396 строки
9.2 KiB
C
396 строки
9.2 KiB
C
#include <linux/ceph/ceph_debug.h>
|
|
|
|
#include <linux/bug.h>
|
|
#include <linux/err.h>
|
|
#include <linux/random.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/ceph/mdsmap.h>
|
|
#include <linux/ceph/messenger.h>
|
|
#include <linux/ceph/decode.h>
|
|
|
|
#include "super.h"
|
|
|
|
|
|
/*
|
|
* choose a random mds that is "up" (i.e. has a state > 0), or -1.
|
|
*/
|
|
int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m)
|
|
{
|
|
int n = 0;
|
|
int i;
|
|
|
|
/* special case for one mds */
|
|
if (1 == m->m_num_mds && m->m_info[0].state > 0)
|
|
return 0;
|
|
|
|
/* count */
|
|
for (i = 0; i < m->m_num_mds; i++)
|
|
if (m->m_info[i].state > 0)
|
|
n++;
|
|
if (n == 0)
|
|
return -1;
|
|
|
|
/* pick */
|
|
n = prandom_u32() % n;
|
|
i = 0;
|
|
for (i = 0; n > 0; i++, n--)
|
|
while (m->m_info[i].state <= 0)
|
|
i++;
|
|
|
|
return i;
|
|
}
|
|
|
|
#define __decode_and_drop_type(p, end, type, bad) \
|
|
do { \
|
|
if (*p + sizeof(type) > end) \
|
|
goto bad; \
|
|
*p += sizeof(type); \
|
|
} while (0)
|
|
|
|
#define __decode_and_drop_set(p, end, type, bad) \
|
|
do { \
|
|
u32 n; \
|
|
size_t need; \
|
|
ceph_decode_32_safe(p, end, n, bad); \
|
|
need = sizeof(type) * n; \
|
|
ceph_decode_need(p, end, need, bad); \
|
|
*p += need; \
|
|
} while (0)
|
|
|
|
#define __decode_and_drop_map(p, end, ktype, vtype, bad) \
|
|
do { \
|
|
u32 n; \
|
|
size_t need; \
|
|
ceph_decode_32_safe(p, end, n, bad); \
|
|
need = (sizeof(ktype) + sizeof(vtype)) * n; \
|
|
ceph_decode_need(p, end, need, bad); \
|
|
*p += need; \
|
|
} while (0)
|
|
|
|
|
|
static int __decode_and_drop_compat_set(void **p, void* end)
|
|
{
|
|
int i;
|
|
/* compat, ro_compat, incompat*/
|
|
for (i = 0; i < 3; i++) {
|
|
u32 n;
|
|
ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
|
|
/* mask */
|
|
*p += sizeof(u64);
|
|
/* names (map<u64, string>) */
|
|
n = ceph_decode_32(p);
|
|
while (n-- > 0) {
|
|
u32 len;
|
|
ceph_decode_need(p, end, sizeof(u64) + sizeof(u32),
|
|
bad);
|
|
*p += sizeof(u64);
|
|
len = ceph_decode_32(p);
|
|
ceph_decode_need(p, end, len, bad);
|
|
*p += len;
|
|
}
|
|
}
|
|
return 0;
|
|
bad:
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Decode an MDS map
|
|
*
|
|
* Ignore any fields we don't care about (there are quite a few of
|
|
* them).
