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Commit | Line | Data |
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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 | ||
d1b98c23 | 33 | static const struct qtree_fmt_operations v2r0_qtree_ops = { |
498c6015 JK |
34 | .mem2disk_dqblk = v2r0_mem2diskdqb, |
35 | .disk2mem_dqblk = v2r0_disk2memdqb, | |
36 | .is_id = v2r0_is_id, | |
37 | }; | |
38 | ||
d1b98c23 | 39 | static const struct qtree_fmt_operations v2r1_qtree_ops = { |
498c6015 JK |
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)) { | |
fb5ffb0e JZ |
66 | quota_error(sb, "Failed header read: expected=%zd got=%zd", |
67 | sizeof(struct v2_disk_dqheader), size); | |
498c6015 JK |
68 | return 0; |
69 | } | |
70 | return 1; | |
71 | } | |
72 | ||
1da177e4 LT |
73 | /* Check whether given file is really vfsv0 quotafile */ |
74 | static int v2_check_quota_file(struct super_block *sb, int type) | |
75 | { | |
76 | struct v2_disk_dqheader dqhead; | |
1da177e4 LT |
77 | static const uint quota_magics[] = V2_INITQMAGICS; |
78 | static const uint quota_versions[] = V2_INITQVERSIONS; | |
79 | ||
498c6015 | 80 | if (!v2_read_header(sb, type, &dqhead)) |
1da177e4 | 81 | return 0; |
1da177e4 | 82 | if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] || |
498c6015 | 83 | le32_to_cpu(dqhead.dqh_version) > quota_versions[type]) |
1da177e4 LT |
84 | return 0; |
85 | return 1; | |
86 | } | |
87 | ||
88 | /* Read information header from quota file */ | |
89 | static int v2_read_file_info(struct super_block *sb, int type) | |
90 | { | |
91 | struct v2_disk_dqinfo dinfo; | |
498c6015 | 92 | struct v2_disk_dqheader dqhead; |
42fdb858 JK |
93 | struct quota_info *dqopt = sb_dqopt(sb); |
94 | struct mem_dqinfo *info = &dqopt->info[type]; | |
e3d4d56b | 95 | struct qtree_mem_dqinfo *qinfo; |
1da177e4 | 96 | ssize_t size; |
498c6015 | 97 | unsigned int version; |
42fdb858 | 98 | int ret; |
498c6015 | 99 | |
42fdb858 JK |
100 | down_read(&dqopt->dqio_sem); |
101 | if (!v2_read_header(sb, type, &dqhead)) { | |
cb8d01b4 | 102 | ret = -EIO; |
42fdb858 JK |
103 | goto out; |
104 | } | |
498c6015 | 105 | version = le32_to_cpu(dqhead.dqh_version); |
869835df | 106 | if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) || |
42fdb858 | 107 | (info->dqi_fmt_id == QFMT_VFS_V1 && version != 1)) { |
cb8d01b4 | 108 | ret = -EINVAL; |
42fdb858 JK |
109 | goto out; |
110 | } | |
1da177e4 LT |
111 | |
112 | size = sb->s_op->quota_read(sb, type, (char *)&dinfo, | |
113 | sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); | |
114 | if (size != sizeof(struct v2_disk_dqinfo)) { | |
fb5ffb0e | 115 | quota_error(sb, "Can't read info structure"); |
cb8d01b4 | 116 | ret = -EIO; |
42fdb858 | 117 | goto out; |
1da177e4 | 118 | } |
e3d4d56b JK |
119 | info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS); |
120 | if (!info->dqi_priv) { | |
121 | printk(KERN_WARNING | |
122 | "Not enough memory for quota information structure.\n"); | |
42fdb858 JK |
123 | ret = -ENOMEM; |
124 | goto out; | |
e3d4d56b JK |
125 | } |
126 | qinfo = info->dqi_priv; | |
498c6015 JK |
127 | if (version == 0) { |
128 | /* limits are stored as unsigned 32-bit data */ | |
7e08da50 | 129 | info->dqi_max_spc_limit = 0xffffffffLL << QUOTABLOCK_BITS; |
b10a0819 | 130 | info->dqi_max_ino_limit = 0xffffffff; |
498c6015 | 131 | } else { |
7e08da50 JK |
132 | /* |
133 | * Used space is stored as unsigned 64-bit value in bytes but | |
134 | * quota core supports only signed 64-bit values so use that | |
135 | * as a limit | |
136 | */ | |
137 | info->dqi_max_spc_limit = 0x7fffffffffffffffLL; /* 2^63-1 */ | |
138 | info->dqi_max_ino_limit = 0x7fffffffffffffffLL; | |
498c6015 | 139 | } |
1da177e4 LT |
140 | info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); |
141 | info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); | |
