diff options
Diffstat (limited to 'read-cache.c')
-rw-r--r-- | read-cache.c | 194 |
1 files changed, 164 insertions, 30 deletions
diff --git a/read-cache.c b/read-cache.c index 248432a..e447751 100644 --- a/read-cache.c +++ b/read-cache.c @@ -156,12 +156,12 @@ void fill_stat_cache_info(struct cache_entry *ce, struct stat *st) static int ce_compare_data(const struct cache_entry *ce, struct stat *st) { int match = -1; - int fd = open(ce->name, O_RDONLY); + int fd = git_open_cloexec(ce->name, O_RDONLY); if (fd >= 0) { unsigned char sha1[20]; if (!index_fd(sha1, fd, st, OBJ_BLOB, ce->name, 0)) - match = hashcmp(sha1, ce->sha1); + match = hashcmp(sha1, ce->oid.hash); /* index_fd() closed the file descriptor already */ } return match; @@ -178,7 +178,7 @@ static int ce_compare_link(const struct cache_entry *ce, size_t expected_size) if (strbuf_readlink(&sb, ce->name, expected_size)) return -1; - buffer = read_sha1_file(ce->sha1, &type, &size); + buffer = read_sha1_file(ce->oid.hash, &type, &size); if (buffer) { if (size == sb.len) match = memcmp(buffer, sb.buf, size); @@ -202,7 +202,7 @@ static int ce_compare_gitlink(const struct cache_entry *ce) */ if (resolve_gitlink_ref(ce->name, "HEAD", sha1) < 0) return 0; - return hashcmp(sha1, ce->sha1); + return hashcmp(sha1, ce->oid.hash); } static int ce_modified_check_fs(const struct cache_entry *ce, struct stat *st) @@ -262,7 +262,7 @@ static int ce_match_stat_basic(const struct cache_entry *ce, struct stat *st) /* Racily smudged entry? */ if (!ce->ce_stat_data.sd_size) { - if (!is_empty_blob_sha1(ce->sha1)) + if (!is_empty_blob_sha1(ce->oid.hash)) changed |= DATA_CHANGED; } @@ -503,7 +503,6 @@ int index_name_pos(const struct index_state *istate, const char *name, int namel return index_name_stage_pos(istate, name, namelen, 0); } -/* Remove entry, return true if there are more entries to go.. */ int remove_index_entry_at(struct index_state *istate, int pos) { struct cache_entry *ce = istate->cache[pos]; @@ -624,7 +623,7 @@ void set_object_name_for_intent_to_add_entry(struct cache_entry *ce) unsigned char sha1[20]; if (write_sha1_file("", 0, blob_type, sha1)) die("cannot create an empty blob in the object database"); - hashcpy(ce->sha1, sha1); + hashcpy(ce->oid.hash, sha1); } int add_to_index(struct index_state *istate, const char *path, struct stat *st, int flags) @@ -690,7 +689,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st, return 0; } if (!intent_only) { - if (index_path(ce->sha1, path, st, HASH_WRITE_OBJECT)) { + if (index_path(ce->oid.hash, path, st, HASH_WRITE_OBJECT)) { free(ce); return error("unable to index file %s", path); } @@ -704,7 +703,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st, /* It was suspected to be racily clean, but it turns out to be Ok */ was_same = (alias && !ce_stage(alias) && - !hashcmp(alias->sha1, ce->sha1) && + !oidcmp(&alias->oid, &ce->oid) && ce->ce_mode == alias->ce_mode); if (pretend) @@ -742,7 +741,7 @@ struct cache_entry *make_cache_entry(unsigned int mode, size = cache_entry_size(len); ce = xcalloc(1, size); - hashcpy(ce->sha1, sha1); + hashcpy(ce->oid.hash, sha1); memcpy(ce->name, path, len); ce->ce_flags = create_ce_flags(stage); ce->ce_namelen = len; @@ -1418,12 +1417,9 @@ static int read_index_extension(struct index_state *istate, return 0; } -int hold_locked_index(struct lock_file *lk, int die_on_error) +int hold_locked_index(struct lock_file *lk, int lock_flags) { - return hold_lock_file_for_update(lk, get_index_file(), - die_on_error - ? LOCK_DIE_ON_ERROR - : 0); + return hold_lock_file_for_update(lk, get_index_file(), lock_flags); } int read_index(struct index_state *istate) @@ -1451,7 +1447,7 @@ static struct cache_entry *cache_entry_from_ondisk(struct ondisk_cache_entry *on ce->ce_flags = flags & ~CE_NAMEMASK; ce->ce_namelen = len; ce->index = 