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bcache: Rename/shuffle various code around 

More work to disentangle bset.c from the rest of the code:

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet 2013-12-17 23:49:49 -08:00
parent 67539e8528
commit ee811287c9
8 changed files with 352 additions and 287 deletions
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8
drivers/md/bcache/bcache.h
View File

@ -717,14 +717,6 @@ struct bbio {
#define bucket_bytes(c) ((c)->sb.bucket_size << 9)
#define block_bytes(c) ((c)->sb.block_size << 9)
#define __set_bytes(i, k) (sizeof(*(i)) + (k) * sizeof(uint64_t))
#define set_bytes(i) __set_bytes(i, i->keys)
#define __set_blocks(i, k, c) DIV_ROUND_UP(__set_bytes(i, k), block_bytes(c))
#define set_blocks(i, c) __set_blocks(i, (i)->keys, c)
#define btree_data_space(b) (PAGE_SIZE << (b)->page_order)
#define prios_per_bucket(c) \
((bucket_bytes(c) - sizeof(struct prio_set)) / \
sizeof(struct bucket_disk))

172
drivers/md/bcache/bset.c
View File

@ -302,6 +302,115 @@ bool bch_bkey_try_merge(struct btree *b, struct bkey *l, struct bkey *r)
return true;
}
/* Auxiliary search trees */
/* 32 bits total: */
#define BKEY_MID_BITS 3
#define BKEY_EXPONENT_BITS 7
#define BKEY_MANTISSA_BITS (32 - BKEY_MID_BITS - BKEY_EXPONENT_BITS)
#define BKEY_MANTISSA_MASK ((1 << BKEY_MANTISSA_BITS) - 1)
struct bkey_float {
unsigned exponent:BKEY_EXPONENT_BITS;
unsigned m:BKEY_MID_BITS;
unsigned mantissa:BKEY_MANTISSA_BITS;
} __packed;
/*
* BSET_CACHELINE was originally intended to match the hardware cacheline size -
* it used to be 64, but I realized the lookup code would touch slightly less
* memory if it was 128.
*
* It definites the number of bytes (in struct bset) per struct bkey_float in
* the auxiliar search tree - when we're done searching the bset_float tree we
* have this many bytes left that we do a linear search over.
*
* Since (after level 5) every level of the bset_tree is on a new cacheline,
* we're touching one fewer cacheline in the bset tree in exchange for one more
* cacheline in the linear search - but the linear search might stop before it
* gets to the second cacheline.
*/
#define BSET_CACHELINE 128
/* Space required for the btree node keys */
static inline size_t btree_keys_bytes(struct btree *b)
{
return PAGE_SIZE << b->page_order;
}
static inline size_t btree_keys_cachelines(struct btree *b)
{
return btree_keys_bytes(b) / BSET_CACHELINE;
}
/* Space required for the auxiliary search trees */
static inline size_t bset_tree_bytes(struct btree *b)
{
return btree_keys_cachelines(b) * sizeof(struct bkey_float);
}
/* Space required for the prev pointers */
static inline size_t bset_prev_bytes(struct btree *b)
{
return btree_keys_cachelines(b) * sizeof(uint8_t);
}
/* Memory allocation */
void bch_btree_keys_free(struct btree *b)
{
struct bset_tree *t = b->sets;
if (bset_prev_bytes(b) < PAGE_SIZE)
kfree(t->prev);
else
free_pages((unsigned long) t->prev,
get_order(bset_prev_bytes(b)));
if (bset_tree_bytes(b) < PAGE_SIZE)
kfree(t->tree);
else
free_pages((unsigned long) t->tree,
get_order(bset_tree_bytes(b)));
free_pages((unsigned long) t->data, b->page_order);
t->prev = NULL;
t->tree = NULL;
t->data = NULL;
}
int bch_btree_keys_alloc(struct btree *b, unsigned page_order, gfp_t gfp)
{
struct bset_tree *t = b->sets;
BUG_ON(t->data);
b->page_order = page_order;
t->data = (void *) __get_free_pages(gfp, b->page_order);
if (!t->data)
goto err;
t->tree = bset_tree_bytes(b) < PAGE_SIZE
? kmalloc(bset_tree_bytes(b), gfp)
: (void *) __get_free_pages(gfp, get_order(bset_tree_bytes(b)));
if (!t->tree)
goto err;
t->prev = bset_prev_bytes(b) < PAGE_SIZE
? kmalloc(bset_prev_bytes(b), gfp)
