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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/fs/ocfs2/quota_global.c

1026 строки
29 KiB
C
Исходник Ответственный История

/*
* Implementation of operations over global quota file
*/
#include <linux/spinlock.h>
#include <linux/fs.h>
#include <linux/quota.h>
#include <linux/quotaops.h>
#include <linux/dqblk_qtree.h>
#include <linux/jiffies.h>
#include <linux/writeback.h>
#include <linux/workqueue.h>
#define MLOG_MASK_PREFIX ML_QUOTA
#include <cluster/masklog.h>
#include "ocfs2_fs.h"
#include "ocfs2.h"
#include "alloc.h"
#include "blockcheck.h"
#include "inode.h"
#include "journal.h"
#include "file.h"
#include "sysfile.h"
#include "dlmglue.h"
#include "uptodate.h"
#include "quota.h"
static struct workqueue_struct *ocfs2_quota_wq = NULL;
static void qsync_work_fn(struct work_struct *work);
static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
{
struct ocfs2_global_disk_dqblk *d = dp;
struct mem_dqblk *m = &dquot->dq_dqb;
/* Update from disk only entries not set by the admin */
if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
}
if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
}
if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
m->dqb_btime = le64_to_cpu(d->dqb_btime);
if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
m->dqb_itime = le64_to_cpu(d->dqb_itime);
OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
}
static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
{
struct ocfs2_global_disk_dqblk *d = dp;
struct mem_dqblk *m = &dquot->dq_dqb;
d->dqb_id = cpu_to_le32(dquot->dq_id);
d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
d->dqb_btime = cpu_to_le64(m->dqb_btime);
d->dqb_itime = cpu_to_le64(m->dqb_itime);
}
static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
{
struct ocfs2_global_disk_dqblk *d = dp;
struct ocfs2_mem_dqinfo *oinfo =
sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
if (qtree_entry_unused(&oinfo->dqi_gi, dp))
return 0;
return le32_to_cpu(d->dqb_id) == dquot->dq_id;
}
struct qtree_fmt_operations ocfs2_global_ops = {
.mem2disk_dqblk = ocfs2_global_mem2diskdqb,
.disk2mem_dqblk = ocfs2_global_disk2memdqb,
.is_id = ocfs2_global_is_id,
};
static int ocfs2_validate_quota_block(struct super_block *sb,
struct buffer_head *bh)
{
struct ocfs2_disk_dqtrailer *dqt =
ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
mlog(0, "Validating quota block %llu\n",
(unsigned long long)bh->b_blocknr);
BUG_ON(!buffer_uptodate(bh));
/*
* If the ecc fails, we return the error but otherwise
* leave the filesystem running. We know any error is
* local to this block.
*/
return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
}
int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
struct buffer_head **bh)
{
int rc = 0;
struct buffer_head *tmp = *bh;
rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0,
ocfs2_validate_quota_block);
if (rc)
mlog_errno(rc);
/* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
if (!rc && !*bh)
*bh = tmp;
return rc;
}
static int ocfs2_get_quota_block(struct inode *inode, int block,
struct buffer_head **bh)
{
u64 pblock, pcount;
int err;
down_read(&OCFS2_I(inode)->ip_alloc_sem);
err = ocfs2_extent_map_get_blocks(inode, block, &pblock, &pcount, NULL);
up_read(&OCFS2_I(inode)->ip_alloc_sem);
if (err) {
mlog_errno(err);
return err;
}
*bh = sb_getblk(inode->i_sb, pblock);
if (!*bh) {
err = -EIO;
mlog_errno(err);
}
return err;;
}
/* Read data from global quotafile - avoid pagecache and such because we cannot
* afford acquiring the locks... We use quota cluster lock to serialize
* operations. Caller is responsible for acquiring it. */
ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
size_t len, loff_t off)
{
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
struct inode *gqinode = oinfo->dqi_gqinode;
