quota.c 28.5 KB
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/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
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 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
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 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License v.2.
 */

/*
 * Quota change tags are associated with each transaction that allocates or
 * deallocates space.  Those changes are accumulated locally to each node (in a
 * per-node file) and then are periodically synced to the quota file.  This
 * avoids the bottleneck of constantly touching the quota file, but introduces
 * fuzziness in the current usage value of IDs that are being used on different
 * nodes in the cluster simultaneously.  So, it is possible for a user on
 * multiple nodes to overrun their quota, but that overrun is controlable.
 * Since quota tags are part of transactions, there is no need to 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.
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/tty.h>
#include <linux/sort.h>
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#include <linux/fs.h>
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#include <linux/gfs2_ondisk.h>
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#include "gfs2.h"
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#include "lm_interface.h"
#include "incore.h"
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#include "bmap.h"
#include "glock.h"
#include "glops.h"
#include "log.h"
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#include "lvb.h"
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#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "super.h"
#include "trans.h"
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#include "inode.h"
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#include "ops_file.h"
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#include "ops_address.h"
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#include "util.h"
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#define QUOTA_USER 1
#define QUOTA_GROUP 0

static uint64_t qd2offset(struct gfs2_quota_data *qd)
{
	uint64_t offset;

	offset = 2 * (uint64_t)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
	offset *= sizeof(struct gfs2_quota);

	return offset;
}

static int qd_alloc(struct gfs2_sbd *sdp, int user, uint32_t id,
		    struct gfs2_quota_data **qdp)
{
	struct gfs2_quota_data *qd;
	int error;

	qd = kzalloc(sizeof(struct gfs2_quota_data), GFP_KERNEL);
	if (!qd)
		return -ENOMEM;

	qd->qd_count = 1;
	qd->qd_id = id;
	if (user)
		set_bit(QDF_USER, &qd->qd_flags);
	qd->qd_slot = -1;

	error = gfs2_glock_get(sdp, 2 * (uint64_t)id + !user,
			      &gfs2_quota_glops, CREATE, &qd->qd_gl);
	if (error)
		goto fail;

	error = gfs2_lvb_hold(qd->qd_gl);
	gfs2_glock_put(qd->qd_gl);
	if (error)
		goto fail;

	*qdp = qd;

	return 0;

 fail:
	kfree(qd);
	return error;
}

static int qd_get(struct gfs2_sbd *sdp, int user, uint32_t id, int create,
		  struct gfs2_quota_data **qdp)
{
	struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
	int error, found;

	*qdp = NULL;

	for (;;) {
		found = 0;
		spin_lock(&sdp->sd_quota_spin);
		list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
			if (qd->qd_id == id &&
			    !test_bit(QDF_USER, &qd->qd_flags) == !user) {
				qd->qd_count++;
				found = 1;
				break;
			}
		}

		if (!found)
			qd = NULL;

		if (!qd && new_qd) {
			qd = new_qd;
			list_add(&qd->qd_list, &sdp->sd_quota_list);
			atomic_inc(&sdp->sd_quota_count);
			new_qd = NULL;
		}

		spin_unlock(&sdp->sd_quota_spin);

		if (qd || !create) {
			if (new_qd) {
				gfs2_lvb_unhold(new_qd->qd_gl);
				kfree(new_qd);
			}
			*qdp = qd;
			return 0;
		}

		error = qd_alloc(sdp, user, id, &new_qd);
		if (error)
			return error;
	}
}

static void qd_hold(struct gfs2_quota_data *qd)
{
	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;

	spin_lock(&sdp->sd_quota_spin);
	gfs2_assert(sdp, qd->qd_count);
	qd->qd_count++;
	spin_unlock(&sdp->sd_quota_spin);
}

static void qd_put(struct gfs2_quota_data *qd)
{
	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
	spin_lock(&sdp->sd_quota_spin);
	gfs2_assert(sdp, qd->qd_count);
	if (!--qd->qd_count)
		qd->qd_last_touched = jiffies;
	spin_unlock(&sdp->sd_quota_spin);
}

