mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
3d14c5d2b6
This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
610 lines
14 KiB
C
610 lines
14 KiB
C
|
|
#ifdef __KERNEL__
|
|
# include <linux/string.h>
|
|
# include <linux/slab.h>
|
|
# include <linux/bug.h>
|
|
# include <linux/kernel.h>
|
|
# ifndef dprintk
|
|
# define dprintk(args...)
|
|
# endif
|
|
#else
|
|
# include <string.h>
|
|
# include <stdio.h>
|
|
# include <stdlib.h>
|
|
# include <assert.h>
|
|
# define BUG_ON(x) assert(!(x))
|
|
# define dprintk(args...) /* printf(args) */
|
|
# define kmalloc(x, f) malloc(x)
|
|
# define kfree(x) free(x)
|
|
#endif
|
|
|
|
#include <linux/crush/crush.h>
|
|
#include <linux/crush/hash.h>
|
|
|
|
/*
|
|
* Implement the core CRUSH mapping algorithm.
|
|
*/
|
|
|
|
/**
|
|
* crush_find_rule - find a crush_rule id for a given ruleset, type, and size.
|
|
* @map: the crush_map
|
|
* @ruleset: the storage ruleset id (user defined)
|
|
* @type: storage ruleset type (user defined)
|
|
* @size: output set size
|
|
*/
|
|
int crush_find_rule(struct crush_map *map, int ruleset, int type, int size)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < map->max_rules; i++) {
|
|
if (map->rules[i] &&
|
|
map->rules[i]->mask.ruleset == ruleset &&
|
|
map->rules[i]->mask.type == type &&
|
|
map->rules[i]->mask.min_size <= size &&
|
|
map->rules[i]->mask.max_size >= size)
|
|
return i;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
|
|
/*
|
|
* bucket choose methods
|
|
*
|
|
* For each bucket algorithm, we have a "choose" method that, given a
|
|
* crush input @x and replica position (usually, position in output set) @r,
|
|
* will produce an item in the bucket.
|
|
*/
|
|
|
|
/*
|
|
* Choose based on a random permutation of the bucket.
|
|
*
|
|
* We used to use some prime number arithmetic to do this, but it
|
|
* wasn't very random, and had some other bad behaviors. Instead, we
|
|
* calculate an actual random permutation of the bucket members.
|
|
* Since this is expensive, we optimize for the r=0 case, which
|
|
* captures the vast majority of calls.
|
|
*/
|
|
static int bucket_perm_choose(struct crush_bucket *bucket,
|
|
int x, int r)
|
|
{
|
|
unsigned pr = r % bucket->size;
|
|
unsigned i, s;
|
|
|
|
/* start a new permutation if @x has changed */
|
|
if (bucket->perm_x != x || bucket->perm_n == 0) {
|
|
dprintk("bucket %d new x=%d\n", bucket->id, x);
|
|
bucket->perm_x = x;
|
|
|
|
/* optimize common r=0 case */
|
|
if (pr == 0) {
|
|
s = crush_hash32_3(bucket->hash, x, bucket->id, 0) %
|
|
bucket->size;
|
|
bucket->perm[0] = s;
|
|
bucket->perm_n = 0xffff; /* magic value, see below */
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < bucket->size; i++)
|
|
bucket->perm[i] = i;
|
|
bucket->perm_n = 0;
|
|
} else if (bucket->perm_n == 0xffff) {
|
|
/* clean up after the r=0 case above */
|
|
for (i = 1; i < bucket->size; i++)
|
|
bucket->perm[i] = i;
|
|
bucket->perm[bucket->perm[0]] = 0;
|
|
bucket->perm_n = 1;
|
|
}
|
|
|
|
/* calculate permutation up to pr */
|
|
for (i = 0; i < bucket->perm_n; i++)
|
|
