xref: /linux/fs/ceph/mdsmap.c (revision 0deb01c9998f8112c5e478e3fe3a930131abbc0a)
12f2dc053SSage Weil #include "ceph_debug.h"
22f2dc053SSage Weil 
32f2dc053SSage Weil #include <linux/bug.h>
42f2dc053SSage Weil #include <linux/err.h>
52f2dc053SSage Weil #include <linux/random.h>
62f2dc053SSage Weil #include <linux/slab.h>
72f2dc053SSage Weil #include <linux/types.h>
82f2dc053SSage Weil 
92f2dc053SSage Weil #include "mdsmap.h"
102f2dc053SSage Weil #include "messenger.h"
112f2dc053SSage Weil #include "decode.h"
122f2dc053SSage Weil 
132f2dc053SSage Weil #include "super.h"
142f2dc053SSage Weil 
152f2dc053SSage Weil 
162f2dc053SSage Weil /*
172f2dc053SSage Weil  * choose a random mds that is "up" (i.e. has a state > 0), or -1.
182f2dc053SSage Weil  */
192f2dc053SSage Weil int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m)
202f2dc053SSage Weil {
212f2dc053SSage Weil 	int n = 0;
222f2dc053SSage Weil 	int i;
232f2dc053SSage Weil 	char r;
242f2dc053SSage Weil 
252f2dc053SSage Weil 	/* count */
262f2dc053SSage Weil 	for (i = 0; i < m->m_max_mds; i++)
272f2dc053SSage Weil 		if (m->m_info[i].state > 0)
282f2dc053SSage Weil 			n++;
292f2dc053SSage Weil 	if (n == 0)
302f2dc053SSage Weil 		return -1;
312f2dc053SSage Weil 
322f2dc053SSage Weil 	/* pick */
332f2dc053SSage Weil 	get_random_bytes(&r, 1);
342f2dc053SSage Weil 	n = r % n;
352f2dc053SSage Weil 	i = 0;
362f2dc053SSage Weil 	for (i = 0; n > 0; i++, n--)
372f2dc053SSage Weil 		while (m->m_info[i].state <= 0)
382f2dc053SSage Weil 			i++;
392f2dc053SSage Weil 
402f2dc053SSage Weil 	return i;
412f2dc053SSage Weil }
422f2dc053SSage Weil 
432f2dc053SSage Weil /*
442f2dc053SSage Weil  * Decode an MDS map
452f2dc053SSage Weil  *
462f2dc053SSage Weil  * Ignore any fields we don't care about (there are quite a few of
472f2dc053SSage Weil  * them).
482f2dc053SSage Weil  */
492f2dc053SSage Weil struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
502f2dc053SSage Weil {
512f2dc053SSage Weil 	struct ceph_mdsmap *m;
529ec7cab1SSage Weil 	const void *start = *p;
532f2dc053SSage Weil 	int i, j, n;
542f2dc053SSage Weil 	int err = -EINVAL;
552f2dc053SSage Weil 	u16 version;
562f2dc053SSage Weil 
572f2dc053SSage Weil 	m = kzalloc(sizeof(*m), GFP_NOFS);
582f2dc053SSage Weil 	if (m == NULL)
592f2dc053SSage Weil 		return ERR_PTR(-ENOMEM);
602f2dc053SSage Weil 
612f2dc053SSage Weil 	ceph_decode_16_safe(p, end, version, bad);
622f2dc053SSage Weil 
632f2dc053SSage Weil 	ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad);
64c89136eaSSage Weil 	m->m_epoch = ceph_decode_32(p);
65c89136eaSSage Weil 	m->m_client_epoch = ceph_decode_32(p);
66c89136eaSSage Weil 	m->m_last_failure = ceph_decode_32(p);
67c89136eaSSage Weil 	m->m_root = ceph_decode_32(p);
