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bcache: Convert bch_btree_read_async() to bch_btree_map_keys()
This is a fairly straightforward conversion, mostly reshuffling - op->lookup_done goes away, replaced by MAP_DONE/MAP_CONTINUE. And the code for handling cache hits and misses wasn't really btree code, so it gets moved to request.c. Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet
parent
df8e89701f
commit
2c1953e201
@ -23,7 +23,6 @@
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#include "bcache.h"
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#include "btree.h"
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#include "debug.h"
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#include "request.h"
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#include "writeback.h"
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#include <linux/slab.h>
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@ -2255,138 +2254,6 @@ void bch_btree_set_root(struct btree *b)
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closure_sync(&cl);
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}
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/* Cache lookup */
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static int submit_partial_cache_miss(struct btree *b, struct btree_op *op,
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struct bkey *k)
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{
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struct search *s = container_of(op, struct search, op);
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struct bio *bio = &s->bio.bio;
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int ret = 0;
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while (!ret &&
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!op->lookup_done) {
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unsigned sectors = INT_MAX;
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if (KEY_INODE(k) == op->inode) {
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if (KEY_START(k) <= bio->bi_sector)
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break;
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sectors = min_t(uint64_t, sectors,
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KEY_START(k) - bio->bi_sector);
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}
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ret = s->d->cache_miss(b, s, bio, sectors);
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}
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return ret;
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}
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/*
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* Read from a single key, handling the initial cache miss if the key starts in
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* the middle of the bio
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*/
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static int submit_partial_cache_hit(struct btree *b, struct btree_op *op,
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struct bkey *k)
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{
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struct search *s = container_of(op, struct search, op);
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struct bio *bio = &s->bio.bio;
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unsigned ptr;
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struct bio *n;
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int ret = submit_partial_cache_miss(b, op, k);
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if (ret || op->lookup_done)
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return ret;
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/* XXX: figure out best pointer - for multiple cache devices */
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ptr = 0;
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PTR_BUCKET(b->c, k, ptr)->prio = INITIAL_PRIO;
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while (!op->lookup_done &&
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KEY_INODE(k) == op->inode &&
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bio->bi_sector < KEY_OFFSET(k)) {
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struct bkey *bio_key;
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sector_t sector = PTR_OFFSET(k, ptr) +
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(bio->bi_sector - KEY_START(k));
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unsigned sectors = min_t(uint64_t, INT_MAX,
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KEY_OFFSET(k) - bio->bi_sector);
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n = bch_bio_split(bio, sectors, GFP_NOIO, s->d->bio_split);
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if (n == bio)
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op->lookup_done = true;
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bio_key = &container_of(n, struct bbio, bio)->key;
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/*
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* The bucket we're reading from might be reused while our bio
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* is in flight, and we could then end up reading the wrong
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* data.
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*
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* We guard against this by checking (in cache_read_endio()) if
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* the pointer is stale again; if so, we treat it as an error
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* and reread from the backing device (but we don't pass that
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* error up anywhere).
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*/
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bch_bkey_copy_single_ptr(bio_key, k, ptr);
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SET_PTR_OFFSET(bio_key, 0, sector);
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n->bi_end_io = bch_cache_read_endio;
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n->bi_private = &s->cl;
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__bch_submit_bbio(n, b->c);
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}
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return 0;
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}
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static int bch_btree_search_recurse(struct btree *b, struct btree_op *op)
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{
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struct search *s = container_of(op, struct search, op);
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struct bio *bio = &s->bio.bio;
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int ret = 0;
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struct bkey *k;
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struct btree_iter iter;
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bch_btree_iter_init(b, &iter, &KEY(op->inode, bio->bi_sector, 0));
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do {
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k = bch_btree_iter_next_filter(&iter, b, bch_ptr_bad);
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if (!k) {
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/*
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* b->key would be exactly what we want, except that
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* pointers to btree nodes have nonzero size - we
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* wouldn't go far enough
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*/
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ret = submit_partial_cache_miss(b, op,
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&KEY(KEY_INODE(&b->key),
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KEY_OFFSET(&b->key), 0));
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break;
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}
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ret = b->level
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? btree(search_recurse, k, b, op)
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: submit_partial_cache_hit(b, op, k);
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} while (!ret &&
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!op->lookup_done);
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return ret;
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}
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void bch_btree_search_async(struct closure *cl)
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{
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struct btree_op *op = container_of(cl, struct btree_op, cl);