static int slot_get(struct gfs2_quota_data *qd)
{
	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
	unsigned int c, o = 0, b;
	unsigned char byte = 0;

	spin_lock(&sdp->sd_quota_spin);

	if (qd->qd_slot_count++) {
		spin_unlock(&sdp->sd_quota_spin);
		return 0;
	}

	for (c = 0; c < sdp->sd_quota_chunks; c++)
		for (o = 0; o < PAGE_SIZE; o++) {
			byte = sdp->sd_quota_bitmap[c][o];
			if (byte != 0xFF)
				goto found;
		}

	goto fail;

 found:
	for (b = 0; b < 8; b++)
		if (!(byte & (1 << b)))
			break;
	qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;

	if (qd->qd_slot >= sdp->sd_quota_slots)
		goto fail;

	sdp->sd_quota_bitmap[c][o] |= 1 << b;

	spin_unlock(&sdp->sd_quota_spin);

	return 0;

 fail:
	qd->qd_slot_count--;
	spin_unlock(&sdp->sd_quota_spin);
	return -ENOSPC;
}

static void slot_hold(struct gfs2_quota_data *qd)
{
	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;

	spin_lock(&sdp->sd_quota_spin);
	gfs2_assert(sdp, qd->qd_slot_count);
	qd->qd_slot_count++;
	spin_unlock(&sdp->sd_quota_spin);
}

static void slot_put(struct gfs2_quota_data *qd)
{
	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;

	spin_lock(&sdp->sd_quota_spin);
	gfs2_assert(sdp, qd->qd_slot_count);
	if (!--qd->qd_slot_count) {
		gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
		qd->qd_slot = -1;
	}
	spin_unlock(&sdp->sd_quota_spin);
}

static int bh_get(struct gfs2_quota_data *qd)
{
	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
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	struct gfs2_inode *ip = sdp->sd_qc_inode->u.generic_ip;
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	unsigned int block, offset;
	uint64_t dblock;
	int new = 0;
	struct buffer_head *bh;
	int error;
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	int boundary;
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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;
	}

	block = qd->qd_slot / sdp->sd_qc_per_block;
	offset = qd->qd_slot % sdp->sd_qc_per_block;;

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	error = gfs2_block_map(ip->i_vnode, block, &new, &dblock, &boundary);
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	if (error)
		goto fail;
	error = gfs2_meta_read(ip->i_gl, dblock, DIO_START | DIO_WAIT, &bh);
	if (error)
		goto fail;
	error = -EIO;
	if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
		goto fail_brelse;

	qd->qd_bh = bh;
	qd->qd_bh_qc = (struct gfs2_quota_change *)
		(bh->b_data + sizeof(struct gfs2_meta_header) +
		 offset * sizeof(struct gfs2_quota_change));

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	mutex_lock(&sdp->sd_quota_mutex);
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	return 0;

 fail_brelse:
	brelse(bh);

 fail:
	qd->qd_bh_count--;
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	mutex_unlock(&sdp->sd_quota_mutex);
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	return error;
}

static void bh_put(struct gfs2_quota_data *qd)
{
	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;

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	mutex_lock(&sdp->sd_quota_mutex);
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	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;
	}
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	mutex_unlock(&sdp->sd_quota_mutex);
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}

static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
{
	struct gfs2_quota_data *qd = NULL;
	int error;
	int found = 0;

	*qdp = NULL;

	if (sdp->sd_vfs->s_flags & MS_RDONLY)
		return 0;

	spin_lock(&sdp->sd_quota_spin);

	list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
		if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
		    !test_bit(QDF_CHANGE, &qd->qd_flags) ||
		    qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
			continue;

		list_move_tail(&qd->qd_list, &sdp->sd_quota_list);

		set_bit(QDF_LOCKED, &qd->qd_flags);
		gfs2_assert_warn(sdp, qd->qd_count);
		qd->qd_count++;
		qd->qd_change_sync = qd->qd_change;
		gfs2_assert_warn(sdp, qd->qd_slot_count);
		qd->qd_slot_count++;
		found = 1;

		break;
	}

	if (!found)
		qd = NULL;

	spin_unlock(&sdp->sd_quota_spin);

