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xfs: convert the dquot hash list to use list heads 

Convert the dquot hash list on the filesystem to use listhead
infrastructure rather than the roll-your-own in the quota code.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner 2010-04-13 15:06:51 +10:00 committed by Alex Elder
parent 368e136174
commit e6a81f13aa
6 changed files with 30 additions and 88 deletions
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1
fs/xfs/linux-2.6/xfs_trace.h
View File

@ -667,7 +667,6 @@ DEFINE_DQUOT_EVENT(xfs_dqread_fail);
DEFINE_DQUOT_EVENT(xfs_dqlookup_found);
DEFINE_DQUOT_EVENT(xfs_dqlookup_want);
DEFINE_DQUOT_EVENT(xfs_dqlookup_freelist);
DEFINE_DQUOT_EVENT(xfs_dqlookup_move);
DEFINE_DQUOT_EVENT(xfs_dqlookup_done);
DEFINE_DQUOT_EVENT(xfs_dqget_hit);
DEFINE_DQUOT_EVENT(xfs_dqget_miss);

32
fs/xfs/quota/xfs_dquot.c
View File

@ -122,8 +122,7 @@ xfs_qm_dqinit(
dqp->q_nrefs = 0;
dqp->q_blkno = 0;
INIT_LIST_HEAD(&dqp->q_mplist);
dqp->HL_NEXT = NULL;
dqp->HL_PREVP = NULL;
INIT_LIST_HEAD(&dqp->q_hashlist);
dqp->q_bufoffset = 0;
dqp->q_fileoffset = 0;
dqp->q_transp = NULL;
@ -752,7 +751,6 @@ xfs_qm_dqlookup(
{
xfs_dquot_t *dqp;
uint flist_locked;
xfs_dquot_t *d;
ASSERT(mutex_is_locked(&qh->qh_lock));
@ -761,7 +759,7 @@ xfs_qm_dqlookup(
/*
* Traverse the hashchain looking for a match
*/
for (dqp = qh->qh_next; dqp != NULL; dqp = dqp->HL_NEXT) {
list_for_each_entry(dqp, &qh->qh_list, q_hashlist) {
/*
* We already have the hashlock. We don't need the
* dqlock to look at the id field of the dquot, since the
@ -828,21 +826,10 @@ xfs_qm_dqlookup(
* move the dquot to the front of the hashchain
*/
ASSERT(mutex_is_locked(&qh->qh_lock));
if (dqp->HL_PREVP != &qh->qh_next) {
trace_xfs_dqlookup_move(dqp);
if ((d = dqp->HL_NEXT))
d->HL_PREVP = dqp->HL_PREVP;
*(dqp->HL_PREVP) = d;
d = qh->qh_next;
d->HL_PREVP = &dqp->HL_NEXT;
dqp->HL_NEXT = d;
dqp->HL_PREVP = &qh->qh_next;
qh->qh_next = dqp;
}
list_move(&dqp->q_hashlist, &qh->qh_list);
trace_xfs_dqlookup_done(dqp);
*O_dqpp = dqp;
ASSERT(mutex_is_locked(&qh->qh_lock));
return (0);
return 0;
}
}
@ -1034,7 +1021,8 @@ xfs_qm_dqget(
*/
ASSERT(mutex_is_locked(&h->qh_lock));
dqp->q_hash = h;
XQM_HASHLIST_INSERT(h, dqp);
list_add(&dqp->q_hashlist, &h->qh_list);
h->qh_version++;
/*
* Attach this dquot to this filesystem's list of all dquots,
@ -1387,7 +1375,7 @@ int
xfs_qm_dqpurge(
xfs_dquot_t *dqp)
{
xfs_dqhash_t *thishash;
xfs_dqhash_t *qh = dqp->q_hash;
xfs_mount_t *mp = dqp->q_mount;
ASSERT(mutex_is_locked(&mp->m_quotainfo->qi_dqlist_lock));
@ -1453,8 +1441,8 @@ xfs_qm_dqpurge(
ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
!(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
thishash = dqp->q_hash;
XQM_HASHLIST_REMOVE(thishash, dqp);
list_del_init(&dqp->q_hashlist);
qh->qh_version++;
list_del_init(&dqp->q_mplist);
mp->m_quotainfo->qi_dqreclaims++;
mp->m_quotainfo->qi_dquots--;
@ -1470,7 +1458,7 @@ xfs_qm_dqpurge(
memset(&dqp->q_core, 0, sizeof(dqp->q_core));
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
mutex_unlock(&thishash->qh_lock);
mutex_unlock(&qh->qh_lock);
return (0);
}

