[thirdparty/linux.git] / fs / quota / quota_v2.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *	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
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* vfsv0 quota IO operations on file
	4	*/
	5
	6	#include <linux/errno.h>
	7	#include <linux/fs.h>
	8	#include <linux/mount.h>
	9	#include <linux/dqblk_v2.h>
1da177e4 LT	10	#include <linux/kernel.h>
	11	#include <linux/init.h>
	12	#include <linux/module.h>
	13	#include <linux/slab.h>
74abb989	14	#include <linux/quotaops.h>
1da177e4 LT	15
	16	#include <asm/byteorder.h>
	17
1ccd14b9	18	#include "quota_tree.h"
cf770c13 JK	19	#include "quotaio_v2.h"
cf770c13 JK	20
1da177e4 LT	21	MODULE_AUTHOR("Jan Kara");
	22	MODULE_DESCRIPTION("Quota format v2 support");
	23	MODULE_LICENSE("GPL");
	24
	25	#define __QUOTA_V2_PARANOIA
	26
498c6015 JK	27	static void v2r0_mem2diskdqb(void dp, struct dquot dquot);
	28	static void v2r0_disk2memdqb(struct dquot dquot, void dp);
	29	static int v2r0_is_id(void dp, struct dquot dquot);
	30	static void v2r1_mem2diskdqb(void dp, struct dquot dquot);
	31	static void v2r1_disk2memdqb(struct dquot dquot, void dp);
	32	static int v2r1_is_id(void dp, struct dquot dquot);
	33
d1b98c23	34	static const struct qtree_fmt_operations v2r0_qtree_ops = {
498c6015 JK	35	.mem2disk_dqblk = v2r0_mem2diskdqb,
	36	.disk2mem_dqblk = v2r0_disk2memdqb,
	37	.is_id = v2r0_is_id,
	38	};
	39
d1b98c23	40	static const struct qtree_fmt_operations v2r1_qtree_ops = {
498c6015 JK	41	.mem2disk_dqblk = v2r1_mem2diskdqb,
	42	.disk2mem_dqblk = v2r1_disk2memdqb,
	43	.is_id = v2r1_is_id,
1ccd14b9	44	};
1da177e4	45
12095460 JK	46	#define QUOTABLOCK_BITS 10
	47	#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
	48
	49	static inline qsize_t v2_stoqb(qsize_t space)
	50	{
	51	return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
	52	}
	53
	54	static inline qsize_t v2_qbtos(qsize_t blocks)
	55	{
	56	return blocks << QUOTABLOCK_BITS;
	57	}
	58
498c6015 JK	59	static int v2_read_header(struct super_block *sb, int type,
	60	struct v2_disk_dqheader *dqhead)
	61	{
	62	ssize_t size;
	63
	64	size = sb->s_op->quota_read(sb, type, (char *)dqhead,
	65	sizeof(struct v2_disk_dqheader), 0);
	66	if (size != sizeof(struct v2_disk_dqheader)) {
fb5ffb0e JZ	67	quota_error(sb, "Failed header read: expected=%zd got=%zd",
fb5ffb0e JZ	68	sizeof(struct v2_disk_dqheader), size);
f98bbe37 JK	69	if (size < 0)
	70	return size;
	71	return -EIO;
498c6015	72	}
f98bbe37	73	return 0;
498c6015 JK	74	}
498c6015 JK	75
1da177e4 LT	76	/* Check whether given file is really vfsv0 quotafile */
	77	static int v2_check_quota_file(struct super_block *sb, int type)
	78	{
	79	struct v2_disk_dqheader dqhead;
1da177e4 LT	80	static const uint quota_magics[] = V2_INITQMAGICS;
1da177e4 LT	81	static const uint quota_versions[] = V2_INITQVERSIONS;
27942ef5	82
f98bbe37	83	if (v2_read_header(sb, type, &dqhead))
1da177e4	84	return 0;
1da177e4	85	if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] \|\|
498c6015	86	le32_to_cpu(dqhead.dqh_version) > quota_versions[type])
1da177e4 LT	87	return 0;
	88	return 1;
	89	}
	90
	91	/* Read information header from quota file */
	92	static int v2_read_file_info(struct super_block *sb, int type)
	93	{
	94	struct v2_disk_dqinfo dinfo;
498c6015	95	struct v2_disk_dqheader dqhead;
42fdb858 JK	96	struct quota_info *dqopt = sb_dqopt(sb);
42fdb858 JK	97	struct mem_dqinfo *info = &dqopt->info[type];
e3d4d56b	98	struct qtree_mem_dqinfo *qinfo;
1da177e4	99	ssize_t size;
498c6015	100	unsigned int version;
42fdb858	101	int ret;
498c6015	102
42fdb858	103	down_read(&dqopt->dqio_sem);
f98bbe37 JK	104	ret = v2_read_header(sb, type, &dqhead);
f98bbe37 JK	105	if (ret < 0)
42fdb858	106	goto out;
498c6015	107	version = le32_to_cpu(dqhead.dqh_version);
869835df	108	if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) \|\|
42fdb858	109	(info->dqi_fmt_id == QFMT_VFS_V1 && version != 1)) {
cb8d01b4	110	ret = -EINVAL;
42fdb858 JK	111	goto out;
42fdb858 JK	112	}
1da177e4 LT	113
	114	size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
	115	sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
	116	if (size != sizeof(struct v2_disk_dqinfo)) {
fb5ffb0e	117	quota_error(sb, "Can't read info structure");
f98bbe37 JK	118	if (size < 0)
	119	ret = size;
	120	else
	121	ret = -EIO;
42fdb858	122	goto out;
1da177e4	123	}
