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-rw-r--r--packfile.c226
1 files changed, 127 insertions, 99 deletions
diff --git a/packfile.c b/packfile.c
index c0d83fdfed..f4e752996d 100644
--- a/packfile.c
+++ b/packfile.c
@@ -6,7 +6,6 @@
#include "mergesort.h"
#include "packfile.h"
#include "delta.h"
-#include "list.h"
#include "streaming.h"
#include "sha1-lookup.h"
#include "commit.h"
@@ -17,14 +16,15 @@
#include "object-store.h"
#include "midx.h"
#include "commit-graph.h"
+#include "promisor-remote.h"
char *odb_pack_name(struct strbuf *buf,
- const unsigned char *sha1,
+ const unsigned char *hash,
const char *ext)
{
strbuf_reset(buf);
strbuf_addf(buf, "%s/pack/pack-%s.%s", get_object_directory(),
- sha1_to_hex(sha1), ext);
+ hash_to_hex(hash), ext);
return buf->buf;
}
@@ -287,13 +287,6 @@ static int unuse_one_window(struct packed_git *current)
return 0;
}
-void release_pack_memory(size_t need)
-{
- size_t cur = pack_mapped;
- while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
- ; /* nothing */
-}
-
void close_pack_windows(struct packed_git *p)
{
while (p->windows) {
@@ -355,6 +348,34 @@ void close_object_store(struct raw_object_store *o)
close_commit_graph(o);
}
+void unlink_pack_path(const char *pack_name, int force_delete)
+{
+ static const char *exts[] = {".pack", ".idx", ".keep", ".bitmap", ".promisor"};
+ int i;
+ struct strbuf buf = STRBUF_INIT;
+ size_t plen;
+
+ strbuf_addstr(&buf, pack_name);
+ strip_suffix_mem(buf.buf, &buf.len, ".pack");
+ plen = buf.len;
+
+ if (!force_delete) {
+ strbuf_addstr(&buf, ".keep");
+ if (!access(buf.buf, F_OK)) {
+ strbuf_release(&buf);
+ return;
+ }
+ }
+
+ for (i = 0; i < ARRAY_SIZE(exts); i++) {
+ strbuf_setlen(&buf, plen);
+ strbuf_addstr(&buf, exts[i]);
+ unlink(buf.buf);
+ }
+
+ strbuf_release(&buf);
+}
+
/*
* The LRU pack is the one with the oldest MRU window, preferring packs
* with no used windows, or the oldest mtime if it has no windows allocated.
@@ -489,7 +510,6 @@ static int open_packed_git_1(struct packed_git *p)
struct pack_header hdr;
unsigned char hash[GIT_MAX_RAWSZ];
unsigned char *idx_hash;
- long fd_flag;
ssize_t read_result;
const unsigned hashsz = the_hash_algo->rawsz;
@@ -533,16 +553,6 @@ static int open_packed_git_1(struct packed_git *p)
} else if (p->pack_size != st.st_size)
return error("packfile %s size changed", p->pack_name);
- /* We leave these file descriptors open with sliding mmap;
- * there is no point keeping them open across exec(), though.
- */
- fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
- if (fd_flag < 0)
- return error("cannot determine file descriptor flags");
- fd_flag |= FD_CLOEXEC;
- if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
- return error("cannot set FD_CLOEXEC");
-
/* Verify we recognize this pack file format. */
read_result = read_in_full(p->pack_fd, &hdr, sizeof(hdr));
if (read_result < 0)
@@ -566,9 +576,8 @@ static int open_packed_git_1(struct packed_git *p)
" while index indicates %"PRIu32" objects",
p->pack_name, ntohl(hdr.hdr_entries),
p->num_objects);
- if (lseek(p->pack_fd, p->pack_size - hashsz, SEEK_SET) == -1)
- return error("end of packfile %s is unavailable", p->pack_name);
- read_result = read_in_full(p->pack_fd, hash, hashsz);
+ read_result = pread_in_full(p->pack_fd, hash, hashsz,
+ p->pack_size - hashsz);
if (read_result < 0)
return error_errno("error reading from %s", p->pack_name);
if (read_result != hashsz)
@@ -682,23 +691,12 @@ void unuse_pack(struct pack_window **w_cursor)
}
}
-static void try_to_free_pack_memory(size_t size)
-{
- release_pack_memory(size);
-}
-
struct packed_git *add_packed_git(const char *path, size_t path_len, int local)
{
- static int have_set_try_to_free_routine;
struct stat st;
size_t alloc;
struct packed_git *p;
- if (!have_set_try_to_free_routine) {
- have_set_try_to_free_routine = 1;
- set_try_to_free_routine(try_to_free_pack_memory);
- }
-
/*
* Make sure a corresponding .pack file exists and that
* the index looks sane.