9
fs/xfs/quota/xfs_dquot.h
View File

@ -33,17 +33,12 @@
* The hash chain headers (hash buckets)
*/
typedef struct xfs_dqhash {
struct xfs_dquot *qh_next;
struct list_head qh_list;
struct mutex qh_lock;
uint qh_version; /* ever increasing version */
uint qh_nelems; /* number of dquots on the list */
} xfs_dqhash_t;
typedef struct xfs_dqlink {
struct xfs_dquot *ql_next; /* forward link */
struct xfs_dquot **ql_prevp; /* pointer to prev ql_next */
} xfs_dqlink_t;
struct xfs_mount;
struct xfs_trans;
@ -57,7 +52,6 @@ struct xfs_trans;
typedef struct xfs_dqmarker {
struct xfs_dquot*dqm_flnext; /* link to freelist: must be first */
struct xfs_dquot*dqm_flprev;
xfs_dqlink_t dqm_hashlist; /* link to the hash chain */
uint dqm_flags; /* various flags (XFS_DQ_*) */
} xfs_dqmarker_t;
@ -67,6 +61,7 @@ typedef struct xfs_dqmarker {
typedef struct xfs_dquot {
xfs_dqmarker_t q_lists; /* list ptrs, q_flags (marker) */
struct list_head q_mplist; /* mount's list of dquots */
struct list_head q_hashlist; /* mount's list of dquots */
xfs_dqhash_t *q_hash; /* the hashchain header */
struct xfs_mount*q_mount; /* filesystem this relates to */
struct xfs_trans*q_transp; /* trans this belongs to currently */

9
fs/xfs/quota/xfs_qm.c
View File

@ -277,7 +277,7 @@ xfs_qm_rele_quotafs_ref(
if (dqp->dq_flags & XFS_DQ_INACTIVE) {
ASSERT(dqp->q_mount == NULL);
ASSERT(! XFS_DQ_IS_DIRTY(dqp));
ASSERT(dqp->HL_PREVP == NULL);
ASSERT(list_empty(&dqp->q_hashlist));
ASSERT(list_empty(&dqp->q_mplist));
XQM_FREELIST_REMOVE(dqp);
xfs_dqunlock(dqp);
@ -1176,7 +1176,7 @@ xfs_qm_list_init(
int n)
{
mutex_init(&list->qh_lock);
list->qh_next = NULL;
INIT_LIST_HEAD(&list->qh_list);
list->qh_version = 0;
list->qh_nelems = 0;
}
@ -1976,7 +1976,7 @@ startagain:
if (dqp->dq_flags & XFS_DQ_INACTIVE) {
ASSERT(mp == NULL);
ASSERT(! XFS_DQ_IS_DIRTY(dqp));
ASSERT(dqp->HL_PREVP == NULL);
ASSERT(list_empty(&dqp->q_hashlist));
ASSERT(list_empty(&dqp->q_mplist));
XQM_FREELIST_REMOVE(dqp);
xfs_dqunlock(dqp);
@ -2053,7 +2053,8 @@ startagain:
list_del_init(&dqp->q_mplist);
mp->m_quotainfo->qi_dquots--;
mp->m_quotainfo->qi_dqreclaims++;
XQM_HASHLIST_REMOVE(dqp->q_hash, dqp);
list_del_init(&dqp->q_hashlist);
dqp->q_hash->qh_version++;
XQM_FREELIST_REMOVE(dqp);
dqpout = dqp;
mutex_unlock(&mp->m_quotainfo->qi_dqlist_lock);

