* To support file access via the information given in RelFileNode, we
* maintain a symbolic-link map in $PGDATA/pg_tblspc. The symlinks are
* named by tablespace OIDs and point to the actual tablespace directories.
+ * There is also a per-cluster version directory in each tablespace.
* Thus the full path to an arbitrary file is
- * $PGDATA/pg_tblspc/spcoid/dboid/relfilenode
+ * $PGDATA/pg_tblspc/spcoid/PG_MAJORVER_CATVER/dboid/relfilenode
+ * e.g.
+ * $PGDATA/pg_tblspc/20981/PG_8.5_201001061/719849/83292814
*
* There are two tablespaces created at initdb time: pg_global (for shared
* tables) and pg_default (for everything else). For backwards compatibility
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/commands/tablespace.c,v 1.70 2010/01/07 04:10:39 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/commands/tablespace.c,v 1.71 2010/01/12 02:42:51 momjian Exp $
*
*-------------------------------------------------------------------------
*/
char *temp_tablespaces = NULL;
-static bool remove_tablespace_directories(Oid tablespaceoid, bool redo);
-static void write_version_file(const char *path);
+static void create_tablespace_directories(const char *location,
+ const Oid tablespaceoid);
+static bool destroy_tablespace_directories(Oid tablespaceoid, bool redo);
/*
{
char *parentdir;
- /* Failure other than not exists? */
+ /* Failure other than not exists or not in WAL replay? */
if (errno != ENOENT || !isRedo)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not create directory \"%s\": %m",
dir)));
- /* Parent directory must be missing */
+ /*
+ * Parent directories are missing during WAL replay, so
+ * continue by creating simple parent directories
+ * rather than a symlink.
+ */
+
+ /* create two parents up if not exist */
parentdir = pstrdup(dir);
get_parent_directory(parentdir);
- /* Can't create parent either? */
- if (mkdir(parentdir, S_IRWXU) < 0)
+ get_parent_directory(parentdir);
+ /* Can't create parent and it doesn't already exist? */
+ if (mkdir(parentdir, S_IRWXU) < 0 && errno != EEXIST)
+ ereport(ERROR,
+ (errcode_for_file_access(),
+ errmsg("could not create directory \"%s\": %m",
+ parentdir)));
+ pfree(parentdir);
+
+ /* create one parent up if not exist */
+ parentdir = pstrdup(dir);
+ get_parent_directory(parentdir);
+ /* Can't create parent and it doesn't already exist? */
+ if (mkdir(parentdir, S_IRWXU) < 0 && errno != EEXIST)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not create directory \"%s\": %m",
HeapTuple tuple;
Oid tablespaceoid;
char *location;
- char *linkloc;
Oid ownerId;
/* Must be super user */
/*
* Check that location isn't too long. Remember that we're going to append
- * '/<dboid>/<relid>.<nnn>' (XXX but do we ever form the whole path
- * explicitly? This may be overly conservative.)
+ * 'PG_XXX/<dboid>/<relid>.<nnn>'. FYI, we never actually reference the
+ * whole path, but mkdir() uses the first two parts.
*/
- if (strlen(location) >= MAXPGPATH - 1 - OIDCHARS - 1 - OIDCHARS - 1 - OIDCHARS)
+ if (strlen(location) + 1 + strlen(TABLESPACE_VERSION_DIRECTORY) + 1 +
+ OIDCHARS + 1 + OIDCHARS + 1 + OIDCHARS > MAXPGPATH)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("tablespace location \"%s\" is too long",
/* Record dependency on owner */
recordDependencyOnOwner(TableSpaceRelationId, tablespaceoid, ownerId);
- /*
- * Attempt to coerce target directory to safe permissions. If this fails,
- * it doesn't exist or has the wrong owner.
- */
- if (chmod(location, 0700) != 0)
- ereport(ERROR,
- (errcode_for_file_access(),
- errmsg("could not set permissions on directory \"%s\": %m",
- location)));
-
- /*
- * Check the target directory is empty.
