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xfs: remove the per-filesystem list of dquots

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Instead of keeping a separate per-filesystem list of dquots we can walk
the radix tree for the two places where we need to iterate all quota
structures.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Christoph Hellwig 2012-03-14 11:53:34 -05:00 committed by Ben Myers
parent 9f920f1164
commit b84a3a9675
5 changed files with 226 additions and 304 deletions
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95
fs/xfs/xfs_dquot.c
View file

@ -44,10 +44,9 @@
*
* ip->i_lock
* qi->qi_tree_lock
* qi->qi_dqlist_lock
* dquot->q_qlock (xfs_dqlock() and friends)
* dquot->q_flush (xfs_dqflock() and friends)
* qi->qi_lru_lock
* dquot->q_qlock (xfs_dqlock() and friends)
* dquot->q_flush (xfs_dqflock() and friends)
* qi->qi_lru_lock
*
* If two dquots need to be locked the order is user before group/project,
* otherwise by the lowest id first, see xfs_dqlock2.
@ -728,21 +727,13 @@ xfs_qm_dqget(
goto restart;
}
/*
* Attach this dquot to this filesystem's list of all dquots,
* kept inside the mount structure in m_quotainfo field
*/
mutex_lock(&qi->qi_dqlist_lock);
/*
* We return a locked dquot to the caller, with a reference taken
*/
xfs_dqlock(dqp);
dqp->q_nrefs = 1;
list_add(&dqp->q_mplist, &qi->qi_dqlist);
qi->qi_dquots++;
mutex_unlock(&qi->qi_dqlist_lock);
mutex_unlock(&qi->qi_tree_lock);
dqret:
@ -1017,86 +1008,6 @@ xfs_dqlock2(
}
}
/*
* Take a dquot out of the mount's dqlist as well as the hashlist. This is
* called via unmount as well as quotaoff, and the purge will always succeed.
*/
void
xfs_qm_dqpurge(
struct xfs_dquot *dqp)
{
struct xfs_mount *mp = dqp->q_mount;
struct xfs_quotainfo *qi = mp->m_quotainfo;
xfs_dqlock(dqp);
/*
* If we're turning off quotas, we have to make sure that, for
* example, we don't delete quota disk blocks while dquots are
* in the process of getting written to those disk blocks.
* This dquot might well be on AIL, and we can't leave it there
* if we're turning off quotas. Basically, we need this flush
* lock, and are willing to block on it.
*/
if (!xfs_dqflock_nowait(dqp)) {
/*
* Block on the flush lock after nudging dquot buffer,
* if it is incore.
*/
xfs_dqflock_pushbuf_wait(dqp);
}
/*
* If we are turning this type of quotas off, we don't care
* about the dirty metadata sitting in this dquot. OTOH, if
* we're unmounting, we do care, so we flush it and wait.
*/
if (XFS_DQ_IS_DIRTY(dqp)) {
int error;
/*
* We don't care about getting disk errors here. We need
* to purge this dquot anyway, so we go ahead regardless.
*/
error = xfs_qm_dqflush(dqp, SYNC_WAIT);
if (error)
xfs_warn(mp, "%s: dquot %p flush failed",
__func__, dqp);
xfs_dqflock(dqp);
}
ASSERT(atomic_read(&dqp->q_pincount) == 0);
ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
!(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
mutex_lock(&qi->qi_tree_lock);
radix_tree_delete(XFS_DQUOT_TREE(qi, dqp->q_core.d_flags),
be32_to_cpu(dqp->q_core.d_id));
mutex_unlock(&qi->qi_tree_lock);
mutex_lock(&qi->qi_dqlist_lock);
list_del_init(&dqp->q_mplist);
qi->qi_dqreclaims++;
qi->qi_dquots--;
mutex_unlock(&qi->qi_dqlist_lock);
/*
* We move dquots to the freelist as soon as their reference count
* hits zero, so it really should be on the freelist here.
*/
mutex_lock(&qi->qi_lru_lock);
ASSERT(!list_empty(&dqp->q_lru));
list_del_init(&dqp->q_lru);
qi->qi_lru_count--;
XFS_STATS_DEC(xs_qm_dquot_unused);
mutex_unlock(&qi->qi_lru_lock);
xfs_qm_dqdestroy(dqp);
}
/*
* Give the buffer a little push if it is incore and
* wait on the flush lock.

