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xfs: Clean up xfs_trans_committed code after factoring 

Now that the code has been factored, clean up all the remaining
style cruft, simplify the code and re-order functions so that it
doesn't need forward declarations.

Also move the remaining functions that require forward declarations
(xfs_trans_uncommit, xfs_trans_free) so that all the forward
declarations can be removed from the file.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner 2010-03-23 10:11:05 +11:00 committed by Alex Elder
parent 8e646a55ac
commit b1c1b5b610
1 changed files with 166 additions and 190 deletions
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356
fs/xfs/xfs_trans.c
View File

@ -45,20 +45,12 @@
#include "xfs_trans_space.h"
#include "xfs_inode_item.h"
STATIC void xfs_trans_apply_sb_deltas(xfs_trans_t *);
STATIC void xfs_trans_uncommit(xfs_trans_t *, uint);
STATIC void xfs_trans_committed(xfs_trans_t *, int);
STATIC void xfs_trans_free(xfs_trans_t *);
kmem_zone_t *xfs_trans_zone;
/*
* Reservation functions here avoid a huge stack in xfs_trans_init
* due to register overflow from temporaries in the calculations.
*/
STATIC uint
xfs_calc_write_reservation(xfs_mount_t *mp)
{
@ -257,6 +249,19 @@ _xfs_trans_alloc(
return tp;
}
/*
* Free the transaction structure. If there is more clean up
* to do when the structure is freed, add it here.
*/
STATIC void
xfs_trans_free(
xfs_trans_t *tp)
{
atomic_dec(&tp->t_mountp->m_active_trans);
xfs_trans_free_dqinfo(tp);
kmem_zone_free(xfs_trans_zone, tp);
}
/*
* This is called to create a new transaction which will share the
* permanent log reservation of the given transaction. The remaining
@ -769,7 +774,7 @@ xfs_trans_unreserve_and_mod_sb(
*/
static uint
xfs_trans_count_vecs(
xfs_trans_t *tp)
struct xfs_trans *tp)
{
int nvecs;
xfs_log_item_desc_t *lidp;
@ -860,6 +865,158 @@ xfs_trans_fill_vecs(
log_vector->i_type = XLOG_REG_TYPE_TRANSHDR;
}
/*
* The committed item processing consists of 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_item_committed(
struct xfs_log_item *lip,
xfs_lsn_t commit_lsn,
int aborted)
{
xfs_lsn_t item_lsn;
struct xfs_ail *ailp;
if (aborted)
lip->li_flags |= XFS_LI_ABORTED;
item_lsn = IOP_COMMITTED(lip, commit_lsn);
/* If the committed routine returns -1, item has been freed. */
if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
return;
/*
* 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.
*/
ailp = lip->li_ailp;
spin_lock(&ailp->xa_lock);
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_ail_update() drops the AIL lock.
*/
xfs_trans_ail_update(ailp, lip, item_lsn);
} else {
spin_unlock(&ailp->xa_lock);
}
/*
* 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);
}
/* Clear all the per-AG busy list items listed in this transaction */
static void
xfs_trans_clear_busy_extents(
struct xfs_trans *tp)
{
xfs_log_busy_chunk_t *lbcp;
xfs_log_busy_slot_t *lbsp;
int i;
for (lbcp = &tp->t_busy; lbcp != NULL; lbcp = lbcp->lbc_next) {
i = 0;
for (lbsp = lbcp->lbc_busy; i < lbcp->lbc_unused; i++, lbsp++) {
if (XFS_LBC_ISFREE(lbcp, i))
continue;
xfs_alloc_clear_busy(tp, lbsp->lbc_ag, lbsp->lbc_idx);
}
}
xfs_trans_free_busy(tp);
}
/*
* This is typically called by the LM when a transaction has been fully
* committed to disk. It needs to unpin the items which have
* been logged by the transaction and update their positions
* in the AIL if necessary.
*
* This also gets called when the transactions didn't get written out
* because of an I/O error. Abortflag & XFS_LI_ABORTED is set then.
*/
STATIC void
xfs_trans_committed(
struct xfs_trans *tp,
int abortflag)
{
xfs_log_item_desc_t *lidp;
xfs_log_item_chunk_t *licp;
xfs_log_item_chunk_t *next_licp;
/* Call the transaction's completion callback if there is one. */
if (tp->t_callback != NULL)
tp->t_callback(tp, tp->t_callarg);
for (lidp = xfs_trans_first_item(tp);
lidp != NULL;
lidp = xfs_trans_next_item(tp, lidp)) {
xfs_trans_item_committed(lidp->lid_item, tp->t_lsn, abortflag);
}
/* free the item chunks, ignoring the embedded chunk */
for (licp = tp->t_items.lic_next; licp != NULL; licp = next_licp) {
next_licp = licp->lic_next;
kmem_free(licp);
}
xfs_trans_clear_busy_extents(tp);
xfs_trans_free(tp);
}
/*
* Called from the trans_commit code when we notice that
