[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);
		if (size < 0)
			return size;
		return -EIO;
	}
	return 0;
}

/* 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 quota_info *dqopt = sb_dqopt(sb);
	struct mem_dqinfo *info = &dqopt->info[type];
	struct qtree_mem_dqinfo *qinfo;
	ssize_t size;
	unsigned int version;
	int ret;

	down_read(&dqopt->dqio_sem);
	ret = v2_read_header(sb, type, &dqhead);
	if (ret < 0)
		goto out;
	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)) {
		ret = -EINVAL;
		goto out;
	}

	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");
		if (size < 0)
			ret = size;
		else
			ret = -EIO;
		goto out;
	}
	info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
	if (!info->dqi_priv) {
		ret = -ENOMEM;
		goto out;
	}
	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;
	}
	ret = 0;
out:
	up_read(&dqopt->dqio_sem);
	return ret;
}

/* Write information header to quota file */
static int v2_write_file_info(struct super_block *sb, int type)
{
	struct v2_disk_dqinfo dinfo;
	struct quota_info *dqopt = sb_dqopt(sb);
	struct mem_dqinfo *info = &dqopt->info[type];
	struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
	ssize_t size;

	down_write(&dqopt->dqio_sem);
	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);
	up_write(&dqopt->dqio_sem);
	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)
{
	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
	int ret;

	down_read(&dqopt->dqio_sem);
	ret = qtree_read_dquot(
			sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
			dquot);
	up_read(&dqopt->dqio_sem);
	return ret;
}

static int v2_write_dquot(struct dquot *dquot)
{
	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
	int ret;
	bool alloc = false;

	/*
	 * If space for dquot is already allocated, we don't need any
	 * protection as we'll only overwrite the place of dquot. We are
	 * still protected by concurrent writes of the same dquot by
	 * dquot->dq_lock.
	 */
	if (!dquot->dq_off) {
		alloc = true;
		down_write(&dqopt->dqio_sem);
	} else {
		down_read(&dqopt->dqio_sem);
	}
	ret = qtree_write_dquot(
			sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
			dquot);
	if (alloc)
		up_write(&dqopt->dqio_sem);
	else
		up_read(&dqopt->dqio_sem);
	return ret;
}

static int v2_release_dquot(struct dquot *dquot)
{
	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
	int ret;

	down_write(&dqopt->dqio_sem);
	ret = qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
	up_write(&dqopt->dqio_sem);

	return ret;
}

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)
{
	struct quota_info *dqopt = sb_dqopt(sb);
	int ret;

	down_read(&dqopt->dqio_sem);
	ret = qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid);
	up_read(&dqopt->dqio_sem);
	return ret;
}

