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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> | |
9 | #include <linux/quotaio_v2.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/slab.h> | |
74abb989 | 14 | #include <linux/quotaops.h> |
1da177e4 LT |
15 | |
16 | #include <asm/byteorder.h> | |
17 | ||
18 | MODULE_AUTHOR("Jan Kara"); | |
19 | MODULE_DESCRIPTION("Quota format v2 support"); | |
20 | MODULE_LICENSE("GPL"); | |
21 | ||
22 | #define __QUOTA_V2_PARANOIA | |
23 | ||
24 | typedef char *dqbuf_t; | |
25 | ||
26 | #define GETIDINDEX(id, depth) (((id) >> ((V2_DQTREEDEPTH-(depth)-1)*8)) & 0xff) | |
27 | #define GETENTRIES(buf) ((struct v2_disk_dqblk *)(((char *)buf)+sizeof(struct v2_disk_dqdbheader))) | |
28 | ||
12095460 JK |
29 | #define QUOTABLOCK_BITS 10 |
30 | #define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS) | |
31 | ||
32 | static inline qsize_t v2_stoqb(qsize_t space) | |
33 | { | |
34 | return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS; | |
35 | } | |
36 | ||
37 | static inline qsize_t v2_qbtos(qsize_t blocks) | |
38 | { | |
39 | return blocks << QUOTABLOCK_BITS; | |
40 | } | |
41 | ||
1da177e4 LT |
42 | /* Check whether given file is really vfsv0 quotafile */ |
43 | static int v2_check_quota_file(struct super_block *sb, int type) | |
44 | { | |
45 | struct v2_disk_dqheader dqhead; | |
46 | ssize_t size; | |
47 | static const uint quota_magics[] = V2_INITQMAGICS; | |
48 | static const uint quota_versions[] = V2_INITQVERSIONS; | |
49 | ||
50 | size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0); | |
51 | if (size != sizeof(struct v2_disk_dqheader)) { | |
8c17e1eb | 52 | printk("quota_v2: failed read expected=%zd got=%zd\n", |
31358063 | 53 | sizeof(struct v2_disk_dqheader), size); |
1da177e4 LT |
54 | return 0; |
55 | } | |
56 | if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] || | |
57 | le32_to_cpu(dqhead.dqh_version) != quota_versions[type]) | |
58 | return 0; | |
59 | return 1; | |
60 | } | |
61 | ||
62 | /* Read information header from quota file */ | |
63 | static int v2_read_file_info(struct super_block *sb, int type) | |
64 | { | |
65 | struct v2_disk_dqinfo dinfo; | |
66 | struct mem_dqinfo *info = sb_dqopt(sb)->info+type; | |
67 | ssize_t size; | |
68 | ||
69 | size = sb->s_op->quota_read(sb, type, (char *)&dinfo, | |
70 | sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); | |
71 | if (size != sizeof(struct v2_disk_dqinfo)) { | |
72 | printk(KERN_WARNING "Can't read info structure on device %s.\n", | |
73 | sb->s_id); | |
74 | return -1; | |
75 | } | |
338bf9af AP |
76 | /* limits are stored as unsigned 32-bit data */ |
77 | info->dqi_maxblimit = 0xffffffff; | |
78 | info->dqi_maxilimit = 0xffffffff; | |
1da177e4 LT |
79 | info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); |
80 | info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); | |
81 | info->dqi_flags = le32_to_cpu(dinfo.dqi_flags); | |
82 | info->u.v2_i.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); | |
83 | info->u.v2_i.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); | |
84 | info->u.v2_i.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); | |
85 | return 0; | |
86 | } | |
87 | ||
88 | /* Write information header to quota file */ | |
89 | static int v2_write_file_info(struct super_block *sb, int type) | |
90 | { | |
91 | struct v2_disk_dqinfo dinfo; | |
