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Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001#include <linux/ceph/ceph_debug.h>
Sage Weila8599bd2009-10-06 11:31:12 -07002
3#include <linux/fs.h>
4#include <linux/kernel.h>
5#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09006#include <linux/slab.h>
Sage Weila8599bd2009-10-06 11:31:12 -07007#include <linux/vmalloc.h>
8#include <linux/wait.h>
Stephen Rothwellf1a3d572010-01-18 11:53:08 +11009#include <linux/writeback.h>
Sage Weila8599bd2009-10-06 11:31:12 -070010
11#include "super.h"
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -070012#include "mds_client.h"
13#include <linux/ceph/decode.h>
14#include <linux/ceph/messenger.h>
Sage Weila8599bd2009-10-06 11:31:12 -070015
16/*
17 * Capability management
18 *
19 * The Ceph metadata servers control client access to inode metadata
20 * and file data by issuing capabilities, granting clients permission
21 * to read and/or write both inode field and file data to OSDs
22 * (storage nodes). Each capability consists of a set of bits
23 * indicating which operations are allowed.
24 *
25 * If the client holds a *_SHARED cap, the client has a coherent value
26 * that can be safely read from the cached inode.
27 *
28 * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
29 * client is allowed to change inode attributes (e.g., file size,
30 * mtime), note its dirty state in the ceph_cap, and asynchronously
31 * flush that metadata change to the MDS.
32 *
33 * In the event of a conflicting operation (perhaps by another
34 * client), the MDS will revoke the conflicting client capabilities.
35 *
36 * In order for a client to cache an inode, it must hold a capability
37 * with at least one MDS server. When inodes are released, release
38 * notifications are batched and periodically sent en masse to the MDS
39 * cluster to release server state.
40 */
41
42
43/*
44 * Generate readable cap strings for debugging output.
45 */
46#define MAX_CAP_STR 20
47static char cap_str[MAX_CAP_STR][40];
48static DEFINE_SPINLOCK(cap_str_lock);
49static int last_cap_str;
50
51static char *gcap_string(char *s, int c)
52{
53 if (c & CEPH_CAP_GSHARED)
54 *s++ = 's';
55 if (c & CEPH_CAP_GEXCL)
56 *s++ = 'x';
57 if (c & CEPH_CAP_GCACHE)
58 *s++ = 'c';
59 if (c & CEPH_CAP_GRD)
60 *s++ = 'r';
61 if (c & CEPH_CAP_GWR)
62 *s++ = 'w';
63 if (c & CEPH_CAP_GBUFFER)
64 *s++ = 'b';
65 if (c & CEPH_CAP_GLAZYIO)
66 *s++ = 'l';
67 return s;
68}
69
70const char *ceph_cap_string(int caps)
71{
72 int i;
73 char *s;
74 int c;
75
76 spin_lock(&cap_str_lock);
77 i = last_cap_str++;
78 if (last_cap_str == MAX_CAP_STR)
79 last_cap_str = 0;
80 spin_unlock(&cap_str_lock);
81
82 s = cap_str[i];
83
84 if (caps & CEPH_CAP_PIN)
85 *s++ = 'p';
86
87 c = (caps >> CEPH_CAP_SAUTH) & 3;
88 if (c) {
89 *s++ = 'A';
90 s = gcap_string(s, c);
91 }
92
93 c = (caps >> CEPH_CAP_SLINK) & 3;
94 if (c) {
95 *s++ = 'L';
96 s = gcap_string(s, c);
97 }
98
99 c = (caps >> CEPH_CAP_SXATTR) & 3;
100 if (c) {
101 *s++ = 'X';
102 s = gcap_string(s, c);
103 }
104
105 c = caps >> CEPH_CAP_SFILE;
106 if (c) {
107 *s++ = 'F';
108 s = gcap_string(s, c);
109 }
110
111 if (s == cap_str[i])
112 *s++ = '-';
113 *s = 0;
114 return cap_str[i];
115}
116
Yehuda Sadeh37151662010-06-17 16:16:12 -0700117void ceph_caps_init(struct ceph_mds_client *mdsc)
Sage Weila8599bd2009-10-06 11:31:12 -0700118{
Yehuda Sadeh37151662010-06-17 16:16:12 -0700119 INIT_LIST_HEAD(&mdsc->caps_list);
120 spin_lock_init(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700121}
122
Yehuda Sadeh37151662010-06-17 16:16:12 -0700123void ceph_caps_finalize(struct ceph_mds_client *mdsc)
Sage Weila8599bd2009-10-06 11:31:12 -0700124{
125 struct ceph_cap *cap;
126
Yehuda Sadeh37151662010-06-17 16:16:12 -0700127 spin_lock(&mdsc->caps_list_lock);
128 while (!list_empty(&mdsc->caps_list)) {
129 cap = list_first_entry(&mdsc->caps_list,
130 struct ceph_cap, caps_item);
Sage Weila8599bd2009-10-06 11:31:12 -0700131 list_del(&cap->caps_item);
132 kmem_cache_free(ceph_cap_cachep, cap);
133 }
Yehuda Sadeh37151662010-06-17 16:16:12 -0700134 mdsc->caps_total_count = 0;
135 mdsc->caps_avail_count = 0;
136 mdsc->caps_use_count = 0;
137 mdsc->caps_reserve_count = 0;
138 mdsc->caps_min_count = 0;
139 spin_unlock(&mdsc->caps_list_lock);
Sage Weil85ccce42010-02-17 10:02:43 -0800140}
141
Yehuda Sadeh37151662010-06-17 16:16:12 -0700142void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta)
Sage Weil85ccce42010-02-17 10:02:43 -0800143{
Yehuda Sadeh37151662010-06-17 16:16:12 -0700144 spin_lock(&mdsc->caps_list_lock);
145 mdsc->caps_min_count += delta;
146 BUG_ON(mdsc->caps_min_count < 0);
147 spin_unlock(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700148}
149
Yehuda Sadeh37151662010-06-17 16:16:12 -0700150int ceph_reserve_caps(struct ceph_mds_client *mdsc,
151 struct ceph_cap_reservation *ctx, int need)
Sage Weila8599bd2009-10-06 11:31:12 -0700152{
153 int i;
154 struct ceph_cap *cap;
155 int have;
156 int alloc = 0;
157 LIST_HEAD(newcaps);
158 int ret = 0;
159
160 dout("reserve caps ctx=%p need=%d\n", ctx, need);
161
162 /* first reserve any caps that are already allocated */
Yehuda Sadeh37151662010-06-17 16:16:12 -0700163 spin_lock(&mdsc->caps_list_lock);
164 if (mdsc->caps_avail_count >= need)
Sage Weila8599bd2009-10-06 11:31:12 -0700165 have = need;
166 else
Yehuda Sadeh37151662010-06-17 16:16:12 -0700167 have = mdsc->caps_avail_count;
168 mdsc->caps_avail_count -= have;
169 mdsc->caps_reserve_count += have;
170 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
171 mdsc->caps_reserve_count +
172 mdsc->caps_avail_count);
173 spin_unlock(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700174
175 for (i = have; i < need; i++) {
176 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
177 if (!cap) {
178 ret = -ENOMEM;
179 goto out_alloc_count;
180 }
181 list_add(&cap->caps_item, &newcaps);
182 alloc++;
183 }
184 BUG_ON(have + alloc != need);
185
Yehuda Sadeh37151662010-06-17 16:16:12 -0700186 spin_lock(&mdsc->caps_list_lock);
187 mdsc->caps_total_count += alloc;
188 mdsc->caps_reserve_count += alloc;
189 list_splice(&newcaps, &mdsc->caps_list);
Sage Weila8599bd2009-10-06 11:31:12 -0700190
Yehuda Sadeh37151662010-06-17 16:16:12 -0700191 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
192 mdsc->caps_reserve_count +
193 mdsc->caps_avail_count);
194 spin_unlock(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700195
196 ctx->count = need;
197 dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
Yehuda Sadeh37151662010-06-17 16:16:12 -0700198 ctx, mdsc->caps_total_count, mdsc->caps_use_count,
199 mdsc->caps_reserve_count, mdsc->caps_avail_count);
Sage Weila8599bd2009-10-06 11:31:12 -0700200 return 0;
201
202out_alloc_count:
203 /* we didn't manage to reserve as much as we needed */
204 pr_warning("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
205 ctx, need, have);
206 return ret;
207}
208
Yehuda Sadeh37151662010-06-17 16:16:12 -0700209int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
210 struct ceph_cap_reservation *ctx)
Sage Weila8599bd2009-10-06 11:31:12 -0700211{
212 dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
213 if (ctx->count) {
Yehuda Sadeh37151662010-06-17 16:16:12 -0700214 spin_lock(&mdsc->caps_list_lock);
215 BUG_ON(mdsc->caps_reserve_count < ctx->count);
216 mdsc->caps_reserve_count -= ctx->count;
217 mdsc->caps_avail_count += ctx->count;
Sage Weila8599bd2009-10-06 11:31:12 -0700218 ctx->count = 0;
219 dout("unreserve caps %d = %d used + %d resv + %d avail\n",
Yehuda Sadeh37151662010-06-17 16:16:12 -0700220 mdsc->caps_total_count, mdsc->caps_use_count,
221 mdsc->caps_reserve_count, mdsc->caps_avail_count);
222 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
223 mdsc->caps_reserve_count +
224 mdsc->caps_avail_count);
225 spin_unlock(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700226 }
227 return 0;
228}
229
Yehuda Sadeh37151662010-06-17 16:16:12 -0700230static struct ceph_cap *get_cap(struct ceph_mds_client *mdsc,
231 struct ceph_cap_reservation *ctx)
Sage Weila8599bd2009-10-06 11:31:12 -0700232{
233 struct ceph_cap *cap = NULL;
234
235 /* temporary, until we do something about cap import/export */
Sage Weil443b3762010-06-29 09:28:39 -0700236 if (!ctx) {
237 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
238 if (cap) {
Yehuda Sadeh37151662010-06-17 16:16:12 -0700239 mdsc->caps_use_count++;
240 mdsc->caps_total_count++;
Sage Weil443b3762010-06-29 09:28:39 -0700241 }
242 return cap;
243 }
Sage Weila8599bd2009-10-06 11:31:12 -0700244
Yehuda Sadeh37151662010-06-17 16:16:12 -0700245 spin_lock(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700246 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
Yehuda Sadeh37151662010-06-17 16:16:12 -0700247 ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
248 mdsc->caps_reserve_count, mdsc->caps_avail_count);
Sage Weila8599bd2009-10-06 11:31:12 -0700249 BUG_ON(!ctx->count);
Yehuda Sadeh37151662010-06-17 16:16:12 -0700250 BUG_ON(ctx->count > mdsc->caps_reserve_count);
251 BUG_ON(list_empty(&mdsc->caps_list));
Sage Weila8599bd2009-10-06 11:31:12 -0700252
253 ctx->count--;
Yehuda Sadeh37151662010-06-17 16:16:12 -0700254 mdsc->caps_reserve_count--;
255 mdsc->caps_use_count++;
Sage Weila8599bd2009-10-06 11:31:12 -0700256
Yehuda Sadeh37151662010-06-17 16:16:12 -0700257 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
Sage Weila8599bd2009-10-06 11:31:12 -0700258 list_del(&cap->caps_item);
259
Yehuda Sadeh37151662010-06-17 16:16:12 -0700260 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
261 mdsc->caps_reserve_count + mdsc->caps_avail_count);
262 spin_unlock(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700263 return cap;
264}
265
Yehuda Sadeh37151662010-06-17 16:16:12 -0700266void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
Sage Weila8599bd2009-10-06 11:31:12 -0700267{
Yehuda Sadeh37151662010-06-17 16:16:12 -0700268 spin_lock(&mdsc->caps_list_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -0800269 dout("put_cap %p %d = %d used + %d resv + %d avail\n",
Yehuda Sadeh37151662010-06-17 16:16:12 -0700270 cap, mdsc->caps_total_count, mdsc->caps_use_count,
271 mdsc->caps_reserve_count, mdsc->caps_avail_count);
272 mdsc->caps_use_count--;
Sage Weila8599bd2009-10-06 11:31:12 -0700273 /*
Sage Weil85ccce42010-02-17 10:02:43 -0800274 * Keep some preallocated caps around (ceph_min_count), to
275 * avoid lots of free/alloc churn.
Sage Weila8599bd2009-10-06 11:31:12 -0700276 */
Yehuda Sadeh37151662010-06-17 16:16:12 -0700277 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
278 mdsc->caps_min_count) {
279 mdsc->caps_total_count--;
Sage Weila8599bd2009-10-06 11:31:12 -0700280 kmem_cache_free(ceph_cap_cachep, cap);
281 } else {
Yehuda Sadeh37151662010-06-17 16:16:12 -0700282 mdsc->caps_avail_count++;
283 list_add(&cap->caps_item, &mdsc->caps_list);
Sage Weila8599bd2009-10-06 11:31:12 -0700284 }
285
Yehuda Sadeh37151662010-06-17 16:16:12 -0700286 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
287 mdsc->caps_reserve_count + mdsc->caps_avail_count);
288 spin_unlock(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700289}
290
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700291void ceph_reservation_status(struct ceph_fs_client *fsc,
Sage Weil85ccce42010-02-17 10:02:43 -0800292 int *total, int *avail, int *used, int *reserved,
293 int *min)
Sage Weila8599bd2009-10-06 11:31:12 -0700294{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700295 struct ceph_mds_client *mdsc = fsc->mdsc;
Yehuda Sadeh37151662010-06-17 16:16:12 -0700296
Sage Weila8599bd2009-10-06 11:31:12 -0700297 if (total)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700298 *total = mdsc->caps_total_count;
Sage Weila8599bd2009-10-06 11:31:12 -0700299 if (avail)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700300 *avail = mdsc->caps_avail_count;
Sage Weila8599bd2009-10-06 11:31:12 -0700301 if (used)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700302 *used = mdsc->caps_use_count;
Sage Weila8599bd2009-10-06 11:31:12 -0700303 if (reserved)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700304 *reserved = mdsc->caps_reserve_count;
Sage Weil85ccce42010-02-17 10:02:43 -0800305 if (min)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700306 *min = mdsc->caps_min_count;
Sage Weila8599bd2009-10-06 11:31:12 -0700307}
308
309/*
310 * Find ceph_cap for given mds, if any.
311 *
Sage Weilbe655592011-11-30 09:47:09 -0800312 * Called with i_ceph_lock held.
Sage Weila8599bd2009-10-06 11:31:12 -0700313 */
314static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
315{
316 struct ceph_cap *cap;
317 struct rb_node *n = ci->i_caps.rb_node;
318
319 while (n) {
320 cap = rb_entry(n, struct ceph_cap, ci_node);
321 if (mds < cap->mds)
322 n = n->rb_left;
323 else if (mds > cap->mds)
324 n = n->rb_right;
325 else
326 return cap;
327 }
328 return NULL;
329}
330
Greg Farnum2bc50252010-06-30 12:44:34 -0700331struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
332{
333 struct ceph_cap *cap;
334
Sage Weilbe655592011-11-30 09:47:09 -0800335 spin_lock(&ci->i_ceph_lock);
Greg Farnum2bc50252010-06-30 12:44:34 -0700336 cap = __get_cap_for_mds(ci, mds);
Sage Weilbe655592011-11-30 09:47:09 -0800337 spin_unlock(&ci->i_ceph_lock);
Greg Farnum2bc50252010-06-30 12:44:34 -0700338 return cap;
339}
340
Sage Weila8599bd2009-10-06 11:31:12 -0700341/*
Sage Weil33caad32010-05-26 14:31:27 -0700342 * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
Sage Weila8599bd2009-10-06 11:31:12 -0700343 */
Sage Weilca81f3f2010-06-10 14:21:36 -0700344static int __ceph_get_cap_mds(struct ceph_inode_info *ci)
Sage Weila8599bd2009-10-06 11:31:12 -0700345{
346 struct ceph_cap *cap;
347 int mds = -1;
348 struct rb_node *p;
349
Sage Weil33caad32010-05-26 14:31:27 -0700350 /* prefer mds with WR|BUFFER|EXCL caps */
Sage Weila8599bd2009-10-06 11:31:12 -0700351 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
352 cap = rb_entry(p, struct ceph_cap, ci_node);
353 mds = cap->mds;
Sage Weila8599bd2009-10-06 11:31:12 -0700354 if (cap->issued & (CEPH_CAP_FILE_WR |
355 CEPH_CAP_FILE_BUFFER |
356 CEPH_CAP_FILE_EXCL))
357 break;
358 }
359 return mds;
360}
361
362int ceph_get_cap_mds(struct inode *inode)
363{
Sage Weilbe655592011-11-30 09:47:09 -0800364 struct ceph_inode_info *ci = ceph_inode(inode);
Sage Weila8599bd2009-10-06 11:31:12 -0700365 int mds;
Sage Weilbe655592011-11-30 09:47:09 -0800366 spin_lock(&ci->i_ceph_lock);
Sage Weilca81f3f2010-06-10 14:21:36 -0700367 mds = __ceph_get_cap_mds(ceph_inode(inode));
Sage Weilbe655592011-11-30 09:47:09 -0800368 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700369 return mds;
370}
371
372/*
Sage Weilbe655592011-11-30 09:47:09 -0800373 * Called under i_ceph_lock.
