Commit | Line | Data |
---|---|---|
1ccd14b9 JK |
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/kernel.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/quotaops.h> | |
14 | ||
15 | #include <asm/byteorder.h> | |
16 | ||
17 | #include "quota_tree.h" | |
18 | ||
19 | MODULE_AUTHOR("Jan Kara"); | |
20 | MODULE_DESCRIPTION("Quota trie support"); | |
21 | MODULE_LICENSE("GPL"); | |
22 | ||
23 | #define __QUOTA_QT_PARANOIA | |
24 | ||
4c376dca | 25 | static int get_index(struct qtree_mem_dqinfo *info, struct kqid qid, int depth) |
1ccd14b9 JK |
26 | { |
27 | unsigned int epb = info->dqi_usable_bs >> 2; | |
4c376dca | 28 | qid_t id = from_kqid(&init_user_ns, qid); |
1ccd14b9 JK |
29 | |
30 | depth = info->dqi_qtree_depth - depth - 1; | |
31 | while (depth--) | |
32 | id /= epb; | |
33 | return id % epb; | |
34 | } | |
35 | ||
36 | /* Number of entries in one blocks */ | |
7a2435d8 | 37 | static int qtree_dqstr_in_blk(struct qtree_mem_dqinfo *info) |
1ccd14b9 JK |
38 | { |
39 | return (info->dqi_usable_bs - sizeof(struct qt_disk_dqdbheader)) | |
40 | / info->dqi_entry_size; | |
41 | } | |
42 | ||
d26ac1a8 | 43 | static char *getdqbuf(size_t size) |
1ccd14b9 | 44 | { |
d26ac1a8 | 45 | char *buf = kmalloc(size, GFP_NOFS); |
1ccd14b9 | 46 | if (!buf) |
268157ba JK |
47 | printk(KERN_WARNING |
48 | "VFS: Not enough memory for quota buffers.\n"); | |
1ccd14b9 JK |
49 | return buf; |
50 | } | |
51 | ||
7a2435d8 | 52 | static ssize_t read_blk(struct qtree_mem_dqinfo *info, uint blk, char *buf) |
1ccd14b9 JK |
53 | { |
54 | struct super_block *sb = info->dqi_sb; | |
55 | ||
56 | memset(buf, 0, info->dqi_usable_bs); | |
d26ac1a8 | 57 | return sb->s_op->quota_read(sb, info->dqi_type, buf, |
1ccd14b9 JK |
58 | info->dqi_usable_bs, blk << info->dqi_blocksize_bits); |
59 | } | |
60 | ||
7a2435d8 | 61 | static ssize_t write_blk(struct qtree_mem_dqinfo *info, uint blk, char *buf) |
1ccd14b9 JK |
62 | { |
63 | struct super_block *sb = info->dqi_sb; | |
1907131b | 64 | ssize_t ret; |
1ccd14b9 | 65 | |
1907131b | 66 | ret = sb->s_op->quota_write(sb, info->dqi_type, buf, |
1ccd14b9 | 67 | info->dqi_usable_bs, blk << info->dqi_blocksize_bits); |
1907131b | 68 | if (ret != info->dqi_usable_bs) { |
fb5ffb0e | 69 | quota_error(sb, "dquota write failed"); |
1907131b JZ |
70 | if (ret >= 0) |
71 | ret = -EIO; | |
72 | } | |
73 | return ret; | |
1ccd14b9 JK |
74 | } |
75 | ||
76 | /* Remove empty block from list and return it */ | |
77 | static int get_free_dqblk(struct qtree_mem_dqinfo *info) | |
78 | { | |
d26ac1a8 | 79 | char *buf = getdqbuf(info->dqi_usable_bs); |
1ccd14b9 JK |
80 | struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf; |
81 | int ret, blk; | |
82 | ||
83 | if (!buf) | |
84 | return -ENOMEM; | |
85 | if (info->dqi_free_blk) { | |
86 | blk = info->dqi_free_blk; | |
87 | ret = read_blk(info, blk, buf); | |
88 | if (ret < 0) | |
89 | goto out_buf; | |
90 | info->dqi_free_blk = le32_to_cpu(dh->dqdh_next_free); | |
91 | } | |
