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Commit7a57a67

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Replace opendir/closedir calls throughout the backend with AllocateDir
and FreeDir routines modeled on the existing AllocateFile/FreeFile.Like the latter, these routines will avoid failing on EMFILE/ENFILEconditions whenever possible, and will prevent leakage of directorydescriptors if an elog() occurs while one is open.Also, reduce PANIC to ERROR in MoveOfflineLogs() --- this is notcritical code and there is no reason to force a DB restart on failure.All per recent trouble report from Olivier Hubaut.
1 parent4f57131 commit7a57a67

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6 files changed

+138
-41
lines changed

6 files changed

+138
-41
lines changed

‎contrib/dbsize/dbsize.c‎

Lines changed: 3 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1,16 +1,15 @@
11
#include"postgres.h"
22

33
#include<sys/types.h>
4-
#include<dirent.h>
54
#include<sys/stat.h>
65
#include<unistd.h>
7-
#include<errno.h>
86

97
#include"access/heapam.h"
108
#include"catalog/catalog.h"
119
#include"catalog/namespace.h"
1210
#include"commands/dbcommands.h"
1311
#include"fmgr.h"
12+
#include"storage/fd.h"
1413
#include"utils/builtins.h"
1514

1615

@@ -58,7 +57,7 @@ database_size(PG_FUNCTION_ARGS)
5857

5958
dbpath=GetDatabasePath(dbid);
6059

61-
dirdesc=opendir(dbpath);
60+
dirdesc=AllocateDir(dbpath);
6261
if (!dirdesc)
6362
ereport(ERROR,
6463
(errcode_for_file_access(),
@@ -93,7 +92,7 @@ database_size(PG_FUNCTION_ARGS)
9392
pfree(fullname);
9493
}
9594

96-
closedir(dirdesc);
95+
FreeDir(dirdesc);
9796

9897
PG_RETURN_INT64(totalsize);
9998
}

‎src/backend/access/transam/slru.c‎

Lines changed: 3 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -6,15 +6,13 @@
66
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
77
* Portions Copyright (c) 1994, Regents of the University of California
88
*
9-
* $PostgreSQL: pgsql/src/backend/access/transam/slru.c,v 1.12 2004/02/1703:45:17 momjian Exp $
9+
* $PostgreSQL: pgsql/src/backend/access/transam/slru.c,v 1.13 2004/02/23 23:03:10 tgl Exp $
1010
*
1111
*-------------------------------------------------------------------------
1212
*/
1313
#include"postgres.h"
1414

1515
#include<fcntl.h>
16-
#include<dirent.h>
17-
#include<errno.h>
1816
#include<sys/stat.h>
1917
#include<unistd.h>
2018

@@ -888,7 +886,7 @@ SlruScanDirectory(SlruCtl ctl, int cutoffPage, bool doDeletions)
888886
intsegpage;
889887
charpath[MAXPGPATH];
890888

891-
cldir=opendir(ctl->Dir);
889+
cldir=AllocateDir(ctl->Dir);
892890
if (cldir==NULL)
893891
ereport(ERROR,
894892
(errcode_for_file_access(),
@@ -927,7 +925,7 @@ SlruScanDirectory(SlruCtl ctl, int cutoffPage, bool doDeletions)
927925
ereport(ERROR,
928926
(errcode_for_file_access(),
929927
errmsg("could not read directory \"%s\": %m",ctl->Dir)));
930-
closedir(cldir);
928+
FreeDir(cldir);
931929

932930
returnfound;
933931
}

‎src/backend/access/transam/xlog.c‎

Lines changed: 5 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.136 2004/02/1703:45:17 momjian Exp $
10+
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.137 2004/02/23 23:03:10 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -17,10 +17,8 @@
1717
#include<fcntl.h>
1818
#include<signal.h>
1919
#include<unistd.h>
20-
#include<errno.h>
2120
#include<sys/stat.h>
2221
#include<sys/time.h>
23-
#include<dirent.h>
2422