	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 int qd_trylock(struct gfs2_quota_data *qd)
{
	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;

	if (sdp->sd_vfs->s_flags & MS_RDONLY)
		return 0;

	spin_lock(&sdp->sd_quota_spin);

	if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
	    !test_bit(QDF_CHANGE, &qd->qd_flags)) {
		spin_unlock(&sdp->sd_quota_spin);
		return 0;
	}

	list_move_tail(&qd->qd_list, &sdp->sd_quota_list);

	set_bit(QDF_LOCKED, &qd->qd_flags);
	gfs2_assert_warn(sdp, qd->qd_count);
	qd->qd_count++;
	qd->qd_change_sync = qd->qd_change;
	gfs2_assert_warn(sdp, qd->qd_slot_count);
	qd->qd_slot_count++;

	spin_unlock(&sdp->sd_quota_spin);

	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);
		return 0;
	}

	return 1;
}

static void qd_unlock(struct gfs2_quota_data *qd)
{
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	gfs2_assert_warn(qd->qd_gl->gl_sbd,
			 test_bit(QDF_LOCKED, &qd->qd_flags));
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	clear_bit(QDF_LOCKED, &qd->qd_flags);
	bh_put(qd);
	slot_put(qd);
	qd_put(qd);
}

static int qdsb_get(struct gfs2_sbd *sdp, int user, uint32_t id, int create,
		    struct gfs2_quota_data **qdp)
{
	int error;

	error = qd_get(sdp, user, id, create, qdp);
	if (error)
		return error;

	error = slot_get(*qdp);
	if (error)
		goto fail;

	error = bh_get(*qdp);
	if (error)
		goto fail_slot;

	return 0;

 fail_slot:
	slot_put(*qdp);

 fail:
	qd_put(*qdp);
	return error;
}

static void qdsb_put(struct gfs2_quota_data *qd)
{
	bh_put(qd);
	slot_put(qd);
	qd_put(qd);
}

int gfs2_quota_hold(struct gfs2_inode *ip, uint32_t uid, uint32_t gid)
{
	struct gfs2_sbd *sdp = ip->i_sbd;
	struct gfs2_alloc *al = &ip->i_alloc;
	struct gfs2_quota_data **qd = al->al_qd;
	int error;

	if (gfs2_assert_warn(sdp, !al->al_qd_num) ||
	    gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
		return -EIO;

	if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
		return 0;

	error = qdsb_get(sdp, QUOTA_USER, ip->i_di.di_uid, CREATE, qd);
	if (error)
		goto out;
	al->al_qd_num++;
	qd++;

	error = qdsb_get(sdp, QUOTA_GROUP, ip->i_di.di_gid, CREATE, qd);
	if (error)
		goto out;
	al->al_qd_num++;
	qd++;

	if (uid != NO_QUOTA_CHANGE && uid != ip->i_di.di_uid) {
		error = qdsb_get(sdp, QUOTA_USER, uid, CREATE, qd);
		if (error)
			goto out;
		al->al_qd_num++;
		qd++;
	}

	if (gid != NO_QUOTA_CHANGE && gid != ip->i_di.di_gid) {
		error = qdsb_get(sdp, QUOTA_GROUP, gid, CREATE, qd);
		if (error)
			goto out;
		al->al_qd_num++;
		qd++;
	}

 out:
	if (error)
		gfs2_quota_unhold(ip);

	return error;
}

void gfs2_quota_unhold(struct gfs2_inode *ip)
{
	struct gfs2_sbd *sdp = ip->i_sbd;
	struct gfs2_alloc *al = &ip->i_alloc;
	unsigned int x;

	gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));

	for (x = 0; x < al->al_qd_num; x++) {
		qdsb_put(al->al_qd[x]);
		al->al_qd[x] = NULL;
	}
	al->al_qd_num = 0;
}

static int sort_qd(const void *a, const void *b)
{
	struct gfs2_quota_data *qd_a = *(struct gfs2_quota_data **)a;
	struct gfs2_quota_data *qd_b = *(struct gfs2_quota_data **)b;
	int ret = 0;

