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generated by cgit v1.2.2 (git 2.25.0) at 2025-09-07 22:30:41 -0400
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/*
 *	vfsv0 quota IO operations on file
 */

#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/dqblk_v2.h>
#include <linux/quotaio_v2.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <asm/byteorder.h>

MODULE_AUTHOR("Jan Kara");
MODULE_DESCRIPTION("Quota format v2 support");
MODULE_LICENSE("GPL");

#define __QUOTA_V2_PARANOIA

typedef char *dqbuf_t;

#define GETIDINDEX(id, depth) (((id) >> ((V2_DQTREEDEPTH-(depth)-1)*8)) & 0xff)
#define GETENTRIES(buf) ((struct v2_disk_dqblk *)(((char *)buf)+sizeof(struct v2_disk_dqdbheader)))

/* Check whether given file is really vfsv0 quotafile */
static int v2_check_quota_file(struct super_block *sb, int type)
{
	struct v2_disk_dqheader dqhead;
	ssize_t size;
	static const uint quota_magics[] = V2_INITQMAGICS;
	static const uint quota_versions[] = V2_INITQVERSIONS;
 
	size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);
	if (size != sizeof(struct v2_disk_dqheader)) {
		printk("quota_v2: failed read expected=%zd got=%zd\n",
			sizeof(struct v2_disk_dqheader), size);
		return 0;
	}
	if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] ||
	    le32_to_cpu(dqhead.dqh_version) != quota_versions[type])
		return 0;
	return 1;
}

/* Read information header from quota file */
static int v2_read_file_info(struct super_block *sb, int type)
{
	struct v2_disk_dqinfo dinfo;
	struct mem_dqinfo *info = sb_dqopt(sb)->info+type;
	ssize_t size;

	size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
	       sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
	if (size != sizeof(struct v2_disk_dqinfo)) {
		printk(KERN_WARNING "Can't read info structure on device %s.\n",
			sb->s_id);
		return -1;
	}
	info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
	info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
	info->dqi_flags = le32_to_cpu(dinfo.dqi_flags);
	info->u.v2_i.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
	info->u.v2_i.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
	info->u.v2_i.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
	return 0;
}

/* Write information header to quota file */
static int v2_write_file_info(struct super_block *sb, int type)
{
	struct v2_disk_dqinfo dinfo;
	struct mem_dqinfo *info = sb_dqopt(sb)->info+type;
	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);
	dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
	spin_unlock(&dq_data_lock);
	dinfo.dqi_blocks = cpu_to_le32(info->u.v2_i.dqi_blocks);
	dinfo.dqi_free_blk = cpu_to_le32(info->u.v2_i.dqi_free_blk);
	dinfo.dqi_free_entry = cpu_to_le32(info->u.v2_i.dqi_free_entry);
	size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
	       sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
	if (size != sizeof(struct v2_disk_dqinfo)) {
		printk(KERN_WARNING "Can't write info structure on device %s.\n",
			sb->s_id);
		return -1;
	}
	return 0;
}

static void disk2memdqb(struct mem_dqblk *m, struct v2_disk_dqblk *d)
{
	m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
	m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
	m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
	m->dqb_itime = le64_to_cpu(d->dqb_itime);
	m->dqb_bhardlimit = le32_to_cpu(d->dqb_bhardlimit);
	m->dqb_bsoftlimit = le32_to_cpu(d->dqb_bsoftlimit);
	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
	m->dqb_btime = le64_to_cpu(d->dqb_btime);
}

static void mem2diskdqb(struct v2_disk_dqblk *d, struct mem_dqblk *m, qid_t id)
{
	d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
	d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
	d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
	d->dqb_itime = cpu_to_le64(m->dqb_itime);
	d->dqb_bhardlimit = cpu_to_le32(m->dqb_bhardlimit);
	d->dqb_bsoftlimit = cpu_to_le32(m->dqb_bsoftlimit);
	d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
	d->dqb_btime = cpu_to_le64(m->dqb_btime);
	d->dqb_id = cpu_to_le32(id);
}

static dqbuf_t getdqbuf(void)
{
	dqbuf_t buf = kmalloc(V2_DQBLKSIZE, GFP_NOFS);
	if (!buf)
		printk(KERN_WARNING "VFS: Not enough memory for quota buffers.\n");
	return buf;
}

static inline void freedqbuf(dqbuf_t buf)
{
	kfree(buf);
}

static inline ssize_t read_blk(struct super_block *sb, int type, uint blk, dqbuf_t buf)
{
	memset(buf, 0, V2_DQBLKSIZE);
	return sb->s_op->quota_read(sb, type, (char *)buf,
	       V2_DQBLKSIZE, blk << V2_DQBLKSIZE_BITS);
}

static inline ssize_t write_blk(struct super_block *sb, int type, uint blk, dqbuf_t buf)
{
	return sb->s_op->quota_write(sb, type, (char *)buf,
	       V2_DQBLKSIZE, blk << V2_DQBLKSIZE_BITS);
}

/* Remove empty block from list and return it */
static int get_free_dqblk(struct super_block *sb, int type)
{
	dqbuf_t buf = getdqbuf();
	struct mem_dqinfo *info = sb_dqinfo(sb, type);
	struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf;
	int ret, blk;

	if (!buf)
		return -ENOMEM;
	if (info->u.v2_i.dqi_free_blk) {
		blk = info->u.v2_i.dqi_free_blk;
		if ((ret = read_blk(sb, type, blk, buf)) < 0)
			goto out_buf;
		info->u.v2_i.dqi_free_blk = le32_to_cpu(dh->dqdh_next_free);
	}
	else {
		memset(buf, 0, V2_DQBLKSIZE);
		/* Assure block allocation... */
		if ((ret = write_blk(sb, type, info->u.v2_i.dqi_blocks, buf)) < 0)
			goto out_buf;
		blk = info->u.v2_i.dqi_blocks++;
	}
	mark_info_dirty(sb, type);
	ret = blk;