442 строки
11 KiB
C
442 строки
11 KiB
C
/*
|
|
* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include "xfs.h"
|
|
#include "xfs_fs.h"
|
|
#include "xfs_types.h"
|
|
#include "xfs_log.h"
|
|
#include "xfs_inum.h"
|
|
#include "xfs_trans.h"
|
|
#include "xfs_trans_priv.h"
|
|
/* XXX: from here down needed until struct xfs_trans has its own ailp */
|
|
#include "xfs_bit.h"
|
|
#include "xfs_buf_item.h"
|
|
#include "xfs_sb.h"
|
|
#include "xfs_ag.h"
|
|
#include "xfs_dir2.h"
|
|
#include "xfs_dmapi.h"
|
|
#include "xfs_mount.h"
|
|
|
|
STATIC int xfs_trans_unlock_chunk(xfs_log_item_chunk_t *,
|
|
int, int, xfs_lsn_t);
|
|
|
|
/*
|
|
* 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;
|
|
lip->li_ailp = tp->t_mountp->m_ail;
|
|
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;
|
|
lip->li_ailp = tp->t_mountp->m_ail;
|
|
return lidp;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
tp->t_items_free -= XFS_LIC_NUM_SLOTS;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is called to find the descriptor corresponding to the given
|
|
* log item. It returns a pointer to the descriptor.
|
|
* The log item MUST have a corresponding descriptor in the given
|
|
* transaction. This routine does not return NULL, it panics.
|
|
*
|
|
* The descriptor pointer is kept in the log item's li_desc field.
|
|
* Just return it.
|
|
*/
|
|
/*ARGSUSED*/
|
|
xfs_log_item_desc_t *
|
|
xfs_trans_find_item(xfs_trans_t *tp, xfs_log_item_t *lip)
|
|
{
|
|
ASSERT(lip->li_desc != NULL);
|
|
|
|
return lip->li_desc;
|
|
}
|
|
|
|
|
|
/*
|
|
* Return a pointer to the first descriptor in the chunk list.
|
|
* This does not return NULL if there are none, it panics.
|
|
*
|
|
* The first descriptor must be in either the first or second chunk.
|
|
* This is because the only chunk allowed to be empty is the first.
|
|
* All others are freed when they become empty.
|
|
*
|
|
* At some point this and xfs_trans_next_item() should be optimized
|
|
* to quickly look at the mask to determine if there is anything to
|
|
* look at.
|
|
*/
|
|
xfs_log_item_desc_t *
|
|
xfs_trans_first_item(xfs_trans_t *tp)
|
|
{
|
|
xfs_log_item_chunk_t *licp;
|
|
int i;
|
|
|
|
licp = &tp->t_items;
|
|
/*
|
|
* If it's not in the first chunk, skip to the second.
|
|
*/
|
|
if (xfs_lic_are_all_free(licp)) {
|
|
licp = licp->lic_next;
|
|
}
|
|
|
|
/*
|
|
* Return the first non-free descriptor in the chunk.
|
|
*/
|
|
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);
|
|
}
|
|
cmn_err(CE_WARN, "xfs_trans_first_item() -- no first item");
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
* Given a descriptor, return the next descriptor in the chunk list.
|
|
* This returns NULL if there are no more used descriptors in the list.
|
|
*
|
|
* We do this by first locating the chunk in which the descriptor resides,
|
|
* and then scanning forward in the chunk and the list for the next
|
|
* used descriptor.
|
|
*/
|
|
/*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 */
|
|
}
|
|
|
|
/*
|
|
* This is called to unlock all of the items of a transaction and to free
|
|
* all the descriptors of that transaction.
|
|
*
|
|
* It walks the list of descriptors and unlocks each item. It frees
|
|
* each chunk except that embedded in the transaction as it goes along.
|
|
*/
|
|
void
|
|
xfs_trans_free_items(
|
|
xfs_trans_t *tp,
|
|
xfs_lsn_t commit_lsn,
|
|
int flags)
|
|
{
|
|
xfs_log_item_chunk_t *licp;
|
|
xfs_log_item_chunk_t *next_licp;
|
|
int abort;
|
|
|
|
abort = flags & XFS_TRANS_ABORT;
|
|
licp = &tp->t_items;
|
|
/*
|
|
* Special case the embedded chunk so we don't free it below.
|
|
*/
|
|
if (!xfs_lic_are_all_free(licp)) {
|
|
(void) xfs_trans_unlock_chunk(licp, 1, abort, commit_lsn);
|
|
xfs_lic_all_free(licp);
|
|
licp->lic_unused = 0;
|
|
}
|
|
licp = licp->lic_next;
|
|
|
|
/*
|
|
* Unlock each item in each chunk and free the chunks.
