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

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  1 #include <linux/ceph/ceph_debug.h>
  2 
  3 #include <linux/module.h>
  4 #include <linux/fs.h>
  5 #include <linux/slab.h>
  6 #include <linux/string.h>
  7 #include <linux/uaccess.h>
  8 #include <linux/kernel.h>
  9 #include <linux/writeback.h>
 10 #include <linux/vmalloc.h>
 11 #include <linux/posix_acl.h>
 12 #include <linux/random.h>
 13 
 14 #include "super.h"
 15 #include "mds_client.h"
 16 #include "cache.h"
 17 #include <linux/ceph/decode.h>
 18 
 19 /*
 20  * Ceph inode operations
 21  *
 22  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
 23  * setattr, etc.), xattr helpers, and helpers for assimilating
 24  * metadata returned by the MDS into our cache.
 25  *
 26  * Also define helpers for doing asynchronous writeback, invalidation,
 27  * and truncation for the benefit of those who can't afford to block
 28  * (typically because they are in the message handler path).
 29  */
 30 
 31 static const struct inode_operations ceph_symlink_iops;
 32 
 33 static void ceph_invalidate_work(struct work_struct *work);
 34 static void ceph_writeback_work(struct work_struct *work);
 35 static void ceph_vmtruncate_work(struct work_struct *work);
 36 
 37 /*
 38  * find or create an inode, given the ceph ino number
 39  */
 40 static int ceph_set_ino_cb(struct inode *inode, void *data)
 41 {
 42         ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
 43         inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
 44         return 0;
 45 }
 46 
 47 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
 48 {
 49         struct inode *inode;
 50         ino_t t = ceph_vino_to_ino(vino);
 51 
 52         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
 53         if (inode == NULL)
 54                 return ERR_PTR(-ENOMEM);
 55         if (inode->i_state & I_NEW) {
 56                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
 57                      inode, ceph_vinop(inode), (u64)inode->i_ino);
 58                 unlock_new_inode(inode);
 59         }
 60 
 61         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
 62              vino.snap, inode);
 63         return inode;
 64 }
 65 
 66 /*
 67  * get/constuct snapdir inode for a given directory
 68  */
 69 struct inode *ceph_get_snapdir(struct inode *parent)
 70 {
 71         struct ceph_vino vino = {
 72                 .ino = ceph_ino(parent),
 73                 .snap = CEPH_SNAPDIR,
 74         };
 75         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
 76         struct ceph_inode_info *ci = ceph_inode(inode);
 77 
 78         BUG_ON(!S_ISDIR(parent->i_mode));
 79         if (IS_ERR(inode))
 80                 return inode;
 81         inode->i_mode = parent->i_mode;
 82         inode->i_uid = parent->i_uid;
 83         inode->i_gid = parent->i_gid;
 84         inode->i_op = &ceph_snapdir_iops;
 85         inode->i_fop = &ceph_snapdir_fops;
 86         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
 87         ci->i_rbytes = 0;
 88         return inode;
 89 }
 90 
 91 const struct inode_operations ceph_file_iops = {
 92         .permission = ceph_permission,
 93         .setattr = ceph_setattr,
 94         .getattr = ceph_getattr,
 95         .setxattr = ceph_setxattr,
 96         .getxattr = ceph_getxattr,
 97         .listxattr = ceph_listxattr,
 98         .removexattr = ceph_removexattr,
 99         .get_acl = ceph_get_acl,
100         .set_acl = ceph_set_acl,
101 };
102 
103 
104 /*
105  * We use a 'frag tree' to keep track of the MDS's directory fragments
106  * for a given inode (usually there is just a single fragment).  We
107  * need to know when a child frag is delegated to a new MDS, or when
108  * it is flagged as replicated, so we can direct our requests
109  * accordingly.
110  */
111 
112 /*
113  * find/create a frag in the tree
114  */
115 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
116                                                     u32 f)
117 {
118         struct rb_node **p;
119         struct rb_node *parent = NULL;
120         struct ceph_inode_frag *frag;
121         int c;
122 
123         p = &ci->i_fragtree.rb_node;
124         while (*p) {
125                 parent = *p;
126                 frag = rb_entry(parent, struct ceph_inode_frag, node);
127                 c = ceph_frag_compare(f, frag->frag);
128                 if (c < 0)
129                         p = &(*p)->rb_left;
130                 else if (c > 0)
131                         p = &(*p)->rb_right;
132                 else
133                         return frag;
134         }
135 
136         frag = kmalloc(sizeof(*frag), GFP_NOFS);
137         if (!frag) {
138                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
139                        "frag %x\n", &ci->vfs_inode,
140                        ceph_vinop(&ci->vfs_inode), f);
141                 return ERR_PTR(-ENOMEM);
142         }
143         frag->frag = f;
144         frag->split_by = 0;
145         frag->mds = -1;
146         frag->ndist = 0;
147 
148         rb_link_node(&frag->node, parent, p);
149         rb_insert_color(&frag->node, &ci->i_fragtree);
150 
151         dout("get_or_create_frag added %llx.%llx frag %x\n",
152              ceph_vinop(&ci->vfs_inode), f);
153         return frag;
154 }
155 
156 /*
157  * find a specific frag @f
158  */
159 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
160 {
161         struct rb_node *n = ci->i_fragtree.rb_node;
162 
163         while (n) {
164                 struct ceph_inode_frag *frag =
165                         rb_entry(n, struct ceph_inode_frag, node);
166                 int c = ceph_frag_compare(f, frag->frag);
167                 if (c < 0)
168                         n = n->rb_left;
169                 else if (c > 0)
170                         n = n->rb_right;
171                 else
172                         return frag;
173         }
174         return NULL;
175 }
176 
177 /*
178  * Choose frag containing the given value @v.  If @pfrag is
179  * specified, copy the frag delegation info to the caller if
180  * it is present.
181  */
182 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
183                               struct ceph_inode_frag *pfrag, int *found)
184 {
185         u32 t = ceph_frag_make(0, 0);
186         struct ceph_inode_frag *frag;
187         unsigned nway, i;
188         u32 n;
189 
190         if (found)
191                 *found = 0;
192 
193         while (1) {
194                 WARN_ON(!ceph_frag_contains_value(t, v));
195                 frag = __ceph_find_frag(ci, t);
196                 if (!frag)
197                         break; /* t is a leaf */
198                 if (frag->split_by == 0) {
199                         if (pfrag)
200                                 memcpy(pfrag, frag, sizeof(*pfrag));
201                         if (found)
202                                 *found = 1;
203                         break;
204                 }
205 
206                 /* choose child */
207                 nway = 1 << frag->split_by;
208                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
209                      frag->split_by, nway);
210                 for (i = 0; i < nway; i++) {
211                         n = ceph_frag_make_child(t, frag->split_by, i);
212                         if (ceph_frag_contains_value(n, v)) {
213                                 t = n;
214                                 break;
215                         }
216                 }
217                 BUG_ON(i == nway);
218         }
219         dout("choose_frag(%x) = %x\n", v, t);
220 
221         return t;
222 }
223 
224 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
225                      struct ceph_inode_frag *pfrag, int *found)
226 {
227         u32 ret;
228         mutex_lock(&ci->i_fragtree_mutex);
229         ret = __ceph_choose_frag(ci, v, pfrag, found);
230         mutex_unlock(&ci->i_fragtree_mutex);
231         return ret;
232 }
233 
234 /*
235  * Process dirfrag (delegation) info from the mds.  Include leaf
236  * fragment in tree ONLY if ndist > 0.  Otherwise, only
237  * branches/splits are included in i_fragtree)
238  */
239 static int ceph_fill_dirfrag(struct inode *inode,
240                              struct ceph_mds_reply_dirfrag *dirinfo)
241 {
242         struct ceph_inode_info *ci = ceph_inode(inode);
243         struct ceph_inode_frag *frag;
244         u32 id = le32_to_cpu(dirinfo->frag);
245         int mds = le32_to_cpu(dirinfo->auth);
246         int ndist = le32_to_cpu(dirinfo->ndist);
247         int diri_auth = -1;
248         int i;
249         int err = 0;
250 
251         spin_lock(&ci->i_ceph_lock);
252         if (ci->i_auth_cap)
253                 diri_auth = ci->i_auth_cap->mds;
254         spin_unlock(&ci->i_ceph_lock);
255 
256         mutex_lock(&ci->i_fragtree_mutex);
257         if (ndist == 0 && mds == diri_auth) {
258                 /* no delegation info needed. */
259                 frag = __ceph_find_frag(ci, id);
260                 if (!frag)
261                         goto out;
262                 if (frag->split_by == 0) {
263                         /* tree leaf, remove */
264                         dout("fill_dirfrag removed %llx.%llx frag %x"
265                              " (no ref)\n", ceph_vinop(inode), id);
266                         rb_erase(&frag->node, &ci->i_fragtree);
267                         kfree(frag);
268                 } else {
269                         /* tree branch, keep and clear */
270                         dout("fill_dirfrag cleared %llx.%llx frag %x"
271                              " referral\n", ceph_vinop(inode), id);
272                         frag->mds = -1;
273                         frag->ndist = 0;
274                 }
275                 goto out;
276         }
277 
278 
279         /* find/add this frag to store mds delegation info */
