/*
* This is called by the efd item code below to release references to
* the given efi item. Each efd calls this with the number of
* extents that it has logged, and when the sum of these reaches
* the total number of extents logged by this efi item we can free
* the efi item.
*
* Freeing the efi item requires that we remove it from the AIL.
* We'll use the AIL lock to protect our counters as well as
* the removal from the AIL.
*/
void
xfs_efi_release(xfs_efi_log_item_t *efip,
uint nextents)
{
xfs_mount_t *mp;
int extents_left;
SPLDECL(s);
mp = efip->efi_item.li_mountp;
ASSERT(efip->efi_next_extent > 0);
ASSERT(efip->efi_flags & XFS_EFI_COMMITTED);
AIL_LOCK(mp, s);
ASSERT(efip->efi_next_extent >= nextents);
efip->efi_next_extent -= nextents;
extents_left = efip->efi_next_extent;
if (extents_left == 0) {
/*
* xfs_trans_delete_ail() drops the AIL lock.
*/
xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
xfs_efi_item_free(efip);
} else {
AIL_UNLOCK(mp, s);
}
}
/*
* This is called when the transaction that should be committing the
* EFD corresponding to the given EFI is aborted. The committed and
* canceled flags are used to coordinate the freeing of the EFI and
* the references by the transaction that committed it.
*/
STATIC void
xfs_efi_cancel(
xfs_efi_log_item_t *efip)
{
int nexts;
int size;
xfs_mount_t *mp;
SPLDECL(s);
mp = efip->efi_item.li_mountp;
AIL_LOCK(mp, s);
if (efip->efi_flags & XFS_EFI_COMMITTED) {
/*
* xfs_trans_delete_ail() drops the AIL lock.
*/
xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
nexts = efip->efi_format.efi_nextents;
if (nexts > XFS_EFI_MAX_FAST_EXTENTS) {
size = sizeof(xfs_efi_log_item_t);
size += (nexts - 1) * sizeof(xfs_extent_t);
kmem_free(efip, size);
} else {
kmem_zone_free(xfs_efi_zone, efip);
}
} else {
efip->efi_flags |= XFS_EFI_CANCELED;
AIL_UNLOCK(mp, s);
}
return;
}
/*
* like unpin only we have to also clear the xaction descriptor
* pointing the log item if we free the item. This routine duplicates
* unpin because efi_flags is protected by the AIL lock. Freeing
* the descriptor and then calling unpin would force us to drop the AIL
* lock which would open up a race condition.
*/
STATIC void
xfs_efi_item_unpin_remove(xfs_efi_log_item_t *efip, xfs_trans_t *tp)
{
xfs_mount_t *mp;
xfs_log_item_desc_t *lidp;
SPLDECL(s);
mp = efip->efi_item.li_mountp;
AIL_LOCK(mp, s);
if (efip->efi_flags & XFS_EFI_CANCELED) {
/*
* free the xaction descriptor pointing to this item
*/
lidp = xfs_trans_find_item(tp, (xfs_log_item_t *) efip);
xfs_trans_free_item(tp, lidp);
/*
* pull the item off the AIL.
* xfs_trans_delete_ail() drops the AIL lock.
*/
xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
xfs_efi_item_free(efip);
} else {
efip->efi_flags |= XFS_EFI_COMMITTED;
AIL_UNLOCK(mp, s);
}
}
/*
* Delete the given item from the AIL. It must already be in
* the AIL.
*
* Wakeup anyone with an lsn less than item's lsn. If the item
* we delete in the AIL is the minimum one, update the tail lsn in the
* log manager.
*
* Clear the IN_AIL flag from the item, reset its lsn to 0, and
* bump the AIL's generation count to indicate that the tree
* has changed.
*
* This function must be called with the AIL lock held. The lock
* is dropped before returning, so the caller must pass in the
* cookie returned by AIL_LOCK.