|
|
*/
|
|
struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
|
|
{
|
|
struct ceph_mdsmap *m;
|
|
const void *start = *p;
|
|
int i, j, n;
|
|
int err = -EINVAL;
|
|
u8 mdsmap_v, mdsmap_cv;
|
|
u16 mdsmap_ev;
|
|
|
|
m = kzalloc(sizeof(*m), GFP_NOFS);
|
|
if (!m)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ceph_decode_need(p, end, 1 + 1, bad);
|
|
mdsmap_v = ceph_decode_8(p);
|
|
mdsmap_cv = ceph_decode_8(p);
|
|
if (mdsmap_v >= 4) {
|
|
u32 mdsmap_len;
|
|
ceph_decode_32_safe(p, end, mdsmap_len, bad);
|
|
if (end < *p + mdsmap_len)
|
|
goto bad;
|
|
end = *p + mdsmap_len;
|
|
}
|
|
|
|
ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad);
|
|
m->m_epoch = ceph_decode_32(p);
|
|
m->m_client_epoch = ceph_decode_32(p);
|
|
m->m_last_failure = ceph_decode_32(p);
|
|
m->m_root = ceph_decode_32(p);
|
|
m->m_session_timeout = ceph_decode_32(p);
|
|
m->m_session_autoclose = ceph_decode_32(p);
|
|
m->m_max_file_size = ceph_decode_64(p);
|
|
m->m_max_mds = ceph_decode_32(p);
|
|
m->m_num_mds = m->m_max_mds;
|
|
|
|
m->m_info = kcalloc(m->m_num_mds, sizeof(*m->m_info), GFP_NOFS);
|
|
if (!m->m_info)
|
|
goto nomem;
|
|
|
|
/* pick out active nodes from mds_info (state > 0) */
|
|
n = ceph_decode_32(p);
|
|
for (i = 0; i < n; i++) {
|
|
u64 global_id;
|
|
u32 namelen;
|
|
s32 mds, inc, state;
|
|
u64 state_seq;
|
|
u8 info_v;
|
|
void *info_end = NULL;
|
|
struct ceph_entity_addr addr;
|
|
u32 num_export_targets;
|
|
void *pexport_targets = NULL;
|
|
struct ceph_timespec laggy_since;
|
|
struct ceph_mds_info *info;
|
|
|
|
ceph_decode_need(p, end, sizeof(u64) + 1, bad);
|
|
global_id = ceph_decode_64(p);
|
|
info_v= ceph_decode_8(p);
|
|
if (info_v >= 4) {
|
|
u32 info_len;
|
|
u8 info_cv;
|
|
ceph_decode_need(p, end, 1 + sizeof(u32), bad);
|
|
info_cv = ceph_decode_8(p);
|
|
info_len = ceph_decode_32(p);
|
|
info_end = *p + info_len;
|
|
if (info_end > end)
|
|
goto bad;
|
|
}
|
|
|
|
ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
|
|
*p += sizeof(u64);
|
|
namelen = ceph_decode_32(p); /* skip mds name */
|
|
*p += namelen;
|
|
|
|
ceph_decode_need(p, end,
|
|
4*sizeof(u32) + sizeof(u64) +
|
|
sizeof(addr) + sizeof(struct ceph_timespec),
|
|
bad);
|
|
mds = ceph_decode_32(p);
|
|
inc = ceph_decode_32(p);
|
|
state = ceph_decode_32(p);
|
|
state_seq = ceph_decode_64(p);
|
|
ceph_decode_copy(p, &addr, sizeof(addr));
|
|
ceph_decode_addr(&addr);
|
|
ceph_decode_copy(p, &laggy_since, sizeof(laggy_since));
|
|
*p += sizeof(u32);
|
|
ceph_decode_32_safe(p, end, namelen, bad);
|
|
*p += namelen;
|
|
if (info_v >= 2) {
|
|
ceph_decode_32_safe(p, end, num_export_targets, bad);
