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Singh" , Neeraj Singh Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Neeraj Singh From: Neeraj Singh This commit introduces the `core.fsync` configuration knob which can be used to control how components of the repository are made durable on disk. This setting allows future extensibility of the list of syncable components: * We issue a warning rather than an error for unrecognized components, so new configs can be used with old Git versions. * We support negation, so users can choose one of the default aggregate options and then remove components that they don't want. The user would then harden any new components added in a Git version update. This also supports the common request of doing absolutely no fysncing with the `core.fsync=none` value, which is expected to make the test suite faster. Signed-off-by: Neeraj Singh --- Documentation/config/core.txt | 27 +++++++++---- builtin/fast-import.c | 2 +- builtin/index-pack.c | 4 +- builtin/pack-objects.c | 8 ++-- bulk-checkin.c | 5 ++- cache.h | 39 +++++++++++++++++- commit-graph.c | 3 +- config.c | 76 ++++++++++++++++++++++++++++++++++- csum-file.c | 5 ++- csum-file.h | 3 +- environment.c | 1 + midx.c | 3 +- object-file.c | 3 +- pack-bitmap-write.c | 3 +- pack-write.c | 13 +++--- read-cache.c | 2 +- 16 files changed, 164 insertions(+), 33 deletions(-) diff --git a/Documentation/config/core.txt b/Documentation/config/core.txt index dbb134f7136..4f1747ec871 100644 --- a/Documentation/config/core.txt +++ b/Documentation/config/core.txt @@ -547,6 +547,25 @@ core.whitespace:: is relevant for `indent-with-non-tab` and when Git fixes `tab-in-indent` errors. The default tab width is 8. Allowed values are 1 to 63. +core.fsync:: + A comma-separated list of parts of the repository which should be + hardened via the core.fsyncMethod when created or modified. You can + disable hardening of any component by prefixing it with a '-'. Later + items take precedence over earlier ones in the list. For example, + `core.fsync=all,-pack-metadata` means "harden everything except pack + metadata." Items that are not hardened may be lost in the event of an + unclean system shutdown. ++ +* `none` disables fsync completely. This must be specified alone. +* `loose-object` hardens objects added to the repo in loose-object form. +* `pack` hardens objects added to the repo in packfile form. +* `pack-metadata` hardens packfile bitmaps and indexes. +* `commit-graph` hardens the commit graph file. +* `objects` is an aggregate option that includes `loose-objects`, `pack`, + `pack-metadata`, and `commit-graph`. +* `default` is an aggregate option that is equivalent to `objects,-loose-object` +* `all` is an aggregate option that syncs all individual components above. + core.fsyncMethod:: A value indicating the strategy Git will use to harden repository data using fsync and related primitives. @@ -556,14 +575,6 @@ core.fsyncMethod:: filesystem and storage hardware, data added to the repository may not be durable in the event of a system crash. This is the default mode on macOS. -core.fsyncObjectFiles:: - This boolean will enable 'fsync()' when writing object files. -+ -This is a total waste of time and effort on a filesystem that orders -data writes properly, but can be useful for filesystems that do not use -journalling (traditional UNIX filesystems) or that only journal metadata -and not file contents (OS X's HFS+, or Linux ext3 with "data=writeback"). - core.preloadIndex:: Enable parallel index preload for operations like 'git diff' + diff --git a/builtin/fast-import.c b/builtin/fast-import.c index 20406f67754..e27a4580f85 100644 --- a/builtin/fast-import.c +++ b/builtin/fast-import.c @@ -856,7 +856,7 @@ static void end_packfile(void) struct tag *t; close_pack_windows(pack_data); - finalize_hashfile(pack_file, cur_pack_oid.hash, 0); + finalize_hashfile(pack_file, cur_pack_oid.hash, FSYNC_COMPONENT_PACK, 