280         frag = __get_or_create_frag(ci, id);
281         if (IS_ERR(frag)) {
282                 /* this is not the end of the world; we can continue
283                    with bad/inaccurate delegation info */
284                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
285                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
286                 err = -ENOMEM;
287                 goto out;
288         }
289 
290         frag->mds = mds;
291         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
292         for (i = 0; i < frag->ndist; i++)
293                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
294         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
295              ceph_vinop(inode), frag->frag, frag->ndist);
296 
297 out:
298         mutex_unlock(&ci->i_fragtree_mutex);
299         return err;
300 }
301 
302 static int ceph_fill_fragtree(struct inode *inode,
303                               struct ceph_frag_tree_head *fragtree,
304                               struct ceph_mds_reply_dirfrag *dirinfo)
305 {
306         struct ceph_inode_info *ci = ceph_inode(inode);
307         struct ceph_inode_frag *frag;
308         struct rb_node *rb_node;
309         int i;
310         u32 id, nsplits;
311         bool update = false;
312 
313         mutex_lock(&ci->i_fragtree_mutex);
314         nsplits = le32_to_cpu(fragtree->nsplits);
315         if (nsplits) {
316                 i = prandom_u32() % nsplits;
317                 id = le32_to_cpu(fragtree->splits[i].frag);
318                 if (!__ceph_find_frag(ci, id))
319                         update = true;
320         } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
321                 rb_node = rb_first(&ci->i_fragtree);
322                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
323                 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
324                         update = true;
325         }
326         if (!update && dirinfo) {
327                 id = le32_to_cpu(dirinfo->frag);
328                 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
329                         update = true;
330         }
331         if (!update)
332                 goto out_unlock;
333 
334         dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
335         rb_node = rb_first(&ci->i_fragtree);
336         for (i = 0; i < nsplits; i++) {
337                 id = le32_to_cpu(fragtree->splits[i].frag);
338                 frag = NULL;
339                 while (rb_node) {
340                         frag = rb_entry(rb_node, struct ceph_inode_frag, node);
341                         if (ceph_frag_compare(frag->frag, id) >= 0) {
342                                 if (frag->frag != id)
343                                         frag = NULL;
344                                 else
345                                         rb_node = rb_next(rb_node);
346                                 break;
347                         }
348                         rb_node = rb_next(rb_node);
349                         rb_erase(&frag->node, &ci->i_fragtree);
350                         kfree(frag);
351                         frag = NULL;
352                 }
353                 if (!frag) {
354                         frag = __get_or_create_frag(ci, id);
355                         if (IS_ERR(frag))
356                                 continue;
357                 }
358                 frag->split_by = le32_to_cpu(fragtree->splits[i].by);
359                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
360         }
361         while (rb_node) {
362                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
363                 rb_node = rb_next(rb_node);
364                 rb_erase(&frag->node, &ci->i_fragtree);
365                 kfree(frag);
366         }
367 out_unlock:
368         mutex_unlock(&ci->i_fragtree_mutex);
369         return 0;
370 }
371 
372 /*
373  * initialize a newly allocated inode.
374  */
375 struct inode *ceph_alloc_inode(struct super_block *sb)
376 {
377         struct ceph_inode_info *ci;
378         int i;
379 
380         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
381         if (!ci)
382                 return NULL;
383 
384         dout("alloc_inode %p\n", &ci->vfs_inode);
385 
386         spin_lock_init(&ci->i_ceph_lock);
387 
388         ci->i_version = 0;
389         ci->i_inline_version = 0;
390         ci->i_time_warp_seq = 0;
391         ci->i_ceph_flags = 0;
392         atomic64_set(&ci->i_ordered_count, 1);
393         atomic64_set(&ci->i_release_count, 1);
394         atomic64_set(&ci->i_complete_seq[0], 0);
395         atomic64_set(&ci->i_complete_seq[1], 0);
396         ci->i_symlink = NULL;
397 
398         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
399         ci->i_pool_ns_len = 0;
400 
401         ci->i_fragtree = RB_ROOT;
402         mutex_init(&ci->i_fragtree_mutex);
403 
404         ci->i_xattrs.blob = NULL;
405         ci->i_xattrs.prealloc_blob = NULL;
406         ci->i_xattrs.dirty = false;
407         ci->i_xattrs.index = RB_ROOT;
408         ci->i_xattrs.count = 0;
409         ci->i_xattrs.names_size = 0;
410         ci->i_xattrs.vals_size = 0;
411         ci->i_xattrs.version = 0;
412         ci->i_xattrs.index_version = 0;
413 
414         ci->i_caps = RB_ROOT;
415         ci->i_auth_cap = NULL;
416         ci->i_dirty_caps = 0;
417         ci->i_flushing_caps = 0;
418         INIT_LIST_HEAD(&ci->i_dirty_item);
419         INIT_LIST_HEAD(&ci->i_flushing_item);
420         ci->i_prealloc_cap_flush = NULL;
421         ci->i_cap_flush_tree = RB_ROOT;
422         init_waitqueue_head(&ci->i_cap_wq);
423         ci->i_hold_caps_min = 0;
424         ci->i_hold_caps_max = 0;
425         INIT_LIST_HEAD(&ci->i_cap_delay_list);
426         INIT_LIST_HEAD(&ci->i_cap_snaps);
427         ci->i_head_snapc = NULL;
428         ci->i_snap_caps = 0;
429 
430         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
431                 ci->i_nr_by_mode[i] = 0;
432 
433         mutex_init(&ci->i_truncate_mutex);
434         ci->i_truncate_seq = 0;
435         ci->i_truncate_size = 0;
436         ci->i_truncate_pending = 0;
437 
438         ci->i_max_size = 0;
439         ci->i_reported_size = 0;
440         ci->i_wanted_max_size = 0;
441         ci->i_requested_max_size = 0;
442 
443         ci->i_pin_ref = 0;
444         ci->i_rd_ref = 0;
445         ci->i_rdcache_ref = 0;
446         ci->i_wr_ref = 0;
447         ci->i_wb_ref = 0;
448         ci->i_wrbuffer_ref = 0;
449         ci->i_wrbuffer_ref_head = 0;
450         ci->i_shared_gen = 0;
451         ci->i_rdcache_gen = 0;
452         ci->i_rdcache_revoking = 0;
453 
454         INIT_LIST_HEAD(&ci->i_unsafe_writes);
455         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
456         INIT_LIST_HEAD(&ci->i_unsafe_iops);
457         spin_lock_init(&ci->i_unsafe_lock);
458 
459         ci->i_snap_realm = NULL;
460         INIT_LIST_HEAD(&ci->i_snap_realm_item);
461         INIT_LIST_HEAD(&ci->i_snap_flush_item);
462 
463         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
464         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
465 
466         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
467 
468         ceph_fscache_inode_init(ci);
469 
470         return &ci->vfs_inode;
471 }
472 
473 static void ceph_i_callback(struct rcu_head *head)
474 {
475         struct inode *inode = container_of(head, struct inode, i_rcu);
476         struct ceph_inode_info *ci = ceph_inode(inode);
477 
478         kmem_cache_free(ceph_inode_cachep, ci);
479 }
480 
481 void ceph_destroy_inode(struct inode *inode)
482 {
483         struct ceph_inode_info *ci = ceph_inode(inode);
484         struct ceph_inode_frag *frag;
485         struct rb_node *n;
486 
487         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
488 
489         ceph_fscache_unregister_inode_cookie(ci);
490 
491         ceph_queue_caps_release(inode);
492 
493         /*
494          * we may still have a snap_realm reference if there are stray
495          * caps in i_snap_caps.
496          */
497         if (ci->i_snap_realm) {
498                 struct ceph_mds_client *mdsc =
499                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
500                 struct ceph_snap_realm *realm = ci->i_snap_realm;
501 
502                 dout(" dropping residual ref to snap realm %p\n", realm);
503                 spin_lock(&realm->inodes_with_caps_lock);
504                 list_del_init(&ci->i_snap_realm_item);
505                 spin_unlock(&realm->inodes_with_caps_lock);
506                 ceph_put_snap_realm(mdsc, realm);
507         }
508 
509         kfree(ci->i_symlink);
510         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
511                 frag = rb_entry(n, struct ceph_inode_frag, node);
512                 rb_erase(n, &ci->i_fragtree);
513                 kfree(frag);
514         }
515 
516         __ceph_destroy_xattrs(ci);
517         if (ci->i_xattrs.blob)
518                 ceph_buffer_put(ci->i_xattrs.blob);
519         if (ci->i_xattrs.prealloc_blob)
520                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
521 
522         call_rcu(&inode->i_rcu, ceph_i_callback);
523 }
524 
525 int ceph_drop_inode(struct inode *inode)
526 {
527         /*
528          * Positve dentry and corresponding inode are always accompanied
529          * in MDS reply. So no need to keep inode in the cache after
530          * dropping all its aliases.
531          */
532         return 1;
533 }
534 
535 /*
536  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
537  * careful because either the client or MDS may have more up to date
538  * info, depending on which capabilities are held, and whether
539  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
540  * and size are monotonically increasing, except when utimes() or
541  * truncate() increments the corresponding _seq values.)
