From 829a60b9055c319f3656a01eb8cb78b1b86232ef Mon Sep 17 00:00:00 2001
From: Kent Overstreet <kmo@daterainc.com>
Date: Mon, 11 Nov 2013 17:02:31 -0800
Subject: 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>
---
drivers/md/bcache/bset.c | 50 +++++++++
drivers/md/bcache/bset.h | 12 +++
drivers/md/bcache/btree.c | 246 +++-----------------------------------------
drivers/md/bcache/extents.c | 178 ++++++++++++++++++++++++++++++++
4 files changed, 257 insertions(+), 229 deletions(-)
(limited to 'drivers/md/bcache')
diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c
index 2ff75f3..4a71132 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 4aa199d..759df83 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 b14f34a..463d280 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 bc1c3ee..d6de3c7 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,
--
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