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6dfa10ab22
gcc 10 seems to complain about array bounds in situations where gcc 11 does not - curious. This unfortunately requires adding some casts for now; we may investigate getting rid of our __u64 _data[] VLA in a future patch so that our start[0] members can be VLAs. Reported-by: John Stoffel <john@stoffel.org> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
338 lines
9.8 KiB
C
338 lines
9.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_BTREE_UPDATE_INTERIOR_H
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#define _BCACHEFS_BTREE_UPDATE_INTERIOR_H
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#include "btree_cache.h"
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#include "btree_locking.h"
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#include "btree_update.h"
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void __bch2_btree_calc_format(struct bkey_format_state *, struct btree *);
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bool bch2_btree_node_format_fits(struct bch_fs *c, struct btree *,
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struct bkey_format *);
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#define BTREE_UPDATE_NODES_MAX ((BTREE_MAX_DEPTH - 2) * 2 + GC_MERGE_NODES)
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#define BTREE_UPDATE_JOURNAL_RES (BTREE_UPDATE_NODES_MAX * (BKEY_BTREE_PTR_U64s_MAX + 1))
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/*
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* Tracks an in progress split/rewrite of a btree node and the update to the
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* parent node:
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*
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* When we split/rewrite a node, we do all the updates in memory without
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* waiting for any writes to complete - we allocate the new node(s) and update
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* the parent node, possibly recursively up to the root.
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*
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* The end result is that we have one or more new nodes being written -
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* possibly several, if there were multiple splits - and then a write (updating
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* an interior node) which will make all these new nodes visible.
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*
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* Additionally, as we split/rewrite nodes we free the old nodes - but the old
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* nodes can't be freed (their space on disk can't be reclaimed) until the
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* update to the interior node that makes the new node visible completes -
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* until then, the old nodes are still reachable on disk.
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*
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*/
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struct btree_update {
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struct closure cl;
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struct bch_fs *c;
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u64 start_time;
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struct list_head list;
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struct list_head unwritten_list;
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/* What kind of update are we doing? */
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enum {
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BTREE_INTERIOR_NO_UPDATE,
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BTREE_INTERIOR_UPDATING_NODE,
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BTREE_INTERIOR_UPDATING_ROOT,
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BTREE_INTERIOR_UPDATING_AS,
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} mode;
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unsigned nodes_written:1;
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unsigned took_gc_lock:1;
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enum btree_id btree_id;
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unsigned update_level;
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struct disk_reservation disk_res;
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struct journal_preres journal_preres;
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/*
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* BTREE_INTERIOR_UPDATING_NODE:
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* The update that made the new nodes visible was a regular update to an
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* existing interior node - @b. We can't write out the update to @b
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* until the new nodes we created are finished writing, so we block @b
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* from writing by putting this btree_interior update on the
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* @b->write_blocked list with @write_blocked_list:
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*/
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struct btree *b;
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struct list_head write_blocked_list;
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/*
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* We may be freeing nodes that were dirty, and thus had journal entries
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* pinned: we need to transfer the oldest of those pins to the
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* btree_update operation, and release it when the new node(s)
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* are all persistent and reachable:
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*/
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struct journal_entry_pin journal;
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/* Preallocated nodes we reserve when we start the update: */
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struct prealloc_nodes {
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struct btree *b[BTREE_UPDATE_NODES_MAX];
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unsigned nr;
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} prealloc_nodes[2];
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/* Nodes being freed: */
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struct keylist old_keys;
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u64 _old_keys[BTREE_UPDATE_NODES_MAX *
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BKEY_BTREE_PTR_U64s_MAX];
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/* Nodes being added: */
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struct keylist new_keys;
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u64 _new_keys[BTREE_UPDATE_NODES_MAX *
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BKEY_BTREE_PTR_U64s_MAX];
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/* New nodes, that will be made reachable by this update: */
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struct btree *new_nodes[BTREE_UPDATE_NODES_MAX];
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unsigned nr_new_nodes;
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struct btree *old_nodes[BTREE_UPDATE_NODES_MAX];
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__le64 old_nodes_seq[BTREE_UPDATE_NODES_MAX];
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unsigned nr_old_nodes;
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open_bucket_idx_t open_buckets[BTREE_UPDATE_NODES_MAX *