|
|
pexport_targets = *p;
|
|
*p += num_export_targets * sizeof(u32);
|
|
} else {
|
|
num_export_targets = 0;
|
|
}
|
|
|
|
if (info_end && *p != info_end) {
|
|
if (*p > info_end)
|
|
goto bad;
|
|
*p = info_end;
|
|
}
|
|
|
|
dout("mdsmap_decode %d/%d %lld mds%d.%d %s %s\n",
|
|
i+1, n, global_id, mds, inc,
|
|
ceph_pr_addr(&addr.in_addr),
|
|
ceph_mds_state_name(state));
|
|
|
|
if (mds < 0 || state <= 0)
|
|
continue;
|
|
|
|
if (mds >= m->m_num_mds) {
|
|
int new_num = max(mds + 1, m->m_num_mds * 2);
|
|
void *new_m_info = krealloc(m->m_info,
|
|
new_num * sizeof(*m->m_info),
|
|
GFP_NOFS | __GFP_ZERO);
|
|
if (!new_m_info)
|
|
goto nomem;
|
|
m->m_info = new_m_info;
|
|
m->m_num_mds = new_num;
|
|
}
|
|
|
|
info = &m->m_info[mds];
|
|
info->global_id = global_id;
|
|
info->state = state;
|
|
info->addr = addr;
|
|
info->laggy = (laggy_since.tv_sec != 0 ||
|
|
laggy_since.tv_nsec != 0);
|
|
info->num_export_targets = num_export_targets;
|
|
if (num_export_targets) {
|
|
info->export_targets = kcalloc(num_export_targets,
|
|
sizeof(u32), GFP_NOFS);
|
|
if (!info->export_targets)
|
|
goto nomem;
|
|
for (j = 0; j < num_export_targets; j++)
|
|
info->export_targets[j] =
|
|
ceph_decode_32(&pexport_targets);
|
|
} else {
|
|
info->export_targets = NULL;
|
|
}
|
|
}
|
|
if (m->m_num_mds > m->m_max_mds) {
|
|
/* find max up mds */
|
|
for (i = m->m_num_mds; i >= m->m_max_mds; i--) {
|
|
if (i == 0 || m->m_info[i-1].state > 0)
|
|
break;
|
|
}
|
|
m->m_num_mds = i;
|
|
}
|
|
|
|
/* pg_pools */
|
|
ceph_decode_32_safe(p, end, n, bad);
|
|
m->m_num_data_pg_pools = n;
|
|
m->m_data_pg_pools = kcalloc(n, sizeof(u64), GFP_NOFS);
|
|
if (!m->m_data_pg_pools)
|
|
goto nomem;
|
|
ceph_decode_need(p, end, sizeof(u64)*(n+1), bad);
|
|
for (i = 0; i < n; i++)
|
|
m->m_data_pg_pools[i] = ceph_decode_64(p);
|
|
m->m_cas_pg_pool = ceph_decode_64(p);
|
|
m->m_enabled = m->m_epoch > 1;
|
|
|
|
mdsmap_ev = 1;
|
|
if (mdsmap_v >= 2) {
|
|
ceph_decode_16_safe(p, end, mdsmap_ev, bad_ext);
|
|
}
|
|
if (mdsmap_ev >= 3) {
|
|
if (__decode_and_drop_compat_set(p, end) < 0)
|
|
goto bad_ext;
|
|
}
|
|
/* metadata_pool */
|
|
if (mdsmap_ev < 5) {
|
|
__decode_and_drop_type(p, end, u32, bad_ext);
|
|
} else {
|
|
__decode_and_drop_type(p, end, u64, bad_ext);
|
|
}
|
|
|
|
/* created + modified + tableserver */
|
|
__decode_and_drop_type(p, end, struct ceph_timespec, bad_ext);
|
|
__decode_and_drop_type(p, end, struct ceph_timespec, bad_ext);
|
|
__decode_and_drop_type(p, end, u32, bad_ext);
|
|
|
|
/* in */
|
|
{
|
|
int num_laggy = 0;
|
|
ceph_decode_32_safe(p, end, n, bad_ext);
