Commit | Line | Data |
---|---|---|
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 | { | |
57 | int type = dquot->dq_type; | |
58 | struct v1_disk_dqblk dqblk; | |
59 | ||
60 | if (!sb_dqopt(dquot->dq_sb)->files[type]) | |
61 | return -EINVAL; | |
62 | ||
63 | /* Set structure to 0s in case read fails/is after end of file */ | |
64 | memset(&dqblk, 0, sizeof(struct v1_disk_dqblk)); | |
268157ba JK |
65 | dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk, |
66 | sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id)); | |
1da177e4 LT |
67 | |
68 | v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk); | |
268157ba JK |
69 | if (dquot->dq_dqb.dqb_bhardlimit == 0 && |
70 | dquot->dq_dqb.dqb_bsoftlimit == 0 && | |
71 | dquot->dq_dqb.dqb_ihardlimit == 0 && | |
72 | dquot->dq_dqb.dqb_isoftlimit == 0) | |
1da177e4 | 73 | set_bit(DQ_FAKE_B, &dquot->dq_flags); |
dde95888 | 74 | dqstats_inc(DQST_READS); |
1da177e4 LT |
75 | |
76 | return 0; | |
77 | } | |
78 | ||
79 | static int v1_commit_dqblk(struct dquot *dquot) | |
80 | { | |
81 | short type = dquot->dq_type; | |
82 | ssize_t ret; | |
83 | struct v1_disk_dqblk dqblk; | |
84 | ||
85 | v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb); | |
86 | if (dquot->dq_id == 0) { | |
268157ba JK |
87 | dqblk.dqb_btime = |
88 | sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace; | |
89 | dqblk.dqb_itime = | |
90 | sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace; | |
1da177e4 LT |
91 | } |
92 | ret = 0; | |
93 | if (sb_dqopt(dquot->dq_sb)->files[type]) | |
268157ba JK |
94 | ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type, |
95 | (char *)&dqblk, sizeof(struct v1_disk_dqblk), | |
96 | v1_dqoff(dquot->dq_id)); | |
1da177e4 | 97 | if (ret != sizeof(struct v1_disk_dqblk)) { |
fb5ffb0e | 98 | quota_error(dquot->dq_sb, "dquota write failed"); |
1da177e4 LT |
99 | if (ret >= 0) |
100 | ret = -EIO; | |
101 | goto out; | |
102 | } | |
103 | ret = 0; | |
104 | ||
105 | out: | |
dde95888 | 106 | dqstats_inc(DQST_WRITES); |
1da177e4 LT |
107 | |
108 | return ret; | |
109 | } | |
110 | ||
111 | /* Magics of new quota format */ | |
112 | #define V2_INITQMAGICS {\ | |
113 | 0xd9c01f11, /* USRQUOTA */\ | |
114 | 0xd9c01927 /* GRPQUOTA */\ | |
115 | } | |
116 | ||
117 | /* Header of new quota format */ | |
118 | struct v2_disk_dqheader { | |
119 | __le32 dqh_magic; /* Magic number identifying file */ | |
120 | __le32 dqh_version; /* File version */ | |
121 | }; | |
122 | ||
123 | static int v1_check_quota_file(struct super_block *sb, int type) | |
124 | { | |
125 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
126 | ulong blocks; | |
127 | size_t off; | |
128 | struct v2_disk_dqheader dqhead; | |
129 | ssize_t size; | |
130 | loff_t isize; | |
131 | static const uint quota_magics[] = V2_INITQMAGICS; | |
132 | ||
133 | isize = i_size_read(inode); | |
134 | if (!isize) | |
135 | return 0; | |
136 | blocks = isize >> BLOCK_SIZE_BITS; | |
137 | off = isize & (BLOCK_SIZE - 1); | |
268157ba JK |
138 | if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) % |
139 | sizeof(struct v1_disk_dqblk)) | |
1da177e4 | 140 | return 0; |
268157ba JK |
141 | /* Doublecheck whether we didn't get file with new format - with old |
142 | * quotactl() this could happen */ | |
143 | size = sb->s_op->quota_read(sb, type, (char *)&dqhead, | |
144 | sizeof(struct v2_disk_dqheader), 0); | |