2523
#include"access/clog.h"
2624
#include"access/transam.h"
@@ -1753,9 +1751,9 @@ MoveOfflineLogs(uint32 log, uint32 seg, XLogRecPtr endptr)
17531751

17541752
XLByteToPrevSeg(endptr,endlogId,endlogSeg);
17551753

1756-
xldir=opendir(XLogDir);
1754+
xldir=AllocateDir(XLogDir);
17571755
if (xldir==NULL)
1758-
ereport(PANIC,
1756+
ereport(ERROR,
17591757
(errcode_for_file_access(),
17601758
errmsg("could not open transaction log directory \"%s\": %m",
17611759
XLogDir)));
@@ -1812,11 +1810,11 @@ MoveOfflineLogs(uint32 log, uint32 seg, XLogRecPtr endptr)
18121810
errno=0;
18131811
#endif
18141812
if (errno)
1815-
ereport(PANIC,
1813+
ereport(ERROR,
18161814
(errcode_for_file_access(),
18171815
errmsg("could not read transaction log directory \"%s\": %m",
18181816
XLogDir)));
1819-
closedir(xldir);
1817+
FreeDir(xldir);
18201818
}
18211819

18221820
/*

‎src/backend/storage/file/fd.c‎

Lines changed: 109 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1994, Regents of the University of California
88
*
99
* IDENTIFICATION
10-
* $PostgreSQL: pgsql/src/backend/storage/file/fd.c,v 1.107 2004/02/2320:45:59 tgl Exp $
10+
* $PostgreSQL: pgsql/src/backend/storage/file/fd.c,v 1.108 2004/02/2323:03:10 tgl Exp $
1111
*
1212
* NOTES:
1313
*
@@ -43,8 +43,6 @@
4343
#include<sys/file.h>
4444
#include<sys/param.h>
4545
#include<sys/stat.h>
46-
#include<dirent.h>
47-
#include<errno.h>
4846
#include<unistd.h>
4947
#include<fcntl.h>
5048

@@ -87,11 +85,11 @@ intmax_files_per_process = 1000;
8785

8886
/*
8987
* Maximum number of file descriptors to open for either VFD entries or
90-
* AllocateFile files. This is initialized to a conservative value, and
91-
* remains that way indefinitely in bootstrap or standalone-backend cases.
92-
* In normal postmaster operation, the postmaster calls set_max_safe_fds()
93-
* late in initialization to update the value, and that value is then
94-
* inherited by forked subprocesses.
88+
* AllocateFile/AllocateDir operations. This is initialized to a conservative
89+
*value, andremains that way indefinitely in bootstrap or standalone-backend
90+
*cases.In normal postmaster operation, the postmaster calls
91+
*set_max_safe_fds()late in initialization to update the value, and that
92+
*value is theninherited by forked subprocesses.
9593
*
9694
* Note: the value of max_files_per_process is taken into account while
9795
* setting this variable, and so need not be tested separately.
@@ -159,6 +157,17 @@ static intnfile = 0;
159157
staticintnumAllocatedFiles=0;
160158
staticFILE*allocatedFiles[MAX_ALLOCATED_FILES];
161159

160+
/*
161+
* List of <dirent.h> DIRs opened with AllocateDir.
162+
*
163+
* Since we don't have heavy use of AllocateDir, it seems OK to put a pretty
164+
* small maximum limit on the number of simultaneously allocated dirs.
165+
*/
166+
#defineMAX_ALLOCATED_DIRS 10
167+
168+
staticintnumAllocatedDirs=0;
169+
staticDIR*allocatedDirs[MAX_ALLOCATED_DIRS];
170+
162171
/*
163172
* Number of temporary files opened during the current session;
164173
* this is used in generation of tempfile names.
@@ -489,7 +498,7 @@ LruInsert(File file)
489498

490499
if (FileIsNotOpen(file))
491500
{
492-
while (nfile+numAllocatedFiles >=max_safe_fds)
501+
while (nfile+numAllocatedFiles+numAllocatedDirs>=max_safe_fds)
493502
{
494503
if (!ReleaseLruFile())
495504
break;
@@ -748,7 +757,7 @@ fileNameOpenFile(FileName fileName,
748757
file=AllocateVfd();
749758
vfdP=&VfdCache[file];
750759