|
|
ceph_decode_need(p, end, sizeof(u32) * n, bad_ext);
|
|
|
|
for (i = 0; i < n; i++) {
|
|
s32 mds = ceph_decode_32(p);
|
|
if (mds >= 0 && mds < m->m_num_mds) {
|
|
if (m->m_info[mds].laggy)
|
|
num_laggy++;
|
|
}
|
|
}
|
|
m->m_num_laggy = num_laggy;
|
|
|
|
if (n > m->m_num_mds) {
|
|
void *new_m_info = krealloc(m->m_info,
|
|
n * sizeof(*m->m_info),
|
|
GFP_NOFS | __GFP_ZERO);
|
|
if (!new_m_info)
|
|
goto nomem;
|
|
m->m_info = new_m_info;
|
|
}
|
|
m->m_num_mds = n;
|
|
}
|
|
|
|
/* inc */
|
|
__decode_and_drop_map(p, end, u32, u32, bad_ext);
|
|
/* up */
|
|
__decode_and_drop_map(p, end, u32, u64, bad_ext);
|
|
/* failed */
|
|
__decode_and_drop_set(p, end, u32, bad_ext);
|
|
/* stopped */
|
|
__decode_and_drop_set(p, end, u32, bad_ext);
|
|
|
|
if (mdsmap_ev >= 4) {
|
|
/* last_failure_osd_epoch */
|
|
__decode_and_drop_type(p, end, u32, bad_ext);
|
|
}
|
|
if (mdsmap_ev >= 6) {
|
|
/* ever_allowed_snaps */
|
|
__decode_and_drop_type(p, end, u8, bad_ext);
|
|
/* explicitly_allowed_snaps */
|
|
__decode_and_drop_type(p, end, u8, bad_ext);
|
|
}
|
|
if (mdsmap_ev >= 7) {
|
|
/* inline_data_enabled */
|
|
__decode_and_drop_type(p, end, u8, bad_ext);
|
|
}
|
|
if (mdsmap_ev >= 8) {
|
|
u32 name_len;
|
|
/* enabled */
|
|
ceph_decode_8_safe(p, end, m->m_enabled, bad_ext);
|
|
ceph_decode_32_safe(p, end, name_len, bad_ext);
|
|
ceph_decode_need(p, end, name_len, bad_ext);
|
|
*p += name_len;
|
|
}
|
|
/* damaged */
|
|
if (mdsmap_ev >= 9) {
|
|
size_t need;
|
|
ceph_decode_32_safe(p, end, n, bad_ext);
|
|
need = sizeof(u32) * n;
|
|
ceph_decode_need(p, end, need, bad_ext);
|
|
*p += need;
|
|
m->m_damaged = n > 0;
|
|
} else {
|
|
m->m_damaged = false;
|
|
}
|
|
bad_ext:
|
|
*p = end;
|
|
dout("mdsmap_decode success epoch %u\n", m->m_epoch);
|
|
return m;
|
|
nomem:
|
|
err = -ENOMEM;
|
|
goto out_err;
|
|
bad:
|
|
pr_err("corrupt mdsmap\n");
|
|
print_hex_dump(KERN_DEBUG, "mdsmap: ",
|
|
DUMP_PREFIX_OFFSET, 16, 1,
|
|
start, end - start, true);
|
|
out_err:
|
|
ceph_mdsmap_destroy(m);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < m->m_num_mds; i++)
|
|
kfree(m->m_info[i].export_targets);
|
|
kfree(m->m_info);
|
|
kfree(m->m_data_pg_pools);
|
|
kfree(m);
|
|
}
|
|
|
|
bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m)
|
|
{
|
|
int i, nr_active = 0;
|
|
if (!m->m_enabled)
|
|
return false;
|
|
if (m->m_damaged)
|
|
return false;
|
|
if (m->m_num_laggy > 0)
|
|
return false;
|
|
for (i = 0; i < m->m_num_mds; i++) {
|
|
if (m->m_info[i].state == CEPH_MDS_STATE_ACTIVE)
|
|
nr_active++;
|
|
}
|
|
return nr_active > 0;
|
|
}
|