92 | else { | |
93 | memset(buf, 0, info->dqi_usable_bs); | |
94 | /* Assure block allocation... */ | |
95 | ret = write_blk(info, info->dqi_blocks, buf); | |
96 | if (ret < 0) | |
97 | goto out_buf; | |
98 | blk = info->dqi_blocks++; | |
99 | } | |
100 | mark_info_dirty(info->dqi_sb, info->dqi_type); | |
101 | ret = blk; | |
102 | out_buf: | |
d26ac1a8 | 103 | kfree(buf); |
1ccd14b9 JK |
104 | return ret; |
105 | } | |
106 | ||
107 | /* Insert empty block to the list */ | |
d26ac1a8 | 108 | static int put_free_dqblk(struct qtree_mem_dqinfo *info, char *buf, uint blk) |
1ccd14b9 JK |
109 | { |
110 | struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf; | |
111 | int err; | |
112 | ||
113 | dh->dqdh_next_free = cpu_to_le32(info->dqi_free_blk); | |
114 | dh->dqdh_prev_free = cpu_to_le32(0); | |
115 | dh->dqdh_entries = cpu_to_le16(0); | |
116 | err = write_blk(info, blk, buf); | |
117 | if (err < 0) | |
118 | return err; | |
119 | info->dqi_free_blk = blk; | |
120 | mark_info_dirty(info->dqi_sb, info->dqi_type); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | /* Remove given block from the list of blocks with free entries */ | |
268157ba JK |
125 | static int remove_free_dqentry(struct qtree_mem_dqinfo *info, char *buf, |
126 | uint blk) | |
1ccd14b9 | 127 | { |
d26ac1a8 | 128 | char *tmpbuf = getdqbuf(info->dqi_usable_bs); |
1ccd14b9 JK |
129 | struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf; |
130 | uint nextblk = le32_to_cpu(dh->dqdh_next_free); | |
131 | uint prevblk = le32_to_cpu(dh->dqdh_prev_free); | |
132 | int err; | |
133 | ||
134 | if (!tmpbuf) | |
135 | return -ENOMEM; | |
136 | if (nextblk) { | |
137 | err = read_blk(info, nextblk, tmpbuf); | |
138 | if (err < 0) | |
139 | goto out_buf; | |
140 | ((struct qt_disk_dqdbheader *)tmpbuf)->dqdh_prev_free = | |
141 | dh->dqdh_prev_free; | |
142 | err = write_blk(info, nextblk, tmpbuf); | |
143 | if (err < 0) | |
144 | goto out_buf; | |
145 | } | |
146 | if (prevblk) { | |
147 | err = read_blk(info, prevblk, tmpbuf); | |
148 | if (err < 0) | |
149 | goto out_buf; | |
150 | ((struct qt_disk_dqdbheader *)tmpbuf)->dqdh_next_free = | |
151 | dh->dqdh_next_free; | |
152 | err = write_blk(info, prevblk, tmpbuf); | |
153 | if (err < 0) | |
154 | goto out_buf; | |
155 | } else { | |
156 | info->dqi_free_entry = nextblk; | |
157 | mark_info_dirty(info->dqi_sb, info->dqi_type); | |
158 | } | |
d26ac1a8 | 159 | kfree(tmpbuf); |
1ccd14b9 JK |
160 | dh->dqdh_next_free = dh->dqdh_prev_free = cpu_to_le32(0); |
161 | /* No matter whether write succeeds block is out of list */ | |
162 | if (write_blk(info, blk, buf) < 0) | |
fb5ffb0e JZ |
163 | quota_error(info->dqi_sb, "Can't write block (%u) " |
164 | "with free entries", blk); | |
1ccd14b9 JK |
165 | return 0; |
166 | out_buf: | |
d26ac1a8 | 167 | kfree(tmpbuf); |
1ccd14b9 JK |
168 | return err; |
169 | } | |
170 | ||
171 | /* Insert given block to the beginning of list with free entries */ | |
268157ba JK |
