ceph: properly handle aborted mds requests
[linux-2.6.git] / fs / ceph / inode.c
1 #include "ceph_debug.h"
2
3 #include <linux/module.h>
4 #include <linux/fs.h>
5 #include <linux/smp_lock.h>
6 #include <linux/slab.h>
7 #include <linux/string.h>
8 #include <linux/uaccess.h>
9 #include <linux/kernel.h>
10 #include <linux/namei.h>
11 #include <linux/writeback.h>
12 #include <linux/vmalloc.h>
13
14 #include "super.h"
15 #include "decode.h"
16
17 /*
18  * Ceph inode operations
19  *
20  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
21  * setattr, etc.), xattr helpers, and helpers for assimilating
22  * metadata returned by the MDS into our cache.
23  *
24  * Also define helpers for doing asynchronous writeback, invalidation,
25  * and truncation for the benefit of those who can't afford to block
26  * (typically because they are in the message handler path).
27  */
28
29 static const struct inode_operations ceph_symlink_iops;
30
31 static void ceph_inode_invalidate_pages(struct work_struct *work);
32
33 /*
34  * find or create an inode, given the ceph ino number
35  */
36 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
37 {
38         struct inode *inode;
39         ino_t t = ceph_vino_to_ino(vino);
40
41         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
42         if (inode == NULL)
43                 return ERR_PTR(-ENOMEM);
44         if (inode->i_state & I_NEW) {
45                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
46                      inode, ceph_vinop(inode), (u64)inode->i_ino);
47                 unlock_new_inode(inode);
48         }
49
50         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
51              vino.snap, inode);
52         return inode;
53 }
54
55 /*
56  * get/constuct snapdir inode for a given directory
57  */
58 struct inode *ceph_get_snapdir(struct inode *parent)
59 {
60         struct ceph_vino vino = {
61                 .ino = ceph_ino(parent),
62                 .snap = CEPH_SNAPDIR,
63         };
64         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
65         struct ceph_inode_info *ci = ceph_inode(inode);
66
67         BUG_ON(!S_ISDIR(parent->i_mode));
68         if (IS_ERR(inode))
69                 return ERR_PTR(PTR_ERR(inode));
70         inode->i_mode = parent->i_mode;
71         inode->i_uid = parent->i_uid;
72         inode->i_gid = parent->i_gid;
73         inode->i_op = &ceph_dir_iops;
74         inode->i_fop = &ceph_dir_fops;
75         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
76         ci->i_rbytes = 0;
77         return inode;
78 }
79
80 const struct inode_operations ceph_file_iops = {
81         .permission = ceph_permission,
82         .setattr = ceph_setattr,
83         .getattr = ceph_getattr,
84         .setxattr = ceph_setxattr,
85         .getxattr = ceph_getxattr,
86         .listxattr = ceph_listxattr,
87         .removexattr = ceph_removexattr,
88 };
89
90
91 /*
92  * We use a 'frag tree' to keep track of the MDS's directory fragments
93  * for a given inode (usually there is just a single fragment).  We
94  * need to know when a child frag is delegated to a new MDS, or when
95  * it is flagged as replicated, so we can direct our requests
96  * accordingly.
97  */
98
99 /*
100  * find/create a frag in the tree
101  */
102 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
103                                                     u32 f)
104 {
105         struct rb_node **p;
106         struct rb_node *parent = NULL;
107         struct ceph_inode_frag *frag;
108         int c;
109
110         p = &ci->i_fragtree.rb_node;
111         while (*p) {
112                 parent = *p;
113                 frag = rb_entry(parent, struct ceph_inode_frag, node);
114                 c = ceph_frag_compare(f, frag->frag);
115                 if (c < 0)
116                         p = &(*p)->rb_left;
117                 else if (c > 0)
118                         p = &(*p)->rb_right;
119                 else
120                         return frag;
121         }
122
123         frag = kmalloc(sizeof(*frag), GFP_NOFS);
124         if (!frag) {
125                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
126                        "frag %x\n", &ci->vfs_inode,
127                        ceph_vinop(&ci->vfs_inode), f);
128                 return ERR_PTR(-ENOMEM);
129         }
130         frag->frag = f;
131         frag->split_by = 0;
132         frag->mds = -1;
133         frag->ndist = 0;
134
135         rb_link_node(&frag->node, parent, p);
136         rb_insert_color(&frag->node, &ci->i_fragtree);
137
138         dout("get_or_create_frag added %llx.%llx frag %x\n",
139              ceph_vinop(&ci->vfs_inode), f);
140         return frag;
141 }
142
143 /*
144  * find a specific frag @f
145  */
146 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
147 {
148         struct rb_node *n = ci->i_fragtree.rb_node;
149
150         while (n) {
151                 struct ceph_inode_frag *frag =
152                         rb_entry(n, struct ceph_inode_frag, node);
153                 int c = ceph_frag_compare(f, frag->frag);
154                 if (c < 0)
155                         n = n->rb_left;
156                 else if (c > 0)
157                         n = n->rb_right;
158                 else
159                         return frag;
160         }
161         return NULL;
162 }
163
164 /*
165  * Choose frag containing the given value @v.  If @pfrag is
166  * specified, copy the frag delegation info to the caller if
167  * it is present.
168  */
169 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
170                      struct ceph_inode_frag *pfrag,
171                      int *found)
172 {
173         u32 t = ceph_frag_make(0, 0);
174         struct ceph_inode_frag *frag;
175         unsigned nway, i;
176         u32 n;
177
178         if (found)
179                 *found = 0;
180
181         mutex_lock(&ci->i_fragtree_mutex);
182         while (1) {
183                 WARN_ON(!ceph_frag_contains_value(t, v));
184                 frag = __ceph_find_frag(ci, t);
185                 if (!frag)
186                         break; /* t is a leaf */
187                 if (frag->split_by == 0) {
188                         if (pfrag)
189                                 memcpy(pfrag, frag, sizeof(*pfrag));
190                         if (found)
191                                 *found = 1;
192                         break;
193                 }
194
195                 /* choose child */
196                 nway = 1 << frag->split_by;
197                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
198                      frag->split_by, nway);
199                 for (i = 0; i < nway; i++) {
200                         n = ceph_frag_make_child(t, frag->split_by, i);
201                         if (ceph_frag_contains_value(n, v)) {
202                                 t = n;
203                                 break;
204                         }
205                 }
206                 BUG_ON(i == nway);
207         }
208         dout("choose_frag(%x) = %x\n", v, t);
209
210         mutex_unlock(&ci->i_fragtree_mutex);
211         return t;
212 }
213
214 /*
215  * Process dirfrag (delegation) info from the mds.  Include leaf
216  * fragment in tree ONLY if ndist > 0.  Otherwise, only
217  * branches/splits are included in i_fragtree)
218  */
219 static int ceph_fill_dirfrag(struct inode *inode,
220                              struct ceph_mds_reply_dirfrag *dirinfo)
221 {
222         struct ceph_inode_info *ci = ceph_inode(inode);
223         struct ceph_inode_frag *frag;
224         u32 id = le32_to_cpu(dirinfo->frag);
225         int mds = le32_to_cpu(dirinfo->auth);
226         int ndist = le32_to_cpu(dirinfo->ndist);
227         int i;
228         int err = 0;
229
230         mutex_lock(&ci->i_fragtree_mutex);
231         if (ndist == 0) {
232                 /* no delegation info needed. */
233                 frag = __ceph_find_frag(ci, id);
234                 if (!frag)
235                         goto out;
236                 if (frag->split_by == 0) {
237                         /* tree leaf, remove */
238                         dout("fill_dirfrag removed %llx.%llx frag %x"
239                              " (no ref)\n", ceph_vinop(inode), id);
240                         rb_erase(&frag->node, &ci->i_fragtree);
241                         kfree(frag);
242                 } else {
243                         /* tree branch, keep and clear */
244                         dout("fill_dirfrag cleared %llx.%llx frag %x"
245                              " referral\n", ceph_vinop(inode), id);
246                         frag->mds = -1;
247                         frag->ndist = 0;
248                 }
249                 goto out;
250         }
251
252
253         /* find/add this frag to store mds delegation info */
254         frag = __get_or_create_frag(ci, id);
255         if (IS_ERR(frag)) {
256                 /* this is not the end of the world; we can continue
257                    with bad/inaccurate delegation info */
258                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
259                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
260                 err = -ENOMEM;
261                 goto out;
262         }
263
264         frag->mds = mds;
265         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
266         for (i = 0; i < frag->ndist; i++)
267                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
268         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
269              ceph_vinop(inode), frag->frag, frag->ndist);
270
271 out:
272         mutex_unlock(&ci->i_fragtree_mutex);
273         return err;
274 }
275
276
277 /*
278  * initialize a newly allocated inode.
