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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"
Milosz Tanski99ccbd22013-08-21 17:29:54 -040013#include "cache.h"
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -070014#include <linux/ceph/decode.h>
15#include <linux/ceph/messenger.h>
Sage Weila8599bd2009-10-06 11:31:12 -070016
17/*
18 * Capability management
19 *
20 * The Ceph metadata servers control client access to inode metadata
21 * and file data by issuing capabilities, granting clients permission
22 * to read and/or write both inode field and file data to OSDs
23 * (storage nodes). Each capability consists of a set of bits
24 * indicating which operations are allowed.
25 *
26 * If the client holds a *_SHARED cap, the client has a coherent value
27 * that can be safely read from the cached inode.
28 *
29 * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
30 * client is allowed to change inode attributes (e.g., file size,
31 * mtime), note its dirty state in the ceph_cap, and asynchronously
32 * flush that metadata change to the MDS.
33 *
34 * In the event of a conflicting operation (perhaps by another
35 * client), the MDS will revoke the conflicting client capabilities.
36 *
37 * In order for a client to cache an inode, it must hold a capability
38 * with at least one MDS server. When inodes are released, release
39 * notifications are batched and periodically sent en masse to the MDS
40 * cluster to release server state.
41 */
42
43
44/*
45 * Generate readable cap strings for debugging output.
46 */
47#define MAX_CAP_STR 20
48static char cap_str[MAX_CAP_STR][40];
49static DEFINE_SPINLOCK(cap_str_lock);
50static int last_cap_str;
51
52static char *gcap_string(char *s, int c)
53{
54 if (c & CEPH_CAP_GSHARED)
55 *s++ = 's';
56 if (c & CEPH_CAP_GEXCL)
57 *s++ = 'x';
58 if (c & CEPH_CAP_GCACHE)
59 *s++ = 'c';
60 if (c & CEPH_CAP_GRD)
61 *s++ = 'r';
62 if (c & CEPH_CAP_GWR)
63 *s++ = 'w';
64 if (c & CEPH_CAP_GBUFFER)
65 *s++ = 'b';
66 if (c & CEPH_CAP_GLAZYIO)
67 *s++ = 'l';
68 return s;
69}
70
71const char *ceph_cap_string(int caps)
72{
73 int i;
74 char *s;
75 int c;
76
77 spin_lock(&cap_str_lock);
78 i = last_cap_str++;
79 if (last_cap_str == MAX_CAP_STR)
80 last_cap_str = 0;
81 spin_unlock(&cap_str_lock);
82
83 s = cap_str[i];
84
85 if (caps & CEPH_CAP_PIN)
86 *s++ = 'p';
87
88 c = (caps >> CEPH_CAP_SAUTH) & 3;
89 if (c) {
90 *s++ = 'A';
91 s = gcap_string(s, c);
92 }
93
94 c = (caps >> CEPH_CAP_SLINK) & 3;
95 if (c) {
96 *s++ = 'L';
97 s = gcap_string(s, c);
98 }
99
100 c = (caps >> CEPH_CAP_SXATTR) & 3;
101 if (c) {
102 *s++ = 'X';
103 s = gcap_string(s, c);
104 }
105
106 c = caps >> CEPH_CAP_SFILE;
107 if (c) {
108 *s++ = 'F';
109 s = gcap_string(s, c);
110 }
111
112 if (s == cap_str[i])
113 *s++ = '-';
114 *s = 0;
115 return cap_str[i];
116}
117
Yehuda Sadeh37151662010-06-17 16:16:12 -0700118void ceph_caps_init(struct ceph_mds_client *mdsc)
Sage Weila8599bd2009-10-06 11:31:12 -0700119{
Yehuda Sadeh37151662010-06-17 16:16:12 -0700120 INIT_LIST_HEAD(&mdsc->caps_list);
121 spin_lock_init(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700122}
123
Yehuda Sadeh37151662010-06-17 16:16:12 -0700124void ceph_caps_finalize(struct ceph_mds_client *mdsc)
Sage Weila8599bd2009-10-06 11:31:12 -0700125{
126 struct ceph_cap *cap;
127
Yehuda Sadeh37151662010-06-17 16:16:12 -0700128 spin_lock(&mdsc->caps_list_lock);
129 while (!list_empty(&mdsc->caps_list)) {
130 cap = list_first_entry(&mdsc->caps_list,
131 struct ceph_cap, caps_item);
Sage Weila8599bd2009-10-06 11:31:12 -0700132 list_del(&cap->caps_item);
133 kmem_cache_free(ceph_cap_cachep, cap);
134 }
Yehuda Sadeh37151662010-06-17 16:16:12 -0700135 mdsc->caps_total_count = 0;
136 mdsc->caps_avail_count = 0;
137 mdsc->caps_use_count = 0;
138 mdsc->caps_reserve_count = 0;
139 mdsc->caps_min_count = 0;
140 spin_unlock(&mdsc->caps_list_lock);
Sage Weil85ccce42010-02-17 10:02:43 -0800141}
142
Yehuda Sadeh37151662010-06-17 16:16:12 -0700143void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta)
Sage Weil85ccce42010-02-17 10:02:43 -0800144{
Yehuda Sadeh37151662010-06-17 16:16:12 -0700145 spin_lock(&mdsc->caps_list_lock);
146 mdsc->caps_min_count += delta;
147 BUG_ON(mdsc->caps_min_count < 0);
148 spin_unlock(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700149}
150
majianpeng93faca62013-06-26 11:15:27 +0800151void ceph_reserve_caps(struct ceph_mds_client *mdsc,
Yehuda Sadeh37151662010-06-17 16:16:12 -0700152 struct ceph_cap_reservation *ctx, int need)
Sage Weila8599bd2009-10-06 11:31:12 -0700153{
154 int i;
155 struct ceph_cap *cap;
156 int have;
157 int alloc = 0;
158 LIST_HEAD(newcaps);
Sage Weila8599bd2009-10-06 11:31:12 -0700159
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);
majianpeng93faca62013-06-26 11:15:27 +0800177 if (!cap)
178 break;
Sage Weila8599bd2009-10-06 11:31:12 -0700179 list_add(&cap->caps_item, &newcaps);
180 alloc++;
181 }
majianpeng93faca62013-06-26 11:15:27 +0800182 /* we didn't manage to reserve as much as we needed */
183 if (have + alloc != need)
184 pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
185 ctx, need, have + alloc);
Sage Weila8599bd2009-10-06 11:31:12 -0700186
Yehuda Sadeh37151662010-06-17 16:16:12 -0700187 spin_lock(&mdsc->caps_list_lock);
188 mdsc->caps_total_count += alloc;
189 mdsc->caps_reserve_count += alloc;
190 list_splice(&newcaps, &mdsc->caps_list);
Sage Weila8599bd2009-10-06 11:31:12 -0700191
Yehuda Sadeh37151662010-06-17 16:16:12 -0700192 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
193 mdsc->caps_reserve_count +
194 mdsc->caps_avail_count);
195 spin_unlock(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700196
197 ctx->count = need;
198 dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
Yehuda Sadeh37151662010-06-17 16:16:12 -0700199 ctx, mdsc->caps_total_count, mdsc->caps_use_count,
200 mdsc->caps_reserve_count, mdsc->caps_avail_count);
Sage Weila8599bd2009-10-06 11:31:12 -0700201}
202
Yehuda Sadeh37151662010-06-17 16:16:12 -0700203int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
204 struct ceph_cap_reservation *ctx)
Sage Weila8599bd2009-10-06 11:31:12 -0700205{
206 dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
207 if (ctx->count) {
Yehuda Sadeh37151662010-06-17 16:16:12 -0700208 spin_lock(&mdsc->caps_list_lock);
209 BUG_ON(mdsc->caps_reserve_count < ctx->count);
210 mdsc->caps_reserve_count -= ctx->count;
211 mdsc->caps_avail_count += ctx->count;
Sage Weila8599bd2009-10-06 11:31:12 -0700212 ctx->count = 0;
213 dout("unreserve caps %d = %d used + %d resv + %d avail\n",
Yehuda Sadeh37151662010-06-17 16:16:12 -0700214 mdsc->caps_total_count, mdsc->caps_use_count,
215 mdsc->caps_reserve_count, mdsc->caps_avail_count);
216 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
217 mdsc->caps_reserve_count +
218 mdsc->caps_avail_count);
219 spin_unlock(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700220 }
221 return 0;
222}
223
Yehuda Sadeh37151662010-06-17 16:16:12 -0700224static struct ceph_cap *get_cap(struct ceph_mds_client *mdsc,
225 struct ceph_cap_reservation *ctx)
Sage Weila8599bd2009-10-06 11:31:12 -0700226{
227 struct ceph_cap *cap = NULL;
228
229 /* temporary, until we do something about cap import/export */
Sage Weil443b3762010-06-29 09:28:39 -0700230 if (!ctx) {
231 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
232 if (cap) {
Yan, Zheng4d1d0532012-11-03 10:32:37 +0800233 spin_lock(&mdsc->caps_list_lock);
Yehuda Sadeh37151662010-06-17 16:16:12 -0700234 mdsc->caps_use_count++;
235 mdsc->caps_total_count++;
Yan, Zheng4d1d0532012-11-03 10:32:37 +0800236 spin_unlock(&mdsc->caps_list_lock);
Sage Weil443b3762010-06-29 09:28:39 -0700237 }
238 return cap;
239 }
Sage Weila8599bd2009-10-06 11:31:12 -0700240
Yehuda Sadeh37151662010-06-17 16:16:12 -0700241 spin_lock(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700242 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
Yehuda Sadeh37151662010-06-17 16:16:12 -0700243 ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
244 mdsc->caps_reserve_count, mdsc->caps_avail_count);
Sage Weila8599bd2009-10-06 11:31:12 -0700245 BUG_ON(!ctx->count);
Yehuda Sadeh37151662010-06-17 16:16:12 -0700246 BUG_ON(ctx->count > mdsc->caps_reserve_count);
247 BUG_ON(list_empty(&mdsc->caps_list));
Sage Weila8599bd2009-10-06 11:31:12 -0700248
249 ctx->count--;
Yehuda Sadeh37151662010-06-17 16:16:12 -0700250 mdsc->caps_reserve_count--;
251 mdsc->caps_use_count++;
Sage Weila8599bd2009-10-06 11:31:12 -0700252
Yehuda Sadeh37151662010-06-17 16:16:12 -0700253 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
Sage Weila8599bd2009-10-06 11:31:12 -0700254 list_del(&cap->caps_item);
255
Yehuda Sadeh37151662010-06-17 16:16:12 -0700256 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
257 mdsc->caps_reserve_count + mdsc->caps_avail_count);
258 spin_unlock(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700259 return cap;
260}
261
Yehuda Sadeh37151662010-06-17 16:16:12 -0700262void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
Sage Weila8599bd2009-10-06 11:31:12 -0700263{
Yehuda Sadeh37151662010-06-17 16:16:12 -0700264 spin_lock(&mdsc->caps_list_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -0800265 dout("put_cap %p %d = %d used + %d resv + %d avail\n",
Yehuda Sadeh37151662010-06-17 16:16:12 -0700266 cap, mdsc->caps_total_count, mdsc->caps_use_count,
267 mdsc->caps_reserve_count, mdsc->caps_avail_count);
268 mdsc->caps_use_count--;
Sage Weila8599bd2009-10-06 11:31:12 -0700269 /*
Sage Weil85ccce42010-02-17 10:02:43 -0800270 * Keep some preallocated caps around (ceph_min_count), to
271 * avoid lots of free/alloc churn.
Sage Weila8599bd2009-10-06 11:31:12 -0700272 */
Yehuda Sadeh37151662010-06-17 16:16:12 -0700273 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
274 mdsc->caps_min_count) {
275 mdsc->caps_total_count--;
Sage Weila8599bd2009-10-06 11:31:12 -0700276 kmem_cache_free(ceph_cap_cachep, cap);
277 } else {
Yehuda Sadeh37151662010-06-17 16:16:12 -0700278 mdsc->caps_avail_count++;
279 list_add(&cap->caps_item, &mdsc->caps_list);
Sage Weila8599bd2009-10-06 11:31:12 -0700280 }
281
Yehuda Sadeh37151662010-06-17 16:16:12 -0700282 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
283 mdsc->caps_reserve_count + mdsc->caps_avail_count);
284 spin_unlock(&mdsc->caps_list_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700285}
286
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700287void ceph_reservation_status(struct ceph_fs_client *fsc,
Sage Weil85ccce42010-02-17 10:02:43 -0800288 int *total, int *avail, int *used, int *reserved,
289 int *min)
Sage Weila8599bd2009-10-06 11:31:12 -0700290{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700291 struct ceph_mds_client *mdsc = fsc->mdsc;
Yehuda Sadeh37151662010-06-17 16:16:12 -0700292
Sage Weila8599bd2009-10-06 11:31:12 -0700293 if (total)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700294 *total = mdsc->caps_total_count;
Sage Weila8599bd2009-10-06 11:31:12 -0700295 if (avail)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700296 *avail = mdsc->caps_avail_count;
Sage Weila8599bd2009-10-06 11:31:12 -0700297 if (used)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700298 *used = mdsc->caps_use_count;
Sage Weila8599bd2009-10-06 11:31:12 -0700299 if (reserved)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700300 *reserved = mdsc->caps_reserve_count;
Sage Weil85ccce42010-02-17 10:02:43 -0800301 if (min)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700302 *min = mdsc->caps_min_count;
Sage Weila8599bd2009-10-06 11:31:12 -0700303}
304
305/*
306 * Find ceph_cap for given mds, if any.
307 *
Sage Weilbe655592011-11-30 09:47:09 -0800308 * Called with i_ceph_lock held.
Sage Weila8599bd2009-10-06 11:31:12 -0700309 */
310static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
311{
312 struct ceph_cap *cap;
313 struct rb_node *n = ci->i_caps.rb_node;
314
315 while (n) {
316 cap = rb_entry(n, struct ceph_cap, ci_node);
317 if (mds < cap->mds)
318 n = n->rb_left;
319 else if (mds > cap->mds)
320 n = n->rb_right;
321 else
322 return cap;
323 }
324 return NULL;
325}
326
Greg Farnum2bc50252010-06-30 12:44:34 -0700327struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
328{
329 struct ceph_cap *cap;
330
Sage Weilbe655592011-11-30 09:47:09 -0800331 spin_lock(&ci->i_ceph_lock);
Greg Farnum2bc50252010-06-30 12:44:34 -0700332 cap = __get_cap_for_mds(ci, mds);
Sage Weilbe655592011-11-30 09:47:09 -0800333 spin_unlock(&ci->i_ceph_lock);
Greg Farnum2bc50252010-06-30 12:44:34 -0700334 return cap;
335}
336
Sage Weila8599bd2009-10-06 11:31:12 -0700337/*
Sage Weil33caad32010-05-26 14:31:27 -0700338 * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
Sage Weila8599bd2009-10-06 11:31:12 -0700339 */
Sage Weilca81f3f2010-06-10 14:21:36 -0700340static int __ceph_get_cap_mds(struct ceph_inode_info *ci)
Sage Weila8599bd2009-10-06 11:31:12 -0700341{
342 struct ceph_cap *cap;
343 int mds = -1;
344 struct rb_node *p;
345
Sage Weil33caad32010-05-26 14:31:27 -0700346 /* prefer mds with WR|BUFFER|EXCL caps */
Sage Weila8599bd2009-10-06 11:31:12 -0700347 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
348 cap = rb_entry(p, struct ceph_cap, ci_node);
349 mds = cap->mds;
Sage Weila8599bd2009-10-06 11:31:12 -0700350 if (cap->issued & (CEPH_CAP_FILE_WR |
351 CEPH_CAP_FILE_BUFFER |
352 CEPH_CAP_FILE_EXCL))
353 break;
354 }
355 return mds;
356}
357
358int ceph_get_cap_mds(struct inode *inode)
359{
Sage Weilbe655592011-11-30 09:47:09 -0800360 struct ceph_inode_info *ci = ceph_inode(inode);
Sage Weila8599bd2009-10-06 11:31:12 -0700361 int mds;
Sage Weilbe655592011-11-30 09:47:09 -0800362 spin_lock(&ci->i_ceph_lock);
Sage Weilca81f3f2010-06-10 14:21:36 -0700363 mds = __ceph_get_cap_mds(ceph_inode(inode));
Sage Weilbe655592011-11-30 09:47:09 -0800364 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700365 return mds;
366}
367
368/*
Sage Weilbe655592011-11-30 09:47:09 -0800369 * Called under i_ceph_lock.
Sage Weila8599bd2009-10-06 11:31:12 -0700370 */
371static void __insert_cap_node(struct ceph_inode_info *ci,
372 struct ceph_cap *new)
373{
374 struct rb_node **p = &ci->i_caps.rb_node;
375 struct rb_node *parent = NULL;
376 struct ceph_cap *cap = NULL;
377
378 while (*p) {
379 parent = *p;
380 cap = rb_entry(parent, struct ceph_cap, ci_node);
381 if (new->mds < cap->mds)
382 p = &(*p)->rb_left;
383 else if (new->mds > cap->mds)
384 p = &(*p)->rb_right;
385 else
386 BUG();
387 }
388
389 rb_link_node(&new->ci_node, parent, p);
390 rb_insert_color(&new->ci_node, &ci->i_caps);
391}
392
393/*
394 * (re)set cap hold timeouts, which control the delayed release
395 * of unused caps back to the MDS. Should be called on cap use.
396 */
397static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
398 struct ceph_inode_info *ci)
399{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700400 struct ceph_mount_options *ma = mdsc->fsc->mount_options;
Sage Weila8599bd2009-10-06 11:31:12 -0700401
402 ci->i_hold_caps_min = round_jiffies(jiffies +
403 ma->caps_wanted_delay_min * HZ);
404 ci->i_hold_caps_max = round_jiffies(jiffies +
405 ma->caps_wanted_delay_max * HZ);
406 dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
407 ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
408}
409
410/*
411 * (Re)queue cap at the end of the delayed cap release list.
412 *
413 * If I_FLUSH is set, leave the inode at the front of the list.
414 *
Sage Weilbe655592011-11-30 09:47:09 -0800415 * Caller holds i_ceph_lock
Sage Weila8599bd2009-10-06 11:31:12 -0700416 * -> we take mdsc->cap_delay_lock
417 */
418static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
419 struct ceph_inode_info *ci)
420{
421 __cap_set_timeouts(mdsc, ci);
422 dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
423 ci->i_ceph_flags, ci->i_hold_caps_max);
424 if (!mdsc->stopping) {
425 spin_lock(&mdsc->cap_delay_lock);
426 if (!list_empty(&ci->i_cap_delay_list)) {
427 if (ci->i_ceph_flags & CEPH_I_FLUSH)
428 goto no_change;
429 list_del_init(&ci->i_cap_delay_list);
430 }
431 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
432no_change:
433 spin_unlock(&mdsc->cap_delay_lock);
434 }
435}
436
437/*
438 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
439 * indicating we should send a cap message to flush dirty metadata
440 * asap, and move to the front of the delayed cap list.
441 */
442static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
443 struct ceph_inode_info *ci)
444{
445 dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
446 spin_lock(&mdsc->cap_delay_lock);
447 ci->i_ceph_flags |= CEPH_I_FLUSH;
448 if (!list_empty(&ci->i_cap_delay_list))
449 list_del_init(&ci->i_cap_delay_list);
450 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
451 spin_unlock(&mdsc->cap_delay_lock);
452}
453
454/*
455 * Cancel delayed work on cap.
456 *
Sage Weilbe655592011-11-30 09:47:09 -0800457 * Caller must hold i_ceph_lock.
