fs/quota/quota_v2.c - kernel/mindspeed - Git at Google

 /*
  *	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/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/quotaops.h>

 #include <asm/byteorder.h>

 #include "quota_tree.h"
 #include "quotaio_v2.h"

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

 #define __QUOTA_V2_PARANOIA

 static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot);
 static void v2r0_disk2memdqb(struct dquot *dquot, void *dp);
 static int v2r0_is_id(void *dp, struct dquot *dquot);
 static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot);
 static void v2r1_disk2memdqb(struct dquot *dquot, void *dp);
 static int v2r1_is_id(void *dp, struct dquot *dquot);

 static struct qtree_fmt_operations v2r0_qtree_ops = {
 	.mem2disk_dqblk = v2r0_mem2diskdqb,
 	.disk2mem_dqblk = v2r0_disk2memdqb,
 	.is_id = v2r0_is_id,
 };

 static struct qtree_fmt_operations v2r1_qtree_ops = {
 	.mem2disk_dqblk = v2r1_mem2diskdqb,
 	.disk2mem_dqblk = v2r1_disk2memdqb,
 	.is_id = v2r1_is_id,
 };

 #define QUOTABLOCK_BITS 10
 #define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)

 static inline qsize_t v2_stoqb(qsize_t space)
 {
 	return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
 }

 static inline qsize_t v2_qbtos(qsize_t blocks)
 {
 	return blocks << QUOTABLOCK_BITS;
 }

 static int v2_read_header(struct super_block *sb, int type,
 			  struct v2_disk_dqheader *dqhead)
 {
 	ssize_t size;

 	size = sb->s_op->quota_read(sb, type, (char *)dqhead,
 				    sizeof(struct v2_disk_dqheader), 0);
 	if (size != sizeof(struct v2_disk_dqheader)) {
 		quota_error(sb, "Failed header read: expected=%zd got=%zd",
 			    sizeof(struct v2_disk_dqheader), size);
 		return 0;
 	}
 	return 1;
 }

 /* 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;
 	static const uint quota_magics[] = V2_INITQMAGICS;
 	static const uint quota_versions[] = V2_INITQVERSIONS;

 	if (!v2_read_header(sb, type, &dqhead))
 		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 v2_disk_dqheader dqhead;
 	struct mem_dqinfo *info = sb_dqinfo(sb, type);
 	struct qtree_mem_dqinfo *qinfo;
 	ssize_t size;
 	unsigned int version;

 	if (!v2_read_header(sb, type, &dqhead))
 		return -1;
 	version = le32_to_cpu(dqhead.dqh_version);
 	if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) ||
 	    (info->dqi_fmt_id == QFMT_VFS_V1 && version != 1))
 		return -1;

 	size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
 	       sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
 	if (size != sizeof(struct v2_disk_dqinfo)) {
 		quota_error(sb, "Can't read info structure");
 		return -1;
 	}
 	info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
 	if (!info->dqi_priv) {
 		printk(KERN_WARNING
 		       "Not enough memory for quota information structure.\n");
 		return -ENOMEM;
 	}
 	qinfo = info->dqi_priv;
 	if (version == 0) {
 		/* limits are stored as unsigned 32-bit data */
 		info->dqi_maxblimit = 0xffffffff;
 		info->dqi_maxilimit = 0xffffffff;
 	} else {
 		/* used space is stored as unsigned 64-bit value */
 		info->dqi_maxblimit = 0xffffffffffffffffULL;	/* 2^64-1 */
 		info->dqi_maxilimit = 0xffffffffffffffffULL;
 	}
 	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);
 	qinfo->dqi_sb = sb;
 	qinfo->dqi_type = type;
 	qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
 	qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
 	qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
 	qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
 	qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
 	qinfo->dqi_qtree_depth = qtree_depth(qinfo);
 	if (version == 0) {
 		qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk);
 		qinfo->dqi_ops = &v2r0_qtree_ops;
 	} else {
 		qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk);
 		qinfo->dqi_ops = &v2r1_qtree_ops;
 	}
 	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_dqinfo(sb, type);
 	struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
 	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(qinfo->dqi_blocks);
 	dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);
 	dinfo.dqi_free_entry = cpu_to_le32(qinfo->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)) {
 		quota_error(sb, "Can't write info structure");
 		return -1;
 	}
 	return 0;
 }

 static void v2r0_disk2memdqb(struct dquot *dquot, void *dp)
 {
 	struct v2r0_disk_dqblk *d = dp, empty;
 	struct mem_dqblk *m = &dquot->dq_dqb;