loff_t i_size = i_size_read(gqinode);
int offset = off & (sb->s_blocksize - 1);
sector_t blk = off >> sb->s_blocksize_bits;
int err = 0;
struct buffer_head *bh;
size_t toread, tocopy;
if (off > i_size)
return 0;
if (off + len > i_size)
len = i_size - off;
toread = len;
while (toread > 0) {
tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
bh = NULL;
err = ocfs2_read_quota_block(gqinode, blk, &bh);
if (err) {
mlog_errno(err);
return err;
}
memcpy(data, bh->b_data + offset, tocopy);
brelse(bh);
offset = 0;
toread -= tocopy;
data += tocopy;
blk++;
}
return len;
}
/* Write to quotafile (we know the transaction is already started and has
* enough credits) */
ssize_t ocfs2_quota_write(struct super_block *sb, int type,
const char *data, size_t len, loff_t off)
{
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
struct inode *gqinode = oinfo->dqi_gqinode;
int offset = off & (sb->s_blocksize - 1);
sector_t blk = off >> sb->s_blocksize_bits;
int err = 0, new = 0, ja_type;
struct buffer_head *bh = NULL;
handle_t *handle = journal_current_handle();
if (!handle) {
mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
"because transaction was not started.\n",
(unsigned long long)off, (unsigned long long)len);
return -EIO;
}
if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
WARN_ON(1);
len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
}
mutex_lock_nested(&gqinode->i_mutex, I_MUTEX_QUOTA);
if (gqinode->i_size < off + len) {
down_write(&OCFS2_I(gqinode)->ip_alloc_sem);
err = ocfs2_extend_no_holes(gqinode, off + len, off);
up_write(&OCFS2_I(gqinode)->ip_alloc_sem);
if (err < 0)
goto out;
err = ocfs2_simple_size_update(gqinode,
oinfo->dqi_gqi_bh,
off + len);
if (err < 0)
goto out;
new = 1;
}
/* Not rewriting whole block? */
if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
!new) {
err = ocfs2_read_quota_block(gqinode, blk, &bh);
ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
} else {
err = ocfs2_get_quota_block(gqinode, blk, &bh);
ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
}
if (err) {
mlog_errno(err);
return err;
}
lock_buffer(bh);
if (new)
memset(bh->b_data, 0, sb->s_blocksize);
memcpy(bh->b_data + offset, data, len);
flush_dcache_page(bh->b_page);
set_buffer_uptodate(bh);
unlock_buffer(bh);
ocfs2_set_buffer_uptodate(gqinode, bh);
err = ocfs2_journal_access_dq(handle, gqinode, bh, ja_type);
if (err < 0) {
brelse(bh);
goto out;
}
err = ocfs2_journal_dirty(handle, bh);
brelse(bh);
if (err < 0)
goto out;
out:
if (err) {
mutex_unlock(&gqinode->i_mutex);
mlog_errno(err);
return err;
}
gqinode->i_version++;
ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
mutex_unlock(&gqinode->i_mutex);
return len;
}
int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
{
int status;
struct buffer_head *bh = NULL;
status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
if (status < 0)
return status;
spin_lock(&dq_data_lock);
if (!oinfo->dqi_gqi_count++)
oinfo->dqi_gqi_bh = bh;
else
WARN_ON(bh != oinfo->dqi_gqi_bh);
spin_unlock(&dq_data_lock);
return 0;
}
void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
{
ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
brelse(oinfo->dqi_gqi_bh);
spin_lock(&dq_data_lock);
if (!--oinfo->dqi_gqi_count)
oinfo->dqi_gqi_bh = NULL;
spin_unlock(&dq_data_lock);
}
/* Read information header from global quota file */
int ocfs2_global_read_info(struct super_block *sb, int type)
{
struct inode *gqinode = NULL;
unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
GROUP_QUOTA_SYSTEM_INODE };
struct ocfs2_global_disk_dqinfo dinfo;
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
int status;
mlog_entry_void();
/* Read global header */
gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
OCFS2_INVALID_SLOT);
if (!gqinode) {
mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
type);
status = -EINVAL;
