// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2002 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_quota.h"
#include "xfs_qm.h"
#include "xfs_trace.h"
#include "xfs_error.h"
#include "xfs_health.h"
STATIC void xfs_trans_alloc_dqinfo(xfs_trans_t *);
/*
* Add the locked dquot to the transaction.
* The dquot must be locked, and it cannot be associated with any
* transaction.
*/
void
xfs_trans_dqjoin(
struct xfs_trans *tp,
struct xfs_dquot *dqp)
{
ASSERT(XFS_DQ_IS_LOCKED(dqp));
ASSERT(dqp->q_logitem.qli_dquot == dqp);
/*
* Get a log_item_desc to point at the new item.
*/
xfs_trans_add_item(tp, &dqp->q_logitem.qli_item);
}
/*
* This is called to mark the dquot as needing
* to be logged when the transaction is committed. The dquot must
* already be associated with the given transaction.
* Note that it marks the entire transaction as dirty. In the ordinary
* case, this gets called via xfs_trans_commit, after the transaction
* is already dirty. However, there's nothing stop this from getting
* called directly, as done by xfs_qm_scall_setqlim. Hence, the TRANS_DIRTY
* flag.
*/
void
xfs_trans_log_dquot(
struct xfs_trans *tp,
struct xfs_dquot *dqp)
{
ASSERT(XFS_DQ_IS_LOCKED(dqp));
/* Upgrade the dquot to bigtime format if possible. */
if (dqp->q_id != 0 &&
xfs_has_bigtime(tp->t_mountp) &&
!(dqp->q_type & XFS_DQTYPE_BIGTIME))
dqp->q_type |= XFS_DQTYPE_BIGTIME;
tp->t_flags |= XFS_TRANS_DIRTY;
set_bit(XFS_LI_DIRTY, &dqp->q_logitem.qli_item.li_flags);
}
/*
* Carry forward whatever is left of the quota blk reservation to
* the spanky new transaction
*/
void
xfs_trans_dup_dqinfo(
struct xfs_trans *otp,
struct xfs_trans *ntp)
{
struct xfs_dqtrx *oq, *nq;
int i, j;
struct xfs_dqtrx *oqa, *nqa;
uint64_t blk_res_used;
if (!otp->t_dqinfo)
return;
xfs_trans_alloc_dqinfo(ntp);
for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
oqa = otp->t_dqinfo->dqs[j];
nqa = ntp->t_dqinfo->dqs[j];
for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
blk_res_used = 0;
if (oqa[i].qt_dquot == NULL)
break;
oq = &oqa[i];
nq = &nqa[i];
if (oq->qt_blk_res && oq->qt_bcount_delta > 0)
blk_res_used = oq->qt_bcount_delta;
nq->qt_dquot = oq->qt_dquot;
nq->qt_bcount_delta = nq->qt_icount_delta = 0;
nq->qt_rtbcount_delta = 0;
/*
* Transfer whatever is left of the reservations.
*/
nq->qt_blk_res = oq->qt_blk_res - blk_res_used;
oq->qt_blk_res = blk_res_used;
nq->qt_rtblk_res = oq->qt_rtblk_res -
oq->qt_rtblk_res_used;
oq->qt_rtblk_res = oq->qt_rtblk_res_used;
nq->qt_ino_res = oq->qt_ino_res - oq->qt_ino_res_used;
oq->qt_ino_res = oq->qt_ino_res_used;
}
}
}
#ifdef CONFIG_XFS_LIVE_HOOKS
/*
* Use a static key here to reduce the overhead of quota live updates. If the
* compiler supports jump labels, the static branch will be replaced by a nop
* sled when there are no hook users. Online fsck is currently the only
* caller, so this is a reasonable tradeoff.
*
* Note: Patching the kernel code requires taking the cpu hotplug lock. Other
* parts of the kernel allocate memory with that lock held, which means that
* XFS callers cannot hold any locks that might be used by memory reclaim or
* writeback when calling the static_branch_{inc,dec} functions.
