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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
Yan, Zhengd9df2782014-04-18 09:57:11 +0800224struct ceph_cap *ceph_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 */
Yan, Zhengd9df2782014-04-18 09:57:11 +0800511void 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 **new_cap)
Sage Weila8599bd2009-10-06 11:31:12 -0700516{
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);
Sage Weila8599bd2009-10-06 11:31:12 -0700519 struct ceph_cap *cap;
520 int mds = session->s_mds;
521 int actual_wanted;
522
523 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
524 session->s_mds, cap_id, ceph_cap_string(issued), seq);
525
526 /*
527 * If we are opening the file, include file mode wanted bits
528 * in wanted.
529 */
530 if (fmode >= 0)
531 wanted |= ceph_caps_for_mode(fmode);
532
Sage Weila8599bd2009-10-06 11:31:12 -0700533 cap = __get_cap_for_mds(ci, mds);
534 if (!cap) {
Yan, Zhengd9df2782014-04-18 09:57:11 +0800535 cap = *new_cap;
536 *new_cap = NULL;
Sage Weila8599bd2009-10-06 11:31:12 -0700537
538 cap->issued = 0;
539 cap->implemented = 0;
540 cap->mds = mds;
541 cap->mds_wanted = 0;
Yan, Zheng964266c2013-02-27 09:26:09 +0800542 cap->mseq = 0;
Sage Weila8599bd2009-10-06 11:31:12 -0700543
544 cap->ci = ci;
545 __insert_cap_node(ci, cap);
546
Sage Weila8599bd2009-10-06 11:31:12 -0700547 /* add to session cap list */
548 cap->session = session;
549 spin_lock(&session->s_cap_lock);
550 list_add_tail(&cap->session_caps, &session->s_caps);
551 session->s_nr_caps++;
552 spin_unlock(&session->s_cap_lock);
Yan, Zheng11df2df2013-11-24 14:44:38 +0800553 } else {
Yan, Zheng11df2df2013-11-24 14:44:38 +0800554 /*
555 * auth mds of the inode changed. we received the cap export
556 * message, but still haven't received the cap import message.
557 * handle_cap_export() updated the new auth MDS' cap.
558 *
559 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
560 * a message that was send before the cap import message. So
561 * don't remove caps.
562 */
563 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
564 WARN_ON(cap != ci->i_auth_cap);
565 WARN_ON(cap->cap_id != cap_id);
566 seq = cap->seq;
567 mseq = cap->mseq;
568 issued |= cap->issued;
569 flags |= CEPH_CAP_FLAG_AUTH;
570 }
571 }
Sage Weila8599bd2009-10-06 11:31:12 -0700572
573 if (!ci->i_snap_realm) {
574 /*
575 * add this inode to the appropriate snap realm
576 */
577 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
578 realmino);
579 if (realm) {
580 ceph_get_snap_realm(mdsc, realm);
581 spin_lock(&realm->inodes_with_caps_lock);
582 ci->i_snap_realm = realm;
583 list_add(&ci->i_snap_realm_item,
584 &realm->inodes_with_caps);
585 spin_unlock(&realm->inodes_with_caps_lock);
586 } else {
587 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
588 realmino);
Sage Weilb8cd07e2010-07-16 12:00:02 -0700589 WARN_ON(!realm);
Sage Weila8599bd2009-10-06 11:31:12 -0700590 }
591 }
592
593 __check_cap_issue(ci, cap, issued);
594
595 /*
596 * If we are issued caps we don't want, or the mds' wanted
597 * value appears to be off, queue a check so we'll release
598 * later and/or update the mds wanted value.
599 */
600 actual_wanted = __ceph_caps_wanted(ci);
601 if ((wanted & ~actual_wanted) ||
602 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
603 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
604 ceph_cap_string(issued), ceph_cap_string(wanted),
605 ceph_cap_string(actual_wanted));
606 __cap_delay_requeue(mdsc, ci);
607 }
608
Yan, Zhengb8c2f3a2013-05-31 16:37:11 +0800609 if (flags & CEPH_CAP_FLAG_AUTH) {
610 if (ci->i_auth_cap == NULL ||
Yan, Zhengd9ffc4f2014-03-18 10:15:29 +0800611 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
Yan, Zhengb8c2f3a2013-05-31 16:37:11 +0800612 ci->i_auth_cap = cap;
Yan, Zhengd9ffc4f2014-03-18 10:15:29 +0800613 cap->mds_wanted = wanted;
614 }
Yan, Zheng11df2df2013-11-24 14:44:38 +0800615 } else {
616 WARN_ON(ci->i_auth_cap == cap);
Yan, Zheng8a92a112013-01-04 14:28:07 +0800617 }
Sage Weila8599bd2009-10-06 11:31:12 -0700618
619 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
620 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
621 ceph_cap_string(issued|cap->issued), seq, mds);
622 cap->cap_id = cap_id;
623 cap->issued = issued;
624 cap->implemented |= issued;
Yan, Zhengd1b87802013-11-13 14:47:19 +0800625 if (ceph_seq_cmp(mseq, cap->mseq) > 0)
Yan, Zheng964266c2013-02-27 09:26:09 +0800626 cap->mds_wanted = wanted;
627 else
628 cap->mds_wanted |= wanted;
Sage Weila8599bd2009-10-06 11:31:12 -0700629 cap->seq = seq;
630 cap->issue_seq = seq;
631 cap->mseq = mseq;
Sage Weil685f9a5d2009-11-09 12:05:48 -0800632 cap->cap_gen = session->s_cap_gen;
Sage Weila8599bd2009-10-06 11:31:12 -0700633
634 if (fmode >= 0)
635 __ceph_get_fmode(ci, fmode);
Sage Weila8599bd2009-10-06 11:31:12 -0700636}
637
638/*
639 * Return true if cap has not timed out and belongs to the current
640 * generation of the MDS session (i.e. has not gone 'stale' due to
641 * us losing touch with the mds).
642 */
643static int __cap_is_valid(struct ceph_cap *cap)
644{
645 unsigned long ttl;
Sage Weilcdac8302009-11-10 16:02:23 -0800646 u32 gen;
Sage Weila8599bd2009-10-06 11:31:12 -0700647
Alex Elderd8fb02a2012-01-12 17:48:10 -0800648 spin_lock(&cap->session->s_gen_ttl_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700649 gen = cap->session->s_cap_gen;
650 ttl = cap->session->s_cap_ttl;
Alex Elderd8fb02a2012-01-12 17:48:10 -0800651 spin_unlock(&cap->session->s_gen_ttl_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700652
Sage Weil685f9a5d2009-11-09 12:05:48 -0800653 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
Sage Weila8599bd2009-10-06 11:31:12 -0700654 dout("__cap_is_valid %p cap %p issued %s "
655 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
Sage Weil685f9a5d2009-11-09 12:05:48 -0800656 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
Sage Weila8599bd2009-10-06 11:31:12 -0700657 return 0;
658 }
659
660 return 1;
661}
662
663/*
664 * Return set of valid cap bits issued to us. Note that caps time
665 * out, and may be invalidated in bulk if the client session times out
666 * and session->s_cap_gen is bumped.
667 */
668int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
669{
Yan, Zhengd9df2782014-04-18 09:57:11 +0800670 int have = ci->i_snap_caps;
Sage Weila8599bd2009-10-06 11:31:12 -0700671 struct ceph_cap *cap;
672 struct rb_node *p;
673
674 if (implemented)
675 *implemented = 0;
676 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
677 cap = rb_entry(p, struct ceph_cap, ci_node);
678 if (!__cap_is_valid(cap))
679 continue;
680 dout("__ceph_caps_issued %p cap %p issued %s\n",
681 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
682 have |= cap->issued;
683 if (implemented)
684 *implemented |= cap->implemented;
685 }
Yan, Zhengb1530f52013-07-02 12:40:20 +0800686 /*
687 * exclude caps issued by non-auth MDS, but are been revoking
688 * by the auth MDS. The non-auth MDS should be revoking/exporting
689 * these caps, but the message is delayed.
690 */
691 if (ci->i_auth_cap) {
692 cap = ci->i_auth_cap;
693 have &= ~cap->implemented | cap->issued;
694 }
Sage Weila8599bd2009-10-06 11:31:12 -0700695 return have;
696}
697
698/*
699 * Get cap bits issued by caps other than @ocap
700 */
701int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
702{
703 int have = ci->i_snap_caps;
704 struct ceph_cap *cap;
705 struct rb_node *p;
706
707 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
708 cap = rb_entry(p, struct ceph_cap, ci_node);
709 if (cap == ocap)
710 continue;
711 if (!__cap_is_valid(cap))
712 continue;
713 have |= cap->issued;
714 }
715 return have;
716}
717
718/*
719 * Move a cap to the end of the LRU (oldest caps at list head, newest
720 * at list tail).
721 */
722static void __touch_cap(struct ceph_cap *cap)
723{
724 struct ceph_mds_session *s = cap->session;
725
Sage Weila8599bd2009-10-06 11:31:12 -0700726 spin_lock(&s->s_cap_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -0800727 if (s->s_cap_iterator == NULL) {
Sage Weil5dacf092009-12-21 20:40:34 -0800728 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
729 s->s_mds);
730 list_move_tail(&cap->session_caps, &s->s_caps);
731 } else {
732 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
733 &cap->ci->vfs_inode, cap, s->s_mds);
734 }
Sage Weila8599bd2009-10-06 11:31:12 -0700735 spin_unlock(&s->s_cap_lock);
736}
737
738/*
739 * Check if we hold the given mask. If so, move the cap(s) to the
740 * front of their respective LRUs. (This is the preferred way for
741 * callers to check for caps they want.)
742 */
743int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
744{
745 struct ceph_cap *cap;
746 struct rb_node *p;
747 int have = ci->i_snap_caps;
748
749 if ((have & mask) == mask) {
750 dout("__ceph_caps_issued_mask %p snap issued %s"
751 " (mask %s)\n", &ci->vfs_inode,
752 ceph_cap_string(have),
753 ceph_cap_string(mask));
754 return 1;
755 }
756
757 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
758 cap = rb_entry(p, struct ceph_cap, ci_node);
759 if (!__cap_is_valid(cap))
760 continue;
761 if ((cap->issued & mask) == mask) {
762 dout("__ceph_caps_issued_mask %p cap %p issued %s"
763 " (mask %s)\n", &ci->vfs_inode, cap,
764 ceph_cap_string(cap->issued),
765 ceph_cap_string(mask));
766 if (touch)
767 __touch_cap(cap);
768 return 1;
769 }
770
771 /* does a combination of caps satisfy mask? */
772 have |= cap->issued;
773 if ((have & mask) == mask) {
774 dout("__ceph_caps_issued_mask %p combo issued %s"
775 " (mask %s)\n", &ci->vfs_inode,
776 ceph_cap_string(cap->issued),
777 ceph_cap_string(mask));
778 if (touch) {
779 struct rb_node *q;
780
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300781 /* touch this + preceding caps */
Sage Weila8599bd2009-10-06 11:31:12 -0700782 __touch_cap(cap);
783 for (q = rb_first(&ci->i_caps); q != p;
784 q = rb_next(q)) {
785 cap = rb_entry(q, struct ceph_cap,
786 ci_node);
787 if (!__cap_is_valid(cap))
788 continue;
789 __touch_cap(cap);
790 }
791 }
792 return 1;
793 }
794 }
795
796 return 0;
797}
798
799/*
800 * Return true if mask caps are currently being revoked by an MDS.
801 */
Yan, Zheng6ee6b9532013-07-02 12:40:21 +0800802int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
803 struct ceph_cap *ocap, int mask)
804{
805 struct ceph_cap *cap;
806 struct rb_node *p;
807
808 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
809 cap = rb_entry(p, struct ceph_cap, ci_node);
Yan, Zheng9563f882013-11-22 13:50:45 +0800810 if (cap != ocap &&
Yan, Zheng6ee6b9532013-07-02 12:40:21 +0800811 (cap->implemented & ~cap->issued & mask))
812 return 1;
813 }
814 return 0;
815}
816
Sage Weila8599bd2009-10-06 11:31:12 -0700817int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
818{
819 struct inode *inode = &ci->vfs_inode;
Yan, Zheng6ee6b9532013-07-02 12:40:21 +0800820 int ret;
Sage Weila8599bd2009-10-06 11:31:12 -0700821
Sage Weilbe655592011-11-30 09:47:09 -0800822 spin_lock(&ci->i_ceph_lock);
Yan, Zheng6ee6b9532013-07-02 12:40:21 +0800823 ret = __ceph_caps_revoking_other(ci, NULL, mask);
Sage Weilbe655592011-11-30 09:47:09 -0800824 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -0700825 dout("ceph_caps_revoking %p %s = %d\n", inode,
826 ceph_cap_string(mask), ret);
827 return ret;
828}
829
830int __ceph_caps_used(struct ceph_inode_info *ci)
831{
832 int used = 0;
833 if (ci->i_pin_ref)
834 used |= CEPH_CAP_PIN;
835 if (ci->i_rd_ref)
836 used |= CEPH_CAP_FILE_RD;
Sage Weila43fb732010-09-17 09:54:08 -0700837 if (ci->i_rdcache_ref || ci->vfs_inode.i_data.nrpages)
Sage Weila8599bd2009-10-06 11:31:12 -0700838 used |= CEPH_CAP_FILE_CACHE;
839 if (ci->i_wr_ref)
840 used |= CEPH_CAP_FILE_WR;
Henry C Changd3d07202011-05-11 10:29:54 +0000841 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
Sage Weila8599bd2009-10-06 11:31:12 -0700842 used |= CEPH_CAP_FILE_BUFFER;
843 return used;
844}
845
846/*
847 * wanted, by virtue of open file modes
848 */
849int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
850{
851 int want = 0;
852 int mode;
Sage Weil33caad32010-05-26 14:31:27 -0700853 for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++)
Sage Weila8599bd2009-10-06 11:31:12 -0700854 if (ci->i_nr_by_mode[mode])
855 want |= ceph_caps_for_mode(mode);
856 return want;
857}
858
859/*
860 * Return caps we have registered with the MDS(s) as 'wanted'.
861 */
862int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
863{
864 struct ceph_cap *cap;
865 struct rb_node *p;
866 int mds_wanted = 0;
867
868 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
869 cap = rb_entry(p, struct ceph_cap, ci_node);
870 if (!__cap_is_valid(cap))
871 continue;
Yan, Zhenga2550602014-03-08 09:51:45 +0800872 if (cap == ci->i_auth_cap)
873 mds_wanted |= cap->mds_wanted;
874 else
875 mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
Sage Weila8599bd2009-10-06 11:31:12 -0700876 }
877 return mds_wanted;
878}
879
880/*
Sage Weilbe655592011-11-30 09:47:09 -0800881 * called under i_ceph_lock
Sage Weila8599bd2009-10-06 11:31:12 -0700882 */
883static int __ceph_is_any_caps(struct ceph_inode_info *ci)
884{
Yan, Zhengd9df2782014-04-18 09:57:11 +0800885 return !RB_EMPTY_ROOT(&ci->i_caps);
Sage Weila8599bd2009-10-06 11:31:12 -0700886}
887
Yan, Zheng9215aee2013-11-30 12:47:41 +0800888int ceph_is_any_caps(struct inode *inode)
889{
890 struct ceph_inode_info *ci = ceph_inode(inode);
891 int ret;
892
893 spin_lock(&ci->i_ceph_lock);
894 ret = __ceph_is_any_caps(ci);
895 spin_unlock(&ci->i_ceph_lock);
896
897 return ret;
898}
899
Sage Weila8599bd2009-10-06 11:31:12 -0700900/*
Sage Weilf818a732010-05-11 20:56:31 -0700901 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
902 *
Sage Weilbe655592011-11-30 09:47:09 -0800903 * caller should hold i_ceph_lock.
Sage Weila6369742010-02-22 13:59:00 -0800904 * caller will not hold session s_mutex if called from destroy_inode.
Sage Weila8599bd2009-10-06 11:31:12 -0700905 */
Yan, Zhenga096b092013-09-22 10:15:58 +0800906void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
Sage Weila8599bd2009-10-06 11:31:12 -0700907{
908 struct ceph_mds_session *session = cap->session;
909 struct ceph_inode_info *ci = cap->ci;
Cheng Renquan640ef792010-03-26 17:40:33 +0800910 struct ceph_mds_client *mdsc =
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700911 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
Sage Weilf818a732010-05-11 20:56:31 -0700912 int removed = 0;
Sage Weila8599bd2009-10-06 11:31:12 -0700913
914 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
915
Sage Weil7c1332b2010-02-16 11:39:45 -0800916 /* remove from session list */
917 spin_lock(&session->s_cap_lock);
Yan, Zheng99a9c272013-09-22 11:08:14 +0800918 /*
919 * s_cap_reconnect is protected by s_cap_lock. no one changes
920 * s_cap_gen while session is in the reconnect state.