: (void *) __get_free_pages(gfp, get_order(bset_prev_bytes(b)));
if (!t->prev)
goto err;
return 0;
err:
bch_btree_keys_free(b);
return -ENOMEM;
}
/* Binary tree stuff for auxiliary search trees */
static unsigned inorder_next(unsigned j, unsigned size)
@ -538,21 +647,36 @@ static void bset_alloc_tree(struct btree *b, struct bset_tree *t)
t++->size = 0;
}
static void bset_build_unwritten_tree(struct btree *b)
static void bch_bset_build_unwritten_tree(struct btree *b)
{
struct bset_tree *t = b->sets + b->nsets;
struct bset_tree *t = bset_tree_last(b);
bset_alloc_tree(b, t);
if (t->tree != b->sets->tree + bset_tree_space(b)) {
if (t->tree != b->sets->tree + btree_keys_cachelines(b)) {
t->prev[0] = bkey_to_cacheline_offset(t->data->start);
t->size = 1;
}
}
void bch_bset_init_next(struct btree *b, struct bset *i, uint64_t magic)
{
if (i != b->sets->data) {
b->sets[++b->nsets].data = i;
i->seq = b->sets->data->seq;
} else
get_random_bytes(&i->seq, sizeof(uint64_t));
i->magic = magic;
i->version = 0;
i->keys = 0;
bch_bset_build_unwritten_tree(b);
}
static void bset_build_written_tree(struct btree *b)
{
struct bset_tree *t = b->sets + b->nsets;
struct bset_tree *t = bset_tree_last(b);
struct bkey *k = t->data->start;
unsigned j, cacheline = 1;
@ -560,7 +684,7 @@ static void bset_build_written_tree(struct btree *b)
t->size = min_t(unsigned,
bkey_to_cacheline(t, bset_bkey_last(t->data)),
b->sets->tree + bset_tree_space(b) - t->tree);
b->sets->tree + btree_keys_cachelines(b) - t->tree);
if (t->size < 2) {
t->size = 0;
@ -599,7 +723,7 @@ void bch_bset_fix_invalidated_key(struct btree *b, struct bkey *k)
struct bset_tree *t;
unsigned inorder, j = 1;
for (t = b->sets; t <= &b->sets[b->nsets]; t++)
for (t = b->sets; t <= bset_tree_last(b); t++)
if (k < bset_bkey_last(t->data))
goto found_set;
@ -639,9 +763,10 @@ fix_right: do {
} while (j < t->size);
}
void bch_bset_fix_lookup_table(struct btree *b, struct bkey *k)
static void bch_bset_fix_lookup_table(struct btree *b,
struct bset_tree *t,
struct bkey *k)
{
struct bset_tree *t = &b->sets[b->nsets];
unsigned shift = bkey_u64s(k);
unsigned j = bkey_to_cacheline(t, k);
@ -673,7 +798,7 @@ void bch_bset_fix_lookup_table(struct btree *b, struct bkey *k)
}
}
if (t->size == b->sets->tree + bset_tree_space(b) - t->tree)
if (t->size == b->sets->tree + btree_keys_cachelines(b) - t->tree)
return;
/* Possibly add a new entry to the end of the lookup table */
@ -687,21 +812,23 @@ void bch_bset_fix_lookup_table(struct btree *b, struct bkey *k)
}
}
void bch_bset_init_next(struct btree *b)
void bch_bset_insert(struct btree *b, struct bkey *where,
struct bkey *insert)
{
struct bset *i = write_block(b);
struct bset_tree *t = bset_tree_last(b);
if (i != b->sets[0].data) {
b->sets[++b->nsets].data = i;
i->seq = b->sets[0].data->seq;
} else
get_random_bytes(&i->seq, sizeof(uint64_t));
BUG_ON(t->data != write_block(b));
BUG_ON(bset_byte_offset(b, t->data) +
__set_bytes(t->data, t->data->keys + bkey_u64s(insert)) >
PAGE_SIZE << b->page_order);
i->magic = bset_magic(&b->c->sb);
i->version = 0;
i->keys = 0;
memmove((uint64_t *) where + bkey_u64s(insert),
where,
(void *) bset_bkey_last(t->data) - (void *) where);
bset_build_unwritten_tree(b);
t->data->keys += bkey_u64s(insert);
bkey_copy(where, insert);
bch_bset_fix_lookup_table(b, t, where);
}
struct bset_search_iter {
@ -1154,9 +1281,8 @@ void bch_btree_sort_partial(struct btree *b, unsigned start,
__bch_btree_iter_init(b, &iter, NULL, &b->sets[start]);
BUG_ON(b->sets[b->nsets].data == write_block(b) &&
(b->sets[b->nsets].size || b->nsets));
BUG_ON(!bset_written(b, bset_tree_last(b)) &&
(bset_tree_last(b)->size || b->nsets));
if (start) {
unsigned i;