751-
while (nfile+numAllocatedFiles >=max_safe_fds)
760+
while (nfile+numAllocatedFiles+numAllocatedDirs>=max_safe_fds)
752761
{
753762
if (!ReleaseLruFile())
754763
break;
@@ -1099,8 +1108,8 @@ AllocateFile(char *name, char *mode)
10991108
* looping.
11001109
*/
11011110
if (numAllocatedFiles >=MAX_ALLOCATED_FILES||
1102-
numAllocatedFiles >=max_safe_fds-1)
1103-
elog(ERROR,"too many privateFDs demanded");
1111+
numAllocatedFiles+numAllocatedDirs>=max_safe_fds-1)
1112+
elog(ERROR,"too many privatefiles demanded");
11041113

11051114
TryAgain:
11061115
if ((file=fopen(name,mode))!=NULL)
@@ -1155,6 +1164,86 @@ FreeFile(FILE *file)
11551164
returnfclose(file);
11561165
}
11571166

1167+
1168+
/*
1169+
* Routines that want to use <dirent.h> (ie, DIR*) should use AllocateDir
1170+
* rather than plain opendir(). This lets fd.c deal with freeing FDs if
1171+
* necessary to open the directory, and with closing it after an elog.
1172+
* When done, call FreeDir rather than closedir.
1173+
*
1174+
* Ideally this should be the *only* direct call of opendir() in the backend.
1175+
*/
1176+
DIR*
1177+
AllocateDir(constchar*dirname)
1178+
{
1179+
DIR*dir;
1180+
1181+
DO_DB(elog(LOG,"AllocateDir: Allocated %d",numAllocatedDirs));
1182+
1183+
/*
1184+
* The test against MAX_ALLOCATED_DIRS prevents us from overflowing
1185+
* allocatedDirs[]; the test against max_safe_fds prevents AllocateDir
1186+
* from hogging every one of the available FDs, which'd lead to infinite
1187+
* looping.
1188+
*/
1189+
if (numAllocatedDirs >=MAX_ALLOCATED_DIRS||
1190+
numAllocatedDirs+numAllocatedFiles >=max_safe_fds-1)
1191+
elog(ERROR,"too many private dirs demanded");
1192+
1193+
TryAgain:
1194+
if ((dir=opendir(dirname))!=NULL)
1195+
{
1196+
allocatedDirs[numAllocatedDirs]=dir;
1197+
numAllocatedDirs++;
1198+
returndir;
1199+
}
1200+
1201+
if (errno==EMFILE||errno==ENFILE)
1202+
{
1203+
intsave_errno=errno;
1204+
1205+
ereport(LOG,
1206+
(errcode(ERRCODE_INSUFFICIENT_RESOURCES),
1207+
errmsg("out of file descriptors: %m; release and retry")));
1208+
errno=0;
1209+
if (ReleaseLruFile())
1210+
gotoTryAgain;
1211+
errno=save_errno;
1212+
}
1213+
1214+
returnNULL;
1215+
}
1216+
1217+
/*
1218+
* Close a directory opened with AllocateDir.
1219+
*
1220+
* Note we do not check closedir's return value --- it is up to the caller
1221+
* to handle close errors.
1222+
*/
1223+
int
1224+
FreeDir(DIR*dir)
1225+
{
1226+
inti;
1227+
1228+
DO_DB(elog(LOG,"FreeDir: Allocated %d",numAllocatedDirs));
1229+
1230+
/* Remove dir from list of allocated dirs, if it's present */
1231+
for (i=numAllocatedDirs;--i >=0;)
1232+
{
1233+
if (allocatedDirs[i]==dir)
1234+
{
1235+
numAllocatedDirs--;
1236+
allocatedDirs[i]=allocatedDirs[numAllocatedDirs];
1237+
break;
1238+
}
1239+
}
1240+
if (i<0)
1241+
elog(WARNING,"dir passed to FreeDir was not obtained from AllocateDir");
1242+
1243+
returnclosedir(dir);
1244+
}
1245+
1246+
11581247
/*
11591248
* closeAllVfds
11601249
*
@@ -1211,7 +1300,7 @@ AtProcExit_Files(int code, Datum arg)
12111300
* exiting. If that's the case, we should remove all temporary files; if
12121301
* that's not the case, we are being called for transaction commit/abort
12131302
* and should only remove transaction-local temp files. In either case,
1214-
* also clean up "allocated" stdio files.
1303+
* also clean up "allocated" stdio files and dirs.
12151304
*/
12161305
staticvoid
12171306
CleanupTempFiles(boolisProcExit)
@@ -1240,6 +1329,9 @@ CleanupTempFiles(bool isProcExit)
12401329

