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ceph: OSD client

Browse Source 
The OSD client is responsible for reading and writing data from/to the
object storage pool.  This includes determining where objects are
stored in the cluster, and ensuring that requests are retried or
redirected in the event of a node failure or data migration.

If an OSD does not respond before a timeout expires, keepalive
messages are sent across the lossless, ordered communications channel
to ensure that any break in the TCP is discovered.  If the session
does reset, a reconnection is attempted and affected requests are
resent (by the message transport layer).

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2009-10-06 11:31:10 -07:00
parent 2f2dc05340
commit f24e9980eb
4 changed files with 2436 additions and 0 deletions
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1294
fs/ceph/osd_client.c Normal file
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144
fs/ceph/osd_client.h Normal file
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#ifndef _FS_CEPH_OSD_CLIENT_H
#define _FS_CEPH_OSD_CLIENT_H
#include <linux/completion.h>
#include <linux/mempool.h>
#include <linux/rbtree.h>
#include "types.h"
#include "osdmap.h"
#include "messenger.h"
struct ceph_msg;
struct ceph_snap_context;
struct ceph_osd_request;
struct ceph_osd_client;
/*
* completion callback for async writepages
*/
typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *,
struct ceph_msg *);
/* a given osd we're communicating with */
struct ceph_osd {
atomic_t o_ref;
struct ceph_osd_client *o_osdc;
int o_osd;
int o_incarnation;
struct rb_node o_node;
struct ceph_connection o_con;
struct list_head o_requests;
};
/* an in-flight request */
struct ceph_osd_request {
u64 r_tid; /* unique for this client */
struct rb_node r_node;
struct list_head r_osd_item;
struct ceph_osd *r_osd;
struct ceph_msg *r_request, *r_reply;
int r_result;
int r_flags; /* any additional flags for the osd */
u32 r_sent; /* >0 if r_request is sending/sent */
int r_prepared_pages, r_got_reply;
struct ceph_osd_client *r_osdc;
atomic_t r_ref;
bool r_mempool;
struct completion r_completion, r_safe_completion;
ceph_osdc_callback_t r_callback, r_safe_callback;
struct ceph_eversion r_reassert_version;
struct list_head r_unsafe_item;
struct inode *r_inode; /* for use by callbacks */
struct writeback_control *r_wbc; /* ditto */
char r_oid[40]; /* object name */
int r_oid_len;
unsigned long r_timeout_stamp;
bool r_resend; /* msg send failed, needs retry */
struct ceph_file_layout r_file_layout;
struct ceph_snap_context *r_snapc; /* snap context for writes */
unsigned r_num_pages; /* size of page array (follows) */
struct page **r_pages; /* pages for data payload */
int r_pages_from_pool;
int r_own_pages; /* if true, i own page list */
};
struct ceph_osd_client {
struct ceph_client *client;
struct ceph_osdmap *osdmap; /* current map */
struct rw_semaphore map_sem;
struct completion map_waiters;
u64 last_requested_map;
struct mutex request_mutex;
struct rb_root osds; /* osds */
u64 timeout_tid; /* tid of timeout triggering rq */
u64 last_tid; /* tid of last request */
struct rb_root requests; /* pending requests */
int num_requests;
struct delayed_work timeout_work;
struct dentry *debugfs_file;
mempool_t *req_mempool;
struct ceph_msgpool msgpool_op;
struct ceph_msgpool msgpool_op_reply;
};
extern int ceph_osdc_init(struct ceph_osd_client *osdc,
struct ceph_client *client);
extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
struct ceph_msg *msg);
extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
struct ceph_msg *msg);
extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
struct ceph_file_layout *layout,
struct ceph_vino vino,
u64 offset, u64 *len, int op, int flags,
struct ceph_snap_context *snapc,
int do_sync, u32 truncate_seq,
u64 truncate_size,
struct timespec *mtime,
bool use_mempool, int num_reply);
static inline void ceph_osdc_get_request(struct ceph_osd_request *req)
{
atomic_inc(&req->r_ref);
}
extern void ceph_osdc_put_request(struct ceph_osd_request *req);
extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req,
bool nofail);
extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req);
extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
struct ceph_vino vino,
struct ceph_file_layout *layout,
u64 off, u64 *plen,
u32 truncate_seq, u64 truncate_size,
struct page **pages, int nr_pages);
extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
struct ceph_vino vino,
struct ceph_file_layout *layout,
struct ceph_snap_context *sc,
u64 off, u64 len,
u32 truncate_seq, u64 truncate_size,
struct timespec *mtime,
struct page **pages, int nr_pages,
int flags, int do_sync, bool nofail);
#endif

875
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#include <asm/div64.h>
#include "super.h"
#include "osdmap.h"
#include "crush/hash.h"
#include "crush/mapper.h"
#include "decode.h"
#include "ceph_debug.h"
char *ceph_osdmap_state_str(char *str, int len, int state)
{
int flag = 0;
if (!len)
goto done;
*str = '\0';
if (state) {
if (state & CEPH_OSD_EXISTS) {
snprintf(str, len, "exists");
flag = 1;
}
if (state & CEPH_OSD_UP) {
snprintf(str, len, "%s%s%s", str, (flag ? ", " : ""),
"up");
flag = 1;
}
} else {
snprintf(str, len, "doesn't exist");
}
done:
return str;
}
/* maps */
static int calc_bits_of(unsigned t)
{
int b = 0;
while (t) {
t = t >> 1;
b++;
}
return b;
}
/*
* the foo_mask is the smallest value 2^n-1 that is >= foo.