542  */
543 int ceph_fill_file_size(struct inode *inode, int issued,
544                         u32 truncate_seq, u64 truncate_size, u64 size)
545 {
546         struct ceph_inode_info *ci = ceph_inode(inode);
547         int queue_trunc = 0;
548 
549         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
550             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
551                 dout("size %lld -> %llu\n", inode->i_size, size);
552                 if (size > 0 && S_ISDIR(inode->i_mode)) {
553                         pr_err("fill_file_size non-zero size for directory\n");
554                         size = 0;
555                 }
556                 i_size_write(inode, size);
557                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
558                 ci->i_reported_size = size;
559                 if (truncate_seq != ci->i_truncate_seq) {
560                         dout("truncate_seq %u -> %u\n",
561                              ci->i_truncate_seq, truncate_seq);
562                         ci->i_truncate_seq = truncate_seq;
563 
564                         /* the MDS should have revoked these caps */
565                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
566                                                CEPH_CAP_FILE_RD |
567                                                CEPH_CAP_FILE_WR |
568                                                CEPH_CAP_FILE_LAZYIO));
569                         /*
570                          * If we hold relevant caps, or in the case where we're
571                          * not the only client referencing this file and we
572                          * don't hold those caps, then we need to check whether
573                          * the file is either opened or mmaped
574                          */
575                         if ((issued & (CEPH_CAP_FILE_CACHE|
576                                        CEPH_CAP_FILE_BUFFER)) ||
577                             mapping_mapped(inode->i_mapping) ||
578                             __ceph_caps_file_wanted(ci)) {
579                                 ci->i_truncate_pending++;
580                                 queue_trunc = 1;
581                         }
582                 }
583         }
584         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
585             ci->i_truncate_size != truncate_size) {
586                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
587                      truncate_size);
588                 ci->i_truncate_size = truncate_size;
589         }
590 
591         if (queue_trunc)
592                 ceph_fscache_invalidate(inode);
593 
594         return queue_trunc;
595 }
596 
597 void ceph_fill_file_time(struct inode *inode, int issued,
598                          u64 time_warp_seq, struct timespec *ctime,
599                          struct timespec *mtime, struct timespec *atime)
600 {
601         struct ceph_inode_info *ci = ceph_inode(inode);
602         int warn = 0;
603 
604         if (issued & (CEPH_CAP_FILE_EXCL|
605                       CEPH_CAP_FILE_WR|
606                       CEPH_CAP_FILE_BUFFER|
607                       CEPH_CAP_AUTH_EXCL|
608                       CEPH_CAP_XATTR_EXCL)) {
609                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
610                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
611                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
612                              ctime->tv_sec, ctime->tv_nsec);
613                         inode->i_ctime = *ctime;
614                 }
615                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
616                         /* the MDS did a utimes() */
617                         dout("mtime %ld.%09ld -> %ld.%09ld "
618                              "tw %d -> %d\n",
619                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
620                              mtime->tv_sec, mtime->tv_nsec,
621                              ci->i_time_warp_seq, (int)time_warp_seq);
622 
623                         inode->i_mtime = *mtime;
624                         inode->i_atime = *atime;
625                         ci->i_time_warp_seq = time_warp_seq;
626                 } else if (time_warp_seq == ci->i_time_warp_seq) {
627                         /* nobody did utimes(); take the max */
628                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
629                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
630                                      inode->i_mtime.tv_sec,
631                                      inode->i_mtime.tv_nsec,
632                                      mtime->tv_sec, mtime->tv_nsec);
633                                 inode->i_mtime = *mtime;
634                         }
635                         if (timespec_compare(atime, &inode->i_atime) > 0) {
636                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
637                                      inode->i_atime.tv_sec,
638                                      inode->i_atime.tv_nsec,
639                                      atime->tv_sec, atime->tv_nsec);
640                                 inode->i_atime = *atime;
641                         }
642                 } else if (issued & CEPH_CAP_FILE_EXCL) {
643                         /* we did a utimes(); ignore mds values */
644                 } else {
645                         warn = 1;
646                 }
647         } else {
648                 /* we have no write|excl caps; whatever the MDS says is true */
649                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
650                         inode->i_ctime = *ctime;
651                         inode->i_mtime = *mtime;
652                         inode->i_atime = *atime;
653                         ci->i_time_warp_seq = time_warp_seq;
654                 } else {
655                         warn = 1;
656                 }
657         }
658         if (warn) /* time_warp_seq shouldn't go backwards */
659                 dout("%p mds time_warp_seq %llu < %u\n",
660                      inode, time_warp_seq, ci->i_time_warp_seq);
661 }
662 
663 /*
664  * Populate an inode based on info from mds.  May be called on new or
665  * existing inodes.
666  */
667 static int fill_inode(struct inode *inode, struct page *locked_page,
668                       struct ceph_mds_reply_info_in *iinfo,
669                       struct ceph_mds_reply_dirfrag *dirinfo,
670                       struct ceph_mds_session *session,
671                       unsigned long ttl_from, int cap_fmode,
672                       struct ceph_cap_reservation *caps_reservation)
673 {
674         struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
675         struct ceph_mds_reply_inode *info = iinfo->in;
676         struct ceph_inode_info *ci = ceph_inode(inode);
677         int issued = 0, implemented, new_issued;
678         struct timespec mtime, atime, ctime;
679         struct ceph_buffer *xattr_blob = NULL;
680         struct ceph_cap *new_cap = NULL;
681         int err = 0;
682         bool wake = false;
683         bool queue_trunc = false;
684         bool new_version = false;
685         bool fill_inline = false;
686 
687         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
688              inode, ceph_vinop(inode), le64_to_cpu(info->version),
689              ci->i_version);
690 
691         /* prealloc new cap struct */
692         if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP)
693                 new_cap = ceph_get_cap(mdsc, caps_reservation);
694 
695         /*
696          * prealloc xattr data, if it looks like we'll need it.  only
697          * if len > 4 (meaning there are actually xattrs; the first 4
698          * bytes are the xattr count).
699          */
700         if (iinfo->xattr_len > 4) {
701                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
702                 if (!xattr_blob)
703                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
704                                iinfo->xattr_len);
705         }
706 
707         spin_lock(&ci->i_ceph_lock);
708 
709         /*
710          * provided version will be odd if inode value is projected,
711          * even if stable.  skip the update if we have newer stable
712          * info (ours>=theirs, e.g. due to racing mds replies), unless
713          * we are getting projected (unstable) info (in which case the
714          * version is odd, and we want ours>theirs).
