mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 16:07:39 +00:00
0e24421ac4
If the max_mds is decreased in a cephfs cluster, there is a window
of time before the MDSs are removed. If a map goes out during this
period, the mdsmap may show the decreased max_mds but still shows
those MDSes as in or in the export target list.
Ensure that we don't fail the map decode in that case.
Cc: stable@vger.kernel.org
URL: https://tracker.ceph.com/issues/52436
Fixes: d517b3983d ("ceph: reconnect to the export targets on new mdsmaps")
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
422 lines
10 KiB
C
422 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#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"
|
|
|
|
#define CEPH_MDS_IS_READY(i, ignore_laggy) \
|
|
(m->m_info[i].state > 0 && ignore_laggy ? true : !m->m_info[i].laggy)
|
|
|
|
static int __mdsmap_get_random_mds(struct ceph_mdsmap *m, bool ignore_laggy)
|
|
{
|
|
int n = 0;
|
|
int i, j;
|
|
|
|
/* count */
|
|
for (i = 0; i < m->possible_max_rank; i++)
|
|
if (CEPH_MDS_IS_READY(i, ignore_laggy))
|
|
n++;
|
|
if (n == 0)
|
|
return -1;
|
|
|
|
/* pick */
|
|
n = prandom_u32() % n;
|
|
for (j = 0, i = 0; i < m->possible_max_rank; i++) {
|
|
if (CEPH_MDS_IS_READY(i, ignore_laggy))
|
|
j++;
|
|
if (j > n)
|
|
break;
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
/*
|
|
* 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 mds;
|
|
|
|
mds = __mdsmap_get_random_mds(m, false);
|
|
if (mds == m->possible_max_rank || mds == -1)
|
|
mds = __mdsmap_get_random_mds(m, true);
|
|
|
|
return mds == m->possible_max_rank ? -1 : mds;
|
|
}
|
|
|
|
#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, bool msgr2)
|
|
{
|
|
struct ceph_mdsmap *m;
|
|
const void *start = *p;
|
|
int i, j, n;
|
|
int err;
|
|
u8 mdsmap_v;
|
|
u16 mdsmap_ev;
|
|
u32 target;
|
|
|
|
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);
|
|
*p += sizeof(u8); /* mdsmap_cv */
|
|
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);
|
|
|
|
/*
|
|
* pick out the active nodes as the m_num_active_mds, the
|
|
* m_num_active_mds maybe larger than m_max_mds when decreasing
|
|
* the max_mds in cluster side, in other case it should less
|
|
* than or equal to m_max_mds.
|
|
*/
|
|
m->m_num_active_mds = n = ceph_decode_32(p);
|
|
|
|
/*
|
|
* the possible max rank, it maybe larger than the m_num_active_mds,
|
|
* for example if the mds_max == 2 in the cluster, when the MDS(0)
|
|
* was laggy and being replaced by a new MDS, we will temporarily
|
|
* receive a new mds map with n_num_mds == 1 and the active MDS(1),
|
|
* and the mds rank >= m_num_active_mds.
|
|
*/
|
|
m->possible_max_rank = max(m->m_num_active_mds, m->m_max_mds);
|
|
|
|
m->m_info = kcalloc(m->possible_max_rank, sizeof(*m->m_info), GFP_NOFS);
|
|
if (!m->m_info)
|
|
goto nomem;
|
|
|
|
/* pick out active nodes from mds_info (state > 0) */
|
|
for (i = 0; i < n; i++) {
|
|
u64 global_id;
|
|
u32 namelen;
|
|
s32 mds, inc, state;
|
|
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;
|
|
bool laggy;
|
|
|
|
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;
|
|
ceph_decode_need(p, end, 1 + sizeof(u32), bad);
|
|
*p += sizeof(u8); /* info_cv */
|
|
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_32_safe(p, end, mds, bad);
|
|
ceph_decode_32_safe(p, end, inc, bad);
|
|
ceph_decode_32_safe(p, end, state, bad);
|
|
*p += sizeof(u64); /* state_seq */
|
|
if (info_v >= 8)
|
|
err = ceph_decode_entity_addrvec(p, end, msgr2, &addr);
|
|
else
|
|
err = ceph_decode_entity_addr(p, end, &addr);
|
|
if (err)
|
|
goto corrupt;
|
|
|
|
ceph_decode_copy_safe(p, end, &laggy_since, sizeof(laggy_since),
|
|
bad);
|
|
laggy = laggy_since.tv_sec != 0 || laggy_since.tv_nsec != 0;
|
|
*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%s\n",
|
|
i+1, n, global_id, mds, inc,
|
|
ceph_pr_addr(&addr),
|
|
ceph_mds_state_name(state),
|
|
laggy ? "(laggy)" : "");
|
|
|
|
if (mds < 0 || mds >= m->possible_max_rank) {
|
|
pr_warn("mdsmap_decode got incorrect mds(%d)\n", mds);
|
|
continue;
|
|
}
|
|
|
|
if (state <= 0) {
|
|
dout("mdsmap_decode got incorrect state(%s)\n",
|
|
ceph_mds_state_name(state));
|
|
continue;
|
|
}
|
|
|
|
info = &m->m_info[mds];
|
|
info->global_id = global_id;
|
|
info->state = state;
|
|
info->addr = addr;
|
|
info->laggy = laggy;
|
|
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++) {
|
|
target = ceph_decode_32(&pexport_targets);
|
|
info->export_targets[j] = target;
|
|
}
|
|
} else {
|
|
info->export_targets = NULL;
|
|
}
|
|
}
|
|
|
|
/* 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->possible_max_rank) {
|
|
if (m->m_info[mds].laggy)
|
|
num_laggy++;
|
|
}
|
|
}
|
|
m->m_num_laggy = num_laggy;
|
|
|
|
if (n > m->possible_max_rank) {
|
|
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->possible_max_rank = 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:
|
|
dout("mdsmap_decode m_enabled: %d, m_damaged: %d, m_num_laggy: %d\n",
|
|
!!m->m_enabled, !!m->m_damaged, m->m_num_laggy);
|
|
*p = end;
|
|
dout("mdsmap_decode success epoch %u\n", m->m_epoch);
|
|
return m;
|
|
nomem:
|
|
err = -ENOMEM;
|
|
goto out_err;
|
|
corrupt:
|
|
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);
|
|
bad:
|
|
err = -EINVAL;
|
|
goto corrupt;
|
|
}
|
|
|
|
void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
|
|
{
|
|
int i;
|
|
|
|
if (m->m_info) {
|
|
for (i = 0; i < m->possible_max_rank; 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 == m->m_num_active_mds)
|
|
return false;
|
|
for (i = 0; i < m->possible_max_rank; i++) {
|
|
if (m->m_info[i].state == CEPH_MDS_STATE_ACTIVE)
|
|
nr_active++;
|
|
}
|
|
return nr_active > 0;
|
|
}
|