279  */
280 struct inode *ceph_alloc_inode(struct super_block *sb)
281 {
282         struct ceph_inode_info *ci;
283         int i;
284
285         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
286         if (!ci)
287                 return NULL;
288
289         dout("alloc_inode %p\n", &ci->vfs_inode);
290
291         ci->i_version = 0;
292         ci->i_time_warp_seq = 0;
293         ci->i_ceph_flags = 0;
294         ci->i_release_count = 0;
295         ci->i_symlink = NULL;
296
297         ci->i_fragtree = RB_ROOT;
298         mutex_init(&ci->i_fragtree_mutex);
299
300         ci->i_xattrs.blob = NULL;
301         ci->i_xattrs.prealloc_blob = NULL;
302         ci->i_xattrs.dirty = false;
303         ci->i_xattrs.index = RB_ROOT;
304         ci->i_xattrs.count = 0;
305         ci->i_xattrs.names_size = 0;
306         ci->i_xattrs.vals_size = 0;
307         ci->i_xattrs.version = 0;
308         ci->i_xattrs.index_version = 0;
309
310         ci->i_caps = RB_ROOT;
311         ci->i_auth_cap = NULL;
312         ci->i_dirty_caps = 0;
313         ci->i_flushing_caps = 0;
314         INIT_LIST_HEAD(&ci->i_dirty_item);
315         INIT_LIST_HEAD(&ci->i_flushing_item);
316         ci->i_cap_flush_seq = 0;
317         ci->i_cap_flush_last_tid = 0;
318         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
319         init_waitqueue_head(&ci->i_cap_wq);
320         ci->i_hold_caps_min = 0;
321         ci->i_hold_caps_max = 0;
322         INIT_LIST_HEAD(&ci->i_cap_delay_list);
323         ci->i_cap_exporting_mds = 0;
324         ci->i_cap_exporting_mseq = 0;
325         ci->i_cap_exporting_issued = 0;
326         INIT_LIST_HEAD(&ci->i_cap_snaps);
327         ci->i_head_snapc = NULL;
328         ci->i_snap_caps = 0;
329
330         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
331                 ci->i_nr_by_mode[i] = 0;
332
333         ci->i_truncate_seq = 0;
334         ci->i_truncate_size = 0;
335         ci->i_truncate_pending = 0;
336
337         ci->i_max_size = 0;
338         ci->i_reported_size = 0;
339         ci->i_wanted_max_size = 0;
340         ci->i_requested_max_size = 0;
341
342         ci->i_pin_ref = 0;
343         ci->i_rd_ref = 0;
344         ci->i_rdcache_ref = 0;
345         ci->i_wr_ref = 0;
346         ci->i_wrbuffer_ref = 0;
347         ci->i_wrbuffer_ref_head = 0;
348         ci->i_shared_gen = 0;
349         ci->i_rdcache_gen = 0;
350         ci->i_rdcache_revoking = 0;
351
352         INIT_LIST_HEAD(&ci->i_unsafe_writes);
353         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
354         spin_lock_init(&ci->i_unsafe_lock);
355
356         ci->i_snap_realm = NULL;
357         INIT_LIST_HEAD(&ci->i_snap_realm_item);
358         INIT_LIST_HEAD(&ci->i_snap_flush_item);
359
360         INIT_WORK(&ci->i_wb_work, ceph_inode_writeback);
361         INIT_WORK(&ci->i_pg_inv_work, ceph_inode_invalidate_pages);
362
363         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
364
365         return &ci->vfs_inode;
366 }
367
368 void ceph_destroy_inode(struct inode *inode)
369 {
370         struct ceph_inode_info *ci = ceph_inode(inode);
371         struct ceph_inode_frag *frag;
372         struct rb_node *n;
373
374         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
375
376         ceph_queue_caps_release(inode);
377
378         kfree(ci->i_symlink);
379         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
380                 frag = rb_entry(n, struct ceph_inode_frag, node);
381                 rb_erase(n, &ci->i_fragtree);
382                 kfree(frag);
383         }
384
385         __ceph_destroy_xattrs(ci);
386         if (ci->i_xattrs.blob)
387                 ceph_buffer_put(ci->i_xattrs.blob);
388         if (ci->i_xattrs.prealloc_blob)
389                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
390
391         kmem_cache_free(ceph_inode_cachep, ci);
392 }
393
394
395 /*
396  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
397  * careful because either the client or MDS may have more up to date
398  * info, depending on which capabilities are held, and whether
399  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
400  * and size are monotonically increasing, except when utimes() or
401  * truncate() increments the corresponding _seq values.)
