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