92 | struct mem_dqinfo *info = sb_dqopt(sb)->info+type; | |
93 | ssize_t size; | |
94 | ||
95 | spin_lock(&dq_data_lock); | |
96 | info->dqi_flags &= ~DQF_INFO_DIRTY; | |
97 | dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); | |
98 | dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); | |
99 | dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK); | |
100 | spin_unlock(&dq_data_lock); | |
101 | dinfo.dqi_blocks = cpu_to_le32(info->u.v2_i.dqi_blocks); | |
102 | dinfo.dqi_free_blk = cpu_to_le32(info->u.v2_i.dqi_free_blk); | |
103 | dinfo.dqi_free_entry = cpu_to_le32(info->u.v2_i.dqi_free_entry); | |
104 | size = sb->s_op->quota_write(sb, type, (char *)&dinfo, | |
105 | sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); | |
106 | if (size != sizeof(struct v2_disk_dqinfo)) { | |
107 | printk(KERN_WARNING "Can't write info structure on device %s.\n", | |
108 | sb->s_id); | |
109 | return -1; | |
110 | } | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static void disk2memdqb(struct mem_dqblk *m, struct v2_disk_dqblk *d) | |
115 | { | |
116 | m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit); | |
117 | m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit); | |
118 | m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes); | |
119 | m->dqb_itime = le64_to_cpu(d->dqb_itime); | |
12095460 JK |
120 | m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit)); |
121 | m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit)); | |
1da177e4 LT |
122 | m->dqb_curspace = le64_to_cpu(d->dqb_curspace); |
123 | m->dqb_btime = le64_to_cpu(d->dqb_btime); | |
124 | } | |
125 | ||
126 | static void mem2diskdqb(struct v2_disk_dqblk *d, struct mem_dqblk *m, qid_t id) | |
127 | { | |
128 | d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit); | |
129 | d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit); | |
130 | d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes); | |
131 | d->dqb_itime = cpu_to_le64(m->dqb_itime); | |
12095460 JK |
132 | d->dqb_bhardlimit = cpu_to_le32(v2_qbtos(m->dqb_bhardlimit)); |
133 | d->dqb_bsoftlimit = cpu_to_le32(v2_qbtos(m->dqb_bsoftlimit)); | |
1da177e4 LT |
134 | d->dqb_curspace = cpu_to_le64(m->dqb_curspace); |
135 | d->dqb_btime = cpu_to_le64(m->dqb_btime); | |
136 | d->dqb_id = cpu_to_le32(id); | |
137 | } | |
138 | ||
139 | static dqbuf_t getdqbuf(void) | |
140 | { | |
141 | dqbuf_t buf = kmalloc(V2_DQBLKSIZE, GFP_NOFS); | |
142 | if (!buf) | |
143 | printk(KERN_WARNING "VFS: Not enough memory for quota buffers.\n"); | |
144 | return buf; | |
145 | } | |
146 | ||
147 | static inline void freedqbuf(dqbuf_t buf) | |
148 | { | |
149 | kfree(buf); | |
150 | } | |
151 | ||
152 | static inline ssize_t read_blk(struct super_block *sb, int type, uint blk, dqbuf_t buf) | |
153 | { | |
154 | memset(buf, 0, V2_DQBLKSIZE); | |
155 | return sb->s_op->quota_read(sb, type, (char *)buf, | |
156 | V2_DQBLKSIZE, blk << V2_DQBLKSIZE_BITS); | |
157 | } | |
158 | ||
159 | static inline ssize_t write_blk(struct super_block *sb, int type, uint blk, dqbuf_t buf) | |
160 | { | |
161 | return sb->s_op->quota_write(sb, type, (char *)buf, | |
162 | V2_DQBLKSIZE, blk << V2_DQBLKSIZE_BITS); | |
163 | } | |
164 | ||
165 | /* Remove empty block from list and return it */ | |
166 | static int get_free_dqblk(struct super_block *sb, int type) | |
167 | { | |
168 | dqbuf_t buf = getdqbuf(); | |
169 | struct mem_dqinfo *info = sb_dqinfo(sb, type); | |
