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-rw-r--r--midx.c117
1 files changed, 109 insertions, 8 deletions
diff --git a/midx.c b/midx.c
index 8a505fd..d5d2e95 100644
--- a/midx.c
+++ b/midx.c
@@ -8,6 +8,7 @@
#include "sha1-lookup.h"
#include "midx.h"
#include "progress.h"
+#include "trace2.h"
#define MIDX_SIGNATURE 0x4d494458 /* "MIDX" */
#define MIDX_VERSION 1
@@ -70,7 +71,7 @@ struct multi_pack_index *load_multi_pack_index(const char *object_dir, int local
midx_map = xmmap(NULL, midx_size, PROT_READ, MAP_PRIVATE, fd, 0);
- FLEX_ALLOC_MEM(m, object_dir, object_dir, strlen(object_dir));
+ FLEX_ALLOC_STR(m, object_dir, object_dir);
m->fd = fd;
m->data = midx_map;
m->data_len = midx_size;
@@ -164,6 +165,9 @@ struct multi_pack_index *load_multi_pack_index(const char *object_dir, int local
m->pack_names[i]);
}
+ trace2_data_intmax("midx", the_repository, "load/num_packs", m->num_packs);
+ trace2_data_intmax("midx", the_repository, "load/num_objects", m->num_objects);
+
return m;
cleanup_fail:
@@ -307,7 +311,39 @@ int fill_midx_entry(const struct object_id *oid, struct pack_entry *e, struct mu
return nth_midxed_pack_entry(m, e, pos);
}
-int midx_contains_pack(struct multi_pack_index *m, const char *idx_name)
+/* Match "foo.idx" against either "foo.pack" _or_ "foo.idx". */
+static int cmp_idx_or_pack_name(const char *idx_or_pack_name,
+ const char *idx_name)
+{
+ /* Skip past any initial matching prefix. */
+ while (*idx_name && *idx_name == *idx_or_pack_name) {
+ idx_name++;
+ idx_or_pack_name++;
+ }
+
+ /*
+ * If we didn't match completely, we may have matched "pack-1234." and
+ * be left with "idx" and "pack" respectively, which is also OK. We do
+ * not have to check for "idx" and "idx", because that would have been
+ * a complete match (and in that case these strcmps will be false, but
+ * we'll correctly return 0 from the final strcmp() below.
+ *
+ * Technically this matches "fooidx" and "foopack", but we'd never have
+ * such names in the first place.
+ */
+ if (!strcmp(idx_name, "idx") && !strcmp(idx_or_pack_name, "pack"))
+ return 0;
+
+ /*
+ * This not only checks for a complete match, but also orders based on
+ * the first non-identical character, which means our ordering will
+ * match a raw strcmp(). That makes it OK to use this to binary search
+ * a naively-sorted list.
+ */
+ return strcmp(idx_or_pack_name, idx_name);
+}
+
+int midx_contains_pack(struct multi_pack_index *m, const char *idx_or_pack_name)
{
uint32_t first = 0, last = m->num_packs;
@@ -317,7 +353,7 @@ int midx_contains_pack(struct multi_pack_index *m, const char *idx_name)
int cmp;
current = m->pack_names[mid];
- cmp = strcmp(idx_name, current);
+ cmp = cmp_idx_or_pack_name(idx_or_pack_name, current);
if (!cmp)
return 1;
if (cmp > 0) {
@@ -958,8 +994,35 @@ static void midx_report(const char *fmt, ...)
va_end(ap);
}
+struct pair_pos_vs_id
+{
+ uint32_t pos;
+ uint32_t pack_int_id;
+};
+
+static int compare_pair_pos_vs_id(const void *_a, const void *_b)
+{
+ struct pair_pos_vs_id *a = (struct pair_pos_vs_id *)_a;
+ struct pair_pos_vs_id *b = (struct pair_pos_vs_id *)_b;
+
+ return b->pack_int_id - a->pack_int_id;
+}
+
+/*
+ * Limit calls to display_progress() for performance reasons.
+ * The interval here was arbitrarily chosen.
