1 /*
2 * Implementation of new quotafile format
3 *
4 * Jan Kara <jack@suse.cz> - sponsored by SuSE CR
5 */
6
7 #include "config.h"
8 #include <sys/types.h>
9 #include <errno.h>
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <unistd.h>
14
15 #include "common.h"
16 #include "quotaio_v2.h"
17 #include "dqblk_v2.h"
18 #include "quotaio.h"
19 #include "quotaio_tree.h"
20
21 static int v2_check_file(struct quota_handle *h, int type, int fmt);
22 static int v2_init_io(struct quota_handle *h);
23 static int v2_new_io(struct quota_handle *h);
24 static int v2_write_info(struct quota_handle *h);
25 static struct dquot *v2_read_dquot(struct quota_handle *h, qid_t id);
26 static int v2_commit_dquot(struct dquot *dquot);
27 static int v2_scan_dquots(struct quota_handle *h,
28 int (*process_dquot) (struct dquot *dquot,
29 void *data),
30 void *data);
31 static int v2_report(struct quota_handle *h, int verbose);
32
33 struct quotafile_ops quotafile_ops_2 = {
34 .check_file = v2_check_file,
35 .init_io = v2_init_io,
36 .new_io = v2_new_io,
37 .write_info = v2_write_info,
38 .read_dquot = v2_read_dquot,
39 .commit_dquot = v2_commit_dquot,
40 .scan_dquots = v2_scan_dquots,
41 .report = v2_report,
42 };
43
44 /*
45 * Copy dquot from disk to memory
46 */
v2r1_disk2memdqblk(struct dquot * dquot,void * dp)47 static void v2r1_disk2memdqblk(struct dquot *dquot, void *dp)
48 {
49 struct util_dqblk *m = &dquot->dq_dqb;
50 struct v2r1_disk_dqblk *d = dp, empty;
51
52 dquot->dq_id = ext2fs_le32_to_cpu(d->dqb_id);
53 m->dqb_ihardlimit = ext2fs_le64_to_cpu(d->dqb_ihardlimit);
54 m->dqb_isoftlimit = ext2fs_le64_to_cpu(d->dqb_isoftlimit);
55 m->dqb_bhardlimit = ext2fs_le64_to_cpu(d->dqb_bhardlimit);
56 m->dqb_bsoftlimit = ext2fs_le64_to_cpu(d->dqb_bsoftlimit);
57 m->dqb_curinodes = ext2fs_le64_to_cpu(d->dqb_curinodes);
58 m->dqb_curspace = ext2fs_le64_to_cpu(d->dqb_curspace);
59 m->dqb_itime = ext2fs_le64_to_cpu(d->dqb_itime);
60 m->dqb_btime = ext2fs_le64_to_cpu(d->dqb_btime);
61
62 memset(&empty, 0, sizeof(struct v2r1_disk_dqblk));
63 empty.dqb_itime = ext2fs_cpu_to_le64(1);
64 if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk)))
65 m->dqb_itime = 0;
66 }
67
68 /*
69 * Copy dquot from memory to disk
70 */
v2r1_mem2diskdqblk(void * dp,struct dquot * dquot)71 static void v2r1_mem2diskdqblk(void *dp, struct dquot *dquot)
72 {
73 struct util_dqblk *m = &dquot->dq_dqb;
74 struct v2r1_disk_dqblk *d = dp;
75
76 d->dqb_ihardlimit = ext2fs_cpu_to_le64(m->dqb_ihardlimit);
77 d->dqb_isoftlimit = ext2fs_cpu_to_le64(m->dqb_isoftlimit);
78 d->dqb_bhardlimit = ext2fs_cpu_to_le64(m->dqb_bhardlimit);
79 d->dqb_bsoftlimit = ext2fs_cpu_to_le64(m->dqb_bsoftlimit);
80 d->dqb_curinodes = ext2fs_cpu_to_le64(m->dqb_curinodes);
81 d->dqb_curspace = ext2fs_cpu_to_le64(m->dqb_curspace);
82 d->dqb_itime = ext2fs_cpu_to_le64(m->dqb_itime);
83 d->dqb_btime = ext2fs_cpu_to_le64(m->dqb_btime);
84 d->dqb_id = ext2fs_cpu_to_le32(dquot->dq_id);
85 if (qtree_entry_unused(&dquot->dq_h->qh_info.u.v2_mdqi.dqi_qtree, dp))
86 d->dqb_itime = ext2fs_cpu_to_le64(1);
87 }
88
v2r1_is_id(void * dp,struct dquot * dquot)89 static int v2r1_is_id(void *dp, struct dquot *dquot)
90 {
91 struct v2r1_disk_dqblk *d = dp;
92 struct qtree_mem_dqinfo *info =
93 &dquot->dq_h->qh_info.u.v2_mdqi.dqi_qtree;
94
95 if (qtree_entry_unused(info, dp))
96 return 0;
97 return ext2fs_le32_to_cpu(d->dqb_id) == dquot->dq_id;
98 }
99
100 static struct qtree_fmt_operations v2r1_fmt_ops = {
101 .mem2disk_dqblk = v2r1_mem2diskdqblk,
102 .disk2mem_dqblk = v2r1_disk2memdqblk,
103 .is_id = v2r1_is_id,