*/
static void calc_pg_masks(struct ceph_pg_pool_info *pi)
{
pi->pg_num_mask = (1 << calc_bits_of(le32_to_cpu(pi->v.pg_num)-1)) - 1;
pi->pgp_num_mask =
(1 << calc_bits_of(le32_to_cpu(pi->v.pgp_num)-1)) - 1;
pi->lpg_num_mask =
(1 << calc_bits_of(le32_to_cpu(pi->v.lpg_num)-1)) - 1;
pi->lpgp_num_mask =
(1 << calc_bits_of(le32_to_cpu(pi->v.lpgp_num)-1)) - 1;
}
/*
* decode crush map
*/
static int crush_decode_uniform_bucket(void **p, void *end,
struct crush_bucket_uniform *b)
{
dout("crush_decode_uniform_bucket %p to %p\n", *p, end);
ceph_decode_need(p, end, (1+b->h.size) * sizeof(u32), bad);
ceph_decode_32(p, b->item_weight);
return 0;
bad:
return -EINVAL;
}
static int crush_decode_list_bucket(void **p, void *end,
struct crush_bucket_list *b)
{
int j;
dout("crush_decode_list_bucket %p to %p\n", *p, end);
b->item_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
if (b->item_weights == NULL)
return -ENOMEM;
b->sum_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
if (b->sum_weights == NULL)
return -ENOMEM;
ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
for (j = 0; j < b->h.size; j++) {
ceph_decode_32(p, b->item_weights[j]);
ceph_decode_32(p, b->sum_weights[j]);
}
return 0;
bad:
return -EINVAL;
}
static int crush_decode_tree_bucket(void **p, void *end,
struct crush_bucket_tree *b)
{
int j;
dout("crush_decode_tree_bucket %p to %p\n", *p, end);
ceph_decode_32_safe(p, end, b->num_nodes, bad);
b->node_weights = kcalloc(b->num_nodes, sizeof(u32), GFP_NOFS);
if (b->node_weights == NULL)
return -ENOMEM;
ceph_decode_need(p, end, b->num_nodes * sizeof(u32), bad);
for (j = 0; j < b->num_nodes; j++)
ceph_decode_32(p, b->node_weights[j]);
return 0;
bad:
return -EINVAL;
}
static int crush_decode_straw_bucket(void **p, void *end,
struct crush_bucket_straw *b)
{
int j;
dout("crush_decode_straw_bucket %p to %p\n", *p, end);
b->item_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
if (b->item_weights == NULL)
return -ENOMEM;
b->straws = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
if (b->straws == NULL)
return -ENOMEM;
ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
for (j = 0; j < b->h.size; j++) {
ceph_decode_32(p, b->item_weights[j]);
ceph_decode_32(p, b->straws[j]);
}
return 0;
bad:
return -EINVAL;
}
static struct crush_map *crush_decode(void *pbyval, void *end)
{
struct crush_map *c;
int err = -EINVAL;
int i, j;
void **p = &pbyval;
void *start = pbyval;
u32 magic;
dout("crush_decode %p to %p len %d\n", *p, end, (int)(end - *p));
c = kzalloc(sizeof(*c), GFP_NOFS);
if (c == NULL)
return ERR_PTR(-ENOMEM);
ceph_decode_need(p, end, 4*sizeof(u32), bad);
ceph_decode_32(p, magic);
if (magic != CRUSH_MAGIC) {
pr_err("crush_decode magic %x != current %x\n",
(unsigned)magic, (unsigned)CRUSH_MAGIC);
goto bad;
}
ceph_decode_32(p, c->max_buckets);
ceph_decode_32(p, c->max_rules);
ceph_decode_32(p, c->max_devices);
c->device_parents = kcalloc(c->max_devices, sizeof(u32), GFP_NOFS);
if (c->device_parents == NULL)
goto badmem;
c->bucket_parents = kcalloc(c->max_buckets, sizeof(u32), GFP_NOFS);
if (c->bucket_parents == NULL)
goto badmem;
c->buckets = kcalloc(c->max_buckets, sizeof(*c->buckets), GFP_NOFS);
if (c->buckets == NULL)
goto badmem;
c->rules = kcalloc(c->max_rules, sizeof(*c->rules), GFP_NOFS);
if (c->rules == NULL)
goto badmem;