|
|
*/
|
|
while (licp != NULL) {
|
|
ASSERT(!xfs_lic_are_all_free(licp));
|
|
(void) xfs_trans_unlock_chunk(licp, 1, abort, commit_lsn);
|
|
next_licp = licp->lic_next;
|
|
kmem_free(licp);
|
|
licp = next_licp;
|
|
}
|
|
|
|
/*
|
|
* Reset the transaction structure's free item count.
|
|
*/
|
|
tp->t_items_free = XFS_LIC_NUM_SLOTS;
|
|
tp->t_items.lic_next = NULL;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* This is called to unlock the items associated with a transaction.
|
|
* Items which were not logged should be freed.
|
|
* Those which were logged must still be tracked so they can be unpinned
|
|
* when the transaction commits.
|
|
*/
|
|
void
|
|
xfs_trans_unlock_items(xfs_trans_t *tp, xfs_lsn_t commit_lsn)
|
|
{
|
|
xfs_log_item_chunk_t *licp;
|
|
xfs_log_item_chunk_t *next_licp;
|
|
xfs_log_item_chunk_t **licpp;
|
|
int freed;
|
|
|
|
freed = 0;
|
|
licp = &tp->t_items;
|
|
|
|
/*
|
|
* Special case the embedded chunk so we don't free.
|
|
*/
|
|
if (!xfs_lic_are_all_free(licp)) {
|
|
freed = xfs_trans_unlock_chunk(licp, 0, 0, commit_lsn);
|
|
}
|
|
licpp = &(tp->t_items.lic_next);
|
|
licp = licp->lic_next;
|
|
|
|
/*
|
|
* Unlock each item in each chunk, free non-dirty descriptors,
|
|
* and free empty chunks.
|
|
*/
|
|
while (licp != NULL) {
|
|
ASSERT(!xfs_lic_are_all_free(licp));
|
|
freed += xfs_trans_unlock_chunk(licp, 0, 0, commit_lsn);
|
|
next_licp = licp->lic_next;
|
|
if (xfs_lic_are_all_free(licp)) {
|
|
*licpp = next_licp;
|
|
kmem_free(licp);
|
|
freed -= XFS_LIC_NUM_SLOTS;
|
|
} else {
|
|
licpp = &(licp->lic_next);
|
|
}
|
|
ASSERT(*licpp == next_licp);
|
|
licp = next_licp;
|
|
}
|
|
|
|
/*
|
|
* Fix the free descriptor count in the transaction.
|
|
*/
|
|
tp->t_items_free += freed;
|
|
}
|
|
|
|
/*
|
|
* Unlock each item pointed to by a descriptor in the given chunk.
|
|
* Stamp the commit lsn into each item if necessary.
|
|
* Free descriptors pointing to items which are not dirty if freeing_chunk
|
|
* is zero. If freeing_chunk is non-zero, then we need to unlock all
|
|
* items in the chunk.
|
|
*
|
|
* Return the number of descriptors freed.
|
|
*/
|
|
STATIC int
|
|
xfs_trans_unlock_chunk(
|
|
xfs_log_item_chunk_t *licp,
|
|
int freeing_chunk,
|
|
int abort,
|
|
xfs_lsn_t commit_lsn)
|
|
{
|
|
xfs_log_item_desc_t *lidp;
|
|
xfs_log_item_t *lip;
|
|
int i;
|
|
int freed;
|
|
|
|
freed = 0;
|
|
lidp = licp->lic_descs;
|
|
for (i = 0; i < licp->lic_unused; i++, lidp++) {
|
|
if (xfs_lic_isfree(licp, i)) {
|
|
continue;
|
|
}
|
|
lip = lidp->lid_item;
|
|
lip->li_desc = NULL;
|
|
|
|
if (commit_lsn != NULLCOMMITLSN)
|
|
IOP_COMMITTING(lip, commit_lsn);
|
|
if (abort)
|
|
lip->li_flags |= XFS_LI_ABORTED;
|
|
IOP_UNLOCK(lip);
|
|
|
|
/*
|
|
* Free the descriptor if the item is not dirty
|
|
* within this transaction and the caller is not
|
|
* going to just free the entire thing regardless.
|
|
*/
|
|
if (!(freeing_chunk) &&
|
|
(!(lidp->lid_flags & XFS_LID_DIRTY) || abort)) {
|
|
xfs_lic_relse(licp, i);
|
|
freed++;
|
|
}
|
|
}
|
|
|
|
return freed;
|
|
}
|