Sage Weila8599bd2009-10-06 11:31:12 -0700458 */
459static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
460 struct ceph_inode_info *ci)
461{
462 dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
463 if (list_empty(&ci->i_cap_delay_list))
464 return;
465 spin_lock(&mdsc->cap_delay_lock);
466 list_del_init(&ci->i_cap_delay_list);
467 spin_unlock(&mdsc->cap_delay_lock);
468}
469
470/*
471 * Common issue checks for add_cap, handle_cap_grant.
472 */
473static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
474 unsigned issued)
475{
476 unsigned had = __ceph_caps_issued(ci, NULL);
477
478 /*
479 * Each time we receive FILE_CACHE anew, we increment
480 * i_rdcache_gen.
481 */
Sage Weil29625072010-05-27 10:40:43 -0700482 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
Milosz Tanski99ccbd22013-08-21 17:29:54 -0400483 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) {
Sage Weila8599bd2009-10-06 11:31:12 -0700484 ci->i_rdcache_gen++;
Milosz Tanski99ccbd22013-08-21 17:29:54 -0400485 }
Sage Weila8599bd2009-10-06 11:31:12 -0700486
487 /*
Yan, Zheng2f276c52013-03-13 19:44:32 +0800488 * if we are newly issued FILE_SHARED, mark dir not complete; we
Sage Weila8599bd2009-10-06 11:31:12 -0700489 * don't know what happened to this directory while we didn't
490 * have the cap.
491 */
492 if ((issued & CEPH_CAP_FILE_SHARED) &&
493 (had & CEPH_CAP_FILE_SHARED) == 0) {
494 ci->i_shared_gen++;
Yan, Zhenga8673d62013-02-18 16:38:14 +0800495 if (S_ISDIR(ci->vfs_inode.i_mode)) {
496 dout(" marking %p NOT complete\n", &ci->vfs_inode);
Yan, Zheng2f276c52013-03-13 19:44:32 +0800497 __ceph_dir_clear_complete(ci);
Yan, Zhenga8673d62013-02-18 16:38:14 +0800498 }
Sage Weila8599bd2009-10-06 11:31:12 -0700499 }
500}
501
502/*
503 * Add a capability under the given MDS session.
504 *
505 * Caller should hold session snap_rwsem (read) and s_mutex.
506 *
507 * @fmode is the open file mode, if we are opening a file, otherwise
508 * it is < 0. (This is so we can atomically add the cap and add an
509 * open file reference to it.)
510 */
511int ceph_add_cap(struct inode *inode,
512 struct ceph_mds_session *session, u64 cap_id,
513 int fmode, unsigned issued, unsigned wanted,
514 unsigned seq, unsigned mseq, u64 realmino, int flags,
515 struct ceph_cap_reservation *caps_reservation)
516{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700517 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -0700518 struct ceph_inode_info *ci = ceph_inode(inode);
519 struct ceph_cap *new_cap = NULL;
520 struct ceph_cap *cap;
521 int mds = session->s_mds;
522 int actual_wanted;
523
524 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
525 session->s_mds, cap_id, ceph_cap_string(issued), seq);
526
527 /*
528 * If we are opening the file, include file mode wanted bits
529 * in wanted.
530 */
531 if (fmode >= 0)
532 wanted |= ceph_caps_for_mode(fmode);
533
534retry:
Sage Weilbe655592011-11-30 09:47:09 -0800535 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700536 cap = __get_cap_for_mds(ci, mds);
537 if (!cap) {
538 if (new_cap) {
539 cap = new_cap;
540 new_cap = NULL;
541 } else {
Sage Weilbe655592011-11-30 09:47:09 -0800542 spin_unlock(&ci->i_ceph_lock);
Yehuda Sadeh37151662010-06-17 16:16:12 -0700543 new_cap = get_cap(mdsc, caps_reservation);
Sage Weila8599bd2009-10-06 11:31:12 -0700544 if (new_cap == NULL)
545 return -ENOMEM;
546 goto retry;
547 }
548
549 cap->issued = 0;
550 cap->implemented = 0;
551 cap->mds = mds;
552 cap->mds_wanted = 0;
Yan, Zheng964266c2013-02-27 09:26:09 +0800553 cap->mseq = 0;
Sage Weila8599bd2009-10-06 11:31:12 -0700554
555 cap->ci = ci;
556 __insert_cap_node(ci, cap);
557
Sage Weila8599bd2009-10-06 11:31:12 -0700558 /* add to session cap list */
559 cap->session = session;
560 spin_lock(&session->s_cap_lock);
561 list_add_tail(&cap->session_caps, &session->s_caps);
562 session->s_nr_caps++;
563 spin_unlock(&session->s_cap_lock);
Yan, Zheng11df2df2013-11-24 14:44:38 +0800564 } else {
565 if (new_cap)
566 ceph_put_cap(mdsc, new_cap);
567
568 /*
569 * auth mds of the inode changed. we received the cap export
570 * message, but still haven't received the cap import message.
571 * handle_cap_export() updated the new auth MDS' cap.
572 *
573 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
574 * a message that was send before the cap import message. So
575 * don't remove caps.
576 */
577 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
578 WARN_ON(cap != ci->i_auth_cap);
579 WARN_ON(cap->cap_id != cap_id);
580 seq = cap->seq;
581 mseq = cap->mseq;
582 issued |= cap->issued;
583 flags |= CEPH_CAP_FLAG_AUTH;
584 }
585 }
Sage Weila8599bd2009-10-06 11:31:12 -0700586
587 if (!ci->i_snap_realm) {
588 /*
589 * add this inode to the appropriate snap realm
590 */
591 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
592 realmino);
593 if (realm) {
594 ceph_get_snap_realm(mdsc, realm);
595 spin_lock(&realm->inodes_with_caps_lock);
596 ci->i_snap_realm = realm;
597 list_add(&ci->i_snap_realm_item,
598 &realm->inodes_with_caps);
599 spin_unlock(&realm->inodes_with_caps_lock);
600 } else {
601 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
602 realmino);
Sage Weilb8cd07e2010-07-16 12:00:02 -0700603 WARN_ON(!realm);
Sage Weila8599bd2009-10-06 11:31:12 -0700604 }
605 }
606
607 __check_cap_issue(ci, cap, issued);
608
609 /*
610 * If we are issued caps we don't want, or the mds' wanted
611 * value appears to be off, queue a check so we'll release
612 * later and/or update the mds wanted value.
613 */
614 actual_wanted = __ceph_caps_wanted(ci);
615 if ((wanted & ~actual_wanted) ||
616 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
617 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
618 ceph_cap_string(issued), ceph_cap_string(wanted),
619 ceph_cap_string(actual_wanted));
620 __cap_delay_requeue(mdsc, ci);
621 }
622
Yan, Zhengb8c2f3a2013-05-31 16:37:11 +0800623 if (flags & CEPH_CAP_FLAG_AUTH) {
624 if (ci->i_auth_cap == NULL ||
Yan, Zhengd9ffc4f2014-03-18 10:15:29 +0800625 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
Yan, Zhengb8c2f3a2013-05-31 16:37:11 +0800626 ci->i_auth_cap = cap;
Yan, Zhengd9ffc4f2014-03-18 10:15:29 +0800627 cap->mds_wanted = wanted;
628 }
Yan, Zheng4ee6a912013-11-24 14:43:46 +0800629 ci->i_cap_exporting_issued = 0;
Yan, Zheng11df2df2013-11-24 14:44:38 +0800630 } else {
631 WARN_ON(ci->i_auth_cap == cap);
Yan, Zheng8a92a112013-01-04 14:28:07 +0800632 }
Sage Weila8599bd2009-10-06 11:31:12 -0700633
634 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
635 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
636 ceph_cap_string(issued|cap->issued), seq, mds);
637 cap->cap_id = cap_id;
638 cap->issued = issued;
639 cap->implemented |= issued;
Yan, Zhengd1b87802013-11-13 14:47:19 +0800640 if (ceph_seq_cmp(mseq, cap->mseq) > 0)
Yan, Zheng964266c2013-02-27 09:26:09 +0800641 cap->mds_wanted = wanted;
642 else
643 cap->mds_wanted |= wanted;
Sage Weila8599bd2009-10-06 11:31:12 -0700644 cap->seq = seq;
645 cap->issue_seq = seq;
646 cap->mseq = mseq;
Sage Weil685f9a5d2009-11-09 12:05:48 -0800647 cap->cap_gen = session->s_cap_gen;
Sage Weila8599bd2009-10-06 11:31:12 -0700648
649 if (fmode >= 0)
650 __ceph_get_fmode(ci, fmode);
Sage Weilbe655592011-11-30 09:47:09 -0800651 spin_unlock(&ci->i_ceph_lock);
Yehuda Sadeh03066f22010-07-27 13:11:08 -0700652 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -0700653 return 0;
654}
655
656/*
657 * Return true if cap has not timed out and belongs to the current
658 * generation of the MDS session (i.e. has not gone 'stale' due to
659 * us losing touch with the mds).
660 */
661static int __cap_is_valid(struct ceph_cap *cap)
662{
663 unsigned long ttl;
Sage Weilcdac8302009-11-10 16:02:23 -0800664 u32 gen;
Sage Weila8599bd2009-10-06 11:31:12 -0700665
Alex Elderd8fb02a2012-01-12 17:48:10 -0800666 spin_lock(&cap->session->s_gen_ttl_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700667 gen = cap->session->s_cap_gen;
668 ttl = cap->session->s_cap_ttl;
Alex Elderd8fb02a2012-01-12 17:48:10 -0800669 spin_unlock(&cap->session->s_gen_ttl_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700670
Sage Weil685f9a5d2009-11-09 12:05:48 -0800671 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
Sage Weila8599bd2009-10-06 11:31:12 -0700672 dout("__cap_is_valid %p cap %p issued %s "
673 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
Sage Weil685f9a5d2009-11-09 12:05:48 -0800674 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
Sage Weila8599bd2009-10-06 11:31:12 -0700675 return 0;
676 }
677
678 return 1;
679}
680
681/*
682 * Return set of valid cap bits issued to us. Note that caps time
683 * out, and may be invalidated in bulk if the client session times out
684 * and session->s_cap_gen is bumped.
685 */
686int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
687{
Sage Weil7af8f1e2010-03-01 15:17:34 -0800688 int have = ci->i_snap_caps | ci->i_cap_exporting_issued;
Sage Weila8599bd2009-10-06 11:31:12 -0700689 struct ceph_cap *cap;
690 struct rb_node *p;
691
692 if (implemented)
693 *implemented = 0;
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_is_valid(cap))
697 continue;
698 dout("__ceph_caps_issued %p cap %p issued %s\n",
699 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
700 have |= cap->issued;
701 if (implemented)
702 *implemented |= cap->implemented;
703 }
Yan, Zhengb1530f52013-07-02 12:40:20 +0800704 /*
705 * exclude caps issued by non-auth MDS, but are been revoking
706 * by the auth MDS. The non-auth MDS should be revoking/exporting
707 * these caps, but the message is delayed.
708 */
709 if (ci->i_auth_cap) {
710 cap = ci->i_auth_cap;
711 have &= ~cap->implemented | cap->issued;
712 }
Sage Weila8599bd2009-10-06 11:31:12 -0700713 return have;
714}
715
716/*
717 * Get cap bits issued by caps other than @ocap
718 */
719int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
720{
721 int have = ci->i_snap_caps;
722 struct ceph_cap *cap;
723 struct rb_node *p;
724
725 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
726 cap = rb_entry(p, struct ceph_cap, ci_node);
727 if (cap == ocap)
728 continue;
729 if (!__cap_is_valid(cap))
730 continue;
731 have |= cap->issued;
732 }
733 return have;
734}
735
736/*
737 * Move a cap to the end of the LRU (oldest caps at list head, newest
738 * at list tail).
739 */
740static void __touch_cap(struct ceph_cap *cap)
741{
742 struct ceph_mds_session *s = cap->session;
743
Sage Weila8599bd2009-10-06 11:31:12 -0700744 spin_lock(&s->s_cap_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -0800745 if (s->s_cap_iterator == NULL) {
Sage Weil5dacf092009-12-21 20:40:34 -0800746 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
747 s->s_mds);
748 list_move_tail(&cap->session_caps, &s->s_caps);
749 } else {
750 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
751 &cap->ci->vfs_inode, cap, s->s_mds);
752 }
Sage Weila8599bd2009-10-06 11:31:12 -0700753 spin_unlock(&s->s_cap_lock);
754}
755
756/*
757 * Check if we hold the given mask. If so, move the cap(s) to the
758 * front of their respective LRUs. (This is the preferred way for
759 * callers to check for caps they want.)
760 */
761int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
762{
763 struct ceph_cap *cap;
764 struct rb_node *p;
765 int have = ci->i_snap_caps;
766
767 if ((have & mask) == mask) {
768 dout("__ceph_caps_issued_mask %p snap issued %s"
769 " (mask %s)\n", &ci->vfs_inode,
770 ceph_cap_string(have),
771 ceph_cap_string(mask));
772 return 1;
773 }
774
775 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
776 cap = rb_entry(p, struct ceph_cap, ci_node);
777 if (!__cap_is_valid(cap))
778 continue;
779 if ((cap->issued & mask) == mask) {
780 dout("__ceph_caps_issued_mask %p cap %p issued %s"
781 " (mask %s)\n", &ci->vfs_inode, cap,
782 ceph_cap_string(cap->issued),
783 ceph_cap_string(mask));
784 if (touch)
785 __touch_cap(cap);
786 return 1;
787 }
788
789 /* does a combination of caps satisfy mask? */
790 have |= cap->issued;
791 if ((have & mask) == mask) {
792 dout("__ceph_caps_issued_mask %p combo issued %s"
793 " (mask %s)\n", &ci->vfs_inode,
794 ceph_cap_string(cap->issued),
795 ceph_cap_string(mask));
796 if (touch) {
797 struct rb_node *q;
798
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300799 /* touch this + preceding caps */
Sage Weila8599bd2009-10-06 11:31:12 -0700800 __touch_cap(cap);
801 for (q = rb_first(&ci->i_caps); q != p;
802 q = rb_next(q)) {
803 cap = rb_entry(q, struct ceph_cap,
804 ci_node);
805 if (!__cap_is_valid(cap))
806 continue;
807 __touch_cap(cap);
808 }
809 }
810 return 1;
811 }
812 }
813
814 return 0;
815}
816
817/*
818 * Return true if mask caps are currently being revoked by an MDS.
819 */
Yan, Zheng6ee6b9532013-07-02 12:40:21 +0800820int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
821 struct ceph_cap *ocap, int mask)
822{
823 struct ceph_cap *cap;
824 struct rb_node *p;
825
826 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
827 cap = rb_entry(p, struct ceph_cap, ci_node);
Yan, Zheng9563f882013-11-22 13:50:45 +0800828 if (cap != ocap &&
Yan, Zheng6ee6b9532013-07-02 12:40:21 +0800829 (cap->implemented & ~cap->issued & mask))
830 return 1;
831 }
832 return 0;
833}
834
Sage Weila8599bd2009-10-06 11:31:12 -0700835int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
836{
837 struct inode *inode = &ci->vfs_inode;
Yan, Zheng6ee6b9532013-07-02 12:40:21 +0800838 int ret;
Sage Weila8599bd2009-10-06 11:31:12 -0700839
Sage Weilbe655592011-11-30 09:47:09 -0800840 spin_lock(&ci->i_ceph_lock);
Yan, Zheng6ee6b9532013-07-02 12:40:21 +0800841 ret = __ceph_caps_revoking_other(ci, NULL, mask);
Sage Weilbe655592011-11-30 09:47:09 -0800842 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700843 dout("ceph_caps_revoking %p %s = %d\n", inode,
844 ceph_cap_string(mask), ret);
845 return ret;
846}
847
848int __ceph_caps_used(struct ceph_inode_info *ci)
849{
850 int used = 0;
851 if (ci->i_pin_ref)
852 used |= CEPH_CAP_PIN;
853 if (ci->i_rd_ref)
854 used |= CEPH_CAP_FILE_RD;
Sage Weila43fb732010-09-17 09:54:08 -0700855 if (ci->i_rdcache_ref || ci->vfs_inode.i_data.nrpages)
Sage Weila8599bd2009-10-06 11:31:12 -0700856 used |= CEPH_CAP_FILE_CACHE;
857 if (ci->i_wr_ref)
858 used |= CEPH_CAP_FILE_WR;
Henry C Changd3d07202011-05-11 10:29:54 +0000859 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
Sage Weila8599bd2009-10-06 11:31:12 -0700860 used |= CEPH_CAP_FILE_BUFFER;
861 return used;
862}
863
864/*
865 * wanted, by virtue of open file modes
866 */
867int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
868{
869 int want = 0;
870 int mode;
Sage Weil33caad32010-05-26 14:31:27 -0700871 for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++)
Sage Weila8599bd2009-10-06 11:31:12 -0700872 if (ci->i_nr_by_mode[mode])
873 want |= ceph_caps_for_mode(mode);
874 return want;
875}
876
877/*
878 * Return caps we have registered with the MDS(s) as 'wanted'.
879 */
880int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
881{
882 struct ceph_cap *cap;
883 struct rb_node *p;
884 int mds_wanted = 0;
885
886 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
887 cap = rb_entry(p, struct ceph_cap, ci_node);
888 if (!__cap_is_valid(cap))
889 continue;
Yan, Zhenga2550602014-03-08 09:51:45 +0800890 if (cap == ci->i_auth_cap)
891 mds_wanted |= cap->mds_wanted;
892 else
893 mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
Sage Weila8599bd2009-10-06 11:31:12 -0700894 }
895 return mds_wanted;
896}
897
898/*
Sage Weilbe655592011-11-30 09:47:09 -0800899 * called under i_ceph_lock
Sage Weila8599bd2009-10-06 11:31:12 -0700900 */
901static int __ceph_is_any_caps(struct ceph_inode_info *ci)
902{
Yan, Zheng11df2df2013-11-24 14:44:38 +0800903 return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_issued;
Sage Weila8599bd2009-10-06 11:31:12 -0700904}
905
Yan, Zheng9215aee2013-11-30 12:47:41 +0800906int ceph_is_any_caps(struct inode *inode)
907{
908 struct ceph_inode_info *ci = ceph_inode(inode);
909 int ret;
910
911 spin_lock(&ci->i_ceph_lock);
912 ret = __ceph_is_any_caps(ci);
913 spin_unlock(&ci->i_ceph_lock);
914
915 return ret;
916}
917
Sage Weila8599bd2009-10-06 11:31:12 -0700918/*
Sage Weilf818a732010-05-11 20:56:31 -0700919 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
920 *
Sage Weilbe655592011-11-30 09:47:09 -0800921 * caller should hold i_ceph_lock.
Sage Weila6369742010-02-22 13:59:00 -0800922 * caller will not hold session s_mutex if called from destroy_inode.
Sage Weila8599bd2009-10-06 11:31:12 -0700923 */
Yan, Zhenga096b092013-09-22 10:15:58 +0800924void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
Sage Weila8599bd2009-10-06 11:31:12 -0700925{
926 struct ceph_mds_session *session = cap->session;
927 struct ceph_inode_info *ci = cap->ci;
Cheng Renquan640ef792010-03-26 17:40:33 +0800928 struct ceph_mds_client *mdsc =
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700929 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
Sage Weilf818a732010-05-11 20:56:31 -0700930 int removed = 0;
Sage Weila8599bd2009-10-06 11:31:12 -0700931
932 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
933
Sage Weil7c1332b2010-02-16 11:39:45 -0800934 /* remove from session list */
935 spin_lock(&session->s_cap_lock);
Yan, Zheng99a9c272013-09-22 11:08:14 +0800936 /*
937 * s_cap_reconnect is protected by s_cap_lock. no one changes
938 * s_cap_gen while session is in the reconnect state.
