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Commitba7bee8

Browse files
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Backport "Add pgreadlink() on Windows to read junction points".
The patch to recurseively fsync pgdata needs this, but it was onlyintroduced in 9.1.
1 parent262fbcb commitba7bee8

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2 files changed

+121
-0
lines changed

2 files changed

+121
-0
lines changed

‎src/include/port.h

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -291,8 +291,11 @@ extern intpgunlink(const char *path);
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*/
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#if defined(WIN32)&& !defined(__CYGWIN__)
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externintpgsymlink(constchar*oldpath,constchar*newpath);
294+
externintpgreadlink(constchar*path,char*buf,size_tsize);
295+
externboolpgwin32_is_junction(char*path);
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295297
#definesymlink(oldpath,newpath)pgsymlink(oldpath, newpath)
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#definereadlink(path,buf,size)pgreadlink(path, buf, size)
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#endif
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externvoidcopydir(char*fromdir,char*todir,boolrecurse);

‎src/port/dirmod.c

Lines changed: 118 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -297,6 +297,124 @@ pgsymlink(const char *oldpath, const char *newpath)
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298298
return0;
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}
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/*
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*pgreadlink - uses Win32 junction points
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*/
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int
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pgreadlink(constchar*path,char*buf,size_tsize)
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{
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DWORDattr;
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HANDLEh;
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charbuffer[MAX_PATH*sizeof(WCHAR)+sizeof(REPARSE_JUNCTION_DATA_BUFFER)];
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REPARSE_JUNCTION_DATA_BUFFER*reparseBuf= (REPARSE_JUNCTION_DATA_BUFFER*)buffer;
311+
DWORDlen;
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intr;
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attr=GetFileAttributes(path);
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if (attr==INVALID_FILE_ATTRIBUTES)
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{
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_dosmaperr(GetLastError());
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return-1;
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}
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if ((attr&FILE_ATTRIBUTE_REPARSE_POINT)==0)
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{
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errno=EINVAL;
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return-1;
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}
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h=CreateFile(path,
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GENERIC_READ,
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FILE_SHARE_READ |FILE_SHARE_WRITE,
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NULL,
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OPEN_EXISTING,
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FILE_FLAG_OPEN_REPARSE_POINT |FILE_FLAG_BACKUP_SEMANTICS,
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0);
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if (h==INVALID_HANDLE_VALUE)
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{
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_dosmaperr(GetLastError());
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return-1;
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}
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if (!DeviceIoControl(h,
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FSCTL_GET_REPARSE_POINT,
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NULL,
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0,
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(LPVOID)reparseBuf,
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sizeof(buffer),
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&len,
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NULL))
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{
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LPSTRmsg;
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errno=0;
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FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |FORMAT_MESSAGE_FROM_SYSTEM,
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NULL,GetLastError(),
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MAKELANGID(LANG_ENGLISH,SUBLANG_DEFAULT),
354+
(LPSTR)&msg,0,NULL);
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#ifndefFRONTEND
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ereport(ERROR,
357+
(errcode_for_file_access(),
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errmsg("could not get junction for \"%s\": %s",
359+
path,msg)));
360+
#else
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fprintf(stderr,_("could not get junction for \"%s\": %s\n"),
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path,msg);
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#endif
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LocalFree(msg);
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CloseHandle(h);
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errno=EINVAL;
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return-1;
368+
}
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CloseHandle(h);
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/* Got it, let's get some results from this */
372+
if (reparseBuf->ReparseTag!=IO_REPARSE_TAG_MOUNT_POINT)
373+
{
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errno=EINVAL;
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return-1;
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}
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r=WideCharToMultiByte(CP_ACP,0,
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reparseBuf->PathBuffer,-1,
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buf,
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size,
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NULL,NULL);
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if (r <=0)
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{
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errno=EINVAL;
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return-1;
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}
389+
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/*
391+
* If the path starts with "\??\", which it will do in most (all?) cases,
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* strip those out.
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*/
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if (r>4&&strncmp(buf,"\\??\\",4)==0)
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{
396+
memmove(buf,buf+4,strlen(buf+4)+1);
397+
r-=4;
398+
}
399+
returnr;
400+
}
401+
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/*
403+
* Assumes the file exists, so will return false if it doesn't
404+
* (since a nonexistant file is not a junction)
405+
*/
406+
bool
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pgwin32_is_junction(char*path)
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{
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DWORDattr=GetFileAttributes(path);
410+
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if (attr==INVALID_FILE_ATTRIBUTES)
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{
413+
_dosmaperr(GetLastError());
414+
return false;
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}
416+
return ((attr&FILE_ATTRIBUTE_REPARSE_POINT)==FILE_ATTRIBUTE_REPARSE_POINT);
417+
}
300418
#endif/* defined(WIN32) && !defined(__CYGWIN__) */
301419

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