xref: /openbmc/linux/fs/ceph/caps.c (revision 2600d2dd)
1a8599bd8SSage Weil #include "ceph_debug.h"
2a8599bd8SSage Weil 
3a8599bd8SSage Weil #include <linux/fs.h>
4a8599bd8SSage Weil #include <linux/kernel.h>
5a8599bd8SSage Weil #include <linux/sched.h>
6a8599bd8SSage Weil #include <linux/vmalloc.h>
7a8599bd8SSage Weil #include <linux/wait.h>
8a8599bd8SSage Weil 
9a8599bd8SSage Weil #include "super.h"
10a8599bd8SSage Weil #include "decode.h"
11a8599bd8SSage Weil #include "messenger.h"
12a8599bd8SSage Weil 
13a8599bd8SSage Weil /*
14a8599bd8SSage Weil  * Capability management
15a8599bd8SSage Weil  *
16a8599bd8SSage Weil  * The Ceph metadata servers control client access to inode metadata
17a8599bd8SSage Weil  * and file data by issuing capabilities, granting clients permission
18a8599bd8SSage Weil  * to read and/or write both inode field and file data to OSDs
19a8599bd8SSage Weil  * (storage nodes).  Each capability consists of a set of bits
20a8599bd8SSage Weil  * indicating which operations are allowed.
21a8599bd8SSage Weil  *
22a8599bd8SSage Weil  * If the client holds a *_SHARED cap, the client has a coherent value
23a8599bd8SSage Weil  * that can be safely read from the cached inode.
24a8599bd8SSage Weil  *
25a8599bd8SSage Weil  * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
26a8599bd8SSage Weil  * client is allowed to change inode attributes (e.g., file size,
27a8599bd8SSage Weil  * mtime), note its dirty state in the ceph_cap, and asynchronously
28a8599bd8SSage Weil  * flush that metadata change to the MDS.
29a8599bd8SSage Weil  *
30a8599bd8SSage Weil  * In the event of a conflicting operation (perhaps by another
31a8599bd8SSage Weil  * client), the MDS will revoke the conflicting client capabilities.
32a8599bd8SSage Weil  *
33a8599bd8SSage Weil  * In order for a client to cache an inode, it must hold a capability
34a8599bd8SSage Weil  * with at least one MDS server.  When inodes are released, release
35a8599bd8SSage Weil  * notifications are batched and periodically sent en masse to the MDS
36a8599bd8SSage Weil  * cluster to release server state.
37a8599bd8SSage Weil  */
38a8599bd8SSage Weil 
39a8599bd8SSage Weil 
40a8599bd8SSage Weil /*
41a8599bd8SSage Weil  * Generate readable cap strings for debugging output.
42a8599bd8SSage Weil  */
43a8599bd8SSage Weil #define MAX_CAP_STR 20
44a8599bd8SSage Weil static char cap_str[MAX_CAP_STR][40];
45a8599bd8SSage Weil static DEFINE_SPINLOCK(cap_str_lock);
46a8599bd8SSage Weil static int last_cap_str;
47a8599bd8SSage Weil 
48a8599bd8SSage Weil static char *gcap_string(char *s, int c)
49a8599bd8SSage Weil {
50a8599bd8SSage Weil 	if (c & CEPH_CAP_GSHARED)
51a8599bd8SSage Weil 		*s++ = 's';
52a8599bd8SSage Weil 	if (c & CEPH_CAP_GEXCL)
53a8599bd8SSage Weil 		*s++ = 'x';
54a8599bd8SSage Weil 	if (c & CEPH_CAP_GCACHE)
55a8599bd8SSage Weil 		*s++ = 'c';
56a8599bd8SSage Weil 	if (c & CEPH_CAP_GRD)
57a8599bd8SSage Weil 		*s++ = 'r';
58a8599bd8SSage Weil 	if (c & CEPH_CAP_GWR)
59a8599bd8SSage Weil 		*s++ = 'w';
60a8599bd8SSage Weil 	if (c & CEPH_CAP_GBUFFER)
61a8599bd8SSage Weil 		*s++ = 'b';
62a8599bd8SSage Weil 	if (c & CEPH_CAP_GLAZYIO)
63a8599bd8SSage Weil 		*s++ = 'l';
64a8599bd8SSage Weil 	return s;
65a8599bd8SSage Weil }
66a8599bd8SSage Weil 
67a8599bd8SSage Weil const char *ceph_cap_string(int caps)
68a8599bd8SSage Weil {
69a8599bd8SSage Weil 	int i;
70a8599bd8SSage Weil 	char *s;
71a8599bd8SSage Weil 	int c;
72a8599bd8SSage Weil 
73a8599bd8SSage Weil 	spin_lock(&cap_str_lock);
74a8599bd8SSage Weil 	i = last_cap_str++;
75a8599bd8SSage Weil 	if (last_cap_str == MAX_CAP_STR)
76a8599bd8SSage Weil 		last_cap_str = 0;
77a8599bd8SSage Weil 	spin_unlock(&cap_str_lock);
78a8599bd8SSage Weil 
79a8599bd8SSage Weil 	s = cap_str[i];
80a8599bd8SSage Weil 
81a8599bd8SSage Weil 	if (caps & CEPH_CAP_PIN)
82a8599bd8SSage Weil 		*s++ = 'p';
83a8599bd8SSage Weil 
84a8599bd8SSage Weil 	c = (caps >> CEPH_CAP_SAUTH) & 3;
85a8599bd8SSage Weil 	if (c) {
86a8599bd8SSage Weil 		*s++ = 'A';
87a8599bd8SSage Weil 		s = gcap_string(s, c);
88a8599bd8SSage Weil 	}
89a8599bd8SSage Weil 
90a8599bd8SSage Weil 	c = (caps >> CEPH_CAP_SLINK) & 3;
91a8599bd8SSage Weil 	if (c) {
92a8599bd8SSage Weil 		*s++ = 'L';
93a8599bd8SSage Weil 		s = gcap_string(s, c);
94a8599bd8SSage Weil 	}
95a8599bd8SSage Weil 
96a8599bd8SSage Weil 	c = (caps >> CEPH_CAP_SXATTR) & 3;
97a8599bd8SSage Weil 	if (c) {
98a8599bd8SSage Weil 		*s++ = 'X';
99a8599bd8SSage Weil 		s = gcap_string(s, c);
100a8599bd8SSage Weil 	}
101a8599bd8SSage Weil 
102a8599bd8SSage Weil 	c = caps >> CEPH_CAP_SFILE;
103a8599bd8SSage Weil 	if (c) {
104a8599bd8SSage Weil 		*s++ = 'F';
105a8599bd8SSage Weil 		s = gcap_string(s, c);
106a8599bd8SSage Weil 	}
107a8599bd8SSage Weil 
108a8599bd8SSage Weil 	if (s == cap_str[i])
109a8599bd8SSage Weil 		*s++ = '-';
110a8599bd8SSage Weil 	*s = 0;
111a8599bd8SSage Weil 	return cap_str[i];
112a8599bd8SSage Weil }
113a8599bd8SSage Weil 
114a8599bd8SSage Weil /*
115a8599bd8SSage Weil  * Cap reservations
116a8599bd8SSage Weil  *
117a8599bd8SSage Weil  * Maintain a global pool of preallocated struct ceph_caps, referenced
118a8599bd8SSage Weil  * by struct ceph_caps_reservations.  This ensures that we preallocate
119a8599bd8SSage Weil  * memory needed to successfully process an MDS response.  (If an MDS
120a8599bd8SSage Weil  * sends us cap information and we fail to process it, we will have
121a8599bd8SSage Weil  * problems due to the client and MDS being out of sync.)
122a8599bd8SSage Weil  *
123a8599bd8SSage Weil  * Reservations are 'owned' by a ceph_cap_reservation context.
124a8599bd8SSage Weil  */
125a8599bd8SSage Weil static spinlock_t caps_list_lock;
126a8599bd8SSage Weil static struct list_head caps_list;  /* unused (reserved or unreserved) */
127a8599bd8SSage Weil static int caps_total_count;        /* total caps allocated */
128a8599bd8SSage Weil static int caps_use_count;          /* in use */
129a8599bd8SSage Weil static int caps_reserve_count;      /* unused, reserved */
130a8599bd8SSage Weil static int caps_avail_count;        /* unused, unreserved */
13185ccce43SSage Weil static int caps_min_count;          /* keep at least this many (unreserved) */
132a8599bd8SSage Weil 
133a8599bd8SSage Weil void __init ceph_caps_init(void)
134a8599bd8SSage Weil {
135a8599bd8SSage Weil 	INIT_LIST_HEAD(&caps_list);
136a8599bd8SSage Weil 	spin_lock_init(&caps_list_lock);
137a8599bd8SSage Weil }
138a8599bd8SSage Weil 
139a8599bd8SSage Weil void ceph_caps_finalize(void)
140a8599bd8SSage Weil {
141a8599bd8SSage Weil 	struct ceph_cap *cap;
142a8599bd8SSage Weil 
143a8599bd8SSage Weil 	spin_lock(&caps_list_lock);
144a8599bd8SSage Weil 	while (!list_empty(&caps_list)) {
145a8599bd8SSage Weil 		cap = list_first_entry(&caps_list, struct ceph_cap, caps_item);
146a8599bd8SSage Weil 		list_del(&cap->caps_item);
147a8599bd8SSage Weil 		kmem_cache_free(ceph_cap_cachep, cap);
148a8599bd8SSage Weil 	}
149a8599bd8SSage Weil 	caps_total_count = 0;
150a8599bd8SSage Weil 	caps_avail_count = 0;
151a8599bd8SSage Weil 	caps_use_count = 0;
152a8599bd8SSage Weil 	caps_reserve_count = 0;
15385ccce43SSage Weil 	caps_min_count = 0;
15485ccce43SSage Weil 	spin_unlock(&caps_list_lock);
15585ccce43SSage Weil }
15685ccce43SSage Weil 
15785ccce43SSage Weil void ceph_adjust_min_caps(int delta)
15885ccce43SSage Weil {
15985ccce43SSage Weil 	spin_lock(&caps_list_lock);
16085ccce43SSage Weil 	caps_min_count += delta;
16185ccce43SSage Weil 	BUG_ON(caps_min_count < 0);
162a8599bd8SSage Weil 	spin_unlock(&caps_list_lock);
163a8599bd8SSage Weil }
164a8599bd8SSage Weil 
165a8599bd8SSage Weil int ceph_reserve_caps(struct ceph_cap_reservation *ctx, int need)
166a8599bd8SSage Weil {
167a8599bd8SSage Weil 	int i;
168a8599bd8SSage Weil 	struct ceph_cap *cap;
169a8599bd8SSage Weil 	int have;
170a8599bd8SSage Weil 	int alloc = 0;
171a8599bd8SSage Weil 	LIST_HEAD(newcaps);
172a8599bd8SSage Weil 	int ret = 0;
173a8599bd8SSage Weil 
174a8599bd8SSage Weil 	dout("reserve caps ctx=%p need=%d\n", ctx, need);
175a8599bd8SSage Weil 
176a8599bd8SSage Weil 	/* first reserve any caps that are already allocated */
177a8599bd8SSage Weil 	spin_lock(&caps_list_lock);
178a8599bd8SSage Weil 	if (caps_avail_count >= need)
179a8599bd8SSage Weil 		have = need;
180a8599bd8SSage Weil 	else
181a8599bd8SSage Weil 		have = caps_avail_count;
182a8599bd8SSage Weil 	caps_avail_count -= have;
183a8599bd8SSage Weil 	caps_reserve_count += have;
184a8599bd8SSage Weil 	BUG_ON(caps_total_count != caps_use_count + caps_reserve_count +
185a8599bd8SSage Weil 	       caps_avail_count);
186a8599bd8SSage Weil 	spin_unlock(&caps_list_lock);
187a8599bd8SSage Weil 
188a8599bd8SSage Weil 	for (i = have; i < need; i++) {
189a8599bd8SSage Weil 		cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
190a8599bd8SSage Weil 		if (!cap) {
191a8599bd8SSage Weil 			ret = -ENOMEM;
192a8599bd8SSage Weil 			goto out_alloc_count;
193a8599bd8SSage Weil 		}
194a8599bd8SSage Weil 		list_add(&cap->caps_item, &newcaps);
195a8599bd8SSage Weil 		alloc++;
196a8599bd8SSage Weil 	}
197a8599bd8SSage Weil 	BUG_ON(have + alloc != need);
198a8599bd8SSage Weil 
199a8599bd8SSage Weil 	spin_lock(&caps_list_lock);
200a8599bd8SSage Weil 	caps_total_count += alloc;
201a8599bd8SSage Weil 	caps_reserve_count += alloc;
202a8599bd8SSage Weil 	list_splice(&newcaps, &caps_list);
203a8599bd8SSage Weil 
204a8599bd8SSage Weil 	BUG_ON(caps_total_count != caps_use_count + caps_reserve_count +
205a8599bd8SSage Weil 	       caps_avail_count);
206a8599bd8SSage Weil 	spin_unlock(&caps_list_lock);
207a8599bd8SSage Weil 
208a8599bd8SSage Weil 	ctx->count = need;
209a8599bd8SSage Weil 	dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
210a8599bd8SSage Weil 	     ctx, caps_total_count, caps_use_count, caps_reserve_count,
211a8599bd8SSage Weil 	     caps_avail_count);
212a8599bd8SSage Weil 	return 0;
213a8599bd8SSage Weil 
214a8599bd8SSage Weil out_alloc_count:
215a8599bd8SSage Weil 	/* we didn't manage to reserve as much as we needed */
216a8599bd8SSage Weil 	pr_warning("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
217a8599bd8SSage Weil 		   ctx, need, have);
218a8599bd8SSage Weil 	return ret;
219a8599bd8SSage Weil }
220a8599bd8SSage Weil 
221a8599bd8SSage Weil int ceph_unreserve_caps(struct ceph_cap_reservation *ctx)
222a8599bd8SSage Weil {
223a8599bd8SSage Weil 	dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
224a8599bd8SSage Weil 	if (ctx->count) {
225a8599bd8SSage Weil 		spin_lock(&caps_list_lock);
226a8599bd8SSage Weil 		BUG_ON(caps_reserve_count < ctx->count);
227a8599bd8SSage Weil 		caps_reserve_count -= ctx->count;
228a8599bd8SSage Weil 		caps_avail_count += ctx->count;
229a8599bd8SSage Weil 		ctx->count = 0;
230a8599bd8SSage Weil 		dout("unreserve caps %d = %d used + %d resv + %d avail\n",
231a8599bd8SSage Weil 		     caps_total_count, caps_use_count, caps_reserve_count,
232a8599bd8SSage Weil 		     caps_avail_count);
233a8599bd8SSage Weil 		BUG_ON(caps_total_count != caps_use_count + caps_reserve_count +
234a8599bd8SSage Weil 		       caps_avail_count);
235a8599bd8SSage Weil 		spin_unlock(&caps_list_lock);
236a8599bd8SSage Weil 	}
237a8599bd8SSage Weil 	return 0;
238a8599bd8SSage Weil }
239a8599bd8SSage Weil 
240a8599bd8SSage Weil static struct ceph_cap *get_cap(struct ceph_cap_reservation *ctx)
241a8599bd8SSage Weil {
242a8599bd8SSage Weil 	struct ceph_cap *cap = NULL;
243a8599bd8SSage Weil 
244a8599bd8SSage Weil 	/* temporary, until we do something about cap import/export */
245a8599bd8SSage Weil 	if (!ctx)
246a8599bd8SSage Weil 		return kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
247a8599bd8SSage Weil 
248a8599bd8SSage Weil 	spin_lock(&caps_list_lock);
249a8599bd8SSage Weil 	dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
250a8599bd8SSage Weil 	     ctx, ctx->count, caps_total_count, caps_use_count,
251a8599bd8SSage Weil 	     caps_reserve_count, caps_avail_count);
252a8599bd8SSage Weil 	BUG_ON(!ctx->count);
253a8599bd8SSage Weil 	BUG_ON(ctx->count > caps_reserve_count);
254a8599bd8SSage Weil 	BUG_ON(list_empty(&caps_list));
255a8599bd8SSage Weil 
256a8599bd8SSage Weil 	ctx->count--;
257a8599bd8SSage Weil 	caps_reserve_count--;
258a8599bd8SSage Weil 	caps_use_count++;
259a8599bd8SSage Weil 
260a8599bd8SSage Weil 	cap = list_first_entry(&caps_list, struct ceph_cap, caps_item);
261a8599bd8SSage Weil 	list_del(&cap->caps_item);
262a8599bd8SSage Weil 
263a8599bd8SSage Weil 	BUG_ON(caps_total_count != caps_use_count + caps_reserve_count +
264a8599bd8SSage Weil 	       caps_avail_count);
265a8599bd8SSage Weil 	spin_unlock(&caps_list_lock);
266a8599bd8SSage Weil 	return cap;
267a8599bd8SSage Weil }
268a8599bd8SSage Weil 
2697c1332b8SSage Weil void ceph_put_cap(struct ceph_cap *cap)
270a8599bd8SSage Weil {
271a8599bd8SSage Weil 	spin_lock(&caps_list_lock);
2727c1332b8SSage Weil 	dout("put_cap %p %d = %d used + %d resv + %d avail\n",
2737c1332b8SSage Weil 	     cap, caps_total_count, caps_use_count,
274a8599bd8SSage Weil 	     caps_reserve_count, caps_avail_count);
275a8599bd8SSage Weil 	caps_use_count--;
276a8599bd8SSage Weil 	/*
27785ccce43SSage Weil 	 * Keep some preallocated caps around (ceph_min_count), to
27885ccce43SSage Weil 	 * avoid lots of free/alloc churn.
279a8599bd8SSage Weil 	 */
28085ccce43SSage Weil 	if (caps_avail_count >= caps_reserve_count + caps_min_count) {
281a8599bd8SSage Weil 		caps_total_count--;
282a8599bd8SSage Weil 		kmem_cache_free(ceph_cap_cachep, cap);
283a8599bd8SSage Weil 	} else {
284a8599bd8SSage Weil 		caps_avail_count++;
285a8599bd8SSage Weil 		list_add(&cap->caps_item, &caps_list);
286a8599bd8SSage Weil 	}
287a8599bd8SSage Weil 
288a8599bd8SSage Weil 	BUG_ON(caps_total_count != caps_use_count + caps_reserve_count +
289a8599bd8SSage Weil 	       caps_avail_count);
290a8599bd8SSage Weil 	spin_unlock(&caps_list_lock);
291a8599bd8SSage Weil }
292a8599bd8SSage Weil 
293a8599bd8SSage Weil void ceph_reservation_status(struct ceph_client *client,
29485ccce43SSage Weil 			     int *total, int *avail, int *used, int *reserved,
29585ccce43SSage Weil 			     int *min)
296a8599bd8SSage Weil {
297a8599bd8SSage Weil 	if (total)
298a8599bd8SSage Weil 		*total = caps_total_count;
299a8599bd8SSage Weil 	if (avail)
300a8599bd8SSage Weil 		*avail = caps_avail_count;
301a8599bd8SSage Weil 	if (used)
302a8599bd8SSage Weil 		*used = caps_use_count;
303a8599bd8SSage Weil 	if (reserved)
304a8599bd8SSage Weil 		*reserved = caps_reserve_count;
30585ccce43SSage Weil 	if (min)
30685ccce43SSage Weil 		*min = caps_min_count;
307a8599bd8SSage Weil }
308a8599bd8SSage Weil 
309a8599bd8SSage Weil /*
310a8599bd8SSage Weil  * Find ceph_cap for given mds, if any.
311a8599bd8SSage Weil  *
312a8599bd8SSage Weil  * Called with i_lock held.
313a8599bd8SSage Weil  */
314a8599bd8SSage Weil static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
315a8599bd8SSage Weil {
316a8599bd8SSage Weil 	struct ceph_cap *cap;
317a8599bd8SSage Weil 	struct rb_node *n = ci->i_caps.rb_node;
318a8599bd8SSage Weil 
319a8599bd8SSage Weil 	while (n) {
320a8599bd8SSage Weil 		cap = rb_entry(n, struct ceph_cap, ci_node);
321a8599bd8SSage Weil 		if (mds < cap->mds)
322a8599bd8SSage Weil 			n = n->rb_left;
323a8599bd8SSage Weil 		else if (mds > cap->mds)
324a8599bd8SSage Weil 			n = n->rb_right;
325a8599bd8SSage Weil 		else
326a8599bd8SSage Weil 			return cap;
327a8599bd8SSage Weil 	}
328a8599bd8SSage Weil 	return NULL;
329a8599bd8SSage Weil }
330a8599bd8SSage Weil 
331a8599bd8SSage Weil /*
332a8599bd8SSage Weil  * Return id of any MDS with a cap, preferably FILE_WR|WRBUFFER|EXCL, else
333a8599bd8SSage Weil  * -1.
334a8599bd8SSage Weil  */
335a8599bd8SSage Weil static int __ceph_get_cap_mds(struct ceph_inode_info *ci, u32 *mseq)
336a8599bd8SSage Weil {
337a8599bd8SSage Weil 	struct ceph_cap *cap;
338a8599bd8SSage Weil 	int mds = -1;
339a8599bd8SSage Weil 	struct rb_node *p;
340a8599bd8SSage Weil 
341a8599bd8SSage Weil 	/* prefer mds with WR|WRBUFFER|EXCL caps */
342a8599bd8SSage Weil 	for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
343a8599bd8SSage Weil 		cap = rb_entry(p, struct ceph_cap, ci_node);
344a8599bd8SSage Weil 		mds = cap->mds;
345a8599bd8SSage Weil 		if (mseq)
346a8599bd8SSage Weil 			*mseq = cap->mseq;
347a8599bd8SSage Weil 		if (cap->issued & (CEPH_CAP_FILE_WR |
348a8599bd8SSage Weil 				   CEPH_CAP_FILE_BUFFER |
349a8599bd8SSage Weil 				   CEPH_CAP_FILE_EXCL))
350a8599bd8SSage Weil 			break;
351a8599bd8SSage Weil 	}
352a8599bd8SSage Weil 	return mds;
353a8599bd8SSage Weil }
354a8599bd8SSage Weil 
355a8599bd8SSage Weil int ceph_get_cap_mds(struct inode *inode)
356a8599bd8SSage Weil {
357a8599bd8SSage Weil 	int mds;
358a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
359a8599bd8SSage Weil 	mds = __ceph_get_cap_mds(ceph_inode(inode), NULL);
360a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
361a8599bd8SSage Weil 	return mds;
362a8599bd8SSage Weil }
363a8599bd8SSage Weil 
364a8599bd8SSage Weil /*
365a8599bd8SSage Weil  * Called under i_lock.
366a8599bd8SSage Weil  */
367a8599bd8SSage Weil static void __insert_cap_node(struct ceph_inode_info *ci,
368a8599bd8SSage Weil 			      struct ceph_cap *new)
369a8599bd8SSage Weil {
370a8599bd8SSage Weil 	struct rb_node **p = &ci->i_caps.rb_node;
371a8599bd8SSage Weil 	struct rb_node *parent = NULL;
372a8599bd8SSage Weil 	struct ceph_cap *cap = NULL;
373a8599bd8SSage Weil 
374a8599bd8SSage Weil 	while (*p) {
375a8599bd8SSage Weil 		parent = *p;
376a8599bd8SSage Weil 		cap = rb_entry(parent, struct ceph_cap, ci_node);
377a8599bd8SSage Weil 		if (new->mds < cap->mds)
378a8599bd8SSage Weil 			p = &(*p)->rb_left;
379a8599bd8SSage Weil 		else if (new->mds > cap->mds)
380a8599bd8SSage Weil 			p = &(*p)->rb_right;
381a8599bd8SSage Weil 		else
382a8599bd8SSage Weil 			BUG();
383a8599bd8SSage Weil 	}
384a8599bd8SSage Weil 
385a8599bd8SSage Weil 	rb_link_node(&new->ci_node, parent, p);
386a8599bd8SSage Weil 	rb_insert_color(&new->ci_node, &ci->i_caps);
387a8599bd8SSage Weil }
388a8599bd8SSage Weil 
389a8599bd8SSage Weil /*
390a8599bd8SSage Weil  * (re)set cap hold timeouts, which control the delayed release
391a8599bd8SSage Weil  * of unused caps back to the MDS.  Should be called on cap use.
