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quota.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
*/
/*
* 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 BIT(GFS2_QD_HASH_SHIFT)
#define GFS2_QD_HASH_MASK (GFS2_QD_HASH_SIZE - 1)
#define QC_CHANGE 0
#define QC_SYNC 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);
struct gfs2_sbd *sdp = qd->qd_sbd;
kmem_cache_free(gfs2_quotad_cachep, qd);
if (atomic_dec_and_test(&sdp->sd_quota_count))
wake_up(&sdp->sd_kill_wait);
}
static void gfs2_qd_dispose(struct gfs2_quota_data *qd)
{
struct gfs2_sbd *sdp = qd->qd_sbd;
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);
if (!gfs2_withdrawn(sdp)) {
gfs2_assert_warn(sdp, !qd->qd_change);
gfs2_assert_warn(sdp, !qd->qd_slot_ref);
gfs2_assert_warn(sdp, !qd->qd_bh_count);
}
gfs2_glock_put(qd->qd_gl);
call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
}
static void gfs2_qd_list_dispose(struct list_head *list)
{
struct gfs2_quota_data *qd;
while (!list_empty(list)) {
qd = list_first_entry(list, struct gfs2_quota_data, qd_lru);
list_del(&qd->qd_lru);
gfs2_qd_dispose(qd);
}
}
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);
enum lru_status status;
if (!spin_trylock(&qd->qd_lockref.lock))
return LRU_SKIP;
status = LRU_SKIP;
if (qd->qd_lockref.count == 0) {
lockref_mark_dead(&qd->qd_lockref);
list_lru_isolate_move(lru, &qd->qd_lru, dispose);
status = LRU_REMOVED;
}
spin_unlock(&qd->qd_lockref.lock);
return status;
}
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_list_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)
{
return qd2index(qd) * sizeof(struct gfs2_quota);
}
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 = 0;
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) {
new_qd->qd_lockref.count++;
*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_sbd;
gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
lockref_get(&qd->qd_lockref);
}
static void qd_put(struct gfs2_quota_data *qd)
{
struct gfs2_sbd *sdp;
if (lockref_put_or_lock(&qd->qd_lockref))
return;
BUG_ON(__lockref_is_dead(&qd->qd_lockref));
sdp = qd->qd_sbd;
if (unlikely(!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))) {
lockref_mark_dead(&qd->qd_lockref);
spin_unlock(&qd->qd_lockref.lock);
gfs2_qd_dispose(qd);
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_ref == 0) {
bit = find_first_zero_bit(sdp->sd_quota_bitmap,
sdp->sd_quota_slots);
if (bit >= sdp->sd_quota_slots) {
error = -ENOSPC;
goto out;
}
set_bit(bit, sdp->sd_quota_bitmap);
qd->qd_slot = bit;
}
qd->qd_slot_ref++;
out:
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_ref);
qd->qd_slot_ref++;
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_ref);
if (!--qd->qd_slot_ref) {
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_sbd;
struct inode *inode = sdp->sd_qc_inode;
struct gfs2_inode *ip = GFS2_I(inode);
unsigned int block, offset;
struct buffer_head *bh;
struct iomap iomap = { };
int error;
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;
error = gfs2_iomap_get(inode,
(loff_t)block << inode->i_blkbits,
i_blocksize(inode), &iomap);
if (error)
goto fail;
error = -ENOENT;
if (iomap.type != IOMAP_MAPPED)
goto fail;
error = gfs2_meta_read(ip->i_gl, iomap.addr >> inode->i_blkbits,
DIO_WAIT, 0, &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_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_bh_get_or_undo(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
{
int error;
error = bh_get(qd);
if (!error)
return 0;
clear_bit(QDF_LOCKED, &qd->qd_flags);
slot_put(qd);
qd_put(qd);
return error;
}
static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
{
struct gfs2_quota_data *qd = NULL, *iter;
int error;
*qdp = NULL;
if (sb_rdonly(sdp->sd_vfs))
return 0;
spin_lock(&qd_lock);
list_for_each_entry(iter, &sdp->sd_quota_list, qd_list) {
if (qd_check_sync(sdp, iter, &sdp->sd_quota_sync_gen)) {
qd = iter;
break;
}
}
spin_unlock(&qd_lock);
if (qd) {
error = qd_bh_get_or_undo(sdp, qd);
if (error)
return error;
*qdp = qd;
}
return 0;
}
static void qdsb_put(struct gfs2_quota_data *qd)
{
bh_put(qd);
slot_put(qd);
qd_put(qd);
}
static void qd_unlock(struct gfs2_quota_data *qd)
{
gfs2_assert_warn(qd->qd_sbd, test_bit(QDF_LOCKED, &qd->qd_flags));
clear_bit(QDF_LOCKED, &qd->qd_flags);
qdsb_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;
}
/**
* gfs2_qa_get - make sure we have a quota allocations data structure,
* if necessary
* @ip: the inode for this reservation
*/
int gfs2_qa_get(struct gfs2_inode *ip)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct inode *inode = &ip->i_inode;
if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
return 0;
spin_lock(&inode->i_lock);
if (ip->i_qadata == NULL) {
struct gfs2_qadata *tmp;
spin_unlock(&inode->i_lock);
