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![Coly Li](/assets/img/avatar_default.png)
The header file include/uapi/linux/bcache.h is not really a user space API heaer. This file defines the ondisk format of bcache internal meta data but no one includes it from user space, bcache-tools has its own copy of this header with minor modification. Therefore, this patch moves include/uapi/linux/bcache.h to bcache code directory as drivers/md/bcache/bcache_ondisk.h. Suggested-by: Arnd Bergmann <arnd@kernel.org> Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Coly Li <colyli@suse.de> Link: https://lore.kernel.org/r/20211029060930.119923-2-colyli@suse.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
593 lines
19 KiB
C
593 lines
19 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHE_BSET_H
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#define _BCACHE_BSET_H
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include "bcache_ondisk.h"
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#include "util.h" /* for time_stats */
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/*
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* BKEYS:
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*
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* A bkey contains a key, a size field, a variable number of pointers, and some
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* ancillary flag bits.
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*
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* We use two different functions for validating bkeys, bch_ptr_invalid and
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* bch_ptr_bad().
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*
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* bch_ptr_invalid() primarily filters out keys and pointers that would be
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* invalid due to some sort of bug, whereas bch_ptr_bad() filters out keys and
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* pointer that occur in normal practice but don't point to real data.
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*
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* The one exception to the rule that ptr_invalid() filters out invalid keys is
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* that it also filters out keys of size 0 - these are keys that have been
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* completely overwritten. It'd be safe to delete these in memory while leaving
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* them on disk, just unnecessary work - so we filter them out when resorting
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* instead.
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*
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* We can't filter out stale keys when we're resorting, because garbage
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* collection needs to find them to ensure bucket gens don't wrap around -
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* unless we're rewriting the btree node those stale keys still exist on disk.
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*
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* We also implement functions here for removing some number of sectors from the
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* front or the back of a bkey - this is mainly used for fixing overlapping
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* extents, by removing the overlapping sectors from the older key.
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*
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* BSETS:
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*
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* A bset is an array of bkeys laid out contiguously in memory in sorted order,
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* along with a header. A btree node is made up of a number of these, written at
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* different times.
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*
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* There could be many of them on disk, but we never allow there to be more than
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* 4 in memory - we lazily resort as needed.
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*
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* We implement code here for creating and maintaining auxiliary search trees
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* (described below) for searching an individial bset, and on top of that we
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* implement a btree iterator.
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*
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* BTREE ITERATOR:
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*
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* Most of the code in bcache doesn't care about an individual bset - it needs
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* to search entire btree nodes and iterate over them in sorted order.
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*
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* The btree iterator code serves both functions; it iterates through the keys
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* in a btree node in sorted order, starting from either keys after a specific
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* point (if you pass it a search key) or the start of the btree node.
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*
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* AUXILIARY SEARCH TREES:
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*
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* Since keys are variable length, we can't use a binary search on a bset - we
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* wouldn't be able to find the start of the next key. But binary searches are
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* slow anyways, due to terrible cache behaviour; bcache originally used binary
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* searches and that code topped out at under 50k lookups/second.
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*
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* So we need to construct some sort of lookup table. Since we only insert keys
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* into the last (unwritten) set, most of the keys within a given btree node are
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* usually in sets that are mostly constant. We use two different types of
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* lookup tables to take advantage of this.
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*
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* Both lookup tables share in common that they don't index every key in the
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* set; they index one key every BSET_CACHELINE bytes, and then a linear search
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* is used for the rest.
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*
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* For sets that have been written to disk and are no longer being inserted
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* into, we construct a binary search tree in an array - traversing a binary
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* search tree in an array gives excellent locality of reference and is very
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* fast, since both children of any node are adjacent to each other in memory
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* (and their grandchildren, and great grandchildren...) - this means
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* prefetching can be used to great effect.
