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TOMOYO Linux Cross Reference
Linux/fs/ceph/dir.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <linux/ceph/ceph_debug.h>
  3 
  4 #include <linux/spinlock.h>
  5 #include <linux/namei.h>
  6 #include <linux/slab.h>
  7 #include <linux/sched.h>
  8 #include <linux/xattr.h>
  9 
 10 #include "super.h"
 11 #include "mds_client.h"
 12 
 13 /*
 14  * Directory operations: readdir, lookup, create, link, unlink,
 15  * rename, etc.
 16  */
 17 
 18 /*
 19  * Ceph MDS operations are specified in terms of a base ino and
 20  * relative path.  Thus, the client can specify an operation on a
 21  * specific inode (e.g., a getattr due to fstat(2)), or as a path
 22  * relative to, say, the root directory.
 23  *
 24  * Normally, we limit ourselves to strict inode ops (no path component)
 25  * or dentry operations (a single path component relative to an ino).  The
 26  * exception to this is open_root_dentry(), which will open the mount
 27  * point by name.
 28  */
 29 
 30 const struct dentry_operations ceph_dentry_ops;
 31 
 32 static bool __dentry_lease_is_valid(struct ceph_dentry_info *di);
 33 static int __dir_lease_try_check(const struct dentry *dentry);
 34 
 35 /*
 36  * Initialize ceph dentry state.
 37  */
 38 static int ceph_d_init(struct dentry *dentry)
 39 {
 40         struct ceph_dentry_info *di;
 41 
 42         di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL);
 43         if (!di)
 44                 return -ENOMEM;          /* oh well */
 45 
 46         di->dentry = dentry;
 47         di->lease_session = NULL;
 48         di->time = jiffies;
 49         dentry->d_fsdata = di;
 50         INIT_LIST_HEAD(&di->lease_list);
 51         return 0;
 52 }
 53 
 54 /*
 55  * for f_pos for readdir:
 56  * - hash order:
 57  *      (0xff << 52) | ((24 bits hash) << 28) |
 58  *      (the nth entry has hash collision);
 59  * - frag+name order;
 60  *      ((frag value) << 28) | (the nth entry in frag);
 61  */
 62 #define OFFSET_BITS     28
 63 #define OFFSET_MASK     ((1 << OFFSET_BITS) - 1)
 64 #define HASH_ORDER      (0xffull << (OFFSET_BITS + 24))
 65 loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order)
 66 {
 67         loff_t fpos = ((loff_t)high << 28) | (loff_t)off;
 68         if (hash_order)
 69                 fpos |= HASH_ORDER;
 70         return fpos;
 71 }
 72 
 73 static bool is_hash_order(loff_t p)
 74 {
 75         return (p & HASH_ORDER) == HASH_ORDER;
 76 }
 77 
 78 static unsigned fpos_frag(loff_t p)
 79 {
 80         return p >> OFFSET_BITS;
 81 }
 82 
 83 static unsigned fpos_hash(loff_t p)
 84 {
 85         return ceph_frag_value(fpos_frag(p));
 86 }
 87 
 88 static unsigned fpos_off(loff_t p)
 89 {
 90         return p & OFFSET_MASK;
 91 }
 92 
 93 static int fpos_cmp(loff_t l, loff_t r)
 94 {
 95         int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
 96         if (v)
 97                 return v;
 98         return (int)(fpos_off(l) - fpos_off(r));
 99 }
100 
101 /*
102  * make note of the last dentry we read, so we can
103  * continue at the same lexicographical point,
104  * regardless of what dir changes take place on the
105  * server.
106  */
107 static int note_last_dentry(struct ceph_dir_file_info *dfi, const char *name,
108                             int len, unsigned next_offset)
109 {
110         char *buf = kmalloc(len+1, GFP_KERNEL);
111         if (!buf)
112                 return -ENOMEM;
113         kfree(dfi->last_name);
114         dfi->last_name = buf;
115         memcpy(dfi->last_name, name, len);
116         dfi->last_name[len] = 0;
117         dfi->next_offset = next_offset;
118         dout("note_last_dentry '%s'\n", dfi->last_name);
119         return 0;
120 }
121 
122 
123 static struct dentry *
124 __dcache_find_get_entry(struct dentry *parent, u64 idx,
125                         struct ceph_readdir_cache_control *cache_ctl)
126 {
127         struct inode *dir = d_inode(parent);
128         struct dentry *dentry;
129         unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1;
130         loff_t ptr_pos = idx * sizeof(struct dentry *);
131         pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT;
132 
133         if (ptr_pos >= i_size_read(dir))
134                 return NULL;
135 
136         if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) {
137                 ceph_readdir_cache_release(cache_ctl);
138                 cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff);
139                 if (!cache_ctl->page) {
140                         dout(" page %lu not found\n", ptr_pgoff);
141                         return ERR_PTR(-EAGAIN);
142                 }
143                 /* reading/filling the cache are serialized by
144                    i_mutex, no need to use page lock */
145                 unlock_page(cache_ctl->page);
146                 cache_ctl->dentries = kmap(cache_ctl->page);
147         }
148 
149         cache_ctl->index = idx & idx_mask;
150 
151         rcu_read_lock();
152         spin_lock(&parent->d_lock);
153         /* check i_size again here, because empty directory can be
154          * marked as complete while not holding the i_mutex. */
155         if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir))
156                 dentry = cache_ctl->dentries[cache_ctl->index];
157         else
158                 dentry = NULL;
159         spin_unlock(&parent->d_lock);
160         if (dentry && !lockref_get_not_dead(&dentry->d_lockref))
161                 dentry = NULL;
162         rcu_read_unlock();
163         return dentry ? : ERR_PTR(-EAGAIN);
164 }
165 
166 /*
167  * When possible, we try to satisfy a readdir by peeking at the
168  * dcache.  We make this work by carefully ordering dentries on
169  * d_child when we initially get results back from the MDS, and
170  * falling back to a "normal" sync readdir if any dentries in the dir
171  * are dropped.
172  *
173  * Complete dir indicates that we have all dentries in the dir.  It is
174  * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
175  * the MDS if/when the directory is modified).