939 */
940 if (queue_release &&
941 (!session->s_cap_reconnect ||
942 cap->cap_gen == session->s_cap_gen))
Yan, Zhenga096b092013-09-22 10:15:58 +0800943 __queue_cap_release(session, ci->i_vino.ino, cap->cap_id,
944 cap->mseq, cap->issue_seq);
945
Sage Weil7c1332b2010-02-16 11:39:45 -0800946 if (session->s_cap_iterator == cap) {
947 /* not yet, we are iterating over this very cap */
948 dout("__ceph_remove_cap delaying %p removal from session %p\n",
949 cap, cap->session);
950 } else {
951 list_del_init(&cap->session_caps);
952 session->s_nr_caps--;
953 cap->session = NULL;
Sage Weilf818a732010-05-11 20:56:31 -0700954 removed = 1;
Sage Weil7c1332b2010-02-16 11:39:45 -0800955 }
Sage Weilf818a732010-05-11 20:56:31 -0700956 /* protect backpointer with s_cap_lock: see iterate_session_caps */
957 cap->ci = NULL;
Sage Weil7c1332b2010-02-16 11:39:45 -0800958 spin_unlock(&session->s_cap_lock);
959
Sage Weilf818a732010-05-11 20:56:31 -0700960 /* remove from inode list */
961 rb_erase(&cap->ci_node, &ci->i_caps);
962 if (ci->i_auth_cap == cap)
963 ci->i_auth_cap = NULL;
964
965 if (removed)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700966 ceph_put_cap(mdsc, cap);
Sage Weila8599bd2009-10-06 11:31:12 -0700967
968 if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) {
969 struct ceph_snap_realm *realm = ci->i_snap_realm;
970 spin_lock(&realm->inodes_with_caps_lock);
971 list_del_init(&ci->i_snap_realm_item);
972 ci->i_snap_realm_counter++;
973 ci->i_snap_realm = NULL;
974 spin_unlock(&realm->inodes_with_caps_lock);
975 ceph_put_snap_realm(mdsc, realm);
976 }
977 if (!__ceph_is_any_real_caps(ci))
978 __cap_delay_cancel(mdsc, ci);
979}
980
981/*
982 * Build and send a cap message to the given MDS.
983 *
984 * Caller should be holding s_mutex.
985 */
986static int send_cap_msg(struct ceph_mds_session *session,
987 u64 ino, u64 cid, int op,
988 int caps, int wanted, int dirty,
989 u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq,
990 u64 size, u64 max_size,
991 struct timespec *mtime, struct timespec *atime,
992 u64 time_warp_seq,
Eric W. Biederman05cb11c2013-01-31 02:56:19 -0800993 kuid_t uid, kgid_t gid, umode_t mode,
Sage Weila8599bd2009-10-06 11:31:12 -0700994 u64 xattr_version,
995 struct ceph_buffer *xattrs_buf,
996 u64 follows)
997{
998 struct ceph_mds_caps *fc;
999 struct ceph_msg *msg;
1000
1001 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
1002 " seq %u/%u mseq %u follows %lld size %llu/%llu"
1003 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
1004 cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
1005 ceph_cap_string(dirty),
1006 seq, issue_seq, mseq, follows, size, max_size,
1007 xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
1008
Sage Weilb61c2762011-08-09 15:03:46 -07001009 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), GFP_NOFS, false);
Sage Weila79832f2010-04-01 16:06:19 -07001010 if (!msg)
1011 return -ENOMEM;
Sage Weila8599bd2009-10-06 11:31:12 -07001012
Sage Weil6df058c2009-12-22 11:24:33 -08001013 msg->hdr.tid = cpu_to_le64(flush_tid);
Sage Weila8599bd2009-10-06 11:31:12 -07001014
Sage Weil6df058c2009-12-22 11:24:33 -08001015 fc = msg->front.iov_base;
Sage Weila8599bd2009-10-06 11:31:12 -07001016 memset(fc, 0, sizeof(*fc));
1017
1018 fc->cap_id = cpu_to_le64(cid);
1019 fc->op = cpu_to_le32(op);
1020 fc->seq = cpu_to_le32(seq);
Sage Weila8599bd2009-10-06 11:31:12 -07001021 fc->issue_seq = cpu_to_le32(issue_seq);
1022 fc->migrate_seq = cpu_to_le32(mseq);
1023 fc->caps = cpu_to_le32(caps);
1024 fc->wanted = cpu_to_le32(wanted);
1025 fc->dirty = cpu_to_le32(dirty);
1026 fc->ino = cpu_to_le64(ino);
1027 fc->snap_follows = cpu_to_le64(follows);
1028
1029 fc->size = cpu_to_le64(size);
1030 fc->max_size = cpu_to_le64(max_size);
1031 if (mtime)
1032 ceph_encode_timespec(&fc->mtime, mtime);
1033 if (atime)
1034 ceph_encode_timespec(&fc->atime, atime);
1035 fc->time_warp_seq = cpu_to_le32(time_warp_seq);
1036
Eric W. Biederman05cb11c2013-01-31 02:56:19 -08001037 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, uid));
1038 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, gid));
Sage Weila8599bd2009-10-06 11:31:12 -07001039 fc->mode = cpu_to_le32(mode);
1040
1041 fc->xattr_version = cpu_to_le64(xattr_version);
1042 if (xattrs_buf) {
1043 msg->middle = ceph_buffer_get(xattrs_buf);
1044 fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
1045 msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
1046 }
1047
1048 ceph_con_send(&session->s_con, msg);
1049 return 0;
1050}
1051
Yan, Zhengd40ee0d2013-02-18 13:43:43 +08001052void __queue_cap_release(struct ceph_mds_session *session,
1053 u64 ino, u64 cap_id, u32 migrate_seq,
1054 u32 issue_seq)
Sage Weil3d7ded42010-06-09 16:47:10 -07001055{
1056 struct ceph_msg *msg;
1057 struct ceph_mds_cap_release *head;
1058 struct ceph_mds_cap_item *item;
1059
Sage Weil3d7ded42010-06-09 16:47:10 -07001060 BUG_ON(!session->s_num_cap_releases);
1061 msg = list_first_entry(&session->s_cap_releases,
1062 struct ceph_msg, list_head);
1063
1064 dout(" adding %llx release to mds%d msg %p (%d left)\n",
1065 ino, session->s_mds, msg, session->s_num_cap_releases);
1066
1067 BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE);
1068 head = msg->front.iov_base;
Wei Yongjunb905a7f2012-09-28 12:59:16 +08001069 le32_add_cpu(&head->num, 1);
Sage Weil3d7ded42010-06-09 16:47:10 -07001070 item = msg->front.iov_base + msg->front.iov_len;
1071 item->ino = cpu_to_le64(ino);
1072 item->cap_id = cpu_to_le64(cap_id);
1073 item->migrate_seq = cpu_to_le32(migrate_seq);
1074 item->seq = cpu_to_le32(issue_seq);
1075
1076 session->s_num_cap_releases--;
1077
1078 msg->front.iov_len += sizeof(*item);
1079 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1080 dout(" release msg %p full\n", msg);
1081 list_move_tail(&msg->list_head, &session->s_cap_releases_done);
1082 } else {
1083 dout(" release msg %p at %d/%d (%d)\n", msg,
1084 (int)le32_to_cpu(head->num),
1085 (int)CEPH_CAPS_PER_RELEASE,
1086 (int)msg->front.iov_len);
1087 }
Sage Weil3d7ded42010-06-09 16:47:10 -07001088}
1089
Sage Weila8599bd2009-10-06 11:31:12 -07001090/*
Sage Weila6369742010-02-22 13:59:00 -08001091 * Queue cap releases when an inode is dropped from our cache. Since
Sage Weilbe655592011-11-30 09:47:09 -08001092 * inode is about to be destroyed, there is no need for i_ceph_lock.
Sage Weila8599bd2009-10-06 11:31:12 -07001093 */
1094void ceph_queue_caps_release(struct inode *inode)
1095{
1096 struct ceph_inode_info *ci = ceph_inode(inode);
1097 struct rb_node *p;
1098
Sage Weila8599bd2009-10-06 11:31:12 -07001099 p = rb_first(&ci->i_caps);
1100 while (p) {
1101 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
Sage Weila8599bd2009-10-06 11:31:12 -07001102 p = rb_next(p);
Yan, Zhenga096b092013-09-22 10:15:58 +08001103 __ceph_remove_cap(cap, true);
Sage Weila8599bd2009-10-06 11:31:12 -07001104 }
Sage Weila8599bd2009-10-06 11:31:12 -07001105}
1106
1107/*
1108 * Send a cap msg on the given inode. Update our caps state, then
Sage Weilbe655592011-11-30 09:47:09 -08001109 * drop i_ceph_lock and send the message.
Sage Weila8599bd2009-10-06 11:31:12 -07001110 *
1111 * Make note of max_size reported/requested from mds, revoked caps
1112 * that have now been implemented.
1113 *
1114 * Make half-hearted attempt ot to invalidate page cache if we are
1115 * dropping RDCACHE. Note that this will leave behind locked pages
1116 * that we'll then need to deal with elsewhere.
1117 *
1118 * Return non-zero if delayed release, or we experienced an error
1119 * such that the caller should requeue + retry later.
1120 *
Sage Weilbe655592011-11-30 09:47:09 -08001121 * called with i_ceph_lock, then drops it.
Sage Weila8599bd2009-10-06 11:31:12 -07001122 * caller should hold snap_rwsem (read), s_mutex.
1123 */
1124static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
1125 int op, int used, int want, int retain, int flushing,
1126 unsigned *pflush_tid)
Sage Weilbe655592011-11-30 09:47:09 -08001127 __releases(cap->ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07001128{
1129 struct ceph_inode_info *ci = cap->ci;
1130 struct inode *inode = &ci->vfs_inode;
1131 u64 cap_id = cap->cap_id;
Sage Weil68c28322010-02-09 13:41:47 -08001132 int held, revoking, dropping, keep;
Sage Weila8599bd2009-10-06 11:31:12 -07001133 u64 seq, issue_seq, mseq, time_warp_seq, follows;
1134 u64 size, max_size;
1135 struct timespec mtime, atime;
1136 int wake = 0;
Al Viro5706b272011-07-26 04:52:22 -04001137 umode_t mode;
Eric W. Biederman05cb11c2013-01-31 02:56:19 -08001138 kuid_t uid;
1139 kgid_t gid;
Sage Weila8599bd2009-10-06 11:31:12 -07001140 struct ceph_mds_session *session;
1141 u64 xattr_version = 0;
Sage Weil082afec2010-08-22 15:16:41 -07001142 struct ceph_buffer *xattr_blob = NULL;
Sage Weila8599bd2009-10-06 11:31:12 -07001143 int delayed = 0;
1144 u64 flush_tid = 0;
1145 int i;
1146 int ret;
1147
Sage Weil68c28322010-02-09 13:41:47 -08001148 held = cap->issued | cap->implemented;
1149 revoking = cap->implemented & ~cap->issued;
1150 retain &= ~revoking;
1151 dropping = cap->issued & ~retain;
1152
Sage Weila8599bd2009-10-06 11:31:12 -07001153 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1154 inode, cap, cap->session,
1155 ceph_cap_string(held), ceph_cap_string(held & retain),
1156 ceph_cap_string(revoking));
1157 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1158
1159 session = cap->session;
1160
1161 /* don't release wanted unless we've waited a bit. */
1162 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1163 time_before(jiffies, ci->i_hold_caps_min)) {
1164 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1165 ceph_cap_string(cap->issued),
1166 ceph_cap_string(cap->issued & retain),
1167 ceph_cap_string(cap->mds_wanted),
1168 ceph_cap_string(want));
1169 want |= cap->mds_wanted;
1170 retain |= cap->issued;
1171 delayed = 1;
1172 }
1173 ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
1174
1175 cap->issued &= retain; /* drop bits we don't want */
1176 if (cap->implemented & ~cap->issued) {
1177 /*
1178 * Wake up any waiters on wanted -> needed transition.
1179 * This is due to the weird transition from buffered
1180 * to sync IO... we need to flush dirty pages _before_
1181 * allowing sync writes to avoid reordering.
1182 */
1183 wake = 1;
1184 }
1185 cap->implemented &= cap->issued | used;
1186 cap->mds_wanted = want;
1187
1188 if (flushing) {
1189 /*
1190 * assign a tid for flush operations so we can avoid
1191 * flush1 -> dirty1 -> flush2 -> flushack1 -> mark
1192 * clean type races. track latest tid for every bit
1193 * so we can handle flush AxFw, flush Fw, and have the
1194 * first ack clean Ax.
1195 */
1196 flush_tid = ++ci->i_cap_flush_last_tid;
1197 if (pflush_tid)
1198 *pflush_tid = flush_tid;
1199 dout(" cap_flush_tid %d\n", (int)flush_tid);
1200 for (i = 0; i < CEPH_CAP_BITS; i++)
1201 if (flushing & (1 << i))
1202 ci->i_cap_flush_tid[i] = flush_tid;
Sage Weil7d8cb262010-08-24 08:44:16 -07001203
1204 follows = ci->i_head_snapc->seq;
1205 } else {
1206 follows = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07001207 }
1208
1209 keep = cap->implemented;
1210 seq = cap->seq;
1211 issue_seq = cap->issue_seq;
1212 mseq = cap->mseq;
1213 size = inode->i_size;
1214 ci->i_reported_size = size;
1215 max_size = ci->i_wanted_max_size;
1216 ci->i_requested_max_size = max_size;
1217 mtime = inode->i_mtime;
1218 atime = inode->i_atime;
1219 time_warp_seq = ci->i_time_warp_seq;
Sage Weila8599bd2009-10-06 11:31:12 -07001220 uid = inode->i_uid;
1221 gid = inode->i_gid;
1222 mode = inode->i_mode;
1223
Sage Weil082afec2010-08-22 15:16:41 -07001224 if (flushing & CEPH_CAP_XATTR_EXCL) {
Sage Weila8599bd2009-10-06 11:31:12 -07001225 __ceph_build_xattrs_blob(ci);
Sage Weil082afec2010-08-22 15:16:41 -07001226 xattr_blob = ci->i_xattrs.blob;
1227 xattr_version = ci->i_xattrs.version;
Sage Weila8599bd2009-10-06 11:31:12 -07001228 }
1229
Sage Weilbe655592011-11-30 09:47:09 -08001230 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001231
Sage Weila8599bd2009-10-06 11:31:12 -07001232 ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
1233 op, keep, want, flushing, seq, flush_tid, issue_seq, mseq,
1234 size, max_size, &mtime, &atime, time_warp_seq,
Sage Weil082afec2010-08-22 15:16:41 -07001235 uid, gid, mode, xattr_version, xattr_blob,
Sage Weila8599bd2009-10-06 11:31:12 -07001236 follows);
1237 if (ret < 0) {
1238 dout("error sending cap msg, must requeue %p\n", inode);
1239 delayed = 1;
1240 }
1241
1242 if (wake)
Yehuda Sadeh03066f22010-07-27 13:11:08 -07001243 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07001244
1245 return delayed;
1246}
1247
1248/*
1249 * When a snapshot is taken, clients accumulate dirty metadata on
1250 * inodes with capabilities in ceph_cap_snaps to describe the file
1251 * state at the time the snapshot was taken. This must be flushed
1252 * asynchronously back to the MDS once sync writes complete and dirty
1253 * data is written out.
1254 *
Sage Weile8351242010-09-17 08:03:08 -07001255 * Unless @again is true, skip cap_snaps that were already sent to
1256 * the MDS (i.e., during this session).
1257 *
Sage Weilbe655592011-11-30 09:47:09 -08001258 * Called under i_ceph_lock. Takes s_mutex as needed.
Sage Weila8599bd2009-10-06 11:31:12 -07001259 */
1260void __ceph_flush_snaps(struct ceph_inode_info *ci,
Sage Weile8351242010-09-17 08:03:08 -07001261 struct ceph_mds_session **psession,
1262 int again)
Sage Weilbe655592011-11-30 09:47:09 -08001263 __releases(ci->i_ceph_lock)
1264 __acquires(ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07001265{
1266 struct inode *inode = &ci->vfs_inode;
1267 int mds;
1268 struct ceph_cap_snap *capsnap;
1269 u32 mseq;
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001270 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001271 struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
1272 session->s_mutex */
1273 u64 next_follows = 0; /* keep track of how far we've gotten through the
1274 i_cap_snaps list, and skip these entries next time
1275 around to avoid an infinite loop */
1276
1277 if (psession)
1278 session = *psession;
1279
1280 dout("__flush_snaps %p\n", inode);
1281retry:
1282 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1283 /* avoid an infiniute loop after retry */
1284 if (capsnap->follows < next_follows)
1285 continue;
1286 /*
1287 * we need to wait for sync writes to complete and for dirty
1288 * pages to be written out.
1289 */
1290 if (capsnap->dirty_pages || capsnap->writing)
Sage Weilcfc0bf62010-09-14 15:50:59 -07001291 break;
Sage Weila8599bd2009-10-06 11:31:12 -07001292
Sage Weil819ccbf2010-04-01 09:33:46 -07001293 /*
1294 * if cap writeback already occurred, we should have dropped
1295 * the capsnap in ceph_put_wrbuffer_cap_refs.
1296 */
1297 BUG_ON(capsnap->dirty == 0);
1298
Sage Weila8599bd2009-10-06 11:31:12 -07001299 /* pick mds, take s_mutex */
Sage Weilca81f3f2010-06-10 14:21:36 -07001300 if (ci->i_auth_cap == NULL) {
1301 dout("no auth cap (migrating?), doing nothing\n");
1302 goto out;
1303 }
Sage Weile8351242010-09-17 08:03:08 -07001304
1305 /* only flush each capsnap once */
1306 if (!again && !list_empty(&capsnap->flushing_item)) {
1307 dout("already flushed %p, skipping\n", capsnap);
1308 continue;
1309 }
1310
Sage Weilca81f3f2010-06-10 14:21:36 -07001311 mds = ci->i_auth_cap->session->s_mds;
1312 mseq = ci->i_auth_cap->mseq;
1313
Sage Weila8599bd2009-10-06 11:31:12 -07001314 if (session && session->s_mds != mds) {
1315 dout("oops, wrong session %p mutex\n", session);
1316 mutex_unlock(&session->s_mutex);
1317 ceph_put_mds_session(session);
1318 session = NULL;
1319 }
1320 if (!session) {
Sage Weilbe655592011-11-30 09:47:09 -08001321 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001322 mutex_lock(&mdsc->mutex);
1323 session = __ceph_lookup_mds_session(mdsc, mds);
1324 mutex_unlock(&mdsc->mutex);
1325 if (session) {
1326 dout("inverting session/ino locks on %p\n",
1327 session);
1328 mutex_lock(&session->s_mutex);
1329 }
1330 /*
1331 * if session == NULL, we raced against a cap
Sage Weilca81f3f2010-06-10 14:21:36 -07001332 * deletion or migration. retry, and we'll
1333 * get a better @mds value next time.
