442 lines
11 KiB
C
442 lines
11 KiB
C
/*
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* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_types.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#include "xfs_trans.h"
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#include "xfs_trans_priv.h"
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/* XXX: from here down needed until struct xfs_trans has its own ailp */
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#include "xfs_bit.h"
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#include "xfs_buf_item.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_dir2.h"
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#include "xfs_dmapi.h"
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#include "xfs_mount.h"
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STATIC int xfs_trans_unlock_chunk(xfs_log_item_chunk_t *,
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int, int, xfs_lsn_t);
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/*
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* This is called to add the given log item to the transaction's
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* list of log items. It must find a free log item descriptor
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* or allocate a new one and add the item to that descriptor.
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* The function returns a pointer to item descriptor used to point
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* to the new item. The log item will now point to its new descriptor
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* with its li_desc field.
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*/
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xfs_log_item_desc_t *
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xfs_trans_add_item(xfs_trans_t *tp, xfs_log_item_t *lip)
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{
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xfs_log_item_desc_t *lidp;
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xfs_log_item_chunk_t *licp;
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int i=0;
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/*
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* If there are no free descriptors, allocate a new chunk
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* of them and put it at the front of the chunk list.
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*/
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if (tp->t_items_free == 0) {
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licp = (xfs_log_item_chunk_t*)
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kmem_alloc(sizeof(xfs_log_item_chunk_t), KM_SLEEP);
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ASSERT(licp != NULL);
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/*
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* Initialize the chunk, and then
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* claim the first slot in the newly allocated chunk.
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*/
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xfs_lic_init(licp);
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xfs_lic_claim(licp, 0);
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licp->lic_unused = 1;
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xfs_lic_init_slot(licp, 0);
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lidp = xfs_lic_slot(licp, 0);
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/*
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* Link in the new chunk and update the free count.
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*/
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licp->lic_next = tp->t_items.lic_next;
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tp->t_items.lic_next = licp;
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tp->t_items_free = XFS_LIC_NUM_SLOTS - 1;
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/*
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* Initialize the descriptor and the generic portion
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* of the log item.
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*
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* Point the new slot at this item and return it.
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* Also point the log item at its currently active
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* descriptor and set the item's mount pointer.
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*/
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lidp->lid_item = lip;
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lidp->lid_flags = 0;
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lidp->lid_size = 0;
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lip->li_desc = lidp;
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lip->li_mountp = tp->t_mountp;
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lip->li_ailp = tp->t_mountp->m_ail;
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return lidp;
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}
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/*
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* Find the free descriptor. It is somewhere in the chunklist
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* of descriptors.
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*/
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licp = &tp->t_items;
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while (licp != NULL) {
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if (xfs_lic_vacancy(licp)) {
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if (licp->lic_unused <= XFS_LIC_MAX_SLOT) {
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i = licp->lic_unused;
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ASSERT(xfs_lic_isfree(licp, i));
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break;
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}
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for (i = 0; i <= XFS_LIC_MAX_SLOT; i++) {
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if (xfs_lic_isfree(licp, i))
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break;
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}
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ASSERT(i <= XFS_LIC_MAX_SLOT);
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break;
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}
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licp = licp->lic_next;
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}
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ASSERT(licp != NULL);
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/*
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* If we find a free descriptor, claim it,
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* initialize it, and return it.
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*/
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xfs_lic_claim(licp, i);
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if (licp->lic_unused <= i) {
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licp->lic_unused = i + 1;
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xfs_lic_init_slot(licp, i);
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}
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lidp = xfs_lic_slot(licp, i);
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tp->t_items_free--;
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lidp->lid_item = lip;
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lidp->lid_flags = 0;
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lidp->lid_size = 0;
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lip->li_desc = lidp;
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lip->li_mountp = tp->t_mountp;
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lip->li_ailp = tp->t_mountp->m_ail;
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return lidp;
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}
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/*
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* Free the given descriptor.
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*
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* This requires setting the bit in the chunk's free mask corresponding
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* to the given slot.
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*/
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void
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xfs_trans_free_item(xfs_trans_t *tp, xfs_log_item_desc_t *lidp)
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{
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uint slot;
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xfs_log_item_chunk_t *licp;
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xfs_log_item_chunk_t **licpp;
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slot = xfs_lic_desc_to_slot(lidp);
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licp = xfs_lic_desc_to_chunk(lidp);
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xfs_lic_relse(licp, slot);
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lidp->lid_item->li_desc = NULL;
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tp->t_items_free++;
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/*
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* If there are no more used items in the chunk and this is not
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* the chunk embedded in the transaction structure, then free
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* the chunk. First pull it from the chunk list and then
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* free it back to the heap. We didn't bother with a doubly
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* linked list here because the lists should be very short
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* and this is not a performance path. It's better to save
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* the memory of the extra pointer.
