Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / fs / ceph / mdsmap.c
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
17 /*
18  * choose a random mds that is "up" (i.e. has a state > 0), or -1.
19  */
20 int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m)
21 {
22         int n = 0;
23         int i;
24
25         /* special case for one mds */
26         if (1 == m->m_num_mds && m->m_info[0].state > 0)
27                 return 0;
28
29         /* count */
30         for (i = 0; i < m->m_num_mds; i++)
31                 if (m->m_info[i].state > 0)
32                         n++;
33         if (n == 0)
34                 return -1;
35
36         /* pick */
37         n = prandom_u32() % n;
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 #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
73 static 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;
95 bad:
96         return -1;
97 }
98
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  */
105 struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
106 {
107         struct ceph_mdsmap *m;
108         const void *start = *p;
109         int i, j, n;
110         int err;
111         u8 mdsmap_v, mdsmap_cv;
112         u16 mdsmap_ev;
113
114         m = kzalloc(sizeof(*m), GFP_NOFS);
115         if (!m)
116                 return ERR_PTR(-ENOMEM);
117
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;
127         }
128
129         ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad);
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);
138         m->m_num_mds = m->m_max_mds;
139
140         m->m_info = kcalloc(m->m_num_mds, sizeof(*m->m_info), GFP_NOFS);
141         if (!m->m_info)
142                 goto nomem;
143
144         /* pick out active nodes from mds_info (state > 0) */
145         n = ceph_decode_32(p);
146         for (i = 0; i < n; i++) {
147                 u64 global_id;
148                 u32 namelen;
149                 s32 mds, inc, state;
150                 u64 state_seq;
151                 u8 info_v;
152                 void *info_end = NULL;
153                 struct ceph_entity_addr addr;
154                 u32 num_export_targets;
155                 void *pexport_targets = NULL;
156                 struct ceph_timespec laggy_since;
157                 struct ceph_mds_info *info;
158
159                 ceph_decode_need(p, end, sizeof(u64) + 1, bad);
160                 global_id = ceph_decode_64(p);
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);
174                 *p += sizeof(u64);
175                 namelen = ceph_decode_32(p);  /* skip mds name */
176                 *p += namelen;
177
178                 ceph_decode_need(p, end,
179                                  4*sizeof(u32) + sizeof(u64) +
180                                  sizeof(addr) + sizeof(struct ceph_timespec),
181                                  bad);
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);
186                 err = ceph_decode_entity_addr(p, end, &addr);
187                 if (err)
188                         goto corrupt;
189                 ceph_decode_copy(p, &laggy_since, sizeof(laggy_since));
190                 *p += sizeof(u32);
191                 ceph_decode_32_safe(p, end, namelen, bad);
192                 *p += namelen;
193                 if (info_v >= 2) {
194                         ceph_decode_32_safe(p, end, num_export_targets, bad);
195                         pexport_targets = *p;
196                         *p += num_export_targets * sizeof(u32);
197                 } else {
198                         num_export_targets = 0;
199                 }
200
201                 if (info_end && *p != info_end) {
202                         if (*p > info_end)
203                                 goto bad;
204                         *p = info_end;
205                 }
206
207                 dout("mdsmap_decode %d/%d %lld mds%d.%d %s %s\n",
208                      i+1, n, global_id, mds, inc,
209                      ceph_pr_addr(&addr),
210                      ceph_mds_state_name(state));
211
212                 if (mds < 0 || state <= 0)
213                         continue;
214
215                 if (mds >= m->m_num_mds) {
216                         int new_num = max(mds + 1, m->m_num_mds * 2);
217                         void *new_m_info = krealloc(m->m_info,
218                                                 new_num * sizeof(*m->m_info),
219                                                 GFP_NOFS | __GFP_ZERO);
220                         if (!new_m_info)
221                                 goto nomem;
222                         m->m_info = new_m_info;
223                         m->m_num_mds = new_num;
224                 }
225
226                 info = &m->m_info[mds];
227                 info->global_id = global_id;
228                 info->state = state;
229                 info->addr = addr;
230                 info->laggy = (laggy_since.tv_sec != 0 ||
231                                laggy_since.tv_nsec != 0);
232                 info->num_export_targets = num_export_targets;
233                 if (num_export_targets) {
234                         info->export_targets = kcalloc(num_export_targets,
235                                                        sizeof(u32), GFP_NOFS);
236                         if (!info->export_targets)
237                                 goto nomem;
238                         for (j = 0; j < num_export_targets; j++)
239                                 info->export_targets[j] =
240                                        ceph_decode_32(&pexport_targets);
241                 } else {
242                         info->export_targets = NULL;
243                 }
244         }