921 */
922 if (queue_release &&
923 (!session->s_cap_reconnect ||
924 cap->cap_gen == session->s_cap_gen))
Yan, Zhenga096b092013-09-22 10:15:58 +0800925 __queue_cap_release(session, ci->i_vino.ino, cap->cap_id,
926 cap->mseq, cap->issue_seq);
927
Sage Weil7c1332b2010-02-16 11:39:45 -0800928 if (session->s_cap_iterator == cap) {
929 /* not yet, we are iterating over this very cap */
930 dout("__ceph_remove_cap delaying %p removal from session %p\n",
931 cap, cap->session);
932 } else {
933 list_del_init(&cap->session_caps);
934 session->s_nr_caps--;
935 cap->session = NULL;
Sage Weilf818a732010-05-11 20:56:31 -0700936 removed = 1;
Sage Weil7c1332b2010-02-16 11:39:45 -0800937 }
Sage Weilf818a732010-05-11 20:56:31 -0700938 /* protect backpointer with s_cap_lock: see iterate_session_caps */
939 cap->ci = NULL;
Sage Weil7c1332b2010-02-16 11:39:45 -0800940 spin_unlock(&session->s_cap_lock);
941
Sage Weilf818a732010-05-11 20:56:31 -0700942 /* remove from inode list */
943 rb_erase(&cap->ci_node, &ci->i_caps);
944 if (ci->i_auth_cap == cap)
945 ci->i_auth_cap = NULL;
946
947 if (removed)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700948 ceph_put_cap(mdsc, cap);
Sage Weila8599bd2009-10-06 11:31:12 -0700949
950 if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) {
951 struct ceph_snap_realm *realm = ci->i_snap_realm;
952 spin_lock(&realm->inodes_with_caps_lock);
953 list_del_init(&ci->i_snap_realm_item);
954 ci->i_snap_realm_counter++;
955 ci->i_snap_realm = NULL;
956 spin_unlock(&realm->inodes_with_caps_lock);
957 ceph_put_snap_realm(mdsc, realm);
958 }
959 if (!__ceph_is_any_real_caps(ci))
960 __cap_delay_cancel(mdsc, ci);
961}
962
963/*
964 * Build and send a cap message to the given MDS.
965 *
966 * Caller should be holding s_mutex.
967 */
968static int send_cap_msg(struct ceph_mds_session *session,
969 u64 ino, u64 cid, int op,
970 int caps, int wanted, int dirty,
971 u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq,
972 u64 size, u64 max_size,
973 struct timespec *mtime, struct timespec *atime,
974 u64 time_warp_seq,
Eric W. Biederman05cb11c2013-01-31 02:56:19 -0800975 kuid_t uid, kgid_t gid, umode_t mode,
Sage Weila8599bd2009-10-06 11:31:12 -0700976 u64 xattr_version,
977 struct ceph_buffer *xattrs_buf,
978 u64 follows)
979{
980 struct ceph_mds_caps *fc;
981 struct ceph_msg *msg;
982
983 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
984 " seq %u/%u mseq %u follows %lld size %llu/%llu"
985 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
986 cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
987 ceph_cap_string(dirty),
988 seq, issue_seq, mseq, follows, size, max_size,
989 xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
990
Sage Weilb61c2762011-08-09 15:03:46 -0700991 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), GFP_NOFS, false);
Sage Weila79832f2010-04-01 16:06:19 -0700992 if (!msg)
993 return -ENOMEM;
Sage Weila8599bd2009-10-06 11:31:12 -0700994
Sage Weil6df058c2009-12-22 11:24:33 -0800995 msg->hdr.tid = cpu_to_le64(flush_tid);
Sage Weila8599bd2009-10-06 11:31:12 -0700996
Sage Weil6df058c2009-12-22 11:24:33 -0800997 fc = msg->front.iov_base;
Sage Weila8599bd2009-10-06 11:31:12 -0700998 memset(fc, 0, sizeof(*fc));
999
1000 fc->cap_id = cpu_to_le64(cid);
1001 fc->op = cpu_to_le32(op);
1002 fc->seq = cpu_to_le32(seq);
Sage Weila8599bd2009-10-06 11:31:12 -07001003 fc->issue_seq = cpu_to_le32(issue_seq);
1004 fc->migrate_seq = cpu_to_le32(mseq);
1005 fc->caps = cpu_to_le32(caps);
1006 fc->wanted = cpu_to_le32(wanted);
1007 fc->dirty = cpu_to_le32(dirty);
1008 fc->ino = cpu_to_le64(ino);
1009 fc->snap_follows = cpu_to_le64(follows);
1010
1011 fc->size = cpu_to_le64(size);
1012 fc->max_size = cpu_to_le64(max_size);
1013 if (mtime)
1014 ceph_encode_timespec(&fc->mtime, mtime);
1015 if (atime)
1016 ceph_encode_timespec(&fc->atime, atime);
1017 fc->time_warp_seq = cpu_to_le32(time_warp_seq);
1018
Eric W. Biederman05cb11c2013-01-31 02:56:19 -08001019 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, uid));
1020 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, gid));
Sage Weila8599bd2009-10-06 11:31:12 -07001021 fc->mode = cpu_to_le32(mode);
1022
1023 fc->xattr_version = cpu_to_le64(xattr_version);
1024 if (xattrs_buf) {
1025 msg->middle = ceph_buffer_get(xattrs_buf);
1026 fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
1027 msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
1028 }
1029
1030 ceph_con_send(&session->s_con, msg);
1031 return 0;
1032}
1033
Yan, Zhengd40ee0d2013-02-18 13:43:43 +08001034void __queue_cap_release(struct ceph_mds_session *session,
1035 u64 ino, u64 cap_id, u32 migrate_seq,
1036 u32 issue_seq)
Sage Weil3d7ded42010-06-09 16:47:10 -07001037{
1038 struct ceph_msg *msg;
1039 struct ceph_mds_cap_release *head;
1040 struct ceph_mds_cap_item *item;
1041
Sage Weil3d7ded42010-06-09 16:47:10 -07001042 BUG_ON(!session->s_num_cap_releases);
1043 msg = list_first_entry(&session->s_cap_releases,
1044 struct ceph_msg, list_head);
1045
1046 dout(" adding %llx release to mds%d msg %p (%d left)\n",
1047 ino, session->s_mds, msg, session->s_num_cap_releases);
1048
1049 BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE);
1050 head = msg->front.iov_base;
Wei Yongjunb905a7f2012-09-28 12:59:16 +08001051 le32_add_cpu(&head->num, 1);
Sage Weil3d7ded42010-06-09 16:47:10 -07001052 item = msg->front.iov_base + msg->front.iov_len;
1053 item->ino = cpu_to_le64(ino);
1054 item->cap_id = cpu_to_le64(cap_id);
1055 item->migrate_seq = cpu_to_le32(migrate_seq);
1056 item->seq = cpu_to_le32(issue_seq);
1057
1058 session->s_num_cap_releases--;
1059
1060 msg->front.iov_len += sizeof(*item);
1061 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1062 dout(" release msg %p full\n", msg);
1063 list_move_tail(&msg->list_head, &session->s_cap_releases_done);
1064 } else {
1065 dout(" release msg %p at %d/%d (%d)\n", msg,
1066 (int)le32_to_cpu(head->num),
1067 (int)CEPH_CAPS_PER_RELEASE,
1068 (int)msg->front.iov_len);
1069 }
Sage Weil3d7ded42010-06-09 16:47:10 -07001070}
1071
Sage Weila8599bd2009-10-06 11:31:12 -07001072/*
Sage Weila6369742010-02-22 13:59:00 -08001073 * Queue cap releases when an inode is dropped from our cache. Since
Sage Weilbe655592011-11-30 09:47:09 -08001074 * inode is about to be destroyed, there is no need for i_ceph_lock.
Sage Weila8599bd2009-10-06 11:31:12 -07001075 */
1076void ceph_queue_caps_release(struct inode *inode)
1077{
1078 struct ceph_inode_info *ci = ceph_inode(inode);
1079 struct rb_node *p;
1080
Sage Weila8599bd2009-10-06 11:31:12 -07001081 p = rb_first(&ci->i_caps);
1082 while (p) {
1083 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
Sage Weila8599bd2009-10-06 11:31:12 -07001084 p = rb_next(p);
Yan, Zhenga096b092013-09-22 10:15:58 +08001085 __ceph_remove_cap(cap, true);
Sage Weila8599bd2009-10-06 11:31:12 -07001086 }
Sage Weila8599bd2009-10-06 11:31:12 -07001087}
1088
1089/*
1090 * Send a cap msg on the given inode. Update our caps state, then
Sage Weilbe655592011-11-30 09:47:09 -08001091 * drop i_ceph_lock and send the message.
Sage Weila8599bd2009-10-06 11:31:12 -07001092 *
1093 * Make note of max_size reported/requested from mds, revoked caps
1094 * that have now been implemented.
1095 *
1096 * Make half-hearted attempt ot to invalidate page cache if we are
1097 * dropping RDCACHE. Note that this will leave behind locked pages
1098 * that we'll then need to deal with elsewhere.
1099 *
1100 * Return non-zero if delayed release, or we experienced an error
1101 * such that the caller should requeue + retry later.
1102 *
Sage Weilbe655592011-11-30 09:47:09 -08001103 * called with i_ceph_lock, then drops it.
Sage Weila8599bd2009-10-06 11:31:12 -07001104 * caller should hold snap_rwsem (read), s_mutex.
1105 */
1106static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
1107 int op, int used, int want, int retain, int flushing,
1108 unsigned *pflush_tid)
Sage Weilbe655592011-11-30 09:47:09 -08001109 __releases(cap->ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07001110{
1111 struct ceph_inode_info *ci = cap->ci;
1112 struct inode *inode = &ci->vfs_inode;
1113 u64 cap_id = cap->cap_id;
Sage Weil68c28322010-02-09 13:41:47 -08001114 int held, revoking, dropping, keep;
Sage Weila8599bd2009-10-06 11:31:12 -07001115 u64 seq, issue_seq, mseq, time_warp_seq, follows;
1116 u64 size, max_size;
1117 struct timespec mtime, atime;
1118 int wake = 0;
Al Viro5706b272011-07-26 04:52:22 -04001119 umode_t mode;
Eric W. Biederman05cb11c2013-01-31 02:56:19 -08001120 kuid_t uid;
1121 kgid_t gid;
Sage Weila8599bd2009-10-06 11:31:12 -07001122 struct ceph_mds_session *session;
1123 u64 xattr_version = 0;
Sage Weil082afec2010-08-22 15:16:41 -07001124 struct ceph_buffer *xattr_blob = NULL;
Sage Weila8599bd2009-10-06 11:31:12 -07001125 int delayed = 0;
1126 u64 flush_tid = 0;
1127 int i;
1128 int ret;
1129
Sage Weil68c28322010-02-09 13:41:47 -08001130 held = cap->issued | cap->implemented;
1131 revoking = cap->implemented & ~cap->issued;
1132 retain &= ~revoking;
1133 dropping = cap->issued & ~retain;
1134
Sage Weila8599bd2009-10-06 11:31:12 -07001135 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1136 inode, cap, cap->session,
1137 ceph_cap_string(held), ceph_cap_string(held & retain),
1138 ceph_cap_string(revoking));
1139 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1140
1141 session = cap->session;
1142
1143 /* don't release wanted unless we've waited a bit. */
1144 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1145 time_before(jiffies, ci->i_hold_caps_min)) {
1146 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1147 ceph_cap_string(cap->issued),
1148 ceph_cap_string(cap->issued & retain),
1149 ceph_cap_string(cap->mds_wanted),
1150 ceph_cap_string(want));
1151 want |= cap->mds_wanted;
1152 retain |= cap->issued;
1153 delayed = 1;
1154 }
1155 ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
1156
1157 cap->issued &= retain; /* drop bits we don't want */
1158 if (cap->implemented & ~cap->issued) {
1159 /*
1160 * Wake up any waiters on wanted -> needed transition.
1161 * This is due to the weird transition from buffered
1162 * to sync IO... we need to flush dirty pages _before_
1163 * allowing sync writes to avoid reordering.
1164 */
1165 wake = 1;
1166 }
1167 cap->implemented &= cap->issued | used;
1168 cap->mds_wanted = want;
1169
1170 if (flushing) {
1171 /*
1172 * assign a tid for flush operations so we can avoid
1173 * flush1 -> dirty1 -> flush2 -> flushack1 -> mark
1174 * clean type races. track latest tid for every bit
1175 * so we can handle flush AxFw, flush Fw, and have the
1176 * first ack clean Ax.
1177 */
1178 flush_tid = ++ci->i_cap_flush_last_tid;
1179 if (pflush_tid)
1180 *pflush_tid = flush_tid;
1181 dout(" cap_flush_tid %d\n", (int)flush_tid);
1182 for (i = 0; i < CEPH_CAP_BITS; i++)
1183 if (flushing & (1 << i))
1184 ci->i_cap_flush_tid[i] = flush_tid;
Sage Weil7d8cb262010-08-24 08:44:16 -07001185
1186 follows = ci->i_head_snapc->seq;
1187 } else {
1188 follows = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07001189 }
1190
1191 keep = cap->implemented;
1192 seq = cap->seq;
1193 issue_seq = cap->issue_seq;
1194 mseq = cap->mseq;
1195 size = inode->i_size;
1196 ci->i_reported_size = size;
1197 max_size = ci->i_wanted_max_size;
1198 ci->i_requested_max_size = max_size;
1199 mtime = inode->i_mtime;
1200 atime = inode->i_atime;
1201 time_warp_seq = ci->i_time_warp_seq;
Sage Weila8599bd2009-10-06 11:31:12 -07001202 uid = inode->i_uid;
1203 gid = inode->i_gid;
1204 mode = inode->i_mode;
1205
Sage Weil082afec2010-08-22 15:16:41 -07001206 if (flushing & CEPH_CAP_XATTR_EXCL) {
Sage Weila8599bd2009-10-06 11:31:12 -07001207 __ceph_build_xattrs_blob(ci);
Sage Weil082afec2010-08-22 15:16:41 -07001208 xattr_blob = ci->i_xattrs.blob;
1209 xattr_version = ci->i_xattrs.version;
Sage Weila8599bd2009-10-06 11:31:12 -07001210 }
1211
Sage Weilbe655592011-11-30 09:47:09 -08001212 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001213
Sage Weila8599bd2009-10-06 11:31:12 -07001214 ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
1215 op, keep, want, flushing, seq, flush_tid, issue_seq, mseq,
1216 size, max_size, &mtime, &atime, time_warp_seq,
Sage Weil082afec2010-08-22 15:16:41 -07001217 uid, gid, mode, xattr_version, xattr_blob,
Sage Weila8599bd2009-10-06 11:31:12 -07001218 follows);
1219 if (ret < 0) {
1220 dout("error sending cap msg, must requeue %p\n", inode);
1221 delayed = 1;
1222 }
1223
1224 if (wake)
Yehuda Sadeh03066f22010-07-27 13:11:08 -07001225 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07001226
1227 return delayed;
1228}
1229
1230/*
1231 * When a snapshot is taken, clients accumulate dirty metadata on
1232 * inodes with capabilities in ceph_cap_snaps to describe the file
1233 * state at the time the snapshot was taken. This must be flushed
1234 * asynchronously back to the MDS once sync writes complete and dirty
1235 * data is written out.
1236 *
Sage Weile8351242010-09-17 08:03:08 -07001237 * Unless @again is true, skip cap_snaps that were already sent to
1238 * the MDS (i.e., during this session).
1239 *
Sage Weilbe655592011-11-30 09:47:09 -08001240 * Called under i_ceph_lock. Takes s_mutex as needed.
Sage Weila8599bd2009-10-06 11:31:12 -07001241 */
1242void __ceph_flush_snaps(struct ceph_inode_info *ci,
Sage Weile8351242010-09-17 08:03:08 -07001243 struct ceph_mds_session **psession,
1244 int again)
Sage Weilbe655592011-11-30 09:47:09 -08001245 __releases(ci->i_ceph_lock)
1246 __acquires(ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07001247{
1248 struct inode *inode = &ci->vfs_inode;
1249 int mds;
1250 struct ceph_cap_snap *capsnap;
1251 u32 mseq;
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001252 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001253 struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
1254 session->s_mutex */
1255 u64 next_follows = 0; /* keep track of how far we've gotten through the
1256 i_cap_snaps list, and skip these entries next time
1257 around to avoid an infinite loop */
1258
1259 if (psession)
1260 session = *psession;
1261
1262 dout("__flush_snaps %p\n", inode);
1263retry:
1264 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1265 /* avoid an infiniute loop after retry */
1266 if (capsnap->follows < next_follows)
1267 continue;
1268 /*
1269 * we need to wait for sync writes to complete and for dirty
1270 * pages to be written out.
1271 */
1272 if (capsnap->dirty_pages || capsnap->writing)
Sage Weilcfc0bf62010-09-14 15:50:59 -07001273 break;
Sage Weila8599bd2009-10-06 11:31:12 -07001274
Sage Weil819ccbf2010-04-01 09:33:46 -07001275 /*
1276 * if cap writeback already occurred, we should have dropped
1277 * the capsnap in ceph_put_wrbuffer_cap_refs.