tmp = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
if (!tmp)
return -ENOMEM;
spin_lock(&inode->i_lock);
if (ip->i_qadata == NULL)
ip->i_qadata = tmp;
else
kmem_cache_free(gfs2_qadata_cachep, tmp);
}
ip->i_qadata->qa_ref++;
spin_unlock(&inode->i_lock);
return 0;
}
void gfs2_qa_put(struct gfs2_inode *ip)
{
struct inode *inode = &ip->i_inode;
spin_lock(&inode->i_lock);
if (ip->i_qadata && --ip->i_qadata->qa_ref == 0) {
kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
ip->i_qadata = NULL;
}
spin_unlock(&inode->i_lock);
}
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;
error = gfs2_qa_get(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))) {
error = -EIO;
gfs2_qa_put(ip);
goto out;
}
error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
if (error)
goto out_unhold;
ip->i_qadata->qa_qd_num++;
qd++;
error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
if (error)
goto out_unhold;
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_unhold;
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_unhold;
ip->i_qadata->qa_qd_num++;
qd++;
}
out_unhold:
if (error)
gfs2_quota_unhold(ip);
out:
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;
gfs2_qa_put(ip);
}
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, int qc_type)
{
struct gfs2_sbd *sdp = qd->qd_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 (qc_type == QC_CHANGE) {
if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
qd_hold(qd);
slot_hold(qd);
}
} else {
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);
}
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_sbd *sdp, unsigned long index,
unsigned off, void *buf, unsigned bytes)
{
struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
struct inode *inode = &ip->i_inode;
struct address_space *mapping = inode->i_mapping;
struct page *page;
struct buffer_head *bh;
u64 blk;
unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
unsigned to_write = bytes, pg_off = off;
blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
boff = off % bsize;
page = grab_cache_page(mapping, index);
if (!page)
return -ENOMEM;
if (!page_has_buffers(page))
create_empty_buffers(page, bsize, 0);
bh = page_buffers(page);
for(;;) {
/* 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 (bh_read(bh, REQ_META | REQ_PRIO) < 0)
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;
}
break;
}
/* Write to the page, now that we have setup the buffer(s) */
memcpy_to_page(page, off, buf, bytes);
flush_dcache_page(page);
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_sbd *sdp, struct gfs2_quota *qp,
loff_t loc)
{
unsigned long pg_beg;
unsigned pg_off, nbytes, overflow = 0;
int error;
void *ptr;
nbytes = sizeof(struct gfs2_quota);
pg_beg = loc >> PAGE_SHIFT;
pg_off = offset_in_page(loc);
/* If the quota straddles a page boundary, split the write in two */
if ((pg_off + nbytes) > PAGE_SIZE)
overflow = (pg_off + nbytes) - PAGE_SIZE;
ptr = qp;
error = gfs2_write_buf_to_page(sdp, pg_beg, pg_off, ptr,
nbytes - overflow);
/* If there's an overflow, write the remaining bytes to the next page */
if (!error && overflow)
error = gfs2_write_buf_to_page(sdp, pg_beg + 1, 0,
ptr + nbytes - overflow,
overflow);
return error;
}
/**
* gfs2_adjust_quota - adjust record of current block usage
* @sdp: The superblock
* @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_sbd *sdp, loff_t loc,
s64 change, struct gfs2_quota_data *qd,
struct qc_dqblk *fdq)
{
struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
struct inode *inode = &ip->i_inode;
struct gfs2_quota q;
int err;
u64 size;
if (gfs2_is_stuffed(ip)) {
err = gfs2_unstuff_dinode(ip);
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 */
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(sdp, &q, loc);
if (!err) {
size = loc + sizeof(struct gfs2_quota);
if (size > inode->i_size)
i_size_write(inode, size);
inode_set_mtime_to_ts(inode, inode_set_ctime_current(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_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;
gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
&data_blocks, &ind_blocks);
ghs = kmalloc_array(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_dq;
}
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
if (error)
goto out_dq;
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(sdp, offset, qd->qd_change_sync, qd,
NULL);
if (error)
goto out_end_trans;
do_qc(qd, -qd->qd_change_sync, QC_SYNC);
set_bit(QDF_REFRESH, &qd->qd_flags);
}
out_end_trans:
gfs2_trans_end(sdp);
out_ipres:
gfs2_inplace_release(ip);
out_alloc:
gfs2_glock_dq_uninit(&i_gh);
out_dq:
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);
if (!error) {
for (x = 0; x < num_qd; x++)
qda[x]->qd_sync_gen = sdp->sd_quota_sync_gen;
}
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;