176  */
177 static int __dcache_readdir(struct file *file,  struct dir_context *ctx,
178                             int shared_gen)
179 {
180         struct ceph_dir_file_info *dfi = file->private_data;
181         struct dentry *parent = file->f_path.dentry;
182         struct inode *dir = d_inode(parent);
183         struct dentry *dentry, *last = NULL;
184         struct ceph_dentry_info *di;
185         struct ceph_readdir_cache_control cache_ctl = {};
186         u64 idx = 0;
187         int err = 0;
188 
189         dout("__dcache_readdir %p v%u at %llx\n", dir, (unsigned)shared_gen, ctx->pos);
190 
191         /* search start position */
192         if (ctx->pos > 2) {
193                 u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *));
194                 while (count > 0) {
195                         u64 step = count >> 1;
196                         dentry = __dcache_find_get_entry(parent, idx + step,
197                                                          &cache_ctl);
198                         if (!dentry) {
199                                 /* use linar search */
200                                 idx = 0;
201                                 break;
202                         }
203                         if (IS_ERR(dentry)) {
204                                 err = PTR_ERR(dentry);
205                                 goto out;
206                         }
207                         di = ceph_dentry(dentry);
208                         spin_lock(&dentry->d_lock);
209                         if (fpos_cmp(di->offset, ctx->pos) < 0) {
210                                 idx += step + 1;
211                                 count -= step + 1;
212                         } else {
213                                 count = step;
214                         }
215                         spin_unlock(&dentry->d_lock);
216                         dput(dentry);
217                 }
218 
219                 dout("__dcache_readdir %p cache idx %llu\n", dir, idx);
220         }
221 
222 
223         for (;;) {
224                 bool emit_dentry = false;
225                 dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl);
226                 if (!dentry) {
227                         dfi->file_info.flags |= CEPH_F_ATEND;
228                         err = 0;
229                         break;
230                 }
231                 if (IS_ERR(dentry)) {
232                         err = PTR_ERR(dentry);
233                         goto out;
234                 }
235 
236                 spin_lock(&dentry->d_lock);
237                 di = ceph_dentry(dentry);
238                 if (d_unhashed(dentry) ||
239                     d_really_is_negative(dentry) ||
240                     di->lease_shared_gen != shared_gen) {
241                         spin_unlock(&dentry->d_lock);
242                         dput(dentry);
243                         err = -EAGAIN;
244                         goto out;
245                 }
246                 if (fpos_cmp(ctx->pos, di->offset) <= 0) {
247                         __ceph_dentry_dir_lease_touch(di);
248                         emit_dentry = true;
249                 }
250                 spin_unlock(&dentry->d_lock);
251 
252                 if (emit_dentry) {
253                         dout(" %llx dentry %p %pd %p\n", di->offset,
254                              dentry, dentry, d_inode(dentry));
255                         ctx->pos = di->offset;
256                         if (!dir_emit(ctx, dentry->d_name.name,
257                                       dentry->d_name.len,
258                                       ceph_translate_ino(dentry->d_sb,
259                                                          d_inode(dentry)->i_ino),
260                                       d_inode(dentry)->i_mode >> 12)) {
261                                 dput(dentry);
262                                 err = 0;
263                                 break;
264                         }
265                         ctx->pos++;
266 
267                         if (last)
268                                 dput(last);
269                         last = dentry;
270                 } else {
271                         dput(dentry);
272                 }
273         }
274 out:
275         ceph_readdir_cache_release(&cache_ctl);
276         if (last) {
277                 int ret;
278                 di = ceph_dentry(last);
279                 ret = note_last_dentry(dfi, last->d_name.name, last->d_name.len,
280                                        fpos_off(di->offset) + 1);
281                 if (ret < 0)
282                         err = ret;
283                 dput(last);
284                 /* last_name no longer match cache index */
285                 if (dfi->readdir_cache_idx >= 0) {
286                         dfi->readdir_cache_idx = -1;
287                         dfi->dir_release_count = 0;
288                 }
289         }
290         return err;
291 }
292 
293 static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos)
294 {
295         if (!dfi->last_readdir)
296                 return true;
297         if (is_hash_order(pos))
298                 return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos));
299         else
300                 return dfi->frag != fpos_frag(pos);
301 }
302 
303 static int ceph_readdir(struct file *file, struct dir_context *ctx)
304 {
305         struct ceph_dir_file_info *dfi = file->private_data;
306         struct inode *inode = file_inode(file);
307         struct ceph_inode_info *ci = ceph_inode(inode);
308         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
309         struct ceph_mds_client *mdsc = fsc->mdsc;
310         int i;
311         int err;
312         unsigned frag = -1;
313         struct ceph_mds_reply_info_parsed *rinfo;
314 
315         dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos);
316         if (dfi->file_info.flags & CEPH_F_ATEND)
317                 return 0;
318 
319         /* always start with . and .. */
320         if (ctx->pos == 0) {
321                 dout("readdir off 0 -> '.'\n");
322                 if (!dir_emit(ctx, ".", 1, 
323                             ceph_translate_ino(inode->i_sb, inode->i_ino),
324                             inode->i_mode >> 12))
325                         return 0;
326                 ctx->pos = 1;
327         }
328         if (ctx->pos == 1) {
329                 ino_t ino = parent_ino(file->f_path.dentry);
330                 dout("readdir off 1 -> '..'\n");
331                 if (!dir_emit(ctx, "..", 2,
332                             ceph_translate_ino(inode->i_sb, ino),
333                             inode->i_mode >> 12))
334                         return 0;
335                 ctx->pos = 2;
336         }
337 
338         /* can we use the dcache? */
339         spin_lock(&ci->i_ceph_lock);
340         if (ceph_test_mount_opt(fsc, DCACHE) &&
341             !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
342             ceph_snap(inode) != CEPH_SNAPDIR &&
343             __ceph_dir_is_complete_ordered(ci) &&
344             __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
345                 int shared_gen = atomic_read(&ci->i_shared_gen);
346                 spin_unlock(&ci->i_ceph_lock);
347                 err = __dcache_readdir(file, ctx, shared_gen);
348                 if (err != -EAGAIN)
349                         return err;
350         } else {
351                 spin_unlock(&ci->i_ceph_lock);
352         }
353 
354         /* proceed with a normal readdir */
355 more:
356         /* do we have the correct frag content buffered? */
357         if (need_send_readdir(dfi, ctx->pos)) {
358                 struct ceph_mds_request *req;
359                 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
360                         CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
361 
362                 /* discard old result, if any */
363                 if (dfi->last_readdir) {
364                         ceph_mdsc_put_request(dfi->last_readdir);
365                         dfi->last_readdir = NULL;
366                 }
367 
368                 if (is_hash_order(ctx->pos)) {
369                         /* fragtree isn't always accurate. choose frag
370                          * based on previous reply when possible. */
371                         if (frag == (unsigned)-1)
372                                 frag = ceph_choose_frag(ci, fpos_hash(ctx->pos),
373                                                         NULL, NULL);
374                 } else {
375                         frag = fpos_frag(ctx->pos);
376                 }
377 
378                 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
379                      ceph_vinop(inode), frag, dfi->last_name);
380                 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
381                 if (IS_ERR(req))
382                         return PTR_ERR(req);
383                 err = ceph_alloc_readdir_reply_buffer(req, inode);
384                 if (err) {
385                         ceph_mdsc_put_request(req);
386                         return err;
387                 }
388                 /* hints to request -> mds selection code */
389                 req->r_direct_mode = USE_AUTH_MDS;
390                 if (op == CEPH_MDS_OP_READDIR) {
391                         req->r_direct_hash = ceph_frag_value(frag);
392                         __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
393                         req->r_inode_drop = CEPH_CAP_FILE_EXCL;
394                 }
395                 if (dfi->last_name) {
396                         req->r_path2 = kstrdup(dfi->last_name, GFP_KERNEL);
397                         if (!req->r_path2) {
398                                 ceph_mdsc_put_request(req);
399                                 return -ENOMEM;
400                         }
401                 } else if (is_hash_order(ctx->pos)) {
402                         req->r_args.readdir.offset_hash =
403                                 cpu_to_le32(fpos_hash(ctx->pos));
404                 }
405 
406                 req->r_dir_release_cnt = dfi->dir_release_count;
407                 req->r_dir_ordered_cnt = dfi->dir_ordered_count;
408                 req->r_readdir_cache_idx = dfi->readdir_cache_idx;
409                 req->r_readdir_offset = dfi->next_offset;
410                 req->r_args.readdir.frag = cpu_to_le32(frag);
411                 req->r_args.readdir.flags =
412                                 cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
413 
414                 req->r_inode = inode;
415                 ihold(inode);
416                 req->r_dentry = dget(file->f_path.dentry);
417                 err = ceph_mdsc_do_request(mdsc, NULL, req);
418                 if (err < 0) {
419                         ceph_mdsc_put_request(req);
420                         return err;
421                 }
422                 dout("readdir got and parsed readdir result=%d on "
423                      "frag %x, end=%d, complete=%d, hash_order=%d\n",
424                      err, frag,
425                      (int)req->r_reply_info.dir_end,
426                      (int)req->r_reply_info.dir_complete,
427                      (int)req->r_reply_info.hash_order);
428 
429                 rinfo = &req->r_reply_info;
430                 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
431                         frag = le32_to_cpu(rinfo->dir_dir->frag);
432                         if (!rinfo->hash_order) {
433                                 dfi->next_offset = req->r_readdir_offset;
434                                 /* adjust ctx->pos to beginning of frag */
435                                 ctx->pos = ceph_make_fpos(frag,
436                                                           dfi->next_offset,
437                                                           false);
438                         }
439                 }
440 
441                 dfi->frag = frag;
442                 dfi->last_readdir = req;
443 
444                 if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) {
445                         dfi->readdir_cache_idx = req->r_readdir_cache_idx;
446                         if (dfi->readdir_cache_idx < 0) {
447                                 /* preclude from marking dir ordered */
448                                 dfi->dir_ordered_count = 0;
449                         } else if (ceph_frag_is_leftmost(frag) &&
450                                    dfi->next_offset == 2) {
451                                 /* note dir version at start of readdir so
452                                  * we can tell if any dentries get dropped */
453                                 dfi->dir_release_count = req->r_dir_release_cnt;
454                                 dfi->dir_ordered_count = req->r_dir_ordered_cnt;
455                         }
456                 } else {
457                         dout("readdir !did_prepopulate\n");
458                         /* disable readdir cache */
459                         dfi->readdir_cache_idx = -1;
460                         /* preclude from marking dir complete */
461                         dfi->dir_release_count = 0;
462                 }
463 
464                 /* note next offset and last dentry name */
465                 if (rinfo->dir_nr > 0) {
466                         struct ceph_mds_reply_dir_entry *rde =
467                                         rinfo->dir_entries + (rinfo->dir_nr-1);
468                         unsigned next_offset = req->r_reply_info.dir_end ?
