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commit ec4595097067a736717ef202fe8542b1b4bc2dd5
Author: Timo Sirainen <timo.sirainen@open-xchange.com>
Date: Tue Aug 10 12:22:08 2021 +0300
lib-index: Fix storing cache fields' last_used with 64bit big endian CPUs
diff --git a/src/lib-index/mail-cache-fields.c b/src/lib-index/mail-cache-fields.c
index e929fb559d..429e0d234c 100644
--- a/src/lib-index/mail-cache-fields.c
+++ b/src/lib-index/mail-cache-fields.c
@@ -524,6 +524,19 @@ static void copy_to_buf_byte(struct mail_cache *cache, buffer_t *dest,
}
}
+static void
+copy_to_buf_last_used(struct mail_cache *cache, buffer_t *dest, bool add_new)
+{
+ size_t offset = offsetof(struct mail_cache_field, last_used);
+#if defined(WORDS_BIGENDIAN) && SIZEOF_VOID_P == 8
+ /* 64bit time_t with big endian CPUs: copy the last 32 bits instead of
+ the first 32 bits (that are always 0). The 32 bits are enough until
+ year 2106, so we're not in a hurry to use 64 bits on disk. */
+ offset += sizeof(uint32_t);
+#endif
+ copy_to_buf(cache, dest, add_new, offset, sizeof(uint32_t));
+}
+
static int mail_cache_header_fields_update_locked(struct mail_cache *cache)
{
buffer_t *buffer;
@@ -536,9 +549,7 @@ static int mail_cache_header_fields_update_locked(struct mail_cache *cache)
buffer = t_buffer_create(256);
- copy_to_buf(cache, buffer, FALSE,
- offsetof(struct mail_cache_field, last_used),
- sizeof(uint32_t));
+ copy_to_buf_last_used(cache, buffer, FALSE);
ret = mail_cache_write(cache, buffer->data, buffer->used,
offset + MAIL_CACHE_FIELD_LAST_USED());
if (ret == 0) {
@@ -599,9 +610,7 @@ void mail_cache_header_fields_get(struct mail_cache *cache, buffer_t *dest)
buffer_append(dest, &hdr, sizeof(hdr));
/* we have to keep the field order for the existing fields. */
- copy_to_buf(cache, dest, TRUE,
- offsetof(struct mail_cache_field, last_used),
- sizeof(uint32_t));
+ copy_to_buf_last_used(cache, dest, TRUE);
copy_to_buf(cache, dest, TRUE,
offsetof(struct mail_cache_field, field_size),
sizeof(uint32_t));
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