Sage Weila8599bd2009-10-06 11:31:12 -0700374 */
375static void __insert_cap_node(struct ceph_inode_info *ci,
376 struct ceph_cap *new)
377{
378 struct rb_node **p = &ci->i_caps.rb_node;
379 struct rb_node *parent = NULL;
380 struct ceph_cap *cap = NULL;
381
382 while (*p) {
383 parent = *p;
384 cap = rb_entry(parent, struct ceph_cap, ci_node);
385 if (new->mds < cap->mds)
386 p = &(*p)->rb_left;
387 else if (new->mds > cap->mds)
388 p = &(*p)->rb_right;
389 else
390 BUG();
391 }
392
393 rb_link_node(&new->ci_node, parent, p);
394 rb_insert_color(&new->ci_node, &ci->i_caps);
395}
396
397/*
398 * (re)set cap hold timeouts, which control the delayed release
399 * of unused caps back to the MDS. Should be called on cap use.
400 */
401static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
402 struct ceph_inode_info *ci)
403{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700404 struct ceph_mount_options *ma = mdsc->fsc->mount_options;
Sage Weila8599bd2009-10-06 11:31:12 -0700405
406 ci->i_hold_caps_min = round_jiffies(jiffies +
407 ma->caps_wanted_delay_min * HZ);
408 ci->i_hold_caps_max = round_jiffies(jiffies +
409 ma->caps_wanted_delay_max * HZ);
410 dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
411 ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
412}
413
414/*
415 * (Re)queue cap at the end of the delayed cap release list.
416 *
417 * If I_FLUSH is set, leave the inode at the front of the list.
418 *
Sage Weilbe655592011-11-30 09:47:09 -0800419 * Caller holds i_ceph_lock
Sage Weila8599bd2009-10-06 11:31:12 -0700420 * -> we take mdsc->cap_delay_lock
421 */
422static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
423 struct ceph_inode_info *ci)
424{
425 __cap_set_timeouts(mdsc, ci);
426 dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
427 ci->i_ceph_flags, ci->i_hold_caps_max);
428 if (!mdsc->stopping) {
429 spin_lock(&mdsc->cap_delay_lock);
430 if (!list_empty(&ci->i_cap_delay_list)) {
431 if (ci->i_ceph_flags & CEPH_I_FLUSH)
432 goto no_change;
433 list_del_init(&ci->i_cap_delay_list);
434 }
435 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
436no_change:
437 spin_unlock(&mdsc->cap_delay_lock);
438 }
439}
440
441/*
442 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
443 * indicating we should send a cap message to flush dirty metadata
444 * asap, and move to the front of the delayed cap list.
445 */
446static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
447 struct ceph_inode_info *ci)
448{
449 dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
450 spin_lock(&mdsc->cap_delay_lock);
451 ci->i_ceph_flags |= CEPH_I_FLUSH;
452 if (!list_empty(&ci->i_cap_delay_list))
453 list_del_init(&ci->i_cap_delay_list);
454 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
455 spin_unlock(&mdsc->cap_delay_lock);
456}
457
458/*
459 * Cancel delayed work on cap.
460 *
Sage Weilbe655592011-11-30 09:47:09 -0800461 * Caller must hold i_ceph_lock.
Sage Weila8599bd2009-10-06 11:31:12 -0700462 */
463static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
464 struct ceph_inode_info *ci)
465{
466 dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
467 if (list_empty(&ci->i_cap_delay_list))
468 return;
469 spin_lock(&mdsc->cap_delay_lock);
470 list_del_init(&ci->i_cap_delay_list);
471 spin_unlock(&mdsc->cap_delay_lock);
472}
473
474/*
475 * Common issue checks for add_cap, handle_cap_grant.
476 */
477static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
478 unsigned issued)
479{
480 unsigned had = __ceph_caps_issued(ci, NULL);
481
482 /*
483 * Each time we receive FILE_CACHE anew, we increment
484 * i_rdcache_gen.
485 */
Sage Weil29625072010-05-27 10:40:43 -0700486 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
487 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0)
Sage Weila8599bd2009-10-06 11:31:12 -0700488 ci->i_rdcache_gen++;
489
490 /*
Sage Weilc6ffe102011-11-03 09:23:36 -0700491 * if we are newly issued FILE_SHARED, clear D_COMPLETE; we
Sage Weila8599bd2009-10-06 11:31:12 -0700492 * don't know what happened to this directory while we didn't
493 * have the cap.
494 */
495 if ((issued & CEPH_CAP_FILE_SHARED) &&
496 (had & CEPH_CAP_FILE_SHARED) == 0) {
497 ci->i_shared_gen++;
Sage Weilc6ffe102011-11-03 09:23:36 -0700498 if (S_ISDIR(ci->vfs_inode.i_mode))
499 ceph_dir_clear_complete(&ci->vfs_inode);
Sage Weila8599bd2009-10-06 11:31:12 -0700500 }
501}
502
503/*
504 * Add a capability under the given MDS session.
505 *
506 * Caller should hold session snap_rwsem (read) and s_mutex.
507 *
508 * @fmode is the open file mode, if we are opening a file, otherwise
509 * it is < 0. (This is so we can atomically add the cap and add an
510 * open file reference to it.)
511 */
512int ceph_add_cap(struct inode *inode,
513 struct ceph_mds_session *session, u64 cap_id,
514 int fmode, unsigned issued, unsigned wanted,
515 unsigned seq, unsigned mseq, u64 realmino, int flags,
516 struct ceph_cap_reservation *caps_reservation)
517{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700518 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -0700519 struct ceph_inode_info *ci = ceph_inode(inode);
520 struct ceph_cap *new_cap = NULL;
521 struct ceph_cap *cap;
522 int mds = session->s_mds;
523 int actual_wanted;
524
525 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
526 session->s_mds, cap_id, ceph_cap_string(issued), seq);
527
528 /*
529 * If we are opening the file, include file mode wanted bits
530 * in wanted.
531 */
532 if (fmode >= 0)
533 wanted |= ceph_caps_for_mode(fmode);
534
535retry:
Sage Weilbe655592011-11-30 09:47:09 -0800536 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700537 cap = __get_cap_for_mds(ci, mds);
538 if (!cap) {
539 if (new_cap) {
540 cap = new_cap;
541 new_cap = NULL;
542 } else {
Sage Weilbe655592011-11-30 09:47:09 -0800543 spin_unlock(&ci->i_ceph_lock);
Yehuda Sadeh37151662010-06-17 16:16:12 -0700544 new_cap = get_cap(mdsc, caps_reservation);
Sage Weila8599bd2009-10-06 11:31:12 -0700545 if (new_cap == NULL)
546 return -ENOMEM;
547 goto retry;
548 }
549
550 cap->issued = 0;
551 cap->implemented = 0;
552 cap->mds = mds;
553 cap->mds_wanted = 0;
554
555 cap->ci = ci;
556 __insert_cap_node(ci, cap);
557
558 /* clear out old exporting info? (i.e. on cap import) */
559 if (ci->i_cap_exporting_mds == mds) {
560 ci->i_cap_exporting_issued = 0;
561 ci->i_cap_exporting_mseq = 0;
562 ci->i_cap_exporting_mds = -1;
563 }
564
565 /* add to session cap list */
566 cap->session = session;
567 spin_lock(&session->s_cap_lock);
568 list_add_tail(&cap->session_caps, &session->s_caps);
569 session->s_nr_caps++;
570 spin_unlock(&session->s_cap_lock);
Sage Weil35403032011-05-12 15:13:23 -0700571 } else if (new_cap)
572 ceph_put_cap(mdsc, new_cap);
Sage Weila8599bd2009-10-06 11:31:12 -0700573
574 if (!ci->i_snap_realm) {
575 /*
576 * add this inode to the appropriate snap realm
577 */
578 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
579 realmino);
580 if (realm) {
581 ceph_get_snap_realm(mdsc, realm);
582 spin_lock(&realm->inodes_with_caps_lock);
583 ci->i_snap_realm = realm;
584 list_add(&ci->i_snap_realm_item,
585 &realm->inodes_with_caps);
586 spin_unlock(&realm->inodes_with_caps_lock);
587 } else {
588 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
589 realmino);
Sage Weilb8cd07e2010-07-16 12:00:02 -0700590 WARN_ON(!realm);
Sage Weila8599bd2009-10-06 11:31:12 -0700591 }
592 }
593
594 __check_cap_issue(ci, cap, issued);
595
596 /*
597 * If we are issued caps we don't want, or the mds' wanted
598 * value appears to be off, queue a check so we'll release
599 * later and/or update the mds wanted value.
600 */
601 actual_wanted = __ceph_caps_wanted(ci);
602 if ((wanted & ~actual_wanted) ||
603 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
604 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
605 ceph_cap_string(issued), ceph_cap_string(wanted),
606 ceph_cap_string(actual_wanted));
607 __cap_delay_requeue(mdsc, ci);
608 }
609
610 if (flags & CEPH_CAP_FLAG_AUTH)
611 ci->i_auth_cap = cap;
612 else if (ci->i_auth_cap == cap)
613 ci->i_auth_cap = NULL;
614
615 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
616 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
617 ceph_cap_string(issued|cap->issued), seq, mds);
618 cap->cap_id = cap_id;
619 cap->issued = issued;
620 cap->implemented |= issued;
621 cap->mds_wanted |= wanted;
622 cap->seq = seq;
623 cap->issue_seq = seq;
624 cap->mseq = mseq;
Sage Weil685f9a5d2009-11-09 12:05:48 -0800625 cap->cap_gen = session->s_cap_gen;
Sage Weila8599bd2009-10-06 11:31:12 -0700626
627 if (fmode >= 0)
628 __ceph_get_fmode(ci, fmode);
Sage Weilbe655592011-11-30 09:47:09 -0800629 spin_unlock(&ci->i_ceph_lock);
Yehuda Sadeh03066f22010-07-27 13:11:08 -0700630 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -0700631 return 0;
632}
633
634/*
635 * Return true if cap has not timed out and belongs to the current
636 * generation of the MDS session (i.e. has not gone 'stale' due to
637 * us losing touch with the mds).
638 */
639static int __cap_is_valid(struct ceph_cap *cap)
640{
641 unsigned long ttl;
Sage Weilcdac8302009-11-10 16:02:23 -0800642 u32 gen;
Sage Weila8599bd2009-10-06 11:31:12 -0700643
644 spin_lock(&cap->session->s_cap_lock);
645 gen = cap->session->s_cap_gen;
646 ttl = cap->session->s_cap_ttl;
647 spin_unlock(&cap->session->s_cap_lock);
648
Sage Weil685f9a5d2009-11-09 12:05:48 -0800649 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
Sage Weila8599bd2009-10-06 11:31:12 -0700650 dout("__cap_is_valid %p cap %p issued %s "
651 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
Sage Weil685f9a5d2009-11-09 12:05:48 -0800652 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
Sage Weila8599bd2009-10-06 11:31:12 -0700653 return 0;
654 }
655
656 return 1;
657}
658
659/*
660 * Return set of valid cap bits issued to us. Note that caps time
661 * out, and may be invalidated in bulk if the client session times out
662 * and session->s_cap_gen is bumped.
663 */
664int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
665{
Sage Weil7af8f1e2010-03-01 15:17:34 -0800666 int have = ci->i_snap_caps | ci->i_cap_exporting_issued;
Sage Weila8599bd2009-10-06 11:31:12 -0700667 struct ceph_cap *cap;
668 struct rb_node *p;
669
670 if (implemented)
671 *implemented = 0;
672 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
673 cap = rb_entry(p, struct ceph_cap, ci_node);
674 if (!__cap_is_valid(cap))
675 continue;
676 dout("__ceph_caps_issued %p cap %p issued %s\n",
677 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
678 have |= cap->issued;
679 if (implemented)
680 *implemented |= cap->implemented;
681 }
682 return have;
683}
684
685/*
686 * Get cap bits issued by caps other than @ocap
687 */
688int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
689{
690 int have = ci->i_snap_caps;
691 struct ceph_cap *cap;
692 struct rb_node *p;
693
694 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
695 cap = rb_entry(p, struct ceph_cap, ci_node);
696 if (cap == ocap)
697 continue;
698 if (!__cap_is_valid(cap))
699 continue;
700 have |= cap->issued;
701 }
702 return have;
703}
704
705/*
706 * Move a cap to the end of the LRU (oldest caps at list head, newest
707 * at list tail).
708 */
709static void __touch_cap(struct ceph_cap *cap)
710{
711 struct ceph_mds_session *s = cap->session;
712
Sage Weila8599bd2009-10-06 11:31:12 -0700713 spin_lock(&s->s_cap_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -0800714 if (s->s_cap_iterator == NULL) {
Sage Weil5dacf092009-12-21 20:40:34 -0800715 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
716 s->s_mds);
717 list_move_tail(&cap->session_caps, &s->s_caps);
718 } else {
719 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
720 &cap->ci->vfs_inode, cap, s->s_mds);
721 }
Sage Weila8599bd2009-10-06 11:31:12 -0700722 spin_unlock(&s->s_cap_lock);
723}
724
725/*
726 * Check if we hold the given mask. If so, move the cap(s) to the
727 * front of their respective LRUs. (This is the preferred way for
728 * callers to check for caps they want.)
729 */
730int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
731{
732 struct ceph_cap *cap;
733 struct rb_node *p;
734 int have = ci->i_snap_caps;
735
736 if ((have & mask) == mask) {
737 dout("__ceph_caps_issued_mask %p snap issued %s"
738 " (mask %s)\n", &ci->vfs_inode,
739 ceph_cap_string(have),
740 ceph_cap_string(mask));
741 return 1;
742 }
743
744 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
745 cap = rb_entry(p, struct ceph_cap, ci_node);
746 if (!__cap_is_valid(cap))
747 continue;
748 if ((cap->issued & mask) == mask) {
749 dout("__ceph_caps_issued_mask %p cap %p issued %s"
750 " (mask %s)\n", &ci->vfs_inode, cap,
751 ceph_cap_string(cap->issued),
752 ceph_cap_string(mask));
753 if (touch)
754 __touch_cap(cap);
755 return 1;
756 }
757
758 /* does a combination of caps satisfy mask? */
759 have |= cap->issued;
760 if ((have & mask) == mask) {
761 dout("__ceph_caps_issued_mask %p combo issued %s"
762 " (mask %s)\n", &ci->vfs_inode,
763 ceph_cap_string(cap->issued),
764 ceph_cap_string(mask));
765 if (touch) {
766 struct rb_node *q;
767
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300768 /* touch this + preceding caps */
Sage Weila8599bd2009-10-06 11:31:12 -0700769 __touch_cap(cap);
770 for (q = rb_first(&ci->i_caps); q != p;
771 q = rb_next(q)) {
772 cap = rb_entry(q, struct ceph_cap,
773 ci_node);
774 if (!__cap_is_valid(cap))
775 continue;
776 __touch_cap(cap);
777 }
778 }
779 return 1;
780 }
781 }
782
783 return 0;
784}
785
786/*
787 * Return true if mask caps are currently being revoked by an MDS.
788 */
789int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
790{
791 struct inode *inode = &ci->vfs_inode;
792 struct ceph_cap *cap;
793 struct rb_node *p;
794 int ret = 0;
795
Sage Weilbe655592011-11-30 09:47:09 -0800796 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700797 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
798 cap = rb_entry(p, struct ceph_cap, ci_node);
799 if (__cap_is_valid(cap) &&
800 (cap->implemented & ~cap->issued & mask)) {
801 ret = 1;
802 break;
803 }
804 }
Sage Weilbe655592011-11-30 09:47:09 -0800805 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700806 dout("ceph_caps_revoking %p %s = %d\n", inode,
807 ceph_cap_string(mask), ret);
808 return ret;
809}
810
811int __ceph_caps_used(struct ceph_inode_info *ci)
812{
813 int used = 0;
814 if (ci->i_pin_ref)
815 used |= CEPH_CAP_PIN;
816 if (ci->i_rd_ref)
817 used |= CEPH_CAP_FILE_RD;
Sage Weila43fb732010-09-17 09:54:08 -0700818 if (ci->i_rdcache_ref || ci->vfs_inode.i_data.nrpages)
Sage Weila8599bd2009-10-06 11:31:12 -0700819 used |= CEPH_CAP_FILE_CACHE;
820 if (ci->i_wr_ref)
821 used |= CEPH_CAP_FILE_WR;
Henry C Changd3d07202011-05-11 10:29:54 +0000822 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
Sage Weila8599bd2009-10-06 11:31:12 -0700823 used |= CEPH_CAP_FILE_BUFFER;
824 return used;
825}
826
827/*
828 * wanted, by virtue of open file modes
829 */
830int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
831{
832 int want = 0;
833 int mode;
Sage Weil33caad32010-05-26 14:31:27 -0700834 for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++)
Sage Weila8599bd2009-10-06 11:31:12 -0700835 if (ci->i_nr_by_mode[mode])
836 want |= ceph_caps_for_mode(mode);
837 return want;
838}
839
840/*
841 * Return caps we have registered with the MDS(s) as 'wanted'.
842 */
843int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
844{
845 struct ceph_cap *cap;
846 struct rb_node *p;
847 int mds_wanted = 0;
848
849 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
850 cap = rb_entry(p, struct ceph_cap, ci_node);
851 if (!__cap_is_valid(cap))
852 continue;
853 mds_wanted |= cap->mds_wanted;
854 }
855 return mds_wanted;
856}
857
858/*
Sage Weilbe655592011-11-30 09:47:09 -0800859 * called under i_ceph_lock
Sage Weila8599bd2009-10-06 11:31:12 -0700860 */
861static int __ceph_is_any_caps(struct ceph_inode_info *ci)
862{
863 return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_mds >= 0;
864}
865
866/*
Sage Weilf818a732010-05-11 20:56:31 -0700867 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
868 *
Sage Weilbe655592011-11-30 09:47:09 -0800869 * caller should hold i_ceph_lock.
