmapMetaData->numKeySets);
ELEKTRA_LOG_DEBUG ("ksAlloc: \t %lu", mmapMetaData->ksAlloc);
ELEKTRA_LOG_DEBUG ("numKeys: \t %lu", mmapMetaData->numKeys);
}
/**
* @brief Copies a keyset to a mapped region.
*
* Writes a keyset with all needed information to the mapped region and calculates
* the checksum. Everything is written to the mapped region, including keyset, keys,
* meta-information and data for consistency checks.
*
* @param dest address of the mapped region
* @param keySet to copy to the mapped region
* @param global global keyset
* @param mmapHeader containing the size and checksum of the mapped region
* @param mmapMetaData containing meta-information of the mapped region
* @param mmapFooter containing a magic number for consistency checks
* @param dynArray containing deduplicated pointers to meta-keys
* @param mode the current plugin mode
*
* @retval 0 on success
* @retval -1 if msync() failed
*/
static int copyKeySetToMmap (char * const dest, KeySet * keySet, KeySet * global, MmapHeader * mmapHeader, MmapMetaData * mmapMetaData,
MmapFooter * mmapFooter, DynArray * dynArray, PluginMode mode)
{
writeMagicData (dest);
size_t globalAlloc = 0;
if (global) globalAlloc = global->alloc;
MmapAddr mmapAddr = { .globalKsPtr = (KeySet *) (dest + OFFSET_GLOBAL_KEYSET),
.ksPtr = (KeySet *) (dest + OFFSET_KEYSET),
.metaKsPtr = (char *) mmapAddr.ksPtr + SIZEOF_KEYSET,
.globalKsArrayPtr = (dest + OFFSET_GLOBAL_KEYSET) + (SIZEOF_KEYSET * mmapMetaData->numKeySets),
.ksArrayPtr = mmapAddr.globalKsArrayPtr + (SIZEOF_KEY_PTR * globalAlloc),
.metaKsArrayPtr = mmapAddr.ksArrayPtr + (SIZEOF_KEY_PTR * keySet->alloc),
.keyPtr = mmapAddr.globalKsArrayPtr + (SIZEOF_KEY_PTR * mmapMetaData->ksAlloc),
.dataPtr = mmapAddr.keyPtr + (SIZEOF_KEY * mmapMetaData->numKeys),
.mmapAddrInt = (uintptr_t) dest };
printMmapAddr (&mmapAddr);
printMmapMetaData (mmapMetaData);
#ifdef ELEKTRA_ENABLE_OPTIMIZATIONS
// We FIRST write the opmphm data. If this is changed, you'll run into alignment problems.
// set OPMPHM flag, so file is not readable by builds without OPMPHM
set_bit (mmapHeader->formatFlags, MMAP_FLAG_OPMPHM);
if (keySet->opmphm)
{
mmapAddr.ksPtr->opmphm = (Opmphm *) (dest + OFFSET_OPMPHM);
memcpy (mmapAddr.ksPtr->opmphm, keySet->opmphm, sizeof (Opmphm));
mmapAddr.ksPtr->opmphm->flags = OPMPHM_FLAG_MMAP_STRUCT;
if (keySet->opmphm->rUniPar)
{
mmapAddr.ksPtr->opmphm->hashFunctionSeeds = (int32_t *) mmapAddr.dataPtr;
memcpy (mmapAddr.ksPtr->opmphm->hashFunctionSeeds, keySet->opmphm->hashFunctionSeeds,
keySet->opmphm->rUniPar * sizeof (int32_t));
set_bit (mmapAddr.ksPtr->opmphm->flags, OPMPHM_FLAG_MMAP_HASHFUNCTIONSEEDS);
mmapAddr.dataPtr += keySet->opmphm->rUniPar * sizeof (int32_t);
mmapAddr.ksPtr->opmphm->hashFunctionSeeds =
(int32_t *) (((char *) mmapAddr.ksPtr->opmphm->hashFunctionSeeds) - mmapAddr.mmapAddrInt);
}
if (keySet->opmphm->size)
{
mmapAddr.ksPtr->opmphm->graph = (uint32_t *) mmapAddr.dataPtr;
memcpy (mmapAddr.ksPtr->opmphm->graph, keySet->opmphm->graph, keySet->opmphm->size);
set_bit (mmapAddr.ksPtr->opmphm->flags, OPMPHM_FLAG_MMAP_GRAPH);
mmapAddr.dataPtr += keySet->opmphm->size;
mmapAddr.ksPtr->opmphm->graph = (uint32_t *) (((char *) mmapAddr.ksPtr->opmphm->graph) - mmapAddr.mmapAddrInt);
}
mmapAddr.ksPtr->opmphm = (Opmphm *) (((char *) mmapAddr.ksPtr->opmphm) - mmapAddr.mmapAddrInt);
}
if (keySet->opmphmPredictor)
{