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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /fs/xfs/xfs_trans_dquot.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/xfs/xfs_trans_dquot.c')
-rw-r--r--fs/xfs/xfs_trans_dquot.c859
1 files changed, 859 insertions, 0 deletions
diff --git a/fs/xfs/xfs_trans_dquot.c b/fs/xfs/xfs_trans_dquot.c
new file mode 100644
index 0000000000..aa00cf67ad
--- /dev/null
+++ b/fs/xfs/xfs_trans_dquot.c
@@ -0,0 +1,859 @@
+// 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"
+
+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;
+
+ }
+ }
+}
+
+/*
+ * 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)
+ (void) xfs_trans_mod_dquot(tp, ip->i_udquot, field, delta);
+ if (XFS_IS_GQUOTA_ON(mp) && ip->i_gdquot)
+ (void) xfs_trans_mod_dquot(tp, ip->i_gdquot, field, delta);
+ if (XFS_IS_PQUOTA_ON(mp) && ip->i_pdquot)
+ (void) xfs_trans_mod_dquot(tp, 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. We know that the
+ * highest number of dquots of one type - usr, grp and prj - involved in a
+ * transaction is 3 so we don't need to make this very generic.
+ */
+STATIC void
+xfs_trans_dqlockedjoin(
+ struct xfs_trans *tp,
+ struct xfs_dqtrx *q)
+{
+ 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 {
+ ASSERT(XFS_QM_TRANS_MAXDQS == 2);
+ 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);
+ }
+}
+
+/* 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;
+ }
+}
+
+/*
+ * 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));
+
+ /*
+ * 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);
+ }
+ }
+}
+
+/*
+ * 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;
+ /*
+ * 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);
+ 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));
+ ASSERT(xfs_isilocked(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;
+}