1278 */
1279 BUG_ON(capsnap->dirty == 0);
1280
Sage Weila8599bd2009-10-06 11:31:12 -07001281 /* pick mds, take s_mutex */
Sage Weilca81f3f2010-06-10 14:21:36 -07001282 if (ci->i_auth_cap == NULL) {
1283 dout("no auth cap (migrating?), doing nothing\n");
1284 goto out;
1285 }
Sage Weile8351242010-09-17 08:03:08 -07001286
1287 /* only flush each capsnap once */
1288 if (!again && !list_empty(&capsnap->flushing_item)) {
1289 dout("already flushed %p, skipping\n", capsnap);
1290 continue;
1291 }
1292
Sage Weilca81f3f2010-06-10 14:21:36 -07001293 mds = ci->i_auth_cap->session->s_mds;
1294 mseq = ci->i_auth_cap->mseq;
1295
Sage Weila8599bd2009-10-06 11:31:12 -07001296 if (session && session->s_mds != mds) {
1297 dout("oops, wrong session %p mutex\n", session);
1298 mutex_unlock(&session->s_mutex);
1299 ceph_put_mds_session(session);
1300 session = NULL;
1301 }
1302 if (!session) {
Sage Weilbe655592011-11-30 09:47:09 -08001303 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001304 mutex_lock(&mdsc->mutex);
1305 session = __ceph_lookup_mds_session(mdsc, mds);
1306 mutex_unlock(&mdsc->mutex);
1307 if (session) {
1308 dout("inverting session/ino locks on %p\n",
1309 session);
1310 mutex_lock(&session->s_mutex);
1311 }
1312 /*
1313 * if session == NULL, we raced against a cap
Sage Weilca81f3f2010-06-10 14:21:36 -07001314 * deletion or migration. retry, and we'll
1315 * get a better @mds value next time.
Sage Weila8599bd2009-10-06 11:31:12 -07001316 */
Sage Weilbe655592011-11-30 09:47:09 -08001317 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001318 goto retry;
1319 }
1320
1321 capsnap->flush_tid = ++ci->i_cap_flush_last_tid;
1322 atomic_inc(&capsnap->nref);
1323 if (!list_empty(&capsnap->flushing_item))
1324 list_del_init(&capsnap->flushing_item);
1325 list_add_tail(&capsnap->flushing_item,
1326 &session->s_cap_snaps_flushing);
Sage Weilbe655592011-11-30 09:47:09 -08001327 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001328
Sage Weilcfc0bf62010-09-14 15:50:59 -07001329 dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
1330 inode, capsnap, capsnap->follows, capsnap->flush_tid);
Sage Weila8599bd2009-10-06 11:31:12 -07001331 send_cap_msg(session, ceph_vino(inode).ino, 0,
1332 CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
1333 capsnap->dirty, 0, capsnap->flush_tid, 0, mseq,
1334 capsnap->size, 0,
1335 &capsnap->mtime, &capsnap->atime,
1336 capsnap->time_warp_seq,
1337 capsnap->uid, capsnap->gid, capsnap->mode,
Sage Weil4a625be2010-08-22 15:03:56 -07001338 capsnap->xattr_version, capsnap->xattr_blob,
Sage Weila8599bd2009-10-06 11:31:12 -07001339 capsnap->follows);
1340
1341 next_follows = capsnap->follows + 1;
1342 ceph_put_cap_snap(capsnap);
1343
Sage Weilbe655592011-11-30 09:47:09 -08001344 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001345 goto retry;
1346 }
1347
1348 /* we flushed them all; remove this inode from the queue */
1349 spin_lock(&mdsc->snap_flush_lock);
1350 list_del_init(&ci->i_snap_flush_item);
1351 spin_unlock(&mdsc->snap_flush_lock);
1352
Sage Weilca81f3f2010-06-10 14:21:36 -07001353out:
Sage Weila8599bd2009-10-06 11:31:12 -07001354 if (psession)
1355 *psession = session;
1356 else if (session) {
1357 mutex_unlock(&session->s_mutex);
1358 ceph_put_mds_session(session);
1359 }
1360}
1361
1362static void ceph_flush_snaps(struct ceph_inode_info *ci)
1363{
Sage Weilbe655592011-11-30 09:47:09 -08001364 spin_lock(&ci->i_ceph_lock);
Sage Weile8351242010-09-17 08:03:08 -07001365 __ceph_flush_snaps(ci, NULL, 0);
Sage Weilbe655592011-11-30 09:47:09 -08001366 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001367}
1368
1369/*
Sage Weilfca65b42011-05-04 11:33:47 -07001370 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1371 * Caller is then responsible for calling __mark_inode_dirty with the
1372 * returned flags value.
Sage Weil76e3b392009-10-15 18:13:53 -07001373 */
Sage Weilfca65b42011-05-04 11:33:47 -07001374int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask)
Sage Weil76e3b392009-10-15 18:13:53 -07001375{
Cheng Renquan640ef792010-03-26 17:40:33 +08001376 struct ceph_mds_client *mdsc =
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001377 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
Sage Weil76e3b392009-10-15 18:13:53 -07001378 struct inode *inode = &ci->vfs_inode;
1379 int was = ci->i_dirty_caps;
1380 int dirty = 0;
1381
1382 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1383 ceph_cap_string(mask), ceph_cap_string(was),
1384 ceph_cap_string(was | mask));
1385 ci->i_dirty_caps |= mask;
1386 if (was == 0) {
Sage Weil7d8cb262010-08-24 08:44:16 -07001387 if (!ci->i_head_snapc)
1388 ci->i_head_snapc = ceph_get_snap_context(
1389 ci->i_snap_realm->cached_context);
Yan, Zheng06852352012-11-19 10:49:07 +08001390 dout(" inode %p now dirty snapc %p auth cap %p\n",
1391 &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
Yan, Zheng11df2df2013-11-24 14:44:38 +08001392 WARN_ON(!ci->i_auth_cap);
Sage Weil76e3b392009-10-15 18:13:53 -07001393 BUG_ON(!list_empty(&ci->i_dirty_item));
1394 spin_lock(&mdsc->cap_dirty_lock);
Yan, Zheng11df2df2013-11-24 14:44:38 +08001395 list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
Sage Weil76e3b392009-10-15 18:13:53 -07001396 spin_unlock(&mdsc->cap_dirty_lock);
1397 if (ci->i_flushing_caps == 0) {
Sage Weil3772d262011-05-03 09:28:08 -07001398 ihold(inode);
Sage Weil76e3b392009-10-15 18:13:53 -07001399 dirty |= I_DIRTY_SYNC;
1400 }
1401 }
1402 BUG_ON(list_empty(&ci->i_dirty_item));
1403 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1404 (mask & CEPH_CAP_FILE_BUFFER))
1405 dirty |= I_DIRTY_DATASYNC;
Sage Weil76e3b392009-10-15 18:13:53 -07001406 __cap_delay_requeue(mdsc, ci);
Sage Weilfca65b42011-05-04 11:33:47 -07001407 return dirty;
Sage Weil76e3b392009-10-15 18:13:53 -07001408}
1409
1410/*
Sage Weila8599bd2009-10-06 11:31:12 -07001411 * Add dirty inode to the flushing list. Assigned a seq number so we
1412 * can wait for caps to flush without starving.
Sage Weilcdc35f92009-10-14 14:24:19 -07001413 *
Sage Weilbe655592011-11-30 09:47:09 -08001414 * Called under i_ceph_lock.
Sage Weila8599bd2009-10-06 11:31:12 -07001415 */
Sage Weilcdc35f92009-10-14 14:24:19 -07001416static int __mark_caps_flushing(struct inode *inode,
Sage Weila8599bd2009-10-06 11:31:12 -07001417 struct ceph_mds_session *session)
1418{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001419 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001420 struct ceph_inode_info *ci = ceph_inode(inode);
Sage Weilcdc35f92009-10-14 14:24:19 -07001421 int flushing;
Sage Weil50b885b2009-12-01 14:12:07 -08001422
Sage Weilcdc35f92009-10-14 14:24:19 -07001423 BUG_ON(ci->i_dirty_caps == 0);
Sage Weila8599bd2009-10-06 11:31:12 -07001424 BUG_ON(list_empty(&ci->i_dirty_item));
Sage Weilcdc35f92009-10-14 14:24:19 -07001425
1426 flushing = ci->i_dirty_caps;
1427 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1428 ceph_cap_string(flushing),
1429 ceph_cap_string(ci->i_flushing_caps),
1430 ceph_cap_string(ci->i_flushing_caps | flushing));
1431 ci->i_flushing_caps |= flushing;
1432 ci->i_dirty_caps = 0;
Sage Weilafcdaea2009-10-14 14:27:38 -07001433 dout(" inode %p now !dirty\n", inode);
Sage Weilcdc35f92009-10-14 14:24:19 -07001434
Sage Weila8599bd2009-10-06 11:31:12 -07001435 spin_lock(&mdsc->cap_dirty_lock);
Sage Weilafcdaea2009-10-14 14:27:38 -07001436 list_del_init(&ci->i_dirty_item);
1437
1438 ci->i_cap_flush_seq = ++mdsc->cap_flush_seq;
Sage Weila8599bd2009-10-06 11:31:12 -07001439 if (list_empty(&ci->i_flushing_item)) {
1440 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1441 mdsc->num_cap_flushing++;
Sage Weilafcdaea2009-10-14 14:27:38 -07001442 dout(" inode %p now flushing seq %lld\n", inode,
1443 ci->i_cap_flush_seq);
1444 } else {
1445 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1446 dout(" inode %p now flushing (more) seq %lld\n", inode,
Sage Weila8599bd2009-10-06 11:31:12 -07001447 ci->i_cap_flush_seq);
1448 }
1449 spin_unlock(&mdsc->cap_dirty_lock);
Sage Weilcdc35f92009-10-14 14:24:19 -07001450
1451 return flushing;
Sage Weila8599bd2009-10-06 11:31:12 -07001452}
1453
1454/*
Sage Weil5ecad6f2010-02-17 10:43:37 -08001455 * try to invalidate mapping pages without blocking.
1456 */
Sage Weil5ecad6f2010-02-17 10:43:37 -08001457static int try_nonblocking_invalidate(struct inode *inode)
1458{
1459 struct ceph_inode_info *ci = ceph_inode(inode);
1460 u32 invalidating_gen = ci->i_rdcache_gen;
1461
Sage Weilbe655592011-11-30 09:47:09 -08001462 spin_unlock(&ci->i_ceph_lock);
Sage Weil5ecad6f2010-02-17 10:43:37 -08001463 invalidate_mapping_pages(&inode->i_data, 0, -1);
Sage Weilbe655592011-11-30 09:47:09 -08001464 spin_lock(&ci->i_ceph_lock);
Sage Weil5ecad6f2010-02-17 10:43:37 -08001465
Sage Weil18a38192010-09-17 10:46:44 -07001466 if (inode->i_data.nrpages == 0 &&
Sage Weil5ecad6f2010-02-17 10:43:37 -08001467 invalidating_gen == ci->i_rdcache_gen) {
1468 /* success. */
1469 dout("try_nonblocking_invalidate %p success\n", inode);
Sage Weilcd045cb2010-11-04 11:05:05 -07001470 /* save any racing async invalidate some trouble */
1471 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
Sage Weil5ecad6f2010-02-17 10:43:37 -08001472 return 0;
1473 }
1474 dout("try_nonblocking_invalidate %p failed\n", inode);
1475 return -1;
1476}
1477
1478/*
Sage Weila8599bd2009-10-06 11:31:12 -07001479 * Swiss army knife function to examine currently used and wanted
1480 * versus held caps. Release, flush, ack revoked caps to mds as
1481 * appropriate.
1482 *
1483 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1484 * cap release further.
1485 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1486 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1487 * further delay.
1488 */
1489void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1490 struct ceph_mds_session *session)
1491{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001492 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1493 struct ceph_mds_client *mdsc = fsc->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001494 struct inode *inode = &ci->vfs_inode;
1495 struct ceph_cap *cap;
Yan, Zheng395c3122013-01-04 14:37:57 +08001496 int file_wanted, used, cap_used;
Sage Weila8599bd2009-10-06 11:31:12 -07001497 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
Sage Weilcbd03632010-02-09 13:41:18 -08001498 int issued, implemented, want, retain, revoking, flushing = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07001499 int mds = -1; /* keep track of how far we've gone through i_caps list
1500 to avoid an infinite loop on retry */
1501 struct rb_node *p;
1502 int tried_invalidate = 0;
1503 int delayed = 0, sent = 0, force_requeue = 0, num;
Sage Weilcbd03632010-02-09 13:41:18 -08001504 int queue_invalidate = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07001505 int is_delayed = flags & CHECK_CAPS_NODELAY;
1506
1507 /* if we are unmounting, flush any unused caps immediately. */
1508 if (mdsc->stopping)
1509 is_delayed = 1;
1510
Sage Weilbe655592011-11-30 09:47:09 -08001511 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001512
1513 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1514 flags |= CHECK_CAPS_FLUSH;
1515
1516 /* flush snaps first time around only */
1517 if (!list_empty(&ci->i_cap_snaps))
Sage Weile8351242010-09-17 08:03:08 -07001518 __ceph_flush_snaps(ci, &session, 0);
Sage Weila8599bd2009-10-06 11:31:12 -07001519 goto retry_locked;
1520retry:
Sage Weilbe655592011-11-30 09:47:09 -08001521 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001522retry_locked:
1523 file_wanted = __ceph_caps_file_wanted(ci);
1524 used = __ceph_caps_used(ci);
1525 want = file_wanted | used;
Sage Weilcbd03632010-02-09 13:41:18 -08001526 issued = __ceph_caps_issued(ci, &implemented);
1527 revoking = implemented & ~issued;
Sage Weila8599bd2009-10-06 11:31:12 -07001528
1529 retain = want | CEPH_CAP_PIN;
1530 if (!mdsc->stopping && inode->i_nlink > 0) {
1531 if (want) {
1532 retain |= CEPH_CAP_ANY; /* be greedy */
1533 } else {
1534 retain |= CEPH_CAP_ANY_SHARED;
1535 /*
1536 * keep RD only if we didn't have the file open RW,
1537 * because then the mds would revoke it anyway to
1538 * journal max_size=0.
1539 */
1540 if (ci->i_max_size == 0)
1541 retain |= CEPH_CAP_ANY_RD;
1542 }
1543 }
1544
1545 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
Sage Weilcbd03632010-02-09 13:41:18 -08001546 " issued %s revoking %s retain %s %s%s%s\n", inode,
Sage Weila8599bd2009-10-06 11:31:12 -07001547 ceph_cap_string(file_wanted),
1548 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1549 ceph_cap_string(ci->i_flushing_caps),
Sage Weilcbd03632010-02-09 13:41:18 -08001550 ceph_cap_string(issued), ceph_cap_string(revoking),
Sage Weila8599bd2009-10-06 11:31:12 -07001551 ceph_cap_string(retain),
1552 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1553 (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
1554 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1555
1556 /*
1557 * If we no longer need to hold onto old our caps, and we may
1558 * have cached pages, but don't want them, then try to invalidate.
1559 * If we fail, it's because pages are locked.... try again later.
