Commit dcfb8111 authored by Jan Kara's avatar Jan Kara Committed by Linus Torvalds

[PATCH] [8/13] quota-8-format1

Implementation of old quota format. All the code for old format is now in
quota_v1.c. Code mostly remained the same as in older kernels (just minor
changes were needed to bind it with quota interface).
parent b5abbc1f
......@@ -6,6 +6,11 @@ CONFIG_QUOTA
<http://www.linuxdoc.org/docs.html#howto>. Probably the quota
support is only useful for multi user systems. If unsure, say N.
CONFIG_QFMT_V1
This quota format was (is) used by kernels earlier than 2.4.??. If
you have quota working and you don't want to convert to new quota
format say Y here.
CONFIG_MINIX_FS
Minix is a simple operating system used in many classes about OS's.
The minix file system (method to organize files on a hard disk
......
......@@ -5,6 +5,7 @@ mainmenu_option next_comment
comment 'File systems'
bool 'Quota support' CONFIG_QUOTA
dep_tristate ' Old quota format support' CONFIG_QFMT_V1 $CONFIG_QUOTA
tristate 'Kernel automounter support' CONFIG_AUTOFS_FS
tristate 'Kernel automounter version 4 support (also supports v3)' CONFIG_AUTOFS4_FS
......
......@@ -82,6 +82,7 @@ obj-y += binfmt_script.o
obj-$(CONFIG_BINFMT_ELF) += binfmt_elf.o
obj-$(CONFIG_QUOTA) += dquot.o
obj-$(CONFIG_QFMT_V1) += quota_v1.o
# persistent filesystems
obj-y += $(join $(subdir-y),$(subdir-y:%=/%.o))
......
......@@ -792,7 +792,10 @@ static inline void flush_warnings(struct dquot **dquots, char *warntype)
static inline char ignore_hardlimit(struct dquot *dquot)
{
return capable(CAP_SYS_RESOURCE);
struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
return capable(CAP_SYS_RESOURCE) &&
(info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || !(info->dqi_flags & V1_DQF_RSQUASH));
}
static int check_idq(struct dquot *dquot, ulong inodes, char *warntype)
......
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/quota.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/uaccess.h>
#include <asm/byteorder.h>
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 = d->dqb_bhardlimit;
m->dqb_bsoftlimit = d->dqb_bsoftlimit;
m->dqb_curspace = d->dqb_curblocks << QUOTABLOCK_BITS;
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 = m->dqb_bhardlimit;
d->dqb_bsoftlimit = m->dqb_bsoftlimit;
d->dqb_curblocks = toqb(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 file *filp;
mm_segment_t fs;
loff_t offset;
struct v1_disk_dqblk dqblk;
filp = sb_dqopt(dquot->dq_sb)->files[type];
if (filp == (struct file *)NULL)
return -EINVAL;
/* Now we are sure filp is valid */
offset = v1_dqoff(dquot->dq_id);
fs = get_fs();
set_fs(KERNEL_DS);
filp->f_op->read(filp, (char *)&dqblk, sizeof(struct v1_disk_dqblk), &offset);
set_fs(fs);
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)
dquot->dq_flags |= DQ_FAKE;
dqstats.reads++;
return 0;
}
static int v1_commit_dqblk(struct dquot *dquot)
{
short type = dquot->dq_type;
struct file *filp;
mm_segment_t fs;
loff_t offset;
ssize_t ret;
struct v1_disk_dqblk dqblk;
filp = sb_dqopt(dquot->dq_sb)->files[type];
offset = v1_dqoff(dquot->dq_id);
fs = get_fs();
set_fs(KERNEL_DS);
/*
* Note: clear the DQ_MOD flag unconditionally,
* so we don't loop forever on failure.