/* buckets */
for (i = 0; i < c->max_buckets; i++) {
int size = 0;
u32 alg;
struct crush_bucket *b;
ceph_decode_32_safe(p, end, alg, bad);
if (alg == 0) {
c->buckets[i] = NULL;
continue;
}
dout("crush_decode bucket %d off %x %p to %p\n",
i, (int)(*p-start), *p, end);
switch (alg) {
case CRUSH_BUCKET_UNIFORM:
size = sizeof(struct crush_bucket_uniform);
break;
case CRUSH_BUCKET_LIST:
size = sizeof(struct crush_bucket_list);
break;
case CRUSH_BUCKET_TREE:
size = sizeof(struct crush_bucket_tree);
break;
case CRUSH_BUCKET_STRAW:
size = sizeof(struct crush_bucket_straw);
break;
default:
goto bad;
}
BUG_ON(size == 0);
b = c->buckets[i] = kzalloc(size, GFP_NOFS);
if (b == NULL)
goto badmem;
ceph_decode_need(p, end, 4*sizeof(u32), bad);
ceph_decode_32(p, b->id);
ceph_decode_16(p, b->type);
ceph_decode_16(p, b->alg);
ceph_decode_32(p, b->weight);
ceph_decode_32(p, b->size);
dout("crush_decode bucket size %d off %x %p to %p\n",
b->size, (int)(*p-start), *p, end);
b->items = kcalloc(b->size, sizeof(__s32), GFP_NOFS);
if (b->items == NULL)
goto badmem;
b->perm = kcalloc(b->size, sizeof(u32), GFP_NOFS);
if (b->perm == NULL)
goto badmem;
b->perm_n = 0;
ceph_decode_need(p, end, b->size*sizeof(u32), bad);
for (j = 0; j < b->size; j++)
ceph_decode_32(p, b->items[j]);
switch (b->alg) {
case CRUSH_BUCKET_UNIFORM:
err = crush_decode_uniform_bucket(p, end,
(struct crush_bucket_uniform *)b);
if (err < 0)
goto bad;
break;
case CRUSH_BUCKET_LIST:
err = crush_decode_list_bucket(p, end,
(struct crush_bucket_list *)b);
if (err < 0)
goto bad;
break;
case CRUSH_BUCKET_TREE:
err = crush_decode_tree_bucket(p, end,
(struct crush_bucket_tree *)b);
if (err < 0)
goto bad;
break;
case CRUSH_BUCKET_STRAW:
err = crush_decode_straw_bucket(p, end,
(struct crush_bucket_straw *)b);
if (err < 0)
goto bad;
break;
}
}
/* rules */
dout("rule vec is %p\n", c->rules);
for (i = 0; i < c->max_rules; i++) {
u32 yes;
struct crush_rule *r;
ceph_decode_32_safe(p, end, yes, bad);
if (!yes) {
dout("crush_decode NO rule %d off %x %p to %p\n",
i, (int)(*p-start), *p, end);
c->rules[i] = NULL;
continue;
}
dout("crush_decode rule %d off %x %p to %p\n",
i, (int)(*p-start), *p, end);
/* len */
ceph_decode_32_safe(p, end, yes, bad);
#if BITS_PER_LONG == 32
if (yes > ULONG_MAX / sizeof(struct crush_rule_step))
goto bad;
#endif
r = c->rules[i] = kmalloc(sizeof(*r) +
yes*sizeof(struct crush_rule_step),
GFP_NOFS);
if (r == NULL)
goto badmem;
dout(" rule %d is at %p\n", i, r);
r->len = yes;
ceph_decode_copy_safe(p, end, &r->mask, 4, bad); /* 4 u8's */
ceph_decode_need(p, end, r->len*3*sizeof(u32), bad);
for (j = 0; j < r->len; j++) {
ceph_decode_32(p, r->steps[j].op);
ceph_decode_32(p, r->steps[j].arg1);
ceph_decode_32(p, r->steps[j].arg2);
}
}
/* ignore trailing name maps. */
dout("crush_decode success\n");
return c;
badmem:
err = -ENOMEM;
bad:
dout("crush_decode fail %d\n", err);
crush_destroy(c);
return ERR_PTR(err);
}
/*
* osd map
*/
void ceph_osdmap_destroy(struct ceph_osdmap *map)
{
dout("osdmap_destroy %p\n", map);
if (map->crush)
crush_destroy(map->crush);
while (!RB_EMPTY_ROOT(&map->pg_temp))
rb_erase(rb_first(&map->pg_temp), &map->pg_temp);
kfree(map->osd_state);
kfree(map->osd_weight);
kfree(map->pg_pool);
kfree(map->osd_addr);
kfree(map);
}
/*
* adjust max osd value. reallocate arrays.