Sage Weila6369742010-02-22 13:59:00 -0800870 * caller will not hold session s_mutex if called from destroy_inode.
Sage Weila8599bd2009-10-06 11:31:12 -0700871 */
Sage Weil7c1332b2010-02-16 11:39:45 -0800872void __ceph_remove_cap(struct ceph_cap *cap)
Sage Weila8599bd2009-10-06 11:31:12 -0700873{
874 struct ceph_mds_session *session = cap->session;
875 struct ceph_inode_info *ci = cap->ci;
Cheng Renquan640ef792010-03-26 17:40:33 +0800876 struct ceph_mds_client *mdsc =
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700877 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
Sage Weilf818a732010-05-11 20:56:31 -0700878 int removed = 0;
Sage Weila8599bd2009-10-06 11:31:12 -0700879
880 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
881
Sage Weil7c1332b2010-02-16 11:39:45 -0800882 /* remove from session list */
883 spin_lock(&session->s_cap_lock);
884 if (session->s_cap_iterator == cap) {
885 /* not yet, we are iterating over this very cap */
886 dout("__ceph_remove_cap delaying %p removal from session %p\n",
887 cap, cap->session);
888 } else {
889 list_del_init(&cap->session_caps);
890 session->s_nr_caps--;
891 cap->session = NULL;
Sage Weilf818a732010-05-11 20:56:31 -0700892 removed = 1;
Sage Weil7c1332b2010-02-16 11:39:45 -0800893 }
Sage Weilf818a732010-05-11 20:56:31 -0700894 /* protect backpointer with s_cap_lock: see iterate_session_caps */
895 cap->ci = NULL;
Sage Weil7c1332b2010-02-16 11:39:45 -0800896 spin_unlock(&session->s_cap_lock);
897
Sage Weilf818a732010-05-11 20:56:31 -0700898 /* remove from inode list */
899 rb_erase(&cap->ci_node, &ci->i_caps);
900 if (ci->i_auth_cap == cap)
901 ci->i_auth_cap = NULL;
902
903 if (removed)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700904 ceph_put_cap(mdsc, cap);
Sage Weila8599bd2009-10-06 11:31:12 -0700905
906 if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) {
907 struct ceph_snap_realm *realm = ci->i_snap_realm;
908 spin_lock(&realm->inodes_with_caps_lock);
909 list_del_init(&ci->i_snap_realm_item);
910 ci->i_snap_realm_counter++;
911 ci->i_snap_realm = NULL;
912 spin_unlock(&realm->inodes_with_caps_lock);
913 ceph_put_snap_realm(mdsc, realm);
914 }
915 if (!__ceph_is_any_real_caps(ci))
916 __cap_delay_cancel(mdsc, ci);
917}
918
919/*
920 * Build and send a cap message to the given MDS.
921 *
922 * Caller should be holding s_mutex.
923 */
924static int send_cap_msg(struct ceph_mds_session *session,
925 u64 ino, u64 cid, int op,
926 int caps, int wanted, int dirty,
927 u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq,
928 u64 size, u64 max_size,
929 struct timespec *mtime, struct timespec *atime,
930 u64 time_warp_seq,
Al Viro5706b272011-07-26 04:52:22 -0400931 uid_t uid, gid_t gid, umode_t mode,
Sage Weila8599bd2009-10-06 11:31:12 -0700932 u64 xattr_version,
933 struct ceph_buffer *xattrs_buf,
934 u64 follows)
935{
936 struct ceph_mds_caps *fc;
937 struct ceph_msg *msg;
938
939 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
940 " seq %u/%u mseq %u follows %lld size %llu/%llu"
941 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
942 cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
943 ceph_cap_string(dirty),
944 seq, issue_seq, mseq, follows, size, max_size,
945 xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
946
Sage Weilb61c2762011-08-09 15:03:46 -0700947 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), GFP_NOFS, false);
Sage Weila79832f2010-04-01 16:06:19 -0700948 if (!msg)
949 return -ENOMEM;
Sage Weila8599bd2009-10-06 11:31:12 -0700950
Sage Weil6df058c2009-12-22 11:24:33 -0800951 msg->hdr.tid = cpu_to_le64(flush_tid);
Sage Weila8599bd2009-10-06 11:31:12 -0700952
Sage Weil6df058c2009-12-22 11:24:33 -0800953 fc = msg->front.iov_base;
Sage Weila8599bd2009-10-06 11:31:12 -0700954 memset(fc, 0, sizeof(*fc));
955
956 fc->cap_id = cpu_to_le64(cid);
957 fc->op = cpu_to_le32(op);
958 fc->seq = cpu_to_le32(seq);
Sage Weila8599bd2009-10-06 11:31:12 -0700959 fc->issue_seq = cpu_to_le32(issue_seq);
960 fc->migrate_seq = cpu_to_le32(mseq);
961 fc->caps = cpu_to_le32(caps);
962 fc->wanted = cpu_to_le32(wanted);
963 fc->dirty = cpu_to_le32(dirty);
964 fc->ino = cpu_to_le64(ino);
965 fc->snap_follows = cpu_to_le64(follows);
966
967 fc->size = cpu_to_le64(size);
968 fc->max_size = cpu_to_le64(max_size);
969 if (mtime)
970 ceph_encode_timespec(&fc->mtime, mtime);
971 if (atime)
972 ceph_encode_timespec(&fc->atime, atime);
973 fc->time_warp_seq = cpu_to_le32(time_warp_seq);
974
975 fc->uid = cpu_to_le32(uid);
976 fc->gid = cpu_to_le32(gid);
977 fc->mode = cpu_to_le32(mode);
978
979 fc->xattr_version = cpu_to_le64(xattr_version);
980 if (xattrs_buf) {
981 msg->middle = ceph_buffer_get(xattrs_buf);
982 fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
983 msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
984 }
985
986 ceph_con_send(&session->s_con, msg);
987 return 0;
988}
989
Sage Weil3d7ded42010-06-09 16:47:10 -0700990static void __queue_cap_release(struct ceph_mds_session *session,
991 u64 ino, u64 cap_id, u32 migrate_seq,
992 u32 issue_seq)
993{
994 struct ceph_msg *msg;
995 struct ceph_mds_cap_release *head;
996 struct ceph_mds_cap_item *item;
997
998 spin_lock(&session->s_cap_lock);
999 BUG_ON(!session->s_num_cap_releases);
1000 msg = list_first_entry(&session->s_cap_releases,
1001 struct ceph_msg, list_head);
1002
1003 dout(" adding %llx release to mds%d msg %p (%d left)\n",
1004 ino, session->s_mds, msg, session->s_num_cap_releases);
1005
1006 BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE);
1007 head = msg->front.iov_base;
1008 head->num = cpu_to_le32(le32_to_cpu(head->num) + 1);
1009 item = msg->front.iov_base + msg->front.iov_len;
1010 item->ino = cpu_to_le64(ino);
1011 item->cap_id = cpu_to_le64(cap_id);
1012 item->migrate_seq = cpu_to_le32(migrate_seq);
1013 item->seq = cpu_to_le32(issue_seq);
1014
1015 session->s_num_cap_releases--;
1016
1017 msg->front.iov_len += sizeof(*item);
1018 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1019 dout(" release msg %p full\n", msg);
1020 list_move_tail(&msg->list_head, &session->s_cap_releases_done);
1021 } else {
1022 dout(" release msg %p at %d/%d (%d)\n", msg,
1023 (int)le32_to_cpu(head->num),
1024 (int)CEPH_CAPS_PER_RELEASE,
1025 (int)msg->front.iov_len);
1026 }
1027 spin_unlock(&session->s_cap_lock);
1028}
1029
Sage Weila8599bd2009-10-06 11:31:12 -07001030/*
Sage Weila6369742010-02-22 13:59:00 -08001031 * Queue cap releases when an inode is dropped from our cache. Since
Sage Weilbe655592011-11-30 09:47:09 -08001032 * inode is about to be destroyed, there is no need for i_ceph_lock.
Sage Weila8599bd2009-10-06 11:31:12 -07001033 */
1034void ceph_queue_caps_release(struct inode *inode)
1035{
1036 struct ceph_inode_info *ci = ceph_inode(inode);
1037 struct rb_node *p;
1038
Sage Weila8599bd2009-10-06 11:31:12 -07001039 p = rb_first(&ci->i_caps);
1040 while (p) {
1041 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1042 struct ceph_mds_session *session = cap->session;
Sage Weila8599bd2009-10-06 11:31:12 -07001043
Sage Weil3d7ded42010-06-09 16:47:10 -07001044 __queue_cap_release(session, ceph_ino(inode), cap->cap_id,
1045 cap->mseq, cap->issue_seq);
Sage Weila8599bd2009-10-06 11:31:12 -07001046 p = rb_next(p);
Sage Weil7c1332b2010-02-16 11:39:45 -08001047 __ceph_remove_cap(cap);
Sage Weila8599bd2009-10-06 11:31:12 -07001048 }
Sage Weila8599bd2009-10-06 11:31:12 -07001049}
1050
1051/*
1052 * Send a cap msg on the given inode. Update our caps state, then
Sage Weilbe655592011-11-30 09:47:09 -08001053 * drop i_ceph_lock and send the message.
Sage Weila8599bd2009-10-06 11:31:12 -07001054 *
1055 * Make note of max_size reported/requested from mds, revoked caps
1056 * that have now been implemented.
1057 *
1058 * Make half-hearted attempt ot to invalidate page cache if we are
1059 * dropping RDCACHE. Note that this will leave behind locked pages
1060 * that we'll then need to deal with elsewhere.
1061 *
1062 * Return non-zero if delayed release, or we experienced an error
1063 * such that the caller should requeue + retry later.
1064 *
Sage Weilbe655592011-11-30 09:47:09 -08001065 * called with i_ceph_lock, then drops it.
Sage Weila8599bd2009-10-06 11:31:12 -07001066 * caller should hold snap_rwsem (read), s_mutex.
1067 */
1068static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
1069 int op, int used, int want, int retain, int flushing,
1070 unsigned *pflush_tid)
Sage Weilbe655592011-11-30 09:47:09 -08001071 __releases(cap->ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07001072{
1073 struct ceph_inode_info *ci = cap->ci;
1074 struct inode *inode = &ci->vfs_inode;
1075 u64 cap_id = cap->cap_id;
Sage Weil68c28322010-02-09 13:41:47 -08001076 int held, revoking, dropping, keep;
Sage Weila8599bd2009-10-06 11:31:12 -07001077 u64 seq, issue_seq, mseq, time_warp_seq, follows;
1078 u64 size, max_size;
1079 struct timespec mtime, atime;
1080 int wake = 0;
Al Viro5706b272011-07-26 04:52:22 -04001081 umode_t mode;
Sage Weila8599bd2009-10-06 11:31:12 -07001082 uid_t uid;
1083 gid_t gid;
1084 struct ceph_mds_session *session;
1085 u64 xattr_version = 0;
Sage Weil082afec2010-08-22 15:16:41 -07001086 struct ceph_buffer *xattr_blob = NULL;
Sage Weila8599bd2009-10-06 11:31:12 -07001087 int delayed = 0;
1088 u64 flush_tid = 0;
1089 int i;
1090 int ret;
1091
Sage Weil68c28322010-02-09 13:41:47 -08001092 held = cap->issued | cap->implemented;
1093 revoking = cap->implemented & ~cap->issued;
1094 retain &= ~revoking;
1095 dropping = cap->issued & ~retain;
1096
Sage Weila8599bd2009-10-06 11:31:12 -07001097 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1098 inode, cap, cap->session,
1099 ceph_cap_string(held), ceph_cap_string(held & retain),
1100 ceph_cap_string(revoking));
1101 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1102
1103 session = cap->session;
1104
1105 /* don't release wanted unless we've waited a bit. */
1106 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1107 time_before(jiffies, ci->i_hold_caps_min)) {
1108 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1109 ceph_cap_string(cap->issued),
1110 ceph_cap_string(cap->issued & retain),
1111 ceph_cap_string(cap->mds_wanted),
1112 ceph_cap_string(want));
1113 want |= cap->mds_wanted;
1114 retain |= cap->issued;
1115 delayed = 1;
1116 }
1117 ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
1118
1119 cap->issued &= retain; /* drop bits we don't want */
1120 if (cap->implemented & ~cap->issued) {
1121 /*
1122 * Wake up any waiters on wanted -> needed transition.
1123 * This is due to the weird transition from buffered
1124 * to sync IO... we need to flush dirty pages _before_
1125 * allowing sync writes to avoid reordering.
1126 */
1127 wake = 1;
1128 }
1129 cap->implemented &= cap->issued | used;
1130 cap->mds_wanted = want;
1131
1132 if (flushing) {
1133 /*
1134 * assign a tid for flush operations so we can avoid
1135 * flush1 -> dirty1 -> flush2 -> flushack1 -> mark
1136 * clean type races. track latest tid for every bit
1137 * so we can handle flush AxFw, flush Fw, and have the
1138 * first ack clean Ax.
1139 */
1140 flush_tid = ++ci->i_cap_flush_last_tid;
1141 if (pflush_tid)
1142 *pflush_tid = flush_tid;
1143 dout(" cap_flush_tid %d\n", (int)flush_tid);
1144 for (i = 0; i < CEPH_CAP_BITS; i++)
1145 if (flushing & (1 << i))
1146 ci->i_cap_flush_tid[i] = flush_tid;
Sage Weil7d8cb262010-08-24 08:44:16 -07001147
1148 follows = ci->i_head_snapc->seq;
1149 } else {
1150 follows = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07001151 }
1152
1153 keep = cap->implemented;
1154 seq = cap->seq;
1155 issue_seq = cap->issue_seq;
1156 mseq = cap->mseq;
1157 size = inode->i_size;
1158 ci->i_reported_size = size;
1159 max_size = ci->i_wanted_max_size;
1160 ci->i_requested_max_size = max_size;
1161 mtime = inode->i_mtime;
1162 atime = inode->i_atime;
1163 time_warp_seq = ci->i_time_warp_seq;
Sage Weila8599bd2009-10-06 11:31:12 -07001164 uid = inode->i_uid;
1165 gid = inode->i_gid;
1166 mode = inode->i_mode;
1167
Sage Weil082afec2010-08-22 15:16:41 -07001168 if (flushing & CEPH_CAP_XATTR_EXCL) {
Sage Weila8599bd2009-10-06 11:31:12 -07001169 __ceph_build_xattrs_blob(ci);
Sage Weil082afec2010-08-22 15:16:41 -07001170 xattr_blob = ci->i_xattrs.blob;
1171 xattr_version = ci->i_xattrs.version;
Sage Weila8599bd2009-10-06 11:31:12 -07001172 }
1173
Sage Weilbe655592011-11-30 09:47:09 -08001174 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001175
Sage Weila8599bd2009-10-06 11:31:12 -07001176 ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
1177 op, keep, want, flushing, seq, flush_tid, issue_seq, mseq,
1178 size, max_size, &mtime, &atime, time_warp_seq,
Sage Weil082afec2010-08-22 15:16:41 -07001179 uid, gid, mode, xattr_version, xattr_blob,
Sage Weila8599bd2009-10-06 11:31:12 -07001180 follows);
1181 if (ret < 0) {
1182 dout("error sending cap msg, must requeue %p\n", inode);
1183 delayed = 1;
1184 }
1185
1186 if (wake)
Yehuda Sadeh03066f22010-07-27 13:11:08 -07001187 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07001188
1189 return delayed;
1190}
1191
1192/*
1193 * When a snapshot is taken, clients accumulate dirty metadata on
1194 * inodes with capabilities in ceph_cap_snaps to describe the file
1195 * state at the time the snapshot was taken. This must be flushed
1196 * asynchronously back to the MDS once sync writes complete and dirty
1197 * data is written out.
1198 *
Sage Weile8351242010-09-17 08:03:08 -07001199 * Unless @again is true, skip cap_snaps that were already sent to
1200 * the MDS (i.e., during this session).
1201 *
Sage Weilbe655592011-11-30 09:47:09 -08001202 * Called under i_ceph_lock. Takes s_mutex as needed.
Sage Weila8599bd2009-10-06 11:31:12 -07001203 */
1204void __ceph_flush_snaps(struct ceph_inode_info *ci,
Sage Weile8351242010-09-17 08:03:08 -07001205 struct ceph_mds_session **psession,
1206 int again)
Sage Weilbe655592011-11-30 09:47:09 -08001207 __releases(ci->i_ceph_lock)
1208 __acquires(ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07001209{
1210 struct inode *inode = &ci->vfs_inode;
1211 int mds;
1212 struct ceph_cap_snap *capsnap;
1213 u32 mseq;
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001214 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001215 struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
1216 session->s_mutex */
1217 u64 next_follows = 0; /* keep track of how far we've gotten through the
1218 i_cap_snaps list, and skip these entries next time
1219 around to avoid an infinite loop */
1220
1221 if (psession)
1222 session = *psession;
1223
1224 dout("__flush_snaps %p\n", inode);
1225retry:
1226 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1227 /* avoid an infiniute loop after retry */
1228 if (capsnap->follows < next_follows)
1229 continue;
1230 /*
1231 * we need to wait for sync writes to complete and for dirty
1232 * pages to be written out.