104 };
105
106 /*
107 * Copy dqinfo from disk to memory
108 */
v2_disk2memdqinfo(struct util_dqinfo * m,struct v2_disk_dqinfo * d)109 static inline void v2_disk2memdqinfo(struct util_dqinfo *m,
110 struct v2_disk_dqinfo *d)
111 {
112 m->dqi_bgrace = ext2fs_le32_to_cpu(d->dqi_bgrace);
113 m->dqi_igrace = ext2fs_le32_to_cpu(d->dqi_igrace);
114 m->u.v2_mdqi.dqi_flags = ext2fs_le32_to_cpu(d->dqi_flags) & V2_DQF_MASK;
115 m->u.v2_mdqi.dqi_qtree.dqi_blocks = ext2fs_le32_to_cpu(d->dqi_blocks);
116 m->u.v2_mdqi.dqi_qtree.dqi_free_blk =
117 ext2fs_le32_to_cpu(d->dqi_free_blk);
118 m->u.v2_mdqi.dqi_qtree.dqi_free_entry =
119 ext2fs_le32_to_cpu(d->dqi_free_entry);
120 }
121
122 /*
123 * Copy dqinfo from memory to disk
124 */
v2_mem2diskdqinfo(struct v2_disk_dqinfo * d,struct util_dqinfo * m)125 static inline void v2_mem2diskdqinfo(struct v2_disk_dqinfo *d,
126 struct util_dqinfo *m)
127 {
128 d->dqi_bgrace = ext2fs_cpu_to_le32(m->dqi_bgrace);
129 d->dqi_igrace = ext2fs_cpu_to_le32(m->dqi_igrace);
130 d->dqi_flags = ext2fs_cpu_to_le32(m->u.v2_mdqi.dqi_flags & V2_DQF_MASK);
131 d->dqi_blocks = ext2fs_cpu_to_le32(m->u.v2_mdqi.dqi_qtree.dqi_blocks);
132 d->dqi_free_blk =
133 ext2fs_cpu_to_le32(m->u.v2_mdqi.dqi_qtree.dqi_free_blk);
134 d->dqi_free_entry =
135 ext2fs_cpu_to_le32(m->u.v2_mdqi.dqi_qtree.dqi_free_entry);
136 }
137
v2_read_header(struct quota_handle * h,struct v2_disk_dqheader * dqh)138 static int v2_read_header(struct quota_handle *h, struct v2_disk_dqheader *dqh)
139 {
140 if (h->e2fs_read(&h->qh_qf, 0, dqh, sizeof(struct v2_disk_dqheader)) !=
141 sizeof(struct v2_disk_dqheader))
142 return 0;
143
144 return 1;
145 }
146
147 /*
148 * Check whether given quota file is in our format
149 */
v2_check_file(struct quota_handle * h,int type,int fmt)150 static int v2_check_file(struct quota_handle *h, int type, int fmt)
151 {
152 struct v2_disk_dqheader dqh;
153 int file_magics[] = INITQMAGICS;
154 int be_magic;
155
156 if (fmt != QFMT_VFS_V1)
157 return 0;
158
159 if (!v2_read_header(h, &dqh))
160 return 0;
161
162 be_magic = ext2fs_be32_to_cpu((__force __be32)dqh.dqh_magic);
163 if (be_magic == file_magics[type]) {
164 log_err("Your quota file is stored in wrong endianity");
165 return 0;
166 }
167 if (V2_VERSION != ext2fs_le32_to_cpu(dqh.dqh_version))
168 return 0;
169 return 1;
170 }
171
172 /*
173 * Open quotafile
174 */
v2_init_io(struct quota_handle * h)175 static int v2_init_io(struct quota_handle *h)
176 {
177 struct v2_disk_dqinfo ddqinfo;
178 struct v2_mem_dqinfo *info;
179 __u64 filesize;
180
181 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_entry_size =
182 sizeof(struct v2r1_disk_dqblk);
183 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_ops = &v2r1_fmt_ops;
184
185 /* Read information about quotafile */
186 if (h->e2fs_read(&h->qh_qf, V2_DQINFOOFF, &ddqinfo,
187 sizeof(ddqinfo)) != sizeof(ddqinfo))
188 return -1;
189 v2_disk2memdqinfo(&h->qh_info, &ddqinfo);
190
191 /* Check to make sure quota file info is sane */
192 info = &h->qh_info.u.v2_mdqi;
193 if (ext2fs_file_get_lsize(h->qh_qf.e2_file, &filesize))
194 return -1;
195 if ((filesize > (1U << 31)) ||
196 (info->dqi_qtree.dqi_blocks >
197 (filesize + QT_BLKSIZE - 1) >> QT_BLKSIZE_BITS)) {
198 log_err("Quota inode %u corrupted: file size %llu; "
199 "dqi_blocks %u", h->qh_qf.ino,
200 (unsigned long long) filesize,
201 info->dqi_qtree.dqi_blocks);
202 return -1;
203 }
204 if (info->dqi_qtree.dqi_free_blk >= info->dqi_qtree.dqi_blocks) {
205 log_err("Quota inode %u corrupted: free_blk %u; dqi_blocks %u",
206 h->qh_qf.ino, info->dqi_qtree.dqi_free_blk,
