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xfs: remove support for disabling quota accounting on a mounted file system

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Disabling quota accounting is hairy, racy code with all kinds of pitfalls.
And it has a very strange mind set, as quota accounting (unlike
enforcement) really is a propery of the on-disk format.  There is no good
use case for supporting this.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Christoph Hellwig 2021-08-06 11:05:36 -07:00 committed by Darrick J. Wong
parent c500bee1c5
commit 40b52225e5
8 changed files with 13 additions and 454 deletions
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30
fs/xfs/libxfs/xfs_trans_resv.c
View File

@ -798,29 +798,6 @@ xfs_calc_qm_dqalloc_reservation(
XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) - 1);
}
/*
* Turning off quotas.
* the quota off logitems: sizeof(struct xfs_qoff_logitem) * 2
* the superblock for the quota flags: sector size
*/
STATIC uint
xfs_calc_qm_quotaoff_reservation(
struct xfs_mount *mp)
{
return sizeof(struct xfs_qoff_logitem) * 2 +
xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
}
/*
* End of turning off quotas.
* the quota off logitems: sizeof(struct xfs_qoff_logitem) * 2
*/
STATIC uint
xfs_calc_qm_quotaoff_end_reservation(void)
{
return sizeof(struct xfs_qoff_logitem) * 2;
}
/*
* Syncing the incore super block changes to disk.
* the super block to reflect the changes: sector size
@ -923,13 +900,6 @@ xfs_trans_resv_calc(
resp->tr_qm_setqlim.tr_logres = xfs_calc_qm_setqlim_reservation();
resp->tr_qm_setqlim.tr_logcount = XFS_DEFAULT_LOG_COUNT;
resp->tr_qm_quotaoff.tr_logres = xfs_calc_qm_quotaoff_reservation(mp);
resp->tr_qm_quotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT;
resp->tr_qm_equotaoff.tr_logres =
xfs_calc_qm_quotaoff_end_reservation();
resp->tr_qm_equotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT;
resp->tr_sb.tr_logres = xfs_calc_sb_reservation(mp);
resp->tr_sb.tr_logcount = XFS_DEFAULT_LOG_COUNT;

2
fs/xfs/libxfs/xfs_trans_resv.h
View File

@ -46,8 +46,6 @@ struct xfs_trans_resv {
struct xfs_trans_res tr_growrtfree; /* grow realtime freeing */
struct xfs_trans_res tr_qm_setqlim; /* adjust quota limits */
struct xfs_trans_res tr_qm_dqalloc; /* allocate quota on disk */
struct xfs_trans_res tr_qm_quotaoff; /* turn quota off */
struct xfs_trans_res tr_qm_equotaoff;/* end of turn quota off */
struct xfs_trans_res tr_sb; /* modify superblock */
struct xfs_trans_res tr_fsyncts; /* update timestamps on fsync */
};

