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relfilenode.c
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1 /*
2  * relfilenode.c
3  *
4  * relfilenode functions
5  *
6  * Copyright (c) 2010-2019, PostgreSQL Global Development Group
7  * src/bin/pg_upgrade/relfilenode.c
8  */
9 
10 #include "postgres_fe.h"
11 
12 #include <sys/stat.h>
13 
14 #include "access/transam.h"
15 #include "catalog/pg_class_d.h"
16 #include "pg_upgrade.h"
17 
18 static void transfer_single_new_db(FileNameMap *maps, int size, char *old_tablespace);
19 static void transfer_relfile(FileNameMap *map, const char *suffix, bool vm_must_add_frozenbit);
20 
21 
22 /*
23  * transfer_all_new_tablespaces()
24  *
25  * Responsible for upgrading all database. invokes routines to generate mappings and then
26  * physically link the databases.
27  */
28 void
30  char *old_pgdata, char *new_pgdata)
31 {
32  switch (user_opts.transfer_mode)
33  {
35  pg_log(PG_REPORT, "Cloning user relation files\n");
36  break;
37  case TRANSFER_MODE_COPY:
38  pg_log(PG_REPORT, "Copying user relation files\n");
39  break;
40  case TRANSFER_MODE_LINK:
41  pg_log(PG_REPORT, "Linking user relation files\n");
42  break;
43  }
44 
45  /*
46  * Transferring files by tablespace is tricky because a single database
47  * can use multiple tablespaces. For non-parallel mode, we just pass a
48  * NULL tablespace path, which matches all tablespaces. In parallel mode,
49  * we pass the default tablespace and all user-created tablespaces and let
50  * those operations happen in parallel.
51  */
52  if (user_opts.jobs <= 1)
53  parallel_transfer_all_new_dbs(old_db_arr, new_db_arr, old_pgdata,
54  new_pgdata, NULL);
55  else
56  {
57  int tblnum;
58 
59  /* transfer default tablespace */
60  parallel_transfer_all_new_dbs(old_db_arr, new_db_arr, old_pgdata,
61  new_pgdata, old_pgdata);
62 
63  for (tblnum = 0; tblnum < os_info.num_old_tablespaces; tblnum++)
65  new_db_arr,
66  old_pgdata,
67  new_pgdata,
68  os_info.old_tablespaces[tblnum]);
69  /* reap all children */
70  while (reap_child(true) == true)
71  ;
72  }
73 
75  check_ok();
76 }
77 
78 
79 /*
80  * transfer_all_new_dbs()
81  *
82  * Responsible for upgrading all database. invokes routines to generate mappings and then
83  * physically link the databases.
84  */
85 void
86 transfer_all_new_dbs(DbInfoArr *old_db_arr, DbInfoArr *new_db_arr,
87  char *old_pgdata, char *new_pgdata, char *old_tablespace)
88 {
89  int old_dbnum,
90  new_dbnum;
91 
92  /* Scan the old cluster databases and transfer their files */
93  for (old_dbnum = new_dbnum = 0;
94  old_dbnum < old_db_arr->ndbs;
95  old_dbnum++, new_dbnum++)
96  {
97  DbInfo *old_db = &old_db_arr->dbs[old_dbnum],
98  *new_db = NULL;
99  FileNameMap *mappings;
100  int n_maps;
101 
102  /*
103  * Advance past any databases that exist in the new cluster but not in
104  * the old, e.g. "postgres". (The user might have removed the
105  * 'postgres' database from the old cluster.)
106  */
107  for (; new_dbnum < new_db_arr->ndbs; new_dbnum++)
108  {
109  new_db = &new_db_arr->dbs[new_dbnum];
110  if (strcmp(old_db->db_name, new_db->db_name) == 0)
111  break;
112  }
113 
114  if (new_dbnum >= new_db_arr->ndbs)
115  pg_fatal("old database \"%s\" not found in the new cluster\n",
116  old_db->db_name);
117 
118  mappings = gen_db_file_maps(old_db, new_db, &n_maps, old_pgdata,
119  new_pgdata);
120  if (n_maps)
121  {
122  print_maps(mappings, n_maps, new_db->db_name);
123 
124  transfer_single_new_db(mappings, n_maps, old_tablespace);
125  }
126  /* We allocate something even for n_maps == 0 */
127  pg_free(mappings);
128  }
129 }
130 
131 /*
132  * transfer_single_new_db()
133  *
134  * create links for mappings stored in "maps" array.