e3d4d56b JK	124	info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
e3d4d56b JK	125	if (!info->dqi_priv) {
42fdb858 JK	126	ret = -ENOMEM;
42fdb858 JK	127	goto out;
e3d4d56b JK	128	}
e3d4d56b JK	129	qinfo = info->dqi_priv;
498c6015 JK	130	if (version == 0) {
498c6015 JK	131	/* limits are stored as unsigned 32-bit data */
7e08da50	132	info->dqi_max_spc_limit = 0xffffffffLL << QUOTABLOCK_BITS;
b10a0819	133	info->dqi_max_ino_limit = 0xffffffff;
498c6015	134	} else {
7e08da50 JK	135	/*
	136	* Used space is stored as unsigned 64-bit value in bytes but
	137	* quota core supports only signed 64-bit values so use that
	138	* as a limit
	139	*/
	140	info->dqi_max_spc_limit = 0x7fffffffffffffffLL; /* 2^63-1 */
	141	info->dqi_max_ino_limit = 0x7fffffffffffffffLL;
498c6015	142	}
1da177e4 LT	143	info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
1da177e4 LT	144	info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
c119c5b9 JK	145	/* No flags currently supported */
c119c5b9 JK	146	info->dqi_flags = 0;
e3d4d56b JK	147	qinfo->dqi_sb = sb;
	148	qinfo->dqi_type = type;
	149	qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
	150	qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
	151	qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
	152	qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
	153	qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
	154	qinfo->dqi_qtree_depth = qtree_depth(qinfo);
498c6015 JK	155	if (version == 0) {
	156	qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk);
	157	qinfo->dqi_ops = &v2r0_qtree_ops;
	158	} else {
	159	qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk);
	160	qinfo->dqi_ops = &v2r1_qtree_ops;
	161	}
42fdb858 JK	162	ret = 0;
	163	out:
	164	up_read(&dqopt->dqio_sem);
	165	return ret;
1da177e4 LT	166	}
	167
	168	/* Write information header to quota file */
	169	static int v2_write_file_info(struct super_block *sb, int type)
	170	{
	171	struct v2_disk_dqinfo dinfo;
9a8ae30e JK	172	struct quota_info *dqopt = sb_dqopt(sb);
9a8ae30e JK	173	struct mem_dqinfo *info = &dqopt->info[type];
e3d4d56b	174	struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
1da177e4 LT	175	ssize_t size;
1da177e4 LT	176
9a8ae30e	177	down_write(&dqopt->dqio_sem);
1da177e4 LT	178	spin_lock(&dq_data_lock);
	179	info->dqi_flags &= ~DQF_INFO_DIRTY;
	180	dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
	181	dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
c119c5b9 JK	182	/* No flags currently supported */
c119c5b9 JK	183	dinfo.dqi_flags = cpu_to_le32(0);
1da177e4	184	spin_unlock(&dq_data_lock);
e3d4d56b JK	185	dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks);
	186	dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);
	187	dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry);
1da177e4 LT	188	size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
1da177e4 LT	189	sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
9a8ae30e	190	up_write(&dqopt->dqio_sem);
1da177e4	191	if (size != sizeof(struct v2_disk_dqinfo)) {
fb5ffb0e	192	quota_error(sb, "Can't write info structure");
1da177e4 LT	193	return -1;
	194	}
	195	return 0;
	196	}
	197
498c6015	198	static void v2r0_disk2memdqb(struct dquot dquot, void dp)
1da177e4	199	{
498c6015	200	struct v2r0_disk_dqblk *d = dp, empty;
1ccd14b9 JK	201	struct mem_dqblk *m = &dquot->dq_dqb;
1ccd14b9 JK	202
1da177e4 LT	203	m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
	204	m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
	205	m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
	206	m->dqb_itime = le64_to_cpu(d->dqb_itime);
12095460 JK	207	m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
12095460 JK	208	m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
1da177e4 LT	209	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
1da177e4 LT	210	m->dqb_btime = le64_to_cpu(d->dqb_btime);
1ccd14b9	211	/* We need to escape back all-zero structure */
498c6015	212	memset(&empty, 0, sizeof(struct v2r0_disk_dqblk));
1ccd14b9	213	empty.dqb_itime = cpu_to_le64(1);
498c6015	214	if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk)))
1ccd14b9	215	m->dqb_itime = 0;
1da177e4 LT	216	}
1da177e4 LT	217
498c6015	218	static void v2r0_mem2diskdqb(void dp, struct dquot dquot)
1da177e4	219	{
498c6015	220	struct v2r0_disk_dqblk *d = dp;
1ccd14b9 JK	221	struct mem_dqblk *m = &dquot->dq_dqb;
