dir.c 53 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. #include <linux/ceph/ceph_debug.h>
  3. #include <linux/spinlock.h>
  4. #include <linux/namei.h>
  5. #include <linux/slab.h>
  6. #include <linux/sched.h>
  7. #include <linux/xattr.h>
  8. #include "super.h"
  9. #include "mds_client.h"
  10. /*
  11. * Directory operations: readdir, lookup, create, link, unlink,
  12. * rename, etc.
  13. */
  14. /*
  15. * Ceph MDS operations are specified in terms of a base ino and
  16. * relative path. Thus, the client can specify an operation on a
  17. * specific inode (e.g., a getattr due to fstat(2)), or as a path
  18. * relative to, say, the root directory.
  19. *
  20. * Normally, we limit ourselves to strict inode ops (no path component)
  21. * or dentry operations (a single path component relative to an ino). The
  22. * exception to this is open_root_dentry(), which will open the mount
  23. * point by name.
  24. */
  25. const struct dentry_operations ceph_dentry_ops;
  26. static bool __dentry_lease_is_valid(struct ceph_dentry_info *di);
  27. static int __dir_lease_try_check(const struct dentry *dentry);
  28. /*
  29. * Initialize ceph dentry state.
  30. */
  31. static int ceph_d_init(struct dentry *dentry)
  32. {
  33. struct ceph_dentry_info *di;
  34. struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb);
  35. di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL);
  36. if (!di)
  37. return -ENOMEM; /* oh well */
  38. di->dentry = dentry;
  39. di->lease_session = NULL;
  40. di->time = jiffies;
  41. dentry->d_fsdata = di;
  42. INIT_LIST_HEAD(&di->lease_list);
  43. atomic64_inc(&mdsc->metric.total_dentries);
  44. return 0;
  45. }
  46. /*
  47. * for f_pos for readdir:
  48. * - hash order:
  49. * (0xff << 52) | ((24 bits hash) << 28) |
  50. * (the nth entry has hash collision);
  51. * - frag+name order;
  52. * ((frag value) << 28) | (the nth entry in frag);
  53. */
  54. #define OFFSET_BITS 28
  55. #define OFFSET_MASK ((1 << OFFSET_BITS) - 1)
  56. #define HASH_ORDER (0xffull << (OFFSET_BITS + 24))
  57. loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order)
  58. {
  59. loff_t fpos = ((loff_t)high << 28) | (loff_t)off;
  60. if (hash_order)
  61. fpos |= HASH_ORDER;
  62. return fpos;
  63. }
  64. static bool is_hash_order(loff_t p)
  65. {
  66. return (p & HASH_ORDER) == HASH_ORDER;
  67. }
  68. static unsigned fpos_frag(loff_t p)
  69. {
  70. return p >> OFFSET_BITS;
  71. }
  72. static unsigned fpos_hash(loff_t p)
  73. {
  74. return ceph_frag_value(fpos_frag(p));
  75. }
  76. static unsigned fpos_off(loff_t p)
  77. {
  78. return p & OFFSET_MASK;
  79. }
  80. static int fpos_cmp(loff_t l, loff_t r)
  81. {
  82. int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
  83. if (v)
  84. return v;
  85. return (int)(fpos_off(l) - fpos_off(r));
  86. }
  87. /*
  88. * make note of the last dentry we read, so we can
  89. * continue at the same lexicographical point,
  90. * regardless of what dir changes take place on the
  91. * server.
  92. */
  93. static int note_last_dentry(struct ceph_dir_file_info *dfi, const char *name,
  94. int len, unsigned next_offset)
  95. {
  96. char *buf = kmalloc(len+1, GFP_KERNEL);
  97. if (!buf)
  98. return -ENOMEM;
  99. kfree(dfi->last_name);
  100. dfi->last_name = buf;
  101. memcpy(dfi->last_name, name, len);
  102. dfi->last_name[len] = 0;
  103. dfi->next_offset = next_offset;
  104. dout("note_last_dentry '%s'\n", dfi->last_name);
  105. return 0;
  106. }
  107. static struct dentry *
  108. __dcache_find_get_entry(struct dentry *parent, u64 idx,
  109. struct ceph_readdir_cache_control *cache_ctl)
  110. {
  111. struct inode *dir = d_inode(parent);
  112. struct dentry *dentry;
  113. unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1;
  114. loff_t ptr_pos = idx * sizeof(struct dentry *);
  115. pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT;
  116. if (ptr_pos >= i_size_read(dir))
  117. return NULL;
  118. if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) {
  119. ceph_readdir_cache_release(cache_ctl);
  120. cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff);
  121. if (!cache_ctl->page) {
  122. dout(" page %lu not found\n", ptr_pgoff);
  123. return ERR_PTR(-EAGAIN);
  124. }
  125. /* reading/filling the cache are serialized by
  126. i_rwsem, no need to use page lock */
  127. unlock_page(cache_ctl->page);
  128. cache_ctl->dentries = kmap(cache_ctl->page);
  129. }
  130. cache_ctl->index = idx & idx_mask;
  131. rcu_read_lock();
  132. spin_lock(&parent->d_lock);
  133. /* check i_size again here, because empty directory can be
  134. * marked as complete while not holding the i_rwsem. */
  135. if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir))
  136. dentry = cache_ctl->dentries[cache_ctl->index];
  137. else
  138. dentry = NULL;
  139. spin_unlock(&parent->d_lock);
  140. if (dentry && !lockref_get_not_dead(&dentry->d_lockref))
  141. dentry = NULL;
  142. rcu_read_unlock();
  143. return dentry ? : ERR_PTR(-EAGAIN);
  144. }
  145. /*
  146. * When possible, we try to satisfy a readdir by peeking at the
  147. * dcache. We make this work by carefully ordering dentries on
  148. * d_child when we initially get results back from the MDS, and
  149. * falling back to a "normal" sync readdir if any dentries in the dir
  150. * are dropped.
  151. *
  152. * Complete dir indicates that we have all dentries in the dir. It is
  153. * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
  154. * the MDS if/when the directory is modified).
  155. */
  156. static int __dcache_readdir(struct file *file, struct dir_context *ctx,
  157. int shared_gen)
  158. {
  159. struct ceph_dir_file_info *dfi = file->private_data;
  160. struct dentry *parent = file->f_path.dentry;
  161. struct inode *dir = d_inode(parent);
  162. struct dentry *dentry, *last = NULL;
  163. struct ceph_dentry_info *di;
  164. struct ceph_readdir_cache_control cache_ctl = {};
  165. u64 idx = 0;
  166. int err = 0;
  167. dout("__dcache_readdir %p v%u at %llx\n", dir, (unsigned)shared_gen, ctx->pos);
  168. /* search start position */
  169. if (ctx->pos > 2) {
  170. u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *));
  171. while (count > 0) {
  172. u64 step = count >> 1;
  173. dentry = __dcache_find_get_entry(parent, idx + step,
  174. &cache_ctl);
  175. if (!dentry) {
  176. /* use linar search */
  177. idx = 0;
  178. break;
  179. }
  180. if (IS_ERR(dentry)) {
  181. err = PTR_ERR(dentry);
  182. goto out;
  183. }
  184. di = ceph_dentry(dentry);
  185. spin_lock(&dentry->d_lock);
  186. if (fpos_cmp(di->offset, ctx->pos) < 0) {
  187. idx += step + 1;
  188. count -= step + 1;
  189. } else {
  190. count = step;
  191. }
  192. spin_unlock(&dentry->d_lock);
  193. dput(dentry);
  194. }
  195. dout("__dcache_readdir %p cache idx %llu\n", dir, idx);
  196. }
  197. for (;;) {
  198. bool emit_dentry = false;
  199. dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl);
  200. if (!dentry) {
  201. dfi->file_info.flags |= CEPH_F_ATEND;
  202. err = 0;
  203. break;
  204. }
  205. if (IS_ERR(dentry)) {
  206. err = PTR_ERR(dentry);
  207. goto out;
  208. }
  209. spin_lock(&dentry->d_lock);
  210. di = ceph_dentry(dentry);
  211. if (d_unhashed(dentry) ||
  212. d_really_is_negative(dentry) ||
  213. di->lease_shared_gen != shared_gen) {
  214. spin_unlock(&dentry->d_lock);
  215. dput(dentry);
  216. err = -EAGAIN;
  217. goto out;
  218. }
  219. if (fpos_cmp(ctx->pos, di->offset) <= 0) {
  220. __ceph_dentry_dir_lease_touch(di);
  221. emit_dentry = true;
  222. }
  223. spin_unlock(&dentry->d_lock);
  224. if (emit_dentry) {
  225. dout(" %llx dentry %p %pd %p\n", di->offset,
  226. dentry, dentry, d_inode(dentry));
  227. ctx->pos = di->offset;
  228. if (!dir_emit(ctx, dentry->d_name.name,
  229. dentry->d_name.len, ceph_present_inode(d_inode(dentry)),
  230. d_inode(dentry)->i_mode >> 12)) {
  231. dput(dentry);
  232. err = 0;
  233. break;
  234. }
  235. ctx->pos++;
  236. if (last)
  237. dput(last);
  238. last = dentry;
  239. } else {
  240. dput(dentry);
  241. }
  242. }
  243. out:
  244. ceph_readdir_cache_release(&cache_ctl);
  245. if (last) {
  246. int ret;
  247. di = ceph_dentry(last);