172 | static int insert_free_dqentry(struct qtree_mem_dqinfo *info, char *buf, |
173 | uint blk) | |
1ccd14b9 | 174 | { |
d26ac1a8 | 175 | char *tmpbuf = getdqbuf(info->dqi_usable_bs); |
1ccd14b9 JK |
176 | struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf; |
177 | int err; | |
178 | ||
179 | if (!tmpbuf) | |
180 | return -ENOMEM; | |
181 | dh->dqdh_next_free = cpu_to_le32(info->dqi_free_entry); | |
182 | dh->dqdh_prev_free = cpu_to_le32(0); | |
183 | err = write_blk(info, blk, buf); | |
184 | if (err < 0) | |
185 | goto out_buf; | |
186 | if (info->dqi_free_entry) { | |
187 | err = read_blk(info, info->dqi_free_entry, tmpbuf); | |
188 | if (err < 0) | |
189 | goto out_buf; | |
190 | ((struct qt_disk_dqdbheader *)tmpbuf)->dqdh_prev_free = | |
191 | cpu_to_le32(blk); | |
192 | err = write_blk(info, info->dqi_free_entry, tmpbuf); | |
193 | if (err < 0) | |
194 | goto out_buf; | |
195 | } | |
d26ac1a8 | 196 | kfree(tmpbuf); |
1ccd14b9 JK |
197 | info->dqi_free_entry = blk; |
198 | mark_info_dirty(info->dqi_sb, info->dqi_type); | |
199 | return 0; | |
200 | out_buf: | |
d26ac1a8 | 201 | kfree(tmpbuf); |
1ccd14b9 JK |
202 | return err; |
203 | } | |
204 | ||
205 | /* Is the entry in the block free? */ | |
206 | int qtree_entry_unused(struct qtree_mem_dqinfo *info, char *disk) | |
207 | { | |
208 | int i; | |
209 | ||
210 | for (i = 0; i < info->dqi_entry_size; i++) | |
211 | if (disk[i]) | |
212 | return 0; | |
213 | return 1; | |
214 | } | |
215 | EXPORT_SYMBOL(qtree_entry_unused); | |
216 | ||
217 | /* Find space for dquot */ | |
218 | static uint find_free_dqentry(struct qtree_mem_dqinfo *info, | |
219 | struct dquot *dquot, int *err) | |
220 | { | |
221 | uint blk, i; | |
222 | struct qt_disk_dqdbheader *dh; | |
d26ac1a8 | 223 | char *buf = getdqbuf(info->dqi_usable_bs); |
1ccd14b9 JK |
224 | char *ddquot; |
225 | ||
226 | *err = 0; | |
227 | if (!buf) { | |
228 | *err = -ENOMEM; | |
229 | return 0; | |
230 | } | |
231 | dh = (struct qt_disk_dqdbheader *)buf; | |
232 | if (info->dqi_free_entry) { | |
233 | blk = info->dqi_free_entry; | |
234 | *err = read_blk(info, blk, buf); | |
235 | if (*err < 0) | |
236 | goto out_buf; | |
237 | } else { | |
238 | blk = get_free_dqblk(info); | |
239 | if ((int)blk < 0) { | |
240 | *err = blk; | |
d26ac1a8 | 241 | kfree(buf); |
1ccd14b9 JK |
242 | return 0; |
243 | } | |
244 | memset(buf, 0, info->dqi_usable_bs); | |
268157ba JK |
245 | /* This is enough as the block is already zeroed and the entry |
246 | * list is empty... */ | |
1ccd14b9 | 247 | info->dqi_free_entry = blk; |
4c376dca | 248 | mark_info_dirty(dquot->dq_sb, dquot->dq_id.type); |
1ccd14b9 JK |
249 | } |
250 | /* Block will be full? */ | |
251 | if (le16_to_cpu(dh->dqdh_entries) + 1 >= qtree_dqstr_in_blk(info)) { | |
252 | *err = remove_free_dqentry(info, buf, blk); | |
253 | if (*err < 0) { | |
fb5ffb0e JZ |
254 | quota_error(dquot->dq_sb, "Can't remove block (%u) " |
255 | "from entry free list", blk); | |
1ccd14b9 JK |
256 | goto out_buf; |