*/
DEFINE_STATIC_XFS_HOOK_SWITCH(xfs_dqtrx_hooks_switch);
void
xfs_dqtrx_hook_disable(void)
{
xfs_hooks_switch_off(&xfs_dqtrx_hooks_switch);
}
void
xfs_dqtrx_hook_enable(void)
{
xfs_hooks_switch_on(&xfs_dqtrx_hooks_switch);
}
/* Schedule a transactional dquot update on behalf of an inode. */
void
xfs_trans_mod_ino_dquot(
struct xfs_trans *tp,
struct xfs_inode *ip,
struct xfs_dquot *dqp,
unsigned int field,
int64_t delta)
{
xfs_trans_mod_dquot(tp, dqp, field, delta);
if (xfs_hooks_switched_on(&xfs_dqtrx_hooks_switch)) {
struct xfs_mod_ino_dqtrx_params p = {
.tx_id = (uintptr_t)tp,
.ino = ip->i_ino,
.q_type = xfs_dquot_type(dqp),
.q_id = dqp->q_id,
.delta = delta
};
struct xfs_quotainfo *qi = tp->t_mountp->m_quotainfo;
xfs_hooks_call(&qi->qi_mod_ino_dqtrx_hooks, field, &p);
}
}
/* Call the specified functions during a dquot counter update. */
int
xfs_dqtrx_hook_add(
struct xfs_quotainfo *qi,
struct xfs_dqtrx_hook *hook)
{
int error;
/*
* Transactional dquot updates first call the mod hook when changes
* are attached to the transaction and then call the apply hook when
* those changes are committed (or canceled).
*
* The apply hook must be installed before the mod hook so that we
* never fail to catch the end of a quota update sequence.
*/
error = xfs_hooks_add(&qi->qi_apply_dqtrx_hooks, &hook->apply_hook);
if (error)
goto out;
error = xfs_hooks_add(&qi->qi_mod_ino_dqtrx_hooks, &hook->mod_hook);
if (error)
goto out_apply;
return 0;
out_apply:
xfs_hooks_del(&qi->qi_apply_dqtrx_hooks, &hook->apply_hook);
out:
return error;
}
/* Stop calling the specified function during a dquot counter update. */
void
xfs_dqtrx_hook_del(
struct xfs_quotainfo *qi,
struct xfs_dqtrx_hook *hook)
{
/*
* The mod hook must be removed before apply hook to avoid giving the
* hook consumer with an incomplete update. No hooks should be running
* after these functions return.
*/
xfs_hooks_del(&qi->qi_mod_ino_dqtrx_hooks, &hook->mod_hook);
xfs_hooks_del(&qi->qi_apply_dqtrx_hooks, &hook->apply_hook);
}
/* Configure dquot update hook functions. */
void
xfs_dqtrx_hook_setup(
struct xfs_dqtrx_hook *hook,
notifier_fn_t mod_fn,
notifier_fn_t apply_fn)
{
xfs_hook_setup(&hook->mod_hook, mod_fn);
xfs_hook_setup(&hook->apply_hook, apply_fn);
}
#endif /* CONFIG_XFS_LIVE_HOOKS */
/*
* Wrap around mod_dquot to account for both user and group quotas.
*/
void
xfs_trans_mod_dquot_byino(
xfs_trans_t *tp,
xfs_inode_t *ip,
uint field,
int64_t delta)
{
xfs_mount_t *mp = tp->t_mountp;
if (!XFS_IS_QUOTA_ON(mp) ||
xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
return;
if (XFS_IS_UQUOTA_ON(mp) && ip->i_udquot)
xfs_trans_mod_ino_dquot(tp, ip, ip->i_udquot, field, delta);
if (XFS_IS_GQUOTA_ON(mp) && ip->i_gdquot)
xfs_trans_mod_ino_dquot(tp, ip, ip->i_gdquot, field, delta);
if (XFS_IS_PQUOTA_ON(mp) && ip->i_pdquot)
xfs_trans_mod_ino_dquot(tp, ip, ip->i_pdquot, field, delta);
}
STATIC struct xfs_dqtrx *
xfs_trans_get_dqtrx(
struct xfs_trans *tp,
struct xfs_dquot *dqp)
{
int i;
struct xfs_dqtrx *qa;
switch (xfs_dquot_type(dqp)) {
case XFS_DQTYPE_USER:
qa = tp->t_dqinfo->dqs[XFS_QM_TRANS_USR];
break;
case XFS_DQTYPE_GROUP:
qa = tp->t_dqinfo->dqs[XFS_QM_TRANS_GRP];
break;
case XFS_DQTYPE_PROJ:
qa = tp->t_dqinfo->dqs[XFS_QM_TRANS_PRJ];
break;
default:
return NULL;
}
for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
if (qa[i].qt_dquot == NULL ||
qa[i].qt_dquot == dqp)
return &qa[i];
}
return NULL;
}
/*
* Make the changes in the transaction structure.