Sage Weila8599bd2009-10-06 11:31:12 -07001334 */
Sage Weilbe655592011-11-30 09:47:09 -08001335 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001336 goto retry;
1337 }
1338
1339 capsnap->flush_tid = ++ci->i_cap_flush_last_tid;
1340 atomic_inc(&capsnap->nref);
1341 if (!list_empty(&capsnap->flushing_item))
1342 list_del_init(&capsnap->flushing_item);
1343 list_add_tail(&capsnap->flushing_item,
1344 &session->s_cap_snaps_flushing);
Sage Weilbe655592011-11-30 09:47:09 -08001345 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001346
Sage Weilcfc0bf62010-09-14 15:50:59 -07001347 dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
1348 inode, capsnap, capsnap->follows, capsnap->flush_tid);
Sage Weila8599bd2009-10-06 11:31:12 -07001349 send_cap_msg(session, ceph_vino(inode).ino, 0,
1350 CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
1351 capsnap->dirty, 0, capsnap->flush_tid, 0, mseq,
1352 capsnap->size, 0,
1353 &capsnap->mtime, &capsnap->atime,
1354 capsnap->time_warp_seq,
1355 capsnap->uid, capsnap->gid, capsnap->mode,
Sage Weil4a625be2010-08-22 15:03:56 -07001356 capsnap->xattr_version, capsnap->xattr_blob,
Sage Weila8599bd2009-10-06 11:31:12 -07001357 capsnap->follows);
1358
1359 next_follows = capsnap->follows + 1;
1360 ceph_put_cap_snap(capsnap);
1361
Sage Weilbe655592011-11-30 09:47:09 -08001362 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001363 goto retry;
1364 }
1365
1366 /* we flushed them all; remove this inode from the queue */
1367 spin_lock(&mdsc->snap_flush_lock);
1368 list_del_init(&ci->i_snap_flush_item);
1369 spin_unlock(&mdsc->snap_flush_lock);
1370
Sage Weilca81f3f2010-06-10 14:21:36 -07001371out:
Sage Weila8599bd2009-10-06 11:31:12 -07001372 if (psession)
1373 *psession = session;
1374 else if (session) {
1375 mutex_unlock(&session->s_mutex);
1376 ceph_put_mds_session(session);
1377 }
1378}
1379
1380static void ceph_flush_snaps(struct ceph_inode_info *ci)
1381{
Sage Weilbe655592011-11-30 09:47:09 -08001382 spin_lock(&ci->i_ceph_lock);
Sage Weile8351242010-09-17 08:03:08 -07001383 __ceph_flush_snaps(ci, NULL, 0);
Sage Weilbe655592011-11-30 09:47:09 -08001384 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001385}
1386
1387/*
Sage Weilfca65b42011-05-04 11:33:47 -07001388 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1389 * Caller is then responsible for calling __mark_inode_dirty with the
1390 * returned flags value.
Sage Weil76e3b392009-10-15 18:13:53 -07001391 */
Sage Weilfca65b42011-05-04 11:33:47 -07001392int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask)
Sage Weil76e3b392009-10-15 18:13:53 -07001393{
Cheng Renquan640ef792010-03-26 17:40:33 +08001394 struct ceph_mds_client *mdsc =
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001395 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
Sage Weil76e3b392009-10-15 18:13:53 -07001396 struct inode *inode = &ci->vfs_inode;
1397 int was = ci->i_dirty_caps;
1398 int dirty = 0;
1399
1400 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1401 ceph_cap_string(mask), ceph_cap_string(was),
1402 ceph_cap_string(was | mask));
1403 ci->i_dirty_caps |= mask;
1404 if (was == 0) {
Sage Weil7d8cb262010-08-24 08:44:16 -07001405 if (!ci->i_head_snapc)
1406 ci->i_head_snapc = ceph_get_snap_context(
1407 ci->i_snap_realm->cached_context);
Yan, Zheng06852352012-11-19 10:49:07 +08001408 dout(" inode %p now dirty snapc %p auth cap %p\n",
1409 &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
Yan, Zheng11df2df2013-11-24 14:44:38 +08001410 WARN_ON(!ci->i_auth_cap);
Sage Weil76e3b392009-10-15 18:13:53 -07001411 BUG_ON(!list_empty(&ci->i_dirty_item));
1412 spin_lock(&mdsc->cap_dirty_lock);
Yan, Zheng11df2df2013-11-24 14:44:38 +08001413 list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
Sage Weil76e3b392009-10-15 18:13:53 -07001414 spin_unlock(&mdsc->cap_dirty_lock);
1415 if (ci->i_flushing_caps == 0) {
Sage Weil3772d262011-05-03 09:28:08 -07001416 ihold(inode);
Sage Weil76e3b392009-10-15 18:13:53 -07001417 dirty |= I_DIRTY_SYNC;
1418 }
1419 }
1420 BUG_ON(list_empty(&ci->i_dirty_item));
1421 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1422 (mask & CEPH_CAP_FILE_BUFFER))
1423 dirty |= I_DIRTY_DATASYNC;
Sage Weil76e3b392009-10-15 18:13:53 -07001424 __cap_delay_requeue(mdsc, ci);
Sage Weilfca65b42011-05-04 11:33:47 -07001425 return dirty;
Sage Weil76e3b392009-10-15 18:13:53 -07001426}
1427
1428/*
Sage Weila8599bd2009-10-06 11:31:12 -07001429 * Add dirty inode to the flushing list. Assigned a seq number so we
1430 * can wait for caps to flush without starving.
Sage Weilcdc35f92009-10-14 14:24:19 -07001431 *
Sage Weilbe655592011-11-30 09:47:09 -08001432 * Called under i_ceph_lock.
Sage Weila8599bd2009-10-06 11:31:12 -07001433 */
Sage Weilcdc35f92009-10-14 14:24:19 -07001434static int __mark_caps_flushing(struct inode *inode,
Sage Weila8599bd2009-10-06 11:31:12 -07001435 struct ceph_mds_session *session)
1436{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001437 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001438 struct ceph_inode_info *ci = ceph_inode(inode);
Sage Weilcdc35f92009-10-14 14:24:19 -07001439 int flushing;
Sage Weil50b885b2009-12-01 14:12:07 -08001440
Sage Weilcdc35f92009-10-14 14:24:19 -07001441 BUG_ON(ci->i_dirty_caps == 0);
Sage Weila8599bd2009-10-06 11:31:12 -07001442 BUG_ON(list_empty(&ci->i_dirty_item));
Sage Weilcdc35f92009-10-14 14:24:19 -07001443
1444 flushing = ci->i_dirty_caps;
1445 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1446 ceph_cap_string(flushing),
1447 ceph_cap_string(ci->i_flushing_caps),
1448 ceph_cap_string(ci->i_flushing_caps | flushing));
1449 ci->i_flushing_caps |= flushing;
1450 ci->i_dirty_caps = 0;
Sage Weilafcdaea2009-10-14 14:27:38 -07001451 dout(" inode %p now !dirty\n", inode);
Sage Weilcdc35f92009-10-14 14:24:19 -07001452
Sage Weila8599bd2009-10-06 11:31:12 -07001453 spin_lock(&mdsc->cap_dirty_lock);
Sage Weilafcdaea2009-10-14 14:27:38 -07001454 list_del_init(&ci->i_dirty_item);
1455
1456 ci->i_cap_flush_seq = ++mdsc->cap_flush_seq;
Sage Weila8599bd2009-10-06 11:31:12 -07001457 if (list_empty(&ci->i_flushing_item)) {
1458 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1459 mdsc->num_cap_flushing++;
Sage Weilafcdaea2009-10-14 14:27:38 -07001460 dout(" inode %p now flushing seq %lld\n", inode,
1461 ci->i_cap_flush_seq);
1462 } else {
1463 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1464 dout(" inode %p now flushing (more) seq %lld\n", inode,
Sage Weila8599bd2009-10-06 11:31:12 -07001465 ci->i_cap_flush_seq);
1466 }
1467 spin_unlock(&mdsc->cap_dirty_lock);
Sage Weilcdc35f92009-10-14 14:24:19 -07001468
1469 return flushing;
Sage Weila8599bd2009-10-06 11:31:12 -07001470}
1471
1472/*
Sage Weil5ecad6f2010-02-17 10:43:37 -08001473 * try to invalidate mapping pages without blocking.
1474 */
Sage Weil5ecad6f2010-02-17 10:43:37 -08001475static int try_nonblocking_invalidate(struct inode *inode)
1476{
1477 struct ceph_inode_info *ci = ceph_inode(inode);
1478 u32 invalidating_gen = ci->i_rdcache_gen;
1479
Sage Weilbe655592011-11-30 09:47:09 -08001480 spin_unlock(&ci->i_ceph_lock);
Sage Weil5ecad6f2010-02-17 10:43:37 -08001481 invalidate_mapping_pages(&inode->i_data, 0, -1);
Sage Weilbe655592011-11-30 09:47:09 -08001482 spin_lock(&ci->i_ceph_lock);
Sage Weil5ecad6f2010-02-17 10:43:37 -08001483
Sage Weil18a38192010-09-17 10:46:44 -07001484 if (inode->i_data.nrpages == 0 &&
Sage Weil5ecad6f2010-02-17 10:43:37 -08001485 invalidating_gen == ci->i_rdcache_gen) {
1486 /* success. */
1487 dout("try_nonblocking_invalidate %p success\n", inode);
Sage Weilcd045cb2010-11-04 11:05:05 -07001488 /* save any racing async invalidate some trouble */
1489 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
Sage Weil5ecad6f2010-02-17 10:43:37 -08001490 return 0;
1491 }
1492 dout("try_nonblocking_invalidate %p failed\n", inode);
1493 return -1;
1494}
1495
1496/*
Sage Weila8599bd2009-10-06 11:31:12 -07001497 * Swiss army knife function to examine currently used and wanted
1498 * versus held caps. Release, flush, ack revoked caps to mds as
1499 * appropriate.
1500 *
1501 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1502 * cap release further.
1503 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1504 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1505 * further delay.
1506 */
1507void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1508 struct ceph_mds_session *session)
1509{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001510 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1511 struct ceph_mds_client *mdsc = fsc->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001512 struct inode *inode = &ci->vfs_inode;
1513 struct ceph_cap *cap;
Yan, Zheng395c3122013-01-04 14:37:57 +08001514 int file_wanted, used, cap_used;
Sage Weila8599bd2009-10-06 11:31:12 -07001515 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
Sage Weilcbd03632010-02-09 13:41:18 -08001516 int issued, implemented, want, retain, revoking, flushing = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07001517 int mds = -1; /* keep track of how far we've gone through i_caps list
1518 to avoid an infinite loop on retry */
1519 struct rb_node *p;
1520 int tried_invalidate = 0;
1521 int delayed = 0, sent = 0, force_requeue = 0, num;
Sage Weilcbd03632010-02-09 13:41:18 -08001522 int queue_invalidate = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07001523 int is_delayed = flags & CHECK_CAPS_NODELAY;
1524
1525 /* if we are unmounting, flush any unused caps immediately. */
1526 if (mdsc->stopping)
1527 is_delayed = 1;
1528
Sage Weilbe655592011-11-30 09:47:09 -08001529 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001530
1531 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1532 flags |= CHECK_CAPS_FLUSH;
1533
1534 /* flush snaps first time around only */
1535 if (!list_empty(&ci->i_cap_snaps))
Sage Weile8351242010-09-17 08:03:08 -07001536 __ceph_flush_snaps(ci, &session, 0);
Sage Weila8599bd2009-10-06 11:31:12 -07001537 goto retry_locked;
1538retry:
Sage Weilbe655592011-11-30 09:47:09 -08001539 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001540retry_locked:
1541 file_wanted = __ceph_caps_file_wanted(ci);
1542 used = __ceph_caps_used(ci);
1543 want = file_wanted | used;
Sage Weilcbd03632010-02-09 13:41:18 -08001544 issued = __ceph_caps_issued(ci, &implemented);
1545 revoking = implemented & ~issued;
Sage Weila8599bd2009-10-06 11:31:12 -07001546
1547 retain = want | CEPH_CAP_PIN;
1548 if (!mdsc->stopping && inode->i_nlink > 0) {
1549 if (want) {
1550 retain |= CEPH_CAP_ANY; /* be greedy */
1551 } else {
1552 retain |= CEPH_CAP_ANY_SHARED;
1553 /*
1554 * keep RD only if we didn't have the file open RW,
1555 * because then the mds would revoke it anyway to
1556 * journal max_size=0.
1557 */
1558 if (ci->i_max_size == 0)
1559 retain |= CEPH_CAP_ANY_RD;
1560 }
1561 }
1562
1563 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
Sage Weilcbd03632010-02-09 13:41:18 -08001564 " issued %s revoking %s retain %s %s%s%s\n", inode,
Sage Weila8599bd2009-10-06 11:31:12 -07001565 ceph_cap_string(file_wanted),
1566 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1567 ceph_cap_string(ci->i_flushing_caps),
Sage Weilcbd03632010-02-09 13:41:18 -08001568 ceph_cap_string(issued), ceph_cap_string(revoking),
Sage Weila8599bd2009-10-06 11:31:12 -07001569 ceph_cap_string(retain),
1570 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1571 (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
1572 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1573
1574 /*
1575 * If we no longer need to hold onto old our caps, and we may
1576 * have cached pages, but don't want them, then try to invalidate.
1577 * If we fail, it's because pages are locked.... try again later.
1578 */
1579 if ((!is_delayed || mdsc->stopping) &&
1580 ci->i_wrbuffer_ref == 0 && /* no dirty pages... */
Sage Weil93afd442010-09-17 08:38:25 -07001581 inode->i_data.nrpages && /* have cached pages */
Sage Weilcbd03632010-02-09 13:41:18 -08001582 (file_wanted == 0 || /* no open files */
Sage Weil29625072010-05-27 10:40:43 -07001583 (revoking & (CEPH_CAP_FILE_CACHE|
1584 CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */
Sage Weila8599bd2009-10-06 11:31:12 -07001585 !tried_invalidate) {
Sage Weila8599bd2009-10-06 11:31:12 -07001586 dout("check_caps trying to invalidate on %p\n", inode);
Sage Weil5ecad6f2010-02-17 10:43:37 -08001587 if (try_nonblocking_invalidate(inode) < 0) {
Sage Weil29625072010-05-27 10:40:43 -07001588 if (revoking & (CEPH_CAP_FILE_CACHE|
1589 CEPH_CAP_FILE_LAZYIO)) {
Sage Weil5ecad6f2010-02-17 10:43:37 -08001590 dout("check_caps queuing invalidate\n");
1591 queue_invalidate = 1;
1592 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1593 } else {
1594 dout("check_caps failed to invalidate pages\n");
1595 /* we failed to invalidate pages. check these
1596 caps again later. */
1597 force_requeue = 1;
1598 __cap_set_timeouts(mdsc, ci);
1599 }
Sage Weila8599bd2009-10-06 11:31:12 -07001600 }
1601 tried_invalidate = 1;
1602 goto retry_locked;
1603 }
1604
1605 num = 0;
1606 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1607 cap = rb_entry(p, struct ceph_cap, ci_node);
1608 num++;
1609
1610 /* avoid looping forever */
1611 if (mds >= cap->mds ||
1612 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
1613 continue;
1614
1615 /* NOTE: no side-effects allowed, until we take s_mutex */
1616
Yan, Zheng395c3122013-01-04 14:37:57 +08001617 cap_used = used;
1618 if (ci->i_auth_cap && cap != ci->i_auth_cap)
1619 cap_used &= ~ci->i_auth_cap->issued;
1620
Sage Weila8599bd2009-10-06 11:31:12 -07001621 revoking = cap->implemented & ~cap->issued;
Yan, Zheng395c3122013-01-04 14:37:57 +08001622 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
Sage Weil088b3f52011-01-18 08:56:01 -08001623 cap->mds, cap, ceph_cap_string(cap->issued),
Yan, Zheng395c3122013-01-04 14:37:57 +08001624 ceph_cap_string(cap_used),
Sage Weil088b3f52011-01-18 08:56:01 -08001625 ceph_cap_string(cap->implemented),
1626 ceph_cap_string(revoking));
Sage Weila8599bd2009-10-06 11:31:12 -07001627
1628 if (cap == ci->i_auth_cap &&
1629 (cap->issued & CEPH_CAP_FILE_WR)) {
1630 /* request larger max_size from MDS? */
1631 if (ci->i_wanted_max_size > ci->i_max_size &&
1632 ci->i_wanted_max_size > ci->i_requested_max_size) {
1633 dout("requesting new max_size\n");
1634 goto ack;
1635 }
1636
1637 /* approaching file_max? */
1638 if ((inode->i_size << 1) >= ci->i_max_size &&
1639 (ci->i_reported_size << 1) < ci->i_max_size) {
1640 dout("i_size approaching max_size\n");
1641 goto ack;
1642 }
1643 }
1644 /* flush anything dirty? */
1645 if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
1646 ci->i_dirty_caps) {
1647 dout("flushing dirty caps\n");
1648 goto ack;
1649 }
1650
1651 /* completed revocation? going down and there are no caps? */
Yan, Zheng395c3122013-01-04 14:37:57 +08001652 if (revoking && (revoking & cap_used) == 0) {
Sage Weila8599bd2009-10-06 11:31:12 -07001653 dout("completed revocation of %s\n",
1654 ceph_cap_string(cap->implemented & ~cap->issued));
1655 goto ack;
1656 }
1657
1658 /* want more caps from mds? */
1659 if (want & ~(cap->mds_wanted | cap->issued))
1660 goto ack;
1661
1662 /* things we might delay */
1663 if ((cap->issued & ~retain) == 0 &&
1664 cap->mds_wanted == want)
1665 continue; /* nope, all good */
1666
1667 if (is_delayed)
1668 goto ack;
1669
1670 /* delay? */
1671 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1672 time_before(jiffies, ci->i_hold_caps_max)) {
1673 dout(" delaying issued %s -> %s, wanted %s -> %s\n",
1674 ceph_cap_string(cap->issued),
1675 ceph_cap_string(cap->issued & retain),
1676 ceph_cap_string(cap->mds_wanted),
1677 ceph_cap_string(want));
1678 delayed++;
1679 continue;
1680 }
1681
1682ack:
Sage Weile9964c12010-03-01 15:16:56 -08001683 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1684 dout(" skipping %p I_NOFLUSH set\n", inode);
1685 continue;
1686 }
1687
Sage Weila8599bd2009-10-06 11:31:12 -07001688 if (session && session != cap->session) {
1689 dout("oops, wrong session %p mutex\n", session);
1690 mutex_unlock(&session->s_mutex);
1691 session = NULL;
1692 }
1693 if (!session) {
1694 session = cap->session;
1695 if (mutex_trylock(&session->s_mutex) == 0) {
1696 dout("inverting session/ino locks on %p\n",
1697 session);
Sage Weilbe655592011-11-30 09:47:09 -08001698 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001699 if (took_snap_rwsem) {
1700 up_read(&mdsc->snap_rwsem);
1701 took_snap_rwsem = 0;
1702 }
1703 mutex_lock(&session->s_mutex);
1704 goto retry;
1705 }
1706 }
1707 /* take snap_rwsem after session mutex */
1708 if (!took_snap_rwsem) {
1709 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
1710 dout("inverting snap/in locks on %p\n",
1711 inode);
Sage Weilbe655592011-11-30 09:47:09 -08001712 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001713 down_read(&mdsc->snap_rwsem);
1714 took_snap_rwsem = 1;
1715 goto retry;
1716 }
1717 took_snap_rwsem = 1;
1718 }
1719
Sage Weilcdc35f92009-10-14 14:24:19 -07001720 if (cap == ci->i_auth_cap && ci->i_dirty_caps)
1721 flushing = __mark_caps_flushing(inode, session);
Sage Weil24be0c42011-01-18 08:48:06 -08001722 else
1723 flushing = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07001724
1725 mds = cap->mds; /* remember mds, so we don't repeat */
1726 sent++;
1727
Sage Weilbe655592011-11-30 09:47:09 -08001728 /* __send_cap drops i_ceph_lock */
Yan, Zheng395c3122013-01-04 14:37:57 +08001729 delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, cap_used,
1730 want, retain, flushing, NULL);
Sage Weilbe655592011-11-30 09:47:09 -08001731 goto retry; /* retake i_ceph_lock and restart our cap scan. */
Sage Weila8599bd2009-10-06 11:31:12 -07001732 }
1733
1734 /*
1735 * Reschedule delayed caps release if we delayed anything,
1736 * otherwise cancel.