dprintk(" perm_choose have %d: %d\n", i, bucket->perm[i]);
|
|
while (bucket->perm_n <= pr) {
|
|
unsigned p = bucket->perm_n;
|
|
/* no point in swapping the final entry */
|
|
if (p < bucket->size - 1) {
|
|
i = crush_hash32_3(bucket->hash, x, bucket->id, p) %
|
|
(bucket->size - p);
|
|
if (i) {
|
|
unsigned t = bucket->perm[p + i];
|
|
bucket->perm[p + i] = bucket->perm[p];
|
|
bucket->perm[p] = t;
|
|
}
|
|
dprintk(" perm_choose swap %d with %d\n", p, p+i);
|
|
}
|
|
bucket->perm_n++;
|
|
}
|
|
for (i = 0; i < bucket->size; i++)
|
|
dprintk(" perm_choose %d: %d\n", i, bucket->perm[i]);
|
|
|
|
s = bucket->perm[pr];
|
|
out:
|
|
dprintk(" perm_choose %d sz=%d x=%d r=%d (%d) s=%d\n", bucket->id,
|
|
bucket->size, x, r, pr, s);
|
|
return bucket->items[s];
|
|
}
|
|
|
|
/* uniform */
|
|
static int bucket_uniform_choose(struct crush_bucket_uniform *bucket,
|
|
int x, int r)
|
|
{
|
|
return bucket_perm_choose(&bucket->h, x, r);
|
|
}
|
|
|
|
/* list */
|
|
static int bucket_list_choose(struct crush_bucket_list *bucket,
|
|
int x, int r)
|
|
{
|
|
int i;
|
|
|
|
for (i = bucket->h.size-1; i >= 0; i--) {
|
|
__u64 w = crush_hash32_4(bucket->h.hash,x, bucket->h.items[i],
|
|
r, bucket->h.id);
|
|
w &= 0xffff;
|
|
dprintk("list_choose i=%d x=%d r=%d item %d weight %x "
|
|
"sw %x rand %llx",
|
|
i, x, r, bucket->h.items[i], bucket->item_weights[i],
|
|
bucket->sum_weights[i], w);
|
|
w *= bucket->sum_weights[i];
|
|
w = w >> 16;
|
|
/*dprintk(" scaled %llx\n", w);*/
|
|
if (w < bucket->item_weights[i])
|
|
return bucket->h.items[i];
|
|
}
|
|
|
|
BUG_ON(1);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* (binary) tree */
|
|
static int height(int n)
|
|
{
|
|
int h = 0;
|
|
while ((n & 1) == 0) {
|
|
h++;
|
|
n = n >> 1;
|
|
}
|
|
return h;
|
|
}
|
|
|
|
static int left(int x)
|
|
{
|
|
int h = height(x);
|
|
return x - (1 << (h-1));
|
|
}
|
|
|
|
static int right(int x)
|
|
{
|
|
int h = height(x);
|
|
return x + (1 << (h-1));
|
|
}
|
|
|
|
static int terminal(int x)
|
|
{
|
|
return x & 1;
|
|
}
|
|
|
|
static int bucket_tree_choose(struct crush_bucket_tree *bucket,
|
|
int x, int r)
|
|
{
|
|
int n, l;
|
|
__u32 w;
|
|
__u64 t;
|
|
|
|
/* start at root */
|
|
n = bucket->num_nodes >> 1;
|
|
|
|
while (!terminal(n)) {
|
|
/* pick point in [0, w) */
|
|
w = bucket->node_weights[n];
|
|
t = (__u64)crush_hash32_4(bucket->h.hash, x, n, r,
|
|
bucket->h.id) * (__u64)w;
|
|
t = t >> 32;
|
|
|
|
/* descend to the left or right? */
|
|
l = left(n);
|
|
if (t < bucket->node_weights[l])
|
|
n = l;
|
|
else
|
|
n = right(n);
|
|
}
|
|
|
|
return bucket->h.items[n >> 1];
|
|
}
|
|
|
|
|
|
/* straw */
|
|
|
|
static int bucket_straw_choose(struct crush_bucket_straw *bucket,
|
|
int x, int r)
|
|
{
|
|
int i;
|
|
int high = 0;
|
|
__u64 high_draw = 0;
|
|
__u64 draw;
|
|
|
|
for (i = 0; i < bucket->h.size; i++) {
|
|
draw = crush_hash32_3(bucket->h.hash, x, bucket->h.items[i], r);
|
|
draw &= 0xffff;
|
|
draw *= bucket->straws[i];
|
|
if (i == 0 || draw > high_draw) {
|
|
high = i;
|
|
high_draw = draw;
|
|
}
|
|
}
|
|
return bucket->h.items[high];
|
|
}
|
|
|
|