392a8599bd8SSage Weil  */
393a8599bd8SSage Weil static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
394a8599bd8SSage Weil 			       struct ceph_inode_info *ci)
395a8599bd8SSage Weil {
3966b805185SSage Weil 	struct ceph_mount_args *ma = mdsc->client->mount_args;
397a8599bd8SSage Weil 
398a8599bd8SSage Weil 	ci->i_hold_caps_min = round_jiffies(jiffies +
399a8599bd8SSage Weil 					    ma->caps_wanted_delay_min * HZ);
400a8599bd8SSage Weil 	ci->i_hold_caps_max = round_jiffies(jiffies +
401a8599bd8SSage Weil 					    ma->caps_wanted_delay_max * HZ);
402a8599bd8SSage Weil 	dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
403a8599bd8SSage Weil 	     ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
404a8599bd8SSage Weil }
405a8599bd8SSage Weil 
406a8599bd8SSage Weil /*
407a8599bd8SSage Weil  * (Re)queue cap at the end of the delayed cap release list.
408a8599bd8SSage Weil  *
409a8599bd8SSage Weil  * If I_FLUSH is set, leave the inode at the front of the list.
410a8599bd8SSage Weil  *
411a8599bd8SSage Weil  * Caller holds i_lock
412a8599bd8SSage Weil  *    -> we take mdsc->cap_delay_lock
413a8599bd8SSage Weil  */
414a8599bd8SSage Weil static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
415a8599bd8SSage Weil 				struct ceph_inode_info *ci)
416a8599bd8SSage Weil {
417a8599bd8SSage Weil 	__cap_set_timeouts(mdsc, ci);
418a8599bd8SSage Weil 	dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
419a8599bd8SSage Weil 	     ci->i_ceph_flags, ci->i_hold_caps_max);
420a8599bd8SSage Weil 	if (!mdsc->stopping) {
421a8599bd8SSage Weil 		spin_lock(&mdsc->cap_delay_lock);
422a8599bd8SSage Weil 		if (!list_empty(&ci->i_cap_delay_list)) {
423a8599bd8SSage Weil 			if (ci->i_ceph_flags & CEPH_I_FLUSH)
424a8599bd8SSage Weil 				goto no_change;
425a8599bd8SSage Weil 			list_del_init(&ci->i_cap_delay_list);
426a8599bd8SSage Weil 		}
427a8599bd8SSage Weil 		list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
428a8599bd8SSage Weil no_change:
429a8599bd8SSage Weil 		spin_unlock(&mdsc->cap_delay_lock);
430a8599bd8SSage Weil 	}
431a8599bd8SSage Weil }
432a8599bd8SSage Weil 
433a8599bd8SSage Weil /*
434a8599bd8SSage Weil  * Queue an inode for immediate writeback.  Mark inode with I_FLUSH,
435a8599bd8SSage Weil  * indicating we should send a cap message to flush dirty metadata
436a8599bd8SSage Weil  * asap, and move to the front of the delayed cap list.
437a8599bd8SSage Weil  */
438a8599bd8SSage Weil static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
439a8599bd8SSage Weil 				      struct ceph_inode_info *ci)
440a8599bd8SSage Weil {
441a8599bd8SSage Weil 	dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
442a8599bd8SSage Weil 	spin_lock(&mdsc->cap_delay_lock);
443a8599bd8SSage Weil 	ci->i_ceph_flags |= CEPH_I_FLUSH;
444a8599bd8SSage Weil 	if (!list_empty(&ci->i_cap_delay_list))
445a8599bd8SSage Weil 		list_del_init(&ci->i_cap_delay_list);
446a8599bd8SSage Weil 	list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
447a8599bd8SSage Weil 	spin_unlock(&mdsc->cap_delay_lock);
448a8599bd8SSage Weil }
449a8599bd8SSage Weil 
450a8599bd8SSage Weil /*
451a8599bd8SSage Weil  * Cancel delayed work on cap.
452a8599bd8SSage Weil  *
453a8599bd8SSage Weil  * Caller must hold i_lock.
454a8599bd8SSage Weil  */
455a8599bd8SSage Weil static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
456a8599bd8SSage Weil 			       struct ceph_inode_info *ci)
457a8599bd8SSage Weil {
458a8599bd8SSage Weil 	dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
459a8599bd8SSage Weil 	if (list_empty(&ci->i_cap_delay_list))
460a8599bd8SSage Weil 		return;
461a8599bd8SSage Weil 	spin_lock(&mdsc->cap_delay_lock);
462a8599bd8SSage Weil 	list_del_init(&ci->i_cap_delay_list);
463a8599bd8SSage Weil 	spin_unlock(&mdsc->cap_delay_lock);
464a8599bd8SSage Weil }
465a8599bd8SSage Weil 
466a8599bd8SSage Weil /*
467a8599bd8SSage Weil  * Common issue checks for add_cap, handle_cap_grant.
468a8599bd8SSage Weil  */
469a8599bd8SSage Weil static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
470a8599bd8SSage Weil 			      unsigned issued)
471a8599bd8SSage Weil {
472a8599bd8SSage Weil 	unsigned had = __ceph_caps_issued(ci, NULL);
473a8599bd8SSage Weil 
474a8599bd8SSage Weil 	/*
475a8599bd8SSage Weil 	 * Each time we receive FILE_CACHE anew, we increment
476a8599bd8SSage Weil 	 * i_rdcache_gen.
477a8599bd8SSage Weil 	 */
478a8599bd8SSage Weil 	if ((issued & CEPH_CAP_FILE_CACHE) &&
479a8599bd8SSage Weil 	    (had & CEPH_CAP_FILE_CACHE) == 0)
480a8599bd8SSage Weil 		ci->i_rdcache_gen++;
481a8599bd8SSage Weil 
482a8599bd8SSage Weil 	/*
483a8599bd8SSage Weil 	 * if we are newly issued FILE_SHARED, clear I_COMPLETE; we
484a8599bd8SSage Weil 	 * don't know what happened to this directory while we didn't
485a8599bd8SSage Weil 	 * have the cap.
486a8599bd8SSage Weil 	 */
487a8599bd8SSage Weil 	if ((issued & CEPH_CAP_FILE_SHARED) &&
488a8599bd8SSage Weil 	    (had & CEPH_CAP_FILE_SHARED) == 0) {
489a8599bd8SSage Weil 		ci->i_shared_gen++;
490a8599bd8SSage Weil 		if (S_ISDIR(ci->vfs_inode.i_mode)) {
491a8599bd8SSage Weil 			dout(" marking %p NOT complete\n", &ci->vfs_inode);
492a8599bd8SSage Weil 			ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
493a8599bd8SSage Weil 		}
494a8599bd8SSage Weil 	}
495a8599bd8SSage Weil }
496a8599bd8SSage Weil 
497a8599bd8SSage Weil /*
498a8599bd8SSage Weil  * Add a capability under the given MDS session.
499a8599bd8SSage Weil  *
500a8599bd8SSage Weil  * Caller should hold session snap_rwsem (read) and s_mutex.
501a8599bd8SSage Weil  *
502a8599bd8SSage Weil  * @fmode is the open file mode, if we are opening a file, otherwise
503a8599bd8SSage Weil  * it is < 0.  (This is so we can atomically add the cap and add an
504a8599bd8SSage Weil  * open file reference to it.)
505a8599bd8SSage Weil  */
506a8599bd8SSage Weil int ceph_add_cap(struct inode *inode,
507a8599bd8SSage Weil 		 struct ceph_mds_session *session, u64 cap_id,
508a8599bd8SSage Weil 		 int fmode, unsigned issued, unsigned wanted,
509a8599bd8SSage Weil 		 unsigned seq, unsigned mseq, u64 realmino, int flags,
510a8599bd8SSage Weil 		 struct ceph_cap_reservation *caps_reservation)
511a8599bd8SSage Weil {
512a8599bd8SSage Weil 	struct ceph_mds_client *mdsc = &ceph_inode_to_client(inode)->mdsc;
513a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
514a8599bd8SSage Weil 	struct ceph_cap *new_cap = NULL;
515a8599bd8SSage Weil 	struct ceph_cap *cap;
516a8599bd8SSage Weil 	int mds = session->s_mds;
517a8599bd8SSage Weil 	int actual_wanted;
518a8599bd8SSage Weil 
519a8599bd8SSage Weil 	dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
520a8599bd8SSage Weil 	     session->s_mds, cap_id, ceph_cap_string(issued), seq);
521a8599bd8SSage Weil 
522a8599bd8SSage Weil 	/*
523a8599bd8SSage Weil 	 * If we are opening the file, include file mode wanted bits
524a8599bd8SSage Weil 	 * in wanted.
525a8599bd8SSage Weil 	 */
526a8599bd8SSage Weil 	if (fmode >= 0)
527a8599bd8SSage Weil 		wanted |= ceph_caps_for_mode(fmode);
528a8599bd8SSage Weil 
529a8599bd8SSage Weil retry:
530a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
531a8599bd8SSage Weil 	cap = __get_cap_for_mds(ci, mds);
532a8599bd8SSage Weil 	if (!cap) {
533a8599bd8SSage Weil 		if (new_cap) {
534a8599bd8SSage Weil 			cap = new_cap;
535a8599bd8SSage Weil 			new_cap = NULL;
536a8599bd8SSage Weil 		} else {
537a8599bd8SSage Weil 			spin_unlock(&inode->i_lock);
538a8599bd8SSage Weil 			new_cap = get_cap(caps_reservation);
539a8599bd8SSage Weil 			if (new_cap == NULL)
540a8599bd8SSage Weil 				return -ENOMEM;
541a8599bd8SSage Weil 			goto retry;
542a8599bd8SSage Weil 		}
543a8599bd8SSage Weil 
544a8599bd8SSage Weil 		cap->issued = 0;
545a8599bd8SSage Weil 		cap->implemented = 0;
546a8599bd8SSage Weil 		cap->mds = mds;
547a8599bd8SSage Weil 		cap->mds_wanted = 0;
548a8599bd8SSage Weil 
549a8599bd8SSage Weil 		cap->ci = ci;
550a8599bd8SSage Weil 		__insert_cap_node(ci, cap);
551a8599bd8SSage Weil 
552a8599bd8SSage Weil 		/* clear out old exporting info?  (i.e. on cap import) */
553a8599bd8SSage Weil 		if (ci->i_cap_exporting_mds == mds) {
554a8599bd8SSage Weil 			ci->i_cap_exporting_issued = 0;
555a8599bd8SSage Weil 			ci->i_cap_exporting_mseq = 0;
556a8599bd8SSage Weil 			ci->i_cap_exporting_mds = -1;
557a8599bd8SSage Weil 		}
558a8599bd8SSage Weil 
559a8599bd8SSage Weil 		/* add to session cap list */
560a8599bd8SSage Weil 		cap->session = session;
561a8599bd8SSage Weil 		spin_lock(&session->s_cap_lock);
562a8599bd8SSage Weil 		list_add_tail(&cap->session_caps, &session->s_caps);
563a8599bd8SSage Weil 		session->s_nr_caps++;
564a8599bd8SSage Weil 		spin_unlock(&session->s_cap_lock);
565a8599bd8SSage Weil 	}
566a8599bd8SSage Weil 
567a8599bd8SSage Weil 	if (!ci->i_snap_realm) {
568a8599bd8SSage Weil 		/*
569a8599bd8SSage Weil 		 * add this inode to the appropriate snap realm
570a8599bd8SSage Weil 		 */
571a8599bd8SSage Weil 		struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
572a8599bd8SSage Weil 							       realmino);
573a8599bd8SSage Weil 		if (realm) {
574a8599bd8SSage Weil 			ceph_get_snap_realm(mdsc, realm);
575a8599bd8SSage Weil 			spin_lock(&realm->inodes_with_caps_lock);
576a8599bd8SSage Weil 			ci->i_snap_realm = realm;
577a8599bd8SSage Weil 			list_add(&ci->i_snap_realm_item,
578a8599bd8SSage Weil 				 &realm->inodes_with_caps);
579a8599bd8SSage Weil 			spin_unlock(&realm->inodes_with_caps_lock);
580a8599bd8SSage Weil 		} else {
581a8599bd8SSage Weil 			pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
582a8599bd8SSage Weil 			       realmino);
583a8599bd8SSage Weil 		}
584a8599bd8SSage Weil 	}
585a8599bd8SSage Weil 
586a8599bd8SSage Weil 	__check_cap_issue(ci, cap, issued);
587a8599bd8SSage Weil 
588a8599bd8SSage Weil 	/*
589a8599bd8SSage Weil 	 * If we are issued caps we don't want, or the mds' wanted
590a8599bd8SSage Weil 	 * value appears to be off, queue a check so we'll release
591a8599bd8SSage Weil 	 * later and/or update the mds wanted value.
592a8599bd8SSage Weil 	 */
593a8599bd8SSage Weil 	actual_wanted = __ceph_caps_wanted(ci);
594a8599bd8SSage Weil 	if ((wanted & ~actual_wanted) ||
595a8599bd8SSage Weil 	    (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
596a8599bd8SSage Weil 		dout(" issued %s, mds wanted %s, actual %s, queueing\n",
597a8599bd8SSage Weil 		     ceph_cap_string(issued), ceph_cap_string(wanted),
598a8599bd8SSage Weil 		     ceph_cap_string(actual_wanted));
599a8599bd8SSage Weil 		__cap_delay_requeue(mdsc, ci);
600a8599bd8SSage Weil 	}
601a8599bd8SSage Weil 
602a8599bd8SSage Weil 	if (flags & CEPH_CAP_FLAG_AUTH)
603a8599bd8SSage Weil 		ci->i_auth_cap = cap;
604a8599bd8SSage Weil 	else if (ci->i_auth_cap == cap)
605a8599bd8SSage Weil 		ci->i_auth_cap = NULL;
606a8599bd8SSage Weil 
607a8599bd8SSage Weil 	dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
608a8599bd8SSage Weil 	     inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
609a8599bd8SSage Weil 	     ceph_cap_string(issued|cap->issued), seq, mds);
610a8599bd8SSage Weil 	cap->cap_id = cap_id;
611a8599bd8SSage Weil 	cap->issued = issued;
612a8599bd8SSage Weil 	cap->implemented |= issued;
613a8599bd8SSage Weil 	cap->mds_wanted |= wanted;
614a8599bd8SSage Weil 	cap->seq = seq;
615a8599bd8SSage Weil 	cap->issue_seq = seq;
616a8599bd8SSage Weil 	cap->mseq = mseq;
617685f9a5dSSage Weil 	cap->cap_gen = session->s_cap_gen;
618a8599bd8SSage Weil 
619a8599bd8SSage Weil 	if (fmode >= 0)
620a8599bd8SSage Weil 		__ceph_get_fmode(ci, fmode);
621a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
622a8599bd8SSage Weil 	wake_up(&ci->i_cap_wq);
623a8599bd8SSage Weil 	return 0;
624a8599bd8SSage Weil }
625a8599bd8SSage Weil 
626a8599bd8SSage Weil /*
627a8599bd8SSage Weil  * Return true if cap has not timed out and belongs to the current
628a8599bd8SSage Weil  * generation of the MDS session (i.e. has not gone 'stale' due to
629a8599bd8SSage Weil  * us losing touch with the mds).
630a8599bd8SSage Weil  */
631a8599bd8SSage Weil static int __cap_is_valid(struct ceph_cap *cap)
632a8599bd8SSage Weil {
633a8599bd8SSage Weil 	unsigned long ttl;
634cdac8303SSage Weil 	u32 gen;
635a8599bd8SSage Weil 
636a8599bd8SSage Weil 	spin_lock(&cap->session->s_cap_lock);
637a8599bd8SSage Weil 	gen = cap->session->s_cap_gen;
638a8599bd8SSage Weil 	ttl = cap->session->s_cap_ttl;
639a8599bd8SSage Weil 	spin_unlock(&cap->session->s_cap_lock);
640a8599bd8SSage Weil 
641685f9a5dSSage Weil 	if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
642a8599bd8SSage Weil 		dout("__cap_is_valid %p cap %p issued %s "
643a8599bd8SSage Weil 		     "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
644685f9a5dSSage Weil 		     cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
645a8599bd8SSage Weil 		return 0;
646a8599bd8SSage Weil 	}
647a8599bd8SSage Weil 
648a8599bd8SSage Weil 	return 1;
649a8599bd8SSage Weil }
650a8599bd8SSage Weil 
651a8599bd8SSage Weil /*
652a8599bd8SSage Weil  * Return set of valid cap bits issued to us.  Note that caps time
653a8599bd8SSage Weil  * out, and may be invalidated in bulk if the client session times out
654a8599bd8SSage Weil  * and session->s_cap_gen is bumped.
655a8599bd8SSage Weil  */
656a8599bd8SSage Weil int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
657a8599bd8SSage Weil {
658a8599bd8SSage Weil 	int have = ci->i_snap_caps;
659a8599bd8SSage Weil 	struct ceph_cap *cap;
660a8599bd8SSage Weil 	struct rb_node *p;
661a8599bd8SSage Weil 
662a8599bd8SSage Weil 	if (implemented)
663a8599bd8SSage Weil 		*implemented = 0;
664a8599bd8SSage Weil 	for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
665a8599bd8SSage Weil 		cap = rb_entry(p, struct ceph_cap, ci_node);
666a8599bd8SSage Weil 		if (!__cap_is_valid(cap))
667a8599bd8SSage Weil 			continue;
668a8599bd8SSage Weil 		dout("__ceph_caps_issued %p cap %p issued %s\n",
669a8599bd8SSage Weil 		     &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
670a8599bd8SSage Weil 		have |= cap->issued;
671a8599bd8SSage Weil 		if (implemented)
672a8599bd8SSage Weil 			*implemented |= cap->implemented;
673a8599bd8SSage Weil 	}
674a8599bd8SSage Weil 	return have;
675a8599bd8SSage Weil }
676a8599bd8SSage Weil 
677a8599bd8SSage Weil /*
678a8599bd8SSage Weil  * Get cap bits issued by caps other than @ocap
679a8599bd8SSage Weil  */
680a8599bd8SSage Weil int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
681a8599bd8SSage Weil {
682a8599bd8SSage Weil 	int have = ci->i_snap_caps;
683a8599bd8SSage Weil 	struct ceph_cap *cap;
684a8599bd8SSage Weil 	struct rb_node *p;
685a8599bd8SSage Weil 
686a8599bd8SSage Weil 	for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
687a8599bd8SSage Weil 		cap = rb_entry(p, struct ceph_cap, ci_node);
688a8599bd8SSage Weil 		if (cap == ocap)
689a8599bd8SSage Weil 			continue;
690a8599bd8SSage Weil 		if (!__cap_is_valid(cap))
691a8599bd8SSage Weil 			continue;
692a8599bd8SSage Weil 		have |= cap->issued;
693a8599bd8SSage Weil 	}
694a8599bd8SSage Weil 	return have;
695a8599bd8SSage Weil }
696a8599bd8SSage Weil 
697a8599bd8SSage Weil /*
698a8599bd8SSage Weil  * Move a cap to the end of the LRU (oldest caps at list head, newest
699a8599bd8SSage Weil  * at list tail).
700a8599bd8SSage Weil  */
701a8599bd8SSage Weil static void __touch_cap(struct ceph_cap *cap)
702a8599bd8SSage Weil {
703a8599bd8SSage Weil 	struct ceph_mds_session *s = cap->session;
704a8599bd8SSage Weil 
7055dacf091SSage Weil 	spin_lock(&s->s_cap_lock);
7067c1332b8SSage Weil 	if (s->s_cap_iterator == NULL) {
707a8599bd8SSage Weil 		dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
708a8599bd8SSage Weil 		     s->s_mds);
709a8599bd8SSage Weil 		list_move_tail(&cap->session_caps, &s->s_caps);
7105dacf091SSage Weil 	} else {
7115dacf091SSage Weil 		dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
7125dacf091SSage Weil 		     &cap->ci->vfs_inode, cap, s->s_mds);
7135dacf091SSage Weil 	}
714a8599bd8SSage Weil 	spin_unlock(&s->s_cap_lock);
715a8599bd8SSage Weil }
716a8599bd8SSage Weil 
717a8599bd8SSage Weil /*
718a8599bd8SSage Weil  * Check if we hold the given mask.  If so, move the cap(s) to the
719a8599bd8SSage Weil  * front of their respective LRUs.  (This is the preferred way for
720a8599bd8SSage Weil  * callers to check for caps they want.)
721a8599bd8SSage Weil  */
722a8599bd8SSage Weil int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
723a8599bd8SSage Weil {
724a8599bd8SSage Weil 	struct ceph_cap *cap;
725a8599bd8SSage Weil 	struct rb_node *p;
726a8599bd8SSage Weil 	int have = ci->i_snap_caps;
727a8599bd8SSage Weil 
728a8599bd8SSage Weil 	if ((have & mask) == mask) {
729a8599bd8SSage Weil 		dout("__ceph_caps_issued_mask %p snap issued %s"
730a8599bd8SSage Weil 		     " (mask %s)\n", &ci->vfs_inode,
731a8599bd8SSage Weil 		     ceph_cap_string(have),
732a8599bd8SSage Weil 		     ceph_cap_string(mask));
733a8599bd8SSage Weil 		return 1;
734a8599bd8SSage Weil 	}
735a8599bd8SSage Weil 
736a8599bd8SSage Weil 	for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
737a8599bd8SSage Weil 		cap = rb_entry(p, struct ceph_cap, ci_node);
738a8599bd8SSage Weil 		if (!__cap_is_valid(cap))
739a8599bd8SSage Weil 			continue;
740a8599bd8SSage Weil 		if ((cap->issued & mask) == mask) {
741a8599bd8SSage Weil 			dout("__ceph_caps_issued_mask %p cap %p issued %s"
742a8599bd8SSage Weil 			     " (mask %s)\n", &ci->vfs_inode, cap,
743a8599bd8SSage Weil 			     ceph_cap_string(cap->issued),
744a8599bd8SSage Weil 			     ceph_cap_string(mask));
745a8599bd8SSage Weil 			if (touch)
746a8599bd8SSage Weil 				__touch_cap(cap);
747a8599bd8SSage Weil 			return 1;
748a8599bd8SSage Weil 		}
749a8599bd8SSage Weil 
750a8599bd8SSage Weil 		/* does a combination of caps satisfy mask? */
751a8599bd8SSage Weil 		have |= cap->issued;
752a8599bd8SSage Weil 		if ((have & mask) == mask) {
753a8599bd8SSage Weil 			dout("__ceph_caps_issued_mask %p combo issued %s"
754a8599bd8SSage Weil 			     " (mask %s)\n", &ci->vfs_inode,
755a8599bd8SSage Weil 			     ceph_cap_string(cap->issued),
756a8599bd8SSage Weil 			     ceph_cap_string(mask));
757a8599bd8SSage Weil 			if (touch) {
758a8599bd8SSage Weil 				struct rb_node *q;
759a8599bd8SSage Weil 
760a8599bd8SSage Weil 				/* touch this + preceeding caps */
761a8599bd8SSage Weil 				__touch_cap(cap);
762a8599bd8SSage Weil 				for (q = rb_first(&ci->i_caps); q != p;
763a8599bd8SSage Weil 				     q = rb_next(q)) {
764a8599bd8SSage Weil 					cap = rb_entry(q, struct ceph_cap,
765a8599bd8SSage Weil 						       ci_node);
766a8599bd8SSage Weil 					if (!__cap_is_valid(cap))
767a8599bd8SSage Weil 						continue;
768a8599bd8SSage Weil 					__touch_cap(cap);
769a8599bd8SSage Weil 				}
770a8599bd8SSage Weil 			}
771a8599bd8SSage Weil 			return 1;
772a8599bd8SSage Weil 		}
773a8599bd8SSage Weil 	}
774a8599bd8SSage Weil 
775a8599bd8SSage Weil 	return 0;
776a8599bd8SSage Weil }
777a8599bd8SSage Weil 
778a8599bd8SSage Weil /*
779a8599bd8SSage Weil  * Return true if mask caps are currently being revoked by an MDS.