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);
f98bbe37 JK	68	if (size < 0)
	69	return size;
	70	return -EIO;
498c6015	71	}
f98bbe37	72	return 0;
498c6015 JK	73	}
498c6015 JK	74
1da177e4 LT	75	/* Check whether given file is really vfsv0 quotafile */
	76	static int v2_check_quota_file(struct super_block *sb, int type)
	77	{
	78	struct v2_disk_dqheader dqhead;
1da177e4 LT	79	static const uint quota_magics[] = V2_INITQMAGICS;
	80	static const uint quota_versions[] = V2_INITQVERSIONS;
	81
f98bbe37	82	if (v2_read_header(sb, type, &dqhead))
1da177e4	83	return 0;
1da177e4	84	if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] \|\|
498c6015	85	le32_to_cpu(dqhead.dqh_version) > quota_versions[type])
1da177e4 LT	86	return 0;
	87	return 1;
	88	}
	89
	90	/* Read information header from quota file */
	91	static int v2_read_file_info(struct super_block *sb, int type)
	92	{
	93	struct v2_disk_dqinfo dinfo;
498c6015	94	struct v2_disk_dqheader dqhead;
42fdb858 JK	95	struct quota_info *dqopt = sb_dqopt(sb);
42fdb858 JK	96	struct mem_dqinfo *info = &dqopt->info[type];
e3d4d56b	97	struct qtree_mem_dqinfo *qinfo;
1da177e4	98	ssize_t size;
498c6015	99	unsigned int version;
42fdb858	100	int ret;
498c6015	101
42fdb858	102	down_read(&dqopt->dqio_sem);
f98bbe37 JK	103	ret = v2_read_header(sb, type, &dqhead);
f98bbe37 JK	104	if (ret < 0)
42fdb858	105	goto out;
498c6015	106	version = le32_to_cpu(dqhead.dqh_version);
869835df	107	if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) \|\|
42fdb858	108	(info->dqi_fmt_id == QFMT_VFS_V1 && version != 1)) {
cb8d01b4	109	ret = -EINVAL;
42fdb858 JK	110	goto out;
42fdb858 JK	111	}
1da177e4 LT	112
	113	size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
	114	sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
	115	if (size != sizeof(struct v2_disk_dqinfo)) {
fb5ffb0e	116	quota_error(sb, "Can't read info structure");
f98bbe37 JK	117	if (size < 0)
	118	ret = size;
	119	else
	120	ret = -EIO;
42fdb858	121	goto out;
1da177e4	122	}
e3d4d56b JK	123	info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
e3d4d56b JK	124	if (!info->dqi_priv) {
42fdb858 JK	125	ret = -ENOMEM;
42fdb858 JK	126	goto out;
e3d4d56b JK	127	}
e3d4d56b JK	128	qinfo = info->dqi_priv;
498c6015 JK	129	if (version == 0) {
498c6015 JK	130	/* limits are stored as unsigned 32-bit data */
7e08da50	131	info->dqi_max_spc_limit = 0xffffffffLL << QUOTABLOCK_BITS;
b10a0819	132	info->dqi_max_ino_limit = 0xffffffff;
498c6015	133	} else {
7e08da50 JK	134	/*
	135	* Used space is stored as unsigned 64-bit value in bytes but
	136	* quota core supports only signed 64-bit values so use that
	137	* as a limit
	138	*/
	139	info->dqi_max_spc_limit = 0x7fffffffffffffffLL; /* 2^63-1 */
	140	info->dqi_max_ino_limit = 0x7fffffffffffffffLL;
498c6015	141	}
1da177e4 LT	142	info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
1da177e4 LT	143	info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
c119c5b9 JK	144	/* No flags currently supported */
c119c5b9 JK	145	info->dqi_flags = 0;
e3d4d56b JK	146	qinfo->dqi_sb = sb;
	147	qinfo->dqi_type = type;
	148	qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
	149	qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
	150	qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
	151	qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
	152	qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
	153	qinfo->dqi_qtree_depth = qtree_depth(qinfo);
498c6015 JK	154	if (version == 0) {
	155	qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk);
	156	qinfo->dqi_ops = &v2r0_qtree_ops;
	157	} else {
	158	qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk);
	159	qinfo->dqi_ops = &v2r1_qtree_ops;
	160	}
42fdb858 JK	161	ret = 0;
	162	out:
	163	up_read(&dqopt->dqio_sem);
	164	return ret;
1da177e4 LT	165	}
	166
	167	/* Write information header to quota file */
	168	static int v2_write_file_info(struct super_block *sb, int type)
	169	{
	170	struct v2_disk_dqinfo dinfo;
9a8ae30e JK	171	struct quota_info *dqopt = sb_dqopt(sb);
9a8ae30e JK	172	struct mem_dqinfo *info = &dqopt->info[type];
e3d4d56b	173	struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
1da177e4 LT	174	ssize_t size;
1da177e4 LT	175
9a8ae30e	176	down_write(&dqopt->dqio_sem);
1da177e4 LT	177	spin_lock(&dq_data_lock);
	178	info->dqi_flags &= ~DQF_INFO_DIRTY;
	179	dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
	180	dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
c119c5b9 JK	181	/* No flags currently supported */