static int crush_bucket_choose(struct crush_bucket *in, int x, int r)
|
|
{
|
|
dprintk(" crush_bucket_choose %d x=%d r=%d\n", in->id, x, r);
|
|
switch (in->alg) {
|
|
case CRUSH_BUCKET_UNIFORM:
|
|
return bucket_uniform_choose((struct crush_bucket_uniform *)in,
|
|
x, r);
|
|
case CRUSH_BUCKET_LIST:
|
|
return bucket_list_choose((struct crush_bucket_list *)in,
|
|
x, r);
|
|
case CRUSH_BUCKET_TREE:
|
|
return bucket_tree_choose((struct crush_bucket_tree *)in,
|
|
x, r);
|
|
case CRUSH_BUCKET_STRAW:
|
|
return bucket_straw_choose((struct crush_bucket_straw *)in,
|
|
x, r);
|
|
default:
|
|
BUG_ON(1);
|
|
return in->items[0];
|
|
}
|
|
}
|
|
|
|
/*
|
|
* true if device is marked "out" (failed, fully offloaded)
|
|
* of the cluster
|
|
*/
|
|
static int is_out(struct crush_map *map, __u32 *weight, int item, int x)
|
|
{
|
|
if (weight[item] >= 0x10000)
|
|
return 0;
|
|
if (weight[item] == 0)
|
|
return 1;
|
|
if ((crush_hash32_2(CRUSH_HASH_RJENKINS1, x, item) & 0xffff)
|
|
< weight[item])
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* crush_choose - choose numrep distinct items of given type
|
|
* @map: the crush_map
|
|
* @bucket: the bucket we are choose an item from
|
|
* @x: crush input value
|
|
* @numrep: the number of items to choose
|
|
* @type: the type of item to choose
|
|
* @out: pointer to output vector
|
|
* @outpos: our position in that vector
|
|
* @firstn: true if choosing "first n" items, false if choosing "indep"
|
|
* @recurse_to_leaf: true if we want one device under each item of given type
|
|
* @out2: second output vector for leaf items (if @recurse_to_leaf)
|
|
*/
|
|
static int crush_choose(struct crush_map *map,
|
|
struct crush_bucket *bucket,
|
|
__u32 *weight,
|
|
int x, int numrep, int type,
|
|
int *out, int outpos,
|
|
int firstn, int recurse_to_leaf,
|
|
int *out2)
|
|
{
|
|
int rep;
|
|
int ftotal, flocal;
|
|
int retry_descent, retry_bucket, skip_rep;
|
|
struct crush_bucket *in = bucket;
|
|
int r;
|
|
int i;
|
|
int item = 0;
|
|
int itemtype;
|
|
int collide, reject;
|
|
const int orig_tries = 5; /* attempts before we fall back to search */
|
|
|
|
dprintk("CHOOSE%s bucket %d x %d outpos %d numrep %d\n", recurse_to_leaf ? "_LEAF" : "",
|
|
bucket->id, x, outpos, numrep);
|
|
|
|
for (rep = outpos; rep < numrep; rep++) {
|
|
/* keep trying until we get a non-out, non-colliding item */
|
|
ftotal = 0;
|
|
skip_rep = 0;
|
|
do {
|
|
retry_descent = 0;
|
|
in = bucket; /* initial bucket */
|
|
|
|
/* choose through intervening buckets */
|
|
flocal = 0;
|
|
do {
|
|
collide = 0;
|
|
retry_bucket = 0;
|
|
r = rep;
|
|
if (in->alg == CRUSH_BUCKET_UNIFORM) {
|
|
/* be careful */
|
|
if (firstn || numrep >= in->size)
|
|
/* r' = r + f_total */
|
|
r += ftotal;
|
|
else if (in->size % numrep == 0)
|
|
/* r'=r+(n+1)*f_local */
|
|
r += (numrep+1) *
|
|
(flocal+ftotal);
|
|
else
|
|
/* r' = r + n*f_local */
|
|
r += numrep * (flocal+ftotal);
|
|
} else {
|
|
if (firstn)
|
|
/* r' = r + f_total */
|
|
r += ftotal;
|
|
else
|
|
/* r' = r + n*f_local */
|
|
r += numrep * (flocal+ftotal);
|
|
}
|
|
|
|
/* bucket choose */
|
|
