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