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1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/bug.h>
4#include <linux/err.h>
5#include <linux/random.h>
6#include <linux/slab.h>
7#include <linux/types.h>
8
9#include <linux/ceph/mdsmap.h>
10#include <linux/ceph/messenger.h>
11#include <linux/ceph/decode.h>
12
13#include "super.h"
14
15
16/*
17 * choose a random mds that is "up" (i.e. has a state > 0), or -1.
18 */
19int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m)
20{
21 int n = 0;
22 int i;
23
24 /* special case for one mds */
25 if (1 == m->m_max_mds && m->m_info[0].state > 0)
26 return 0;
27
28 /* count */
29 for (i = 0; i < m->m_max_mds; i++)
30 if (m->m_info[i].state > 0)
31 n++;
32 if (n == 0)
33 return -1;
34
35 /* pick */
36 n = prandom_u32() % n;
37 i = 0;
38 for (i = 0; n > 0; i++, n--)
39 while (m->m_info[i].state <= 0)
40 i++;
41
42 return i;
43}
44
45/*
46 * Decode an MDS map
47 *
48 * Ignore any fields we don't care about (there are quite a few of
49 * them).
50 */
51struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
52{
53 struct ceph_mdsmap *m;
54 const void *start = *p;
55 int i, j, n;
56 int err = -EINVAL;
57 u16 version;
58
59 m = kzalloc(sizeof(*m), GFP_NOFS);
60 if (m == NULL)
61 return ERR_PTR(-ENOMEM);
62
63 ceph_decode_16_safe(p, end, version, bad);
64 if (version > 3) {
65 pr_warning("got mdsmap version %d > 3, failing", version);
66 goto bad;
67 }
68
69 ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad);
70 m->m_epoch = ceph_decode_32(p);
71 m->m_client_epoch = ceph_decode_32(p);
72 m->m_last_failure = ceph_decode_32(p);
73 m->m_root = ceph_decode_32(p);
74 m->m_session_timeout = ceph_decode_32(p);
75 m->m_session_autoclose = ceph_decode_32(p);
76 m->m_max_file_size = ceph_decode_64(p);
77 m->m_max_mds = ceph_decode_32(p);
78
79 m->m_info = kcalloc(m->m_max_mds, sizeof(*m->m_info), GFP_NOFS);
80 if (m->m_info == NULL)
81 goto badmem;
82
83 /* pick out active nodes from mds_info (state > 0) */
84 n = ceph_decode_32(p);
85 for (i = 0; i < n; i++) {
86 u64 global_id;
87 u32 namelen;
88 s32 mds, inc, state;
89 u64 state_seq;
90 u8 infoversion;
91 struct ceph_entity_addr addr;
92 u32 num_export_targets;
93 void *pexport_targets = NULL;
94 struct ceph_timespec laggy_since;
95 struct ceph_mds_info *info;
96
97 ceph_decode_need(p, end, sizeof(u64)*2 + 1 + sizeof(u32), bad);
98 global_id = ceph_decode_64(p);
99 infoversion = ceph_decode_8(p);
100 *p += sizeof(u64);
101 namelen = ceph_decode_32(p); /* skip mds name */
102 *p += namelen;
103
104 ceph_decode_need(p, end,
105 4*sizeof(u32) + sizeof(u64) +
106 sizeof(addr) + sizeof(struct ceph_timespec),
107 bad);
108 mds = ceph_decode_32(p);
109 inc = ceph_decode_32(p);
110 state = ceph_decode_32(p);
111 state_seq = ceph_decode_64(p);
112 ceph_decode_copy(p, &addr, sizeof(addr));
113 ceph_decode_addr(&addr);
114 ceph_decode_copy(p, &laggy_since, sizeof(laggy_since));
115 *p += sizeof(u32);
116 ceph_decode_32_safe(p, end, namelen, bad);
