--- /dev/null
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License version 2.
+ */
+
+/*
+ * Quota change tags are associated with each transaction that allocates or
+ * deallocates space. Those changes are accumulated locally to each node (in a
+ * per-node file) and then are periodically synced to the quota file. This
+ * avoids the bottleneck of constantly touching the quota file, but introduces
+ * fuzziness in the current usage value of IDs that are being used on different
+ * nodes in the cluster simultaneously. So, it is possible for a user on
+ * multiple nodes to overrun their quota, but that overrun is controlable.
+ * Since quota tags are part of transactions, there is no need for a quota check
+ * program to be run on node crashes or anything like that.
+ *
+ * There are couple of knobs that let the administrator manage the quota
+ * fuzziness. "quota_quantum" sets the maximum time a quota change can be
+ * sitting on one node before being synced to the quota file. (The default is
+ * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency
+ * of quota file syncs increases as the user moves closer to their limit. The
+ * more frequent the syncs, the more accurate the quota enforcement, but that
+ * means that there is more contention between the nodes for the quota file.
+ * The default value is one. This sets the maximum theoretical quota overrun
+ * (with infinite node with infinite bandwidth) to twice the user's limit. (In
+ * practice, the maximum overrun you see should be much less.) A "quota_scale"
+ * number greater than one makes quota syncs more frequent and reduces the
+ * maximum overrun. Numbers less than one (but greater than zero) make quota
+ * syncs less frequent.
+ *
+ * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
+ * the quota file, so it is not being constantly read.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/sort.h>
+#include <linux/fs.h>
+#include <linux/bio.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/quota.h>
+#include <linux/dqblk_xfs.h>
+#include <linux/lockref.h>
+#include <linux/list_lru.h>
+#include <linux/rcupdate.h>
+#include <linux/rculist_bl.h>
+#include <linux/bit_spinlock.h>
+#include <linux/jhash.h>
+#include <linux/vmalloc.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "bmap.h"
+#include "glock.h"
+#include "glops.h"
+#include "log.h"
+#include "meta_io.h"
+#include "quota.h"
+#include "rgrp.h"
+#include "super.h"
+#include "trans.h"
+#include "inode.h"
+#include "util.h"
+
+#define GFS2_QD_HASH_SHIFT 12
+#define GFS2_QD_HASH_SIZE (1 << GFS2_QD_HASH_SHIFT)
+#define GFS2_QD_HASH_MASK (GFS2_QD_HASH_SIZE - 1)
+
+/* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
+/* -> sd_bitmap_lock */
+static DEFINE_SPINLOCK(qd_lock);
+struct list_lru gfs2_qd_lru;
+
+static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
+
+static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
+ const struct kqid qid)
+{
+ unsigned int h;
+
+ h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
+ h = jhash(&qid, sizeof(struct kqid), h);
+
+ return h & GFS2_QD_HASH_MASK;
+}
+
+static inline void spin_lock_bucket(unsigned int hash)
+{
+ hlist_bl_lock(&qd_hash_table[hash]);
+}
+
+static inline void spin_unlock_bucket(unsigned int hash)
+{
+ hlist_bl_unlock(&qd_hash_table[hash]);
+}
+
+static void gfs2_qd_dealloc(struct rcu_head *rcu)
+{
+ struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
+ kmem_cache_free(gfs2_quotad_cachep, qd);
+}
+
+static void gfs2_qd_dispose(struct list_head *list)
+{
+ struct gfs2_quota_data *qd;
+ struct gfs2_sbd *sdp;
+
+ while (!list_empty(list)) {
+ qd = list_entry(list->next, struct gfs2_quota_data, qd_lru);
+ sdp = qd->qd_gl->gl_sbd;
+
+ list_del(&qd->qd_lru);
+
+ /* Free from the filesystem-specific list */
+ spin_lock(&qd_lock);
+ list_del(&qd->qd_list);
+ spin_unlock(&qd_lock);
+
+ spin_lock_bucket(qd->qd_hash);
+ hlist_bl_del_rcu(&qd->qd_hlist);
+ spin_unlock_bucket(qd->qd_hash);
+
+ gfs2_assert_warn(sdp, !qd->qd_change);
+ gfs2_assert_warn(sdp, !qd->qd_slot_count);
+ gfs2_assert_warn(sdp, !qd->qd_bh_count);
+
+ gfs2_glock_put(qd->qd_gl);
+ atomic_dec(&sdp->sd_quota_count);
+
+ /* Delete it from the common reclaim list */
+ call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
+ }
+}
+
+
+static enum lru_status gfs2_qd_isolate(struct list_head *item,
+ struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
+{
+ struct list_head *dispose = arg;
+ struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
+
+ if (!spin_trylock(&qd->qd_lockref.lock))
+ return LRU_SKIP;
+
+ if (qd->qd_lockref.count == 0) {
+ lockref_mark_dead(&qd->qd_lockref);
+ list_lru_isolate_move(lru, &qd->qd_lru, dispose);
+ }
+
+ spin_unlock(&qd->qd_lockref.lock);
+ return LRU_REMOVED;
+}
+
+static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
+ struct shrink_control *sc)
+{
+ LIST_HEAD(dispose);
+ unsigned long freed;
+
+ if (!(sc->gfp_mask & __GFP_FS))
+ return SHRINK_STOP;
+
+ freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
+ gfs2_qd_isolate, &dispose);
+
+ gfs2_qd_dispose(&dispose);
+
+ return freed;
+}
+
+static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
+ struct shrink_control *sc)
+{
+ return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
+}
+
