-#define STRIDE_LENGTH 8
-/*
- * Helper function which zeros out _num_ blocks starting at _blk_. In
- * case of an error, the details of the error is returned via _ret_blk_
- * and _ret_count_ if they are non-NULL pointers. Returns 0 on
- * success, and an error code on an error.
- *
- * As a special case, if the first argument is NULL, then it will
- * attempt to free the static zeroizing buffer. (This is to keep
- * programs that check for memory leaks happy.)
- */
-errcode_t e2fsck_zero_blocks(ext2_filsys fs, blk_t blk, int num,
- blk_t *ret_blk, int *ret_count)
-{
- int j, count;
- static char *buf;
- errcode_t retval;
-
- /* If fs is null, clean up the static buffer and return */
- if (!fs) {
- if (buf) {
- free(buf);
- buf = 0;
- }
- return 0;
- }
- /* Allocate the zeroizing buffer if necessary */
- if (!buf) {
- buf = malloc(fs->blocksize * STRIDE_LENGTH);
- if (!buf) {
- com_err("malloc", ENOMEM,
- _("while allocating zeroizing buffer"));
- exit(1);
- }
- memset(buf, 0, fs->blocksize * STRIDE_LENGTH);
- }
- /* OK, do the write loop */
- for (j = 0; j < num; j += STRIDE_LENGTH, blk += STRIDE_LENGTH) {
- count = num - j;
- if (count > STRIDE_LENGTH)
- count = STRIDE_LENGTH;
- retval = io_channel_write_blk64(fs->io, blk, count, buf);
- if (retval) {
- if (ret_count)
- *ret_count = count;
- if (ret_blk)
- *ret_blk = blk;
- return retval;
- }
- }
- return 0;
-}
-