  248. ret = note_last_dentry(dfi, last->d_name.name, last->d_name.len,
  249. fpos_off(di->offset) + 1);
  250. if (ret < 0)
  251. err = ret;
  252. dput(last);
  253. /* last_name no longer match cache index */
  254. if (dfi->readdir_cache_idx >= 0) {
  255. dfi->readdir_cache_idx = -1;
  256. dfi->dir_release_count = 0;
  257. }
  258. }
  259. return err;
  260. }
  261. static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos)
  262. {
  263. if (!dfi->last_readdir)
  264. return true;
  265. if (is_hash_order(pos))
  266. return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos));
  267. else
  268. return dfi->frag != fpos_frag(pos);
  269. }
  270. static int ceph_readdir(struct file *file, struct dir_context *ctx)
  271. {
  272. struct ceph_dir_file_info *dfi = file->private_data;
  273. struct inode *inode = file_inode(file);
  274. struct ceph_inode_info *ci = ceph_inode(inode);
  275. struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
  276. struct ceph_mds_client *mdsc = fsc->mdsc;
  277. int i;
  278. int err;
  279. unsigned frag = -1;
  280. struct ceph_mds_reply_info_parsed *rinfo;
  281. dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos);
  282. if (dfi->file_info.flags & CEPH_F_ATEND)
  283. return 0;
  284. /* always start with . and .. */
  285. if (ctx->pos == 0) {
  286. dout("readdir off 0 -> '.'\n");
  287. if (!dir_emit(ctx, ".", 1, ceph_present_inode(inode),
  288. inode->i_mode >> 12))
  289. return 0;
  290. ctx->pos = 1;
  291. }
  292. if (ctx->pos == 1) {
  293. u64 ino;
  294. struct dentry *dentry = file->f_path.dentry;
  295. spin_lock(&dentry->d_lock);
  296. ino = ceph_present_inode(dentry->d_parent->d_inode);
  297. spin_unlock(&dentry->d_lock);
  298. dout("readdir off 1 -> '..'\n");
  299. if (!dir_emit(ctx, "..", 2, ino, inode->i_mode >> 12))
  300. return 0;
  301. ctx->pos = 2;
  302. }
  303. spin_lock(&ci->i_ceph_lock);
  304. /* request Fx cap. if have Fx, we don't need to release Fs cap
  305. * for later create/unlink. */
  306. __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_WR);
  307. /* can we use the dcache? */
  308. if (ceph_test_mount_opt(fsc, DCACHE) &&
  309. !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
  310. ceph_snap(inode) != CEPH_SNAPDIR &&
  311. __ceph_dir_is_complete_ordered(ci) &&
  312. __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {
  313. int shared_gen = atomic_read(&ci->i_shared_gen);
  314. spin_unlock(&ci->i_ceph_lock);
  315. err = __dcache_readdir(file, ctx, shared_gen);
  316. if (err != -EAGAIN)
  317. return err;
  318. } else {
  319. spin_unlock(&ci->i_ceph_lock);
  320. }
  321. /* proceed with a normal readdir */
  322. more:
  323. /* do we have the correct frag content buffered? */
  324. if (need_send_readdir(dfi, ctx->pos)) {
  325. struct ceph_mds_request *req;
  326. int op = ceph_snap(inode) == CEPH_SNAPDIR ?
  327. CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
  328. /* discard old result, if any */
  329. if (dfi->last_readdir) {
  330. ceph_mdsc_put_request(dfi->last_readdir);
  331. dfi->last_readdir = NULL;
  332. }
  333. if (is_hash_order(ctx->pos)) {
  334. /* fragtree isn't always accurate. choose frag
  335. * based on previous reply when possible. */
  336. if (frag == (unsigned)-1)
  337. frag = ceph_choose_frag(ci, fpos_hash(ctx->pos),
  338. NULL, NULL);
  339. } else {
  340. frag = fpos_frag(ctx->pos);
  341. }
  342. dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
  343. ceph_vinop(inode), frag, dfi->last_name);
  344. req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
  345. if (IS_ERR(req))
  346. return PTR_ERR(req);
  347. err = ceph_alloc_readdir_reply_buffer(req, inode);
  348. if (err) {
  349. ceph_mdsc_put_request(req);
  350. return err;
  351. }
  352. /* hints to request -> mds selection code */
  353. req->r_direct_mode = USE_AUTH_MDS;
  354. if (op == CEPH_MDS_OP_READDIR) {
  355. req->r_direct_hash = ceph_frag_value(frag);
  356. __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
  357. req->r_inode_drop = CEPH_CAP_FILE_EXCL;
  358. }
  359. if (dfi->last_name) {
  360. req->r_path2 = kstrdup(dfi->last_name, GFP_KERNEL);
  361. if (!req->r_path2) {
  362. ceph_mdsc_put_request(req);
  363. return -ENOMEM;
  364. }
  365. } else if (is_hash_order(ctx->pos)) {
  366. req->r_args.readdir.offset_hash =
  367. cpu_to_le32(fpos_hash(ctx->pos));
  368. }
  369. req->r_dir_release_cnt = dfi->dir_release_count;
  370. req->r_dir_ordered_cnt = dfi->dir_ordered_count;
  371. req->r_readdir_cache_idx = dfi->readdir_cache_idx;
  372. req->r_readdir_offset = dfi->next_offset;
  373. req->r_args.readdir.frag = cpu_to_le32(frag);
  374. req->r_args.readdir.flags =
  375. cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
  376. req->r_inode = inode;
  377. ihold(inode);
  378. req->r_dentry = dget(file->f_path.dentry);
  379. err = ceph_mdsc_do_request(mdsc, NULL, req);
  380. if (err < 0) {
  381. ceph_mdsc_put_request(req);
  382. return err;
  383. }
  384. dout("readdir got and parsed readdir result=%d on "
  385. "frag %x, end=%d, complete=%d, hash_order=%d\n",
  386. err, frag,
  387. (int)req->r_reply_info.dir_end,
  388. (int)req->r_reply_info.dir_complete,
  389. (int)req->r_reply_info.hash_order);
  390. rinfo = &req->r_reply_info;
  391. if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
  392. frag = le32_to_cpu(rinfo->dir_dir->frag);
  393. if (!rinfo->hash_order) {
  394. dfi->next_offset = req->r_readdir_offset;
  395. /* adjust ctx->pos to beginning of frag */
  396. ctx->pos = ceph_make_fpos(frag,
  397. dfi->next_offset,
  398. false);
  399. }
  400. }
  401. dfi->frag = frag;
  402. dfi->last_readdir = req;
  403. if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) {
  404. dfi->readdir_cache_idx = req->r_readdir_cache_idx;
  405. if (dfi->readdir_cache_idx < 0) {
  406. /* preclude from marking dir ordered */
  407. dfi->dir_ordered_count = 0;
  408. } else if (ceph_frag_is_leftmost(frag) &&
  409. dfi->next_offset == 2) {
  410. /* note dir version at start of readdir so
  411. * we can tell if any dentries get dropped */
  412. dfi->dir_release_count = req->r_dir_release_cnt;
  413. dfi->dir_ordered_count = req->r_dir_ordered_cnt;
  414. }
  415. } else {
  416. dout("readdir !did_prepopulate\n");
  417. /* disable readdir cache */
  418. dfi->readdir_cache_idx = -1;
  419. /* preclude from marking dir complete */
  420. dfi->dir_release_count = 0;
  421. }
  422. /* note next offset and last dentry name */
  423. if (rinfo->dir_nr > 0) {
  424. struct ceph_mds_reply_dir_entry *rde =
  425. rinfo->dir_entries + (rinfo->dir_nr-1);
  426. unsigned next_offset = req->r_reply_info.dir_end ?
  427. 2 : (fpos_off(rde->offset) + 1);
  428. err = note_last_dentry(dfi, rde->name, rde->name_len,
  429. next_offset);
  430. if (err) {
  431. ceph_mdsc_put_request(dfi->last_readdir);
  432. dfi->last_readdir = NULL;
  433. return err;
  434. }
  435. } else if (req->r_reply_info.dir_end) {
  436. dfi->next_offset = 2;
  437. /* keep last name */
  438. }
  439. }
  440. rinfo = &dfi->last_readdir->r_reply_info;
  441. dout("readdir frag %x num %d pos %llx chunk first %llx\n",
  442. dfi->frag, rinfo->dir_nr, ctx->pos,
  443. rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL);
  444. i = 0;
  445. /* search start position */
  446. if (rinfo->dir_nr > 0) {
  447. int step, nr = rinfo->dir_nr;
  448. while (nr > 0) {
  449. step = nr >> 1;
  450. if (rinfo->dir_entries[i + step].offset < ctx->pos) {
  451. i += step + 1;
  452. nr -= step + 1;
  453. } else {
  454. nr = step;
  455. }
  456. }
  457. }
  458. for (; i < rinfo->dir_nr; i++) {
  459. struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
  460. BUG_ON(rde->offset < ctx->pos);
  461. ctx->pos = rde->offset;
  462. dout("readdir (%d/%d) -> %llx '%.*s' %p\n",
  463. i, rinfo->dir_nr, ctx->pos,
  464. rde->name_len, rde->name, &rde->inode.in);
  465. BUG_ON(!rde->inode.in);
  466. if (!dir_emit(ctx, rde->name, rde->name_len,
  467. ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)),
  468. le32_to_cpu(rde->inode.in->mode) >> 12)) {
  469. /*
  470. * NOTE: Here no need to put the 'dfi->last_readdir',
  471. * because when dir_emit stops us it's most likely
  472. * doesn't have enough memory, etc. So for next readdir
  473. * it will continue.