1560 */
1561 if ((!is_delayed || mdsc->stopping) &&
1562 ci->i_wrbuffer_ref == 0 && /* no dirty pages... */
Sage Weil93afd442010-09-17 08:38:25 -07001563 inode->i_data.nrpages && /* have cached pages */
Sage Weilcbd03632010-02-09 13:41:18 -08001564 (file_wanted == 0 || /* no open files */
Sage Weil29625072010-05-27 10:40:43 -07001565 (revoking & (CEPH_CAP_FILE_CACHE|
1566 CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */
Sage Weila8599bd2009-10-06 11:31:12 -07001567 !tried_invalidate) {
Sage Weila8599bd2009-10-06 11:31:12 -07001568 dout("check_caps trying to invalidate on %p\n", inode);
Sage Weil5ecad6f2010-02-17 10:43:37 -08001569 if (try_nonblocking_invalidate(inode) < 0) {
Sage Weil29625072010-05-27 10:40:43 -07001570 if (revoking & (CEPH_CAP_FILE_CACHE|
1571 CEPH_CAP_FILE_LAZYIO)) {
Sage Weil5ecad6f2010-02-17 10:43:37 -08001572 dout("check_caps queuing invalidate\n");
1573 queue_invalidate = 1;
1574 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1575 } else {
1576 dout("check_caps failed to invalidate pages\n");
1577 /* we failed to invalidate pages. check these
1578 caps again later. */
1579 force_requeue = 1;
1580 __cap_set_timeouts(mdsc, ci);
1581 }
Sage Weila8599bd2009-10-06 11:31:12 -07001582 }
1583 tried_invalidate = 1;
1584 goto retry_locked;
1585 }
1586
1587 num = 0;
1588 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1589 cap = rb_entry(p, struct ceph_cap, ci_node);
1590 num++;
1591
1592 /* avoid looping forever */
1593 if (mds >= cap->mds ||
1594 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
1595 continue;
1596
1597 /* NOTE: no side-effects allowed, until we take s_mutex */
1598
Yan, Zheng395c3122013-01-04 14:37:57 +08001599 cap_used = used;
1600 if (ci->i_auth_cap && cap != ci->i_auth_cap)
1601 cap_used &= ~ci->i_auth_cap->issued;
1602
Sage Weila8599bd2009-10-06 11:31:12 -07001603 revoking = cap->implemented & ~cap->issued;
Yan, Zheng395c3122013-01-04 14:37:57 +08001604 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
Sage Weil088b3f52011-01-18 08:56:01 -08001605 cap->mds, cap, ceph_cap_string(cap->issued),
Yan, Zheng395c3122013-01-04 14:37:57 +08001606 ceph_cap_string(cap_used),
Sage Weil088b3f52011-01-18 08:56:01 -08001607 ceph_cap_string(cap->implemented),
1608 ceph_cap_string(revoking));
Sage Weila8599bd2009-10-06 11:31:12 -07001609
1610 if (cap == ci->i_auth_cap &&
1611 (cap->issued & CEPH_CAP_FILE_WR)) {
1612 /* request larger max_size from MDS? */
1613 if (ci->i_wanted_max_size > ci->i_max_size &&
1614 ci->i_wanted_max_size > ci->i_requested_max_size) {
1615 dout("requesting new max_size\n");
1616 goto ack;
1617 }
1618
1619 /* approaching file_max? */
1620 if ((inode->i_size << 1) >= ci->i_max_size &&
1621 (ci->i_reported_size << 1) < ci->i_max_size) {
1622 dout("i_size approaching max_size\n");
1623 goto ack;
1624 }
1625 }
1626 /* flush anything dirty? */
1627 if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
1628 ci->i_dirty_caps) {
1629 dout("flushing dirty caps\n");
1630 goto ack;
1631 }
1632
1633 /* completed revocation? going down and there are no caps? */
Yan, Zheng395c3122013-01-04 14:37:57 +08001634 if (revoking && (revoking & cap_used) == 0) {
Sage Weila8599bd2009-10-06 11:31:12 -07001635 dout("completed revocation of %s\n",
1636 ceph_cap_string(cap->implemented & ~cap->issued));
1637 goto ack;
1638 }
1639
1640 /* want more caps from mds? */
1641 if (want & ~(cap->mds_wanted | cap->issued))
1642 goto ack;
1643
1644 /* things we might delay */
1645 if ((cap->issued & ~retain) == 0 &&
1646 cap->mds_wanted == want)
1647 continue; /* nope, all good */
1648
1649 if (is_delayed)
1650 goto ack;
1651
1652 /* delay? */
1653 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1654 time_before(jiffies, ci->i_hold_caps_max)) {
1655 dout(" delaying issued %s -> %s, wanted %s -> %s\n",
1656 ceph_cap_string(cap->issued),
1657 ceph_cap_string(cap->issued & retain),
1658 ceph_cap_string(cap->mds_wanted),
1659 ceph_cap_string(want));
1660 delayed++;
1661 continue;
1662 }
1663
1664ack:
Sage Weile9964c12010-03-01 15:16:56 -08001665 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1666 dout(" skipping %p I_NOFLUSH set\n", inode);
1667 continue;
1668 }
1669
Sage Weila8599bd2009-10-06 11:31:12 -07001670 if (session && session != cap->session) {
1671 dout("oops, wrong session %p mutex\n", session);
1672 mutex_unlock(&session->s_mutex);
1673 session = NULL;
1674 }
1675 if (!session) {
1676 session = cap->session;
1677 if (mutex_trylock(&session->s_mutex) == 0) {
1678 dout("inverting session/ino locks on %p\n",
1679 session);
Sage Weilbe655592011-11-30 09:47:09 -08001680 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001681 if (took_snap_rwsem) {
1682 up_read(&mdsc->snap_rwsem);
1683 took_snap_rwsem = 0;
1684 }
1685 mutex_lock(&session->s_mutex);
1686 goto retry;
1687 }
1688 }
1689 /* take snap_rwsem after session mutex */
1690 if (!took_snap_rwsem) {
1691 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
1692 dout("inverting snap/in locks on %p\n",
1693 inode);
Sage Weilbe655592011-11-30 09:47:09 -08001694 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001695 down_read(&mdsc->snap_rwsem);
1696 took_snap_rwsem = 1;
1697 goto retry;
1698 }
1699 took_snap_rwsem = 1;
1700 }
1701
Sage Weilcdc35f92009-10-14 14:24:19 -07001702 if (cap == ci->i_auth_cap && ci->i_dirty_caps)
1703 flushing = __mark_caps_flushing(inode, session);
Sage Weil24be0c42011-01-18 08:48:06 -08001704 else
1705 flushing = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07001706
1707 mds = cap->mds; /* remember mds, so we don't repeat */
1708 sent++;
1709
Sage Weilbe655592011-11-30 09:47:09 -08001710 /* __send_cap drops i_ceph_lock */
Yan, Zheng395c3122013-01-04 14:37:57 +08001711 delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, cap_used,
1712 want, retain, flushing, NULL);
Sage Weilbe655592011-11-30 09:47:09 -08001713 goto retry; /* retake i_ceph_lock and restart our cap scan. */
Sage Weila8599bd2009-10-06 11:31:12 -07001714 }
1715
1716 /*
1717 * Reschedule delayed caps release if we delayed anything,
1718 * otherwise cancel.
1719 */
1720 if (delayed && is_delayed)
1721 force_requeue = 1; /* __send_cap delayed release; requeue */
1722 if (!delayed && !is_delayed)
1723 __cap_delay_cancel(mdsc, ci);
1724 else if (!is_delayed || force_requeue)
1725 __cap_delay_requeue(mdsc, ci);
1726
Sage Weilbe655592011-11-30 09:47:09 -08001727 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001728
Sage Weilcbd03632010-02-09 13:41:18 -08001729 if (queue_invalidate)
Sage Weil3c6f6b72010-02-09 15:24:44 -08001730 ceph_queue_invalidate(inode);
Sage Weilcbd03632010-02-09 13:41:18 -08001731
Sage Weilcdc2ce02010-03-16 13:39:28 -07001732 if (session)
Sage Weila8599bd2009-10-06 11:31:12 -07001733 mutex_unlock(&session->s_mutex);
1734 if (took_snap_rwsem)
1735 up_read(&mdsc->snap_rwsem);
1736}
1737
1738/*
Sage Weila8599bd2009-10-06 11:31:12 -07001739 * Try to flush dirty caps back to the auth mds.
1740 */
Yan, Zheng4fe59782013-10-31 16:44:14 +08001741static int try_flush_caps(struct inode *inode, unsigned *flush_tid)
Sage Weila8599bd2009-10-06 11:31:12 -07001742{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001743 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001744 struct ceph_inode_info *ci = ceph_inode(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07001745 int flushing = 0;
Yan, Zheng4fe59782013-10-31 16:44:14 +08001746 struct ceph_mds_session *session = NULL;
Sage Weila8599bd2009-10-06 11:31:12 -07001747
1748retry:
Sage Weilbe655592011-11-30 09:47:09 -08001749 spin_lock(&ci->i_ceph_lock);
Sage Weile9964c12010-03-01 15:16:56 -08001750 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1751 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
1752 goto out;
1753 }
Sage Weila8599bd2009-10-06 11:31:12 -07001754 if (ci->i_dirty_caps && ci->i_auth_cap) {
1755 struct ceph_cap *cap = ci->i_auth_cap;
1756 int used = __ceph_caps_used(ci);
1757 int want = __ceph_caps_wanted(ci);
1758 int delayed;
1759
Yan, Zheng4fe59782013-10-31 16:44:14 +08001760 if (!session || session != cap->session) {
Sage Weilbe655592011-11-30 09:47:09 -08001761 spin_unlock(&ci->i_ceph_lock);
Yan, Zheng4fe59782013-10-31 16:44:14 +08001762 if (session)
1763 mutex_unlock(&session->s_mutex);
Sage Weila8599bd2009-10-06 11:31:12 -07001764 session = cap->session;
1765 mutex_lock(&session->s_mutex);
1766 goto retry;
1767 }
Sage Weila8599bd2009-10-06 11:31:12 -07001768 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
1769 goto out;
1770
Sage Weilcdc35f92009-10-14 14:24:19 -07001771 flushing = __mark_caps_flushing(inode, session);
Sage Weila8599bd2009-10-06 11:31:12 -07001772
Sage Weilbe655592011-11-30 09:47:09 -08001773 /* __send_cap drops i_ceph_lock */
Sage Weila8599bd2009-10-06 11:31:12 -07001774 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
1775 cap->issued | cap->implemented, flushing,
1776 flush_tid);
1777 if (!delayed)
1778 goto out_unlocked;
1779
Sage Weilbe655592011-11-30 09:47:09 -08001780 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001781 __cap_delay_requeue(mdsc, ci);
1782 }
1783out:
Sage Weilbe655592011-11-30 09:47:09 -08001784 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001785out_unlocked:
Yan, Zheng4fe59782013-10-31 16:44:14 +08001786 if (session)
Sage Weila8599bd2009-10-06 11:31:12 -07001787 mutex_unlock(&session->s_mutex);
1788 return flushing;
1789}
1790
1791/*
1792 * Return true if we've flushed caps through the given flush_tid.
1793 */
1794static int caps_are_flushed(struct inode *inode, unsigned tid)
1795{
1796 struct ceph_inode_info *ci = ceph_inode(inode);
Dan Carpentera5ee7512010-05-07 10:27:14 +02001797 int i, ret = 1;
Sage Weila8599bd2009-10-06 11:31:12 -07001798
Sage Weilbe655592011-11-30 09:47:09 -08001799 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001800 for (i = 0; i < CEPH_CAP_BITS; i++)
1801 if ((ci->i_flushing_caps & (1 << i)) &&
1802 ci->i_cap_flush_tid[i] <= tid) {
1803 /* still flushing this bit */
1804 ret = 0;
1805 break;
1806 }
Sage Weilbe655592011-11-30 09:47:09 -08001807 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001808 return ret;
1809}
1810
1811/*
1812 * Wait on any unsafe replies for the given inode. First wait on the
1813 * newest request, and make that the upper bound. Then, if there are
1814 * more requests, keep waiting on the oldest as long as it is still older
1815 * than the original request.
1816 */
1817static void sync_write_wait(struct inode *inode)
1818{
1819 struct ceph_inode_info *ci = ceph_inode(inode);
1820 struct list_head *head = &ci->i_unsafe_writes;
1821 struct ceph_osd_request *req;
1822 u64 last_tid;
1823
1824 spin_lock(&ci->i_unsafe_lock);
1825 if (list_empty(head))
1826 goto out;
1827
1828 /* set upper bound as _last_ entry in chain */
1829 req = list_entry(head->prev, struct ceph_osd_request,
1830 r_unsafe_item);
1831 last_tid = req->r_tid;
1832
1833 do {
1834 ceph_osdc_get_request(req);
1835 spin_unlock(&ci->i_unsafe_lock);
1836 dout("sync_write_wait on tid %llu (until %llu)\n",
1837 req->r_tid, last_tid);
1838 wait_for_completion(&req->r_safe_completion);
1839 spin_lock(&ci->i_unsafe_lock);
1840 ceph_osdc_put_request(req);
1841
1842 /*
1843 * from here on look at first entry in chain, since we
1844 * only want to wait for anything older than last_tid
1845 */
1846 if (list_empty(head))
1847 break;
1848 req = list_entry(head->next, struct ceph_osd_request,
1849 r_unsafe_item);
1850 } while (req->r_tid < last_tid);
1851out:
1852 spin_unlock(&ci->i_unsafe_lock);
1853}
1854
Josef Bacik02c24a82011-07-16 20:44:56 -04001855int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
Sage Weila8599bd2009-10-06 11:31:12 -07001856{
Christoph Hellwig7ea80852010-05-26 17:53:25 +02001857 struct inode *inode = file->f_mapping->host;
Sage Weila8599bd2009-10-06 11:31:12 -07001858 struct ceph_inode_info *ci = ceph_inode(inode);
1859 unsigned flush_tid;
1860 int ret;
1861 int dirty;
1862
1863 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
1864 sync_write_wait(inode);
1865
Josef Bacik02c24a82011-07-16 20:44:56 -04001866 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
Sage Weila8599bd2009-10-06 11:31:12 -07001867 if (ret < 0)
1868 return ret;
Josef Bacik02c24a82011-07-16 20:44:56 -04001869 mutex_lock(&inode->i_mutex);
Sage Weila8599bd2009-10-06 11:31:12 -07001870
Yan, Zheng4fe59782013-10-31 16:44:14 +08001871 dirty = try_flush_caps(inode, &flush_tid);
Sage Weila8599bd2009-10-06 11:31:12 -07001872 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
1873
1874 /*
1875 * only wait on non-file metadata writeback (the mds
1876 * can recover size and mtime, so we don't need to
1877 * wait for that)
1878 */
1879 if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
1880 dout("fsync waiting for flush_tid %u\n", flush_tid);
1881 ret = wait_event_interruptible(ci->i_cap_wq,
1882 caps_are_flushed(inode, flush_tid));
1883 }
1884
1885 dout("fsync %p%s done\n", inode, datasync ? " datasync" : "");
Josef Bacik02c24a82011-07-16 20:44:56 -04001886 mutex_unlock(&inode->i_mutex);
Sage Weila8599bd2009-10-06 11:31:12 -07001887 return ret;
1888}
1889
1890/*
1891 * Flush any dirty caps back to the mds. If we aren't asked to wait,
1892 * queue inode for flush but don't do so immediately, because we can
1893 * get by with fewer MDS messages if we wait for data writeback to
1894 * complete first.
1895 */
Stephen Rothwellf1a3d572010-01-18 11:53:08 +11001896int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
Sage Weila8599bd2009-10-06 11:31:12 -07001897{
1898 struct ceph_inode_info *ci = ceph_inode(inode);
1899 unsigned flush_tid;
1900 int err = 0;
1901 int dirty;
Stephen Rothwellf1a3d572010-01-18 11:53:08 +11001902 int wait = wbc->sync_mode == WB_SYNC_ALL;
Sage Weila8599bd2009-10-06 11:31:12 -07001903
1904 dout("write_inode %p wait=%d\n", inode, wait);
1905 if (wait) {
Yan, Zheng4fe59782013-10-31 16:44:14 +08001906 dirty = try_flush_caps(inode, &flush_tid);
Sage Weila8599bd2009-10-06 11:31:12 -07001907 if (dirty)
1908 err = wait_event_interruptible(ci->i_cap_wq,
1909 caps_are_flushed(inode, flush_tid));
1910 } else {
Cheng Renquan640ef792010-03-26 17:40:33 +08001911 struct ceph_mds_client *mdsc =
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001912 ceph_sb_to_client(inode->i_sb)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07001913
Sage Weilbe655592011-11-30 09:47:09 -08001914 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001915 if (__ceph_caps_dirty(ci))
1916 __cap_delay_requeue_front(mdsc, ci);
Sage Weilbe655592011-11-30 09:47:09 -08001917 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001918 }
1919 return err;
1920}
1921
1922/*
1923 * After a recovering MDS goes active, we need to resend any caps
1924 * we were flushing.
1925 *
1926 * Caller holds session->s_mutex.