0; - hashcpy(ce->sha1, ondisk->sha1); + hashcpy(ce->oid.hash, ondisk->sha1); memcpy(ce->name, name, len); ce->name[len] = '\0'; return ce; @@ -1562,10 +1558,27 @@ static void tweak_untracked_cache(struct index_state *istate) } } +static void tweak_split_index(struct index_state *istate) +{ + switch (git_config_get_split_index()) { + case -1: /* unset: do nothing */ + break; + case 0: /* false */ + remove_split_index(istate); + break; + case 1: /* true */ + add_split_index(istate); + break; + default: /* unknown value: do nothing */ + break; + } +} + static void post_read_index_from(struct index_state *istate) { check_ce_order(istate); tweak_untracked_cache(istate); + tweak_split_index(istate); } /* remember to discard_cache() before reading a different cache! */ @@ -1661,10 +1674,25 @@ unmap: die("index file corrupt"); } +/* + * Signal that the shared index is used by updating its mtime. + * + * This way, shared index can be removed if they have not been used + * for some time. + */ +static void freshen_shared_index(char *base_sha1_hex, int warn) +{ + const char *shared_index = git_path("sharedindex.%s", base_sha1_hex); + if (!check_and_freshen_file(shared_index, 1) && warn) + warning("could not freshen shared index '%s'", shared_index); +} + int read_index_from(struct index_state *istate, const char *path) { struct split_index *split_index; int ret; + char *base_sha1_hex; + const char *base_path; /* istate->initialized covers both .git/index and .git/sharedindex.xxx */ if (istate->initialized) @@ -1682,15 +1710,16 @@ int read_index_from(struct index_state *istate, const char *path) discard_index(split_index->base); else split_index->base = xcalloc(1, sizeof(*split_index->base)); - ret = do_read_index(split_index->base, - git_path("sharedindex.%s", - sha1_to_hex(split_index->base_sha1)), 1); + + base_sha1_hex = sha1_to_hex(split_index->base_sha1); + base_path = git_path("sharedindex.%s", base_sha1_hex); + ret = do_read_index(split_index->base, base_path, 1); if (hashcmp(split_index->base_sha1, split_index->base->sha1)) die("broken index, expect %s in %s, got %s", - sha1_to_hex(split_index->base_sha1), - git_path("sharedindex.%s", - sha1_to_hex(split_index->base_sha1)), + base_sha1_hex, base_path, sha1_to_hex(split_index->base->sha1)); + + freshen_shared_index(base_sha1_hex, 0); merge_base_index(istate); post_read_index_from(istate); return ret; @@ -1876,7 +1905,7 @@ static char *copy_cache_entry_to_ondisk(struct ondisk_cache_entry *ondisk, ondisk->uid = htonl(ce->ce_stat_data.sd_uid); ondisk->gid = htonl(ce->ce_stat_data.sd_gid); ondisk->size = htonl(ce->ce_stat_data.sd_size); - hashcpy(ondisk->sha1, ce->sha1); + hashcpy(ondisk->sha1, ce->oid.hash); flags = ce->ce_flags & ~CE_NAMEMASK; flags |= (ce_namelen(ce) >= CE_NAMEMASK ? CE_NAMEMASK : ce_namelen(ce)); @@ -2065,7 +2094,7 @@ static int do_write_index(struct index_state *istate, int newfd, continue; if (!ce_uptodate(ce) && is_racy_timestamp(istate, ce)) ce_smudge_racily_clean_entry(ce); - if (is_null_sha1(ce->sha1)) { + if (is_null_oid(&ce->oid)) { static const char msg[] = "cache entry has null sha1: %s"; static int allow = -1; @@ -2173,6 +2202,65 @@ static int write_split_index(struct index_state *istate, return ret; } +static const char *shared_index_expire = "2.weeks.ago"; + +static unsigned long get_shared_index_expire_date(void) +{ + static unsigned long shared_index_expire_date; + static int shared_index_expire_date_prepared; + + if (!shared_index_expire_date_prepared) { + git_config_get_expiry("splitindex.sharedindexexpire", + &shared_index_expire); + shared_index_expire_date = approxidate(shared_index_expire); + shared_index_expire_date_prepared = 1; + } + + return shared_index_expire_date; +} + +static int should_delete_shared_index(const char *shared_index_path) +{ + struct stat st; + unsigned long expiration; + + /* Check timestamp */ + expiration = get_shared_index_expire_date(); + if (!expiration) + return 0; + if (stat(shared_index_path, &st)) + return error_errno(_("could not stat '%s"), shared_index_path); + if (st.st_mtime > expiration) + return 0; + + return 1; +} + +static int clean_shared_index_files(const char *current_hex) +{ + struct dirent *de; + DIR *dir = opendir(get_git_dir()); + + if (!dir) + return error_errno(_("unable to open git dir: %s"), get_git_dir()); + + while ((de = readdir(dir)) != NULL) { + const char *sha1_hex; + const char *shared_index_path; + if (!skip_prefix(de->d_name, "sharedindex.", &sha1_hex)) + continue; + if (!strcmp(sha1_hex, current_hex)) + continue; + shared_index_path = git_path("%s", de->d_name); + if (should_delete_shared_index(shared_index_path) > 0 && + unlink(shared_index_path)) + warning_errno(_("unable to unlink: %s"), shared_index_path); + } + closedir(dir); + + return 0; +} + static struct tempfile temporary_sharedindex; static int write_shared_index(struct index_state *istate, @@ -2194,14 +2282,48 @@ static int write_shared_index(struct index_state *istate, } ret = rename_tempfile(&temporary_sharedindex, git_path("sharedindex.%s", sha1_to_hex(si->base->sha1))); - if (!ret) + if (!ret) { hashcpy(si->base_sha1, si->base->sha1); + clean_shared_index_files(sha1_to_hex(si->base->sha1)); + } + return ret; } +static const int default_max_percent_split_change = 20; + +static int too_many_not_shared_entries(struct index_state *istate) +{ + int i, not_shared = 0; + int max_split = git_config_get_max_percent_split_change(); + + switch (max_split) { + case -1: + /* not or badly configured: use the default value */ + max_split = default_max_percent_split_change; + break; + case 0: + return 1; /* 0% means always write a new shared index */ + case 100: + return 0; /* 100% means never write a new shared index */ + default: + break; /* just use the configured value */ + } + + /* Count not shared entries */ + for (i = 0; i < istate->cache_nr; i++) { + struct cache_entry *ce = istate->cache[i]; + if (!ce->index) + not_shared++; + } + + return (int64_t)istate->cache_nr * max_split < (int64_t)not_shared * 100; +} + int write_locked_index(struct index_state *istate, struct lock_file *lock, unsigned flags) { + int new_shared_index, ret; struct split_index *si = istate->split_index; if (!si || alternate_index_output || @@ -2216,13 +2338,24 @@ int write_locked_index(struct index_state *istate, struct lock_file *lock, if ((v & 15) < 6) istate->cache_changed |= SPLIT_INDEX_ORDERED; } - if (istate->cache_changed & SPLIT_INDEX_ORDERED) { - int ret = write_shared_index(istate, lock, flags); + if (too_many_not_shared_entries(istate)) + istate->cache_changed |= SPLIT_INDEX_ORDERED; + + new_shared_index = istate->cache_changed & SPLIT_INDEX_ORDERED; + + if (new_shared_index) { + ret = write_shared_index(istate, lock, flags); if (ret) return ret; } - return write_split_index(istate, lock, flags); + ret = write_split_index(istate, lock, flags); + + /* Freshen the shared index only if the split-index was written */ + if (!ret && !new_shared_index) + freshen_shared_index(sha1_to_hex(si->base_sha1), 1); + + return ret; } /* @@ -2288,7 +2421,8 @@ int index_name_is_other(const struct index_state *istate, const char *name, return 1; } -void *read_blob_data_from_index(struct index_state *istate, const char *path, unsigned long *size) +void *read_blob_data_from_index(const struct index_state *istate, + const char *path, unsigned long *size) { int pos, len; unsigned long sz; @@ -2312,7 +2446,7 @@ void *read_blob_data_from_index(struct index_state *istate, const char *path, un } if (pos < 0) return NULL; - data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz); + data = read_sha1_file(istate->cache[pos]->oid.hash, &type, &sz); if (!data || type != OBJ_BLOB) { free(data); return NULL; |