269
drivers/md/bcache/bset.h
View File

@ -144,12 +144,60 @@
* first key in that range of bytes again.
*/
struct cache_set;
/* Btree key comparison/iteration */
struct btree;
struct bkey_float;
#define MAX_BSETS 4U
struct bset_tree {
/*
* We construct a binary tree in an array as if the array
* started at 1, so that things line up on the same cachelines
* better: see comments in bset.c at cacheline_to_bkey() for
* details
*/
/* size of the binary tree and prev array */
unsigned size;
/* function of size - precalculated for to_inorder() */
unsigned extra;
/* copy of the last key in the set */
struct bkey end;
struct bkey_float *tree;
/*
* The nodes in the bset tree point to specific keys - this
* array holds the sizes of the previous key.
*
* Conceptually it's a member of struct bkey_float, but we want
* to keep bkey_float to 4 bytes and prev isn't used in the fast
* path.
*/
uint8_t *prev;
/* The actual btree node, with pointers to each sorted set */
struct bset *data;
};
#define __set_bytes(i, k) (sizeof(*(i)) + (k) * sizeof(uint64_t))
#define set_bytes(i) __set_bytes(i, i->keys)
#define __set_blocks(i, k, block_bytes) \
DIV_ROUND_UP(__set_bytes(i, k), block_bytes)
#define set_blocks(i, block_bytes) \
__set_blocks(i, (i)->keys, block_bytes)
void bch_btree_keys_free(struct btree *);
int bch_btree_keys_alloc(struct btree *, unsigned, gfp_t);
void bch_bset_fix_invalidated_key(struct btree *, struct bkey *);
void bch_bset_init_next(struct btree *, struct bset *, uint64_t);
void bch_bset_insert(struct btree *, struct bkey *, struct bkey *);
/* Btree key iteration */
struct btree_iter {
size_t size, used;
#ifdef CONFIG_BCACHE_DEBUG
@ -160,37 +208,27 @@ struct btree_iter {
} data[MAX_BSETS];
};
struct bset_tree {
/*
* We construct a binary tree in an array as if the array
* started at 1, so that things line up on the same cachelines
* better: see comments in bset.c at cacheline_to_bkey() for
* details
*/
typedef bool (*ptr_filter_fn)(struct btree *, const struct bkey *);
/* size of the binary tree and prev array */
unsigned size;
struct bkey *bch_btree_iter_next(struct btree_iter *);
struct bkey *bch_btree_iter_next_filter(struct btree_iter *,
struct btree *, ptr_filter_fn);
/* function of size - precalculated for to_inorder() */
unsigned extra;
void bch_btree_iter_push(struct btree_iter *, struct bkey *, struct bkey *);
struct bkey *bch_btree_iter_init(struct btree *, struct btree_iter *,
struct bkey *);
/* copy of the last key in the set */
struct bkey end;
struct bkey_float *tree;
struct bkey *__bch_bset_search(struct btree *, struct bset_tree *,
const struct bkey *);
/*
* The nodes in the bset tree point to specific keys - this
* array holds the sizes of the previous key.
*
* Conceptually it's a member of struct bkey_float, but we want
* to keep bkey_float to 4 bytes and prev isn't used in the fast
* path.
*/
uint8_t *prev;
/* The actual btree node, with pointers to each sorted set */
struct bset *data;
};
/*
* Returns the first key that is strictly greater than search
*/
static inline struct bkey *bch_bset_search(struct btree *b, struct bset_tree *t,
const struct bkey *search)
{
return search ? __bch_bset_search(b, t, search) : t->data->start;
}
/* Sorting */
@ -219,6 +257,60 @@ static inline void bch_btree_sort(struct btree *b,
bch_btree_sort_partial(b, 0, state);
}
/* Bkey utility code */
#define bset_bkey_last(i) bkey_idx((struct bkey *) (i)->d, (i)->keys)
static inline struct bkey *bset_bkey_idx(struct bset *i, unsigned idx)
{
return bkey_idx(i->start, idx);
}
static inline void bkey_init(struct bkey *k)
{
*k = ZERO_KEY;
}
static __always_inline int64_t bkey_cmp(const struct bkey *l,
const struct bkey *r)
{
return unlikely(KEY_INODE(l) != KEY_INODE(r))
? (int64_t) KEY_INODE(l) - (int64_t) KEY_INODE(r)
: (int64_t) KEY_OFFSET(l) - (int64_t) KEY_OFFSET(r);
}
void bch_bkey_copy_single_ptr(struct bkey *, const struct bkey *,
unsigned);
bool __bch_cut_front(const struct bkey *, struct bkey *);
bool __bch_cut_back(const struct bkey *, struct bkey *);
static inline bool bch_cut_front(const struct bkey *where, struct bkey *k)
{
BUG_ON(bkey_cmp(where, k) > 0);
return __bch_cut_front(where, k);
}
static inline bool bch_cut_back(const struct bkey *where, struct bkey *k)
{
BUG_ON(bkey_cmp(where, &START_KEY(k)) < 0);
