mirror of
https://github.com/git/git.git
synced 2024-05-06 16:56:13 +02:00
e8c58f894b
Add a new option that unconditionally enables the pack.writeReverseIndex setting in order to run the whole test suite in a mode that generates on-disk reverse indexes. Additionally, enable this mode in the second run of tests under linux-gcc in 'ci/run-build-and-tests.sh'. Once on-disk reverse indexes are proven out over several releases, we can change the default value of that configuration to 'true', and drop this patch. Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
#ifndef PACK_REVINDEX_H
|
|
#define PACK_REVINDEX_H
|
|
|
|
/**
|
|
* A revindex allows converting efficiently between three properties
|
|
* of an object within a pack:
|
|
*
|
|
* - index position: the numeric position within the list of sorted object ids
|
|
* found in the .idx file
|
|
*
|
|
* - pack position: the numeric position within the list of objects in their
|
|
* order within the actual .pack file (i.e., 0 is the first object in the
|
|
* .pack, 1 is the second, and so on)
|
|
*
|
|
* - offset: the byte offset within the .pack file at which the object contents
|
|
* can be found
|
|
*/
|
|
|
|
|
|
#define RIDX_SIGNATURE 0x52494458 /* "RIDX" */
|
|
#define RIDX_VERSION 1
|
|
|
|
#define GIT_TEST_WRITE_REV_INDEX "GIT_TEST_WRITE_REV_INDEX"
|
|
|
|
struct packed_git;
|
|
|
|
/*
|
|
* load_pack_revindex populates the revindex's internal data-structures for the
|
|
* given pack, returning zero on success and a negative value otherwise.
|
|
*
|
|
* If a '.rev' file is present it is mmap'd, and pointers are assigned into it
|
|
* (instead of using the in-memory variant).
|
|
*/
|
|
int load_pack_revindex(struct packed_git *p);
|
|
|
|
/*
|
|
* offset_to_pack_pos converts an object offset to a pack position. This
|
|
* function returns zero on success, and a negative number otherwise. The
|
|
* parameter 'pos' is usable only on success.
|
|
*
|
|
* If the reverse index has not yet been loaded, this function loads it lazily,
|
|
* and returns an negative number if an error was encountered.
|
|
*
|
|
* This function runs in time O(log N) with the number of objects in the pack.
|
|
*/
|
|
int offset_to_pack_pos(struct packed_git *p, off_t ofs, uint32_t *pos);
|
|
|
|
/*
|
|
* pack_pos_to_index converts the given pack-relative position 'pos' by
|
|
* returning an index-relative position.
|
|
*
|
|
* If the reverse index has not yet been loaded, or the position is out of
|
|
* bounds, this function aborts.
|
|
*
|
|
* This function runs in constant time.
|
|
*/
|
|
uint32_t pack_pos_to_index(struct packed_git *p, uint32_t pos);
|
|
|
|
/*
|
|
* pack_pos_to_offset converts the given pack-relative position 'pos' into a
|
|
* pack offset. For a pack with 'N' objects, asking for position 'N' will return
|
|
* the total size (in bytes) of the pack.
|
|
*
|
|
* If the reverse index has not yet been loaded, or the position is out of
|
|
* bounds, this function aborts.
|
|
*
|
|
* This function runs in constant time under both in-memory and on-disk reverse
|
|
* indexes, but an additional step is taken to consult the corresponding .idx
|
|
* file when using the on-disk format.
|
|
*/
|
|
off_t pack_pos_to_offset(struct packed_git *p, uint32_t pos);
|
|
|
|
#endif
|