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android_kernel_xiaomi_sm8350/fs/gfs2/quota.c
Steven Whitehouse 813e0c46c9 GFS2: Fix "truncate in progress" hang 
Following on from the recent clean up of gfs2_quotad, this patch moves
the processing of "truncate in progress" inodes from the glock workqueue
into gfs2_quotad. This fixes a hang due to the "truncate in progress"
processing requiring glocks in order to complete.

It might seem odd to use gfs2_quotad for this particular item, but
we have to use a pre-existing thread since creating a thread implies
a GFP_KERNEL memory allocation which is not allowed from the glock
workqueue context. Of the existing threads, gfs2_logd and gfs2_recoverd
may deadlock if used for this operation. gfs2_scand and gfs2_glockd are
both scheduled for removal at some (hopefully not too distant) future
point. That leaves only gfs2_quotad whose workload is generally fairly
light and is easily adapted for this extra task.

Also, as a result of this change, it opens the way for a future patch to
make the reading of the inode's information asynchronous with respect to
the glock workqueue, which is another improvement that has been on the list
for some time now.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2009-01-05 07:39:06 +00:00

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/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2007 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/bio.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <linux/kthread.h>
#include <linux/freezer.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 "ops_address.h"
#include "util.h"
#define QUOTA_USER 1
#define QUOTA_GROUP 0
struct gfs2_quota_host {
u64 qu_limit;
u64 qu_warn;
s64 qu_value;
u32 qu_ll_next;
};
struct gfs2_quota_change_host {
u64 qc_change;
u32 qc_flags; /* GFS2_QCF_... */
u32 qc_id;
};
static u64 qd2offset(struct gfs2_quota_data *qd)
{
u64 offset;
offset = 2 * (u64)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, u32 id,
struct gfs2_quota_data **qdp)
{
struct gfs2_quota_data *qd;
int error;
qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
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 * (u64)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:
kmem_cache_free(gfs2_quotad_cachep, qd);
return error;
}
static int qd_get(struct gfs2_sbd *sdp, int user, u32 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);
kmem_cache_free(gfs2_quotad_cachep, 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;
struct buffer_head *bh;
int error;
struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
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;
bh_map.b_size = 1 << ip->i_inode.i_blkbits;
error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
if (error)
goto fail;
error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, 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_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_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, u32 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, u32 uid, u32 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_inode.i_uid, CREATE, qd);
if (error)
goto out;
al->al_qd_num++;
qd++;
error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, CREATE, qd);
if (error)
goto out;
al->al_qd_num++;
qd++;
if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_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_inode.i_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)
{
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 (!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))
return -1;
else
return 1;
}
if (qd_a->qd_id < qd_b->qd_id)
return -1;
if (qd_a->qd_id > qd_b->qd_id)
return 1;
return 0;
}
static void do_qc(struct gfs2_quota_data *qd, s64 change)
{
struct gfs2_sbd *sdp = qd->qd_gl->gl_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_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 = be64_to_cpu(qc->qc_change) + 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);
}
static void gfs2_quota_in(struct gfs2_quota_host *qu, const void *buf)
{
const struct gfs2_quota *str = buf;
qu->qu_limit = be64_to_cpu(str->qu_limit);
qu->qu_warn = be64_to_cpu(str->qu_warn);
qu->qu_value = be64_to_cpu(str->qu_value);
qu->qu_ll_next = be32_to_cpu(str->qu_ll_next);
}
static void gfs2_quota_out(const struct gfs2_quota_host *qu, void *buf)
{
struct gfs2_quota *str = buf;
str->qu_limit = cpu_to_be64(qu->qu_limit);
str->qu_warn = cpu_to_be64(qu->qu_warn);
str->qu_value = cpu_to_be64(qu->qu_value);
str->qu_ll_next = cpu_to_be32(qu->qu_ll_next);
memset(&str->qu_reserved, 0, sizeof(str->qu_reserved));
}
/**
* 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,
s64 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_SIZE - 1);
unsigned blocksize, iblock, pos;
struct buffer_head *bh;
struct page *page;
void *kaddr;
char *ptr;
struct gfs2_quota_host qp;
s64 value;
int err = -EIO;
if (gfs2_is_stuffed(ip))
gfs2_unstuff_dinode(ip, NULL);
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_block_map(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_META, 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 = kaddr + offset;
gfs2_quota_in(&qp, ptr);
qp.qu_value += change;
value = qp.qu_value;
gfs2_quota_out(&qp, ptr);
flush_dcache_page(page);
kunmap_atomic(kaddr, KM_USER0);
err = 0;
