1766 lines
42 KiB
C
1766 lines
42 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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/*
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* Quota change tags are associated with each transaction that allocates or
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* deallocates space. Those changes are accumulated locally to each node (in a
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* per-node file) and then are periodically synced to the quota file. This
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* avoids the bottleneck of constantly touching the quota file, but introduces
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* fuzziness in the current usage value of IDs that are being used on different
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* nodes in the cluster simultaneously. So, it is possible for a user on
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* multiple nodes to overrun their quota, but that overrun is controlable.
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* Since quota tags are part of transactions, there is no need for a quota check
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* program to be run on node crashes or anything like that.
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*
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* There are couple of knobs that let the administrator manage the quota
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* fuzziness. "quota_quantum" sets the maximum time a quota change can be
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* sitting on one node before being synced to the quota file. (The default is
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* 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency
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* of quota file syncs increases as the user moves closer to their limit. The
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* more frequent the syncs, the more accurate the quota enforcement, but that
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* means that there is more contention between the nodes for the quota file.
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* The default value is one. This sets the maximum theoretical quota overrun
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* (with infinite node with infinite bandwidth) to twice the user's limit. (In
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* practice, the maximum overrun you see should be much less.) A "quota_scale"
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* number greater than one makes quota syncs more frequent and reduces the
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* maximum overrun. Numbers less than one (but greater than zero) make quota
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* syncs less frequent.
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*
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* GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
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* the quota file, so it is not being constantly read.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/sort.h>
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#include <linux/fs.h>
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#include <linux/bio.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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#include <linux/quota.h>
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#include <linux/dqblk_xfs.h>
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#include <linux/lockref.h>
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#include <linux/list_lru.h>
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#include <linux/rcupdate.h>
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#include <linux/rculist_bl.h>
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#include <linux/bit_spinlock.h>
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#include <linux/jhash.h>
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#include <linux/vmalloc.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "bmap.h"
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#include "glock.h"
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#include "glops.h"
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#include "log.h"
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#include "meta_io.h"
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#include "quota.h"
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#include "rgrp.h"
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#include "super.h"
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#include "trans.h"
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#include "inode.h"
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#include "util.h"
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#define GFS2_QD_HASH_SHIFT 12
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#define GFS2_QD_HASH_SIZE BIT(GFS2_QD_HASH_SHIFT)
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#define GFS2_QD_HASH_MASK (GFS2_QD_HASH_SIZE - 1)
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/* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
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/* -> sd_bitmap_lock */
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static DEFINE_SPINLOCK(qd_lock);
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struct list_lru gfs2_qd_lru;
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static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
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static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
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const struct kqid qid)
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{
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unsigned int h;
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h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
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h = jhash(&qid, sizeof(struct kqid), h);
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return h & GFS2_QD_HASH_MASK;
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}
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static inline void spin_lock_bucket(unsigned int hash)
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{
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hlist_bl_lock(&qd_hash_table[hash]);
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}
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static inline void spin_unlock_bucket(unsigned int hash)
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{
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hlist_bl_unlock(&qd_hash_table[hash]);
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}
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static void gfs2_qd_dealloc(struct rcu_head *rcu)
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{
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struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
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kmem_cache_free(gfs2_quotad_cachep, qd);
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}
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static void gfs2_qd_dispose(struct list_head *list)
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{
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struct gfs2_quota_data *qd;