780a8599bd8SSage Weil  */
781a8599bd8SSage Weil int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
782a8599bd8SSage Weil {
783a8599bd8SSage Weil 	struct inode *inode = &ci->vfs_inode;
784a8599bd8SSage Weil 	struct ceph_cap *cap;
785a8599bd8SSage Weil 	struct rb_node *p;
786a8599bd8SSage Weil 	int ret = 0;
787a8599bd8SSage Weil 
788a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
789a8599bd8SSage Weil 	for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
790a8599bd8SSage Weil 		cap = rb_entry(p, struct ceph_cap, ci_node);
791a8599bd8SSage Weil 		if (__cap_is_valid(cap) &&
792a8599bd8SSage Weil 		    (cap->implemented & ~cap->issued & mask)) {
793a8599bd8SSage Weil 			ret = 1;
794a8599bd8SSage Weil 			break;
795a8599bd8SSage Weil 		}
796a8599bd8SSage Weil 	}
797a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
798a8599bd8SSage Weil 	dout("ceph_caps_revoking %p %s = %d\n", inode,
799a8599bd8SSage Weil 	     ceph_cap_string(mask), ret);
800a8599bd8SSage Weil 	return ret;
801a8599bd8SSage Weil }
802a8599bd8SSage Weil 
803a8599bd8SSage Weil int __ceph_caps_used(struct ceph_inode_info *ci)
804a8599bd8SSage Weil {
805a8599bd8SSage Weil 	int used = 0;
806a8599bd8SSage Weil 	if (ci->i_pin_ref)
807a8599bd8SSage Weil 		used |= CEPH_CAP_PIN;
808a8599bd8SSage Weil 	if (ci->i_rd_ref)
809a8599bd8SSage Weil 		used |= CEPH_CAP_FILE_RD;
810a8599bd8SSage Weil 	if (ci->i_rdcache_ref || ci->i_rdcache_gen)
811a8599bd8SSage Weil 		used |= CEPH_CAP_FILE_CACHE;
812a8599bd8SSage Weil 	if (ci->i_wr_ref)
813a8599bd8SSage Weil 		used |= CEPH_CAP_FILE_WR;
814a8599bd8SSage Weil 	if (ci->i_wrbuffer_ref)
815a8599bd8SSage Weil 		used |= CEPH_CAP_FILE_BUFFER;
816a8599bd8SSage Weil 	return used;
817a8599bd8SSage Weil }
818a8599bd8SSage Weil 
819a8599bd8SSage Weil /*
820a8599bd8SSage Weil  * wanted, by virtue of open file modes
821a8599bd8SSage Weil  */
822a8599bd8SSage Weil int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
823a8599bd8SSage Weil {
824a8599bd8SSage Weil 	int want = 0;
825a8599bd8SSage Weil 	int mode;
826a8599bd8SSage Weil 	for (mode = 0; mode < 4; mode++)
827a8599bd8SSage Weil 		if (ci->i_nr_by_mode[mode])
828a8599bd8SSage Weil 			want |= ceph_caps_for_mode(mode);
829a8599bd8SSage Weil 	return want;
830a8599bd8SSage Weil }
831a8599bd8SSage Weil 
832a8599bd8SSage Weil /*
833a8599bd8SSage Weil  * Return caps we have registered with the MDS(s) as 'wanted'.
834a8599bd8SSage Weil  */
835a8599bd8SSage Weil int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
836a8599bd8SSage Weil {
837a8599bd8SSage Weil 	struct ceph_cap *cap;
838a8599bd8SSage Weil 	struct rb_node *p;
839a8599bd8SSage Weil 	int mds_wanted = 0;
840a8599bd8SSage Weil 
841a8599bd8SSage Weil 	for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
842a8599bd8SSage Weil 		cap = rb_entry(p, struct ceph_cap, ci_node);
843a8599bd8SSage Weil 		if (!__cap_is_valid(cap))
844a8599bd8SSage Weil 			continue;
845a8599bd8SSage Weil 		mds_wanted |= cap->mds_wanted;
846a8599bd8SSage Weil 	}
847a8599bd8SSage Weil 	return mds_wanted;
848a8599bd8SSage Weil }
849a8599bd8SSage Weil 
850a8599bd8SSage Weil /*
851a8599bd8SSage Weil  * called under i_lock
852a8599bd8SSage Weil  */
853a8599bd8SSage Weil static int __ceph_is_any_caps(struct ceph_inode_info *ci)
854a8599bd8SSage Weil {
855a8599bd8SSage Weil 	return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_mds >= 0;
856a8599bd8SSage Weil }
857a8599bd8SSage Weil 
858a8599bd8SSage Weil /*
859a6369741SSage Weil  * caller should hold i_lock.
860a6369741SSage Weil  * caller will not hold session s_mutex if called from destroy_inode.
861a8599bd8SSage Weil  */
8627c1332b8SSage Weil void __ceph_remove_cap(struct ceph_cap *cap)
863a8599bd8SSage Weil {
864a8599bd8SSage Weil 	struct ceph_mds_session *session = cap->session;
865a8599bd8SSage Weil 	struct ceph_inode_info *ci = cap->ci;
866a8599bd8SSage Weil 	struct ceph_mds_client *mdsc = &ceph_client(ci->vfs_inode.i_sb)->mdsc;
867a8599bd8SSage Weil 
868a8599bd8SSage Weil 	dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
869a8599bd8SSage Weil 
870a8599bd8SSage Weil 	/* remove from inode list */
871a8599bd8SSage Weil 	rb_erase(&cap->ci_node, &ci->i_caps);
8727c1332b8SSage Weil 	cap->ci = NULL;
873a8599bd8SSage Weil 	if (ci->i_auth_cap == cap)
874a8599bd8SSage Weil 		ci->i_auth_cap = NULL;
875a8599bd8SSage Weil 
8767c1332b8SSage Weil 	/* remove from session list */
8777c1332b8SSage Weil 	spin_lock(&session->s_cap_lock);
8787c1332b8SSage Weil 	if (session->s_cap_iterator == cap) {
8797c1332b8SSage Weil 		/* not yet, we are iterating over this very cap */
8807c1332b8SSage Weil 		dout("__ceph_remove_cap  delaying %p removal from session %p\n",
8817c1332b8SSage Weil 		     cap, cap->session);
8827c1332b8SSage Weil 	} else {
8837c1332b8SSage Weil 		list_del_init(&cap->session_caps);
8847c1332b8SSage Weil 		session->s_nr_caps--;
8857c1332b8SSage Weil 		cap->session = NULL;
8867c1332b8SSage Weil 	}
8877c1332b8SSage Weil 	spin_unlock(&session->s_cap_lock);
8887c1332b8SSage Weil 
8897c1332b8SSage Weil 	if (cap->session == NULL)
8907c1332b8SSage Weil 		ceph_put_cap(cap);
891a8599bd8SSage Weil 
892a8599bd8SSage Weil 	if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) {
893a8599bd8SSage Weil 		struct ceph_snap_realm *realm = ci->i_snap_realm;
894a8599bd8SSage Weil 		spin_lock(&realm->inodes_with_caps_lock);
895a8599bd8SSage Weil 		list_del_init(&ci->i_snap_realm_item);
896a8599bd8SSage Weil 		ci->i_snap_realm_counter++;
897a8599bd8SSage Weil 		ci->i_snap_realm = NULL;
898a8599bd8SSage Weil 		spin_unlock(&realm->inodes_with_caps_lock);
899a8599bd8SSage Weil 		ceph_put_snap_realm(mdsc, realm);
900a8599bd8SSage Weil 	}
901a8599bd8SSage Weil 	if (!__ceph_is_any_real_caps(ci))
902a8599bd8SSage Weil 		__cap_delay_cancel(mdsc, ci);
903a8599bd8SSage Weil }
904a8599bd8SSage Weil 
905a8599bd8SSage Weil /*
906a8599bd8SSage Weil  * Build and send a cap message to the given MDS.
907a8599bd8SSage Weil  *
908a8599bd8SSage Weil  * Caller should be holding s_mutex.
909a8599bd8SSage Weil  */
910a8599bd8SSage Weil static int send_cap_msg(struct ceph_mds_session *session,
911a8599bd8SSage Weil 			u64 ino, u64 cid, int op,
912a8599bd8SSage Weil 			int caps, int wanted, int dirty,
913a8599bd8SSage Weil 			u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq,
914a8599bd8SSage Weil 			u64 size, u64 max_size,
915a8599bd8SSage Weil 			struct timespec *mtime, struct timespec *atime,
916a8599bd8SSage Weil 			u64 time_warp_seq,
917a8599bd8SSage Weil 			uid_t uid, gid_t gid, mode_t mode,
918a8599bd8SSage Weil 			u64 xattr_version,
919a8599bd8SSage Weil 			struct ceph_buffer *xattrs_buf,
920a8599bd8SSage Weil 			u64 follows)
921a8599bd8SSage Weil {
922a8599bd8SSage Weil 	struct ceph_mds_caps *fc;
923a8599bd8SSage Weil 	struct ceph_msg *msg;
924a8599bd8SSage Weil 
925a8599bd8SSage Weil 	dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
926a8599bd8SSage Weil 	     " seq %u/%u mseq %u follows %lld size %llu/%llu"
927a8599bd8SSage Weil 	     " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
928a8599bd8SSage Weil 	     cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
929a8599bd8SSage Weil 	     ceph_cap_string(dirty),
930a8599bd8SSage Weil 	     seq, issue_seq, mseq, follows, size, max_size,
931a8599bd8SSage Weil 	     xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
932a8599bd8SSage Weil 
933a8599bd8SSage Weil 	msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), 0, 0, NULL);
934a8599bd8SSage Weil 	if (IS_ERR(msg))
935a8599bd8SSage Weil 		return PTR_ERR(msg);
936a8599bd8SSage Weil 
9376df058c0SSage Weil 	msg->hdr.tid = cpu_to_le64(flush_tid);
938a8599bd8SSage Weil 
9396df058c0SSage Weil 	fc = msg->front.iov_base;
940a8599bd8SSage Weil 	memset(fc, 0, sizeof(*fc));
941a8599bd8SSage Weil 
942a8599bd8SSage Weil 	fc->cap_id = cpu_to_le64(cid);
943a8599bd8SSage Weil 	fc->op = cpu_to_le32(op);
944a8599bd8SSage Weil 	fc->seq = cpu_to_le32(seq);
945a8599bd8SSage Weil 	fc->issue_seq = cpu_to_le32(issue_seq);
946a8599bd8SSage Weil 	fc->migrate_seq = cpu_to_le32(mseq);
947a8599bd8SSage Weil 	fc->caps = cpu_to_le32(caps);
948a8599bd8SSage Weil 	fc->wanted = cpu_to_le32(wanted);
949a8599bd8SSage Weil 	fc->dirty = cpu_to_le32(dirty);
950a8599bd8SSage Weil 	fc->ino = cpu_to_le64(ino);
951a8599bd8SSage Weil 	fc->snap_follows = cpu_to_le64(follows);
952a8599bd8SSage Weil 
953a8599bd8SSage Weil 	fc->size = cpu_to_le64(size);
954a8599bd8SSage Weil 	fc->max_size = cpu_to_le64(max_size);
955a8599bd8SSage Weil 	if (mtime)
956a8599bd8SSage Weil 		ceph_encode_timespec(&fc->mtime, mtime);
957a8599bd8SSage Weil 	if (atime)
958a8599bd8SSage Weil 		ceph_encode_timespec(&fc->atime, atime);
959a8599bd8SSage Weil 	fc->time_warp_seq = cpu_to_le32(time_warp_seq);
960a8599bd8SSage Weil 
961a8599bd8SSage Weil 	fc->uid = cpu_to_le32(uid);
962a8599bd8SSage Weil 	fc->gid = cpu_to_le32(gid);
963a8599bd8SSage Weil 	fc->mode = cpu_to_le32(mode);
964a8599bd8SSage Weil 
965a8599bd8SSage Weil 	fc->xattr_version = cpu_to_le64(xattr_version);
966a8599bd8SSage Weil 	if (xattrs_buf) {
967a8599bd8SSage Weil 		msg->middle = ceph_buffer_get(xattrs_buf);
968a8599bd8SSage Weil 		fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
969a8599bd8SSage Weil 		msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
970a8599bd8SSage Weil 	}
971a8599bd8SSage Weil 
972a8599bd8SSage Weil 	ceph_con_send(&session->s_con, msg);
973a8599bd8SSage Weil 	return 0;
974a8599bd8SSage Weil }
975a8599bd8SSage Weil 
976a8599bd8SSage Weil /*
977a6369741SSage Weil  * Queue cap releases when an inode is dropped from our cache.  Since
978a6369741SSage Weil  * inode is about to be destroyed, there is no need for i_lock.
979a8599bd8SSage Weil  */
980a8599bd8SSage Weil void ceph_queue_caps_release(struct inode *inode)
981a8599bd8SSage Weil {
982a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
983a8599bd8SSage Weil 	struct rb_node *p;
984a8599bd8SSage Weil 
985a8599bd8SSage Weil 	p = rb_first(&ci->i_caps);
986a8599bd8SSage Weil 	while (p) {
987a8599bd8SSage Weil 		struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
988a8599bd8SSage Weil 		struct ceph_mds_session *session = cap->session;
989a8599bd8SSage Weil 		struct ceph_msg *msg;
990a8599bd8SSage Weil 		struct ceph_mds_cap_release *head;
991a8599bd8SSage Weil 		struct ceph_mds_cap_item *item;
992a8599bd8SSage Weil 
993a8599bd8SSage Weil 		spin_lock(&session->s_cap_lock);
994a8599bd8SSage Weil 		BUG_ON(!session->s_num_cap_releases);
995a8599bd8SSage Weil 		msg = list_first_entry(&session->s_cap_releases,
996a8599bd8SSage Weil 				       struct ceph_msg, list_head);
997a8599bd8SSage Weil 
998a8599bd8SSage Weil 		dout(" adding %p release to mds%d msg %p (%d left)\n",
999a8599bd8SSage Weil 		     inode, session->s_mds, msg, session->s_num_cap_releases);
1000a8599bd8SSage Weil 
1001a8599bd8SSage Weil 		BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE);
1002a8599bd8SSage Weil 		head = msg->front.iov_base;
1003a8599bd8SSage Weil 		head->num = cpu_to_le32(le32_to_cpu(head->num) + 1);
1004a8599bd8SSage Weil 		item = msg->front.iov_base + msg->front.iov_len;
1005a8599bd8SSage Weil 		item->ino = cpu_to_le64(ceph_ino(inode));
1006a8599bd8SSage Weil 		item->cap_id = cpu_to_le64(cap->cap_id);
1007a8599bd8SSage Weil 		item->migrate_seq = cpu_to_le32(cap->mseq);
1008a8599bd8SSage Weil 		item->seq = cpu_to_le32(cap->issue_seq);
1009a8599bd8SSage Weil 
1010a8599bd8SSage Weil 		session->s_num_cap_releases--;
1011a8599bd8SSage Weil 
1012a8599bd8SSage Weil 		msg->front.iov_len += sizeof(*item);
1013a8599bd8SSage Weil 		if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1014a8599bd8SSage Weil 			dout(" release msg %p full\n", msg);
1015a8599bd8SSage Weil 			list_move_tail(&msg->list_head,
1016a8599bd8SSage Weil 				       &session->s_cap_releases_done);
1017a8599bd8SSage Weil 		} else {
1018a8599bd8SSage Weil 			dout(" release msg %p at %d/%d (%d)\n", msg,
1019a8599bd8SSage Weil 			     (int)le32_to_cpu(head->num),
1020a8599bd8SSage Weil 			     (int)CEPH_CAPS_PER_RELEASE,
1021a8599bd8SSage Weil 			     (int)msg->front.iov_len);
1022a8599bd8SSage Weil 		}
1023a8599bd8SSage Weil 		spin_unlock(&session->s_cap_lock);
1024a8599bd8SSage Weil 		p = rb_next(p);
10257c1332b8SSage Weil 		__ceph_remove_cap(cap);
1026a8599bd8SSage Weil 	}
1027a8599bd8SSage Weil }
1028a8599bd8SSage Weil 
1029a8599bd8SSage Weil /*
1030a8599bd8SSage Weil  * Send a cap msg on the given inode.  Update our caps state, then
1031a8599bd8SSage Weil  * drop i_lock and send the message.
1032a8599bd8SSage Weil  *
1033a8599bd8SSage Weil  * Make note of max_size reported/requested from mds, revoked caps
1034a8599bd8SSage Weil  * that have now been implemented.
1035a8599bd8SSage Weil  *
1036a8599bd8SSage Weil  * Make half-hearted attempt ot to invalidate page cache if we are
1037a8599bd8SSage Weil  * dropping RDCACHE.  Note that this will leave behind locked pages
1038a8599bd8SSage Weil  * that we'll then need to deal with elsewhere.
1039a8599bd8SSage Weil  *
1040a8599bd8SSage Weil  * Return non-zero if delayed release, or we experienced an error
1041a8599bd8SSage Weil  * such that the caller should requeue + retry later.
1042a8599bd8SSage Weil  *
1043a8599bd8SSage Weil  * called with i_lock, then drops it.
1044a8599bd8SSage Weil  * caller should hold snap_rwsem (read), s_mutex.
1045a8599bd8SSage Weil  */
1046a8599bd8SSage Weil static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
1047a8599bd8SSage Weil 		      int op, int used, int want, int retain, int flushing,
1048a8599bd8SSage Weil 		      unsigned *pflush_tid)
1049a8599bd8SSage Weil 	__releases(cap->ci->vfs_inode->i_lock)
1050a8599bd8SSage Weil {
1051a8599bd8SSage Weil 	struct ceph_inode_info *ci = cap->ci;
1052a8599bd8SSage Weil 	struct inode *inode = &ci->vfs_inode;
1053a8599bd8SSage Weil 	u64 cap_id = cap->cap_id;
105468c28323SSage Weil 	int held, revoking, dropping, keep;
1055a8599bd8SSage Weil 	u64 seq, issue_seq, mseq, time_warp_seq, follows;
1056a8599bd8SSage Weil 	u64 size, max_size;
1057a8599bd8SSage Weil 	struct timespec mtime, atime;
1058a8599bd8SSage Weil 	int wake = 0;
1059a8599bd8SSage Weil 	mode_t mode;
1060a8599bd8SSage Weil 	uid_t uid;
1061a8599bd8SSage Weil 	gid_t gid;
1062a8599bd8SSage Weil 	struct ceph_mds_session *session;
1063a8599bd8SSage Weil 	u64 xattr_version = 0;
1064a8599bd8SSage Weil 	int delayed = 0;
1065a8599bd8SSage Weil 	u64 flush_tid = 0;
1066a8599bd8SSage Weil 	int i;
1067a8599bd8SSage Weil 	int ret;
1068a8599bd8SSage Weil 
106968c28323SSage Weil 	held = cap->issued | cap->implemented;
107068c28323SSage Weil 	revoking = cap->implemented & ~cap->issued;
107168c28323SSage Weil 	retain &= ~revoking;
107268c28323SSage Weil 	dropping = cap->issued & ~retain;
107368c28323SSage Weil 
1074a8599bd8SSage Weil 	dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1075a8599bd8SSage Weil 	     inode, cap, cap->session,
1076a8599bd8SSage Weil 	     ceph_cap_string(held), ceph_cap_string(held & retain),
1077a8599bd8SSage Weil 	     ceph_cap_string(revoking));
1078a8599bd8SSage Weil 	BUG_ON((retain & CEPH_CAP_PIN) == 0);
1079a8599bd8SSage Weil 
1080a8599bd8SSage Weil 	session = cap->session;
1081a8599bd8SSage Weil 
1082a8599bd8SSage Weil 	/* don't release wanted unless we've waited a bit. */
1083a8599bd8SSage Weil 	if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1084a8599bd8SSage Weil 	    time_before(jiffies, ci->i_hold_caps_min)) {
1085a8599bd8SSage Weil 		dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1086a8599bd8SSage Weil 		     ceph_cap_string(cap->issued),
1087a8599bd8SSage Weil 		     ceph_cap_string(cap->issued & retain),
1088a8599bd8SSage Weil 		     ceph_cap_string(cap->mds_wanted),
1089a8599bd8SSage Weil 		     ceph_cap_string(want));
1090a8599bd8SSage Weil 		want |= cap->mds_wanted;
1091a8599bd8SSage Weil 		retain |= cap->issued;
1092a8599bd8SSage Weil 		delayed = 1;
1093a8599bd8SSage Weil 	}
1094a8599bd8SSage Weil 	ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
1095a8599bd8SSage Weil 
1096a8599bd8SSage Weil 	cap->issued &= retain;  /* drop bits we don't want */
1097a8599bd8SSage Weil 	if (cap->implemented & ~cap->issued) {
1098a8599bd8SSage Weil 		/*
1099a8599bd8SSage Weil 		 * Wake up any waiters on wanted -> needed transition.
1100a8599bd8SSage Weil 		 * This is due to the weird transition from buffered
1101a8599bd8SSage Weil 		 * to sync IO... we need to flush dirty pages _before_
1102a8599bd8SSage Weil 		 * allowing sync writes to avoid reordering.
1103a8599bd8SSage Weil 		 */
1104a8599bd8SSage Weil 		wake = 1;
1105a8599bd8SSage Weil 	}
1106a8599bd8SSage Weil 	cap->implemented &= cap->issued | used;
1107a8599bd8SSage Weil 	cap->mds_wanted = want;
1108a8599bd8SSage Weil 
1109a8599bd8SSage Weil 	if (flushing) {
1110a8599bd8SSage Weil 		/*
1111a8599bd8SSage Weil 		 * assign a tid for flush operations so we can avoid
1112a8599bd8SSage Weil 		 * flush1 -> dirty1 -> flush2 -> flushack1 -> mark
1113a8599bd8SSage Weil 		 * clean type races.  track latest tid for every bit
1114a8599bd8SSage Weil 		 * so we can handle flush AxFw, flush Fw, and have the
1115a8599bd8SSage Weil 		 * first ack clean Ax.