@@ -747,6 +745,9 @@ void install_packed_git(struct repository *r, struct packed_git *pack)
pack->next = r->objects->packed_git;
r->objects->packed_git = pack;
+
+ hashmap_entry_init(&pack->packmap_ent, strhash(pack->pack_name));
+ hashmap_add(&r->objects->pack_map, &pack->packmap_ent);
}
void (*report_garbage)(unsigned seen_bits, const char *path);
@@ -846,20 +847,18 @@ static void prepare_pack(const char *full_name, size_t full_name_len,
if (strip_suffix_mem(full_name, &base_len, ".idx") &&
!(data->m && midx_contains_pack(data->m, file_name))) {
- /* Don't reopen a pack we already have. */
- for (p = data->r->objects->packed_git; p; p = p->next) {
- size_t len;
- if (strip_suffix(p->pack_name, ".pack", &len) &&
- len == base_len &&
- !memcmp(p->pack_name, full_name, len))
- break;
- }
+ struct hashmap_entry hent;
+ char *pack_name = xstrfmt("%.*s.pack", (int)base_len, full_name);
+ unsigned int hash = strhash(pack_name);
+ hashmap_entry_init(&hent, hash);
- if (!p) {
+ /* Don't reopen a pack we already have. */
+ if (!hashmap_get(&data->r->objects->pack_map, &hent, pack_name)) {
p = add_packed_git(full_name, full_name_len, data->local);
if (p)
install_packed_git(data->r, p);
}
+ free(pack_name);
}
if (!report_garbage)
@@ -1005,12 +1004,14 @@ void reprepare_packed_git(struct repository *r)
{
struct object_directory *odb;
+ obj_read_lock();
for (odb = r->objects->odb; odb; odb = odb->next)
odb_clear_loose_cache(odb);
r->objects->approximate_object_count_valid = 0;
r->objects->packed_git_initialized = 0;
prepare_packed_git(r);
+ obj_read_unlock();
}
struct packed_git *get_packed_git(struct repository *r)
@@ -1087,7 +1088,23 @@ unsigned long get_size_from_delta(struct packed_git *p,
do {
in = use_pack(p, w_curs, curpos, &stream.avail_in);
stream.next_in = in;
+ /*
+ * Note: the window section returned by use_pack() must be
+ * available throughout git_inflate()'s unlocked execution. To
+ * ensure no other thread will modify the window in the
+ * meantime, we rely on the packed_window.inuse_cnt. This
+ * counter is incremented before window reading and checked
+ * before window disposal.
+ *
+ * Other worrying sections could be the call to close_pack_fd(),
+ * which can close packs even with in-use windows, and to
+ * reprepare_packed_git(). Regarding the former, mmap doc says:
+ * "closing the file descriptor does not unmap the region". And
+ * for the latter, it won't re-open already available packs.
+ */
+ obj_read_unlock();
st = git_inflate(&stream, Z_FINISH);
+ obj_read_lock();
curpos += stream.next_in - in;
} while ((st == Z_OK || st == Z_BUF_ERROR) &&
stream.total_out < sizeof(delta_head));
@@ -1163,11 +1180,11 @@ const struct packed_git *has_packed_and_bad(struct repository *r,
return NULL;
}
-static off_t get_delta_base(struct packed_git *p,
- struct pack_window **w_curs,
- off_t *curpos,
- enum object_type type,
- off_t delta_obj_offset)
+off_t get_delta_base(struct packed_git *p,
+ struct pack_window **w_curs,
+ off_t *curpos,
+ enum object_type type,
+ off_t delta_obj_offset)
{
unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL);
off_t base_offset;
@@ -1208,30 +1225,32 @@ static off_t get_delta_base(struct packed_git *p,
* the final object lookup), but more expensive for OFS deltas (we
* have to load the revidx to convert the offset back into a sha1).
