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