1233 */
1234 if (capsnap->dirty_pages || capsnap->writing)
Sage Weilcfc0bf62010-09-14 15:50:59 -07001235 break;
Sage Weila8599bd2009-10-06 11:31:12 -07001236
Sage Weil819ccbf2010-04-01 09:33:46 -07001237 /*
1238 * if cap writeback already occurred, we should have dropped
1239 * the capsnap in ceph_put_wrbuffer_cap_refs.
1240 */
1241 BUG_ON(capsnap->dirty == 0);
1242
Sage Weila8599bd2009-10-06 11:31:12 -07001243 /* pick mds, take s_mutex */
Sage Weilca81f3f2010-06-10 14:21:36 -07001244 if (ci->i_auth_cap == NULL) {
1245 dout("no auth cap (migrating?), doing nothing\n");
1246 goto out;
1247 }
Sage Weile8351242010-09-17 08:03:08 -07001248
1249 /* only flush each capsnap once */
1250 if (!again && !list_empty(&capsnap->flushing_item)) {
1251 dout("already flushed %p, skipping\n", capsnap);
1252 continue;
1253 }
1254
Sage Weilca81f3f2010-06-10 14:21:36 -07001255 mds = ci->i_auth_cap->session->s_mds;
1256 mseq = ci->i_auth_cap->mseq;
1257
Sage Weila8599bd2009-10-06 11:31:12 -07001258 if (session && session->s_mds != mds) {
1259 dout("oops, wrong session %p mutex\n", session);
1260 mutex_unlock(&session->s_mutex);
1261 ceph_put_mds_session(session);
1262 session = NULL;
1263 }
1264 if (!session) {
Sage Weilbe655592011-11-30 09:47:09 -08001265 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001266 mutex_lock(&mdsc->mutex);
1267 session = __ceph_lookup_mds_session(mdsc, mds);
1268 mutex_unlock(&mdsc->mutex);
1269 if (session) {
1270 dout("inverting session/ino locks on %p\n",
1271 session);
1272 mutex_lock(&session->s_mutex);
1273 }
1274 /*
1275 * if session == NULL, we raced against a cap
Sage Weilca81f3f2010-06-10 14:21:36 -07001276 * deletion or migration. retry, and we'll
1277 * get a better @mds value next time.
Sage Weila8599bd2009-10-06 11:31:12 -07001278 */
Sage Weilbe655592011-11-30 09:47:09 -08001279 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001280 goto retry;
1281 }
1282
1283 capsnap->flush_tid = ++ci->i_cap_flush_last_tid;
1284 atomic_inc(&capsnap->nref);
1285 if (!list_empty(&capsnap->flushing_item))
1286 list_del_init(&capsnap->flushing_item);
1287 list_add_tail(&capsnap->flushing_item,
1288 &session->s_cap_snaps_flushing);
Sage Weilbe655592011-11-30 09:47:09 -08001289 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001290
Sage Weilcfc0bf62010-09-14 15:50:59 -07001291 dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
1292 inode, capsnap, capsnap->follows, capsnap->flush_tid);
Sage Weila8599bd2009-10-06 11:31:12 -07001293 send_cap_msg(session, ceph_vino(inode).ino, 0,
1294 CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
1295 capsnap->dirty, 0, capsnap->flush_tid, 0, mseq,
1296 capsnap->size, 0,
1297 &capsnap->mtime, &capsnap->atime,
1298 capsnap->time_warp_seq,
1299 capsnap->uid, capsnap->gid, capsnap->mode,
Sage Weil4a625be2010-08-22 15:03:56 -07001300 capsnap->xattr_version, capsnap->xattr_blob,
Sage Weila8599bd2009-10-06 11:31:12 -07001301 capsnap->follows);
1302
1303 next_follows = capsnap->follows + 1;
1304 ceph_put_cap_snap(capsnap);
1305
Sage Weilbe655592011-11-30 09:47:09 -08001306 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001307 goto retry;
1308 }
1309
1310 /* we flushed them all; remove this inode from the queue */
1311 spin_lock(&mdsc->snap_flush_lock);
1312 list_del_init(&ci->i_snap_flush_item);
1313 spin_unlock(&mdsc->snap_flush_lock);
1314
Sage Weilca81f3f2010-06-10 14:21:36 -07001315out:
Sage Weila8599bd2009-10-06 11:31:12 -07001316 if (psession)
1317 *psession = session;
1318 else if (session) {
1319 mutex_unlock(&session->s_mutex);
1320 ceph_put_mds_session(session);
1321 }
1322}
1323
1324static void ceph_flush_snaps(struct ceph_inode_info *ci)
1325{
Sage Weilbe655592011-11-30 09:47:09 -08001326 spin_lock(&ci->i_ceph_lock);
Sage Weile8351242010-09-17 08:03:08 -07001327 __ceph_flush_snaps(ci, NULL, 0);
Sage Weilbe655592011-11-30 09:47:09 -08001328 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001329}
1330
1331/*
Sage Weilfca65b42011-05-04 11:33:47 -07001332 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1333 * Caller is then responsible for calling __mark_inode_dirty with the
1334 * returned flags value.
Sage Weil76e3b392009-10-15 18:13:53 -07001335 */
Sage Weilfca65b42011-05-04 11:33:47 -07001336int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask)
Sage Weil76e3b392009-10-15 18:13:53 -07001337{
Cheng Renquan640ef792010-03-26 17:40:33 +08001338 struct ceph_mds_client *mdsc =
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001339 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
Sage Weil76e3b392009-10-15 18:13:53 -07001340 struct inode *inode = &ci->vfs_inode;
1341 int was = ci->i_dirty_caps;
1342 int dirty = 0;
1343
1344 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1345 ceph_cap_string(mask), ceph_cap_string(was),
1346 ceph_cap_string(was | mask));
1347 ci->i_dirty_caps |= mask;
1348 if (was == 0) {
Sage Weil7d8cb262010-08-24 08:44:16 -07001349 if (!ci->i_head_snapc)
1350 ci->i_head_snapc = ceph_get_snap_context(
1351 ci->i_snap_realm->cached_context);
1352 dout(" inode %p now dirty snapc %p\n", &ci->vfs_inode,
1353 ci->i_head_snapc);
Sage Weil76e3b392009-10-15 18:13:53 -07001354 BUG_ON(!list_empty(&ci->i_dirty_item));
1355 spin_lock(&mdsc->cap_dirty_lock);
1356 list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
1357 spin_unlock(&mdsc->cap_dirty_lock);
1358 if (ci->i_flushing_caps == 0) {
Sage Weil3772d262011-05-03 09:28:08 -07001359 ihold(inode);
Sage Weil76e3b392009-10-15 18:13:53 -07001360 dirty |= I_DIRTY_SYNC;
1361 }
1362 }
1363 BUG_ON(list_empty(&ci->i_dirty_item));
1364 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1365 (mask & CEPH_CAP_FILE_BUFFER))
1366 dirty |= I_DIRTY_DATASYNC;
Sage Weil76e3b392009-10-15 18:13:53 -07001367 __cap_delay_requeue(mdsc, ci);
Sage Weilfca65b42011-05-04 11:33:47 -07001368 return dirty;
Sage Weil76e3b392009-10-15 18:13:53 -07001369}
1370
1371/*
Sage Weila8599bd2009-10-06 11:31:12 -07001372 * Add dirty inode to the flushing list. Assigned a seq number so we
1373 * can wait for caps to flush without starving.
Sage Weilcdc35f92009-10-14 14:24:19 -07001374 *
Sage Weilbe655592011-11-30 09:47:09 -08001375 * Called under i_ceph_lock.
Sage Weila8599bd2009-10-06 11:31:12 -07001376 */
Sage Weilcdc35f92009-10-14 14:24:19 -07001377static int __mark_caps_flushing(struct inode *inode,
Sage Weila8599bd2009-10-06 11:31:12 -07001378 struct ceph_mds_session *session)
1379{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001380 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001381 struct ceph_inode_info *ci = ceph_inode(inode);
Sage Weilcdc35f92009-10-14 14:24:19 -07001382 int flushing;
Sage Weil50b885b2009-12-01 14:12:07 -08001383
Sage Weilcdc35f92009-10-14 14:24:19 -07001384 BUG_ON(ci->i_dirty_caps == 0);
Sage Weila8599bd2009-10-06 11:31:12 -07001385 BUG_ON(list_empty(&ci->i_dirty_item));
Sage Weilcdc35f92009-10-14 14:24:19 -07001386
1387 flushing = ci->i_dirty_caps;
1388 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1389 ceph_cap_string(flushing),
1390 ceph_cap_string(ci->i_flushing_caps),
1391 ceph_cap_string(ci->i_flushing_caps | flushing));
1392 ci->i_flushing_caps |= flushing;
1393 ci->i_dirty_caps = 0;
Sage Weilafcdaea2009-10-14 14:27:38 -07001394 dout(" inode %p now !dirty\n", inode);
Sage Weilcdc35f92009-10-14 14:24:19 -07001395
Sage Weila8599bd2009-10-06 11:31:12 -07001396 spin_lock(&mdsc->cap_dirty_lock);
Sage Weilafcdaea2009-10-14 14:27:38 -07001397 list_del_init(&ci->i_dirty_item);
1398
1399 ci->i_cap_flush_seq = ++mdsc->cap_flush_seq;
Sage Weila8599bd2009-10-06 11:31:12 -07001400 if (list_empty(&ci->i_flushing_item)) {
1401 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1402 mdsc->num_cap_flushing++;
Sage Weilafcdaea2009-10-14 14:27:38 -07001403 dout(" inode %p now flushing seq %lld\n", inode,
1404 ci->i_cap_flush_seq);
1405 } else {
1406 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1407 dout(" inode %p now flushing (more) seq %lld\n", inode,
Sage Weila8599bd2009-10-06 11:31:12 -07001408 ci->i_cap_flush_seq);
1409 }
1410 spin_unlock(&mdsc->cap_dirty_lock);
Sage Weilcdc35f92009-10-14 14:24:19 -07001411
1412 return flushing;
Sage Weila8599bd2009-10-06 11:31:12 -07001413}
1414
1415/*
Sage Weil5ecad6f2010-02-17 10:43:37 -08001416 * try to invalidate mapping pages without blocking.
1417 */
Sage Weil5ecad6f2010-02-17 10:43:37 -08001418static int try_nonblocking_invalidate(struct inode *inode)
1419{
1420 struct ceph_inode_info *ci = ceph_inode(inode);
1421 u32 invalidating_gen = ci->i_rdcache_gen;
1422
Sage Weilbe655592011-11-30 09:47:09 -08001423 spin_unlock(&ci->i_ceph_lock);
Sage Weil5ecad6f2010-02-17 10:43:37 -08001424 invalidate_mapping_pages(&inode->i_data, 0, -1);
Sage Weilbe655592011-11-30 09:47:09 -08001425 spin_lock(&ci->i_ceph_lock);
Sage Weil5ecad6f2010-02-17 10:43:37 -08001426
Sage Weil18a38192010-09-17 10:46:44 -07001427 if (inode->i_data.nrpages == 0 &&
Sage Weil5ecad6f2010-02-17 10:43:37 -08001428 invalidating_gen == ci->i_rdcache_gen) {
1429 /* success. */
1430 dout("try_nonblocking_invalidate %p success\n", inode);
Sage Weilcd045cb2010-11-04 11:05:05 -07001431 /* save any racing async invalidate some trouble */
1432 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
Sage Weil5ecad6f2010-02-17 10:43:37 -08001433 return 0;
1434 }
1435 dout("try_nonblocking_invalidate %p failed\n", inode);
1436 return -1;
1437}
1438
1439/*
Sage Weila8599bd2009-10-06 11:31:12 -07001440 * Swiss army knife function to examine currently used and wanted
1441 * versus held caps. Release, flush, ack revoked caps to mds as
1442 * appropriate.
1443 *
1444 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1445 * cap release further.
1446 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1447 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1448 * further delay.
1449 */
1450void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1451 struct ceph_mds_session *session)
1452{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001453 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1454 struct ceph_mds_client *mdsc = fsc->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001455 struct inode *inode = &ci->vfs_inode;
1456 struct ceph_cap *cap;
1457 int file_wanted, used;
1458 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
Sage Weilcbd03632010-02-09 13:41:18 -08001459 int issued, implemented, want, retain, revoking, flushing = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07001460 int mds = -1; /* keep track of how far we've gone through i_caps list
1461 to avoid an infinite loop on retry */
1462 struct rb_node *p;
1463 int tried_invalidate = 0;
1464 int delayed = 0, sent = 0, force_requeue = 0, num;
Sage Weilcbd03632010-02-09 13:41:18 -08001465 int queue_invalidate = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07001466 int is_delayed = flags & CHECK_CAPS_NODELAY;
1467
1468 /* if we are unmounting, flush any unused caps immediately. */
1469 if (mdsc->stopping)
1470 is_delayed = 1;
1471
Sage Weilbe655592011-11-30 09:47:09 -08001472 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001473
1474 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1475 flags |= CHECK_CAPS_FLUSH;
1476
1477 /* flush snaps first time around only */
1478 if (!list_empty(&ci->i_cap_snaps))
Sage Weile8351242010-09-17 08:03:08 -07001479 __ceph_flush_snaps(ci, &session, 0);
Sage Weila8599bd2009-10-06 11:31:12 -07001480 goto retry_locked;
1481retry:
Sage Weilbe655592011-11-30 09:47:09 -08001482 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001483retry_locked:
1484 file_wanted = __ceph_caps_file_wanted(ci);
1485 used = __ceph_caps_used(ci);
1486 want = file_wanted | used;
Sage Weilcbd03632010-02-09 13:41:18 -08001487 issued = __ceph_caps_issued(ci, &implemented);
1488 revoking = implemented & ~issued;
Sage Weila8599bd2009-10-06 11:31:12 -07001489
1490 retain = want | CEPH_CAP_PIN;
1491 if (!mdsc->stopping && inode->i_nlink > 0) {
1492 if (want) {
1493 retain |= CEPH_CAP_ANY; /* be greedy */
1494 } else {
1495 retain |= CEPH_CAP_ANY_SHARED;
1496 /*
1497 * keep RD only if we didn't have the file open RW,
1498 * because then the mds would revoke it anyway to
1499 * journal max_size=0.
1500 */
1501 if (ci->i_max_size == 0)
1502 retain |= CEPH_CAP_ANY_RD;
1503 }
1504 }
1505
1506 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
Sage Weilcbd03632010-02-09 13:41:18 -08001507 " issued %s revoking %s retain %s %s%s%s\n", inode,
Sage Weila8599bd2009-10-06 11:31:12 -07001508 ceph_cap_string(file_wanted),
1509 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1510 ceph_cap_string(ci->i_flushing_caps),
Sage Weilcbd03632010-02-09 13:41:18 -08001511 ceph_cap_string(issued), ceph_cap_string(revoking),
Sage Weila8599bd2009-10-06 11:31:12 -07001512 ceph_cap_string(retain),
1513 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1514 (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
1515 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1516
1517 /*
1518 * If we no longer need to hold onto old our caps, and we may
1519 * have cached pages, but don't want them, then try to invalidate.
1520 * If we fail, it's because pages are locked.... try again later.
