[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / 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 v2_mem2diskdqb(void *dp, struct dquot *dquot);
static void v2_disk2memdqb(struct dquot *dquot, void *dp);
static int v2_is_id(void *dp, struct dquot *dquot);

static struct qtree_fmt_operations v2_qtree_ops = {
	.mem2disk_dqblk = v2_mem2diskdqb,
	.disk2mem_dqblk = v2_disk2memdqb,
	.is_id = v2_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;
}

/* 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;
	ssize_t size;
	static const uint quota_magics[] = V2_INITQMAGICS;
	static const uint quota_versions[] = V2_INITQVERSIONS;
 
	size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);
	if (size != sizeof(struct v2_disk_dqheader)) {
		printk("quota_v2: failed read expected=%zd got=%zd\n",
			sizeof(struct v2_disk_dqheader), size);
		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 mem_dqinfo *info = sb_dqinfo(sb, type);
	ssize_t size;

	size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
	       sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
	if (size != sizeof(struct v2_disk_dqinfo)) {
		printk(KERN_WARNING "Can't read info structure on device %s.\n",
			sb->s_id);
		return -1;
	}
	/* limits are stored as unsigned 32-bit data */
	info->dqi_maxblimit = 0xffffffff;
	info->dqi_maxilimit = 0xffffffff;
	info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
	info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
	info->dqi_flags = le32_to_cpu(dinfo.dqi_flags);
	info->u.v2_i.i.dqi_sb = sb;
	info->u.v2_i.i.dqi_type = type;
	info->u.v2_i.i.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
	info->u.v2_i.i.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
	info->u.v2_i.i.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
	info->u.v2_i.i.dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
	info->u.v2_i.i.dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
	info->u.v2_i.i.dqi_qtree_depth = qtree_depth(&info->u.v2_i.i);
	info->u.v2_i.i.dqi_entry_size = sizeof(struct v2_disk_dqblk);
	info->u.v2_i.i.dqi_ops = &v2_qtree_ops;
	return 0;
}

/* Write information header to quota file */
static int v2_write_file_info(struct super_block *sb, int type)
{
	struct v2_disk_dqinfo dinfo;
	struct mem_dqinfo *info = sb_dqinfo(sb, type);
	ssize_t size;

	spin_lock(&dq_data_lock);
	info->dqi_flags &= ~DQF_INFO_DIRTY;
	dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
	dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
	dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
	spin_unlock(&dq_data_lock);
	dinfo.dqi_blocks = cpu_to_le32(info->u.v2_i.i.dqi_blocks);
	dinfo.dqi_free_blk = cpu_to_le32(info->u.v2_i.i.dqi_free_blk);
	dinfo.dqi_free_entry = cpu_to_le32(info->u.v2_i.i.dqi_free_entry);
	size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
	       sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
	if (size != sizeof(struct v2_disk_dqinfo)) {
		printk(KERN_WARNING "Can't write info structure on device %s.\n",
			sb->s_id);
		return -1;
	}
	return 0;
}

static void v2_disk2memdqb(struct dquot *dquot, void *dp)
{
	struct v2_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 v2_disk_dqblk));
	empty.dqb_itime = cpu_to_le64(1);
	if (!memcmp(&empty, dp, sizeof(struct v2_disk_dqblk)))
		m->dqb_itime = 0;
}

static void v2_mem2diskdqb(void *dp, struct dquot *dquot)
{
	struct v2_disk_dqblk *d = dp;
	struct mem_dqblk *m = &dquot->dq_dqb;
	struct qtree_mem_dqinfo *info =
			&sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i;

	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(dquot->dq_id);
	if (qtree_entry_unused(info, dp))
		d->dqb_itime = cpu_to_le64(1);
}

static int v2_is_id(void *dp, struct dquot *dquot)
{
	struct v2_disk_dqblk *d = dp;
	struct qtree_mem_dqinfo *info =
			&sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i;

	if (qtree_entry_unused(info, dp))
		return 0;
	return le32_to_cpu(d->dqb_id) == dquot->dq_id;
}

static int v2_read_dquot(struct dquot *dquot)
{
	return qtree_read_dquot(&sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i, dquot);
}

static int v2_write_dquot(struct dquot *dquot)
{
	return qtree_write_dquot(&sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i, dquot);
}

static int v2_release_dquot(struct dquot *dquot)
{
	return qtree_release_dquot(&sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i, dquot);
}

static 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		= NULL,
	.read_dqblk		= v2_read_dquot,
	.commit_dqblk		= v2_write_dquot,
	.release_dqblk		= v2_release_dquot,
};