257 | } | |
258 | } | |
259 | le16_add_cpu(&dh->dqdh_entries, 1); | |
260 | /* Find free structure in block */ | |
268157ba JK |
261 | ddquot = buf + sizeof(struct qt_disk_dqdbheader); |
262 | for (i = 0; i < qtree_dqstr_in_blk(info); i++) { | |
263 | if (qtree_entry_unused(info, ddquot)) | |
264 | break; | |
265 | ddquot += info->dqi_entry_size; | |
266 | } | |
1ccd14b9 JK |
267 | #ifdef __QUOTA_QT_PARANOIA |
268 | if (i == qtree_dqstr_in_blk(info)) { | |
fb5ffb0e | 269 | quota_error(dquot->dq_sb, "Data block full but it shouldn't"); |
1ccd14b9 JK |
270 | *err = -EIO; |
271 | goto out_buf; | |
272 | } | |
273 | #endif | |
274 | *err = write_blk(info, blk, buf); | |
275 | if (*err < 0) { | |
fb5ffb0e JZ |
276 | quota_error(dquot->dq_sb, "Can't write quota data block %u", |
277 | blk); | |
1ccd14b9 JK |
278 | goto out_buf; |
279 | } | |
280 | dquot->dq_off = (blk << info->dqi_blocksize_bits) + | |
281 | sizeof(struct qt_disk_dqdbheader) + | |
282 | i * info->dqi_entry_size; | |
d26ac1a8 | 283 | kfree(buf); |
1ccd14b9 JK |
284 | return blk; |
285 | out_buf: | |
d26ac1a8 | 286 | kfree(buf); |
1ccd14b9 JK |
287 | return 0; |
288 | } | |
289 | ||
290 | /* Insert reference to structure into the trie */ | |
291 | static int do_insert_tree(struct qtree_mem_dqinfo *info, struct dquot *dquot, | |
292 | uint *treeblk, int depth) | |
293 | { | |
d26ac1a8 | 294 | char *buf = getdqbuf(info->dqi_usable_bs); |
1ccd14b9 JK |
295 | int ret = 0, newson = 0, newact = 0; |
296 | __le32 *ref; | |
297 | uint newblk; | |
298 | ||
299 | if (!buf) | |
300 | return -ENOMEM; | |
301 | if (!*treeblk) { | |
302 | ret = get_free_dqblk(info); | |
303 | if (ret < 0) | |
304 | goto out_buf; | |
305 | *treeblk = ret; | |
306 | memset(buf, 0, info->dqi_usable_bs); | |
307 | newact = 1; | |
308 | } else { | |
309 | ret = read_blk(info, *treeblk, buf); | |
310 | if (ret < 0) { | |
fb5ffb0e JZ |
311 | quota_error(dquot->dq_sb, "Can't read tree quota " |
312 | "block %u", *treeblk); | |
1ccd14b9 JK |
313 | goto out_buf; |
314 | } | |
315 | } | |
316 | ref = (__le32 *)buf; | |
317 | newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]); | |
318 | if (!newblk) | |
319 | newson = 1; | |
320 | if (depth == info->dqi_qtree_depth - 1) { | |
321 | #ifdef __QUOTA_QT_PARANOIA | |
322 | if (newblk) { | |
fb5ffb0e JZ |
323 | quota_error(dquot->dq_sb, "Inserting already present " |
324 | "quota entry (block %u)", | |
325 | le32_to_cpu(ref[get_index(info, | |
1ccd14b9 JK |
326 | dquot->dq_id, depth)])); |
327 | ret = -EIO; | |
328 | goto out_buf; | |
329 | } | |
330 | #endif | |
331 | newblk = find_free_dqentry(info, dquot, &ret); | |
332 | } else { | |
333 | ret = do_insert_tree(info, dquot, &newblk, depth+1); | |
334 | } | |
335 | if (newson && ret >= 0) { | |
336 | ref[get_index(info, dquot->dq_id, depth)] = | |
337 | cpu_to_le32(newblk); | |
338 | ret = write_blk(info, *treeblk, buf); | |
339 | } else if (newact && ret < 0) { | |
340 | put_free_dqblk(info, buf, *treeblk); | |