  474. */
  475. dout("filldir stopping us...\n");
  476. return 0;
  477. }
  478. ctx->pos++;
  479. }
  480. ceph_mdsc_put_request(dfi->last_readdir);
  481. dfi->last_readdir = NULL;
  482. if (dfi->next_offset > 2) {
  483. frag = dfi->frag;
  484. goto more;
  485. }
  486. /* more frags? */
  487. if (!ceph_frag_is_rightmost(dfi->frag)) {
  488. frag = ceph_frag_next(dfi->frag);
  489. if (is_hash_order(ctx->pos)) {
  490. loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag),
  491. dfi->next_offset, true);
  492. if (new_pos > ctx->pos)
  493. ctx->pos = new_pos;
  494. /* keep last_name */
  495. } else {
  496. ctx->pos = ceph_make_fpos(frag, dfi->next_offset,
  497. false);
  498. kfree(dfi->last_name);
  499. dfi->last_name = NULL;
  500. }
  501. dout("readdir next frag is %x\n", frag);
  502. goto more;
  503. }
  504. dfi->file_info.flags |= CEPH_F_ATEND;
  505. /*
  506. * if dir_release_count still matches the dir, no dentries
  507. * were released during the whole readdir, and we should have
  508. * the complete dir contents in our cache.
  509. */
  510. if (atomic64_read(&ci->i_release_count) ==
  511. dfi->dir_release_count) {
  512. spin_lock(&ci->i_ceph_lock);
  513. if (dfi->dir_ordered_count ==
  514. atomic64_read(&ci->i_ordered_count)) {
  515. dout(" marking %p complete and ordered\n", inode);
  516. /* use i_size to track number of entries in
  517. * readdir cache */
  518. BUG_ON(dfi->readdir_cache_idx < 0);
  519. i_size_write(inode, dfi->readdir_cache_idx *
  520. sizeof(struct dentry*));
  521. } else {
  522. dout(" marking %p complete\n", inode);
  523. }
  524. __ceph_dir_set_complete(ci, dfi->dir_release_count,
  525. dfi->dir_ordered_count);
  526. spin_unlock(&ci->i_ceph_lock);
  527. }
  528. dout("readdir %p file %p done.\n", inode, file);
  529. return 0;
  530. }
  531. static void reset_readdir(struct ceph_dir_file_info *dfi)
  532. {
  533. if (dfi->last_readdir) {
  534. ceph_mdsc_put_request(dfi->last_readdir);
  535. dfi->last_readdir = NULL;
  536. }
  537. kfree(dfi->last_name);
  538. dfi->last_name = NULL;
  539. dfi->dir_release_count = 0;
  540. dfi->readdir_cache_idx = -1;
  541. dfi->next_offset = 2; /* compensate for . and .. */
  542. dfi->file_info.flags &= ~CEPH_F_ATEND;
  543. }
  544. /*
  545. * discard buffered readdir content on seekdir(0), or seek to new frag,
  546. * or seek prior to current chunk
  547. */
  548. static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos)
  549. {
  550. struct ceph_mds_reply_info_parsed *rinfo;
  551. loff_t chunk_offset;
  552. if (new_pos == 0)
  553. return true;
  554. if (is_hash_order(new_pos)) {
  555. /* no need to reset last_name for a forward seek when
  556. * dentries are sotred in hash order */
  557. } else if (dfi->frag != fpos_frag(new_pos)) {
  558. return true;
  559. }
  560. rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL;
  561. if (!rinfo || !rinfo->dir_nr)
  562. return true;
  563. chunk_offset = rinfo->dir_entries[0].offset;
  564. return new_pos < chunk_offset ||
  565. is_hash_order(new_pos) != is_hash_order(chunk_offset);
  566. }
  567. static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
  568. {
  569. struct ceph_dir_file_info *dfi = file->private_data;
  570. struct inode *inode = file->f_mapping->host;
  571. loff_t retval;
  572. inode_lock(inode);
  573. retval = -EINVAL;
  574. switch (whence) {
  575. case SEEK_CUR:
  576. offset += file->f_pos;
  577. break;
  578. case SEEK_SET:
  579. break;
  580. case SEEK_END:
  581. retval = -EOPNOTSUPP;
  582. goto out;
  583. default:
  584. goto out;
  585. }
  586. if (offset >= 0) {
  587. if (need_reset_readdir(dfi, offset)) {
  588. dout("dir_llseek dropping %p content\n", file);
  589. reset_readdir(dfi);
  590. } else if (is_hash_order(offset) && offset > file->f_pos) {
  591. /* for hash offset, we don't know if a forward seek
  592. * is within same frag */
  593. dfi->dir_release_count = 0;
  594. dfi->readdir_cache_idx = -1;
  595. }
  596. if (offset != file->f_pos) {
  597. file->f_pos = offset;
  598. file->f_version = 0;
  599. dfi->file_info.flags &= ~CEPH_F_ATEND;
  600. }
  601. retval = offset;
  602. }
  603. out:
  604. inode_unlock(inode);
  605. return retval;
  606. }
  607. /*
  608. * Handle lookups for the hidden .snap directory.
  609. */
  610. struct dentry *ceph_handle_snapdir(struct ceph_mds_request *req,
  611. struct dentry *dentry)
  612. {
  613. struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
  614. struct inode *parent = d_inode(dentry->d_parent); /* we hold i_rwsem */
  615. /* .snap dir? */
  616. if (ceph_snap(parent) == CEPH_NOSNAP &&
  617. strcmp(dentry->d_name.name, fsc->mount_options->snapdir_name) == 0) {
  618. struct dentry *res;
  619. struct inode *inode = ceph_get_snapdir(parent);
  620. res = d_splice_alias(inode, dentry);
  621. dout("ENOENT on snapdir %p '%pd', linking to snapdir %p. Spliced dentry %p\n",
  622. dentry, dentry, inode, res);
  623. if (res)
  624. dentry = res;
  625. }
  626. return dentry;
  627. }
  628. /*
  629. * Figure out final result of a lookup/open request.
  630. *
  631. * Mainly, make sure we return the final req->r_dentry (if it already
  632. * existed) in place of the original VFS-provided dentry when they
  633. * differ.
  634. *
  635. * Gracefully handle the case where the MDS replies with -ENOENT and
  636. * no trace (which it may do, at its discretion, e.g., if it doesn't
  637. * care to issue a lease on the negative dentry).
  638. */
  639. struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
  640. struct dentry *dentry, int err)
  641. {
  642. if (err == -ENOENT) {
  643. /* no trace? */
  644. err = 0;
  645. if (!req->r_reply_info.head->is_dentry) {
  646. dout("ENOENT and no trace, dentry %p inode %p\n",
  647. dentry, d_inode(dentry));
  648. if (d_really_is_positive(dentry)) {
  649. d_drop(dentry);
  650. err = -ENOENT;
  651. } else {
  652. d_add(dentry, NULL);
  653. }
  654. }
  655. }
  656. if (err)
  657. dentry = ERR_PTR(err);
  658. else if (dentry != req->r_dentry)
  659. dentry = dget(req->r_dentry); /* we got spliced */
  660. else
  661. dentry = NULL;
  662. return dentry;
  663. }
  664. static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
  665. {
  666. return ceph_ino(inode) == CEPH_INO_ROOT &&
  667. strncmp(dentry->d_name.name, ".ceph", 5) == 0;
  668. }
  669. /*
  670. * Look up a single dir entry. If there is a lookup intent, inform
  671. * the MDS so that it gets our 'caps wanted' value in a single op.
  672. */
  673. static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
  674. unsigned int flags)
  675. {
  676. struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
  677. struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
  678. struct ceph_mds_request *req;
  679. int op;
  680. int mask;
  681. int err;
  682. dout("lookup %p dentry %p '%pd'\n",
  683. dir, dentry, dentry);
  684. if (dentry->d_name.len > NAME_MAX)
  685. return ERR_PTR(-ENAMETOOLONG);
  686. /* can we conclude ENOENT locally? */
  687. if (d_really_is_negative(dentry)) {
  688. struct ceph_inode_info *ci = ceph_inode(dir);
  689. struct ceph_dentry_info *di = ceph_dentry(dentry);
  690. spin_lock(&ci->i_ceph_lock);
  691. dout(" dir %p flags are 0x%lx\n", dir, ci->i_ceph_flags);
  692. if (strncmp(dentry->d_name.name,
  693. fsc->mount_options->snapdir_name,
  694. dentry->d_name.len) &&
  695. !is_root_ceph_dentry(dir, dentry) &&
  696. ceph_test_mount_opt(fsc, DCACHE) &&
  697. __ceph_dir_is_complete(ci) &&
  698. __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {
  699. __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);
  700. spin_unlock(&ci->i_ceph_lock);
  701. dout(" dir %p complete, -ENOENT\n", dir);
  702. d_add(dentry, NULL);
  703. di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
  704. return NULL;
  705. }
  706. spin_unlock(&ci->i_ceph_lock);
  707. }
  708. op = ceph_snap(dir) == CEPH_SNAPDIR ?