*/
static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
{
u8 *state;
struct ceph_entity_addr *addr;
u32 *weight;
state = kcalloc(max, sizeof(*state), GFP_NOFS);
addr = kcalloc(max, sizeof(*addr), GFP_NOFS);
weight = kcalloc(max, sizeof(*weight), GFP_NOFS);
if (state == NULL || addr == NULL || weight == NULL) {
kfree(state);
kfree(addr);
kfree(weight);
return -ENOMEM;
}
/* copy old? */
if (map->osd_state) {
memcpy(state, map->osd_state, map->max_osd*sizeof(*state));
memcpy(addr, map->osd_addr, map->max_osd*sizeof(*addr));
memcpy(weight, map->osd_weight, map->max_osd*sizeof(*weight));
kfree(map->osd_state);
kfree(map->osd_addr);
kfree(map->osd_weight);
}
map->osd_state = state;
map->osd_weight = weight;
map->osd_addr = addr;
map->max_osd = max;
return 0;
}
/*
* Insert a new pg_temp mapping
*/
static void __insert_pg_mapping(struct ceph_pg_mapping *new,
struct rb_root *root)
{
struct rb_node **p = &root->rb_node;
struct rb_node *parent = NULL;
struct ceph_pg_mapping *pg = NULL;
while (*p) {
parent = *p;
pg = rb_entry(parent, struct ceph_pg_mapping, node);
if (new->pgid < pg->pgid)
p = &(*p)->rb_left;
else if (new->pgid > pg->pgid)
p = &(*p)->rb_right;
else
BUG();
}
rb_link_node(&new->node, parent, p);
rb_insert_color(&new->node, root);
}
/*
* decode a full map.
*/
struct ceph_osdmap *osdmap_decode(void **p, void *end)
{
struct ceph_osdmap *map;
u16 version;
u32 len, max, i;
int err = -EINVAL;
void *start = *p;
dout("osdmap_decode %p to %p len %d\n", *p, end, (int)(end - *p));
map = kzalloc(sizeof(*map), GFP_NOFS);
if (map == NULL)
return ERR_PTR(-ENOMEM);
map->pg_temp = RB_ROOT;
ceph_decode_16_safe(p, end, version, bad);
ceph_decode_need(p, end, 2*sizeof(u64)+6*sizeof(u32), bad);
ceph_decode_copy(p, &map->fsid, sizeof(map->fsid));
ceph_decode_32(p, map->epoch);
ceph_decode_copy(p, &map->created, sizeof(map->created));
ceph_decode_copy(p, &map->modified, sizeof(map->modified));
ceph_decode_32(p, map->num_pools);
map->pg_pool = kcalloc(map->num_pools, sizeof(*map->pg_pool),
GFP_NOFS);
if (!map->pg_pool) {
err = -ENOMEM;
goto bad;
}
ceph_decode_32_safe(p, end, max, bad);
while (max--) {
ceph_decode_need(p, end, 4+sizeof(map->pg_pool->v), bad);
ceph_decode_32(p, i);
if (i >= map->num_pools)
goto bad;
ceph_decode_copy(p, &map->pg_pool[i].v,
sizeof(map->pg_pool->v));
calc_pg_masks(&map->pg_pool[i]);
p += le32_to_cpu(map->pg_pool[i].v.num_snaps) * sizeof(u64);
p += le32_to_cpu(map->pg_pool[i].v.num_removed_snap_intervals)
* sizeof(u64) * 2;
}
ceph_decode_32_safe(p, end, map->flags, bad);
ceph_decode_32(p, max);
/* (re)alloc osd arrays */
err = osdmap_set_max_osd(map, max);
if (err < 0)
goto bad;
dout("osdmap_decode max_osd = %d\n", map->max_osd);
/* osds */
err = -EINVAL;
ceph_decode_need(p, end, 3*sizeof(u32) +
map->max_osd*(1 + sizeof(*map->osd_weight) +
sizeof(*map->osd_addr)), bad);
*p += 4; /* skip length field (should match max) */
ceph_decode_copy(p, map->osd_state, map->max_osd);