* The moral equivalent to xfs_trans_mod_sb().
* We don't touch any fields in the dquot, so we don't care
* if it's locked or not (most of the time it won't be).
*/
void
xfs_trans_mod_dquot(
struct xfs_trans *tp,
struct xfs_dquot *dqp,
uint field,
int64_t delta)
{
struct xfs_dqtrx *qtrx;
ASSERT(tp);
ASSERT(XFS_IS_QUOTA_ON(tp->t_mountp));
qtrx = NULL;
if (!delta)
return;
if (tp->t_dqinfo == NULL)
xfs_trans_alloc_dqinfo(tp);
/*
* Find either the first free slot or the slot that belongs
* to this dquot.
*/
qtrx = xfs_trans_get_dqtrx(tp, dqp);
ASSERT(qtrx);
if (qtrx->qt_dquot == NULL)
qtrx->qt_dquot = dqp;
trace_xfs_trans_mod_dquot_before(qtrx);
trace_xfs_trans_mod_dquot(tp, dqp, field, delta);
switch (field) {
/* regular disk blk reservation */
case XFS_TRANS_DQ_RES_BLKS:
qtrx->qt_blk_res += delta;
break;
/* inode reservation */
case XFS_TRANS_DQ_RES_INOS:
qtrx->qt_ino_res += delta;
break;
/* disk blocks used. */
case XFS_TRANS_DQ_BCOUNT:
qtrx->qt_bcount_delta += delta;
break;
case XFS_TRANS_DQ_DELBCOUNT:
qtrx->qt_delbcnt_delta += delta;
break;
/* Inode Count */
case XFS_TRANS_DQ_ICOUNT:
if (qtrx->qt_ino_res && delta > 0) {
qtrx->qt_ino_res_used += delta;
ASSERT(qtrx->qt_ino_res >= qtrx->qt_ino_res_used);
}
qtrx->qt_icount_delta += delta;
break;
/* rtblk reservation */
case XFS_TRANS_DQ_RES_RTBLKS:
qtrx->qt_rtblk_res += delta;
break;
/* rtblk count */
case XFS_TRANS_DQ_RTBCOUNT:
if (qtrx->qt_rtblk_res && delta > 0) {
qtrx->qt_rtblk_res_used += delta;
ASSERT(qtrx->qt_rtblk_res >= qtrx->qt_rtblk_res_used);
}
qtrx->qt_rtbcount_delta += delta;
break;
case XFS_TRANS_DQ_DELRTBCOUNT:
qtrx->qt_delrtb_delta += delta;
break;
default:
ASSERT(0);
}
trace_xfs_trans_mod_dquot_after(qtrx);
}
/*
* Given an array of dqtrx structures, lock all the dquots associated and join
* them to the transaction, provided they have been modified.