*/
-static const unsigned char *get_delta_base_sha1(struct packed_git *p,
- struct pack_window **w_curs,
- off_t curpos,
- enum object_type type,
- off_t delta_obj_offset)
+static int get_delta_base_oid(struct packed_git *p,
+ struct pack_window **w_curs,
+ off_t curpos,
+ struct object_id *oid,
+ enum object_type type,
+ off_t delta_obj_offset)
{
if (type == OBJ_REF_DELTA) {
unsigned char *base = use_pack(p, w_curs, curpos, NULL);
- return base;
+ oidread(oid, base);
+ return 0;
} else if (type == OBJ_OFS_DELTA) {
struct revindex_entry *revidx;
off_t base_offset = get_delta_base(p, w_curs, &curpos,
type, delta_obj_offset);
if (!base_offset)
- return NULL;
+ return -1;
revidx = find_pack_revindex(p, base_offset);
if (!revidx)
- return NULL;
+ return -1;
- return nth_packed_object_sha1(p, revidx->nr);
+ return nth_packed_object_id(oid, p, revidx->nr);
} else
- return NULL;
+ return -1;
}
static int retry_bad_packed_offset(struct repository *r,
@@ -1244,7 +1263,7 @@ static int retry_bad_packed_offset(struct repository *r,
revidx = find_pack_revindex(p, obj_offset);
if (!revidx)
return OBJ_BAD;
- nth_packed_object_oid(&oid, p, revidx->nr);
+ nth_packed_object_id(&oid, p, revidx->nr);
mark_bad_packed_object(p, oid.hash);
type = oid_object_info(r, &oid, NULL);
if (type <= OBJ_NONE)
@@ -1333,7 +1352,7 @@ struct delta_base_cache_key {
};
struct delta_base_cache_entry {
- struct hashmap hash;
+ struct hashmap_entry ent;
struct delta_base_cache_key key;
struct list_head lru;
void *data;
@@ -1353,7 +1372,7 @@ static unsigned int pack_entry_hash(struct packed_git *p, off_t base_offset)
static struct delta_base_cache_entry *
get_delta_base_cache_entry(struct packed_git *p, off_t base_offset)
{
- struct hashmap_entry entry;
+ struct hashmap_entry entry, *e;
struct delta_base_cache_key key;
if (!delta_base_cache.cmpfn)
@@ -1362,7 +1381,8 @@ get_delta_base_cache_entry(struct packed_git *p, off_t base_offset)
hashmap_entry_init(&entry, pack_entry_hash(p, base_offset));
key.p = p;
key.base_offset = base_offset;
- return hashmap_get(&delta_base_cache, &entry, &key);
+ e = hashmap_get(&delta_base_cache, &entry, &key);
+ return e ? container_of(e, struct delta_base_cache_entry, ent) : NULL;
}
static int delta_base_cache_key_eq(const struct delta_base_cache_key *a,
@@ -1372,11 +1392,16 @@ static int delta_base_cache_key_eq(const struct delta_base_cache_key *a,
}
static int delta_base_cache_hash_cmp(const void *unused_cmp_data,
- const void *va, const void *vb,
+ const struct hashmap_entry *va,
+ const struct hashmap_entry *vb,
const void *vkey)
{
- const struct delta_base_cache_entry *a = va, *b = vb;
+ const struct delta_base_cache_entry *a, *b;
const struct delta_base_cache_key *key = vkey;
+
+ a = container_of(va, const struct delta_base_cache_entry, ent);
+ b = container_of(vb, const struct delta_base_cache_entry, ent);
+
if (key)
return !delta_base_cache_key_eq(&a->key, key);
else
@@ -1395,7 +1420,7 @@ static int in_delta_base_cache(struct packed_git *p, off_t base_offset)
*/
static void detach_delta_base_cache_entry(struct delta_base_cache_entry *ent)
{
- hashmap_remove(&delta_base_cache, ent, &ent->key);
+ hashmap_remove(&delta_base_cache, &ent->ent, &ent->key);
list_del(&ent->lru);
delta_base_cached -= ent->size;
free(ent);
@@ -1440,6 +1465,14 @@ static void add_delta_base_cache(struct packed_git *p, off_t base_offset,
struct delta_base_cache_entry *ent = xmalloc(sizeof(*ent));
struct list_head *lru, *tmp;
+ /*
+ * Check required to avoid redundant entries when more than one thread
+ * is unpacking the same object, in unpack_entry() (since its phases I
+ * and III might run concurrently across multiple threads).
