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Data Structures | Typedefs | Enumerations | Functions
filemap.h File Reference
#include "datapagemap.h"
#include "storage/block.h"
#include "storage/relfilelocator.h"
Include dependency graph for filemap.h:
This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures

struct   file_entry_t
 
struct   filemap_t
 

Typedefs

typedef struct file_entry_t  file_entry_t
 
typedef struct filemap_t  filemap_t
 

Enumerations

enum   file_action_t {
  FILE_ACTION_UNDECIDED = 0 , FILE_ACTION_CREATE , FILE_ACTION_COPY , FILE_ACTION_COPY_TAIL ,
  FILE_ACTION_NONE , FILE_ACTION_TRUNCATE , FILE_ACTION_REMOVE
}
 
enum   file_type_t { FILE_TYPE_UNDEFINED = 0 , FILE_TYPE_REGULAR , FILE_TYPE_DIRECTORY , FILE_TYPE_SYMLINK }
 

Functions

void  filehash_init (void)
 
void  process_source_file (const char *path, file_type_t type, size_t size, const char *link_target)
 
void  process_target_file (const char *path, file_type_t type, size_t size, const char *link_target)
 
void  process_target_wal_block_change (ForkNumber forknum, RelFileLocator rlocator, BlockNumber blkno)
 
filemap_t *  decide_file_actions (void)
 
void  calculate_totals (filemap_t *filemap)
 
void  print_filemap (filemap_t *filemap)
 
void  keepwal_init (void)
 
void  keepwal_add_entry (const char *path)
 

Typedef Documentation

◆ file_entry_t

typedef struct file_entry_t file_entry_t

◆ filemap_t

typedef struct filemap_t filemap_t

Enumeration Type Documentation

◆ file_action_t

enum file_action_t
Enumerator
FILE_ACTION_UNDECIDED 
FILE_ACTION_CREATE 
FILE_ACTION_COPY 
FILE_ACTION_COPY_TAIL 
FILE_ACTION_NONE 
FILE_ACTION_TRUNCATE 
FILE_ACTION_REMOVE 

Definition at line 16 of file filemap.h.

17{
18 FILE_ACTION_UNDECIDED = 0, /* not decided yet */
19
20 FILE_ACTION_CREATE, /* create local directory or symbolic link */
21 FILE_ACTION_COPY, /* copy whole file, overwriting if exists */
22 FILE_ACTION_COPY_TAIL, /* copy tail from 'source_size' to
23 * 'target_size' */
24 FILE_ACTION_NONE, /* no action (we might still copy modified
25 * blocks based on the parsed WAL) */
26 FILE_ACTION_TRUNCATE, /* truncate local file to 'newsize' bytes */
27 FILE_ACTION_REMOVE, /* remove local file / directory / symlink */
file_action_t
Definition: filemap.h:17
@ FILE_ACTION_REMOVE
Definition: filemap.h:27
@ FILE_ACTION_COPY
Definition: filemap.h:21
@ FILE_ACTION_NONE
Definition: filemap.h:24
@ FILE_ACTION_COPY_TAIL
Definition: filemap.h:22
@ FILE_ACTION_UNDECIDED
Definition: filemap.h:18
@ FILE_ACTION_TRUNCATE
Definition: filemap.h:26
@ FILE_ACTION_CREATE
Definition: filemap.h:20

◆ file_type_t

enum file_type_t
Enumerator
FILE_TYPE_UNDEFINED 
FILE_TYPE_REGULAR 
FILE_TYPE_DIRECTORY 
FILE_TYPE_SYMLINK 

Definition at line 30 of file filemap.h.

31{
33
file_type_t
Definition: filemap.h:31
@ FILE_TYPE_UNDEFINED
Definition: filemap.h:32
@ FILE_TYPE_REGULAR
Definition: filemap.h:34
@ FILE_TYPE_SYMLINK
Definition: filemap.h:36
@ FILE_TYPE_DIRECTORY
Definition: filemap.h:35

Function Documentation

◆ calculate_totals()

void calculate_totals ( filemap_t *  filemap )

Definition at line 500 of file filemap.c.