*p += 4; /* skip length field (should match max) */
for (i = 0; i < map->max_osd; i++)
ceph_decode_32(p, map->osd_weight[i]);
*p += 4; /* skip length field (should match max) */
ceph_decode_copy(p, map->osd_addr, map->max_osd*sizeof(*map->osd_addr));
/* pg_temp */
ceph_decode_32_safe(p, end, len, bad);
for (i = 0; i < len; i++) {
int n, j;
u64 pgid;
struct ceph_pg_mapping *pg;
ceph_decode_need(p, end, sizeof(u32) + sizeof(u64), bad);
ceph_decode_64(p, pgid);
ceph_decode_32(p, n);
ceph_decode_need(p, end, n * sizeof(u32), bad);
pg = kmalloc(sizeof(*pg) + n*sizeof(u32), GFP_NOFS);
if (!pg) {
err = -ENOMEM;
goto bad;
}
pg->pgid = pgid;
pg->len = n;
for (j = 0; j < n; j++)
ceph_decode_32(p, pg->osds[j]);
__insert_pg_mapping(pg, &map->pg_temp);
dout(" added pg_temp %llx len %d\n", pgid, len);
}
/* crush */
ceph_decode_32_safe(p, end, len, bad);
dout("osdmap_decode crush len %d from off 0x%x\n", len,
(int)(*p - start));
ceph_decode_need(p, end, len, bad);
map->crush = crush_decode(*p, end);
*p += len;
if (IS_ERR(map->crush)) {
err = PTR_ERR(map->crush);
map->crush = NULL;
goto bad;
}
/* ignore the rest of the map */
*p = end;
dout("osdmap_decode done %p %p\n", *p, end);
return map;
bad:
dout("osdmap_decode fail\n");
ceph_osdmap_destroy(map);
return ERR_PTR(err);
}
/*
* decode and apply an incremental map update.
*/
struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
struct ceph_osdmap *map,
struct ceph_messenger *msgr)
{
struct ceph_osdmap *newmap = map;
struct crush_map *newcrush = NULL;
struct ceph_fsid fsid;
u32 epoch = 0;
struct ceph_timespec modified;
u32 len, pool;
__s32 new_flags, max;
void *start = *p;
int err = -EINVAL;
u16 version;
struct rb_node *rbp;
ceph_decode_16_safe(p, end, version, bad);
ceph_decode_need(p, end, sizeof(fsid)+sizeof(modified)+2*sizeof(u32),
bad);
ceph_decode_copy(p, &fsid, sizeof(fsid));
ceph_decode_32(p, epoch);
BUG_ON(epoch != map->epoch+1);
ceph_decode_copy(p, &modified, sizeof(modified));
ceph_decode_32(p, new_flags);
/* full map? */
ceph_decode_32_safe(p, end, len, bad);
if (len > 0) {
dout("apply_incremental full map len %d, %p to %p\n",
len, *p, end);
newmap = osdmap_decode(p, min(*p+len, end));
return newmap; /* error or not */
}
/* new crush? */
ceph_decode_32_safe(p, end, len, bad);
if (len > 0) {
dout("apply_incremental new crush map len %d, %p to %p\n",
len, *p, end);
newcrush = crush_decode(*p, min(*p+len, end));
if (IS_ERR(newcrush))
return ERR_PTR(PTR_ERR(newcrush));
}
/* new flags? */
if (new_flags >= 0)
map->flags = new_flags;
ceph_decode_need(p, end, 5*sizeof(u32), bad);
/* new max? */
ceph_decode_32(p, max);
if (max >= 0) {
err = osdmap_set_max_osd(map, max);
if (err < 0)
goto bad;
}
map->epoch++;
map->modified = map->modified;
if (newcrush) {
if (map->crush)
crush_destroy(map->crush);
map->crush = newcrush;
newcrush = NULL;
}
/* new_pool */
ceph_decode_32_safe(p, end, len, bad);
while (len--) {
