提交 33ba6129 编写于 作者: D Darrick J. Wong

xfs: connect refcount adjust functions to upper layers

Plumb in the upper level interface to schedule and finish deferred
refcount operations via the deferred ops mechanism.
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
上级 31727258
......@@ -51,6 +51,7 @@ struct xfs_defer_pending {
* find all the space it needs.
*/
enum xfs_defer_ops_type {
XFS_DEFER_OPS_TYPE_REFCOUNT,
XFS_DEFER_OPS_TYPE_RMAP,
XFS_DEFER_OPS_TYPE_FREE,
XFS_DEFER_OPS_TYPE_MAX,
......
......@@ -989,3 +989,177 @@ xfs_refcount_adjust(
error, _RET_IP_);
return error;
}
/* Clean up after calling xfs_refcount_finish_one. */
void
xfs_refcount_finish_one_cleanup(
struct xfs_trans *tp,
struct xfs_btree_cur *rcur,
int error)
{
struct xfs_buf *agbp;
if (rcur == NULL)
return;
agbp = rcur->bc_private.a.agbp;
xfs_btree_del_cursor(rcur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
if (error)
xfs_trans_brelse(tp, agbp);
}
/*
* Process one of the deferred refcount operations. We pass back the
* btree cursor to maintain our lock on the btree between calls.
* This saves time and eliminates a buffer deadlock between the
* superblock and the AGF because we'll always grab them in the same
* order.
*/
int
xfs_refcount_finish_one(
struct xfs_trans *tp,
struct xfs_defer_ops *dfops,
enum xfs_refcount_intent_type type,
xfs_fsblock_t startblock,
xfs_extlen_t blockcount,
xfs_fsblock_t *new_fsb,
xfs_extlen_t *new_len,
struct xfs_btree_cur **pcur)
{
struct xfs_mount *mp = tp->t_mountp;
struct xfs_btree_cur *rcur;
struct xfs_buf *agbp = NULL;
int error = 0;
xfs_agnumber_t agno;
xfs_agblock_t bno;
xfs_agblock_t new_agbno;
unsigned long nr_ops = 0;
int shape_changes = 0;
agno = XFS_FSB_TO_AGNO(mp, startblock);
ASSERT(agno != NULLAGNUMBER);
bno = XFS_FSB_TO_AGBNO(mp, startblock);
trace_xfs_refcount_deferred(mp, XFS_FSB_TO_AGNO(mp, startblock),
type, XFS_FSB_TO_AGBNO(mp, startblock),
blockcount);
if (XFS_TEST_ERROR(false, mp,
XFS_ERRTAG_REFCOUNT_FINISH_ONE,
XFS_RANDOM_REFCOUNT_FINISH_ONE))
return -EIO;
/*
* If we haven't gotten a cursor or the cursor AG doesn't match
* the startblock, get one now.
*/
rcur = *pcur;
if (rcur != NULL && rcur->bc_private.a.agno != agno) {
nr_ops = rcur->bc_private.a.priv.refc.nr_ops;
shape_changes = rcur->bc_private.a.priv.refc.shape_changes;
xfs_refcount_finish_one_cleanup(tp, rcur, 0);
rcur = NULL;
*pcur = NULL;
}
if (rcur == NULL) {
error = xfs_alloc_read_agf(tp->t_mountp, tp, agno,
XFS_ALLOC_FLAG_FREEING, &agbp);
if (error)
return error;
if (!agbp)
return -EFSCORRUPTED;
rcur = xfs_refcountbt_init_cursor(mp, tp, agbp, agno, dfops);
if (!rcur) {
error = -ENOMEM;
goto out_cur;
}
rcur->bc_private.a.priv.refc.nr_ops = nr_ops;
rcur->bc_private.a.priv.refc.shape_changes = shape_changes;
}
*pcur = rcur;
switch (type) {
case XFS_REFCOUNT_INCREASE:
error = xfs_refcount_adjust(rcur, bno, blockcount, &new_agbno,
new_len, XFS_REFCOUNT_ADJUST_INCREASE, dfops, NULL);
*new_fsb = XFS_AGB_TO_FSB(mp, agno, new_agbno);
break;
case XFS_REFCOUNT_DECREASE:
error = xfs_refcount_adjust(rcur, bno, blockcount, &new_agbno,
new_len, XFS_REFCOUNT_ADJUST_DECREASE, dfops, NULL);
*new_fsb = XFS_AGB_TO_FSB(mp, agno, new_agbno);
break;
default:
ASSERT(0);
error = -EFSCORRUPTED;
}
if (!error && *new_len > 0)
trace_xfs_refcount_finish_one_leftover(mp, agno, type,
bno, blockcount, new_agbno, *new_len);
return error;
out_cur:
xfs_trans_brelse(tp, agbp);
return error;
}
/*
* Record a refcount intent for later processing.