134
fs/xfs/xfs_dquot_item.c
View File

@ -218,137 +218,3 @@ xfs_qm_dquot_logitem_init(
&xfs_dquot_item_ops);
lp->qli_dquot = dqp;
}
/*------------------ QUOTAOFF LOG ITEMS -------------------*/
static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
{
return container_of(lip, struct xfs_qoff_logitem, qql_item);
}
/*
* This returns the number of iovecs needed to log the given quotaoff item.
* We only need 1 iovec for an quotaoff item. It just logs the
* quotaoff_log_format structure.
*/
STATIC void
xfs_qm_qoff_logitem_size(
struct xfs_log_item *lip,
int *nvecs,
int *nbytes)
{
*nvecs += 1;
*nbytes += sizeof(struct xfs_qoff_logitem);
}
STATIC void
xfs_qm_qoff_logitem_format(
struct xfs_log_item *lip,
struct xfs_log_vec *lv)
{
struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
struct xfs_log_iovec *vecp = NULL;
struct xfs_qoff_logformat *qlf;
qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QUOTAOFF);
qlf->qf_type = XFS_LI_QUOTAOFF;
qlf->qf_size = 1;
qlf->qf_flags = qflip->qql_flags;
xlog_finish_iovec(lv, vecp, sizeof(struct xfs_qoff_logitem));
}
/*
* There isn't much you can do to push a quotaoff item. It is simply
* stuck waiting for the log to be flushed to disk.
*/
STATIC uint
xfs_qm_qoff_logitem_push(
struct xfs_log_item *lip,
struct list_head *buffer_list)
{
return XFS_ITEM_LOCKED;
}
STATIC xfs_lsn_t
xfs_qm_qoffend_logitem_committed(
struct xfs_log_item *lip,
xfs_lsn_t lsn)
{
struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip);
struct xfs_qoff_logitem *qfs = qfe->qql_start_lip;
xfs_qm_qoff_logitem_relse(qfs);
kmem_free(lip->li_lv_shadow);
kmem_free(qfe);
return (xfs_lsn_t)-1;
}
STATIC void
xfs_qm_qoff_logitem_release(
struct xfs_log_item *lip)
{
struct xfs_qoff_logitem *qoff = QOFF_ITEM(lip);
if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) {
if (qoff->qql_start_lip)
xfs_qm_qoff_logitem_relse(qoff->qql_start_lip);
xfs_qm_qoff_logitem_relse(qoff);
}
}
static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
.iop_size = xfs_qm_qoff_logitem_size,
.iop_format = xfs_qm_qoff_logitem_format,
.iop_committed = xfs_qm_qoffend_logitem_committed,
.iop_push = xfs_qm_qoff_logitem_push,
.iop_release = xfs_qm_qoff_logitem_release,
};
static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
.iop_size = xfs_qm_qoff_logitem_size,
.iop_format = xfs_qm_qoff_logitem_format,
.iop_push = xfs_qm_qoff_logitem_push,
.iop_release = xfs_qm_qoff_logitem_release,
};
/*
* Delete the quotaoff intent from the AIL and free it. On success,
* this should only be called for the start item. It can be used for
* either on shutdown or abort.
*/
void
xfs_qm_qoff_logitem_relse(
struct xfs_qoff_logitem *qoff)
{
struct xfs_log_item *lip = &qoff->qql_item;
ASSERT(test_bit(XFS_LI_IN_AIL, &lip->li_flags) ||
test_bit(XFS_LI_ABORTED, &lip->li_flags) ||
XFS_FORCED_SHUTDOWN(lip->li_mountp));
xfs_trans_ail_delete(lip, 0);
kmem_free(lip->li_lv_shadow);
kmem_free(qoff);
}
/*
* Allocate and initialize an quotaoff item of the correct quota type(s).
*/
struct xfs_qoff_logitem *
xfs_qm_qoff_logitem_init(
struct xfs_mount *mp,
struct xfs_qoff_logitem *start,
uint flags)
{
struct xfs_qoff_logitem *qf;
qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), 0);
xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
&xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
qf->qql_item.li_mountp = mp;
qf->qql_start_lip = start;
qf->qql_flags = flags;
return qf;
}

17
fs/xfs/xfs_dquot_item.h
View File

@ -9,7 +9,6 @@
struct xfs_dquot;
struct xfs_trans;
struct xfs_mount;
struct xfs_qoff_logitem;
struct xfs_dq_logitem {
struct xfs_log_item qli_item; /* common portion */
@ -17,22 +16,6 @@ struct xfs_dq_logitem {
xfs_lsn_t qli_flush_lsn; /* lsn at last flush */
};
struct xfs_qoff_logitem {
struct xfs_log_item qql_item; /* common portion */
struct xfs_qoff_logitem *qql_start_lip; /* qoff-start logitem, if any */
unsigned int qql_flags;
};
void xfs_qm_dquot_logitem_init(struct xfs_dquot *dqp);
struct xfs_qoff_logitem *xfs_qm_qoff_logitem_init(struct xfs_mount *mp,
struct xfs_qoff_logitem *start,
uint flags);
void xfs_qm_qoff_logitem_relse(struct xfs_qoff_logitem *);
struct xfs_qoff_logitem *xfs_trans_get_qoff_item(struct xfs_trans *tp,
struct xfs_qoff_logitem *startqoff,
uint flags);
void xfs_trans_log_quotaoff_item(struct xfs_trans *tp,
struct xfs_qoff_logitem *qlp);
#endif /* __XFS_DQUOT_ITEM_H__ */