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*
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* Also decrement the transaction structure's count of free items
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* by the number in a chunk since we are freeing an empty chunk.
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*/
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if (xfs_lic_are_all_free(licp) && (licp != &(tp->t_items))) {
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licpp = &(tp->t_items.lic_next);
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while (*licpp != licp) {
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ASSERT(*licpp != NULL);
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licpp = &((*licpp)->lic_next);
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}
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*licpp = licp->lic_next;
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kmem_free(licp);
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tp->t_items_free -= XFS_LIC_NUM_SLOTS;
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}
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}
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/*
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* This is called to find the descriptor corresponding to the given
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* log item. It returns a pointer to the descriptor.
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* The log item MUST have a corresponding descriptor in the given
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* transaction. This routine does not return NULL, it panics.
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*
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* The descriptor pointer is kept in the log item's li_desc field.
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* Just return it.
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*/
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/*ARGSUSED*/
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xfs_log_item_desc_t *
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xfs_trans_find_item(xfs_trans_t *tp, xfs_log_item_t *lip)
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{
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ASSERT(lip->li_desc != NULL);
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return lip->li_desc;
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}
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/*
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* Return a pointer to the first descriptor in the chunk list.
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* This does not return NULL if there are none, it panics.
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*
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* The first descriptor must be in either the first or second chunk.
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* This is because the only chunk allowed to be empty is the first.
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* All others are freed when they become empty.
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*
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* At some point this and xfs_trans_next_item() should be optimized
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* to quickly look at the mask to determine if there is anything to
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* look at.
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*/
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xfs_log_item_desc_t *
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xfs_trans_first_item(xfs_trans_t *tp)
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{
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xfs_log_item_chunk_t *licp;
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int i;
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licp = &tp->t_items;
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/*
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* If it's not in the first chunk, skip to the second.
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*/
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if (xfs_lic_are_all_free(licp)) {
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licp = licp->lic_next;
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}
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/*
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* Return the first non-free descriptor in the chunk.
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*/
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ASSERT(!xfs_lic_are_all_free(licp));
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for (i = 0; i < licp->lic_unused; i++) {
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if (xfs_lic_isfree(licp, i)) {
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continue;
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}
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return xfs_lic_slot(licp, i);
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}
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cmn_err(CE_WARN, "xfs_trans_first_item() -- no first item");
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return NULL;
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}
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/*
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* Given a descriptor, return the next descriptor in the chunk list.
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* This returns NULL if there are no more used descriptors in the list.
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*
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* We do this by first locating the chunk in which the descriptor resides,
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* and then scanning forward in the chunk and the list for the next
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* used descriptor.
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*/
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/*ARGSUSED*/
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xfs_log_item_desc_t *
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xfs_trans_next_item(xfs_trans_t *tp, xfs_log_item_desc_t *lidp)
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{
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xfs_log_item_chunk_t *licp;
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int i;
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licp = xfs_lic_desc_to_chunk(lidp);
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/*
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* First search the rest of the chunk. The for loop keeps us
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* from referencing things beyond the end of the chunk.
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*/
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for (i = (int)xfs_lic_desc_to_slot(lidp) + 1; i < licp->lic_unused; i++) {
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if (xfs_lic_isfree(licp, i)) {
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continue;
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}
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return xfs_lic_slot(licp, i);
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}
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/*
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* Now search the next chunk. It must be there, because the
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* next chunk would have been freed if it were empty.
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* If there is no next chunk, return NULL.
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*/
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if (licp->lic_next == NULL) {
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return NULL;
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}
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licp = licp->lic_next;
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ASSERT(!xfs_lic_are_all_free(licp));
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for (i = 0; i < licp->lic_unused; i++) {
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if (xfs_lic_isfree(licp, i)) {
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continue;
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}
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return xfs_lic_slot(licp, i);
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}
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ASSERT(0);
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/* NOTREACHED */
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return NULL; /* keep gcc quite */
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}
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/*
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* This is called to unlock all of the items of a transaction and to free
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* all the descriptors of that transaction.