*/
static int
__xfs_refcount_add(
struct xfs_mount *mp,
struct xfs_defer_ops *dfops,
enum xfs_refcount_intent_type type,
xfs_fsblock_t startblock,
xfs_extlen_t blockcount)
{
struct xfs_refcount_intent *ri;
trace_xfs_refcount_defer(mp, XFS_FSB_TO_AGNO(mp, startblock),
type, XFS_FSB_TO_AGBNO(mp, startblock),
blockcount);
ri = kmem_alloc(sizeof(struct xfs_refcount_intent),
KM_SLEEP | KM_NOFS);
INIT_LIST_HEAD(&ri->ri_list);
ri->ri_type = type;
ri->ri_startblock = startblock;
ri->ri_blockcount = blockcount;
xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_REFCOUNT, &ri->ri_list);
return 0;
}
/*
* Increase the reference count of the blocks backing a file's extent.
*/
int
xfs_refcount_increase_extent(
struct xfs_mount *mp,
struct xfs_defer_ops *dfops,
struct xfs_bmbt_irec *PREV)
{
if (!xfs_sb_version_hasreflink(&mp->m_sb))
return 0;
return __xfs_refcount_add(mp, dfops, XFS_REFCOUNT_INCREASE,
PREV->br_startblock, PREV->br_blockcount);
}
/*
* Decrease the reference count of the blocks backing a file's extent.
*/
int
xfs_refcount_decrease_extent(
struct xfs_mount *mp,
struct xfs_defer_ops *dfops,
struct xfs_bmbt_irec *PREV)
{
if (!xfs_sb_version_hasreflink(&mp->m_sb))
return 0;
return __xfs_refcount_add(mp, dfops, XFS_REFCOUNT_DECREASE,
PREV->br_startblock, PREV->br_blockcount);
}
......@@ -41,4 +41,17 @@ struct xfs_refcount_intent {
xfs_extlen_t ri_blockcount;
};
extern int xfs_refcount_increase_extent(struct xfs_mount *mp,
struct xfs_defer_ops *dfops, struct xfs_bmbt_irec *irec);
extern int xfs_refcount_decrease_extent(struct xfs_mount *mp,
struct xfs_defer_ops *dfops, struct xfs_bmbt_irec *irec);
extern void xfs_refcount_finish_one_cleanup(struct xfs_trans *tp,
struct xfs_btree_cur *rcur, int error);
extern int xfs_refcount_finish_one(struct xfs_trans *tp,
struct xfs_defer_ops *dfops, enum xfs_refcount_intent_type type,
xfs_fsblock_t startblock, xfs_extlen_t blockcount,
xfs_fsblock_t *new_fsb, xfs_extlen_t *new_len,
struct xfs_btree_cur **pcur);
#endif /* __XFS_REFCOUNT_H__ */
......@@ -93,7 +93,8 @@ extern void xfs_verifier_error(struct xfs_buf *bp);
#define XFS_ERRTAG_FREE_EXTENT 22
#define XFS_ERRTAG_RMAP_FINISH_ONE 23
#define XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE 24
#define XFS_ERRTAG_MAX 25
#define XFS_ERRTAG_REFCOUNT_FINISH_ONE 25
#define XFS_ERRTAG_MAX 26
/*
* Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
......@@ -123,6 +124,7 @@ extern void xfs_verifier_error(struct xfs_buf *bp);
#define XFS_RANDOM_FREE_EXTENT 1
#define XFS_RANDOM_RMAP_FINISH_ONE 1
#define XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE 1
#define XFS_RANDOM_REFCOUNT_FINISH_ONE 1
#ifdef DEBUG
extern int xfs_error_test_active;
......