return __bch_cut_back(where, k);
}
#define PRECEDING_KEY(_k) \
({ \
struct bkey *_ret = NULL; \
\
if (KEY_INODE(_k) || KEY_OFFSET(_k)) { \
_ret = &KEY(KEY_INODE(_k), KEY_OFFSET(_k), 0); \
\
if (!_ret->low) \
_ret->high--; \
_ret->low--; \
} \
\
_ret; \
})
/* Keylists */
struct keylist {
@ -282,126 +374,15 @@ struct bkey *bch_keylist_pop(struct keylist *);
void bch_keylist_pop_front(struct keylist *);
int __bch_keylist_realloc(struct keylist *, unsigned);
/* Bkey utility code */
#define bset_bkey_last(i) bkey_idx((struct bkey *) (i)->d, (i)->keys)
static inline struct bkey *bset_bkey_idx(struct bset *i, unsigned idx)
{
return bkey_idx(i->start, idx);
}
static inline void bkey_init(struct bkey *k)
{
*k = ZERO_KEY;
}
static __always_inline int64_t bkey_cmp(const struct bkey *l,
const struct bkey *r)
{
return unlikely(KEY_INODE(l) != KEY_INODE(r))
? (int64_t) KEY_INODE(l) - (int64_t) KEY_INODE(r)
: (int64_t) KEY_OFFSET(l) - (int64_t) KEY_OFFSET(r);
}
void bch_bkey_copy_single_ptr(struct bkey *, const struct bkey *,
unsigned);
bool __bch_cut_front(const struct bkey *, struct bkey *);
bool __bch_cut_back(const struct bkey *, struct bkey *);
static inline bool bch_cut_front(const struct bkey *where, struct bkey *k)
{
BUG_ON(bkey_cmp(where, k) > 0);
return __bch_cut_front(where, k);
}
static inline bool bch_cut_back(const struct bkey *where, struct bkey *k)
{
BUG_ON(bkey_cmp(where, &START_KEY(k)) < 0);
return __bch_cut_back(where, k);
}
struct cache_set;
const char *bch_ptr_status(struct cache_set *, const struct bkey *);
bool bch_btree_ptr_invalid(struct cache_set *, const struct bkey *);
bool bch_extent_ptr_invalid(struct cache_set *, const struct bkey *);
bool bch_btree_ptr_bad(struct btree *, const struct bkey *);
bool bch_extent_ptr_bad(struct btree *, const struct bkey *);
bool bch_ptr_bad(struct btree *, const struct bkey *);
typedef bool (*ptr_filter_fn)(struct btree *, const struct bkey *);
struct bkey *bch_btree_iter_next(struct btree_iter *);
struct bkey *bch_btree_iter_next_filter(struct btree_iter *,
struct btree *, ptr_filter_fn);
void bch_btree_iter_push(struct btree_iter *, struct bkey *, struct bkey *);
struct bkey *bch_btree_iter_init(struct btree *, struct btree_iter *,
struct bkey *);
/* 32 bits total: */
#define BKEY_MID_BITS 3
#define BKEY_EXPONENT_BITS 7
#define BKEY_MANTISSA_BITS 22
#define BKEY_MANTISSA_MASK ((1 << BKEY_MANTISSA_BITS) - 1)
struct bkey_float {
unsigned exponent:BKEY_EXPONENT_BITS;
unsigned m:BKEY_MID_BITS;
unsigned mantissa:BKEY_MANTISSA_BITS;
} __packed;
/*
* BSET_CACHELINE was originally intended to match the hardware cacheline size -
* it used to be 64, but I realized the lookup code would touch slightly less
* memory if it was 128.
*
* It definites the number of bytes (in struct bset) per struct bkey_float in
* the auxiliar search tree - when we're done searching the bset_float tree we
* have this many bytes left that we do a linear search over.
*
* Since (after level 5) every level of the bset_tree is on a new cacheline,
* we're touching one fewer cacheline in the bset tree in exchange for one more
* cacheline in the linear search - but the linear search might stop before it
* gets to the second cacheline.
*/
#define BSET_CACHELINE 128
#define bset_tree_space(b) (btree_data_space(b) / BSET_CACHELINE)
#define bset_tree_bytes(b) (bset_tree_space(b) * sizeof(struct bkey_float))
#define bset_prev_bytes(b) (bset_tree_space(b) * sizeof(uint8_t))
void bch_bset_init_next(struct btree *);
void bch_bset_fix_invalidated_key(struct btree *, struct bkey *);
void bch_bset_fix_lookup_table(struct btree *, struct bkey *);
struct bkey *__bch_bset_search(struct btree *, struct bset_tree *,
const struct bkey *);
/*
* Returns the first key that is strictly greater than search
*/
static inline struct bkey *bch_bset_search(struct btree *b, struct bset_tree *t,
const struct bkey *search)
{
return search ? __bch_bset_search(b, t, search) : t->data->start;
}
#define PRECEDING_KEY(_k) \
({ \
struct bkey *_ret = NULL; \
\
if (KEY_INODE(_k) || KEY_OFFSET(_k)) { \
_ret = &KEY(KEY_INODE(_k), KEY_OFFSET(_k), 0); \
\
if (!_ret->low) \
_ret->high--; \
_ret->low--; \
} \
\
_ret; \
})
bool bch_bkey_try_merge(struct btree *, struct bkey *, struct bkey *);
int bch_bset_print_stats(struct cache_set *, char *);