12411330
while (numAllocatedFiles>0)
12421331
FreeFile(allocatedFiles[0]);
1332+
1333+
while (numAllocatedDirs>0)
1334+
FreeDir(allocatedDirs[0]);
12431335
}
12441336

12451337

@@ -1271,7 +1363,7 @@ RemovePgTempFiles(void)
12711363
* files.
12721364
*/
12731365
snprintf(db_path,sizeof(db_path),"%s/base",DataDir);
1274-
if ((db_dir=opendir(db_path))!=NULL)
1366+
if ((db_dir=AllocateDir(db_path))!=NULL)
12751367
{
12761368
while ((db_de=readdir(db_dir))!=NULL)
12771369
{
@@ -1287,7 +1379,7 @@ RemovePgTempFiles(void)
12871379
"%s/%s/%s",
12881380
db_path,db_de->d_name,
12891381
PG_TEMP_FILES_DIR);
1290-
if ((temp_dir=opendir(temp_path))!=NULL)
1382+
if ((temp_dir=AllocateDir(temp_path))!=NULL)
12911383
{
12921384
while ((temp_de=readdir(temp_dir))!=NULL)
12931385
{
@@ -1310,9 +1402,9 @@ RemovePgTempFiles(void)
13101402
"unexpected file found in temporary-files directory: \"%s\"",
13111403
rm_path);
13121404
}
1313-
closedir(temp_dir);
1405+
FreeDir(temp_dir);
13141406
}
13151407
}
1316-
closedir(db_dir);
1408+
FreeDir(db_dir);
13171409
}
13181410
}

‎src/include/storage/fd.h‎

Lines changed: 12 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $PostgreSQL: pgsql/src/include/storage/fd.h,v 1.43 2004/02/2320:45:59 tgl Exp $
10+
* $PostgreSQL: pgsql/src/include/storage/fd.h,v 1.44 2004/02/2323:03:10 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -31,10 +31,16 @@
3131
* use FreeFile, not fclose, to close it. AVOID using stdio for files
3232
* that you intend to hold open for any length of time, since there is
3333
* no way for them to share kernel file descriptors with other files.
34+
*
35+
* Likewise, use AllocateDir/FreeDir, not opendir/closedir, to allocate
36+
* open directories (DIR*).
3437
*/
3538
#ifndefFD_H
3639
#defineFD_H
3740

41+
#include<dirent.h>
42+
43+
3844
/*
3945
* FileSeek uses the standard UNIX lseek(2) flags.
4046
*/
@@ -65,7 +71,11 @@ extern intFileTruncate(File file, long offset);
6571

6672
/* Operations that allow use of regular stdio --- USE WITH CAUTION */
6773
externFILE*AllocateFile(char*name,char*mode);
68-
externintFreeFile(FILE*);
74+
externintFreeFile(FILE*file);
75+
76+
/* Operations to allow use of the <dirent.h> library routines */
77+
externDIR*AllocateDir(constchar*dirname);
78+
externintFreeDir(DIR*dir);
6979

7080
/* If you've really really gotta have a plain kernel FD, use this */
7181
externintBasicOpenFile(FileNamefileName,intfileFlags,intfileMode);

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