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/*
* 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);
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