  709. CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
  710. req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
  711. if (IS_ERR(req))
  712. return ERR_CAST(req);
  713. req->r_dentry = dget(dentry);
  714. req->r_num_caps = 2;
  715. mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
  716. if (ceph_security_xattr_wanted(dir))
  717. mask |= CEPH_CAP_XATTR_SHARED;
  718. req->r_args.getattr.mask = cpu_to_le32(mask);
  719. ihold(dir);
  720. req->r_parent = dir;
  721. set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
  722. err = ceph_mdsc_do_request(mdsc, NULL, req);
  723. if (err == -ENOENT) {
  724. struct dentry *res;
  725. res = ceph_handle_snapdir(req, dentry);
  726. if (IS_ERR(res)) {
  727. err = PTR_ERR(res);
  728. } else {
  729. dentry = res;
  730. err = 0;
  731. }
  732. }
  733. dentry = ceph_finish_lookup(req, dentry, err);
  734. ceph_mdsc_put_request(req); /* will dput(dentry) */
  735. dout("lookup result=%p\n", dentry);
  736. return dentry;
  737. }
  738. /*
  739. * If we do a create but get no trace back from the MDS, follow up with
  740. * a lookup (the VFS expects us to link up the provided dentry).
  741. */
  742. int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
  743. {
  744. struct dentry *result = ceph_lookup(dir, dentry, 0);
  745. if (result && !IS_ERR(result)) {
  746. /*
  747. * We created the item, then did a lookup, and found
  748. * it was already linked to another inode we already
  749. * had in our cache (and thus got spliced). To not
  750. * confuse VFS (especially when inode is a directory),
  751. * we don't link our dentry to that inode, return an
  752. * error instead.
  753. *
  754. * This event should be rare and it happens only when
  755. * we talk to old MDS. Recent MDS does not send traceless
  756. * reply for request that creates new inode.
  757. */
  758. d_drop(result);
  759. return -ESTALE;
  760. }
  761. return PTR_ERR(result);
  762. }
  763. static int ceph_mknod(struct user_namespace *mnt_userns, struct inode *dir,
  764. struct dentry *dentry, umode_t mode, dev_t rdev)
  765. {
  766. struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
  767. struct ceph_mds_request *req;
  768. struct ceph_acl_sec_ctx as_ctx = {};
  769. int err;
  770. if (ceph_snap(dir) != CEPH_NOSNAP)
  771. return -EROFS;
  772. err = ceph_wait_on_conflict_unlink(dentry);
  773. if (err)
  774. return err;
  775. if (ceph_quota_is_max_files_exceeded(dir)) {
  776. err = -EDQUOT;
  777. goto out;
  778. }
  779. err = ceph_pre_init_acls(dir, &mode, &as_ctx);
  780. if (err < 0)
  781. goto out;
  782. err = ceph_security_init_secctx(dentry, mode, &as_ctx);
  783. if (err < 0)
  784. goto out;
  785. dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
  786. dir, dentry, mode, rdev);
  787. req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
  788. if (IS_ERR(req)) {
  789. err = PTR_ERR(req);
  790. goto out;
  791. }
  792. req->r_dentry = dget(dentry);
  793. req->r_num_caps = 2;
  794. req->r_parent = dir;
  795. ihold(dir);
  796. set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
  797. req->r_args.mknod.mode = cpu_to_le32(mode);
  798. req->r_args.mknod.rdev = cpu_to_le32(rdev);
  799. req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
  800. req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
  801. if (as_ctx.pagelist) {
  802. req->r_pagelist = as_ctx.pagelist;
  803. as_ctx.pagelist = NULL;
  804. }
  805. err = ceph_mdsc_do_request(mdsc, dir, req);
  806. if (!err && !req->r_reply_info.head->is_dentry)
  807. err = ceph_handle_notrace_create(dir, dentry);
  808. ceph_mdsc_put_request(req);
  809. out:
  810. if (!err)
  811. ceph_init_inode_acls(d_inode(dentry), &as_ctx);
  812. else
  813. d_drop(dentry);
  814. ceph_release_acl_sec_ctx(&as_ctx);
  815. return err;
  816. }
  817. static int ceph_create(struct user_namespace *mnt_userns, struct inode *dir,
  818. struct dentry *dentry, umode_t mode, bool excl)
  819. {
  820. return ceph_mknod(mnt_userns, dir, dentry, mode, 0);
  821. }
  822. static int ceph_symlink(struct user_namespace *mnt_userns, struct inode *dir,
  823. struct dentry *dentry, const char *dest)
  824. {
  825. struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
  826. struct ceph_mds_request *req;
  827. struct ceph_acl_sec_ctx as_ctx = {};
  828. int err;
  829. if (ceph_snap(dir) != CEPH_NOSNAP)
  830. return -EROFS;
  831. err = ceph_wait_on_conflict_unlink(dentry);
  832. if (err)
  833. return err;
  834. if (ceph_quota_is_max_files_exceeded(dir)) {
  835. err = -EDQUOT;
  836. goto out;
  837. }
  838. err = ceph_security_init_secctx(dentry, S_IFLNK | 0777, &as_ctx);
  839. if (err < 0)
  840. goto out;
  841. dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
  842. req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
  843. if (IS_ERR(req)) {
  844. err = PTR_ERR(req);
  845. goto out;
  846. }
  847. req->r_path2 = kstrdup(dest, GFP_KERNEL);
  848. if (!req->r_path2) {
  849. err = -ENOMEM;
  850. ceph_mdsc_put_request(req);
  851. goto out;
  852. }
  853. req->r_parent = dir;
  854. ihold(dir);
  855. set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
  856. req->r_dentry = dget(dentry);
  857. req->r_num_caps = 2;
  858. req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
  859. req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
  860. if (as_ctx.pagelist) {
  861. req->r_pagelist = as_ctx.pagelist;
  862. as_ctx.pagelist = NULL;
  863. }
  864. err = ceph_mdsc_do_request(mdsc, dir, req);
  865. if (!err && !req->r_reply_info.head->is_dentry)
  866. err = ceph_handle_notrace_create(dir, dentry);
  867. ceph_mdsc_put_request(req);
  868. out:
  869. if (err)
  870. d_drop(dentry);
  871. ceph_release_acl_sec_ctx(&as_ctx);
  872. return err;
  873. }
  874. static int ceph_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
  875. struct dentry *dentry, umode_t mode)
  876. {
  877. struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
  878. struct ceph_mds_request *req;
  879. struct ceph_acl_sec_ctx as_ctx = {};
  880. int err;
  881. int op;
  882. err = ceph_wait_on_conflict_unlink(dentry);
  883. if (err)
  884. return err;
  885. if (ceph_snap(dir) == CEPH_SNAPDIR) {
  886. /* mkdir .snap/foo is a MKSNAP */
  887. op = CEPH_MDS_OP_MKSNAP;
  888. dout("mksnap dir %p snap '%pd' dn %p\n", dir,
  889. dentry, dentry);
  890. } else if (ceph_snap(dir) == CEPH_NOSNAP) {
  891. dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
  892. op = CEPH_MDS_OP_MKDIR;
  893. } else {
  894. err = -EROFS;
  895. goto out;
  896. }
  897. if (op == CEPH_MDS_OP_MKDIR &&
  898. ceph_quota_is_max_files_exceeded(dir)) {
  899. err = -EDQUOT;
  900. goto out;
  901. }
  902. mode |= S_IFDIR;
  903. err = ceph_pre_init_acls(dir, &mode, &as_ctx);
  904. if (err < 0)
  905. goto out;
  906. err = ceph_security_init_secctx(dentry, mode, &as_ctx);
  907. if (err < 0)
  908. goto out;
  909. req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
  910. if (IS_ERR(req)) {
  911. err = PTR_ERR(req);
  912. goto out;
  913. }
  914. req->r_dentry = dget(dentry);
  915. req->r_num_caps = 2;
  916. req->r_parent = dir;
  917. ihold(dir);
  918. set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
  919. req->r_args.mkdir.mode = cpu_to_le32(mode);
  920. req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
  921. req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
  922. if (as_ctx.pagelist) {
  923. req->r_pagelist = as_ctx.pagelist;
  924. as_ctx.pagelist = NULL;
  925. }
  926. err = ceph_mdsc_do_request(mdsc, dir, req);
  927. if (!err &&
  928. !req->r_reply_info.head->is_target &&
  929. !req->r_reply_info.head->is_dentry)
  930. err = ceph_handle_notrace_create(dir, dentry);
  931. ceph_mdsc_put_request(req);
  932. out:
  933. if (!err)
  934. ceph_init_inode_acls(d_inode(dentry), &as_ctx);
  935. else
  936. d_drop(dentry);
  937. ceph_release_acl_sec_ctx(&as_ctx);
  938. return err;
  939. }
  940. static int ceph_link(struct dentry *old_dentry, struct inode *dir,
  941. struct dentry *dentry)
  942. {
  943. struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
  944. struct ceph_mds_request *req;
  945. int err;
  946. err = ceph_wait_on_conflict_unlink(dentry);
  947. if (err)
  948. return err;
  949. if (ceph_snap(dir) != CEPH_NOSNAP)
  950. return -EROFS;
  951. dout("link in dir %p old_dentry %p dentry %p\n", dir,
  952. old_dentry, dentry);
  953. req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
  954. if (IS_ERR(req)) {
  955. d_drop(dentry);
  956. return PTR_ERR(req);
  957. }
  958. req->r_dentry = dget(dentry);
  959. req->r_num_caps = 2;
  960. req->r_old_dentry = dget(old_dentry);
  961. req->r_parent = dir;
  962. ihold(dir);
  963. set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
  964. req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