715          *   us   them
716          *   2    2     skip
717          *   3    2     skip
718          *   3    3     update
719          */
720         if (ci->i_version == 0 ||
721             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
722              le64_to_cpu(info->version) > (ci->i_version & ~1)))
723                 new_version = true;
724 
725         issued = __ceph_caps_issued(ci, &implemented);
726         issued |= implemented | __ceph_caps_dirty(ci);
727         new_issued = ~issued & le32_to_cpu(info->cap.caps);
728 
729         /* update inode */
730         ci->i_version = le64_to_cpu(info->version);
731         inode->i_version++;
732         inode->i_rdev = le32_to_cpu(info->rdev);
733         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
734 
735         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
736             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
737                 inode->i_mode = le32_to_cpu(info->mode);
738                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
739                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
740                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
741                      from_kuid(&init_user_ns, inode->i_uid),
742                      from_kgid(&init_user_ns, inode->i_gid));
743         }
744 
745         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
746             (issued & CEPH_CAP_LINK_EXCL) == 0)
747                 set_nlink(inode, le32_to_cpu(info->nlink));
748 
749         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
750                 /* be careful with mtime, atime, size */
751                 ceph_decode_timespec(&atime, &info->atime);
752                 ceph_decode_timespec(&mtime, &info->mtime);
753                 ceph_decode_timespec(&ctime, &info->ctime);
754                 ceph_fill_file_time(inode, issued,
755                                 le32_to_cpu(info->time_warp_seq),
756                                 &ctime, &mtime, &atime);
757         }
758 
759         if (new_version ||
760             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
761                 if (ci->i_layout.fl_pg_pool != info->layout.fl_pg_pool)
762                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
763                 ci->i_layout = info->layout;
764                 ci->i_pool_ns_len = iinfo->pool_ns_len;
765 
766                 queue_trunc = ceph_fill_file_size(inode, issued,
767                                         le32_to_cpu(info->truncate_seq),
768                                         le64_to_cpu(info->truncate_size),
769                                         le64_to_cpu(info->size));
770                 /* only update max_size on auth cap */
771                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
772                     ci->i_max_size != le64_to_cpu(info->max_size)) {
773                         dout("max_size %lld -> %llu\n", ci->i_max_size,
774                                         le64_to_cpu(info->max_size));
775                         ci->i_max_size = le64_to_cpu(info->max_size);
776                 }
777         }
778 
779         /* xattrs */
780         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
781         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
782             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
783                 if (ci->i_xattrs.blob)
784                         ceph_buffer_put(ci->i_xattrs.blob);
785                 ci->i_xattrs.blob = xattr_blob;
786                 if (xattr_blob)
787                         memcpy(ci->i_xattrs.blob->vec.iov_base,
788                                iinfo->xattr_data, iinfo->xattr_len);
789                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
790                 ceph_forget_all_cached_acls(inode);
791                 xattr_blob = NULL;
792         }
793 
794         inode->i_mapping->a_ops = &ceph_aops;
795 
796         switch (inode->i_mode & S_IFMT) {
797         case S_IFIFO:
798         case S_IFBLK:
799         case S_IFCHR:
800         case S_IFSOCK:
801                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
802                 inode->i_op = &ceph_file_iops;
803                 break;
804         case S_IFREG:
805                 inode->i_op = &ceph_file_iops;
806                 inode->i_fop = &ceph_file_fops;
807                 break;
808         case S_IFLNK:
809                 inode->i_op = &ceph_symlink_iops;
810                 if (!ci->i_symlink) {
811                         u32 symlen = iinfo->symlink_len;
812                         char *sym;
813 
814                         spin_unlock(&ci->i_ceph_lock);
815 
816                         err = -EINVAL;
817                         if (WARN_ON(symlen != i_size_read(inode)))
818                                 goto out;
819 
820                         err = -ENOMEM;
821                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
822                         if (!sym)
823                                 goto out;
824 
825                         spin_lock(&ci->i_ceph_lock);
826                         if (!ci->i_symlink)
827                                 ci->i_symlink = sym;
828                         else
829                                 kfree(sym); /* lost a race */
830                 }
831                 inode->i_link = ci->i_symlink;
832                 break;
833         case S_IFDIR:
834                 inode->i_op = &ceph_dir_iops;
835                 inode->i_fop = &ceph_dir_fops;
836 
837                 ci->i_dir_layout = iinfo->dir_layout;
838 
839                 ci->i_files = le64_to_cpu(info->files);
840                 ci->i_subdirs = le64_to_cpu(info->subdirs);
841                 ci->i_rbytes = le64_to_cpu(info->rbytes);
842                 ci->i_rfiles = le64_to_cpu(info->rfiles);
843                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
844                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
845                 break;
846         default:
847                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
848                        ceph_vinop(inode), inode->i_mode);
849         }
850 
851         /* were we issued a capability? */
852         if (info->cap.caps) {
853                 if (ceph_snap(inode) == CEPH_NOSNAP) {
854                         unsigned caps = le32_to_cpu(info->cap.caps);
855                         ceph_add_cap(inode, session,
856                                      le64_to_cpu(info->cap.cap_id),
857                                      cap_fmode, caps,
858                                      le32_to_cpu(info->cap.wanted),
859                                      le32_to_cpu(info->cap.seq),
860                                      le32_to_cpu(info->cap.mseq),
861                                      le64_to_cpu(info->cap.realm),
862                                      info->cap.flags, &new_cap);
863 
864                         /* set dir completion flag? */
865                         if (S_ISDIR(inode->i_mode) &&
866                             ci->i_files == 0 && ci->i_subdirs == 0 &&
867                             (caps & CEPH_CAP_FILE_SHARED) &&
868                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
869                             !__ceph_dir_is_complete(ci)) {
870                                 dout(" marking %p complete (empty)\n", inode);
871                                 i_size_write(inode, 0);
872                                 __ceph_dir_set_complete(ci,
873                                         atomic64_read(&ci->i_release_count),
874                                         atomic64_read(&ci->i_ordered_count));
875                         }
876 
877                         wake = true;
878                 } else {
879                         dout(" %p got snap_caps %s\n", inode,
880                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
881                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
882                         if (cap_fmode >= 0)
883                                 __ceph_get_fmode(ci, cap_fmode);
884                 }
885         } else if (cap_fmode >= 0) {
886                 pr_warn("mds issued no caps on %llx.%llx\n",
887                            ceph_vinop(inode));
888                 __ceph_get_fmode(ci, cap_fmode);
889         }
890 
891         if (iinfo->inline_version > 0 &&
892             iinfo->inline_version >= ci->i_inline_version) {
893                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
894                 ci->i_inline_version = iinfo->inline_version;
895                 if (ci->i_inline_version != CEPH_INLINE_NONE &&
896                     (locked_page ||
897                      (le32_to_cpu(info->cap.caps) & cache_caps)))
898                         fill_inline = true;
899         }
900 
901         spin_unlock(&ci->i_ceph_lock);
902 
903         if (fill_inline)
904                 ceph_fill_inline_data(inode, locked_page,
905                                       iinfo->inline_data, iinfo->inline_len);
906 
907         if (wake)
908                 wake_up_all(&ci->i_cap_wq);
909 
910         /* queue truncate if we saw i_size decrease */
911         if (queue_trunc)
912                 ceph_queue_vmtruncate(inode);
913 
914         /* populate frag tree */
915         if (S_ISDIR(inode->i_mode))
916                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
917 
918         /* update delegation info? */
919         if (dirinfo)
920                 ceph_fill_dirfrag(inode, dirinfo);
921 
922         err = 0;
923 out:
924         if (new_cap)
925                 ceph_put_cap(mdsc, new_cap);
926         if (xattr_blob)
927                 ceph_buffer_put(xattr_blob);
928         return err;
929 }
930 
931 /*
932  * caller should hold session s_mutex.
933  */
934 static void update_dentry_lease(struct dentry *dentry,
935                                 struct ceph_mds_reply_lease *lease,
936                                 struct ceph_mds_session *session,
937                                 unsigned long from_time)
938 {
939         struct ceph_dentry_info *di = ceph_dentry(dentry);
940         long unsigned duration = le32_to_cpu(lease->duration_ms);
941         long unsigned ttl = from_time + (duration * HZ) / 1000;
942         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
943         struct inode *dir;
944 
945         /* only track leases on regular dentries */
946         if (dentry->d_op != &ceph_dentry_ops)
947                 return;
948 
949         spin_lock(&dentry->d_lock);
950         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
951              dentry, duration, ttl);
952 
953         /* make lease_rdcache_gen match directory */
954         dir = d_inode(dentry->d_parent);
955         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
956 
957         if (duration == 0)
958                 goto out_unlock;
959 
960         if (di->lease_gen == session->s_cap_gen &&
961             time_before(ttl, dentry->d_time))
962                 goto out_unlock;  /* we already have a newer lease. */
963 
964         if (di->lease_session && di->lease_session != session)
965                 goto out_unlock;
966 
967         ceph_dentry_lru_touch(dentry);
968 
969         if (!di->lease_session)
970                 di->lease_session = ceph_get_mds_session(session);
971         di->lease_gen = session->s_cap_gen;
972         di->lease_seq = le32_to_cpu(lease->seq);
973         di->lease_renew_after = half_ttl;
974         di->lease_renew_from = 0;
975         dentry->d_time = ttl;
976 out_unlock:
977         spin_unlock(&dentry->d_lock);
978         return;
979 }
980 
981 /*
982  * splice a dentry to an inode.
983  * caller must hold directory i_mutex for this to be safe.
984  */
985 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in)
986 {
987         struct dentry *realdn;
988 
989         BUG_ON(d_inode(dn));
990 
991         /* dn must be unhashed */
992         if (!d_unhashed(dn))
993                 d_drop(dn);
994         realdn = d_splice_alias(in, dn);
995         if (IS_ERR(realdn)) {
996                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
997                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
998                 dn = realdn; /* note realdn contains the error */
999                 goto out;
1000         } else if (realdn) {
1001                 dout("dn %p (%d) spliced with %p (%d) "
1002                      "inode %p ino %llx.%llx\n",
1003                      dn, d_count(dn),
1004                      realdn, d_count(realdn),
1005                      d_inode(realdn), ceph_vinop(d_inode(realdn)));
1006                 dput(dn);
1007                 dn = realdn;
1008         } else {
1009                 BUG_ON(!ceph_dentry(dn));
1010                 dout("dn %p attached to %p ino %llx.%llx\n",
1011                      dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1012         }
1013 out:
1014         return dn;
1015 }
1016 
1017 /*
1018  * Incorporate results into the local cache.  This is either just
1019  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1020  * after a lookup).
1021  *
1022  * A reply may contain
1023  *         a directory inode along with a dentry.
1024  *  and/or a target inode
1025  *
1026  * Called with snap_rwsem (read).
1027  */
1028 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
1029                     struct ceph_mds_session *session)
1030 {
1031         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1032         struct inode *in = NULL;
1033         struct ceph_vino vino;
1034         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1035         int err = 0;
1036 
1037         dout("fill_trace %p is_dentry %d is_target %d\n", req,
1038              rinfo->head->is_dentry, rinfo->head->is_target);
1039 
1040 #if 0
1041         /*
1042          * Debugging hook:
1043          *
1044          * If we resend completed ops to a recovering mds, we get no
1045          * trace.  Since that is very rare, pretend this is the case
1046          * to ensure the 'no trace' handlers in the callers behave.
1047          *
1048          * Fill in inodes unconditionally to avoid breaking cap
1049          * invariants.
