diff options
author | Kent Overstreet <kmo@daterainc.com> | 2013-11-11 17:02:31 -0800 |
---|---|---|
committer | Kent Overstreet <kmo@daterainc.com> | 2014-01-08 13:05:14 -0800 |
commit | 829a60b9055c319f3656a01eb8cb78b1b86232ef (patch) | |
tree | d6e709a97b9fc3274ef8de84cb52c2e3e0078807 /drivers | |
parent | 89ebb4a28ba9efb5c9b18ba552e784021957b14a (diff) | |
download | linux-829a60b9055c319f3656a01eb8cb78b1b86232ef.tar.bz2 |
bcache: Move insert_fixup() to btree_keys_ops
Now handling overlapping extents/keys is a method that's specific to what the
btree node contains.
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/md/bcache/bset.c | 50 | ||||
-rw-r--r-- | drivers/md/bcache/bset.h | 12 | ||||
-rw-r--r-- | drivers/md/bcache/btree.c | 246 | ||||
-rw-r--r-- | drivers/md/bcache/extents.c | 178 |
4 files changed, 257 insertions, 229 deletions
diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c index 2ff75f3199fa..4a7113236034 100644 --- a/drivers/md/bcache/bset.c +++ b/drivers/md/bcache/bset.c @@ -676,6 +676,8 @@ void bch_bset_build_written_tree(struct btree_keys *b) } EXPORT_SYMBOL(bch_bset_build_written_tree); +/* Insert */ + void bch_bset_fix_invalidated_key(struct btree_keys *b, struct bkey *k) { struct bset_tree *t; @@ -791,6 +793,54 @@ void bch_bset_insert(struct btree_keys *b, struct bkey *where, } EXPORT_SYMBOL(bch_bset_insert); +unsigned bch_btree_insert_key(struct btree_keys *b, struct bkey *k, + struct bkey *replace_key) +{ + unsigned status = BTREE_INSERT_STATUS_NO_INSERT; + struct bset *i = bset_tree_last(b)->data; + struct bkey *m, *prev = NULL; + struct btree_iter iter; + + BUG_ON(b->ops->is_extents && !KEY_SIZE(k)); + + m = bch_btree_iter_init(b, &iter, b->ops->is_extents + ? PRECEDING_KEY(&START_KEY(k)) + : PRECEDING_KEY(k)); + + if (b->ops->insert_fixup(b, k, &iter, replace_key)) + return status; + + status = BTREE_INSERT_STATUS_INSERT; + + while (m != bset_bkey_last(i) && + bkey_cmp(k, b->ops->is_extents ? &START_KEY(m) : m) > 0) + prev = m, m = bkey_next(m); + + /* prev is in the tree, if we merge we're done */ + status = BTREE_INSERT_STATUS_BACK_MERGE; + if (prev && + bch_bkey_try_merge(b, prev, k)) + goto merged; +#if 0 + status = BTREE_INSERT_STATUS_OVERWROTE; + if (m != bset_bkey_last(i) && + KEY_PTRS(m) == KEY_PTRS(k) && !KEY_SIZE(m)) + goto copy; +#endif + status = BTREE_INSERT_STATUS_FRONT_MERGE; + if (m != bset_bkey_last(i) && + bch_bkey_try_merge(b, k, m)) + goto copy; + + bch_bset_insert(b, m, k); +copy: bkey_copy(m, k); +merged: + return status; +} +EXPORT_SYMBOL(bch_btree_insert_key); + +/* Lookup */ + struct bset_search_iter { struct bkey *l, *r; }; diff --git a/drivers/md/bcache/bset.h b/drivers/md/bcache/bset.h index 4aa199d03344..759df830bb14 100644 --- a/drivers/md/bcache/bset.h +++ b/drivers/md/bcache/bset.h @@ -189,6 +189,8 @@ struct btree_keys_ops { bool (*sort_cmp)(struct btree_iter_set, struct btree_iter_set); struct bkey *(*sort_fixup)(struct btree_iter *, struct bkey *); + bool (*insert_fixup)(struct btree_keys *, struct bkey *, + struct btree_iter *, struct bkey *); bool (*key_invalid)(struct btree_keys *, const struct bkey *); bool (*key_bad)(struct btree_keys *, const struct bkey *); @@ -286,6 +288,16 @@ void bch_bset_init_next(struct btree_keys *, struct bset *, uint64_t); void bch_bset_build_written_tree(struct btree_keys *); void