1737 */
1738 if (delayed && is_delayed)
1739 force_requeue = 1; /* __send_cap delayed release; requeue */
1740 if (!delayed && !is_delayed)
1741 __cap_delay_cancel(mdsc, ci);
1742 else if (!is_delayed || force_requeue)
1743 __cap_delay_requeue(mdsc, ci);
1744
Sage Weilbe655592011-11-30 09:47:09 -08001745 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001746
Sage Weilcbd03632010-02-09 13:41:18 -08001747 if (queue_invalidate)
Sage Weil3c6f6b72010-02-09 15:24:44 -08001748 ceph_queue_invalidate(inode);
Sage Weilcbd03632010-02-09 13:41:18 -08001749
Sage Weilcdc2ce02010-03-16 13:39:28 -07001750 if (session)
Sage Weila8599bd2009-10-06 11:31:12 -07001751 mutex_unlock(&session->s_mutex);
1752 if (took_snap_rwsem)
1753 up_read(&mdsc->snap_rwsem);
1754}
1755
1756/*
Sage Weila8599bd2009-10-06 11:31:12 -07001757 * Try to flush dirty caps back to the auth mds.
1758 */
Yan, Zheng4fe59782013-10-31 16:44:14 +08001759static int try_flush_caps(struct inode *inode, unsigned *flush_tid)
Sage Weila8599bd2009-10-06 11:31:12 -07001760{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001761 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001762 struct ceph_inode_info *ci = ceph_inode(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07001763 int flushing = 0;
Yan, Zheng4fe59782013-10-31 16:44:14 +08001764 struct ceph_mds_session *session = NULL;
Sage Weila8599bd2009-10-06 11:31:12 -07001765
1766retry:
Sage Weilbe655592011-11-30 09:47:09 -08001767 spin_lock(&ci->i_ceph_lock);
Sage Weile9964c12010-03-01 15:16:56 -08001768 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1769 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
1770 goto out;
1771 }
Sage Weila8599bd2009-10-06 11:31:12 -07001772 if (ci->i_dirty_caps && ci->i_auth_cap) {
1773 struct ceph_cap *cap = ci->i_auth_cap;
1774 int used = __ceph_caps_used(ci);
1775 int want = __ceph_caps_wanted(ci);
1776 int delayed;
1777
Yan, Zheng4fe59782013-10-31 16:44:14 +08001778 if (!session || session != cap->session) {
Sage Weilbe655592011-11-30 09:47:09 -08001779 spin_unlock(&ci->i_ceph_lock);
Yan, Zheng4fe59782013-10-31 16:44:14 +08001780 if (session)
1781 mutex_unlock(&session->s_mutex);
Sage Weila8599bd2009-10-06 11:31:12 -07001782 session = cap->session;
1783 mutex_lock(&session->s_mutex);
1784 goto retry;
1785 }
Sage Weila8599bd2009-10-06 11:31:12 -07001786 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
1787 goto out;
1788
Sage Weilcdc35f92009-10-14 14:24:19 -07001789 flushing = __mark_caps_flushing(inode, session);
Sage Weila8599bd2009-10-06 11:31:12 -07001790
Sage Weilbe655592011-11-30 09:47:09 -08001791 /* __send_cap drops i_ceph_lock */
Sage Weila8599bd2009-10-06 11:31:12 -07001792 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
1793 cap->issued | cap->implemented, flushing,
1794 flush_tid);
1795 if (!delayed)
1796 goto out_unlocked;
1797
Sage Weilbe655592011-11-30 09:47:09 -08001798 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001799 __cap_delay_requeue(mdsc, ci);
1800 }
1801out:
Sage Weilbe655592011-11-30 09:47:09 -08001802 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001803out_unlocked:
Yan, Zheng4fe59782013-10-31 16:44:14 +08001804 if (session)
Sage Weila8599bd2009-10-06 11:31:12 -07001805 mutex_unlock(&session->s_mutex);
1806 return flushing;
1807}
1808
1809/*
1810 * Return true if we've flushed caps through the given flush_tid.
1811 */
1812static int caps_are_flushed(struct inode *inode, unsigned tid)
1813{
1814 struct ceph_inode_info *ci = ceph_inode(inode);
Dan Carpentera5ee7512010-05-07 10:27:14 +02001815 int i, ret = 1;
Sage Weila8599bd2009-10-06 11:31:12 -07001816
Sage Weilbe655592011-11-30 09:47:09 -08001817 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001818 for (i = 0; i < CEPH_CAP_BITS; i++)
1819 if ((ci->i_flushing_caps & (1 << i)) &&
1820 ci->i_cap_flush_tid[i] <= tid) {
1821 /* still flushing this bit */
1822 ret = 0;
1823 break;
1824 }
Sage Weilbe655592011-11-30 09:47:09 -08001825 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001826 return ret;
1827}
1828
1829/*
1830 * Wait on any unsafe replies for the given inode. First wait on the
1831 * newest request, and make that the upper bound. Then, if there are
1832 * more requests, keep waiting on the oldest as long as it is still older
1833 * than the original request.
1834 */
1835static void sync_write_wait(struct inode *inode)
1836{
1837 struct ceph_inode_info *ci = ceph_inode(inode);
1838 struct list_head *head = &ci->i_unsafe_writes;
1839 struct ceph_osd_request *req;
1840 u64 last_tid;
1841
1842 spin_lock(&ci->i_unsafe_lock);
1843 if (list_empty(head))
1844 goto out;
1845
1846 /* set upper bound as _last_ entry in chain */
1847 req = list_entry(head->prev, struct ceph_osd_request,
1848 r_unsafe_item);
1849 last_tid = req->r_tid;
1850
1851 do {
1852 ceph_osdc_get_request(req);
1853 spin_unlock(&ci->i_unsafe_lock);
1854 dout("sync_write_wait on tid %llu (until %llu)\n",
1855 req->r_tid, last_tid);
1856 wait_for_completion(&req->r_safe_completion);
1857 spin_lock(&ci->i_unsafe_lock);
1858 ceph_osdc_put_request(req);
1859
1860 /*
1861 * from here on look at first entry in chain, since we
1862 * only want to wait for anything older than last_tid
1863 */
1864 if (list_empty(head))
1865 break;
1866 req = list_entry(head->next, struct ceph_osd_request,
1867 r_unsafe_item);
1868 } while (req->r_tid < last_tid);
1869out:
1870 spin_unlock(&ci->i_unsafe_lock);
1871}
1872
Josef Bacik02c24a82011-07-16 20:44:56 -04001873int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
Sage Weila8599bd2009-10-06 11:31:12 -07001874{
Christoph Hellwig7ea80852010-05-26 17:53:25 +02001875 struct inode *inode = file->f_mapping->host;
Sage Weila8599bd2009-10-06 11:31:12 -07001876 struct ceph_inode_info *ci = ceph_inode(inode);
1877 unsigned flush_tid;
1878 int ret;
1879 int dirty;
1880
1881 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
1882 sync_write_wait(inode);
1883
Josef Bacik02c24a82011-07-16 20:44:56 -04001884 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
Sage Weila8599bd2009-10-06 11:31:12 -07001885 if (ret < 0)
1886 return ret;
Josef Bacik02c24a82011-07-16 20:44:56 -04001887 mutex_lock(&inode->i_mutex);
Sage Weila8599bd2009-10-06 11:31:12 -07001888
Yan, Zheng4fe59782013-10-31 16:44:14 +08001889 dirty = try_flush_caps(inode, &flush_tid);
Sage Weila8599bd2009-10-06 11:31:12 -07001890 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
1891
1892 /*
1893 * only wait on non-file metadata writeback (the mds
1894 * can recover size and mtime, so we don't need to
1895 * wait for that)
1896 */
1897 if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
1898 dout("fsync waiting for flush_tid %u\n", flush_tid);
1899 ret = wait_event_interruptible(ci->i_cap_wq,
1900 caps_are_flushed(inode, flush_tid));
1901 }
1902
1903 dout("fsync %p%s done\n", inode, datasync ? " datasync" : "");
Josef Bacik02c24a82011-07-16 20:44:56 -04001904 mutex_unlock(&inode->i_mutex);
Sage Weila8599bd2009-10-06 11:31:12 -07001905 return ret;
1906}
1907
1908/*
1909 * Flush any dirty caps back to the mds. If we aren't asked to wait,
1910 * queue inode for flush but don't do so immediately, because we can
1911 * get by with fewer MDS messages if we wait for data writeback to
1912 * complete first.
1913 */
Stephen Rothwellf1a3d572010-01-18 11:53:08 +11001914int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
Sage Weila8599bd2009-10-06 11:31:12 -07001915{
1916 struct ceph_inode_info *ci = ceph_inode(inode);
1917 unsigned flush_tid;
1918 int err = 0;
1919 int dirty;
Stephen Rothwellf1a3d572010-01-18 11:53:08 +11001920 int wait = wbc->sync_mode == WB_SYNC_ALL;
Sage Weila8599bd2009-10-06 11:31:12 -07001921
1922 dout("write_inode %p wait=%d\n", inode, wait);
1923 if (wait) {
Yan, Zheng4fe59782013-10-31 16:44:14 +08001924 dirty = try_flush_caps(inode, &flush_tid);
Sage Weila8599bd2009-10-06 11:31:12 -07001925 if (dirty)
1926 err = wait_event_interruptible(ci->i_cap_wq,
1927 caps_are_flushed(inode, flush_tid));
1928 } else {
Cheng Renquan640ef792010-03-26 17:40:33 +08001929 struct ceph_mds_client *mdsc =
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001930 ceph_sb_to_client(inode->i_sb)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001931
Sage Weilbe655592011-11-30 09:47:09 -08001932 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001933 if (__ceph_caps_dirty(ci))
1934 __cap_delay_requeue_front(mdsc, ci);
Sage Weilbe655592011-11-30 09:47:09 -08001935 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001936 }
1937 return err;
1938}
1939
1940/*
1941 * After a recovering MDS goes active, we need to resend any caps
1942 * we were flushing.
1943 *
1944 * Caller holds session->s_mutex.
1945 */
1946static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc,
1947 struct ceph_mds_session *session)
1948{
1949 struct ceph_cap_snap *capsnap;
1950
1951 dout("kick_flushing_capsnaps mds%d\n", session->s_mds);
1952 list_for_each_entry(capsnap, &session->s_cap_snaps_flushing,
1953 flushing_item) {
1954 struct ceph_inode_info *ci = capsnap->ci;
1955 struct inode *inode = &ci->vfs_inode;
1956 struct ceph_cap *cap;
1957
Sage Weilbe655592011-11-30 09:47:09 -08001958 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001959 cap = ci->i_auth_cap;
1960 if (cap && cap->session == session) {
1961 dout("kick_flushing_caps %p cap %p capsnap %p\n", inode,
1962 cap, capsnap);
Sage Weile8351242010-09-17 08:03:08 -07001963 __ceph_flush_snaps(ci, &session, 1);
Sage Weila8599bd2009-10-06 11:31:12 -07001964 } else {
1965 pr_err("%p auth cap %p not mds%d ???\n", inode,
1966 cap, session->s_mds);
Sage Weila8599bd2009-10-06 11:31:12 -07001967 }
Sage Weilbe655592011-11-30 09:47:09 -08001968 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001969 }
1970}
1971
1972void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
1973 struct ceph_mds_session *session)
1974{
1975 struct ceph_inode_info *ci;
1976
1977 kick_flushing_capsnaps(mdsc, session);
1978
1979 dout("kick_flushing_caps mds%d\n", session->s_mds);
1980 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
1981 struct inode *inode = &ci->vfs_inode;
1982 struct ceph_cap *cap;
1983 int delayed = 0;
1984
Sage Weilbe655592011-11-30 09:47:09 -08001985 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001986 cap = ci->i_auth_cap;
1987 if (cap && cap->session == session) {
1988 dout("kick_flushing_caps %p cap %p %s\n", inode,
1989 cap, ceph_cap_string(ci->i_flushing_caps));
1990 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1991 __ceph_caps_used(ci),
1992 __ceph_caps_wanted(ci),
1993 cap->issued | cap->implemented,
1994 ci->i_flushing_caps, NULL);
1995 if (delayed) {
Sage Weilbe655592011-11-30 09:47:09 -08001996 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001997 __cap_delay_requeue(mdsc, ci);
Sage Weilbe655592011-11-30 09:47:09 -08001998 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001999 }
2000 } else {
2001 pr_err("%p auth cap %p not mds%d ???\n", inode,
2002 cap, session->s_mds);
Sage Weilbe655592011-11-30 09:47:09 -08002003 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002004 }
2005 }
2006}
2007
Sage Weil088b3f52011-01-18 08:56:01 -08002008static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
2009 struct ceph_mds_session *session,
2010 struct inode *inode)
2011{
2012 struct ceph_inode_info *ci = ceph_inode(inode);
2013 struct ceph_cap *cap;
2014 int delayed = 0;
2015
Sage Weilbe655592011-11-30 09:47:09 -08002016 spin_lock(&ci->i_ceph_lock);
Sage Weil088b3f52011-01-18 08:56:01 -08002017 cap = ci->i_auth_cap;
2018 dout("kick_flushing_inode_caps %p flushing %s flush_seq %lld\n", inode,
2019 ceph_cap_string(ci->i_flushing_caps), ci->i_cap_flush_seq);
Yan, Zheng005c4692013-05-31 16:40:24 +08002020
Sage Weil088b3f52011-01-18 08:56:01 -08002021 __ceph_flush_snaps(ci, &session, 1);
Yan, Zheng005c4692013-05-31 16:40:24 +08002022
Sage Weil088b3f52011-01-18 08:56:01 -08002023 if (ci->i_flushing_caps) {
Yan, Zheng005c4692013-05-31 16:40:24 +08002024 spin_lock(&mdsc->cap_dirty_lock);
2025 list_move_tail(&ci->i_flushing_item,
2026 &cap->session->s_cap_flushing);
2027 spin_unlock(&mdsc->cap_dirty_lock);
2028
Sage Weil088b3f52011-01-18 08:56:01 -08002029 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
2030 __ceph_caps_used(ci),
2031 __ceph_caps_wanted(ci),
2032 cap->issued | cap->implemented,
2033 ci->i_flushing_caps, NULL);
2034 if (delayed) {
Sage Weilbe655592011-11-30 09:47:09 -08002035 spin_lock(&ci->i_ceph_lock);
Sage Weil088b3f52011-01-18 08:56:01 -08002036 __cap_delay_requeue(mdsc, ci);
Sage Weilbe655592011-11-30 09:47:09 -08002037 spin_unlock(&ci->i_ceph_lock);
Sage Weil088b3f52011-01-18 08:56:01 -08002038 }
2039 } else {
Sage Weilbe655592011-11-30 09:47:09 -08002040 spin_unlock(&ci->i_ceph_lock);
Sage Weil088b3f52011-01-18 08:56:01 -08002041 }
2042}
2043
Sage Weila8599bd2009-10-06 11:31:12 -07002044
2045/*
2046 * Take references to capabilities we hold, so that we don't release
2047 * them to the MDS prematurely.
2048 *
Sage Weilbe655592011-11-30 09:47:09 -08002049 * Protected by i_ceph_lock.
Sage Weila8599bd2009-10-06 11:31:12 -07002050 */
2051static void __take_cap_refs(struct ceph_inode_info *ci, int got)
2052{
2053 if (got & CEPH_CAP_PIN)
2054 ci->i_pin_ref++;
2055 if (got & CEPH_CAP_FILE_RD)
2056 ci->i_rd_ref++;
2057 if (got & CEPH_CAP_FILE_CACHE)
2058 ci->i_rdcache_ref++;
2059 if (got & CEPH_CAP_FILE_WR)
2060 ci->i_wr_ref++;
2061 if (got & CEPH_CAP_FILE_BUFFER) {
Henry C Changd3d07202011-05-11 10:29:54 +00002062 if (ci->i_wb_ref == 0)
Sage Weil3772d262011-05-03 09:28:08 -07002063 ihold(&ci->vfs_inode);
Henry C Changd3d07202011-05-11 10:29:54 +00002064 ci->i_wb_ref++;
2065 dout("__take_cap_refs %p wb %d -> %d (?)\n",
2066 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
Sage Weila8599bd2009-10-06 11:31:12 -07002067 }
2068}
2069
2070/*
2071 * Try to grab cap references. Specify those refs we @want, and the
2072 * minimal set we @need. Also include the larger offset we are writing
2073 * to (when applicable), and check against max_size here as well.
2074 * Note that caller is responsible for ensuring max_size increases are
2075 * requested from the MDS.
2076 */
2077static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
2078 int *got, loff_t endoff, int *check_max, int *err)
2079{
2080 struct inode *inode = &ci->vfs_inode;
2081 int ret = 0;
2082 int have, implemented;
Sage Weil195d3ce2010-03-01 09:57:54 -08002083 int file_wanted;
Sage Weila8599bd2009-10-06 11:31:12 -07002084
2085 dout("get_cap_refs %p need %s want %s\n", inode,
2086 ceph_cap_string(need), ceph_cap_string(want));
Sage Weilbe655592011-11-30 09:47:09 -08002087 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002088
Sage Weil195d3ce2010-03-01 09:57:54 -08002089 /* make sure file is actually open */
2090 file_wanted = __ceph_caps_file_wanted(ci);
2091 if ((file_wanted & need) == 0) {
2092 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
2093 ceph_cap_string(need), ceph_cap_string(file_wanted));
Sage Weila8599bd2009-10-06 11:31:12 -07002094 *err = -EBADF;
2095 ret = 1;
2096 goto out;
2097 }
2098
Yan, Zheng37505d52013-04-12 16:11:10 +08002099 /* finish pending truncate */
2100 while (ci->i_truncate_pending) {
2101 spin_unlock(&ci->i_ceph_lock);
Yan, Zhengb415bf42013-07-02 12:40:19 +08002102 __ceph_do_pending_vmtruncate(inode);
Yan, Zheng37505d52013-04-12 16:11:10 +08002103 spin_lock(&ci->i_ceph_lock);
2104 }
2105
Yan, Zheng3871cbb2013-08-05 14:10:29 +08002106 have = __ceph_caps_issued(ci, &implemented);
2107
2108 if (have & need & CEPH_CAP_FILE_WR) {
Sage Weila8599bd2009-10-06 11:31:12 -07002109 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2110 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2111 inode, endoff, ci->i_max_size);
Yan, Zheng3871cbb2013-08-05 14:10:29 +08002112 if (endoff > ci->i_requested_max_size) {
Sage Weila8599bd2009-10-06 11:31:12 -07002113 *check_max = 1;
2114 ret = 1;
2115 }
2116 goto out;
2117 }
2118 /*
2119 * If a sync write is in progress, we must wait, so that we
2120 * can get a final snapshot value for size+mtime.