* the filesystem is in the middle of a forced shutdown.
*/
STATIC void
xfs_trans_uncommit(
struct xfs_trans *tp,
uint flags)
{
xfs_log_item_desc_t *lidp;
for (lidp = xfs_trans_first_item(tp);
lidp != NULL;
lidp = xfs_trans_next_item(tp, lidp)) {
/*
* Unpin all but those that aren't dirty.
*/
if (lidp->lid_flags & XFS_LID_DIRTY)
IOP_UNPIN_REMOVE(lidp->lid_item, tp);
}
xfs_trans_unreserve_and_mod_sb(tp);
xfs_trans_unreserve_and_mod_dquots(tp);
xfs_trans_free_items(tp, flags);
xfs_trans_free_busy(tp);
xfs_trans_free(tp);
}
/*
* Format the transaction direct to the iclog. This isolates the physical
* transaction commit operation from the logical operation and hence allows
@ -1110,35 +1267,6 @@ out_unreserve:
return error;
}
/*
* Called from the trans_commit code when we notice that
* the filesystem is in the middle of a forced shutdown.
*/
STATIC void
xfs_trans_uncommit(
xfs_trans_t *tp,
uint flags)
{
xfs_log_item_desc_t *lidp;
for (lidp = xfs_trans_first_item(tp);
lidp != NULL;
lidp = xfs_trans_next_item(tp, lidp)) {
/*
* Unpin all but those that aren't dirty.
*/
if (lidp->lid_flags & XFS_LID_DIRTY)
IOP_UNPIN_REMOVE(lidp->lid_item, tp);
}
xfs_trans_unreserve_and_mod_sb(tp);
xfs_trans_unreserve_and_mod_dquots(tp);
xfs_trans_free_items(tp, flags);
xfs_trans_free_busy(tp);
xfs_trans_free(tp);
}
/*
* Unlock all of the transaction's items and free the transaction.
* The transaction must not have modified any of its items, because
@ -1215,20 +1343,6 @@ xfs_trans_cancel(
xfs_trans_free(tp);
}
/*
* Free the transaction structure. If there is more clean up
* to do when the structure is freed, add it here.
*/
STATIC void
xfs_trans_free(
xfs_trans_t *tp)
{
atomic_dec(&tp->t_mountp->m_active_trans);
xfs_trans_free_dqinfo(tp);
kmem_zone_free(xfs_trans_zone, tp);
}
/*
* Roll from one trans in the sequence of PERMANENT transactions to
* the next: permanent transactions are only flushed out when
@ -1298,141 +1412,3 @@ xfs_trans_roll(
xfs_trans_ihold(trans, dp);
return 0;
}
/*
* The committed item processing consists of 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_item_committed(
xfs_log_item_t *lip,
xfs_lsn_t commit_lsn,
int aborted)
{
xfs_lsn_t item_lsn;
struct xfs_ail *ailp;
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, commit_lsn);
/*
* If the committed routine returns -1, item has been freed.
*/
if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
return;
/*
* 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.
*/
ailp = lip->li_ailp;
spin_lock(&ailp->xa_lock);
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_ail_update() drops the AIL lock.
*/
xfs_trans_ail_update(ailp, lip, item_lsn);
} else {
spin_unlock(&ailp->xa_lock);
}
/*
* 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);
}
/* Clear all the per-AG busy list items listed in this transaction */
static void
xfs_trans_clear_busy_extents(
struct xfs_trans *tp)
{
xfs_log_busy_chunk_t *lbcp;
xfs_log_busy_slot_t *lbsp;
int i;
lbcp = &tp->t_busy;
while (lbcp != NULL) {
for (i = 0, lbsp = lbcp->lbc_busy; i < lbcp->lbc_unused; i++, lbsp++) {
if (!XFS_LBC_ISFREE(lbcp, i)) {
xfs_alloc_clear_busy(tp, lbsp->lbc_ag,
lbsp->lbc_idx);
}
}
lbcp = lbcp->lbc_next;
}
xfs_trans_free_busy(tp);
}
/*
* This is typically called by the LM when a transaction has been fully
* committed to disk. It needs to unpin the items which have
* been logged by the transaction and update their positions
* in the AIL if necessary.
*
* This also gets called when the transactions didn't get written out
* because of an I/O error. Abortflag & XFS_LI_ABORTED is set then.
*/
STATIC void
xfs_trans_committed(
xfs_trans_t *tp,
int abortflag)
{
xfs_log_item_desc_t *lidp;
xfs_log_item_chunk_t *licp;
xfs_log_item_chunk_t *next_licp;
/*
* Call the transaction's completion callback if there
* is one.
*/
if (tp->t_callback != NULL) {
tp->t_callback(tp, tp->t_callarg);
}
for (lidp = xfs_trans_first_item(tp);
lidp != NULL;
lidp = xfs_trans_next_item(tp, lidp)) {
xfs_trans_item_committed(lidp->lid_item, tp->t_lsn, abortflag);
}
/* free the item chunks, ignoring the embedded chunk */
licp = tp->t_items.lic_next;
while (licp != NULL) {
next_licp = licp->lic_next;
kmem_free(licp);
licp = next_licp;
}
xfs_trans_clear_busy_extents(tp);
xfs_trans_free(tp);
}