bch_bset_fix_invalidated_key(struct btree_keys *, struct bkey *); void bch_bset_insert(struct btree_keys *, struct bkey *, struct bkey *); +unsigned bch_btree_insert_key(struct btree_keys *, struct bkey *, + struct bkey *); + +enum { + BTREE_INSERT_STATUS_NO_INSERT = 0, + BTREE_INSERT_STATUS_INSERT, + BTREE_INSERT_STATUS_BACK_MERGE, + BTREE_INSERT_STATUS_OVERWROTE, + BTREE_INSERT_STATUS_FRONT_MERGE, +}; /* * Tries to merge l and r: l should be lower than r diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index b14f34aa927d..463d2800a955 100644 --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -24,7 +24,6 @@ #include "btree.h" #include "debug.h" #include "extents.h" -#include "writeback.h" #include <linux/slab.h> #include <linux/bitops.h> @@ -90,13 +89,6 @@ * Test module load/unload */ -enum { - BTREE_INSERT_STATUS_INSERT, - BTREE_INSERT_STATUS_BACK_MERGE, - BTREE_INSERT_STATUS_OVERWROTE, - BTREE_INSERT_STATUS_FRONT_MERGE, -}; - #define MAX_NEED_GC 64 #define MAX_SAVE_PRIO 72 @@ -1792,230 +1784,23 @@ err: /* Btree insertion */ -static bool fix_overlapping_extents(struct btree *b, struct bkey *insert, - struct btree_iter *iter, - struct bkey *replace_key) +static bool btree_insert_key(struct btree *b, struct bkey *k, + struct bkey *replace_key) { - void subtract_dirty(struct bkey *k, uint64_t offset, int sectors) - { - if (KEY_DIRTY(k)) - bcache_dev_sectors_dirty_add(b->c, KEY_INODE(k), - offset, -sectors); - } - - uint64_t old_offset; - unsigned old_size, sectors_found = 0; - - while (1) { - struct bkey *k = bch_btree_iter_next(iter); - if (!k) - break; - - if (bkey_cmp(&START_KEY(k), insert) >= 0) { - if (KEY_SIZE(k)) - break; - else - continue; - } - - if (bkey_cmp(k, &START_KEY(insert)) <= 0) - continue; - - old_offset = KEY_START(k); - old_size = KEY_SIZE(k); - - /* - * We might overlap with 0 size extents; we can't skip these - * because if they're in the set we're inserting to we have to - * adjust them so they don't overlap with the key we're - * inserting. But we don't want to check them for replace - * operations. - */ - - if (replace_key && KEY_SIZE(k)) { - /* - * k might have been split since we inserted/found the - * key we're replacing - */ - unsigned i; - uint64_t offset = KEY_START(k) - - KEY_START(replace_key); - - /* But it must be a subset of the replace key */ - if (KEY_START(k) < KEY_START(replace_key) || - KEY_OFFSET(k) > KEY_OFFSET(replace_key)) - goto check_failed; - - /* We didn't find a key that we were supposed to */ - if (KEY_START(k) > KEY_START(insert) + sectors_found) - goto check_failed; - - if (KEY_PTRS(k) != KEY_PTRS(replace_key) || - KEY_DIRTY(k) != KEY_DIRTY(replace_key)) - goto check_failed; - - /* skip past gen */ - offset <<= 8; - - BUG_ON(!KEY_PTRS(replace_key)); - - for (i = 0; i < KEY_PTRS(replace_key); i++) - if (k->ptr[i] != replace_key->ptr[i] + offset) - goto check_failed; - - sectors_found = KEY_OFFSET(k) - KEY_START(insert); - } - - if (bkey_cmp(insert, k) < 0 && - bkey_cmp(&START_KEY(insert), &START_KEY(k)) > 0) { - /* - * We overlapped in the middle of an existing key: that - * means we have to split the old key. But we have to do - * slightly different things depending on whether the - * old key has been written out yet. - */ - - struct bkey *top; - - subtract_dirty(k, KEY_START(insert), KEY_SIZE(insert)); - - if (bkey_written(&b->keys, k)) { - /* - * We