*/
STATIC void
xfs_trans_dqlockedjoin(
struct xfs_trans *tp,
struct xfs_dqtrx *q)
{
unsigned int i;
ASSERT(q[0].qt_dquot != NULL);
if (q[1].qt_dquot == NULL) {
xfs_dqlock(q[0].qt_dquot);
xfs_trans_dqjoin(tp, q[0].qt_dquot);
} else if (q[2].qt_dquot == NULL) {
xfs_dqlock2(q[0].qt_dquot, q[1].qt_dquot);
xfs_trans_dqjoin(tp, q[0].qt_dquot);
xfs_trans_dqjoin(tp, q[1].qt_dquot);
} else {
xfs_dqlockn(q);
for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
if (q[i].qt_dquot == NULL)
break;
xfs_trans_dqjoin(tp, q[i].qt_dquot);
}
}
}
/* Apply dqtrx changes to the quota reservation counters. */
static inline void
xfs_apply_quota_reservation_deltas(
struct xfs_dquot_res *res,
uint64_t reserved,
int64_t res_used,
int64_t count_delta)
{
if (reserved != 0) {
/*
* Subtle math here: If reserved > res_used (the normal case),
* we're simply subtracting the unused transaction quota
* reservation from the dquot reservation.
*
* If, however, res_used > reserved, then we have allocated
* more quota blocks than were reserved for the transaction.
* We must add that excess to the dquot reservation since it
* tracks (usage + resv) and by definition we didn't reserve
* that excess.
*/
res->reserved -= abs(reserved - res_used);
} else if (count_delta != 0) {
/*
* These blks were never reserved, either inside a transaction
* or outside one (in a delayed allocation). Also, this isn't
* always a negative number since we sometimes deliberately
* skip quota reservations.
*/
res->reserved += count_delta;
}
}
#ifdef CONFIG_XFS_LIVE_HOOKS
/* Call downstream hooks now that it's time to apply dquot deltas. */
static inline void
xfs_trans_apply_dquot_deltas_hook(
struct xfs_trans *tp,
struct xfs_dquot *dqp)
{
if (xfs_hooks_switched_on(&xfs_dqtrx_hooks_switch)) {
struct xfs_apply_dqtrx_params p = {
.tx_id = (uintptr_t)tp,
.q_type = xfs_dquot_type(dqp),
.q_id = dqp->q_id,
};
struct xfs_quotainfo *qi = tp->t_mountp->m_quotainfo;
xfs_hooks_call(&qi->qi_apply_dqtrx_hooks,
XFS_APPLY_DQTRX_COMMIT, &p);
}
}
#else
# define xfs_trans_apply_dquot_deltas_hook(tp, dqp) ((void)0)
#endif /* CONFIG_XFS_LIVE_HOOKS */
/*
* Called by xfs_trans_commit() and similar in spirit to
* xfs_trans_apply_sb_deltas().
* Go thru all the dquots belonging to this transaction and modify the
* INCORE dquot to reflect the actual usages.
* Unreserve just the reservations done by this transaction.
* dquot is still left locked at exit.
*/
void
xfs_trans_apply_dquot_deltas(
struct xfs_trans *tp)
{
int i, j;
struct xfs_dquot *dqp;
struct xfs_dqtrx *qtrx, *qa;
int64_t totalbdelta;
int64_t totalrtbdelta;
if (!tp->t_dqinfo)
return;
ASSERT(tp->t_dqinfo);
for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
qa = tp->t_dqinfo->dqs[j];
if (qa[0].qt_dquot == NULL)
continue;
/*
* Lock all of the dquots and join them to the transaction.
*/
xfs_trans_dqlockedjoin(tp, qa);
for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
uint64_t blk_res_used;
qtrx = &qa[i];
/*
* The array of dquots is filled
* sequentially, not sparsely.
*/
if ((dqp = qtrx->qt_dquot) == NULL)
break;
ASSERT(XFS_DQ_IS_LOCKED(dqp));
xfs_trans_apply_dquot_deltas_hook(tp, dqp);
/*
* adjust the actual number of blocks used
*/
/*
* The issue here is - sometimes we don't make a blkquota
* reservation intentionally to be fair to users
* (when the amount is small). On the other hand,
* delayed allocs do make reservations, but that's
* outside of a transaction, so we have no
* idea how much was really reserved.
* So, here we've accumulated delayed allocation blks and
* non-delay blks. The assumption is that the
* delayed ones are always reserved (outside of a
* transaction), and the others may or may not have
* quota reservations.