341 | } | |
342 | out_buf: | |
d26ac1a8 | 343 | kfree(buf); |
1ccd14b9 JK |
344 | return ret; |
345 | } | |
346 | ||
347 | /* Wrapper for inserting quota structure into tree */ | |
348 | static inline int dq_insert_tree(struct qtree_mem_dqinfo *info, | |
349 | struct dquot *dquot) | |
350 | { | |
351 | int tmp = QT_TREEOFF; | |
352 | return do_insert_tree(info, dquot, &tmp, 0); | |
353 | } | |
354 | ||
355 | /* | |
268157ba JK |
356 | * We don't have to be afraid of deadlocks as we never have quotas on quota |
357 | * files... | |
1ccd14b9 JK |
358 | */ |
359 | int qtree_write_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot) | |
360 | { | |
4c376dca | 361 | int type = dquot->dq_id.type; |
1ccd14b9 JK |
362 | struct super_block *sb = dquot->dq_sb; |
363 | ssize_t ret; | |
d26ac1a8 | 364 | char *ddquot = getdqbuf(info->dqi_entry_size); |
1ccd14b9 JK |
365 | |
366 | if (!ddquot) | |
367 | return -ENOMEM; | |
368 | ||
369 | /* dq_off is guarded by dqio_mutex */ | |
370 | if (!dquot->dq_off) { | |
371 | ret = dq_insert_tree(info, dquot); | |
372 | if (ret < 0) { | |
fb5ffb0e JZ |
373 | quota_error(sb, "Error %zd occurred while creating " |
374 | "quota", ret); | |
d26ac1a8 | 375 | kfree(ddquot); |
1ccd14b9 JK |
376 | return ret; |
377 | } | |
378 | } | |
379 | spin_lock(&dq_data_lock); | |
380 | info->dqi_ops->mem2disk_dqblk(ddquot, dquot); | |
381 | spin_unlock(&dq_data_lock); | |
d26ac1a8 JK |
382 | ret = sb->s_op->quota_write(sb, type, ddquot, info->dqi_entry_size, |
383 | dquot->dq_off); | |
1ccd14b9 | 384 | if (ret != info->dqi_entry_size) { |
fb5ffb0e | 385 | quota_error(sb, "dquota write failed"); |
1ccd14b9 JK |
386 | if (ret >= 0) |
387 | ret = -ENOSPC; | |
388 | } else { | |
389 | ret = 0; | |
390 | } | |
dde95888 | 391 | dqstats_inc(DQST_WRITES); |
d26ac1a8 | 392 | kfree(ddquot); |
1ccd14b9 JK |
393 | |
394 | return ret; | |
395 | } | |
396 | EXPORT_SYMBOL(qtree_write_dquot); | |
397 | ||
398 | /* Free dquot entry in data block */ | |
399 | static int free_dqentry(struct qtree_mem_dqinfo *info, struct dquot *dquot, | |
400 | uint blk) | |
401 | { | |
402 | struct qt_disk_dqdbheader *dh; | |
d26ac1a8 | 403 | char *buf = getdqbuf(info->dqi_usable_bs); |
1ccd14b9 JK |
404 | int ret = 0; |
405 | ||
406 | if (!buf) | |
407 | return -ENOMEM; | |
408 | if (dquot->dq_off >> info->dqi_blocksize_bits != blk) { | |
fb5ffb0e JZ |
409 | quota_error(dquot->dq_sb, "Quota structure has offset to " |
410 | "other block (%u) than it should (%u)", blk, | |
411 | (uint)(dquot->dq_off >> info->dqi_blocksize_bits)); | |
1ccd14b9 JK |
412 | goto out_buf; |
413 | } | |
414 | ret = read_blk(info, blk, buf); | |
415 | if (ret < 0) { | |
fb5ffb0e JZ |
416 | quota_error(dquot->dq_sb, "Can't read quota data block %u", |
417 | blk); | |
1ccd14b9 JK |
418 | goto out_buf; |
419 | } | |
420 | dh = (struct qt_disk_dqdbheader *)buf; | |
421 | le16_add_cpu(&dh->dqdh_entries, -1); | |
422 | if (!le16_to_cpu(dh->dqdh_entries)) { /* Block got free? */ | |