ceph_decode_32_safe(p, end, pool, bad);
if (pool >= map->num_pools) {
void *pg_pool = kcalloc(pool + 1,
sizeof(*map->pg_pool),
GFP_NOFS);
if (!pg_pool) {
err = -ENOMEM;
goto bad;
}
memcpy(pg_pool, map->pg_pool,
map->num_pools * sizeof(*map->pg_pool));
kfree(map->pg_pool);
map->pg_pool = pg_pool;
map->num_pools = pool+1;
}
ceph_decode_copy(p, &map->pg_pool[pool].v,
sizeof(map->pg_pool->v));
calc_pg_masks(&map->pg_pool[pool]);
}
/* old_pool (ignore) */
ceph_decode_32_safe(p, end, len, bad);
*p += len * sizeof(u32);
/* new_up */
err = -EINVAL;
ceph_decode_32_safe(p, end, len, bad);
while (len--) {
u32 osd;
struct ceph_entity_addr addr;
ceph_decode_32_safe(p, end, osd, bad);
ceph_decode_copy_safe(p, end, &addr, sizeof(addr), bad);
pr_info("osd%d up\n", osd);
BUG_ON(osd >= map->max_osd);
map->osd_state[osd] |= CEPH_OSD_UP;
map->osd_addr[osd] = addr;
}
/* new_down */
ceph_decode_32_safe(p, end, len, bad);
while (len--) {
u32 osd;
ceph_decode_32_safe(p, end, osd, bad);
(*p)++; /* clean flag */
pr_info("ceph osd%d down\n", osd);
if (osd < map->max_osd)
map->osd_state[osd] &= ~CEPH_OSD_UP;
}
/* new_weight */
ceph_decode_32_safe(p, end, len, bad);
while (len--) {
u32 osd, off;
ceph_decode_need(p, end, sizeof(u32)*2, bad);
ceph_decode_32(p, osd);
ceph_decode_32(p, off);
pr_info("osd%d weight 0x%x %s\n", osd, off,
off == CEPH_OSD_IN ? "(in)" :
(off == CEPH_OSD_OUT ? "(out)" : ""));
if (osd < map->max_osd)
map->osd_weight[osd] = off;
}
/* new_pg_temp */
rbp = rb_first(&map->pg_temp);
ceph_decode_32_safe(p, end, len, bad);
while (len--) {
struct ceph_pg_mapping *pg;
int j;
u64 pgid;
u32 pglen;
ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
ceph_decode_64(p, pgid);
ceph_decode_32(p, pglen);
/* remove any? */
while (rbp && rb_entry(rbp, struct ceph_pg_mapping,
node)->pgid <= pgid) {
struct rb_node *cur = rbp;
rbp = rb_next(rbp);
dout(" removed pg_temp %llx\n",
rb_entry(cur, struct ceph_pg_mapping, node)->pgid);
rb_erase(cur, &map->pg_temp);
}
if (pglen) {
/* insert */
ceph_decode_need(p, end, pglen*sizeof(u32), bad);
pg = kmalloc(sizeof(*pg) + sizeof(u32)*pglen, GFP_NOFS);
if (!pg) {
err = -ENOMEM;
goto bad;
}
pg->pgid = pgid;
pg->len = pglen;
for (j = 0; j < len; j++)
ceph_decode_32(p, pg->osds[j]);
__insert_pg_mapping(pg, &map->pg_temp);
dout(" added pg_temp %llx len %d\n", pgid, pglen);
}
}
while (rbp) {
struct rb_node *cur = rbp;
rbp = rb_next(rbp);
dout(" removed pg_temp %llx\n",
rb_entry(cur, struct ceph_pg_mapping, node)->pgid);
rb_erase(cur, &map->pg_temp);
}
/* ignore the rest */
*p = end;
return map;
bad:
pr_err("corrupt inc osdmap epoch %d off %d (%p of %p-%p)\n",
epoch, (int)(*p - start), *p, start, end);
if (newcrush)
crush_destroy(newcrush);
return ERR_PTR(err);
}
/*
* calculate file layout from given offset, length.
* fill in correct oid, logical length, and object extent
* offset, length.
*
* for now, we write only a single su, until we can
* pass a stride back to the caller.