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struct gfs2_sbd *sdp;
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while (!list_empty(list)) {
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qd = list_entry(list->next, struct gfs2_quota_data, qd_lru);
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sdp = qd->qd_gl->gl_name.ln_sbd;
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list_del(&qd->qd_lru);
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/* Free from the filesystem-specific list */
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spin_lock(&qd_lock);
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list_del(&qd->qd_list);
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spin_unlock(&qd_lock);
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spin_lock_bucket(qd->qd_hash);
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hlist_bl_del_rcu(&qd->qd_hlist);
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spin_unlock_bucket(qd->qd_hash);
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gfs2_assert_warn(sdp, !qd->qd_change);
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gfs2_assert_warn(sdp, !qd->qd_slot_count);
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gfs2_assert_warn(sdp, !qd->qd_bh_count);
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gfs2_glock_put(qd->qd_gl);
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atomic_dec(&sdp->sd_quota_count);
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/* Delete it from the common reclaim list */
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call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
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}
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}
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static enum lru_status gfs2_qd_isolate(struct list_head *item,
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struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
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{
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struct list_head *dispose = arg;
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struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
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if (!spin_trylock(&qd->qd_lockref.lock))
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return LRU_SKIP;
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if (qd->qd_lockref.count == 0) {
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lockref_mark_dead(&qd->qd_lockref);
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list_lru_isolate_move(lru, &qd->qd_lru, dispose);
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}
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spin_unlock(&qd->qd_lockref.lock);
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return LRU_REMOVED;
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}
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static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
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struct shrink_control *sc)
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{
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LIST_HEAD(dispose);
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unsigned long freed;
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if (!(sc->gfp_mask & __GFP_FS))
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return SHRINK_STOP;
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freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
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gfs2_qd_isolate, &dispose);
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gfs2_qd_dispose(&dispose);
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return freed;
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}
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static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
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struct shrink_control *sc)
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{
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return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
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}
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struct shrinker gfs2_qd_shrinker = {
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.count_objects = gfs2_qd_shrink_count,
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.scan_objects = gfs2_qd_shrink_scan,
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.seeks = DEFAULT_SEEKS,
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.flags = SHRINKER_NUMA_AWARE,
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};
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static u64 qd2index(struct gfs2_quota_data *qd)
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{
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struct kqid qid = qd->qd_id;
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return (2 * (u64)from_kqid(&init_user_ns, qid)) +
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((qid.type == USRQUOTA) ? 0 : 1);
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}
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static u64 qd2offset(struct gfs2_quota_data *qd)
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{
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u64 offset;
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offset = qd2index(qd);
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offset *= sizeof(struct gfs2_quota);
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return offset;
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}
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static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
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{
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struct gfs2_quota_data *qd;
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int error;
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qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
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if (!qd)
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return NULL;
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qd->qd_sbd = sdp;
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qd->qd_lockref.count = 1;
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spin_lock_init(&qd->qd_lockref.lock);
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qd->qd_id = qid;
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qd->qd_slot = -1;
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INIT_LIST_HEAD(&qd->qd_lru);
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qd->qd_hash = hash;
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error = gfs2_glock_get(sdp, qd2index(qd),
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&gfs2_quota_glops, CREATE, &qd->qd_gl);
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if (error)
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goto fail;
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return qd;
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fail:
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kmem_cache_free(gfs2_quotad_cachep, qd);
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return NULL;
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}
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static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