1050          */
1051         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
1052                 pr_info("fill_trace faking empty trace on %lld %s\n",
1053                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
1054                 if (rinfo->head->is_dentry) {
1055                         rinfo->head->is_dentry = 0;
1056                         err = fill_inode(req->r_locked_dir,
1057                                          &rinfo->diri, rinfo->dirfrag,
1058                                          session, req->r_request_started, -1);
1059                 }
1060                 if (rinfo->head->is_target) {
1061                         rinfo->head->is_target = 0;
1062                         ininfo = rinfo->targeti.in;
1063                         vino.ino = le64_to_cpu(ininfo->ino);
1064                         vino.snap = le64_to_cpu(ininfo->snapid);
1065                         in = ceph_get_inode(sb, vino);
1066                         err = fill_inode(in, &rinfo->targeti, NULL,
1067                                          session, req->r_request_started,
1068                                          req->r_fmode);
1069                         iput(in);
1070                 }
1071         }
1072 #endif
1073 
1074         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1075                 dout("fill_trace reply is empty!\n");
1076                 if (rinfo->head->result == 0 && req->r_locked_dir)
1077                         ceph_invalidate_dir_request(req);
1078                 return 0;
1079         }
1080 
1081         if (rinfo->head->is_dentry) {
1082                 struct inode *dir = req->r_locked_dir;
1083 
1084                 if (dir) {
1085                         err = fill_inode(dir, NULL,
1086                                          &rinfo->diri, rinfo->dirfrag,
1087                                          session, req->r_request_started, -1,
1088                                          &req->r_caps_reservation);
1089                         if (err < 0)
1090                                 goto done;
1091                 } else {
1092                         WARN_ON_ONCE(1);
1093                 }
1094 
1095                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1096                         struct qstr dname;
1097                         struct dentry *dn, *parent;
1098 
1099                         BUG_ON(!rinfo->head->is_target);
1100                         BUG_ON(req->r_dentry);
1101 
1102                         parent = d_find_any_alias(dir);
1103                         BUG_ON(!parent);
1104 
1105                         dname.name = rinfo->dname;
1106                         dname.len = rinfo->dname_len;
1107                         dname.hash = full_name_hash(dname.name, dname.len);
1108                         vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1109                         vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1110 retry_lookup:
1111                         dn = d_lookup(parent, &dname);
1112                         dout("d_lookup on parent=%p name=%.*s got %p\n",
1113                              parent, dname.len, dname.name, dn);
1114 
1115                         if (!dn) {
1116                                 dn = d_alloc(parent, &dname);
1117                                 dout("d_alloc %p '%.*s' = %p\n", parent,
1118                                      dname.len, dname.name, dn);
1119                                 if (dn == NULL) {
1120                                         dput(parent);
1121                                         err = -ENOMEM;
1122                                         goto done;
1123                                 }
1124                                 err = ceph_init_dentry(dn);
1125                                 if (err < 0) {
1126                                         dput(dn);
1127                                         dput(parent);
1128                                         goto done;
1129                                 }
1130                         } else if (d_really_is_positive(dn) &&
1131                                    (ceph_ino(d_inode(dn)) != vino.ino ||
1132                                     ceph_snap(d_inode(dn)) != vino.snap)) {
1133                                 dout(" dn %p points to wrong inode %p\n",
1134                                      dn, d_inode(dn));
1135                                 d_delete(dn);
1136                                 dput(dn);
1137                                 goto retry_lookup;
1138                         }
1139 
1140                         req->r_dentry = dn;
1141                         dput(parent);
1142                 }
1143         }
1144 
1145         if (rinfo->head->is_target) {
1146                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1147                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1148 
1149                 in = ceph_get_inode(sb, vino);
1150                 if (IS_ERR(in)) {
1151                         err = PTR_ERR(in);
1152                         goto done;
1153                 }
1154                 req->r_target_inode = in;
1155 
1156                 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1157                                 session, req->r_request_started,
1158                                 (!req->r_aborted && rinfo->head->result == 0) ?
1159                                 req->r_fmode : -1,
1160                                 &req->r_caps_reservation);
1161                 if (err < 0) {
1162                         pr_err("fill_inode badness %p %llx.%llx\n",
1163                                 in, ceph_vinop(in));
1164                         goto done;
1165                 }
1166         }
1167 
1168         /*
1169          * ignore null lease/binding on snapdir ENOENT, or else we
1170          * will have trouble splicing in the virtual snapdir later
1171          */
1172         if (rinfo->head->is_dentry && !req->r_aborted &&
1173             req->r_locked_dir &&
1174             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1175                                                fsc->mount_options->snapdir_name,
1176                                                req->r_dentry->d_name.len))) {
1177                 /*
1178                  * lookup link rename   : null -> possibly existing inode
1179                  * mknod symlink mkdir  : null -> new inode
1180                  * unlink               : linked -> null
1181                  */
1182                 struct inode *dir = req->r_locked_dir;
1183                 struct dentry *dn = req->r_dentry;
1184                 bool have_dir_cap, have_lease;
1185 
1186                 BUG_ON(!dn);
1187                 BUG_ON(!dir);
1188                 BUG_ON(d_inode(dn->d_parent) != dir);
1189                 BUG_ON(ceph_ino(dir) !=
1190                        le64_to_cpu(rinfo->diri.in->ino));
1191                 BUG_ON(ceph_snap(dir) !=
1192                        le64_to_cpu(rinfo->diri.in->snapid));
1193 
1194                 /* do we have a lease on the whole dir? */
1195                 have_dir_cap =
1196                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1197                          CEPH_CAP_FILE_SHARED);
1198 
1199                 /* do we have a dn lease? */
1200                 have_lease = have_dir_cap ||
1201                         le32_to_cpu(rinfo->dlease->duration_ms);
1202                 if (!have_lease)
1203                         dout("fill_trace  no dentry lease or dir cap\n");
1204 
1205                 /* rename? */
1206                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1207                         struct inode *olddir = req->r_old_dentry_dir;
1208                         BUG_ON(!olddir);
1209 
1210                         dout(" src %p '%pd' dst %p '%pd'\n",
1211                              req->r_old_dentry,
1212                              req->r_old_dentry,
1213                              dn, dn);
1214                         dout("fill_trace doing d_move %p -> %p\n",
1215                              req->r_old_dentry, dn);
1216 
1217                         /* d_move screws up sibling dentries' offsets */
1218                         ceph_dir_clear_ordered(dir);
1219                         ceph_dir_clear_ordered(olddir);
1220 
1221                         d_move(req->r_old_dentry, dn);
1222                         dout(" src %p '%pd' dst %p '%pd'\n",
1223                              req->r_old_dentry,
1224                              req->r_old_dentry,
1225                              dn, dn);
1226 
1227                         /* ensure target dentry is invalidated, despite
1228                            rehashing bug in vfs_rename_dir */
1229                         ceph_invalidate_dentry_lease(dn);
1230 
1231                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1232                              ceph_dentry(req->r_old_dentry)->offset);
1233 
1234                         dn = req->r_old_dentry;  /* use old_dentry */
1235                 }
1236 
1237                 /* null dentry? */
1238                 if (!rinfo->head->is_target) {
1239                         dout("fill_trace null dentry\n");
1240                         if (d_really_is_positive(dn)) {
1241                                 ceph_dir_clear_ordered(dir);
1242                                 dout("d_delete %p\n", dn);
1243                                 d_delete(dn);
1244                         } else {
1245                                 if (have_lease && d_unhashed(dn))
1246                                         d_add(dn, NULL);
1247                                 update_dentry_lease(dn, rinfo->dlease,
1248                                                     session,
1249                                                     req->r_request_started);
1250                         }
1251                         goto done;
1252                 }
1253 
1254                 /* attach proper inode */
1255                 if (d_really_is_negative(dn)) {
1256                         ceph_dir_clear_ordered(dir);
1257                         ihold(in);
1258                         dn = splice_dentry(dn, in);
1259                         if (IS_ERR(dn)) {
1260                                 err = PTR_ERR(dn);
1261                                 goto done;
1262                         }
1263                         req->r_dentry = dn;  /* may have spliced */
1264                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1265                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1266                              dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1267                              ceph_vinop(in));
1268                         d_invalidate(dn);
1269                         have_lease = false;
1270                 }
1271 
1272                 if (have_lease)
1273                         update_dentry_lease(dn, rinfo->dlease, session,
1274                                             req->r_request_started);
1275                 dout(" final dn %p\n", dn);
1276         } else if (!req->r_aborted &&
1277                    (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1278                     req->r_op == CEPH_MDS_OP_MKSNAP)) {
1279                 struct dentry *dn = req->r_dentry;
1280                 struct inode *dir = req->r_locked_dir;
1281 
1282                 /* fill out a snapdir LOOKUPSNAP dentry */
1283                 BUG_ON(!dn);
1284                 BUG_ON(!dir);
1285                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1286                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1287                 ceph_dir_clear_ordered(dir);
1288                 ihold(in);
1289                 dn = splice_dentry(dn, in);
1290                 if (IS_ERR(dn)) {
1291                         err = PTR_ERR(dn);
1292                         goto done;
1293                 }
1294                 req->r_dentry = dn;  /* may have spliced */
1295         }
1296 done:
1297         dout("fill_trace done err=%d\n", err);
1298         return err;
1299 }
1300 
1301 /*
1302  * Prepopulate our cache with readdir results, leases, etc.
