[linux-block.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");

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 = -EUCLEAN;
	/* Some sanity checks of the read headers... */
	if ((loff_t)qinfo->dqi_blocks << qinfo->dqi_blocksize_bits >
	    i_size_read(sb_dqopt(sb)->files[type])) {
		quota_error(sb, "Number of blocks too big for quota file size (%llu > %llu).",
		    (loff_t)qinfo->dqi_blocks << qinfo->dqi_blocksize_bits,
		    i_size_read(sb_dqopt(sb)->files[type]));
		goto out_free;
	}
	if (qinfo->dqi_free_blk >= qinfo->dqi_blocks) {
		quota_error(sb, "Free block number too big (%u >= %u).",
			    qinfo->dqi_free_blk, qinfo->dqi_blocks);
		goto out_free;
	}
	if (qinfo->dqi_free_entry >= qinfo->dqi_blocks) {
		quota_error(sb, "Block with free entry too big (%u >= %u).",
			    qinfo->dqi_free_entry, qinfo->dqi_blocks);
		goto out_free;
	}
	ret = 0;
out_free:
	if (ret) {
		kfree(info->dqi_priv);
		info->dqi_priv = NULL;
	}
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));
	d->dqb_pad = 0;
	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
498c6015 JK	25	static void v2r0_mem2diskdqb(void dp, struct dquot dquot);
	26	static void v2r0_disk2memdqb(struct dquot dquot, void dp);
	27	static int v2r0_is_id(void dp, struct dquot dquot);
	28	static void v2r1_mem2diskdqb(void dp, struct dquot dquot);
	29	static void v2r1_disk2memdqb(struct dquot dquot, void dp);
	30	static int v2r1_is_id(void dp, struct dquot dquot);
	31
d1b98c23	32	static const struct qtree_fmt_operations v2r0_qtree_ops = {
498c6015 JK	33	.mem2disk_dqblk = v2r0_mem2diskdqb,
	34	.disk2mem_dqblk = v2r0_disk2memdqb,
	35	.is_id = v2r0_is_id,
	36	};
	37
d1b98c23	38	static const struct qtree_fmt_operations v2r1_qtree_ops = {
498c6015 JK	39	.mem2disk_dqblk = v2r1_mem2diskdqb,
	40	.disk2mem_dqblk = v2r1_disk2memdqb,
	41	.is_id = v2r1_is_id,
1ccd14b9	42	};
1da177e4	43
12095460 JK	44	#define QUOTABLOCK_BITS 10
	45	#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
	46
	47	static inline qsize_t v2_stoqb(qsize_t space)
	48	{
	49	return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
	50	}
	51
	52	static inline qsize_t v2_qbtos(qsize_t blocks)
	53	{
	54	return blocks << QUOTABLOCK_BITS;
	55	}
	56
498c6015 JK	57	static int v2_read_header(struct super_block *sb, int type,
	58	struct v2_disk_dqheader *dqhead)
	59	{
	60	ssize_t size;
	61
	62	size = sb->s_op->quota_read(sb, type, (char *)dqhead,
	63	sizeof(struct v2_disk_dqheader), 0);
	64	if (size != sizeof(struct v2_disk_dqheader)) {
fb5ffb0e JZ	65	quota_error(sb, "Failed header read: expected=%zd got=%zd",
fb5ffb0e JZ	66	sizeof(struct v2_disk_dqheader), size);
f98bbe37 JK	67	if (size < 0)
	68	return size;
	69	return -EIO;
498c6015	70	}
f98bbe37	71	return 0;
498c6015 JK	72	}
498c6015 JK	73
1da177e4 LT	74	/* Check whether given file is really vfsv0 quotafile */
	75	static int v2_check_quota_file(struct super_block *sb, int type)
	76	{
	77	struct v2_disk_dqheader dqhead;
1da177e4 LT	78	static const uint quota_magics[] = V2_INITQMAGICS;
1da177e4 LT	79	static const uint quota_versions[] = V2_INITQVERSIONS;
27942ef5	80
f98bbe37	81	if (v2_read_header(sb, type, &dqhead))
1da177e4	82	return 0;
1da177e4	83	if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] \|\|
498c6015	84	le32_to_cpu(dqhead.dqh_version) > quota_versions[type])
1da177e4 LT	85	return 0;
	86	return 1;
	87	}
	88
	89	/* Read information header from quota file */
	90	static int v2_read_file_info(struct super_block *sb, int type)
	91	{
	92	struct v2_disk_dqinfo dinfo;
498c6015	93	struct v2_disk_dqheader dqhead;