1116a8599bd8SSage Weil 		 */
1117a8599bd8SSage Weil 		flush_tid = ++ci->i_cap_flush_last_tid;
1118a8599bd8SSage Weil 		if (pflush_tid)
1119a8599bd8SSage Weil 			*pflush_tid = flush_tid;
1120a8599bd8SSage Weil 		dout(" cap_flush_tid %d\n", (int)flush_tid);
1121a8599bd8SSage Weil 		for (i = 0; i < CEPH_CAP_BITS; i++)
1122a8599bd8SSage Weil 			if (flushing & (1 << i))
1123a8599bd8SSage Weil 				ci->i_cap_flush_tid[i] = flush_tid;
1124a8599bd8SSage Weil 	}
1125a8599bd8SSage Weil 
1126a8599bd8SSage Weil 	keep = cap->implemented;
1127a8599bd8SSage Weil 	seq = cap->seq;
1128a8599bd8SSage Weil 	issue_seq = cap->issue_seq;
1129a8599bd8SSage Weil 	mseq = cap->mseq;
1130a8599bd8SSage Weil 	size = inode->i_size;
1131a8599bd8SSage Weil 	ci->i_reported_size = size;
1132a8599bd8SSage Weil 	max_size = ci->i_wanted_max_size;
1133a8599bd8SSage Weil 	ci->i_requested_max_size = max_size;
1134a8599bd8SSage Weil 	mtime = inode->i_mtime;
1135a8599bd8SSage Weil 	atime = inode->i_atime;
1136a8599bd8SSage Weil 	time_warp_seq = ci->i_time_warp_seq;
1137a8599bd8SSage Weil 	follows = ci->i_snap_realm->cached_context->seq;
1138a8599bd8SSage Weil 	uid = inode->i_uid;
1139a8599bd8SSage Weil 	gid = inode->i_gid;
1140a8599bd8SSage Weil 	mode = inode->i_mode;
1141a8599bd8SSage Weil 
1142a8599bd8SSage Weil 	if (dropping & CEPH_CAP_XATTR_EXCL) {
1143a8599bd8SSage Weil 		__ceph_build_xattrs_blob(ci);
1144a8599bd8SSage Weil 		xattr_version = ci->i_xattrs.version + 1;
1145a8599bd8SSage Weil 	}
1146a8599bd8SSage Weil 
1147a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
1148a8599bd8SSage Weil 
1149a8599bd8SSage Weil 	ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
1150a8599bd8SSage Weil 		op, keep, want, flushing, seq, flush_tid, issue_seq, mseq,
1151a8599bd8SSage Weil 		size, max_size, &mtime, &atime, time_warp_seq,
1152a8599bd8SSage Weil 		uid, gid, mode,
1153a8599bd8SSage Weil 		xattr_version,
1154a8599bd8SSage Weil 		(flushing & CEPH_CAP_XATTR_EXCL) ? ci->i_xattrs.blob : NULL,
1155a8599bd8SSage Weil 		follows);
1156a8599bd8SSage Weil 	if (ret < 0) {
1157a8599bd8SSage Weil 		dout("error sending cap msg, must requeue %p\n", inode);
1158a8599bd8SSage Weil 		delayed = 1;
1159a8599bd8SSage Weil 	}
1160a8599bd8SSage Weil 
1161a8599bd8SSage Weil 	if (wake)
1162a8599bd8SSage Weil 		wake_up(&ci->i_cap_wq);
1163a8599bd8SSage Weil 
1164a8599bd8SSage Weil 	return delayed;
1165a8599bd8SSage Weil }
1166a8599bd8SSage Weil 
1167a8599bd8SSage Weil /*
1168a8599bd8SSage Weil  * When a snapshot is taken, clients accumulate dirty metadata on
1169a8599bd8SSage Weil  * inodes with capabilities in ceph_cap_snaps to describe the file
1170a8599bd8SSage Weil  * state at the time the snapshot was taken.  This must be flushed
1171a8599bd8SSage Weil  * asynchronously back to the MDS once sync writes complete and dirty
1172a8599bd8SSage Weil  * data is written out.
1173a8599bd8SSage Weil  *
1174a8599bd8SSage Weil  * Called under i_lock.  Takes s_mutex as needed.
1175a8599bd8SSage Weil  */
1176a8599bd8SSage Weil void __ceph_flush_snaps(struct ceph_inode_info *ci,
1177a8599bd8SSage Weil 			struct ceph_mds_session **psession)
1178a8599bd8SSage Weil {
1179a8599bd8SSage Weil 	struct inode *inode = &ci->vfs_inode;
1180a8599bd8SSage Weil 	int mds;
1181a8599bd8SSage Weil 	struct ceph_cap_snap *capsnap;
1182a8599bd8SSage Weil 	u32 mseq;
1183a8599bd8SSage Weil 	struct ceph_mds_client *mdsc = &ceph_inode_to_client(inode)->mdsc;
1184a8599bd8SSage Weil 	struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
1185a8599bd8SSage Weil 						    session->s_mutex */
1186a8599bd8SSage Weil 	u64 next_follows = 0;  /* keep track of how far we've gotten through the
1187a8599bd8SSage Weil 			     i_cap_snaps list, and skip these entries next time
1188a8599bd8SSage Weil 			     around to avoid an infinite loop */
1189a8599bd8SSage Weil 
1190a8599bd8SSage Weil 	if (psession)
1191a8599bd8SSage Weil 		session = *psession;
1192a8599bd8SSage Weil 
1193a8599bd8SSage Weil 	dout("__flush_snaps %p\n", inode);
1194a8599bd8SSage Weil retry:
1195a8599bd8SSage Weil 	list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1196a8599bd8SSage Weil 		/* avoid an infiniute loop after retry */
1197a8599bd8SSage Weil 		if (capsnap->follows < next_follows)
1198a8599bd8SSage Weil 			continue;
1199a8599bd8SSage Weil 		/*
1200a8599bd8SSage Weil 		 * we need to wait for sync writes to complete and for dirty
1201a8599bd8SSage Weil 		 * pages to be written out.
1202a8599bd8SSage Weil 		 */
1203a8599bd8SSage Weil 		if (capsnap->dirty_pages || capsnap->writing)
1204a8599bd8SSage Weil 			continue;
1205a8599bd8SSage Weil 
1206a8599bd8SSage Weil 		/* pick mds, take s_mutex */
1207a8599bd8SSage Weil 		mds = __ceph_get_cap_mds(ci, &mseq);
1208a8599bd8SSage Weil 		if (session && session->s_mds != mds) {
1209a8599bd8SSage Weil 			dout("oops, wrong session %p mutex\n", session);
1210a8599bd8SSage Weil 			mutex_unlock(&session->s_mutex);
1211a8599bd8SSage Weil 			ceph_put_mds_session(session);
1212a8599bd8SSage Weil 			session = NULL;
1213a8599bd8SSage Weil 		}
1214a8599bd8SSage Weil 		if (!session) {
1215a8599bd8SSage Weil 			spin_unlock(&inode->i_lock);
1216a8599bd8SSage Weil 			mutex_lock(&mdsc->mutex);
1217a8599bd8SSage Weil 			session = __ceph_lookup_mds_session(mdsc, mds);
1218a8599bd8SSage Weil 			mutex_unlock(&mdsc->mutex);
1219a8599bd8SSage Weil 			if (session) {
1220a8599bd8SSage Weil 				dout("inverting session/ino locks on %p\n",
1221a8599bd8SSage Weil 				     session);
1222a8599bd8SSage Weil 				mutex_lock(&session->s_mutex);
1223a8599bd8SSage Weil 			}
1224a8599bd8SSage Weil 			/*
1225a8599bd8SSage Weil 			 * if session == NULL, we raced against a cap
1226a8599bd8SSage Weil 			 * deletion.  retry, and we'll get a better
1227a8599bd8SSage Weil 			 * @mds value next time.
1228a8599bd8SSage Weil 			 */
1229a8599bd8SSage Weil 			spin_lock(&inode->i_lock);
1230a8599bd8SSage Weil 			goto retry;
1231a8599bd8SSage Weil 		}
1232a8599bd8SSage Weil 
1233a8599bd8SSage Weil 		capsnap->flush_tid = ++ci->i_cap_flush_last_tid;
1234a8599bd8SSage Weil 		atomic_inc(&capsnap->nref);
1235a8599bd8SSage Weil 		if (!list_empty(&capsnap->flushing_item))
1236a8599bd8SSage Weil 			list_del_init(&capsnap->flushing_item);
1237a8599bd8SSage Weil 		list_add_tail(&capsnap->flushing_item,
1238a8599bd8SSage Weil 			      &session->s_cap_snaps_flushing);
1239a8599bd8SSage Weil 		spin_unlock(&inode->i_lock);
1240a8599bd8SSage Weil 
1241a8599bd8SSage Weil 		dout("flush_snaps %p cap_snap %p follows %lld size %llu\n",
1242a8599bd8SSage Weil 		     inode, capsnap, next_follows, capsnap->size);
1243a8599bd8SSage Weil 		send_cap_msg(session, ceph_vino(inode).ino, 0,
1244a8599bd8SSage Weil 			     CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
1245a8599bd8SSage Weil 			     capsnap->dirty, 0, capsnap->flush_tid, 0, mseq,
1246a8599bd8SSage Weil 			     capsnap->size, 0,
1247a8599bd8SSage Weil 			     &capsnap->mtime, &capsnap->atime,
1248a8599bd8SSage Weil 			     capsnap->time_warp_seq,
1249a8599bd8SSage Weil 			     capsnap->uid, capsnap->gid, capsnap->mode,
1250a8599bd8SSage Weil 			     0, NULL,
1251a8599bd8SSage Weil 			     capsnap->follows);
1252a8599bd8SSage Weil 
1253a8599bd8SSage Weil 		next_follows = capsnap->follows + 1;
1254a8599bd8SSage Weil 		ceph_put_cap_snap(capsnap);
1255a8599bd8SSage Weil 
1256a8599bd8SSage Weil 		spin_lock(&inode->i_lock);
1257a8599bd8SSage Weil 		goto retry;
1258a8599bd8SSage Weil 	}
1259a8599bd8SSage Weil 
1260a8599bd8SSage Weil 	/* we flushed them all; remove this inode from the queue */
1261a8599bd8SSage Weil 	spin_lock(&mdsc->snap_flush_lock);
1262a8599bd8SSage Weil 	list_del_init(&ci->i_snap_flush_item);
1263a8599bd8SSage Weil 	spin_unlock(&mdsc->snap_flush_lock);
1264a8599bd8SSage Weil 
1265a8599bd8SSage Weil 	if (psession)
1266a8599bd8SSage Weil 		*psession = session;
1267a8599bd8SSage Weil 	else if (session) {
1268a8599bd8SSage Weil 		mutex_unlock(&session->s_mutex);
1269a8599bd8SSage Weil 		ceph_put_mds_session(session);
1270a8599bd8SSage Weil 	}
1271a8599bd8SSage Weil }
1272a8599bd8SSage Weil 
1273a8599bd8SSage Weil static void ceph_flush_snaps(struct ceph_inode_info *ci)
1274a8599bd8SSage Weil {
1275a8599bd8SSage Weil 	struct inode *inode = &ci->vfs_inode;
1276a8599bd8SSage Weil 
1277a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
1278a8599bd8SSage Weil 	__ceph_flush_snaps(ci, NULL);
1279a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
1280a8599bd8SSage Weil }
1281a8599bd8SSage Weil 
1282a8599bd8SSage Weil /*
128376e3b390SSage Weil  * Mark caps dirty.  If inode is newly dirty, add to the global dirty
128476e3b390SSage Weil  * list.
128576e3b390SSage Weil  */
128676e3b390SSage Weil void __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask)
128776e3b390SSage Weil {
128876e3b390SSage Weil 	struct ceph_mds_client *mdsc = &ceph_client(ci->vfs_inode.i_sb)->mdsc;
128976e3b390SSage Weil 	struct inode *inode = &ci->vfs_inode;
129076e3b390SSage Weil 	int was = ci->i_dirty_caps;
129176e3b390SSage Weil 	int dirty = 0;
129276e3b390SSage Weil 
129376e3b390SSage Weil 	dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
129476e3b390SSage Weil 	     ceph_cap_string(mask), ceph_cap_string(was),
129576e3b390SSage Weil 	     ceph_cap_string(was | mask));
129676e3b390SSage Weil 	ci->i_dirty_caps |= mask;
129776e3b390SSage Weil 	if (was == 0) {
129876e3b390SSage Weil 		dout(" inode %p now dirty\n", &ci->vfs_inode);
129976e3b390SSage Weil 		BUG_ON(!list_empty(&ci->i_dirty_item));
130076e3b390SSage Weil 		spin_lock(&mdsc->cap_dirty_lock);
130176e3b390SSage Weil 		list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
130276e3b390SSage Weil 		spin_unlock(&mdsc->cap_dirty_lock);
130376e3b390SSage Weil 		if (ci->i_flushing_caps == 0) {
130476e3b390SSage Weil 			igrab(inode);
130576e3b390SSage Weil 			dirty |= I_DIRTY_SYNC;
130676e3b390SSage Weil 		}
130776e3b390SSage Weil 	}
130876e3b390SSage Weil 	BUG_ON(list_empty(&ci->i_dirty_item));
130976e3b390SSage Weil 	if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
131076e3b390SSage Weil 	    (mask & CEPH_CAP_FILE_BUFFER))
131176e3b390SSage Weil 		dirty |= I_DIRTY_DATASYNC;
131276e3b390SSage Weil 	if (dirty)
131376e3b390SSage Weil 		__mark_inode_dirty(inode, dirty);
131476e3b390SSage Weil 	__cap_delay_requeue(mdsc, ci);
131576e3b390SSage Weil }
131676e3b390SSage Weil 
131776e3b390SSage Weil /*
1318a8599bd8SSage Weil  * Add dirty inode to the flushing list.  Assigned a seq number so we
1319a8599bd8SSage Weil  * can wait for caps to flush without starving.
1320cdc35f96SSage Weil  *
1321cdc35f96SSage Weil  * Called under i_lock.
1322a8599bd8SSage Weil  */
1323cdc35f96SSage Weil static int __mark_caps_flushing(struct inode *inode,
1324a8599bd8SSage Weil 				 struct ceph_mds_session *session)
1325a8599bd8SSage Weil {
1326a8599bd8SSage Weil 	struct ceph_mds_client *mdsc = &ceph_client(inode->i_sb)->mdsc;
1327a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
1328cdc35f96SSage Weil 	int flushing;
1329a8599bd8SSage Weil 
1330cdc35f96SSage Weil 	BUG_ON(ci->i_dirty_caps == 0);
1331a8599bd8SSage Weil 	BUG_ON(list_empty(&ci->i_dirty_item));
1332cdc35f96SSage Weil 
1333cdc35f96SSage Weil 	flushing = ci->i_dirty_caps;
1334cdc35f96SSage Weil 	dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1335cdc35f96SSage Weil 	     ceph_cap_string(flushing),
1336cdc35f96SSage Weil 	     ceph_cap_string(ci->i_flushing_caps),
1337cdc35f96SSage Weil 	     ceph_cap_string(ci->i_flushing_caps | flushing));
1338cdc35f96SSage Weil 	ci->i_flushing_caps |= flushing;
1339cdc35f96SSage Weil 	ci->i_dirty_caps = 0;
1340afcdaea3SSage Weil 	dout(" inode %p now !dirty\n", inode);
1341cdc35f96SSage Weil 
1342a8599bd8SSage Weil 	spin_lock(&mdsc->cap_dirty_lock);
1343cdc35f96SSage Weil 	list_del_init(&ci->i_dirty_item);
1344afcdaea3SSage Weil 
1345afcdaea3SSage Weil 	ci->i_cap_flush_seq = ++mdsc->cap_flush_seq;
1346afcdaea3SSage Weil 	if (list_empty(&ci->i_flushing_item)) {
1347a8599bd8SSage Weil 		list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1348a8599bd8SSage Weil 		mdsc->num_cap_flushing++;
1349afcdaea3SSage Weil 		dout(" inode %p now flushing seq %lld\n", inode,
1350afcdaea3SSage Weil 		     ci->i_cap_flush_seq);
1351afcdaea3SSage Weil 	} else {
1352afcdaea3SSage Weil 		list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1353afcdaea3SSage Weil 		dout(" inode %p now flushing (more) seq %lld\n", inode,
1354a8599bd8SSage Weil 		     ci->i_cap_flush_seq);
1355a8599bd8SSage Weil 	}
1356a8599bd8SSage Weil 	spin_unlock(&mdsc->cap_dirty_lock);
1357cdc35f96SSage Weil 
1358cdc35f96SSage Weil 	return flushing;
1359a8599bd8SSage Weil }
1360a8599bd8SSage Weil 
1361a8599bd8SSage Weil /*
13625ecad6fdSSage Weil  * try to invalidate mapping pages without blocking.
13635ecad6fdSSage Weil  */
13645ecad6fdSSage Weil static int mapping_is_empty(struct address_space *mapping)
13655ecad6fdSSage Weil {
13665ecad6fdSSage Weil 	struct page *page = find_get_page(mapping, 0);
13675ecad6fdSSage Weil 
13685ecad6fdSSage Weil 	if (!page)
13695ecad6fdSSage Weil 		return 1;
13705ecad6fdSSage Weil 
13715ecad6fdSSage Weil 	put_page(page);
13725ecad6fdSSage Weil 	return 0;
13735ecad6fdSSage Weil }
13745ecad6fdSSage Weil 
13755ecad6fdSSage Weil static int try_nonblocking_invalidate(struct inode *inode)
13765ecad6fdSSage Weil {
13775ecad6fdSSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
13785ecad6fdSSage Weil 	u32 invalidating_gen = ci->i_rdcache_gen;
13795ecad6fdSSage Weil 
13805ecad6fdSSage Weil 	spin_unlock(&inode->i_lock);
13815ecad6fdSSage Weil 	invalidate_mapping_pages(&inode->i_data, 0, -1);
13825ecad6fdSSage Weil 	spin_lock(&inode->i_lock);
13835ecad6fdSSage Weil 
13845ecad6fdSSage Weil 	if (mapping_is_empty(&inode->i_data) &&
13855ecad6fdSSage Weil 	    invalidating_gen == ci->i_rdcache_gen) {
13865ecad6fdSSage Weil 		/* success. */
13875ecad6fdSSage Weil 		dout("try_nonblocking_invalidate %p success\n", inode);
13885ecad6fdSSage Weil 		ci->i_rdcache_gen = 0;
13895ecad6fdSSage Weil 		ci->i_rdcache_revoking = 0;
13905ecad6fdSSage Weil 		return 0;
13915ecad6fdSSage Weil 	}
13925ecad6fdSSage Weil 	dout("try_nonblocking_invalidate %p failed\n", inode);
13935ecad6fdSSage Weil 	return -1;
13945ecad6fdSSage Weil }
13955ecad6fdSSage Weil 
13965ecad6fdSSage Weil /*
1397a8599bd8SSage Weil  * Swiss army knife function to examine currently used and wanted
1398a8599bd8SSage Weil  * versus held caps.  Release, flush, ack revoked caps to mds as
1399a8599bd8SSage Weil  * appropriate.
1400a8599bd8SSage Weil  *
1401a8599bd8SSage Weil  *  CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1402a8599bd8SSage Weil  *    cap release further.
1403a8599bd8SSage Weil  *  CHECK_CAPS_AUTHONLY - we should only check the auth cap
1404a8599bd8SSage Weil  *  CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1405a8599bd8SSage Weil  *    further delay.
1406a8599bd8SSage Weil  */
1407a8599bd8SSage Weil void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1408a8599bd8SSage Weil 		     struct ceph_mds_session *session)
1409a8599bd8SSage Weil {
1410a8599bd8SSage Weil 	struct ceph_client *client = ceph_inode_to_client(&ci->vfs_inode);
1411a8599bd8SSage Weil 	struct ceph_mds_client *mdsc = &client->mdsc;
1412a8599bd8SSage Weil 	struct inode *inode = &ci->vfs_inode;
1413a8599bd8SSage Weil 	struct ceph_cap *cap;
1414a8599bd8SSage Weil 	int file_wanted, used;
1415a8599bd8SSage Weil 	int took_snap_rwsem = 0;             /* true if mdsc->snap_rwsem held */
1416a8599bd8SSage Weil 	int drop_session_lock = session ? 0 : 1;
1417cbd03635SSage Weil 	int issued, implemented, want, retain, revoking, flushing = 0;
1418a8599bd8SSage Weil 	int mds = -1;   /* keep track of how far we've gone through i_caps list
1419a8599bd8SSage Weil 			   to avoid an infinite loop on retry */
1420a8599bd8SSage Weil 	struct rb_node *p;
1421a8599bd8SSage Weil 	int tried_invalidate = 0;
1422a8599bd8SSage Weil 	int delayed = 0, sent = 0, force_requeue = 0, num;
1423cbd03635SSage Weil 	int queue_invalidate = 0;
1424a8599bd8SSage Weil 	int is_delayed = flags & CHECK_CAPS_NODELAY;
1425a8599bd8SSage Weil 
1426a8599bd8SSage Weil 	/* if we are unmounting, flush any unused caps immediately. */
1427a8599bd8SSage Weil 	if (mdsc->stopping)
1428a8599bd8SSage Weil 		is_delayed = 1;
1429a8599bd8SSage Weil 
1430a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
1431a8599bd8SSage Weil 
1432a8599bd8SSage Weil 	if (ci->i_ceph_flags & CEPH_I_FLUSH)
1433a8599bd8SSage Weil 		flags |= CHECK_CAPS_FLUSH;
1434a8599bd8SSage Weil 
1435a8599bd8SSage Weil 	/* flush snaps first time around only */
1436a8599bd8SSage Weil 	if (!list_empty(&ci->i_cap_snaps))
1437a8599bd8SSage Weil 		__ceph_flush_snaps(ci, &session);
1438a8599bd8SSage Weil 	goto retry_locked;
1439a8599bd8SSage Weil retry:
1440a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
1441a8599bd8SSage Weil retry_locked:
1442a8599bd8SSage Weil 	file_wanted = __ceph_caps_file_wanted(ci);
1443a8599bd8SSage Weil 	used = __ceph_caps_used(ci);
1444a8599bd8SSage Weil 	want = file_wanted | used;
1445cbd03635SSage Weil 	issued = __ceph_caps_issued(ci, &implemented);
1446cbd03635SSage Weil 	revoking = implemented & ~issued;
1447a8599bd8SSage Weil 
1448a8599bd8SSage Weil 	retain = want | CEPH_CAP_PIN;
1449a8599bd8SSage Weil 	if (!mdsc->stopping && inode->i_nlink > 0) {
1450a8599bd8SSage Weil 		if (want) {
1451a8599bd8SSage Weil 			retain |= CEPH_CAP_ANY;       /* be greedy */
1452a8599bd8SSage Weil 		} else {
1453a8599bd8SSage Weil 			retain |= CEPH_CAP_ANY_SHARED;
1454a8599bd8SSage Weil 			/*
1455a8599bd8SSage Weil 			 * keep RD only if we didn't have the file open RW,
1456a8599bd8SSage Weil 			 * because then the mds would revoke it anyway to
1457a8599bd8SSage Weil 			 * journal max_size=0.