1303  */
1304 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1305                                            struct ceph_mds_session *session)
1306 {
1307         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1308         int i, err = 0;
1309 
1310         for (i = 0; i < rinfo->dir_nr; i++) {
1311                 struct ceph_vino vino;
1312                 struct inode *in;
1313                 int rc;
1314 
1315                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1316                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1317 
1318                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1319                 if (IS_ERR(in)) {
1320                         err = PTR_ERR(in);
1321                         dout("new_inode badness got %d\n", err);
1322                         continue;
1323                 }
1324                 rc = fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session,
1325                                 req->r_request_started, -1,
1326                                 &req->r_caps_reservation);
1327                 if (rc < 0) {
1328                         pr_err("fill_inode badness on %p got %d\n", in, rc);
1329                         err = rc;
1330                         continue;
1331                 }
1332         }
1333 
1334         return err;
1335 }
1336 
1337 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1338 {
1339         if (ctl->page) {
1340                 kunmap(ctl->page);
1341                 put_page(ctl->page);
1342                 ctl->page = NULL;
1343         }
1344 }
1345 
1346 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1347                               struct ceph_readdir_cache_control *ctl,
1348                               struct ceph_mds_request *req)
1349 {
1350         struct ceph_inode_info *ci = ceph_inode(dir);
1351         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1352         unsigned idx = ctl->index % nsize;
1353         pgoff_t pgoff = ctl->index / nsize;
1354 
1355         if (!ctl->page || pgoff != page_index(ctl->page)) {
1356                 ceph_readdir_cache_release(ctl);
1357                 if (idx == 0)
1358                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1359                 else
1360                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1361                 if (!ctl->page) {
1362                         ctl->index = -1;
1363                         return idx == 0 ? -ENOMEM : 0;
1364                 }
1365                 /* reading/filling the cache are serialized by
1366                  * i_mutex, no need to use page lock */
1367                 unlock_page(ctl->page);
1368                 ctl->dentries = kmap(ctl->page);
1369                 if (idx == 0)
1370                         memset(ctl->dentries, 0, PAGE_SIZE);
1371         }
1372 
1373         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1374             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1375                 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1376                 ctl->dentries[idx] = dn;
1377                 ctl->index++;
1378         } else {
1379                 dout("disable readdir cache\n");
1380                 ctl->index = -1;
1381         }
1382         return 0;
1383 }
1384 
1385 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1386                              struct ceph_mds_session *session)
1387 {
1388         struct dentry *parent = req->r_dentry;
1389         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1390         struct qstr dname;
1391         struct dentry *dn;
1392         struct inode *in;
1393         int err = 0, skipped = 0, ret, i;
1394         struct inode *snapdir = NULL;
1395         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1396         struct ceph_dentry_info *di;
1397         u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1398         struct ceph_readdir_cache_control cache_ctl = {};
1399 
1400         if (req->r_aborted)
1401                 return readdir_prepopulate_inodes_only(req, session);
1402 
1403         if (rinfo->dir_dir &&
1404             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1405                 dout("readdir_prepopulate got new frag %x -> %x\n",
1406                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1407                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1408                 if (ceph_frag_is_leftmost(frag))
1409                         req->r_readdir_offset = 2;
1410                 else
1411                         req->r_readdir_offset = 0;
1412         }
1413 
1414         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1415                 snapdir = ceph_get_snapdir(d_inode(parent));
1416                 parent = d_find_alias(snapdir);
1417                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1418                      rinfo->dir_nr, parent);
1419         } else {
1420                 dout("readdir_prepopulate %d items under dn %p\n",
1421                      rinfo->dir_nr, parent);
1422                 if (rinfo->dir_dir)
1423                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1424         }
1425 
1426         if (ceph_frag_is_leftmost(frag) && req->r_readdir_offset == 2) {
1427                 /* note dir version at start of readdir so we can tell
1428                  * if any dentries get dropped */
1429                 struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1430                 req->r_dir_release_cnt = atomic64_read(&ci->i_release_count);
1431                 req->r_dir_ordered_cnt = atomic64_read(&ci->i_ordered_count);
1432                 req->r_readdir_cache_idx = 0;
1433         }
1434 
1435         cache_ctl.index = req->r_readdir_cache_idx;
1436 
1437         /* FIXME: release caps/leases if error occurs */
1438         for (i = 0; i < rinfo->dir_nr; i++) {
1439                 struct ceph_vino vino;
1440 
1441                 dname.name = rinfo->dir_dname[i];
1442                 dname.len = rinfo->dir_dname_len[i];
1443                 dname.hash = full_name_hash(dname.name, dname.len);
1444 
1445                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1446                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1447 
1448 retry_lookup:
1449                 dn = d_lookup(parent, &dname);
1450                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1451                      parent, dname.len, dname.name, dn);
1452 
1453                 if (!dn) {
1454                         dn = d_alloc(parent, &dname);
1455                         dout("d_alloc %p '%.*s' = %p\n", parent,
1456                              dname.len, dname.name, dn);
1457                         if (dn == NULL) {
1458                                 dout("d_alloc badness\n");
1459                                 err = -ENOMEM;
1460                                 goto out;
1461                         }
1462                         ret = ceph_init_dentry(dn);
1463                         if (ret < 0) {
1464                                 dput(dn);
1465                                 err = ret;
1466                                 goto out;
1467                         }
1468                 } else if (d_really_is_positive(dn) &&
1469                            (ceph_ino(d_inode(dn)) != vino.ino ||
1470                             ceph_snap(d_inode(dn)) != vino.snap)) {
1471                         dout(" dn %p points to wrong inode %p\n",
1472                              dn, d_inode(dn));
1473                         d_delete(dn);
1474                         dput(dn);
1475                         goto retry_lookup;
1476                 }
1477 
1478                 /* inode */
1479                 if (d_really_is_positive(dn)) {
1480                         in = d_inode(dn);
1481                 } else {
1482                         in = ceph_get_inode(parent->d_sb, vino);
1483                         if (IS_ERR(in)) {
1484                                 dout("new_inode badness\n");
1485                                 d_drop(dn);
1486                                 dput(dn);
1487                                 err = PTR_ERR(in);
1488                                 goto out;
1489                         }
1490                 }
1491 
1492                 ret = fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session,
1493                                  req->r_request_started, -1,
1494                                  &req->r_caps_reservation);
1495                 if (ret < 0) {
1496                         pr_err("fill_inode badness on %p\n", in);
1497                         if (d_really_is_negative(dn))
1498                                 iput(in);
1499                         d_drop(dn);
1500                         err = ret;
1501                         goto next_item;
1502                 }
1503 
1504                 if (d_really_is_negative(dn)) {
1505                         struct dentry *realdn;
1506 
1507                         if (ceph_security_xattr_deadlock(in)) {
1508                                 dout(" skip splicing dn %p to inode %p"
1509                                      " (security xattr deadlock)\n", dn, in);
1510                                 iput(in);
1511                                 skipped++;
1512                                 goto next_item;
1513                         }
1514 
1515                         realdn = splice_dentry(dn, in);
1516                         if (IS_ERR(realdn)) {
1517                                 err = PTR_ERR(realdn);
1518                                 d_drop(dn);
1519                                 dn = NULL;
1520                                 goto next_item;
1521                         }
1522                         dn = realdn;
1523                 }
1524 
1525                 di = dn->d_fsdata;
1526                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1527 
1528                 update_dentry_lease(dn, rinfo->dir_dlease[i],
1529                                     req->r_session,
1530                                     req->r_request_started);
1531 
1532                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1533                         ret = fill_readdir_cache(d_inode(parent), dn,
1534                                                  &cache_ctl, req);
1535                         if (ret < 0)
1536                                 err = ret;
1537                 }
1538 next_item:
1539                 if (dn)
1540                         dput(dn);
1541         }
1542 out:
1543         if (err == 0 && skipped == 0) {
1544                 req->r_did_prepopulate = true;
1545                 req->r_readdir_cache_idx = cache_ctl.index;
1546         }
1547         ceph_readdir_cache_release(&cache_ctl);
1548         if (snapdir) {
1549                 iput(snapdir);
1550                 dput(parent);
1551         }
1552         dout("readdir_prepopulate done\n");
1553         return err;
1554 }
1555 
1556 int ceph_inode_set_size(struct inode *inode, loff_t size)
1557 {
1558         struct ceph_inode_info *ci = ceph_inode(inode);
1559         int ret = 0;
1560 
1561         spin_lock(&ci->i_ceph_lock);
1562         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1563         i_size_write(inode, size);
1564         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1565 
1566         /* tell the MDS if we are approaching max_size */
1567         if ((size << 1) >= ci->i_max_size &&
1568             (ci->i_reported_size << 1) < ci->i_max_size)
1569                 ret = 1;
1570 
1571         spin_unlock(&ci->i_ceph_lock);
1572         return ret;
1573 }
1574 
1575 /*
1576  * Write back inode data in a worker thread.  (This can't be done
1577  * in the message handler context.)
