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bcachefs: Ratelimiting for writeback IOs

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Writeback throttling is a kernel config option and not always enabled.
When it's not enabled we need a fallback, to avoid unbounded memory
pinning and work item backlogs.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2021-05-18 23:53:43 -04:00 committed by Kent Overstreet
parent ed34341189
commit ef1b20924b
3 changed files with 8 additions and 0 deletions
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2
fs/bcachefs/bcachefs.h
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@ -191,6 +191,7 @@
#include <linux/percpu-rwsem.h>
#include <linux/rhashtable.h>
#include <linux/rwsem.h>
#include <linux/semaphore.h>
#include <linux/seqlock.h>
#include <linux/shrinker.h>
#include <linux/srcu.h>
@ -746,6 +747,7 @@ struct bch_fs {
struct rw_semaphore gc_lock;
/* IO PATH */
struct semaphore io_in_flight;
struct bio_set bio_read;
struct bio_set bio_read_split;
struct bio_set bio_write;

4
fs/bcachefs/fs-io.c
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@ -997,6 +997,8 @@ static void bch2_writepage_io_done(struct closure *cl)
struct bio_vec *bvec;
unsigned i;
up(&io->op.c->io_in_flight);
if (io->op.error) {
set_bit(EI_INODE_ERROR, &io->inode->ei_flags);
@ -1059,6 +1061,8 @@ static void bch2_writepage_do_io(struct bch_writepage_state *w)
{
struct bch_writepage_io *io = w->io;
down(&io->op.c->io_in_flight);
w->io = NULL;
closure_call(&io->op.cl, bch2_write, NULL, &io->cl);
continue_at(&io->cl, bch2_writepage_io_done, NULL);

2
fs/bcachefs/super.c
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@ -717,6 +717,8 @@ static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
seqcount_init(&c->usage_lock);
sema_init(&c->io_in_flight, 128);
c->copy_gc_enabled = 1;
c->rebalance.enabled = 1;
c->promote_whole_extents = true;