170 | struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf; | |
171 | int ret, blk; | |
172 | ||
173 | if (!buf) | |
174 | return -ENOMEM; | |
175 | if (info->u.v2_i.dqi_free_blk) { | |
176 | blk = info->u.v2_i.dqi_free_blk; | |
177 | if ((ret = read_blk(sb, type, blk, buf)) < 0) | |
178 | goto out_buf; | |
179 | info->u.v2_i.dqi_free_blk = le32_to_cpu(dh->dqdh_next_free); | |
180 | } | |
181 | else { | |
182 | memset(buf, 0, V2_DQBLKSIZE); | |
183 | /* Assure block allocation... */ | |
184 | if ((ret = write_blk(sb, type, info->u.v2_i.dqi_blocks, buf)) < 0) | |
185 | goto out_buf; | |
186 | blk = info->u.v2_i.dqi_blocks++; | |
187 | } | |
188 | mark_info_dirty(sb, type); | |
189 | ret = blk; | |
190 | out_buf: | |
191 | freedqbuf(buf); | |
192 | return ret; | |
193 | } | |
194 | ||
195 | /* Insert empty block to the list */ | |
196 | static int put_free_dqblk(struct super_block *sb, int type, dqbuf_t buf, uint blk) | |
197 | { | |
198 | struct mem_dqinfo *info = sb_dqinfo(sb, type); | |
199 | struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf; | |
200 | int err; | |
201 | ||
202 | dh->dqdh_next_free = cpu_to_le32(info->u.v2_i.dqi_free_blk); | |
203 | dh->dqdh_prev_free = cpu_to_le32(0); | |
204 | dh->dqdh_entries = cpu_to_le16(0); | |
205 | info->u.v2_i.dqi_free_blk = blk; | |
206 | mark_info_dirty(sb, type); | |
207 | /* Some strange block. We had better leave it... */ | |
208 | if ((err = write_blk(sb, type, blk, buf)) < 0) | |
209 | return err; | |
210 | return 0; | |
211 | } | |
212 | ||
213 | /* Remove given block from the list of blocks with free entries */ | |
214 | static int remove_free_dqentry(struct super_block *sb, int type, dqbuf_t buf, uint blk) | |
215 | { | |
216 | dqbuf_t tmpbuf = getdqbuf(); | |
217 | struct mem_dqinfo *info = sb_dqinfo(sb, type); | |
218 | struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf; | |
219 | uint nextblk = le32_to_cpu(dh->dqdh_next_free), prevblk = le32_to_cpu(dh->dqdh_prev_free); | |
220 | int err; | |
221 | ||
222 | if (!tmpbuf) | |
223 | return -ENOMEM; | |
224 | if (nextblk) { | |
225 | if ((err = read_blk(sb, type, nextblk, tmpbuf)) < 0) | |
226 | goto out_buf; | |
227 | ((struct v2_disk_dqdbheader *)tmpbuf)->dqdh_prev_free = dh->dqdh_prev_free; | |
228 | if ((err = write_blk(sb, type, nextblk, tmpbuf)) < 0) | |
229 | goto out_buf; | |
230 | } | |
231 | if (prevblk) { | |
232 | if ((err = read_blk(sb, type, prevblk, tmpbuf)) < 0) | |
233 | goto out_buf; | |
234 | ((struct v2_disk_dqdbheader *)tmpbuf)->dqdh_next_free = dh->dqdh_next_free; | |
235 | if ((err = write_blk(sb, type, prevblk, tmpbuf)) < 0) | |
236 | goto out_buf; | |
237 | } | |
238 | else { | |
239 | info->u.v2_i.dqi_free_entry = nextblk; | |
240 | mark_info_dirty(sb, type); | |
241 | } | |
242 | freedqbuf(tmpbuf); | |
243 | dh->dqdh_next_free = dh->dqdh_prev_free = cpu_to_le32(0); | |
244 | /* No matter whether write succeeds block is out of list */ | |
245 | if (write_blk(sb, type, blk, buf) < 0) | |
246 | printk(KERN_ERR "VFS: Can't write block (%u) with free entries.\n", blk); | |
247 | return 0; | |
248 | out_buf: | |
249 | freedqbuf(tmpbuf); | |
250 | return err; | |
251 | } | |
252 | ||
253 | /* Insert given block to the beginning of list with free entries */ | |
254 | static int insert_free_dqentry(struct super_block *sb, int type, dqbuf_t buf, uint blk) | |
255 | { | |
