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8#include <linux/statfs.h>
9
10#include "super.h"
11#include "mds_client.h"
12
13void ceph_adjust_quota_realms_count(struct inode *inode, bool inc)
14{
15 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
16 if (inc)
17 atomic64_inc(&mdsc->quotarealms_count);
18 else
19 atomic64_dec(&mdsc->quotarealms_count);
20}
21
22static inline bool ceph_has_realms_with_quotas(struct inode *inode)
23{
24 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
25 struct super_block *sb = mdsc->fsc->sb;
26 struct inode *root = d_inode(sb->s_root);
27
28 if (atomic64_read(&mdsc->quotarealms_count) > 0)
29 return true;
30
31 if (root && ceph_ino(root) == CEPH_INO_ROOT)
32 return false;
33
34 return true;
35}
36
37void ceph_handle_quota(struct ceph_mds_client *mdsc,
38 struct ceph_mds_session *session,
39 struct ceph_msg *msg)
40{
41 struct super_block *sb = mdsc->fsc->sb;
42 struct ceph_mds_quota *h = msg->front.iov_base;
43 struct ceph_vino vino;
44 struct inode *inode;
45 struct ceph_inode_info *ci;
46
47 if (msg->front.iov_len < sizeof(*h)) {
48 pr_err("%s corrupt message mds%d len %d\n", __func__,
49 session->s_mds, (int)msg->front.iov_len);
50 ceph_msg_dump(msg);
51 return;
52 }
53
54
55 mutex_lock(&session->s_mutex);
56 session->s_seq++;
57 mutex_unlock(&session->s_mutex);
58
59
60 vino.ino = le64_to_cpu(h->ino);
61 vino.snap = CEPH_NOSNAP;
62 inode = ceph_find_inode(sb, vino);
63 if (!inode) {
64 pr_warn("Failed to find inode %llu\n", vino.ino);
65 return;
66 }
67 ci = ceph_inode(inode);
68
69 spin_lock(&ci->i_ceph_lock);
70 ci->i_rbytes = le64_to_cpu(h->rbytes);
71 ci->i_rfiles = le64_to_cpu(h->rfiles);
72 ci->i_rsubdirs = le64_to_cpu(h->rsubdirs);
73 __ceph_update_quota(ci, le64_to_cpu(h->max_bytes),
74 le64_to_cpu(h->max_files));
75 spin_unlock(&ci->i_ceph_lock);
76
77
78 ceph_async_iput(inode);
79}
80
81static struct ceph_quotarealm_inode *
82find_quotarealm_inode(struct ceph_mds_client *mdsc, u64 ino)
83{
84 struct ceph_quotarealm_inode *qri = NULL;
85 struct rb_node **node, *parent = NULL;
86
87 mutex_lock(&mdsc->quotarealms_inodes_mutex);
88 node = &(mdsc->quotarealms_inodes.rb_node);
89 while (*node) {
90 parent = *node;
91 qri = container_of(*node, struct ceph_quotarealm_inode, node);
92
93 if (ino < qri->ino)
94 node = &((*node)->rb_left);
95 else if (ino > qri->ino)
96 node = &((*node)->rb_right);
97 else
98 break;
99 }
100 if (!qri || (qri->ino != ino)) {
101
102 qri = kmalloc(sizeof(*qri), GFP_KERNEL);
103 if (qri) {
104 qri->ino = ino;
105 qri->inode = NULL;
106 qri->timeout = 0;
107 mutex_init(&qri->mutex);
108 rb_link_node(&qri->node, parent, node);
109 rb_insert_color(&qri->node, &mdsc->quotarealms_inodes);
110 } else
111 pr_warn("Failed to alloc quotarealms_inode\n");
112 }
113 mutex_unlock(&mdsc->quotarealms_inodes_mutex);
114
115 return qri;
116}
117
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123
124
125
126static struct inode *lookup_quotarealm_inode(struct ceph_mds_client *mdsc,
127 struct super_block *sb,
128 struct ceph_snap_realm *realm)
129{
130 struct ceph_quotarealm_inode *qri;
131 struct inode *in;
132