423 | ret = remove_free_dqentry(info, buf, blk); | |
424 | if (ret >= 0) | |
425 | ret = put_free_dqblk(info, buf, blk); | |
426 | if (ret < 0) { | |
fb5ffb0e JZ |
427 | quota_error(dquot->dq_sb, "Can't move quota data block " |
428 | "(%u) to free list", blk); | |
1ccd14b9 JK |
429 | goto out_buf; |
430 | } | |
431 | } else { | |
432 | memset(buf + | |
433 | (dquot->dq_off & ((1 << info->dqi_blocksize_bits) - 1)), | |
434 | 0, info->dqi_entry_size); | |
435 | if (le16_to_cpu(dh->dqdh_entries) == | |
436 | qtree_dqstr_in_blk(info) - 1) { | |
437 | /* Insert will write block itself */ | |
438 | ret = insert_free_dqentry(info, buf, blk); | |
439 | if (ret < 0) { | |
fb5ffb0e JZ |
440 | quota_error(dquot->dq_sb, "Can't insert quota " |
441 | "data block (%u) to free entry list", blk); | |
1ccd14b9 JK |
442 | goto out_buf; |
443 | } | |
444 | } else { | |
445 | ret = write_blk(info, blk, buf); | |
446 | if (ret < 0) { | |
fb5ffb0e JZ |
447 | quota_error(dquot->dq_sb, "Can't write quota " |
448 | "data block %u", blk); | |
1ccd14b9 JK |
449 | goto out_buf; |
450 | } | |
451 | } | |
452 | } | |
453 | dquot->dq_off = 0; /* Quota is now unattached */ | |
454 | out_buf: | |
d26ac1a8 | 455 | kfree(buf); |
1ccd14b9 JK |
456 | return ret; |
457 | } | |
458 | ||
459 | /* Remove reference to dquot from tree */ | |
460 | static int remove_tree(struct qtree_mem_dqinfo *info, struct dquot *dquot, | |
461 | uint *blk, int depth) | |
462 | { | |
d26ac1a8 | 463 | char *buf = getdqbuf(info->dqi_usable_bs); |
1ccd14b9 JK |
464 | int ret = 0; |
465 | uint newblk; | |
466 | __le32 *ref = (__le32 *)buf; | |
467 | ||
468 | if (!buf) | |
469 | return -ENOMEM; | |
470 | ret = read_blk(info, *blk, buf); | |
471 | if (ret < 0) { | |
055adcbd JP |
472 | quota_error(dquot->dq_sb, "Can't read quota data block %u", |
473 | *blk); | |
1ccd14b9 JK |
474 | goto out_buf; |
475 | } | |
476 | newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]); | |
477 | if (depth == info->dqi_qtree_depth - 1) { | |
478 | ret = free_dqentry(info, dquot, newblk); | |
479 | newblk = 0; | |
480 | } else { | |
481 | ret = remove_tree(info, dquot, &newblk, depth+1); | |
482 | } | |
483 | if (ret >= 0 && !newblk) { | |
484 | int i; | |
485 | ref[get_index(info, dquot->dq_id, depth)] = cpu_to_le32(0); | |
486 | /* Block got empty? */ | |
d26ac1a8 JK |
487 | for (i = 0; i < (info->dqi_usable_bs >> 2) && !ref[i]; i++) |
488 | ; | |
1ccd14b9 JK |
489 | /* Don't put the root block into the free block list */ |
490 | if (i == (info->dqi_usable_bs >> 2) | |
491 | && *blk != QT_TREEOFF) { | |
492 | put_free_dqblk(info, buf, *blk); | |
493 | *blk = 0; | |
494 | } else { | |
495 | ret = write_blk(info, *blk, buf); | |
496 | if (ret < 0) | |
055adcbd JP |
497 | quota_error(dquot->dq_sb, |
498 | "Can't write quota tree block %u", | |
499 | *blk); | |
1ccd14b9 JK |
500 | } |
501 | } | |
502 | out_buf: | |
d26ac1a8 | 503 | kfree(buf); |
1ccd14b9 JK |
504 | return ret; |
505 | } | |
506 | ||