1458a8599bd8SSage Weil 			 */
1459a8599bd8SSage Weil 			if (ci->i_max_size == 0)
1460a8599bd8SSage Weil 				retain |= CEPH_CAP_ANY_RD;
1461a8599bd8SSage Weil 		}
1462a8599bd8SSage Weil 	}
1463a8599bd8SSage Weil 
1464a8599bd8SSage Weil 	dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1465cbd03635SSage Weil 	     " issued %s revoking %s retain %s %s%s%s\n", inode,
1466a8599bd8SSage Weil 	     ceph_cap_string(file_wanted),
1467a8599bd8SSage Weil 	     ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1468a8599bd8SSage Weil 	     ceph_cap_string(ci->i_flushing_caps),
1469cbd03635SSage Weil 	     ceph_cap_string(issued), ceph_cap_string(revoking),
1470a8599bd8SSage Weil 	     ceph_cap_string(retain),
1471a8599bd8SSage Weil 	     (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1472a8599bd8SSage Weil 	     (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
1473a8599bd8SSage Weil 	     (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1474a8599bd8SSage Weil 
1475a8599bd8SSage Weil 	/*
1476a8599bd8SSage Weil 	 * If we no longer need to hold onto old our caps, and we may
1477a8599bd8SSage Weil 	 * have cached pages, but don't want them, then try to invalidate.
1478a8599bd8SSage Weil 	 * If we fail, it's because pages are locked.... try again later.
1479a8599bd8SSage Weil 	 */
1480a8599bd8SSage Weil 	if ((!is_delayed || mdsc->stopping) &&
1481a8599bd8SSage Weil 	    ci->i_wrbuffer_ref == 0 &&               /* no dirty pages... */
1482a8599bd8SSage Weil 	    ci->i_rdcache_gen &&                     /* may have cached pages */
1483cbd03635SSage Weil 	    (file_wanted == 0 ||                     /* no open files */
1484cbd03635SSage Weil 	     (revoking & CEPH_CAP_FILE_CACHE)) &&     /*  or revoking cache */
1485a8599bd8SSage Weil 	    !tried_invalidate) {
1486a8599bd8SSage Weil 		dout("check_caps trying to invalidate on %p\n", inode);
14875ecad6fdSSage Weil 		if (try_nonblocking_invalidate(inode) < 0) {
14885ecad6fdSSage Weil 			if (revoking & CEPH_CAP_FILE_CACHE) {
1489cbd03635SSage Weil 				dout("check_caps queuing invalidate\n");
1490cbd03635SSage Weil 				queue_invalidate = 1;
1491cbd03635SSage Weil 				ci->i_rdcache_revoking = ci->i_rdcache_gen;
1492a8599bd8SSage Weil 			} else {
1493a8599bd8SSage Weil 				dout("check_caps failed to invalidate pages\n");
1494a8599bd8SSage Weil 				/* we failed to invalidate pages.  check these
1495a8599bd8SSage Weil 				   caps again later. */
1496a8599bd8SSage Weil 				force_requeue = 1;
1497a8599bd8SSage Weil 				__cap_set_timeouts(mdsc, ci);
1498a8599bd8SSage Weil 			}
14995ecad6fdSSage Weil 		}
1500a8599bd8SSage Weil 		tried_invalidate = 1;
1501a8599bd8SSage Weil 		goto retry_locked;
1502a8599bd8SSage Weil 	}
1503a8599bd8SSage Weil 
1504a8599bd8SSage Weil 	num = 0;
1505a8599bd8SSage Weil 	for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1506a8599bd8SSage Weil 		cap = rb_entry(p, struct ceph_cap, ci_node);
1507a8599bd8SSage Weil 		num++;
1508a8599bd8SSage Weil 
1509a8599bd8SSage Weil 		/* avoid looping forever */
1510a8599bd8SSage Weil 		if (mds >= cap->mds ||
1511a8599bd8SSage Weil 		    ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
1512a8599bd8SSage Weil 			continue;
1513a8599bd8SSage Weil 
1514a8599bd8SSage Weil 		/* NOTE: no side-effects allowed, until we take s_mutex */
1515a8599bd8SSage Weil 
1516a8599bd8SSage Weil 		revoking = cap->implemented & ~cap->issued;
1517a8599bd8SSage Weil 		if (revoking)
1518a8599bd8SSage Weil 			dout(" mds%d revoking %s\n", cap->mds,
1519a8599bd8SSage Weil 			     ceph_cap_string(revoking));
1520a8599bd8SSage Weil 
1521a8599bd8SSage Weil 		if (cap == ci->i_auth_cap &&
1522a8599bd8SSage Weil 		    (cap->issued & CEPH_CAP_FILE_WR)) {
1523a8599bd8SSage Weil 			/* request larger max_size from MDS? */
1524a8599bd8SSage Weil 			if (ci->i_wanted_max_size > ci->i_max_size &&
1525a8599bd8SSage Weil 			    ci->i_wanted_max_size > ci->i_requested_max_size) {
1526a8599bd8SSage Weil 				dout("requesting new max_size\n");
1527a8599bd8SSage Weil 				goto ack;
1528a8599bd8SSage Weil 			}
1529a8599bd8SSage Weil 
1530a8599bd8SSage Weil 			/* approaching file_max? */
1531a8599bd8SSage Weil 			if ((inode->i_size << 1) >= ci->i_max_size &&
1532a8599bd8SSage Weil 			    (ci->i_reported_size << 1) < ci->i_max_size) {
1533a8599bd8SSage Weil 				dout("i_size approaching max_size\n");
1534a8599bd8SSage Weil 				goto ack;
1535a8599bd8SSage Weil 			}
1536a8599bd8SSage Weil 		}
1537a8599bd8SSage Weil 		/* flush anything dirty? */
1538a8599bd8SSage Weil 		if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
1539a8599bd8SSage Weil 		    ci->i_dirty_caps) {
1540a8599bd8SSage Weil 			dout("flushing dirty caps\n");
1541a8599bd8SSage Weil 			goto ack;
1542a8599bd8SSage Weil 		}
1543a8599bd8SSage Weil 
1544a8599bd8SSage Weil 		/* completed revocation? going down and there are no caps? */
1545a8599bd8SSage Weil 		if (revoking && (revoking & used) == 0) {
1546a8599bd8SSage Weil 			dout("completed revocation of %s\n",
1547a8599bd8SSage Weil 			     ceph_cap_string(cap->implemented & ~cap->issued));
1548a8599bd8SSage Weil 			goto ack;
1549a8599bd8SSage Weil 		}
1550a8599bd8SSage Weil 
1551a8599bd8SSage Weil 		/* want more caps from mds? */
1552a8599bd8SSage Weil 		if (want & ~(cap->mds_wanted | cap->issued))
1553a8599bd8SSage Weil 			goto ack;
1554a8599bd8SSage Weil 
1555a8599bd8SSage Weil 		/* things we might delay */
1556a8599bd8SSage Weil 		if ((cap->issued & ~retain) == 0 &&
1557a8599bd8SSage Weil 		    cap->mds_wanted == want)
1558a8599bd8SSage Weil 			continue;     /* nope, all good */
1559a8599bd8SSage Weil 
1560a8599bd8SSage Weil 		if (is_delayed)
1561a8599bd8SSage Weil 			goto ack;
1562a8599bd8SSage Weil 
1563a8599bd8SSage Weil 		/* delay? */
1564a8599bd8SSage Weil 		if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1565a8599bd8SSage Weil 		    time_before(jiffies, ci->i_hold_caps_max)) {
1566a8599bd8SSage Weil 			dout(" delaying issued %s -> %s, wanted %s -> %s\n",
1567a8599bd8SSage Weil 			     ceph_cap_string(cap->issued),
1568a8599bd8SSage Weil 			     ceph_cap_string(cap->issued & retain),
1569a8599bd8SSage Weil 			     ceph_cap_string(cap->mds_wanted),
1570a8599bd8SSage Weil 			     ceph_cap_string(want));
1571a8599bd8SSage Weil 			delayed++;
1572a8599bd8SSage Weil 			continue;
1573a8599bd8SSage Weil 		}
1574a8599bd8SSage Weil 
1575a8599bd8SSage Weil ack:
1576a8599bd8SSage Weil 		if (session && session != cap->session) {
1577a8599bd8SSage Weil 			dout("oops, wrong session %p mutex\n", session);
1578a8599bd8SSage Weil 			mutex_unlock(&session->s_mutex);
1579a8599bd8SSage Weil 			session = NULL;
1580a8599bd8SSage Weil 		}
1581a8599bd8SSage Weil 		if (!session) {
1582a8599bd8SSage Weil 			session = cap->session;
1583a8599bd8SSage Weil 			if (mutex_trylock(&session->s_mutex) == 0) {
1584a8599bd8SSage Weil 				dout("inverting session/ino locks on %p\n",
1585a8599bd8SSage Weil 				     session);
1586a8599bd8SSage Weil 				spin_unlock(&inode->i_lock);
1587a8599bd8SSage Weil 				if (took_snap_rwsem) {
1588a8599bd8SSage Weil 					up_read(&mdsc->snap_rwsem);
1589a8599bd8SSage Weil 					took_snap_rwsem = 0;
1590a8599bd8SSage Weil 				}
1591a8599bd8SSage Weil 				mutex_lock(&session->s_mutex);
1592a8599bd8SSage Weil 				goto retry;
1593a8599bd8SSage Weil 			}
1594a8599bd8SSage Weil 		}
1595a8599bd8SSage Weil 		/* take snap_rwsem after session mutex */
1596a8599bd8SSage Weil 		if (!took_snap_rwsem) {
1597a8599bd8SSage Weil 			if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
1598a8599bd8SSage Weil 				dout("inverting snap/in locks on %p\n",
1599a8599bd8SSage Weil 				     inode);
1600a8599bd8SSage Weil 				spin_unlock(&inode->i_lock);
1601a8599bd8SSage Weil 				down_read(&mdsc->snap_rwsem);
1602a8599bd8SSage Weil 				took_snap_rwsem = 1;
1603a8599bd8SSage Weil 				goto retry;
1604a8599bd8SSage Weil 			}
1605a8599bd8SSage Weil 			took_snap_rwsem = 1;
1606a8599bd8SSage Weil 		}
1607a8599bd8SSage Weil 
1608cdc35f96SSage Weil 		if (cap == ci->i_auth_cap && ci->i_dirty_caps)
1609cdc35f96SSage Weil 			flushing = __mark_caps_flushing(inode, session);
1610a8599bd8SSage Weil 
1611a8599bd8SSage Weil 		mds = cap->mds;  /* remember mds, so we don't repeat */
1612a8599bd8SSage Weil 		sent++;
1613a8599bd8SSage Weil 
1614a8599bd8SSage Weil 		/* __send_cap drops i_lock */
1615a8599bd8SSage Weil 		delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, used, want,
1616a8599bd8SSage Weil 				      retain, flushing, NULL);
1617a8599bd8SSage Weil 		goto retry; /* retake i_lock and restart our cap scan. */
1618a8599bd8SSage Weil 	}
1619a8599bd8SSage Weil 
1620a8599bd8SSage Weil 	/*
1621a8599bd8SSage Weil 	 * Reschedule delayed caps release if we delayed anything,
1622a8599bd8SSage Weil 	 * otherwise cancel.
1623a8599bd8SSage Weil 	 */
1624a8599bd8SSage Weil 	if (delayed && is_delayed)
1625a8599bd8SSage Weil 		force_requeue = 1;   /* __send_cap delayed release; requeue */
1626a8599bd8SSage Weil 	if (!delayed && !is_delayed)
1627a8599bd8SSage Weil 		__cap_delay_cancel(mdsc, ci);
1628a8599bd8SSage Weil 	else if (!is_delayed || force_requeue)
1629a8599bd8SSage Weil 		__cap_delay_requeue(mdsc, ci);
1630a8599bd8SSage Weil 
1631a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
1632a8599bd8SSage Weil 
1633cbd03635SSage Weil 	if (queue_invalidate)
16343c6f6b79SSage Weil 		ceph_queue_invalidate(inode);
1635cbd03635SSage Weil 
1636a8599bd8SSage Weil 	if (session && drop_session_lock)
1637a8599bd8SSage Weil 		mutex_unlock(&session->s_mutex);
1638a8599bd8SSage Weil 	if (took_snap_rwsem)
1639a8599bd8SSage Weil 		up_read(&mdsc->snap_rwsem);
1640a8599bd8SSage Weil }
1641a8599bd8SSage Weil 
1642a8599bd8SSage Weil /*
1643a8599bd8SSage Weil  * Try to flush dirty caps back to the auth mds.
1644a8599bd8SSage Weil  */
1645a8599bd8SSage Weil static int try_flush_caps(struct inode *inode, struct ceph_mds_session *session,
1646a8599bd8SSage Weil 			  unsigned *flush_tid)
1647a8599bd8SSage Weil {
1648a8599bd8SSage Weil 	struct ceph_mds_client *mdsc = &ceph_client(inode->i_sb)->mdsc;
1649a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
1650a8599bd8SSage Weil 	int unlock_session = session ? 0 : 1;
1651a8599bd8SSage Weil 	int flushing = 0;
1652a8599bd8SSage Weil 
1653a8599bd8SSage Weil retry:
1654a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
1655a8599bd8SSage Weil 	if (ci->i_dirty_caps && ci->i_auth_cap) {
1656a8599bd8SSage Weil 		struct ceph_cap *cap = ci->i_auth_cap;
1657a8599bd8SSage Weil 		int used = __ceph_caps_used(ci);
1658a8599bd8SSage Weil 		int want = __ceph_caps_wanted(ci);
1659a8599bd8SSage Weil 		int delayed;
1660a8599bd8SSage Weil 
1661a8599bd8SSage Weil 		if (!session) {
1662a8599bd8SSage Weil 			spin_unlock(&inode->i_lock);
1663a8599bd8SSage Weil 			session = cap->session;
1664a8599bd8SSage Weil 			mutex_lock(&session->s_mutex);
1665a8599bd8SSage Weil 			goto retry;
1666a8599bd8SSage Weil 		}
1667a8599bd8SSage Weil 		BUG_ON(session != cap->session);
1668a8599bd8SSage Weil 		if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
1669a8599bd8SSage Weil 			goto out;
1670a8599bd8SSage Weil 
1671cdc35f96SSage Weil 		flushing = __mark_caps_flushing(inode, session);
1672a8599bd8SSage Weil 
1673a8599bd8SSage Weil 		/* __send_cap drops i_lock */
1674a8599bd8SSage Weil 		delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
1675a8599bd8SSage Weil 				     cap->issued | cap->implemented, flushing,
1676a8599bd8SSage Weil 				     flush_tid);
1677a8599bd8SSage Weil 		if (!delayed)
1678a8599bd8SSage Weil 			goto out_unlocked;
1679a8599bd8SSage Weil 
1680a8599bd8SSage Weil 		spin_lock(&inode->i_lock);
1681a8599bd8SSage Weil 		__cap_delay_requeue(mdsc, ci);
1682a8599bd8SSage Weil 	}
1683a8599bd8SSage Weil out:
1684a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
1685a8599bd8SSage Weil out_unlocked:
1686a8599bd8SSage Weil 	if (session && unlock_session)
1687a8599bd8SSage Weil 		mutex_unlock(&session->s_mutex);
1688a8599bd8SSage Weil 	return flushing;
1689a8599bd8SSage Weil }
1690a8599bd8SSage Weil 
1691a8599bd8SSage Weil /*
1692a8599bd8SSage Weil  * Return true if we've flushed caps through the given flush_tid.
1693a8599bd8SSage Weil  */
1694a8599bd8SSage Weil static int caps_are_flushed(struct inode *inode, unsigned tid)
1695a8599bd8SSage Weil {
1696a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
1697a8599bd8SSage Weil 	int dirty, i, ret = 1;
1698a8599bd8SSage Weil 
1699a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
1700a8599bd8SSage Weil 	dirty = __ceph_caps_dirty(ci);
1701a8599bd8SSage Weil 	for (i = 0; i < CEPH_CAP_BITS; i++)
1702a8599bd8SSage Weil 		if ((ci->i_flushing_caps & (1 << i)) &&
1703a8599bd8SSage Weil 		    ci->i_cap_flush_tid[i] <= tid) {
1704a8599bd8SSage Weil 			/* still flushing this bit */
1705a8599bd8SSage Weil 			ret = 0;
1706a8599bd8SSage Weil 			break;
1707a8599bd8SSage Weil 		}
1708a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
1709a8599bd8SSage Weil 	return ret;
1710a8599bd8SSage Weil }
1711a8599bd8SSage Weil 
1712a8599bd8SSage Weil /*
1713a8599bd8SSage Weil  * Wait on any unsafe replies for the given inode.  First wait on the
1714a8599bd8SSage Weil  * newest request, and make that the upper bound.  Then, if there are
1715a8599bd8SSage Weil  * more requests, keep waiting on the oldest as long as it is still older
1716a8599bd8SSage Weil  * than the original request.
1717a8599bd8SSage Weil  */
1718a8599bd8SSage Weil static void sync_write_wait(struct inode *inode)
1719a8599bd8SSage Weil {
1720a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
1721a8599bd8SSage Weil 	struct list_head *head = &ci->i_unsafe_writes;
1722a8599bd8SSage Weil 	struct ceph_osd_request *req;
1723a8599bd8SSage Weil 	u64 last_tid;
1724a8599bd8SSage Weil 
1725a8599bd8SSage Weil 	spin_lock(&ci->i_unsafe_lock);
1726a8599bd8SSage Weil 	if (list_empty(head))
1727a8599bd8SSage Weil 		goto out;
1728a8599bd8SSage Weil 
1729a8599bd8SSage Weil 	/* set upper bound as _last_ entry in chain */
1730a8599bd8SSage Weil 	req = list_entry(head->prev, struct ceph_osd_request,
1731a8599bd8SSage Weil 			 r_unsafe_item);
1732a8599bd8SSage Weil 	last_tid = req->r_tid;
1733a8599bd8SSage Weil 
1734a8599bd8SSage Weil 	do {
1735a8599bd8SSage Weil 		ceph_osdc_get_request(req);
1736a8599bd8SSage Weil 		spin_unlock(&ci->i_unsafe_lock);
1737a8599bd8SSage Weil 		dout("sync_write_wait on tid %llu (until %llu)\n",
1738a8599bd8SSage Weil 		     req->r_tid, last_tid);
1739a8599bd8SSage Weil 		wait_for_completion(&req->r_safe_completion);
1740a8599bd8SSage Weil 		spin_lock(&ci->i_unsafe_lock);
1741a8599bd8SSage Weil 		ceph_osdc_put_request(req);
1742a8599bd8SSage Weil 
1743a8599bd8SSage Weil 		/*
1744a8599bd8SSage Weil 		 * from here on look at first entry in chain, since we
1745a8599bd8SSage Weil 		 * only want to wait for anything older than last_tid
1746a8599bd8SSage Weil 		 */
1747a8599bd8SSage Weil 		if (list_empty(head))
1748a8599bd8SSage Weil 			break;
1749a8599bd8SSage Weil 		req = list_entry(head->next, struct ceph_osd_request,
1750a8599bd8SSage Weil 				 r_unsafe_item);
1751a8599bd8SSage Weil 	} while (req->r_tid < last_tid);
1752a8599bd8SSage Weil out:
1753a8599bd8SSage Weil 	spin_unlock(&ci->i_unsafe_lock);
1754a8599bd8SSage Weil }
1755a8599bd8SSage Weil 
1756a8599bd8SSage Weil int ceph_fsync(struct file *file, struct dentry *dentry, int datasync)
1757a8599bd8SSage Weil {
1758a8599bd8SSage Weil 	struct inode *inode = dentry->d_inode;
1759a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
1760a8599bd8SSage Weil 	unsigned flush_tid;
1761a8599bd8SSage Weil 	int ret;
1762a8599bd8SSage Weil 	int dirty;
1763a8599bd8SSage Weil 
1764a8599bd8SSage Weil 	dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
1765a8599bd8SSage Weil 	sync_write_wait(inode);
1766a8599bd8SSage Weil 
1767a8599bd8SSage Weil 	ret = filemap_write_and_wait(inode->i_mapping);
1768a8599bd8SSage Weil 	if (ret < 0)
1769a8599bd8SSage Weil 		return ret;
1770a8599bd8SSage Weil 
1771a8599bd8SSage Weil 	dirty = try_flush_caps(inode, NULL, &flush_tid);
1772a8599bd8SSage Weil 	dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
1773a8599bd8SSage Weil 
1774a8599bd8SSage Weil 	/*
1775a8599bd8SSage Weil 	 * only wait on non-file metadata writeback (the mds
1776a8599bd8SSage Weil 	 * can recover size and mtime, so we don't need to
1777a8599bd8SSage Weil 	 * wait for that)
1778a8599bd8SSage Weil 	 */
1779a8599bd8SSage Weil 	if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
1780a8599bd8SSage Weil 		dout("fsync waiting for flush_tid %u\n", flush_tid);
1781a8599bd8SSage Weil 		ret = wait_event_interruptible(ci->i_cap_wq,
1782a8599bd8SSage Weil 				       caps_are_flushed(inode, flush_tid));
1783a8599bd8SSage Weil 	}
1784a8599bd8SSage Weil 
1785a8599bd8SSage Weil 	dout("fsync %p%s done\n", inode, datasync ? " datasync" : "");
1786a8599bd8SSage Weil 	return ret;
1787a8599bd8SSage Weil }
1788a8599bd8SSage Weil 
1789a8599bd8SSage Weil /*
1790a8599bd8SSage Weil  * Flush any dirty caps back to the mds.  If we aren't asked to wait,
1791a8599bd8SSage Weil  * queue inode for flush but don't do so immediately, because we can
1792a8599bd8SSage Weil  * get by with fewer MDS messages if we wait for data writeback to
1793a8599bd8SSage Weil  * complete first.
1794a8599bd8SSage Weil  */
1795a8599bd8SSage Weil int ceph_write_inode(struct inode *inode, int wait)
1796a8599bd8SSage Weil {
1797a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
1798a8599bd8SSage Weil 	unsigned flush_tid;
1799a8599bd8SSage Weil 	int err = 0;
1800a8599bd8SSage Weil 	int dirty;
1801a8599bd8SSage Weil 
1802a8599bd8SSage Weil 	dout("write_inode %p wait=%d\n", inode, wait);
1803a8599bd8SSage Weil 	if (wait) {
1804a8599bd8SSage Weil 		dirty = try_flush_caps(inode, NULL, &flush_tid);
1805a8599bd8SSage Weil 		if (dirty)
1806a8599bd8SSage Weil 			err = wait_event_interruptible(ci->i_cap_wq,
1807a8599bd8SSage Weil 				       caps_are_flushed(inode, flush_tid));
1808a8599bd8SSage Weil 	} else {
1809a8599bd8SSage Weil 		struct ceph_mds_client *mdsc = &ceph_client(inode->i_sb)->mdsc;
1810a8599bd8SSage Weil 
1811a8599bd8SSage Weil 		spin_lock(&inode->i_lock);
1812a8599bd8SSage Weil 		if (__ceph_caps_dirty(ci))
1813a8599bd8SSage Weil 			__cap_delay_requeue_front(mdsc, ci);
1814a8599bd8SSage Weil 		spin_unlock(&inode->i_lock);
1815a8599bd8SSage Weil 	}
1816a8599bd8SSage Weil 	return err;
1817a8599bd8SSage Weil }
1818a8599bd8SSage Weil 
1819a8599bd8SSage Weil /*
1820a8599bd8SSage Weil  * After a recovering MDS goes active, we need to resend any caps
1821a8599bd8SSage Weil  * we were flushing.
1822a8599bd8SSage Weil  *
1823a8599bd8SSage Weil  * Caller holds session->s_mutex.