133 qri = find_quotarealm_inode(mdsc, realm->ino);
134 if (!qri)
135 return NULL;
136
137 mutex_lock(&qri->mutex);
138 if (qri->inode && ceph_is_any_caps(qri->inode)) {
139
140 mutex_unlock(&qri->mutex);
141 return qri->inode;
142 }
143
144 if (qri->timeout &&
145 time_before_eq(jiffies, qri->timeout)) {
146 mutex_unlock(&qri->mutex);
147 return NULL;
148 }
149 if (qri->inode) {
150
151 int ret = __ceph_do_getattr(qri->inode, NULL,
152 CEPH_STAT_CAP_INODE, true);
153 if (ret >= 0)
154 in = qri->inode;
155 else
156 in = ERR_PTR(ret);
157 } else {
158 in = ceph_lookup_inode(sb, realm->ino);
159 }
160
161 if (IS_ERR(in)) {
162 dout("Can't lookup inode %llx (err: %ld)\n",
163 realm->ino, PTR_ERR(in));
164 qri->timeout = jiffies + msecs_to_jiffies(60 * 1000);
165 } else {
166 qri->timeout = 0;
167 qri->inode = in;
168 }
169 mutex_unlock(&qri->mutex);
170
171 return in;
172}
173
174void ceph_cleanup_quotarealms_inodes(struct ceph_mds_client *mdsc)
175{
176 struct ceph_quotarealm_inode *qri;
177 struct rb_node *node;
178
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182
183 mutex_lock(&mdsc->quotarealms_inodes_mutex);
184 while (!RB_EMPTY_ROOT(&mdsc->quotarealms_inodes)) {
185 node = rb_first(&mdsc->quotarealms_inodes);
186 qri = rb_entry(node, struct ceph_quotarealm_inode, node);
187 rb_erase(node, &mdsc->quotarealms_inodes);
188 iput(qri->inode);
189 kfree(qri);
190 }
191 mutex_unlock(&mdsc->quotarealms_inodes_mutex);
192}
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208
209static struct ceph_snap_realm *get_quota_realm(struct ceph_mds_client *mdsc,
210 struct inode *inode, bool retry)
211{
212 struct ceph_inode_info *ci = NULL;
213 struct ceph_snap_realm *realm, *next;
214 struct inode *in;
215 bool has_quota;
216
217 if (ceph_snap(inode) != CEPH_NOSNAP)
218 return NULL;
219
220restart:
221 realm = ceph_inode(inode)->i_snap_realm;
222 if (realm)
223 ceph_get_snap_realm(mdsc, realm);
224 else
225 pr_err_ratelimited("get_quota_realm: ino (%llx.%llx) "
226 "null i_snap_realm\n", ceph_vinop(inode));
227 while (realm) {
228 bool has_inode;
229
230 spin_lock(&realm->inodes_with_caps_lock);
231 has_inode = realm->inode;
232 in = has_inode ? igrab(realm->inode) : NULL;
233 spin_unlock(&realm->inodes_with_caps_lock);
234 if (has_inode && !in)
235 break;
236 if (!in) {
237 up_read(&mdsc->snap_rwsem);
238 in = lookup_quotarealm_inode(mdsc, inode->i_sb, realm);
239 down_read(&mdsc->snap_rwsem);
240 if (IS_ERR_OR_NULL(in))
241 break;
242 ceph_put_snap_realm(mdsc, realm);
243 if (!retry)
244 return ERR_PTR(-EAGAIN);
245 goto restart;
246 }
247
248 ci = ceph_inode(in);
249 has_quota = __ceph_has_any_quota(ci);
250
251 ceph_async_iput(in);
252
253 next = realm->parent;
254 if (has_quota || !next)
255 return realm;
256
257 ceph_get_snap_realm(mdsc, next);
258 ceph_put_snap_realm(mdsc, realm);
259 realm = next;
260 }
261 if (realm)
262 ceph_put_snap_realm(mdsc, realm);
263
264 return NULL;
265}
266
267static bool ceph_quota_is_same_realm(struct inode *old, struct inode *new)
268{
269 struct ceph_mds_client *mdsc = ceph_inode_to_client(old)->mdsc;
270 struct ceph_snap_realm *old_realm, *new_realm;
