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Commit | Line | Data |
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3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
2f2dc053 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> | |
2f2dc053 SW |
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 | */ | |
19 | int 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 */ | |
25 | if (1 == m->m_max_mds && m->m_info[0].state > 0) | |
26 | return 0; | |
2f2dc053 SW |
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 */ | |
a84cd293 | 36 | n = prandom_u32() % n; |
2f2dc053 SW |
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 | */ | |
51 | struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end) | |
52 | { | |
53 | struct ceph_mdsmap *m; | |
9ec7cab1 | 54 | const void *start = *p; |
2f2dc053 SW |
55 | int i, j, n; |
56 | int err = -EINVAL; | |
d463a43d | 57 | u8 mdsmap_v, mdsmap_cv; |
2f2dc053 SW |
58 | |
59 | m = kzalloc(sizeof(*m), GFP_NOFS); | |
60 | if (m == NULL) | |
61 | return ERR_PTR(-ENOMEM); | |
62 | ||
d463a43d YZ |
63 | ceph_decode_need(p, end, 1 + 1, bad); |
64 | mdsmap_v = ceph_decode_8(p); | |
65 | mdsmap_cv = ceph_decode_8(p); | |
66 | if (mdsmap_v >= 4) { | |
67 | u32 mdsmap_len; | |
68 | ceph_decode_32_safe(p, end, mdsmap_len, bad); | |
69 | if (end < *p + mdsmap_len) | |
70 | goto bad; | |
71 | end = *p + mdsmap_len; | |
4f6a7e5e | 72 | } |
2f2dc053 SW |
73 | |
74 | ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad); | |
c89136ea SW |
75 | m->m_epoch = ceph_decode_32(p); |
76 | m->m_client_epoch = ceph_decode_32(p); | |
77 | m->m_last_failure = ceph_decode_32(p); | |
78 | m->m_root = ceph_decode_32(p); | |
79 | m->m_session_timeout = ceph_decode_32(p); | |
80 | m->m_session_autoclose = ceph_decode_32(p); | |
81 | m->m_max_file_size = ceph_decode_64(p); | |
82 | m->m_max_mds = ceph_decode_32(p); | |
2f2dc053 SW |
83 | |
84 | m->m_info = kcalloc(m->m_max_mds, sizeof(*m->m_info), GFP_NOFS); | |
85 | if (m->m_info == NULL) | |
86 | goto badmem; | |
87 | ||
88 | /* pick out active nodes from mds_info (state > 0) */ | |
c89136ea | 89 | n = ceph_decode_32(p); |
2f2dc053 | 90 | for (i = 0; i < n; i++) { |
94045e11 | 91 | u64 global_id; |
2f2dc053 SW |
92 | u32 namelen; |
93 | s32 mds, inc, state; | |
94 | u64 state_seq; | |
d463a43d YZ |
95 | u8 info_v; |
96 | void *info_end = NULL; | |
2f2dc053 SW |
97 | struct ceph_entity_addr addr; |
98 | u32 num_export_targets; | |
99 | void *pexport_targets = NULL; | |
0deb01c9 | 100 | struct ceph_timespec laggy_since; |
6af86528 | 101 | struct ceph_mds_info *info; |
2f2dc053 | 102 | |
d463a43d | 103 | ceph_decode_need(p, end, sizeof(u64) + 1, bad); |
94045e11 | 104 | global_id = ceph_decode_64(p); |
d463a43d YZ |
105 | info_v= ceph_decode_8(p); |
106 | if (info_v >= 4) { | |
107 | u32 info_len; | |
108 | u8 info_cv; | |
109 | ceph_decode_need(p, end, 1 + sizeof(u32), bad); | |
110 | info_cv = ceph_decode_8(p); | |
111 | info_len = ceph_decode_32(p); | |
112 | info_end = *p + info_len; | |
113 | if (info_end > end) | |
114 | goto bad; | |
115 | } | |
116 | ||
117 | ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad); | |
94045e11 | 118 | *p += sizeof(u64); |
c89136ea | 119 | namelen = ceph_decode_32(p); /* skip mds name */ |
2f2dc053 SW |
120 | *p += namelen; |
121 | ||
122 | ceph_decode_need(p, end, | |