256 | dqbuf_t tmpbuf = getdqbuf(); | |
257 | struct mem_dqinfo *info = sb_dqinfo(sb, type); | |
258 | struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf; | |
259 | int err; | |
260 | ||
261 | if (!tmpbuf) | |
262 | return -ENOMEM; | |
263 | dh->dqdh_next_free = cpu_to_le32(info->u.v2_i.dqi_free_entry); | |
264 | dh->dqdh_prev_free = cpu_to_le32(0); | |
265 | if ((err = write_blk(sb, type, blk, buf)) < 0) | |
266 | goto out_buf; | |
267 | if (info->u.v2_i.dqi_free_entry) { | |
268 | if ((err = read_blk(sb, type, info->u.v2_i.dqi_free_entry, tmpbuf)) < 0) | |
269 | goto out_buf; | |
270 | ((struct v2_disk_dqdbheader *)tmpbuf)->dqdh_prev_free = cpu_to_le32(blk); | |
271 | if ((err = write_blk(sb, type, info->u.v2_i.dqi_free_entry, tmpbuf)) < 0) | |
272 | goto out_buf; | |
273 | } | |
274 | freedqbuf(tmpbuf); | |
275 | info->u.v2_i.dqi_free_entry = blk; | |
276 | mark_info_dirty(sb, type); | |
277 | return 0; | |
278 | out_buf: | |
279 | freedqbuf(tmpbuf); | |
280 | return err; | |
281 | } | |
282 | ||
283 | /* Find space for dquot */ | |
284 | static uint find_free_dqentry(struct dquot *dquot, int *err) | |
285 | { | |
286 | struct super_block *sb = dquot->dq_sb; | |
287 | struct mem_dqinfo *info = sb_dqopt(sb)->info+dquot->dq_type; | |
288 | uint blk, i; | |
289 | struct v2_disk_dqdbheader *dh; | |
290 | struct v2_disk_dqblk *ddquot; | |
291 | struct v2_disk_dqblk fakedquot; | |
292 | dqbuf_t buf; | |
293 | ||
294 | *err = 0; | |
295 | if (!(buf = getdqbuf())) { | |
296 | *err = -ENOMEM; | |
297 | return 0; | |
298 | } | |
299 | dh = (struct v2_disk_dqdbheader *)buf; | |
300 | ddquot = GETENTRIES(buf); | |
301 | if (info->u.v2_i.dqi_free_entry) { | |
302 | blk = info->u.v2_i.dqi_free_entry; | |
303 | if ((*err = read_blk(sb, dquot->dq_type, blk, buf)) < 0) | |
304 | goto out_buf; | |
305 | } | |
306 | else { | |
307 | blk = get_free_dqblk(sb, dquot->dq_type); | |
308 | if ((int)blk < 0) { | |
309 | *err = blk; | |
310 | freedqbuf(buf); | |
311 | return 0; | |
312 | } | |
313 | memset(buf, 0, V2_DQBLKSIZE); | |
314 | /* This is enough as block is already zeroed and entry list is empty... */ | |
315 | info->u.v2_i.dqi_free_entry = blk; | |
316 | mark_info_dirty(sb, dquot->dq_type); | |
317 | } | |
318 | if (le16_to_cpu(dh->dqdh_entries)+1 >= V2_DQSTRINBLK) /* Block will be full? */ | |
319 | if ((*err = remove_free_dqentry(sb, dquot->dq_type, buf, blk)) < 0) { | |
320 | printk(KERN_ERR "VFS: find_free_dqentry(): Can't remove block (%u) from entry free list.\n", blk); | |
321 | goto out_buf; | |
322 | } | |
e3592b12 | 323 | le16_add_cpu(&dh->dqdh_entries, 1); |
1da177e4 LT |
324 | memset(&fakedquot, 0, sizeof(struct v2_disk_dqblk)); |
325 | /* Find free structure in block */ | |
326 | for (i = 0; i < V2_DQSTRINBLK && memcmp(&fakedquot, ddquot+i, sizeof(struct v2_disk_dqblk)); i++); | |
327 | #ifdef __QUOTA_V2_PARANOIA | |
328 | if (i == V2_DQSTRINBLK) { | |
329 | printk(KERN_ERR "VFS: find_free_dqentry(): Data block full but it shouldn't.\n"); | |
330 | *err = -EIO; | |
331 | goto out_buf; | |
332 | } | |
333 | #endif | |
334 | if ((*err = write_blk(sb, dquot->dq_type, blk, buf)) < 0) { | |
335 | printk(KERN_ERR "VFS: find_free_dqentry(): Can't write quota data block %u.\n", blk); | |
336 | goto out_buf; | |
337 | } | |
338 | dquot->dq_off = (blk<<V2_DQBLKSIZE_BITS)+sizeof(struct v2_disk_dqdbheader)+i*sizeof(struct v2_disk_dqblk); | |