42fdb858 JK	94	struct quota_info *dqopt = sb_dqopt(sb);
42fdb858 JK	95	struct mem_dqinfo *info = &dqopt->info[type];
e3d4d56b	96	struct qtree_mem_dqinfo *qinfo;
1da177e4	97	ssize_t size;
498c6015	98	unsigned int version;
42fdb858	99	int ret;
498c6015	100
42fdb858	101	down_read(&dqopt->dqio_sem);
f98bbe37 JK	102	ret = v2_read_header(sb, type, &dqhead);
f98bbe37 JK	103	if (ret < 0)
42fdb858	104	goto out;
498c6015	105	version = le32_to_cpu(dqhead.dqh_version);
869835df	106	if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) \|\|
42fdb858	107	(info->dqi_fmt_id == QFMT_VFS_V1 && version != 1)) {
cb8d01b4	108	ret = -EINVAL;
42fdb858 JK	109	goto out;
42fdb858 JK	110	}
1da177e4 LT	111
	112	size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
	113	sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
	114	if (size != sizeof(struct v2_disk_dqinfo)) {
fb5ffb0e	115	quota_error(sb, "Can't read info structure");
f98bbe37 JK	116	if (size < 0)
	117	ret = size;
	118	else
	119	ret = -EIO;
42fdb858	120	goto out;
1da177e4	121	}
e3d4d56b JK	122	info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
e3d4d56b JK	123	if (!info->dqi_priv) {
42fdb858 JK	124	ret = -ENOMEM;
42fdb858 JK	125	goto out;
e3d4d56b JK	126	}
e3d4d56b JK	127	qinfo = info->dqi_priv;
498c6015 JK	128	if (version == 0) {
498c6015 JK	129	/* limits are stored as unsigned 32-bit data */
7e08da50	130	info->dqi_max_spc_limit = 0xffffffffLL << QUOTABLOCK_BITS;
b10a0819	131	info->dqi_max_ino_limit = 0xffffffff;
498c6015	132	} else {
7e08da50 JK	133	/*
	134	* Used space is stored as unsigned 64-bit value in bytes but
	135	* quota core supports only signed 64-bit values so use that
	136	* as a limit
	137	*/
	138	info->dqi_max_spc_limit = 0x7fffffffffffffffLL; /* 2^63-1 */
	139	info->dqi_max_ino_limit = 0x7fffffffffffffffLL;
498c6015	140	}
1da177e4 LT	141	info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
1da177e4 LT	142	info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
c119c5b9 JK	143	/* No flags currently supported */
c119c5b9 JK	144	info->dqi_flags = 0;
e3d4d56b JK	145	qinfo->dqi_sb = sb;
	146	qinfo->dqi_type = type;
	147	qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
	148	qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
	149	qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
	150	qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
	151	qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
	152	qinfo->dqi_qtree_depth = qtree_depth(qinfo);
498c6015 JK	153	if (version == 0) {
	154	qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk);
	155	qinfo->dqi_ops = &v2r0_qtree_ops;
	156	} else {
	157	qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk);
	158	qinfo->dqi_ops = &v2r1_qtree_ops;
	159	}
11c514a9 JK	160	ret = -EUCLEAN;
	161	/* Some sanity checks of the read headers... */
	162	if ((loff_t)qinfo->dqi_blocks << qinfo->dqi_blocksize_bits >
	163	i_size_read(sb_dqopt(sb)->files[type])) {
	164	quota_error(sb, "Number of blocks too big for quota file size (%llu > %llu).",
	165	(loff_t)qinfo->dqi_blocks << qinfo->dqi_blocksize_bits,
	166	i_size_read(sb_dqopt(sb)->files[type]));
a4db1072	167	goto out_free;
11c514a9 JK	168	}
	169	if (qinfo->dqi_free_blk >= qinfo->dqi_blocks) {
	170	quota_error(sb, "Free block number too big (%u >= %u).",
	171	qinfo->dqi_free_blk, qinfo->dqi_blocks);
a4db1072	172	goto out_free;
11c514a9 JK	173	}
	174	if (qinfo->dqi_free_entry >= qinfo->dqi_blocks) {
	175	quota_error(sb, "Block with free entry too big (%u >= %u).",
	176	qinfo->dqi_free_entry, qinfo->dqi_blocks);
a4db1072	177	goto out_free;
11c514a9	178	}