402  */
403 int ceph_fill_file_size(struct inode *inode, int issued,
404                         u32 truncate_seq, u64 truncate_size, u64 size)
405 {
406         struct ceph_inode_info *ci = ceph_inode(inode);
407         int queue_trunc = 0;
408
409         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
410             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
411                 dout("size %lld -> %llu\n", inode->i_size, size);
412                 inode->i_size = size;
413                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
414                 ci->i_reported_size = size;
415                 if (truncate_seq != ci->i_truncate_seq) {
416                         dout("truncate_seq %u -> %u\n",
417                              ci->i_truncate_seq, truncate_seq);
418                         ci->i_truncate_seq = truncate_seq;
419                         if (issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
420                                       CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
421                                       CEPH_CAP_FILE_EXCL)) {
422                                 ci->i_truncate_pending++;
423                                 queue_trunc = 1;
424                         }
425                 }
426         }
427         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
428             ci->i_truncate_size != truncate_size) {
429                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
430                      truncate_size);
431                 ci->i_truncate_size = truncate_size;
432         }
433         return queue_trunc;
434 }
435
436 void ceph_fill_file_time(struct inode *inode, int issued,
437                          u64 time_warp_seq, struct timespec *ctime,
438                          struct timespec *mtime, struct timespec *atime)
439 {
440         struct ceph_inode_info *ci = ceph_inode(inode);
441         int warn = 0;
442
443         if (issued & (CEPH_CAP_FILE_EXCL|
444                       CEPH_CAP_FILE_WR|
445                       CEPH_CAP_FILE_BUFFER)) {
446                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
447                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
448                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
449                              ctime->tv_sec, ctime->tv_nsec);
450                         inode->i_ctime = *ctime;
451                 }
452                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
453                         /* the MDS did a utimes() */
454                         dout("mtime %ld.%09ld -> %ld.%09ld "
455                              "tw %d -> %d\n",
456                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
457                              mtime->tv_sec, mtime->tv_nsec,
458                              ci->i_time_warp_seq, (int)time_warp_seq);
459
460                         inode->i_mtime = *mtime;
461                         inode->i_atime = *atime;
462                         ci->i_time_warp_seq = time_warp_seq;
463                 } else if (time_warp_seq == ci->i_time_warp_seq) {
464                         /* nobody did utimes(); take the max */
465                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
466                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
467                                      inode->i_mtime.tv_sec,
468                                      inode->i_mtime.tv_nsec,
469                                      mtime->tv_sec, mtime->tv_nsec);
470                                 inode->i_mtime = *mtime;
471                         }
472                         if (timespec_compare(atime, &inode->i_atime) > 0) {
473                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
474                                      inode->i_atime.tv_sec,
475                                      inode->i_atime.tv_nsec,
476                                      atime->tv_sec, atime->tv_nsec);
477                                 inode->i_atime = *atime;
478                         }
479                 } else if (issued & CEPH_CAP_FILE_EXCL) {
480                         /* we did a utimes(); ignore mds values */
481                 } else {
482                         warn = 1;
483                 }
484         } else {
485                 /* we have no write caps; whatever the MDS says is true */
486                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
487                         inode->i_ctime = *ctime;
488                         inode->i_mtime = *mtime;
489                         inode->i_atime = *atime;
490                         ci->i_time_warp_seq = time_warp_seq;
491                 } else {
492                         warn = 1;
493                 }
494         }
495         if (warn) /* time_warp_seq shouldn't go backwards */
496                 dout("%p mds time_warp_seq %llu < %u\n",
497                      inode, time_warp_seq, ci->i_time_warp_seq);
498 }
499
500 /*
501  * Populate an inode based on info from mds.  May be called on new or
502  * existing inodes.
503  */
504 static int fill_inode(struct inode *inode,
505                       struct ceph_mds_reply_info_in *iinfo,
506                       struct ceph_mds_reply_dirfrag *dirinfo,
507                       struct ceph_mds_session *session,
508                       unsigned long ttl_from, int cap_fmode,
509                       struct ceph_cap_reservation *caps_reservation)
510 {
511         struct ceph_mds_reply_inode *info = iinfo->in;
512         struct ceph_inode_info *ci = ceph_inode(inode);
513         int i;
514         int issued, implemented;
515         struct timespec mtime, atime, ctime;
516         u32 nsplits;
517         struct ceph_buffer *xattr_blob = NULL;
518         int err = 0;
519         int queue_trunc = 0;
520
521         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
522              inode, ceph_vinop(inode), le64_to_cpu(info->version),
523              ci->i_version);
524
525         /*
526          * prealloc xattr data, if it looks like we'll need it.  only
527          * if len > 4 (meaning there are actually xattrs; the first 4
528          * bytes are the xattr count).
529          */
530         if (iinfo->xattr_len > 4) {
531                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
532                 if (!xattr_blob)
533                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
534                                iinfo->xattr_len);
535         }
536
537         spin_lock(&inode->i_lock);
538
539         /*
540          * provided version will be odd if inode value is projected,
541          * even if stable.  skip the update if we have a newer info
542          * (e.g., due to inode info racing form multiple MDSs), or if
543          * we are getting projected (unstable) inode info.
544          */
545         if (le64_to_cpu(info->version) > 0 &&
546             (ci->i_version & ~1) > le64_to_cpu(info->version))
547                 goto no_change;
548
549         issued = __ceph_caps_issued(ci, &implemented);
550         issued |= implemented | __ceph_caps_dirty(ci);
551
552         /* update inode */
553         ci->i_version = le64_to_cpu(info->version);
554         inode->i_version++;
555         inode->i_rdev = le32_to_cpu(info->rdev);
556
557         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
558                 inode->i_mode = le32_to_cpu(info->mode);
559                 inode->i_uid = le32_to_cpu(info->uid);
560                 inode->i_gid = le32_to_cpu(info->gid);
561                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
562                      inode->i_uid, inode->i_gid);
563         }
564
565         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
566                 inode->i_nlink = le32_to_cpu(info->nlink);
567
568         /* be careful with mtime, atime, size */
569         ceph_decode_timespec(&atime, &info->atime);
570         ceph_decode_timespec(&mtime, &info->mtime);
571         ceph_decode_timespec(&ctime, &info->ctime);
572         queue_trunc = ceph_fill_file_size(inode, issued,
573                                           le32_to_cpu(info->truncate_seq),
574                                           le64_to_cpu(info->truncate_size),
575                                           le64_to_cpu(info->size));
576         ceph_fill_file_time(inode, issued,
577                             le32_to_cpu(info->time_warp_seq),
578                             &ctime, &mtime, &atime);
579
580         ci->i_max_size = le64_to_cpu(info->max_size);
581         ci->i_layout = info->layout;
582         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
583
584         /* xattrs */
585         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
586         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
587             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
588                 if (ci->i_xattrs.blob)
589                         ceph_buffer_put(ci->i_xattrs.blob);
590                 ci->i_xattrs.blob = xattr_blob;
591                 if (xattr_blob)
592                         memcpy(ci->i_xattrs.blob->vec.iov_base,
593                                iinfo->xattr_data, iinfo->xattr_len);
594                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
595         }