271 bool is_same;
272
273restart:
274
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279
280 down_read(&mdsc->snap_rwsem);
281 old_realm = get_quota_realm(mdsc, old, true);
282 new_realm = get_quota_realm(mdsc, new, false);
283 if (PTR_ERR(new_realm) == -EAGAIN) {
284 up_read(&mdsc->snap_rwsem);
285 if (old_realm)
286 ceph_put_snap_realm(mdsc, old_realm);
287 goto restart;
288 }
289 is_same = (old_realm == new_realm);
290 up_read(&mdsc->snap_rwsem);
291
292 if (old_realm)
293 ceph_put_snap_realm(mdsc, old_realm);
294 if (new_realm)
295 ceph_put_snap_realm(mdsc, new_realm);
296
297 return is_same;
298}
299
300enum quota_check_op {
301 QUOTA_CHECK_MAX_FILES_OP,
302 QUOTA_CHECK_MAX_BYTES_OP,
303 QUOTA_CHECK_MAX_BYTES_APPROACHING_OP
304
305};
306
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312
313static bool check_quota_exceeded(struct inode *inode, enum quota_check_op op,
314 loff_t delta)
315{
316 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
317 struct ceph_inode_info *ci;
318 struct ceph_snap_realm *realm, *next;
319 struct inode *in;
320 u64 max, rvalue;
321 bool exceeded = false;
322
323 if (ceph_snap(inode) != CEPH_NOSNAP)
324 return false;
325
326 down_read(&mdsc->snap_rwsem);
327restart:
328 realm = ceph_inode(inode)->i_snap_realm;
329 if (realm)
330 ceph_get_snap_realm(mdsc, realm);
331 else
332 pr_err_ratelimited("check_quota_exceeded: ino (%llx.%llx) "
333 "null i_snap_realm\n", ceph_vinop(inode));
334 while (realm) {
335 bool has_inode;
336
337 spin_lock(&realm->inodes_with_caps_lock);
338 has_inode = realm->inode;
339 in = has_inode ? igrab(realm->inode) : NULL;
340 spin_unlock(&realm->inodes_with_caps_lock);
341 if (has_inode && !in)
342 break;
343 if (!in) {
344 up_read(&mdsc->snap_rwsem);
345 in = lookup_quotarealm_inode(mdsc, inode->i_sb, realm);
346 down_read(&mdsc->snap_rwsem);
347 if (IS_ERR_OR_NULL(in))
348 break;
349 ceph_put_snap_realm(mdsc, realm);
350 goto restart;
351 }
352 ci = ceph_inode(in);
353 spin_lock(&ci->i_ceph_lock);
354 if (op == QUOTA_CHECK_MAX_FILES_OP) {
355 max = ci->i_max_files;
356 rvalue = ci->i_rfiles + ci->i_rsubdirs;
357 } else {
358 max = ci->i_max_bytes;
359 rvalue = ci->i_rbytes;
360 }
361 spin_unlock(&ci->i_ceph_lock);
362 switch (op) {
363 case QUOTA_CHECK_MAX_FILES_OP:
364 case QUOTA_CHECK_MAX_BYTES_OP:
365 exceeded = (max && (rvalue + delta > max));
366 break;
367 case QUOTA_CHECK_MAX_BYTES_APPROACHING_OP:
368 if (max) {
369 if (rvalue >= max)
370 exceeded = true;
371 else {
372
373
374
375
376 exceeded =
377 (((max - rvalue) >> 4) < delta);
378 }
379 }
380 break;
381 default:
382
383 pr_warn("Invalid quota check op (%d)\n", op);
384 exceeded = true;
385 }
386
387 ceph_async_iput(in);
388
389 next = realm->parent;
390 if (exceeded || !next)
391 break;
392 ceph_get_snap_realm(mdsc, next);
393 ceph_put_snap_realm(mdsc, realm);
394 realm = next;
395 }
396 if (realm)
397 ceph_put_snap_realm(mdsc, realm);
398 up_read(&mdsc->snap_rwsem);
399
400 return exceeded;
401}
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410
411bool ceph_quota_is_max_files_exceeded(struct inode *inode)
412{
413 if (!ceph_has_realms_with_quotas(inode))