+struct shrinker gfs2_qd_shrinker = {
+ .count_objects = gfs2_qd_shrink_count,
+ .scan_objects = gfs2_qd_shrink_scan,
+ .seeks = DEFAULT_SEEKS,
+ .flags = SHRINKER_NUMA_AWARE,
+};
+
+
+static u64 qd2index(struct gfs2_quota_data *qd)
+{
+ struct kqid qid = qd->qd_id;
+ return (2 * (u64)from_kqid(&init_user_ns, qid)) +
+ ((qid.type == USRQUOTA) ? 0 : 1);
+}
+
+static u64 qd2offset(struct gfs2_quota_data *qd)
+{
+ u64 offset;
+
+ offset = qd2index(qd);
+ offset *= sizeof(struct gfs2_quota);
+
+ return offset;
+}
+
+static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
+{
+ struct gfs2_quota_data *qd;
+ int error;
+
+ qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
+ if (!qd)
+ return NULL;
+
+ qd->qd_sbd = sdp;
+ qd->qd_lockref.count = 1;
+ spin_lock_init(&qd->qd_lockref.lock);
+ qd->qd_id = qid;
+ qd->qd_slot = -1;
+ INIT_LIST_HEAD(&qd->qd_lru);
+ qd->qd_hash = hash;
+
+ error = gfs2_glock_get(sdp, qd2index(qd),
+ &gfs2_quota_glops, CREATE, &qd->qd_gl);
+ if (error)
+ goto fail;
+
+ return qd;
+
+fail:
+ kmem_cache_free(gfs2_quotad_cachep, qd);
+ return NULL;
+}
+
+static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
+ const struct gfs2_sbd *sdp,
+ struct kqid qid)
+{
+ struct gfs2_quota_data *qd;
+ struct hlist_bl_node *h;
+
+ hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
+ if (!qid_eq(qd->qd_id, qid))
+ continue;
+ if (qd->qd_sbd != sdp)
+ continue;
+ if (lockref_get_not_dead(&qd->qd_lockref)) {
+ list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
+ return qd;
+ }
+ }
+
+ return NULL;
+}
+
+
+static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
+ struct gfs2_quota_data **qdp)
+{
+ struct gfs2_quota_data *qd, *new_qd;
+ unsigned int hash = gfs2_qd_hash(sdp, qid);
+
+ rcu_read_lock();
+ *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
+ rcu_read_unlock();
+
+ if (qd)
+ return 0;
+
+ new_qd = qd_alloc(hash, sdp, qid);
+ if (!new_qd)
+ return -ENOMEM;
+
+ spin_lock(&qd_lock);
+ spin_lock_bucket(hash);
+ *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
+ if (qd == NULL) {
+ *qdp = new_qd;
+ list_add(&new_qd->qd_list, &sdp->sd_quota_list);
+ hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
+ atomic_inc(&sdp->sd_quota_count);
+ }
+ spin_unlock_bucket(hash);
+ spin_unlock(&qd_lock);
+
+ if (qd) {
+ gfs2_glock_put(new_qd->qd_gl);
+ kmem_cache_free(gfs2_quotad_cachep, new_qd);
+ }
+
+ return 0;
+}
+
+
+static void qd_hold(struct gfs2_quota_data *qd)
+{
+ struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+ gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
+ lockref_get(&qd->qd_lockref);
+}
+
+static void qd_put(struct gfs2_quota_data *qd)
+{
+ if (lockref_put_or_lock(&qd->qd_lockref))
+ return;
+
+ qd->qd_lockref.count = 0;
+ list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
+ spin_unlock(&qd->qd_lockref.lock);
+
+}
+
+static int slot_get(struct gfs2_quota_data *qd)
+{
+ struct gfs2_sbd *sdp = qd->qd_sbd;
+ unsigned int bit;
+ int error = 0;
+
+ spin_lock(&sdp->sd_bitmap_lock);
+ if (qd->qd_slot_count != 0)
+ goto out;
+
+ error = -ENOSPC;
+ bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
+ if (bit < sdp->sd_quota_slots) {
+ set_bit(bit, sdp->sd_quota_bitmap);
+ qd->qd_slot = bit;
+ error = 0;
+out:
+ qd->qd_slot_count++;
+ }
+ spin_unlock(&sdp->sd_bitmap_lock);
+
+ return error;
+}
+
+static void slot_hold(struct gfs2_quota_data *qd)
+{
+ struct gfs2_sbd *sdp = qd->qd_sbd;
+
+ spin_lock(&sdp->sd_bitmap_lock);
+ gfs2_assert(sdp, qd->qd_slot_count);
+ qd->qd_slot_count++;
+ spin_unlock(&sdp->sd_bitmap_lock);
+}
+
+static void slot_put(struct gfs2_quota_data *qd)
+{
+ struct gfs2_sbd *sdp = qd->qd_sbd;
+
+ spin_lock(&sdp->sd_bitmap_lock);
+ gfs2_assert(sdp, qd->qd_slot_count);
+ if (!--qd->qd_slot_count) {
+ BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
+ qd->qd_slot = -1;
+ }
+ spin_unlock(&sdp->sd_bitmap_lock);
+}
+
+static int bh_get(struct gfs2_quota_data *qd)
+{
+ struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+ struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
+ unsigned int block, offset;
+ struct buffer_head *bh;
+ int error;
+ struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
+
+ mutex_lock(&sdp->sd_quota_mutex);
+
+ if (qd->qd_bh_count++) {
+ mutex_unlock(&sdp->sd_quota_mutex);
+ return 0;
+ }
+
+ block = qd->qd_slot / sdp->sd_qc_per_block;
+ offset = qd->qd_slot % sdp->sd_qc_per_block;
+
+ bh_map.b_size = 1 << ip->i_inode.i_blkbits;
+ error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
+ if (error)
+ goto fail;
+ error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
+ if (error)
+ goto fail;
+ error = -EIO;
+ if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
+ goto fail_brelse;
+
+ qd->qd_bh = bh;
+ qd->qd_bh_qc = (struct gfs2_quota_change *)
+ (bh->b_data + sizeof(struct gfs2_meta_header) +
+ offset * sizeof(struct gfs2_quota_change));
+
+ mutex_unlock(&sdp->sd_quota_mutex);
+
+ return 0;
+
+fail_brelse:
+ brelse(bh);
+fail:
+ qd->qd_bh_count--;
+ mutex_unlock(&sdp->sd_quota_mutex);
+ return error;
+}
+
+static void bh_put(struct gfs2_quota_data *qd)
+{
+ struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+
+ mutex_lock(&sdp->sd_quota_mutex);
+ gfs2_assert(sdp, qd->qd_bh_count);
+ if (!--qd->qd_bh_count) {
+ brelse(qd->qd_bh);
+ qd->qd_bh = NULL;
+ qd->qd_bh_qc = NULL;