goto out_err;
}
oinfo->dqi_gi.dqi_sb = sb;
oinfo->dqi_gi.dqi_type = type;
ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
oinfo->dqi_gqi_bh = NULL;
oinfo->dqi_gqi_count = 0;
oinfo->dqi_gqinode = gqinode;
status = ocfs2_lock_global_qf(oinfo, 0);
if (status < 0) {
mlog_errno(status);
goto out_err;
}
status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
sizeof(struct ocfs2_global_disk_dqinfo),
OCFS2_GLOBAL_INFO_OFF);
ocfs2_unlock_global_qf(oinfo, 0);
if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
status);
if (status >= 0)
status = -EIO;
mlog_errno(status);
goto out_err;
}
info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
oinfo->dqi_syncjiff = msecs_to_jiffies(oinfo->dqi_syncms);
oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
OCFS2_QBLK_RESERVED_SPACE;
oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
oinfo->dqi_syncjiff);
out_err:
mlog_exit(status);
return status;
}
/* Write information to global quota file. Expects exlusive lock on quota
* file inode and quota info */
static int __ocfs2_global_write_info(struct super_block *sb, int type)
{
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
struct ocfs2_global_disk_dqinfo dinfo;
ssize_t size;
spin_lock(&dq_data_lock);
info->dqi_flags &= ~DQF_INFO_DIRTY;
dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
spin_unlock(&dq_data_lock);
dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
sizeof(struct ocfs2_global_disk_dqinfo),
OCFS2_GLOBAL_INFO_OFF);
if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
mlog(ML_ERROR, "Cannot write global quota info structure\n");
if (size >= 0)
size = -EIO;
return size;
}
return 0;
}
int ocfs2_global_write_info(struct super_block *sb, int type)
{
int err;
struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
err = ocfs2_qinfo_lock(info, 1);
if (err < 0)
return err;
err = __ocfs2_global_write_info(sb, type);
ocfs2_qinfo_unlock(info, 1);
return err;
}
/* Read in information from global quota file and acquire a reference to it.
* dquot_acquire() has already started the transaction and locked quota file */
int ocfs2_global_read_dquot(struct dquot *dquot)
{
int err, err2, ex = 0;
struct ocfs2_mem_dqinfo *info =
sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
err = ocfs2_qinfo_lock(info, 0);
if (err < 0)
goto out;
err = qtree_read_dquot(&info->dqi_gi, dquot);
if (err < 0)
goto out_qlock;
OCFS2_DQUOT(dquot)->dq_use_count++;
OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
if (!dquot->dq_off) { /* No real quota entry? */
/* Upgrade to exclusive lock for allocation */
err = ocfs2_qinfo_lock(info, 1);
if (err < 0)
goto out_qlock;
ex = 1;
}
err = qtree_write_dquot(&info->dqi_gi, dquot);
if (ex && info_dirty(sb_dqinfo(dquot->dq_sb, dquot->dq_type))) {
err2 = __ocfs2_global_write_info(dquot->dq_sb, dquot->dq_type);
if (!err)
err = err2;
}
out_qlock:
if (ex)
ocfs2_qinfo_unlock(info, 1);
ocfs2_qinfo_unlock(info, 0);
out:
if (err < 0)
mlog_errno(err);
return err;
}
/* Sync local information about quota modifications with global quota file.
* Caller must have started the transaction and obtained exclusive lock for
* global quota file inode */
int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
{
int err, err2;
struct super_block *sb = dquot->dq_sb;
int type = dquot->dq_type;
struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
struct ocfs2_global_disk_dqblk dqblk;
s64 spacechange, inodechange;
time_t olditime, oldbtime;
err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
sizeof(struct ocfs2_global_disk_dqblk),
dquot->dq_off);
if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
if (err >= 0) {
mlog(ML_ERROR, "Short read from global quota file "
"(%u read)\n", err);
err = -EIO;
}
goto out;
}
/* Update space and inode usage. Get also other information from
* global quota file so that we don't overwrite any changes there.
