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bcachefs: Refactor rebalance_pred function

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Before, the logic for if we should move an extent was duplicated
somewhat, in both rebalance_add_key() and rebalance_pred(); this
centralizes that in __rebalance_pred()

This is prep work for a patch that enables marking data as
incompressible.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2020-01-20 19:42:38 -05:00 committed by Kent Overstreet
parent 65d9f536fa
commit 182084e3dc
1 changed files with 44 additions and 49 deletions
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93
fs/bcachefs/rebalance.c
View file

@ -17,50 +17,51 @@
#include <linux/kthread.h>
#include <linux/sched/cputime.h>
static inline bool rebalance_ptr_pred(struct bch_fs *c,
struct extent_ptr_decoded p,
struct bch_io_opts *io_opts)
/*
* Check if an extent should be moved:
* returns -1 if it should not be moved, or
* device of pointer that should be moved, if known, or INT_MAX if unknown
*/
static int __bch2_rebalance_pred(struct bch_fs *c,
struct bkey_s_c k,
struct bch_io_opts *io_opts)
{
if (io_opts->background_target &&
!bch2_dev_in_target(c, p.ptr.dev, io_opts->background_target) &&
!p.ptr.cached)
return true;
struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
const union bch_extent_entry *entry;
struct extent_ptr_decoded p;
if (io_opts->background_compression &&
p.crc.compression_type !=
bch2_compression_opt_to_type[io_opts->background_compression])
return true;
if (io_opts->background_compression)
bkey_for_each_ptr_decode(k.k, ptrs, p, entry)
if (!p.ptr.cached &&
p.crc.compression_type !=
bch2_compression_opt_to_type[io_opts->background_compression])
return p.ptr.dev;
return false;
if (io_opts->background_target)
bkey_for_each_ptr_decode(k.k, ptrs, p, entry)
if (!p.ptr.cached &&
!bch2_dev_in_target(c, p.ptr.dev, io_opts->background_target))
return p.ptr.dev;
return -1;
}
void bch2_rebalance_add_key(struct bch_fs *c,
struct bkey_s_c k,
struct bch_io_opts *io_opts)
{
struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
const union bch_extent_entry *entry;
struct extent_ptr_decoded p;
atomic64_t *counter;
int dev;
if (!io_opts->background_target &&
!io_opts->background_compression)
dev = __bch2_rebalance_pred(c, k, io_opts);
if (dev < 0)
return;
bkey_for_each_ptr_decode(k.k, ptrs, p, entry)
if (rebalance_ptr_pred(c, p, io_opts)) {
struct bch_dev *ca = bch_dev_bkey_exists(c, p.ptr.dev);
counter = dev < INT_MAX
? &bch_dev_bkey_exists(c, dev)->rebalance_work
: &c->rebalance.work_unknown_dev;
if (atomic64_add_return(p.crc.compressed_size,
&ca->rebalance_work) ==
p.crc.compressed_size)
rebalance_wakeup(c);
}
}
void bch2_rebalance_add_work(struct bch_fs *c, u64 sectors)
{
if (atomic64_add_return(sectors, &c->rebalance.work_unknown_dev) ==
sectors)
if (atomic64_add_return(k.k->size, counter) == k.k->size)
rebalance_wakeup(c);
}
@ -69,26 +70,20 @@ static enum data_cmd rebalance_pred(struct bch_fs *c, void *arg,
struct bch_io_opts *io_opts,
struct data_opts *data_opts)
{
struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
const union bch_extent_entry *entry;
struct extent_ptr_decoded p;
unsigned nr_replicas = 0;
bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
nr_replicas += !p.ptr.cached;
if (rebalance_ptr_pred(c, p, io_opts))
goto found;
if (__bch2_rebalance_pred(c, k, io_opts) >= 0) {
data_opts->target = io_opts->background_target;
data_opts->btree_insert_flags = 0;
return DATA_ADD_REPLICAS;
} else {
return DATA_SKIP;
}
}
if (nr_replicas < io_opts->data_replicas)
goto found;
return DATA_SKIP;
found:
data_opts->target = io_opts->background_target;
data_opts->btree_insert_flags = 0;
return DATA_ADD_REPLICAS;
void bch2_rebalance_add_work(struct bch_fs *c, u64 sectors)
{
if (atomic64_add_return(sectors, &c->rebalance.work_unknown_dev) ==
sectors)
rebalance_wakeup(c);
}
struct rebalance_work {