117 *p += namelen;
118 if (infoversion >= 2) {
119 ceph_decode_32_safe(p, end, num_export_targets, bad);
120 pexport_targets = *p;
121 *p += num_export_targets * sizeof(u32);
122 } else {
123 num_export_targets = 0;
124 }
125
126 dout("mdsmap_decode %d/%d %lld mds%d.%d %s %s\n",
127 i+1, n, global_id, mds, inc,
128 ceph_pr_addr(&addr.in_addr),
129 ceph_mds_state_name(state));
130
131 if (mds < 0 || mds >= m->m_max_mds || state <= 0)
132 continue;
133
134 info = &m->m_info[mds];
135 info->global_id = global_id;
136 info->state = state;
137 info->addr = addr;
138 info->laggy = (laggy_since.tv_sec != 0 ||
139 laggy_since.tv_nsec != 0);
140 info->num_export_targets = num_export_targets;
141 if (num_export_targets) {
142 info->export_targets = kcalloc(num_export_targets,
143 sizeof(u32), GFP_NOFS);
144 if (info->export_targets == NULL)
145 goto badmem;
146 for (j = 0; j < num_export_targets; j++)
147 info->export_targets[j] =
148 ceph_decode_32(&pexport_targets);
149 } else {
150 info->export_targets = NULL;
151 }
152 }
153
154 /* pg_pools */
155 ceph_decode_32_safe(p, end, n, bad);
156 m->m_num_data_pg_pools = n;
157 m->m_data_pg_pools = kcalloc(n, sizeof(u64), GFP_NOFS);
158 if (!m->m_data_pg_pools)
159 goto badmem;
160 ceph_decode_need(p, end, sizeof(u64)*(n+1), bad);
161 for (i = 0; i < n; i++)
162 m->m_data_pg_pools[i] = ceph_decode_64(p);
163 m->m_cas_pg_pool = ceph_decode_64(p);
164
165 /* ok, we don't care about the rest. */
166 dout("mdsmap_decode success epoch %u\n", m->m_epoch);
167 return m;
168
169badmem:
170 err = -ENOMEM;
171bad:
172 pr_err("corrupt mdsmap\n");
173 print_hex_dump(KERN_DEBUG, "mdsmap: ",
174 DUMP_PREFIX_OFFSET, 16, 1,
175 start, end - start, true);
176 ceph_mdsmap_destroy(m);
177 return ERR_PTR(err);
178}
179
180void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
181{
182 int i;
183
184 for (i = 0; i < m->m_max_mds; i++)
185 kfree(m->m_info[i].export_targets);
186 kfree(m->m_info);
187 kfree(m->m_data_pg_pools);
188 kfree(m);
189}
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/bug.h>
5#include <linux/err.h>
6#include <linux/random.h>
7#include <linux/slab.h>
8#include <linux/types.h>
9
10#include <linux/ceph/mdsmap.h>
11#include <linux/ceph/messenger.h>
12#include <linux/ceph/decode.h>
13
14#include "super.h"
15
16#define CEPH_MDS_IS_READY(i, ignore_laggy) \
17 (m->m_info[i].state > 0 && ignore_laggy ? true : !m->m_info[i].laggy)
18
19static int __mdsmap_get_random_mds(struct ceph_mdsmap *m, bool ignore_laggy)
20{
21 int n = 0;
22 int i, j;
23
24 /* count */
25 for (i = 0; i < m->possible_max_rank; i++)
26 if (CEPH_MDS_IS_READY(i, ignore_laggy))
27 n++;
28 if (n == 0)
29 return -1;
30
31 /* pick */
32 n = get_random_u32_below(n);
33 for (j = 0, i = 0; i < m->possible_max_rank; i++) {
34 if (CEPH_MDS_IS_READY(i, ignore_laggy))
35 j++;
36 if (j > n)
37 break;
38 }
39
40 return i;
41}
42
43/*
44 * choose a random mds that is "up" (i.e. has a state > 0), or -1.
