static
int
hammer_ioc_get_data(hammer_transaction_t trans, hammer_inode_t ip,
struct hammer_ioc_data *data)
{
struct hammer_cursor cursor;
int bytes;
int error;
/* XXX cached inode ? */
error = hammer_init_cursor(trans, &cursor, NULL, NULL);
if (error)
goto failed;
cursor.key_beg = data->elm;
cursor.flags |= HAMMER_CURSOR_BACKEND;
error = hammer_btree_lookup(&cursor);
if (error == 0) {
error = hammer_btree_extract_data(&cursor);
if (error == 0) {
data->leaf = *cursor.leaf;
bytes = cursor.leaf->data_len;
if (bytes > data->size)
bytes = data->size;
error = copyout(cursor.data, data->ubuf, bytes);
}
}
failed:
hammer_done_cursor(&cursor);
return (error);
}
/*
* This works like write_rec but no write or update is necessary,
* and no data payload is included so we couldn't do a write even
* if we wanted to.
*
* We must still iterate for deletions, and we can validate the
* record header which is a good way to test for corrupted mirror
* targets XXX.
*
* mirror->key_cur must be carefully set when we succeed in processing
* this mrec.
*/
static
int
hammer_ioc_mirror_write_pass(hammer_cursor_t cursor,
struct hammer_ioc_mrecord_rec *mrec,
struct hammer_ioc_mirror_rw *mirror,
u_int32_t localization)
{
int error;
/*
* Re-localize for target. Relocalization of data is handled
* by hammer_mirror_write().
*/
mrec->leaf.base.localization &= HAMMER_LOCALIZE_MASK;
mrec->leaf.base.localization += localization;
/*
* Delete records through until we reach (non-inclusively) the
* target record.
*/
cursor->key_end = mrec->leaf.base;
cursor->flags &= ~HAMMER_CURSOR_END_INCLUSIVE;
cursor->flags |= HAMMER_CURSOR_BACKEND;
error = hammer_mirror_delete_to(cursor, mirror);
/*
* Certain records are not part of the mirroring operation
*/
if (hammer_mirror_nomirror(&mrec->leaf.base))
return(0);
/*
* Locate the record and get past it by setting ATEDISK. Perform
* any necessary deletions. We have no data payload and cannot
* create a new record.
*/
if (error == 0) {
mirror->key_cur = mrec->leaf.base;
cursor->key_beg = mrec->leaf.base;
cursor->flags |= HAMMER_CURSOR_BACKEND;
cursor->flags &= ~HAMMER_CURSOR_INSERT;
error = hammer_btree_lookup(cursor);
if (error == 0) {
if (hammer_mirror_check(cursor, mrec))
error = hammer_mirror_update(cursor, mrec);
cursor->flags |= HAMMER_CURSOR_ATEDISK;
} else {
cursor->flags &= ~HAMMER_CURSOR_ATEDISK;
}
if (error == ENOENT)
error = 0;
}
return(error);
}
/*
* Handle skip records.
*
* We must iterate from the last resolved record position at mirror->key_cur
* to skip_beg non-inclusive and delete any records encountered.
*
* mirror->key_cur must be carefully set when we succeed in processing
* this mrec.
*/
static int
hammer_ioc_mirror_write_skip(hammer_cursor_t cursor,
struct hammer_ioc_mrecord_skip *mrec,
struct hammer_ioc_mirror_rw *mirror,
u_int32_t localization)
{
int error;
/*
* Relocalize the skip range
*/
mrec->skip_beg.localization &= HAMMER_LOCALIZE_MASK;
mrec->skip_beg.localization += localization;
mrec->skip_end.localization &= HAMMER_LOCALIZE_MASK;
mrec->skip_end.localization += localization;
/*
* Iterate from current position to skip_beg, deleting any records
* we encounter. The record at skip_beg is not included (it is
* skipped).