+ }
+ mutex_unlock(&sdp->sd_quota_mutex);
+}
+
+static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
+ u64 *sync_gen)
+{
+ if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
+ !test_bit(QDF_CHANGE, &qd->qd_flags) ||
+ (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
+ return 0;
+
+ if (!lockref_get_not_dead(&qd->qd_lockref))
+ return 0;
+
+ list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
+ set_bit(QDF_LOCKED, &qd->qd_flags);
+ qd->qd_change_sync = qd->qd_change;
+ slot_hold(qd);
+ return 1;
+}
+
+static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
+{
+ struct gfs2_quota_data *qd = NULL;
+ int error;
+ int found = 0;
+
+ *qdp = NULL;
+
+ if (sdp->sd_vfs->s_flags & MS_RDONLY)
+ return 0;
+
+ spin_lock(&qd_lock);
+
+ list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
+ found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
+ if (found)
+ break;
+ }
+
+ if (!found)
+ qd = NULL;
+
+ spin_unlock(&qd_lock);
+
+ if (qd) {
+ gfs2_assert_warn(sdp, qd->qd_change_sync);
+ error = bh_get(qd);
+ if (error) {
+ clear_bit(QDF_LOCKED, &qd->qd_flags);
+ slot_put(qd);
+ qd_put(qd);
+ return error;
+ }
+ }
+
+ *qdp = qd;
+
+ return 0;
+}
+
+static void qd_unlock(struct gfs2_quota_data *qd)
+{
+ gfs2_assert_warn(qd->qd_gl->gl_sbd,
+ test_bit(QDF_LOCKED, &qd->qd_flags));
+ clear_bit(QDF_LOCKED, &qd->qd_flags);
+ bh_put(qd);
+ slot_put(qd);
+ qd_put(qd);
+}
+
+static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
+ struct gfs2_quota_data **qdp)
+{
+ int error;
+
+ error = qd_get(sdp, qid, qdp);
+ if (error)
+ return error;
+
+ error = slot_get(*qdp);
+ if (error)
+ goto fail;
+
+ error = bh_get(*qdp);
+ if (error)
+ goto fail_slot;
+
+ return 0;
+
+fail_slot:
+ slot_put(*qdp);
+fail:
+ qd_put(*qdp);
+ return error;
+}
+
+static void qdsb_put(struct gfs2_quota_data *qd)
+{
+ bh_put(qd);
+ slot_put(qd);
+ qd_put(qd);
+}
+
+int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+ struct gfs2_quota_data **qd;
+ int error;
+
+ if (ip->i_res == NULL) {
+ error = gfs2_rs_alloc(ip);
+ if (error)
+ return error;
+ }
+
+ qd = ip->i_res->rs_qa_qd;
+
+ if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
+ gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
+ return -EIO;
+
+ if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
+ return 0;
+
+ error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
+ if (error)
+ goto out;
+ ip->i_res->rs_qa_qd_num++;
+ qd++;
+
+ error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
+ if (error)
+ goto out;
+ ip->i_res->rs_qa_qd_num++;
+ qd++;
+
+ if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
+ !uid_eq(uid, ip->i_inode.i_uid)) {
+ error = qdsb_get(sdp, make_kqid_uid(uid), qd);
+ if (error)
+ goto out;
+ ip->i_res->rs_qa_qd_num++;
+ qd++;
+ }
+
+ if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
+ !gid_eq(gid, ip->i_inode.i_gid)) {
+ error = qdsb_get(sdp, make_kqid_gid(gid), qd);
+ if (error)
+ goto out;
+ ip->i_res->rs_qa_qd_num++;
+ qd++;
+ }
+
+out:
+ if (error)
+ gfs2_quota_unhold(ip);
+ return error;
+}
+
+void gfs2_quota_unhold(struct gfs2_inode *ip)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+ unsigned int x;
+
+ if (ip->i_res == NULL)
+ return;
+ gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
+
+ for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
+ qdsb_put(ip->i_res->rs_qa_qd[x]);
+ ip->i_res->rs_qa_qd[x] = NULL;
+ }
+ ip->i_res->rs_qa_qd_num = 0;
+}
+
+static int sort_qd(const void *a, const void *b)
+{
+ const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
+ const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
+
+ if (qid_lt(qd_a->qd_id, qd_b->qd_id))
+ return -1;
+ if (qid_lt(qd_b->qd_id, qd_a->qd_id))
+ return 1;
+ return 0;
+}
+
+static void do_qc(struct gfs2_quota_data *qd, s64 change)
+{
+ struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+ struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
+ struct gfs2_quota_change *qc = qd->qd_bh_qc;
+ s64 x;
+
+ mutex_lock(&sdp->sd_quota_mutex);
+ gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
+
+ if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
+ qc->qc_change = 0;
+ qc->qc_flags = 0;
+ if (qd->qd_id.type == USRQUOTA)
+ qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
+ qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
+ }
+
+ x = be64_to_cpu(qc->qc_change) + change;
+ qc->qc_change = cpu_to_be64(x);
+
+ spin_lock(&qd_lock);
+ qd->qd_change = x;
+ spin_unlock(&qd_lock);
+
+ if (!x) {
+ gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
+ clear_bit(QDF_CHANGE, &qd->qd_flags);
+ qc->qc_flags = 0;
+ qc->qc_id = 0;
+ slot_put(qd);
+ qd_put(qd);
+ } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
+ qd_hold(qd);
+ slot_hold(qd);
+ }
+
+ mutex_unlock(&sdp->sd_quota_mutex);
+}
+
+/**
+ * gfs2_adjust_quota - adjust record of current block usage
+ * @ip: The quota inode
+ * @loc: Offset of the entry in the quota file
+ * @change: The amount of usage change to record
+ * @qd: The quota data
+ * @fdq: The updated limits to record
+ *
+ * This function was mostly borrowed from gfs2_block_truncate_page which was
+ * in turn mostly borrowed from ext3
+ *
+ * Returns: 0 or -ve on error
+ */
+
+static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