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*
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* It's quite useful performance wise to keep these nodes small - not just
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* because they're more likely to be in L2, but also because we can prefetch
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* more nodes on a single cacheline and thus prefetch more iterations in advance
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* when traversing this tree.
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*
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* Nodes in the auxiliary search tree must contain both a key to compare against
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* (we don't want to fetch the key from the set, that would defeat the purpose),
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* and a pointer to the key. We use a few tricks to compress both of these.
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*
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* To compress the pointer, we take advantage of the fact that one node in the
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* search tree corresponds to precisely BSET_CACHELINE bytes in the set. We have
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* a function (to_inorder()) that takes the index of a node in a binary tree and
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* returns what its index would be in an inorder traversal, so we only have to
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* store the low bits of the offset.
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*
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* The key is 84 bits (KEY_DEV + key->key, the offset on the device). To
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* compress that, we take advantage of the fact that when we're traversing the
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* search tree at every iteration we know that both our search key and the key
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* we're looking for lie within some range - bounded by our previous
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* comparisons. (We special case the start of a search so that this is true even
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* at the root of the tree).
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*
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* So we know the key we're looking for is between a and b, and a and b don't
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* differ higher than bit 50, we don't need to check anything higher than bit
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* 50.
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*
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* We don't usually need the rest of the bits, either; we only need enough bits
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* to partition the key range we're currently checking. Consider key n - the
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* key our auxiliary search tree node corresponds to, and key p, the key
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* immediately preceding n. The lowest bit we need to store in the auxiliary
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* search tree is the highest bit that differs between n and p.
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*
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* Note that this could be bit 0 - we might sometimes need all 80 bits to do the
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* comparison. But we'd really like our nodes in the auxiliary search tree to be
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* of fixed size.
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*
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* The solution is to make them fixed size, and when we're constructing a node
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* check if p and n differed in the bits we needed them to. If they don't we
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* flag that node, and when doing lookups we fallback to comparing against the
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* real key. As long as this doesn't happen to often (and it seems to reliably
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* happen a bit less than 1% of the time), we win - even on failures, that key
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* is then more likely to be in cache than if we were doing binary searches all
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* the way, since we're touching so much less memory.
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*
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* The keys in the auxiliary search tree are stored in (software) floating
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* point, with an exponent and a mantissa. The exponent needs to be big enough
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* to address all the bits in the original key, but the number of bits in the
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* mantissa is somewhat arbitrary; more bits just gets us fewer failures.
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*
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* We need 7 bits for the exponent and 3 bits for the key's offset (since keys
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* are 8 byte aligned); using 22 bits for the mantissa means a node is 4 bytes.
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* We need one node per 128 bytes in the btree node, which means the auxiliary
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* search trees take up 3% as much memory as the btree itself.
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*
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* Constructing these auxiliary search trees is moderately expensive, and we
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* don't want to be constantly rebuilding the search tree for the last set
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* whenever we insert another key into it. For the unwritten set, we use a much
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* simpler lookup table - it's just a flat array, so index i in the lookup table
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* corresponds to the i range of BSET_CACHELINE bytes in the set. Indexing
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* within each byte range works the same as with the auxiliary search trees.
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*
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* These are much easier to keep up to date when we insert a key - we do it
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* somewhat lazily; when we shift a key up we usually just increment the pointer
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* to it, only when it would overflow do we go to the trouble of finding the
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* first key in that range of bytes again.
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*/
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struct btree_keys;
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struct btree_iter;
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struct btree_iter_set;
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struct bkey_float;
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#define MAX_BSETS 4U
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struct bset_tree {
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/*
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* We construct a binary tree in an array as if the array
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* started at 1, so that things line up on the same cachelines
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* better: see comments in bset.c at cacheline_to_bkey() for
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* details
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*/
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/* size of the binary tree and prev array */
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unsigned int size;
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/* function of size - precalculated for to_inorder() */
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unsigned int extra;
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/* copy of the last key in the set */
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struct bkey end;
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struct bkey_float *tree;
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/*
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* The nodes in the bset tree point to specific keys - this
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* array holds the sizes of the previous key.