+ */
+#define SPARSE_PROGRESS_INTERVAL (1 << 12)
+#define midx_display_sparse_progress(progress, n) \
+ do { \
+ uint64_t _n = (n); \
+ if ((_n & (SPARSE_PROGRESS_INTERVAL - 1)) == 0) \
+ display_progress(progress, _n); \
+ } while (0)
+
int verify_midx_file(const char *object_dir)
{
+ struct pair_pos_vs_id *pairs = NULL;
uint32_t i;
struct progress *progress;
struct multi_pack_index *m = load_multi_pack_index(object_dir, 1);
@@ -968,10 +1031,15 @@ int verify_midx_file(const char *object_dir)
if (!m)
return 0;
+ progress = start_progress(_("Looking for referenced packfiles"),
+ m->num_packs);
for (i = 0; i < m->num_packs; i++) {
if (prepare_midx_pack(m, i))
midx_report("failed to load pack in position %d", i);
+
+ display_progress(progress, i + 1);
}
+ stop_progress(&progress);
for (i = 0; i < 255; i++) {
uint32_t oid_fanout1 = ntohl(m->chunk_oid_fanout[i]);
@@ -982,6 +1050,8 @@ int verify_midx_file(const char *object_dir)
i, oid_fanout1, oid_fanout2, i + 1);
}
+ progress = start_sparse_progress(_("Verifying OID order in MIDX"),
+ m->num_objects - 1);
for (i = 0; i < m->num_objects - 1; i++) {
struct object_id oid1, oid2;
@@ -991,18 +1061,47 @@ int verify_midx_file(const char *object_dir)
if (oidcmp(&oid1, &oid2) >= 0)
midx_report(_("oid lookup out of order: oid[%d] = %s >= %s = oid[%d]"),
i, oid_to_hex(&oid1), oid_to_hex(&oid2), i + 1);
+
+ midx_display_sparse_progress(progress, i + 1);
}
+ stop_progress(&progress);
- progress = start_progress(_("Verifying object offsets"), m->num_objects);
+ /*
+ * Create an array mapping each object to its packfile id. Sort it
+ * to group the objects by packfile. Use this permutation to visit
+ * each of the objects and only require 1 packfile to be open at a
+ * time.
+ */
+ ALLOC_ARRAY(pairs, m->num_objects);
+ for (i = 0; i < m->num_objects; i++) {
+ pairs[i].pos = i;
+ pairs[i].pack_int_id = nth_midxed_pack_int_id(m, i);
+ }
+
+ progress = start_sparse_progress(_("Sorting objects by packfile"),
+ m->num_objects);
+ display_progress(progress, 0); /* TODO: Measure QSORT() progress */
+ QSORT(pairs, m->num_objects, compare_pair_pos_vs_id);
+ stop_progress(&progress);
+
+ progress = start_sparse_progress(_("Verifying object offsets"), m->num_objects);
for (i = 0; i < m->num_objects; i++) {
struct object_id oid;
struct pack_entry e;
off_t m_offset, p_offset;
- nth_midxed_object_oid(&oid, m, i);
+ if (i > 0 && pairs[i-1].pack_int_id != pairs[i].pack_int_id &&
+ m->packs[pairs[i-1].pack_int_id])
+ {
+ close_pack_fd(m->packs[pairs[i-1].pack_int_id]);
+ close_pack_index(m->packs[pairs[i-1].pack_int_id]);
+ }
+
+ nth_midxed_object_oid(&oid, m, pairs[i].pos);
+
if (!fill_midx_entry(&oid, &e, m)) {
midx_report(_("failed to load pack entry for oid[%d] = %s"),
- i, oid_to_hex(&oid));
+ pairs[i].pos, oid_to_hex(&oid));
continue;
}
@@ -1017,11 +1116,13 @@ int verify_midx_file(const char *object_dir)
if (m_offset != p_offset)
midx_report(_("incorrect object offset for oid[%d] = %s: %"PRIx64" != %"PRIx64),
- i, oid_to_hex(&oid), m_offset, p_offset);
+ pairs[i].pos, oid_to_hex(&oid), m_offset, p_offset);
- display_progress(progress, i + 1);
+ midx_display_sparse_progress(progress, i + 1);
}
stop_progress(&progress);
+ free(pairs);
+
return verify_midx_error;
}