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s3:g_lock: remember an unique_lock_epoch similar to unique_data_epoch

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It changes with every lock and unlock.

This will be needed in future in order to differentiate between
lock and data changed.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15125

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This commit is contained in:
Stefan Metzmacher 2022-06-26 16:16:38 +00:00 committed by Ralph Boehme
parent 2e92267920
commit 20f3fd0219
1 changed files with 17 additions and 2 deletions
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19
source3/lib/g_lock.c
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@ -43,6 +43,7 @@ struct g_lock {
struct server_id exclusive;
size_t num_shared;
uint8_t *shared;
uint64_t unique_lock_epoch;
uint64_t unique_data_epoch;
size_t datalen;
uint8_t *data;
@ -52,6 +53,7 @@ static bool g_lock_parse(uint8_t *buf, size_t buflen, struct g_lock *lck)
{
struct server_id exclusive;
size_t num_shared, shared_len;
uint64_t unique_lock_epoch;
uint64_t unique_data_epoch;
if (buflen < (SERVER_ID_BUF_LENGTH + /* exclusive */
@ -59,6 +61,7 @@ static bool g_lock_parse(uint8_t *buf, size_t buflen, struct g_lock *lck)
sizeof(uint32_t))) { /* num_shared */
struct g_lock ret = {
.exclusive.pid = 0,
.unique_lock_epoch = generate_unique_u64(0),
.unique_data_epoch = generate_unique_u64(0),
};
*lck = ret;
@ -69,6 +72,10 @@ static bool g_lock_parse(uint8_t *buf, size_t buflen, struct g_lock *lck)
buf += SERVER_ID_BUF_LENGTH;
buflen -= SERVER_ID_BUF_LENGTH;
unique_lock_epoch = BVAL(buf, 0);
buf += sizeof(uint64_t);
buflen -= sizeof(uint64_t);
unique_data_epoch = BVAL(buf, 0);
buf += sizeof(uint64_t);
buflen -= sizeof(uint64_t);
@ -90,6 +97,7 @@ static bool g_lock_parse(uint8_t *buf, size_t buflen, struct g_lock *lck)
.exclusive = exclusive,
.num_shared = num_shared,
.shared = buf,
.unique_lock_epoch = unique_lock_epoch,
.unique_data_epoch = unique_data_epoch,
.datalen = buflen-shared_len,
.data = buf+shared_len,
@ -129,7 +137,7 @@ static NTSTATUS g_lock_store(
size_t num_new_dbufs)
{
uint8_t exclusive[SERVER_ID_BUF_LENGTH];
uint8_t seqnum_buf[sizeof(uint64_t)];
uint8_t seqnum_buf[sizeof(uint64_t)*2];
uint8_t sizebuf[sizeof(uint32_t)];
uint8_t new_shared_buf[SERVER_ID_BUF_LENGTH];
@ -160,7 +168,8 @@ static NTSTATUS g_lock_store(
}
server_id_put(exclusive, lck->exclusive);
SBVAL(seqnum_buf, 0, lck->unique_data_epoch);
SBVAL(seqnum_buf, 0, lck->unique_lock_epoch);
SBVAL(seqnum_buf, 8, lck->unique_data_epoch);
if (new_shared != NULL) {
if (lck->num_shared >= UINT32_MAX) {
@ -370,6 +379,8 @@ static NTSTATUS g_lock_trylock(
g_lock_cleanup_dead(&lck, state->dead_blocker);
lck.unique_lock_epoch = generate_unique_u64(lck.unique_lock_epoch);
if (lck.exclusive.pid != 0) {
bool self_exclusive = server_id_equal(&self, &lck.exclusive);
@ -849,6 +860,8 @@ static void g_lock_lock_simple_fn(
goto not_granted;
}
lck.unique_lock_epoch = generate_unique_u64(lck.unique_lock_epoch);
if (state->type == G_LOCK_WRITE) {
if (lck.num_shared != 0) {
DBG_DEBUG("num_shared=%zu\n", lck.num_shared);
@ -1023,6 +1036,8 @@ static void g_lock_unlock_fn(
}
}
lck.unique_lock_epoch = generate_unique_u64(lck.unique_lock_epoch);
state->status = g_lock_store(rec, &lck, NULL, NULL, 0);
}