  965. req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
  966. /* release LINK_SHARED on source inode (mds will lock it) */
  967. req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
  968. err = ceph_mdsc_do_request(mdsc, dir, req);
  969. if (err) {
  970. d_drop(dentry);
  971. } else if (!req->r_reply_info.head->is_dentry) {
  972. ihold(d_inode(old_dentry));
  973. d_instantiate(dentry, d_inode(old_dentry));
  974. }
  975. ceph_mdsc_put_request(req);
  976. return err;
  977. }
  978. static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc,
  979. struct ceph_mds_request *req)
  980. {
  981. struct dentry *dentry = req->r_dentry;
  982. struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
  983. struct ceph_dentry_info *di = ceph_dentry(dentry);
  984. int result = req->r_err ? req->r_err :
  985. le32_to_cpu(req->r_reply_info.head->result);
  986. if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags))
  987. pr_warn("%s dentry %p:%pd async unlink bit is not set\n",
  988. __func__, dentry, dentry);
  989. spin_lock(&fsc->async_unlink_conflict_lock);
  990. hash_del_rcu(&di->hnode);
  991. spin_unlock(&fsc->async_unlink_conflict_lock);
  992. spin_lock(&dentry->d_lock);
  993. di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK;
  994. wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT);
  995. spin_unlock(&dentry->d_lock);
  996. synchronize_rcu();
  997. if (result == -EJUKEBOX)
  998. goto out;
  999. /* If op failed, mark everyone involved for errors */
  1000. if (result) {
  1001. int pathlen = 0;
  1002. u64 base = 0;
  1003. char *path = ceph_mdsc_build_path(dentry, &pathlen,
  1004. &base, 0);
  1005. /* mark error on parent + clear complete */
  1006. mapping_set_error(req->r_parent->i_mapping, result);
  1007. ceph_dir_clear_complete(req->r_parent);
  1008. /* drop the dentry -- we don't know its status */
  1009. if (!d_unhashed(dentry))
  1010. d_drop(dentry);
  1011. /* mark inode itself for an error (since metadata is bogus) */
  1012. mapping_set_error(req->r_old_inode->i_mapping, result);
  1013. pr_warn("async unlink failure path=(%llx)%s result=%d!\n",
  1014. base, IS_ERR(path) ? "<<bad>>" : path, result);
  1015. ceph_mdsc_free_path(path, pathlen);
  1016. }
  1017. out:
  1018. iput(req->r_old_inode);
  1019. ceph_mdsc_release_dir_caps(req);
  1020. }
  1021. static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry)
  1022. {
  1023. struct ceph_inode_info *ci = ceph_inode(dir);
  1024. struct ceph_dentry_info *di;
  1025. int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK;
  1026. spin_lock(&ci->i_ceph_lock);
  1027. if ((__ceph_caps_issued(ci, NULL) & want) == want) {
  1028. ceph_take_cap_refs(ci, want, false);
  1029. got = want;
  1030. }
  1031. spin_unlock(&ci->i_ceph_lock);
  1032. /* If we didn't get anything, return 0 */
  1033. if (!got)
  1034. return 0;
  1035. spin_lock(&dentry->d_lock);
  1036. di = ceph_dentry(dentry);
  1037. /*
  1038. * - We are holding Fx, which implies Fs caps.
  1039. * - Only support async unlink for primary linkage
  1040. */
  1041. if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen ||
  1042. !(di->flags & CEPH_DENTRY_PRIMARY_LINK))
  1043. want = 0;
  1044. spin_unlock(&dentry->d_lock);
  1045. /* Do we still want what we've got? */
  1046. if (want == got)
  1047. return got;
  1048. ceph_put_cap_refs(ci, got);
  1049. return 0;
  1050. }
  1051. /*
  1052. * rmdir and unlink are differ only by the metadata op code
  1053. */
  1054. static int ceph_unlink(struct inode *dir, struct dentry *dentry)
  1055. {
  1056. struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
  1057. struct ceph_mds_client *mdsc = fsc->mdsc;
  1058. struct inode *inode = d_inode(dentry);
  1059. struct ceph_mds_request *req;
  1060. bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
  1061. int err = -EROFS;
  1062. int op;
  1063. if (ceph_snap(dir) == CEPH_SNAPDIR) {
  1064. /* rmdir .snap/foo is RMSNAP */
  1065. dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
  1066. op = CEPH_MDS_OP_RMSNAP;
  1067. } else if (ceph_snap(dir) == CEPH_NOSNAP) {
  1068. dout("unlink/rmdir dir %p dn %p inode %p\n",
  1069. dir, dentry, inode);
  1070. op = d_is_dir(dentry) ?
  1071. CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
  1072. } else
  1073. goto out;
  1074. retry:
  1075. req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
  1076. if (IS_ERR(req)) {
  1077. err = PTR_ERR(req);
  1078. goto out;
  1079. }
  1080. req->r_dentry = dget(dentry);
  1081. req->r_num_caps = 2;
  1082. req->r_parent = dir;
  1083. ihold(dir);
  1084. req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
  1085. req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
  1086. req->r_inode_drop = ceph_drop_caps_for_unlink(inode);
  1087. if (try_async && op == CEPH_MDS_OP_UNLINK &&
  1088. (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) {
  1089. struct ceph_dentry_info *di = ceph_dentry(dentry);
  1090. dout("async unlink on %llu/%.*s caps=%s", ceph_ino(dir),
  1091. dentry->d_name.len, dentry->d_name.name,
  1092. ceph_cap_string(req->r_dir_caps));
  1093. set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
  1094. req->r_callback = ceph_async_unlink_cb;
  1095. req->r_old_inode = d_inode(dentry);
  1096. ihold(req->r_old_inode);
  1097. spin_lock(&dentry->d_lock);
  1098. di->flags |= CEPH_DENTRY_ASYNC_UNLINK;
  1099. spin_unlock(&dentry->d_lock);
  1100. spin_lock(&fsc->async_unlink_conflict_lock);
  1101. hash_add_rcu(fsc->async_unlink_conflict, &di->hnode,
  1102. dentry->d_name.hash);
  1103. spin_unlock(&fsc->async_unlink_conflict_lock);
  1104. err = ceph_mdsc_submit_request(mdsc, dir, req);
  1105. if (!err) {
  1106. /*
  1107. * We have enough caps, so we assume that the unlink
  1108. * will succeed. Fix up the target inode and dcache.
  1109. */
  1110. drop_nlink(inode);
  1111. d_delete(dentry);
  1112. } else {
  1113. spin_lock(&fsc->async_unlink_conflict_lock);
  1114. hash_del_rcu(&di->hnode);
  1115. spin_unlock(&fsc->async_unlink_conflict_lock);
  1116. spin_lock(&dentry->d_lock);
  1117. di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK;
  1118. spin_unlock(&dentry->d_lock);
  1119. if (err == -EJUKEBOX) {
  1120. try_async = false;
  1121. ceph_mdsc_put_request(req);
  1122. goto retry;
  1123. }
  1124. }
  1125. } else {
  1126. set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
  1127. err = ceph_mdsc_do_request(mdsc, dir, req);
  1128. if (!err && !req->r_reply_info.head->is_dentry)
  1129. d_delete(dentry);
  1130. }
  1131. ceph_mdsc_put_request(req);
  1132. out:
  1133. return err;
  1134. }
  1135. static int ceph_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
  1136. struct dentry *old_dentry, struct inode *new_dir,
  1137. struct dentry *new_dentry, unsigned int flags)
  1138. {
  1139. struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(old_dir->i_sb);
  1140. struct ceph_mds_request *req;
  1141. int op = CEPH_MDS_OP_RENAME;
  1142. int err;
  1143. if (flags)
  1144. return -EINVAL;
  1145. if (ceph_snap(old_dir) != ceph_snap(new_dir))
  1146. return -EXDEV;
  1147. if (ceph_snap(old_dir) != CEPH_NOSNAP) {
  1148. if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
  1149. op = CEPH_MDS_OP_RENAMESNAP;
  1150. else
  1151. return -EROFS;
  1152. }
  1153. /* don't allow cross-quota renames */
  1154. if ((old_dir != new_dir) &&
  1155. (!ceph_quota_is_same_realm(old_dir, new_dir)))
  1156. return -EXDEV;
  1157. err = ceph_wait_on_conflict_unlink(new_dentry);
  1158. if (err)
  1159. return err;
  1160. dout("rename dir %p dentry %p to dir %p dentry %p\n",
  1161. old_dir, old_dentry, new_dir, new_dentry);
  1162. req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
  1163. if (IS_ERR(req))
  1164. return PTR_ERR(req);
  1165. ihold(old_dir);
  1166. req->r_dentry = dget(new_dentry);
  1167. req->r_num_caps = 2;
  1168. req->r_old_dentry = dget(old_dentry);
  1169. req->r_old_dentry_dir = old_dir;
  1170. req->r_parent = new_dir;
  1171. ihold(new_dir);
  1172. set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
  1173. req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
  1174. req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
  1175. req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
  1176. req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
  1177. /* release LINK_RDCACHE on source inode (mds will lock it) */
  1178. req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
  1179. if (d_really_is_positive(new_dentry)) {
  1180. req->r_inode_drop =
  1181. ceph_drop_caps_for_unlink(d_inode(new_dentry));
  1182. }
  1183. err = ceph_mdsc_do_request(mdsc, old_dir, req);
  1184. if (!err && !req->r_reply_info.head->is_dentry) {
  1185. /*
  1186. * Normally d_move() is done by fill_trace (called by
  1187. * do_request, above). If there is no trace, we need
  1188. * to do it here.