245         if (m->m_num_mds > m->m_max_mds) {
246                 /* find max up mds */
247                 for (i = m->m_num_mds; i >= m->m_max_mds; i--) {
248                         if (i == 0 || m->m_info[i-1].state > 0)
249                                 break;
250                 }
251                 m->m_num_mds = i;
252         }
253
254         /* pg_pools */
255         ceph_decode_32_safe(p, end, n, bad);
256         m->m_num_data_pg_pools = n;
257         m->m_data_pg_pools = kcalloc(n, sizeof(u64), GFP_NOFS);
258         if (!m->m_data_pg_pools)
259                 goto nomem;
260         ceph_decode_need(p, end, sizeof(u64)*(n+1), bad);
261         for (i = 0; i < n; i++)
262                 m->m_data_pg_pools[i] = ceph_decode_64(p);
263         m->m_cas_pg_pool = ceph_decode_64(p);
264         m->m_enabled = m->m_epoch > 1;
265
266         mdsmap_ev = 1;
267         if (mdsmap_v >= 2) {
268                 ceph_decode_16_safe(p, end, mdsmap_ev, bad_ext);
269         }
270         if (mdsmap_ev >= 3) {
271                 if (__decode_and_drop_compat_set(p, end) < 0)
272                         goto bad_ext;
273         }
274         /* metadata_pool */
275         if (mdsmap_ev < 5) {
276                 __decode_and_drop_type(p, end, u32, bad_ext);
277         } else {
278                 __decode_and_drop_type(p, end, u64, bad_ext);
279         }
280
281         /* created + modified + tableserver */
282         __decode_and_drop_type(p, end, struct ceph_timespec, bad_ext);
283         __decode_and_drop_type(p, end, struct ceph_timespec, bad_ext);
284         __decode_and_drop_type(p, end, u32, bad_ext);
285
286         /* in */
287         {
288                 int num_laggy = 0;
289                 ceph_decode_32_safe(p, end, n, bad_ext);
290                 ceph_decode_need(p, end, sizeof(u32) * n, bad_ext);
291
292                 for (i = 0; i < n; i++) {
293                         s32 mds = ceph_decode_32(p);
294                         if (mds >= 0 && mds < m->m_num_mds) {
295                                 if (m->m_info[mds].laggy)
296                                         num_laggy++;
297                         }
298                 }
299                 m->m_num_laggy = num_laggy;
300
301                 if (n > m->m_num_mds) {
302                         void *new_m_info = krealloc(m->m_info,
303                                                     n * sizeof(*m->m_info),
304                                                     GFP_NOFS | __GFP_ZERO);
305                         if (!new_m_info)
306                                 goto nomem;
307                         m->m_info = new_m_info;
308                 }
309                 m->m_num_mds = n;
310         }
311
312         /* inc */
313         __decode_and_drop_map(p, end, u32, u32, bad_ext);
314         /* up */
315         __decode_and_drop_map(p, end, u32, u64, bad_ext);
316         /* failed */
317         __decode_and_drop_set(p, end, u32, bad_ext);
318         /* stopped */
319         __decode_and_drop_set(p, end, u32, bad_ext);
320
321         if (mdsmap_ev >= 4) {
322                 /* last_failure_osd_epoch */
323                 __decode_and_drop_type(p, end, u32, bad_ext);
324         }
325         if (mdsmap_ev >= 6) {
326                 /* ever_allowed_snaps */
327                 __decode_and_drop_type(p, end, u8, bad_ext);
328                 /* explicitly_allowed_snaps */
329                 __decode_and_drop_type(p, end, u8, bad_ext);
330         }
331         if (mdsmap_ev >= 7) {
332                 /* inline_data_enabled */
333                 __decode_and_drop_type(p, end, u8, bad_ext);
334         }
335         if (mdsmap_ev >= 8) {
336                 u32 name_len;
337                 /* enabled */
338                 ceph_decode_8_safe(p, end, m->m_enabled, bad_ext);
339                 ceph_decode_32_safe(p, end, name_len, bad_ext);
340                 ceph_decode_need(p, end, name_len, bad_ext);
341                 *p += name_len;
342         }
343         /* damaged */
344         if (mdsmap_ev >= 9) {
345                 size_t need;
346                 ceph_decode_32_safe(p, end, n, bad_ext);
347                 need = sizeof(u32) * n;
348                 ceph_decode_need(p, end, need, bad_ext);
349                 *p += need;
350                 m->m_damaged = n > 0;
351         } else {
352                 m->m_damaged = false;
353         }
354 bad_ext:
355         *p = end;
356         dout("mdsmap_decode success epoch %u\n", m->m_epoch);
357         return m;
358 nomem:
359         err = -ENOMEM;
360         goto out_err;
361 corrupt:
362         pr_err("corrupt mdsmap\n");
363         print_hex_dump(KERN_DEBUG, "mdsmap: ",
364                        DUMP_PREFIX_OFFSET, 16, 1,
365                        start, end - start, true);
366 out_err:
367         ceph_mdsmap_destroy(m);
368         return ERR_PTR(err);
369 bad:
370         err = -EINVAL;
371         goto corrupt;
372 }
373
374 void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
375 {
376         int i;
377
378         for (i = 0; i < m->m_num_mds; i++)
379                 kfree(m->m_info[i].export_targets);
380         kfree(m->m_info);
381         kfree(m->m_data_pg_pools);
382         kfree(m);
383 }
384
385 bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m)
386 {
387         int i, nr_active = 0;
388         if (!m->m_enabled)
389                 return false;
390         if (m->m_damaged)
391                 return false;
392         if (m->m_num_laggy > 0)
393                 return false;
394         for (i = 0; i < m->m_num_mds; i++) {
395                 if (m->m_info[i].state == CEPH_MDS_STATE_ACTIVE)
396                         nr_active++;
397         }
398         return nr_active > 0;
399 }