 	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 = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
 	m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
 	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
 	m->dqb_btime = le64_to_cpu(d->dqb_btime);
 	/* We need to escape back all-zero structure */
 	memset(&empty, 0, sizeof(struct v2r0_disk_dqblk));
 	empty.dqb_itime = cpu_to_le64(1);
 	if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk)))
 		m->dqb_itime = 0;
 }

 static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot)
 {
 	struct v2r0_disk_dqblk *d = dp;
 	struct mem_dqblk *m = &dquot->dq_dqb;
 	struct qtree_mem_dqinfo *info =
 			sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;

 	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(v2_stoqb(m->dqb_bhardlimit));
 	d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(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(dquot->dq_id);
 	if (qtree_entry_unused(info, dp))
 		d->dqb_itime = cpu_to_le64(1);
 }

 static int v2r0_is_id(void *dp, struct dquot *dquot)
 {
 	struct v2r0_disk_dqblk *d = dp;
 	struct qtree_mem_dqinfo *info =
 			sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;

 	if (qtree_entry_unused(info, dp))
 		return 0;
 	return le32_to_cpu(d->dqb_id) == dquot->dq_id;
 }

 static void v2r1_disk2memdqb(struct dquot *dquot, void *dp)
 {
 	struct v2r1_disk_dqblk *d = dp, empty;
 	struct mem_dqblk *m = &dquot->dq_dqb;

 	m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
 	m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
 	m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
 	m->dqb_itime = le64_to_cpu(d->dqb_itime);
 	m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit));
 	m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit));
 	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
 	m->dqb_btime = le64_to_cpu(d->dqb_btime);
 	/* We need to escape back all-zero structure */
 	memset(&empty, 0, sizeof(struct v2r1_disk_dqblk));
 	empty.dqb_itime = cpu_to_le64(1);
 	if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk)))
 		m->dqb_itime = 0;
 }

 static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot)
 {
 	struct v2r1_disk_dqblk *d = dp;
 	struct mem_dqblk *m = &dquot->dq_dqb;
 	struct qtree_mem_dqinfo *info =
 			sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;

 	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_itime = cpu_to_le64(m->dqb_itime);
 	d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit));
 	d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(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(dquot->dq_id);
 	if (qtree_entry_unused(info, dp))
 		d->dqb_itime = cpu_to_le64(1);
 }

 static int v2r1_is_id(void *dp, struct dquot *dquot)
 {
 	struct v2r1_disk_dqblk *d = dp;
 	struct qtree_mem_dqinfo *info =
 			sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;

 	if (qtree_entry_unused(info, dp))
 		return 0;
 	return le32_to_cpu(d->dqb_id) == dquot->dq_id;
 }

 static int v2_read_dquot(struct dquot *dquot)
 {
 	return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
 }

 static int v2_write_dquot(struct dquot *dquot)
 {
 	return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
 }

 static int v2_release_dquot(struct dquot *dquot)
 {
 	return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
 }

 static int v2_free_file_info(struct super_block *sb, int type)
 {
 	kfree(sb_dqinfo(sb, type)->dqi_priv);
 	return 0;
 }

 static const struct quota_format_ops v2_format_ops = {
 	.check_quota_file	= v2_check_quota_file,
 	.read_file_info		= v2_read_file_info,
 	.write_file_info	= v2_write_file_info,
 	.free_file_info		= v2_free_file_info,
 	.read_dqblk		= v2_read_dquot,
 	.commit_dqblk		= v2_write_dquot,
 	.release_dqblk		= v2_release_dquot,
 };

 static struct quota_format_type v2r0_quota_format = {
 	.qf_fmt_id	= QFMT_VFS_V0,
 	.qf_ops		= &v2_format_ops,
 	.qf_owner	= THIS_MODULE
 };

 static struct quota_format_type v2r1_quota_format = {
 	.qf_fmt_id	= QFMT_VFS_V1,
 	.qf_ops		= &v2_format_ops,
 	.qf_owner	= THIS_MODULE
 };

 static int __init init_v2_quota_format(void)
 {
 	int ret;

 	ret = register_quota_format(&v2r0_quota_format);
 	if (ret)
 		return ret;
 	return register_quota_format(&v2r1_quota_format);
 }

 static void __exit exit_v2_quota_format(void)
 {
 	unregister_quota_format(&v2r0_quota_format);
 	unregister_quota_format(&v2r1_quota_format);
 }

 module_init(init_v2_quota_format);
 module_exit(exit_v2_quota_format);
	/*
	* 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/kernel.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/quotaops.h>