c119c5b9 JK	182	dinfo.dqi_flags = cpu_to_le32(0);
1da177e4	183	spin_unlock(&dq_data_lock);
e3d4d56b JK	184	dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks);
	185	dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);
	186	dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry);
1da177e4 LT	187	size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
1da177e4 LT	188	sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
9a8ae30e	189	up_write(&dqopt->dqio_sem);
1da177e4	190	if (size != sizeof(struct v2_disk_dqinfo)) {
fb5ffb0e	191	quota_error(sb, "Can't write info structure");
1da177e4 LT	192	return -1;
	193	}
	194	return 0;
	195	}
	196
498c6015	197	static void v2r0_disk2memdqb(struct dquot dquot, void dp)
1da177e4	198	{
498c6015	199	struct v2r0_disk_dqblk *d = dp, empty;
1ccd14b9 JK	200	struct mem_dqblk *m = &dquot->dq_dqb;
1ccd14b9 JK	201
1da177e4 LT	202	m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
	203	m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
	204	m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
	205	m->dqb_itime = le64_to_cpu(d->dqb_itime);
12095460 JK	206	m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
12095460 JK	207	m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
1da177e4 LT	208	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
1da177e4 LT	209	m->dqb_btime = le64_to_cpu(d->dqb_btime);
1ccd14b9	210	/* We need to escape back all-zero structure */
498c6015	211	memset(&empty, 0, sizeof(struct v2r0_disk_dqblk));
1ccd14b9	212	empty.dqb_itime = cpu_to_le64(1);
498c6015	213	if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk)))
1ccd14b9	214	m->dqb_itime = 0;
1da177e4 LT	215	}
1da177e4 LT	216
498c6015	217	static void v2r0_mem2diskdqb(void dp, struct dquot dquot)
1da177e4	218	{
498c6015	219	struct v2r0_disk_dqblk *d = dp;
1ccd14b9 JK	220	struct mem_dqblk *m = &dquot->dq_dqb;
1ccd14b9 JK	221	struct qtree_mem_dqinfo *info =
4c376dca	222	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
1ccd14b9	223
1da177e4 LT	224	d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
	225	d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
	226	d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
	227	d->dqb_itime = cpu_to_le64(m->dqb_itime);
cf770c13 JK	228	d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit));
cf770c13 JK	229	d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit));
1da177e4 LT	230	d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
1da177e4 LT	231	d->dqb_btime = cpu_to_le64(m->dqb_btime);
4c376dca	232	d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
1ccd14b9 JK	233	if (qtree_entry_unused(info, dp))
1ccd14b9 JK	234	d->dqb_itime = cpu_to_le64(1);
1da177e4 LT	235	}
1da177e4 LT	236
498c6015 JK	237	static int v2r0_is_id(void dp, struct dquot dquot)
	238	{
	239	struct v2r0_disk_dqblk *d = dp;
	240	struct qtree_mem_dqinfo *info =
4c376dca	241	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
498c6015 JK	242
	243	if (qtree_entry_unused(info, dp))
	244	return 0;
4c376dca EB	245	return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
	246	le32_to_cpu(d->dqb_id)),
	247	dquot->dq_id);
498c6015 JK	248	}
	249
	250	static void v2r1_disk2memdqb(struct dquot dquot, void dp)
	251	{
	252	struct v2r1_disk_dqblk *d = dp, empty;
	253	struct mem_dqblk *m = &dquot->dq_dqb;
	254
	255	m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
	256	m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
	257	m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
	258	m->dqb_itime = le64_to_cpu(d->dqb_itime);
	259	m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit));
	260	m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit));
	261	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
	262	m->dqb_btime = le64_to_cpu(d->dqb_btime);
	263	/* We need to escape back all-zero structure */
	264	memset(&empty, 0, sizeof(struct v2r1_disk_dqblk));
	265	empty.dqb_itime = cpu_to_le64(1);
	266	if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk)))
	267	m->dqb_itime = 0;
	268	}
	269
	270	static void v2r1_mem2diskdqb(void dp, struct dquot dquot)
	271	{
	272	struct v2r1_disk_dqblk *d = dp;
	273	struct mem_dqblk *m = &dquot->dq_dqb;
	274	struct qtree_mem_dqinfo *info =
4c376dca	275	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
498c6015 JK	276
	277	d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
	278	d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
	279	d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