1927 */
1928static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc,
1929 struct ceph_mds_session *session)
1930{
1931 struct ceph_cap_snap *capsnap;
1932
1933 dout("kick_flushing_capsnaps mds%d\n", session->s_mds);
1934 list_for_each_entry(capsnap, &session->s_cap_snaps_flushing,
1935 flushing_item) {
1936 struct ceph_inode_info *ci = capsnap->ci;
1937 struct inode *inode = &ci->vfs_inode;
1938 struct ceph_cap *cap;
1939
Sage Weilbe655592011-11-30 09:47:09 -08001940 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001941 cap = ci->i_auth_cap;
1942 if (cap && cap->session == session) {
1943 dout("kick_flushing_caps %p cap %p capsnap %p\n", inode,
1944 cap, capsnap);
Sage Weile8351242010-09-17 08:03:08 -07001945 __ceph_flush_snaps(ci, &session, 1);
Sage Weila8599bd2009-10-06 11:31:12 -07001946 } else {
1947 pr_err("%p auth cap %p not mds%d ???\n", inode,
1948 cap, session->s_mds);
Sage Weila8599bd2009-10-06 11:31:12 -07001949 }
Sage Weilbe655592011-11-30 09:47:09 -08001950 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001951 }
1952}
1953
1954void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
1955 struct ceph_mds_session *session)
1956{
1957 struct ceph_inode_info *ci;
1958
1959 kick_flushing_capsnaps(mdsc, session);
1960
1961 dout("kick_flushing_caps mds%d\n", session->s_mds);
1962 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
1963 struct inode *inode = &ci->vfs_inode;
1964 struct ceph_cap *cap;
1965 int delayed = 0;
1966
Sage Weilbe655592011-11-30 09:47:09 -08001967 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001968 cap = ci->i_auth_cap;
1969 if (cap && cap->session == session) {
1970 dout("kick_flushing_caps %p cap %p %s\n", inode,
1971 cap, ceph_cap_string(ci->i_flushing_caps));
1972 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1973 __ceph_caps_used(ci),
1974 __ceph_caps_wanted(ci),
1975 cap->issued | cap->implemented,
1976 ci->i_flushing_caps, NULL);
1977 if (delayed) {
Sage Weilbe655592011-11-30 09:47:09 -08001978 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001979 __cap_delay_requeue(mdsc, ci);
Sage Weilbe655592011-11-30 09:47:09 -08001980 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001981 }
1982 } else {
1983 pr_err("%p auth cap %p not mds%d ???\n", inode,
1984 cap, session->s_mds);
Sage Weilbe655592011-11-30 09:47:09 -08001985 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07001986 }
1987 }
1988}
1989
Sage Weil088b3f52011-01-18 08:56:01 -08001990static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
1991 struct ceph_mds_session *session,
1992 struct inode *inode)
1993{
1994 struct ceph_inode_info *ci = ceph_inode(inode);
1995 struct ceph_cap *cap;
1996 int delayed = 0;
1997
Sage Weilbe655592011-11-30 09:47:09 -08001998 spin_lock(&ci->i_ceph_lock);
Sage Weil088b3f52011-01-18 08:56:01 -08001999 cap = ci->i_auth_cap;
2000 dout("kick_flushing_inode_caps %p flushing %s flush_seq %lld\n", inode,
2001 ceph_cap_string(ci->i_flushing_caps), ci->i_cap_flush_seq);
Yan, Zheng005c4692013-05-31 16:40:24 +08002002
Sage Weil088b3f52011-01-18 08:56:01 -08002003 __ceph_flush_snaps(ci, &session, 1);
Yan, Zheng005c4692013-05-31 16:40:24 +08002004
Sage Weil088b3f52011-01-18 08:56:01 -08002005 if (ci->i_flushing_caps) {
Yan, Zheng005c4692013-05-31 16:40:24 +08002006 spin_lock(&mdsc->cap_dirty_lock);
2007 list_move_tail(&ci->i_flushing_item,
2008 &cap->session->s_cap_flushing);
2009 spin_unlock(&mdsc->cap_dirty_lock);
2010
Sage Weil088b3f52011-01-18 08:56:01 -08002011 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
2012 __ceph_caps_used(ci),
2013 __ceph_caps_wanted(ci),
2014 cap->issued | cap->implemented,
2015 ci->i_flushing_caps, NULL);
2016 if (delayed) {
Sage Weilbe655592011-11-30 09:47:09 -08002017 spin_lock(&ci->i_ceph_lock);
Sage Weil088b3f52011-01-18 08:56:01 -08002018 __cap_delay_requeue(mdsc, ci);
Sage Weilbe655592011-11-30 09:47:09 -08002019 spin_unlock(&ci->i_ceph_lock);
Sage Weil088b3f52011-01-18 08:56:01 -08002020 }
2021 } else {
Sage Weilbe655592011-11-30 09:47:09 -08002022 spin_unlock(&ci->i_ceph_lock);
Sage Weil088b3f52011-01-18 08:56:01 -08002023 }
2024}
2025
Sage Weila8599bd2009-10-06 11:31:12 -07002026
2027/*
2028 * Take references to capabilities we hold, so that we don't release
2029 * them to the MDS prematurely.
2030 *
Sage Weilbe655592011-11-30 09:47:09 -08002031 * Protected by i_ceph_lock.
Sage Weila8599bd2009-10-06 11:31:12 -07002032 */
2033static void __take_cap_refs(struct ceph_inode_info *ci, int got)
2034{
2035 if (got & CEPH_CAP_PIN)
2036 ci->i_pin_ref++;
2037 if (got & CEPH_CAP_FILE_RD)
2038 ci->i_rd_ref++;
2039 if (got & CEPH_CAP_FILE_CACHE)
2040 ci->i_rdcache_ref++;
2041 if (got & CEPH_CAP_FILE_WR)
2042 ci->i_wr_ref++;
2043 if (got & CEPH_CAP_FILE_BUFFER) {
Henry C Changd3d07202011-05-11 10:29:54 +00002044 if (ci->i_wb_ref == 0)
Sage Weil3772d262011-05-03 09:28:08 -07002045 ihold(&ci->vfs_inode);
Henry C Changd3d07202011-05-11 10:29:54 +00002046 ci->i_wb_ref++;
2047 dout("__take_cap_refs %p wb %d -> %d (?)\n",
2048 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
Sage Weila8599bd2009-10-06 11:31:12 -07002049 }
2050}
2051
2052/*
2053 * Try to grab cap references. Specify those refs we @want, and the
2054 * minimal set we @need. Also include the larger offset we are writing
2055 * to (when applicable), and check against max_size here as well.
2056 * Note that caller is responsible for ensuring max_size increases are
2057 * requested from the MDS.
2058 */
2059static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
2060 int *got, loff_t endoff, int *check_max, int *err)
2061{
2062 struct inode *inode = &ci->vfs_inode;
2063 int ret = 0;
2064 int have, implemented;
Sage Weil195d3ce2010-03-01 09:57:54 -08002065 int file_wanted;
Sage Weila8599bd2009-10-06 11:31:12 -07002066
2067 dout("get_cap_refs %p need %s want %s\n", inode,
2068 ceph_cap_string(need), ceph_cap_string(want));
Sage Weilbe655592011-11-30 09:47:09 -08002069 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002070
Sage Weil195d3ce2010-03-01 09:57:54 -08002071 /* make sure file is actually open */
2072 file_wanted = __ceph_caps_file_wanted(ci);
2073 if ((file_wanted & need) == 0) {
2074 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
2075 ceph_cap_string(need), ceph_cap_string(file_wanted));
Sage Weila8599bd2009-10-06 11:31:12 -07002076 *err = -EBADF;
2077 ret = 1;
2078 goto out;
2079 }
2080
Yan, Zheng37505d52013-04-12 16:11:10 +08002081 /* finish pending truncate */
2082 while (ci->i_truncate_pending) {
2083 spin_unlock(&ci->i_ceph_lock);
Yan, Zhengb415bf42013-07-02 12:40:19 +08002084 __ceph_do_pending_vmtruncate(inode);
Yan, Zheng37505d52013-04-12 16:11:10 +08002085 spin_lock(&ci->i_ceph_lock);
2086 }
2087
Yan, Zheng3871cbb2013-08-05 14:10:29 +08002088 have = __ceph_caps_issued(ci, &implemented);
2089
2090 if (have & need & CEPH_CAP_FILE_WR) {
Sage Weila8599bd2009-10-06 11:31:12 -07002091 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2092 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2093 inode, endoff, ci->i_max_size);
Yan, Zheng3871cbb2013-08-05 14:10:29 +08002094 if (endoff > ci->i_requested_max_size) {
Sage Weila8599bd2009-10-06 11:31:12 -07002095 *check_max = 1;
2096 ret = 1;
2097 }
2098 goto out;
2099 }
2100 /*
2101 * If a sync write is in progress, we must wait, so that we
2102 * can get a final snapshot value for size+mtime.
2103 */
2104 if (__ceph_have_pending_cap_snap(ci)) {
2105 dout("get_cap_refs %p cap_snap_pending\n", inode);
2106 goto out;
2107 }
2108 }
Sage Weila8599bd2009-10-06 11:31:12 -07002109
Sage Weila8599bd2009-10-06 11:31:12 -07002110 if ((have & need) == need) {
2111 /*
2112 * Look at (implemented & ~have & not) so that we keep waiting
2113 * on transition from wanted -> needed caps. This is needed
2114 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2115 * going before a prior buffered writeback happens.
2116 */
2117 int not = want & ~(have & need);
2118 int revoking = implemented & ~have;
2119 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2120 inode, ceph_cap_string(have), ceph_cap_string(not),
2121 ceph_cap_string(revoking));
2122 if ((revoking & not) == 0) {
2123 *got = need | (have & want);
2124 __take_cap_refs(ci, *got);
2125 ret = 1;
2126 }
2127 } else {
2128 dout("get_cap_refs %p have %s needed %s\n", inode,
2129 ceph_cap_string(have), ceph_cap_string(need));
2130 }
2131out:
Sage Weilbe655592011-11-30 09:47:09 -08002132 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002133 dout("get_cap_refs %p ret %d got %s\n", inode,
2134 ret, ceph_cap_string(*got));
2135 return ret;
2136}
2137
2138/*
2139 * Check the offset we are writing up to against our current
2140 * max_size. If necessary, tell the MDS we want to write to
2141 * a larger offset.
2142 */
2143static void check_max_size(struct inode *inode, loff_t endoff)
2144{
2145 struct ceph_inode_info *ci = ceph_inode(inode);
2146 int check = 0;
2147
2148 /* do we need to explicitly request a larger max_size? */
Sage Weilbe655592011-11-30 09:47:09 -08002149 spin_lock(&ci->i_ceph_lock);
Yan, Zheng3871cbb2013-08-05 14:10:29 +08002150 if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
Sage Weila8599bd2009-10-06 11:31:12 -07002151 dout("write %p at large endoff %llu, req max_size\n",
2152 inode, endoff);
2153 ci->i_wanted_max_size = endoff;
Sage Weila8599bd2009-10-06 11:31:12 -07002154 }
Yan, Zheng3871cbb2013-08-05 14:10:29 +08002155 /* duplicate ceph_check_caps()'s logic */
2156 if (ci->i_auth_cap &&
2157 (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
2158 ci->i_wanted_max_size > ci->i_max_size &&
2159 ci->i_wanted_max_size > ci->i_requested_max_size)
2160 check = 1;
Sage Weilbe655592011-11-30 09:47:09 -08002161 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002162 if (check)
2163 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2164}
2165
2166/*
2167 * Wait for caps, and take cap references. If we can't get a WR cap
2168 * due to a small max_size, make sure we check_max_size (and possibly
2169 * ask the mds) so we don't get hung up indefinitely.
2170 */
2171int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got,
2172 loff_t endoff)
2173{
2174 int check_max, ret, err;
2175
2176retry:
2177 if (endoff > 0)
2178 check_max_size(&ci->vfs_inode, endoff);
2179 check_max = 0;
2180 err = 0;
2181 ret = wait_event_interruptible(ci->i_cap_wq,
2182 try_get_cap_refs(ci, need, want,
2183 got, endoff,
2184 &check_max, &err));
2185 if (err)
2186 ret = err;
2187 if (check_max)
2188 goto retry;
2189 return ret;
2190}
2191
2192/*
2193 * Take cap refs. Caller must already know we hold at least one ref
2194 * on the caps in question or we don't know this is safe.
2195 */
2196void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2197{
Sage Weilbe655592011-11-30 09:47:09 -08002198 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002199 __take_cap_refs(ci, caps);
Sage Weilbe655592011-11-30 09:47:09 -08002200 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002201}
2202
2203/*
2204 * Release cap refs.
2205 *
2206 * If we released the last ref on any given cap, call ceph_check_caps
2207 * to release (or schedule a release).
2208 *
2209 * If we are releasing a WR cap (from a sync write), finalize any affected
2210 * cap_snap, and wake up any waiters.
2211 */
2212void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
2213{
2214 struct inode *inode = &ci->vfs_inode;
2215 int last = 0, put = 0, flushsnaps = 0, wake = 0;
2216 struct ceph_cap_snap *capsnap;
2217
Sage Weilbe655592011-11-30 09:47:09 -08002218 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002219 if (had & CEPH_CAP_PIN)
2220 --ci->i_pin_ref;
2221 if (had & CEPH_CAP_FILE_RD)
2222 if (--ci->i_rd_ref == 0)
2223 last++;
2224 if (had & CEPH_CAP_FILE_CACHE)
2225 if (--ci->i_rdcache_ref == 0)
2226 last++;
2227 if (had & CEPH_CAP_FILE_BUFFER) {
Henry C Changd3d07202011-05-11 10:29:54 +00002228 if (--ci->i_wb_ref == 0) {
Sage Weila8599bd2009-10-06 11:31:12 -07002229 last++;
2230 put++;
2231 }
Henry C Changd3d07202011-05-11 10:29:54 +00002232 dout("put_cap_refs %p wb %d -> %d (?)\n",
2233 inode, ci->i_wb_ref+1, ci->i_wb_ref);
Sage Weila8599bd2009-10-06 11:31:12 -07002234 }
2235 if (had & CEPH_CAP_FILE_WR)
2236 if (--ci->i_wr_ref == 0) {
2237 last++;
2238 if (!list_empty(&ci->i_cap_snaps)) {
2239 capsnap = list_first_entry(&ci->i_cap_snaps,
2240 struct ceph_cap_snap,
2241 ci_item);
2242 if (capsnap->writing) {
2243 capsnap->writing = 0;
2244 flushsnaps =
2245 __ceph_finish_cap_snap(ci,
2246 capsnap);
2247 wake = 1;
2248 }
2249 }
2250 }
Sage Weilbe655592011-11-30 09:47:09 -08002251 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002252
Sage Weil819ccbf2010-04-01 09:33:46 -07002253 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
2254 last ? " last" : "", put ? " put" : "");
Sage Weila8599bd2009-10-06 11:31:12 -07002255
2256 if (last && !flushsnaps)
2257 ceph_check_caps(ci, 0, NULL);
2258 else if (flushsnaps)
2259 ceph_flush_snaps(ci);
2260 if (wake)
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002261 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07002262 if (put)
2263 iput(inode);
2264}
2265
2266/*
2267 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2268 * context. Adjust per-snap dirty page accounting as appropriate.
2269 * Once all dirty data for a cap_snap is flushed, flush snapped file
2270 * metadata back to the MDS. If we dropped the last ref, call
2271 * ceph_check_caps.
2272 */
2273void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
2274 struct ceph_snap_context *snapc)
2275{
2276 struct inode *inode = &ci->vfs_inode;
2277 int last = 0;
Sage Weil819ccbf2010-04-01 09:33:46 -07002278 int complete_capsnap = 0;
2279 int drop_capsnap = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07002280 int found = 0;
2281 struct ceph_cap_snap *capsnap = NULL;
2282
Sage Weilbe655592011-11-30 09:47:09 -08002283 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002284 ci->i_wrbuffer_ref -= nr;
2285 last = !ci->i_wrbuffer_ref;
2286
2287 if (ci->i_head_snapc == snapc) {
2288 ci->i_wrbuffer_ref_head -= nr;
Sage Weil7d8cb262010-08-24 08:44:16 -07002289 if (ci->i_wrbuffer_ref_head == 0 &&
2290 ci->i_dirty_caps == 0 && ci->i_flushing_caps == 0) {
2291 BUG_ON(!ci->i_head_snapc);
Sage Weila8599bd2009-10-06 11:31:12 -07002292 ceph_put_snap_context(ci->i_head_snapc);
2293 ci->i_head_snapc = NULL;
2294 }
2295 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2296 inode,
2297 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
2298 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
2299 last ? " LAST" : "");
2300 } else {
2301 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2302 if (capsnap->context == snapc) {
2303 found = 1;
Sage Weila8599bd2009-10-06 11:31:12 -07002304 break;
2305 }
2306 }
2307 BUG_ON(!found);
Sage Weil819ccbf2010-04-01 09:33:46 -07002308 capsnap->dirty_pages -= nr;
2309 if (capsnap->dirty_pages == 0) {
2310 complete_capsnap = 1;
2311 if (capsnap->dirty == 0)
2312 /* cap writeback completed before we created
2313 * the cap_snap; no FLUSHSNAP is needed */
2314 drop_capsnap = 1;
2315 }
Sage Weila8599bd2009-10-06 11:31:12 -07002316 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
Sage Weil819ccbf2010-04-01 09:33:46 -07002317 " snap %lld %d/%d -> %d/%d %s%s%s\n",
Sage Weila8599bd2009-10-06 11:31:12 -07002318 inode, capsnap, capsnap->context->seq,
2319 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
2320 ci->i_wrbuffer_ref, capsnap->dirty_pages,
2321 last ? " (wrbuffer last)" : "",
Sage Weil819ccbf2010-04-01 09:33:46 -07002322 complete_capsnap ? " (complete capsnap)" : "",
2323 drop_capsnap ? " (drop capsnap)" : "");
2324 if (drop_capsnap) {
2325 ceph_put_snap_context(capsnap->context);
2326 list_del(&capsnap->ci_item);
2327 list_del(&capsnap->flushing_item);
2328 ceph_put_cap_snap(capsnap);
2329 }
Sage Weila8599bd2009-10-06 11:31:12 -07002330 }
2331
Sage Weilbe655592011-11-30 09:47:09 -08002332 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002333
2334 if (last) {
2335 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2336 iput(inode);
Sage Weil819ccbf2010-04-01 09:33:46 -07002337 } else if (complete_capsnap) {
Sage Weila8599bd2009-10-06 11:31:12 -07002338 ceph_flush_snaps(ci);
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002339 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07002340 }
Sage Weil819ccbf2010-04-01 09:33:46 -07002341 if (drop_capsnap)
2342 iput(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07002343}
2344
2345/*
Yan, Zhengca20c992013-07-21 10:07:51 +08002346 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
2347 */
2348static void invalidate_aliases(struct inode *inode)
2349{
2350 struct dentry *dn, *prev = NULL;
2351
2352 dout("invalidate_aliases inode %p\n", inode);
2353 d_prune_aliases(inode);
2354 /*
2355 * For non-directory inode, d_find_alias() only returns
J. Bruce Fieldsfc12c802014-01-16 17:42:53 -05002356 * hashed dentry. After calling d_invalidate(), the
2357 * dentry becomes unhashed.
