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