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*
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* Conceptually it's a member of struct bkey_float, but we want
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* to keep bkey_float to 4 bytes and prev isn't used in the fast
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* path.
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*/
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uint8_t *prev;
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/* The actual btree node, with pointers to each sorted set */
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struct bset *data;
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};
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struct btree_keys_ops {
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bool (*sort_cmp)(struct btree_iter_set l,
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struct btree_iter_set r);
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struct bkey *(*sort_fixup)(struct btree_iter *iter,
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struct bkey *tmp);
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bool (*insert_fixup)(struct btree_keys *b,
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struct bkey *insert,
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struct btree_iter *iter,
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struct bkey *replace_key);
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bool (*key_invalid)(struct btree_keys *bk,
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const struct bkey *k);
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bool (*key_bad)(struct btree_keys *bk,
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const struct bkey *k);
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bool (*key_merge)(struct btree_keys *bk,
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struct bkey *l, struct bkey *r);
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void (*key_to_text)(char *buf,
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size_t size,
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const struct bkey *k);
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void (*key_dump)(struct btree_keys *keys,
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const struct bkey *k);
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/*
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* Only used for deciding whether to use START_KEY(k) or just the key
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* itself in a couple places
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*/
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bool is_extents;
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};
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struct btree_keys {
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const struct btree_keys_ops *ops;
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uint8_t page_order;
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uint8_t nsets;
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unsigned int last_set_unwritten:1;
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bool *expensive_debug_checks;
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/*
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* Sets of sorted keys - the real btree node - plus a binary search tree
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*
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* set[0] is special; set[0]->tree, set[0]->prev and set[0]->data point
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* to the memory we have allocated for this btree node. Additionally,
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* set[0]->data points to the entire btree node as it exists on disk.
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*/
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struct bset_tree set[MAX_BSETS];
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};
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static inline struct bset_tree *bset_tree_last(struct btree_keys *b)
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{
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return b->set + b->nsets;
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}
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static inline bool bset_written(struct btree_keys *b, struct bset_tree *t)
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{
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return t <= b->set + b->nsets - b->last_set_unwritten;
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}
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static inline bool bkey_written(struct btree_keys *b, struct bkey *k)
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{
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return !b->last_set_unwritten || k < b->set[b->nsets].data->start;
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}
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static inline unsigned int bset_byte_offset(struct btree_keys *b,
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struct bset *i)
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{
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return ((size_t) i) - ((size_t) b->set->data);
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}
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static inline unsigned int bset_sector_offset(struct btree_keys *b,
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struct bset *i)