2121 */
2122 if (__ceph_have_pending_cap_snap(ci)) {
2123 dout("get_cap_refs %p cap_snap_pending\n", inode);
2124 goto out;
2125 }
2126 }
Sage Weila8599bd2009-10-06 11:31:12 -07002127
Sage Weila8599bd2009-10-06 11:31:12 -07002128 if ((have & need) == need) {
2129 /*
2130 * Look at (implemented & ~have & not) so that we keep waiting
2131 * on transition from wanted -> needed caps. This is needed
2132 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2133 * going before a prior buffered writeback happens.
2134 */
2135 int not = want & ~(have & need);
2136 int revoking = implemented & ~have;
2137 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2138 inode, ceph_cap_string(have), ceph_cap_string(not),
2139 ceph_cap_string(revoking));
2140 if ((revoking & not) == 0) {
2141 *got = need | (have & want);
2142 __take_cap_refs(ci, *got);
2143 ret = 1;
2144 }
2145 } else {
2146 dout("get_cap_refs %p have %s needed %s\n", inode,
2147 ceph_cap_string(have), ceph_cap_string(need));
2148 }
2149out:
Sage Weilbe655592011-11-30 09:47:09 -08002150 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002151 dout("get_cap_refs %p ret %d got %s\n", inode,
2152 ret, ceph_cap_string(*got));
2153 return ret;
2154}
2155
2156/*
2157 * Check the offset we are writing up to against our current
2158 * max_size. If necessary, tell the MDS we want to write to
2159 * a larger offset.
2160 */
2161static void check_max_size(struct inode *inode, loff_t endoff)
2162{
2163 struct ceph_inode_info *ci = ceph_inode(inode);
2164 int check = 0;
2165
2166 /* do we need to explicitly request a larger max_size? */
Sage Weilbe655592011-11-30 09:47:09 -08002167 spin_lock(&ci->i_ceph_lock);
Yan, Zheng3871cbb2013-08-05 14:10:29 +08002168 if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
Sage Weila8599bd2009-10-06 11:31:12 -07002169 dout("write %p at large endoff %llu, req max_size\n",
2170 inode, endoff);
2171 ci->i_wanted_max_size = endoff;
Sage Weila8599bd2009-10-06 11:31:12 -07002172 }
Yan, Zheng3871cbb2013-08-05 14:10:29 +08002173 /* duplicate ceph_check_caps()'s logic */
2174 if (ci->i_auth_cap &&
2175 (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
2176 ci->i_wanted_max_size > ci->i_max_size &&
2177 ci->i_wanted_max_size > ci->i_requested_max_size)
2178 check = 1;
Sage Weilbe655592011-11-30 09:47:09 -08002179 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002180 if (check)
2181 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2182}
2183
2184/*
2185 * Wait for caps, and take cap references. If we can't get a WR cap
2186 * due to a small max_size, make sure we check_max_size (and possibly
2187 * ask the mds) so we don't get hung up indefinitely.
2188 */
2189int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got,
2190 loff_t endoff)
2191{
2192 int check_max, ret, err;
2193
2194retry:
2195 if (endoff > 0)
2196 check_max_size(&ci->vfs_inode, endoff);
2197 check_max = 0;
2198 err = 0;
2199 ret = wait_event_interruptible(ci->i_cap_wq,
2200 try_get_cap_refs(ci, need, want,
2201 got, endoff,
2202 &check_max, &err));
2203 if (err)
2204 ret = err;
2205 if (check_max)
2206 goto retry;
2207 return ret;
2208}
2209
2210/*
2211 * Take cap refs. Caller must already know we hold at least one ref
2212 * on the caps in question or we don't know this is safe.
2213 */
2214void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2215{
Sage Weilbe655592011-11-30 09:47:09 -08002216 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002217 __take_cap_refs(ci, caps);
Sage Weilbe655592011-11-30 09:47:09 -08002218 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002219}
2220
2221/*
2222 * Release cap refs.
2223 *
2224 * If we released the last ref on any given cap, call ceph_check_caps
2225 * to release (or schedule a release).
2226 *
2227 * If we are releasing a WR cap (from a sync write), finalize any affected
2228 * cap_snap, and wake up any waiters.
2229 */
2230void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
2231{
2232 struct inode *inode = &ci->vfs_inode;
2233 int last = 0, put = 0, flushsnaps = 0, wake = 0;
2234 struct ceph_cap_snap *capsnap;
2235
Sage Weilbe655592011-11-30 09:47:09 -08002236 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002237 if (had & CEPH_CAP_PIN)
2238 --ci->i_pin_ref;
2239 if (had & CEPH_CAP_FILE_RD)
2240 if (--ci->i_rd_ref == 0)
2241 last++;
2242 if (had & CEPH_CAP_FILE_CACHE)
2243 if (--ci->i_rdcache_ref == 0)
2244 last++;
2245 if (had & CEPH_CAP_FILE_BUFFER) {
Henry C Changd3d07202011-05-11 10:29:54 +00002246 if (--ci->i_wb_ref == 0) {
Sage Weila8599bd2009-10-06 11:31:12 -07002247 last++;
2248 put++;
2249 }
Henry C Changd3d07202011-05-11 10:29:54 +00002250 dout("put_cap_refs %p wb %d -> %d (?)\n",
2251 inode, ci->i_wb_ref+1, ci->i_wb_ref);
Sage Weila8599bd2009-10-06 11:31:12 -07002252 }
2253 if (had & CEPH_CAP_FILE_WR)
2254 if (--ci->i_wr_ref == 0) {
2255 last++;
2256 if (!list_empty(&ci->i_cap_snaps)) {
2257 capsnap = list_first_entry(&ci->i_cap_snaps,
2258 struct ceph_cap_snap,
2259 ci_item);
2260 if (capsnap->writing) {
2261 capsnap->writing = 0;
2262 flushsnaps =
2263 __ceph_finish_cap_snap(ci,
2264 capsnap);
2265 wake = 1;
2266 }
2267 }
2268 }
Sage Weilbe655592011-11-30 09:47:09 -08002269 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002270
Sage Weil819ccbf2010-04-01 09:33:46 -07002271 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
2272 last ? " last" : "", put ? " put" : "");
Sage Weila8599bd2009-10-06 11:31:12 -07002273
2274 if (last && !flushsnaps)
2275 ceph_check_caps(ci, 0, NULL);
2276 else if (flushsnaps)
2277 ceph_flush_snaps(ci);
2278 if (wake)
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002279 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07002280 if (put)
2281 iput(inode);
2282}
2283
2284/*
2285 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2286 * context. Adjust per-snap dirty page accounting as appropriate.
2287 * Once all dirty data for a cap_snap is flushed, flush snapped file
2288 * metadata back to the MDS. If we dropped the last ref, call
2289 * ceph_check_caps.
2290 */
2291void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
2292 struct ceph_snap_context *snapc)
2293{
2294 struct inode *inode = &ci->vfs_inode;
2295 int last = 0;
Sage Weil819ccbf2010-04-01 09:33:46 -07002296 int complete_capsnap = 0;
2297 int drop_capsnap = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07002298 int found = 0;
2299 struct ceph_cap_snap *capsnap = NULL;
2300
Sage Weilbe655592011-11-30 09:47:09 -08002301 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002302 ci->i_wrbuffer_ref -= nr;
2303 last = !ci->i_wrbuffer_ref;
2304
2305 if (ci->i_head_snapc == snapc) {
2306 ci->i_wrbuffer_ref_head -= nr;
Sage Weil7d8cb262010-08-24 08:44:16 -07002307 if (ci->i_wrbuffer_ref_head == 0 &&
2308 ci->i_dirty_caps == 0 && ci->i_flushing_caps == 0) {
2309 BUG_ON(!ci->i_head_snapc);
Sage Weila8599bd2009-10-06 11:31:12 -07002310 ceph_put_snap_context(ci->i_head_snapc);
2311 ci->i_head_snapc = NULL;
2312 }
2313 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2314 inode,
2315 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
2316 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
2317 last ? " LAST" : "");
2318 } else {
2319 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2320 if (capsnap->context == snapc) {
2321 found = 1;
Sage Weila8599bd2009-10-06 11:31:12 -07002322 break;
2323 }
2324 }
2325 BUG_ON(!found);
Sage Weil819ccbf2010-04-01 09:33:46 -07002326 capsnap->dirty_pages -= nr;
2327 if (capsnap->dirty_pages == 0) {
2328 complete_capsnap = 1;
2329 if (capsnap->dirty == 0)
2330 /* cap writeback completed before we created
2331 * the cap_snap; no FLUSHSNAP is needed */
2332 drop_capsnap = 1;
2333 }
Sage Weila8599bd2009-10-06 11:31:12 -07002334 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
Sage Weil819ccbf2010-04-01 09:33:46 -07002335 " snap %lld %d/%d -> %d/%d %s%s%s\n",
Sage Weila8599bd2009-10-06 11:31:12 -07002336 inode, capsnap, capsnap->context->seq,
2337 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
2338 ci->i_wrbuffer_ref, capsnap->dirty_pages,
2339 last ? " (wrbuffer last)" : "",
Sage Weil819ccbf2010-04-01 09:33:46 -07002340 complete_capsnap ? " (complete capsnap)" : "",
2341 drop_capsnap ? " (drop capsnap)" : "");
2342 if (drop_capsnap) {
2343 ceph_put_snap_context(capsnap->context);
2344 list_del(&capsnap->ci_item);
2345 list_del(&capsnap->flushing_item);
2346 ceph_put_cap_snap(capsnap);
2347 }
Sage Weila8599bd2009-10-06 11:31:12 -07002348 }
2349
Sage Weilbe655592011-11-30 09:47:09 -08002350 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002351
2352 if (last) {
2353 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2354 iput(inode);
Sage Weil819ccbf2010-04-01 09:33:46 -07002355 } else if (complete_capsnap) {
Sage Weila8599bd2009-10-06 11:31:12 -07002356 ceph_flush_snaps(ci);
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002357 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07002358 }
Sage Weil819ccbf2010-04-01 09:33:46 -07002359 if (drop_capsnap)
2360 iput(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07002361}
2362
2363/*
Yan, Zhengca20c992013-07-21 10:07:51 +08002364 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
2365 */
2366static void invalidate_aliases(struct inode *inode)
2367{
2368 struct dentry *dn, *prev = NULL;
2369
2370 dout("invalidate_aliases inode %p\n", inode);
2371 d_prune_aliases(inode);
2372 /*
2373 * For non-directory inode, d_find_alias() only returns
J. Bruce Fieldsfc12c802014-01-16 17:42:53 -05002374 * hashed dentry. After calling d_invalidate(), the
2375 * dentry becomes unhashed.
Yan, Zhengca20c992013-07-21 10:07:51 +08002376 *
Yan, Zhenga8d436f2013-09-02 15:19:54 +08002377 * For directory inode, d_find_alias() can return
J. Bruce Fieldsfc12c802014-01-16 17:42:53 -05002378 * unhashed dentry. But directory inode should have
Yan, Zhengca20c992013-07-21 10:07:51 +08002379 * one alias at most.
2380 */
2381 while ((dn = d_find_alias(inode))) {
2382 if (dn == prev) {
2383 dput(dn);
2384 break;
2385 }
Yan, Zhenga8d436f2013-09-02 15:19:54 +08002386 d_invalidate(dn);
Yan, Zhengca20c992013-07-21 10:07:51 +08002387 if (prev)
2388 dput(prev);
2389 prev = dn;
2390 }
2391 if (prev)
2392 dput(prev);
2393}
2394
2395/*
Sage Weila8599bd2009-10-06 11:31:12 -07002396 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
2397 * actually be a revocation if it specifies a smaller cap set.)
2398 *
Sage Weilbe655592011-11-30 09:47:09 -08002399 * caller holds s_mutex and i_ceph_lock, we drop both.
Sage Weil15637c82010-03-16 13:42:00 -07002400 *
Sage Weila8599bd2009-10-06 11:31:12 -07002401 * return value:
2402 * 0 - ok
2403 * 1 - check_caps on auth cap only (writeback)
2404 * 2 - check_caps (ack revoke)
2405 */
Sage Weil15637c82010-03-16 13:42:00 -07002406static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
2407 struct ceph_mds_session *session,
2408 struct ceph_cap *cap,
2409 struct ceph_buffer *xattr_buf)
Sage Weilbe655592011-11-30 09:47:09 -08002410 __releases(ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07002411{
2412 struct ceph_inode_info *ci = ceph_inode(inode);
2413 int mds = session->s_mds;
Sage Weil2f56f562010-10-27 20:59:49 -07002414 int seq = le32_to_cpu(grant->seq);
Sage Weila8599bd2009-10-06 11:31:12 -07002415 int newcaps = le32_to_cpu(grant->caps);
2416 int issued, implemented, used, wanted, dirty;
2417 u64 size = le64_to_cpu(grant->size);
2418 u64 max_size = le64_to_cpu(grant->max_size);
2419 struct timespec mtime, atime, ctime;
Sage Weil15637c82010-03-16 13:42:00 -07002420 int check_caps = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07002421 int wake = 0;
2422 int writeback = 0;
Sage Weil3c6f6b72010-02-09 15:24:44 -08002423 int queue_invalidate = 0;
Yan, Zhengca20c992013-07-21 10:07:51 +08002424 int deleted_inode = 0;
Milosz Tanski99ccbd22013-08-21 17:29:54 -04002425 int queue_revalidate = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07002426
Sage Weil2f56f562010-10-27 20:59:49 -07002427 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
2428 inode, cap, mds, seq, ceph_cap_string(newcaps));
Sage Weila8599bd2009-10-06 11:31:12 -07002429 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
2430 inode->i_size);
2431
Yan, Zheng11df2df2013-11-24 14:44:38 +08002432
2433 /*
2434 * auth mds of the inode changed. we received the cap export message,
2435 * but still haven't received the cap import message. handle_cap_export
2436 * updated the new auth MDS' cap.
2437 *
2438 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
2439 * that was sent before the cap import message. So don't remove caps.
2440 */
2441 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
2442 WARN_ON(cap != ci->i_auth_cap);
2443 WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id));
2444 seq = cap->seq;
2445 newcaps |= cap->issued;
2446 }
2447
Sage Weila8599bd2009-10-06 11:31:12 -07002448 /*
2449 * If CACHE is being revoked, and we have no dirty buffers,
2450 * try to invalidate (once). (If there are dirty buffers, we
2451 * will invalidate _after_ writeback.)
2452 */
Sage Weil3b454c42010-06-10 13:20:33 -07002453 if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
2454 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
Yehuda Sadehbcd2cbd2010-02-19 00:12:21 +00002455 !ci->i_wrbuffer_ref) {
Li Wange9075742013-08-15 22:00:25 -07002456 if (try_nonblocking_invalidate(inode)) {
Sage Weila8599bd2009-10-06 11:31:12 -07002457 /* there were locked pages.. invalidate later
2458 in a separate thread. */
2459 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
Sage Weil3c6f6b72010-02-09 15:24:44 -08002460 queue_invalidate = 1;
Sage Weila8599bd2009-10-06 11:31:12 -07002461 ci->i_rdcache_revoking = ci->i_rdcache_gen;
2462 }
Sage Weila8599bd2009-10-06 11:31:12 -07002463 }
Milosz Tanski99ccbd22013-08-21 17:29:54 -04002464
2465 ceph_fscache_invalidate(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07002466 }
2467
2468 /* side effects now are allowed */
2469
2470 issued = __ceph_caps_issued(ci, &implemented);
2471 issued |= implemented | __ceph_caps_dirty(ci);
2472
Sage Weil685f9a5d2009-11-09 12:05:48 -08002473 cap->cap_gen = session->s_cap_gen;
Yan, Zheng11df2df2013-11-24 14:44:38 +08002474 cap->seq = seq;
Sage Weila8599bd2009-10-06 11:31:12 -07002475
2476 __check_cap_issue(ci, cap, newcaps);
2477
2478 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
2479 inode->i_mode = le32_to_cpu(grant->mode);
Eric W. Biederman05cb11c2013-01-31 02:56:19 -08002480 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
2481 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
Sage Weila8599bd2009-10-06 11:31:12 -07002482 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
Eric W. Biedermanbd2bae62013-01-31 04:05:39 -08002483 from_kuid(&init_user_ns, inode->i_uid),
2484 from_kgid(&init_user_ns, inode->i_gid));
Sage Weila8599bd2009-10-06 11:31:12 -07002485 }
2486
Yan, Zhengca20c992013-07-21 10:07:51 +08002487 if ((issued & CEPH_CAP_LINK_EXCL) == 0) {
Miklos Szeredibfe86842011-10-28 14:13:29 +02002488 set_nlink(inode, le32_to_cpu(grant->nlink));
Yan, Zhengca20c992013-07-21 10:07:51 +08002489 if (inode->i_nlink == 0 &&
2490 (newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL)))
2491 deleted_inode = 1;
2492 }
Sage Weila8599bd2009-10-06 11:31:12 -07002493
2494 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
2495 int len = le32_to_cpu(grant->xattr_len);
2496 u64 version = le64_to_cpu(grant->xattr_version);
2497
2498 if (version > ci->i_xattrs.version) {
2499 dout(" got new xattrs v%llu on %p len %d\n",
2500 version, inode, len);
2501 if (ci->i_xattrs.blob)
2502 ceph_buffer_put(ci->i_xattrs.blob);
2503 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
2504 ci->i_xattrs.version = version;
Guangliang Zhao7221fe42013-11-11 15:18:03 +08002505 ceph_forget_all_cached_acls(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07002506 }
2507 }
2508
Milosz Tanski99ccbd22013-08-21 17:29:54 -04002509 /* Do we need to revalidate our fscache cookie. Don't bother on the
2510 * first cache cap as we already validate at cookie creation time. */
2511 if ((issued & CEPH_CAP_FILE_CACHE) && ci->i_rdcache_gen > 1)
2512 queue_revalidate = 1;
2513
Sage Weila8599bd2009-10-06 11:31:12 -07002514 /* size/ctime/mtime/atime? */
2515 ceph_fill_file_size(inode, issued,
2516 le32_to_cpu(grant->truncate_seq),
2517 le64_to_cpu(grant->truncate_size), size);
2518 ceph_decode_timespec(&mtime, &grant->mtime);
2519 ceph_decode_timespec(&atime, &grant->atime);
2520 ceph_decode_timespec(&ctime, &grant->ctime);
2521 ceph_fill_file_time(inode, issued,
2522 le32_to_cpu(grant->time_warp_seq), &ctime, &mtime,
2523 &atime);
2524
Yan, Zheng11df2df2013-11-24 14:44:38 +08002525
2526 /* file layout may have changed */
2527 ci->i_layout = grant->layout;
2528
Sage Weila8599bd2009-10-06 11:31:12 -07002529 /* max size increase? */
Yan, Zheng5e62ad32012-11-19 10:49:04 +08002530 if (ci->i_auth_cap == cap && max_size != ci->i_max_size) {
Sage Weila8599bd2009-10-06 11:31:12 -07002531 dout("max_size %lld -> %llu\n", ci->i_max_size, max_size);
2532 ci->i_max_size = max_size;
2533 if (max_size >= ci->i_wanted_max_size) {
2534 ci->i_wanted_max_size = 0; /* reset */
2535 ci->i_requested_max_size = 0;
2536 }
2537 wake = 1;
2538 }
2539
2540 /* check cap bits */
2541 wanted = __ceph_caps_wanted(ci);
2542 used = __ceph_caps_used(ci);
2543 dirty = __ceph_caps_dirty(ci);
2544 dout(" my wanted = %s, used = %s, dirty %s\n",
2545 ceph_cap_string(wanted),
2546 ceph_cap_string(used),
2547 ceph_cap_string(dirty));
2548 if (wanted != le32_to_cpu(grant->wanted)) {
2549 dout("mds wanted %s -> %s\n",
2550 ceph_cap_string(le32_to_cpu(grant->wanted)),
2551 ceph_cap_string(wanted));
Yan, Zheng390306c2013-01-04 15:30:10 +08002552 /* imported cap may not have correct mds_wanted */
2553 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT)
2554 check_caps = 1;
Sage Weila8599bd2009-10-06 11:31:12 -07002555 }
2556
Sage Weila8599bd2009-10-06 11:31:12 -07002557 /* revocation, grant, or no-op? */
2558 if (cap->issued & ~newcaps) {
Sage Weil3b454c42010-06-10 13:20:33 -07002559 int revoking = cap->issued & ~newcaps;
2560
2561 dout("revocation: %s -> %s (revoking %s)\n",
2562 ceph_cap_string(cap->issued),
2563 ceph_cap_string(newcaps),
2564 ceph_cap_string(revoking));
Sage Weil0eb6cd42010-08-05 13:53:18 -07002565 if (revoking & used & CEPH_CAP_FILE_BUFFER)
Sage Weil3b454c42010-06-10 13:20:33 -07002566 writeback = 1; /* initiate writeback; will delay ack */
2567 else if (revoking == CEPH_CAP_FILE_CACHE &&
2568 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2569 queue_invalidate)
2570 ; /* do nothing yet, invalidation will be queued */
2571 else if (cap == ci->i_auth_cap)
2572 check_caps = 1; /* check auth cap only */
2573 else
2574 check_caps = 2; /* check all caps */
Sage Weila8599bd2009-10-06 11:31:12 -07002575 cap->issued = newcaps;
Sage Weil978097c2010-03-08 15:27:53 -08002576 cap->implemented |= newcaps;
Sage Weila8599bd2009-10-06 11:31:12 -07002577 } else if (cap->issued == newcaps) {
2578 dout("caps unchanged: %s -> %s\n",
2579 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
2580 } else {
2581 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
2582 ceph_cap_string(newcaps));
Yan, Zheng6ee6b9532013-07-02 12:40:21 +08002583 /* non-auth MDS is revoking the newly grant caps ? */
2584 if (cap == ci->i_auth_cap &&
2585 __ceph_caps_revoking_other(ci, cap, newcaps))
2586 check_caps = 2;
2587
Sage Weila8599bd2009-10-06 11:31:12 -07002588 cap->issued = newcaps;
2589 cap->implemented |= newcaps; /* add bits only, to
2590 * avoid stepping on a
2591 * pending revocation */
2592 wake = 1;
2593 }
Sage Weil978097c2010-03-08 15:27:53 -08002594 BUG_ON(cap->issued & ~cap->implemented);
Sage Weila8599bd2009-10-06 11:31:12 -07002595
Sage Weilbe655592011-11-30 09:47:09 -08002596 spin_unlock(&ci->i_ceph_lock);
Milosz Tanski99ccbd22013-08-21 17:29:54 -04002597
Sage Weil3c6f6b72010-02-09 15:24:44 -08002598 if (writeback)
Sage Weila8599bd2009-10-06 11:31:12 -07002599 /*
2600 * queue inode for writeback: we can't actually call
2601 * filemap_write_and_wait, etc. from message handler
2602 * context.
