#define CACHE_EXT(s) ( (s[0]<<24)|(s[1]<<16)|(s[2]<<8)|(s[3]) )
#define CACHE_EXT_TREE 0x54524545 /* "TREE" */
-struct cache_entry **active_cache = NULL;
+struct cache_entry **active_cache;
static time_t index_file_timestamp;
-unsigned int active_nr = 0, active_alloc = 0, active_cache_changed = 0;
+unsigned int active_nr, active_alloc, active_cache_changed;
-struct cache_tree *active_cache_tree = NULL;
+struct cache_tree *active_cache_tree;
-int cache_errno = 0;
+int cache_errno;
-static void *cache_mmap = NULL;
-static size_t cache_mmap_size = 0;
+static void *cache_mmap;
+static size_t cache_mmap_size;
/*
* This only updates the "non-critical" parts of the directory
if (fd >= 0) {
unsigned char sha1[20];
if (!index_fd(sha1, fd, st, 0, NULL))
- match = memcmp(sha1, ce->sha1, 20);
+ match = hashcmp(sha1, ce->sha1);
/* index_fd() closed the file descriptor already */
}
return match;
return changed;
}
-int ce_match_stat(struct cache_entry *ce, struct stat *st, int ignore_valid)
+int ce_match_stat(struct cache_entry *ce, struct stat *st, int options)
{
unsigned int changed;
+ int ignore_valid = options & 01;
+ int assume_racy_is_modified = options & 02;
/*
* If it's marked as always valid in the index, it's
*/
if (!changed &&
index_file_timestamp &&
- index_file_timestamp <= ntohl(ce->ce_mtime.sec))
- changed |= ce_modified_check_fs(ce, st);
+ index_file_timestamp <= ntohl(ce->ce_mtime.sec)) {
+ if (assume_racy_is_modified)
+ changed |= DATA_CHANGED;
+ else
+ changed |= ce_modified_check_fs(ce, st);
+ }
return changed;
}
ce->ce_mode = create_ce_mode(st.st_mode);
if (!trust_executable_bit) {
/* If there is an existing entry, pick the mode bits
- * from it.
+ * from it, otherwise force to 644.
*/
int pos = cache_name_pos(path, namelen);
if (pos >= 0)
ce->ce_mode = active_cache[pos]->ce_mode;
+ else
+ ce->ce_mode = create_ce_mode(S_IFREG | 0644);
}
if (index_path(ce->sha1, path, &st, 1))
SHA1_Init(&c);
SHA1_Update(&c, hdr, size - 20);
SHA1_Final(sha1, &c);
- if (memcmp(sha1, (char *) hdr + size - 20, 20))
+ if (hashcmp(sha1, (unsigned char *)hdr + size - 20))
return error("bad index file sha1 signature");
return 0;
}
die("index file corrupt");
}
+int discard_cache()
+{
+ int ret;
+
+ active_nr = active_cache_changed = 0;
+ index_file_timestamp = 0;
+ cache_tree_free(&active_cache_tree);
+ if (cache_mmap == NULL)
+ return 0;
+ ret = munmap(cache_mmap, cache_mmap_size);
+ cache_mmap = NULL;
+ cache_mmap_size = 0;
+
+ /* no need to throw away allocated active_cache */
+ return ret;
+}
+
#define WRITE_BUFFER_SIZE 8192
static unsigned char write_buffer[WRITE_BUFFER_SIZE];
static unsigned long write_buffer_len;
{
SHA_CTX c;
struct cache_header hdr;
- int i, removed, recent;
- struct stat st;
- time_t now;
+ int i, removed;
for (i = removed = 0; i < entries; i++)
if (!cache[i]->ce_mode)
return -1;
}
}
-
- /*
- * To prevent later ce_match_stat() from always falling into
- * check_fs(), if we have too many entries that can trigger
- * racily clean check, we are better off delaying the return.
- * We arbitrarily say if more than 20 paths or 25% of total
- * paths are very new, we delay the return until the index
- * file gets a new timestamp.
- *
- * NOTE! NOTE! NOTE!
- *
- * This assumes that nobody is touching the working tree while
- * we are updating the index.
- */
-
- /* Make sure that the new index file has st_mtime
- * that is current enough -- ce_write() batches the data
- * so it might not have written anything yet.
- */
- ce_write_flush(&c, newfd);
-
- now = fstat(newfd, &st) ? 0 : st.st_mtime;
- if (now) {
- recent = 0;
- for (i = 0; i < entries; i++) {
- struct cache_entry *ce = cache[i];
- time_t entry_time = (time_t) ntohl(ce->ce_mtime.sec);
- if (!ce->ce_mode)
- continue;
- if (now && now <= entry_time)
- recent++;
- }
- if (20 < recent && entries <= recent * 4) {
-#if 0
- fprintf(stderr, "entries %d\n", entries);
- fprintf(stderr, "recent %d\n", recent);
- fprintf(stderr, "now %lu\n", now);
-#endif
- while (!fstat(newfd, &st) && st.st_mtime <= now) {
- off_t where = lseek(newfd, 0, SEEK_CUR);
- sleep(1);
- if ((where == (off_t) -1) ||
- (write(newfd, "", 1) != 1) ||
- (lseek(newfd, -1, SEEK_CUR) != where) ||
- ftruncate(newfd, where))
- break;
- }
- }
- }
return ce_flush(&c, newfd);
}