339 | freedqbuf(buf); | |
340 | return blk; | |
341 | out_buf: | |
342 | freedqbuf(buf); | |
343 | return 0; | |
344 | } | |
345 | ||
346 | /* Insert reference to structure into the trie */ | |
347 | static int do_insert_tree(struct dquot *dquot, uint *treeblk, int depth) | |
348 | { | |
349 | struct super_block *sb = dquot->dq_sb; | |
350 | dqbuf_t buf; | |
351 | int ret = 0, newson = 0, newact = 0; | |
352 | __le32 *ref; | |
353 | uint newblk; | |
354 | ||
355 | if (!(buf = getdqbuf())) | |
356 | return -ENOMEM; | |
357 | if (!*treeblk) { | |
358 | ret = get_free_dqblk(sb, dquot->dq_type); | |
359 | if (ret < 0) | |
360 | goto out_buf; | |
361 | *treeblk = ret; | |
362 | memset(buf, 0, V2_DQBLKSIZE); | |
363 | newact = 1; | |
364 | } | |
365 | else { | |
366 | if ((ret = read_blk(sb, dquot->dq_type, *treeblk, buf)) < 0) { | |
367 | printk(KERN_ERR "VFS: Can't read tree quota block %u.\n", *treeblk); | |
368 | goto out_buf; | |
369 | } | |
370 | } | |
371 | ref = (__le32 *)buf; | |
372 | newblk = le32_to_cpu(ref[GETIDINDEX(dquot->dq_id, depth)]); | |
373 | if (!newblk) | |
374 | newson = 1; | |
375 | if (depth == V2_DQTREEDEPTH-1) { | |
376 | #ifdef __QUOTA_V2_PARANOIA | |
377 | if (newblk) { | |
378 | printk(KERN_ERR "VFS: Inserting already present quota entry (block %u).\n", le32_to_cpu(ref[GETIDINDEX(dquot->dq_id, depth)])); | |
379 | ret = -EIO; | |
380 | goto out_buf; | |
381 | } | |
382 | #endif | |
383 | newblk = find_free_dqentry(dquot, &ret); | |
384 | } | |
385 | else | |
386 | ret = do_insert_tree(dquot, &newblk, depth+1); | |
387 | if (newson && ret >= 0) { | |
388 | ref[GETIDINDEX(dquot->dq_id, depth)] = cpu_to_le32(newblk); | |
389 | ret = write_blk(sb, dquot->dq_type, *treeblk, buf); | |
390 | } | |
391 | else if (newact && ret < 0) | |
392 | put_free_dqblk(sb, dquot->dq_type, buf, *treeblk); | |
393 | out_buf: | |
394 | freedqbuf(buf); | |
395 | return ret; | |
396 | } | |
397 | ||
398 | /* Wrapper for inserting quota structure into tree */ | |
399 | static inline int dq_insert_tree(struct dquot *dquot) | |
400 | { | |
401 | int tmp = V2_DQTREEOFF; | |
402 | return do_insert_tree(dquot, &tmp, 0); | |
403 | } | |
404 | ||
405 | /* | |
406 | * We don't have to be afraid of deadlocks as we never have quotas on quota files... | |
407 | */ | |
408 | static int v2_write_dquot(struct dquot *dquot) | |
409 | { | |
410 | int type = dquot->dq_type; | |
411 | ssize_t ret; | |
412 | struct v2_disk_dqblk ddquot, empty; | |
413 | ||
d3be915f | 414 | /* dq_off is guarded by dqio_mutex */ |
1da177e4 LT |
415 | if (!dquot->dq_off) |
416 | if ((ret = dq_insert_tree(dquot)) < 0) { | |
417 | printk(KERN_ERR "VFS: Error %zd occurred while creating quota.\n", ret); | |
418 | return ret; | |
419 | } | |
420 | spin_lock(&dq_data_lock); | |
421 | mem2diskdqb(&ddquot, &dquot->dq_dqb, dquot->dq_id); | |
422 | /* Argh... We may need to write structure full of zeroes but that would be | |
423 | * treated as an empty place by the rest of the code. Format change would | |
424 | * be definitely cleaner but the problems probably are not worth it */ | |
425 | memset(&empty, 0, sizeof(struct v2_disk_dqblk)); | |
426 | if (!memcmp(&empty, &ddquot, sizeof(struct v2_disk_dqblk))) | |
427 | ddquot.dqb_itime = cpu_to_le64(1); | |
428 | spin_unlock(&dq_data_lock); | |
429 | ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type, | |
430 | (char *)&ddquot, sizeof(struct v2_disk_dqblk), dquot->dq_off); | |