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{
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return bset_byte_offset(b, i) >> 9;
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}
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#define __set_bytes(i, k) (sizeof(*(i)) + (k) * sizeof(uint64_t))
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#define set_bytes(i) __set_bytes(i, i->keys)
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#define __set_blocks(i, k, block_bytes) \
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DIV_ROUND_UP(__set_bytes(i, k), block_bytes)
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#define set_blocks(i, block_bytes) \
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__set_blocks(i, (i)->keys, block_bytes)
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static inline size_t bch_btree_keys_u64s_remaining(struct btree_keys *b)
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{
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struct bset_tree *t = bset_tree_last(b);
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BUG_ON((PAGE_SIZE << b->page_order) <
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(bset_byte_offset(b, t->data) + set_bytes(t->data)));
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if (!b->last_set_unwritten)
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return 0;
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return ((PAGE_SIZE << b->page_order) -
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(bset_byte_offset(b, t->data) + set_bytes(t->data))) /
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sizeof(u64);
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}
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static inline struct bset *bset_next_set(struct btree_keys *b,
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unsigned int block_bytes)
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{
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struct bset *i = bset_tree_last(b)->data;
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return ((void *) i) + roundup(set_bytes(i), block_bytes);
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}
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void bch_btree_keys_free(struct btree_keys *b);
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int bch_btree_keys_alloc(struct btree_keys *b, unsigned int page_order,
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gfp_t gfp);
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void bch_btree_keys_init(struct btree_keys *b, const struct btree_keys_ops *ops,
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bool *expensive_debug_checks);
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void bch_bset_init_next(struct btree_keys *b, struct bset *i, uint64_t magic);
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void bch_bset_build_written_tree(struct btree_keys *b);
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void bch_bset_fix_invalidated_key(struct btree_keys *b, struct bkey *k);
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bool bch_bkey_try_merge(struct btree_keys *b, struct bkey *l, struct bkey *r);
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void bch_bset_insert(struct btree_keys *b, struct bkey *where,
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struct bkey *insert);
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unsigned int bch_btree_insert_key(struct btree_keys *b, struct bkey *k,
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struct bkey *replace_key);
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enum {
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BTREE_INSERT_STATUS_NO_INSERT = 0,
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BTREE_INSERT_STATUS_INSERT,
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BTREE_INSERT_STATUS_BACK_MERGE,
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BTREE_INSERT_STATUS_OVERWROTE,
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BTREE_INSERT_STATUS_FRONT_MERGE,
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};
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/* Btree key iteration */
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struct btree_iter {
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size_t size, used;
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#ifdef CONFIG_BCACHE_DEBUG
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struct btree_keys *b;
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#endif
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struct btree_iter_set {
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struct bkey *k, *end;
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} data[MAX_BSETS];
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};
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typedef bool (*ptr_filter_fn)(struct btree_keys *b, const struct bkey *k);
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struct bkey *bch_btree_iter_next(struct btree_iter *iter);
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struct bkey *bch_btree_iter_next_filter(struct btree_iter *iter,
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struct btree_keys *b,
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ptr_filter_fn fn);
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void bch_btree_iter_push(struct btree_iter *iter, struct bkey *k,
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struct bkey *end);
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struct bkey *bch_btree_iter_init(struct btree_keys *b,
