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[mirror_ubuntu-bionic-kernel.git] / fs / ceph / mdsmap.c
CommitLineData
3d14c5d2 1#include <linux/ceph/ceph_debug.h>
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SW
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
3d14c5d2
YS
9#include <linux/ceph/mdsmap.h>
10#include <linux/ceph/messenger.h>
11#include <linux/ceph/decode.h>
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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;
a84cd293
SL
23
24 /* special case for one mds */
76201b63 25 if (1 == m->m_num_mds && m->m_info[0].state > 0)
a84cd293 26 return 0;
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27
28 /* count */
76201b63 29 for (i = 0; i < m->m_num_mds; i++)
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30 if (m->m_info[i].state > 0)
31 n++;
32 if (n == 0)
33 return -1;
34
35 /* pick */
a84cd293 36 n = prandom_u32() % n;
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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
e9e427f0
YZ
45#define __decode_and_drop_type(p, end, type, bad) \
46 do { \
47 if (*p + sizeof(type) > end) \
48 goto bad; \
49 *p += sizeof(type); \
50 } while (0)
51
52#define __decode_and_drop_set(p, end, type, bad) \
53 do { \
54 u32 n; \
55 size_t need; \
56 ceph_decode_32_safe(p, end, n, bad); \
57 need = sizeof(type) * n; \
58 ceph_decode_need(p, end, need, bad); \
59 *p += need; \
60 } while (0)
61
62#define __decode_and_drop_map(p, end, ktype, vtype, bad) \
63 do { \
64 u32 n; \
65 size_t need; \
66 ceph_decode_32_safe(p, end, n, bad); \
67 need = (sizeof(ktype) + sizeof(vtype)) * n; \
68 ceph_decode_need(p, end, need, bad); \
69 *p += need; \
70 } while (0)
71
72
73static int __decode_and_drop_compat_set(void **p, void* end)
74{
75 int i;
76 /* compat, ro_compat, incompat*/
77 for (i = 0; i < 3; i++) {
78 u32 n;
79 ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
80 /* mask */
81 *p += sizeof(u64);
82 /* names (map<u64, string>) */
83 n = ceph_decode_32(p);
84 while (n-- > 0) {
85 u32 len;
86 ceph_decode_need(p, end, sizeof(u64) + sizeof(u32),
87 bad);
88 *p += sizeof(u64);
89 len = ceph_decode_32(p);
90 ceph_decode_need(p, end, len, bad);
91 *p += len;
92 }
93 }
94 return 0;
95bad:
96 return -1;
97}
98
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99/*
100 * Decode an MDS map
101 *
102 * Ignore any fields we don't care about (there are quite a few of
103 * them).
104 */
105struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
106{
107 struct ceph_mdsmap *m;
9ec7cab1 108 const void *start = *p;
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109 int i, j, n;
110 int err = -EINVAL;
d463a43d 111 u8 mdsmap_v, mdsmap_cv;
e9e427f0 112 u16 mdsmap_ev;
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113
114 m = kzalloc(sizeof(*m), GFP_NOFS);
115 if (m == NULL)
116 return ERR_PTR(-ENOMEM);
117
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118 ceph_decode_need(p, end, 1 + 1, bad);
119 mdsmap_v = ceph_decode_8(p);
120 mdsmap_cv = ceph_decode_8(p);
121 if (mdsmap_v >= 4) {
122 u32 mdsmap_len;
123 ceph_decode_32_safe(p, end, mdsmap_len, bad);
124 if (end < *p + mdsmap_len)
125 goto bad;
126 end = *p + mdsmap_len;
4f6a7e5e 127 }
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128
129 ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad);
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130 m->m_epoch = ceph_decode_32(p);
131 m->m_client_epoch = ceph_decode_32(p);
132 m->m_last_failure = ceph_decode_32(p);
133 m->m_root = ceph_decode_32(p);
134 m->m_session_timeout = ceph_decode_32(p);
135 m->m_session_autoclose = ceph_decode_32(p);
136 m->m_max_file_size = ceph_decode_64(p);
137 m->m_max_mds = ceph_decode_32(p);
76201b63 138 m->m_num_mds = m->m_max_mds;
2f2dc053 139
76201b63 140 m->m_info = kcalloc(m->m_num_mds, sizeof(*m->m_info), GFP_NOFS);
2f2dc053 141 if (m->m_info == NULL)
e9e427f0 142 goto nomem;
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SW
143
144 /* pick out active nodes from mds_info (state > 0) */
c89136ea 145 n = ceph_decode_32(p);