431 | if (ret != sizeof(struct v2_disk_dqblk)) { | |
432 | printk(KERN_WARNING "VFS: dquota write failed on dev %s\n", dquot->dq_sb->s_id); | |
433 | if (ret >= 0) | |
434 | ret = -ENOSPC; | |
435 | } | |
436 | else | |
437 | ret = 0; | |
438 | dqstats.writes++; | |
439 | ||
440 | return ret; | |
441 | } | |
442 | ||
443 | /* Free dquot entry in data block */ | |
444 | static int free_dqentry(struct dquot *dquot, uint blk) | |
445 | { | |
446 | struct super_block *sb = dquot->dq_sb; | |
447 | int type = dquot->dq_type; | |
448 | struct v2_disk_dqdbheader *dh; | |
449 | dqbuf_t buf = getdqbuf(); | |
450 | int ret = 0; | |
451 | ||
452 | if (!buf) | |
453 | return -ENOMEM; | |
454 | if (dquot->dq_off >> V2_DQBLKSIZE_BITS != blk) { | |
455 | printk(KERN_ERR "VFS: Quota structure has offset to other " | |
456 | "block (%u) than it should (%u).\n", blk, | |
457 | (uint)(dquot->dq_off >> V2_DQBLKSIZE_BITS)); | |
458 | goto out_buf; | |
459 | } | |
460 | if ((ret = read_blk(sb, type, blk, buf)) < 0) { | |
461 | printk(KERN_ERR "VFS: Can't read quota data block %u\n", blk); | |
462 | goto out_buf; | |
463 | } | |
464 | dh = (struct v2_disk_dqdbheader *)buf; | |
e3592b12 | 465 | le16_add_cpu(&dh->dqdh_entries, -1); |
1da177e4 LT |
466 | if (!le16_to_cpu(dh->dqdh_entries)) { /* Block got free? */ |
467 | if ((ret = remove_free_dqentry(sb, type, buf, blk)) < 0 || | |
468 | (ret = put_free_dqblk(sb, type, buf, blk)) < 0) { | |
469 | printk(KERN_ERR "VFS: Can't move quota data block (%u) " | |
470 | "to free list.\n", blk); | |
471 | goto out_buf; | |
472 | } | |
473 | } | |
474 | else { | |
475 | memset(buf+(dquot->dq_off & ((1 << V2_DQBLKSIZE_BITS)-1)), 0, | |
476 | sizeof(struct v2_disk_dqblk)); | |
477 | if (le16_to_cpu(dh->dqdh_entries) == V2_DQSTRINBLK-1) { | |
478 | /* Insert will write block itself */ | |
479 | if ((ret = insert_free_dqentry(sb, type, buf, blk)) < 0) { | |
480 | printk(KERN_ERR "VFS: Can't insert quota data block (%u) to free entry list.\n", blk); | |
481 | goto out_buf; | |
482 | } | |
483 | } | |
484 | else | |
485 | if ((ret = write_blk(sb, type, blk, buf)) < 0) { | |
486 | printk(KERN_ERR "VFS: Can't write quota data " | |
487 | "block %u\n", blk); | |
488 | goto out_buf; | |
489 | } | |
490 | } | |
491 | dquot->dq_off = 0; /* Quota is now unattached */ | |
492 | out_buf: | |
493 | freedqbuf(buf); | |
494 | return ret; | |
495 | } | |
496 | ||
497 | /* Remove reference to dquot from tree */ | |
498 | static int remove_tree(struct dquot *dquot, uint *blk, int depth) | |
499 | { | |
500 | struct super_block *sb = dquot->dq_sb; | |
501 | int type = dquot->dq_type; | |
502 | dqbuf_t buf = getdqbuf(); | |
503 | int ret = 0; | |
504 | uint newblk; | |
505 | __le32 *ref = (__le32 *)buf; | |
506 | ||
507 | if (!buf) | |
508 | return -ENOMEM; | |
509 | if ((ret = read_blk(sb, type, *blk, buf)) < 0) { | |
510 | printk(KERN_ERR "VFS: Can't read quota data block %u\n", *blk); | |
511 | goto out_buf; | |
512 | } | |
513 | newblk = le32_to_cpu(ref[GETIDINDEX(dquot->dq_id, depth)]); | |
514 | if (depth == V2_DQTREEDEPTH-1) { | |
515 | ret = free_dqentry(dquot, newblk); | |
516 | newblk = 0; | |
517 | } | |
518 | else | |
519 | ret = remove_tree(dquot, &newblk, depth+1); | |
520 | if (ret >= 0 && !newblk) { | |
521 | int i; | |
522 | ref[GETIDINDEX(dquot->dq_id, depth)] = cpu_to_le32(0); | |
