[net-next-2.6.git] / fs / quota_v1.c

#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/quota.h>
#include <linux/quotaops.h>
#include <linux/dqblk_v1.h>
#include <linux/quotaio_v1.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>

#include <asm/byteorder.h>

MODULE_AUTHOR("Jan Kara");
MODULE_DESCRIPTION("Old quota format support");
MODULE_LICENSE("GPL");

#define QUOTABLOCK_BITS 10
#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)

static inline qsize_t v1_stoqb(qsize_t space)
{
	return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
}

static inline qsize_t v1_qbtos(qsize_t blocks)
{
	return blocks << QUOTABLOCK_BITS;
}

static void v1_disk2mem_dqblk(struct mem_dqblk *m, struct v1_disk_dqblk *d)
{
	m->dqb_ihardlimit = d->dqb_ihardlimit;
	m->dqb_isoftlimit = d->dqb_isoftlimit;
	m->dqb_curinodes = d->dqb_curinodes;
	m->dqb_bhardlimit = v1_qbtos(d->dqb_bhardlimit);
	m->dqb_bsoftlimit = v1_qbtos(d->dqb_bsoftlimit);
	m->dqb_curspace = v1_qbtos(d->dqb_curblocks);
	m->dqb_itime = d->dqb_itime;
	m->dqb_btime = d->dqb_btime;
}

static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m)
{
	d->dqb_ihardlimit = m->dqb_ihardlimit;
	d->dqb_isoftlimit = m->dqb_isoftlimit;
	d->dqb_curinodes = m->dqb_curinodes;
	d->dqb_bhardlimit = v1_stoqb(m->dqb_bhardlimit);
	d->dqb_bsoftlimit = v1_stoqb(m->dqb_bsoftlimit);
	d->dqb_curblocks = v1_stoqb(m->dqb_curspace);
	d->dqb_itime = m->dqb_itime;
	d->dqb_btime = m->dqb_btime;
}

static int v1_read_dqblk(struct dquot *dquot)
{
	int type = dquot->dq_type;
	struct v1_disk_dqblk dqblk;

	if (!sb_dqopt(dquot->dq_sb)->files[type])
		return -EINVAL;

	/* Set structure to 0s in case read fails/is after end of file */
	memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
	dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));

	v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk);
	if (dquot->dq_dqb.dqb_bhardlimit == 0 && dquot->dq_dqb.dqb_bsoftlimit == 0 &&
	    dquot->dq_dqb.dqb_ihardlimit == 0 && dquot->dq_dqb.dqb_isoftlimit == 0)
		set_bit(DQ_FAKE_B, &dquot->dq_flags);
	dqstats.reads++;

	return 0;
}

static int v1_commit_dqblk(struct dquot *dquot)
{
	short type = dquot->dq_type;
	ssize_t ret;
	struct v1_disk_dqblk dqblk;

	v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);
	if (dquot->dq_id == 0) {
		dqblk.dqb_btime = sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace;
		dqblk.dqb_itime = sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace;
	}
	ret = 0;
	if (sb_dqopt(dquot->dq_sb)->files[type])
		ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type, (char *)&dqblk,
					sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));
	if (ret != sizeof(struct v1_disk_dqblk)) {
		printk(KERN_WARNING "VFS: dquota write failed on dev %s\n",
			dquot->dq_sb->s_id);
		if (ret >= 0)
			ret = -EIO;
		goto out;
	}
	ret = 0;

out:
	dqstats.writes++;

	return ret;
}

/* Magics of new quota format */
#define V2_INITQMAGICS {\
	0xd9c01f11,     /* USRQUOTA */\
	0xd9c01927      /* GRPQUOTA */\
}