c119c5b9 JK |
142 | /* No flags currently supported */ |
143 | info->dqi_flags = 0; | |
e3d4d56b JK |
144 | qinfo->dqi_sb = sb; |
145 | qinfo->dqi_type = type; | |
146 | qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); | |
147 | qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); | |
148 | qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); | |
149 | qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS; | |
150 | qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS; | |
151 | qinfo->dqi_qtree_depth = qtree_depth(qinfo); | |
498c6015 JK |
152 | if (version == 0) { |
153 | qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk); | |
154 | qinfo->dqi_ops = &v2r0_qtree_ops; | |
155 | } else { | |
156 | qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk); | |
157 | qinfo->dqi_ops = &v2r1_qtree_ops; | |
158 | } | |
42fdb858 JK |
159 | ret = 0; |
160 | out: | |
161 | up_read(&dqopt->dqio_sem); | |
162 | return ret; | |
1da177e4 LT |
163 | } |
164 | ||
165 | /* Write information header to quota file */ | |
166 | static int v2_write_file_info(struct super_block *sb, int type) | |
167 | { | |
168 | struct v2_disk_dqinfo dinfo; | |
9a8ae30e JK |
169 | struct quota_info *dqopt = sb_dqopt(sb); |
170 | struct mem_dqinfo *info = &dqopt->info[type]; | |
e3d4d56b | 171 | struct qtree_mem_dqinfo *qinfo = info->dqi_priv; |
1da177e4 LT |
172 | ssize_t size; |
173 | ||
9a8ae30e | 174 | down_write(&dqopt->dqio_sem); |
1da177e4 LT |
175 | spin_lock(&dq_data_lock); |
176 | info->dqi_flags &= ~DQF_INFO_DIRTY; | |
177 | dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); | |
178 | dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); | |
c119c5b9 JK |
179 | /* No flags currently supported */ |
180 | dinfo.dqi_flags = cpu_to_le32(0); | |
1da177e4 | 181 | spin_unlock(&dq_data_lock); |
e3d4d56b JK |
182 | dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks); |
183 | dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk); | |
184 | dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry); | |
1da177e4 LT |
185 | size = sb->s_op->quota_write(sb, type, (char *)&dinfo, |
186 | sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); | |
9a8ae30e | 187 | up_write(&dqopt->dqio_sem); |
1da177e4 | 188 | if (size != sizeof(struct v2_disk_dqinfo)) { |
fb5ffb0e | 189 | quota_error(sb, "Can't write info structure"); |
1da177e4 LT |
190 | return -1; |
191 | } | |
192 | return 0; | |
193 | } | |
194 | ||
498c6015 | 195 | static void v2r0_disk2memdqb(struct dquot *dquot, void *dp) |
1da177e4 | 196 | { |
498c6015 | 197 | struct v2r0_disk_dqblk *d = dp, empty; |
1ccd14b9 JK |
198 | struct mem_dqblk *m = &dquot->dq_dqb; |
199 | ||
1da177e4 LT |
200 | m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit); |
201 | m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit); | |
202 | m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes); | |
203 | m->dqb_itime = le64_to_cpu(d->dqb_itime); | |
12095460 JK |
204 | m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit)); |
205 | m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit)); | |
1da177e4 LT |
206 | m->dqb_curspace = le64_to_cpu(d->dqb_curspace); |
207 | m->dqb_btime = le64_to_cpu(d->dqb_btime); | |
1ccd14b9 | 208 | /* We need to escape back all-zero structure */ |
498c6015 | 209 | memset(&empty, 0, sizeof(struct v2r0_disk_dqblk)); |
1ccd14b9 | 210 | empty.dqb_itime = cpu_to_le64(1); |
498c6015 | 211 | if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk))) |
1ccd14b9 | 212 | m->dqb_itime = 0; |
1da177e4 LT |
213 | } |
214 | ||
498c6015 | 215 | static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot) |
1da177e4 | 216 | { |
498c6015 | 217 | struct v2r0_disk_dqblk *d = dp; |
1ccd14b9 JK |
218 | struct mem_dqblk *m = &dquot->dq_dqb; |
219 | struct qtree_mem_dqinfo *info = | |