469                                         2 : (fpos_off(rde->offset) + 1);
470                         err = note_last_dentry(dfi, rde->name, rde->name_len,
471                                                next_offset);
472                         if (err)
473                                 return err;
474                 } else if (req->r_reply_info.dir_end) {
475                         dfi->next_offset = 2;
476                         /* keep last name */
477                 }
478         }
479 
480         rinfo = &dfi->last_readdir->r_reply_info;
481         dout("readdir frag %x num %d pos %llx chunk first %llx\n",
482              dfi->frag, rinfo->dir_nr, ctx->pos,
483              rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL);
484 
485         i = 0;
486         /* search start position */
487         if (rinfo->dir_nr > 0) {
488                 int step, nr = rinfo->dir_nr;
489                 while (nr > 0) {
490                         step = nr >> 1;
491                         if (rinfo->dir_entries[i + step].offset < ctx->pos) {
492                                 i +=  step + 1;
493                                 nr -= step + 1;
494                         } else {
495                                 nr = step;
496                         }
497                 }
498         }
499         for (; i < rinfo->dir_nr; i++) {
500                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
501                 struct ceph_vino vino;
502                 ino_t ino;
503                 u32 ftype;
504 
505                 BUG_ON(rde->offset < ctx->pos);
506 
507                 ctx->pos = rde->offset;
508                 dout("readdir (%d/%d) -> %llx '%.*s' %p\n",
509                      i, rinfo->dir_nr, ctx->pos,
510                      rde->name_len, rde->name, &rde->inode.in);
511 
512                 BUG_ON(!rde->inode.in);
513                 ftype = le32_to_cpu(rde->inode.in->mode) >> 12;
514                 vino.ino = le64_to_cpu(rde->inode.in->ino);
515                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
516                 ino = ceph_vino_to_ino(vino);
517 
518                 if (!dir_emit(ctx, rde->name, rde->name_len,
519                               ceph_translate_ino(inode->i_sb, ino), ftype)) {
520                         dout("filldir stopping us...\n");
521                         return 0;
522                 }
523                 ctx->pos++;
524         }
525 
526         ceph_mdsc_put_request(dfi->last_readdir);
527         dfi->last_readdir = NULL;
528 
529         if (dfi->next_offset > 2) {
530                 frag = dfi->frag;
531                 goto more;
532         }
533 
534         /* more frags? */
535         if (!ceph_frag_is_rightmost(dfi->frag)) {
536                 frag = ceph_frag_next(dfi->frag);
537                 if (is_hash_order(ctx->pos)) {
538                         loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag),
539                                                         dfi->next_offset, true);
540                         if (new_pos > ctx->pos)
541                                 ctx->pos = new_pos;
542                         /* keep last_name */
543                 } else {
544                         ctx->pos = ceph_make_fpos(frag, dfi->next_offset,
545                                                         false);
546                         kfree(dfi->last_name);
547                         dfi->last_name = NULL;
548                 }
549                 dout("readdir next frag is %x\n", frag);
550                 goto more;
551         }
552         dfi->file_info.flags |= CEPH_F_ATEND;
553 
554         /*
555          * if dir_release_count still matches the dir, no dentries
556          * were released during the whole readdir, and we should have
557          * the complete dir contents in our cache.
558          */
559         if (atomic64_read(&ci->i_release_count) ==
560                                         dfi->dir_release_count) {
561                 spin_lock(&ci->i_ceph_lock);
562                 if (dfi->dir_ordered_count ==
563                                 atomic64_read(&ci->i_ordered_count)) {
564                         dout(" marking %p complete and ordered\n", inode);
565                         /* use i_size to track number of entries in
566                          * readdir cache */
567                         BUG_ON(dfi->readdir_cache_idx < 0);
568                         i_size_write(inode, dfi->readdir_cache_idx *
569                                      sizeof(struct dentry*));
570                 } else {
571                         dout(" marking %p complete\n", inode);
572                 }
573                 __ceph_dir_set_complete(ci, dfi->dir_release_count,
574                                         dfi->dir_ordered_count);
575                 spin_unlock(&ci->i_ceph_lock);
576         }
577 
578         dout("readdir %p file %p done.\n", inode, file);
579         return 0;
580 }
581 
582 static void reset_readdir(struct ceph_dir_file_info *dfi)
583 {
584         if (dfi->last_readdir) {
585                 ceph_mdsc_put_request(dfi->last_readdir);
586                 dfi->last_readdir = NULL;
587         }
588         kfree(dfi->last_name);
589         dfi->last_name = NULL;
590         dfi->dir_release_count = 0;
591         dfi->readdir_cache_idx = -1;
592         dfi->next_offset = 2;  /* compensate for . and .. */
593         dfi->file_info.flags &= ~CEPH_F_ATEND;
594 }
595 
596 /*
597  * discard buffered readdir content on seekdir(0), or seek to new frag,
598  * or seek prior to current chunk
599  */
600 static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos)
601 {
602         struct ceph_mds_reply_info_parsed *rinfo;
603         loff_t chunk_offset;
604         if (new_pos == 0)
605                 return true;
606         if (is_hash_order(new_pos)) {
607                 /* no need to reset last_name for a forward seek when
608                  * dentries are sotred in hash order */
609         } else if (dfi->frag != fpos_frag(new_pos)) {
610                 return true;
611         }
612         rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL;
613         if (!rinfo || !rinfo->dir_nr)
614                 return true;
615         chunk_offset = rinfo->dir_entries[0].offset;
616         return new_pos < chunk_offset ||
617                is_hash_order(new_pos) != is_hash_order(chunk_offset);
618 }
619 
620 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
621 {
622         struct ceph_dir_file_info *dfi = file->private_data;
623         struct inode *inode = file->f_mapping->host;
624         loff_t retval;
625 
626         inode_lock(inode);
627         retval = -EINVAL;
628         switch (whence) {
629         case SEEK_CUR:
630                 offset += file->f_pos;
631         case SEEK_SET:
632                 break;
633         case SEEK_END:
634                 retval = -EOPNOTSUPP;
635         default:
636                 goto out;
637         }
638 
639         if (offset >= 0) {
640                 if (need_reset_readdir(dfi, offset)) {
641                         dout("dir_llseek dropping %p content\n", file);
642                         reset_readdir(dfi);
643                 } else if (is_hash_order(offset) && offset > file->f_pos) {
644                         /* for hash offset, we don't know if a forward seek
645                          * is within same frag */
646                         dfi->dir_release_count = 0;
647                         dfi->readdir_cache_idx = -1;
648                 }
649 
650                 if (offset != file->f_pos) {
651                         file->f_pos = offset;
652                         file->f_version = 0;
653                         dfi->file_info.flags &= ~CEPH_F_ATEND;
654                 }
655                 retval = offset;
656         }
657 out:
658         inode_unlock(inode);
659         return retval;
660 }
661 
662 /*
663  * Handle lookups for the hidden .snap directory.