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*
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* It walks the list of descriptors and unlocks each item. It frees
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* each chunk except that embedded in the transaction as it goes along.
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*/
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void
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xfs_trans_free_items(
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xfs_trans_t *tp,
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xfs_lsn_t commit_lsn,
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int flags)
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{
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xfs_log_item_chunk_t *licp;
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xfs_log_item_chunk_t *next_licp;
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int abort;
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abort = flags & XFS_TRANS_ABORT;
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licp = &tp->t_items;
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/*
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* Special case the embedded chunk so we don't free it below.
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*/
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if (!xfs_lic_are_all_free(licp)) {
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(void) xfs_trans_unlock_chunk(licp, 1, abort, commit_lsn);
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xfs_lic_all_free(licp);
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licp->lic_unused = 0;
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}
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licp = licp->lic_next;
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/*
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* Unlock each item in each chunk and free the chunks.
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*/
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while (licp != NULL) {
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ASSERT(!xfs_lic_are_all_free(licp));
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(void) xfs_trans_unlock_chunk(licp, 1, abort, commit_lsn);
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next_licp = licp->lic_next;
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kmem_free(licp);
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licp = next_licp;
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}
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/*
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* Reset the transaction structure's free item count.
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*/
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tp->t_items_free = XFS_LIC_NUM_SLOTS;
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tp->t_items.lic_next = NULL;
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}
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/*
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* This is called to unlock the items associated with a transaction.
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* Items which were not logged should be freed.
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* Those which were logged must still be tracked so they can be unpinned
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* when the transaction commits.
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*/
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void
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xfs_trans_unlock_items(xfs_trans_t *tp, xfs_lsn_t commit_lsn)
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{
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xfs_log_item_chunk_t *licp;
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xfs_log_item_chunk_t *next_licp;
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xfs_log_item_chunk_t **licpp;
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int freed;
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freed = 0;
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licp = &tp->t_items;
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/*
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* Special case the embedded chunk so we don't free.
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*/
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if (!xfs_lic_are_all_free(licp)) {
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freed = xfs_trans_unlock_chunk(licp, 0, 0, commit_lsn);
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}
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licpp = &(tp->t_items.lic_next);
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licp = licp->lic_next;
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/*
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* Unlock each item in each chunk, free non-dirty descriptors,
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* and free empty chunks.
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*/
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while (licp != NULL) {
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ASSERT(!xfs_lic_are_all_free(licp));
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freed += xfs_trans_unlock_chunk(licp, 0, 0, commit_lsn);
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next_licp = licp->lic_next;
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if (xfs_lic_are_all_free(licp)) {
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*licpp = next_licp;
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kmem_free(licp);
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freed -= XFS_LIC_NUM_SLOTS;
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} else {
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licpp = &(licp->lic_next);
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}
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ASSERT(*licpp == next_licp);
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licp = next_licp;
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}
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/*
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* Fix the free descriptor count in the transaction.
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*/
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tp->t_items_free += freed;
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}
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/*
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* Unlock each item pointed to by a descriptor in the given chunk.
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* Stamp the commit lsn into each item if necessary.
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* Free descriptors pointing to items which are not dirty if freeing_chunk
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* is zero. If freeing_chunk is non-zero, then we need to unlock all
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* items in the chunk.
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*
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* Return the number of descriptors freed.
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*/
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STATIC int
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xfs_trans_unlock_chunk(
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xfs_log_item_chunk_t *licp,
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int freeing_chunk,
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int abort,
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xfs_lsn_t commit_lsn)
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{
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xfs_log_item_desc_t *lidp;
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xfs_log_item_t *lip;
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int i;
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int freed;
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freed = 0;
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lidp = licp->lic_descs;
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for (i = 0; i < licp->lic_unused; i++, lidp++) {
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if (xfs_lic_isfree(licp, i)) {
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continue;
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}
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lip = lidp->lid_item;
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lip->li_desc = NULL;
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if (commit_lsn != NULLCOMMITLSN)
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IOP_COMMITTING(lip, commit_lsn);
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if (abort)
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lip->li_flags |= XFS_LI_ABORTED;
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IOP_UNLOCK(lip);
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/*
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* Free the descriptor if the item is not dirty
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* within this transaction and the caller is not
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* going to just free the entire thing regardless.
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*/
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if (!(freeing_chunk) &&
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(!(lidp->lid_flags & XFS_LID_DIRTY) || abort)) {
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xfs_lic_relse(licp, i);
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freed++;
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}
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}
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return freed;
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}
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