207 info->dqi_qtree.dqi_blocks);
208 return -1;
209 }
210 if (info->dqi_qtree.dqi_free_entry >= info->dqi_qtree.dqi_blocks) {
211 log_err("Quota inode %u corrupted: free_entry %u; "
212 "dqi_blocks %u", h->qh_qf.ino,
213 info->dqi_qtree.dqi_free_entry,
214 info->dqi_qtree.dqi_blocks);
215 return -1;
216 }
217 return 0;
218 }
219
220 /*
221 * Initialize new quotafile
222 */
v2_new_io(struct quota_handle * h)223 static int v2_new_io(struct quota_handle *h)
224 {
225 int file_magics[] = INITQMAGICS;
226 struct v2_disk_dqheader ddqheader;
227 struct v2_disk_dqinfo ddqinfo;
228
229 if (h->qh_fmt != QFMT_VFS_V1)
230 return -1;
231
232 /* Write basic quota header */
233 ddqheader.dqh_magic = ext2fs_cpu_to_le32(file_magics[h->qh_type]);
234 ddqheader.dqh_version = ext2fs_cpu_to_le32(V2_VERSION);
235 if (h->e2fs_write(&h->qh_qf, 0, &ddqheader, sizeof(ddqheader)) !=
236 sizeof(ddqheader))
237 return -1;
238
239 /* Write information about quotafile */
240 h->qh_info.dqi_bgrace = MAX_DQ_TIME;
241 h->qh_info.dqi_igrace = MAX_IQ_TIME;
242 h->qh_info.u.v2_mdqi.dqi_flags = 0;
243 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_blocks = QT_TREEOFF + 1;
244 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_free_blk = 0;
245 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_free_entry = 0;
246 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_entry_size =
247 sizeof(struct v2r1_disk_dqblk);
248 h->qh_info.u.v2_mdqi.dqi_qtree.dqi_ops = &v2r1_fmt_ops;
249 v2_mem2diskdqinfo(&ddqinfo, &h->qh_info);
250 if (h->e2fs_write(&h->qh_qf, V2_DQINFOOFF, &ddqinfo,
251 sizeof(ddqinfo)) !=
252 sizeof(ddqinfo))
253 return -1;
254
255 return 0;
256 }
257
258 /*
259 * Write information (grace times to file)
260 */
v2_write_info(struct quota_handle * h)261 static int v2_write_info(struct quota_handle *h)
262 {
263 struct v2_disk_dqinfo ddqinfo;
264
265 v2_mem2diskdqinfo(&ddqinfo, &h->qh_info);
266 if (h->e2fs_write(&h->qh_qf, V2_DQINFOOFF, &ddqinfo, sizeof(ddqinfo)) !=
267 sizeof(ddqinfo))
268 return -1;
269
270 return 0;
271 }
272
273 /*
274 * Read dquot from disk
275 */
v2_read_dquot(struct quota_handle * h,qid_t id)276 static struct dquot *v2_read_dquot(struct quota_handle *h, qid_t id)
277 {
278 return qtree_read_dquot(h, id);
279 }
280
281 /*
282 * Commit changes of dquot to disk - it might also mean deleting it when quota
283 * became fake one and user has no blocks.
284 * User can process use 'errno' to detect errstr.
285 */
v2_commit_dquot(struct dquot * dquot)286 static int v2_commit_dquot(struct dquot *dquot)
287 {
288 struct util_dqblk *b = &dquot->dq_dqb;
289
290 if (!b->dqb_curspace && !b->dqb_curinodes && !b->dqb_bsoftlimit &&
291 !b->dqb_isoftlimit && !b->dqb_bhardlimit && !b->dqb_ihardlimit)
292 qtree_delete_dquot(dquot);
293 else
294 qtree_write_dquot(dquot);
295 return 0;
296 }
297
v2_scan_dquots(struct quota_handle * h,int (* process_dquot)(struct dquot *,void *),void * data)298 static int v2_scan_dquots(struct quota_handle *h,
299 int (*process_dquot) (struct dquot *, void *),
300 void *data)
301 {
302 return qtree_scan_dquots(h, process_dquot, data);
303 }
304
305 /* Report information about quotafile.
306 * TODO: Not used right now, but we should be able to use this when we add
307 * support to debugfs to read quota files.
308 */
v2_report(struct quota_handle * h EXT2FS_ATTR ((unused)),int verbose EXT2FS_ATTR ((unused)))309 static int v2_report(struct quota_handle *h EXT2FS_ATTR((unused)),
310 int verbose EXT2FS_ATTR((unused)))
311 {
312 log_err("Not Implemented.");
313 return -1;
314 }
315