167
drivers/md/bcache/btree.c
View File

@ -110,7 +110,7 @@ static inline bool should_split(struct btree *b)
{
struct bset *i = write_block(b);
return b->written >= btree_blocks(b) ||
(b->written + __set_blocks(i, i->keys + 15, b->c)
(b->written + __set_blocks(i, i->keys + 15, block_bytes(b->c))
> btree_blocks(b));
}
@ -206,7 +206,7 @@ static uint64_t btree_csum_set(struct btree *b, struct bset *i)
void bch_btree_node_read_done(struct btree *b)
{
const char *err = "bad btree header";
struct bset *i = b->sets[0].data;
struct bset *i = btree_bset_first(b);
struct btree_iter *iter;
iter = mempool_alloc(b->c->fill_iter, GFP_NOWAIT);
@ -228,7 +228,8 @@ void bch_btree_node_read_done(struct btree *b)
goto err;
err = "bad btree header";
if (b->written + set_blocks(i, b->c) > btree_blocks(b))
if (b->written + set_blocks(i, block_bytes(b->c)) >
btree_blocks(b))
goto err;
err = "bad magic";
@ -253,7 +254,7 @@ void bch_btree_node_read_done(struct btree *b)
bch_btree_iter_push(iter, i->start, bset_bkey_last(i));
b->written += set_blocks(i, b->c);
b->written += set_blocks(i, block_bytes(b->c));
}
err = "corrupted btree";
@ -272,7 +273,7 @@ void bch_btree_node_read_done(struct btree *b)
goto err;
if (b->written < btree_blocks(b))
bch_bset_init_next(b);
bch_bset_init_next(b, write_block(b), bset_magic(&b->c->sb));
out:
mempool_free(iter, b->c->fill_iter);
return;
@ -393,7 +394,7 @@ static void btree_node_write_endio(struct bio *bio, int error)
static void do_btree_node_write(struct btree *b)
{
struct closure *cl = &b->io;
struct bset *i = b->sets[b->nsets].data;
struct bset *i = btree_bset_last(b);
BKEY_PADDED(key) k;
i->version = BCACHE_BSET_VERSION;
@ -405,7 +406,7 @@ static void do_btree_node_write(struct btree *b)
b->bio->bi_end_io = btree_node_write_endio;
b->bio->bi_private = cl;
b->bio->bi_rw = REQ_META|WRITE_SYNC|REQ_FUA;
b->bio->bi_iter.bi_size = set_blocks(i, b->c) * block_bytes(b->c);
b->bio->bi_iter.bi_size = roundup(set_bytes(i), block_bytes(b->c));
bch_bio_map(b->bio, i);
/*
@ -424,7 +425,8 @@ static void do_btree_node_write(struct btree *b)
*/
bkey_copy(&k.key, &b->key);
SET_PTR_OFFSET(&k.key, 0, PTR_OFFSET(&k.key, 0) + bset_offset(b, i));
SET_PTR_OFFSET(&k.key, 0, PTR_OFFSET(&k.key, 0) +
bset_sector_offset(b, i));
if (!bio_alloc_pages(b->bio, GFP_NOIO)) {
int j;
@ -451,14 +453,14 @@ static void do_btree_node_write(struct btree *b)
void bch_btree_node_write(struct btree *b, struct closure *parent)
{
struct bset *i = b->sets[b->nsets].data;
struct bset *i = btree_bset_last(b);
trace_bcache_btree_write(b);
BUG_ON(current->bio_list);
BUG_ON(b->written >= btree_blocks(b));
BUG_ON(b->written && !i->keys);
BUG_ON(b->sets->data->seq != i->seq);
BUG_ON(btree_bset_first(b)->seq != i->seq);
bch_check_keys(b, "writing");
cancel_delayed_work(&b->work);
@ -472,8 +474,8 @@ void bch_btree_node_write(struct btree *b, struct closure *parent)
do_btree_node_write(b);
b->written += set_blocks(i, b->c);
atomic_long_add(set_blocks(i, b->c) * b->c->sb.block_size,
b->written += set_blocks(i, block_bytes(b->c));
atomic_long_add(set_blocks(i, block_bytes(b->c)) * b->c->sb.block_size,
&PTR_CACHE(b->c, &b->key, 0)->btree_sectors_written);
/* If not a leaf node, always sort */
@ -490,7 +492,7 @@ void bch_btree_node_write(struct btree *b, struct closure *parent)
bch_btree_verify(b);
if (b->written < btree_blocks(b))
bch_bset_init_next(b);
bch_bset_init_next(b, write_block(b), bset_magic(&b->c->sb));
}
static void bch_btree_node_write_sync(struct btree *b)
@ -515,7 +517,7 @@ static void btree_node_write_work(struct work_struct *w)
static void bch_btree_leaf_dirty(struct btree *b, atomic_t *journal_ref)
{
struct bset *i = b->sets[b->nsets].data;
struct bset *i = btree_bset_last(b);
struct btree_write *w = btree_current_write(b);
BUG_ON(!b->written);
@ -575,29 +577,12 @@ static void mca_reinit(struct btree *b)
