[net-next-2.6.git] / fs / quota / quota_v2.c

/*
 *	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 -1;
	}
	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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* vfsv0 quota IO operations on file
	3	*/
	4
	5	#include <linux/errno.h>
	6	#include <linux/fs.h>
	7	#include <linux/mount.h>
	8	#include <linux/dqblk_v2.h>
1da177e4 LT	9	#include <linux/kernel.h>
	10	#include <linux/init.h>
	11	#include <linux/module.h>
	12	#include <linux/slab.h>
74abb989	13	#include <linux/quotaops.h>
1da177e4 LT	14
	15	#include <asm/byteorder.h>
	16
1ccd14b9	17	#include "quota_tree.h"
cf770c13 JK	18	#include "quotaio_v2.h"
cf770c13 JK	19
1da177e4 LT	20	MODULE_AUTHOR("Jan Kara");
	21	MODULE_DESCRIPTION("Quota format v2 support");
	22	MODULE_LICENSE("GPL");
	23
	24	#define __QUOTA_V2_PARANOIA
	25
498c6015 JK	26	static void v2r0_mem2diskdqb(void dp, struct dquot dquot);
	27	static void v2r0_disk2memdqb(struct dquot dquot, void dp);
	28	static int v2r0_is_id(void dp, struct dquot dquot);
	29	static void v2r1_mem2diskdqb(void dp, struct dquot dquot);
	30	static void v2r1_disk2memdqb(struct dquot dquot, void dp);
	31	static int v2r1_is_id(void dp, struct dquot dquot);
	32
	33	static struct qtree_fmt_operations v2r0_qtree_ops = {
	34	.mem2disk_dqblk = v2r0_mem2diskdqb,
	35	.disk2mem_dqblk = v2r0_disk2memdqb,
	36	.is_id = v2r0_is_id,
	37	};
	38
	39	static struct qtree_fmt_operations v2r1_qtree_ops = {
	40	.mem2disk_dqblk = v2r1_mem2diskdqb,
	41	.disk2mem_dqblk = v2r1_disk2memdqb,
	42	.is_id = v2r1_is_id,
1ccd14b9	43	};
1da177e4	44
12095460 JK	45	#define QUOTABLOCK_BITS 10
	46	#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
	47
	48	static inline qsize_t v2_stoqb(qsize_t space)
	49	{
	50	return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
	51	}
	52
	53	static inline qsize_t v2_qbtos(qsize_t blocks)
	54	{
	55	return blocks << QUOTABLOCK_BITS;
	56	}
	57
498c6015 JK	58	static int v2_read_header(struct super_block *sb, int type,
	59	struct v2_disk_dqheader *dqhead)
	60	{
	61	ssize_t size;
	62
	63	size = sb->s_op->quota_read(sb, type, (char *)dqhead,
	64	sizeof(struct v2_disk_dqheader), 0);
	65	if (size != sizeof(struct v2_disk_dqheader)) {
fb5ffb0e JZ	66	quota_error(sb, "Failed header read: expected=%zd got=%zd",
fb5ffb0e JZ	67	sizeof(struct v2_disk_dqheader), size);
498c6015 JK	68	return 0;
	69	}
	70	return 1;
	71	}
	72
1da177e4 LT	73	/* Check whether given file is really vfsv0 quotafile */
	74	static int v2_check_quota_file(struct super_block *sb, int type)
	75	{
	76	struct v2_disk_dqheader dqhead;
1da177e4 LT	77	static const uint quota_magics[] = V2_INITQMAGICS;
	78	static const uint quota_versions[] = V2_INITQVERSIONS;
	79
498c6015	80	if (!v2_read_header(sb, type, &dqhead))
1da177e4	81	return 0;
1da177e4	82	if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] \|\|
498c6015	83	le32_to_cpu(dqhead.dqh_version) > quota_versions[type])
1da177e4 LT	84	return 0;
	85	return 1;
	86	}
	87
	88	/* Read information header from quota file */
	89	static int v2_read_file_info(struct super_block *sb, int type)
	90	{
	91	struct v2_disk_dqinfo dinfo;
498c6015	92	struct v2_disk_dqheader dqhead;
1ccd14b9	93	struct mem_dqinfo *info = sb_dqinfo(sb, type);
e3d4d56b	94	struct qtree_mem_dqinfo *qinfo;
1da177e4	95	ssize_t size;
498c6015 JK	96	unsigned int version;
	97
	98	if (!v2_read_header(sb, type, &dqhead))
869835df	99	return -1;
498c6015	100	version = le32_to_cpu(dqhead.dqh_version);
869835df JK	101	if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) \|\|
	102	(info->dqi_fmt_id == QFMT_VFS_V1 && version != 1))
	103	return -1;
1da177e4 LT	104
	105	size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
	106	sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
	107	if (size != sizeof(struct v2_disk_dqinfo)) {
fb5ffb0e	108	quota_error(sb, "Can't read info structure");
1da177e4 LT	109	return -1;
1da177e4 LT	110	}
e3d4d56b JK	111	info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
	112	if (!info->dqi_priv) {
	113	printk(KERN_WARNING
	114	"Not enough memory for quota information structure.\n");
	115	return -1;
	116	}
	117	qinfo = info->dqi_priv;
498c6015 JK	118	if (version == 0) {
	119	/* limits are stored as unsigned 32-bit data */
	120	info->dqi_maxblimit = 0xffffffff;
	121	info->dqi_maxilimit = 0xffffffff;
	122	} else {