e251e288 | 123 | 4*sizeof(u32) + sizeof(u64) + |
2f2dc053 SW |
124 | sizeof(addr) + sizeof(struct ceph_timespec), |
125 | bad); | |
c89136ea SW |
126 | mds = ceph_decode_32(p); |
127 | inc = ceph_decode_32(p); | |
128 | state = ceph_decode_32(p); | |
129 | state_seq = ceph_decode_64(p); | |
94045e11 SW |
130 | ceph_decode_copy(p, &addr, sizeof(addr)); |
131 | ceph_decode_addr(&addr); | |
0deb01c9 | 132 | ceph_decode_copy(p, &laggy_since, sizeof(laggy_since)); |
2f2dc053 SW |
133 | *p += sizeof(u32); |
134 | ceph_decode_32_safe(p, end, namelen, bad); | |
e251e288 | 135 | *p += namelen; |
d463a43d | 136 | if (info_v >= 2) { |
2f2dc053 SW |
137 | ceph_decode_32_safe(p, end, num_export_targets, bad); |
138 | pexport_targets = *p; | |
e251e288 | 139 | *p += num_export_targets * sizeof(u32); |
2f2dc053 SW |
140 | } else { |
141 | num_export_targets = 0; | |
142 | } | |
143 | ||
d463a43d YZ |
144 | if (info_end && *p != info_end) { |
145 | if (*p > info_end) | |
146 | goto bad; | |
147 | *p = info_end; | |
148 | } | |
149 | ||
94045e11 | 150 | dout("mdsmap_decode %d/%d %lld mds%d.%d %s %s\n", |
3d14c5d2 YS |
151 | i+1, n, global_id, mds, inc, |
152 | ceph_pr_addr(&addr.in_addr), | |
2f2dc053 | 153 | ceph_mds_state_name(state)); |
6af86528 DC |
154 | |
155 | if (mds < 0 || mds >= m->m_max_mds || state <= 0) | |
156 | continue; | |
157 | ||
158 | info = &m->m_info[mds]; | |
159 | info->global_id = global_id; | |
160 | info->state = state; | |
161 | info->addr = addr; | |
162 | info->laggy = (laggy_since.tv_sec != 0 || | |
163 | laggy_since.tv_nsec != 0); | |
164 | info->num_export_targets = num_export_targets; | |
165 | if (num_export_targets) { | |
166 | info->export_targets = kcalloc(num_export_targets, | |
167 | sizeof(u32), GFP_NOFS); | |
168 | if (info->export_targets == NULL) | |
169 | goto badmem; | |
170 | for (j = 0; j < num_export_targets; j++) | |
171 | info->export_targets[j] = | |
172 | ceph_decode_32(&pexport_targets); | |
173 | } else { | |
174 | info->export_targets = NULL; | |
2f2dc053 SW |
175 | } |
176 | } | |
177 | ||
178 | /* pg_pools */ | |
179 | ceph_decode_32_safe(p, end, n, bad); | |
180 | m->m_num_data_pg_pools = n; | |
4f6a7e5e | 181 | m->m_data_pg_pools = kcalloc(n, sizeof(u64), GFP_NOFS); |
2f2dc053 SW |
182 | if (!m->m_data_pg_pools) |
183 | goto badmem; | |
4f6a7e5e | 184 | ceph_decode_need(p, end, sizeof(u64)*(n+1), bad); |
2f2dc053 | 185 | for (i = 0; i < n; i++) |
4f6a7e5e SW |
186 | m->m_data_pg_pools[i] = ceph_decode_64(p); |
187 | m->m_cas_pg_pool = ceph_decode_64(p); | |
2f2dc053 SW |
188 | |
189 | /* ok, we don't care about the rest. */ | |
d463a43d | 190 | *p = end; |
2f2dc053 SW |
191 | dout("mdsmap_decode success epoch %u\n", m->m_epoch); |
192 | return m; | |
193 | ||
194 | badmem: | |
195 | err = -ENOMEM; | |
196 | bad: | |
197 | pr_err("corrupt mdsmap\n"); | |
9ec7cab1 SW |
198 | print_hex_dump(KERN_DEBUG, "mdsmap: ", |
199 | DUMP_PREFIX_OFFSET, 16, 1, | |
200 | start, end - start, true); | |
2f2dc053 | 201 | ceph_mdsmap_destroy(m); |
c213b50b | 202 | return ERR_PTR(err); |
2f2dc053 SW |
203 | } |
204 | ||
205 | void ceph_mdsmap_destroy(struct ceph_mdsmap *m) | |
206 | { | |
207 | int i; | |
208 | ||
209 | for (i = 0; i < m->m_max_mds; i++) | |
210 | kfree(m->m_info[i].export_targets); | |
211 | kfree(m->m_info); | |
212 | kfree(m->m_data_pg_pools); | |
213 | kfree(m); | |
214 | } |