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kernel-fxtec-pro1x/fs/gfs2/quota.c
Steven Whitehouse e9fc2aa091 [GFS2] Update copyright, tidy up incore.h 
As per comments from Jan Engelhardt <jengelh@linux01.gwdg.de> this
updates the copyright message to say "version" in full rather than
"v.2". Also incore.h has been updated to remove forward structure
declarations which are not required.

The gfs2_quota_lvb structure has now had endianess annotations added
to it. Also quota.c has been updated so that we now store the
lvb data locally in endian independant format to avoid needing
a structure in host endianess too. As a result the endianess
conversions are done as required at various points and thus the
conversion routines in lvb.[ch] are no longer required. I've
moved the one remaining constant in lvb.h thats used into lm.h
and removed the unused lvb.[ch].

I have not changed the HIF_ constants. That is left to a later patch
which I hope will unify the gh_flags and gh_iflags fields of the
struct gfs2_holder.

Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-09-01 11:05:15 -04:00

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/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License version 2.
*/
/*
* Quota change tags are associated with each transaction that allocates or
* deallocates space. Those changes are accumulated locally to each node (in a
* per-node file) and then are periodically synced to the quota file. This
* avoids the bottleneck of constantly touching the quota file, but introduces
* fuzziness in the current usage value of IDs that are being used on different
* nodes in the cluster simultaneously. So, it is possible for a user on
* multiple nodes to overrun their quota, but that overrun is controlable.
* Since quota tags are part of transactions, there is no need 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/sort.h>
#include <linux/fs.h>
#include <linux/gfs2_ondisk.h>
#include "gfs2.h"
#include "lm_interface.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 "ops_file.h"
#include "ops_address.h"
#include "util.h"
#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;
struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
unsigned int block, offset;
uint64_t dblock;
int new = 0;
struct buffer_head *bh;
int error;
int boundary;
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_block_map(&ip->i_inode, block, &new, &dblock, &boundary);
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));
mutex_lock(&sdp->sd_quota_mutex);
return 0;
fail_brelse:
brelse(bh);
fail:
qd->qd_bh_count--;
mutex_unlock(&sdp->sd_quota_mutex);
return error;
}
static void bh_put(struct gfs2_quota_data *qd)
{
struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
mutex_lock(&sdp->sd_quota_mutex);
gfs2_assert(sdp, qd->qd_bh_count);
if (!--qd->qd_bh_count) {
brelse(qd->qd_bh);
qd->qd_bh = NULL;
qd->qd_bh_qc = NULL;
}
mutex_unlock(&sdp->sd_quota_mutex);
}
static int qd_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)
{
gfs2_assert_warn(qd->qd_gl->gl_sbd,
test_bit(QDF_LOCKED, &qd->qd_flags));
clear_bit(QDF_LOCKED, &qd->qd_flags);
bh_put(qd);
slot_put(qd);
qd_put(qd);
}
static int qdsb_get(struct gfs2_sbd *sdp, 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 = GFS2_SB(&ip->i_inode);
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 = GFS2_SB(&ip->i_inode);
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;
struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
struct gfs2_quota_change *qc = qd->qd_bh_qc;
int64_t x;
mutex_lock(&sdp->sd_quota_mutex);
gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
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);
}
mutex_unlock(&sdp->sd_quota_mutex);
}
/**
* 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)
{
struct inode *inode = &ip->i_inode;
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;
s64 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 = (s64)be64_to_cpu(*ptr) + change;
*ptr = cpu_to_be64(value);
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;
}
static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
{
struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
unsigned int data_blocks, ind_blocks;
struct gfs2_holder *ghs, i_gh;
unsigned int qx, x;
struct gfs2_quota_data *qd;
loff_t offset;
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;
}
for (x = 0; x < num_qd; x++) {
qd = qda[x];
offset = qd2offset(qd);
error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync,
(struct gfs2_quota_data *)
qd->qd_gl->gl_lvb);
if (error)
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);
gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
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;
struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
struct gfs2_holder i_gh;
struct gfs2_quota q;
char buf[sizeof(struct gfs2_quota)];
struct file_ra_state ra_state;
int error;
struct gfs2_quota_lvb *qlvb;
file_ra_state_init(&ra_state, sdp->sd_quota_inode->i_mapping);
restart:
error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
if (error)
return error;
qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
loff_t pos;
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;
memset(buf, 0, sizeof(struct gfs2_quota));
pos = qd2offset(qd);
error = gfs2_internal_read(ip, &ra_state, buf,
&pos, sizeof(struct gfs2_quota));
if (error < 0)
goto fail_gunlock;
gfs2_glock_dq_uninit(&i_gh);
gfs2_quota_in(&q, buf);
qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
qlvb->__pad = 0;
qlvb->qb_limit = cpu_to_be64(q.qu_limit);
qlvb->qb_warn = cpu_to_be64(q.qu_warn);
qlvb->qb_value = cpu_to_be64(q.qu_value);
qd->qd_qb = *qlvb;
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 = GFS2_SB(&ip->i_inode);
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 ((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;
do_div(value, den);
value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
if (value < (int64_t)be64_to_cpu(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;
printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\r\n",
sdp->sd_fsname, type,
(test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
qd->qd_id);
return 0;
}
int gfs2_quota_check(struct gfs2_inode *ip, uint32_t uid, uint32_t gid)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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 = (s64)be64_to_cpu(qd->qd_qb.qb_value);
spin_lock(&sdp->sd_quota_spin);
value += qd->qd_change;
spin_unlock(&sdp->sd_quota_spin);
if (be64_to_cpu(qd->qd_qb.qb_limit) && (int64_t)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
print_message(qd, "exceeded");
error = -EDQUOT;
break;
} else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
(int64_t)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
time_after_eq(jiffies, qd->qd_last_warn +
gfs2_tune_get(sdp,
gt_quota_warn_period) * HZ)) {
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(GFS2_SB(&ip->i_inode), 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;
}
#if 0
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 = be64_to_cpu(qd->qd_qb.qb_limit);
q->qu_warn = be64_to_cpu(qd->qd_qb.qb_warn);
q->qu_value = be64_to_cpu(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;
}
#endif /* 0 */
int gfs2_quota_init(struct gfs2_sbd *sdp)
{
struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
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;
sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
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;
error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
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);
}
}
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