[linux-2.6-block.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 const struct qtree_fmt_operations v2r0_qtree_ops = {
	.mem2disk_dqblk = v2r0_mem2diskdqb,
	.disk2mem_dqblk = v2r0_disk2memdqb,
	.is_id = v2r0_is_id,
};

static const 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_max_spc_limit = 0xffffffffLL << QUOTABLOCK_BITS;
		info->dqi_max_ino_limit = 0xffffffff;
	} else {
		/*
		 * Used space is stored as unsigned 64-bit value in bytes but
		 * quota core supports only signed 64-bit values so use that
		 * as a limit
		 */
		info->dqi_max_spc_limit = 0x7fffffffffffffffLL; /* 2^63-1 */
		info->dqi_max_ino_limit = 0x7fffffffffffffffLL;
	}
	info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
	info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
	/* No flags currently supported */
	info->dqi_flags = 0;
	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);
	/* No flags currently supported */
	dinfo.dqi_flags = cpu_to_le32(0);
	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_id.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(from_kqid(&init_user_ns, 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_id.type)->dqi_priv;

	if (qtree_entry_unused(info, dp))
		return 0;
	return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
				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_id.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(from_kqid(&init_user_ns, 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_id.type)->dqi_priv;

	if (qtree_entry_unused(info, dp))
		return 0;
	return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
				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_id.type)->dqi_priv, dquot);
}

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

static int v2_release_dquot(struct dquot *dquot)
{
	return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.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 int v2_get_next_id(struct super_block *sb, struct kqid *qid)
{
	return qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid);
}

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,
	.get_next_id		= v2_get_next_id,
};

