diff options
Diffstat (limited to 'src/backend/storage/file/fd.c')
| -rw-r--r-- | src/backend/storage/file/fd.c | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c index 0e8299dd556..a4ec7959f31 100644 --- a/src/backend/storage/file/fd.c +++ b/src/backend/storage/file/fd.c @@ -400,25 +400,22 @@ pg_fsync(int fd) * portable, even if it runs ok on the current system. * * We assert here that a descriptor for a file was opened with write - * permissions (either O_RDWR or O_WRONLY) and for a directory without - * write permissions (O_RDONLY). + * permissions (i.e., not O_RDONLY) and for a directory without write + * permissions (O_RDONLY). Notice that the assertion check is made even + * if fsync() is disabled. * - * Ignore any fstat errors and let the follow-up fsync() do its work. - * Doing this sanity check here counts for the case where fsync() is - * disabled. + * If fstat() fails, ignore it and let the follow-up fsync() complain. */ if (fstat(fd, &st) == 0) { int desc_flags = fcntl(fd, F_GETFL); - /* - * O_RDONLY is historically 0, so just make sure that for directories - * no write flags are used. - */ + desc_flags &= O_ACCMODE; + if (S_ISDIR(st.st_mode)) - Assert((desc_flags & (O_RDWR | O_WRONLY)) == 0); + Assert(desc_flags == O_RDONLY); else - Assert((desc_flags & (O_RDWR | O_WRONLY)) != 0); + Assert(desc_flags != O_RDONLY); } errno = 0; #endif |