insert a new key to cover the top of the - * old key, and the old key is modified in place - * to represent the bottom split. - * - * It's completely arbitrary whether the new key - * is the top or the bottom, but it has to match - * up with what btree_sort_fixup() does - it - * doesn't check for this kind of overlap, it - * depends on us inserting a new key for the top - * here. - */ - top = bch_bset_search(&b->keys, - bset_tree_last(&b->keys), - insert); - bch_bset_insert(&b->keys, top, k); - } else { - BKEY_PADDED(key) temp; - bkey_copy(&temp.key, k); - bch_bset_insert(&b->keys, k, &temp.key); - top = bkey_next(k); - } - - bch_cut_front(insert, top); - bch_cut_back(&START_KEY(insert), k); - bch_bset_fix_invalidated_key(&b->keys, k); - return false; - } - - if (bkey_cmp(insert, k) < 0) { - bch_cut_front(insert, k); - } else { - if (bkey_cmp(&START_KEY(insert), &START_KEY(k)) > 0) - old_offset = KEY_START(insert); - - if (bkey_written(&b->keys, k) && - bkey_cmp(&START_KEY(insert), &START_KEY(k)) <= 0) { - /* - * Completely overwrote, so we don't have to - * invalidate the binary search tree - */ - bch_cut_front(k, k); - } else { - __bch_cut_back(&START_KEY(insert), k); - bch_bset_fix_invalidated_key(&b->keys, k); - } - } - - subtract_dirty(k, old_offset, old_size - KEY_SIZE(k)); - } - -check_failed: - if (replace_key) { - if (!sectors_found) { - return true; - } else if (sectors_found < KEY_SIZE(insert)) { - SET_KEY_OFFSET(insert, KEY_OFFSET(insert) - - (KEY_SIZE(insert) - sectors_found)); - SET_KEY_SIZE(insert, sectors_found); - } - } - - return false; -} - -static bool btree_insert_key(struct btree *b, struct btree_op *op, - struct bkey *k, struct bkey *replace_key) -{ - struct bset *i = btree_bset_last(b); - struct bkey *m, *prev; - unsigned status = BTREE_INSERT_STATUS_INSERT; + unsigned status; BUG_ON(bkey_cmp(k, &b->key) > 0); - BUG_ON(b->level && !KEY_PTRS(k)); - BUG_ON(!b->level && !KEY_OFFSET(k)); - if (!b->level) { - struct btree_iter iter; + status = bch_btree_insert_key(&b->keys, k, replace_key); + if (status != BTREE_INSERT_STATUS_NO_INSERT) { + bch_check_keys(&b->keys, "%u for %s", status, + replace_key ? "replace" : "insert"); - /* - * bset_search() returns the first key that is strictly greater - * than the search key - but for back merging, we want to find - * the previous key. - */ - prev = NULL; - m = bch_btree_iter_init(&b->keys, &iter, - PRECEDING_KEY(&START_KEY(k))); - - if (fix_overlapping_extents(b, k, &iter, replace_key)) { - op->insert_collision = true; - return false; - } - - if (KEY_DIRTY(k)) - bcache_dev_sectors_dirty_add(b->c, KEY_INODE(k), - KEY_START(k), KEY_SIZE(k)); - - while (m != bset_bkey_last(i) && - bkey_cmp(k, &START_KEY(m)) > 0) - prev = m, m = bkey_next(m); - - if (key_merging_disabled(b->c)) - goto insert; - - /* prev is in the tree, if we merge we're done */ - status = BTREE_INSERT_STATUS_BACK_MERGE; - if (prev && - bch_bkey_try_merge(&b->keys, prev, k)) - goto merged; - - status = BTREE_INSERT_STATUS_OVERWROTE; - if (m != bset_bkey_last(i) && - KEY_PTRS(m) == KEY_PTRS(k) && !KEY_SIZE(m)) - goto copy; - - status = BTREE_INSERT_STATUS_FRONT_MERGE; - if (m != bset_bkey_last(i) && - bch_bkey_try_merge(&b->keys, k, m)) - goto copy; - } else { - BUG_ON(replace_key); - m = bch_bset_search(&b->keys, bset_tree_last(&b->keys), k); - } - -insert: bch_bset_insert(&b->keys, m, k); -copy: bkey_copy(m, k); -merged: - bch_check_keys(&b->keys, "%u for %s", status, - replace_key ? "replace" : "insert"); - - if (b->level && !KEY_OFFSET(k)) - btree_current_write(b)->prio_blocked++; - - trace_bcache_btree_insert_key(b, k, replace_key != NULL, status); - - return true; + trace_bcache_btree_insert_key(b, k, replace_key != NULL, + status); + return true; + } else + return false; } static size_t insert_u64s_remaining(struct btree *b) @@ -2048,7 +1833,7 @@ static bool bch_btree_insert_keys(struct btree *b, struct btree_op *op, if (!b->level) bkey_put(b->c, k); - ret |= btree_insert_key(b, op, k, replace_key); + ret |= btree_insert_key(b, k, replace_key); bch_keylist_pop_front(insert_keys); } else if (bkey_cmp(&START_KEY(k), &b->key) < 0) { BKEY_PADDED(key) temp; @@ -2057,13 +1842,16 @@ static bool bch_btree_insert_keys(struct btree *b, struct btree_op *op, bch_cut_back(&b->key, &temp.key); bch_cut_front(&b->key, insert_keys->keys); - ret |= btree_insert_key(b, op, &temp.key, replace_key); + ret |= btree_insert_key(b, &temp.key, replace_key); break; } else { break; } } + if (!ret) + op->insert_collision = true; + BUG_ON(!bch_keylist_empty(insert_keys) && b->level); BUG_ON(bch_count_data(&b->keys) < oldsize); diff --git a/drivers/md/bcache/extents.c b/drivers/md/bcache/extents.c index bc1c3eed07e7..d6de3c76a87b 100644 --- a/drivers/md/bcache/extents.c +++ b/drivers/md/bcache/extents.c @@ -222,8 +222,22 @@ static bool bch_btree_ptr_bad(struct btree_keys *bk, const struct bkey *k) return false; } +static bool bch_btree_ptr_insert_fixup(struct btree_keys *bk, + struct bkey *insert, + struct btree_iter *iter, + struct bkey *replace_key) +{ + struct btree *b = container_of(bk, struct btree, keys); + + if (!KEY_OFFSET(insert)) + btree_current_write(b)->prio_blocked++; + + return false; +} + const struct btree_keys_ops bch_btree_keys_ops = { .sort_cmp = bch_key_sort_cmp, + .insert_fixup = bch_btree_ptr_insert_fixup, .key_invalid = bch_btree_ptr_invalid, .key_bad = bch_btree_ptr_bad, .key_to_text = bch_extent_to_text, @@ -294,6 +308,169 @@ static struct bkey *bch_extent_sort_fixup(struct btree_iter *iter, return NULL; } +static bool bch_extent_insert_fixup(struct btree_keys *b, + struct bkey *insert, + struct btree_iter *iter, + struct bkey *replace_key) +{ + struct cache_set *c = container_of(b, struct btree, keys)->c; + + void subtract_dirty(struct bkey *k, uint64_t offset, int sectors) + { + if (KEY_DIRTY(k)) + bcache_dev_sectors_dirty_add(c, KEY_INODE(k), + offset, -sectors); + } + + uint64_t old_offset; + unsigned old_size, sectors_found = 0; + + BUG_ON(!KEY_OFFSET(insert)); + BUG_ON(!KEY_SIZE(insert)); + + while (1) { + struct bkey *k = bch_btree_iter_next(iter); + if (!k) + break; + + if (bkey_cmp(&START_KEY(k), insert) >= 0) { + if (KEY_SIZE(k)) + break; + else + continue; + } + + if (bkey_cmp(k, &START_KEY(insert)) <= 0) + continue; + + old_offset = KEY_START(k); + old_size = KEY_SIZE(k); + + /* + * We might overlap with 0 size extents; we can't skip these + * because if they're in the set we're inserting to we have to + * adjust them so they don't overlap with the key we're + * inserting. But we don't want to check them for replace + * operations. + */ + + if (replace_key && KEY_SIZE(k)) { + /* + * k might have been split since we inserted/found