45 */
46int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m)
47{
48 int mds;
49
50 mds = __mdsmap_get_random_mds(m, false);
51 if (mds == m->possible_max_rank || mds == -1)
52 mds = __mdsmap_get_random_mds(m, true);
53
54 return mds == m->possible_max_rank ? -1 : mds;
55}
56
57#define __decode_and_drop_type(p, end, type, bad) \
58 do { \
59 if (*p + sizeof(type) > end) \
60 goto bad; \
61 *p += sizeof(type); \
62 } while (0)
63
64#define __decode_and_drop_set(p, end, type, bad) \
65 do { \
66 u32 n; \
67 size_t need; \
68 ceph_decode_32_safe(p, end, n, bad); \
69 need = sizeof(type) * n; \
70 ceph_decode_need(p, end, need, bad); \
71 *p += need; \
72 } while (0)
73
74#define __decode_and_drop_map(p, end, ktype, vtype, bad) \
75 do { \
76 u32 n; \
77 size_t need; \
78 ceph_decode_32_safe(p, end, n, bad); \
79 need = (sizeof(ktype) + sizeof(vtype)) * n; \
80 ceph_decode_need(p, end, need, bad); \
81 *p += need; \
82 } while (0)
83
84
85static int __decode_and_drop_compat_set(void **p, void* end)
86{
87 int i;
88 /* compat, ro_compat, incompat*/
89 for (i = 0; i < 3; i++) {
90 u32 n;
91 ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
92 /* mask */
93 *p += sizeof(u64);
94 /* names (map<u64, string>) */
95 n = ceph_decode_32(p);
96 while (n-- > 0) {
97 u32 len;
98 ceph_decode_need(p, end, sizeof(u64) + sizeof(u32),
99 bad);
100 *p += sizeof(u64);
101 len = ceph_decode_32(p);
102 ceph_decode_need(p, end, len, bad);
103 *p += len;
104 }
105 }
106 return 0;
107bad:
108 return -1;
109}
110
111/*
112 * Decode an MDS map
113 *
114 * Ignore any fields we don't care about (there are quite a few of
115 * them).
116 */
117struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end, bool msgr2)
118{
119 struct ceph_mdsmap *m;
120 const void *start = *p;
121 int i, j, n;
122 int err;
123 u8 mdsmap_v;
124 u16 mdsmap_ev;
125 u32 target;
126
127 m = kzalloc(sizeof(*m), GFP_NOFS);
128 if (!m)
129 return ERR_PTR(-ENOMEM);
130
131 ceph_decode_need(p, end, 1 + 1, bad);
132 mdsmap_v = ceph_decode_8(p);
133 *p += sizeof(u8); /* mdsmap_cv */
134 if (mdsmap_v >= 4) {
135 u32 mdsmap_len;
136 ceph_decode_32_safe(p, end, mdsmap_len, bad);
137 if (end < *p + mdsmap_len)
138 goto bad;
139 end = *p + mdsmap_len;
140 }
141
142 ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad);
143 m->m_epoch = ceph_decode_32(p);
144 m->m_client_epoch = ceph_decode_32(p);
145 m->m_last_failure = ceph_decode_32(p);
146 m->m_root = ceph_decode_32(p);
147 m->m_session_timeout = ceph_decode_32(p);
148 m->m_session_autoclose = ceph_decode_32(p);
149 m->m_max_file_size = ceph_decode_64(p);
150 m->m_max_mds = ceph_decode_32(p);
151
152 /*
153 * pick out the active nodes as the m_num_active_mds, the
154 * m_num_active_mds maybe larger than m_max_mds when decreasing
155 * the max_mds in cluster side, in other case it should less
156 * than or equal to m_max_mds.
157 */
158 m->m_num_active_mds = n = ceph_decode_32(p);
159
160 /*
161 * the possible max rank, it maybe larger than the m_num_active_mds,
162 * for example if the mds_max == 2 in the cluster, when the MDS(0)
163 * was laggy and being replaced by a new MDS, we will temporarily
164 * receive a new mds map with n_num_mds == 1 and the active MDS(1),
165 * and the mds rank >= m_num_active_mds.
166 */
167 m->possible_max_rank = max(m->m_num_active_mds, m->m_max_mds);
168
169 m->m_info = kcalloc(m->possible_max_rank, sizeof(*m->m_info), GFP_NOFS);
170 if (!m->m_info)
171 goto nomem;
172
173 /* pick out active nodes from mds_info (state > 0) */
174 for (i = 0; i < n; i++) {
175 u64 global_id;