42fdb858	179	ret = 0;
a4db1072 JK	180	out_free:
	181	if (ret) {
	182	kfree(info->dqi_priv);
	183	info->dqi_priv = NULL;
	184	}
42fdb858 JK	185	out:
	186	up_read(&dqopt->dqio_sem);
	187	return ret;
1da177e4 LT	188	}
	189
	190	/* Write information header to quota file */
	191	static int v2_write_file_info(struct super_block *sb, int type)
	192	{
	193	struct v2_disk_dqinfo dinfo;
9a8ae30e JK	194	struct quota_info *dqopt = sb_dqopt(sb);
9a8ae30e JK	195	struct mem_dqinfo *info = &dqopt->info[type];
e3d4d56b	196	struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
1da177e4 LT	197	ssize_t size;
1da177e4 LT	198
9a8ae30e	199	down_write(&dqopt->dqio_sem);
1da177e4 LT	200	spin_lock(&dq_data_lock);
	201	info->dqi_flags &= ~DQF_INFO_DIRTY;
	202	dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
	203	dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
c119c5b9 JK	204	/* No flags currently supported */
c119c5b9 JK	205	dinfo.dqi_flags = cpu_to_le32(0);
1da177e4	206	spin_unlock(&dq_data_lock);
e3d4d56b JK	207	dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks);
	208	dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);
	209	dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry);
1da177e4 LT	210	size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
1da177e4 LT	211	sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
9a8ae30e	212	up_write(&dqopt->dqio_sem);
1da177e4	213	if (size != sizeof(struct v2_disk_dqinfo)) {
fb5ffb0e	214	quota_error(sb, "Can't write info structure");
1da177e4 LT	215	return -1;
	216	}
	217	return 0;
	218	}
	219
498c6015	220	static void v2r0_disk2memdqb(struct dquot dquot, void dp)
1da177e4	221	{
498c6015	222	struct v2r0_disk_dqblk *d = dp, empty;
1ccd14b9 JK	223	struct mem_dqblk *m = &dquot->dq_dqb;
1ccd14b9 JK	224
1da177e4 LT	225	m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
	226	m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
	227	m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
	228	m->dqb_itime = le64_to_cpu(d->dqb_itime);
12095460 JK	229	m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
12095460 JK	230	m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
1da177e4 LT	231	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
1da177e4 LT	232	m->dqb_btime = le64_to_cpu(d->dqb_btime);
1ccd14b9	233	/* We need to escape back all-zero structure */
498c6015	234	memset(&empty, 0, sizeof(struct v2r0_disk_dqblk));
1ccd14b9	235	empty.dqb_itime = cpu_to_le64(1);
498c6015	236	if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk)))
1ccd14b9	237	m->dqb_itime = 0;
1da177e4 LT	238	}
1da177e4 LT	239
498c6015	240	static void v2r0_mem2diskdqb(void dp, struct dquot dquot)
1da177e4	241	{
498c6015	242	struct v2r0_disk_dqblk *d = dp;
1ccd14b9 JK	243	struct mem_dqblk *m = &dquot->dq_dqb;
1ccd14b9 JK	244	struct qtree_mem_dqinfo *info =
4c376dca	245	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
1ccd14b9	246
1da177e4 LT	247	d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
	248	d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
	249	d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
	250	d->dqb_itime = cpu_to_le64(m->dqb_itime);
cf770c13 JK	251	d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit));
cf770c13 JK	252	d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit));
1da177e4 LT	253	d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
1da177e4 LT	254	d->dqb_btime = cpu_to_le64(m->dqb_btime);
4c376dca	255	d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
1ccd14b9 JK	256	if (qtree_entry_unused(info, dp))
1ccd14b9 JK	257	d->dqb_itime = cpu_to_le64(1);