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int ret = btree_root(search_recurse, op->c, op);
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if (ret == -EAGAIN)
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continue_at(cl, bch_btree_search_async, bcache_wq);
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closure_return(cl);
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}
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/* Map across nodes or keys */
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static int bch_btree_map_nodes_recurse(struct btree *b, struct btree_op *op,
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@ -264,7 +264,6 @@ struct btree_op {
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unsigned flush_journal:1;
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unsigned insert_data_done:1;
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unsigned lookup_done:1;
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unsigned insert_collision:1;
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BKEY_PADDED(replace);
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@ -306,8 +305,6 @@ int bch_btree_insert_check_key(struct btree *, struct btree_op *,
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struct bkey *);
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int bch_btree_insert(struct btree_op *, struct cache_set *, struct keylist *);
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void bch_btree_search_async(struct closure *);
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int bch_gc_thread_start(struct cache_set *);
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size_t bch_btree_gc_finish(struct cache_set *);
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void bch_moving_gc(struct cache_set *);
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@ -7,7 +7,6 @@
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#include "bcache.h"
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#include "btree.h"
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#include "debug.h"
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#include "request.h"
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#include <trace/events/bcache.h>
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@ -638,24 +638,9 @@ void bch_data_insert(struct closure *cl)
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bch_data_insert_start(cl);
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}
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/* Common code for the make_request functions */
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/* Cache lookup */
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static void request_endio(struct bio *bio, int error)
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{
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struct closure *cl = bio->bi_private;
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if (error) {
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struct search *s = container_of(cl, struct search, cl);
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s->error = error;
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/* Only cache read errors are recoverable */
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s->recoverable = false;
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}
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bio_put(bio);
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closure_put(cl);
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}
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void bch_cache_read_endio(struct bio *bio, int error)
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static void bch_cache_read_endio(struct bio *bio, int error)
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{
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struct bbio *b = container_of(bio, struct bbio, bio);
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struct closure *cl = bio->bi_private;
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@ -678,6 +663,120 @@ void bch_cache_read_endio(struct bio *bio, int error)
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bch_bbio_endio(s->op.c, bio, error, "reading from cache");
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}
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static int submit_partial_cache_miss(struct btree *b, struct search *s,
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struct bkey *k)
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{
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struct bio *bio = &s->bio.bio;
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int ret = MAP_CONTINUE;
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do {
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unsigned sectors = INT_MAX;
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if (KEY_INODE(k) == s->op.inode) {
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if (KEY_START(k) <= bio->bi_sector)
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break;
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sectors = min_t(uint64_t, sectors,
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KEY_START(k) - bio->bi_sector);
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}
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ret = s->d->cache_miss(b, s, bio, sectors);
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} while (ret == MAP_CONTINUE);
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return ret;
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}
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/*
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* Read from a single key, handling the initial cache miss if the key starts in
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* the middle of the bio
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*/
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static int submit_partial_cache_hit(struct btree_op *op, struct btree *b,
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struct bkey *k)
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{
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struct search *s = container_of(op, struct search, op);
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struct bio *bio = &s->bio.bio;
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unsigned ptr;
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struct bio *n;
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int ret = submit_partial_cache_miss(b, s, k);
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if (ret != MAP_CONTINUE || !KEY_SIZE(k))
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return ret;
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/* XXX: figure out best pointer - for multiple cache devices */
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ptr = 0;
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PTR_BUCKET(b->c, k, ptr)->prio = INITIAL_PRIO;
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while (ret == MAP_CONTINUE &&
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KEY_INODE(k) == op->inode &&
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bio->bi_sector < KEY_OFFSET(k)) {
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struct bkey *bio_key;
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sector_t sector = PTR_OFFSET(k, ptr) +
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(bio->bi_sector - KEY_START(k));
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unsigned sectors = min_t(uint64_t, INT_MAX,
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KEY_OFFSET(k) - bio->bi_sector);
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n = bch_bio_split(bio, sectors, GFP_NOIO, s->d->bio_split);
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if (n == bio)
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ret = MAP_DONE;
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bio_key = &container_of(n, struct bbio, bio)->key;
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/*
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* The bucket we're reading from might be reused while our bio
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* is in flight, and we could then end up reading the wrong
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* data.
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*
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* We guard against this by checking (in cache_read_endio()) if
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* the pointer is stale again; if so, we treat it as an error
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* and reread from the backing device (but we don't pass that
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* error up anywhere).