Yan, Zhengca20c992013-07-21 10:07:51 +08002358 *
Yan, Zhenga8d436f2013-09-02 15:19:54 +08002359 * For directory inode, d_find_alias() can return
J. Bruce Fieldsfc12c802014-01-16 17:42:53 -05002360 * unhashed dentry. But directory inode should have
Yan, Zhengca20c992013-07-21 10:07:51 +08002361 * one alias at most.
2362 */
2363 while ((dn = d_find_alias(inode))) {
2364 if (dn == prev) {
2365 dput(dn);
2366 break;
2367 }
Yan, Zhenga8d436f2013-09-02 15:19:54 +08002368 d_invalidate(dn);
Yan, Zhengca20c992013-07-21 10:07:51 +08002369 if (prev)
2370 dput(prev);
2371 prev = dn;
2372 }
2373 if (prev)
2374 dput(prev);
2375}
2376
2377/*
Sage Weila8599bd2009-10-06 11:31:12 -07002378 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
2379 * actually be a revocation if it specifies a smaller cap set.)
2380 *
Sage Weilbe655592011-11-30 09:47:09 -08002381 * caller holds s_mutex and i_ceph_lock, we drop both.
Sage Weila8599bd2009-10-06 11:31:12 -07002382 */
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002383static void handle_cap_grant(struct ceph_mds_client *mdsc,
2384 struct inode *inode, struct ceph_mds_caps *grant,
2385 void *snaptrace, int snaptrace_len,
2386 struct ceph_buffer *xattr_buf,
Sage Weil15637c82010-03-16 13:42:00 -07002387 struct ceph_mds_session *session,
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002388 struct ceph_cap *cap, int issued)
2389 __releases(ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07002390{
2391 struct ceph_inode_info *ci = ceph_inode(inode);
2392 int mds = session->s_mds;
Sage Weil2f56f562010-10-27 20:59:49 -07002393 int seq = le32_to_cpu(grant->seq);
Sage Weila8599bd2009-10-06 11:31:12 -07002394 int newcaps = le32_to_cpu(grant->caps);
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002395 int used, wanted, dirty;
Sage Weila8599bd2009-10-06 11:31:12 -07002396 u64 size = le64_to_cpu(grant->size);
2397 u64 max_size = le64_to_cpu(grant->max_size);
2398 struct timespec mtime, atime, ctime;
Sage Weil15637c82010-03-16 13:42:00 -07002399 int check_caps = 0;
Fabian Frederickab6c2c32014-10-09 23:16:35 +02002400 bool wake = false;
2401 bool writeback = false;
2402 bool queue_trunc = false;
2403 bool queue_invalidate = false;
2404 bool queue_revalidate = false;
2405 bool deleted_inode = false;
Sage Weila8599bd2009-10-06 11:31:12 -07002406
Sage Weil2f56f562010-10-27 20:59:49 -07002407 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
2408 inode, cap, mds, seq, ceph_cap_string(newcaps));
Sage Weila8599bd2009-10-06 11:31:12 -07002409 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
2410 inode->i_size);
2411
Yan, Zheng11df2df2013-11-24 14:44:38 +08002412
2413 /*
2414 * auth mds of the inode changed. we received the cap export message,
2415 * but still haven't received the cap import message. handle_cap_export
2416 * updated the new auth MDS' cap.
2417 *
2418 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
2419 * that was sent before the cap import message. So don't remove caps.
2420 */
2421 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
2422 WARN_ON(cap != ci->i_auth_cap);
2423 WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id));
2424 seq = cap->seq;
2425 newcaps |= cap->issued;
2426 }
2427
Sage Weila8599bd2009-10-06 11:31:12 -07002428 /*
2429 * If CACHE is being revoked, and we have no dirty buffers,
2430 * try to invalidate (once). (If there are dirty buffers, we
2431 * will invalidate _after_ writeback.)
2432 */
Sage Weil3b454c42010-06-10 13:20:33 -07002433 if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
2434 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
Yehuda Sadehbcd2cbd2010-02-19 00:12:21 +00002435 !ci->i_wrbuffer_ref) {
Li Wange9075742013-08-15 22:00:25 -07002436 if (try_nonblocking_invalidate(inode)) {
Sage Weila8599bd2009-10-06 11:31:12 -07002437 /* there were locked pages.. invalidate later
2438 in a separate thread. */
2439 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
Fabian Frederickab6c2c32014-10-09 23:16:35 +02002440 queue_invalidate = true;
Sage Weila8599bd2009-10-06 11:31:12 -07002441 ci->i_rdcache_revoking = ci->i_rdcache_gen;
2442 }
Sage Weila8599bd2009-10-06 11:31:12 -07002443 }
Milosz Tanski99ccbd22013-08-21 17:29:54 -04002444
2445 ceph_fscache_invalidate(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07002446 }
2447
2448 /* side effects now are allowed */
Sage Weil685f9a5d2009-11-09 12:05:48 -08002449 cap->cap_gen = session->s_cap_gen;
Yan, Zheng11df2df2013-11-24 14:44:38 +08002450 cap->seq = seq;
Sage Weila8599bd2009-10-06 11:31:12 -07002451
2452 __check_cap_issue(ci, cap, newcaps);
2453
Yan, Zhengf98a1282014-04-17 08:55:50 +08002454 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
2455 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
Sage Weila8599bd2009-10-06 11:31:12 -07002456 inode->i_mode = le32_to_cpu(grant->mode);
Eric W. Biederman05cb11c2013-01-31 02:56:19 -08002457 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
2458 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
Sage Weila8599bd2009-10-06 11:31:12 -07002459 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
Eric W. Biedermanbd2bae62013-01-31 04:05:39 -08002460 from_kuid(&init_user_ns, inode->i_uid),
2461 from_kgid(&init_user_ns, inode->i_gid));
Sage Weila8599bd2009-10-06 11:31:12 -07002462 }
2463
Yan, Zhengf98a1282014-04-17 08:55:50 +08002464 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
2465 (issued & CEPH_CAP_LINK_EXCL) == 0) {
Miklos Szeredibfe86842011-10-28 14:13:29 +02002466 set_nlink(inode, le32_to_cpu(grant->nlink));
Yan, Zhengca20c992013-07-21 10:07:51 +08002467 if (inode->i_nlink == 0 &&
2468 (newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL)))
Fabian Frederickab6c2c32014-10-09 23:16:35 +02002469 deleted_inode = true;
Yan, Zhengca20c992013-07-21 10:07:51 +08002470 }
Sage Weila8599bd2009-10-06 11:31:12 -07002471
2472 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
2473 int len = le32_to_cpu(grant->xattr_len);
2474 u64 version = le64_to_cpu(grant->xattr_version);
2475
2476 if (version > ci->i_xattrs.version) {
2477 dout(" got new xattrs v%llu on %p len %d\n",
2478 version, inode, len);
2479 if (ci->i_xattrs.blob)
2480 ceph_buffer_put(ci->i_xattrs.blob);
2481 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
2482 ci->i_xattrs.version = version;
Guangliang Zhao7221fe42013-11-11 15:18:03 +08002483 ceph_forget_all_cached_acls(inode);
Sage Weila8599bd2009-10-06 11:31:12 -07002484 }
2485 }
2486
Milosz Tanski99ccbd22013-08-21 17:29:54 -04002487 /* Do we need to revalidate our fscache cookie. Don't bother on the
2488 * first cache cap as we already validate at cookie creation time. */
2489 if ((issued & CEPH_CAP_FILE_CACHE) && ci->i_rdcache_gen > 1)
Fabian Frederickab6c2c32014-10-09 23:16:35 +02002490 queue_revalidate = true;
Milosz Tanski99ccbd22013-08-21 17:29:54 -04002491
Yan, Zhengf98a1282014-04-17 08:55:50 +08002492 if (newcaps & CEPH_CAP_ANY_RD) {
2493 /* ctime/mtime/atime? */
2494 ceph_decode_timespec(&mtime, &grant->mtime);
2495 ceph_decode_timespec(&atime, &grant->atime);
2496 ceph_decode_timespec(&ctime, &grant->ctime);
2497 ceph_fill_file_time(inode, issued,
2498 le32_to_cpu(grant->time_warp_seq),
2499 &ctime, &mtime, &atime);
2500 }
Sage Weila8599bd2009-10-06 11:31:12 -07002501
Yan, Zhengf98a1282014-04-17 08:55:50 +08002502 if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) {
2503 /* file layout may have changed */
2504 ci->i_layout = grant->layout;
2505 /* size/truncate_seq? */
2506 queue_trunc = ceph_fill_file_size(inode, issued,
2507 le32_to_cpu(grant->truncate_seq),
2508 le64_to_cpu(grant->truncate_size),
2509 size);
2510 /* max size increase? */
2511 if (ci->i_auth_cap == cap && max_size != ci->i_max_size) {
2512 dout("max_size %lld -> %llu\n",
2513 ci->i_max_size, max_size);
2514 ci->i_max_size = max_size;
2515 if (max_size >= ci->i_wanted_max_size) {
2516 ci->i_wanted_max_size = 0; /* reset */
2517 ci->i_requested_max_size = 0;
2518 }
Fabian Frederickab6c2c32014-10-09 23:16:35 +02002519 wake = true;
Sage Weila8599bd2009-10-06 11:31:12 -07002520 }
Sage Weila8599bd2009-10-06 11:31:12 -07002521 }
2522
2523 /* check cap bits */
2524 wanted = __ceph_caps_wanted(ci);
2525 used = __ceph_caps_used(ci);
2526 dirty = __ceph_caps_dirty(ci);
2527 dout(" my wanted = %s, used = %s, dirty %s\n",
2528 ceph_cap_string(wanted),
2529 ceph_cap_string(used),
2530 ceph_cap_string(dirty));
2531 if (wanted != le32_to_cpu(grant->wanted)) {
2532 dout("mds wanted %s -> %s\n",
2533 ceph_cap_string(le32_to_cpu(grant->wanted)),
2534 ceph_cap_string(wanted));
Yan, Zheng390306c2013-01-04 15:30:10 +08002535 /* imported cap may not have correct mds_wanted */
2536 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT)
2537 check_caps = 1;
Sage Weila8599bd2009-10-06 11:31:12 -07002538 }
2539
Sage Weila8599bd2009-10-06 11:31:12 -07002540 /* revocation, grant, or no-op? */
2541 if (cap->issued & ~newcaps) {
Sage Weil3b454c42010-06-10 13:20:33 -07002542 int revoking = cap->issued & ~newcaps;
2543
2544 dout("revocation: %s -> %s (revoking %s)\n",
2545 ceph_cap_string(cap->issued),
2546 ceph_cap_string(newcaps),
2547 ceph_cap_string(revoking));
Sage Weil0eb6cd42010-08-05 13:53:18 -07002548 if (revoking & used & CEPH_CAP_FILE_BUFFER)
Fabian Frederickab6c2c32014-10-09 23:16:35 +02002549 writeback = true; /* initiate writeback; will delay ack */
Sage Weil3b454c42010-06-10 13:20:33 -07002550 else if (revoking == CEPH_CAP_FILE_CACHE &&
2551 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2552 queue_invalidate)
2553 ; /* do nothing yet, invalidation will be queued */
2554 else if (cap == ci->i_auth_cap)
2555 check_caps = 1; /* check auth cap only */
2556 else
2557 check_caps = 2; /* check all caps */
Sage Weila8599bd2009-10-06 11:31:12 -07002558 cap->issued = newcaps;
Sage Weil978097c2010-03-08 15:27:53 -08002559 cap->implemented |= newcaps;
Sage Weila8599bd2009-10-06 11:31:12 -07002560 } else if (cap->issued == newcaps) {
2561 dout("caps unchanged: %s -> %s\n",
2562 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
2563 } else {
2564 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
2565 ceph_cap_string(newcaps));
Yan, Zheng6ee6b9532013-07-02 12:40:21 +08002566 /* non-auth MDS is revoking the newly grant caps ? */
2567 if (cap == ci->i_auth_cap &&
2568 __ceph_caps_revoking_other(ci, cap, newcaps))
2569 check_caps = 2;
2570
Sage Weila8599bd2009-10-06 11:31:12 -07002571 cap->issued = newcaps;
2572 cap->implemented |= newcaps; /* add bits only, to
2573 * avoid stepping on a
2574 * pending revocation */
Fabian Frederickab6c2c32014-10-09 23:16:35 +02002575 wake = true;
Sage Weila8599bd2009-10-06 11:31:12 -07002576 }
Sage Weil978097c2010-03-08 15:27:53 -08002577 BUG_ON(cap->issued & ~cap->implemented);
Sage Weila8599bd2009-10-06 11:31:12 -07002578
Sage Weilbe655592011-11-30 09:47:09 -08002579 spin_unlock(&ci->i_ceph_lock);
Milosz Tanski99ccbd22013-08-21 17:29:54 -04002580
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002581 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) {
2582 down_write(&mdsc->snap_rwsem);
2583 ceph_update_snap_trace(mdsc, snaptrace,
2584 snaptrace + snaptrace_len, false);
2585 downgrade_write(&mdsc->snap_rwsem);
2586 kick_flushing_inode_caps(mdsc, session, inode);
2587 up_read(&mdsc->snap_rwsem);
2588 if (newcaps & ~issued)
Fabian Frederickab6c2c32014-10-09 23:16:35 +02002589 wake = true;
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002590 }
2591
Yan, Zhengc6bcda62014-04-11 10:18:07 +08002592 if (queue_trunc) {
2593 ceph_queue_vmtruncate(inode);
2594 ceph_queue_revalidate(inode);
2595 } else if (queue_revalidate)
2596 ceph_queue_revalidate(inode);
2597
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);
Sage Weila8599bd2009-10-06 11:31:12 -07002609 if (wake)
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002610 wake_up_all(&ci->i_cap_wq);
Sage Weil15637c82010-03-16 13:42:00 -07002611
2612 if (check_caps == 1)
2613 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
2614 session);
2615 else if (check_caps == 2)
2616 ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
2617 else
2618 mutex_unlock(&session->s_mutex);
Sage Weila8599bd2009-10-06 11:31:12 -07002619}
2620
2621/*
2622 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
2623 * MDS has been safely committed.
2624 */
Sage Weil6df058c2009-12-22 11:24:33 -08002625static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
Sage Weila8599bd2009-10-06 11:31:12 -07002626 struct ceph_mds_caps *m,
2627 struct ceph_mds_session *session,
2628 struct ceph_cap *cap)
Sage Weilbe655592011-11-30 09:47:09 -08002629 __releases(ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07002630{
2631 struct ceph_inode_info *ci = ceph_inode(inode);
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002632 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
Sage Weila8599bd2009-10-06 11:31:12 -07002633 unsigned seq = le32_to_cpu(m->seq);
2634 int dirty = le32_to_cpu(m->dirty);
2635 int cleaned = 0;
Sage Weilafcdaea2009-10-14 14:27:38 -07002636 int drop = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07002637 int i;
2638
2639 for (i = 0; i < CEPH_CAP_BITS; i++)
2640 if ((dirty & (1 << i)) &&
2641 flush_tid == ci->i_cap_flush_tid[i])
2642 cleaned |= 1 << i;
2643
2644 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
2645 " flushing %s -> %s\n",
2646 inode, session->s_mds, seq, ceph_cap_string(dirty),
2647 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
2648 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
2649
2650 if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned))
2651 goto out;
2652
Sage Weila8599bd2009-10-06 11:31:12 -07002653 ci->i_flushing_caps &= ~cleaned;
Sage Weila8599bd2009-10-06 11:31:12 -07002654
2655 spin_lock(&mdsc->cap_dirty_lock);
2656 if (ci->i_flushing_caps == 0) {
2657 list_del_init(&ci->i_flushing_item);
2658 if (!list_empty(&session->s_cap_flushing))
2659 dout(" mds%d still flushing cap on %p\n",
2660 session->s_mds,
2661 &list_entry(session->s_cap_flushing.next,
2662 struct ceph_inode_info,
2663 i_flushing_item)->vfs_inode);
2664 mdsc->num_cap_flushing--;
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002665 wake_up_all(&mdsc->cap_flushing_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07002666 dout(" inode %p now !flushing\n", inode);
Sage Weilafcdaea2009-10-14 14:27:38 -07002667
2668 if (ci->i_dirty_caps == 0) {
2669 dout(" inode %p now clean\n", inode);
2670 BUG_ON(!list_empty(&ci->i_dirty_item));
2671 drop = 1;
Sage Weil7d8cb262010-08-24 08:44:16 -07002672 if (ci->i_wrbuffer_ref_head == 0) {
2673 BUG_ON(!ci->i_head_snapc);
2674 ceph_put_snap_context(ci->i_head_snapc);
2675 ci->i_head_snapc = NULL;
2676 }
Sage Weil76e3b392009-10-15 18:13:53 -07002677 } else {
2678 BUG_ON(list_empty(&ci->i_dirty_item));
Sage Weilafcdaea2009-10-14 14:27:38 -07002679 }
Sage Weila8599bd2009-10-06 11:31:12 -07002680 }
2681 spin_unlock(&mdsc->cap_dirty_lock);
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002682 wake_up_all(&ci->i_cap_wq);
Sage Weila8599bd2009-10-06 11:31:12 -07002683
2684out:
Sage Weilbe655592011-11-30 09:47:09 -08002685 spin_unlock(&ci->i_ceph_lock);
Sage Weilafcdaea2009-10-14 14:27:38 -07002686 if (drop)
Sage Weila8599bd2009-10-06 11:31:12 -07002687 iput(inode);
2688}
2689
2690/*
2691 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
2692 * throw away our cap_snap.