1da177e4 LT	258	}
1da177e4 LT	259
498c6015 JK	260	static int v2r0_is_id(void dp, struct dquot dquot)
	261	{
	262	struct v2r0_disk_dqblk *d = dp;
	263	struct qtree_mem_dqinfo *info =
4c376dca	264	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
498c6015 JK	265
	266	if (qtree_entry_unused(info, dp))
	267	return 0;
4c376dca EB	268	return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
	269	le32_to_cpu(d->dqb_id)),
	270	dquot->dq_id);
498c6015 JK	271	}
	272
	273	static void v2r1_disk2memdqb(struct dquot dquot, void dp)
	274	{
	275	struct v2r1_disk_dqblk *d = dp, empty;
	276	struct mem_dqblk *m = &dquot->dq_dqb;
	277
	278	m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
	279	m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
	280	m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
	281	m->dqb_itime = le64_to_cpu(d->dqb_itime);
	282	m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit));
	283	m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit));
	284	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
	285	m->dqb_btime = le64_to_cpu(d->dqb_btime);
	286	/* We need to escape back all-zero structure */
	287	memset(&empty, 0, sizeof(struct v2r1_disk_dqblk));
	288	empty.dqb_itime = cpu_to_le64(1);
	289	if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk)))
	290	m->dqb_itime = 0;
	291	}
	292
	293	static void v2r1_mem2diskdqb(void dp, struct dquot dquot)
	294	{
	295	struct v2r1_disk_dqblk *d = dp;
	296	struct mem_dqblk *m = &dquot->dq_dqb;
	297	struct qtree_mem_dqinfo *info =
4c376dca	298	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
498c6015 JK	299
	300	d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
	301	d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
	302	d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
	303	d->dqb_itime = cpu_to_le64(m->dqb_itime);
	304	d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit));
	305	d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit));
	306	d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
	307	d->dqb_btime = cpu_to_le64(m->dqb_btime);
4c376dca	308	d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
3d3dc274	309	d->dqb_pad = 0;
498c6015 JK	310	if (qtree_entry_unused(info, dp))
	311	d->dqb_itime = cpu_to_le64(1);
	312	}
	313
	314	static int v2r1_is_id(void dp, struct dquot dquot)
1da177e4	315	{
498c6015	316	struct v2r1_disk_dqblk *d = dp;
1ccd14b9	317	struct qtree_mem_dqinfo *info =
4c376dca	318	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
1da177e4	319
1ccd14b9	320	if (qtree_entry_unused(info, dp))
1da177e4	321	return 0;
4c376dca EB	322	return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
	323	le32_to_cpu(d->dqb_id)),
	324	dquot->dq_id);
1da177e4 LT	325	}
1da177e4 LT	326
1ccd14b9	327	static int v2_read_dquot(struct dquot *dquot)
1da177e4	328	{
e342e38d JK	329	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
	330	int ret;
	331
	332	down_read(&dqopt->dqio_sem);
	333	ret = qtree_read_dquot(
	334	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
	335	dquot);
	336	up_read(&dqopt->dqio_sem);
	337	return ret;
1da177e4 LT	338	}
1da177e4 LT	339
1da177e4 LT	340	static int v2_write_dquot(struct dquot *dquot)
1da177e4 LT	341	{
8fc32c2b JK	342	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
8fc32c2b JK	343	int ret;
d2faa415 JK	344	bool alloc = false;
	345
	346	/*
	347	* If space for dquot is already allocated, we don't need any
	348	* protection as we'll only overwrite the place of dquot. We are
	349	* still protected by concurrent writes of the same dquot by
	350	* dquot->dq_lock.
