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#include <linux/errno.h>

#include <linux/fs.h>

#include <linux/quota.h>

#include <linux/dqblk_v1.h>

#include <linux/quotaio_v1.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/module.h>

#include <asm/byteorder.h>

MODULE_AUTHOR("Jan Kara");

MODULE_DESCRIPTION("Old quota format support");

MODULE_LICENSE("GPL");

static void v1_disk2mem_dqblk(struct mem_dqblk *m, struct v1_disk_dqblk *d)

{

        m->dqb_ihardlimit = d->dqb_ihardlimit;

        m->dqb_isoftlimit = d->dqb_isoftlimit;

        m->dqb_curinodes = d->dqb_curinodes;

        m->dqb_bhardlimit = d->dqb_bhardlimit;

        m->dqb_bsoftlimit = d->dqb_bsoftlimit;

        m->dqb_curspace = ((qsize_t)d->dqb_curblocks) << QUOTABLOCK_BITS;

        m->dqb_itime = d->dqb_itime;

        m->dqb_btime = d->dqb_btime;

}

static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m)

{

        d->dqb_ihardlimit = m->dqb_ihardlimit;

        d->dqb_isoftlimit = m->dqb_isoftlimit;

        d->dqb_curinodes = m->dqb_curinodes;

        d->dqb_bhardlimit = m->dqb_bhardlimit;

        d->dqb_bsoftlimit = m->dqb_bsoftlimit;

        d->dqb_curblocks = toqb(m->dqb_curspace);

        d->dqb_itime = m->dqb_itime;

        d->dqb_btime = m->dqb_btime;

}

static int v1_read_dqblk(struct dquot *dquot)

{

        int type = dquot->dq_type;

        struct v1_disk_dqblk dqblk;

        if (!sb_dqopt(dquot->dq_sb)->files[type])

                return -EINVAL;

        /* Set structure to 0s in case read fails/is after end of file */

        memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));

        dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));

        v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk);

        if (dquot->dq_dqb.dqb_bhardlimit == 0 && dquot->dq_dqb.dqb_bsoftlimit == 0 &&

            dquot->dq_dqb.dqb_ihardlimit == 0 && dquot->dq_dqb.dqb_isoftlimit == 0)

                set_bit(DQ_FAKE_B, &dquot->dq_flags);

        dqstats.reads++;

        return 0;

}

static int v1_commit_dqblk(struct dquot *dquot)

{

        short type = dquot->dq_type;

        ssize_t ret;

        struct v1_disk_dqblk dqblk;

        v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);

        if (dquot->dq_id == 0) {

                dqblk.dqb_btime = sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace;

                dqblk.dqb_itime = sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace;

        }

        ret = 0;

        if (sb_dqopt(dquot->dq_sb)->files[type])

                ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type, (char *)&dqblk,

                                        sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));

        if (ret != sizeof(struct v1_disk_dqblk)) {

                printk(KERN_WARNING "VFS: dquota write failed on dev %s\n",

                        dquot->dq_sb->s_id);

                if (ret >= 0)

                        ret = -EIO;

                goto out;

        }

        ret = 0;

out:

        dqstats.writes++;

        return ret;

}

/* Magics of new quota format */

#define V2_INITQMAGICS {\

        0xd9c01f11,     /* USRQUOTA */\

        0xd9c01927      /* GRPQUOTA */\

}

/* Header of new quota format */

struct v2_disk_dqheader {

        __le32 dqh_magic;        /* Magic number identifying file */

        __le32 dqh_version;      /* File version */

};

static int v1_check_quota_file(struct super_block *sb, int type)

{

        struct inode *inode = sb_dqopt(sb)->files[type];

        ulong blocks;

        size_t off;

        struct v2_disk_dqheader dqhead;

        ssize_t size;

        loff_t isize;

        static const uint quota_magics[] = V2_INITQMAGICS;

        isize = i_size_read(inode);

        if (!isize)

                return 0;

        blocks = isize >> BLOCK_SIZE_BITS;

        off = isize & (BLOCK_SIZE - 1);

        if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) % sizeof(struct v1_disk_dqblk))

                return 0;

        /* Doublecheck whether we didn't get file with new format - with old quotactl() this could happen */

        size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);

        if (size != sizeof(struct v2_disk_dqheader))

                return 1;       /* Probably not new format */

        if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type])

                return 1;       /* Definitely not new format */

        printk(KERN_INFO "VFS: %s: Refusing to turn on old quota format on given file. It probably contains newer quota format.\n", sb->s_id);

        return 0;                /* Seems like a new format file -> refuse it */

}

static int v1_read_file_info(struct super_block *sb, int type)

{

        struct quota_info *dqopt = sb_dqopt(sb);

        struct v1_disk_dqblk dqblk;

        int ret;

        if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {

                if (ret >= 0)

                        ret = -EIO;

                goto out;

        }

        ret = 0;

        dqopt->info[type].dqi_igrace = dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;

        dqopt->info[type].dqi_bgrace = dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;

out:

        return ret;

}

static int v1_write_file_info(struct super_block *sb, int type)

{

        struct quota_info *dqopt = sb_dqopt(sb);

        struct v1_disk_dqblk dqblk;

        int ret;

        dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY;

        if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk,

            sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {

                if (ret >= 0)

                        ret = -EIO;

                goto out;

        }

        dqblk.dqb_itime = dqopt->info[type].dqi_igrace;

        dqblk.dqb_btime = dqopt->info[type].dqi_bgrace;

        ret = sb->s_op->quota_write(sb, type, (char *)&dqblk,

              sizeof(struct v1_disk_dqblk), v1_dqoff(0));

        if (ret == sizeof(struct v1_disk_dqblk))

                ret = 0;

        else if (ret > 0)

                ret = -EIO;

out:

        return ret;

}

static struct quota_format_ops v1_format_ops = {

        .check_quota_file       = v1_check_quota_file,

        .read_file_info         = v1_read_file_info,

        .write_file_info        = v1_write_file_info,

        .free_file_info         = NULL,

        .read_dqblk             = v1_read_dqblk,

        .commit_dqblk           = v1_commit_dqblk,

};

static struct quota_format_type v1_quota_format = {

        .qf_fmt_id      = QFMT_VFS_OLD,

        .qf_ops         = &v1_format_ops,

        .qf_owner       = THIS_MODULE

};

static int __init init_v1_quota_format(void)

{

        return register_quota_format(&v1_quota_format);

}

static void __exit exit_v1_quota_format(void)

{

        unregister_quota_format(&v1_quota_format);

}

module_init(init_v1_quota_format);

module_exit(exit_v1_quota_format);