  1189. */
  1190. d_move(old_dentry, new_dentry);
  1191. }
  1192. ceph_mdsc_put_request(req);
  1193. return err;
  1194. }
  1195. /*
  1196. * Move dentry to tail of mdsc->dentry_leases list when lease is updated.
  1197. * Leases at front of the list will expire first. (Assume all leases have
  1198. * similar duration)
  1199. *
  1200. * Called under dentry->d_lock.
  1201. */
  1202. void __ceph_dentry_lease_touch(struct ceph_dentry_info *di)
  1203. {
  1204. struct dentry *dn = di->dentry;
  1205. struct ceph_mds_client *mdsc;
  1206. dout("dentry_lease_touch %p %p '%pd'\n", di, dn, dn);
  1207. di->flags |= CEPH_DENTRY_LEASE_LIST;
  1208. if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
  1209. di->flags |= CEPH_DENTRY_REFERENCED;
  1210. return;
  1211. }
  1212. mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
  1213. spin_lock(&mdsc->dentry_list_lock);
  1214. list_move_tail(&di->lease_list, &mdsc->dentry_leases);
  1215. spin_unlock(&mdsc->dentry_list_lock);
  1216. }
  1217. static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc,
  1218. struct ceph_dentry_info *di)
  1219. {
  1220. di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED);
  1221. di->lease_gen = 0;
  1222. di->time = jiffies;
  1223. list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases);
  1224. }
  1225. /*
  1226. * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases
  1227. * list if it's not in the list, otherwise set 'referenced' flag.
  1228. *
  1229. * Called under dentry->d_lock.
  1230. */
  1231. void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di)
  1232. {
  1233. struct dentry *dn = di->dentry;
  1234. struct ceph_mds_client *mdsc;
  1235. dout("dentry_dir_lease_touch %p %p '%pd' (offset 0x%llx)\n",
  1236. di, dn, dn, di->offset);
  1237. if (!list_empty(&di->lease_list)) {
  1238. if (di->flags & CEPH_DENTRY_LEASE_LIST) {
  1239. /* don't remove dentry from dentry lease list
  1240. * if its lease is valid */
  1241. if (__dentry_lease_is_valid(di))
  1242. return;
  1243. } else {
  1244. di->flags |= CEPH_DENTRY_REFERENCED;
  1245. return;
  1246. }
  1247. }
  1248. if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
  1249. di->flags |= CEPH_DENTRY_REFERENCED;
  1250. di->flags &= ~CEPH_DENTRY_LEASE_LIST;
  1251. return;
  1252. }
  1253. mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
  1254. spin_lock(&mdsc->dentry_list_lock);
  1255. __dentry_dir_lease_touch(mdsc, di),
  1256. spin_unlock(&mdsc->dentry_list_lock);
  1257. }
  1258. static void __dentry_lease_unlist(struct ceph_dentry_info *di)
  1259. {
  1260. struct ceph_mds_client *mdsc;
  1261. if (di->flags & CEPH_DENTRY_SHRINK_LIST)
  1262. return;
  1263. if (list_empty(&di->lease_list))
  1264. return;
  1265. mdsc = ceph_sb_to_client(di->dentry->d_sb)->mdsc;
  1266. spin_lock(&mdsc->dentry_list_lock);
  1267. list_del_init(&di->lease_list);
  1268. spin_unlock(&mdsc->dentry_list_lock);
  1269. }
  1270. enum {
  1271. KEEP = 0,
  1272. DELETE = 1,
  1273. TOUCH = 2,
  1274. STOP = 4,
  1275. };
  1276. struct ceph_lease_walk_control {
  1277. bool dir_lease;
  1278. bool expire_dir_lease;
  1279. unsigned long nr_to_scan;
  1280. unsigned long dir_lease_ttl;
  1281. };
  1282. static unsigned long
  1283. __dentry_leases_walk(struct ceph_mds_client *mdsc,
  1284. struct ceph_lease_walk_control *lwc,
  1285. int (*check)(struct dentry*, void*))
  1286. {
  1287. struct ceph_dentry_info *di, *tmp;
  1288. struct dentry *dentry, *last = NULL;
  1289. struct list_head* list;
  1290. LIST_HEAD(dispose);
  1291. unsigned long freed = 0;
  1292. int ret = 0;
  1293. list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases;
  1294. spin_lock(&mdsc->dentry_list_lock);
  1295. list_for_each_entry_safe(di, tmp, list, lease_list) {
  1296. if (!lwc->nr_to_scan)
  1297. break;
  1298. --lwc->nr_to_scan;
  1299. dentry = di->dentry;
  1300. if (last == dentry)
  1301. break;
  1302. if (!spin_trylock(&dentry->d_lock))
  1303. continue;
  1304. if (__lockref_is_dead(&dentry->d_lockref)) {
  1305. list_del_init(&di->lease_list);
  1306. goto next;
  1307. }
  1308. ret = check(dentry, lwc);
  1309. if (ret & TOUCH) {
  1310. /* move it into tail of dir lease list */
  1311. __dentry_dir_lease_touch(mdsc, di);
  1312. if (!last)
  1313. last = dentry;
  1314. }
  1315. if (ret & DELETE) {
  1316. /* stale lease */
  1317. di->flags &= ~CEPH_DENTRY_REFERENCED;
  1318. if (dentry->d_lockref.count > 0) {
  1319. /* update_dentry_lease() will re-add
  1320. * it to lease list, or
  1321. * ceph_d_delete() will return 1 when
  1322. * last reference is dropped */
  1323. list_del_init(&di->lease_list);
  1324. } else {
  1325. di->flags |= CEPH_DENTRY_SHRINK_LIST;
  1326. list_move_tail(&di->lease_list, &dispose);
  1327. dget_dlock(dentry);
  1328. }
  1329. }
  1330. next:
  1331. spin_unlock(&dentry->d_lock);
  1332. if (ret & STOP)
  1333. break;
  1334. }
  1335. spin_unlock(&mdsc->dentry_list_lock);
  1336. while (!list_empty(&dispose)) {
  1337. di = list_first_entry(&dispose, struct ceph_dentry_info,
  1338. lease_list);
  1339. dentry = di->dentry;
  1340. spin_lock(&dentry->d_lock);
  1341. list_del_init(&di->lease_list);
  1342. di->flags &= ~CEPH_DENTRY_SHRINK_LIST;
  1343. if (di->flags & CEPH_DENTRY_REFERENCED) {
  1344. spin_lock(&mdsc->dentry_list_lock);
  1345. if (di->flags & CEPH_DENTRY_LEASE_LIST) {
  1346. list_add_tail(&di->lease_list,
  1347. &mdsc->dentry_leases);
  1348. } else {
  1349. __dentry_dir_lease_touch(mdsc, di);
  1350. }
  1351. spin_unlock(&mdsc->dentry_list_lock);
  1352. } else {
  1353. freed++;
  1354. }
  1355. spin_unlock(&dentry->d_lock);
  1356. /* ceph_d_delete() does the trick */
  1357. dput(dentry);
  1358. }
  1359. return freed;
  1360. }
  1361. static int __dentry_lease_check(struct dentry *dentry, void *arg)
  1362. {
  1363. struct ceph_dentry_info *di = ceph_dentry(dentry);
  1364. int ret;
  1365. if (__dentry_lease_is_valid(di))
  1366. return STOP;
  1367. ret = __dir_lease_try_check(dentry);
  1368. if (ret == -EBUSY)
  1369. return KEEP;
  1370. if (ret > 0)
  1371. return TOUCH;
  1372. return DELETE;
  1373. }
  1374. static int __dir_lease_check(struct dentry *dentry, void *arg)
  1375. {
  1376. struct ceph_lease_walk_control *lwc = arg;
  1377. struct ceph_dentry_info *di = ceph_dentry(dentry);
  1378. int ret = __dir_lease_try_check(dentry);
  1379. if (ret == -EBUSY)
  1380. return KEEP;
  1381. if (ret > 0) {
  1382. if (time_before(jiffies, di->time + lwc->dir_lease_ttl))
  1383. return STOP;
  1384. /* Move dentry to tail of dir lease list if we don't want
  1385. * to delete it. So dentries in the list are checked in a
  1386. * round robin manner */
  1387. if (!lwc->expire_dir_lease)
  1388. return TOUCH;
  1389. if (dentry->d_lockref.count > 0 ||
  1390. (di->flags & CEPH_DENTRY_REFERENCED))
  1391. return TOUCH;
  1392. /* invalidate dir lease */
  1393. di->lease_shared_gen = 0;
  1394. }
  1395. return DELETE;
  1396. }
  1397. int ceph_trim_dentries(struct ceph_mds_client *mdsc)
  1398. {
  1399. struct ceph_lease_walk_control lwc;
  1400. unsigned long count;
  1401. unsigned long freed;
  1402. spin_lock(&mdsc->caps_list_lock);
  1403. if (mdsc->caps_use_max > 0 &&
  1404. mdsc->caps_use_count > mdsc->caps_use_max)
  1405. count = mdsc->caps_use_count - mdsc->caps_use_max;
  1406. else
  1407. count = 0;
  1408. spin_unlock(&mdsc->caps_list_lock);
  1409. lwc.dir_lease = false;
  1410. lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2;
  1411. freed = __dentry_leases_walk(mdsc, &lwc, __dentry_lease_check);
  1412. if (!lwc.nr_to_scan) /* more invalid leases */
  1413. return -EAGAIN;
  1414. if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE)
  1415. lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE;
  1416. lwc.dir_lease = true;
  1417. lwc.expire_dir_lease = freed < count;
  1418. lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ;
  1419. freed +=__dentry_leases_walk(mdsc, &lwc, __dir_lease_check);
  1420. if (!lwc.nr_to_scan) /* more to check */
  1421. return -EAGAIN;
  1422. return freed > 0 ? 1 : 0;
  1423. }
  1424. /*
  1425. * Ensure a dentry lease will no longer revalidate.