qd->qd_qb.qb_magic = cpu_to_be32(GFS2_MAGIC);
qd->qd_qb.qb_value = cpu_to_be64(value);
((struct gfs2_quota_lvb*)(qd->qd_gl->gl_lvb))->qb_magic = cpu_to_be32(GFS2_MAGIC);
((struct gfs2_quota_lvb*)(qd->qd_gl->gl_lvb))->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, blocks;
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_NOFS);
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++;
}
al = gfs2_alloc_get(ip);
if (!al) {
error = -ENOMEM;
goto out_gunlock;
}
/*
* 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
*/
al->al_requested = 1;
/* +1 in the end for block requested above for unstuffing */
blocks = num_qd * data_blocks + RES_DINODE + num_qd + 1;
if (nalloc)
al->al_requested += nalloc * (data_blocks + ind_blocks);
error = gfs2_inplace_reserve(ip);
if (error)
goto out_alloc;
if (nalloc)
blocks += al->al_rgd->rd_length + 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,
(struct gfs2_quota_data *)
qd);
if (error)
goto out_end_trans;
do_qc(qd, -qd->qd_change_sync);
}
error = 0;
out_end_trans:
gfs2_trans_end(sdp);
out_ipres:
gfs2_inplace_release(ip);
out_alloc:
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_host q;
char buf[sizeof(struct gfs2_quota)];
int error;
struct gfs2_quota_lvb *qlvb;
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, NULL, 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, u32 uid, u32 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;
s64 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;
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_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, u32 uid, u32 gid)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_alloc *al = ip->i_alloc;
struct gfs2_quota_data *qd;
s64 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) && (s64)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) &&
(s64)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, s64 change,
u32 uid, u32 gid)
{
struct gfs2_alloc *al = ip->i_alloc;
struct gfs2_quota_data *qd;
unsigned int x;
if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
return;
if (ip->i_diskflags & 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);
}
}
}
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, u32 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;
}
static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
{
const struct gfs2_quota_change *str = buf;
qc->qc_change = be64_to_cpu(str->qc_change);
qc->qc_flags = be32_to_cpu(str->qc_flags);
qc->qc_id = be32_to_cpu(str->qc_id);
}
int gfs2_quota_init(struct gfs2_sbd *sdp)
{
struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
unsigned int blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
unsigned int x, slot = 0;
unsigned int found = 0;
u64 dblock;
u32 extlen = 0;
int error;
if (!ip->i_disksize || ip->i_disksize > (64 << 20) ||
ip->i_disksize & (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_NOFS);
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_NOFS);
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;
}
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;
}
for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
y++, slot++) {
struct gfs2_quota_change_host 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;
}
static 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);
kmem_cache_free(gfs2_quotad_cachep, 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);
kmem_cache_free(gfs2_quotad_cachep, 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);
}
}
static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
{
if (error == 0 || error == -EROFS)
return;
if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
}
static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
int (*fxn)(struct gfs2_sbd *sdp),
unsigned long t, unsigned long *timeo,
unsigned int *new_timeo)
{
if (t >= *timeo) {
int error = fxn(sdp);
quotad_error(sdp, msg, error);
*timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
} else {
*timeo -= t;
}
}
static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
{
struct gfs2_inode *ip;
while(1) {
ip = NULL;
spin_lock(&sdp->sd_trunc_lock);
if (!list_empty(&sdp->sd_trunc_list)) {
ip = list_entry(sdp->sd_trunc_list.next,
struct gfs2_inode, i_trunc_list);
list_del_init(&ip->i_trunc_list);
}
spin_unlock(&sdp->sd_trunc_lock);
if (ip == NULL)
return;
gfs2_glock_finish_truncate(ip);
}
}
/**
* gfs2_quotad - Write cached quota changes into the quota file
* @sdp: Pointer to GFS2 superblock
*
*/
int gfs2_quotad(void *data)
{
struct gfs2_sbd *sdp = data;
struct gfs2_tune *tune = &sdp->sd_tune;
unsigned long statfs_timeo = 0;
unsigned long quotad_timeo = 0;
unsigned long t = 0;
DEFINE_WAIT(wait);
int empty;
while (!kthread_should_stop()) {
/* Update the master statfs file */
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);
/* FIXME: This should be turned into a shrinker */
gfs2_quota_scan(sdp);
/* Check for & recover partially truncated inodes */
quotad_check_trunc_list(sdp);
if (freezing(current))
refrigerator();
t = min(quotad_timeo, statfs_timeo);
prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_UNINTERRUPTIBLE);
spin_lock(&sdp->sd_trunc_lock);
empty = list_empty(&sdp->sd_trunc_list);
spin_unlock(&sdp->sd_trunc_lock);
if (empty)
t -= schedule_timeout(t);
else
t = 0;
finish_wait(&sdp->sd_quota_wait, &wait);
}
return 0;
}
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