501{
502 file_entry_t *entry;
503 int i;
504
505 filemap->total_size = 0;
506 filemap->fetch_size = 0;
507
508 for (i = 0; i < filemap->nentries; i++)
509 {
510 entry = filemap->entries[i];
511
512 if (entry->source_type != FILE_TYPE_REGULAR)
513 continue;
514
515 filemap->total_size += entry->source_size;
516
517 if (entry->action == FILE_ACTION_COPY)
518 {
519 filemap->fetch_size += entry->source_size;
520 continue;
521 }
522
523 if (entry->action == FILE_ACTION_COPY_TAIL)
524 filemap->fetch_size += (entry->source_size - entry->target_size);
525
527 {
529 BlockNumber blk;
530
532 while (datapagemap_next(iter, &blk))
533 filemap->fetch_size += BLCKSZ;
534
535 pg_free(iter);
536 }
537 }
538}
uint32 BlockNumber
Definition: block.h:31
bool datapagemap_next(datapagemap_iterator_t *iter, BlockNumber *blkno)
Definition: datapagemap.c:87
datapagemap_iterator_t * datapagemap_iterate(datapagemap_t *map)
Definition: datapagemap.c:75
void pg_free(void *ptr)
Definition: fe_memutils.c:105
i
int i
Definition: isn.c:77
Definition: datapagemap.c:19
int bitmapsize
Definition: datapagemap.h:17
Definition: filemap.h:50
datapagemap_t target_pages_to_overwrite
Definition: filemap.h:68
size_t source_size
Definition: filemap.h:75
file_type_t source_type
Definition: filemap.h:74
size_t target_size
Definition: filemap.h:61
file_action_t action
Definition: filemap.h:81
file_entry_t * entries[FLEXIBLE_ARRAY_MEMBER]
Definition: filemap.h:96
int nentries
Definition: filemap.h:95
uint64 total_size
Definition: filemap.h:92
uint64 fetch_size
Definition: filemap.h:93

References file_entry_t::action, datapagemap::bitmapsize, datapagemap_iterate(), datapagemap_next(), filemap_t::entries, filemap_t::fetch_size, FILE_ACTION_COPY, FILE_ACTION_COPY_TAIL, FILE_TYPE_REGULAR, i, filemap_t::nentries, pg_free(), file_entry_t::source_size, file_entry_t::source_type, file_entry_t::target_pages_to_overwrite, file_entry_t::target_size, and filemap_t::total_size.

Referenced by main().

◆ decide_file_actions()

filemap_t * decide_file_actions ( void  )

Definition at line 861 of file filemap.c.

862{
863 int i;
864 filehash_iterator it;
865 file_entry_t *entry;
866 filemap_t *filemap;
867
868 filehash_start_iterate(filehash, &it);
869 while ((entry = filehash_iterate(filehash, &it)) != NULL)
870 {
871 entry->action = decide_file_action(entry);
872 }
873
874 /*
875 * Turn the hash table into an array, and sort in the order that the
876 * actions should be performed.
877 */
878 filemap = pg_malloc(offsetof(filemap_t, entries) +
879 filehash->members * sizeof(file_entry_t *));
880 filemap->nentries = filehash->members;
881 filehash_start_iterate(filehash, &it);
882 i = 0;
883 while ((entry = filehash_iterate(filehash, &it)) != NULL)
884 {
885 filemap->entries[i++] = entry;
886 }
887
888 qsort(&filemap->entries, filemap->nentries, sizeof(file_entry_t *),
890
891 return filemap;
892}
void * pg_malloc(size_t size)
Definition: fe_memutils.c:47
static filehash_hash * filehash
Definition: filemap.c:56
static file_action_t decide_file_action(file_entry_t *entry)
Definition: filemap.c:700
static int final_filemap_cmp(const void *a, const void *b)
Definition: filemap.c:680
#define qsort(a, b, c, d)
Definition: port.h:479
Definition: filemap.h:90

References file_entry_t::action, decide_file_action(), filemap_t::entries, filehash, final_filemap_cmp(), i, filemap_t::nentries, pg_malloc(), and qsort.

Referenced by main().

◆ filehash_init()

void filehash_init ( void  )

Definition at line 197 of file filemap.c.

198{
199 filehash = filehash_create(FILEHASH_INITIAL_SIZE, NULL);
200}
#define FILEHASH_INITIAL_SIZE
Definition: filemap.c:54

References filehash, and FILEHASH_INITIAL_SIZE.