596
597         inode->i_mapping->a_ops = &ceph_aops;
598         inode->i_mapping->backing_dev_info =
599                 &ceph_client(inode->i_sb)->backing_dev_info;
600
601         switch (inode->i_mode & S_IFMT) {
602         case S_IFIFO:
603         case S_IFBLK:
604         case S_IFCHR:
605         case S_IFSOCK:
606                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
607                 inode->i_op = &ceph_file_iops;
608                 break;
609         case S_IFREG:
610                 inode->i_op = &ceph_file_iops;
611                 inode->i_fop = &ceph_file_fops;
612                 break;
613         case S_IFLNK:
614                 inode->i_op = &ceph_symlink_iops;
615                 if (!ci->i_symlink) {
616                         int symlen = iinfo->symlink_len;
617                         char *sym;
618
619                         BUG_ON(symlen != inode->i_size);
620                         spin_unlock(&inode->i_lock);
621
622                         err = -ENOMEM;
623                         sym = kmalloc(symlen+1, GFP_NOFS);
624                         if (!sym)
625                                 goto out;
626                         memcpy(sym, iinfo->symlink, symlen);
627                         sym[symlen] = 0;
628
629                         spin_lock(&inode->i_lock);
630                         if (!ci->i_symlink)
631                                 ci->i_symlink = sym;
632                         else
633                                 kfree(sym); /* lost a race */
634                 }
635                 break;
636         case S_IFDIR:
637                 inode->i_op = &ceph_dir_iops;
638                 inode->i_fop = &ceph_dir_fops;
639
640                 ci->i_files = le64_to_cpu(info->files);
641                 ci->i_subdirs = le64_to_cpu(info->subdirs);
642                 ci->i_rbytes = le64_to_cpu(info->rbytes);
643                 ci->i_rfiles = le64_to_cpu(info->rfiles);
644                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
645                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
646
647                 /* set dir completion flag? */
648                 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
649                     ceph_snap(inode) == CEPH_NOSNAP &&
650                     (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED)) {
651                         dout(" marking %p complete (empty)\n", inode);
652                         ci->i_ceph_flags |= CEPH_I_COMPLETE;
653                         ci->i_max_offset = 2;
654                 }
655
656                 /* it may be better to set st_size in getattr instead? */
657                 if (ceph_test_opt(ceph_client(inode->i_sb), RBYTES))
658                         inode->i_size = ci->i_rbytes;
659                 break;
660         default:
661                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
662                        ceph_vinop(inode), inode->i_mode);
663         }
664
665 no_change:
666         spin_unlock(&inode->i_lock);
667
668         /* queue truncate if we saw i_size decrease */
669         if (queue_trunc)
670                 if (queue_work(ceph_client(inode->i_sb)->trunc_wq,
671                                &ci->i_vmtruncate_work))
672                         igrab(inode);
673
674         /* populate frag tree */
675         /* FIXME: move me up, if/when version reflects fragtree changes */
676         nsplits = le32_to_cpu(info->fragtree.nsplits);
677         mutex_lock(&ci->i_fragtree_mutex);
678         for (i = 0; i < nsplits; i++) {
679                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
680                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
681
682                 if (IS_ERR(frag))
683                         continue;
684                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
685                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
686         }
687         mutex_unlock(&ci->i_fragtree_mutex);
688
689         /* were we issued a capability? */
690         if (info->cap.caps) {
691                 if (ceph_snap(inode) == CEPH_NOSNAP) {
692                         ceph_add_cap(inode, session,
693                                      le64_to_cpu(info->cap.cap_id),
694                                      cap_fmode,
695                                      le32_to_cpu(info->cap.caps),
696                                      le32_to_cpu(info->cap.wanted),
697                                      le32_to_cpu(info->cap.seq),
698                                      le32_to_cpu(info->cap.mseq),
699                                      le64_to_cpu(info->cap.realm),
700                                      info->cap.flags,
701                                      caps_reservation);
702                 } else {
703                         spin_lock(&inode->i_lock);
704                         dout(" %p got snap_caps %s\n", inode,
705                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
706                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
707                         if (cap_fmode >= 0)
708                                 __ceph_get_fmode(ci, cap_fmode);
709                         spin_unlock(&inode->i_lock);
710                 }
711         }
712
713         /* update delegation info? */
714         if (dirinfo)
715                 ceph_fill_dirfrag(inode, dirinfo);
716
717         err = 0;
718
719 out:
720         if (xattr_blob)
721                 ceph_buffer_put(xattr_blob);
722         return err;
723 }
724
725 /*
726  * caller should hold session s_mutex.
727  */
728 static void update_dentry_lease(struct dentry *dentry,
729                                 struct ceph_mds_reply_lease *lease,
730                                 struct ceph_mds_session *session,
731                                 unsigned long from_time)
732 {
733         struct ceph_dentry_info *di = ceph_dentry(dentry);
734         long unsigned duration = le32_to_cpu(lease->duration_ms);
735         long unsigned ttl = from_time + (duration * HZ) / 1000;
736         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
737         struct inode *dir;
738
739         /* only track leases on regular dentries */
740         if (dentry->d_op != &ceph_dentry_ops)
741                 return;
742
743         spin_lock(&dentry->d_lock);
744         dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
745              dentry, le16_to_cpu(lease->mask), duration, ttl);
746
747         /* make lease_rdcache_gen match directory */
748         dir = dentry->d_parent->d_inode;
749         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
750
751         if (lease->mask == 0)
752                 goto out_unlock;
753
754         if (di->lease_gen == session->s_cap_gen &&
755             time_before(ttl, dentry->d_time))
756                 goto out_unlock;  /* we already have a newer lease. */
757
758         if (di->lease_session && di->lease_session != session)
759                 goto out_unlock;
760
761         ceph_dentry_lru_touch(dentry);
762
763         if (!di->lease_session)
764                 di->lease_session = ceph_get_mds_session(session);
765         di->lease_gen = session->s_cap_gen;
766         di->lease_seq = le32_to_cpu(lease->seq);
767         di->lease_renew_after = half_ttl;
768         di->lease_renew_from = 0;
769         dentry->d_time = ttl;
770 out_unlock:
771         spin_unlock(&dentry->d_lock);
772         return;
773 }
774
775 /*
776  * splice a dentry to an inode.
777  * caller must hold directory i_mutex for this to be safe.
778  *
779  * we will only rehash the resulting dentry if @prehash is
780  * true; @prehash will be set to false (for the benefit of
781  * the caller) if we fail.
782  */
783 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
784                                     bool *prehash)
785 {
786         struct dentry *realdn;
787
788         /* dn must be unhashed */
789         if (!d_unhashed(dn))
790                 d_drop(dn);
791         realdn = d_materialise_unique(dn, in);
792         if (IS_ERR(realdn)) {
793                 pr_err("splice_dentry error %p inode %p ino %llx.%llx\n",
794                        dn, in, ceph_vinop(in));
795                 if (prehash)
796                         *prehash = false; /* don't rehash on error */
797                 dn = realdn; /* note realdn contains the error */
798                 goto out;
799         } else if (realdn) {
800                 dout("dn %p (%d) spliced with %p (%d) "
801                      "inode %p ino %llx.%llx\n",
802                      dn, atomic_read(&dn->d_count),
803                      realdn, atomic_read(&realdn->d_count),
804                      realdn->d_inode, ceph_vinop(realdn->d_inode));
805                 dput(dn);
806                 dn = realdn;
807         } else {
808                 BUG_ON(!ceph_dentry(dn));
809
810                 dout("dn %p attached to %p ino %llx.%llx\n",
811                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
812         }
813         if ((!prehash || *prehash) && d_unhashed(dn))
814                 d_rehash(dn);
815 out:
816         return dn;
817 }
818
819 /*
820  * Set dentry's directory position based on the current dir's max, and
821  * order it in d_subdirs, so that dcache_readdir behaves.
