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xfs: get rid of the log item descriptor

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It's just a connector between a transaction and a log item. There's
a 1:1 relationship between a log item descriptor and a log item,
and a 1:1 relationship between a log item descriptor and a
transaction. Both relationships are created and terminated at the
same time, so why do we even have the descriptor?

Replace it with a specific list_head in the log item and a new
log item dirtied flag to replace the XFS_LID_DIRTY flag.

Signed-Off-By: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
[darrick: fix up deferred agfl intent finish_item use of LID_DIRTY]
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Dave Chinner 2018-05-09 07:49:37 -07:00 • committed by Darrick J. Wong
parent 1a2ebf835a
commit e6631f8554
18 changed files with 63 additions and 124 deletions
Download patch file Download diff file Expand all files Collapse all files

58
fs/xfs/xfs_trans.c
View file

@ -34,7 +34,6 @@
#include "xfs_defer.h"
kmem_zone_t *xfs_trans_zone;
kmem_zone_t *xfs_log_item_desc_zone;
#if defined(CONFIG_TRACEPOINTS)
static void
@ -734,77 +733,52 @@ out:
return;
}
/*
* Add the given log item to the transaction's list of log items.
*
* The log item will now point to its new descriptor with its li_desc field.
*/
/* Add the given log item to the transaction's list of log items. */
void
xfs_trans_add_item(
struct xfs_trans *tp,
struct xfs_log_item *lip)
{
struct xfs_log_item_desc *lidp;
ASSERT(lip->li_mountp == tp->t_mountp);
ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
ASSERT(list_empty(&lip->li_trans));
ASSERT(!test_bit(XFS_LI_DIRTY, &lip->li_flags));
lidp = kmem_zone_zalloc(xfs_log_item_desc_zone, KM_SLEEP | KM_NOFS);
lidp->lid_item = lip;
lidp->lid_flags = 0;
list_add_tail(&lidp->lid_trans, &tp->t_items);
lip->li_desc = lidp;
list_add_tail(&lip->li_trans, &tp->t_items);
trace_xfs_trans_add_item(tp, _RET_IP_);
}
STATIC void
xfs_trans_free_item_desc(
struct xfs_log_item_desc *lidp)
{
list_del_init(&lidp->lid_trans);
kmem_zone_free(xfs_log_item_desc_zone, lidp);
}
/*
* Unlink and free the given descriptor.
* Unlink the log item from the transaction. the log item is no longer
* considered dirty in this transaction, as the linked transaction has
* finished, either by abort or commit completion.
*/
void
xfs_trans_del_item(
struct xfs_log_item *lip)
{
xfs_trans_free_item_desc(lip->li_desc);
lip->li_desc = NULL;
clear_bit(XFS_LI_DIRTY, &lip->li_flags);
list_del_init(&lip->li_trans);
}
/*
* Unlock all of the items of a transaction and free all the descriptors
* of that transaction.
*/
/* Detach and unlock all of the items in a transaction */
void
xfs_trans_free_items(
struct xfs_trans *tp,
xfs_lsn_t commit_lsn,
bool abort)
{
struct xfs_log_item_desc *lidp, *next;
struct xfs_log_item *lip, *next;
trace_xfs_trans_free_items(tp, _RET_IP_);
list_for_each_entry_safe(lidp, next, &tp->t_items, lid_trans) {
struct xfs_log_item *lip = lidp->lid_item;
lip->li_desc = NULL;
list_for_each_entry_safe(lip, next, &tp->t_items, li_trans) {
xfs_trans_del_item(lip);
if (commit_lsn != NULLCOMMITLSN)
lip->li_ops->iop_committing(lip, commit_lsn);
if (abort)
set_bit(XFS_LI_ABORTED, &lip->li_flags);
lip->li_ops->iop_unlock(lip);
xfs_trans_free_item_desc(lidp);
}
}
@ -1052,10 +1026,10 @@ xfs_trans_cancel(
}
#ifdef DEBUG
if (!dirty && !XFS_FORCED_SHUTDOWN(mp)) {
struct xfs_log_item_desc *lidp;
struct xfs_log_item *lip;
list_for_each_entry(lidp, &tp->t_items, lid_trans)
ASSERT(!(lidp->lid_item->li_type == XFS_LI_EFD));
list_for_each_entry(lip, &tp->t_items, li_trans)
ASSERT(!(lip->li_type == XFS_LI_EFD));
}
#endif
xfs_trans_unreserve_and_mod_sb(tp);