*/
void
xfs_trans_delete_ail(
xfs_mount_t *mp,
xfs_log_item_t *lip,
unsigned long s)
{
xfs_ail_entry_t *ailp;
xfs_log_item_t *dlip;
xfs_log_item_t *mlip;
if (lip->li_flags & XFS_LI_IN_AIL) {
ailp = &(mp->m_ail);
mlip = xfs_ail_min(ailp);
dlip = xfs_ail_delete(ailp, lip);
ASSERT(dlip == lip);
lip->li_flags &= ~XFS_LI_IN_AIL;
lip->li_lsn = 0;
mp->m_ail_gen++;
if (mlip == dlip) {
mlip = xfs_ail_min(&(mp->m_ail));
AIL_UNLOCK(mp, s);
xfs_log_move_tail(mp, (mlip ? mlip->li_lsn : 0));
} else {
AIL_UNLOCK(mp, s);
}
}
else {
/*
* If the file system is not being shutdown, we are in
* serious trouble if we get to this stage.
*/
if (XFS_FORCED_SHUTDOWN(mp))
AIL_UNLOCK(mp, s);
else {
xfs_cmn_err(XFS_PTAG_AILDELETE, CE_ALERT, mp,
"%s: attempting to delete a log item that is not in the AIL",
__FUNCTION__);
AIL_UNLOCK(mp, s);
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
}
}
}
/*
* Update the position of the item in the AIL with the new
* lsn. If it is not yet in the AIL, add it. Otherwise, move
* it to its new position by removing it and re-adding it.
*
* Wakeup anyone with an lsn less than the item's lsn. If the item
* we move in the AIL is the minimum one, update the tail lsn in the
* log manager.
*
* Increment the AIL's generation count to indicate that the tree
* has changed.
*
* This function must be called with the AIL lock held. The lock
* is dropped before returning, so the caller must pass in the
* cookie returned by AIL_LOCK.
*/
void
xfs_trans_update_ail(
xfs_mount_t *mp,
xfs_log_item_t *lip,
xfs_lsn_t lsn,
unsigned long s)
{
xfs_ail_entry_t *ailp;
xfs_log_item_t *dlip=NULL;
xfs_log_item_t *mlip; /* ptr to minimum lip */
ailp = &(mp->m_ail);
mlip = xfs_ail_min(ailp);
if (lip->li_flags & XFS_LI_IN_AIL) {
dlip = xfs_ail_delete(ailp, lip);
ASSERT(dlip == lip);
} else {
lip->li_flags |= XFS_LI_IN_AIL;
}
lip->li_lsn = lsn;
xfs_ail_insert(ailp, lip);
mp->m_ail_gen++;
if (mlip == dlip) {
mlip = xfs_ail_min(&(mp->m_ail));
AIL_UNLOCK(mp, s);
xfs_log_move_tail(mp, mlip->li_lsn);
} else {
AIL_UNLOCK(mp, s);
}
} /* xfs_trans_update_ail */
/*ARGSUSED*/
void
xfs_iflush_done(
xfs_buf_t *bp,
xfs_inode_log_item_t *iip)
{
xfs_inode_t *ip;
SPLDECL(s);
ip = iip->ili_inode;
/*
* We only want to pull the item from the AIL if it is
* actually there and its location in the log has not
* changed since we started the flush. Thus, we only bother
* if the ili_logged flag is set and the inode's lsn has not
* changed. First we check the lsn outside
* the lock since it's cheaper, and then we recheck while
* holding the lock before removing the inode from the AIL.
*/
if (iip->ili_logged &&
(iip->ili_item.li_lsn == iip->ili_flush_lsn)) {
AIL_LOCK(ip->i_mount, s);
if (iip->ili_item.li_lsn == iip->ili_flush_lsn) {
/*
* xfs_trans_delete_ail() drops the AIL lock.
*/
xfs_trans_delete_ail(ip->i_mount,
(xfs_log_item_t*)iip, s);
} else {
AIL_UNLOCK(ip->i_mount, s);
}
}
iip->ili_logged = 0;
/*
* Clear the ili_last_fields bits now that we know that the
* data corresponding to them is safely on disk.
*/
iip->ili_last_fields = 0;
/*
* Release the inode's flush lock since we're done with it.
*/
xfs_ifunlock(ip);
return;
}
/*ARGSUSED*/
STATIC void
xfs_efi_item_unpin(xfs_efi_log_item_t *efip, int stale)
{
xfs_mount_t *mp;
SPLDECL(s);
mp = efip->efi_item.li_mountp;
AIL_LOCK(mp, s);
if (efip->efi_flags & XFS_EFI_CANCELED) {
/*
* xfs_trans_delete_ail() drops the AIL lock.