1521 */
1522 if ((!is_delayed || mdsc->stopping) &&
1523 ci->i_wrbuffer_ref == 0 && /* no dirty pages... */
Sage Weil93afd442010-09-17 08:38:25 -07001524 inode->i_data.nrpages && /* have cached pages */
Sage Weilcbd03632010-02-09 13:41:18 -08001525 (file_wanted == 0 || /* no open files */
Sage Weil29625072010-05-27 10:40:43 -07001526 (revoking & (CEPH_CAP_FILE_CACHE|
1527 CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */
Sage Weila8599bd2009-10-06 11:31:12 -07001528 !tried_invalidate) {
Sage Weila8599bd2009-10-06 11:31:12 -07001529 dout("check_caps trying to invalidate on %p\n", inode);
Sage Weil5ecad6f2010-02-17 10:43:37 -08001530 if (try_nonblocking_invalidate(inode) < 0) {
Sage Weil29625072010-05-27 10:40:43 -07001531 if (revoking & (CEPH_CAP_FILE_CACHE|
1532 CEPH_CAP_FILE_LAZYIO)) {
Sage Weil5ecad6f2010-02-17 10:43:37 -08001533 dout("check_caps queuing invalidate\n");
1534 queue_invalidate = 1;
1535 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1536 } else {
1537 dout("check_caps failed to invalidate pages\n");
1538 /* we failed to invalidate pages. check these
1539 caps again later. */
1540 force_requeue = 1;
1541 __cap_set_timeouts(mdsc, ci);
1542 }
Sage Weila8599bd2009-10-06 11:31:12 -07001543 }
1544 tried_invalidate = 1;
1545 goto retry_locked;
1546 }
1547
1548 num = 0;
1549 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1550 cap = rb_entry(p, struct ceph_cap, ci_node);
1551 num++;
1552
1553 /* avoid looping forever */
1554 if (mds >= cap->mds ||
1555 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
1556 continue;
1557
1558 /* NOTE: no side-effects allowed, until we take s_mutex */
1559
1560 revoking = cap->implemented & ~cap->issued;
Sage Weil088b3f52011-01-18 08:56:01 -08001561 dout(" mds%d cap %p issued %s implemented %s revoking %s\n",
1562 cap->mds, cap, ceph_cap_string(cap->issued),
1563 ceph_cap_string(cap->implemented),
1564 ceph_cap_string(revoking));
Sage Weila8599bd2009-10-06 11:31:12 -07001565
1566 if (cap == ci->i_auth_cap &&
1567 (cap->issued & CEPH_CAP_FILE_WR)) {
1568 /* request larger max_size from MDS? */
1569 if (ci->i_wanted_max_size > ci->i_max_size &&
1570 ci->i_wanted_max_size > ci->i_requested_max_size) {
1571 dout("requesting new max_size\n");
1572 goto ack;
1573 }
1574
1575 /* approaching file_max? */
1576 if ((inode->i_size << 1) >= ci->i_max_size &&
1577 (ci->i_reported_size << 1) < ci->i_max_size) {
1578 dout("i_size approaching max_size\n");
1579 goto ack;
1580 }
1581 }
1582 /* flush anything dirty? */
1583 if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
1584 ci->i_dirty_caps) {
1585 dout("flushing dirty caps\n");
1586 goto ack;
1587 }
1588
1589 /* completed revocation? going down and there are no caps? */
1590 if (revoking && (revoking & used) == 0) {
1591 dout("completed revocation of %s\n",
1592 ceph_cap_string(cap->implemented & ~cap->issued));
1593 goto ack;
1594 }
1595
1596 /* want more caps from mds? */
1597 if (want & ~(cap->mds_wanted | cap->issued))
1598 goto ack;
1599
1600 /* things we might delay */
1601 if ((cap->issued & ~retain) == 0 &&
1602 cap->mds_wanted == want)
1603 continue; /* nope, all good */
1604
1605 if (is_delayed)
1606 goto ack;
1607
1608 /* delay? */
1609 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1610 time_before(jiffies, ci->i_hold_caps_max)) {
1611 dout(" delaying issued %s -> %s, wanted %s -> %s\n",
1612 ceph_cap_string(cap->issued),
1613 ceph_cap_string(cap->issued & retain),
1614 ceph_cap_string(cap->mds_wanted),
1615 ceph_cap_string(want));
1616 delayed++;
1617 continue;
1618 }
1619
1620ack:
Sage Weile9964c12010-03-01 15:16:56 -08001621 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1622 dout(" skipping %p I_NOFLUSH set\n", inode);
1623 continue;
1624 }
1625
Sage Weila8599bd2009-10-06 11:31:12 -07001626 if (session && session != cap->session) {
1627 dout("oops, wrong session %p mutex\n", session);
1628 mutex_unlock(&session->s_mutex);
1629 session = NULL;
1630 }
1631 if (!session) {
1632 session = cap->session;
1633 if (mutex_trylock(&session->s_mutex) == 0) {
1634 dout("inverting session/ino locks on %p\n",
1635 session);
Sage Weilbe655592011-11-30 09:47:09 -08001636 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001637 if (took_snap_rwsem) {
1638 up_read(&mdsc->snap_rwsem);
1639 took_snap_rwsem = 0;
1640 }
1641 mutex_lock(&session->s_mutex);
1642 goto retry;
1643 }
1644 }
1645 /* take snap_rwsem after session mutex */
1646 if (!took_snap_rwsem) {
1647 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
1648 dout("inverting snap/in locks on %p\n",
1649 inode);
Sage Weilbe655592011-11-30 09:47:09 -08001650 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001651 down_read(&mdsc->snap_rwsem);
1652 took_snap_rwsem = 1;
1653 goto retry;
1654 }
1655 took_snap_rwsem = 1;
1656 }
1657
Sage Weilcdc35f92009-10-14 14:24:19 -07001658 if (cap == ci->i_auth_cap && ci->i_dirty_caps)
1659 flushing = __mark_caps_flushing(inode, session);
Sage Weil24be0c42011-01-18 08:48:06 -08001660 else
1661 flushing = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07001662
1663 mds = cap->mds; /* remember mds, so we don't repeat */
1664 sent++;
1665
Sage Weilbe655592011-11-30 09:47:09 -08001666 /* __send_cap drops i_ceph_lock */
Sage Weila8599bd2009-10-06 11:31:12 -07001667 delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, used, want,
1668 retain, flushing, NULL);
Sage Weilbe655592011-11-30 09:47:09 -08001669 goto retry; /* retake i_ceph_lock and restart our cap scan. */
Sage Weila8599bd2009-10-06 11:31:12 -07001670 }
1671
1672 /*
1673 * Reschedule delayed caps release if we delayed anything,
1674 * otherwise cancel.
1675 */
1676 if (delayed && is_delayed)
1677 force_requeue = 1; /* __send_cap delayed release; requeue */
1678 if (!delayed && !is_delayed)
1679 __cap_delay_cancel(mdsc, ci);
1680 else if (!is_delayed || force_requeue)
1681 __cap_delay_requeue(mdsc, ci);
1682
Sage Weilbe655592011-11-30 09:47:09 -08001683 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001684
Sage Weilcbd03632010-02-09 13:41:18 -08001685 if (queue_invalidate)
Sage Weil3c6f6b72010-02-09 15:24:44 -08001686 ceph_queue_invalidate(inode);
Sage Weilcbd03632010-02-09 13:41:18 -08001687
Sage Weilcdc2ce02010-03-16 13:39:28 -07001688 if (session)
Sage Weila8599bd2009-10-06 11:31:12 -07001689 mutex_unlock(&session->s_mutex);
1690 if (took_snap_rwsem)
1691 up_read(&mdsc->snap_rwsem);
1692}
1693
1694/*
Sage Weila8599bd2009-10-06 11:31:12 -07001695 * Try to flush dirty caps back to the auth mds.
1696 */
1697static int try_flush_caps(struct inode *inode, struct ceph_mds_session *session,
1698 unsigned *flush_tid)
1699{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001700 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001701 struct ceph_inode_info *ci = ceph_inode(inode);
1702 int unlock_session = session ? 0 : 1;
1703 int flushing = 0;
1704
1705retry:
Sage Weilbe655592011-11-30 09:47:09 -08001706 spin_lock(&ci->i_ceph_lock);
Sage Weile9964c12010-03-01 15:16:56 -08001707 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1708 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
1709 goto out;
1710 }
Sage Weila8599bd2009-10-06 11:31:12 -07001711 if (ci->i_dirty_caps && ci->i_auth_cap) {
1712 struct ceph_cap *cap = ci->i_auth_cap;
1713 int used = __ceph_caps_used(ci);
1714 int want = __ceph_caps_wanted(ci);
1715 int delayed;
1716
1717 if (!session) {
Sage Weilbe655592011-11-30 09:47:09 -08001718 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001719 session = cap->session;
1720 mutex_lock(&session->s_mutex);
1721 goto retry;
1722 }
1723 BUG_ON(session != cap->session);
1724 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
1725 goto out;
1726
Sage Weilcdc35f92009-10-14 14:24:19 -07001727 flushing = __mark_caps_flushing(inode, session);
Sage Weila8599bd2009-10-06 11:31:12 -07001728
Sage Weilbe655592011-11-30 09:47:09 -08001729 /* __send_cap drops i_ceph_lock */
Sage Weila8599bd2009-10-06 11:31:12 -07001730 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
1731 cap->issued | cap->implemented, flushing,
1732 flush_tid);
1733 if (!delayed)
1734 goto out_unlocked;
1735
Sage Weilbe655592011-11-30 09:47:09 -08001736 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001737 __cap_delay_requeue(mdsc, ci);
1738 }
1739out:
Sage Weilbe655592011-11-30 09:47:09 -08001740 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001741out_unlocked:
1742 if (session && unlock_session)
1743 mutex_unlock(&session->s_mutex);
1744 return flushing;
1745}
1746
1747/*
1748 * Return true if we've flushed caps through the given flush_tid.
1749 */
1750static int caps_are_flushed(struct inode *inode, unsigned tid)
1751{
1752 struct ceph_inode_info *ci = ceph_inode(inode);
Dan Carpentera5ee7512010-05-07 10:27:14 +02001753 int i, ret = 1;
Sage Weila8599bd2009-10-06 11:31:12 -07001754
Sage Weilbe655592011-11-30 09:47:09 -08001755 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001756 for (i = 0; i < CEPH_CAP_BITS; i++)
1757 if ((ci->i_flushing_caps & (1 << i)) &&
1758 ci->i_cap_flush_tid[i] <= tid) {
1759 /* still flushing this bit */
1760 ret = 0;
1761 break;
1762 }
Sage Weilbe655592011-11-30 09:47:09 -08001763 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001764 return ret;
1765}
1766
1767/*
1768 * Wait on any unsafe replies for the given inode. First wait on the
1769 * newest request, and make that the upper bound. Then, if there are
1770 * more requests, keep waiting on the oldest as long as it is still older
1771 * than the original request.
1772 */
1773static void sync_write_wait(struct inode *inode)
1774{
1775 struct ceph_inode_info *ci = ceph_inode(inode);
1776 struct list_head *head = &ci->i_unsafe_writes;
1777 struct ceph_osd_request *req;
1778 u64 last_tid;
1779
1780 spin_lock(&ci->i_unsafe_lock);
1781 if (list_empty(head))
1782 goto out;
1783
1784 /* set upper bound as _last_ entry in chain */
1785 req = list_entry(head->prev, struct ceph_osd_request,
1786 r_unsafe_item);
1787 last_tid = req->r_tid;
1788
1789 do {
1790 ceph_osdc_get_request(req);
1791 spin_unlock(&ci->i_unsafe_lock);
1792 dout("sync_write_wait on tid %llu (until %llu)\n",
1793 req->r_tid, last_tid);
1794 wait_for_completion(&req->r_safe_completion);
1795 spin_lock(&ci->i_unsafe_lock);
1796 ceph_osdc_put_request(req);
1797
1798 /*
1799 * from here on look at first entry in chain, since we
1800 * only want to wait for anything older than last_tid
1801 */
1802 if (list_empty(head))
1803 break;
1804 req = list_entry(head->next, struct ceph_osd_request,
1805 r_unsafe_item);
1806 } while (req->r_tid < last_tid);
1807out:
1808 spin_unlock(&ci->i_unsafe_lock);
1809}
1810
Josef Bacik02c24a82011-07-16 20:44:56 -04001811int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
Sage Weila8599bd2009-10-06 11:31:12 -07001812{
Christoph Hellwig7ea80852010-05-26 17:53:25 +02001813 struct inode *inode = file->f_mapping->host;
Sage Weila8599bd2009-10-06 11:31:12 -07001814 struct ceph_inode_info *ci = ceph_inode(inode);
1815 unsigned flush_tid;
1816 int ret;
1817 int dirty;
1818
1819 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
1820 sync_write_wait(inode);
1821
Josef Bacik02c24a82011-07-16 20:44:56 -04001822 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
Sage Weila8599bd2009-10-06 11:31:12 -07001823 if (ret < 0)
1824 return ret;
Josef Bacik02c24a82011-07-16 20:44:56 -04001825 mutex_lock(&inode->i_mutex);
Sage Weila8599bd2009-10-06 11:31:12 -07001826
1827 dirty = try_flush_caps(inode, NULL, &flush_tid);
1828 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
1829
1830 /*
1831 * only wait on non-file metadata writeback (the mds
1832 * can recover size and mtime, so we don't need to
1833 * wait for that)
1834 */
1835 if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
1836 dout("fsync waiting for flush_tid %u\n", flush_tid);
1837 ret = wait_event_interruptible(ci->i_cap_wq,
1838 caps_are_flushed(inode, flush_tid));
1839 }
1840
1841 dout("fsync %p%s done\n", inode, datasync ? " datasync" : "");
Josef Bacik02c24a82011-07-16 20:44:56 -04001842 mutex_unlock(&inode->i_mutex);
Sage Weila8599bd2009-10-06 11:31:12 -07001843 return ret;
1844}
1845
1846/*
1847 * Flush any dirty caps back to the mds. If we aren't asked to wait,
1848 * queue inode for flush but don't do so immediately, because we can
1849 * get by with fewer MDS messages if we wait for data writeback to
1850 * complete first.
1851 */
Stephen Rothwellf1a3d572010-01-18 11:53:08 +11001852int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
Sage Weila8599bd2009-10-06 11:31:12 -07001853{
1854 struct ceph_inode_info *ci = ceph_inode(inode);
1855 unsigned flush_tid;
1856 int err = 0;
1857 int dirty;
Stephen Rothwellf1a3d572010-01-18 11:53:08 +11001858 int wait = wbc->sync_mode == WB_SYNC_ALL;
Sage Weila8599bd2009-10-06 11:31:12 -07001859
1860 dout("write_inode %p wait=%d\n", inode, wait);
1861 if (wait) {
1862 dirty = try_flush_caps(inode, NULL, &flush_tid);
1863 if (dirty)
1864 err = wait_event_interruptible(ci->i_cap_wq,
1865 caps_are_flushed(inode, flush_tid));
1866 } else {
Cheng Renquan640ef792010-03-26 17:40:33 +08001867 struct ceph_mds_client *mdsc =
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001868 ceph_sb_to_client(inode->i_sb)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001869
Sage Weilbe655592011-11-30 09:47:09 -08001870 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001871 if (__ceph_caps_dirty(ci))
1872 __cap_delay_requeue_front(mdsc, ci);
Sage Weilbe655592011-11-30 09:47:09 -08001873 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001874 }
1875 return err;
1876}
1877
1878/*
1879 * After a recovering MDS goes active, we need to resend any caps
1880 * we were flushing.
1881 *
1882 * Caller holds session->s_mutex.
1883 */
1884static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc,
1885 struct ceph_mds_session *session)
1886{
1887 struct ceph_cap_snap *capsnap;
1888
1889 dout("kick_flushing_capsnaps mds%d\n", session->s_mds);
1890 list_for_each_entry(capsnap, &session->s_cap_snaps_flushing,
1891 flushing_item) {
1892 struct ceph_inode_info *ci = capsnap->ci;
1893 struct inode *inode = &ci->vfs_inode;
1894 struct ceph_cap *cap;
1895
Sage Weilbe655592011-11-30 09:47:09 -08001896 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001897 cap = ci->i_auth_cap;
1898 if (cap && cap->session == session) {
1899 dout("kick_flushing_caps %p cap %p capsnap %p\n", inode,
1900 cap, capsnap);
Sage Weile8351242010-09-17 08:03:08 -07001901 __ceph_flush_snaps(ci, &session, 1);
Sage Weila8599bd2009-10-06 11:31:12 -07001902 } else {
1903 pr_err("%p auth cap %p not mds%d ???\n", inode,
1904 cap, session->s_mds);
Sage Weila8599bd2009-10-06 11:31:12 -07001905 }
Sage Weilbe655592011-11-30 09:47:09 -08001906 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001907 }
1908}
1909
1910void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
1911 struct ceph_mds_session *session)
1912{
1913 struct ceph_inode_info *ci;
1914
1915 kick_flushing_capsnaps(mdsc, session);
1916
1917 dout("kick_flushing_caps mds%d\n", session->s_mds);
1918 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
1919 struct inode *inode = &ci->vfs_inode;
1920 struct ceph_cap *cap;
1921 int delayed = 0;
1922
Sage Weilbe655592011-11-30 09:47:09 -08001923 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001924 cap = ci->i_auth_cap;
1925 if (cap && cap->session == session) {
1926 dout("kick_flushing_caps %p cap %p %s\n", inode,
1927 cap, ceph_cap_string(ci->i_flushing_caps));
1928 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1929 __ceph_caps_used(ci),
1930 __ceph_caps_wanted(ci),
1931 cap->issued | cap->implemented,
1932 ci->i_flushing_caps, NULL);
1933 if (delayed) {
Sage Weilbe655592011-11-30 09:47:09 -08001934 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001935 __cap_delay_requeue(mdsc, ci);
Sage Weilbe655592011-11-30 09:47:09 -08001936 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001937 }
1938 } else {
1939 pr_err("%p auth cap %p not mds%d ???\n", inode,
1940 cap, session->s_mds);
Sage Weilbe655592011-11-30 09:47:09 -08001941 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001942 }
1943 }
1944}
1945
Sage Weil088b3f52011-01-18 08:56:01 -08001946static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
1947 struct ceph_mds_session *session,
1948 struct inode *inode)
1949{
1950 struct ceph_inode_info *ci = ceph_inode(inode);
1951 struct ceph_cap *cap;
1952 int delayed = 0;
1953
Sage Weilbe655592011-11-30 09:47:09 -08001954 spin_lock(&ci->i_ceph_lock);
Sage Weil088b3f52011-01-18 08:56:01 -08001955 cap = ci->i_auth_cap;
1956 dout("kick_flushing_inode_caps %p flushing %s flush_seq %lld\n", inode,
1957 ceph_cap_string(ci->i_flushing_caps), ci->i_cap_flush_seq);
1958 __ceph_flush_snaps(ci, &session, 1);
1959 if (ci->i_flushing_caps) {
1960 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1961 __ceph_caps_used(ci),
1962 __ceph_caps_wanted(ci),
1963 cap->issued | cap->implemented,
1964 ci->i_flushing_caps, NULL);
1965 if (delayed) {
Sage Weilbe655592011-11-30 09:47:09 -08001966 spin_lock(&ci->i_ceph_lock);
Sage Weil088b3f52011-01-18 08:56:01 -08001967 __cap_delay_requeue(mdsc, ci);
Sage Weilbe655592011-11-30 09:47:09 -08001968 spin_unlock(&ci->i_ceph_lock);
Sage Weil088b3f52011-01-18 08:56:01 -08001969 }
1970 } else {
Sage Weilbe655592011-11-30 09:47:09 -08001971 spin_unlock(&ci->i_ceph_lock);
Sage Weil088b3f52011-01-18 08:56:01 -08001972 }
1973}
1974
Sage Weila8599bd2009-10-06 11:31:12 -07001975
1976/*
1977 * Take references to capabilities we hold, so that we don't release
1978 * them to the MDS prematurely.