1824a8599bd8SSage Weil  */
1825a8599bd8SSage Weil static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc,
1826a8599bd8SSage Weil 				   struct ceph_mds_session *session)
1827a8599bd8SSage Weil {
1828a8599bd8SSage Weil 	struct ceph_cap_snap *capsnap;
1829a8599bd8SSage Weil 
1830a8599bd8SSage Weil 	dout("kick_flushing_capsnaps mds%d\n", session->s_mds);
1831a8599bd8SSage Weil 	list_for_each_entry(capsnap, &session->s_cap_snaps_flushing,
1832a8599bd8SSage Weil 			    flushing_item) {
1833a8599bd8SSage Weil 		struct ceph_inode_info *ci = capsnap->ci;
1834a8599bd8SSage Weil 		struct inode *inode = &ci->vfs_inode;
1835a8599bd8SSage Weil 		struct ceph_cap *cap;
1836a8599bd8SSage Weil 
1837a8599bd8SSage Weil 		spin_lock(&inode->i_lock);
1838a8599bd8SSage Weil 		cap = ci->i_auth_cap;
1839a8599bd8SSage Weil 		if (cap && cap->session == session) {
1840a8599bd8SSage Weil 			dout("kick_flushing_caps %p cap %p capsnap %p\n", inode,
1841a8599bd8SSage Weil 			     cap, capsnap);
1842a8599bd8SSage Weil 			__ceph_flush_snaps(ci, &session);
1843a8599bd8SSage Weil 		} else {
1844a8599bd8SSage Weil 			pr_err("%p auth cap %p not mds%d ???\n", inode,
1845a8599bd8SSage Weil 			       cap, session->s_mds);
1846a8599bd8SSage Weil 			spin_unlock(&inode->i_lock);
1847a8599bd8SSage Weil 		}
1848a8599bd8SSage Weil 	}
1849a8599bd8SSage Weil }
1850a8599bd8SSage Weil 
1851a8599bd8SSage Weil void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
1852a8599bd8SSage Weil 			     struct ceph_mds_session *session)
1853a8599bd8SSage Weil {
1854a8599bd8SSage Weil 	struct ceph_inode_info *ci;
1855a8599bd8SSage Weil 
1856a8599bd8SSage Weil 	kick_flushing_capsnaps(mdsc, session);
1857a8599bd8SSage Weil 
1858a8599bd8SSage Weil 	dout("kick_flushing_caps mds%d\n", session->s_mds);
1859a8599bd8SSage Weil 	list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
1860a8599bd8SSage Weil 		struct inode *inode = &ci->vfs_inode;
1861a8599bd8SSage Weil 		struct ceph_cap *cap;
1862a8599bd8SSage Weil 		int delayed = 0;
1863a8599bd8SSage Weil 
1864a8599bd8SSage Weil 		spin_lock(&inode->i_lock);
1865a8599bd8SSage Weil 		cap = ci->i_auth_cap;
1866a8599bd8SSage Weil 		if (cap && cap->session == session) {
1867a8599bd8SSage Weil 			dout("kick_flushing_caps %p cap %p %s\n", inode,
1868a8599bd8SSage Weil 			     cap, ceph_cap_string(ci->i_flushing_caps));
1869a8599bd8SSage Weil 			delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1870a8599bd8SSage Weil 					     __ceph_caps_used(ci),
1871a8599bd8SSage Weil 					     __ceph_caps_wanted(ci),
1872a8599bd8SSage Weil 					     cap->issued | cap->implemented,
1873a8599bd8SSage Weil 					     ci->i_flushing_caps, NULL);
1874a8599bd8SSage Weil 			if (delayed) {
1875a8599bd8SSage Weil 				spin_lock(&inode->i_lock);
1876a8599bd8SSage Weil 				__cap_delay_requeue(mdsc, ci);
1877a8599bd8SSage Weil 				spin_unlock(&inode->i_lock);
1878a8599bd8SSage Weil 			}
1879a8599bd8SSage Weil 		} else {
1880a8599bd8SSage Weil 			pr_err("%p auth cap %p not mds%d ???\n", inode,
1881a8599bd8SSage Weil 			       cap, session->s_mds);
1882a8599bd8SSage Weil 			spin_unlock(&inode->i_lock);
1883a8599bd8SSage Weil 		}
1884a8599bd8SSage Weil 	}
1885a8599bd8SSage Weil }
1886a8599bd8SSage Weil 
1887a8599bd8SSage Weil 
1888a8599bd8SSage Weil /*
1889a8599bd8SSage Weil  * Take references to capabilities we hold, so that we don't release
1890a8599bd8SSage Weil  * them to the MDS prematurely.
1891a8599bd8SSage Weil  *
1892a8599bd8SSage Weil  * Protected by i_lock.
1893a8599bd8SSage Weil  */
1894a8599bd8SSage Weil static void __take_cap_refs(struct ceph_inode_info *ci, int got)
1895a8599bd8SSage Weil {
1896a8599bd8SSage Weil 	if (got & CEPH_CAP_PIN)
1897a8599bd8SSage Weil 		ci->i_pin_ref++;
1898a8599bd8SSage Weil 	if (got & CEPH_CAP_FILE_RD)
1899a8599bd8SSage Weil 		ci->i_rd_ref++;
1900a8599bd8SSage Weil 	if (got & CEPH_CAP_FILE_CACHE)
1901a8599bd8SSage Weil 		ci->i_rdcache_ref++;
1902a8599bd8SSage Weil 	if (got & CEPH_CAP_FILE_WR)
1903a8599bd8SSage Weil 		ci->i_wr_ref++;
1904a8599bd8SSage Weil 	if (got & CEPH_CAP_FILE_BUFFER) {
1905a8599bd8SSage Weil 		if (ci->i_wrbuffer_ref == 0)
1906a8599bd8SSage Weil 			igrab(&ci->vfs_inode);
1907a8599bd8SSage Weil 		ci->i_wrbuffer_ref++;
1908a8599bd8SSage Weil 		dout("__take_cap_refs %p wrbuffer %d -> %d (?)\n",
1909a8599bd8SSage Weil 		     &ci->vfs_inode, ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref);
1910a8599bd8SSage Weil 	}
1911a8599bd8SSage Weil }
1912a8599bd8SSage Weil 
1913a8599bd8SSage Weil /*
1914a8599bd8SSage Weil  * Try to grab cap references.  Specify those refs we @want, and the
1915a8599bd8SSage Weil  * minimal set we @need.  Also include the larger offset we are writing
1916a8599bd8SSage Weil  * to (when applicable), and check against max_size here as well.
1917a8599bd8SSage Weil  * Note that caller is responsible for ensuring max_size increases are
1918a8599bd8SSage Weil  * requested from the MDS.
1919a8599bd8SSage Weil  */
1920a8599bd8SSage Weil static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
1921a8599bd8SSage Weil 			    int *got, loff_t endoff, int *check_max, int *err)
1922a8599bd8SSage Weil {
1923a8599bd8SSage Weil 	struct inode *inode = &ci->vfs_inode;
1924a8599bd8SSage Weil 	int ret = 0;
1925a8599bd8SSage Weil 	int have, implemented;
1926a8599bd8SSage Weil 
1927a8599bd8SSage Weil 	dout("get_cap_refs %p need %s want %s\n", inode,
1928a8599bd8SSage Weil 	     ceph_cap_string(need), ceph_cap_string(want));
1929a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
1930a8599bd8SSage Weil 
1931a8599bd8SSage Weil 	/* make sure we _have_ some caps! */
1932a8599bd8SSage Weil 	if (!__ceph_is_any_caps(ci)) {
1933a8599bd8SSage Weil 		dout("get_cap_refs %p no real caps\n", inode);
1934a8599bd8SSage Weil 		*err = -EBADF;
1935a8599bd8SSage Weil 		ret = 1;
1936a8599bd8SSage Weil 		goto out;
1937a8599bd8SSage Weil 	}
1938a8599bd8SSage Weil 
1939a8599bd8SSage Weil 	if (need & CEPH_CAP_FILE_WR) {
1940a8599bd8SSage Weil 		if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
1941a8599bd8SSage Weil 			dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
1942a8599bd8SSage Weil 			     inode, endoff, ci->i_max_size);
1943a8599bd8SSage Weil 			if (endoff > ci->i_wanted_max_size) {
1944a8599bd8SSage Weil 				*check_max = 1;
1945a8599bd8SSage Weil 				ret = 1;
1946a8599bd8SSage Weil 			}
1947a8599bd8SSage Weil 			goto out;
1948a8599bd8SSage Weil 		}
1949a8599bd8SSage Weil 		/*
1950a8599bd8SSage Weil 		 * If a sync write is in progress, we must wait, so that we
1951a8599bd8SSage Weil 		 * can get a final snapshot value for size+mtime.
1952a8599bd8SSage Weil 		 */
1953a8599bd8SSage Weil 		if (__ceph_have_pending_cap_snap(ci)) {
1954a8599bd8SSage Weil 			dout("get_cap_refs %p cap_snap_pending\n", inode);
1955a8599bd8SSage Weil 			goto out;
1956a8599bd8SSage Weil 		}
1957a8599bd8SSage Weil 	}
1958a8599bd8SSage Weil 	have = __ceph_caps_issued(ci, &implemented);
1959a8599bd8SSage Weil 
1960a8599bd8SSage Weil 	/*
1961a8599bd8SSage Weil 	 * disallow writes while a truncate is pending
1962a8599bd8SSage Weil 	 */
1963a8599bd8SSage Weil 	if (ci->i_truncate_pending)
1964a8599bd8SSage Weil 		have &= ~CEPH_CAP_FILE_WR;
1965a8599bd8SSage Weil 
1966a8599bd8SSage Weil 	if ((have & need) == need) {
1967a8599bd8SSage Weil 		/*
1968a8599bd8SSage Weil 		 * Look at (implemented & ~have & not) so that we keep waiting
1969a8599bd8SSage Weil 		 * on transition from wanted -> needed caps.  This is needed
1970a8599bd8SSage Weil 		 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
1971a8599bd8SSage Weil 		 * going before a prior buffered writeback happens.
1972a8599bd8SSage Weil 		 */
1973a8599bd8SSage Weil 		int not = want & ~(have & need);
1974a8599bd8SSage Weil 		int revoking = implemented & ~have;
1975a8599bd8SSage Weil 		dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
1976a8599bd8SSage Weil 		     inode, ceph_cap_string(have), ceph_cap_string(not),
1977a8599bd8SSage Weil 		     ceph_cap_string(revoking));
1978a8599bd8SSage Weil 		if ((revoking & not) == 0) {
1979a8599bd8SSage Weil 			*got = need | (have & want);
1980a8599bd8SSage Weil 			__take_cap_refs(ci, *got);
1981a8599bd8SSage Weil 			ret = 1;
1982a8599bd8SSage Weil 		}
1983a8599bd8SSage Weil 	} else {
1984a8599bd8SSage Weil 		dout("get_cap_refs %p have %s needed %s\n", inode,
1985a8599bd8SSage Weil 		     ceph_cap_string(have), ceph_cap_string(need));
1986a8599bd8SSage Weil 	}
1987a8599bd8SSage Weil out:
1988a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
1989a8599bd8SSage Weil 	dout("get_cap_refs %p ret %d got %s\n", inode,
1990a8599bd8SSage Weil 	     ret, ceph_cap_string(*got));
1991a8599bd8SSage Weil 	return ret;
1992a8599bd8SSage Weil }
1993a8599bd8SSage Weil 
1994a8599bd8SSage Weil /*
1995a8599bd8SSage Weil  * Check the offset we are writing up to against our current
1996a8599bd8SSage Weil  * max_size.  If necessary, tell the MDS we want to write to
1997a8599bd8SSage Weil  * a larger offset.
1998a8599bd8SSage Weil  */
1999a8599bd8SSage Weil static void check_max_size(struct inode *inode, loff_t endoff)
2000a8599bd8SSage Weil {
2001a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
2002a8599bd8SSage Weil 	int check = 0;
2003a8599bd8SSage Weil 
2004a8599bd8SSage Weil 	/* do we need to explicitly request a larger max_size? */
2005a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
2006a8599bd8SSage Weil 	if ((endoff >= ci->i_max_size ||
2007a8599bd8SSage Weil 	     endoff > (inode->i_size << 1)) &&
2008a8599bd8SSage Weil 	    endoff > ci->i_wanted_max_size) {
2009a8599bd8SSage Weil 		dout("write %p at large endoff %llu, req max_size\n",
2010a8599bd8SSage Weil 		     inode, endoff);
2011a8599bd8SSage Weil 		ci->i_wanted_max_size = endoff;
2012a8599bd8SSage Weil 		check = 1;
2013a8599bd8SSage Weil 	}
2014a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
2015a8599bd8SSage Weil 	if (check)
2016a8599bd8SSage Weil 		ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2017a8599bd8SSage Weil }
2018a8599bd8SSage Weil 
2019a8599bd8SSage Weil /*
2020a8599bd8SSage Weil  * Wait for caps, and take cap references.  If we can't get a WR cap
2021a8599bd8SSage Weil  * due to a small max_size, make sure we check_max_size (and possibly
2022a8599bd8SSage Weil  * ask the mds) so we don't get hung up indefinitely.
2023a8599bd8SSage Weil  */
2024a8599bd8SSage Weil int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got,
2025a8599bd8SSage Weil 		  loff_t endoff)
2026a8599bd8SSage Weil {
2027a8599bd8SSage Weil 	int check_max, ret, err;
2028a8599bd8SSage Weil 
2029a8599bd8SSage Weil retry:
2030a8599bd8SSage Weil 	if (endoff > 0)
2031a8599bd8SSage Weil 		check_max_size(&ci->vfs_inode, endoff);
2032a8599bd8SSage Weil 	check_max = 0;
2033a8599bd8SSage Weil 	err = 0;
2034a8599bd8SSage Weil 	ret = wait_event_interruptible(ci->i_cap_wq,
2035a8599bd8SSage Weil 				       try_get_cap_refs(ci, need, want,
2036a8599bd8SSage Weil 							got, endoff,
2037a8599bd8SSage Weil 							&check_max, &err));
2038a8599bd8SSage Weil 	if (err)
2039a8599bd8SSage Weil 		ret = err;
2040a8599bd8SSage Weil 	if (check_max)
2041a8599bd8SSage Weil 		goto retry;
2042a8599bd8SSage Weil 	return ret;
2043a8599bd8SSage Weil }
2044a8599bd8SSage Weil 
2045a8599bd8SSage Weil /*
2046a8599bd8SSage Weil  * Take cap refs.  Caller must already know we hold at least one ref
2047a8599bd8SSage Weil  * on the caps in question or we don't know this is safe.
2048a8599bd8SSage Weil  */
2049a8599bd8SSage Weil void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2050a8599bd8SSage Weil {
2051a8599bd8SSage Weil 	spin_lock(&ci->vfs_inode.i_lock);
2052a8599bd8SSage Weil 	__take_cap_refs(ci, caps);
2053a8599bd8SSage Weil 	spin_unlock(&ci->vfs_inode.i_lock);
2054a8599bd8SSage Weil }
2055a8599bd8SSage Weil 
2056a8599bd8SSage Weil /*
2057a8599bd8SSage Weil  * Release cap refs.
2058a8599bd8SSage Weil  *
2059a8599bd8SSage Weil  * If we released the last ref on any given cap, call ceph_check_caps
2060a8599bd8SSage Weil  * to release (or schedule a release).
2061a8599bd8SSage Weil  *
2062a8599bd8SSage Weil  * If we are releasing a WR cap (from a sync write), finalize any affected
2063a8599bd8SSage Weil  * cap_snap, and wake up any waiters.
2064a8599bd8SSage Weil  */
2065a8599bd8SSage Weil void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
2066a8599bd8SSage Weil {
2067a8599bd8SSage Weil 	struct inode *inode = &ci->vfs_inode;
2068a8599bd8SSage Weil 	int last = 0, put = 0, flushsnaps = 0, wake = 0;
2069a8599bd8SSage Weil 	struct ceph_cap_snap *capsnap;
2070a8599bd8SSage Weil 
2071a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
2072a8599bd8SSage Weil 	if (had & CEPH_CAP_PIN)
2073a8599bd8SSage Weil 		--ci->i_pin_ref;
2074a8599bd8SSage Weil 	if (had & CEPH_CAP_FILE_RD)
2075a8599bd8SSage Weil 		if (--ci->i_rd_ref == 0)
2076a8599bd8SSage Weil 			last++;
2077a8599bd8SSage Weil 	if (had & CEPH_CAP_FILE_CACHE)
2078a8599bd8SSage Weil 		if (--ci->i_rdcache_ref == 0)
2079a8599bd8SSage Weil 			last++;
2080a8599bd8SSage Weil 	if (had & CEPH_CAP_FILE_BUFFER) {
2081a8599bd8SSage Weil 		if (--ci->i_wrbuffer_ref == 0) {
2082a8599bd8SSage Weil 			last++;
2083a8599bd8SSage Weil 			put++;
2084a8599bd8SSage Weil 		}
2085a8599bd8SSage Weil 		dout("put_cap_refs %p wrbuffer %d -> %d (?)\n",
2086a8599bd8SSage Weil 		     inode, ci->i_wrbuffer_ref+1, ci->i_wrbuffer_ref);
2087a8599bd8SSage Weil 	}
2088a8599bd8SSage Weil 	if (had & CEPH_CAP_FILE_WR)
2089a8599bd8SSage Weil 		if (--ci->i_wr_ref == 0) {
2090a8599bd8SSage Weil 			last++;
2091a8599bd8SSage Weil 			if (!list_empty(&ci->i_cap_snaps)) {
2092a8599bd8SSage Weil 				capsnap = list_first_entry(&ci->i_cap_snaps,
2093a8599bd8SSage Weil 						     struct ceph_cap_snap,
2094a8599bd8SSage Weil 						     ci_item);
2095a8599bd8SSage Weil 				if (capsnap->writing) {
2096a8599bd8SSage Weil 					capsnap->writing = 0;
2097a8599bd8SSage Weil 					flushsnaps =
2098a8599bd8SSage Weil 						__ceph_finish_cap_snap(ci,
2099a8599bd8SSage Weil 								       capsnap);
2100a8599bd8SSage Weil 					wake = 1;
2101a8599bd8SSage Weil 				}
2102a8599bd8SSage Weil 			}
2103a8599bd8SSage Weil 		}
2104a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
2105a8599bd8SSage Weil 
2106a8599bd8SSage Weil 	dout("put_cap_refs %p had %s %s\n", inode, ceph_cap_string(had),
2107a8599bd8SSage Weil 	     last ? "last" : "");
2108a8599bd8SSage Weil 
2109a8599bd8SSage Weil 	if (last && !flushsnaps)
2110a8599bd8SSage Weil 		ceph_check_caps(ci, 0, NULL);
2111a8599bd8SSage Weil 	else if (flushsnaps)
2112a8599bd8SSage Weil 		ceph_flush_snaps(ci);
2113a8599bd8SSage Weil 	if (wake)
2114a8599bd8SSage Weil 		wake_up(&ci->i_cap_wq);
2115a8599bd8SSage Weil 	if (put)
2116a8599bd8SSage Weil 		iput(inode);
2117a8599bd8SSage Weil }
2118a8599bd8SSage Weil 
2119a8599bd8SSage Weil /*
2120a8599bd8SSage Weil  * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2121a8599bd8SSage Weil  * context.  Adjust per-snap dirty page accounting as appropriate.
2122a8599bd8SSage Weil  * Once all dirty data for a cap_snap is flushed, flush snapped file
2123a8599bd8SSage Weil  * metadata back to the MDS.  If we dropped the last ref, call
2124a8599bd8SSage Weil  * ceph_check_caps.
2125a8599bd8SSage Weil  */
2126a8599bd8SSage Weil void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
2127a8599bd8SSage Weil 				struct ceph_snap_context *snapc)
2128a8599bd8SSage Weil {
2129a8599bd8SSage Weil 	struct inode *inode = &ci->vfs_inode;
2130a8599bd8SSage Weil 	int last = 0;
2131a8599bd8SSage Weil 	int last_snap = 0;
2132a8599bd8SSage Weil 	int found = 0;
2133a8599bd8SSage Weil 	struct ceph_cap_snap *capsnap = NULL;
2134a8599bd8SSage Weil 
2135a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
2136a8599bd8SSage Weil 	ci->i_wrbuffer_ref -= nr;
2137a8599bd8SSage Weil 	last = !ci->i_wrbuffer_ref;
2138a8599bd8SSage Weil 
2139a8599bd8SSage Weil 	if (ci->i_head_snapc == snapc) {
2140a8599bd8SSage Weil 		ci->i_wrbuffer_ref_head -= nr;
2141a8599bd8SSage Weil 		if (!ci->i_wrbuffer_ref_head) {
2142a8599bd8SSage Weil 			ceph_put_snap_context(ci->i_head_snapc);
2143a8599bd8SSage Weil 			ci->i_head_snapc = NULL;
2144a8599bd8SSage Weil 		}
2145a8599bd8SSage Weil 		dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2146a8599bd8SSage Weil 		     inode,
2147a8599bd8SSage Weil 		     ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
2148a8599bd8SSage Weil 		     ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
2149a8599bd8SSage Weil 		     last ? " LAST" : "");
2150a8599bd8SSage Weil 	} else {
2151a8599bd8SSage Weil 		list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2152a8599bd8SSage Weil 			if (capsnap->context == snapc) {
2153a8599bd8SSage Weil 				found = 1;
2154a8599bd8SSage Weil 				capsnap->dirty_pages -= nr;
2155a8599bd8SSage Weil 				last_snap = !capsnap->dirty_pages;
2156a8599bd8SSage Weil 				break;
2157a8599bd8SSage Weil 			}
2158a8599bd8SSage Weil 		}
2159a8599bd8SSage Weil 		BUG_ON(!found);
2160a8599bd8SSage Weil 		dout("put_wrbuffer_cap_refs on %p cap_snap %p "
2161a8599bd8SSage Weil 		     " snap %lld %d/%d -> %d/%d %s%s\n",
2162a8599bd8SSage Weil 		     inode, capsnap, capsnap->context->seq,
2163a8599bd8SSage Weil 		     ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
2164a8599bd8SSage Weil 		     ci->i_wrbuffer_ref, capsnap->dirty_pages,
2165a8599bd8SSage Weil 		     last ? " (wrbuffer last)" : "",
2166a8599bd8SSage Weil 		     last_snap ? " (capsnap last)" : "");
2167a8599bd8SSage Weil 	}
2168a8599bd8SSage Weil 
2169a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
2170a8599bd8SSage Weil 
2171a8599bd8SSage Weil 	if (last) {
2172a8599bd8SSage Weil 		ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2173a8599bd8SSage Weil 		iput(inode);
2174a8599bd8SSage Weil 	} else if (last_snap) {
2175a8599bd8SSage Weil 		ceph_flush_snaps(ci);
2176a8599bd8SSage Weil 		wake_up(&ci->i_cap_wq);
2177a8599bd8SSage Weil 	}
2178a8599bd8SSage Weil }
2179a8599bd8SSage Weil 
2180a8599bd8SSage Weil /*
2181a8599bd8SSage Weil  * Handle a cap GRANT message from the MDS.  (Note that a GRANT may
2182a8599bd8SSage Weil  * actually be a revocation if it specifies a smaller cap set.)
2183a8599bd8SSage Weil  *
2184a8599bd8SSage Weil  * caller holds s_mutex.