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*/
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bch_bkey_copy_single_ptr(bio_key, k, ptr);
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SET_PTR_OFFSET(bio_key, 0, sector);
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n->bi_end_io = bch_cache_read_endio;
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n->bi_private = &s->cl;
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__bch_submit_bbio(n, b->c);
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}
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return ret;
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}
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static void cache_lookup(struct closure *cl)
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{
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struct btree_op *op = container_of(cl, struct btree_op, cl);
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struct search *s = container_of(op, struct search, op);
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struct bio *bio = &s->bio.bio;
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int ret = bch_btree_map_keys(op, op->c,
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&KEY(op->inode, bio->bi_sector, 0),
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submit_partial_cache_hit, 1);
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if (ret == -EAGAIN)
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continue_at(cl, cache_lookup, bcache_wq);
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closure_return(cl);
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}
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/* Common code for the make_request functions */
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static void request_endio(struct bio *bio, int error)
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{
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struct closure *cl = bio->bi_private;
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if (error) {
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struct search *s = container_of(cl, struct search, cl);
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s->error = error;
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/* Only cache read errors are recoverable */
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s->recoverable = false;
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}
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bio_put(bio);
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closure_put(cl);
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}
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static void bio_complete(struct search *s)
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{
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if (s->orig_bio) {
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@ -1005,15 +1104,14 @@ static void cached_dev_read_done_bh(struct closure *cl)
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static int cached_dev_cache_miss(struct btree *b, struct search *s,
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struct bio *bio, unsigned sectors)
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{
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int ret = 0;
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int ret = MAP_CONTINUE;
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unsigned reada = 0;
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struct cached_dev *dc = container_of(s->d, struct cached_dev, disk);
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struct bio *miss, *cache_bio;
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if (s->cache_miss || s->op.bypass) {
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miss = bch_bio_split(bio, sectors, GFP_NOIO, s->d->bio_split);
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if (miss == bio)
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s->op.lookup_done = true;
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ret = miss == bio ? MAP_DONE : MAP_CONTINUE;
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goto out_submit;
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}
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@ -1033,11 +1131,9 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
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return ret;
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miss = bch_bio_split(bio, sectors, GFP_NOIO, s->d->bio_split);
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if (miss == bio)
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s->op.lookup_done = true;
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else
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/* btree_search_recurse()'s btree iterator is no good anymore */
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ret = -EINTR;
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/* btree_search_recurse()'s btree iterator is no good anymore */
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ret = miss == bio ? MAP_DONE : -EINTR;
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cache_bio = bio_alloc_bioset(GFP_NOWAIT,
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DIV_ROUND_UP(s->cache_bio_sectors, PAGE_SECTORS),
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@ -1075,7 +1171,7 @@ static void cached_dev_read(struct cached_dev *dc, struct search *s)
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{
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struct closure *cl = &s->cl;
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closure_call(&s->op.cl, bch_btree_search_async, NULL, cl);
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closure_call(&s->op.cl, cache_lookup, NULL, cl);
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continue_at(cl, cached_dev_read_done_bh, NULL);
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}
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@ -1287,9 +1383,9 @@ static int flash_dev_cache_miss(struct btree *b, struct search *s,
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bio_advance(bio, min(sectors << 9, bio->bi_size));
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if (!bio->bi_size)
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s->op.lookup_done = true;
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return MAP_DONE;
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return 0;
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return MAP_CONTINUE;
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}
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static void flash_dev_nodata(struct closure *cl)
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@ -1339,7 +1435,7 @@ static void flash_dev_make_request(struct request_queue *q, struct bio *bio)
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closure_call(&s->op.cl, bch_data_insert, NULL, cl);
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} else {
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closure_call(&s->op.cl, bch_btree_search_async, NULL, cl);
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closure_call(&s->op.cl, cache_lookup, NULL, cl);
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}
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continue_at(cl, search_free, NULL);
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@ -31,10 +31,8 @@ struct search {
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struct keylist insert_keys;
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};
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void bch_cache_read_endio(struct bio *, int);
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unsigned bch_get_congested(struct cache_set *);
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void bch_data_insert(struct closure *cl);
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void bch_cache_read_endio(struct bio *, int);
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void bch_open_buckets_free(struct cache_set *);
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int bch_open_buckets_alloc(struct cache_set *);
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