1979 *
Sage Weilbe655592011-11-30 09:47:09 -08001980 * Protected by i_ceph_lock.
Sage Weila8599bd2009-10-06 11:31:12 -07001981 */
1982static void __take_cap_refs(struct ceph_inode_info *ci, int got)
1983{
1984 if (got & CEPH_CAP_PIN)
1985 ci->i_pin_ref++;
1986 if (got & CEPH_CAP_FILE_RD)
1987 ci->i_rd_ref++;
1988 if (got & CEPH_CAP_FILE_CACHE)
1989 ci->i_rdcache_ref++;
1990 if (got & CEPH_CAP_FILE_WR)
1991 ci->i_wr_ref++;
1992 if (got & CEPH_CAP_FILE_BUFFER) {
Henry C Changd3d07202011-05-11 10:29:54 +00001993 if (ci->i_wb_ref == 0)
Sage Weil3772d262011-05-03 09:28:08 -07001994 ihold(&ci->vfs_inode);
Henry C Changd3d07202011-05-11 10:29:54 +00001995 ci->i_wb_ref++;
1996 dout("__take_cap_refs %p wb %d -> %d (?)\n",
1997 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
Sage Weila8599bd2009-10-06 11:31:12 -07001998 }
1999}
2000
2001/*
2002 * Try to grab cap references. Specify those refs we @want, and the
2003 * minimal set we @need. Also include the larger offset we are writing
2004 * to (when applicable), and check against max_size here as well.
2005 * Note that caller is responsible for ensuring max_size increases are
2006 * requested from the MDS.
2007 */
2008static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
2009 int *got, loff_t endoff, int *check_max, int *err)
2010{
2011 struct inode *inode = &ci->vfs_inode;
2012 int ret = 0;
2013 int have, implemented;
Sage Weil195d3ce2010-03-01 09:57:54 -08002014 int file_wanted;
Sage Weila8599bd2009-10-06 11:31:12 -07002015
2016 dout("get_cap_refs %p need %s want %s\n", inode,
2017 ceph_cap_string(need), ceph_cap_string(want));
Sage Weilbe655592011-11-30 09:47:09 -08002018 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002019
Sage Weil195d3ce2010-03-01 09:57:54 -08002020 /* make sure file is actually open */
2021 file_wanted = __ceph_caps_file_wanted(ci);
2022 if ((file_wanted & need) == 0) {
2023 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
2024 ceph_cap_string(need), ceph_cap_string(file_wanted));
Sage Weila8599bd2009-10-06 11:31:12 -07002025 *err = -EBADF;
2026 ret = 1;
2027 goto out;
2028 }
2029
2030 if (need & CEPH_CAP_FILE_WR) {
2031 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2032 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2033 inode, endoff, ci->i_max_size);
2034 if (endoff > ci->i_wanted_max_size) {
2035 *check_max = 1;
2036 ret = 1;
2037 }
2038 goto out;
2039 }
2040 /*
2041 * If a sync write is in progress, we must wait, so that we
2042 * can get a final snapshot value for size+mtime.
2043 */
2044 if (__ceph_have_pending_cap_snap(ci)) {
2045 dout("get_cap_refs %p cap_snap_pending\n", inode);
2046 goto out;
2047 }
2048 }
2049 have = __ceph_caps_issued(ci, &implemented);
2050
2051 /*
2052 * disallow writes while a truncate is pending
2053 */
2054 if (ci->i_truncate_pending)
2055 have &= ~CEPH_CAP_FILE_WR;
2056
2057 if ((have & need) == need) {
2058 /*
2059 * Look at (implemented & ~have & not) so that we keep waiting
2060 * on transition from wanted -> needed caps. This is needed
2061 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2062 * going before a prior buffered writeback happens.
2063 */
2064 int not = want & ~(have & need);
2065 int revoking = implemented & ~have;
2066 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2067 inode, ceph_cap_string(have), ceph_cap_string(not),
2068 ceph_cap_string(revoking));
2069 if ((revoking & not) == 0) {
2070 *got = need | (have & want);
2071 __take_cap_refs(ci, *got);
2072 ret = 1;
2073 }
2074 } else {
2075 dout("get_cap_refs %p have %s needed %s\n", inode,
2076 ceph_cap_string(have), ceph_cap_string(need));
2077 }
2078out:
Sage Weilbe655592011-11-30 09:47:09 -08002079 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002080 dout("get_cap_refs %p ret %d got %s\n", inode,
2081 ret, ceph_cap_string(*got));
2082 return ret;
2083}
2084
2085/*
2086 * Check the offset we are writing up to against our current
2087 * max_size. If necessary, tell the MDS we want to write to
2088 * a larger offset.
2089 */
2090static void check_max_size(struct inode *inode, loff_t endoff)
2091{
2092 struct ceph_inode_info *ci = ceph_inode(inode);
2093 int check = 0;
2094
2095 /* do we need to explicitly request a larger max_size? */
Sage Weilbe655592011-11-30 09:47:09 -08002096 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002097 if ((endoff >= ci->i_max_size ||
2098 endoff > (inode->i_size << 1)) &&
2099 endoff > ci->i_wanted_max_size) {
2100 dout("write %p at large endoff %llu, req max_size\n",
2101 inode, endoff);
2102 ci->i_wanted_max_size = endoff;
2103 check = 1;
2104 }
Sage Weilbe655592011-11-30 09:47:09 -08002105 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002106 if (check)
2107 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2108}
2109
2110/*
2111 * Wait for caps, and take cap references. If we can't get a WR cap
2112 * due to a small max_size, make sure we check_max_size (and possibly
2113 * ask the mds) so we don't get hung up indefinitely.
2114 */
2115int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got,
2116 loff_t endoff)
2117{
2118 int check_max, ret, err;
2119
2120retry:
2121 if (endoff > 0)
2122 check_max_size(&ci->vfs_inode, endoff);
2123 check_max = 0;
2124 err = 0;
2125 ret = wait_event_interruptible(ci->i_cap_wq,
2126 try_get_cap_refs(ci, need, want,
2127 got, endoff,
2128 &check_max, &err));
2129 if (err)
2130 ret = err;
2131 if (check_max)
2132 goto retry;
2133 return ret;
2134}
2135
2136/*
2137 * Take cap refs. Caller must already know we hold at least one ref
2138 * on the caps in question or we don't know this is safe.
2139 */
2140void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2141{
Sage Weilbe655592011-11-30 09:47:09 -08002142 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002143 __take_cap_refs(ci, caps);
Sage Weilbe655592011-11-30 09:47:09 -08002144 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002145}
2146
2147/*
2148 * Release cap refs.
2149 *
2150 * If we released the last ref on any given cap, call ceph_check_caps
2151 * to release (or schedule a release).
2152 *
2153 * If we are releasing a WR cap (from a sync write), finalize any affected
2154 * cap_snap, and wake up any waiters.
2155 */
2156void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
2157{
2158 struct inode *inode = &ci->vfs_inode;
2159 int last = 0, put = 0, flushsnaps = 0, wake = 0;
2160 struct ceph_cap_snap *capsnap;
2161
Sage Weilbe655592011-11-30 09:47:09 -08002162 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002163 if (had & CEPH_CAP_PIN)
2164 --ci->i_pin_ref;
2165 if (had & CEPH_CAP_FILE_RD)
2166 if (--ci->i_rd_ref == 0)
2167 last++;
2168 if (had & CEPH_CAP_FILE_CACHE)
2169 if (--ci->i_rdcache_ref == 0)
2170 last++;
2171 if (had & CEPH_CAP_FILE_BUFFER) {
Henry C Changd3d07202011-05-11 10:29:54 +00002172 if (--ci->i_wb_ref == 0) {
Sage Weila8599bd2009-10-06 11:31:12 -07002173 last++;
2174 put++;
2175 }
Henry C Changd3d07202011-05-11 10:29:54 +00002176 dout("put_cap_refs %p wb %d -> %d (?)\n",
2177 inode, ci->i_wb_ref+1, ci->i_wb_ref);
Sage Weila8599bd2009-10-06 11:31:12 -07002178 }
2179 if (had & CEPH_CAP_FILE_WR)
2180 if (--ci->i_wr_ref == 0) {
2181 last++;
2182 if (!list_empty(&ci->i_cap_snaps)) {
2183 capsnap = list_first_entry(&ci->i_cap_snaps,
2184 struct ceph_cap_snap,
2185 ci_item);
2186 if (capsnap->writing) {
2187 capsnap->writing = 0;
2188 flushsnaps =
2189 __ceph_finish_cap_snap(ci,
2190 capsnap);
2191 wake = 1;
2192 }
2193 }
2194 }
Sage Weilbe655592011-11-30 09:47:09 -08002195 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002196
Sage Weil819ccbf2010-04-01 09:33:46 -07002197 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
2198 last ? " last" : "", put ? " put" : "");
Sage Weila8599bd2009-10-06 11:31:12 -07002199
2200 if (last && !flushsnaps)
2201 ceph_check_caps(ci, 0, NULL);
2202 else if (flushsnaps)
2203 ceph_flush_snaps(ci);
2204 if (wake)
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002205 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07002206 if (put)
2207 iput(inode);
2208}
2209
2210/*
2211 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2212 * context. Adjust per-snap dirty page accounting as appropriate.
2213 * Once all dirty data for a cap_snap is flushed, flush snapped file
2214 * metadata back to the MDS. If we dropped the last ref, call
2215 * ceph_check_caps.
2216 */
2217void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
2218 struct ceph_snap_context *snapc)
2219{
2220 struct inode *inode = &ci->vfs_inode;
2221 int last = 0;
Sage Weil819ccbf2010-04-01 09:33:46 -07002222 int complete_capsnap = 0;
2223 int drop_capsnap = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07002224 int found = 0;
2225 struct ceph_cap_snap *capsnap = NULL;
2226
Sage Weilbe655592011-11-30 09:47:09 -08002227 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002228 ci->i_wrbuffer_ref -= nr;
2229 last = !ci->i_wrbuffer_ref;
2230
2231 if (ci->i_head_snapc == snapc) {
2232 ci->i_wrbuffer_ref_head -= nr;
Sage Weil7d8cb262010-08-24 08:44:16 -07002233 if (ci->i_wrbuffer_ref_head == 0 &&
2234 ci->i_dirty_caps == 0 && ci->i_flushing_caps == 0) {
2235 BUG_ON(!ci->i_head_snapc);
Sage Weila8599bd2009-10-06 11:31:12 -07002236 ceph_put_snap_context(ci->i_head_snapc);
2237 ci->i_head_snapc = NULL;
2238 }
2239 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2240 inode,
2241 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
2242 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
2243 last ? " LAST" : "");
2244 } else {
2245 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2246 if (capsnap->context == snapc) {
2247 found = 1;
Sage Weila8599bd2009-10-06 11:31:12 -07002248 break;
2249 }
2250 }
2251 BUG_ON(!found);
Sage Weil819ccbf2010-04-01 09:33:46 -07002252 capsnap->dirty_pages -= nr;
2253 if (capsnap->dirty_pages == 0) {
2254 complete_capsnap = 1;
2255 if (capsnap->dirty == 0)
2256 /* cap writeback completed before we created
2257 * the cap_snap; no FLUSHSNAP is needed */
2258 drop_capsnap = 1;
2259 }
Sage Weila8599bd2009-10-06 11:31:12 -07002260 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
Sage Weil819ccbf2010-04-01 09:33:46 -07002261 " snap %lld %d/%d -> %d/%d %s%s%s\n",
Sage Weila8599bd2009-10-06 11:31:12 -07002262 inode, capsnap, capsnap->context->seq,
2263 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
2264 ci->i_wrbuffer_ref, capsnap->dirty_pages,
2265 last ? " (wrbuffer last)" : "",
Sage Weil819ccbf2010-04-01 09:33:46 -07002266 complete_capsnap ? " (complete capsnap)" : "",
2267 drop_capsnap ? " (drop capsnap)" : "");
2268 if (drop_capsnap) {
2269 ceph_put_snap_context(capsnap->context);
2270 list_del(&capsnap->ci_item);
2271 list_del(&capsnap->flushing_item);
2272 ceph_put_cap_snap(capsnap);
2273 }
Sage Weila8599bd2009-10-06 11:31:12 -07002274 }
2275
Sage Weilbe655592011-11-30 09:47:09 -08002276 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002277
2278 if (last) {
2279 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2280 iput(inode);
Sage Weil819ccbf2010-04-01 09:33:46 -07002281 } else if (complete_capsnap) {
Sage Weila8599bd2009-10-06 11:31:12 -07002282 ceph_flush_snaps(ci);
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002283 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07002284 }
Sage Weil819ccbf2010-04-01 09:33:46 -07002285 if (drop_capsnap)
2286 iput(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07002287}
2288
2289/*
2290 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
2291 * actually be a revocation if it specifies a smaller cap set.)
2292 *
Sage Weilbe655592011-11-30 09:47:09 -08002293 * caller holds s_mutex and i_ceph_lock, we drop both.
Sage Weil15637c82010-03-16 13:42:00 -07002294 *
Sage Weila8599bd2009-10-06 11:31:12 -07002295 * return value:
2296 * 0 - ok
2297 * 1 - check_caps on auth cap only (writeback)
2298 * 2 - check_caps (ack revoke)
2299 */
Sage Weil15637c82010-03-16 13:42:00 -07002300static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
2301 struct ceph_mds_session *session,
2302 struct ceph_cap *cap,
2303 struct ceph_buffer *xattr_buf)
Sage Weilbe655592011-11-30 09:47:09 -08002304 __releases(ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07002305{
2306 struct ceph_inode_info *ci = ceph_inode(inode);
2307 int mds = session->s_mds;
Sage Weil2f56f562010-10-27 20:59:49 -07002308 int seq = le32_to_cpu(grant->seq);
Sage Weila8599bd2009-10-06 11:31:12 -07002309 int newcaps = le32_to_cpu(grant->caps);
2310 int issued, implemented, used, wanted, dirty;
2311 u64 size = le64_to_cpu(grant->size);
2312 u64 max_size = le64_to_cpu(grant->max_size);
2313 struct timespec mtime, atime, ctime;
Sage Weil15637c82010-03-16 13:42:00 -07002314 int check_caps = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07002315 int wake = 0;
2316 int writeback = 0;
2317 int revoked_rdcache = 0;
Sage Weil3c6f6b72010-02-09 15:24:44 -08002318 int queue_invalidate = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07002319
Sage Weil2f56f562010-10-27 20:59:49 -07002320 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
2321 inode, cap, mds, seq, ceph_cap_string(newcaps));
Sage Weila8599bd2009-10-06 11:31:12 -07002322 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
2323 inode->i_size);
2324
2325 /*
2326 * If CACHE is being revoked, and we have no dirty buffers,
2327 * try to invalidate (once). (If there are dirty buffers, we
2328 * will invalidate _after_ writeback.)