*/
totalbdelta = qtrx->qt_bcount_delta +
qtrx->qt_delbcnt_delta;
totalrtbdelta = qtrx->qt_rtbcount_delta +
qtrx->qt_delrtb_delta;
if (totalbdelta != 0 || totalrtbdelta != 0 ||
qtrx->qt_icount_delta != 0) {
trace_xfs_trans_apply_dquot_deltas_before(dqp);
trace_xfs_trans_apply_dquot_deltas(qtrx);
}
#ifdef DEBUG
if (totalbdelta < 0)
ASSERT(dqp->q_blk.count >= -totalbdelta);
if (totalrtbdelta < 0)
ASSERT(dqp->q_rtb.count >= -totalrtbdelta);
if (qtrx->qt_icount_delta < 0)
ASSERT(dqp->q_ino.count >= -qtrx->qt_icount_delta);
#endif
if (totalbdelta)
dqp->q_blk.count += totalbdelta;
if (qtrx->qt_icount_delta)
dqp->q_ino.count += qtrx->qt_icount_delta;
if (totalrtbdelta)
dqp->q_rtb.count += totalrtbdelta;
if (totalbdelta != 0 || totalrtbdelta != 0 ||
qtrx->qt_icount_delta != 0)
trace_xfs_trans_apply_dquot_deltas_after(dqp);
/*
* Get any default limits in use.
* Start/reset the timer(s) if needed.
*/
if (dqp->q_id) {
xfs_qm_adjust_dqlimits(dqp);
xfs_qm_adjust_dqtimers(dqp);
}
dqp->q_flags |= XFS_DQFLAG_DIRTY;
/*
* add this to the list of items to get logged
*/
xfs_trans_log_dquot(tp, dqp);
/*
* Take off what's left of the original reservation.
* In case of delayed allocations, there's no
* reservation that a transaction structure knows of.
*/
blk_res_used = max_t(int64_t, 0, qtrx->qt_bcount_delta);
xfs_apply_quota_reservation_deltas(&dqp->q_blk,
qtrx->qt_blk_res, blk_res_used,
qtrx->qt_bcount_delta);
/*
* Adjust the RT reservation.
*/
xfs_apply_quota_reservation_deltas(&dqp->q_rtb,
qtrx->qt_rtblk_res,
qtrx->qt_rtblk_res_used,
qtrx->qt_rtbcount_delta);
/*
* Adjust the inode reservation.
*/
ASSERT(qtrx->qt_ino_res >= qtrx->qt_ino_res_used);
xfs_apply_quota_reservation_deltas(&dqp->q_ino,
qtrx->qt_ino_res,
qtrx->qt_ino_res_used,
qtrx->qt_icount_delta);
ASSERT(dqp->q_blk.reserved >= dqp->q_blk.count);
ASSERT(dqp->q_ino.reserved >= dqp->q_ino.count);
ASSERT(dqp->q_rtb.reserved >= dqp->q_rtb.count);
}
}
}
#ifdef CONFIG_XFS_LIVE_HOOKS
/* Call downstream hooks now that it's time to cancel dquot deltas. */
static inline void
xfs_trans_unreserve_and_mod_dquots_hook(
struct xfs_trans *tp,
struct xfs_dquot *dqp)
{
if (xfs_hooks_switched_on(&xfs_dqtrx_hooks_switch)) {
struct xfs_apply_dqtrx_params p = {
.tx_id = (uintptr_t)tp,
.q_type = xfs_dquot_type(dqp),
.q_id = dqp->q_id,
};
struct xfs_quotainfo *qi = tp->t_mountp->m_quotainfo;
xfs_hooks_call(&qi->qi_apply_dqtrx_hooks,
XFS_APPLY_DQTRX_UNRESERVE, &p);
}
}
#else
# define xfs_trans_unreserve_and_mod_dquots_hook(tp, dqp) ((void)0)
#endif /* CONFIG_XFS_LIVE_HOOKS */
/*
* Release the reservations, and adjust the dquots accordingly.
* This is called only when the transaction is being aborted. If by
* any chance we have done dquot modifications incore (ie. deltas) already,
* we simply throw those away, since that's the expected behavior
* when a transaction is curtailed without a commit.