Referenced by main().

◆ keepwal_add_entry()

void keepwal_add_entry ( const char *  path )

Definition at line 251 of file filemap.c.

252{
253 keepwal_entry *entry;
254 bool found;
255
256 /* Should only be called with keepwal initialized */
257 Assert(keepwal != NULL);
258
259 entry = keepwal_insert(keepwal, path, &found);
260
261 if (!found)
262 entry->path = pg_strdup(path);
263}
char * pg_strdup(const char *in)
Definition: fe_memutils.c:85
static keepwal_hash * keepwal
Definition: filemap.c:89
Assert(PointerIsAligned(start, uint64))
Definition: filemap.c:69
const char * path
Definition: filemap.c:70

References Assert(), keepwal, keepwal_entry::path, and pg_strdup().

Referenced by findLastCheckpoint().

◆ keepwal_init()

void keepwal_init ( void  )

Definition at line 243 of file filemap.c.

244{
245 /* An initial hash size out of thin air */
246 keepwal = keepwal_create(KEEPWAL_INITIAL_SIZE, NULL);
247}
#define KEEPWAL_INITIAL_SIZE
Definition: filemap.c:86

References keepwal, and KEEPWAL_INITIAL_SIZE.

Referenced by main().

◆ print_filemap()

void print_filemap ( filemap_t *  filemap )

Definition at line 541 of file filemap.c.

542{
543 file_entry_t *entry;
544 int i;
545
546 for (i = 0; i < filemap->nentries; i++)
547 {
548 entry = filemap->entries[i];
549 if (entry->action != FILE_ACTION_NONE ||
551 {
552 pg_log_debug("%s (%s)", entry->path,
553 action_to_str(entry->action));
554
557 }
558 }
559 fflush(stdout);
560}
void datapagemap_print(datapagemap_t *map)
Definition: datapagemap.c:117
static const char * action_to_str(file_action_t action)
Definition: filemap.c:474
#define pg_log_debug(...)
Definition: logging.h:133
stdout
const char * path
Definition: filemap.h:53

References file_entry_t::action, action_to_str(), datapagemap::bitmapsize, datapagemap_print(), filemap_t::entries, FILE_ACTION_NONE, i, filemap_t::nentries, file_entry_t::path, pg_log_debug, generate_unaccent_rules::stdout, and file_entry_t::target_pages_to_overwrite.

Referenced by main().

◆ process_source_file()

void process_source_file ( const char *  path,
file_type_t  type,
size_t  size,
const char *  link_target 
)

Definition at line 280 of file filemap.c.

282{
283 file_entry_t *entry;
284
285 /*
286 * Pretend that pg_wal is a directory, even if it's really a symlink. We
287 * don't want to mess with the symlink itself, nor complain if it's a
288 * symlink in source but not in target or vice versa.
289 */
290 if (strcmp(path, "pg_wal") == 0 && type == FILE_TYPE_SYMLINK)
292
293 /*
294 * sanity check: a filename that looks like a data file better be a
295 * regular file
296 */
297 if (type != FILE_TYPE_REGULAR && isRelDataFile(path))
298 pg_fatal("data file \"%s\" in source is not a regular file", path);
299
300 /* Remember this source file */
301 entry = insert_filehash_entry(path);
302 if (entry->source_exists)
303 pg_fatal("duplicate source file \"%s\"", path);
304 entry->source_exists = true;
305 entry->source_type = type;
306 entry->source_size = size;
307 entry->source_link_target = link_target ? pg_strdup(link_target) : NULL;
308}
static bool isRelDataFile(const char *path)
Definition: filemap.c:571
static file_entry_t * insert_filehash_entry(const char *path)
Definition: filemap.c:204
#define pg_fatal(...)
bool source_exists
Definition: filemap.h:73
char * source_link_target
Definition: filemap.h:76
const char * type

References FILE_TYPE_DIRECTORY, FILE_TYPE_REGULAR, FILE_TYPE_SYMLINK, insert_filehash_entry(), isRelDataFile(), pg_fatal, pg_strdup(), file_entry_t::source_exists, file_entry_t::source_link_target, file_entry_t::source_size, file_entry_t::source_type, and type.