1da177e4 LT |
145 | if (size != sizeof(struct v2_disk_dqheader)) |
146 | return 1; /* Probably not new format */ | |
147 | if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type]) | |
148 | return 1; /* Definitely not new format */ | |
268157ba JK |
149 | printk(KERN_INFO |
150 | "VFS: %s: Refusing to turn on old quota format on given file." | |
151 | " It probably contains newer quota format.\n", sb->s_id); | |
1da177e4 LT |
152 | return 0; /* Seems like a new format file -> refuse it */ |
153 | } | |
154 | ||
155 | static int v1_read_file_info(struct super_block *sb, int type) | |
156 | { | |
157 | struct quota_info *dqopt = sb_dqopt(sb); | |
158 | struct v1_disk_dqblk dqblk; | |
159 | int ret; | |
160 | ||
268157ba JK |
161 | ret = sb->s_op->quota_read(sb, type, (char *)&dqblk, |
162 | sizeof(struct v1_disk_dqblk), v1_dqoff(0)); | |
163 | if (ret != sizeof(struct v1_disk_dqblk)) { | |
1da177e4 LT |
164 | if (ret >= 0) |
165 | ret = -EIO; | |
166 | goto out; | |
167 | } | |
168 | ret = 0; | |
338bf9af AP |
169 | /* limits are stored as unsigned 32-bit data */ |
170 | dqopt->info[type].dqi_maxblimit = 0xffffffff; | |
171 | dqopt->info[type].dqi_maxilimit = 0xffffffff; | |
268157ba JK |
172 | dqopt->info[type].dqi_igrace = |
173 | dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME; | |
174 | dqopt->info[type].dqi_bgrace = | |
175 | dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME; | |
1da177e4 LT |
176 | out: |
177 | return ret; | |
178 | } | |
179 | ||
180 | static int v1_write_file_info(struct super_block *sb, int type) | |
181 | { | |
182 | struct quota_info *dqopt = sb_dqopt(sb); | |
183 | struct v1_disk_dqblk dqblk; | |
184 | int ret; | |
185 | ||
186 | dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY; | |
268157ba JK |
187 | ret = sb->s_op->quota_read(sb, type, (char *)&dqblk, |
188 | sizeof(struct v1_disk_dqblk), v1_dqoff(0)); | |
189 | if (ret != sizeof(struct v1_disk_dqblk)) { | |
1da177e4 LT |
190 | if (ret >= 0) |
191 | ret = -EIO; | |
192 | goto out; | |
193 | } | |
194 | dqblk.dqb_itime = dqopt->info[type].dqi_igrace; | |
195 | dqblk.dqb_btime = dqopt->info[type].dqi_bgrace; | |
196 | ret = sb->s_op->quota_write(sb, type, (char *)&dqblk, | |
197 | sizeof(struct v1_disk_dqblk), v1_dqoff(0)); | |
198 | if (ret == sizeof(struct v1_disk_dqblk)) | |
199 | ret = 0; | |
200 | else if (ret > 0) | |
201 | ret = -EIO; | |
202 | out: | |
203 | return ret; | |
204 | } | |
205 | ||
1472da5f | 206 | static const struct quota_format_ops v1_format_ops = { |
1da177e4 LT |
207 | .check_quota_file = v1_check_quota_file, |
208 | .read_file_info = v1_read_file_info, | |
209 | .write_file_info = v1_write_file_info, | |
210 | .free_file_info = NULL, | |
211 | .read_dqblk = v1_read_dqblk, | |
212 | .commit_dqblk = v1_commit_dqblk, | |
213 | }; | |
214 | ||
215 | static struct quota_format_type v1_quota_format = { | |
216 | .qf_fmt_id = QFMT_VFS_OLD, | |
217 | .qf_ops = &v1_format_ops, | |
218 | .qf_owner = THIS_MODULE | |
219 | }; | |
220 | ||
221 | static int __init init_v1_quota_format(void) | |
222 | { | |
223 | return register_quota_format(&v1_quota_format); | |
224 | } | |
225 | ||
226 | static void __exit exit_v1_quota_format(void) | |
227 | { | |
228 | unregister_quota_format(&v1_quota_format); | |
229 | } | |
230 | ||
231 | module_init(init_v1_quota_format); | |
232 | module_exit(exit_v1_quota_format); | |
233 |