414 return false;
415
416 WARN_ON(!S_ISDIR(inode->i_mode));
417
418 return check_quota_exceeded(inode, QUOTA_CHECK_MAX_FILES_OP, 1);
419}
420
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428
429bool ceph_quota_is_max_bytes_exceeded(struct inode *inode, loff_t newsize)
430{
431 loff_t size = i_size_read(inode);
432
433 if (!ceph_has_realms_with_quotas(inode))
434 return false;
435
436
437 if (newsize <= size)
438 return false;
439
440 return check_quota_exceeded(inode, QUOTA_CHECK_MAX_BYTES_OP, (newsize - size));
441}
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451bool ceph_quota_is_max_bytes_approaching(struct inode *inode, loff_t newsize)
452{
453 loff_t size = ceph_inode(inode)->i_reported_size;
454
455 if (!ceph_has_realms_with_quotas(inode))
456 return false;
457
458
459 if (newsize <= size)
460 return false;
461
462 return check_quota_exceeded(inode, QUOTA_CHECK_MAX_BYTES_APPROACHING_OP,
463 (newsize - size));
464}
465
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475
476bool ceph_quota_update_statfs(struct ceph_fs_client *fsc, struct kstatfs *buf)
477{
478 struct ceph_mds_client *mdsc = fsc->mdsc;
479 struct ceph_inode_info *ci;
480 struct ceph_snap_realm *realm;
481 struct inode *in;
482 u64 total = 0, used, free;
483 bool is_updated = false;
484
485 down_read(&mdsc->snap_rwsem);
486 realm = get_quota_realm(mdsc, d_inode(fsc->sb->s_root), true);
487 up_read(&mdsc->snap_rwsem);
488 if (!realm)
489 return false;
490
491 spin_lock(&realm->inodes_with_caps_lock);
492 in = realm->inode ? igrab(realm->inode) : NULL;
493 spin_unlock(&realm->inodes_with_caps_lock);
494 if (in) {
495 ci = ceph_inode(in);
496 spin_lock(&ci->i_ceph_lock);
497 if (ci->i_max_bytes) {
498 total = ci->i_max_bytes >> CEPH_BLOCK_SHIFT;
499 used = ci->i_rbytes >> CEPH_BLOCK_SHIFT;
500
501
502
503 free = total > used ? total - used : 0;
504 }
505 spin_unlock(&ci->i_ceph_lock);
506 if (total) {
507 buf->f_blocks = total;
508 buf->f_bfree = free;
509 buf->f_bavail = free;
510 is_updated = true;
511 }
512 iput(in);
513 }
514 ceph_put_snap_realm(mdsc, realm);
515
516 return is_updated;
517}
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532
533int ceph_quota_check_rename(struct ceph_mds_client *mdsc,
534 struct inode *old, struct inode *new)
535{
536 struct ceph_inode_info *ci_old = ceph_inode(old);
537 int ret = 0;
538
539 if (ceph_quota_is_same_realm(old, new))
540 return 0;
541
542
543
544
545
546 ret = ceph_do_getattr(new, CEPH_STAT_RSTAT, false);
547 if (ret)
548 return ret;
549
550 if (S_ISDIR(old->i_mode)) {
551 ret = ceph_do_getattr(old, CEPH_STAT_RSTAT, false);
552 if (ret)
553 return ret;
554 ret = check_quota_exceeded(new, QUOTA_CHECK_MAX_BYTES_OP,
555 ci_old->i_rbytes);
556 if (!ret)
557 ret = check_quota_exceeded(new,
558 QUOTA_CHECK_MAX_FILES_OP,
559 ci_old->i_rfiles +
560 ci_old->i_rsubdirs);
561 if (ret)
562 ret = -EXDEV;
563 } else {
564 ret = check_quota_exceeded(new, QUOTA_CHECK_MAX_BYTES_OP,
565 i_size_read(old));
566 if (!ret)
567 ret = check_quota_exceeded(new,
568 QUOTA_CHECK_MAX_FILES_OP, 1);
569 if (ret)
570 ret = -EDQUOT;
571 }
572
573 return ret;
574}
575