1578  */
1579 void ceph_queue_writeback(struct inode *inode)
1580 {
1581         ihold(inode);
1582         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1583                        &ceph_inode(inode)->i_wb_work)) {
1584                 dout("ceph_queue_writeback %p\n", inode);
1585         } else {
1586                 dout("ceph_queue_writeback %p failed\n", inode);
1587                 iput(inode);
1588         }
1589 }
1590 
1591 static void ceph_writeback_work(struct work_struct *work)
1592 {
1593         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1594                                                   i_wb_work);
1595         struct inode *inode = &ci->vfs_inode;
1596 
1597         dout("writeback %p\n", inode);
1598         filemap_fdatawrite(&inode->i_data);
1599         iput(inode);
1600 }
1601 
1602 /*
1603  * queue an async invalidation
1604  */
1605 void ceph_queue_invalidate(struct inode *inode)
1606 {
1607         ihold(inode);
1608         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1609                        &ceph_inode(inode)->i_pg_inv_work)) {
1610                 dout("ceph_queue_invalidate %p\n", inode);
1611         } else {
1612                 dout("ceph_queue_invalidate %p failed\n", inode);
1613                 iput(inode);
1614         }
1615 }
1616 
1617 /*
1618  * Invalidate inode pages in a worker thread.  (This can't be done
1619  * in the message handler context.)
1620  */
1621 static void ceph_invalidate_work(struct work_struct *work)
1622 {
1623         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1624                                                   i_pg_inv_work);
1625         struct inode *inode = &ci->vfs_inode;
1626         u32 orig_gen;
1627         int check = 0;
1628 
1629         mutex_lock(&ci->i_truncate_mutex);
1630         spin_lock(&ci->i_ceph_lock);
1631         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1632              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1633         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1634                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1635                         check = 1;
1636                 spin_unlock(&ci->i_ceph_lock);
1637                 mutex_unlock(&ci->i_truncate_mutex);
1638                 goto out;
1639         }
1640         orig_gen = ci->i_rdcache_gen;
1641         spin_unlock(&ci->i_ceph_lock);
1642 
1643         truncate_pagecache(inode, 0);
1644 
1645         spin_lock(&ci->i_ceph_lock);
1646         if (orig_gen == ci->i_rdcache_gen &&
1647             orig_gen == ci->i_rdcache_revoking) {
1648                 dout("invalidate_pages %p gen %d successful\n", inode,
1649                      ci->i_rdcache_gen);
1650                 ci->i_rdcache_revoking--;
1651                 check = 1;
1652         } else {
1653                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1654                      inode, orig_gen, ci->i_rdcache_gen,
1655                      ci->i_rdcache_revoking);
1656                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1657                         check = 1;
1658         }
1659         spin_unlock(&ci->i_ceph_lock);
1660         mutex_unlock(&ci->i_truncate_mutex);
1661 out:
1662         if (check)
1663                 ceph_check_caps(ci, 0, NULL);
1664         iput(inode);
1665 }
1666 
1667 
1668 /*
1669  * called by trunc_wq;
1670  *
1671  * We also truncate in a separate thread as well.
1672  */
1673 static void ceph_vmtruncate_work(struct work_struct *work)
1674 {
1675         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1676                                                   i_vmtruncate_work);
1677         struct inode *inode = &ci->vfs_inode;
1678 
1679         dout("vmtruncate_work %p\n", inode);
1680         __ceph_do_pending_vmtruncate(inode);
1681         iput(inode);
1682 }
1683 
1684 /*
1685  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1686  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1687  */
1688 void ceph_queue_vmtruncate(struct inode *inode)
1689 {
1690         struct ceph_inode_info *ci = ceph_inode(inode);
1691 
1692         ihold(inode);
1693 
1694         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1695                        &ci->i_vmtruncate_work)) {
1696                 dout("ceph_queue_vmtruncate %p\n", inode);
1697         } else {
1698                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1699                      inode, ci->i_truncate_pending);
1700                 iput(inode);
1701         }
1702 }
1703 
1704 /*
1705  * Make sure any pending truncation is applied before doing anything
1706  * that may depend on it.
1707  */
1708 void __ceph_do_pending_vmtruncate(struct inode *inode)
1709 {
1710         struct ceph_inode_info *ci = ceph_inode(inode);
1711         u64 to;
1712         int wrbuffer_refs, finish = 0;
1713 
1714         mutex_lock(&ci->i_truncate_mutex);
1715 retry:
1716         spin_lock(&ci->i_ceph_lock);
1717         if (ci->i_truncate_pending == 0) {
1718                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1719                 spin_unlock(&ci->i_ceph_lock);
1720                 mutex_unlock(&ci->i_truncate_mutex);
1721                 return;
1722         }
1723 
1724         /*
1725          * make sure any dirty snapped pages are flushed before we
1726          * possibly truncate them.. so write AND block!
1727          */
1728         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1729                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1730                      inode);
1731                 spin_unlock(&ci->i_ceph_lock);
1732                 filemap_write_and_wait_range(&inode->i_data, 0,
1733                                              inode->i_sb->s_maxbytes);
1734                 goto retry;
1735         }
1736 
1737         /* there should be no reader or writer */
1738         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1739 
1740         to = ci->i_truncate_size;
1741         wrbuffer_refs = ci->i_wrbuffer_ref;
1742         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1743              ci->i_truncate_pending, to);
1744         spin_unlock(&ci->i_ceph_lock);
1745 
1746         truncate_pagecache(inode, to);
1747 
1748         spin_lock(&ci->i_ceph_lock);
1749         if (to == ci->i_truncate_size) {
1750                 ci->i_truncate_pending = 0;
1751                 finish = 1;
1752         }
1753         spin_unlock(&ci->i_ceph_lock);
1754         if (!finish)
1755                 goto retry;
1756 
1757         mutex_unlock(&ci->i_truncate_mutex);
1758 
1759         if (wrbuffer_refs == 0)
1760                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1761 
1762         wake_up_all(&ci->i_cap_wq);
1763 }
1764 
1765 /*
1766  * symlinks
1767  */
1768 static const struct inode_operations ceph_symlink_iops = {
1769         .readlink = generic_readlink,
1770         .get_link = simple_get_link,
1771         .setattr = ceph_setattr,
1772         .getattr = ceph_getattr,
1773         .setxattr = ceph_setxattr,
1774         .getxattr = ceph_getxattr,
1775         .listxattr = ceph_listxattr,
1776         .removexattr = ceph_removexattr,
1777 };
1778 
1779 /*
1780  * setattr
1781  */
1782 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1783 {
1784         struct inode *inode = d_inode(dentry);
1785         struct ceph_inode_info *ci = ceph_inode(inode);
1786         const unsigned int ia_valid = attr->ia_valid;
1787         struct ceph_mds_request *req;
1788         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1789         struct ceph_cap_flush *prealloc_cf;
1790         int issued;
1791         int release = 0, dirtied = 0;
1792         int mask = 0;
1793         int err = 0;
1794         int inode_dirty_flags = 0;
1795         bool lock_snap_rwsem = false;
1796 
1797         if (ceph_snap(inode) != CEPH_NOSNAP)
1798                 return -EROFS;
1799 
1800         err = inode_change_ok(inode, attr);
1801         if (err != 0)
1802                 return err;
1803 
1804         prealloc_cf = ceph_alloc_cap_flush();
1805         if (!prealloc_cf)
1806                 return -ENOMEM;
1807 
1808         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1809                                        USE_AUTH_MDS);
1810         if (IS_ERR(req)) {
1811                 ceph_free_cap_flush(prealloc_cf);
1812                 return PTR_ERR(req);
1813         }
1814 
1815         spin_lock(&ci->i_ceph_lock);
1816         issued = __ceph_caps_issued(ci, NULL);
1817 
1818         if (!ci->i_head_snapc &&
1819             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
1820                 lock_snap_rwsem = true;
1821                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1822                         spin_unlock(&ci->i_ceph_lock);
1823                         down_read(&mdsc->snap_rwsem);
1824                         spin_lock(&ci->i_ceph_lock);
1825                         issued = __ceph_caps_issued(ci, NULL);
1826                 }
1827         }
1828 
1829         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1830 
1831         if (ia_valid & ATTR_UID) {
1832                 dout("setattr %p uid %d -> %d\n", inode,
1833                      from_kuid(&init_user_ns, inode->i_uid),
1834                      from_kuid(&init_user_ns, attr->ia_uid));
1835                 if (issued & CEPH_CAP_AUTH_EXCL) {
1836                         inode->i_uid = attr->ia_uid;
1837                         dirtied |= CEPH_CAP_AUTH_EXCL;
1838                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1839                            !uid_eq(attr->ia_uid, inode->i_uid)) {
1840                         req->r_args.setattr.uid = cpu_to_le32(
1841                                 from_kuid(&init_user_ns, attr->ia_uid));
1842                         mask |= CEPH_SETATTR_UID;
1843                         release |= CEPH_CAP_AUTH_SHARED;
1844                 }
1845         }
1846         if (ia_valid & ATTR_GID) {
1847                 dout("setattr %p gid %d -> %d\n", inode,
1848                      from_kgid(&init_user_ns, inode->i_gid),
1849                      from_kgid(&init_user_ns, attr->ia_gid));
1850                 if (issued & CEPH_CAP_AUTH_EXCL) {
1851                         inode->i_gid = attr->ia_gid;
1852                         dirtied |= CEPH_CAP_AUTH_EXCL;
1853                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1854                            !gid_eq(attr->ia_gid, inode->i_gid)) {
1855                         req->r_args.setattr.gid = cpu_to_le32(
1856                                 from_kgid(&init_user_ns, attr->ia_gid));
1857                         mask |= CEPH_SETATTR_GID;
1858                         release |= CEPH_CAP_AUTH_SHARED;
1859                 }
1860         }
1861         if (ia_valid & ATTR_MODE) {
1862                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1863                      attr->ia_mode);
1864                 if (issued & CEPH_CAP_AUTH_EXCL) {
1865                         inode->i_mode = attr->ia_mode;
1866                         dirtied |= CEPH_CAP_AUTH_EXCL;
