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When split-index is being used, we have two cache_entry arrays in index_state->cache[] and index_state->split_index->base->cache[]. index_state->cache[] may share the same entries with base->cache[] so we can quickly determine what entries are shared. This makes memory management tricky, we can't free base->cache[] until we know index_state->cache[] does not point to any of those entries. unshare_split_index() is added for this purpose, to find shared entries and either duplicate them in index_state->cache[], or discard them. Either way it should be safe to free base->cache[] after unshare_split_index(). Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
#ifndef SPLIT_INDEX_H
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#define SPLIT_INDEX_H
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struct index_state;
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struct strbuf;
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struct ewah_bitmap;
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struct split_index {
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unsigned char base_sha1[20];
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struct index_state *base;
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struct ewah_bitmap *delete_bitmap;
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struct ewah_bitmap *replace_bitmap;
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struct cache_entry **saved_cache;
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unsigned int saved_cache_nr;
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unsigned int nr_deletions;
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unsigned int nr_replacements;
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int refcount;
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};
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struct split_index *init_split_index(struct index_state *istate);
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void save_or_free_index_entry(struct index_state *istate, struct cache_entry *ce);
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void replace_index_entry_in_base(struct index_state *istate,
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struct cache_entry *old,
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struct cache_entry *new);
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int read_link_extension(struct index_state *istate,
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const void *data, unsigned long sz);
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int write_link_extension(struct strbuf *sb,
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struct index_state *istate);
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void move_cache_to_base_index(struct index_state *istate);
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void merge_base_index(struct index_state *istate);
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void prepare_to_write_split_index(struct index_state *istate);
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void finish_writing_split_index(struct index_state *istate);
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void discard_split_index(struct index_state *istate);
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void add_split_index(struct index_state *istate);
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void remove_split_index(struct index_state *istate);
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void unshare_split_index(struct index_state *istate, int discard);
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#endif
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