523 | for (i = 0; i < V2_DQBLKSIZE && !buf[i]; i++); /* Block got empty? */ | |
e821d94d NY |
524 | /* Don't put the root block into the free block list */ |
525 | if (i == V2_DQBLKSIZE && *blk != V2_DQTREEOFF) { | |
1da177e4 LT |
526 | put_free_dqblk(sb, type, buf, *blk); |
527 | *blk = 0; | |
528 | } | |
529 | else | |
530 | if ((ret = write_blk(sb, type, *blk, buf)) < 0) | |
531 | printk(KERN_ERR "VFS: Can't write quota tree " | |
532 | "block %u.\n", *blk); | |
533 | } | |
534 | out_buf: | |
535 | freedqbuf(buf); | |
536 | return ret; | |
537 | } | |
538 | ||
539 | /* Delete dquot from tree */ | |
540 | static int v2_delete_dquot(struct dquot *dquot) | |
541 | { | |
542 | uint tmp = V2_DQTREEOFF; | |
543 | ||
544 | if (!dquot->dq_off) /* Even not allocated? */ | |
545 | return 0; | |
546 | return remove_tree(dquot, &tmp, 0); | |
547 | } | |
548 | ||
549 | /* Find entry in block */ | |
550 | static loff_t find_block_dqentry(struct dquot *dquot, uint blk) | |
551 | { | |
552 | dqbuf_t buf = getdqbuf(); | |
553 | loff_t ret = 0; | |
554 | int i; | |
555 | struct v2_disk_dqblk *ddquot = GETENTRIES(buf); | |
556 | ||
557 | if (!buf) | |
558 | return -ENOMEM; | |
559 | if ((ret = read_blk(dquot->dq_sb, dquot->dq_type, blk, buf)) < 0) { | |
560 | printk(KERN_ERR "VFS: Can't read quota tree block %u.\n", blk); | |
561 | goto out_buf; | |
562 | } | |
563 | if (dquot->dq_id) | |
564 | for (i = 0; i < V2_DQSTRINBLK && | |
565 | le32_to_cpu(ddquot[i].dqb_id) != dquot->dq_id; i++); | |
566 | else { /* ID 0 as a bit more complicated searching... */ | |
567 | struct v2_disk_dqblk fakedquot; | |
568 | ||
569 | memset(&fakedquot, 0, sizeof(struct v2_disk_dqblk)); | |
570 | for (i = 0; i < V2_DQSTRINBLK; i++) | |
571 | if (!le32_to_cpu(ddquot[i].dqb_id) && | |
572 | memcmp(&fakedquot, ddquot+i, sizeof(struct v2_disk_dqblk))) | |
573 | break; | |
574 | } | |
575 | if (i == V2_DQSTRINBLK) { | |
576 | printk(KERN_ERR "VFS: Quota for id %u referenced " | |
577 | "but not present.\n", dquot->dq_id); | |
578 | ret = -EIO; | |
579 | goto out_buf; | |
580 | } | |
581 | else | |
582 | ret = (blk << V2_DQBLKSIZE_BITS) + sizeof(struct | |
583 | v2_disk_dqdbheader) + i * sizeof(struct v2_disk_dqblk); | |
584 | out_buf: | |
585 | freedqbuf(buf); | |
586 | return ret; | |
587 | } | |
588 | ||
589 | /* Find entry for given id in the tree */ | |
590 | static loff_t find_tree_dqentry(struct dquot *dquot, uint blk, int depth) | |
591 | { | |
592 | dqbuf_t buf = getdqbuf(); | |
593 | loff_t ret = 0; | |
594 | __le32 *ref = (__le32 *)buf; | |
595 | ||
596 | if (!buf) | |
597 | return -ENOMEM; | |
598 | if ((ret = read_blk(dquot->dq_sb, dquot->dq_type, blk, buf)) < 0) { | |
599 | printk(KERN_ERR "VFS: Can't read quota tree block %u.\n", blk); | |
600 | goto out_buf; | |
601 | } | |
602 | ret = 0; | |
603 | blk = le32_to_cpu(ref[GETIDINDEX(dquot->dq_id, depth)]); | |
604 | if (!blk) /* No reference? */ | |
605 | goto out_buf; | |
606 | if (depth < V2_DQTREEDEPTH-1) | |
607 | ret = find_tree_dqentry(dquot, blk, depth+1); | |
608 | else | |
609 | ret = find_block_dqentry(dquot, blk); | |
610 | out_buf: | |
611 | freedqbuf(buf); | |
612 | return ret; | |
613 | } | |
614 | ||
615 | /* Find entry for given id in the tree - wrapper function */ | |
616 | static inline loff_t find_dqentry(struct dquot *dquot) | |
617 | { | |
618 | return find_tree_dqentry(dquot, V2_DQTREEOFF, 0); | |
619 | } | |
620 | ||