2185a8599bd8SSage Weil  * return value:
2186a8599bd8SSage Weil  *  0 - ok
2187a8599bd8SSage Weil  *  1 - check_caps on auth cap only (writeback)
2188a8599bd8SSage Weil  *  2 - check_caps (ack revoke)
2189a8599bd8SSage Weil  */
2190a8599bd8SSage Weil static int handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
2191a8599bd8SSage Weil 			    struct ceph_mds_session *session,
2192a8599bd8SSage Weil 			    struct ceph_cap *cap,
2193a8599bd8SSage Weil 			    struct ceph_buffer *xattr_buf)
2194a8599bd8SSage Weil 	__releases(inode->i_lock)
2195a8599bd8SSage Weil 
2196a8599bd8SSage Weil {
2197a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
2198a8599bd8SSage Weil 	int mds = session->s_mds;
2199a8599bd8SSage Weil 	int seq = le32_to_cpu(grant->seq);
2200a8599bd8SSage Weil 	int newcaps = le32_to_cpu(grant->caps);
2201a8599bd8SSage Weil 	int issued, implemented, used, wanted, dirty;
2202a8599bd8SSage Weil 	u64 size = le64_to_cpu(grant->size);
2203a8599bd8SSage Weil 	u64 max_size = le64_to_cpu(grant->max_size);
2204a8599bd8SSage Weil 	struct timespec mtime, atime, ctime;
2205a8599bd8SSage Weil 	int reply = 0;
2206a8599bd8SSage Weil 	int wake = 0;
2207a8599bd8SSage Weil 	int writeback = 0;
2208a8599bd8SSage Weil 	int revoked_rdcache = 0;
22093c6f6b79SSage Weil 	int queue_invalidate = 0;
2210a8599bd8SSage Weil 
2211a8599bd8SSage Weil 	dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
2212a8599bd8SSage Weil 	     inode, cap, mds, seq, ceph_cap_string(newcaps));
2213a8599bd8SSage Weil 	dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
2214a8599bd8SSage Weil 		inode->i_size);
2215a8599bd8SSage Weil 
2216a8599bd8SSage Weil 	/*
2217a8599bd8SSage Weil 	 * If CACHE is being revoked, and we have no dirty buffers,
2218a8599bd8SSage Weil 	 * try to invalidate (once).  (If there are dirty buffers, we
2219a8599bd8SSage Weil 	 * will invalidate _after_ writeback.)
2220a8599bd8SSage Weil 	 */
2221a8599bd8SSage Weil 	if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
2222bcd2cbd1SYehuda Sadeh 	    !ci->i_wrbuffer_ref) {
22235ecad6fdSSage Weil 		if (try_nonblocking_invalidate(inode) == 0) {
22245ecad6fdSSage Weil 			revoked_rdcache = 1;
22255ecad6fdSSage Weil 		} else {
2226a8599bd8SSage Weil 			/* there were locked pages.. invalidate later
2227a8599bd8SSage Weil 			   in a separate thread. */
2228a8599bd8SSage Weil 			if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
22293c6f6b79SSage Weil 				queue_invalidate = 1;
2230a8599bd8SSage Weil 				ci->i_rdcache_revoking = ci->i_rdcache_gen;
2231a8599bd8SSage Weil 			}
2232a8599bd8SSage Weil 		}
2233a8599bd8SSage Weil 	}
2234a8599bd8SSage Weil 
2235a8599bd8SSage Weil 	/* side effects now are allowed */
2236a8599bd8SSage Weil 
2237a8599bd8SSage Weil 	issued = __ceph_caps_issued(ci, &implemented);
2238a8599bd8SSage Weil 	issued |= implemented | __ceph_caps_dirty(ci);
2239a8599bd8SSage Weil 
2240685f9a5dSSage Weil 	cap->cap_gen = session->s_cap_gen;
2241a8599bd8SSage Weil 
2242a8599bd8SSage Weil 	__check_cap_issue(ci, cap, newcaps);
2243a8599bd8SSage Weil 
2244a8599bd8SSage Weil 	if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
2245a8599bd8SSage Weil 		inode->i_mode = le32_to_cpu(grant->mode);
2246a8599bd8SSage Weil 		inode->i_uid = le32_to_cpu(grant->uid);
2247a8599bd8SSage Weil 		inode->i_gid = le32_to_cpu(grant->gid);
2248a8599bd8SSage Weil 		dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
2249a8599bd8SSage Weil 		     inode->i_uid, inode->i_gid);
2250a8599bd8SSage Weil 	}
2251a8599bd8SSage Weil 
2252a8599bd8SSage Weil 	if ((issued & CEPH_CAP_LINK_EXCL) == 0)
2253a8599bd8SSage Weil 		inode->i_nlink = le32_to_cpu(grant->nlink);
2254a8599bd8SSage Weil 
2255a8599bd8SSage Weil 	if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
2256a8599bd8SSage Weil 		int len = le32_to_cpu(grant->xattr_len);
2257a8599bd8SSage Weil 		u64 version = le64_to_cpu(grant->xattr_version);
2258a8599bd8SSage Weil 
2259a8599bd8SSage Weil 		if (version > ci->i_xattrs.version) {
2260a8599bd8SSage Weil 			dout(" got new xattrs v%llu on %p len %d\n",
2261a8599bd8SSage Weil 			     version, inode, len);
2262a8599bd8SSage Weil 			if (ci->i_xattrs.blob)
2263a8599bd8SSage Weil 				ceph_buffer_put(ci->i_xattrs.blob);
2264a8599bd8SSage Weil 			ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
2265a8599bd8SSage Weil 			ci->i_xattrs.version = version;
2266a8599bd8SSage Weil 		}
2267a8599bd8SSage Weil 	}
2268a8599bd8SSage Weil 
2269a8599bd8SSage Weil 	/* size/ctime/mtime/atime? */
2270a8599bd8SSage Weil 	ceph_fill_file_size(inode, issued,
2271a8599bd8SSage Weil 			    le32_to_cpu(grant->truncate_seq),
2272a8599bd8SSage Weil 			    le64_to_cpu(grant->truncate_size), size);
2273a8599bd8SSage Weil 	ceph_decode_timespec(&mtime, &grant->mtime);
2274a8599bd8SSage Weil 	ceph_decode_timespec(&atime, &grant->atime);
2275a8599bd8SSage Weil 	ceph_decode_timespec(&ctime, &grant->ctime);
2276a8599bd8SSage Weil 	ceph_fill_file_time(inode, issued,
2277a8599bd8SSage Weil 			    le32_to_cpu(grant->time_warp_seq), &ctime, &mtime,
2278a8599bd8SSage Weil 			    &atime);
2279a8599bd8SSage Weil 
2280a8599bd8SSage Weil 	/* max size increase? */
2281a8599bd8SSage Weil 	if (max_size != ci->i_max_size) {
2282a8599bd8SSage Weil 		dout("max_size %lld -> %llu\n", ci->i_max_size, max_size);
2283a8599bd8SSage Weil 		ci->i_max_size = max_size;
2284a8599bd8SSage Weil 		if (max_size >= ci->i_wanted_max_size) {
2285a8599bd8SSage Weil 			ci->i_wanted_max_size = 0;  /* reset */
2286a8599bd8SSage Weil 			ci->i_requested_max_size = 0;
2287a8599bd8SSage Weil 		}
2288a8599bd8SSage Weil 		wake = 1;
2289a8599bd8SSage Weil 	}
2290a8599bd8SSage Weil 
2291a8599bd8SSage Weil 	/* check cap bits */
2292a8599bd8SSage Weil 	wanted = __ceph_caps_wanted(ci);
2293a8599bd8SSage Weil 	used = __ceph_caps_used(ci);
2294a8599bd8SSage Weil 	dirty = __ceph_caps_dirty(ci);
2295a8599bd8SSage Weil 	dout(" my wanted = %s, used = %s, dirty %s\n",
2296a8599bd8SSage Weil 	     ceph_cap_string(wanted),
2297a8599bd8SSage Weil 	     ceph_cap_string(used),
2298a8599bd8SSage Weil 	     ceph_cap_string(dirty));
2299a8599bd8SSage Weil 	if (wanted != le32_to_cpu(grant->wanted)) {
2300a8599bd8SSage Weil 		dout("mds wanted %s -> %s\n",
2301a8599bd8SSage Weil 		     ceph_cap_string(le32_to_cpu(grant->wanted)),
2302a8599bd8SSage Weil 		     ceph_cap_string(wanted));
2303a8599bd8SSage Weil 		grant->wanted = cpu_to_le32(wanted);
2304a8599bd8SSage Weil 	}
2305a8599bd8SSage Weil 
2306a8599bd8SSage Weil 	cap->seq = seq;
2307a8599bd8SSage Weil 
2308a8599bd8SSage Weil 	/* file layout may have changed */
2309a8599bd8SSage Weil 	ci->i_layout = grant->layout;
2310a8599bd8SSage Weil 
2311a8599bd8SSage Weil 	/* revocation, grant, or no-op? */
2312a8599bd8SSage Weil 	if (cap->issued & ~newcaps) {
2313a8599bd8SSage Weil 		dout("revocation: %s -> %s\n", ceph_cap_string(cap->issued),
2314a8599bd8SSage Weil 		     ceph_cap_string(newcaps));
2315a8599bd8SSage Weil 		if ((used & ~newcaps) & CEPH_CAP_FILE_BUFFER)
2316a8599bd8SSage Weil 			writeback = 1; /* will delay ack */
2317a8599bd8SSage Weil 		else if (dirty & ~newcaps)
2318a8599bd8SSage Weil 			reply = 1;     /* initiate writeback in check_caps */
2319a8599bd8SSage Weil 		else if (((used & ~newcaps) & CEPH_CAP_FILE_CACHE) == 0 ||
2320a8599bd8SSage Weil 			   revoked_rdcache)
2321a8599bd8SSage Weil 			reply = 2;     /* send revoke ack in check_caps */
2322a8599bd8SSage Weil 		cap->issued = newcaps;
2323a8599bd8SSage Weil 	} else if (cap->issued == newcaps) {
2324a8599bd8SSage Weil 		dout("caps unchanged: %s -> %s\n",
2325a8599bd8SSage Weil 		     ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
2326a8599bd8SSage Weil 	} else {
2327a8599bd8SSage Weil 		dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
2328a8599bd8SSage Weil 		     ceph_cap_string(newcaps));
2329a8599bd8SSage Weil 		cap->issued = newcaps;
2330a8599bd8SSage Weil 		cap->implemented |= newcaps; /* add bits only, to
2331a8599bd8SSage Weil 					      * avoid stepping on a
2332a8599bd8SSage Weil 					      * pending revocation */
2333a8599bd8SSage Weil 		wake = 1;
2334a8599bd8SSage Weil 	}
2335a8599bd8SSage Weil 
2336a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
23373c6f6b79SSage Weil 	if (writeback)
2338a8599bd8SSage Weil 		/*
2339a8599bd8SSage Weil 		 * queue inode for writeback: we can't actually call
2340a8599bd8SSage Weil 		 * filemap_write_and_wait, etc. from message handler
2341a8599bd8SSage Weil 		 * context.
2342a8599bd8SSage Weil 		 */
23433c6f6b79SSage Weil 		ceph_queue_writeback(inode);
23443c6f6b79SSage Weil 	if (queue_invalidate)
23453c6f6b79SSage Weil 		ceph_queue_invalidate(inode);
2346a8599bd8SSage Weil 	if (wake)
2347a8599bd8SSage Weil 		wake_up(&ci->i_cap_wq);
2348a8599bd8SSage Weil 	return reply;
2349a8599bd8SSage Weil }
2350a8599bd8SSage Weil 
2351a8599bd8SSage Weil /*
2352a8599bd8SSage Weil  * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
2353a8599bd8SSage Weil  * MDS has been safely committed.
2354a8599bd8SSage Weil  */
23556df058c0SSage Weil static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
2356a8599bd8SSage Weil 				 struct ceph_mds_caps *m,
2357a8599bd8SSage Weil 				 struct ceph_mds_session *session,
2358a8599bd8SSage Weil 				 struct ceph_cap *cap)
2359a8599bd8SSage Weil 	__releases(inode->i_lock)
2360a8599bd8SSage Weil {
2361a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
2362a8599bd8SSage Weil 	struct ceph_mds_client *mdsc = &ceph_client(inode->i_sb)->mdsc;
2363a8599bd8SSage Weil 	unsigned seq = le32_to_cpu(m->seq);
2364a8599bd8SSage Weil 	int dirty = le32_to_cpu(m->dirty);
2365a8599bd8SSage Weil 	int cleaned = 0;
2366afcdaea3SSage Weil 	int drop = 0;
2367a8599bd8SSage Weil 	int i;
2368a8599bd8SSage Weil 
2369a8599bd8SSage Weil 	for (i = 0; i < CEPH_CAP_BITS; i++)
2370a8599bd8SSage Weil 		if ((dirty & (1 << i)) &&
2371a8599bd8SSage Weil 		    flush_tid == ci->i_cap_flush_tid[i])
2372a8599bd8SSage Weil 			cleaned |= 1 << i;
2373a8599bd8SSage Weil 
2374a8599bd8SSage Weil 	dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
2375a8599bd8SSage Weil 	     " flushing %s -> %s\n",
2376a8599bd8SSage Weil 	     inode, session->s_mds, seq, ceph_cap_string(dirty),
2377a8599bd8SSage Weil 	     ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
2378a8599bd8SSage Weil 	     ceph_cap_string(ci->i_flushing_caps & ~cleaned));
2379a8599bd8SSage Weil 
2380a8599bd8SSage Weil 	if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned))
2381a8599bd8SSage Weil 		goto out;
2382a8599bd8SSage Weil 
2383a8599bd8SSage Weil 	ci->i_flushing_caps &= ~cleaned;
2384a8599bd8SSage Weil 
2385a8599bd8SSage Weil 	spin_lock(&mdsc->cap_dirty_lock);
2386a8599bd8SSage Weil 	if (ci->i_flushing_caps == 0) {
2387a8599bd8SSage Weil 		list_del_init(&ci->i_flushing_item);
2388a8599bd8SSage Weil 		if (!list_empty(&session->s_cap_flushing))
2389a8599bd8SSage Weil 			dout(" mds%d still flushing cap on %p\n",
2390a8599bd8SSage Weil 			     session->s_mds,
2391a8599bd8SSage Weil 			     &list_entry(session->s_cap_flushing.next,
2392a8599bd8SSage Weil 					 struct ceph_inode_info,
2393a8599bd8SSage Weil 					 i_flushing_item)->vfs_inode);
2394a8599bd8SSage Weil 		mdsc->num_cap_flushing--;
2395a8599bd8SSage Weil 		wake_up(&mdsc->cap_flushing_wq);
2396a8599bd8SSage Weil 		dout(" inode %p now !flushing\n", inode);
2397afcdaea3SSage Weil 
2398afcdaea3SSage Weil 		if (ci->i_dirty_caps == 0) {
2399a8599bd8SSage Weil 			dout(" inode %p now clean\n", inode);
2400afcdaea3SSage Weil 			BUG_ON(!list_empty(&ci->i_dirty_item));
2401afcdaea3SSage Weil 			drop = 1;
240276e3b390SSage Weil 		} else {
240376e3b390SSage Weil 			BUG_ON(list_empty(&ci->i_dirty_item));
2404afcdaea3SSage Weil 		}
2405a8599bd8SSage Weil 	}
2406a8599bd8SSage Weil 	spin_unlock(&mdsc->cap_dirty_lock);
2407a8599bd8SSage Weil 	wake_up(&ci->i_cap_wq);
2408a8599bd8SSage Weil 
2409a8599bd8SSage Weil out:
2410a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
2411afcdaea3SSage Weil 	if (drop)
2412a8599bd8SSage Weil 		iput(inode);
2413a8599bd8SSage Weil }
2414a8599bd8SSage Weil 
2415a8599bd8SSage Weil /*
2416a8599bd8SSage Weil  * Handle FLUSHSNAP_ACK.  MDS has flushed snap data to disk and we can
2417a8599bd8SSage Weil  * throw away our cap_snap.
2418a8599bd8SSage Weil  *
2419a8599bd8SSage Weil  * Caller hold s_mutex.
2420a8599bd8SSage Weil  */
24216df058c0SSage Weil static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
2422a8599bd8SSage Weil 				     struct ceph_mds_caps *m,
2423a8599bd8SSage Weil 				     struct ceph_mds_session *session)
2424a8599bd8SSage Weil {
2425a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
2426a8599bd8SSage Weil 	u64 follows = le64_to_cpu(m->snap_follows);
2427a8599bd8SSage Weil 	struct ceph_cap_snap *capsnap;
2428a8599bd8SSage Weil 	int drop = 0;
2429a8599bd8SSage Weil 
2430a8599bd8SSage Weil 	dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
2431a8599bd8SSage Weil 	     inode, ci, session->s_mds, follows);
2432a8599bd8SSage Weil 
2433a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
2434a8599bd8SSage Weil 	list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2435a8599bd8SSage Weil 		if (capsnap->follows == follows) {
2436a8599bd8SSage Weil 			if (capsnap->flush_tid != flush_tid) {
2437a8599bd8SSage Weil 				dout(" cap_snap %p follows %lld tid %lld !="
2438a8599bd8SSage Weil 				     " %lld\n", capsnap, follows,
2439a8599bd8SSage Weil 				     flush_tid, capsnap->flush_tid);
2440a8599bd8SSage Weil 				break;
2441a8599bd8SSage Weil 			}
2442a8599bd8SSage Weil 			WARN_ON(capsnap->dirty_pages || capsnap->writing);
2443a8599bd8SSage Weil 			dout(" removing cap_snap %p follows %lld\n",
2444a8599bd8SSage Weil 			     capsnap, follows);
2445a8599bd8SSage Weil 			ceph_put_snap_context(capsnap->context);
2446a8599bd8SSage Weil 			list_del(&capsnap->ci_item);
2447a8599bd8SSage Weil 			list_del(&capsnap->flushing_item);
2448a8599bd8SSage Weil 			ceph_put_cap_snap(capsnap);
2449a8599bd8SSage Weil 			drop = 1;
2450a8599bd8SSage Weil 			break;
2451a8599bd8SSage Weil 		} else {
2452a8599bd8SSage Weil 			dout(" skipping cap_snap %p follows %lld\n",
2453a8599bd8SSage Weil 			     capsnap, capsnap->follows);
2454a8599bd8SSage Weil 		}
2455a8599bd8SSage Weil 	}
2456a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
2457a8599bd8SSage Weil 	if (drop)
2458a8599bd8SSage Weil 		iput(inode);
2459a8599bd8SSage Weil }
2460a8599bd8SSage Weil 
2461a8599bd8SSage Weil /*
2462a8599bd8SSage Weil  * Handle TRUNC from MDS, indicating file truncation.
2463a8599bd8SSage Weil  *
2464a8599bd8SSage Weil  * caller hold s_mutex.
2465a8599bd8SSage Weil  */
2466a8599bd8SSage Weil static void handle_cap_trunc(struct inode *inode,
2467a8599bd8SSage Weil 			     struct ceph_mds_caps *trunc,
2468a8599bd8SSage Weil 			     struct ceph_mds_session *session)
2469a8599bd8SSage Weil 	__releases(inode->i_lock)
2470a8599bd8SSage Weil {
2471a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
2472a8599bd8SSage Weil 	int mds = session->s_mds;
2473a8599bd8SSage Weil 	int seq = le32_to_cpu(trunc->seq);
2474a8599bd8SSage Weil 	u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
2475a8599bd8SSage Weil 	u64 truncate_size = le64_to_cpu(trunc->truncate_size);
2476a8599bd8SSage Weil 	u64 size = le64_to_cpu(trunc->size);
2477a8599bd8SSage Weil 	int implemented = 0;
2478a8599bd8SSage Weil 	int dirty = __ceph_caps_dirty(ci);
2479a8599bd8SSage Weil 	int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
2480a8599bd8SSage Weil 	int queue_trunc = 0;
2481a8599bd8SSage Weil 
2482a8599bd8SSage Weil 	issued |= implemented | dirty;
2483a8599bd8SSage Weil 
2484a8599bd8SSage Weil 	dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
2485a8599bd8SSage Weil 	     inode, mds, seq, truncate_size, truncate_seq);
2486a8599bd8SSage Weil 	queue_trunc = ceph_fill_file_size(inode, issued,
2487a8599bd8SSage Weil 					  truncate_seq, truncate_size, size);
2488a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
2489a8599bd8SSage Weil 
2490a8599bd8SSage Weil 	if (queue_trunc)
24913c6f6b79SSage Weil 		ceph_queue_vmtruncate(inode);
2492a8599bd8SSage Weil }
2493a8599bd8SSage Weil 
2494a8599bd8SSage Weil /*
2495a8599bd8SSage Weil  * Handle EXPORT from MDS.  Cap is being migrated _from_ this mds to a
2496a8599bd8SSage Weil  * different one.  If we are the most recent migration we've seen (as
2497a8599bd8SSage Weil  * indicated by mseq), make note of the migrating cap bits for the
2498a8599bd8SSage Weil  * duration (until we see the corresponding IMPORT).
2499a8599bd8SSage Weil  *
2500a8599bd8SSage Weil  * caller holds s_mutex
2501a8599bd8SSage Weil  */
2502a8599bd8SSage Weil static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
2503a8599bd8SSage Weil 			      struct ceph_mds_session *session)
2504a8599bd8SSage Weil {
2505a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
2506a8599bd8SSage Weil 	int mds = session->s_mds;
2507a8599bd8SSage Weil 	unsigned mseq = le32_to_cpu(ex->migrate_seq);
2508a8599bd8SSage Weil 	struct ceph_cap *cap = NULL, *t;
2509a8599bd8SSage Weil 	struct rb_node *p;
2510a8599bd8SSage Weil 	int remember = 1;
2511a8599bd8SSage Weil 
2512a8599bd8SSage Weil 	dout("handle_cap_export inode %p ci %p mds%d mseq %d\n",
2513a8599bd8SSage Weil 	     inode, ci, mds, mseq);
2514a8599bd8SSage Weil 
2515a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
2516a8599bd8SSage Weil 
2517a8599bd8SSage Weil 	/* make sure we haven't seen a higher mseq */
2518a8599bd8SSage Weil 	for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
2519a8599bd8SSage Weil 		t = rb_entry(p, struct ceph_cap, ci_node);
2520a8599bd8SSage Weil 		if (ceph_seq_cmp(t->mseq, mseq) > 0) {
2521a8599bd8SSage Weil 			dout(" higher mseq on cap from mds%d\n",
2522a8599bd8SSage Weil 			     t->session->s_mds);
2523a8599bd8SSage Weil 			remember = 0;
2524a8599bd8SSage Weil 		}
2525a8599bd8SSage Weil 		if (t->session->s_mds == mds)
2526a8599bd8SSage Weil 			cap = t;
2527a8599bd8SSage Weil 	}
2528a8599bd8SSage Weil 
2529a8599bd8SSage Weil 	if (cap) {
2530a8599bd8SSage Weil 		if (remember) {
2531a8599bd8SSage Weil 			/* make note */
2532a8599bd8SSage Weil 			ci->i_cap_exporting_mds = mds;
2533a8599bd8SSage Weil 			ci->i_cap_exporting_mseq = mseq;
2534a8599bd8SSage Weil 			ci->i_cap_exporting_issued = cap->issued;
2535a8599bd8SSage Weil 		}
25367c1332b8SSage Weil 		__ceph_remove_cap(cap);
2537a8599bd8SSage Weil 	} else {
2538a8599bd8SSage Weil 		WARN_ON(!cap);
2539a8599bd8SSage Weil 	}
2540a8599bd8SSage Weil 
2541a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
2542a8599bd8SSage Weil }
2543a8599bd8SSage Weil 
2544a8599bd8SSage Weil /*
2545a8599bd8SSage Weil  * Handle cap IMPORT.  If there are temp bits from an older EXPORT,
2546a8599bd8SSage Weil  * clean them up.
2547a8599bd8SSage Weil  *
2548a8599bd8SSage Weil  * caller holds s_mutex.