static void mca_data_free(struct btree *b)
{
struct bset_tree *t = b->sets;
BUG_ON(b->io_mutex.count != 1);
if (bset_prev_bytes(b) < PAGE_SIZE)
kfree(t->prev);
else
free_pages((unsigned long) t->prev,
get_order(bset_prev_bytes(b)));
bch_btree_keys_free(b);
if (bset_tree_bytes(b) < PAGE_SIZE)
kfree(t->tree);
else
free_pages((unsigned long) t->tree,
get_order(bset_tree_bytes(b)));
free_pages((unsigned long) t->data, b->page_order);
t->prev = NULL;
t->tree = NULL;
t->data = NULL;
list_move(&b->list, &b->c->btree_cache_freed);
b->c->bucket_cache_used--;
list_move(&b->list, &b->c->btree_cache_freed);
}
static void mca_bucket_free(struct btree *b)
@ -616,34 +601,16 @@ static unsigned btree_order(struct bkey *k)
static void mca_data_alloc(struct btree *b, struct bkey *k, gfp_t gfp)
{
struct bset_tree *t = b->sets;
BUG_ON(t->data);
b->page_order = max_t(unsigned,
ilog2(b->c->btree_pages),
btree_order(k));
t->data = (void *) __get_free_pages(gfp, b->page_order);
if (!t->data)
goto err;
t->tree = bset_tree_bytes(b) < PAGE_SIZE
? kmalloc(bset_tree_bytes(b), gfp)
: (void *) __get_free_pages(gfp, get_order(bset_tree_bytes(b)));
if (!t->tree)
goto err;
t->prev = bset_prev_bytes(b) < PAGE_SIZE
? kmalloc(bset_prev_bytes(b), gfp)
: (void *) __get_free_pages(gfp, get_order(bset_prev_bytes(b)));
if (!t->prev)
goto err;
list_move(&b->list, &b->c->btree_cache);
b->c->bucket_cache_used++;
return;
err:
mca_data_free(b);
if (!bch_btree_keys_alloc(b,
max_t(unsigned,
ilog2(b->c->btree_pages),
btree_order(k)),
gfp)) {
b->c->bucket_cache_used++;
list_move(&b->list, &b->c->btree_cache);
} else {
list_move(&b->list, &b->c->btree_cache_freed);
}
}
static struct btree *mca_bucket_alloc(struct cache_set *c,
@ -1111,7 +1078,7 @@ retry:
}
b->accessed = 1;
bch_bset_init_next(b);
bch_bset_init_next(b, b->sets->data, bset_magic(&b->c->sb));
mutex_unlock(&c->bucket_lock);
@ -1298,7 +1265,8 @@ static int btree_gc_coalesce(struct btree *b, struct btree_op *op,
blocks = btree_default_blocks(b->c) * 2 / 3;
if (nodes < 2 ||
__set_blocks(b->sets[0].data, keys, b->c) > blocks * (nodes - 1))
__set_blocks(b->sets[0].data, keys,
block_bytes(b->c)) > blocks * (nodes - 1))
return 0;
for (i = 0; i < nodes; i++) {
@ -1308,8 +1276,8 @@ static int btree_gc_coalesce(struct btree *b, struct btree_op *op,
}
for (i = nodes - 1; i > 0; --i) {
struct bset *n1 = new_nodes[i]->sets->data;
struct bset *n2 = new_nodes[i - 1]->sets->data;
struct bset *n1 = btree_bset_first(new_nodes[i]);
struct bset *n2 = btree_bset_first(new_nodes[i - 1]);
struct bkey *k, *last = NULL;
keys = 0;
@ -1319,7 +1287,8 @@ static int btree_gc_coalesce(struct btree *b, struct btree_op *op,
k < bset_bkey_last(n2);
k = bkey_next(k)) {
if (__set_blocks(n1, n1->keys + keys +
bkey_u64s(k), b->c) > blocks)
bkey_u64s(k),
block_bytes(b->c)) > blocks)
break;
last = k;
@ -1335,7 +1304,8 @@ static int btree_gc_coalesce(struct btree *b, struct btree_op *op,
* though)
*/
if (__set_blocks(n1, n1->keys + n2->keys,
b->c) > btree_blocks(new_nodes[i]))
block_bytes(b->c)) >
btree_blocks(new_nodes[i]))
goto out_nocoalesce;
keys = n2->keys;
@ -1343,8 +1313,8 @@ static int btree_gc_coalesce(struct btree *b, struct btree_op *op,
last = &r->b->key;
}
BUG_ON(__set_blocks(n1, n1->keys + keys,
b->c) > btree_blocks(new_nodes[i]));
BUG_ON(__set_blocks(n1, n1->keys + keys, block_bytes(b->c)) >
btree_blocks(new_nodes[i]));
if (last)
bkey_copy_key(&new_nodes[i]->key, last);
@ -1380,7 +1350,7 @@ static int btree_gc_coalesce(struct btree *b, struct btree_op *op,
}
/* We emptied out this node */
BUG_ON(new_nodes[0]->sets->data->keys);
BUG_ON(btree_bset_first(new_nodes[0])->keys);
btree_node_free(new_nodes[0]);
rw_unlock(true, new_nodes[0]);
@ -1831,19 +1801,6 @@ err:
/* Btree insertion */
static void shift_keys(struct btree *b, struct bkey *where, struct bkey *insert)
{
struct bset *i = b->sets[b->nsets].data;
memmove((uint64_t *) where + bkey_u64s(insert),
