/*
* Identify a suitable default timezone setting based on the environment.
*
* The installation share_path must be passed in, as that is the default
* location for the timezone database directory.
*
* We first look to the TZ environment variable. If not found or not
* recognized by our own code, we see if we can identify the timezone
* from the behavior of the system timezone library. When all else fails,
* return NULL, indicating that we should default to GMT.
*/
const char *
select_default_timezone(const char *share_path)
{
const char *tzname;
/* Initialize timezone directory path, if needed */
#ifndef SYSTEMTZDIR
snprintf(tzdirpath, sizeof(tzdirpath), "%s/timezone", share_path);
#endif
/* Check TZ environment variable */
tzname = getenv("TZ");
if (validate_zone(tzname))
return tzname;
/* Nope, so try to identify the system timezone */
tzname = identify_system_timezone();
if (validate_zone(tzname))
return tzname;
return NULL;
}
int
hammer_ioc_dedup(hammer_transaction_t trans, hammer_inode_t ip,
struct hammer_ioc_dedup *dedup)
{
struct hammer_cursor cursor1, cursor2;
int error;
int seq;
/*
* Enforce hammer filesystem version requirements
*/
if (trans->hmp->version < HAMMER_VOL_VERSION_FIVE) {
kprintf("hammer: Filesystem must be upgraded to v5 "
"before you can run dedup\n");
return (EOPNOTSUPP); /* 95*/
}
/*
* Cursor1, return an error -> candidate goes to pass2 list
*/
error = hammer_init_cursor(trans, &cursor1, NULL, NULL);
if (error)
goto done_cursor;
cursor1.key_beg = dedup->elm1;
cursor1.flags |= HAMMER_CURSOR_BACKEND;
error = hammer_btree_lookup(&cursor1);
if (error)
goto done_cursor;
error = hammer_btree_extract(&cursor1, HAMMER_CURSOR_GET_LEAF |
HAMMER_CURSOR_GET_DATA);
if (error)
goto done_cursor;
/*
* Cursor2, return an error -> candidate goes to pass2 list
*/
error = hammer_init_cursor(trans, &cursor2, NULL, NULL);
if (error)
goto done_cursors;
cursor2.key_beg = dedup->elm2;
cursor2.flags |= HAMMER_CURSOR_BACKEND;
error = hammer_btree_lookup(&cursor2);
if (error)
goto done_cursors;
error = hammer_btree_extract(&cursor2, HAMMER_CURSOR_GET_LEAF |
HAMMER_CURSOR_GET_DATA);
if (error)
goto done_cursors;
/*
* Zone validation. We can't de-dup any of the other zones
* (BTREE or META) or bad things will happen.
*
* Return with error = 0, but set an INVALID_ZONE flag.
*/
error = validate_zone(cursor1.leaf->data_offset) +
validate_zone(cursor2.leaf->data_offset);
if (error) {
dedup->head.flags |= HAMMER_IOC_DEDUP_INVALID_ZONE;
error = 0;
goto done_cursors;
}
/*
* Comparison checks
*
* If zones don't match or data_len fields aren't the same
* we consider it to be a comparison failure.
*
* Return with error = 0, but set a CMP_FAILURE flag.
*/
if ((cursor1.leaf->data_offset & HAMMER_OFF_ZONE_MASK) !=
(cursor2.leaf->data_offset & HAMMER_OFF_ZONE_MASK)) {
dedup->head.flags |= HAMMER_IOC_DEDUP_CMP_FAILURE;
goto done_cursors;
}
if (cursor1.leaf->data_len != cursor2.leaf->data_len) {
dedup->head.flags |= HAMMER_IOC_DEDUP_CMP_FAILURE;
goto done_cursors;
}
/* byte-by-byte comparison to be sure */
if (bcmp(cursor1.data, cursor2.data, cursor1.leaf->data_len)) {
dedup->head.flags |= HAMMER_IOC_DEDUP_CMP_FAILURE;
goto done_cursors;
}
/*
* Upgrade both cursors together to an exclusive lock
*
* Return an error -> candidate goes to pass2 list
*/
hammer_sync_lock_sh(trans);
error = hammer_cursor_upgrade2(&cursor1, &cursor2);
if (error) {
hammer_sync_unlock(trans);
goto done_cursors;
}
error = hammer_blockmap_dedup(cursor1.trans,
cursor1.leaf->data_offset, cursor1.leaf->data_len);
if (error) {
if (error == ERANGE) {
/*
* Return with error = 0, but set an UNDERFLOW flag
*/
dedup->head.flags |= HAMMER_IOC_DEDUP_UNDERFLOW;
error = 0;
goto downgrade_cursors;
} else {
/*
* Return an error -> block goes to pass2 list
*/
goto downgrade_cursors;
}
}
/*
* The cursor2's cache must be invalidated before calling
* hammer_blockmap_free(), otherwise it will not be able to
* invalidate the underlying data buffer.
*/
hammer_cursor_invalidate_cache(&cursor2);
hammer_blockmap_free(cursor2.trans,
cursor2.leaf->data_offset, cursor2.leaf->data_len);
hammer_modify_node(cursor2.trans, cursor2.node,
&cursor2.leaf->data_offset, sizeof(hammer_off_t));
cursor2.leaf->data_offset = cursor1.leaf->data_offset;
hammer_modify_node_done(cursor2.node);
downgrade_cursors:
hammer_cursor_downgrade2(&cursor1, &cursor2);
hammer_sync_unlock(trans);
done_cursors:
hammer_done_cursor(&cursor2);
done_cursor:
hammer_done_cursor(&cursor1);
/*
* Avoid deadlocking the buffer cache
*/
seq = trans->hmp->flusher.done;
while (hammer_flusher_meta_halflimit(trans->hmp) ||
hammer_flusher_undo_exhausted(trans, 2)) {
hammer_flusher_wait(trans->hmp, seq);
seq = hammer_flusher_async_one(trans->hmp);
}
return (error);
}