2
fs/xfs/xfs_qm.c
View File

@ -185,7 +185,7 @@ out_unlock:
/*
* Purge the dquot cache.
*/
void
static void
xfs_qm_dqpurge_all(
struct xfs_mount *mp,
uint flags)

3
fs/xfs/xfs_qm.h
View File

@ -140,9 +140,6 @@ struct xfs_dquot_acct {
extern void xfs_qm_destroy_quotainfo(struct xfs_mount *);
/* dquot stuff */
extern void xfs_qm_dqpurge_all(struct xfs_mount *, uint);
/* quota ops */
extern int xfs_qm_scall_trunc_qfiles(struct xfs_mount *, uint);
extern int xfs_qm_scall_getquota(struct xfs_mount *mp,

231
fs/xfs/xfs_qm_syscalls.c
View File

@ -19,91 +19,11 @@
#include "xfs_qm.h"
#include "xfs_icache.h"
STATIC int
xfs_qm_log_quotaoff(
struct xfs_mount *mp,
struct xfs_qoff_logitem **qoffstartp,
uint flags)
{
struct xfs_trans *tp;
int error;
struct xfs_qoff_logitem *qoffi;
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_quotaoff, 0, 0, 0, &tp);
if (error)
goto out;
qoffi = xfs_trans_get_qoff_item(tp, NULL, flags & XFS_ALL_QUOTA_ACCT);
xfs_trans_log_quotaoff_item(tp, qoffi);
spin_lock(&mp->m_sb_lock);
mp->m_sb.sb_qflags = (mp->m_qflags & ~(flags)) & XFS_MOUNT_QUOTA_ALL;
spin_unlock(&mp->m_sb_lock);
xfs_log_sb(tp);
/*
* We have to make sure that the transaction is secure on disk before we
* return and actually stop quota accounting. So, make it synchronous.
* We don't care about quotoff's performance.
*/
xfs_trans_set_sync(tp);
error = xfs_trans_commit(tp);
if (error)
goto out;
*qoffstartp = qoffi;
out:
return error;
}
STATIC int
xfs_qm_log_quotaoff_end(
struct xfs_mount *mp,
struct xfs_qoff_logitem **startqoff,
uint flags)
{
struct xfs_trans *tp;
int error;
struct xfs_qoff_logitem *qoffi;
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_equotaoff, 0, 0, 0, &tp);
if (error)
return error;
qoffi = xfs_trans_get_qoff_item(tp, *startqoff,
flags & XFS_ALL_QUOTA_ACCT);
xfs_trans_log_quotaoff_item(tp, qoffi);
*startqoff = NULL;
/*
* We have to make sure that the transaction is secure on disk before we
* return and actually stop quota accounting. So, make it synchronous.
* We don't care about quotoff's performance.
*/
xfs_trans_set_sync(tp);
return xfs_trans_commit(tp);
}
/*
* Turn off quota accounting and/or enforcement for all udquots and/or
* gdquots. Called only at unmount time.
*
* This assumes that there are no dquots of this file system cached
* incore, and modifies the ondisk dquot directly. Therefore, for example,
* it is an error to call this twice, without purging the cache.
*/
int
xfs_qm_scall_quotaoff(
xfs_mount_t *mp,
uint flags)
{
struct xfs_quotainfo *q = mp->m_quotainfo;
uint dqtype;
int error;
uint inactivate_flags;
struct xfs_qoff_logitem *qoffstart = NULL;
/*
* No file system can have quotas enabled on disk but not in core.
* Note that quota utilities (like quotaoff) _expect_
@ -111,162 +31,25 @@ xfs_qm_scall_quotaoff(
*/
if ((mp->m_qflags & flags) == 0)
return -EEXIST;
error = 0;
flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
/*
* We don't want to deal with two quotaoffs messing up each other,
* so we're going to serialize it. quotaoff isn't exactly a performance
* critical thing.
* If quotaoff, then we must be dealing with the root filesystem.
* We do not support actually turning off quota accounting any more.
* Just log a warning and ignore the accounting related flags.
*/
ASSERT(q);
mutex_lock(&q->qi_quotaofflock);
/*
* If we're just turning off quota enforcement, change mp and go.
*/
if ((flags & XFS_ALL_QUOTA_ACCT) == 0) {
mp->m_qflags &= ~(flags);
if (flags & XFS_ALL_QUOTA_ACCT)
xfs_info(mp, "disabling of quota accounting not supported.");
mutex_lock(&mp->m_quotainfo->qi_quotaofflock);
mp->m_qflags &= ~(flags & XFS_ALL_QUOTA_ENFD);
spin_lock(&mp->m_sb_lock);
mp->m_sb.sb_qflags = mp->m_qflags;
spin_unlock(&mp->m_sb_lock);
mutex_unlock(&q->qi_quotaofflock);
mutex_unlock(&mp->m_quotainfo->qi_quotaofflock);
/* XXX what to do if error ? Revert back to old vals incore ? */