+ s64 change, struct gfs2_quota_data *qd,
+ struct qc_dqblk *fdq)
+{
+ struct inode *inode = &ip->i_inode;
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ struct address_space *mapping = inode->i_mapping;
+ unsigned long index = loc >> PAGE_CACHE_SHIFT;
+ unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
+ unsigned blocksize, iblock, pos;
+ struct buffer_head *bh;
+ struct page *page;
+ void *kaddr, *ptr;
+ struct gfs2_quota q;
+ int err, nbytes;
+ u64 size;
+
+ if (gfs2_is_stuffed(ip)) {
+ err = gfs2_unstuff_dinode(ip, NULL);
+ if (err)
+ return err;
+ }
+
+ memset(&q, 0, sizeof(struct gfs2_quota));
+ err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
+ if (err < 0)
+ return err;
+
+ err = -EIO;
+ be64_add_cpu(&q.qu_value, change);
+ qd->qd_qb.qb_value = q.qu_value;
+ if (fdq) {
+ if (fdq->d_fieldmask & QC_SPC_SOFT) {
+ q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
+ qd->qd_qb.qb_warn = q.qu_warn;
+ }
+ if (fdq->d_fieldmask & QC_SPC_HARD) {
+ q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
+ qd->qd_qb.qb_limit = q.qu_limit;
+ }
+ if (fdq->d_fieldmask & QC_SPACE) {
+ q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
+ qd->qd_qb.qb_value = q.qu_value;
+ }
+ }
+
+ /* Write the quota into the quota file on disk */
+ ptr = &q;
+ nbytes = sizeof(struct gfs2_quota);
+get_a_page:
+ page = find_or_create_page(mapping, index, GFP_NOFS);
+ if (!page)
+ return -ENOMEM;
+
+ blocksize = inode->i_sb->s_blocksize;
+ iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
+
+ if (!page_has_buffers(page))
+ create_empty_buffers(page, blocksize, 0);
+
+ bh = page_buffers(page);
+ pos = blocksize;
+ while (offset >= pos) {
+ bh = bh->b_this_page;
+ iblock++;
+ pos += blocksize;
+ }
+
+ if (!buffer_mapped(bh)) {
+ gfs2_block_map(inode, iblock, bh, 1);
+ if (!buffer_mapped(bh))
+ goto unlock_out;
+ /* If it's a newly allocated disk block for quota, zero it */
+ if (buffer_new(bh))
+ zero_user(page, pos - blocksize, bh->b_size);
+ }
+
+ if (PageUptodate(page))
+ set_buffer_uptodate(bh);
+
+ if (!buffer_uptodate(bh)) {
+ ll_rw_block(READ | REQ_META, 1, &bh);
+ wait_on_buffer(bh);
+ if (!buffer_uptodate(bh))
+ goto unlock_out;
+ }
+
+ gfs2_trans_add_data(ip->i_gl, bh);
+
+ kaddr = kmap_atomic(page);
+ if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
+ nbytes = PAGE_CACHE_SIZE - offset;
+ memcpy(kaddr + offset, ptr, nbytes);
+ flush_dcache_page(page);
+ kunmap_atomic(kaddr);
+ unlock_page(page);
+ page_cache_release(page);
+
+ /* If quota straddles page boundary, we need to update the rest of the
+ * quota at the beginning of the next page */
+ if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
+ ptr = ptr + nbytes;
+ nbytes = sizeof(struct gfs2_quota) - nbytes;
+ offset = 0;
+ index++;
+ goto get_a_page;
+ }
+
+ size = loc + sizeof(struct gfs2_quota);
+ if (size > inode->i_size)
+ i_size_write(inode, size);
+ inode->i_mtime = inode->i_atime = CURRENT_TIME;
+ mark_inode_dirty(inode);
+ set_bit(QDF_REFRESH, &qd->qd_flags);
+ return 0;
+
+unlock_out:
+ unlock_page(page);
+ page_cache_release(page);
+ return err;
+}
+
+static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
+{
+ struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
+ struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
+ struct gfs2_alloc_parms ap = { .aflags = 0, };
+ unsigned int data_blocks, ind_blocks;
+ struct gfs2_holder *ghs, i_gh;
+ unsigned int qx, x;
+ struct gfs2_quota_data *qd;
+ unsigned reserved;
+ loff_t offset;
+ unsigned int nalloc = 0, blocks;
+ int error;
+
+ error = gfs2_rs_alloc(ip);
+ if (error)
+ return error;
+
+ gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
+ &data_blocks, &ind_blocks);
+
+ ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
+ if (!ghs)
+ return -ENOMEM;
+
+ sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
+ mutex_lock(&ip->i_inode.i_mutex);
+ for (qx = 0; qx < num_qd; qx++) {
+ error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
+ GL_NOCACHE, &ghs[qx]);
+ if (error)
+ goto out;
+ }
+
+ error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
+ if (error)
+ goto out;
+
+ for (x = 0; x < num_qd; x++) {
+ offset = qd2offset(qda[x]);
+ if (gfs2_write_alloc_required(ip, offset,
+ sizeof(struct gfs2_quota)))
+ nalloc++;
+ }
+
+ /*
+ * 1 blk for unstuffing inode if stuffed. We add this extra
+ * block to the reservation unconditionally. If the inode
+ * doesn't need unstuffing, the block will be released to the
+ * rgrp since it won't be allocated during the transaction
+ */
+ /* +3 in the end for unstuffing block, inode size update block
+ * and another block in case quota straddles page boundary and
+ * two blocks need to be updated instead of 1 */
+ blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
+
+ reserved = 1 + (nalloc * (data_blocks + ind_blocks));
+ ap.target = reserved;
+ error = gfs2_inplace_reserve(ip, &ap);
+ if (error)
+ goto out_alloc;
+
+ if (nalloc)
+ blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
+
+ error = gfs2_trans_begin(sdp, blocks, 0);
+ if (error)
+ goto out_ipres;
+
+ for (x = 0; x < num_qd; x++) {
+ qd = qda[x];
+ offset = qd2offset(qd);
+ error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
+ if (error)
+ goto out_end_trans;
+
+ do_qc(qd, -qd->qd_change_sync);
+ set_bit(QDF_REFRESH, &qd->qd_flags);