822  */
823 static void ceph_set_dentry_offset(struct dentry *dn)
824 {
825         struct dentry *dir = dn->d_parent;
826         struct inode *inode = dn->d_parent->d_inode;
827         struct ceph_dentry_info *di;
828
829         BUG_ON(!inode);
830
831         di = ceph_dentry(dn);
832
833         spin_lock(&inode->i_lock);
834         di->offset = ceph_inode(inode)->i_max_offset++;
835         spin_unlock(&inode->i_lock);
836
837         spin_lock(&dcache_lock);
838         spin_lock(&dn->d_lock);
839         list_move_tail(&dir->d_subdirs, &dn->d_u.d_child);
840         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
841              dn->d_u.d_child.prev, dn->d_u.d_child.next);
842         spin_unlock(&dn->d_lock);
843         spin_unlock(&dcache_lock);
844 }
845
846 /*
847  * Incorporate results into the local cache.  This is either just
848  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
849  * after a lookup).
850  *
851  * A reply may contain
852  *         a directory inode along with a dentry.
853  *  and/or a target inode
854  *
855  * Called with snap_rwsem (read).
856  */
857 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
858                     struct ceph_mds_session *session)
859 {
860         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
861         struct inode *in = NULL;
862         struct ceph_mds_reply_inode *ininfo;
863         struct ceph_vino vino;
864         int i = 0;
865         int err = 0;
866
867         dout("fill_trace %p is_dentry %d is_target %d\n", req,
868              rinfo->head->is_dentry, rinfo->head->is_target);
869
870 #if 0
871         /*
872          * Debugging hook:
873          *
874          * If we resend completed ops to a recovering mds, we get no
875          * trace.  Since that is very rare, pretend this is the case
876          * to ensure the 'no trace' handlers in the callers behave.
877          *
878          * Fill in inodes unconditionally to avoid breaking cap
879          * invariants.
880          */
881         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
882                 pr_info("fill_trace faking empty trace on %lld %s\n",
883                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
884                 if (rinfo->head->is_dentry) {
885                         rinfo->head->is_dentry = 0;
886                         err = fill_inode(req->r_locked_dir,
887                                          &rinfo->diri, rinfo->dirfrag,
888                                          session, req->r_request_started, -1);
889                 }
890                 if (rinfo->head->is_target) {
891                         rinfo->head->is_target = 0;
892                         ininfo = rinfo->targeti.in;
893                         vino.ino = le64_to_cpu(ininfo->ino);
894                         vino.snap = le64_to_cpu(ininfo->snapid);
895                         in = ceph_get_inode(sb, vino);
896                         err = fill_inode(in, &rinfo->targeti, NULL,
897                                          session, req->r_request_started,
898                                          req->r_fmode);
899                         iput(in);
900                 }
901         }
902 #endif
903
904         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
905                 dout("fill_trace reply is empty!\n");
906                 if (rinfo->head->result == 0 && req->r_locked_dir) {
907                         struct ceph_inode_info *ci =
908                                 ceph_inode(req->r_locked_dir);
909                         dout(" clearing %p complete (empty trace)\n",
910                              req->r_locked_dir);
911                         ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
912                         ci->i_release_count++;
913                 }
914                 return 0;
915         }
916
917         if (rinfo->head->is_dentry) {
918                 struct inode *dir = req->r_locked_dir;
919
920                 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
921                                  session, req->r_request_started, -1,
922                                  &req->r_caps_reservation);
923                 if (err < 0)
924                         return err;
925         }
926
927         if (rinfo->head->is_dentry && !req->r_aborted) {
928                 /*
929                  * lookup link rename   : null -> possibly existing inode
930                  * mknod symlink mkdir  : null -> new inode
931                  * unlink               : linked -> null
932                  */
933                 struct inode *dir = req->r_locked_dir;
934                 struct dentry *dn = req->r_dentry;
935                 bool have_dir_cap, have_lease;
936
937                 BUG_ON(!dn);
938                 BUG_ON(!dir);
939                 BUG_ON(dn->d_parent->d_inode != dir);
940                 BUG_ON(ceph_ino(dir) !=
941                        le64_to_cpu(rinfo->diri.in->ino));
942                 BUG_ON(ceph_snap(dir) !=
943                        le64_to_cpu(rinfo->diri.in->snapid));
944
945                 /* do we have a lease on the whole dir? */
946                 have_dir_cap =
947                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
948                          CEPH_CAP_FILE_SHARED);
949
950                 /* do we have a dn lease? */
951                 have_lease = have_dir_cap ||
952                         (le16_to_cpu(rinfo->dlease->mask) &
953                          CEPH_LOCK_DN);
954
955                 if (!have_lease)
956                         dout("fill_trace  no dentry lease or dir cap\n");
957
958                 /* rename? */
959                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
960                         dout(" src %p '%.*s' dst %p '%.*s'\n",
961                              req->r_old_dentry,
962                              req->r_old_dentry->d_name.len,
963                              req->r_old_dentry->d_name.name,
964                              dn, dn->d_name.len, dn->d_name.name);
965                         dout("fill_trace doing d_move %p -> %p\n",
966                              req->r_old_dentry, dn);
967                         d_move(req->r_old_dentry, dn);
968                         dout(" src %p '%.*s' dst %p '%.*s'\n",
969                              req->r_old_dentry,
970                              req->r_old_dentry->d_name.len,
971                              req->r_old_dentry->d_name.name,
972                              dn, dn->d_name.len, dn->d_name.name);
973                         /* ensure target dentry is invalidated, despite
974                            rehashing bug in vfs_rename_dir */
975                         dn->d_time = jiffies;
976                         ceph_dentry(dn)->lease_shared_gen = 0;
977                         /* take overwritten dentry's readdir offset */
978                         ceph_dentry(req->r_old_dentry)->offset =
979                                 ceph_dentry(dn)->offset;
980                         dn = req->r_old_dentry;  /* use old_dentry */
981                         in = dn->d_inode;
982                 }
983
984                 /* null dentry? */
985                 if (!rinfo->head->is_target) {
986                         dout("fill_trace null dentry\n");
987                         if (dn->d_inode) {
988                                 dout("d_delete %p\n", dn);
989                                 d_delete(dn);
990                         } else {
991                                 dout("d_instantiate %p NULL\n", dn);
992                                 d_instantiate(dn, NULL);
993                                 if (have_lease && d_unhashed(dn))
994                                         d_rehash(dn);
995                                 update_dentry_lease(dn, rinfo->dlease,
996                                                     session,
997                                                     req->r_request_started);
998                         }
999                         goto done;
1000                 }
1001
1002                 /* attach proper inode */
1003                 ininfo = rinfo->targeti.in;
1004                 vino.ino = le64_to_cpu(ininfo->ino);
1005                 vino.snap = le64_to_cpu(ininfo->snapid);
1006                 if (!dn->d_inode) {
1007                         in = ceph_get_inode(sb, vino);
1008                         if (IS_ERR(in)) {
1009                                 pr_err("fill_trace bad get_inode "
1010                                        "%llx.%llx\n", vino.ino, vino.snap);
1011                                 err = PTR_ERR(in);
1012                                 d_delete(dn);
1013                                 goto done;
1014                         }
1015                         dn = splice_dentry(dn, in, &have_lease);
1016                         if (IS_ERR(dn)) {
1017                                 err = PTR_ERR(dn);
1018                                 goto done;
1019                         }
1020                         req->r_dentry = dn;  /* may have spliced */
1021                         ceph_set_dentry_offset(dn);
1022                         igrab(in);
1023                 } else if (ceph_ino(in) == vino.ino &&
1024                            ceph_snap(in) == vino.snap) {
1025                         igrab(in);
1026                 } else {
1027                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1028                              dn, in, ceph_ino(in), ceph_snap(in),