	351	*/
	352	if (!dquot->dq_off) {
	353	alloc = true;
	354	down_write(&dqopt->dqio_sem);
4c6bb696 JK	355	} else {
4c6bb696 JK	356	down_read(&dqopt->dqio_sem);
d2faa415	357	}
8fc32c2b JK	358	ret = qtree_write_dquot(
	359	sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
	360	dquot);
d2faa415 JK	361	if (alloc)
d2faa415 JK	362	up_write(&dqopt->dqio_sem);
4c6bb696 JK	363	else
4c6bb696 JK	364	up_read(&dqopt->dqio_sem);
8fc32c2b	365	return ret;
1da177e4 LT	366	}
1da177e4 LT	367
1da177e4 LT	368	static int v2_release_dquot(struct dquot *dquot)
1da177e4 LT	369	{
b9a1a7f4 JK	370	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
	371	int ret;
	372
	373	down_write(&dqopt->dqio_sem);
	374	ret = qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
	375	up_write(&dqopt->dqio_sem);
	376
	377	return ret;
e3d4d56b JK	378	}
	379
	380	static int v2_free_file_info(struct super_block *sb, int type)
	381	{
	382	kfree(sb_dqinfo(sb, type)->dqi_priv);
	383	return 0;
1da177e4 LT	384	}
1da177e4 LT	385
0066373d JK	386	static int v2_get_next_id(struct super_block sb, struct kqid qid)
0066373d JK	387	{
f14618c6 JK	388	struct quota_info *dqopt = sb_dqopt(sb);
	389	int ret;
	390
	391	down_read(&dqopt->dqio_sem);
	392	ret = qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid);
	393	up_read(&dqopt->dqio_sem);
	394	return ret;
0066373d JK	395	}
0066373d JK	396
1472da5f	397	static const struct quota_format_ops v2_format_ops = {
1da177e4 LT	398	.check_quota_file = v2_check_quota_file,
	399	.read_file_info = v2_read_file_info,
	400	.write_file_info = v2_write_file_info,
e3d4d56b	401	.free_file_info = v2_free_file_info,
1da177e4 LT	402	.read_dqblk = v2_read_dquot,
	403	.commit_dqblk = v2_write_dquot,
	404	.release_dqblk = v2_release_dquot,
0066373d	405	.get_next_id = v2_get_next_id,
1da177e4 LT	406	};
1da177e4 LT	407
498c6015	408	static struct quota_format_type v2r0_quota_format = {
1da177e4 LT	409	.qf_fmt_id = QFMT_VFS_V0,
	410	.qf_ops = &v2_format_ops,
	411	.qf_owner = THIS_MODULE
	412	};
	413
498c6015 JK	414	static struct quota_format_type v2r1_quota_format = {
	415	.qf_fmt_id = QFMT_VFS_V1,
	416	.qf_ops = &v2_format_ops,
	417	.qf_owner = THIS_MODULE
	418	};
	419
1da177e4 LT	420	static int __init init_v2_quota_format(void)
1da177e4 LT	421	{
498c6015 JK	422	int ret;
	423
	424	ret = register_quota_format(&v2r0_quota_format);
	425	if (ret)
	426	return ret;
	427	return register_quota_format(&v2r1_quota_format);
1da177e4 LT	428	}
	429
	430	static void __exit exit_v2_quota_format(void)
	431	{
498c6015 JK	432	unregister_quota_format(&v2r0_quota_format);
498c6015 JK	433	unregister_quota_format(&v2r1_quota_format);
1da177e4 LT	434	}
	435
	436	module_init(init_v2_quota_format);
	437	module_exit(exit_v2_quota_format);