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const struct gfs2_sbd *sdp,
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struct kqid qid)
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{
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struct gfs2_quota_data *qd;
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struct hlist_bl_node *h;
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hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
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if (!qid_eq(qd->qd_id, qid))
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continue;
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if (qd->qd_sbd != sdp)
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continue;
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if (lockref_get_not_dead(&qd->qd_lockref)) {
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list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
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return qd;
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}
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}
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return NULL;
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}
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static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
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struct gfs2_quota_data **qdp)
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{
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struct gfs2_quota_data *qd, *new_qd;
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unsigned int hash = gfs2_qd_hash(sdp, qid);
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rcu_read_lock();
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*qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
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rcu_read_unlock();
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if (qd)
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return 0;
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new_qd = qd_alloc(hash, sdp, qid);
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if (!new_qd)
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return -ENOMEM;
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spin_lock(&qd_lock);
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spin_lock_bucket(hash);
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*qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
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if (qd == NULL) {
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*qdp = new_qd;
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list_add(&new_qd->qd_list, &sdp->sd_quota_list);
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hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
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atomic_inc(&sdp->sd_quota_count);
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}
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spin_unlock_bucket(hash);
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spin_unlock(&qd_lock);
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if (qd) {
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gfs2_glock_put(new_qd->qd_gl);
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kmem_cache_free(gfs2_quotad_cachep, new_qd);
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}
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return 0;
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}
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static void qd_hold(struct gfs2_quota_data *qd)
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{
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struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
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gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
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lockref_get(&qd->qd_lockref);
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}
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static void qd_put(struct gfs2_quota_data *qd)
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{
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if (lockref_put_or_lock(&qd->qd_lockref))
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return;
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qd->qd_lockref.count = 0;
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list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
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spin_unlock(&qd->qd_lockref.lock);
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}
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static int slot_get(struct gfs2_quota_data *qd)
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{
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struct gfs2_sbd *sdp = qd->qd_sbd;
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unsigned int bit;
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int error = 0;
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spin_lock(&sdp->sd_bitmap_lock);
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if (qd->qd_slot_count != 0)
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goto out;
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error = -ENOSPC;
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bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
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if (bit < sdp->sd_quota_slots) {
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set_bit(bit, sdp->sd_quota_bitmap);
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qd->qd_slot = bit;
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error = 0;
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out:
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qd->qd_slot_count++;
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}
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spin_unlock(&sdp->sd_bitmap_lock);
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return error;
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}
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static void slot_hold(struct gfs2_quota_data *qd)
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{
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struct gfs2_sbd *sdp = qd->qd_sbd;
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spin_lock(&sdp->sd_bitmap_lock);
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gfs2_assert(sdp, qd->qd_slot_count);
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qd->qd_slot_count++;
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spin_unlock(&sdp->sd_bitmap_lock);
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}
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static void slot_put(struct gfs2_quota_data *qd)
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{
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struct gfs2_sbd *sdp = qd->qd_sbd;
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spin_lock(&sdp->sd_bitmap_lock);
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gfs2_assert(sdp, qd->qd_slot_count);
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if (!--qd->qd_slot_count) {
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BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
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qd->qd_slot = -1;
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}