Referenced by main().

◆ process_target_file()

void process_target_file ( const char *  path,
file_type_t  type,
size_t  size,
const char *  link_target 
)

Definition at line 316 of file filemap.c.

318{
319 file_entry_t *entry;
320
321 /*
322 * Do not apply any exclusion filters here. This has advantage to remove
323 * from the target data folder all paths which have been filtered out from
324 * the source data folder when processing the source files.
325 */
326
327 /*
328 * Like in process_source_file, pretend that pg_wal is always a directory.
329 */
330 if (strcmp(path, "pg_wal") == 0 && type == FILE_TYPE_SYMLINK)
332
333 /* Remember this target file */
334 entry = insert_filehash_entry(path);
335 if (entry->target_exists)
336 pg_fatal("duplicate source file \"%s\"", path);
337 entry->target_exists = true;
338 entry->target_type = type;
339 entry->target_size = size;
340 entry->target_link_target = link_target ? pg_strdup(link_target) : NULL;
341}
bool target_exists
Definition: filemap.h:59
char * target_link_target
Definition: filemap.h:62
file_type_t target_type
Definition: filemap.h:60

References FILE_TYPE_DIRECTORY, FILE_TYPE_SYMLINK, insert_filehash_entry(), pg_fatal, pg_strdup(), file_entry_t::target_exists, file_entry_t::target_link_target, file_entry_t::target_size, file_entry_t::target_type, and type.

Referenced by main().

◆ process_target_wal_block_change()

void process_target_wal_block_change ( ForkNumber  forknum,
RelFileLocator  rlocator,
BlockNumber  blkno 
)

Definition at line 353 of file filemap.c.

355{
356 char *path;
357 file_entry_t *entry;
358 BlockNumber blkno_inseg;
359 int segno;
360
361 segno = blkno / RELSEG_SIZE;
362 blkno_inseg = blkno % RELSEG_SIZE;
363
364 path = datasegpath(rlocator, forknum, segno);
365 entry = lookup_filehash_entry(path);
366 pfree(path);
367
368 /*
369 * If the block still exists in both systems, remember it. Otherwise we
370 * can safely ignore it.
371 *
372 * If the block is beyond the EOF in the source system, or the file
373 * doesn't exist in the source at all, we're going to truncate/remove it
374 * away from the target anyway. Likewise, if it doesn't exist in the
375 * target anymore, we will copy it over with the "tail" from the source
376 * system, anyway.
377 *
378 * It is possible to find WAL for a file that doesn't exist on either
379 * system anymore. It means that the relation was dropped later in the
380 * target system, and independently on the source system too, or that it
381 * was created and dropped in the target system and it never existed in
382 * the source. Either way, we can safely ignore it.
383 */
384 if (entry)
385 {
386 Assert(entry->isrelfile);
387
388 if (entry->target_exists)
389 {
390 if (entry->target_type != FILE_TYPE_REGULAR)
391 pg_fatal("unexpected page modification for non-regular file \"%s\"",
392 entry->path);
393
394 if (entry->source_exists)
395 {
396 off_t end_offset;
397
398 end_offset = (blkno_inseg + 1) * BLCKSZ;
399 if (end_offset <= entry->source_size && end_offset <= entry->target_size)
400 datapagemap_add(&entry->target_pages_to_overwrite, blkno_inseg);
401 }
402 }
403 }
404}
void datapagemap_add(datapagemap_t *map, BlockNumber blkno)
Definition: datapagemap.c:32
static char * datasegpath(RelFileLocator rlocator, ForkNumber forknum, BlockNumber segno)
Definition: filemap.c:654
static file_entry_t * lookup_filehash_entry(const char *path)
Definition: filemap.c:234
void pfree(void *pointer)
Definition: mcxt.c:1594
bool isrelfile
Definition: filemap.h:54

References Assert(), datapagemap_add(), datasegpath(), FILE_TYPE_REGULAR, file_entry_t::isrelfile, lookup_filehash_entry(), file_entry_t::path, pfree(), pg_fatal, file_entry_t::source_exists, file_entry_t::target_exists, file_entry_t::target_pages_to_overwrite, and file_entry_t::target_type.

Referenced by extractPageInfo().

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