* We are */
spin_lock(&dq_data_lock);
spacechange = dquot->dq_dqb.dqb_curspace -
OCFS2_DQUOT(dquot)->dq_origspace;
inodechange = dquot->dq_dqb.dqb_curinodes -
OCFS2_DQUOT(dquot)->dq_originodes;
olditime = dquot->dq_dqb.dqb_itime;
oldbtime = dquot->dq_dqb.dqb_btime;
ocfs2_global_disk2memdqb(dquot, &dqblk);
mlog(0, "Syncing global dquot %u space %lld+%lld, inodes %lld+%lld\n",
dquot->dq_id, dquot->dq_dqb.dqb_curspace, (long long)spacechange,
dquot->dq_dqb.dqb_curinodes, (long long)inodechange);
if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
dquot->dq_dqb.dqb_curspace += spacechange;
if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
dquot->dq_dqb.dqb_curinodes += inodechange;
/* Set properly space grace time... */
if (dquot->dq_dqb.dqb_bsoftlimit &&
dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
oldbtime > 0) {
if (dquot->dq_dqb.dqb_btime > 0)
dquot->dq_dqb.dqb_btime =
min(dquot->dq_dqb.dqb_btime, oldbtime);
else
dquot->dq_dqb.dqb_btime = oldbtime;
}
} else {
dquot->dq_dqb.dqb_btime = 0;
clear_bit(DQ_BLKS_B, &dquot->dq_flags);
}
/* Set properly inode grace time... */
if (dquot->dq_dqb.dqb_isoftlimit &&
dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
olditime > 0) {
if (dquot->dq_dqb.dqb_itime > 0)
dquot->dq_dqb.dqb_itime =
min(dquot->dq_dqb.dqb_itime, olditime);
else
dquot->dq_dqb.dqb_itime = olditime;
}
} else {
dquot->dq_dqb.dqb_itime = 0;
clear_bit(DQ_INODES_B, &dquot->dq_flags);
}
/* All information is properly updated, clear the flags */
__clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
spin_unlock(&dq_data_lock);
err = ocfs2_qinfo_lock(info, freeing);
if (err < 0) {
mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
" (type=%d, id=%u)\n", dquot->dq_type,
(unsigned)dquot->dq_id);
goto out;
}
if (freeing)
OCFS2_DQUOT(dquot)->dq_use_count--;
err = qtree_write_dquot(&info->dqi_gi, dquot);
if (err < 0)
goto out_qlock;
if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
err = qtree_release_dquot(&info->dqi_gi, dquot);
if (info_dirty(sb_dqinfo(sb, type))) {
err2 = __ocfs2_global_write_info(sb, type);
if (!err)
err = err2;
}
}
out_qlock:
ocfs2_qinfo_unlock(info, freeing);
out:
if (err < 0)
mlog_errno(err);
return err;
}
/*
* Functions for periodic syncing of dquots with global file
*/
static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
{
handle_t *handle;
struct super_block *sb = dquot->dq_sb;
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
struct ocfs2_super *osb = OCFS2_SB(sb);
int status = 0;
mlog_entry("id=%u qtype=%u type=%lu device=%s\n", dquot->dq_id,
dquot->dq_type, type, sb->s_id);
if (type != dquot->dq_type)
goto out;
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
mutex_lock(&sb_dqopt(sb)->dqio_mutex);
status = ocfs2_sync_dquot(dquot);
mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
if (status < 0)
mlog_errno(status);
/* We have to write local structure as well... */
dquot_mark_dquot_dirty(dquot);
status = dquot_commit(dquot);
if (status < 0)
mlog_errno(status);
ocfs2_commit_trans(osb, handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
mlog_exit(status);
return status;
}
static void qsync_work_fn(struct work_struct *work)
{
struct ocfs2_mem_dqinfo *oinfo = container_of(work,
struct ocfs2_mem_dqinfo,
dqi_sync_work.work);
struct super_block *sb = oinfo->dqi_gqinode->i_sb;
dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
oinfo->dqi_syncjiff);
}
/*
* Wrappers for generic quota functions
*/
static int ocfs2_write_dquot(struct dquot *dquot)
{
handle_t *handle;
struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
int status = 0;
mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out;
}
status = dquot_commit(dquot);
ocfs2_commit_trans(osb, handle);
out:
mlog_exit(status);
return status;
}
int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
{
struct ocfs2_mem_dqinfo *oinfo;
int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
return 0;
oinfo = sb_dqinfo(sb, type)->dqi_priv;
/* We modify tree, leaf block, global info, local chunk header,
* global and local inode */
return oinfo->dqi_gi.dqi_qtree_depth + 2 + 1 +
2 * OCFS2_INODE_UPDATE_CREDITS;
}
static int ocfs2_release_dquot(struct dquot *dquot)
{
handle_t *handle;
struct ocfs2_mem_dqinfo *oinfo =
sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
