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f81e97d047
Now that simplehash can be used in frontend code, let's make use of it. Reviewed-by: Kyotaro Horiguchi, Soumyadeep Chakraborty Discussion: https://www.postgresql.org/message-id/0c5b3783-af52-3ee5-f8fa-6e794061f70d%40iki.fi
114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* filemap.h
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*
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* Copyright (c) 2013-2020, PostgreSQL Global Development Group
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*-------------------------------------------------------------------------
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*/
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#ifndef FILEMAP_H
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#define FILEMAP_H
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#include "datapagemap.h"
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#include "storage/block.h"
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#include "storage/relfilenode.h"
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/* these enum values are sorted in the order we want actions to be processed */
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typedef enum
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{
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FILE_ACTION_UNDECIDED = 0, /* not decided yet */
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FILE_ACTION_CREATE, /* create local directory or symbolic link */
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FILE_ACTION_COPY, /* copy whole file, overwriting if exists */
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FILE_ACTION_COPY_TAIL, /* copy tail from 'source_size' to
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* 'target_size' */
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FILE_ACTION_NONE, /* no action (we might still copy modified
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* blocks based on the parsed WAL) */
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FILE_ACTION_TRUNCATE, /* truncate local file to 'newsize' bytes */
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FILE_ACTION_REMOVE /* remove local file / directory / symlink */
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} file_action_t;
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typedef enum
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{
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FILE_TYPE_UNDEFINED = 0,
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FILE_TYPE_REGULAR,
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FILE_TYPE_DIRECTORY,
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FILE_TYPE_SYMLINK
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} file_type_t;
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/*
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* For every file found in the local or remote system, we have a file entry
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* that contains information about the file on both systems. For relation
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* files, there is also a page map that marks pages in the file that were
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* changed in the target after the last common checkpoint.
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*
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* When gathering information, these are kept in a hash table, private to
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* filemap.c. decide_file_actions() fills in the 'action' field, sorts all
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* the entries, and returns them in an array, ready for executing the actions.
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*/
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typedef struct file_entry_t
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{
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uint32 status; /* hash status */
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const char *path;
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bool isrelfile; /* is it a relation data file? */
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/*
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* Status of the file in the target.
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*/
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bool target_exists;
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file_type_t target_type;
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size_t target_size; /* for a regular file */
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char *target_link_target; /* for a symlink */
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/*
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* Pages that were modified in the target and need to be replaced from the
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* source.
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*/
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datapagemap_t target_pages_to_overwrite;
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/*
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* Status of the file in the source.
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*/
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bool source_exists;
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file_type_t source_type;
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size_t source_size;
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char *source_link_target; /* for a symlink */
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/*
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* What will we do to the file?
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*/
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file_action_t action;
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} file_entry_t;
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/*
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* This contains the final decisions on what to do with each file.
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* 'entries' array contains an entry for each file, sorted in the order
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* that their actions should executed.
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*/
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typedef struct filemap_t
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{
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/* Summary information, filled by calculate_totals() */
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uint64 total_size; /* total size of the source cluster */
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uint64 fetch_size; /* number of bytes that needs to be copied */
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int nentries; /* size of 'entries' array */
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file_entry_t *entries[FLEXIBLE_ARRAY_MEMBER];
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} filemap_t;
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/* Functions for populating the filemap */
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extern void filehash_init(void);
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extern void process_source_file(const char *path, file_type_t type,
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size_t size, const char *link_target);
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extern void process_target_file(const char *path, file_type_t type,
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size_t size, const char *link_target);
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extern void process_target_wal_block_change(ForkNumber forknum,
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RelFileNode rnode,
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BlockNumber blkno);
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extern filemap_t *decide_file_actions(void);
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extern void calculate_totals(filemap_t *filemap);
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extern void print_filemap(filemap_t *filemap);
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#endif /* FILEMAP_H */
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