if (in->size == 0) {
|
|
reject = 1;
|
|
goto reject;
|
|
}
|
|
if (flocal >= (in->size>>1) &&
|
|
flocal > orig_tries)
|
|
item = bucket_perm_choose(in, x, r);
|
|
else
|
|
item = crush_bucket_choose(in, x, r);
|
|
BUG_ON(item >= map->max_devices);
|
|
|
|
/* desired type? */
|
|
if (item < 0)
|
|
itemtype = map->buckets[-1-item]->type;
|
|
else
|
|
itemtype = 0;
|
|
dprintk(" item %d type %d\n", item, itemtype);
|
|
|
|
/* keep going? */
|
|
if (itemtype != type) {
|
|
BUG_ON(item >= 0 ||
|
|
(-1-item) >= map->max_buckets);
|
|
in = map->buckets[-1-item];
|
|
retry_bucket = 1;
|
|
continue;
|
|
}
|
|
|
|
/* collision? */
|
|
for (i = 0; i < outpos; i++) {
|
|
if (out[i] == item) {
|
|
collide = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
reject = 0;
|
|
if (recurse_to_leaf) {
|
|
if (item < 0) {
|
|
if (crush_choose(map,
|
|
map->buckets[-1-item],
|
|
weight,
|
|
x, outpos+1, 0,
|
|
out2, outpos,
|
|
firstn, 0,
|
|
NULL) <= outpos)
|
|
/* didn't get leaf */
|
|
reject = 1;
|
|
} else {
|
|
/* we already have a leaf! */
|
|
out2[outpos] = item;
|
|
}
|
|
}
|
|
|
|
if (!reject) {
|
|
/* out? */
|
|
if (itemtype == 0)
|
|
reject = is_out(map, weight,
|
|
item, x);
|
|
else
|
|
reject = 0;
|
|
}
|
|
|
|
reject:
|
|
if (reject || collide) {
|
|
ftotal++;
|
|
flocal++;
|
|
|
|
if (collide && flocal < 3)
|
|
/* retry locally a few times */
|
|
retry_bucket = 1;
|
|
else if (flocal < in->size + orig_tries)
|
|
/* exhaustive bucket search */
|
|
retry_bucket = 1;
|
|
else if (ftotal < 20)
|
|
/* then retry descent */
|
|
retry_descent = 1;
|
|
else
|
|
/* else give up */
|
|
skip_rep = 1;
|
|
dprintk(" reject %d collide %d "
|
|
"ftotal %d flocal %d\n",
|
|
reject, collide, ftotal,
|
|
flocal);
|
|
}
|
|
} while (retry_bucket);
|
|
} while (retry_descent);
|
|
|
|
if (skip_rep) {
|
|
dprintk("skip rep\n");
|
|
continue;
|
|
}
|
|
|
|
dprintk("CHOOSE got %d\n", item);
|
|
out[outpos] = item;
|
|
outpos++;
|
|
}
|
|
|
|
dprintk("CHOOSE returns %d\n", outpos);
|
|
return outpos;
|
|
}
|
|
|
|
|
|
/**
|
|
* crush_do_rule - calculate a mapping with the given input and rule
|
|
* @map: the crush_map
|
|
* @ruleno: the rule id
|
|
* @x: hash input
|
|
* @result: pointer to result vector
|
|
* @result_max: maximum result size
|
|
* @force: force initial replica choice; -1 for none
|
|
*/
|
|
int crush_do_rule(struct crush_map *map,
|
|
int ruleno, int x, int *result, int result_max,
|
|
int force, __u32 *weight)
|
|
{
|
|
int result_len;
|
|
int force_context[CRUSH_MAX_DEPTH];
|
|
int force_pos = -1;
|
|
int a[CRUSH_MAX_SET];
|
|
int b[CRUSH_MAX_SET];
|
|
int c[CRUSH_MAX_SET];
|
|
int recurse_to_leaf;
|
|
int *w;
|
|
int wsize = 0;
|
|
int *o;
|
|
int osize;
|
|
int *tmp;
|
|
struct crush_rule *rule;
|
|
int step;
|
|
int i, j;
|
|
int numrep;
|
|
int firstn;
|
|
int rc = -1;
|
|
|
|
BUG_ON(ruleno >= map->max_rules);
|
|
|
|
rule = map->rules[ruleno];
|
|
result_len = 0;
|
|
w = a;
|
|
o = b;
|
|
|
|
/*
|
|
* determine hierarchical context of force, if any. note
|
|
* that this may or may not correspond to the specific types
|
|
* referenced by the crush rule.