2329 */
Sage Weil3b454c42010-06-10 13:20:33 -07002330 if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
2331 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
Yehuda Sadehbcd2cbd2010-02-19 00:12:21 +00002332 !ci->i_wrbuffer_ref) {
Sage Weil5ecad6f2010-02-17 10:43:37 -08002333 if (try_nonblocking_invalidate(inode) == 0) {
2334 revoked_rdcache = 1;
2335 } else {
Sage Weila8599bd2009-10-06 11:31:12 -07002336 /* there were locked pages.. invalidate later
2337 in a separate thread. */
2338 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
Sage Weil3c6f6b72010-02-09 15:24:44 -08002339 queue_invalidate = 1;
Sage Weila8599bd2009-10-06 11:31:12 -07002340 ci->i_rdcache_revoking = ci->i_rdcache_gen;
2341 }
Sage Weila8599bd2009-10-06 11:31:12 -07002342 }
Sage Weila8599bd2009-10-06 11:31:12 -07002343 }
2344
2345 /* side effects now are allowed */
2346
2347 issued = __ceph_caps_issued(ci, &implemented);
2348 issued |= implemented | __ceph_caps_dirty(ci);
2349
Sage Weil685f9a5d2009-11-09 12:05:48 -08002350 cap->cap_gen = session->s_cap_gen;
Sage Weila8599bd2009-10-06 11:31:12 -07002351
2352 __check_cap_issue(ci, cap, newcaps);
2353
2354 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
2355 inode->i_mode = le32_to_cpu(grant->mode);
2356 inode->i_uid = le32_to_cpu(grant->uid);
2357 inode->i_gid = le32_to_cpu(grant->gid);
2358 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
2359 inode->i_uid, inode->i_gid);
2360 }
2361
2362 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
Miklos Szeredibfe86842011-10-28 14:13:29 +02002363 set_nlink(inode, le32_to_cpu(grant->nlink));
Sage Weila8599bd2009-10-06 11:31:12 -07002364
2365 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
2366 int len = le32_to_cpu(grant->xattr_len);
2367 u64 version = le64_to_cpu(grant->xattr_version);
2368
2369 if (version > ci->i_xattrs.version) {
2370 dout(" got new xattrs v%llu on %p len %d\n",
2371 version, inode, len);
2372 if (ci->i_xattrs.blob)
2373 ceph_buffer_put(ci->i_xattrs.blob);
2374 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
2375 ci->i_xattrs.version = version;
2376 }
2377 }
2378
2379 /* size/ctime/mtime/atime? */
2380 ceph_fill_file_size(inode, issued,
2381 le32_to_cpu(grant->truncate_seq),
2382 le64_to_cpu(grant->truncate_size), size);
2383 ceph_decode_timespec(&mtime, &grant->mtime);
2384 ceph_decode_timespec(&atime, &grant->atime);
2385 ceph_decode_timespec(&ctime, &grant->ctime);
2386 ceph_fill_file_time(inode, issued,
2387 le32_to_cpu(grant->time_warp_seq), &ctime, &mtime,
2388 &atime);
2389
2390 /* max size increase? */
2391 if (max_size != ci->i_max_size) {
2392 dout("max_size %lld -> %llu\n", ci->i_max_size, max_size);
2393 ci->i_max_size = max_size;
2394 if (max_size >= ci->i_wanted_max_size) {
2395 ci->i_wanted_max_size = 0; /* reset */
2396 ci->i_requested_max_size = 0;
2397 }
2398 wake = 1;
2399 }
2400
2401 /* check cap bits */
2402 wanted = __ceph_caps_wanted(ci);
2403 used = __ceph_caps_used(ci);
2404 dirty = __ceph_caps_dirty(ci);
2405 dout(" my wanted = %s, used = %s, dirty %s\n",
2406 ceph_cap_string(wanted),
2407 ceph_cap_string(used),
2408 ceph_cap_string(dirty));
2409 if (wanted != le32_to_cpu(grant->wanted)) {
2410 dout("mds wanted %s -> %s\n",
2411 ceph_cap_string(le32_to_cpu(grant->wanted)),
2412 ceph_cap_string(wanted));
2413 grant->wanted = cpu_to_le32(wanted);
2414 }
2415
2416 cap->seq = seq;
2417
2418 /* file layout may have changed */
2419 ci->i_layout = grant->layout;
2420
2421 /* revocation, grant, or no-op? */
2422 if (cap->issued & ~newcaps) {
Sage Weil3b454c42010-06-10 13:20:33 -07002423 int revoking = cap->issued & ~newcaps;
2424
2425 dout("revocation: %s -> %s (revoking %s)\n",
2426 ceph_cap_string(cap->issued),
2427 ceph_cap_string(newcaps),
2428 ceph_cap_string(revoking));
Sage Weil0eb6cd42010-08-05 13:53:18 -07002429 if (revoking & used & CEPH_CAP_FILE_BUFFER)
Sage Weil3b454c42010-06-10 13:20:33 -07002430 writeback = 1; /* initiate writeback; will delay ack */
2431 else if (revoking == CEPH_CAP_FILE_CACHE &&
2432 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2433 queue_invalidate)
2434 ; /* do nothing yet, invalidation will be queued */
2435 else if (cap == ci->i_auth_cap)
2436 check_caps = 1; /* check auth cap only */
2437 else
2438 check_caps = 2; /* check all caps */
Sage Weila8599bd2009-10-06 11:31:12 -07002439 cap->issued = newcaps;
Sage Weil978097c2010-03-08 15:27:53 -08002440 cap->implemented |= newcaps;
Sage Weila8599bd2009-10-06 11:31:12 -07002441 } else if (cap->issued == newcaps) {
2442 dout("caps unchanged: %s -> %s\n",
2443 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
2444 } else {
2445 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
2446 ceph_cap_string(newcaps));
2447 cap->issued = newcaps;
2448 cap->implemented |= newcaps; /* add bits only, to
2449 * avoid stepping on a
2450 * pending revocation */
2451 wake = 1;
2452 }
Sage Weil978097c2010-03-08 15:27:53 -08002453 BUG_ON(cap->issued & ~cap->implemented);
Sage Weila8599bd2009-10-06 11:31:12 -07002454
Sage Weilbe655592011-11-30 09:47:09 -08002455 spin_unlock(&ci->i_ceph_lock);
Sage Weil3c6f6b72010-02-09 15:24:44 -08002456 if (writeback)
Sage Weila8599bd2009-10-06 11:31:12 -07002457 /*
2458 * queue inode for writeback: we can't actually call
2459 * filemap_write_and_wait, etc. from message handler
2460 * context.
2461 */
Sage Weil3c6f6b72010-02-09 15:24:44 -08002462 ceph_queue_writeback(inode);
2463 if (queue_invalidate)
2464 ceph_queue_invalidate(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07002465 if (wake)
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002466 wake_up_all(&ci->i_cap_wq);
Sage Weil15637c82010-03-16 13:42:00 -07002467
2468 if (check_caps == 1)
2469 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
2470 session);
2471 else if (check_caps == 2)
2472 ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
2473 else
2474 mutex_unlock(&session->s_mutex);
Sage Weila8599bd2009-10-06 11:31:12 -07002475}
2476
2477/*
2478 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
2479 * MDS has been safely committed.
2480 */
Sage Weil6df058c2009-12-22 11:24:33 -08002481static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
Sage Weila8599bd2009-10-06 11:31:12 -07002482 struct ceph_mds_caps *m,
2483 struct ceph_mds_session *session,
2484 struct ceph_cap *cap)
Sage Weilbe655592011-11-30 09:47:09 -08002485 __releases(ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07002486{
2487 struct ceph_inode_info *ci = ceph_inode(inode);
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002488 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07002489 unsigned seq = le32_to_cpu(m->seq);
2490 int dirty = le32_to_cpu(m->dirty);
2491 int cleaned = 0;
Sage Weilafcdaea2009-10-14 14:27:38 -07002492 int drop = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07002493 int i;
2494
2495 for (i = 0; i < CEPH_CAP_BITS; i++)
2496 if ((dirty & (1 << i)) &&
2497 flush_tid == ci->i_cap_flush_tid[i])
2498 cleaned |= 1 << i;
2499
2500 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
2501 " flushing %s -> %s\n",
2502 inode, session->s_mds, seq, ceph_cap_string(dirty),
2503 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
2504 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
2505
2506 if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned))
2507 goto out;
2508
Sage Weila8599bd2009-10-06 11:31:12 -07002509 ci->i_flushing_caps &= ~cleaned;
Sage Weila8599bd2009-10-06 11:31:12 -07002510
2511 spin_lock(&mdsc->cap_dirty_lock);
2512 if (ci->i_flushing_caps == 0) {
2513 list_del_init(&ci->i_flushing_item);
2514 if (!list_empty(&session->s_cap_flushing))
2515 dout(" mds%d still flushing cap on %p\n",
2516 session->s_mds,
2517 &list_entry(session->s_cap_flushing.next,
2518 struct ceph_inode_info,
2519 i_flushing_item)->vfs_inode);
2520 mdsc->num_cap_flushing--;
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002521 wake_up_all(&mdsc->cap_flushing_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07002522 dout(" inode %p now !flushing\n", inode);
Sage Weilafcdaea2009-10-14 14:27:38 -07002523
2524 if (ci->i_dirty_caps == 0) {
2525 dout(" inode %p now clean\n", inode);
2526 BUG_ON(!list_empty(&ci->i_dirty_item));
2527 drop = 1;
Sage Weil7d8cb262010-08-24 08:44:16 -07002528 if (ci->i_wrbuffer_ref_head == 0) {
2529 BUG_ON(!ci->i_head_snapc);
2530 ceph_put_snap_context(ci->i_head_snapc);
2531 ci->i_head_snapc = NULL;
2532 }
Sage Weil76e3b392009-10-15 18:13:53 -07002533 } else {
2534 BUG_ON(list_empty(&ci->i_dirty_item));
Sage Weilafcdaea2009-10-14 14:27:38 -07002535 }
Sage Weila8599bd2009-10-06 11:31:12 -07002536 }
2537 spin_unlock(&mdsc->cap_dirty_lock);
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002538 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07002539
2540out:
Sage Weilbe655592011-11-30 09:47:09 -08002541 spin_unlock(&ci->i_ceph_lock);
Sage Weilafcdaea2009-10-14 14:27:38 -07002542 if (drop)
Sage Weila8599bd2009-10-06 11:31:12 -07002543 iput(inode);
2544}
2545
2546/*
2547 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
2548 * throw away our cap_snap.
2549 *
2550 * Caller hold s_mutex.
2551 */
Sage Weil6df058c2009-12-22 11:24:33 -08002552static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
Sage Weila8599bd2009-10-06 11:31:12 -07002553 struct ceph_mds_caps *m,
2554 struct ceph_mds_session *session)
2555{
2556 struct ceph_inode_info *ci = ceph_inode(inode);
2557 u64 follows = le64_to_cpu(m->snap_follows);
Sage Weila8599bd2009-10-06 11:31:12 -07002558 struct ceph_cap_snap *capsnap;
2559 int drop = 0;
2560
2561 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
2562 inode, ci, session->s_mds, follows);
2563
Sage Weilbe655592011-11-30 09:47:09 -08002564 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002565 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2566 if (capsnap->follows == follows) {
2567 if (capsnap->flush_tid != flush_tid) {
2568 dout(" cap_snap %p follows %lld tid %lld !="
2569 " %lld\n", capsnap, follows,
2570 flush_tid, capsnap->flush_tid);
2571 break;
2572 }
2573 WARN_ON(capsnap->dirty_pages || capsnap->writing);
Sage Weil819ccbf2010-04-01 09:33:46 -07002574 dout(" removing %p cap_snap %p follows %lld\n",
2575 inode, capsnap, follows);
Sage Weila8599bd2009-10-06 11:31:12 -07002576 ceph_put_snap_context(capsnap->context);
2577 list_del(&capsnap->ci_item);
2578 list_del(&capsnap->flushing_item);
2579 ceph_put_cap_snap(capsnap);
2580 drop = 1;
2581 break;
2582 } else {
2583 dout(" skipping cap_snap %p follows %lld\n",
2584 capsnap, capsnap->follows);
2585 }
2586 }
Sage Weilbe655592011-11-30 09:47:09 -08002587 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002588 if (drop)
2589 iput(inode);
2590}
2591
2592/*
2593 * Handle TRUNC from MDS, indicating file truncation.
2594 *
2595 * caller hold s_mutex.
2596 */
2597static void handle_cap_trunc(struct inode *inode,
2598 struct ceph_mds_caps *trunc,
2599 struct ceph_mds_session *session)
Sage Weilbe655592011-11-30 09:47:09 -08002600 __releases(ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07002601{
2602 struct ceph_inode_info *ci = ceph_inode(inode);
2603 int mds = session->s_mds;
2604 int seq = le32_to_cpu(trunc->seq);
2605 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
2606 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
2607 u64 size = le64_to_cpu(trunc->size);
2608 int implemented = 0;
2609 int dirty = __ceph_caps_dirty(ci);
2610 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
2611 int queue_trunc = 0;
2612
2613 issued |= implemented | dirty;
2614
2615 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
2616 inode, mds, seq, truncate_size, truncate_seq);
2617 queue_trunc = ceph_fill_file_size(inode, issued,
2618 truncate_seq, truncate_size, size);
Sage Weilbe655592011-11-30 09:47:09 -08002619 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002620
2621 if (queue_trunc)
Sage Weil3c6f6b72010-02-09 15:24:44 -08002622 ceph_queue_vmtruncate(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07002623}
2624
2625/*
2626 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
2627 * different one. If we are the most recent migration we've seen (as
2628 * indicated by mseq), make note of the migrating cap bits for the
2629 * duration (until we see the corresponding IMPORT).
2630 *
2631 * caller holds s_mutex
2632 */
2633static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
Sage Weil154f42c2010-06-21 13:45:04 -07002634 struct ceph_mds_session *session,
2635 int *open_target_sessions)
Sage Weila8599bd2009-10-06 11:31:12 -07002636{
Sage Weildb354052011-05-24 11:46:31 -07002637 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07002638 struct ceph_inode_info *ci = ceph_inode(inode);
2639 int mds = session->s_mds;
2640 unsigned mseq = le32_to_cpu(ex->migrate_seq);
2641 struct ceph_cap *cap = NULL, *t;
2642 struct rb_node *p;
2643 int remember = 1;
2644
2645 dout("handle_cap_export inode %p ci %p mds%d mseq %d\n",
2646 inode, ci, mds, mseq);
2647
Sage Weilbe655592011-11-30 09:47:09 -08002648 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002649
2650 /* make sure we haven't seen a higher mseq */
2651 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
2652 t = rb_entry(p, struct ceph_cap, ci_node);
2653 if (ceph_seq_cmp(t->mseq, mseq) > 0) {
2654 dout(" higher mseq on cap from mds%d\n",
2655 t->session->s_mds);
2656 remember = 0;
2657 }
2658 if (t->session->s_mds == mds)
2659 cap = t;
2660 }
2661
2662 if (cap) {
2663 if (remember) {
2664 /* make note */
2665 ci->i_cap_exporting_mds = mds;
2666 ci->i_cap_exporting_mseq = mseq;
2667 ci->i_cap_exporting_issued = cap->issued;
Sage Weil154f42c2010-06-21 13:45:04 -07002668
2669 /*
2670 * make sure we have open sessions with all possible
2671 * export targets, so that we get the matching IMPORT
2672 */
2673 *open_target_sessions = 1;
Sage Weildb354052011-05-24 11:46:31 -07002674
2675 /*
2676 * we can't flush dirty caps that we've seen the
2677 * EXPORT but no IMPORT for
2678 */
2679 spin_lock(&mdsc->cap_dirty_lock);
2680 if (!list_empty(&ci->i_dirty_item)) {
2681 dout(" moving %p to cap_dirty_migrating\n",
2682 inode);
2683 list_move(&ci->i_dirty_item,
2684 &mdsc->cap_dirty_migrating);
2685 }
2686 spin_unlock(&mdsc->cap_dirty_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002687 }
Sage Weil7c1332b2010-02-16 11:39:45 -08002688 __ceph_remove_cap(cap);
Sage Weila8599bd2009-10-06 11:31:12 -07002689 }
Sage Weil4ea00432010-03-16 10:36:40 -07002690 /* else, we already released it */
Sage Weila8599bd2009-10-06 11:31:12 -07002691
Sage Weilbe655592011-11-30 09:47:09 -08002692 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002693}
2694
2695/*
2696 * Handle cap IMPORT. If there are temp bits from an older EXPORT,
2697 * clean them up.
2698 *
2699 * caller holds s_mutex.
2700 */
2701static void handle_cap_import(struct ceph_mds_client *mdsc,
2702 struct inode *inode, struct ceph_mds_caps *im,
2703 struct ceph_mds_session *session,
2704 void *snaptrace, int snaptrace_len)
2705{
2706 struct ceph_inode_info *ci = ceph_inode(inode);
2707 int mds = session->s_mds;
2708 unsigned issued = le32_to_cpu(im->caps);
2709 unsigned wanted = le32_to_cpu(im->wanted);
2710 unsigned seq = le32_to_cpu(im->seq);
2711 unsigned mseq = le32_to_cpu(im->migrate_seq);
2712 u64 realmino = le64_to_cpu(im->realm);
2713 u64 cap_id = le64_to_cpu(im->cap_id);
2714
2715 if (ci->i_cap_exporting_mds >= 0 &&
2716 ceph_seq_cmp(ci->i_cap_exporting_mseq, mseq) < 0) {
2717 dout("handle_cap_import inode %p ci %p mds%d mseq %d"
2718 " - cleared exporting from mds%d\n",
2719 inode, ci, mds, mseq,
2720 ci->i_cap_exporting_mds);
2721 ci->i_cap_exporting_issued = 0;
2722 ci->i_cap_exporting_mseq = 0;
2723 ci->i_cap_exporting_mds = -1;
Sage Weildb354052011-05-24 11:46:31 -07002724
2725 spin_lock(&mdsc->cap_dirty_lock);
2726 if (!list_empty(&ci->i_dirty_item)) {
2727 dout(" moving %p back to cap_dirty\n", inode);
2728 list_move(&ci->i_dirty_item, &mdsc->cap_dirty);
2729 }
2730 spin_unlock(&mdsc->cap_dirty_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002731 } else {
2732 dout("handle_cap_import inode %p ci %p mds%d mseq %d\n",
2733 inode, ci, mds, mseq);
2734 }
2735
2736 down_write(&mdsc->snap_rwsem);
2737 ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len,
2738 false);
2739 downgrade_write(&mdsc->snap_rwsem);
2740 ceph_add_cap(inode, session, cap_id, -1,
2741 issued, wanted, seq, mseq, realmino, CEPH_CAP_FLAG_AUTH,
2742 NULL /* no caps context */);
Sage Weil088b3f52011-01-18 08:56:01 -08002743 kick_flushing_inode_caps(mdsc, session, inode);
Sage Weila8599bd2009-10-06 11:31:12 -07002744 up_read(&mdsc->snap_rwsem);
Sage Weilfeb4cc92010-11-07 09:39:00 -08002745
2746 /* make sure we re-request max_size, if necessary */
Sage Weilbe655592011-11-30 09:47:09 -08002747 spin_lock(&ci->i_ceph_lock);
Sage Weilfeb4cc92010-11-07 09:39:00 -08002748 ci->i_requested_max_size = 0;
Sage Weilbe655592011-11-30 09:47:09 -08002749 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002750}
2751
2752/*
2753 * Handle a caps message from the MDS.