507 | /* Delete dquot from tree */ | |
508 | int qtree_delete_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot) | |
509 | { | |
510 | uint tmp = QT_TREEOFF; | |
511 | ||
512 | if (!dquot->dq_off) /* Even not allocated? */ | |
513 | return 0; | |
514 | return remove_tree(info, dquot, &tmp, 0); | |
515 | } | |
516 | EXPORT_SYMBOL(qtree_delete_dquot); | |
517 | ||
518 | /* Find entry in block */ | |
519 | static loff_t find_block_dqentry(struct qtree_mem_dqinfo *info, | |
520 | struct dquot *dquot, uint blk) | |
521 | { | |
d26ac1a8 | 522 | char *buf = getdqbuf(info->dqi_usable_bs); |
1ccd14b9 JK |
523 | loff_t ret = 0; |
524 | int i; | |
525 | char *ddquot; | |
526 | ||
527 | if (!buf) | |
528 | return -ENOMEM; | |
529 | ret = read_blk(info, blk, buf); | |
530 | if (ret < 0) { | |
fb5ffb0e JZ |
531 | quota_error(dquot->dq_sb, "Can't read quota tree " |
532 | "block %u", blk); | |
1ccd14b9 JK |
533 | goto out_buf; |
534 | } | |
268157ba JK |
535 | ddquot = buf + sizeof(struct qt_disk_dqdbheader); |
536 | for (i = 0; i < qtree_dqstr_in_blk(info); i++) { | |
537 | if (info->dqi_ops->is_id(ddquot, dquot)) | |
538 | break; | |
539 | ddquot += info->dqi_entry_size; | |
540 | } | |
1ccd14b9 | 541 | if (i == qtree_dqstr_in_blk(info)) { |
4c376dca EB |
542 | quota_error(dquot->dq_sb, |
543 | "Quota for id %u referenced but not present", | |
544 | from_kqid(&init_user_ns, dquot->dq_id)); | |
1ccd14b9 JK |
545 | ret = -EIO; |
546 | goto out_buf; | |
547 | } else { | |
548 | ret = (blk << info->dqi_blocksize_bits) + sizeof(struct | |
549 | qt_disk_dqdbheader) + i * info->dqi_entry_size; | |
550 | } | |
551 | out_buf: | |
d26ac1a8 | 552 | kfree(buf); |
1ccd14b9 JK |
553 | return ret; |
554 | } | |
555 | ||
556 | /* Find entry for given id in the tree */ | |
557 | static loff_t find_tree_dqentry(struct qtree_mem_dqinfo *info, | |
558 | struct dquot *dquot, uint blk, int depth) | |
559 | { | |
d26ac1a8 | 560 | char *buf = getdqbuf(info->dqi_usable_bs); |
1ccd14b9 JK |
561 | loff_t ret = 0; |
562 | __le32 *ref = (__le32 *)buf; | |
563 | ||
564 | if (!buf) | |
565 | return -ENOMEM; | |
566 | ret = read_blk(info, blk, buf); | |
567 | if (ret < 0) { | |
fb5ffb0e JZ |
568 | quota_error(dquot->dq_sb, "Can't read quota tree block %u", |
569 | blk); | |
1ccd14b9 JK |
570 | goto out_buf; |
571 | } | |
572 | ret = 0; | |
573 | blk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]); | |
574 | if (!blk) /* No reference? */ | |
575 | goto out_buf; | |
576 | if (depth < info->dqi_qtree_depth - 1) | |
577 | ret = find_tree_dqentry(info, dquot, blk, depth+1); | |
578 | else | |
579 | ret = find_block_dqentry(info, dquot, blk); | |
580 | out_buf: | |
d26ac1a8 | 581 | kfree(buf); |
1ccd14b9 JK |
582 | return ret; |
583 | } | |
584 | ||
585 | /* Find entry for given id in the tree - wrapper function */ | |
586 | static inline loff_t find_dqentry(struct qtree_mem_dqinfo *info, | |
587 | struct dquot *dquot) | |
588 | { | |
589 | return find_tree_dqentry(info, dquot, QT_TREEOFF, 0); | |
