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alistair23-linux
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xfs: sanitize qh_lock wrappers 

Get rid of various obsfucating wrappers for accessing the quota hash lock,
we only keep the accessors for accessing the mplist and freelist locks as
they encode a multi-level datastructure walk.  But make sure all of them
are defined in the same way as simple macros.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
hifive-unleashed-5.1
Christoph Hellwig 2009-02-09 08:47:22 +01:00 committed by Christoph Hellwig
parent 7201813bf5
commit c9a192dcf9
4 changed files with 36 additions and 80 deletions
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28
fs/xfs/quota/xfs_dquot.c
View File

@ -804,7 +804,7 @@ xfs_qm_dqlookup(
uint flist_locked;
xfs_dquot_t *d;
ASSERT(XFS_DQ_IS_HASH_LOCKED(qh));
ASSERT(mutex_is_locked(&qh->qh_lock));
flist_locked = B_FALSE;
@ -877,7 +877,7 @@ xfs_qm_dqlookup(
/*
* move the dquot to the front of the hashchain
*/
ASSERT(XFS_DQ_IS_HASH_LOCKED(qh));
ASSERT(mutex_is_locked(&qh->qh_lock));
if (dqp->HL_PREVP != &qh->qh_next) {
xfs_dqtrace_entry(dqp,
"DQLOOKUP: HASH MOVETOFRONT");
@ -892,13 +892,13 @@ xfs_qm_dqlookup(
}
xfs_dqtrace_entry(dqp, "LOOKUP END");
*O_dqpp = dqp;
ASSERT(XFS_DQ_IS_HASH_LOCKED(qh));
ASSERT(mutex_is_locked(&qh->qh_lock));
return (0);
}
}
*O_dqpp = NULL;
ASSERT(XFS_DQ_IS_HASH_LOCKED(qh));
ASSERT(mutex_is_locked(&qh->qh_lock));
return (1);
}
@ -956,7 +956,7 @@ xfs_qm_dqget(
ASSERT(ip->i_gdquot == NULL);
}
#endif
XFS_DQ_HASH_LOCK(h);
mutex_lock(&h->qh_lock);
/*
* Look in the cache (hashtable).
@ -971,7 +971,7 @@ xfs_qm_dqget(
*/
ASSERT(*O_dqpp);
ASSERT(XFS_DQ_IS_LOCKED(*O_dqpp));
XFS_DQ_HASH_UNLOCK(h);
mutex_unlock(&h->qh_lock);
xfs_dqtrace_entry(*O_dqpp, "DQGET DONE (FROM CACHE)");
return (0); /* success */
}
@ -991,7 +991,7 @@ xfs_qm_dqget(
* we don't keep the lock across a disk read
*/
version = h->qh_version;
XFS_DQ_HASH_UNLOCK(h);
mutex_unlock(&h->qh_lock);
/*
* Allocate the dquot on the kernel heap, and read the ondisk
@ -1056,7 +1056,7 @@ xfs_qm_dqget(
/*
* Hashlock comes after ilock in lock order
*/
XFS_DQ_HASH_LOCK(h);
mutex_lock(&h->qh_lock);
if (version != h->qh_version) {
xfs_dquot_t *tmpdqp;
/*
@ -1072,7 +1072,7 @@ xfs_qm_dqget(
* and start over.
*/
xfs_qm_dqput(tmpdqp);
XFS_DQ_HASH_UNLOCK(h);
mutex_unlock(&h->qh_lock);
xfs_qm_dqdestroy(dqp);
XQM_STATS_INC(xqmstats.xs_qm_dquot_dups);
goto again;
@ -1083,7 +1083,7 @@ xfs_qm_dqget(
* Put the dquot at the beginning of the hash-chain and mp's list
* LOCK ORDER: hashlock, freelistlock, mplistlock, udqlock, gdqlock ..
*/
ASSERT(XFS_DQ_IS_HASH_LOCKED(h));
ASSERT(mutex_is_locked(&h->qh_lock));
dqp->q_hash = h;
XQM_HASHLIST_INSERT(h, dqp);
@ -1102,7 +1102,7 @@ xfs_qm_dqget(
XQM_MPLIST_INSERT(&(XFS_QI_MPL_LIST(mp)), dqp);
xfs_qm_mplist_unlock(mp);
XFS_DQ_HASH_UNLOCK(h);
mutex_unlock(&h->qh_lock);
dqret:
ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
xfs_dqtrace_entry(dqp, "DQGET DONE");
@ -1440,7 +1440,7 @@ xfs_qm_dqpurge(
xfs_mount_t *mp = dqp->q_mount;
ASSERT(XFS_QM_IS_MPLIST_LOCKED(mp));
ASSERT(XFS_DQ_IS_HASH_LOCKED(dqp->q_hash));
ASSERT(mutex_is_locked(&dqp->q_hash->qh_lock));
xfs_dqlock(dqp);
/*
@ -1453,7 +1453,7 @@ xfs_qm_dqpurge(
*/
if (dqp->q_nrefs != 0) {
xfs_dqunlock(dqp);
XFS_DQ_HASH_UNLOCK(dqp->q_hash);
mutex_unlock(&dqp->q_hash->qh_lock);
return (1);
}
@ -1517,7 +1517,7 @@ xfs_qm_dqpurge(
memset(&dqp->q_core, 0, sizeof(dqp->q_core));
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
XFS_DQ_HASH_UNLOCK(thishash);
mutex_unlock(&thishash->qh_lock);
return (0);
}