176 u32 namelen;
177 s32 mds, inc, state;
178 u8 info_v;
179 void *info_end = NULL;
180 struct ceph_entity_addr addr;
181 u32 num_export_targets;
182 void *pexport_targets = NULL;
183 struct ceph_timespec laggy_since;
184 struct ceph_mds_info *info;
185 bool laggy;
186
187 ceph_decode_need(p, end, sizeof(u64) + 1, bad);
188 global_id = ceph_decode_64(p);
189 info_v= ceph_decode_8(p);
190 if (info_v >= 4) {
191 u32 info_len;
192 ceph_decode_need(p, end, 1 + sizeof(u32), bad);
193 *p += sizeof(u8); /* info_cv */
194 info_len = ceph_decode_32(p);
195 info_end = *p + info_len;
196 if (info_end > end)
197 goto bad;
198 }
199
200 ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
201 *p += sizeof(u64);
202 namelen = ceph_decode_32(p); /* skip mds name */
203 *p += namelen;
204
205 ceph_decode_32_safe(p, end, mds, bad);
206 ceph_decode_32_safe(p, end, inc, bad);
207 ceph_decode_32_safe(p, end, state, bad);
208 *p += sizeof(u64); /* state_seq */
209 if (info_v >= 8)
210 err = ceph_decode_entity_addrvec(p, end, msgr2, &addr);
211 else
212 err = ceph_decode_entity_addr(p, end, &addr);
213 if (err)
214 goto corrupt;
215
216 ceph_decode_copy_safe(p, end, &laggy_since, sizeof(laggy_since),
217 bad);
218 laggy = laggy_since.tv_sec != 0 || laggy_since.tv_nsec != 0;
219 *p += sizeof(u32);
220 ceph_decode_32_safe(p, end, namelen, bad);
221 *p += namelen;
222 if (info_v >= 2) {
223 ceph_decode_32_safe(p, end, num_export_targets, bad);
224 pexport_targets = *p;
225 *p += num_export_targets * sizeof(u32);
226 } else {
227 num_export_targets = 0;
228 }
229
230 if (info_end && *p != info_end) {
231 if (*p > info_end)
232 goto bad;
233 *p = info_end;
234 }
235
236 dout("mdsmap_decode %d/%d %lld mds%d.%d %s %s%s\n",
237 i+1, n, global_id, mds, inc,
238 ceph_pr_addr(&addr),
239 ceph_mds_state_name(state),
240 laggy ? "(laggy)" : "");
241
242 if (mds < 0 || mds >= m->possible_max_rank) {
243 pr_warn("mdsmap_decode got incorrect mds(%d)\n", mds);
244 continue;
245 }
246
247 if (state <= 0) {
248 dout("mdsmap_decode got incorrect state(%s)\n",
249 ceph_mds_state_name(state));
250 continue;
251 }
252
253 info = &m->m_info[mds];
254 info->global_id = global_id;
255 info->state = state;
256 info->addr = addr;
257 info->laggy = laggy;
258 info->num_export_targets = num_export_targets;
259 if (num_export_targets) {
260 info->export_targets = kcalloc(num_export_targets,
261 sizeof(u32), GFP_NOFS);
262 if (!info->export_targets)
263 goto nomem;
264 for (j = 0; j < num_export_targets; j++) {
265 target = ceph_decode_32(&pexport_targets);
266 info->export_targets[j] = target;
267 }
268 } else {
269 info->export_targets = NULL;
270 }
271 }
272
273 /* pg_pools */
274 ceph_decode_32_safe(p, end, n, bad);
275 m->m_num_data_pg_pools = n;
276 m->m_data_pg_pools = kcalloc(n, sizeof(u64), GFP_NOFS);
277 if (!m->m_data_pg_pools)
278 goto nomem;
279 ceph_decode_need(p, end, sizeof(u64)*(n+1), bad);
280 for (i = 0; i < n; i++)
281 m->m_data_pg_pools[i] = ceph_decode_64(p);
282 m->m_cas_pg_pool = ceph_decode_64(p);
283 m->m_enabled = m->m_epoch > 1;
284
285 mdsmap_ev = 1;
286 if (mdsmap_v >= 2) {
287 ceph_decode_16_safe(p, end, mdsmap_ev, bad_ext);
288 }
289 if (mdsmap_ev >= 3) {
290 if (__decode_and_drop_compat_set(p, end) < 0)
291 goto bad_ext;
292 }
293 /* metadata_pool */
294 if (mdsmap_ev < 5) {
295 __decode_and_drop_type(p, end, u32, bad_ext);
296 } else {
297 __decode_and_drop_type(p, end, u64, bad_ext);
298 }
299
300 /* created + modified + tableserver */
301 __decode_and_drop_type(p, end, struct ceph_timespec, bad_ext);