664  */
665 int ceph_handle_snapdir(struct ceph_mds_request *req,
666                         struct dentry *dentry, int err)
667 {
668         struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
669         struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */
670 
671         /* .snap dir? */
672         if (err == -ENOENT &&
673             ceph_snap(parent) == CEPH_NOSNAP &&
674             strcmp(dentry->d_name.name,
675                    fsc->mount_options->snapdir_name) == 0) {
676                 struct inode *inode = ceph_get_snapdir(parent);
677                 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
678                      dentry, dentry, inode);
679                 BUG_ON(!d_unhashed(dentry));
680                 d_add(dentry, inode);
681                 err = 0;
682         }
683         return err;
684 }
685 
686 /*
687  * Figure out final result of a lookup/open request.
688  *
689  * Mainly, make sure we return the final req->r_dentry (if it already
690  * existed) in place of the original VFS-provided dentry when they
691  * differ.
692  *
693  * Gracefully handle the case where the MDS replies with -ENOENT and
694  * no trace (which it may do, at its discretion, e.g., if it doesn't
695  * care to issue a lease on the negative dentry).
696  */
697 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
698                                   struct dentry *dentry, int err)
699 {
700         if (err == -ENOENT) {
701                 /* no trace? */
702                 err = 0;
703                 if (!req->r_reply_info.head->is_dentry) {
704                         dout("ENOENT and no trace, dentry %p inode %p\n",
705                              dentry, d_inode(dentry));
706                         if (d_really_is_positive(dentry)) {
707                                 d_drop(dentry);
708                                 err = -ENOENT;
709                         } else {
710                                 d_add(dentry, NULL);
711                         }
712                 }
713         }
714         if (err)
715                 dentry = ERR_PTR(err);
716         else if (dentry != req->r_dentry)
717                 dentry = dget(req->r_dentry);   /* we got spliced */
718         else
719                 dentry = NULL;
720         return dentry;
721 }
722 
723 static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
724 {
725         return ceph_ino(inode) == CEPH_INO_ROOT &&
726                 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
727 }
728 
729 /*
730  * Look up a single dir entry.  If there is a lookup intent, inform
731  * the MDS so that it gets our 'caps wanted' value in a single op.
732  */
733 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
734                                   unsigned int flags)
735 {
736         struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
737         struct ceph_mds_client *mdsc = fsc->mdsc;
738         struct ceph_mds_request *req;
739         int op;
740         int mask;
741         int err;
742 
743         dout("lookup %p dentry %p '%pd'\n",
744              dir, dentry, dentry);
745 
746         if (dentry->d_name.len > NAME_MAX)
747                 return ERR_PTR(-ENAMETOOLONG);
748 
749         /* can we conclude ENOENT locally? */
750         if (d_really_is_negative(dentry)) {
751                 struct ceph_inode_info *ci = ceph_inode(dir);
752                 struct ceph_dentry_info *di = ceph_dentry(dentry);
753 
754                 spin_lock(&ci->i_ceph_lock);
755                 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
756                 if (strncmp(dentry->d_name.name,
757                             fsc->mount_options->snapdir_name,
758                             dentry->d_name.len) &&
759                     !is_root_ceph_dentry(dir, dentry) &&
760                     ceph_test_mount_opt(fsc, DCACHE) &&
761                     __ceph_dir_is_complete(ci) &&
762                     (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
763                         spin_unlock(&ci->i_ceph_lock);
764                         dout(" dir %p complete, -ENOENT\n", dir);
765                         d_add(dentry, NULL);
766                         di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
767                         return NULL;
768                 }
769                 spin_unlock(&ci->i_ceph_lock);
770         }
771 
772         op = ceph_snap(dir) == CEPH_SNAPDIR ?
773                 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
774         req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
775         if (IS_ERR(req))
776                 return ERR_CAST(req);
777         req->r_dentry = dget(dentry);
778         req->r_num_caps = 2;
779 
780         mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
781         if (ceph_security_xattr_wanted(dir))
782                 mask |= CEPH_CAP_XATTR_SHARED;
783         req->r_args.getattr.mask = cpu_to_le32(mask);
784 
785         req->r_parent = dir;
786         set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
787         err = ceph_mdsc_do_request(mdsc, NULL, req);
788         err = ceph_handle_snapdir(req, dentry, err);
789         dentry = ceph_finish_lookup(req, dentry, err);
790         ceph_mdsc_put_request(req);  /* will dput(dentry) */
791         dout("lookup result=%p\n", dentry);
792         return dentry;
793 }
794 
795 /*
796  * If we do a create but get no trace back from the MDS, follow up with
797  * a lookup (the VFS expects us to link up the provided dentry).
798  */
799 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
800 {
801         struct dentry *result = ceph_lookup(dir, dentry, 0);
802 
803         if (result && !IS_ERR(result)) {
804                 /*
805                  * We created the item, then did a lookup, and found
806                  * it was already linked to another inode we already
807                  * had in our cache (and thus got spliced). To not
808                  * confuse VFS (especially when inode is a directory),
809                  * we don't link our dentry to that inode, return an
810                  * error instead.
811                  *
812                  * This event should be rare and it happens only when
813                  * we talk to old MDS. Recent MDS does not send traceless
814                  * reply for request that creates new inode.
815                  */
816                 d_drop(result);
817                 return -ESTALE;
818         }
819         return PTR_ERR(result);
820 }
821 
822 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
823                       umode_t mode, dev_t rdev)
824 {
825         struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
826         struct ceph_mds_client *mdsc = fsc->mdsc;
827         struct ceph_mds_request *req;
828         struct ceph_acls_info acls = {};
829         int err;
830 
831         if (ceph_snap(dir) != CEPH_NOSNAP)
832                 return -EROFS;
833 
834         if (ceph_quota_is_max_files_exceeded(dir)) {
835                 err = -EDQUOT;
836                 goto out;
837         }
838 
839         err = ceph_pre_init_acls(dir, &mode, &acls);
840         if (err < 0)
841                 goto out;
842 
843         dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
844              dir, dentry, mode, rdev);
845         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
846         if (IS_ERR(req)) {
847                 err = PTR_ERR(req);
848                 goto out;
849         }
850         req->r_dentry = dget(dentry);
851         req->r_num_caps = 2;
852         req->r_parent = dir;
853         set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
854         req->r_args.mknod.mode = cpu_to_le32(mode);
855         req->r_args.mknod.rdev = cpu_to_le32(rdev);
856         req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
857         req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
858         if (acls.pagelist) {
859                 req->r_pagelist = acls.pagelist;
860                 acls.pagelist = NULL;
861         }
862         err = ceph_mdsc_do_request(mdsc, dir, req);
863         if (!err && !req->r_reply_info.head->is_dentry)
864                 err = ceph_handle_notrace_create(dir, dentry);
865         ceph_mdsc_put_request(req);
866 out:
867         if (!err)
868                 ceph_init_inode_acls(d_inode(dentry), &acls);
869         else
870                 d_drop(dentry);
871         ceph_release_acls_info(&acls);
872         return err;
873 }
874 
875 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
876                        bool excl)
877 {
878         return ceph_mknod(dir, dentry, mode, 0);
879 }
880 
881 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
882                             const char *dest)
883 {
884         struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
885         struct ceph_mds_client *mdsc = fsc->mdsc;
886         struct ceph_mds_request *req;
887         int err;
888 
889         if (ceph_snap(dir) != CEPH_NOSNAP)
890                 return -EROFS;
891 
892         if (ceph_quota_is_max_files_exceeded(dir)) {
893                 err = -EDQUOT;
894                 goto out;
895         }
896 
897         dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
898         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
899         if (IS_ERR(req)) {
900                 err = PTR_ERR(req);
901                 goto out;
902         }
903         req->r_path2 = kstrdup(dest, GFP_KERNEL);
904         if (!req->r_path2) {
905                 err = -ENOMEM;
906                 ceph_mdsc_put_request(req);
907                 goto out;
908         }
909         req->r_parent = dir;
910         set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
911         req->r_dentry = dget(dentry);
912         req->r_num_caps = 2;
913         req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
914         req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
915         err = ceph_mdsc_do_request(mdsc, dir, req);
916         if (!err && !req->r_reply_info.head->is_dentry)
