Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * vfsv0 quota IO operations on file | |
3 | */ | |
4 | ||
5 | #include <linux/errno.h> | |
6 | #include <linux/fs.h> | |
7 | #include <linux/mount.h> | |
8 | #include <linux/dqblk_v2.h> | |
1da177e4 LT |
9 | #include <linux/kernel.h> |
10 | #include <linux/init.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/slab.h> | |
74abb989 | 13 | #include <linux/quotaops.h> |
1da177e4 LT |
14 | |
15 | #include <asm/byteorder.h> | |
16 | ||
1ccd14b9 | 17 | #include "quota_tree.h" |
cf770c13 JK |
18 | #include "quotaio_v2.h" |
19 | ||
1da177e4 LT |
20 | MODULE_AUTHOR("Jan Kara"); |
21 | MODULE_DESCRIPTION("Quota format v2 support"); | |
22 | MODULE_LICENSE("GPL"); | |
23 | ||
24 | #define __QUOTA_V2_PARANOIA | |
25 | ||
498c6015 JK |
26 | static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot); |
27 | static void v2r0_disk2memdqb(struct dquot *dquot, void *dp); | |
28 | static int v2r0_is_id(void *dp, struct dquot *dquot); | |
29 | static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot); | |
30 | static void v2r1_disk2memdqb(struct dquot *dquot, void *dp); | |
31 | static int v2r1_is_id(void *dp, struct dquot *dquot); | |
32 | ||
33 | static struct qtree_fmt_operations v2r0_qtree_ops = { | |
34 | .mem2disk_dqblk = v2r0_mem2diskdqb, | |
35 | .disk2mem_dqblk = v2r0_disk2memdqb, | |
36 | .is_id = v2r0_is_id, | |
37 | }; | |
38 | ||
39 | static struct qtree_fmt_operations v2r1_qtree_ops = { | |
40 | .mem2disk_dqblk = v2r1_mem2diskdqb, | |
41 | .disk2mem_dqblk = v2r1_disk2memdqb, | |
42 | .is_id = v2r1_is_id, | |
1ccd14b9 | 43 | }; |
1da177e4 | 44 | |
12095460 JK |
45 | #define QUOTABLOCK_BITS 10 |
46 | #define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS) | |
47 | ||
48 | static inline qsize_t v2_stoqb(qsize_t space) | |
49 | { | |
50 | return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS; | |
51 | } | |
52 | ||
53 | static inline qsize_t v2_qbtos(qsize_t blocks) | |
54 | { | |
55 | return blocks << QUOTABLOCK_BITS; | |
56 | } | |
57 | ||
498c6015 JK |
58 | static int v2_read_header(struct super_block *sb, int type, |
59 | struct v2_disk_dqheader *dqhead) | |
60 | { | |
61 | ssize_t size; | |
62 | ||
63 | size = sb->s_op->quota_read(sb, type, (char *)dqhead, | |
64 | sizeof(struct v2_disk_dqheader), 0); | |
65 | if (size != sizeof(struct v2_disk_dqheader)) { | |
66 | printk(KERN_WARNING "quota_v2: Failed header read:" | |
67 | " expected=%zd got=%zd\n", | |
68 | sizeof(struct v2_disk_dqheader), size); | |
69 | return 0; | |
70 | } | |
71 | return 1; | |
72 | } | |
73 | ||
1da177e4 LT |
74 | /* Check whether given file is really vfsv0 quotafile */ |
75 | static int v2_check_quota_file(struct super_block *sb, int type) | |
76 | { | |
77 | struct v2_disk_dqheader dqhead; | |
1da177e4 LT |
78 | static const uint quota_magics[] = V2_INITQMAGICS; |
79 | static const uint quota_versions[] = V2_INITQVERSIONS; | |
80 | ||
498c6015 | 81 | if (!v2_read_header(sb, type, &dqhead)) |
1da177e4 | 82 | return 0; |
1da177e4 | 83 | if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] || |
498c6015 | 84 | le32_to_cpu(dqhead.dqh_version) > quota_versions[type]) |
1da177e4 LT |
85 | return 0; |
86 | return 1; | |
87 | } | |
88 | ||
89 | /* Read information header from quota file */ | |
90 | static int v2_read_file_info(struct super_block *sb, int type) | |
91 | { | |
92 | struct v2_disk_dqinfo dinfo; | |
498c6015 | 93 | struct v2_disk_dqheader dqhead; |
1ccd14b9 | 94 | struct mem_dqinfo *info = sb_dqinfo(sb, type); |
e3d4d56b | 95 | struct qtree_mem_dqinfo *qinfo; |
1da177e4 | 96 | ssize_t size; |
498c6015 JK |