4c376dca | 220 | sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; |
1ccd14b9 | 221 | |
1da177e4 LT |
222 | d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit); |
223 | d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit); | |
224 | d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes); | |
225 | d->dqb_itime = cpu_to_le64(m->dqb_itime); | |
cf770c13 JK |
226 | d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit)); |
227 | d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit)); | |
1da177e4 LT |
228 | d->dqb_curspace = cpu_to_le64(m->dqb_curspace); |
229 | d->dqb_btime = cpu_to_le64(m->dqb_btime); | |
4c376dca | 230 | d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id)); |
1ccd14b9 JK |
231 | if (qtree_entry_unused(info, dp)) |
232 | d->dqb_itime = cpu_to_le64(1); | |
1da177e4 LT |
233 | } |
234 | ||
498c6015 JK |
235 | static int v2r0_is_id(void *dp, struct dquot *dquot) |
236 | { | |
237 | struct v2r0_disk_dqblk *d = dp; | |
238 | struct qtree_mem_dqinfo *info = | |
4c376dca | 239 | sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; |
498c6015 JK |
240 | |
241 | if (qtree_entry_unused(info, dp)) | |
242 | return 0; | |
4c376dca EB |
243 | return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type, |
244 | le32_to_cpu(d->dqb_id)), | |
245 | dquot->dq_id); | |
498c6015 JK |
246 | } |
247 | ||
248 | static void v2r1_disk2memdqb(struct dquot *dquot, void *dp) | |
249 | { | |
250 | struct v2r1_disk_dqblk *d = dp, empty; | |
251 | struct mem_dqblk *m = &dquot->dq_dqb; | |
252 | ||
253 | m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit); | |
254 | m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit); | |
255 | m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes); | |
256 | m->dqb_itime = le64_to_cpu(d->dqb_itime); | |
257 | m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit)); | |
258 | m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit)); | |
259 | m->dqb_curspace = le64_to_cpu(d->dqb_curspace); | |
260 | m->dqb_btime = le64_to_cpu(d->dqb_btime); | |
261 | /* We need to escape back all-zero structure */ | |
262 | memset(&empty, 0, sizeof(struct v2r1_disk_dqblk)); | |
263 | empty.dqb_itime = cpu_to_le64(1); | |
264 | if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk))) | |
265 | m->dqb_itime = 0; | |
266 | } | |
267 | ||
268 | static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot) | |
269 | { | |
270 | struct v2r1_disk_dqblk *d = dp; | |
271 | struct mem_dqblk *m = &dquot->dq_dqb; | |
272 | struct qtree_mem_dqinfo *info = | |
4c376dca | 273 | sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; |
498c6015 JK |
274 | |
275 | d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit); | |
276 | d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit); | |
277 | d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes); | |
278 | d->dqb_itime = cpu_to_le64(m->dqb_itime); | |
279 | d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit)); | |
280 | d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit)); | |
281 | d->dqb_curspace = cpu_to_le64(m->dqb_curspace); | |
282 | d->dqb_btime = cpu_to_le64(m->dqb_btime); | |
4c376dca | 283 | d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id)); |
498c6015 JK |
284 | if (qtree_entry_unused(info, dp)) |
285 | d->dqb_itime = cpu_to_le64(1); | |
286 | } | |
287 | ||
288 | static int v2r1_is_id(void *dp, struct dquot *dquot) | |
1da177e4 | 289 | { |
498c6015 | 290 | struct v2r1_disk_dqblk *d = dp; |
1ccd14b9 | 291 | struct qtree_mem_dqinfo *info = |
4c376dca | 292 | sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; |
1da177e4 | 293 | |
1ccd14b9 | 294 | if (qtree_entry_unused(info, dp)) |
1da177e4 | 295 | return 0; |
4c376dca EB |
296 | return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type, |
297 | le32_to_cpu(d->dqb_id)), | |
298 | dquot->dq_id); | |
1da177e4 LT |
299 | } |