1867                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1868                            attr->ia_mode != inode->i_mode) {
1869                         inode->i_mode = attr->ia_mode;
1870                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1871                         mask |= CEPH_SETATTR_MODE;
1872                         release |= CEPH_CAP_AUTH_SHARED;
1873                 }
1874         }
1875 
1876         if (ia_valid & ATTR_ATIME) {
1877                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1878                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1879                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1880                 if (issued & CEPH_CAP_FILE_EXCL) {
1881                         ci->i_time_warp_seq++;
1882                         inode->i_atime = attr->ia_atime;
1883                         dirtied |= CEPH_CAP_FILE_EXCL;
1884                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1885                            timespec_compare(&inode->i_atime,
1886                                             &attr->ia_atime) < 0) {
1887                         inode->i_atime = attr->ia_atime;
1888                         dirtied |= CEPH_CAP_FILE_WR;
1889                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1890                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1891                         ceph_encode_timespec(&req->r_args.setattr.atime,
1892                                              &attr->ia_atime);
1893                         mask |= CEPH_SETATTR_ATIME;
1894                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1895                                 CEPH_CAP_FILE_WR;
1896                 }
1897         }
1898         if (ia_valid & ATTR_MTIME) {
1899                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1900                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1901                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1902                 if (issued & CEPH_CAP_FILE_EXCL) {
1903                         ci->i_time_warp_seq++;
1904                         inode->i_mtime = attr->ia_mtime;
1905                         dirtied |= CEPH_CAP_FILE_EXCL;
1906                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1907                            timespec_compare(&inode->i_mtime,
1908                                             &attr->ia_mtime) < 0) {
1909                         inode->i_mtime = attr->ia_mtime;
1910                         dirtied |= CEPH_CAP_FILE_WR;
1911                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1912                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1913                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1914                                              &attr->ia_mtime);
1915                         mask |= CEPH_SETATTR_MTIME;
1916                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1917                                 CEPH_CAP_FILE_WR;
1918                 }
1919         }
1920         if (ia_valid & ATTR_SIZE) {
1921                 dout("setattr %p size %lld -> %lld\n", inode,
1922                      inode->i_size, attr->ia_size);
1923                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1924                     attr->ia_size > inode->i_size) {
1925                         i_size_write(inode, attr->ia_size);
1926                         inode->i_blocks =
1927                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1928                         inode->i_ctime = attr->ia_ctime;
1929                         ci->i_reported_size = attr->ia_size;
1930                         dirtied |= CEPH_CAP_FILE_EXCL;
1931                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1932                            attr->ia_size != inode->i_size) {
1933                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1934                         req->r_args.setattr.old_size =
1935                                 cpu_to_le64(inode->i_size);
1936                         mask |= CEPH_SETATTR_SIZE;
1937                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1938                                 CEPH_CAP_FILE_WR;
1939                 }
1940         }
1941 
1942         /* these do nothing */
1943         if (ia_valid & ATTR_CTIME) {
1944                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1945                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1946                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1947                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1948                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1949                      only ? "ctime only" : "ignored");
1950                 inode->i_ctime = attr->ia_ctime;
1951                 if (only) {
1952                         /*
1953                          * if kernel wants to dirty ctime but nothing else,
1954                          * we need to choose a cap to dirty under, or do
1955                          * a almost-no-op setattr
1956                          */
1957                         if (issued & CEPH_CAP_AUTH_EXCL)
1958                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1959                         else if (issued & CEPH_CAP_FILE_EXCL)
1960                                 dirtied |= CEPH_CAP_FILE_EXCL;
1961                         else if (issued & CEPH_CAP_XATTR_EXCL)
1962                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1963                         else
1964                                 mask |= CEPH_SETATTR_CTIME;
1965                 }
1966         }
1967         if (ia_valid & ATTR_FILE)
1968                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1969 
1970         if (dirtied) {
1971                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
1972                                                            &prealloc_cf);
1973                 inode->i_ctime = current_fs_time(inode->i_sb);
1974         }
1975 
1976         release &= issued;
1977         spin_unlock(&ci->i_ceph_lock);
1978         if (lock_snap_rwsem)
1979                 up_read(&mdsc->snap_rwsem);
1980 
1981         if (inode_dirty_flags)
1982                 __mark_inode_dirty(inode, inode_dirty_flags);
1983 
1984         if (ia_valid & ATTR_MODE) {
1985                 err = posix_acl_chmod(inode, attr->ia_mode);
1986                 if (err)
1987                         goto out_put;
1988         }
1989 
1990         if (mask) {
1991                 req->r_inode = inode;
1992                 ihold(inode);
1993                 req->r_inode_drop = release;
1994                 req->r_args.setattr.mask = cpu_to_le32(mask);
1995                 req->r_num_caps = 1;
1996                 err = ceph_mdsc_do_request(mdsc, NULL, req);
1997         }
1998         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1999              ceph_cap_string(dirtied), mask);
2000 
2001         ceph_mdsc_put_request(req);
2002         if (mask & CEPH_SETATTR_SIZE)
2003                 __ceph_do_pending_vmtruncate(inode);
2004         ceph_free_cap_flush(prealloc_cf);
2005         return err;
2006 out_put:
2007         ceph_mdsc_put_request(req);
2008         ceph_free_cap_flush(prealloc_cf);
2009         return err;
2010 }
2011 
2012 /*
2013  * Verify that we have a lease on the given mask.  If not,
2014  * do a getattr against an mds.
2015  */
2016 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2017                       int mask, bool force)
2018 {
2019         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2020         struct ceph_mds_client *mdsc = fsc->mdsc;
2021         struct ceph_mds_request *req;
2022         int err;
2023 
2024         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2025                 dout("do_getattr inode %p SNAPDIR\n", inode);
2026                 return 0;
2027         }
2028 
2029         dout("do_getattr inode %p mask %s mode 0%o\n",
2030              inode, ceph_cap_string(mask), inode->i_mode);
2031         if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2032                 return 0;
2033 
2034         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
2035         if (IS_ERR(req))
2036                 return PTR_ERR(req);
2037         req->r_inode = inode;
2038         ihold(inode);
2039         req->r_num_caps = 1;
2040         req->r_args.getattr.mask = cpu_to_le32(mask);
2041         req->r_locked_page = locked_page;
2042         err = ceph_mdsc_do_request(mdsc, NULL, req);
2043         if (locked_page && err == 0) {
2044                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2045                 if (inline_version == 0) {
2046                         /* the reply is supposed to contain inline data */
2047                         err = -EINVAL;
2048                 } else if (inline_version == CEPH_INLINE_NONE) {
2049                         err = -ENODATA;
2050                 } else {
2051                         err = req->r_reply_info.targeti.inline_len;
2052                 }
2053         }
2054         ceph_mdsc_put_request(req);
2055         dout("do_getattr result=%d\n", err);
2056         return err;
2057 }
2058 
2059 
2060 /*
2061  * Check inode permissions.  We verify we have a valid value for
2062  * the AUTH cap, then call the generic handler.
2063  */
2064 int ceph_permission(struct inode *inode, int mask)
2065 {
2066         int err;
2067 
2068         if (mask & MAY_NOT_BLOCK)
2069                 return -ECHILD;
2070 
2071         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2072 
2073         if (!err)
2074                 err = generic_permission(inode, mask);
2075         return err;
2076 }
2077 
2078 /*
2079  * Get all attributes.  Hopefully somedata we'll have a statlite()
2080  * and can limit the fields we require to be accurate.
2081  */
2082 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
2083                  struct kstat *stat)
2084 {
2085         struct inode *inode = d_inode(dentry);
2086         struct ceph_inode_info *ci = ceph_inode(inode);
2087         int err;
2088 
2089         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
2090         if (!err) {
2091                 generic_fillattr(inode, stat);
2092                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2093                 if (ceph_snap(inode) != CEPH_NOSNAP)
2094                         stat->dev = ceph_snap(inode);
2095                 else
2096                         stat->dev = 0;
2097                 if (S_ISDIR(inode->i_mode)) {
2098                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2099                                                 RBYTES))
2100                                 stat->size = ci->i_rbytes;
2101                         else
2102                                 stat->size = ci->i_files + ci->i_subdirs;
2103                         stat->blocks = 0;
2104                         stat->blksize = 65536;
2105                 }
2106         }
2107         return err;
2108 }
2109 

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