+ }
+
+ error = 0;
+
+out_end_trans:
+ gfs2_trans_end(sdp);
+out_ipres:
+ gfs2_inplace_release(ip);
+out_alloc:
+ gfs2_glock_dq_uninit(&i_gh);
+out:
+ while (qx--)
+ gfs2_glock_dq_uninit(&ghs[qx]);
+ mutex_unlock(&ip->i_inode.i_mutex);
+ kfree(ghs);
+ gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl, NORMAL_FLUSH);
+ return error;
+}
+
+static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
+{
+ struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
+ struct gfs2_quota q;
+ struct gfs2_quota_lvb *qlvb;
+ loff_t pos;
+ int error;
+
+ memset(&q, 0, sizeof(struct gfs2_quota));
+ pos = qd2offset(qd);
+ error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
+ if (error < 0)
+ return error;
+
+ qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
+ qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
+ qlvb->__pad = 0;
+ qlvb->qb_limit = q.qu_limit;
+ qlvb->qb_warn = q.qu_warn;
+ qlvb->qb_value = q.qu_value;
+ qd->qd_qb = *qlvb;
+
+ return 0;
+}
+
+static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
+ struct gfs2_holder *q_gh)
+{
+ struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+ struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
+ struct gfs2_holder i_gh;
+ int error;
+
+restart:
+ error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
+ if (error)
+ return error;
+
+ if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
+ force_refresh = FORCE;
+
+ qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
+
+ if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
+ gfs2_glock_dq_uninit(q_gh);
+ error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
+ GL_NOCACHE, q_gh);
+ if (error)
+ return error;
+
+ error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
+ if (error)
+ goto fail;
+
+ error = update_qd(sdp, qd);
+ if (error)
+ goto fail_gunlock;
+
+ gfs2_glock_dq_uninit(&i_gh);
+ gfs2_glock_dq_uninit(q_gh);
+ force_refresh = 0;
+ goto restart;
+ }
+
+ return 0;
+
+fail_gunlock:
+ gfs2_glock_dq_uninit(&i_gh);
+fail:
+ gfs2_glock_dq_uninit(q_gh);
+ return error;
+}
+
+int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+ struct gfs2_quota_data *qd;
+ unsigned int x;
+ int error = 0;
+
+ error = gfs2_quota_hold(ip, uid, gid);
+ if (error)
+ return error;
+
+ if (capable(CAP_SYS_RESOURCE) ||
+ sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
+ return 0;
+
+ sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
+ sizeof(struct gfs2_quota_data *), sort_qd, NULL);
+
+ for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
+ qd = ip->i_res->rs_qa_qd[x];
+ error = do_glock(qd, NO_FORCE, &ip->i_res->rs_qa_qd_ghs[x]);
+ if (error)
+ break;
+ }
+
+ if (!error)
+ set_bit(GIF_QD_LOCKED, &ip->i_flags);
+ else {
+ while (x--)
+ gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
+ gfs2_quota_unhold(ip);
+ }
+
+ return error;
+}
+
+static int need_sync(struct gfs2_quota_data *qd)
+{
+ struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+ struct gfs2_tune *gt = &sdp->sd_tune;
+ s64 value;
+ unsigned int num, den;
+ int do_sync = 1;
+
+ if (!qd->qd_qb.qb_limit)
+ return 0;
+
+ spin_lock(&qd_lock);
+ value = qd->qd_change;
+ spin_unlock(&qd_lock);
+
+ spin_lock(>->gt_spin);
+ num = gt->gt_quota_scale_num;
+ den = gt->gt_quota_scale_den;
+ spin_unlock(>->gt_spin);
+
+ if (value < 0)
+ do_sync = 0;
+ else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
+ (s64)be64_to_cpu(qd->qd_qb.qb_limit))
+ do_sync = 0;
+ else {
+ value *= gfs2_jindex_size(sdp) * num;
+ value = div_s64(value, den);
+ value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
+ if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
+ do_sync = 0;
+ }
+
+ return do_sync;
+}
+
+void gfs2_quota_unlock(struct gfs2_inode *ip)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+ struct gfs2_quota_data *qda[4];
+ unsigned int count = 0;
+ unsigned int x;
+ int found;
+
+ if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
+ goto out;
+
+ for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
+ struct gfs2_quota_data *qd;
+ int sync;
+
+ qd = ip->i_res->rs_qa_qd[x];
+ sync = need_sync(qd);
+
+ gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
+ if (!sync)
+ continue;
+
+ spin_lock(&qd_lock);
+ found = qd_check_sync(sdp, qd, NULL);
+ spin_unlock(&qd_lock);
+
+ if (!found)
+ continue;
+
+ gfs2_assert_warn(sdp, qd->qd_change_sync);
+ if (bh_get(qd)) {
+ clear_bit(QDF_LOCKED, &qd->qd_flags);
+ slot_put(qd);
+ qd_put(qd);
+ continue;
+ }
+
+ qda[count++] = qd;
+ }
+
+ if (count) {
+ do_sync(count, qda);
+ for (x = 0; x < count; x++)
+ qd_unlock(qda[x]);
+ }
+
+out:
+ gfs2_quota_unhold(ip);
+}
+
+#define MAX_LINE 256
+
+static int print_message(struct gfs2_quota_data *qd, char *type)
+{
+ struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+
+ fs_info(sdp, "quota %s for %s %u\n",
+ type,
+ (qd->qd_id.type == USRQUOTA) ? "user" : "group",
+ from_kqid(&init_user_ns, qd->qd_id));
+
+ return 0;
+}
+
+/**
+ * gfs2_quota_check - check if allocating new blocks will exceed quota
+ * @ip: The inode for which this check is being performed
+ * @uid: The uid to check against
+ * @gid: The gid to check against
+ * @ap: The allocation parameters. ap->target contains the requested
+ * blocks. ap->min_target, if set, contains the minimum blks
+ * requested.