*/
void ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
u64 off, u64 *plen,
u64 *bno,
u64 *oxoff, u64 *oxlen)
{
u32 osize = le32_to_cpu(layout->fl_object_size);
u32 su = le32_to_cpu(layout->fl_stripe_unit);
u32 sc = le32_to_cpu(layout->fl_stripe_count);
u32 bl, stripeno, stripepos, objsetno;
u32 su_per_object;
u64 t;
dout("mapping %llu~%llu osize %u fl_su %u\n", off, *plen,
osize, su);
su_per_object = osize / le32_to_cpu(layout->fl_stripe_unit);
dout("osize %u / su %u = su_per_object %u\n", osize, su,
su_per_object);
BUG_ON((su & ~PAGE_MASK) != 0);
/* bl = *off / su; */
t = off;
do_div(t, su);
bl = t;
dout("off %llu / su %u = bl %u\n", off, su, bl);
stripeno = bl / sc;
stripepos = bl % sc;
objsetno = stripeno / su_per_object;
*bno = objsetno * sc + stripepos;
dout("objset %u * sc %u = bno %u\n", objsetno, sc, (unsigned)*bno);
/* *oxoff = *off / layout->fl_stripe_unit; */
t = off;
*oxoff = do_div(t, su);
*oxlen = min_t(u64, *plen, su - *oxoff);
*plen = *oxlen;
dout(" obj extent %llu~%llu\n", *oxoff, *oxlen);
}
/*
* calculate an object layout (i.e. pgid) from an oid,
* file_layout, and osdmap
*/
int ceph_calc_object_layout(struct ceph_object_layout *ol,
const char *oid,
struct ceph_file_layout *fl,
struct ceph_osdmap *osdmap)
{
unsigned num, num_mask;
union ceph_pg pgid;
s32 preferred = (s32)le32_to_cpu(fl->fl_pg_preferred);
int poolid = le32_to_cpu(fl->fl_pg_pool);
struct ceph_pg_pool_info *pool;
if (poolid >= osdmap->num_pools)
return -EIO;
pool = &osdmap->pg_pool[poolid];
if (preferred >= 0) {
num = le32_to_cpu(pool->v.lpg_num);
num_mask = pool->lpg_num_mask;
} else {
num = le32_to_cpu(pool->v.pg_num);
num_mask = pool->pg_num_mask;
}
pgid.pg64 = 0; /* start with it zeroed out */
pgid.pg.ps = ceph_full_name_hash(oid, strlen(oid));
pgid.pg.preferred = preferred;
pgid.pg.pool = le32_to_cpu(fl->fl_pg_pool);
if (preferred >= 0)
dout("calc_object_layout '%s' pgid %d.%xp%d (%llx)\n", oid,
pgid.pg.pool, pgid.pg.ps, (int)preferred, pgid.pg64);
else
dout("calc_object_layout '%s' pgid %d.%x (%llx)\n", oid,
pgid.pg.pool, pgid.pg.ps, pgid.pg64);
ol->ol_pgid = cpu_to_le64(pgid.pg64);
ol->ol_stripe_unit = fl->fl_object_stripe_unit;
return 0;
}
/*
* Calculate raw osd vector for the given pgid. Return pointer to osd
* array, or NULL on failure.
*/
static int *calc_pg_raw(struct ceph_osdmap *osdmap, union ceph_pg pgid,
int *osds, int *num)
{
struct rb_node *n = osdmap->pg_temp.rb_node;
struct ceph_pg_mapping *pg;
struct ceph_pg_pool_info *pool;
int ruleno;
unsigned pps; /* placement ps */
/* pg_temp? */
while (n) {
pg = rb_entry(n, struct ceph_pg_mapping, node);
if (pgid.pg64 < pg->pgid)
n = n->rb_left;
else if (pgid.pg64 > pg->pgid)
n = n->rb_right;
else {
*num = pg->len;
return pg->osds;
}
}
/* crush */
if (pgid.pg.pool >= osdmap->num_pools)
return NULL;
pool = &osdmap->pg_pool[pgid.pg.pool];
ruleno = crush_find_rule(osdmap->crush, pool->v.crush_ruleset,
pool->v.type, pool->v.size);
if (ruleno < 0) {
pr_err("no crush rule pool %d type %d size %d\n",
pgid.pg.pool, pool->v.type, pool->v.size);
return NULL;
}
if (pgid.pg.preferred >= 0)
pps = ceph_stable_mod(pgid.pg.ps,
le32_to_cpu(pool->v.lpgp_num),
pool->lpgp_num_mask);
else
pps = ceph_stable_mod(pgid.pg.ps,
le32_to_cpu(pool->v.pgp_num),
pool->pgp_num_mask);
pps += pgid.pg.pool;
*num = crush_do_rule(osdmap->crush, ruleno, pps, osds,
min_t(int, pool->v.size, *num),
pgid.pg.preferred, osdmap->osd_weight);
return osds;
}
/*
* Return primary osd for given pgid, or -1 if none.
