Fsck tries to access loose objects in order of inode number,
with the hope that this would make cold cache access faster
on a spinning disk. This dates back to 7e8c174 (fsck-cache:
sort entries by inode number, 2005-05-02), which predates
the invention of packfiles.
These days, there's not much point in trying to optimize
cold cache for a large number of loose objects. You are much
better off to simply pack the objects, which will reduce the
disk footprint _and_ provide better locality of data access.
So while you can certainly construct pathological cases
where this code might help, it is not worth the trouble
anymore.
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
builtin/fsck.c | 70 ++--------------------------------------------------------
1 file changed, 2 insertions(+), 68 deletions(-)
diff --git a/builtin/fsck.c b/builtin/fsck.c
index a019f4a..73c3596 100644
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -39,14 +39,6 @@ static int show_dangling = 1;
#define ERROR_REACHABLE 02
#define ERROR_PACK 04
-#ifdef NO_D_INO_IN_DIRENT
-#define SORT_DIRENT 0
-#define DIRENT_SORT_HINT(de) 0
-#else
-#define SORT_DIRENT 1
-#define DIRENT_SORT_HINT(de) ((de)->d_ino)
-#endif
-
static int fsck_config(const char *var, const char *value, void *cb)
{
if (strcmp(var, "fsck.skiplist") == 0) {
@@ -373,64 +365,6 @@ static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type,
return fsck_obj(obj);
}
-/*
- * This is the sorting chunk size: make it reasonably
- * big so that we can sort well..
- */
-#define MAX_SHA1_ENTRIES (1024)
-
-struct sha1_entry {
- unsigned long ino;
- unsigned char sha1[20];
-};
-
-static struct {
- unsigned long nr;
- struct sha1_entry *entry[MAX_SHA1_ENTRIES];
-} sha1_list;
-
-static int ino_compare(const void *_a, const void *_b)
-{
- const struct sha1_entry *a = _a, *b = _b;
- unsigned long ino1 = a->ino, ino2 = b->ino;
- return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
-}
-
-static void fsck_sha1_list(void)
-{
- int i, nr = sha1_list.nr;
-
- if (SORT_DIRENT)
- qsort(sha1_list.entry, nr,
- sizeof(struct sha1_entry *), ino_compare);
- for (i = 0; i < nr; i++) {
- struct sha1_entry *entry = sha1_list.entry[i];
- unsigned char *sha1 = entry->sha1;
-
- sha1_list.entry[i] = NULL;
- if (fsck_sha1(sha1))
- errors_found |= ERROR_OBJECT;
- free(entry);
- }
- sha1_list.nr = 0;
-}
-
-static void add_sha1_list(unsigned char *sha1, unsigned long ino)
-{
- struct sha1_entry *entry = xmalloc(sizeof(*entry));
- int nr;
-
- entry->ino = ino;
- hashcpy(entry->sha1, sha1);
- nr = sha1_list.nr;
- if (nr == MAX_SHA1_ENTRIES) {
- fsck_sha1_list();
- nr = 0;
- }
- sha1_list.entry[nr] = entry;
- sha1_list.nr = ++nr;
-}
-
static inline int is_loose_object_file(struct dirent *de,
char *name, unsigned char *sha1)
{
@@ -459,7 +393,8 @@ static void fsck_dir(int i, char *path)
if (is_dot_or_dotdot(de->d_name))
continue;
if (is_loose_object_file(de, name, sha1)) {
- add_sha1_list(sha1, DIRENT_SORT_HINT(de));
+ if (fsck_sha1(sha1))
+ errors_found |= ERROR_OBJECT;
continue;
}
if (starts_with(de->d_name, "tmp_obj_"))
@@ -573,7 +508,6 @@ static void fsck_object_dir(const char *path)
display_progress(progress, i+1);
}
stop_progress(&progress);
- fsck_sha1_list();
}
static int fsck_head_link(void)
--
2.6.0.rc3.454.g204ad51
--
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