621 | static int v2_read_dquot(struct dquot *dquot) | |
622 | { | |
623 | int type = dquot->dq_type; | |
624 | loff_t offset; | |
625 | struct v2_disk_dqblk ddquot, empty; | |
626 | int ret = 0; | |
627 | ||
628 | #ifdef __QUOTA_V2_PARANOIA | |
629 | /* Invalidated quota? */ | |
630 | if (!dquot->dq_sb || !sb_dqopt(dquot->dq_sb)->files[type]) { | |
631 | printk(KERN_ERR "VFS: Quota invalidated while reading!\n"); | |
632 | return -EIO; | |
633 | } | |
634 | #endif | |
635 | offset = find_dqentry(dquot); | |
636 | if (offset <= 0) { /* Entry not present? */ | |
637 | if (offset < 0) | |
638 | printk(KERN_ERR "VFS: Can't read quota " | |
639 | "structure for id %u.\n", dquot->dq_id); | |
640 | dquot->dq_off = 0; | |
641 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
642 | memset(&dquot->dq_dqb, 0, sizeof(struct mem_dqblk)); | |
643 | ret = offset; | |
644 | } | |
645 | else { | |
646 | dquot->dq_off = offset; | |
647 | if ((ret = dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, | |
648 | (char *)&ddquot, sizeof(struct v2_disk_dqblk), offset)) | |
649 | != sizeof(struct v2_disk_dqblk)) { | |
650 | if (ret >= 0) | |
651 | ret = -EIO; | |
652 | printk(KERN_ERR "VFS: Error while reading quota " | |
653 | "structure for id %u.\n", dquot->dq_id); | |
654 | memset(&ddquot, 0, sizeof(struct v2_disk_dqblk)); | |
655 | } | |
656 | else { | |
657 | ret = 0; | |
658 | /* We need to escape back all-zero structure */ | |
659 | memset(&empty, 0, sizeof(struct v2_disk_dqblk)); | |
660 | empty.dqb_itime = cpu_to_le64(1); | |
661 | if (!memcmp(&empty, &ddquot, sizeof(struct v2_disk_dqblk))) | |
662 | ddquot.dqb_itime = 0; | |
663 | } | |
664 | disk2memdqb(&dquot->dq_dqb, &ddquot); | |
665 | if (!dquot->dq_dqb.dqb_bhardlimit && | |
666 | !dquot->dq_dqb.dqb_bsoftlimit && | |
667 | !dquot->dq_dqb.dqb_ihardlimit && | |
668 | !dquot->dq_dqb.dqb_isoftlimit) | |
669 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
670 | } | |
671 | dqstats.reads++; | |
672 | ||
673 | return ret; | |
674 | } | |
675 | ||
676 | /* Check whether dquot should not be deleted. We know we are | |
677 | * the only one operating on dquot (thanks to dq_lock) */ | |
678 | static int v2_release_dquot(struct dquot *dquot) | |
679 | { | |
680 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) && !(dquot->dq_dqb.dqb_curinodes | dquot->dq_dqb.dqb_curspace)) | |
681 | return v2_delete_dquot(dquot); | |
682 | return 0; | |
683 | } | |
684 | ||
685 | static struct quota_format_ops v2_format_ops = { | |
686 | .check_quota_file = v2_check_quota_file, | |
687 | .read_file_info = v2_read_file_info, | |
688 | .write_file_info = v2_write_file_info, | |
689 | .free_file_info = NULL, | |
690 | .read_dqblk = v2_read_dquot, | |
691 | .commit_dqblk = v2_write_dquot, | |
692 | .release_dqblk = v2_release_dquot, | |
693 | }; | |
694 | ||
695 | static struct quota_format_type v2_quota_format = { | |
696 | .qf_fmt_id = QFMT_VFS_V0, | |
697 | .qf_ops = &v2_format_ops, | |
698 | .qf_owner = THIS_MODULE | |
699 | }; | |
700 | ||
701 | static int __init init_v2_quota_format(void) | |
702 | { | |
703 | return register_quota_format(&v2_quota_format); | |
704 | } | |
705 | ||
706 | static void __exit exit_v2_quota_format(void) | |
707 | { | |
708 | unregister_quota_format(&v2_quota_format); | |
709 | } | |
710 | ||
711 | module_init(init_v2_quota_format); | |
712 | module_exit(exit_v2_quota_format); |