*/
int ceph_calc_pg_primary(struct ceph_osdmap *osdmap, union ceph_pg pgid)
{
int rawosds[10], *osds;
int i, num = ARRAY_SIZE(rawosds);
osds = calc_pg_raw(osdmap, pgid, rawosds, &num);
if (!osds)
return -1;
/* primary is first up osd */
for (i = 0; i < num; i++)
if (ceph_osd_is_up(osdmap, osds[i])) {
return osds[i];
break;
}
return -1;
}

123
fs/ceph/osdmap.h Normal file
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#ifndef _FS_CEPH_OSDMAP_H
#define _FS_CEPH_OSDMAP_H
#include <linux/rbtree.h>
#include "types.h"
#include "ceph_fs.h"
#include "crush/crush.h"
/*
* The osd map describes the current membership of the osd cluster and
* specifies the mapping of objects to placement groups and placement
* groups to (sets of) osds. That is, it completely specifies the
* (desired) distribution of all data objects in the system at some
* point in time.
*
* Each map version is identified by an epoch, which increases monotonically.
*
* The map can be updated either via an incremental map (diff) describing
* the change between two successive epochs, or as a fully encoded map.
*/
struct ceph_pg_pool_info {
struct ceph_pg_pool v;
int pg_num_mask, pgp_num_mask, lpg_num_mask, lpgp_num_mask;
};
struct ceph_pg_mapping {
struct rb_node node;
u64 pgid;
int len;
int osds[];
};
struct ceph_osdmap {
struct ceph_fsid fsid;
u32 epoch;
u32 mkfs_epoch;
struct ceph_timespec created, modified;
u32 flags; /* CEPH_OSDMAP_* */
u32 max_osd; /* size of osd_state, _offload, _addr arrays */
u8 *osd_state; /* CEPH_OSD_* */
u32 *osd_weight; /* 0 = failed, 0x10000 = 100% normal */
struct ceph_entity_addr *osd_addr;
struct rb_root pg_temp;
u32 num_pools;
struct ceph_pg_pool_info *pg_pool;
/* the CRUSH map specifies the mapping of placement groups to
* the list of osds that store+replicate them. */
struct crush_map *crush;
};
/*
* file layout helpers
*/
#define ceph_file_layout_su(l) ((__s32)le32_to_cpu((l).fl_stripe_unit))
#define ceph_file_layout_stripe_count(l) \
((__s32)le32_to_cpu((l).fl_stripe_count))
#define ceph_file_layout_object_size(l) ((__s32)le32_to_cpu((l).fl_object_size))
#define ceph_file_layout_cas_hash(l) ((__s32)le32_to_cpu((l).fl_cas_hash))
#define ceph_file_layout_object_su(l) \
((__s32)le32_to_cpu((l).fl_object_stripe_unit))
#define ceph_file_layout_pg_preferred(l) \
((__s32)le32_to_cpu((l).fl_pg_preferred))
#define ceph_file_layout_pg_pool(l) \
((__s32)le32_to_cpu((l).fl_pg_pool))
static inline unsigned ceph_file_layout_stripe_width(struct ceph_file_layout *l)
{
return le32_to_cpu(l->fl_stripe_unit) *
le32_to_cpu(l->fl_stripe_count);
}
/* "period" == bytes before i start on a new set of objects */
static inline unsigned ceph_file_layout_period(struct ceph_file_layout *l)
{
return le32_to_cpu(l->fl_object_size) *
le32_to_cpu(l->fl_stripe_count);
}
static inline int ceph_osd_is_up(struct ceph_osdmap *map, int osd)
{
return (osd < map->max_osd) && (map->osd_state[osd] & CEPH_OSD_UP);
}
static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag)
{
return map && (map->flags & flag);
}
extern char *ceph_osdmap_state_str(char *str, int len, int state);
static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map,
int osd)
{
if (osd >= map->max_osd)
return NULL;
return &map->osd_addr[osd];
}
extern struct ceph_osdmap *osdmap_decode(void **p, void *end);
extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
struct ceph_osdmap *map,
struct ceph_messenger *msgr);
extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
/* calculate mapping of a file extent to an object */
extern void ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
u64 off, u64 *plen,
u64 *bno, u64 *oxoff, u64 *oxlen);
/* calculate mapping of object to a placement group */
extern int ceph_calc_object_layout(struct ceph_object_layout *ol,
const char *oid,
struct ceph_file_layout *fl,
struct ceph_osdmap *osdmap);
extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap, union ceph_pg pgid);
#endif