	123	/* used space is stored as unsigned 64-bit value */
82fdfa92 JK	124	info->dqi_maxblimit = 0xffffffffffffffffULL; /* 2^64-1 */
82fdfa92 JK	125	info->dqi_maxilimit = 0xffffffffffffffffULL;
498c6015	126	}
1da177e4 LT	127	info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
	128	info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
	129	info->dqi_flags = le32_to_cpu(dinfo.dqi_flags);
e3d4d56b JK	130	qinfo->dqi_sb = sb;
	131	qinfo->dqi_type = type;
	132	qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
	133	qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
	134	qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
	135	qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
	136	qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
	137	qinfo->dqi_qtree_depth = qtree_depth(qinfo);
498c6015 JK	138	if (version == 0) {
	139	qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk);
	140	qinfo->dqi_ops = &v2r0_qtree_ops;
	141	} else {
	142	qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk);
	143	qinfo->dqi_ops = &v2r1_qtree_ops;
	144	}
1da177e4 LT	145	return 0;
	146	}
	147
	148	/* Write information header to quota file */
	149	static int v2_write_file_info(struct super_block *sb, int type)
	150	{
	151	struct v2_disk_dqinfo dinfo;
1ccd14b9	152	struct mem_dqinfo *info = sb_dqinfo(sb, type);
e3d4d56b	153	struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
1da177e4 LT	154	ssize_t size;
	155
	156	spin_lock(&dq_data_lock);
	157	info->dqi_flags &= ~DQF_INFO_DIRTY;
	158	dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
	159	dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
	160	dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
	161	spin_unlock(&dq_data_lock);
e3d4d56b JK	162	dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks);
	163	dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);
	164	dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry);
1da177e4 LT	165	size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
	166	sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
	167	if (size != sizeof(struct v2_disk_dqinfo)) {
fb5ffb0e	168	quota_error(sb, "Can't write info structure");
1da177e4 LT	169	return -1;
	170	}
	171	return 0;
	172	}
	173
498c6015	174	static void v2r0_disk2memdqb(struct dquot dquot, void dp)
1da177e4	175	{
498c6015	176	struct v2r0_disk_dqblk *d = dp, empty;
1ccd14b9 JK	177	struct mem_dqblk *m = &dquot->dq_dqb;
1ccd14b9 JK	178
1da177e4 LT	179	m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
	180	m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
	181	m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
	182	m->dqb_itime = le64_to_cpu(d->dqb_itime);
12095460 JK	183	m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
12095460 JK	184	m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
1da177e4 LT	185	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
1da177e4 LT	186	m->dqb_btime = le64_to_cpu(d->dqb_btime);
1ccd14b9	187	/* We need to escape back all-zero structure */
498c6015	188	memset(&empty, 0, sizeof(struct v2r0_disk_dqblk));
1ccd14b9	189	empty.dqb_itime = cpu_to_le64(1);
498c6015	190	if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk)))
1ccd14b9	191	m->dqb_itime = 0;
1da177e4 LT	192	}
1da177e4 LT	193
498c6015	194	static void v2r0_mem2diskdqb(void dp, struct dquot dquot)
1da177e4	195	{
498c6015	196	struct v2r0_disk_dqblk *d = dp;
1ccd14b9 JK	197	struct mem_dqblk *m = &dquot->dq_dqb;
1ccd14b9 JK	198	struct qtree_mem_dqinfo *info =
e3d4d56b	199	sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
1ccd14b9	200
1da177e4 LT	201	d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
	202	d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
	203	d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
	204	d->dqb_itime = cpu_to_le64(m->dqb_itime);
cf770c13 JK	205	d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit));
cf770c13 JK	206	d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit));
1da177e4 LT	207	d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
1da177e4 LT	208	d->dqb_btime = cpu_to_le64(m->dqb_btime);
1ccd14b9 JK	209	d->dqb_id = cpu_to_le32(dquot->dq_id);
	210	if (qtree_entry_unused(info, dp))
	211	d->dqb_itime = cpu_to_le64(1);
1da177e4 LT	212	}
1da177e4 LT	213
498c6015 JK	214	static int v2r0_is_id(void dp, struct dquot dquot)
	215	{
	216	struct v2r0_disk_dqblk *d = dp;