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spin_unlock(&sdp->sd_bitmap_lock);
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}
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static int bh_get(struct gfs2_quota_data *qd)
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{
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struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
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struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
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unsigned int block, offset;
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struct buffer_head *bh;
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int error;
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struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
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mutex_lock(&sdp->sd_quota_mutex);
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if (qd->qd_bh_count++) {
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mutex_unlock(&sdp->sd_quota_mutex);
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return 0;
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}
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block = qd->qd_slot / sdp->sd_qc_per_block;
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offset = qd->qd_slot % sdp->sd_qc_per_block;
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bh_map.b_size = BIT(ip->i_inode.i_blkbits);
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error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
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if (error)
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goto fail;
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error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, 0, &bh);
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if (error)
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goto fail;
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error = -EIO;
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if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
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goto fail_brelse;
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qd->qd_bh = bh;
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qd->qd_bh_qc = (struct gfs2_quota_change *)
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(bh->b_data + sizeof(struct gfs2_meta_header) +
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offset * sizeof(struct gfs2_quota_change));
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|
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mutex_unlock(&sdp->sd_quota_mutex);
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|
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return 0;
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|
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fail_brelse:
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brelse(bh);
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fail:
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qd->qd_bh_count--;
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mutex_unlock(&sdp->sd_quota_mutex);
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return error;
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}
|
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|
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static void bh_put(struct gfs2_quota_data *qd)
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{
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struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
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|
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mutex_lock(&sdp->sd_quota_mutex);
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gfs2_assert(sdp, qd->qd_bh_count);
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if (!--qd->qd_bh_count) {
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brelse(qd->qd_bh);
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qd->qd_bh = NULL;
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qd->qd_bh_qc = NULL;
|
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}
|
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mutex_unlock(&sdp->sd_quota_mutex);
|
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}
|
|
|
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static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
|
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u64 *sync_gen)
|
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{
|
|
if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
|
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!test_bit(QDF_CHANGE, &qd->qd_flags) ||
|
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(sync_gen && (qd->qd_sync_gen >= *sync_gen)))
|
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return 0;
|
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|
|
if (!lockref_get_not_dead(&qd->qd_lockref))
|
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return 0;
|
|
|
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list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
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set_bit(QDF_LOCKED, &qd->qd_flags);
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qd->qd_change_sync = qd->qd_change;
|
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slot_hold(qd);
|
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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 (sb_rdonly(sdp->sd_vfs))
|
|
return 0;
|
|
|
|
spin_lock(&qd_lock);
|
|
|
|
list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
|
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found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
|
|
if (found)
|
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break;
|
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}
|
|
|
|
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_name.ln_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);
|
|
}
|
|
|
|
/**
|
|
* gfs2_qa_alloc - make sure we have a quota allocations data structure,
|
|
* if necessary
|
|
* @ip: the inode for this reservation
|
|
*/
|
|
int gfs2_qa_alloc(struct gfs2_inode *ip)
|
|
{
|
|
int error = 0;
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
|
|
if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
|
|
return 0;
|
|
|
|
down_write(&ip->i_rw_mutex);
|
|
if (ip->i_qadata == NULL) {
|
|
ip->i_qadata = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
|
|
if (!ip->i_qadata)
|
|
error = -ENOMEM;
|
|
}
|
|
up_write(&ip->i_rw_mutex);
|
|
return error;
|
|
}
|
|
|
|
void gfs2_qa_delete(struct gfs2_inode *ip, atomic_t *wcount)
|
|
{
|
|
down_write(&ip->i_rw_mutex);
|
|
if (ip->i_qadata && ((wcount == NULL) || (atomic_read(wcount) <= 1))) {
|
|
kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
|
|
ip->i_qadata = NULL;
|
|
}
|
|
up_write(&ip->i_rw_mutex);
|
|
}
|
|
|
|
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 (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
|
|
return 0;
|
|
|
|
if (ip->i_qadata == NULL) {
|
|
error = gfs2_rsqa_alloc(ip);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
qd = ip->i_qadata->qa_qd;
|
|
|
|
if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
|
|
gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
|
|
return -EIO;
|
|
|
|
error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
|
|
if (error)
|
|
goto out;
|
|
ip->i_qadata->qa_qd_num++;
|
|
qd++;
|
|
|
|