int status = 0;
mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(osb,
ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
status = dquot_release(dquot);
ocfs2_commit_trans(osb, handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
mlog_exit(status);
return status;
}
int ocfs2_calc_qinit_credits(struct super_block *sb, int type)
{
struct ocfs2_mem_dqinfo *oinfo;
int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
struct ocfs2_dinode *lfe, *gfe;
if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
return 0;
oinfo = sb_dqinfo(sb, type)->dqi_priv;
gfe = (struct ocfs2_dinode *)oinfo->dqi_gqi_bh->b_data;
lfe = (struct ocfs2_dinode *)oinfo->dqi_lqi_bh->b_data;
/* We can extend local file + global file. In local file we
* can modify info, chunk header block and dquot block. In
* global file we can modify info, tree and leaf block */
return ocfs2_calc_extend_credits(sb, &lfe->id2.i_list, 0) +
ocfs2_calc_extend_credits(sb, &gfe->id2.i_list, 0) +
3 + oinfo->dqi_gi.dqi_qtree_depth + 2;
}
static int ocfs2_acquire_dquot(struct dquot *dquot)
{
handle_t *handle;
struct ocfs2_mem_dqinfo *oinfo =
sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
int status = 0;
mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
/* We need an exclusive lock, because we're going to update use count
* and instantiate possibly new dquot structure */
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(osb,
ocfs2_calc_qinit_credits(dquot->dq_sb, dquot->dq_type));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
status = dquot_acquire(dquot);
ocfs2_commit_trans(osb, handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
mlog_exit(status);
return status;
}
static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
{
unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
(1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
(1 << (DQ_LASTSET_B + QIF_INODES_B)) |
(1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
(1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
(1 << (DQ_LASTSET_B + QIF_ITIME_B));
int sync = 0;
int status;
struct super_block *sb = dquot->dq_sb;
int type = dquot->dq_type;
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
handle_t *handle;
struct ocfs2_super *osb = OCFS2_SB(sb);
mlog_entry("id=%u, type=%d", dquot->dq_id, type);
dquot_mark_dquot_dirty(dquot);
/* In case user set some limits, sync dquot immediately to global
* quota file so that information propagates quicker */
spin_lock(&dq_data_lock);
if (dquot->dq_flags & mask)
sync = 1;
spin_unlock(&dq_data_lock);
if (!sync) {
status = ocfs2_write_dquot(dquot);
goto out;
}
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
status = ocfs2_sync_dquot(dquot);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
/* Now write updated local dquot structure */
status = dquot_commit(dquot);
out_trans:
ocfs2_commit_trans(osb, handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
mlog_exit(status);
return status;
}
/* This should happen only after set_dqinfo(). */
static int ocfs2_write_info(struct super_block *sb, int type)
{
handle_t *handle;
int status = 0;
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
mlog_entry_void();
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
status = dquot_commit_info(sb, type);
ocfs2_commit_trans(OCFS2_SB(sb), handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
mlog_exit(status);
return status;
}
/* This is difficult. We have to lock quota inode and start transaction
* in this function but we don't want to take the penalty of exlusive
* quota file lock when we are just going to use cached structures. So
* we just take read lock check whether we have dquot cached and if so,
* we don't have to take the write lock... */
static int ocfs2_dquot_initialize(struct inode *inode, int type)
{
handle_t *handle = NULL;
int status = 0;
struct super_block *sb = inode->i_sb;
struct ocfs2_mem_dqinfo *oinfo;
int exclusive = 0;
int cnt;
qid_t id;
mlog_entry_void();
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (type != -1 && cnt != type)
continue;
if (!sb_has_quota_active(sb, cnt))
continue;
oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
status = ocfs2_lock_global_qf(oinfo, 0);
if (status < 0)
goto out;
/* This is just a performance optimization not a reliable test.
