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core.fsync: introduce granular fsync control infrastructure

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This commit introduces the infrastructure for the core.fsync
configuration knob. The repository components we want to sync
are identified by flags so that we can turn on or off syncing
for specific components.

If core.fsyncObjectFiles is set and the core.fsync configuration
also includes FSYNC_COMPONENT_LOOSE_OBJECT, we will fsync any
loose objects. This picks the strictest data integrity behavior
if core.fsync and core.fsyncObjectFiles are set to conflicting values.

This change introduces the currently unused fsync_component
helper, which will be used by a later patch that adds fsyncing to
the refs backend.

Actual configuration and documentation of the fsync components
list are in other patches in the series to separate review of
the underlying mechanism from the policy of how it's configured.

Helped-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Neeraj Singh <neerajsi@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Neeraj Singh
2022-03-10 22:43:21 +00:00
committed by Junio C Hamano
parent abf38abec2
commit 020406eaa5
15 changed files with 97 additions and 33 deletions
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13
pack-write.c
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@ -159,9 +159,9 @@ const char *write_idx_file(const char *index_name, struct pack_idx_entry **objec
}
hashwrite(f, sha1, the_hash_algo->rawsz);
finalize_hashfile(f, NULL, CSUM_HASH_IN_STREAM | CSUM_CLOSE |
((opts->flags & WRITE_IDX_VERIFY)
? 0 : CSUM_FSYNC));
finalize_hashfile(f, NULL, FSYNC_COMPONENT_PACK_METADATA,
CSUM_HASH_IN_STREAM | CSUM_CLOSE |
((opts->flags & WRITE_IDX_VERIFY) ? 0 : CSUM_FSYNC));
return index_name;
}
@ -281,8 +281,9 @@ const char *write_rev_file_order(const char *rev_name,
if (rev_name && adjust_shared_perm(rev_name) < 0)
die(_("failed to make %s readable"), rev_name);
finalize_hashfile(f, NULL, CSUM_HASH_IN_STREAM | CSUM_CLOSE |
((flags & WRITE_IDX_VERIFY) ? 0 : CSUM_FSYNC));
finalize_hashfile(f, NULL, FSYNC_COMPONENT_PACK_METADATA,
CSUM_HASH_IN_STREAM | CSUM_CLOSE |
((flags & WRITE_IDX_VERIFY) ? 0 : CSUM_FSYNC));
return rev_name;
}
@ -390,7 +391,7 @@ void fixup_pack_header_footer(int pack_fd,
the_hash_algo->final_fn(partial_pack_hash, &old_hash_ctx);
the_hash_algo->final_fn(new_pack_hash, &new_hash_ctx);
write_or_die(pack_fd, new_pack_hash, the_hash_algo->rawsz);
fsync_or_die(pack_fd, pack_name);
fsync_component_or_die(FSYNC_COMPONENT_PACK, pack_fd, pack_name);
}
char *index_pack_lockfile(int ip_out, int *is_well_formed)