error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
|
|
if (error)
|
|
goto out;
|
|
ip->i_qadata->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_qadata->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_qadata->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);
|
|
u32 x;
|
|
|
|
if (ip->i_qadata == NULL)
|
|
return;
|
|
gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
|
|
|
|
for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
|
|
qdsb_put(ip->i_qadata->qa_qd[x]);
|
|
ip->i_qadata->qa_qd[x] = NULL;
|
|
}
|
|
ip->i_qadata->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_name.ln_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);
|
|
}
|
|
|
|
if (change < 0) /* Reset quiet flag if we freed some blocks */
|
|
clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
|
|
mutex_unlock(&sdp->sd_quota_mutex);
|
|
}
|
|
|
|
static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
|
|
unsigned off, void *buf, unsigned bytes)
|
|
{
|
|
struct inode *inode = &ip->i_inode;
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
struct address_space *mapping = inode->i_mapping;
|
|
struct page *page;
|
|
struct buffer_head *bh;
|
|
void *kaddr;
|
|
u64 blk;
|
|
unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
|
|
unsigned to_write = bytes, pg_off = off;
|
|
int done = 0;
|
|
|
|
blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
|
|
boff = off % bsize;
|
|
|
|
page = find_or_create_page(mapping, index, GFP_NOFS);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
if (!page_has_buffers(page))
|
|
create_empty_buffers(page, bsize, 0);
|
|
|
|
bh = page_buffers(page);
|
|
while (!done) {
|
|
/* Find the beginning block within the page */
|
|
if (pg_off >= ((bnum * bsize) + bsize)) {
|
|
bh = bh->b_this_page;
|
|
bnum++;
|
|
blk++;
|
|
continue;
|
|
}
|
|
if (!buffer_mapped(bh)) {
|
|
gfs2_block_map(inode, blk, bh, 1);
|
|
if (!buffer_mapped(bh))
|
|
goto unlock_out;
|
|
/* If it's a newly allocated disk block, zero it */
|
|
if (buffer_new(bh))
|
|
zero_user(page, bnum * bsize, bh->b_size);
|
|
}
|
|
if (PageUptodate(page))
|
|
set_buffer_uptodate(bh);
|
|
if (!buffer_uptodate(bh)) {
|
|
ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &bh);
|
|
wait_on_buffer(bh);
|
|
if (!buffer_uptodate(bh))
|
|
goto unlock_out;
|
|
}
|
|
gfs2_trans_add_data(ip->i_gl, bh);
|
|
|
|
/* If we need to write to the next block as well */
|
|
if (to_write > (bsize - boff)) {
|
|
pg_off += (bsize - boff);
|
|
to_write -= (bsize - boff);
|
|
boff = pg_off % bsize;
|
|
continue;
|
|
}
|
|
done = 1;
|
|
}
|
|
|
|
/* Write to the page, now that we have setup the buffer(s) */
|
|
kaddr = kmap_atomic(page);
|
|
memcpy(kaddr + off, buf, bytes);
|
|
flush_dcache_page(page);
|
|
kunmap_atomic(kaddr);
|
|
unlock_page(page);
|
|
put_page(page);
|
|
|
|
return 0;
|
|
|
|
unlock_out:
|
|
unlock_page(page);
|
|
put_page(page);
|
|
return -EIO;
|
|
}
|
|
|
|
static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp,
|
|
loff_t loc)
|
|
{
|
|
unsigned long pg_beg;
|
|
unsigned pg_off, nbytes, overflow = 0;
|
|
int pg_oflow = 0, error;
|
|
void *ptr;
|
|
|
|
nbytes = sizeof(struct gfs2_quota);
|
|
|
|
pg_beg = loc >> PAGE_SHIFT;
|
|
pg_off = loc % PAGE_SIZE;
|
|
|
|
/* If the quota straddles a page boundary, split the write in two */
|
|
if ((pg_off + nbytes) > PAGE_SIZE) {
|
|
pg_oflow = 1;
|
|
overflow = (pg_off + nbytes) - PAGE_SIZE;
|
|
}
|
|
|
|
ptr = qp;
|
|
error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr,
|
|
nbytes - overflow);
|
|
/* If there's an overflow, write the remaining bytes to the next page */
|
|
if (!error && pg_oflow)
|
|
error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0,
|
|
ptr + nbytes - overflow,
|
|
overflow);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* 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 gfs2_quota q;
|
|
int err;
|
|
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;
|
|
|
|
loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
|
|
err = -EIO;
|
|
be64_add_cpu(&q.qu_value, change);
|
|
if (((s64)be64_to_cpu(q.qu_value)) < 0)
|
|
q.qu_value = 0; /* Never go negative on quota usage */
|
|
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;
|
|
}
|
|
}
|
|
|
|
err = gfs2_write_disk_quota(ip, &q, loc);
|
|
if (!err) {
|
|
size = loc + sizeof(struct gfs2_quota);
|
|
if (size > inode->i_size)
|
|
i_size_write(inode, size);
|
|
inode->i_mtime = inode->i_atime = current_time(inode);
|
|
mark_inode_dirty(inode);
|
|
set_bit(QDF_REFRESH, &qd->qd_flags);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
|
|
{
|
|
struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_name.ln_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_rsqa_alloc(ip);
|
|
if (error)
|
|
return error;
|
|
|
|
gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
|
|
&data_blocks, &ind_blocks);
|
|
|
|
ghs = kmalloc(num_qd * sizeof(struct gfs2_holder), GFP_NOFS);
|
|
if (!ghs)
|
|
return -ENOMEM;
|
|
|
|
sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
|
|
inode_lock(&ip->i_inode);
|
|
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]);
|
|
inode_unlock(&ip->i_inode);
|
|
kfree(ghs);
|
|
gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
|
|
GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
|
|
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_name.ln_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;
|
|
u32 x;
|
|
int error = 0;
|
|
|
|
if (capable(CAP_SYS_RESOURCE) ||
|
|
sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
|
|
return 0;
|
|
|
|
error = gfs2_quota_hold(ip, uid, gid);
|
|
if (error)
|
|
return error;
|
|
|
|
sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
|
|
sizeof(struct gfs2_quota_data *), sort_qd, NULL);
|
|
|
|
for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
|
|
qd = ip->i_qadata->qa_qd[x];
|
|
error = do_glock(qd, NO_FORCE, &ip->i_qadata->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_qadata->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_name.ln_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;
|
|
u32 x;
|
|
int found;
|
|
|
|
if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
|
|
goto out;
|
|
|
|
for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
|
|
struct gfs2_quota_data *qd;
|
|
int sync;
|
|
|
|
qd = ip->i_qadata->qa_qd[x];
|
|
sync = need_sync(qd);
|
|
|
|
gfs2_glock_dq_uninit(&ip->i_qadata->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_name.ln_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;
|
|
u32 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_qadata->qa_qd_num; x++) {
|
|
qd = ip->i_qadata->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) {
|
|
if (!test_and_set_bit(QDF_QMSG_QUIET,
|
|
&qd->qd_flags)) {
|
|
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;
|
|
u32 x;
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
|
|
if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON ||
|
|
gfs2_assert_warn(sdp, change))
|
|
return;
|
|
if (ip->i_diskflags & GFS2_DIF_SYSTEM)
|
|
return;
|
|
|
|
for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
|
|
qd = ip->i_qadata->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);
|
|
sdp->sd_log_error = error;
|
|
wake_up(&sdp->sd_logd_waitq);
|
|
}
|
|
}
|
|
|
|
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_rsqa_alloc(ip);
|
|
if (error)
|
|
goto out_put;
|
|
|
|
inode_lock(&ip->i_inode);
|
|
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);
|
|
if (!error)
|
|
clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
|
|
|
|
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:
|
|
inode_unlock(&ip->i_inode);
|
|
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]);
|
|
}
|