	if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
	    !test_bit(QDF_USER, &qd_b->qd_flags)) {
		if (test_bit(QDF_USER, &qd_a->qd_flags))
			ret = -1;
		else
			ret = 1;
	} else {
		if (qd_a->qd_id < qd_b->qd_id)
			ret = -1;
		else if (qd_a->qd_id > qd_b->qd_id)
			ret = 1;
	}

	return ret;
}

static void do_qc(struct gfs2_quota_data *qd, int64_t change)
{
	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
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	struct gfs2_inode *ip = sdp->sd_qc_inode->u.generic_ip;
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	struct gfs2_quota_change *qc = qd->qd_bh_qc;
	int64_t x;

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	mutex_lock(&sdp->sd_quota_mutex);
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	gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
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	if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
		qc->qc_change = 0;
		qc->qc_flags = 0;
		if (test_bit(QDF_USER, &qd->qd_flags))
			qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
		qc->qc_id = cpu_to_be32(qd->qd_id);
	}

	x = qc->qc_change;
	x = be64_to_cpu(x) + change;
	qc->qc_change = cpu_to_be64(x);

	spin_lock(&sdp->sd_quota_spin);
	qd->qd_change = x;
	spin_unlock(&sdp->sd_quota_spin);

	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);
	}
			
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	mutex_unlock(&sdp->sd_quota_mutex);
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}

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/**
 * gfs2_adjust_quota
 *
 * This function was mostly borrowed from gfs2_block_truncate_page which was
 * in turn mostly borrowed from ext3
 */
static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
			     int64_t change, struct gfs2_quota_data *qd)
{
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	struct inode *inode = ip->i_vnode;
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	struct address_space *mapping = inode->i_mapping;
	unsigned long index = loc >> PAGE_CACHE_SHIFT;
	unsigned offset = loc & (PAGE_CACHE_SHIFT - 1);
	unsigned blocksize, iblock, pos;
	struct buffer_head *bh;
	struct page *page;
	void *kaddr;
	__be64 *ptr;
	u64 value;
	int err = -EIO;

	page = grab_cache_page(mapping, index);
	if (!page)
		return -ENOMEM;

	blocksize = inode->i_sb->s_blocksize;
	iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);

	if (!page_has_buffers(page))
		create_empty_buffers(page, blocksize, 0);

	bh = page_buffers(page);
	pos = blocksize;
	while (offset >= pos) {
		bh = bh->b_this_page;
		iblock++;
		pos += blocksize;
	}

	if (!buffer_mapped(bh)) {
		gfs2_get_block(inode, iblock, bh, 1);
		if (!buffer_mapped(bh))
			goto unlock;
	}

	if (PageUptodate(page))
		set_buffer_uptodate(bh);

	if (!buffer_uptodate(bh)) {
		ll_rw_block(READ, 1, &bh);
		wait_on_buffer(bh);
		if (!buffer_uptodate(bh))
			goto unlock;
	}

	gfs2_trans_add_bh(ip->i_gl, bh, 0);

	kaddr = kmap_atomic(page, KM_USER0);
	ptr = (__be64 *)(kaddr + offset);
	value = *ptr = cpu_to_be64(be64_to_cpu(*ptr) + change);
	flush_dcache_page(page);
	kunmap_atomic(kaddr, KM_USER0);
	err = 0;
	qd->qd_qb.qb_magic = cpu_to_be32(GFS2_MAGIC);
#if 0
	qd->qd_qb.qb_limit = cpu_to_be64(q.qu_limit);
	qd->qd_qb.qb_warn = cpu_to_be64(q.qu_warn);
#endif
	qd->qd_qb.qb_value = cpu_to_be64(value);
unlock:
	unlock_page(page);
	page_cache_release(page);
	return err;
}

