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1da177e4 LT |
1 | #include <linux/errno.h> |
2 | #include <linux/fs.h> | |
3 | #include <linux/quota.h> | |
74abb989 | 4 | #include <linux/quotaops.h> |
1da177e4 | 5 | #include <linux/dqblk_v1.h> |
1da177e4 LT |
6 | #include <linux/kernel.h> |
7 | #include <linux/init.h> | |
8 | #include <linux/module.h> | |
9 | ||
10 | #include <asm/byteorder.h> | |
11 | ||
cf770c13 JK |
12 | #include "quotaio_v1.h" |
13 | ||
1da177e4 LT |
14 | MODULE_AUTHOR("Jan Kara"); |
15 | MODULE_DESCRIPTION("Old quota format support"); | |
16 | MODULE_LICENSE("GPL"); | |
17 | ||
12095460 JK |
18 | #define QUOTABLOCK_BITS 10 |
19 | #define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS) | |
20 | ||
21 | static inline qsize_t v1_stoqb(qsize_t space) | |
22 | { | |
23 | return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS; | |
24 | } | |
25 | ||
26 | static inline qsize_t v1_qbtos(qsize_t blocks) | |
27 | { | |
28 | return blocks << QUOTABLOCK_BITS; | |
29 | } | |
30 | ||
1da177e4 LT |
31 | static void v1_disk2mem_dqblk(struct mem_dqblk *m, struct v1_disk_dqblk *d) |
32 | { | |
33 | m->dqb_ihardlimit = d->dqb_ihardlimit; | |
34 | m->dqb_isoftlimit = d->dqb_isoftlimit; | |
35 | m->dqb_curinodes = d->dqb_curinodes; | |
12095460 JK |
36 | m->dqb_bhardlimit = v1_qbtos(d->dqb_bhardlimit); |
37 | m->dqb_bsoftlimit = v1_qbtos(d->dqb_bsoftlimit); | |
38 | m->dqb_curspace = v1_qbtos(d->dqb_curblocks); | |
1da177e4 LT |
39 | m->dqb_itime = d->dqb_itime; |
40 | m->dqb_btime = d->dqb_btime; | |
41 | } | |
42 | ||
43 | static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m) | |
44 | { | |
45 | d->dqb_ihardlimit = m->dqb_ihardlimit; | |
46 | d->dqb_isoftlimit = m->dqb_isoftlimit; | |
47 | d->dqb_curinodes = m->dqb_curinodes; | |
12095460 JK |
48 | d->dqb_bhardlimit = v1_stoqb(m->dqb_bhardlimit); |
49 | d->dqb_bsoftlimit = v1_stoqb(m->dqb_bsoftlimit); | |
50 | d->dqb_curblocks = v1_stoqb(m->dqb_curspace); | |
1da177e4 LT |
51 | d->dqb_itime = m->dqb_itime; |
52 | d->dqb_btime = m->dqb_btime; | |
53 | } | |
54 | ||
55 | static int v1_read_dqblk(struct dquot *dquot) | |
56 | { | |
4c376dca | 57 | int type = dquot->dq_id.type; |
1da177e4 | 58 | struct v1_disk_dqblk dqblk; |
e342e38d | 59 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
1da177e4 | 60 | |
e342e38d | 61 | if (!dqopt->files[type]) |
1da177e4 LT |
62 | return -EINVAL; |
63 | ||
64 | /* Set structure to 0s in case read fails/is after end of file */ | |
65 | memset(&dqblk, 0, sizeof(struct v1_disk_dqblk)); | |
268157ba | 66 | dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk, |
4c376dca EB |
67 | sizeof(struct v1_disk_dqblk), |
68 | v1_dqoff(from_kqid(&init_user_ns, dquot->dq_id))); | |
1da177e4 LT |
69 | |
70 | v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk); | |
268157ba JK |
71 | if (dquot->dq_dqb.dqb_bhardlimit == 0 && |
72 | dquot->dq_dqb.dqb_bsoftlimit == 0 && | |
73 | dquot->dq_dqb.dqb_ihardlimit == 0 && | |
74 | dquot->dq_dqb.dqb_isoftlimit == 0) | |
1da177e4 | 75 | set_bit(DQ_FAKE_B, &dquot->dq_flags); |
dde95888 | 76 | dqstats_inc(DQST_READS); |
1da177e4 LT |