34
fs/xfs/quota/xfs_qm_syscalls.c
View File

@ -932,6 +932,7 @@ struct mutex qcheck_lock;
typedef struct dqtest {
xfs_dqmarker_t q_lists;
struct list_head q_hashlist;
xfs_dqhash_t *q_hash; /* the hashchain header */
xfs_mount_t *q_mount; /* filesystem this relates to */
xfs_dqid_t d_id; /* user id or group id */
@ -942,14 +943,9 @@ typedef struct dqtest {
STATIC void
xfs_qm_hashinsert(xfs_dqhash_t *h, xfs_dqtest_t *dqp)
{
xfs_dquot_t *d;
if (((d) = (h)->qh_next))
(d)->HL_PREVP = &((dqp)->HL_NEXT);
(dqp)->HL_NEXT = d;
(dqp)->HL_PREVP = &((h)->qh_next);
(h)->qh_next = (xfs_dquot_t *)dqp;
(h)->qh_version++;
(h)->qh_nelems++;
list_add(&dqp->q_hashlist, &h->qh_list);
h->qh_version++;
h->qh_nelems++;
}
STATIC void
xfs_qm_dqtest_print(
@ -1061,9 +1057,7 @@ xfs_qm_internalqcheck_dqget(
xfs_dqhash_t *h;
h = DQTEST_HASH(mp, id, type);
for (d = (xfs_dqtest_t *) h->qh_next; d != NULL;
d = (xfs_dqtest_t *) d->HL_NEXT) {
/* DQTEST_LIST_PRINT(h, HL_NEXT, "@@@@@ dqtestlist @@@@@"); */
list_for_each_entry(d, &h->qh_list, q_hashlist) {
if (d->d_id == id && mp == d->q_mount) {
*O_dq = d;
return (0);
@ -1074,6 +1068,7 @@ xfs_qm_internalqcheck_dqget(
d->d_id = id;
d->q_mount = mp;
d->q_hash = h;
INIT_LIST_HEAD(&d->q_hashlist);
xfs_qm_hashinsert(h, d);
*O_dq = d;
return (0);
@ -1180,8 +1175,6 @@ xfs_qm_internalqcheck(
xfs_ino_t lastino;
int done, count;
int i;
xfs_dqtest_t *d, *e;
xfs_dqhash_t *h1;
int error;
lastino = 0;
@ -1221,19 +1214,18 @@ xfs_qm_internalqcheck(
}
cmn_err(CE_DEBUG, "Checking results against system dquots");
for (i = 0; i < qmtest_hashmask; i++) {
h1 = &qmtest_udqtab[i];
for (d = (xfs_dqtest_t *) h1->qh_next; d != NULL; ) {
xfs_dqtest_t *d, *n;
xfs_dqhash_t *h;
h = &qmtest_udqtab[i];
list_for_each_entry_safe(d, n, &h->qh_list, q_hashlist) {
xfs_dqtest_cmp(d);
e = (xfs_dqtest_t *) d->HL_NEXT;
kmem_free(d);
d = e;
}
h1 = &qmtest_gdqtab[i];
for (d = (xfs_dqtest_t *) h1->qh_next; d != NULL; ) {
h = &qmtest_gdqtab[i];
list_for_each_entry_safe(d, n, &h->qh_list, q_hashlist) {
xfs_dqtest_cmp(d);
e = (xfs_dqtest_t *) d->HL_NEXT;
kmem_free(d);
d = e;
}
}

33
fs/xfs/quota/xfs_quota_priv.h
View File

@ -72,46 +72,13 @@
!dqp->q_core.d_rtbcount && \
!dqp->q_core.d_icount)
#define HL_PREVP dq_hashlist.ql_prevp
#define HL_NEXT dq_hashlist.ql_next
#define _LIST_REMOVE(h, dqp, PVP, NXT) \
{ \
xfs_dquot_t *d; \
if (((d) = (dqp)->NXT)) \
(d)->PVP = (dqp)->PVP; \
*((dqp)->PVP) = d; \
(dqp)->NXT = NULL; \
(dqp)->PVP = NULL; \
(h)->qh_version++; \
(h)->qh_nelems--; \
}
#define _LIST_INSERT(h, dqp, PVP, NXT) \
{ \
xfs_dquot_t *d; \
if (((d) = (h)->qh_next)) \
(d)->PVP = &((dqp)->NXT); \
(dqp)->NXT = d; \
(dqp)->PVP = &((h)->qh_next); \
(h)->qh_next = dqp; \
(h)->qh_version++; \
(h)->qh_nelems++; \
}
#define FOREACH_DQUOT_IN_FREELIST(dqp, qlist) \
for ((dqp) = (qlist)->qh_next; (dqp) != (xfs_dquot_t *)(qlist); \
(dqp) = (dqp)->dq_flnext)
#define XQM_HASHLIST_INSERT(h, dqp) \
_LIST_INSERT(h, dqp, HL_PREVP, HL_NEXT)
#define XQM_FREELIST_INSERT(h, dqp) \
xfs_qm_freelist_append(h, dqp)
#define XQM_HASHLIST_REMOVE(h, dqp) \
_LIST_REMOVE(h, dqp, HL_PREVP, HL_NEXT)
#define XQM_FREELIST_REMOVE(dqp) \
xfs_qm_freelist_unlink(dqp)