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Fix mdsyncfiletag(), take II. 

The previous commit failed to consider that FileGetRawDesc() might
not return a valid fd, as discovered on the build farm.  Switch to
using the File interface only.

Back-patch to 12, like the previous commit.
This commit is contained in:
Thomas Munro 2019-12-14 17:38:09 +13:00
parent 7bb3102cea
commit 7c85be08a2
1 changed files with 9 additions and 16 deletions
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25
src/backend/storage/smgr/md.c
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@ -1280,19 +1280,16 @@ int
mdsyncfiletag(const FileTag *ftag, char *path)
{
SMgrRelation reln = smgropen(ftag->rnode, InvalidBackendId);
int fd,
result,
save_errno;
File file;
bool need_to_close;
int result,
save_errno;
/* See if we already have the file open, or need to open it. */
if (ftag->segno < reln->md_num_open_segs[ftag->forknum])
{
File file;
file = reln->md_seg_fds[ftag->forknum][ftag->segno].mdfd_vfd;
strlcpy(path, FilePathName(file), MAXPGPATH);
fd = FileGetRawDesc(file);
need_to_close = false;
}
else
@ -1303,24 +1300,20 @@ mdsyncfiletag(const FileTag *ftag, char *path)
strlcpy(path, p, MAXPGPATH);
pfree(p);
fd = OpenTransientFile(path, O_RDWR);
if (fd < 0)
file = PathNameOpenFile(path, O_RDWR | PG_BINARY);
if (file < 0)
return -1;
need_to_close = true;
}
/* Sync the file. */
pgstat_report_wait_start(WAIT_EVENT_DATA_FILE_SYNC);
result = pg_fsync(fd);
result = FileSync(file, WAIT_EVENT_DATA_FILE_SYNC);
save_errno = errno;
pgstat_report_wait_end();
if (need_to_close && CloseTransientFile(fd) != 0)
ereport(WARNING,
(errcode_for_file_access(),
errmsg("could not close file \"%s\": %m", path)));
if (need_to_close)
FileClose(file);
errno = save_errno;
return result;
}