77 | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static int v1_commit_dqblk(struct dquot *dquot) | |
82 | { | |
4c376dca | 83 | short type = dquot->dq_id.type; |
1da177e4 LT |
84 | ssize_t ret; |
85 | struct v1_disk_dqblk dqblk; | |
86 | ||
87 | v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb); | |
4c376dca EB |
88 | if (((type == USRQUOTA) && uid_eq(dquot->dq_id.uid, GLOBAL_ROOT_UID)) || |
89 | ((type == GRPQUOTA) && gid_eq(dquot->dq_id.gid, GLOBAL_ROOT_GID))) { | |
268157ba JK |
90 | dqblk.dqb_btime = |
91 | sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace; | |
92 | dqblk.dqb_itime = | |
93 | sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace; | |
1da177e4 LT |
94 | } |
95 | ret = 0; | |
96 | if (sb_dqopt(dquot->dq_sb)->files[type]) | |
268157ba JK |
97 | ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type, |
98 | (char *)&dqblk, sizeof(struct v1_disk_dqblk), | |
4c376dca | 99 | v1_dqoff(from_kqid(&init_user_ns, dquot->dq_id))); |
1da177e4 | 100 | if (ret != sizeof(struct v1_disk_dqblk)) { |
fb5ffb0e | 101 | quota_error(dquot->dq_sb, "dquota write failed"); |
1da177e4 LT |
102 | if (ret >= 0) |
103 | ret = -EIO; | |
104 | goto out; | |
105 | } | |
106 | ret = 0; | |
107 | ||
108 | out: | |
dde95888 | 109 | dqstats_inc(DQST_WRITES); |
1da177e4 LT |
110 | |
111 | return ret; | |
112 | } | |
113 | ||
114 | /* Magics of new quota format */ | |
115 | #define V2_INITQMAGICS {\ | |
116 | 0xd9c01f11, /* USRQUOTA */\ | |
117 | 0xd9c01927 /* GRPQUOTA */\ | |
118 | } | |
119 | ||
120 | /* Header of new quota format */ | |
121 | struct v2_disk_dqheader { | |
122 | __le32 dqh_magic; /* Magic number identifying file */ | |
123 | __le32 dqh_version; /* File version */ | |
124 | }; | |
125 | ||
126 | static int v1_check_quota_file(struct super_block *sb, int type) | |
127 | { | |
128 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
129 | ulong blocks; | |
130 | size_t off; | |
131 | struct v2_disk_dqheader dqhead; | |
132 | ssize_t size; | |
133 | loff_t isize; | |
134 | static const uint quota_magics[] = V2_INITQMAGICS; | |
135 | ||
136 | isize = i_size_read(inode); | |
137 | if (!isize) | |
138 | return 0; | |
139 | blocks = isize >> BLOCK_SIZE_BITS; | |
140 | off = isize & (BLOCK_SIZE - 1); | |
268157ba JK |
141 | if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) % |
142 | sizeof(struct v1_disk_dqblk)) | |
1da177e4 | 143 | return 0; |
268157ba JK |
144 | /* Doublecheck whether we didn't get file with new format - with old |
145 | * quotactl() this could happen */ | |
146 | size = sb->s_op->quota_read(sb, type, (char *)&dqhead, | |
147 | sizeof(struct v2_disk_dqheader), 0); | |
1da177e4 LT |
148 | if (size != sizeof(struct v2_disk_dqheader)) |
149 | return 1; /* Probably not new format */ | |
150 | if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type]) | |
151 | return 1; /* Definitely not new format */ | |
268157ba JK |
152 | printk(KERN_INFO |
153 | "VFS: %s: Refusing to turn on old quota format on given file." | |
154 | " It probably contains newer quota format.\n", sb->s_id); | |
1da177e4 LT |
155 | return 0; /* Seems like a new format file -> refuse it */ |