1029                              vino.ino, vino.snap);
1030                         have_lease = false;
1031                         in = NULL;
1032                 }
1033
1034                 if (have_lease)
1035                         update_dentry_lease(dn, rinfo->dlease, session,
1036                                             req->r_request_started);
1037                 dout(" final dn %p\n", dn);
1038                 i++;
1039         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1040                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1041                 struct dentry *dn = req->r_dentry;
1042
1043                 /* fill out a snapdir LOOKUPSNAP dentry */
1044                 BUG_ON(!dn);
1045                 BUG_ON(!req->r_locked_dir);
1046                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1047                 ininfo = rinfo->targeti.in;
1048                 vino.ino = le64_to_cpu(ininfo->ino);
1049                 vino.snap = le64_to_cpu(ininfo->snapid);
1050                 in = ceph_get_inode(sb, vino);
1051                 if (IS_ERR(in)) {
1052                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1053                                vino.ino, vino.snap);
1054                         err = PTR_ERR(in);
1055                         d_delete(dn);
1056                         goto done;
1057                 }
1058                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1059                 dn = splice_dentry(dn, in, NULL);
1060                 if (IS_ERR(dn)) {
1061                         err = PTR_ERR(dn);
1062                         goto done;
1063                 }
1064                 ceph_set_dentry_offset(dn);
1065                 req->r_dentry = dn;  /* may have spliced */
1066                 igrab(in);
1067                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1068         }
1069
1070         if (rinfo->head->is_target) {
1071                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1072                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1073
1074                 if (in == NULL || ceph_ino(in) != vino.ino ||
1075                     ceph_snap(in) != vino.snap) {
1076                         in = ceph_get_inode(sb, vino);
1077                         if (IS_ERR(in)) {
1078                                 err = PTR_ERR(in);
1079                                 goto done;
1080                         }
1081                 }
1082                 req->r_target_inode = in;
1083
1084                 err = fill_inode(in,
1085                                  &rinfo->targeti, NULL,
1086                                  session, req->r_request_started,
1087                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1088                                  req->r_fmode : -1,
1089                                  &req->r_caps_reservation);
1090                 if (err < 0) {
1091                         pr_err("fill_inode badness %p %llx.%llx\n",
1092                                in, ceph_vinop(in));
1093                         goto done;
1094                 }
1095         }
1096
1097 done:
1098         dout("fill_trace done err=%d\n", err);
1099         return err;
1100 }
1101
1102 /*
1103  * Prepopulate our cache with readdir results, leases, etc.
1104  */
1105 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1106                              struct ceph_mds_session *session)
1107 {
1108         struct dentry *parent = req->r_dentry;
1109         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1110         struct qstr dname;
1111         struct dentry *dn;
1112         struct inode *in;
1113         int err = 0, i;
1114         struct inode *snapdir = NULL;
1115         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1116         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1117         struct ceph_dentry_info *di;
1118
1119         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1120                 snapdir = ceph_get_snapdir(parent->d_inode);
1121                 parent = d_find_alias(snapdir);
1122                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1123                      rinfo->dir_nr, parent);
1124         } else {
1125                 dout("readdir_prepopulate %d items under dn %p\n",
1126                      rinfo->dir_nr, parent);
1127                 if (rinfo->dir_dir)
1128                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1129         }
1130
1131         for (i = 0; i < rinfo->dir_nr; i++) {
1132                 struct ceph_vino vino;
1133
1134                 dname.name = rinfo->dir_dname[i];
1135                 dname.len = rinfo->dir_dname_len[i];
1136                 dname.hash = full_name_hash(dname.name, dname.len);
1137
1138                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1139                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1140
1141 retry_lookup:
1142                 dn = d_lookup(parent, &dname);
1143                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1144                      parent, dname.len, dname.name, dn);
1145
1146                 if (!dn) {
1147                         dn = d_alloc(parent, &dname);
1148                         dout("d_alloc %p '%.*s' = %p\n", parent,
1149                              dname.len, dname.name, dn);
1150                         if (dn == NULL) {
1151                                 dout("d_alloc badness\n");
1152                                 err = -ENOMEM;
1153                                 goto out;
1154                         }
1155                         err = ceph_init_dentry(dn);
1156                         if (err < 0)
1157                                 goto out;
1158                 } else if (dn->d_inode &&
1159                            (ceph_ino(dn->d_inode) != vino.ino ||
1160                             ceph_snap(dn->d_inode) != vino.snap)) {
1161                         dout(" dn %p points to wrong inode %p\n",
1162                              dn, dn->d_inode);
1163                         d_delete(dn);
1164                         dput(dn);
1165                         goto retry_lookup;
1166                 } else {
1167                         /* reorder parent's d_subdirs */
1168                         spin_lock(&dcache_lock);
1169                         spin_lock(&dn->d_lock);
1170                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1171                         spin_unlock(&dn->d_lock);
1172                         spin_unlock(&dcache_lock);
1173                 }
1174
1175                 di = dn->d_fsdata;
1176                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1177
1178                 /* inode */
1179                 if (dn->d_inode) {
1180                         in = dn->d_inode;
1181                 } else {
1182                         in = ceph_get_inode(parent->d_sb, vino);
1183                         if (in == NULL) {
1184                                 dout("new_inode badness\n");
1185                                 d_delete(dn);
1186                                 dput(dn);
1187                                 err = -ENOMEM;
1188                                 goto out;
1189                         }
1190                         dn = splice_dentry(dn, in, NULL);
1191                 }
1192
1193                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1194                                req->r_request_started, -1,
1195                                &req->r_caps_reservation) < 0) {
1196                         pr_err("fill_inode badness on %p\n", in);
1197                         dput(dn);
1198                         continue;
1199                 }
1200                 update_dentry_lease(dn, rinfo->dir_dlease[i],
1201                                     req->r_session, req->r_request_started);
1202                 dput(dn);
1203         }
1204         req->r_did_prepopulate = true;
1205
1206 out:
1207         if (snapdir) {
1208                 iput(snapdir);
1209                 dput(parent);
1210         }
1211         dout("readdir_prepopulate done\n");
1212         return err;
1213 }
1214
1215 int ceph_inode_set_size(struct inode *inode, loff_t size)
1216 {
1217         struct ceph_inode_info *ci = ceph_inode(inode);
1218         int ret = 0;
1219
1220         spin_lock(&inode->i_lock);
1221         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1222         inode->i_size = size;
1223         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1224
1225         /* tell the MDS if we are approaching max_size */
1226         if ((size << 1) >= ci->i_max_size &&
1227             (ci->i_reported_size << 1) < ci->i_max_size)
1228                 ret = 1;
1229
1230         spin_unlock(&inode->i_lock);
1231         return ret;
1232 }
1233
1234 /*
1235  * Write back inode data in a worker thread.  (This can't be done
1236  * in the message handler context.)
1237  */
1238 void ceph_inode_writeback(struct work_struct *work)
1239 {
1240         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1241                                                   i_wb_work);
1242         struct inode *inode = &ci->vfs_inode;
1243
1244         dout("writeback %p\n", inode);
1245         filemap_fdatawrite(&inode->i_data);
1246         iput(inode);
1247 }
1248
1249 /*
1250  * Invalidate inode pages in a worker thread.  (This can't be done
1251  * in the message handler context.)
