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