*/
cursor->key_end = mrec->skip_beg;
cursor->flags &= ~HAMMER_CURSOR_END_INCLUSIVE;
cursor->flags |= HAMMER_CURSOR_BACKEND;
error = hammer_mirror_delete_to(cursor, mirror);
/*
* Now skip past the skip (which is the whole point point of
* having a skip record). The sender has not sent us any records
* for the skip area so we wouldn't know what to keep and what
* to delete anyway.
*
* Clear ATEDISK because skip_end is non-inclusive, so we can't
* count an exact match if we happened to get one.
*/
if (error == 0) {
mirror->key_cur = mrec->skip_end;
cursor->key_beg = mrec->skip_end;
error = hammer_btree_lookup(cursor);
cursor->flags &= ~HAMMER_CURSOR_ATEDISK;
if (error == ENOENT)
error = 0;
}
return(error);
}
/*
* Retrieve the PFS hammer cleanup utility config record. This is
* different (newer than) the PFS config.
*/
static
int
hammer_ioc_get_config(hammer_transaction_t trans, hammer_inode_t ip,
struct hammer_ioc_config *config)
{
struct hammer_cursor cursor;
int error;
error = hammer_init_cursor(trans, &cursor, &ip->cache[0], NULL);
if (error) {
hammer_done_cursor(&cursor);
return(error);
}
cursor.key_beg.obj_id = HAMMER_OBJID_ROOT;
cursor.key_beg.create_tid = 0;
cursor.key_beg.delete_tid = 0;
cursor.key_beg.obj_type = 0;
cursor.key_beg.rec_type = HAMMER_RECTYPE_CONFIG;
cursor.key_beg.localization = ip->obj_localization | HAMMER_LOCALIZE_INODE;
cursor.key_beg.key = 0; /* config space page 0 */
cursor.asof = HAMMER_MAX_TID;
cursor.flags |= HAMMER_CURSOR_ASOF;
error = hammer_btree_lookup(&cursor);
if (error == 0) {
error = hammer_btree_extract_data(&cursor);
if (error == 0)
config->config = cursor.data->config;
}
/* error can be ENOENT */
config->head.error = error;
hammer_done_cursor(&cursor);
return(0);
}
/*
* Write out a new record.
*/
static
int
hammer_mirror_write(hammer_cursor_t cursor,
struct hammer_ioc_mrecord_rec *mrec,
char *udata)
{
hammer_transaction_t trans;
hammer_buffer_t data_buffer;
hammer_off_t ndata_offset;
hammer_tid_t high_tid;
void *ndata;
int error;
int doprop;
trans = cursor->trans;
data_buffer = NULL;
/*
* Get the sync lock so the whole mess is atomic
*/
hammer_sync_lock_sh(trans);
/*
* Allocate and adjust data
*/
if (mrec->leaf.data_len && mrec->leaf.data_offset) {
ndata = hammer_alloc_data(trans, mrec->leaf.data_len,
mrec->leaf.base.rec_type,
&ndata_offset, &data_buffer,
0, &error);
if (ndata == NULL)
return(error);
mrec->leaf.data_offset = ndata_offset;
hammer_modify_buffer(trans, data_buffer, NULL, 0);
error = copyin(udata, ndata, mrec->leaf.data_len);
if (error == 0) {
if (hammer_crc_test_leaf(ndata, &mrec->leaf) == 0) {
kprintf("data crc mismatch on pipe\n");
error = EINVAL;
} else {
error = hammer_mirror_localize_data(
ndata, &mrec->leaf);
}
}
hammer_modify_buffer_done(data_buffer);
} else {
mrec->leaf.data_offset = 0;
error = 0;
ndata = NULL;
}
if (error)
goto failed;
/*
* Do the insertion. This can fail with a EDEADLK or EALREADY
*/
cursor->flags |= HAMMER_CURSOR_INSERT;
error = hammer_btree_lookup(cursor);
if (error != ENOENT) {
if (error == 0)
error = EALREADY;
goto failed;
}
error = hammer_btree_insert(cursor, &mrec->leaf, &doprop);
/*
* Cursor is left on the current element, we want to skip it now.