  1426. */
  1427. void ceph_invalidate_dentry_lease(struct dentry *dentry)
  1428. {
  1429. struct ceph_dentry_info *di = ceph_dentry(dentry);
  1430. spin_lock(&dentry->d_lock);
  1431. di->time = jiffies;
  1432. di->lease_shared_gen = 0;
  1433. di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
  1434. __dentry_lease_unlist(di);
  1435. spin_unlock(&dentry->d_lock);
  1436. }
  1437. /*
  1438. * Check if dentry lease is valid. If not, delete the lease. Try to
  1439. * renew if the least is more than half up.
  1440. */
  1441. static bool __dentry_lease_is_valid(struct ceph_dentry_info *di)
  1442. {
  1443. struct ceph_mds_session *session;
  1444. if (!di->lease_gen)
  1445. return false;
  1446. session = di->lease_session;
  1447. if (session) {
  1448. u32 gen;
  1449. unsigned long ttl;
  1450. gen = atomic_read(&session->s_cap_gen);
  1451. ttl = session->s_cap_ttl;
  1452. if (di->lease_gen == gen &&
  1453. time_before(jiffies, ttl) &&
  1454. time_before(jiffies, di->time))
  1455. return true;
  1456. }
  1457. di->lease_gen = 0;
  1458. return false;
  1459. }
  1460. static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags)
  1461. {
  1462. struct ceph_dentry_info *di;
  1463. struct ceph_mds_session *session = NULL;
  1464. u32 seq = 0;
  1465. int valid = 0;
  1466. spin_lock(&dentry->d_lock);
  1467. di = ceph_dentry(dentry);
  1468. if (di && __dentry_lease_is_valid(di)) {
  1469. valid = 1;
  1470. if (di->lease_renew_after &&
  1471. time_after(jiffies, di->lease_renew_after)) {
  1472. /*
  1473. * We should renew. If we're in RCU walk mode
  1474. * though, we can't do that so just return
  1475. * -ECHILD.
  1476. */
  1477. if (flags & LOOKUP_RCU) {
  1478. valid = -ECHILD;
  1479. } else {
  1480. session = ceph_get_mds_session(di->lease_session);
  1481. seq = di->lease_seq;
  1482. di->lease_renew_after = 0;
  1483. di->lease_renew_from = jiffies;
  1484. }
  1485. }
  1486. }
  1487. spin_unlock(&dentry->d_lock);
  1488. if (session) {
  1489. ceph_mdsc_lease_send_msg(session, dentry,
  1490. CEPH_MDS_LEASE_RENEW, seq);
  1491. ceph_put_mds_session(session);
  1492. }
  1493. dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
  1494. return valid;
  1495. }
  1496. /*
  1497. * Called under dentry->d_lock.
  1498. */
  1499. static int __dir_lease_try_check(const struct dentry *dentry)
  1500. {
  1501. struct ceph_dentry_info *di = ceph_dentry(dentry);
  1502. struct inode *dir;
  1503. struct ceph_inode_info *ci;
  1504. int valid = 0;
  1505. if (!di->lease_shared_gen)
  1506. return 0;
  1507. if (IS_ROOT(dentry))
  1508. return 0;
  1509. dir = d_inode(dentry->d_parent);
  1510. ci = ceph_inode(dir);
  1511. if (spin_trylock(&ci->i_ceph_lock)) {
  1512. if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen &&
  1513. __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0))
  1514. valid = 1;
  1515. spin_unlock(&ci->i_ceph_lock);
  1516. } else {
  1517. valid = -EBUSY;
  1518. }
  1519. if (!valid)
  1520. di->lease_shared_gen = 0;
  1521. return valid;
  1522. }
  1523. /*
  1524. * Check if directory-wide content lease/cap is valid.
  1525. */
  1526. static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry,
  1527. struct ceph_mds_client *mdsc)
  1528. {
  1529. struct ceph_inode_info *ci = ceph_inode(dir);
  1530. int valid;
  1531. int shared_gen;
  1532. spin_lock(&ci->i_ceph_lock);
  1533. valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
  1534. if (valid) {
  1535. __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);
  1536. shared_gen = atomic_read(&ci->i_shared_gen);
  1537. }
  1538. spin_unlock(&ci->i_ceph_lock);
  1539. if (valid) {
  1540. struct ceph_dentry_info *di;
  1541. spin_lock(&dentry->d_lock);
  1542. di = ceph_dentry(dentry);
  1543. if (dir == d_inode(dentry->d_parent) &&
  1544. di && di->lease_shared_gen == shared_gen)
  1545. __ceph_dentry_dir_lease_touch(di);
  1546. else
  1547. valid = 0;
  1548. spin_unlock(&dentry->d_lock);
  1549. }
  1550. dout("dir_lease_is_valid dir %p v%u dentry %p = %d\n",
  1551. dir, (unsigned)atomic_read(&ci->i_shared_gen), dentry, valid);
  1552. return valid;
  1553. }
  1554. /*
  1555. * Check if cached dentry can be trusted.
  1556. */
  1557. static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
  1558. {
  1559. int valid = 0;
  1560. struct dentry *parent;
  1561. struct inode *dir, *inode;
  1562. struct ceph_mds_client *mdsc;
  1563. if (flags & LOOKUP_RCU) {
  1564. parent = READ_ONCE(dentry->d_parent);
  1565. dir = d_inode_rcu(parent);
  1566. if (!dir)
  1567. return -ECHILD;
  1568. inode = d_inode_rcu(dentry);
  1569. } else {
  1570. parent = dget_parent(dentry);
  1571. dir = d_inode(parent);
  1572. inode = d_inode(dentry);
  1573. }
  1574. dout("d_revalidate %p '%pd' inode %p offset 0x%llx\n", dentry,
  1575. dentry, inode, ceph_dentry(dentry)->offset);
  1576. mdsc = ceph_sb_to_client(dir->i_sb)->mdsc;
  1577. /* always trust cached snapped dentries, snapdir dentry */
  1578. if (ceph_snap(dir) != CEPH_NOSNAP) {
  1579. dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
  1580. dentry, inode);
  1581. valid = 1;
  1582. } else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
  1583. valid = 1;
  1584. } else {
  1585. valid = dentry_lease_is_valid(dentry, flags);
  1586. if (valid == -ECHILD)
  1587. return valid;
  1588. if (valid || dir_lease_is_valid(dir, dentry, mdsc)) {
  1589. if (inode)
  1590. valid = ceph_is_any_caps(inode);
  1591. else
  1592. valid = 1;
  1593. }
  1594. }
  1595. if (!valid) {
  1596. struct ceph_mds_request *req;
  1597. int op, err;
  1598. u32 mask;
  1599. if (flags & LOOKUP_RCU)
  1600. return -ECHILD;
  1601. percpu_counter_inc(&mdsc->metric.d_lease_mis);
  1602. op = ceph_snap(dir) == CEPH_SNAPDIR ?
