1 #include <linux/errno.h>
2 #include <linux/fs.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>
9
10 #include <asm/byteorder.h>
11
12 MODULE_AUTHOR("Jan Kara");
13 MODULE_DESCRIPTION("Old quota format support");
14 MODULE_LICENSE("GPL");
15
16 static void v1_disk2mem_dqblk(struct mem_dqblk *m, struct v1_disk_dqblk *d)
17 {
18 m->dqb_ihardlimit = d->dqb_ihardlimit;
19 m->dqb_isoftlimit = d->dqb_isoftlimit;
20 m->dqb_curinodes = d->dqb_curinodes;
21 m->dqb_bhardlimit = d->dqb_bhardlimit;
22 m->dqb_bsoftlimit = d->dqb_bsoftlimit;
23 m->dqb_curspace = ((qsize_t)d->dqb_curblocks) << QUOTABLOCK_BITS;
24 m->dqb_itime = d->dqb_itime;
25 m->dqb_btime = d->dqb_btime;
26 }
27
28 static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m)
29 {
30 d->dqb_ihardlimit = m->dqb_ihardlimit;
31 d->dqb_isoftlimit = m->dqb_isoftlimit;
32 d->dqb_curinodes = m->dqb_curinodes;
33 d->dqb_bhardlimit = m->dqb_bhardlimit;
34 d->dqb_bsoftlimit = m->dqb_bsoftlimit;
35 d->dqb_curblocks = toqb(m->dqb_curspace);
36 d->dqb_itime = m->dqb_itime;
37 d->dqb_btime = m->dqb_btime;
38 }
39
40 static int v1_read_dqblk(struct dquot *dquot)
41 {
42 int type = dquot->dq_type;
43 struct v1_disk_dqblk dqblk;
44
45 if (!sb_dqopt(dquot->dq_sb)->files[type])
46 return -EINVAL;
47
48 /* Set structure to 0s in case read fails/is after end of file */
49 memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
50 dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));
51
52 v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk);
53 if (dquot->dq_dqb.dqb_bhardlimit == 0 && dquot->dq_dqb.dqb_bsoftlimit == 0 &&
54 dquot->dq_dqb.dqb_ihardlimit == 0 && dquot->dq_dqb.dqb_isoftlimit == 0)
55 set_bit(DQ_FAKE_B, &dquot->dq_flags);
56 dqstats.reads++;
57
58 return 0;
59 }
60
61 static int v1_commit_dqblk(struct dquot *dquot)
62 {
63 short type = dquot->dq_type;
64 ssize_t ret;
65 struct v1_disk_dqblk dqblk;
66
67 v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);
68 if (dquot->dq_id == 0) {
69 dqblk.dqb_btime = sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace;
70 dqblk.dqb_itime = sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace;
71 }
72 ret = 0;
73 if (sb_dqopt(dquot->dq_sb)->files[type])
74 ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type, (char *)&dqblk,
75 sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));
76 if (ret != sizeof(struct v1_disk_dqblk)) {
77 printk(KERN_WARNING "VFS: dquota write failed on dev %s\n",
78 dquot->dq_sb->s_id);
79 if (ret >= 0)
80 ret = -EIO;
81 goto out;
82 }
83 ret = 0;
84
85 out:
86 dqstats.writes++;
87
88 return ret;
89 }
90
91 /* Magics of new quota format */
92 #define V2_INITQMAGICS {\
93 0xd9c01f11, /* USRQUOTA */\
94 0xd9c01927 /* GRPQUOTA */\
95 }
96
97 /* Header of new quota format */
98 struct v2_disk_dqheader {
99 __le32 dqh_magic; /* Magic number identifying file */
100 __le32 dqh_version; /* File version */
101 };
102
103 static int v1_check_quota_file(struct super_block *sb, int type)
104 {
105 struct inode *inode = sb_dqopt(sb)->files[type];
106 ulong blocks;
107 size_t off;
108 struct v2_disk_dqheader dqhead;
109 ssize_t size;
110 loff_t isize;
111 static const uint quota_magics[] = V2_INITQMAGICS;
112
113 isize = i_size_read(inode);
114 if (!isize)
115 return 0;
116 blocks = isize >> BLOCK_SIZE_BITS;
117 off = isize & (BLOCK_SIZE - 1);
118 if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) % sizeof(struct v1_disk_dqblk))
119 return 0;
120 /* Doublecheck whether we didn't get file with new format - with old quotactl() this could happen */
121 size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);
122 if (size != sizeof(struct v2_disk_dqheader))
123 return 1; /* Probably not new format */
124 if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type])
125 return 1; /* Definitely not new format */
126 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);
127 return 0; /* Seems like a new format file -> refuse it */
128 }
129
130 static int v1_read_file_info(struct super_block *sb, int type)
131 {
132 struct quota_info *dqopt = sb_dqopt(sb);
133 struct v1_disk_dqblk dqblk;
134 int ret;
135
136 if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {
137 if (ret >= 0)
138 ret = -EIO;
139 goto out;
140 }
141 ret = 0;
142 dqopt->info[type].dqi_igrace = dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;
143 dqopt->info[type].dqi_bgrace = dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;
144 out:
145 return ret;
146 }
147
148 static int v1_write_file_info(struct super_block *sb, int type)
149 {
150 struct quota_info *dqopt = sb_dqopt(sb);
151 struct v1_disk_dqblk dqblk;
152 int ret;
153
154 dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY;
155 if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk,
156 sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {
157 if (ret >= 0)
158 ret = -EIO;
159 goto out;
160 }
161 dqblk.dqb_itime = dqopt->info[type].dqi_igrace;
162 dqblk.dqb_btime = dqopt->info[type].dqi_bgrace;
163 ret = sb->s_op->quota_write(sb, type, (char *)&dqblk,
164 sizeof(struct v1_disk_dqblk), v1_dqoff(0));
165 if (ret == sizeof(struct v1_disk_dqblk))
166 ret = 0;
167 else if (ret > 0)
168 ret = -EIO;
169 out:
170 return ret;
171 }
172
173 static struct quota_format_ops v1_format_ops = {
174 .check_quota_file = v1_check_quota_file,
175 .read_file_info = v1_read_file_info,
176 .write_file_info = v1_write_file_info,
177 .free_file_info = NULL,
178 .read_dqblk = v1_read_dqblk,
179 .commit_dqblk = v1_commit_dqblk,
180 };
181
182 static struct quota_format_type v1_quota_format = {
183 .qf_fmt_id = QFMT_VFS_OLD,
184 .qf_ops = &v1_format_ops,
185 .qf_owner = THIS_MODULE
186 };
187
188 static int __init init_v1_quota_format(void)
189 {
190 return register_quota_format(&v1_quota_format);
191 }
192
193 static void __exit exit_v1_quota_format(void)
194 {
195 unregister_quota_format(&v1_quota_format);
196 }
197
198 module_init(init_v1_quota_format);
199 module_exit(exit_v1_quota_format);
200
201
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