- */
- if (!directory_is_empty(location))
- ereport(ERROR,
- (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
- errmsg("directory \"%s\" is not empty",
- location)));
-
- /*
- * Create the PG_VERSION file in the target directory. This has several
- * purposes: to make sure we can write in the directory, to prevent
- * someone from creating another tablespace pointing at the same directory
- * (the emptiness check above will fail), and to label tablespace
- * directories by PG version.
- */
- write_version_file(location);
-
- /*
- * All seems well, create the symlink
- */
- linkloc = (char *) palloc(OIDCHARS + OIDCHARS + 1);
- sprintf(linkloc, "pg_tblspc/%u", tablespaceoid);
-
- if (symlink(location, linkloc) < 0)
- ereport(ERROR,
- (errcode_for_file_access(),
- errmsg("could not create symbolic link \"%s\": %m",
- linkloc)));
+ create_tablespace_directories(location, tablespaceoid);
/* Record the filesystem change in XLOG */
{
*/
ForceSyncCommit();
- pfree(linkloc);
pfree(location);
/* We keep the lock on pg_tablespace until commit */
/*
* Try to remove the physical infrastructure.
*/
- if (!remove_tablespace_directories(tablespaceoid, false))
+ if (!destroy_tablespace_directories(tablespaceoid, false))
{
/*
* Not all files deleted? However, there can be lingering empty files
* out any lingering files, and try again.
*/
RequestCheckpoint(CHECKPOINT_IMMEDIATE | CHECKPOINT_FORCE | CHECKPOINT_WAIT);
- if (!remove_tablespace_directories(tablespaceoid, false))
+ if (!destroy_tablespace_directories(tablespaceoid, false))
{
/* Still not empty, the files must be important then */
ereport(ERROR,
#endif /* HAVE_SYMLINK */
}
+
/*
- * remove_tablespace_directories: attempt to remove filesystem infrastructure
+ * create_tablespace_directories
*
- * Returns TRUE if successful, FALSE if some subdirectory is not empty
+ * Attempt to create filesystem infrastructure linking $PGDATA/pg_tblspc/
+ * to the specified directory
+ */
+static void
+create_tablespace_directories(const char *location, const Oid tablespaceoid)
+{
+ char *linkloc = palloc(OIDCHARS + OIDCHARS + 1);
+ char *location_with_version_dir = palloc(strlen(location) + 1 +
+ strlen(TABLESPACE_VERSION_DIRECTORY) + 1);
+
+ sprintf(linkloc, "pg_tblspc/%u", tablespaceoid);
+ sprintf(location_with_version_dir, "%s/%s", location,
+ TABLESPACE_VERSION_DIRECTORY);
+
+ /*
+ * Attempt to coerce target directory to safe permissions. If this fails,
+ * it doesn't exist or has the wrong owner.
+ */
+ if (chmod(location, 0700) != 0)
+ {
+ if (errno == ENOENT)
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FILE),
+ errmsg("directory \"%s\" does not exist",
+ location)));
+ else
+ ereport(ERROR,
+ (errcode_for_file_access(),
+ errmsg("could not set permissions on directory \"%s\": %m",
+ location)));
+ }
+
+ /*
+ * The creation of the version directory prevents more than one
+ * tablespace in a single location.