where,
(void *) bset_bkey_last(i) - (void *) where);
i->keys += bkey_u64s(insert);
bkey_copy(where, insert);
bch_bset_fix_lookup_table(b, where);
}
static bool fix_overlapping_extents(struct btree *b, struct bkey *insert,
struct btree_iter *iter,
struct bkey *replace_key)
@ -1944,13 +1901,13 @@ static bool fix_overlapping_extents(struct btree *b, struct bkey *insert,
* depends on us inserting a new key for the top
* here.
*/
top = bch_bset_search(b, &b->sets[b->nsets],
top = bch_bset_search(b, bset_tree_last(b),
insert);
shift_keys(b, top, k);
bch_bset_insert(b, top, k);
} else {
BKEY_PADDED(key) temp;
bkey_copy(&temp.key, k);
shift_keys(b, k, &temp.key);
bch_bset_insert(b, k, &temp.key);
top = bkey_next(k);
}
@ -1999,7 +1956,7 @@ check_failed:
static bool btree_insert_key(struct btree *b, struct btree_op *op,
struct bkey *k, struct bkey *replace_key)
{
struct bset *i = b->sets[b->nsets].data;
struct bset *i = btree_bset_last(b);
struct bkey *m, *prev;
unsigned status = BTREE_INSERT_STATUS_INSERT;
@ -2051,10 +2008,10 @@ static bool btree_insert_key(struct btree *b, struct btree_op *op,
goto copy;
} else {
BUG_ON(replace_key);
m = bch_bset_search(b, &b->sets[b->nsets], k);
m = bch_bset_search(b, bset_tree_last(b), k);
}
insert: shift_keys(b, m, k);
insert: bch_bset_insert(b, m, k);
copy: bkey_copy(m, k);
merged:
bch_check_keys(b, "%u for %s", status,
@ -2079,8 +2036,9 @@ static bool bch_btree_insert_keys(struct btree *b, struct btree_op *op,
struct bset *i = write_block(b);
struct bkey *k = insert_keys->keys;
if (b->written + __set_blocks(i, i->keys + bkey_u64s(k), b->c)
> btree_blocks(b))
if (b->written +
__set_blocks(i, i->keys + bkey_u64s(k),
block_bytes(b->c)) > btree_blocks(b))
break;
if (bkey_cmp(k, &b->key) <= 0) {
@ -2130,12 +2088,13 @@ static int btree_split(struct btree *b, struct btree_op *op,
if (IS_ERR(n1))
goto err;
split = set_blocks(n1->sets[0].data, n1->c) > (btree_blocks(b) * 4) / 5;
split = set_blocks(btree_bset_first(n1),
block_bytes(n1->c)) > (btree_blocks(b) * 4) / 5;
if (split) {
unsigned keys = 0;
trace_bcache_btree_node_split(b, n1->sets[0].data->keys);
trace_bcache_btree_node_split(b, btree_bset_first(n1)->keys);
n2 = bch_btree_node_alloc(b->c, b->level, true);
if (IS_ERR(n2))
@ -2154,20 +2113,20 @@ static int btree_split(struct btree *b, struct btree_op *op,
* search tree yet
*/
while (keys < (n1->sets[0].data->keys * 3) / 5)
keys += bkey_u64s(bset_bkey_idx(n1->sets[0].data,
while (keys < (btree_bset_first(n1)->keys * 3) / 5)
keys += bkey_u64s(bset_bkey_idx(btree_bset_first(n1),
keys));
bkey_copy_key(&n1->key,
bset_bkey_idx(n1->sets[0].data, keys));
keys += bkey_u64s(bset_bkey_idx(n1->sets[0].data, keys));
bset_bkey_idx(btree_bset_first(n1), keys));
keys += bkey_u64s(bset_bkey_idx(btree_bset_first(n1), keys));
n2->sets[0].data->keys = n1->sets[0].data->keys - keys;
n1->sets[0].data->keys = keys;
btree_bset_first(n2)->keys = btree_bset_first(n1)->keys - keys;
btree_bset_first(n1)->keys = keys;
memcpy(n2->sets[0].data->start,
bset_bkey_last(n1->sets[0].data),
n2->sets[0].data->keys * sizeof(uint64_t));
memcpy(btree_bset_first(n2)->start,
bset_bkey_last(btree_bset_first(n1)),
btree_bset_first(n2)->keys * sizeof(uint64_t));
bkey_copy_key(&n2->key, &b->key);
@ -2175,7 +2134,7 @@ static int btree_split(struct btree *b, struct btree_op *op,
bch_btree_node_write(n2, &cl);
rw_unlock(true, n2);
} else {
trace_bcache_btree_node_compact(b, n1->sets[0].data->keys);
trace_bcache_btree_node_compact(b, btree_bset_first(n1)->keys);
bch_btree_insert_keys(n1, op, insert_keys, replace_key);
}
@ -2256,7 +2215,7 @@ static int bch_btree_insert_node(struct btree *b, struct btree_op *op,
-EINTR;
}
} else {
BUG_ON(write_block(b) != b->sets[b->nsets].data);
BUG_ON(write_block(b) != btree_bset_last(b));
if (bch_btree_insert_keys(b, op, insert_keys, replace_key)) {
if (!b->level)