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struct btree_iter *iter,
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struct bkey *search);
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struct bkey *__bch_bset_search(struct btree_keys *b, struct bset_tree *t,
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const struct bkey *search);
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/*
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* Returns the first key that is strictly greater than search
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*/
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static inline struct bkey *bch_bset_search(struct btree_keys *b,
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struct bset_tree *t,
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const struct bkey *search)
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{
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return search ? __bch_bset_search(b, t, search) : t->data->start;
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}
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#define for_each_key_filter(b, k, iter, filter) \
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for (bch_btree_iter_init((b), (iter), NULL); \
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((k) = bch_btree_iter_next_filter((iter), (b), filter));)
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#define for_each_key(b, k, iter) \
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for (bch_btree_iter_init((b), (iter), NULL); \
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((k) = bch_btree_iter_next(iter));)
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/* Sorting */
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struct bset_sort_state {
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mempool_t pool;
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unsigned int page_order;
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unsigned int crit_factor;
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struct time_stats time;
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};
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void bch_bset_sort_state_free(struct bset_sort_state *state);
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int bch_bset_sort_state_init(struct bset_sort_state *state,
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unsigned int page_order);
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void bch_btree_sort_lazy(struct btree_keys *b, struct bset_sort_state *state);
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void bch_btree_sort_into(struct btree_keys *b, struct btree_keys *new,
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struct bset_sort_state *state);
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void bch_btree_sort_and_fix_extents(struct btree_keys *b,
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struct btree_iter *iter,
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struct bset_sort_state *state);
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void bch_btree_sort_partial(struct btree_keys *b, unsigned int start,
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struct bset_sort_state *state);
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static inline void bch_btree_sort(struct btree_keys *b,
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struct bset_sort_state *state)
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{
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bch_btree_sort_partial(b, 0, state);
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}
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struct bset_stats {
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size_t sets_written, sets_unwritten;
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size_t bytes_written, bytes_unwritten;
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size_t floats, failed;
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};
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void bch_btree_keys_stats(struct btree_keys *b, struct bset_stats *state);
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/* Bkey utility code */
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#define bset_bkey_last(i) bkey_idx((struct bkey *) (i)->d, \
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(unsigned int)(i)->keys)
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static inline struct bkey *bset_bkey_idx(struct bset *i, unsigned int idx)
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{
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return bkey_idx(i->start, idx);
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}
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static inline void bkey_init(struct bkey *k)
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{
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*k = ZERO_KEY;
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}
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static __always_inline int64_t bkey_cmp(const struct bkey *l,
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const struct bkey *r)
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{
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return unlikely(KEY_INODE(l) != KEY_INODE(r))
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? (int64_t) KEY_INODE(l) - (int64_t) KEY_INODE(r)
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: (int64_t) KEY_OFFSET(l) - (int64_t) KEY_OFFSET(r);
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}