......@@ -396,9 +396,20 @@ xfs_cui_recover(
{
int i;
int error = 0;
unsigned int refc_type;
struct xfs_phys_extent *refc;
xfs_fsblock_t startblock_fsb;
bool op_ok;
struct xfs_cud_log_item *cudp;
struct xfs_trans *tp;
struct xfs_btree_cur *rcur = NULL;
enum xfs_refcount_intent_type type;
xfs_fsblock_t firstfsb;
xfs_fsblock_t new_fsb;
xfs_extlen_t new_len;
struct xfs_bmbt_irec irec;
struct xfs_defer_ops dfops;
bool requeue_only = false;
ASSERT(!test_bit(XFS_CUI_RECOVERED, &cuip->cui_flags));
......@@ -437,7 +448,80 @@ xfs_cui_recover(
}
}
/*
* Under normal operation, refcount updates are deferred, so we
* wouldn't be adding them directly to a transaction. All
* refcount updates manage reservation usage internally and
* dynamically by deferring work that won't fit in the
* transaction. Normally, any work that needs to be deferred
* gets attached to the same defer_ops that scheduled the
* refcount update. However, we're in log recovery here, so we
* we create our own defer_ops and use that to finish up any
* work that doesn't fit.
*/
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
if (error)
return error;
cudp = xfs_trans_get_cud(tp, cuip);
xfs_defer_init(&dfops, &firstfsb);
for (i = 0; i < cuip->cui_format.cui_nextents; i++) {
refc = &cuip->cui_format.cui_extents[i];
refc_type = refc->pe_flags & XFS_REFCOUNT_EXTENT_TYPE_MASK;
switch (refc_type) {
case XFS_REFCOUNT_INCREASE:
case XFS_REFCOUNT_DECREASE:
case XFS_REFCOUNT_ALLOC_COW:
case XFS_REFCOUNT_FREE_COW:
type = refc_type;
break;
default:
error = -EFSCORRUPTED;
goto abort_error;
}
if (requeue_only) {
new_fsb = refc->pe_startblock;
new_len = refc->pe_len;
} else
error = xfs_trans_log_finish_refcount_update(tp, cudp,
&dfops, type, refc->pe_startblock, refc->pe_len,
&new_fsb, &new_len, &rcur);
if (error)
goto abort_error;
/* Requeue what we didn't finish. */
if (new_len > 0) {
irec.br_startblock = new_fsb;
irec.br_blockcount = new_len;
switch (type) {
case XFS_REFCOUNT_INCREASE:
error = xfs_refcount_increase_extent(
tp->t_mountp, &dfops, &irec);
break;
case XFS_REFCOUNT_DECREASE:
error = xfs_refcount_decrease_extent(
tp->t_mountp, &dfops, &irec);
break;
default:
ASSERT(0);
}
if (error)
goto abort_error;
requeue_only = true;
}
}
xfs_refcount_finish_one_cleanup(tp, rcur, error);
error = xfs_defer_finish(&tp, &dfops, NULL);
if (error)
goto abort_error;
set_bit(XFS_CUI_RECOVERED, &cuip->cui_flags);
xfs_cui_release(cuip);
error = xfs_trans_commit(tp);
return error;
abort_error:
xfs_refcount_finish_one_cleanup(tp, rcur, error);
xfs_defer_cancel(&dfops);
xfs_trans_cancel(tp);
return error;
}
......@@ -1903,6 +1903,7 @@ init_xfs_fs(void)
xfs_extent_free_init_defer_op();
xfs_rmap_update_init_defer_op();
xfs_refcount_update_init_defer_op();
xfs_dir_startup();
......