2693 *
2694 * Caller hold s_mutex.
2695 */
Sage Weil6df058c2009-12-22 11:24:33 -08002696static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
Sage Weila8599bd2009-10-06 11:31:12 -07002697 struct ceph_mds_caps *m,
2698 struct ceph_mds_session *session)
2699{
2700 struct ceph_inode_info *ci = ceph_inode(inode);
2701 u64 follows = le64_to_cpu(m->snap_follows);
Sage Weila8599bd2009-10-06 11:31:12 -07002702 struct ceph_cap_snap *capsnap;
2703 int drop = 0;
2704
2705 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
2706 inode, ci, session->s_mds, follows);
2707
Sage Weilbe655592011-11-30 09:47:09 -08002708 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002709 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2710 if (capsnap->follows == follows) {
2711 if (capsnap->flush_tid != flush_tid) {
2712 dout(" cap_snap %p follows %lld tid %lld !="
2713 " %lld\n", capsnap, follows,
2714 flush_tid, capsnap->flush_tid);
2715 break;
2716 }
2717 WARN_ON(capsnap->dirty_pages || capsnap->writing);
Sage Weil819ccbf2010-04-01 09:33:46 -07002718 dout(" removing %p cap_snap %p follows %lld\n",
2719 inode, capsnap, follows);
Sage Weila8599bd2009-10-06 11:31:12 -07002720 ceph_put_snap_context(capsnap->context);
2721 list_del(&capsnap->ci_item);
2722 list_del(&capsnap->flushing_item);
2723 ceph_put_cap_snap(capsnap);
2724 drop = 1;
2725 break;
2726 } else {
2727 dout(" skipping cap_snap %p follows %lld\n",
2728 capsnap, capsnap->follows);
2729 }
2730 }
Sage Weilbe655592011-11-30 09:47:09 -08002731 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002732 if (drop)
2733 iput(inode);
2734}
2735
2736/*
2737 * Handle TRUNC from MDS, indicating file truncation.
2738 *
2739 * caller hold s_mutex.
2740 */
2741static void handle_cap_trunc(struct inode *inode,
2742 struct ceph_mds_caps *trunc,
2743 struct ceph_mds_session *session)
Sage Weilbe655592011-11-30 09:47:09 -08002744 __releases(ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07002745{
2746 struct ceph_inode_info *ci = ceph_inode(inode);
2747 int mds = session->s_mds;
2748 int seq = le32_to_cpu(trunc->seq);
2749 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
2750 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
2751 u64 size = le64_to_cpu(trunc->size);
2752 int implemented = 0;
2753 int dirty = __ceph_caps_dirty(ci);
2754 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
2755 int queue_trunc = 0;
2756
2757 issued |= implemented | dirty;
2758
2759 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
2760 inode, mds, seq, truncate_size, truncate_seq);
2761 queue_trunc = ceph_fill_file_size(inode, issued,
2762 truncate_seq, truncate_size, size);
Sage Weilbe655592011-11-30 09:47:09 -08002763 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07002764
Milosz Tanski99ccbd22013-08-21 17:29:54 -04002765 if (queue_trunc) {
Sage Weil3c6f6b72010-02-09 15:24:44 -08002766 ceph_queue_vmtruncate(inode);
Milosz Tanski99ccbd22013-08-21 17:29:54 -04002767 ceph_fscache_invalidate(inode);
2768 }
Sage Weila8599bd2009-10-06 11:31:12 -07002769}
2770
2771/*
2772 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
2773 * different one. If we are the most recent migration we've seen (as
2774 * indicated by mseq), make note of the migrating cap bits for the
2775 * duration (until we see the corresponding IMPORT).
2776 *
2777 * caller holds s_mutex
2778 */
2779static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
Yan, Zheng11df2df2013-11-24 14:44:38 +08002780 struct ceph_mds_cap_peer *ph,
2781 struct ceph_mds_session *session)
Sage Weila8599bd2009-10-06 11:31:12 -07002782{
Sage Weildb354052011-05-24 11:46:31 -07002783 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
Yan, Zheng11df2df2013-11-24 14:44:38 +08002784 struct ceph_mds_session *tsession = NULL;
Yan, Zhengd9df2782014-04-18 09:57:11 +08002785 struct ceph_cap *cap, *tcap, *new_cap = NULL;
Sage Weila8599bd2009-10-06 11:31:12 -07002786 struct ceph_inode_info *ci = ceph_inode(inode);
Yan, Zheng11df2df2013-11-24 14:44:38 +08002787 u64 t_cap_id;
Sage Weila8599bd2009-10-06 11:31:12 -07002788 unsigned mseq = le32_to_cpu(ex->migrate_seq);
Yan, Zheng11df2df2013-11-24 14:44:38 +08002789 unsigned t_seq, t_mseq;
2790 int target, issued;
2791 int mds = session->s_mds;
Sage Weila8599bd2009-10-06 11:31:12 -07002792
Yan, Zheng11df2df2013-11-24 14:44:38 +08002793 if (ph) {
2794 t_cap_id = le64_to_cpu(ph->cap_id);
2795 t_seq = le32_to_cpu(ph->seq);
2796 t_mseq = le32_to_cpu(ph->mseq);
2797 target = le32_to_cpu(ph->mds);
2798 } else {
2799 t_cap_id = t_seq = t_mseq = 0;
2800 target = -1;
Sage Weila8599bd2009-10-06 11:31:12 -07002801 }
2802
Yan, Zheng11df2df2013-11-24 14:44:38 +08002803 dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
2804 inode, ci, mds, mseq, target);
2805retry:
2806 spin_lock(&ci->i_ceph_lock);
2807 cap = __get_cap_for_mds(ci, mds);
Yan, Zhengca665e02014-04-21 15:46:37 +08002808 if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id))
Yan, Zheng11df2df2013-11-24 14:44:38 +08002809 goto out_unlock;
Sage Weil154f42c2010-06-21 13:45:04 -07002810
Yan, Zheng11df2df2013-11-24 14:44:38 +08002811 if (target < 0) {
2812 __ceph_remove_cap(cap, false);
2813 goto out_unlock;
2814 }
Sage Weildb354052011-05-24 11:46:31 -07002815
Yan, Zheng11df2df2013-11-24 14:44:38 +08002816 /*
2817 * now we know we haven't received the cap import message yet
2818 * because the exported cap still exist.
2819 */
2820
2821 issued = cap->issued;
2822 WARN_ON(issued != cap->implemented);
2823
2824 tcap = __get_cap_for_mds(ci, target);
2825 if (tcap) {
2826 /* already have caps from the target */
2827 if (tcap->cap_id != t_cap_id ||
2828 ceph_seq_cmp(tcap->seq, t_seq) < 0) {
2829 dout(" updating import cap %p mds%d\n", tcap, target);
2830 tcap->cap_id = t_cap_id;
2831 tcap->seq = t_seq - 1;
2832 tcap->issue_seq = t_seq - 1;
2833 tcap->mseq = t_mseq;
2834 tcap->issued |= issued;
2835 tcap->implemented |= issued;
2836 if (cap == ci->i_auth_cap)
2837 ci->i_auth_cap = tcap;
2838 if (ci->i_flushing_caps && ci->i_auth_cap == tcap) {
2839 spin_lock(&mdsc->cap_dirty_lock);
2840 list_move_tail(&ci->i_flushing_item,
2841 &tcap->session->s_cap_flushing);
2842 spin_unlock(&mdsc->cap_dirty_lock);
Sage Weildb354052011-05-24 11:46:31 -07002843 }
Sage Weila8599bd2009-10-06 11:31:12 -07002844 }
Yan, Zhenga096b092013-09-22 10:15:58 +08002845 __ceph_remove_cap(cap, false);
Yan, Zheng11df2df2013-11-24 14:44:38 +08002846 goto out_unlock;
Yan, Zhengd9df2782014-04-18 09:57:11 +08002847 } else if (tsession) {
Yan, Zheng11df2df2013-11-24 14:44:38 +08002848 /* add placeholder for the export tagert */
Yan, Zhengd9df2782014-04-18 09:57:11 +08002849 int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;
Yan, Zheng11df2df2013-11-24 14:44:38 +08002850 ceph_add_cap(inode, tsession, t_cap_id, -1, issued, 0,
Yan, Zhengd9df2782014-04-18 09:57:11 +08002851 t_seq - 1, t_mseq, (u64)-1, flag, &new_cap);
2852
2853 __ceph_remove_cap(cap, false);
2854 goto out_unlock;
Yan, Zheng11df2df2013-11-24 14:44:38 +08002855 }
Sage Weila8599bd2009-10-06 11:31:12 -07002856
Sage Weilbe655592011-11-30 09:47:09 -08002857 spin_unlock(&ci->i_ceph_lock);
Yan, Zheng11df2df2013-11-24 14:44:38 +08002858 mutex_unlock(&session->s_mutex);
2859
2860 /* open target session */
2861 tsession = ceph_mdsc_open_export_target_session(mdsc, target);
2862 if (!IS_ERR(tsession)) {
2863 if (mds > target) {
2864 mutex_lock(&session->s_mutex);
2865 mutex_lock_nested(&tsession->s_mutex,
2866 SINGLE_DEPTH_NESTING);
2867 } else {
2868 mutex_lock(&tsession->s_mutex);
2869 mutex_lock_nested(&session->s_mutex,
2870 SINGLE_DEPTH_NESTING);
2871 }
2872 ceph_add_cap_releases(mdsc, tsession);
Yan, Zhengd9df2782014-04-18 09:57:11 +08002873 new_cap = ceph_get_cap(mdsc, NULL);
Yan, Zheng11df2df2013-11-24 14:44:38 +08002874 } else {
2875 WARN_ON(1);
2876 tsession = NULL;
2877 target = -1;
2878 }
2879 goto retry;
2880
2881out_unlock:
2882 spin_unlock(&ci->i_ceph_lock);
2883 mutex_unlock(&session->s_mutex);
2884 if (tsession) {
2885 mutex_unlock(&tsession->s_mutex);
2886 ceph_put_mds_session(tsession);
2887 }
Yan, Zhengd9df2782014-04-18 09:57:11 +08002888 if (new_cap)
2889 ceph_put_cap(mdsc, new_cap);
Sage Weila8599bd2009-10-06 11:31:12 -07002890}
2891
2892/*
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002893 * Handle cap IMPORT.
Sage Weila8599bd2009-10-06 11:31:12 -07002894 *
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002895 * caller holds s_mutex. acquires i_ceph_lock
Sage Weila8599bd2009-10-06 11:31:12 -07002896 */
2897static void handle_cap_import(struct ceph_mds_client *mdsc,
2898 struct inode *inode, struct ceph_mds_caps *im,
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002899 struct ceph_mds_cap_peer *ph,
Sage Weila8599bd2009-10-06 11:31:12 -07002900 struct ceph_mds_session *session,
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002901 struct ceph_cap **target_cap, int *old_issued)
2902 __acquires(ci->i_ceph_lock)
Sage Weila8599bd2009-10-06 11:31:12 -07002903{
2904 struct ceph_inode_info *ci = ceph_inode(inode);
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002905 struct ceph_cap *cap, *ocap, *new_cap = NULL;
Sage Weila8599bd2009-10-06 11:31:12 -07002906 int mds = session->s_mds;
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002907 int issued;
2908 unsigned caps = le32_to_cpu(im->caps);
Sage Weila8599bd2009-10-06 11:31:12 -07002909 unsigned wanted = le32_to_cpu(im->wanted);
2910 unsigned seq = le32_to_cpu(im->seq);
2911 unsigned mseq = le32_to_cpu(im->migrate_seq);
2912 u64 realmino = le64_to_cpu(im->realm);
2913 u64 cap_id = le64_to_cpu(im->cap_id);
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002914 u64 p_cap_id;
2915 int peer;
Sage Weila8599bd2009-10-06 11:31:12 -07002916
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002917 if (ph) {
2918 p_cap_id = le64_to_cpu(ph->cap_id);
2919 peer = le32_to_cpu(ph->mds);
Sage Weila8599bd2009-10-06 11:31:12 -07002920 } else {
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002921 p_cap_id = 0;
2922 peer = -1;
Sage Weila8599bd2009-10-06 11:31:12 -07002923 }
2924
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002925 dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
2926 inode, ci, mds, mseq, peer);
2927
Yan, Zhengd9df2782014-04-18 09:57:11 +08002928retry:
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002929 spin_lock(&ci->i_ceph_lock);
Yan, Zhengd9df2782014-04-18 09:57:11 +08002930 cap = __get_cap_for_mds(ci, mds);
2931 if (!cap) {
2932 if (!new_cap) {
2933 spin_unlock(&ci->i_ceph_lock);
2934 new_cap = ceph_get_cap(mdsc, NULL);
2935 goto retry;
2936 }
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002937 cap = new_cap;
2938 } else {
2939 if (new_cap) {
2940 ceph_put_cap(mdsc, new_cap);
2941 new_cap = NULL;
2942 }
Yan, Zhengd9df2782014-04-18 09:57:11 +08002943 }
2944
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002945 __ceph_caps_issued(ci, &issued);
2946 issued |= __ceph_caps_dirty(ci);
2947
2948 ceph_add_cap(inode, session, cap_id, -1, caps, wanted, seq, mseq,
Yan, Zhengd9df2782014-04-18 09:57:11 +08002949 realmino, CEPH_CAP_FLAG_AUTH, &new_cap);
2950
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002951 ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
2952 if (ocap && ocap->cap_id == p_cap_id) {
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002953 dout(" remove export cap %p mds%d flags %d\n",
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002954 ocap, peer, ph->flags);
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002955 if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002956 (ocap->seq != le32_to_cpu(ph->seq) ||
2957 ocap->mseq != le32_to_cpu(ph->mseq))) {
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002958 pr_err("handle_cap_import: mismatched seq/mseq: "
2959 "ino (%llx.%llx) mds%d seq %d mseq %d "
2960 "importer mds%d has peer seq %d mseq %d\n",
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002961 ceph_vinop(inode), peer, ocap->seq,
2962 ocap->mseq, mds, le32_to_cpu(ph->seq),
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002963 le32_to_cpu(ph->mseq));
2964 }
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002965 __ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002966 }
2967
2968 /* make sure we re-request max_size, if necessary */
2969 ci->i_wanted_max_size = 0;
2970 ci->i_requested_max_size = 0;
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002971
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002972 *old_issued = issued;
2973 *target_cap = cap;
Sage Weila8599bd2009-10-06 11:31:12 -07002974}
2975
2976/*
2977 * Handle a caps message from the MDS.
2978 *
2979 * Identify the appropriate session, inode, and call the right handler
2980 * based on the cap op.