*/
cursor->flags |= HAMMER_CURSOR_ATEDISK;
cursor->flags &= ~HAMMER_CURSOR_INSERT;
/*
* Track a count of active inodes.
*/
if (error == 0 &&
mrec->leaf.base.rec_type == HAMMER_RECTYPE_INODE &&
mrec->leaf.base.delete_tid == 0) {
hammer_modify_volume_field(trans,
trans->rootvol,
vol0_stat_inodes);
++trans->hmp->rootvol->ondisk->vol0_stat_inodes;
hammer_modify_volume_done(trans->rootvol);
}
/*
* vol0_next_tid must track the highest TID stored in the filesystem.
* We do not need to generate undo for this update.
*/
high_tid = mrec->leaf.base.create_tid;
if (high_tid < mrec->leaf.base.delete_tid)
high_tid = mrec->leaf.base.delete_tid;
if (trans->rootvol->ondisk->vol0_next_tid < high_tid) {
hammer_modify_volume(trans, trans->rootvol, NULL, 0);
trans->rootvol->ondisk->vol0_next_tid = high_tid;
hammer_modify_volume_done(trans->rootvol);
}
/*
* WARNING! cursor's leaf pointer may have changed after
* do_propagation returns.
*/
if (error == 0 && doprop)
hammer_btree_do_propagation(cursor, NULL, &mrec->leaf);
failed:
/*
* Cleanup
*/
if (error && mrec->leaf.data_offset) {
hammer_blockmap_free(cursor->trans,
mrec->leaf.data_offset,
mrec->leaf.data_len);
}
hammer_sync_unlock(trans);
if (data_buffer)
hammer_rel_buffer(data_buffer, 0);
return(error);
}
/*
* Handle B-Tree records.
*
* We must iterate to mrec->base.key (non-inclusively), and then process
* the record. We are allowed to write a new record or delete an existing
* record, but cannot replace an existing record.
*
* mirror->key_cur must be carefully set when we succeed in processing
* this mrec.
*/
static int
hammer_ioc_mirror_write_rec(hammer_cursor_t cursor,
struct hammer_ioc_mrecord_rec *mrec,
struct hammer_ioc_mirror_rw *mirror,
u_int32_t localization,
char *uptr)
{
int error;
if (mrec->leaf.data_len < 0 ||
mrec->leaf.data_len > HAMMER_XBUFSIZE ||
mrec->leaf.data_len + sizeof(*mrec) > mrec->head.rec_size) {
return(EINVAL);
}
/*
* Re-localize for target. relocalization of data is handled
* by hammer_mirror_write().
*/
mrec->leaf.base.localization &= HAMMER_LOCALIZE_MASK;
mrec->leaf.base.localization += localization;
/*
* Delete records through until we reach (non-inclusively) the
* target record.
*/
cursor->key_end = mrec->leaf.base;
cursor->flags &= ~HAMMER_CURSOR_END_INCLUSIVE;
cursor->flags |= HAMMER_CURSOR_BACKEND;
error = hammer_mirror_delete_to(cursor, mirror);
/*
* Certain records are not part of the mirroring operation
*/
if (error == 0 && hammer_mirror_nomirror(&mrec->leaf.base))
return(0);
/*
* Locate the record.
*
* If the record exists only the delete_tid may be updated.
*
* If the record does not exist we can create it only if the
* create_tid is not too old. If the create_tid is too old
* it may have already been destroyed on the slave from pruning.
*
* Note that mirror operations are effectively as-of operations
* and delete_tid can be 0 for mirroring purposes even if it is
* not actually 0 at the originator.