......@@ -2931,6 +2931,9 @@ DEFINE_AG_ERROR_EVENT(xfs_refcount_find_right_extent_error);
DEFINE_AG_EXTENT_EVENT(xfs_refcount_find_shared);
DEFINE_AG_EXTENT_EVENT(xfs_refcount_find_shared_result);
DEFINE_AG_ERROR_EVENT(xfs_refcount_find_shared_error);
#define DEFINE_REFCOUNT_DEFERRED_EVENT DEFINE_PHYS_EXTENT_DEFERRED_EVENT
DEFINE_REFCOUNT_DEFERRED_EVENT(xfs_refcount_defer);
DEFINE_REFCOUNT_DEFERRED_EVENT(xfs_refcount_deferred);
TRACE_EVENT(xfs_refcount_finish_one_leftover,
TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno,
......
......@@ -37,6 +37,8 @@ struct xfs_rud_log_item;
struct xfs_rui_log_item;
struct xfs_btree_cur;
struct xfs_cui_log_item;
struct xfs_cud_log_item;
struct xfs_defer_ops;
typedef struct xfs_log_item {
struct list_head li_ail; /* AIL pointers */
......@@ -252,11 +254,13 @@ int xfs_trans_log_finish_rmap_update(struct xfs_trans *tp,
/* refcount updates */
enum xfs_refcount_intent_type;
void xfs_refcount_update_init_defer_op(void);
struct xfs_cud_log_item *xfs_trans_get_cud(struct xfs_trans *tp,
struct xfs_cui_log_item *cuip);
int xfs_trans_log_finish_refcount_update(struct xfs_trans *tp,
struct xfs_cud_log_item *cudp,
struct xfs_cud_log_item *cudp, struct xfs_defer_ops *dfops,
enum xfs_refcount_intent_type type, xfs_fsblock_t startblock,
xfs_extlen_t blockcount, struct xfs_btree_cur **pcur);
xfs_extlen_t blockcount, xfs_fsblock_t *new_fsb,
xfs_extlen_t *new_len, struct xfs_btree_cur **pcur);
#endif /* __XFS_TRANS_H__ */
......@@ -56,15 +56,18 @@ int
xfs_trans_log_finish_refcount_update(
struct xfs_trans *tp,
struct xfs_cud_log_item *cudp,
struct xfs_defer_ops *dop,
enum xfs_refcount_intent_type type,
xfs_fsblock_t startblock,
xfs_extlen_t blockcount,
xfs_fsblock_t *new_fsb,
xfs_extlen_t *new_len,
struct xfs_btree_cur **pcur)
{
int error;
/* XXX: leave this empty for now */
error = -EFSCORRUPTED;
error = xfs_refcount_finish_one(tp, dop, type, startblock,
blockcount, new_fsb, new_len, pcur);
/*
* Mark the transaction dirty, even on error. This ensures the
......@@ -78,3 +81,184 @@ xfs_trans_log_finish_refcount_update(
return error;
}
/* Sort refcount intents by AG. */
static int
xfs_refcount_update_diff_items(
void *priv,
struct list_head *a,
struct list_head *b)
{
struct xfs_mount *mp = priv;
struct xfs_refcount_intent *ra;
struct xfs_refcount_intent *rb;
ra = container_of(a, struct xfs_refcount_intent, ri_list);
rb = container_of(b, struct xfs_refcount_intent, ri_list);
return XFS_FSB_TO_AGNO(mp, ra->ri_startblock) -
XFS_FSB_TO_AGNO(mp, rb->ri_startblock);
}
/* Get an CUI. */
STATIC void *
xfs_refcount_update_create_intent(
struct xfs_trans *tp,
unsigned int count)
{
struct xfs_cui_log_item *cuip;
ASSERT(tp != NULL);
ASSERT(count > 0);
cuip = xfs_cui_init(tp->t_mountp, count);
ASSERT(cuip != NULL);
/*
* Get a log_item_desc to point at the new item.