0); fixup_pack_header_footer(pack_data->pack_fd, pack_data->hash, pack_data->pack_name, object_count, cur_pack_oid.hash, pack_size); diff --git a/builtin/index-pack.c b/builtin/index-pack.c index c23d01de7dc..c32534c13b4 100644 --- a/builtin/index-pack.c +++ b/builtin/index-pack.c @@ -1286,7 +1286,7 @@ static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned cha nr_objects - nr_objects_initial); stop_progress_msg(&progress, msg.buf); strbuf_release(&msg); - finalize_hashfile(f, tail_hash, 0); + finalize_hashfile(f, tail_hash, FSYNC_COMPONENT_PACK, 0); hashcpy(read_hash, pack_hash); fixup_pack_header_footer(output_fd, pack_hash, curr_pack, nr_objects, @@ -1508,7 +1508,7 @@ static void final(const char *final_pack_name, const char *curr_pack_name, if (!from_stdin) { close(input_fd); } else { - fsync_or_die(output_fd, curr_pack_name); + fsync_component_or_die(FSYNC_COMPONENT_PACK, output_fd, curr_pack_name); err = close(output_fd); if (err) die_errno(_("error while closing pack file")); diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c index 857be7826f3..916c55d6ce9 100644 --- a/builtin/pack-objects.c +++ b/builtin/pack-objects.c @@ -1204,11 +1204,13 @@ static void write_pack_file(void) * If so, rewrite it like in fast-import */ if (pack_to_stdout) { - finalize_hashfile(f, hash, CSUM_HASH_IN_STREAM | CSUM_CLOSE); + finalize_hashfile(f, hash, FSYNC_COMPONENT_NONE, + CSUM_HASH_IN_STREAM | CSUM_CLOSE); } else if (nr_written == nr_remaining) { - finalize_hashfile(f, hash, CSUM_HASH_IN_STREAM | CSUM_FSYNC | CSUM_CLOSE); + finalize_hashfile(f, hash, FSYNC_COMPONENT_PACK, + CSUM_HASH_IN_STREAM | CSUM_FSYNC | CSUM_CLOSE); } else { - int fd = finalize_hashfile(f, hash, 0); + int fd = finalize_hashfile(f, hash, FSYNC_COMPONENT_PACK, 0); fixup_pack_header_footer(fd, hash, pack_tmp_name, nr_written, hash, offset); close(fd); diff --git a/bulk-checkin.c b/bulk-checkin.c index 8785b2ac806..a2cf9dcbc8d 100644 --- a/bulk-checkin.c +++ b/bulk-checkin.c @@ -53,9 +53,10 @@ static void finish_bulk_checkin(struct bulk_checkin_state *state) unlink(state->pack_tmp_name); goto clear_exit; } else if (state->nr_written == 1) { - finalize_hashfile(state->f, hash, CSUM_HASH_IN_STREAM | CSUM_FSYNC | CSUM_CLOSE); + finalize_hashfile(state->f, hash, FSYNC_COMPONENT_PACK, + CSUM_HASH_IN_STREAM | CSUM_FSYNC | CSUM_CLOSE); } else { - int fd = finalize_hashfile(state->f, hash, 0); + int fd = finalize_hashfile(state->f, hash, FSYNC_COMPONENT_PACK, 0); fixup_pack_header_footer(fd, hash, state->pack_tmp_name, state->nr_written, hash, state->offset); diff --git a/cache.h b/cache.h index 9cd60d94952..d83fbaf2619 100644 --- a/cache.h +++ b/cache.h @@ -985,7 +985,38 @@ void reset_shared_repository(void); extern int read_replace_refs; extern char *git_replace_ref_base; -extern int fsync_object_files; +/* + * These values are used to help identify parts of a repository to fsync. + * FSYNC_COMPONENT_NONE identifies data that will not be a persistent part of the + * repository and so shouldn't be fsynced. + */ +enum fsync_component { + FSYNC_COMPONENT_NONE = 0, + FSYNC_COMPONENT_LOOSE_OBJECT = 1 << 0, + FSYNC_COMPONENT_PACK = 1 << 1, + FSYNC_COMPONENT_PACK_METADATA = 1 << 2, + FSYNC_COMPONENT_COMMIT_GRAPH = 1 << 3, +}; + +#define FSYNC_COMPONENTS_DEFAULT (FSYNC_COMPONENT_PACK | \ + FSYNC_COMPONENT_PACK_METADATA | \ + FSYNC_COMPONENT_COMMIT_GRAPH) + +#define FSYNC_COMPONENTS_OBJECTS (FSYNC_COMPONENT_LOOSE_OBJECT | \ + FSYNC_COMPONENT_PACK | \ + FSYNC_COMPONENT_PACK_METADATA | \ + FSYNC_COMPONENT_COMMIT_GRAPH) + +#define FSYNC_COMPONENTS_ALL (FSYNC_COMPONENT_LOOSE_OBJECT | \ + FSYNC_COMPONENT_PACK | \ + FSYNC_COMPONENT_PACK_METADATA | \ + FSYNC_COMPONENT_COMMIT_GRAPH) + + +/* + * A bitmask indicating which components of the repo should be fsynced. + */ +extern enum fsync_component fsync_components; enum fsync_method { FSYNC_METHOD_FSYNC, @@ -1747,6 +1778,12 @@ int copy_file_with_time(const char *dst, const char *src, int mode); void write_or_die(int fd, const void *buf, size_t count); void fsync_or_die(int fd, const char *); +inline void fsync_component_or_die(enum fsync_component component, int fd, const char *msg) +{ + if (fsync_components & component) + fsync_or_die(fd, msg); +} + ssize_t read_in_full(int fd, void *buf, size_t count); ssize_t write_in_full(int fd, const void *buf, size_t count); ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset); diff --git a/commit-graph.c b/commit-graph.c index 2706683acfe..c8a5dea4541 100644 --- a/commit-graph.c +++ b/commit-graph.c @@ -1939,7 +1939,8 @@ static int write_commit_graph_file(struct write_commit_graph_context *ctx) } close_commit_graph(ctx->r->objects); - finalize_hashfile(f, file_hash, CSUM_HASH_IN_STREAM | CSUM_FSYNC); + finalize_hashfile(f, file_hash, FSYNC_COMPONENT_COMMIT_GRAPH, + CSUM_HASH_IN_STREAM | CSUM_FSYNC); free_chunkfile(cf); if (ctx->split) { diff --git a/config.c b/config.c index c3410b8a868..29c867aab03 100644 --- a/config.c +++ b/config.c @@ -1213,6 +1213,73 @@ static int git_parse_maybe_bool_text(const char *value) return -1; } +static const struct fsync_component_entry { + const char *name; + enum fsync_component component_bits; +} fsync_component_table[] = { + { "loose-object", FSYNC_COMPONENT_LOOSE_OBJECT }, + { "pack", FSYNC_COMPONENT_PACK }, + { "pack-metadata", FSYNC_COMPONENT_PACK_METADATA }, + { "commit-graph", FSYNC_COMPONENT_COMMIT_GRAPH }, + { "objects", FSYNC_COMPONENTS_OBJECTS }, + { "default", FSYNC_COMPONENTS_DEFAULT }, + { "all", FSYNC_COMPONENTS_ALL }, +}; + +static enum fsync_component parse_fsync_components(const char *var, const char *string) +{ + enum fsync_component output = 0; + + if (!strcmp(string, "none")) + return output; + + while (string) { + int i; + size_t len; + const char *ep; + int negated = 0; + int found = 0; + + string = string + strspn(string, ", \t\n\r"); + ep = strchrnul(string, ','); + len = ep - string; + + if (*string == '-') { + negated = 1; + string++; + len--; + if (!len) + warning(_("invalid value for variable %s"), var); + } + + if (!len) + break; + + for (i = 0; i < ARRAY_SIZE(fsync_component_table); ++i) { + const struct fsync_component_entry *entry = &fsync_component_table[i]; + + if (strncmp(entry->name, string, len)) + continue; + + found = 1; + if (negated) + output &= ~entry->component_bits; + else + output |= entry->component_bits; + } + + if (!found) { + char *component = xstrndup(string, len); + warning(_("unknown %s value '%s'"), var, component); + free(component); + } + + string = ep; + } + + return output; +} + int git_parse_maybe_bool(const char *value) { int v = git_parse_maybe_bool_text(value); @@ -1490,6 +1557,13 @@ static int git_default_core_config(const char *var, const char *value, void *cb) return 0; } + if (!strcmp(var, "core.fsync")) { + if (!value) + return config_error_nonbool(var); + fsync_components = parse_fsync_components(var, value); + return 0; + } + if (!strcmp(var, "core.fsyncmethod")) { if (!value) return config_error_nonbool(var); @@ -1503,7 +1577,7 @@ static int git_default_core_config(const char *var, const char *value, void *cb) } if (!strcmp(var, "core.fsyncobjectfiles")) { - fsync_object_files = git_config_bool(var, value); + warning(_("core.fsyncobjectfiles is deprecated; use core.fsync instead")); return 0; } diff --git a/csum-file.c b/csum-file.c index 26e8a6df44e..59ef3398ca2 100644 --- a/csum-file.c +++ b/csum-file.c @@ -58,7 +58,8 @@ static void free_hashfile(struct hashfile *f) free(f); } -int finalize_hashfile(struct hashfile *f, unsigned char *result, unsigned int flags) +int finalize_hashfile(struct hashfile *f, unsigned char *result, + enum fsync_component component, unsigned int flags) { int fd; @@ -69,7 +70,7 @@ int finalize_hashfile(struct hashfile *f, unsigned char *result, unsigned int fl if (flags & CSUM_HASH_IN_STREAM) flush(f, f->buffer, the_hash_algo->rawsz); if (flags & CSUM_FSYNC) - fsync_or_die(f->fd, f->name); + fsync_component_or_die(component, f->fd, f->name); if (flags & CSUM_CLOSE) { if (close(f->fd)) die_errno("%s: sha1 file error on close", f->name); diff --git a/csum-file.h b/csum-file.h index 291215b34eb..0d29f528fbc 100644 --- a/csum-file.h +++ b/csum-file.h @@ -1,6 +1,7 @@ #ifndef CSUM_FILE_H #define CSUM_FILE_H +#include "cache.h" #include "hash.h" struct progress; @@ -38,7 +39,7 @@ int hashfile_truncate(struct hashfile *, struct hashfile_checkpoint *); struct hashfile *hashfd(int fd, const char *name); struct hashfile *hashfd_check(const char *name); struct hashfile *hashfd_throughput(int fd, const char *name, struct progress *tp); -int finalize_hashfile(struct hashfile *, unsigned char *, unsigned int); +int finalize_hashfile(struct hashfile *, unsigned char *, enum fsync_component, unsigned int); void hashwrite(struct hashfile *, const void *, unsigned int); void hashflush(struct hashfile *f); void crc32_begin(struct hashfile *); diff --git a/environment.c b/environment.c index f9140e842cf..09905adecf9 100644 --- a/environment.c +++ b/environment.c @@ -42,6 +42,7 @@ const char *git_hooks_path; int zlib_compression_level = Z_BEST_SPEED; int pack_compression_level = Z_DEFAULT_COMPRESSION; enum fsync_method fsync_method = FSYNC_METHOD_DEFAULT; +enum fsync_component fsync_components = FSYNC_COMPONENTS_DEFAULT; size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE; size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT; size_t delta_base_cache_limit = 96 * 1024 * 1024; diff --git a/midx.c b/midx.c index 837b46b2af5..882f91f7d57 100644 --- a/midx.c +++ b/midx.c @@ -1406,7 +1406,8 @@ static int write_midx_internal(const char *object_dir, write_midx_header(f, get_num_chunks(cf), ctx.nr - dropped_packs); write_chunkfile(cf, &ctx); - finalize_hashfile(f, midx_hash, CSUM_FSYNC | CSUM_HASH_IN_STREAM); + finalize_hashfile(f, midx_hash, FSYNC_COMPONENT_PACK_METADATA, + CSUM_FSYNC | CSUM_HASH_IN_STREAM); free_chunkfile(cf); if (flags & (MIDX_WRITE_REV_INDEX | MIDX_WRITE_BITMAP)) diff --git a/object-file.c b/object-file.c index eb972cdccd2..9d9c4a39e85 100644 --- a/object-file.c +++ b/object-file.c @@ -1809,8 +1809,7 @@ int hash_object_file(const struct git_hash_algo *algo, const void *buf, /* Finalize a file on disk, and close it. */ static void close_loose_object(int fd) { - if (fsync_object_files) - fsync_or_die(fd, "loose object file"); + fsync_component_or_die(FSYNC_COMPONENT_LOOSE_OBJECT, fd, "loose object file"); if (close(fd) != 0) die_errno(_("error when closing loose object file")); } diff --git a/pack-bitmap-write.c b/pack-bitmap-write.c index 9c55c1531e1..c16e43d1669 100644 --- a/pack-bitmap-write.c +++ b/pack-bitmap-write.c @@ -719,7 +719,8 @@ void bitmap_writer_finish(struct pack_idx_entry **index, if (options & BITMAP_OPT_HASH_CACHE) write_hash_cache(f, index, index_nr); - finalize_hashfile(f, NULL, CSUM_HASH_IN_STREAM | CSUM_FSYNC | CSUM_CLOSE); + finalize_hashfile(f, NULL, FSYNC_COMPONENT_PACK_METADATA, + CSUM_HASH_IN_STREAM | CSUM_FSYNC | CSUM_CLOSE); if (adjust_shared_perm(tmp_file.buf)) die_errno("unable to make temporary bitmap file readable"); diff --git a/pack-write.c b/pack-write.c index a5846f3a346..51812cb1299 100644 --- a/pack-write.c +++ b/pack-write.c @@ -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) diff --git a/read-cache.c b/read-cache.c index f3986596623..f3539681f49 100644 --- a/read-cache.c +++ b/read-cache.c @@ -3060,7 +3060,7 @@ static int do_write_index(struct index_state *istate, struct tempfile *tempfile, return -1; } - finalize_hashfile(f, istate->oid.hash, CSUM_HASH_IN_STREAM); + finalize_hashfile(f, istate->oid.hash, FSYNC_COMPONENT_NONE, CSUM_HASH_IN_STREAM); if (close_tempfile_gently(tempfile)) { error(_("could not close '%s'"), get_tempfile_path(tempfile)); return -1;