	#include <asm/byteorder.h>

	#include "quota_tree.h"
	#include "quotaio_v2.h"

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

	#define __QUOTA_V2_PARANOIA

	static void v2r0_mem2diskdqb(void dp, struct dquot dquot);
	static void v2r0_disk2memdqb(struct dquot dquot, void dp);
	static int v2r0_is_id(void dp, struct dquot dquot);
	static void v2r1_mem2diskdqb(void dp, struct dquot dquot);
	static void v2r1_disk2memdqb(struct dquot dquot, void dp);
	static int v2r1_is_id(void dp, struct dquot dquot);

	static struct qtree_fmt_operations v2r0_qtree_ops = {
	.mem2disk_dqblk = v2r0_mem2diskdqb,
	.disk2mem_dqblk = v2r0_disk2memdqb,
	.is_id = v2r0_is_id,
	};

	static struct qtree_fmt_operations v2r1_qtree_ops = {
	.mem2disk_dqblk = v2r1_mem2diskdqb,
	.disk2mem_dqblk = v2r1_disk2memdqb,
	.is_id = v2r1_is_id,
	};

	#define QUOTABLOCK_BITS 10
	#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)

	static inline qsize_t v2_stoqb(qsize_t space)
	{
	return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
	}

	static inline qsize_t v2_qbtos(qsize_t blocks)
	{
	return blocks << QUOTABLOCK_BITS;
	}

	static int v2_read_header(struct super_block *sb, int type,
	struct v2_disk_dqheader *dqhead)
	{
	ssize_t size;

	size = sb->s_op->quota_read(sb, type, (char *)dqhead,
	sizeof(struct v2_disk_dqheader), 0);
	if (size != sizeof(struct v2_disk_dqheader)) {
	quota_error(sb, "Failed header read: expected=%zd got=%zd",
	sizeof(struct v2_disk_dqheader), size);
	return 0;
	}
	return 1;
	}

	/* 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;
	static const uint quota_magics[] = V2_INITQMAGICS;
	static const uint quota_versions[] = V2_INITQVERSIONS;

	if (!v2_read_header(sb, type, &dqhead))
	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 v2_disk_dqheader dqhead;
	struct mem_dqinfo *info = sb_dqinfo(sb, type);
	struct qtree_mem_dqinfo *qinfo;
	ssize_t size;
	unsigned int version;

	if (!v2_read_header(sb, type, &dqhead))
	return -1;
	version = le32_to_cpu(dqhead.dqh_version);
	if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) \|\|
	(info->dqi_fmt_id == QFMT_VFS_V1 && version != 1))
	return -1;

	size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
	sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
	if (size != sizeof(struct v2_disk_dqinfo)) {
	quota_error(sb, "Can't read info structure");
	return -1;
	}
	info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
	if (!info->dqi_priv) {
	printk(KERN_WARNING
	"Not enough memory for quota information structure.\n");
	return -ENOMEM;
	}
	qinfo = info->dqi_priv;
	if (version == 0) {
	/* limits are stored as unsigned 32-bit data */
	info->dqi_maxblimit = 0xffffffff;
	info->dqi_maxilimit = 0xffffffff;
	} else {
	/* used space is stored as unsigned 64-bit value */
	info->dqi_maxblimit = 0xffffffffffffffffULL; /* 2^64-1 */
	info->dqi_maxilimit = 0xffffffffffffffffULL;
	}
	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);
	qinfo->dqi_sb = sb;
	qinfo->dqi_type = type;
	qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
	qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
	qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
	qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
	qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
	qinfo->dqi_qtree_depth = qtree_depth(qinfo);
	if (version == 0) {
	qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk);
	qinfo->dqi_ops = &v2r0_qtree_ops;
	} else {
	qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk);
	qinfo->dqi_ops = &v2r1_qtree_ops;
	}
	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_dqinfo(sb, type);
	struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
	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(qinfo->dqi_blocks);
	dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);
	dinfo.dqi_free_entry = cpu_to_le32(qinfo->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)) {
	quota_error(sb, "Can't write info structure");
	return -1;
	}
	return 0;
	}

	static void v2r0_disk2memdqb(struct dquot dquot, void dp)
	{
	struct v2r0_disk_dqblk *d = dp, empty;
	struct mem_dqblk *m = &dquot->dq_dqb;