49
fs/xfs/quota/xfs_qm.c
View File

@ -69,8 +69,6 @@ STATIC void xfs_qm_list_destroy(xfs_dqlist_t *);
STATIC void xfs_qm_freelist_init(xfs_frlist_t *);
STATIC void xfs_qm_freelist_destroy(xfs_frlist_t *);
STATIC int xfs_qm_mplist_nowait(xfs_mount_t *);
STATIC int xfs_qm_dqhashlock_nowait(xfs_dquot_t *);
STATIC int xfs_qm_init_quotainos(xfs_mount_t *);
STATIC int xfs_qm_init_quotainfo(xfs_mount_t *);
@ -576,10 +574,10 @@ xfs_qm_dqpurge_int(
continue;
}
if (! xfs_qm_dqhashlock_nowait(dqp)) {
if (!mutex_trylock(&dqp->q_hash->qh_lock)) {
nrecl = XFS_QI_MPLRECLAIMS(mp);
xfs_qm_mplist_unlock(mp);
XFS_DQ_HASH_LOCK(dqp->q_hash);
mutex_lock(&dqp->q_hash->qh_lock);
xfs_qm_mplist_lock(mp);
/*
@ -589,7 +587,7 @@ xfs_qm_dqpurge_int(
* this point, but somebody might be taking things off.
*/
if (nrecl != XFS_QI_MPLRECLAIMS(mp)) {
XFS_DQ_HASH_UNLOCK(dqp->q_hash);
mutex_unlock(&dqp->q_hash->qh_lock);
goto again;
}
}
@ -2027,7 +2025,7 @@ xfs_qm_shake_freelist(
* a dqlookup process that holds the hashlock that is
* waiting for the freelist lock.
*/
if (! xfs_qm_dqhashlock_nowait(dqp)) {
if (!mutex_trylock(&dqp->q_hash->qh_lock)) {
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
dqp = dqp->dq_flnext;
@ -2044,7 +2042,7 @@ xfs_qm_shake_freelist(
/* XXX put a sentinel so that we can come back here */
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
XFS_DQ_HASH_UNLOCK(hash);
mutex_unlock(&hash->qh_lock);
xfs_qm_freelist_unlock(xfs_Gqm);
if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
return nreclaimed;
@ -2061,7 +2059,7 @@ xfs_qm_shake_freelist(
XQM_HASHLIST_REMOVE(hash, dqp);
xfs_dqfunlock(dqp);
xfs_qm_mplist_unlock(dqp->q_mount);
XFS_DQ_HASH_UNLOCK(hash);
mutex_unlock(&hash->qh_lock);
off_freelist:
XQM_FREELIST_REMOVE(dqp);
@ -2203,7 +2201,7 @@ xfs_qm_dqreclaim_one(void)
continue;
}
if (! xfs_qm_dqhashlock_nowait(dqp))
if (!mutex_trylock(&dqp->q_hash->qh_lock))
goto mplistunlock;
ASSERT(dqp->q_nrefs == 0);
@ -2212,7 +2210,7 @@ xfs_qm_dqreclaim_one(void)
XQM_HASHLIST_REMOVE(dqp->q_hash, dqp);
XQM_FREELIST_REMOVE(dqp);
dqpout = dqp;
XFS_DQ_HASH_UNLOCK(dqp->q_hash);
mutex_unlock(&dqp->q_hash->qh_lock);
mplistunlock:
xfs_qm_mplist_unlock(dqp->q_mount);
xfs_dqfunlock(dqp);
@ -2715,34 +2713,3 @@ xfs_qm_freelist_append(xfs_frlist_t *ql, xfs_dquot_t *dq)
{
xfs_qm_freelist_insert((xfs_frlist_t *)ql->qh_prev, dq);
}
STATIC int
xfs_qm_dqhashlock_nowait(
xfs_dquot_t *dqp)
{
int locked;
locked = mutex_trylock(&((dqp)->q_hash->qh_lock));
return locked;
}
int
xfs_qm_freelist_lock_nowait(
xfs_qm_t *xqm)
{
int locked;
locked = mutex_trylock(&(xqm->qm_dqfreelist.qh_lock));
return locked;
}
STATIC int
xfs_qm_mplist_nowait(
xfs_mount_t *mp)
{
int locked;
ASSERT(mp->m_quotainfo);
locked = mutex_trylock(&(XFS_QI_MPLLOCK(mp)));
return locked;
}

