/*ARGSUSED*/
xfs_log_item_desc_t *
xfs_trans_next_item(xfs_trans_t *tp, xfs_log_item_desc_t *lidp)
{
xfs_log_item_chunk_t *licp;
int i;
licp = XFS_LIC_DESC_TO_CHUNK(lidp);
/*
* First search the rest of the chunk. The for loop keeps us
* from referencing things beyond the end of the chunk.
*/
for (i = (int)XFS_LIC_DESC_TO_SLOT(lidp) + 1; i < licp->lic_unused; i++) {
if (XFS_LIC_ISFREE(licp, i)) {
continue;
}
return XFS_LIC_SLOT(licp, i);
}
/*
* Now search the next chunk. It must be there, because the
* next chunk would have been freed if it were empty.
* If there is no next chunk, return NULL.
*/
if (licp->lic_next == NULL) {
return NULL;
}
licp = licp->lic_next;
ASSERT(!XFS_LIC_ARE_ALL_FREE(licp));
for (i = 0; i < licp->lic_unused; i++) {
if (XFS_LIC_ISFREE(licp, i)) {
continue;
}
return XFS_LIC_SLOT(licp, i);
}
ASSERT(0);
/* NOTREACHED */
return NULL; /* keep gcc quite */
}
/*
* Free the given descriptor.
*
* This requires setting the bit in the chunk's free mask corresponding
* to the given slot.
*/
void
xfs_trans_free_item(xfs_trans_t *tp, xfs_log_item_desc_t *lidp)
{
uint slot;
xfs_log_item_chunk_t *licp;
xfs_log_item_chunk_t **licpp;
slot = XFS_LIC_DESC_TO_SLOT(lidp);
licp = XFS_LIC_DESC_TO_CHUNK(lidp);
XFS_LIC_RELSE(licp, slot);
lidp->lid_item->li_desc = NULL;
tp->t_items_free++;
/*
* If there are no more used items in the chunk and this is not
* the chunk embedded in the transaction structure, then free
* the chunk. First pull it from the chunk list and then
* free it back to the heap. We didn't bother with a doubly
* linked list here because the lists should be very short
* and this is not a performance path. It's better to save
* the memory of the extra pointer.
*
* Also decrement the transaction structure's count of free items
* by the number in a chunk since we are freeing an empty chunk.
*/
if (XFS_LIC_ARE_ALL_FREE(licp) && (licp != &(tp->t_items))) {
licpp = &(tp->t_items.lic_next);
while (*licpp != licp) {
ASSERT(*licpp != NULL);
licpp = &((*licpp)->lic_next);
}
*licpp = licp->lic_next;
kmem_free(licp, sizeof(xfs_log_item_chunk_t));
tp->t_items_free -= XFS_LIC_NUM_SLOTS;
}
}
int
xfs_lic_desc_to_slot(xfs_log_item_desc_t *dp)
{
return XFS_LIC_DESC_TO_SLOT(dp);
}