97 | unsigned int version; |
98 | ||
99 | if (!v2_read_header(sb, type, &dqhead)) | |
869835df | 100 | return -1; |
498c6015 | 101 | version = le32_to_cpu(dqhead.dqh_version); |
869835df JK |
102 | if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) || |
103 | (info->dqi_fmt_id == QFMT_VFS_V1 && version != 1)) | |
104 | return -1; | |
1da177e4 LT |
105 | |
106 | size = sb->s_op->quota_read(sb, type, (char *)&dinfo, | |
107 | sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); | |
108 | if (size != sizeof(struct v2_disk_dqinfo)) { | |
498c6015 | 109 | printk(KERN_WARNING "quota_v2: Can't read info structure on device %s.\n", |
1da177e4 LT |
110 | sb->s_id); |
111 | return -1; | |
112 | } | |
e3d4d56b JK |
113 | info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS); |
114 | if (!info->dqi_priv) { | |
115 | printk(KERN_WARNING | |
116 | "Not enough memory for quota information structure.\n"); | |
117 | return -1; | |
118 | } | |
119 | qinfo = info->dqi_priv; | |
498c6015 JK |
120 | if (version == 0) { |
121 | /* limits are stored as unsigned 32-bit data */ | |
122 | info->dqi_maxblimit = 0xffffffff; | |
123 | info->dqi_maxilimit = 0xffffffff; | |
124 | } else { | |
125 | /* used space is stored as unsigned 64-bit value */ | |
82fdfa92 JK |
126 | info->dqi_maxblimit = 0xffffffffffffffffULL; /* 2^64-1 */ |
127 | info->dqi_maxilimit = 0xffffffffffffffffULL; | |
498c6015 | 128 | } |
1da177e4 LT |
129 | info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); |
130 | info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); | |
131 | info->dqi_flags = le32_to_cpu(dinfo.dqi_flags); | |
e3d4d56b JK |
132 | qinfo->dqi_sb = sb; |
133 | qinfo->dqi_type = type; | |
134 | qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); | |
135 | qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); | |
136 | qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); | |
137 | qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS; | |
138 | qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS; | |
139 | qinfo->dqi_qtree_depth = qtree_depth(qinfo); | |
498c6015 JK |
140 | if (version == 0) { |
141 | qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk); | |
142 | qinfo->dqi_ops = &v2r0_qtree_ops; | |
143 | } else { | |
144 | qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk); | |
145 | qinfo->dqi_ops = &v2r1_qtree_ops; | |
146 | } | |
1da177e4 LT |
147 | return 0; |
148 | } | |
149 | ||
150 | /* Write information header to quota file */ | |
151 | static int v2_write_file_info(struct super_block *sb, int type) | |
152 | { | |
153 | struct v2_disk_dqinfo dinfo; | |
1ccd14b9 | 154 | struct mem_dqinfo *info = sb_dqinfo(sb, type); |
e3d4d56b | 155 | struct qtree_mem_dqinfo *qinfo = info->dqi_priv; |
1da177e4 LT |
156 | ssize_t size; |
157 | ||
158 | spin_lock(&dq_data_lock); | |
159 | info->dqi_flags &= ~DQF_INFO_DIRTY; | |
160 | dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); | |
161 | dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); | |
162 | dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK); | |
163 | spin_unlock(&dq_data_lock); | |
e3d4d56b JK |
164 | dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks); |
165 | dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk); | |
166 | dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry); | |
1da177e4 LT |
167 | size = sb->s_op->quota_write(sb, type, (char *)&dinfo, |
168 | sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); | |
169 | if (size != sizeof(struct v2_disk_dqinfo)) { | |
170 | printk(KERN_WARNING "Can't write info structure on device %s.\n", | |
171 | sb->s_id); | |
172 | return -1; | |