*/
v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);
dquot->dq_flags &= ~DQ_MOD;
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 (filp)
ret = filp->f_op->write(filp, (char *)&dqblk,
sizeof(struct v1_disk_dqblk), &offset);
if (ret != sizeof(struct v1_disk_dqblk)) {
printk(KERN_WARNING "VFS: dquota write failed on dev %s\n",
kdevname(dquot->dq_sb->s_dev));
if (ret >= 0)
ret = -EIO;
goto out;
}
ret = 0;
out:
set_fs(fs);
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 {
__u32 dqh_magic; /* Magic number identifying file */
__u32 dqh_version; /* File version */
};
static int v1_check_quota_file(struct super_block *sb, int type)
{
struct file *f = sb_dqopt(sb)->files[type];
struct inode *inode = f->f_dentry->d_inode;
ulong blocks;
size_t off;
struct v2_disk_dqheader dqhead;
mm_segment_t fs;
ssize_t size;
loff_t offset = 0;
static const uint quota_magics[] = V2_INITQMAGICS;
if (!inode->i_size)
return 0;
blocks = inode->i_size >> BLOCK_SIZE_BITS;
off = inode->i_size & (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 */
fs = get_fs();
set_fs(KERNEL_DS);
size = f->f_op->read(f, (char *)&dqhead, sizeof(struct v2_disk_dqheader), &offset);
set_fs(fs);
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", kdevname(sb->s_dev));
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);
mm_segment_t fs;
loff_t offset;
struct file *filp = dqopt->files[type];
struct v1_disk_dqblk dqblk;
int ret;
down(&dqopt->dqio_sem);
offset = v1_dqoff(0);
fs = get_fs();
set_fs(KERNEL_DS);
if ((ret = filp->f_op->read(filp, (char *)&dqblk, sizeof(struct v1_disk_dqblk), &offset)) != sizeof(struct v1_disk_dqblk)) {
if (ret >= 0)
ret = -EIO;
goto out;
}
ret = 0;
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:
up(&dqopt->dqio_sem);
set_fs(fs);
return ret;
}
static int v1_write_file_info(struct super_block *sb, int type)
{
struct quota_info *dqopt = sb_dqopt(sb);
mm_segment_t fs;
struct file *filp = dqopt->files[type];
struct v1_disk_dqblk dqblk;
loff_t offset;
int ret;
down(&dqopt->dqio_sem);
dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY;
offset = v1_dqoff(0);
fs = get_fs();
set_fs(KERNEL_DS);
if ((ret = filp->f_op->read(filp, (char *)&dqblk, sizeof(struct v1_disk_dqblk), &offset)) != 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;
offset = v1_dqoff(0);
ret = filp->f_op->write(filp, (char *)&dqblk, sizeof(struct v1_disk_dqblk), &offset);
if (ret == sizeof(struct v1_disk_dqblk))
ret = 0;
else if (ret > 0)
ret = -EIO;
out:
up(&dqopt->dqio_sem);
set_fs(fs);
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);
}
EXPORT_NO_SYMBOLS;
module_init(init_v1_quota_format);
module_exit(exit_v1_quota_format);
/*
* File with in-memory structures of old quota format
*/
#ifndef _LINUX_DQBLK_V1_H
#define _LINUX_DQBLK_V1_H
/* Id of quota format */
#define QFMT_VFS_OLD 1
/* Root squash turned on */
#define V1_DQF_RSQUASH 1
/* Special information about quotafile */
struct v1_mem_dqinfo {
};
#endif /* _LINUX_DQBLK_V1_H */
......@@ -135,6 +135,7 @@ struct if_dqinfo {
#ifdef __KERNEL__
#include <linux/xqm.h>
#include <linux/dqblk_v1.h>
/*
* Data for one user/group kept in memory
......@@ -161,6 +162,7 @@ struct mem_dqinfo {
unsigned int dqi_bgrace;
unsigned int dqi_igrace;
union {
struct v1_mem_dqinfo v1_i;
} u;
};
......
#ifndef _LINUX_QUOTAIO_V1_H
#define _LINUX_QUOTAIO_V1_H
#include <linux/types.h>
/*
* The following constants define the amount of time given a user
* before the soft limits are treated as hard limits (usually resulting
* in an allocation failure). The timer is started when the user crosses
* their soft limit, it is reset when they go below their soft limit.
*/
#define MAX_IQ_TIME 604800 /* (7*24*60*60) 1 week */
#define MAX_DQ_TIME 604800 /* (7*24*60*60) 1 week */
/*
* The following structure defines the format of the disk quota file
* (as it appears on disk) - the file is an array of these structures
* indexed by user or group number.
*/
struct v1_disk_dqblk {
__u32 dqb_bhardlimit; /* absolute limit on disk blks alloc */
__u32 dqb_bsoftlimit; /* preferred limit on disk blks */
__u32 dqb_curblocks; /* current block count */
__u32 dqb_ihardlimit; /* absolute limit on allocated inodes */
__u32 dqb_isoftlimit; /* preferred inode limit */
__u32 dqb_curinodes; /* current # allocated inodes */
time_t dqb_btime; /* time limit for excessive disk use */
time_t dqb_itime; /* time limit for excessive inode use */
};
#define v1_dqoff(UID) ((loff_t)((UID) * sizeof (struct v1_disk_dqblk)))
#endif /* _LINUX_QUOTAIO_V1_H */
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