1252  */
1253 static void ceph_inode_invalidate_pages(struct work_struct *work)
1254 {
1255         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1256                                                   i_pg_inv_work);
1257         struct inode *inode = &ci->vfs_inode;
1258         u32 orig_gen;
1259         int check = 0;
1260
1261         spin_lock(&inode->i_lock);
1262         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1263              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1264         if (ci->i_rdcache_gen == 0 ||
1265             ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1266                 BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen);
1267                 /* nevermind! */
1268                 ci->i_rdcache_revoking = 0;
1269                 spin_unlock(&inode->i_lock);
1270                 goto out;
1271         }
1272         orig_gen = ci->i_rdcache_gen;
1273         spin_unlock(&inode->i_lock);
1274
1275         truncate_inode_pages(&inode->i_data, 0);
1276
1277         spin_lock(&inode->i_lock);
1278         if (orig_gen == ci->i_rdcache_gen) {
1279                 dout("invalidate_pages %p gen %d successful\n", inode,
1280                      ci->i_rdcache_gen);
1281                 ci->i_rdcache_gen = 0;
1282                 ci->i_rdcache_revoking = 0;
1283                 check = 1;
1284         } else {
1285                 dout("invalidate_pages %p gen %d raced, gen now %d\n",
1286                      inode, orig_gen, ci->i_rdcache_gen);
1287         }
1288         spin_unlock(&inode->i_lock);
1289
1290         if (check)
1291                 ceph_check_caps(ci, 0, NULL);
1292 out:
1293         iput(inode);
1294 }
1295
1296
1297 /*
1298  * called by trunc_wq; take i_mutex ourselves
1299  *
1300  * We also truncate in a separate thread as well.
1301  */
1302 void ceph_vmtruncate_work(struct work_struct *work)
1303 {
1304         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1305                                                   i_vmtruncate_work);
1306         struct inode *inode = &ci->vfs_inode;
1307
1308         dout("vmtruncate_work %p\n", inode);
1309         mutex_lock(&inode->i_mutex);
1310         __ceph_do_pending_vmtruncate(inode);
1311         mutex_unlock(&inode->i_mutex);
1312         iput(inode);
1313 }
1314
1315 /*
1316  * called with i_mutex held.
1317  *
1318  * Make sure any pending truncation is applied before doing anything
1319  * that may depend on it.
1320  */
1321 void __ceph_do_pending_vmtruncate(struct inode *inode)
1322 {
1323         struct ceph_inode_info *ci = ceph_inode(inode);
1324         u64 to;
1325         int wrbuffer_refs, wake = 0;
1326
1327 retry:
1328         spin_lock(&inode->i_lock);
1329         if (ci->i_truncate_pending == 0) {
1330                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1331                 spin_unlock(&inode->i_lock);
1332                 return;
1333         }
1334
1335         /*
1336          * make sure any dirty snapped pages are flushed before we
1337          * possibly truncate them.. so write AND block!
1338          */
1339         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1340                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1341                      inode);
1342                 spin_unlock(&inode->i_lock);
1343                 filemap_write_and_wait_range(&inode->i_data, 0,
1344                                              inode->i_sb->s_maxbytes);
1345                 goto retry;
1346         }
1347
1348         to = ci->i_truncate_size;
1349         wrbuffer_refs = ci->i_wrbuffer_ref;
1350         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1351              ci->i_truncate_pending, to);
1352         spin_unlock(&inode->i_lock);
1353
1354         truncate_inode_pages(inode->i_mapping, to);
1355
1356         spin_lock(&inode->i_lock);
1357         ci->i_truncate_pending--;
1358         if (ci->i_truncate_pending == 0)
1359                 wake = 1;
1360         spin_unlock(&inode->i_lock);
1361
1362         if (wrbuffer_refs == 0)
1363                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1364         if (wake)
1365                 wake_up(&ci->i_cap_wq);
1366 }
1367
1368
1369 /*
1370  * symlinks
1371  */
1372 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1373 {
1374         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1375         nd_set_link(nd, ci->i_symlink);
1376         return NULL;
1377 }
1378
1379 static const struct inode_operations ceph_symlink_iops = {
1380         .readlink = generic_readlink,
1381         .follow_link = ceph_sym_follow_link,
1382 };
1383
1384 /*
1385  * setattr
1386  */
1387 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1388 {
1389         struct inode *inode = dentry->d_inode;
1390         struct ceph_inode_info *ci = ceph_inode(inode);
1391         struct inode *parent_inode = dentry->d_parent->d_inode;
1392         const unsigned int ia_valid = attr->ia_valid;
1393         struct ceph_mds_request *req;
1394         struct ceph_mds_client *mdsc = &ceph_client(dentry->d_sb)->mdsc;
1395         int issued;
1396         int release = 0, dirtied = 0;
1397         int mask = 0;
1398         int err = 0;
1399         int queue_trunc = 0;
1400
1401         if (ceph_snap(inode) != CEPH_NOSNAP)
1402                 return -EROFS;
1403
1404         __ceph_do_pending_vmtruncate(inode);
1405
1406         err = inode_change_ok(inode, attr);
1407         if (err != 0)
1408                 return err;
1409
1410         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1411                                        USE_AUTH_MDS);
1412         if (IS_ERR(req))
1413                 return PTR_ERR(req);
1414
1415         spin_lock(&inode->i_lock);
1416         issued = __ceph_caps_issued(ci, NULL);
1417         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1418
1419         if (ia_valid & ATTR_UID) {
1420                 dout("setattr %p uid %d -> %d\n", inode,
1421                      inode->i_uid, attr->ia_uid);
1422                 if (issued & CEPH_CAP_AUTH_EXCL) {
1423                         inode->i_uid = attr->ia_uid;
1424                         dirtied |= CEPH_CAP_AUTH_EXCL;
1425                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1426                            attr->ia_uid != inode->i_uid) {
1427                         req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1428                         mask |= CEPH_SETATTR_UID;
1429                         release |= CEPH_CAP_AUTH_SHARED;
1430                 }
1431         }
1432         if (ia_valid & ATTR_GID) {
1433                 dout("setattr %p gid %d -> %d\n", inode,
1434                      inode->i_gid, attr->ia_gid);
1435                 if (issued & CEPH_CAP_AUTH_EXCL) {
1436                         inode->i_gid = attr->ia_gid;
1437                         dirtied |= CEPH_CAP_AUTH_EXCL;
1438                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1439                            attr->ia_gid != inode->i_gid) {
1440                         req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1441                         mask |= CEPH_SETATTR_GID;
1442                         release |= CEPH_CAP_AUTH_SHARED;
1443                 }
1444         }
1445         if (ia_valid & ATTR_MODE) {
1446                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1447                      attr->ia_mode);
1448                 if (issued & CEPH_CAP_AUTH_EXCL) {
1449                         inode->i_mode = attr->ia_mode;
1450                         dirtied |= CEPH_CAP_AUTH_EXCL;
1451                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1452                            attr->ia_mode != inode->i_mode) {
1453                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1454                         mask |= CEPH_SETATTR_MODE;
1455                         release |= CEPH_CAP_AUTH_SHARED;
1456                 }
1457         }
1458
1459         if (ia_valid & ATTR_ATIME) {
1460                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1461                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1462                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1463                 if (issued & CEPH_CAP_FILE_EXCL) {
1464                         ci->i_time_warp_seq++;
1465                         inode->i_atime = attr->ia_atime;
1466                         dirtied |= CEPH_CAP_FILE_EXCL;
1467                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1468                            timespec_compare(&inode->i_atime,
1469                                             &attr->ia_atime) < 0) {
1470                         inode->i_atime = attr->ia_atime;