68c89136eaSSage Weil 	m->m_session_timeout = ceph_decode_32(p);
69c89136eaSSage Weil 	m->m_session_autoclose = ceph_decode_32(p);
70c89136eaSSage Weil 	m->m_max_file_size = ceph_decode_64(p);
71c89136eaSSage Weil 	m->m_max_mds = ceph_decode_32(p);
722f2dc053SSage Weil 
732f2dc053SSage Weil 	m->m_info = kcalloc(m->m_max_mds, sizeof(*m->m_info), GFP_NOFS);
742f2dc053SSage Weil 	if (m->m_info == NULL)
752f2dc053SSage Weil 		goto badmem;
762f2dc053SSage Weil 
772f2dc053SSage Weil 	/* pick out active nodes from mds_info (state > 0) */
78c89136eaSSage Weil 	n = ceph_decode_32(p);
792f2dc053SSage Weil 	for (i = 0; i < n; i++) {
8094045e11SSage Weil 		u64 global_id;
812f2dc053SSage Weil 		u32 namelen;
822f2dc053SSage Weil 		s32 mds, inc, state;
832f2dc053SSage Weil 		u64 state_seq;
842f2dc053SSage Weil 		u8 infoversion;
852f2dc053SSage Weil 		struct ceph_entity_addr addr;
862f2dc053SSage Weil 		u32 num_export_targets;
872f2dc053SSage Weil 		void *pexport_targets = NULL;
88*0deb01c9SSage Weil 		struct ceph_timespec laggy_since;
892f2dc053SSage Weil 
9094045e11SSage Weil 		ceph_decode_need(p, end, sizeof(u64)*2 + 1 + sizeof(u32), bad);
9194045e11SSage Weil 		global_id = ceph_decode_64(p);
92c89136eaSSage Weil 		infoversion = ceph_decode_8(p);
9394045e11SSage Weil 		*p += sizeof(u64);
94c89136eaSSage Weil 		namelen = ceph_decode_32(p);  /* skip mds name */
952f2dc053SSage Weil 		*p += namelen;
962f2dc053SSage Weil 
972f2dc053SSage Weil 		ceph_decode_need(p, end,
98e251e288SSage Weil 				 4*sizeof(u32) + sizeof(u64) +
992f2dc053SSage Weil 				 sizeof(addr) + sizeof(struct ceph_timespec),
1002f2dc053SSage Weil 				 bad);
101c89136eaSSage Weil 		mds = ceph_decode_32(p);
102c89136eaSSage Weil 		inc = ceph_decode_32(p);
103c89136eaSSage Weil 		state = ceph_decode_32(p);
104c89136eaSSage Weil 		state_seq = ceph_decode_64(p);
10594045e11SSage Weil 		ceph_decode_copy(p, &addr, sizeof(addr));
10694045e11SSage Weil 		ceph_decode_addr(&addr);
107*0deb01c9SSage Weil 		ceph_decode_copy(p, &laggy_since, sizeof(laggy_since));
1082f2dc053SSage Weil 		*p += sizeof(u32);
1092f2dc053SSage Weil 		ceph_decode_32_safe(p, end, namelen, bad);
110e251e288SSage Weil 		*p += namelen;
1112f2dc053SSage Weil 		if (infoversion >= 2) {
1122f2dc053SSage Weil 			ceph_decode_32_safe(p, end, num_export_targets, bad);
1132f2dc053SSage Weil 			pexport_targets = *p;
114e251e288SSage Weil 			*p += num_export_targets * sizeof(u32);
1152f2dc053SSage Weil 		} else {
1162f2dc053SSage Weil 			num_export_targets = 0;
1172f2dc053SSage Weil 		}
1182f2dc053SSage Weil 
11994045e11SSage Weil 		dout("mdsmap_decode %d/%d %lld mds%d.%d %s %s\n",
12094045e11SSage Weil 		     i+1, n, global_id, mds, inc, pr_addr(&addr.in_addr),
1212f2dc053SSage Weil 		     ceph_mds_state_name(state));