*/
void
xfs_trans_unreserve_and_mod_dquots(
struct xfs_trans *tp)
{
int i, j;
struct xfs_dquot *dqp;
struct xfs_dqtrx *qtrx, *qa;
bool locked;
if (!tp->t_dqinfo)
return;
for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
qa = tp->t_dqinfo->dqs[j];
for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
qtrx = &qa[i];
/*
* We assume that the array of dquots is filled
* sequentially, not sparsely.
*/
if ((dqp = qtrx->qt_dquot) == NULL)
break;
xfs_trans_unreserve_and_mod_dquots_hook(tp, dqp);
/*
* Unreserve the original reservation. We don't care
* about the number of blocks used field, or deltas.
* Also we don't bother to zero the fields.
*/
locked = false;
if (qtrx->qt_blk_res) {
xfs_dqlock(dqp);
locked = true;
dqp->q_blk.reserved -=
(xfs_qcnt_t)qtrx->qt_blk_res;
}
if (qtrx->qt_ino_res) {
if (!locked) {
xfs_dqlock(dqp);
locked = true;
}
dqp->q_ino.reserved -=
(xfs_qcnt_t)qtrx->qt_ino_res;
}
if (qtrx->qt_rtblk_res) {
if (!locked) {
xfs_dqlock(dqp);
locked = true;
}
dqp->q_rtb.reserved -=
(xfs_qcnt_t)qtrx->qt_rtblk_res;
}
if (locked)
xfs_dqunlock(dqp);
}
}
}
STATIC void
xfs_quota_warn(
struct xfs_mount *mp,
struct xfs_dquot *dqp,
int type)
{
enum quota_type qtype;
switch (xfs_dquot_type(dqp)) {
case XFS_DQTYPE_PROJ:
qtype = PRJQUOTA;
break;
case XFS_DQTYPE_USER:
qtype = USRQUOTA;
break;
case XFS_DQTYPE_GROUP:
qtype = GRPQUOTA;
break;
default:
return;
}
quota_send_warning(make_kqid(&init_user_ns, qtype, dqp->q_id),
mp->m_super->s_dev, type);
}
/*
* Decide if we can make an additional reservation against a quota resource.
* Returns an inode QUOTA_NL_ warning code and whether or not it's fatal.
*
* Note that we assume that the numeric difference between the inode and block
* warning codes will always be 3 since it's userspace ABI now, and will never
* decrease the quota reservation, so the *BELOW messages are irrelevant.
*/
static inline int
xfs_dqresv_check(
struct xfs_dquot_res *res,
struct xfs_quota_limits *qlim,
int64_t delta,
bool *fatal)
{
xfs_qcnt_t hardlimit = res->hardlimit;
xfs_qcnt_t softlimit = res->softlimit;
xfs_qcnt_t total_count = res->reserved + delta;
BUILD_BUG_ON(QUOTA_NL_BHARDWARN != QUOTA_NL_IHARDWARN + 3);
BUILD_BUG_ON(QUOTA_NL_BSOFTLONGWARN != QUOTA_NL_ISOFTLONGWARN + 3);
BUILD_BUG_ON(QUOTA_NL_BSOFTWARN != QUOTA_NL_ISOFTWARN + 3);
*fatal = false;
if (delta <= 0)
return QUOTA_NL_NOWARN;
if (!hardlimit)
hardlimit = qlim->hard;
if (!softlimit)
softlimit = qlim->soft;
if (hardlimit && total_count > hardlimit) {
*fatal = true;
return QUOTA_NL_IHARDWARN;
}
if (softlimit && total_count > softlimit) {
time64_t now = ktime_get_real_seconds();
if (res->timer != 0 && now > res->timer) {
*fatal = true;
return QUOTA_NL_ISOFTLONGWARN;
}
return QUOTA_NL_ISOFTWARN;
}
return QUOTA_NL_NOWARN;
}
/*
* This reserves disk blocks and inodes against a dquot.
* Flags indicate if the dquot is to be locked here and also
* if the blk reservation is for RT or regular blocks.