2f2dc053 146 for (i = 0; i < n; i++) {
94045e11 147 u64 global_id;
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148 u32 namelen;
149 s32 mds, inc, state;
150 u64 state_seq;
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YZ
151 u8 info_v;
152 void *info_end = NULL;
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153 struct ceph_entity_addr addr;
154 u32 num_export_targets;
155 void *pexport_targets = NULL;
0deb01c9 156 struct ceph_timespec laggy_since;
6af86528 157 struct ceph_mds_info *info;
2f2dc053 158
d463a43d 159 ceph_decode_need(p, end, sizeof(u64) + 1, bad);
94045e11 160 global_id = ceph_decode_64(p);
d463a43d
YZ
161 info_v= ceph_decode_8(p);
162 if (info_v >= 4) {
163 u32 info_len;
164 u8 info_cv;
165 ceph_decode_need(p, end, 1 + sizeof(u32), bad);
166 info_cv = ceph_decode_8(p);
167 info_len = ceph_decode_32(p);
168 info_end = *p + info_len;
169 if (info_end > end)
170 goto bad;
171 }
172
173 ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
94045e11 174 *p += sizeof(u64);
c89136ea 175 namelen = ceph_decode_32(p); /* skip mds name */
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176 *p += namelen;
177
178 ceph_decode_need(p, end,
e251e288 179 4*sizeof(u32) + sizeof(u64) +
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180 sizeof(addr) + sizeof(struct ceph_timespec),
181 bad);
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182 mds = ceph_decode_32(p);
183 inc = ceph_decode_32(p);
184 state = ceph_decode_32(p);
185 state_seq = ceph_decode_64(p);
94045e11
SW
186 ceph_decode_copy(p, &addr, sizeof(addr));
187 ceph_decode_addr(&addr);
0deb01c9 188 ceph_decode_copy(p, &laggy_since, sizeof(laggy_since));
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189 *p += sizeof(u32);
190 ceph_decode_32_safe(p, end, namelen, bad);
e251e288 191 *p += namelen;
d463a43d 192 if (info_v >= 2) {
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193 ceph_decode_32_safe(p, end, num_export_targets, bad);
194 pexport_targets = *p;
e251e288 195 *p += num_export_targets * sizeof(u32);
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SW
196 } else {
197 num_export_targets = 0;
198 }
199
d463a43d
YZ
200 if (info_end && *p != info_end) {
201 if (*p > info_end)
202 goto bad;
203 *p = info_end;
204 }
205
94045e11 206 dout("mdsmap_decode %d/%d %lld mds%d.%d %s %s\n",
3d14c5d2
YS
207 i+1, n, global_id, mds, inc,
208 ceph_pr_addr(&addr.in_addr),
2f2dc053 209 ceph_mds_state_name(state));
6af86528 210
76201b63 211 if (mds < 0 || state <= 0)
6af86528
DC
212 continue;
213
76201b63
YZ
214 if (mds >= m->m_num_mds) {
215 int new_num = max(mds + 1, m->m_num_mds * 2);
216 void *new_m_info = krealloc(m->m_info,
217 new_num * sizeof(*m->m_info),
218 GFP_NOFS | __GFP_ZERO);
219 if (!new_m_info)
220 goto nomem;
221 m->m_info = new_m_info;
222 m->m_num_mds = new_num;
223 }
224
6af86528
DC
225 info = &m->m_info[mds];
226 info->global_id = global_id;
227 info->state = state;
228 info->addr = addr;
229 info->laggy = (laggy_since.tv_sec != 0 ||
230 laggy_since.tv_nsec != 0);
231 info->num_export_targets = num_export_targets;
232 if (num_export_targets) {
233 info->export_targets = kcalloc(num_export_targets,
234 sizeof(u32), GFP_NOFS);
235 if (info->export_targets == NULL)
e9e427f0 236 goto nomem;
6af86528
DC
237 for (j = 0; j < num_export_targets; j++)
238 info->export_targets[j] =
239 ceph_decode_32(&pexport_targets);
240 } else {
241 info->export_targets = NULL;
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242 }
243 }
76201b63
YZ
244 if (m->m_num_mds > m->m_max_mds) {
245 /* find max up mds */
246 for (i = m->m_num_mds; i >= m->m_max_mds; i--) {
247 if (i == 0 || m->m_info[i-1].state > 0)
248 break;
249 }
250 m->m_num_mds = i;
251 }
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252
253 /* pg_pools */
254 ceph_decode_32_safe(p, end, n, bad);
255 m->m_num_data_pg_pools = n;
4f6a7e5e 256 m->m_data_pg_pools = kcalloc(n, sizeof(u64), GFP_NOFS);
2f2dc053 257 if (!m->m_data_pg_pools)
e9e427f0 258 goto nomem;
4f6a7e5e 259 ceph_decode_need(p, end, sizeof(u64)*(n+1), bad);