135  */
136 static void
137 transfer_single_new_db(FileNameMap *maps, int size, char *old_tablespace)
138 {
139  int mapnum;
140  bool vm_crashsafe_match = true;
141  bool vm_must_add_frozenbit = false;
142 
143  /*
144  * Do the old and new cluster disagree on the crash-safetiness of the vm
145  * files? If so, do not copy them.
146  */
149  vm_crashsafe_match = false;
150 
151  /*
152  * Do we need to rewrite visibilitymap?
153  */
156  vm_must_add_frozenbit = true;
157 
158  for (mapnum = 0; mapnum < size; mapnum++)
159  {
160  if (old_tablespace == NULL ||
161  strcmp(maps[mapnum].old_tablespace, old_tablespace) == 0)
162  {
163  /* transfer primary file */
164  transfer_relfile(&maps[mapnum], "", vm_must_add_frozenbit);
165 
166  /* fsm/vm files added in PG 8.4 */
168  {
169  /*
170  * Copy/link any fsm and vm files, if they exist
171  */
172  transfer_relfile(&maps[mapnum], "_fsm", vm_must_add_frozenbit);
173  if (vm_crashsafe_match)
174  transfer_relfile(&maps[mapnum], "_vm", vm_must_add_frozenbit);
175  }
176  }
177  }
178 }
179 
180 
181 /*
182  * transfer_relfile()
183  *
184  * Copy or link file from old cluster to new one. If vm_must_add_frozenbit
185  * is true, visibility map forks are converted and rewritten, even in link
186  * mode.
187  */
188 static void
189 transfer_relfile(FileNameMap *map, const char *type_suffix, bool vm_must_add_frozenbit)
190 {
191  char old_file[MAXPGPATH];
192  char new_file[MAXPGPATH];
193  int segno;
194  char extent_suffix[65];
195  struct stat statbuf;
196 
197  /*
198  * Now copy/link any related segments as well. Remember, PG breaks large
199  * files into 1GB segments, the first segment has no extension, subsequent
200  * segments are named relfilenode.1, relfilenode.2, relfilenode.3.
201  */
202  for (segno = 0;; segno++)
203  {
204  if (segno == 0)
205  extent_suffix[0] = '\0';
206  else
207  snprintf(extent_suffix, sizeof(extent_suffix), ".%d", segno);
208 
209  snprintf(old_file, sizeof(old_file), "%s%s/%u/%u%s%s",
210  map->old_tablespace,
212  map->old_db_oid,
213  map->old_relfilenode,
214  type_suffix,
215  extent_suffix);
216  snprintf(new_file, sizeof(new_file), "%s%s/%u/%u%s%s",
217  map->new_tablespace,
219  map->new_db_oid,
220  map->new_relfilenode,
221  type_suffix,
222  extent_suffix);
223 
224  /* Is it an extent, fsm, or vm file? */
225  if (type_suffix[0] != '\0' || segno != 0)
226  {
227  /* Did file open fail? */
228  if (stat(old_file, &statbuf) != 0)
229  {
230  /* File does not exist? That's OK, just return */
231  if (errno == ENOENT)
232  return;
233  else
234  pg_fatal("error while checking for file existence \"%s.%s\" (\"%s\" to \"%s\"): %s\n",
235  map->nspname, map->relname, old_file, new_file,
236  strerror(errno));
237  }
238 
239  /* If file is empty, just return */
240  if (statbuf.st_size == 0)
241  return;
242  }
243 
244  unlink(new_file);
245 
246  /* Copying files might take some time, so give feedback. */
247  pg_log(PG_STATUS, "%s", old_file);
248 
249  if (vm_must_add_frozenbit && strcmp(type_suffix, "_vm") == 0)
250  {
251  /* Need to rewrite visibility map format */
252  pg_log(PG_VERBOSE, "rewriting \"%s\" to \"%s\"\n",
253  old_file, new_file);
254  rewriteVisibilityMap(old_file, new_file, map->nspname, map->relname);
255  }
256  else
257  switch (user_opts.transfer_mode)
258  {
259  case TRANSFER_MODE_CLONE:
260  pg_log(PG_VERBOSE, "cloning \"%s\" to \"%s\"\n",
261  old_file, new_file);
262  cloneFile(old_file, new_file, map->nspname, map->relname);
263  break;
264  case TRANSFER_MODE_COPY:
265  pg_log(PG_VERBOSE, "copying \"%s\" to \"%s\"\n",
266  old_file, new_file);
267  copyFile(old_file, new_file, map->nspname, map->relname);
268  break;
269  case TRANSFER_MODE_LINK:
270  pg_log(PG_VERBOSE, "linking \"%s\" to \"%s\"\n",
271  old_file, new_file);
272  linkFile(old_file, new_file, map->nspname, map->relname);
273  }
274  }
275 }
void cloneFile(const char *src, const char *dst, const char *schemaName, const char *relName)
Definition: file.c:42
Oid old_relfilenode
Definition: pg_upgrade.h:168
uint32 major_version
Definition: pg_upgrade.h:269
#define VISIBILITY_MAP_CRASHSAFE_CAT_VER
Definition: pg_upgrade.h:102
ControlData controldata
Definition: pg_upgrade.h:259
void rewriteVisibilityMap(const char *fromfile, const char *tofile, const char *schemaName, const char *relName)
Definition: file.c:177
#define GET_MAJOR_VERSION(v)
Definition: pg_upgrade.h:23
void end_progress_output(void)
Definition: util.c:43
FileNameMap * gen_db_file_maps(DbInfo *old_db, DbInfo *new_db, int *nmaps, const char *old_pgdata, const char *new_pgdata)
Definition: info.c:39
#define pg_fatal(...)