2754 *
2755 * Identify the appropriate session, inode, and call the right handler
2756 * based on the cap op.
2757 */
2758void ceph_handle_caps(struct ceph_mds_session *session,
2759 struct ceph_msg *msg)
2760{
2761 struct ceph_mds_client *mdsc = session->s_mdsc;
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002762 struct super_block *sb = mdsc->fsc->sb;
Sage Weila8599bd2009-10-06 11:31:12 -07002763 struct inode *inode;
Sage Weilbe655592011-11-30 09:47:09 -08002764 struct ceph_inode_info *ci;
Sage Weila8599bd2009-10-06 11:31:12 -07002765 struct ceph_cap *cap;
2766 struct ceph_mds_caps *h;
Sage Weil2600d2d2010-02-22 15:12:16 -08002767 int mds = session->s_mds;
Sage Weila8599bd2009-10-06 11:31:12 -07002768 int op;
Sage Weil3d7ded42010-06-09 16:47:10 -07002769 u32 seq, mseq;
Sage Weila8599bd2009-10-06 11:31:12 -07002770 struct ceph_vino vino;
2771 u64 cap_id;
2772 u64 size, max_size;
Sage Weil6df058c2009-12-22 11:24:33 -08002773 u64 tid;
Sage Weil70edb552010-03-01 13:20:50 -08002774 void *snaptrace;
Sage Weilce1fbc82010-08-02 15:09:39 -07002775 size_t snaptrace_len;
2776 void *flock;
2777 u32 flock_len;
Sage Weil154f42c2010-06-21 13:45:04 -07002778 int open_target_sessions = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07002779
2780 dout("handle_caps from mds%d\n", mds);
2781
2782 /* decode */
Sage Weil6df058c2009-12-22 11:24:33 -08002783 tid = le64_to_cpu(msg->hdr.tid);
Sage Weila8599bd2009-10-06 11:31:12 -07002784 if (msg->front.iov_len < sizeof(*h))
2785 goto bad;
2786 h = msg->front.iov_base;
2787 op = le32_to_cpu(h->op);
2788 vino.ino = le64_to_cpu(h->ino);
2789 vino.snap = CEPH_NOSNAP;
2790 cap_id = le64_to_cpu(h->cap_id);
2791 seq = le32_to_cpu(h->seq);
Sage Weil3d7ded42010-06-09 16:47:10 -07002792 mseq = le32_to_cpu(h->migrate_seq);
Sage Weila8599bd2009-10-06 11:31:12 -07002793 size = le64_to_cpu(h->size);
2794 max_size = le64_to_cpu(h->max_size);
2795
Sage Weilce1fbc82010-08-02 15:09:39 -07002796 snaptrace = h + 1;
2797 snaptrace_len = le32_to_cpu(h->snap_trace_len);
2798
2799 if (le16_to_cpu(msg->hdr.version) >= 2) {
2800 void *p, *end;
2801
2802 p = snaptrace + snaptrace_len;
2803 end = msg->front.iov_base + msg->front.iov_len;
2804 ceph_decode_32_safe(&p, end, flock_len, bad);
2805 flock = p;
2806 } else {
2807 flock = NULL;
2808 flock_len = 0;
2809 }
2810
Sage Weila8599bd2009-10-06 11:31:12 -07002811 mutex_lock(&session->s_mutex);
2812 session->s_seq++;
2813 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
2814 (unsigned)seq);
2815
2816 /* lookup ino */
2817 inode = ceph_find_inode(sb, vino);
Sage Weilbe655592011-11-30 09:47:09 -08002818 ci = ceph_inode(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07002819 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
2820 vino.snap, inode);
2821 if (!inode) {
2822 dout(" i don't have ino %llx\n", vino.ino);
Sage Weil3d7ded42010-06-09 16:47:10 -07002823
2824 if (op == CEPH_CAP_OP_IMPORT)
2825 __queue_cap_release(session, vino.ino, cap_id,
2826 mseq, seq);
Greg Farnum21b559d2010-10-06 15:46:30 -07002827 goto flush_cap_releases;
Sage Weila8599bd2009-10-06 11:31:12 -07002828 }
2829
2830 /* these will work even if we don't have a cap yet */
2831 switch (op) {
2832 case CEPH_CAP_OP_FLUSHSNAP_ACK:
Sage Weil6df058c2009-12-22 11:24:33 -08002833 handle_cap_flushsnap_ack(inode, tid, h, session);
Sage Weila8599bd2009-10-06 11:31:12 -07002834 goto done;
2835
2836 case CEPH_CAP_OP_EXPORT:
Sage Weil154f42c2010-06-21 13:45:04 -07002837 handle_cap_export(inode, h, session, &open_target_sessions);
Sage Weila8599bd2009-10-06 11:31:12 -07002838 goto done;
2839
2840 case CEPH_CAP_OP_IMPORT:
2841 handle_cap_import(mdsc, inode, h, session,
Sage Weilce1fbc82010-08-02 15:09:39 -07002842 snaptrace, snaptrace_len);
Sage Weil7e57b812011-01-18 09:00:01 -08002843 ceph_check_caps(ceph_inode(inode), 0, session);
Sage Weil15637c82010-03-16 13:42:00 -07002844 goto done_unlocked;
Sage Weila8599bd2009-10-06 11:31:12 -07002845 }
2846
2847 /* the rest require a cap */
Sage Weilbe655592011-11-30 09:47:09 -08002848 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002849 cap = __get_cap_for_mds(ceph_inode(inode), mds);
2850 if (!cap) {
Sage Weil9dbd4122010-06-10 13:21:20 -07002851 dout(" no cap on %p ino %llx.%llx from mds%d\n",
Sage Weila8599bd2009-10-06 11:31:12 -07002852 inode, ceph_ino(inode), ceph_snap(inode), mds);
Sage Weilbe655592011-11-30 09:47:09 -08002853 spin_unlock(&ci->i_ceph_lock);
Greg Farnum21b559d2010-10-06 15:46:30 -07002854 goto flush_cap_releases;
Sage Weila8599bd2009-10-06 11:31:12 -07002855 }
2856
Sage Weilbe655592011-11-30 09:47:09 -08002857 /* note that each of these drops i_ceph_lock for us */
Sage Weila8599bd2009-10-06 11:31:12 -07002858 switch (op) {
2859 case CEPH_CAP_OP_REVOKE:
2860 case CEPH_CAP_OP_GRANT:
Sage Weil15637c82010-03-16 13:42:00 -07002861 handle_cap_grant(inode, h, session, cap, msg->middle);
2862 goto done_unlocked;
Sage Weila8599bd2009-10-06 11:31:12 -07002863
2864 case CEPH_CAP_OP_FLUSH_ACK:
Sage Weil6df058c2009-12-22 11:24:33 -08002865 handle_cap_flush_ack(inode, tid, h, session, cap);
Sage Weila8599bd2009-10-06 11:31:12 -07002866 break;
2867
2868 case CEPH_CAP_OP_TRUNC:
2869 handle_cap_trunc(inode, h, session);
2870 break;
2871
2872 default:
Sage Weilbe655592011-11-30 09:47:09 -08002873 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002874 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
2875 ceph_cap_op_name(op));
2876 }
2877
Greg Farnum21b559d2010-10-06 15:46:30 -07002878 goto done;
2879
2880flush_cap_releases:
2881 /*
2882 * send any full release message to try to move things
2883 * along for the mds (who clearly thinks we still have this
2884 * cap).
2885 */
2886 ceph_add_cap_releases(mdsc, session);
2887 ceph_send_cap_releases(mdsc, session);
2888
Sage Weila8599bd2009-10-06 11:31:12 -07002889done:
Sage Weil15637c82010-03-16 13:42:00 -07002890 mutex_unlock(&session->s_mutex);
2891done_unlocked:
Sage Weila8599bd2009-10-06 11:31:12 -07002892 if (inode)
2893 iput(inode);
Sage Weil154f42c2010-06-21 13:45:04 -07002894 if (open_target_sessions)
2895 ceph_mdsc_open_export_target_sessions(mdsc, session);
Sage Weila8599bd2009-10-06 11:31:12 -07002896 return;
2897
2898bad:
2899 pr_err("ceph_handle_caps: corrupt message\n");
Sage Weil9ec7cab2009-12-14 15:13:47 -08002900 ceph_msg_dump(msg);
Sage Weila8599bd2009-10-06 11:31:12 -07002901 return;
2902}
2903
2904/*
2905 * Delayed work handler to process end of delayed cap release LRU list.
2906 */
Sage Weilafcdaea2009-10-14 14:27:38 -07002907void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
Sage Weila8599bd2009-10-06 11:31:12 -07002908{
2909 struct ceph_inode_info *ci;
2910 int flags = CHECK_CAPS_NODELAY;
2911
Sage Weila8599bd2009-10-06 11:31:12 -07002912 dout("check_delayed_caps\n");
2913 while (1) {
2914 spin_lock(&mdsc->cap_delay_lock);
2915 if (list_empty(&mdsc->cap_delay_list))
2916 break;
2917 ci = list_first_entry(&mdsc->cap_delay_list,
2918 struct ceph_inode_info,
2919 i_cap_delay_list);
2920 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
2921 time_before(jiffies, ci->i_hold_caps_max))
2922 break;
2923 list_del_init(&ci->i_cap_delay_list);
2924 spin_unlock(&mdsc->cap_delay_lock);
2925 dout("check_delayed_caps on %p\n", &ci->vfs_inode);
2926 ceph_check_caps(ci, flags, NULL);
2927 }
2928 spin_unlock(&mdsc->cap_delay_lock);
2929}
2930
2931/*
Sage Weilafcdaea2009-10-14 14:27:38 -07002932 * Flush all dirty caps to the mds
2933 */
2934void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
2935{
Sage Weildb354052011-05-24 11:46:31 -07002936 struct ceph_inode_info *ci;
2937 struct inode *inode;
Sage Weilafcdaea2009-10-14 14:27:38 -07002938
2939 dout("flush_dirty_caps\n");
2940 spin_lock(&mdsc->cap_dirty_lock);
Sage Weildb354052011-05-24 11:46:31 -07002941 while (!list_empty(&mdsc->cap_dirty)) {
2942 ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info,
2943 i_dirty_item);
Sage Weil70b666c2011-05-27 09:24:26 -07002944 inode = &ci->vfs_inode;
2945 ihold(inode);
Sage Weildb354052011-05-24 11:46:31 -07002946 dout("flush_dirty_caps %p\n", inode);
Sage Weilafcdaea2009-10-14 14:27:38 -07002947 spin_unlock(&mdsc->cap_dirty_lock);
Sage Weil70b666c2011-05-27 09:24:26 -07002948 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL);
2949 iput(inode);
Sage Weilafcdaea2009-10-14 14:27:38 -07002950 spin_lock(&mdsc->cap_dirty_lock);
2951 }
2952 spin_unlock(&mdsc->cap_dirty_lock);
Sage Weildb354052011-05-24 11:46:31 -07002953 dout("flush_dirty_caps done\n");
Sage Weilafcdaea2009-10-14 14:27:38 -07002954}
2955
2956/*
Sage Weila8599bd2009-10-06 11:31:12 -07002957 * Drop open file reference. If we were the last open file,
2958 * we may need to release capabilities to the MDS (or schedule
2959 * their delayed release).
2960 */
2961void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
2962{
2963 struct inode *inode = &ci->vfs_inode;
2964 int last = 0;
2965
Sage Weilbe655592011-11-30 09:47:09 -08002966 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002967 dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode,
2968 ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1);
2969 BUG_ON(ci->i_nr_by_mode[fmode] == 0);
2970 if (--ci->i_nr_by_mode[fmode] == 0)
2971 last++;
Sage Weilbe655592011-11-30 09:47:09 -08002972 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002973
2974 if (last && ci->i_vino.snap == CEPH_NOSNAP)
2975 ceph_check_caps(ci, 0, NULL);
2976}
2977
2978/*
2979 * Helpers for embedding cap and dentry lease releases into mds
2980 * requests.
2981 *
2982 * @force is used by dentry_release (below) to force inclusion of a
2983 * record for the directory inode, even when there aren't any caps to
2984 * drop.
2985 */
2986int ceph_encode_inode_release(void **p, struct inode *inode,
2987 int mds, int drop, int unless, int force)
2988{
2989 struct ceph_inode_info *ci = ceph_inode(inode);
2990 struct ceph_cap *cap;
2991 struct ceph_mds_request_release *rel = *p;
Sage Weilec97f882010-06-24 15:12:37 -07002992 int used, dirty;
Sage Weila8599bd2009-10-06 11:31:12 -07002993 int ret = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07002994
Sage Weilbe655592011-11-30 09:47:09 -08002995 spin_lock(&ci->i_ceph_lock);
Sage Weil916623d2010-03-16 15:01:07 -07002996 used = __ceph_caps_used(ci);
Sage Weilec97f882010-06-24 15:12:37 -07002997 dirty = __ceph_caps_dirty(ci);
Sage Weil916623d2010-03-16 15:01:07 -07002998
Sage Weilec97f882010-06-24 15:12:37 -07002999 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
3000 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
Sage Weil916623d2010-03-16 15:01:07 -07003001 ceph_cap_string(unless));
3002
Sage Weilec97f882010-06-24 15:12:37 -07003003 /* only drop unused, clean caps */
3004 drop &= ~(used | dirty);
Sage Weil916623d2010-03-16 15:01:07 -07003005
Sage Weila8599bd2009-10-06 11:31:12 -07003006 cap = __get_cap_for_mds(ci, mds);
3007 if (cap && __cap_is_valid(cap)) {
3008 if (force ||
3009 ((cap->issued & drop) &&
3010 (cap->issued & unless) == 0)) {
3011 if ((cap->issued & drop) &&
3012 (cap->issued & unless) == 0) {
3013 dout("encode_inode_release %p cap %p %s -> "
3014 "%s\n", inode, cap,
3015 ceph_cap_string(cap->issued),
3016 ceph_cap_string(cap->issued & ~drop));
3017 cap->issued &= ~drop;
3018 cap->implemented &= ~drop;
3019 if (ci->i_ceph_flags & CEPH_I_NODELAY) {
3020 int wanted = __ceph_caps_wanted(ci);
3021 dout(" wanted %s -> %s (act %s)\n",
3022 ceph_cap_string(cap->mds_wanted),
3023 ceph_cap_string(cap->mds_wanted &
3024 ~wanted),
3025 ceph_cap_string(wanted));
3026 cap->mds_wanted &= wanted;
3027 }
3028 } else {
3029 dout("encode_inode_release %p cap %p %s"
3030 " (force)\n", inode, cap,
3031 ceph_cap_string(cap->issued));
3032 }
3033
3034 rel->ino = cpu_to_le64(ceph_ino(inode));
3035 rel->cap_id = cpu_to_le64(cap->cap_id);
3036 rel->seq = cpu_to_le32(cap->seq);
3037 rel->issue_seq = cpu_to_le32(cap->issue_seq),
3038 rel->mseq = cpu_to_le32(cap->mseq);
3039 rel->caps = cpu_to_le32(cap->issued);
3040 rel->wanted = cpu_to_le32(cap->mds_wanted);
3041 rel->dname_len = 0;
3042 rel->dname_seq = 0;
3043 *p += sizeof(*rel);
3044 ret = 1;
3045 } else {
3046 dout("encode_inode_release %p cap %p %s\n",
3047 inode, cap, ceph_cap_string(cap->issued));
3048 }
3049 }
Sage Weilbe655592011-11-30 09:47:09 -08003050 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07003051 return ret;
3052}
3053
3054int ceph_encode_dentry_release(void **p, struct dentry *dentry,
3055 int mds, int drop, int unless)
3056{
3057 struct inode *dir = dentry->d_parent->d_inode;
3058 struct ceph_mds_request_release *rel = *p;
3059 struct ceph_dentry_info *di = ceph_dentry(dentry);
3060 int force = 0;
3061 int ret;
3062
3063 /*
3064 * force an record for the directory caps if we have a dentry lease.
Sage Weilbe655592011-11-30 09:47:09 -08003065 * this is racy (can't take i_ceph_lock and d_lock together), but it
Sage Weila8599bd2009-10-06 11:31:12 -07003066 * doesn't have to be perfect; the mds will revoke anything we don't
3067 * release.
3068 */
3069 spin_lock(&dentry->d_lock);
3070 if (di->lease_session && di->lease_session->s_mds == mds)
3071 force = 1;
3072 spin_unlock(&dentry->d_lock);
3073
3074 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
3075
3076 spin_lock(&dentry->d_lock);
3077 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
3078 dout("encode_dentry_release %p mds%d seq %d\n",
3079 dentry, mds, (int)di->lease_seq);
3080 rel->dname_len = cpu_to_le32(dentry->d_name.len);
3081 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
3082 *p += dentry->d_name.len;
3083 rel->dname_seq = cpu_to_le32(di->lease_seq);
Sage Weil1dadcce2010-07-23 13:54:21 -07003084 __ceph_mdsc_drop_dentry_lease(dentry);
Sage Weila8599bd2009-10-06 11:31:12 -07003085 }
3086 spin_unlock(&dentry->d_lock);
3087 return ret;
3088}