+ */
+ if (mkdir(location_with_version_dir, S_IRWXU) < 0)
+ {
+ if (errno == EEXIST)
+ ereport(ERROR,
+ (errcode(ERRCODE_OBJECT_IN_USE),
+ errmsg("directory \"%s\" already in use as a tablespace",
+ location_with_version_dir)));
+ else
+ ereport(ERROR,
+ (errcode_for_file_access(),
+ errmsg("could not create directory \"%s\": %m",
+ location_with_version_dir)));
+ }
+
+ /*
+ * Create the symlink under PGDATA
+ */
+ if (symlink(location, linkloc) < 0)
+ ereport(ERROR,
+ (errcode_for_file_access(),
+ errmsg("could not create symbolic link \"%s\": %m",
+ linkloc)));
+
+ pfree(linkloc);
+ pfree(location_with_version_dir);
+}
+
+
+/*
+ * destroy_tablespace_directories
+ *
+ * Attempt to remove filesystem infrastructure
+ *
+ * 'redo' indicates we are redoing a drop from XLOG; okay if nothing there
*
- * redo indicates we are redoing a drop from XLOG; okay if nothing there
+ * Returns TRUE if successful, FALSE if some subdirectory is not empty
*/
static bool
-remove_tablespace_directories(Oid tablespaceoid, bool redo)
+destroy_tablespace_directories(Oid tablespaceoid, bool redo)
{
- char *location;
+ char *linkloc;
+ char *linkloc_with_version_dir;
DIR *dirdesc;
struct dirent *de;
char *subfile;
struct stat st;
- location = (char *) palloc(OIDCHARS + OIDCHARS + 1);
- sprintf(location, "pg_tblspc/%u", tablespaceoid);
+ linkloc_with_version_dir = palloc(9 + 1 + OIDCHARS + 1 +
+ strlen(TABLESPACE_VERSION_DIRECTORY));
+ sprintf(linkloc_with_version_dir, "pg_tblspc/%u/%s", tablespaceoid,
+ TABLESPACE_VERSION_DIRECTORY);
/*
* Check if the tablespace still contains any files. We try to rmdir each
* and symlink. We want to allow a new DROP attempt to succeed at
* removing the catalog entries, so we should not give a hard error here.
*/
- dirdesc = AllocateDir(location);
+ dirdesc = AllocateDir(linkloc_with_version_dir);
if (dirdesc == NULL)
{
if (errno == ENOENT)
ereport(WARNING,
(errcode_for_file_access(),
errmsg("could not open directory \"%s\": %m",
- location)));
- pfree(location);
+ linkloc_with_version_dir)));
+ pfree(linkloc_with_version_dir);
return true;
}
/* else let ReadDir report the error */
}
- while ((de = ReadDir(dirdesc, location)) != NULL)
+ while ((de = ReadDir(dirdesc, linkloc_with_version_dir)) != NULL)
{
- /* Note we ignore PG_VERSION for the nonce */
if (strcmp(de->d_name, ".") == 0 ||
- strcmp(de->d_name, "..") == 0 ||
- strcmp(de->d_name, "PG_VERSION") == 0)
+ strcmp(de->d_name, "..") == 0)
continue;
- subfile = palloc(strlen(location) + 1 + strlen(de->d_name) + 1);
- sprintf(subfile, "%s/%s", location, de->d_name);
+ subfile = palloc(strlen(linkloc_with_version_dir) + 1 + strlen(de->d_name) + 1);
+ sprintf(subfile, "%s/%s", linkloc_with_version_dir, de->d_name);
/* This check is just to deliver a friendlier error message */
if (!directory_is_empty(subfile))
{
FreeDir(dirdesc);
+ pfree(subfile);
+ pfree(linkloc_with_version_dir);
return false;
}
- /* Do the real deed */
+ /* remove empty directory */
if (rmdir(subfile) < 0)
ereport(ERROR,
(errcode_for_file_access(),
FreeDir(dirdesc);
+ /* remove version directory */
+ if (rmdir(linkloc_with_version_dir) < 0)
+ ereport(ERROR,
+ (errcode_for_file_access(),
+ errmsg("could not remove directory \"%s\": %m",
+ linkloc_with_version_dir)));
+
/*
- * Okay, try to unlink PG_VERSION (we allow it to not be there, even in
- * non-REDO case, for robustness).