+ *
+ * Returns: 0 on success.
+ * min_req = ap->min_target ? ap->min_target : ap->target;
+ * quota must allow atleast min_req blks for success and
+ * ap->allowed is set to the number of blocks allowed
+ *
+ * -EDQUOT otherwise, quota violation. ap->allowed is set to number
+ * of blocks available.
+ */
+int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
+ struct gfs2_alloc_parms *ap)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+ struct gfs2_quota_data *qd;
+ s64 value, warn, limit;
+ unsigned int x;
+ int error = 0;
+
+ ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
+ if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
+ return 0;
+
+ if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
+ return 0;
+
+ for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
+ qd = ip->i_res->rs_qa_qd[x];
+
+ if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
+ qid_eq(qd->qd_id, make_kqid_gid(gid))))
+ continue;
+
+ warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
+ limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
+ value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
+ spin_lock(&qd_lock);
+ value += qd->qd_change;
+ spin_unlock(&qd_lock);
+
+ if (limit > 0 && (limit - value) < ap->allowed)
+ ap->allowed = limit - value;
+ /* If we can't meet the target */
+ if (limit && limit < (value + (s64)ap->target)) {
+ /* If no min_target specified or we don't meet
+ * min_target, return -EDQUOT */
+ if (!ap->min_target || ap->min_target > ap->allowed) {
+ print_message(qd, "exceeded");
+ quota_send_warning(qd->qd_id,
+ sdp->sd_vfs->s_dev,
+ QUOTA_NL_BHARDWARN);
+ error = -EDQUOT;
+ break;
+ }
+ } else if (warn && warn < value &&
+ time_after_eq(jiffies, qd->qd_last_warn +
+ gfs2_tune_get(sdp, gt_quota_warn_period)
+ * HZ)) {
+ quota_send_warning(qd->qd_id,
+ sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
+ error = print_message(qd, "warning");
+ qd->qd_last_warn = jiffies;
+ }
+ }
+ return error;
+}
+
+void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
+ kuid_t uid, kgid_t gid)
+{
+ struct gfs2_quota_data *qd;
+ unsigned int x;
+
+ if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
+ return;
+ if (ip->i_diskflags & GFS2_DIF_SYSTEM)
+ return;
+
+ for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
+ qd = ip->i_res->rs_qa_qd[x];
+
+ if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
+ qid_eq(qd->qd_id, make_kqid_gid(gid))) {
+ do_qc(qd, change);
+ }
+ }
+}
+
+int gfs2_quota_sync(struct super_block *sb, int type)
+{
+ struct gfs2_sbd *sdp = sb->s_fs_info;
+ struct gfs2_quota_data **qda;
+ unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
+ unsigned int num_qd;
+ unsigned int x;
+ int error = 0;
+
+ qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
+ if (!qda)
+ return -ENOMEM;
+
+ mutex_lock(&sdp->sd_quota_sync_mutex);
+ sdp->sd_quota_sync_gen++;
+
+ do {
+ num_qd = 0;
+
+ for (;;) {
+ error = qd_fish(sdp, qda + num_qd);
+ if (error || !qda[num_qd])
+ break;
+ if (++num_qd == max_qd)
+ break;
+ }
+
+ if (num_qd) {
+ if (!error)
+ error = do_sync(num_qd, qda);
+ if (!error)
+ for (x = 0; x < num_qd; x++)
+ qda[x]->qd_sync_gen =
+ sdp->sd_quota_sync_gen;
+
+ for (x = 0; x < num_qd; x++)
+ qd_unlock(qda[x]);
+ }
+ } while (!error && num_qd == max_qd);
+
+ mutex_unlock(&sdp->sd_quota_sync_mutex);
+ kfree(qda);
+
+ return error;
+}
+
+int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
+{
+ struct gfs2_quota_data *qd;
+ struct gfs2_holder q_gh;
+ int error;
+
+ error = qd_get(sdp, qid, &qd);
+ if (error)
+ return error;
+
+ error = do_glock(qd, FORCE, &q_gh);
+ if (!error)
+ gfs2_glock_dq_uninit(&q_gh);
+
+ qd_put(qd);
+ return error;
+}
+
+int gfs2_quota_init(struct gfs2_sbd *sdp)
+{
+ struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
+ u64 size = i_size_read(sdp->sd_qc_inode);
+ unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
+ unsigned int x, slot = 0;
+ unsigned int found = 0;
+ unsigned int hash;
+ unsigned int bm_size;
+ u64 dblock;
+ u32 extlen = 0;
+ int error;
+
+ if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
+ return -EIO;
+
+ sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
+ bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
+ bm_size *= sizeof(unsigned long);
+ error = -ENOMEM;
+ sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
+ if (sdp->sd_quota_bitmap == NULL)
+ sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
+ __GFP_ZERO, PAGE_KERNEL);
+ if (!sdp->sd_quota_bitmap)
+ return error;
+
+ for (x = 0; x < blocks; x++) {
+ struct buffer_head *bh;
+ const struct gfs2_quota_change *qc;
+ unsigned int y;
+
+ if (!extlen) {
+ int new = 0;
+ error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
+ if (error)
+ goto fail;
+ }
+ error = -EIO;
+ bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
+ if (!bh)
+ goto fail;