2
fs/xfs/xfs_dquot.h
View file

@ -38,7 +38,6 @@ struct xfs_trans;
typedef struct xfs_dquot {
uint dq_flags; /* various flags (XFS_DQ_*) */
struct list_head q_lru; /* global free list of dquots */
struct list_head q_mplist; /* mount's list of dquots */
struct xfs_mount*q_mount; /* filesystem this relates to */
struct xfs_trans*q_transp; /* trans this belongs to currently */
uint q_nrefs; /* # active refs from inodes */
@ -143,7 +142,6 @@ extern int xfs_qm_dqread(struct xfs_mount *, xfs_dqid_t, uint,
uint, struct xfs_dquot **);
extern void xfs_qm_dqdestroy(xfs_dquot_t *);
extern int xfs_qm_dqflush(xfs_dquot_t *, uint);
extern void xfs_qm_dqpurge(xfs_dquot_t *);
extern void xfs_qm_dqunpin_wait(xfs_dquot_t *);
extern void xfs_qm_adjust_dqtimers(xfs_mount_t *,
xfs_disk_dquot_t *);

415
fs/xfs/xfs_qm.c
View file

@ -168,6 +168,187 @@ xfs_qm_rele_quotafs_ref(
mutex_unlock(&xfs_Gqm_lock);
}
/*
* We use the batch lookup interface to iterate over the dquots as it
* currently is the only interface into the radix tree code that allows
* fuzzy lookups instead of exact matches. Holding the lock over multiple
* operations is fine as all callers are used either during mount/umount
* or quotaoff.
*/
#define XFS_DQ_LOOKUP_BATCH 32
STATIC int
xfs_qm_dquot_walk(
struct xfs_mount *mp,
int type,
int (*execute)(struct xfs_dquot *dqp))
{
struct xfs_quotainfo *qi = mp->m_quotainfo;
struct radix_tree_root *tree = XFS_DQUOT_TREE(qi, type);
uint32_t next_index;
int last_error = 0;
int skipped;
int nr_found;
restart:
skipped = 0;
next_index = 0;
nr_found = 0;
while (1) {
struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
int error = 0;
int i;
mutex_lock(&qi->qi_tree_lock);
nr_found = radix_tree_gang_lookup(tree, (void **)batch,
next_index, XFS_DQ_LOOKUP_BATCH);
if (!nr_found) {
mutex_unlock(&qi->qi_tree_lock);
break;
}
for (i = 0; i < nr_found; i++) {
struct xfs_dquot *dqp = batch[i];
next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
error = execute(batch[i]);
if (error == EAGAIN) {
skipped++;
continue;
}
if (error && last_error != EFSCORRUPTED)
last_error = error;
}
mutex_unlock(&qi->qi_tree_lock);
/* bail out if the filesystem is corrupted. */
if (last_error == EFSCORRUPTED) {
skipped = 0;
break;
}
}
if (skipped) {
delay(1);
goto restart;
}
return last_error;
}
/*
* Purge a dquot from all tracking data structures and free it.
*/
STATIC int
xfs_qm_dqpurge(
struct xfs_dquot *dqp)
{
struct xfs_mount *mp = dqp->q_mount;
struct xfs_quotainfo *qi = mp->m_quotainfo;
struct xfs_dquot *gdqp = NULL;
xfs_dqlock(dqp);
if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
xfs_dqunlock(dqp);
return EAGAIN;
}
/*
* If this quota has a group hint attached, prepare for releasing it
* now.
*/
gdqp = dqp->q_gdquot;
if (gdqp) {
xfs_dqlock(gdqp);
dqp->q_gdquot = NULL;
}
dqp->dq_flags |= XFS_DQ_FREEING;
/*
* If we're turning off quotas, we have to make sure that, for
* example, we don't delete quota disk blocks while dquots are
* in the process of getting written to those disk blocks.
* This dquot might well be on AIL, and we can't leave it there
* if we're turning off quotas. Basically, we need this flush
* lock, and are willing to block on it.
*/
if (!xfs_dqflock_nowait(dqp)) {
/*
* Block on the flush lock after nudging dquot buffer,
* if it is incore.
*/
xfs_dqflock_pushbuf_wait(dqp);
}
/*
* If we are turning this type of quotas off, we don't care
* about the dirty metadata sitting in this dquot. OTOH, if
* we're unmounting, we do care, so we flush it and wait.
*/
if (XFS_DQ_IS_DIRTY(dqp)) {
int error;
/*
* We don't care about getting disk errors here. We need
* to purge this dquot anyway, so we go ahead regardless.
*/
error = xfs_qm_dqflush(dqp, SYNC_WAIT);
if (error)
xfs_warn(mp, "%s: dquot %p flush failed",
__func__, dqp);
xfs_dqflock(dqp);
}
ASSERT(atomic_read(&dqp->q_pincount) == 0);
ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