917                 err = ceph_handle_notrace_create(dir, dentry);
918         ceph_mdsc_put_request(req);
919 out:
920         if (err)
921                 d_drop(dentry);
922         return err;
923 }
924 
925 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
926 {
927         struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
928         struct ceph_mds_client *mdsc = fsc->mdsc;
929         struct ceph_mds_request *req;
930         struct ceph_acls_info acls = {};
931         int err = -EROFS;
932         int op;
933 
934         if (ceph_snap(dir) == CEPH_SNAPDIR) {
935                 /* mkdir .snap/foo is a MKSNAP */
936                 op = CEPH_MDS_OP_MKSNAP;
937                 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
938                      dentry, dentry);
939         } else if (ceph_snap(dir) == CEPH_NOSNAP) {
940                 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
941                 op = CEPH_MDS_OP_MKDIR;
942         } else {
943                 goto out;
944         }
945 
946         if (op == CEPH_MDS_OP_MKDIR &&
947             ceph_quota_is_max_files_exceeded(dir)) {
948                 err = -EDQUOT;
949                 goto out;
950         }
951 
952         mode |= S_IFDIR;
953         err = ceph_pre_init_acls(dir, &mode, &acls);
954         if (err < 0)
955                 goto out;
956 
957         req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
958         if (IS_ERR(req)) {
959                 err = PTR_ERR(req);
960                 goto out;
961         }
962 
963         req->r_dentry = dget(dentry);
964         req->r_num_caps = 2;
965         req->r_parent = dir;
966         set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
967         req->r_args.mkdir.mode = cpu_to_le32(mode);
968         req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
969         req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
970         if (acls.pagelist) {
971                 req->r_pagelist = acls.pagelist;
972                 acls.pagelist = NULL;
973         }
974         err = ceph_mdsc_do_request(mdsc, dir, req);
975         if (!err &&
976             !req->r_reply_info.head->is_target &&
977             !req->r_reply_info.head->is_dentry)
978                 err = ceph_handle_notrace_create(dir, dentry);
979         ceph_mdsc_put_request(req);
980 out:
981         if (!err)
982                 ceph_init_inode_acls(d_inode(dentry), &acls);
983         else
984                 d_drop(dentry);
985         ceph_release_acls_info(&acls);
986         return err;
987 }
988 
989 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
990                      struct dentry *dentry)
991 {
992         struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
993         struct ceph_mds_client *mdsc = fsc->mdsc;
994         struct ceph_mds_request *req;
995         int err;
996 
997         if (ceph_snap(dir) != CEPH_NOSNAP)
998                 return -EROFS;
999 
1000         dout("link in dir %p old_dentry %p dentry %p\n", dir,
1001              old_dentry, dentry);
1002         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
1003         if (IS_ERR(req)) {
1004                 d_drop(dentry);
1005                 return PTR_ERR(req);
1006         }
1007         req->r_dentry = dget(dentry);
1008         req->r_num_caps = 2;
1009         req->r_old_dentry = dget(old_dentry);
1010         req->r_parent = dir;
1011         set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1012         req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1013         req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1014         /* release LINK_SHARED on source inode (mds will lock it) */
1015         req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1016         err = ceph_mdsc_do_request(mdsc, dir, req);
1017         if (err) {
1018                 d_drop(dentry);
1019         } else if (!req->r_reply_info.head->is_dentry) {
1020                 ihold(d_inode(old_dentry));
1021                 d_instantiate(dentry, d_inode(old_dentry));
1022         }
1023         ceph_mdsc_put_request(req);
1024         return err;
1025 }
1026 
1027 /*
1028  * rmdir and unlink are differ only by the metadata op code
1029  */
1030 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
1031 {
1032         struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
1033         struct ceph_mds_client *mdsc = fsc->mdsc;
1034         struct inode *inode = d_inode(dentry);
1035         struct ceph_mds_request *req;
1036         int err = -EROFS;
1037         int op;
1038 
1039         if (ceph_snap(dir) == CEPH_SNAPDIR) {
1040                 /* rmdir .snap/foo is RMSNAP */
1041                 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
1042                 op = CEPH_MDS_OP_RMSNAP;
1043         } else if (ceph_snap(dir) == CEPH_NOSNAP) {
1044                 dout("unlink/rmdir dir %p dn %p inode %p\n",
1045                      dir, dentry, inode);
1046                 op = d_is_dir(dentry) ?
1047                         CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
1048         } else
1049                 goto out;
1050         req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1051         if (IS_ERR(req)) {
1052                 err = PTR_ERR(req);
1053                 goto out;
1054         }
1055         req->r_dentry = dget(dentry);
1056         req->r_num_caps = 2;
1057         req->r_parent = dir;
1058         set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1059         req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1060         req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1061         req->r_inode_drop = ceph_drop_caps_for_unlink(inode);
1062         err = ceph_mdsc_do_request(mdsc, dir, req);
1063         if (!err && !req->r_reply_info.head->is_dentry)
1064                 d_delete(dentry);
1065         ceph_mdsc_put_request(req);
1066 out:
1067         return err;
1068 }
1069 
1070 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
1071                        struct inode *new_dir, struct dentry *new_dentry,
1072                        unsigned int flags)
1073 {
1074         struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
1075         struct ceph_mds_client *mdsc = fsc->mdsc;
1076         struct ceph_mds_request *req;
1077         int op = CEPH_MDS_OP_RENAME;
1078         int err;
1079 
1080         if (flags)
1081                 return -EINVAL;
1082 
1083         if (ceph_snap(old_dir) != ceph_snap(new_dir))
1084                 return -EXDEV;
1085         if (ceph_snap(old_dir) != CEPH_NOSNAP) {
1086                 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
1087                         op = CEPH_MDS_OP_RENAMESNAP;
1088                 else
1089                         return -EROFS;
1090         }
1091         /* don't allow cross-quota renames */
1092         if ((old_dir != new_dir) &&
1093             (!ceph_quota_is_same_realm(old_dir, new_dir)))
1094                 return -EXDEV;
1095 
1096         dout("rename dir %p dentry %p to dir %p dentry %p\n",
1097              old_dir, old_dentry, new_dir, new_dentry);
1098         req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1099         if (IS_ERR(req))
1100                 return PTR_ERR(req);
1101         ihold(old_dir);
1102         req->r_dentry = dget(new_dentry);
1103         req->r_num_caps = 2;
1104         req->r_old_dentry = dget(old_dentry);
1105         req->r_old_dentry_dir = old_dir;
1106         req->r_parent = new_dir;
1107         set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1108         req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
1109         req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
1110         req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1111         req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1112         /* release LINK_RDCACHE on source inode (mds will lock it) */
1113         req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1114         if (d_really_is_positive(new_dentry)) {
1115                 req->r_inode_drop =
1116                         ceph_drop_caps_for_unlink(d_inode(new_dentry));
1117         }
1118         err = ceph_mdsc_do_request(mdsc, old_dir, req);
1119         if (!err && !req->r_reply_info.head->is_dentry) {
1120                 /*
1121                  * Normally d_move() is done by fill_trace (called by
1122                  * do_request, above).  If there is no trace, we need
1123                  * to do it here.
1124                  */
1125                 d_move(old_dentry, new_dentry);
1126         }
1127         ceph_mdsc_put_request(req);
1128         return err;
1129 }
1130 
1131 /*
1132  * Move dentry to tail of mdsc->dentry_leases list when lease is updated.
1133  * Leases at front of the list will expire first. (Assume all leases have
1134  * similar duration)
1135  *
1136  * Called under dentry->d_lock.
1137  */
1138 void __ceph_dentry_lease_touch(struct ceph_dentry_info *di)
1139 {
1140         struct dentry *dn = di->dentry;
1141         struct ceph_mds_client *mdsc;
1142 
1143         dout("dentry_lease_touch %p %p '%pd'\n", di, dn, dn);
1144 
1145         di->flags |= CEPH_DENTRY_LEASE_LIST;
1146         if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
1147                 di->flags |= CEPH_DENTRY_REFERENCED;
1148                 return;
1149         }
1150 
1151         mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1152         spin_lock(&mdsc->dentry_list_lock);
1153         list_move_tail(&di->lease_list, &mdsc->dentry_leases);
1154         spin_unlock(&mdsc->dentry_list_lock);
1155 }
1156 
1157 static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc,
1158                                      struct ceph_dentry_info *di)
1159 {
1160         di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED);
1161         di->lease_gen = 0;
1162         di->time = jiffies;
1163         list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases);
1164 }
1165 
1166 /*
1167  * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases
1168  * list if it's not in the list, otherwise set 'referenced' flag.