2f2dc053 260 for (i = 0; i < n; i++)
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SW
261 m->m_data_pg_pools[i] = ceph_decode_64(p);
262 m->m_cas_pg_pool = ceph_decode_64(p);
e9e427f0
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263 m->m_enabled = m->m_epoch > 1;
264
265 mdsmap_ev = 1;
266 if (mdsmap_v >= 2) {
267 ceph_decode_16_safe(p, end, mdsmap_ev, bad_ext);
268 }
269 if (mdsmap_ev >= 3) {
270 if (__decode_and_drop_compat_set(p, end) < 0)
271 goto bad_ext;
272 }
273 /* metadata_pool */
274 if (mdsmap_ev < 5) {
275 __decode_and_drop_type(p, end, u32, bad_ext);
276 } else {
277 __decode_and_drop_type(p, end, u64, bad_ext);
278 }
2f2dc053 279
e9e427f0
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280 /* created + modified + tableserver */
281 __decode_and_drop_type(p, end, struct ceph_timespec, bad_ext);
282 __decode_and_drop_type(p, end, struct ceph_timespec, bad_ext);
283 __decode_and_drop_type(p, end, u32, bad_ext);
284
285 /* in */
286 {
287 int num_laggy = 0;
288 ceph_decode_32_safe(p, end, n, bad_ext);
289 ceph_decode_need(p, end, sizeof(u32) * n, bad_ext);
290
291 for (i = 0; i < n; i++) {
292 s32 mds = ceph_decode_32(p);
76201b63 293 if (mds >= 0 && mds < m->m_num_mds) {
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YZ
294 if (m->m_info[mds].laggy)
295 num_laggy++;
296 }
297 }
298 m->m_num_laggy = num_laggy;
76201b63
YZ
299
300 if (n > m->m_num_mds) {
301 void *new_m_info = krealloc(m->m_info,
302 n * sizeof(*m->m_info),
303 GFP_NOFS | __GFP_ZERO);
304 if (!new_m_info)
305 goto nomem;
306 m->m_info = new_m_info;
307 }
308 m->m_num_mds = n;
e9e427f0
YZ
309 }
310
311 /* inc */
312 __decode_and_drop_map(p, end, u32, u32, bad_ext);
313 /* up */
314 __decode_and_drop_map(p, end, u32, u64, bad_ext);
315 /* failed */
316 __decode_and_drop_set(p, end, u32, bad_ext);
317 /* stopped */
318 __decode_and_drop_set(p, end, u32, bad_ext);
319
320 if (mdsmap_ev >= 4) {
321 /* last_failure_osd_epoch */
322 __decode_and_drop_type(p, end, u32, bad_ext);
323 }
324 if (mdsmap_ev >= 6) {
325 /* ever_allowed_snaps */
326 __decode_and_drop_type(p, end, u8, bad_ext);
327 /* explicitly_allowed_snaps */
328 __decode_and_drop_type(p, end, u8, bad_ext);
329 }
330 if (mdsmap_ev >= 7) {
331 /* inline_data_enabled */
332 __decode_and_drop_type(p, end, u8, bad_ext);
333 }
334 if (mdsmap_ev >= 8) {
335 u32 name_len;
336 /* enabled */
337 ceph_decode_8_safe(p, end, m->m_enabled, bad_ext);
338 ceph_decode_32_safe(p, end, name_len, bad_ext);
339 ceph_decode_need(p, end, name_len, bad_ext);
340 *p += name_len;
341 }
342 /* damaged */
343 if (mdsmap_ev >= 9) {
344 size_t need;
345 ceph_decode_32_safe(p, end, n, bad_ext);
346 need = sizeof(u32) * n;
347 ceph_decode_need(p, end, need, bad_ext);
348 *p += need;
349 m->m_damaged = n > 0;
350 } else {
351 m->m_damaged = false;
352 }
353bad_ext:
d463a43d 354 *p = end;
2f2dc053
SW
355 dout("mdsmap_decode success epoch %u\n", m->m_epoch);
356 return m;
e9e427f0 357nomem:
2f2dc053 358 err = -ENOMEM;
e9e427f0 359 goto out_err;
2f2dc053
SW
360bad:
361 pr_err("corrupt mdsmap\n");
9ec7cab1
SW
362 print_hex_dump(KERN_DEBUG, "mdsmap: ",
363 DUMP_PREFIX_OFFSET, 16, 1,
364 start, end - start, true);
e9e427f0 365out_err:
2f2dc053 366 ceph_mdsmap_destroy(m);
c213b50b 367 return ERR_PTR(err);
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SW
368}
369
370void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
371{
372 int i;
373
76201b63 374 for (i = 0; i < m->m_num_mds; i++)
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SW
375 kfree(m->m_info[i].export_targets);
376 kfree(m->m_info);
377 kfree(m->m_data_pg_pools);
378 kfree(m);
379}
e9e427f0
YZ
380
381bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m)
382{
383 int i, nr_active = 0;
384 if (!m->m_enabled)
385 return false;
386 if (m->m_damaged)
387 return false;
388 if (m->m_num_laggy > 0)
389 return false;
76201b63 390 for (i = 0; i < m->m_num_mds; i++) {
e9e427f0
YZ
391 if (m->m_info[i].state == CEPH_MDS_STATE_ACTIVE)
392 nr_active++;
393 }
394 return nr_active > 0;
395}