156 | } | |
157 | ||
158 | static int v1_read_file_info(struct super_block *sb, int type) | |
159 | { | |
160 | struct quota_info *dqopt = sb_dqopt(sb); | |
161 | struct v1_disk_dqblk dqblk; | |
162 | int ret; | |
163 | ||
42fdb858 | 164 | down_read(&dqopt->dqio_sem); |
268157ba JK |
165 | ret = sb->s_op->quota_read(sb, type, (char *)&dqblk, |
166 | sizeof(struct v1_disk_dqblk), v1_dqoff(0)); | |
167 | if (ret != sizeof(struct v1_disk_dqblk)) { | |
1da177e4 LT |
168 | if (ret >= 0) |
169 | ret = -EIO; | |
170 | goto out; | |
171 | } | |
172 | ret = 0; | |
338bf9af | 173 | /* limits are stored as unsigned 32-bit data */ |
b10a0819 JK |
174 | dqopt->info[type].dqi_max_spc_limit = 0xffffffffULL << QUOTABLOCK_BITS; |
175 | dqopt->info[type].dqi_max_ino_limit = 0xffffffff; | |
268157ba JK |
176 | dqopt->info[type].dqi_igrace = |
177 | dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME; | |
178 | dqopt->info[type].dqi_bgrace = | |
179 | dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME; | |
1da177e4 | 180 | out: |
42fdb858 | 181 | up_read(&dqopt->dqio_sem); |
1da177e4 LT |
182 | return ret; |
183 | } | |
184 | ||
185 | static int v1_write_file_info(struct super_block *sb, int type) | |
186 | { | |
187 | struct quota_info *dqopt = sb_dqopt(sb); | |
188 | struct v1_disk_dqblk dqblk; | |
189 | int ret; | |
190 | ||
9a8ae30e | 191 | down_write(&dqopt->dqio_sem); |
1da177e4 | 192 | dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY; |
268157ba JK |
193 | ret = sb->s_op->quota_read(sb, type, (char *)&dqblk, |
194 | sizeof(struct v1_disk_dqblk), v1_dqoff(0)); | |
195 | if (ret != sizeof(struct v1_disk_dqblk)) { | |
1da177e4 LT |
196 | if (ret >= 0) |
197 | ret = -EIO; | |
198 | goto out; | |
199 | } | |
200 | dqblk.dqb_itime = dqopt->info[type].dqi_igrace; | |
201 | dqblk.dqb_btime = dqopt->info[type].dqi_bgrace; | |
202 | ret = sb->s_op->quota_write(sb, type, (char *)&dqblk, | |
203 | sizeof(struct v1_disk_dqblk), v1_dqoff(0)); | |
204 | if (ret == sizeof(struct v1_disk_dqblk)) | |
205 | ret = 0; | |
206 | else if (ret > 0) | |
207 | ret = -EIO; | |
208 | out: | |
9a8ae30e | 209 | up_write(&dqopt->dqio_sem); |
1da177e4 LT |
210 | return ret; |
211 | } | |
212 | ||
1472da5f | 213 | static const struct quota_format_ops v1_format_ops = { |
1da177e4 LT |
214 | .check_quota_file = v1_check_quota_file, |
215 | .read_file_info = v1_read_file_info, | |
216 | .write_file_info = v1_write_file_info, | |
217 | .free_file_info = NULL, | |
218 | .read_dqblk = v1_read_dqblk, | |
219 | .commit_dqblk = v1_commit_dqblk, | |
220 | }; | |
221 | ||
222 | static struct quota_format_type v1_quota_format = { | |
223 | .qf_fmt_id = QFMT_VFS_OLD, | |
224 | .qf_ops = &v1_format_ops, | |
225 | .qf_owner = THIS_MODULE | |
226 | }; | |
227 | ||
228 | static int __init init_v1_quota_format(void) | |
229 | { | |
230 | return register_quota_format(&v1_quota_format); | |
231 | } | |
232 | ||
233 | static void __exit exit_v1_quota_format(void) | |
234 | { | |
235 | unregister_quota_format(&v1_quota_format); | |
236 | } | |
237 | ||
238 | module_init(init_v1_quota_format); | |
239 | module_exit(exit_v1_quota_format); | |
240 |