  1603. CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
  1604. req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
  1605. if (!IS_ERR(req)) {
  1606. req->r_dentry = dget(dentry);
  1607. req->r_num_caps = 2;
  1608. req->r_parent = dir;
  1609. ihold(dir);
  1610. mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
  1611. if (ceph_security_xattr_wanted(dir))
  1612. mask |= CEPH_CAP_XATTR_SHARED;
  1613. req->r_args.getattr.mask = cpu_to_le32(mask);
  1614. err = ceph_mdsc_do_request(mdsc, NULL, req);
  1615. switch (err) {
  1616. case 0:
  1617. if (d_really_is_positive(dentry) &&
  1618. d_inode(dentry) == req->r_target_inode)
  1619. valid = 1;
  1620. break;
  1621. case -ENOENT:
  1622. if (d_really_is_negative(dentry))
  1623. valid = 1;
  1624. fallthrough;
  1625. default:
  1626. break;
  1627. }
  1628. ceph_mdsc_put_request(req);
  1629. dout("d_revalidate %p lookup result=%d\n",
  1630. dentry, err);
  1631. }
  1632. } else {
  1633. percpu_counter_inc(&mdsc->metric.d_lease_hit);
  1634. }
  1635. dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
  1636. if (!valid)
  1637. ceph_dir_clear_complete(dir);
  1638. if (!(flags & LOOKUP_RCU))
  1639. dput(parent);
  1640. return valid;
  1641. }
  1642. /*
  1643. * Delete unused dentry that doesn't have valid lease
  1644. *
  1645. * Called under dentry->d_lock.
  1646. */
  1647. static int ceph_d_delete(const struct dentry *dentry)
  1648. {
  1649. struct ceph_dentry_info *di;
  1650. /* won't release caps */
  1651. if (d_really_is_negative(dentry))
  1652. return 0;
  1653. if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
  1654. return 0;
  1655. /* vaild lease? */
  1656. di = ceph_dentry(dentry);
  1657. if (di) {
  1658. if (__dentry_lease_is_valid(di))
  1659. return 0;
  1660. if (__dir_lease_try_check(dentry))
  1661. return 0;
  1662. }
  1663. return 1;
  1664. }
  1665. /*
  1666. * Release our ceph_dentry_info.
  1667. */
  1668. static void ceph_d_release(struct dentry *dentry)
  1669. {
  1670. struct ceph_dentry_info *di = ceph_dentry(dentry);
  1671. struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
  1672. dout("d_release %p\n", dentry);
  1673. atomic64_dec(&fsc->mdsc->metric.total_dentries);
  1674. spin_lock(&dentry->d_lock);
  1675. __dentry_lease_unlist(di);
  1676. dentry->d_fsdata = NULL;
  1677. spin_unlock(&dentry->d_lock);
  1678. ceph_put_mds_session(di->lease_session);
  1679. kmem_cache_free(ceph_dentry_cachep, di);
  1680. }
  1681. /*
  1682. * When the VFS prunes a dentry from the cache, we need to clear the
  1683. * complete flag on the parent directory.
  1684. *
  1685. * Called under dentry->d_lock.
  1686. */
  1687. static void ceph_d_prune(struct dentry *dentry)
  1688. {
  1689. struct ceph_inode_info *dir_ci;
  1690. struct ceph_dentry_info *di;
  1691. dout("ceph_d_prune %pd %p\n", dentry, dentry);
  1692. /* do we have a valid parent? */
  1693. if (IS_ROOT(dentry))
  1694. return;
  1695. /* we hold d_lock, so d_parent is stable */
  1696. dir_ci = ceph_inode(d_inode(dentry->d_parent));
  1697. if (dir_ci->i_vino.snap == CEPH_SNAPDIR)
  1698. return;
  1699. /* who calls d_delete() should also disable dcache readdir */
  1700. if (d_really_is_negative(dentry))
  1701. return;
  1702. /* d_fsdata does not get cleared until d_release */
  1703. if (!d_unhashed(dentry)) {
  1704. __ceph_dir_clear_complete(dir_ci);
  1705. return;
  1706. }
  1707. /* Disable dcache readdir just in case that someone called d_drop()
  1708. * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED
  1709. * properly (dcache readdir is still enabled) */
  1710. di = ceph_dentry(dentry);
  1711. if (di->offset > 0 &&
  1712. di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen))
  1713. __ceph_dir_clear_ordered(dir_ci);
  1714. }
  1715. /*
  1716. * read() on a dir. This weird interface hack only works if mounted
  1717. * with '-o dirstat'.
  1718. */
  1719. static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
  1720. loff_t *ppos)
  1721. {
  1722. struct ceph_dir_file_info *dfi = file->private_data;
  1723. struct inode *inode = file_inode(file);
  1724. struct ceph_inode_info *ci = ceph_inode(inode);
  1725. int left;
  1726. const int bufsize = 1024;
  1727. if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
  1728. return -EISDIR;
  1729. if (!dfi->dir_info) {
  1730. dfi->dir_info = kmalloc(bufsize, GFP_KERNEL);
  1731. if (!dfi->dir_info)
  1732. return -ENOMEM;
  1733. dfi->dir_info_len =
  1734. snprintf(dfi->dir_info, bufsize,
  1735. "entries: %20lld\n"
  1736. " files: %20lld\n"
  1737. " subdirs: %20lld\n"
  1738. "rentries: %20lld\n"
  1739. " rfiles: %20lld\n"
  1740. " rsubdirs: %20lld\n"
  1741. "rbytes: %20lld\n"
  1742. "rctime: %10lld.%09ld\n",
  1743. ci->i_files + ci->i_subdirs,
  1744. ci->i_files,
  1745. ci->i_subdirs,
  1746. ci->i_rfiles + ci->i_rsubdirs,
  1747. ci->i_rfiles,
  1748. ci->i_rsubdirs,
  1749. ci->i_rbytes,
  1750. ci->i_rctime.tv_sec,
  1751. ci->i_rctime.tv_nsec);
  1752. }
  1753. if (*ppos >= dfi->dir_info_len)
  1754. return 0;
  1755. size = min_t(unsigned, size, dfi->dir_info_len-*ppos);
  1756. left = copy_to_user(buf, dfi->dir_info + *ppos, size);
  1757. if (left == size)
  1758. return -EFAULT;
  1759. *ppos += (size - left);
  1760. return size - left;
  1761. }
  1762. /*
  1763. * Return name hash for a given dentry. This is dependent on
  1764. * the parent directory's hash function.
  1765. */
  1766. unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
  1767. {
  1768. struct ceph_inode_info *dci = ceph_inode(dir);
  1769. unsigned hash;
  1770. switch (dci->i_dir_layout.dl_dir_hash) {
  1771. case 0: /* for backward compat */
  1772. case CEPH_STR_HASH_LINUX:
  1773. return dn->d_name.hash;
  1774. default:
  1775. spin_lock(&dn->d_lock);
  1776. hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
  1777. dn->d_name.name, dn->d_name.len);
  1778. spin_unlock(&dn->d_lock);
  1779. return hash;
  1780. }
  1781. }
  1782. const struct file_operations ceph_dir_fops = {
  1783. .read = ceph_read_dir,
  1784. .iterate = ceph_readdir,
  1785. .llseek = ceph_dir_llseek,
  1786. .open = ceph_open,
  1787. .release = ceph_release,
  1788. .unlocked_ioctl = ceph_ioctl,
  1789. .compat_ioctl = compat_ptr_ioctl,
  1790. .fsync = ceph_fsync,
  1791. .lock = ceph_lock,
  1792. .flock = ceph_flock,
  1793. };
  1794. const struct file_operations ceph_snapdir_fops = {
  1795. .iterate = ceph_readdir,
  1796. .llseek = ceph_dir_llseek,
  1797. .open = ceph_open,
  1798. .release = ceph_release,
  1799. };
  1800. const struct inode_operations ceph_dir_iops = {
  1801. .lookup = ceph_lookup,
  1802. .permission = ceph_permission,
  1803. .getattr = ceph_getattr,
  1804. .setattr = ceph_setattr,
  1805. .listxattr = ceph_listxattr,
  1806. .get_acl = ceph_get_acl,
  1807. .set_acl = ceph_set_acl,
  1808. .mknod = ceph_mknod,
  1809. .symlink = ceph_symlink,
  1810. .mkdir = ceph_mkdir,
  1811. .link = ceph_link,
  1812. .unlink = ceph_unlink,
  1813. .rmdir = ceph_unlink,
  1814. .rename = ceph_rename,
  1815. .create = ceph_create,
  1816. .atomic_open = ceph_atomic_open,
  1817. };
  1818. const struct inode_operations ceph_snapdir_iops = {
  1819. .lookup = ceph_lookup,
  1820. .permission = ceph_permission,
  1821. .getattr = ceph_getattr,
  1822. .mkdir = ceph_mkdir,
  1823. .rmdir = ceph_unlink,
  1824. .rename = ceph_rename,
  1825. };
  1826. const struct dentry_operations ceph_dentry_ops = {
  1827. .d_revalidate = ceph_d_revalidate,
  1828. .d_delete = ceph_d_delete,
  1829. .d_release = ceph_d_release,
  1830. .d_prune = ceph_d_prune,
  1831. .d_init = ceph_d_init,
  1832. };