302 __decode_and_drop_type(p, end, struct ceph_timespec, bad_ext);
303 __decode_and_drop_type(p, end, u32, bad_ext);
304
305 /* in */
306 {
307 int num_laggy = 0;
308 ceph_decode_32_safe(p, end, n, bad_ext);
309 ceph_decode_need(p, end, sizeof(u32) * n, bad_ext);
310
311 for (i = 0; i < n; i++) {
312 s32 mds = ceph_decode_32(p);
313 if (mds >= 0 && mds < m->possible_max_rank) {
314 if (m->m_info[mds].laggy)
315 num_laggy++;
316 }
317 }
318 m->m_num_laggy = num_laggy;
319
320 if (n > m->possible_max_rank) {
321 void *new_m_info = krealloc(m->m_info,
322 n * sizeof(*m->m_info),
323 GFP_NOFS | __GFP_ZERO);
324 if (!new_m_info)
325 goto nomem;
326 m->m_info = new_m_info;
327 }
328 m->possible_max_rank = n;
329 }
330
331 /* inc */
332 __decode_and_drop_map(p, end, u32, u32, bad_ext);
333 /* up */
334 __decode_and_drop_map(p, end, u32, u64, bad_ext);
335 /* failed */
336 __decode_and_drop_set(p, end, u32, bad_ext);
337 /* stopped */
338 __decode_and_drop_set(p, end, u32, bad_ext);
339
340 if (mdsmap_ev >= 4) {
341 /* last_failure_osd_epoch */
342 __decode_and_drop_type(p, end, u32, bad_ext);
343 }
344 if (mdsmap_ev >= 6) {
345 /* ever_allowed_snaps */
346 __decode_and_drop_type(p, end, u8, bad_ext);
347 /* explicitly_allowed_snaps */
348 __decode_and_drop_type(p, end, u8, bad_ext);
349 }
350 if (mdsmap_ev >= 7) {
351 /* inline_data_enabled */
352 __decode_and_drop_type(p, end, u8, bad_ext);
353 }
354 if (mdsmap_ev >= 8) {
355 /* enabled */
356 ceph_decode_8_safe(p, end, m->m_enabled, bad_ext);
357 /* fs_name */
358 ceph_decode_skip_string(p, end, bad_ext);
359 }
360 /* damaged */
361 if (mdsmap_ev >= 9) {
362 size_t need;
363 ceph_decode_32_safe(p, end, n, bad_ext);
364 need = sizeof(u32) * n;
365 ceph_decode_need(p, end, need, bad_ext);
366 *p += need;
367 m->m_damaged = n > 0;
368 } else {
369 m->m_damaged = false;
370 }
371 if (mdsmap_ev >= 17) {
372 /* balancer */
373 ceph_decode_skip_string(p, end, bad_ext);
374 /* standby_count_wanted */
375 ceph_decode_skip_32(p, end, bad_ext);
376 /* old_max_mds */
377 ceph_decode_skip_32(p, end, bad_ext);
378 /* min_compat_client */
379 ceph_decode_skip_8(p, end, bad_ext);
380 /* required_client_features */
381 ceph_decode_skip_set(p, end, 64, bad_ext);
382 ceph_decode_64_safe(p, end, m->m_max_xattr_size, bad_ext);
383 } else {
384 /* This forces the usage of the (sync) SETXATTR Op */
385 m->m_max_xattr_size = 0;
386 }
387bad_ext:
388 dout("mdsmap_decode m_enabled: %d, m_damaged: %d, m_num_laggy: %d\n",
389 !!m->m_enabled, !!m->m_damaged, m->m_num_laggy);
390 *p = end;
391 dout("mdsmap_decode success epoch %u\n", m->m_epoch);
392 return m;
393nomem:
394 err = -ENOMEM;
395 goto out_err;
396corrupt:
397 pr_err("corrupt mdsmap\n");
398 print_hex_dump(KERN_DEBUG, "mdsmap: ",
399 DUMP_PREFIX_OFFSET, 16, 1,
400 start, end - start, true);
401out_err:
402 ceph_mdsmap_destroy(m);
403 return ERR_PTR(err);
404bad:
405 err = -EINVAL;
406 goto corrupt;
407}
408
409void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
410{
411 int i;
412
413 if (m->m_info) {
414 for (i = 0; i < m->possible_max_rank; i++)
415 kfree(m->m_info[i].export_targets);
416 kfree(m->m_info);
417 }
418 kfree(m->m_data_pg_pools);
419 kfree(m);
420}
421
422bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m)
423{
424 int i, nr_active = 0;
425 if (!m->m_enabled)
426 return false;
427 if (m->m_damaged)
428 return false;
429 if (m->m_num_laggy == m->m_num_active_mds)
430 return false;
431 for (i = 0; i < m->possible_max_rank; i++) {
432 if (m->m_info[i].state == CEPH_MDS_STATE_ACTIVE)
433 nr_active++;
434 }
435 return nr_active > 0;
436}