1222f2dc053SSage Weil 		if (mds >= 0 && mds < m->m_max_mds && state > 0) {
12394045e11SSage Weil 			m->m_info[mds].global_id = global_id;
1242f2dc053SSage Weil 			m->m_info[mds].state = state;
1252f2dc053SSage Weil 			m->m_info[mds].addr = addr;
126*0deb01c9SSage Weil 			m->m_info[mds].laggy =
127*0deb01c9SSage Weil 				(laggy_since.tv_sec != 0 ||
128*0deb01c9SSage Weil 				 laggy_since.tv_nsec != 0);
1292f2dc053SSage Weil 			m->m_info[mds].num_export_targets = num_export_targets;
1302f2dc053SSage Weil 			if (num_export_targets) {
1312f2dc053SSage Weil 				m->m_info[mds].export_targets =
1322f2dc053SSage Weil 					kcalloc(num_export_targets, sizeof(u32),
1332f2dc053SSage Weil 						GFP_NOFS);
1342f2dc053SSage Weil 				for (j = 0; j < num_export_targets; j++)
135c89136eaSSage Weil 					m->m_info[mds].export_targets[j] =
136c89136eaSSage Weil 					       ceph_decode_32(&pexport_targets);
1372f2dc053SSage Weil 			} else {
1382f2dc053SSage Weil 				m->m_info[mds].export_targets = NULL;
1392f2dc053SSage Weil 			}
1402f2dc053SSage Weil 		}
1412f2dc053SSage Weil 	}
1422f2dc053SSage Weil 
1432f2dc053SSage Weil 	/* pg_pools */
1442f2dc053SSage Weil 	ceph_decode_32_safe(p, end, n, bad);
1452f2dc053SSage Weil 	m->m_num_data_pg_pools = n;
1462f2dc053SSage Weil 	m->m_data_pg_pools = kcalloc(n, sizeof(u32), GFP_NOFS);
1472f2dc053SSage Weil 	if (!m->m_data_pg_pools)
1482f2dc053SSage Weil 		goto badmem;
1492f2dc053SSage Weil 	ceph_decode_need(p, end, sizeof(u32)*(n+1), bad);
1502f2dc053SSage Weil 	for (i = 0; i < n; i++)
151c89136eaSSage Weil 		m->m_data_pg_pools[i] = ceph_decode_32(p);
152c89136eaSSage Weil 	m->m_cas_pg_pool = ceph_decode_32(p);
1532f2dc053SSage Weil 
1542f2dc053SSage Weil 	/* ok, we don't care about the rest. */
1552f2dc053SSage Weil 	dout("mdsmap_decode success epoch %u\n", m->m_epoch);
1562f2dc053SSage Weil 	return m;
1572f2dc053SSage Weil 
1582f2dc053SSage Weil badmem:
1592f2dc053SSage Weil 	err = -ENOMEM;
1602f2dc053SSage Weil bad:
1612f2dc053SSage Weil 	pr_err("corrupt mdsmap\n");
1629ec7cab1SSage Weil 	print_hex_dump(KERN_DEBUG, "mdsmap: ",
1639ec7cab1SSage Weil 		       DUMP_PREFIX_OFFSET, 16, 1,
1649ec7cab1SSage Weil 		       start, end - start, true);
1652f2dc053SSage Weil 	ceph_mdsmap_destroy(m);
1662f2dc053SSage Weil 	return ERR_PTR(-EINVAL);
1672f2dc053SSage Weil }
1682f2dc053SSage Weil 
1692f2dc053SSage Weil void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
1702f2dc053SSage Weil {
1712f2dc053SSage Weil 	int i;
1722f2dc053SSage Weil 
1732f2dc053SSage Weil 	for (i = 0; i < m->m_max_mds; i++)
1742f2dc053SSage Weil 		kfree(m->m_info[i].export_targets);
1752f2dc053SSage Weil 	kfree(m->m_info);
1762f2dc053SSage Weil 	kfree(m->m_data_pg_pools);
1772f2dc053SSage Weil 	kfree(m);
1782f2dc053SSage Weil }
179