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BCH_REPLICAS_MAX];
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open_bucket_idx_t nr_open_buckets;
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unsigned journal_u64s;
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u64 journal_entries[BTREE_UPDATE_JOURNAL_RES];
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/* Only here to reduce stack usage on recursive splits: */
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struct keylist parent_keys;
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/*
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* Enough room for btree_split's keys without realloc - btree node
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* pointers never have crc/compression info, so we only need to acount
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* for the pointers for three keys
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*/
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u64 inline_keys[BKEY_BTREE_PTR_U64s_MAX * 3];
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};
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struct btree *__bch2_btree_node_alloc_replacement(struct btree_update *,
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struct btree_trans *,
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struct btree *,
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struct bkey_format);
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int bch2_btree_split_leaf(struct btree_trans *, struct btree_path *, unsigned);
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int __bch2_foreground_maybe_merge(struct btree_trans *, struct btree_path *,
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unsigned, unsigned, enum btree_node_sibling);
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static inline int bch2_foreground_maybe_merge_sibling(struct btree_trans *trans,
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struct btree_path *path,
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unsigned level, unsigned flags,
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enum btree_node_sibling sib)
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{
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struct btree *b;
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EBUG_ON(!btree_node_locked(path, level));
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b = path->l[level].b;
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if (b->sib_u64s[sib] > trans->c->btree_foreground_merge_threshold)
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return 0;
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return __bch2_foreground_maybe_merge(trans, path, level, flags, sib);
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}
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static inline int bch2_foreground_maybe_merge(struct btree_trans *trans,
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struct btree_path *path,
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unsigned level,
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unsigned flags)
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{
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return bch2_foreground_maybe_merge_sibling(trans, path, level, flags,
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btree_prev_sib) ?:
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bch2_foreground_maybe_merge_sibling(trans, path, level, flags,
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btree_next_sib);
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}
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int bch2_btree_node_rewrite(struct btree_trans *, struct btree_iter *,
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struct btree *, unsigned);
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void bch2_btree_node_rewrite_async(struct bch_fs *, struct btree *);
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int bch2_btree_node_update_key(struct btree_trans *, struct btree_iter *,
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struct btree *, struct bkey_i *,
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unsigned, bool);
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int bch2_btree_node_update_key_get_iter(struct btree_trans *, struct btree *,
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struct bkey_i *, unsigned, bool);
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void bch2_btree_set_root_for_read(struct bch_fs *, struct btree *);
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void bch2_btree_root_alloc(struct bch_fs *, enum btree_id);
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static inline unsigned btree_update_reserve_required(struct bch_fs *c,
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struct btree *b)
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{
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unsigned depth = btree_node_root(c, b)->c.level + 1;
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/*
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* Number of nodes we might have to allocate in a worst case btree
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* split operation - we split all the way up to the root, then allocate
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* a new root, unless we're already at max depth:
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*/
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if (depth < BTREE_MAX_DEPTH)
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return (depth - b->c.level) * 2 + 1;
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else
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return (depth - b->c.level) * 2 - 1;
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}
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static inline void btree_node_reset_sib_u64s(struct btree *b)
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{
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b->sib_u64s[0] = b->nr.live_u64s;
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b->sib_u64s[1] = b->nr.live_u64s;
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}
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static inline void *btree_data_end(struct bch_fs *c, struct btree *b)
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{
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return (void *) b->data + btree_bytes(c);
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}
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static inline struct bkey_packed *unwritten_whiteouts_start(struct bch_fs *c,
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struct btree *b)
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{
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return (void *) ((u64 *) btree_data_end(c, b) - b->whiteout_u64s);
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}
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static inline struct bkey_packed *unwritten_whiteouts_end(struct bch_fs *c,
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struct btree *b)
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{
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return btree_data_end(c, b);
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}
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static inline void *write_block(struct btree *b)
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{
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return (void *) b->data + (b->written << 9);
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}
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static inline bool __btree_addr_written(struct btree *b, void *p)
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{
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return p < write_block(b);