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static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
{
	struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
650
	struct gfs2_inode *ip = sdp->sd_quota_inode->u.generic_ip;
D
David Teigland 已提交
651
	unsigned int data_blocks, ind_blocks;
652
	struct file_ra_state ra_state;
D
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	struct gfs2_holder *ghs, i_gh;
	unsigned int qx, x;
	struct gfs2_quota_data *qd;
656
	loff_t offset;
D
David Teigland 已提交
657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
	unsigned int nalloc = 0;
	struct gfs2_alloc *al = NULL;
	int error;

	gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
			      &data_blocks, &ind_blocks);

	ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_KERNEL);
	if (!ghs)
		return -ENOMEM;

	sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
	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++) {
		int alloc_required;

		offset = qd2offset(qda[x]);
		error = gfs2_write_alloc_required(ip, offset,
						  sizeof(struct gfs2_quota),
						  &alloc_required);
		if (error)
			goto out_gunlock;
		if (alloc_required)
			nalloc++;
	}

	if (nalloc) {
		al = gfs2_alloc_get(ip);

		al->al_requested = nalloc * (data_blocks + ind_blocks);

		error = gfs2_inplace_reserve(ip);
		if (error)
			goto out_alloc;

		error = gfs2_trans_begin(sdp,
					 al->al_rgd->rd_ri.ri_length +
					 num_qd * data_blocks +
					 nalloc * ind_blocks +
					 RES_DINODE + num_qd +
					 RES_STATFS, 0);
		if (error)
			goto out_ipres;
	} else {
		error = gfs2_trans_begin(sdp,
					 num_qd * data_blocks +
					 RES_DINODE + num_qd, 0);
		if (error)
			goto out_gunlock;
	}

719
	file_ra_state_init(&ra_state, ip->i_vnode->i_mapping);
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	for (x = 0; x < num_qd; x++) {
		qd = qda[x];
		offset = qd2offset(qd);
723
		error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync,
724 725
					  (struct gfs2_quota_data *)
					  qd->qd_gl->gl_lvb);
726
		if (error)
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727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751
			goto out_end_trans;

		do_qc(qd, -qd->qd_change_sync);
	}

	error = 0;

 out_end_trans:
	gfs2_trans_end(sdp);

 out_ipres:
	if (nalloc)
		gfs2_inplace_release(ip);

 out_alloc:
	if (nalloc)
		gfs2_alloc_put(ip);

 out_gunlock:
	gfs2_glock_dq_uninit(&i_gh);

 out:
	while (qx--)
		gfs2_glock_dq_uninit(&ghs[qx]);
	kfree(ghs);
752
	gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
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	return error;
}

static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
		    struct gfs2_holder *q_gh)
{
	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
761
	struct gfs2_inode *ip = sdp->sd_quota_inode->u.generic_ip;
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	struct gfs2_holder i_gh;
	struct gfs2_quota q;
	char buf[sizeof(struct gfs2_quota)];
765
	struct file_ra_state ra_state;
D
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	int error;

768
	file_ra_state_init(&ra_state, sdp->sd_quota_inode->i_mapping);
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 restart:
	error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
	if (error)
		return error;

	gfs2_quota_lvb_in(&qd->qd_qb, qd->qd_gl->gl_lvb);

	if (force_refresh || qd->qd_qb.qb_magic != GFS2_MAGIC) {
777
		loff_t pos;
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		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;

785
		error = gfs2_glock_nq_init(ip->i_gl,
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					  LM_ST_SHARED, 0,
					  &i_gh);
		if (error)
			goto fail;

		memset(buf, 0, sizeof(struct gfs2_quota));
792
		pos = qd2offset(qd);
793
		error = gfs2_internal_read(ip,
794 795
					    &ra_state, buf,
					    &pos,
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					    sizeof(struct gfs2_quota));
		if (error < 0)
			goto fail_gunlock;

		gfs2_glock_dq_uninit(&i_gh);

		gfs2_quota_in(&q, buf);

		memset(&qd->qd_qb, 0, sizeof(struct gfs2_quota_lvb));
		qd->qd_qb.qb_magic = GFS2_MAGIC;
		qd->qd_qb.qb_limit = q.qu_limit;
		qd->qd_qb.qb_warn = q.qu_warn;
		qd->qd_qb.qb_value = q.qu_value;