173 | } | |
174 | return 0; | |
175 | } | |
176 | ||
498c6015 | 177 | static void v2r0_disk2memdqb(struct dquot *dquot, void *dp) |
1da177e4 | 178 | { |
498c6015 | 179 | struct v2r0_disk_dqblk *d = dp, empty; |
1ccd14b9 JK |
180 | struct mem_dqblk *m = &dquot->dq_dqb; |
181 | ||
1da177e4 LT |
182 | m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit); |
183 | m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit); | |
184 | m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes); | |
185 | m->dqb_itime = le64_to_cpu(d->dqb_itime); | |
12095460 JK |
186 | m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit)); |
187 | m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit)); | |
1da177e4 LT |
188 | m->dqb_curspace = le64_to_cpu(d->dqb_curspace); |
189 | m->dqb_btime = le64_to_cpu(d->dqb_btime); | |
1ccd14b9 | 190 | /* We need to escape back all-zero structure */ |
498c6015 | 191 | memset(&empty, 0, sizeof(struct v2r0_disk_dqblk)); |
1ccd14b9 | 192 | empty.dqb_itime = cpu_to_le64(1); |
498c6015 | 193 | if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk))) |
1ccd14b9 | 194 | m->dqb_itime = 0; |
1da177e4 LT |
195 | } |
196 | ||
498c6015 | 197 | static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot) |
1da177e4 | 198 | { |
498c6015 | 199 | struct v2r0_disk_dqblk *d = dp; |
1ccd14b9 JK |
200 | struct mem_dqblk *m = &dquot->dq_dqb; |
201 | struct qtree_mem_dqinfo *info = | |
e3d4d56b | 202 | sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; |
1ccd14b9 | 203 | |
1da177e4 LT |
204 | d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit); |
205 | d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit); | |
206 | d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes); | |
207 | d->dqb_itime = cpu_to_le64(m->dqb_itime); | |
cf770c13 JK |
208 | d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit)); |
209 | d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit)); | |
1da177e4 LT |
210 | d->dqb_curspace = cpu_to_le64(m->dqb_curspace); |
211 | d->dqb_btime = cpu_to_le64(m->dqb_btime); | |
1ccd14b9 JK |
212 | d->dqb_id = cpu_to_le32(dquot->dq_id); |
213 | if (qtree_entry_unused(info, dp)) | |
214 | d->dqb_itime = cpu_to_le64(1); | |
1da177e4 LT |
215 | } |
216 | ||
498c6015 JK |
217 | static int v2r0_is_id(void *dp, struct dquot *dquot) |
218 | { | |
219 | struct v2r0_disk_dqblk *d = dp; | |
220 | struct qtree_mem_dqinfo *info = | |
221 | sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; | |
222 | ||
223 | if (qtree_entry_unused(info, dp)) | |
224 | return 0; | |
225 | return le32_to_cpu(d->dqb_id) == dquot->dq_id; | |
226 | } | |
227 | ||
228 | static void v2r1_disk2memdqb(struct dquot *dquot, void *dp) | |
229 | { | |
230 | struct v2r1_disk_dqblk *d = dp, empty; | |
231 | struct mem_dqblk *m = &dquot->dq_dqb; | |
232 | ||
233 | m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit); | |
234 | m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit); | |
235 | m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes); | |
236 | m->dqb_itime = le64_to_cpu(d->dqb_itime); | |
237 | m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit)); | |
238 | m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit)); | |
239 | m->dqb_curspace = le64_to_cpu(d->dqb_curspace); | |
240 | m->dqb_btime = le64_to_cpu(d->dqb_btime); | |
241 | /* We need to escape back all-zero structure */ | |
242 | memset(&empty, 0, sizeof(struct v2r1_disk_dqblk)); | |
243 | empty.dqb_itime = cpu_to_le64(1); | |
244 | if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk))) | |
245 | m->dqb_itime = 0; | |
246 | } | |
247 | ||