	217	struct qtree_mem_dqinfo *info =
	218	sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
	219
	220	if (qtree_entry_unused(info, dp))
	221	return 0;
	222	return le32_to_cpu(d->dqb_id) == dquot->dq_id;
	223	}
	224
	225	static void v2r1_disk2memdqb(struct dquot dquot, void dp)
	226	{
	227	struct v2r1_disk_dqblk *d = dp, empty;
	228	struct mem_dqblk *m = &dquot->dq_dqb;
	229
	230	m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
	231	m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
	232	m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
	233	m->dqb_itime = le64_to_cpu(d->dqb_itime);
	234	m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit));
	235	m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit));
	236	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
	237	m->dqb_btime = le64_to_cpu(d->dqb_btime);
	238	/* We need to escape back all-zero structure */
	239	memset(&empty, 0, sizeof(struct v2r1_disk_dqblk));
	240	empty.dqb_itime = cpu_to_le64(1);
	241	if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk)))
	242	m->dqb_itime = 0;
	243	}
	244
	245	static void v2r1_mem2diskdqb(void dp, struct dquot dquot)
	246	{
	247	struct v2r1_disk_dqblk *d = dp;
	248	struct mem_dqblk *m = &dquot->dq_dqb;
	249	struct qtree_mem_dqinfo *info =
	250	sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
	251
	252	d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
	253	d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
	254	d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
	255	d->dqb_itime = cpu_to_le64(m->dqb_itime);
	256	d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit));
	257	d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit));
	258	d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
	259	d->dqb_btime = cpu_to_le64(m->dqb_btime);
	260	d->dqb_id = cpu_to_le32(dquot->dq_id);
	261	if (qtree_entry_unused(info, dp))
	262	d->dqb_itime = cpu_to_le64(1);
	263	}
	264
	265	static int v2r1_is_id(void dp, struct dquot dquot)
1da177e4	266	{
498c6015	267	struct v2r1_disk_dqblk *d = dp;
1ccd14b9	268	struct qtree_mem_dqinfo *info =
e3d4d56b	269	sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
1da177e4	270
1ccd14b9	271	if (qtree_entry_unused(info, dp))
1da177e4	272	return 0;
1ccd14b9	273	return le32_to_cpu(d->dqb_id) == dquot->dq_id;
1da177e4 LT	274	}
1da177e4 LT	275
1ccd14b9	276	static int v2_read_dquot(struct dquot *dquot)
1da177e4	277	{
e3d4d56b	278	return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
1da177e4 LT	279	}
1da177e4 LT	280
1da177e4 LT	281	static int v2_write_dquot(struct dquot *dquot)
1da177e4 LT	282	{
e3d4d56b	283	return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
1da177e4 LT	284	}
1da177e4 LT	285
1da177e4 LT	286	static int v2_release_dquot(struct dquot *dquot)
1da177e4 LT	287	{
e3d4d56b JK	288	return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
	289	}
	290
	291	static int v2_free_file_info(struct super_block *sb, int type)
	292	{
	293	kfree(sb_dqinfo(sb, type)->dqi_priv);
	294	return 0;
1da177e4 LT	295	}
1da177e4 LT	296
1472da5f	297	static const struct quota_format_ops v2_format_ops = {
1da177e4 LT	298	.check_quota_file = v2_check_quota_file,
	299	.read_file_info = v2_read_file_info,
	300	.write_file_info = v2_write_file_info,
e3d4d56b	301	.free_file_info = v2_free_file_info,
1da177e4 LT	302	.read_dqblk = v2_read_dquot,
	303	.commit_dqblk = v2_write_dquot,
	304	.release_dqblk = v2_release_dquot,
	305	};
	306
498c6015	307	static struct quota_format_type v2r0_quota_format = {
1da177e4 LT	308	.qf_fmt_id = QFMT_VFS_V0,
	309	.qf_ops = &v2_format_ops,
	310	.qf_owner = THIS_MODULE
	311	};
	312
498c6015 JK	313	static struct quota_format_type v2r1_quota_format = {
	314	.qf_fmt_id = QFMT_VFS_V1,
	315	.qf_ops = &v2_format_ops,
	316	.qf_owner = THIS_MODULE
	317	};
	318
1da177e4 LT	319	static int __init init_v2_quota_format(void)
1da177e4 LT	320	{
498c6015 JK	321	int ret;
	322
	323	ret = register_quota_format(&v2r0_quota_format);
	324	if (ret)
	325	return ret;
	326	return register_quota_format(&v2r1_quota_format);
1da177e4 LT	327	}
	328
	329	static void __exit exit_v2_quota_format(void)
	330	{
498c6015 JK	331	unregister_quota_format(&v2r0_quota_format);
498c6015 JK	332	unregister_quota_format(&v2r1_quota_format);
1da177e4 LT	333	}
	334
	335	module_init(init_v2_quota_format);
	336	module_exit(exit_v2_quota_format);