/* Header of new quota format */
struct v2_disk_dqheader {
	__le32 dqh_magic;        /* Magic number identifying file */
	__le32 dqh_version;      /* File version */
};

static int v1_check_quota_file(struct super_block *sb, int type)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
	ulong blocks;
	size_t off; 
	struct v2_disk_dqheader dqhead;
	ssize_t size;
	loff_t isize;
	static const uint quota_magics[] = V2_INITQMAGICS;

	isize = i_size_read(inode);
	if (!isize)
		return 0;
	blocks = isize >> BLOCK_SIZE_BITS;
	off = isize & (BLOCK_SIZE - 1);
	if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) % sizeof(struct v1_disk_dqblk))
		return 0;
	/* Doublecheck whether we didn't get file with new format - with old quotactl() this could happen */
	size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);
	if (size != sizeof(struct v2_disk_dqheader))
		return 1;	/* Probably not new format */
	if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type])
		return 1;	/* Definitely not new format */
	printk(KERN_INFO "VFS: %s: Refusing to turn on old quota format on given file. It probably contains newer quota format.\n", sb->s_id);
        return 0;		/* Seems like a new format file -> refuse it */
}

static int v1_read_file_info(struct super_block *sb, int type)
{
	struct quota_info *dqopt = sb_dqopt(sb);
	struct v1_disk_dqblk dqblk;
	int ret;

	if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {
		if (ret >= 0)
			ret = -EIO;
		goto out;
	}
	ret = 0;
	/* limits are stored as unsigned 32-bit data */
	dqopt->info[type].dqi_maxblimit = 0xffffffff;
	dqopt->info[type].dqi_maxilimit = 0xffffffff;
	dqopt->info[type].dqi_igrace = dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;
	dqopt->info[type].dqi_bgrace = dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;
out:
	return ret;
}

static int v1_write_file_info(struct super_block *sb, int type)
{
	struct quota_info *dqopt = sb_dqopt(sb);
	struct v1_disk_dqblk dqblk;
	int ret;

	dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY;
	if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk,
	    sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {
		if (ret >= 0)
			ret = -EIO;
		goto out;
	}
	dqblk.dqb_itime = dqopt->info[type].dqi_igrace;
	dqblk.dqb_btime = dqopt->info[type].dqi_bgrace;
	ret = sb->s_op->quota_write(sb, type, (char *)&dqblk,
	      sizeof(struct v1_disk_dqblk), v1_dqoff(0));
	if (ret == sizeof(struct v1_disk_dqblk))
		ret = 0;
	else if (ret > 0)
		ret = -EIO;
out:
	return ret;
}

static struct quota_format_ops v1_format_ops = {
	.check_quota_file	= v1_check_quota_file,
	.read_file_info		= v1_read_file_info,
	.write_file_info	= v1_write_file_info,
	.free_file_info		= NULL,
	.read_dqblk		= v1_read_dqblk,
	.commit_dqblk		= v1_commit_dqblk,
};

static struct quota_format_type v1_quota_format = {
	.qf_fmt_id	= QFMT_VFS_OLD,
	.qf_ops		= &v1_format_ops,
	.qf_owner	= THIS_MODULE
};

static int __init init_v1_quota_format(void)
{
        return register_quota_format(&v1_quota_format);
}

static void __exit exit_v1_quota_format(void)
{
        unregister_quota_format(&v1_quota_format);
}