1ccd14b9 JK	222	struct qtree_mem_dqinfo *info =
4c376dca	223	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
1ccd14b9	224
1da177e4 LT	225	d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
	226	d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
	227	d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
	228	d->dqb_itime = cpu_to_le64(m->dqb_itime);
cf770c13 JK	229	d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit));
cf770c13 JK	230	d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit));
1da177e4 LT	231	d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
1da177e4 LT	232	d->dqb_btime = cpu_to_le64(m->dqb_btime);
4c376dca	233	d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
1ccd14b9 JK	234	if (qtree_entry_unused(info, dp))
1ccd14b9 JK	235	d->dqb_itime = cpu_to_le64(1);
1da177e4 LT	236	}
1da177e4 LT	237
498c6015 JK	238	static int v2r0_is_id(void dp, struct dquot dquot)
	239	{
	240	struct v2r0_disk_dqblk *d = dp;
	241	struct qtree_mem_dqinfo *info =
4c376dca	242	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
498c6015 JK	243
	244	if (qtree_entry_unused(info, dp))
	245	return 0;
4c376dca EB	246	return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
	247	le32_to_cpu(d->dqb_id)),
	248	dquot->dq_id);
498c6015 JK	249	}
	250
	251	static void v2r1_disk2memdqb(struct dquot dquot, void dp)
	252	{
	253	struct v2r1_disk_dqblk *d = dp, empty;
	254	struct mem_dqblk *m = &dquot->dq_dqb;
	255
	256	m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
	257	m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
	258	m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
	259	m->dqb_itime = le64_to_cpu(d->dqb_itime);
	260	m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit));
	261	m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit));
	262	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
	263	m->dqb_btime = le64_to_cpu(d->dqb_btime);
	264	/* We need to escape back all-zero structure */
	265	memset(&empty, 0, sizeof(struct v2r1_disk_dqblk));
	266	empty.dqb_itime = cpu_to_le64(1);
	267	if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk)))
	268	m->dqb_itime = 0;
	269	}
	270
	271	static void v2r1_mem2diskdqb(void dp, struct dquot dquot)
	272	{
	273	struct v2r1_disk_dqblk *d = dp;
	274	struct mem_dqblk *m = &dquot->dq_dqb;
	275	struct qtree_mem_dqinfo *info =
4c376dca	276	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
498c6015 JK	277
	278	d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
	279	d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
	280	d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
	281	d->dqb_itime = cpu_to_le64(m->dqb_itime);
	282	d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit));
	283	d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit));
	284	d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
	285	d->dqb_btime = cpu_to_le64(m->dqb_btime);
4c376dca	286	d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
498c6015 JK	287	if (qtree_entry_unused(info, dp))
	288	d->dqb_itime = cpu_to_le64(1);
	289	}
	290
	291	static int v2r1_is_id(void dp, struct dquot dquot)
1da177e4	292	{
498c6015	293	struct v2r1_disk_dqblk *d = dp;
1ccd14b9	294	struct qtree_mem_dqinfo *info =
4c376dca	295	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
1da177e4	296
1ccd14b9	297	if (qtree_entry_unused(info, dp))
1da177e4	298	return 0;
4c376dca EB	299	return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
	300	le32_to_cpu(d->dqb_id)),
	301	dquot->dq_id);
1da177e4 LT	302	}
1da177e4 LT	303
1ccd14b9	304	static int v2_read_dquot(struct dquot *dquot)
1da177e4	305	{
e342e38d JK	306	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
	307	int ret;
	308
	309	down_read(&dqopt->dqio_sem);
	310	ret = qtree_read_dquot(
	311	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
	312	dquot);
	313	up_read(&dqopt->dqio_sem);
	314	return ret;
1da177e4 LT	315	}
1da177e4 LT	316
1da177e4 LT	317	static int v2_write_dquot(struct dquot *dquot)
1da177e4 LT	318	{
8fc32c2b JK	319	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
8fc32c2b JK	320	int ret;
d2faa415 JK	321	bool alloc = false;
	322
	323	/*
	324	* If space for dquot is already allocated, we don't need any
	325	* protection as we'll only overwrite the place of dquot. We are
	326	* still protected by concurrent writes of the same dquot by
	327	* dquot->dq_lock.
