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linux/fs/gfs2/quota.c
Bob Peterson 432928c937 gfs2: Add quota_change type 
Function do_qc has two main uses: (1) to re-sync the local quota changes
(qd) to the master quotas, and (2) normal quota changes. In the case of
normal quota changes, the change can be positive or negative, as the
quota usage goes up and down.

Before this patch function do_qc was distinguishing one from another by
whether the resulting value is or isn't zero: In the case of a re-sync
(called do_sync) the quota value is moved from the temporary value to a
master value, so the amount is added to one and subtracted from the
other. The problem is that since the values can be positive or negative
we can occasionally run into situations where we are not doing a re-sync
but the quota change just happens to cancel out the previous value.

In the case of a re-sync extra references and locks are taken, and so
do_qc needs to release them. In the case of a normal quota change, no
extra references and locks are taken, so it must not try to release
them.

The problem is: if the quota change is not a re-sync but the value just
happens to cancel out the original quota change, the resulting zero
value fools do_qc into thinking this is a re-sync and therefore it must
release the extra references. This results in problems, mainly having to
do with slot reference numbers going smaller than zero.

This patch introduces new constants, QC_SYNC and QC_CHANGE so do_qc can
really tell the difference. For QC_SYNC calls it must release the extra
references acquired by gfs2_quota_unlock's call to qd_check_sync. For
QC_CHANGE calls it does not have extra references to put.

Note that this allows quota changes back to a value of zero, and so I
removed an assert warning related to that.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
2023-07-03 22:30:48 +02:00

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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);
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_first_entry(list, struct gfs2_quota_data, qd_lru);
sdp = qd->qd_gl->gl_name.ln_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_name.ln_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_name.ln_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_gl->gl_name.ln_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, *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 = 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_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_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 (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_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;
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 (bh_read(bh, REQ_META | REQ_PRIO) < 0)
goto unlock_out;
if (gfs2_is_jdata(ip))
gfs2_trans_add_data(ip->i_gl, bh);
else
gfs2_ordered_add_inode(ip);
/* 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) */
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_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 = offset_in_page(loc);
/* 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);
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_qa_get(ip);
if (error)
return 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) {
error = -ENOMEM;
goto out;
}
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(ip, 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);
}
error = 0;
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);
out:
gfs2_qa_put(ip);
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 (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->gt_spin);
num = gt->gt_quota_scale_num;
den = gt->gt_quota_scale_den;
spin_unlock(&gt->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))
return;
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]);
}
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 at least 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;
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;
if (gfs2_assert_withdraw(sdp, ip->i_qadata &&
ip->i_qadata->qa_ref > 0))
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, QC_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);
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) {
extlen = 32;
error = gfs2_get_extent(&ip->i_inode, x, &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_last_entry(head, 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 (!gfs2_withdrawn(sdp)) {
if (!cmpxchg(&sdp->sd_log_error, 0, error))
fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, 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;
}
}
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
* @data: 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);
while (!kthread_should_stop()) {
if (gfs2_withdrawn(sdp))
goto bypass;
/* 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,
&quotad_timeo, &tune->gt_quota_quantum);
try_to_freeze();
bypass:
t = min(quotad_timeo, statfs_timeo);
prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
if (!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;
fallthrough;
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_qa_get(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:
gfs2_qa_put(ip);
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]);
}
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