1169  *
1170  * Called under dentry->d_lock.
1171  */
1172 void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di)
1173 {
1174         struct dentry *dn = di->dentry;
1175         struct ceph_mds_client *mdsc;
1176 
1177         dout("dentry_dir_lease_touch %p %p '%pd' (offset %lld)\n",
1178              di, dn, dn, di->offset);
1179 
1180         if (!list_empty(&di->lease_list)) {
1181                 if (di->flags & CEPH_DENTRY_LEASE_LIST) {
1182                         /* don't remove dentry from dentry lease list
1183                          * if its lease is valid */
1184                         if (__dentry_lease_is_valid(di))
1185                                 return;
1186                 } else {
1187                         di->flags |= CEPH_DENTRY_REFERENCED;
1188                         return;
1189                 }
1190         }
1191 
1192         if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
1193                 di->flags |= CEPH_DENTRY_REFERENCED;
1194                 di->flags &= ~CEPH_DENTRY_LEASE_LIST;
1195                 return;
1196         }
1197 
1198         mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1199         spin_lock(&mdsc->dentry_list_lock);
1200         __dentry_dir_lease_touch(mdsc, di),
1201         spin_unlock(&mdsc->dentry_list_lock);
1202 }
1203 
1204 static void __dentry_lease_unlist(struct ceph_dentry_info *di)
1205 {
1206         struct ceph_mds_client *mdsc;
1207         if (di->flags & CEPH_DENTRY_SHRINK_LIST)
1208                 return;
1209         if (list_empty(&di->lease_list))
1210                 return;
1211 
1212         mdsc = ceph_sb_to_client(di->dentry->d_sb)->mdsc;
1213         spin_lock(&mdsc->dentry_list_lock);
1214         list_del_init(&di->lease_list);
1215         spin_unlock(&mdsc->dentry_list_lock);
1216 }
1217 
1218 enum {
1219         KEEP    = 0,
1220         DELETE  = 1,
1221         TOUCH   = 2,
1222         STOP    = 4,
1223 };
1224 
1225 struct ceph_lease_walk_control {
1226         bool dir_lease;
1227         bool expire_dir_lease;
1228         unsigned long nr_to_scan;
1229         unsigned long dir_lease_ttl;
1230 };
1231 
1232 static unsigned long
1233 __dentry_leases_walk(struct ceph_mds_client *mdsc,
1234                      struct ceph_lease_walk_control *lwc,
1235                      int (*check)(struct dentry*, void*))
1236 {
1237         struct ceph_dentry_info *di, *tmp;
1238         struct dentry *dentry, *last = NULL;
1239         struct list_head* list;
1240         LIST_HEAD(dispose);
1241         unsigned long freed = 0;
1242         int ret = 0;
1243 
1244         list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases;
1245         spin_lock(&mdsc->dentry_list_lock);
1246         list_for_each_entry_safe(di, tmp, list, lease_list) {
1247                 if (!lwc->nr_to_scan)
1248                         break;
1249                 --lwc->nr_to_scan;
1250 
1251                 dentry = di->dentry;
1252                 if (last == dentry)
1253                         break;
1254 
1255                 if (!spin_trylock(&dentry->d_lock))
1256                         continue;
1257 
1258                 if (dentry->d_lockref.count < 0) {
1259                         list_del_init(&di->lease_list);
1260                         goto next;
1261                 }
1262 
1263                 ret = check(dentry, lwc);
1264                 if (ret & TOUCH) {
1265                         /* move it into tail of dir lease list */
1266                         __dentry_dir_lease_touch(mdsc, di);
1267                         if (!last)
1268                                 last = dentry;
1269                 }
1270                 if (ret & DELETE) {
1271                         /* stale lease */
1272                         di->flags &= ~CEPH_DENTRY_REFERENCED;
1273                         if (dentry->d_lockref.count > 0) {
1274                                 /* update_dentry_lease() will re-add
1275                                  * it to lease list, or
1276                                  * ceph_d_delete() will return 1 when
1277                                  * last reference is dropped */
1278                                 list_del_init(&di->lease_list);
1279                         } else {
1280                                 di->flags |= CEPH_DENTRY_SHRINK_LIST;
1281                                 list_move_tail(&di->lease_list, &dispose);
1282                                 dget_dlock(dentry);
1283                         }
1284                 }
1285 next:
1286                 spin_unlock(&dentry->d_lock);
1287                 if (ret & STOP)
1288                         break;
1289         }
1290         spin_unlock(&mdsc->dentry_list_lock);
1291 
1292         while (!list_empty(&dispose)) {
1293                 di = list_first_entry(&dispose, struct ceph_dentry_info,
1294                                       lease_list);
1295                 dentry = di->dentry;
1296                 spin_lock(&dentry->d_lock);
1297 
1298                 list_del_init(&di->lease_list);
1299                 di->flags &= ~CEPH_DENTRY_SHRINK_LIST;
1300                 if (di->flags & CEPH_DENTRY_REFERENCED) {
1301                         spin_lock(&mdsc->dentry_list_lock);
1302                         if (di->flags & CEPH_DENTRY_LEASE_LIST) {
1303                                 list_add_tail(&di->lease_list,
1304                                               &mdsc->dentry_leases);
1305                         } else {
1306                                 __dentry_dir_lease_touch(mdsc, di);
1307                         }
1308                         spin_unlock(&mdsc->dentry_list_lock);
1309                 } else {
1310                         freed++;
1311                 }
1312 
1313                 spin_unlock(&dentry->d_lock);
1314                 /* ceph_d_delete() does the trick */
1315                 dput(dentry);
1316         }
1317         return freed;
1318 }
1319 
1320 static int __dentry_lease_check(struct dentry *dentry, void *arg)
1321 {
1322         struct ceph_dentry_info *di = ceph_dentry(dentry);
1323         int ret;
1324 
1325         if (__dentry_lease_is_valid(di))
1326                 return STOP;
1327         ret = __dir_lease_try_check(dentry);
1328         if (ret == -EBUSY)
1329                 return KEEP;
1330         if (ret > 0)
1331                 return TOUCH;
1332         return DELETE;
1333 }
1334 
1335 static int __dir_lease_check(struct dentry *dentry, void *arg)
1336 {
1337         struct ceph_lease_walk_control *lwc = arg;
1338         struct ceph_dentry_info *di = ceph_dentry(dentry);
1339 
1340         int ret = __dir_lease_try_check(dentry);
1341         if (ret == -EBUSY)
1342                 return KEEP;
1343         if (ret > 0) {
1344                 if (time_before(jiffies, di->time + lwc->dir_lease_ttl))
1345                         return STOP;
1346                 /* Move dentry to tail of dir lease list if we don't want
1347                  * to delete it. So dentries in the list are checked in a
1348                  * round robin manner */
1349                 if (!lwc->expire_dir_lease)
1350                         return TOUCH;
1351                 if (dentry->d_lockref.count > 0 ||
1352                     (di->flags & CEPH_DENTRY_REFERENCED))
1353                         return TOUCH;
1354                 /* invalidate dir lease */
1355                 di->lease_shared_gen = 0;
1356         }
1357         return DELETE;
1358 }
1359 
1360 int ceph_trim_dentries(struct ceph_mds_client *mdsc)
1361 {
1362         struct ceph_lease_walk_control lwc;
1363         unsigned long count;
1364         unsigned long freed;
1365 
1366         spin_lock(&mdsc->caps_list_lock);
1367         if (mdsc->caps_use_max > 0 &&
1368             mdsc->caps_use_count > mdsc->caps_use_max)
1369                 count = mdsc->caps_use_count - mdsc->caps_use_max;
1370         else
1371                 count = 0;
1372         spin_unlock(&mdsc->caps_list_lock);
1373 
1374         lwc.dir_lease = false;
1375         lwc.nr_to_scan  = CEPH_CAPS_PER_RELEASE * 2;
1376         freed = __dentry_leases_walk(mdsc, &lwc, __dentry_lease_check);
1377         if (!lwc.nr_to_scan) /* more invalid leases */
1378                 return -EAGAIN;
1379 
1380         if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE)
1381                 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE;
1382 
1383         lwc.dir_lease = true;
1384         lwc.expire_dir_lease = freed < count;
1385         lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ;
1386         freed +=__dentry_leases_walk(mdsc, &lwc, __dir_lease_check);
1387         if (!lwc.nr_to_scan) /* more to check */
1388                 return -EAGAIN;
1389 
1390         return freed > 0 ? 1 : 0;
1391 }
1392 
1393 /*
1394  * Ensure a dentry lease will no longer revalidate.