!(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
radix_tree_delete(XFS_DQUOT_TREE(qi, dqp->q_core.d_flags),
be32_to_cpu(dqp->q_core.d_id));
qi->qi_dquots--;
/*
* We move dquots to the freelist as soon as their reference count
* hits zero, so it really should be on the freelist here.
*/
mutex_lock(&qi->qi_lru_lock);
ASSERT(!list_empty(&dqp->q_lru));
list_del_init(&dqp->q_lru);
qi->qi_lru_count--;
XFS_STATS_DEC(xs_qm_dquot_unused);
mutex_unlock(&qi->qi_lru_lock);
xfs_qm_dqdestroy(dqp);
if (gdqp)
xfs_qm_dqput(gdqp);
return 0;
}
/*
* Purge the dquot cache.
*/
void
xfs_qm_dqpurge_all(
struct xfs_mount *mp,
uint flags)
{
if (flags & XFS_QMOPT_UQUOTA)
xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge);
if (flags & XFS_QMOPT_GQUOTA)
xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge);
if (flags & XFS_QMOPT_PQUOTA)
xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge);
}
/*
* Just destroy the quotainfo structure.
*/
@ -306,175 +487,6 @@ xfs_qm_unmount_quotas(
}
}
/*
* Flush all dquots of the given file system to disk. The dquots are
* _not_ purged from memory here, just their data written to disk.
*/
STATIC int
xfs_qm_dqflush_all(
struct xfs_mount *mp)
{
struct xfs_quotainfo *q = mp->m_quotainfo;
int recl;
struct xfs_dquot *dqp;
int error;
if (!q)
return 0;
again:
mutex_lock(&q->qi_dqlist_lock);
list_for_each_entry(dqp, &q->qi_dqlist, q_mplist) {
xfs_dqlock(dqp);
if ((dqp->dq_flags & XFS_DQ_FREEING) ||
!XFS_DQ_IS_DIRTY(dqp)) {
xfs_dqunlock(dqp);
continue;
}
/* XXX a sentinel would be better */
recl = q->qi_dqreclaims;
if (!xfs_dqflock_nowait(dqp)) {
/*
* If we can't grab the flush lock then check
* to see if the dquot has been flushed delayed
* write. If so, grab its buffer and send it
* out immediately. We'll be able to acquire
* the flush lock when the I/O completes.
*/
xfs_dqflock_pushbuf_wait(dqp);
}
/*
* Let go of the mplist lock. We don't want to hold it
* across a disk write.
*/
mutex_unlock(&q->qi_dqlist_lock);
error = xfs_qm_dqflush(dqp, 0);
xfs_dqunlock(dqp);
if (error)
return error;
mutex_lock(&q->qi_dqlist_lock);
if (recl != q->qi_dqreclaims) {
mutex_unlock(&q->qi_dqlist_lock);
/* XXX restart limit */
goto again;
}
}
mutex_unlock(&q->qi_dqlist_lock);
/* return ! busy */
return 0;
}
/*
* Release the group dquot pointers the user dquots may be
* carrying around as a hint. mplist is locked on entry and exit.
*/
STATIC void
xfs_qm_detach_gdquots(
struct xfs_mount *mp)
{
struct xfs_quotainfo *q = mp->m_quotainfo;
struct xfs_dquot *dqp, *gdqp;
again:
ASSERT(mutex_is_locked(&q->qi_dqlist_lock));
list_for_each_entry(dqp, &q->qi_dqlist, q_mplist) {
xfs_dqlock(dqp);
if (dqp->dq_flags & XFS_DQ_FREEING) {
xfs_dqunlock(dqp);
mutex_unlock(&q->qi_dqlist_lock);
delay(1);
mutex_lock(&q->qi_dqlist_lock);
goto again;
}
gdqp = dqp->q_gdquot;
if (gdqp)
dqp->q_gdquot = NULL;
xfs_dqunlock(dqp);
if (gdqp)
xfs_qm_dqrele(gdqp);
}
}
/*
* Go through all the incore dquots of this file system and take them
* off the mplist and hashlist, if the dquot type matches the dqtype
* parameter. This is used when turning off quota accounting for
* users and/or groups, as well as when the filesystem is unmounting.
*/
STATIC int
xfs_qm_dqpurge_int(
struct xfs_mount *mp,
uint flags)
{
struct xfs_quotainfo *q = mp->m_quotainfo;
struct xfs_dquot *dqp, *n;
uint dqtype;
int nmisses = 0;
LIST_HEAD (dispose_list);
if (!q)
return 0;
dqtype = (flags & XFS_QMOPT_UQUOTA) ? XFS_DQ_USER : 0;
dqtype |= (flags & XFS_QMOPT_PQUOTA) ? XFS_DQ_PROJ : 0;
dqtype |= (flags & XFS_QMOPT_GQUOTA) ? XFS_DQ_GROUP : 0;
mutex_lock(&q->qi_dqlist_lock);
/*
* In the first pass through all incore dquots of this filesystem,
* we release the group dquot pointers the user dquots may be
* carrying around as a hint. We need to do this irrespective of
* what's being turned off.
*/
xfs_qm_detach_gdquots(mp);
/*