the + * key we're replacing + */ + unsigned i; + uint64_t offset = KEY_START(k) - + KEY_START(replace_key); + + /* But it must be a subset of the replace key */ + if (KEY_START(k) < KEY_START(replace_key) || + KEY_OFFSET(k) > KEY_OFFSET(replace_key)) + goto check_failed; + + /* We didn't find a key that we were supposed to */ + if (KEY_START(k) > KEY_START(insert) + sectors_found) + goto check_failed; + + if (KEY_PTRS(k) != KEY_PTRS(replace_key) || + KEY_DIRTY(k) != KEY_DIRTY(replace_key)) + goto check_failed; + + /* skip past gen */ + offset <<= 8; + + BUG_ON(!KEY_PTRS(replace_key)); + + for (i = 0; i < KEY_PTRS(replace_key); i++) + if (k->ptr[i] != replace_key->ptr[i] + offset) + goto check_failed; + + sectors_found = KEY_OFFSET(k) - KEY_START(insert); + } + + if (bkey_cmp(insert, k) < 0 && + bkey_cmp(&START_KEY(insert), &START_KEY(k)) > 0) { + /* + * We overlapped in the middle of an existing key: that + * means we have to split the old key. But we have to do + * slightly different things depending on whether the + * old key has been written out yet. + */ + + struct bkey *top; + + subtract_dirty(k, KEY_START(insert), KEY_SIZE(insert)); + + if (bkey_written(b, k)) { + /* + * We insert a new key to cover the top of the + * old key, and the old key is modified in place + * to represent the bottom split. + * + * It's completely arbitrary whether the new key + * is the top or the bottom, but it has to match + * up with what btree_sort_fixup() does - it + * doesn't check for this kind of overlap, it + * depends on us inserting a new key for the top + * here. + */ + top = bch_bset_search(b, bset_tree_last(b), + insert); + bch_bset_insert(b, top, k); + } else { + BKEY_PADDED(key) temp; + bkey_copy(&temp.key, k); + bch_bset_insert(b, k, &temp.key); + top = bkey_next(k); + } + + bch_cut_front(insert, top); + bch_cut_back(&START_KEY(insert), k); + bch_bset_fix_invalidated_key(b, k); + goto out; + } + + if (bkey_cmp(insert, k) < 0) { + bch_cut_front(insert, k); + } else { + if (bkey_cmp(&START_KEY(insert), &START_KEY(k)) > 0) + old_offset = KEY_START(insert); + + if (bkey_written(b, k) && + bkey_cmp(&START_KEY(insert), &START_KEY(k)) <= 0) { + /* + * Completely overwrote, so we don't have to + * invalidate the binary search tree + */ + bch_cut_front(k, k); + } else { + __bch_cut_back(&START_KEY(insert), k); + bch_bset_fix_invalidated_key(b, k); + } + } + + subtract_dirty(k, old_offset, old_size - KEY_SIZE(k)); + } + +check_failed: + if (replace_key) { + if (!sectors_found) { + return true; + } else if (sectors_found < KEY_SIZE(insert)) { + SET_KEY_OFFSET(insert, KEY_OFFSET(insert) - + (KEY_SIZE(insert) - sectors_found)); + SET_KEY_SIZE(insert, sectors_found); + } + } +out: + if (KEY_DIRTY(insert)) + bcache_dev_sectors_dirty_add(c, KEY_INODE(insert), + KEY_START(insert), + KEY_SIZE(insert)); + + return false; +} + static bool bch_extent_invalid(struct btree_keys *bk, const struct bkey *k) { struct btree *b = container_of(bk, struct btree, keys); @@ -435,6 +612,7 @@ static bool bch_extent_merge(struct btree_keys *bk, struct bkey *l, struct bkey const struct btree_keys_ops bch_extent_keys_ops = { .sort_cmp = bch_extent_sort_cmp, .sort_fixup = bch_extent_sort_fixup, + .insert_fixup = bch_extent_insert_fixup, .key_invalid = bch_extent_invalid, .key_bad = bch_extent_bad, .key_merge = bch_extent_merge, |