| #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", |
| dquot->dq_sb->s_id); |
| 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", 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); |
| 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); |
| |