+ if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
+ brelse(bh);
+ goto fail;
+ }
+
+ qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
+ for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
+ y++, slot++) {
+ struct gfs2_quota_data *qd;
+ s64 qc_change = be64_to_cpu(qc->qc_change);
+ u32 qc_flags = be32_to_cpu(qc->qc_flags);
+ enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
+ USRQUOTA : GRPQUOTA;
+ struct kqid qc_id = make_kqid(&init_user_ns, qtype,
+ be32_to_cpu(qc->qc_id));
+ qc++;
+ if (!qc_change)
+ continue;
+
+ hash = gfs2_qd_hash(sdp, qc_id);
+ qd = qd_alloc(hash, sdp, qc_id);
+ if (qd == NULL) {
+ brelse(bh);
+ goto fail;
+ }
+
+ set_bit(QDF_CHANGE, &qd->qd_flags);
+ qd->qd_change = qc_change;
+ qd->qd_slot = slot;
+ qd->qd_slot_count = 1;
+
+ spin_lock(&qd_lock);
+ BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
+ list_add(&qd->qd_list, &sdp->sd_quota_list);
+ atomic_inc(&sdp->sd_quota_count);
+ spin_unlock(&qd_lock);
+
+ spin_lock_bucket(hash);
+ hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
+ spin_unlock_bucket(hash);
+
+ found++;
+ }
+
+ brelse(bh);
+ dblock++;
+ extlen--;
+ }
+
+ if (found)
+ fs_info(sdp, "found %u quota changes\n", found);
+
+ return 0;
+
+fail:
+ gfs2_quota_cleanup(sdp);
+ return error;
+}
+
+void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
+{
+ struct list_head *head = &sdp->sd_quota_list;
+ struct gfs2_quota_data *qd;
+
+ spin_lock(&qd_lock);
+ while (!list_empty(head)) {
+ qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
+
+ list_del(&qd->qd_list);
+
+ /* Also remove if this qd exists in the reclaim list */
+ list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
+ atomic_dec(&sdp->sd_quota_count);
+ spin_unlock(&qd_lock);
+
+ spin_lock_bucket(qd->qd_hash);
+ hlist_bl_del_rcu(&qd->qd_hlist);
+ spin_unlock_bucket(qd->qd_hash);
+
+ gfs2_assert_warn(sdp, !qd->qd_change);
+ gfs2_assert_warn(sdp, !qd->qd_slot_count);
+ gfs2_assert_warn(sdp, !qd->qd_bh_count);
+
+ gfs2_glock_put(qd->qd_gl);
+ call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
+
+ spin_lock(&qd_lock);
+ }
+ spin_unlock(&qd_lock);
+
+ gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
+
+ kvfree(sdp->sd_quota_bitmap);
+ sdp->sd_quota_bitmap = NULL;
+}
+
+static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
+{
+ if (error == 0 || error == -EROFS)
+ return;
+ if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
+ fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
+}
+
+static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
+ int (*fxn)(struct super_block *sb, int type),
+ unsigned long t, unsigned long *timeo,
+ unsigned int *new_timeo)
+{
+ if (t >= *timeo) {
+ int error = fxn(sdp->sd_vfs, 0);
+ quotad_error(sdp, msg, error);
+ *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
+ } else {
+ *timeo -= t;
+ }
+}
+
+static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
+{
+ struct gfs2_inode *ip;
+
+ while(1) {
+ ip = NULL;
+ spin_lock(&sdp->sd_trunc_lock);
+ if (!list_empty(&sdp->sd_trunc_list)) {
+ ip = list_entry(sdp->sd_trunc_list.next,
+ struct gfs2_inode, i_trunc_list);
+ list_del_init(&ip->i_trunc_list);
+ }
+ spin_unlock(&sdp->sd_trunc_lock);
+ if (ip == NULL)
+ return;
+ gfs2_glock_finish_truncate(ip);
+ }
+}
+
+void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
+ if (!sdp->sd_statfs_force_sync) {
+ sdp->sd_statfs_force_sync = 1;
+ wake_up(&sdp->sd_quota_wait);
+ }
+}
+
+
+/**
+ * gfs2_quotad - Write cached quota changes into the quota file
+ * @sdp: Pointer to GFS2 superblock
+ *
+ */
+
+int gfs2_quotad(void *data)
+{
+ struct gfs2_sbd *sdp = data;
+ struct gfs2_tune *tune = &sdp->sd_tune;
+ unsigned long statfs_timeo = 0;
+ unsigned long quotad_timeo = 0;
+ unsigned long t = 0;
+ DEFINE_WAIT(wait);
+ int empty;
+
+ while (!kthread_should_stop()) {
+
+ /* Update the master statfs file */
+ if (sdp->sd_statfs_force_sync) {
+ int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
+ quotad_error(sdp, "statfs", error);
+ statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
+ }
+ else
+ quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
+ &statfs_timeo,
+ &tune->gt_statfs_quantum);
+
+ /* Update quota file */
+ quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
+ "ad_timeo, &tune->gt_quota_quantum);
+
+ /* Check for & recover partially truncated inodes */
+ quotad_check_trunc_list(sdp);
+
+ try_to_freeze();
+
+ t = min(quotad_timeo, statfs_timeo);
+
+ prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
+ spin_lock(&sdp->sd_trunc_lock);
+ empty = list_empty(&sdp->sd_trunc_list);
+ spin_unlock(&sdp->sd_trunc_lock);
+ if (empty && !sdp->sd_statfs_force_sync)
+ t -= schedule_timeout(t);
+ else
+ t = 0;
+ finish_wait(&sdp->sd_quota_wait, &wait);
+ }
+
+ return 0;
+}
+
+static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
+{
+ struct gfs2_sbd *sdp = sb->s_fs_info;
+