*
* These functions can return EDEADLK
*/
if (error == 0) {
cursor->key_beg = mrec->leaf.base;
cursor->flags |= HAMMER_CURSOR_BACKEND;
cursor->flags &= ~HAMMER_CURSOR_INSERT;
error = hammer_btree_lookup(cursor);
}
if (error == 0 && hammer_mirror_check(cursor, mrec)) {
error = hammer_mirror_update(cursor, mrec);
} else if (error == ENOENT) {
if (mrec->leaf.base.create_tid >= mirror->tid_beg) {
error = hammer_create_at_cursor(
cursor, &mrec->leaf,
uptr, HAMMER_CREATE_MODE_UMIRROR);
} else {
error = 0;
}
}
if (error == 0 || error == EALREADY)
mirror->key_cur = mrec->leaf.base;
return(error);
}
/*
* Retrieve the PFS hammer cleanup utility config record. This is
* different (newer than) the PFS config.
*
* This is kinda a hack.
*/
static
int
hammer_ioc_set_config(hammer_transaction_t trans, hammer_inode_t ip,
struct hammer_ioc_config *config)
{
struct hammer_btree_leaf_elm leaf;
struct hammer_cursor cursor;
hammer_mount_t hmp = ip->hmp;
int error;
again:
error = hammer_init_cursor(trans, &cursor, &ip->cache[0], NULL);
if (error) {
hammer_done_cursor(&cursor);
return(error);
}
bzero(&leaf, sizeof(leaf));
leaf.base.obj_id = HAMMER_OBJID_ROOT;
leaf.base.rec_type = HAMMER_RECTYPE_CONFIG;
leaf.base.create_tid = hammer_alloc_tid(hmp, 1);
leaf.base.btype = HAMMER_BTREE_TYPE_RECORD;
leaf.base.localization = ip->obj_localization | HAMMER_LOCALIZE_INODE;
leaf.base.key = 0; /* page 0 */
leaf.data_len = sizeof(struct hammer_config_data);
cursor.key_beg = leaf.base;
cursor.asof = HAMMER_MAX_TID;
cursor.flags |= HAMMER_CURSOR_BACKEND | HAMMER_CURSOR_ASOF;
error = hammer_btree_lookup(&cursor);
if (error == 0) {
error = hammer_btree_extract_data(&cursor);
error = hammer_delete_at_cursor(&cursor, HAMMER_DELETE_DESTROY,
0, 0, 0, NULL);
if (error == EDEADLK) {
hammer_done_cursor(&cursor);
goto again;
}
}
if (error == ENOENT)
error = 0;
if (error == 0) {
/*
* NOTE: Must reload key_beg after an ASOF search because
* the create_tid may have been modified during the
* search.
*/
cursor.flags &= ~HAMMER_CURSOR_ASOF;
cursor.key_beg = leaf.base;
error = hammer_create_at_cursor(&cursor, &leaf,
&config->config,
HAMMER_CREATE_MODE_SYS);
if (error == EDEADLK) {
hammer_done_cursor(&cursor);
goto again;
}
}
config->head.error = error;
hammer_done_cursor(&cursor);
return(0);
}
/*
* Delete snapshot transaction id(s) from the list of snapshots.
*/
static
int
hammer_ioc_del_snapshot(hammer_transaction_t trans, hammer_inode_t ip,
struct hammer_ioc_snapshot *snap)
{
hammer_mount_t hmp = ip->hmp;
struct hammer_cursor cursor;
int error;
/*
* Validate structure
*/
if (snap->count > HAMMER_SNAPS_PER_IOCTL)
return (EINVAL);
if (snap->index >= snap->count)
return (EINVAL);
hammer_lock_ex(&hmp->snapshot_lock);
again:
/*
* Look for keys starting after the previous iteration, or at
* the beginning if snap->count is 0.
