void zero_filemark_count(void)
{
free(filemarks);
filemark_alloc = 0;
filemarks = NULL;
meta.filemark_count = 0;
rewrite_meta_file();
}
static int
check_for_overwrite(uint8_t *sam_stat)
{
uint32_t blk_number;
uint64_t data_offset;
unsigned int i;
if (raw_pos.hdr.blk_type == B_EOD) {
return 0;
}
MHVTL_DBG(2, "At block %ld", (unsigned long)raw_pos.hdr.blk_number);
/* We aren't at EOD so we are performing a rewrite. Truncate
the data and index files back to the current length.
*/
blk_number = raw_pos.hdr.blk_number;
data_offset = raw_pos.data_offset;
if (ftruncate(indxfile, blk_number * sizeof(raw_pos))) {
mkSenseBuf(MEDIUM_ERROR, E_WRITE_ERROR, sam_stat);
MHVTL_ERR("Index file ftruncate failure, pos: "
"%" PRId64 ": %s",
(uint64_t)blk_number * sizeof(raw_pos),
strerror(errno));
return -1;
}
if (ftruncate(datafile, data_offset)) {
mkSenseBuf(MEDIUM_ERROR, E_WRITE_ERROR, sam_stat);
MHVTL_ERR("Data file ftruncate failure, pos: "
"%" PRId64 ": %s", data_offset,
strerror(errno));
return -1;
}
/* Update the filemark map removing any filemarks which will be
overwritten. Rewrite the filemark map so that the on-disk image
of the map is consistent with the new sizes of the other two files.
*/
for (i = 0; i < meta.filemark_count; i++) {
MHVTL_DBG(2, "filemarks[%d] %d", i, filemarks[i]);
if (filemarks[i] >= blk_number) {
MHVTL_DBG(2, "Setting filemark_count from %d to %d",
meta.filemark_count, i);
meta.filemark_count = i;
return rewrite_meta_file();
}
}
return 0;
}
static int add_filemark(uint32_t blk_number)
{
/* See if we have enough space remaining to add the new filemark. If
not, realloc now.
*/
if (check_filemarks_alloc(meta.filemark_count + 1))
return -1;
filemarks[meta.filemark_count++] = blk_number;
/* Now rewrite the meta_header structure and the filemark map. */
return rewrite_meta_file();
}
void
unload_tape(uint8_t *sam_stat)
{
if (datafile >= 0) {
close(datafile);
datafile = -1;
}
if (indxfile >= 0) {
close(indxfile);
indxfile = -1;
}
if (metafile >= 0) {
rewrite_meta_file();
close(metafile);
metafile = -1;
}
}
void unload_tape(uint8_t *sam_stat)
{
if (datafile >= 0) {
close(datafile);
datafile = -1;
}
if (indxfile >= 0) {
close(indxfile);
indxfile = -1;
}
if (metafile >= 0) {
rewrite_meta_file();
close(metafile);
metafile = -1;
}
free(filemarks);
filemarks = NULL;
filemark_alloc = 0;
}