* Since we hold an inode lock, noone can actually release
* the structure until we are finished with initialization. */
if (inode->i_dquot[cnt] != NODQUOT) {
ocfs2_unlock_global_qf(oinfo, 0);
continue;
}
/* When we have inode lock, we know that no dquot_release() can
* run and thus we can safely check whether we need to
* read+modify global file to get quota information or whether
* our node already has it. */
if (cnt == USRQUOTA)
id = inode->i_uid;
else if (cnt == GRPQUOTA)
id = inode->i_gid;
else
BUG();
/* Obtain exclusion from quota off... */
down_write(&sb_dqopt(sb)->dqptr_sem);
exclusive = !dquot_is_cached(sb, id, cnt);
up_write(&sb_dqopt(sb)->dqptr_sem);
if (exclusive) {
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0) {
exclusive = 0;
mlog_errno(status);
goto out_ilock;
}
handle = ocfs2_start_trans(OCFS2_SB(sb),
ocfs2_calc_qinit_credits(sb, cnt));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
}
dquot_initialize(inode, cnt);
if (exclusive) {
ocfs2_commit_trans(OCFS2_SB(sb), handle);
ocfs2_unlock_global_qf(oinfo, 1);
}
ocfs2_unlock_global_qf(oinfo, 0);
}
mlog_exit(0);
return 0;
out_ilock:
if (exclusive)
ocfs2_unlock_global_qf(oinfo, 1);
ocfs2_unlock_global_qf(oinfo, 0);
out:
mlog_exit(status);
return status;
}
static int ocfs2_dquot_drop_slow(struct inode *inode)
{
int status = 0;
int cnt;
int got_lock[MAXQUOTAS] = {0, 0};
handle_t *handle;
struct super_block *sb = inode->i_sb;
struct ocfs2_mem_dqinfo *oinfo;
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (!sb_has_quota_active(sb, cnt))
continue;
oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
got_lock[cnt] = 1;
}
handle = ocfs2_start_trans(OCFS2_SB(sb),
ocfs2_calc_qinit_credits(sb, USRQUOTA) +
ocfs2_calc_qinit_credits(sb, GRPQUOTA));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out;
}
dquot_drop(inode);
ocfs2_commit_trans(OCFS2_SB(sb), handle);
out:
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
if (got_lock[cnt]) {
oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
ocfs2_unlock_global_qf(oinfo, 1);
}
return status;
}
/* See the comment before ocfs2_dquot_initialize. */
static int ocfs2_dquot_drop(struct inode *inode)
{
int status = 0;
struct super_block *sb = inode->i_sb;
struct ocfs2_mem_dqinfo *oinfo;
int exclusive = 0;
int cnt;
int got_lock[MAXQUOTAS] = {0, 0};
mlog_entry_void();
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (!sb_has_quota_active(sb, cnt))
continue;
oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
status = ocfs2_lock_global_qf(oinfo, 0);
if (status < 0)
goto out;
got_lock[cnt] = 1;
}
/* Lock against anyone releasing references so that when when we check
* we know we are not going to be last ones to release dquot */
down_write(&sb_dqopt(sb)->dqptr_sem);
/* Urgh, this is a terrible hack :( */
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (inode->i_dquot[cnt] != NODQUOT &&
atomic_read(&inode->i_dquot[cnt]->dq_count) > 1) {
exclusive = 1;
break;
}
}
if (!exclusive)
dquot_drop_locked(inode);
up_write(&sb_dqopt(sb)->dqptr_sem);
out:
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
if (got_lock[cnt]) {
oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
ocfs2_unlock_global_qf(oinfo, 0);
}
/* In case we bailed out because we had to do expensive locking
* do it now... */
if (exclusive)
status = ocfs2_dquot_drop_slow(inode);
mlog_exit(status);
return status;
}
static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
{
struct ocfs2_dquot *dquot =
kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
if (!dquot)
return NULL;
return &dquot->dq_dquot;
}
static void ocfs2_destroy_dquot(struct dquot *dquot)
{
kmem_cache_free(ocfs2_dquot_cachep, dquot);
}
struct dquot_operations ocfs2_quota_operations = {
.initialize = ocfs2_dquot_initialize,
.drop = ocfs2_dquot_drop,
.alloc_space = dquot_alloc_space,
.alloc_inode = dquot_alloc_inode,
.free_space = dquot_free_space,
.free_inode = dquot_free_inode,
.transfer = dquot_transfer,
.write_dquot = ocfs2_write_dquot,
.acquire_dquot = ocfs2_acquire_dquot,
.release_dquot = ocfs2_release_dquot,
.mark_dirty = ocfs2_mark_dquot_dirty,
.write_info = ocfs2_write_info,
.alloc_dquot = ocfs2_alloc_dquot,
.destroy_dquot = ocfs2_destroy_dquot,
};
int ocfs2_quota_setup(void)
{
ocfs2_quota_wq = create_workqueue("o2quot");
if (!ocfs2_quota_wq)
return -ENOMEM;
return 0;
}
void ocfs2_quota_shutdown(void)
{
if (ocfs2_quota_wq) {
flush_workqueue(ocfs2_quota_wq);
destroy_workqueue(ocfs2_quota_wq);
ocfs2_quota_wq = NULL;
}
}
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