static struct quota_format_type v2_quota_format = {
	.qf_fmt_id	= QFMT_VFS_V0,
	.qf_ops		= &v2_format_ops,
	.qf_owner	= THIS_MODULE
};

static int __init init_v2_quota_format(void)
{
	return register_quota_format(&v2_quota_format);
}

static void __exit exit_v2_quota_format(void)
{
	unregister_quota_format(&v2_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
1ccd14b9 JK	26	static void v2_mem2diskdqb(void dp, struct dquot dquot);
	27	static void v2_disk2memdqb(struct dquot dquot, void dp);
	28	static int v2_is_id(void dp, struct dquot dquot);
1da177e4	29
1ccd14b9 JK	30	static struct qtree_fmt_operations v2_qtree_ops = {
	31	.mem2disk_dqblk = v2_mem2diskdqb,
	32	.disk2mem_dqblk = v2_disk2memdqb,
	33	.is_id = v2_is_id,
	34	};
1da177e4	35
12095460 JK	36	#define QUOTABLOCK_BITS 10
	37	#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
	38
	39	static inline qsize_t v2_stoqb(qsize_t space)
	40	{
	41	return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
	42	}
	43
	44	static inline qsize_t v2_qbtos(qsize_t blocks)
	45	{
	46	return blocks << QUOTABLOCK_BITS;
	47	}
	48
1da177e4 LT	49	/* Check whether given file is really vfsv0 quotafile */
	50	static int v2_check_quota_file(struct super_block *sb, int type)
	51	{
	52	struct v2_disk_dqheader dqhead;
	53	ssize_t size;
	54	static const uint quota_magics[] = V2_INITQMAGICS;
	55	static const uint quota_versions[] = V2_INITQVERSIONS;
	56
	57	size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);
	58	if (size != sizeof(struct v2_disk_dqheader)) {
8c17e1eb	59	printk("quota_v2: failed read expected=%zd got=%zd\n",
31358063	60	sizeof(struct v2_disk_dqheader), size);
1da177e4 LT	61	return 0;
	62	}
	63	if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] \|\|
	64	le32_to_cpu(dqhead.dqh_version) != quota_versions[type])
	65	return 0;
	66	return 1;
	67	}
	68
	69	/* Read information header from quota file */
	70	static int v2_read_file_info(struct super_block *sb, int type)
	71	{
	72	struct v2_disk_dqinfo dinfo;
1ccd14b9	73	struct mem_dqinfo *info = sb_dqinfo(sb, type);
1da177e4 LT	74	ssize_t size;
	75
	76	size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
	77	sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
	78	if (size != sizeof(struct v2_disk_dqinfo)) {
	79	printk(KERN_WARNING "Can't read info structure on device %s.\n",
	80	sb->s_id);
	81	return -1;
	82	}
338bf9af AP	83	/* limits are stored as unsigned 32-bit data */
	84	info->dqi_maxblimit = 0xffffffff;
	85	info->dqi_maxilimit = 0xffffffff;
1da177e4 LT	86	info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
	87	info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
	88	info->dqi_flags = le32_to_cpu(dinfo.dqi_flags);
1ccd14b9 JK	89	info->u.v2_i.i.dqi_sb = sb;
	90	info->u.v2_i.i.dqi_type = type;
	91	info->u.v2_i.i.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
	92	info->u.v2_i.i.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
	93	info->u.v2_i.i.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
	94	info->u.v2_i.i.dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
	95	info->u.v2_i.i.dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
	96	info->u.v2_i.i.dqi_qtree_depth = qtree_depth(&info->u.v2_i.i);
	97	info->u.v2_i.i.dqi_entry_size = sizeof(struct v2_disk_dqblk);
	98	info->u.v2_i.i.dqi_ops = &v2_qtree_ops;
1da177e4 LT	99	return 0;
	100	}
	101
	102	/* Write information header to quota file */
	103	static int v2_write_file_info(struct super_block *sb, int type)
	104	{
	105	struct v2_disk_dqinfo dinfo;
1ccd14b9	106	struct mem_dqinfo *info = sb_dqinfo(sb, type);
1da177e4 LT	107	ssize_t size;
	108
	109	spin_lock(&dq_data_lock);
	110	info->dqi_flags &= ~DQF_INFO_DIRTY;
	111	dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
	112	dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
	113	dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
	114	spin_unlock(&dq_data_lock);
1ccd14b9 JK	115	dinfo.dqi_blocks = cpu_to_le32(info->u.v2_i.i.dqi_blocks);
	116	dinfo.dqi_free_blk = cpu_to_le32(info->u.v2_i.i.dqi_free_blk);
	117	dinfo.dqi_free_entry = cpu_to_le32(info->u.v2_i.i.dqi_free_entry);