9
drivers/md/bcache/btree.h
View File

@ -180,9 +180,9 @@ static inline struct btree_write *btree_prev_write(struct btree *b)
return b->writes + (btree_node_write_idx(b) ^ 1);
}
static inline unsigned bset_offset(struct btree *b, struct bset *i)
static inline struct bset_tree *bset_tree_last(struct btree *b)
{
return (((size_t) i) - ((size_t) b->sets->data)) >> 9;
return b->sets + b->nsets;
}
static inline struct bset *btree_bset_first(struct btree *b)
@ -190,6 +190,11 @@ static inline struct bset *btree_bset_first(struct btree *b)
return b->sets->data;
}
static inline struct bset *btree_bset_last(struct btree *b)
{
return bset_tree_last(b)->data;
}
static inline unsigned bset_byte_offset(struct btree *b, struct bset *i)
{
return ((size_t) i) - ((size_t) b->sets->data);

3
drivers/md/bcache/debug.c
View File

@ -123,7 +123,8 @@ static void bch_dump_bucket(struct btree *b)
for (i = (start); \
(void *) i < (void *) (start) + (KEY_SIZE(&b->key) << 9) &&\
i->seq == (start)->seq; \
i = (void *) i + set_blocks(i, b->c) * block_bytes(b->c))
i = (void *) i + set_blocks(i, block_bytes(b->c)) * \
block_bytes(b->c))
void bch_btree_verify(struct btree *b)
{

9
drivers/md/bcache/journal.c
View File

@ -95,7 +95,7 @@ reread: left = ca->sb.bucket_size - offset;
return ret;
}
blocks = set_blocks(j, ca->set);
blocks = set_blocks(j, block_bytes(ca->set));
while (!list_empty(list)) {
i = list_first_entry(list,
@ -579,7 +579,8 @@ static void journal_write_unlocked(struct closure *cl)
struct cache *ca;
struct journal_write *w = c->journal.cur;
struct bkey *k = &c->journal.key;
unsigned i, sectors = set_blocks(w->data, c) * c->sb.block_size;
unsigned i, sectors = set_blocks(w->data, block_bytes(c)) *
c->sb.block_size;
struct bio *bio;
struct bio_list list;
@ -595,7 +596,7 @@ static void journal_write_unlocked(struct closure *cl)
continue_at(cl, journal_write, system_wq);
}
c->journal.blocks_free -= set_blocks(w->data, c);
c->journal.blocks_free -= set_blocks(w->data, block_bytes(c));
w->data->btree_level = c->root->level;
@ -685,7 +686,7 @@ static struct journal_write *journal_wait_for_write(struct cache_set *c,
struct journal_write *w = c->journal.cur;
sectors = __set_blocks(w->data, w->data->keys + nkeys,
c) * c->sb.block_size;
block_bytes(c)) * c->sb.block_size;
if (sectors <= min_t(size_t,
c->journal.blocks_free * c->sb.block_size,

2
drivers/md/bcache/super.c
View File

@ -1477,7 +1477,7 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
c->block_bits = ilog2(sb->block_size);
c->nr_uuids = bucket_bytes(c) / sizeof(struct uuid_entry);
c->btree_pages = c->sb.bucket_size / PAGE_SECTORS;
c->btree_pages = bucket_pages(c);
if (c->btree_pages > BTREE_MAX_PAGES)
c->btree_pages = max_t(int, c->btree_pages / 4,
BTREE_MAX_PAGES);