* Sending in XFS_QMOPT_FORCE_RES flag skips the quota check.
*/
STATIC int
xfs_trans_dqresv(
struct xfs_trans *tp,
struct xfs_mount *mp,
struct xfs_dquot *dqp,
int64_t nblks,
long ninos,
uint flags)
{
struct xfs_quotainfo *q = mp->m_quotainfo;
struct xfs_def_quota *defq;
struct xfs_dquot_res *blkres;
struct xfs_quota_limits *qlim;
xfs_dqlock(dqp);
defq = xfs_get_defquota(q, xfs_dquot_type(dqp));
if (flags & XFS_TRANS_DQ_RES_BLKS) {
blkres = &dqp->q_blk;
qlim = &defq->blk;
} else {
blkres = &dqp->q_rtb;
qlim = &defq->rtb;
}
if ((flags & XFS_QMOPT_FORCE_RES) == 0 && dqp->q_id &&
xfs_dquot_is_enforced(dqp)) {
int quota_nl;
bool fatal;
/*
* dquot is locked already. See if we'd go over the hardlimit
* or exceed the timelimit if we'd reserve resources.
*/
quota_nl = xfs_dqresv_check(blkres, qlim, nblks, &fatal);
if (quota_nl != QUOTA_NL_NOWARN) {
/*
* Quota block warning codes are 3 more than the inode
* codes, which we check above.
*/
xfs_quota_warn(mp, dqp, quota_nl + 3);
if (fatal)
goto error_return;
}
quota_nl = xfs_dqresv_check(&dqp->q_ino, &defq->ino, ninos,
&fatal);
if (quota_nl != QUOTA_NL_NOWARN) {
xfs_quota_warn(mp, dqp, quota_nl);
if (fatal)
goto error_return;
}
}
/*
* Change the reservation, but not the actual usage.
* Note that q_blk.reserved = q_blk.count + resv
*/
blkres->reserved += (xfs_qcnt_t)nblks;
dqp->q_ino.reserved += (xfs_qcnt_t)ninos;
/*
* note the reservation amt in the trans struct too,
* so that the transaction knows how much was reserved by
* it against this particular dquot.
* We don't do this when we are reserving for a delayed allocation,
* because we don't have the luxury of a transaction envelope then.
*/
if (tp) {
ASSERT(flags & XFS_QMOPT_RESBLK_MASK);
xfs_trans_mod_dquot(tp, dqp, flags & XFS_QMOPT_RESBLK_MASK,
nblks);
xfs_trans_mod_dquot(tp, dqp, XFS_TRANS_DQ_RES_INOS, ninos);
}
if (XFS_IS_CORRUPT(mp, dqp->q_blk.reserved < dqp->q_blk.count) ||
XFS_IS_CORRUPT(mp, dqp->q_rtb.reserved < dqp->q_rtb.count) ||
XFS_IS_CORRUPT(mp, dqp->q_ino.reserved < dqp->q_ino.count))
goto error_corrupt;
xfs_dqunlock(dqp);
return 0;
error_return:
xfs_dqunlock(dqp);
if (xfs_dquot_type(dqp) == XFS_DQTYPE_PROJ)
return -ENOSPC;
return -EDQUOT;
error_corrupt:
xfs_dqunlock(dqp);
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
xfs_fs_mark_sick(mp, XFS_SICK_FS_QUOTACHECK);
return -EFSCORRUPTED;
}
/*
* Given dquot(s), make disk block and/or inode reservations against them.
* The fact that this does the reservation against user, group and
* project quotas is important, because this follows a all-or-nothing
* approach.
*
* flags = XFS_QMOPT_FORCE_RES evades limit enforcement. Used by chown.
* XFS_QMOPT_ENOSPC returns ENOSPC not EDQUOT. Used by pquota.
* XFS_TRANS_DQ_RES_BLKS reserves regular disk blocks
* XFS_TRANS_DQ_RES_RTBLKS reserves realtime disk blocks
* dquots are unlocked on return, if they were not locked by caller.