module_init(init_v1_quota_format);
module_exit(exit_v1_quota_format);
Commit	Line	Data
1da177e4 LT	1	#include <linux/errno.h>
	2	#include <linux/fs.h>
	3	#include <linux/quota.h>
74abb989	4	#include <linux/quotaops.h>
1da177e4 LT	5	#include <linux/dqblk_v1.h>
	6	#include <linux/quotaio_v1.h>
	7	#include <linux/kernel.h>
	8	#include <linux/init.h>
	9	#include <linux/module.h>
	10
	11	#include <asm/byteorder.h>
	12
	13	MODULE_AUTHOR("Jan Kara");
	14	MODULE_DESCRIPTION("Old quota format support");
	15	MODULE_LICENSE("GPL");
	16
12095460 JK	17	#define QUOTABLOCK_BITS 10
	18	#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
	19
	20	static inline qsize_t v1_stoqb(qsize_t space)
	21	{
	22	return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
	23	}
	24
	25	static inline qsize_t v1_qbtos(qsize_t blocks)
	26	{
	27	return blocks << QUOTABLOCK_BITS;
	28	}
	29
1da177e4 LT	30	static void v1_disk2mem_dqblk(struct mem_dqblk m, struct v1_disk_dqblk d)
	31	{
	32	m->dqb_ihardlimit = d->dqb_ihardlimit;
	33	m->dqb_isoftlimit = d->dqb_isoftlimit;
	34	m->dqb_curinodes = d->dqb_curinodes;
12095460 JK	35	m->dqb_bhardlimit = v1_qbtos(d->dqb_bhardlimit);
	36	m->dqb_bsoftlimit = v1_qbtos(d->dqb_bsoftlimit);
	37	m->dqb_curspace = v1_qbtos(d->dqb_curblocks);
1da177e4 LT	38	m->dqb_itime = d->dqb_itime;
	39	m->dqb_btime = d->dqb_btime;
	40	}
	41
	42	static void v1_mem2disk_dqblk(struct v1_disk_dqblk d, struct mem_dqblk m)
	43	{
	44	d->dqb_ihardlimit = m->dqb_ihardlimit;
	45	d->dqb_isoftlimit = m->dqb_isoftlimit;
	46	d->dqb_curinodes = m->dqb_curinodes;
12095460 JK	47	d->dqb_bhardlimit = v1_stoqb(m->dqb_bhardlimit);
	48	d->dqb_bsoftlimit = v1_stoqb(m->dqb_bsoftlimit);
	49	d->dqb_curblocks = v1_stoqb(m->dqb_curspace);
1da177e4 LT	50	d->dqb_itime = m->dqb_itime;
	51	d->dqb_btime = m->dqb_btime;
	52	}
	53
	54	static int v1_read_dqblk(struct dquot *dquot)
	55	{
	56	int type = dquot->dq_type;
	57	struct v1_disk_dqblk dqblk;
	58
	59	if (!sb_dqopt(dquot->dq_sb)->files[type])
	60	return -EINVAL;
	61
	62	/* Set structure to 0s in case read fails/is after end of file */
	63	memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
	64	dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));
	65
	66	v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk);
	67	if (dquot->dq_dqb.dqb_bhardlimit == 0 && dquot->dq_dqb.dqb_bsoftlimit == 0 &&
	68	dquot->dq_dqb.dqb_ihardlimit == 0 && dquot->dq_dqb.dqb_isoftlimit == 0)
	69	set_bit(DQ_FAKE_B, &dquot->dq_flags);
	70	dqstats.reads++;
	71
	72	return 0;
	73	}
	74
	75	static int v1_commit_dqblk(struct dquot *dquot)
	76	{
	77	short type = dquot->dq_type;
	78	ssize_t ret;
	79	struct v1_disk_dqblk dqblk;
	80
	81	v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);
	82	if (dquot->dq_id == 0) {
	83	dqblk.dqb_btime = sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace;
	84	dqblk.dqb_itime = sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace;
	85	}
	86	ret = 0;
	87	if (sb_dqopt(dquot->dq_sb)->files[type])
	88	ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type, (char *)&dqblk,
	89	sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));
	90	if (ret != sizeof(struct v1_disk_dqblk)) {
	91	printk(KERN_WARNING "VFS: dquota write failed on dev %s\n",
	92	dquot->dq_sb->s_id);
	93	if (ret >= 0)
	94	ret = -EIO;
	95	goto out;
	96	}
	97	ret = 0;
	98
	99	out:
	100	dqstats.writes++;
	101
	102	return ret;
	103	}
	104
	105	/* Magics of new quota format */
	106	#define V2_INITQMAGICS {\
	107	0xd9c01f11, /* USRQUOTA */\
	108	0xd9c01927 /* GRPQUOTA */\
	109	}
	110