1395  */
1396 void ceph_invalidate_dentry_lease(struct dentry *dentry)
1397 {
1398         struct ceph_dentry_info *di = ceph_dentry(dentry);
1399         spin_lock(&dentry->d_lock);
1400         di->time = jiffies;
1401         di->lease_shared_gen = 0;
1402         __dentry_lease_unlist(di);
1403         spin_unlock(&dentry->d_lock);
1404 }
1405 
1406 /*
1407  * Check if dentry lease is valid.  If not, delete the lease.  Try to
1408  * renew if the least is more than half up.
1409  */
1410 static bool __dentry_lease_is_valid(struct ceph_dentry_info *di)
1411 {
1412         struct ceph_mds_session *session;
1413 
1414         if (!di->lease_gen)
1415                 return false;
1416 
1417         session = di->lease_session;
1418         if (session) {
1419                 u32 gen;
1420                 unsigned long ttl;
1421 
1422                 spin_lock(&session->s_gen_ttl_lock);
1423                 gen = session->s_cap_gen;
1424                 ttl = session->s_cap_ttl;
1425                 spin_unlock(&session->s_gen_ttl_lock);
1426 
1427                 if (di->lease_gen == gen &&
1428                     time_before(jiffies, ttl) &&
1429                     time_before(jiffies, di->time))
1430                         return true;
1431         }
1432         di->lease_gen = 0;
1433         return false;
1434 }
1435 
1436 static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags,
1437                                  struct inode *dir)
1438 {
1439         struct ceph_dentry_info *di;
1440         struct ceph_mds_session *session = NULL;
1441         u32 seq = 0;
1442         int valid = 0;
1443 
1444         spin_lock(&dentry->d_lock);
1445         di = ceph_dentry(dentry);
1446         if (di && __dentry_lease_is_valid(di)) {
1447                 valid = 1;
1448 
1449                 if (di->lease_renew_after &&
1450                     time_after(jiffies, di->lease_renew_after)) {
1451                         /*
1452                          * We should renew. If we're in RCU walk mode
1453                          * though, we can't do that so just return
1454                          * -ECHILD.
1455                          */
1456                         if (flags & LOOKUP_RCU) {
1457                                 valid = -ECHILD;
1458                         } else {
1459                                 session = ceph_get_mds_session(di->lease_session);
1460                                 seq = di->lease_seq;
1461                                 di->lease_renew_after = 0;
1462                                 di->lease_renew_from = jiffies;
1463                         }
1464                 }
1465         }
1466         spin_unlock(&dentry->d_lock);
1467 
1468         if (session) {
1469                 ceph_mdsc_lease_send_msg(session, dir, dentry,
1470                                          CEPH_MDS_LEASE_RENEW, seq);
1471                 ceph_put_mds_session(session);
1472         }
1473         dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1474         return valid;
1475 }
1476 
1477 /*
1478  * Called under dentry->d_lock.
1479  */
1480 static int __dir_lease_try_check(const struct dentry *dentry)
1481 {
1482         struct ceph_dentry_info *di = ceph_dentry(dentry);
1483         struct inode *dir;
1484         struct ceph_inode_info *ci;
1485         int valid = 0;
1486 
1487         if (!di->lease_shared_gen)
1488                 return 0;
1489         if (IS_ROOT(dentry))
1490                 return 0;
1491 
1492         dir = d_inode(dentry->d_parent);
1493         ci = ceph_inode(dir);
1494 
1495         if (spin_trylock(&ci->i_ceph_lock)) {
1496                 if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen &&
1497                     __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0))
1498                         valid = 1;
1499                 spin_unlock(&ci->i_ceph_lock);
1500         } else {
1501                 valid = -EBUSY;
1502         }
1503 
1504         if (!valid)
1505                 di->lease_shared_gen = 0;
1506         return valid;
1507 }
1508 
1509 /*
1510  * Check if directory-wide content lease/cap is valid.
1511  */
1512 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1513 {
1514         struct ceph_inode_info *ci = ceph_inode(dir);
1515         struct ceph_dentry_info *di = ceph_dentry(dentry);
1516         int valid = 0;
1517 
1518         spin_lock(&ci->i_ceph_lock);
1519         if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen)
1520                 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1521         spin_unlock(&ci->i_ceph_lock);
1522         if (valid)
1523                 __ceph_dentry_dir_lease_touch(di);
1524         dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1525              dir, (unsigned)atomic_read(&ci->i_shared_gen),
1526              dentry, (unsigned)di->lease_shared_gen, valid);
1527         return valid;
1528 }
1529 
1530 /*
1531  * Check if cached dentry can be trusted.
1532  */
1533 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1534 {
1535         int valid = 0;
1536         struct dentry *parent;
1537         struct inode *dir;
1538 
1539         if (flags & LOOKUP_RCU) {
1540                 parent = READ_ONCE(dentry->d_parent);
1541                 dir = d_inode_rcu(parent);
1542                 if (!dir)
1543                         return -ECHILD;
1544         } else {
1545                 parent = dget_parent(dentry);
1546                 dir = d_inode(parent);
1547         }
1548 
1549         dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry,
1550              dentry, d_inode(dentry), ceph_dentry(dentry)->offset);
1551 
1552         /* always trust cached snapped dentries, snapdir dentry */
1553         if (ceph_snap(dir) != CEPH_NOSNAP) {
1554                 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1555                      dentry, d_inode(dentry));
1556                 valid = 1;
1557         } else if (d_really_is_positive(dentry) &&
1558                    ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) {
1559                 valid = 1;
1560         } else {
1561                 valid = dentry_lease_is_valid(dentry, flags, dir);
1562                 if (valid == -ECHILD)
1563                         return valid;
1564                 if (valid || dir_lease_is_valid(dir, dentry)) {
1565                         if (d_really_is_positive(dentry))
1566                                 valid = ceph_is_any_caps(d_inode(dentry));
1567                         else
1568                                 valid = 1;
1569                 }
1570         }
1571 
1572         if (!valid) {
1573                 struct ceph_mds_client *mdsc =
1574                         ceph_sb_to_client(dir->i_sb)->mdsc;
1575                 struct ceph_mds_request *req;
1576                 int op, err;
1577                 u32 mask;
1578 
1579                 if (flags & LOOKUP_RCU)
1580                         return -ECHILD;
1581 
1582                 op = ceph_snap(dir) == CEPH_SNAPDIR ?
1583                         CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
1584                 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
1585                 if (!IS_ERR(req)) {
1586                         req->r_dentry = dget(dentry);
1587                         req->r_num_caps = 2;
1588                         req->r_parent = dir;
1589 
1590                         mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
1591                         if (ceph_security_xattr_wanted(dir))
1592                                 mask |= CEPH_CAP_XATTR_SHARED;
1593                         req->r_args.getattr.mask = cpu_to_le32(mask);
1594 
1595                         err = ceph_mdsc_do_request(mdsc, NULL, req);
1596                         switch (err) {
1597                         case 0:
1598                                 if (d_really_is_positive(dentry) &&
1599                                     d_inode(dentry) == req->r_target_inode)
1600                                         valid = 1;
1601                                 break;
1602                         case -ENOENT:
1603                                 if (d_really_is_negative(dentry))
1604                                         valid = 1;
1605                                 /* Fallthrough */
1606                         default:
1607                                 break;
1608                         }
1609                         ceph_mdsc_put_request(req);
1610                         dout("d_revalidate %p lookup result=%d\n",
1611                              dentry, err);
1612                 }
1613         }
1614 
1615         dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1616         if (!valid)
1617                 ceph_dir_clear_complete(dir);
1618 
1619         if (!(flags & LOOKUP_RCU))
1620                 dput(parent);
1621         return valid;
1622 }
1623 
1624 /*
1625  * Delete unused dentry that doesn't have valid lease
1626  *
1627  * Called under dentry->d_lock.