*/
xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
xfs_efi_item_free(efip);
} else {
efip->efi_flags |= XFS_EFI_COMMITTED;
AIL_UNLOCK(mp, s);
}
}
/*
* This is called by the log manager code to determine the LSN
* of the tail of the log. This is exactly the LSN of the first
* item in the AIL. If the AIL is empty, then this function
* returns 0.
*
* We need the AIL lock in order to get a coherent read of the
* lsn of the last item in the AIL.
*/
xfs_lsn_t
xfs_trans_tail_ail(
xfs_mount_t *mp)
{
xfs_lsn_t lsn;
xfs_log_item_t *lip;
SPLDECL(s);
AIL_LOCK(mp,s);
lip = xfs_ail_min(&(mp->m_ail));
if (lip == NULL) {
lsn = (xfs_lsn_t)0;
} else {
lsn = lip->li_lsn;
}
AIL_UNLOCK(mp, s);
return lsn;
}
/*
* like unpin only we have to also clear the xaction descriptor
* pointing the log item if we free the item. This routine duplicates
* unpin because efi_flags is protected by the AIL lock. Freeing
* the descriptor and then calling unpin would force us to drop the AIL
* lock which would open up a race condition.
*/
STATIC void
xfs_efi_item_unpin_remove(xfs_efi_log_item_t *efip, xfs_trans_t *tp)
{
int nexts;
int size;
xfs_mount_t *mp;
xfs_log_item_desc_t *lidp;
SPLDECL(s);
mp = efip->efi_item.li_mountp;
AIL_LOCK(mp, s);
if (efip->efi_flags & XFS_EFI_CANCELED) {
/*
* free the xaction descriptor pointing to this item
*/
lidp = xfs_trans_find_item(tp, (xfs_log_item_t *) efip);
xfs_trans_free_item(tp, lidp);
/*
* pull the item off the AIL.
* xfs_trans_delete_ail() drops the AIL lock.
*/
xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
/*
* now free the item itself
*/
nexts = efip->efi_format.efi_nextents;
if (nexts > XFS_EFI_MAX_FAST_EXTENTS) {
size = sizeof(xfs_efi_log_item_t);
size += (nexts - 1) * sizeof(xfs_extent_t);
kmem_free(efip, size);
} else {
kmem_zone_free(xfs_efi_zone, efip);
}
} else {
efip->efi_flags |= XFS_EFI_COMMITTED;
AIL_UNLOCK(mp, s);
}
return;
}
/*
* This is the inode flushing abort routine. It is called
* from xfs_iflush when the filesystem is shutting down to clean
* up the inode state.
* It is responsible for removing the inode item
* from the AIL if it has not been re-logged, and unlocking the inode's
* flush lock.
*/
void
xfs_iflush_abort(
xfs_inode_t *ip)
{
xfs_inode_log_item_t *iip;
xfs_mount_t *mp;
SPLDECL(s);
iip = ip->i_itemp;
mp = ip->i_mount;
if (iip) {
if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
AIL_LOCK(mp, s);
if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
/*
* xfs_trans_delete_ail() drops the AIL lock.
*/
xfs_trans_delete_ail(mp, (xfs_log_item_t *)iip,
s);
} else
AIL_UNLOCK(mp, s);
}
iip->ili_logged = 0;
/*
* Clear the ili_last_fields bits now that we know that the
* data corresponding to them is safely on disk.
*/
iip->ili_last_fields = 0;
/*
* Clear the inode logging fields so no more flushes are
* attempted.
*/
iip->ili_format.ilf_fields = 0;
}
/*
* Release the inode's flush lock since we're done with it.
*/
xfs_ifunlock(ip);
}
/*
* This is called by the efd item code below to release references to
* the given efi item. Each efd calls this with the number of
* extents that it has logged, and when the sum of these reaches
* the total number of extents logged by this efi item we can free
* the efi item.
*
* Freeing the efi item requires that we remove it from the AIL.
* We'll use the AIL lock to protect our counters as well as
* the removal from the AIL.