+ memset(state, 0, sizeof(*state));
+
+ switch (sdp->sd_args.ar_quota) {
+ case GFS2_QUOTA_ON:
+ state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
+ state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
+ /*FALLTHRU*/
+ case GFS2_QUOTA_ACCOUNT:
+ state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
+ QCI_SYSFILE;
+ state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
+ QCI_SYSFILE;
+ break;
+ case GFS2_QUOTA_OFF:
+ break;
+ }
+ if (sdp->sd_quota_inode) {
+ state->s_state[USRQUOTA].ino =
+ GFS2_I(sdp->sd_quota_inode)->i_no_addr;
+ state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
+ }
+ state->s_state[USRQUOTA].nextents = 1; /* unsupported */
+ state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
+ state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
+ return 0;
+}
+
+static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
+ struct qc_dqblk *fdq)
+{
+ struct gfs2_sbd *sdp = sb->s_fs_info;
+ struct gfs2_quota_lvb *qlvb;
+ struct gfs2_quota_data *qd;
+ struct gfs2_holder q_gh;
+ int error;
+
+ memset(fdq, 0, sizeof(*fdq));
+
+ if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
+ return -ESRCH; /* Crazy XFS error code */
+
+ if ((qid.type != USRQUOTA) &&
+ (qid.type != GRPQUOTA))
+ return -EINVAL;
+
+ error = qd_get(sdp, qid, &qd);
+ if (error)
+ return error;
+ error = do_glock(qd, FORCE, &q_gh);
+ if (error)
+ goto out;
+
+ qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
+ fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
+ fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
+ fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
+
+ gfs2_glock_dq_uninit(&q_gh);
+out:
+ qd_put(qd);
+ return error;
+}
+
+/* GFS2 only supports a subset of the XFS fields */
+#define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
+
+static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
+ struct qc_dqblk *fdq)
+{
+ struct gfs2_sbd *sdp = sb->s_fs_info;
+ struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
+ struct gfs2_quota_data *qd;
+ struct gfs2_holder q_gh, i_gh;
+ unsigned int data_blocks, ind_blocks;
+ unsigned int blocks = 0;
+ int alloc_required;
+ loff_t offset;
+ int error;
+
+ if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
+ return -ESRCH; /* Crazy XFS error code */
+
+ if ((qid.type != USRQUOTA) &&
+ (qid.type != GRPQUOTA))
+ return -EINVAL;
+
+ if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
+ return -EINVAL;
+
+ error = qd_get(sdp, qid, &qd);
+ if (error)
+ return error;
+
+ error = gfs2_rs_alloc(ip);
+ if (error)
+ goto out_put;
+
+ mutex_lock(&ip->i_inode.i_mutex);
+ error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
+ if (error)
+ goto out_unlockput;
+ error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
+ if (error)
+ goto out_q;
+
+ /* Check for existing entry, if none then alloc new blocks */
+ error = update_qd(sdp, qd);
+ if (error)
+ goto out_i;
+
+ /* If nothing has changed, this is a no-op */
+ if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
+ ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
+ fdq->d_fieldmask ^= QC_SPC_SOFT;
+
+ if ((fdq->d_fieldmask & QC_SPC_HARD) &&
+ ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
+ fdq->d_fieldmask ^= QC_SPC_HARD;
+
+ if ((fdq->d_fieldmask & QC_SPACE) &&
+ ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
+ fdq->d_fieldmask ^= QC_SPACE;
+
+ if (fdq->d_fieldmask == 0)
+ goto out_i;
+
+ offset = qd2offset(qd);
+ alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
+ if (gfs2_is_stuffed(ip))
+ alloc_required = 1;
+ if (alloc_required) {
+ struct gfs2_alloc_parms ap = { .aflags = 0, };
+ gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
+ &data_blocks, &ind_blocks);
+ blocks = 1 + data_blocks + ind_blocks;
+ ap.target = blocks;
+ error = gfs2_inplace_reserve(ip, &ap);
+ if (error)
+ goto out_i;
+ blocks += gfs2_rg_blocks(ip, blocks);
+ }
+
+ /* Some quotas span block boundaries and can update two blocks,
+ adding an extra block to the transaction to handle such quotas */
+ error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
+ if (error)
+ goto out_release;
+
+ /* Apply changes */
+ error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
+
+ gfs2_trans_end(sdp);
+out_release:
+ if (alloc_required)
+ gfs2_inplace_release(ip);
+out_i:
+ gfs2_glock_dq_uninit(&i_gh);
+out_q:
+ gfs2_glock_dq_uninit(&q_gh);
+out_unlockput:
+ mutex_unlock(&ip->i_inode.i_mutex);
+out_put:
+ qd_put(qd);
+ return error;
+}
+
+const struct quotactl_ops gfs2_quotactl_ops = {
+ .quota_sync = gfs2_quota_sync,
+ .get_state = gfs2_quota_get_state,
+ .get_dqblk = gfs2_get_dqblk,
+ .set_dqblk = gfs2_set_dqblk,
+};
+
+void __init gfs2_quota_hash_init(void)
+{
+ unsigned i;
+
+ for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
+ INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
+}
Code Review / kvmfornfv.git / blobdiff