	328	*/
	329	if (!dquot->dq_off) {
	330	alloc = true;
	331	down_write(&dqopt->dqio_sem);
4c6bb696 JK	332	} else {
4c6bb696 JK	333	down_read(&dqopt->dqio_sem);
d2faa415	334	}
8fc32c2b JK	335	ret = qtree_write_dquot(
	336	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
	337	dquot);
d2faa415 JK	338	if (alloc)
d2faa415 JK	339	up_write(&dqopt->dqio_sem);
4c6bb696 JK	340	else
4c6bb696 JK	341	up_read(&dqopt->dqio_sem);
8fc32c2b	342	return ret;
1da177e4 LT	343	}
1da177e4 LT	344
1da177e4 LT	345	static int v2_release_dquot(struct dquot *dquot)
1da177e4 LT	346	{
b9a1a7f4 JK	347	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
	348	int ret;
	349
	350	down_write(&dqopt->dqio_sem);
	351	ret = qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
	352	up_write(&dqopt->dqio_sem);
	353
	354	return ret;
e3d4d56b JK	355	}
	356
	357	static int v2_free_file_info(struct super_block *sb, int type)
	358	{
	359	kfree(sb_dqinfo(sb, type)->dqi_priv);
	360	return 0;
1da177e4 LT	361	}
1da177e4 LT	362
0066373d JK	363	static int v2_get_next_id(struct super_block sb, struct kqid qid)
0066373d JK	364	{
f14618c6 JK	365	struct quota_info *dqopt = sb_dqopt(sb);
	366	int ret;
	367
	368	down_read(&dqopt->dqio_sem);
	369	ret = qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid);
	370	up_read(&dqopt->dqio_sem);
	371	return ret;
0066373d JK	372	}
0066373d JK	373
1472da5f	374	static const struct quota_format_ops v2_format_ops = {
1da177e4 LT	375	.check_quota_file = v2_check_quota_file,
	376	.read_file_info = v2_read_file_info,
	377	.write_file_info = v2_write_file_info,
e3d4d56b	378	.free_file_info = v2_free_file_info,
1da177e4 LT	379	.read_dqblk = v2_read_dquot,
	380	.commit_dqblk = v2_write_dquot,
	381	.release_dqblk = v2_release_dquot,
0066373d	382	.get_next_id = v2_get_next_id,
1da177e4 LT	383	};
1da177e4 LT	384
498c6015	385	static struct quota_format_type v2r0_quota_format = {
1da177e4 LT	386	.qf_fmt_id = QFMT_VFS_V0,
	387	.qf_ops = &v2_format_ops,
	388	.qf_owner = THIS_MODULE
	389	};
	390
498c6015 JK	391	static struct quota_format_type v2r1_quota_format = {
	392	.qf_fmt_id = QFMT_VFS_V1,
	393	.qf_ops = &v2_format_ops,
	394	.qf_owner = THIS_MODULE
	395	};
	396
1da177e4 LT	397	static int __init init_v2_quota_format(void)
1da177e4 LT	398	{
498c6015 JK	399	int ret;
	400
	401	ret = register_quota_format(&v2r0_quota_format);
	402	if (ret)
	403	return ret;
	404	return register_quota_format(&v2r1_quota_format);
1da177e4 LT	405	}
	406
	407	static void __exit exit_v2_quota_format(void)
	408	{
498c6015 JK	409	unregister_quota_format(&v2r0_quota_format);
498c6015 JK	410	unregister_quota_format(&v2r1_quota_format);
1da177e4 LT	411	}
	412
	413	module_init(init_v2_quota_format);
	414	module_exit(exit_v2_quota_format);