return xfs_sync_sb(mp, false);
}
dqtype = 0;
inactivate_flags = 0;
/*
* If accounting is off, we must turn enforcement off, clear the
* quota 'CHKD' certificate to make it known that we have to
* do a quotacheck the next time this quota is turned on.
*/
if (flags & XFS_UQUOTA_ACCT) {
dqtype |= XFS_QMOPT_UQUOTA;
flags |= (XFS_UQUOTA_CHKD | XFS_UQUOTA_ENFD);
inactivate_flags |= XFS_UQUOTA_ACTIVE;
}
if (flags & XFS_GQUOTA_ACCT) {
dqtype |= XFS_QMOPT_GQUOTA;
flags |= (XFS_GQUOTA_CHKD | XFS_GQUOTA_ENFD);
inactivate_flags |= XFS_GQUOTA_ACTIVE;
}
if (flags & XFS_PQUOTA_ACCT) {
dqtype |= XFS_QMOPT_PQUOTA;
flags |= (XFS_PQUOTA_CHKD | XFS_PQUOTA_ENFD);
inactivate_flags |= XFS_PQUOTA_ACTIVE;
}
/*
* Nothing to do? Don't complain. This happens when we're just
* turning off quota enforcement.
*/
if ((mp->m_qflags & flags) == 0)
goto out_unlock;
/*
* Write the LI_QUOTAOFF log record, and do SB changes atomically,
* and synchronously. If we fail to write, we should abort the
* operation as it cannot be recovered safely if we crash.
*/
error = xfs_qm_log_quotaoff(mp, &qoffstart, flags);
if (error)
goto out_unlock;
/*
* Next we clear the XFS_MOUNT_*DQ_ACTIVE bit(s) in the mount struct
* to take care of the race between dqget and quotaoff. We don't take
* any special locks to reset these bits. All processes need to check
* these bits *after* taking inode lock(s) to see if the particular
* quota type is in the process of being turned off. If *ACTIVE, it is
* guaranteed that all dquot structures and all quotainode ptrs will all
* stay valid as long as that inode is kept locked.
*
* There is no turning back after this.
*/
mp->m_qflags &= ~inactivate_flags;
/*
* Give back all the dquot reference(s) held by inodes.
* Here we go thru every single incore inode in this file system, and
* do a dqrele on the i_udquot/i_gdquot that it may have.
* Essentially, as long as somebody has an inode locked, this guarantees
* that quotas will not be turned off. This is handy because in a
* transaction once we lock the inode(s) and check for quotaon, we can
* depend on the quota inodes (and other things) being valid as long as
* we keep the lock(s).
*/
error = xfs_dqrele_all_inodes(mp, flags);
ASSERT(!error);
/*
* Next we make the changes in the quota flag in the mount struct.
* 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;
/*
* Go through all the dquots of this file system and purge them,
* according to what was turned off.
*/
xfs_qm_dqpurge_all(mp, dqtype);
/*
* Transactions that had started before ACTIVE state bit was cleared
* could have logged many dquots, so they'd have higher LSNs than
* the first QUOTAOFF log record does. If we happen to crash when
* the tail of the log has gone past the QUOTAOFF record, but
* before the last dquot modification, those dquots __will__
* recover, and that's not good.
*
* So, we have QUOTAOFF start and end logitems; the start
* logitem won't get overwritten until the end logitem appears...
*/
error = xfs_qm_log_quotaoff_end(mp, &qoffstart, flags);
if (error) {
/* We're screwed now. Shutdown is the only option. */
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
goto out_unlock;
}
/*
* If all quotas are completely turned off, close shop.
*/
if (mp->m_qflags == 0) {
mutex_unlock(&q->qi_quotaofflock);
xfs_qm_destroy_quotainfo(mp);
return 0;
}
/*
* Release our quotainode references if we don't need them anymore.
*/
if ((dqtype & XFS_QMOPT_UQUOTA) && q->qi_uquotaip) {
xfs_irele(q->qi_uquotaip);
q->qi_uquotaip = NULL;
}
if ((dqtype & XFS_QMOPT_GQUOTA) && q->qi_gquotaip) {
xfs_irele(q->qi_gquotaip);
q->qi_gquotaip = NULL;
}
if ((dqtype & XFS_QMOPT_PQUOTA) && q->qi_pquotaip) {
xfs_irele(q->qi_pquotaip);
q->qi_pquotaip = NULL;
}
out_unlock:
if (error && qoffstart)
xfs_qm_qoff_logitem_relse(qoffstart);
mutex_unlock(&q->qi_quotaofflock);
return error;
}
STATIC int
xfs_qm_scall_trunc_qfile(
struct xfs_mount *mp,