1628  */
1629 static int ceph_d_delete(const struct dentry *dentry)
1630 {
1631         struct ceph_dentry_info *di;
1632 
1633         /* won't release caps */
1634         if (d_really_is_negative(dentry))
1635                 return 0;
1636         if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
1637                 return 0;
1638         /* vaild lease? */
1639         di = ceph_dentry(dentry);
1640         if (di) {
1641                 if (__dentry_lease_is_valid(di))
1642                         return 0;
1643                 if (__dir_lease_try_check(dentry))
1644                         return 0;
1645         }
1646         return 1;
1647 }
1648 
1649 /*
1650  * Release our ceph_dentry_info.
1651  */
1652 static void ceph_d_release(struct dentry *dentry)
1653 {
1654         struct ceph_dentry_info *di = ceph_dentry(dentry);
1655 
1656         dout("d_release %p\n", dentry);
1657 
1658         spin_lock(&dentry->d_lock);
1659         __dentry_lease_unlist(di);
1660         dentry->d_fsdata = NULL;
1661         spin_unlock(&dentry->d_lock);
1662 
1663         if (di->lease_session)
1664                 ceph_put_mds_session(di->lease_session);
1665         kmem_cache_free(ceph_dentry_cachep, di);
1666 }
1667 
1668 /*
1669  * When the VFS prunes a dentry from the cache, we need to clear the
1670  * complete flag on the parent directory.
1671  *
1672  * Called under dentry->d_lock.
1673  */
1674 static void ceph_d_prune(struct dentry *dentry)
1675 {
1676         struct ceph_inode_info *dir_ci;
1677         struct ceph_dentry_info *di;
1678 
1679         dout("ceph_d_prune %pd %p\n", dentry, dentry);
1680 
1681         /* do we have a valid parent? */
1682         if (IS_ROOT(dentry))
1683                 return;
1684 
1685         /* we hold d_lock, so d_parent is stable */
1686         dir_ci = ceph_inode(d_inode(dentry->d_parent));
1687         if (dir_ci->i_vino.snap == CEPH_SNAPDIR)
1688                 return;
1689 
1690         /* who calls d_delete() should also disable dcache readdir */
1691         if (d_really_is_negative(dentry))
1692                 return;
1693 
1694         /* d_fsdata does not get cleared until d_release */
1695         if (!d_unhashed(dentry)) {
1696                 __ceph_dir_clear_complete(dir_ci);
1697                 return;
1698         }
1699 
1700         /* Disable dcache readdir just in case that someone called d_drop()
1701          * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED
1702          * properly (dcache readdir is still enabled) */
1703         di = ceph_dentry(dentry);
1704         if (di->offset > 0 &&
1705             di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen))
1706                 __ceph_dir_clear_ordered(dir_ci);
1707 }
1708 
1709 /*
1710  * read() on a dir.  This weird interface hack only works if mounted
1711  * with '-o dirstat'.
1712  */
1713 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1714                              loff_t *ppos)
1715 {
1716         struct ceph_dir_file_info *dfi = file->private_data;
1717         struct inode *inode = file_inode(file);
1718         struct ceph_inode_info *ci = ceph_inode(inode);
1719         int left;
1720         const int bufsize = 1024;
1721 
1722         if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1723                 return -EISDIR;
1724 
1725         if (!dfi->dir_info) {
1726                 dfi->dir_info = kmalloc(bufsize, GFP_KERNEL);
1727                 if (!dfi->dir_info)
1728                         return -ENOMEM;
1729                 dfi->dir_info_len =
1730                         snprintf(dfi->dir_info, bufsize,
1731                                 "entries:   %20lld\n"
1732                                 " files:    %20lld\n"
1733                                 " subdirs:  %20lld\n"
1734                                 "rentries:  %20lld\n"
1735                                 " rfiles:   %20lld\n"
1736                                 " rsubdirs: %20lld\n"
1737                                 "rbytes:    %20lld\n"
1738                                 "rctime:    %10lld.%09ld\n",
1739                                 ci->i_files + ci->i_subdirs,
1740                                 ci->i_files,
1741                                 ci->i_subdirs,
1742                                 ci->i_rfiles + ci->i_rsubdirs,
1743                                 ci->i_rfiles,
1744                                 ci->i_rsubdirs,
1745                                 ci->i_rbytes,
1746                                 ci->i_rctime.tv_sec,
1747                                 ci->i_rctime.tv_nsec);
1748         }
1749 
1750         if (*ppos >= dfi->dir_info_len)
1751                 return 0;
1752         size = min_t(unsigned, size, dfi->dir_info_len-*ppos);
1753         left = copy_to_user(buf, dfi->dir_info + *ppos, size);
1754         if (left == size)
1755                 return -EFAULT;
1756         *ppos += (size - left);
1757         return size - left;
1758 }
1759 
1760 
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 
1771         switch (dci->i_dir_layout.dl_dir_hash) {
1772         case 0: /* for backward compat */
1773         case CEPH_STR_HASH_LINUX:
1774                 return dn->d_name.hash;
1775 
1776         default:
1777                 spin_lock(&dn->d_lock);
1778                 hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1779                                      dn->d_name.name, dn->d_name.len);
1780                 spin_unlock(&dn->d_lock);
1781                 return hash;
1782         }
1783 }
1784 
1785 const struct file_operations ceph_dir_fops = {
1786         .read = ceph_read_dir,
1787         .iterate = ceph_readdir,
1788         .llseek = ceph_dir_llseek,
1789         .open = ceph_open,
1790         .release = ceph_release,
1791         .unlocked_ioctl = ceph_ioctl,
1792         .fsync = ceph_fsync,
1793         .lock = ceph_lock,
1794         .flock = ceph_flock,
1795 };
1796 
1797 const struct file_operations ceph_snapdir_fops = {
1798         .iterate = ceph_readdir,
1799         .llseek = ceph_dir_llseek,
1800         .open = ceph_open,
1801         .release = ceph_release,
1802 };
1803 
1804 const struct inode_operations ceph_dir_iops = {
1805         .lookup = ceph_lookup,
1806         .permission = ceph_permission,
1807         .getattr = ceph_getattr,
1808         .setattr = ceph_setattr,
1809         .listxattr = ceph_listxattr,
1810         .get_acl = ceph_get_acl,
1811         .set_acl = ceph_set_acl,
1812         .mknod = ceph_mknod,
1813         .symlink = ceph_symlink,
1814         .mkdir = ceph_mkdir,
1815         .link = ceph_link,
1816         .unlink = ceph_unlink,
1817         .rmdir = ceph_unlink,
1818         .rename = ceph_rename,
1819         .create = ceph_create,
1820         .atomic_open = ceph_atomic_open,
1821 };
1822 
1823 const struct inode_operations ceph_snapdir_iops = {
1824         .lookup = ceph_lookup,
1825         .permission = ceph_permission,
1826         .getattr = ceph_getattr,
1827         .mkdir = ceph_mkdir,
1828         .rmdir = ceph_unlink,
1829         .rename = ceph_rename,
1830 };
1831 
1832 const struct dentry_operations ceph_dentry_ops = {
1833         .d_revalidate = ceph_d_revalidate,
1834         .d_delete = ceph_d_delete,
1835         .d_release = ceph_d_release,
1836         .d_prune = ceph_d_prune,
1837         .d_init = ceph_d_init,
1838 };
1839 

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