1da177e4 LT	118	size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
	119	sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
	120	if (size != sizeof(struct v2_disk_dqinfo)) {
	121	printk(KERN_WARNING "Can't write info structure on device %s.\n",
	122	sb->s_id);
	123	return -1;
	124	}
	125	return 0;
	126	}
	127
1ccd14b9	128	static void v2_disk2memdqb(struct dquot dquot, void dp)
1da177e4	129	{
1ccd14b9 JK	130	struct v2_disk_dqblk *d = dp, empty;
	131	struct mem_dqblk *m = &dquot->dq_dqb;
	132
1da177e4 LT	133	m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
	134	m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
	135	m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
	136	m->dqb_itime = le64_to_cpu(d->dqb_itime);
12095460 JK	137	m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
12095460 JK	138	m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
1da177e4 LT	139	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
1da177e4 LT	140	m->dqb_btime = le64_to_cpu(d->dqb_btime);
1ccd14b9 JK	141	/* We need to escape back all-zero structure */
	142	memset(&empty, 0, sizeof(struct v2_disk_dqblk));
	143	empty.dqb_itime = cpu_to_le64(1);
	144	if (!memcmp(&empty, dp, sizeof(struct v2_disk_dqblk)))
	145	m->dqb_itime = 0;
1da177e4 LT	146	}
1da177e4 LT	147
1ccd14b9	148	static void v2_mem2diskdqb(void dp, struct dquot dquot)
1da177e4	149	{
1ccd14b9 JK	150	struct v2_disk_dqblk *d = dp;
	151	struct mem_dqblk *m = &dquot->dq_dqb;
	152	struct qtree_mem_dqinfo *info =
	153	&sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i;
	154
1da177e4 LT	155	d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
	156	d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
	157	d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
	158	d->dqb_itime = cpu_to_le64(m->dqb_itime);
cf770c13 JK	159	d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit));
cf770c13 JK	160	d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit));
1da177e4 LT	161	d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
1da177e4 LT	162	d->dqb_btime = cpu_to_le64(m->dqb_btime);
1ccd14b9 JK	163	d->dqb_id = cpu_to_le32(dquot->dq_id);
	164	if (qtree_entry_unused(info, dp))
	165	d->dqb_itime = cpu_to_le64(1);
1da177e4 LT	166	}
1da177e4 LT	167
1ccd14b9	168	static int v2_is_id(void dp, struct dquot dquot)
1da177e4	169	{
1ccd14b9 JK	170	struct v2_disk_dqblk *d = dp;
	171	struct qtree_mem_dqinfo *info =
	172	&sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i;
1da177e4	173
1ccd14b9	174	if (qtree_entry_unused(info, dp))
1da177e4	175	return 0;
1ccd14b9	176	return le32_to_cpu(d->dqb_id) == dquot->dq_id;
1da177e4 LT	177	}
1da177e4 LT	178
1ccd14b9	179	static int v2_read_dquot(struct dquot *dquot)
1da177e4	180	{
1ccd14b9	181	return qtree_read_dquot(&sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i, dquot);
1da177e4 LT	182	}
1da177e4 LT	183
1da177e4 LT	184	static int v2_write_dquot(struct dquot *dquot)
1da177e4 LT	185	{
1ccd14b9	186	return qtree_write_dquot(&sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i, dquot);
1da177e4 LT	187	}
1da177e4 LT	188
1da177e4 LT	189	static int v2_release_dquot(struct dquot *dquot)
1da177e4 LT	190	{
1ccd14b9	191	return qtree_release_dquot(&sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i, dquot);
1da177e4 LT	192	}
	193
	194	static struct quota_format_ops v2_format_ops = {
	195	.check_quota_file = v2_check_quota_file,
	196	.read_file_info = v2_read_file_info,
	197	.write_file_info = v2_write_file_info,
	198	.free_file_info = NULL,
	199	.read_dqblk = v2_read_dquot,
	200	.commit_dqblk = v2_write_dquot,
	201	.release_dqblk = v2_release_dquot,
	202	};
	203
	204	static struct quota_format_type v2_quota_format = {
	205	.qf_fmt_id = QFMT_VFS_V0,
	206	.qf_ops = &v2_format_ops,
	207	.qf_owner = THIS_MODULE
	208	};
	209
	210	static int __init init_v2_quota_format(void)
	211	{
	212	return register_quota_format(&v2_quota_format);
	213	}
	214
	215	static void __exit exit_v2_quota_format(void)
	216	{
	217	unregister_quota_format(&v2_quota_format);
	218	}
	219
	220	module_init(init_v2_quota_format);
	221	module_exit(exit_v2_quota_format);