/*
* This is called to create a new transaction which will share the
* permanent log reservation of the given transaction. The remaining
* unused block and rt extent reservations are also inherited. This
* implies that the original transaction is no longer allowed to allocate
* blocks. Locks and log items, however, are no inherited. They must
* be added to the new transaction explicitly.
*/
xfs_trans_t *
xfs_trans_dup(
xfs_trans_t *tp)
{
xfs_trans_t *ntp;
ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
/*
* Initialize the new transaction structure.
*/
ntp->t_magic = XFS_TRANS_MAGIC;
ntp->t_type = tp->t_type;
ntp->t_mountp = tp->t_mountp;
ntp->t_items_free = XFS_LIC_NUM_SLOTS;
ntp->t_busy_free = XFS_LBC_NUM_SLOTS;
XFS_LIC_INIT(&(ntp->t_items));
XFS_LBC_INIT(&(ntp->t_busy));
ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
ASSERT(tp->t_ticket != NULL);
ntp->t_flags = XFS_TRANS_PERM_LOG_RES | (tp->t_flags & XFS_TRANS_RESERVE);
ntp->t_ticket = tp->t_ticket;
ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
tp->t_blk_res = tp->t_blk_res_used;
ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
tp->t_rtx_res = tp->t_rtx_res_used;
PFLAGS_DUP(&tp->t_pflags, &ntp->t_pflags);
XFS_TRANS_DUP_DQINFO(tp->t_mountp, tp, ntp);
atomic_inc(&tp->t_mountp->m_active_trans);
return ntp;
}
xfs_trans_t *
_xfs_trans_alloc(
xfs_mount_t *mp,
uint type)
{
xfs_trans_t *tp;
atomic_inc(&mp->m_active_trans);
tp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
tp->t_magic = XFS_TRANS_MAGIC;
tp->t_type = type;
tp->t_mountp = mp;
tp->t_items_free = XFS_LIC_NUM_SLOTS;
tp->t_busy_free = XFS_LBC_NUM_SLOTS;
XFS_LIC_INIT(&(tp->t_items));
XFS_LBC_INIT(&(tp->t_busy));
return tp;
}
xfs_trans_t *
_xfs_trans_alloc(
xfs_mount_t *mp,
uint type)
{
xfs_trans_t *tp;
ASSERT(xfs_trans_zone != NULL);
tp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
/*
* Initialize the transaction structure.
*/
tp->t_magic = XFS_TRANS_MAGIC;
tp->t_type = type;
tp->t_mountp = mp;
tp->t_items_free = XFS_LIC_NUM_SLOTS;
tp->t_busy_free = XFS_LBC_NUM_SLOTS;
XFS_LIC_INIT(&(tp->t_items));
XFS_LBC_INIT(&(tp->t_busy));
return (tp);
}
void
xfs_lic_init(xfs_log_item_chunk_t *cp)
{
XFS_LIC_INIT(cp);
}
/*
* This is called to add the given log item to the transaction's
* list of log items. It must find a free log item descriptor
* or allocate a new one and add the item to that descriptor.
* The function returns a pointer to item descriptor used to point
* to the new item. The log item will now point to its new descriptor
* with its li_desc field.
*/
xfs_log_item_desc_t *
xfs_trans_add_item(xfs_trans_t *tp, xfs_log_item_t *lip)
{
xfs_log_item_desc_t *lidp;
xfs_log_item_chunk_t *licp;
int i=0;
/*
* If there are no free descriptors, allocate a new chunk
* of them and put it at the front of the chunk list.
*/
if (tp->t_items_free == 0) {
licp = (xfs_log_item_chunk_t*)
kmem_alloc(sizeof(xfs_log_item_chunk_t), KM_SLEEP);
ASSERT(licp != NULL);
/*
* Initialize the chunk, and then
* claim the first slot in the newly allocated chunk.
*/
XFS_LIC_INIT(licp);
XFS_LIC_CLAIM(licp, 0);
licp->lic_unused = 1;
XFS_LIC_INIT_SLOT(licp, 0);
lidp = XFS_LIC_SLOT(licp, 0);
/*
* Link in the new chunk and update the free count.
*/
licp->lic_next = tp->t_items.lic_next;
tp->t_items.lic_next = licp;
tp->t_items_free = XFS_LIC_NUM_SLOTS - 1;
/*
* Initialize the descriptor and the generic portion
* of the log item.
*
* Point the new slot at this item and return it.
* Also point the log item at its currently active
* descriptor and set the item's mount pointer.
*/
lidp->lid_item = lip;
lidp->lid_flags = 0;
lidp->lid_size = 0;
lip->li_desc = lidp;
lip->li_mountp = tp->t_mountp;
return lidp;
}
/*
* Find the free descriptor. It is somewhere in the chunklist
* of descriptors.
*/
licp = &tp->t_items;
while (licp != NULL) {
if (XFS_LIC_VACANCY(licp)) {
if (licp->lic_unused <= XFS_LIC_MAX_SLOT) {
i = licp->lic_unused;
ASSERT(XFS_LIC_ISFREE(licp, i));
break;
}
for (i = 0; i <= XFS_LIC_MAX_SLOT; i++) {
if (XFS_LIC_ISFREE(licp, i))
break;
}
ASSERT(i <= XFS_LIC_MAX_SLOT);
break;
}
licp = licp->lic_next;
}
ASSERT(licp != NULL);
/*
* If we find a free descriptor, claim it,
* initialize it, and return it.
*/
XFS_LIC_CLAIM(licp, i);
if (licp->lic_unused <= i) {
licp->lic_unused = i + 1;
XFS_LIC_INIT_SLOT(licp, i);
}
lidp = XFS_LIC_SLOT(licp, i);
tp->t_items_free--;
lidp->lid_item = lip;
lidp->lid_flags = 0;
lidp->lid_size = 0;
lip->li_desc = lidp;
lip->li_mountp = tp->t_mountp;
return lidp;
}