2981 */
2982void ceph_handle_caps(struct ceph_mds_session *session,
2983 struct ceph_msg *msg)
2984{
2985 struct ceph_mds_client *mdsc = session->s_mdsc;
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002986 struct super_block *sb = mdsc->fsc->sb;
Sage Weila8599bd2009-10-06 11:31:12 -07002987 struct inode *inode;
Sage Weilbe655592011-11-30 09:47:09 -08002988 struct ceph_inode_info *ci;
Sage Weila8599bd2009-10-06 11:31:12 -07002989 struct ceph_cap *cap;
2990 struct ceph_mds_caps *h;
Yan, Zheng4ee6a912013-11-24 14:43:46 +08002991 struct ceph_mds_cap_peer *peer = NULL;
Sage Weil2600d2d2010-02-22 15:12:16 -08002992 int mds = session->s_mds;
Yan, Zheng2cd698b2014-04-18 13:20:27 +08002993 int op, issued;
Sage Weil3d7ded42010-06-09 16:47:10 -07002994 u32 seq, mseq;
Sage Weila8599bd2009-10-06 11:31:12 -07002995 struct ceph_vino vino;
2996 u64 cap_id;
2997 u64 size, max_size;
Sage Weil6df058c2009-12-22 11:24:33 -08002998 u64 tid;
Sage Weil70edb552010-03-01 13:20:50 -08002999 void *snaptrace;
Sage Weilce1fbc82010-08-02 15:09:39 -07003000 size_t snaptrace_len;
3001 void *flock;
Yan, Zheng4ee6a912013-11-24 14:43:46 +08003002 void *end;
Sage Weilce1fbc82010-08-02 15:09:39 -07003003 u32 flock_len;
Sage Weila8599bd2009-10-06 11:31:12 -07003004
3005 dout("handle_caps from mds%d\n", mds);
3006
3007 /* decode */
Yan, Zheng4ee6a912013-11-24 14:43:46 +08003008 end = msg->front.iov_base + msg->front.iov_len;
Sage Weil6df058c2009-12-22 11:24:33 -08003009 tid = le64_to_cpu(msg->hdr.tid);
Sage Weila8599bd2009-10-06 11:31:12 -07003010 if (msg->front.iov_len < sizeof(*h))
3011 goto bad;
3012 h = msg->front.iov_base;
3013 op = le32_to_cpu(h->op);
3014 vino.ino = le64_to_cpu(h->ino);
3015 vino.snap = CEPH_NOSNAP;
3016 cap_id = le64_to_cpu(h->cap_id);
3017 seq = le32_to_cpu(h->seq);
Sage Weil3d7ded42010-06-09 16:47:10 -07003018 mseq = le32_to_cpu(h->migrate_seq);
Sage Weila8599bd2009-10-06 11:31:12 -07003019 size = le64_to_cpu(h->size);
3020 max_size = le64_to_cpu(h->max_size);
3021
Sage Weilce1fbc82010-08-02 15:09:39 -07003022 snaptrace = h + 1;
3023 snaptrace_len = le32_to_cpu(h->snap_trace_len);
3024
3025 if (le16_to_cpu(msg->hdr.version) >= 2) {
Yan, Zheng4ee6a912013-11-24 14:43:46 +08003026 void *p = snaptrace + snaptrace_len;
Sage Weilce1fbc82010-08-02 15:09:39 -07003027 ceph_decode_32_safe(&p, end, flock_len, bad);
Yan, Zheng4ee6a912013-11-24 14:43:46 +08003028 if (p + flock_len > end)
3029 goto bad;
Sage Weilce1fbc82010-08-02 15:09:39 -07003030 flock = p;
3031 } else {
3032 flock = NULL;
3033 flock_len = 0;
3034 }
3035
Yan, Zheng4ee6a912013-11-24 14:43:46 +08003036 if (le16_to_cpu(msg->hdr.version) >= 3) {
3037 if (op == CEPH_CAP_OP_IMPORT) {
3038 void *p = flock + flock_len;
3039 if (p + sizeof(*peer) > end)
3040 goto bad;
3041 peer = p;
Yan, Zheng11df2df2013-11-24 14:44:38 +08003042 } else if (op == CEPH_CAP_OP_EXPORT) {
3043 /* recorded in unused fields */
3044 peer = (void *)&h->size;
Yan, Zheng4ee6a912013-11-24 14:43:46 +08003045 }
3046 }
3047
Yan, Zheng6cd3bca2014-09-17 07:45:12 +08003048 /* lookup ino */
3049 inode = ceph_find_inode(sb, vino);
3050 ci = ceph_inode(inode);
3051 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
3052 vino.snap, inode);
3053
Sage Weila8599bd2009-10-06 11:31:12 -07003054 mutex_lock(&session->s_mutex);
3055 session->s_seq++;
3056 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
3057 (unsigned)seq);
3058
Yan, Zheng66f58692013-01-04 14:45:18 +08003059 if (op == CEPH_CAP_OP_IMPORT)
3060 ceph_add_cap_releases(mdsc, session);
3061
Sage Weila8599bd2009-10-06 11:31:12 -07003062 if (!inode) {
3063 dout(" i don't have ino %llx\n", vino.ino);
Sage Weil3d7ded42010-06-09 16:47:10 -07003064
Yan, Zhenga096b092013-09-22 10:15:58 +08003065 if (op == CEPH_CAP_OP_IMPORT) {
3066 spin_lock(&session->s_cap_lock);
Sage Weil3d7ded42010-06-09 16:47:10 -07003067 __queue_cap_release(session, vino.ino, cap_id,
3068 mseq, seq);
Yan, Zhenga096b092013-09-22 10:15:58 +08003069 spin_unlock(&session->s_cap_lock);
3070 }
Greg Farnum21b559d2010-10-06 15:46:30 -07003071 goto flush_cap_releases;
Sage Weila8599bd2009-10-06 11:31:12 -07003072 }
3073
3074 /* these will work even if we don't have a cap yet */
3075 switch (op) {
3076 case CEPH_CAP_OP_FLUSHSNAP_ACK:
Sage Weil6df058c2009-12-22 11:24:33 -08003077 handle_cap_flushsnap_ack(inode, tid, h, session);
Sage Weila8599bd2009-10-06 11:31:12 -07003078 goto done;
3079
3080 case CEPH_CAP_OP_EXPORT:
Yan, Zheng11df2df2013-11-24 14:44:38 +08003081 handle_cap_export(inode, h, peer, session);
3082 goto done_unlocked;
Sage Weila8599bd2009-10-06 11:31:12 -07003083
3084 case CEPH_CAP_OP_IMPORT:
Yan, Zheng4ee6a912013-11-24 14:43:46 +08003085 handle_cap_import(mdsc, inode, h, peer, session,
Yan, Zheng2cd698b2014-04-18 13:20:27 +08003086 &cap, &issued);
3087 handle_cap_grant(mdsc, inode, h, snaptrace, snaptrace_len,
3088 msg->middle, session, cap, issued);
3089 goto done_unlocked;
Sage Weila8599bd2009-10-06 11:31:12 -07003090 }
3091
3092 /* the rest require a cap */
Sage Weilbe655592011-11-30 09:47:09 -08003093 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07003094 cap = __get_cap_for_mds(ceph_inode(inode), mds);
3095 if (!cap) {
Sage Weil9dbd4122010-06-10 13:21:20 -07003096 dout(" no cap on %p ino %llx.%llx from mds%d\n",
Sage Weila8599bd2009-10-06 11:31:12 -07003097 inode, ceph_ino(inode), ceph_snap(inode), mds);
Sage Weilbe655592011-11-30 09:47:09 -08003098 spin_unlock(&ci->i_ceph_lock);
Greg Farnum21b559d2010-10-06 15:46:30 -07003099 goto flush_cap_releases;
Sage Weila8599bd2009-10-06 11:31:12 -07003100 }
3101
Sage Weilbe655592011-11-30 09:47:09 -08003102 /* note that each of these drops i_ceph_lock for us */
Sage Weila8599bd2009-10-06 11:31:12 -07003103 switch (op) {
3104 case CEPH_CAP_OP_REVOKE:
3105 case CEPH_CAP_OP_GRANT:
Yan, Zheng2cd698b2014-04-18 13:20:27 +08003106 __ceph_caps_issued(ci, &issued);
3107 issued |= __ceph_caps_dirty(ci);
3108 handle_cap_grant(mdsc, inode, h, NULL, 0, msg->middle,
3109 session, cap, issued);
Sage Weil15637c82010-03-16 13:42:00 -07003110 goto done_unlocked;
Sage Weila8599bd2009-10-06 11:31:12 -07003111
3112 case CEPH_CAP_OP_FLUSH_ACK:
Sage Weil6df058c2009-12-22 11:24:33 -08003113 handle_cap_flush_ack(inode, tid, h, session, cap);
Sage Weila8599bd2009-10-06 11:31:12 -07003114 break;
3115
3116 case CEPH_CAP_OP_TRUNC:
3117 handle_cap_trunc(inode, h, session);
3118 break;
3119
3120 default:
Sage Weilbe655592011-11-30 09:47:09 -08003121 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07003122 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
3123 ceph_cap_op_name(op));
3124 }
3125
Greg Farnum21b559d2010-10-06 15:46:30 -07003126 goto done;
3127
3128flush_cap_releases:
3129 /*
3130 * send any full release message to try to move things
3131 * along for the mds (who clearly thinks we still have this
3132 * cap).
3133 */
3134 ceph_add_cap_releases(mdsc, session);
3135 ceph_send_cap_releases(mdsc, session);
3136
Sage Weila8599bd2009-10-06 11:31:12 -07003137done:
Sage Weil15637c82010-03-16 13:42:00 -07003138 mutex_unlock(&session->s_mutex);
3139done_unlocked:
Sage Weila8599bd2009-10-06 11:31:12 -07003140 if (inode)
3141 iput(inode);
3142 return;
3143
3144bad:
3145 pr_err("ceph_handle_caps: corrupt message\n");
Sage Weil9ec7cab2009-12-14 15:13:47 -08003146 ceph_msg_dump(msg);
Sage Weila8599bd2009-10-06 11:31:12 -07003147 return;
3148}
3149
3150/*
3151 * Delayed work handler to process end of delayed cap release LRU list.
3152 */
Sage Weilafcdaea2009-10-14 14:27:38 -07003153void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
Sage Weila8599bd2009-10-06 11:31:12 -07003154{
3155 struct ceph_inode_info *ci;
3156 int flags = CHECK_CAPS_NODELAY;
3157
Sage Weila8599bd2009-10-06 11:31:12 -07003158 dout("check_delayed_caps\n");
3159 while (1) {
3160 spin_lock(&mdsc->cap_delay_lock);
3161 if (list_empty(&mdsc->cap_delay_list))
3162 break;
3163 ci = list_first_entry(&mdsc->cap_delay_list,
3164 struct ceph_inode_info,
3165 i_cap_delay_list);
3166 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
3167 time_before(jiffies, ci->i_hold_caps_max))
3168 break;
3169 list_del_init(&ci->i_cap_delay_list);
3170 spin_unlock(&mdsc->cap_delay_lock);
3171 dout("check_delayed_caps on %p\n", &ci->vfs_inode);
3172 ceph_check_caps(ci, flags, NULL);
3173 }
3174 spin_unlock(&mdsc->cap_delay_lock);
3175}
3176
3177/*
Sage Weilafcdaea2009-10-14 14:27:38 -07003178 * Flush all dirty caps to the mds
3179 */
3180void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
3181{
Sage Weildb354052011-05-24 11:46:31 -07003182 struct ceph_inode_info *ci;
3183 struct inode *inode;
Sage Weilafcdaea2009-10-14 14:27:38 -07003184
3185 dout("flush_dirty_caps\n");
3186 spin_lock(&mdsc->cap_dirty_lock);
Sage Weildb354052011-05-24 11:46:31 -07003187 while (!list_empty(&mdsc->cap_dirty)) {
3188 ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info,
3189 i_dirty_item);
Sage Weil70b666c2011-05-27 09:24:26 -07003190 inode = &ci->vfs_inode;
3191 ihold(inode);
Sage Weildb354052011-05-24 11:46:31 -07003192 dout("flush_dirty_caps %p\n", inode);
Sage Weilafcdaea2009-10-14 14:27:38 -07003193 spin_unlock(&mdsc->cap_dirty_lock);
Sage Weil70b666c2011-05-27 09:24:26 -07003194 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL);
3195 iput(inode);
Sage Weilafcdaea2009-10-14 14:27:38 -07003196 spin_lock(&mdsc->cap_dirty_lock);
3197 }
3198 spin_unlock(&mdsc->cap_dirty_lock);
Sage Weildb354052011-05-24 11:46:31 -07003199 dout("flush_dirty_caps done\n");
Sage Weilafcdaea2009-10-14 14:27:38 -07003200}
3201
3202/*
Sage Weila8599bd2009-10-06 11:31:12 -07003203 * Drop open file reference. If we were the last open file,
3204 * we may need to release capabilities to the MDS (or schedule
3205 * their delayed release).
3206 */
3207void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
3208{
3209 struct inode *inode = &ci->vfs_inode;
3210 int last = 0;
3211
Sage Weilbe655592011-11-30 09:47:09 -08003212 spin_lock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07003213 dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode,
3214 ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1);
3215 BUG_ON(ci->i_nr_by_mode[fmode] == 0);
3216 if (--ci->i_nr_by_mode[fmode] == 0)
3217 last++;
Sage Weilbe655592011-11-30 09:47:09 -08003218 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07003219
3220 if (last && ci->i_vino.snap == CEPH_NOSNAP)
3221 ceph_check_caps(ci, 0, NULL);
3222}
3223
3224/*
3225 * Helpers for embedding cap and dentry lease releases into mds
3226 * requests.
3227 *
3228 * @force is used by dentry_release (below) to force inclusion of a
3229 * record for the directory inode, even when there aren't any caps to
3230 * drop.
3231 */
3232int ceph_encode_inode_release(void **p, struct inode *inode,
3233 int mds, int drop, int unless, int force)
3234{
3235 struct ceph_inode_info *ci = ceph_inode(inode);
3236 struct ceph_cap *cap;
3237 struct ceph_mds_request_release *rel = *p;
Sage Weilec97f882010-06-24 15:12:37 -07003238 int used, dirty;
Sage Weila8599bd2009-10-06 11:31:12 -07003239 int ret = 0;
Sage Weila8599bd2009-10-06 11:31:12 -07003240
Sage Weilbe655592011-11-30 09:47:09 -08003241 spin_lock(&ci->i_ceph_lock);
Sage Weil916623d2010-03-16 15:01:07 -07003242 used = __ceph_caps_used(ci);
Sage Weilec97f882010-06-24 15:12:37 -07003243 dirty = __ceph_caps_dirty(ci);
Sage Weil916623d2010-03-16 15:01:07 -07003244
Sage Weilec97f882010-06-24 15:12:37 -07003245 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
3246 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
Sage Weil916623d2010-03-16 15:01:07 -07003247 ceph_cap_string(unless));
3248
Sage Weilec97f882010-06-24 15:12:37 -07003249 /* only drop unused, clean caps */
3250 drop &= ~(used | dirty);
Sage Weil916623d2010-03-16 15:01:07 -07003251
Sage Weila8599bd2009-10-06 11:31:12 -07003252 cap = __get_cap_for_mds(ci, mds);
3253 if (cap && __cap_is_valid(cap)) {
3254 if (force ||
3255 ((cap->issued & drop) &&
3256 (cap->issued & unless) == 0)) {
3257 if ((cap->issued & drop) &&
3258 (cap->issued & unless) == 0) {
Yan, Zhengbb137f82013-06-03 18:22:17 +08003259 int wanted = __ceph_caps_wanted(ci);
3260 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0)
3261 wanted |= cap->mds_wanted;
3262 dout("encode_inode_release %p cap %p "
3263 "%s -> %s, wanted %s -> %s\n", inode, cap,
Sage Weila8599bd2009-10-06 11:31:12 -07003264 ceph_cap_string(cap->issued),
Yan, Zhengbb137f82013-06-03 18:22:17 +08003265 ceph_cap_string(cap->issued & ~drop),
3266 ceph_cap_string(cap->mds_wanted),
3267 ceph_cap_string(wanted));
3268
Sage Weila8599bd2009-10-06 11:31:12 -07003269 cap->issued &= ~drop;
3270 cap->implemented &= ~drop;
Yan, Zhengbb137f82013-06-03 18:22:17 +08003271 cap->mds_wanted = wanted;
Sage Weila8599bd2009-10-06 11:31:12 -07003272 } else {
3273 dout("encode_inode_release %p cap %p %s"
3274 " (force)\n", inode, cap,
3275 ceph_cap_string(cap->issued));
3276 }
3277
3278 rel->ino = cpu_to_le64(ceph_ino(inode));
3279 rel->cap_id = cpu_to_le64(cap->cap_id);
3280 rel->seq = cpu_to_le32(cap->seq);
Himangi Saraogi08a0f242014-07-23 20:11:11 +05303281 rel->issue_seq = cpu_to_le32(cap->issue_seq);
Sage Weila8599bd2009-10-06 11:31:12 -07003282 rel->mseq = cpu_to_le32(cap->mseq);
Yan, Zhengfd7b95c2014-04-17 08:02:02 +08003283 rel->caps = cpu_to_le32(cap->implemented);
Sage Weila8599bd2009-10-06 11:31:12 -07003284 rel->wanted = cpu_to_le32(cap->mds_wanted);
3285 rel->dname_len = 0;
3286 rel->dname_seq = 0;
3287 *p += sizeof(*rel);
3288 ret = 1;
3289 } else {
3290 dout("encode_inode_release %p cap %p %s\n",
3291 inode, cap, ceph_cap_string(cap->issued));
3292 }
3293 }
Sage Weilbe655592011-11-30 09:47:09 -08003294 spin_unlock(&ci->i_ceph_lock);
Sage Weila8599bd2009-10-06 11:31:12 -07003295 return ret;
3296}
3297
3298int ceph_encode_dentry_release(void **p, struct dentry *dentry,
3299 int mds, int drop, int unless)
3300{
3301 struct inode *dir = dentry->d_parent->d_inode;
3302 struct ceph_mds_request_release *rel = *p;
3303 struct ceph_dentry_info *di = ceph_dentry(dentry);
3304 int force = 0;
3305 int ret;
3306
3307 /*
3308 * force an record for the directory caps if we have a dentry lease.
Sage Weilbe655592011-11-30 09:47:09 -08003309 * this is racy (can't take i_ceph_lock and d_lock together), but it
Sage Weila8599bd2009-10-06 11:31:12 -07003310 * doesn't have to be perfect; the mds will revoke anything we don't
3311 * release.
3312 */
3313 spin_lock(&dentry->d_lock);
3314 if (di->lease_session && di->lease_session->s_mds == mds)
3315 force = 1;
3316 spin_unlock(&dentry->d_lock);
3317
3318 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
3319
3320 spin_lock(&dentry->d_lock);
3321 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
3322 dout("encode_dentry_release %p mds%d seq %d\n",
3323 dentry, mds, (int)di->lease_seq);
3324 rel->dname_len = cpu_to_le32(dentry->d_name.len);
3325 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
3326 *p += dentry->d_name.len;
3327 rel->dname_seq = cpu_to_le32(di->lease_seq);
Sage Weil1dadcce2010-07-23 13:54:21 -07003328 __ceph_mdsc_drop_dentry_lease(dentry);
Sage Weila8599bd2009-10-06 11:31:12 -07003329 }
3330 spin_unlock(&dentry->d_lock);
3331 return ret;
3332}