+ */
+ if (in_delta_base_cache(p, base_offset))
+ return;
+
delta_base_cached += base_size;
list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
@@ -1459,8 +1492,8 @@ static void add_delta_base_cache(struct packed_git *p, off_t base_offset,
if (!delta_base_cache.cmpfn)
hashmap_init(&delta_base_cache, delta_base_cache_hash_cmp, NULL, 0);
- hashmap_entry_init(ent, pack_entry_hash(p, base_offset));
- hashmap_add(&delta_base_cache, ent);
+ hashmap_entry_init(&ent->ent, pack_entry_hash(p, base_offset));
+ hashmap_add(&delta_base_cache, &ent->ent);
}
int packed_object_info(struct repository *r, struct packed_git *p,
@@ -1525,20 +1558,16 @@ int packed_object_info(struct repository *r, struct packed_git *p,
}
}
- if (oi->delta_base_sha1) {
+ if (oi->delta_base_oid) {
if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
- const unsigned char *base;
-
- base = get_delta_base_sha1(p, &w_curs, curpos,
- type, obj_offset);
- if (!base) {
+ if (get_delta_base_oid(p, &w_curs, curpos,
+ oi->delta_base_oid,
+ type, obj_offset) < 0) {
type = OBJ_BAD;
goto out;
}
-
- hashcpy(oi->delta_base_sha1, base);
} else
- hashclr(oi->delta_base_sha1);
+ oidclr(oi->delta_base_oid);
}
oi->whence = in_delta_base_cache(p, obj_offset) ? OI_DBCACHED :
@@ -1569,7 +1598,15 @@ static void *unpack_compressed_entry(struct packed_git *p,
do {
in = use_pack(p, w_curs, curpos, &stream.avail_in);
stream.next_in = in;
+ /*
+ * Note: we must ensure the window section returned by
+ * use_pack() will be available throughout git_inflate()'s
+ * unlocked execution. Please refer to the comment at
+ * get_size_from_delta() to see how this is done.
+ */
+ obj_read_unlock();
st = git_inflate(&stream, Z_FINISH);
+ obj_read_lock();
if (!stream.avail_out)
break; /* the payload is larger than it should be */
curpos += stream.next_in - in;
@@ -1654,7 +1691,7 @@ void *unpack_entry(struct repository *r, struct packed_git *p, off_t obj_offset,
off_t len = revidx[1].offset - obj_offset;
if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) {
struct object_id oid;
- nth_packed_object_oid(&oid, p, revidx->nr);
+ nth_packed_object_id(&oid, p, revidx->nr);
error("bad packed object CRC for %s",
oid_to_hex(&oid));
mark_bad_packed_object(p, oid.hash);
@@ -1743,7 +1780,7 @@ void *unpack_entry(struct repository *r, struct packed_git *p, off_t obj_offset,
struct object_id base_oid;
revidx = find_pack_revindex(p, obj_offset);
if (revidx) {
- nth_packed_object_oid(&base_oid, p, revidx->nr);
+ nth_packed_object_id(&base_oid, p, revidx->nr);
error("failed to read delta base object %s"
" at offset %"PRIuMAX" from %s",
oid_to_hex(&base_oid), (uintmax_t)obj_offset,
@@ -1830,36 +1867,27 @@ int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32
index_lookup, index_lookup_width, result);
}
-const unsigned char *nth_packed_object_sha1(struct packed_git *p,
- uint32_t n)
+int nth_packed_object_id(struct object_id *oid,
+ struct packed_git *p,
+ uint32_t n)
{
const unsigned char *index = p->index_data;
const unsigned int hashsz = the_hash_algo->rawsz;
if (!index) {
if (open_pack_index(p))
- return NULL;
+ return -1;
index = p->index_data;
}
if (n >= p->num_objects)
- return NULL;
+ return -1;
index += 4 * 256;
if (p->index_version == 1) {
- return index + (hashsz + 4) * n + 4;
+ oidread(oid, index + (hashsz + 4) * n + 4);
} else {
index += 8;
- return index + hashsz * n;
+ oidread(oid, index + hashsz * n);
}
-}
-
-const struct object_id *nth_packed_object_oid(struct object_id *oid,
- struct packed_git *p,
- uint32_t n)
-{
- const unsigned char *hash = nth_packed_object_sha1(p, n);
- if (!hash)
- return NULL;
- hashcpy(oid->hash, hash);
- return oid;
+ return 0;
}
void check_pack_index_ptr(const struct packed_git *p, const void *vptr)
@@ -2038,7 +2066,7 @@ int for_each_object_in_pack(struct packed_git *p,
else
pos = i;
- if (!nth_packed_object_oid(&oid, p, pos))
+ if (nth_packed_object_id(&oid, p, pos) < 0)
return error("unable to get sha1 of object %u in %s",
pos, p->pack_name);
@@ -2111,7 +2139,7 @@ static int add_promisor_object(const struct object_id *oid,
oidset_insert(set, &parents->item->object.oid);
} else if (obj->type == OBJ_TAG) {
struct tag *tag = (struct tag *) obj;
- oidset_insert(set, &tag->tagged->oid);
+ oidset_insert(set, get_tagged_oid(tag));
}
return 0;
}
@@ -2122,7 +2150,7 @@ int is_promisor_object(const struct object_id *oid)
static int promisor_objects_prepared;
if (!promisor_objects_prepared) {
- if (repository_format_partial_clone) {
+ if (has_promisor_remote()) {
for_each_packed_object(add_promisor_object,
&promisor_objects,
FOR_EACH_OBJECT_PROMISOR_ONLY);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 10:25:12 +0000