1
fs/xfs/quota/xfs_qm.h
View File

@ -189,7 +189,6 @@ extern int xfs_qm_vop_chown_reserve(xfs_trans_t *, xfs_inode_t *,
/* list stuff */
extern void xfs_qm_freelist_append(xfs_frlist_t *, xfs_dquot_t *);
extern void xfs_qm_freelist_unlink(xfs_dquot_t *);
extern int xfs_qm_freelist_lock_nowait(xfs_qm_t *);
/* system call interface */
extern int xfs_qm_quotactl(struct xfs_mount *, int, int,

38
fs/xfs/quota/xfs_quota_priv.h
View File

@ -42,34 +42,24 @@
#define XFS_QI_QOFFLOCK(mp) ((mp)->m_quotainfo->qi_quotaofflock)
#define XFS_QI_MPL_LIST(mp) ((mp)->m_quotainfo->qi_dqlist)
#define XFS_QI_MPLLOCK(mp) ((mp)->m_quotainfo->qi_dqlist.qh_lock)
#define XFS_QI_MPLNEXT(mp) ((mp)->m_quotainfo->qi_dqlist.qh_next)
#define XFS_QI_MPLNDQUOTS(mp) ((mp)->m_quotainfo->qi_dqlist.qh_nelems)
#define XQMLCK(h) (mutex_lock(&((h)->qh_lock)))
#define XQMUNLCK(h) (mutex_unlock(&((h)->qh_lock)))
#ifdef DEBUG
struct xfs_dqhash;
static inline int XQMISLCKD(struct xfs_dqhash *h)
{
if (mutex_trylock(&h->qh_lock)) {
mutex_unlock(&h->qh_lock);
return 0;
}
return 1;
}
#endif
#define xfs_qm_mplist_lock(mp) \
mutex_lock(&(XFS_QI_MPL_LIST(mp).qh_lock))
#define xfs_qm_mplist_nowait(mp) \
mutex_trylock(&(XFS_QI_MPL_LIST(mp).qh_lock))
#define xfs_qm_mplist_unlock(mp) \
mutex_unlock(&(XFS_QI_MPL_LIST(mp).qh_lock))
#define XFS_QM_IS_MPLIST_LOCKED(mp) \
mutex_is_locked(&(XFS_QI_MPL_LIST(mp).qh_lock))
#define XFS_DQ_HASH_LOCK(h) XQMLCK(h)
#define XFS_DQ_HASH_UNLOCK(h) XQMUNLCK(h)
#define XFS_DQ_IS_HASH_LOCKED(h) XQMISLCKD(h)
#define xfs_qm_mplist_lock(mp) XQMLCK(&(XFS_QI_MPL_LIST(mp)))
#define xfs_qm_mplist_unlock(mp) XQMUNLCK(&(XFS_QI_MPL_LIST(mp)))
#define XFS_QM_IS_MPLIST_LOCKED(mp) XQMISLCKD(&(XFS_QI_MPL_LIST(mp)))
#define xfs_qm_freelist_lock(qm) XQMLCK(&((qm)->qm_dqfreelist))
#define xfs_qm_freelist_unlock(qm) XQMUNLCK(&((qm)->qm_dqfreelist))
#define xfs_qm_freelist_lock(qm) \
mutex_lock(&((qm)->qm_dqfreelist.qh_lock))
#define xfs_qm_freelist_lock_nowait(qm) \
mutex_trylock(&((qm)->qm_dqfreelist.qh_lock))
#define xfs_qm_freelist_unlock(qm) \
mutex_unlock(&((qm)->qm_dqfreelist.qh_lock))
/*
* Hash into a bucket in the dquot hash table, based on <mp, id>.