		gfs2_quota_lvb_out(&qd->qd_qb, qd->qd_gl->gl_lvb);

		if (gfs2_glock_is_blocking(qd->qd_gl)) {
			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, uint32_t uid, uint32_t gid)
{
	struct gfs2_sbd *sdp = ip->i_sbd;
	struct gfs2_alloc *al = &ip->i_alloc;
	unsigned int x;
	int error = 0;

	gfs2_quota_hold(ip, uid, gid);

	if (capable(CAP_SYS_RESOURCE) ||
	    sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
		return 0;

	sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
	     sort_qd, NULL);

	for (x = 0; x < al->al_qd_num; x++) {
		error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
		if (error)
			break;
	}

	if (!error)
		set_bit(GIF_QD_LOCKED, &ip->i_flags);
	else {
		while (x--)
			gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
		gfs2_quota_unhold(ip);
	}

	return error;
}

static int need_sync(struct gfs2_quota_data *qd)
{
	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
	struct gfs2_tune *gt = &sdp->sd_tune;
	int64_t value;
	unsigned int num, den;
	int do_sync = 1;

	if (!qd->qd_qb.qb_limit)
		return 0;

	spin_lock(&sdp->sd_quota_spin);
	value = qd->qd_change;
	spin_unlock(&sdp->sd_quota_spin);

	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 (qd->qd_qb.qb_value >= (int64_t)qd->qd_qb.qb_limit)
		do_sync = 0;
	else {
		value *= gfs2_jindex_size(sdp) * num;
		do_div(value, den);
		value += qd->qd_qb.qb_value;
		if (value < (int64_t)qd->qd_qb.qb_limit)
			do_sync = 0;
	}

	return do_sync;
}

void gfs2_quota_unlock(struct gfs2_inode *ip)
{
	struct gfs2_alloc *al = &ip->i_alloc;
	struct gfs2_quota_data *qda[4];
	unsigned int count = 0;
	unsigned int x;

	if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
		goto out;

	for (x = 0; x < al->al_qd_num; x++) {
		struct gfs2_quota_data *qd;
		int sync;

		qd = al->al_qd[x];
		sync = need_sync(qd);

		gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);

		if (sync && qd_trylock(qd))
			qda[count++] = qd;
	}

	if (count) {
		do_sync(count, qda);
		for (x = 0; x < count; x++)
			qd_unlock(qda[x]);
	}

 out:
	gfs2_quota_unhold(ip);
}

#define MAX_LINE 256

static int print_message(struct gfs2_quota_data *qd, char *type)
{
	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
	char *line;
	int len;

	line = kmalloc(MAX_LINE, GFP_KERNEL);
	if (!line)
		return -ENOMEM;

943 944
	len = snprintf(line, MAX_LINE-1,
		       "GFS2: fsid=%s: quota %s for %s %u\r\n",
D
David Teigland 已提交
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		       sdp->sd_fsname, type,
		       (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
		       qd->qd_id);
	line[MAX_LINE-1] = 0;

	if (current->signal) { /* Is this test still required? */
		tty_write_message(current->signal->tty, line);
	}

	kfree(line);

	return 0;
}

int gfs2_quota_check(struct gfs2_inode *ip, uint32_t uid, uint32_t gid)
{
	struct gfs2_sbd *sdp = ip->i_sbd;
	struct gfs2_alloc *al = &ip->i_alloc;
	struct gfs2_quota_data *qd;
	int64_t value;
	unsigned int x;
	int error = 0;