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}
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static inline bool bset_written(struct btree *b, struct bset *i)
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{
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return __btree_addr_written(b, i);
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}
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static inline bool bkey_written(struct btree *b, struct bkey_packed *k)
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{
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return __btree_addr_written(b, k);
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}
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static inline ssize_t __bch_btree_u64s_remaining(struct bch_fs *c,
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struct btree *b,
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void *end)
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{
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ssize_t used = bset_byte_offset(b, end) / sizeof(u64) +
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b->whiteout_u64s;
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ssize_t total = c->opts.btree_node_size >> 3;
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/* Always leave one extra u64 for bch2_varint_decode: */
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used++;
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return total - used;
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}
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static inline size_t bch_btree_keys_u64s_remaining(struct bch_fs *c,
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struct btree *b)
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{
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ssize_t remaining = __bch_btree_u64s_remaining(c, b,
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btree_bkey_last(b, bset_tree_last(b)));
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BUG_ON(remaining < 0);
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if (bset_written(b, btree_bset_last(b)))
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return 0;
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return remaining;
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}
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#define BTREE_WRITE_SET_U64s_BITS 9
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static inline unsigned btree_write_set_buffer(struct btree *b)
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{
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/*
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* Could buffer up larger amounts of keys for btrees with larger keys,
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* pending benchmarking:
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*/
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return 8 << BTREE_WRITE_SET_U64s_BITS;
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}
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static inline struct btree_node_entry *want_new_bset(struct bch_fs *c,
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struct btree *b)
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{
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struct bset_tree *t = bset_tree_last(b);
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struct btree_node_entry *bne = max(write_block(b),
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(void *) btree_bkey_last(b, bset_tree_last(b)));
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ssize_t remaining_space =
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__bch_btree_u64s_remaining(c, b, bne->keys.start);
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if (unlikely(bset_written(b, bset(b, t)))) {
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if (remaining_space > (ssize_t) (block_bytes(c) >> 3))
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return bne;
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} else {
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if (unlikely(bset_u64s(t) * sizeof(u64) > btree_write_set_buffer(b)) &&
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remaining_space > (ssize_t) (btree_write_set_buffer(b) >> 3))
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return bne;
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}
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return NULL;
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}
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static inline void push_whiteout(struct bch_fs *c, struct btree *b,
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struct bpos pos)
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{
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struct bkey_packed k;
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BUG_ON(bch_btree_keys_u64s_remaining(c, b) < BKEY_U64s);
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EBUG_ON(btree_node_just_written(b));
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if (!bkey_pack_pos(&k, pos, b)) {
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struct bkey *u = (void *) &k;
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bkey_init(u);
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u->p = pos;
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}
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k.needs_whiteout = true;
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b->whiteout_u64s += k.u64s;
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bkey_copy(unwritten_whiteouts_start(c, b), &k);
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}
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/*
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* write lock must be held on @b (else the dirty bset that we were going to
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* insert into could be written out from under us)
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*/
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static inline bool bch2_btree_node_insert_fits(struct bch_fs *c,
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struct btree *b, unsigned u64s)
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{
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if (unlikely(btree_node_need_rewrite(b)))
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return false;
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return u64s <= bch_btree_keys_u64s_remaining(c, b);
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}
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void bch2_btree_updates_to_text(struct printbuf *, struct bch_fs *);
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bool bch2_btree_interior_updates_flush(struct bch_fs *);
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void bch2_journal_entry_to_btree_root(struct bch_fs *, struct jset_entry *);
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struct jset_entry *bch2_btree_roots_to_journal_entries(struct bch_fs *,
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struct jset_entry *, struct jset_entry *);
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void bch2_do_pending_node_rewrites(struct bch_fs *);
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void bch2_free_pending_node_rewrites(struct bch_fs *);
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void bch2_fs_btree_interior_update_exit(struct bch_fs *);
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void bch2_fs_btree_interior_update_init_early(struct bch_fs *);
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int bch2_fs_btree_interior_update_init(struct bch_fs *);
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#endif /* _BCACHEFS_BTREE_UPDATE_INTERIOR_H */
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