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void bch_bkey_copy_single_ptr(struct bkey *dest, const struct bkey *src,
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unsigned int i);
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bool __bch_cut_front(const struct bkey *where, struct bkey *k);
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bool __bch_cut_back(const struct bkey *where, struct bkey *k);
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static inline bool bch_cut_front(const struct bkey *where, struct bkey *k)
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{
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BUG_ON(bkey_cmp(where, k) > 0);
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return __bch_cut_front(where, k);
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}
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static inline bool bch_cut_back(const struct bkey *where, struct bkey *k)
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{
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BUG_ON(bkey_cmp(where, &START_KEY(k)) < 0);
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return __bch_cut_back(where, k);
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}
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/*
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* Pointer '*preceding_key_p' points to a memory object to store preceding
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* key of k. If the preceding key does not exist, set '*preceding_key_p' to
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* NULL. So the caller of preceding_key() needs to take care of memory
|
|
* which '*preceding_key_p' pointed to before calling preceding_key().
|
|
* Currently the only caller of preceding_key() is bch_btree_insert_key(),
|
|
* and it points to an on-stack variable, so the memory release is handled
|
|
* by stackframe itself.
|
|
*/
|
|
static inline void preceding_key(struct bkey *k, struct bkey **preceding_key_p)
|
|
{
|
|
if (KEY_INODE(k) || KEY_OFFSET(k)) {
|
|
(**preceding_key_p) = KEY(KEY_INODE(k), KEY_OFFSET(k), 0);
|
|
if (!(*preceding_key_p)->low)
|
|
(*preceding_key_p)->high--;
|
|
(*preceding_key_p)->low--;
|
|
} else {
|
|
(*preceding_key_p) = NULL;
|
|
}
|
|
}
|
|
|
|
static inline bool bch_ptr_invalid(struct btree_keys *b, const struct bkey *k)
|
|
{
|
|
return b->ops->key_invalid(b, k);
|
|
}
|
|
|
|
static inline bool bch_ptr_bad(struct btree_keys *b, const struct bkey *k)
|
|
{
|
|
return b->ops->key_bad(b, k);
|
|
}
|
|
|
|
static inline void bch_bkey_to_text(struct btree_keys *b, char *buf,
|
|
size_t size, const struct bkey *k)
|
|
{
|
|
return b->ops->key_to_text(buf, size, k);
|
|
}
|
|
|
|
static inline bool bch_bkey_equal_header(const struct bkey *l,
|
|
const struct bkey *r)
|
|
{
|
|
return (KEY_DIRTY(l) == KEY_DIRTY(r) &&
|
|
KEY_PTRS(l) == KEY_PTRS(r) &&
|
|
KEY_CSUM(l) == KEY_CSUM(r));
|
|
}
|
|
|
|
/* Keylists */
|
|
|
|
struct keylist {
|
|
union {
|
|
struct bkey *keys;
|
|
uint64_t *keys_p;
|
|
};
|
|
union {
|
|
struct bkey *top;
|
|
uint64_t *top_p;
|
|
};
|
|
|
|
/* Enough room for btree_split's keys without realloc */
|
|
#define KEYLIST_INLINE 16
|
|
uint64_t inline_keys[KEYLIST_INLINE];
|
|
};
|
|
|
|
static inline void bch_keylist_init(struct keylist *l)
|
|
{
|
|
l->top_p = l->keys_p = l->inline_keys;
|
|
}
|
|
|
|
static inline void bch_keylist_init_single(struct keylist *l, struct bkey *k)
|
|
{
|
|
l->keys = k;
|
|
l->top = bkey_next(k);
|
|
}
|
|
|
|
static inline void bch_keylist_push(struct keylist *l)
|
|
{
|
|
l->top = bkey_next(l->top);
|
|
}
|
|
|
|
static inline void bch_keylist_add(struct keylist *l, struct bkey *k)
|
|
{
|
|
bkey_copy(l->top, k);
|
|
bch_keylist_push(l);
|
|
}
|
|
|
|
static inline bool bch_keylist_empty(struct keylist *l)
|
|
{
|
|
return l->top == l->keys;
|
|
}
|
|
|
|
static inline void bch_keylist_reset(struct keylist *l)
|
|
{
|
|
l->top = l->keys;
|
|
}
|
|
|
|
static inline void bch_keylist_free(struct keylist *l)
|
|
{
|
|
if (l->keys_p != l->inline_keys)
|
|
kfree(l->keys_p);
|
|
}
|
|
|
|
static inline size_t bch_keylist_nkeys(struct keylist *l)
|
|
{
|
|
return l->top_p - l->keys_p;
|
|
}
|
|
|
|
static inline size_t bch_keylist_bytes(struct keylist *l)
|
|
{
|
|
return bch_keylist_nkeys(l) * sizeof(uint64_t);
|
|
}
|
|
|
|
struct bkey *bch_keylist_pop(struct keylist *l);
|
|
void bch_keylist_pop_front(struct keylist *l);
|
|
int __bch_keylist_realloc(struct keylist *l, unsigned int u64s);
|
|
|
|
/* Debug stuff */
|
|
|
|
#ifdef CONFIG_BCACHE_DEBUG
|
|
|
|
int __bch_count_data(struct btree_keys *b);
|
|
void __printf(2, 3) __bch_check_keys(struct btree_keys *b,
|
|
const char *fmt,
|
|
...);
|
|
void bch_dump_bset(struct btree_keys *b, struct bset *i, unsigned int set);
|
|
void bch_dump_bucket(struct btree_keys *b);
|
|
|
|
#else
|
|
|
|
static inline int __bch_count_data(struct btree_keys *b) { return -1; }
|
|
static inline void __printf(2, 3)
|
|
__bch_check_keys(struct btree_keys *b, const char *fmt, ...) {}
|
|
static inline void bch_dump_bucket(struct btree_keys *b) {}
|
|
void bch_dump_bset(struct btree_keys *b, struct bset *i, unsigned int set);
|
|
|
|
#endif
|
|
|
|
static inline bool btree_keys_expensive_checks(struct btree_keys *b)
|
|
{
|
|
#ifdef CONFIG_BCACHE_DEBUG
|
|
return *b->expensive_debug_checks;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
static inline int bch_count_data(struct btree_keys *b)
|
|
{
|
|
return btree_keys_expensive_checks(b) ? __bch_count_data(b) : -1;
|
|
}
|
|
|
|
#define bch_check_keys(b, ...) \
|
|
do { \
|
|
if (btree_keys_expensive_checks(b)) \
|
|
__bch_check_keys(b, __VA_ARGS__); \
|
|
} while (0)
|
|
|
|
#endif
|