|
|
*/
|
|
if (force >= 0) {
|
|
if (force >= map->max_devices ||
|
|
map->device_parents[force] == 0) {
|
|
/*dprintk("CRUSH: forcefed device dne\n");*/
|
|
rc = -1; /* force fed device dne */
|
|
goto out;
|
|
}
|
|
if (!is_out(map, weight, force, x)) {
|
|
while (1) {
|
|
force_context[++force_pos] = force;
|
|
if (force >= 0)
|
|
force = map->device_parents[force];
|
|
else
|
|
force = map->bucket_parents[-1-force];
|
|
if (force == 0)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (step = 0; step < rule->len; step++) {
|
|
firstn = 0;
|
|
switch (rule->steps[step].op) {
|
|
case CRUSH_RULE_TAKE:
|
|
w[0] = rule->steps[step].arg1;
|
|
if (force_pos >= 0) {
|
|
BUG_ON(force_context[force_pos] != w[0]);
|
|
force_pos--;
|
|
}
|
|
wsize = 1;
|
|
break;
|
|
|
|
case CRUSH_RULE_CHOOSE_LEAF_FIRSTN:
|
|
case CRUSH_RULE_CHOOSE_FIRSTN:
|
|
firstn = 1;
|
|
case CRUSH_RULE_CHOOSE_LEAF_INDEP:
|
|
case CRUSH_RULE_CHOOSE_INDEP:
|
|
BUG_ON(wsize == 0);
|
|
|
|
recurse_to_leaf =
|
|
rule->steps[step].op ==
|
|
CRUSH_RULE_CHOOSE_LEAF_FIRSTN ||
|
|
rule->steps[step].op ==
|
|
CRUSH_RULE_CHOOSE_LEAF_INDEP;
|
|
|
|
/* reset output */
|
|
osize = 0;
|
|
|
|
for (i = 0; i < wsize; i++) {
|
|
/*
|
|
* see CRUSH_N, CRUSH_N_MINUS macros.
|
|
* basically, numrep <= 0 means relative to
|
|
* the provided result_max
|
|
*/
|
|
numrep = rule->steps[step].arg1;
|
|
if (numrep <= 0) {
|
|
numrep += result_max;
|
|
if (numrep <= 0)
|
|
continue;
|
|
}
|
|
j = 0;
|
|
if (osize == 0 && force_pos >= 0) {
|
|
/* skip any intermediate types */
|
|
while (force_pos &&
|
|
force_context[force_pos] < 0 &&
|
|
rule->steps[step].arg2 !=
|
|
map->buckets[-1 -
|
|
force_context[force_pos]]->type)
|
|
force_pos--;
|
|
o[osize] = force_context[force_pos];
|
|
if (recurse_to_leaf)
|
|
c[osize] = force_context[0];
|
|
j++;
|
|
force_pos--;
|
|
}
|
|
osize += crush_choose(map,
|
|
map->buckets[-1-w[i]],
|
|
weight,
|
|
x, numrep,
|
|
rule->steps[step].arg2,
|
|
o+osize, j,
|
|
firstn,
|
|
recurse_to_leaf, c+osize);
|
|
}
|
|
|
|
if (recurse_to_leaf)
|
|
/* copy final _leaf_ values to output set */
|
|
memcpy(o, c, osize*sizeof(*o));
|
|
|
|
/* swap t and w arrays */
|
|
tmp = o;
|
|
o = w;
|
|
w = tmp;
|
|
wsize = osize;
|
|
break;
|
|
|
|
|
|
case CRUSH_RULE_EMIT:
|
|
for (i = 0; i < wsize && result_len < result_max; i++) {
|
|
result[result_len] = w[i];
|
|
result_len++;
|
|
}
|
|
wsize = 0;
|
|
break;
|
|
|
|
default:
|
|
BUG_ON(1);
|
|
}
|
|
}
|
|
rc = result_len;
|
|
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
|