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OpenCloudOS-Kernel/fs/ceph/osdmap.c

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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);
b->item_weight = ceph_decode_32(p);
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++) {
b->item_weights[j] = ceph_decode_32(p);
b->sum_weights[j] = ceph_decode_32(p);
}
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++)
b->node_weights[j] = ceph_decode_32(p);
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++) {
b->item_weights[j] = ceph_decode_32(p);
b->straws[j] = ceph_decode_32(p);
}
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);
magic = ceph_decode_32(p);
if (magic != CRUSH_MAGIC) {
pr_err("crush_decode magic %x != current %x\n",
(unsigned)magic, (unsigned)CRUSH_MAGIC);
goto bad;
}
c->max_buckets = ceph_decode_32(p);
c->max_rules = ceph_decode_32(p);
c->max_devices = ceph_decode_32(p);
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);
b->id = ceph_decode_32(p);
b->type = ceph_decode_16(p);
b->alg = ceph_decode_8(p);
b->hash = ceph_decode_8(p);
b->weight = ceph_decode_32(p);
b->size = ceph_decode_32(p);
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++)
b->items[j] = ceph_decode_32(p);
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++) {
r->steps[j].op = ceph_decode_32(p);
r->steps[j].arg1 = ceph_decode_32(p);
r->steps[j].arg2 = ceph_decode_32(p);
}
}
/* 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 int pgid_cmp(struct ceph_pg l, struct ceph_pg r)
{
u64 a = *(u64 *)&l;
u64 b = *(u64 *)&r;
if (a < b)
return -1;
if (a > b)
return 1;
return 0;
}
static int __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;
int c;
while (*p) {
parent = *p;
pg = rb_entry(parent, struct ceph_pg_mapping, node);
c = pgid_cmp(new->pgid, pg->pgid);
if (c < 0)
p = &(*p)->rb_left;
else if (c > 0)
p = &(*p)->rb_right;
else
return -EEXIST;
}
rb_link_node(&new->node, parent, p);
rb_insert_color(&new->node, root);
return 0;
}
/*
* 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));
map->epoch = ceph_decode_32(p);
ceph_decode_copy(p, &map->created, sizeof(map->created));
ceph_decode_copy(p, &map->modified, sizeof(map->modified));
map->num_pools = ceph_decode_32(p);
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);
i = ceph_decode_32(p);
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);
max = ceph_decode_32(p);
/* (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++)
map->osd_weight[i] = ceph_decode_32(p);
*p += 4; /* skip length field (should match max) */
ceph_decode_copy(p, map->osd_addr, map->max_osd*sizeof(*map->osd_addr));
for (i = 0; i < map->max_osd; i++)
ceph_decode_addr(&map->osd_addr[i]);
/* pg_temp */
ceph_decode_32_safe(p, end, len, bad);
for (i = 0; i < len; i++) {
int n, j;
struct ceph_pg pgid;
struct ceph_pg_mapping *pg;
ceph_decode_need(p, end, sizeof(u32) + sizeof(u64), bad);
ceph_decode_copy(p, &pgid, sizeof(pgid));
n = ceph_decode_32(p);
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++)
pg->osds[j] = ceph_decode_32(p);
err = __insert_pg_mapping(pg, &map->pg_temp);
if (err)
goto bad;
dout(" added pg_temp %llx len %d\n", *(u64 *)&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));
epoch = ceph_decode_32(p);
BUG_ON(epoch != map->epoch+1);
ceph_decode_copy(p, &modified, sizeof(modified));
new_flags = ceph_decode_32(p);
/* 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? */
max = ceph_decode_32(p);
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);
ceph_decode_addr(&addr);
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("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);
osd = ceph_decode_32(p);
off = ceph_decode_32(p);
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;
struct ceph_pg pgid;
u32 pglen;
ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
ceph_decode_copy(p, &pgid, sizeof(pgid));
pglen = ceph_decode_32(p);
/* remove any? */
while (rbp && pgid_cmp(rb_entry(rbp, struct ceph_pg_mapping,
node)->pgid, pgid) <= 0) {
struct rb_node *cur = rbp;
rbp = rb_next(rbp);
dout(" removed pg_temp %llx\n",
*(u64 *)&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++)
pg->osds[j] = ceph_decode_32(p);
err = __insert_pg_mapping(pg, &map->pg_temp);
if (err)
goto bad;
dout(" added pg_temp %llx len %d\n", *(u64 *)&pgid,
pglen);
}
}
while (rbp) {
struct rb_node *cur = rbp;
rbp = rb_next(rbp);
dout(" removed pg_temp %llx\n",
*(u64 *)&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 *ono,
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, su_offset;
dout("mapping %llu~%llu osize %u fl_su %u\n", off, *plen,
osize, su);
su_per_object = osize / su;
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;
*ono = objsetno * sc + stripepos;
dout("objset %u * sc %u = ono %u\n", objsetno, sc, (unsigned)*ono);
/* *oxoff = *off % layout->fl_stripe_unit; # offset in su */
t = off;
su_offset = do_div(t, su);
*oxoff = su_offset + (stripeno % su_per_object) * su;
/*
* Calculate the length of the extent being written to the selected
* object. This is the minimum of the full length requested (plen) or
* the remainder of the current stripe being written to.
*/
*oxlen = min_t(u64, *plen, su - su_offset);
*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;
struct 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;
unsigned ps;
if (poolid >= osdmap->num_pools)
return -EIO;
pool = &osdmap->pg_pool[poolid];
ps = ceph_str_hash(pool->v.object_hash, oid, strlen(oid));
if (preferred >= 0) {
ps += preferred;
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.ps = cpu_to_le16(ps);
pgid.preferred = cpu_to_le16(preferred);
pgid.pool = fl->fl_pg_pool;
if (preferred >= 0)
dout("calc_object_layout '%s' pgid %d.%xp%d\n", oid, poolid, ps,
(int)preferred);
else
dout("calc_object_layout '%s' pgid %d.%x\n", oid, poolid, ps);
ol->ol_pgid = pgid;
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, struct 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 poolid, ps, pps;
int preferred;
int c;
/* pg_temp? */
while (n) {
pg = rb_entry(n, struct ceph_pg_mapping, node);
c = pgid_cmp(pgid, pg->pgid);
if (c < 0)
n = n->rb_left;
else if (c > 0)
n = n->rb_right;
else {
*num = pg->len;
return pg->osds;
}
}
/* crush */
poolid = le32_to_cpu(pgid.pool);
ps = le16_to_cpu(pgid.ps);
preferred = (s16)le16_to_cpu(pgid.preferred);
if (poolid >= osdmap->num_pools)
return NULL;
pool = &osdmap->pg_pool[poolid];
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",
poolid, pool->v.type, pool->v.size);
return NULL;
}
if (preferred >= 0)
pps = ceph_stable_mod(ps,
le32_to_cpu(pool->v.lpgp_num),
pool->lpgp_num_mask);
else
pps = ceph_stable_mod(ps,
le32_to_cpu(pool->v.pgp_num),
pool->pgp_num_mask);
pps += poolid;
*num = crush_do_rule(osdmap->crush, ruleno, pps, osds,
min_t(int, pool->v.size, *num),
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, struct 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;
}
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