	111	/* Header of new quota format */
	112	struct v2_disk_dqheader {
	113	__le32 dqh_magic; /* Magic number identifying file */
114	__le32 dqh_version; /* File version */
115	};
116
117	static int v1_check_quota_file(struct super_block *sb, int type)
118	{
119	struct inode *inode = sb_dqopt(sb)->files[type];
120	ulong blocks;
121	size_t off;
122	struct v2_disk_dqheader dqhead;
123	ssize_t size;
124	loff_t isize;
125	static const uint quota_magics[] = V2_INITQMAGICS;
126
127	isize = i_size_read(inode);
128	if (!isize)
129	return 0;
130	blocks = isize >> BLOCK_SIZE_BITS;
131	off = isize & (BLOCK_SIZE - 1);
132	if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) % sizeof(struct v1_disk_dqblk))
133	return 0;
134	/* Doublecheck whether we didn't get file with new format - with old quotactl() this could happen */
135	size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);
136	if (size != sizeof(struct v2_disk_dqheader))
137	return 1; /* Probably not new format */
138	if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type])
139	return 1; /* Definitely not new format */
140	printk(KERN_INFO "VFS: %s: Refusing to turn on old quota format on given file. It probably contains newer quota format.\n", sb->s_id);
141	return 0; /* Seems like a new format file -> refuse it */
142	}
143
144	static int v1_read_file_info(struct super_block *sb, int type)
145	{
146	struct quota_info *dqopt = sb_dqopt(sb);
147	struct v1_disk_dqblk dqblk;
148	int ret;
149
150	if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {
151	if (ret >= 0)
152	ret = -EIO;
153	goto out;
154	}
155	ret = 0;
338bf9af AP	156	/* limits are stored as unsigned 32-bit data */
	157	dqopt->info[type].dqi_maxblimit = 0xffffffff;
	158	dqopt->info[type].dqi_maxilimit = 0xffffffff;
1da177e4 LT	159	dqopt->info[type].dqi_igrace = dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;
	160	dqopt->info[type].dqi_bgrace = dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;
	161	out:
	162	return ret;
	163	}
	164
	165	static int v1_write_file_info(struct super_block *sb, int type)
	166	{
	167	struct quota_info *dqopt = sb_dqopt(sb);
	168	struct v1_disk_dqblk dqblk;
	169	int ret;
	170
	171	dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY;
	172	if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk,
	173	sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {
	174	if (ret >= 0)
	175	ret = -EIO;
	176	goto out;
	177	}
	178	dqblk.dqb_itime = dqopt->info[type].dqi_igrace;
	179	dqblk.dqb_btime = dqopt->info[type].dqi_bgrace;
	180	ret = sb->s_op->quota_write(sb, type, (char *)&dqblk,
	181	sizeof(struct v1_disk_dqblk), v1_dqoff(0));
	182	if (ret == sizeof(struct v1_disk_dqblk))
	183	ret = 0;
	184	else if (ret > 0)
	185	ret = -EIO;
	186	out:
	187	return ret;
	188	}
	189
	190	static struct quota_format_ops v1_format_ops = {
	191	.check_quota_file = v1_check_quota_file,
	192	.read_file_info = v1_read_file_info,
	193	.write_file_info = v1_write_file_info,
	194	.free_file_info = NULL,
	195	.read_dqblk = v1_read_dqblk,
	196	.commit_dqblk = v1_commit_dqblk,
	197	};
	198
	199	static struct quota_format_type v1_quota_format = {
	200	.qf_fmt_id = QFMT_VFS_OLD,
	201	.qf_ops = &v1_format_ops,
	202	.qf_owner = THIS_MODULE
	203	};
	204
	205	static int __init init_v1_quota_format(void)
	206	{
	207	return register_quota_format(&v1_quota_format);
	208	}
	209
	210	static void __exit exit_v1_quota_format(void)
	211	{
	212	unregister_quota_format(&v1_quota_format);
	213	}
	214
	215	module_init(init_v1_quota_format);
	216	module_exit(exit_v1_quota_format);
	217