2603 */
Sage Weil3c6f6b72010-02-09 15:24:44 -08002604 ceph_queue_writeback(inode);
2605 if (queue_invalidate)
2606 ceph_queue_invalidate(inode);
Yan, Zhengca20c992013-07-21 10:07:51 +08002607 if (deleted_inode)
2608 invalidate_aliases(inode);
Milosz Tanski99ccbd22013-08-21 17:29:54 -04002609 if (queue_revalidate)
2610 ceph_queue_revalidate(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07002611 if (wake)
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002612 wake_up_all(&ci->i_cap_wq);
Sage Weil15637c82010-03-16 13:42:00 -07002613
2614 if (check_caps == 1)
2615 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
2616 session);
2617 else if (check_caps == 2)
2618 ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
2619 else
2620 mutex_unlock(&session->s_mutex);
Sage Weila8599bd2009-10-06 11:31:12 -07002621}
2622
2623/*
2624 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
2625 * MDS has been safely committed.
2626 */
Sage Weil6df058c2009-12-22 11:24:33 -08002627static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
Sage Weila8599bd2009-10-06 11:31:12 -07002628 struct ceph_mds_caps *m,
2629 struct ceph_mds_session *session,
2630 struct ceph_cap *cap)
Sage Weilbe655592011-11-30 09:47:09 -08002631 __releases(ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07002632{
2633 struct ceph_inode_info *ci = ceph_inode(inode);
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002634 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07002635 unsigned seq = le32_to_cpu(m->seq);
2636 int dirty = le32_to_cpu(m->dirty);
2637 int cleaned = 0;
Sage Weilafcdaea2009-10-14 14:27:38 -07002638 int drop = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07002639 int i;
2640
2641 for (i = 0; i < CEPH_CAP_BITS; i++)
2642 if ((dirty & (1 << i)) &&
2643 flush_tid == ci->i_cap_flush_tid[i])
2644 cleaned |= 1 << i;
2645
2646 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
2647 " flushing %s -> %s\n",
2648 inode, session->s_mds, seq, ceph_cap_string(dirty),
2649 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
2650 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
2651
2652 if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned))
2653 goto out;
2654
Sage Weila8599bd2009-10-06 11:31:12 -07002655 ci->i_flushing_caps &= ~cleaned;
Sage Weila8599bd2009-10-06 11:31:12 -07002656
2657 spin_lock(&mdsc->cap_dirty_lock);
2658 if (ci->i_flushing_caps == 0) {
2659 list_del_init(&ci->i_flushing_item);
2660 if (!list_empty(&session->s_cap_flushing))
2661 dout(" mds%d still flushing cap on %p\n",
2662 session->s_mds,
2663 &list_entry(session->s_cap_flushing.next,
2664 struct ceph_inode_info,
2665 i_flushing_item)->vfs_inode);
2666 mdsc->num_cap_flushing--;
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002667 wake_up_all(&mdsc->cap_flushing_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07002668 dout(" inode %p now !flushing\n", inode);
Sage Weilafcdaea2009-10-14 14:27:38 -07002669
2670 if (ci->i_dirty_caps == 0) {
2671 dout(" inode %p now clean\n", inode);
2672 BUG_ON(!list_empty(&ci->i_dirty_item));
2673 drop = 1;
Sage Weil7d8cb262010-08-24 08:44:16 -07002674 if (ci->i_wrbuffer_ref_head == 0) {
2675 BUG_ON(!ci->i_head_snapc);
2676 ceph_put_snap_context(ci->i_head_snapc);
2677 ci->i_head_snapc = NULL;
2678 }
Sage Weil76e3b392009-10-15 18:13:53 -07002679 } else {
2680 BUG_ON(list_empty(&ci->i_dirty_item));
Sage Weilafcdaea2009-10-14 14:27:38 -07002681 }
Sage Weila8599bd2009-10-06 11:31:12 -07002682 }
2683 spin_unlock(&mdsc->cap_dirty_lock);
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002684 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07002685
2686out:
Sage Weilbe655592011-11-30 09:47:09 -08002687 spin_unlock(&ci->i_ceph_lock);
Sage Weilafcdaea2009-10-14 14:27:38 -07002688 if (drop)
Sage Weila8599bd2009-10-06 11:31:12 -07002689 iput(inode);
2690}
2691
2692/*
2693 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
2694 * throw away our cap_snap.
2695 *
2696 * Caller hold s_mutex.
2697 */
Sage Weil6df058c2009-12-22 11:24:33 -08002698static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
Sage Weila8599bd2009-10-06 11:31:12 -07002699 struct ceph_mds_caps *m,
2700 struct ceph_mds_session *session)
2701{
2702 struct ceph_inode_info *ci = ceph_inode(inode);
2703 u64 follows = le64_to_cpu(m->snap_follows);
Sage Weila8599bd2009-10-06 11:31:12 -07002704 struct ceph_cap_snap *capsnap;
2705 int drop = 0;
2706
2707 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
2708 inode, ci, session->s_mds, follows);
2709
Sage Weilbe655592011-11-30 09:47:09 -08002710 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002711 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2712 if (capsnap->follows == follows) {
2713 if (capsnap->flush_tid != flush_tid) {
2714 dout(" cap_snap %p follows %lld tid %lld !="
2715 " %lld\n", capsnap, follows,
2716 flush_tid, capsnap->flush_tid);
2717 break;
2718 }
2719 WARN_ON(capsnap->dirty_pages || capsnap->writing);
Sage Weil819ccbf2010-04-01 09:33:46 -07002720 dout(" removing %p cap_snap %p follows %lld\n",
2721 inode, capsnap, follows);
Sage Weila8599bd2009-10-06 11:31:12 -07002722 ceph_put_snap_context(capsnap->context);
2723 list_del(&capsnap->ci_item);
2724 list_del(&capsnap->flushing_item);
2725 ceph_put_cap_snap(capsnap);
2726 drop = 1;
2727 break;
2728 } else {
2729 dout(" skipping cap_snap %p follows %lld\n",
2730 capsnap, capsnap->follows);
2731 }
2732 }
Sage Weilbe655592011-11-30 09:47:09 -08002733 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002734 if (drop)
2735 iput(inode);
2736}
2737
2738/*
2739 * Handle TRUNC from MDS, indicating file truncation.
2740 *
2741 * caller hold s_mutex.
2742 */
2743static void handle_cap_trunc(struct inode *inode,
2744 struct ceph_mds_caps *trunc,
2745 struct ceph_mds_session *session)
Sage Weilbe655592011-11-30 09:47:09 -08002746 __releases(ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07002747{
2748 struct ceph_inode_info *ci = ceph_inode(inode);
2749 int mds = session->s_mds;
2750 int seq = le32_to_cpu(trunc->seq);
2751 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
2752 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
2753 u64 size = le64_to_cpu(trunc->size);
2754 int implemented = 0;
2755 int dirty = __ceph_caps_dirty(ci);
2756 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
2757 int queue_trunc = 0;
2758
2759 issued |= implemented | dirty;
2760
2761 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
2762 inode, mds, seq, truncate_size, truncate_seq);
2763 queue_trunc = ceph_fill_file_size(inode, issued,
2764 truncate_seq, truncate_size, size);
Sage Weilbe655592011-11-30 09:47:09 -08002765 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002766
Milosz Tanski99ccbd22013-08-21 17:29:54 -04002767 if (queue_trunc) {
Sage Weil3c6f6b72010-02-09 15:24:44 -08002768 ceph_queue_vmtruncate(inode);
Milosz Tanski99ccbd22013-08-21 17:29:54 -04002769 ceph_fscache_invalidate(inode);
2770 }
Sage Weila8599bd2009-10-06 11:31:12 -07002771}
2772
2773/*
2774 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
2775 * different one. If we are the most recent migration we've seen (as
2776 * indicated by mseq), make note of the migrating cap bits for the
2777 * duration (until we see the corresponding IMPORT).
2778 *
2779 * caller holds s_mutex
2780 */
2781static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
Yan, Zheng11df2df2013-11-24 14:44:38 +08002782 struct ceph_mds_cap_peer *ph,
2783 struct ceph_mds_session *session)
Sage Weila8599bd2009-10-06 11:31:12 -07002784{
Sage Weildb354052011-05-24 11:46:31 -07002785 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
Yan, Zheng11df2df2013-11-24 14:44:38 +08002786 struct ceph_mds_session *tsession = NULL;
2787 struct ceph_cap *cap, *tcap;
Sage Weila8599bd2009-10-06 11:31:12 -07002788 struct ceph_inode_info *ci = ceph_inode(inode);
Yan, Zheng11df2df2013-11-24 14:44:38 +08002789 u64 t_cap_id;
Sage Weila8599bd2009-10-06 11:31:12 -07002790 unsigned mseq = le32_to_cpu(ex->migrate_seq);
Yan, Zheng11df2df2013-11-24 14:44:38 +08002791 unsigned t_seq, t_mseq;
2792 int target, issued;
2793 int mds = session->s_mds;
Sage Weila8599bd2009-10-06 11:31:12 -07002794
Yan, Zheng11df2df2013-11-24 14:44:38 +08002795 if (ph) {
2796 t_cap_id = le64_to_cpu(ph->cap_id);
2797 t_seq = le32_to_cpu(ph->seq);
2798 t_mseq = le32_to_cpu(ph->mseq);
2799 target = le32_to_cpu(ph->mds);
2800 } else {
2801 t_cap_id = t_seq = t_mseq = 0;
2802 target = -1;
Sage Weila8599bd2009-10-06 11:31:12 -07002803 }
2804
Yan, Zheng11df2df2013-11-24 14:44:38 +08002805 dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
2806 inode, ci, mds, mseq, target);
2807retry:
2808 spin_lock(&ci->i_ceph_lock);
2809 cap = __get_cap_for_mds(ci, mds);
2810 if (!cap)
2811 goto out_unlock;
Sage Weil154f42c2010-06-21 13:45:04 -07002812
Yan, Zheng11df2df2013-11-24 14:44:38 +08002813 if (target < 0) {
2814 __ceph_remove_cap(cap, false);
2815 goto out_unlock;
2816 }
Sage Weildb354052011-05-24 11:46:31 -07002817
Yan, Zheng11df2df2013-11-24 14:44:38 +08002818 /*
2819 * now we know we haven't received the cap import message yet
2820 * because the exported cap still exist.
2821 */
2822
2823 issued = cap->issued;
2824 WARN_ON(issued != cap->implemented);
2825
2826 tcap = __get_cap_for_mds(ci, target);
2827 if (tcap) {
2828 /* already have caps from the target */
2829 if (tcap->cap_id != t_cap_id ||
2830 ceph_seq_cmp(tcap->seq, t_seq) < 0) {
2831 dout(" updating import cap %p mds%d\n", tcap, target);
2832 tcap->cap_id = t_cap_id;
2833 tcap->seq = t_seq - 1;
2834 tcap->issue_seq = t_seq - 1;
2835 tcap->mseq = t_mseq;
2836 tcap->issued |= issued;
2837 tcap->implemented |= issued;
2838 if (cap == ci->i_auth_cap)
2839 ci->i_auth_cap = tcap;
2840 if (ci->i_flushing_caps && ci->i_auth_cap == tcap) {
2841 spin_lock(&mdsc->cap_dirty_lock);
2842 list_move_tail(&ci->i_flushing_item,
2843 &tcap->session->s_cap_flushing);
2844 spin_unlock(&mdsc->cap_dirty_lock);
Sage Weildb354052011-05-24 11:46:31 -07002845 }
Sage Weila8599bd2009-10-06 11:31:12 -07002846 }
Yan, Zhenga096b092013-09-22 10:15:58 +08002847 __ceph_remove_cap(cap, false);
Yan, Zheng11df2df2013-11-24 14:44:38 +08002848 goto out_unlock;
Sage Weila8599bd2009-10-06 11:31:12 -07002849 }
Yan, Zheng11df2df2013-11-24 14:44:38 +08002850
2851 if (tsession) {
2852 int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;
2853 spin_unlock(&ci->i_ceph_lock);
2854 /* add placeholder for the export tagert */
2855 ceph_add_cap(inode, tsession, t_cap_id, -1, issued, 0,
2856 t_seq - 1, t_mseq, (u64)-1, flag, NULL);
2857 goto retry;
2858 }
Sage Weila8599bd2009-10-06 11:31:12 -07002859
Sage Weilbe655592011-11-30 09:47:09 -08002860 spin_unlock(&ci->i_ceph_lock);
Yan, Zheng11df2df2013-11-24 14:44:38 +08002861 mutex_unlock(&session->s_mutex);
2862
2863 /* open target session */
2864 tsession = ceph_mdsc_open_export_target_session(mdsc, target);
2865 if (!IS_ERR(tsession)) {
2866 if (mds > target) {
2867 mutex_lock(&session->s_mutex);
2868 mutex_lock_nested(&tsession->s_mutex,
2869 SINGLE_DEPTH_NESTING);
2870 } else {
2871 mutex_lock(&tsession->s_mutex);
2872 mutex_lock_nested(&session->s_mutex,
2873 SINGLE_DEPTH_NESTING);
2874 }
2875 ceph_add_cap_releases(mdsc, tsession);
2876 } else {
2877 WARN_ON(1);
2878 tsession = NULL;
2879 target = -1;
2880 }
2881 goto retry;
2882
2883out_unlock:
2884 spin_unlock(&ci->i_ceph_lock);
2885 mutex_unlock(&session->s_mutex);
2886 if (tsession) {
2887 mutex_unlock(&tsession->s_mutex);
2888 ceph_put_mds_session(tsession);
2889 }
Sage Weila8599bd2009-10-06 11:31:12 -07002890}
2891
2892/*
2893 * Handle cap IMPORT. If there are temp bits from an older EXPORT,
2894 * clean them up.
2895 *
2896 * caller holds s_mutex.
2897 */
2898static void handle_cap_import(struct ceph_mds_client *mdsc,
2899 struct inode *inode, struct ceph_mds_caps *im,
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002900 struct ceph_mds_cap_peer *ph,
Sage Weila8599bd2009-10-06 11:31:12 -07002901 struct ceph_mds_session *session,
2902 void *snaptrace, int snaptrace_len)
2903{
2904 struct ceph_inode_info *ci = ceph_inode(inode);
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002905 struct ceph_cap *cap;
Sage Weila8599bd2009-10-06 11:31:12 -07002906 int mds = session->s_mds;
2907 unsigned issued = le32_to_cpu(im->caps);
2908 unsigned wanted = le32_to_cpu(im->wanted);
2909 unsigned seq = le32_to_cpu(im->seq);
2910 unsigned mseq = le32_to_cpu(im->migrate_seq);
2911 u64 realmino = le64_to_cpu(im->realm);
2912 u64 cap_id = le64_to_cpu(im->cap_id);
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002913 u64 p_cap_id;
2914 int peer;
Sage Weila8599bd2009-10-06 11:31:12 -07002915
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002916 if (ph) {
2917 p_cap_id = le64_to_cpu(ph->cap_id);
2918 peer = le32_to_cpu(ph->mds);
Sage Weila8599bd2009-10-06 11:31:12 -07002919 } else {
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002920 p_cap_id = 0;
2921 peer = -1;
Sage Weila8599bd2009-10-06 11:31:12 -07002922 }
2923
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002924 dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
2925 inode, ci, mds, mseq, peer);
2926
2927 spin_lock(&ci->i_ceph_lock);
2928 cap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
2929 if (cap && cap->cap_id == p_cap_id) {
2930 dout(" remove export cap %p mds%d flags %d\n",
2931 cap, peer, ph->flags);
2932 if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
2933 (cap->seq != le32_to_cpu(ph->seq) ||
2934 cap->mseq != le32_to_cpu(ph->mseq))) {
2935 pr_err("handle_cap_import: mismatched seq/mseq: "
2936 "ino (%llx.%llx) mds%d seq %d mseq %d "
2937 "importer mds%d has peer seq %d mseq %d\n",
2938 ceph_vinop(inode), peer, cap->seq,
2939 cap->mseq, mds, le32_to_cpu(ph->seq),
2940 le32_to_cpu(ph->mseq));
2941 }
2942 ci->i_cap_exporting_issued = cap->issued;
2943 __ceph_remove_cap(cap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
2944 }
2945
2946 /* make sure we re-request max_size, if necessary */
2947 ci->i_wanted_max_size = 0;
2948 ci->i_requested_max_size = 0;
2949 spin_unlock(&ci->i_ceph_lock);
2950
Sage Weila8599bd2009-10-06 11:31:12 -07002951 down_write(&mdsc->snap_rwsem);
2952 ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len,
2953 false);
2954 downgrade_write(&mdsc->snap_rwsem);
2955 ceph_add_cap(inode, session, cap_id, -1,
2956 issued, wanted, seq, mseq, realmino, CEPH_CAP_FLAG_AUTH,
2957 NULL /* no caps context */);
Sage Weil088b3f52011-01-18 08:56:01 -08002958 kick_flushing_inode_caps(mdsc, session, inode);
Sage Weila8599bd2009-10-06 11:31:12 -07002959 up_read(&mdsc->snap_rwsem);
Sage Weilfeb4cc92010-11-07 09:39:00 -08002960
Sage Weila8599bd2009-10-06 11:31:12 -07002961}
2962
2963/*
2964 * Handle a caps message from the MDS.