- */
- subfile = palloc(strlen(location) + 11 + 1);
- sprintf(subfile, "%s/PG_VERSION", location);
-
- if (unlink(subfile) < 0)
- {
- if (errno != ENOENT)
- ereport(ERROR,
- (errcode_for_file_access(),
- errmsg("could not remove file \"%s\": %m",
- subfile)));
- }
-
- pfree(subfile);
-
- /*
- * Okay, try to remove the symlink. We must however deal with the
+ * Try to remove the symlink. We must however deal with the
* possibility that it's a directory instead of a symlink --- this could
* happen during WAL replay (see TablespaceCreateDbspace), and it is also
- * the normal case on Windows.
+ * the case on Windows where junction points lstat() as directories.
*/
- if (lstat(location, &st) == 0 && S_ISDIR(st.st_mode))
+ linkloc = pstrdup(linkloc_with_version_dir);
+ get_parent_directory(linkloc);
+ if (lstat(linkloc, &st) == 0 && S_ISDIR(st.st_mode))
{
- if (rmdir(location) < 0)
+ if (rmdir(linkloc) < 0)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not remove directory \"%s\": %m",
- location)));
+ linkloc)));
}
else
{
- if (unlink(location) < 0)
+ if (unlink(linkloc) < 0)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not remove symbolic link \"%s\": %m",
- location)));
+ linkloc)));
}
- pfree(location);
+ pfree(linkloc_with_version_dir);
+ pfree(linkloc);
return true;
}
-/*
- * write out the PG_VERSION file in the specified directory
- */
-static void
-write_version_file(const char *path)
-{
- char *fullname;
- FILE *version_file;
-
- /* Now write the file */
- fullname = palloc(strlen(path) + 11 + 1);
- sprintf(fullname, "%s/PG_VERSION", path);
-
- if ((version_file = AllocateFile(fullname, PG_BINARY_W)) == NULL)
- ereport(ERROR,
- (errcode_for_file_access(),
- errmsg("could not write to file \"%s\": %m",
- fullname)));
- fprintf(version_file, "%s\n", PG_MAJORVERSION);
- if (FreeFile(version_file))
- ereport(ERROR,
- (errcode_for_file_access(),
- errmsg("could not write to file \"%s\": %m",
- fullname)));
-
- pfree(fullname);
-}
/*
* Check if a directory is empty.
return true;
}
+
/*
* Rename a tablespace
*/
{
xl_tblspc_create_rec *xlrec = (xl_tblspc_create_rec *) XLogRecGetData(record);
char *location = xlrec->ts_path;
- char *linkloc;
-
- /*
- * Attempt to coerce target directory to safe permissions. If this
- * fails, it doesn't exist or has the wrong owner.
- */
- if (chmod(location, 0700) != 0)
- ereport(ERROR,
- (errcode_for_file_access(),
- errmsg("could not set permissions on directory \"%s\": %m",
- location)));
-
- /* Create or re-create the PG_VERSION file in the target directory */
- write_version_file(location);
-
- /* Create the symlink if not already present */
- linkloc = (char *) palloc(OIDCHARS + OIDCHARS + 1);
- sprintf(linkloc, "pg_tblspc/%u", xlrec->ts_id);
-
- if (symlink(location, linkloc) < 0)
- {
- if (errno != EEXIST)
- ereport(ERROR,
- (errcode_for_file_access(),
- errmsg("could not create symbolic link \"%s\": %m",
- linkloc)));
- }
- pfree(linkloc);
+ create_tablespace_directories(location, xlrec->ts_id);
}
else if (info == XLOG_TBLSPC_DROP)
{
* remove all files then do conflict processing and try again,
* if currently enabled.
*/
- if (!remove_tablespace_directories(xlrec->ts_id, true))
+ if (!destroy_tablespace_directories(xlrec->ts_id, true))
{
VirtualTransactionId *temp_file_users;
* exited by now. So lets recheck before we throw an error.
* If !process_conflicts then this will just fail again.
*/
- if (!remove_tablespace_directories(xlrec->ts_id, true))
+ if (!destroy_tablespace_directories(xlrec->ts_id, true))
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("tablespace %u is not empty",
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