300 | ||
1ccd14b9 | 301 | static int v2_read_dquot(struct dquot *dquot) |
1da177e4 | 302 | { |
e342e38d JK |
303 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
304 | int ret; | |
305 | ||
306 | down_read(&dqopt->dqio_sem); | |
307 | ret = qtree_read_dquot( | |
308 | sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, | |
309 | dquot); | |
310 | up_read(&dqopt->dqio_sem); | |
311 | return ret; | |
1da177e4 LT |
312 | } |
313 | ||
1da177e4 LT |
314 | static int v2_write_dquot(struct dquot *dquot) |
315 | { | |
8fc32c2b JK |
316 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
317 | int ret; | |
d2faa415 JK |
318 | bool alloc = false; |
319 | ||
320 | /* | |
321 | * If space for dquot is already allocated, we don't need any | |
322 | * protection as we'll only overwrite the place of dquot. We are | |
323 | * still protected by concurrent writes of the same dquot by | |
324 | * dquot->dq_lock. | |
325 | */ | |
326 | if (!dquot->dq_off) { | |
327 | alloc = true; | |
328 | down_write(&dqopt->dqio_sem); | |
329 | } | |
8fc32c2b JK |
330 | ret = qtree_write_dquot( |
331 | sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, | |
332 | dquot); | |
d2faa415 JK |
333 | if (alloc) |
334 | up_write(&dqopt->dqio_sem); | |
8fc32c2b | 335 | return ret; |
1da177e4 LT |
336 | } |
337 | ||
1da177e4 LT |
338 | static int v2_release_dquot(struct dquot *dquot) |
339 | { | |
b9a1a7f4 JK |
340 | struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); |
341 | int ret; | |
342 | ||
343 | down_write(&dqopt->dqio_sem); | |
344 | ret = qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot); | |
345 | up_write(&dqopt->dqio_sem); | |
346 | ||
347 | return ret; | |
e3d4d56b JK |
348 | } |
349 | ||
350 | static int v2_free_file_info(struct super_block *sb, int type) | |
351 | { | |
352 | kfree(sb_dqinfo(sb, type)->dqi_priv); | |
353 | return 0; | |
1da177e4 LT |
354 | } |
355 | ||
0066373d JK |
356 | static int v2_get_next_id(struct super_block *sb, struct kqid *qid) |
357 | { | |
f14618c6 JK |
358 | struct quota_info *dqopt = sb_dqopt(sb); |
359 | int ret; | |
360 | ||
361 | down_read(&dqopt->dqio_sem); | |
362 | ret = qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid); | |
363 | up_read(&dqopt->dqio_sem); | |
364 | return ret; | |
0066373d JK |
365 | } |
366 | ||
1472da5f | 367 | static const struct quota_format_ops v2_format_ops = { |
1da177e4 LT |
368 | .check_quota_file = v2_check_quota_file, |
369 | .read_file_info = v2_read_file_info, | |
370 | .write_file_info = v2_write_file_info, | |
e3d4d56b | 371 | .free_file_info = v2_free_file_info, |
1da177e4 LT |
372 | .read_dqblk = v2_read_dquot, |
373 | .commit_dqblk = v2_write_dquot, | |
374 | .release_dqblk = v2_release_dquot, | |
0066373d | 375 | .get_next_id = v2_get_next_id, |
1da177e4 LT |
376 | }; |
377 | ||
498c6015 | 378 | static struct quota_format_type v2r0_quota_format = { |
1da177e4 LT |
379 | .qf_fmt_id = QFMT_VFS_V0, |
380 | .qf_ops = &v2_format_ops, | |
381 | .qf_owner = THIS_MODULE | |
382 | }; | |
383 | ||
498c6015 JK |
384 | static struct quota_format_type v2r1_quota_format = { |
385 | .qf_fmt_id = QFMT_VFS_V1, | |
386 | .qf_ops = &v2_format_ops, | |
387 | .qf_owner = THIS_MODULE | |
388 | }; | |
389 | ||
1da177e4 LT |
390 | static int __init init_v2_quota_format(void) |
391 | { | |
498c6015 JK |
392 | int ret; |
393 | ||
394 | ret = register_quota_format(&v2r0_quota_format); | |
395 | if (ret) | |
396 | return ret; | |
397 | return register_quota_format(&v2r1_quota_format); | |
1da177e4 LT |
398 | } |
399 | ||
400 | static void __exit exit_v2_quota_format(void) | |
401 | { | |
498c6015 JK |
402 | unregister_quota_format(&v2r0_quota_format); |
403 | unregister_quota_format(&v2r1_quota_format); | |
1da177e4 LT |
404 | } |
405 | ||
406 | module_init(init_v2_quota_format); | |
407 | module_exit(exit_v2_quota_format); |