248 | static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot) | |
249 | { | |
250 | struct v2r1_disk_dqblk *d = dp; | |
251 | struct mem_dqblk *m = &dquot->dq_dqb; | |
252 | struct qtree_mem_dqinfo *info = | |
253 | sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; | |
254 | ||
255 | d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit); | |
256 | d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit); | |
257 | d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes); | |
258 | d->dqb_itime = cpu_to_le64(m->dqb_itime); | |
259 | d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit)); | |
260 | d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit)); | |
261 | d->dqb_curspace = cpu_to_le64(m->dqb_curspace); | |
262 | d->dqb_btime = cpu_to_le64(m->dqb_btime); | |
263 | d->dqb_id = cpu_to_le32(dquot->dq_id); | |
264 | if (qtree_entry_unused(info, dp)) | |
265 | d->dqb_itime = cpu_to_le64(1); | |
266 | } | |
267 | ||
268 | static int v2r1_is_id(void *dp, struct dquot *dquot) | |
1da177e4 | 269 | { |
498c6015 | 270 | struct v2r1_disk_dqblk *d = dp; |
1ccd14b9 | 271 | struct qtree_mem_dqinfo *info = |
e3d4d56b | 272 | sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; |
1da177e4 | 273 | |
1ccd14b9 | 274 | if (qtree_entry_unused(info, dp)) |
1da177e4 | 275 | return 0; |
1ccd14b9 | 276 | return le32_to_cpu(d->dqb_id) == dquot->dq_id; |
1da177e4 LT |
277 | } |
278 | ||
1ccd14b9 | 279 | static int v2_read_dquot(struct dquot *dquot) |
1da177e4 | 280 | { |
e3d4d56b | 281 | return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); |
1da177e4 LT |
282 | } |
283 | ||
1da177e4 LT |
284 | static int v2_write_dquot(struct dquot *dquot) |
285 | { | |
e3d4d56b | 286 | return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); |
1da177e4 LT |
287 | } |
288 | ||
1da177e4 LT |
289 | static int v2_release_dquot(struct dquot *dquot) |
290 | { | |
e3d4d56b JK |
291 | return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); |
292 | } | |
293 | ||
294 | static int v2_free_file_info(struct super_block *sb, int type) | |
295 | { | |
296 | kfree(sb_dqinfo(sb, type)->dqi_priv); | |
297 | return 0; | |
1da177e4 LT |
298 | } |
299 | ||
1472da5f | 300 | static const struct quota_format_ops v2_format_ops = { |
1da177e4 LT |
301 | .check_quota_file = v2_check_quota_file, |
302 | .read_file_info = v2_read_file_info, | |
303 | .write_file_info = v2_write_file_info, | |
e3d4d56b | 304 | .free_file_info = v2_free_file_info, |
1da177e4 LT |
305 | .read_dqblk = v2_read_dquot, |
306 | .commit_dqblk = v2_write_dquot, | |
307 | .release_dqblk = v2_release_dquot, | |
308 | }; | |
309 | ||
498c6015 | 310 | static struct quota_format_type v2r0_quota_format = { |
1da177e4 LT |
311 | .qf_fmt_id = QFMT_VFS_V0, |
312 | .qf_ops = &v2_format_ops, | |
313 | .qf_owner = THIS_MODULE | |
314 | }; | |
315 | ||
498c6015 JK |
316 | static struct quota_format_type v2r1_quota_format = { |
317 | .qf_fmt_id = QFMT_VFS_V1, | |
318 | .qf_ops = &v2_format_ops, | |
319 | .qf_owner = THIS_MODULE | |
320 | }; | |
321 | ||
1da177e4 LT |
322 | static int __init init_v2_quota_format(void) |
323 | { | |
498c6015 JK |
324 | int ret; |
325 | ||
326 | ret = register_quota_format(&v2r0_quota_format); | |
327 | if (ret) | |
328 | return ret; | |
329 | return register_quota_format(&v2r1_quota_format); | |
1da177e4 LT |
330 | } |
331 | ||
332 | static void __exit exit_v2_quota_format(void) | |
333 | { | |
498c6015 JK |
334 | unregister_quota_format(&v2r0_quota_format); |
335 | unregister_quota_format(&v2r1_quota_format); | |
1da177e4 LT |
336 | } |
337 | ||
338 | module_init(init_v2_quota_format); | |
339 | module_exit(exit_v2_quota_format); |