* Try to get rid of all of the unwanted dquots.
*/
list_for_each_entry_safe(dqp, n, &q->qi_dqlist, q_mplist) {
xfs_dqlock(dqp);
if ((dqp->dq_flags & dqtype) != 0 &&
!(dqp->dq_flags & XFS_DQ_FREEING)) {
if (dqp->q_nrefs == 0) {
dqp->dq_flags |= XFS_DQ_FREEING;
list_move_tail(&dqp->q_mplist, &dispose_list);
} else
nmisses++;
}
xfs_dqunlock(dqp);
}
mutex_unlock(&q->qi_dqlist_lock);
list_for_each_entry_safe(dqp, n, &dispose_list, q_mplist)
xfs_qm_dqpurge(dqp);
return nmisses;
}
int
xfs_qm_dqpurge_all(
xfs_mount_t *mp,
uint flags)
{
int ndquots;
/*
* Purge the dquot cache.
* None of the dquots should really be busy at this point.
*/
if (mp->m_quotainfo) {
while ((ndquots = xfs_qm_dqpurge_int(mp, flags))) {
delay(ndquots * 10);
}
}
return 0;
}
STATIC int
xfs_qm_dqattach_one(
xfs_inode_t *ip,
@ -749,15 +761,10 @@ xfs_qm_init_quotainfo(
INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
mutex_init(&qinf->qi_tree_lock);
INIT_LIST_HEAD(&qinf->qi_dqlist);
mutex_init(&qinf->qi_dqlist_lock);
INIT_LIST_HEAD(&qinf->qi_lru_list);
qinf->qi_lru_count = 0;
mutex_init(&qinf->qi_lru_lock);
qinf->qi_dqreclaims = 0;
/* mutex used to serialize quotaoffs */
mutex_init(&qinf->qi_quotaofflock);
@ -854,9 +861,6 @@ xfs_qm_destroy_quotainfo(
*/
xfs_qm_rele_quotafs_ref(mp);
ASSERT(list_empty(&qi->qi_dqlist));
mutex_destroy(&qi->qi_dqlist_lock);
if (qi->qi_uquotaip) {
IRELE(qi->qi_uquotaip);
qi->qi_uquotaip = NULL; /* paranoia */
@ -1307,6 +1311,28 @@ xfs_qm_dqusage_adjust(
return error;
}
STATIC int
xfs_qm_flush_one(
struct xfs_dquot *dqp)
{
int error = 0;
xfs_dqlock(dqp);
if (dqp->dq_flags & XFS_DQ_FREEING)
goto out_unlock;
if (!XFS_DQ_IS_DIRTY(dqp))
goto out_unlock;
if (!xfs_dqflock_nowait(dqp))
xfs_dqflock_pushbuf_wait(dqp);
error = xfs_qm_dqflush(dqp, 0);
out_unlock:
xfs_dqunlock(dqp);
return error;
}
/*
* Walk thru all the filesystem inodes and construct a consistent view
* of the disk quota world. If the quotacheck fails, disable quotas.
@ -1315,7 +1341,7 @@ int
xfs_qm_quotacheck(
xfs_mount_t *mp)
{
int done, count, error;
int done, count, error, error2;
xfs_ino_t lastino;
size_t structsz;
xfs_inode_t *uip, *gip;
@ -1329,12 +1355,6 @@ xfs_qm_quotacheck(
ASSERT(mp->m_quotainfo->qi_uquotaip || mp->m_quotainfo->qi_gquotaip);
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
/*
* There should be no cached dquots. The (simplistic) quotacheck
* algorithm doesn't like that.
*/
ASSERT(list_empty(&mp->m_quotainfo->qi_dqlist));
xfs_notice(mp, "Quotacheck needed: Please wait.");
/*
@ -1373,12 +1393,21 @@ xfs_qm_quotacheck(
} while (!done);
/*
* We've made all the changes that we need to make incore.
* Flush them down to disk buffers if everything was updated
* successfully.
* We've made all the changes that we need to make incore. Flush them
* down to disk buffers if everything was updated successfully.
*/
if (!error)
error = xfs_qm_dqflush_all(mp);
if (XFS_IS_UQUOTA_ON(mp))
error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one);
if (XFS_IS_GQUOTA_ON(mp)) {
error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one);
if (!error)
error = error2;
}
if (XFS_IS_PQUOTA_ON(mp)) {
error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one);
if (!error)
error = error2;
}
/*
* We can get this error if we couldn't do a dquot allocation inside
@ -1517,13 +1546,9 @@ xfs_qm_dqfree_one(
mutex_lock(&qi->qi_tree_lock);
radix_tree_delete(XFS_DQUOT_TREE(qi, dqp->q_core.d_flags),
be32_to_cpu(dqp->q_core.d_id));
mutex_unlock(&qi->qi_tree_lock);
mutex_lock(&qi->qi_dqlist_lock);
list_del_init(&dqp->q_mplist);
qi->qi_dquots--;
qi->qi_dqreclaims++;
mutex_unlock(&qi->qi_dqlist_lock);
mutex_unlock(&qi->qi_tree_lock);
xfs_qm_dqdestroy(dqp);
}
@ -1556,8 +1581,6 @@ xfs_qm_dqreclaim_one(
return;
}
ASSERT(!list_empty(&dqp->q_mplist));
/*
* Try to grab the flush lock. If this dquot is in the process of
* getting flushed to disk, we don't want to reclaim it.