2549a8599bd8SSage Weil  */
2550a8599bd8SSage Weil static void handle_cap_import(struct ceph_mds_client *mdsc,
2551a8599bd8SSage Weil 			      struct inode *inode, struct ceph_mds_caps *im,
2552a8599bd8SSage Weil 			      struct ceph_mds_session *session,
2553a8599bd8SSage Weil 			      void *snaptrace, int snaptrace_len)
2554a8599bd8SSage Weil {
2555a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
2556a8599bd8SSage Weil 	int mds = session->s_mds;
2557a8599bd8SSage Weil 	unsigned issued = le32_to_cpu(im->caps);
2558a8599bd8SSage Weil 	unsigned wanted = le32_to_cpu(im->wanted);
2559a8599bd8SSage Weil 	unsigned seq = le32_to_cpu(im->seq);
2560a8599bd8SSage Weil 	unsigned mseq = le32_to_cpu(im->migrate_seq);
2561a8599bd8SSage Weil 	u64 realmino = le64_to_cpu(im->realm);
2562a8599bd8SSage Weil 	u64 cap_id = le64_to_cpu(im->cap_id);
2563a8599bd8SSage Weil 
2564a8599bd8SSage Weil 	if (ci->i_cap_exporting_mds >= 0 &&
2565a8599bd8SSage Weil 	    ceph_seq_cmp(ci->i_cap_exporting_mseq, mseq) < 0) {
2566a8599bd8SSage Weil 		dout("handle_cap_import inode %p ci %p mds%d mseq %d"
2567a8599bd8SSage Weil 		     " - cleared exporting from mds%d\n",
2568a8599bd8SSage Weil 		     inode, ci, mds, mseq,
2569a8599bd8SSage Weil 		     ci->i_cap_exporting_mds);
2570a8599bd8SSage Weil 		ci->i_cap_exporting_issued = 0;
2571a8599bd8SSage Weil 		ci->i_cap_exporting_mseq = 0;
2572a8599bd8SSage Weil 		ci->i_cap_exporting_mds = -1;
2573a8599bd8SSage Weil 	} else {
2574a8599bd8SSage Weil 		dout("handle_cap_import inode %p ci %p mds%d mseq %d\n",
2575a8599bd8SSage Weil 		     inode, ci, mds, mseq);
2576a8599bd8SSage Weil 	}
2577a8599bd8SSage Weil 
2578a8599bd8SSage Weil 	down_write(&mdsc->snap_rwsem);
2579a8599bd8SSage Weil 	ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len,
2580a8599bd8SSage Weil 			       false);
2581a8599bd8SSage Weil 	downgrade_write(&mdsc->snap_rwsem);
2582a8599bd8SSage Weil 	ceph_add_cap(inode, session, cap_id, -1,
2583a8599bd8SSage Weil 		     issued, wanted, seq, mseq, realmino, CEPH_CAP_FLAG_AUTH,
2584a8599bd8SSage Weil 		     NULL /* no caps context */);
2585a8599bd8SSage Weil 	try_flush_caps(inode, session, NULL);
2586a8599bd8SSage Weil 	up_read(&mdsc->snap_rwsem);
2587a8599bd8SSage Weil }
2588a8599bd8SSage Weil 
2589a8599bd8SSage Weil /*
2590a8599bd8SSage Weil  * Handle a caps message from the MDS.
2591a8599bd8SSage Weil  *
2592a8599bd8SSage Weil  * Identify the appropriate session, inode, and call the right handler
2593a8599bd8SSage Weil  * based on the cap op.
2594a8599bd8SSage Weil  */
2595a8599bd8SSage Weil void ceph_handle_caps(struct ceph_mds_session *session,
2596a8599bd8SSage Weil 		      struct ceph_msg *msg)
2597a8599bd8SSage Weil {
2598a8599bd8SSage Weil 	struct ceph_mds_client *mdsc = session->s_mdsc;
2599a8599bd8SSage Weil 	struct super_block *sb = mdsc->client->sb;
2600a8599bd8SSage Weil 	struct inode *inode;
2601a8599bd8SSage Weil 	struct ceph_cap *cap;
2602a8599bd8SSage Weil 	struct ceph_mds_caps *h;
26032600d2ddSSage Weil 	int mds = session->s_mds;
2604a8599bd8SSage Weil 	int op;
2605a8599bd8SSage Weil 	u32 seq;
2606a8599bd8SSage Weil 	struct ceph_vino vino;
2607a8599bd8SSage Weil 	u64 cap_id;
2608a8599bd8SSage Weil 	u64 size, max_size;
26096df058c0SSage Weil 	u64 tid;
2610a8599bd8SSage Weil 	int check_caps = 0;
2611a8599bd8SSage Weil 	int r;
2612a8599bd8SSage Weil 
2613a8599bd8SSage Weil 	dout("handle_caps from mds%d\n", mds);
2614a8599bd8SSage Weil 
2615a8599bd8SSage Weil 	/* decode */
26166df058c0SSage Weil 	tid = le64_to_cpu(msg->hdr.tid);
2617a8599bd8SSage Weil 	if (msg->front.iov_len < sizeof(*h))
2618a8599bd8SSage Weil 		goto bad;
2619a8599bd8SSage Weil 	h = msg->front.iov_base;
2620a8599bd8SSage Weil 	op = le32_to_cpu(h->op);
2621a8599bd8SSage Weil 	vino.ino = le64_to_cpu(h->ino);
2622a8599bd8SSage Weil 	vino.snap = CEPH_NOSNAP;
2623a8599bd8SSage Weil 	cap_id = le64_to_cpu(h->cap_id);
2624a8599bd8SSage Weil 	seq = le32_to_cpu(h->seq);
2625a8599bd8SSage Weil 	size = le64_to_cpu(h->size);
2626a8599bd8SSage Weil 	max_size = le64_to_cpu(h->max_size);
2627a8599bd8SSage Weil 
2628a8599bd8SSage Weil 	mutex_lock(&session->s_mutex);
2629a8599bd8SSage Weil 	session->s_seq++;
2630a8599bd8SSage Weil 	dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
2631a8599bd8SSage Weil 	     (unsigned)seq);
2632a8599bd8SSage Weil 
2633a8599bd8SSage Weil 	/* lookup ino */
2634a8599bd8SSage Weil 	inode = ceph_find_inode(sb, vino);
2635a8599bd8SSage Weil 	dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
2636a8599bd8SSage Weil 	     vino.snap, inode);
2637a8599bd8SSage Weil 	if (!inode) {
2638a8599bd8SSage Weil 		dout(" i don't have ino %llx\n", vino.ino);
2639a8599bd8SSage Weil 		goto done;
2640a8599bd8SSage Weil 	}
2641a8599bd8SSage Weil 
2642a8599bd8SSage Weil 	/* these will work even if we don't have a cap yet */
2643a8599bd8SSage Weil 	switch (op) {
2644a8599bd8SSage Weil 	case CEPH_CAP_OP_FLUSHSNAP_ACK:
26456df058c0SSage Weil 		handle_cap_flushsnap_ack(inode, tid, h, session);
2646a8599bd8SSage Weil 		goto done;
2647a8599bd8SSage Weil 
2648a8599bd8SSage Weil 	case CEPH_CAP_OP_EXPORT:
2649a8599bd8SSage Weil 		handle_cap_export(inode, h, session);
2650a8599bd8SSage Weil 		goto done;
2651a8599bd8SSage Weil 
2652a8599bd8SSage Weil 	case CEPH_CAP_OP_IMPORT:
2653a8599bd8SSage Weil 		handle_cap_import(mdsc, inode, h, session,
2654a8599bd8SSage Weil 				  msg->middle,
2655a8599bd8SSage Weil 				  le32_to_cpu(h->snap_trace_len));
2656a8599bd8SSage Weil 		check_caps = 1; /* we may have sent a RELEASE to the old auth */
2657a8599bd8SSage Weil 		goto done;
2658a8599bd8SSage Weil 	}
2659a8599bd8SSage Weil 
2660a8599bd8SSage Weil 	/* the rest require a cap */
2661a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
2662a8599bd8SSage Weil 	cap = __get_cap_for_mds(ceph_inode(inode), mds);
2663a8599bd8SSage Weil 	if (!cap) {
2664a8599bd8SSage Weil 		dout("no cap on %p ino %llx.%llx from mds%d, releasing\n",
2665a8599bd8SSage Weil 		     inode, ceph_ino(inode), ceph_snap(inode), mds);
2666a8599bd8SSage Weil 		spin_unlock(&inode->i_lock);
2667a8599bd8SSage Weil 		goto done;
2668a8599bd8SSage Weil 	}
2669a8599bd8SSage Weil 
2670a8599bd8SSage Weil 	/* note that each of these drops i_lock for us */
2671a8599bd8SSage Weil 	switch (op) {
2672a8599bd8SSage Weil 	case CEPH_CAP_OP_REVOKE:
2673a8599bd8SSage Weil 	case CEPH_CAP_OP_GRANT:
2674a8599bd8SSage Weil 		r = handle_cap_grant(inode, h, session, cap, msg->middle);
2675a8599bd8SSage Weil 		if (r == 1)
2676a8599bd8SSage Weil 			ceph_check_caps(ceph_inode(inode),
2677a8599bd8SSage Weil 					CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
2678a8599bd8SSage Weil 					session);
2679a8599bd8SSage Weil 		else if (r == 2)
2680a8599bd8SSage Weil 			ceph_check_caps(ceph_inode(inode),
2681a8599bd8SSage Weil 					CHECK_CAPS_NODELAY,
2682a8599bd8SSage Weil 					session);
2683a8599bd8SSage Weil 		break;
2684a8599bd8SSage Weil 
2685a8599bd8SSage Weil 	case CEPH_CAP_OP_FLUSH_ACK:
26866df058c0SSage Weil 		handle_cap_flush_ack(inode, tid, h, session, cap);
2687a8599bd8SSage Weil 		break;
2688a8599bd8SSage Weil 
2689a8599bd8SSage Weil 	case CEPH_CAP_OP_TRUNC:
2690a8599bd8SSage Weil 		handle_cap_trunc(inode, h, session);
2691a8599bd8SSage Weil 		break;
2692a8599bd8SSage Weil 
2693a8599bd8SSage Weil 	default:
2694a8599bd8SSage Weil 		spin_unlock(&inode->i_lock);
2695a8599bd8SSage Weil 		pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
2696a8599bd8SSage Weil 		       ceph_cap_op_name(op));
2697a8599bd8SSage Weil 	}
2698a8599bd8SSage Weil 
2699a8599bd8SSage Weil done:
2700a8599bd8SSage Weil 	mutex_unlock(&session->s_mutex);
2701a8599bd8SSage Weil 
2702a8599bd8SSage Weil 	if (check_caps)
2703a8599bd8SSage Weil 		ceph_check_caps(ceph_inode(inode), CHECK_CAPS_NODELAY, NULL);
2704a8599bd8SSage Weil 	if (inode)
2705a8599bd8SSage Weil 		iput(inode);
2706a8599bd8SSage Weil 	return;
2707a8599bd8SSage Weil 
2708a8599bd8SSage Weil bad:
2709a8599bd8SSage Weil 	pr_err("ceph_handle_caps: corrupt message\n");
27109ec7cab1SSage Weil 	ceph_msg_dump(msg);
2711a8599bd8SSage Weil 	return;
2712a8599bd8SSage Weil }
2713a8599bd8SSage Weil 
2714a8599bd8SSage Weil /*
2715a8599bd8SSage Weil  * Delayed work handler to process end of delayed cap release LRU list.
2716a8599bd8SSage Weil  */
2717afcdaea3SSage Weil void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
2718a8599bd8SSage Weil {
2719a8599bd8SSage Weil 	struct ceph_inode_info *ci;
2720a8599bd8SSage Weil 	int flags = CHECK_CAPS_NODELAY;
2721a8599bd8SSage Weil 
2722a8599bd8SSage Weil 	dout("check_delayed_caps\n");
2723a8599bd8SSage Weil 	while (1) {
2724a8599bd8SSage Weil 		spin_lock(&mdsc->cap_delay_lock);
2725a8599bd8SSage Weil 		if (list_empty(&mdsc->cap_delay_list))
2726a8599bd8SSage Weil 			break;
2727a8599bd8SSage Weil 		ci = list_first_entry(&mdsc->cap_delay_list,
2728a8599bd8SSage Weil 				      struct ceph_inode_info,
2729a8599bd8SSage Weil 				      i_cap_delay_list);
2730a8599bd8SSage Weil 		if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
2731a8599bd8SSage Weil 		    time_before(jiffies, ci->i_hold_caps_max))
2732a8599bd8SSage Weil 			break;
2733a8599bd8SSage Weil 		list_del_init(&ci->i_cap_delay_list);
2734a8599bd8SSage Weil 		spin_unlock(&mdsc->cap_delay_lock);
2735a8599bd8SSage Weil 		dout("check_delayed_caps on %p\n", &ci->vfs_inode);
2736a8599bd8SSage Weil 		ceph_check_caps(ci, flags, NULL);
2737a8599bd8SSage Weil 	}
2738a8599bd8SSage Weil 	spin_unlock(&mdsc->cap_delay_lock);
2739a8599bd8SSage Weil }
2740a8599bd8SSage Weil 
2741a8599bd8SSage Weil /*
2742afcdaea3SSage Weil  * Flush all dirty caps to the mds
2743afcdaea3SSage Weil  */
2744afcdaea3SSage Weil void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
2745afcdaea3SSage Weil {
2746afcdaea3SSage Weil 	struct ceph_inode_info *ci;
2747afcdaea3SSage Weil 	struct inode *inode;
2748afcdaea3SSage Weil 
2749afcdaea3SSage Weil 	dout("flush_dirty_caps\n");
2750afcdaea3SSage Weil 	spin_lock(&mdsc->cap_dirty_lock);
2751afcdaea3SSage Weil 	while (!list_empty(&mdsc->cap_dirty)) {
2752afcdaea3SSage Weil 		ci = list_first_entry(&mdsc->cap_dirty,
2753afcdaea3SSage Weil 				      struct ceph_inode_info,
2754afcdaea3SSage Weil 				      i_dirty_item);
2755afcdaea3SSage Weil 		inode = igrab(&ci->vfs_inode);
2756afcdaea3SSage Weil 		spin_unlock(&mdsc->cap_dirty_lock);
2757afcdaea3SSage Weil 		if (inode) {
2758afcdaea3SSage Weil 			ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH,
2759afcdaea3SSage Weil 					NULL);
2760afcdaea3SSage Weil 			iput(inode);
2761afcdaea3SSage Weil 		}
2762afcdaea3SSage Weil 		spin_lock(&mdsc->cap_dirty_lock);
2763afcdaea3SSage Weil 	}
2764afcdaea3SSage Weil 	spin_unlock(&mdsc->cap_dirty_lock);
2765afcdaea3SSage Weil }
2766afcdaea3SSage Weil 
2767afcdaea3SSage Weil /*
2768a8599bd8SSage Weil  * Drop open file reference.  If we were the last open file,
2769a8599bd8SSage Weil  * we may need to release capabilities to the MDS (or schedule
2770a8599bd8SSage Weil  * their delayed release).
2771a8599bd8SSage Weil  */
2772a8599bd8SSage Weil void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
2773a8599bd8SSage Weil {
2774a8599bd8SSage Weil 	struct inode *inode = &ci->vfs_inode;
2775a8599bd8SSage Weil 	int last = 0;
2776a8599bd8SSage Weil 
2777a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
2778a8599bd8SSage Weil 	dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode,
2779a8599bd8SSage Weil 	     ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1);
2780a8599bd8SSage Weil 	BUG_ON(ci->i_nr_by_mode[fmode] == 0);
2781a8599bd8SSage Weil 	if (--ci->i_nr_by_mode[fmode] == 0)
2782a8599bd8SSage Weil 		last++;
2783a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
2784a8599bd8SSage Weil 
2785a8599bd8SSage Weil 	if (last && ci->i_vino.snap == CEPH_NOSNAP)
2786a8599bd8SSage Weil 		ceph_check_caps(ci, 0, NULL);
2787a8599bd8SSage Weil }
2788a8599bd8SSage Weil 
2789a8599bd8SSage Weil /*
2790a8599bd8SSage Weil  * Helpers for embedding cap and dentry lease releases into mds
2791a8599bd8SSage Weil  * requests.
2792a8599bd8SSage Weil  *
2793a8599bd8SSage Weil  * @force is used by dentry_release (below) to force inclusion of a
2794a8599bd8SSage Weil  * record for the directory inode, even when there aren't any caps to
2795a8599bd8SSage Weil  * drop.
2796a8599bd8SSage Weil  */
2797a8599bd8SSage Weil int ceph_encode_inode_release(void **p, struct inode *inode,
2798a8599bd8SSage Weil 			      int mds, int drop, int unless, int force)
2799a8599bd8SSage Weil {
2800a8599bd8SSage Weil 	struct ceph_inode_info *ci = ceph_inode(inode);
2801a8599bd8SSage Weil 	struct ceph_cap *cap;
2802a8599bd8SSage Weil 	struct ceph_mds_request_release *rel = *p;
2803a8599bd8SSage Weil 	int ret = 0;
2804a8599bd8SSage Weil 
2805a8599bd8SSage Weil 	dout("encode_inode_release %p mds%d drop %s unless %s\n", inode,
2806a8599bd8SSage Weil 	     mds, ceph_cap_string(drop), ceph_cap_string(unless));
2807a8599bd8SSage Weil 
2808a8599bd8SSage Weil 	spin_lock(&inode->i_lock);
2809a8599bd8SSage Weil 	cap = __get_cap_for_mds(ci, mds);
2810a8599bd8SSage Weil 	if (cap && __cap_is_valid(cap)) {
2811a8599bd8SSage Weil 		if (force ||
2812a8599bd8SSage Weil 		    ((cap->issued & drop) &&
2813a8599bd8SSage Weil 		     (cap->issued & unless) == 0)) {
2814a8599bd8SSage Weil 			if ((cap->issued & drop) &&
2815a8599bd8SSage Weil 			    (cap->issued & unless) == 0) {
2816a8599bd8SSage Weil 				dout("encode_inode_release %p cap %p %s -> "
2817a8599bd8SSage Weil 				     "%s\n", inode, cap,
2818a8599bd8SSage Weil 				     ceph_cap_string(cap->issued),
2819a8599bd8SSage Weil 				     ceph_cap_string(cap->issued & ~drop));
2820a8599bd8SSage Weil 				cap->issued &= ~drop;
2821a8599bd8SSage Weil 				cap->implemented &= ~drop;
2822a8599bd8SSage Weil 				if (ci->i_ceph_flags & CEPH_I_NODELAY) {
2823a8599bd8SSage Weil 					int wanted = __ceph_caps_wanted(ci);
2824a8599bd8SSage Weil 					dout("  wanted %s -> %s (act %s)\n",
2825a8599bd8SSage Weil 					     ceph_cap_string(cap->mds_wanted),
2826a8599bd8SSage Weil 					     ceph_cap_string(cap->mds_wanted &
2827a8599bd8SSage Weil 							     ~wanted),
2828a8599bd8SSage Weil 					     ceph_cap_string(wanted));
2829a8599bd8SSage Weil 					cap->mds_wanted &= wanted;
2830a8599bd8SSage Weil 				}
2831a8599bd8SSage Weil 			} else {
2832a8599bd8SSage Weil 				dout("encode_inode_release %p cap %p %s"
2833a8599bd8SSage Weil 				     " (force)\n", inode, cap,
2834a8599bd8SSage Weil 				     ceph_cap_string(cap->issued));
2835a8599bd8SSage Weil 			}
2836a8599bd8SSage Weil 
2837a8599bd8SSage Weil 			rel->ino = cpu_to_le64(ceph_ino(inode));
2838a8599bd8SSage Weil 			rel->cap_id = cpu_to_le64(cap->cap_id);
2839a8599bd8SSage Weil 			rel->seq = cpu_to_le32(cap->seq);
2840a8599bd8SSage Weil 			rel->issue_seq = cpu_to_le32(cap->issue_seq),
2841a8599bd8SSage Weil 			rel->mseq = cpu_to_le32(cap->mseq);
2842a8599bd8SSage Weil 			rel->caps = cpu_to_le32(cap->issued);
2843a8599bd8SSage Weil 			rel->wanted = cpu_to_le32(cap->mds_wanted);
2844a8599bd8SSage Weil 			rel->dname_len = 0;
2845a8599bd8SSage Weil 			rel->dname_seq = 0;
2846a8599bd8SSage Weil 			*p += sizeof(*rel);
2847a8599bd8SSage Weil 			ret = 1;
2848a8599bd8SSage Weil 		} else {
2849a8599bd8SSage Weil 			dout("encode_inode_release %p cap %p %s\n",
2850a8599bd8SSage Weil 			     inode, cap, ceph_cap_string(cap->issued));
2851a8599bd8SSage Weil 		}
2852a8599bd8SSage Weil 	}
2853a8599bd8SSage Weil 	spin_unlock(&inode->i_lock);
2854a8599bd8SSage Weil 	return ret;
2855a8599bd8SSage Weil }
2856a8599bd8SSage Weil 
2857a8599bd8SSage Weil int ceph_encode_dentry_release(void **p, struct dentry *dentry,
2858a8599bd8SSage Weil 			       int mds, int drop, int unless)
2859a8599bd8SSage Weil {
2860a8599bd8SSage Weil 	struct inode *dir = dentry->d_parent->d_inode;
2861a8599bd8SSage Weil 	struct ceph_mds_request_release *rel = *p;
2862a8599bd8SSage Weil 	struct ceph_dentry_info *di = ceph_dentry(dentry);
2863a8599bd8SSage Weil 	int force = 0;
2864a8599bd8SSage Weil 	int ret;
2865a8599bd8SSage Weil 
2866a8599bd8SSage Weil 	/*
2867a8599bd8SSage Weil 	 * force an record for the directory caps if we have a dentry lease.
2868a8599bd8SSage Weil 	 * this is racy (can't take i_lock and d_lock together), but it
2869a8599bd8SSage Weil 	 * doesn't have to be perfect; the mds will revoke anything we don't
2870a8599bd8SSage Weil 	 * release.
2871a8599bd8SSage Weil 	 */
2872a8599bd8SSage Weil 	spin_lock(&dentry->d_lock);
2873a8599bd8SSage Weil 	if (di->lease_session && di->lease_session->s_mds == mds)
2874a8599bd8SSage Weil 		force = 1;
2875a8599bd8SSage Weil 	spin_unlock(&dentry->d_lock);
2876a8599bd8SSage Weil 
2877a8599bd8SSage Weil 	ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
2878a8599bd8SSage Weil 
2879a8599bd8SSage Weil 	spin_lock(&dentry->d_lock);
2880a8599bd8SSage Weil 	if (ret && di->lease_session && di->lease_session->s_mds == mds) {
2881a8599bd8SSage Weil 		dout("encode_dentry_release %p mds%d seq %d\n",
2882a8599bd8SSage Weil 		     dentry, mds, (int)di->lease_seq);
2883a8599bd8SSage Weil 		rel->dname_len = cpu_to_le32(dentry->d_name.len);
2884a8599bd8SSage Weil 		memcpy(*p, dentry->d_name.name, dentry->d_name.len);
2885a8599bd8SSage Weil 		*p += dentry->d_name.len;
2886a8599bd8SSage Weil 		rel->dname_seq = cpu_to_le32(di->lease_seq);
2887a8599bd8SSage Weil 	}
2888a8599bd8SSage Weil 	spin_unlock(&dentry->d_lock);
2889a8599bd8SSage Weil 	return ret;
2890a8599bd8SSage Weil }
2891