diff options
Diffstat (limited to 'source4/lib/tdb/common/io.c')
| -rw-r--r-- | source4/lib/tdb/common/io.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/source4/lib/tdb/common/io.c b/source4/lib/tdb/common/io.c index ea925f3895..a24b5e24a2 100644 --- a/source4/lib/tdb/common/io.c +++ b/source4/lib/tdb/common/io.c @@ -232,15 +232,28 @@ static int tdb_expand_file(struct tdb_context *tdb, tdb_off_t size, tdb_off_t ad disk. This must be done with write, not via mmap */ memset(buf, TDB_PAD_BYTE, sizeof(buf)); while (addition) { - int n = addition>sizeof(buf)?sizeof(buf):addition; - int ret = pwrite(tdb->fd, buf, n, size); - if (ret == -1) { - TDB_LOG((tdb, TDB_DEBUG_FATAL, "expand_file write of %d failed (%s)\n", - n, strerror(errno))); + size_t n = addition>sizeof(buf)?sizeof(buf):addition; + ssize_t written = pwrite(tdb->fd, buf, n, size); + if (written == 0) { + /* prevent infinite loops: try _once_ more */ + written = pwrite(tdb->fd, buf, n, size); + } + if (written == 0) { + /* give up, trying to provide a useful errno */ + TDB_LOG((tdb, TDB_DEBUG_FATAL, "expand_file write " + "returned 0 twice: giving up!\n")); + errno = ENOSPC; + return -1; + } else if (written == -1) { + TDB_LOG((tdb, TDB_DEBUG_FATAL, "expand_file write of " + "%d bytes failed (%s)\n", n, strerror(errno))); return -1; + } else if (written != n) { + TDB_LOG((tdb, TDB_DEBUG_WARNING, "expand_file: wrote " + "only %d of %d bytes - retrying\n", written,n)); } - addition -= ret; - size += ret; + addition -= written; + size += written; } return 0; } |