6
fs/xfs/xfs_qm.h
View file

@ -63,11 +63,7 @@ typedef struct xfs_quotainfo {
struct list_head qi_lru_list;
struct mutex qi_lru_lock;
int qi_lru_count;
struct list_head qi_dqlist; /* all dquots in filesys */
struct mutex qi_dqlist_lock;
int qi_dquots;
int qi_dqreclaims; /* a change here indicates
a removal in the dqlist */
time_t qi_btimelimit; /* limit for blks timer */
time_t qi_itimelimit; /* limit for inodes timer */
time_t qi_rtbtimelimit;/* limit for rt blks timer */
@ -126,7 +122,7 @@ extern int xfs_qm_quotacheck(xfs_mount_t *);
extern int xfs_qm_write_sb_changes(xfs_mount_t *, __int64_t);
/* dquot stuff */
extern int xfs_qm_dqpurge_all(xfs_mount_t *, uint);
extern void xfs_qm_dqpurge_all(xfs_mount_t *, uint);
extern void xfs_qm_dqrele_all_inodes(xfs_mount_t *, uint);
/* quota ops */

12
fs/xfs/xfs_qm_syscalls.c
View file

@ -66,7 +66,6 @@ xfs_qm_scall_quotaoff(
int error;
uint inactivate_flags;
xfs_qoff_logitem_t *qoffstart;
int nculprits;
/*
* No file system can have quotas enabled on disk but not in core.
@ -172,18 +171,13 @@ xfs_qm_scall_quotaoff(
* This isn't protected by a particular lock directly, because we
* don't want to take a mrlock every time we depend on quotas being on.
*/
mp->m_qflags &= ~(flags);
mp->m_qflags &= ~flags;
/*
* Go through all the dquots of this file system and purge them,
* according to what was turned off. We may not be able to get rid
* of all dquots, because dquots can have temporary references that
* are not attached to inodes. eg. xfs_setattr, xfs_create.
* So, if we couldn't purge all the dquots from the filesystem,
* we can't get rid of the incore data structures.
* according to what was turned off.
*/
while ((nculprits = xfs_qm_dqpurge_all(mp, dqtype)))
delay(10 * nculprits);
xfs_qm_dqpurge_all(mp, dqtype);
/*
* Transactions that had started before ACTIVE state bit was cleared