*/
void
xfs_efi_release(xfs_efi_log_item_t *efip,
uint nextents)
{
xfs_mount_t *mp;
int extents_left;
uint size;
int nexts;
SPLDECL(s);
mp = efip->efi_item.li_mountp;
ASSERT(efip->efi_next_extent > 0);
ASSERT(efip->efi_flags & XFS_EFI_COMMITTED);
AIL_LOCK(mp, s);
ASSERT(efip->efi_next_extent >= nextents);
efip->efi_next_extent -= nextents;
extents_left = efip->efi_next_extent;
if (extents_left == 0) {
/*
* xfs_trans_delete_ail() drops the AIL lock.
*/
xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
} else {
AIL_UNLOCK(mp, s);
}
if (extents_left == 0) {
nexts = efip->efi_format.efi_nextents;
if (nexts > XFS_EFI_MAX_FAST_EXTENTS) {
size = sizeof(xfs_efi_log_item_t);
size += (nexts - 1) * sizeof(xfs_extent_t);
kmem_free(efip, size);
} else {
kmem_zone_free(xfs_efi_zone, efip);
}
}
}
/*ARGSUSED*/
STATIC void
xfs_qm_dqflush_done(
xfs_buf_t *bp,
xfs_dq_logitem_t *qip)
{
xfs_dquot_t *dqp;
SPLDECL(s);
dqp = qip->qli_dquot;
/*
* We only want to pull the item from the AIL if its
* location in the log has not changed since we started the flush.
* Thus, we only bother if the dquot's lsn has
* not changed. First we check the lsn outside the lock
* since it's cheaper, and then we recheck while
* holding the lock before removing the dquot from the AIL.
*/
if ((qip->qli_item.li_flags & XFS_LI_IN_AIL) &&
qip->qli_item.li_lsn == qip->qli_flush_lsn) {
AIL_LOCK(dqp->q_mount, s);
/*
* xfs_trans_delete_ail() drops the AIL lock.
*/
if (qip->qli_item.li_lsn == qip->qli_flush_lsn)
xfs_trans_delete_ail(dqp->q_mount,
(xfs_log_item_t*)qip, s);
else
AIL_UNLOCK(dqp->q_mount, s);
}
/*
* Release the dq's flush lock since we're done with it.
*/
xfs_dqfunlock(dqp);
}
/*
* This is called to perform the commit processing for each
* item described by the given chunk.
*
* The commit processing consists of unlocking items which were
* held locked with the SYNC_UNLOCK attribute, calling the committed
* routine of each logged item, updating the item's position in the AIL
* if necessary, and unpinning each item. If the committed routine
* returns -1, then do nothing further with the item because it
* may have been freed.
*
* Since items are unlocked when they are copied to the incore
* log, it is possible for two transactions to be completing
* and manipulating the same item simultaneously. The AIL lock
* will protect the lsn field of each item. The value of this
* field can never go backwards.
*
* We unpin the items after repositioning them in the AIL, because
* otherwise they could be immediately flushed and we'd have to race
* with the flusher trying to pull the item from the AIL as we add it.
*/
STATIC void
xfs_trans_chunk_committed(
xfs_log_item_chunk_t *licp,
xfs_lsn_t lsn,
int aborted)
{
xfs_log_item_desc_t *lidp;
xfs_log_item_t *lip;
xfs_lsn_t item_lsn;
struct xfs_mount *mp;
int i;
SPLDECL(s);
lidp = licp->lic_descs;
for (i = 0; i < licp->lic_unused; i++, lidp++) {
if (XFS_LIC_ISFREE(licp, i)) {
continue;
}
lip = lidp->lid_item;
if (aborted)
lip->li_flags |= XFS_LI_ABORTED;
/*
* Send in the ABORTED flag to the COMMITTED routine
* so that it knows whether the transaction was aborted
* or not.
*/
item_lsn = IOP_COMMITTED(lip, lsn);
/*
* If the committed routine returns -1, make
* no more references to the item.
*/
if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0) {
continue;
}
/*
* If the returned lsn is greater than what it
* contained before, update the location of the
* item in the AIL. If it is not, then do nothing.
* Items can never move backwards in the AIL.
*
* While the new lsn should usually be greater, it
* is possible that a later transaction completing
* simultaneously with an earlier one using the
* same item could complete first with a higher lsn.
* This would cause the earlier transaction to fail
* the test below.
*/
mp = lip->li_mountp;
AIL_LOCK(mp,s);
if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0) {
/*
* This will set the item's lsn to item_lsn
* and update the position of the item in
* the AIL.