2965 *
2966 * Identify the appropriate session, inode, and call the right handler
2967 * based on the cap op.
2968 */
2969void ceph_handle_caps(struct ceph_mds_session *session,
2970 struct ceph_msg *msg)
2971{
2972 struct ceph_mds_client *mdsc = session->s_mdsc;
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002973 struct super_block *sb = mdsc->fsc->sb;
Sage Weila8599bd2009-10-06 11:31:12 -07002974 struct inode *inode;
Sage Weilbe655592011-11-30 09:47:09 -08002975 struct ceph_inode_info *ci;
Sage Weila8599bd2009-10-06 11:31:12 -07002976 struct ceph_cap *cap;
2977 struct ceph_mds_caps *h;
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002978 struct ceph_mds_cap_peer *peer = NULL;
Sage Weil2600d2d2010-02-22 15:12:16 -08002979 int mds = session->s_mds;
Sage Weila8599bd2009-10-06 11:31:12 -07002980 int op;
Sage Weil3d7ded42010-06-09 16:47:10 -07002981 u32 seq, mseq;
Sage Weila8599bd2009-10-06 11:31:12 -07002982 struct ceph_vino vino;
2983 u64 cap_id;
2984 u64 size, max_size;
Sage Weil6df058c2009-12-22 11:24:33 -08002985 u64 tid;
Sage Weil70edb552010-03-01 13:20:50 -08002986 void *snaptrace;
Sage Weilce1fbc82010-08-02 15:09:39 -07002987 size_t snaptrace_len;
2988 void *flock;
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002989 void *end;
Sage Weilce1fbc82010-08-02 15:09:39 -07002990 u32 flock_len;
Sage Weila8599bd2009-10-06 11:31:12 -07002991
2992 dout("handle_caps from mds%d\n", mds);
2993
2994 /* decode */
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002995 end = msg->front.iov_base + msg->front.iov_len;
Sage Weil6df058c2009-12-22 11:24:33 -08002996 tid = le64_to_cpu(msg->hdr.tid);
Sage Weila8599bd2009-10-06 11:31:12 -07002997 if (msg->front.iov_len < sizeof(*h))
2998 goto bad;
2999 h = msg->front.iov_base;
3000 op = le32_to_cpu(h->op);
3001 vino.ino = le64_to_cpu(h->ino);
3002 vino.snap = CEPH_NOSNAP;
3003 cap_id = le64_to_cpu(h->cap_id);
3004 seq = le32_to_cpu(h->seq);
Sage Weil3d7ded42010-06-09 16:47:10 -07003005 mseq = le32_to_cpu(h->migrate_seq);
Sage Weila8599bd2009-10-06 11:31:12 -07003006 size = le64_to_cpu(h->size);
3007 max_size = le64_to_cpu(h->max_size);
3008
Sage Weilce1fbc82010-08-02 15:09:39 -07003009 snaptrace = h + 1;
3010 snaptrace_len = le32_to_cpu(h->snap_trace_len);
3011
3012 if (le16_to_cpu(msg->hdr.version) >= 2) {
Yan, Zheng4ee6a912013-11-24 14:43:46 +08003013 void *p = snaptrace + snaptrace_len;
Sage Weilce1fbc82010-08-02 15:09:39 -07003014 ceph_decode_32_safe(&p, end, flock_len, bad);
Yan, Zheng4ee6a912013-11-24 14:43:46 +08003015 if (p + flock_len > end)
3016 goto bad;
Sage Weilce1fbc82010-08-02 15:09:39 -07003017 flock = p;
3018 } else {
3019 flock = NULL;
3020 flock_len = 0;
3021 }
3022
Yan, Zheng4ee6a912013-11-24 14:43:46 +08003023 if (le16_to_cpu(msg->hdr.version) >= 3) {
3024 if (op == CEPH_CAP_OP_IMPORT) {
3025 void *p = flock + flock_len;
3026 if (p + sizeof(*peer) > end)
3027 goto bad;
3028 peer = p;
Yan, Zheng11df2df2013-11-24 14:44:38 +08003029 } else if (op == CEPH_CAP_OP_EXPORT) {
3030 /* recorded in unused fields */
3031 peer = (void *)&h->size;
Yan, Zheng4ee6a912013-11-24 14:43:46 +08003032 }
3033 }
3034
Sage Weila8599bd2009-10-06 11:31:12 -07003035 mutex_lock(&session->s_mutex);
3036 session->s_seq++;
3037 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
3038 (unsigned)seq);
3039
Yan, Zheng66f58692013-01-04 14:45:18 +08003040 if (op == CEPH_CAP_OP_IMPORT)
3041 ceph_add_cap_releases(mdsc, session);
3042
Sage Weila8599bd2009-10-06 11:31:12 -07003043 /* lookup ino */
3044 inode = ceph_find_inode(sb, vino);
Sage Weilbe655592011-11-30 09:47:09 -08003045 ci = ceph_inode(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07003046 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
3047 vino.snap, inode);
3048 if (!inode) {
3049 dout(" i don't have ino %llx\n", vino.ino);
Sage Weil3d7ded42010-06-09 16:47:10 -07003050
Yan, Zhenga096b092013-09-22 10:15:58 +08003051 if (op == CEPH_CAP_OP_IMPORT) {
3052 spin_lock(&session->s_cap_lock);
Sage Weil3d7ded42010-06-09 16:47:10 -07003053 __queue_cap_release(session, vino.ino, cap_id,
3054 mseq, seq);
Yan, Zhenga096b092013-09-22 10:15:58 +08003055 spin_unlock(&session->s_cap_lock);
3056 }
Greg Farnum21b559d2010-10-06 15:46:30 -07003057 goto flush_cap_releases;
Sage Weila8599bd2009-10-06 11:31:12 -07003058 }
3059
3060 /* these will work even if we don't have a cap yet */
3061 switch (op) {
3062 case CEPH_CAP_OP_FLUSHSNAP_ACK:
Sage Weil6df058c2009-12-22 11:24:33 -08003063 handle_cap_flushsnap_ack(inode, tid, h, session);
Sage Weila8599bd2009-10-06 11:31:12 -07003064 goto done;
3065
3066 case CEPH_CAP_OP_EXPORT:
Yan, Zheng11df2df2013-11-24 14:44:38 +08003067 handle_cap_export(inode, h, peer, session);
3068 goto done_unlocked;
Sage Weila8599bd2009-10-06 11:31:12 -07003069
3070 case CEPH_CAP_OP_IMPORT:
Yan, Zheng4ee6a912013-11-24 14:43:46 +08003071 handle_cap_import(mdsc, inode, h, peer, session,
Sage Weilce1fbc82010-08-02 15:09:39 -07003072 snaptrace, snaptrace_len);
Sage Weila8599bd2009-10-06 11:31:12 -07003073 }
3074
3075 /* the rest require a cap */
Sage Weilbe655592011-11-30 09:47:09 -08003076 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07003077 cap = __get_cap_for_mds(ceph_inode(inode), mds);
3078 if (!cap) {
Sage Weil9dbd4122010-06-10 13:21:20 -07003079 dout(" no cap on %p ino %llx.%llx from mds%d\n",
Sage Weila8599bd2009-10-06 11:31:12 -07003080 inode, ceph_ino(inode), ceph_snap(inode), mds);
Sage Weilbe655592011-11-30 09:47:09 -08003081 spin_unlock(&ci->i_ceph_lock);
Greg Farnum21b559d2010-10-06 15:46:30 -07003082 goto flush_cap_releases;
Sage Weila8599bd2009-10-06 11:31:12 -07003083 }
3084
Sage Weilbe655592011-11-30 09:47:09 -08003085 /* note that each of these drops i_ceph_lock for us */
Sage Weila8599bd2009-10-06 11:31:12 -07003086 switch (op) {
3087 case CEPH_CAP_OP_REVOKE:
3088 case CEPH_CAP_OP_GRANT:
Yan, Zheng0e5e1772012-11-19 10:49:09 +08003089 case CEPH_CAP_OP_IMPORT:
Sage Weil15637c82010-03-16 13:42:00 -07003090 handle_cap_grant(inode, h, session, cap, msg->middle);
3091 goto done_unlocked;
Sage Weila8599bd2009-10-06 11:31:12 -07003092
3093 case CEPH_CAP_OP_FLUSH_ACK:
Sage Weil6df058c2009-12-22 11:24:33 -08003094 handle_cap_flush_ack(inode, tid, h, session, cap);
Sage Weila8599bd2009-10-06 11:31:12 -07003095 break;
3096
3097 case CEPH_CAP_OP_TRUNC:
3098 handle_cap_trunc(inode, h, session);
3099 break;
3100
3101 default:
Sage Weilbe655592011-11-30 09:47:09 -08003102 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07003103 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
3104 ceph_cap_op_name(op));
3105 }
3106
Greg Farnum21b559d2010-10-06 15:46:30 -07003107 goto done;
3108
3109flush_cap_releases:
3110 /*
3111 * send any full release message to try to move things
3112 * along for the mds (who clearly thinks we still have this
3113 * cap).
3114 */
3115 ceph_add_cap_releases(mdsc, session);
3116 ceph_send_cap_releases(mdsc, session);
3117
Sage Weila8599bd2009-10-06 11:31:12 -07003118done:
Sage Weil15637c82010-03-16 13:42:00 -07003119 mutex_unlock(&session->s_mutex);
3120done_unlocked:
Sage Weila8599bd2009-10-06 11:31:12 -07003121 if (inode)
3122 iput(inode);
3123 return;
3124
3125bad:
3126 pr_err("ceph_handle_caps: corrupt message\n");
Sage Weil9ec7cab2009-12-14 15:13:47 -08003127 ceph_msg_dump(msg);
Sage Weila8599bd2009-10-06 11:31:12 -07003128 return;
3129}
3130
3131/*
3132 * Delayed work handler to process end of delayed cap release LRU list.
3133 */
Sage Weilafcdaea2009-10-14 14:27:38 -07003134void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
Sage Weila8599bd2009-10-06 11:31:12 -07003135{
3136 struct ceph_inode_info *ci;
3137 int flags = CHECK_CAPS_NODELAY;
3138
Sage Weila8599bd2009-10-06 11:31:12 -07003139 dout("check_delayed_caps\n");
3140 while (1) {
3141 spin_lock(&mdsc->cap_delay_lock);
3142 if (list_empty(&mdsc->cap_delay_list))
3143 break;
3144 ci = list_first_entry(&mdsc->cap_delay_list,
3145 struct ceph_inode_info,
3146 i_cap_delay_list);
3147 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
3148 time_before(jiffies, ci->i_hold_caps_max))
3149 break;
3150 list_del_init(&ci->i_cap_delay_list);
3151 spin_unlock(&mdsc->cap_delay_lock);
3152 dout("check_delayed_caps on %p\n", &ci->vfs_inode);
3153 ceph_check_caps(ci, flags, NULL);
3154 }
3155 spin_unlock(&mdsc->cap_delay_lock);
3156}
3157
3158/*
Sage Weilafcdaea2009-10-14 14:27:38 -07003159 * Flush all dirty caps to the mds
3160 */
3161void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
3162{
Sage Weildb354052011-05-24 11:46:31 -07003163 struct ceph_inode_info *ci;
3164 struct inode *inode;
Sage Weilafcdaea2009-10-14 14:27:38 -07003165
3166 dout("flush_dirty_caps\n");
3167 spin_lock(&mdsc->cap_dirty_lock);
Sage Weildb354052011-05-24 11:46:31 -07003168 while (!list_empty(&mdsc->cap_dirty)) {
3169 ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info,
3170 i_dirty_item);
Sage Weil70b666c2011-05-27 09:24:26 -07003171 inode = &ci->vfs_inode;
3172 ihold(inode);
Sage Weildb354052011-05-24 11:46:31 -07003173 dout("flush_dirty_caps %p\n", inode);
Sage Weilafcdaea2009-10-14 14:27:38 -07003174 spin_unlock(&mdsc->cap_dirty_lock);
Sage Weil70b666c2011-05-27 09:24:26 -07003175 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL);
3176 iput(inode);
Sage Weilafcdaea2009-10-14 14:27:38 -07003177 spin_lock(&mdsc->cap_dirty_lock);
3178 }
3179 spin_unlock(&mdsc->cap_dirty_lock);
Sage Weildb354052011-05-24 11:46:31 -07003180 dout("flush_dirty_caps done\n");
Sage Weilafcdaea2009-10-14 14:27:38 -07003181}
3182
3183/*
Sage Weila8599bd2009-10-06 11:31:12 -07003184 * Drop open file reference. If we were the last open file,
3185 * we may need to release capabilities to the MDS (or schedule
3186 * their delayed release).
3187 */
3188void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
3189{
3190 struct inode *inode = &ci->vfs_inode;
3191 int last = 0;
3192
Sage Weilbe655592011-11-30 09:47:09 -08003193 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07003194 dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode,
3195 ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1);
3196 BUG_ON(ci->i_nr_by_mode[fmode] == 0);
3197 if (--ci->i_nr_by_mode[fmode] == 0)
3198 last++;
Sage Weilbe655592011-11-30 09:47:09 -08003199 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07003200
3201 if (last && ci->i_vino.snap == CEPH_NOSNAP)
3202 ceph_check_caps(ci, 0, NULL);
3203}
3204
3205/*
3206 * Helpers for embedding cap and dentry lease releases into mds
3207 * requests.
3208 *
3209 * @force is used by dentry_release (below) to force inclusion of a
3210 * record for the directory inode, even when there aren't any caps to
3211 * drop.
3212 */
3213int ceph_encode_inode_release(void **p, struct inode *inode,
3214 int mds, int drop, int unless, int force)
3215{
3216 struct ceph_inode_info *ci = ceph_inode(inode);
3217 struct ceph_cap *cap;
3218 struct ceph_mds_request_release *rel = *p;
Sage Weilec97f882010-06-24 15:12:37 -07003219 int used, dirty;
Sage Weila8599bd2009-10-06 11:31:12 -07003220 int ret = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07003221
Sage Weilbe655592011-11-30 09:47:09 -08003222 spin_lock(&ci->i_ceph_lock);
Sage Weil916623d2010-03-16 15:01:07 -07003223 used = __ceph_caps_used(ci);
Sage Weilec97f882010-06-24 15:12:37 -07003224 dirty = __ceph_caps_dirty(ci);
Sage Weil916623d2010-03-16 15:01:07 -07003225
Sage Weilec97f882010-06-24 15:12:37 -07003226 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
3227 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
Sage Weil916623d2010-03-16 15:01:07 -07003228 ceph_cap_string(unless));
3229
Sage Weilec97f882010-06-24 15:12:37 -07003230 /* only drop unused, clean caps */
3231 drop &= ~(used | dirty);
Sage Weil916623d2010-03-16 15:01:07 -07003232
Sage Weila8599bd2009-10-06 11:31:12 -07003233 cap = __get_cap_for_mds(ci, mds);
3234 if (cap && __cap_is_valid(cap)) {
3235 if (force ||
3236 ((cap->issued & drop) &&
3237 (cap->issued & unless) == 0)) {
3238 if ((cap->issued & drop) &&
3239 (cap->issued & unless) == 0) {
Yan, Zhengbb137f82013-06-03 18:22:17 +08003240 int wanted = __ceph_caps_wanted(ci);
3241 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0)
3242 wanted |= cap->mds_wanted;
3243 dout("encode_inode_release %p cap %p "
3244 "%s -> %s, wanted %s -> %s\n", inode, cap,
Sage Weila8599bd2009-10-06 11:31:12 -07003245 ceph_cap_string(cap->issued),
Yan, Zhengbb137f82013-06-03 18:22:17 +08003246 ceph_cap_string(cap->issued & ~drop),
3247 ceph_cap_string(cap->mds_wanted),
3248 ceph_cap_string(wanted));
3249
Sage Weila8599bd2009-10-06 11:31:12 -07003250 cap->issued &= ~drop;
3251 cap->implemented &= ~drop;
Yan, Zhengbb137f82013-06-03 18:22:17 +08003252 cap->mds_wanted = wanted;
Sage Weila8599bd2009-10-06 11:31:12 -07003253 } else {
3254 dout("encode_inode_release %p cap %p %s"
3255 " (force)\n", inode, cap,
3256 ceph_cap_string(cap->issued));
3257 }
3258
3259 rel->ino = cpu_to_le64(ceph_ino(inode));
3260 rel->cap_id = cpu_to_le64(cap->cap_id);
3261 rel->seq = cpu_to_le32(cap->seq);
3262 rel->issue_seq = cpu_to_le32(cap->issue_seq),
3263 rel->mseq = cpu_to_le32(cap->mseq);
Yan, Zhengfd7b95c2014-04-17 08:02:02 +08003264 rel->caps = cpu_to_le32(cap->implemented);
Sage Weila8599bd2009-10-06 11:31:12 -07003265 rel->wanted = cpu_to_le32(cap->mds_wanted);
3266 rel->dname_len = 0;
3267 rel->dname_seq = 0;
3268 *p += sizeof(*rel);
3269 ret = 1;
3270 } else {
3271 dout("encode_inode_release %p cap %p %s\n",
3272 inode, cap, ceph_cap_string(cap->issued));
3273 }
3274 }
Sage Weilbe655592011-11-30 09:47:09 -08003275 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07003276 return ret;
3277}
3278
3279int ceph_encode_dentry_release(void **p, struct dentry *dentry,
3280 int mds, int drop, int unless)
3281{
3282 struct inode *dir = dentry->d_parent->d_inode;
3283 struct ceph_mds_request_release *rel = *p;
3284 struct ceph_dentry_info *di = ceph_dentry(dentry);
3285 int force = 0;
3286 int ret;
3287
3288 /*
3289 * force an record for the directory caps if we have a dentry lease.
Sage Weilbe655592011-11-30 09:47:09 -08003290 * this is racy (can't take i_ceph_lock and d_lock together), but it
Sage Weila8599bd2009-10-06 11:31:12 -07003291 * doesn't have to be perfect; the mds will revoke anything we don't
3292 * release.
3293 */
3294 spin_lock(&dentry->d_lock);
3295 if (di->lease_session && di->lease_session->s_mds == mds)
3296 force = 1;
3297 spin_unlock(&dentry->d_lock);
3298
3299 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
3300
3301 spin_lock(&dentry->d_lock);
3302 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
3303 dout("encode_dentry_release %p mds%d seq %d\n",
3304 dentry, mds, (int)di->lease_seq);
3305 rel->dname_len = cpu_to_le32(dentry->d_name.len);
3306 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
3307 *p += dentry->d_name.len;
3308 rel->dname_seq = cpu_to_le32(di->lease_seq);
Sage Weil1dadcce2010-07-23 13:54:21 -07003309 __ceph_mdsc_drop_dentry_lease(dentry);
Sage Weila8599bd2009-10-06 11:31:12 -07003310 }
3311 spin_unlock(&dentry->d_lock);
3312 return ret;
3313}