	280	d->dqb_itime = cpu_to_le64(m->dqb_itime);
	281	d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit));
	282	d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit));
	283	d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
	284	d->dqb_btime = cpu_to_le64(m->dqb_btime);
4c376dca	285	d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
498c6015 JK	286	if (qtree_entry_unused(info, dp))
	287	d->dqb_itime = cpu_to_le64(1);
	288	}
	289
	290	static int v2r1_is_id(void dp, struct dquot dquot)
1da177e4	291	{
498c6015	292	struct v2r1_disk_dqblk *d = dp;
1ccd14b9	293	struct qtree_mem_dqinfo *info =
4c376dca	294	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
1da177e4	295
1ccd14b9	296	if (qtree_entry_unused(info, dp))
1da177e4	297	return 0;
4c376dca EB	298	return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
	299	le32_to_cpu(d->dqb_id)),
	300	dquot->dq_id);
1da177e4 LT	301	}
1da177e4 LT	302
1ccd14b9	303	static int v2_read_dquot(struct dquot *dquot)
1da177e4	304	{
e342e38d JK	305	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
	306	int ret;
	307
	308	down_read(&dqopt->dqio_sem);
	309	ret = qtree_read_dquot(
	310	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
	311	dquot);
	312	up_read(&dqopt->dqio_sem);
	313	return ret;
1da177e4 LT	314	}
1da177e4 LT	315
1da177e4 LT	316	static int v2_write_dquot(struct dquot *dquot)
1da177e4 LT	317	{
8fc32c2b JK	318	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
8fc32c2b JK	319	int ret;
d2faa415 JK	320	bool alloc = false;
	321
	322	/*
	323	* If space for dquot is already allocated, we don't need any
	324	* protection as we'll only overwrite the place of dquot. We are
	325	* still protected by concurrent writes of the same dquot by
	326	* dquot->dq_lock.
	327	*/
	328	if (!dquot->dq_off) {
	329	alloc = true;
	330	down_write(&dqopt->dqio_sem);
4c6bb696 JK	331	} else {
4c6bb696 JK	332	down_read(&dqopt->dqio_sem);
d2faa415	333	}
8fc32c2b JK	334	ret = qtree_write_dquot(
	335	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
	336	dquot);
d2faa415 JK	337	if (alloc)
d2faa415 JK	338	up_write(&dqopt->dqio_sem);
4c6bb696 JK	339	else
4c6bb696 JK	340	up_read(&dqopt->dqio_sem);
8fc32c2b	341	return ret;
1da177e4 LT	342	}
1da177e4 LT	343
1da177e4 LT	344	static int v2_release_dquot(struct dquot *dquot)
1da177e4 LT	345	{
b9a1a7f4 JK	346	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
	347	int ret;
	348
	349	down_write(&dqopt->dqio_sem);
	350	ret = qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
	351	up_write(&dqopt->dqio_sem);
	352
	353	return ret;
e3d4d56b JK	354	}
	355
	356	static int v2_free_file_info(struct super_block *sb, int type)
	357	{
	358	kfree(sb_dqinfo(sb, type)->dqi_priv);
	359	return 0;
1da177e4 LT	360	}
1da177e4 LT	361
0066373d JK	362	static int v2_get_next_id(struct super_block sb, struct kqid qid)
0066373d JK	363	{
f14618c6 JK	364	struct quota_info *dqopt = sb_dqopt(sb);
	365	int ret;
	366
	367	down_read(&dqopt->dqio_sem);
	368	ret = qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid);
	369	up_read(&dqopt->dqio_sem);
	370	return ret;
0066373d JK	371	}
0066373d JK	372
1472da5f	373	static const struct quota_format_ops v2_format_ops = {
1da177e4 LT	374	.check_quota_file = v2_check_quota_file,
	375	.read_file_info = v2_read_file_info,
	376	.write_file_info = v2_write_file_info,
e3d4d56b	377	.free_file_info = v2_free_file_info,
1da177e4 LT	378	.read_dqblk = v2_read_dquot,
	379	.commit_dqblk = v2_write_dquot,
	380	.release_dqblk = v2_release_dquot,
0066373d	381	.get_next_id = v2_get_next_id,
1da177e4 LT	382	};
1da177e4 LT	383
498c6015	384	static struct quota_format_type v2r0_quota_format = {
1da177e4 LT	385	.qf_fmt_id = QFMT_VFS_V0,
	386	.qf_ops = &v2_format_ops,
	387	.qf_owner = THIS_MODULE
	388	};
	389
498c6015 JK	390	static struct quota_format_type v2r1_quota_format = {
	391	.qf_fmt_id = QFMT_VFS_V1,
	392	.qf_ops = &v2_format_ops,
	393	.qf_owner = THIS_MODULE
	394	};
	395
1da177e4 LT	396	static int __init init_v2_quota_format(void)
1da177e4 LT	397	{
498c6015 JK	398	int ret;
	399
	400	ret = register_quota_format(&v2r0_quota_format);
	401	if (ret)
	402	return ret;
	403	return register_quota_format(&v2r1_quota_format);
1da177e4 LT	404	}
	405
	406	static void __exit exit_v2_quota_format(void)
	407	{
498c6015 JK	408	unregister_quota_format(&v2r0_quota_format);
498c6015 JK	409	unregister_quota_format(&v2r1_quota_format);
1da177e4 LT	410	}
	411
	412	module_init(init_v2_quota_format);
	413	module_exit(exit_v2_quota_format);