*/
error = hammer_init_cursor(trans, &cursor, &ip->cache[0], NULL);
if (error) {
hammer_done_cursor(&cursor);
return(error);
}
cursor.key_beg.obj_id = HAMMER_OBJID_ROOT;
cursor.key_beg.create_tid = 0;
cursor.key_beg.delete_tid = 0;
cursor.key_beg.obj_type = 0;
cursor.key_beg.rec_type = HAMMER_RECTYPE_SNAPSHOT;
cursor.key_beg.localization = ip->obj_localization | HAMMER_LOCALIZE_INODE;
cursor.asof = HAMMER_MAX_TID;
cursor.flags |= HAMMER_CURSOR_ASOF;
while (snap->index < snap->count) {
cursor.key_beg.key = (int64_t)snap->snaps[snap->index].tid;
error = hammer_btree_lookup(&cursor);
if (error)
break;
error = hammer_btree_extract_leaf(&cursor);
if (error)
break;
error = hammer_delete_at_cursor(&cursor, HAMMER_DELETE_DESTROY,
0, 0, 0, NULL);
if (error == EDEADLK) {
hammer_done_cursor(&cursor);
goto again;
}
if (error)
break;
++snap->index;
}
snap->head.error = error;
hammer_done_cursor(&cursor);
hammer_unlock(&hmp->snapshot_lock);
return(0);
}
/*
* Add a snapshot transaction id(s) to the list of snapshots.
*
* NOTE: Records are created with an allocated TID. If a flush cycle
* is in progress the record may be synced in the current flush
* cycle and the volume header will reflect the allocation of the
* TID, but the synchronization point may not catch up to the
* TID until the next flush cycle.
*/
static
int
hammer_ioc_add_snapshot(hammer_transaction_t trans, hammer_inode_t ip,
struct hammer_ioc_snapshot *snap)
{
hammer_mount_t hmp = ip->hmp;
struct hammer_btree_leaf_elm leaf;
struct hammer_cursor cursor;
int error;
/*
* Validate structure
*/
if (snap->count > HAMMER_SNAPS_PER_IOCTL)
return (EINVAL);
if (snap->index >= snap->count)
return (EINVAL);
hammer_lock_ex(&hmp->snapshot_lock);
again:
/*
* Look for keys starting after the previous iteration, or at
* the beginning if snap->count is 0.
*/
error = hammer_init_cursor(trans, &cursor, &ip->cache[0], NULL);
if (error) {
hammer_done_cursor(&cursor);
return(error);
}
cursor.asof = HAMMER_MAX_TID;
cursor.flags |= HAMMER_CURSOR_BACKEND | HAMMER_CURSOR_ASOF;
bzero(&leaf, sizeof(leaf));
leaf.base.obj_id = HAMMER_OBJID_ROOT;
leaf.base.rec_type = HAMMER_RECTYPE_SNAPSHOT;
leaf.base.create_tid = hammer_alloc_tid(hmp, 1);
leaf.base.btype = HAMMER_BTREE_TYPE_RECORD;
leaf.base.localization = ip->obj_localization | HAMMER_LOCALIZE_INODE;
leaf.data_len = sizeof(struct hammer_snapshot_data);
while (snap->index < snap->count) {
leaf.base.key = (int64_t)snap->snaps[snap->index].tid;
cursor.key_beg = leaf.base;
error = hammer_btree_lookup(&cursor);
if (error == 0) {
error = EEXIST;
break;
}
/*
* NOTE: Must reload key_beg after an ASOF search because
* the create_tid may have been modified during the
* search.
*/
cursor.flags &= ~HAMMER_CURSOR_ASOF;
cursor.key_beg = leaf.base;
error = hammer_create_at_cursor(&cursor, &leaf,
&snap->snaps[snap->index],
HAMMER_CREATE_MODE_SYS);
if (error == EDEADLK) {
hammer_done_cursor(&cursor);
goto again;
}
cursor.flags |= HAMMER_CURSOR_ASOF;
if (error)
break;
++snap->index;
}
snap->head.error = error;
hammer_done_cursor(&cursor);
hammer_unlock(&hmp->snapshot_lock);
return(0);
}
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);
}