	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 < al->al_qd_num; x++) {
		qd = al->al_qd[x];

		if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
		      (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
			continue;

		value = qd->qd_qb.qb_value;
		spin_lock(&sdp->sd_quota_spin);
		value += qd->qd_change;
		spin_unlock(&sdp->sd_quota_spin);

		if (qd->qd_qb.qb_limit && (int64_t)qd->qd_qb.qb_limit < value) {
			print_message(qd, "exceeded");
			error = -EDQUOT;
			break;
		} else if (qd->qd_qb.qb_warn &&
			   (int64_t)qd->qd_qb.qb_warn < value &&
			   time_after_eq(jiffies, qd->qd_last_warn +
993 994
					 gfs2_tune_get(sdp,
						gt_quota_warn_period) * HZ)) {
D
David Teigland 已提交
995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
			error = print_message(qd, "warning");
			qd->qd_last_warn = jiffies;
		}
	}

	return error;
}

void gfs2_quota_change(struct gfs2_inode *ip, int64_t change,
		       uint32_t uid, uint32_t gid)
{
	struct gfs2_alloc *al = &ip->i_alloc;
	struct gfs2_quota_data *qd;
	unsigned int x;
	unsigned int found = 0;

	if (gfs2_assert_warn(ip->i_sbd, change))
		return;
	if (ip->i_di.di_flags & GFS2_DIF_SYSTEM)
		return;

	for (x = 0; x < al->al_qd_num; x++) {
		qd = al->al_qd[x];

		if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
		    (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
			do_qc(qd, change);
			found++;
		}
	}
}

int gfs2_quota_sync(struct gfs2_sbd *sdp)
{
	struct gfs2_quota_data **qda;
	unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
	unsigned int num_qd;
	unsigned int x;
	int error = 0;

	sdp->sd_quota_sync_gen++;

	qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
	if (!qda)
		return -ENOMEM;

	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);

	kfree(qda);

	return error;
}

int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, uint32_t id)
{
	struct gfs2_quota_data *qd;
	struct gfs2_holder q_gh;
	int error;

	error = qd_get(sdp, user, id, CREATE, &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;
}

1089
#if 0
D
David Teigland 已提交
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124
int gfs2_quota_read(struct gfs2_sbd *sdp, int user, uint32_t id,
		    struct gfs2_quota *q)
{
	struct gfs2_quota_data *qd;
	struct gfs2_holder q_gh;
	int error;

	if (((user) ? (id != current->fsuid) : (!in_group_p(id))) &&
	    !capable(CAP_SYS_ADMIN))
		return -EACCES;

	error = qd_get(sdp, user, id, CREATE, &qd);
	if (error)
		return error;

	error = do_glock(qd, NO_FORCE, &q_gh);
	if (error)
		goto out;

	memset(q, 0, sizeof(struct gfs2_quota));
	q->qu_limit = qd->qd_qb.qb_limit;
	q->qu_warn = qd->qd_qb.qb_warn;
	q->qu_value = qd->qd_qb.qb_value;

	spin_lock(&sdp->sd_quota_spin);
	q->qu_value += qd->qd_change;
	spin_unlock(&sdp->sd_quota_spin);

	gfs2_glock_dq_uninit(&q_gh);

 out:
	qd_put(qd);

	return error;
}
1125
#endif  /*  0  */
D
David Teigland 已提交
1126 1127 1128

int gfs2_quota_init(struct gfs2_sbd *sdp)
{
1129
	struct gfs2_inode *ip = sdp->sd_qc_inode->u.generic_ip;
D
David Teigland 已提交
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	unsigned int blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
	unsigned int x, slot = 0;
	unsigned int found = 0;
	uint64_t dblock;
	uint32_t extlen = 0;
	int error;

	if (!ip->i_di.di_size ||
	    ip->i_di.di_size > (64 << 20) ||
	    ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1)) {
		gfs2_consist_inode(ip);
		return -EIO;		
	}
	sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1144
	sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
D
David Teigland 已提交
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164

	error = -ENOMEM;

	sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
				       sizeof(unsigned char *), GFP_KERNEL);
	if (!sdp->sd_quota_bitmap)
		return error;

	for (x = 0; x < sdp->sd_quota_chunks; x++) {
		sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_KERNEL);
		if (!sdp->sd_quota_bitmap[x])
			goto fail;
	}

	for (x = 0; x < blocks; x++) {
		struct buffer_head *bh;
		unsigned int y;