590 | } | |
591 | ||
592 | int qtree_read_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot) | |
593 | { | |
4c376dca | 594 | int type = dquot->dq_id.type; |
1ccd14b9 JK |
595 | struct super_block *sb = dquot->dq_sb; |
596 | loff_t offset; | |
d26ac1a8 | 597 | char *ddquot; |
1ccd14b9 JK |
598 | int ret = 0; |
599 | ||
600 | #ifdef __QUOTA_QT_PARANOIA | |
601 | /* Invalidated quota? */ | |
602 | if (!sb_dqopt(dquot->dq_sb)->files[type]) { | |
fb5ffb0e | 603 | quota_error(sb, "Quota invalidated while reading!"); |
1ccd14b9 JK |
604 | return -EIO; |
605 | } | |
606 | #endif | |
607 | /* Do we know offset of the dquot entry in the quota file? */ | |
608 | if (!dquot->dq_off) { | |
609 | offset = find_dqentry(info, dquot); | |
610 | if (offset <= 0) { /* Entry not present? */ | |
611 | if (offset < 0) | |
4c376dca EB |
612 | quota_error(sb,"Can't read quota structure " |
613 | "for id %u", | |
614 | from_kqid(&init_user_ns, | |
615 | dquot->dq_id)); | |
1ccd14b9 JK |
616 | dquot->dq_off = 0; |
617 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
618 | memset(&dquot->dq_dqb, 0, sizeof(struct mem_dqblk)); | |
619 | ret = offset; | |
620 | goto out; | |
621 | } | |
622 | dquot->dq_off = offset; | |
623 | } | |
624 | ddquot = getdqbuf(info->dqi_entry_size); | |
625 | if (!ddquot) | |
626 | return -ENOMEM; | |
d26ac1a8 JK |
627 | ret = sb->s_op->quota_read(sb, type, ddquot, info->dqi_entry_size, |
628 | dquot->dq_off); | |
1ccd14b9 JK |
629 | if (ret != info->dqi_entry_size) { |
630 | if (ret >= 0) | |
631 | ret = -EIO; | |
fb5ffb0e | 632 | quota_error(sb, "Error while reading quota structure for id %u", |
4c376dca | 633 | from_kqid(&init_user_ns, dquot->dq_id)); |
1ccd14b9 JK |
634 | set_bit(DQ_FAKE_B, &dquot->dq_flags); |
635 | memset(&dquot->dq_dqb, 0, sizeof(struct mem_dqblk)); | |
d26ac1a8 | 636 | kfree(ddquot); |
1ccd14b9 JK |
637 | goto out; |
638 | } | |
639 | spin_lock(&dq_data_lock); | |
640 | info->dqi_ops->disk2mem_dqblk(dquot, ddquot); | |
641 | if (!dquot->dq_dqb.dqb_bhardlimit && | |
642 | !dquot->dq_dqb.dqb_bsoftlimit && | |
643 | !dquot->dq_dqb.dqb_ihardlimit && | |
644 | !dquot->dq_dqb.dqb_isoftlimit) | |
645 | set_bit(DQ_FAKE_B, &dquot->dq_flags); | |
646 | spin_unlock(&dq_data_lock); | |
d26ac1a8 | 647 | kfree(ddquot); |
1ccd14b9 | 648 | out: |
dde95888 | 649 | dqstats_inc(DQST_READS); |
1ccd14b9 JK |
650 | return ret; |
651 | } | |
652 | EXPORT_SYMBOL(qtree_read_dquot); | |
653 | ||
654 | /* Check whether dquot should not be deleted. We know we are | |
655 | * the only one operating on dquot (thanks to dq_lock) */ | |
656 | int qtree_release_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot) | |
657 | { | |
268157ba JK |
658 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) && |
659 | !(dquot->dq_dqb.dqb_curinodes | dquot->dq_dqb.dqb_curspace)) | |
1ccd14b9 JK |
660 | return qtree_delete_dquot(info, dquot); |
661 | return 0; | |
662 | } | |
663 | EXPORT_SYMBOL(qtree_release_dquot); |