*
* xfs_trans_update_ail() drops the AIL lock.
*/
xfs_trans_update_ail(mp, lip, item_lsn, s);
} else {
AIL_UNLOCK(mp, s);
}
/*
* Now that we've repositioned the item in the AIL,
* unpin it so it can be flushed. Pass information
* about buffer stale state down from the log item
* flags, if anyone else stales the buffer we do not
* want to pay any attention to it.
*/
IOP_UNPIN(lip, lidp->lid_flags & XFS_LID_BUF_STALE);
}
}
/*
* Write a modified dquot to disk.
* The dquot must be locked and the flush lock too taken by caller.
* The flush lock will not be unlocked until the dquot reaches the disk,
* but the dquot is free to be unlocked and modified by the caller
* in the interim. Dquot is still locked on return. This behavior is
* identical to that of inodes.
*/
int
xfs_qm_dqflush(
xfs_dquot_t *dqp,
uint flags)
{
xfs_mount_t *mp;
xfs_buf_t *bp;
xfs_disk_dquot_t *ddqp;
int error;
SPLDECL(s);
ASSERT(XFS_DQ_IS_LOCKED(dqp));
ASSERT(XFS_DQ_IS_FLUSH_LOCKED(dqp));
xfs_dqtrace_entry(dqp, "DQFLUSH");
/*
* If not dirty, nada.
*/
if (!XFS_DQ_IS_DIRTY(dqp)) {
xfs_dqfunlock(dqp);
return (0);
}
/*
* Cant flush a pinned dquot. Wait for it.
*/
xfs_qm_dqunpin_wait(dqp);
/*
* This may have been unpinned because the filesystem is shutting
* down forcibly. If that's the case we must not write this dquot
* to disk, because the log record didn't make it to disk!
*/
if (XFS_FORCED_SHUTDOWN(dqp->q_mount)) {
dqp->dq_flags &= ~(XFS_DQ_DIRTY);
xfs_dqfunlock(dqp);
return XFS_ERROR(EIO);
}
/*
* Get the buffer containing the on-disk dquot
* We don't need a transaction envelope because we know that the
* the ondisk-dquot has already been allocated for.
*/
if ((error = xfs_qm_dqtobp(NULL, dqp, &ddqp, &bp, XFS_QMOPT_DOWARN))) {
xfs_dqtrace_entry(dqp, "DQTOBP FAIL");
ASSERT(error != ENOENT);
/*
* Quotas could have gotten turned off (ESRCH)
*/
xfs_dqfunlock(dqp);
return (error);
}
if (xfs_qm_dqcheck(&dqp->q_core, be32_to_cpu(ddqp->d_id),
0, XFS_QMOPT_DOWARN, "dqflush (incore copy)")) {
xfs_force_shutdown(dqp->q_mount, XFS_CORRUPT_INCORE);
return XFS_ERROR(EIO);
}
/* This is the only portion of data that needs to persist */
memcpy(ddqp, &(dqp->q_core), sizeof(xfs_disk_dquot_t));
/*
* Clear the dirty field and remember the flush lsn for later use.
*/
dqp->dq_flags &= ~(XFS_DQ_DIRTY);
mp = dqp->q_mount;
/* lsn is 64 bits */
AIL_LOCK(mp, s);
dqp->q_logitem.qli_flush_lsn = dqp->q_logitem.qli_item.li_lsn;
AIL_UNLOCK(mp, s);
/*
* Attach an iodone routine so that we can remove this dquot from the
* AIL and release the flush lock once the dquot is synced to disk.
*/
xfs_buf_attach_iodone(bp, (void(*)(xfs_buf_t *, xfs_log_item_t *))
xfs_qm_dqflush_done, &(dqp->q_logitem.qli_item));
/*
* If the buffer is pinned then push on the log so we won't
* get stuck waiting in the write for too long.
*/
if (XFS_BUF_ISPINNED(bp)) {
xfs_dqtrace_entry(dqp, "DQFLUSH LOG FORCE");
xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
}
if (flags & XFS_QMOPT_DELWRI) {
xfs_bdwrite(mp, bp);
} else if (flags & XFS_QMOPT_ASYNC) {
xfs_bawrite(mp, bp);
} else {
error = xfs_bwrite(mp, bp);
}
xfs_dqtrace_entry(dqp, "DQFLUSH END");
/*
* dqp is still locked, but caller is free to unlock it now.