		if (!extlen) {
			int new = 0;
S
Steven Whitehouse 已提交
1165
			error = gfs2_extent_map(ip->i_vnode, x, &new, &dblock, &extlen);
D
David Teigland 已提交
1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305
			if (error)
				goto fail;
		}
		gfs2_meta_ra(ip->i_gl,  dblock, extlen);
		error = gfs2_meta_read(ip->i_gl, dblock, DIO_START | DIO_WAIT,
				       &bh);
		if (error)
			goto fail;
		error = -EIO;
		if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
			brelse(bh);
			goto fail;
		}

		for (y = 0;
		     y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
		     y++, slot++) {
			struct gfs2_quota_change qc;
			struct gfs2_quota_data *qd;

			gfs2_quota_change_in(&qc, bh->b_data +
					  sizeof(struct gfs2_meta_header) +
					  y * sizeof(struct gfs2_quota_change));
			if (!qc.qc_change)
				continue;

			error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
					 qc.qc_id, &qd);
			if (error) {
				brelse(bh);
				goto fail;
			}

			set_bit(QDF_CHANGE, &qd->qd_flags);
			qd->qd_change = qc.qc_change;
			qd->qd_slot = slot;
			qd->qd_slot_count = 1;
			qd->qd_last_touched = jiffies;

			spin_lock(&sdp->sd_quota_spin);
			gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
			list_add(&qd->qd_list, &sdp->sd_quota_list);
			atomic_inc(&sdp->sd_quota_count);
			spin_unlock(&sdp->sd_quota_spin);

			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_scan(struct gfs2_sbd *sdp)
{
	struct gfs2_quota_data *qd, *safe;
	LIST_HEAD(dead);

	spin_lock(&sdp->sd_quota_spin);
	list_for_each_entry_safe(qd, safe, &sdp->sd_quota_list, qd_list) {
		if (!qd->qd_count &&
		    time_after_eq(jiffies, qd->qd_last_touched +
			        gfs2_tune_get(sdp, gt_quota_cache_secs) * HZ)) {
			list_move(&qd->qd_list, &dead);
			gfs2_assert_warn(sdp,
					 atomic_read(&sdp->sd_quota_count) > 0);
			atomic_dec(&sdp->sd_quota_count);
		}
	}
	spin_unlock(&sdp->sd_quota_spin);

	while (!list_empty(&dead)) {
		qd = list_entry(dead.next, struct gfs2_quota_data, qd_list);
		list_del(&qd->qd_list);

		gfs2_assert_warn(sdp, !qd->qd_change);
		gfs2_assert_warn(sdp, !qd->qd_slot_count);
		gfs2_assert_warn(sdp, !qd->qd_bh_count);

		gfs2_lvb_unhold(qd->qd_gl);
		kfree(qd);
	}
}

void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
{
	struct list_head *head = &sdp->sd_quota_list;
	struct gfs2_quota_data *qd;
	unsigned int x;

	spin_lock(&sdp->sd_quota_spin);
	while (!list_empty(head)) {
		qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);

		if (qd->qd_count > 1 ||
		    (qd->qd_count && !test_bit(QDF_CHANGE, &qd->qd_flags))) {
			list_move(&qd->qd_list, head);
			spin_unlock(&sdp->sd_quota_spin);
			schedule();
			spin_lock(&sdp->sd_quota_spin);
			continue;
		}

		list_del(&qd->qd_list);
		atomic_dec(&sdp->sd_quota_count);
		spin_unlock(&sdp->sd_quota_spin);

		if (!qd->qd_count) {
			gfs2_assert_warn(sdp, !qd->qd_change);
			gfs2_assert_warn(sdp, !qd->qd_slot_count);
		} else
			gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
		gfs2_assert_warn(sdp, !qd->qd_bh_count);

		gfs2_lvb_unhold(qd->qd_gl);
		kfree(qd);

		spin_lock(&sdp->sd_quota_spin);
	}
	spin_unlock(&sdp->sd_quota_spin);

	gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));

	if (sdp->sd_quota_bitmap) {
		for (x = 0; x < sdp->sd_quota_chunks; x++)
			kfree(sdp->sd_quota_bitmap[x]);
		kfree(sdp->sd_quota_bitmap);
	}
}