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
d1b98c23	33	static const struct qtree_fmt_operations v2r0_qtree_ops = {
498c6015 JK	34	.mem2disk_dqblk = v2r0_mem2diskdqb,
	35	.disk2mem_dqblk = v2r0_disk2memdqb,
	36	.is_id = v2r0_is_id,
	37	};
	38
d1b98c23	39	static const struct qtree_fmt_operations v2r1_qtree_ops = {
498c6015 JK	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");
7a39de15	115	return -ENOMEM;
e3d4d56b JK	116	}
e3d4d56b JK	117	qinfo = info->dqi_priv;
498c6015 JK	118	if (version == 0) {
498c6015 JK	119	/* limits are stored as unsigned 32-bit data */
7e08da50	120	info->dqi_max_spc_limit = 0xffffffffLL << QUOTABLOCK_BITS;
b10a0819	121	info->dqi_max_ino_limit = 0xffffffff;
498c6015	122	} else {
7e08da50 JK	123	/*
	124	* Used space is stored as unsigned 64-bit value in bytes but
	125	* quota core supports only signed 64-bit values so use that
	126	* as a limit
	127	*/
	128	info->dqi_max_spc_limit = 0x7fffffffffffffffLL; /* 2^63-1 */
	129	info->dqi_max_ino_limit = 0x7fffffffffffffffLL;
498c6015	130	}
1da177e4 LT	131	info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
1da177e4 LT	132	info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
c119c5b9 JK	133	/* No flags currently supported */
c119c5b9 JK	134	info->dqi_flags = 0;
e3d4d56b JK	135	qinfo->dqi_sb = sb;
	136	qinfo->dqi_type = type;
	137	qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
	138	qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
	139	qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
	140	qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
	141	qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
	142	qinfo->dqi_qtree_depth = qtree_depth(qinfo);
498c6015 JK	143	if (version == 0) {
	144	qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk);
	145	qinfo->dqi_ops = &v2r0_qtree_ops;
	146	} else {
	147	qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk);
	148	qinfo->dqi_ops = &v2r1_qtree_ops;
	149	}
1da177e4 LT	150	return 0;
	151	}
	152
	153	/* Write information header to quota file */
	154	static int v2_write_file_info(struct super_block *sb, int type)
	155	{
	156	struct v2_disk_dqinfo dinfo;
1ccd14b9	157	struct mem_dqinfo *info = sb_dqinfo(sb, type);
e3d4d56b	158	struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
1da177e4 LT	159	ssize_t size;
	160
	161	spin_lock(&dq_data_lock);
	162	info->dqi_flags &= ~DQF_INFO_DIRTY;
	163	dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
	164	dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
c119c5b9 JK	165	/* No flags currently supported */
c119c5b9 JK	166	dinfo.dqi_flags = cpu_to_le32(0);
1da177e4	167	spin_unlock(&dq_data_lock);
e3d4d56b JK	168	dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks);
	169	dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);
	170	dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry);
1da177e4 LT	171	size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
	172	sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
	173	if (size != sizeof(struct v2_disk_dqinfo)) {
fb5ffb0e	174	quota_error(sb, "Can't write info structure");
1da177e4 LT	175	return -1;
	176	}
	177	return 0;
	178	}
	179
498c6015	180	static void v2r0_disk2memdqb(struct dquot dquot, void dp)
1da177e4	181	{
498c6015	182	struct v2r0_disk_dqblk *d = dp, empty;
1ccd14b9 JK	183	struct mem_dqblk *m = &dquot->dq_dqb;
1ccd14b9 JK	184
1da177e4 LT	185	m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
	186	m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
	187	m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
	188	m->dqb_itime = le64_to_cpu(d->dqb_itime);
12095460 JK	189	m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
12095460 JK	190	m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
1da177e4 LT	191	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
1da177e4 LT	192	m->dqb_btime = le64_to_cpu(d->dqb_btime);
1ccd14b9	193	/* We need to escape back all-zero structure */
498c6015	194	memset(&empty, 0, sizeof(struct v2r0_disk_dqblk));
1ccd14b9	195	empty.dqb_itime = cpu_to_le64(1);
498c6015	196	if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk)))
1ccd14b9	197	m->dqb_itime = 0;
1da177e4 LT	198	}
1da177e4 LT	199
498c6015	200	static void v2r0_mem2diskdqb(void dp, struct dquot dquot)
1da177e4	201	{
498c6015	202	struct v2r0_disk_dqblk *d = dp;
1ccd14b9 JK	203	struct mem_dqblk *m = &dquot->dq_dqb;
1ccd14b9 JK	204	struct qtree_mem_dqinfo *info =
4c376dca	205	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
1ccd14b9	206
1da177e4 LT	207	d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
	208	d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
	209	d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
	210	d->dqb_itime = cpu_to_le64(m->dqb_itime);
cf770c13 JK	211	d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit));
cf770c13 JK	212	d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit));
1da177e4 LT	213	d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
1da177e4 LT	214	d->dqb_btime = cpu_to_le64(m->dqb_btime);
4c376dca	215	d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
