QUERY_FILE_LAYOUT_INCLUDE_STREAMS_WITH_NO_CLUSTERS_ALLOCATED,
.FilterType = QUERY_FILE_LAYOUT_FILTER_TYPE_NONE,
};
- const size_t outsize = 32768;
+ size_t outsize = 32768;
QUERY_FILE_LAYOUT_OUTPUT *out = NULL;
int ret;
NTSTATUS status;
goto out;
}
- out = MALLOC(outsize);
- if (!out) {
- ret = WIMLIB_ERR_NOMEM;
- goto out;
- }
+ for (;;) {
+ /* Allocate a buffer for the output of the ioctl. */
+ out = MALLOC(outsize);
+ if (!out) {
+ ret = WIMLIB_ERR_NOMEM;
+ goto out;
+ }
- while (NT_SUCCESS(status = winnt_fsctl(h, FSCTL_QUERY_FILE_LAYOUT,
- &in, sizeof(in),
- out, outsize, NULL)))
- {
- const FILE_LAYOUT_ENTRY *file =
- (const void *)out + out->FirstFileOffset;
- for (;;) {
- ret = load_one_file(file, inode_map);
- if (ret)
- goto out;
- if (file->NextFileOffset == 0)
- break;
- file = (const void *)file + file->NextFileOffset;
+ /* Execute FSCTL_QUERY_FILE_LAYOUT until it fails. */
+ while (NT_SUCCESS(status = winnt_fsctl(h,
+ FSCTL_QUERY_FILE_LAYOUT,
+ &in, sizeof(in),
+ out, outsize, NULL)))
+ {
+ const FILE_LAYOUT_ENTRY *file =
+ (const void *)out + out->FirstFileOffset;
+ for (;;) {
+ ret = load_one_file(file, inode_map);
+ if (ret)
+ goto out;
+ if (file->NextFileOffset == 0)
+ break;
+ file = (const void *)file + file->NextFileOffset;
+ }
+ in.Flags &= ~QUERY_FILE_LAYOUT_RESTART;
}
- in.Flags &= ~QUERY_FILE_LAYOUT_RESTART;
+
+ /* Enlarge the buffer if needed. */
+ if (status != STATUS_BUFFER_TOO_SMALL)
+ break;
+ FREE(out);
+ outsize *= 2;
}
/* Normally, FSCTL_QUERY_FILE_LAYOUT fails with STATUS_END_OF_FILE after