1 #include <linux/errno.h>
3 #include <linux/quota.h>
4 #include <linux/dqblk_v1.h>
5 #include <linux/quotaio_v1.h>
6 #include <linux/kernel.h>
7 #include <linux/init.h>
8 #include <linux/module.h>
10 #include <asm/uaccess.h>
11 #include <asm/byteorder.h>
13 MODULE_AUTHOR("Jan Kara");
14 MODULE_DESCRIPTION("Old quota format support");
15 MODULE_LICENSE("GPL");
17 static void v1_disk2mem_dqblk(struct mem_dqblk *m, struct v1_disk_dqblk *d)
19 m->dqb_ihardlimit = d->dqb_ihardlimit;
20 m->dqb_isoftlimit = d->dqb_isoftlimit;
21 m->dqb_curinodes = d->dqb_curinodes;
22 m->dqb_bhardlimit = d->dqb_bhardlimit;
23 m->dqb_bsoftlimit = d->dqb_bsoftlimit;
24 m->dqb_curspace = ((qsize_t)d->dqb_curblocks) << QUOTABLOCK_BITS;
25 m->dqb_itime = d->dqb_itime;
26 m->dqb_btime = d->dqb_btime;
29 static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m)
31 d->dqb_ihardlimit = m->dqb_ihardlimit;
32 d->dqb_isoftlimit = m->dqb_isoftlimit;
33 d->dqb_curinodes = m->dqb_curinodes;
34 d->dqb_bhardlimit = m->dqb_bhardlimit;
35 d->dqb_bsoftlimit = m->dqb_bsoftlimit;
36 d->dqb_curblocks = toqb(m->dqb_curspace);
37 d->dqb_itime = m->dqb_itime;
38 d->dqb_btime = m->dqb_btime;
41 static int v1_read_dqblk(struct dquot *dquot)
43 int type = dquot->dq_type;
47 struct v1_disk_dqblk dqblk;
49 filp = sb_dqopt(dquot->dq_sb)->files[type];
50 if (filp == (struct file *)NULL)
53 /* Now we are sure filp is valid */
54 offset = v1_dqoff(dquot->dq_id);
55 /* Set structure to 0s in case read fails/is after end of file */
56 memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
59 filp->f_op->read(filp, (char *)&dqblk, sizeof(struct v1_disk_dqblk), &offset);
62 v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk);
63 if (dquot->dq_dqb.dqb_bhardlimit == 0 && dquot->dq_dqb.dqb_bsoftlimit == 0 &&
64 dquot->dq_dqb.dqb_ihardlimit == 0 && dquot->dq_dqb.dqb_isoftlimit == 0)
65 set_bit(DQ_FAKE_B, &dquot->dq_flags);
71 static int v1_commit_dqblk(struct dquot *dquot)
73 short type = dquot->dq_type;
78 struct v1_disk_dqblk dqblk;
80 filp = sb_dqopt(dquot->dq_sb)->files[type];
81 offset = v1_dqoff(dquot->dq_id);
85 v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);
86 if (dquot->dq_id == 0) {
87 dqblk.dqb_btime = sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace;
88 dqblk.dqb_itime = sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace;
92 ret = filp->f_op->write(filp, (char *)&dqblk,
93 sizeof(struct v1_disk_dqblk), &offset);
94 if (ret != sizeof(struct v1_disk_dqblk)) {
95 printk(KERN_WARNING "VFS: dquota write failed on dev %s\n",
110 /* Magics of new quota format */
111 #define V2_INITQMAGICS {\
112 0xd9c01f11, /* USRQUOTA */\
113 0xd9c01927 /* GRPQUOTA */\
116 /* Header of new quota format */
117 struct v2_disk_dqheader {
118 __le32 dqh_magic; /* Magic number identifying file */
119 __le32 dqh_version; /* File version */
122 static int v1_check_quota_file(struct super_block *sb, int type)
124 struct file *f = sb_dqopt(sb)->files[type];
125 struct inode *inode = f->f_dentry->d_inode;
128 struct v2_disk_dqheader dqhead;
133 static const uint quota_magics[] = V2_INITQMAGICS;
135 isize = i_size_read(inode);
138 blocks = isize >> BLOCK_SIZE_BITS;
139 off = isize & (BLOCK_SIZE - 1);
140 if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) % sizeof(struct v1_disk_dqblk))
142 /* Doublecheck whether we didn't get file with new format - with old quotactl() this could happen */
145 size = f->f_op->read(f, (char *)&dqhead, sizeof(struct v2_disk_dqheader), &offset);
147 if (size != sizeof(struct v2_disk_dqheader))
148 return 1; /* Probably not new format */
149 if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type])
150 return 1; /* Definitely not new format */
151 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);
152 return 0; /* Seems like a new format file -> refuse it */
155 static int v1_read_file_info(struct super_block *sb, int type)
157 struct quota_info *dqopt = sb_dqopt(sb);
160 struct file *filp = dqopt->files[type];
161 struct v1_disk_dqblk dqblk;
164 offset = v1_dqoff(0);
167 if ((ret = filp->f_op->read(filp, (char *)&dqblk, sizeof(struct v1_disk_dqblk), &offset)) != sizeof(struct v1_disk_dqblk)) {
173 dqopt->info[type].dqi_igrace = dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;
174 dqopt->info[type].dqi_bgrace = dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;
180 static int v1_write_file_info(struct super_block *sb, int type)
182 struct quota_info *dqopt = sb_dqopt(sb);
184 struct file *filp = dqopt->files[type];
185 struct v1_disk_dqblk dqblk;
189 dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY;
190 offset = v1_dqoff(0);
193 if ((ret = filp->f_op->read(filp, (char *)&dqblk, sizeof(struct v1_disk_dqblk), &offset)) != sizeof(struct v1_disk_dqblk)) {
198 dqblk.dqb_itime = dqopt->info[type].dqi_igrace;
199 dqblk.dqb_btime = dqopt->info[type].dqi_bgrace;
200 offset = v1_dqoff(0);
201 ret = filp->f_op->write(filp, (char *)&dqblk, sizeof(struct v1_disk_dqblk), &offset);
202 if (ret == sizeof(struct v1_disk_dqblk))
211 static struct quota_format_ops v1_format_ops = {
212 .check_quota_file = v1_check_quota_file,
213 .read_file_info = v1_read_file_info,
214 .write_file_info = v1_write_file_info,
215 .free_file_info = NULL,
216 .read_dqblk = v1_read_dqblk,
217 .commit_dqblk = v1_commit_dqblk,
220 static struct quota_format_type v1_quota_format = {
221 .qf_fmt_id = QFMT_VFS_OLD,
222 .qf_ops = &v1_format_ops,
223 .qf_owner = THIS_MODULE
226 static int __init init_v1_quota_format(void)
228 return register_quota_format(&v1_quota_format);
231 static void __exit exit_v1_quota_format(void)
233 unregister_quota_format(&v1_quota_format);
236 module_init(init_v1_quota_format);
237 module_exit(exit_v1_quota_format);