*/
return (error);
}
/*
* xfs_trans_push_ail
*
* This routine is called to move the tail of the AIL
* forward. It does this by trying to flush items in the AIL
* whose lsns are below the given threshold_lsn.
*
* The routine returns the lsn of the tail of the log.
*/
xfs_lsn_t
xfs_trans_push_ail(
xfs_mount_t *mp,
xfs_lsn_t threshold_lsn)
{
xfs_lsn_t lsn;
xfs_log_item_t *lip;
int gen;
int restarts;
int lock_result;
int flush_log;
SPLDECL(s);
#define XFS_TRANS_PUSH_AIL_RESTARTS 10
AIL_LOCK(mp,s);
lip = xfs_trans_first_ail(mp, &gen);
if (lip == NULL || XFS_FORCED_SHUTDOWN(mp)) {
/*
* Just return if the AIL is empty.
*/
AIL_UNLOCK(mp, s);
return (xfs_lsn_t)0;
}
XFS_STATS_INC(xs_push_ail);
/*
* While the item we are looking at is below the given threshold
* try to flush it out. Make sure to limit the number of times
* we allow xfs_trans_next_ail() to restart scanning from the
* beginning of the list. We'd like not to stop until we've at least
* tried to push on everything in the AIL with an LSN less than
* the given threshold. However, we may give up before that if
* we realize that we've been holding the AIL_LOCK for 'too long',
* blocking interrupts. Currently, too long is < 500us roughly.
*/
flush_log = 0;
restarts = 0;
while (((restarts < XFS_TRANS_PUSH_AIL_RESTARTS) &&
(XFS_LSN_CMP(lip->li_lsn, threshold_lsn) < 0))) {
/*
* If we can lock the item without sleeping, unlock
* the AIL lock and flush the item. Then re-grab the
* AIL lock so we can look for the next item on the
* AIL. Since we unlock the AIL while we flush the
* item, the next routine may start over again at the
* the beginning of the list if anything has changed.
* That is what the generation count is for.
*
* If we can't lock the item, either its holder will flush
* it or it is already being flushed or it is being relogged.
* In any of these case it is being taken care of and we
* can just skip to the next item in the list.
*/
lock_result = IOP_TRYLOCK(lip);
switch (lock_result) {
case XFS_ITEM_SUCCESS:
AIL_UNLOCK(mp, s);
XFS_STATS_INC(xs_push_ail_success);
IOP_PUSH(lip);
AIL_LOCK(mp,s);
break;
case XFS_ITEM_PUSHBUF:
AIL_UNLOCK(mp, s);
XFS_STATS_INC(xs_push_ail_pushbuf);
#ifdef XFSRACEDEBUG
delay_for_intr();
delay(300);
#endif
ASSERT(lip->li_ops->iop_pushbuf);
ASSERT(lip);
IOP_PUSHBUF(lip);
AIL_LOCK(mp,s);
break;
case XFS_ITEM_PINNED:
XFS_STATS_INC(xs_push_ail_pinned);
flush_log = 1;
break;
case XFS_ITEM_LOCKED:
XFS_STATS_INC(xs_push_ail_locked);
break;
case XFS_ITEM_FLUSHING:
XFS_STATS_INC(xs_push_ail_flushing);
break;
default:
ASSERT(0);
break;
}
lip = xfs_trans_next_ail(mp, lip, &gen, &restarts);
if (lip == NULL) {
break;
}
if (XFS_FORCED_SHUTDOWN(mp)) {
/*
* Just return if we shut down during the last try.
*/
AIL_UNLOCK(mp, s);
return (xfs_lsn_t)0;
}
}
if (flush_log) {
/*
* If something we need to push out was pinned, then
* push out the log so it will become unpinned and
* move forward in the AIL.
*/
AIL_UNLOCK(mp, s);
XFS_STATS_INC(xs_push_ail_flush);
xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
AIL_LOCK(mp, s);
}
lip = xfs_ail_min(&(mp->m_ail));
if (lip == NULL) {
lsn = (xfs_lsn_t)0;
} else {
lsn = lip->li_lsn;
}
AIL_UNLOCK(mp, s);
return lsn;
} /* xfs_trans_push_ail */