*/
int
xfs_trans_reserve_quota_bydquots(
struct xfs_trans *tp,
struct xfs_mount *mp,
struct xfs_dquot *udqp,
struct xfs_dquot *gdqp,
struct xfs_dquot *pdqp,
int64_t nblks,
long ninos,
uint flags)
{
int error;
if (!XFS_IS_QUOTA_ON(mp))
return 0;
ASSERT(flags & XFS_QMOPT_RESBLK_MASK);
if (udqp) {
error = xfs_trans_dqresv(tp, mp, udqp, nblks, ninos, flags);
if (error)
return error;
}
if (gdqp) {
error = xfs_trans_dqresv(tp, mp, gdqp, nblks, ninos, flags);
if (error)
goto unwind_usr;
}
if (pdqp) {
error = xfs_trans_dqresv(tp, mp, pdqp, nblks, ninos, flags);
if (error)
goto unwind_grp;
}
/*
* Didn't change anything critical, so, no need to log
*/
return 0;
unwind_grp:
flags |= XFS_QMOPT_FORCE_RES;
if (gdqp)
xfs_trans_dqresv(tp, mp, gdqp, -nblks, -ninos, flags);
unwind_usr:
flags |= XFS_QMOPT_FORCE_RES;
if (udqp)
xfs_trans_dqresv(tp, mp, udqp, -nblks, -ninos, flags);
return error;
}
/*
* Lock the dquot and change the reservation if we can.
* This doesn't change the actual usage, just the reservation.
* The inode sent in is locked.
*/
int
xfs_trans_reserve_quota_nblks(
struct xfs_trans *tp,
struct xfs_inode *ip,
int64_t dblocks,
int64_t rblocks,
bool force)
{
struct xfs_mount *mp = ip->i_mount;
unsigned int qflags = 0;
int error;
if (!XFS_IS_QUOTA_ON(mp))
return 0;
ASSERT(!xfs_is_quota_inode(&mp->m_sb, ip->i_ino));
xfs_assert_ilocked(ip, XFS_ILOCK_EXCL);
if (force)
qflags |= XFS_QMOPT_FORCE_RES;
/* Reserve data device quota against the inode's dquots. */
error = xfs_trans_reserve_quota_bydquots(tp, mp, ip->i_udquot,
ip->i_gdquot, ip->i_pdquot, dblocks, 0,
XFS_QMOPT_RES_REGBLKS | qflags);
if (error)
return error;
/* Do the same but for realtime blocks. */
error = xfs_trans_reserve_quota_bydquots(tp, mp, ip->i_udquot,
ip->i_gdquot, ip->i_pdquot, rblocks, 0,
XFS_QMOPT_RES_RTBLKS | qflags);
if (error) {
xfs_trans_reserve_quota_bydquots(tp, mp, ip->i_udquot,
ip->i_gdquot, ip->i_pdquot, -dblocks, 0,
XFS_QMOPT_RES_REGBLKS);
return error;
}
return 0;
}
/* Change the quota reservations for an inode creation activity. */
int
xfs_trans_reserve_quota_icreate(
struct xfs_trans *tp,
struct xfs_dquot *udqp,
struct xfs_dquot *gdqp,
struct xfs_dquot *pdqp,
int64_t dblocks)
{
struct xfs_mount *mp = tp->t_mountp;
if (!XFS_IS_QUOTA_ON(mp))
return 0;
return xfs_trans_reserve_quota_bydquots(tp, mp, udqp, gdqp, pdqp,
dblocks, 1, XFS_QMOPT_RES_REGBLKS);
}
STATIC void
xfs_trans_alloc_dqinfo(
xfs_trans_t *tp)
{
tp->t_dqinfo = kmem_cache_zalloc(xfs_dqtrx_cache,
GFP_KERNEL | __GFP_NOFAIL);
}
void
xfs_trans_free_dqinfo(
xfs_trans_t *tp)
{
if (!tp->t_dqinfo)
return;
kmem_cache_free(xfs_dqtrx_cache, tp->t_dqinfo);
tp->t_dqinfo = NULL;
}
Codebase Browser
linux