38
fs/xfs/xfs_trans_dquot.c
View File

@ -843,44 +843,6 @@ xfs_trans_reserve_quota_icreate(
dblocks, 1, XFS_QMOPT_RES_REGBLKS);
}
/*
* This routine is called to allocate a quotaoff log item.
*/
struct xfs_qoff_logitem *
xfs_trans_get_qoff_item(
struct xfs_trans *tp,
struct xfs_qoff_logitem *startqoff,
uint flags)
{
struct xfs_qoff_logitem *q;
ASSERT(tp != NULL);
q = xfs_qm_qoff_logitem_init(tp->t_mountp, startqoff, flags);
ASSERT(q != NULL);
/*
* Get a log_item_desc to point at the new item.
*/
xfs_trans_add_item(tp, &q->qql_item);
return q;
}
/*
* This is called to mark the quotaoff logitem as needing
* to be logged when the transaction is committed. The logitem must
* already be associated with the given transaction.
*/
void
xfs_trans_log_quotaoff_item(
struct xfs_trans *tp,
struct xfs_qoff_logitem *qlp)
{
tp->t_flags |= XFS_TRANS_DIRTY;
set_bit(XFS_LI_DIRTY, &qlp->qql_item.li_flags);
}
STATIC void
xfs_trans_alloc_dqinfo(
xfs_trans_t *tp)