1471                         dirtied |= CEPH_CAP_FILE_WR;
1472                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1473                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1474                         ceph_encode_timespec(&req->r_args.setattr.atime,
1475                                              &attr->ia_atime);
1476                         mask |= CEPH_SETATTR_ATIME;
1477                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1478                                 CEPH_CAP_FILE_WR;
1479                 }
1480         }
1481         if (ia_valid & ATTR_MTIME) {
1482                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1483                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1484                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1485                 if (issued & CEPH_CAP_FILE_EXCL) {
1486                         ci->i_time_warp_seq++;
1487                         inode->i_mtime = attr->ia_mtime;
1488                         dirtied |= CEPH_CAP_FILE_EXCL;
1489                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1490                            timespec_compare(&inode->i_mtime,
1491                                             &attr->ia_mtime) < 0) {
1492                         inode->i_mtime = attr->ia_mtime;
1493                         dirtied |= CEPH_CAP_FILE_WR;
1494                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1495                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1496                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1497                                              &attr->ia_mtime);
1498                         mask |= CEPH_SETATTR_MTIME;
1499                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1500                                 CEPH_CAP_FILE_WR;
1501                 }
1502         }
1503         if (ia_valid & ATTR_SIZE) {
1504                 dout("setattr %p size %lld -> %lld\n", inode,
1505                      inode->i_size, attr->ia_size);
1506                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1507                         err = -EINVAL;
1508                         goto out;
1509                 }
1510                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1511                     attr->ia_size > inode->i_size) {
1512                         inode->i_size = attr->ia_size;
1513                         if (attr->ia_size < inode->i_size) {
1514                                 ci->i_truncate_size = attr->ia_size;
1515                                 ci->i_truncate_pending++;
1516                                 queue_trunc = 1;
1517                         }
1518                         inode->i_blocks =
1519                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1520                         inode->i_ctime = attr->ia_ctime;
1521                         ci->i_reported_size = attr->ia_size;
1522                         dirtied |= CEPH_CAP_FILE_EXCL;
1523                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1524                            attr->ia_size != inode->i_size) {
1525                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1526                         req->r_args.setattr.old_size =
1527                                 cpu_to_le64(inode->i_size);
1528                         mask |= CEPH_SETATTR_SIZE;
1529                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1530                                 CEPH_CAP_FILE_WR;
1531                 }
1532         }
1533
1534         /* these do nothing */
1535         if (ia_valid & ATTR_CTIME) {
1536                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1537                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1538                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1539                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1540                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1541                      only ? "ctime only" : "ignored");
1542                 inode->i_ctime = attr->ia_ctime;
1543                 if (only) {
1544                         /*
1545                          * if kernel wants to dirty ctime but nothing else,
1546                          * we need to choose a cap to dirty under, or do
1547                          * a almost-no-op setattr
1548                          */
1549                         if (issued & CEPH_CAP_AUTH_EXCL)
1550                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1551                         else if (issued & CEPH_CAP_FILE_EXCL)
1552                                 dirtied |= CEPH_CAP_FILE_EXCL;
1553                         else if (issued & CEPH_CAP_XATTR_EXCL)
1554                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1555                         else
1556                                 mask |= CEPH_SETATTR_CTIME;
1557                 }
1558         }
1559         if (ia_valid & ATTR_FILE)
1560                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1561
1562         if (dirtied) {
1563                 __ceph_mark_dirty_caps(ci, dirtied);
1564                 inode->i_ctime = CURRENT_TIME;
1565         }
1566
1567         release &= issued;
1568         spin_unlock(&inode->i_lock);
1569
1570         if (queue_trunc)
1571                 __ceph_do_pending_vmtruncate(inode);
1572
1573         if (mask) {
1574                 req->r_inode = igrab(inode);
1575                 req->r_inode_drop = release;
1576                 req->r_args.setattr.mask = cpu_to_le32(mask);
1577                 req->r_num_caps = 1;
1578                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1579         }
1580         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1581              ceph_cap_string(dirtied), mask);
1582
1583         ceph_mdsc_put_request(req);
1584         __ceph_do_pending_vmtruncate(inode);
1585         return err;
1586 out:
1587         spin_unlock(&inode->i_lock);
1588         ceph_mdsc_put_request(req);
1589         return err;
1590 }
1591
1592 /*
1593  * Verify that we have a lease on the given mask.  If not,
1594  * do a getattr against an mds.
1595  */
1596 int ceph_do_getattr(struct inode *inode, int mask)
1597 {
1598         struct ceph_client *client = ceph_sb_to_client(inode->i_sb);
1599         struct ceph_mds_client *mdsc = &client->mdsc;
1600         struct ceph_mds_request *req;
1601         int err;
1602
1603         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1604                 dout("do_getattr inode %p SNAPDIR\n", inode);
1605                 return 0;
1606         }
1607
1608         dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask));
1609         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1610                 return 0;
1611
1612         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1613         if (IS_ERR(req))
1614                 return PTR_ERR(req);
1615         req->r_inode = igrab(inode);
1616         req->r_num_caps = 1;
1617         req->r_args.getattr.mask = cpu_to_le32(mask);
1618         err = ceph_mdsc_do_request(mdsc, NULL, req);
1619         ceph_mdsc_put_request(req);
1620         dout("do_getattr result=%d\n", err);
1621         return err;
1622 }
1623
1624
1625 /*
1626  * Check inode permissions.  We verify we have a valid value for
1627  * the AUTH cap, then call the generic handler.
1628  */
1629 int ceph_permission(struct inode *inode, int mask)
1630 {
1631         int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1632
1633         if (!err)
1634                 err = generic_permission(inode, mask, NULL);
1635         return err;
1636 }
1637
1638 /*
1639  * Get all attributes.  Hopefully somedata we'll have a statlite()
1640  * and can limit the fields we require to be accurate.
1641  */
1642 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1643                  struct kstat *stat)
1644 {
1645         struct inode *inode = dentry->d_inode;
1646         struct ceph_inode_info *ci = ceph_inode(inode);
1647         int err;
1648
1649         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1650         if (!err) {
1651                 generic_fillattr(inode, stat);
1652                 stat->ino = inode->i_ino;
1653                 if (ceph_snap(inode) != CEPH_NOSNAP)
1654                         stat->dev = ceph_snap(inode);
1655                 else
1656                         stat->dev = 0;
1657                 if (S_ISDIR(inode->i_mode)) {
1658                         stat->size = ci->i_rbytes;
1659                         stat->blocks = 0;
1660                         stat->blksize = 65536;
1661                 }
1662         }
1663         return err;
1664 }