	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 = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
	m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
	m->dqb_btime = le64_to_cpu(d->dqb_btime);
	/* We need to escape back all-zero structure */
	memset(&empty, 0, sizeof(struct v2r0_disk_dqblk));
	empty.dqb_itime = cpu_to_le64(1);
	if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk)))
	m->dqb_itime = 0;
	}

	static void v2r0_mem2diskdqb(void dp, struct dquot dquot)
	{
	struct v2r0_disk_dqblk *d = dp;
	struct mem_dqblk *m = &dquot->dq_dqb;
	struct qtree_mem_dqinfo *info =
	sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;

	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(v2_stoqb(m->dqb_bhardlimit));
	d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(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(dquot->dq_id);
	if (qtree_entry_unused(info, dp))
	d->dqb_itime = cpu_to_le64(1);
	}

	static int v2r0_is_id(void dp, struct dquot dquot)
	{
	struct v2r0_disk_dqblk *d = dp;
	struct qtree_mem_dqinfo *info =
	sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;

	if (qtree_entry_unused(info, dp))
	return 0;
	return le32_to_cpu(d->dqb_id) == dquot->dq_id;
	}

	static void v2r1_disk2memdqb(struct dquot dquot, void dp)
	{
	struct v2r1_disk_dqblk *d = dp, empty;
	struct mem_dqblk *m = &dquot->dq_dqb;

	m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
	m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
	m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
	m->dqb_itime = le64_to_cpu(d->dqb_itime);
	m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit));
	m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit));
	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
	m->dqb_btime = le64_to_cpu(d->dqb_btime);
	/* We need to escape back all-zero structure */
	memset(&empty, 0, sizeof(struct v2r1_disk_dqblk));
	empty.dqb_itime = cpu_to_le64(1);
	if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk)))
	m->dqb_itime = 0;
	}

	static void v2r1_mem2diskdqb(void dp, struct dquot dquot)
	{
	struct v2r1_disk_dqblk *d = dp;
	struct mem_dqblk *m = &dquot->dq_dqb;
	struct qtree_mem_dqinfo *info =
	sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;

	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_itime = cpu_to_le64(m->dqb_itime);
	d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit));
	d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(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(dquot->dq_id);
	if (qtree_entry_unused(info, dp))
	d->dqb_itime = cpu_to_le64(1);
	}

	static int v2r1_is_id(void dp, struct dquot dquot)
	{
	struct v2r1_disk_dqblk *d = dp;
	struct qtree_mem_dqinfo *info =
	sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;

	if (qtree_entry_unused(info, dp))
	return 0;
	return le32_to_cpu(d->dqb_id) == dquot->dq_id;
	}

	static int v2_read_dquot(struct dquot *dquot)
	{
	return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
	}

	static int v2_write_dquot(struct dquot *dquot)
	{
	return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
	}

	static int v2_release_dquot(struct dquot *dquot)
	{
	return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
	}

	static int v2_free_file_info(struct super_block *sb, int type)
	{
	kfree(sb_dqinfo(sb, type)->dqi_priv);
	return 0;
	}

	static const struct quota_format_ops v2_format_ops = {
	.check_quota_file = v2_check_quota_file,
	.read_file_info = v2_read_file_info,
	.write_file_info = v2_write_file_info,
	.free_file_info = v2_free_file_info,
	.read_dqblk = v2_read_dquot,
	.commit_dqblk = v2_write_dquot,
	.release_dqblk = v2_release_dquot,
	};

	static struct quota_format_type v2r0_quota_format = {
	.qf_fmt_id = QFMT_VFS_V0,
	.qf_ops = &v2_format_ops,
	.qf_owner = THIS_MODULE
	};

	static struct quota_format_type v2r1_quota_format = {
	.qf_fmt_id = QFMT_VFS_V1,
	.qf_ops = &v2_format_ops,
	.qf_owner = THIS_MODULE
	};

	static int __init init_v2_quota_format(void)
	{
	int ret;

	ret = register_quota_format(&v2r0_quota_format);
	if (ret)
	return ret;
	return register_quota_format(&v2r1_quota_format);
	}

	static void __exit exit_v2_quota_format(void)
	{
	unregister_quota_format(&v2r0_quota_format);
	unregister_quota_format(&v2r1_quota_format);
	}

	module_init(init_v2_quota_format);
	module_exit(exit_v2_quota_format);