*/
xfs_trans_add_item(tp, &cuip->cui_item);
return cuip;
}
/* Set the phys extent flags for this reverse mapping. */
static void
xfs_trans_set_refcount_flags(
struct xfs_phys_extent *refc,
enum xfs_refcount_intent_type type)
{
refc->pe_flags = 0;
switch (type) {
case XFS_REFCOUNT_INCREASE:
case XFS_REFCOUNT_DECREASE:
case XFS_REFCOUNT_ALLOC_COW:
case XFS_REFCOUNT_FREE_COW:
refc->pe_flags |= type;
break;
default:
ASSERT(0);
}
}
/* Log refcount updates in the intent item. */
STATIC void
xfs_refcount_update_log_item(
struct xfs_trans *tp,
void *intent,
struct list_head *item)
{
struct xfs_cui_log_item *cuip = intent;
struct xfs_refcount_intent *refc;
uint next_extent;
struct xfs_phys_extent *ext;
refc = container_of(item, struct xfs_refcount_intent, ri_list);
tp->t_flags |= XFS_TRANS_DIRTY;
cuip->cui_item.li_desc->lid_flags |= XFS_LID_DIRTY;
/*
* atomic_inc_return gives us the value after the increment;
* we want to use it as an array index so we need to subtract 1 from
* it.
*/
next_extent = atomic_inc_return(&cuip->cui_next_extent) - 1;
ASSERT(next_extent < cuip->cui_format.cui_nextents);
ext = &cuip->cui_format.cui_extents[next_extent];
ext->pe_startblock = refc->ri_startblock;
ext->pe_len = refc->ri_blockcount;
xfs_trans_set_refcount_flags(ext, refc->ri_type);
}
/* Get an CUD so we can process all the deferred refcount updates. */
STATIC void *
xfs_refcount_update_create_done(
struct xfs_trans *tp,
void *intent,
unsigned int count)
{
return xfs_trans_get_cud(tp, intent);
}
/* Process a deferred refcount update. */
STATIC int
xfs_refcount_update_finish_item(
struct xfs_trans *tp,
struct xfs_defer_ops *dop,
struct list_head *item,
void *done_item,
void **state)
{
struct xfs_refcount_intent *refc;
xfs_fsblock_t new_fsb;
xfs_extlen_t new_aglen;
int error;
refc = container_of(item, struct xfs_refcount_intent, ri_list);
error = xfs_trans_log_finish_refcount_update(tp, done_item, dop,
refc->ri_type,
refc->ri_startblock,
refc->ri_blockcount,
&new_fsb, &new_aglen,
(struct xfs_btree_cur **)state);
/* Did we run out of reservation? Requeue what we didn't finish. */
if (!error && new_aglen > 0) {
ASSERT(refc->ri_type == XFS_REFCOUNT_INCREASE ||
refc->ri_type == XFS_REFCOUNT_DECREASE);
refc->ri_startblock = new_fsb;
refc->ri_blockcount = new_aglen;
return -EAGAIN;
}
kmem_free(refc);
return error;
}
/* Clean up after processing deferred refcounts. */
STATIC void
xfs_refcount_update_finish_cleanup(
struct xfs_trans *tp,
void *state,
int error)
{
struct xfs_btree_cur *rcur = state;
xfs_refcount_finish_one_cleanup(tp, rcur, error);
}
/* Abort all pending CUIs. */
STATIC void
xfs_refcount_update_abort_intent(
void *intent)
{
xfs_cui_release(intent);
}
/* Cancel a deferred refcount update. */
STATIC void
xfs_refcount_update_cancel_item(
struct list_head *item)
{
struct xfs_refcount_intent *refc;
refc = container_of(item, struct xfs_refcount_intent, ri_list);
kmem_free(refc);
}
static const struct xfs_defer_op_type xfs_refcount_update_defer_type = {
.type = XFS_DEFER_OPS_TYPE_REFCOUNT,
.max_items = XFS_CUI_MAX_FAST_EXTENTS,
.diff_items = xfs_refcount_update_diff_items,
.create_intent = xfs_refcount_update_create_intent,
.abort_intent = xfs_refcount_update_abort_intent,
.log_item = xfs_refcount_update_log_item,
.create_done = xfs_refcount_update_create_done,
.finish_item = xfs_refcount_update_finish_item,
.finish_cleanup = xfs_refcount_update_finish_cleanup,
.cancel_item = xfs_refcount_update_cancel_item,
};
/* Register the deferred op type. */
void
xfs_refcount_update_init_defer_op(void)
{
xfs_defer_init_op_type(&xfs_refcount_update_defer_type);
}
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册