Definition: pg_rewind.h:41
Oid new_db_oid
Definition: pg_upgrade.h:162
int jobs
Definition: pg_upgrade.h:295
void copyFile(const char *src, const char *dst, const char *schemaName, const char *relName)
Definition: file.c:82
ClusterInfo new_cluster
Definition: pg_upgrade.c:59
void transfer_all_new_dbs(DbInfoArr *old_db_arr, DbInfoArr *new_db_arr, char *old_pgdata, char *new_pgdata, char *old_tablespace)
Definition: relfilenode.c:86
void print_maps(FileNameMap *maps, int n_maps, const char *db_name)
Definition: info.c:283
const char * old_tablespace
Definition: pg_upgrade.h:157
Oid new_relfilenode
Definition: pg_upgrade.h:169
#define MAXPGPATH
void parallel_transfer_all_new_dbs(DbInfoArr *old_db_arr, DbInfoArr *new_db_arr, char *old_pgdata, char *new_pgdata, char *old_tablespace)
Definition: parallel.c:175
void linkFile(const char *src, const char *dst, const char *schemaName, const char *relName)
Definition: file.c:151
ClusterInfo old_cluster
Definition: pg_upgrade.c:59
static void check_ok(void)
Definition: initdb.c:2076
const char * old_tablespace_suffix
Definition: pg_upgrade.h:159
transferMode transfer_mode
Definition: pg_upgrade.h:294
UserOpts user_opts
Definition: option.c:30
static void transfer_relfile(FileNameMap *map, const char *suffix, bool vm_must_add_frozenbit)
Definition: relfilenode.c:189
#define stat(a, b)
Definition: win32_port.h:255
#define VISIBILITY_MAP_FROZEN_BIT_CAT_VER
Definition: pg_upgrade.h:107
uint32 cat_ver
Definition: pg_upgrade.h:204
char ** old_tablespaces
Definition: pg_upgrade.h:313
void void pg_log(eLogType type, const char *fmt,...) pg_attribute_printf(2
Oid old_db_oid
Definition: pg_upgrade.h:161
static const pg_conv_map maps[]
#define strerror
Definition: port.h:205
void pg_free(void *ptr)
Definition: fe_memutils.c:105
bool reap_child(bool wait_for_child)
Definition: parallel.c:284
char * nspname
Definition: pg_upgrade.h:171
void transfer_all_new_tablespaces(DbInfoArr *old_db_arr, DbInfoArr *new_db_arr, char *old_pgdata, char *new_pgdata)
Definition: relfilenode.c:29
int num_old_tablespaces
Definition: pg_upgrade.h:314
OSInfo os_info
Definition: pg_upgrade.c:61
char * db_name
Definition: pg_upgrade.h:181
DbInfo * dbs
Definition: pg_upgrade.h:192
#define snprintf
Definition: port.h:192
const char * new_tablespace
Definition: pg_upgrade.h:158
const char * new_tablespace_suffix
Definition: pg_upgrade.h:160
char * relname
Definition: pg_upgrade.h:172
static void transfer_single_new_db(FileNameMap *maps, int size, char *old_tablespace)
Definition: relfilenode.c:137