1ccd14b9 JK	216	if (qtree_entry_unused(info, dp))
1ccd14b9 JK	217	d->dqb_itime = cpu_to_le64(1);
1da177e4 LT	218	}
1da177e4 LT	219
498c6015 JK	220	static int v2r0_is_id(void dp, struct dquot dquot)
	221	{
	222	struct v2r0_disk_dqblk *d = dp;
	223	struct qtree_mem_dqinfo *info =
4c376dca	224	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
498c6015 JK	225
	226	if (qtree_entry_unused(info, dp))
	227	return 0;
4c376dca EB	228	return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
	229	le32_to_cpu(d->dqb_id)),
	230	dquot->dq_id);
498c6015 JK	231	}
	232
	233	static void v2r1_disk2memdqb(struct dquot dquot, void dp)
	234	{
	235	struct v2r1_disk_dqblk *d = dp, empty;
	236	struct mem_dqblk *m = &dquot->dq_dqb;
	237
	238	m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
	239	m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
	240	m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
	241	m->dqb_itime = le64_to_cpu(d->dqb_itime);
	242	m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit));
	243	m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit));
	244	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
	245	m->dqb_btime = le64_to_cpu(d->dqb_btime);
	246	/* We need to escape back all-zero structure */
	247	memset(&empty, 0, sizeof(struct v2r1_disk_dqblk));
	248	empty.dqb_itime = cpu_to_le64(1);
	249	if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk)))
	250	m->dqb_itime = 0;
	251	}
	252
	253	static void v2r1_mem2diskdqb(void dp, struct dquot dquot)
	254	{
	255	struct v2r1_disk_dqblk *d = dp;
	256	struct mem_dqblk *m = &dquot->dq_dqb;
	257	struct qtree_mem_dqinfo *info =
4c376dca	258	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
498c6015 JK	259
	260	d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
	261	d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
	262	d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
	263	d->dqb_itime = cpu_to_le64(m->dqb_itime);
	264	d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit));
	265	d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit));
	266	d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
	267	d->dqb_btime = cpu_to_le64(m->dqb_btime);
4c376dca	268	d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
498c6015 JK	269	if (qtree_entry_unused(info, dp))
	270	d->dqb_itime = cpu_to_le64(1);
	271	}
	272
	273	static int v2r1_is_id(void dp, struct dquot dquot)
1da177e4	274	{
498c6015	275	struct v2r1_disk_dqblk *d = dp;
1ccd14b9	276	struct qtree_mem_dqinfo *info =
4c376dca	277	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
1da177e4	278
1ccd14b9	279	if (qtree_entry_unused(info, dp))
1da177e4	280	return 0;
4c376dca EB	281	return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
	282	le32_to_cpu(d->dqb_id)),
	283	dquot->dq_id);
1da177e4 LT	284	}
1da177e4 LT	285
1ccd14b9	286	static int v2_read_dquot(struct dquot *dquot)
1da177e4	287	{
4c376dca	288	return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
1da177e4 LT	289	}
1da177e4 LT	290
1da177e4 LT	291	static int v2_write_dquot(struct dquot *dquot)
1da177e4 LT	292	{
4c376dca	293	return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
1da177e4 LT	294	}
1da177e4 LT	295
1da177e4 LT	296	static int v2_release_dquot(struct dquot *dquot)
1da177e4 LT	297	{
4c376dca	298	return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
e3d4d56b JK	299	}
	300
	301	static int v2_free_file_info(struct super_block *sb, int type)
	302	{
	303	kfree(sb_dqinfo(sb, type)->dqi_priv);
	304	return 0;
1da177e4 LT	305	}
1da177e4 LT	306
0066373d JK	307	static int v2_get_next_id(struct super_block sb, struct kqid qid)
	308	{
	309	return qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid);
	310	}
	311
1472da5f	312	static const struct quota_format_ops v2_format_ops = {
1da177e4 LT	313	.check_quota_file = v2_check_quota_file,
	314	.read_file_info = v2_read_file_info,
	315	.write_file_info = v2_write_file_info,
e3d4d56b	316	.free_file_info = v2_free_file_info,
1da177e4 LT	317	.read_dqblk = v2_read_dquot,
	318	.commit_dqblk = v2_write_dquot,
	319	.release_dqblk = v2_release_dquot,
0066373d	320	.get_next_id = v2_get_next_id,
1da177e4 LT	321	};
1da177e4 LT	322
498c6015	323	static struct quota_format_type v2r0_quota_format = {
1da177e4 LT	324	.qf_fmt_id = QFMT_VFS_V0,
	325	.qf_ops = &v2_format_ops,
	326	.qf_owner = THIS_MODULE
	327	};
	328
498c6015 JK	329	static struct quota_format_type v2r1_quota_format = {
	330	.qf_fmt_id = QFMT_VFS_V1,
	331	.qf_ops = &v2_format_ops,
	332	.qf_owner = THIS_MODULE
	333	};
	334
1da177e4 LT	335	static int __init init_v2_quota_format(void)
1da177e4 LT	336	{
498c6015 JK	337	int ret;
	338
	339	ret = register_quota_format(&v2r0_quota_format);
	340	if (ret)
	341	return ret;
	342	return register_quota_format(&v2r1_quota_format);
1da177e4 LT	343	}
	344
	345	static void __exit exit_v2_quota_format(void)
	346	{
498c6015 JK	347	unregister_quota_format(&v2r0_quota_format);
498c6015 JK	348	unregister_quota_format(&v2r1_quota_format);
1da177e4 LT	349	}
	350
	351	module_init(init_v2_quota_format);
	352	module_exit(exit_v2_quota_format);